Double-coil permanent magnet self-locking electromagnetic valve and control method

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to a double-coil permanent magnet self-locking electromagnetic valve and a control method.The double-coil permanent magnet self-locking electromagnetic valve comprises a valve seat, a valve body and a valve element, a containing groove is formed in the outer side of the valve seat in the circumferential direction, a first coil and a second coil are stacked and wound in the containing groove from inside to outside, and a medium outlet channel is formed in the valve seat in the axial direction; one end of the valve seat is sequentially connected with a magnetic conductive ring, a magnetic isolation ring and the valve body, a magnetic isolation sleeve is arranged between the inner side of the magnetic conductive ring and the valve seat, the valve body is provided with a medium inlet channel in the axial direction, the valve element comprises an armature, a permanent magnet and a sealing part, the armature is arranged in a sliding cavity defined by the valve seat and the valve body in a sliding mode, and the permanent magnet is fixedly connected to the side, close to the valve seat, of the armature. The sealing part is fixed to the side opposite to the permanent magnet block, an elastic piece is arranged between the armature and the valve body, and the elastic piece is used for driving the armature to be close to the valve body and enabling the sealing part to abut against the medium inlet channel in a sealed mode. The valve is long in service life, fast in valve element movement response, energy-saving and consumption-reducing.

Description

Technical Field

[0001] The present invention belongs to the technical field of solenoid valves, and particularly relates to a double-coil permanent magnet self-locking solenoid valve and a control method therefor. Background Art

[0002] As a key component for controlling the on / off of fluid paths, solenoid valves are widely used in various industries such as aerospace, automotive, medical, and health. Solenoid valves can generally be classified into two categories: ordinary solenoid valves and self-locking solenoid valves according to their power supply characteristics. Among them, self-locking solenoid valves are increasingly widely used in various industries due to their advantages such as energy saving and reliability.

[0003] The commonly used double-coil permanent magnet self-locking solenoid valve currently has a similar structural form to that of a general solenoid valve. Generally, it adopts a single-coil plus permanent magnet structure. This structure uses the permanent magnet as a constant magnetic field source to form a polarized magnetic field, and the coil is energized in the forward and reverse directions to form a control magnetic field. The opening and closing and locking of the solenoid valve are realized through the coupling structure of the double magnetic path structure of the polarized magnetic field and the control magnetic field. The single-coil scheme is sensitive to the matching relationship of parameters such as the maximum air gap suction force, minimum air gap suction force, and spring force of the solenoid valve, and there are problems such as large volume, high power consumption, and difficulty in achieving matching when the difference between the maximum air gap suction force and the minimum air gap suction force requirements is large. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-coil permanent magnet self-locking solenoid valve and a control method therefor, which can meet more complex suction force requirements by controlling the electromagnetic coil, improve the service life and sealing performance of the valve, and solve the problem of difficult magnetic circuit matching when the difference between the maximum air gap suction force and the minimum air gap suction force requirements is large; the solenoid valve has a long service life, fast response of the valve core movement, and energy conservation and consumption reduction.

[0005] The above object of the invention is achieved by the following technical solutions:

[0006] A double-coil permanent magnet self-locking solenoid valve includes a valve seat, a valve body, and a valve core. A receiving groove is provided along the circumference on the outside of the valve seat. Inside the receiving groove, coil one and coil two are respectively stacked and wound from the inside to the outside. The valve seat is provided with a medium outlet channel along the axial direction. One end of the valve seat is sequentially connected to a magnetic conductive ring, a magnetic isolation ring, and the valve body. A magnetic isolation sleeve is provided between the inner side of the magnetic conductive ring and the valve seat. The valve body is provided with a medium inlet channel along the axial direction. The valve body includes an armature, a permanent magnet block, and a sealing portion. The armature slides in a sliding cavity formed by the valve seat and the valve body. The permanent magnet block is fixedly connected to the side of the armature close to the valve seat. The sealing portion is fixedly connected to the side opposite to the permanent magnet block. An elastic member is provided between the armature and the valve body. The elastic member is used to drive the armature and the valve body to approach each other and make the sealing portion seal against the medium inlet channel.

