Moving contact connecting plate, moving contact assembly and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to a moving contact connecting plate, a moving contact assembly and a circuit breaker. The moving contact connecting plate comprises a connecting plate body; the first protective layer covers the surface of the connecting plate body; the second protective layer covers the first protective layer; the third protective layer wraps the second protective layer; wherein the first protective layer comprises a copper layer, the third protective layer comprises a silver layer, and the second protective layer comprises a nickel graphene composite layer. The connecting plate body is not prone to being corroded, the connecting plate body can be made of materials with relatively low price, the combining capacity and the electric conduction capacity of all the layers are good, and high electric conductivity, high corrosion resistance and low production cost are achieved at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a moving contact connecting plate, a moving contact assembly and a circuit breaker. Background Art

[0002] The moving contact is an important part of the circuit breaker, and the connecting plate is a part used to connect the moving contact with the busbar and other parts and conduct electricity. In order to achieve good conductivity and corrosion resistance, some products currently use copper to make the connecting plate. Copper is a high-purity copper material with a copper content of more than 99%, which has good conductivity and corrosion resistance. However, the raw material price of copper is high, which leads to high production costs of the connecting plate. Utility Model Content

[0003] The present application aims to provide a moving contact connecting plate, a moving contact assembly and a circuit breaker, so as to reduce the production cost of the moving contact connecting plate, while taking into account good corrosion resistance and maintaining good conductivity.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a moving contact coupling plate, comprising:

[0006] Connecting plate body;

[0007] A first protective layer covering the surface of the connecting plate body;

[0008] A second protective layer, covering the first protective layer;

[0009] a third protective layer, covering the second protective layer;

[0010] Wherein, the first protective layer includes a copper layer, the third protective layer includes a silver layer, and the second protective layer includes a nickel-graphene composite layer.

[0011] In the above technical solution, the copper layer as the first protective layer and the silver layer as the third protective layer can both enhance the corrosion resistance of the connecting plate body. The nickel graphene layer as the middle second protective layer can isolate the copper layer and the silver layer, avoiding the problem of silver-copper replacement caused by directly plating the silver layer on the copper layer. At the same time, nickel also plays the role of connecting the copper layer and the silver layer, improving the bonding strength and avoiding the problem of peeling due to weak bonding strength.

[0012] The silver layer, as the outermost third protective layer, has a good anti-oxidation effect and can further delay the corrosion process. When the silver layer is corroded, since the corrosion potentials of copper and silver are higher than that of the nickel-graphene composite layer, the corrosion direction will change from longitudinal corrosion to lateral corrosion, making the corrosion behavior mainly concentrated in the middle second protective layer, thereby making the first protective layer and the connecting plate body less susceptible to corrosion, thereby improving the corrosion resistance of the connecting plate.

[0013] In addition, copper, silver and graphene all have excellent conductive properties. Graphene connects copper and silver, which enhances the conductivity of the connecting plate. Moreover, the role of graphene in filling the gaps can further reduce resistance, improve conductivity, and reduce safety hazards caused by heat, thereby improving the safety of the circuit breaker.

[0014] Therefore, under the action of the first protective layer, the second protective layer and the third protective layer, the connecting plate provided by the technical solution of the present application has good conductivity and corrosion resistance, and the connecting plate body can be made of relatively low-cost materials, thereby reducing the production cost of the moving contact connecting plate, while taking into account good corrosion resistance and maintaining good conductivity.

[0015] In one embodiment of the present application, the thickness of the first protective layer is greater than that of the third protective layer.

[0016] In the above technical solution, the thickness of the relatively more corrosion-resistant third protective layer does not need to be set too thick, as long as it can resist and delay corrosion, which can further reduce production costs; by making the thickness of the first protective layer thicker, the innermost connecting plate body can have a better anti-corrosion effect.

[0017] In one embodiment of the present application, the thickness of the second protective layer is greater than that of the third protective layer.

[0018] In the above technical solution, by making the second protective layer thicker, the process of lateral corrosion of the second protective layer is longer, and the second protective layer is not easily corroded.

[0019] In one embodiment of the present application, the thickness of the first protective layer is 2-4 μm.

[0020] In one embodiment of the present application, the thickness of the second protective layer is 2-5 μm.

[0021] In one embodiment of the present application, the thickness of the third protective layer is 0.3-0.6 μm.

[0022] In one embodiment of the present application, the connecting plate body is a steel plate.

[0023] In the above technical scheme, the steel plate has high strength and rigidity and good mechanical properties. The connecting plate body is not easily corroded under the action of the first protective layer, the second protective layer and the third protective layer. It also has good conductivity and can ensure the connection and conductivity of the connecting plate to the moving contact and the busbar.

[0024] In a second aspect, an embodiment of the present application provides a moving contact assembly, which includes a moving contact body, and the moving contact connecting plate described in any one of the first aspects.

