Arc extinguishing chamber and circuit breaker

Abstract

The utility model discloses an arc extinguishing chamber and a circuit breaker, and relates to the technical field of circuit breakers, the circuit breaker comprises an arc striking angle and an arc striking plate, and the arc extinguishing chamber comprises an insulating part and a grid plate assembly. The insulating part comprises a first partition plate and a second partition plate which are arranged at an interval. The grid plate assembly is arranged between the first partition plate and the second partition plate, the grid plate assembly comprises at least two arc extinguishing grid plates which are arranged at intervals, and the at least two arc extinguishing grid plates comprise a first arc extinguishing grid plate and a second arc extinguishing grid plate. The first arc extinguishing grid sheet comprises a first opening, the first opening faces the arc striking angle and is matched with the arc striking angle, the second arc extinguishing grid sheet comprises a second opening, the second opening faces the arc striking plate and is matched with the arc striking plate, and the second opening faces the arc striking angle and is matched with the arc striking angle. The first opening is larger than the second opening. According to the arc extinguishing chamber and the circuit breaker provided by the invention, the arc extinguishing effect can be improved, and the breaking performance of the circuit breaker can be improved.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, specifically to an arc-extinguishing cover and a circuit breaker. Background Technology

[0002] An arc extinguishing chamber is a device used to accelerate the extinction of an electric arc. Most DC fast circuit breakers are equipped with arc extinguishing chambers. The electric arc generated during the circuit breaker's breaking process can be introduced into the arc extinguishing chamber, allowing the arc to come into contact with a solid medium, reducing the arc's temperature, and thus accelerating the arc's extinction.

[0003] However, due to the lack of proper coordination between the existing arc extinguishing chamber and various components in the circuit breaker, the arc extinguishing effect is poor, which in turn affects the breaking performance of the circuit breaker.

[0004] Therefore, there is an urgent need to propose an arc-extinguishing shield to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this application is to provide an arc-extinguishing cover and a circuit breaker that can improve the arc-extinguishing effect and improve the breaking performance of the circuit breaker.

[0006] In a first aspect, embodiments of this application provide an arc-extinguishing shroud applied to a circuit breaker. The circuit breaker includes an arc-starting angle and an arc-starting plate. The arc-extinguishing shroud includes an insulating component and a grid assembly. The insulating component includes a first partition and a second partition spaced apart. The grid assembly is disposed between the first partition and the second partition, and the grid assembly includes at least two types of arc-extinguishing grids spaced apart, including a first arc-extinguishing grid and a second arc-extinguishing grid. The first arc-extinguishing grid includes a first opening facing the arc-starting angle and adapted to the arc-starting angle. The second arc-extinguishing grid includes a second opening facing the arc-starting plate and adapted to the arc-starting plate. The first opening is larger than the second opening.

[0007] Based on the above embodiments of this application, by setting the grid assembly in the arc extinguishing shroud to two specifications of arc extinguishing grids, wherein the first arc extinguishing grid is adapted to the arc ignition angle and the second arc extinguishing grid is adapted to the arc ignition plate, the tightness of the fit between the arc extinguishing shroud and the arc ignition angle, as well as between the arc extinguishing shroud and the arc ignition plate, can be improved. This helps to reduce the possibility of arc leakage from between the arc ignition angle and the arc extinguishing shroud, and from between the arc ignition plate and the arc extinguishing shroud, thereby improving the arc extinguishing effect of the arc extinguishing shroud, reducing the risk of circuit breaker damage caused by arc diffusion, and the improved arc extinguishing effect helps the circuit breaker maintain stable breaking performance.

[0008] In some examples, the first opening includes a first arc-connecting portion and a first limiting portion, the first limiting portion being located in the middle of the first arc-connecting portion, and the first arc-connecting portion being adapted to the arc-starting angle. The second opening includes a second arc-connecting portion and a second limiting portion, the second limiting portion being located in the middle of the second arc-connecting portion, and the second arc-connecting portion being adapted to the arc-starting plate.

[0009] Based on the embodiments described above, the first arc-receiving portion is configured to receive the electric arc at the arc-starting angle, and the shape of the first arc-receiving portion is adapted to the shape of the arc-starting angle, so that the first opening and the arc-starting angle have a tighter fit, which is more conducive to receiving the electric arc at the arc-starting angle. Similarly, the second arc-receiving portion is configured to receive the electric arc on the arc-starting plate, and the shape of the second arc-receiving portion is adapted to the shape of the arc-starting plate, so that the second opening and the arc-starting plate have a tighter fit, which is more conducive to receiving the electric arc on the arc-starting plate.

[0010] In some examples, the first arc-extinguishing grid also includes a clearance portion, which and the first opening are located on the same side of the first arc-extinguishing grid.

[0011] Based on the above embodiments of this application, by providing an avoidance portion on the same side as the first opening of the first arc-extinguishing grid plate, the portion of the structure located near the arc-starting angle can be avoided. This facilitates the assembly of the arc-extinguishing cover and allows the first arc-extinguishing grid plate to be closer to the arc-starting angle without interference, which is beneficial for the cooperation between the arc-starting angle and the first arc-extinguishing grid plate.

[0012] In some examples, the first partition includes a first pressure relief hole that communicates with the gap between adjacent arc-extinguishing grid plates. And / or, the second partition includes a second pressure relief hole that communicates with the gap between adjacent arc-extinguishing grid plates.

