Arc extinguishing device of circuit breaker

Abstract

The utility model discloses an arc extinguishing device of a circuit breaker, and relates to the technical field of low-voltage electric appliances. The arc extinguishing device of the circuit breaker comprises an arc extinguishing grid sheet and a grid sheet auxiliary heat dissipation structure, the grid sheet auxiliary heat dissipation structure comprises a plurality of mounting plates, insulating clamping plates, aluminum alloy heat dissipation fins, micro heat pipes, gas circulation holes and graphene heat conduction films, and the mounting plates are arranged on the two sides of the arc extinguishing grid sheet; the insulating clamping plate is fixedly connected to the surface of the mounting plate, the aluminum alloy cooling fins are fixedly connected to the surface of the insulating clamping plate, the miniature heat pipes are fixedly connected with the insulating clamping plate, and the end, away from the insulating clamping plate, of each miniature heat pipe is fixedly connected with the mounting plate. The arc extinguishing performance and reliability are remarkably improved through the multi-stage collaborative heat dissipation structure, the arc is effectively segmented and lengthened through the design of the grooves and the notches in the surfaces of the arc extinguishing grid pieces, cooling is accelerated, and heat is directly conducted through the bottom heat dissipation fins to improve the heat dissipation efficiency.

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 a circuit breaker. Background Technology

[0002] The arc extinguishing device of a circuit breaker is a special component used to eliminate the high-temperature electric arc generated when the circuit is broken. Its core functions include limiting the arc expansion space, accelerating arc cooling, and cutting off the current path, thereby avoiding equipment damage and personal injury. The device achieves arc extinguishing by means of mechanical force stretching, magnetic field arc blowing, narrow slit segmentation, or medium cooling (such as oil or vacuum). Common types include air magnetic field arc extinguishing, oil arc extinguishing, and vacuum arc extinguishing.

[0003] Existing arc-extinguishing devices for circuit breakers have simple notch structures for their arc-extinguishing grids, resulting in low breaking capacity and an inability to extinguish arcs quickly and effectively. Furthermore, they generally rely on natural cooling, which has limited heat dissipation efficiency and does not provide good heat dissipation. This leads to continuous high temperatures in the contacts and arc-extinguishing medium, accelerating the aging of the insulation material and reducing the strength of the medium. This may cause arc reignition or throttling overvoltage. Therefore, an arc-extinguishing device for circuit breakers is needed. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide an arc extinguishing device for a circuit breaker. This device can solve the problem that the arc extinguishing device mainly relies on natural cooling, which has limited heat dissipation efficiency, resulting in continuous high temperature of the contacts and arc extinguishing medium, accelerating the aging of the insulation material and reducing the strength of the medium, which may cause arc reignition or current throttling overvoltage.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an arc-extinguishing device for a circuit breaker, comprising an arc-extinguishing grid and an auxiliary heat dissipation structure for the grid. The auxiliary heat dissipation structure for the grid includes a mounting plate, an insulating clamp, aluminum alloy heat dissipation fins, micro heat pipes, gas flow holes, and graphene thermal conductive films. Multiple mounting plates are arranged on both sides of the arc-extinguishing grid. The insulating clamp is fixedly connected to the surface of the mounting plate. Multiple aluminum alloy heat dissipation fins are fixedly connected to the surface of the insulating clamp. Multiple micro heat pipes are fixedly connected to the insulating clamp. The end of each micro heat pipe furthest from the insulating clamp is fixedly connected to the mounting plate. Multiple gas flow holes are formed on the surface of the insulating clamp. The number of graphene thermal conductive films is the same as the number of mounting plates and they are fixedly connected to the corresponding mounting plate surfaces. Each graphene thermal conductive film is in contact with the insulating clamp.

[0006] Preferably, the surface of the arc-extinguishing grid is provided with a first groove and the surface of the arc-extinguishing grid is provided with a second groove, and the first groove and the second groove have the same shape.

