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

Abstract

A double-static self-protection electromagnetic contactor belongs to the field of electromagnetic control, 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 second coil, a first ferromagnetic metal part, a second ferromagnetic metal part, a first permanent magnet, a second permanent magnet and a switch control device, the second coil is arranged on one side of the first coil, a certain distance is reserved between the second coil and the first coil, the first ferromagnetic metal part is arranged in the through hole of the first coil, and the second ferromagnetic metal part is arranged in the through hole of the second coil; the switch control device is arranged between the first coil and the second coil and comprises two sets of oppositely-arranged contact pieces, a first permanent magnet is arranged on the first contact piece, a second permanent magnet is arranged on the second contact piece, and the magnetic poles of the adjacent sides of the first permanent magnet and the second permanent magnet are opposite. Meanwhile, the device has the advantages of water resistance, explosion resistance, dust resistance, electric leakage resistance and the like.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic control, and particularly relates to a double-static 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 a controlled quantity in an electrical output circuit. They are an automatic switch that uses a small current to control a large current operation and play roles such as automatic regulation, safety protection, and circuit conversion in a circuit.

[0003] The prior patent CN216487880U of the applicant of this patent discloses an electromagnetic relay. By energizing a coil to generate the electromagnetic force of the coil, it drives a permanent magnet to move downward to make the moving and static contact pieces contact and conduct, and the electrical equipment is powered on. When 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 component continuously generate magnetism to maintain the continuous squeezing 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 component when maintaining 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 electrical energy is required to maintain the conduction state. Summary of the Utility Model

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

[0005] A double-static self-holding electromagnetic contactor includes a first coil, a second coil, a first ferromagnetic metal component, a second ferromagnetic metal component, a first permanent magnet, a second permanent magnet, and a switch control device;

[0006] The second coil is arranged on one side of the first coil and has a certain distance from the first coil. The first ferromagnetic metal component is arranged in the through hole of the first coil, and the second ferromagnetic metal component is arranged in the through hole of the second coil;

[0007] The switch control device is arranged between the first coil and the second coil and includes two groups of oppositely arranged contact pieces, a first permanent magnet, and a second permanent magnet. The two groups of contact pieces are respectively a first contact piece and a second contact piece. The first contact piece is provided with a first permanent magnet, the second contact piece is provided with a second permanent magnet, and the magnetic poles of the adjacent sides of the first permanent magnet and the second permanent magnet are opposite.

[0008] As a preferred technical solution of the utility model, the first contact piece includes a first insulating connecting plate and a first metal contact, and the second contact piece includes a second insulating connecting plate and a second metal contact;

[0009] The first insulating connection plate and the second insulating connection plate are arranged relatively parallel, with the first insulating connection plate on the side close to the first coil and the second insulating connection plate on the side close to the second coil;

[0010] The first metal contact is arranged on the end face of the first insulating connection plate on the side close to the second coil, and the first permanent magnet is arranged on the end face of the first insulating connection plate on the side close to the first coil;

[0011] The second metal contact is arranged on the end face of the second insulating connection plate on the side close to the first coil, and the second permanent magnet is arranged on the end face of the second insulating connection plate on the side close to the second coil.

[0012] As a preferred technical solution of the present utility model, it further includes an insulating housing, which is a sealed housing with an accommodation space inside, and the switch control device is encapsulated in the insulating housing.

[0013] As a preferred technical solution of the present utility model, an air injection hole is provided on the side wall of the insulating housing.

[0014] As a preferred technical solution of the present utility model, at least one group of the first metal contact on the first insulating connection plate and the second metal contact on the second insulating connection plate are provided, and the number of the first metal contacts and the second metal contacts is the same and they are arranged in one-to-one correspondence.

[0015] As a preferred technical solution of the present utility model, several groups of the first permanent magnets on the first insulating connection plate are provided and are evenly spaced along the length direction of the first insulating connection plate; several groups of the second permanent magnets on the second insulating connection plate are provided and are evenly spaced along the length direction of the second insulating connection plate.

[0016] As a preferred technical solution of the present utility model, the number of the first permanent magnets and the first metal contacts is the same, and the first permanent magnets and the first metal contacts are arranged in correspondence on the two end faces of the first insulating plate; the number of the second permanent magnets and the second metal contacts is the same, and the second permanent magnets and the second metal contacts are arranged in correspondence on the two end faces of the second insulating plate.

