Arc extinguish chamber and circuit breaker

Abstract

An arc extinguish chamber and a circuit breaker relate to the low-voltage electrical technology field. The utility model provides an arc extinguish chamber. The arc extinguish chamber comprises a shell, a grid piece assembly and an arc striking piece, the arc striking sheet comprises a first horizontal part, a bent part and a second horizontal part which are arranged in sequence; the first horizontal part and the second horizontal part are respectively parallel to the side wall of the shell and are limited in the shell; the first horizontal part is arranged between the grid piece assembly and the side wall. According to the arc extinguish chamber obtained by the design, the end part of the arc striking sheet is limited between the grid sheet assembly and the side wall of the shell, so that the arc striking sheet is prevented from being heated, bent and deformed when the circuit breaker breaks an arc, the arc striking effect is ensured, and the arc extinguish reliability is improved.

Description

Technical Field

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

[0002] Circuit breakers are primarily used to connect, carry, and interrupt current under normal circuit conditions. They should also close, carry, and interrupt current under abnormal circuit conditions within a specified timeframe. When interrupting current, if the voltage and current meet the arcing conditions, a high-temperature, intensely hot, and brightly illuminated arc will form between the circuit breaker's moving and stationary contacts.

[0003] As an important component of the circuit breaker, the arc extinguishing chamber plays the role of arc ignition and extinguishing. However, during the circuit breaker breaking test, due to the large energy of the breaking arc, if the arc stays at the arc striking angle of the contact for a long time or passes through it multiple times, it is easy to cause the arc striking piece to be burned thin or burned. At this time, the arc striking piece is easily affected by the electric force, resulting in a change in the bending angle, which in turn leads to a decrease in breaking performance and may even cause the arc striking piece to fall, making the product unable to close or open. Utility Model Content

[0004] The purpose of the utility model is to provide an arc extinguishing chamber, which sets a limit on the end of the arc striking piece to avoid the arc striking piece from being bent and deformed due to heat when the circuit breaker breaks the arc, thereby ensuring the arc striking effect and improving the arc extinguishing reliability.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] In one aspect of the present invention, an arc extinguishing chamber is provided, comprising a shell, a grid assembly and an arc-striking plate arranged in the shell; the arc-striking plate comprises a first horizontal portion, a bent portion and a second horizontal portion arranged in sequence; the first horizontal portion and the second horizontal portion are respectively arranged parallel to the side wall of the shell and limited to the shell; the first horizontal portion is arranged between the grid assembly and the side wall.

[0007] Optionally, the side wall has a first limiting groove arranged along the extension direction of the first horizontal portion, the first limiting groove is arranged on the side of the side wall facing the grid assembly, and the first horizontal portion of the arc-starting plate is at least partially arranged in the first limiting groove.

[0008] Optionally, the side wall has a second limiting groove arranged along the extension direction of the second horizontal portion, the second limiting groove is arranged on the side of the side wall facing the grid assembly, and the second horizontal portion of the arc-starting plate is at least partially arranged in the second limiting groove.

[0009] Optionally, the shell also includes a bottom plate, and the side walls are arranged around the periphery of the bottom plate; the bottom plate has a third limiting groove arranged along the extension direction from the first horizontal part to the second horizontal part, and the first horizontal part and / or the second horizontal part of the arc-starting plate are at least partially arranged in the third limiting groove.

[0010] Optionally, the first limiting groove and the second limiting groove are connected.

[0011] Optionally, a first mounting hole is provided on the side wall, and a second mounting hole is provided on the second horizontal portion corresponding to the first mounting hole, and the second mounting hole is used for passing a fixing piece.

[0012] Optionally, the grid assembly includes a plurality of arc-extinguishing grids arranged at intervals along a first direction, and the arc-extinguishing chamber also includes a gas-producing part, which is arranged on one side of the opening of the grid assembly; the gas-producing part is provided with a plurality of fourth limiting grooves arranged at intervals along the first direction on the side facing the grid assembly, and the fourth limiting grooves are used to clamp the arc-extinguishing grids of the grid assembly; the plurality of fourth limiting grooves correspond one-to-one to the plurality of arc-extinguishing grids.

[0013] Optionally, a fifth limiting groove is provided on one side of the gas-producing part close to the arc-striking plate, and the second direction is perpendicular to the first direction; the fifth limiting groove is adapted to the bending portion of the arc-striking plate, and the bending portion can be arranged in the fifth limiting groove.

