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; two ends of the movable contact bridge extend out of the through hole; 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. The insulating piece comprises a fixing part clamped between the elastic piece and the supporting plate and bending parts arranged on the two sides of the fixing part, and the bending parts are bent to cover the two sides of the elastic piece. Compared with the prior art, the insulating part which is bent towards the elastic part can prevent the arc root from moving towards the elastic part, so that the elastic part is prevented from being ablated by the electric arc to fail 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 clamping 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 the contact resistance will increase. 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, and the arc root on the moving contact bridge will be attracted to the leaf springs on both sides, especially for the DC non-polar arc extinguishing design, such as the arc extinguishing chamber disclosed in CN107112153A, the non-polar design will cause the arc to be subjected to the lateral Lorentz force, so that the arc and the arc root will move laterally to the two sides of the moving contact bridge. The leaf springs are arranged on both sides of the moving contact bridge. The high temperature arc will cause the leaf springs to fail or even burn, thereby reducing the clamping force. Figure 4 The arc root moves in the direction where F is the Lorentz force on the arc. Utility Model Content

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

[0009] The elastic member is arched in the middle, and its two ends are in contact with the support plate;

[0010] The sleeve clamp is used to clamp the elastic members on both sides inwardly;

[0011] The insulating member includes a fixing portion clamped between the elastic member and the support plate, and bending portions arranged on both sides of the fixing portion.

[0012] The bent portion is bent and covers both sides of the elastic member.

[0013] Furthermore, the elastic member is in a "+" shape with a concave middle portion.

[0014] 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.

[0015] Furthermore, both sides of the moving contact bridge, the insulating member, the support plate and the clamping plate are provided with slots matched with the elastic member, and the elastic member is embedded in the slots.

[0016] Furthermore, the sleeve clamp is a plate-shaped bent structure.

[0017] 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.

[0018] Furthermore, a plurality of positioning blocks are provided on both sides of the clamping plate.

[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 fixing portion in the insulating member is clamped between the support plate and the moving contact bridge.

[0021] Furthermore, the side buckle is a U-shaped buckle with two ends bent and connected to the card frame.

[0022] Furthermore, the end of the bent portion extends to the outer edge of the middle recess of the elastic member.

[0023] Furthermore, the clamping plate, the moving contact bridge, the support plate and the elastic member are symmetrically arranged with respect to the sleeve clamp.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] The insulating member bent toward the elastic member of the utility model can prevent the arc root from moving toward the elastic member, so that the elastic member will not be burned by the arc and fail, and lose the clamping force. At the same time, the insulating member also has a certain heat insulation effect, reducing the heat conduction of the moving contact bridge on the elastic member and thus causing failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a moving contact bridge unit in Example 1;

[0027] Figure 2 is an exploded view of the moving contact bridge unit in Example 1;

[0028] Figure 3 is a side view of the moving contact bridge assembly in Example 1;

[0029] Figure 4 Schematic diagram of the movement direction of the arc root subjected to the Lorentz force in Example 1;

[0030] Figure 5 is a structural diagram of the insulating member in Example 1;

[0031] Figure 6 is a side view of the moving contact bridge assembly in Example 2;

[0032] Figure 7 is a side view of the moving contact bridge assembly in Example 3;

[0033] Description of the markings in the figure:

[0034] 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 clamp, 33 is a support plate, 34 is an elastic member, 35 is an insulating member, 351 is a bending portion, 36 is a sleeve clamp, and 4 is a moving contact bridge support. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Example:

[0039] like Figure 1 , Figure 2A moving contact bridge unit shown in the figure comprises a moving contact bridge support 4 provided with a through hole, and a moving contact bridge assembly penetrated in the through hole; wherein the moving contact bridge assembly comprises a sleeve clamp 36, a clamp plate 32, and a moving contact bridge 31, a support plate 33, and an elastic member 34 symmetrically arranged on both sides of the clamp plate 32 in sequence; both ends of the moving contact bridge 31 extend out from the through hole; the elastic member 34 is in a "J" shape with a concave middle part, and the sleeve clamp 36 is in a C shape, with one end pressed against the concave middle part of the elastic member 34 on one side, and the other end bypassing one side of the moving contact bridge 31, the support plate 33, and the clamp plate 32 in sequence, pressed against the concave middle part of the elastic member 34 on the other side, and extending to the other side of the moving contact bridge 31, the support plate 33, and the clamp plate 32.

[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] like Figure 2-4 As shown, the moving contact bridge unit also includes an insulating member 35, which includes a fixed portion clamped between the elastic member 34 and the support plate 33, and a bent portion 351 provided on both sides of the fixed portion, and the bent portion 351 is bent to cover both sides of the elastic member 34. The insulating member 35 bent toward the elastic member 34 can prevent the arc root from moving toward the elastic member 34, so that the elastic member 34 will not be burned by the arc and fail, and lose the clamping force. Specifically, the insulating member 35 is made of NOMEX cardboard.

[0042] At the same time, the insulating member 35 also has a certain heat insulation effect, reducing the heat conduction of the moving contact bridge on the elastic member and thus preventing it from failing.

