CN219553563U - Circuit breaker and arc extinguishing system thereof - Google Patents

Abstract

The utility model discloses a circuit breaker and an arc extinguishing system thereof, wherein the arc extinguishing system comprises a box body made of insulating materials and an arc extinguishing device positioned in the box body, the box body is provided with a front wall, a rear wall and a bottom wall which are respectively positioned at the front side, the rear side and the bottom side of the arc extinguishing device, the front wall is provided with a first inlet through which a moving contact penetrates, the rear wall is provided with an exhaust port, the position of the bottom wall, which is close to the front wall, is provided with a second inlet through which a static contact penetrates, the static contact comprises a main body and a conductive contact point positioned at the end part of the main body, the conductive contact point is positioned in the box body, and one end, which is far away from the conductive contact point, of the main body is positioned outside the box body. The arc extinguishing system provided by the utility model effectively guarantees the arc extinguishing performance through reasonable structural design, reduces the influence of the breaking process on the contact system and the operating mechanism, and is beneficial to improving the stability and reliability of the circuit breaker.

Description

Circuit breaker and arc extinguishing system thereof

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker and an arc extinguishing system thereof.

Background

Most of the existing arc extinguishing systems of the circuit breaker have the defects that the protection measures between the arc extinguishing device and the contact system or the operating mechanism are poor, so that the arc extinguishing performance is reduced, and the contact system and the operating mechanism are easily damaged.

Disclosure of Invention

In view of the above, the utility model provides a circuit breaker and an arc extinguishing system thereof, which effectively ensure the arc extinguishing performance through reasonable structural design, reduce the influence of the breaking process on a contact system and an operating mechanism, and contribute to the improvement of the stability and the reliability of the circuit breaker.

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

the utility model provides an arc extinguishing system of circuit breaker, includes the box body that insulating material made and is located arc extinguishing device in the box body, the box body has and is located respectively the front wall, the back wall and the diapire of arc extinguishing device's front side, rear side and bottom side, the first import that supplies the moving contact to wear to establish is seted up to the front wall, the gas vent has been seted up to the back wall, the diapire is close to the position of front wall has been seted up the second import that supplies the stationary contact to wear to establish, the stationary contact includes the main part and is located the conductive contact point of main part tip, conductive contact point is located in the box body, the main part is kept away from conductive contact point's one end is located outside the box body.

Optionally, in the arc extinguishing system, a part of the front wall, which is located on the side of the first inlet close to the bottom wall, extends inwards to form a cover plate extending to the vicinity of the conductive contact point of the fixed contact, and the cover plate covers a part of the main body close to the conductive contact point.

Optionally, in the arc extinguishing system, a stop part capable of blocking the moving contact from moving outwards in the breaking process is formed on the edge of the first inlet far away from the bottom wall.

Optionally, in the arc extinguishing system, the parts of the front wall located at two sides of the first inlet are formed with two opposite side baffles outwards of the box body.

Optionally, in the above arc extinguishing system, the case has a top wall opposite to the bottom wall, the top wall being provided with grooves and/or protrusions for positioning the arc extinguishing device.

Optionally, in the arc extinguishing system, the case body has two opposite side walls, and an inner surface and/or an outer surface of the side walls are provided with a limit rib for reducing deformation.

Alternatively, in the above arc extinguishing system, the exhaust hole is provided in a grid structure.

Optionally, in the arc extinguishing system, the bottom wall is provided with a third inlet through which the support column passes, and the third inlet is located at one side of the second inlet close to the rear wall and opposite to the conductive contact point of the fixed contact.

Optionally, in the arc extinguishing system, the case body includes two half cases, one of the two half cases is provided with an assembly rib for butt-buckling connection, and the other is provided with an assembly groove for butt-buckling connection.

A circuit breaker comprising an arc extinguishing system as disclosed in any one of the above.

