Double-acting self-protection electromagnetic contactor and control circuit thereof

Abstract

A double-acting self-protection electromagnetic contactor is used for solving the technical problems of coil heating and electric energy loss caused by the fact that a traditional electromagnetic relay continuously supplies power to a coil and comprises a first coil, a first permanent magnet, a second coil, a second permanent magnet and a switch control device. The first soft iron is arranged in the through hole of the first coil; the second soft iron is arranged in the through hole of the second coil; magnetic poles of adjacent sides of the first permanent magnet and the second permanent magnet are opposite; the switch control device comprises a first contact piece, a second contact piece, a first elastic reed and a second elastic reed, the first contact piece is located on the side close to the first permanent magnet and arranged at one end of the first elastic reed in the length direction, and the second contact piece is arranged at one end of the second elastic reed in the length direction. And the first elastic reed and the second elastic reed enable the first contact piece and the second contact piece to be in a separated state without external force, so that the electric energy waste is reduced, and meanwhile, the advantages of water resistance, explosion prevention, dust prevention, electric leakage prevention and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic control, and particularly relates to a double-acting self-holding electromagnetic contactor and its control circuit. Background Art

[0002] AC and DC contactors and relays are electrical control devices that cause a predetermined step change in the controlled quantity in an electrical output circuit. They are automatic switches that use small current to control large current operation and play roles such as automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] The prior patent CN216487880U of the applicant of this patent discloses an electromagnetic relay. By energizing the coil to generate the electromagnetic force of the coil, it drives the permanent magnet to move downward to make the moving and static contact pieces contact and conduct, and the electrical equipment is powered on. Under the condition of ensuring the contact and conduction state of the moving and static contact pieces, it is necessary to continuously supply current to the coil to make the first ferromagnetic metal part continuously generate magnetism to maintain the continuous extrusion force of the permanent magnet on the waterproof capsule, so as to maintain the continuous conduction of the moving contact piece and the static contact piece. This patent needs to continuously supply power to the washer to ensure the existence of the magnetism of the first ferromagnetic metal part under the conduction state. Too long power-on time will cause the coil to heat up, and the coil is prone to burnout, and the consumption of electric energy is required to maintain the conduction state. Summary of the Utility Model

[0004] In view of this, the utility model discloses a double-acting self-holding electromagnetic contactor and its control circuit, and the specific scheme is as follows:

[0005] The double-acting self-holding electromagnetic contactor includes a first coil, a first permanent magnet, a second coil, a second permanent magnet, a switch control device, a first soft iron, and a second soft iron; the switch control device is arranged between the first coil and the second coil;

[0006] The first soft iron is arranged in the through hole of the first coil, the first permanent magnet is arranged between the first coil and the switch control device and the first permanent magnet is fixedly connected with the first soft iron; the second soft iron is arranged in the through hole of the second coil, the second permanent magnet is arranged between the second coil and the switch control device and the second permanent magnet is fixedly connected with the second soft iron; the magnetic poles on the adjacent sides of the first permanent magnet and the second permanent magnet are opposite;

[0007] The switch control device includes a first contact piece, a second contact piece, a first elastic reed, and a second elastic reed. The first contact piece is located on the side close to the first permanent magnet. The first contact piece is arranged at one end of the length direction of the first elastic reed. The second contact piece is arranged at one end of the length direction of the second elastic reed. The first elastic reed and the second elastic reed keep the first contact piece and the second contact piece in a separated state without external force.

[0008] As a supplement to the technical solution of the present utility model, the switch control device further includes a third soft iron and a fourth soft iron. The third soft iron is disposed on the first contact piece, and the fourth soft iron is disposed on the second contact piece.

[0009] As a supplement to the technical solution of the present utility model, the first contact piece includes a first insulating connection plate and a first metal contact. The second contact piece includes a second insulating connection plate and a second metal contact.

[0010] The first insulating connection plate and the second insulating connection plate are disposed opposite to each other in parallel. The first insulating connection plate is located on the side close to the first coil, and the second insulating connection plate is located on the side close to the second coil.

[0011] The first metal contact is disposed on the end face of the first insulating connection plate on the side close to the second coil. One end of the first elastic spring piece in the length direction is connected to the first metal contact. The third soft iron is disposed on the end face of the first insulating connection plate on the side close to the first coil. The second metal contact is disposed on the end face of the second insulating connection plate on the side close to the first coil. One end of the second elastic spring piece in the length direction is connected to the second metal contact. The fourth soft iron is disposed on the end face of the second insulating connection plate on the side close to the second coil. The first metal contact and the second metal contact are disposed opposite to each other.

[0012] As a supplement to the technical solution of the present utility model, the number of the first elastic spring pieces and the second elastic spring pieces is at least one group, and the number of the first elastic spring pieces and the second elastic spring pieces is the same. One first metal contact is disposed at the end of each group of first elastic spring pieces, and one second metal contact is disposed at the end of each group of second elastic spring pieces, so that the number of the first metal contacts and the second metal contacts is the same. The first metal contacts on the first insulating connection plate and the second metal contacts on the second insulating connection plate are disposed correspondingly.

[0013] As a supplement to the technical solution of the present utility model, several groups of the third soft irons are disposed on the first insulating connection plate, and are evenly spaced along the length direction of the first insulating connection plate. Several groups of the fourth soft irons are disposed on the second insulating connection plate, and are evenly spaced along the length direction of the second insulating connection plate.

[0014] As a supplement to the technical solution of the present utility model, the number of the third soft irons is the same as that of the first metal contacts. The third soft irons and the first metal contacts are disposed correspondingly on the two side end faces of the first insulating plate. The number of the fourth soft irons is the same as that of the second metal contacts. The fourth soft irons and the second metal contacts are disposed correspondingly on the two side end faces of the second insulating plate.

[0015] As a supplement to the technical solution of the present utility model, it further includes an insulating housing, the insulating housing is a sealed housing with an accommodation space inside, and the insulating housing can be deformed when being extruded; the switch control device is encapsulated in the insulating housing, one end of the first elastic reed in the length direction away from the first insulating connecting plate passes through the insulating connecting housing and is located outside the insulating housing, and one end of the second elastic reed in the length direction away from the second insulating connecting plate passes through the insulating connecting housing and is located outside the insulating housing; an air hole communicating with the internal accommodation space of the insulating housing is provided on the outer side wall of the insulating housing.

