CN216562799U

CN216562799U - Contact system and switch of switch

Info

Publication number: CN216562799U
Application number: CN202122287903.0U
Authority: CN
Inventors: 刘万里; 戴明军; 南寅; 韦丹; 南添; 邹海洋; 穆志佳
Original assignee: Tianjin Svrui Intelligent Electrical Co Ltd
Current assignee: Tianjin Svrui Intelligent Electrical Co Ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-05-17
Anticipated expiration: 2031-09-22

Abstract

The utility model provides a contact system of a switch, which comprises a moving contact and a static contact chuck, wherein the moving contact is inserted into or pulled out of the static contact chuck to realize the connection or disconnection of the switch, the static contact chuck comprises a clamping part for providing clamping force for the moving contact, a first conductor and a second conductor which have opposite current flow directions are arranged on two sides of the clamping part, the current flow directions of the first conductors on the two sides are the same and are arranged adjacently, the first conductor and the second conductor on the same side are movably arranged relatively, and the switch comprises the contact system.

Description

Contact system and switch of switch

Technical Field

The utility model relates to the technical field of electric appliances, in particular to a contact system of a switch and the switch.

Background

The switch can cut off and connect a load circuit, and the safe operation of the whole power utilization system is ensured. With the increase of power level, new technologies and new technologies are continuously emerging, the performance of the switching device is becoming more and more severe, and in some special use occasions, the switching device is required to have good short-time tolerance capability, that is, the switching device is required to be capable of bearing short-circuit current for a period of time, so as to ensure the reliability and continuity of power supply.

In a high voltage dc energy storage system, when a fault current, such as a short circuit current, passes through a main circuit of a switching device, a large electrodynamic repulsive force is generated between a moving contact and a stationary contact. If there is not enough pressure between the contacts, the contacts will be repelled apart under the action of electric repulsion force, an electric arc will be generated between the contacts, the existence of the electric arc will seriously ablate the contacts, even cause fusion welding, and cause permanent damage to the switch, resulting in failure of opening and closing, meanwhile, in a high-voltage direct current system, the electric arc generated by opening and closing the switch is difficult to extinguish, and how to ensure reliable opening and closing while improving short-time endurance is a big difficulty in the industry.

SUMMERY OF THE UTILITY MODEL

Based on the above background, the static contact chuck provided by the present invention can provide multiple clamping forces for the moving contact by the static contact chuck through the attraction of the two inner side conductors in the same direction and the repulsion of the two conductors on one side in the opposite direction, so as to prevent the moving contact from repelling from the static contact chuck when a large current passes through the static contact chuck, and effectively overcome at least one of the above problems.

The technical scheme of the utility model is as follows:

on one hand, the utility model provides a contact system of a switch, which comprises a moving contact and a static contact chuck, wherein the moving contact is inserted into or pulled out of the static contact chuck to realize the connection or disconnection of the switch, the static contact chuck comprises a clamping part for providing clamping force for the moving contact, a first conductor and a second conductor which have opposite current flow directions are arranged on two sides of the clamping part, the current flow directions of the first conductors on the two sides are the same and are arranged adjacently, and the first conductor and the second conductor on the same side are arranged in a relatively movable manner.

Further, the first conductor and the second conductor on the same side are connected through a flexible electric conductor.

Further, the first conductor or/and the second conductor are welded, crimped, screwed or riveted with the flexible electrical conductor; or the first conductor, the flexible conductive piece and the second conductor are integrally formed.

Furthermore, the first conductor and the second conductor on the same side are connected in a rotating mode around the same rotating center.

Furthermore, a stationary contact is arranged on the inner side surface of the first conductor, and the stationary contact is made of copper-tungsten alloy, silver-tungsten alloy or silver-nickel alloy.

On the other hand, the utility model also provides an electric switch which comprises the contact system, the insulating shell, the operating mechanism, the release, a wire inlet end and a wire outlet end, wherein the wire inlet end is connected with the static contact chuck, and the wire outlet end is connected with the movable contact.

Furthermore, the insulation shell is provided with a limiting part for limiting the rotation angle of the first conductor.

Furthermore, the limiting part comprises a first limiting part arranged between the first conductors on two sides and a second limiting part arranged between the first conductors and the second conductors on the same side.

Further, the switch comprises a support, the support is fixedly arranged in the insulating shell or integrally arranged with the insulating shell, and the first limiting part is arranged on the support.

Further, the switch includes a bracket to which the first conductor is pivotally connected.

Further, the switch further comprises an elastic member for providing the first conductor with an elastic force required for the inward movement.

Further, the switch comprises a support, the elastic piece is sleeved on the support, one end of the elastic piece is abutted on the support, and the other end of the elastic piece is abutted on the first conductor.

