An arc extinguishing chamber and molded case circuit breaker

Abstract

The application discloses an arc-extinguishing chamber, which comprises symmetrically arranged arc-extinguishing walls, which enclose an arc-extinguishing cavity for arc extinguishing, the arc-extinguishing cavity comprising an arc inlet for the electric arc to enter the arc-extinguishing cavity and an arc outlet for discharging metal particles; first and second gas production covers for producing gas under the high temperature of the electric arc to blow the electric arc, the gas production covers being symmetrically and spacedly arranged and forming a passing area for the moving contact to pass through, the passing area covering the arc inlet and expanding towards the arc inlet; and arc-extinguishing fins arranged in layers in the arc-extinguishing cavity, the adjacent arc-extinguishing fins being connected to the arc-extinguishing walls in a staggered mode at the arc outlet. The application sets the passing area structure to expand towards the arc outlet direction of a group of gas production covers, so as to accelerate the dispersion of the electric arc in the passing area, so that the electric arc is quickly extinguished by the arc-extinguishing fins, and meanwhile, the adjacent arc-extinguishing fins are connected to the arc-extinguishing walls in a staggered mode at the arc outlet, so as to avoid the arc-extinguishing fins from being blocked by the metal particles and losing effectiveness. The application further provides a molded case circuit breaker provided with the arc-extinguishing chamber.

Description

Technical Field

[0001] This invention relates to the field of arc extinguishing technology, and particularly to an arc extinguishing chamber and a molded case circuit breaker. Background Technology

[0002] An arc-extinguishing chamber is a device used to confine the spatial location of an electric arc and accelerate its extinction. It introduces the electric arc into the chamber and assists in its extinction. It is often installed inside a circuit breaker to accelerate the extinguishing of the electric arc generated when the moving and stationary contacts of the circuit breaker open during the circuit breaker's breaking action.

[0003] However, in existing molded case circuit breakers, the arc enters the arc-extinguishing chamber slowly when the moving and stationary contacts open, resulting in a slow arc-extinguishing speed. Simultaneously, the arc burns between the arc-extinguishing plates after entering the chamber, generating a large number of metal particles. These metal particles typically exit from the ends of the arc-extinguishing plates and accumulate on both sides of the ends. Repeated accumulation of metal particles can clog adjacent arc-extinguishing plates, causing two plates to function as only one, thus weakening the arc-cutting effect and resulting in poor arc extinguishing performance.

[0004] Therefore, how to improve the arc extinguishing speed of the arc extinguishing chamber is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an arc-extinguishing chamber to improve the arc-extinguishing speed of the arc-extinguishing chamber.

[0006] Another object of the present invention is to provide a molded case circuit breaker comprising the above-mentioned arc-extinguishing chamber.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An arc-extinguishing chamber, comprising

[0009] Symmetrically arranged arc-extinguishing walls surround an arc-extinguishing cavity for extinguishing an arc. The arc-extinguishing cavity includes an inlet for the electric arc to enter the arc-extinguishing cavity and an outlet for discharging metal particles.

[0010] The first gas generating hood and the second gas generating hood are used to generate gas under the high temperature of the electric arc to blow the electric arc. The first gas generating hood and the second gas generating hood are symmetrically arranged and spaced apart to form a passage area for the moving contact to pass through. The passage area covers the arc inlet and expands toward the arc inlet.

[0011] An arc-extinguishing grid is provided, with multiple arc-extinguishing grids stacked in the arc-extinguishing cavity, and adjacent arc-extinguishing grids being staggered and connected to the arc-extinguishing wall at the arc outlet.

[0012] Preferably, in the arc-extinguishing chamber, a first arc-extinguishing plate is provided on the side of the arc-extinguishing cavity away from the stationary contact. The distance between the first arc-extinguishing plate and the adjacent arc-extinguishing grid plate near the arc outlet is a first distance, which is the minimum distance between the first arc-extinguishing plate and the adjacent arc-extinguishing grid plate.

[0013] Preferably, in the arc-extinguishing chamber, after the moving contact separates from the stationary contact, it passes through the passage area along a first direction, and the cross-sectional dimension of the first gas-generating hood in the first direction gradually increases to ensure sufficient gas generation.

