Circuit breaker

Abstract

A circuit breaker comprises a contact system and an arc extinguish chamber, the arc extinguish chamber is provided with at least one partition plate in an area between the separation position of a moving contact and a static contact and the inner side of an arc extinguish grid plate group, and the at least one partition plate divides the area into at least two different arc channels; a gap exists between the at least one partition plate and the end face, close to the arc extinguish chamber, of the moving contact. In the circuit breaker, at least one partition plate can divide the space below the inner side of the arc extinguishing grid sheet group into two cavities so as to compress the electric arc and ensure that the electric arc can enter the arc extinguishing grid sheets. Meanwhile, by utilizing the same volume in the arc extinguish chamber, the arc extinguish grid plates are made into an L shape, the arc extinguish grid plates are fully arranged, and meanwhile, two layers of deionization structures are arranged to gradually block and deionize the arc, so that the purposes of arc extinguish and zero flashover can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage switch technology, specifically relating to a circuit breaker. Background Technology

[0002] In the current low-voltage circuit breaker field, AC switches can withstand up to AC1140V. According to the latest low-voltage electrical appliance industry standards, AC switches will be able to withstand current and voltage up to AC2000V and DC3000V. Existing traditional products can no longer meet these requirements. Especially in the wind power industry, where the system voltage has increased from AC1140V to AC2000V, a higher arc voltage is needed to extinguish the arc. However, in traditional arc-extinguishing chambers, the arc-extinguishing grids are placed in parallel, leaving no space to accommodate more arc-extinguishing grids. For example... Figure 1 As shown, in the prior art, the electric arc generated by the moving and stationary contacts in the casing is blown into the arc-extinguishing chamber, where the arc-extinguishing grid cuts the arc. Simultaneously, the enormous energy generated causes the arc distance to increase dramatically, and a large arc distance reduces the safety of the distribution cabinet. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing frame circuit breakers, such as the difficulty in achieving sufficient arc voltage and zero arc flash in the arrangement of arc-extinguishing grid plates in the arc-extinguishing chamber. This invention provides a circuit breaker that improves the arc voltage by changing the contact system, arc-extinguishing chamber, and pin ionization structure, thereby enhancing the arc-extinguishing capability of the arc-extinguishing chamber and achieving zero arc flash.

[0004] Technical solution

[0005] To achieve the above technical objectives, this utility model provides a circuit breaker, comprising a contact system and an arc-extinguishing chamber. The arc generated by the contact system enters the arc-extinguishing chamber and is cut by an arc-extinguishing grid assembly within the chamber. The contact system includes moving contacts and stationary contacts. The moving contact includes at least two moving contact pieces arranged side-by-side. Moving main contacts and moving arc contacts are arranged at corresponding positions on the at least two side-by-side moving contact pieces. Stationary contacts and stationary arc contacts are arranged on the stationary contact at positions corresponding to the moving main contacts and moving arc contacts on the moving contact pieces. The circuit breaker is characterized by:

[0006] The arc-extinguishing chamber has at least one partition plate arranged in the area between the separation position of the moving contact and the stationary contact and the inner side of the arc-extinguishing grid plate group, and the at least one partition plate divides the area into at least two different arc channels.

[0007] There is a gap between the at least one partition and the end face of the moving contact near the arc-extinguishing chamber.

[0008] In one embodiment, the arc-extinguishing grid assembly includes a transverse arc-extinguishing grid assembly and a longitudinal arc-extinguishing grid assembly. The transverse and longitudinal arc-extinguishing grid assemblies form a multi-grid arc-extinguishing grid assembly to achieve the same space for arranging more arc-extinguishing grids. The transverse and longitudinal arc-extinguishing grid assemblies form an L-shape. The transverse arc-extinguishing grid assembly is located above the longitudinal arc-extinguishing grid assembly, and the longitudinal arc-extinguishing grid assembly is located on the moving contact side of the contact system.

