Arc extinguish chamber and circuit breaker

Abstract

The invention relates to the technical field of circuit breakers, in particular to an arc extinguish chamber and a circuit breaker. The arc extinguish chamber comprises an insulating part, a plurality of grid sheets which are sequentially arranged at intervals and two insulating heat insulation parts; according to the utility model, by arranging the insulating heat-insulating parts on the two sides of the extending direction of the arc striking channel and at the positions adjacent to the leg parts of the grid sheets, an effective thermal physical barrier is formed, heat entering the insulating parts through heat conduction is greatly reduced, the insulating parts can be maintained at a relatively low working temperature, and the service life of the insulating parts is prolonged. Therefore, the risk that an arc striking channel is blocked due to overheating melting caused by the fact that the insulating part is too close to or attached to the main body of the grid plate is thoroughly avoided, a fundamental guarantee is provided for reliable breaking of an arc extinguish chamber under the condition of high voltage and large current, and the service life of key components in the circuit breaker is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to an arc-extinguishing chamber and a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of connecting, carrying, and disconnecting current in a normal circuit, and simultaneously capable of closing, carrying, and disconnecting current in an abnormal circuit within a specified time. With the rapid development of the new energy industry, there is a more urgent need for the breaking capacity of circuit breakers and other protective electrical appliances under high voltage and high current conditions. However, when a circuit breaker interrupts a high voltage and high current fault, the arcing energy generated inside it rises sharply, easily causing severe thermal damage and impact to key components such as the insulating parts and metal grids in the arc-extinguishing chamber.

[0003] In existing conventional arc-extinguishing chamber designs, the insulating component is partially embedded between adjacent grid plates and directly wraps around the legs of the grid plates; some designs also include features such as bosses to form a fitted structure with the grid plates; and in some designs, the two inner walls of the insulating component extend directly into the slots of the grid plates. Such structures have inherent defects during high-current breaking. Under the high temperature of the electric arc, the grid plates heat up rapidly, and the heat is directly conducted to the insulating component in contact with them, causing the insulating component to deform or melt upon heating. The molten gas-generating material condenses and adheres again in the gaps between the grid plates, easily clogging the grid plate slots. The blockage of the grid plate slots reduces or even completely closes the effective cross-sectional area of ​​the arc-ignition channel, hindering the arc from smoothly entering the interior of the grid plates. The consequence is that the arc cannot be effectively cut and stretched by the grid plates to increase the arc voltage, ultimately leading to circuit breaker breaking failure. Summary of the Invention

[0004] (i) The problem to be solved by the present invention is that when the existing arc-extinguishing chamber interrupts high voltage and high current faults, the insulating parts are prone to deformation or melting after being heated.

[0005] (II) Technical Solution To address the aforementioned technical problems, one embodiment of the present invention provides an arc-extinguishing chamber, which includes: an insulating component, a plurality of sequentially spaced grid plates, and two insulating and heat-insulating components; The grid plate includes a main body and two legs. The two legs are spaced apart on the main body, and a slot is formed between the two legs. The slots of each grid plate together form an arc-starting channel. The extending direction of the insulating and heat-insulating member is the same as the extending direction of the arc-initiating channel; the two insulating and heat-insulating members are spaced apart on both sides of the extending direction of the arc-initiating channel, and the two insulating and heat-insulating members are respectively close to the two legs of each of the grid plates; The insulating component is provided with a covering cavity, the covering cavity having a first sidewall located within the arc-starting channel, the end of the leg facing away from the main body being inserted into the covering cavity, the lower end of the first sidewall being spaced apart from the bottom of the arc-starting channel; the upper end of the insulating and heat-insulating component extends to the inner wall of the covering cavity; or, the insulating and heat-insulating component covers the leg, and the insulating component is covered by the covering cavity outside the insulating and heat-insulating component.

[0006] Optionally, the distance between the lower end of the first sidewall and the bottom of the arc-initiating channel is greater than or equal to 2 mm.

