Contact structure of circuit breaker

Abstract

The present invention discloses a contact structure of a circuit breaker, comprising a base shell, a moving contact assembly and a static contact assembly arranged on the base shell, wherein the static contact assembly comprises a current-carrying part and a first induction part connected to the current-carrying part, and a static contact piece is arranged at the end of the first induction part, and the moving contact assembly comprises a contact support and a moving contact connected to the contact support, and the moving contact comprises a second induction part, and a moving contact piece is arranged at the end of the second induction part, and when the moving contact assembly and the static contact assembly are closed, the first induction part and the second induction part are close to each other and in a parallel state. The present invention utilizes the electric repulsion between the contacts, can realize the rapid separation between the contacts, and improve the circuit breaking effect.

Description

Technical Field

[0001] The invention relates to a contact structure of a circuit breaker. Background Art

[0002] Conventional circuit breakers generally include a contact structure, which includes a moving contact, a stationary contact, an operating mechanism, a tripping mechanism, etc. When a short circuit, overload, leakage, etc. occurs in the working circuit, the tripping mechanism can drive the moving contact and the stationary contact to separate, thereby cutting off the working circuit. However, due to the hysteresis of the triggering action of the tripping mechanism, the separation speed between the moving and stationary contacts is slow, resulting in poor use effect. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a contact structure for a circuit breaker, which utilizes the electromotive force of repulsion between contacts to achieve rapid separation between contacts and improve the circuit breaking effect.

[0004] To achieve the above-mentioned purpose, the present invention provides a contact structure of a circuit breaker, comprising a base shell and a moving contact assembly and a static contact assembly arranged on the base shell, wherein the static contact assembly comprises a current-carrying part and a first sensing part connected to the current-carrying part, and a static contact piece is arranged at the end of the first sensing part, and the moving contact assembly comprises a contact support and a moving contact connected to the contact support, and the moving contact comprises a second sensing part, and a moving contact piece is arranged at the end of the second sensing part, and when the moving contact assembly and the static contact assembly are closed, the first sensing part and the second sensing part are close to each other and in a parallel state.

[0005] The beneficial effects of the present invention are as follows: when the moving contact assembly and the stationary contact assembly are closed, the first induction part of the stationary contact assembly and the second induction part of the moving contact are close to each other and in a parallel state. When current passes through the first induction part and the second induction part respectively, an electric repulsive force can be provided to cause the moving contact assembly to move away from the stationary contact assembly. Under normal circumstances, the moving contact assembly and the stationary contact assembly are still maintained in a normal closed state under the action of the tripping mechanism. When tripping occurs, the electric repulsive force between the first induction part and the second induction part drives the moving contact assembly and the stationary contact assembly to separate quickly, thereby improving the circuit breaking effect.

[0006] Furthermore, the current-carrying portion has a V-shaped structure, and the first sensing portion is connected to one end of the current-carrying portion and is arranged toward an extension direction of the one end of the current-carrying portion.

[0007] The advantage brought by the further arrangement is that the current-carrying part adopts a V-shaped design, and the first sensing part is arranged in the extension direction of one end of the current-carrying part, which can increase the sensing range between the moving contact assembly and the static contact assembly, thereby further improving the electric repulsion.

[0008] Furthermore, the current-carrying part and the first sensing part are formed by bending the same flat metal profile, the current-carrying part and the first sensing part are arranged perpendicular to each other, one end of the first sensing part and one end of the current-carrying part are bent and connected, the wide surface of the first sensing part is arranged corresponding to the second sensing part, and the other end of the first sensing part is bent to form a connecting part that cooperates with the static contact piece.

[0009] The advantages brought by the further arrangement are: the flat metal profile is bent and processed to form the current-carrying part, the first sensing part and the connecting part respectively, which can reduce costs, facilitate processing and improve production efficiency; the wide surface of the first sensing part is arranged corresponding to the second sensing part, which can improve the induction effect of the two, thereby further improving the electric repulsion.

