Arc extinguish chamber and circuit breaker

Abstract

The utility model provides an arc extinguish chamber and a circuit breaker, and relates to the technical field of electrical equipment. The arc extinguish chamber comprises a first side plate, a second side plate, a grid plate group, a gas production block and an inner partition plate. The first side plate and the second side plate are opposite in position and arranged at intervals. The grid piece group comprises a plurality of arc extinguishing grid pieces arranged at intervals, the arc extinguishing grid pieces are located between the first side plate and the second side plate and installed on the first side plate and the second side plate, and the grid piece group comprises an opening side. And the gas generating blocks are inserted into gaps among different arc extinguishing grid sheets. The inner partition plate is arranged on the opening side and provided with a channel for the moving contact to move. According to the invention, the gas generation block is arranged in the gap, and the gas generation block can generate gas under the action of high temperature generated by the arc, thereby increasing the atmospheric pressure in the arc extinguish chamber, facilitating the acceleration of the outward discharge of the gas in the arc extinguish chamber, improving the arc extinguish efficiency of the arc extinguish chamber, reducing the possibility of the damage of the arc to components in the circuit breaker, such as a contact, and improving the reliability of the circuit breaker. And the breaking capacity of the circuit breaker can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to an arc extinguishing chamber and a circuit breaker. Background Art

[0002] Circuit breakers are important switching devices in power organizations, which can close, carry and disconnect current in the circuit. When overload, short circuit and other faults occur in the system, the circuit breaker can cut off the circuit by opening the gate to prevent the fault from expanding.

[0003] When the circuit breaker is opened, an arc will be generated between the moving contact and the stationary contact. The circuit breaker is usually provided with an arc extinguishing chamber, through which the arc can be transferred and extinguished. However, the arc extinguishing efficiency of the arc extinguishing chamber in the related art is not high, and there is a possibility that the arc will damage the contacts, which is not conducive to improving the breaking capacity of the circuit breaker. Utility Model Content

[0004] The present application provides an arc extinguishing chamber and a circuit breaker, which can improve the arc extinguishing efficiency of the arc extinguishing chamber, reduce the possibility of damage to contacts caused by the arc, and facilitate improving the breaking capacity of the circuit breaker.

[0005] In a first aspect, the present application provides an arc extinguishing chamber, which is applied to a circuit breaker, and the circuit breaker includes a moving contact. The arc extinguishing chamber includes a first side plate, a second side plate, a grid group, a gas generating block and an inner partition. The first side plate and the second side plate are positioned relative to each other and are spaced apart. The grid group includes a plurality of arc extinguishing grids spaced apart, the plurality of arc extinguishing grids are located between the first side plate and the second side plate, and are installed on the first side plate and the second side plate, and the grid group includes an opening side. The gas generating block is inserted into the gap between different arc extinguishing grids. The inner partition is arranged on the opening side, and the inner partition is provided with a channel for the moving contact to move.

[0006] By arranging a gas-generating block in the gap formed between a plurality of arc-extinguishing grids arranged at intervals, the gas-generating block can generate gas under the high temperature generated by the electric arc, thereby increasing the atmospheric pressure in the arc-extinguishing chamber. In this way, on the one hand, the generated gas can accelerate the flow of the arc to the arc-extinguishing grid, so that the arc-extinguishing grid extinguishes the arc, thereby improving the arc-extinguishing efficiency of the arc-extinguishing chamber. On the other hand, the atmospheric pressure in the arc-extinguishing chamber increases, so that a large pressure difference is formed inside and outside the arc-extinguishing chamber, which facilitates the acceleration of the gas in the arc-extinguishing chamber to be discharged to the outside. In the process of the gas in the arc-extinguishing chamber being discharged to the outside, the heat generated by the arc can be effectively taken away to cool and extinguish the arc, thereby reducing the damage to components such as contacts in the circuit breaker, which is beneficial to improving the breaking capacity of the circuit breaker.

[0007] In a possible design, the gas generating block includes a connecting portion and a plurality of extending portions, the plurality of extending portions are connected to the same side of the connecting portion, and the plurality of extending portions are arranged at intervals. The connecting portion is located at the opening side, the plurality of extending portions are located in the gap, and the plurality of extending portions are interspersed with the plurality of arc extinguishing grids.

[0008] Through the above solution, multiple protruding portions can be inserted between multiple arc extinguishing grid plates. The multiple protruding portions are located in the gaps between different arc extinguishing grid plates, so that the multiple protruding portions can generate gas under the high temperature of the arc in the arc extinguishing chamber, thereby accelerating the flow of the arc towards the arc extinguishing grid plates to extinguish the arc, and accelerating the discharge of the gas in the arc extinguishing chamber to the outside to carry away the heat generated by the arc.

