Arc extinguish chamber and circuit breaker

Abstract

The invention relates to the technical field of circuit breakers, and provides an arc extinguish chamber and a circuit breaker.The arc extinguish chamber comprises a supporting assembly, an insulating pull rod and a moving contact, the supporting assembly is provided with a first cavity section, a second cavity section, a communicating hole and a first opening communicating with the second cavity section, and the first cavity section communicates with the second cavity section through the communicating hole; the second cavity section is used for being communicated with the outside of the supporting assembly through the first opening, the insulating pull rod is movably arranged in the second cavity section, the moving contact movably penetrates through the communicating hole and is provided with a penetrating flow channel and a second opening communicated with the penetrating flow channel, the penetrating flow channel is used for guiding an electric arc, and the penetrating flow channel passes through the second opening and is communicated with the insulating pull rod. And the first cavity section is communicated with at least one of the first cavity section, the second cavity section and the communicating hole. The circuit breaker can solve the problems that high-temperature and high-voltage arc gas in the circuit breaker can cause serious faults such as contact ablation, insulation pull rod damage, fracture insulation strength reduction and even shell breakdown.

Description

Technical Field

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

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current under normal circuit conditions, and can close, carry, and interrupt current under abnormal circuit conditions within a specified time.

[0003] When a circuit breaker interrupts a short-circuit current, a high-temperature, high-pressure electric arc gas is generated at the instant the moving and stationary contacts separate.

[0004] In related technologies, the presence of high-temperature and high-pressure arc gas inside circuit breakers can lead to serious faults such as contact erosion, damage to insulating rods, reduced insulation strength at the break point, and even casing breakdown. Summary of the Invention

[0005] This application provides an arc-extinguishing chamber and a circuit breaker, which can solve the problem that high-temperature and high-pressure arc gas inside the circuit breaker can cause serious faults such as contact erosion, damage to insulating rods, reduced insulation strength at the break point, and even casing breakdown.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides an arc-extinguishing chamber, comprising:

[0008] A support assembly having a first cavity, a second cavity, a connecting hole, and a first opening communicating with the second cavity. The first cavity and the second cavity are connected through the connecting hole, and the second cavity is used to communicate with the outside of the support assembly through the first opening.

[0009] An insulating pull rod is movably disposed within the second cavity.

[0010] A movable contact is movably disposed in the communicating hole. The movable contact has a through flow channel and a second opening communicating with the through flow channel. The through flow channel is used to guide the electric arc.

[0011] The through-flow channel communicates with at least one of the first cavity segment, the second cavity segment, and the connecting hole through the second opening.

[0012] In some embodiments, multiple through channels are provided, and the multiple through channels are spaced apart along the circumferential direction of the moving contact;

[0013] The second opening is provided in multiple ways, and the multiple second openings are spaced apart along the circumferential direction of the moving contact;

[0014] The multiple through channels and the multiple second openings are connected in a one-to-one manner.

[0015] In some implementations, it also includes:

[0016] A first air baffle is disposed in the second cavity. The first air baffle has a connecting end and an open end. The connecting end is connected to the inner wall of the support assembly, and the open end extends toward the side close to the moving contact and is spaced apart from the outer peripheral wall of the moving contact.

[0017] The first opening is located between the connecting end and the communicating hole.

[0018] In some embodiments, the wall of the first air deflector forms an angle with the inner wall of the support assembly, the opening of the angle facing the side closer to the connecting hole, and the angle is an acute angle.

[0019] In some embodiments, the first air deflector extends toward the side closer to the communication hole;

[0020] And / or, along the direction from the connecting hole to the second cavity segment, a portion of the surface of the support assembly is narrowed.

[0021] In some implementations, it also includes:

[0022] The second air baffle is spaced out and sleeved on the outside of the support assembly. The inner sidewall of the second air baffle and the outer peripheral wall of the support assembly form an exhaust duct, which is connected to the first opening.

[0023] In some embodiments, the support component includes:

[0024] An insulating cylinder, wherein the insulating rod is movably disposed on the insulating cylinder;

[0025] A movable support is connected to the insulating cylinder, the first cavity and the communicating hole are provided on the movable support, and the insulating cylinder and the movable support enclose the second cavity;

[0026] A movable contact seat is disposed within the movable support, and the movable contact is movably disposed in the movable contact seat. The movable contact seat is used to support the movable contact.