[0016] As a supplement to the technical solution of the present utility model, it further includes a first coil housing, a second coil housing, a fifth soft iron, and a sixth soft iron.

[0017] The first coil housing is a hollow tubular structure, and the first coil is wound around the outer side of the first coil housing; the second coil housing is a hollow housing structure, and the second coil is wound around the outer side of the second coil housing.

[0018] The first soft iron is located inside the first coil housing, and the fifth soft iron is arranged at one end of the first coil housing away from the switch control device; the second soft iron is located inside the second coil housing, and the sixth soft iron is arranged at one end of the second coil housing away from the switch control device.

[0019] The first coil, the first coil housing, the second coil, the second coil housing, the first soft iron, the first permanent magnet, the second soft iron, the second permanent magnet, the fifth soft iron, and the sixth soft iron are all coated with a waterproof insulating material.

[0020] The present utility model also discloses a control circuit of the above double-acting self-holding electromagnetic contactor, including a power supply module, a coil module, a first double-control switch, and a second double-control switch.

[0021] The power supply module includes an AC power supply and a rectifier, and the rectifier is connected to the AC power supply.

[0022] The first double-control switch includes a first switch and a second switch. The first double-control switch can simultaneously control the first switch and the second switch to be opened or closed. The first switch is respectively connected to the rectifier and the first end of the coil module; the second switch is respectively connected to the rectifier and the second end of the coil module; the coil module includes a first coil and a second coil, and the first coil and the second coil are arranged in parallel.

[0023] The second dual-control switch includes a third switch and a fourth switch. The second dual-control switch can simultaneously control the third switch and the fourth switch to be turned on or off. The first end of the third switch is connected to the wire connecting the second switch and the negative electrode of the rectifier, and the second end of the third switch is connected to the first end of the coil module. The first end of the fourth switch is connected to the wire connecting the first switch and the positive electrode of the rectifier, and the second end of the fourth switch is connected to the second end of the coil module.

[0024] As a supplement to the technical solution of the present utility model, it further includes a first time-delay relay, a second time-delay relay, a first normally-closed contact, a second normally-closed contact, an AC relay, a capacitor, a third normally-closed contact, a fourth normally-closed contact, a first normally-open contact, and a second normally-open contact.

[0025] One end of the AC power supply of the first time-delay relay is connected to the wire between the AC power supply of the first switch and the first end of the AC power supply of the coil module, and the other end of the AC power supply of the first time-delay relay is connected to the wire between the AC power supply of the second switch and the second end of the AC power supply of the coil module. One end of the AC power supply of the second time-delay relay is connected to the wire between the AC power supply of the third switch and the first end of the AC power supply of the coil module, and the other end of the AC power supply of the second time-delay relay is connected to the wire between the AC power supply of the fourth switch and the second end of the AC power supply of the coil module.

[0026] The first normally-closed contact is arranged on the wire connecting the first switch and the rectifier, and the second normally-closed contact is arranged on the wire connecting the second switch and the rectifier. The first normally-closed contact is electrically connected to the first time-delay relay. When the first dual-control switch is closed and the current delivered by the rectifier to the first end of the coil module reaches the preset time of the first time-delay relay, the first time-delay relay controls the first normally-closed contact to disconnect. The second normally-closed contact is electrically connected to the second time-delay relay. When the second dual-control switch is closed and the current delivered by the rectifier to the second end of the coil module reaches the preset time of the second time-delay relay, the second time-delay relay controls the second normally-closed contact to disconnect.

[0027] The first end of the third normally-closed contact is connected to the positive electrode of the rectifier, and the second end of the third normally-closed contact is connected to the positive electrode of the capacitor. The first end of the fourth normally-closed contact is connected to the negative electrode of the rectifier, and the second end of the fourth normally-closed contact is connected to the negative electrode of the capacitor. The first end of the first normally-open contact is connected to the positive electrode of the capacitor, and the second end of the first normally-open contact is connected to the second end of the coil module. The first end of the second normally-open contact is connected to the negative electrode of the capacitor, and the second end of the second normally-open contact is connected to the first end of the coil module.

[0028] The AC relay is connected to an AC power supply. The third normally closed contact, the fourth normally closed contact, the first normally open contact, and the second normally open contact are electrically connected to the AC relay respectively. When the AC power supply is normally powered, the AC relay controls the third normally closed contact and the fourth normally closed contact to be in the normally closed state, and the first normally open contact and the second normally open contact to be in the normally open state;

[0029] When the AC power supply is powered off, the AC relay controls the third normally closed contact and the fourth normally closed contact to disconnect, and the first normally open contact and the second normally open contact to close.

[0030] Beneficial effects: The double-acting self-holding electromagnetic contactor disclosed in the present utility model can realize that the switch control device maintains the powered-on and powered-off states without continuously energizing the coil, avoiding the technical problem of the coil heating caused by long-term energization of the coil, and saving electric energy at the same time. In another aspect of the present utility model, by arranging the switch control device in an insulating housing, while realizing the waterproof function, the generation of electric sparks is reduced, and the use safety is improved. In another aspect of the present utility model, through the setting of the control circuit of the double-acting self-holding electromagnetic contactor, the control of the power supply to the coil can be realized, and the metal contacts in the switch control device can be separated by a capacitor when powered off, ensuring the safety when the AC power supply is powered on again. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the double-acting self-holding electromagnetic contactor of the present utility model.

[0032] Figure 2 It is a schematic structural diagram of the double-acting self-holding electromagnetic contactor of the present utility model.

[0033] Figure 3 It is the control circuit of the double-acting self-holding electromagnetic contactor of the present utility model.

[0034] In the figure: 1. First coil; 2. First permanent magnet; 3. Second coil; 4. Second permanent magnet; 5. First elastic reed; 6. Second elastic reed; 7. First soft iron; 8. Second soft iron; 9. Third soft iron; 10. Fourth soft iron; 11. Fifth soft iron; 12. Sixth soft iron; 13. First insulating connection plate; 14. Second insulating connection plate; 15. First metal contact; 16. Second metal contact; 17. Power supply module; 18. Coil module; 19. Rectifier; 20. First switch; 21. Second switch; 22. Third switch; 23. Fourth switch; 24. Third normally closed contact; 25. Fourth normally closed contact; 26. First normally closed contact; 27. Second normally closed contact; 28. Capacitor; 29. First normally open contact; 30. Second normally open contact; 31. First time-delay relay; 32. Second time-delay relay; 33. Insulating housing; 34. First coil housing; 35. Second coil housing; 36. Air hole; 37. First diode; 38. Second diode. Detailed implementation manners

[0035] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] As Figures 1 to 2 shown, the present utility model discloses a double-acting self-holding electromagnetic contactor, including a first coil 1, a first permanent magnet 2, a second coil 3, a second permanent magnet 4, and a switch control device.