[0009] In a possible design, the grid plate group includes an arc outlet side, and the arc outlet side is opposite to the opening side in position. A guiding inclined surface is provided at one end of the protruding portion close to the arc outlet side, and the guiding inclined surface is used to guide the gas in the arc extinguishing chamber to flow outside the arc extinguishing chamber.

[0010] Through the above solution, it can play a guiding role in the outward flow of the gas in the arc extinguishing chamber, and can increase the space for the gas to flow in the arc extinguishing chamber from the opening side to the arc outlet side. In this way, the air pressure in the arc extinguishing chamber can be easily released from the arc outlet side, and a negative pressure is formed in the arc extinguishing chamber. Thus, it can accelerate the flow of the high-pressure gas in the arc extinguishing chamber to the outside of the arc extinguishing chamber, and can accelerate the movement of the arc towards the arc extinguishing grid plates, improving the arc extinguishing efficiency of the arc extinguishing chamber and playing a key role in improving the breaking capacity of the circuit breaker.

[0011] In a possible design, the number of gaps is equal to the number of protruding portions, and one protruding portion is inserted into each gap.

[0012] Through the above solution, the protruding portions can be distributed among all adjacent arc extinguishing grid plates. In this way, the number of protruding portions accommodated in the arc extinguishing chamber is relatively large, so that the gas generating block can generate more gas, which is convenient for better playing the role of the gas generating block.

[0013] In a possible design, the arc extinguishing grid plate includes a first segment, a connecting segment, and a second segment connected in sequence. The first segment and the second segment are arranged at intervals, and an opening of the arc extinguishing grid plate is formed between the first segment and the second segment. The side where the opening is located is the opening side. The first segment is installed on the first side plate, and the second segment is installed on the second side plate. The gap includes a first gap and a second gap. A first gap is formed between two adjacent first segments, and a second gap is formed between two adjacent second segments. Protruding portions are inserted into both the first gap and the second gap.

[0014] Through the above solution, the protruding portions can have more insertion positions, which is convenient for setting the number of protruding portions to be relatively large. In this way, the number of protruding portions accommodated in the arc extinguishing chamber is relatively large. Not only can the protruding portions in the first gap generate gas, but also the protruding portions in the second gap can generate gas, which is convenient for better playing the role of the gas generating block.

[0015] In a possible design, on at least one side of the protruding portion and the arc extinguishing grid plate in the arrangement direction of the multiple arc extinguishing grid plates, there is a surface contact.

[0016] Through the above solution, a large contact area is provided between the protruding part and the arc extinguishing grid. In this way, the heat on the arc extinguishing grid is easily transferred to the protruding part through the large contact surface, making it easy for the protruding part to generate gas when heated, so as to increase the atmospheric pressure in the arc extinguishing chamber, and thus facilitate improving the arc extinguishing efficiency of the arc extinguishing chamber and the breaking capacity of the circuit breaker based on the same principle as before.

[0017] In a possible design, the first side plate is in contact with the protruding part located in the first gap. The second side plate is in contact with the protruding part located in the second gap.

[0018] By the first side plate being in contact with the protruding part located in the first gap, the first side plate can limit the protruding part in the first gap on the side where the first segment is far from the second segment, reducing the possibility of the protruding part in the first gap moving away from the second segment. By the second side plate being in contact with the protruding part located in the second gap, the second side plate can limit the protruding part in the second gap on the side where the second segment is far from the first segment, reducing the possibility of the protruding part in the second gap moving away from the first segment.

[0019] In a possible design, the inner partition includes a first partition and a second partition that are opposite in position and spaced apart, and a channel is formed between the first partition and the second partition. The first partition is located on the side of the first segment close to the second segment, and the first partition is in contact with the protruding part located in the first gap. The second partition is located on the side of the second segment close to the first segment, and the second partition is in contact with the protruding part located in the second gap.

[0020] By arranging the first partition to be in contact with the protruding part located in the first gap, the first partition can limit the protruding part in the first gap on the side where the first segment is close to the second segment, reducing the possibility of the protruding part in the first gap moving towards the second segment. By arranging the second partition to be in contact with the protruding part located in the second gap, the second partition can limit the protruding part in the second gap on the side where the second segment is close to the first segment, reducing the possibility of the protruding part in the second gap moving towards the first segment.

[0021] In a possible design, the gas generating block is made of a thermoplastic plastic material.

[0022] Through the above solution, the gas generating block is more likely to decompose under the high temperature of the arc, so that more gas can be generated, which helps to cool the arc and extinguish the arc during the arc extinguishing process.

[0023] In a second aspect, the present application provides a circuit breaker, including the arc extinguishing chamber in the first aspect.

