阅读说明：本技术 一种双向自锁电磁开关 (Bidirectional self-locking electromagnetic switch ) 是由 向宝才 于 2020-12-05 设计创作，主要内容包括：本发明公开了一种双向自锁电磁开关,包括定子外壳、两极转子铁芯、转子线圈、左滑动片、滑动触点、第一整流二极管、第二整流二极管、右滑动片、滑动触点套、转子轴、右定位销、弹簧、左定位销和定子磁极。本发明的工作线圈属于点动式,通电触发时间即短,在零点几秒之内,完成一个周期不到1秒钟。与现有继电器和交流接触器相比,电磁线圈不发热,十分节能。和继电器和交流接触器相比,本发明属于静态无功耗工作,所以,没有电磁场和辐射。(The invention discloses a bidirectional self-locking electromagnetic switch which comprises a stator shell, a two-pole rotor core, a rotor coil, a left sliding sheet, a sliding contact, a first rectifier diode, a second rectifier diode, a right sliding sheet, a sliding contact sleeve, a rotor shaft, a right positioning pin, a spring, a left positioning pin and a stator magnetic pole. The working coil of the invention belongs to a point-moving type, the energizing triggering time is short, and within a few tenths of a second, one cycle can be completed within less than 1 second. Compared with the existing relay and AC contactor, the electromagnetic coil does not generate heat, so that the energy is saved. Compared with relay and AC contactor, the present invention is static and has no power consumption, so that it has no electromagnetic field and radiation.)

1. A bidirectional self-locking electromagnetic switch is characterized by comprising a stator shell (1), a two-pole rotor core (2), a rotor coil (3), a left sliding sheet (4), a sliding contact (5), a first rectifying diode (6), a second rectifying diode (7), a right sliding sheet (8), a sliding contact sleeve (9), a rotor shaft (10), a right positioning pin (11), a spring (12), a left positioning pin (13) and a stator magnetic pole (14);

the two-pole rotor iron core (2) is fixedly arranged inside the stator shell (1); the rotor coils (3) are uniformly wound on the outer surface of the two-pole rotor iron core (2); one end of the rotor coil (3) serves as a leading-out wiring terminal B, and the other end of the rotor coil is connected with the anode of the first rectifier diode (6) and the cathode of the second rectifier diode (7) through leads respectively; the cathode of the first rectifier diode (6) and the anode of the second rectifier diode (7) are respectively connected with the left sliding sheet (4) and the right sliding sheet (8) in a one-to-one correspondence manner; one end of the sliding contact (5) is movably connected with a plane formed by the left sliding sheet (4) and the right sliding sheet (8), and the other end of the sliding contact is fixedly connected with the rotor shaft (10) through a sliding contact sleeve (9); the leading-out wiring terminal A is led out from the sliding contact (5); the right positioning pin (11) and the left positioning pin (13) are respectively and fixedly arranged at two ends of the rotor shaft (10); the rotor shaft (10) is fixedly connected with the ground through a spring (12); the stator magnetic pole (14) is fixedly arranged on the inner wall of the stator shell (1).

2. The bidirectional self-locking electromagnetic switch according to claim 1, further comprising a left stationary contact (15), a movable contact (16), a right stationary contact (17), and an insulating sleeve (18);

the moving contact (16) is fixedly arranged outside the rotor shaft (10); the insulating sleeve (18) is fixedly arranged on the outer surface of the movable contact (16); the left fixed contact (15) and the right fixed contact (17) are respectively and fixedly arranged at two ends of the movable contact (16);

the insulating sleeve (18) is used for fixing the moving contact (16) and insulating the fixed moving contact (16) from the rotor shaft (10).

3. The electromagnetic switch according to claim 1, characterized in that the stator housing (1) and the stator poles (14) form a stator structure of a direct current motor.

