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CN-121983472-A - Movable contact assembly and relay

CN121983472ACN 121983472 ACN121983472 ACN 121983472ACN-121983472-A

Abstract

The invention discloses a movable contact assembly and a relay, and relates to the technical field of relays, wherein the movable contact assembly comprises a spring plate, at least two connecting points are arranged along the direction perpendicular to a rotation axis of the spring plate, movable reeds are stacked and arranged with the spring plate, two ends of the length direction of each movable reed are fixedly connected with different connecting points respectively, movable contacts are fixedly arranged at one ends of the movable reeds far away from the rotation axis of the spring plate, the thermal expansion coefficient of the spring plate is larger than that of the movable reeds, and the movable contact assembly and the relay can effectively solve the problem of poor contact between the movable contact and a fixed contact of the relay caused by thermal expansion deformation of the movable reeds.

Inventors

  • WU GUOHUA
  • TAO XINYI
  • Shao Rongxia
  • FANG XU
  • YUE WEIMIN
  • ZHU HAOHUI
  • HU QILIANG

Assignees

  • 浙江美硕电气科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260401

Claims (10)

  1. 1. A movable contact assembly rotatably mounted to a relay, comprising: A spring plate (11) provided with at least two connection points along a direction perpendicular to the rotation axis thereof; The movable reed (12) is overlapped with the spring plate (11), and two ends of the movable reed (12) in the length direction are fixedly connected with different connecting points respectively; a movable contact (14) fixedly arranged at one end of the movable reed (12) far away from the rotation axis of the spring plate (11); Wherein the thermal expansion coefficient of the spring plate (11) is larger than that of the movable reed (12).
  2. 2. The movable contact assembly according to claim 1, wherein the spring plate (11) is a high thermal expansion elastic steel spring plate, and the movable reed (12) is a copper reed.
  3. 3. A movable contact assembly according to claim 1, characterized in that the movable spring (12) comprises a plurality of stacked springs, the springs comprise connecting ends, and at least two connecting ends independently abut against a conductive connecting wire assembly (13).
  4. 4. A movable contact assembly according to claim 3, wherein a plurality of the connection ends in the movable reed (12) are arranged in a step shape, and the connection ends of adjacent reeds are partially overlapped.
  5. 5. The movable contact assembly according to claim 1, characterized in that a riveting hole is arranged at a position where the movable reed (12) is welded with the connecting point of the spring plate (11) or corresponds to the connecting point, and the movable contact (14) is arranged in the riveting hole far away from the rotation axis of the spring plate (11) and used for riveting the movable reed (12) and the spring plate (11).
  6. 6. The movable contact assembly according to any one of claims 1-5, characterized in that the spring plate (11) comprises an overtravel spring plate (111) for abutment with the driving part of the relay; The overtravel spring (111) is integrally formed with the spring plate (11) in cantilever fashion.
  7. 7. The movable contact assembly according to claim 6, wherein the overtravel spring (111) comprises an arc cantilever section (1111), an extrados of the arc cantilever section (1111) is used for abutting against the driving part, and a reserved deformation space is arranged between a free end of the arc cantilever section (1111) and a surface of an adjacent spring plate (11) or movable spring (12).
  8. 8. The movable contact assembly according to claim 7, wherein a straight cantilever section (1112) is arranged at the free end of the overtravel spring sheet (111), and when the free end of the overtravel spring sheet (111) abuts against the spring plate (11) or the movable spring sheet (12) at the corresponding position, the straight cantilever section (1112) is attached to the spring plate (11) or the movable spring sheet (12); The free end of the overtravel spring piece (111) or the straight cantilever section (1112) is provided with an upturned cantilever section (1113).
  9. 9. The movable contact assembly according to claim 6, wherein the spring plates (11) at corresponding positions on both sides of the overtravel spring plate (111) are provided with second pivot holes (1131) for rotatably mounting the driving part, the second pivot holes (1131) are bar-shaped holes, and the length direction of the bar-shaped holes is consistent with the rotation direction of the spring plates (11).
  10. 10. A relay comprising a movable contact assembly according to any one of claims 1 to 9.