[0007] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein the sealing part includes a sealing gasket, a groove is provided at one end of the middle part of the armature close to the valve body, the sealing gasket is embedded in the groove, the sealing gasket corresponds to the medium inlet channel, and the end face of the sealing gasket protrudes from the end face of the armature on the same side.

[0008] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein an annular installation groove is provided on the side of the armature close to the valve body along the circumferential direction, and the elastic member is arranged in the installation groove.

[0009] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein the elastic member is a tension spring, one end of the tension spring is hung on the armature, and the other end of the tension spring is hung on the valve body.

[0010] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein a blind hole opposite to the medium outlet channel is provided on one side of the center of the armature close to the valve seat, and side discharge holes communicating the installation groove and the blind hole are provided on the armature along the radial direction.

[0011] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein 2-6 side discharge holes are evenly distributed along the center of the armature.

[0012] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein the permanent magnet block is annular and is coaxially arranged with the valve body.

[0013] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein the outer side of the valve seat is fixedly connected with the housing along the circumferential direction.

[0014] The above-mentioned double-coil permanent magnet self-locking solenoid valve, wherein a filter screen is provided on the medium inlet channel.

[0015] The present invention discloses a control method for a double-coil permanent magnet self-locking solenoid valve, comprising the following steps:

[0016] When the first coil is energized to generate an electromagnetic force, the armature overcomes the pulling force of the elastic member under the action of the electromagnetic force, the permanent magnet block is attracted to the valve seat, and the sealing part is separated from the valve body;

[0017] When the first coil is de-energized, the attracting force between the permanent magnet block and the valve seat overcomes the pulling force of the elastic member to maintain the separation of the sealing part from the valve body;

[0018] When the second coil is energized to generate an electromagnetic force, the armature overcomes the suction force between the permanent magnet block and the valve seat under the action of the electromagnetic force and the pulling force of the elastic member, the armature moves towards the valve body, and the sealing part approaches the valve body and seals against the medium inlet channel;

[0019] When the second coil is de-energized, the pulling force generated by the elastic member overcomes the magnetic suction force between the permanent magnet block and the valve seat, and the sealing part on the armature maintains a sealed contact state with the medium inlet channel on the valve body.

[0020] In summary, the beneficial technical effects of the present invention are as follows:

[0021] By providing two superimposed electromagnetic coils and permanent magnetic blocks, the present invention can meet complex suction requirements by controlling the electromagnetic coils, and solves the problem of difficult magnetic circuit matching when the difference between the maximum air-gap suction and the minimum air-gap suction requirements is large.

[0022] By controlling the opening and closing of the magnetic core by Coil 1 and Coil 2 respectively, the solenoid valve can be opened or closed instantaneously when Coil 1 and Coil 2 are energized. After power-off, the opening and closing states of the magnetic core remain unchanged, which is applicable to working conditions that require long-term opening or closing states, saves energy and reduces consumption, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a sectional view of the sealing state of the valve core and the valve body of the present invention;

[0024] Figure 2 is a sectional view of the separated state of the valve core and the valve body of the present invention;

[0025] Figure 3 is Figure 2 an enlarged view of Part A of

[0026] As shown in the figure, 1. valve seat; 11. accommodating groove; 12. Coil 1; 13. Coil 2; 14. medium outlet channel; 2. valve body; 21. medium inlet channel; 211. filter screen; 3. valve core; 31. armature; 311. mounting groove; 312. blind hole; 313. side discharge hole; 32. permanent magnetic block; 33. sealing part; 331. sealing gasket; 332. groove; 333. stepped groove; 4. magnetic conduction ring; 5. magnetic isolation ring; 6. magnetic isolation sleeve; 7. sliding cavity; 8. elastic part; 9. housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further elaborates on the present invention in conjunction with the attached Figures 1-3 drawings.

