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EP-4207227-B1 - ELECTROMAGNET DRIVING MECHANISM, ASSEMBLY AND DUAL POWER AUTOMATIC TRANSFER SWITCH

EP4207227B1EP 4207227 B1EP4207227 B1EP 4207227B1EP-4207227-B1

Inventors

  • WU, JIAN
  • LIU, ZHENZHONG
  • MAO, Shunxian
  • YU, GANG

Dates

Publication Date
20260506
Application Date
20221227

Claims (15)

  1. An electromagnet driving mechanism (100), comprising a mechanism frame (140); a stationary core (130), fixedly installed relative to the mechanism frame (140); a movable core (120), being movable in a longitudinal direction relative to the stationary core (130) and comprising a moving stroke between a first position away from the stationary core (130) and a second position in contact with the stationary core (130), wherein the moving stroke comprises an approaching stroke section; a coil, coupled with the stationary core (130) and/or the movable core (120), wherein the coil generates a magnetic attraction force between the stationary core (130) and the movable core (120) upon being energized to drive the movable core (120) to move towards the second position; a reset spring member (112), connected to the movable core (120) and applying a reset spring force to the movable core (120) during the moving stroke of the movable core (120); characterised by a reset auxiliary assembly (150), comprising a push member and a reset auxiliary spring (154) connected with the push member (162), wherein the reset auxiliary assembly (150) is configured to interact with the movable core (120) in the approaching stroke section, so that the reset auxiliary spring (154) applies a reset auxiliary spring force to the movable core (120) in the approaching stroke section through the push member (162).
  2. The electromagnet driving mechanism according to claim 1, characterized in that the mechanism frame (140) comprises a bottom plate (142), the bottom plate comprises a first surface facing the movable core (120) and a second surface away from the movable core (120), and the stationary core (130) is fixedly installed on the first surface of the bottom plate (142) and comprises a stationary core surface facing the movable core (120), the stationary core (130) and the bottom plate (142) comprise aligned holes (132, 142 a), and the push member (162) is configured to extend through the aligned holes (132, 142a) of the stationary core (130) and the bottom plate (142) and beyond the stationary core surface of the stationary core (130).
  3. The electromagnet driving mechanism according to claim 2, characterized in that the hole (132) of the stationary core (130) is a central hole of the stationary core (130).
  4. The electromagnet driving mechanism according to any one of claims 1-3, characterized in that the reset auxiliary assembly (150) further comprises an assembly frame (156) fixedly connected to the second surface of the mechanism frame (140), the assembly frame (156) comprises a bottom plate (1562) spaced apart from the bottom plate (142) of the mechanism frame (140), and the reset auxiliary spring (154) abuts against the bottom plate (1562) of the assembly frame (156) for applying a spring force to the push member (162).
  5. The electromagnet driving mechanism according to claim 4, characterized in that the push member (162) comprises a first end portion and a rod portion connected with and extending from the first end portion, and the reset auxiliary spring (154) surrounds the rod portion of the push member (162), and one end of the reset auxiliary spring (154) abuts against the bottom plate (1562) of the assembly frame (156) and the other end of the reset auxiliary spring (154) abuts against the first end portion of the push member (162) to apply a spring force to the first end portion of the push member (162).
  6. The electromagnet driving mechanism according to any one of claim 4 or 5 , characterized in that the push member (162) further comprises a second end portion connected with the rod portion, and the bottom plate (1562) of the assembly frame (156) comprises a through hole, the rod portion of the push member (162) passes through the through hole.
  7. The electromagnet driving mechanism according to any one claim 1-6, characterized in that the push member (162) comprises a driving member (152) and a bolt member (158), the driving member (152) comprises the first end portion and a driving rod (1526) connected with the first end portion, the bolt member (158) comprises the second end portion and a threaded rod portion (1586) connected with the second end portion, the driving rod (1526) of the driving member comprises a threaded hole (1528), and the threaded rod portion (1586) of the bolt member is screwed into the threaded hole (1528) of the driving rod (1526) of the driving member (152).
  8. The electromagnet driving mechanism according to claim 1, characterized by further comprising a movable core pull rod (110), connected to and moves with the movable core (120), and the reset spring member (112) is connected to the movable core (120) through the movable core pull rod (110).
  9. The electromagnet driving mechanism according to any one of claims 1-8, characterized in that a length of the approaching stroke section is in a range from 1mm to 5 mm.
  10. The electromagnet driving mechanism according to any one of claims 1-9, characterized in that a distance between the movable core (120) and the stationary core (130) in the approaching stroke section is less than or equal to one tenth of a distance between the movable core (120) and the stationary core (130) in the first position.
  11. The electromagnet driving mechanism according to any one of claims 1-10, characterized in that the stationary core (130), the movable core (120), the reset spring member (112), the push member (162), and the reset auxiliary spring (154) are arranged in a straight line in the longitudinal direction.
  12. The electromagnet driving mechanism according to any one of claims 1-11, characterized in that the movable core (120) is columnar, and the mechanism frame (140) comprises an orientation hole matched with a shape of an outer periphery of the movable core (120), and the orientation hole surrounds the outer periphery of the movable core (120) during the moving stroke of the movable core (120).
  13. An electromagnet driving mechanism assembly (10), characterized by comprising: a support structure (12), comprising one or more bifurcated portions (14, 14a); and one or more electromagnet driving mechanisms, wherein each of the one or more electromagnet driving mechanisms is connected to a corresponding one of the one or more bifurcated portions (14, 14a), at least one of the one or more electromagnet driving mechanisms is the electromagnet driving mechanism (100) according to any one of claims 1-12.
  14. The electromagnet driving mechanism assembly according to claim 13, characterized in that the support structure (12) comprises two bifurcated portions (14, 14a) and two electromagnet driving mechanisms.
  15. A dual power automatic transfer switch (20), characterized by comprising: the electromagnet driving mechanism assembly (10) according to claim 13 or 14; a first stationary contact (26a) and a second stationary contact (26b) which are spaced apart; a movable contact (24a), being movable among a first contact portion contacting the first stationary contact (26a), a double-separation position not contacting the first stationary contact (26a) and the second stationary contact (26b), and a second contact position contacting the second stationary contact (26b); and a linkage mechanism, connected with the electromagnet driving mechanism assembly (10) and the movable contact (24a), wherein an actuating action of the electromagnet driving mechanism assembly (10) drives the movable contact (24a) to move among the first contact position, the double-separation position and the second contact position through the linkage mechanism.

