CN-122000241-A - High-voltage direct-current relay

CN122000241ACN 122000241 ACN122000241 ACN 122000241ACN-122000241-A

Abstract

The application relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a fixed contact and a moving assembly, wherein the fixed contact is provided with a fixed contact. The movable assembly comprises a movable spring mechanism, a pushing mechanism, an elastic element and a fastening piece, wherein the movable spring mechanism is provided with a movable contact opposite to the fixed contact, the movable spring mechanism is in elastic fit with the pushing mechanism through the elastic element, the movable spring mechanism can move towards the direction close to the pushing mechanism to squeeze the elastic element, the movable spring mechanism comprises a movable spring and a lower armature, the fastening piece penetrates through the lower armature and is connected with the movable spring so as to fix the lower armature on the movable spring, the fastening piece protrudes out of one side of the movable spring mechanism towards the pushing mechanism and is used for abutting against the pushing mechanism on a path of the movable spring mechanism moving away from the fixed contact when the movable spring mechanism bounces open relative to the fixed contact under the condition of short-circuit current. The high-voltage direct-current relay can achieve the effects of small volume, low cost and high short-circuit current and voltage resistance.

Inventors

DAI WENGUANG
Ren Anrong
CHEN WEIPENG
CHEN SONGSHENG

Assignees

厦门宏发电力电器有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (13)

1. A high-voltage direct-current relay, characterized by comprising the following steps: a stationary contact provided with a stationary contact, and The movable assembly comprises a movable spring mechanism, a pushing mechanism, an elastic element and a fastener, wherein the movable spring mechanism is provided with a movable contact opposite to the fixed contact, the movable spring mechanism is in elastic fit with the pushing mechanism through the elastic element, the movable spring mechanism can move towards the direction close to the pushing mechanism to squeeze the elastic element, the movable spring mechanism comprises a movable spring and a lower armature, the fastener penetrates through the lower armature and is connected with the movable spring so as to fix the lower armature on the movable spring, the fastener protrudes out of one side of the movable spring mechanism towards the pushing mechanism, and when the movable contact and the fixed contact spring open under the action of short-circuit current, the fastener is used for abutting the pushing mechanism on the path of the movable spring mechanism moving towards the direction away from the fixed contact.
2. The high voltage direct current relay according to claim 1, wherein the lower armature comprises a first armature portion and a second armature portion, the first armature portion is located on one side of the movable spring facing the pushing mechanism, the second armature portion is located on the peripheral side of the movable spring relative to the moving direction of the pushing mechanism, and the fastener penetrates the first armature portion and protrudes out of one side of the first armature portion facing away from the movable spring.
3. The high voltage direct current relay according to claim 2, wherein the pushing mechanism comprises a pushing seat and a pushing rod connected to one side of the pushing seat facing away from the moving spring mechanism, the pushing seat is provided with an abutting surface facing the moving spring mechanism, and the fastener is opposite to the abutting surface and can abut against the abutting surface on a path of moving spring mechanism moving away from the fixed contact.
4. A high voltage direct current relay according to claim 3, wherein the elastic element is located between the first armature portion and the pushing seat, and both ends thereof are respectively abutted against the first armature portion and the pushing seat.
5. A high voltage direct current relay according to claim 4, wherein said moving assembly is provided with two said fasteners, one on each axially opposite side of said resilient element.
6. The high-voltage direct current relay according to claim 5, wherein the pushing mechanism further comprises a limiting protrusion protruding from one side of the pushing seat towards the moving spring mechanism, one end of the elastic element is sleeved on the limiting protrusion, and the abutting surface is arranged around the limiting protrusion.
7. A high voltage direct current relay according to claim 3, wherein an end face of the fastener remote from the moving spring mechanism is parallel to the abutment face.
8. A high voltage direct current relay according to any of claims 1-7, wherein said moving assembly further comprises a bracket comprising two first arms, said first arms being located on axially opposite sides of said resilient member, respectively, said first arms being connected to said pushing mechanism and being in sliding engagement with said moving spring mechanism.
9. The high voltage dc relay of claim 8, further comprising an upper armature opposing the lower armature, the upper and lower armatures being capable of being magnetized to attract each other when the movable contact and the stationary contact are opposing; wherein the upper armature is arranged outside the moving component and is fixed relative to the fixed contact, or The support also comprises a second support arm connected with the two first support arms, the second support arm is positioned at one side of the movable spring mechanism, which is opposite to the pushing mechanism, and the upper armature is fixed on the second support arm.
10. The high voltage direct current relay according to any one of claims 1 to 7, wherein the pushing mechanism is capable of driving the moving spring mechanism to move in a direction approaching the stationary contact, so that the high voltage direct current relay has a first state in which the moving contact is just in contact with the stationary contact, and a second state in which the moving contact is abutted against the stationary contact by the elastic element, and the pushing mechanism moves relative to the moving spring mechanism in a direction approaching the stationary contact during switching from the first state to the second state, and a distance between the pushing mechanism and the fastener is smaller in the second state than in the first state.
11. The high voltage direct current relay of claim 10, wherein in the second state, a difference between a length of the resilient element and an ultimate compressed length of the resilient element is greater than a distance between the pushing mechanism and the fastener.
12. The high voltage direct current relay according to claim 10, wherein the moving spring mechanism is capable of springing away from the stationary contact under an electromotive repulsive force generated by a short circuit current to switch the high voltage direct current relay from the second state to a third state, in which the fastener abuts against the pushing mechanism to prevent the moving spring mechanism and the pushing mechanism from approaching each other, and the length of the elastic element is greater than the limit compression length of the elastic element.
13. The high-voltage direct current relay according to any one of claims 1 to 7, further comprising an electromagnetic assembly, wherein the pushing mechanism comprises a pushing seat and a pushing rod connected to one side of the pushing seat facing away from the moving spring mechanism, the moving spring mechanism is elastically matched with the pushing seat through the elastic element, the pushing rod is inserted into the electromagnetic assembly, and the electromagnetic assembly can drive the pushing seat to move towards a direction approaching or away from the fixed contact through the pushing rod.