[0038] The switch control device is arranged between the first coil 1 and the second coil 3;

[0039] The first soft iron 7 is disposed in the through hole of the first coil 1 and can move axially relative to the first coil 1 along its through hole. The first permanent magnet 2 is disposed between the first coil 1 and the switch control device. The first permanent magnet 2 is adsorbed on the first soft iron 7. Since the first permanent magnet 2 has two magnetic poles, a magnetic field is generated by passing a current through the first coil 1, driving the first permanent magnet 2 to move away from or close to the switch control device.

[0040] The first soft iron 7 can increase the magnetic strength generated by the first coil 1. And since the first permanent magnet 2 is fixedly connected to the first soft iron 7, when the first permanent magnet 2 moves relative to the first coil 1, the first soft iron 7 provides a guiding function for the movement of the first permanent magnet 2.

[0041] The second soft iron 8 is disposed in the through hole of the second coil 3 and can move axially relative to the second coil 3 along its through hole. The second permanent magnet 4 is disposed between the second coil 3 and the switch control device. The second permanent magnet 4 is fixedly connected to the second soft iron 8. Since the second permanent magnet 4 has two magnetic poles, a magnetic field is generated by passing a current through the second coil 3, driving the second permanent magnet 4 to move away from or close to the switch control device. The second soft iron 8 can increase the magnetic strength generated by the second coil 3. And since the second permanent magnet 4 is fixedly connected to the second soft iron 8, when the second permanent magnet 4 moves relative to the second coil 3, the second soft iron 8 provides a guiding function for the movement of the second permanent magnet 4.

[0042] The magnetic poles on the adjacent sides of the first permanent magnet 2 and the second permanent magnet 4 are opposite. For example, when the magnetic pole of the first permanent magnet 2 close to the second permanent magnet 4 is the N pole, the magnetic pole of the second permanent magnet 4 close to the first permanent magnet 2 is the S pole.

[0043] The switch control device includes a first contact piece, a second contact piece, a first elastic reed 5, and a second elastic reed 6. The first contact piece is located on the side close to the first permanent magnet 2. The first contact piece is disposed at one end in the length direction of the first elastic reed 5. The first contact piece is located on the surface of the first elastic reed close to the second permanent magnet 4. The second contact piece is disposed at one end in the length direction of the second elastic reed 6. The second contact piece is located on the surface of the second elastic reed close to the first permanent magnet 2. The other ends in the length directions of the first elastic reed 5 and the second elastic reed 6 are respectively connected to the neutral wire and the live wire. When the first contact piece and the second contact piece are in contact, the first elastic reed 5 and the second elastic reed 6 are electrically connected, realizing the power-on of the double-acting self-holding electromagnetic contactor. When the first elastic reed 5 and the second elastic reed 6 are not under external force, the first contact piece and the second contact piece are in a separated state.

[0044] Preferably, the elastic reed is an elastic spring piece made of a conductive material. Preferably, the elastic reed is made of copper. The metal contact and the elastic reed are connected by welding or riveting.

[0045] In the above technical solution, during the power-on process of the double-acting self-holding contactor, a current is passed through the first coil 1, and the magnetic force generated by the first coil 1 pushes the first permanent magnet 2 towards the switch control device. Taking the upper magnetic pole of the first permanent magnet 2 as the S pole as an example, when a current is passed through the first coil 1, the upper magnetic pole of the first coil 1 becomes the S pole. According to the principle of like poles repelling each other, the first permanent magnet 2 moves towards the switch control device. Similarly, when a current is passed through the second coil 3, the second permanent magnet 4 moves towards the switch control device. The first permanent magnet 2 pushes the first contact piece of the switch control device towards the second contact piece, and the second permanent magnet 4 pushes the second contact piece of the switch control device towards the first contact piece, so that the first contact piece and the second contact piece come into contact, achieving the power-on purpose. In the above state, the first elastic reed 5 and the second elastic reed 6 undergo elastic deformation. Since the magnetic poles of the adjacent sides of the first permanent magnet 2 and the second permanent magnet 4 are opposite, the suction force between the first permanent magnet 2 and the second permanent magnet 4 is F1. Let the force exerted by the first elastic reed 5 on the first contact piece towards the first coil 1 be F2, and the force exerted by the second elastic reed 6 on the second contact piece towards the second coil 3 be F3. When F1 > F2 and F1 > F3, the first permanent magnet 2 and the second permanent magnet 4 can be kept adsorbed in the power-on state, so that the first contact piece and the second contact piece are in contact. The above conditions can be made to hold by adjusting the magnetism of the first permanent magnet 2 and the second permanent magnet 4 and the elastic force of the first elastic reed 5 and the second elastic reed 6.

[0046] Since the first permanent magnet 2 and the second permanent magnet 4 can always be in an adsorbed state, the current passed through the first coil 1 and the second coil 3 can be disconnected, solving the technical problem that continuous power-on causes the coil to heat up and burn out, and at the same time reducing power consumption.

[0047] During the power-off process of the double-acting self-holding contactor, a current is passed through the first coil 1 and the second coil 3, so that the first coil 1 generates a suction force F4 on the first permanent magnet 2. When F4 + F2 > F1, the first permanent magnet 2 is adsorbed by the first coil 1 and separated from the second permanent magnet 4; the second coil 3 generates a suction force F5 on the second permanent magnet 4. When F5 + F3 > F1, the second permanent magnet 4 is adsorbed by the second coil 3 and separated from the first permanent magnet 2. At this time, the first elastic reed 5 and the second elastic reed 6 are no longer affected by external forces and rebound to separate the first contact piece and the second contact piece. At this time, the current passed through the first coil 1 and the second coil 3 can be disconnected, solving the technical problem that continuous power-on causes the coil to heat up and burn out, and at the same time reducing power consumption.

