Moving contact and electrical switch equipment

Abstract

The utility model provides a moving contact and an electrical switch device, and the moving contact comprises a contact finger which comprises a first end, a second end and a contact surface, and the contact surface is located between the first end and the second end; and the lead comprises a connecting part, and the end surface of the connecting part is aligned with and welded with the end surface of the first end of the contact finger. The end face of the connecting part and the end face of the first end of the contact finger are aligned and welded, so that the connecting structure of the contact finger and the wire can be simplified, the production process of the moving contact can be simplified, the length of the wire and / or the contact finger can be shortened, the use amount of materials can be reduced, and the service life of the moving contact can be prolonged under the condition that the performance of the moving contact is not affected. And the production cost of the moving contact is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical switch technology, and in particular to a moving contact and electrical switch device. Background Technology

[0002] Electrical switchgear is a key electrical component used to control, protect, and regulate current flow, playing a vital role in power systems, industrial automation, and building electrical systems. Electrical switchgear includes circuit breakers, contactors, relays, etc., each responsible for protecting circuits, remote control, and frequently connecting or disconnecting circuits.

[0003] As a core movable component in electrical switching equipment, the moving contact plays a crucial role in contactors and relays. The moving contact is used to make contact with or separate from the stationary contact during switching operations, thereby connecting or disconnecting the circuit. Figure 1 A schematic diagram of a moving contact 100 in the related art is shown. The moving contact 100 includes a contact finger 110. Figure 1 The complete contact finger 110 (not shown) and wire 120 are provided, and a groove is provided on the side of the contact finger 110. Figure 1 (Not shown in the image), one end of the conductor 120 overlaps in the groove and is connected to the contact finger 110 by welding. The contact finger 110 and conductor 120 are typically made of copper or copper alloys, materials chosen for their excellent conductivity, wear resistance, and corrosion resistance to ensure the performance and lifespan of the electrical switching equipment. Although the moving contact 100 exhibits good electrical performance, its structure is relatively complex, and the large amount of material used in the contact finger 110 results in higher costs.

[0004] In the field of electrical switch technology, how to reduce the production cost of moving contacts while maintaining or improving their performance has become an urgent technical problem to be solved.

[0005] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Utility Model Content

[0006] To address one or more deficiencies in the prior art, this utility model provides a moving contact, comprising:

[0007] A finger, comprising a first end, a second end, and a contact surface, wherein the contact surface is located between the first end and the second end; and

[0008] The wire includes a connecting portion, the end face of which is aligned with and welded to the end face of the first end of the contact finger.

[0009] According to one aspect of the present invention, the first end of the finger is provided with one or two chamfers.

[0010] According to one aspect of the present invention, the thickness of the touch finger is the same as the thickness of the connecting portion.

[0011] According to one aspect of the present invention, the touch finger further includes a first side and a second side, wherein the contact surface is disposed on the first side and the contact surface is a silver dot.

[0012] According to one aspect of the present invention, one or more grooves are provided on the second side of the finger.

[0013] According to one aspect of the present invention, an arc-guiding protrusion is provided on the second side of the touch finger, the arc-guiding protrusion being close to the second end of the touch finger.

[0014] According to one aspect of the present invention, a through hole is provided in the middle of the finger.

[0015] According to one aspect of the present invention, a notch is provided on the first side, the notch being closer to the through hole than the contact surface.

[0016] According to one aspect of the present invention, the conductor includes two braided wires, the two ends of which are aligned and welded to form the connection portion.

[0017] This utility model also provides an electrical switchgear, including the moving contact as described above.

[0018] Compared with related technologies, the embodiments of this utility model provide a moving contact and an electrical switching device. By aligning and welding the end face of the connecting part with the end face of the first end of the contact finger, the connection structure between the contact finger and the wire can be simplified, the manufacturing process of the moving contact can be simplified, and the length of the wire and / or the contact finger can be shortened, reducing the amount of material used. Thus, the production cost of the moving contact can be reduced while maintaining the performance of the moving contact.

[0019] By setting a chamfer at the first end of the contact finger, stress concentration on the contact finger can be reduced, the amount of material used to make the contact finger can be reduced, and thus the production cost of the moving contact can be reduced.

[0020] By incorporating silver dots on the contact surface, energy loss due to poor contact can be reduced, the service life of the moving contact can be extended, and the stability and efficiency of the entire electrical switchgear can be improved.