[0017] As a preferred technical solution of the present utility model, it further includes a first coil housing and a second coil housing,

[0018] The first coil housing is a hollow tubular structure, the first coil is wound around the outside of the first coil housing, the first ferromagnetic metal component is arranged inside the first coil housing, and an insulating waterproof material is cast outside the first coil, the first coil housing and the first ferromagnetic metal component;

[0019] The second coil housing is a hollow tubular structure. The second coil is wound around the outer side of the second coil housing. The second ferromagnetic metal component is arranged inside the second coil housing. An insulating waterproof material is cast outside the second coil, the second coil housing, and the second ferromagnetic metal component.

[0020] The present utility model also discloses a control circuit for controlling a double-static 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 open or close. 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 double-control switch includes a third switch and a fourth switch. The second double-control switch can simultaneously control the third switch and the fourth switch to open or close. 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 preferred 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 first time-delay relay is connected to the wire between the first switch and the first end of the coil module, and the other end of the first time-delay relay is connected to the wire between the second switch and the second end of the coil module; one end of the second time-delay relay is connected to the wire between the third switch and the first end of the coil module, and the other end of the second time-delay relay is connected to the wire between the fourth switch and the second end of the coil module.

[0026] The first normally-closed contact is disposed on the wire connecting the first switch and the rectifier, and the second normally-closed contact is disposed on the wire connecting the second switch and the rectifier; the first normally-closed contact 26 is electrically connected to the first time-delay relay. When the first double-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 26 to open; the second normally-closed contact 27 is electrically connected to the second time-delay relay. When the second double-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 27 to open;

[0027] The first end of the third normally-closed contact is connected to the positive pole of the rectifier, and the second end of the third normally-closed contact is connected to the positive pole of the capacitor; the first end of the fourth normally-closed contact is connected to the negative pole of the rectifier, and the second end of the fourth normally-closed contact is connected to the negative pole of the capacitor; the first end of the first normally-open contact is connected to the positive pole 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 pole 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 the main power supply. The third normally-closed contact, the fourth normally-closed contact, the first normally-open contact, and the second normally-open contact are respectively electrically connected to the AC relay. When the main power supply supplies power normally, 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 main power supply is powered off, the AC relay controls the third normally-closed contact and the fourth normally-closed contact to open, and the first normally-open contact and the second normally-open contact to close.

[0030] Advantageous effects: The double-static self-holding electromagnetic contactor disclosed by 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 that the coil generates heat due to long-term energization, and saving electric energy at the same time. In another aspect of the present utility model, by disposing the switch control device in a porcelain bottle and filling the porcelain bottle with an inert gas, while increasing the closing and opening speeds of the first metal contact and the second metal contact, reducing the generation of electric sparks, and improving the use safety. In another aspect of the present utility model, by providing a housing outside the coil, the entire device can be in a closed space, which can be used for underwater operations and has excellent waterproof performance. In another aspect of the present utility model, through the setting of the control circuit of the double-static self-holding electromagnetic contactor, the control of the power supply to the coil can be realized, and when powered off, the metal contacts in the switch control device can be separated by the capacitor, ensuring the safety when the main power supply is powered on again. Description of the Drawings

[0031] Figure 1 This is a schematic structural diagram of the closed state of the double-static self-holding electromagnetic contactor of the present utility model.

[0032] Figure 2 This is a schematic structural diagram of the open state of the double-static self-holding electromagnetic contactor of the present utility model.

[0033] Figure 3 This is a schematic cross-sectional structural diagram of the double-static self-holding electromagnetic contactor of the present utility model.

[0034] Figure 4 This is a schematic diagram of the control circuit of the double-static self-holding electromagnetic contactor of the present utility model

[0035] In the figure: 1. First coil, 2. Second coil, 3. First ferromagnetic metal component, 4. Second ferromagnetic metal component, 5. First permanent magnet, 6. Second permanent magnet, 7. First insulating connecting plate, 8. Second insulating connecting plate, 9. First metal contact, 10. Second metal contact, 11. Insulating housing, 12. Air injection hole, 13. First coil housing, 14. Second coil housing, 15. First elastic reed, 16. Second elastic reed, 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. First diode, 34. Second diode. Specific embodiments

[0036] 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 understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the 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, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. 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, which may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. 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.

[0038] As Figures 1 to 3 shown, the present utility model discloses a double-static self-holding electromagnetic contactor, which includes a first coil 1, a second coil 2, a first ferromagnetic metal component 3, a second ferromagnetic metal component 4, a first permanent magnet 5, a second permanent magnet 6, and a switch control device.

