A circuit breaker N pole active arc initiation contact mechanism

Abstract

The utility model relates to a kind of circuit breaker N pole active arc leading contact mechanism, including shell, N pole contact subassembly in being arranged in shell, N pole contact subassembly includes: with the contact seat of handle linkage;Fixed in the contact seat movable contact;With movable contact cooperation static contact;Arc leading piece located in the side of movable contact away from static contact, arc leading piece and movable contact are electrically connected by conductive soft connecting piece and form low impedance path that electric arc can be transferred to arc leading piece;Static contact includes incoming line connecting arm and the contact arm formed by the upward bending of incoming line connecting arm;Contact arm is equipped with hollow slot and the extension arm formed by the downward extension in hollow slot, extension arm is equipped with silver contact point with movable contact cooperation on-off, the utility model circuit breaker can effectively lead down and discharge in small space, reduce the damage of electric arc to movable contact.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to an active arc-initiating contact mechanism for the N-pole of a circuit breaker. Background Technology

[0002] In compact 3P+N circuit breaker products, the introduction of the N-pole contact protection mechanism results in a severe lack of lateral space: the arc is difficult to effectively conduct within the confined space and is prone to stagnation between the moving and stationary contacts, causing ablation. In particular, current arc ignition schemes cannot achieve directional and rapid downward movement of the arc in narrow spaces, exacerbating the risk of contact damage. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a circuit breaker N-pole active arc-initiating contact mechanism.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a circuit breaker N-pole active arc-initiating contact mechanism, comprising a housing and an N-pole contact assembly disposed within the housing. The N-pole contact assembly includes: a contact seat linked to a handle; a moving contact fixed to the contact seat; a stationary contact cooperating with the moving contact; and an arc-initiating plate located on the side of the moving contact facing away from the stationary contact. The arc-initiating plate and the moving contact are electrically connected via a conductive flexible connector to form a low-impedance path through which the arc can be transferred to the arc-initiating plate. The stationary contact includes an inlet connecting arm and a contact arm formed by bending the inlet connecting arm upward. The contact arm has a hollow groove and an extension arm extending downward within the hollow groove. The extension arm has a silver contact point that cooperates with the moving contact to open and close the circuit.

[0005] As a preferred embodiment of this utility model, the width of the extension arm is smaller than the width of the hollow groove, and the two sides of the extension arm form a gap fit with the inner wall of the hollow groove.

[0006] As a preferred embodiment of this utility model, the conductive flexible connector includes: a first connecting section bridging the moving contact and the arc-inducing plate; and a second connecting section extending from the arc-inducing plate to the terminal block.

[0007] As a preferred technical solution of this utility model, a wire outlet channel is reserved between the moving contact and the inner wall of the housing, and the second connecting section passes through the wire outlet channel to connect to the terminal block.

[0008] As a preferred embodiment of this utility model, the arc-initiating plate and the stationary contact are housed in an independent arc-extinguishing chamber, which includes: a movable hole at the top for the moving contact to swing and extend into; and an exhaust channel at the bottom for discharging the electric arc and high-temperature gas.

[0009] As a preferred technical solution of this utility model, the exhaust channel includes a first exhaust hole and a second exhaust hole located on both sides of the bottom wall of the arc extinguishing chamber.

[0010] As a preferred embodiment of the present invention, the contact seat is provided with a gas blocking boss, which is located outside the movable hole and directly opposite the stationary contact.

[0011] As a preferred technical solution of this utility model, the inner wall of the arc extinguishing chamber is provided with creepage reinforcement ribs, which are located between the arc-initiating plate and the stationary contact and are offset from the closing trajectory plane of the moving and stationary contacts.

[0012] As a preferred technical solution of this utility model, the arc extinguishing chamber is provided with: a first positioning groove for fixing the arc-starting plate; and a second positioning groove for fixing the stationary contact.

[0013] In summary, the beneficial effects of this utility model are as follows: This application uses a conductive flexible connector to directly connect the moving contact and the arc-initiating plate, and then welds them to the terminal block (corresponding to the N-pole output), so that the arc-initiating plate and the moving contact become an equipotential point, which is conducive to the arc being drawn downward more easily. Through the active arc-initiating contact mechanism, the arc can be effectively drawn downward and discharged in a compact space, reducing the damage of the arc to the moving contact. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the circuit breaker housing of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the stationary contact in this utility model;

[0017] Figure 4 This is a schematic diagram of the current direction of the stationary and moving contacts in this utility model;

[0018] Figure 5 This is a cross-sectional view of the longitudinal section of the circuit breaker of this utility model;

[0019] Figure 6 This is a schematic diagram of the contact seat in this utility model.