[0021] By setting arc-guiding protrusions on the contact fingers, the electric arc can be effectively guided during switch operation (especially when the contact fingers are separated from the stationary contact), reducing the erosion of the contact finger material by the electric arc and extending the service life of the contact fingers. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 A schematic diagram of a moving contact in the related art is shown;

[0024] Figure 2 A schematic diagram of a moving contact according to an embodiment of the present invention is shown. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] Figure 2 A schematic diagram of a moving contact 200 according to an embodiment of the present invention is shown below, in conjunction with... Figure 2 Provide a detailed description.

[0032] like Figure 2 As shown, the moving contact 200 includes a contact finger 210 and a wire 220. The contact finger 210 and the wire 220 can be made of metal materials such as copper or copper alloys to give the moving contact 200 good electrical conductivity, thermal conductivity, corrosion resistance, and mechanical strength. This ensures that the moving contact 200 maintains optimal performance even under harsh working conditions, thereby effectively extending its service life. The contact finger 210 includes a first end 211 (… Figure 2 (right end of the middle), second end 212 ( Figure 2The left end of the contact finger 210 and the contact surface 213 are located between the first end 211 and the second end 212. The contact surface 213 is used to contact or separate from the stationary contact during the switching operation, thereby realizing the connection or disconnection of the circuit. The wire 220 includes a connecting part 221, the end face of the connecting part 221 is aligned with the end face of the first end 211 of the contact finger 210 and welded (i.e., the connecting part 221 and the first end 211 of the contact finger 210 are butt-welded). By using butt welding to connect the wire 220 and the contact finger 210, the wire 220 and the contact finger 210 do not need to overlap, which helps to shorten the length of the wire 220 and / or the contact finger 210, reduce the amount of material used, and reduce production costs. In addition, using butt welding to connect the wire 220 and the contact finger 210 can ensure the reliability of the electrical connection, ensure that the performance of the moving contact 200 is basically unaffected, and also reduce the complexity of the connection part and simplify the manufacturing process of the moving contact 200.

[0033] According to one embodiment of the present invention, one or two chamfers may be provided at the first end 211 of the touch finger 210, for example, in Figure 2 In the illustrated embodiment, the first end 211 of the contact finger 210 is provided with two chamfers, such that the end face of the first end 211 of the contact finger 210 is located between the two chamfers. By providing chamfers at the first end 211 of the contact finger 210, the amount of material used in manufacturing the contact finger 210 can be reduced, thereby reducing the production cost of the moving contact 200. In addition, the chamfers can also reduce stress concentration on the contact finger 210, thereby reducing the risk of breakage of the contact finger 210.

[0034] According to one embodiment of the present invention, such as Figure 2 As shown, the thickness of the contact finger 210 (i.e., the thickness of the first end 211 of the contact finger 210) is the same as the thickness of the connecting portion 221. Optionally, the width of the first end 211 of the contact finger 210 is the same as the width of the connecting portion 221. This arrangement facilitates the welding of the contact finger 210 and the connecting portion 221, resulting in a larger contact area between them. This ensures the connection strength between the contact finger 210 and the connecting portion 221 and reduces the contact resistance between them.

[0035] According to one embodiment of the present invention, such as Figure 2 As shown, the finger 210 also includes a first side 214 ( Figure 2 (lower side) and second side 215 ( Figure 2The contact surface 213 is disposed on the first side 214 of the contact finger 210 (upper side). Specifically, a protrusion is provided on the first side 214 of the contact finger 210, and the lower surface of the protrusion is the contact surface 213. Preferably, silver dots can also be provided on the lower surface of the protrusion, forming the contact surface 213. Silver, as a metal with high conductivity and low contact resistance, can reduce energy loss caused by poor contact, extend the service life of the moving contact 200, and improve the stability and efficiency of the entire electrical switchgear when used as the contact surface 213.

[0036] According to one embodiment of the present invention, such as Figure 2 As shown, one or more grooves 216 are provided on the second side 215 of the contact finger 210. The grooves 216 can be used to cooperate with the contact finger spring in the electrical switchgear to realize the disconnection function.

