A circuit breaker arc quenching device

Abstract

This utility model relates to an arc-extinguishing device for a circuit breaker, belonging to the field of low-voltage electrical appliance technology. It includes: two arc-isolating plates and multiple arc-extinguishing grid plates. The two arc-isolating plates are distributed opposite each other on both sides of a stationary contact and a moving contact. Multiple arc-extinguishing grid plates are stacked and fixed between the two arc-isolating plates at intervals along the direction of movement of the moving contact. The ends of the multiple arc-extinguishing grid plates furthest from the moving contact are all considered "farthest ends." All the arc-extinguishing grid plates are arranged inclined upwards from the direction closest to the moving contact to the direction furthest from the moving contact, with the inclination angle increasing sequentially along the direction of movement of the moving contact. This utility model first stacks and fixes multiple arc-extinguishing grid plates at intervals between the two arc-isolating plates along the direction of movement of the moving contact. Then, it arranges the multiple arc-extinguishing grid plates inclined upwards from the direction closest to the moving contact to the direction furthest from the moving contact. This allows for the gradual increase of the distance between the farthest ends of two adjacent arc-extinguishing grid plates without changing the distance between the other ends of the grid plates closest to the moving contact, thus preventing the farthest ends of adjacent arc-extinguishing grid plates from burning and sticking together.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an arc-extinguishing device for circuit breakers. Background Technology

[0002] When the power supply voltage exceeds tens of volts and the breaking current is above tens of amperes, in order to reduce the burn damage to the contacts caused by the electric arc and limit the space for the electric arc to spread, it is usually necessary to take measures to enhance the arc extinguishing capability. The device used for this purpose is called an arc extinguishing device.

[0003] Currently, arc-extinguishing devices are mainly installed inside circuit breakers. For example, patent number 201910645721.0, entitled "An Arc-Extinguishing Device for a Wiring Circuit Breaker," describes a circuit breaker comprising a stationary contact and a moving contact. The moving contact moves along an arc-shaped direction, approaching or moving away from the stationary contact. The arc-extinguishing device includes two arc-isolating plates and multiple arc-extinguishing grid plates. The two arc-isolating plates are spaced apart on opposite sides of the stationary and moving contacts along the direction of movement of the moving contact. The multiple arc-extinguishing grid plates are arranged perpendicular to the direction of movement of the moving contact and are fixed at intervals between the two arc-isolating plates along the direction of movement of the moving contact. This allows the arc generated by the current to be divided into multiple short arcs after the moving contact moves away from the stationary contact, achieving an arc-extinguishing effect.

[0004] The aforementioned patent can only be used for switching on and off small currents. When the current exceeds 1500A, the current disconnection will generate a powerful electric arc, which can easily burn and stick the ends of multiple arc-extinguishing grids away from the moving and stationary contacts, damaging the structure of the arc-extinguishing device and reducing its service life.

[0005] Therefore, how to design an arc-extinguishing device for circuit breakers that can adapt to high current switching and is not easily ablated and bonded is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] This utility model provides a circuit breaker arc extinguishing device, which solves the technical problem that existing circuit breaker arc extinguishing devices are prone to burning multiple arc extinguishing grids far from the ends of the moving and stationary contacts when interrupting large currents during short circuits.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a circuit breaker arc extinguishing device, the circuit breaker including a stationary contact and a moving contact, the moving contact moving from near the stationary contact to away from the stationary contact and generating an arc in the same direction as its movement; including: two arc-blocking plates and multiple arc-extinguishing grid plates.

[0008] Both arc-blocking plates are arranged along the movement direction of the moving contact and are distributed opposite to each other on both sides of the stationary contact and the moving contact. Multiple arc-extinguishing grid plates are stacked at intervals between the two arc-blocking plates along the movement direction of the moving contact. Each arc-extinguishing grid plate is located on one side of the stationary contact and the moving contact, and its two sides are respectively fixed to the opposite side of the two arc-blocking plates to divide the contacting arc into multiple arc segments. The end of each arc-extinguishing grid plate away from the moving contact is the "remote end." Each arc-extinguishing grid plate is arranged inclined upwards from near the moving contact to away from the moving contact, and its inclination angle increases sequentially along the movement direction of the moving contact to gradually increase the distance between the distant ends of adjacent arc-extinguishing grid plates, preventing the distant ends of adjacent arc-extinguishing grid plates from ablation and adhesion.

