CN-117219469-B - Electromagnetic relay resistant to short-circuit current

CN117219469BCN 117219469 BCN117219469 BCN 117219469BCN-117219469-B

Abstract

The invention discloses an electromagnetic relay resistant to short-circuit current, which comprises a magnetic circuit system and at least one contact unit, wherein the contact unit comprises a movable spring part and two static spring parts which are arranged side by side, the movable spring part is arranged on an armature part of the magnetic circuit system and is matched with the two static spring parts, each static spring part comprises a static spring leading-out sheet and a static spring, one end of each static spring is electrically connected with the static spring leading-out sheet, the other end of each static spring is provided with a static contact, the current flowing directions of the static spring and the static spring leading-out sheet are opposite, the movable spring part comprises a conducting sheet and an elastic piece, the elastic piece is connected to the armature part, the conducting sheet is connected to the elastic piece, and movable contacts are respectively arranged on positions, corresponding to the static contacts of the two static spring parts, of the conducting sheet. The invention can make the static reed shorter, so that the invention is suitable for electromagnetic relay with compact structure and small volume.

Inventors

ZHANG MAOSONG
TAN ZHONGHUA
ZHU YIQING
FU FEIFEI
Hong Fangang

Assignees

漳州宏发电声有限公司

Dates

Publication Date: 20260512
Application Date: 20230927

Claims (10)

1. An electromagnetic relay for resisting short-circuit current comprises a magnetic circuit system and a contact system, wherein the wiring system comprises at least one contact unit, the contact unit comprises a movable spring part and two static spring parts which are arranged side by side, the movable spring part is arranged on an armature part of the magnetic circuit system and is matched with the two static spring parts, and the electromagnetic relay is characterized in that each static spring part comprises a static spring leading-out sheet and a static spring, one end of the static spring is electrically connected with the static spring leading-out sheet, the other end of the static spring is provided with a static contact, and the current flowing directions of the static spring and the static spring leading-out sheet are opposite; the static reed is a thin rigid sheet with the thickness smaller than that of the static reed leading-out sheet, and cannot deform in the overtravel stage in the contact closing process, and when short-circuit current occurs, the static reed can elastically deform to a certain extent towards the movable reed part, so that the movable contact and the static contact cannot be separated under the short-circuit current.
2. The electromagnetic relay according to claim 1, wherein the armature portion has an L-shape, one side of the armature portion and the conductive piece are connected to the same side of the elastic member, and a predetermined distance is provided between one side of the armature portion and the conductive piece.
3. The electromagnetic relay according to claim 1, wherein the static spring lead-out piece and the static spring piece form a U-shaped or V-shaped loop, the elastic piece is sheet-shaped, the elastic piece is made of stainless steel, and the conductive piece is rigid.
4. The electromagnetic relay according to claim 1, further comprising a base, wherein the magnetic circuit and the stationary spring lead-out piece are disposed on the base, a first partition wall is disposed between the two stationary spring portions, the top end of the first partition wall is higher than the top end of the stationary spring portion, and one side of the first partition wall facing the movable spring portion protrudes from the stationary contact, so that an air gap between the two stationary spring portions is not less than 3.6mm.
5. The electromagnetic relay of claim 4 wherein the contact gap between the movable contact and the stationary contact in the open state is greater than or equal to 1.8 mm, the thickness of the movable contact being greater than the thickness of the stationary contact.
6. The electromagnetic relay of claim 4 wherein the distance between the first spacer and the conductive piece is greater than or equal to 0.5mm after the movable contact and the stationary contact are closed.
7. The electromagnetic relay according to claim 1, wherein the number of the contact units is plural, the contact units are arranged side by side, the electromagnetic relay further comprises a base, the magnetic circuit system and the static spring leading-out piece are arranged on the base, and a second partition wall is arranged between the adjacent contact units, and the top end of the second partition wall is higher than the top end of the static spring part.
8. The electromagnetic relay according to claim 7, wherein the number of the contact units is two, wherein the two static spring leading pieces of one contact unit sequentially form a first leading portion and a second leading portion penetrating through the base by bending, the two static spring leading pieces of the other contact unit sequentially form a third leading portion and a fourth leading portion penetrating through the base by bending, the first leading portion and the second leading portion respectively protrude toward one side of the static spring portion facing the movable spring portion, and the first leading portion and the second leading portion are respectively located at two ends of the contact system in an arrangement direction of the two contact units thereof, the third leading portion and the fourth leading portion respectively protrude toward one side of the static spring portion facing away from the movable spring portion, and the third leading portion and the fourth leading portion are respectively located at two ends of the contact system in an arrangement direction of the two contact units thereof.
9. The electromagnetic relay according to claim 8, wherein an upstream portion of the third lead-out portion or the fourth lead-out portion is an extension portion extending in the arrangement direction, the extension portion being located on a side of the two stationary spring portions of the one contact unit facing away from the movable spring portion, and the base is provided with a third partition wall between the extension portion and the two stationary spring portions of the one contact unit.
10. The electromagnetic relay of claim 1 further comprising an auxiliary contact assembly comprising an auxiliary movable spring and an auxiliary static spring cooperating with each other, the auxiliary movable spring being driven by the armature portion, the auxiliary contact assembly being in a state opposite to the state of the contact system.

