Arc extinguishing structure of circuit breaker

Abstract

An arc extinguishing structure of a circuit breaker comprises an arc extinguishing chamber, arcs generated by breaking of a moving contact and a static contact can enter the arc extinguishing chamber to be extinguished, and the arc extinguishing structure is characterized by further comprising a gas generating cover, the foot portion of an arc extinguishing grid piece set of the arc extinguishing chamber is located in the gas generating cover, and a groove hole penetrating through the gas generating cover is formed in the gas generating cover. And the slotted hole is positioned between two adjacent foot parts and is communicated with the arc extinguishing grid plate group. The groove holes are additionally formed in the gas production cover, the gas production area is increased, meanwhile, the electric arc is lengthened, the electric arc can rapidly enter the arc extinguish chamber to be extinguished, and therefore the breaking performance of the circuit breaker is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to an arc extinguishing structure of a circuit breaker. Background Art

[0002] Circuit breakers are an important part of power distribution equipment. They are used in industrial low-voltage power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. The function of circuit breakers to disconnect overload or short-circuit currents is mainly accomplished by the arc extinguishing system installed in the circuit breaker. When a fault current appears in the circuit and the current value exceeds the set protection range of the release, the operating mechanism is activated to quickly disconnect the moving and static contacts of the circuit breaker. At this time, the voltage between the moving and static contacts causes the air medium to discharge and generate a high-temperature arc. The arc causes the air temperature in the arc extinguishing device to rise sharply during the burning process, thereby accelerating the ionization of the air. On the other hand, the arc is driven by the magnetic field and fluid effect in the arc extinguishing chamber, and is divided into multiple short arcs by multiple arc-isolating grids. The arc deionization effect is enhanced by the metal arc-isolating grids, and the arc becomes smaller and the voltage rises rapidly, causing the arc to extinguish.

[0003] In order to improve the arc extinguishing performance of the arc extinguishing chamber, it is generally necessary to allow the arc to quickly enter the arc extinguishing grid of the arc extinguishing chamber so that the grid can effectively cut the arc, thereby achieving the goal of quickly extinguishing the arc. To achieve this goal, the current common practice is to use air blowing or magnetic blowing technology to allow the arc to quickly enter the arc extinguishing grid of the arc extinguishing chamber. As for the air blowing technology, gas-producing materials are often used in conjunction with a gradually shrinking arc channel (called Laval nozzle) to achieve it. The principle of this scheme is to make the air pressure at the front end of the arc extinguishing chamber higher than the back of the arc extinguishing chamber through the gradually shrinking arc channel, thereby forming an air flow and blowing the arc to move toward the arc extinguishing chamber. With the increasing requirements for the breaking capacity of circuit breakers, the structure of the existing low-voltage circuit breaker arc extinguishing system cannot achieve the expected effect, so it is necessary to further improve the performance of the arc extinguishing chamber. Utility Model Content

[0004] The purpose of the utility model is to provide an arc extinguishing structure for a circuit breaker in response to the need to improve the arc extinguishing capacity of the existing arc extinguishing system of low-voltage circuit breakers. By improving the structure of the existing arc extinguishing system of the circuit breaker, slots are added to the gas production hood to increase the gas production area and lengthen the arc, so that the arc can quickly enter the arc extinguishing chamber and be extinguished, thereby improving the breaking performance of the circuit breaker.

[0005] Technical Solution

[0006] In order to achieve the above technical purpose, the utility model provides an arc extinguishing structure of a circuit breaker, which includes an arc extinguishing chamber, and the arc generated by the disconnection of the moving contact and the static contact can enter the arc extinguishing chamber and be extinguished. It is characterized in that it also includes a gas generating hood, and the foot of the arc extinguishing grid group of the arc extinguishing chamber is located in the gas generating hood, and the gas generating hood is provided with a slot hole that passes through the gas generating hood, and the slot hole is located between two adjacent feet and is connected to the arc extinguishing grid group.

[0007] In one embodiment, a groove is provided on one side surface of the gas generating hood corresponding to the foot of the arc extinguishing grid group, the foot of the arc extinguishing grid is located in the groove, and the slot hole is located between adjacent grooves.

[0008] In one embodiment, a side of the gas generating hood located at the arc channel is a curved surface, and the curved surface is a concave-convex surface or a smooth surface.

[0009] In one embodiment, the gas generating hood has a straight surface facing the arc extinguishing chamber.

[0010] In one embodiment, the gas generating hood forms a gradually narrowing arc contraction zone on the arc channel entering the arc extinguishing chamber.

[0011] In one embodiment, the arc expansion zone corresponds to the arc contraction zone in the arc extinguishing chamber.

[0012] In one embodiment, the arc striking plate is located below the arc extinguishing chamber, and the arc striking plate corresponds to the arc contraction zone and the arc expansion zone in a straight plate area.