[0009] The arc-extinguishing grid plates in the transverse arc-extinguishing grid plate group gradually become inclined as they move from the end furthest from the moving contact in the contact system to the end closest to the moving contact;

[0010] The second arc-extinguishing grid in the longitudinal arc-extinguishing grid group is arranged at an angle and corresponds to the first arc-extinguishing grid in the transverse arc-extinguishing grid group.

[0011] In one embodiment, the de-ionization structure is arranged outside the exhaust port of the arc extinguishing chamber. The de-ionization structure includes a first de-ionization layer and a second de-ionization layer. The first de-ionization layer is used to block the flying free arc, and the second de-ionization layer extinguishes the arc overflowing from the first de-ionization layer to achieve zero flying arc.

[0012] In one embodiment, the first de-free layer is composed of several inclined protruding plates, and a first air passage is provided between the several inclined protruding plates. The inlet of the first air passage is opposite to the exhaust port of the arc-extinguishing chamber. The second de-free layer is composed of several stacked perforated plates.

[0013] In one embodiment, the number of perforated plates is 3 to 5 layers.

[0014] In one embodiment, the stationary main contact on the stationary contact head corresponds one-to-one with the corresponding moving main contact on the moving contact piece, and no stationary arc contact is arranged at the positions corresponding to the moving arc contact on both sides of the stationary contact head and the moving arc contact on the moving contact piece.

[0015] In one embodiment, the arc-extinguishing chamber is provided with a partition in the middle of the region between the separation position of the moving contact and the stationary contact and the inner side of the arc-extinguishing grid assembly, which can divide the space below the inner side of the arc-extinguishing grid assembly into two chambers to compress the electric arc.

[0016] In one embodiment, the gas generating element is mounted on the side of the arc-extinguishing grid assembly facing the moving contact.

[0017] In one embodiment, the gas-generating element has a V-shaped structure to ensure that the arc generated on the moving contact plate flows into the arc-extinguishing grid plate group.

[0018] In one embodiment, the arc-extinguishing grid assembly includes a moving contact arc-inducing plate, with the moving contact located outside the arc-extinguishing grid assembly.

[0019] Beneficial effects

[0020] This utility model provides a circuit breaker comprising a contact system and an arc-extinguishing chamber. The electric arc generated by the contact system enters the arc-extinguishing chamber and is cut by an arc-extinguishing grid assembly within the chamber. The contact system includes moving contacts and stationary contacts. The moving contact includes at least two moving contact pieces arranged side-by-side, with moving main contacts and moving arc contacts arranged at corresponding positions on these pieces. The stationary contact has stationary main contacts and stationary arc contacts arranged at positions corresponding to the moving main contacts and moving arc contacts on the moving contact pieces. At least one partition is arranged in the arc-extinguishing chamber from the separation point between the moving and stationary contacts to the inner side of the arc-extinguishing grid assembly, dividing this area into at least two different arc channels. A gap exists between the at least one partition and the end face of the moving contact near the arc-extinguishing chamber. In this circuit breaker, at least one partition can divide the space below the inner side of the arc-extinguishing grid assembly into two chambers, thereby compressing the arc and ensuring that the arc can enter the arc-extinguishing grid. Meanwhile, using the same volume within the arc-extinguishing chamber, the arc-extinguishing grid is made into an "L" shape, with the grid fully arranged. At the same time, two layers of deionization structure are set up to gradually block and deionize the arc, thus achieving the purpose of both extinguishing the arc and eliminating arc flash. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Appendix Figure 1 This is a schematic diagram of the structure of a circuit breaker in the prior art;

[0023] Appendix Figure 2 This is a schematic diagram of the circuit breaker in an embodiment of this utility model;

[0024] Appendix Figure 3 This is a schematic diagram of the internal structure of the circuit breaker in an embodiment of this utility model;

[0025] Appendix Figure 4 This is a schematic diagram of the moving contact structure in an embodiment of this utility model;

[0026] Appendix Figure 5 This is a schematic diagram of the stationary contact structure in an embodiment of this utility model;