[0007] Optionally, the main body is provided with two slots that correspond one-to-one with the insulating and heat-insulating components; the lower end of the insulating and heat-insulating component is inserted into the corresponding slot.

[0008] Optionally, when the upper end of the insulating and heat-insulating member extends to the inner wall of the covering cavity, each leg is provided with a protruding edge that mates with the slot. The protruding edge and the slot together form a receiving space, and the insulating and heat-insulating member is inserted into the receiving space.

[0009] Optionally, when the insulating and heat-insulating member covers the legs, the insulating and heat-insulating member includes a first plate, a second plate, and a third plate; the first plate and the second plate are disposed opposite to each other, the two ends of the third plate are respectively connected to the upper ends of the first plate and the upper ends of the second plate, and the lower end of the first plate is inserted into the corresponding slot; the legs of the grid are inserted between the first plate, the second plate, and the third plate.

[0010] Optionally, the insulating and heat-insulating component is red steel cardboard.

[0011] Optionally, the arc-extinguishing chamber further includes two side plates; the two side plates are arranged opposite each other and spaced apart, and a plurality of grid plates are spaced apart between the two side plates along the extending direction of the side plates.

[0012] Optionally, the insulating element is fixedly disposed on both sides of the two side plates.

[0013] Optionally, a slot is provided on the side plate, and a buckle is provided on the insulating component, which is then engaged and fixed with the slot by the buckle.

[0014] Another embodiment of the present invention also provides a circuit breaker, including any of the arc-extinguishing chambers described above.

[0015] The beneficial effects of this invention are: This invention provides an arc-extinguishing chamber, comprising: an insulating component, a plurality of sequentially spaced grid plates, and two insulating and heat-insulating components; each grid plate includes a main body and two legs, the two legs being spaced apart on the main body, forming a slot between the two legs, and the slots of each grid plate collectively forming an arc-ignition channel; the extending direction of the insulating and heat-insulating components is the same as the extending direction of the arc-ignition channel; the two insulating and heat-insulating components are spaced apart on both sides of the extending direction of the arc-ignition channel, and the two insulating and heat-insulating components are respectively close to the two legs of each grid plate; the insulating component is provided with a covering cavity, the covering cavity having a first sidewall located within the arc-ignition channel, one end of each leg away from the main body being inserted into the covering cavity, and the lower end of the first sidewall being spaced apart from the bottom of the arc-ignition channel; the upper end of the insulating and heat-insulating component extends to the inner wall of the covering cavity; or, the insulating and heat-insulating component covers the legs, and the insulating component is covered by the covering cavity outside the insulating and heat-insulating component.

[0016] By installing insulating and heat-insulating components on both sides of the arc-ignition channel extension direction and adjacent to the legs of each grid plate, an effective thermal physical barrier is formed, which greatly reduces the heat entering the insulating components through heat conduction. This ensures that the insulating components can be maintained at a relatively low operating temperature, thereby completely avoiding the risk of the arc-ignition channel being blocked due to overheating and melting caused by the insulating components being too close to or attached to the main body of the grid plate. This provides a fundamental guarantee for the reliable interruption of the arc-extinguishing chamber under high voltage and high current conditions and greatly improves the service life of key internal components of the circuit breaker. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the arc-extinguishing chamber in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the arc-extinguishing chamber in Embodiment 1 of the present invention; Figure 3 This is a diagram showing the positional relationship between the grid, the insulating component, and the insulating and heat-insulating component in Embodiment 1 of the present invention. Figure 4 This is a top view of the arc-extinguishing chamber in Embodiment 1 of the present invention; Figure 5 for Figure 4 A cross-sectional view from the perspective of AA; Figure 6This is a schematic diagram of the grid sheet structure in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the arc-extinguishing chamber in Embodiment 2 of the present invention; Figure 8 This is a top view of the arc-extinguishing chamber in Embodiment 2 of the present invention; Figure 9 for Figure 8 A cross-sectional view from the perspective of a BB (Browser). Figure 10 This is a schematic diagram of the arc-extinguishing chamber in Embodiment 3 of the present invention; Figure 11 for Figure 10 A schematic diagram of the insulating and heat-insulating components in the diagram.