[0007] Preferably, the first groove has a first notch A inside, and the first groove has a second notch B inside, with the first notch A and the second notch B being connected.

[0008] Preferably, mounting blocks are fixedly connected to both sides of the surface of the arc-extinguishing grid, and there are multiple arc-extinguishing grids.

[0009] Preferably, the surface of the mounting plate has mounting slots that are the same number as and compatible with the number of mounting blocks, and the mounting blocks engage with the mounting slots.

[0010] Preferably, the surface of the insulating clamp is provided with a plurality of pressure relief holes at equal intervals.

[0011] Preferably, heat dissipation fins are fixedly connected to both sides of the bottom of the arc-extinguishing grid.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The arc-extinguishing device of this circuit breaker significantly improves arc-extinguishing performance and reliability through a multi-stage collaborative heat dissipation structure. The groove and notch design on the surface of the arc-extinguishing grid effectively divides and elongates the arc to accelerate cooling. The bottom heat dissipation fins directly conduct heat to improve heat dissipation efficiency. The graphene thermal conductive film combined with aluminum alloy heat dissipation fins and micro heat pipes forms an efficient heat conduction path. The phase change cycle of the micro heat pipes greatly enhances the heat dissipation capacity. The gas flow holes promote convection cooling and optimize the heat dissipation effect. The pressure relief holes balance the gas pressure in the arc-extinguishing chamber to ensure stable operation. This solves the problem that the arc-extinguishing device mainly relies on natural cooling, which has limited heat dissipation efficiency and leads to continuous high temperature of the contacts and arc-extinguishing medium, accelerating the aging of the insulation material and reducing the strength of the medium, which may cause arc reignition or current-limiting overvoltage. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of the main body of this utility model;

[0016] Figure 2 This is a schematic diagram of the insulating clamp of this utility model;

[0017] Figure 3 This is a schematic diagram of the arc-extinguishing grid plate of this utility model;

[0018] Figure 4 This is a schematic diagram of the mounting plate of this utility model.

[0019] Reference numerals in the attached drawings: 1. Arc-extinguishing grid; 2. First groove; 3. Second groove; 4. First notch A; 5. Second notch B; 6. Mounting clip; 7. Heat dissipation fins; 8. Mounting plate; 9. Insulating clamp; 10. Pressure relief hole; 11. Aluminum alloy heat dissipation fins; 12. Miniature heat pipe; 13. Gas flow hole; 14. Mounting slot; 15. Graphene thermal conductive film. Detailed Implementation

[0020] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Please see Figure 1-4This utility model provides a technical solution: an arc-extinguishing device for a circuit breaker, comprising an arc-extinguishing grid 1 and a grid-assisted heat dissipation structure. The grid-assisted heat dissipation structure includes a mounting plate 8, an insulating clamp 9, aluminum alloy heat dissipation fins 11, micro heat pipes 12, gas flow holes 13, and a graphene thermal conductive film 15. Multiple mounting plates 8 are arranged on both sides of the arc-extinguishing grid 1. The insulating clamp 9 is fixedly connected to the surface of the mounting plate 8. Multiple aluminum alloy heat dissipation fins 11 are fixedly connected to the surface of the insulating clamp 9. Multiple micro heat pipes 12 are fixedly connected to the insulating clamp 9, with one end of each micro heat pipe 12 away from the insulating clamp 9 fixedly connected to the mounting plate 8. Multiple gas flow holes 13 are opened on the surface of the insulating clamp 9. The number of graphene thermal conductive films 15 is the same as that of the mounting plates 8, and they are all fixedly connected to the corresponding mounting plate 8 surface. Each graphene thermal conductive film 15 is in contact with the insulating clamp 9.