[0024] For the circuit breaker provided in the second aspect and each possible design of the second aspect, the beneficial effects can be referred to the beneficial effects brought by the first aspect and each possible implementation manner of the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a partial structural schematic diagram of a circuit breaker provided by an embodiment of the present application.

[0026] Figure 2 is Figure 1 Schematic diagram after hiding part of the structure.

[0027] Figure 3 FIG. is a combined structural schematic diagram of an arc extinguishing chamber provided by an embodiment of the present application from a perspective.

[0028] Figure 4 FIG. is an exploded view of an arc extinguishing chamber provided by an embodiment of the present application.

[0029] Figure 5 FIG. is a structural schematic diagram of a gas generating block provided by an embodiment of the present application.

[0030] Figure 6 FIG. is a structural schematic diagram of an inner partition provided by an embodiment of the present application.

[0031] DESCRIPTION OF REFERENCE NUMERALS:

[0032] 100, static contact;

[0033] 200, arc extinguishing chamber; 210, arc extinguishing grid; 211, opening side; 212, opening; 213, arc outlet side; 214, first segment; 215, connecting segment; 216, second segment; 220, first side plate; 230, second side plate; 240, gas generating block; 241, connecting portion; 242, protruding portion; 2421, guiding inclined surface; 250, inner partition; 251, channel; 252, first partition; 253, second partition. DETAILED DESCRIPTION

[0034] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the description of the application herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the drawings are intended to cover non-exclusive inclusion.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase "embodiments" appearing in various places in the specification is not necessarily referring to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] The term "and / or" herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0038] The orientation terms appearing in the following description are all the directions shown in the figures and do not specifically limit the structure of the current limiting module of this application. For example, in the description of this application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0039] In addition, the terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0040] In the description of this application, unless otherwise specified, the meaning of "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups).

[0041] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, the "connection" or "coupling" of mechanical structures may refer to a physical connection. For example, a physical connection may be a fixed connection, such as a fixed connection through a spacer, such as a fixed connection through screws, bolts, or other spacers; a physical connection may also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection may also be an integral connection, such as a connection formed by welding, bonding, or integral molding. 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.

[0042] As a key structural component of a circuit breaker, the arc extinguishing chamber plays an important role in the process of interrupting short-circuit current. The structural design of the arc extinguishing chamber has always been a key concern in the design and development of circuit breakers.

[0043] Generally, the arc extinguishing chamber includes two side plates opposite to each other and a plurality of arc extinguishing grids arranged at intervals. The plurality of arc extinguishing grids are located between the two side plates and fixedly installed on the two side plates. The arc generated when the circuit breaker opens can be transferred and extinguished through the arc extinguishing chamber. In the related art, in order to improve the arc extinguishing efficiency of the arc extinguishing chamber, the side plates for fixing the arc extinguishing grids are made of thermoplastic materials.

[0044] Although using thermoplastic materials to make the side plates enables the side plates to have a gas generation function, under the condition that the side plates have a gas generation function, higher requirements are put forward for the high-temperature resistance characteristics of the side plates. The main reasons are as follows: The miniaturization of the circuit breaker makes the internal space of the arc extinguishing chamber limited, so the distance between the two side plates is relatively close. In this way, once there is an arc in the arc extinguishing chamber, the high temperature generated by the arc is likely to cause irreversible damage to the two side plates, such as burning or severe deformation, which will lead to the failure of the breaking test of the circuit breaker and affect the use performance of the circuit breaker.

[0045] In view of this, the present application provides an arc extinguishing chamber and a circuit breaker to improve the arc extinguishing efficiency of the arc extinguishing chamber.

[0046] Figure 1 It is a partial structural schematic diagram of a circuit breaker provided by an embodiment of the present application. Figure 2 is Figure 1 a schematic diagram after hiding some structures, as Figure 1 and Figure 2 shown, the present application provides a circuit breaker, which includes a housing (not shown in the figure), a moving contact (not shown in the figure), a static contact 100, and an arc extinguishing chamber 200.

[0047] The housing includes a base and an upper cover that cover each other. The moving contact, the static contact 100, and the arc extinguishing chamber 200 are all located in the space formed between the mutually covered base and the upper cover.

[0048] The arc extinguishing chamber 200 usually has a plurality of arc extinguishing grid plates 210. The static contact 100 is arranged at the bottom of the arc extinguishing chamber 200 along the arrangement direction of the plurality of arc extinguishing grid plates 210. One end of the moving contact for cooperating with the static contact 100 can extend into the arc extinguishing chamber 200 and can move within the arc extinguishing chamber 200 so as to approach and contact the static contact 100, or move away from and separate from the static contact 100.

