Arc extinguishing grid plate, arc extinguishing chamber structure and circuit breaker

Abstract

The invention relates to the technical field of arc extinguishing structures, in particular to an arc extinguishing grid plate, an arc extinguishing chamber structure and a circuit breaker. The arc extinguishing grid sheet provided by the invention comprises a grid sheet substrate, grid sheet legs and a first insulating layer, the grid substrate is used for cutting electric arcs; the grid plate leg is vertical to the grid plate base body, is positioned in the middle of the grid plate base body and forms a T-shaped structure with the grid plate base body; the first insulating layer is arranged on the grid sheet legs and at least wraps part of the grid sheet legs, so that the grid sheet legs can divide the arc running area into two independent arc striking channels. The arc extinguishing grid sheet is of a T-shaped structure, so that after the arc extinguishing grid sheet is installed to form an arc extinguishing chamber, grid sheet legs can extend to a central zone of an arc running area, the first insulating layer plays a role in electrical isolation, and when an electric arc is generated, the arc extinguishing grid sheet of the T-shaped structure is beneficial to strengthening a magnetic field in the center of the arc running area, so that the arc extinguishing effect is improved. The arc can be pulled to the cutting area of the arc extinguishing grid plate more actively and quickly, and the moving efficiency and the arc extinguishing speed of the arc are improved.

Description

Technical Field

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

[0002] To meet the demands of the new energy sector for high-voltage, high-current breaking capacity, the arc-extinguishing performance of circuit breakers is crucial. In existing technologies, to improve current-carrying and arc-extinguishing capabilities, multiple moving contact plates are often combined, resulting in a relatively wide contact system and corresponding arc-extinguishing grid plates. This structure has significant drawbacks: First, in the arc-trapping region, the magnetic field in the central area is weak, making it difficult for the arc to enter the arc-extinguishing grid plates for cutting; second, the narrow-slot arc-extinguishing chamber used to enhance the arc-extinguishing effect typically has a narrow slot width smaller than the stacked width of the moving contact plates. This means that the entrance to the narrow slot channel is often angled towards some of the moving contact plates, further hindering the smooth transfer of the arc into the narrow slot channel, thus affecting breaking efficiency and arc-extinguishing capability. Summary of the Invention

[0003] The purpose of this invention is to provide an arc-extinguishing grid, an arc-extinguishing chamber structure, and a circuit breaker to solve the technical problems in the prior art where the central magnetic field is weak due to the wide area, making it difficult for the electric arc to be driven into the grid.

[0004] In a first aspect, the present invention provides an arc-quenching grid, comprising: a grid substrate, grid legs, and a first insulating layer; The grid substrate is used to cut the electric arc; The grid leg is perpendicular to the grid substrate and is located in the middle of the grid substrate, forming a T-shaped structure with the grid substrate; The first insulating layer is disposed on the grid leg and at least partially covers the grid leg, so that the grid leg can divide the arc-running area into two independent arc-starting channels.

[0005] In an optional embodiment, the length of the grid substrate is less than the length of the grid leg along the direction from the grid substrate to the grid leg.

[0006] In a second aspect, the present invention provides an arc-extinguishing chamber structure for a circuit breaker, comprising a housing and a plurality of grid plates, wherein at least one of the grid plates is an arc-extinguishing grid plate as described in any of the foregoing embodiments; The housing is located on opposite sides of the grid legs and forms two narrow slit channels with the grid legs, thereby forming an arc-extinguishing chamber with two independent arc-initiating channels.

[0007] In optional embodiments, an insulating element is also included; Multiple arc-extinguishing grid plates are provided, and all of the arc-extinguishing grid plates are arranged along the height direction from bottom to top of the arc-extinguishing chamber; The insulating element is sleeved on all or part of the grid legs to divide the arc-running area into two independent arc-initiating channels, and the insulating element forms the first insulating layer on the grid legs.

[0008] In an optional embodiment, the insulating element is in the form of a stepped structure with a central protrusion; All the arc-extinguishing grids are divided into at least two groups from bottom to top, and the length of the grid leg in the first group from bottom to top is less than the length of the grid leg in the second group.

