Arc extinguish chamber and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an arc extinguish chamber and a circuit breaker. The arc extinguishing chamber comprises a shell, an arc extinguishing device, an end cover and a pressing piece, an opening is formed in the upper end of the shell, and the arc extinguishing device is arranged in the shell. The end cover is arranged at the opening of the shell in a covering mode, an exhaust hole is formed in the end cover, and gas in the shell can be exhausted out of the arc extinguishing chamber through the exhaust hole. The pressing piece abuts against the outer side face of the end cover, and the pressing piece is fixedly connected with a base of the circuit breaker. According to the arc extinguish chamber provided by the utility model, the pressing piece is arranged on the outer side surface of the end cover to abut against the end cover, so that the structural strength of the end cover is enhanced, the end cover is prevented from being punched through when being impacted by gas, an arc extinguish device in the arc extinguish chamber is prevented from flying out, and the arc extinguish effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing chamber and a circuit breaker. Background Art

[0002] The arc extinguishing chamber is an important component of the universal circuit breaker, and it has a particularly important influence on the arc extinguishing performance. Especially when the high current is interrupted, a large amount of high-temperature and high-pressure ionized gas will be generated when the arc burns. If these gases cannot be quickly cooled, recombined, deionized and then discharged inside the arc extinguishing chamber of the phase, the high-temperature and high-pressure gas will leak to the adjacent phase or contact the grounded metal outside the circuit breaker, which will cause phase-to-phase and grounding short circuit faults, the arc cannot be extinguished, and the interruption failure occurs.

[0003] With the expansion of the application environment of universal circuit breakers, universal circuit breakers are required to have higher breaking capacity. The arc extinguishing chamber of existing circuit breakers has limited effect, and the upper end cover of the arc extinguishing chamber is prone to be punched through, causing the arc extinguishing plate and gasket inside the arc extinguishing chamber to fly out from the inside of the base, causing the arc extinguishing chamber to fail and the contacts to burn seriously, endangering personal safety and reducing the performance of the circuit breaker.

[0004] Therefore, there is an urgent need for an arc extinguishing chamber and a circuit breaker to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an arc extinguishing chamber and a circuit breaker, which solves the problem that the end cover of the arc extinguishing chamber is easily punched through, avoids failure of the arc extinguishing chamber, and helps to improve the safety performance of the circuit breaker.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Interrupter, including:

[0008] A shell body, with an opening at the upper end;

[0009] An arc extinguishing device, wherein the arc extinguishing device is arranged in the housing;

[0010] An end cover, the end cover is arranged at the opening of the shell, and the end cover is provided with an exhaust hole, through which the gas in the shell can be discharged to the outside of the arc extinguishing chamber;

[0011] A pressing piece is pressed against the outer surface of the end cover and is connected and fixed to the base of the circuit breaker.

[0012] As an optional solution for the above-mentioned arc extinguishing chamber, avoidance grooves are provided at both ends of the end cover, and the pressing piece includes a pressing portion and a connecting portion connected to each other, the pressing portion presses against the outer surface of the end cover, the connecting portion presses against the bottom of the avoidance groove, and the connecting portion is fixed in the avoidance groove by a fastener.

[0013] As an optional solution of the arc extinguishing chamber, a connecting hole is provided on the pressing piece, and the connecting hole is connected with the exhaust hole.

[0014] As an optional solution of the arc extinguishing chamber, the pressing piece is extended along the length direction of the end cover.

[0015] As an optional solution of the arc extinguishing chamber, the connecting hole is extended along the length direction of the pressing piece.

[0016] As an optional solution for the arc extinguishing chamber, the exhaust holes on the end cover are extended along the width direction of the end cover, and multiple rows of the exhaust holes are arranged along the length direction of the end cover, and the connecting hole is connected to the multiple rows of the exhaust holes.

[0017] As an optional solution of the above arc extinguishing chamber, the pressing piece covers the outer side surface of the end cover.

[0018] As an optional solution of the arc extinguishing chamber, the connecting hole is arranged opposite to the exhaust hole.

