Contact arc extinguishing system and circuit breaker

Abstract

The utility model discloses a contact arc extinguishing system and a circuit breaker, and relates to the technical field of low-voltage electrical appliances, the contact arc extinguishing system is applied to a switching device, the switching device comprises a shell, the shell is provided with a mounting cavity, the contact arc extinguishing system is arranged in the mounting cavity, and the contact arc extinguishing system comprises a contact supporting assembly and an arc extinguishing assembly. The contact support assembly comprises a contact support and a support seat, the contact support is arranged on the support seat, and the contact support is used for supporting a moving contact. The arc extinguishing assembly comprises an arc isolating cover and a plurality of arc extinguishing grid sheets, and the plurality of arc extinguishing grid sheets are arranged on the arc isolating cover at intervals. And one side, far away from the arc isolating cover, of each arc extinguishing grid sheet is fixedly connected with the supporting seat to form an independent module. According to the contact arc extinguishing system and the circuit breaker provided by the invention, the matching stability and the arc extinguishing capability of the contact arc extinguishing system can be improved.

Description

Technical Field

[0001] This application relates to the technical field of low-voltage electrical appliances, and particularly relates to a contact arc extinguishing system and a circuit breaker. Background Art

[0002] In low-voltage switchgear, a contact assembly is used to achieve the functions of conduction and disconnection. An arc extinguishing assembly is usually arranged close to the contact assembly, and the arc extinguishing assembly can play a role in guiding and extinguishing the arc generated in the contact assembly.

[0003] In the prior art, both the arc extinguishing assembly and the contact assembly are fixedly installed in the housing of the low-voltage switchgear. When the contact assembly is disconnected, the arc generated in the contact assembly will move towards the arc extinguishing assembly and enter the arc extinguishing assembly to extinguish the arc through the arc extinguishing assembly.

[0004] However, the arc extinguishing assembly and the contact assembly in the housing are prone to affect the cooperation stability between the two due to installation position deviation or unstable installation, resulting in a decrease in the arc extinguishing ability. Summary of the Utility Model

[0005] The purpose of this application is to provide a contact arc extinguishing system and a circuit breaker, which can improve the cooperation stability and arc extinguishing ability of the contact arc extinguishing system.

[0006] In a first aspect, an embodiment of this application provides a contact arc extinguishing system, which is applied to a switching device. The switching device includes a housing, the housing has an installation cavity, the contact arc extinguishing system is arranged in the installation cavity, and the contact arc extinguishing system includes a contact support assembly and an arc extinguishing assembly. The contact support assembly includes a contact support and a support seat, the contact support is arranged on the support seat, and the contact support is used to support a moving contact. The arc extinguishing assembly includes an arc isolation cover and a plurality of arc extinguishing grids, and the plurality of arc extinguishing grids are arranged at intervals on the arc isolation cover. One side of the plurality of arc extinguishing grids away from the arc isolation cover is fixedly connected to the support seat and forms an independent module.

[0007] Based on the above embodiment of this application, by fixedly connecting the arc extinguishing assembly and the contact support assembly together, the positions of the arc extinguishing assembly and the contact support assembly can always be kept relatively fixed, which is beneficial to improving the cooperation stability between the arc extinguishing assembly and the contact support assembly.

[0008] Moreover, the arc extinguishing assembly is fixedly connected to the support seat of the contact support assembly through the arc extinguishing grids, which can shorten the distance between the arc extinguishing grids and the moving contact located in the support seat, and is beneficial to the arc generated at the moving contact to accurately and quickly enter the arc extinguishing grids, improving the arc extinguishing effect of the arc extinguishing assembly in the installation cavity.

[0009] In some examples, the support base includes a bottom plate, and a first support plate and a second support plate that are spaced apart and disposed on the bottom plate. The contact support is disposed between the first support plate and the second support plate. One side of the arc extinguishing grid plate away from the arc isolation cover has an opening, and the opening faces the space between the first support plate and the second support plate.

[0010] Based on the above embodiments of the present application, by disposing the contact support between the first support plate and the second support plate, the moving contact on the contact support is also located between the first support plate and the second support plate, so that the arcs generated after the moving contact is separated from the static contact of the switching device are all in the space between the first support plate and the second support plate, and the opening of the arc extinguishing grid plate faces the space between the first support plate and the second support plate, which is beneficial to the smooth entry of the arc into the arc extinguishing assembly and improves the arc extinguishing effect of the arc extinguishing assembly.

[0011] In some examples, a first clamping portion is disposed on the first support plate, a second clamping portion is disposed on the second support plate, a first clamping arm and a second clamping arm are disposed on one side of the arc extinguishing grid plate away from the arc isolation cover, and the first clamping arm and the second clamping arm are spaced apart to form an opening. The first clamping arm is clamped to the first clamping portion, and the second clamping arm is clamped to the second clamping portion.