[0049] Among them, the bottom of the arc extinguishing chamber 200 refers to the part of the arc extinguishing chamber 200 close to the base.

[0050] The structure of the arc extinguishing chamber 200 will be introduced in detail below with reference to the accompanying drawings.

[0051] Figure 3 It is a schematic diagram of the combined structure of an arc extinguishing chamber provided by an embodiment of the present application from a perspective. Figure 4 It is an exploded view of an arc extinguishing chamber provided by an embodiment of the present application. Combining Figures 1 to 4 , the arc extinguishing chamber 200 may include a first side plate 220, a second side plate 230, a grid plate group, a gas generating block 240, and an inner partition 250.

[0052] The first side plate 220 and the second side plate 230 are opposite in position and arranged at intervals. The grid plate group includes a plurality of arc extinguishing grid plates 210 arranged at intervals. The plurality of arc extinguishing grid plates 210 are located between the first side plate 220 and the second side plate 230 and are installed on the first side plate 220 and the second side plate 230. The grid plate group includes an opening side 211. The gas generating block 240 is inserted into the gap between different arc extinguishing grid plates 210. The inner partition 250 is arranged at the opening side 211, and the inner partition 250 is provided with a channel 251 for the movement of the moving contact.

[0053] The structures of the first side plate 220 and the second side plate 230 may be the same. The first side plate 220 and the second side plate 230 are arranged at intervals, so a space for arranging a plurality of arc extinguishing grid plates 210 can be formed between the first side plate 220 and the second side plate 230. Among them, the plurality of arc extinguishing grid plates 210 can be arranged at intervals according to a certain rule between the first side plate 220 and the second side plate 230.

[0054] The plurality of arc extinguishing grid plates 210 are located in the space formed between the first side plate 220 and the second side plate 230, and the plurality of arc extinguishing grid plates 210 can be installed on the first side plate 220 and the second side plate 230 by means of riveting or plugging.

[0055] Each arc extinguishing grid piece 210 has an opening 212. When a plurality of arc extinguishing grid pieces 210 are installed on the first side plate 220 and the second side plate 230, the openings 212 face the same direction, and the side where the openings 212 of the plurality of arc extinguishing grid pieces 210 are located is the opening side 211 of the grid piece group.

[0056] The gas generating block 240 can be a structure of any shape, and the material of the gas generating block 240 can be made of any thermoplastic material, as long as the gas generating block 240 can generate gas under the action of the high temperature generated by the arc, so that the gas can accelerate the flow of the arc towards the arc extinguishing grid piece 210 and facilitate the discharge of the gas in the arc extinguishing chamber 200. The embodiments of the present application do not limit the shape and material of the gas generating block 240, etc. Exemplarily, the material of the gas generating block 240 can be nylon.

[0057] The gas generating block 240 can include a toothed structure so that the gas generating block 240 can be inserted into the gap between different arc extinguishing grid pieces 210. Among them, the gas generating block 240 can be partially inserted into the gap between the arc extinguishing grid pieces 210 or can be completely inserted into the gap between the arc extinguishing grid pieces 210. The embodiments of the present application do not limit this. The gas generating block 240 is inserted into the gap between different arc extinguishing grid pieces 210. In this way, the position of the gas generating block 240 can be restricted to a certain extent by the arc extinguishing grid pieces 210.

[0058] In the case where the gas generating block 240 can generate gas, the first side plate 220 and the second side plate 230 in the present application do not necessarily need to be made of thermoplastic material. On the contrary, the first side plate 220 and the second side plate 230 can be made of thermosetting material. In this way, the possibility of damage to the first side plate 220 and the second side plate 230 caused by the high temperature generated by the arc can be reduced.

[0059] The inner partition plate 250 is generally located at the opening side 211. The inner partition plate 250 is provided with a channel 251, and the channel 251 communicates with the aforementioned opening 212. The end of the moving contact can extend into the aforementioned opening 212 through the channel 251 and can move along the channel 251 to contact or separate from the static contact 100. The width of the channel 251 can be slightly larger than the thickness of the moving contact. In this way, not only can it ensure the normal movement of the moving contact along the channel 251, but also the wall of the channel 251 can provide a limiting effect on the moving contact, reducing the possibility of the moving contact being deflected during movement.

[0060] The inner partition plate 250 can be made of thermosetting material. The size of the opening side 211 is usually small. Making the inner partition plate 250 of thermosetting material can reduce the possibility of the inner partition plate 250 melting and deforming due to the influence of the heat of the arc, which is convenient for improving the service life of the inner partition plate 250.

