Contact system and switching device

Abstract

The utility model relates to a contact system and a switching device, the contact system comprises a static contact and a moving contact, the moving contact has a motion trail relatively close to or far away from the static contact, a first side of the motion trail is used for configuring an arc extinguishing device, the moving contact part also comprises a contact cover, the contact cover comprises a blocking surface, and the blocking surface is used for blocking the arc extinguishing device. The other side deviating from the first side of the motion trail is defined as a second side, and the blocking surface is implemented as follows: when the contact system is in a disconnected state, the blocking surface is located at the position of the second side of the motion trail and faces the motion trail; an uneven structure is arranged on the blocking face in the track extending direction of the movement track. The uneven structure can increase the creepage distance and reduce the risk of surface breakdown of the switching device. Moreover, after the electric arc is generated, the electric arc can deviate towards the direction of the blocking surface due to the inertia of the electric arc, and at the moment, the uneven structure can lengthen and twist the electric arc, improve the electric arc voltage and enhance the breaking capacity of the circuit breaker.

Description

Technical Field

[0001] The utility model relates to the field of switch electrical appliances, in particular to the improvement of a contact system. Background Art

[0002] When a circuit breaker trips, the initial spacing between the moving and stationary contacts is small, while the electric field strength is high. This generates an arc between the moving and stationary contacts. If the arc is not extinguished, the circuit cannot be fully disconnected. Furthermore, the arc temperature is very high, which can damage equipment and cause serious accidents. Therefore, improving the breaking capacity of circuit breakers is a key research topic for those skilled in the art. Currently, improvements to the arc extinguishing device are typically made to the breaking capacity of circuit breakers, and structural designs that enhance the breaking capacity of circuit breakers beyond the arc extinguishing device are rare. Utility Model Content

[0003] In view of the above problems, the present invention proposes a contact system capable of improving the breaking capacity of a switching electrical appliance, and based on the contact system, also proposes a switching electrical appliance having the contact system.

[0004] The utility model is implemented by the following technical solutions:

[0005] The present invention proposes a contact system, including a static contact part and a dynamic contact part, the static contact part including a static contact, the dynamic contact part including a dynamic contact corresponding to the static contact, the dynamic contact having a motion trajectory relatively close to or away from the static contact, so as to realize contact conduction or disconnection of the contact system, the first side of the motion trajectory is used to configure an arc extinguishing device, the dynamic contact part also includes a contact cover, the contact cover includes a blocking surface, and the other side away from the first side of the motion trajectory is defined as the second side, and the blocking surface is implemented as follows: when the contact system is disconnected, the blocking surface is located at the second side of the motion trajectory and faces the motion trajectory; along the trajectory extension direction of the motion trajectory, an uneven structure is provided on the blocking surface.

[0006] In one embodiment, preferably, the uneven structure includes a plurality of groove units, the groove extension direction of each groove unit intersects with the track extension direction of the motion track, and the plurality of groove units are arranged at intervals approximately along the track extension direction of the motion track.

[0007] In one embodiment, preferably, an intersection angle between an extension direction of the groove of the groove unit and an extension direction of the motion track is 90 degrees.

[0008] In one embodiment, preferably, the groove extends in a strip shape.

[0009] In one embodiment, preferably, along the extension direction of the motion track, the span range of the blocking surface is greater than the span range of the motion track.

[0010] In one embodiment, preferably, the contact cover / barrier surface is made of an insulating gas-generating material.

[0011] In one embodiment, preferably, the dynamic contact portion further includes a contact seat and a conductive sheet, the contact seat is configured to be movable, the conductive sheet and the contact cover are both positioned and connected to the contact seat, and the dynamic contact is provided on the conductive sheet.

[0012] Based on the above-mentioned contact system, the present invention further proposes a switching electrical appliance, comprising a contact system and an arc extinguishing device, wherein the contact system is the above-mentioned contact system.

[0013] In one embodiment, preferably, the switching electrical device is a circuit breaker.