According to the technical scheme, in the arc extinguishing system of the circuit breaker, the arc extinguishing device is positioned in the box body made of the insulating material, the front wall of the box body is provided with the first inlet through which the moving contact penetrates, the rear wall is provided with the exhaust port, the position of the bottom wall close to the front wall is provided with the second inlet through which the static contact penetrates, the conductive contact point of the static contact is positioned in the box body, and one end of the main body of the static contact, which is far away from the conductive contact point, is positioned outside the box body, so that the breaking arc is limited in a relatively independent arc extinguishing cavity provided by the box body, and particles and the like possibly generated in the breaking process diffuse out from the exhaust port positioned on the rear wall, so that the arc moves according to a preset track, the arc extinguishing performance is improved, the influence on an operation mechanism around the arc extinguishing system is avoided, the position of the bottom wall close to the front wall is provided with the second inlet, the conductive contact point of the main body of the static contact is positioned in the box body, and one end of the main body, which is far away from the conductive contact point, is positioned outside the box body, so that the bottom wall of the box body forms a certain breakdown effect on the main body, and the breaking risk of the breaking system is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an arc extinguishing system of a circuit breaker according to an embodiment of the present utility model;

fig. 2 is a schematic view of another angle of an arc extinguishing system of a circuit breaker according to an embodiment of the present utility model;

fig. 3 is a schematic exploded view of an arc extinguishing system of a circuit breaker according to an embodiment of the present utility model;

fig. 4 is a schematic view illustrating an arc extinguishing system of a circuit breaker according to another embodiment of the present utility model;

fig. 5 is a schematic view of the first half-box 101 of fig. 3;

FIG. 6 is a schematic illustration of the second cassette half 102 of FIG. 3;

fig. 7 is a schematic view of a first state of a circuit breaker according to an embodiment of the present utility model;

fig. 8 is a schematic diagram of a second state of the circuit breaker according to the embodiment of the present utility model.

Marked in the figure as:

1. a case body; 2. arc extinguishing device; 3. a stationary contact;

101. a first half box; 102. a second half box;

11. an exhaust port; 12. side baffles; 13. a positioning groove; 14. a stop portion; 15. a bolt mounting hole; 16. a limit rib; 17. assembling ribs; 18. an assembly groove; 19. a nut mounting hole; 110. a cover plate;

21. positioning the bulge;

31. a conductive contact; 32. arc striking angles;

4. a moving contact; 41. a near-arc surface; 42. convex hulls;

5. a cover body; 51. a limiting surface;

6. a base; 7. an operating mechanism;

A. a first insulating protection region; B. a second insulating protection region; C. arc extinguishing cavity.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 8, an embodiment of the present utility model provides an arc extinguishing system of a circuit breaker, including a case 1 made of an insulating material and an arc extinguishing device 2 located in the case 1, where the case 1 has a front wall, a rear wall and a bottom wall respectively located at a front side, a rear side and a bottom side of the arc extinguishing device 2, the front wall is provided with a first inlet through which a moving contact 4 passes, the rear wall is provided with an exhaust port 11, a position of the bottom wall near the front wall is provided with a second inlet through which a fixed contact 3 passes, the fixed contact 3 includes a main body and a conductive contact point 31 located at an end of the main body, the conductive contact point 31 is located in the case 1, and one end of the main body far from the conductive contact point 31 is located outside the case.

As shown in fig. 1, 2 and 7, the inner space of the case 1 forms an arc extinguishing chamber C, the moving contact 4 is located in front of the case 1, i.e., in the left direction of the case 1 in fig. 7, the moving contact 4 extends into the arc extinguishing chamber C through a first inlet of the case 1, the connection terminal of the fixed contact 3 is located at the rear of the case 1, i.e., in the right direction of the case 1 in fig. 7, the fixed contact 3 extends forward from the bottom wall outer surface of the case 1 to a second inlet, then extends into the arc extinguishing chamber C through the second inlet, the conductive contact point 31 is a portion of the fixed contact 3 connected with the moving contact 4, when the moving contact 4 contacts the conductive contact point 31, the circuit breaker is in a closed state, and when the moving contact 4 is separated from the conductive contact point 31, the circuit breaker is in an open state.

