CN111146041A

CN111146041A - Driving mechanism of vacuum switch

Info

Publication number: CN111146041A
Application number: CN201911399731.7A
Authority: CN
Inventors: 王明
Original assignee: ANHUI YUTENG VACUUM ELECTRICAL CO LTD
Current assignee: ANHUI YUTENG VACUUM ELECTRICAL CO LTD
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-05-12

Abstract

The invention discloses a driving mechanism of a vacuum switch, which comprises a first pure iron plate; a second pure iron plate; a base plate; a first support; a second support; the opening coil is fixed on the lower surface of the first pure iron plate; the closing coil is fixed on the upper surface of the second pure iron plate; the eddy current disc is arranged between the opening coil and the closing coil; the upper end of the transmission shaft extends out of the upper surface of the first pure iron plate; the fixed seat is fixed on the lower surface of the second pure iron plate; the guide section is sleeved in the guide hole; the limiting groove is arranged on the guide section and extends along the circumferential direction of the guide section; the first elastic piece is arranged in the mounting hole; the limiting ball is arranged in the mounting hole and is positioned between the first elastic piece and the guide section; the lower end of the mounting piece is fixed with the upper surface of the bottom plate, and the upper end of the mounting piece extends upwards; the limiting piece is arranged on the mounting piece; the second elastic piece is arranged between the end face of the lower end of the transmission shaft and the limiting piece. The vacuum switch is driven to be switched on and off quickly and in short time, and the switching-on and switching-off reliability of the vacuum switch can be ensured.

Description

Driving mechanism of vacuum switch

Technical Field

The invention relates to switch driving equipment in a flexible direct-current extra-high voltage converter valve control power transmission system, in particular to a driving mechanism of a vacuum switch.

Background

The flexible direct current extra-high voltage converter valve control is a solid-state switch formed by power electronic devices, and the direct current has no zero crossing, so the existing alternating current vacuum circuit breaker can not be applied for switching on and switching off. At present, in a flexible direct-current extra-high voltage converter valve power transmission system, an improved vacuum switch is adopted, a magnetic driving mechanism is usually adopted for driving the vacuum switch to be switched on or switched off, the magnetic driving mechanism comprises a switching-off coil, a switching-on coil, an eddy current disc and a connecting rod, and a pulse magnetic field generated by the switching-off coil and the switching-on coil pushes the eddy current disc to move up and down to drive a contact to be switched on and off so as to complete switching-on and switching-off actions. According to the requirement, in order to keep the solid-state switch in the opening or closing state, the magnetic mechanism is adopted for keeping, the excitation time is long, the response speed is low when the opening or closing state is converted, the magnetic mechanism needs a permanent magnet, and the product cost is high.

Therefore, how to shorten the response time of the solid-state switch and reduce the product cost becomes an urgent technical problem to be solved.

Disclosure of Invention

The invention aims to provide a driving mechanism of a vacuum switch, which has high speed and short time for driving the opening and closing of the vacuum switch and can ensure the reliability of the opening and closing of the vacuum switch.

The technical scheme of the invention for realizing the purpose is as follows:

a drive mechanism for a vacuum switch, comprising:

a first pure iron plate;

a second pure iron plate;

a base plate;

the upper end of the first support is fixed with the lower surface of the first pure iron plate, and the lower end of the first support is fixed with the upper surface of the second pure iron plate;

the upper end of the second support is fixed with the lower surface of the second pure iron plate, and the lower end of the second support is fixed with the upper surface of the bottom plate;

the opening coil is fixed on the lower surface of the first pure iron plate;

a closing coil fixed to an upper surface of the second pure iron plate;

the eddy current disc is arranged between the opening coil and the closing coil and can move towards the opening coil or the closing coil;

the upper end of the transmission shaft sequentially penetrates through the second pure iron plate, the closing coil, the vortex disc, the opening coil and the first pure iron plate upwards and extends out of the upper surface of the first pure iron plate, the lower end of the transmission shaft is positioned between the second pure iron plate and the base, and the transmission shaft is fixed with the vortex disc, movably matched with the first pure iron plate, the opening coil, the closing coil and the second pure iron plate and can reciprocate up and down along the axis of the transmission shaft;

the fixing seat is fixed on the lower surface of the second pure iron plate and comprises a guide hole penetrating along the upper and lower directions of the fixing seat and a mounting hole which is arranged on the side surface of the fixing seat, extends towards the direction of the inner wall of the guide hole and penetrates through the inner wall of the guide hole;