[0012] Based on the above embodiments of the present application, by providing the first clamping arm and the second clamping arm on one side of the arc extinguishing grid plate away from the arc isolation cover, an opening can be formed to correspondingly face the space between the first support plate and the second support plate, facilitating the entry of the arc into the arc extinguishing assembly. It can also be fixedly connected to the first clamping portion and the second clamping portion, which is beneficial to improving the cooperation stability between the arc extinguishing assembly and the contact support assembly and further ensuring that the arc completely enters the arc extinguishing assembly. This setting form has the characteristics of simple structure, convenient production and manufacturing, and convenient assembly, and has high practicability.

[0013] In some examples, the first clamping portion is disposed on the side of the first support plate facing away from the second support plate, and the second clamping portion is disposed on the side of the second support plate facing away from the first support plate.

[0014] The advantage of this setting method is that both the first support plate and the second support plate are stuck in the opening of the arc extinguishing grid plate, and the arc can completely enter the arc extinguishing assembly after diffusing from the space between the first support plate and the second support plate, effectively reducing the possibility of the arc diffusing out between the contact support assembly and the arc extinguishing assembly. Moreover, the arc extinguishing grid plate is relatively convenient to be clamped from the outside of the support base, which can improve the installation efficiency and is also convenient for disassembly when maintenance or replacement of the arc extinguishing assembly is required.

[0015] In an alternative embodiment, the first clamping portion is disposed on the side of the first support plate close to the second support plate, and the second clamping portion is disposed on the side of the second support plate close to the first support plate.

[0016] The advantage of this setting method is that the position of the snap connection is inside the support base, which can make the connection between the arc extinguishing grid and the support base tighter and more stable, reducing looseness caused by factors such as vibration during the operation of the switching device. At the same time, this design can also save space to a certain extent, making the overall structure of the contact arc extinguishing system more compact.

[0017] In some examples, the first snap connection part is set as the first snap connection groove, the second snap connection part is set as the second snap connection groove, the first snap connection arm is provided with a first snap connection protrusion, the second snap connection arm is provided with a second snap connection protrusion, the first snap connection groove is correspondingly snapped with the first snap connection protrusion, and the second snap connection groove is correspondingly snapped with the second snap connection protrusion.

[0018] Based on the above embodiments of the present application, the setting forms of the first snap connection groove and the second snap connection groove have the characteristics of simple structure and easy processing and forming. At the same time, the first snap connection protrusion and the second snap connection protrusion also have the characteristics of simple structure and easy manufacturing. Moreover, the cooperation form of the snap connection groove and the snap connection protrusion is simple and reliable, which is beneficial to improving the assembly stability and assembly efficiency.

[0019] In some examples, both the first snap connection groove and the second snap connection groove are opened in a direction perpendicular to the bottom plate, and multiple arc extinguishing grids are parallel to the bottom plate and snapped into the first snap connection groove and the second snap connection groove.

[0020] Based on the above embodiments of the present application, the first snap connection groove and the second snap connection groove are both opened in a direction perpendicular to the bottom plate, which can correspond to multiple arc extinguishing grids in the arc extinguishing assembly, so that each arc extinguishing grid can be snapped onto the snap connection groove through the first snap connection protrusion and the second snap connection protrusion.

[0021] In some examples, both the first snap connection groove and the second snap connection groove are set as arc-shaped grooves, and both the first snap connection protrusion and the second snap connection protrusion are set as arc-shaped protrusions adapted to the arc-shaped grooves.

[0022] Based on the above embodiments of the present application, the cooperation form of the arc-shaped groove and the arc-shaped protrusion can realize the stable connection between the arc extinguishing assembly and the contact support assembly, prevent the separation of the arc extinguishing assembly and the contact support assembly under the action of external force, and is beneficial to improving the cooperation stability between the arc extinguishing assembly and the contact support assembly. At the same time, this cooperation form also has the characteristics of simple structure, easy processing, easy disassembly and assembly, and high practicability.

[0023] In some examples, there are two sets of arc extinguishing assemblies, and the two sets of arc extinguishing assemblies are oppositely arranged on both sides of the support base.

[0024] Based on the above embodiments of the present application, the two sets of arc extinguishing assemblies can correspond to two moving contacts provided in the contact support assembly. The two sets of arc extinguishing assemblies are oppositely arranged on both sides of the support base, and can extinguish the arcs generated on different moving contacts from different directions to further improve the arc extinguishing effect.

[0025] In some examples, the contact arc extinguishing system further includes an arc baffle plate connected to a side of the support base away from the contact support, and the arc baffle plate extends to a side of the arc extinguishing assembly close to a plane where the base plate is located.

[0026] Based on the above-mentioned embodiments of the present application, the arc baffle can block the arc and prevent the arc from spreading out from the bottom of the arc extinguishing assembly, which is beneficial to improving the arc extinguishing effect of the arc extinguishing assembly and reducing the risks caused by arc diffusion.

[0027] In the second aspect, an embodiment of the present application also provides a circuit breaker, including a shell, a stationary contact plate and the above-mentioned contact arc extinguishing system, the shell has an installation cavity, the contact arc extinguishing system is arranged in the installation cavity, the stationary contact plate is arranged on the shell and extends into the installation cavity, and the moving contact can contact or separate with the stationary contact plate as the contact support moves.