[0009] In an optional embodiment, the housing is made of an insulating material; or; The housing is provided with a second insulating layer, and the second insulating layer covers at least the side of the housing facing the grid leg.

[0010] In an optional implementation, a magnetic conductor is also included; The magnetic conductor is disposed inside the housing.

[0011] In an optional embodiment, the portion of the housing located at the entrance of the narrow slit channel is flared outwards, so that the width of the narrow slit channel narrows from the entrance toward the interior of the arc-extinguishing chamber.

[0012] In an optional embodiment, the circuit breaker includes a base; The housing and the base are separate structures, with the housing mounted on the base; Alternatively, the shell and the base are integrally formed.

[0013] Thirdly, the present invention provides a circuit breaker including the arc-extinguishing chamber structure described in any one of the foregoing embodiments.

[0014] Compared with the prior art, the technical advantages of the arc-extinguishing grid, arc-extinguishing chamber structure, and circuit breaker provided by the present invention are as follows: The arc-extinguishing grid provided by the present invention includes: a grid substrate, grid legs, and a first insulating layer; the grid substrate is used to cut the electric arc; the grid legs are perpendicular to the grid substrate and located in the middle of the grid substrate, forming a T-shaped structure with the grid substrate; the first insulating layer is disposed on the grid legs and at least covers part of the grid legs, so that the grid legs can divide the arc-running area into two independent arc-initiating channels.

[0015] The arc-extinguishing grid has a T-shaped structure, allowing the grid legs to extend to the center of the arc-running area after installation to form the arc-extinguishing chamber. When an arc is generated, the T-shaped grid helps strengthen the magnetic field in the center of the arc-running area, effectively solving the problem in existing technologies where the wide area results in a weak central magnetic field and difficulty in driving the arc into the grid. Simultaneously, the strengthened magnetic field can more actively and rapidly pull the arc towards the cutting area of ​​the arc-extinguishing grid, improving arc movement efficiency and arc extinguishing speed. Furthermore, an insulating material is wrapped around the surface of the grid legs to form a first insulating layer, providing electrical isolation. This first insulating layer can completely cover the entire grid leg or at least cover its sides and ends facing the arc-starting channels. When multiple T-shaped arc-extinguishing grids with the first insulating layer are assembled, the grid legs and their first insulating layers divide a wide arc-running area into two independent channels.

[0016] The arc-extinguishing chamber structure provided by the present invention includes the aforementioned arc-extinguishing grid plate. Therefore, the technical advantages and effects achieved therefrom include those achieved by the aforementioned arc-extinguishing grid plate, which will not be elaborated here.

[0017] The circuit breaker provided by the present invention includes the above-mentioned arc-extinguishing chamber structure. Therefore, the technical advantages and effects achieved by it include the technical advantages and effects achieved by the above-mentioned arc-extinguishing chamber structure, which will not be described in detail here.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an arc-extinguishing chamber structure with T-shaped arc-extinguishing grids provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of an integrated shell and base structure provided in an embodiment of the present invention; Figure 3 A perspective view of the arc-extinguishing chamber without insulation components provided in an embodiment of the present invention; Figure 4 A perspective view of an arc-extinguishing chamber with insulating components provided in an embodiment of the present invention; Figure 5 A perspective view of the housing and base provided in an embodiment of the present invention; Figure 6This is a perspective view of the housing, base, and arc-extinguishing chamber provided in an embodiment of the present invention.

[0021] Icons: 1-Arc extinguishing grid; 11-Grid substrate; 12-Grid leg; 2-Housing; 21-Slot; 3-Magnetic conductor; 4-Insulator; 5-Base. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

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

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0026] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0027] The specific structure is as follows: Figures 1 to 6 As shown.

[0028] This embodiment provides an arc-extinguishing grid 1, including: a grid substrate 11 and a grid leg 12; the grid substrate 11 is used to cut the electric arc; the grid leg 12 is perpendicular to the grid substrate 11 and is located in the middle of the grid substrate 11, forming a T-shaped structure with the grid substrate 11.