[0014] Preferably, in the arc-extinguishing chamber, the cross-sectional dimension of the first gas-generating hood in the first direction changes from small to large and then from large to small again, and the moving contact passes through the entire cross-sectional dimension change area of ​​the first gas-generating hood after separating from the stationary contact.

[0015] Preferably, in the arc-extinguishing chamber, the first gas-generating hood and the second gas-generating hood are disposed on the inner wall of the arc-extinguishing chamber, and a portion of the arc-extinguishing grid plate is wrapped by the first gas-generating hood and the second gas-generating hood.

[0016] Preferably, in the arc-extinguishing chamber, the multiple arc-extinguishing grids are of the same structure, the arc-extinguishing grids are asymmetrical in the direction perpendicular to the multiple arc-extinguishing grids, and adjacent arc-extinguishing grids are arranged alternately.

[0017] Preferably, in the arc-extinguishing chamber, multiple sets of slots are provided on the arc-extinguishing wall, and multiple arc-extinguishing grid plates are snapped and fixed on the arc-extinguishing wall.

[0018] Preferably, in the arc-extinguishing chamber, the arc-extinguishing grid has a groove, and the groove is oriented toward the passage area.

[0019] A molded case circuit breaker is provided with an arc-extinguishing chamber as provided in any of the above embodiments.

[0020] Preferably, the above-mentioned molded case circuit breaker includes a moving contact and a stationary contact, wherein when the moving contact is in the maximum open state, the moving silver point of the moving contact is located within the coverage area of ​​the passage zone.

[0021] As can be seen from the above technical solution, the arc-extinguishing chamber provided by the present invention includes an arc-extinguishing wall, a first gas-generating hood, a second gas-generating hood, and an arc-extinguishing grid. Two arc-extinguishing walls are provided and symmetrically spaced apart, forming an arc-extinguishing cavity area for extinguishing the arc. The arc-extinguishing cavity is used to extinguish the arc generated when the moving and stationary contacts break apart. Therefore, the two opposite ends of the arc-extinguishing cavity are the arc inlet for the arc to enter the arc-extinguishing cavity and the arc outlet for the discharge of metal particles. That is, after the arc is generated, it enters the arc-extinguishing cavity through the arc inlet and is extinguished. Arc extinguishing process: Charged metal particles generated during arc extinguishing are discharged from the arc exit port opposite to the arc inlet. The first and second gas-generating hoods generate gas under the high temperature of the arc to propel it towards the arc inlet of the extinguishing chamber. To ensure the gas generated by the first and second gas-generating hoods can quickly propel the arc, the invention sets the first and second gas-generating hoods apart to form a passage zone for the moving contact. After separating from the stationary contact, the moving contact passes through the first and second gas-generating hoods to form... The passage zone allows the electric arc to be generated therein and promptly blown away by the gas generated by the first and second gas generating hoods. Specifically, the passage zone covers the arc inlet and expands towards the arc inlet. This expansion of the passage zone towards the arc inlet accelerates the movement and dispersion of the electric arc towards the diffusion area of ​​the passage zone after it is generated, thereby accelerating the entry of the electric arc into the arc extinguishing chamber. Multiple arc extinguishing grids are stacked in the arc extinguishing chamber, and adjacent arc extinguishing grids are connected to the arc extinguishing wall in a staggered manner at the arc outlet. Specifically, at the arc outlet, the connection structure between adjacent arc extinguishing grids and the arc extinguishing wall is different, and the size of the chamfered area formed between the two sides of adjacent arc extinguishing grids and the arc extinguishing wall is different. This results in different accumulation degrees of metal particles ejected from the arc outlet on adjacent arc extinguishing grids. Since metal particles are difficult to block arc extinguishing grids with different chamfered areas, it is difficult for connected arc extinguishing grids to be filled with metal particles, thus avoiding the failure of the arc extinguishing grids and ensuring the arc extinguishing speed in the arc extinguishing chamber. The arc-extinguishing chamber provided by this invention sets the passage area formed between the first gas-generating hood and the second gas-generating hood as a structure that expands toward the arc inlet, so as to accelerate the movement and dispersion of the electric arc in the passage area toward the arc inlet at the expansion structure, thereby achieving the purpose of the electric arc rapidly entering the arc-extinguishing chamber. At the same time, by staggering the connection and arrangement of adjacent arc-extinguishing grid plates, the metal particles generated during the arc extinguishing process are prevented from blocking the adjacent arc-extinguishing grid plates, thus avoiding the failure of a single arc-extinguishing grid plate, thereby ensuring the arc extinguishing effect and arc extinguishing speed of the arc-extinguishing grid plates. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the arc-extinguishing chamber structure provided in an embodiment of the present invention;