[0014] Another aspect of the present invention provides a circuit breaker including the arc extinguishing chamber mentioned above.

[0015] Optionally, the circuit breaker further comprises a moving contact, which is arranged on a side of the arc striking plate of the arc extinguishing chamber facing away from the grid plate assembly.

[0016] The beneficial effects of the utility model include:

[0017] The present application provides an arc extinguishing chamber comprising a housing, a grid assembly disposed within the housing, and an arc-strike plate. The arc-strike plate comprises a first horizontal portion, a bent portion, and a second horizontal portion disposed sequentially. The first and second horizontal portions are respectively disposed parallel to and confined within the housing's sidewalls. The first horizontal portion is disposed between the grid assembly and the sidewalls. The arc extinguishing chamber thus designed prevents the arc-strike plate from being bent or deformed by heat when the circuit breaker interrupts the arc, thereby ensuring arc striking effectiveness and improving arc extinguishing reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a cross-sectional view of a circuit breaker provided in an embodiment of the present utility model;

[0020] Figure 2A second cross-sectional view of a circuit breaker provided in an embodiment of the present utility model;

[0021] Figure 3 This is an enlarged view of the details at A;

[0022] Figure 4 A schematic structural diagram of a gas generating component of an arc extinguishing chamber provided in an embodiment of the present utility model;

[0023] Figure 5 A schematic structural diagram of a circuit breaker provided in an embodiment of the present utility model;

[0024] Figure 6 A third cross-sectional view of a circuit breaker provided in an embodiment of the present utility model;

[0025] Figure 7 This is an exploded view of a circuit breaker provided in an embodiment of the present utility model.

[0026] Icons: 100-arc extinguishing chamber; 110-housing; 111-side wall; 1111-first limiting groove; 112-bottom plate; 120-grid assembly; 121-arc extinguishing grid; 130-arc striking plate; 131-first horizontal portion; 132-bending portion; 133-second horizontal portion; 140-gas generating part; 141-fourth limiting groove; 142-fifth limiting groove; 200-circuit breaker; 210-moving contact; 220-housing; a-first direction; b-second direction. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0032] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] Please refer to Figure 1 、 Figure 2 and Figure 3 This embodiment provides an arc extinguishing chamber 100, including a shell 110, a grid assembly 120 and an arc-starting plate 130 arranged in the shell 110, the grid assembly 120 has an opening for the arc to enter; the arc-starting plate 130 includes a first horizontal portion 131, a bent portion 132 and a second horizontal portion 133 arranged in sequence; an end of the first horizontal portion 131 away from the bent portion 132 extends upward through the opening, the first horizontal portion 131 and the second horizontal portion 133 are respectively arranged parallel to the side wall 111 of the shell 110 and limited to the shell 110; the first horizontal portion 131 is arranged between the grid assembly 120 and the side wall 111.

[0034] Specifically, the present application provides an arc extinguishing chamber 100, which includes a housing 110, a grid assembly 120, and an arc striking plate 130. The arc quickly enters the opening of the grid assembly 120 through the arc striking plate 130 to extinguish the arc. Figure 1 As shown, the grid assembly 120 includes a plurality of arc-extinguishing grids 121 , and the plurality of arc-extinguishing grids 121 are arranged at intervals along a first direction a.

[0035] When the circuit breaker is undergoing a breaking test, due to the large breaking arc energy, if the arc stays at the contact arcing angle for a long time or passes through it multiple times, it is easy to cause the arcing plate to be burned thin or burned. At this time, the existing arcing plate is easily affected by the electric force, causing the bending angle to change, which in turn leads to a decrease in breaking performance, and even causes the arcing plate to fall, making the product unable to close or open the circuit breaker.

