A contact arc extinguishing system for circuit breaker

Abstract

The utility model discloses a contact arc extinguishing system of a circuit breaker, which relates to the field of circuit breakers, and includes a base, a contact mechanism and an arc extinguishing mechanism, wherein the contact mechanism includes a moving contact, a stationary contact, a contact support and a contact cover mounted on the contact support, wherein the contact cover is provided with a support plate extending upward, and when the switch is opened, the contact support drives the contact cover to approach the stationary contact and allows the inner walls on both sides of the base, the support plate and the stationary contact to cooperate to form a relatively closed cavity. The utility model has the advantages of controlling the gas flow direction and having good working stability.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a contact arc extinguishing system of a circuit breaker. Background Art

[0002] Among the contact mechanisms in the prior art, there is a circuit breaker disclosed in publication number CN116053096A on May 2, 2023; it discloses that the moving contact enters the arc extinguishing chamber during the opening action, but the defect of this structure is that the top of the moving contact is open and the gas will overflow. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the utility model provides a contact arc extinguishing system of a circuit breaker which controls the gas flow direction.

[0004] The technical solution adopted by the utility model is: a contact arc extinguishing system of a circuit breaker, which includes a base, a contact mechanism and an arc extinguishing mechanism, the contact mechanism includes a moving contact, a static contact, a contact support and a contact cover installed on the contact support, the contact cover is provided with a support plate extending upward, when the circuit breaker is opened, the contact support drives the contact cover to approach the static contact and allows the inner walls on both sides of the base, the support plate and the static contact to cooperate to form a relatively closed cavity.

[0005] The support plate is square in shape, the height of the support plate corresponds to the static contact and the width of the support plate corresponds to the inner walls on both sides of the base.

[0006] The arc extinguishing mechanism includes a shell, an arc extinguishing component and a gas producing component. The gas producing component is symmetrically installed on the inner walls of both sides of the shell. A plurality of magnetizing plates are arranged between the shell and the gas producing component. The gas producing components on both sides relatively form a narrow gap for the moving contact to extend into. The narrow gap is trumpet-shaped and the opening size close to the arc extinguishing component is larger than the opening size close to the moving contact.

[0007] The gas production component comprises an insulating cover body and a gas production base which are matched with each other in a sleeve, and the insulating cover body and the gas production base cooperate to form a receiving cavity for accommodating the magnetizing sheet.

[0008] A plurality of transversely arranged positioning posts are arranged in the gas generating base, and a plurality of positioning grooves corresponding to the positioning posts are arranged on the side wall of the shell.

[0009] The insulating cover is provided with a plurality of hollow columns for avoiding the positioning columns, and the magnetizing sheet is provided with a plurality of mounting holes corresponding to the hollow columns.

[0010] The magnetizing sheet is made of iron sheet.

[0011] Fasteners for fixedly connecting the two side walls of the shell and the gas generating base are arranged between the two side walls.

[0012] The beneficial effect of the utility model is as follows: the technical scheme arranges a contact cover on the contact support, and a support plate extends outward from the contact cover. When the switch is opened, the support plate is driven by the contact support to swing, and wind pressure is generated during the swinging. In addition, the inner walls on both sides of the base, the support plate and the static contact cooperate to form a relatively closed cavity, which can ensure that the gas is blown toward the arc extinguishing chamber by the wind pressure, greatly reducing the situation of gas spilling outward, and has the advantage of good working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the contact arc extinguishing system of the circuit breaker according to the embodiment of the utility model.

[0014] Figure 2 It is a side view of the contact mechanism and the arc extinguishing mechanism.

[0015] Figure 3 It is a structural schematic diagram of the contact mechanism and the arc extinguishing mechanism.

[0016] Figure 4 It is a structural schematic diagram of the arc extinguishing mechanism.

[0017] Figure 5 Schematic diagram of the split structure of the arc extinguishing mechanism.

[0018] Figure 6 This is a schematic diagram of the split structure of the arc extinguishing mechanism from another angle. DETAILED DESCRIPTION

[0019] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0020] As shown in the figure, a contact arc extinguishing system of a circuit breaker includes a base 12, a contact mechanism and an arc extinguishing mechanism, wherein the contact mechanism includes a moving contact 13, a static contact 14, a contact support 15 and a contact cover 16 installed on the contact support 15, wherein the contact cover 16 is provided with a support plate 17 extending upward, and when opening the circuit breaker, the contact support 15 drives the contact cover 13 to approach the static contact 14 and allows the inner walls on both sides of the base 12, the support plate 17 and the static contact 14 to cooperate to form a relatively closed cavity; the technical solution is provided with a contact cover on the contact support, and the contact cover extends a support plate outward, and when opening the circuit breaker, the support plate is driven by the contact support to swing, and wind pressure is generated during the swinging, and the inner walls on both sides of the base, the support plate and the static contact cooperate to form a relatively closed cavity, which can ensure that the gas is blown toward the arc extinguishing chamber by the wind pressure, greatly reducing the situation of gas spilling outward, and has the advantage of good working stability.

[0021] The support plate 17 is in a square shape, and its height corresponds to the static contact 14 and its width corresponds to the inner walls on both sides of the base 12 .