[0039] The first ferromagnetic metal component 3 is disposed in the through hole of the first coil 1. By energizing the first coil 1, the first ferromagnetic metal component 3 generates magnetism. By changing the direction of the current flowing into the first coil 1, the magnetic pole of the first ferromagnetic metal component is adjusted; the second ferromagnetic metal component 4 is disposed in the through hole of the second coil 2. By energizing the second coil 2, the second ferromagnetic metal component 4 generates magnetism. By changing the direction of the current flowing into the second coil 2, the magnetic pole of the second ferromagnetic metal component is adjusted; the second coil 2 is disposed on one side of the first coil 1, and there is a certain distance between the second coil 2 and the first coil 1. The through holes of the first coil 1 and the second coil 2 are oppositely disposed, so that the axis of the first coil 1 is parallel or coincident with the axis of the second coil 2.

[0040] The switch control device is disposed between the first coil 1 and the second coil 2. The switch control device includes two sets of relatively disposed contact pieces, a first permanent magnet, and a second permanent magnet. The contact pieces are respectively a first contact piece and a second contact piece. The first contact piece is disposed on the side close to the first coil, and the second contact piece is disposed on the side close to the second coil. A first permanent magnet 5 is provided on the first contact piece, and a second permanent magnet 6 is provided on the second contact piece. The magnetic poles of the adjacent sides of the first permanent magnet 5 and the second permanent magnet 6 are opposite. For example, when the magnetic pole of one end of the first permanent magnet 5 close to the second permanent magnet 6 is an N pole, the magnetic pole of one end of the second permanent magnet 6 close to the first permanent magnet 5 is an S pole.

[0041] Preferably, the first ferromagnetic metal component 3 and the second ferromagnetic metal component 4 include iron, nickel, cobalt, gadolinium, dysprosium, and alloys, such as components formed of steel. Preferably, the ferromagnetic metal component is a pure iron component.

[0042] Preferably, the switch control device further includes a first elastic reed 15 and a second elastic reed 16. The first contact piece is disposed at one end in the length direction of the first elastic reed 15, and the second contact piece is disposed at one end in the length direction of the second elastic reed 16. The other ends in the length direction of the first elastic reed 15 and the second elastic reed 16 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 15 and the second elastic reed 16 are electrically connected to power on the double-static self-holding electromagnetic contactor.

[0043] 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.

[0044] As a preferred technical solution of the present utility model, the magnetic properties of the first permanent magnet 5 and the second permanent magnet 6 are the same.

[0045] In the above technical solution, the first ferromagnetic metal component and the second ferromagnetic metal component are in a static state during operation. In the process of power-on of the above double-static self-holding electromagnetic contactor, as Figure 1 shown, taking the magnetic pole of the first permanent magnet 5 close to one end of the first ferromagnetic metal component 3 as the S pole as an example, by passing a current through the first coil 1, the magnetic pole of the first ferromagnetic metal component 3 close to the first permanent magnet 5 is the S pole. Since the end of the first permanent magnet 5 close to the first ferromagnetic metal component 3 is also the S pole, like poles repel each other, causing the first permanent magnet 5 to drive the first contact piece to move towards the second contact piece. Similarly, by passing a current through the second coil 2, the magnetic pole of the second ferromagnetic metal component 4 close to one end of the second permanent magnet 6 is the N pole. Since the end of the second permanent magnet 6 close to the second ferromagnetic metal component 4 is also the N pole, like poles repel each other, causing the second permanent magnet 6 to drive the second contact piece to move towards the second contact piece. Eventually, the first contact piece and the second contact piece are in contact. At this time, since the magnetic poles on the adjacent sides of the first permanent magnet 5 and the second permanent magnet 6 are opposite, unlike poles attract each other, the first contact piece and the second contact piece are always in contact. Without passing current through the first coil 1 and the second coil 2, the first contact piece and the second contact piece can be maintained in a contact state all the time, achieving the purpose of power-on. Through the above technical solution, it is not necessary to continuously pass current through the first coil 1 and the second coil 2 to maintain the magnetism of the first ferromagnetic metal component and the second ferromagnetic metal component. It only needs to pass current through the first coil 1 and the second coil 2 for a very short time, about 0.2 s, to complete the power-on step, solving the technical problem that continuous power-on easily causes the coil to heat up and burn out, and greatly reducing power consumption.

[0046] When power-off is required, pass current through the first coil 1 and the second coil 2, so that the magnetic pole of the first ferromagnetic metal component 3 close to one end of the first permanent magnet 5 is the N pole, and the end of the second ferromagnetic metal component 4 close to the second permanent magnet 6 is the S pole. Since the magnetic poles on the adjacent sides of the first ferromagnetic metal component and the first permanent magnet 5 are opposite, the first magnetic component generates a suction force F1 on the first permanent magnet 5; when the first contact piece and the second contact piece are in contact, the suction force of the second permanent magnet 6 on the first permanent magnet 5 is F2; the first elastic reed 15 exerts a force F3 on the first contact piece towards the direction of the second permanent magnet 6; when F1 > F2 + F3, the first permanent magnet 5 is adsorbed onto the first ferromagnetic metal component.