[0028] Based on the above-mentioned embodiments of the present application, the circuit breaker with the above-mentioned contact arc extinguishing system effectively improves the coordination stability of the contact support assembly and the arc extinguishing assembly by fixedly connecting the contact support assembly and the arc extinguishing assembly, thereby improving the arc extinguishing effect of the arc extinguishing assembly, reducing the impact of the arc on other components in the circuit breaker, and improving the safety of the circuit breaker. At the same time, the contact arc extinguishing system forms an independent module, which can keep the position of the contact support assembly and the arc extinguishing assembly relatively fixed at all times, thereby improving the assembly accuracy. It is also convenient to assemble the entire assembly into the housing of the circuit breaker, thereby improving the overall assembly efficiency of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a portion of the structure of a switch device provided in an embodiment of the present application.

[0031] Figure 2 An exploded view of a portion of the structure of a switch device provided in an embodiment of the present application.

[0032] Figure 3 This is a first perspective diagram of the structure of the contact arc extinguishing system provided in an embodiment of the present application.

[0033] Figure 4 A second perspective of the structural schematic diagram of the contact arc extinguishing system provided in an embodiment of the present application.

[0034] Figure 5This is the first perspective of the structural schematic diagram of the contact support assembly provided by the embodiment of the present application.

[0035] Figure 6 This is the first perspective of the structural schematic diagram of the contact support assembly provided by the embodiment of the present application.

[0036] Figure 7 This is the structural schematic diagram of the arc extinguishing assembly provided by the embodiment of the present application.

[0037] Figure 8 This is the partial structural schematic diagram of the circuit breaker provided by the embodiment of the present application.

[0038] Explanation of reference numerals:

[0039] 100, switching device; 200, contact arc extinguishing system; 1, housing; 11, installation cavity; 12, static contact plate; 2, contact support assembly; 21, contact support; 22, support seat; 221, bottom plate; 222, first support plate; 2221, first clamping portion; 2222, first accommodating groove; 223, second support plate; 2231, second clamping portion; 2232, second accommodating groove; 3, arc extinguishing assembly; 31, arc isolation cover; 32, arc extinguishing grid; 321, opening; 322, first clamping arm; 3221, first clamping protrusion; 323, second clamping arm; 3231, second clamping protrusion; 4, arc baffle. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0042] It should be noted that: like reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the system or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0044] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] Low-voltage switchgear usually includes an operating mechanism, a tripping mechanism, a contact assembly, an arc extinguishing assembly, etc. The moving contact in the contact assembly can move under the action of the operating mechanism and the tripping mechanism, so as to contact or separate from the static contact in the contact assembly. When the moving contact separates from the static contact, the current path is disconnected, and an arc is generated between the moving contact and the static contact. The arc will enter the arc extinguishing assembly arranged close to the contact assembly, and the arc is extinguished through the arc extinguishing assembly to ensure the safety of the low-voltage switchgear.

[0046] However, in the prior art, both the contact assembly and the arc extinguishing assembly are separately assembled in the housing of the low-voltage switchgear. The positions between the contact assembly and the arc extinguishing assembly are relatively unfixed, and it is easy to have a relative deviation in the installation positions of the contact assembly and the arc extinguishing assembly, or the installation is unstable, which affects the cooperation stability of the contact assembly and the arc extinguishing assembly and results in a reduction in the arc extinguishing ability.

[0047] Based on this, the embodiments of the present application provide a contact arc extinguishing system and a circuit breaker, which can improve the cooperation stability and arc extinguishing ability of the contact arc extinguishing system.

[0048] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0049] Refer to Figures 1 to 3, this embodiment provides a contact arc extinguishing system 200, which is applied to a switching device 100. The switching device 100 includes a housing 1. The housing 1 has an installation cavity 11. The contact arc extinguishing system 200 is arranged in the installation cavity 11. The contact arc extinguishing system 200 includes a contact support assembly 2 and an arc extinguishing assembly 3. The contact support assembly 2 includes a contact support 21 and a support base 22. The contact support 21 is arranged on the support base 22. The contact support 21 is used to support a moving contact. The arc extinguishing assembly 3 includes an arc isolation cover 31 and a plurality of arc extinguishing grid plates 32. The plurality of arc extinguishing grid plates 32 are arranged on the arc isolation cover 31 at intervals. One side of the plurality of arc extinguishing grid plates 32 away from the arc isolation cover 31 is fixedly connected to the support base 22 and forms an independent module.

[0050] Based on the above embodiments of the present application, by fixedly connecting the arc extinguishing assembly 3 and the contact support assembly 2 together, the positions of the arc extinguishing assembly 3 and the contact support assembly 2 can be kept relatively fixed all the time, which is beneficial to improving the cooperation stability between the arc extinguishing assembly 3 and the contact support assembly 2.

[0051] Moreover, the arc extinguishing assembly 3 is fixedly connected to the support base 22 of the contact support assembly 2 through the arc extinguishing grid plates 32, which can shorten the distance between the arc extinguishing grid plates 32 and the moving contact located in the support base 22, and is beneficial to the arc generated at the moving contact entering the arc extinguishing grid plates 32 accurately and quickly, thereby improving the arc extinguishing effect of the arc extinguishing assembly 3 in the installation cavity 11.