[0013] Based on the embodiments described above, by providing a first pressure relief hole on the first partition plate and connecting the first pressure relief hole with the gap between the adjacent arc-extinguishing grid plate, the expanding gas generated in the grid plate assembly can be discharged through the first pressure relief hole, thereby reducing the gas pressure in the grid plate assembly and preventing damage to the arc-extinguishing cover. Similarly, the second pressure relief hole and the first pressure relief hole can cooperate with each other, allowing the expanding gas to be discharged simultaneously from both the first and second partition plates, further improving the exhaust effect and reducing the risk of damage to the arc-extinguishing cover.

[0014] In some examples, the projection of the first pressure relief hole onto the second partition is spaced apart from that of the second pressure relief hole.

[0015] Based on the above embodiments of this application, the first pressure relief hole and the second pressure relief hole are spaced apart, which can keep the gas discharged from the direction of the first partition plate and the gas discharged from the direction of the second partition plate balanced, reduce the impact of the expanding gas on the first partition plate and the second partition plate, and help maintain the structural stability of the arc extinguishing shroud.

[0016] In some examples, the insulating element also includes a base plate disposed between the first and second partitions, and the base plate is located on the side of the arc-extinguishing shroud away from the arc-starting angle and the arc-starting plate. The base plate includes a third pressure relief hole that communicates with the gap between adjacent arc-extinguishing grid plates.

[0017] Based on the above embodiments of this application, the base plate is disposed between the first partition and the second partition. On the one hand, this can enhance the structural stability of the insulating components and reduce the risk of deformation of the first and second partitions due to external forces. On the other hand, it can reduce the risk of incompletely extinguished arcs spreading out of the arc-extinguishing chamber and improve the arc-extinguishing effect of the arc-extinguishing chamber.

[0018] In some examples, the first partition also includes a first limiting groove and a second limiting groove, which are located on opposite sides of the first partition. The circuit breaker includes a housing, on which a first limiting platform and a second limiting platform are provided. The first limiting platform is adapted to the first limiting groove, and the second limiting platform is adapted to the second limiting groove.

[0019] Based on the above embodiments of this application, the corresponding cooperation between the first limiting groove and the first limiting platform, and the second limiting groove and the second limiting platform, can limit the installation position of the arc extinguishing cover in the circuit breaker housing. This allows the arc extinguishing cover to maintain an appropriate gap with the housing, preventing the insulating parts of the arc extinguishing cover from being tightly attached to the inner wall of the housing and affecting the exhaust of the arc extinguishing cover, thereby indirectly improving the stability of the arc extinguishing cover in use.

[0020] In some examples, the housing also includes a stop located on the side of the first partition away from the second partition, and the stop is capable of abutting against the side of the first partition away from the second partition.

[0021] Based on the above embodiments of this application, the baffle can maintain a distance between the first partition and the cavity wall of the receiving cavity, preventing the first partition from abutting against the cavity wall and causing the first pressure relief hole to be blocked. Similarly, the baffle can also be set on the housing and located on the side of the second partition away from the first partition. This can maintain a distance between the second partition and the cavity wall of the receiving cavity, preventing the second pressure relief hole from being blocked, ensuring that the arc extinguishing hood can exhaust gas in time, and preventing the accumulation of expansion gas in the arc extinguishing hood from causing damage to the arc extinguishing hood.

[0022] In some examples, the housing includes a first vent, a second vent, and a third vent, all of which are connected to the first, second, and third vents.

[0023] Based on the above embodiments of this application, the first exhaust port, the second exhaust port and the third exhaust port are provided to connect the housing assembly cavity of the arc extinguishing shroud with the external environment, ensuring that the expanding gas can be quickly discharged from the circuit breaker after being discharged from the arc extinguishing shroud, reducing the residence time of the expanding gas in the circuit breaker housing, thereby reducing the impact of the expanding gas on the arc extinguishing shroud and the structural stability of the circuit breaker.

[0024] Secondly, embodiments of this application also provide a circuit breaker, including a housing, an arc-starting angle, an arc-starting plate, and the aforementioned arc-extinguishing cover, wherein the arc-starting angle and the arc-starting plate are disposed in the housing, and the arc-extinguishing cover is disposed in the housing and located between the arc-starting angle and the arc-starting plate.

[0025] Based on the embodiments described above, the circuit breaker with the arc-extinguishing cover can improve the arc-extinguishing effect of the circuit breaker and reduce the impact of the arc on the various components of the circuit breaker, thereby improving the breaking performance of the circuit breaker. The arc-extinguishing cover is located between the arc-starting angle and the arc-starting plate, which facilitates the arc to smoothly enter the arc-extinguishing cover during its movement along the arc-starting angle and the arc-starting plate, reducing the possibility of leakage arc and ensuring the stability of the arc-extinguishing effect of the arc-extinguishing cover. Attached Figure Description

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application 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.

[0027] Figure 1 An exploded view of a circuit breaker provided in an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the internal structure of a circuit breaker provided in an embodiment of this application.

[0029] Figure 3 This is a disassembly diagram of the arc-extinguishing cover and circuit breaker housing provided in the embodiments of this application.

[0030] Figure 4 This is a first view of the arc-extinguishing shield provided in an embodiment of this application.