the guide section is formed by a part of the transmission shaft, which is positioned between the lower surface of the second pure iron plate and the end surface of the lower end of the transmission shaft, is sleeved in the guide hole and can reciprocate up and down along the guide hole;

the limiting groove is arranged on the guide section and extends along the circumferential direction of the guide section;

the first elastic piece is arranged in the mounting hole;

the limiting ball is arranged in the mounting hole and is positioned between the first elastic piece and the guide section;

the lower end of the mounting piece is fixed with the upper surface of the bottom plate, and the upper end of the mounting piece extends upwards and points to the end surface of the lower end of the transmission shaft;

a limiting member arranged on the mounting member;

and the second elastic piece is arranged between the lower end face of the transmission shaft and the limiting piece.

The distance between the closing coil and the opening coil is larger than the stroke of the vortex disc.

The opening coil, the vortex disc and the closing coil are all circular, and the circle centers of the opening coil, the vortex disc and the closing coil are collinear.

The clearance distance between the vortex disc and the closing coil is 1mm, and the clearance distance between the vortex disc and the opening coil is 1 mm.

The transmission shaft is sleeved in the first guide sleeve and is in sliding fit with the first guide sleeve, and the first guide sleeve is fixedly connected with the inner ring of the opening coil and the first pure iron plate; the transmission shaft is sleeved in the second guide sleeve and is in sliding fit with the second guide sleeve, and the second guide sleeve is fixedly connected with the inner ring of the closing coil and the second pure iron plate.

The first elastic part is a pressure spring, and the second elastic part is a top spring sleeved outside the mounting part.

The guide section is provided with a boss at the periphery of the end facing the base.

The mounting piece is provided with an external thread, the limiting piece is provided with a through hole, the inner wall of the through hole is provided with an internal thread, and the mounting piece and the limiting piece are screwed together; or the mounting part and the limiting part are integrally manufactured, and the lower end of the mounting part is screwed with the nut fixed on the upper surface of the bottom plate.

The adjusting piece is screwed with the mounting hole from the hole opening of the mounting hole on the side surface of the fixed seat.

The invention has the beneficial effects that:

when the invention is applied to a vacuum switch in a flexible direct-current extra-high voltage power transmission system, the upper end of the transmission shaft is connected with the moving contact of the vacuum switch. According to the invention, a magnetic field is generated by electrifying the breaking/closing coil, repulsion force is generated between the breaking/closing coil and the vortex disc, the transmission shaft is driven to move up and down, the moving contact in the vacuum switch is driven to move upwards to be contacted with the fixed contact to realize closing, or the moving contact in the vacuum switch is driven to move downwards to be separated from the fixed contact to realize breaking, so that breaking and closing of the vacuum switch are realized. The vertical moving direction of the transmission shaft and the moving direction of the moving contact are coaxial without a crank arm lever, the mechanical transfer function of a driving system is simple and stable, and the dispersion degree of the action time is less than plus or minus 0.2ms, so that the invention is suitable for accurate control. The external energy storage capacitor is adopted to discharge to the closing and opening coil, the driving force intensity is in direct proportion to the energy storage of the capacitor, the capacitor energy storage mode can output larger current to enable the circuit breaker to complete closing and opening within 2ms, the moving contact and the static contact are closed and opened quickly, the movement inertia is small, the closing and opening efficiency is high, the closing and opening time is reduced, the control precision is high, the pre-breakdown time is short, the electric arc existence time is short, the on-state loss of the switch is small, the heating value is small, the electric abrasion on the surfaces of the moving contact and the static contact is small, and the service life is prolonged.

When the switch is switched off, the self-locking mechanism consisting of the fixed seat, the guide section, the limiting groove, the first elastic element, the limiting ball, the mounting element, the limiting element and the second elastic element locks the transmission shaft, so that the switch-off state of the switch can be reliably maintained. The self-locking mechanism has simple structure and reliable and stable performance, and flexibly applies the mechanical principle to achieve the functions of opening self-locking and closing keeping. And the traditional magnetic force holding is replaced, the excitation time is shortened, the opening and closing response speed is accelerated, and the permanent magnet cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of a connection structure of the opening coil, the closing coil, the vortex plate and the transmission shaft.

Fig. 3 is a schematic view of a connection structure among the fixing seat, the guide section, the limiting groove, the limiting ball, the mounting member and the second elastic member of the present invention.

Fig. 4 is an enlarged view of fig. 1A.

Fig. 5 is a schematic structural view of the fixing base of the present invention.