[0052] Specifically, referring to Figure 2 , the housing 1 serves as the installation basis of the contact arc extinguishing system 200, which can ensure the installation stability and safety of the contact arc extinguishing system 200. The installation cavity 11 on the housing 1 is used to accommodate the contact arc extinguishing system 200. After the switching device 100 is assembled, the installation cavity 11 can form a closed space. The contact arc extinguishing system 200 is installed in the installation cavity 11. The installation cavity 11 can play a role in preventing the diffusion of the arc, which is beneficial to improving the safety of the switching device 100.

[0053] The contact support assembly 2 is used to support the moving contact. The moving contact is usually arranged on the contact support 21. The contact support 21 is arranged on the support base 22. The contact support 21 can move relative to the support base 22 to drive the moving contact to move, so that the moving contact can contact or separate from the static contact in the switching device 100.

[0054] The support base 22 is used to carry the contact support 21 and the moving contact, which can ensure the stable operation of the contact support 21 and the moving contact, and is convenient for realizing the assembly between the contact support assembly 2 and the installation cavity 11.

[0055] Referring to Figure 2, the arc extinguishing cover 31 in the arc extinguishing component 3 can not only fixedly install the arc extinguishing grids 32, but also block the diffusion of the arc from the arc extinguishing grids 32, which can reduce the risk brought by the arc diffusion and improve the arc extinguishing ability of the arc extinguishing component 3.

[0056] The multiple arc extinguishing grids 32 arranged at intervals are used to separate the generated arc into shorter arcs so that the arc can be quickly extinguished. The side of the arc extinguishing grids 32 away from the arc extinguishing cover 31 is fixedly connected to the support base 22, which is convenient for the arc to accurately and quickly enter the arc extinguishing grids 32 from the support base 22, avoiding the arc diffusion caused by the gap due to the assembly error between the arc extinguishing component 3 and the contact support component 2, and effectively improving the arc extinguishing effect.

[0057] Furthermore, referring to Figure 3 , the contact support component 2 is fixedly connected to the arc extinguishing component 3, which can make the contact support component 2 and the arc extinguishing component 3 form an independent module. On the one hand, it can keep the positions of the contact support component 2 and the arc extinguishing component 3 relatively fixed, which is beneficial to improving the cooperation stability between the contact support component 2 and the arc extinguishing component 3, avoiding the situation that the arc cannot completely enter the arc extinguishing component 3 due to the relative position deviation, and reducing the risk of arc diffusion.

[0058] On the other hand, it is convenient to be assembled into the installation cavity 11. For example, the contact support component 2 and the arc extinguishing component 3 can be assembled into the installation cavity 11 at the same time, simplifying the assembly structure and assembly operation. Or when the installation cavity 11 is relatively deep, using the contact support component 2 and the arc extinguishing component 3 as an independent module for assembly is beneficial to improving the accuracy of positioning and installation.

[0059] It should be noted that the contact arc extinguishing system 200 provided by the embodiment of the present application can be applied to various switching devices 100, such as circuit breakers, contactors, and fuses.

[0060] Referring to Figure 3 and Figure 4 , in some examples, the support base 22 includes a bottom plate 221, and a first support plate 222 and a second support plate 223 arranged at intervals on the bottom plate 221, and the contact support 21 is arranged between the first support plate 222 and the second support plate 223. The side of the arc extinguishing grids 32 away from the arc extinguishing cover 31 has an opening 321, and the opening 321 faces the space between the first support plate 222 and the second support plate 223.

[0061] Based on the above embodiments of the present application, by arranging the contact support 21 between the first support plate 222 and the second support plate 223, the moving contact on the contact support 21 is also located between the first support plate 222 and the second support plate 223, so that the arcs generated after the moving contact is separated from the static contact of the switching device 100 are all in the space between the first support plate 222 and the second support plate 223. The opening 321 of the arc extinguishing grid 32 faces the space between the first support plate 222 and the second support plate 223, which is beneficial to the smooth entry of the arc into the arc extinguishing assembly 3 and improves the arc extinguishing effect of the arc extinguishing assembly 3.

[0062] Specifically, referring to Figure 3 , the first support plate 222 and the second support plate 223 are spaced apart and arranged on the same side of the bottom plate 221. The first support plate 222 and the second support plate 223 are both perpendicular to the bottom plate 221. The first support plate 222, the second support plate 223 and the bottom plate 221 jointly enclose an installation space, and the contact support 21 is installed in this installation space. Further, the contact support 21 is movably connected to the first support plate 222 and the second support plate 223. The contact support 21 can move in a direction perpendicular to the bottom plate 221 to drive the moving contact to move in a direction perpendicular to the bottom plate 221. Arcs may be generated during the movement of the moving contact and its separation from the static contact, and the generated arcs are in the aforementioned installation space, which can prevent some arcs from spreading into the installation cavity 11.

