CN216487882U - Novel direct current contactor contact structure - Google Patents

Abstract

The utility model discloses a novel direct current contactor contact structure, which comprises: the contact piece can move relative to the static contact to be contacted with each other and form at least two contact points between the contact piece and the static contact. According to the novel direct current contactor contact structure, the contact area between the static contact and the contact piece is increased by increasing the number of the contact points of the static contact and the contact piece, the current contraction is reduced, and further the electric repulsion force borne by the contact piece is greatly reduced, so that the risk that the contactor is adhered or even explodes due to the fact that the contact piece is flicked to generate strong electric arcs when a load passes through a large short-circuit current can be effectively avoided, and the safety performance and the service life of the direct current contactor are improved; meanwhile, the contact resistance can be reduced, and the risk that the contactor fails due to the fact that the contact points are melted and adhered due to the heat generated when the large current passes through the contactor is effectively avoided.

Description

Novel direct current contactor contact structure

Technical Field

The utility model relates to the technical field of contactors, in particular to a novel direct current contactor contact structure.

Background

The direct current contactor is an electromagnetic switch for controlling the on-off of a large current through the on-off of a small current, and is mainly used in the fields of electric automobiles, charging piles, photovoltaics, energy storage and the like, and the principle of the direct current contactor is that after a coil of the contactor is electrified, the coil current generates a magnetic field, and a movable iron core is driven to act to push a contact piece to be in contact with a fixed contact, so that a circuit loop is conducted; when the coil is powered off, the movable iron core drives the contact piece to reset under the elastic force action of the spring, so that the circuit loop is disconnected.

When the contact piece and the static contact are in contact conduction in a working state of the direct current contactor, the current flows through the contact point to generate a contraction phenomenon, and the contact piece is subjected to electric repulsion under the action of an induced magnetic field generated by the contraction current, so that the movable contact piece and the static contact have a separation trend. Especially, when direct current contactor passes through great short-circuit current at the load, the contact plate can receive great electronic repulsion, when electronic repulsion is greater than the holding power of contact piece, leads to the contact plate can be bounced open, produces powerful electric arc, causes the contactor adhesion and even explodes. Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a novel direct current contactor contact structure, which realizes multi-point contact by increasing the number of contact points of a static contact and a contact piece, and achieves the purpose of reducing electric repulsion force borne by the contact piece.

The technical scheme adopted by the utility model for solving the technical problem is as follows: a novel dc contactor contact structure, comprising: the contact piece can move relative to the static contact to make mutual contact and form at least two contact points between the contact piece and the static contact.

As a further improvement of the present invention, a first groove is disposed at one end of the static contact close to the contact piece, the first groove divides the end surface of the static contact into at least two static contacts, and the static contacts form the contact points when contacting the contact piece.

As a further improvement of the present invention, the contact piece is provided with a protrusion facing the fixed contact, one end of the protrusion close to the fixed contact is provided with a second groove, the second groove divides the end surface of the protrusion into at least two movable contacts, and the movable contacts form the contact points when contacting the fixed contact on the fixed contact.

As a further improvement of the utility model, the static contact and the movable contact are both of a planar structure or a curved surface structure.

As a further improvement of the utility model, the movable contacts are arranged opposite to the fixed contacts.

As a further improvement of the utility model, the projection of the movable contact on the fixed contact can fully cover the fixed contact.

The utility model has the beneficial effects that: the utility model provides a novel direct current contactor contact structure, which increases the contact area between a static contact and a contact piece by increasing the number of contact points of the static contact and the contact piece, reduces current contraction, further greatly reduces electric repulsion force borne by the contact piece, can effectively avoid the risk of contactor adhesion and even explosion caused by strong electric arc generated by the bouncing open of the contact piece when a load passes through a large short-circuit current, and improves the safety performance and the service life of a direct current contactor; meanwhile, the contact resistance can be reduced, and the risk that the contactor fails due to the fact that the contact points are melted and adhered due to the heat generated when the large current passes through the contactor is effectively avoided.

Drawings

FIG. 1 is a perspective view of a first embodiment of the present invention;

FIG. 2 is a front view of the first embodiment of the present invention;

fig. 3 is a perspective view of a fixed contact according to an embodiment of the present invention;

fig. 4 is a bottom view of another static contact according to an embodiment of the present invention;

FIG. 5 is a perspective view of a contact plate according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a structure in which current flows through the microcontacts according to one embodiment of the present invention;

FIG. 7 is a front view of a second embodiment of the present invention;

fig. 8 is a front view of a third embodiment of the present invention.