[0027] Appendix Figure 6 This is a schematic diagram showing the positions of the contacts and the arc-extinguishing chamber in an embodiment of this utility model;

[0028] Appendix Figure 7 This is a schematic diagram of the arc-extinguishing grid assembly and the deionization structure in an embodiment of this utility model; Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0034] Example

[0035] like Figure 1 As shown, in the prior art, the electric arc generated by the moving and stationary contacts in the casing is blown into the arc-extinguishing chamber, where the arc-extinguishing grid cuts the arc. Simultaneously, the enormous energy generated causes the arc distance to increase dramatically, and a large arc distance reduces the safety of the distribution cabinet.

[0036] To solve this problem, see attached... Figure 2 and 3 As shown, this embodiment provides a circuit breaker, which includes a contact system a, an arc-extinguishing chamber b, and an anti-ionization structure c. The arc generated by the contact system a enters the arc-extinguishing chamber b, is cut by the arc-extinguishing grid assembly b01 inside the arc-extinguishing chamber b, and is discharged from the arc-extinguishing chamber b. After being discharged from the arc-extinguishing chamber b, the arc-extinguishing structure c performs anti-ionization treatment on the free arc overflowing from the arc-extinguishing chamber b, ultimately achieving zero arcing. The arc-extinguishing grid assembly b01 includes a transverse arc-extinguishing grid assembly b0101 and a longitudinal arc-extinguishing grid assembly b0102. The transverse arc-extinguishing grid assembly b0101... The arc-extinguishing grid plate group b0101 and the longitudinal arc-extinguishing grid plate group b0102 constitute a multi-grid arc-extinguishing grid plate group b01, enabling more arc-extinguishing grid plates to be arranged in the same space. In this embodiment, the transverse arc-extinguishing grid plate group b0101 and the longitudinal arc-extinguishing grid plate group b0102 form an L-shape. Specifically, the transverse arc-extinguishing grid plate group b0101 is located above the longitudinal arc-extinguishing grid plate group b0102, and the longitudinal arc-extinguishing grid plate group b0102 is located on one side of the moving contact a01 in the contact system a. The arc-extinguishing grid plates b0101a in the transverse arc-extinguishing grid plate group b0101 gradually tilt from a vertical arrangement to an inclined arrangement as they move from the end away from the moving contact a01 in the contact system a towards the end closer to the moving contact a01. The arc-extinguishing grid plate two b0102a in the longitudinal arc-extinguishing grid plate group b0102 is arranged at an angle and corresponds to the arc-extinguishing grid plate one b0101a in the transverse arc-extinguishing grid plate group b0101. By setting the arc-extinguishing chamber grid plates in an "L" shape, more arc-extinguishing grid plates can be arranged in the same volume to achieve a high arc voltage.

[0037] like Figure 2As shown in Figures 3 and 7, the de-ionization structure c is arranged outside the exhaust port of the arc-extinguishing chamber b. The de-ionization structure c includes a first de-ionization layer c01 and a second de-ionization layer c02. The first de-ionization layer c01 is used to block the flying free arc, and the second de-ionization layer c02 extinguishes the arc overflowing from the first de-ionization layer c01 to achieve zero flying arc. In this embodiment, the first de-ionization layer c01 is composed of several inclined protruding plates c0101. A first air passage c0102 is provided between the several inclined protruding plates c0101, and the inlet of the first air passage c0102 is opposite to the exhaust port of the arc-extinguishing chamber b. The second de-ionization layer c02 is a several stacked perforated plates. In this embodiment, the number of perforated plates is preferably 3 to 5 layers. This structure uses several tilted protruding plates (c0101) to block part of the arc that flies out directly, and then uses a perforated plate to block the arc layer by layer, but not completely seal it, so as to achieve the purpose of both venting and zero arcing.