[0063] Referring to Figure 3 , the side of the arc extinguishing grid 32 away from the arc isolation cover 31 is fixedly connected to the support seat 22, and the opening 321 of the arc extinguishing grid 32 is also on the side away from the arc isolation cover 31. The setting of the opening 321 can correspond to the space between the first support plate 222 and the second support plate 223, so that the arc can move from the space between the first support plate 222 and the second support plate 223 into the arc extinguishing assembly 3.

[0064] Among them, a plurality of arc extinguishing grids 32 in the arc extinguishing assembly 3 are spaced apart. The plurality of arc extinguishing grids 32 are parallel to the bottom plate 221 of the support seat 22, and the plurality of arc extinguishing grids 32 are stacked in a direction perpendicular to the bottom plate 221. An opening 321 is provided on the side of each arc extinguishing grid 32 away from the arc isolation cover 31, and the opening 321 of each arc extinguishing grid 32 faces the space between the first support plate 222 and the second support plate 223. In this way, the arc extinguishing assembly 3 can completely correspond to the space between the first support plate 222 and the second support plate 223, effectively reducing the risk of arc diffusion and improving the arc extinguishing effect of the arc extinguishing assembly 3.

[0065] Referring to Figures 5 to 7, in some examples, a first clamping portion 2221 is provided on the first support plate 222, a second clamping portion 2231 is provided on the second support plate 223, a first clamping arm 322 and a second clamping arm 323 are provided on the side of the arc extinguishing grid piece 32 away from the arc separating cover 31, and the first clamping arm 322 and the second clamping arm 323 are arranged at intervals to form an opening 321. The first clamping arm 322 is clamped to the first clamping portion 2221, and the second clamping arm 323 is clamped to the second clamping portion 2231.

[0066] Based on the above embodiments of the present application, by providing the first clamping arm 322 and the second clamping arm 323 on the side of the arc extinguishing grid piece 32 away from the arc separating cover 31, an opening 321 can be formed to correspondingly face the space between the first support plate 222 and the second support plate 223, facilitating the entry of the arc into the arc extinguishing assembly 3. It can also be fixedly connected to the first clamping portion 2221 and the second clamping portion 2231, which is beneficial to improving the cooperation stability between the arc extinguishing assembly 3 and the contact support assembly 2, and further ensuring that the arc completely enters the arc extinguishing assembly 3. This setting form has the characteristics of simple structure, convenient production and manufacturing, and convenient assembly, and has high practicability.

[0067] For the specific forms of the first clamping portion 2221 and the second clamping portion 2231, they can be groove or protrusion structures respectively provided on the first support plate 222 and the second support plate 223. For example, the first clamping portion 2221 can be a rectangular groove that can closely cooperate with the first clamping arm 322 of the arc extinguishing grid piece 32. Similarly, the second clamping portion 2231 can be a protrusion with a specific shape to achieve clamping with the second clamping arm 323 of the arc extinguishing grid piece 32.

[0068] The first clamping arm 322 and the second clamping arm 323 on the arc extinguishing grid piece 32 are arranged at intervals, and their shapes and sizes can match the first clamping portion 2221 and the second clamping portion 2231. For example, the first clamping arm 322 can be a long strip-shaped structure with a certain elasticity, and its end can be designed in a hook shape so as to be firmly clamped in the groove of the first clamping portion 2221. The second clamping arm 323 can be a structure with a bent part that can be closely clamped on the second clamping portion 2231 of the second support plate 223.

[0069] During the actual installation process, the operator can first align the first clamping arm 322 of the arc extinguishing grid piece 32 with the first clamping portion 2221 on the first support plate 222, and then gently push the first clamping arm 322 into the first clamping portion 2221 with a little force to firmly clamp them together. Then, align the second clamping arm 323 of the arc extinguishing grid piece 32 with the second clamping portion 2231 on the second support plate 223, and also gently push the second clamping arm 323 into the second clamping portion 2231 with a little force to complete the clamping installation of the arc extinguishing grid piece 32 and the support base 22. This clamping method is not only convenient and fast for installation, but also can ensure that the arc extinguishing grid piece 32 will not loosen or fall off during the operation of the switching device 100, guaranteeing the stability and reliability of the contact arc extinguishing system 200.

[0070] In the embodiment of the present application, referring to Figure 5 and Figure 6 , the first clamping portion 2221 is arranged on the side of the first support plate 222 facing away from the second support plate 223, and the second clamping portion 2231 is arranged on the side of the second support plate 223 facing away from the first support plate 222.

[0071] In this setting method, the first clamping arm 322 of the arc extinguishing grid piece 32 needs to perform the clamping operation from the direction of the first support plate 222 facing away from the second support plate 223, so that the first clamping arm 322 is located on the side of the first support plate 222 facing away from the second support plate 223. Similarly, the second clamping arm 323 needs to perform the clamping operation from the direction of the second support plate 223 facing away from the first support plate 222, so that the second clamping arm 323 is located on the side of the second support plate 223 facing away from the first support plate 222.

