Circuit breaker arc extinguishing device and circuit breaker

Abstract

A circuit breaker arc extinguishing device effectively solves the problems that the structure is single, the arc extinguishing effect is poor, the protection performance is low, flexible replacement is difficult, and the maintenance cost is high. Comprising a U-shaped shell, a plurality of arc extinguishing grid pieces which are arranged at intervals in the vertical direction are detachably installed in the shell, every two adjacent arc extinguishing grid pieces are arranged in a positive and negative staggered mode, and the left side and the right side of each arc extinguishing grid piece are fixedly connected with a first fastening piece and a second fastening piece which are used for assembling the arc extinguishing grid pieces respectively. The inner side wall, close to the arc extinguishing grid sheet at the top end, of the shell is fixedly provided with a barrier piece, and the top end of the shell is fixedly connected with an insulating piece. The structure is ingenious, the arc extinguishing effect is more stable and reliable through the cooperation of the arc extinguishing grid sheet, the first U-shaped opening, the second U-shaped opening, the arc pressing plate and the insulating plate, the arc spraying phenomenon of an electric arc can be effectively prevented, the arc extinguishing effect is greatly improved, the use safety is higher, damage caused by environmental corrosion and the like is avoided, and the use protection performance is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to an arc extinguishing device for a circuit breaker and a circuit breaker. Background Art

[0002] Circuit breakers are important equipment in low-voltage electrical appliances. They are used in low-voltage power distribution circuits, motors or other electrical equipment to connect, carry and segment currents under normal conditions or abnormal conditions (such as short circuits). With the continuous development of the power market, circuit breakers have evolved from a simple line protection switch to a part of the overall solution for electrical systems, so the market's requirements for circuit breakers are getting higher and higher.

[0003] The arc extinguishing system is an important part of the circuit breaker. The arc extinguishing chamber in the circuit breaker plays the role of lengthening, breaking and extinguishing the arc generated when the contacts are disconnected during a short circuit fault. The arc extinguishing grid is one of the basic methods to extinguish the arc. The arc extinguishing grid is generally made of steel sheets. When an arc is generated between the contacts, the arc is pulled into the arc extinguishing grid under the contraction force of the magnetic lines of force. A long arc is divided into multiple short arcs. When the AC current passes through zero, all short arcs are extinguished at the same time. Due to the near-cathode effect, a starting dielectric strength of 150-250V immediately appears near the cathode of each short arc. As long as the sum of the starting dielectric strengths of all series-connected short arcs is greater than the applied voltage between the contacts, the arc will no longer reignite.

[0004] In the prior art, a Chinese patent with authorization announcement number CN219303593U discloses an arc extinguishing device for a molded case circuit breaker and a molded case circuit breaker, in which a plurality of arc extinguishing grids are installed and arranged on a side plate.

[0005] However, the above technical solution still has at least the following defects: the traditional arc extinguishing chamber has a single structure, resulting in a general arc-starting effect of the arc extinguishing chamber, and even the arc cannot be completely introduced into the arc extinguishing chamber or arc spraying occurs, which is easy to cause damage and thus reduce the service life of the circuit breaker. It is also easily affected by the environment and causes rust, which reduces the arc extinguishing effect and even causes breakdown, resulting in long-term arcing. The safety and reliability of use are low, and traditional arc extinguishing grids are usually riveted and installed, which are difficult to flexibly load and unload. During maintenance and replacement, the entire arc extinguishing grid is often replaced due to damage to individual arc extinguishing grids, which greatly increases the maintenance cost and has great limitations on use. Utility Model Content

[0006] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a circuit breaker arc extinguishing device, which effectively solves the problems of single structure, easy damage, poor arc extinguishing effect, low protection, and difficult to flexibly replace and high maintenance cost.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] On one hand, an arc extinguishing device for a circuit breaker is provided, comprising a U-shaped housing, wherein a plurality of arc extinguishing grids arranged at intervals in a vertical direction are detachably installed in the housing, two adjacent arc extinguishing grids are arranged alternately in positive and negative directions, a first fastener and a second fastener for assembling the arc extinguishing grids are respectively fixedly connected to the left and right sides of the arc extinguishing grids, a barrier is fixedly installed on the inner side wall of the arc extinguishing grids near the top of the housing, and an insulating member is fixedly connected to the top of the housing;