[0019] Icons: 110 - Grille; 111 - Body; 1111 - Slot; 1112 - Raised edge; 1113 - Accommodation space; 112 - Leg; 113 - Groove; 120-Side panel; 130 - Insulating and heat-insulating component; 131 - First plate; 132 - Second plate; 133 - Third plate; 140 - Arc-starting channel; 150 - Insulating element; 151 - Encased cavity; 152 - First sidewall. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Example 1 This invention provides an arc-extinguishing chamber, which is applied to a circuit breaker. The arc-extinguishing chamber is used to extinguish the electric arc generated during circuit breaking and to suppress arc reignition, ensuring safe circuit disconnection. Figures 1 to 6As shown, the arc-extinguishing chamber includes: a plurality of grid plates 110 arranged sequentially at intervals and two insulating heat-insulating components 130. Each grid plate 110 includes a main body 111 and two legs 112. The two legs 112 are spaced apart on the main body 111, and a slot 113 is formed between the two legs 112. The slots 113 of each grid plate 110 together form an arc-ignition channel 140. When the circuit breaker breaks, the generated arc is introduced into the arc-ignition channel 140 under the action of electromagnetic force, and is then divided into multiple short arcs in series by the grid plates 110, ensuring that the arc is extinguished quickly and reliably. The extending direction of the insulating heat insulation member 130 is the same as the extending direction of the arc-starting channel 140; two insulating heat insulation members 130 are spaced apart in the arc-starting channel 140 along the width direction of the arc-starting channel 140 and located on both sides of the extending direction of the arc-starting channel 140. The first insulating heat insulation member 130 is located near the first leg 112 of the grid plate 110, and the second insulating heat insulation member 130 is located near the second leg 112 of the grid plate 110. The insulating member 150 is provided with a covering cavity 151; one end of the leg 112 of the grid plate 110 facing away from the main body 111 is inserted into the covering cavity 151; the covering cavity 151 has a first sidewall 152 located in the arc-starting channel 140; the lower end of the first sidewall 152 is spaced apart from the bottom of the arc-starting channel 140; and preferably, the distance D between the lower end of the first sidewall 152 and the bottom of the arc-starting channel 140 is greater than or equal to 2 mm. The upper end of the insulating and heat-insulating member 130 extends to the inner wall of the covering cavity 151, specifically located between the inner side of the leg 112 of the grid plate 110 and the inner wall of the covering cavity 151. The inner side of the leg 112 of the grid plate 110 is the side of one leg 112 facing the other leg 112; in this embodiment, the up and down directions are... Figure 5 The up and down directions in the middle.

[0028] In this embodiment, an effective thermal barrier is formed by providing insulating and heat-insulating components 130 on both sides of the arc-ignition channel 140 extending in the direction of extension and adjacent to the legs 112 of each grid plate 110. The upper end of the insulating and heat-insulating component 130 extends between the inner side of the leg 112 of the grid plate 110 and the inner wall of the covering cavity 151, which greatly reduces the heat entering the insulating component 150 through heat conduction. This ensures that the insulating component 150 can be maintained at a relatively low operating temperature, thereby completely avoiding the risk of the insulating component 150 overheating and melting due to being too close to or attached to the body 111 of the grid plate 110, thus blocking the arc-ignition channel 140. This provides a fundamental guarantee for the reliable interruption of the arc-extinguishing chamber under high voltage and high current conditions and greatly improves the service life of key components inside the circuit breaker. Meanwhile, the lower end of the first sidewall 152 is spaced apart from the bottom of the arc-starting channel 140, with the spacing preferably greater than or equal to 2 mm. This creates an isolation barrier between the lower end of the first sidewall 152 and the bottom of the arc-starting channel 140, cutting off the direct heat conduction path between the lower end of the first sidewall 152 and the grid plate 110, significantly reducing the heat load on the insulating component 150. This thermal isolation fundamentally prevents the insulating component 150 from softening, melting, or deforming due to excessive heating, ensuring the unobstructed flow of the arc-starting channel 140, and guaranteeing that the insulating component 150 can operate stably under controlled conditions. This significantly improves the reliability and service life of the arc-extinguishing chamber when interrupting high-energy arcs.

