An electromagnetic drive device and a switching device

Abstract

An electromagnetic drive device and a switching device are disclosed, comprising a first electromagnetic drive device and a second electromagnetic drive device. The first and second electromagnetic drive devices share a first moving iron core. In the initial position, the first moving iron core is located adjacent to the first and second electromagnetic drive devices. The first and second electromagnetic drive devices respectively drive the first moving iron core to move in opposite directions. This electromagnetic drive device is applied in a switching device. The electromagnetic drive device and the switching device enable state switching between three working positions.

Description

Technical Field

[0001] This invention relates to the field of power control, specifically to an electromagnetic drive device and a switching device capable of displacement in different directions. Background Technology

[0002] The electromagnetic drive mechanism in a typical switching device can only switch between two positions: on and off. When multiple positions are required, such as two on positions in different directions, it becomes difficult to meet the needs. For example, existing electromagnetic drive mechanisms cannot switch between two circuits. Summary of the Invention

[0003] The purpose of this invention is to provide an electromagnetic drive device and a switching device that can achieve linear displacement in different directions, i.e., drive in different directions, and can remain inactive in the initial position, thereby realizing state switching between three workstation states.

[0004] To achieve the above objectives, the present invention provides an electromagnetic drive device, comprising a first electromagnetic drive device and a second electromagnetic drive device. The first and second electromagnetic drive devices share a first moving iron core. In the initial position, the first moving iron core is located adjacent to the first and second electromagnetic drive devices. A central magnetic yoke plate is provided between the first and second electromagnetic drive devices. The first and second electromagnetic drive devices respectively drive the first moving iron core to move in opposite directions.

[0005] Preferably, a retractable limiting device is provided on the outside of the first electromagnetic drive device and the second electromagnetic drive device, the limiting device passing through the space between the first electromagnetic drive device and the second electromagnetic drive device to define the initial position of the first moving iron core.

[0006] Preferably, the device includes a magnetic yoke plate and a first U-shaped magnetic yoke, the magnetic yoke plate being mounted on the first U-shaped magnetic yoke, and the first electromagnetic drive device and the second electromagnetic drive device being stacked between the magnetic yoke plate and the first U-shaped magnetic yoke.

[0007] Preferably, the first electromagnetic drive device includes a first coil, a first stationary iron core, and a first return spring; the second electromagnetic drive device includes a second coil, a second stationary iron core, and a second return spring; the first coil and the second coil are arranged adjacent to each other and their hollow portions are connected to form a displacement channel, and the first moving iron core is located in the displacement channel; the first stationary iron core and the second stationary iron core are respectively located at opposite ends of the first coil and the second coil; the first return spring is disposed between the first moving iron core and the first stationary iron core, and the second return spring is disposed between the first moving iron core and the second stationary iron core; the central magnetic yoke plate is disposed between the first coil and the second coil.

[0008] Preferably, the limiting device includes a retractable limiting rod and a limiting drive mechanism for driving the limiting rod to extend or retract, wherein the limiting rod passes between the first electromagnetic drive device and the second electromagnetic drive device to define the initial position of the first moving iron core.

[0009] Preferably, the limiting drive mechanism includes a limiting coil, a second moving iron core, a third stationary iron core, and a third return spring. The limiting coil is located outside the first electromagnetic drive device and the second electromagnetic drive device. The third stationary iron core is located at the end of the limiting coil away from the first moving iron core. The third return spring is disposed between the second moving iron core and the third stationary iron core. One end of the limiting rod is fixedly disposed on the second moving iron core, and the other end passes through the space between the first electromagnetic drive device and the second electromagnetic drive device and abuts against the outer surface of the first moving iron core to limit the initial position of the first moving iron core.

[0010] Preferably, a second U-shaped magnetic yoke is provided outside the magnetic yoke plate and the first U-shaped magnetic yoke. The second U-shaped magnetic yoke is connected to the magnetic yoke plate and the first U-shaped magnetic yoke respectively. A limiting coil is provided between the second U-shaped magnetic yoke and the coil frame of the first coil and the second coil.

[0011] Preferably, a limiting groove is provided on the outer surface of the first moving iron core, and one end of the limiting rod abuts in the limiting groove.