[0009] The beneficial effects of this utility model are as follows: It changes the structure of the traditional arc-extinguishing device of the circuit breaker. First, multiple arc-extinguishing grid plates are stacked and fixed between two arc-isolating plates at intervals along the movement direction of the moving contact. Then, the multiple arc-extinguishing grid plates are arranged upwards from the direction closest to the moving contact to the direction furthest from the moving contact. Since the tilt angle of the multiple arc-extinguishing grid plates increases sequentially along the movement direction of the moving contact, the distance between the far ends of two adjacent arc-extinguishing grid plates can be increased successively without changing the distance between the other ends of the two adjacent arc-extinguishing grid plates closest to the moving contact. This avoids the burning and sticking of the far ends of the two adjacent arc-extinguishing grid plates, which helps to reduce the temperature of the arc-extinguishing chamber inside the circuit breaker and improve the short-circuit breaking capacity.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, each of the multiple arc-extinguishing grid plates has an arc-extinguishing groove at the other end near the moving contact. The multiple arc-extinguishing grooves penetrate both sides of the opposing arc-extinguishing grid plates corresponding to the direction of movement of the moving contact and form an arc-extinguishing channel between the multiple arc-extinguishing grooves in the same direction as the movement of the moving contact. The stationary contact is placed in the arc-extinguishing channel. Both the moving contact and the electric arc move within the arc-extinguishing channel.

[0012] Furthermore, the two sides of the arc-extinguishing grid corresponding to the arc-extinguishing groove of the plurality of arc-extinguishing grids are respectively the first groove wall and the second groove wall. The length of the plurality of first groove walls is greater than the length of the corresponding second groove wall, and the first groove walls and the second groove walls of two adjacent arc-extinguishing grids are staggered to increase the distance between the relative and adjacent first groove walls and the second groove walls.

[0013] The further beneficial effect of adopting the above is that the length of the first groove wall on both sides of the arc-extinguishing groove of the arc-extinguishing grid is greater than the length of the second groove wall. Since the first groove wall and the second groove wall of two adjacent arc-extinguishing grids are staggered, the distance between the other end of the two adjacent arc-extinguishing grids near the moving contact can be increased, thus avoiding the ablation and adhesion of the other end of the two adjacent arc-extinguishing grids near the moving contact.

[0014] Furthermore, the thickness of the arc-extinguishing grid plate decreases sequentially along the movement direction of the moving contact.

[0015] The further beneficial effects of adopting the above are: the thickness of the arc-extinguishing grid decreases sequentially along the movement direction of the moving contact, which can improve the arc root arc-extinguishing grid's resistance to ablation, prevent the arc-extinguishing grid from burning through, and enhance the arc-extinguishing grid's heat dissipation capacity.

[0016] Furthermore, the distance between the furthest ends of two adjacent arc-extinguishing grid plates is 2 to 3 mm.

[0017] Furthermore, the side corners of the multiple arc-extinguishing grid plates at their far ends are all missing corner structures, and the missing corner structures of two adjacent arc-extinguishing grid plates are arranged in a staggered manner.

[0018] Furthermore, it also includes an arc-inducing plate, which is arranged between two arc-isolating plates in the opposite direction of the inclination of the plurality of arc-extinguishing grid plates and its two sides are respectively fixed to the opposite side of the two arc-isolating plates. The downwardly inclined end of the arc-inducing plate is fixed on the arc-extinguishing grid plate furthest from the stationary contact.

[0019] Furthermore, it also includes a heat sink, which is arranged along the movement direction of the moving contact and located on the side of the plurality of arc-extinguishing grids away from the stationary contact and the moving contact. The heat sink is provided with a plurality of heat dissipation holes, and the plurality of heat dissipation holes are respectively arranged opposite to the gap between two adjacent arc-extinguishing grids. Attached Figure Description

[0020] Figure 1 This is a side-view three-dimensional structural diagram of a circuit breaker arc extinguishing device according to the present invention; Figure 2 This is a side-view three-dimensional structural diagram of a circuit breaker arc extinguishing device after removing two arc-blocking plates according to the present invention; Figure 3 This is a side-view three-dimensional structural diagram of a circuit breaker arc extinguishing device after removing two arc-blocking plates, stationary contacts and moving contacts according to the present invention. Figure 4 This is a three-dimensional structural diagram of the arc-extinguishing grid plate in the arc-extinguishing device of a circuit breaker according to the present invention.