[0009] The arc-extinguishing grid comprises a first U-shaped opening and a second U-shaped opening, wherein the first U-shaped opening is opened at the front end of the arc-extinguishing grid, and the second U-shaped opening is opened at the right side of the rear end of the first U-shaped opening;

[0010] The barrier member includes a baffle and an arc-suppressing plate. The front end of the baffle is provided with a third U-shaped opening adapted to the arc-extinguishing grid. The arc-suppressing plate is hinged at the rear end of the third U-shaped opening. The arc-suppressing plate can be flipped between the baffle and the insulating member.

[0011] Further preferably, the insulating member comprises an insulating plate, the insulating plate is fixedly connected to the top end of the shell, and an arc-shaped plate adapted to the arc-extinguishing grid is formed in the middle of the insulating plate.

[0012] Further preferably, the barrier member further comprises a spring, the bottom end of the spring is fixedly connected to the arc pressure plate, and the top end of the spring is fixedly connected to the arc plate.

[0013] Further preferably, the first fastener comprises a first latch fixedly connected to the left side of the arc-extinguishing grid, and a positioning column is fixedly connected to the rear end of the first latch.

[0014] Further preferably, a first card slot opening forward is formed at the front end of the shell, the first card slot is adapted to the first latch, the first latch is inserted into the first card slot, and the positioning column is clamped at the rear end of the first card slot.

[0015] Further preferably, the second fastener includes a second pin fixedly connected to the right side of the arc extinguishing grid, a rear end of the second pin is fixedly connected to a support column, and a first thread groove is formed on an outer surface of the second pin close to the support column.

[0016] Further preferably, the front end of the shell is provided with a second card slot opening forward, the second card slot is adapted to the second pin, the second pin is inserted in the second card slot, the rear end of the second card slot is fixedly connected to a threaded support plate, the outer surface of the shell close to the threaded support plate is provided with a second thread slot adapted to the first thread slot, the support column is inserted in the threaded support plate, and the first thread slot and the second thread slot are combined to form a fastening thread slot.

[0017] Further preferably, the outer ring surface of the threaded support plate is threadedly connected with a fastening ring, the bottom end of the fastening ring is threadedly installed in the fastening thread groove, the top end of the fastening ring forms a limiting head, and the support column is clamped in the limiting head.

[0018] Further preferably, the shell is made of melamine board, and the left and right side walls of the shell are both provided with guide grooves, and the arc-extinguishing grids are inserted into the guide grooves.

[0019] Another aspect provides a circuit breaker, comprising a circuit breaker having an arc extinguishing device provided by the first aspect.

[0020] Compared with the prior art, the utility model has an ingenious structure and is easy to operate. Through the cooperation of the arc extinguishing grid, the first U-shaped opening, the second U-shaped opening, the arc pressing plate and the insulating plate, the arc extinguishing effect is more stable and reliable, and the arc spraying phenomenon of the arc can be effectively prevented, which greatly improves the arc extinguishing effect, is safer to use, avoids damage such as rust in the environment, and effectively improves the protection of use. Through the cooperation of the first latch, the first slot, the second latch, the second slot, the threaded support plate and the fastening ring, the arc extinguishing grid can be quickly and timely loaded and unloaded, and the damaged part can be flexibly replaced during inspection and maintenance. It is more flexible and convenient to use, greatly reduces the maintenance cost, and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view axonometric structural schematic diagram of the utility model;

[0022] Figure 2 It is a front view cutaway structural schematic diagram of the utility model;

[0023] Figure 3 This is a front view structural diagram of the arc extinguishing grid of the utility model;

[0024] Figure 4 It is a schematic diagram of the cutaway structure of the shell of the utility model;

[0025] Figure 5 It is a schematic diagram of the cutaway structure of the arc extinguishing grid of the utility model;

[0026] Figure 6It is a schematic diagram of the arc extinguishing grid structure of the utility model;

[0027] Figure 7 This is a schematic diagram of the second clamping groove, the thread support plate and the second thread groove structure of the utility model;

[0028] Figure 8 The utility model Figure 5 Enlarged structural diagram at A in the middle.