4. The bidirectional self-locking electromagnetic switch according to claim 1, wherein the two-pole rotor core (2), the rotor coil (3) and the rotor shaft (10) form a rotor structure capable of rotating left and right in a half cycle.

5. The electromagnetic switch of claim 1, wherein the left slider (4), the sliding contact (5), the first rectifying diode (6), the second rectifying diode (7), the right slider (8), the sliding contact sleeve (9) and the rotor shaft (10) form an automatic power-off switching structure.

6. The electromagnetic switch of claim 1, wherein the rotor shaft (10), the right positioning pin (11), the spring (12) and the left positioning pin (13) form a mechanical bidirectional self-locking structure.

7. A bi-directional self-locking electromagnetic switch according to claim 2, characterized in that the rotor shaft (10), the left stationary contact (15), the movable contact (16), the right stationary contact (17) and the insulating sleeve (18) constitute a main control contact structure.

8. A bi-directional self-locking electromagnetic switch according to claim 1, characterized in that the stator poles (14) comprise an S pole permanent magnet and an N pole permanent magnet.

9. The bi-directional self-locking electromagnetic switch according to claim 7, further comprising a bearing seat (20) and an integral base (21);

the stator comprises a stator shell (1), a two-pole rotor core (2), a rotor coil (3), a left sliding sheet (4), a sliding contact (5), a first rectifying diode (6), a second rectifying diode (7), a right sliding sheet (8), a sliding contact sleeve (9), a rotor shaft (10), a right positioning pin (11), a spring (12), a left positioning pin (13) and a stator magnetic pole (14) which are combined to form a power assembly system (19); the power assembly system (19) drives the movable contact (16) and the insulating sleeve (18) to work through the rotor shaft (10); the bearing seat (20) is fixedly connected with the movable contact (16); the movable contact (16), the insulating sleeve (18), the power assembly system (19) and the bearing seat (20) are all fixedly arranged on the integral machine base (21).

Technical Field

The invention belongs to the technical field of electromagnetic switches, and particularly relates to a bidirectional self-locking electromagnetic switch.

Background

The existing relay and the existing alternating current contactor are limited by linear electromagnetic force, so that the gap between a movable contact and a fixed contact cannot be made to be too large, and the gap between the movable contact and the fixed contact of the general relay is about 1-2 mm. Present relay or ac contactor, most burn out because the coil generates heat the temperature height, especially work in summer or high temperature environment very outstandingly, practice learns, and general ac contactor is as long as continuous operation half an hour, and the finger machine is originally dare not to touch the coil iron core, because the temperature is high scalds the hand. The high temperature can also accelerate the aging of the insulating layer, the magnetic conductivity of the iron core is reduced, and the service life of the product is shortened.

Disclosure of Invention

The invention aims to solve the problems of selection and poor performance of a relay and an alternating current contactor, and provides a bidirectional self-locking electromagnetic switch.

The technical scheme of the invention is as follows: a bidirectional self-locking electromagnetic switch comprises a stator shell, a two-pole rotor core, a rotor coil, a left sliding sheet, a sliding contact, a first rectifier diode, a second rectifier diode, a right sliding sheet, a sliding contact sleeve, a rotor shaft, a right positioning pin, a spring, a left positioning pin and a stator magnetic pole;

the two-pole rotor iron core is fixedly arranged in the stator shell; the rotor coils are uniformly wound on the outer surfaces of the two-pole rotor cores; one end of the rotor coil is used as a leading-out wiring terminal B, and the other end of the rotor coil is respectively connected with the anode of the first rectifying diode and the cathode of the second rectifying diode through leads; the cathode of the first rectifying diode and the anode of the second rectifying diode are respectively connected with the left sliding sheet and the right sliding sheet in a one-to-one correspondence manner; one end of the sliding contact is movably connected with a plane formed by the left sliding sheet and the right sliding sheet, and the other end of the sliding contact is fixedly connected with the rotor shaft through a sliding contact sleeve; the leading-out wiring terminal A is led out from the sliding contact; the right positioning pin and the left positioning pin are respectively and fixedly arranged at two ends of the rotor shaft; the rotor shaft is fixedly connected with the ground through a spring; the stator magnetic pole is fixedly arranged on the inner wall of the stator shell.