[0029] In this embodiment, the arc-extinguishing grid 1 has a T-shaped structure, which allows the grid legs 12 to extend to the center of the arc-running area after the arc-extinguishing chamber is formed. When an electric arc is generated, the T-shaped arc-extinguishing grid 1 helps to strengthen the magnetic field in the center of the arc-running area, thereby effectively solving the problem in the prior art where the central magnetic field is weak due to the wide area, making it difficult for the electric arc to be driven into the grid. At the same time, the strengthened magnetic field can more actively and quickly pull the electric arc towards the cutting area of ​​the arc-extinguishing grid 1, improving the arc movement efficiency and arc extinguishing speed.

[0030] In the optional technical solution of this embodiment, a first insulating layer is also included; the first insulating layer is disposed on the grid leg 12 and at least covers part of the grid leg 12, so that the grid leg 12 can divide the arc running area into two independent arc initiation channels.

[0031] In this embodiment, an insulating material is wrapped around the surface of the grid leg 12 to form a first insulating layer, which serves as an electrical isolation layer. The first insulating layer can completely cover the entire grid leg 12, or at least cover its sides and ends facing the arc-extinguishing channels on both sides. When multiple T-shaped arc-extinguishing grids 1 with the first insulating layer are assembled, the grid leg 12 and its first insulating layer divide a wide arc-running area into two independent channels on the left and right.

[0032] In the optional technical solution of this embodiment, the length of the grid substrate 11 is less than the length of the grid leg 12 along the direction from the grid substrate 11 to the grid leg 12.

[0033] In this embodiment, the length of the grid leg 12 along its extension direction (i.e., the direction perpendicular to the grid substrate 11) is greater than the length of the grid substrate 11. The longer grid leg 12 can extend deeper to the center of the arc-running region, resulting in a larger range and earlier action of the magnetic field enhancement effect.

[0034] This embodiment is not limited to this. Along the direction from the grid substrate 11 to the grid leg 12, the length of the grid substrate 11 can also be equal to or less than the length of the grid leg 12, as long as the requirements are met.

[0035] This embodiment provides an arc-extinguishing chamber structure for a circuit breaker, including a housing 2 and multiple grid plates, wherein at least one grid plate is the aforementioned arc-extinguishing grid plate 1. Therefore, the technical advantages and effects achieved by this arc-extinguishing chamber structure include the technical advantages and effects achieved by the aforementioned arc-extinguishing grid plate 1, which will not be elaborated here.

[0036] The housing 2 is located on opposite sides of the grid leg 12, and forms two narrow slit channels with the grid leg 12, thereby forming an arc extinguishing chamber with two independent arc ignition channels.

[0037] like Figure 5 As shown, in this embodiment, the housing 2 has a slot 21 corresponding to the arc-extinguishing grid 1 at one end facing the grid base 11. One end of the grid base 11 is inserted into the slot 21, so that the arc-extinguishing grid 1 is installed securely.

[0038] In the optional technical solution of this embodiment, an insulating component 4 is also included; multiple arc-extinguishing grid plates 1 are provided, and all arc-extinguishing grid plates 1 are arranged along the height direction from bottom to top of the arc-extinguishing chamber; the insulating component 4 is sleeved on all or part of the grid plate legs 12 to divide the arc-running area into two independent arc-initiating channels, and the insulating component 4 forms the first insulating layer on the sleeved grid plate legs 12.

[0039] In this embodiment, the first insulating layer can be independently provided on each arc-extinguishing grid 1, or an insulating member 4 can be provided, which is sleeved on the grid legs 12 of all the arc-extinguishing grid 1. In this case, the portion of the insulating member 4 corresponding to the grid legs 12 of each arc-extinguishing grid 1 forms the first insulating layer of that grid leg 12; or the insulating member 4 is sleeved on the grid legs 12 of some of the arc-extinguishing grid 1. In this case, the portion of the insulating member 4 corresponding to the grid legs 12 of each arc-extinguishing grid 1 on which it is sleeved forms the first insulating layer of that grid leg 12, while the grid legs 12 of the remaining arc-extinguishing grid 1 not sleeved by the insulating member 4 can be provided with a first insulating layer separately.

[0040] In this embodiment, multiple arc-extinguishing grid plates 1 are provided, making it easier for the electric arc to be driven into the arc-extinguishing chamber. When all grid plates are arc-extinguishing grid plates 1, the effect of driving the electric arc is the best.