[0024] Figure 2 This is a side sectional view of the arc-extinguishing chamber structure provided in an embodiment of the present invention;

[0025] Figure 3 This is a bottom view of the arc-extinguishing chamber structure provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 2 The right view;

[0027] Figure 5 This is a schematic diagram of the first gas-generating hood structure provided in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the arc-quenching grid structure provided in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of a molded case circuit breaker structure provided in an embodiment of the present invention;

[0030] Wherein, 1 is the arc-extinguishing chamber, 10 is the arc-extinguishing wall, 110 is the arc-extinguishing cavity, 1110 is the arc inlet, 1120 is the arc outlet, 210 is the first gas-generating hood, 220 is the second gas-generating hood, 230 is the passage zone, 30 is the arc-extinguishing grid, 310 is the first arc-extinguishing plate, 320 is the first distance, 330 is the groove, 40 is the moving contact, 410 is the moving silver point, and 50 is the stationary contact. Detailed Implementation

[0031] The core of this invention lies in disclosing an arc-extinguishing chamber to improve the arc-extinguishing speed of the arc-extinguishing chamber.

[0032] Another key aspect of this invention is to provide a molded case circuit breaker that includes the aforementioned arc-extinguishing chamber.

[0033] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete content of the configurations represented in the following embodiments is not limited to those necessary for the solution of the invention as described in the claims.

[0034] like Figure 1-6As shown in the embodiment of the present invention, the arc-extinguishing chamber includes an arc-extinguishing wall 10, a first gas-generating hood 210, a second gas-generating hood 220, and an arc-extinguishing grid 30. Two arc-extinguishing walls 10 are provided and symmetrically spaced apart. Each arc-extinguishing wall 10 is a plate. The two arc-extinguishing walls 10 are arranged opposite each other to form an arc-extinguishing cavity 110 area for extinguishing the arc. The arc-extinguishing cavity 110 is used to extinguish the arc generated when the moving contact and stationary contact break. Therefore, the two opposite ends of the arc-extinguishing cavity 110 are the arc inlets 1110 for the electric arc to enter the arc-extinguishing cavity 110. The arc extinguishing chamber 110 has an arc exit port 1120 for discharging charged gas and charged metal particles. The arc extinguishing chamber 110 works as follows: after the arc is generated, the charged metal particles enter the arc extinguishing chamber 110 through the arc inlet port 1110 and are subjected to arc extinguishing treatment. The charged metal particles generated during the arc extinguishing process are discharged from the arc exit port 1120, which is opposite to the arc inlet port 1110. It should be noted that the two opposite ends of the arc extinguishing chamber 110 here specifically refer to the ends of the two edge planes of the arc extinguishing chamber 110 through which the extension line of the moving contact opening path passes after the moving contact and the stationary contact are separated. The first gas-generating hood 210 and the second gas-generating hood 220 are used to generate gas under the high temperature of the electric arc during arc generation, so as to blow the electric arc toward the arc inlet 1110 of the arc-extinguishing chamber. The gas-generating hood is a commonly used component in the arc-extinguishing chamber and will not be described in detail here. In order to ensure that the gas generated by the first gas-generating hood 210 and the second gas-generating hood 220 can quickly blow the electric arc and accelerate the arc extinguishing action, the arc-extinguishing chamber provided in this embodiment of the invention has the first gas-generating hood 210 and the second gas-generating hood 220 spaced apart to form a passage area 230 for the moving contact to pass through. After the moving contact is separated from the stationary contact, it will pass through the passage area 230 formed by the first gas-generating hood 210 and the second gas-generating hood 220, so that the electric arc generated between the moving contact and the stationary contact is in the passage area 230 and is affected by the first gas-generating hood 210. The gas generated by the gas shroud 210 and the second gas generating shroud 220 acts to blow the arc. In particular, the arc inlet 1110 is located within the passage zone 230, and the structure of the passage zone 230 expands toward the arc inlet 1110. It should be noted that the structural characteristics of the passage zone 230 formed by the first gas generating shroud 210 and the second gas generating shroud 220 can increase the gas flow rate generated by the first gas generating shroud 210 and the second gas generating shroud 220 in the relatively narrow area of ​​the passage zone 230, driving the arc to move quickly. At the same time, after driving the arc through the relatively narrow area of ​​the passage zone 230, it comes into contact with the blowing action of the gas and the diffusion trend of the arc, so that the arc quickly passes through the arc inlet 1110 and enters the arc extinguishing chamber 110 for arc extinguishing, thereby achieving the purpose of accelerating the arc extinguishing.