Description

High-voltage direct-current relay Technical Field The application relates to the technical field of relays, in particular to a high-voltage direct-current relay. Background The high-voltage direct-current relay is used as a novel electric automatic switch, and a normally-open state or a normally-closed state can be realized through electromagnetic holding force. The current high-voltage direct current relay generally comprises an electromagnetic assembly, a movable assembly and a fixed contact, wherein a movable contact arranged on a movable reed of the movable assembly and a fixed contact arranged on the fixed contact are used as a contact part of the high-voltage direct current relay together. The electromagnetic assembly comprises a coil, an upper iron core and a lower iron core, when the coil is electrified, the lower iron core can be magnetized, and the lower iron core and the upper iron core are attracted mutually, so that the moving assembly is driven to be close to the static contact until a moving contact on the moving assembly is contacted with a static contact on the static contact, and the circuit is conducted. However, in the existing high-voltage direct current relay, when a circuit is short-circuited or overloaded, the moving contact and the fixed contact are sprung out due to excessive electric repulsive force, and an arc-pulling phenomenon is generated between the moving contact and the fixed contact, so that the relay is damaged. The miniaturization and short-circuit resistance of high-voltage direct-current relays are increasingly demanded in industries employing high-voltage circuits, such as new energy industries. Disclosure of Invention In view of this, it is necessary to provide a high-voltage dc relay which is easily damaged by the arcing phenomenon between the movable contact and the stationary contact at the time of short circuit and overload. A high voltage dc relay comprising: a stationary contact provided with a stationary contact, and The movable assembly comprises a movable spring mechanism, a pushing mechanism, an elastic element and a fastening piece, wherein the movable spring mechanism is provided with a movable contact opposite to a fixed contact, the movable spring mechanism is in elastic fit with the pushing mechanism through the elastic element, the movable spring mechanism can move towards the direction close to the pushing mechanism to squeeze the elastic element, the movable spring mechanism comprises a movable spring and a lower armature, the fastening piece penetrates through the lower armature and is connected with the movable spring so as to fix the lower armature on the movable spring, the fastening piece protrudes out of one side of the movable spring mechanism, which faces towards the pushing mechanism, and when the movable contact and the fixed contact spring open under the action of short-circuit current, the fastening piece is used for abutting the pushing mechanism on the path of the movable spring mechanism moving away from the fixed contact. According to the high-voltage direct current relay, when a circuit connected with the high-voltage direct current relay is short-circuited or overloaded, the movable contact of the guide actuating spring mechanism and the fixed contact of the fixed contact are sprung out due to electric repulsive force, the movable spring mechanism can compress the elastic element until the fastening piece is abutted against the pushing mechanism to prevent the movable spring mechanism and the pushing mechanism from being relatively close. Because the movable contact and the stationary contact spring open the back, the electronic repulsion between movable contact and the stationary contact disappears, at the in-process that movable spring mechanism moved to fastener butt pushing mechanism towards the direction of keeping away from the stationary contact, elastic component can effectively cushion movable spring mechanism's kinetic energy, and because the support effect of fastener, can shorten movable spring mechanism and the biggest bullet open distance of stationary contact for when fastener butt pushing mechanism, elastic component can not compressed to limit compression length, movable spring mechanism can not be too big to pushing mechanism's impact, avoid leading actuating assembly whole to break away from the stationary contact because of the impact and lead high-voltage direct current relay to damage. Moreover, the abutting of the fastener on the pushing mechanism can prevent the movable spring mechanism from continuing to be far away from the fixed contact, so that the distance between the movable contact and the fixed contact, which is relatively sprung away, is reduced, the buffer of the elastic element is matched to avoid the movable component from separating from the fixed contact, so that the distance between the movable contact and the fixed contact is not too far, and the damage and even explosion of the high-voltage