Built-in arc extinguishing structure and circuit breaker with built-in arc extinguishing structure

Abstract

The invention discloses a built-in arc extinguishing structure and a circuit breaker with the built-in arc extinguishing structure, the built-in arc extinguishing structure comprises a supporting piece and a grid mesh assembly, the grid mesh assembly is installed in a cavity of the supporting piece, the built-in arc extinguishing structure is formed by the supporting piece and the grid mesh assembly, and the built-in arc extinguishing structure is detachably installed on a base in a circuit breaker body. Compared with the prior art, the built-in arc extinguishing structure has the advantages that the arc extinguishing structure and the circuit breaker body are integrated, so that the requirement of high breaking zero flashover of a product is met, a standard insulation bottom plate is not needed, the size of the product is shortened, the structural design of a cabinet body is greatly optimized, and the design cost of the box transformer cabinet is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to an arc extinguishing structure built-in and a circuit breaker with the arc extinguishing structure. BACKGROUND

[0002] With the vigorous development of new energy in China, the system rated voltage requirement is getting higher and higher, however, with the increase of system voltage, when a large short-circuit current occurs in the system, the circuit breaker will produce a large arc when cutting off the short-circuit current, if the arc is not controlled, it will cause the circuit breaker and the busbar in the cabinet to have a secondary short-circuit, thereby causing the fault to further expand, and eventually burning the cabinet. In order to control the arc to cause adverse effects, a separate zero arc shield is usually added at the inlet end or the safety distance between the circuit breaker and the busbar at the inlet end is increased, each circuit breaker is equipped with a zero arc shield and an insulation bottom plate, however, the above measures will increase the volume of the cabinet, thereby increasing the production cost of the cabinet; and the connection between the external zero arc shield and the body is only connected by a few screws, which is not strong enough to prevent the shield from breaking under a large current breaking.

[0003] As a mature industry, circuit breakers have begun to have high-end development trends, requiring circuit breakers to have high breaking, long life, zero arc, small size, and other characteristics.

[0004] Therefore, the present application provides an arc extinguishing module built-in and a circuit breaker with the same, which discards the traditional external shield, integrates the arc extinguishing module and the circuit breaker body, meets the requirements of high breaking and zero arc, does not need to be equipped with an insulation bottom plate, shortens the volume of the product, greatly optimizes the structural design of the cabinet, and reduces the design cost of the box transformer cabinet. SUMMARY

[0005] The present application aims to provide an arc extinguishing structure built-in to solve the aforementioned problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: The present application provides an arc extinguishing structure built-in, which comprises a support and a grid assembly, the grid assembly is installed in the cavity of the support, and the arc extinguishing structure is composed of the support and the grid assembly, the arc extinguishing structure is detachably installed on the base in the circuit breaker body, the grid assembly comprises a first grid group and a second grid group, the first grid and the second grid group are arranged in an upper and lower manner, and the first grid group and the second grid group each comprise a plurality of first grids, and the adjacent first grids are arranged in an alternating manner with a spacing.

[0007] Further, it further comprises a filter grid, and the filter grid is located between the adjacent first grids.

[0008] Further, the side walls on both sides of the support member are provided with grooves for fixing the grid.

[0009] Further, the first grid comprises a grid body provided with a plurality of mesh holes, and protrusions are further provided on both sides of the grid body and are in interference fit with the grooves.

[0010] Further, one end of the protrusion is connected with the grid body, and the other end of the protrusion is not connected with the grid body, and the protrusion is arranged obliquely.

[0011] Further, the outer surfaces of the side walls on both sides of the support member are further provided with bosses for cooperating with the grooves in the base.

[0012] Further, the third grid group is located at the end away from the arc-extinguishing chamber, and is composed of at least one second grid.

[0013] Further, the support member is further provided with a fixing table at the end away from the arc-extinguishing chamber, and the third grid group is installed on the fixing table.

[0014] Further, a plurality of support tables are further provided in the cavity of the support member, both ends of the support tables are fixed on the inner walls on both sides of the support member, and a spacing is provided between adjacent support tables.

[0015] The application also relates to a circuit breaker with an arc-extinguishing structure.