[0029] In the optional implementation of this embodiment, such as Figures 3 to 6 As shown, each grid plate 110 body 111 is also provided with a slot 1111 corresponding to one of the two insulating heat insulation components 130; preferably, the slot 1111 is located adjacent to the leg 112 of each grid plate 110. The lower end of the insulating heat insulation component 130 is inserted into the corresponding slot 1111. The slot 1111 cooperates with the insulating heat insulation component 130 to allow the insulating heat insulation component 130 to be inserted and fixed, with high positioning accuracy and strong reliability, effectively preventing the insulating heat insulation component 130 from shifting under vibration or airflow impact. Moreover, since the insulating heat insulation component 130 is mechanically fixed by the grid plate 110 itself, redundant fixing components can be eliminated, improving the space utilization rate inside the arc extinguishing chamber, thus providing more space for the core arc extinguishing structure such as the arc ignition channel 140 and grid plate 110 within the same volume of the circuit breaker.

[0030] Furthermore, in this embodiment, as Figure 6As shown, each leg 112 is provided with a protruding edge 1112 that mates with the slot 1111. The protruding edge 1112 is preferably located directly above the corresponding slot 1111, restricting the vertical movement of the insulating and heat-insulating member 130. The protruding edge 1112 and the slot 1111 together form a receiving space 1113, in which the insulating and heat-insulating member 130 is inserted. The receiving space 1113 formed between the slot 1111, the protruding edge 1112 and the inner wall of the covering cavity 151 is more complete, thereby enabling the insulating and heat-insulating member 130 to be placed more stably and accurately.

[0031] In an optional embodiment of this invention, the insulating and heat-insulating component 130 is preferably red steel cardboard. Red steel cardboard is an industrial processing paperboard made by special treatment of base paper with zinc chloride solution. It has excellent electrical insulation properties, high temperature resistance, and low thermal conductivity, which can effectively block the heat transfer from the electric arc to the insulating component 150. In addition, as a rigid board material made of fiber, red steel cardboard can maintain good shape stability and mechanical strength at high temperatures and is not easy to become brittle or pulverized, thus ensuring that the insulating and heat-insulating component 130 can maintain a fixed shape and position during long-term use and has high reliability. Moreover, from a manufacturing point of view, red steel cardboard is easy to perform mechanical processing such as stamping and cutting, and can be easily and cost-effectively made into the required shape and accurately inserted into the slot 1111 of the grid plate 110, thereby achieving simple installation without additional fasteners, greatly optimizing the assembly process and reducing production costs. It should be noted that the insulating and heat-insulating component 130 can be tightly fitted with the slot 1111, so that the insulating and heat-insulating component 130 is installed securely. The insulating and heat-insulating component 130 can also be loosely inserted into the slot 1111, and can move around in the slot 1111, which facilitates the installation of the insulating and heat-insulating component 130. In other alternative embodiments, the insulating and heat-insulating component 130 can also be made of mica board or ceramic material, such as alumina ceramic, silicon nitride ceramic or aluminum nitride ceramic, all of which can meet the insulation and high temperature resistance requirements of this embodiment.

[0032] In an optional embodiment of this invention, the outline shape of the cross-section of the covering cavity 151 is parallel to the outline shape of the leg 112. On the one hand, this allows the insulating and heat-insulating component 130 to be stably and accurately placed between the inner wall of the leg 112 and the inner wall of the covering cavity 151, avoiding local compression or excessive gaps, thereby ensuring the uniformity and reliability of the heat insulation and insulation performance of the insulating and heat-insulating component 130. On the other hand, when the metal of the leg 112 transfers heat to the inner wall of the covering cavity 151, the heat flow distribution will be more uniform, effectively avoiding local heat accumulation caused by mismatch in outline.

