A circuit breaker N-pole arc striking mechanism

Abstract

The utility model relates to a circuit breaker N pole arc drawing mechanism, including casing, N pole contact subassembly, the N pole contact subassembly includes: with the contact seat of handle linkage, the movable contact of fixed in contact seat, the arc drawing piece is located movable contact side and is directly connected with movable contact through the soft connecting piece and static contact, static contact includes: the incoming line connecting arm: connects the incoming line terminal, the contact arm: the bending formation from the incoming line connecting arm upward, the U-shaped conductive arm: the bending formation from the contact arm end to movable contact direction, and its opening faces downward, the silver contact point: is located in the U-shaped conductive arm face side movable contact, the utility model circuit breaker can let arc effectively draw down and discharge in the narrow space, reduces the damage of arc to movable contact.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a circuit breaker N-pole arc ignition mechanism. 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 arc ignition mechanism.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a circuit breaker N-pole arc-starting mechanism, comprising a housing and an N-pole contact assembly. The N-pole contact assembly includes: a contact seat linked to a handle; a moving contact fixed to the contact seat; and an arc-starting plate located on the side of the moving contact facing away from the stationary contact and directly connected to the moving contact via a flexible connector. The stationary contact includes: an inlet connecting arm connected to an inlet terminal; a contact arm formed by bending upward from the inlet connecting arm; a U-shaped conductive arm formed by bending from the end of the contact arm toward the moving contact, with its opening facing downward; and a silver contact point located on the side of the U-shaped conductive arm facing the moving contact.

[0005] As a preferred technical solution of this utility model, the flexible connector includes: a first connecting section bridging the moving contact and the arc-guiding plate; and a second connecting section extending from the arc-guiding plate to the outgoing end.

[0006] As a preferred technical solution of this utility model, the shell is assembled from multiple modular compartments, including: an N-pole contact isolation chamber with an independent arc-extinguishing cavity; multiple L-pole contact isolation chambers; wherein the arc-initiating plate and the stationary contact are housed in the arc-extinguishing cavity, and the arc-extinguishing cavity is provided with: a top swing hole for the moving contact to swing and insert; and a bottom exhaust channel for discharging the electric arc and high-temperature gas.

[0007] As a preferred technical solution of this utility model, the bottom exhaust channel includes: an air guide groove: located at the lower part of the N-pole contact isolation chamber; an exhaust chamber: located on the left side of the adjacent L-pole contact isolation chamber, and connected to the arc extinguishing chamber through the air guide groove; and an exhaust hole: opened at the bottom of the exhaust chamber.

[0008] As a preferred embodiment of the present invention, the contact seat is provided with a gas blocking boss, which is located outside the swing hole and directly opposite the stationary contact.

[0009] As a preferred technical solution of this utility model, the inner wall of the arc extinguishing cavity 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.

[0010] As a preferred technical solution of this utility model, the arc extinguishing cavity is provided with: a slot for fixing the position of the arc-initiating plate; and a positioning slot for constraining the lateral displacement of the stationary contact.

[0011] In summary, the beneficial effects of this utility model are as follows: This application uses a flexible connector to directly connect the contact and the arc-initiating plate, and then welds them to the terminal block (corresponding to the N-pole output terminal), 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

[0012] Figure 1 This is a schematic diagram of the internal structure of the N-pole contact isolation chamber in this utility model; Figure 2 This is a schematic diagram of the structure of the N-pole contact isolation chamber in this utility model; Figure 3 This is a schematic diagram of the structure of the L-pole contact isolation chamber in this utility model; Figure 4 This is a schematic diagram of the structure of the stationary contact in this utility model; Figure 5 This is a schematic diagram of the current direction of the stationary and moving contacts in this utility model; Figure 6 This is a cross-sectional view of the longitudinal section of the circuit breaker of this utility model; Figure 7 This is a schematic diagram of the moving contact in this utility model.

[0013] Reference numerals: 1. Housing; 2. N-pole contact assembly; 3. Contact base; 4. Moving contact; 5. Stationary contact; 6. Arc ignition plate; 7. Flexible connector; 8. Inlet connection arm; 9. Contact arm; 10. U-shaped conductive arm; 11. Silver contact; 12. First connecting section; 13. Second connecting section; 14. Compartment; 15. N-pole contact isolation chamber; 16. Arc extinguishing chamber; 17. L-pole contact isolation chamber; 18. Swing hole; 19. Exhaust channel; 20. Gas guide groove; 21. Exhaust chamber; 22. Gas blocking boss; 23. Creepage reinforcement rib; 24. Slot; 25. Positioning slot; 26. Exhaust hole. Detailed Implementation

[0014] 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.

[0015] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0016] like Figure 1-7 The circuit breaker N-pole arc ignition mechanism shown includes a housing 1 and an N-pole contact assembly 2. 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; and an arc ignition plate 6 located on the side of the moving contact 4 facing away from the stationary contact 5 and directly connected to the moving contact 4 via a flexible connector 7. The stationary contact 5 includes: an inlet connecting arm 8 for connecting to an inlet terminal; a contact arm 9 formed by bending upward from the inlet connecting arm 8; a U-shaped conductive arm 10 formed by bending from the end of the contact arm 9 toward the moving contact 4, with its opening facing downward; and a silver contact 11 disposed on the U-shaped conductive arm 10. On the side of the moving contact 4, 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 will not be specifically described in this application. In circuit breakers, the L pole and P pole refer to the same electrical polarity (live wire pole) in most cases.