The following description is made with reference to the accompanying drawings:

1-static contact; 101 — a first groove;

102-stationary contact; 1021-micro stationary contact;

2-contact piece; 201-projection;

202-second groove; 203-moving contact;

2031-micro-motion contact.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example one

Referring to fig. 1 to 6, the present invention provides a novel direct current contactor contact structure, including: the two static contacts 1 are symmetrically arranged and the contact piece 2 is arranged right opposite to the static contact 1, the two static contacts 1 are respectively positioned right above two ends of the contact piece 2 and are fixed on a ceramic outer shell in the direct current contactor, and the contact piece 2 is movably positioned in the ceramic outer shell and is connected with a movable iron core in the direct current contactor. A coil in the direct current contactor generates a magnetic field when being electrified, and the movable iron core is driven under the action of the magnetic field to drive the contact piece 2 to synchronously move upwards so as to enable the contact piece 2 to be in contact with the static contact 1, and further enable a working circuit loop of the direct current contactor to be conducted; when the coil is powered off, the magnetic field disappears, and the movable iron core drives the contact piece 2 to synchronously move downwards under the action of the elastic force of the spring so as to separate the contact piece 2 from the static contact 1, and further, a working circuit loop where the direct current contactor is located is disconnected.

Referring to fig. 1 to 3, the two static contacts 1 are provided with first grooves 101 on end surfaces of lower ends of the two static contacts 1 close to the contact sheet 2, the first grooves 101 are in a shape of a straight line, and the first grooves 101 divide the end surfaces of the static contacts 1 into two static contacts 102. The top end of the contact piece 2 is provided with two protrusions 201 which are opposite to the two fixed contacts 1 one by one, one ends of the two protrusions 201 close to the corresponding fixed contacts 1 are both provided with second grooves 202, the second grooves 202 are also in a shape of a Chinese character 'yi', so that the end faces, facing the fixed contacts 1, of the protrusions 201 are divided into two movable contacts 203 which are matched with the two fixed contacts 102, and the four movable contacts 203 on the contact piece 2 are opposite to the fixed contacts 102 one by one. When the contact piece 2 moves relative to the fixed contact 1 to make contact with each other, the four moving contacts 203 on the contact piece 2 are respectively contacted with the two corresponding fixed contacts 102 on the two fixed contacts 1 to form four contact points.

Referring to fig. 2 and 6, in the present embodiment, the fixed contact 102 and the movable contact 203 are both planar structures or curved surface structures matched with each other, but the contact point formed when the fixed contact 102 contacts the movable contact 203 actually consists of a microscopically infinite number of micro-contact points, that is, the micro-fixed contact 1021 existing microscopically the fixed contact 102 contacts with the micro-movable contact 2031 existing microscopically the movable contact 203. When the micro stationary contact 1021 and the micro contact 2031 are in contact, a current contraction phenomenon occurs when a current flows through the micro stationary contact 1021 and the micro contact 2031, according to the right-hand screw rule and the left-hand rule, the current line Ia indicating the current in the vertical direction does not generate an electric repulsion force on the contact 2, the component force F1 of the ampere force F in the horizontal direction generated by the current line Ib around the current line Ia and on the contact 2 in the non-vertical direction is cancelled out, and the component force F2 in the vertical direction is strengthened, so that the contact 2 is subjected to the electric repulsion force. Under static contact 1 and contact piece 2 contact pressure, this application is through increasing the contact point quantity of static contact 1 and contact piece 2, can increase area of contact between it, the microcontact point quantity increases promptly, and then reduces the current contraction, the electronic repulsion that the contact piece 2 that significantly reduces received can effectively avoid when the load through great short-circuit current contact piece 2 is bounced open and is produced powerful electric arc and cause the risk that the contactor adhesion even takes place the explosion, improve direct current contactor's security performance and life.

In addition, the number of the contact points of the static contact 1 and the contact piece 2 is increased, so that the current flowing through the static contact 1 and the contact piece 2 is shunted, and a parallel loop is formed. Under the condition that the contact pressure of the static contact 1 and the contact piece 2 is constant, the contact resistance of the parallel loop is greatly reduced compared with that of the series loop, and therefore the risk that the contactor fails due to the fact that the contact points are melted and adhered due to the heat generated when a large current passes through the contactor is effectively avoided.