[0031] Figure 5 This is a second view of the arc-extinguishing shield provided in an embodiment of this application.

[0032] Figure 6 This is a third view of the arc-extinguishing shield provided in an embodiment of this application.

[0033] Figure 7 A schematic diagram of the internal structure of the housing provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Circuit breaker; 11. Arc-starting angle; 12. Arc-starting plate; 13. Housing; 131. First limiting platform; 132. Second limiting platform; 133. Stop block; 134. First vent; 135. Second vent; 136. Third vent; 2. Arc-extinguishing chamber; 21. Insulating component; 211. First partition plate; 2111. First pressure relief hole; 2112. First limiting groove; 2113. Second limiting groove; 2114. Protrusion 212. Starting part; 212. Second partition plate; 2121. Second pressure relief hole; 213. Base plate; 2131. Third pressure relief hole; 22. Grid plate assembly; 221. First arc extinguishing grid plate; 2211. First opening; 2212. First arc receiving part; 2213. First limiting part; 2214. Avoidance part; 222. Second arc extinguishing grid plate; 2221. Second opening; 2222. Second arc receiving part; 2223. Second limiting part. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] 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.

[0039] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element 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 application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0040] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] Circuit breakers are prone to generating electric arcs during the breaking process. Since the energy of the electric arc is high, it can damage the circuit breaker. Therefore, it is necessary to install an arc extinguishing chamber in the circuit breaker. The arc extinguishing chamber allows the electric arc to come into contact with the solid medium, reducing the temperature of the electric arc and thus accelerating the extinction of the electric arc.

[0042] However, there are some mismatches between the existing arc extinguishing chamber and the various components in the circuit breaker. For example, the arc extinguishing chamber and the structure used for arc initiation are not properly matched, which can easily lead to the arc not being able to completely enter the arc extinguishing chamber, resulting in poor arc extinguishing effect and thus affecting the breaking performance of the circuit breaker.

[0043] Based on this, the embodiments of this application provide an arc extinguishing cover and a circuit breaker, which can improve the arc extinguishing effect and is beneficial to improving the breaking performance of the circuit breaker.

[0044] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0045] Please refer to Figures 1 to 3 This embodiment provides an arc-extinguishing cover 2, applied to a circuit breaker 1. The circuit breaker 1 includes an arc-starting angle 11 and an arc-starting plate 12. The arc-extinguishing cover 2 includes an insulating component 21 and a grid assembly 22. The insulating component 21 includes a first partition 211 and a second partition 212 spaced apart. The grid assembly 22 is disposed between the first partition 211 and the second partition 212. The grid assembly 22 includes at least two types of arc-extinguishing grids spaced apart, including a first arc-extinguishing grid 221 and a second arc-extinguishing grid 222. The first arc-extinguishing grid 221 includes a first opening 2211 facing the arc-starting angle 11 and adapted to the arc-starting angle 11. The second arc-extinguishing grid 222 includes a second opening 2221 facing the arc-starting plate 12 and adapted to the arc-starting plate 12. The first opening 2211 is larger than the second opening 2221.

[0046] Based on the above embodiments of this application, by setting the grid assembly 22 in the arc extinguishing cover 2 to two specifications of arc extinguishing grids, wherein the first arc extinguishing grid 221 is adapted to the arc ignition angle 11 and the second arc extinguishing grid 222 is adapted to the arc ignition plate 12, the tightness of the fit between the arc extinguishing cover 2 and the arc ignition angle 11 and between the arc extinguishing cover 2 and the arc ignition plate 12 can be improved. This helps to reduce the possibility of arc leakage from between the arc ignition angle 11 and the arc extinguishing cover 2 and from between the arc ignition plate 12 and the arc extinguishing cover 2, thereby improving the arc extinguishing effect of the arc extinguishing cover 2 and reducing the risk of arc propagation causing damage to the circuit breaker 1. The improved arc extinguishing effect is conducive to the circuit breaker 1 maintaining stable breaking performance.

[0047] Reference Figure 2 In circuit breaker 1, the arc-starting angle 11 and the arc-starting plate 12 are usually arranged opposite each other. During the breaking process, the electric arc generated by circuit breaker 1 will enter between the arc-starting angle 11 and the arc-starting plate 12. With the cooperation of the arc-starting angle 11 and the arc-starting plate 12, the electric arc can move between the arc-starting angle 11 and the arc-starting plate 12, and finally move to the end of the arc-starting angle 11 and the end of the arc-starting plate 12.

[0048] The arc extinguishing chamber 2 is positioned near the end of the arc-starting angle 11 and the end of the arc-starting plate 12. The electric arc can move from the end of the arc-starting angle 11 and the end of the arc-starting plate 12 into the arc extinguishing chamber 2, and the arc is quickly extinguished by the grid assembly 22 in the arc extinguishing chamber 2.

[0049] Among them, reference Figure 3 The grid assembly 22 includes at least two types of arc-extinguishing grids spaced apart. In one example, the grid assembly 22 is configured with two types of arc-extinguishing grids, namely a first arc-extinguishing grid 221 and a second arc-extinguishing grid 222.