Description

Electromagnetic relay resistant to short-circuit current Technical Field The invention relates to the technical field of relays, in particular to an electromagnetic relay resistant to short-circuit current. Background The relay is an automatic switching element with an isolation function, is widely applied to household appliances, remote control, remote measurement, communication, automatic control, electromechanical integration and power electronic equipment, is one of the most important control elements, and plays roles of automatic adjustment, safety protection, a switching circuit and the like in a control circuit. The traditional electromagnetic relay has low short-circuit current resistance, and when short-circuit current passes, contacts are easily repelled under the action of Hall force, so that the contacts are opened or the bonding of the contacts is invalid. For this reason, in the prior art, an electromagnetic relay with a short-circuit current resistance function appears, and at present, most of structures for short-circuit current resistance of the relay are arranged on a movable spring part, and additional transmission components (such as a push card) are required to be added, so that not only are costs and difficulty in assembling the structure increased, but also the relay is not suitable for an electromagnetic relay with a compact structure and a small volume. Some relays are also provided with a structure for resisting short-circuit current on the static spring part, so that the static spring part forms a U-shaped loop, and Lorentz force towards the movable spring part is generated in a contact closed state and can resist the Hall force born by the static contact, so that the static contact and the movable contact are not easy to repel when the relay passes through short-circuit current, and the capability of resisting short-circuit current of the relay is improved. The relay with the structure for resisting short-circuit current arranged on the static spring part does not need to adopt an additional transmission part, is beneficial to reducing the cost and the structure assembly difficulty, but is still not suitable for electromagnetic relays with compact structures and small volumes. The static spring part has the function of resisting short-circuit current and also has the function of realizing the overtravel of the contact, so that the static spring of the static spring part needs to be made longer and even higher than a magnetic circuit system, has better flexibility and can deform after the contact is contacted. The size of the relay in the length direction of the static reed is larger by making the static reed longer, so that miniaturization of the product is not utilized. In addition, when there are multiple sets of contacts, a certain air gap and creepage distance are required between the different sets of contacts, and when the height of the relay is unchanged, if the static spring leading-out sheet and the static spring are designed to be longer, the air gap and creepage distance between the different sets are insufficient. Disclosure of Invention Aiming at the technical problems existing in the prior art, the invention provides an electromagnetic relay resistant to short-circuit current, which enables the length of a static reed to be made shorter on the basis of realizing short-circuit current resistance and contact overstroke, thereby being beneficial to miniaturization of products and being more convenient for meeting the standard requirements of air gaps and creepage distances among different groups under the condition that the products are provided with a plurality of groups of contacts. The electromagnetic relay comprises a magnetic circuit system and at least one contact unit, wherein the contact unit comprises a movable spring part and two static spring parts which are arranged side by side, the movable spring part is arranged on an armature part of the magnetic circuit system and is matched with the two static spring parts, each static spring part comprises a static spring leading-out sheet and a static spring, one end of the static spring is electrically connected with the static spring leading-out sheet, the other end of the static spring is provided with a static contact, the current flowing directions of the static spring and the static spring leading-out sheet are opposite, the movable spring part comprises a conducting sheet and an elastic piece, the elastic piece is connected to the armature part, the conducting sheet is connected to the elastic piece, and movable contacts are respectively arranged on the conducting sheet corresponding to the static contacts of the two static spring parts. Furthermore, the armature part is L-shaped, one side of the armature part and the conducting plate are connected to the same side of the elastic piece, and a preset distance is reserved between one side of the armature part and the conducting plate. Further, the static reed i