[0072] The advantage of this setting method is that both the first support plate 222 and the second support plate 223 are clamped within the opening 321 of the arc extinguishing grid piece 32. After the arc diffuses from the space between the first support plate 222 and the second support plate 223, it can completely enter the arc extinguishing component 3, effectively reducing the possibility of the arc diffusing out between the contact support component 2 and the arc extinguishing component 3. Moreover, it is relatively convenient to perform the clamping operation of the arc extinguishing grid piece 32 from the outside of the support base 22, which can improve the installation efficiency and is also convenient for disassembly when maintenance or replacement of the arc extinguishing component 3 is required.

[0073] In an alternative embodiment, the first clamping portion 2221 is arranged on the side of the first support plate 222 close to the second support plate 223, and the second clamping portion 2231 is arranged on the side of the second support plate 223 close to the first support plate 222.

[0074] At this time, the first clamping arm 322 of the arc extinguishing grid 32 needs to perform a clamping operation from the space between the first support plate 222 and the second support plate 223. For example, the first clamping portion 2221 can be a groove structure on the inner surface of the first support plate 222, and its shape and size match those of the first clamping arm 322. During installation, the operator inserts the arc extinguishing grid 32 into the space between the first support plate 222 and the second support plate 223, then aligns the first clamping arm 322 with the groove of the first clamping portion 2221, and pushes it in and clamps it tightly. The same applies to the second clamping arm 323 of the arc extinguishing grid 32, which will not be elaborated here.

[0075] The advantage of this setting method is that the clamping connection position is inside the support base 22, which can make the connection between the arc extinguishing grid 32 and the support base 22 closer and more stable, reducing looseness caused by factors such as vibration during the operation of the switching device 100. At the same time, this design can also save space to a certain extent, making the overall structure of the contact arc extinguishing system 200 more compact.

[0076] Referring to Figure 5 and Figure 6 , in some examples, the first clamping portion 2221 is set as the first clamping groove, the second clamping portion 2231 is set as the second clamping groove, the first clamping arm 322 is provided with a first clamping protrusion 3221, the second clamping arm 323 is provided with a second clamping protrusion 3231, the first clamping groove is correspondingly clamped with the first clamping protrusion 3221, and the second clamping groove is correspondingly clamped with the second clamping protrusion 3231.

[0077] Based on the above embodiments of the present application, the setting forms of the first clamping groove and the second clamping groove have the characteristics of simple structure and being easy to process and form. At the same time, the first clamping protrusion 3221 and the second clamping protrusion 3231 also have the characteristics of simple structure and being easy to manufacture. Moreover, the cooperation form of the clamping groove and the clamping protrusion is simple and reliable, which is beneficial to improving the assembly stability and assembly efficiency.

[0078] Among them, referring to Figure 5, the first support plate 222 further includes a first accommodation groove 2222. The first accommodation groove 2222 is provided on the side of the first support plate 222 away from the second support plate 223, and the first clamping groove is opened at the bottom of the first accommodation groove 2222. The first clamping protrusion 3221 is provided at the end of the first clamping arm 322 away from the arc separating cover 31. When the first clamping arm 322 is clamped with the first clamping groove, the first clamping protrusion 3221 is clamped into the first clamping groove, and the rest of the first clamping arm 322 is located in the first accommodation groove 2222. The setting of the first accommodation groove 2222 is used to accommodate the first clamping arm 322. The first clamping arms 322 of the plurality of arc extinguishing grid plates 32 are all located in the first accommodation groove 2222, which can further limit the arc extinguishing assembly 3, improve the assembly stability, and at the same time make the structure of the arc extinguishing assembly 3 and the contact support assembly 2 more compact after forming an independent module.

[0079] Refer to Figure 6 , the second support plate 223 also includes a second accommodation groove 2232. The second accommodation groove 2232 is provided on the side of the second support plate 223 away from the first support plate 222, and the second clamping groove is opened at the bottom of the second accommodation groove 2232. The second clamping protrusion 3231 is provided at the end of the second clamping arm 323 away from the arc separating cover 31. When the second clamping arm 323 is clamped with the second clamping groove, the second clamping protrusion 3231 is clamped into the second clamping groove, and the rest of the second clamping arm 323 is located in the second accommodation groove 2232. This setting form has the same technical effect as the foregoing setting form and will not be elaborated here.

[0080] Refer to Figure 4 and Figure 5 , in some examples, both the first clamping groove and the second clamping groove are opened in a direction perpendicular to the bottom plate 221, and the plurality of arc extinguishing grid plates 32 are parallel to the bottom plate 221 and clamped to the first clamping groove and the second clamping groove.

[0081] Specifically, the first clamping groove is opened on the first support plate 222 in a direction perpendicular to the bottom plate 221, and the second clamping groove is opened on the second support plate 223 in a direction perpendicular to the bottom plate 221. The plurality of arc extinguishing grid plates 32 in the arc extinguishing assembly 3 are all parallel to the bottom plate 221, and the plurality of arc extinguishing grid plates 32 are stacked in a direction perpendicular to the bottom plate 221.

[0082] Based on the above embodiments of the present application, both the first clamping groove and the second clamping groove are opened in a direction perpendicular to the bottom plate 221, which can correspond to the plurality of arc extinguishing grid plates 32 in the arc extinguishing assembly 3, so that each arc extinguishing grid plate 32 is clamped to the clamping groove through the first clamping protrusion 3221 and the second clamping protrusion 3231.