[0050] Specifically, the first arc-extinguishing grid plate 221 is disposed near the arc-starting angle 11 in the arc-extinguishing cover 2 to receive the electric arc on the arc-starting angle 11. The first opening 2211 is disposed on the side of the first arc-extinguishing grid plate 221 near the arc-starting angle 11, and the opening shape of the first opening 2211 is adapted to the shape of the arc-starting angle 11. This allows the first arc-extinguishing grid plate 221 to fit more closely with the arc-starting angle 11, which is conducive to the smooth movement of the electric arc from the arc-starting angle 11 to the first arc-extinguishing grid plate 221 and reduces the risk of the electric arc leaking out from between the arc-starting angle 11 and the grid plate assembly 22.

[0051] The second arc-extinguishing grid plate 222 is disposed near the arc-extinguishing cover 2 and the arc-starting plate 12. The second arc-extinguishing grid plate 222 is used to receive the electric arc on the arc-starting plate 12. Similarly, the second opening 2221 is disposed on the side of the second arc-extinguishing grid plate 222 near the arc-starting plate 12. The second opening 2221 faces the arc-starting plate 12, and the shape of the opening 2221 is adapted to the shape of the arc-starting plate 12. This allows the second arc-extinguishing grid plate 222 to fit more closely to the arc-starting plate 12, which is conducive to the smooth movement of the electric arc from the arc-starting plate 12 to the second arc-extinguishing grid plate 222 and reduces the risk of the electric arc leaking out between the arc-starting plate 12 and the grid plate assembly 22.

[0052] The second arc-extinguishing grid plate 222, in cooperation with the first arc-extinguishing grid plate 221, enables the arc to move smoothly from between the arc-starting angle 11 and the arc-starting plate 12 into the arc-extinguishing cover 2, which helps to improve the arc-extinguishing effect of the arc-extinguishing cover 2, reduce the risk of arc spread, and thus make the breaking performance of the circuit breaker 1 more stable.

[0053] In one alternative embodiment, the grid assembly 22 may also be composed of three or more arc-extinguishing grids. Multiple arc-extinguishing grids can further expand the applicability of the grid assembly 22 and help improve the arc-extinguishing effect of the grid assembly 22.

[0054] In addition, multiple first arc-extinguishing grid plates 221 can be arranged at intervals, and multiple second arc-extinguishing grid plates 222 can also be arranged at intervals. The multiple first arc-extinguishing grid plates 221 and multiple second arc-extinguishing grid plates 222 are arranged at intervals, which can divide the electric arc into multiple short arcs, which is more conducive to the extinguishing of the electric arc and thus improves the arc-extinguishing effect of the arc-extinguishing cover 2.

[0055] In this embodiment, three first arc-extinguishing grid plates 221 and eight second arc-extinguishing grid plates 222 are provided. The three first arc-extinguishing grid plates 221 and the eight second arc-extinguishing grid plates 222 are stacked and spaced apart from each other. The three first arc-extinguishing grid plates 221 are closer to the arc-starting angle 11 relative to the second arc-extinguishing grid plates 222, so as to adapt to the structure of the arc-starting angle 11.

[0056] Reference Figure 3 The arc extinguishing cover 2 also includes an insulating component 21, which includes a first partition 211 and a second partition 212. The first partition 211 and the second partition 212 are both fixedly connected to the grid assembly 22, and the first partition 211 and the second partition 212 are located on opposite sides of the grid assembly 22, that is, the grid assembly 22 is sandwiched between the first partition 211 and the second partition 212.

[0057] The insulating component 21 serves two purposes: firstly, it is used to fix and install the grid assembly 22, ensuring the structural stability of the grid assembly 22; secondly, it is used to isolate the grid assembly 22. When an electric arc enters the grid assembly 22, it will cause the grid assembly 22 to be subject to high voltage. The insulating component 21 can reduce the damage to other electrical components around the grid assembly 22 caused by the high voltage.

[0058] The connection between the insulating component 21 and the grid assembly 22 can be achieved by riveting or welding. Furthermore, in this embodiment, the insulating component 21 is made of red steel cardboard, which has high insulation properties.

[0059] Further, refer to Figures 1 to 3 This application provides a circuit breaker 1, including a housing 13, an arc-starting angle 11, an arc-starting plate 12, and an arc-extinguishing cover 2. The arc-starting angle 11 and the arc-starting plate 12 are disposed in the housing 13, and the arc-extinguishing cover 2 is disposed in the housing 13 and located between the arc-starting angle 11 and the arc-starting plate 12.

[0060] Based on the embodiments described above, the circuit breaker 1 with the arc-extinguishing cover 2 can improve the arc-extinguishing effect of the circuit breaker 1 and reduce the impact of the arc on the components of the circuit breaker 1, thereby improving the breaking performance of the circuit breaker 1. The arc-extinguishing cover 2 is disposed between the arc-starting angle 11 and the arc-starting plate 12, which facilitates the arc to smoothly enter the arc-extinguishing cover 2 during its movement along the arc-starting angle 11 and the arc-starting plate 12, reducing the possibility of leakage arc and ensuring the stability of the arc-extinguishing effect of the arc-extinguishing cover 2.

[0061] Specifically, the arc-starting angle 11 and the arc-starting plate 12 extend in the same direction within the housing 13, and the arc-extinguishing shroud 2 is positioned between the end of the arc-starting angle 11 and the end of the arc-starting plate 12 so that the arc can smoothly enter the arc-extinguishing shroud 2 as it moves to the end of the arc-starting angle 11 and the end of the arc-starting plate 12.

