CN112413954A - Air source heat pump hot water chilling unit control method and device and air conditioning system - Google Patents
- ️Fri Feb 26 2021
Info
-
Publication number
- CN112413954A CN112413954A CN202011319488.6A CN202011319488A CN112413954A CN 112413954 A CN112413954 A CN 112413954A CN 202011319488 A CN202011319488 A CN 202011319488A CN 112413954 A CN112413954 A CN 112413954A Authority
- CN
- China Prior art keywords
- liquid level
- liquid
- level threshold
- threshold value
- economizer Prior art date
- 2020-11-23 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004378 air conditioning Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 444
- 230000009471 action Effects 0.000 claims abstract description 56
- 238000005507 spraying Methods 0.000 claims abstract description 40
- 239000003507 refrigerant Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 21
- 238000010257 thawing Methods 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 abstract description 24
- 239000007924 injection Substances 0.000 abstract description 24
- 238000012544 monitoring process Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to a control method and a device for an air source heat pump hot water chilling unit and an air conditioning system, wherein the method comprises the following steps: acquiring a liquid level value obtained by detecting the inside of a gas-liquid separator of an air source heat pump hot water chilling unit; when the liquid level value is greater than or equal to a preset liquid level threshold value, controlling a pressurizing device to perform liquid taking and air spraying actions on a gas-liquid separator; when the pressurizing device performs liquid taking and air spraying actions, redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange. By monitoring the liquid level in the gas-liquid separator, when the liquid level value is greater than or equal to the preset liquid level threshold value, the pressurizing device is controlled to perform liquid taking and air injection actions on the gas-liquid separator, so that redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot water chilling unit to complete heat exchange, the problem of liquid carrying during air suction of the compressor can be effectively solved, and stable operation of the unit is guaranteed.
Description
Technical Field
The application relates to the technical field of electrical equipment control, in particular to a control method and device for an air source heat pump hot and cold water unit and an air conditioning system.
Background
With the development of science and technology and the continuous progress of society, more and more electrical equipment appears in people's daily work and life. In the field of air conditioners, particularly ultra-low temperature air source heat pumps, air conditioning equipment needs to consider both refrigerating and heating working conditions, the unit coverage is wide in operation range, and the compressor is large in change. The maximum/minimum circulation flow rate is difficult to be considered through a conventional gas-liquid separator, and in actual operation, the problem that the compressor has air suction and liquid carrying within a certain time under extreme working conditions such as a defrosting process and large load change of the compressor is found, so that the system stability and the service life of the compressor are damaged. How to solve the problem of liquid carrying of the air suction of the compressor and ensure the stable operation of the unit is a problem to be solved urgently.
Disclosure of Invention
Therefore, the control method, the control device and the air conditioning system for the air source heat pump hot water chilling unit are needed to solve the problem that the stable operation of the unit is affected due to the fact that air suction and liquid carrying exist in a traditional unit compressor, and the technical effects that the air suction and liquid carrying problem of the compressor can be effectively solved and the stable operation of the unit can be guaranteed can be achieved.
A control method for an air source heat pump hot and cold water unit comprises the following steps:
acquiring a liquid level value obtained by detecting the inside of a gas-liquid separator of an air source heat pump hot water chilling unit;
when the liquid level value is greater than or equal to a preset liquid level threshold value, controlling a pressurizing device to perform liquid taking and air spraying actions on the gas-liquid separator; when the pressurizing device performs liquid taking and air spraying actions, redundant liquid refrigerant of the gas-liquid separator flows back to a plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange.
In one embodiment, an auxiliary control valve of the air source heat pump hot and cold water unit is connected with an electromagnetic valve, the electromagnetic valve is connected with a water side heat exchanger and a plate exchanger economizer, one end of a pressurizing device is connected with the gas-liquid separator, and the other end of the pressurizing device is connected between the auxiliary control valve and the electromagnetic valve; the control pressurization device executes liquid taking and air spraying actions on the gas-liquid separator, and comprises:
and controlling a pressurizing device to apply negative pressure to the gas-liquid separator, closing the electromagnetic valve, and reducing the opening degree of the auxiliary control valve by a preset opening degree value.
In one embodiment, after the controlling and pressurizing device applies negative pressure to the gas-liquid separator, closes the electromagnetic valve, and decreases the opening degree of the auxiliary control valve by a preset opening degree value, the method further includes:
acquiring an economizer inlet temperature and an economizer outlet temperature acquired by the plate economizer;
and adjusting the opening degree of the auxiliary path control valve according to the economizer inlet temperature and the economizer outlet temperature so that the economizer outlet temperature of the plate-type economizer is greater than or equal to the economizer inlet temperature.
In one embodiment, after adjusting the opening of the auxiliary control valve according to the economizer inlet temperature and the economizer outlet temperature to make the economizer outlet temperature of the plate economizer be greater than or equal to the economizer inlet temperature, the method further comprises:
and when the opening degree of the auxiliary path control valve reaches a preset minimum opening degree threshold value and the outlet temperature of the economizer is lower than the inlet temperature of the economizer for a continuously set time, stopping executing liquid taking and gas spraying actions on the gas-liquid separator.
In one embodiment, after the step of controlling the pressurizing device to perform liquid taking and gas spraying actions on the gas-liquid separator when the liquid level value is greater than or equal to the preset liquid level threshold value, the method further includes:
and when the liquid level value is detected to be smaller than a set liquid level threshold value, stopping executing liquid taking and air spraying actions on the gas-liquid separator.
In one embodiment, before controlling the pressurizing device to perform the liquid taking and gas spraying actions on the gas-liquid separator when the liquid level value is greater than or equal to the preset liquid level threshold value, the method further includes:
and determining a preset liquid level threshold value and a set liquid level threshold value according to the running mode of the air source heat pump hot water chilling unit and the environment temperature.
In one embodiment, the determining a preset liquid level threshold value and a set liquid level threshold value according to the operation mode of the air source heat pump hot and cold water unit and the ambient temperature includes:
when the air source heat pump hot water chilling unit is in a refrigeration mode, the first starting liquid level threshold value is used as a preset liquid level threshold value, and the first stopping liquid level threshold value is used as a set liquid level threshold value.