[0016] The application has the following beneficial effects: The arc-extinguishing structure is built-in, the traditional protective cover is discarded, the arc-extinguishing module is integrated with the circuit breaker body, the product meets the high breaking zero arc requirements, does not need to be equipped with an insulating bottom plate, the product volume is shortened, the cabinet structure design is greatly optimized, and the design cost of the box transformer cabinet is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the arc-extinguishing structure of the application; Figure 2 is a structural schematic view of the support member of the application; Figure 3 is a structural schematic view of the base of the application; Figure 4 is a structural view of the first grid of the application; Figure 5 is a structural view of the ceramic silicon carbide arc-extinguishing grid of the application; Figure 6 is an assembly relationship view of the arc-extinguishing structure and the circuit breaker of the application; Figure 7is a structural schematic diagram of the circuit breaker of the present application; Figure 8 is an arc movement trajectory diagram of the present application.

[0018] Reference signs: Support 1, groove 101, boss 102, fixed table 103, support table 104, base 2, first grid group 3, second grid group 4, first grid 5, mesh 501, protrusion 502, ceramic silicon carbide arc-extinguishing grid 6, third grid group 7, arc-extinguishing chamber 8, one end of which is also provided with a fixed table 103, wiring panel 9, insulating part 10. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0020] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application or simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0021] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0022] The term "exemplary" used herein means "serving as an example, embodiment or illustration". Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments.

[0023] In addition, in order to better illustrate the present application, a large number of specific details are given in the specific embodiments below. Those skilled in the art should understand that the present application can also be implemented without certain specific details. In some examples, methods, means, elements and circuits that are well known to those skilled in the art are not described in detail, in order to highlight the main idea of the present application.

[0024] As Figures 1 to 8As shown, the present application provides a built-in arc extinguishing structure, which comprises a support 1 and a grid assembly, the grid assembly is installed in the cavity of the support 1, and the arc extinguishing structure is formed by the support 1 and the grid assembly, which is a separate module and can be detachably installed on the base 2 in the circuit breaker body. The grid assembly comprises a first grid group 3 and a second grid group 4, the first grid group 3 and the second grid group 4 are arranged in an upper and lower manner, and each of the first grid group 3 and the second grid group 4 is composed of a plurality of first grids 5. Adjacent first grids 5 are arranged in a staggered manner with a spacing, and the first grid group 3 and the second grid group 4 are arranged in a staggered manner with a high one and a low one. Since the first grid group 3 and the second grid group 4 are arranged in an upper and lower structure and a staggered manner with a high one and a low one, the arc extinguishing area of each first grid 5 is increased, which is more conducive to extinguishing arc particles and achieves the effect of zero flying arc. In another embodiment, the first grids can be aligned or staggered left and right to achieve the technical effects of the present application, which is also within the protection scope of the present application.

[0025] As can be seen from the above, since the present application adopts a built-in arc extinguishing structure, the traditional protective cover is discarded, and the arc extinguishing module is integrated with the circuit breaker body to meet the requirements of high breaking and zero flying arc of the product, without the need for standard insulation board, which shortens the volume of the product, greatly optimizes the structural design of the cabinet and reduces the design cost of the box transformer cabinet.

[0026] In the actual demand, in order to meet different breaking capacity, in the production process, the filter grid 6 can be added in the arc extinguishing structure according to different breaking force. In the embodiment, the filter grid can be made of ceramic silicon carbide arc extinguishing grid, and the filter grid 6 is located between adjacent first grids 5, thereby achieving zero flying arc and reducing waste. In actual use, the filter grid can also be made of other filter materials, which is not limited in detail.

[0027] In addition, it should be noted that, as Figure 2 As shown, the side walls on both sides of the support 1 are provided with grooves 101, the grooves 101 are used to fix the first grids 5, the first grids 5 comprise a grid body, a plurality of mesh holes 501 are formed on the grid body, and protrusions 502 are further arranged on both sides of the grid body. The protrusions 502 are in interference fit with the grooves 101. Since the interference fit of the grooves 101 and the protrusions 502 is adopted, the installation is very convenient. In the embodiment, the number of grooves 101 is consistent with the number of first grids 5. In addition, it should be noted that, in order to make the first grids 5 present a staggered arrangement with a high one and a low one, the depth of the grooves 101 also presents a staggered arrangement with a high one and a low one, so that the airflow of the arc in the arc extinguishing module is right Figure 8 up and down like a maze, which increases the arc extinguishing area of each grid and is more conducive to extinguishing arc particles, thereby achieving the effect of zero flying arc.