[0062] In addition, the arc-starting angle 11 and the arc-starting plate 12 continue to extend to the side of the grid assembly 22 away from the first opening 2211 and the second opening 2221. With this arrangement, an arc-extinguishing gap can be formed between the extended portion of the arc-starting angle 11 and the grid assembly 22, and an arc-extinguishing gap can also be formed between the extended portion of the arc-starting plate 12 and the grid assembly 22, thereby improving the arc-extinguishing effect of the arc-extinguishing cover 2.

[0063] Reference Figure 4 In some examples, the first opening 2211 includes a first arc-connecting portion 2212 and a first limiting portion 2213. The first limiting portion 2213 is disposed in the middle of the first arc-connecting portion 2212, and the first arc-connecting portion 2212 is adapted to the arc-starting angle 11. The second opening 2221 includes a second arc-connecting portion 2222 and a second limiting portion 2223. The second limiting portion 2223 is disposed in the middle of the second arc-connecting portion 2222, and the second arc-connecting portion 2222 is adapted to the arc-starting plate 12.

[0064] Based on the above embodiments of this application, the first arc-receiving portion 2212 is provided to receive the electric arc on the arc-starting angle 11, and the shape of the first arc-receiving portion 2212 is adapted to the shape of the arc-starting angle 11, so that the first opening 2211 and the arc-starting angle 11 have a tighter fit, which is more conducive to receiving the electric arc on the arc-starting angle 11. Similarly, the second arc-receiving portion 2222 is provided to receive the electric arc on the arc-starting plate 12, and the shape of the second arc-receiving portion 2222 is adapted to the shape of the arc-starting plate 12, so that the second opening 2221 and the arc-starting plate 12 have a tighter fit, which is more conducive to receiving the electric arc on the arc-starting plate 12.

[0065] In addition, the first limiting part 2213 can limit the electric arc. The first limiting part 2213 is located in the middle of the first arc receiving part 2212. It can concentrate the electric arc received by the first arc receiving part 2212 within the limiting range of the first limiting part 2213. The electric arc is elongated in the first limiting part 2213, which increases the contact area between the electric arc and the arc extinguishing grid, which is conducive to the extinguishing of the electric arc.

[0066] The second limiting part 2223, relative to the second opening 2221, serves the same function and has the same technical effect as the first limiting part 2213 relative to the first opening 2211, and will not be described in detail here. The second limiting part 2223 and the first limiting part 2213 are located on the same longitudinal axis, so they have the same range of arc restriction, which is beneficial for the rapid extinguishing of the arc in the arc extinguishing chamber 2.

[0067] Specifically, the first arc-connecting portion 2212 is located on the side of the first arc-extinguishing grid plate 221 near the arc-starting angle 11. The first arc-connecting portion 2212 is configured as an arc-shaped opening to accommodate a wider arc-starting angle 11, facilitating arc transfer. After the arc-extinguishing cover 2 and the arc-starting angle 11 are assembled, part of the arc-starting angle 11 is located in the arc-shaped opening, so that the arc moving from the arc-starting angle 11 can be transferred from any position of the arc-shaped opening to the grid plate assembly 22.

[0068] Further, refer to Figure 4 The electric arc entering the grid assembly 22 from the arc-shaped opening will gradually concentrate within the restriction range of the first restriction part 2213. On the one hand, it can quickly lengthen the electric arc, which helps to quickly extinguish the electric arc. On the other hand, it can prevent the electric arc from running to other directions and affecting the arc extinguishing effect of the arc extinguishing cover 2 and the safety of use.

[0069] The second arc-connecting portion 2222 is located on the side plate of the second arc-extinguishing grid plate 222 near the arc-starting plate 12. The second arc-connecting portion 2222 is configured with a V-shaped opening to adapt to the structure of the arc-starting plate 12. After the arc-extinguishing cover 2 is assembled with the arc-starting plate 12, the second arc-connecting portion 2222 is opposite to part of the arc-starting plate 12, and the remaining part of the arc-starting plate 12 is parallel to the second arc-extinguishing grid plate 222. This facilitates the transfer of the arc from the arc-starting plate 12 to the arc-extinguishing grid plate, and also facilitates the cooperation between the arc-starting plate 12 and the second arc-extinguishing grid plate 222 to extinguish the arc together.

[0070] Furthermore, the electric arc entering the grid assembly 22 from the V-shaped opening will gradually concentrate within the restriction range of the second restriction part 2223. The second restriction part 2223 and the first restriction part 2213 work together to lengthen the electric arc, which is beneficial for the arc extinguishing cover 2 to achieve rapid arc extinguishing.

[0071] Reference Figure 5 In some examples, the first arc-extinguishing grid 221 also includes a clearance portion 2214, which is located on the same side of the first arc-extinguishing grid 221.

[0072] Based on the above embodiments of this application, by providing an avoidance portion 2214 on the same side as the first opening 2211 of the first arc-extinguishing grid plate 221, the part of the structure located near the arc-starting angle 11 can be avoided. This facilitates the assembly of the arc-extinguishing cover 2 and allows the first arc-extinguishing grid plate 221 to be closer to the arc-starting angle 11 without interference, which is beneficial to the cooperation between the arc-starting angle 11 and the first arc-extinguishing grid plate 221.