As shown in fig. 8, the conductive contact point 31 is located in the case 1, and the breaking arc is limited in a relatively independent space provided by the case 1, that is, the arc extinguishing cavity C is used for extinguishing the arc, so that the influence of the arc on other components located around the case 1 inside the circuit breaker can be reduced. Particulate matters and the like possibly generated in the arc and breaking process are diffused out of the exhaust port 11 positioned on the rear wall, so that the arc moves according to a preset track, the arc extinguishing performance is improved, the influence on an operating mechanism 7 around an arc extinguishing system is avoided, in addition, the main body of the fixed contact 3 is penetrated into the second inlet of the bottom wall of the box body 1, the second inlet is formed at the position, close to the front wall, of the bottom wall, a conductive contact point 31 at the end part of the main body is positioned in the box body 1, one end, far from the conductive contact point 31, of the main body is positioned outside the box body 1, and therefore, the bottom wall of the box body 1 forms certain isolation (see a first insulation protection area A) on the arc extinguishing device 2 and the part, far from the conductive contact point 31, of the main body of the fixed contact 3, so that the effect of reducing the electric breakdown risk is achieved, and the influence on the contact system in the breaking process is avoided.

The first inlet is sized to permit the breaking action of the moving contact 4, and in a preferred embodiment, the edge of the first inlet remote from the bottom wall forms a stop 14 capable of blocking the outward movement of the moving contact 4 during breaking. As shown in fig. 3 and 8, the operating mechanism 7 is located outside the front wall of the box body 1, that is, located at the left side of the box body 1 in fig. 8, after the moving contact 4 is separated from the fixed contact 3, the moving contact 4 moves outwards in the box body 1, that is, the moving contact 4 moves anticlockwise in fig. 8, when the moving contact 4 encounters the stop portion 14 of the box body 1, the moving contact 4 cannot continue to move outwards, so that a certain distance is kept between the moving contact 4 and the operating mechanism 7, and the moving contact 4 moving in the breaking process is prevented from being beaten to the operating mechanism 7, so that safety is provided.

As shown in fig. 1 and 2, in order to further improve the protection of other parts around the case 1, in this embodiment, the portions of the front wall located on both sides of the first inlet are formed with two opposite side baffles 12 outwardly of the case. The movable contact 4 passes through between the two side baffles 12 and then stretches into the first inlet, the side baffles 12 enlarge the shielding area of the box body 1 on the movable contact 4, and the function of preventing high-temperature gas from the first inlet from diffusing to two sides can be achieved, so that other parts around the box body 1 are better protected.

The exhaust holes may be formed in various manners, for example, in this embodiment, the exhaust holes are arranged in a grid structure, that is, the exhaust holes include elongated holes arranged along a certain direction. Of course, the vent holes may be provided to include a plurality of small holes in a shape of, for example, a circle, a rectangle, a triangle, etc. arranged in a lattice form.

In a preferred embodiment, the portion of the front wall on the side of the first inlet near the bottom wall extends inward of the box to form a cover plate 110 extending to the vicinity of the conductive contact point 31 of the stationary contact 3, and the cover plate 110 covers the portion of the main body of the stationary contact 3 near the conductive contact point 31. As shown in fig. 5 to 8, when the moving contact 4 is engaged with the fixed contact 3, that is, when the front end of the moving contact 4 contacts the conductive contact point 31 of the fixed contact 3, the near-arc surface 41 of the moving contact 4 is closer to the fixed contact 3, and when the moving contact 4 is disconnected from the fixed contact 3, the electric arc may move along the near-arc surface 41 toward the root of the moving contact 4, so that the continuous arcing phenomenon between the moving contact 4 and the fixed contact 3 is caused, and in order to avoid this phenomenon as much as possible, the part of the fixed contact 3, except the conductive contact point 31, in the arc extinguishing cavity C is covered as much as possible, for this reason, the inner side of the front wall of the box body 1 is provided with a cover plate 110, and the cover plate 110 is located at one side of the first inlet close to the bottom wall, as shown in the second insulation protection area B in fig. 7 and 8, so long as the cover plate 110 extends from the front wall of the box body 1 into the box body as the conductive contact point 31 is not covered. In order to be able to direct the breaking arc to a given position of the extinguishing device 2, for example to the bottom position of the extinguishing device 2, an arc striking angle 32 may be provided at the end of the stationary contact 3.