[0048] As a preferred technical solution of the present utility model, the switch control device further includes a third soft iron 9 and a fourth soft iron 10. The third soft iron 9 is disposed on the first contact piece, and the fourth soft iron 10 is disposed on the second contact piece. Through the arrangement of the third soft iron 9 and the fourth soft iron 10, during the power-on process, the third soft iron 9 is adsorbed on the first permanent magnet 2, and the fourth soft iron 10 is adsorbed on the second permanent magnet 4. During the power-off process, when a current is passed into the first and second coils, and the first permanent magnet 2 moves toward the first coil 1 under the adsorption force of the first coil 1, the third soft iron 9 is always adsorbed on the first permanent magnet 2, enabling the first permanent magnet 2 to drive the first contact piece to move toward the first coil 1. Similarly, the second permanent magnet 4 can drive the second contact piece to move toward the second coil 3. Through the arrangement of the third soft iron 9 and the fourth soft iron 10, the technical problem that the first elastic reed 5 and the second elastic reed 6 have reduced elasticity or are deformed after a long service time and cannot separate the first contact piece and the second contact piece by their own elastic force can be solved.

[0049] As a preferred technical solution of the present utility model, the first contact piece includes a first insulating connecting plate 13 and a first metal contact 15, and the second contact piece includes a second insulating connecting plate 14 and a second metal contact 16.

[0050] The first insulating connecting plate 13 and the second insulating connecting plate 14 are arranged relatively parallel to each other. The first insulating connecting plate 13 is located on the side close to the first coil 1, and the second insulating connecting plate 14 is located on the side close to the second coil 3. Both the first insulating connecting plate 13 and the second insulating connecting plate 14 are plate-like structures made of insulating materials.

[0051] The first metal contact 15 is disposed on the end surface of the first insulating connecting plate 13 on the side close to the second coil 3. One end of the first elastic reed 5 in the length direction is connected to the first metal contact 15. Through the arrangement of the first elastic reed 5, the first insulating connecting plate 13 and the first metal contact 15 are suspended in the space between the first coil 1 and the second coil 3. The third soft iron 9 is disposed on the end surface of the first insulating connecting plate 13 on the side close to the first coil 1.

[0052] The second metal contact 16 is disposed on the end surface of the second insulating connecting plate 14 on the side close to the first coil 1. One end of the second elastic reed 6 in the length direction is connected to the second metal contact 16. Through the arrangement of the second elastic reed 6, the second insulating connecting plate 14 and the second metal contact 16 are suspended in the space between the first coil 1 and the second coil 3. The fourth soft iron 10 is disposed on the end surface of the second insulating connecting plate 14 on the side close to the second coil 3.

[0053] When the first metal contact 15 and the second metal contact 16 are arranged opposite to each other so that the first insulating connecting plate 13 and the second insulating connecting plate 14 move relative to each other, the first metal contact 15 and the second metal contact 16 can come into contact.

[0054] Preferably, both the first metal contact 15 and the second metal contact 16 are made of conductive metal material. Preferably, the metal contact material is silver.

[0055] In the above technical solution, when the switch control device performs the power-on step, the first permanent magnet 2 is subjected to the repulsive force applied by the first coil 1, driving the first insulating connecting plate 13 to move towards the second insulating connecting plate 14. Similarly, the second insulating connecting plate 14 moves towards the first insulating connecting plate 13, causing the first metal contact 15 and the second metal contact 16 to come into contact, realizing the conduction of the first elastic reed 5 and the second elastic reed 6. When the switch control device performs the power-off step, current is passed through the first coil 1 and the second coil 3, causing the first coil 1 to generate an attractive force on the first permanent magnet 2 and the second coil 3 to generate an attractive force on the second permanent magnet 4, causing the first permanent magnet 2 to drive the third soft iron 9 to move towards the first coil 1, and the second permanent magnet 4 to drive the fourth soft iron 10 to move towards the second coil 2, separating the first metal contact 15 from the second metal contact 16.

[0056] As a preferred technical solution of the present invention, it further includes an insulating housing 33. The insulating housing 33 is a sealed housing with an accommodation space inside. The switch control device is encapsulated in the insulating housing 33. One end of the first elastic reed 5 in the length direction away from the first insulating connecting plate 13 passes through the insulating connecting housing 17 and is fixedly connected to a support seat arranged outside the insulating housing 3317, enabling the first elastic reed 5 to support the first insulating connecting plate 13 and making the first insulating connecting plate 13 float in the insulating housing 33. One end of the second elastic reed 6 in the length direction away from the second insulating connecting plate 14 passes through the insulating connecting housing 17 and is fixedly connected to a support seat arranged outside the insulating housing 3317, enabling the second elastic reed 6 to support the second insulating connecting plate 14 and making the second insulating connecting plate 14 float in the insulating housing 33. The insulating housing 33 is made of a flexible and deformable material, enabling the insulating housing 33 to undergo elastic deformation under the extrusion of the first permanent magnet 2 and the second permanent magnet 4.

[0057] Due to the setting of the insulating housing 33, in the above embodiments, the magnetic force magnitudes of the first permanent magnet 2 and the second permanent magnet 4, the distance between the first coil 1 and the second coil 3, and the elastic force magnitudes of the first elastic reed 5 and the second elastic reed 6 need to be adaptively set to enable the normal use function of the double-acting self-holding contactor to be satisfied.

[0058] Preferably, air holes 36 communicating with the internal accommodation space are provided on the outer side wall of the insulating housing 33. Inert gas can be filled into the insulating housing 33 or the insulating housing 33 can be evacuated through the air holes 36, and then the air holes 36 are sealed with sealant to further avoid the generation of electric sparks inside the insulating housing 33.

[0059] Preferably, the insulating housing 33 can be made of insulating materials such as rubber and glass. Preferably, the insulating housing 33 is a waterproof capsule.

[0060] The utility model is applied to high-voltage and high-current scenarios. In this application scenario, electric sparks will be generated instantaneously when the first metal contact 15 contacts the second metal contact 16, interfering with surrounding electronic devices and circuits and even causing a fire. By arranging the switch control device inside the insulating housing 33, the technical problem of electric sparks interfering with surrounding electronic devices or circuits is solved.

[0061] Preferably, as a preferred technical solution of the utility model, it further includes a first coil housing 34, a second coil housing 35, a fifth soft iron 11, and a sixth soft iron 12.

[0062] The first coil housing 34 is a hollow tubular structure, and the first coil 1 is wound around the outer side of the first coil housing 34; the second coil housing 35 is a hollow housing structure, and the second coil 3 is wound around the outer side of the second coil housing 35.