[0073] Specifically, the avoidance portion 2214 is provided on both sides of the first arc-connecting portion 2212, which can avoid the partial structure located on both sides of the arc-starting angle 11. Compared with the structure of the second arc-extinguishing grid plate 222, the avoidance portion 2214 provided on the first arc-extinguishing grid plate 221 shortens the length of the first arc-extinguishing grid plate 221, making the first arc-extinguishing grid plate 221 more compatible with the arc-starting angle 11.

[0074] Reference Figure 5 In some examples, the first partition 211 includes a first pressure relief hole 2111, which communicates with the gap between adjacent arc-extinguishing grid plates. In some examples, the second partition 212 includes a second pressure relief hole 2121, which communicates with the gap between adjacent arc-extinguishing grid plates.

[0075] When the electric arc enters the grid assembly 22, it will cause the grid assembly 22 to generate expanding gas. If the gas is not discharged in time, the gas pressure may be too high, causing the arc extinguishing chamber 2 to crack.

[0076] Based on the above embodiments of this application, by providing a first pressure relief hole 2111 on the first partition 211 and connecting the first pressure relief hole 2111 with the gap of the adjacent arc-extinguishing grid plate, the expanding gas generated in the grid plate assembly 22 can be discharged from the first pressure relief hole 2111, thereby reducing the gas pressure in the grid plate assembly 22 and preventing damage to the arc-extinguishing cover 2. Similarly, the second pressure relief hole 2121 and the first pressure relief hole 2111 can cooperate with each other, so that the expanding gas can be discharged simultaneously from both the first partition 211 and the second partition 212, further improving the exhaust effect and reducing the risk of damage to the arc-extinguishing cover 2.

[0077] In this embodiment, the eleven arc-extinguishing grids form a total of ten gaps. Five first pressure relief holes 2111 and five second pressure relief holes 2121 are provided. The five first pressure relief holes 2111 and the five second pressure relief holes 2121 correspond to the ten gaps of the grid assembly 22. In this way, the gas between every two adjacent arc-extinguishing grids can be discharged quickly, which helps to reduce the impact of expanding gas on the structural stability of the arc-extinguishing cover 2.

[0078] The first pressure relief hole 2111 is designed as a rectangular hole, which maximizes the connection range between the first pressure relief hole 2111 and the arc-extinguishing grid plate, thus facilitating gas discharge. The second pressure relief hole 2121 is designed similarly.

[0079] Reference Figure 5 and Figure 6 In some examples, the projection of the first pressure relief hole 2111 on the second partition 212 is spaced apart from the second pressure relief hole 2121.

[0080] Based on the above embodiments of this application, the first pressure relief hole 2111 and the second pressure relief hole 2121 are arranged at intervals, which can keep the gas discharged from the direction of the first partition 211 and the gas discharged from the direction of the second partition 212 balanced, reduce the impact of the expanding gas on the first partition 211 and the second partition 212, and help maintain the structural stability of the arc extinguishing cover 2.

[0081] Specifically, the projections of the five first pressure relief holes 2111 on the second partition 212 are spaced apart from the five second pressure relief holes 2121. This means that the projections of the five first pressure relief holes 2111 are concentrated on the same side of the second partition 212, while the five second pressure relief holes 2121 are concentrated on the other side of the second partition 212.

[0082] Alternatively, in this embodiment, the five first pressure relief holes 2111 and the five second pressure relief holes 2121 can be staggered, that is, one first pressure relief hole 2111 and one second pressure relief hole 2121 are arranged alternately. This arrangement can make the gas discharge process more balanced and further reduce the impact of gas on the arc extinguishing chamber 2.

[0083] In one optional embodiment, ten first pressure relief holes 2111 and ten second pressure relief holes 2121 can be provided simultaneously. This allows for a greater degree of venting, thereby reducing the impact of expanding gas on the structural stability of the arc-extinguishing chamber 2. Of course, the number of first pressure relief holes 2111 and the number of second pressure relief holes 2121 can be set to one or more, as long as the venting requirements are met.

[0084] Reference Figures 4 to 6 In some examples, the insulating element 21 also includes a base plate 213 disposed between the first partition 211 and the second partition 212, and the base plate 213 is located on the side of the arc extinguishing cover 2 away from the arc ignition angle 11 and the arc ignition plate 12. The base plate 213 includes a third pressure relief hole 2131, which communicates with the gap between adjacent arc extinguishing grid plates.

[0085] Based on the above embodiments of this application, the base plate 213 is disposed between the first partition 211 and the second partition 212. On the one hand, this can enhance the structural stability of the insulating component 21 and reduce the risk of deformation of the first partition 211 and the second partition 212 due to external forces. On the other hand, it can reduce the risk of incompletely extinguished arcs spreading out of the arc extinguishing chamber 2 and improve the arc extinguishing effect of the arc extinguishing chamber 2.

[0086] Specifically, the base plate 213 is disposed between the first partition 211 and the second partition 212. The base plate 213, the first partition 211, and the second partition 212 can be connected by various fixed connections, or they can be configured as an integral structure. In this embodiment, the insulating component 21 is an integral structure, which can give the insulating component 21 a certain structural strength and reduce the possibility of deformation of the insulating component 21 under stress.

