US-12626875-B2 - Relay

Abstract

A relay includes an insulating cover having a contact chamber and a pair of first through holes in communication with the contact chamber; a pair of static contact leading-out terminals passing through the pair of first through holes; a fixing member including a fixing part and a connector with a tubular structure, the connector is fixedly connected between the insulating cover and the fixing part; a moving part within the contact chamber and movably connected to the fixing member; a first magnetizer within the contact chamber and connected with the moving part; and a movable member within the contact chamber and including a movable contact piece. The first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.

Inventors

• Shuming ZHONG
• Meng Wang
• Wenguang Dai
• Songsheng CHEN

Assignees

• XIAMEN HONGFA ELECTRIC POWER CONTROLS CO., LTD.

Dates

Publication Date

20260512

Application Date

20240410

Priority Date

20230411

Claims (20)

1. 1 . A relay, comprising: an insulating cover having a contact chamber and a pair of first through holes in communication with the contact chamber; a pair of static contact leading-out terminals passing through the pair of first through holes, respectively; a fixing member comprising a fixing part and a connector, the connector has a tubular structure, one end of the connector in an axial direction is fixedly connected with the insulating cover, and the other end of the connector in the axial direction is connected with the fixing part; a moving part arranged within the contact chamber and movably connected to the fixing part; a first magnetizer arranged within the contact chamber and connected with the moving part; and a movable member movably arranged within the contact chamber and comprising a movable contact piece, the movable contact piece configured to come into contacted with or separated from the pair of static contact leading-out terminals; the first magnetizer being arranged at one side of the movable contact piece facing the static contact leading-out terminals; wherein the first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.
2. 2 . The relay according to claim 1 , wherein the distance between the first magnetizer and the movable member is a maximum distance between the first magnetizer and the movable member.
3. 3 . The relay according to claim 1 , wherein the first magnetizer moves between a first position and a second position through the moving part; at the first position, the distance between the first magnetizer and the movable member is a first distance, and at the second position, the distance between the first magnetizer and the movable member is a second distance, and the first distance is greater than the second distance.
4. 4 . The relay according to claim 3 , wherein at the second position, the second distance between the first magnetizer and the movable member is equal to zero.
5. 5 . The relay according to claim 3 , wherein the first magnetizer is located at the first position, and the value of the current flowing through the movable contact piece is less than or equal to a threshold current; when the value of the current flowing through the movable contact piece is greater than the threshold current, the first magnetizer moves from the first position to the second position.
6. 6 . The relay according to claim 1 , wherein the relay further comprises: a first elastic part for providing an elastic force to the moving part, so that the first magnetizer has a trend to move away from the movable member.
7. 7 . The relay according to claim 6 , wherein the fixing part has a first side facing the movable member and a second side opposite to the first side; the first elastic part is arranged at the second side, the first magnetizer and the movable member are both arranged at the first side, and the first magnetizer is arranged between the first elastic part and the movable member; the moving part has one end connected with the first elastic part, and the other end connected with the first magnetizer.
8. 8 . The relay according to claim 7 , wherein the fixing part has a first perforation which penetrates a surface of the first side and a surface of the second side; the moving part is rod-shaped and movably passes through the first perforation.
9. 9 . The relay according to claim 8 , wherein the first elastic part has a second perforation aligning with the first perforation; the moving part passes through the first perforation and the second perforation.
10. 10 . The relay according to claim 9 , wherein the moving part comprises a rod body and a pressing cap arranged at an end of the rod body, and the pressing cap presses against a periphery of the second perforation facing away from a side of the first magnetizer.
11. 11 . The relay according to claim 10 , wherein the first magnetizer is provided with a third perforation aligning with the first perforation and the second perforation, and the rod body passes through the second perforation, the first perforation and the third perforation in sequence; a step structure is arranged at an outer periphery of the rod body, an end of the rod body facing the movable member is fixedly connected with the first magnetizer, and the step structure presses against a periphery of the third perforation facing a side of the first elastic part.
12. 12 . The relay according to claim 7 , wherein the first magnetizer moves between a first position and a second position through the moving part; at the first position, a distance between the first magnetizer and the movable member is a first distance, and at the second position, a distance between the first magnetizer and the movable member is a second distance, and the first distance is greater than the second distance; at the first position, the first magnetizer presses against the surface of the first side, and an end of the moving part presses against the first elastic part, so that the first elastic part has elastic pre-pressure.
13. 13 . The relay according to claim 6 , wherein the first magnetizer, the fixing part and the first elastic part are arranged between the pair of the static contact leading-out terminals.
14. 14 . The relay according to claim 6 , wherein the first elastic part comprises a reed or a spring.
