Moving contact bridge unit

Abstract

The utility model relates to a moving contact bridge unit, which comprises a moving contact bridge support provided with a through hole and a moving contact bridge assembly arranged in the through hole in a penetrating manner, wherein the movable contact bridge assembly comprises a sleeve clamp, a clamping plate, and movable contact bridges, supporting plates and elastic pieces which are symmetrically arranged on two sides of the clamping plate in sequence; the movable contact bridges on the two sides are electrically connected through the conductive clamping plates; two ends of the movable contact bridge extend out of the through holes; the two ends of the elastic piece abut against the supporting plate; the sleeve clamp is used for clamping the elastic pieces on the two sides inwards. Compared with the prior art, the clamping plate between the movable contact bridges on the two sides is adjusted to be the conductive clamping plate, so that the movable contact bridges on the two sides are electrically connected, the current trend of the movable contact bridges in the breaking process is changed, and the elastic piece cannot be connected with current to generate high temperature and lose clamping force.

Description

Technical Field

[0001] The utility model belongs to the technical field of switch equipment and relates to a moving contact bridge unit. Background Art

[0002] Most moving contact bridge structures use leaf springs installed on both sides of the moving contact bridge to provide the supporting force of the moving contact bridge. The greater the force with which the moving contact bridge clamps the static contact bridge, the smaller the contact resistance and the more reliable the conduction. If the leaf spring fails due to high temperature, the clamping force will become smaller, resulting in virtual contact between the moving and static contact bridges and increased contact resistance. In severe cases, it may also cause an arc after closing the circuit breaker and burn the contact bridge.

[0003] When the current is interrupted, an arc will be generated. For the DC non-polarity arc extinguishing design, such as the arc extinguishing chamber disclosed in CN107112153A, its non-polarity design will cause the arc to be subjected to a lateral Lorentz force, causing the arc and the arc root to move laterally to both sides of the moving contact bridge, such as Figure 4 As shown in the figure, the arc will burn the two contacts diagonally, forming Figure 4 The current loop in the circuit, that is, the current flows as follows: arc A-upper moving contact bridge-upper support plate-upper elastic member-sleeve clamp-lower elastic member-lower support plate-lower moving contact-arc B. The current flows through the elastic members on both sides, causing the elastic members to heat up, generating high temperature and causing the elastic members to fail, thus causing the above-mentioned problems. Summary of the invention

[0004] The utility model aims to provide a moving contact bridge unit which can prevent the elastic member of the fixed moving contact bridge from being burned by a high-temperature electric arc.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A moving contact bridge unit comprises a moving contact bridge support provided with a through hole, and a moving contact bridge assembly passing through the through hole;

[0007] The movable contact bridge assembly includes a sleeve clamp, a clamping plate, and a movable contact bridge, a support plate, and an elastic member symmetrically arranged on both sides of the clamping plate in sequence;

[0008] The clamping plate is a conductive clamping plate, and the moving contact bridges on both sides are electrically connected through the conductive clamping plate;

[0009] Two ends of the moving contact bridge extend out from the through hole;

[0010] The elastic member is arched in the middle, and its two ends are in contact with the support plate;

[0011] The sleeve clamp is used to clamp the elastic members on both sides inwardly.

[0012] Furthermore, the elastic member is in a "+" shape with a concave middle portion.

[0013] Furthermore, the sleeve clamp is C-shaped, with one end pressed against the middle recessed portion of the elastic member on one side, and the other end passing around one side of the moving contact bridge, the support plate, and the clamping plate in sequence, pressed against the middle recessed portion of the elastic member on the other side, and extending to the other side of the moving contact bridge, the support plate, and the clamping plate.

[0014] Furthermore, the clamping plate is a copper clamping plate.

[0015] Furthermore, the clamping plates are arranged at intervals between the moving contact bridges on both sides along the length direction of the moving contact bridge.

[0016] Furthermore, conductive protrusions are disposed on opposite side walls of the moving contact bridges on both sides, and the conductive protrusions are connected to each other at the clamping plate position and replace the clamping plate, so that the moving contact bridges on both sides are electrically connected and the ends are separated.

[0017] Furthermore, the middle sections of the moving contact bridges on both sides are bent downward to form a bent portion, which is connected to each other at the clamping plate position and replaces the clamping plate, so that the moving contact bridges on both sides are electrically connected and the ends are separated.

[0018] Furthermore, positioning blocks are provided on both sides of the clamping plate, a pair of positioning plates are arranged in parallel in the through hole, positioning grooves are respectively provided on opposite side walls of the positioning plates, and the positioning blocks are embedded in the positioning grooves.

[0019] Furthermore, the moving contact bridge unit also includes a buckle, which includes a card frame for the moving contact bridge to pass through, and side buckles arranged on both sides of the card frame, and a clip is correspondingly provided on the outer side wall of the positioning plate, and the side buckle is engaged with the clip, so that the elastic part on the moving contact bridge assembly is limited between the buckles on both sides.