[0036] Therefore, in order to prevent the arc-striking piece 130 from being bent and deformed by heat and to ensure the arc-striking effect, as shown in FIG. Figure 2 and Figure 3 As shown, the arc-striking piece 130 in the arc-extinguishing chamber 100 provided in the present application includes a first horizontal portion 131, a bent portion 132, and a second horizontal portion 133, which are arranged in sequence. The bent portion 132 has a V-shaped structure, and the first horizontal portion 131 and the second horizontal portion 133 are respectively arranged at both ends of the bent portion 132. The first horizontal portion 131 and the second horizontal portion 133 are respectively arranged parallel to the side wall 111 of the housing 110 and attached to the housing 110. In order to improve the connection stability between the arc-striking piece 130 and the arc-extinguishing chamber 100 and prevent the arc-striking piece 130 from bending and deforming due to heat, the first horizontal portion 131 of the arc-striking piece 130 is arranged between the grid assembly 120 and the side wall 111. Through this arrangement, the opposite sides of the first horizontal portion 131 of the arc-striking piece 130 can be clamped and limited to prevent the arc-striking piece 130 from bending and deforming due to heat when the circuit breaker 200 interrupts the arc, thereby ensuring the arc-striking effect and improving the arc-extinguishing reliability.

[0037] The arc extinguishing chamber 100 obtained by the above design limits the end of the arc striking piece 130 between the grid assembly 120 and the side wall 111 of the shell 110 to avoid the arc striking piece 130 from being bent and deformed due to heat when the circuit breaker 200 interrupts the arc, thereby ensuring the arc striking effect and improving the arc extinguishing reliability.

[0038] In one embodiment of the present application, please refer to Figure 6 and Figure 7 The side wall 111 has a first limiting groove 1111 arranged along the extension direction of the first horizontal portion 131. The first limiting groove 1111 is arranged on the side of the side wall 111 facing the grid assembly 120, and the first horizontal portion 131 of the arc-starting plate 130 is at least partially arranged in the first limiting groove 1111.

[0039] Specifically, as shown in Figures 6 and Figure 7As shown, in order to further clamp and limit the first horizontal portion 131 of the arc-striking piece 130, the side wall 111 is provided with a first limiting groove 1111. The first limiting groove 1111 is provided on the side of the side wall 111 facing the grid assembly 120. Furthermore, the first horizontal portion 131 of the arc-striking piece 130 can be provided in the first limiting groove 1111 to further limit the end of the arc-striking piece 130, thereby preventing the arc-striking piece 130 from bending due to heat or falling between the side wall 111 and the grid assembly 120. In order to further enhance the limiting effect of the first limiting groove 1111 on the arc-striking piece 130, the first horizontal portion 131 of the arc-striking piece 130 can also be screwed to the inner wall of the first limiting groove 1111 to enhance the connection stability between the arc-striking piece 130 and the first limiting groove 1111.

[0040] The present application does not impose any restrictions on the depth of the first limiting groove 1111. When the first horizontal portion 131 of the arc-striking piece 130 is disposed within the first limiting groove 1111, it is at least partially disposed within the first limiting groove 1111 to ensure that when the arc-striking piece 130 is heated, the first limiting groove 1111 can limit and fix the first horizontal portion 131 of the arc-striking piece 130, thereby preventing the arc-striking piece 130 from bending, deforming, or falling off. Preferably, in order to further limit and fix the end of the arc-striking piece 130, the first horizontal portion 131 of the arc-striking piece 130 can be completely disposed within the first limiting groove 1111.

[0041] In one embodiment of the present application, the side wall 111 has a second limiting groove arranged along the extension direction of the second horizontal portion 133, and the second limiting groove is arranged on the side of the side wall 111 facing the grid assembly 120. Furthermore, the second horizontal portion 133 of the arc-starting plate 130 is at least partially arranged in the second limiting groove.

[0042] Specifically, in order to further limit the second horizontal portion 133 of the arc-striking piece 130, the side wall 111 is provided with a second limiting groove, and the second horizontal portion 133 of the arc-striking piece 130 can be arranged in the second limiting groove to further limit the end of the arc-striking piece 130.

[0043] By setting the first limiting groove 1111 and the second limiting groove, the opposite ends of the arc-striking piece 130 can be limited, preventing the arc-striking piece 130 from being bent and deformed due to heat when the circuit breaker 200 breaks the arc, thereby ensuring the arc-striking effect and improving the arc-extinguishing reliability.

[0044] The present application does not impose any restrictions on the depth of the second limiting groove. When the second horizontal portion 133 of the arc-striking piece 130 is disposed in the second limiting groove, it is at least partially disposed in the second limiting groove to ensure that when the arc-striking piece 130 is heated, the second limiting groove can limit the second horizontal portion 133 of the arc-striking piece 130 and prevent the arc-striking piece 130 from bending, deforming, or falling off due to heat. Preferably, in order to further limit and fix the end of the arc-striking piece 130, the second horizontal portion 133 of the arc-striking piece 130 can be completely disposed in the second limiting groove.