[0047] Similarly, the magnetic poles of the second ferromagnetic metal component adjacent to the second permanent magnet 6 are opposite, and the second magnetic component generates a suction force F1' on the second permanent magnet 6; when the first contact piece and the second contact piece come into contact, the suction force of the first permanent magnet 5 on the second permanent magnet 6 is F2'; the second elastic reed 16 exerts a force F3' on the second contact piece in the direction towards the first permanent magnet 5; when F1' > F2' + F3', the second permanent magnet 6 is adsorbed onto the second ferromagnetic metal component.

[0048] Through the above steps, the separation of the first contact piece and the second contact piece is achieved to cut off the power supply. At this time, no current needs to be applied to the first coil 1 and the second coil 2. In this state, the first permanent magnet 5 is adsorbed onto the first ferromagnetic metal component, and the second permanent magnet 6 is adsorbed onto the second ferromagnetic metal component. There is a certain distance between the first permanent magnet 5 and the second permanent magnet 6. In this state, the suction force of the first permanent magnet 5 on the first ferromagnetic metal component is F4; the suction force of the second permanent magnet 6 on the first permanent magnet 5 is F5, and the first elastic reed 15 exerts a force F6 on the first permanent magnet in the direction towards the second permanent magnet 6, so that F4 > F5 + F6, ensuring that the first permanent magnet 5 can be stably adsorbed onto the first ferromagnetic metal component in this state.

[0049] Similarly, the suction force of the second permanent magnet 6 on the second ferromagnetic metal component is F4'; the suction force of the second permanent magnet 6 on the first permanent magnet 5 is F5', and the second elastic reed 16 exerts a force F6' on the second permanent magnet in the direction towards the first permanent magnet 5, so that F4' > F5' + F6', ensuring that the first permanent magnet 5 can be stably adsorbed onto the first ferromagnetic metal component in this state. The magnitudes of the above F4 and F4' can be adjusted by adjusting the distance between the first permanent magnet 5 and the second permanent magnet 6, F5 and F5' can be adjusted by adjusting the magnetic magnitudes of the first permanent magnet 5 and the second permanent magnet 6, and F6 and F6' can be adjusted by adjusting the elastic magnitudes of the first elastic reed 15 and the second elastic reed 16. Adjust the elastic magnitude of the second elastic reed 16 to adjust F6'.

[0050] It can be seen that those skilled in the art can achieve the basic conditions for the normal and stable operation of the above embodiments of the present invention through the above adjustments.

[0051] As a preferred technical solution of the present invention, the first contact piece includes a first insulating connecting plate 7 and a first metal contact 9, and the second contact piece includes a second insulating connecting plate 8 and a second metal contact 10.

[0052] The first insulating connecting plate 7 and the second insulating connecting plate 8 are arranged relatively parallel. The first insulating connecting plate 7 is located on the side close to the first coil 1, and the second insulating connecting plate 8 is located on the side close to the second coil 2. Both the first insulating connecting plate 7 and the second insulating connecting plate 8 are plate-like structures made of insulating materials.

[0053] The first metal contact 9 is disposed on the end surface of the first insulating connection plate 7 close to the second coil 2. One end of the first elastic spring piece 15 in the length direction is connected to the first metal contact 9. By providing the first elastic spring piece 15, the first insulating connection plate 7 and the first metal contact 9 are suspended in the space between the first coil 1 and the second coil 2. The first permanent magnet 5 is disposed on the end surface of the first insulating connection plate 7 close to the first coil 1.

[0054] The second metal contact 10 is disposed on the end surface of the second insulating connection plate 8 close to the first coil 1. One end of the second elastic spring piece 16 in the length direction is connected to the second metal contact 10. By providing the second elastic spring piece 16, the second insulating connection plate 8 and the second metal contact 10 are suspended in the space between the first coil 1 and the second coil 2. The second permanent magnet 6 is disposed on the end surface of the second insulating connection plate 8 close to the second coil 2.

[0055] Preferably, both the first metal contact 9 and the second metal contact 10 are made of conductive metal. Preferably, the metal contact material is silver.