[0012] Preferably, the two ends of the first moving iron core are located in the hollow portions of the first coil and the second coil, respectively. When the first moving iron core is displaced, the first moving iron core abuts against the limiting rod, so that the limiting rod is located outside the displacement channel.

[0013] Preferably, the limiting rod and the central magnetic yoke plate are designed to be on the same plane.

[0014] Preferably, a drive rod is provided on the first moving iron core, and the drive rod passes through the first stationary iron core and / or the second stationary iron core.

[0015] The present invention also provides a switching device, including an electromagnetic drive device according to any one of claims 1 to 12.

[0016] Preferably, the switching device is a contactor or an electrically controlled valve.

[0017] The electromagnetic drive device of the present invention uses two sets of electromagnetic coils to drive and realize the state switching between three workstations with initial position and displacement in two directions opposite to the initial position.

[0018] The first and second coils share a single first moving iron core, making the structure more compact and smaller in size.

[0019] The initial position of the first moving iron core is limited by the limiting device, so that the release of the limiting device and the forward and reverse displacement of the first moving iron core are synchronized, ensuring the limitation of the initial position of the first moving iron core and avoiding possible malfunctions.

[0020] The electromagnetic drive device of this invention is applied in a switching device to achieve switching between three operating positions. This type of switching device can be used for switching between two circuits. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the electromagnetic drive device with the first moving iron core in its initial position.

[0022] Figure 2 This is a schematic diagram of the electromagnetic drive device structure after the first moving iron core has undergone positive displacement.

[0023] Figure 3 This is a schematic diagram of the electromagnetic drive device structure after the first moving iron core has reversed its displacement.

[0024] Figure Labels

[0025] 1. First coil 2. Second coil 3. Limiting coil 4. First moving iron core 5. Central magnetic yoke plate 6. Limiting rod 7. Magnetic yoke plate 8. Second return spring 9. First return spring 10. Coil frame 11. Second stationary iron core 12. First stationary iron core 13. Third return spring 14. Third stationary iron core 15. First U-shaped magnetic yoke 16. Second moving iron core Detailed Implementation

[0026] The electromagnetic drive device of the present invention includes a first electromagnetic drive device and a second electromagnetic drive device. The first electromagnetic drive device and the second electromagnetic drive device share a first moving iron core. In the initial position, the first moving iron core is located adjacent to the first electromagnetic drive device and the second electromagnetic drive device. The first electromagnetic drive device and the second electromagnetic drive device respectively drive the first moving iron core to move in opposite directions.

[0027] The electromagnetic drive device of the present invention can be applied in switching devices, such as relays, contactors, and electrically controlled valves.

[0028] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0029] See Figures 1 to 3 The electromagnetic drive device includes a first electromagnetic drive device and a second electromagnetic drive device. The first electromagnetic drive device drives the first moving iron core 4 to move forward relative to the initial position, and the second electromagnetic drive device drives the first moving iron core 4 to move backward relative to the initial position.

[0030] When the first electromagnetic drive device and the second electromagnetic drive device are energized, they drive the first moving iron core to move in different directions. For example, when the first electromagnetic drive device is energized, it generates a magnetic field that drives the first moving iron core 4 to move in a first direction. The direction and distance of displacement can be set according to specific circumstances. When the first electromagnetic drive device is de-energized, the first moving iron core resets, preferably to its initial position. When the second electromagnetic drive device is energized, it generates a magnetic field that drives the moving iron core to move in a second direction. Preferably, the second direction can be the opposite direction of the first direction. The direction and distance of displacement can be set according to specific circumstances. When the second electromagnetic drive device is de-energized, the first moving iron core 4 resets, preferably to its initial position. The initial position is the break position, preferably located at the midpoint between the first and second directions.

[0031] The first electromagnetic drive device and the second electromagnetic drive device can, when energized simultaneously, adjust the magnitude of the magnetic field between the first electromagnetic drive device and the second electromagnetic drive device. For example, the magnitude of the magnetic field generated can be adjusted by adjusting the magnitude of the current flowing between the first and second electromagnetic drive devices, so as to control and drive the first moving iron core 4 to move in different directions. For example, when the electromagnetic force generated by the first electromagnetic drive device is greater, the first moving iron core 4 moves in the first displacement direction; when the electromagnetic force generated by the second electromagnetic drive device is greater, the first moving iron core 4 moves in the second displacement direction; when the electromagnetic forces generated by the two are the same, the first moving iron core does not move.

