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CN-224217444-U - Bridge-type loop short-circuit-resistant structure and relay

CN224217444UCN 224217444 UCN224217444 UCN 224217444UCN-224217444-U

Abstract

The utility model discloses a bridge type loop short-circuit resistant structure and a relay, and relates to the technical field of switching devices, wherein the bridge type loop short-circuit resistant structure comprises a fixed contact, a movable contact plate, a push rod assembly, a central spring, a counter-force plate spring and an electromagnetic assembly; the first end of the central spring is connected with the push rod assembly, the second end of the central spring is connected with the movable contact plate, the counter-force piece spring is connected with the movable contact plate and has a preset distance with the push rod assembly, the electromagnetic assembly is connected with the push rod assembly, when the fixed contact is separated from the movable contact plate, the electromagnetic assembly drives the push rod assembly to be close to the fixed contact to enable the movable contact plate to be abutted to the fixed contact, and when the fixed contact is contacted with the movable contact plate, the electromagnetic assembly continues to drive the push rod assembly to be close to the fixed contact to enable the push rod assembly to be abutted to the counter-force piece spring. According to the scheme, the central spring and the counter-force plate spring are sequentially interposed to provide the movable contact plate with reverse elastic force which is adaptive to electromagnetic adsorption acting force, normal operation of contact closing operation can be guaranteed, and meanwhile, larger contact pressure is obtained to resist repulsive force generated when the relay is subjected to short-circuit current.

Inventors

  • HUANG JIAJIAN
  • ZHANG CHAOHONG
  • ZHAO KAIKAI

Assignees

  • 东莞市中汇瑞德电子股份有限公司

Dates

Publication Date
20260508
Application Date
20250418

Claims (10)

  1. 1. A bridge circuit anti-shorting structure, the bridge circuit anti-shorting structure comprising: A stationary contact (1); The movable contact plate (2) is arranged opposite to the fixed contact (1); A push rod assembly (3); A central spring (4), wherein a first end of the central spring (4) is connected with the push rod assembly (3), and a second end of the central spring (4) is connected with the movable contact plate (2); the reaction force piece spring (5), the reaction force piece spring (5) is connected to the movable contact plate (2), and a preset distance exists between the reaction force piece spring (5) and the push rod assembly (3); And when the stationary contact (1) is contacted with the movable contact (2), the electromagnetic assembly (6) is used for continuously driving the push rod assembly (3) to be close to the stationary contact (1) so as to enable the movable contact (2) to be abutted against the stationary contact (1), thereby applying a first abutting force towards the stationary contact (1) to the movable contact (2) through the elastic acting force of the central spring (4), and after the stationary contact (1) is contacted with the movable contact (2), the electromagnetic assembly (6) is used for continuously driving the push rod assembly (3) to be close to the stationary contact (1) so as to enable the push rod assembly (3) to be abutted against the counter-force sheet spring (5), thereby applying a second abutting force towards the stationary contact (1) to the movable contact (2) through the elastic acting force of the counter-force sheet spring (5).
  2. 2. Bridge circuit anti-short structure according to claim 1, characterized in that the reaction plate spring (5) has a connecting portion (51) and a supporting portion (52), the connecting portion (51) being connected to the movable contact plate (2), the supporting portion (52) extending in a first direction, a first end of the supporting portion (52) being connected to the connecting portion (51), a second end of the supporting portion (52) being adapted to abut against the push rod assembly (3).
  3. 3. Bridge circuit anti-short structure according to claim 2, characterized in that it comprises at least two said counter-force leaf springs (5), at least two said counter-force leaf springs (5) being spaced around said central spring (4).
  4. 4. A bridge circuit anti-short circuit structure according to claim 3, characterized in that said connection portions (51) of at least two of said reaction plate springs (5) are connected to form an integral structure.
  5. 5. Bridge-circuit anti-short structure according to claim 2, characterized in that the direction of the push rod assembly (3) approaching the stationary contact (1) is taken as the closing direction, the first direction having a first component and a second component perpendicular to each other, the first component being parallel to the closing direction and the second component being perpendicular to the closing direction.
  6. 6. The bridge circuit anti-short structure according to claim 5, characterized in that the distance between the first end of the support (52) and the central axis of the push rod assembly (3) is smaller than the distance between the second end of the support (52) and the central axis of the push rod assembly (3); Or the distance between the first end of the supporting part (52) and the central axis of the push rod assembly (3) is larger than the distance between the second end of the supporting part (52) and the central axis of the push rod assembly (3).
  7. 7. Bridge-circuit anti-short structure according to claim 2, characterized in that the second end of the support (52) is provided with a bending structure (521), the bending structure (521) being intended to abut against the push rod assembly (3); and/or the connecting part (51) is connected to the movable contact plate (2) in at least one connecting mode of riveting, welding and threaded connection.
  8. 8. The bridge circuit short-circuit resistant structure according to claim 1, wherein the push rod assembly (3) comprises a push rod body (31) and a supporting plate (32), the push rod body (31) is connected with the electromagnetic assembly (6), the supporting plate (32) is connected to the push rod body (31), the supporting plate (32) is connected with the first end of the central spring (4), a preset interval exists between the supporting plate (32) and the counter force plate spring (5), and the electromagnetic assembly (6) is used for driving the push rod body (31) to be close to the stationary contact (1) after the stationary contact (1) is contacted with the movable contact plate (2) so as to enable the supporting plate (32) to be abutted with the counter force plate spring (5); And/or the bridge circuit short circuit resistance structure further comprises a limiting piece (7), wherein the limiting piece (7) is connected to the push rod assembly (3), when the stationary contact (1) is separated from the movable contact plate (2), the movable contact plate (2) is abutted to the limiting piece (7) under the elastic acting force of the central spring (4), and when the stationary contact (1) is contacted with the movable contact plate (2), the movable contact plate (2) is separated from the limiting piece (7).
  9. 9. The bridge circuit short-circuit resistant structure according to claim 1, further comprising a yoke (8), wherein the yoke (8) is connected to a side of the movable contact plate (2) facing away from the stationary contact (1), the reaction force sheet spring (5) is disposed on a side of the yoke (8) facing away from the movable contact plate (2), and the second end of the central spring (4) abuts against the reaction force sheet spring (5) to press the reaction force sheet spring (5) onto the yoke (8).
  10. 10. A relay comprising a bridge circuit anti-shorting structure as claimed in any one of claims 1 to 9.

