CN111111342A - Filter assembly and filter screen filth blockage detection method - Google Patents

The invention provides a filter assembly and a filter screen filth blockage detection method, wherein the filter assembly is arranged in an air duct of air treatment equipment and comprises the following components: a filter screen; the air inducing fan is at least partially opposite to the filter screen; the current sensor is connected with the induced draft fan and used for detecting the current of the induced draft fan, whether the filter screen needs to be cleaned or not is determined by conveying the current detected by the current sensor, and the problem of low universality of dirty and blocked detection of the filter screen in the prior art is solved.

Filter assembly and filter screen filth blockage detection method

Technical Field

The invention relates to the field of air filtration, in particular to a filter assembly and a filter screen filth blockage detection method.

Background

People spend about 90% of the time indoors, and the indoor air quality affects not only the comfort and health of human bodies, but also the working efficiency of indoor personnel. However, poor indoor air quality is caused by building materials, home materials, outdoor air pollution, smoking of indoor people, and the like.

For this reason, there is an increasing tendency to purify indoor air using a range of air treatment devices. Such as air purifiers, fresh air blowers, household air conditioners, etc., while the use of screens to filter indoor contaminants is the most common means for these air treatment devices. After the filter screen live time had been long, the pollutant deposit caused the filter screen filth stifled, not only can influence air treatment equipment's the amount of wind, influence the air treatment effect, still can cause air secondary pollution, so the filter screen need wash or change after using a period, how accurately judge whether filth is stifled to the filter screen to in reminding the user to change or wash the filter screen, became an industry difficult problem.

The existing method for reminding a user to replace a filter screen mainly comprises the following steps: noting the filter screen replacement frequency in the air treatment equipment or reminding filter screen replacement or cleaning according to the accumulated running time; for users who have low actual use frequency, the filter screen does not reach the cleaning degree actually; the air pollution degree of each area of the land is different in China, so that the accumulated dust amount of the filter screen is different in the same time, and the filter screen is replaced or cleaned by the method, so that the equipment maintenance cost of a user is increased, and the time of the user is wasted.

Disclosure of Invention

The invention mainly aims to provide a filter assembly and a filter screen filth blockage detection method, and aims to solve the problem that filter screen filth blockage detection in the prior art is low in universality.

In order to achieve the above object, according to one aspect of the present invention, there is provided a filter assembly installed in a duct of an air treatment apparatus, the filter assembly including: a filter screen; the air inducing fan is at least partially opposite to the filter screen; and the current sensor is connected with the induced draft fan and used for detecting the current of the induced draft fan so as to determine whether the filter screen needs to be cleaned or not by conveying the current detected by the current sensor.

Furthermore, the filter screen has first terminal surface and second terminal surface, and the first terminal surface of filter screen is relative with induced air fan, and the second terminal surface of filter screen is relative with the air intake in wind channel.

Further, the filter assembly further comprises: the first pressure sensor is arranged on a first end surface of the filter screen, and the first end surface is opposite to the induced draft fan; and the second pressure sensor is arranged on the second end surface of the filter screen, and the second end surface is opposite to the air inlet of the air duct.

Further, the filter assembly further comprises: and the flow sensor is arranged on the inner wall of the air channel and used for detecting the flow of the air flow in the air channel.

Further, flow sensor sets up between the air outlet in filter screen and wind channel.

According to another aspect of the present invention, there is provided a method for detecting filth blockage of a filter screen, which is suitable for the filter assembly, the method comprising the steps of: setting a preset current value of an induced draft fan; detecting the current of the induced draft fan, and comparing the detected current value with a preset current value set in a current value control system; and when the detected current value is larger than or equal to the preset current value, cleaning the filter screen.

Further, the filter assembly is the above filter assembly, and the method for obtaining the preset current value includes: controlling an induced draft fan to operate at a preset rotating speed, and detecting the airflow flow of an air outlet, wherein the airflow flow of the air outlet is the initial flow at the moment; gradually adding experimental dust to the filter screen, detecting the detection flow of the air port, and detecting the flow of the induced draft fan when the detection flow reaches a preset flow value; at this time, the flow of the induced draft fan is a preset current value.

Further, the predetermined flow value is 20% to 50% of the initial flow value.

Further, the filter assembly is the above filter assembly, and the method for obtaining the preset current value includes: controlling an induced draft fan to operate at a preset rotating speed; detecting air pressure values at two sides of the filter screen, and obtaining a first pressure difference value at two sides of the filter screen; gradually adding experimental dust to the filter screen, detecting the pressure difference of two sides of the filter screen, detecting the flow of the induced draft fan when the pressure difference of the two sides of the filter screen is a second pressure difference value, and at the moment, detecting the flow of the induced draft fan to be a preset current value.

Further, the second differential pressure value is 3 to 7 times the first differential pressure value.

By applying the technical scheme of the invention, the filter assembly is arranged in an air duct of the air treatment equipment, wherein the filter assembly comprises a filter screen, an induced draft fan and a current sensor, and at least part of the induced draft fan is opposite to the filter screen; the flow sensor is connected with the induced draft fan and used for detecting the current of the induced draft fan so as to determine whether the filter screen needs to be cleaned or not by conveying the current detected by the current sensor. Whether the filter screen needs to be cleaned or not is judged by detecting the current of the induced draft fan, so that the condition for judging whether the filter screen needs to be cleaned or not is not influenced by external environmental factors and objective conditions, the filter assembly provided by the invention is suitable for any condition, whether the filter screen needs to be cleaned or not can be accurately judged, and the general performance of the filter assembly is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic structural view of an embodiment of a filter assembly according to the present invention;

fig. 2 shows a program flow diagram of a filter screen filth blockage detection method according to the present invention;

fig. 3 shows a functional relationship diagram of the flow of the induced air fan and the dust holding capacity of the filter screen according to the filter screen filth blockage detection method of the invention.

Wherein the figures include the following reference numerals:

1. an air duct; 2. a filter screen; 3. an induced draft fan; 4. a first pressure sensor; 5. a second pressure sensor; 6. a flow sensor.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the current sensor is a detection device, which can sense information of the current to be sensed, and can convert the sensed information into an electrical signal meeting certain standards or other information in a required form according to a certain rule for output, so as to meet the requirements of information transmission, processing, storage, display, recording, control, and the like.

As shown in fig. 2, the air treatment device is started to operate, the operating parameters of the induced draft fan are detected, the current value of the induced draft fan is obtained, and when the obtained current value is greater than or equal to a preset current value, the alarm device gives an alarm to remind a user to clean or replace the filter screen; and when the acquired current value is smaller than the preset current value, continuously detecting the current value of the induced draft fan.

Preferably, the predetermined flow value is 20% to 50% of the initial flow value.

Preferably, the second differential pressure value is 3 to 7 times the first differential pressure value.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.