[0027] In some implementations, it also includes:

[0028] A shielding cover is disposed within the second cavity and is connected to at least one of the inner sidewall of the support assembly and / or the connecting end of the first air shield.

[0029] The shielding cover has a third opening, and the insulating rod passes through the third opening.

[0030] In some implementations, it also includes:

[0031] The tank body is fitted onto the outside of the support assembly, and the inner sidewall of the tank body is spaced apart from the outer peripheral wall of the support assembly.

[0032] Secondly, this application provides a circuit breaker including an arc-extinguishing chamber.

[0033] The arc-extinguishing chamber of this structure, through the provision of a support assembly, can support and protect the insulating tie rod and the moving contact. By providing a through-flow channel and a second opening on the moving contact, the arc can pass through the through-flow channel and the second opening and enter at least one of the first cavity section, the second cavity section, and the connecting hole, and further exit through the first opening to the outside of the support assembly. This allows high-temperature and high-pressure fluid to be introduced into the arc-extinguishing chamber during the circuit breaker's opening process, and to be rapidly exited through the arc-extinguishing chamber, thereby reducing the damage to the circuit breaker caused by the high-temperature and high-pressure fluid. Furthermore, by connecting the second opening to at least one of the first cavity section, the second cavity section, and the connecting hole, and by connecting the first cavity section, the connecting hole, the second cavity section, and the first opening, the high-temperature and high-pressure fluid can have more flow paths after passing through the through-flow channel and the second opening, and form segmented airflow exit paths, thereby accelerating the exit of the high-temperature and high-pressure fluid in the arc-extinguishing chamber.

[0034] Therefore, the arc-extinguishing chamber provided in the embodiments of this application can solve the problem that high-temperature and high-pressure arc gas inside the circuit breaker can cause serious faults such as contact erosion, damage to insulating rods, reduced insulation strength at the break point, and even casing breakdown. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the main structure of the arc-extinguishing chamber provided in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100-Support assembly; 101-First cavity section; 102-Second cavity section; 103-Connecting hole; 104-First opening; 105-Insulating cylinder; 1051-Cylinder body; 1052-Support base; 106-Moving support; 1061-Second vent hole; 107-Moving contact base; 1071-First vent hole;

[0039] 200-Insulated Tie Rod;

[0040] 300 - Moving contact; 301 - Second opening;

[0041] 400 - First air deflector;

[0042] 500 - Second air deflector;

[0043] 600-Shielding cover;

[0044] 700 - Tank body. Detailed Implementation

[0045] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0046] To overcome the shortcomings of existing technologies, a support assembly is provided to support and protect the insulating rod and moving contact. By setting a through-flow channel and a second opening on the moving contact, the arc can pass through the through-flow channel and the second opening and enter at least one of the first cavity, the second cavity, and the connecting hole. It can then be discharged to the outside of the support assembly through the first opening. This allows high-temperature and high-pressure fluid to be introduced into the arc-extinguishing chamber during the circuit breaker's opening process, and the high-temperature and high-pressure fluid can be quickly discharged through the arc-extinguishing chamber, reducing the damage to the circuit breaker caused by the high-temperature and high-pressure fluid. Furthermore, by connecting the second opening to at least one of the first cavity, the second cavity, and the connecting hole, and connecting the first cavity, the connecting hole, the second cavity, and the first opening, the high-temperature and high-pressure fluid can have more flow paths after passing through the through-flow channel and the second opening, and form segmented airflow discharge paths, thereby accelerating the discharge of high-temperature and high-pressure fluid from the arc-extinguishing chamber.

[0047] Therefore, the arc-extinguishing chamber provided in the embodiments of this application can solve the problem that high-temperature and high-pressure arc gas inside the circuit breaker can cause serious faults such as contact erosion, damage to insulating rods, reduced insulation strength at the break point, and even casing breakdown.

[0048] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0049] like Figure 1As shown, this application provides an arc-extinguishing chamber, including: a support assembly 100, an insulating pull rod 200, and a moving contact 300. The support assembly 100 has a first cavity 101, a second cavity 102, a connecting hole 103, and a first opening 104 communicating with the second cavity 102. The first cavity 101 and the second cavity 102 are connected through the connecting hole 103. The second cavity 102 is used to communicate with the outside of the support assembly 100 through the first opening 104. The insulating pull rod 200 is movably disposed in the second cavity 102. The moving contact 300 is movably disposed through the connecting hole 103. The moving contact 300 has a through flow channel and a second opening 301 communicating with the through flow channel. The through flow channel is used to guide the electric arc. The through flow channel is connected to at least one of the first cavity 101, the second cavity 102, and the connecting hole 103 through the second opening 301.