[0025] Furthermore, according to the arc extinguishing device of a circuit breaker according to claim 1, a first groove 2 is formed on the surface of the arc extinguishing grid plate 1, a second groove 3 is formed on the surface of the arc extinguishing grid plate 1, the first groove 2 and the second groove 3 have the same shape, a first notch A4 is formed inside the first groove 2, a second notch B5 is formed inside the first groove 2, the first notch A4 and the second notch B5 are connected, mounting blocks 6 are fixedly connected to both sides of the surface of the arc extinguishing grid plate 1, the number of arc extinguishing grid plates 1 is multiple, the surface of the mounting plate 8 has mounting slots 14 that are the same number as the number of mounting blocks 6 and are adapted, the mounting blocks 6 are engaged with the mounting slots 14, the surface of the insulating clamp plate 9 has multiple pressure relief holes 10 equidistantly formed on the surface, and heat dissipation fins 7 are fixedly connected to both sides of the bottom of the arc extinguishing grid plate 1.

[0026] Furthermore, the first groove 2 and the second groove 3 on the surface of the arc-extinguishing grid 1, as well as the first notch A4 and the second notch B5 that are connected internally, divide and lengthen the arc to accelerate cooling. At the same time, the heat dissipation fins 7 at the bottom of the arc-extinguishing grid 1 directly conduct heat. The insulating clamps 9 on both sides of the mounting plate 8 quickly transfer heat to the aluminum alloy heat dissipation fins 11 and the micro heat pipes 12 through the graphene thermal conductive film 15. The micro heat pipes 12 use phase change cycles to enhance heat dissipation efficiency. The gas flow holes 13 on the insulating clamps 9 promote the discharge of high-temperature gas to form convection cooling. The pressure relief holes 10 are used to release the air pressure between the arc-extinguishing grids 1 to avoid excessive air pressure in the arc-extinguishing chamber. The arc-extinguishing grid 1 is modularly assembled by engaging with the mounting slots 14 on the mounting plate 8 through the mounting clips 6, ensuring the long-term stable operation of the heat dissipation structure.

[0027] Furthermore, the multi-level collaborative heat dissipation structure significantly improves arc extinguishing performance and reliability. The groove and notch design on the surface of the arc extinguishing grid effectively divides and elongates the arc to accelerate cooling. The bottom heat dissipation fins directly conduct heat to improve heat dissipation efficiency. The graphene thermal conductive film combined with aluminum alloy heat dissipation fins and micro heat pipes forms an efficient heat conduction path. The phase change cycle of the micro heat pipes greatly enhances heat dissipation capacity. The gas flow holes promote convection cooling and optimize heat dissipation effect. The pressure relief holes balance the gas pressure in the arc extinguishing chamber to ensure stable operation. This solves the problem that the arc extinguishing device mainly relies on natural cooling, which has limited heat dissipation efficiency and leads to continuous high temperature of the contacts and arc extinguishing medium, accelerating the aging of insulation materials and reducing the strength of the medium, which may cause arc reignition or current overvoltage.

[0028] Structural Description: Arc-extinguishing grid 1: The arc path is divided and extended by a composite structure of multiple grooves and notches on the surface, realizing multi-dimensional dispersion of arc energy and accelerated cooling;

[0029] First groove 2: A key geometric feature that forms the arc shunt path, guiding the arc expansion through the arc-shaped depression to reduce the local energy density;

[0030] The second groove 3 works in conjunction with the first groove to create multiple distributed heat dissipation channels to enhance arc diffusion and heat exchange area;

[0031] First gap A4: The detailed structural design of the connecting groove triggers arc splitting and extends its trajectory through abrupt path changes;

[0032] Second gap B5: Together with the first gap, it forms a dynamic arc blocking zone, further weakening the arc continuity and promoting energy dissipation;

[0033] Installation Block 6: The core connecting component of modular assembly, which enables rapid integration of the arc extinguishing unit and the heat dissipation system through a standardized snap-fit ​​structure;

[0034] Heat dissipation fin 7: A thermally conductive extension structure arranged at the bottom of the arc-extinguishing grid, which enhances the conduction of heat to the auxiliary heat dissipation module by increasing the contact area;