[0061] In the embodiment of the present application, a gas generating block 240 is provided in the gap formed between a plurality of arc extinguishing grids 210 arranged at intervals. The gas generating block 240 can generate gas under the high temperature generated by the electric arc, thereby increasing the atmospheric pressure in the arc extinguishing chamber 200. In this way, on the one hand, the generated gas can accelerate the flow of the arc to the arc extinguishing grid 210, so that the arc extinguishing grid 210 extinguishes the arc, thereby improving the arc extinguishing efficiency of the arc extinguishing chamber 200. On the other hand, the atmospheric pressure in the arc extinguishing chamber 200 increases, so that a large pressure difference is formed inside and outside the arc extinguishing chamber 200, so that it is convenient to accelerate the gas in the arc extinguishing chamber 200 to be discharged outwardly. In the process of the gas in the arc extinguishing chamber 200 being discharged outwardly, the heat generated by the arc can be effectively taken away to cool and extinguish the arc, thereby reducing the damage to components such as contacts in the circuit breaker, which is conducive to improving the breaking capacity of the circuit breaker.

[0062] In addition, a gas generating block 240 is provided in the gap between the arc extinguishing grids 210. Compared with the related art, the gas generating block 240 in the present application can replace the first side plate 220 and the second side plate 230 to generate gas. Therefore, the first side plate 220 and the second side plate 230 do not need to generate gas and can be made of thermosetting materials. In this way, the possibility of the first side plate 220 and the second side plate 230 being burned by the arc can be reduced.

[0063] Furthermore, the inner partition 250 is arranged on the opening side 211, which can not only limit the movement of the moving contact and reduce the possibility of the moving contact being deflected when moving along the channel 251, but also provide a limiting effect for the gas producing block 240 to a certain extent, thereby reducing the possibility of the gas producing block 240 moving toward the opening side 211 and escaping from the gap between the arc extinguishing grids 210.

[0064] The gas production block 240 may have various structures. For example, in some possible designs, the gas production block 240 may be formed by setting a plurality of blind grooves on a solid cubic structure. The plurality of blind grooves are arranged at intervals, and the structure between two adjacent blind grooves forms the aforementioned tooth-like structure.

[0065] In some other possible designs, different from the above-mentioned designs, the gas production block 240 can also be formed by setting a plurality of through grooves on a solid cubic structure. Figure 5 A schematic diagram of the structure of a gas production block 240 provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the gas generating block 240 may include a connecting portion 241 and a plurality of extending portions 242, wherein the plurality of extending portions 242 are connected to the same side of the connecting portion 241 and the plurality of extending portions 242 are arranged at intervals. Figures 2 to 5 The connecting portion 241 is located at the opening side 211 , the plurality of protruding portions 242 are located in the gap, and the plurality of protruding portions 242 and the plurality of arc-extinguishing grids 210 are interspersed.

[0066] The connecting portion 241 and the extending portion 242 may both be plate-shaped structures, and may be formed separately and then assembled, or may be formed in one piece, which is not limited in the present embodiment.

[0067] The plurality of extensions 242 are connected to the same side of the connection portion 241 , and the plurality of extensions 242 are arranged at intervals, so that the gas generating block 240 has a comb-like structure. In this way, the gas generating block 240 can be easily inserted into the gap between the arc extinguishing grids 210 .

[0068] The grid group includes an arc-out side 213, which is opposite to the opening side 211, and is used for allowing the gas in the arc-extinguishing chamber 200 to flow out. The gas generating block 240 can move toward the arc-extinguishing grid 210 along the direction from the opening side 211 to the arc-out side 213 until the plurality of extensions 242 are inserted into the gaps between different arc-extinguishing grids 210. At this time, the connection part 241 for connecting the plurality of extensions 242 remains on the opening side 211 of the grid group, and the connection part 241 can abut against the portion of the arc-extinguishing grid 210 close to the opening side 211.

[0069] There is a gap between two adjacent arc-extinguishing grids 210, and there is a gap between two adjacent extensions 242. In addition, the gap between two adjacent extensions 242 can be greater than the thickness of the arc-extinguishing grid 210, and the thickness of the extension 242 can be less than the gap between two adjacent arc-extinguishing grids 210, so that the extension 242 can be smoothly inserted into the gap between the arc-extinguishing grids 210.

[0070] The interlaced arrangement of the plurality of extensions 242 and the plurality of arc-extinguishing grids 210 means that, in the region where the arc-extinguishing grids 210 with the extensions 242 are located, the extensions 242 and the arc-extinguishing grids 210 are alternately arranged. In other words, in this region, one extension 242 is arranged between two arc-extinguishing grids 210, and one arc-extinguishing grid 210 is arranged between two extensions 242.