In one embodiment, the determining a preset liquid level threshold value and a set liquid level threshold value according to the operation mode of the air source heat pump hot and cold water unit and the ambient temperature further includes:
when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is greater than a first preset temperature threshold value, taking a first starting liquid level threshold value as a preset liquid level threshold value, and taking a first stopping liquid level threshold value as a set liquid level threshold value;
when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is greater than or equal to a second preset temperature threshold and less than or equal to a first temperature threshold, taking a second starting liquid level threshold as a preset liquid level threshold, and taking a second stopping liquid level threshold as a set liquid level threshold;
when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is lower than a second preset temperature threshold value, taking a third starting liquid level threshold value as a preset liquid level threshold value, and taking a second stopping liquid level threshold value as a set liquid level threshold value; wherein the second temperature threshold is less than the first temperature threshold, the second start level threshold is less than the first start level threshold, the third start level threshold is less than the second start level threshold, and the second stop level threshold is less than the first stop level threshold.
In one embodiment, the determining a preset liquid level threshold value and a set liquid level threshold value according to the operation mode of the air source heat pump hot and cold water unit and the ambient temperature further includes:
and when the air source heat pump hot water chilling unit is in a defrosting mode, taking the third starting liquid level threshold value as a preset liquid level threshold value, and taking the second stopping liquid level threshold value as a set liquid level threshold value.
An air source heat pump hot and cold water unit control device comprises:
the liquid level acquisition module is used for acquiring a liquid level value obtained by detecting the interior of a gas-liquid separator of the air source heat pump hot water chilling unit;
the liquid taking and air spraying module is used for controlling the pressurizing device to perform liquid taking and air spraying actions on the gas-liquid separator when the liquid level value is greater than or equal to a preset liquid level threshold value; when the pressurizing device performs liquid taking and air spraying actions, redundant liquid refrigerant of the gas-liquid separator flows back to a plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange.
An air conditioning system comprises an air source heat pump hot and cold water unit, a liquid level detection device, an economizer inlet temperature sensing bulb, an economizer outlet temperature sensing bulb and a controller, wherein the air source heat pump hot and cold water unit comprises a compressor, a four-way reversing valve, a water side heat exchanger, a plate-exchange economizer, a main path control valve, a finned tube heat exchanger, a gas-liquid separator, a pressurizing device, an electromagnetic valve and an auxiliary path control valve;
the compressor is connected with the gas-liquid separator and the plate economizer, the four-way reversing valve is connected with the compressor, the gas-liquid separator, the water side heat exchanger and the finned tube heat exchanger, the finned tube heat exchanger is connected with the main path control valve, the main path control valve is connected with the plate economizer, the plate economizer is connected with the water side heat exchanger, the auxiliary path control valve is connected with the electromagnetic valve and the plate economizer, the electromagnetic valve is connected with the water side heat exchanger, one end of the pressurizing device is connected with the gas-liquid separator, and the other end of the pressurizing device is connected between the auxiliary path control valve and the electromagnetic valve;
the liquid level detection device is arranged inside the gas-liquid separator, the economizer inlet temperature sensing bulb is arranged on the inlet side of the plate economizer, the economizer outlet temperature sensing bulb is arranged on the outlet side of the plate economizer, the controller is connected with the liquid level detection device, the economizer inlet temperature sensing bulb, the economizer outlet temperature sensing bulb, the four-way reversing valve, the main path control valve, the pressurizing device, the electromagnetic valve and the auxiliary path control valve, and the controller is used for controlling the unit according to the method.
According to the control method and device for the air source heat pump hot water chilling unit and the air conditioning system, the liquid level in the gas-liquid separator is monitored, when the liquid level value is larger than or equal to the preset liquid level threshold value, the pressurizing device is controlled to perform liquid taking and air spraying actions on the gas-liquid separator, so that redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange, the problem of air suction and liquid carrying of a compressor can be effectively solved, and stable operation of the unit is guaranteed.
Drawings
FIG. 1 is a flow chart of a control method of an air source heat pump hot and cold water unit according to an embodiment;
FIG. 2 is a flow chart illustrating an exemplary embodiment of controlling a pressurizing device to perform a liquid extraction and gas injection operation on a gas-liquid separator;
FIG. 3 is a flow chart of a control method of an air source heat pump hot water chilling unit in another embodiment;
FIG. 4 is a flow chart illustrating the determination of the preset liquid level threshold and the set liquid level threshold according to the operation mode of the air source heat pump hot and cold water unit and the ambient temperature in one embodiment;
FIG. 5 is a block diagram of a control device of an air source heat pump hot and cold water unit in one embodiment;
FIG. 6 is a schematic diagram of an embodiment of an air conditioning system;
description of reference numerals: the system comprises a 1-double-stage enthalpy spraying compressor, a 2-four-way reversing valve, a 3-water side heat exchanger, a 4-plate economizer, a 5-main-path electronic expansion valve, a 6-fin tube type heat exchanger and a fan, a 7-gas-liquid separator, an 8-pressurizing device, a 9-electromagnetic valve, a 10-auxiliary-path electronic expansion valve, an 11-economizer inlet temperature sensing bulb and a 12-economizer outlet temperature sensing bulb.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided an air source heat pump hot and cold water unit control method, including:
step S200: and acquiring a liquid level value obtained by detecting the inside of a gas-liquid separator of the air source heat pump hot water chilling unit.
Specifically, a liquid level detection device may be provided inside the gas-liquid separator, and the liquid level detection device may be connected to the controller. And in the running process of the air source heat pump water heating and cooling unit, the liquid level inside the gas-liquid separator is monitored in real time by using the liquid level detection device and fed back to the controller. Wherein, the liquid level detection device can specifically adopt a liquid level sensor, and the controller can adopt a unit controller or an independent controller.
Step S300: and when the liquid level value is greater than or equal to the preset liquid level threshold value, controlling the pressurizing device to perform liquid taking and air spraying actions on the gas-liquid separator. When the pressurizing device performs liquid taking and air spraying actions, redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange.
The specific value of the preset liquid level threshold is not unique, and the preset liquid level threshold can be a specific liquid level numerical value or a liquid level percentage value. When the liquid level in the gas-liquid separator is larger than or equal to the preset liquid level threshold value, the liquid level in the gas-liquid separator is considered to be too high, the risk of air suction and liquid carrying of a compressor of the unit exists, the controller utilizes the pressurizing device to perform liquid taking and air injection actions on the gas-liquid separator, redundant liquid refrigerants in the gas-liquid separator are ejected and discharged through the pressurizing device, and flow back to the plate exchange economizer to finish heat exchange. Specifically, the manner in which the pressurizing device performs the liquid-extracting and air-injecting operation may also vary depending on the position of the pressurizing device. For example, when the pressurizing device is installed on the upstream pipeline of the gas-liquid separator, the pressurizing device can be used for applying positive pressure to the gas-liquid separator to blow out redundant liquid refrigerant in the gas-liquid separator and return the extra liquid refrigerant to the plate economizer; when the pressurizing device is installed on a downstream pipeline of the gas-liquid separator, negative pressure can be applied to the gas-liquid separator through the pressurizing device, and redundant liquid refrigerant in the gas-liquid separator is sucked and discharged to return to the plate economizer.
