A parallel-arranged arc-starting system and circuit breaker

By designing a parallel arc-induced arc system in a low-voltage circuit breaker, using multiple parallel arc-extinguishing chambers and arc-induced arc channels, the problem of insufficient arc voltage of the low-voltage circuit breaker under a limited volume is solved, and higher arc voltage and arc-extinguishing efficiency is achieved, and it is suitable for circuit breakers of high voltage levels.

CN222705424UActive Publication Date: 2025-04-01XIAN LINGYI INTELLIGENT ELECTRIC CO LTD
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Patent Information

Application Number
CN202421240125.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-31
Publication Date
2025-04-01
Estimated Expiration
2034-05-31

AI Technical Summary

Technical Problem

It is difficult for existing low-voltage circuit breakers to significantly increase the arc voltage under limited volume sizes, especially in AC and DC low-voltage circuit breakers. The arc voltage is insufficient when the fault current is broken, which affects the arc extinguishing efficiency.

Method used

A parallel arc-induced arc-induced channel system is designed. By setting two parallel arc-induced arc-induced chambers between the dynamic arc-angle angle and the static contact, and setting the arc-induced arc-induced sections between the arc-induced chambers, two pairs of series and parallel arc-induced channels are formed to increase the arc voltage.

Benefits of technology

At the same circuit breaker arc extinguishing chamber height, twice the arc extinguishing chamber height is achieved, increasing the number of grids, thereby providing higher arc voltage, suitable for AC and DC circuit breakers of higher voltage levels, improving arc extinguishing efficiency and arc voltage.

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Abstract

The utility model discloses an arc-striking system and a circuit breaker arranged in parallel, comprising an arc-striking chamber, an arc-striking piece, a moving contact, a static contact, a moving arc angle and a static arc angle; two arc-striking chambers are arranged in parallel and spaced apart, and are located between the moving arc angle and the static contact, and the static arc angle and the static contact have the same potential; the arc-striking piece comprises an arc-striking portion, a first arc-striking portion and a second arc-striking portion, the arc-striking portion is located on the motion trajectory of the moving contact, the arc-striking portion connects the first arc-striking portion and the second arc-striking portion, the end of the first arc-striking portion is located at the upper end of the first arc-striking chamber, the end of the second arc-striking portion is located at the lower end of the second arc-striking chamber, and the arc-striking portion is used to introduce the arc generated by the moving contact opening into the arc-striking chamber; the arc-striking system obtains twice the arc-striking chamber height under the same circuit breaker arc-striking chamber height, that is, twice the number of grid pieces can be set, and when the arc enters the two arc-striking chambers, a higher arc voltage can be provided, which effectively acts on the arc-striking systems of AC and DC circuit breakers with higher voltage levels.
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Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to arc extinguishing technology of low-voltage electrical appliances, and in particular to an arc striking system arranged in parallel. Background Art

[0002] Low-voltage molded case circuit breakers are widely used in the control and protection of low-voltage power distribution systems. When circuit breakers break fault currents, they usually have a current limiting capability requirement. Low-voltage circuit breakers limit fault currents by increasing the arc voltage. On the other hand, DC low-voltage circuit breakers break fault currents and require an arc voltage that exceeds the system voltage. Therefore, increasing the arc voltage of the circuit breaker is a key point for AC and DC low-voltage circuit breakers, and significantly increasing the arc voltage under limited volume is a technical difficulty in this field. Utility Model Content

[0003] In view of the problems existing in the prior art, the task of the utility model is to provide a parallel-arranged arc striking system that can effectively increase the arc voltage.