[0045] In another embodiment of the present application, a third limiting groove may be provided. The housing 110 further includes a bottom plate 112, with sidewalls 111 disposed around the periphery of the bottom plate 112. The housing 110 of the arc extinguishing chamber 100 further includes a bottom plate 112, with sidewalls 111 disposed around the periphery of the bottom plate 112 to form a receiving cavity with the bottom plate 112. The grid assembly 120 and the arc-starting plate 130 are disposed within the receiving cavity. The first horizontal portion 131 and the second horizontal portion 133 are respectively disposed parallel to the sidewalls 111 of the housing 110 along the first direction a.

[0046] The third limiting groove is provided on the bottom plate 112 along the extending direction from the first horizontal portion 131 to the second horizontal portion 133 and is provided toward the side edge of the arc-striking piece 130. In one optional solution of the present application, the third limiting groove is adapted to the first horizontal portion 131 of the arc-striking piece 130, and the first horizontal portion 131 can be at least partially disposed within the third limiting groove. In another optional solution of the present application, the third limiting groove is adapted to the second horizontal portion 133 of the arc-striking piece 130, and the second horizontal portion 133 is at least partially disposed within the third limiting groove. In another optional solution of the present application, the third limiting groove is adapted to the entire arc-striking piece 130, so that both the first horizontal portion 131 and the second horizontal portion 133 can be disposed within the third limiting groove. Furthermore, the first horizontal portion 131 can be at least partially disposed within the third limiting groove, and the second horizontal portion 133 can be at least partially disposed within the third limiting groove.

[0047] It should be noted that, the arc extinguishing chamber 100 of the present application can, through the setting of the first limiting groove 1111, enable the first horizontal portion 131 of the arc-striking piece 130 to press against the inner surface of the first limiting groove when heated, thereby preventing the arc-striking piece 130 from being deformed by heat; and the setting of the second limiting groove and the third limiting groove can be adjusted according to actual production needs. The present application does not impose any restrictions on the setting of the second limiting groove and the third limiting groove. The arc extinguishing chamber 100 of the present application can simultaneously set the first limiting groove 1111, the second limiting groove and the third limiting groove to limit the opposite ends and side edges of the arc-striking piece 130, so as to prevent the arc-striking piece 130 from being deformed or falling off due to heat to the greatest extent; of course, the arc extinguishing chamber 100 of the present application 00 can also set a first limiting groove 1111 and a second limiting groove, or set a first limiting groove 1111 or a third limiting groove to achieve the limitation of the opposite ends of the arc-striking plate 130, or to achieve the limitation of the first horizontal portion 131 and the side edge of the arc-striking plate to prevent the arc-striking plate 130 from being deformed or falling off due to heat; of course, in addition to the above two possible implementation methods, the arc extinguishing chamber 100 of the present application can also only set the first limiting groove 1111, and the second horizontal portion 133 and the bent portion 132 will be deformed toward one side of the first horizontal portion 131 due to the influence of heat and electric force, and the first horizontal portion 131 can be limited and abutted with the inner side wall of the first limiting groove 1111 to prevent the arc-striking plate 130 from being deformed or falling off.

[0048] For example, in one possible embodiment of the present application, in order to improve the space utilization rate in the arc extinguishing chamber 100 while ensuring the arc extinguishing efficiency, the arc-striking plate 130 is extended along the second direction b, wherein the second direction b is perpendicular to the first direction a. The first limiting groove 1111 and the second limiting groove provided on the side wall 111 are arranged side by side along the extension direction of the arc-striking plate 130, that is, the first limiting groove 1111 and the second limiting groove are arranged side by side along the second direction b and are separated from each other to respectively match the layout positions of the first horizontal portion 131 and the second horizontal portion 133 of the arc-striking plate 130. Optionally, in another possible embodiment of the present application, the first limiting groove 1111 and the second limiting groove can also be connected to further improve the convenience of assembling the first horizontal portion 131 and the second horizontal portion 133 of the arc-striking plate 130 with the first limiting groove 1111 and the second limiting groove respectively.

[0049] In one possible implementation of the present application, the side wall 111 is provided with a first mounting hole, and the second horizontal portion 133 is provided with a second mounting hole corresponding to the first mounting hole, and the second mounting hole is used to pass a fixing piece.

