Contact arc extinguishing device for a circuit breaker

Abstract

This utility model belongs to the field of arc extinguishing technology for circuit breaker contacts, specifically an arc extinguishing device for circuit breaker contacts. It includes a fixed frame, a sealing block on the side wall of the fixed frame, and two first screws directly connected to the fixed frame and the sealing block, with the first screws arranged correspondingly. Multiple mounting holes are provided on the side wall of the fixed frame, and a limiting frame is fixedly connected to the side wall of the fixed frame. A sliding groove is provided on the inner side wall of the limiting frame. A connecting block is provided on the side wall of the sliding groove. An arc extinguishing plate is arranged between the multiple connecting blocks. This utility model connects multiple arc extinguishing plates by using connecting blocks, thereby enabling multiple arc extinguishing plates to perform arc extinguishing operations. The fixed frame, sealing block, and limiting frame on the circuit breaker facilitate the maintenance and replacement of the arc extinguishing structure, helping to avoid the overall disassembly of the circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the field of arc extinguishing technology for circuit breaker contacts, specifically an arc extinguishing device for circuit breaker contacts. Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current under normal circuit conditions and close, carry, and interrupt current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their application range. Circuit breakers are equipped with contact arc extinguishing devices inside.

[0003] The existing arc extinguishing device for circuit breaker contacts has a relatively simple structure. Its working principle is to absorb the electric arc and quickly consume it by dispersing the arc into multiple parts, thus extinguishing the arc. However, due to its simple structure, it generally uses natural heat dissipation. Moreover, whenever it is damaged, the staff needs to disassemble the entire circuit breaker to remove it, which is quite inconvenient.

[0004] Therefore, this utility model provides an arc-extinguishing device for the contacts of a circuit breaker. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A contact arc-extinguishing device for a circuit breaker, comprising a fixed frame, a sealing block provided on the side wall of the fixed frame, and two first screws directly disposed on the fixed frame and the sealing block, the first screws being arranged correspondingly; mounting holes are provided on the side wall of the fixed frame, multiple mounting holes being arranged correspondingly; a limiting frame is fixedly connected to the side wall of the fixed frame, and two limiting frames are arranged parallelly; a sliding groove is provided on the inner side wall of the limiting frame; a connecting block is provided on the side wall of the sliding groove, and multiple connecting blocks are arranged correspondingly; an arc-extinguishing plate is disposed between the multiple connecting blocks, and the arc-extinguishing plates are arranged in a linear array; through the above structure, the connecting blocks connect multiple arc-extinguishing plates, thereby enabling multiple arc-extinguishing plates to perform arc-extinguishing work, and the fixed frame, sealing block, and limiting frame on the circuit breaker provide convenience for the maintenance and replacement of the arc-extinguishing structure, which helps to avoid the overall disassembly of the circuit breaker.

[0007] Preferably, a fixing block is fixedly connected to the inner sidewall of the sealing block, and multiple fixing blocks are arranged in a circumferential array; multiple fixing blocks are directly fixedly connected to a fixing frame; a cooling fan is fixedly connected to the sidewall of the fixing frame; a thermal sensing element is fixedly connected to the sidewall of the sealing block, and the thermal sensing element is positioned corresponding to the cooling fan; a ventilation block is fixedly connected to the sidewall of the fixing frame; through the above structure, the cooling fan accelerates the airflow, thereby accelerating the heat dissipation efficiency of the arc extinguishing structure, which helps to prevent the arc extinguishing plate from overheating for a long time and protects the structural stability of the device. At the same time, the ventilation block guides the airflow, which helps to prevent air short circuits and enhances the heat dissipation effect of the device.

[0008] Preferably, an arc-inducing plate is provided on the side wall of the fixed frame, and the arc-inducing plate is positioned corresponding to the arc-extinguishing plate; a second screw is provided between the arc-inducing plate and the fixed frame; through the above structure, the arc-inducing plate on the side wall of the fixed frame guides the movement of the electric arc, thereby avoiding turbulence of the electric arc inside the circuit breaker, enhancing the stability of the device, and providing convenience for replacing the arc-inducing plate, which is conducive to enhancing the practicality of the device.