[0032] The following example illustrates how the first electromagnetic drive device and the second electromagnetic drive device drive the first moving iron core 4 to move in opposite directions.

[0033] The first electromagnetic drive device includes a first coil 1, a first moving iron core 4, and a first stationary iron core 12; the second electromagnetic drive device includes a second coil 2, a second stationary iron core 11, and a first moving iron core 4; the first electromagnetic drive device and the second electromagnetic drive device share the first moving iron core 4.

[0034] The magnetic yoke plate 7 is mounted on the first U-shaped magnetic yoke 15, which is supported by the housing. The magnetic yoke plate 7 divides the housing into two chambers, with the drive unit and contact system located in different chambers.

[0035] The first coil 1 and the second coil 2 are respectively wound on their respective coil frames 10 and are located between the first U-shaped magnetic yoke 15 and the magnetic yoke plate 7. A central magnetic yoke plate 5 is provided between the first coil 1 and the second coil 2, supporting the first coil 1. The shell also supports the central magnetic yoke plate 5. The first coil 1 and the second coil 2 are stacked, and their hollow portions form a displacement channel. The first moving iron core 4 is disposed in the displacement channel formed by the hollow portions of the first coil 1 and the second coil 2 and can be linearly displaced along the displacement channel. A first stationary iron core 12 and a second stationary iron core 11 are respectively provided at both ends of the displacement channel formed by the first coil 1 and the second coil 2. The first stationary iron core 12 is located in the forward displacement direction of the first moving iron core 4, and the second stationary iron core 11 is located in the reverse displacement direction of the first moving iron core 4. That is, the first stationary iron core 12 is fixedly disposed on the magnetic yoke plate 7, and the second stationary iron core 11 is fixedly disposed on the first U-shaped magnetic yoke 15.

[0036] The first moving iron core 4 is located in the displacement channel between the first stationary iron core 12 and the second stationary iron core 11. A first return spring 9 is provided between the first moving iron core 4 and the first stationary iron core 12, and a second return spring 8 is provided between the first moving iron core 4 and the second stationary iron core 11. The first and second return springs are always in a compressed state. In the initial position, the first moving iron core 4 is located adjacent to the first coil 1 and the second coil 2.

[0037] To ensure that the first moving iron core 4 does not shift in its initial position and does not malfunction, a limiting device is used to limit the initial position of the first moving iron core.

[0038] A limiting device is disposed on one side of the first electromagnetic drive device and the second electromagnetic drive device, specifically on one side of the first coil and the second coil. The limiting device includes a limiting drive mechanism and a retractable limiting rod 6. The limiting drive mechanism includes a limiting coil 3, a second moving iron core 16, a third stationary iron core 14, and a second U-shaped magnetic yoke. The second U-shaped magnetic yoke is fixedly connected to the magnetic yoke plate 7 and the first U-shaped magnetic yoke 15, and the limiting coil 3 is fixedly disposed on the second U-shaped magnetic yoke. The third stationary iron core 14 is fixedly disposed at the end of the limiting coil 3 away from the first coil and the second coil. The second moving iron core 16 passes through the hollow part of the limiting coil 3, and a third return spring 13 is disposed between the second moving iron core 16 and the third stationary iron core 14. The third return spring is always in a compressed state. One end of the limiting rod 6 is fixedly mounted on the second moving iron core 16. Under the elastic force of the third return spring 13, the other end of the limiting rod 6 passes between the coil frames of the first coil 1 and the second coil 2 and abuts against the limiting groove opened on the outer surface of the first moving iron core 4, thus defining the initial position of the first moving iron core 4. When the limiting coil 3 is energized, the third stationary iron core 14 attracts the second moving iron core 16 and moves away from the first moving iron core 4, causing the limiting rod 6 to disengage from the first moving iron core 4 and releasing the limiting position.