[0010] Furthermore, one side of the connecting part includes a first welding surface which is welded and fixed to the static contact piece, and the other side of the connecting part opposite to the first welding surface includes a second welding surface, and an arc-starting piece is welded and fixed on the second welding surface. The connecting part also includes a third welding surface adjacent to the first welding surface and the second welding surface, and one end of the arc-starting piece is bent to form an L-shaped notch, and the inner walls on both sides of the L-shaped notch are respectively welded and fixed to the second welding surface and the third welding surface.

[0011] The advantage brought by further setting is that the inner walls on both sides of the L-shaped notch of the static contact plate and the arc-starting plate are respectively welded and fixed on the first welding surface, the second welding surface and the third welding surface, the welding points can be better positioned and are not easy to fall off, which can improve the stability and conductive effect.

[0012] Furthermore, the base shell includes a long groove for embedding and positioning the static contact assembly and a groove arranged adjacent to the long groove. The long groove is V-shaped as a whole. The middle part of the long groove includes a shallow groove for embedding and positioning with the current-carrying part. One end of the long groove includes a first deep groove distributed in a stepped manner with the shallow groove. The first deep groove is embedded and positioned with the first sensing part, and the moving contact assembly is arranged in the groove.

[0013] The advantages brought by the further setting are: the setting of the shallow groove ensures that when the flat current-carrying part is embedded in the shallow groove, it will not occupy too much lateral width of the circuit breaker, making the overall structure of the circuit breaker more compact; the setting of the first deep groove can be coordinated with the embedded positioning of the first sensing part, and the stepped structure between the shallow groove and the first deep groove can improve the positioning effect of the current-carrying part and the first sensing part, making it less likely to shake.

[0014] Furthermore, the end of the first deep groove is open, the connecting portion and the static contact piece extend from the end of the first deep groove, a blocking wall is formed on one side of the first deep groove, the first sensing portion and the second sensing portion are respectively located on both sides of the blocking wall, the second sensing portion has an arc-shaped convex portion on a side corresponding to the first sensing portion, and the blocking wall has an arc-shaped concave portion adapted to the shape of the arc-shaped convex portion on a side corresponding to the second sensing portion.

[0015] The advantages brought by the further setting are: the setting of the retaining wall can play a role in blocking the first sensing part and the second sensing part when the moving and static contact assemblies are closed, avoiding the occurrence of electric arcs, improving the safety performance of the circuit breaker, and can also make the first sensing part and the second sensing part closer together, thereby increasing the generated electric repulsion. The setting of the arc-shaped convex part can fit with the arc-shaped concave part when closed, thereby further increasing the induction range between the second sensing part and the second sensing part, making the first sensing part and the second sensing part closer together, thereby further increasing the electric repulsion between the two.

[0016] Furthermore, the other end of the long groove includes a second deep groove distributed in a stepped manner with the shallow groove, and the other end of the current-carrying part is connected to a terminal block for forming a terminal block, and the terminal block is fixed on a wide surface of the current-carrying part facing the long groove, and one end of the terminal block connected to the current-carrying part is embedded and positioned in the second deep groove.

[0017] The advantage brought by the further arrangement is that the second deep groove can be embedded and positioned with one end of the terminal block, and the stepped structure between the shallow groove and the second deep groove can improve the positioning effect of the current-carrying part and the terminal block, making it less likely to shake. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of a circuit board according to an embodiment of the present invention;

[0019] Figure 2 An assembly diagram of a circuit board according to an embodiment of the present invention;

[0020] Figure 3 A structural diagram of a base shell according to an embodiment of the present invention;

[0021] Figure 4 is a structural diagram of a stationary contact assembly according to an embodiment of the present invention;

[0022] Figure 5 is a structural diagram of the current-carrying part and the first induction part of an embodiment of the present invention;