The invention has the beneficial effects that:

(1) energy conservation: the working coil of the invention belongs to a point-moving type, the energizing triggering time is short, and within a few tenths of a second, one cycle can be completed within less than 1 second. Compared with the existing relay and AC contactor, the electromagnetic coil does not generate heat, so that the energy is saved.

(2) No electromagnetic interference exists: compared with relay and AC contactor, the present invention is static and has no power consumption, so that it has no electromagnetic field and radiation.

(3) Saving materials: the electromagnetic coil of the invention belongs to the trigger inching work, does not need a large coil to meet the impedance, and compared with the prior relay or AC contactor, the number of the coil can be reduced by more than half, and simultaneously, the volume and the weight are also greatly reduced.

(4) Wide voltage control: the coil of the invention adopts a inching working mode, and the difference of coil current passing at one moment is one to two times, which belongs to a safety range, so that the voltage grade does not need to be various. The present invention can simplify these voltage levels, such as: the working voltage is 3-9V, 12-36V, 110-380V and the like.

(5) The control voltage is higher: the existing relay and the existing alternating current contactor are limited by linear electromagnetic force, so that the gap between a movable contact and a fixed contact cannot be made to be too large, and the gap between the movable contact and the fixed contact of the general relay is about 1-2 mm. The invention adopts a rotary contact, the stroke clearance between the moving point and the static point is several times larger, under the same condition, the breakdown voltage which can be born by the invention is several times higher, and meanwhile, because the clearance is larger, the corrosion time of the electric arc to the contact is also shorter, thereby ensuring the service life of the contact and the electricity utilization safety.

(6) No heat generation: the bidirectional self-locking electromagnetic switch of the invention works statically, so that the bidirectional self-locking electromagnetic switch does not consume power and does not generate heat. Most of the conventional relays or AC contactors are burnt out due to the high heating temperature of the coil, and particularly, the conventional relays or AC contactors work remarkably in summer or high-temperature environments.

(7) The malfunction can not occur: compared with the existing relay and AC contactor, the electromagnetic coil of the invention is of a trigger turnover type, and can not automatically return and lose control due to power failure in midway of circuit faults as long as reverse trigger voltage is not input, and can not generate a contact semi-contact state and generate mechanical vibration sound due to control voltage fluctuation.

Furthermore, the bidirectional self-locking electromagnetic switch also comprises a left fixed contact, a movable contact, a right fixed contact and an insulating sleeve;

the movable contact is fixedly arranged outside the rotor shaft; the insulating sleeve is fixedly arranged on the outer surface of the movable contact; the left fixed contact and the right fixed contact are respectively and fixedly arranged at two ends of the movable contact;

the insulating sleeve is used for fixing the movable contact and insulating the fixed movable contact from the rotor shaft.

The beneficial effects of the further scheme are as follows: in the present invention, the left stationary contact and the right stationary contact are pressed from a copper plate. The movable contact is formed by pressing a copper plate. The insulating sleeve is made of insulating materials such as plastics or bakelite. The main control contact mechanism is composed of a rotor shaft, a left fixed contact, a movable contact, a right fixed contact and an insulating sleeve. The main control contacts can be combined randomly according to requirements, such as single connection and multiple connection or intermediate output.

Further, the stator shell and the stator magnetic poles form a direct current motor stator structure.

Furthermore, the two-pole rotor iron core, the rotor coil and the rotor shaft form a rotor structure capable of rotating left and right in a half-cycle manner.

Furthermore, the left sliding sheet, the sliding contact, the first rectifying diode, the second rectifying diode, the right sliding sheet, the sliding contact sleeve and the rotor shaft form an automatic power-off switching structure.