[0039] The limiting rod 6 and the central magnetic yoke plate 5 are designed to be on the same plane. The coplanar design of the limiting rod 6 and the central magnetic yoke plate 5 allows for the reuse of the U-shaped magnetic yoke to form two sets of magnetic circuits. At the same time, the structure is simple and easy to assemble.

[0040] Working principle:

[0041] When forward displacement is required, the first coil 1 and the limiting coil 3 are energized simultaneously, while the second coil 2 is de-energized. Under the magnetic attraction of the third stationary iron core 14, the second moving iron core 16, carrying the limiting rod 6, moves away from the first moving iron core 4, causing the limiting rod 6 to disengage from the first moving iron core 4 and releasing the position restriction on the first moving iron core 4. Under the magnetic attraction of the first stationary iron core 12, the first moving iron core 4 moves forward away from the driving device. During the displacement of the first moving iron core 4, the first moving iron core 4 always contacts the limiting rod 6, keeping the limiting rod 6 always outside the displacement channel of the first moving iron core 4.

[0042] When it is necessary to reset to the initial position, the first coil 1 and the limiting coil 3 are simultaneously de-energized. Under the action of the reset spring, the first moving iron core 4 resets to the initial position. When the first moving iron core 4 just moves to the position of the limiting rod 6, the magnetic force acting on the second moving iron core 16 disappears due to the de-energization of the limiting coil 3. Under the elastic force of the reset spring, the limiting rod 6 extends towards the first moving iron core 4 and gets into the limiting groove of the first moving iron core 4, thus limiting the position of the reset first moving iron core 4. If it is necessary for the first moving iron core 4 to continuously move in the positive direction, the energization and de-energization of the first coil 1 and the limiting coil 3 can be repeated.

[0043] When reverse displacement is required, the second coil 2 and the limiting coil 3 are energized simultaneously, and the first coil 1 is de-energized. Under the magnetic attraction of the third stationary iron core 14, the second moving iron core 16 carries the limiting rod 6 and moves away from the first moving iron core 4, so that the limiting rod 6 is separated from the contact with the first moving iron core 4 and the position limitation on the first moving iron core 4 is released.

[0044] Under the magnetic attraction of the second stationary iron core 11, the first moving iron core 4 moves in the opposite direction along the displacement channel toward the drive device. During the displacement of the first moving iron core 4, the first moving iron core 4 is always in contact with the limiting rod 6, so that the limiting rod 6 is always located outside the displacement channel of the first moving iron core 4.

[0045] When it is necessary to reset to the initial position, the second coil 2 and the limit coil 3 are de-energized at the same time. Under the action of the reset spring, the first moving iron core 4 is reset to the initial position. The first moving iron core 4 is just displaced to the position of the limit rod 6. Since the limit coil 3 is de-energized, the magnetic force acting on the second moving iron core 16 disappears. Under the action of the spring force of the reset spring, the limit rod 6 extends towards the first moving iron core 4 and is locked into the limit groove of the first moving iron core 4, thus limiting the position of the first moving iron core 4 that has been reset to the initial position.

[0046] Alternatively, the first coil 1, the second coil 2, and the limiting coil 3 can be energized simultaneously. By energizing the limiting coil 3, the limiting rod 6 can be retracted, thus releasing the position limitation on the first moving iron core 4. By adjusting the magnitude of the current flowing through the first coil 1 and the second coil 2, the magnitude of the magnetic force generated by the first coil 1 and the second coil 2 can be adjusted, which is used to determine the displacement direction and displacement distance of the first moving iron core 4.

[0047] To facilitate the force transmission of the first moving iron core 4, a drive rod (not shown) is fixedly installed on the first moving iron core 4. One end of the drive rod can pass through the first stationary iron core 12 as the drive end. The target driven by the drive rod can be connected to the drive end of the drive rod or located on the displacement path of the drive end. Similarly, one end of the drive rod can also pass through the second stationary iron core 11; alternatively, the drive rod can be fixed to the first moving iron core, with its two ends passing through the first stationary iron core 12 and the second stationary iron core 11 respectively, with the two ends of the drive rod serving as drive ends.

[0048] The aforementioned electromagnetic drive device is used in switching devices, serving as the driving mechanism to drive the switch to open and close. The switching device can be either a contactor or an electrically controlled valve.