The utility model has the following beneficial effects:

1. the first conductor current flow direction of static contact chuck both sides is the same, what produce between the two is electromagnetic suction, the first conductor of both sides presss from both sides the moving contact tightly, it is opposite that the current flow direction is between the first conductor that lies in static contact chuck same side and the second conductor, produce electronic repulsion between first conductor and the second conductor, make the first conductor further compress tightly the moving contact, the moving contact receives the inward packing force of elasticity and first conductor of elastic component at the closed position, dual clamp force guarantees the moving contact, when the static contact chuck passes through at heavy current, can not be repelled between the contact, the short-term endurance capacity of switch has been promoted by a wide margin.

2. When the moving contact is switched on, the bounce between the moving contact and the static contact chuck can be avoided, the ablation caused by the bounce of the contact is avoided, and the electric service life and the mechanical service life are greatly prolonged.

3. The static contact chuck provides multiple clamp force for the moving contact, guarantees that the moving contact and static contact chuck reliably contact, and contact resistance diminishes, and the temperature rise is low.

4. The moving contact and the static contact chuck rub each other in the process of inserting/extracting the static contact chuck, so that dust and oxides of a contact panel can be cleaned, the surface flatness and the contact area of the contacts are further improved, the reliable contact between the contacts is ensured, and good contact resistance and temperature rise are kept.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of a contact system provided by the present invention;

FIG. 2 is a schematic view of a portion of a contact system provided by the present invention;

FIG. 3 is a schematic view of the static chuck current direction and electromotive force provided by the present invention;

FIG. 4 is a schematic diagram of a portion of a switch according to the present invention;

fig. 5 is a schematic structural view of a contact system according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For convenience of description, the directions of up, down, left and right will hereinafter be referred to based on the orientation shown in the drawings, and it is not intended that the referred devices or elements have a specific orientation, and thus, they should not be construed as limiting the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention provides a contact system of a switch, including a moving contact 1 and a static contact 2, the moving contact 1 goes in and out or is pulled out of the static contact chuck 2 to realize the connection or disconnection of the switch, the static contact chuck comprises a clamping part for providing clamping force for the moving contact 1, a first conductor 21 and a second conductor 22 with opposite current flow directions are arranged on two sides of the clamping part, the current flow directions of the first conductors 21 on the two sides are the same and are arranged adjacently, the moving contact 1 is inserted into or pulled out of the space between the first conductors 21 on the two adjacent sides, since the current flow directions of the first conductors 21 on both sides are the same, in this embodiment, the current flows from the second conductor 22 to the first conductor 21, the current flow directions of the second conductors 21 on both sides are both downward, and the current flow directions are the same, so that an electromagnetic attraction force is generated between the two conductors, and a clamping force is provided for clamping the movable contact.

The current flow directions of the first conductor 21 and the second conductor 22 on the same side are opposite, and the current flow directions of the first conductor 21 and the second conductor 22 are opposite, so that a repulsive force is generated between the first conductor 21 and the second conductor 22 on the same side, and the first conductor 21 further presses the movable contact 1.

Specifically, as shown in fig. 3, when a large current flows through the main switch loop, the current enters the main switch loop along the incoming line end of the switch, the current I1 flowing through the left second conductor 22 and the current I2 flowing through the left first conductor 21 are opposite in direction, a repulsive force is generated between the left first conductor 21 and the left second conductor 22, and the left second conductor 22 generates a repulsive force F1 to the left first conductor 21; the current I3 flowing through the right first conductor 21 and the current I4 flowing through the right second conductor 22 are opposite in direction, so that a repulsive force is generated between the right first conductor 21 and the right second conductor 22, and the right second conductor 22 generates a repulsive force F2 to the right first conductor 21; since the current I2 flowing through the left first conductor 21 and the current I3 flowing through the right first conductor 21 have the same current flow direction, the electromagnetic attraction forces F3 and F4 are generated between the left and right first conductors 21, and F1, F2, F3 and F4 are all the clamping forces provided by the first conductor 21 for the movable contact 1.

With reference to fig. 2, the first conductor 21 and the second conductor 22 are connected by a flexible conductor 212, the flexible conductor 212 includes but is not limited to a flexible connection line, a flexible braided line, and a foil, and may be any other flexible structure capable of conducting electricity, and the first conductor 21 and the second conductor 22 are connected by a flexible conductor, so that resistance force applied when the first conductor 21 and the second conductor 22 repel each other can be reduced, and it is ensured that the repulsive force between the first conductor 21 and the second conductor 22 is not reduced.

The clamping surface of the first conductor 21 is a side surface of the first conductor 21 on two sides opposite to each other, in this embodiment, a stationary contact 215 is disposed on the clamping surface, and the stationary contact 215 is made of copper-tungsten alloy, silver-tungsten alloy, or silver-nickel alloy.

This embodiment still provides an electric switch, the switch includes foretell contact system, insulating casing, operating device, release, inlet wire end and outlet terminal, insulating casing is including being used for holding the cavity of contact system, operating device, release, contact system, operating device, release all are located the cavity, wherein, the static contact chuck 2 of contact system with the inlet wire end is connected, the moving contact 1 of contact system with the outlet terminal is connected.