[0056] In the above technical solution, when the switch control device performs the power-on step, the first permanent magnet 5 is subjected to the repulsive force exerted by the first ferromagnetic metal component, driving the first insulating connection plate 7 to move towards the second insulating connection plate 8. Similarly, the second insulating connection plate 8 moves towards the first insulating connection plate 7, causing the first metal contact 9 and the second metal contact 10 to come into contact, realizing the conduction of the first elastic spring piece 15 and the second elastic spring piece 16. Due to the magnetic attraction force between the first permanent magnet 5 and the second permanent magnet 6, it is not necessary to continue passing current through the first coil 1 and the second coil 2, and the first metal contact 9 and the second metal contact 10 can be kept in a contact state continuously. When the switch control device performs the power-off step, current is passed through the first coil 1 and the second coil 2, causing the first ferromagnetic metal component 3 to generate an attractive force on the first permanent magnet 5 and the second ferromagnetic metal component to generate an attractive force on the second permanent magnet 6, causing the first permanent magnet 5 to be adsorbed on the first ferromagnetic metal component 3 and the second permanent magnet 6 to be adsorbed on the second ferromagnetic metal component 4, separating the first metal contact 9 and the second metal contact 10.

[0057] As a preferred technical solution of the present utility model, it further includes an insulating housing 11. The insulating housing 11 is a sealed housing with an accommodation space inside. The switch control device is encapsulated in the insulating housing 11. One end of the first elastic reed 15 in the length direction away from the first insulating connecting plate 7 passes through the insulating connecting housing 11 and is located outside the insulating connecting housing 11. A support for fixing the first elastic reed 15 is provided outside the insulating connecting housing, so that the first elastic reed 15 can support the first insulating connecting plate 7 and make it suspended in the insulating housing 11. One end of the second elastic reed 16 in the length direction away from the second insulating connecting plate 8 is fixed to the insulating connecting housing 11 and is located outside the insulating connecting housing 11. A support for fixing the second elastic reed 16 is provided outside the insulating connecting housing, so that the second elastic reed 16 can support the second insulating connecting plate 8 and make it suspended in the insulating housing 11. Preferably, the material of the insulating housing 11 can be selected from insulating materials such as ceramics, rubber, glass, etc. Preferably, the insulating housing 11 is a porcelain bottle.

[0058] The present utility model is applied to high-voltage and large-current scenarios. In this application scenario, when the first metal contact 9 and the second metal contact 10 are in contact instantaneously, electric sparks will be generated, which will interfere with surrounding electronic devices and circuits and even cause fires. By arranging the switch control device in the insulating housing 11, the technical problem of electric sparks interfering with surrounding electronic devices or circuits is solved.

[0059] As a preferred technical solution of the present utility model, an air injection hole 12 is provided on the side wall of the insulating housing 11. The insulating housing 11 is evacuated through the air injection hole 12, or an inert gas is injected into the insulating housing 11, and the air injection hole 12 is sealed with a sealant. Through the above settings, the electric sparks generated when the first metal contact 9 and the second metal contact 10 are in contact can be avoided. The inert gas can be selected from helium, neon, argon, etc.

[0060] As a preferred technical solution of the present utility model, at least one group of the first metal contact 9 on the first insulating connecting plate 7 and the second metal contact 10 on the second insulating connecting plate 8 are provided. The first metal contact 9 and the second metal contact 10 are arranged correspondingly and have the same number, as shown in the figure. Figure 2As shown, the first metal contacts 9 on the first insulating connection plate 7 and the second metal contacts 10 on the second insulating connection plate 8 are arranged in a one-to-one correspondence up and down, so that each group of first metal contacts 9 is in contact with each group of second metal contacts 10 in the powered-on state. The number of the first elastic spring pieces 15 is the same as the number of the first metal contacts 9, so that each end of each group of first elastic spring pieces 15 is provided with a first metal contact 9. The number of the second elastic spring pieces 16 is the same as the number of the second metal contacts 10, so that each end of each group of first elastic spring pieces 15 is provided with a first metal contact 9. Two adjacent metal contacts on the same insulating metal connection plate are arranged at intervals. Through the above arrangement, the switch device can control multiple groups of circuits simultaneously.

[0061] Preferably, the number of the first metal contacts 9 and the second metal contacts 10 is four groups each.

[0062] The number of the first permanent magnets 5 and the second permanent magnets 6 can be only one group. Preferably, to improve the stability of the switch control device, several groups of first permanent magnets 5 are provided on the first insulating connection plate 7 and are evenly spaced along the length direction of the first insulating connection plate 7; several groups of second permanent magnets 6 are provided on the second insulating connection plate 8 and are evenly spaced along the length direction of the second insulating connection plate 8. Preferably, the number of the first permanent magnets 5 is the same as the number of the first metal contacts 9, and the first permanent magnets 5 and the first metal contacts 9 are correspondingly arranged on the two side end faces of the first insulating plate. Above each group of first metal contacts 9, a group of first permanent magnets 5 is correspondingly provided; the number of the second permanent magnets 6 is the same as the number of the second metal contacts 10, and the second permanent magnets 6 and the second metal contacts 10 are correspondingly arranged on the two side end faces of the second insulating plate. Below each group of second metal contacts 10, a group of second permanent magnets 6 is correspondingly provided.