Detailed Description

The following examples are given to illustrate the present invention and it is necessary to point out here that the following examples are given only for the purpose of further illustration of the invention and are not to be construed as limiting the scope of the invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The description relating to "first", "second", etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Fig. 1-2 illustrate an embodiment of a drive mechanism for a vacuum switch among many embodiments of the present invention. The driving mechanism of the vacuum switch comprises a first pure iron plate 1, a second pure iron plate 2, a bottom plate 3, a first support column 4, a second support column 5, a brake separating coil 6, a brake closing coil 7, an eddy current disc 8, a transmission shaft 9, a fixed seat 10, a first elastic part 11, a guide section 91, a limiting groove 92, a limiting ball 12, a mounting part 13, a limiting part 14 and a second elastic part 15.

In the embodiment shown in fig. 1, the first pure iron plate 1, the second pure iron plate 2, and the bottom plate 3 are all flat plate structures. It is understood that the first pure iron plate 1, the second pure iron plate 2, and the bottom plate 3 are not limited to the flat plate structure, but may be other structures as long as the functions thereof in the present invention can be achieved.

The upper end of the first pillar 4 is fixed to the lower surface of the first pure iron plate 1, and the lower end thereof is fixed to the upper surface of the second pure iron plate 2, for example, but not limited to, welding. The upper end of the second pillar 5 is fixed to the lower surface of the second pure iron plate 2, and the lower end thereof is fixed to the upper surface of the bottom plate 3, for example, but not limited to, welding. Alternatively, the first pure iron plate 1, the second pure iron plate 2, the bottom plate 3, the first support 4 and the second support 5 are integrally formed.

In the embodiment shown in fig. 1, the number of the first support 4 and the second support 5 is 4, and the first support and the second support are respectively distributed in a quadrilateral shape. It is understood that the number of the first and

second pillars

4 and 5 is not a specific value, but may be other numbers according to actual needs. When the invention is arranged in the manner presented in fig. 1, both the first 4 and the second 5 support columns are supporting.

Referring also to fig. 2, the opening coil 6 is fixed to the lower surface of the first pure iron plate 1. The closing coil 7 is fixed to the upper surface of the second pure iron plate 2. The vortex disc 8 is arranged between the opening coil 6 and the closing coil 7 and can move towards the opening coil 6 or the closing coil 7. The upper end of the transmission shaft 9 sequentially penetrates through the second pure iron plate 2, the closing coil 7, the vortex disc 8, the opening coil 6 and the first pure iron plate 1 upwards and extends out of the first pure iron plate 1, the lower end of the transmission shaft is located between the second pure iron plate 2 and the base 5 and fixed with the vortex disc 8, and the transmission shaft is movably matched with the first pure iron plate 1, the opening coil 6, the closing coil 7 and the second pure iron plate 2 and can reciprocate up and down along the axis of the transmission shaft. Preferably, the upper end of the transmission shaft 9 is connected with a connecting seat 20, and the connecting seat 20 is used for being connected with a moving contact of the vacuum switch. The outer diameter of the connecting socket 20 is larger than the inner diameter of a through hole provided in the first pure iron plate 1 for the transmission shaft 9 to pass through, so as to prevent the downward movement of the transmission shaft 9 from exceeding the allowable range. The transmission shaft 9 may be a cylindrical stepped shaft.

The opening coil 6 includes a first coil bobbin 61 and a first enameled wire 62 disposed on the first coil bobbin 61. The closing coil 7 includes a second coil bobbin 71 and a second enameled wire 72 disposed on the second coil bobbin 71.

Referring to fig. 3 to 5, the fixing base 10 is fixed to the lower surface of the second pure iron plate 2, and includes a guiding hole 101 penetrating along the vertical direction thereof, and a mounting hole 102 provided at the side thereof to extend toward the inner wall of the guiding hole 101 and penetrating through the inner wall of the guiding hole 101. The guide hole 101 guides the vertical movement of the transmission shaft 9, and prevents the lower end from swinging sideways when the transmission shaft 9 moves vertically.

The guide section 91 is formed by a part of the transmission shaft 9 between the lower surface of the second pure iron plate 2 and the lower end face of the transmission shaft 9, is sleeved in the guide hole 101, and can reciprocate up and down along the guide hole 101.

The limit groove 92 is provided in the guide section 91, and extends circumferentially along the guide section 91. The stop groove 92 preferably extends circumferentially along the guide section 91 in end-to-end communication.