[0004] The utility model is realized by the following technical solutions:

[0005] An arc striking system arranged in parallel, comprising an arc extinguishing chamber, an arc striking piece, a moving contact, a stationary contact, a moving arc angle and a stationary arc angle;

[0006] The two arc extinguishing chambers are arranged in parallel and spaced apart and are located between the moving arc angle and the stationary contact, and the stationary arc angle and the stationary contact are fixedly connected to the same potential;

[0007] The arc-striking piece includes an arc-striking portion, a first arc-striking portion and a second arc-striking portion. The arc-striking portion is located on the movement trajectory of the moving contact. The arc-striking portion connects the first arc-striking portion and the second arc-striking portion. The end of the first arc-striking portion is located at the upper end of the first arc-extinguishing chamber, and the second arc-striking portion is located at the lower end of the second arc-extinguishing chamber. The arc-striking portion is used to introduce the arc generated by the opening of the moving contact into the arc-extinguishing chamber.

[0008] Preferably, the arc-striking portion is located in the middle between the two arc-extinguishing chambers, one end of the first arc-striking portion and the second arc-striking portion are connected to the arc-striking portion, the other end of the first arc-striking portion is suspended at the top of the first arc-extinguishing chamber, and the other end of the second arc-striking portion is arranged at the bottom of the second arc-extinguishing chamber, and the arc-striking portion is insulated and connected to the arc-extinguishing chamber.

[0009] Preferably, the arc striking portion includes an arc driving portion and an arc burning portion;

[0010] One end of the arc driving portion is connected to the arc striking portion, and the other end extends to the end of the arc extinguishing chamber. The arc burning portion is arranged at the end of the arc driving portion and extends to the end of the arc extinguishing chamber.

[0011] Preferably, the first arc-striking portion and the second arc-striking portion are covered with an insulating layer on one side away from the arc-extinguishing chamber.

[0012] Preferably, the static arc angle is located at the bottom of the first arc extinguishing chamber, and the static arc angle and the first arc striking portion form a first arc striking channel in the first arc extinguishing chamber;

[0013] The moving arc angle is suspended on the top of the second arc extinguishing chamber, and the moving arc angle and the second arc striking portion form a second arc striking channel in the second arc extinguishing chamber.

[0014] Preferably, the moving contact is rotatably arranged between a moving arc angle and a static arc angle, and the arcing portion is located between the moving arc angle and the static arc angle.

[0015] Preferably, the moving arc angle is fixed on the top of the second arc extinguishing chamber and connected to the moving contact through a wire.

[0016] Preferably, the arc extinguishing chamber comprises an insulating plate and a grid, the two insulating plates are arranged vertically and spaced apart, and a plurality of L-shaped grids are spaced apart from top to bottom between the two insulating plates.

[0017] Preferably, a metal magnetic conductive sheet is provided between the two arc extinguishing chambers for shielding the electromagnetic effect between the arcs in the two arc extinguishing chambers.

[0018] A circuit breaker comprises the aforementioned arc striking systems arranged in parallel.

[0019] Compared with the prior art, the utility model has the following beneficial technical effects:

[0020] The utility model provides an arc-striking system arranged in parallel, wherein two arc-extinguishing chambers arranged in parallel are arranged between a moving arc angle and a static contact, an arc-striking portion of an arc-striking piece is arranged between the arc-extinguishing chambers and on the moving trajectory of the moving contact, the arc-striking portions at both ends of the arc-striking piece extend to the upper and lower ends of the two arc-extinguishing chambers respectively, and the moving arc angle and the static arc angle are arranged at the ends of the two arc-extinguishing chambers respectively, thereby forming two pairs of arc-striking channels connected in series and arranged in parallel by the moving arc angle, the static arc angle and the two arc-striking portions, the arc generated during the action of the moving contact is introduced by the arc-striking portion, and the arc root enters the arc-striking channel through the two arc-striking portions for arc extinguishing respectively; the arc-striking system obtains twice the arc-extinguishing chamber height under the same arc-extinguishing chamber height of the circuit breaker, that is, twice the number of grid plates can be arranged, and when the arc enters the two arc-extinguishing chambers, a higher arc voltage can be provided, effectively acting on the arc-extinguishing systems of AC and DC circuit breakers with higher voltage levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an appearance diagram of the arc striking system arranged in parallel in the utility model;

[0022] Figure 2 It is a structural diagram of the arc striking system arranged in parallel in the utility model;

[0023] Figure 3It is a schematic diagram of the parallel arrangement of the arc extinguishing hoods of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the arc extinguishing chamber of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the arc-starting piece of the utility model;

[0026] Figure 6 It is a structural schematic diagram of the arc striking part of the utility model.