[0033] In an optional embodiment of this example, the insulating element 150 may also be configured to have a gas-generating function.

[0034] In the optional implementation of this embodiment, such as Figures 1 to 4 As shown, the arc-extinguishing chamber also includes two opposing and spaced-apart side plates 120; a plurality of grid plates 110 are arranged between the two side plates 120 along the extending direction of the side plates 120, and the side plates 120 provide a base for fixing the grid plates 110. Each side plate 120 has a corresponding insertion hole for the grid plate 110, and the grid plate 110 is inserted into the corresponding insertion hole through the protrusion on its side. Furthermore, in this embodiment, the insulating member 150 is also fixedly disposed on both sides of the two side plates 120. Specifically, each side plate 120 has a slot, and the insulating member 150 has buckles on both sides, and the insulating member 150 is fixed to the side plate 120 by engaging with the slots through the buckles. That is, the arc-extinguishing chamber has formed a stable structure through the cooperation of the side plates 120, the grid plates 110 and the insulating member 150.

[0035] Example 2 The difference between this embodiment and Embodiment 1 is that the location of the insulating and heat-insulating component 130 is different in Embodiment 1. Specifically, as shown... Figures 7 to 9 As shown, the insulating member 150 is provided with a covering cavity 151; the end of the leg 112 of the grid plate 110 facing away from the main body 111 is inserted into the covering cavity 151; the covering cavity 151 has a first sidewall 152 located within the arc-starting channel 140; the lower end of the insulating and heat-insulating member 130 is inserted into the slot 1111 of the main body 111 of the grid plate 110, wherein the first sidewall 152 is located on the side of the insulating and heat-insulating member 130 facing away from another insulating and heat-insulating member 130, so that the insulating and heat-insulating member 130 can separate the arc-starting channel 140 from the leg 112 and at least part of the insulating member 150. In this embodiment, the up and down directions are... Figure 7 The up and down directions in the middle.

[0036] In this embodiment, the insulating heat insulation component 130 separates at least a portion of the first sidewall 152 of the insulating component 150 and the leg 112 of the grid plate 110 from the arc-starting channel 140, significantly reducing the transfer of heat from the grid plate 110 to the body of the insulating component 150. This protects the insulating component 150 from softening, melting, or excessive decomposition due to overheating, thus maintaining its structural integrity and the stability of its gas generation performance. On the other hand, it also prevents the formation of molten material and blockage of the arc-starting channel 140. At the same time, the insulating heat insulation component 130 also provides reliable electrical isolation, enhancing the overall insulation safety.

[0037] In an optional embodiment of this invention, the lower end of the first sidewall 152 is spaced apart from the bottom of the arc-starting channel 140; and preferably, the distance D between the lower end of the first sidewall 152 and the bottom of the arc-starting channel 140 is greater than or equal to 2 mm.

[0038] By spacing the lower end of the first sidewall 152 from the bottom of the arc-starting channel 140 by a distance greater than or equal to 2 mm, an isolation barrier is formed between the lower end of the first sidewall 152 and the bottom of the arc-starting channel 140. This cuts off the direct heat conduction path between the lower end of the first sidewall 152 and the grid plate 110, significantly reducing the heat load on the insulating component 150. This thermal isolation fundamentally prevents the insulating component 150 from softening, melting, or deforming due to excessive heating, ensuring the unobstructed flow of the arc-starting channel 140. It also ensures that the insulating component 150 can operate stably under controlled conditions, thereby significantly improving the reliability and service life of the arc-extinguishing chamber when interrupting high-energy arcs.