In addition, when the compressor of the unit adopts a two-stage compressor, redundant liquid refrigerant in the gas-liquid separator is injected by the pressurizing device and flows back to the plate economizer to complete heat exchange, and then gaseous refrigerant coming out of the plate economizer enters a medium-pressure mixing cavity of the two-stage compressor to complete mixing and compression.
According to the control method of the air source heat pump hot water chilling unit, the liquid level in the gas-liquid separator is monitored, when the liquid level value is larger than or equal to the preset liquid level threshold value, the pressurizing device is controlled to perform liquid taking and air injection actions on the gas-liquid separator, so that redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot water chilling unit to complete heat exchange, the problem that the compressor sucks air and carries liquid can be effectively solved, and stable operation of the unit is guaranteed.
In one embodiment, an auxiliary control valve of the air source heat pump hot and cold water unit is connected with an electromagnetic valve and a plate exchanger economizer, the electromagnetic valve is connected with a water side heat exchanger, one end of a pressurizing device is connected with a gas-liquid separator, and the other end of the pressurizing device is connected between the auxiliary control valve and the electromagnetic valve. As shown in fig. 2, the step S300 of controlling the pressurizing device to perform the liquid-taking and gas-injecting operation on the gas-liquid separator includes the step S310: and controlling the pressurizing device to apply negative pressure to the gas-liquid separator, closing the electromagnetic valve, and reducing the opening degree of the auxiliary control valve by a preset opening degree value.
The value of the preset opening value is not unique and can be adjusted according to actual requirements. The preset opening value may be a specific opening numerical value or an opening percentage value, and in this embodiment, the preset opening value may be set to 20%. Specifically, when the risk of air suction and liquid carrying of the compressor is detected, liquid taking and air injection actions are executed, the pressurizing device applies negative pressure to the gas-liquid separator, the electromagnetic valve is closed, the opening degree of the auxiliary control valve is reduced by a preset opening value, redundant liquid refrigerants at the bottom of the gas-liquid separator are sprayed through the pressurizing device, and then enter the plate exchanger economizer to complete heat exchange after being throttled by the auxiliary control valve, and finally the discharged gaseous refrigerants enter a compressor medium-pressure mixing cavity to complete mixing and compression.
In one embodiment, after step S310, the step S300 of controlling the pressurizing device to perform the liquid-taking and gas-injecting actions on the gas-liquid separator further includes step S320 and step S330.
Step S320: and acquiring the economizer inlet temperature and the economizer outlet temperature acquired by the plate-changing economizer. The economizer comprises an economizer, a temperature sensing bulb, a controller and a temperature sensing bulb, wherein the economizer inlet temperature sensing bulb and the economizer outlet temperature sensing bulb can be arranged on the inlet side and the outlet side of the plate-type economizer respectively, and the economizer inlet temperature sensing bulb and the economizer outlet temperature sensing bulb are used for detecting the inlet temperature and the outlet temperature of the plate-type economizer respectively and feeding back the inlet temperature and the outlet temperature to the controller.
Step S330: and adjusting the opening degree of the auxiliary path control valve according to the economizer inlet temperature and the economizer outlet temperature so that the economizer outlet temperature of the plate-type economizer is greater than or equal to the economizer inlet temperature.
The controller adjusts the opening of the auxiliary control valve according to the actual inlet temperature and outlet temperature of the plate-type economizer, and ensures that the outlet temperature of the plate-type economizer is greater than or equal to the inlet temperature, so that the refrigerant entering the medium-pressure mixing cavity is non-liquid, and the unit is ensured to run reliably.
Further, in an embodiment, with reference to fig. 2, after step S330, the step S300 of controlling the pressurizing device to perform the liquid-taking and gas-injecting actions on the gas-liquid separator further includes step S340: and when the opening degree of the auxiliary path control valve reaches a preset minimum opening degree threshold value and the outlet temperature of the economizer is lower than the inlet temperature of the economizer for a continuously set time period, stopping executing liquid taking and gas spraying actions on the gas-liquid separator.
The specific values of the minimum opening threshold and the set duration are not unique, and the minimum opening threshold may be smaller than or equal to a preset opening value. In the present embodiment, the minimum opening threshold is set to 20%, and the set time period may be set to 30 seconds. And when the opening degree of the auxiliary control valve reaches the allowable minimum opening degree and the outlet temperature of the economizer is lower than the inlet temperature of the economizer for 30 seconds, the controller closes the pressurizing device and forcibly stops the liquid taking and gas spraying actions.
In one embodiment, as shown in fig. 3, after step S300, the method further comprises step S400: and when the detected liquid level value is smaller than the set liquid level threshold value, stopping executing liquid taking and air spraying actions on the gas-liquid separator.
The specific value of the set liquid level threshold is not unique, and the set liquid level threshold can be a specific liquid level numerical value or a liquid level percentage value. When the liquid taking and air injection actions are executed, the controller compares a liquid level value acquired in real time with a set liquid level threshold value, when the detected liquid level value is smaller than the set liquid level threshold value, the liquid level in the gas-liquid separator is considered to be lower than a risk threshold value which can cause the problem that the air suction and the liquid carrying of the compressor are caused, the controller closes the pressurizing device, the liquid taking and air injection actions of the gas-liquid separator are stopped, and the unit can operate according to normal control programs, such as the operation in modes of refrigeration, heating or defrosting.
Further, in one embodiment, with continued reference to fig. 3, prior to step S300, the method further includes step S100: and determining a preset liquid level threshold value and a set liquid level threshold value according to the running mode of the air source heat pump hot water chilling unit and the environment temperature.
Specifically, step S100 may be performed before or after step S200, or may be performed simultaneously with step S200. The controller calculates and determines a preset liquid level threshold value and a set liquid level threshold value in the current scene in real time by combining the running mode of the unit and the current environment temperature so as to be used as a basis for starting and finishing liquid taking and air spraying actions, and the control accuracy of the unit is further improved.
In one embodiment, as shown in fig. 4, step S100 includes S110: when the air source heat pump hot water chilling unit is in a refrigeration mode, the first starting liquid level threshold value is used as a preset liquid level threshold value, and the first stopping liquid level threshold value is used as a set liquid level threshold value.