[0029] Explanation of the symbols in the schematic diagram:

[0030] 1. Shell; 2. Arc-extinguishing grid; 3. First fastener; 4. Second fastener; 5. Blocking member; 6. Insulating member; 7. First U-shaped opening; 8. Second U-shaped opening; 9. Baffle; 10. Arc-pressing plate; 11. Third U-shaped opening; 12. Insulating plate; 13. Arc plate; 14. Spring; 15. First latch; 16. Positioning column; 17. First slot; 18. Second latch; 19. Support column; 20. First threaded groove; 21. Second slot; 22. Threaded support plate; 23. Second threaded groove; 24. Fastening threaded groove; 25. Fastening ring; 26. Limiting head; 27. Guide groove. DETAILED DESCRIPTION

[0031] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0032] On the one hand, a circuit breaker arc extinguishing device is provided, comprising Figures 1 to 8 A U-shaped shell 1 is provided, in which a plurality of arc-extinguishing grids 2 arranged at intervals in the vertical direction are detachably installed, and two adjacent arc-extinguishing grids 2 are arranged alternately in positive and negative directions, and the left and right sides of the arc-extinguishing grid 2 are respectively fixedly connected with a first fastener 3 and a second fastener 4 for assembling the arc-extinguishing grid 2, a barrier 5 is fixedly installed on the inner side wall of the shell 1 near the top arc-extinguishing grid 2, and an insulating member 6 is fixedly connected to the top of the shell 1.

[0033] The arc extinguishing chamber formed by a number of vertically staggered arc extinguishing grids 2 can effectively absorb the arc, and cooperate with the barrier 5 above the arc extinguishing grid 2 to effectively prevent the arc spraying phenomenon, and ensure that the arc can be completely introduced into the arc extinguishing chamber, thereby greatly improving the arc extinguishing effect, effectively reducing safety hazards, and having higher safety and reliability in use. In addition, through the cooperation of the insulating part 6 and the shell 1, not only can the arc extinguishing grid 2 be loaded and unloaded in a timely and flexible manner, which is convenient for maintenance and replacement and reduces maintenance costs, but it can also effectively improve the protection effect, greatly reduce damage such as rust, and effectively improve the flexibility and adaptability of use.

[0034] The arc-extinguishing grid 2 comprises a first U-shaped opening 7 and a second U-shaped opening 8 . The first U-shaped opening 7 is opened at the front end of the arc-extinguishing grid 2 , and the second U-shaped opening 8 is opened at the right side of the rear end of the first U-shaped opening 7 .

[0035] Through the cooperation of the first U-shaped opening 7 and the second U-shaped opening 8, in the arc extinguishing chamber formed by the arc extinguishing grid pieces 2 being arranged in an alternating manner, the first U-shaped opening 7 and the second U-shaped opening 8 are arranged alternately in the vertical direction in the left-right symmetrical direction, thereby greatly improving the arc striking effect of the arc extinguishing chamber and further improving the arc extinguishing performance.

[0036] The barrier 5 includes a baffle 9 and an arc-suppressing plate 10 . The front end of the baffle 9 is provided with a third U-shaped opening 11 adapted to the arc-extinguishing grid 2 . The arc-suppressing plate 10 is hinged at the rear end of the third U-shaped opening 11 . The arc-suppressing plate 10 can be flipped between the baffle 9 and the insulating member 6 .

[0037] Through the cooperation of the baffle 9 and the arc pressure plate 10, the arc spraying phenomenon can be effectively prevented, thereby ensuring safe use. In the process of flipping the arc pressure plate 10, the arc extinguishing performance of the arc extinguishing chamber in the vertical direction is further increased, and it can also better adapt to the disconnection of the contacts. When the contacts are disconnected, after touching the arc pressure plate 10, the arc pressure plate 10 is driven to flip upward under the action of inertia, which not only has a buffering effect, but also can improve the arc extinguishing effect.

