Auxiliary switch with high breaking capacity

Abstract

The utility model discloses an auxiliary switch with high breaking capacity, which comprises a front mounting plate and a rear mounting plate, a plurality of contact box assemblies are overlapped between the front mounting plate and the rear mounting plate, the front mounting plate, the plurality of contact box assemblies and the rear mounting plate are sequentially connected and fixed in a penetrating manner through pull rods, each contact box assembly comprises a box body, a cam is arranged in the middle of each box body, a hole is formed in the center of each cam, and the contact box assemblies are arranged in the holes. Holes of cams of the contact box assemblies are connected in a penetrating mode through a rotating shaft, the two sides of the cams abut against moving contact sliding blocks respectively, the front ends of the moving contact sliding blocks abut against the peripheries of the cams, the rear ends of the moving contact sliding blocks are connected with moving contact pieces, moving contacts are arranged at the ends of one sides of the moving contact pieces, and the other sides of the moving contact pieces are connected with the inner wall of the box body through springs. A static contact corresponding to the moving contact is arranged at the end of the static contact piece, a magnet block is arranged between the static contact piece and the bottom of the box body, and the magnetic field directions of the magnet blocks in any two adjacent contact box assemblies are opposite. According to the invention, magnetic quenching can be accelerated, the breaking capacity of the switch is improved, and assembly is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary switches, in particular to an auxiliary switch with high breaking capacity. Background Art

[0002] As a very important part of the auxiliary and control circuits of high-voltage switchgear, auxiliary switches are configured in power equipment such as high-voltage or medium-voltage circuit breakers and disconnectors, installed inside the operating mechanism box, and used for the opening, closing, signal control, and interlocking protection of the secondary control circuit. At the same time, they can also be used as combination switches and transfer switches. They are widely used in industries such as electric power, industrial automation, and process automation.

[0003] The main structure of the existing auxiliary switch is that the upper and lower layers of the switch contact box are stacked together, and the compression states of the contact springs in each layer are different, resulting in inconvenient assembly and low efficiency. In addition, the existing auxiliary switch has a low breaking capacity for DC loads. Especially in a DC load circuit with a high inductance component, the arc burning time is long, the arc extinguishing is difficult, the contact ablation is serious, the erosion of the arc on the insulating material is strong, and the life of the switch is low. Summary of the Invention

[0004] In view of the existing problems, the utility model provides an auxiliary switch with a simple structure and high breaking capacity.

[0005] To achieve the above object, the utility model provides the following solution: An auxiliary switch with high breaking capacity includes a front mounting plate and a rear mounting plate. A plurality of contact box assemblies are stacked between the front mounting plate and the rear mounting plate. The front mounting plate, the plurality of contact box assemblies, and the rear mounting plate are sequentially fixed by passing through a pull rod. The contact box assembly includes a box body. A cam is provided in the middle of the box body. A hole is opened in the center of the cam, and the hole is a non-circular hole. The holes of the cams of the plurality of contact box assemblies are connected by a rotating shaft that matches the hole. On both sides of the cam, there are respectively abutted moving contact sliders with an arc-shaped structure at the front end. The front end of the moving contact slider abuts against the outer circumference of the cam, and the rear end is connected with a moving contact piece. One end of one side of the moving contact piece is provided with a moving contact, and the other side is connected to the inner wall of the box body by a spring. A static contact piece is fixed in the box body by a screw. The end of the static contact piece is provided with a static contact corresponding to the moving contact. A magnet block is fixedly arranged between the static contact piece and the bottom of the box body. The N and S poles of the magnet block are on the same straight line as the stacking direction of the plurality of contact box assemblies, and the magnetic field directions of the magnet blocks in any two adjacent contact box assemblies are opposite.

[0006] Further, a limiting support block is arranged on the lower side of the arc-shaped structure at the front end of the moving contact slider, and the cam presses on the limiting support block.