[0041] In this preferred embodiment, the insulating component 4 is a gas-generating component.

[0042] In the optional technical solution of this embodiment, the insulating member 4 is in the form of a stepped shape with a raised middle; all the arc-extinguishing grid plates 1 are divided into at least two groups from bottom to top, and the length of the grid plate leg 12 in the first group from bottom to top is less than the length of the grid plate leg 12 in the second group.

[0043] In this embodiment, the lengths of the grid legs 12 of the arc-extinguishing grid 1 can be different to match the shape of the insulating member 4. In this embodiment, the side of the insulating member 4 is a stepped shape with a raised center. The corresponding arc-extinguishing grids 1 are divided into at least two groups from bottom to top. The length of the grid legs 12 in the first group from bottom to top is less than the length of the grid legs 12 in the second group. That is, the grid legs 12 in the second group are located in the raised center part of the insulating member 4. It should be noted that, in addition to the first and second groups from bottom to top, there can also be a third group. The length of the grid legs 12 in the third group is less than the length of the grid legs 12 in the second group.

[0044] In the optional technical solutions of this embodiment, the housing 2 is made of insulating material; or, the housing 2 is provided with a second insulating layer, and the second insulating layer at least covers the side of the housing 2 facing the grid leg 12.

[0045] In this embodiment, the first implementation involves integrally molding the housing 2 from insulating material using an injection molding process. This gives the housing 2 excellent electrical insulation properties and mechanical strength, simplifying the manufacturing process. The second implementation involves the housing 2 being made of either non-insulating or insulating material. A second insulating layer is provided on the wall surface facing the grid leg 12, which forms the narrow slit channel. This second insulating layer can partially or completely cover the side of the housing 2 facing the grid leg 12. Both implementations ensure reliable insulation strength between the narrow slit channel area and the housing 2, preventing high-temperature arcs from puncturing the channel wall or causing the housing 2 to carbonize, become conductive, or deform, thus ensuring the long-term reliability and safety of the arc-extinguishing chamber. Preferably, the second insulating layer and the first insulating layer are gas-generating materials.

[0046] In the optional technical solution of this embodiment, a magnetic conductor 3 is also included; the magnetic conductor 3 is disposed inside the housing 2.

[0047] In this embodiment, a magnetic conductor 3 is embedded or fixedly installed inside the housing 2. The magnetic conductor 3 can be strip-shaped, but is not limited to this; it can also be sheet-shaped or block-shaped, or any other shape that meets the requirements, and is arranged along the length of the housing 2, with its position corresponding to the arc-running area. The magnetic conductor 3 embedded in the housing 2 can effectively converge and guide magnetic lines of force, significantly enhancing the magnetic field strength in the arc-running area and at the entrance of its narrow slit channel. At the same time, the magnetic conductor 3, embedded inside the housing 2, acts as a skeleton and reinforcing rib, significantly improving the strength of the housing 2.

[0048] In the optional technical solution of this embodiment, the portion of the housing 2 located at the entrance of the narrow slit channel is shaped like an outwardly expanding trumpet, so that the width of the narrow slit channel narrows from the entrance towards the interior of the arc-extinguishing chamber.

[0049] In this embodiment, at the entrance of the narrow slit channel, the wall of the housing 2 is configured into an outwardly expanding funnel shape, maximizing the width at the entrance. Subsequently, the width of the narrow slit channel gradually and smoothly decreases. The funnel-shaped entrance structure provides a smooth, low-resistance transition area for the arc. This allows for more effective capture and collection of the arc pulled from between the contacts. Regardless of the initial position of the arc, it is more easily guided into the gradually narrowing slit channel, effectively preventing the arc from lingering, stalling, or colliding with the sharp right-angle entrance edge at the entrance, thereby improving the efficiency and reliability of the arc entering the arc-extinguishing chamber.

[0050] In the optional technical solution of this embodiment, the circuit breaker includes a base 5, and the housing 2 and the base 5 are separate structures, with the housing 2 mounted on the base 5.