[0063] As a preferred technical solution of the present utility model, it further includes a first coil housing 13 and a second coil housing 14 made of insulating materials. The first coil housing 13 is a hollow tubular structure. The first coil 1 is wound around the outer side of the first coil housing 13. The first ferromagnetic metal component 3 is arranged inside the first coil housing 13. The first coil 1, the first coil housing 13, and the first ferromagnetic metal component 3 are poured with insulating waterproof materials.

[0064] The second coil housing 14 is a hollow tubular structure. The second coil 2 is wound around the outer side of the second coil housing 14. The second ferromagnetic metal component 4 is arranged inside the second coil housing 14. The second coil 2, the second coil housing 14, and the second ferromagnetic metal component 4 are poured with insulating waterproof materials.

[0065] Preferably, the insulating waterproof material can be selected from materials such as rubber, plastic, and epoxy resin.

[0066] Before pouring, first wind the coil around the outside of the coil housing, then place the ferromagnetic metal part inside the coil housing, and then perform the pouring process.

[0067] Through the above structural design, the first coil, the second coil, the first ferromagnetic part, and the second ferromagnetic part are not in contact with air and water, achieving the purpose of rust prevention. In addition, when working underwater, it realizes the waterproof function, enabling the double static self-holding electromagnetic contactor disclosed in the present utility model to work underwater.

[0068] The present utility model also discloses a control circuit for the above double static 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.

[0069] The power supply module 17 includes an AC power supply and a rectifier 19. The rectifier 19 is connected to the AC power supply and is used to convert alternating current into direct current.

[0070] 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; the second switch 21 is respectively connected to the rectifier 19 and the second end of the coil module. 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 close, the rectifier 19 supplies current to the coil module, causing the coil module to work and generate magnetism. When the first double-control switch is controlled to open, the rectifier 19 stops supplying current to the coil module 18, causing the coil module not to generate magnetism.

[0071] The coil module 18 includes a first coil 1 and a second coil 2. The first coil 1 and the second coil 2 are arranged in parallel. By setting the winding directions of the first coil 1 and the second coil 2 to be different, the magnetic poles of the first ferromagnetic metal and the second ferromagnetic metal are opposite.

[0072] 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.

[0073] 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.

[0074] When controlling the first double-control switch to be closed, make the lower end of the first ferromagnetic metal component 3 have the same magnetic pole as the upper end of the first permanent magnet 5, and the upper end of the second ferromagnetic metal component 4 have the same magnetic pole as the lower end of the first permanent magnet 6, so that the first permanent magnet 5 and the second permanent magnet 6 are attracted to each other and close, realizing the contact between the first metal contact 9 and the second metal contact 10.

[0075] When controlling the second double-control switch to be closed, make the lower end of the first ferromagnetic metal component 3 have opposite magnetic poles to the upper end of the first permanent magnet 5, and the upper end of the second ferromagnetic metal component 4 have opposite magnetic poles to the lower end of the first permanent magnet 6, so that the first ferromagnetic metal component 3 generates an attractive force on the first permanent magnet 5, and the second ferromagnetic metal component 4 generates an attractive force on the first permanent magnet 5, realizing the separation between the first metal contact 9 and the second metal contact 10.

[0076] 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 can complete the power transmission function with a power-on time of 0.2 s. The switch can automatically rebound and open after being pressed manually, avoiding the situation where the first double-control switch and the second double-control switch are closed simultaneously because the user forgets to turn off the switch, and also avoiding the situation of continuous power supply and power loss caused by the user forgetting to turn off the switch.

[0077] Preferably, the control circuit of the double-static 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.

[0078] Preferably, the control circuit of the double-static 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 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.