[0027] In the figure: moving contact 1, stationary contact 2, moving arc angle 3, stationary arc angle 4, arc striking piece 5, first arc extinguishing chamber 6, second arc extinguishing chamber 7; first arc striking channel 8, second arc striking channel 9, magnetic conductive piece 10, arc striking part 501, first arc striking part 502, second arc striking part 503, arc driving part 50201 and arc burning part 50202 arc driving part 50301 and arc burning part 50302 first arc striking part arc burning part 50202 DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0029] See also Figure 1-6 , an arc striking system arranged in parallel, comprising an arc extinguishing chamber, an arc striking piece 5, a moving contact 1, a stationary contact 2, a moving arc angle 3 and a stationary arc angle 4;

[0030] Two arc extinguishing chambers are arranged in parallel and spaced apart, and are located between the moving arc angle 3 and the static contact 2, and the static arc angle 4 is fixedly connected to the static contact 2 at the same potential; the arc striking piece includes an arc striking portion 501, a first arc striking portion 502 and a second arc striking portion 503, the arc striking portion is located on the movement trajectory of the moving contact 1, the arc striking portion connects the first arc striking portion 502 and the second arc striking portion 503, the end of the first arc striking portion is located at the upper end of the first arc extinguishing chamber 6, and the second arc striking portion is located at the lower end of the second arc extinguishing chamber 7, and the arc striking portion is used to introduce the arc generated by the opening of the moving contact into the arc extinguishing chamber.

[0031] The arc-striking part of the arc extinguishing system is located on the running track of the moving contact. The moving contact generates an arc during the opening process. The arc is introduced into the two arc-starting parts through the arc-striking part, and enters the two arc-extinguishing chambers through the two arc-starting parts. When the arc enters the two arc-extinguishing chambers, a higher arc voltage can be provided, which can effectively act on the arc extinguishing systems of AC and DC circuit breakers with higher voltage levels.

[0032] See also Figure 5 and 6The arc-striking piece 5 includes an arc-striking portion 501, a first arc-striking portion 502 and a second arc-striking portion 503. The arc-striking portion 501 is located at the vertical center position between the two arc-extinguishing chambers. One end of the first arc-striking portion 502 is connected to one side of the arc-striking portion 501, and the other end of the first arc-striking portion 502 extends upward and is suspended at the top of the first arc-extinguishing chamber; one end of the second arc-striking portion 503 is connected to the other side of the arc-striking portion 501, and the other end of the second arc-striking portion 503 extends downward, and the lower end of the second arc-striking portion 503 is suspended at the bottom of the second arc-extinguishing chamber, and the arc-striking portion 501 is insulated and connected to the arc-extinguishing chamber.

[0033] The arc-striking piece has an integrated bending structure, and the arc-striking portion 501 is horizontally arranged, and two ends of the arc-striking portion 501 are bent upward and downward respectively to form a first arc-striking portion 502 and a second arc-striking portion 503 .

[0034] In another embodiment, the first arc-starting portion 502 and the second arc-starting portion 503 are fixed at two ends of the arc-forming portion by welding.

[0035] The first arc-starting portion 502 and the second arc-starting portion 503 have the same structure and are only arranged in different directions. The following will only describe the structure of the first arc-starting portion 502 in detail.