[0013] In one embodiment, the gas generating hood is an insulating gas generating hood.

[0014] In one of the embodiments, the arc extinguishing chamber includes an arc extinguishing grid group, and mounting plate groups are installed at both ends of the arc extinguishing grid group. The mounting plate group includes mounting plate 1 and mounting plate 2, and mounting plate 1 and mounting plate 2 are tightly fixed together side by side. Mounting hole 1 is provided at corresponding positions of mounting plate 1 and mounting plate 2, and convex feet extend from both sides of the arc extinguishing grid group, and the convex feet are fixed in mounting hole 1.

[0015] In one embodiment, a mounting column is provided on the gas generating hood, and the mounting column is inserted into the second mounting hole on the mounting plate assembly.

[0016] Beneficial Effects

[0017] The utility model provides an arc extinguishing structure of a circuit breaker, which includes an arc extinguishing chamber, and the arc generated by the disconnection of a moving contact and a static contact can enter the arc extinguishing chamber to be extinguished. The utility model is characterized in that: it also includes a gas generating hood, and the foot of the arc extinguishing grid group of the arc extinguishing chamber is located in the gas generating hood, and the gas generating hood is provided with slots penetrating the gas generating hood, and the slots are located between two adjacent feet to increase the gas generating area and lengthen and cool the arc at the same time. By adding slots on the gas generating hood to increase the gas generating area and lengthen the arc at the same time, the arc can quickly enter the arc extinguishing chamber and be extinguished, thereby improving the circuit breaker breaking performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Attached Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0020] Attached Figure 2 It is a schematic diagram of the exploded structure of the arc extinguishing chamber in the embodiment of the utility model.

[0021] Attached Figure 3 It is a schematic diagram of the cooperation between the arc extinguishing grid group and the gas generating hood in the embodiment of the utility model.

[0022] Attached Figure 4 It is a schematic diagram of a gas generating hood in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0028] Example

[0029] As attached Figure 1 As shown, this embodiment provides an arc extinguishing structure of a circuit breaker, which includes an arc extinguishing chamber 1, and the arc generated by the disconnection of the moving contact 2 and the static contact 3 can enter the arc extinguishing chamber 1 to be extinguished, and is characterized in that: it also includes a gas generating hood 4, and the foot 101a of the arc extinguishing grid group 101 of the arc extinguishing chamber 1 is located in the gas generating hood 4, and the gas generating hood 4 is provided with a slot 401 that passes through the gas generating hood 4, and the slot 401 is located between two adjacent feet 101a and is connected to the arc extinguishing grid group 101 to increase the gas generating area and lengthen the arc at the same time. The specific function is that the through slots 401 penetrate the front and rear sides of the gas hood 4, so that the arc can contact the foot 101a of the arc extinguishing grid group 101 through the slots 401. It can be understood that when the foot 101a of the arc extinguishing grid group 101 is completely wrapped by the gas generating hood 4, the arc can contact the side of the abdomen of the arc extinguishing grid group 101 through the slots 401, and the number of the slots 401 matches the number of arc extinguishing grids.

[0030] As attached Figure 4As shown, the gas generating hood 4 is an insulating gas generating hood. The side of the gas generating hood 4 located at the arc channel is an arc surface 403, and the arc surface 403 is a concave-convex surface or a smooth surface. The side of the gas generating hood 4 facing the arc extinguishing chamber is a straight surface 404, and the straight surface 404 is a concave-convex surface or a smooth surface. The gas generating hood 4 forms a gradually narrowing arc contraction zone 5 for the arc channel entering the arc extinguishing chamber 1, and the arc expansion zone (not shown in the figure) corresponds to the arc contraction zone 5 in the arc extinguishing chamber 1. The arc striking plate 6 is located below the arc extinguishing chamber 1, and the arc striking plate 6 corresponds to the arc contraction zone 5 and the arc expansion zone is a straight plate area 601.

[0031] Further, as attached Figure 2 and 3 As shown, specifically, a groove 402 is provided on one side of the gas generating hood 4 corresponding to the foot 101a of the arc extinguishing grid group 101, and the number of the grooves 402 matches the number of arc extinguishing grids. Generally speaking, the foot 101a of two adjacent arc extinguishing grids 101b are located in adjacent grooves 402, and the slot hole 401 is located between the adjacent grooves 402. To be more specific, the arc extinguishing chamber 1 includes an arc extinguishing grid group 101, and mounting plate groups 102 are installed at both ends of the arc extinguishing grid group 101. The mounting plate group 102 includes a mounting plate 102a and a mounting plate 102b. The mounting plate 102a and the mounting plate 102b are fixed together tightly and side by side. Mounting holes 102c are provided at corresponding positions of the mounting plates 102a and 102b. Protruding feet 101c extend from both sides of the arc extinguishing grid group 101, and the protruding feet 101c are fixed in the mounting holes 102c. The gas generating hood 4 is provided with an arc surface 403, and the arc surface 403 forms a trumpet shape to form a gradually narrowing arc contraction zone 5 in the arc channel. The gas generating hood 4 is provided with a mounting column 405, and the mounting column 405 is inserted into the mounting hole 2 102d on the mounting plate group 102.