[0079] The first delay relay 31 is used to control the first normally closed contact 26. The first normally closed contact 26 is electrically connected to the first delay relay 31. When the first double - control switch is closed and the current delivered by the rectifier 19 to the first - end direction of the coil module reaches the preset time of the first delay relay 31, the first delay relay 31 controls the first normally closed contact 26 to open. The second delay relay 32 is used to control the second normally closed contact 27. The second normally closed contact 27 is electrically connected to the second delay relay 32. When the second double - control switch is closed and the current delivered by the rectifier 19 to the second - end direction of the coil module reaches the preset time of the second delay relay 32, the second delay relay 32 controls the second normally closed contact 27 to open. Through the above settings of the first delay relay 31 and the second delay relay 32, it is possible to cut off the circuit in the case where the first double - control switch and the second double - control switch fail, prevent power loss, and further control and protect the circuit. Preferably, the preset times of the first delay relay 31 and the second delay relay 32 are set to be able to satisfy the time for the metal contacts of the double - static self - holding electromagnetic contactor to close. Since the first double - control switch and the second double - control switch are manually controlled to close, their closing times are generally longer than the time for the metal contacts of the double - static self - holding electromagnetic contactor to close. By setting the first delay relay 31 and the second delay relay 32, the waste of electric energy can be further reduced.

[0080] As a preferred technical solution of the present utility model, the control circuit of the double - static 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.

[0081] 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. 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. The first end of the first normally open contact 29 is connected to the positive pole of the capacitor, and the second end of the first normally open contact 29 is connected to the second end of the coil module; the first end of the second normally open contact 30 is connected to the negative pole of the capacitor, and the second end of the second normally open contact 30 is connected to the first end of the coil module.

[0082] The AC relay is connected to the main 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 main 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 28 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 main 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 9 is in contact with the second metal contact 10. When the power supply module supplies power again, it may cause safety accident problems. 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 supplies power to the coil module, making the lower end of the first ferromagnetic metal part 3 have the opposite magnetic pole to the upper end of the first permanent magnet 5, and the upper end of the second ferromagnetic metal part 4 have the opposite magnetic pole to the lower end of the first permanent magnet 6, so that the first ferromagnetic metal part 3 generates an attractive force on the first permanent magnet 5, and the second ferromagnetic metal part 4 generates an attractive force on the first permanent magnet 5, realizing the separation of the first metal contact 9 and the second metal contact 10, and the double-static self-holding electromagnetic contactor is in the power-off state, ensuring the use safety of the double-static self-holding electromagnetic contactor.

[0083] As a preferred technical solution of the present invention, it further includes a first diode 33 and a second diode 34. The first diode 33 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 34 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 33 and the second diode 34, the safety of the circuit can be protected.

[0084] The present invention also discloses a use 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.

[0085] When it is necessary to make the first metal contact 9 of the switch control device contact the second metal contact 10, press the first double-control switch. At this time, the first coil 1 and the second coil 2 of the coil module 18 are energized. The first ferromagnetic metal component exerts a repulsive force on the first permanent magnet 5, and the second ferromagnetic metal component exerts a repulsive force on the second permanent magnet 6, causing the first permanent magnet 5 and the second permanent magnet 6 to move relatively and contact. During this process, when the current passed into the coil module 28 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. At the moment when the first double-control switch is closed, the purpose of making the first metal contact 9 contact the second metal contact 10 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 purpose of making the first metal contact 9 contact the second metal contact 10 can be achieved when the first double-control switch is closed for about 0.2S.

[0086] When it is necessary to separate the first metal contact 9 of the switch control device from the second metal contact 10, press the second double-control switch. At this time, the first coil 1 and the second coil 2 of the coil module 18 are energized. The first ferromagnetic metal component exerts an attractive force on the first permanent magnet 5, and the second ferromagnetic metal component exerts an attractive force on the second permanent magnet 6, causing the first permanent magnet 5 and the second permanent magnet 6 to separate. During this process, when the current passed into the coil module 28 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. At the moment when the second double-control switch is closed, the purpose of separating the first metal contact 9 from the second metal contact 10 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 purpose of separating the first metal contact 9 from the second metal contact 10 can be achieved when the second double-control switch is closed for about 0.2S.

[0087] 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, causing the first metal contact 9 and the second metal contact 10 to separate, ensuring the safety when the power supply module is powered on again.

[0088] The above is only a preferred specific embodiment 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. A double-static self-holding electromagnetic contactor, characterized in that, Comprising a first coil (1), a second coil (2), a first ferromagnetic metal component (3), a second ferromagnetic metal component (4), a first permanent magnet (5), a second permanent magnet (6), and a switch control device; The second coil (2) is disposed on one side of the first coil (1) with a certain distance therebetween. The first ferromagnetic metal component (3) is disposed in the through hole of the first coil (1), and the second ferromagnetic metal component (4) is disposed in the through hole of the second coil (2); The switch control device is disposed between the first coil (1) and the second coil (2), and includes two sets of oppositely disposed contact pieces, a first permanent magnet (5), and a second permanent magnet (6). The two sets of contact pieces are respectively a first contact piece and a second contact piece. The first permanent magnet (5) is disposed on the first contact piece, and the second permanent magnet (6) is disposed on the second contact piece. The magnetic poles of the adjacent sides of the first permanent magnet (5) and the second permanent magnet (6) are opposite.