[0038] The contact system a includes a moving contact a01 and a stationary contact a02, such as Figure 4 As shown, the moving contact a01 includes at least two moving contact pieces a0101 arranged side by side. Moving main contact a0101a and moving arc contact a0101b are arranged at corresponding positions on the at least two moving contact pieces a0101 arranged side by side. Figure 5 As shown, stationary contact a02a and stationary arc contact a02b are arranged on the stationary contact a02 at positions corresponding to the moving main contact a0101a and moving arc contact a0101b on the moving contact a0101. The stationary main contact a02a on the stationary contact a02 corresponds one-to-one with the corresponding moving main contact a0101a on the moving contact a0101. No stationary arc contact a02b is arranged at positions a02c on the stationary contact a02 corresponding to the moving arc contact a0101b on the moving contact a0101. In the stationary contact section, the stationary arc contact only exists in the middle. Short circuits mainly burn the moving main contacts; the stationary arc contact does not need to be fully filled. Moreover, due to timing considerations, the middle arc contact is separated later, which helps concentrate the arc in the middle.

[0039] At least one partition plate b02 is arranged in the area between the separation position of the moving contact a01 and the stationary contact a02 and the inner side of the arc-extinguishing grid assembly b01 in the arc-extinguishing chamber b. The partition plate b02 divides this area into at least two different arc channels n,n'. A gap m exists between the partition plate b02 and the end face of the moving contact a01 near the arc-extinguishing chamber b. The gap m facilitates assembly, does not affect the movement of the moving contact a01, and also achieves the effect of a narrow slit. At the same time, the gap m can also allow gas to flow inside the two different arc channels n,n'. When there is a pressure difference between the two different arc channels n,n', the gas in the arc channel with higher pressure can flow through the gap m to the arc channel with lower pressure, balancing the pressure inside the arc channels n,n' and preventing the intermediate partition plate 3 from tilting.

[0040] like Figure 6 As shown, the arc-extinguishing chamber b has a partition b02 arranged in the middle of the area between the separation position of the moving contact a01 and the stationary contact a02 and the inner side of the arc-extinguishing grid assembly b01. This partition divides the space below the inner side of the arc-extinguishing grid assembly b01 into two chambers, thereby compressing the arc and ensuring that the arc can enter the arc-extinguishing grid. The partition b02 can be a single partition or at least two partitions arranged side-by-side, dividing the space below the inner side of the arc-extinguishing grid assembly b01 into two chambers. When the synchronicity of the moving contact a01 is good, arcs are generated at both moving contacts a01 on both sides of the partition b02, and the arcs enter the grid through two channels. When the synchronicity of the moving contacts is poor, an arc is generated at the moving contact a01 on one side of the partition b02, and the arc enters the grid through one corresponding channel. Thus, because the arc column is compressed, the arc voltage is increased.

