CN221352636U - Arc-isolating plate for circuit breaker or isolating switch - Google Patents

Abstract

The utility model belongs to the field of electrical components, and discloses an arc-isolating plate for a circuit breaker or a disconnecting switch, which can extinguish a fleeing electric arc in time, avoid the electric arc from ablating a moving contact, and further eliminate the influence of the electric arc on the breaking performance of the circuit breaker or the disconnecting switch.

Description

Arc-isolating plate for circuit breaker or isolating switch

Technical Field

The utility model belongs to the field of electrical components, and particularly relates to an arc barrier for a circuit breaker or a disconnecting switch.

Background

The breaker or the isolating switch is an indispensable important device in a new energy system and a power distribution system, and is provided with a moving contact and a fixed contact, wherein the moving contact is contacted with or separated from the fixed contact through relative movement of the fixed contact, thereby realizing the breaking function,

With the development of technology, the novel moving contact is provided with a plurality of longer long contacts and a plurality of shorter short contacts, and the service life of the moving contact can be greatly prolonged.

With further increase of the load of a circuit system, the breaking performance requirement of a switch is continuously improved, when a circuit breaker or a disconnecting switch breaks, high-temperature high-pressure and conductive electric arcs are generated between moving and static contacts, the low-voltage switch electrical appliance extinguishes the electric arcs mainly through an arc extinguishing mechanism arranged near the moving and static contacts, specifically, the electric arcs are led into the arc extinguishing mechanism to extinguish the electric arcs through a preset arc striking structure, when the electric arcs are excessively high in voltage and flow between the arc extinguishing chambers, the electric arcs are extremely easy to blow into the area where the moving and static contacts are located, if the blow-in electric arcs cannot be extinguished in time, the electric arcs can ablate the moving and static contacts, and therefore the breaking performance of the circuit breaker or the disconnecting switch is obviously affected.

Disclosure of utility model

Aiming at the defects of the prior art, the utility model provides the arc-isolating plate for the circuit breaker or the isolating switch, which can extinguish the fleeing arc in time and avoid the erosion of the electric arc to the moving contact, thereby eliminating the influence of the electric arc on the breaking performance of the circuit breaker or the isolating switch.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

An arc-shield for a circuit breaker or disconnector having a contact unit and an arc extinguishing mechanism located in the vicinity of the contact unit, the contact unit comprising a stationary contact and a moving contact, the stationary contact and the moving contact being connected or disconnected by means of a clutch, the moving contact having a long contact group and a short contact group both extending towards the arc extinguishing mechanism and a longer contact group of the short contact group having a greater distance from the arc extinguishing mechanism, characterized in that: the arc-isolating plate for the circuit breaker or the isolating switch is positioned between the short contact group and the arc-extinguishing mechanism, the arc-isolating plate for the circuit breaker or the isolating switch is provided with a through hole extending along the clutch direction of the fixed contact and the moving contact, the long contact group passes through the through hole, and the long contact group is movably arranged relative to the through hole.

Preferably, a motion path of the free end of the short contact group in the clutch process is used as a clutch path, an arc-isolating plate for the circuit breaker or the disconnecting switch is provided with an arc-reducing matching surface parallel to the clutch path, and the distance between the clutch path and the arc-reducing matching surface is smaller than a preset arc-reducing gap.

Further, the arc reduction mating surface is a concave cambered surface.

Preferably, the opposite sides of the arc-isolating plate for the circuit breaker or the disconnecting switch are respectively provided with a clamping part, the circuit breaker or the disconnecting switch is provided with a mechanism shell, the arc-isolating plate for the circuit breaker or the disconnecting switch, the long contact group, the short contact group and the arc-extinguishing mechanism are all positioned in the mechanism shell, the inner walls of the opposite sides of the mechanism shell are respectively provided with a clamping matching part matched with the clamping parts, and the arc-isolating plate for the circuit breaker or the disconnecting switch is detachably arranged in the mechanism shell through the clamping parts.