And the numerical values of the first starting liquid level threshold value and the first stopping liquid level threshold value are selected and can be adjusted according to the actual condition. The controller can control the four-way reversing valve of the air source heat pump hot water chilling unit to be powered on or not powered on so as to reverse the four-way reversing valve, thereby changing the pipeline connection mode of the unit and adjusting the working mode of the unit. When the unit works in the refrigeration mode, the stored first starting liquid level threshold value is used as a preset liquid level threshold value, and the first stopping liquid level threshold value is used as a set liquid level threshold value and is used as a starting and ending judgment standard for liquid taking and air injection actions in the unit refrigeration mode.
In one embodiment, step S100 further includes step S120, step S130, and step S140.
Step S120: when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is greater than a first preset temperature threshold value, a first starting liquid level threshold value is used as a preset liquid level threshold value, and a first stopping liquid level threshold value is used as a set liquid level threshold value.
Step S130: when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is greater than or equal to a second preset temperature threshold and less than or equal to a first temperature threshold, taking the second starting liquid level threshold as a preset liquid level threshold, and taking the second stopping liquid level threshold as a set liquid level threshold.
Step S140: when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is lower than a second preset temperature threshold value, a third starting liquid level threshold value is used as a preset liquid level threshold value, and a second stopping liquid level threshold value is used as a set liquid level threshold value.
The second temperature threshold is smaller than the first temperature threshold, the second starting liquid level threshold is smaller than the first starting liquid level threshold, the third starting liquid level threshold is smaller than the second starting liquid level threshold, and the second stopping liquid level threshold is smaller than the first stopping liquid level threshold. It can be understood that the values of the first temperature threshold, the second start liquid level threshold, the third start liquid level threshold and the second stop liquid level threshold are selected and can be adjusted according to the actual situation. Taking the example that the related liquid level thresholds are all set as liquid level percentage values, in this embodiment, the first temperature threshold may be set to-5 ℃ to 5 ℃, specifically, 0 ℃. The second temperature threshold can be set to be-15 ℃ to-8 ℃, and is specifically-10 ℃. The first starting liquid level threshold value can be set to be 40% -70%, and is specifically 50%; the first stop level threshold may be set at 10%. The second starting liquid level threshold value can be set to be 20% -40%, and is specifically 30%; the second stop level threshold may be set to 0%. The third starting liquid level threshold value can be set to be 5% -20%, and is specifically 10%.
The three temperature intervals can be obtained by dividing according to the first temperature threshold and the second temperature threshold, when the unit operates in the heating mode, the controller selects the corresponding starting liquid level threshold and finishing liquid level threshold according to the detected environment temperature interval, the reliability of liquid taking and air injection actions at different temperatures is improved, and the risk of liquid carrying in air suction of the compressor is further reduced. It can be understood that in other embodiments, more temperature intervals can be divided by setting more temperature thresholds, and the start liquid level threshold and the end liquid level threshold are correspondingly set according to different temperature intervals, and are used as an operation basis for the unit to perform liquid taking and air injection actions in combination with different ambient temperatures in the heating mode.
Further, in one embodiment, with continued reference to fig. 4, step S100 further includes step S150: and when the air source heat pump hot water chilling unit is in a defrosting mode, taking the third starting liquid level threshold value as a preset liquid level threshold value, and taking the second stopping liquid level threshold value as a set liquid level threshold value.
Specifically, when the air source heat pump hot water chiller needs to perform the defrosting operation in the defrosting mode, the air source heat pump hot water chiller may perform heating and defrosting after switching to the heating mode. When the unit is in a defrosting mode, refrigerant migration change is large due to high-pressure and low-pressure switching, the risk of liquid entrainment of the compressor during air suction exists, and the controller selects the lowest liquid level threshold value as an operation standard.
In one embodiment, as shown in fig. 5, there is also provided an air source heat pump hot and cold water unit control apparatus, which includes a liquid
level collection module100 and a liquid taking and
air injecting module200.
The liquid
level acquisition module100 is used for acquiring a liquid level value obtained by detecting the interior of a gas-liquid separator of the air source heat pump hot water chilling unit; the liquid taking and
air spraying module200 is used for controlling the pressurizing device to perform liquid taking and air spraying actions on the gas-liquid separator when the liquid level value is greater than or equal to a preset liquid level threshold value; when the pressurizing device performs liquid taking and air spraying actions, redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange.
In one embodiment, an auxiliary control valve of the air source heat pump hot and cold water unit is connected with an electromagnetic valve, the electromagnetic valve is connected with a water side heat exchanger, one end of a pressurizing device is connected with a gas-liquid separator, and the other end of the pressurizing device is connected between the auxiliary control valve and the electromagnetic valve. The liquid taking and
air spraying module200 controls the pressurizing device to apply negative pressure to the gas-liquid separator, closes the electromagnetic valve, and reduces the opening degree of the auxiliary control valve by a preset opening degree value.
In one embodiment, the liquid extraction and
gas injection module200 further obtains an economizer inlet temperature and an economizer outlet temperature collected for the plate change economizer; and adjusting the opening degree of the auxiliary path control valve according to the economizer inlet temperature and the economizer outlet temperature so that the economizer outlet temperature of the plate-type economizer is greater than or equal to the economizer inlet temperature.
In one embodiment, the liquid extraction and
gas injection module200 stops the liquid extraction and gas injection action on the gas-liquid separator when the opening degree of the auxiliary control valve reaches a preset minimum opening degree threshold value and the economizer outlet temperature is lower than the economizer inlet temperature for a continuously set time period.
In one embodiment, the liquid extracting and
gas spraying module200 is further configured to stop performing the liquid extracting and gas spraying action on the gas-liquid separator when the liquid level value is detected to be smaller than the set liquid level threshold value.
In one embodiment, the liquid-extracting and air-injecting
module200 is further configured to determine a preset liquid level threshold and a set liquid level threshold according to an operation mode of the air source heat pump hot and cold water unit and an ambient temperature.
In one embodiment, when the air source heat pump hot water chiller is in the cooling mode, the liquid taking and
air injecting module200 uses the first start liquid level threshold as the preset liquid level threshold, and uses the first stop liquid level threshold as the set liquid level threshold.
In one embodiment, when the air source heat pump hot water chiller is in the heating mode, if the ambient temperature is greater than the first preset temperature threshold, the liquid taking and
air injecting module200 uses the first start liquid level threshold as the preset liquid level threshold, and uses the first stop liquid level threshold as the set liquid level threshold. When the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is greater than or equal to a second preset temperature threshold and less than or equal to a first temperature threshold, taking the second starting liquid level threshold as a preset liquid level threshold, and taking the second stopping liquid level threshold as a set liquid level threshold. When the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is lower than a second preset temperature threshold value, a third starting liquid level threshold value is used as a preset liquid level threshold value, and a second stopping liquid level threshold value is used as a set liquid level threshold value.