[0039] Alternatively, in an optional implementation of this embodiment, such as Figure 9 As shown, the lower end of the first sidewall 152 is in contact with the bottom of the arc-starting channel 140, or the lower end of the first sidewall 152 is spaced apart from the bottom of the arc-starting channel 140, and the distance between the lower end of the first sidewall 152 and the bottom of the arc-starting channel 140 is less than or equal to 2mm.

[0040] In this embodiment, under the action of the insulating and heat-insulating member 130, at least a portion of the first sidewall 152 of the insulating member 150 and the leg 112 of the grid plate 110 are separated from the arc-starting channel 140, reducing the transfer of heat from the grid plate 110 to the body of the insulating member 150, thereby protecting the insulating member 150 from softening, melting or excessive decomposition due to overheating, thus maintaining its structural integrity and the stability of its gas generation performance. Therefore, in this embodiment, the lower end of the first sidewall 152 can contact or be close to the bottom of the arc-starting channel 140, and the insulating member 150 will not be damaged during use.

[0041] In an optional embodiment of this invention, the outline shape of the cross-section of the covering cavity 151 is parallel to the outline shape of the leg 112. In this way, when the metal of the leg 112 transfers heat to the inner wall of the covering cavity 151, the heat flow distribution is more uniform, effectively avoiding local heat accumulation caused by mismatch in outline.

[0042] like Figure 9 As shown, in this embodiment, the insulating heat insulation member 130 separates the arc-starting channel 140 from the bottom portion of the insulating member 150 near the arc-starting channel 140.

[0043] When the insulating heat insulation component 130 partially separates the arc-starting channel 140 from the insulating component 150, a groove matching the overlapping portion of the insulating component 150 can also be provided on the first side wall 152. The insulating component 150 is fitted into the groove, so that the portion of the first side wall 152 exposed in the arc-starting channel 140 is flush with the surface of the insulating component 150 exposed in the arc-starting channel 140.

[0044] In this embodiment, when the insulating heat insulation member 130 partially separates the arc-starting channel 140 from the insulating member 150, the insulating member 150 can also be configured to have a gas-generating function.

[0045] When the insulating heat insulation component 130 completely separates the arc-starting channel 140 from the insulating component 150, for example, when the upper end of the insulating heat insulation component 130 is flush with the end face of the insulating component 150 away from the slot 113, the insulating component 150 can also be a non-gas-generating component.

[0046] Example 3 The difference between this embodiment and Embodiment 1 is that the structure of the insulating and heat-insulating component 130 is different from that in Embodiment 1. The arc-extinguishing chamber provided in this embodiment, such as... Figure 10 and Figure 11 As shown, the arc-extinguishing chamber includes: an insulating component 150, a plurality of sequentially spaced grid plates 110, and two insulating and heat-insulating components 130. Each grid plate 110 includes a main body 111 and two legs 112, which are spaced apart on the main body 111. A slot 113 is formed between the two legs 112, and the slots 113 of each grid plate 110 together form an arc-ignition channel 140. When the circuit breaker trips, the generated arc is introduced into the arc-ignition channel 140 under the action of electromagnetic force, and is subsequently divided into multiple short arcs in series by the grid plates 110, ensuring that the arc is extinguished quickly and reliably. The extending direction of the insulating heat insulation element 130 is the same as the extending direction of the arc-starting channel 140. Two insulating heat insulation elements 130 are spaced apart within the arc-starting channel 140 along its width direction and located on both sides of the extending direction of the arc-starting channel 140. The first insulating heat insulation element 130 is positioned close to the first leg 112 of the grid plate 110 and covers the first leg 112 of the grid plate 110. The second insulating heat insulation element 130 is positioned close to the second leg 112 of the grid plate 110 and covers the second leg 112 of the grid plate 110. Each grid plate 110 body 111 is also provided with a slot 1111 corresponding to each of the two insulating heat insulation elements 130. Preferably, the slot 1111 is positioned adjacent to the leg 112 of each grid plate 110. The two insulating heat insulation elements 130 are respectively inserted into and fixed within their corresponding slots 1111.