Further, the number of the clamping parts is three, and the midpoints of the three clamping parts form three corner points of the same isosceles triangle.

Further, the clamping part is a groove, and the clamping matching part is a bump.

Preferably, the arc-shield plate for the circuit breaker or the disconnecting switch has two long side plate portions and one short side plate portion, the two long side plate portions extend along the length direction of the overhead through hole, the short side plate portion extends along the width direction of the overhead through hole, the arc-shield plate for the circuit breaker or the disconnecting switch has a plurality of first uniform thickness blind holes and at least one second uniform thickness blind hole, the first uniform thickness blind holes are formed in the long side plate portions, the second uniform thickness blind holes are formed in the short side plate portions, and the thickness of the arc-shield plate for the circuit breaker or the disconnecting switch is uniform.

Compared with the prior art, the utility model has the beneficial effects that:

1. Because the arc-isolating plate for the circuit breaker or the isolating switch is positioned between the short contact group and the arc-extinguishing mechanism, the arc-isolating plate for the circuit breaker or the isolating switch is provided with the through hole extending along the clutch direction of the fixed contact and the movable contact, the long contact group passes through the through hole and is movably arranged relative to the through hole, and when the long contact group and the fixed contact are disconnected, most of generated electric arcs are isolated from the short contact group through the arc-extinguishing mechanism and can not influence the short contact group in time, so that the utility model can timely extinguish the leaked electric arcs, avoid the electric arcs from ablating the movable contact, and eliminate the influence of the electric arcs on the disconnection performance of the circuit breaker or the isolating switch.

2. Because the motion path of the free end of the short contact group in the clutch process is used as the clutch path, the arc-isolating plate for the circuit breaker or the isolating switch is provided with the arc-reducing matching surface parallel to the clutch path, and the distance between the clutch path and the arc-reducing matching surface is smaller than the preset arc-reducing gap, a small amount of electric arcs leaked to the region where the moving contact and the static contact are located through the overhead through hole of the utility model are difficult to influence the short contact group through the arc-reducing gap, so that the electric arc ablation on the moving contact is further reduced.

3. Because the arc-shield plate for the circuit breaker or the disconnecting switch is provided with the two long side plate parts and the one short side plate part, the arc-shield plate for the circuit breaker or the disconnecting switch is provided with the first uniform thickness blind hole and the second uniform thickness blind hole, the first uniform thickness blind hole is formed in the long side plate part, the second uniform thickness blind hole is formed in the short side plate part, and the arc-shield plate for the circuit breaker or the disconnecting switch is uniform in thickness, and therefore the arc-shield plate for the circuit breaker or the disconnecting switch is uniform in thickness in the whole structure through the first uniform thickness blind hole and the second uniform thickness blind hole, and accordingly the arc-shield plate can be conveniently formed through injection molding and is good in mechanical property.

Drawings

FIG. 1 is a schematic diagram of a moving contact according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a flash barrier for a circuit breaker or disconnector according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram II of a flash barrier for a circuit breaker or disconnector according to an embodiment of the utility model;

FIG. 4 is a schematic diagram showing the cooperation of a flash barrier and a moving contact for a circuit breaker or a disconnector according to the present utility model;

Fig. 5 is a second schematic diagram of the cooperation between a flash barrier and a moving contact for a circuit breaker or a disconnector according to the present utility model;

fig. 6 is a diagram of an embodiment of the present utility model implemented in a circuit breaker or disconnector.

In the figure: s, mechanism shell, A, arc extinguishing mechanism, J, static contact, M, moving contact, ML, long contact group, MS, short contact group, 10, arc-stop plate for circuit breaker or isolator, 1, overhead through hole, 2, arc-reduction mating surface, 3, clamping part, 4, long side plate part, 4a, first uniform thickness blind hole, 5, short side plate part, 5a, second uniform thickness blind hole.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement of the purposes and the effects of the present utility model easy to understand, the following examples specifically describe an arc-shaped plate for a circuit breaker or a disconnector according to the present utility model with reference to the accompanying drawings, and it should be noted that the description of these embodiments is for aiding in understanding the present utility model, but not limiting the present utility model.