[0063] The first soft iron 7 is located inside the first coil housing 34, and the fifth soft iron 11 is arranged at one end of the first coil housing 34 away from the switch control device. During the power-off process of the double-acting self-holding contactor, the first permanent magnet 2 is adsorbed by the first coil 1, causing the first soft iron 7 to be driven by the first permanent magnet 2 to move inside the first coil housing 34 in the direction of the fifth soft iron 11. Since the first soft iron 7 is magnetized by the first permanent magnet 2, the first soft iron 7 is adsorbed on the fifth soft iron 11.

[0064] During the power-on process of the double-acting self-holding contactor, the magnetic force generated by the first coil 1 pushes the first permanent magnet 2 towards the switch control device, separating the first soft iron 7 from the fifth soft iron 11.

[0065] Through the setting of the fifth soft iron 11, the first permanent magnet 2 and the first soft iron 7 are fixed when the double-acting self-holding contactor is in the power-off state.

[0066] The second soft iron 8 is located within the second coil housing 35, and the sixth soft iron 12 is disposed at one end of the second coil housing 35 away from the switch control device. During the power-off process of the double-acting self-holding contactor, the second permanent magnet 4 is adsorbed by the second coil 3, causing the second soft iron 8 to be driven by the second permanent magnet 4 to move within the second coil housing 35 in the direction of the sixth soft iron 12. Since the second soft iron 8 is magnetized by the second permanent magnet 4, the second soft iron 8 is adsorbed onto the sixth soft iron 12.

[0067] During the power-on process of the double-acting self-holding contactor, the magnetic force generated by the second coil 3 pushes the second permanent magnet 4 towards the switch control device, separating the second soft iron 8 from the sixth soft iron 12.

[0068] By providing the sixth soft iron 12, the second permanent magnet 4 and the second soft iron 8 are fixed when the double-acting self-holding contactor is in the power-off state.

[0069] Preferably, after the first coil 1 is wound around the first coil housing 34, insulating waterproof material is poured thereon to achieve the rust prevention and insulation effects of the first coil 1. After the second coil 3 is wound around the second coil housing 35, insulating waterproof material is poured thereon to achieve the rust prevention and insulation effects of the second coil 3.

[0070] After the first soft iron 7 and the first permanent magnet 2 are connected, insulating waterproof material is poured thereon to achieve the rust prevention effect. After the second soft iron 8 and the second permanent magnet 4 are connected, insulating waterproof material is poured thereon to achieve the rust prevention effect. The surfaces of the fifth soft iron 11 and the sixth soft iron 12 are also poured with insulating waterproof material to achieve their rust prevention effects.

[0071] Preferably, the above-mentioned insulating waterproof material can be selected from materials such as rubber, plastic, and epoxy resin.

[0072] Through the above settings, the rust prevention and waterproof functions of the first coil 1 and the second coil 3 are achieved, enabling the double-acting self-holding electromagnetic contactor disclosed in the present utility model to work underwater.

[0073] As a preferred technical solution of the present utility model, the number of the first elastic reed 5 and the second elastic reed 6 is at least one group, and the number of the first elastic reed 5 and the second elastic reed 6 is the same. One first metal contact 15 is provided at the end of each group of the first elastic reeds 5, and one second metal contact 16 is provided at the end of each group of the second elastic reeds 6, so that the number of the first metal contacts 15 is the same as that of the first elastic reeds 5, the number of the second metal contacts 16 is the same as that of the second elastic reeds 6, the number of the first metal contacts 15 and the second metal contacts 16 is the same, and the first metal contacts 15 on the first insulating connection plate 13 and the second metal contacts 16 on the second insulating connection plate 14 are arranged in correspondence.

[0074] As Figure 1As shown, there are four sets of first metal contacts 15 on the first insulating connection plate 13 and four sets of second metal contacts 16 on the second insulating connection plate 14, and they are arranged one by one vertically and correspondingly, so that each set of first metal contacts 15 contacts the corresponding set of second metal contacts 16 in the powered-on state. Through the above settings, the connection or disconnection of multiple groups of circuits can be controlled simultaneously. Two adjacent metal contacts on the same insulating metal connection plate should be arranged at intervals.

[0075] Preferably, the number of the first metal contacts 15 and the second metal contacts 16 is four sets each.

[0076] The number of the third soft iron 9 and the fourth soft iron 10 can be only one set. Preferably, to improve the stability of the switch control device, several groups of the third soft iron 9 are provided on the first insulating connection plate 13 and are evenly spaced along the length direction of the first insulating connection plate 13; several groups of the fourth soft iron 10 are provided on the second insulating connection plate 14 and are evenly spaced along the length direction of the second insulating connection plate 14. Preferably, the number of the third soft iron 9 is the same as that of the first metal contacts 15, the third soft iron 9 and the first metal contacts 15 are correspondingly arranged on both side end faces of the first insulating plate, and a set of the third soft iron 9 is correspondingly provided above each set of the first metal contacts 15; the number of the fourth soft iron 10 is the same as that of the second metal contacts 16, the fourth soft iron 10 and the second metal contacts 16 are correspondingly arranged on both side end faces of the second insulating plate, and a set of the fourth soft iron 10 is correspondingly provided below each set of the second metal contacts 16.

[0077] The present utility model also discloses a control circuit of the above double-acting self-holding electromagnetic contactor, as Figure 3 shown, which includes a power supply module 17, a coil module 18, a first double-control switch, and a second double-control switch.

[0078] The power supply module 17 includes an AC power supply and a rectifier 19, and the rectifier 19 is connected to the AC power supply and is used to convert alternating current into direct current.

[0079] The first double-control switch includes a first switch 20 and a second switch 21, and the first double-control switch can control the opening or closing of the first switch 20 and the second switch 21 simultaneously. The first switch 20 is respectively connected to the rectifier 19 and the first end of the coil module 18; the second switch 21 is respectively connected to the rectifier 19 and the second end of the coil module 18. By closing or disconnecting the first double-control switch, it is used to control the input of current to the coil module 18. When the first double-control switch is controlled to be closed, the rectifier 19 delivers current to the coil module 18, so that the coil module 18 works to generate magnetism. When the first double-control switch is controlled to be disconnected, the rectifier 19 stops delivering current to the coil module 18, so that the coil module 18 does not generate magnetism.