In one embodiment, when the air source heat pump hot water chiller is in the defrosting mode, the liquid taking and
air injecting module200 uses the third start liquid level threshold as the preset liquid level threshold, and uses the second stop liquid level threshold as the set liquid level threshold.
For specific limitations of the air source heat pump hot and cold water unit control device, reference may be made to the above limitations of the air source heat pump hot and cold water unit control method, which is not described herein again. All or part of each module in the air source heat pump hot and cold water unit control can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
According to the control device of the air source heat pump hot and cold water unit, the liquid level inside the gas-liquid separator is monitored, when the liquid level value is larger than or equal to the preset liquid level threshold value, the pressurizing device is controlled to perform liquid taking and air injection actions on the gas-liquid separator, so that redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot and cold water unit to complete heat exchange, the problem that the liquid is taken in a suction mode of a compressor can be effectively solved, and stable operation of the unit is guaranteed.
In one embodiment, an air conditioning system is further provided and comprises an air source heat pump hot and cold water unit, a liquid level detection device, an economizer inlet temperature sensing bulb, an economizer outlet temperature sensing bulb and a controller, wherein the air source heat pump hot and cold water unit comprises a compressor, a four-way reversing valve, a water side heat exchanger, a plate exchange economizer, a main path control valve, a finned tube heat exchanger, a gas-liquid separator, a pressurizing device, an electromagnetic valve and an auxiliary path control valve.
The compressor is connected with the gas-liquid separator and the plate economizer, the four-way reversing valve is connected with the compressor, the gas-liquid separator, the water side heat exchanger and the fin tube type heat exchanger, the fin tube type heat exchanger is connected with the main path control valve, the main path control valve is connected with the plate economizer, the plate economizer is connected with the water side heat exchanger, the auxiliary path control valve is connected with the electromagnetic valve and the plate economizer, the electromagnetic valve is connected with the water side heat exchanger, one end of the pressurizing device is connected with the gas-liquid separator, and the other end of the pressurizing device is connected between the auxiliary path control valve and the electromagnetic valve.
The liquid level detection device is arranged inside the gas-liquid separator, the economizer inlet temperature sensing bulb is arranged on the inlet side of the plate economizer, the economizer outlet temperature sensing bulb is arranged on the outlet side of the plate economizer, the controller is connected with the liquid level detection device, the economizer inlet temperature sensing bulb, the economizer outlet temperature sensing bulb, the four-way reversing valve, the main path control valve, the pressurizing device, the electromagnetic valve and the auxiliary path control valve, and the controller is used for controlling the unit according to the method.
The compressor can adopt a two-stage compressor, the liquid level detection device can adopt a liquid level sensor, and the main path control valve and the auxiliary path control valve can adopt electronic expansion valves, namely the main path control valve is the main path electronic expansion valve, and the auxiliary path control valve is the auxiliary path electronic expansion valve. In addition, the air conditioning system may further include an ambient temperature sensor connected to the controller. The controller can also control the on-off of the main path control valve, and can control the four-way reversing valve to obtain electricity and change the direction by not obtaining electricity, so as to adjust the working mode of the unit.
According to the air conditioning system, the liquid level in the gas-liquid separator is monitored, when the liquid level value is larger than or equal to the preset liquid level threshold value, the pressurizing device is controlled to perform liquid taking and air injection actions on the gas-liquid separator, so that redundant liquid refrigerant of the gas-liquid separator flows back to the plate exchanger economizer of the air source heat pump hot water chilling unit to complete heat exchange, the problem that the compressor sucks air and carries liquid can be effectively solved, and stable operation of the unit is guaranteed.
In order to better understand the control method, device and air conditioning system of the air source heat pump hot water unit, the following detailed explanation takes a two-stage compressor unit system as an example.
As shown in fig. 6, the two-stage compressor train system includes: the system comprises a two-stage
enthalpy injection compressor1, a four-
way reversing valve2, a water
side heat exchanger3, a plate-
exchange economizer4, a main-path
electronic expansion valve5, a fin-tube heat exchanger +
fan6, a gas-
liquid separator7, a
pressurizing device8, a
solenoid valve9, an auxiliary-path
electronic expansion valve10, an economizer inlet
temperature sensing bulb11 and an economizer outlet temperature sensing bulb 12. The double-stage compressor unit system is an air source heat pump hot water chilling unit, takes air as a heat source side and water as a heat sink side to prepare cold water and hot water so as to realize building refrigeration/heating; the compressor is a two-stage compressor and is provided with a first-stage compression cavity, a second-stage compressor cavity and a medium-pressure mixing cavity. A liquid level detection device is arranged in the gas-
liquid separator7, the tank body comprises three communicating pipes, and a pipe at the bottom is connected with the pressurizing
device8; the
electromagnetic valve9 controls the connection or the closing of the refrigerant pipeline through a control signal. The control principle of the two-stage compressor set system is as follows:
1. defining liquid taking and air spraying actions: the pressurizing
device8 acts (starts refrigerant injection), the
electromagnetic valve9 is closed, the opening degree of the auxiliary
electronic expansion valve10 is reduced by A (the value of A can be set and is generally 20%), the action enables redundant liquid refrigerant at the bottom of the gas-liquid separator to be injected through the pressurizing
device8, the redundant liquid refrigerant enters the
plate exchange economizer4 to complete heat exchange after being throttled by the auxiliary
electronic expansion valve10, and finally the discharged gaseous refrigerant enters the medium-pressure mixing cavity of the two-stage enthalpy-
injection compressor1 to complete mixing and compression.
2. In the liquid-taking and air-blowing operation, the opening degree of the bypass
electronic expansion valve10 needs to be controlled so that T is equal toEconomizer outlet temperature sensing bulb-TEconomizer inlet temperature sensing packageNot less than 0; if the opening degree of the auxiliary
electronic expansion valve10 is closed to B (the B value can be set and is generally 20 percent) of the total opening degree, and the duration is 30 seconds TEconomizer outlet temperature sensing bulb-TEconomizer inlet temperature sensing packageIf less than 0, the liquid-taking and air-spraying actions are forcibly stopped, and the liquid needs to be ensured to enter the medium-pressure mixing cavityThe refrigerant is non-liquid.
3. In the cooling mode: when the liquid level detection device of the gas-
liquid separator7 detects that the liquid level is larger than or equal to C% (the C value is 40% -70% and can be set, and 50% is generally taken), the system is considered to have the risk of liquid carrying in the compressor air suction, at the moment, the liquid taking and air injection actions are automatically judged to enter, and when the liquid level detection device of the gas-
liquid separator7 detects that the liquid level is smaller than or equal to D (the D value can be set and is generally 10% is taken), the liquid taking and air injection actions are stopped.