[0028] A double-coil permanent magnet self-locking solenoid valve, comprising a valve seat 1, a valve body 2 and a valve core 3. A receiving groove 11 is provided on the outer side of the valve seat 1 along the circumferential direction. Inside the receiving groove 11, a coil one 12 and a coil two 13 are stacked and wound from the inside to the outside. The valve seat 1 is provided with a medium outlet channel 14 along the axial direction. One end of the valve seat 1 is sequentially connected to a magnetic conducting ring 4, a magnetic isolating ring 5 and the valve body 2. A magnetic isolating sleeve 6 is provided between the inner side of the magnetic conducting ring 4 and the valve seat 1. The valve body 2 is provided with a medium inlet channel 21 along the axial direction. The valve body 2 comprises an armature 31, a permanent magnet block 32 and a sealing part 33. The armature 31 is slidably arranged in a sliding cavity 7 formed by the valve seat 1 and the valve body 2. The permanent magnet block 32 is fixedly connected to the side of the armature 31 close to the valve seat 1. The sealing part 33 is fixed on the side opposite to the permanent magnet block 32. An elastic member 8 is provided between the armature 31 and the valve body 2. The elastic member 8 is used to drive the armature 31 and the valve body 2 to approach each other, and make the sealing part 33 seal against the medium inlet channel 21.

[0029] As Figure 2 , 3 shown, the sealing part 33 comprises a sealing gasket 331. A groove 332 is provided at one end of the middle part of the armature 31 close to the valve body 2. The sealing gasket 331 is embedded in the groove 332. The sealing gasket 331 corresponds to the medium inlet channel 21. The end face of the sealing gasket 331 protrudes from the end face of the armature 31 on the same side, so that the sealing gasket 331 can better seal against the medium inlet channel 21.

[0030] A stepped groove 333 is provided along the circumferential direction on the outer edge of the end face of the armature 31 on the same side as the sealing gasket 331. By providing the annular stepped groove 333, it is convenient for the sealing gasket 331 to better seal against the medium inlet channel 21 on the valve body 2. At the same time, when the valve core 3 is opened, the medium can flow smoothly through the space between the stepped groove 333 and the valve body 2.

[0031] An annular installation groove 311 is provided along the circumferential direction on the side of the armature 31 close to the valve body 2. The elastic member 8 is arranged in the installation groove 311.

[0032] The elastic member 8 is a tension spring. One end of the tension spring is hung on the armature 31, and the other end of the tension spring is hung on the valve body 2.

[0033] A blind hole 312 opposite to the medium outlet channel 14 is provided at the center of the armature 31 on the side close to the valve seat 1. The armature 31 is provided with side discharge holes 313 communicating the installation groove 311 and the blind hole 312 along the radial direction.

[0034] 2-6 side discharge holes 313 are evenly distributed along the center of the armature 31.

[0035] The permanent magnet block 32 is annular, and the permanent magnet block 32 is coaxially arranged with the valve body 2. The permanent magnet block 32 is made of axially magnetized neodymium iron boron material.

[0036] A housing 9 is fixedly connected to the outer side of the valve seat 1 along the circumferential direction.

[0037] A filter screen 211 is provided on the medium inlet passage 21.

[0038] The present invention discloses a control method for a double - coil permanent - magnet self - locking solenoid valve, comprising the following steps:

[0039] As Figure 1 shown, the initial state of the solenoid valve is the valve - closing state, that is, the armature 31 overcomes the suction force between the permanent - magnet block 32 and the valve seat 1 under the pulling force of the elastic member 8, and the sealing portion 33 of the armature 31 is in sealing abutment with the medium inlet passage 21.