[0009] Preferably, limiting protrusions are fixedly attached to the side wall of the fixed frame, and the two limiting protrusions are respectively set to the positions of the arc-starting plate; through the above structure, the limiting protrusions restrict the position of the arc-starting plate, thereby preventing the arc-starting plate from shifting during operation, enhancing the component stability of the device, and helping to reduce the maintenance requirements of the device.

[0010] Preferably, a limiting block is fixedly attached to the side wall of the fixed frame, and the limiting block is set to correspond to the size and position of the sealing block. Through the above structure, the limiting block restricts the top of the sealing block, so that the limiting block cooperates with the first screw to complete the connection between the fixed frame and the sealing block, avoiding the need to make holes in the upper part of the sealing block, which helps to reduce the size of the device and improve the convenience of the device.

[0011] Preferably, a positioning protrusion is fixedly connected to the side wall of the sealing block, and the positioning protrusion is positioned corresponding to the arc extinguishing plate. With the above structure, the positioning protrusion is set to contact the side wall of the connecting block, thereby preventing the connecting block and the arc extinguishing plates between multiple connecting blocks from moving, thus improving the stability of the device.

[0012] Preferably, the fixing frame, sealing block, limiting frame, ventilation block, limiting insert, and positioning protrusion are made of thermosetting plastic material. By using thermosetting plastic material for the fixing frame, sealing block, limiting frame, ventilation block, limiting insert, and positioning protrusion, the structural strength and heat resistance of the components are enhanced, which helps to extend the service life of the device.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The contact arc extinguishing device of the circuit breaker described in this utility model connects multiple arc extinguishing plates by setting a connecting block, thereby enabling multiple arc extinguishing plates to perform arc extinguishing work. The fixed frame, sealing block and limiting frame set on the circuit breaker provide convenience for the maintenance and replacement of the arc extinguishing structure, and help to avoid the overall disassembly of the circuit breaker.

[0015] 2. The contact arc-extinguishing device of the circuit breaker described in this utility model accelerates the airflow by setting a cooling fan, thereby increasing the heat dissipation efficiency of the arc-extinguishing structure. This helps to prevent the arc-extinguishing plate from overheating for a long time and protects the stability of the device structure. At the same time, the ventilation block is set to guide the air, which helps to prevent air short circuits and enhances the heat dissipation effect of the device. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a schematic diagram of the sealing block in this utility model;

[0019] Figure 3 This is a schematic diagram of the connecting block in this utility model;

[0020] Figure 4 This is a schematic diagram of the fixed frame structure in this utility model;

[0021] Figure 5 This is a schematic diagram of the ventilation block in this utility model.

[0022] In the diagram: 1. Fixed frame; 11. Sealing block; 12. Mounting hole; 13. Limiting frame; 14. Connecting block; 15. Arc extinguishing plate; 16. Slide groove; 17. First screw; 2. Fixed block; 20. Fixed bracket; 21. Cooling fan; 22. Thermal sensing element; 23. Ventilation block; 3. Arc ignition plate; 31. Second screw; 4. Limiting protrusion; 5. Limiting insert; 6. Positioning protrusion. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Specific implementation examples are given below.

[0025] like Figures 1 to 5As shown in the figure, an arc-extinguishing device for the contacts of a circuit breaker according to an embodiment of the present invention includes a fixed frame 1, a sealing block 11 provided on the side wall of the fixed frame 1, and a first screw 17 directly provided between the fixed frame 1 and the sealing block 11, with two first screws 17 being arranged correspondingly; mounting holes 12 are provided on the side wall of the fixed frame 1, with multiple mounting holes 12 being arranged correspondingly; a limiting frame 13 is fixedly connected to the side wall of the fixed frame 1, with two limiting frames 13 being arranged in parallel; a sliding groove 16 is provided on the inner side wall of the limiting frame 13; a connecting block 14 is provided on the side wall of the sliding groove 16, with multiple connecting blocks 14 being arranged correspondingly; an arc-extinguishing plate 15 is provided between the multiple connecting blocks 14, and the arc-extinguishing plates 15 are arranged in a linear array; during operation, the operator can install the fixed frame 1 at the corresponding position of the circuit breaker through the mounting holes 12, thereby enabling the contact arc-extinguishing device to be installed by the connecting blocks 14. The arc-extinguishing structure, composed of connecting block 14 and arc-extinguishing plate 15, reaches a predetermined position inside the circuit breaker. During the operation of the arc-extinguishing structure, a first screw 17 is provided between the sealing block 11 and the fixed frame 1, and the two are in a connected state. The arc-extinguishing structure will be restricted to the corresponding position. Whenever it needs to be inspected or maintained, the operator can remove the first screw 17. At this time, since multiple connecting blocks 14 slide in contact with the side wall of the corresponding slide groove 16, the operator can pull out the arc-extinguishing structure from inside the two limit frames 13 for inspection and maintenance. Through the above structure, the connecting block 14 connects multiple arc-extinguishing plates 15, thereby enabling multiple arc-extinguishing plates 15 to perform arc-extinguishing work. The fixed frame 1, sealing block 11 and limit frame 13 on the circuit breaker provide convenience for the maintenance and replacement of the arc-extinguishing structure, which helps to avoid the overall disassembly of the circuit breaker.