[0041] The arc-extinguishing grid assembly b01 includes a moving contact arc-initiating plate b01a, with the moving contact a01 located outside the arc-extinguishing grid assembly b01. A gas-generating component b03 is mounted on the side of the arc-extinguishing grid assembly b01 facing the moving contact a01. The gas-generating component b03 has a V-shaped structure to ensure that the arc generated on the moving contact piece a0101 converges into the arc-extinguishing grid assembly b01. Furthermore, when the stationary contact a02 is not equipped with a stationary arc contact a02b at positions a02c corresponding to the moving arc contact a0101b on the moving contact piece a0101, the V-shaped structure of the gas-generating component b03 ensures that the arc generated on the moving contact piece a0101 in the middle portion of the moving contact a01 converges into the arc-extinguishing grid assembly b01.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A circuit breaker comprising a contact system (a) and an arc chamber (b), an arc generated by the contact system (a) entering the arc chamber (b) is cut by an arc cutting grid set (b01) in the arc chamber (b), the contact system (a) comprising a moving contact (a01) and a stationary contact (a02), the moving contact (a01) comprising at least two moving contact pieces (a0101) arranged side by side, the at least two moving contact pieces (a0101) being provided with a moving main contact point (a0101a) and a moving arc contact point (a0101b) at corresponding positions, the stationary contact (a02) being provided with a stationary main contact point (a02a) and a stationary arc contact point (a02b) at corresponding positions to the moving main contact point (a0101a) and the moving arc contact point (a0101b) on the moving contact pieces (a0101), characterized in that: the arc chamber (b) is provided with at least one partition (b02) between a region from a position where the moving contact (a01) and the stationary contact (a02) are separated to an inside of the arc cutting grid set (b01), the at least one partition (b02) dividing the region into at least two different arc channels (n, n’); there is a gap (m) between the at least one partition (b02) and an end surface of the moving contact (a01) close to the arc chamber (b); the arc cutting grid set (b01) comprises a transverse arc cutting grid set (b0101) and a longitudinal arc cutting grid set (b0102), the transverse arc cutting grid set (b0101) and the longitudinal arc cutting grid set (b0102) constitute a multi-grid arc cutting grid set (b01) to achieve the same spatial arrangement of more arc cutting grids, the transverse arc cutting grid set (b0101) and the longitudinal arc cutting grid set (b0102) constitute an L shape, the transverse arc cutting grid set (b0101) is located at an upper portion of the longitudinal arc cutting grid set (b0102), and the longitudinal arc cutting grid set (b0102) is located at a side of the moving contact (a01) in the contact system (a); an arc cutting grid one (b0101a) in the transverse arc cutting grid set (b0101) is gradually arranged in an inclined manner from a vertical arrangement from an end far away from the moving contact (a01) in the contact system (a) to an end close to the moving contact (a01); an arc cutting grid two (b0102a) in the longitudinal arc cutting grid set (b0102) is arranged in an inclined manner corresponding to the arc cutting grid one (b0101a) in the transverse arc cutting grid set (b0101); and a de-ionization structure (c) is arranged outside an exhaust port of the arc chamber (b), the de-ionization structure (c) comprising a first de-ionization layer (c01) for blocking flying ionized arcs and a second de-ionization layer (c02) for extinguishing arcs overflowing from the first de-ionization layer (c01) to achieve zero flying arcs. ​ ​ 2. A circuit breaker according to claim 1, wherein: ​ ​ ​ 3. A circuit breaker as claimed in claim 1, wherein: ​ 4. A circuit breaker as claimed in claim 3, wherein: The first deionization layer (c01) is composed of a plurality of inclined convex plates (c0101), and a first air passage (c0102) is arranged between the plurality of inclined convex plates (c0101), the inlet of the first air passage (c0102) is opposite to the exhaust port of the arc extinguishing chamber (b), and the second deionization layer (c02) is a plurality of stacked mesh plates.

5. A circuit breaker as claimed in claim 4, wherein: The number of the mesh plates is 3-5 layers.

6. The circuit breaker of claim 1, wherein: The static main contact points (a02a) on the static contact (a02) correspond to the corresponding dynamic main contact points (a0101a) on the dynamic contact piece (a0101) one by one, and the positions corresponding to the two sides of the dynamic arc contact points (a0101b) on the dynamic contact piece (a0101) on the static contact (a02) are not arranged with static arc contact points (a02b).

7. The circuit breaker of claim 1, wherein: The arc extinguishing chamber (b) is arranged with a partition plate (b02) in the middle of the region between the position where the dynamic contact (a01) and the static contact (a02) are separated and the inside of the arc extinguishing grid piece group (b01), so as to compress the arc into two chambers.

8. The circuit breaker of claim 1, wherein: The gas production member (b03) is arranged on the side of the arc extinguishing grid piece group (b01) facing the dynamic contact (a01).

9. A circuit breaker as claimed in claim 8, wherein: The gas production member (b03) is a v-shaped structure to ensure that the arc generated on the dynamic contact piece (a0101) converges into the arc extinguishing grid piece group (b01).

10. The circuit breaker of claim 1, wherein: The arc extinguishing grid piece group (b01) includes a dynamic contact arc plate (b01a), and the dynamic contact (a01) is located outside the arc extinguishing grid piece group (b01).

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