[0087] Reference Figure 6 The base plate 213 is located on the side of the arc extinguishing shroud 2 away from the arc ignition angle 11 and the arc ignition plate 12. It does not affect the movement of the arc from the arc ignition angle 11 and the arc ignition plate 12 into the arc extinguishing shroud 2. It can also block the arc from spreading out of the grid assembly 22 on the side away from the arc ignition angle 11 and the arc ignition plate 12.

[0088] The third pressure relief hole 2131 opened on the base plate 213, like the first pressure relief hole 2111 and the second pressure relief hole 2121, can serve as a channel for the discharge of expanding gas, so as to reduce the damage to the arc extinguishing chamber 2 caused by the expanding gas in the arc extinguishing chamber 2.

[0089] In this embodiment, ten third pressure relief holes 2131 are provided, and each of the ten pressure relief holes corresponds one-to-one with the ten gaps in the grid assembly 22 to provide a larger exhaust channel. Of course, the number of third pressure relief holes 2131 can also be less than ten, as long as the exhaust requirements are met.

[0090] Reference Figure 5 and Figure 7 In some examples, the first partition 211 further includes a first limiting groove 2112 and a second limiting groove 2113, which are located on opposite sides of the first partition 211. The circuit breaker 1 includes a housing 13, on which a first limiting platform 131 and a second limiting platform 132 are provided. The first limiting platform 131 is adapted to the first limiting groove 2112, and the second limiting platform 132 is adapted to the second limiting groove 2113.

[0091] Based on the above embodiments of this application, the corresponding cooperation between the first limiting groove 2112 and the first limiting platform 131, and the second limiting groove 2113 and the second limiting platform 132, can limit the installation position of the arc extinguishing cover 2 in the circuit breaker 1 housing 13. This allows the arc extinguishing cover 2 to maintain an appropriate gap with the housing 13, preventing the insulating part 21 of the arc extinguishing cover 2 from being too close to the inner wall of the housing 13 and affecting the exhaust of the arc extinguishing cover 2, thereby indirectly improving the stability of the arc extinguishing cover 2 in use.

[0092] The circuit breaker 1 has a housing 13 including a receiving cavity, an arc extinguishing cover 2, an arc ignition angle 11 and an arc ignition plate 12 are all assembled in the receiving cavity, a first limiting platform 131 and a second limiting platform 132 are disposed on the side wall of the receiving cavity and protrude from the side wall of the receiving cavity, and the first limiting platform 131 and the second limiting platform 132 are spaced apart.

[0093] Reference Figure 5 and Figure 7 The first limiting groove 2112 and the second limiting groove 2113 are opened on the two opposite sides of the first partition 211. The arc extinguishing cover 2 is assembled into the housing 13. The first limiting groove 2112 is connected to the first limiting platform 131, and the second limiting groove 2113 is connected to the second limiting platform 132. The two opposite sides of the first partition 211 are both limited, so the arc extinguishing cover 2 can be positioned and installed. This can reduce the possibility of loose assembly of the arc extinguishing cover 2, and can prevent the first pressure relief hole 2111, the second pressure relief hole 2121 and the third pressure relief hole 2131 of the arc extinguishing cover 2 from being blocked, so as to ensure that the arc extinguishing cover 2 can stably extinguish the arc.

[0094] In an optional embodiment, the first limiting groove 2112 and the second limiting groove 2113 can also be provided on the second partition 212, or they can be provided on both the first partition 211 and the second partition 212. Correspondingly, two sets of the first limiting platform 131 and the second limiting platform 132 are also provided, which can further improve the limiting effect on the arc extinguishing cover 2.

[0095] Reference Figures 5 to 7In some examples, the housing 13 also includes a stop 133 located on the side of the first partition 211 opposite to the second partition 212, and the stop 133 is capable of abutting against the side of the first partition 211 opposite to the second partition 212.

[0096] Based on the above embodiments of this application, the baffle 133 can maintain a distance between the first partition 211 and the cavity wall of the receiving cavity, preventing the first pressure relief hole 2111 from being blocked due to the first partition 211 abutting against the cavity wall of the receiving cavity. Similarly, the baffle 133 can also be set on the housing 13 and located on the side of the second partition 212 away from the first partition 211. This can maintain a distance between the second partition 212 and the cavity wall of the receiving cavity, preventing the second pressure relief hole 2121 from being blocked, ensuring that the arc extinguishing shroud 2 can exhaust gas in time, and preventing the expansion gas from accumulating in the arc extinguishing shroud 2 and causing damage to the arc extinguishing shroud 2.

[0097] Specifically, the grid assembly 22 is riveted to the first partition 211 and the second partition 212. Therefore, there is a protrusion 2114 on the side of the first partition 211 away from the second partition 212, and there is also a protrusion 2114 on the side of the second partition 212 away from the first partition 211. The position of the stop block 133 can correspond to these protrusions 2114, that is, the stop block 133 abuts against the protrusions 2114. This can keep the first partition 211 and the second partition 212 with the cavity wall of the receiving cavity to allow gas to flow.

