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DC relay capable of arc extinguishing and resisting short-circuit current

A DC relay, anti-short-circuit technology, applied in electromagnetic relays, electromagnetic relay details, relays, etc., can solve the problems that the contact pressure is not enough to resist the electric repulsion of the moving spring, the volume is small, and the suction force cannot be provided, and the magnetic efficiency is achieved. High, the magnetic circuit is not easy to saturate the effect

Pending Publication Date: 2019-04-19
XIAMEN HONGFA ELECTRIC POWER CONTROLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The DC relays in the prior art are usually equipped with magnets near the contacts, and use the magnetic field generated by the magnets to realize arc extinguishing. When a fault short-circuit current occurs in this DC relay, it will be between the dynamic and static contacts. Generate electric repulsion, thus affecting the stability of contact between dynamic and static contacts
With the rapid development of the new energy industry, the requirements for the anti-short-circuit function of the DC relay are getting higher and higher. However, the DC relay of the prior art cannot provide enough suction while maintaining the characteristics of small size, that is, the contact pressure is not enough to resist Electric repulsion to the moving spring, so it is difficult to meet market requirements

Method used

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  • DC relay capable of arc extinguishing and resisting short-circuit current
  • DC relay capable of arc extinguishing and resisting short-circuit current
  • DC relay capable of arc extinguishing and resisting short-circuit current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] see Figure 1 to Figure 14 As shown, a DC relay capable of extinguishing arcs and resisting short-circuit current of the present invention includes two static contact terminals 11, 12 for current inflow and current outflow respectively, and a straight-type movable reed 2 1. One is used to drive the moving reed 2 to move to realize the moving contact at both ends of the moving reed and the static contact at the bottom of the static contact lead-out end to contact or disconnect the push rod part 3 and two pieces of magnetic steel 71; two static The contact lead-out ends 11 and 12 are mounted on the casing 4 respectively, and a part of the moving reed 2 and the push rod part 3 are accommodated in the casing 4, and the push rod part 3 is also connected with the moving iron core 5 in the magnetic circuit structure , under the action of the magnetic circuit, the push rod part 3 drives the movable reed 2 to move upwards, so that the movable contacts at both ends of the movable...

Embodiment 2

[0064] see Figure 15 As shown, a DC relay capable of extinguishing arcs and resisting short-circuit current of the present invention differs from Embodiment 1 in that the magnetic poles of the two magnetic steels 71 facing the moving and static contacts are set oppositely, specifically , among the two pieces of magnetic steel 71, the magnetic pole of a piece of magnetic steel 71 corresponding to the side of the static contact lead-out end 11 facing the corresponding moving and static contact is set as N pole, corresponding to the side of the static contact lead-out end 12 The magnetic pole of one side of a piece of magnetic steel 71 facing the corresponding moving and static contact is also set as S pole. In this embodiment, the magnetic field formed by the cooperation of the two magnetic steels 71 and the two yoke clips 72 can be formed as follows Figure 15 The magnetic blowing force in the direction indicated by the middle arrow, the magnetic blowing force in two directio...

Embodiment 3

[0067] see Figure 16 to Figure 17 As shown, a DC relay capable of extinguishing arcs and resisting short-circuit current in the present invention differs from Embodiment 1 in that the upper magnetic conductor 61 is an upper yoke, and the upper yoke is fixed on two On the shell of a static contact lead-out end, like this, when the moving contact of moving reed 2 and the static contact of static contact lead-out 11,12 are not in contact with (that is, when the contacts are disconnected), the upper lead There is a preset gap between the magnet 61 (upper yoke) and the lower magnetic conductor 62 (lower armature), and the movable contact of the movable reed 2 is in contact with the static contacts of the static contact terminals 11 and 12. When mating, the upper magnetizer 61 and the lower magnetizer 62 are in contact, that is, there is basically no gap between the upper magnetizer 61 and the lower magnetizer 62 .

[0068] Embodiment three

[0069] see Figure 18 to Figure 20 A...

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Abstract

The invention discloses a DC relay capable of arc extinguishing and resisting short-circuit current. The DC relay comprises two static contact leading-out ends, a straight sheet type movable contact spring, a push rod component and two pieces of magnetic steel. The two pieces of magnetic steel are arranged at the positions, corresponding to the moving contacts and the static contacts, of the two sides of the width of the movable reed respectively, the moving contacts and the static contacts corresponding to the two pieces of magnetic steel are different to achieve magnetic quenching, an uppermagnetizer is installed above the movable reed, and a lower magnetizer is installed below the movable reed. At least one through hole is formed in the movable reed, so that the upper magnetizer and the lower magnetizer can get close to each other or make contact with each other through the through holes, and at least two independent magnetic conducting loops are formed by the upper magnetizer andthe lower magnetizer in the width direction of the movable reed. According to the invention, by utilizing the magnetic pole surfaces added at the positions corresponding to the through holes of the magnetic circuits, when the movable contact spring has faults and large current, suction force in the pressure direction of the contacts is generated, so that electric repulsion force generated betweenthe movable contact spring and the leading-out end of the static contact due to the fault current is resisted.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to a DC relay capable of extinguishing arcs and resisting short-circuit current. Background technique [0002] A DC relay in the prior art adopts a direct-acting magnetic circuit structure, and two static contact terminals (that is, two load terminal terminals) are respectively installed on the housing, and the bottom ends of the two static contact terminal terminals are arranged There are static contacts, the current of one of the static contact terminals flows in, and the current of the other static contact terminal flows out. A moving spring and a push rod part are installed in the housing. The moving spring adopts a straight-type moving reed (also known as Bridge-type moving reed), the moving reed is installed in the push rod part through the spring, the push rod part is connected with the direct-acting magnetic circuit, under the action of the direct-acting magnetic circuit, the...

Claims

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Application Information

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IPC IPC(8): H01H50/38H01H50/64
CPCH01H50/38H01H50/641
Inventor 钟叔明代文广傅大鹏王萌
Owner XIAMEN HONGFA ELECTRIC POWER CONTROLS
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