[0071] This embodiment provides a possible structural form of a gas generating block 240, wherein a plurality of extensions 242 are connected to the same side of a connecting portion 241, and the plurality of extensions 242 are arranged at intervals, so that the plurality of extensions 242 can be inserted between a plurality of arc extinguishing grids 210. The plurality of extensions 242 are located in the gaps between different arc extinguishing grids 210, so that the plurality of extensions 242 can generate gas under the high temperature of the arc in the arc extinguishing chamber 200, thereby accelerating the arc to flow toward the arc extinguishing grid 210 to extinguish the arc, and accelerating the gas in the arc extinguishing chamber 200 to be discharged to the outside to take away the heat generated by the arc.

[0072] The above only illustrates two possible structural forms of the gas production block 240 , but does not constitute a limitation on the structural form of the gas production block 240 .

[0073] Based on the above description, there is a gap between each adjacent arc-extinguishing grid 210, and a plurality of spaced-apart extensions 242 are connected to the same side of the connecting portion 241. In some possible designs, the number of gaps may be equal to the number of extensions 242, and one extension 242 is inserted into each gap.

[0074] For example, assuming that there are 10 arc-extinguishing grids 210, there are 9 gaps between different adjacent arc-extinguishing grids 210. In this case, there may be 9 protruding portions 242. The 9 protruding portions 242 correspond to the 9 gaps one by one, and the 9 protruding portions 242 can be inserted into the corresponding gaps.

[0075] The number of gaps is set equal to the number of protruding portions 242, and one protruding portion 242 is inserted into each gap, so that the protruding portions 242 can be distributed between all two adjacent arc-extinguishing grids 210. In this way, the number of protruding portions 242 accommodated in the arc-extinguishing chamber 200 is large, so that the gas generating block 240 can generate more gas, so as to better play the role of the gas generating block 240.

[0076] For the specific position of the extension portion 242 in the gap, please continue to refer to Figure 1 , Figure 2 and Figure 4 In some embodiments, the arc extinguishing grid 210 includes a first segment 214, a connecting segment 215, and a second segment 216 connected in sequence, the first segment 214 and the second segment 216 are arranged at intervals, and an opening 212 of the arc extinguishing grid 210 is formed between the first segment 214 and the second segment 216, and the side where the opening 212 is located is an opening side 211.

[0077] The first segment 214 is mounted on the first side plate 220, and the second segment 216 is mounted on the second side plate 230. The gap includes a first gap and a second gap, wherein the first gap is formed between two adjacent first segments 214, and the second gap is formed between two adjacent second segments 216. The first gap and the second gap are both inserted with the extension 242.

[0078] The first segment 214, the connecting segment 215 and the second segment 216 can be integrally formed to form the arc extinguishing grid 210, so as to save the assembly process of the arc extinguishing grid 210. The opening 212 between the first segment 214 and the second segment 216 is equivalent to the notch of the groove formed on the arc extinguishing grid 210, and the connecting segment 215 is equivalent to the bottom of the groove. The first segment 214 and the second segment 216 will induce a strong magnetic field when breaking the short circuit and interrupting the current, and the magnetic field can attract the arc to the bottom of the groove, so that the arc is cut by the connecting segment 215 of the plurality of arc extinguishing grids 210 to achieve the purpose of arc extinguishing.

[0079] The first side plate 220 is arranged close to the first segment 214, facilitating the installation of the first segment 214 on the first side plate 220 by means such as riveting and plugging. The second side plate 230 is arranged close to the second segment 216, facilitating the installation of the second segment 216 on the second side plate 230 by means such as riveting and plugging.

[0080] Suppose the gap formed between two adjacent first segments 214 is called the first gap, the gap formed between two adjacent second segments 216 is called the second gap, and the gap formed between two adjacent connection segments 215 is called the third gap. Since the connection segment 215 is arranged close to the arc outlet side 213, the third gap needs to provide an outlet for the gas flow out in the arc extinguishing chamber 200, so it is not convenient to plug the protruding part 242 in the third gap.

[0081] However, since the first segment 214 and the second segment 216 are arranged at intervals, the first gap and the second gap are also spaced from each other. Plugging the protruding part 242 into the first gap and the second gap, the protruding part 242 in the first gap will not contact the protruding part 242 in the second gap. In this way, the insertion of the protruding part 242 will not affect the normal movement of the moving contact, nor will it affect the gas in the arc extinguishing chamber 200 flowing out through the arc outlet side 213. Therefore, in this application, the protruding part 242 is plugged into the first gap and the second gap.

[0082] The protruding part 242 is plugged into both the first gap and the second gap, so that the protruding part 242 can have more plugging positions, facilitating the setting of a larger number of protruding parts 242. In this way, a larger number of protruding parts 242 are accommodated in the arc extinguishing chamber 200. Gas can be generated not only by the protruding part 242 in the first gap but also by the protruding part 242 in the second gap, facilitating the better play of the role of the gas generating block 240.

