A dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft

Abstract

The present invention discloses a dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft, which includes a solenoid valve body, an armature, a transmission member, an elastic member, a sealing valve, an electromagnetic drive assembly and a permanent magnet self-locking assembly; one end of the solenoid valve body is provided with a dielectric cavity, and the other end is provided with a sliding cavity. The solenoid valve body is provided with an upstream inlet and a downstream outlet communicated with the dielectric cavity; the armature is arranged in the sliding cavity and is slidably connected with its inner wall; the transmission member is arranged on the solenoid valve body, one end of the transmission member is connected to the armature, and the other end penetrates into the dielectric cavity; both the elastic member and the sealing valve are arranged in the dielectric cavity, the sealing valve is arranged opposite to the downstream outlet for contacting and sealing the downstream outlet, one end of the elastic member is connected to the transmission member, and the other end is connected to the sealing valve; both the electromagnetic drive assembly and the permanent magnet self-locking assembly are arranged in the solenoid valve body, and the permanent magnet self-locking assembly adsorbs and fixes the armature through the magnetic attraction of the permanent magnet; the electromagnetic drive assembly drives the armature to move towards or away from the downstream outlet by overcoming the magnetic attraction of the permanent magnet through electromagnetic force.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid control, and particularly relates to a medium-isolated permanent magnet self-locking solenoid valve for spacecraft. Background Art

[0002] As a fluid on-off control unit with fast response, low cost, simple principle, and good compatibility with control systems, solenoid valves are widely used in various aerospace fields such as liquid rockets, satellites, space probes, and manned spacecraft. The performance and reliability of solenoid valves directly affect the operation of the entire system and even the success or failure of the mission.

[0003] In traditional solenoid valves, a magnetic field is generated by energizing a winding coil, thereby providing a driving force for the armature to move to one side, and the reaction force for the armature to return to its original position after power-off is provided by an elastic element. When it is required to maintain the working state, the coil needs to be powered continuously for a long time. This brings two problems. Firstly, continuous power supply causes energy consumption problems. Especially for spacecraft performing deep space exploration missions, high energy consumption requirements will affect their working life and mission planning. Secondly, long-term power-on causes the coil to heat up, the resistance increases, affecting the performance of the solenoid valve. And when the heat dissipation environment is harsh, continuous heat accumulation will threaten the normal operation of the solenoid valve and even the entire system.

[0004] Therefore, in the prior art, there appears a permanent magnet self-locking solenoid valve, which can maintain the open and closed states through a permanent magnet, greatly reducing energy consumption. The invention patent publication number CN108006301A, "A Permanent Magnet Self-Locking Valve", discloses a structure of a direct-through permanent magnet self-locking valve, including an outlet pipe, a magnetic isolation ring I, a magnetic conduction ring, a magnetic isolation ring, a right skeleton, an inlet pipe, a valve core, a spring, an opening coil, a closing coil, a permanent magnet assembly, a filtering assembly, and a housing. In this solution, when the valve seals the downstream, the magnetic suction force of the permanent magnet is directly transmitted to the sealing pair, resulting in limited design margin of the permanent magnet. When designing the permanent magnet, the magnetic force cannot be too large, otherwise the sealing components are likely to be crushed. Therefore, the adaptability of this valve under different temperature and current working conditions is limited. Summary of the Invention

[0005] Aiming at the problems in the background art, the object of the present invention is to provide a medium-isolated permanent magnet self-locking solenoid valve for spacecraft, including a solenoid valve body, an armature, a transmission member, an elastic member, a sealing valve, an electromagnetic drive assembly, and a permanent magnet self-locking assembly;

[0006] One end of the solenoid valve body is provided with a medium cavity, and the other end is provided with a sliding cavity. The solenoid valve body is also provided with an upstream inlet and a downstream outlet communicating with the medium cavity;

[0007] The armature is arranged in the sliding cavity and is slidably connected to its inner wall;

[0008] The transmission member is disposed within the solenoid valve body. One end of the transmission member is connected to the armature, and the opposite end thereof penetrates into the medium chamber.

[0009] The elastic member and the sealing valve are both disposed within the medium chamber. The sealing valve is disposed opposite to the downstream outlet and is used for sealing the downstream outlet in contact. One end of the elastic member is connected to the transmission member, and the other end is connected to the sealing valve.

[0010] The electromagnetic driving assembly and the permanent magnet self-locking assembly are both disposed within the solenoid valve body. The permanent magnet self-locking assembly adsorbs and fixes the armature through the magnetic attraction of the permanent magnet. The electromagnetic driving assembly drives the armature to move toward or away from the downstream outlet against the magnetic attraction of the permanent magnet through electromagnetic force, so as to drive the sealing valve to seal or open the downstream outlet through the transmission of the transmission member and the elastic member.