Description

Bridge-type loop short-circuit-resistant structure and relay Technical Field The utility model relates to the technical field of switching devices, in particular to a bridge circuit short-circuit-resistant structure and a relay. Background Along with the rapid development of new energy industry, the requirements of enterprises on relays are higher and higher, and on the basis of keeping the characteristics of smaller volume and smaller coil power, the relay product is required to bear high voltage and high current, and the relay product is also required to have low contact resistance, strong breaking capacity and high short-circuit resistance. When the relay is subjected to short-circuit current, a repulsive force is easily generated between the fixed contact and the movable contact to spring the movable contact and the fixed contact, so that the problem of attraction rebound occurs, arc leakage is caused, and even explosion of the relay can be caused. Therefore, it is important to improve the resistance between the stationary contact and the movable contact. At present, a relay product generally adopts a mode of increasing electromagnetic adsorption acting force of an induction coil to improve contact pressure between a fixed contact and a movable contact so as to resist repulsive force generated by short-circuit current. However, the small increase of the electromagnetic adsorption force will cause the double increase of the size and the power of the induction coil, thereby greatly increasing the cost of the relay, being poor in cost efficiency and being unfavorable for the development of the relay product in the miniaturization and portability directions. Disclosure of utility model The utility model mainly aims to provide a bridge type loop short-circuit resistant structure, which aims to solve the technical problems that the current mode of increasing the contact pressure by increasing the electromagnetic adsorption acting force of an induction coil is poor in cost effectiveness and is unfavorable for the development of relay products in the miniaturization and portability directions. In order to achieve the above object, the bridge loop anti-short circuit structure provided by the present utility model includes: a stationary contact; The movable contact plate is arranged opposite to the fixed contact; a push rod assembly; The first end of the central spring is connected with the push rod assembly, and the second end of the central spring is connected with the movable contact plate; the reaction plate spring is connected to the movable contact plate, and a preset distance exists between the reaction plate spring and the push rod assembly; The electromagnetic assembly is used for driving the push rod assembly to be close to the fixed contact when the fixed contact is separated from the movable contact plate, so that the movable contact plate is abutted against the fixed contact, a first abutting force towards the fixed contact is applied to the movable contact plate through elastic acting force of the central spring, and the electromagnetic assembly is used for continuously driving the push rod assembly to be close to the fixed contact after the fixed contact is contacted with the movable contact plate, so that the push rod assembly is abutted against the counter-force plate spring, and a second abutting force towards the fixed contact is applied to the movable contact plate through elastic acting force of the counter-force plate spring. In an embodiment, the reaction force plate spring is provided with a connecting portion and a supporting portion, the connecting portion is connected to the movable contact plate, the supporting portion extends along a first direction, a first end of the supporting portion is connected with the connecting portion, and a second end of the supporting portion is used for being abutted to the push rod assembly. In one embodiment, the bridge circuit anti-short circuit structure comprises at least two reaction plate springs, and the at least two reaction plate springs are arranged around the central spring at intervals. In one embodiment, the connecting portions of at least two of the reaction force leaf springs are connected to form an integral structure. In one embodiment, the direction of the push rod assembly close to the stationary contact is taken as a closing direction, and the first direction has a first component and a second component which are perpendicular to each other, wherein the first component is parallel to the closing direction, and the second component is perpendicular to the closing direction. In one embodiment, the distance between the first end of the support portion and the central axis of the push rod assembly is smaller than the distance between the second end of the support portion and the central axis of the push rod assembly. In one embodiment, the distance between the first end of the support portion and the central axis of the push rod assembly