[0026] like Figure 2 and Figure 4 As shown, a fixing block 2 is fixedly connected to the inner wall of the sealing block 11, and multiple fixing blocks 2 are arranged in a circumferential array; multiple fixing blocks 2 are directly fixedly connected to a fixing frame 20; a cooling fan 21 is fixedly connected to the side wall of the fixing frame 20; a thermal sensing element 22 is fixedly connected to the side wall of the sealing block 11, and the thermal sensing element 22 is positioned corresponding to the cooling fan 21; a ventilation block 23 is fixedly connected to the side wall of the fixing frame 1; during operation, whenever multiple arc-extinguishing plates 15 reach a certain temperature, the thermal sensing element 22 located on the outer wall of the sealing block 11 can transmit an electrical signal to the cooling fan 21 to make it work. After the cooling fan 21 is working, outside air can enter the circuit breaker through the ventilation block 23 and flow out from the location of the cooling fan 21 under the action of the cooling fan 21. The fixing block 2 and the fixing frame 20 serve to fix the cooling fan 21, and the ventilation block 23 serves to guide the air. Through the above structure, the cooling fan 21 is set to accelerate the air flow rate, thereby accelerating the heat dissipation efficiency of the arc extinguishing structure. This helps to prevent the arc extinguishing plate 15 from overheating for a long time and protects the stability of the device structure. At the same time, the ventilation block 23 guides the air, which helps to prevent air short circuits and enhances the heat dissipation effect of the device.

[0027] like Figure 2 , Figure 4 and Figure 5 As shown, an arc-inducing plate 3 is provided on the side wall of the fixed frame 1, and the arc-inducing plate 3 is positioned corresponding to the arc-extinguishing plate 15. A second screw 31 is provided between the arc-inducing plate 3 and the fixed frame 1. During operation, the operator can fix the arc-inducing plate 3 to the corresponding position on the side wall of the fixed frame 1 using the second screw 31. After the device is installed, the end of the arc-inducing plate 3 away from the fixed frame 1 will be located below the circuit breaker contacts. Whenever the contacts break and an arc is generated, the arc-inducing plate 3 can guide the arc with its own arc-shaped structure and make it quickly reach the positions of the multiple arc-extinguishing plates 15. Through the above structure, the arc-inducing plate 3 is provided on the side wall of the fixed frame 1 to guide the arc movement, thereby avoiding turbulence of the arc inside the circuit breaker, enhancing the stability of the device, and providing convenience for the replacement of the arc-inducing plate 3, which is conducive to enhancing the practicality of the device.

[0028] like Figure 4 and Figure 5 As shown, limiting protrusions 4 are fixedly attached to the side wall of the fixed frame 1, and the two limiting protrusions 4 are respectively set at the positions of the arc-starting plate 3. During operation, the two limiting protrusions 4 corresponding to the positions of the arc-starting plate 3 contact the side wall of the arc-starting plate 3, and the two limiting protrusions 4 can cooperate with the second screw 31 to keep the arc-starting plate 3 in a stable position. Through the above structure, the limiting protrusions 4 restrict the position of the arc-starting plate 3, thereby preventing the arc-starting plate 3 from shifting during operation, enhancing the component stability of the device, and helping to reduce the maintenance requirements of the device.