[0043] In some specific embodiments, both sides of the moving contact bridge 31, the support plate 33, and the clamping plate 32 are provided with slots adapted to the sleeve clip 36, and the sleeve clip 36 is embedded in the slots. The sleeve clip 36 is limited by the slots to ensure installation stability.

[0044] In some specific embodiments, the sleeve clamp 36 is in a plate-shaped bent structure, and the flat plate-shaped structure is conducive to the cooperation with the slotted limiter.

[0045] In some specific embodiments, positioning blocks are provided on both sides of the clamping plate 32, 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.

[0046] In some specific embodiments, a plurality of positioning blocks are provided on both sides of the clamping plate 32 to stabilize the state.

[0047] 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 34 on the moving contact bridge assembly is limited between the buckles 2 on both sides.

[0048] In some specific embodiments, the end of the bent portion 351 extends to the outer edge of the middle recess of the elastic member 34 .

[0049] In some specific embodiments, the clamping plate 32 , the moving contact bridge 31 , the support plate 33 , and the elastic member 34 are symmetrically arranged with respect to the sleeve clamp 36 .

[0050] Working principle:

[0051] like Figure 2 The buckle 2 fixes the moving contact bridge assembly 3 in the moving contact bridge support 4 to form a moving contact bridge unit 1. Figure 3 The fixed sides of the elastic members 34 on both sides are against the two ends of the inner side of the sleeve clamp 36, and the force-applying sides are against the support plate 33. The support plate 33 is in contact with the moving contact bridge 31, and the clamping plate 32 is clamped in the middle of the sleeve clamp 36 by the moving contact bridges 31 on both sides. Figure 3 An insulating member 35 is sandwiched between the elastic member 34 and the support plate 33. The insulating member 35 has a bent portion 351 at both ends close to the moving contact bridge. The bent portion 351 is bent toward both ends of the elastic member 34 to block the arc root.

[0052] Embodiment 2:

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

[0054] like Figure 6 The insulating member 35 is not limited to being disposed between the elastic member 34 and the support plate 33, but may also be disposed between the support plate 33 and the moving contact bridge 31. The insulating member 35 and its bent portion 351 extend from the outer side surface of the moving contact bridge 31 or the outer side surface of the support plate 33 to the end of the elastic member 34, so as to play a role in blocking the arc root. The rest is the same as in Embodiment 1.

[0055] Embodiment 3:

[0056] A moving contact bridge unit, the structure of which is different from that of the first embodiment only in that the insulating member 35 can also be arranged only on the outer side of the moving contact bridge 31 or the outer side of the support plate 33, without a bent portion, such as Figure 7 As shown, the effect of blocking the arc root is not as significant as that of the bent portion.

[0057] 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 assembly passing through the through hole; The movable contact bridge assembly comprises a sleeve clamp (36), an insulating member (35), a clamping plate (32), and a movable contact bridge (31), a support plate (33), and an elastic member (34) which are symmetrically arranged on both sides of the clamping plate (32). Two ends of the moving contact bridge (31) extend out from the through hole; The elastic member (34) is arched in the middle, and its two ends are in contact with the support plate (33); The sleeve clamp (36) is used to clamp the elastic members (34) on both sides inwardly; The insulating member (35) comprises a fixing portion clamped between the elastic member (34) and the support plate (33), and bending portions (351) arranged on both sides of the fixing portion. The bent portion (351) is bent and covers both sides of the elastic member (34).

2. The moving contact bridge unit according to claim 1, characterized in that: Both sides of the moving contact bridge (31), the support plate (33) and the clamping plate (32) are provided with slots matched with the sleeve clamp (36), and the sleeve clamp (36) is embedded in the slots.

3. The moving contact bridge unit according to claim 1, characterized in that: The sleeve clamp (36) is in the form of a plate-shaped bent structure.

4. The moving contact bridge unit according to claim 1, characterized in that: Positioning blocks are arranged on both sides of the clamping plate (32), a pair of positioning plates are arranged in parallel in the through hole, positioning slots are respectively arranged on the opposite side walls of the positioning plates, and the positioning blocks are embedded in the positioning slots.

5. The moving contact bridge unit according to claim 4, characterized in that: A plurality of positioning blocks are arranged on both sides of the clamping plate (32).

6. The moving contact bridge unit according to claim 4, 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 arranged 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 (34) on the moving contact bridge assembly is limited between the buckles (2) on both sides.

7. The moving contact bridge unit according to claim 6, characterized in that: The side buckles are U-shaped buckles with both ends bent and connected to the card frame.

8. The moving contact bridge unit according to claim 1, characterized in that: The fixing portion in the insulating member (35) is clamped and fixed between the support plate (33) and the moving contact bridge (31).

9. The moving contact bridge unit according to claim 1, characterized in that: The end of the bent portion (351) extends to the middle of the elastic member (34).

10. The moving contact bridge unit according to claim 1, characterized in that: The clamping plate (32), the movable contact bridge (31), the support plate (33) and the elastic member (34) are respectively arranged symmetrically with respect to the sleeve clamp (36).

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