[0047] In this embodiment, the legs 112 of the grid plate 110 are separated from the insulator 150 by the insulating heat insulation component 130, forming an effective thermal physical barrier. This greatly reduces the heat entering the insulator 150 through heat conduction, ensuring that the insulator 150 can be maintained at a relatively low operating temperature. This completely avoids the risk of the insulator 150 being too close to or attached to the main body 111 of the grid plate 110, causing it to overheat and melt and block the arc ignition channel 140. This provides a fundamental guarantee for the reliable disconnection of the arc extinguishing chamber under high voltage and high current conditions, and greatly improves the service life of key components inside the circuit breaker.

[0048] Furthermore, in this embodiment, the insulating and heat-insulating member 130 includes a first plate 131, a second plate 132, and a third plate 133; the first plate 131 and the second plate 132 are disposed opposite to each other, the lower end of the first plate 131 is inserted into the slot 1111, and the two ends of the third plate 133 are respectively connected to the upper ends of the first plate 131 and the upper ends of the second plate 132. Thus, the first plate 131, the second plate 132, and the third plate 133 together form a covering groove, and the legs 112 of the grid plate 110 are accommodated within the covering groove formed by the first plate 131, the second plate 132, and the third plate 133. An insulating member 150 is disposed on the outside of the insulating and heat-insulating member 130, such as... Figure 1 As shown, the legs 112 of the grid 110 are lower than the slots on the side plate 120. After the insulating and heat-insulating member 130 covers the legs of the grid 110, the slots are higher than the legs 112 of the grid 110 and the insulating and heat-insulating member 130. Figure 2 As shown, the insulating component 150 has a snap-fit, which engages with the slot to fix the insulating component 150 in the arc-extinguishing chamber. The slot 1111 engages with the insulating and heat-insulating component 130 to allow the insulating and heat-insulating component 130 to be inserted and fixed, with high positioning accuracy and strong reliability, effectively preventing the insulating and heat-insulating component 130 from shifting under vibration or airflow impact. Moreover, since the insulating and heat-insulating component 130 is mechanically fixed using the structure of the grid plate 110 itself, redundant fixing components can be eliminated, improving the space utilization rate inside the arc-extinguishing chamber. Thus, within the same volume of circuit breaker, more space can be provided for the core arc-extinguishing structure such as the arc-starting channel 140 and the grid plate 110. The legs 112 of the grid plate 110 are accommodated in the covering groove formed by the first plate 131, the second plate 132, and the third plate 133, thereby ensuring that the upper part of the insulating component 150 can be maintained at a relatively low operating temperature.

[0049] In this embodiment, the insulating and heat-insulating component 130 is preferably red steel paperboard. Red steel paperboard is an industrial processing paperboard made by special treatment of base paper with zinc chloride solution. It has excellent electrical insulation properties, high temperature resistance, and low thermal conductivity, which can effectively block the heat transfer from the electric arc to the insulating component 150. In addition, as a rigid board material made of fiber, red steel paperboard can maintain good shape stability and mechanical strength at high temperatures and is not easy to become brittle or pulverized. This ensures that the insulating and heat-insulating component 130 can maintain a fixed shape and position during long-term use, resulting in high reliability. From a manufacturing perspective, red steel paperboard is easy to process by stamping, cutting, and other machining. It can be easily and cost-effectively made into the required shape and accurately inserted into the slot 1111 of the grid plate 110. This achieves a simple and stable installation without additional fasteners, greatly optimizing the assembly process and reducing production costs.

[0050] In other alternative embodiments, the insulating and heat-insulating component 130 can also be made of mica board or ceramic material, such as alumina ceramic, silicon nitride ceramic or aluminum nitride ceramic, all of which can meet the insulation and high temperature resistance requirements of this embodiment.

[0051] In an optional embodiment of this application, the positional relationship between the lower end of the first sidewall 152 and the bottom of the arc-inducing channel 140 can be set with reference to Embodiment 2, and therefore will not be repeated here.