[0025] In a third aspect, an embodiment of the present application provides a circuit breaker, which includes the moving contact assembly described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A cross-sectional view of a moving contact connecting plate provided in an embodiment of the present application.

[0028] Icon: 1-connecting plate body; 2-first protective layer; 3-second protective layer; 4-third protective layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] If the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] The embodiment of the present application provides a technical solution for solving the problem in the prior art that in order to ensure the conductivity and corrosion resistance of the connecting plate, expensive raw materials have to be used, resulting in high production costs.

[0034] like Figure 1 As shown, an embodiment of the present application provides a moving contact connecting plate, which includes a connecting plate body 1, a first protective layer 2, a second protective layer 3 and a third protective layer 4.

[0035] The first protective layer 2 covers the surface of the connecting plate body 1 , the second protective layer 3 covers the first protective layer 2 , and the third protective layer 4 covers the second protective layer 3 .

[0036] Thus, three protective layers stacked in sequence are formed on the surface of the connecting plate body 1 , which improves the corrosion resistance of the connecting plate body 1 , wherein the corrosion potential of the first protective layer 2 and the third protective layer 4 is higher than that of the second protective layer 3 .

[0037] By setting the third protective layer 4 in the outermost layer, it plays a role in resisting and delaying the occurrence of corrosion. When the outermost third protective layer 4 is corroded, since the corrosion potentials of the first protective layer 2 and the third protective layer 4 are higher than those of the second protective layer 3, the corrosion direction will change from longitudinal corrosion to transverse corrosion, so that the corrosion behavior is mainly concentrated in the second protective layer 3, so that the first protective layer 2 and the connecting plate body 1 are not easily corroded, which plays a role in improving the corrosion resistance of the connecting plate. It should be noted that the "longitudinal" mentioned in this application refers to the direction from the outside to the inside of the connecting plate, that is, the stacking direction of the third protective layer 4, the second protective layer 3, and the first protective layer 2; the "transverse" mentioned in this application refers to the direction parallel to the surface of the connecting plate, such as the extension direction of the second protective layer 3.

[0038] In addition, since the outermost third protective layer 4 is corroded and then the second protective layer 3 is corroded laterally, the process of laterally corroding the second protective layer 3 is relatively long. During the lateral corrosion stage, the connecting plate body 1 and the first protective layer 2 can still maintain a certain mechanical connection ability and conductivity, ensuring the normal operation of the circuit breaker and providing sufficient time for maintenance and replacement.

[0039] Therefore, in the technical solution provided in the embodiment of the present application, under the action of the first protective layer 2, the second protective layer 3 and the third protective layer 4, the connecting plate has good conductivity and corrosion resistance, and the connecting plate body 1 can be made of relatively low-cost materials.

[0040] For example, the connecting plate body 1 is made of steel plate, which has high strength and rigidity and good mechanical properties. The connecting plate body 1 is not easily corroded under the action of the first protective layer 2, the second protective layer 3 and the third protective layer 4, and also has good electrical conductivity, which can ensure the connection and conductivity of the connecting plate to the moving contact and the busbar.

[0041] In some embodiments, the corrosion potential of the third protective layer 4 is higher than or equal to the first protective layer 2. The first protective layer 2 is located in the inner layer and is relatively not easily corroded. As long as the corrosion potential of the first protective layer 2 is higher than the corrosion potential of the second protective layer 3, the purpose of mainly lateral corrosion in the second protective layer 3 can be achieved. Therefore, the corrosion potential of the third protective layer 4 is the highest, which plays a better role in resisting corrosion; the corrosion potential of the first protective layer 2 is higher than that of the second protective layer 3, which achieves the purpose of lateral corrosion. At the same time, the corrosion potential of the first protective layer 2 can be selected from a material lower than that of the third protective layer 4 to further reduce the manufacturing cost.

[0042] The first protective layer 2 and the third protective layer 4 respectively include metal layers, and the second protective layer 3 includes a metal-graphene composite layer. By setting the second protective layer 3 as a metal-graphene composite layer, the graphene in the second protective layer 3 is combined with the metal to improve the conductivity and fill the gap, so that the second protective layer 3 has a stronger corrosion resistance than the protective layer made of the metal alone, thereby further improving the corrosion resistance and conductivity.

[0043] Optionally, the first protective layer 2 includes a copper layer, the third protective layer 4 includes a silver layer, and the second protective layer 3 includes a nickel-graphene composite layer. Both the copper layer and the silver layer can enhance the corrosion resistance of the connecting plate body 1; the silver layer, as the outermost third protective layer, has a good anti-oxidation effect and can further delay the corrosion process; the nickel-graphene layer, as an intermediate layer, can isolate the copper layer and the silver layer, avoiding the problem of silver-copper replacement caused by direct silver plating on the copper layer. At the same time, nickel also plays a role in connecting the copper layer and the silver layer, improving the bonding force, and avoiding the problem of peeling due to weak bonding force. In addition, copper, silver and graphene all have excellent electrical conductivity. Graphene connects copper and silver, so that the conductivity of the connecting plate is enhanced. In addition, the role of graphene in filling the gap can further reduce resistance, improve conductivity, and reduce the problem of safety hazards caused by heat, so that the safety of the circuit breaker is improved.