[0038] In order to achieve the effect of improving the protection, the insulating member 6 includes an insulating plate 12, which is fixedly connected to the top of the housing 1, and an arc plate 13 adapted to the arc extinguishing grid 2 is formed in the middle of the insulating plate 12. Through the cooperation of the insulating plate 12 and the housing 1, the arc extinguishing chamber is enclosed to prevent the rear end of the arc extinguishing grid 2 from being directly exposed, thereby preventing damage such as rust from the environment, effectively improving the protection of use, and the insulating plate 12 can also play an insulating role, further improving the safety of use.

[0039] In order to achieve the effect of flexible adjustment, the barrier 5 also includes a spring 14, the bottom end of the spring 14 is fixedly connected to the arc pressing plate 10, and the top end of the spring 14 is fixedly connected to the arc plate 13. Through the elastic force of the spring 14, the arc pressing plate 10 can automatically reset after turning upward, which improves the buffering effect and can also be automatically adjusted, and has higher flexibility in use.

[0040] In order to achieve the effect of facilitating positioning, the first fastener 3 includes a first latch 15 fixedly connected to the left side of the arc extinguishing grid 2, and a positioning column 16 is fixedly connected to the rear end of the first latch 15. A first slot 17 opening forward is provided at the front end of the housing 1, and the first slot 17 is adapted to the first latch 15. The first latch 15 is inserted into the first slot 17, and the positioning column 16 is clamped at the rear end of the first slot 17. The first latch 15 is U-shaped. Through the cooperation of the first latch 15 and the first slot 17, the first latch 15 is tightly inserted into the first slot 17, so that the arc extinguishing grid 2 can be firmly and accurately installed in the housing 1. Then, with the cooperation of the positioning column 16 and the housing 1, the accuracy of installation is guaranteed and disassembly is convenient, which provides convenience for flexible loading and unloading and maintenance.

[0041] In order to achieve the effect of facilitating loading and unloading, the second fastener 4 includes a second latch 18 fixedly connected to the right side of the arc extinguishing grid 2, the rear end of the second latch 18 is fixedly connected to a support column 19, and the outer surface of the second latch 18 near the support column 19 is provided with a first thread groove 20. The front end of the housing 1 is provided with a second card slot 21 opening forward, the second card slot 21 is adapted to the second latch 18, the second latch 18 is inserted into the second card slot 21, the rear end of the second card slot 21 is fixedly connected to a thread support plate 22, the outer surface of the housing 1 near the thread support plate 22 is provided with a second thread groove 23 adapted to the first thread groove 20, the support column 19 is inserted into the thread support plate 22, and the first thread groove 20 and the second thread groove 23 are surrounded to form a fastening thread groove 24. The outer ring surface of the threaded support plate 22 is threadedly connected with a fastening ring 25, the bottom end of the fastening ring 25 is threadedly installed in the fastening thread groove 24, the top end of the fastening ring 25 forms a limit head 26, and the support column 19 is clamped in the limit head 26. The second latch 18 is U-shaped, and the threaded support plate 22 is semicircular. Through the cooperation of the second latch 18 and the second clamping groove 21, the second latch 18 is tightly inserted into the second clamping groove 21. At the same time, the support column 19 is clamped in the threaded support plate 22, and the first thread groove 20 and the second thread groove 23 are surrounded to form a fastening thread groove 24 to ensure the accuracy of the installation of the second latch 18. Then the fastening ring 25 is tightened on the threaded support plate 22 until it is fixed in the fastening thread groove 24. At the same time, the support column 19 is inserted into the limit head 26 to ensure the accuracy of the installation of the fastening ring 25, so as to fix the arc extinguishing grid 2 on the housing 1. Through the cooperation of the fastening ring 25, the threaded support plate 22 and the support column 19, the arc-extinguishing grid 2 can be quickly loaded and unloaded, and the damaged part can be flexibly replaced during inspection and maintenance, which is more flexible and convenient to use, can also greatly reduce the maintenance cost, and is more practical.