[0029] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a limiting plug 5 is fixedly attached to the side wall of the fixed frame 1, and the size and position of the limiting plug 5 correspond to those of the sealing block 11. During operation, the limiting plug 5 is positioned to correspond to the top size of the sealing block 11, and the top of the sealing block 11 can be inserted into the limiting plug 5. When connecting the fixed frame 1 and the sealing block 11, the operator can first insert the top of the sealing block 11 into the limiting plug 5, then place the bottom of the sealing block 11 against the corresponding position on the side wall of the fixed frame 1, and finally tighten the two first screws 17 respectively. Through the above structure, the limiting plug 5 restricts the top of the sealing block 11, allowing the limiting plug 5 to cooperate with the first screws 17 to complete the connection between the fixed frame 1 and the sealing block 11, avoiding the need to make holes in the upper part of the sealing block 11, which helps to reduce the size of the device and improve its convenience.

[0030] like Figure 4As shown, a positioning protrusion 6 is fixedly connected to the side wall of the sealing block 11, and the positioning protrusion 6 is positioned corresponding to the arc extinguishing plate 15. During operation, after the connection between the fixing frame 1 and the sealing block 11 is completed, the positioning protrusion 6 fixed to the side wall of the sealing block 11 will contact the side walls of multiple connecting blocks 14 and compress the multiple connecting blocks 14. After being compressed, the position of the multiple connecting blocks 14 will be restricted. Through the above structure, the positioning protrusion 6 is set to contact the side wall of the connecting block 14, thereby preventing the connecting block 14 and the arc extinguishing plate 15 between the multiple connecting blocks 14 from moving, thus improving the stability of the device.

[0031] like Figures 1 to 5 As shown, the fixed frame 1, sealing block 11, limiting frame 13, ventilation block 23, limiting insert 5, and positioning protrusion 6 are made of thermosetting plastic. During operation, the use of thermosetting plastic in the fixed frame 1, sealing block 11, limiting frame 13, ventilation block 23, limiting insert 5, and positioning protrusion 6 leverages the advantages of thermosetting plastics, such as high temperature resistance, excellent insulation, high mechanical strength, and non-flammability. Through the above, the use of thermosetting plastic in the fixed frame 1, sealing block 11, limiting frame 13, ventilation block 23, limiting insert 5, and positioning protrusion 6 enhances their structural strength and heat resistance, thus extending the service life of the device.

[0032] During operation, the operator can install the fixing frame 1 at the corresponding position on the circuit breaker through the mounting hole 12, thereby allowing the arc-extinguishing structure composed of the connecting block 14 and the arc-extinguishing plate 15 to reach the predetermined position inside the circuit breaker. During the operation of the arc-extinguishing structure, a first screw 17 is provided between the sealing block 11 and the fixing frame 1, and the two are in a connected state, thus restricting the arc-extinguishing structure to the corresponding position. Whenever inspection or maintenance is required, the operator can remove the first screw 17. At this time, since multiple connecting blocks 14 slide in contact with the side walls of the corresponding slide grooves 16, the operator can pull the arc-extinguishing structure out from inside the two limiting frames 13 for inspection. During inspection and maintenance, whenever multiple arc-extinguishing plates 15 reach a certain temperature, the thermal sensing element 22 located on the outer wall of the sealing block 11 can send an electrical signal to the cooling fan 21 to activate it. After the cooling fan 21 is activated, outside air can enter the circuit breaker through the ventilation block 23 and flow out from the location of the cooling fan 21 under the action of the cooling fan 21. The fixing block 2 and the fixing frame 20 serve to fix the cooling fan 21, and the ventilation block 23 serves to guide the airflow. The operator can fix the arc-inducing plate 3 to the corresponding position on the side wall of the fixing frame 1 using the second screw 31. After the device is installed, the arc-inducing plate 3 is moved away from the fixing frame 1. The end of the arc ignition plate 3 will be located below the circuit breaker contacts. Whenever the contacts break and an arc is generated, the arc ignition plate 3 can guide the arc with its own arc-shaped structure and make it quickly reach the positions of multiple arc extinguishing plates 15. Two limiting protrusions 4, which are set at the positions of the arc ignition plates 3, respectively contact the side wall of the arc ignition plate 3. The two limiting protrusions 4 can cooperate with the second screw 31 to keep the arc ignition plate 3 in a stable position. The limiting insert 5 is set according to the top size of the sealing block 11. The top of the sealing block 11 can be inserted into the limiting insert 5. When connecting the fixing frame 1 and the sealing block 11, the operator can first insert the top of the sealing block 11 into the limiting insert 5. Inside 5, the bottom of the sealing block 11 is then attached to the corresponding position on the side wall of the fixed frame 1. Finally, the two first screws 17 are tightened respectively. After the connection between the fixed frame 1 and the sealing block 11 is completed, the positioning protrusion 6 fixed on the side wall of the sealing block 11 will contact the side wall of the multiple connecting blocks 14 and squeeze the multiple connecting blocks 14. After the multiple connecting blocks 14 are compressed, their positions will be restricted. The fixed frame 1, sealing block 11, limit frame 13, ventilation block 23, limit insert 5, and positioning protrusion 6 are made of thermosetting plastic material, which gives full play to the advantages of thermosetting plastic, such as high temperature resistance, excellent insulation, high mechanical strength, and non-flammability.