Description

TECHNICAL FIELD The present disclosure relates to an electromagnet driving mechanism, an electromagnet driving mechanism assembly and a dual power automatic transfer switch including the electromagnet driving mechanism. More specifically, the present disclosure relates to an electromagnet driving mechanism with a reset auxiliary assembly, an electromagnet driving mechanism assembly including the electromagnet driving mechanism, and a dual power automatic transfer switch including the electromagnet driving mechanism assembly. BACKGROUND Dual power automatic transfer switch is widely used in emergency power supply system. The dual power automatic transfer switch can automatically switch a load circuit from one power supply to another power supply based on the status of the power supply circuit, such as switching between a commercial power supply and a standby power supply, so as to ensure the continuous power supply of the load circuit upon the commercial power supply being cut off. CN 213 025 884 U provides an operating mechanism and a dual power automatic transfer switch. The dual power automatic transfer switch is symmetrically arranged. CN 110 364 378 A discloses a mechanism for a dual power automatic transfer switch to provide a bi-position changeover by securely locking a center wheel in a double-separation position. For a three-station dual power automatic transfer switch, when the power is being switched, an electromagnet drive mechanism of the three-station dual power automatic transfer switch drives the movable contact to switch among a first power close position, a double separation position and a second power close position, thus realizing the power switch. At present, in many three-station dual power automatic transfer switches, the electromagnet drive mechanism needs to drive twice successively when the power supply is being switched. The first drive causes the movable contact switch from the first power supply close position to the double separation position, and the second drive causes the movable contact switch from the double separation position to the second power supply close position. The advantage of this driving mode is that the volume and power consumption of electromagnet are smaller than those of similar products. Fig. 1 shows a driving voltage signal diagram of this driving mode. As shown in the figure, the duration of the first driving signal is T1, the duration of the second driving signal is T2, and there is a time interval T3 between the first driving signal and the second driving signal. After the first actuation, the movable core of the electromagnet drive mechanism needs to be reset to the initial position in time interval T3 to prepare for the second actuation. However, due to various reasons, such as the residual electromagnetic force of the electromagnet drive mechanism after the first actuation, the movable core can't be quickly reset to the initial position, which can't meet the requirements of the dual power automatic transfer switch for transfer time. Therefore, there is a need for an improved electromagnet driving mechanism and dual power automatic transfer switch, which can quickly reset the movable core to the initial position and meet the requirements of the transfer time for the dual power automatic transfer switch. SUMMARY The present disclosure aims at overcoming at least some of the above problems in the existing art. An aspect according to the present disclosure provides an electromagnet driving mechanism, which includes: a mechanism frame;a stationary core, fixedly installed relative to the mechanism frame;a movable core, being movable in a longitudinal direction relative to the stationary core and including a moving stroke between a first position away from the stationary core and a second position in contact with the stationary core, wherein the moving stroke includes an approaching stroke section;a coil, coupled with the stationary core and/or the movable core, wherein the coil generates a magnetic attraction force between the stationary core and the movable core upon being energized to drive the movable core to move towards the second position;a reset spring member, connected to the movable core and applying a reset spring force to the movable core during the moving stroke of the movable core; anda reset auxiliary assembly, including a push member and a reset auxiliary spring connected with the push member, wherein the reset auxiliary assembly is configured to interact with the movable core in the approaching stroke section, so that the reset auxiliary spring applies a reset auxiliary spring force to the movable core in the approaching stroke section through the push member. According to one or more embodiments of the present disclosure, the mechanism frame includes a bottom plate, the bottom plate includes a first surface facing the movable core and a second surface away from the movable core, and the stationary core is fixedly installed on the first sur