15. 15 . The relay according to claim 1 , wherein a moving direction of the first magnetizer relative to the movable member is a direction in which the movable contact piece is in contact with or separated from the static contact leading-out terminals.
16. 16 . The relay according to claim 1 , wherein the moving part is movably arranged at a side of the movable member facing the static contact leading-out terminals, and the moving part is located between the pair of the static contact leading-out terminals.
17. 17 . The relay according to claim 1 , wherein the moving part is made of a metal material.
18. 18 . The relay according to claim 1 , wherein the insulating cover comprises a ceramic cover, the pair of first through holes are formed on the ceramic cover; one end of the connector in the axial direction is fixedly connected with the ceramic cover.
19. 19 . The relay according to claim 18 , wherein the ceramic cover is provided with a third through hole, the connector passes through the third through hole, one end of the connector in the axial direction is connected to a periphery of the third through hole of the ceramic cover.
20. 20 . The relay according to claim 19 , wherein the connector comprises: an inserting part, the inserting part has a tubular structure, the inserting part is inserted into the third through hole, and one end of the inserting part is connected to the fixing part; a flange protruding from one peripheral surface of the inserting part far away from the fixing part, the flange is connected with a periphery of the third through hole of the ceramic cover.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is based upon and claims priority to Chinese Patent Application No. 202310383300.1, filed on Apr. 11, 2023, the entire content thereof is incorporated herein by reference. TECHNICAL FIELD An embodiment of the present disclosure relates to the technical field of electronic control devices, in particular to a relay. BACKGROUND A relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and usually used in an automatic control unit. The relay is actually an automatic switch that may control a larger current with a smaller current, so that it plays a role of automatic adjustment, safety protection and switching circuits in the circuit. A high-voltage DC relay is a kind of relay. In order to solve the issue of contact bounce caused by the electro-dynamic repulsion force of contacts in the high-voltage DC relay due to short circuit current, it is common to employ an anti-short circuit ring electromagnetic structure. Based on a position of the upper magnetizer of the anti-short circuit ring, it could be further classified into a follow-up structure and a stationary structure. Specifically, the follow-up structure refers to that the upper magnetizer is placed on a movable member of the relay, while the stationary structure refers to that the upper magnetizer is arranged in a fixed location other than the movable member. However, although the stationary anti-short circuit structure significantly enhances its ability to withstand the short circuit, it results in that breaking ability is weaken due to the negative correlation between the short circuit ability and the breaking ability. The movable anti-short circuit structure is affected by a holding force of a movable core, and when the short circuit current is high, the magnetic core may be detached, resulting in contact broken. To increase the holding force of the movable core, it requires increasing size of the coil, which is conflict with a compact and lightweight design. SUMMARY A relay according to the embodiment of the present disclosure includes: an insulating cover having a contact chamber and a pair of first through holes in communication with the contact chamber;a pair of static contact leading-out terminals passing through the pair of first through holes, respectively;a fixing member comprising a fixing part and a connector, the connector has a tubular structure, one end of the connector in an axial direction is fixedly connected with the insulating cover, and the other end of the connector in the axial direction is connected with the fixing part;a moving part arranged within the contact chamber and movably connected to the fixing member;a first magnetizer arranged within the contact chamber and connected with the moving part; anda movable member movably arranged within the contact chamber and comprising a movable contact piece, the movable contact piece configured to come into contacted with or separated from the pair of static contact leading-out terminals; the first magnetizer being arranged at one side of the movable contact piece facing the static contact leading-out terminals;wherein the first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece. According to some embodiments of the present disclosure, the distance between the first magnetizer and the movable member is a maximum distance between the first magnetizer and the movable member. According to some embodiments of the present disclosure, the first magnetizer moves between a first position and a second position through the moving part; at the first position, the distance between the first magnetizer and the movable member is a first distance, and at the second position, the distance between the first magnetizer and the movable member is a second distance, and the first distance is greater than the second distance. According to some embodiments of the present disclosure, at the second position, the second distance between the first magnetizer and the movable member is equal to zero. According to some embodiments of the present disclosure, the first magnetizer is located at the first position, and the value of the current flowing through the movable contact piece is less than or equal to a threshold current; when the value of the current flowing through the movable contact piece is greater than the threshold current, the first magnetizer moves from the first position to the second position. According to some embodiments of the present disclosure, the relay further comprises: a first elastic part for providing an elastic force to the moving part, so that the first magnetizer has a trend to move away from the movable member. According to some embodiments of th