[0020] Reference numerals: 1. Housing; 2. N-pole contact assembly; 3. Contact base; 4. Moving contact; 5. Stationary contact; 6. Arc ignition plate; 7. Conductive flexible connector; 8. Inlet connection arm; 9. Contact arm; 10. Hollowed-out groove; 11. Extension arm; 12. Silver contact; 13. First connecting section; 14. Second connecting section; 15. Outlet channel; 16. Arc extinguishing chamber; 17. Movable hole; 18. Exhaust channel; 19. First exhaust hole; 20. Second exhaust hole; 21. Gas blocking boss; 22. Creepage reinforcement rib; 23. First positioning groove; 24. Second positioning groove. Detailed Implementation

[0021] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0022] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0023] like Figure 1-6 The circuit breaker N-pole active arc-initiating contact mechanism shown includes a housing 1 and an N-pole contact assembly 2 disposed within the housing 1. The N-pole contact assembly 2 includes: a contact seat 3 linked to a handle; a moving contact 4 fixed to the contact seat 3; a stationary contact 5 cooperating with the moving contact 4; and an arc-initiating plate 6 located on the side of the moving contact 4 facing away from the stationary contact 5. The arc-initiating plate 6 and the moving contact 4 are electrically connected via a conductive flexible connector 7 to form a low-impedance path for the arc to transfer to the arc-initiating plate 6. The stationary contact 5 includes an inlet connecting arm 8 and an inlet connecting arm 8 (N-pole inlet) bent upward to form a contact arm 9. The contact arm 9 is provided with a hollow groove 10 and a downwardly extending part located within the hollow groove 10. The extension arm 11 is provided with silver contacts 12 that cooperate with the moving contact 4 to open and close the circuit. The width of the extension arm 11 is smaller than the width of the hollow groove 10, and the two sides of the extension arm 11 form a gap fit with the inner wall of the hollow groove 10. The arc-initiating contact mechanism of this embodiment is applicable to 3P+N circuit breakers. At the same time, any circuit breaker that adopts the same active arc control principle, including but not limited to: single-pole circuit breakers (including N pole or phase pole); disconnecting switches; DC circuit breakers; any application of the arc-initiating contact mechanism of this application in the contact mechanism is within the scope of protection of this patent. The working principle of the N pole contact assembly 2 in this application is the same as that of existing contact assemblies, and this application will not elaborate on it.

[0024] A slot 10 is provided on the contact arm 9, with an extension arm 11 in the middle and a silver contact 12 on the extension arm 11. When current comes from the input end, it first goes up through the contact arm 9 to the top, then down to the silver contact 12, and finally through the silver contact 12 to the moving contact 4. The current flow is as follows. Figure 4 As shown, the advantage of this setup is that it creates a downward electrodynamic force in the direction of current flow, which can provide power for the downward movement of the electric arc.

[0025] This application uses a conductive flexible connector 7 to directly connect the contact 4 and the arc-starting plate 6, and then welds them to the terminal block (corresponding to the N-pole output), so that the arc-starting plate 6 and the moving contact 4 become an equipotential point, which is conducive to the arc being drawn downward more easily. Through the active arc-starting contact mechanism, the arc can be effectively drawn downward and discharged in a compact space, reducing the damage of the arc to the moving contact 4.

[0026] The conductive flexible connector 7 includes: a first connecting section 13 bridging the moving contact 4 and the arc-inducing plate 6; and a second connecting section 14 extending from the arc-inducing plate 6 to the terminal block.

[0027] A wire outlet channel 15 is reserved between the moving contact 4 and the inner wall of the housing 1, and the second connecting section 14 passes through the wire outlet channel 15 and connects to the terminal block.

[0028] The arc-starting plate 6 and the stationary contact 5 are housed in an independent arc-extinguishing chamber 16. The arc-extinguishing chamber 16 includes: a movable hole 17 at the top for the moving contact 4 to swing and extend into; and an exhaust channel 18 at the bottom for discharging the electric arc and high-temperature gas. In this embodiment, the exhaust channel 18 includes a first exhaust hole 19 and a second exhaust hole 20 on both sides of the bottom wall of the arc-extinguishing chamber 16, which allows the generated gas to be discharged smoothly. At the same time, the downward-moving gas can also provide power for the downward movement of the electric arc. The two exhaust holes are located on both sides (corresponding to the arc-starting plate 6 and the stationary contact 5, respectively), to prevent the discharged gas and electric arc from being directly ejected, and also to increase the creepage distance. In this embodiment, the arc-extinguishing chamber 16 is provided with a first positioning groove 23 for fixing the arc-starting plate 6 and a second positioning groove 24 for fixing the stationary contact 5.