[0017] The incoming line connecting arm 8 (corresponding to the N-pole incoming line) is first bent upwards until it is higher than the moving contact 4, and then a U-shaped conductive arm 10 is formed. A silver contact 11 is provided on the side of the U-shaped conductive arm 10 facing the moving contact 4. When the current comes from the incoming line end, it first goes up through the incoming line connecting arm 8 to the top, then goes down through the U-shaped conductive arm 10 to the silver contact 11, and finally reaches the moving contact 4 through the silver contact. The current flow is as follows. Figure 5 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.

[0018] This application uses a 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 terminal), 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.

[0019] The flexible connector 7 includes: a first connecting section 12 bridging the moving contact 4 and the arc-starting piece 6; and a second connecting section 13 extending from the arc-starting piece 6 through the zero-sequence current transformer to the outgoing terminal.

[0020] The housing 1 is assembled from multiple modular compartments 14, including: an N-pole contact isolation chamber 15 with an independent arc-extinguishing cavity 16; and multiple L-pole contact isolation chambers 17. The arc-initiating plate 6 and the stationary contact 5 are housed within the arc-extinguishing cavity 16. The arc-extinguishing cavity 16 is provided with: a top swing hole 18 for the moving contact 4 to swing and insert; a bottom exhaust channel 19 for discharging the electric arc and high-temperature gas; and the arc-extinguishing cavity 16 is provided with: a slot 24 for fixing the position of the arc-initiating plate 6; and a positioning groove 25 for constraining the lateral displacement of the stationary contact 5.

[0021] The bottom exhaust channel 19 includes: an air guide groove 20 located at the lower part of the N-pole contact isolation chamber 15; an exhaust chamber 21 located on the left side of the adjacent L-pole contact isolation chamber 17 and connected to the arc extinguishing chamber 16 through the air guide groove 20; an exhaust hole 26 located at the bottom of the exhaust chamber 21; and a gas blocking boss 22 provided on the contact seat 3, which is located outside the swing hole 18 and directly opposite the stationary contact 5.

[0022] The contact seat 3 is provided with a gas-blocking protrusion 22 to prevent the gas generated during contact breaking from moving upward. Simultaneously, the inner wall of the N-pole contact isolation chamber 15 is provided with a gas guide groove 20. The generated gas enters the lower exhaust chamber 21 through the gas guide groove 20, and then exits through the exhaust hole 26 at the bottom of the exhaust chamber 21. The downward-moving gas also provides power for the downward movement of the arc. The advantage of this exhaust method is that it does not require reducing the area of ​​the stationary contact 5 to accommodate the exhaust hole 26, and it can increase the electrical clearance between different poles.

[0023] The inner wall of the arc extinguishing cavity 16 is provided with creepage reinforcement rib 23. Creepage reinforcement rib 23 is located between the arc ignition plate 6 and the stationary contact 5 and is offset from the closing trajectory plane of the moving and stationary contacts 5 (i.e., the misaligned closing trajectory plane, which will not interfere with the movement). It can increase the creepage distance between the moving contact 4 and the stationary contact 5 and reduce the risk of withstand voltage breakdown.

[0024] 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 arc ignition mechanism, comprising a housing (1) and an N-pole contact assembly (2), wherein the N-pole contact assembly (2) comprises: A contact seat (3) linked to the handle; a moving contact (4) fixed to the contact seat (3); an arc-starting plate (6) located on the side of the moving contact (4) facing away from the stationary contact (5) and directly connected to the moving contact (4) through a flexible connector (7), characterized in that: the stationary contact (5) includes: an inlet connecting arm (8): connecting to the inlet terminal; a contact arm (9): formed by bending upward from the inlet connecting arm (8); a U-shaped conductive arm (10): formed by bending from the end of the contact arm (9) toward the moving contact (4), with its opening facing downward; and a silver contact (11): located on the side of the U-shaped conductive arm (10) facing the moving contact (4).

2. The arc-starting mechanism for the N-pole of a circuit breaker according to claim 1, characterized in that: The flexible connector (7) includes: a first connecting section (12): bridging the moving contact (4) and the arc-starting plate (6); and a second connecting section (13): extending from the arc-starting plate (6) to the outgoing end.

3. The arc-starting mechanism for the N-pole of the circuit breaker according to claim 1, characterized in that: The housing (1) is assembled from multiple modular compartments (14), including: an N-pole contact isolation chamber (15) with an independent arc-extinguishing cavity (16); multiple L-pole contact isolation chambers (17); wherein the arc-initiating plate (6) and the stationary contact (5) are housed in the arc-extinguishing cavity (16), and the arc-extinguishing cavity (16) is provided with: a top swing hole (18) for the moving contact (4) to swing and insert; and a bottom exhaust channel (19) for the discharge of electric arc and high-temperature gas.

4. The arc-starting mechanism for the N-pole of the circuit breaker according to claim 3, characterized in that: The bottom exhaust channel (19) includes: an air guide groove (20): located at the lower part of the N pole contact isolation chamber (15); an exhaust chamber (21): located on the left side of the adjacent L pole contact isolation chamber (17), and connected to the arc extinguishing chamber (16) through the air guide groove (20); and an exhaust hole (26): located at the bottom of the exhaust chamber (21).

5. The arc-starting mechanism for the N-pole of a circuit breaker according to claim 3, characterized in that: The contact seat (3) is provided with a gas blocking boss (22), which is located outside the swing hole (18) and directly opposite the stationary contact (5).

6. The arc-starting mechanism for the N-pole of a circuit breaker according to claim 3, characterized in that: The inner wall of the arc extinguishing cavity (16) is provided with creepage reinforcement ribs (23), 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).

7. The arc-starting mechanism for the N-pole of a circuit breaker according to any one of claims 3-6, characterized in that: The arc extinguishing cavity (16) is provided with: a slot (24) to fix the position of the arc-starting piece (6); and a positioning slot (25) to constrain the lateral displacement of the stationary contact (5).

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