[0021] The attached diagram lists the components represented by each number as follows: 1. Arc blocking plate, 2. Arc extinguishing grid plate, 21. Arc extinguishing groove, 22. First groove wall, 23. Second groove wall, 3. Arc ignition plate, 4. Heat sink, 5. Stationary contact, 6. Moving contact. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] like Figure 1 As shown, an arc-extinguishing device for a circuit breaker includes a stationary contact 5 and a moving contact 6. The moving contact 6 moves from near the stationary contact 5 to away from the stationary contact 5 and generates an arc in the same direction as its movement. It includes two arc-isolating plates 1 and multiple arc-extinguishing grid plates 2. Both arc-blocking plates 1 are arranged along the movement direction of the moving contact 6 and are distributed opposite to each other on both sides of the stationary contact 5 and the moving contact 6. Multiple arc-extinguishing grid plates 2 are stacked at intervals between the two arc-blocking plates 1 along the movement direction of the moving contact 6. The multiple arc-extinguishing grid plates 2 are all located on one side of the stationary contact 5 and the moving contact 6, and their two sides are respectively fixed to the opposite side of the two arc-blocking plates 1 to divide the contacting arc into multiple arc segments. The ends of the multiple arc-extinguishing grid plates 2 that are away from the moving contact 6 are all remote ends. The multiple arc-extinguishing grid plates 2 are all arranged upwards from the direction close to the moving contact 6 to the direction away from the moving contact 6, and their tilt angle increases sequentially along the movement direction of the moving contact 6 to gradually increase the distance between the remote ends of two adjacent arc-extinguishing grid plates 2, so as to avoid the remote ends of two adjacent arc-extinguishing grid plates 2 being burned and stuck.

[0024] like Figure 4 As shown, in some specific embodiments, each of the multiple arc-extinguishing grid plates 2 can be provided with an arc-extinguishing groove 21 at the other end near the moving contact 6. The multiple arc-extinguishing grooves 21 penetrate both sides of the corresponding arc-extinguishing grid plate 2 in the direction of movement of the moving contact 6 and form an arc-extinguishing channel in the same direction of movement as the moving contact 6 between the multiple arc-extinguishing grooves 21; the stationary contact 5 is placed in the arc-extinguishing channel; the moving contact 6 and the electric arc both move in the arc-extinguishing channel.

[0025] like Figure 4 As shown, in some specific embodiments, the two sides of the arc-extinguishing grid 2 corresponding to the arc-extinguishing groove 21 of the multiple arc-extinguishing grids 2 are respectively the first groove wall 22 and the second groove wall 23. The length of the multiple first groove walls 22 is greater than the length of the corresponding second groove wall 23, and the first groove walls 22 and the second groove walls 23 of two adjacent arc-extinguishing grids 2 are staggered to increase the distance between the relative and adjacent first groove walls 22 and the second groove walls 23.

[0026] like Figure 3 As shown, in some specific embodiments, the thickness of the arc-extinguishing grid 2 decreases sequentially along the movement direction of the moving contact 6.

[0027] like Figure 3 As shown, in some specific embodiments, the distance between the far ends of two adjacent arc-extinguishing grid plates 2 can be 2 to 3 mm.

[0028] In some specific embodiments, the side corners of the multiple arc-extinguishing grid plates 2 at their far ends are all missing corner structures, and the missing corner structures of two adjacent arc-extinguishing grid plates 2 are arranged in a staggered manner.

[0029] like Figure 2 and Figure 3 As shown, in some specific embodiments, an arc-inducing plate 3 may also be included. The arc-inducing plate 3 is arranged between two arc-isolating plates 1 in the opposite direction of the inclination of the plurality of arc-extinguishing grid plates 2, and its two sides are respectively fixed on the opposite side of the two arc-isolating plates 1. The downward inclined end of the arc-inducing plate 3 is fixed on the arc-extinguishing grid plate 2 furthest from the stationary contact 5.