[0083] Please continue to refer to Figure 2 and Figure 5 , in some embodiments, a guiding inclined surface 2421 can be provided at one end of the protruding part 242 close to the arc outlet side 213, and the guiding inclined surface 2421 is used to guide the gas in the arc extinguishing chamber 200 to flow out of the arc extinguishing chamber 200.

[0084] Whether it is the protruding part 242 in the first gap or the protruding part 242 in the second gap, a guiding inclined surface 2421 can be provided. From the perspective of the arc outlet side 213, the guiding inclined surface 2421 provided for the protruding part 242 in the first gap and the guiding inclined surface 2421 provided for the protruding part 242 in the second gap can be in a V shape, or in a trumpet shape.

[0085] A guiding inclined surface 2421 is provided at one end of the protruding portion 242 close to the arc outlet side 213, which can guide the outward flow of the gas in the arc extinguishing chamber 200 and increase the space for gas flow in the arc extinguishing chamber 200 from the opening side 211 to the arc outlet side 213. In this way, the air pressure in the arc extinguishing chamber 200 can easily be released from the arc outlet side 213, and a negative pressure is formed in the arc extinguishing chamber 200. Thus, the high-pressure gas in the arc extinguishing chamber 200 can be accelerated to flow out of the arc extinguishing chamber 200, and the arc can be accelerated to move towards the arc extinguishing grid 210, improving the arc extinguishing efficiency of the arc extinguishing chamber 200 and playing a key role in improving the breaking capacity of the circuit breaker.

[0086] On the premise that the protruding portion 242 is located in the gap, in some embodiments, in combination with Figure 2 and Figure 5 , on the arrangement direction of the plurality of arc extinguishing grids 210, at least one side of the protruding portion 242 is in surface contact with the arc extinguishing grid 210.

[0087] The protruding portion 242 includes a first side and a second side opposite to each other in the arrangement direction of the arc extinguishing grids 210. The first side can be in surface contact with one arc extinguishing grid 210, and the second side can be in surface contact with another arc extinguishing grid 210.

[0088] Through the above-mentioned surface contact setting, a large contact area is formed between the protruding portion 242 and the arc extinguishing grid 210. In this way, the heat on the arc extinguishing grid 210 is easily transferred to the protruding portion 242 through the large contact surface, making the protruding portion 242 easily generate gas by heating, so as to increase the atmospheric pressure in the arc extinguishing chamber 200, and thus it is convenient to improve the arc extinguishing efficiency of the arc extinguishing chamber 200 and the breaking capacity of the circuit breaker based on the same principle as before.

[0089] Based on the foregoing description, the protruding portion 242 can be inserted into both the first gap of the first segment 214 and the second gap of the second segment 216. The first segment 214 is installed on the first side plate 220, and the second segment 216 is installed on the second side plate 230. In some embodiments, the first side plate 220 can be in contact with the protruding portion 242 located in the first gap, and the second side plate 230 can be in contact with the protruding portion 242 located in the second gap.

[0090] The first side plate 220 is in contact with the protruding portion 242 located in the first gap, so that the first side plate 220 can limit the protruding portion 242 in the first gap on the side of the first segment 214 away from the second segment 216, reducing the possibility of the protruding portion 242 in the first gap moving away from the second segment 216.

[0091] Similarly, the second side plate 230 contacts the protruding portion 242 located in the second gap, so that the second side plate 230 can limit the protruding portion 242 in the second gap on the side where the second segment 216 is away from the first segment 214, reducing the possibility that the protruding portion 242 in the second gap moves away from the first segment 214.

[0092] In addition to the first side plate 220 and the second side plate 230 being able to limit the protruding portion 242, the present application can also limit the protruding portion 242 through the inner partition 250. The following will be combined with Figure 4 and Figure 6 to introduce in detail the manner in which the inner partition 250 limits the protruding portion 242.

[0093] Figure 6 is a schematic structural diagram of an inner partition 250 provided in an embodiment of the present application. Combining Figure 4 and Figure 6 , in some embodiments, the inner partition 250 may include a first partition 252 and a second partition 253 that are relatively positioned and spaced apart, and a channel 251 is formed between the first partition 252 and the second partition 253.

[0094] The channel 251 has been introduced previously and will not be elaborated here.

[0095] The first partition 252 and the second partition 253 are located between the first segment 214 and the second segment 216.