[0007] Further, the rear end of the moving contact slider is set as a U-shaped groove, and the moving contact piece is fixedly connected in the U-shaped groove.

[0008] Further, support arms are arranged on both sides of the moving contact slider towards the direction of the moving contact, and the moving contact piece is fixedly connected to the support arms.

[0009] Further, the hole is a square hole or a pentagonal hole.

[0010] Further, a chute is arranged inside the box body, the moving contact slider is arranged in the chute, and the moving contact slider slides along the chute.

[0011] The beneficial effects of the present utility model are as follows: By arranging a magnet block between the static contact piece and the bottom of the box body, the N and S poles of the magnet block are on the same straight line as the superposition direction of multiple contact boxes, and the magnetic field directions of the magnet blocks in any two adjacent contact box assemblies are opposite. The magnetic fields generated by the four magnet blocks in each contact box accelerate magnetic blowout arc extinguishing, which can improve the breaking capacity of the switch. In addition, by pressing the cam on the limit support block at the front end of the moving contact slider, tilting can be prevented, which is convenient for installation. The support arms arranged on both sides of the moving contact slider are beneficial to preventing the moving contact piece from bending due to force or temperature change, resulting in the failure of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the present utility model;

[0013] Figure 2 is a schematic diagram of the structure of the contact box assembly;

[0014] Figure 3 is a schematic diagram of the structure of the moving contact slider.

[0015] Reference numerals: front mounting plate 1; rear mounting plate 2; contact box assembly 3; pull rod 4; box body 5; cam 6; hole 7; rotating shaft 8; moving contact slider 9; moving contact piece 10; moving contact 11; spring 12; screw 13; static contact piece 14; static contact 15; magnet block 16; limit support block 17; U-shaped groove 18; support arm 19; chute 20. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] As Figure 1 shown, an auxiliary switch with a high breaking capacity includes a front mounting plate 1 and a rear mounting plate 2. A plurality of contact box assemblies 3 are superimposed between the front mounting plate 1 and the rear mounting plate 2. A pull rod 4 sequentially passes through the front mounting plate 1, the plurality of contact box assemblies 3 and the rear mounting plate 2. Nuts are screwed at both ends of the pull rod to abut against the front mounting plate 1 and the rear mounting plate 2. The front mounting plate 1 and the rear mounting plate 2 are connected by the nuts, so that the front mounting plate 1, the plurality of contact box assemblies 3 and the rear mounting plate 2 are connected into a switch body.

[0017] As Figure 2As shown in the figure, the contact box assembly 3 includes a box body 5. A cam 6 is provided at the central position of the box body 5. A hole 7 is provided at the center of the cam 6. The hole 7 is a non-circular hole, such as a square hole or a pentagonal hole, etc. A rotating shaft 8 adapted to the hole 7 is sequentially inserted through the holes 7 of the cams 6 of multiple contact box assemblies 3. Moving contact sliders 9 are respectively abutted on both sides of the cam 6. The front end of the moving contact slider 9 is an arc structure. The front end of the moving contact slider 9 abuts on the outer end of the cam 6. The rear end of the moving contact slider 9 is connected to a moving contact piece 10. Moving contacts 11 are provided at both ends of the side of the moving contact piece 10 facing the cam 6. The two ends of the other side of the moving contact piece 10 are connected to the inner wall of the box body 5 through springs 12. A static contact piece 13 is fixedly connected to the box body 5 through a screw 13. A static contact 15 corresponding to the moving contact 11 is provided at the end of the static contact piece 14. A chute 20 parallel to the spring 12 is provided in the box body 5. The moving contact slider 9 is arranged in the chute 20. The moving contact slider 9 slides along the chute 20. The chute 20 plays a guiding role. A magnet block 16 is provided between the static contact piece 13 and the bottom of the box body 5 in the box body 5. The NS poles of the magnet block 16 are on the same straight line as the superposition direction of multiple contact box assemblies 3. The magnetic field directions of the magnet blocks 16 in any two adjacent contact box assemblies 3 are opposite. The switch body formed by superposing multiple contact box assemblies 3 is switched on and off by driving the cam 6 through the rotating shaft 8. The moving contact slider 9 reciprocates under the action of the cam 6 and the spring 12 to drive the moving contact piece 10 to reciprocate, controlling the closing and opening of the moving contact 11 and the static contact 15, thereby realizing the opening and closing of the electrical circuit. When the moving contact 11 and the static contact 15 are disconnected, an arc will be generated. At this time, the magnetic field directions generated by the strip-shaped magnet blocks 16 in the box body 5 are all tangential to the NS closed curve, and the magnetic field directions in the adjacent contact box assemblies 3 are opposite. The magnetic fields generated by the four magnets in each contact box assembly 3 accelerate the magnetic arc extinguishing, prevent the contacts from being severely burned, and at the same time can improve the breaking capacity of the switch, especially for breaking the electrical circuit with high DC inductance.