The first elastic member 11 is disposed in the mounting hole 102.

The limiting ball 12 is a spherical structure, and is disposed in the mounting hole 102 and located between the first elastic member 11 and the guiding section 91. The stop ball 12 may be, but is not limited to, a steel ball.

The lower end of the mounting piece 13 is fixed with the upper surface of the bottom plate 3, and the upper end thereof extends upwards and points to the lower end surface of the transmission shaft 9. The mount 13 also prevents the downward movement of the drive shaft 9 beyond the allowable range.

The stopper 14 is provided to the mounting member 13.

The second elastic element 15 is disposed between the lower end surface of the transmission shaft 9 and the limiting element 14, and the limiting element 14 limits the downward movement of the second elastic element 15.

The up-down moving track of the transmission shaft 9 is better overlapped with the axis thereof, so as to reliably ensure that the up-down moving direction of the transmission shaft 9 is coaxial with the moving direction of the moving contact of the vacuum switch without a crank lever.

In some embodiments, the spacing between the closing coil 7 and the opening coil 6 is greater than the stroke of the vortex disk 8.

In some embodiments, the opening coil 6, the vortex disc 8 and the closing coil 7 are all circular, and the centers of the circles are collinear.

In some embodiments, the gap distance between the vortex disc 8 and the closing coil 7 is 1mm, and the gap distance between the vortex disc 8 and the opening coil 6 is 1 mm.

In some embodiments, the present invention further includes a first guide sleeve 27 sleeved in the inner ring of the opening coil 6 and penetrating through the first pure iron plate 1, the transmission shaft 9 is sleeved in the first guide sleeve 27 and is in sliding fit with the first guide sleeve 27, and the first guide sleeve 27 is fixedly connected with the inner ring of the opening coil 6 and the first pure iron plate 1, so as to facilitate the flexible movement of the transmission shaft 9 in the first guide sleeve 27 and prevent the transmission shaft 9 from swinging to the side when moving up and down. The device is characterized by further comprising a second guide sleeve 28 sleeved in the inner ring of the closing coil 7 and penetrating through the second pure iron plate 2, a transmission shaft 9 is sleeved in the second guide sleeve 28 and is in sliding fit with the second guide sleeve 28, and the second guide sleeve 28 is fixedly connected with the inner ring of the closing coil 7 and the second pure iron plate 2 so as to facilitate flexible movement of the transmission shaft 9 in the second guide sleeve 28 and prevent the transmission shaft 9 from swinging to the side when moving up and down.

In some embodiments, the first elastic member 11 is a compression spring, and the second elastic member 15 is a top spring sleeved outside the mounting member 13.

In some embodiments, the guide section 91 has a boss 93 at the outer periphery of the end facing the base 5, and the boss 93 limits the upward travel of the transmission shaft 9 so as to prevent the second elastic member 15 from being located too far upward and damaging the movable contact and/or the fixed contact of the vacuum switch.

In some embodiments, the mounting member 13 is integrally formed with the limiting member 14, the lower end of the mounting member 13 is screwed with the nut 18 fixed on the upper surface of the base plate 3, the mounting member 13 can be rotated to conveniently adjust the torque of the second elastic member 15, and the mounting member 13 can be adjusted to adjust the height of the upper end surface of the mounting member 13 relative to the upper surface of the base plate 3, and can also serve to limit the downward movement stroke of the transmission shaft 9. Or, the mounting part 13 has an external thread, the limiting part 14 has a through hole, the inner wall of the through hole has an internal thread, the mounting part 13 is screwed with the limiting part 14, and the limiting part 14 is rotated, so that the torque of the second elastic part 15 can be conveniently adjusted.

In some embodiments, the invention further includes an adjusting member 19, the adjusting member 19 is screwed with the mounting hole 102 from the opening of the mounting hole 102 on the side of the fixed seat 10, and the rotation of the adjusting member 19 can adjust the magnitude of the moment of the first elastic member 11, thereby adjusting the pressure of the limiting ball 12 on the limiting groove 92, and further adjusting the magnitude of the self-locking force.