[0083] Refer to Figure 6 and Figure 7, in some examples, both the first clamping groove and the second clamping groove are set as arc-shaped grooves, and both the first clamping protrusion 3221 and the second clamping protrusion 3231 are set as arc-shaped protrusions adapted to the arc-shaped grooves.

[0084] Based on the above embodiments of the present application, by adopting the matching form of the arc-shaped groove and the arc-shaped protrusion, a stable connection between the arc extinguishing component 3 and the contact support component 2 can be achieved, preventing the separation of the arc extinguishing component 3 and the contact support component 2 under the action of external force, which is beneficial to improving the matching stability between the arc extinguishing component 3 and the contact support component 2. At the same time, this matching form also has the characteristics of simple structure, convenient processing, and convenient disassembly and assembly, with high practicability.

[0085] Among them, the edge of the arc-shaped protrusion is arc-shaped. When the first clamping arm 322 is clamped to the support seat 22, the arc-shaped first clamping protrusion 3221 facilitates a small amount of elastic deformation of the first clamping arm 322 when it contacts the first support plate 222, so that the first clamping arm 322 can smoothly enter the first accommodating groove 2222 and be clamped to the first clamping groove. Similarly, when the second clamping arm 323 is clamped to the support seat 22, the arc-shaped second clamping protrusion 3231 facilitates a small amount of elastic deformation of the second clamping arm 323 when it contacts the second support plate 223, so that the second clamping arm 323 can smoothly enter the second accommodating groove 2232 and be clamped to the second clamping groove. This setting form is beneficial to improving the assembly efficiency and can make the arc extinguishing component 3 and the support seat 22 be clamped more tightly, improving the matching reliability between the arc extinguishing component 3 and the contact support component 2.

[0086] Refer to Figure 3 and Figure 4 , in some examples, two sets of arc extinguishing components 3 are provided, and the two sets of arc extinguishing components 3 are oppositely arranged on both sides of the support seat 22.

[0087] Based on the above embodiments of the present application, the two sets of arc extinguishing components 3 can correspond to two moving contacts provided in the contact support component 2. The two sets of arc extinguishing components 3 are oppositely arranged on both sides of the support seat 22, and can extinguish the arcs generated on different moving contacts from different directions to further improve the arc extinguishing effect.

[0088] At the same time, the two sets of arc extinguishing components 3 are relatively fixedly connected to both sides of the contact support component 2, which can improve the matching stability between each set of arc extinguishing components 3 and the contact support component 2 to improve the arc extinguishing effect. Moreover, the two sets of arc extinguishing components 3 and the contact support component 2 form an independent module, which is convenient for the two sets of arc extinguishing components 3 and the contact support component 2 to be assembled into the switch device 100 together, improving the assembly accuracy.

[0089] Refer to Figure 4 and Figure 5, in some examples, the contact arc extinguishing system 200 further includes an arc baffle 4. The arc baffle 4 is connected to the side of the support base 22 facing away from the contact support 21, and the arc baffle 4 extends to the side of the arc extinguishing assembly 3 close to the plane where the bottom plate 221 is located.

[0090] Based on the above embodiments of the present application, the arc baffle 4 can play a role in blocking the arc, preventing the arc from spreading out from the bottom of the arc extinguishing assembly 3, which is beneficial to improving the arc extinguishing effect of the arc extinguishing assembly 3 and reducing the risk brought by the arc spread.

[0091] Specifically, the arc baffle 4 is fixedly connected to the side of the bottom plate 221 facing away from the contact support 21, and the arc baffle 4 extends to both sides to the bottoms of the two groups of arc extinguishing assemblies 3. The arc baffle 4 can block the arc between the arc extinguishing grid plates 32 and the arc baffle 4 at the bottom of the arc extinguishing assembly 3, avoiding the arc from spreading out from the bottom of the arc extinguishing assembly 3, and further enhancing the cooperation reliability between the contact support assembly 2 and the arc extinguishing assembly 3.

[0092] Refer to Figure 1 and Figure 2 , an embodiment of the present application further provides a circuit breaker, including a housing 1, a static contact plate 12, and the above-mentioned contact arc extinguishing system 200. The housing 1 has an installation cavity 11. The contact arc extinguishing system 200 is disposed in the installation cavity 11. The static contact plate 12 is disposed on the housing 1 and extends into the installation cavity 11. The moving contact can contact or separate from the static contact plate 12 as the contact support 21 moves.

[0093] Based on the above embodiments of the present application, the circuit breaker with the above-mentioned contact arc extinguishing system 200 effectively improves the cooperation stability between the contact support assembly 2 and the arc extinguishing assembly 3 by fixedly connecting the contact support assembly 2 and the arc extinguishing assembly 3, thereby improving the arc extinguishing effect of the arc extinguishing assembly 3, reducing the influence of the arc on other components in the circuit breaker, and improving the use safety of the circuit breaker. At the same time, the contact arc extinguishing system 200 forms an independent module, which can not only keep the positions of the contact support assembly 2 and the arc extinguishing assembly 3 relatively fixed all the time, improving the assembly accuracy, but also facilitate the overall assembly into the housing 1 of the circuit breaker, improving the overall assembly efficiency of the circuit breaker.