[0040] When the first coil 12 is energized to generate an electromagnetic force, the armature 31 overcomes the pulling force of the elastic member 8 under the action of the electromagnetic force, the permanent - magnet block 32 is attracted to the valve seat 1, and the sealing portion 33 is separated from the valve body 2;

[0041] When the first coil 12 is de - energized, the suction force between the permanent - magnet block 32 and the valve seat 1 overcomes the pulling force of the elastic member 8 to maintain the separation of the sealing portion 33 from the valve body 2;

[0042] When the second coil 13 is energized to generate an electromagnetic force, the armature 31 overcomes the suction force between the permanent - magnet block 32 and the valve seat 1 under the action of the electromagnetic force and the pulling force of the elastic member 8, the armature 31 moves towards the valve body 2, and the sealing portion 33 approaches the valve body 2 and is in sealing abutment with the medium inlet passage 21;

[0043] When the second coil 13 is de - energized, the pulling force generated by the elastic member 8 overcomes the magnetic suction force between the permanent - magnet block 32 and the valve seat 1, and the sealing portion 33 on the armature 31 maintains a sealed state with the medium inlet passage 21 on the valve body 2.

[0044] The first coil 12 and the second coil 13 are control coils, and by controlling, control magnetic fields of different magnitudes and directions are formed. The resultant force of the control magnetic field and the permanent - magnet block 32 controls the movement state of the valve core 3.

[0045] As Figure 2 shown, when the valve core 3 is at the minimum magnetic gap, the medium flows along the path in the dotted - line direction, that is, from the medium inlet passage 21 --- the sliding cavity 7 --- the mounting groove 311 --- the side discharge hole 313 --- the blind hole 312 --- the medium outlet passage 14.

[0046] As Figure 1 shown, when the armature 31 is at the maximum magnetic gap and the solenoid valve needs to be opened by energization, the first coil 12 is energized. At this time, the magnetic force lines generated by the first coil 12 are in the same direction as the magnetic force lines emitted from the N - pole of the permanent - magnet block 32, and a closed magnetic circuit is formed after passing through the soft - magnetic material. The suction force received by the armature 31 increases. When the suction force is greater than the pulling force of the elastic member, the armature 31 is attracted and the valve is opened, that is, as Figure 2As shown in the figure; when the coil 12 is powered off, the polarization magnetic field suction force of the permanent magnet block 32 is much greater than the pulling force of the elastic member 8, ensuring reliable opening of the valve; the permanent magnet block 32 relies on its own magnetic field to overcome the pulling force generated by the elastic member 8, so that the armature 31 maintains suction with the valve seat 1.

[0047] As Figure 2 shown, when the armature 31 is at the minimum magnetic gap and the solenoid valve needs to be closed, the coil 13 is energized. At this time, the magnetic force lines generated by the coil 13 are opposite to the magnetic force lines emitted from the N pole of the permanent magnet block 32, and form a closed magnetic circuit after passing through the soft magnetic material, canceling the magnetic force of the permanent magnet block 32 on the armature 31. The armature 31 returns to its original position under the action of the pulling force of the elastic member 8, that is, as Figure 1 shown in the figure; when the coil 13 is powered off, the polarization magnetic field suction force of the permanent magnet block 32 is much less than the pulling force of the elastic member 8, ensuring sufficient sealing force for the valve. Relying on the pulling force generated by the elastic member 8 to overcome the suction force between the permanent magnet block 32 and the valve seat 1, the armature 31 maintains the maximum magnetic gap, that is, the valve core 3 is maintained in the closed position.

[0048] When the armature 31 abuts against the valve seat 1 or the valve body 2, there is no need to energize the coil 12 or the coil 13, which can effectively reduce energy consumption. By setting the magnetic conduction ring 4, the magnetic isolation ring 5, and the magnetic isolation sleeve 6, the magnetic force during the movement of the valve core 3 can be effectively controlled, and the response time of the movement of the valve core 3 can be controlled.