[0033] 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 illustrative of the principles of this 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 claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A contact arc-extinguishing device for a circuit breaker, comprising a fixed frame (1), characterized in that: A sealing block (11) is provided on the side wall of the fixed frame (1), and a first screw (17) is directly provided on the fixed frame (1) and the sealing block (11), with two first screws (17) being arranged in a corresponding manner; an installation hole (12) is provided on the side wall of the fixed frame (1), with multiple installation holes (12) being arranged in a corresponding manner; a limit frame (13) is fixedly connected to the side wall of the fixed frame (1), with two limit frames (13) being arranged in parallel; a sliding groove (16) is provided on the inner side wall of the limit frame (13); a connecting block (14) is provided on the side wall of the sliding groove (16), with multiple connecting blocks (14) being arranged in a corresponding manner; an arc extinguishing plate (15) is provided between multiple connecting blocks (14), with the arc extinguishing plates (15) being arranged in a linear array.

2. The contact arc-extinguishing device for a circuit breaker according to claim 1, characterized in that: A fixing block (2) is fixedly connected to the inner side wall of the sealing block (11), and multiple fixing blocks (2) are arranged in a circumferential array; multiple fixing blocks (2) are directly fixedly connected to a fixing frame (20); a cooling fan (21) is fixedly connected to the side wall of the fixing frame (20); a thermal sensing element (22) is fixedly connected to the side wall of the sealing block (11), and the thermal sensing element (22) is arranged corresponding to the position of the cooling fan (21); a ventilation block (23) is fixedly connected to the side wall of the fixing frame (1).

3. The contact arc-extinguishing device for a circuit breaker according to claim 1, characterized in that: An arc-inducing plate (3) is provided on the side wall of the fixed frame (1), and the arc-inducing plate (3) is positioned corresponding to the arc-extinguishing plate (15); a second screw (31) is provided between the arc-inducing plate (3) and the fixed frame (1).

4. The contact arc-extinguishing device for a circuit breaker according to claim 3, characterized in that: Limiting protrusions (4) are fixedly attached to the side wall of the fixed frame (1), and the two limiting protrusions (4) are respectively set to the positions of the arc-drawing plate (3).

5. The contact arc-extinguishing device for a circuit breaker according to claim 4, characterized in that: A limiting plug (5) is fixedly attached to the side wall of the fixed frame (1), and the size and position of the limiting plug (5) are set to correspond to the sealing block (11).

6. The contact arc-extinguishing device for a circuit breaker according to claim 2, characterized in that: A positioning protrusion (6) is fixedly connected to the side wall of the sealing block (11), and the positioning protrusion (6) is positioned corresponding to the position of the arc extinguishing plate (15).

7. The contact arc-extinguishing device for a circuit breaker according to claim 6, characterized in that: The fixed frame (1), sealing block (11), limiting frame (13), ventilation block (23), limiting insert (5), and positioning protrusion (6) are made of thermosetting plastic material.

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