Referring to fig. 4, similarly, in this embodiment, the first groove 101 may also be arranged in a cross shape, so as to divide the end surface of the static contact 1 into four fan-shaped static contacts 102, and the corresponding contact piece 2 is also provided with four movable contacts 203 matching with the four movable contacts, which can also achieve the purpose of reducing the electric repulsion force applied to the contact piece 2. In addition, the first groove 101 may be arranged in a "Y" shape or a structure where a plurality of straight lines intersect at a point, so as to increase the number of contact points more, which is not limited herein.

The projection of the movable contact 203 on the fixed contact 102 can fully cover the fixed contact 102, that is, the area of the movable contact 203 is larger than that of the fixed contact 102, so as to ensure a sufficiently large contact area and achieve reliable contact.

Example two

Referring to fig. 7, the difference between the present embodiment and the first embodiment is: the first grooves 101 are arranged on the end surfaces of the two static contacts 1 close to the lower ends of the contact pieces 2, the end surfaces of the static contacts 1 are separated by the first grooves 101 to form at least two static contacts 102, the contact pieces 2 adopt a conventional contact piece structure, and the contact points are formed when the static contacts 102 are contacted with the contact pieces 2. Through adopting this structure, can increase the contact point quantity of static contact 1 and contact piece 2 equally, reach the purpose that reduces the electronic repulsion that contact piece 2 received, avoid contact piece 2 to be opened by the bullet when the load is through great short-circuit current and produce powerful electric arc and cause the risk that the contactor adhesion even explodes, improve direct current contactor's security performance and life.

EXAMPLE III

Referring to fig. 8, the difference between the present embodiment and the first embodiment is: only two protrusions 201 which are opposite to the two static contacts 1 one by one are arranged at the top end of the contact piece 2, second grooves 202 are arranged on the two protrusions 201, the end faces, facing the static contacts 1, of the protrusions 201 are divided into at least two movable contacts 203 by the second grooves 202, the two static contacts 1 adopt a conventional static contact structure, and the contacts are formed when the movable contacts 203 are contacted with the static contacts 1. Through adopting this structure, can increase the contact point quantity of static contact 1 and contact piece 2 equally, reach the purpose that reduces the electronic repulsion that contact piece 2 received, avoid contact piece 2 to be opened by the bullet when the load is through great short-circuit current and produce powerful electric arc and cause the risk that the contactor adhesion even explodes, improve direct current contactor's security performance and life.

Therefore, according to the novel direct current contactor contact structure, the number of contact points of the static contact and the contact piece is increased, so that the contact area between the static contact and the contact piece is increased, the current contraction is reduced, and further the electric repulsion force borne by the contact piece is greatly reduced, the risk that the contactor is adhered or even explodes due to the fact that the contact piece is bounced open to generate strong electric arcs when a load passes through a large short-circuit current can be effectively avoided, the safety performance of the direct current contactor is improved, and the service life of the direct current contactor is prolonged; meanwhile, the contact resistance can be reduced, and the risk that the contactor fails due to the fact that the contact points are melted and adhered due to the heat generated when the large current passes through the contactor is effectively avoided.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the utility model, which can be embodied in many different forms than described herein, and therefore the utility model is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims (6)

1. A novel direct current contactor contact structure, its characterized in that includes: the contact piece (2) can move relative to the static contact (1) to make mutual contact and form at least two contact points between the contact piece (2) and the static contact (1).

2. The novel direct current contactor contact structure of claim 1, wherein: one end, close to the contact piece (2), of the static contact (1) is provided with a first groove (101), the end face of the static contact (1) is divided into at least two static contacts (102) by the first groove (101), and the static contacts (102) form the contact points when contacting with the contact piece (2).

3. The novel dc contactor contact structure of claim 2, wherein: the contact piece (2) is provided with a protrusion (201) opposite to the static contact (1), one end of the protrusion (201) close to the static contact (1) is provided with a second groove (202), the second groove (202) divides the end face of the protrusion (201) into at least two movable contacts (203), and the movable contacts (203) form the contact points when contacting with the static contact (102) on the static contact (1).

4. The novel direct current contactor contact structure of claim 3, wherein: the fixed contact (102) and the movable contact (203) are both of a planar structure or a curved surface structure.

5. The novel direct current contactor contact structure of claim 3, wherein: the movable contacts (203) are arranged opposite to the fixed contacts (102).

6. The novel direct current contactor contact structure of claim 3, wherein: the projection of the movable contact (203) on the fixed contact (102) can fully cover the fixed contact (102).

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