[0030] like Figure 1 and Figure 2 As shown, in some specific embodiments, a heat sink 4 is also included. The heat sink 4 is arranged along the movement direction of the moving contact 6 and is located on the side of the plurality of arc-extinguishing grid plates 2 away from the stationary contact 5 and the moving contact 6. The heat sink 4 is provided with a plurality of heat dissipation holes 41 and the plurality of heat dissipation holes 41 are respectively arranged opposite to the gap between two adjacent arc-extinguishing grid plates 2.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A circuit breaker arc extinguishing device, the circuit breaker comprising a stationary contact (5) and a moving contact (6), wherein the moving contact (6) moves from near the stationary contact (5) to away from the stationary contact (5) and generates an electric arc in the same direction as its movement; characterized in that, include: Two arc-blocking plates (1) are arranged along the movement direction of the moving contact (6) and are distributed on both sides of the stationary contact (5) and the moving contact (6); Multiple arc-extinguishing grid plates (2) are stacked at intervals between two arc-isolating plates (1) along the movement direction of the moving contact (6). The multiple arc-extinguishing grid plates (2) are all located on one side of the stationary contact (5) and the moving contact (6), and their two sides are respectively fixed on the opposite side of the two arc-isolating plates (1) to divide the contacting arc into multiple arc segments. The ends of the multiple arc-extinguishing grid plates (2) away from the moving contact (6) are all remote ends. The multiple arc-extinguishing grid plates (2) are all arranged upwardly from the direction close to the moving contact (6) to the direction away from the moving contact (6), and their tilt angle increases sequentially along the movement direction of the moving contact (6) to gradually increase the distance between the remote ends of two adjacent arc-extinguishing grid plates (2) to avoid the remote ends of two adjacent arc-extinguishing grid plates (2) from being burned and stuck.

2. The circuit breaker arc extinguishing device according to claim 1, characterized in that, Each of the multiple arc-extinguishing grid plates (2) is provided with an arc-extinguishing groove (21) at the other end near the moving contact (6). The multiple arc-extinguishing grooves (21) penetrate the two sides of the opposing arc-extinguishing grid plates (2) corresponding to the moving contact (6) in the direction of movement, and form an arc-extinguishing channel between the multiple arc-extinguishing grooves (21) in the same direction of movement as the moving contact (6). The stationary contact (5) is placed in the arc-extinguishing channel. The moving contact (6) and the electric arc both move in the arc-extinguishing channel.

3. The circuit breaker arc extinguishing device according to claim 2, characterized in that, The arc-extinguishing grid plates (2) have a first groove wall (22) and a second groove wall (23) on both sides of their arc-extinguishing grooves (21). The length of each of the first groove walls (22) is greater than the length of the corresponding second groove wall (23), and the first groove walls (22) and second groove walls (23) of two adjacent arc-extinguishing grid plates (2) are staggered to increase the distance between the relative and adjacent first groove walls (22) and second groove walls (23).

4. The circuit breaker arc extinguishing device according to claim 1, characterized in that, The thickness of the arc-extinguishing grid plate (2) decreases sequentially along the movement direction of the moving contact (6).

5. The circuit breaker arc extinguishing device according to claim 1, characterized in that, The distance between the far ends of two adjacent arc-extinguishing grid plates (2) is 2 to 3 mm.

6. The arc-extinguishing device for a circuit breaker according to claim 1, characterized in that, The side corners of the multiple arc-extinguishing grid plates (2) at the far end are all missing corner structures, and the missing corner structures of two adjacent arc-extinguishing grid plates (2) are arranged in a staggered manner.

7. The circuit breaker arc extinguishing device according to claim 1, characterized in that, It also includes an arc-inducing plate (3), which is arranged between two arc-isolating plates (1) in the opposite direction of the multiple arc-extinguishing grid plates (2) and its two sides are respectively fixed on the opposite side of the two arc-isolating plates (1). The downward inclined end of the arc-inducing plate (3) is fixed on the arc-extinguishing grid plate (2) that is furthest away from the stationary contact (5).

8. The arc-extinguishing device for a circuit breaker according to claim 1, characterized in that, It also includes a heat sink (4), which is arranged along the movement direction of the moving contact (6) and located on the side of the plurality of arc-extinguishing grid plates (2) away from the stationary contact (5) and the moving contact (6). The heat sink (4) is provided with a plurality of heat dissipation holes (41), and the plurality of heat dissipation holes (41) are respectively arranged opposite to the gap between two adjacent arc-extinguishing grid plates (2).

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