When the invention is applied to a vacuum switch in a flexible direct-current extra-high voltage power transmission system, the upper end of the transmission shaft 9 is connected with a moving contact of the vacuum switch. When the brake is switched off, the switching-off coil 6 generates a magnetic field under the drive of an external energy storage capacitor, repulsion force is generated between the switching-off coil 6 and the vortex disc 8, the vortex disc 8 is driven to move downwards, the vortex disc 8 applies downward acting force to the transmission shaft 9, the acting force overcomes the upward jacking force applied to the transmission shaft 9 by the second elastic part 15, so that the transmission shaft 9 is driven to move downwards, the transmission shaft 9 drives the moving contact to move downwards, and the moving contact is separated from the static contact of the vacuum switch to realize the switching-off. The limiting ball 12 is pressed on the side surface of the transmission shaft 9 under the elastic force of the first elastic piece 11, the limiting ball 12 and the side surface of the transmission shaft 9 jointly form a rolling pair, and in the process that the transmission shaft 9 is driven by the vortex disc 8 to move downwards, the transmission shaft 9 moves downwards to drive the limiting ball 12 to rotate in the mounting hole 102 under the action of friction force. With the continuous downward movement of the transmission shaft 9, the limiting groove 92 and the hole opening of the mounting hole 102 on the inner wall of the guide hole 101 are gradually aligned in opposite directions, in the process, the limiting ball 12 gradually moves from the side wall of the transmission shaft 9 to the limiting groove 52 under the elastic force of the first elastic piece 11 until the limiting ball 12 enters the limiting groove 92 and cannot move to the bottom surface of the limiting groove 92, at the moment, the limiting ball 12 is partially located in the limiting groove 92, the rest of the limiting ball 12 is located in the mounting hole 102, the limiting ball 12, the limiting groove 92 and the mounting hole 102 are mutually matched to lock the transmission shaft 9 and cannot freely move up and down, the vacuum switch is guaranteed to be reliably kept in a brake-separating state, and the brake-separating self-locking function of the vacuum switch.

When the vacuum switch is switched on, the switching-on coil 7 generates a magnetic field under the drive of an external energy storage capacitor, repulsion force is generated between the switching-on coil 7 and the vortex disc 8 to drive the vortex disc 8 to move upwards, the vortex disc 8 applies upward acting force to the transmission shaft 9, the second elastic element 15 applies upward jacking force to the transmission shaft 9, the transmission shaft 9 moves upwards, the transmission shaft 9 drives the moving contact to move upwards, and the moving contact is contacted with the fixed contact of the vacuum switch to realize switching-on. When the transmission shaft 9 starts to move upwards, the limiting ball 12 is subjected to the acting force of the side wall opening edge of the limiting groove 92, one force component of the acting force is directed to the first elastic part 11, the force component overcomes the acting force of the first elastic part 11 on the limiting ball 12, the limiting ball 12 is pushed to move towards the direction far away from the transmission shaft 9 along the mounting hole 102, along with the continuous upward movement of the transmission shaft 9, the limiting ball 12 gradually moves towards the direction far away from the transmission shaft 9 along the mounting hole 102, the first elastic part 11 is gradually compressed until the limiting ball 12 completely breaks away from the limiting groove 92, and self-locking is released. The transmission shaft 9 continues to move upwards again, the limiting ball 12 is pressed on the side face of the transmission shaft 9 under the elastic action of the first elastic piece 11, the limiting ball 12 and the side face of the transmission shaft 9 jointly form a rolling pair, the vortex disc 8 drives the transmission shaft 9 to move upwards, in the process of driving the transmission shaft 9 to move upwards, the transmission shaft 9 moves upwards to drive the limiting ball 12 to rotate in the mounting hole 102 under the action of friction force, and after the transmission shaft 9 moves upwards to a certain position, the second elastic piece 15 extends upwards to prop against the transmission shaft 9, so that the vacuum switch is guaranteed to be reliably kept in a switch-on state, and the function of keeping the switch. The second elastic member 15 may also serve as a buffer when the transmission shaft 9 moves downward.

It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in any further detail in order to avoid unnecessary repetition.

The present invention has been described in detail with reference to the embodiments, which are illustrative rather than restrictive, and variations and modifications thereof are possible within the scope of the present invention without departing from the general inventive concept.