[0042] In order to achieve the effect of easy use, the housing 1 is made of melamine board, and the left and right side walls of the housing 1 are provided with guide grooves 27, and the arc-extinguishing grid 2 is inserted into the guide grooves 27. The housing 1 made of melamine board can effectively cool down and avoid the safety hazards caused by excessive temperature. Through the cooperation of the guide grooves 27 and the arc-extinguishing grid 2, the arc-extinguishing grid 2 is inserted into the housing 1 along the guide grooves 27, and the loading and unloading is more stable and convenient.

[0043] The arc extinguishing chamber, the contacts and the working principle and mechanical structure therebetween in the present invention are all prior art, so their detailed working principle and mechanical structure will not be described in detail in this article.

[0044] When the utility model is used, when arc extinguishing is required, the arc extinguishing chamber composed of several arc extinguishing grids 2 is arranged alternately in the vertical direction in the left-right symmetrical direction through the cooperation of the first U-shaped opening 7 and the second U-shaped opening 8, which greatly improves the arc striking effect of the arc extinguishing chamber, can quickly and effectively introduce the arc into the arc extinguishing chamber, thereby improving the arc extinguishing performance, and the arc extinguishing effect is more stable and reliable. In addition, through the cooperation of the baffle plate 9 and the arc pressure plate 10, the arc spraying phenomenon of the arc can be effectively prevented, thereby ensuring the safety of use. In the process of the arc pressure plate 10 turning over, the arc extinguishing performance of the arc extinguishing chamber in the vertical direction is further increased, and at the same time, it can better adapt to the disconnection of the contact, which not only plays a buffering effect, but also improves the arc extinguishing effect. Then, in the cooperation of the housing 1 and the insulating plate 12, the arc extinguishing chamber is enclosed to avoid the rear end of the arc extinguishing grid 2 being directly exposed, thereby avoiding damage such as rust from the environment, effectively improving the protection of use, and the insulating plate 12 can also play an insulating role, further improving the safety of use.

[0045] When the arc extinguishing grid 2 needs to be replaced, the arc extinguishing grid 2 is inserted into the housing 1 along the guide groove 27. Through the cooperation of the first latch 15 and the first slot 17 and the cooperation of the second latch 18 and the second slot 21, the first latch 15 is tightly inserted into the first slot 17, and the second latch 18 is tightly inserted into the second slot 21 to ensure the accuracy of the installation of the arc extinguishing grid 2. Then, the fastening ring 25 is tightened on the threaded support plate 22 until it is fixed in the fastening thread groove 24. At the same time, the support column 19 is inserted into the limit head 26, so that the arc extinguishing grid 2 is fixed on the housing 1. Through the cooperation of the fastening ring 25, the threaded support plate 22 and the support column 19, the arc extinguishing grid 2 can be quickly loaded and unloaded. When it needs to be taken out, the fastening ring 25 can be unscrewed to pull the arc extinguishing grid 2 out of the housing 1. The installation and removal are more convenient and efficient. The damaged part can be flexibly replaced during inspection and maintenance. The use is more flexible and convenient, and the maintenance cost can be greatly reduced, and the practicality is stronger.

[0046] On the other hand, a circuit breaker is provided, comprising a circuit breaker of the arc extinguishing device of the above embodiment.

[0047] The utility model is easy to operate and has strong practicality. Through the cooperation of the arc extinguishing grid 2, the first U-shaped opening 7, the second U-shaped opening 8, the arc pressing plate 10 and the insulating plate 12, the arc can be quickly and effectively introduced into the arc extinguishing chamber, the arc extinguishing effect is more stable and reliable, and the arc spraying phenomenon can be effectively prevented, thereby ensuring safety in use. With the cooperation of the shell 1 and the insulating plate 12, the arc extinguishing chamber is enclosed to avoid direct exposure of the rear end of the arc extinguishing grid 2, thereby avoiding damage such as rust caused by the environment, effectively improving the protectiveness of use, and the insulating plate 12 can also play an insulating role, further improving safety in use. Through the cooperation of the first latch 15, the first slot 17, the second latch 18, the second slot 21, the threaded support plate 22 and the fastening ring 25, the arc extinguishing grid 2 is inserted into the housing 1 along the guide groove 27, and then the first latch 15 is tightly inserted into the first slot 17, and the second latch 18 is tightly inserted into the second slot 21, and then the fastening ring 25 is tightened on the threaded support plate 22 until it is fixed in the fastening thread groove 24, so that the arc extinguishing grid 2 is fixed to the housing 1, and the arc extinguishing grid 2 can be quickly loaded and unloaded. When it needs to be taken out, the fastening ring 25 can be unscrewed to pull the arc extinguishing grid 2 out of the housing 1, and the installation and removal are more convenient and efficient. The damaged part can be flexibly replaced during inspection and maintenance, the use is more flexible and convenient, and the maintenance cost can be greatly reduced, and the practicality is stronger.