[0035] Multiple arc-extinguishing grid plates 30 are stacked in the arc-extinguishing cavity 110 to divide and extinguish the electric arc entering the arc-extinguishing cavity 110. Adjacent arc-extinguishing grid plates 30 are staggered in their connection to the arc-extinguishing wall 10 at the arc exit 1120. It should be noted that the two sides of the arc-extinguishing grid plates 30 that contact the arc-extinguishing wall 10 at the arc exit 1120 are typically chamfered to facilitate installation and reduce the accumulation of metal particles. Specifically, the staggered connection of adjacent arc-extinguishing grid plates 30 refers to the chamfered connection at the arc exit 1120... At position 1120, the connection structure between adjacent arc-extinguishing grid plates 30 and arc-extinguishing wall 10 is different, that is, the size of the chamfered area formed between the two sides of adjacent arc-extinguishing grid plates 30 and arc-extinguishing wall 10 is different, so that the metal particles ejected from the arc outlet 1120 accumulate to different degrees on adjacent arc-extinguishing grid plates 30. Since the metal particles are difficult to block the arc-extinguishing grid plates 30 with different chamfered areas, it is difficult for the connected arc-extinguishing grid plates 30 to be filled with metal particles, thus avoiding the failure of the arc-extinguishing grid plates 30 and ensuring the arc-extinguishing speed in the arc-extinguishing cavity 110.

[0036] It should be noted that the existing arc-extinguishing grid plates 30 are arranged in a stacked arrangement with the same structure, and the arc-extinguishing grid plates 30 form a chamfered area with the same structure between the arc outlet 1120 and the arc-extinguishing wall 10. In some arc-extinguishing scenarios, the arc will be ejected from the arc-extinguishing grid plates 30 at the arc outlet 1120. Since the chamfered area structure of adjacent arc-extinguishing grid plates 30 is the same, the arc will be connected in series in the chamfered area of ​​the arc-extinguishing grid plates 30 after being ejected, and will not be cut by the arc-extinguishing grid plates 30. The resistance of the arc cannot increase and it is not easy to extinguish. However, the arc-extinguishing chamber provided in this embodiment of the invention has a staggered connection between adjacent arc-extinguishing grid plates 30. The chamfered areas formed by adjacent arc-extinguishing grid plates 30 on both sides of the arc outlet 1120 and the arc-extinguishing wall 10 are different in size. This allows the arc to be captured by the adjacent arc-extinguishing grid plates 30 and further cut after being ejected from the chamfered area of ​​a single arc-extinguishing grid plate 30, thereby ensuring the arc-extinguishing speed.

[0037] It should be further explained that in the existing arc-extinguishing grid 30, during the arc extinguishing process, metal particles will be uniformly accumulated in the chamfered area of ​​adjacent arc-extinguishing grid 30s. When the accumulation of metal particles between adjacent arc-extinguishing grid 30s reaches the point where the two arc-extinguishing grid 30s are connected, the two arc-extinguishing grid 30s are connected and can only function as one arc-extinguishing grid 30, thereby reducing the number of arc segments cut and slowing down the arc extinguishing speed. However, in the arc-extinguishing chamber provided by the embodiment of the present invention, due to the misaligned connection of adjacent arc-extinguishing grid 30s, the accumulation of metal particles is uneven and it is difficult to connect the two arc-extinguishing grid 30s in the accumulation direction, thereby ensuring the arc extinguishing effect of the arc-extinguishing grid 30.