[0051] In this embodiment, the circuit breaker has a base 5. In this implementation, the housing 2 of the arc-extinguishing chamber structure is a component independent of the base 5. The housing 2 is fixedly installed on the base 5 at a predetermined position by means of fasteners, screws, or guide rails. The separate housing 2 and the arc-extinguishing grid 1 are installed as an integral part, which allows the arc-extinguishing chamber structure to be produced and maintained as an independent module, improving production flexibility and maintainability. If the arc-extinguishing chamber is damaged, it can be replaced separately, reducing maintenance costs.

[0052] In the optional technical solution of this embodiment, the circuit breaker includes a base 5, and the housing 2 is integrally formed with the base 5.

[0053] In this embodiment, the base 5 of the circuit breaker and the shell 2 of the arc-extinguishing chamber structure are integrally formed, which has higher strength and structural stability. At the same time, it reduces the number of parts and assembly steps, which helps to improve production efficiency, reduce manufacturing costs, and avoid the installation errors that may exist in the split structure.

[0054] The circuit breaker provided in this embodiment includes the above-mentioned arc-extinguishing chamber structure. Therefore, the technical advantages and effects achieved by the circuit breaker include the technical advantages and effects achieved by the above-mentioned arc-extinguishing chamber structure, which will not be repeated here.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An arc-quenching grid, characterized in that, include: The grid substrate (11), the grid legs (12), and the first insulating layer; The grid substrate (11) is used to cut the electric arc; The grid leg (12) is perpendicular to the grid substrate (11) and is located in the middle of the grid substrate (11) to form a T-shaped structure with the grid substrate (11); The first insulating layer is disposed on the grid leg (12) and at least partially covers the grid leg (12) so that the grid leg (12) can divide the arc running area into two independent arc initiation channels.

2. The arc-quenching grid plate according to claim 1, characterized in that, Along the direction from the grid substrate (11) to the grid leg (12), the length of the grid substrate (11) is less than the length of the grid leg (12).

3. An arc-extinguishing chamber structure for use in a circuit breaker, characterized in that, It includes a housing (2) and a plurality of grids, wherein at least one of the grids is an arc-extinguishing grid (1) as described in any one of claims 1-2. The housing (2) is located on opposite sides of the grid leg (12) and forms two narrow slit channels with the grid leg (12), thereby forming an arc extinguishing chamber with two independent arc initiation channels.

4. The arc-extinguishing chamber structure according to claim 3, characterized in that, It also includes insulating components (4); Multiple arc-extinguishing grid plates (1) are provided, and all the arc-extinguishing grid plates (1) are arranged along the height direction from bottom to top of the arc-extinguishing chamber; The insulating element (4) is sleeved on all or part of the grid legs (12) to divide the arc running area into two independent arc-inducing channels. The insulating element (4) forms the first insulating layer on the grid legs (12).

5. The arc-extinguishing chamber structure according to claim 4, characterized in that, The insulating element (4) is in the shape of a stepped structure with a raised center; All the arc-extinguishing grids (1) are divided into at least two groups from bottom to top, and the length of the grid leg (12) in the first group from bottom to top is less than the length of the grid leg (12) in the second group.

6. The arc-extinguishing chamber structure according to claim 3, characterized in that, The housing (2) is made of insulating material; or; The housing (2) is provided with a second insulating layer, and the second insulating layer covers at least the side of the housing (2) facing the grid leg (12).

7. The arc-extinguishing chamber structure according to claim 3, characterized in that, It also includes a magnetic conductor (3); The magnetic conductor (3) is disposed inside the housing (2).

8. The arc-extinguishing chamber structure according to claim 3, characterized in that, The portion of the housing (2) located at the entrance of the narrow slit channel is flared outwards, so that the width of the narrow slit channel narrows from the entrance toward the interior of the arc-extinguishing chamber.

9. The arc-extinguishing chamber structure according to claim 3, characterized in that, The circuit breaker includes a base (5); The shell (2) and the base (5) are separate structures, and the shell (2) is installed on the base (5); Alternatively, the shell (2) and the base (5) are integrally formed.

10. A circuit breaker, characterized in that, The arc-extinguishing chamber structure includes any one of claims 4-9.

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