Claims

1. A drive mechanism for a vacuum switch for use in a flexible DC ultra high voltage power transmission system, comprising:

a first pure iron plate (1);

a second pure iron plate (2);

a base plate (3);

the upper end of the first support column (4) is fixed with the lower surface of the first pure iron plate (1), and the lower end of the first support column is fixed with the upper surface of the second pure iron plate (2);

the upper end of the second support column (5) is fixed with the lower surface of the second pure iron plate (2), and the lower end of the second support column is fixed with the upper surface of the bottom plate (3);

a switching-off coil (6) fixed to the lower surface of the first pure iron plate (1);

a closing coil (7) fixed to the upper surface of the second pure iron plate (2);

the vortex disc (8) is arranged between the opening coil (6) and the closing coil (7) and can move towards the opening coil (6) or the closing coil (7);

the upper end of the transmission shaft (9) sequentially penetrates through the second pure iron plate (2), the closing coil (7), the vortex disc (8), the opening coil (6) and the first pure iron plate (1) upwards and extends out of the upper surface of the first pure iron plate (1), the lower end of the transmission shaft is positioned between the second pure iron plate (2) and the base, the transmission shaft is fixed with the vortex disc (8), and the transmission shaft is movably matched with the first pure iron plate (1), the opening coil (6), the closing coil (7) and the second pure iron plate (2) and can reciprocate up and down along the axis of the transmission shaft;

the fixing seat (10) is fixed on the lower surface of the second pure iron plate (2) and comprises a guide hole (101) which penetrates through the fixing seat along the vertical direction and a mounting hole (102) which is arranged on the side surface of the fixing seat, extends towards the inner wall direction of the guide hole (101) and penetrates through the inner wall of the guide hole (101);

the guide section (91) is formed by a part of the transmission shaft (9) between the lower surface of the second pure iron plate (2) and the end surface of the lower end of the transmission shaft (9), is sleeved in the guide hole (101) and can move up and down along the guide hole (101) in a reciprocating manner;

a limit groove (92) provided in the guide section (91) and extending circumferentially along the guide section (91);

a first elastic member (11) disposed in the mounting hole (102);

the limiting ball (12) is arranged in the mounting hole (102) and is positioned between the first elastic piece (11) and the guide section (91);

the lower end of the mounting piece (13) is fixed with the upper surface of the bottom plate (3), and the upper end of the mounting piece extends upwards and points to the end surface of the lower end of the transmission shaft (9);

a stopper (14) provided to the mounting member (13);

and the second elastic piece (15) is arranged between the lower end face of the transmission shaft (9) and the limiting piece (14).

2. The drive mechanism according to claim 1, characterized in that the spacing between the closing coil (7) and the opening coil (6) is greater than the stroke of the vortex disk (8).

3. The drive mechanism according to claim 1, characterized in that the opening coil (6), the vortex disc (8) and the closing coil (7) are all circular with collinear centers.

4. The drive mechanism according to claim 1, characterized in that the clearance distance between the vortex disc (8) and the closing coil (7) is 1mm, and the clearance distance between the vortex disc (8) and the opening coil (6) is 1 mm.

5. The driving mechanism is characterized by further comprising a first guide sleeve (16) sleeved in the inner ring of the opening coil (6) and penetrating through the first pure iron plate (1), wherein the transmission shaft (9) is sleeved in the first guide sleeve (16) and is in sliding fit with the first guide sleeve (16), and the first guide sleeve (16) is fixedly connected with the inner ring of the opening coil (6) and the first pure iron plate (1); the device is characterized by further comprising a second guide sleeve (17) sleeved in the inner ring of the closing coil (7) and penetrating through the second pure iron plate (2), a transmission shaft (9) is sleeved in the second guide sleeve (17) and is in sliding fit with the second guide sleeve (17), and the second guide sleeve (17) is fixedly connected with the inner ring of the closing coil (7) and the second pure iron plate (2).

6. The drive mechanism according to claim 1, wherein the first elastic member (11) is a compression spring, and the second elastic member (15) is a top spring fitted to the mounting member (13).

7. The drive mechanism as recited in claim 1, characterized in that the guide section (91) has a projection (93) on the periphery of its end facing the base.

8. The drive mechanism according to claim 1, wherein the mounting member (13) has an external thread, the limiting member (14) has a through hole, an inner wall of the through hole has an internal thread, and the mounting member (13) is screwed with the limiting member (14); or the mounting piece (13) and the limiting piece (14) are integrally manufactured, and the lower end of the mounting piece (13) is screwed with a nut (18) fixed on the upper surface of the bottom plate (3).

9. The driving mechanism according to claim 1, wherein the upper end of the transmission shaft (9) is connected with a connecting seat (20), and the outer diameter of the connecting seat (20) is larger than the inner diameter of a through hole provided in the first pure iron plate (1) for the transmission shaft (9) to pass through.

10. The drive mechanism according to any one of claims 1 to 9, further comprising an adjusting member (19), wherein the adjusting member (19) is screwed with the mounting hole (102) from an opening of the mounting hole (102) located at the side of the fixed seat (10).