[0094] Among them, a part of the static contact plate 12 is used to connect the circuit breaker to an external circuit, and another part of the static contact plate 12 extends into the installation cavity 11 and forms a static contact. The static contact is relatively fixed on the housing 1. The moving contact can contact or separate from the static contact plate 12 as it moves on the support base 22 of the contact support 21. When the moving contact separates from the static contact, an arc may be generated between them. The generated arc is located between the first support plate 222 and the second support plate 223. The arc extinguishing grid plates 32 in the arc extinguishing assembly 3 are fixedly connected to the first support plate 222 and the second support plate 223, so that the arc can smoothly and completely enter the arc extinguishing assembly 3, effectively improving the arc extinguishing ability of the arc extinguishing assembly 3.

[0095] Reference Figure 8

[0096] In the embodiment of the present application, three adjacent installation cavities 11 are provided on the housing 1, and three groups of contact arc extinguishing systems 200 are correspondingly provided. The three groups of contact arc extinguishing systems 200 are correspondingly installed in the three installation cavities 11, and each group of contact arc extinguishing systems 200 corresponds to a group of static contact plates 12, so that the circuit breaker has a certain on-off ability and a stable arc extinguishing ability. The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A contact arc extinguishing system, characterized in that: Applied to a switch device, the switch device comprises a housing, the housing has a mounting cavity, the contact arc extinguishing system is arranged in the mounting cavity, and the contact arc extinguishing system comprises: A contact support assembly, comprising a contact support and a support seat, wherein the contact support is arranged on the support seat, and the contact support is used to support a moving contact; An arc extinguishing assembly comprises an arc extinguishing cover and a plurality of arc extinguishing grids, wherein the plurality of arc extinguishing grids are arranged on the arc extinguishing cover at intervals; A side of the plurality of arc-extinguishing grids away from the arc-isolating cover is fixedly connected to the support base to form an independent module.

2. The contact arc extinguishing system according to claim 1, characterized in that: The support base comprises a bottom plate and a first support plate and a second support plate spaced apart from each other on the bottom plate, and the contact support is arranged between the first support plate and the second support plate; The arc extinguishing grid has an opening on a side away from the arc isolation cover, and the opening faces the space between the first supporting plate and the second supporting plate.

3. The contact arc extinguishing system according to claim 2, characterized in that: A first clamping portion is provided on the first supporting plate, a second clamping portion is provided on the second supporting plate, a first clamping arm and a second clamping arm are provided on a side of the arc extinguishing grid away from the arc isolation cover, the first clamping arm and the second clamping arm are spaced apart to form the opening, the first clamping arm is clamped to the first clamping portion, and the second clamping arm is clamped to the second clamping portion.

4. The contact arc extinguishing system according to claim 3, characterized in that: The first clamping portion is arranged on a side of the first support plate away from the second support plate, and the second clamping portion is arranged on a side of the second support plate away from the first support plate, or the first clamping portion is arranged on a side of the first support plate close to the second support plate, and the second clamping portion is arranged on a side of the second support plate close to the first support plate.

5. The contact arc extinguishing system according to claim 3, characterized in that: The first clamping portion is configured as a first clamping groove, the second clamping portion is configured as a second clamping groove, the first clamping arm is provided with a first clamping protrusion, the second clamping arm is provided with a second clamping protrusion, the first clamping groove is correspondingly clamped with the first clamping protrusion, and the second clamping groove is correspondingly clamped with the second clamping protrusion.

6. The contact arc extinguishing system according to claim 5, characterized in that: The first clamping groove and the second clamping groove are both opened in a direction perpendicular to the bottom plate, and the plurality of arc-extinguishing grids are parallel to the bottom plate and clamped to the first clamping groove and the second clamping groove.

7. The contact arc extinguishing system according to claim 6, characterized in that: The first clamping groove and the second clamping groove are both configured as arc-shaped grooves, and the first clamping protrusion and the second clamping protrusion are both configured as arc-shaped protrusions adapted to the arc-shaped grooves.

8. The contact arc extinguishing system according to any one of claims 1 to 7, characterized in that: The arc extinguishing components are provided in two groups, and the two groups of arc extinguishing components are arranged oppositely on two sides of the supporting seat.

9. The contact arc extinguishing system according to claim 2, characterized in that: The contact arc extinguishing system also includes an arc baffle plate, which is connected to a side of the support base away from the contact support, and extends to a side of the arc extinguishing assembly close to the plane where the base plate is located.

10. A circuit breaker, characterized in that: It includes a shell, a static contact plate and a contact arc extinguishing system as described in any one of claims 1 to 9, the shell has an installation cavity, the contact arc extinguishing system is arranged in the installation cavity, the static contact plate is arranged on the shell and extends into the installation cavity, and the moving contact can contact or separate from the static contact plate as the contact supports movement.

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