CN211376543U - Moving contact of direct current contactor - Google Patents

A moving contact of a direct current contactor is characterized in that: the magnetic flux increasing device comprises a moving contact body (1), wherein the moving contact body (1) is an open groove, two ends of the open groove are respectively connected with a left contact part (2) and a right contact part (3), a first magnetic flux increasing block (4) is filled in the open groove, and a second magnetic flux increasing block (5) covers the open groove and wraps the first magnetic flux increasing block (4) in a space inner cavity formed by the open groove and the second magnetic flux increasing block (5). According to the movable contact, the magnetism increasing block is added above the movable contact body, the magnetic field distribution condition of the space is changed, and therefore the electric repulsion force of the loop is reduced. The principle that the magnetic conduction piece changes the space magnetic field and further reduces the electric repulsion force is applied, the movable contact plate is subjected to bending structure measurement to realize installation, and therefore the fusion welding resistance of the movable contact under short current resistance is improved.

Moving contact of direct current contactor

Technical Field

The utility model belongs to the technical field of direct current contactor, specifically say so and relate to a direct current contactor's moving contact.

Background

The direct current contactor is generally used on a vehicle using a storage battery as an energy source, controls a plurality of actions such as vehicle starting, speed regulation and the like, generally comprises a coil, an external magnetic circuit, an arc extinguish chamber, a static contact, a moving contact, a movable assembly, a permanent magnet, a plastic shell and the like, and is mainly used in the fields of electric automobiles, charging piles, photovoltaics, energy storage and the like. The short current resistance index is an important index of the direct current contactor, and is related to whether a product can ensure that a contact is not welded under short-time heavy current, so that subsequent normal breaking is realized. At present, the product with the highest short-time resistance index does not smoke and fire under the short-time current of 8000A-5 ms. But this kind of product structure can produce the fusion welding problem when using in electric automobile fills electric pile, reduces the electric short current-resistant index's of electric pile performance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a moving contact to above-mentioned direct current contactor's moving contact structure leads to short resistant current index performance to be difficult to the technical defect who promotes, provides a direct current contactor's moving contact, through the improvement at the moving contact structure, has improved the highest short resistant index of direct current contactor product.

Technical scheme

In order to realize the technical purpose, the utility model provides a pair of direct current contactor's moving contact, its characterized in that: the magnetic flux increasing device comprises a moving contact body, wherein the moving contact body is an open groove, two ends of the open groove are respectively connected with a left contact part and a right contact part, a first magnetic flux increasing block is filled in the open groove, and a second magnetic flux increasing block covers the open groove and wraps the first magnetic flux increasing block in a space inner cavity formed by the open groove and the second magnetic flux increasing block.

Furthermore, the open groove is U-shaped, the two side walls are correspondingly connected with the left contact part and the right contact part, and the open groove, the left contact part and the right contact part are integrally bent and formed.

Furthermore, the upper surfaces of the left contact part and the right contact part are lower than the top ends of the two side walls of the U-shaped open groove, a left silver point and a right silver point are correspondingly arranged on the left contact part and the right contact part, and the upper surfaces of the left silver point and the right silver point are equal in height with the top ends of the two side walls of the U-shaped open groove.

Furthermore, the first magnetism increasing block is in a square shape, and the second magnetism increasing block is in a U shape.

Furthermore, inclined plane clamping tables are arranged on two sides of the bottom of the opening groove, and inclined plane notches corresponding to the inclined plane clamping tables are arranged on two side arms of the U-shaped magnetizing block II.

Furthermore, one end of a pushing shaft penetrates through the bottom of the opening groove, a first magnetism increasing block and a second magnetism increasing block are limited by a clamp spring, one end of a contact spring is sleeved on the pushing shaft and abuts against the bottom of the opening groove, and the other end of the contact spring abuts against the driving unit.

Advantageous effects

The utility model provides a pair of direct current contactor's moving contact, to the electronic repulsion in return circuit that Lorenz power brought among the prior art, through add the magnetism-increasing piece above the moving contact body, change the magnetic field distribution condition in space to reduce the electronic repulsion in return circuit. The principle that the magnetic conduction piece changes the space magnetic field and further reduces the electric repulsion force is applied, the movable contact plate is subjected to bending structure measurement to realize installation, and therefore the fusion welding resistance of the movable contact under short current resistance is improved.

Drawings

Fig. 1 is a schematic perspective view of a moving contact and a static contact in an embodiment of the present invention.

Fig. 2 is a schematic view of the moving and static contacts in the embodiment of the present invention.

Fig. 3 is a schematic view of the position of the moving contact body, the left contact portion and the right contact portion in the embodiment of the present invention.

Fig. 4 is an exploded view of a contact system according to an embodiment of the invention.

Fig. 5 is a perspective view of the moving contact assembly in the embodiment of the present invention.

Fig. 6 is a schematic view of the magnetic field in the embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Examples

The first magnetism increasing block 4 is in a square block shape, and the second magnetism increasing block 5 is in a U shape.

As shown in fig. 6, the magnetic field distribution in the space is changed by adding the magnetism increasing block above the moving contact plate, so that the lorentz force in the electric repulsive force is reduced. The principle that the magnetic conduction piece changes the space magnetic field and further reduces the electric repulsion force is applied, the movable contact plate is changed from an original flat plate structure to a bent structure, so that the space for installing the magnetism increasing block is reserved above the movable contact plate on the premise that the original appearance size is not changed, and meanwhile, the simple fixed installation form is realized by utilizing the characteristics of the small boss. Meanwhile, silver points are welded on the movable contact plate, and the fusion welding resistance of the movable contact and the fixed contact is optimized by reducing the resistance between the contact surfaces of the movable contact and the fixed contact.

The structure, ratio, size and the like shown in the drawings attached to the present embodiment are only used for matching with the disclosure of the specification, so as to be known and read by those skilled in the art, and are not used to limit the practical limit condition of the present invention, so that the present invention does not have the essential meaning in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered to be the scope of the present invention without substantial changes in the technical content.