[0020] Furthermore, the side buckle is a U-shaped buckle with two ends bent and connected to the card frame.

[0021] Furthermore, both sides of the moving contact bridge, the support plate and the clamping plate are provided with slots matched with the sleeve clip, and the sleeve clip is embedded in the slots.

[0022] Furthermore, the sleeve clamp is a plate-shaped bent structure.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model adjusts the clamping plates between the moving contact bridges on both sides to conductive clamping plates, or adjusts the middle section structure of the moving contact bridge, so that the moving contact bridges on both sides are electrically connected, thereby changing the current direction of the moving contact bridge when breaking, so that the elastic part will not be invalidated by high temperature caused by the current and lose the clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a moving contact bridge unit in Example 1;

[0026] Figure 2 is an exploded view of the moving contact bridge unit in Example 1;

[0027] Figure 3 is a side view of the moving contact bridge assembly in Example 1;

[0028] Figure 4 Schematic diagram of the movement direction of the arc root subjected to the Lorentz force in Example 1;

[0029] Figure 5 is a structural diagram of the insulating member in Example 1;

[0030] Figure 6 is a side view of the moving contact bridge assembly in Example 2;

[0031] Figure 7 is a side view of the moving contact bridge assembly in Example 3;

[0032] Figure 8 is a side view of the moving contact bridge assembly in Example 4;

[0033] Among them: 1 is a moving contact bridge unit, 2 is a buckle, 3 is a moving contact bridge assembly, 31 is a moving contact bridge, 32 is a support plate, 33 is an elastic member, 34 is a clamp, 35 is a sleeve clamp, and 4 is a moving contact bridge support. DETAILED DESCRIPTION

[0034] The following embodiments are implemented based on the above technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following embodiments.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0037] Example 1

[0038] like Figure 1-3 and Figure 5As shown, a moving contact bridge unit 1 includes a moving contact bridge support 4 provided with a through hole, and a moving contact bridge assembly inserted in the through hole; wherein the moving contact bridge assembly includes a sleeve clamp 35, a clamp plate 34, and a moving contact bridge 31, a support plate 32, and an elastic member 33 symmetrically arranged on both sides of the clamp plate 34 in sequence; both ends of the moving contact bridge 31 extend out from the through hole; the elastic member 33 is in a "J" shape with a concave middle portion, and the sleeve clamp 35 is in a C shape, with one end pressed against the concave middle portion of the elastic member 33 on one side, and the other end bypasses one side of the moving contact bridge 31, the support plate 32, and the clamp plate 34 in sequence, pressed against the concave middle portion of the elastic member 33 on the other side, and extended to the other side of the moving contact bridge 31, the support plate 32, and the clamp plate 34.

[0039] The clamping plate 34 is a conductive clamping plate, and the movable contact bridges 31 on both sides are electrically connected through the conductive clamping plate. In this embodiment, the clamping plate between the movable contact bridges on both sides is adjusted to a conductive clamping plate, so that the movable contact bridges on both sides are electrically connected, thereby changing the current flow of the movable contact bridge when breaking, so that the elastic member will not be subjected to current to generate high temperature and fail, and lose the clamping force.

[0040] Specifically, the material of the moving contact bridge 31 is copper, the material of the support plate 33 is stainless steel, and the material of the elastic member is manganese steel.

[0041] In some specific embodiments, the clamping plate 34 is a copper clamping plate.

[0042] In some specific embodiments, positioning blocks are provided on both sides of the clamping plate 34, a pair of positioning plates are arranged side by side in the through hole, positioning grooves are respectively provided on opposite side walls of the positioning plates, and the positioning blocks are embedded in the positioning grooves.

[0043] In some specific embodiments, the moving contact bridge unit also includes a buckle 2, which includes a card frame for the moving contact bridge 31 to pass through, and side buckles arranged on both sides of the card frame, and clips are correspondingly provided on the outer side wall of the positioning plate. The side buckles are engaged with the clips, and the elastic member 33 on the moving contact bridge assembly is limited between the buckles 2 on both sides.

[0044] In some specific embodiments, the side buckle is a U-shaped buckle with two ends bent and connected to the card frame.

[0045] In some specific embodiments, both sides of the moving contact bridge 31, the support plate 32, and the clamping plate 34 are provided with slots adapted to the sleeve clip 35, and the sleeve clip 35 is embedded in the slot, and the sleeve clip 36 is limited by the slot to ensure installation stability.

[0046] In some specific embodiments, the sleeve clamp 35 is in a plate-shaped bent structure, and the flat plate-shaped structure is conducive to the cooperation with the slotted limiter.