Claims

1. A circuit breaker arc extinguishing device, comprising a U-shaped housing, characterized in that: A plurality of arc-extinguishing grids arranged at intervals in the vertical direction are detachably installed in the shell, and two adjacent arc-extinguishing grids are arranged alternately in front and back directions. The left and right sides of the arc-extinguishing grids are respectively fixedly connected with a first fastener and a second fastener for assembling the arc-extinguishing grids. A barrier is fixedly installed on the inner side wall of the arc-extinguishing grids near the top of the shell, and an insulating member is fixedly connected to the top of the shell; The arc-extinguishing grid comprises a first U-shaped opening and a second U-shaped opening, wherein the first U-shaped opening is opened at the front end of the arc-extinguishing grid, and the second U-shaped opening is opened at the right side of the rear end of the first U-shaped opening; The barrier member includes a baffle and an arc-suppressing plate. The front end of the baffle is provided with a third U-shaped opening adapted to the arc-extinguishing grid. The arc-suppressing plate is hinged at the rear end of the third U-shaped opening. The arc-suppressing plate can be flipped between the baffle and the insulating member.

2. The circuit breaker arc extinguishing device according to claim 1, characterized in that: The insulating member comprises an insulating plate, the insulating plate is fixedly connected to the top end of the shell, and an arc-shaped plate adapted to the arc-extinguishing grid is formed in the middle of the insulating plate.

3. The circuit breaker arc extinguishing device according to claim 2, characterized in that: The blocking member further comprises a spring, the bottom end of the spring is fixedly connected to the arc-pressing plate, and the top end of the spring is fixedly connected to the arc-shaped plate.

4. The arc extinguishing device for circuit breaker according to claim 1, characterized in that: The first fastener comprises a first latch fixedly connected to the left side of the arc-extinguishing grid, and a positioning column is fixedly connected to the rear end of the first latch.

5. The arc extinguishing device for circuit breaker according to claim 4, characterized in that: The front end of the housing is provided with a first card slot which opens forward, the first card slot is adapted to the first latch pin, the first latch pin is inserted into the first card slot, and the positioning column is clamped at the rear end of the first card slot.

6. The circuit breaker arc extinguishing device according to claim 1, characterized in that: The second fastener comprises a second latch fixedly connected to the right side of the arc extinguishing grid, a rear end of the second latch is fixedly connected to a support column, and a first thread groove is formed on the outer surface of the second latch close to the support column.

7. The arc extinguishing device for circuit breaker according to claim 6, characterized in that: The front end of the shell is provided with a second card slot opening forward, the second card slot is adapted to the second pin, the second pin is inserted into the second card slot, the rear end of the second card slot is fixedly connected to a threaded support plate, the outer surface of the shell close to the threaded support plate is provided with a second thread slot adapted to the first thread slot, the support column is inserted into the threaded support plate, and the first thread slot and the second thread slot are combined to form a fastening thread slot.

8. The arc extinguishing device for circuit breaker according to claim 7, characterized in that: The outer ring surface of the threaded support plate is threadedly connected with a fastening ring, the bottom end of the fastening ring is threadedly installed in the fastening thread groove, the top end of the fastening ring forms a limiting head, and the support column is clamped in the limiting head.

9. The arc extinguishing device for circuit breaker according to claim 1, characterized in that: The shell is made of melamine board, and the left and right side walls of the shell are both provided with guide grooves, and the arc-extinguishing grids are inserted into the guide grooves.

10. A circuit breaker, characterized in that: It comprises the arc extinguishing device of a circuit breaker according to any one of claims 1 to 9.

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