[0050] The following sections provide a detailed description of the specific structure of the arc-extinguishing chamber and the circuit breaker, as well as various possible implementation methods.

[0051] It should be noted that the through flow channel can be connected to the first cavity segment 101 through the second opening 301, or the through flow channel can be connected to the second cavity segment 102 through the second opening 301, or the through flow channel can be connected to the connecting hole 103 through the second opening 301, or the through flow channel can be connected to the first cavity segment 101 and the connecting hole 103 through the second opening 301 respectively, or the through flow channel can be connected to the second cavity segment 102 and the connecting hole 103 through the second opening 301 respectively, or the through flow channel can be connected to the first cavity segment 101 and the second cavity segment 102 through the second opening 301 respectively, or the through flow channel can be connected to the first cavity segment 101, the second cavity segment 102 and the connecting hole 103 through the second opening 301 respectively. There are no restrictions here, and the selection can be made according to the actual use requirements.

[0052] It should be noted that the through flow channel can be connected to the first cavity segment 101 and the second cavity segment 102 through the second opening 301 respectively. There can be two second openings 301, one of which is connected to the first cavity segment 101 and the other is connected to the second cavity segment 102.

[0053] It should be noted that the through flow channel can be connected to the first cavity 101, the second cavity 102 and the connecting hole 103 through the second opening 301 respectively. The second opening 301 can be an oblong hole, which is connected to the first cavity 101, the second cavity 102 and the connecting hole 103 at the same time.

[0054] It should be noted that a stationary contact is provided on the side of the moving contact 300 away from the insulating pull rod 200. At the moment when the moving contact 300 separates from the stationary contact, due to the strong electric field and high temperature, the air between the moving contact 300 and the stationary contact will be ionized, forming a high-temperature, luminous plasma arc. The arc can be guided to the second opening 301 through the through channel.

[0055] Furthermore, at the instant the moving contact 300 separates from the stationary contact, the insulating rod 200 drives the moving contact 300 to move, so that the moving contact 300 and the stationary contact separate quickly.

[0056] The embodiments of this application provide multiple through channels, which are spaced apart along the circumferential direction of the moving contact 300. Multiple second openings 301 are provided, which are spaced apart along the circumferential direction of the moving contact 300. The multiple through channels and the multiple second openings 301 are connected in a one-to-one correspondence.

[0057] It is understandable that by increasing the number of through channels and second openings 301, the through channels can divide the electric arc into multiple short arcs. These multiple short arcs can pass through different through channels and second openings 301 respectively, thereby achieving the discharge of the electric arc. Through the above implementation method, the electric arc can be separated, and the contact area between the electric arc and the through channels can be increased to increase the discharge speed of the electric arc.

[0058] It should be noted that the number of through channels can be one, two, three, or any other number greater than or equal to one. There is no restriction here, and the number can be selected according to actual usage requirements.

[0059] Furthermore, the number of second openings 301 can be the same as the number of through channels.

[0060] In one embodiment, two through channels are provided, which are spaced apart along the circumferential direction of the moving contact 300. Two second openings 301 are provided, both of which are waist-shaped elongated holes.

[0061] It is understood that, through the above implementation method, the through flow channel can divide the electric arc into two short arcs, which can pass through two different through flow channels and two different second openings 301 respectively, so as to realize the discharge of the electric arc and the separation of the electric arc, thereby increasing the contact area between the electric arc and the through flow channel and thus increasing the discharge speed of the electric arc.

[0062] The arc-extinguishing chamber provided in the embodiments of this application further includes: a first air baffle 400, which is disposed in the second cavity 102. The first air baffle 400 has a connecting end and an open end. The connecting end is connected to the inner sidewall of the support assembly 100, and the open end extends toward the side close to the moving contact 300 and is spaced apart from the outer peripheral wall of the moving contact 300. The first opening 104 is located between the connecting end and the connecting hole 103.

[0063] It is understandable that by setting the first air baffle 400, the first air baffle 400 can shield the high-temperature airflow in the second cavity 102, thereby reducing the direct impact of the high-temperature airflow on the insulating rod 200 and protecting the insulating rod 200. The first opening 104 is located between the connecting end and the connecting hole 103, which allows the first air baffle 400 to reflect the high-temperature airflow in the second cavity 102 to a certain extent. The airflow reflected by the second air baffle 500 can be discharged to the outside of the support assembly 100 through the second cavity 102 and the first opening 104, thereby realizing the discharge of the high-temperature airflow in the second cavity 102. Moreover, the above implementation can reduce the impact force of the high-temperature airflow in the second cavity 102, thereby protecting other structures in the arc-extinguishing chamber.