[0096] Specifically, the first partition 252 is located on the side of the first segment 214 close to the second segment 216, or rather, the first partition 252 is arranged close to the first segment 214. At this time, the first partition 252 is arranged to contact the protruding portion 242 located in the first gap, so that the first partition 252 can limit the protruding portion 242 in the first gap on the side where the first segment 214 is close to the second segment 216, reducing the possibility that the protruding portion 242 in the first gap moves towards the second segment 216.

[0097] The second partition 253 is located on the side of the second segment 216 close to the first segment 214, or rather, the second partition 253 is arranged close to the second segment 216. At this time, the second partition 253 is arranged to contact the protruding portion 242 located in the second gap, so that the second partition 253 can limit the protruding portion 242 in the second gap on the side where the second segment 216 is close to the first segment 214, reducing the possibility that the protruding portion 242 in the second gap moves towards the first segment 214.

[0098] Based on the previous embodiments, in some embodiments, the present application can be configured such that the first side plate 220 and the first partition 252 are both in contact with the protruding portion 242 located in the first gap, so as to limit the protruding portion 242 in the first gap on the side of the first segment 214 away from the second segment 216 through the first side plate 220, and at the same time, limit the protruding portion 242 in the first gap on the side of the first segment 214 close to the second segment 216 through the first partition 252.

[0099] In still other embodiments, the present application can be configured such that the second side plate 230 and the second partition 253 are both in contact with the protruding portion 242 located in the second gap, so as to limit the protruding portion 242 in the first gap on the side of the second segment 216 away from the first segment 214 through the second side plate 230, and at the same time, limit the protruding portion 242 in the second gap on the side of the second segment 216 close to the first segment 214 through the second partition 253.

Claims

1. An arc extinguishing chamber, applied to a circuit breaker, the circuit breaker comprising a moving contact, characterized in that: include: a first side plate and a second side plate, wherein the first side plate and the second side plate are opposite to each other and spaced apart; A grid group, comprising a plurality of arc-extinguishing grids arranged at intervals, wherein the plurality of arc-extinguishing grids are located between the first side plate and the second side plate and are installed on the first side plate and the second side plate, and the grid group comprises an open side; A gas generating block is inserted into the gap between the arc extinguishing grids; An inner partition is arranged on the opening side, and the inner partition is provided with a channel for the movable contact to move.

2. The arc extinguishing chamber according to claim 1, characterized in that: The gas production block includes a connecting portion and a plurality of extending portions, wherein the plurality of extending portions are connected to the same side of the connecting portion and the plurality of extending portions are arranged at intervals; The connecting portion is located at the opening side, the plurality of protruding portions are located in the gap, and the plurality of protruding portions and the plurality of arc-extinguishing grids are interlaced.

3. The arc extinguishing chamber according to claim 2, characterized in that: The grid plate group includes an arc-out side, and the arc-out side is opposite to the opening side; A guiding slope is provided at one end of the extending portion close to the arc-exiting side, and the guiding slope is used for guiding the gas in the arc-extinguishing chamber to flow to the outside of the arc-extinguishing chamber.

4. The arc extinguishing chamber according to claim 2, characterized in that: The number of the gaps is equal to the number of the protruding parts, and one protruding part is inserted into each of the gaps.

5. The arc extinguishing chamber according to claim 2, characterized in that: The arc extinguishing grid comprises a first segment, a connecting segment and a second segment connected in sequence, the first segment and the second segment are arranged at an interval, an opening of the arc extinguishing grid is formed between the first segment and the second segment, and the side where the opening is located is the opening side; The first section is mounted on the first side panel, and the second section is mounted on the second side panel; The gap includes a first gap and a second gap, the first gap is formed between two adjacent first segments, and the second gap is formed between two adjacent second segments; The protruding portion is inserted into both the first gap and the second gap.

6. The arc extinguishing chamber according to any one of claims 2 to 5, characterized in that: In the arrangement direction of the plurality of arc-extinguishing grids, at least one side of the protruding portion is in surface contact with a portion between the arc-extinguishing grids.

7. The arc extinguishing chamber according to claim 5, characterized in that: The first side plate is in contact with the extension portion located in the first gap; The second side plate contacts the protruding portion located in the second gap.

8. The arc extinguishing chamber according to claim 5, characterized in that: The inner partition includes a first partition and a second partition that are oppositely positioned and spaced apart, and the channel is formed between the first partition and the second partition; The first partition is located on a side of the first segment close to the second segment, and the first partition is in contact with the protruding portion located in the first gap; The second partition is located on a side of the second segment close to the first segment, and the second partition is in contact with the protruding portion located in the second gap.

9. The arc extinguishing chamber according to claim 1, characterized in that: The gas generating block is made of thermoplastic plastic material.

10. A circuit breaker, characterized in that: The arc extinguishing chamber comprises the arc extinguishing chamber as claimed in any one of claims 1 to 9.

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