[0052] Example 4 This embodiment provides a circuit breaker, including the arc-extinguishing chamber described in any of the above embodiments.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. An arc-extinguishing chamber, characterized in that, The arc-extinguishing chamber includes: an insulating component (150), a plurality of grid plates (110) arranged at intervals in sequence, and two insulating and heat-insulating components (130). The grid plate (110) includes a main body (111) and two legs (112). The two legs (112) are spaced apart on the main body (111), and a slot (113) is formed between the two legs (112). The slots (113) of each grid plate (110) together form an arc-drawing channel (140). The extension direction of the insulating heat insulation member (130) is the same as the extension direction of the arc-starting channel (140); the two insulating heat insulation members (130) are spaced apart on both sides of the extension direction of the arc-starting channel (140), and the two insulating heat insulation members (130) are respectively close to the two legs (112) of each of the grid plates (110). The insulating member (150) is provided with a covering cavity (151), the covering cavity (151) has a first sidewall (152) located in the arc-starting channel (140), one end of the leg (112) away from the main body (111) is inserted into the covering cavity (151), the lower end of the first sidewall (152) is spaced apart from the bottom of the arc-starting channel (140); the upper end of the insulating and heat-insulating member (130) extends to the inner wall of the covering cavity (151); or, the insulating and heat-insulating member (130) covers the leg (112), and the insulating member (150) is covered by the covering cavity (151) on the outside of the insulating and heat-insulating member (130).

2. The arc-extinguishing chamber according to claim 1, characterized in that, The distance between the lower end of the first sidewall (152) and the bottom of the arc-drawing channel (140) is greater than or equal to 2 mm.

3. The arc-extinguishing chamber according to claim 1, characterized in that, The main body (111) is provided with two slots (1111) that correspond one-to-one with the insulating and heat-insulating component (130); the lower end of the insulating and heat-insulating component (130) is inserted into the corresponding slot (1111).

4. The arc-extinguishing chamber according to claim 3, characterized in that, When the upper end of the insulating heat insulation member (130) extends to the inner wall of the covering cavity (151), each of the legs (112) is provided with a protruding edge (1112) that mates with the slot (1111). The protruding edge (1112) and the slot (1111) together form a receiving space (1113), and the insulating heat insulation member (130) is inserted into the receiving space (1113).

5. The arc-extinguishing chamber according to claim 3, characterized in that, When the insulating heat insulation component (130) covers the leg (112), the insulating heat insulation component (130) includes a first plate (131), a second plate (132) and a third plate (133); the first plate (131) and the second plate (132) are arranged opposite to each other, the two ends of the third plate (133) are respectively connected to the upper end of the first plate (131) and the upper end of the second plate (132), and the lower end of the first plate (131) is inserted into the corresponding slot (1111); the leg (112) of the grid plate (110) is inserted between the first plate (131), the second plate (132) and the third plate (133).

6. The arc-extinguishing chamber according to any one of claims 1 to 5, characterized in that, The insulating and heat-insulating component (130) is red steel paperboard.

7. The arc-extinguishing chamber according to any one of claims 1 to 5, characterized in that, The arc-extinguishing chamber also includes two side plates (120); the two side plates (120) are arranged opposite each other and spaced apart, and a plurality of grid plates (110) are spaced apart between the two side plates (120) along the extension direction of the side plates (120).

8. The arc-extinguishing chamber according to claim 7, characterized in that, The insulating component (150) is fixedly mounted on the two side plates (120) on both sides.

9. The arc-extinguishing chamber according to claim 8, characterized in that, The side plate (120) is provided with a slot, and the insulating component (150) is provided with a buckle. The insulating component (150) is fixed to the slot by the buckle.

10. A circuit breaker, characterized in that, It includes the arc-extinguishing chamber as described in any one of claims 1 to 7, or the arc-extinguishing chamber as described in claim 8 or 9.

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