[0019] As an optional solution of the arc extinguishing chamber, the communicating holes are extended along the width direction of the pressing piece, and a plurality of rows of communicating holes are arranged along the length direction of the pressing piece.

[0020] The circuit breaker comprises a base and also comprises the arc extinguishing chamber as described above, wherein the arc extinguishing chamber is arranged in the base, and the end cover and the pressing piece are fixed to the base.

[0021] Beneficial effects:

[0022] The arc extinguishing chamber proposed by the utility model has a pressing piece arranged on the outer side surface of the end cover to press the end cover, thereby enhancing the structural strength of the end cover and preventing the end cover from being penetrated when impacted by gas, thereby preventing the arc extinguishing device inside the arc extinguishing chamber from flying out, thereby improving the arc extinguishing effect.

[0023] The circuit breaker provided by the utility model improves the use safety by adopting the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a circuit breaker in the prior art;

[0025] Figure 2 It is a schematic diagram of a partially disassembled structure of a circuit breaker in the prior art;

[0026] Figure 3 It is a structural schematic diagram of a circuit breaker provided in Embodiment 1 of the utility model;

[0027] Figure 4 This is a schematic diagram of a partially disassembled structure of a circuit breaker provided in Embodiment 1 of the utility model;

[0028] Figure 5 It is a structural schematic diagram of a pressing piece provided in the first embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the disassembled structure of the arc extinguishing chamber provided in the first embodiment of the utility model;

[0030] Figure 7 It is a structural schematic diagram of the pressing piece provided in the second embodiment of the present utility model.

[0031] In the figure:

[0032] 100', arc extinguishing chamber; 200', base;

[0033] 1', housing; 2', arc extinguishing device; 3', end cover; 31', exhaust hole; 4', fastener;

[0034] 100, arc extinguishing chamber; 200, base;

[0035] 1. Shell;

[0036] 2. Arc extinguishing device; 21. Grid; 22. Arc extinguishing plate; 23. Gasket;

[0037] 3. End cover; 31. Exhaust hole; 32. Avoidance groove;

[0038] 4. Pressing piece; 41. Pressing portion; 411. Connecting hole; 42. Connecting portion; 421. Connecting hole;

[0039] 5. Fasteners. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] Embodiment 1:

[0045] like Figure 1 and Figure 2 As shown, a circuit breaker in the prior art is shown, including a base 200' and an arc extinguishing chamber 100', the base 200' is provided with a mounting hole, and the arc extinguishing chamber 100' is installed in the base 200' through the mounting hole. The arc extinguishing chamber 100' includes a housing 1', an arc extinguishing device 2' and an end cover 3', the arc extinguishing device 2' is arranged in the housing 1', and the end cover 3' is covered at the opening at the upper end of the housing 1' to cover the arc extinguishing device 2' in the housing 1'. The two ends of the end cover 3' are fixed to the base 200' by fasteners 4', and the fasteners 4' can specifically be screws.

[0046] An exhaust hole 31' is provided on the end cover 3'. When the circuit breaker interrupts a large current, a large amount of gas will be generated in the arc extinguishing chamber 100', and the gas will be discharged from the exhaust hole 31' on the end cover 3'. When the amount of gas generated is too large, it may not be discharged in time, causing the gas to directly penetrate the end cover 3', causing the arc extinguishing device 2' to fly out of the base 200' and lose the arc extinguishing function.

[0047] To solve the above problems, Figure 3 and Figure 4As shown, the present embodiment improves the arc extinguishing chamber 100. Specifically, the arc extinguishing chamber 100 comprises a housing 1, an arc extinguishing device 2, an end cover 3 and a pressing piece 4. An opening is provided at the upper end of the housing 1, the arc extinguishing device 2 is provided in the housing 1, the end cover 3 is covered at the opening of the housing 1, and an exhaust hole 31 is provided on the end cover 3, through which the gas in the housing 1 can be discharged to the outside of the arc extinguishing chamber 100. The pressing piece 4 is pressed against the outer surface of the end cover 3, and the pressing piece 4 is connected and fixed to the base 200 of the circuit breaker.