[0080] The coil module 18 includes a first coil 1 and a second coil 3. The first coil 1 and the second coil 3 are arranged in parallel. By setting the winding directions of the first coil 1 and the second coil 3 to be different, when the current flowing directions in the first coil 1 and the second coil 3 are the same, the magnetic poles generated on the same side are opposite.

[0081] The second double - control switch includes a third switch 22 and a fourth switch 23. The second double - control switch can control the third switch 22 and the fourth switch 23 to open or close simultaneously. The first end of the third switch 22 is connected to the wire where the second switch 21 is connected to the negative pole of the rectifier 19, and the second end of the third switch 22 is connected to the first end of the coil module 18. The first end of the fourth switch 23 is connected to the wire where the first switch 20 is connected to the positive pole of the rectifier 19, and the second end of the fourth switch 23 is connected to the second end of the coil module 18.

[0082] The first double - control switch and the second double - control switch cannot be closed simultaneously. When the first double - control switch is closed, the second double - control switch should be open; when the second double - control switch is closed, the first double - control switch should be open.

[0083] When controlling the first double - control switch to close, the magnetic force generated by the first coil 1 pushes the first permanent magnet 2 towards the switch control device, and the magnetic force generated by the second coil 3 pushes the second permanent magnet 4 towards the switch control device. The first permanent magnet 2 and the second permanent magnet 4 squeeze the insulating housing 33, making the first contact piece and the second contact piece contact each other, realizing the power - on function.

[0084] When controlling the second double - control switch to close, the magnetic force generated after the first coil 1 is energized attracts the first permanent magnet 2, causing the first permanent magnet 2 to adsorb and drive the third soft iron 9 towards the direction of the fifth soft iron 11. The magnetic force generated after the second coil 3 is energized attracts the second permanent magnet 4, causing the second permanent magnet 4 to adsorb and drive the fourth soft iron 10 towards the direction of the sixth soft iron 12, separating the first contact piece and the second contact piece, realizing the power - off function.

[0085] Preferably, both the first double - control switch and the second double - control switch are self - resetting switches. Pressing the first double - control switch and the second double - control switch for 0.2 s can complete the power - sending function. The switch can automatically rebound to open after being pressed by the operator, avoiding the situation where the first double - control switch and the second double - control switch are closed simultaneously because the operator forgets to disconnect the switch, and also avoiding the situation of continuous power supply and power loss caused by the operator forgetting to turn off the switch.

[0086] Preferably, the control circuit of the double - acting self - holding electromagnetic contactor further includes a first normally - closed contact 26 and a second normally - closed contact 27. The first normally - closed contact 26 is arranged on the wire connecting the first switch 20 and the rectifier 19, and the second normally - closed contact 27 is arranged on the wire connecting the second switch 21 and the rectifier 19.

[0087] Preferably, the control circuit of the double-acting self-holding electromagnetic contactor further includes a first time-delay relay 31 and a second time-delay relay 32. One end of the first time-delay relay 31 is connected to the wire between the first switch 20 and the first end of the coil module, and the other end of the first time-delay relay 31 is connected to the wire between the second switch 21 and the second end of the coil module. One end of the second time-delay relay 32 is connected to the wire between the third switch 22 and the first end of the coil module, and the other end of the second time-delay relay 32 is connected to the wire between the fourth switch 23 and the second end of the coil module.

[0088] The first time-delay relay 31 is used to control the first normally-closed contact 26. When the first double-control switch is closed and the current delivered by the rectifier 19 to the first end of the coil module reaches the preset time of the first time-delay relay 31, the first time-delay relay 31 controls the first normally-closed contact 26 to disconnect. The first time-delay relay 31 is used to control the second normally-closed contact 27. When the second double-control switch is closed and the current delivered by the rectifier 19 to the second end of the coil module reaches the preset time of the second time-delay relay 32, the second time-delay relay 32 controls the second normally-closed contact 27 to disconnect. Through the above settings of the first time-delay relay 31 and the second time-delay relay 32, it is possible to cut off the circuit in the case of the failure of the first double-control switch and the second double-control switch, prevent power loss, and further control and protect the circuit. Preferably, the preset times of the first time-delay relay 31 and the second time-delay relay 32 are set to be able to meet the closing time of the metal contacts of the double-static self-holding electromagnetic contactor. Since the first double-control switch and the second double-control switch are manually controlled to close, their closing time is generally longer than the closing time of the metal contacts of the double-static self-holding electromagnetic contactor. By setting the first time-delay relay 31 and the second time-delay relay 32, the waste of electric energy can be further reduced.

[0089] As a preferred technical solution of the present invention, the control circuit of the double-acting self-holding electromagnetic contactor further includes a capacitor 28, an AC relay, a third normally-closed contact 24, a fourth normally-closed contact 25, a first normally-open contact 29, and a second normally-open contact 30.

[0090] The first end of the third normally-closed contact 24 is connected to the positive pole of the rectifier 19, and the second end of the third normally-closed contact 24 is connected to the positive pole of the capacitor 28. The first end of the fourth normally-closed contact 25 is connected to the negative pole of the rectifier 19, and the second end of the fourth normally-closed contact 25 is connected to the negative pole of the capacitor 28. The first end of the first normally-open contact 29 is connected to the positive pole of the capacitor 28, and the second end of the first normally-open contact 29 is connected to the second end of the coil module 18. The first end of the second normally-open contact 30 is connected to the negative pole of the capacitor 28, and the second end of the second normally-open contact 30 is connected to the first end of the coil module 18.

[0091] The AC relay is connected to the AC power supply. The third normally closed contact 24, the fourth normally closed contact 25, the first normally open contact 29, and the second normally open contact 30 are respectively connected to the AC relay. When the AC power supply is normally powered, the AC relay controls the third normally closed contact 24 and the fourth normally closed contact 25 to be in the normally closed state, so that the capacitor 2828 is always in the charging state. The AC relay controls the first normally open contact 29 and the second normally open contact 30 to be in the normally open state. When the AC power supply suddenly loses power, the power supply module cannot supply power. At this time, if the switch control device is in the powered-on state, that is, the first metal contact 15 is in contact with the second metal contact 16, when the power supply module supplies power again, it may cause safety accident problems.

[0092] At this time, the AC relay controls the third normally closed contact 24 and the fourth normally closed contact 25 to disconnect, and the first normally open contact 29 and the second normally open contact 30 to close, so that the capacitor 28 supplies power to the coil module, separates the first metal contact 15 from the second metal contact 16, and realizes that the double-acting self-holding electromagnetic contactor is in the power-off state, ensuring the use safety of the double-acting self-holding electromagnetic contactor.