To facilitate the installation of the arc extinguishing device 2 in the case 1, the inner surface of the case 1 may be provided with grooves and/or protrusions for positioning the arc extinguishing device 2. As shown in fig. 3 and 4, in this embodiment, a positioning groove 13 is provided on a top wall of the case 1 opposite to the bottom wall, and can be matched with a positioning protrusion 21 on the top of the arc extinguishing device 2, so as to fix the arc extinguishing device 2. Of course, the grooves and/or protrusions for positioning the arc extinguishing device 2 may also be provided at other locations of the case 1, such as at the side walls, rear wall, bottom wall, etc.

In specific practical application, the deformation resistance of the box body 1 can be improved by arranging a rib structure, so that when the arc extinguishing cavity C is broken to generate high-temperature and high-pressure gas, the box body 1 is not easy to excessively deform, and the arc can be ensured to move according to a preset track. As shown in fig. 3 and 4, in this embodiment, two opposite side walls of the case 1 are each provided with a stopper rib 16 for reducing deformation on the outer surface. Of course, the limit rib 16 may be disposed on the inner surface of the side wall, and may be disposed at other positions of the case 1, such as the front wall, the rear wall, etc. In addition, the stopper rib 16 may be provided to extend in a lateral direction along the front wall to the rear wall, or may extend in an oblique direction, in addition to extending in a vertical direction along the top wall to the bottom wall. It should be understood that a plurality of stop bars 16 may be provided simultaneously extending in different directions, for example, two stop bars 16 disposed on the outer surface of the sidewall in a crisscross configuration.

In order to be able to support the conductive contact point 31 of the stationary contact 3, a support column can be provided in the housing 1 on the side of the stationary contact 3 facing away from the conductive contact point 31, which support column can be provided in particular by a component other than an arc extinguishing system, for example by a part of the base 6 described below as support column. As shown in fig. 3 and 7, in this embodiment, the bottom wall of the box 1 is provided with a third inlet through which the support column passes, and the third inlet is located at one side of the second inlet close to the rear wall and opposite to the conductive contact point 31 of the stationary contact 3. It should be noted that, the portion of the fixed contact 3 located outside the box body 1 is provided with a through hole through which the support column passes, that is, the support column passes through the through hole on the fixed contact 3 and the third inlet on the box body 1, and the portion of the fixed contact 3 located inside the box body 1 is connected to one end of the support column to be supported by the support column.

In order to reduce the parts of the box body 1 as much as possible, the utility model preferably makes the box body 1 assembled by two half boxes. As shown in fig. 3 to 6, in the present embodiment, the case 1 includes a first half case 101 and a second half case 102, wherein the first half case 101 is provided with an assembling groove 18 for the butt-joint, and the second half case 102 is provided with an assembling rib 17 for the butt-joint. In order to more firmly assemble the two half boxes together, the first half box 101 is provided with a nut mounting hole 19 matching the shape of the nut, the second half box 102 is provided with a bolt mounting hole 15 corresponding to the nut mounting hole 19, when assembling, the first half box 101 and the second half box 102 are buckled together, then the nut is put into the nut mounting hole 19, and the bolt is screwed from the bolt mounting hole 15 through the opposite nut.

As shown in fig. 3 to 8, the second inlet through which the main body of the fixed contact 3 passes and the third inlet through which the support column passes on the bottom wall of the box body 1 are formed by the butt joint of the hollow structures on the bottom walls of the first half box 101 and the second half box 102, and a part of the solid structure of the bottom wall exists between the second inlet and the third inlet.