[0064] It should be noted that the material of the first air deflector 400 can be copper alloy, copper-plated steel sheet, engineering plastic, or other materials that can play a guiding role. There are no restrictions here, and it can be selected according to the actual use requirements.

[0065] It should be noted that the shape of the first air deflector 400 can be conical or annular; there are no restrictions, and the shape can be selected according to actual usage requirements.

[0066] In one embodiment, the wall of the first air deflector 400 forms an angle with the inner wall of the support assembly 100, the opening of the angle facing the side closer to the connecting hole 103, and the angle is an acute angle.

[0067] It is understood that, through the above-described embodiments, the first air baffle 400 can shield the high-temperature airflow in the second cavity 102, thereby reducing the direct impact of the high-temperature airflow on the insulating rod 200 and protecting the insulating rod 200. Furthermore, the first opening 104 is located between the connecting end and the connecting hole 103, allowing the first air baffle 400 to reflect the high-temperature airflow in the second cavity 102 to a certain extent. The airflow reflected by the second air baffle 500 can be discharged to the outside of the support assembly 100 through the second cavity 102 and the first opening 104, thereby achieving the discharge of the high-temperature airflow in the second cavity 102. Moreover, the above-described embodiments can reduce the impact force of the high-temperature airflow in the second cavity 102, thereby protecting other structures within the arc-extinguishing chamber. In addition, through the above-described embodiments, the high-temperature gas in the second cavity 102 can have a smaller cross-sectional diameter of the flow channel closer to the first opening 104 when passing through the angle between the first baffle 400 and the support assembly 100, thereby increasing the flow velocity of the high-temperature gas and accelerating the discharge of the high-temperature gas in the second cavity 102, thereby reducing the accumulation of heat in the arc-extinguishing chamber.

[0068] It should be noted that the included angle provided in the embodiments of this application is an acute angle, which has a variety of different formation methods. The following are examples illustrating the formation methods of the included angle being an acute angle.

[0069] In one possible implementation, the first air deflector 400 extends toward the side closer to the connecting hole 103.

[0070] It is understood that, through the above-described embodiments, the first air deflector 400 can be made to have a conical shape, and the outer peripheral wall of the first air deflector 400 can be made to form an acute angle with the inner side wall of the support assembly 100.

[0071] In one possible implementation, a portion of the surface of the support assembly 100 is narrowed along the direction from the connecting hole 103 to the second cavity 102.

[0072] It is understood that, through the above-described embodiments, a portion of the surface of the support component 100, which is configured with a constricted opening, can form an acute angle with the outer peripheral wall of the first air deflector 400.

[0073] In one embodiment, the first air deflector 400 extends toward the side near the connecting hole 103, and a portion of the surface of the support assembly 100 is narrowed along the direction from the connecting hole 103 to the second cavity 102.

[0074] It is understood that, through the above-described embodiments, the first air deflector 400 can be made to have a conical shape, and the outer peripheral wall of the first air deflector 400 can be made to form an acute angle with the inner side wall of the support assembly 100.

[0075] It is understandable that there are no restrictions on the specific way the included angle is acute, and it can be selected according to the actual needs of use.

[0076] The arc-extinguishing chamber provided in the embodiments of this application further includes: a second air baffle 500, which is spaced out and sleeved on the outside of the support assembly 100. The inner sidewall of the second air baffle 500 and the outer peripheral wall of the support assembly 100 enclose each other to form an exhaust air duct, which is connected to the first opening 104.

[0077] It is understood that, through the above-described embodiments, the high-temperature and high-pressure fluid discharged from the first opening 104 can be further guided to other locations outside the support assembly 100 through the discharge duct, thereby reducing the occurrence of heat concentration at the first opening 104 and reducing the occurrence of high-temperature and high-pressure fluid breaking down the circuit breaker housing. Furthermore, the arrangement of the discharge duct can increase the heat exchange area between the high-temperature and high-pressure fluid discharged from the first opening 104 and the discharge duct, thereby dissipating heat from the high-temperature and high-pressure fluid.