[0093] As a preferred technical solution of the present invention, it further includes a first diode 37 and a second diode 38. The first diode 37 is arranged on the wire connecting the second end of the third switch and the first end of the coil module, and the second diode 38 is arranged on the wire connecting the second end of the fourth switch and the second end of the coil module. Through the arrangement of the first diode 37 and the second diode 38, the safety of the circuit can be protected.

[0094] The present invention also discloses a usage method of the above circuit. First, the first double-control switch and the second double-control switch are in the off state. The AC relay controls the third normally closed contact 24 and the fourth normally closed contact 25 to be in the closed state, and the first normally open contact 29 and the second normally open contact 30 to be in the off state. At this time, the capacitor 28 is in a continuous charging state.

[0095] When it is necessary to make the first metal contact 15 of the switch control device contact the second metal contact 16, press the first double-control switch. At this time, the first coil 1 and the second coil 3 of the coil module 18 are energized, achieving the purpose of closing the first metal contact 15 and the second metal contact 16. During this process, when the current passed into the coil module 18 reaches the time set by the first time-delay relay 31, the first time-delay relay 31 controls the first normally-closed contact 26 to disconnect. The moment the first double-control switch is closed, the purpose of making the first metal contact 15 contact the second metal contact 16 can be achieved. Therefore, the first double-control switch is set as a self-resetting switch, without the need for manual repeated pressing to make it closed or disconnected. Only one pressing action is required to achieve the power-on and power-off processes. Through practice, the first double-control switch can achieve the purpose of making the first metal contact 15 contact the second metal contact 16 after being closed for about 0.2S.

[0096] When it is necessary to separate the first metal contact 15 of the switch control device from the second metal contact 16, press the second double-control switch. At this time, the first coil 1 and the second coil 3 of the coil module 18 are energized in the reverse direction, separating the first metal contact 15 and the second metal contact 16. During this process, when the current passed into the coil module 18 reaches the time set by the second time-delay relay 32, the second time-delay relay 32 controls the second normally-closed contact 27 to disconnect. The moment the second double-control switch is closed, the purpose of separating the first metal contact 15 from the second metal contact 16 can be achieved. Therefore, the second double-control switch is set as a self-resetting switch, without the need for manual repeated pressing to make it closed or disconnected. Only one pressing action is required to achieve the power-on and power-off processes. Through practice, the second double-control switch can achieve the purpose of separating the first metal contact 15 from the second metal contact 16 after being closed for about 0.2S.

[0097] When the power supply module suddenly loses power and the switch control device is in the power-on state, at this time, the AC relay controls the third normally-closed contact 24 and the fourth normally-closed contact 25 to disconnect, and the first normally-open contact 29 and the second normally-open contact 30 to close. The capacitor 28 delivers current towards the second end direction of the coil module 18, separating the first metal contact 15 and the second metal contact 16, ensuring the safety when the power supply module is powered on again.

[0098] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. Double-acting self-holding electromagnetic contactor, characterized in that, It includes a first coil (1), a first permanent magnet (2), a second coil (3), a second permanent magnet (4), a switch control device, a first soft iron (7), and a second soft iron (8); the switch control device is arranged between the first coil (1) and the second coil (3); The first soft iron (7) is arranged in the through hole of the first coil (1), the first permanent magnet (2) is arranged between the first coil (1) and the switch control device and the first permanent magnet (2) is fixedly connected to the first soft iron (7); the second soft iron (8) is arranged in the through hole of the second coil (3), the second permanent magnet (4) is arranged between the second coil (3) and the switch control device and the second permanent magnet (4) is fixedly connected to the second soft iron (8); the magnetic poles of the adjacent sides of the first permanent magnet (2) and the second permanent magnet (4) are opposite; The switch control device includes a first contact piece, a second contact piece, a first elastic reed (5), and a second elastic reed (6). The first contact piece is located on the side close to the first permanent magnet (2), the first contact piece is arranged at one end of the length direction of the first elastic reed (5), the second contact piece is arranged at one end of the length direction of the second elastic reed (6), and the first elastic reed (5) and the second elastic reed (6) keep the first contact piece and the second contact piece in a separated state without external force.

2. The double-acting self-holding electromagnetic contactor according to claim 1, wherein, The switch control device further includes a third soft iron (9) and a fourth soft iron (10). The third soft iron (9) is arranged on the first contact piece, and the fourth soft iron (10) is arranged on the second contact piece.

3. The double-acting self-holding electromagnetic contactor according to claim 2, characterized in that, The first contact piece includes a first insulating connecting plate (13) and a first metal contact (15), and the second contact piece includes a second insulating connecting plate (14) and a second metal contact (16). The first insulating connecting plate (13) and the second insulating connecting plate (14) are arranged relatively parallel. The first metal contact (15) is arranged on the end face of the first insulating connecting plate (13) close to the second coil (3). One end of the length direction of the first elastic reed (5) is connected to the first metal contact (15), and the third soft iron (9) is arranged on the end face of the first insulating connecting plate (13) close to the first coil (1); the second metal contact (16) is arranged on the end face of the second insulating connecting plate (14) close to the first coil (1). One end of the length direction of the second elastic reed (6) is connected to the second metal contact (16), and the fourth soft iron (10) is arranged on the end face of the second insulating connecting plate (14) close to the second coil (3). The first metal contact (15) and the second metal contact (16) are arranged relatively.

4. The double-acting self-holding electromagnetic contactor according to claim 3, characterized in that, The number of the first elastic reed (5) and the second elastic reed (6) is at least one set, and the number of the first elastic reed (5) and the second elastic reed (6) is the same. One first metal contact (15) is provided at the end of each group of the first elastic reeds (5), and one second metal contact (16) is provided at the end of each group of the second elastic reeds (6), so that the number of the first metal contacts (15) and the second metal contacts (16) is the same. The first metal contacts (15) on the first insulating connecting plate (13) and the second metal contacts (16) on the second insulating connecting plate (14) are arranged correspondingly.

5. The double-acting self-holding electromagnetic contactor according to claim 3, characterized in that, Several groups of the third soft iron (9) are provided on the first insulating connecting plate (13), and they are evenly spaced along the length direction of the first insulating connecting plate (13); several groups of the fourth soft iron (10) are provided on the second insulating connecting plate (14), and they are evenly spaced along the length direction of the second insulating connecting plate (14).