4. In the heating mode, if the ambient temperature is in the
interval1, the ambient temperature is more than x (the value of x can be set to be-5 ℃, generally 0 ℃), and the control action is the same as that of the
point3.
5. In the heating mode, if the environmental temperature is in the interval of 2, the x DEG C is more than or equal to the environmental temperature and more than or equal to y ℃ (the y value can be set from-15 ℃ to-8 ℃, and is generally-10 ℃): when the liquid level detection device of the gas-
liquid separator7 detects that the liquid level is more than or equal to E percent (the E value can be set from 20 percent to 40 percent, and is generally 30 percent), the liquid taking and air injection actions are automatically judged to enter, and when the liquid level detection device of the gas-
liquid separator7 detects that the liquid level is less than or equal to 0 percent, the series of liquid taking and air injection actions are stopped. The refrigerant circulation mass flow within the environment temperature range is low, the liquid level condition of liquid taking and air injection is reduced, the heating effect can be increased, and the risk of liquid carrying during air suction of the compressor is avoided.
6. In the heating mode, if the ambient temperature is in
interval3, the ambient temperature < y ℃: when the liquid level detection device of the gas-
liquid separator7 detects that the liquid level is more than or equal to F percent (the F value can be set to be 5-20 percent, generally 10 percent), the liquid-taking and air-spraying actions are automatically judged to enter, and when the liquid level detection device of the gas-
liquid separator7 detects that the liquid level is less than or equal to 0 percent, the liquid-taking and air-spraying actions are stopped. The refrigerant circulation mass flow of the environment temperature range is very low (the non-circulating redundant refrigerant is generally stored in a container of the system), liquid taking in the middle of the two-stage system becomes difficult, the enthalpy increasing effect is poor, the heating capacity and the coefficient of performance are reduced, so that the liquid level condition of liquid taking and air injection actions needs to be reduced, the heating refrigerant circulation mass flow can be increased, the heating capacity and the coefficient of performance are improved, and meanwhile, the risk that the compressor sucks air and carries liquid is avoided.
7. In the defrosting mode, the refrigerant migration change is large due to the switching of high pressure and low pressure, the risk of liquid entrainment in the compressor is existed, and the control action is the same as that of the
point6.
Above-mentioned doublestage compressor battery system realizes real-time detection compressor and breathes in and takes the liquid risk to in time handle through control system, still can realize improving the enthalpy increase effect through the middle tonifying qi volume under the improvement ultralow temperature, the heating capacity and the efficiency of ultralow temperature heating solve the poor problem of doublestage enthalpy increase system ultralow temperature tonifying qi effect.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A control method for an air source heat pump hot and cold water unit is characterized by comprising the following steps:
acquiring a liquid level value obtained by detecting the inside of a gas-liquid separator of an air source heat pump hot water chilling unit;
when the liquid level value is greater than or equal to a preset liquid level threshold value, controlling a pressurizing device to perform liquid taking and air spraying actions on the gas-liquid separator; when the pressurizing device performs liquid taking and air spraying actions, redundant liquid refrigerant of the gas-liquid separator flows back to a plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange.
2. The control method of the air source heat pump hot and cold water unit according to claim 1, characterized in that an auxiliary control valve of the air source heat pump hot and cold water unit is connected with an electromagnetic valve and a plate economizer, the electromagnetic valve is connected with a water side heat exchanger, one end of the pressurizing device is connected with the gas-liquid separator, and the other end of the pressurizing device is connected between the auxiliary control valve and the electromagnetic valve; the control pressurization device executes liquid taking and air spraying actions on the gas-liquid separator, and comprises:
and controlling a pressurizing device to apply negative pressure to the gas-liquid separator, closing the electromagnetic valve, and reducing the opening degree of the auxiliary control valve by a preset opening degree value.
3. The method for controlling the air-source heat pump hot and cold water unit according to claim 2, wherein the step of controlling the pressurizing device to apply negative pressure to the gas-liquid separator, closing the electromagnetic valve, and reducing the opening degree of the auxiliary control valve by a preset opening value further comprises the steps of:
acquiring an economizer inlet temperature and an economizer outlet temperature acquired by the plate economizer;
and adjusting the opening degree of the auxiliary path control valve according to the economizer inlet temperature and the economizer outlet temperature so that the economizer outlet temperature of the plate-type economizer is greater than or equal to the economizer inlet temperature.
4. The air-source heat pump hot and cold water unit control method according to claim 3, wherein after adjusting the opening degree of the auxiliary control valve according to the economizer inlet temperature and the economizer outlet temperature so that the economizer outlet temperature of the plate economizer is greater than or equal to the economizer inlet temperature, the method further comprises:
and when the opening degree of the auxiliary path control valve reaches a preset minimum opening degree threshold value and the outlet temperature of the economizer is lower than the inlet temperature of the economizer for a continuously set time, stopping executing liquid taking and gas spraying actions on the gas-liquid separator.
5. The control method of the air-source heat pump hot and cold water unit according to claim 1, wherein when the liquid level value is greater than or equal to a preset liquid level threshold value, after controlling the pressurizing device to perform liquid taking and gas spraying actions on the gas-liquid separator, the method further comprises:
and when the liquid level value is detected to be smaller than a set liquid level threshold value, stopping executing liquid taking and air spraying actions on the gas-liquid separator.
6. The control method of the air-source heat pump hot and cold water unit according to claim 5, wherein before controlling the pressurizing device to perform liquid taking and gas spraying actions on the gas-liquid separator when the liquid level value is greater than or equal to a preset liquid level threshold value, the method further comprises:
and determining a preset liquid level threshold value and a set liquid level threshold value according to the running mode of the air source heat pump hot water chilling unit and the environment temperature.
7. The control method of the air source heat pump hot and cold water unit according to claim 6, wherein the determining the preset liquid level threshold value and the set liquid level threshold value according to the operation mode of the air source heat pump hot and cold water unit and the ambient temperature comprises:
when the air source heat pump hot water chilling unit is in a refrigeration mode, the first starting liquid level threshold value is used as a preset liquid level threshold value, and the first stopping liquid level threshold value is used as a set liquid level threshold value.