[0038] The arc-extinguishing chamber provided in this embodiment of the invention features an irregularly shaped passage zone 230 between the first gas-generating hood 210 and the second gas-generating hood 220. The passage zone 230 is designed to expand towards the arc inlet 1110 of the arc-extinguishing chamber 110. This allows the arc located in the passage zone 230 to pass through the arc inlet 1110 and enter the arc-extinguishing chamber more quickly, thanks to the air blowing action of the first and second gas-generating hoods 210 and the tendency of the arc to diffuse towards the expansion area. Simultaneously, by staggering the adjacent arc-extinguishing grid plates 30, the problem of the arc penetrating two adjacent arc-extinguishing grid plates 30 without being cut is avoided during the arc-extinguishing process. This also makes it difficult for metal particles generated during the arc-extinguishing process to clog adjacent arc-extinguishing grid plates 30, preventing the failure of a single arc-extinguishing grid plate 30 and thus ensuring the arc-extinguishing effect and arc-extinguishing speed of the arc-extinguishing grid plates 30.

[0039] Furthermore, in a specific embodiment of the present invention, a first arc-extinguishing plate 310 is provided on one side of the arc-extinguishing cavity 110, that is, on one side of all the arc-extinguishing grid plates 30. The first arc-extinguishing plate 310 and its adjacent arc-extinguishing grid plates 30 are arranged in a non-parallel relationship, and the distance between the first arc-extinguishing plate 310 and its adjacent arc-extinguishing grid plate 30 near the arc outlet 1120 is a first distance 320. The first distance 320 is and only the minimum distance between the first arc-extinguishing plate 310 and its adjacent arc-extinguishing grid plate 30. It should be noted that "near the arc outlet 1120" here refers to the position relative to the arc inlet 1110, that is, one end of the first arc-extinguishing plate 310 is located at the middle position of its adjacent arc-extinguishing grid plate 30. In this embodiment of the present invention, the first arc-extinguishing plate 310 and its adjacent arc-extinguishing grid plate 30 are arranged in a non-parallel relationship. The arc-extinguishing grid 30 is configured to guide the arc tip to penetrate the first arc-extinguishing grid 310 from one side at a first distance 320, thereby entering the arc-extinguishing cavity 110 and the arc-extinguishing grid 30 adjacent to the first arc-extinguishing grid 310, and spreading to other areas. By adjusting the position of the arc-extinguishing grid 30 adjacent to the first arc-extinguishing grid 310, the arc-extinguishing action zone of the adjacent arc-extinguishing grid 30 at the first distance 320 is made. It should be noted that the arc-extinguishing grid 30 is often a slotted structure. The arc-extinguishing action zone refers to the area where there are no slots in the arc path. The arc-extinguishing action zone can effectively divide the arc, thereby ensuring that the arc tip enters the main arc-extinguishing action zone of the arc-extinguishing grid 30, so that the arc can be effectively divided.

[0040] To further accelerate the speed at which the electric arc enters the arc-extinguishing chamber 110, in a specific embodiment of the present invention, after the moving contact separates from the stationary contact, the moving contact opens along the first direction and passes through the passage area 230 formed by the gas-generating hood. The cross-sectional dimension of the first gas-generating hood 210 in the first direction increases from small to large. It should be noted that the cross-sectional dimension is proportional to the gas-generating effect of the gas-generating hood. The cross-sectional dimension of the first gas-generating hood 210 increases from small to large in the first direction, which can generate and concentrate gas in the early stage of the moving contact opening, so as to enhance the blowing effect on the electric arc and accelerate the electric arc entering the arc-extinguishing chamber 110.

[0041] It should be noted that the preferred second gas generating hood 220 also has a cross-sectional dimension that increases from small to large in the first direction, so as to cooperate with the first gas generating hood 210 to enhance the gas generating and gas gathering effects.