[0023] Figure 6 4 is a structural diagram of a moving contact assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] An embodiment of the contact structure of the circuit breaker of the present invention is as follows: Figure 1-6 As shown: it includes a base shell 1 and a static contact assembly 2 and a moving contact assembly 3 arranged on the base shell 1, wherein the static contact assembly 2 includes a current-carrying portion 21 and a first sensing portion 22 connected to the current-carrying portion 21, and a static contact piece 23 is arranged at the end of the first sensing portion 22, and the moving contact assembly 3 includes a contact support 31 and a moving contact 32 connected to the contact support 31, and the contact support 31 can drive the moving contact 32 to move together, and the moving contact 32 includes a second sensing portion 321, and the end of the second sensing portion 321 The movable contact piece 33 that cooperates with the static contact piece 23 to conduct electricity is welded and fixed to the movable contact assembly 3 and the static contact assembly 2. When the movable contact assembly 3 and the static contact assembly 2 are closed, the first sensing part 22 and the second sensing part 321 are close to each other and in a parallel state. The first sensing part 22 and the second sensing part 321 can adopt a straight long strip structure or an approximately straight long strip structure. The parallel state can refer to the first sensing part 22 and the second sensing part 321 being completely parallel, and also refers to an approximately parallel state. The closer the distance between the first sensing part 22 and the second sensing part 321 and the more they tend to be in a parallel state, the greater the electric repulsion generated between the contacts when the current passes between the two, and the electric repulsion can cause the two contacts to move quickly away from each other when they are tripped.

[0025] like Figure 4 , 5 As shown, the current-carrying part 21 is in a V-shaped structure, and the first sensing part 22 is connected to one end of the current-carrying part 21 and is arranged in the extension direction of one end of the current-carrying part 21, so that the end of the current-carrying part 21 close to the second sensing part 321 can also form an inductive match with the second sensing part 321 accordingly, thereby increasing the induction range, further increasing the generated electric repulsion, and improving the quick separation effect of the contacts.

[0026] The current-carrying part 21 and the first sensing part 22 are formed by bending the same flat metal profile, which is easy to manufacture and has low cost. Through the bending process, the current-carrying part 21 and the first sensing part 22 are arranged perpendicular to each other, that is, the plane where the wide side of the current-carrying part 21 (the flat structure has two oppositely arranged wide sides and two oppositely arranged narrow sides) is located and the plane where the wide side of the first sensing part 22 is located are arranged perpendicular to each other, one end of the first sensing part 22 is bent and connected to one end of the current-carrying part 21, and the wide side of the first sensing part 22 is arranged corresponding to the second sensing part 321, which can increase the sensing range of the electric repulsive force, and the other end of the first sensing part 22 is bent to form a connecting part 24 that cooperates with the static contact piece 23.

[0027] The connecting portion 24 is formed by bending one side to form a first welding surface 241 that is welded and fixed to the static contact piece 23. The other side of the connecting portion 24 opposite to the first welding surface 241 includes a second welding surface 242, and an arc-starting piece 4 is welded and fixed on the second welding surface 242. The connecting portion 24 also includes a third welding surface 243 adjacent to the first welding surface 241 and the second welding surface 242. The first welding surface 241 and the second welding surface 242 are both wide surfaces, and the third welding surface 243 is a narrow surface. One end of the arc-starting piece 4 is bent to form an L-shaped notch 41, and the inner walls on both sides of the L-shaped notch 41 are respectively welded and fixed to the second welding surface 242 and the third welding surface 243, which can increase the welding area of ​​the arc-starting piece 4 and the connecting portion 24 and improve the firmness of the connection.

[0028] The base shell 1 includes a long groove 11 for the static contact assembly 2 to be embedded and positioned, and a groove 12 arranged adjacent to the long groove 11. The long groove 11 is V-shaped as a whole. The middle part of the long groove 11 includes a shallow groove 111 for embedding and positioning with the current-carrying part 21. The bottom inner wall of the shallow groove 111 is arranged corresponding to the wide surface of the current-carrying part 21. One end of the long groove 11 includes a first deep groove 112 distributed in a stepped manner with the shallow groove 111. The first deep groove 112 is embedded and positioned with the first sensing part 22. The bottom inner wall of the first deep groove 112 is arranged corresponding to the narrow surface of the first sensing part 22. The moving contact assembly 3 is rotatably arranged in the groove 12.