As shown in fig. 1 and 6, the circuit breaker or the disconnecting switch in this embodiment has a mechanism housing S and an arc extinguishing mechanism a located inside the mechanism housing S, and inside the mechanism housing S, the arc extinguishing mechanism a is located near a contact unit, the contact unit includes a fixed contact J and a moving contact M, the fixed contact J and the moving contact M are connected to or disconnected from a circuit through a clutch, the moving contact M has a long contact group ML and a short contact group MS extending toward the arc extinguishing mechanism a, the long contact group ML and the short contact group MS are located inside the mechanism housing S, and the short contact group MS has a larger distance from the arc extinguishing mechanism a, a moving path of a free end of the short contact group MS in a clutch process is used as a clutch path, specifically, the arc extinguishing mechanism a is located at the top in an inner cavity of the mechanism housing S, the contact unit moving contact M and the fixed contact J are located between the top and the bottom in the inner cavity of the mechanism housing S, the moving contact J are externally connected to or disconnected from the moving contact J through an operating mechanism, so that the moving contact J is hinged to rotate in the mechanism housing S, the long contact group ML and the short contact group ML are connected to the short contact group ML along a thickness direction, and the number of the short contact group ML is a short contact group ML or a short contact group ML, and a short contact group ML is connected to a short contact group ML along a short contact group rotation direction, and a short contact group ML is a short contact group is connected to a short contact group, and a short contact group ML or a short contact group is made to a short contact group, and a short contact group ML, and a short contact group is a moving contact group and a moving contact is a moving contact.

As shown in fig. 2 to 5, an arc-stop plate 10 for a circuit breaker or a disconnector in the present embodiment is located between a short contact group MS and an arc extinguishing mechanism a, and has an overhead through hole 1, an arc reduction mating surface 2, a snap-in portion 3, a long side plate portion 4, and a short side plate portion 5.

The through hole 1 extends along the clutch direction of the fixed contact J and the moving contact M, the long contact group ML passes through the through hole 1, and the long contact group ML is movably arranged relative to the through hole 1, in this embodiment, one end of the through hole 1 is opened, and the opened end corresponds to the electrical connection position of the fixed contact J and the moving contact M.

The arc-reducing matching surface 2 is parallel to the clutch path, the distance between the clutch path and the arc-reducing matching surface is smaller than the preset arc-reducing gap, specifically, the arc-reducing matching surface 2 is a concave arc surface, namely, the free end of the short contact group MS and the arc-reducing matching surface 2 always keep a narrow gap in the whole rotation process of the moving contact M, so that an electric arc leaked from the through hole 1 is difficult to enter the narrow gap to contact with the short contact group MS.

The engaging portions 3 are respectively located on opposite sides of the arc-shield plate 10 for the circuit breaker or the disconnecting switch, the inner walls of the opposite sides of the mechanism housing S are respectively provided with engaging portions (not shown in the drawings) which are engaged with the engaging portions 3, the arc-shield plate 10 for the circuit breaker or the disconnecting switch is detachably disposed inside the mechanism housing S through the insertion engagement of the engaging portions 3 and the engaging portions, specifically, the number of the engaging portions 3 is three, the midpoints of the three engaging portions 3 form three corner points of the same isosceles triangle, thereby forming a stable triangular support in the mechanism housing S, the engaging portions 3 are grooves, the engaging portions are projections, in the embodiment, one side surface of the arc-shield plate 10 for the circuit breaker or the disconnecting switch is provided with one engaging portion 3 in the form of a through groove, and the other side surface is provided with two engaging portions 3 with one end closed and one end opened.

The number of the long side plate portions 4 is two, the number of the short side plate portions 5 is one, the two long side plate portions 4 extend along the length direction of the through hole 1, the short side plate portions 5 extend along the width direction of the through hole 1, and in this embodiment, the whole formed by the two long side plate portions 4 and the short side plate portions 5 is in a "匚" shape.

