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Direct-current high-voltage relay and contact material for direct-current high-voltage relay

A DC high voltage, contact material technology, applied in the direction of relays, electromagnetic relays, electromagnetic relay details, etc., to achieve the effect of excellent heat resistance, good arc discharge characteristics, and reliable on/off control

Pending Publication Date: 2022-04-15
TANAKA PRECIOUS METAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because when the metal component other than Ag in the contact material is set to less than 10% by mass, the amount of oxides is small, so the required characteristics may not be satisfied due to defects such as welding, transfer, and consumption.

Method used

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  • Direct-current high-voltage relay and contact material for direct-current high-voltage relay
  • Direct-current high-voltage relay and contact material for direct-current high-voltage relay
  • Direct-current high-voltage relay and contact material for direct-current high-voltage relay

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Experimental program
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Effect test

no. 1 Embodiment approach

[0105] first embodiment : In this embodiment, various Ag-oxide contact materials are manufactured by internal oxidation method and powder metallurgy method, and the material characteristics are studied, and a DC high voltage relay (contact force / separation force: 75gf / 125gf) is manufactured, Operation confirmation (opening durability) was performed, and arc discharge characteristics and contact resistance were measured.

[0106] In the manufacture of a contact material by the internal oxidation method, first, an ingot of an Ag alloy of each composition is cast by melting and casting in a high-frequency melting furnace. After melting and casting, the ingot is made into a solid piece of less than 3mm, which is subjected to internal oxidation treatment. The internal oxidation treatment is to adjust the oxygen partial pressure and heating temperature within the range of oxygen partial pressure 0.2-0.9MPa and heating temperature 500°C-900°C. Next, collect the solid pieces after ...

no. 2 Embodiment approach

[0144] 2nd embodiment : In the present embodiment, the same DC high-voltage relay as the first embodiment is manufactured and the magnetic force of the arc-extinguishing magnet is set to be low, and the arc discharge characteristics when the contact materials of each embodiment and comparative example are assembled Make an evaluation.

[0145] In this embodiment, a DC high voltage relay having a double-break structure similar to that of the first embodiment is prepared, and rivet-type contacts made of various contact materials are joined to the movable terminal and the fixed terminal. The size of each contact is the same as that of the first embodiment. In addition, a neodymium magnet having a magnetic flux density of 200 mT is arranged around the movable contact and the fixed contact as an arc-extinguishing magnet, and the usage amount of neodymium which is a rare earth element is reduced compared with the first embodiment. According to the measurement with a gauss meter, ...

no. 3 Embodiment approach

[0154] third embodiment : In the first and second embodiments, a DC high voltage relay ( figure 1 ), and a disconnection endurance test was carried out to simulate the disconnection operation when an abnormality occurred. In the present embodiment, the durability and contact resistance were evaluated when the DC high voltage relay was actually mounted as a system main relay of a hybrid vehicle or the like, and the switching operation during normal use was simulated. The normal use refers to the use condition under which the load is received by the on / off operation of the power supply of a normal circuit.

[0155] The usual conditions of use of the DC high voltage relay assumed by the present invention will be specifically described. In a DC circuit such as a hybrid car, a precharge relay suitable for the inrush current is installed to prevent the contact of the system main relay from being damaged by the high inrush current when the power is turned on. Also, after the hig...

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Abstract

The present invention relates to a DC high-voltage relay having a rated voltage of 48 V or more, wherein the DC high-voltage relay is provided with at least one contact pair comprising a movable contact and a fixed contact, and the contact force and / or separation force of the contact pair is 100 gf or more. A movable contact and / or a fixed contact of a DC high-voltage relay according to the present invention is configured from an Ag-oxide-based contact material. The metal component of the contact material is composed of at least one metal M which must contain Zn and the balance of Ag and unavoidable impurity metals, and the content of the metal M is 0.2-8 mass% relative to the total mass of all the metal components of the contact material. The contact material exhibits a material structure in which one or more oxides of a metal M having an average particle diameter of 0.01 [mu] m or more and 0.4 [mu] m or less are dispersed in a matrix comprising Ag or an Ag alloy.

Description

technical field [0001] The present invention relates to a DC high voltage relay (contactor) for on / off control of a DC high voltage circuit. More specifically, it relates to a DC high voltage relay having excellent arc discharge characteristics for rapidly extinguishing arc discharge generated when contacts are separated, and having low contact resistance and low heat generation characteristics during continuous energization. In addition, the present invention relates to the contact material applied to the DC high voltage relay. Background technique [0002] Power storage devices used in power supply circuits, charging circuits, and power supply systems for photovoltaic power generation equipment of vehicles equipped with high-voltage batteries, such as hybrid vehicles (HV), plug-in hybrid vehicles (PHV), and electric vehicles (EV) In the control of high-voltage circuits such as power regulators, DC high-voltage relays are used. For example, in the above-mentioned hybrid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/027H01H50/54C22C5/06C22C32/00C22C1/05C22C1/10
CPCH01H1/027H01H50/54C22C5/06C22C32/0021C22C1/05C22C1/1036C22C1/1063H01H1/023H01H11/048H01H50/546C22C1/0466B22F1/05B22F2998/10B22F2999/00C22C29/12B22F3/16C22C1/1078H01H1/0237B22F3/02B22F3/10B21C1/00B22F5/12B22F2003/208B22F3/168H01H50/44
Inventor 西出早治大中村哲也柳原宣仁
Owner TANAKA PRECIOUS METAL IND
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