[0035] Mounting plate 8: Serves as a supporting frame to carry multi-layer heat dissipation components, and ensures the spatial positioning and coordinated operation of each heat dissipation unit through a rigid structure;

[0036] Insulating clamp 9: An intermediate layer that combines electrical isolation and heat conduction, using composite materials to achieve directional heat transfer and system safety protection;

[0037] Pressure relief hole 10: A pressure regulating channel that runs through the insulating clamp to balance the internal air pressure fluctuations of the arc extinguishing chamber and avoid performance degradation caused by gas expansion;

[0038] Aluminum alloy heat sink fins 11: Accelerate the radiation and convection diffusion of heat to the surrounding environment through the extended surface structure of the high thermal conductivity metal;

[0039] Miniature heat pipe 12: Together with the mounting plate and insulating clamp, it forms an active heat dissipation cycle to achieve rapid temperature homogenization in high heat flux areas;

[0040] Gas flow hole 13: forms a through-flow air convection path, driving a continuous heat exchange process between the exhaust of high-temperature gas and the intake of cold air;

[0041] Mounting slot 14: A positioning interface that matches the mounting block, providing mechanical locking and tolerance compensation functions to ensure assembly stability and maintainability;

[0042] Graphene thermal conductive film 15: An ultra-thin, highly thermally conductive medium covering the surface of the mounting plate, which eliminates interfacial thermal resistance and improves cross-layer heat transfer efficiency through molecular-level contact.

[0043] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An arc-extinguishing device for a circuit breaker, characterized in that, include: Arc-quenching grid (1); The grid-assisted heat dissipation structure includes a mounting plate (8), an insulating clamp (9), aluminum alloy heat dissipation fins (11), micro heat pipes (12), gas flow holes (13), and graphene thermal conductive film (15). There are multiple mounting plates (8), all of which are located on both sides of the arc-extinguishing grid (1). The insulating clamp (9) is fixedly connected to the surface of the mounting plate (8). There are multiple aluminum alloy heat dissipation fins (11), all of which are fixedly connected to the surface of the insulating clamp (9). There are multiple micro heat pipes (12), all of which are fixedly connected to the insulating clamp (9). The end of each micro heat pipe (12) away from the insulating clamp (9) is fixedly connected to the mounting plate (8). There are multiple gas flow holes (13), all of which are opened on the surface of the insulating clamp (9). The number of graphene thermal conductive films (15) is the same as that of the mounting plates (8), and all of which are fixedly connected to the corresponding mounting plate (8) surface. Each graphene thermal conductive film (15) is in contact with the insulating clamp (9).

2. The arc-extinguishing device for a circuit breaker according to claim 1, characterized in that: The surface of the arc-extinguishing grid plate (1) is provided with a first groove (2) and a second groove (3), and the first groove (2) and the second groove (3) are the same shape.

3. The arc-extinguishing device for a circuit breaker according to claim 2, characterized in that: The first groove (2) has a first notch A (4) inside and a second notch B (5) inside, and the first notch A (4) and the second notch B (5) are connected.

4. The arc-extinguishing device for a circuit breaker according to claim 1, characterized in that: Both sides of the surface of the arc extinguishing grid plate (1) are fixedly connected with mounting blocks (6), and there are multiple arc extinguishing grid plates (1).

5. The arc-extinguishing device for a circuit breaker according to claim 1, characterized in that: The surface of the mounting plate (8) is provided with mounting slots (14) that are the same number as and compatible with the mounting blocks (6), and the mounting blocks (6) are engaged with the mounting slots (14).

6. The arc-extinguishing device for a circuit breaker according to claim 1, characterized in that: The insulating clamp (9) has multiple pressure relief holes (10) spaced equidistantly on its surface.

7. The arc-extinguishing device for a circuit breaker according to claim 1, characterized in that: Heat dissipation fins (7) are fixedly connected to both sides of the bottom of the arc extinguishing grid (1).

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