[0078] It should be noted that the material of the second air deflector 500 can be copper alloy, copper-plated steel sheet, engineering plastic, or other materials that can play a guiding role. There are no restrictions here, and it can be selected according to the actual use requirements.

[0079] The support assembly 100 provided in the embodiments of this application includes: an insulating cylinder 105, a movable support 106, and a movable contact seat 107. An insulating pull rod 200 is movably disposed on the insulating cylinder 105. The movable support 106 is connected to the insulating cylinder 105. A first cavity 101 and a connecting hole 103 are disposed on the movable support 106. The insulating cylinder 105 and the movable support 106 enclose a second cavity 102. The movable contact seat 107 is disposed inside the movable support 106. A movable contact 300 is movably disposed on the movable contact seat 107. The movable contact seat 107 is used to support the movable contact 300.

[0080] It is understood that, through the above-described embodiments, the insulating cylinder 105 and the movable support 106 can be separately installed to facilitate the installation and disassembly of the insulating pull rod 200, the movable contact 300, and the first air baffle 400, and to facilitate the processing and disassembly of the arc-extinguishing chamber. The movable contact seat 107 provides support for the movable contact 300, ensuring its stable installation within the arc-extinguishing chamber. The movable support 106 provides support and protection for both the movable contact seat 107 and the movable contact 300, thereby extending the service life of the arc-extinguishing chamber.

[0081] It should be noted that when the moving contact 300 is movably disposed on the moving contact seat 107, the moving contact seat 107 is provided with an installation channel, the moving contact 300 is movably disposed in the installation channel, the outer peripheral wall of the moving contact seat 107 is provided with a first vent hole 1071, one end of the first vent hole 1071 is connected to the installation channel, and the moving support 106 is provided with a second vent hole 1061, the second vent hole 1061 is connected to the other end of the first vent hole 1071 and the connecting hole 103 respectively.

[0082] Furthermore, in this case, the installation channel, the first vent 1071, and the second vent 1061 together enclose and form the first cavity 101.

[0083] It is understood that the above-described embodiments can improve the flexibility of the first cavity 101 and allow the through flow channel to communicate with the second cavity 102 through the second opening 301, the first cavity 101 and the connecting hole 103, so that high-temperature and high-pressure fluid can be introduced into the arc extinguishing chamber.

[0084] It should be noted that the insulating cylinder 105 includes a cylinder body 1051 and a support base 1052. One end of the cylinder body 1051 is connected to the movable support 106, and the other end of the cylinder body 1051 away from the movable support 106 is connected to the support base 1052.

[0085] It is understood that the above-described embodiments facilitate the disassembly and installation of the insulating cylinder 105.

[0086] Furthermore, the cylinder 1051 and the support base 1052 can be connected by integral molding, or the cylinder 1051 and the support base 1052 can be connected by bolts. There are no restrictions here, and the choice can be made according to the actual use requirements.

[0087] It should be noted that the movable support 106 can be made of a material with high thermal conductivity, such as copper, aluminum, silver, or an alloy of the above materials. There are no restrictions here, and it can be selected according to the actual use requirements.

[0088] In one embodiment, the movable support 106 is made of aluminum alloy.

[0089] It is understood that through the above-described embodiments, the high-temperature and high-pressure fluid inside the movable support 106 can exchange heat with the aluminum alloy movable support 106, thereby reducing the internal temperature of the high-temperature and high-pressure fluid. Furthermore, by exchanging heat between the aluminum alloy movable support 106 and the air outside the arc-extinguishing chamber, the temperature of the aluminum alloy movable support 106 is reduced, which facilitates heat dissipation from the arc-extinguishing chamber. Additionally, the high-temperature and high-pressure fluid inside the support assembly 100 can achieve rapid heat dissipation.

[0090] The arc-extinguishing chamber provided in the embodiments of this application further includes: a shield 600, which is disposed in the second cavity 102 and connected to at least one of the inner sidewall of the support assembly 100 and / or the connecting end of the first air baffle 400. The shield 600 has a third opening, through which the insulating pull rod 200 passes.

[0091] Understandably, by setting up the shield 600, the flow of high-temperature and high-pressure fluid in the second cavity 102 can be blocked to protect the insulating pull rod 200.

[0092] It should be noted that the shield 600 can be connected to the inner wall of the support component 100, or the shield 600 can be connected to the connecting end of the first air baffle 400, or the shield 600 can be connected to both the inner wall of the support component 100 and the connecting end of the first air baffle 400. There are no restrictions here, and the appropriate option can be selected according to actual usage requirements.