It should be noted that, the arc extinguishing device 2 of the arc extinguishing system is shown in the drawings as an arc extinguishing gate by way of example, that is, the arc extinguishing system shown in the drawings adopts a gate arc extinguishing mode, it should be understood that the arc extinguishing system of the present utility model is also applicable to other arc extinguishing modes, such as magnetic arc extinguishing, slot arc extinguishing, etc., and thus, the arc extinguishing device 2 may be configured into other structural forms as required, and the present utility model is not limited thereto.

The utility model also provides a circuit breaker which comprises the arc extinguishing system disclosed in the embodiment. Since the arc extinguishing system disclosed in the above embodiment has the above technical effects, the circuit breaker having the arc extinguishing system also has the above technical effects, and will not be described herein again.

As shown in fig. 7 and 8, the circuit breaker includes a base 6 and a cover body that are detachably connected, the base 6 has an accommodating space for accommodating the arc extinguishing system, the top of the case 1 abuts against a limiting surface of the cover body, and the limiting surface is fixed to the case 1. In a preferred embodiment, the front end of the moving contact 4 of the circuit breaker is provided with a convex hull 42, the convex hull 42 is an enlarged part of the front end of the moving contact 4, and the convex hull 42 mainly has the following two roles: on the one hand, the convex hull 42 can better limit the stop part 14 of the box body 1 in the breaking process, so that the moving contact 4 is prevented from directly colliding with the operating mechanism 7; on the other hand, during the breaking process, a large amount of electric arcs can be generated to cause electric erosion to the moving contact 4, and the convex hull 42 can improve the ablation resistance of the moving contact 4, so that the breaking performance and the service life of the circuit breaker are improved.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides an arc extinguishing system of circuit breaker, its characterized in that, include the box body that insulating material made and be located arc extinguishing device in the box body, the box body has and is located respectively the front wall, the back wall and the diapire of arc extinguishing device's front side, rear side and bottom side, the first import that supplies the moving contact to wear to establish is seted up to the front wall, the gas vent has been seted up to the back wall, the diapire is close to the position of front wall has seted up the second import that supplies the stationary contact to wear to establish, the stationary contact includes the main part and is located the electrically conductive contact point of main part tip, electrically conductive contact point is located in the box body, the main part is kept away from electrically conductive contact point's one end is located outside the box body.

2. The arc extinguishing system according to claim 1, wherein a portion of the front wall on a side of the first inlet adjacent to the bottom wall extends inwardly of the case to form a shielding plate extending to a vicinity of the conductive contact point, the shielding plate covering a portion of the main body adjacent to the conductive contact point.

3. The arc extinguishing system according to claim 1, wherein the edge of the first inlet remote from the bottom wall forms a stop capable of blocking outward movement of the moving contact during breaking.

4. The arc suppression system of claim 1 wherein the portions of the front wall on either side of the first inlet are outwardly formed with opposing side guards.

5. The arc extinguishing system according to claim 1, wherein the case has a top wall opposite the bottom wall, the top wall being provided with grooves and/or protrusions for positioning the arc extinguishing device.

6. The arc extinguishing system according to claim 1, wherein the case has two opposite side walls, and the inner and/or outer surfaces of the side walls are provided with a stopper rib for reducing deformation.

7. The arc extinguishing system according to claim 1, wherein the exhaust port is provided in a grid structure.

8. The arc extinguishing system according to claim 1, wherein the bottom wall is provided with a third inlet through which the support column passes, the third inlet being located on a side of the second inlet near the rear wall and opposite to the conductive contact point of the stationary contact.

9. The arc extinguishing system according to any one of claims 1 to 8, wherein the case body comprises two half cases, one of the two half cases being provided with an assembly rib for a butt-joint connection, the other one being provided with an assembly groove for a butt-joint connection.

10. A circuit breaker comprising an arc extinguishing system according to any one of claims 1 to 9.