8. The control method of the air source heat pump hot and cold water unit according to claim 7, wherein the determining of the preset liquid level threshold value and the set liquid level threshold value according to the operation mode of the air source heat pump hot and cold water unit and the ambient temperature further comprises:
when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is greater than a first preset temperature threshold value, taking a first starting liquid level threshold value as a preset liquid level threshold value, and taking a first stopping liquid level threshold value as a set liquid level threshold value;
when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is greater than or equal to a second preset temperature threshold and less than or equal to a first temperature threshold, taking a second starting liquid level threshold as a preset liquid level threshold, and taking a second stopping liquid level threshold as a set liquid level threshold;
when the air source heat pump hot water chilling unit is in a heating mode, if the ambient temperature is lower than a second preset temperature threshold value, taking a third starting liquid level threshold value as a preset liquid level threshold value, and taking a second stopping liquid level threshold value as a set liquid level threshold value; wherein the second temperature threshold is less than the first temperature threshold, the second start level threshold is less than the first start level threshold, the third start level threshold is less than the second start level threshold, and the second stop level threshold is less than the first stop level threshold.
9. The control method of the air source heat pump hot and cold water unit according to claim 8, wherein the determining of the preset liquid level threshold value and the set liquid level threshold value according to the operation mode of the air source heat pump hot and cold water unit and the ambient temperature further comprises:
and when the air source heat pump hot water chilling unit is in a defrosting mode, taking the third starting liquid level threshold value as a preset liquid level threshold value, and taking the second stopping liquid level threshold value as a set liquid level threshold value.
10. The utility model provides an air source heat pump hot and cold water unit control device which characterized in that includes:
the liquid level acquisition module is used for acquiring a liquid level value obtained by detecting the interior of a gas-liquid separator of the air source heat pump hot water chilling unit;
the liquid taking and air spraying module is used for controlling the pressurizing device to perform liquid taking and air spraying actions on the gas-liquid separator when the liquid level value is greater than or equal to a preset liquid level threshold value; when the pressurizing device performs liquid taking and air spraying actions, redundant liquid refrigerant of the gas-liquid separator flows back to a plate exchanger economizer of the air source heat pump hot water chilling unit to finish heat exchange.
11. An air conditioning system is characterized by comprising an air source heat pump hot and cold water unit, a liquid level detection device, an economizer inlet temperature sensing bulb, an economizer outlet temperature sensing bulb and a controller, wherein the air source heat pump hot and cold water unit comprises a compressor, a four-way reversing valve, a water side heat exchanger, a plate-exchange economizer, a main path control valve, a finned tube heat exchanger, a gas-liquid separator, a pressurizing device, an electromagnetic valve and an auxiliary path control valve;
the compressor is connected with the gas-liquid separator and the plate economizer, the four-way reversing valve is connected with the compressor, the gas-liquid separator, the water side heat exchanger and the finned tube heat exchanger, the finned tube heat exchanger is connected with the main path control valve, the main path control valve is connected with the plate economizer, the plate economizer is connected with the water side heat exchanger, the auxiliary path control valve is connected with the electromagnetic valve and the plate economizer, the electromagnetic valve is connected with the water side heat exchanger, one end of the pressurizing device is connected with the gas-liquid separator, and the other end of the pressurizing device is connected between the auxiliary path control valve and the electromagnetic valve;
the liquid level detection device is arranged inside the gas-liquid separator, the economizer inlet temperature sensing bulb is arranged on the inlet side of the plate economizer, the economizer outlet temperature sensing bulb is arranged on the outlet side of the plate economizer, the controller is connected with the liquid level detection device, the economizer inlet temperature sensing bulb, the economizer outlet temperature sensing bulb, the four-way reversing valve, the main path control valve, the pressurizing device, the electromagnetic valve and the auxiliary path control valve, and the controller is used for performing unit control according to the method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011319488.6A CN112413954B (en) | 2020-11-23 | 2020-11-23 | Air source heat pump hot water chilling unit control method and device and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011319488.6A CN112413954B (en) | 2020-11-23 | 2020-11-23 | Air source heat pump hot water chilling unit control method and device and air conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112413954A true CN112413954A (en) | 2021-02-26 |
| CN112413954B CN112413954B (en) | 2021-11-16 |
Family
ID=74777866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011319488.6A Active CN112413954B (en) | 2020-11-23 | 2020-11-23 | Air source heat pump hot water chilling unit control method and device and air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112413954B (en) |
Citations (18)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3600904A (en) * | 1969-05-27 | 1971-08-24 | Emerson Electric Co | Control for refrigeration system |
| US5435145A (en) * | 1994-03-03 | 1995-07-25 | General Electric Company | Refrigerant flow rate control based on liquid level in simple vapor compression refrigeration cycles |
| CN1209533A (en) * | 1997-08-22 | 1999-03-03 | 运载器有限公司 | Variable refrigerant, stage-compression heat-pump |
| JP2004309029A (en) * | 2003-04-08 | 2004-11-04 | Matsushita Electric Ind Co Ltd | Refrigerating cycle device |
| JP2009222248A (en) * | 2008-03-13 | 2009-10-01 | Aisin Seiki Co Ltd | Air conditioning system and accumulator thereof |
| CN102338522A (en) * | 2011-09-24 | 2012-02-01 | 林勇 | Self-closing and anti-liquid impact device for air-cooled heat pump air conditioner |
| CN102359738A (en) * | 2011-05-27 | 2012-02-22 | 青岛大学 | Heat pipe and refrigerating system combined energy transportation method |
| CN202631284U (en) * | 2012-06-11 | 2012-12-26 | 珠海格力电器股份有限公司 | Air conditioning system testing device |
| CN203274381U (en) * | 2013-04-22 | 2013-11-06 | 重庆美的通用制冷设备有限公司 | Gas liquid separation device, air source heat recovery system, water chilling unit and heat pump unit |