As shown in fig. 4, a bracket 3 is further fixedly disposed in the insulating housing, the first conductor 21 is pivotally connected to the bracket 3 through a rotating shaft 211, the bracket 3 includes a first position-limiting portion 213 extending between the first conductors 21 on both sides, the first position-limiting portion 213 is made of an insulating material, the width of the first position-limiting portion 213 in the left-right direction is smaller than the thickness of the movable contact 1 in the left-right direction, the support 3 is sleeved with an elastic member 214, one end of the elastic member 214 abuts against the support 3, the other end abuts against the first conductor 21, the elastic member 214 provides the first conductor 21 with an elastic force always having a tendency to move inward, when the moving contact 1 is pulled out of the static contact chuck 2, the first conductors 21 on both sides are abutted against both side walls of the first limiting portion 213 under the elastic force of the elastic member 214.

With reference to fig. 3, when the movable contact 1 is inserted into the static contact chuck 2, the first conductors 21 on the left and right sides are separated from the first limiting portion 213, the elastic force F5 and F6 provided by the elastic member 214 for the first conductors 21, the electromagnetic attraction force F1 and F2 between the first conductors 21 on the two sides, and the electric repulsion force F3 and F4 between the first conductors 21 and the second conductors 22 enable the first conductors 21 on the two sides to clamp the movable contact, so that the movable contact and the static contact chuck are not repelled when a large current passes through the movable contact and the static contact chuck, and the short-time endurance of the switch is greatly improved.

The elastic member 214 in this embodiment is a torsion spring, and in other embodiments, the elastic member may also be a compression spring, and the compression spring may be disposed between the first conductor 21 and the second conductor 22, and always provides a pushing force for the first conductor 21 with a tendency to move inward.

The switch further comprises a second limiting part 216 arranged between the first conductor 21 and the second conductor 22 on the same side, the second limiting part 216 is arranged between the lower parts of the first conductor 21 and the second conductor 22, the second limiting part 216 is made of insulating materials and prevents the first conductor 21 and the second conductor 22 from conducting electricity between the parts below the flexible conductor 212, and the second limiting part 216 is fixedly arranged on the insulating shell or is integrally arranged with the insulating shell.

In other embodiments, as shown in fig. 5, the second conductor 22 is also pivotally connected to the bracket through a rotating shaft 211, the first conductor 21 and the second conductor 22 are rotatably connected around the same rotating shaft 211, the rotating shaft 211 extends in the front-rear direction, the first conductor 21 can swing left and right around the rotating shaft, and a repulsive force generated between the first conductor 21 and the second conductor 22 can push the first conductor to rotate inward around the rotating shaft 211, so as to increase the clamping force of the first conductor 21 on the movable contact 1.

The present application may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A contact system of switch, includes moving contact and static contact chuck, the moving contact inserts or extracts the static contact chuck is in order to realize the switch-on or disconnection of switch, the static contact chuck includes for the moving contact provides the clamping part of clamp force, its characterized in that: the clamping part is provided with a first conductor and a second conductor which have opposite current flow directions, the current flow directions of the first conductors on the two sides are the same and are arranged adjacently, and the first conductors on the same side and the second conductors are arranged movably relatively.

2. The contact system of claim 1, wherein: the first conductor and the second conductor on the same side are connected through a flexible conductor.

3. The contact system of claim 2, wherein: the first conductor or/and the second conductor are/is welded, crimped, screwed or riveted with the flexible conductor; or the first conductor, the flexible conductive piece and the second conductor are integrally formed.

4. The contact system of claim 1, wherein: the first conductor and the second conductor on the same side are connected in a rotating mode around the same rotating center.

5. The contact system according to claim 1, wherein a stationary contact is disposed on an inner side of the first conductor, and the stationary contact is made of copper-tungsten alloy, silver-tungsten alloy or silver-nickel alloy.

6. An electrical switch comprising a contact system according to any one of claims 1 to 5, an insulating housing, an operating mechanism, a trip device, a line inlet and a line outlet, the line inlet being connected to the static contact head and the line outlet being connected to the movable contact.

7. The switch of claim 6, wherein: the switch is provided with a limiting part for limiting the rotation angle of the first conductor.

8. The switch of claim 7, wherein: the limiting part comprises a first limiting part arranged between the first conductors on two sides and a second limiting part arranged between the first conductors and the second conductors on the same side.

9. The switch of claim 8, wherein: the switch comprises a support, the support is fixedly arranged in the insulating shell or integrally arranged with the insulating shell, and the first limiting part is arranged on the support.

10. The switch of claim 6, wherein: the switch includes a bracket to which the first conductor is pivotally connected.

11. The switch of claim 6, wherein: the switch further includes an elastic member that provides the first conductor with an elastic force required for the inward movement.

12. The switch of claim 11, wherein: the switch comprises a support, the elastic piece is sleeved on the support, one end of the elastic piece is abutted on the support, and the other end of the elastic piece is abutted on the first conductor.