Static contact assembly of circuit breaker

Abstract

The utility model relates to a static contact assembly of a circuit breaker. The static contact assembly comprises a static contact bridge, a contact, an arc striking sheet, an insulation limiting plate and an insulation backing plate. Wherein the static contact bridge comprises a connecting part and a bending part which are connected in sequence; the contact and the arc striking sheet are electrically connected with the bending part in sequence; the insulating limiting plate is provided with a limiting groove, and the arc striking sheet is embedded in the limiting groove in a conformal manner. And the insulating base plate is fixedly supported between the insulating limiting plate and the static contact bridge. Compared with the prior art, the insulating limiting plate is additionally arranged outside the arc striking sheet, the arc striking sheet is fixed by utilizing the limiting groove in which the arc striking sheet is embedded in a conformal manner, and the insulating base plate is fixedly cushioned between the insulating limiting plate and the static contact bridge, so that the static contact assembly is prevented from being impacted by the moving contact to deform after multiple times of opening and closing.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to a static contact assembly of a circuit breaker. Background Art

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and closing, carrying, and interrupting current under abnormal circuit conditions within a specified timeframe. A circuit breaker comprises a contact system, an operating mechanism, and an arc extinguishing system. A conventional contact system consists of a moving contact and a stationary contact. The opening and closing of the moving and stationary contacts correspond to the opening and closing of the circuit breaker. Furthermore, the stationary contact has a static contact point, one end of which is located in front of the arc extinguishing chamber to guide the arc into the arc extinguishing chamber for prolonged extinguishing.

[0003] The internal support structure of the static contact bridge of the existing molded case circuit breaker is unstable and easily deformed after multiple opening and closing operations, resulting in failure to close the circuit or poor contact. Utility Model Content

[0004] The purpose of the utility model is to provide a static contact assembly for a circuit breaker, which is used to solve the problem that the internal support structure of the static contact bridge of the existing molded case circuit breaker is unstable and easily deformed after multiple opening and closing, resulting in failure to close or poor contact.

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

[0006] A static contact assembly of a circuit breaker, comprising

[0007] The static contact bridge comprises a connecting portion and a bending portion connected in sequence;

[0008] The contact and the arc-starting piece are electrically connected to the bent portion in sequence;

[0009] The insulating limiting plate is provided with a limiting groove, and the arc striking piece is conformally embedded in the limiting groove; and

[0010] The insulating pad is fixedly supported between the insulating limit plate and the static contact bridge.

[0011] Furthermore, the arc-striking piece includes an arc-striking circular portion, a necked connection portion, and a laterally extending portion that are sequentially connected;

[0012] The shape of the limiting groove is adapted to the arc-striking piece so that the arc-striking piece is conformally embedded in the limiting groove.

[0013] Furthermore, a stepped hole is provided on the connecting part, a pad through hole is provided on the insulating pad, a limited through hole is provided at the bottom of the limiting groove, and a threaded hole is provided on the arc-striking circular part. The static contact bridge, insulating pad, insulating limiting plate, and arc-striking piece are fixedly connected by bolts that are sequentially provided with stepped holes, pad through holes, limiting through holes, and threaded holes.

[0014] Furthermore, both sides of the insulating pad are provided with contraction sections adapted to the contraction connection parts.

[0015] Furthermore, bosses for mounting and connecting the arc extinguishing chamber are provided on both sides of the limiting groove.

[0016] Furthermore, reinforcing ribs are provided between the two sides of the boss and the outer wall of the limiting groove.

[0017] Furthermore, the bending portion is U-shaped, and the connecting portion is bent and connected to the bending portion.

[0018] The insulating pad is conformably bent so that the front section of the insulating pad is fixedly supported between the insulating limit plate and the static contact bridge, and the rear section abuts against the inner side of the bent portion.

[0019] Furthermore, a plurality of reinforcing ribs are arranged on the top surface of the insulating pad in a crisscross manner; the plurality of reinforcing ribs abut against the bottom side of the insulating limiting plate and the inner side of the bent portion.

[0020] Furthermore, the arc-starting piece is a copper arc-starting piece with a silver-plated surface.

[0021] Furthermore, the static contact bridge is a copper static contact bridge with a silver-plated surface.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The utility model adds an insulating limit plate to the arc striking piece, uses the limit groove of the arc striking piece to fit the arc striking piece, and fixes the arc striking piece by fixing an insulating pad between the insulating limit plate and the static contact bridge to prevent the static contact assembly from being deformed by the impact of the moving contact after multiple opening and closing operations.