[0029] The end of the first deep groove 112 is open, that is, the end of the first deep groove 112 has an opening connected to the groove 12, the connecting portion 24 and the static contact piece 23 extend from the end of the first deep groove 112, and a retaining wall 13 is formed on one side of the first deep groove 112. The retaining wall 13 can separate the first sensing portion 22 and the second sensing portion 321 to prevent the generation of an arc. The first sensing portion 22 and the second sensing portion 321 are respectively located on both sides of the retaining wall 13, and the second sensing portion 321 has an arc-shaped convex portion 3211 on a side corresponding to the first sensing portion 22, and the retaining wall 13 is provided with an arc-shaped concave portion 131 that matches the shape of the arc-shaped convex portion 3211 on a side corresponding to the second sensing portion 321, so that the first sensing portion 22 and the second sensing portion 321 can be as close as possible when the contacts are closed, and the sensing range of both is improved.

[0030] The other end of the long groove 11 includes a second deep groove 113 which is distributed in a stepped manner with the shallow groove 111. The other end of the current-carrying part 21 is connected to a terminal block 5 for forming a terminal block. The terminal block 5 is fixed on a wide side of the current-carrying part 21 facing the long groove 11 by welding or riveting, and can just fit in the stepped structure between the second deep groove 113 and the shallow groove 111. The end of the terminal block 5 connected to the current-carrying part 21 is embedded and positioned in the second deep groove 113.

[0031] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A contact structure of a circuit breaker, comprising a base shell and a moving contact assembly and a stationary contact assembly arranged on the base shell, characterized in that: The static contact assembly includes a current-carrying part and a first sensing part connected to the current-carrying part, and a static contact piece is arranged at the end of the first sensing part; the moving contact assembly includes a contact support and a moving contact connected to the contact support; the moving contact includes a second sensing part, and a moving contact piece is arranged at the end of the second sensing part; when the moving contact assembly and the static contact assembly are closed, the first sensing part and the second sensing part are close to each other and in a parallel state; The current-carrying portion is in a V-shaped structure, and the first sensing portion is connected to one end of the current-carrying portion and is arranged toward the extension direction of the one end of the current-carrying portion; The current-carrying part and the first sensing part are formed by bending the same flat metal profile, the current-carrying part and the first sensing part are arranged perpendicular to each other, one end of the first sensing part is bent and connected to one end of the current-carrying part, the wide surface of the first sensing part is arranged corresponding to the second sensing part, and the other end of the first sensing part is bent to form a connecting part that cooperates with the static contact piece; The base shell includes a long groove for the static contact assembly to be embedded and positioned, and a groove arranged adjacent to the long groove. The long groove is V-shaped as a whole. The middle of the long groove includes a shallow groove for embedding and positioning with the current-carrying part. One end of the long groove includes a first deep groove distributed in a stepped manner with the shallow groove. The first deep groove is embedded and positioned with the first induction part. The moving contact assembly is arranged in the groove. The end of the first deep groove is open, the connecting portion and the static contact sheet extend from the end of the first deep groove, a retaining wall is formed on one side of the first deep groove, the first sensing portion and the second sensing portion are respectively located on both sides of the retaining wall, the second sensing portion has an arc-shaped convex portion on a side corresponding to the first sensing portion, and the retaining wall is provided with an arc-shaped concave portion that matches the shape of the arc-shaped convex portion on a side corresponding to the second sensing portion; The other end of the long groove includes a second deep groove distributed in a stepped manner with the shallow groove. The other end of the current-carrying part is connected to a terminal block for forming a terminal block. The terminal block is fixed on a wide side of the current-carrying part facing the long groove. The end of the terminal block connected to the current-carrying part is embedded and positioned in the second deep groove.

2. The contact structure of the circuit breaker according to claim 1, characterized in that: One side of the connecting part includes a first welding surface which is welded and fixed to the static contact piece, and the other side of the connecting part opposite to the first welding surface includes a second welding surface, and an arc-starting piece is welded and fixed on the second welding surface. The connecting part also includes a third welding surface adjacent to the first welding surface and the second welding surface, and one end of the arc-starting piece is bent to form an L-shaped notch, and the inner walls on both sides of the L-shaped notch are respectively welded and fixed to the second welding surface and the third welding surface.

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