[0042] Based on the above embodiments, considering that excessive high-temperature gas production by the gas generating hood may cause certain damage to the structure of the gas generating hood and the arc extinguishing chamber 110, in a specific embodiment of the present invention, the cross-sectional dimension of the first gas generating hood 210 in the first direction increases from small to large and then decreases from large to small. That is, the first gas generating hood 210 is a segmented structure with different cross-sectional dimensions in the first direction, including a segment with a cross-sectional dimension that increases from small to large and a segment with a cross-sectional dimension that decreases from large to small connected together. After the moving contact separates from the stationary contact, it passes through the entire cross-sectional dimension change area of ​​the first gas generating hood 210, so that during the process of the moving contact breaking and opening, the first gas generating hood 210 first strengthens gas production and gathers gas to accelerate the arc movement, and then reduces the amount of gas production to avoid damaging the equipment. At the same time, it plays the role of venting gas in the arc extinguishing chamber 110 and avoids the arc being blown out of the arc extinguishing chamber 110 due to excessive gas production.

[0043] It should be noted that the preferred second gas generating hood 220 also has a cross-sectional dimension that increases from small to large in the first direction, and then decreases from large to small, so as to cooperate with the structure of the first gas generating hood 210.

[0044] Furthermore, in a specific embodiment of the present invention, the first gas generating hood 210 and the second gas generating hood 220 are both disposed on the inner wall of the arc extinguishing cavity 110, and only a portion of the single arc extinguishing grid plate 30 is covered by the first gas generating hood 210 and the second gas generating hood 220, rather than the gas generating hood in the prior art including the entire arc extinguishing grid plate 30 structure. This is to ensure the effect of the first gas generating hood 210 and the second gas generating hood 220 in blowing the electric arc, while the arc extinguishing cavity 110 can be quickly vented because a portion of the arc extinguishing grid plate 30 is not blocked, thus avoiding damage to the arc extinguishing cavity 110 due to the difficulty in releasing high-temperature gas. At the same time, the effective area of ​​the first gas generating hood 210 and the second gas generating hood 220 reduces the blowing effect after the electric arc is blown onto the arc extinguishing grid plate 30, making the effective area of ​​the arc extinguishing grid plate 30 larger, which is conducive to the arc extinguishing grid plate 30 fully cutting the electric arc for arc extinguishing.

[0045] Furthermore, the multiple arc-extinguishing grid plates 30 can be grid plates with different structures to achieve staggered connection between the multiple arc-extinguishing grid plates 30 and the arc-extinguishing wall 10 at the arc outlet 1120. In order to reduce the production cost of the arc-extinguishing grid plates 30, in a specific embodiment of the present invention, the multiple arc-extinguishing grid plates 30 are grid plates of the same structure. The arc-extinguishing grid plates 30 have an asymmetrical structure and adjacent arc-extinguishing grid plates 30 are arranged alternately in the arc-extinguishing cavity 110. It should be noted that the asymmetrical structure of the arc-extinguishing grid plates 30 refers to the different sizes of the chamfers at the two ends of the arc-extinguishing grid plates 30, so that when the arc-extinguishing grid plates 30 are installed alternately in the arc-extinguishing chamber, the connection structure with the arc-extinguishing wall 10 is different due to the different chamfers. And here, the alternate arrangement means that the relationship between adjacent arc-extinguishing grid plates 30 is that they are rotated 180° in a direction perpendicular to the two arc-extinguishing grid plates 30 before installation.

[0046] Furthermore, in a specific embodiment of the present invention, multiple sets of slots are provided on the arc-extinguishing wall 10, and protrusions are provided on multiple arc-extinguishing grid plates 30. The arc-extinguishing grid plates 30 are fixedly connected to the arc-extinguishing wall 10 by snap-fit ​​fixing. Preferably, the arc-extinguishing grid plates 30 are arranged in parallel at equal intervals so that the arc-extinguishing grid plates 30 can uniformly cut the electric arc.

[0047] Furthermore, in a specific embodiment of the present invention, the arc-extinguishing grid plate 30 has a groove 330, which is oriented toward the passage area 230 so that the electric arc in the passage area 230 can more easily enter the arc-extinguishing cavity 110 through the arc inlet 1110 of the groove 330 structure.

[0048] like Figure 7 As shown. This embodiment of the invention also provides a molded case circuit breaker, which includes an arc-extinguishing chamber 1 as provided in any of the above embodiments.