[0048] By arranging a pressing piece 4 on the outer surface of the end cover 3 to press the end cover 3, the structural strength of the end cover 3 is enhanced to prevent the end cover 3 from being pierced when impacted by gas, thereby preventing the arc extinguishing device 2 inside the arc extinguishing chamber 100 from flying out, thereby improving the arc extinguishing effect.

[0049] Furthermore, if Figure 3 and Figure 5 As shown, in order to facilitate the fixation of the end cover 3 and the pressure piece 4, avoidance grooves 32 are provided at both ends of the end cover 3, and the pressure piece 4 includes a pressing portion 41 and a connecting portion 42 connected to each other, the pressing portion 41 presses on the outer surface of the end cover 3, and the connecting portion 42 presses on the bottom of the avoidance groove 32, and the connecting portion 42 is fixed in the avoidance groove 32 by a fastener 5, and the fastener 5 passes through the connecting portion 42 and the end cover 3 in turn and is threadedly connected to the base 200, thereby fixing the pressure piece 4 and the end cover 3 to the base 200.

[0050] For the existing arc extinguishing chamber 100 and circuit breaker, no additional structural modification is required. A pressing piece 4 can be directly added to the outside of the end cover 3. The added pressing piece 4 can be fixed by using the existing fasteners 5 of the end cover 3 or by replacing the fasteners 5 with slightly longer ones. The improvement cost is low.

[0051] Specifically, the pressing piece 4 is configured to include a pressing portion 41 and two connecting portions 42, so that the pressing piece 4 is in a "F" shape and buckled on the end cover 3, so that it is more convenient to install and position the pressing piece 4. A connecting hole 421 is provided on the connecting portion 42, and the fastener 5 passes through the connecting hole 421 for connection. After the fastener 5 is tightened, it will press against the connecting portion 42, thereby fixing the pressing piece 4.

[0052] Furthermore, combined with Figure 3 and Figure 5 As shown, in order to prevent the pressing piece 4 from blocking the exhaust hole 31 on the end cover 3, a connecting hole 411 is provided on the pressing piece 4, and the connecting hole 411 is connected to the exhaust hole 31 to form a through exhaust channel.

[0053] Specifically, Figure 3As shown, the exhaust holes 31 on the end cover 3 are extended along the width direction of the end cover 3, and multiple rows of exhaust holes 31 are arranged along the length direction of the end cover 3, and the connecting hole 411 is connected to the multiple rows of exhaust holes 31, thereby ensuring that the pressing piece 4 avoids any exhaust hole 31 and ensuring that the exhaust effect of the exhaust hole 31 reaches the best.

[0054] Alternatively, if Figure 5 As shown, the pressing piece 4 is extended along the length direction of the end cover 3, and the two ends of the pressing piece 4 in the length direction are fixed to the end cover 3 by fasteners 5. The pressing piece 4 is specifically configured as an elongated plate-like structure, preferably pressed in the middle position of the end cover 3, and can provide a relatively uniform and stable pressure on the end cover 3.

[0055] Specifically, the communication hole 411 is extended along the length direction of the pressing piece 4 , and the communication hole 411 covers multiple rows of exhaust holes 31 to reduce the obstruction of the exhaust holes 31 .

[0056] By providing a connecting hole 411 on the pressing piece 4, while ensuring that the pressing piece 4 provides a resisting force on the end cover 3, it is also possible to avoid the pressing piece 4 from blocking the exhaust hole 31, so that the gas generated in the arc extinguishing chamber 100 can be discharged from the exhaust hole 31 as much as possible, reducing the risk of the end cover 3 being punctured.

[0057] Furthermore, if Figure 6 As shown, the arc extinguishing device 2 includes a grid 21, an arc extinguishing plate 22 and a gasket 23. Both ends of the grid 21 are plugged into the shell 1. The arc extinguishing plate 22 and the gasket 23 are arranged between the grid 21 and the end cover 3. There are multiple arc extinguishing plates 22 and multiple gaskets 23. Multiple arc extinguishing plates 22 and multiple gaskets 23 are stacked, and a gasket 23 is inserted between every two arc extinguishing plates 22.