Description

Movable contact assembly and relay Technical Field The invention relates to the technical field of relays, in particular to a movable contact assembly and a relay. Background The movable contact assembly of the existing relay generally adopts a plurality of movable reeds to be stacked so as to increase the current carrying capacity of the movable contact assembly, and in order to reduce the influence of different elastic deformation amounts of the movable reeds of different stacks on the overall form of the movable contact assembly when the movable contact assembly is deformed, a reserved gap is generally arranged between the different movable reeds so as to eliminate the influence of different deformation amounts of the movable reeds on the form of the movable contact assembly; However, when a large current passes through the movable contact assembly, the movable contact assembly generates heat to generate larger heat, so that the movable spring is subject to thermal expansion deformation, and the movable spring is subject to the stacking arrangement mode of reserved gaps, so that after the movable spring is elastically deformed, the gaps among different lamination springs are uneven, namely, the heat dissipation capacities of the different lamination springs are different, the heat is carried by the movable contact assembly in practice, so that the thermal expansion deformation of the different lamination springs is different, the difference of the thermal expansion deformation of the different lamination springs has randomness, the posture change of the movable contact assembly is uncontrollable, the actual position of the movable contact is influenced, and the problem of poor contact between the movable contact and the fixed contact of the relay is caused. In summary, how to solve the problem of poor contact between the movable contact and the stationary contact of the relay caused by thermal expansion deformation of the movable reed is a problem to be solved by those skilled in the art. Disclosure of Invention Therefore, the invention aims to provide the movable contact assembly and the relay, which can effectively solve the problem of poor contact between the movable contact and the fixed contact of the relay caused by thermal expansion deformation of the movable reed. In order to achieve the above object, the present invention provides the following technical solutions: A movable contact assembly rotatably mounted to the relay; The movable contact assembly comprises: The spring plate is provided with at least two connecting points along the direction perpendicular to the rotation axis of the spring plate; the movable reed is overlapped with the spring plate, and two ends of the movable reed in the length direction are fixedly connected with different connecting points respectively; The movable contact is fixedly arranged at one end of the movable reed, which is far away from the rotation axis of the spring plate; wherein, the coefficient of thermal expansion of the spring plate is larger than that of the movable reed. In some technical solutions, the spring plate is a high thermal expansion elastic steel spring plate, and the movable reed is a copper reed. In some technical schemes, the movable reed comprises a plurality of reeds which are stacked, and at least two connecting ends are independently abutted to the conductive connecting wire assembly. In some technical schemes, the connecting ends in the movable reed are arranged in a step shape, and the connecting ends of adjacent reeds are partially overlapped. In some technical schemes, a riveting hole is formed in a position where the movable reed is welded with the connection point of the spring plate or corresponds to the connection point, and the movable contact is arranged in the riveting hole far away from the rotation axis of the spring plate and used for riveting the movable reed and the spring plate. In some embodiments, the spring plate includes an overtravel spring for abutting against a driving portion of the relay; The over-travel spring plate is integrally formed with the spring plate in a cantilever mode. In some technical schemes, the overtravel elastic sheet comprises an arc cantilever section, an outer cambered surface of the arc cantilever section is used for being abutted to the driving part, and a reserved deformation space is arranged between the free end of the arc cantilever section and the surface of the adjacent spring plate or the movable spring plate. In some technical schemes, the free end of the overtravel elastic piece is provided with a straight cantilever section, and when the free end of the overtravel elastic piece is abutted against the spring plate or the movable reed at the corresponding position, the straight cantilever section is attached to the spring plate or the movable reed; the free end of the overtravel elastic sheet or the flat cantilever section is provided with an upturned cantilever section. In some