[0047] Working principle:

[0048] like Figure 2The buckle 2 fixes the second moving contact bridge assembly 3 in the moving contact bridge support 4 to form the first moving contact bridge assembly 1. Figure 3 The fixed sides of the elastic members 33 on both sides are against the two ends of the inner side of the sleeve clamp 35, and the force-applying sides are against the support plate 32. The support plate 32 is in contact with the moving contact bridge 31, and the clamping plate 34 is clamped in the middle of the sleeve clamp 35 by the moving contact bridges 31 on both sides. The clamping plate 35 is made of conductive material, preferably copper-based material, so that when diagonal arc ablation occurs, the current path is as follows Figure 5 As shown: arc A-upper moving contact bridge 31-clamp 35-lower moving contact bridge 31-arc B.

[0049] Example 2

[0050] A moving contact bridge unit, the structure of which is different from that of embodiment 1 only in that:

[0051] like Figure 6 As shown, the clamping plates 34 are arranged between the moving contact bridges 31 at intervals along the length direction of the moving contact bridge 31. Alternatively, a cushion block is used to replace the clamping plates 32. The rest is the same as in the first embodiment.

[0052] Example 3

[0053] A moving contact bridge unit, the structure of which is different from that of embodiment 1 only in that:

[0054] like Figure 7 As shown, conductive bumps are disposed on opposite side walls of the moving contact bridges 31 on both sides, and the conductive bumps are connected to each other at the clamping plate 34 and replace the clamping plate 34, so that the moving contact bridges 31 on both sides are electrically connected and the ends are separated. The rest is the same as in the first embodiment.

[0055] Example 4

[0056] A moving contact bridge unit, the structure of which is different from that of embodiment 1 only in that:

[0057] like Figure 8 As shown, the middle sections of the moving contact bridges 31 on both sides are bent downward to form a bent portion, which is connected to the clamping plate 34 and replaces the clamping plate 34, so that the moving contact bridges 31 on both sides are electrically connected and the ends are separated. The rest is the same as in the first embodiment.

[0058] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A moving contact bridge unit, characterized in that: It comprises a moving contact bridge support (4) provided with a through hole, and a moving contact bridge component inserted into the through hole; The movable contact bridge assembly comprises a sleeve clamp (35), a clamping plate (34), and a movable contact bridge (31), a support plate (32), and an elastic member (33) which are symmetrically arranged on both sides of the clamping plate (34). The clamping plate (34) is a conductive clamping plate, and the movable contact bridges (31) on both sides are electrically connected via the conductive clamping plate; Two ends of the moving contact bridge (31) extend out from the through hole; The elastic member (33) is arched in the middle, and its two ends are in contact with the support plate (32); The sleeve clamp (35) is used to clamp the elastic members (33) on both sides inwardly.

2. The moving contact bridge unit according to claim 1, characterized in that: The clamping plate (34) is a copper clamping plate.

3. The moving contact bridge unit according to claim 1, characterized in that: The clamping plates (34) are arranged at intervals between the moving contact bridges (31) on both sides along the length direction of the moving contact bridge (31).

4. The moving contact bridge unit according to claim 1, characterized in that: Conductive protrusions are provided facing each other on opposite side walls of the moving contact bridges (31) on both sides. The conductive protrusions are connected to each other at the position of the clamping plate (34) and replace the clamping plate (34), so that the moving contact bridges (31) on both sides are electrically connected and the ends are separated.

5. The moving contact bridge unit according to claim 1, characterized in that: The middle sections of the moving contact bridges (31) on both sides are bent downward to form a bent portion, which is connected to the clamping plate (34) and replaces the clamping plate (34), so that the moving contact bridges (31) on both sides are electrically connected and the ends are separated.

6. The moving contact bridge unit according to claim 1, characterized in that: Positioning blocks are provided on both sides of the clamping plate (34), a pair of positioning plates are arranged in parallel in the through hole, positioning slots are respectively provided on opposite side walls of the positioning plates, and the positioning blocks are embedded in the positioning slots.

7. The moving contact bridge unit according to claim 6, characterized in that: The moving contact bridge unit also includes a buckle (2), the buckle (2) including a clamping frame for the moving contact bridge (31) to pass through, and side buckles provided on both sides of the clamping frame, the outer side wall of the positioning plate is correspondingly provided with a clip, the side buckle is engaged with the clip, and the elastic member (33) on the moving contact bridge assembly is limited between the buckles (2) on both sides.

8. The moving contact bridge unit according to claim 7, characterized in that: The side buckles are U-shaped buckles with both ends bent and connected to the card frame.

9. The moving contact bridge unit according to claim 1, characterized in that: Both side edges of the moving contact bridge (31), the support plate (32) and the clamping plate (34) are provided with slots matching the sleeve clamp (35), and the sleeve clamp (35) is embedded in the slots.

10. The moving contact bridge unit according to claim 9, characterized in that: The sleeve clamp (35) is a plate-shaped bent structure.

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