[0058] This embodiment also provides a circuit breaker, which includes a base 200 and the above-mentioned arc extinguishing chamber 100. By adopting the above-mentioned arc extinguishing chamber 100, the arc extinguishing effect is improved, which is conducive to improving the safety of the circuit breaker. For other structures of the circuit breaker, conventional structures in the prior art can be adopted, which will not be described in detail here.

[0059] Embodiment 2:

[0060] like Figure 7 As shown, this embodiment provides an arc extinguishing chamber 100 and a circuit breaker, which are basically the same as the first embodiment, and the only difference is the specific structure of the pressing piece 4.

[0061] The pressing piece 4 in this embodiment is wider than the pressing piece 4 in the first embodiment, so that the pressing piece 4 covers the outer side surface of the end cover 3 and provides a wider range of pressure on the end cover 3.

[0062] Furthermore, the connecting hole 411 is arranged opposite to the exhaust hole 31. Since the pressing member 4 covers a relatively large area, the connecting holes 411 are arranged on the pressing member 4 facing the exhaust holes 31, so that all the exhaust holes 31 on the end cover 3 can be completely connected to the outside.

[0063] Specifically, the communication holes 411 are extended along the width direction of the pressing piece 4 , and multiple rows of communication holes 411 are arranged along the length direction of the pressing piece 4 , and each row of communication holes 411 corresponds to a row of exhaust holes 31 on the end cover 3 .

[0064] The connection and fixing method between the pressing piece 4 and the end cover 3 is the same as that in the first embodiment and will not be described in detail here.

[0065] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An arc extinguishing chamber, characterized in that: include: A housing (1) having an opening at the upper end; An arc extinguishing device (2), the arc extinguishing device (2) being arranged in the housing (1); An end cover (3), the end cover (3) being arranged at the opening of the shell (1), and the end cover (3) being provided with an exhaust hole (31), through which the gas in the shell (1) can be discharged to the outside of the arc extinguishing chamber; A pressing piece (4), the pressing piece (4) is pressed against the outer surface of the end cover (3), and the pressing piece (4) is connected and fixed to the base (200) of the circuit breaker.

2. The arc extinguishing chamber according to claim 1, characterized in that: Both ends of the end cover (3) are provided with avoidance grooves (32); the pressing member (4) comprises a pressing portion (41) and a connecting portion (42) connected to each other; the pressing portion (41) presses against the outer surface of the end cover (3); the connecting portion (42) presses against the bottom of the avoidance groove (32); and the connecting portion (42) is fixed in the avoidance groove (32) by a fastener (5).

3. The arc extinguishing chamber according to claim 1, characterized in that: The pressing piece (4) is provided with a connecting hole (411), and the connecting hole (411) is connected to the exhaust hole (31).

4. The arc extinguishing chamber according to claim 3, characterized in that: The pressing piece (4) is extended along the length direction of the end cover (3).

5. The arc extinguishing chamber according to claim 4, characterized in that: The communicating hole (411) is extended along the length direction of the pressing piece (4).

6. The arc extinguishing chamber according to claim 5, characterized in that: The exhaust holes (31) on the end cover (3) are arranged to extend along the width direction of the end cover (3), and a plurality of rows of the exhaust holes (31) are arranged along the length direction of the end cover (3), and the connecting hole (411) is connected to the plurality of rows of the exhaust holes (31).

7. The arc extinguishing chamber according to claim 3, characterized in that: The pressing piece (4) covers the outer side surface of the end cover (3).

8. The arc extinguishing chamber according to claim 7, characterized in that: The communication hole (411) is arranged opposite to the exhaust hole (31).

9. The arc extinguishing chamber according to claim 8, characterized in that: The communicating holes (411) are arranged to extend along the width direction of the pressing piece (4), and a plurality of rows of communicating holes (411) are arranged along the length direction of the pressing piece (4).

10. A circuit breaker, comprising a base (200), characterized in that: It also comprises an arc extinguishing chamber as claimed in any one of claims 1 to 9, wherein the arc extinguishing chamber is arranged in the base (200), and the end cover (3) and the pressing piece (4) are fixed to the base (200).

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