6. The double-acting self-holding electromagnetic contactor according to claim 4, characterized in that, The number of the third soft iron (9) is the same as that of the first metal contact (15), and the third soft iron (9) and the first metal contact (15) are arranged correspondingly on the two side end faces of the first insulating plate. The number of the fourth soft iron (10) is the same as that of the second metal contact (16), and the fourth soft iron (10) and the second metal contact (16) are arranged correspondingly on the two side end faces of the second insulating plate.

7. The double-acting self-locking electromagnetic contactor according to claim 1, characterized in that It further includes an insulating housing (33). The insulating housing (33) is a sealed housing with an accommodation space inside, and the insulating housing (33) can be deformed when being extruded; the switch control device is encapsulated in the insulating housing (33). One end of the first elastic reed (5) far away from the first insulating connecting plate (13) in the length direction passes through the insulating connecting housing and is located outside the insulating housing (33), and one end of the second elastic reed (6) far away from the second insulating connecting plate (14) in the length direction passes through the insulating connecting housing and is located outside the insulating housing (33); air holes (36) communicating with the internal accommodation space are provided on the outer side wall of the insulating housing (33).

8. The double-acting self-holding electromagnetic contactor according to claim 1, characterized in that, It further includes a first coil housing (34), a second coil housing (35), a fifth soft iron (11), and a sixth soft iron (12). The first coil housing (34) is of a hollow tubular structure, and the first coil (1) is wound on the outer side of the first coil housing (34); the second coil housing (35) is of a hollow housing-like structure, and the second coil (3) is wound on the outer side of the second coil housing (35). The first soft iron (7) is located inside the first coil housing (34), and the fifth soft iron (11) is arranged at one end of the first coil housing (34) far away from the switch control device; the second soft iron (8) is located inside the second coil housing (35), and the sixth soft iron (12) is arranged at one end of the second coil housing (35) far away from the switch control device. The first coil (1), the first coil housing (34), the second coil (3), the second coil housing (35), the first soft iron (7), the first permanent magnet (2), the second soft iron (8), the second permanent magnet (4), the fifth soft iron (11), and the sixth soft iron (12) are all coated with a waterproof insulating material.

9. A control circuit applied to the double-acting self-holding electromagnetic contactor described in claim 1, characterized in that, It includes a power supply module (17), a coil module (18), a first double-control switch, and a second double-control switch. The power supply module (17) includes an AC power supply and a rectifier (19), and the rectifier (19) is connected to the AC power supply. The first double-control switch includes a first switch (20) and a second switch (21). The first double-control switch can simultaneously control the first switch (20) and the second switch (21) to open or close. The first switch (20) is respectively connected to the rectifier (19) and the first end of the coil module (18); the second switch (21) is respectively connected to the rectifier (19) and the second end of the coil module (18); the coil module (18) includes a first coil (1) and a second coil (3), and the first coil (1) and the second coil (3) are arranged in parallel. The second double-control switch includes a third switch (22) and a fourth switch (23). The second double-control switch can simultaneously control the third switch (22) and the fourth switch (23) to open or close. The first end of the third switch (22) is connected to the wire connected between the second switch (21) and the negative pole of the rectifier (19), and the second end of the third switch (22) is connected to the first end of the coil module (18); the first end of the fourth switch (23) is connected to the wire connected between the first switch (20) and the positive pole of the rectifier (19), and the second end of the fourth switch (23) is connected to the second end of the coil module (18).

10. The control circuit of the double-acting self-holding electromagnetic contactor according to claim 9, characterized in that, It also includes a first time-delay relay (31), a second time-delay relay (32), a first normally-closed contact (26), a second normally-closed contact (27), an AC relay, a capacitor (28), a third normally-closed contact (24), a fourth normally-closed contact (25), a first normally-open contact (29), and a second normally-open contact (30). One end of the first time-delay relay (31) is connected to the wire between the first switch (20) and the first end of the coil module (18), and the other end of the first time-delay relay (31) is connected to the wire between the second switch (21) and the second end of the coil module (18); one end of the second time-delay relay (32) is connected to the wire between the third switch (22) and the first end of the coil module (18), and the other end of the second time-delay relay (32) is connected to the wire between the fourth switch (23) and the second end of the coil module (18). The first normally-closed contact (26) is disposed on the wire connecting the first switch (20) and the rectifier (19), and the second normally-closed contact (27) is disposed on the wire connecting the second switch (21) and the rectifier (19); the first normally-closed contact (26) is electrically connected to the first time-delay relay (31). When the first double-control switch is closed and the current delivered by the rectifier (19) towards the first end of the coil module reaches the preset time of the first time-delay relay (31), the first time-delay relay (31) controls the first normally-closed contact (26) to disconnect; the second normally-closed contact (27) is electrically connected to the second time-delay relay (32). When the second double-control switch is closed and the current delivered by the rectifier (19) towards the second end of the coil module reaches the preset time of the second time-delay relay (32), the second time-delay relay (32) controls the second normally-closed contact (27) to disconnect; The first end of the third normally-closed contact (24) is connected to the positive pole of the rectifier (19), and the second end of the third normally-closed contact (24) is connected to the positive pole of the capacitor (28). The first end of the fourth normally-closed contact (25) is connected to the negative pole of the rectifier (19), and the second end of the fourth normally-closed contact (25) is connected to the negative pole of the capacitor (28); the first end of the first normally-open contact (29) is connected to the positive pole of the capacitor (28), and the second end of the first normally-open contact (29) is connected to the second end of the coil module (18); the first end of the second normally-open contact (30) is connected to the negative pole of the capacitor (28), and the second end of the second normally-open contact (30) is connected to the first end of the coil module (18); The AC relay is connected to the AC power supply. The third normally-closed contact (24), the fourth normally-closed contact (25), the first normally-open contact (29), and the second normally-open contact (30) are respectively electrically connected to the AC relay. When the AC power supply supplies power normally, the AC relay controls the third normally-closed contact (24) and the fourth normally-closed contact (25) to be in the normally-closed state, and the first normally-open contact (29) and the second normally-open contact (30) to be in the normally-open state; When the AC power supply is powered off, the AC relay controls the third normally-closed contact (24) and the fourth normally-closed contact (25) to disconnect, and the first normally-open contact (29) and the second normally-open contact (30) to close.

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