The beneficial effects of the further scheme are as follows: in the invention, the left sliding sheet and the right sliding sheet have the function of conducting electricity of the sliding contacts, the two sheets are insulated with each other and are kept to be positioned and fixed together with the stator, and the working surface is flat and smooth. And the sliding contact can slide back and forth on the planes of the left sliding sheet and the right sliding sheet and keep good conductive contact. The sliding contact sleeve plays a role in fixing the sliding contact and also plays an insulating role with the rotor shaft, and the first rectifier diode and the second rectifier diode play a role in guiding left and right in a one-way mode.

Furthermore, the rotor shaft, the right positioning pin, the spring and the left positioning pin form a mechanical bidirectional self-locking structure.

The beneficial effects of the further scheme are as follows: in the invention, the right positioning pin and the left positioning pin play a role in limiting the maximum rotation angle of the rotor. The rotor bidirectional self-locking positioning spring can only keep the rotor in a left or right static state due to the tension of the spring under the condition of no external force.

Furthermore, the rotor shaft, the left fixed contact, the movable contact, the right fixed contact and the insulating sleeve form a main control contact structure.

Further, the stator magnetic pole includes an S pole permanent magnet and an N pole permanent magnet.

Furthermore, the bidirectional self-locking electromagnetic switch also comprises a bearing seat and an integral base;

the stator shell, the two-pole rotor core, the rotor coil, the left sliding sheet, the sliding contact, the first rectifier diode, the second rectifier diode, the right sliding sheet, the sliding contact sleeve, the rotor shaft, the right positioning pin, the spring, the left positioning pin and the stator magnetic pole are combined to form a power assembly system; the power assembly system drives the movable contact and the insulating sleeve to work through the rotor shaft; the bearing seat is fixedly connected with the movable contact; the movable contact, the insulating sleeve, the power assembly system and the bearing seat are all fixedly arranged on the integral machine base.

The beneficial effects of the further scheme are as follows: in the invention, all parts of the bidirectional self-locking electromagnetic switch are integrated, and the rotor shaft is extended out to drive the main control contact to work. If the rotor shaft extends out for a long time, the number of driven contacts is large, a bearing seat needs to be added, and the overall stability and the positioning performance are improved. The whole engine base is made of insulating materials such as plastics or bakelite which are not easy to deform.

Drawings

FIG. 1 is a structural diagram of a bidirectional self-locking electromagnetic switch;

FIG. 2 is a structural diagram of a bidirectional self-locking electromagnetic switch keeping the right side still;

FIG. 3 is a block diagram of the main control contact conduction;

FIG. 4 is a block diagram of the main control contacts open;

FIG. 5 is a structural diagram of the integration of a bidirectional self-locking electromagnetic switch;

FIG. 6 is a top view structural diagram of the integration of the bidirectional self-locking electromagnetic switch;

in the figure, 1, a stator housing; 2. a two-pole rotor core; 3. a rotor coil; 4. a left slider; 5. a sliding contact; 6. a first rectifying diode; 7. a second rectifying diode; 8. a right slider; 9. a sliding contact sleeve; 10. a rotor shaft; 11. a right locating pin; 12. a spring; 13. a left locating pin; 14. a stator magnetic pole; 15. a left stationary contact; 16. a movable contact; 17. a right stationary contact; 18. an insulating sleeve; 19. a powertrain system; 20. a bearing seat; 21. and (4) an integral engine base.