[0018] As Figure 2 and Figure 3 As shown in the figure, a limit support block 17 is provided on the lower side of the arc structure at the front end of the moving contact slider 9. By pressing the cam 6 on the limit support block 17, tilting can be prevented, which is convenient for assembly. The rear end of the moving contact slider 9 is set as a U-shaped groove 18. Support arms 19 are provided on both sides of the U-shaped groove 18 facing the moving contact 11. The moving contact piece 10 is fixedly connected to the support arms 19, preventing the moving contact piece 10 from being bent due to force or temperature during the switching process, resulting in the failure of the switch.

[0019] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements should also be regarded as within the protection scope of the present utility model.

Claims

1. An auxiliary switch with high breaking capacity, comprising a front mounting plate and a rear mounting plate, wherein a plurality of contact box assemblies are superimposed between the front mounting plate and the rear mounting plate, the front mounting plate, the plurality of contact box assemblies, and the rear mounting plate are sequentially fixed by pull rods, the contact box assembly comprising a box body, a cam is provided in the middle of the box body, a hole is opened in the center of the cam, the hole is a non-circular hole, the holes of the cams of the plurality of contact box assemblies are connected by rotating shafts that match the holes, the two sides of the cam are respectively abutted with a moving contact slider with a circular arc structure at the front end, the front end of the moving contact slider abuts the outer periphery of the cam, and the rear end is connected to a moving contact piece, the end of one side of the moving contact piece is provided with a moving contact, and the other side is connected to the inner wall of the box body by a spring, a static contact piece is fixed to the box body by screws, and the end of the static contact piece is provided with a static contact corresponding to the moving contact, characterized in that A magnet block is fixedly arranged between the static contact piece and the bottom of the box body. The NS pole of the magnet block is in the same straight line as the overlapping direction of multiple contact box assemblies. The magnetic field directions of the magnet blocks in any two adjacent contact box assemblies are opposite.

2. The auxiliary switch with high breaking capacity according to claim 1, characterized in that: A limit support block is provided on the lower side of the circular arc structure at the front end of the moving contact slider, and the cam is pressed on the limit support block.

3. The auxiliary switch with high breaking capacity according to claim 1, characterized in that: The rear end of the moving contact slider is set as a U-shaped groove, and the moving contact piece is fixedly connected in the U-shaped groove.

4. The auxiliary switch with high breaking capacity according to claim 3, characterized in that: Support arms are provided on both sides of the moving contact slider in the direction of the moving contact, and the moving contact piece is fixedly connected to the support arms.

5. The auxiliary switch with high breaking capacity according to claim 1, characterized in that: The hole is a square hole or a pentagonal hole.

6. The auxiliary switch with high breaking capacity according to claim 1, characterized in that: A slide groove is provided in the box body, and the moving contact slider is provided in the slide groove, and the moving contact slider slides along the slide groove.

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