Contact matching structure of electrical switch

Abstract

The present invention discloses a contact matching structure of an electrical switch, including a static contact and a moving contact parallel to each other, an arc contact and a main contact being arranged on the moving contact, the arc contact being located at the outer end of the moving contact, and an angle being formed between the edges of one side of the static contact and the moving contact that are close to each other in the open state, so that the arc contact contacts the static contact before the main contact during the closing process. The arc contact of the moving contact of the present invention contacts the static contact first when closing the switch, and is disconnected last when opening the switch, so that most of the burnout is concentrated on the arc contact, and the position of the ablation point of the moving contact is effectively controlled; the pit design of the static contact increases the safety margin of the slag accumulation of the arc contact exceeding the height of the main contact, and increases the closing reliability; the space in the moving contact movement direction is not occupied, so that the space utilization rate in the moving contact movement direction is higher, the design opening distance is increased, and the product performance is improved.

Description

Technical Field

[0001] The invention belongs to the field of isolating switches, and in particular relates to a contact matching structure of an electrical switch. Background Art

[0002] Isolating switch is a switch device that is mainly used for "isolating power supply, switching operation, connecting and disconnecting small current circuits" and has no arc extinguishing function. When the isolating switch is in the open position, there is an insulation distance that meets the specified requirements and an obvious disconnection mark between the contacts; when in the closed position, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time.

[0003] In the existing translational disconnectors, the static contact is generally fixed on the base, and the moving contact is installed on the slidable slider. The sliding of the slider separates and closes the static and moving contacts to realize the on and off of the switch. The existing translational disconnectors have the following defects: 1. When the static and moving contacts are in contact and closed, they are generally in line contact or a plane contact, and their electrical wear position is uncontrollable, resulting in unstable test after test; 2. Due to contact ablation and slag accumulation, the closing is unreliable; 3. Some products have arc-starting sharp corners, but they occupy the space in the direction of movement of the moving contact, the design opening distance is reduced, and the product performance is limited. Summary of the invention

[0004] In order to solve the technical problem that the electrical wear position of the moving and static contacts is uncontrollable when they are in contact and closed, resulting in unstable tests after tests, the present invention provides a contact matching structure for an electrical switch, so that most of the burnout is concentrated on the arc contact to control the position of the contact ablation point.

[0005] To this end, the technical solution adopted by the present invention is: a contact matching structure of an electrical switch, including a static contact and a moving contact, the contact and separation of the static contact and the moving contact realize the on and off of the electrical switch, the moving contact is provided with an arc contact and a main contact, and is characterized in that: there is an angle between the contact surfaces on one side corresponding to the static contact and the moving contact, so that the arc contact contacts the static contact before the main contact during the closing process.

[0006] Preferably, the arc contact is located at the outer end of the moving contact.

[0007] Preferably, a groove adapted to the arc contact is provided on the static contact, and when the static contact and the moving contact are closed, the arc contact is located in the groove. With the above structure, the groove increases the safety margin of the slag accumulation of the arc contact exceeding the height of the main contact, thereby improving the closing reliability.

[0008] Preferably, a notch is provided on the side edge of the moving contact, and the notch is located between the arc contact and the main contact. With the above structure, the contact area between the moving contact and the static contact when they are just in contact and when they are finally disconnected can be reduced as much as possible, and the time when the arc contact and the static contact are in separate contact can be extended.

[0009] Preferably, the edges of the static contact and the moving contact that are close to each other in the open state are both chamfered. The above structure facilitates smooth insertion of the static contact and the moving contact.

[0010] The beneficial effects of the present invention are as follows: the arc contact of the moving contact contacts the static contact first when closing the circuit breaker and is disconnected last when opening the circuit breaker, so that most of the burning loss is concentrated on the arc contact, and the position of the burning point of the moving contact is effectively controlled; the pit design of the static contact increases the safety margin of the slag accumulation of the arc contact exceeding the height of the main contact, thereby increasing the closing reliability; the space in the moving contact's movement direction is not occupied, so that the space utilization rate in the moving contact's movement direction is higher, the design opening distance is increased, and the product performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A top view of an embodiment of the present invention;