[0050] Specifically, a first mounting hole is provided on the side wall 111 of the shell 110, and correspondingly, a second mounting hole is provided on the second horizontal portion 133. The first mounting hole and the second mounting hole are used to pass through a fixing piece, and the fixing piece passes through the second mounting hole and the first mounting hole in sequence, so that the second horizontal portion 133 of the arc-striking piece 130 is fixed to the side wall 111 of the shell 110, thereby limiting and fixing the second horizontal portion 133 of the arc-striking piece 130, so as to avoid the arc-striking piece 130 from being bent and deformed due to heat when the circuit breaker 200 breaks the arc, thereby ensuring the arc-striking effect.

[0051] Alternatively, as Figure 4 As shown, the grid assembly 120 includes a plurality of arc-extinguishing grids 121 arranged at intervals along the first direction a, and the arc-extinguishing chamber 100 also includes a gas-generating component 140, which is arranged on one side of the opening of the grid assembly 120; the gas-generating component 140 is provided with a plurality of fourth limiting grooves 141 arranged at intervals along the first direction a on the side facing the grid assembly 120, and the fourth limiting grooves 141 are used to clamp the arc-extinguishing grids 121 of the grid assembly 120; the plurality of fourth limiting grooves 141 correspond one-to-one to the plurality of arc-extinguishing grids 121.

[0052] Specifically, the arc extinguishing chamber 100 further includes a gas generating member 140, which is disposed on the side of the grid assembly 120 facing the arc striking member 130; in order to improve the connection stability between the gas generating member 140 and the grid assembly 120, as shown in FIG. Figure 4 As shown, the gas generating part 140 is provided with a plurality of fourth limiting grooves 141 spaced apart along the first direction a on one side facing the grid assembly 120 . The fourth limiting grooves 141 are used to clamp the arc extinguishing grid 121 of the grid assembly 120 , and an arc extinguishing grid 121 is clamped in each fourth limiting groove 141 .

[0053] By setting the gas-generating component 140, gas can be quickly generated when an arc is generated, so that the arc moves faster into the grid assembly 120 under the action of the magnetic field and airflow and is finally extinguished, thereby improving the arc extinguishing efficiency and reliability of the arc extinguishing chamber 100.

[0054] In one embodiment of the present application, Figure 4 As shown, a fifth limiting groove 142 is provided on one side of the gas-producing part 140 close to the arc-striking plate 130 along the second direction b, and the second direction b is perpendicular to the first direction a; the fifth limiting groove 142 is adapted to the bending portion 132 of the arc-striking plate 130, and the bending portion 132 can be set in the fifth limiting groove 142.

[0055] Specifically, the gas-generating element 140 is disposed at one end of the grid assembly 120 near the opening of the housing 110, and the arc-striking plate 130 is located to the side of the gas-generating element 140. A fifth retaining groove 142 is provided on the side of the gas-generating element 140 near the arc-striking plate 130. The fifth retaining groove 142 extends along the second direction b. The fifth retaining groove 142 has a V-shaped structure to mate with the bent portion 132 of the arc-striking plate 130. The bent portion 132 can be retained within the fifth retaining groove 142, thereby securing the arc-striking plate 130 in the second direction b. This prevents the arc-striking plate 130 from bending and deforming in the second direction b due to heat, further ensuring the arc-striking effect and arc-extinguishing reliability of the arc-extinguishing chamber 100.

[0056] In another aspect of the embodiments of the present application, a circuit breaker 200 is provided, which includes the arc extinguishing chamber 100 described above.

[0057] Specifically, if Figure 5 As shown, the present application also provides a circuit breaker 200, which includes the above-mentioned housing 220 and the above-mentioned arc extinguishing chamber 100, and the arc extinguishing chamber 100 is arranged in the housing 220. A moving contact 210 and a static contact are also provided in the housing 220. The arc extinguishing chamber 100 can strike and extinguish the arc generated by the moving contact 210 and the static contact when closing or opening the circuit breaker, thereby improving the reliability of the circuit breaker 200. Among them, the specific structure and beneficial effects of the arc extinguishing chamber 100 have been introduced in detail above and will not be repeated here. The circuit breaker 200 obtained by the above design can ensure that the arc striking piece 130 in the arc extinguishing chamber 100 does not deform or bend when heated, thereby improving the breaking performance of the circuit breaker 200 and ensuring the reliability of the opening and closing of the circuit breaker 200.