2. The double-static self-holding electromagnetic contactor according to claim 1, characterized in that, The first contact piece includes a first insulating connecting plate (7) and a first metal contact (9), and the second contact piece includes a second insulating connecting plate (8) and a second metal contact (10); The first insulating connecting plate (7) and the second insulating connecting plate (8) are disposed opposite and parallel to each other. The first insulating connecting plate (7) is located on the side close to the first coil (1), and the second insulating connecting plate (8) is located on the side close to the second coil (2); The first metal contact (9) is disposed on the end surface of the first insulating connecting plate (7) on the side close to the second coil (2), and the first permanent magnet (5) is disposed on the end surface of the first insulating connecting plate (7) on the side close to the first coil (1); The second metal contact (10) is disposed on the end surface of the second insulating connecting plate (8) on the side close to the first coil (1), and the second permanent magnet (6) is disposed on the end surface of the second insulating connecting plate (8) on the side close to the second coil (2).

3. The double-static self-holding electromagnetic contactor according to claim 1, characterized in that, It further includes an insulating housing (11). The insulating housing (11) is a sealed housing with an accommodation space inside, and the switch control device is encapsulated in the insulating housing (11).

4. A double-static self-holding electromagnetic contactor according to claim 3, characterized in that, An air injection hole (12) is provided on the side wall of the insulating housing (11).

5. A double-static self-holding electromagnetic contactor according to claim 2, characterized in that, At least one set of the first metal contact (9) on the first insulating connecting plate (7) and the second metal contact (10) on the second insulating connecting plate (8) are provided. The number of the first metal contacts (9) and the second metal contacts (10) is the same and they are arranged in one-to-one correspondence.

6. A double-static self-holding electromagnetic contactor according to claim 5, characterized in that, A plurality of groups of the first permanent magnets (5) are provided on the first insulating connecting plate (7) and are evenly spaced along the length direction of the first insulating connecting plate (7); a plurality of groups of the second permanent magnets (6) are provided on the second insulating connecting plate (8) and are evenly spaced along the length direction of the second insulating connecting plate (8).

7. A double-static self-holding electromagnetic contactor according to claim 6, characterized in that, The number of the first permanent magnets (5) and the first metal contacts (9) is the same, and the first permanent magnets (5) and the first metal contacts (9) are correspondingly disposed on the two end surfaces of the first insulating plate; the number of the second permanent magnets (6) and the second metal contacts (10) is the same, and the second permanent magnets (6) and the second metal contacts (10) are correspondingly disposed on the two end surfaces of the second insulating plate.

8. A double-static self-holding electromagnetic contactor according to claim 1, characterized in that, It also includes a first coil housing (13) and a second coil housing (14). The first coil housing (13) is a hollow tubular structure. The first coil (1) is wound around the outside of the first coil housing (13). The first ferromagnetic metal component (3) is arranged inside the first coil housing (13). The first coil (1), the first coil housing (13), and the first ferromagnetic metal component (3) are externally cast with insulating waterproof materials. The second coil housing (14) is a hollow tubular structure. The second coil (2) is wound around the outside of the second coil housing (14). The second ferromagnetic metal component (4) is arranged inside the second coil housing (14). The second coil (2), the second coil housing (14), and the second ferromagnetic metal component (4) are externally cast with insulating waterproof materials.

9. A control circuit applied to the double-static 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-pole double-throw switch, and a second double-pole double-throw switch. The power supply module (17) includes an AC power supply and a rectifier (19). The rectifier (19) is connected to the AC power supply. The first double-pole double-throw switch includes a first switch (20) and a second switch (21). The first double-pole double-throw switch can simultaneously control the opening or closing of the first switch (20) and the second switch (21). The first switch (20) is respectively connected to the rectifier (19) and the first end of the coil module. The second switch (21) is respectively connected to the rectifier (19) and the second end of the coil module. The coil module (18) includes a first coil (1) and a second coil (2). The first coil (1) and the second coil (2) are connected in parallel. The second double-pole double-throw switch includes a third switch (22) and a fourth switch (23). The second double-pole double-throw switch can simultaneously control the opening or closing of the third switch (22) and the fourth switch (23). 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). 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). 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-static 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 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); 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 transported 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 transported 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 main 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 main 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, and the first normally-open contact (29) and the second normally-open contact (30) to be in the normally-open state; When the main 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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