Direct-current relay resistant to short-circuit current

Patent metadata

Field	Value
Publication number	US-11670472-B2
Application number	US-201917292418-A
Country	US
Kind code	B2
Filing date	Nov 8, 2019
Priority date	Nov 9, 2018
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A DC relay resistant to short-circuit current includes two stationary contact leading-out terminals, a push rod component and a straight sheet type movable spring mounted on the push rod component. Upper magnetizers arranged in a width direction of the movable spring are mounted above a preset position of the movable spring. Lower magnetizers arranged mounted below the preset position can move with the movable spring. At least one through hole is provided in the movable spring at the preset position, so that the upper magnetizers and the lower magnetizers can approach one to another or come into contact with each other through the through holes; and at least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper magnetizers and the lower magnetizers.

First claim

What is claimed is:

1. A DC relay resistant to short-circuit current, comprising two stationary contact leading-out terminals, a straight sheet type movable spring and a push rod component, in which the movable spring is mounted on the push rod component so that movable contacts on two ends of the movable spring are in contact with stationary contacts on bottom ends of the two stationary contact leading-out terminals under an action of the push rod component, and a current flows in from one of the two stationary contact leading-out terminals and flows out of the other of the two stationary contact leading-out terminals via through the movable spring, wherein the movable contacts are respectively arranged outside of opposite sides of the upper magnets,
wherein upper magnetizers arranged in a width direction of the movable spring are mounted above a preset position of the movable spring; lower magnetizers arranged in the width direction of the movable spring and of moving with the movable spring are mounted below the preset position of the movable spring; at least one through hole is provided in the movable spring at the preset position, so that the upper magnetizers and the lower magnetizers can approach one to another or come into contact with each other through the through hole; and at least two independent magnetically conductive loops are formed in the width direction of the movable spring by means of the upper magnetizers and the lower magnetizers; magnetic pole faces of the respective magnetically conductive loops at the through hole are increased such that when the movable spring has a large fault current, attraction force in a contact pressure direction is generated to resist an electro-dynamic repulsion force generated, due to the fault current between the movable spring and the stationary contact leading-out terminals.

2. The DC relay resistant to short-circuit current according to claim 1 , wherein the preset position is between two movable contacts in a width direction of the movable spring.

3. The DC relay resistant to short-circuit current according to claim 1 , wherein the upper magnetizers comprise at least one rectangular upper magnetizer, and the lower magnetizers comprise at least two U-shaped lower magnetizers, wherein one of the at least two U-shaped lower magnetizer and a corresponding one of the at least one rectangular upper magnetizers form an independent magnetically conductive loop, and the two U-shaped lower magnetizers are not in contact with each other.

4. The DC relay resistant to short-circuit current according to claim 3 , wherein adjacent two U-shaped lower magnetizers share one of the rectangular upper magnetizers, the two U-shaped lower magnetizers are fitted below the corresponding one of the at least one rectangular upper magnetizers.

5. The DC relay resistant to short-circuit current according to claim 3 , wherein rectangular adjacent two U-shaped lower magnetizers are independent from each other, the two U-shaped lower magnetizers are fitted below the corresponding rectangular upper magnetizers.

6. The DC relay resistant to short-circuit current according to claim 3 , wherein there are two magnetically conductive loops, the movable spring is provided with one through hole, and each of the two U-shaped lower magnetizers has one side wall attached to a side in the width direction of the movable spring, and the other side wall passing through the through hole of the movable spring, and a gap is presented between the other side walls of the two U-shaped lower magnetizers.

7. The DC relay resistant to short-circuit current according to claim 6 , wherein the other side walls of the two U-shaped lower magnetizers are arranged side by side in a width direction of the movable spring within the through hole of the movable spring, such that the two magnetically conductive loops corresponding to the two U-shaped lower magnetizers are arranged side by side in the width direction of the movable spring.

8. The DC relay resistant to short-circuit current according to claim 6 , wherein the other side walls of the two U-shaped lower magnetizers are arranged in a staggered manner in a width direction of the movable spring within the through hole of the movable spring, such that the two magnetically conductive loops corresponding to the two U-shaped lower magnetizers are distributed in the staggered manner in the width direction of the movable spring.

9. The DC relay resistant to short-circuit current according to claim 6 , wherein the push rod component comprises a U-shaped bracket, a spring seat and a push rod; a top portion of the push rod is secured to the spring seat; a bottom portion of the U-shaped bracket is secured to the spring seat; and a movable spring assembly composed of the movable spring and the two U-shaped lower magnetizers is mounted within the U-shaped bracket by the spring, wherein an upper surface of the movable spring abuts against the upper yoke, the upper yoke is fixed on an inner wall of the top portion of the U-shaped bracket, the spring elastically abuts between bottom ends of the two U-shaped lower magnetizers and a top end of the spring seat.

10. The DC relay resistant to short-circuit current according to claim 9 , wherein two semi-circular grooves for positioning the spring are respectively provided on the bottom ends of the two U-shaped lower magnetizers, and the two semi-circular grooves surround a complete circle so as to fit on the top portion of the spring.

11. The DC relay resistant to short-circuit current according to claim 9 , wherein positioning posts for positioning the spring are respectively provided on the bottom ends of the two U-shaped lower magnetizers, so as to position the spring outside the top portion of the spring by the positioning posts.

12. The DC relay resistant to short-circuit current according to claim 3 , wherein there are two magnetically conductive loops, the movable spring is provided with two through holes that are arranged side by side in a width direction of the movable spring, and each of the two U-shaped lower magnetizers has one side wall attached to a side in the width direction of the movable spring, and the other side wall fitted in one of the two through holes of the movable spring, such that the two magnetically conductive loops corresponding to the two U-shaped lower magnetizers are arranged side by side in the width direction of the movable spring.

13. The DC relay resistant to short-circuit current according to claim 3 , wherein there are two magnetically conductive loops, the movable spring is provided with two through holes that are arranged in a staggered manner in a width direction of the movable spring, each of the two U-shaped lower magnetizers has one side wall attached to a corresponding side in the width direction of the movable spring, and the other side wall fitted to one of the two through holes of the movable spring, such that the two magnetically conductive loops corresponding to the two U-shaped lower magnetizers are arranged in a staggered manner in the width direction of the movable spring.

14. The DC relay resistant to short-circuit current according to claim 3 , wherein there are three magnetically conductive loops, the movable spring is provided with two through holes, and three U-shaped lower magnetizers are sequentially arranged in the width direction of the movable spring, wherein the two side walls of the U-shaped lower magnetizer in the middle pass through the two through holes of the movable spring respectively, and each of the two U-shaped lower magnetizers on two sides have one side wall attached to a corresponding side of the movable sprin

Assignees

• Xiamen Hongfa Electric Power Controls Co Ltd

Inventors

• Zhong Shuming
• Dai Wenguang
• Fu Dapeng
• Wang Meng

Classifications

• H01H1/54

  by magnetic force {(combined with electrodynamic opening H01H77/101)} · CPC title

• H01H50/18

  Movable parts of magnetic circuits, e.g. armature · CPC title

• H01H50/56

  Contact spring sets · CPC title

• H01H53/02

  Electrodynamic relays, i.e. relays in which the interaction is between two current-carrying conductors · CPC title

• H01H50/16

  Magnetic circuit arrangements · CPC title