[0098] One or more baffles 133 may be provided. In this embodiment, multiple baffles 133 are spaced apart on the inner wall of the housing 13. The multiple baffles 133 work together to limit the distance between the arc extinguishing cover 2 and the cavity wall, which can improve the assembly stability of the arc extinguishing cover 2 and prevent one of the first pressure relief holes 2111 or one of the second pressure relief holes 2121 from being blocked, ensuring that the arc extinguishing cover 2 can exhaust smoothly.

[0099] Reference Figure 7 In some examples, the housing 13 includes a first vent 134, a second vent 135, and a third vent 136, and the first pressure relief hole 2111, the second pressure relief hole 2121, and the third pressure relief hole 2131 are all connected to the first vent 134, the second vent 135, and the third vent 136.

[0100] Based on the above embodiments of this application, the first exhaust port 134, the second exhaust port 135 and the third exhaust port 136 are provided to connect the housing 13 to the receiving cavity of the arc-extinguishing cover 2 and the external environment, so as to ensure that the expanding gas can be quickly discharged from the circuit breaker 1 after being discharged from the arc-extinguishing cover 2, thereby reducing the time that the expanding gas stays in the housing 13 of the circuit breaker 1, and thus reducing the impact of the expanding gas on the arc-extinguishing cover 2 and the structural stability of the circuit breaker 1.

[0101] Specifically, the first exhaust port 134, the second exhaust port 135, and the third exhaust port 136 are spaced apart at different positions on the housing 13. They can be on the side wall of the housing 13 or on the bottom wall of the housing 13. The first exhaust port 134, the second exhaust port 135, and the third exhaust port 136 are all connected to the receiving cavity for installing the arc extinguishing shroud 2 and the external environment. After the expanding gas is discharged from the first pressure relief hole 2111, the second pressure relief hole 2121, and the third pressure relief hole 2131 on the arc extinguishing shroud 2, it can be discharged from the receiving cavity in a timely manner, avoiding the expansion gas from staying in the housing 13 and affecting the further exhaust of the arc extinguishing shroud 2, thus ensuring that the arc extinguishing shroud 2 can stably extinguish the arc.

[0102] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An arc-extinguishing cover, characterized in that, Applied to a circuit breaker, the circuit breaker includes an arc-starting angle and an arc-starting plate, and the arc-extinguishing shroud includes: An insulating component, comprising a first partition and a second partition spaced apart from each other; A grid assembly is disposed between the first partition and the second partition. The grid assembly includes at least two types of arc-extinguishing grids arranged at intervals, including a first arc-extinguishing grid and a second arc-extinguishing grid. The first arc-extinguishing grid includes a first opening facing the arc-initiating angle and adapted to the arc-initiating angle. The second arc-extinguishing grid includes a second opening facing the arc-initiating plate and adapted to the arc-initiating plate. The first opening is larger than the second opening.

2. The arc-extinguishing cover according to claim 1, characterized in that, The first opening includes a first arc-connecting portion and a first limiting portion. The first limiting portion is disposed in the middle of the first arc-connecting portion, and the first arc-connecting portion is adapted to the arc-drawing angle. The second opening includes a second arc-connecting portion and a second limiting portion. The second limiting portion is disposed in the middle of the second arc-connecting portion, and the second arc-connecting portion is adapted to the arc-initiating plate.

3. The arc-extinguishing cover according to claim 1, characterized in that, The first arc-extinguishing grid also includes a clearance portion, which is located on the same side of the first arc-extinguishing grid as the first opening.

4. The arc-extinguishing cover according to any one of claims 1-3, characterized in that, The first partition includes a first pressure relief hole, which is connected to the gap between the adjacent arc-extinguishing grid plate; And / or, the second partition includes a second pressure relief hole, which communicates with the gap between adjacent arc-extinguishing grid plates.

5. The arc-extinguishing cover according to claim 4, characterized in that, The projection of the first pressure relief hole onto the second partition plate is spaced apart from the second pressure relief hole.

6. The arc-extinguishing cover according to claim 4, characterized in that, The insulating component further includes a base plate disposed between the first partition and the second partition, and the base plate is located on the side of the arc-extinguishing cover away from the arc-initiating angle and the arc-initiating plate. The base plate includes a third pressure relief hole, which is connected to the gap between adjacent arc-extinguishing grid plates.

7. The arc-extinguishing cover according to claim 6, characterized in that, The first partition also includes a first limiting groove and a second limiting groove, which are located on two opposite sides of the first partition. The circuit breaker includes a housing, on which a first limiting platform and a second limiting platform are provided. The first limiting platform is adapted to the first limiting groove, and the second limiting platform is adapted to the second limiting groove.

8. The arc-extinguishing cover according to claim 7, characterized in that, The housing also includes a stop block located on the side of the first partition away from the second partition, and the stop block is capable of abutting against the side of the first partition away from the second partition.

9. The arc-extinguishing cover according to claim 7, characterized in that, The housing includes a first exhaust port, a second exhaust port, and a third exhaust port, and the first pressure relief hole, the second pressure relief hole, and the third pressure relief hole are all connected to the first exhaust port, the second exhaust port, and the third exhaust port.

10. A circuit breaker, characterized in that, The device includes a housing, an arc-starting angle, an arc-starting plate, and an arc-extinguishing cover as described in any one of claims 1-9, wherein the arc-starting angle and the arc-starting plate are disposed in the housing, and the arc-extinguishing cover is disposed in the housing and located between the arc-starting angle and the arc-starting plate.

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