Detailed Description

The embodiments of the present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, the present invention provides a bidirectional self-locking electromagnetic switch, which includes a stator housing 1, a two-pole rotor core 2, a rotor coil 3, a left slider 4, a sliding contact 5, a first rectifying diode 6, a second rectifying diode 7, a right slider 8, a sliding contact sleeve 9, a rotor shaft 10, a right positioning pin 11, a spring 12, a left positioning pin 13, and a stator magnetic pole 14;

the two-pole rotor iron core 2 is fixedly arranged inside the stator shell 1; the rotor coils 3 are uniformly wound on the outer surface of the two-pole rotor core 2; one end of the rotor coil 3 is used as a leading-out terminal B, and the other end of the rotor coil is respectively connected with the anode of the first rectifier diode 6 and the cathode of the second rectifier diode 7 through leads; the cathode of the first rectifier diode 6 and the anode of the second rectifier diode 7 are respectively connected with the left sliding sheet 4 and the right sliding sheet 8 in a one-to-one correspondence manner; one end of the sliding contact 5 is movably connected with a plane formed by the left sliding sheet 4 and the right sliding sheet 8, and the other end of the sliding contact is fixedly connected with the rotor shaft 10 through a sliding contact sleeve 9; the leading-out terminal A is led out from the sliding contact 5; the right positioning pin 11 and the left positioning pin 13 are respectively and fixedly arranged at two ends of the rotor shaft 10; the rotor shaft 10 is fixedly connected with the ground through a spring 12; the stator poles 14 are fixedly arranged on the inner wall of the stator housing 1.

The stator housing 1 is made of a magnetically conductive metal material, such as a steel plate; the two-pole rotor core 2 is made of a magnetic conductive material, such as silicon steel sheets and ferrite; the rotor coil 3 is formed by winding enameled wires; the rotor shaft 10 is made of a steel material; the left sliding sheet 4 and the right sliding sheet 8 are both made of copper sheets; the small sliding contact 5 can be made of a copper sheet, and the medium and large sliding contact 5 can be made of a carbon brush; the sliding contact sleeve 9 is made of insulating materials such as plastics or bakelite; the rotor shaft 10 is made of a steel material; the movable contact 16 is pressed by a copper plate; the insulating sleeve 18 is made of an insulating material such as plastic or bakelite. The leading-out terminal A and the leading-out terminal B are connected and led out by a flexible wire.

In the embodiment of the present invention, as shown in fig. 3, the bidirectional self-locking electromagnetic switch further includes a left fixed contact 15, a movable contact 16, a right fixed contact 17, and an insulating sleeve 18;

the moving contact 16 is fixedly arranged outside the rotor shaft 10; the insulating sleeve 18 is fixedly arranged on the outer surface of the movable contact 16; the left fixed contact 15 and the right fixed contact 17 are respectively and fixedly arranged at two ends of the movable contact 16;

the insulating bush 18 serves to fix the moving contact 16 and insulate the fixed moving contact 16 from the rotor shaft 10.

In the embodiment of the invention, as shown in fig. 3 and 4, the leading-out positions of the left stationary contact 15 and the right stationary contact 17 are respectively provided with a switch leading-out wire interface, the small-sized switch leading-out wire interface can be led out in a plug mode by using a copper sheet, and the medium-sized large-sized switch leading-out wire interface can be provided with leading-out wires by using screws.

In the present invention, the left stationary contact and the right stationary contact are pressed from a copper plate. The movable contact is formed by pressing a copper plate. The insulating sleeve is made of insulating materials such as plastics or bakelite. The main control contact mechanism is composed of a rotor shaft, a left fixed contact, a movable contact, a right fixed contact and an insulating sleeve. The main control contacts can be combined randomly according to requirements, such as single connection and multiple connection or intermediate output.

In the embodiment of the invention, as shown in fig. 1, the stator housing 1 and the stator poles 14 form a stator structure of the direct current motor.

In the embodiment of the present invention, as shown in fig. 1, the two-pole rotor core 2, the rotor coil 3 and the rotor shaft 10 constitute a rotor structure that can rotate left and right by half a cycle.

In the embodiment of the invention, as shown in fig. 1, the left sliding sheet 4, the sliding contact 5, the first rectifying diode 6, the second rectifying diode 7, the right sliding sheet 8, the sliding contact sleeve 9 and the rotor shaft 10 form an automatic power-off switching structure.