| CN203376022U (en) * | 2013-07-15 | 2014-01-01 | 广东美的暖通设备有限公司 | Device for measuring liquid level of gas-liquid separator and gas-liquid separator with same |
| CN204922204U (en) * | 2015-09-09 | 2015-12-30 | 长江大学 | Tubular column formula vapour and liquid separator level control apparatus |
| CN105674638A (en) * | 2016-01-06 | 2016-06-15 | 广东美的暖通设备有限公司 | Gas-liquid separator, air-conditioning system and control method for preventing liquid returning of compressor |
| CN106196792A (en) * | 2016-08-24 | 2016-12-07 | 珠海格力电器股份有限公司 | Accumulated liquid control method and device of gas-liquid separator and air conditioner system |
| CN106765742A (en) * | 2016-11-21 | 2017-05-31 | 珠海格力电器股份有限公司 | Air conditioning unit with flooded shell and tube heat exchanger |
| CN106766415A (en) * | 2016-12-20 | 2017-05-31 | 江苏世林博尔制冷设备有限公司 | Knockout system is set up after a kind of dry type unit evaporator |
| CN206399052U (en) * | 2016-12-20 | 2017-08-11 | 江苏世林博尔制冷设备有限公司 | Knockout system is set up after a kind of dry type unit evaporator |
| CN107477930A (en) * | 2017-08-21 | 2017-12-15 | 珠海格力电器股份有限公司 | Air conditioning system, air conditioning device, control method and control device of air conditioning device |
| CN109682134A (en) * | 2018-12-12 | 2019-04-26 | 青岛海信日立空调系统有限公司 | Gas-liquid separator and heat pump system |
-
2020
- 2020-11-23 CN CN202011319488.6A patent/CN112413954B/en active Active
Patent Citations (18)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3600904A (en) * | 1969-05-27 | 1971-08-24 | Emerson Electric Co | Control for refrigeration system |
| US5435145A (en) * | 1994-03-03 | 1995-07-25 | General Electric Company | Refrigerant flow rate control based on liquid level in simple vapor compression refrigeration cycles |
| CN1209533A (en) * | 1997-08-22 | 1999-03-03 | 运载器有限公司 | Variable refrigerant, stage-compression heat-pump |
| JP2004309029A (en) * | 2003-04-08 | 2004-11-04 | Matsushita Electric Ind Co Ltd | Refrigerating cycle device |
| JP2009222248A (en) * | 2008-03-13 | 2009-10-01 | Aisin Seiki Co Ltd | Air conditioning system and accumulator thereof |
| CN102359738A (en) * | 2011-05-27 | 2012-02-22 | 青岛大学 | Heat pipe and refrigerating system combined energy transportation method |
| CN102338522A (en) * | 2011-09-24 | 2012-02-01 | 林勇 | Self-closing and anti-liquid impact device for air-cooled heat pump air conditioner |
| CN202631284U (en) * | 2012-06-11 | 2012-12-26 | 珠海格力电器股份有限公司 | Air conditioning system testing device |
| CN203274381U (en) * | 2013-04-22 | 2013-11-06 | 重庆美的通用制冷设备有限公司 | Gas liquid separation device, air source heat recovery system, water chilling unit and heat pump unit |
| CN203376022U (en) * | 2013-07-15 | 2014-01-01 | 广东美的暖通设备有限公司 | Device for measuring liquid level of gas-liquid separator and gas-liquid separator with same |
| CN204922204U (en) * | 2015-09-09 | 2015-12-30 | 长江大学 | Tubular column formula vapour and liquid separator level control apparatus |
| CN105674638A (en) * | 2016-01-06 | 2016-06-15 | 广东美的暖通设备有限公司 | Gas-liquid separator, air-conditioning system and control method for preventing liquid returning of compressor |
| CN106196792A (en) * | 2016-08-24 | 2016-12-07 | 珠海格力电器股份有限公司 | Accumulated liquid control method and device of gas-liquid separator and air conditioner system |
| CN106765742A (en) * | 2016-11-21 | 2017-05-31 | 珠海格力电器股份有限公司 | Air conditioning unit with flooded shell and tube heat exchanger |
| CN106766415A (en) * | 2016-12-20 | 2017-05-31 | 江苏世林博尔制冷设备有限公司 | Knockout system is set up after a kind of dry type unit evaporator |
| CN206399052U (en) * | 2016-12-20 | 2017-08-11 | 江苏世林博尔制冷设备有限公司 | Knockout system is set up after a kind of dry type unit evaporator |
| CN107477930A (en) * | 2017-08-21 | 2017-12-15 | 珠海格力电器股份有限公司 | Air conditioning system, air conditioning device, control method and control device of air conditioning device |
| CN109682134A (en) * | 2018-12-12 | 2019-04-26 | 青岛海信日立空调系统有限公司 | Gas-liquid separator and heat pump system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112413954B (en) | 2021-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109282545B (en) | 2020-07-28 | Air-supplying and enthalpy-increasing control method of low-temperature direct-current variable-frequency heat pump system |
| CN105758065B (en) | 2019-04-12 | A kind of air-conditioning system method for controlling oil return |
| CN107906812B (en) | 2020-11-20 | A kind of air conditioning unit compressor cooling control method and system |
| CN109556210B (en) | 2020-11-17 | Control method of low-temperature triple heat supply pump system |
| CN110486917B (en) | 2021-06-22 | Operation control device and method, air conditioner and computer readable storage medium |
| WO2018094844A1 (en) | 2018-05-31 | Air conditioning system and control method |
| CN208635259U (en) | 2019-03-22 | A kind of refrigeration system and air-conditioning |
| CN110822545A (en) | 2020-02-21 | Inverter air conditioning system and control method for low frequency operation thereof |
| CN109253524B (en) | 2020-11-10 | Control method of heat pump system, heat pump system and air conditioner |
| CN106322768A (en) | 2017-01-11 | Water heater and control method thereof |
| CN205137703U (en) | 2016-04-06 | Air -conditioner |
| CN110762673A (en) | 2020-02-07 | Cold water air conditioning system, anti-freezing control method thereof, storage medium and computer equipment |
| CN110319541A (en) | 2019-10-11 | A kind of load out control control method of huge discharge connected machine system |
| CN112361681A (en) | 2021-02-12 | Defrosting control method and device for air-cooled heat pump cold and hot water unit and air conditioning system |
| CN111780457B (en) | 2021-11-19 | Control method for low water temperature starting of heat pump system |
| CN112413954B (en) | 2021-11-16 | Air source heat pump hot water chilling unit control method and device and air conditioning system |
| CN105546890B (en) | 2018-05-25 | Air conditioner energy output adjusting method and air-conditioning |
| CN110793151A (en) | 2020-02-14 | A multi-line refrigerant control method, device, air conditioner and storage medium |
| CN106931546B (en) | 2023-10-31 | Heat pump enthalpy-spraying system, control method thereof and air conditioner |
| CN111076350B (en) | 2021-09-21 | Control method and device for starting compressor and air conditioner |
| CN211526554U (en) | 2020-09-18 | Air conditioning system |
| CN112611070A (en) | 2021-04-06 | Air conditioner refrigerant cycle abnormity determining method and air conditioner |
| CN111397168A (en) | 2020-07-10 | Control method and device of air conditioning system, control equipment, medium and air conditioning system |
| CN111829215A (en) | 2020-10-27 | Control method for improving refrigeration energy efficiency of low-temperature heat pump unit through electromagnetic valve |
| CN111219818B (en) | 2021-09-03 | Air conditioning system, air conditioner and control method of air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 2021-02-26 | PB01 | Publication | |
| 2021-02-26 | PB01 | Publication | |
| 2021-03-16 | SE01 | Entry into force of request for substantive examination | |
| 2021-03-16 | SE01 | Entry into force of request for substantive examination | |
| 2021-11-16 | GR01 | Patent grant | |
| 2021-11-16 | GR01 | Patent grant |