[0093] It should be noted that when the shielding cover 600 is connected to the inner wall of the support assembly 100, the shielding cover 600 can be connected to the inner wall of the movable support 106.

[0094] The arc-extinguishing chamber provided in the embodiments of this application further includes a tank 700, which is sleeved on the outside of the support assembly 100, and the inner sidewall of the tank 700 is spaced apart from the outer peripheral wall of the support assembly 100.

[0095] Understandably, by setting up the tank 700, the support assembly 100 and the components inside the support assembly 100 can be protected, thereby improving the safety of the arc-extinguishing chamber.

[0096] Embodiments of this application provide a circuit breaker including the arc-extinguishing chamber provided in any of the above embodiments.

[0097] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0098] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0099] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0100] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An arc-extinguishing chamber, characterized in that, include: A support assembly (100) has a first cavity (101), a second cavity (102), a connecting hole (103), and a first opening (104) communicating with the second cavity (102). The first cavity (101) and the second cavity (102) are connected through the connecting hole (103), and the second cavity (102) is used to communicate with the outside of the support assembly (100) through the first opening (104). An insulating pull rod (200) is movably disposed within the second cavity (102); A movable contact (300) is movably disposed in the connecting hole (103). The movable contact (300) has a through flow channel and a second opening (301) communicating with the through flow channel. The through flow channel is used to guide the electric arc. The through-flow channel is connected to at least one of the first cavity segment (101), the second cavity segment (102), and the connecting hole (103) through the second opening (301).

2. The arc-extinguishing chamber according to claim 1, characterized in that, Multiple through channels are provided, and the multiple through channels are spaced apart along the circumferential direction of the moving contact (300); Multiple second openings (301) are provided, and the multiple second openings (301) are spaced apart along the circumferential direction of the moving contact (300); The multiple through channels and the multiple second openings (301) are connected in a one-to-one manner.

3. The arc-extinguishing chamber according to claim 1, characterized in that, Also includes: A first air baffle (400) is disposed in the second cavity (102). The first air baffle (400) has a connecting end and an open end. The connecting end is connected to the inner wall of the support assembly (100), and the open end extends toward the side close to the moving contact (300) and is spaced apart from the outer peripheral wall of the moving contact (300). The first opening (104) is located between the connecting end and the connecting hole (103).

4. The arc-extinguishing chamber according to claim 3, characterized in that, The wall of the first air deflector (400) forms an angle with the inner wall of the support assembly (100), the opening of the angle facing the side closer to the connecting hole (103), and the angle is an acute angle.

5. The arc-extinguishing chamber according to claim 4, characterized in that, The first air deflector (400) extends toward the side near the connecting hole (103); And / or, along the direction from the connecting hole (103) to the second cavity (102), a portion of the surface of the support assembly (100) is narrowed.

6. The arc-extinguishing chamber according to any one of claims 1-5, characterized in that, Also includes: The second air baffle (500) is spaced out and sleeved on the outside of the support assembly (100). The inner sidewall of the second air baffle (500) and the outer peripheral wall of the support assembly (100) form an exhaust duct. The exhaust duct is connected to the first opening (104).

7. The arc-extinguishing chamber according to any one of claims 1-5, characterized in that, The support component (100) includes: An insulating cylinder (105) is provided, and the insulating pull rod (200) is movably disposed on the insulating cylinder (105). A movable support (106) is connected to the insulating cylinder (105). The first cavity section (101) and the connecting hole (103) are provided on the movable support (106). The insulating cylinder (105) and the movable support (106) enclose the second cavity section (102). A movable contact seat (107) is disposed within the movable support (106), and the movable contact (300) is movably disposed in the movable contact seat (107). The movable contact seat (107) is used to support the movable contact (300).

8. The arc-extinguishing chamber according to any one of claims 1-5, characterized in that, Also includes: A shield (600) is disposed within the second cavity (102) and is connected to at least one of the inner sidewall of the support assembly (100) and / or the connecting end of the first air shield (400); The shield (600) has a third opening, through which the insulating rod (200) passes.

9. The arc-extinguishing chamber according to any one of claims 1-5, characterized in that, Also includes: The tank (700) is fitted outside the support assembly (100), and the inner wall of the tank (700) is spaced apart from the outer peripheral wall of the support assembly (100).

10. A circuit breaker, characterized in that, The arc-extinguishing chamber includes any one of claims 1-9.

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