[0032] This embodiment provides a circuit breaker arc extinguishing structure, in which the moving contact generating the arc is located in the middle of the arc contraction zone 5, as shown in the attached Figure 1 As shown, there is an arc contact in the middle and multiple main contacts arranged side by side on both sides. The arc is generated by the arc contact, and the moving contact generating the arc is close to the side of the arc contraction zone 5, that is, multiple moving contacts are arranged side by side, each moving contact generates an arc, and the moving contacts on both sides are close to the side of the arc contraction zone 5. The slots 401 can increase the gas production area and lengthen the arc when the arc passes through the gas production hood 4.

[0033] Specifically, the moving contact generating the arc is located in the middle of the arc contraction zone 5, as shown in the attached Figure 1In the case shown in FIG. 1 , there is an arc contact in the middle and multiple main contacts arranged side by side on both sides. When the arc passes through the surface of the arc surface 403, since there are slots 401 on the surface of the arc surface 403, the arc is elongated while the gas production area is increased. Then the arc passes through the gradually shrinking arc channel into the arc extinguishing chamber and is cut and extinguished by the middle part of the abdomen of the arc extinguishing grid.

[0034] As for the moving contact generating the arc close to the side of the arc contraction zone 5, that is, there are multiple moving contacts arranged side by side and each moving contact generates an arc, the arc generated by the moving contact in the middle enters the arc extinguishing chamber through the gradually shrinking arc channel, and the arc generated by the moving contacts on both sides may be retained on the surface of the arc surface 403 and have difficulty in entering the arc extinguishing chamber through the gradually shrinking arc channel. At this time, since there are slots 401 on the surface of the arc surface 403, the arcs generated by the moving contacts on both sides are also elongated while the gas production area is increased. Then, the arcs generated by the moving contacts on both sides can enter the arc extinguishing chamber through the slots 401 and be cut and extinguished by the foot of the arc extinguishing grid or the belly corresponding to the foot.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0036] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A circuit breaker arc extinguishing structure, comprising an arc extinguishing chamber (1), wherein an arc generated by disconnection of a moving contact (2) and a stationary contact (3) can enter the arc extinguishing chamber (1) and be extinguished, characterized in that: It also comprises a gas generating hood (4), wherein the foot portion (101a) of the arc extinguishing grid plate group (101) of the arc extinguishing chamber (1) is located in the gas generating hood (4), and the gas generating hood (4) is provided with a slot hole (401) penetrating the gas generating hood (4), and the slot hole (401) is located between two adjacent foot portions (101a) and communicates with the arc extinguishing grid plate group (101).

2. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: A groove (402) is provided on a side surface of the gas generating hood (4) corresponding to the foot (101a) of the arc extinguishing grid plate group (101), the foot (101a) of the arc extinguishing grid plate (101b) is located in the groove (402), and the slot hole (401) is located between adjacent grooves (402).

3. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: The side of the gas generating hood (4) located at the arc channel is a curved surface (403), and the curved surface (403) is a concave-convex surface or a smooth surface.

4. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: The side of the gas generating hood (4) facing the arc extinguishing chamber is a straight surface (404).

5. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: The gas generating hood (4) forms a gradually narrowing arc contraction zone (5) for the arc channel entering the arc extinguishing chamber (1).

6. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: Corresponding to the arc contraction zone (5) in the arc extinguishing chamber (1) is an arc expansion zone.

7. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: The arc striking plate (6) is located below the arc extinguishing chamber (1), and the arc striking plate (6) corresponds to the arc contraction zone (5) and the arc expansion zone in a straight plate area (601).

8. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: The gas generating hood (4) is an insulating gas generating hood.

9. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: The arc extinguishing chamber (1) comprises an arc extinguishing grid group (101), and mounting plate groups (102) are installed at both ends of the arc extinguishing grid group (101). The mounting plate group (102) comprises a first mounting plate (102a) and a second mounting plate (102b). The first mounting plate (102a) and the second mounting plate (102b) are tightly fixed together in parallel, and mounting holes (102c) are provided at corresponding positions of the first mounting plate (102a) and the second mounting plate (102b). Convex feet (101c) extend from both sides of the arc extinguishing grid group (101), and the convex feet (101c) are fixed in the first mounting hole (102c).

10. The arc extinguishing structure of a circuit breaker according to claim 9, characterized in that: The gas generating hood (4) is provided with a mounting column (405), and the mounting column (405) is inserted into the second mounting hole (102d) on the mounting plate assembly (102).

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