[0058] Furthermore, if Figure 1 As shown, the circuit breaker 200 further includes a moving contact 210, which is disposed on a side of the arc-strike plate 130 of the arc-extinguishing chamber 100 that faces away from the grid assembly 120. When the moving contact 210 moves toward the static contact to close with the static contact, the generated arc can enter the arc-extinguishing chamber 100 through the opening of the housing 110 of the arc-extinguishing chamber 100 and quickly enter the grid assembly 120 through the arc-strike plate 130 for arc extinguishing, thereby improving arc extinguishing efficiency and reliability.

[0059] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. An arc extinguishing chamber, characterized in that: The invention comprises a shell (110), a grid assembly (120) and an arc-starting plate (130) arranged in the shell (110); the arc-starting plate (130) comprises a first horizontal portion (131), a bent portion (132) and a second horizontal portion (133) arranged in sequence; the first horizontal portion (131) and the second horizontal portion (133) are respectively arranged parallel to the side wall (111) of the shell (110) and are limited to the shell (110); the first horizontal portion (131) is arranged between the grid assembly (120) and the side wall (111).

2. The arc extinguishing chamber according to claim 1, characterized in that: The side wall (111) has a first limiting groove (1111) arranged along the extension direction of the first horizontal portion (131), the first limiting groove (1111) is arranged on the side of the side wall (111) facing the grid plate assembly (120), and the first horizontal portion (131) of the arc-starting plate (130) is at least partially arranged in the first limiting groove (1111).

3. The arc extinguishing chamber according to claim 2, characterized in that: The side wall (111) has a second limiting groove arranged along the extension direction of the second horizontal portion (133), the second limiting groove is arranged on the side of the side wall (111) facing the grid plate assembly (120), and the second horizontal portion (133) of the arc-starting plate (130) is at least partially arranged in the second limiting groove.

4. The arc extinguishing chamber according to claim 2, characterized in that: The shell (110) also includes a bottom plate (112), and the side wall (111) is arranged around the periphery of the bottom plate (112); the bottom plate (112) has a third limiting groove arranged along the extension direction from the first horizontal portion (131) to the second horizontal portion (133), and the first horizontal portion (131) and / or the second horizontal portion (133) of the arc-starting plate (130) are at least partially arranged in the third limiting groove.

5. The arc extinguishing chamber according to claim 3, characterized in that: The first limiting groove and the second limiting groove are communicated with each other.

6. The arc extinguishing chamber according to claim 1, characterized in that: The side wall (111) is provided with a first mounting hole, and the second horizontal portion (133) is provided with a second mounting hole corresponding to the first mounting hole, and the second mounting hole is used for passing a fixing piece.

7. The arc extinguishing chamber according to claim 1, characterized in that: The grid assembly (120) comprises a plurality of arc-extinguishing grids (121) arranged at intervals along a first direction (a); the arc-extinguishing chamber (100) further comprises a gas-generating component (140), the gas-generating component (140) being arranged on one side of an opening of the grid assembly (120); a plurality of fourth limiting grooves (141) arranged at intervals along the first direction (a) are provided on a side of the gas-generating component (140) facing the grid assembly (120); the fourth limiting grooves (141) are used to clamp the arc-extinguishing grids (121) of the grid assembly (120); and the plurality of fourth limiting grooves (141) correspond one-to-one to the plurality of arc-extinguishing grids (121).

8. The arc extinguishing chamber according to claim 7, characterized in that: A fifth limiting groove (142) is provided on one side of the gas-generating part (140) close to the arc-striking plate (130) and arranged along a second direction (b), and the second direction (b) is perpendicular to the first direction (a); the fifth limiting groove (142) is adapted to the bending portion (132) of the arc-striking plate (130), and the bending portion (132) can be arranged in the fifth limiting groove (142).

9. A circuit breaker, characterized in that: The arc extinguishing chamber (100) comprises the arc extinguishing chamber (100) according to any one of claims 1 to 8.

10. The circuit breaker according to claim 9, characterized in that The circuit breaker (200) further comprises a moving contact (210), wherein the moving contact (210) is arranged on a side of the arc striking piece (130) of the arc extinguishing chamber (100) facing away from the grid piece assembly (120).

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