[0024] 2) The utility model adopts the arc protection design of the insulating spacer and the insulating limit plate, utilizing their electrical insulation to prevent the static contact assembly from being burned during opening and closing, thereby extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the three-dimensional structure of a static contact assembly of a circuit breaker in an embodiment;

[0026] Figure 2 An exploded view of a static contact assembly of a circuit breaker in an embodiment;

[0027] Description of the marks in the figure:

[0028] 1-static contact bridge, 11-stepped hole, 12-connecting part, 13-bending part, 14-recess, 2-arc-starting plate, 21-threaded hole, 22-arc-starting circular part, 23-shrinking connection part, 24-lateral extension part, 3-contact, 4-insulating pad, 41-pad through hole, 5-insulating limiting plate, 51-limiting groove, 52-limiting through hole. DETAILED DESCRIPTION

[0029] The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0030] 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, it does not require further definition or explanation in subsequent drawings.

[0031] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0032] Example:

[0033] like Figure 1 and Figure 2 The illustrated circuit breaker static contact assembly includes a static contact bridge 1, a contact 3 and an arc-striking piece 2, an insulating stopper 5, and an insulating backing plate 4. The static contact bridge 1 includes a connecting portion 12 and a bent portion 13 connected in sequence; the contact 3 and the arc-striking piece 2 are electrically connected to the bent portion 13 in sequence; the insulating stopper 5 defines a stopper slot 51, into which the arc-striking piece 2 conformably fits; and the insulating backing plate 4 is fixedly supported between the insulating stopper plate 5 and the static contact bridge 1.

[0034] During operation, the arc-strike piece 2 guides the arc into the arc-extinguishing chamber. The insulating limit plate 5 conforms to the arc-strike piece 2 through the limit groove 51. The insulating spacer 4 is fixed between the insulating limit plate 5 and the static contact bridge 1 to prevent deformation of the static contact assembly caused by the impact of the moving contact after repeated opening and closing. Furthermore, the electrical insulation of the insulating spacer 4 and the insulating limit plate 5 prevents the arc from burning the static contact bridge 1, thereby extending its service life.

[0035] The electrical insulating material in this embodiment can be thermoplastic electrical insulating materials such as polyvinyl chloride, polyethylene, polytetrafluoroethylene, chloroprene rubber, and polyvinyl acetal.

[0036] In some specific embodiments, the static contact bridge 1 is formed by bending a copper plate and is silver-plated on the surface.

[0037] In some specific embodiments, the bending portion 13 of the static contact bridge 1 is U-shaped, the connecting portion 12 is connected to the bending portion 13 by bending, and the bending direction is opposite to the bending direction of the bending portion 13 .

[0038] In some specific embodiments, the arc-striking piece 2 includes an arc-striking circular portion 22, a necked connection portion 23, and a transversely extending portion 24 that are sequentially connected in the longitudinal direction; more specifically, the arc-striking circular portion 22 is in the shape of a circular sheet, the two sides of the necked connection portion 23 are concave inward, and the transversely extending portion 24 is in the shape of a transversely arranged rectangular sheet; the arc-striking circular portion 22, the necked connection portion 23, and the transversely extending portion 24 are sequentially smoothly connected;

[0039] Moreover, the lateral dimensions of the arc-striking circular portion 22 and the lateral dimensions of the laterally extended portion 24 are both larger than the lateral dimensions of the narrowest part of the necked connection portion 23, and the shape of the limiting groove 51 is adapted to the arc-striking piece 2 so that the arc-striking piece 2 is conformably embedded in the limiting groove 51.

[0040] In some specific embodiments, a stepped hole 11 is formed on the connecting portion 12, a backing plate through-hole 41 is formed on the insulating backing plate 4, a limiting through-hole 52 is formed at the bottom of the limiting groove 51, and a threaded hole 21 is formed on the arc-starting circular portion 22. The static contact bridge 1, the insulating backing plate 4, the insulating limiting plate 5, and the arc-starting piece 2 are fixedly connected by bolts that pass through the stepped hole 11, the backing plate through-hole 41, the limiting through-hole 52, and the threaded hole 21 in sequence. More specifically, the bolts used are also made of electrically insulating material.

[0041] In some specific embodiments, both sides of the insulating pad 4 are provided with contraction sections adapted to the contraction connection portion 23 .

[0042] In some specific embodiments, bosses 53 for mounting and connecting the arc extinguishing chamber are further provided on both sides of the limiting groove 51 .

[0043] In some specific embodiments, reinforcing ribs are further provided between the two sides of the boss 53 and the outer wall of the limiting groove 51 .

[0044] In some specific embodiments, the insulating pad 4 is conformally bent so that the front section of the insulating pad 4 is fixedly supported between the insulating limit plate 5 and the static contact bridge 1 , and the rear section abuts against the inner side of the bent portion 13 .