[0036] See also Figure 5 The first arc striking portion 502 has an arc driving portion 50201 and an arc burning portion 50202, and the second arc striking portion 503 also has an arc driving portion 50301 and an arc burning portion 50302. One end of the arc driving portion 50301 is connected to the arc striking portion 501, and the other end extends to the end of the lower arc extinguishing chamber. The arc burning portion 50302 is fixedly arranged at the lower end of the arc driving portion 50301 and is horizontally arranged, and the arc burning portion 50302 extends to the bottom of the second arc extinguishing chamber.

[0037] The arc burning portion 50202 of the first arc striking portion 502 is suspended on the top of the first arc extinguishing chamber, and the angle between the side projection profiles of the first arc striking portion and the second arc striking portion is less than or equal to 180° and greater than or equal to 90°. The opening of the angle faces the arc extinguishing chamber.

[0038] The first arc-striking portion 502 and the second arc-striking portion 503 are covered with an insulating layer on one side away from the arc-extinguishing chamber.

[0039] See also Figure 2The static arc angle 4 is fixedly connected to the static contact 2 at the same potential, and the static arc angle 4 is located at the bottom of the first arc extinguishing chamber, the static arc angle 4 and the first arc striking portion are relatively arranged at the upper and lower ends of the first arc extinguishing chamber, and a first arc striking channel 8 is formed in the first arc extinguishing chamber; the moving arc angle 3 is suspended and fixed at the upper end of the second arc extinguishing chamber, the moving arc angle 3 and the second arc striking portion are relatively arranged at the upper and lower ends of the second arc extinguishing chamber, and a second arc striking channel 9 is formed in the second arc extinguishing chamber; the arc striking portion is located between the moving arc angle 3 and the static arc angle 4, the moving contact 1 is rotatably arranged between the moving arc angle 3 and the static arc angle 4, and the arc generated by the moving contact rotating toward the moving arc angle 3 is introduced into the arc striking portion.

[0040] In another embodiment, the moving arc angle 3 is fixed on the top of the second arc extinguishing chamber, and the moving contacts are connected to the same potential through soft wires.

[0041] The first arc extinguishing chamber and the second arc extinguishing chamber have the same structure. The arc extinguishing chamber includes an insulating plate and a grid. The two insulating plates are arranged vertically and spaced apart. The lower part of the insulating plate is connected to the static contact 2. A plurality of L-shaped grids are spaced apart from top to bottom between the two insulating plates.

[0042] The first arc extinguishing chamber is separated from the second arc extinguishing chamber by two insulating partitions, a metal sheet is arranged between the two insulating partitions, and the metal sheet is a magnetic conductive material for shielding the electromagnetic interaction between the arcs in the first arc extinguishing chamber and the second arc extinguishing chamber.

[0043] Example 1

[0044] A circuit breaker comprises a circuit breaker body and the arc striking systems arranged in parallel.

[0045] Example 2

[0046] An electrical device includes a circuit breaker, wherein the circuit breaker adopts the above-mentioned parallel-arranged arc striking system.

[0047] The utility model provides a parallel arrangement of arc extinguishing system. Through two parallel arrangement of arc extinguishing chambers, the arc is guided to two independent arc extinguishing chambers for extinguishing after entering the arc-starting plate, thereby improving the arc extinguishing efficiency. In addition, since the arc is introduced into the two arc extinguishing chambers, the number of grids is increased in the limited space of the circuit breaker, which helps to increase the arc voltage, which is particularly important for AC and DC circuit breakers with high voltage levels, because they require higher arc voltages to ensure that the arc can be reliably extinguished. The design of the arc-starting plate allows the arc to be accurately guided before entering the arc extinguishing chamber. The optimization of the arc path helps to reduce the damage of the arc to other components inside the circuit breaker and extend the service life of the circuit breaker. In addition, the arc extinguishing chambers are separated by two insulating partitions, and there are metal sheets of magnetic conductive materials between the partitions. This design shields the electromagnetic effects between the arcs. Under the same height of the circuit breaker arc extinguishing chamber, the arc extinguishing system achieves twice the height of the arc extinguishing chamber through the parallel arrangement design, so that more grids can be installed in a limited space, thereby improving the space utilization.

