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Circuit breaker electrical contact support member and preparation method thereof

A technology for supporting parts and circuit breakers, applied in circuit breaker parts, circuit breaker contacts, electrical components, etc., can solve the problems of difficult control of surface contact resistivity, Fe metal is easily oxidized, and bonding strength cannot be obtained. Reduce the degree of ablation, achieve convenience, and improve competitiveness

Inactive Publication Date: 2015-12-16
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the Cu / Fe / Cu material is used as a contact strip, which can reduce the cost, but if the material is directly used to prepare the electrical contact material, the contact interface of the contact is Cu or Cu / Fe / Cu when it is closed. , the conductivity of these two materials is lower than that of Ag, and Cu has poor mechanical strength at high temperature and is prone to deformation, resulting in unstable contact, while Fe metal is easy to be oxidized, and the structure and properties of Fe metal are different. It is anisotropic, and its surface contact resistivity is difficult to control. Therefore, Cu / Fe / Cu is not suitable as an electrical contact material directly; if Cu / Fe / Cu material is used as a contact support alone, when it contacts with silver-based contact material When the surface is Cu, the Cu layer of Cu / Fe / Cu will loosen or even break away from the Cu / Fe / Cu composite block during the continuous opening and closing process of the contact. In addition, when the contact surface with the silver-based contact material is Cu / In the case of Fe / Cu, Fe and Ag cannot obtain sufficient bonding strength through welding, cold compounding, etc., so failures such as Ag-based contact drop may occur during use

Method used

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  • Circuit breaker electrical contact support member and preparation method thereof
  • Circuit breaker electrical contact support member and preparation method thereof
  • Circuit breaker electrical contact support member and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] to prepare as figure 2 The shape shown in the support is taken as an example, wherein the groove is a dovetail groove, and the contact is made of AgW50; the insert 2 is made of pure Cu, and its shape is dovetail. A method for preparing a support for an electrical contact of a circuit breaker, comprising the following steps:

[0051] The first step: clean the pure Fe material tape and the pure Cu material tape with organic solvent and acid solution respectively, clean the pure Cu material tape and the pure Fe material tape, and clean the pure Cu tape and the pure Fe tape Solid-phase rolling composite at room temperature to prepare Cu / Fe / Cu structured strips, wherein: after rolling, the width of the strip is 150mm, the thickness is 20mm, and the thickness of the Cu layer on each side accounts for 20% of the thickness of the entire strip. The two Cu layers of the Cu / Fe / Cu strip are located on both sides and the Fe layer is in the middle.

[0052] The second step: heat-t...

Embodiment 2

[0061] to prepare as image 3 The shape support shown is an example, wherein the groove is an L-shaped groove, and the contact is made of AgWC material; the insert 2 is made of AgNi, and the shape is an L-shaped insert; the preparation method of the circuit breaker electrical contact support includes the following step:

[0062] The first step: Surface treatment of Cu strips and Fe strips, impregnation of Cu strips as soluble anodes, impregnation of Fe strips as cathodes, and electroplating of these anodes and cathodes to prepare Cu / Fe / Cu The material strip of the structure, wherein: the Fe material width is 80mm, the thickness is 3mm, the Cu layer thickness percentage of each side after electroplating is respectively 5%, and the electroplating bath is a pyrophosphate copper plating bath.

[0063] Step 2: Carry out heat treatment to Cu / Fe / Cu strip, wherein: the temperature of heat treatment is 300 degrees, the time is 2 hours, the atmosphere is N 2 .

[0064] Step 3: rollin...

Embodiment 3

[0072] to prepare as Figure 4 Taking the shape support as an example, the groove is a trapezoidal groove, and the contact is made of AgWC22C3; the insert 2 is made of CuNi, and its shape is trapezoidal. A method for preparing a support for an electrical contact of a circuit breaker, comprising the following steps:

[0073] The first step: bend the Cu strip into a U shape, wherein the width of the bent strip is the same as that of the Fe strip, and the height of the U-shaped gap is equal to or slightly smaller than the thickness of the Fe strip, and the Fe strip is inserted into the In the U-shaped Cu material strip, carry out cold rolling and compounding at room temperature to prepare a material strip with a Cu / Fe / Cu structure. After rolling, the material bandwidth is 50mm, the thickness of the material strip is 10mm, and the thickness percentage of each Cu layer is 10. %. like figure 1 shown.

[0074] The second step: heat-treat the Cu / Fe / Cu strip, wherein: the temperatu...

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Abstract

The invention discloses a circuit breaker electrical contact support member and a preparation method thereof. The support member comprises a support member body made of a Cu / Fe / Cu material strip. One side of the support member body is provided with a built-in groove; the groove is embedded by a conductive insert block; and the insert block is provided with a contact point. The method is characterized by, carrying out thermal treatment on the Cu / Fe / Cu material strip, and rolling the Cu / Fe / Cu material strip obtained after thermal treatment; carrying out punching on the Cu / Fe / Cu material strip obtained after rolling to prepare the support member body; preparing the insert block, and inserting and welding the insert block to one side of the obtained support member body; and welding the contact point to the other side of the insert block. The support member is prepared by inserting the Cu block or other conductive metal blocks into the Cu / Fe / Cu composite strip, thereby improving the strength of the contact support member, ensuring stability of the current conduction when an electrical contact is contacted, and meanwhile, reducing copper material consumption and saving cost.

Description

technical field [0001] The invention relates to the technical field of electrical devices, in particular to a circuit breaker electrical contact support and a preparation method thereof. Background technique [0002] A circuit breaker is a switching device used in power distribution networks to distribute electric energy and protect lines and power supply equipment. It consists of two parts: an operating mechanism and an electrical contact system. The electrical contact system is divided into a moving contact system and a static contact system, which include contacts and supports respectively. The support serves as a mechanism for transmitting current and driving the contacts, and its performance directly affects the reliability of the circuit breaker. and stability. [0003] After searching, there are very few researches or reports on contact supports for circuit breakers at home and abroad. At present, the raw material of the contact support in the circuit breaker is usu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H73/04H01H69/00
CPCH01H73/04H01H69/00
Inventor 费玲娟穆成法张舟磊
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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