[0037] According to one embodiment of the present invention, such as Figure 2 As shown, an arc-inducing protrusion 217 is provided on the second side 215 of the contact finger 210, and the arc-inducing protrusion 217 is close to the second end 212 of the contact finger 210. The arc-inducing protrusion 217 can guide the arc during the switching operation (especially when the contact finger 210 is separated from the stationary contact), for example, guiding the arc to the arc-extinguishing chamber to extinguish the arc and reduce the burning of the silver point (contact surface 213).

[0038] According to one embodiment of the present invention, such as Figure 2 As shown, a through hole 218 is provided in the middle of the contact finger 210, through which the contact finger 210 can be hinged to a pivot in an electrical switching device. Optionally, a notch 219 can be provided on the first side 214 of the contact finger 210. The notch 219 is approximately located between the contact surface 213 and the through hole 218. The notch 219 is closer to the through hole 218 than the contact surface 213. The notch 219 has a foolproof function and can be used to distinguish similar materials.

[0039] According to one embodiment of the present invention, such as ​ As shown, the conductor 220 may include two braided wires 222. The braided wires 222 are cables woven from multiple metal wires (e.g., copper wires). This structure not only gives it excellent conductivity but also superior flexibility. The two ends of the braided wires 222 are precisely aligned and fixed by welding, so that both ends of the conductor 220 can be used as connection parts 221, greatly facilitating the assembly of the moving contact 200 (i.e., welding the contact finger 210 to the conductor 220). The middle of the two braided wires 222 can move freely, giving the conductor 220 good flexibility, thereby reducing the impact of the conductor 220 on the contact finger 210 during switching operation. This helps ensure that the contact finger 210 can move accurately into position, thus improving the operating accuracy and reliability of the electrical switching equipment.

[0040] An embodiment of this utility model also provides an electrical switching device, which may be a contactor, relay, air circuit breaker, molded case circuit breaker, etc., and the electrical switching device includes the moving contact 200 as described above.

[0041] Compared with related technologies, the embodiments of this utility model provide a moving contact 200 and an electrical switching device. By aligning and welding the end face of the connecting part 221 with the end face of the first end 211 of the contact finger 210, the connection structure between the contact finger 210 and the wire 220 can be simplified, the manufacturing process of the moving contact 200 can be simplified, and the length of the wire 220 and / or the contact finger 210 can be shortened, reducing the amount of material used. This reduces the production cost of the moving contact 200 without affecting its performance. By providing a chamfer at the first end 211 of the contact finger 210, stress concentration on the contact finger 210 can be reduced, reducing the amount of material used in manufacturing the contact finger 210, thereby reducing the production cost of the moving contact 200. By providing silver dots on the contact surface 213, energy loss caused by poor contact can be reduced, the service life of the moving contact 200 can be extended, and the stability and efficiency of the entire electrical switching device can be improved. By providing an arc-inducing protrusion 217 on the contact finger 210, the electric arc can be effectively guided during the switching operation (especially when the contact finger 210 is separated from the stationary contact), reducing the erosion of the contact finger 210 material by the electric arc and extending the service life of the contact finger 210.

[0042] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A moving contact, characterized in that, include: The finger includes a first end, a second end, and a contact surface, wherein the contact surface is located between the first end and the second end; and The wire includes a connecting portion, the end face of which is aligned with and welded to the end face of the first end of the contact finger.

2. The moving contact according to claim 1, characterized in that, The first end of the finger is provided with one or two chamfers.

3. The moving contact according to claim 1, characterized in that, The thickness of the finger is the same as the thickness of the connecting portion.

4. The moving contact according to claim 1, characterized in that, The touch finger also includes a first side and a second side, wherein the contact surface is disposed on the first side and the contact surface is a silver dot.

5. The moving contact according to claim 4, characterized in that, One or more grooves are provided on the second side of the finger.

6. The moving contact according to claim 4, characterized in that, An arc-guiding protrusion is provided on the second side of the finger, and the arc-guiding protrusion is close to the second end of the finger.

7. The moving contact according to claim 4, characterized in that, A through hole is provided in the middle of the finger.

8. The moving contact according to claim 7, characterized in that, The first side is provided with a notch, which is closer to the through hole than the contact surface.

9. The moving contact according to claim 1, characterized in that, The conductor comprises two braided wires, the ends of which are aligned and welded together to form the connection portion.

10. An electrical switchgear, characterized in that, Includes the moving contact as described in any one of claims 1-9.

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