[0028] Please refer to Figure 4 As shown, one end of the protrusion 502 is connected to the grid body by integral molding, and the other end of the protrusion 502 is not connected to the grid body. The protrusion 502 is inclined. Because the protrusion 502 is inclined, when the protrusion 502 and the groove 101 are engaged, they can be firmly engaged.

[0029] In addition, to install the overall arc suppression structure within the circuit breaker body, please refer to... Figure 2 As shown, the outer surfaces of the two side walls of the support member 1 are also provided with bosses 102. The bosses 102 are connected to the side walls by integral molding. The bosses 102 are used to cooperate with the inner grooves 201 of the base 2 for installation. Due to the cooperation between the bosses 102 and the inner grooves 101, the installation and disassembly of the arc-extinguishing structure are very convenient.

[0030] Additionally, it should be noted that a third grid group 7 is also included. The third grid group 7 is located at the end away from the arc-extinguishing chamber 8. The third grid group 7 consists of at least one second grid. The third grid group can further extinguish arc particles.

[0031] In order to install the third grid, the support member is also provided with a fixed platform 103 at the end away from the arc-extinguishing chamber 8. The third grid 7 group is installed on the fixed platform 103. The fixed platform 103 is connected to the support member 1 by integral molding to ensure that the fixed platform 103 can be connected to the support member 1.

[0032] In addition, it is worth mentioning that, such as Figure 6 As shown, the cavity of the support member 1 is also provided with multiple support platforms 104. The two ends of each support platform 104 are fixed to the inner walls of both sides of the support member 1. When the first grid group 3 and the second grid group 4 are installed on the support member 1, there is a gap between the end of the first grid group 3 near the support platform 104 and the support platform 104, and a gap between the end of the second grid group 4 near the support platform 104 and the support platform 104. There is a spacing between adjacent support platforms 104. Through these gaps and spacings, when the arc generated by the circuit breaker's opening and closing moves from the arc-extinguishing chamber 8 to the arc-extinguishing structure, the airflow direction of the arc within the arc-extinguishing structure is as follows... Figure 8 As shown, the top and bottom are like a maze, increasing the arc-extinguishing area of ​​each grid.

[0033] The present invention also relates to a circuit breaker with a built-in arc suppression structure, including the aforementioned built-in arc suppression structure. The built-in arc suppression structure is detachably installed on the base 2 of the circuit breaker. The arc suppression structure is located on the terminal block. An insulating element 10 is provided between the terminal block 9 and the arc suppression structure. The insulating element 10 prevents the arc from moving towards the terminal block 9, thereby preventing short circuits in the circuit breaker and ensuring safer and more reliable use of the circuit breaker.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A built-in arc-suppression structure, characterized in that, It includes a support member and a grid assembly, the grid assembly being installed in the cavity of the support member, and the support member and the grid assembly forming a built-in arc suppression structure, which is detachably installed on a base inside the circuit breaker body.

2. The built-in arc-suppression structure according to claim 1, characterized in that: The grid assembly includes a first grid group and a second grid group. The first grid group and the second grid group are arranged vertically. Both the first grid group and the second grid group are composed of multiple first grids. There is a gap between adjacent first grids, and they are arranged alternately with one high and one low.

3. The built-in arc-suppression structure according to claim 1, characterized in that: It also includes a filter screen located between adjacent first screens.

4. The built-in arc-suppression structure according to claim 1, characterized in that: The support member has grooves on its side walls on both sides, which are used to fix the grid.

5. The built-in arc-suppression structure according to claim 2, characterized in that: The first grid includes a grid body with multiple mesh openings and protrusions on both sides of the grid body, the protrusions being interference-fitted with the grooves.

6. The built-in arc-suppression structure according to claim 5, characterized in that: One end of the protrusion is connected to the grid body, and the other end of the protrusion is not connected to the grid body. The protrusion is set at an angle.

7. The built-in arc-suppression structure according to claim 6, characterized in that: The outer surfaces of the two side walls of the support member are also provided with bosses, which are used to cooperate with the inner groove of the base for installation.

8. The built-in arc-suppression structure according to claim 7, characterized in that: It also includes a third grid group, which is located at the end away from the arc-extinguishing chamber, and the third grid group consists of at least one second grid.

9. The built-in arc-suppression structure according to claim 1, characterized in that: The support member is also provided with a fixed platform at the end away from the arc-extinguishing chamber, and the third grid group is installed on the fixed platform.

10. A circuit breaker with a built-in arc-suppression structure, characterized in that, Includes the built-in arc suppression structure as described in any one of claims 1-9.

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