[0048] In summary, the parallel-arranged arc striking system technical solution improves the arc extinguishing efficiency and arc voltage of low-voltage circuit breakers through its innovative design. It is suitable for circuit breakers with higher voltage levels and has broad application prospects and significant economic benefits.

[0049] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A parallel-arranged arc striking system, characterized in that: It comprises an arc extinguishing chamber, an arc striking piece (5), a moving contact (1), a stationary contact (2), a moving arc angle (3) and a stationary arc angle (4); The two arc extinguishing chambers are arranged in parallel and spaced apart and are located between the moving arc angle (3) and the stationary contact (2), and the stationary arc angle (4) and the stationary contact (2) are fixedly connected to each other at the same potential; The arc-striking piece comprises an arc-striking portion, a first arc-striking portion and a second arc-striking portion, the arc-striking portion is located on the movement trajectory of the moving contact (1), the arc-striking portion connects the first arc-striking portion and the second arc-striking portion, the end of the first arc-striking portion is located at the upper end of the first arc-extinguishing chamber, the second arc-striking portion is located at the lower end of the second arc-extinguishing chamber, and the arc-striking portion is used to introduce the arc generated by the moving contact opening into the arc-extinguishing chamber.

2. The arc striking system arranged in parallel according to claim 1, characterized in that: The arc-striking portion (501) is located in the middle between the two arc-extinguishing chambers, one end of the first arc-striking portion (502) and the second arc-striking portion (503) are connected to the arc-striking portion (501), the other end of the first arc-striking portion (502) is suspended at the top of the first arc-extinguishing chamber, the other end of the second arc-striking portion (503) is arranged at the bottom of the second arc-extinguishing chamber, and the arc-striking portion (501) is insulated and connected to the arc-extinguishing chamber.

3. A parallel-arranged arc striking system according to claim 2, characterized in that: The arc striking part comprises an arc driving part and an arc burning part; One end of the arc driving portion is connected to the arc striking portion, and the other end extends to the end of the arc extinguishing chamber. The arc burning portion is arranged at the end of the arc driving portion and extends to the end of the arc extinguishing chamber.

4. The arc striking system arranged in parallel according to claim 2, characterized in that: The first arc-striking portion (502) and the second arc-striking portion (503) are covered with an insulating layer on a side away from the arc-extinguishing chamber.

5. A parallel-arranged arc striking system according to any one of claims 1 to 4, characterized in that: The static arc angle (4) is located at the bottom of the first arc extinguishing chamber, and the static arc angle (4) and the first arc striking portion form a first arc striking channel in the first arc extinguishing chamber; The moving arc angle (3) is suspended at the top of the second arc extinguishing chamber, and the moving arc angle (3) and the second arc striking portion form a second arc striking channel in the second arc extinguishing chamber.

6. A parallel-arranged arc striking system according to claim 5, characterized in that: The moving contact (1) is rotatably arranged between a moving arc angle (3) and a static arc angle (4), and the arcing portion is located between the moving arc angle (3) and the static arc angle (4).

7. The arc striking system arranged in parallel according to claim 5, characterized in that: The moving arc angle (3) is fixed on the top of the second arc extinguishing chamber and is connected to the moving contact through a wire.

8. The parallel-arranged arc striking system according to claim 1, characterized in that: The arc extinguishing chamber comprises an insulating plate and a grid, wherein the two insulating plates are arranged vertically and spaced apart, and a plurality of L-shaped grids are spaced apart from top to bottom between the two insulating plates.

9. The parallel-arranged arc striking system according to claim 1, characterized in that: A metal magnetic conductive sheet (10) is arranged between the two arc extinguishing chambers and is used for shielding the electromagnetic effect between the arcs in the two arc extinguishing chambers.

10. A circuit breaker, characterized in that: A parallel-arranged arc striking system comprising any one of claims 1-9.