In the invention, the left sliding sheet and the right sliding sheet have the function of conducting electricity of the sliding contacts, the two sheets are insulated with each other and are kept to be positioned and fixed together with the stator, and the working surface is flat and smooth. And the sliding contact can slide back and forth on the planes of the left sliding sheet and the right sliding sheet and keep good conductive contact. The sliding contact sleeve plays a role in fixing the sliding contact and also plays an insulating role with the rotor shaft, and the first rectifier diode and the second rectifier diode play a role in guiding left and right in a one-way mode.

In the embodiment of the present invention, as shown in fig. 1, the rotor shaft 10, the right positioning pin 11, the spring 12 and the left positioning pin 13 constitute a mechanical bidirectional self-locking structure.

In the invention, the right positioning pin and the left positioning pin play a role in limiting the maximum rotation angle of the rotor. The rotor bidirectional self-locking positioning spring can only keep the rotor in a left or right static state due to the tension of the spring under the condition of no external force.

In the embodiment of the present invention, as shown in fig. 3, the rotor shaft 10, the left stationary contact 15, the movable contact 16, the right stationary contact 17, and the insulating sleeve 18 constitute a main control contact structure.

In the embodiment of the present invention, as shown in fig. 1, the stator pole 14 includes an S pole permanent magnet and an N pole permanent magnet.

In the embodiment of the present invention, as shown in fig. 5, the bidirectional self-locking electromagnetic switch further includes a bearing seat 20 and an integral base 21;

the stator shell 1, the two-pole rotor core 2, the rotor coil 3, the left sliding sheet 4, the sliding contact 5, the first rectifier diode 6, the second rectifier diode 7, the right sliding sheet 8, the sliding contact sleeve 9, the rotor shaft 10, the right positioning pin 11, the spring 12, the left positioning pin 13 and the stator magnetic pole 14 are combined to form a power assembly system 19; the power assembly system 19 drives the movable contact 16 and the insulating sleeve 18 to work through the rotor shaft 10; the bearing seat 20 is fixedly connected with the movable contact 16; the moving contact 16, the insulating sleeve 18, the power assembly system 19 and the bearing seat 20 are all fixedly arranged on the integral machine base 21.

In the invention, all parts of the bidirectional self-locking electromagnetic switch are integrated, and the rotor shaft is extended out to drive the main control contact to work. If the rotor shaft extends out for a long time, the number of driven contacts is large, a bearing seat needs to be added, and the overall stability and the positioning performance are improved. The whole engine base is made of insulating materials such as plastics or bakelite which are not easy to deform.

The working principle and the process of the invention are as follows: the invention relates to an electromagnetic inching trigger switch which can be controlled manually or by an automatic program signal, so the electromagnetic inching trigger switch has wide application, such as industrial production, agricultural machinery, military and aerospace, electric power facilities, automatic control, household appliances, intelligent remote control, transportation, chemical materials, overload protection, electric leakage protection, fire protection and power failure protection, medical equipment and the like.

When the rotor coil leads out the terminal B and adds the positive pole of the control power supply, the current returns to the rotor coil and leads out the terminal A through the rotor coil 3, the first rectifier diode 6, the left slide sheet 4 and the sliding contact 5 to form a current loop, the rotor coil 3 forms a secondary magnetic field SN pole on the two-pole rotor core 2 after passing through the current, so that the two-pole rotor core 2 and the sliding contact 5 synchronously rotate rightwards, when the sliding contact 5 slides to the right slide sheet 8 across the center line, the power supply loop of the rotor coil leading out the terminal B is disconnected, no current passes through the whole power supply loop due to the reverse phase action of the second rectifier diode 7, and the sliding contact 5 is kept in the right static state due to the acting force of the spring 12 as shown in figure 2. The left stationary contact 15 and the right stationary contact 17 driven by the rotor shaft 10 are conducted as shown in fig. 3, thereby achieving the closing action of the switch.