[0049] The coil 12 and the coil 13 are stacked and wound in the accommodation groove 11 provided along the circumferential direction on the outer side of the valve seat 1, effectively saving the coil winding space, reducing the volume of the solenoid valve in the axial direction, and realizing miniaturization of the solenoid valve.

[0050] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A double - coil permanent - magnet self - locking solenoid valve, characterized in that, It includes a valve seat, a valve body and a valve core. A receiving groove is provided circumferentially on the outer side of the valve seat. A first coil and a second coil are stacked and wound from the inside to the outside in the receiving groove. The valve seat is provided with a medium outlet channel axially. One end of the valve seat is sequentially connected to a magnetic conductive ring, a magnetic isolation ring and the valve body. A magnetic isolation sleeve is provided between the inner side of the magnetic conductive ring and the valve seat. The valve body is provided with a medium inlet channel axially. The valve body includes an armature, a permanent magnet block and a sealing part. The armature slides in a sliding cavity formed by the valve seat and the valve body. The permanent magnet block is fixedly connected to the side of the armature close to the valve seat. The sealing part is fixedly connected to the side opposite to the permanent magnet block. An elastic member is provided between the armature and the valve body. The elastic member is used to drive the armature and the valve body to approach each other and make the sealing part seal against the medium inlet channel.

2. The double - coil permanent - magnet self - locking solenoid valve according to claim 1, characterized in that, The sealing part includes a sealing gasket. A groove is provided at one end of the middle part of the armature close to the valve body. The sealing gasket is embedded in the groove. The sealing gasket corresponds to the medium inlet channel. The end face of the sealing gasket protrudes from the end face of the same side of the armature.

3. The double - coil permanent - magnet self - locking solenoid valve according to claim 1, characterized in that, An annular installation groove is provided circumferentially on the side of the armature close to the valve body. The elastic member is arranged in the installation groove.

4. The double - coil permanent - magnet self - locking solenoid valve according to claim 3, characterized in that, The elastic member is a tension spring. One end of the tension spring is hung on the armature, and the other end of the tension spring is hung on the valve body.

5. The double - coil permanent - magnet self - locking solenoid valve according to claim 1, characterized in that, A blind hole opposite to the medium outlet channel is provided on the side of the center of the armature close to the valve seat. The armature is provided with side discharge holes radially communicating the installation groove and the blind hole.

6. The double - coil permanent - magnet self - locking solenoid valve according to claim 5, characterized in that, 2-6 side discharge holes are evenly distributed along the center of the armature.

7. The double - coil permanent - magnet self - locking solenoid valve according to claim 1, characterized in that, The permanent magnet block is annular and is coaxially arranged with the valve body.

8. The double - coil permanent - magnet self - locking solenoid valve according to claim 1, characterized in that, A housing is fixedly connected circumferentially on the outer side of the valve seat.

9. The double - coil permanent - magnet self - locking solenoid valve according to claim 1, characterized in that, A filter screen is provided on the medium inlet channel.

10. A control method for a double - coil permanent - magnet self - locking solenoid valve, characterized in that, For the double-coil permanent magnet self-locking solenoid valve according to any one of claims 1-9, it includes the following steps: The first coil is energized to generate an electromagnetic force. The armature overcomes the pulling force of the elastic member under the action of the electromagnetic force. The permanent magnet block is attracted to the valve seat, and the sealing part is separated from the valve body. The first coil is de-energized. The attracting force between the permanent magnet block and the valve seat overcomes the pulling force of the elastic member to maintain the separation of the sealing part and the valve body. The second coil is energized to generate an electromagnetic force. The armature overcomes the suction force between the permanent magnet block and the valve seat under the action of the electromagnetic force and the pulling force of the elastic member. The armature moves towards the valve body direction. The sealing part approaches the valve body and seals against the medium inlet channel. The second coil is de-energized. The pulling force generated by the elastic member overcomes the magnetic suction force between the permanent magnet block and the valve seat. The sealing part on the armature and the medium inlet channel on the valve body maintain the sealed contact state.

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