[0049] Furthermore, in the molded case circuit breaker provided in this embodiment of the invention, there are moving contacts 40 and stationary contacts 50. When the moving contact 40 is in the maximum open state after being disconnected from the stationary contact 50, the moving silver point 410 of the moving contact 40 is located within the coverage area of ​​the passage zone 230, so that the electric arc generated between the moving contact 40 and the stationary contact 50 can be covered by the passage zone 230, thereby ensuring the arc-extinguishing chamber 1's driving and arc-extinguishing effect.

[0050] The terms "first," "second," "left side," and "right side," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An arc-extinguishing chamber, characterized in that, include: Symmetrically arranged arc-extinguishing walls (10) surround an arc-extinguishing cavity (110) for extinguishing the arc. The arc-extinguishing cavity (110) includes an inlet (1110) for the electric arc to enter the arc-extinguishing cavity (110) and an outlet (1120) for discharging metal particles. A first gas-generating hood (210) and a second gas-generating hood (220) are used to generate gas under the high temperature of the electric arc to blow the electric arc. The first gas-generating hood (210) and the second gas-generating hood (220) are symmetrically and spaced apart to form a passage area (230) for the moving contact to pass through. The passage area (230) covers the arc inlet (1110) and expands toward the arc inlet (1110). After the moving contact separates from the stationary contact, it passes through the passage area (230) along a first direction. The cross-sectional dimension of the first gas-generating hood (210) in the first direction increases from small to large. Arc-extinguishing grid plates (30), multiple arc-extinguishing grid plates (30) are stacked in the arc-extinguishing cavity (110), and adjacent arc-extinguishing grid plates (30) are staggered with the arc-extinguishing wall (10) at the arc outlet (1120); the staggered connection includes: at the arc outlet (1120), the connection structure between adjacent arc-extinguishing grid plates (30) and the arc-extinguishing wall (10) is different; The arc-extinguishing grid (30) has an asymmetrical structure in the direction perpendicular to the multiple arc-extinguishing grids (30), and the adjacent arc-extinguishing grids (30) are arranged alternately; the asymmetrical structure means that the two ends of the arc-extinguishing grid (30) have different chamfers. The arc-extinguishing grid plate (30) has a groove (330) facing the passage area (230); and the most concave part of the bottom of the groove (330) is biased towards the smaller chamfer of the two ends of the arc-extinguishing grid plate (30).

2. The arc-extinguishing chamber as described in claim 1, characterized in that, The arc-extinguishing cavity (110) has a first arc-extinguishing plate (310) on the side away from the stationary contact. The distance between the first arc-extinguishing plate (310) and the adjacent arc-extinguishing grid plate (30) near the arc outlet (1120) is a first distance (320). The first distance (320) is the minimum distance between the first arc-extinguishing plate (310) and the adjacent arc-extinguishing grid plate (30).

3. The arc-extinguishing chamber as described in claim 1, characterized in that, After the cross-sectional dimension of the first gas generating hood (210) in the first direction increases from small to large and then decreases from large to small, the moving contact passes through the entire cross-sectional dimension change area of ​​the first gas generating hood (210) after separating from the stationary contact.

4. The arc-extinguishing chamber as described in claim 1, characterized in that, The first gas generating hood (210) and the second gas generating hood (220) are disposed on the inner wall of the arc extinguishing chamber (110), and a portion of the arc extinguishing grid plate (30) is wrapped by the first gas generating hood (210) and the second gas generating hood (220).

5. The arc-extinguishing chamber as described in claim 1, characterized in that, Multiple sets of slots are provided on the arc-extinguishing wall (10), and multiple arc-extinguishing grid plates (30) are snapped and fixed on the arc-extinguishing wall (10).

6. A molded case circuit breaker, characterized in that, An arc-extinguishing chamber (1) as described in any one of claims 1-5 is provided.

7. The molded case circuit breaker as described in claim 6, characterized in that, It includes a moving contact (40) and a stationary contact (50). When the moving contact (40) is in the maximum open state, the moving silver point (410) of the moving contact (40) is located within the coverage area of ​​the passage area (230).

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