[0045] In some specific embodiments, the top surface of the insulating pad 4 is provided with a plurality of reinforcing ribs in a crisscross pattern; the plurality of reinforcing ribs are in contact with the bottom side of the insulating limit plate 5 and the inner side of the bending portion 13. The reinforcing rib structure ensures structural strength while reducing material usage, which is conducive to improving lightweight and reducing costs.

[0046] In some specific embodiments, the arc-starting piece 2 is a copper arc-starting piece with a silver-plated surface to enhance conductivity.

[0047] In some specific embodiments, during assembly, the contact 3 and the arc-starting piece 2 are respectively welded to the outside of the bent portion 13 of the static contact bridge 1; during welding, the guide column on the bottom side of the laterally extended portion 24 of the arc-starting piece 2 can be inserted into the recess 14 on the outside of the end of the bent portion 13 for positioning. The insulating limit plate 5 is installed from below, and the arc-starting circular portion 22 and the necked connection portion 23 are embedded in the limit groove 51 and fit together. The insulating pad 4 is placed between the connecting portion 12 of the static contact bridge 1 and the insulating limit plate 5, and the bend of the insulating pad 4 is fit together with the inner side of the bent portion 13 of the static contact bridge 1. Thereafter, bolts are passed through the stepped hole 11, the pad through hole 41, the limit through hole 52 in sequence, and are threadedly connected to the threaded hole 21 to fasten the static contact bridge 1, the insulating pad 4, the insulating limit plate 5 and the arc-starting piece 2 in sequence.

[0048] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A static contact assembly of a circuit breaker, characterized in that: include: A stationary contact bridge (1) comprises a connecting portion (12) and a bending portion (13) connected in sequence; The contact (3) and the arc-starting piece (2) are electrically connected to the bending portion (13) in sequence; The insulating limiting plate (5) is provided with a limiting groove (51), and the arc striking piece (2) is conformally embedded in the limiting groove (51); and, The insulating pad (4) is fixedly supported between the insulating limit plate (5) and the static contact bridge (1).

2. The static contact assembly of the circuit breaker according to claim 1, characterized in that: The arc-striking piece (2) comprises an arc-striking circular portion (22), a necked connection portion (23), and a transversely extending portion (24) which are connected in sequence; The shape of the limiting groove (51) is adapted to the arc-striking piece (2), so that the arc-striking piece (2) is conformably embedded in the limiting groove (51).

3. The static contact assembly of the circuit breaker according to claim 2, characterized in that: The connecting portion (12) is provided with a stepped hole (11), the insulating pad (4) is provided with a pad through hole (41), the bottom of the limiting groove (51) is provided with a limiting through hole (52), the arc-starting circular portion (22) is provided with a threaded hole (21), and the static contact bridge (1), the insulating pad (4), the insulating limiting plate (5), and the arc-starting piece (2) are fixedly connected by bolts which are sequentially penetrated through the stepped hole (11), the pad through hole (41), the limiting through hole (52), and the threaded hole (21).

4. The static contact assembly of the circuit breaker according to claim 2, characterized in that: Both sides of the insulating pad (4) are provided with contraction sections adapted to the contraction connection portion (23).

5. The static contact assembly of the circuit breaker according to claim 1, characterized in that: Bosses (53) for mounting and connecting the arc extinguishing chamber are also provided on both sides of the limiting groove (51).

6. The static contact assembly of the circuit breaker according to claim 5, characterized in that: Reinforcing ribs are also provided between the two sides of the boss (53) and the outer wall of the limiting groove (51).

7. The static contact assembly of the circuit breaker according to claim 1, characterized in that: The bending portion (13) is U-shaped, and the connecting portion (12) is connected to the bending portion (13) by bending. The insulating pad (4) is bent in a conformable manner so that the front section of the insulating pad (4) is fixedly supported between the insulating limit plate (5) and the static contact bridge (1), and the rear section abuts against the inner side of the bent portion (13).

8. The static contact assembly of the circuit breaker according to claim 7, characterized in that: The top surface of the insulating pad (4) is provided with a plurality of reinforcing ribs in a crisscross pattern; the plurality of reinforcing ribs abut against the bottom side of the insulating limit plate (5) and the inner side of the bent portion (13).

9. The static contact assembly of the circuit breaker according to claim 1, characterized in that: The arc-starting piece (2) is a copper arc-starting piece with a silver-plated surface.

10. The static contact assembly of the circuit breaker according to claim 1, characterized in that: The static contact bridge (1) is a copper static contact bridge with a silver-plated surface.

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