[0014] This utility model has the following beneficial effects: the uneven structure on the barrier surface increases creepage distance and reduces the risk of surface breakdown of the switch. Furthermore, when an arc is generated, due to its inertia, the arc will deviate toward the barrier surface. At this time, the uneven structure can stretch and distort the arc, increase the arc voltage, and enhance the circuit breaker's breaking capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view of a switch electrical device in an embodiment;

[0016] Figure 2 is a schematic diagram of a static contact portion and a dynamic contact portion in an embodiment;

[0017] Figure 3 is a three-dimensional schematic diagram of a contact cover in an embodiment;

[0018] Figure 4 is a side view of the contact cover in the embodiment;

[0019] Figure 5 yes Figure 4 Cross-sectional view at AA in the middle. DETAILED DESCRIPTION

[0020] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0021] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0022] See Figure 1 、 2 As shown, as a preferred embodiment of the present invention, a switching device is provided, specifically a circuit breaker, including a contact system and an arc extinguishing device 10. The contact system includes a static contact portion 1 and a dynamic contact portion 2. The static contact portion 1 is fixedly arranged and is provided with a static contact 11. The dynamic contact portion 2 includes a contact base 21, a conductive sheet 22, and a contact cover 23. The contact base 21 is configured to be movable. For example, in this embodiment, the contact base 21 is rotatable. The conductive sheet 22 and the contact cover 23 are both positioned and connected to the contact base 21. Therefore, when the contact base 21 rotates, the conductive sheet 22 and the contact cover 23 also rotate accordingly. A dynamic contact 221 is provided on the conductive sheet 22. The dynamic contact 221 corresponds to the static contact 11. When the contact base 21 rotates, the dynamic contact 221 has a motion trajectory F that is relatively close to or away from the static contact 11, so as to achieve contact connection or disconnection of the contact system. The arc extinguishing device 10 is arranged on the first side of the motion trajectory F, and the arc E generated when the moving contact 221 and the static contact 11 are disconnected is introduced into the arc extinguishing device 10 through the arc striking plate, thereby performing arc extinguishing processing.

[0023] The contact cover 23 includes a blocking surface 231, which extends from a side of the contact base 21 close to the movable contact portion 2 toward the stationary contact portion 1. The blocking surface 231 is configured such that, when the contact system is in the disconnected state, the blocking surface 231 is located at a second side of the motion trajectory F that is away from the first side and faces the motion trajectory F. Thus, with respect to the disconnecting spacing between the movable contact 221 and the stationary contact 11, when the contact system is in the disconnected state, the blocking surface 231 blocks an end of the disconnecting spacing away from the arc extinguishing device 10.

[0024] Along the extension direction of the motion track F, an uneven structure is provided on the blocking surface 231. Figure 3-5 In this embodiment, the uneven structure includes a plurality of groove units 230, the groove extension direction of each groove unit 230 intersects with the track extension direction of the motion track F, and the plurality of groove units 230 are arranged at intervals substantially along the track extension direction of the motion track F. Figure 1 This uneven structure increases the creepage distance and reduces the risk of surface breakdown in the circuit breaker. Furthermore, once the arc E is generated, due to its inertia, it deviates toward the blocking surface 231. The uneven structure on the contact cover 23 stretches and distorts the arc E, increasing the arc voltage and enhancing the circuit breaker's breaking capacity.

[0025] It is worth noting that since the groove unit 230 only needs to form an uneven structure in the trajectory extension direction of the motion trajectory F, the several groove units 230 can be accurately arranged at intervals along the trajectory extension direction of the motion trajectory F, or can be arranged in a direction slightly offset from the trajectory extension direction of the motion trajectory F. For example, in the present embodiment, the arrangement direction of the several groove units 230 is an arc shape that coincides with the trajectory extension direction of the motion trajectory F, but in other embodiments, the arrangement direction of the several groove units 230 can also be horizontally arranged. In short, the several groove units 230 can be roughly arranged at intervals along the trajectory extension direction of the motion trajectory F.