[0012] Figure 2 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0014] like Figure 1 and Figure 2 As shown, a contact matching structure of an electrical switch is composed of a stationary contact 1 and a moving contact 2. The stationary contact 1 is fixed on a base, and the moving contact 2 is mounted on a sliding slider. The moving contact 2 is driven by the slider to approach or move away from the stationary contact 1, thereby realizing closing or opening. The edges of the stationary contact 1 and the moving contact 2 that are close to each other are both chamfered. An arc contact 201 and a main contact 202 are provided on the moving contact 2, and the arc contact 201 is located at the outer end of the moving contact 2. There is an angle between the contact surfaces on one side corresponding to the stationary contact 1 and the moving contact 2, so that the arc contact 201 contacts the stationary contact 1 before the main contact 202 during the closing process, and the arc contact 201 is disconnected from the stationary contact 1 last during the opening, so that most of the burnout is concentrated on the arc contact 201.

[0015] like Figure 1 and Figure 2 As shown, a notch 203 is provided on the edge of the moving contact 2 corresponding to the side close to the stationary contact 1, and the notch 203 is located between the arc contact 201 and the main contact 202. The setting of the notch 203 prolongs the individual contact time between the arc contact 201 and the stationary contact 1, and further controls the position of the ablation point of the moving contact 2.

[0016] like Figure 1 and Figure 2 As shown, the stationary contact 1 is provided with a groove 101 adapted to the arc contact 201, and the groove 101 extends from the middle of the stationary contact 1 in a direction away from the moving contact 2, so as to prevent the arc contact 201 of the moving contact 2 from directly entering the groove 101 when just in contact with the stationary contact 1, resulting in inadequate contact. When in the closed state, the arc contact 201 of the moving contact 2 is just located in the groove 101. The slag of the arc contact 201 accumulates in the groove 101, which can prevent the slag from padding the arc contact 201 and causing unreliable closing.

[0017] The beneficial effects of the present invention are as follows: the arc contact of the moving contact contacts the static contact first when closing the circuit breaker and is disconnected last when opening the circuit breaker, so that most of the burning loss is concentrated on the arc contact, and the position of the burning point of the moving contact is effectively controlled; the pit design of the static contact increases the safety margin of the slag accumulation of the arc contact exceeding the height of the main contact, thereby increasing the closing reliability; the space in the moving contact's movement direction is not occupied, so that the space utilization rate in the moving contact's movement direction is higher, the design opening distance is increased, and the product performance is improved.

[0018] The structures, proportions, sizes, quantities, etc. illustrated in the accompanying drawings of the embodiments of the present invention are only used to match the contents disclosed in the specification so as to be understood and read by those familiar with the technology, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects that the present invention can produce and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. cited in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

Claims

1. A contact matching structure of an electrical switch, comprising a stationary contact (1) and a moving contact (2), wherein the contact and separation of the stationary contact (1) and the moving contact (2) realize the on and off of the electrical switch, and the moving contact (2) is provided with an arc contact (201) and a main contact (202), characterized in that: An angle is formed between the contact surfaces on one side corresponding to the static contact (1) and the moving contact (2), so that the arc contact (201) contacts the static contact (1) before the main contact (202) during the closing process; The arc contact (201) is located at the outer end of the moving contact (2); A notch (203) is provided on the side edge of the moving contact (2), and the notch (203) is located between the arc contact (201) and the main contact (202). The provision of the notch (203) prolongs the single contact time between the arc contact (201) and the stationary contact (1), and further controls the position of the ablation point of the moving contact (2); The stationary contact (1) is provided with a groove (101) adapted to the arc contact (201); the groove (101) extends from the middle of the stationary contact (1) in a direction away from the moving contact (2), thereby preventing the arc contact (201) of the moving contact (2) from directly entering the groove (101) when it first contacts the stationary contact (1), thereby causing inadequate contact; when the stationary contact (1) and the moving contact (2) are closed, the arc contact (201) is located in the groove (101), and slag of the arc contact (201) accumulates in the groove (101), thereby preventing the slag from raising the arc contact (201).

2. The contact matching structure of the electrical switch according to claim 1, characterized in that: The static contact (1) and the moving contact (2) both have chamfers on their edges that are close to each other in the open state.

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