Claims

1. An electromagnetic drive device, characterized in that, It includes a first electromagnetic drive device and a second electromagnetic drive device. The first electromagnetic drive device and the second electromagnetic drive device share a first moving iron core. In the initial position, the first moving iron core is located adjacent to the first electromagnetic drive device and the second electromagnetic drive device. A central magnetic yoke plate is provided between the first electromagnetic drive device and the second electromagnetic drive device. The first electromagnetic drive device and the second electromagnetic drive device respectively drive the first moving iron core to move in opposite directions.

2. The electromagnetic drive device according to claim 1, characterized in that, A retractable limiting device is provided on the outside of the first electromagnetic drive device and the second electromagnetic drive device. The limiting device passes between the first electromagnetic drive device and the second electromagnetic drive device to define the initial position of the first moving iron core.

3. The electromagnetic drive device according to claim 2, characterized in that, It includes a magnetic yoke plate and a first U-shaped magnetic yoke, the magnetic yoke plate is mounted on the first U-shaped magnetic yoke, and the first electromagnetic drive device and the second electromagnetic drive device are stacked between the magnetic yoke plate and the first U-shaped magnetic yoke.

4. The electromagnetic drive device according to claim 3, characterized in that, The first electromagnetic drive device includes a first coil, a first stationary iron core, and a first return spring; the second electromagnetic drive device includes a second coil, a second stationary iron core, and a second return spring; the first coil and the second coil are arranged adjacent to each other and their hollow portions are connected to form a displacement channel, and the first moving iron core is located in the displacement channel; the first stationary iron core and the second stationary iron core are respectively located at opposite ends of the first coil and the second coil; the first return spring is arranged between the first moving iron core and the first stationary iron core, and the second return spring is arranged between the first moving iron core and the second stationary iron core; the central magnetic yoke is arranged between the first coil and the second coil.

5. The electromagnetic drive device according to claim 4, characterized in that, The limiting device includes a retractable limiting rod and a limiting drive mechanism for driving the limiting rod to extend or retract. The limiting rod passes between the first electromagnetic drive device and the second electromagnetic drive device to define the initial position of the first moving iron core.

6. The electromagnetic drive device according to claim 5, characterized in that, The limiting drive mechanism includes a limiting coil, a second moving iron core, a third stationary iron core, and a third return spring. The limiting coil is located outside the first electromagnetic drive device and the second electromagnetic drive device. The third stationary iron core is located at the end of the limiting coil away from the first moving iron core. The third return spring is disposed between the second moving iron core and the third stationary iron core. One end of the limiting rod is fixedly disposed on the second moving iron core, and the other end passes through the space between the first electromagnetic drive device and the second electromagnetic drive device and abuts against the outer surface of the first moving iron core to limit the initial position of the first moving iron core.

7. The electromagnetic drive device according to claim 6, characterized in that, A second U-shaped magnetic yoke is also provided on the outside of the magnetic yoke plate and the first U-shaped magnetic yoke. The second U-shaped magnetic yoke is connected to the magnetic yoke plate and the first U-shaped magnetic yoke respectively. A limiting coil is provided between the second U-shaped magnetic yoke and the coil frame of the first coil and the second coil.

8. The electromagnetic drive device according to claim 7, characterized in that, A limiting groove is provided on the outer surface of the first moving iron core, and one end of the limiting rod abuts in the limiting groove.

9. The electromagnetic drive device according to claim 8, characterized in that, The two ends of the first moving iron core are respectively located in the hollow parts of the first coil and the second coil. When the first moving iron core is displaced, the first moving iron core abuts against the limiting rod, so that the limiting rod is located outside the displacement channel.

10. The electromagnetic drive device according to claim 5, characterized in that, The limiting rod and the central magnetic yoke plate are designed to be on the same plane.

11. The electromagnetic drive device according to claim 1, characterized in that, A drive rod is provided on the first moving iron core, and the drive rod passes through the first stationary iron core and / or the second stationary iron core.

12. A switching device, characterized in that, Includes the electromagnetic drive device according to any one of claims 1 to 11.

13. The switching device according to claim 12, characterized in that, The switching device is a contactor or an electrically controlled valve.

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