[0026] In this embodiment, the groove unit 230 extends in a strip shape to expand the unevenness of the uneven structure and ensure that the uneven structure can contact the arc E. In addition, in this embodiment, the intersection angle between the groove extension direction of the groove unit 230 and the extension direction of the motion trajectory F is 90 degrees, which facilitates manufacturing. In other embodiments, the groove extension direction of the groove unit 230 and the extension direction of the motion trajectory F can also be inclined to each other. In short, as long as the groove extension direction of the groove unit 230 intersects the extension direction of the motion trajectory F, it is sufficient.

[0027] As long as the uneven structure forms an uneven shape along the extension direction of the motion trajectory F, it can achieve the effect of lengthening the arc. Therefore, in addition to the uneven structure composed of groove units 230 in this embodiment, other uneven structures can be used in other embodiments to replace it, such as sawtooth or wavy uneven structures, or each groove unit 230 can be replaced with a strip-shaped protrusion, or the uneven structure can be a whole convex surface or concave surface, or a plurality of protrusion / groove structures densely distributed in a dot matrix.

[0028] In this embodiment, the entire contact cover 23 or only the barrier surface 231 is made of an insulating gas-generating material such as nylon, melamine, or POM. When the arc E erodes the insulating gas-generating material, a large amount of gas is generated, which can push the arc E toward the arc extinguishing device 10. The arc E is inherently twisted under the influence of the uneven structure. After the arc E is pushed, the twisted parts of the arc E are further stretched toward the arc extinguishing device 10, thereby further enhancing the breaking capacity of the circuit breaker. Because the barrier surface 231 blocks the end of the breaking spacing away from the arc extinguishing device 10, it can also prevent excessive gas from dispersing in a direction away from the arc extinguishing device 10. Since the barrier surface 231 is provided with an uneven structure, its gas-generating area is also larger, and more gas can be generated.

[0029] In this embodiment, along the extension direction of the motion trajectory F, the span range G of the blocking surface 231 is greater than the span range H of the motion trajectory F. Such a setting can increase the area available for setting uneven structures, and then set more uneven structures to improve the breaking capacity.

[0030] In addition to circuit breakers, the contact system provided in this embodiment can also be used in other switching electrical appliances, such as disconnectors.

[0031] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims shall fall within the scope of protection of the present invention.

Claims

1. A contact system, comprising a static contact part and a dynamic contact part, wherein the static contact part comprises a static contact, and the dynamic contact part comprises a dynamic contact corresponding to the static contact, wherein the dynamic contact has a motion trajectory relatively close to or away from the static contact to achieve contact connection or disconnection of the contact system, wherein the first side of the motion trajectory is used to configure an arc extinguishing device, and wherein: The dynamic contact portion also includes a contact cover, which includes a blocking surface, and the other side away from the first side of the motion trajectory is defined as the second side. The blocking surface is implemented as follows: when the contact system is disconnected, the blocking surface is located on the second side of the motion trajectory and faces the motion trajectory; along the trajectory extension direction of the motion trajectory, an uneven structure is provided on the blocking surface.

2. The contact system according to claim 1, characterized in that: The uneven structure includes a plurality of groove units, the groove extension direction of each groove unit intersects with the track extension direction of the motion track, and the plurality of groove units are arranged at intervals substantially along the track extension direction of the motion track.

3. The contact system according to claim 2, characterized in that: An intersection angle between an extension direction of the groove of the groove unit and an extension direction of the motion track is 90 degrees.

4. The contact system according to claim 2, characterized in that: The groove extends in a strip shape.

5. The contact system according to claim 1, characterized in that: Along the extension direction of the motion trajectory, the span range of the blocking surface is greater than the span range of the motion trajectory.

6. The contact system according to claim 1, characterized in that: The contact cover / barrier surface is made of insulating gas generating material.

7. The contact system according to claim 1, characterized in that: The moving contact part further comprises a contact seat and a conductive sheet. The contact seat is configured to be movable. The conductive sheet and the contact cover are both positioned and connected to the contact seat. The moving contact is arranged on the conductive sheet.

8. A switchgear, comprising a contact system and an arc extinguishing device, characterized in that: The contact system is the contact system described in any one of claims 1-7.

9. The switch device according to claim 8, characterized in that: The switching device is a circuit breaker.

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