[0044] Optionally, the graphene content of the second protective layer 3 is 10%-30%, so that the second protective layer 3 has good electrical conductivity, corrosion resistance and good structural strength.

[0045] In some embodiments, the thickness of the first protective layer 2 and the second protective layer 3 is greater than that of the third protective layer 4. The thickness of the third protective layer 4, which is relatively more corrosion-resistant, does not need to be set too thick, as long as it can resist and delay corrosion, further reducing production costs. By making the second protective layer 3 thicker, the process of lateral corrosion of the second protective layer 3 is longer, and the second protective layer 3 is not easily corroded. By making the first protective layer 2 thicker, the innermost connecting plate body 1 has a better anti-corrosion effect.

[0046] Optionally, the first protective layer 2 has a thickness of 2-4 μm. For example, a copper layer with a thickness of 2-4 μm is coated on the surface of the connecting plate body 1 .

[0047] Optionally, the second protective layer 3 has a thickness of 2-5 μm. For example, a nickel-graphene composite layer with a thickness of 2-5 μm is coated on the surface of the copper layer.

[0048] Optionally, the thickness of the third protective layer 4 is 0.3-0.6 μm. For example, a silver layer with a thickness of 0.3-0.6 μm is coated on the surface of the nickel-graphene composite layer.

[0049] In the embodiment of the present application, the first protective layer 2 and the third protective layer 4 can be formed by spraying, vapor deposition, electroplating, etc.; the second protective layer 3 can be formed by chemical vapor deposition, electrodeposition, hot pressing sintering, etc.

[0050] Illustratively, in some embodiments, a steel plate is selected to make the connecting plate body 1, and a copper layer with a thickness of 4 μm is formed on the surface of the connecting plate body 1 by electroplating as the first protective layer 2; then, the nickel powder and the graphene powder are fully mixed and hot-pressed and sintered to form a nickel-graphene composite layer covering and connecting the first protective layer 2, and the nickel-graphene composite layer serves as the second protective layer 3; finally, a silver layer with a thickness of 0.5 μm is electroplated on the surface of the second protective layer 3.

[0051] Under the same test conditions, salt spray tests were performed on the connecting plates provided in the embodiments of the present application and connecting plates made of other metal materials. The salt spray test time of the connecting plates provided in the embodiments of the present application was greater than 96 hours, while the connecting plates made of other metal materials were not as good as the embodiments of the present application. For example, the salt spray test time of iron was 48 hours, the salt spray test time of ordinary carbon steel was 50 hours, and the salt spray test time of pure copper and brass was 48 hours.

[0052] In a second aspect, the present application also provides a moving contact assembly, which includes a moving contact body and a moving contact connecting plate provided in the above embodiment. The moving contact assembly provided in the present application has better mechanical properties and longer service life, is not prone to failure, and has higher safety.

[0053] In a third aspect, the present application also provides a circuit breaker, the circuit breaker comprising the moving contact assembly provided in the above embodiment. The moving contact assembly of the circuit breaker provided in the present application has better mechanical properties and longer service life, and the circuit breaker has higher safety.

[0054] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A moving contact connecting plate, characterized in that: include: A connecting plate body (1); A first protective layer (2) covers the surface of the connecting plate body (1); A second protective layer (3), covering the first protective layer (2); a third protective layer (4), covering the second protective layer (3); Wherein, the first protective layer (2) comprises a copper layer, the third protective layer (4) comprises a silver layer, and the second protective layer (3) comprises a nickel-graphene composite layer.

2. The moving contact connecting plate according to claim 1, characterized in that: The thickness of the first protective layer (2) is greater than that of the third protective layer (4).

3. The moving contact connecting plate according to claim 1, characterized in that: The thickness of the second protective layer (3) is greater than that of the third protective layer (4).

4. The moving contact connection plate according to any one of claims 1 to 3, characterized in that: The thickness of the first protective layer (2) is 2-4 μm.

5. The moving contact connection plate according to any one of claims 1 to 3, characterized in that: The thickness of the second protective layer (3) is 2-5 μm.

6. The moving contact connection plate according to any one of claims 1 to 3, characterized in that: The thickness of the third protective layer (4) is 0.3-0.6 μm.

7. The moving contact connecting plate according to claim 1, characterized in that: The connecting plate body (1) is a steel plate.

8. A moving contact assembly, characterized in that: It comprises a moving contact body and a moving contact connecting plate as described in any one of claims 1 to 7.

9. A circuit breaker, characterized in that: Includes the moving contact assembly as claimed in claim 8.

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