The long side plate part 4 is provided with a plurality of first uniform thickness blind holes 4a, the short side plate part 5 is provided with at least one second uniform thickness blind hole 5a, so that the thickness of the arc-isolating plate 10 for the circuit breaker or the disconnecting switch is uniform, in particular, the arc-isolating plate 10 for the circuit breaker or the disconnecting switch is provided with a square hole due to the fact that the clamping part 3 and the inner wall of the mechanism shell S are required to be ensured simultaneously, the arc-reducing matching surface 2 is matched with the free end of the short contact group MS, so that the length-width ratio of the whole structure is large, the injection molding processing is easier, the better mechanical property is obtained, the entity thickness of the whole structure is ensured to be basically consistent by arranging the first uniform thickness blind holes 4a and the second uniform thickness blind holes 5a, and the first uniform thickness blind holes 4a extend along the length direction of the long side plate part 4.

The above embodiments are preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications or variations which may be made by those skilled in the art without the inventive effort within the scope of the appended claims remain within the scope of this patent.

Claims (7)

1. A flash barrier for a circuit breaker or disconnector having a contact unit and an arc extinguishing mechanism located in the vicinity of the contact unit, the contact unit comprising a stationary contact and a moving contact, the stationary contact and the moving contact being switched on or off by a clutch, the moving contact having a long contact group and a short contact group both extending towards the arc extinguishing mechanism, and the short contact group having a longer contact group having a greater distance from the arc extinguishing mechanism, characterized in that:

The arc-shield plate for the circuit breaker or disconnector is located between the short contact group and the arc extinguishing mechanism,

The arc-shield plate for the circuit breaker or the disconnecting switch is provided with a through hole extending along the clutch direction of the fixed contact and the moving contact, the long contact group penetrates through the through hole, and the long contact group is movably arranged relative to the through hole.

2. The arc shield for a circuit breaker or disconnector of claim 1, characterized in that:

The arc-stop plate for the circuit breaker or the disconnecting switch is provided with an arc-stop matching surface parallel to the clutch path, and the distance between the clutch path and the arc-stop matching surface is smaller than a preset arc-stop gap.

3. The arc shield for a circuit breaker or disconnector of claim 2, characterized in that:

wherein the arc reduction matching surface is a concave cambered surface.

4. The arc shield for a circuit breaker or disconnector of claim 1, characterized in that:

wherein, the two opposite sides of the arc-shield plate for the breaker or the disconnecting switch are respectively provided with a clamping part,

The circuit breaker or the disconnecting switch is provided with a mechanism shell, the arc-isolating plate, the long contact group, the short contact group and the arc-extinguishing mechanism for the circuit breaker or the disconnecting switch are all positioned in the mechanism shell, the inner walls of the two opposite sides of the mechanism shell are respectively provided with a clamping matching part matched with the clamping part,

The arc-shaped plate for the circuit breaker or the disconnecting switch is detachably arranged in the mechanism shell through the clamping part.

5. The arc shield for a circuit breaker or disconnector of claim 4, characterized in that:

The number of the clamping parts is three, and the midpoints of the three clamping parts form three corner points of the same isosceles triangle.

6. The arc shield for a circuit breaker or disconnector of claim 4, characterized in that:

the clamping part is a groove, and the clamping matching part is a bump.

7. The arc shield for a circuit breaker or disconnector of claim 1, characterized in that:

Wherein the arc shield for a circuit breaker or a disconnector has two long side plate portions extending in a length direction of the through-hole and one short side plate portion extending in a width direction of the through-hole,

The flash barrier for a circuit breaker or disconnector has a plurality of first blind holes of uniform thickness and at least one second blind hole of uniform thickness,

The first uniform thickness blind holes are formed in the long side plate parts, the second uniform thickness blind holes are formed in the short side plate parts, and the thickness of the arc-isolating plate for the circuit breaker or the isolating switch is uniform.