[0029] The contact seat 3 is provided with a gas blocking boss 21, which is located outside the movable hole 17 and directly opposite the stationary contact 5 to prevent the gas generated when the contact breaks from moving upward.

[0030] The inner wall of the arc extinguishing chamber 16 is provided with creepage reinforcement ribs 22. The creepage reinforcement ribs 22 are located between the arc ignition plate 6 and the stationary contact 5 and are offset from the closing trajectory plane of the moving and stationary contacts 5 (i.e., the misaligned closing trajectory plane will not interfere with the movement). This can increase the creepage distance between the moving contact 4 and the stationary contact 5 and reduce the risk of withstand voltage breakdown.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as defined by the appended claims and their equivalents.

Claims

1. A circuit breaker N-pole active arc-ignition contact mechanism, comprising a housing (1) and an N-pole contact assembly (2) disposed within the housing (1), the N-pole contact assembly (2) comprising: Contact seat (3) linked to the handle; movable contact (4) fixed to contact seat (3); A stationary contact (5) that cooperates with the moving contact (4); an arc-guiding plate (6) located on the side of the moving contact (4) facing away from the stationary contact (5), characterized in that: the arc-guiding plate (6) and the moving contact (4) are electrically connected by a conductive flexible connector (7) to form a low-impedance path through which the arc can be transferred to the arc-guiding plate (6); the stationary contact (5) includes an inlet connecting arm (8) and a contact arm (9) formed by bending the inlet connecting arm (8) upward; the contact arm (9) is provided with a hollow groove (10) and an extension arm (11) that extends downward within the hollow groove (10), and the extension arm (11) is provided with a silver contact (12) that cooperates with the moving contact (4) to switch on and off.

2. The circuit breaker N-pole active arc-starting contact mechanism according to claim 1, characterized in that: The width of the extension arm (11) is smaller than the width of the hollow groove (10), and the two sides of the extension arm (11) form a clearance fit with the inner wall of the hollow groove (10).

3. The circuit breaker N-pole active arc-starting contact mechanism according to claim 1, characterized in that: The conductive flexible connector (7) includes: a first connecting section (13): bridging the moving contact (4) and the arc-starting plate (6); and a second connecting section (14): extending from the arc-starting plate (6) to the terminal block.

4. The circuit breaker N-pole active arc-starting contact mechanism according to claim 3, characterized in that: A wire outlet channel (15) is reserved between the moving contact (4) and the inner wall of the housing (1), and the second connecting section (14) passes through the wire outlet channel (15) and connects to the terminal block.

5. The circuit breaker N-pole active arc-starting contact mechanism according to claim 1, characterized in that: The arc-starting plate (6) and the stationary contact (5) are housed in an independent arc-extinguishing chamber (16), which includes: a movable hole (17) at the top for the moving contact (4) to swing and extend into; and an exhaust channel (18) at the bottom for the discharge of electric arc and high-temperature gas.

6. The circuit breaker N-pole active arc-starting contact mechanism according to claim 5, characterized in that: The exhaust channel (18) includes a first exhaust port (19) and a second exhaust port (20) located on both sides of the bottom wall of the arc extinguishing chamber (16).

7. The circuit breaker N-pole active arc-starting contact mechanism according to claim 5, characterized in that: The contact seat (3) is provided with a gas blocking boss (21), which is located outside the movable hole (17) and directly opposite the stationary contact (5).

8. The circuit breaker N-pole active arc-starting contact mechanism according to claim 5, characterized in that: The inner wall of the arc extinguishing chamber (16) is provided with creepage reinforcement ribs (22), which are located between the arc-starting plate (6) and the stationary contact (5) and are offset from the closing trajectory plane of the moving and stationary contacts (5).

9. The circuit breaker N-pole active arc-starting contact mechanism according to any one of claims 5-8, characterized in that: The arc extinguishing chamber (16) is provided with: a first positioning groove (23) for fixing the arc-starting plate (6); and a second positioning groove (24) for fixing the stationary contact (5).

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