[0022] The arc extinguishing mechanism includes a shell 1, an arc extinguishing component 2 and a gas producing component. The gas producing component is symmetrically installed on the inner walls of both sides of the shell 1. A plurality of magnetizing sheets 3 are arranged between the shell 1 and the gas producing components. The gas producing components on both sides relatively form a narrow gap 4 for the moving contact 13 to extend into. The narrow gap 4 is trumpet-shaped and the opening size in the direction close to the arc extinguishing component 2 is larger than the opening size in the direction close to the moving contact 13. By arranging the magnetizing sheets between the shell and the gas producing components, the magnetic flux is increased and the arc extinguishing speed is increased. In addition, the narrow gap is arranged in a trumpet shape, which can guide the gas and prevent the gas from overflowing out of the shell. It also has the advantages of increasing the gas pressure, controlling the gas flow direction and having good working stability.

[0023] The gas production component includes an insulating cover 5 and a gas production base 6 that are fitted together. The insulating cover 5 and the gas production base 6 cooperate to form a accommodating cavity for placing the magnetizing sheet 3. The insulating cover and the gas production base wrap the magnetizing sheet 3 in all directions. The entire accommodating cavity has a good sealing effect and has the advantage of good insulation effect.

[0024] The gas-producing base 6 is provided with a plurality of transversely arranged positioning posts 7, the side wall of the shell 1 is provided with a plurality of positioning grooves 8 corresponding to the positioning posts 7, the insulating cover 5 is provided with a plurality of hollow posts 9 for avoiding the positioning posts 7, the magnetizing sheet 3 is provided with a plurality of mounting holes 10 corresponding to the hollow posts 9, and the magnetizing sheet 3 is made of iron sheet; fasteners 11 for fixing the two side walls of the shell 1 and the gas-producing base 6 are provided between the two side walls; the positioning posts are inserted into the positioning grooves after passing through the hollow posts, and then are connected by fasteners, and the mounting holes of the magnetizing sheet are mounted on the hollow posts to keep the magnetizing sheet stable.

[0025] The gas generating assembly comprises an insulating cover 5 and a gas generating base 6 which are fitted together. The insulating cover 5 and the gas generating base 6 cooperate to form a receiving cavity for accommodating the magnetizing sheet 3 .

[0026] A plurality of transversely arranged positioning posts 7 are disposed in the gas generating base 6 , and a plurality of positioning grooves 8 corresponding to the positioning posts 7 are disposed on the side wall of the housing 1 .

[0027] The insulating cover 5 is provided with a plurality of hollow columns 9 for avoiding the positioning columns 7 , and the magnetizing sheet 3 is provided with a plurality of mounting holes 10 corresponding to the hollow columns 9 .

[0028] The magnetizing sheet 3 is made of iron sheet.

[0029] Fasteners 11 are provided between the two side walls of the shell 1 and the gas generating base 6 to fix the two.

[0030] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0032] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent.

Claims

1. A contact arc extinguishing system for a circuit breaker, characterized in that: It comprises a base (12), a contact mechanism and an arc extinguishing mechanism, wherein the contact mechanism comprises a moving contact (13), a stationary contact (14), a contact support (15) and a contact cover (16) mounted on the contact support (15), wherein the contact cover (16) is provided with a support plate (17) extending upwards, and when the switch is opened, the contact support (15) drives the contact cover (13) to approach the stationary contact (14) and allows the inner walls on both sides of the base (12), the support plate (17) and the stationary contact (14) to cooperate to form a relatively closed cavity.

2. The contact arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The support plate (17) is square in shape, the height of the support plate (17) corresponds to the static contact (14), and the width of the support plate (17) corresponds to the inner walls on both sides of the base (12).

3. The contact arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The arc extinguishing mechanism comprises a housing (1), an arc extinguishing assembly (2) and a gas generating assembly, wherein the gas generating assembly is symmetrically mounted on the inner walls of both sides of the housing (1), a plurality of magnetizing sheets (3) are arranged between the housing (1) and the gas generating assembly, and the gas generating assemblies on both sides are arranged to form a narrow slit (4) for the moving contact (13) to extend into, the narrow slit (4) being trumpet-shaped and having an opening size closer to the arc extinguishing assembly (2) than an opening size closer to the moving contact (13).

4. The contact arc extinguishing system of the circuit breaker according to claim 3, characterized in that: The gas generating assembly comprises a sleeve-matched insulating cover (5) and a gas generating base (6), wherein the insulating cover (5) and the gas generating base (6) cooperate to form a receiving cavity for accommodating the magnetizing sheet (3).

5. The contact arc extinguishing system of the circuit breaker according to claim 4, characterized in that: A plurality of transversely arranged positioning columns (7) are provided in the gas generating base (6), and a plurality of positioning grooves (8) corresponding to the positioning columns (7) are provided on the side wall of the shell (1).

6. The contact arc extinguishing system of the circuit breaker according to claim 5, characterized in that: The insulating cover (5) is provided with a plurality of hollow columns (9) that avoid the positioning columns (7), and the magnetizing sheet (3) is provided with a plurality of mounting holes (10) corresponding to the hollow columns (9).

7. The contact arc extinguishing system of the circuit breaker according to claim 3, characterized in that: The magnetizing sheet (3) is made of iron sheet.

8. The contact arc extinguishing system of the circuit breaker according to claim 3, characterized in that: Fasteners (11) for fixedly connecting the two side walls of the shell (1) and the gas-generating base (6) are provided between the two side walls.

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