When the switch needs to be disconnected, the positive and negative poles of the control power supply of the rotor coil leading-out terminal A and the rotor coil leading-out terminal B are just exchanged, as shown in fig. 2. When the wiring terminal A of the rotor coil leading-out wiring terminal A is positive voltage, current passes through the sliding contact 5, the right sliding sheet 8, the second rectifier diode 7, the rotor coil 3 and the B negative pole to form a loop, an opposite-phase magnetic pole NS is generated on the two-pole rotor iron core 2 to enable the two-pole rotor iron core 2 and the sliding contact 5 to synchronously rotate leftwards, when the sliding contact 5 slides over the right sliding sheet 8 to the left sliding sheet 4, the control circuit of the rotor coil leading-out wiring terminal A and the rotor coil leading-out wiring terminal B is powered off, the first rectifier diode 6 is cut off in an opposite phase mode, no current passes through the control circuit again, the control circuit returns to the state of the graph 1, the main control contact returns to the state of the graph 4, and the left stationary contact. The process is repeated when the input anode and the input cathode of the control coil are changed after one cycle of switching is realized, and the switching is on and off. The switch can be controlled to be opened or closed only by changing the voltage triggering of the input anode and cathode of the control coil.

As shown in fig. 6, all the components of the bidirectional self-locking electromagnetic switch are integrated, and only the rotor shaft 10 is extended out to drive the main control contact to work. If the rotor shaft extends out for a long time, the number of driven contacts is large, a bearing seat needs to be added, and the overall stability and the positioning performance are improved.

The invention has the beneficial effects that:

(1) energy conservation: the working coil of the invention belongs to a point-moving type, the energizing triggering time is short, and within a few tenths of a second, one cycle can be completed within less than 1 second. Compared with the existing relay and AC contactor, the electromagnetic coil does not generate heat, so that the energy is saved.

(2) No electromagnetic interference exists: compared with relay and AC contactor, the present invention is static and has no power consumption, so that it has no electromagnetic field and radiation.

(3) Saving materials: the electromagnetic coil of the invention belongs to the trigger inching work, does not need a large coil to meet the impedance, and compared with the prior relay or AC contactor, the number of the coil can be reduced by more than half, and simultaneously, the volume and the weight are also greatly reduced.

(4) Wide voltage control: the coil of the invention adopts a inching working mode, and the difference of coil current passing at one moment is one to two times, which belongs to a safety range, so that the voltage grade does not need to be various. The present invention can simplify these voltage levels, such as: the working voltage is 3-9V, 12-36V, 110-380V and the like.

(5) The control voltage is higher: the existing relay and the existing alternating current contactor are limited by linear electromagnetic force, so that the gap between a movable contact and a fixed contact cannot be made to be too large, and the gap between the movable contact and the fixed contact of the general relay is about 1-2 mm. The invention adopts a rotary contact, the stroke clearance between the moving point and the static point is several times larger, under the same condition, the breakdown voltage which can be born by the invention is several times higher, and meanwhile, because the clearance is larger, the corrosion time of the electric arc to the contact is also shorter, thereby ensuring the service life of the contact and the electricity utilization safety.

(6) No heat generation: the bidirectional self-locking electromagnetic switch of the invention works statically, so that the bidirectional self-locking electromagnetic switch does not consume power and does not generate heat. Most of the conventional relays or AC contactors are burnt out due to the high heating temperature of the coil, and particularly, the conventional relays or AC contactors work remarkably in summer or high-temperature environments.

(7) The malfunction can not occur: compared with the existing relay and AC contactor, the electromagnetic coil of the invention is of a trigger turnover type, and can not automatically return and lose control due to power failure in midway of circuit faults as long as reverse trigger voltage is not input, and can not generate a contact semi-contact state and generate mechanical vibration sound due to control voltage fluctuation.

It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.