[0011] Preferably, the transmission member is a transmission rod. The transmission rod penetrates and is slidably connected within the solenoid valve body, and a sliding sealing ring is sleeved on the transmission rod.

[0012] Preferably, the elastic member is a sealing spring. A first spring accommodation cavity is provided at one end of the sealing valve away from the downstream outlet. A guide post is provided within the first spring accommodation cavity. The first end of the sealing spring is sleeved on the guide post.

[0013] A second spring accommodation cavity is provided at one end of the transmission rod facing the sealing spring and penetrates into the first spring accommodation cavity. The second end of the sealing spring is disposed within the second spring accommodation cavity, and the sealing spring is in a compressed state.

[0014] A limiting portion is provided on the transmission rod, and a limiting cooperation portion is provided on the sealing valve. The limiting portion and the limiting cooperation portion cooperate to achieve axial limitation between the transmission rod and the sealing valve.

[0015] Preferably, the limiting portion is at least one limiting lug, and the limiting lug is disposed on the outer wall of the transmission rod at the second spring accommodation cavity.

[0016] The limiting cooperation portion includes an annular assembly groove, a radial assembly groove, and a limiting groove. The annular assembly groove is disposed on the inner wall of the first spring accommodation cavity at the end close to the transmission rod. The radial assembly groove and the limiting groove are disposed on the inner wall of the first spring accommodation cavity on the side of the annular assembly groove close to the transmission rod, and the radial assembly groove communicates with the outside and the annular assembly groove, and the limiting groove communicates with the annular assembly groove.

[0017] The number and positions of the radial assembly grooves and the limit grooves correspond to those of the limit lugs. The limit lugs enter the annular assembly groove through the radial assembly grooves, and then enter the limit grooves after rotation. The limit lugs and the limit grooves cooperate to achieve axial limitation between the transmission rod and the sealing valve.

[0018] Preferably, an elastic sealing block is provided at one end of the sealing valve facing the downstream outlet, and a first sealing stop port surrounding the downstream outlet in a circle is protrudingly provided on the inner wall of the medium cavity. The first sealing stop port is pressed into the elastic sealing block to achieve sealing.

[0019] Preferably, a reset auxiliary spring in a compressed state is provided between one end of the sliding cavity away from the medium cavity and the armature.

[0020] Preferably, it includes a magnetic conductive sleeve provided in the solenoid valve body, and the armature is slidably connected in the magnetic conductive sleeve;

[0021] The electromagnetic drive assembly includes a closed coil skeleton ring, a closed coil, a permanent magnet ring, an open coil skeleton ring and an open coil. The closed coil is provided in the closed coil skeleton ring, and the open coil is provided in the open coil skeleton ring;

[0022] The permanent magnet self-locking assembly is a permanent magnet ring. The closed coil skeleton ring, the permanent magnet ring and the open coil skeleton ring are sequentially sleeved on the magnetic conductive sleeve. The closed coil skeleton ring is located at one end of the sliding cavity close to the medium cavity, the open coil skeleton ring is located at one end of the sliding cavity away from the medium cavity, and the permanent magnet ring is located on the circumferential outer side of the sliding cavity.

[0023] Preferably, the magnetic conductive sleeve includes two magnetic isolation rings and a magnetic conductive ring. The magnetic conductive ring is provided between the two magnetic isolation rings, and the magnetic conductive ring is located on the circumferential inner side of the permanent magnet ring.

[0024] Preferably, the solenoid valve body includes a main valve body and a drive valve body;

[0025] The medium cavity, the upstream inlet and the downstream outlet are all provided in the main valve body, and one end of the medium cavity facing the drive valve body is open;

[0026] The drive valve body is hollow and one end facing the main valve body is open. The sliding cavity, the armature and the electromagnetic drive assembly are all provided in the drive valve body;

[0027] It further includes a magnetic conductive bottom shell sleeve and an isolation disc. One end of the magnetic conductive bottom shell sleeve penetrates through the magnetic conductive sleeve, and a sealing disc is provided on the circumferential outer side of the other end. The sealing disc is located at the opening of the drive valve body;

[0028] The isolation disc is arranged at the opening of the medium cavity of the main valve body and is attached to the sealing disc; a sliding sleeve is arranged at one end of the isolation disc away from the main valve body, the sliding sleeve is sleeved in the magnetic conduction bottom shell sleeve, the transmission rod is sleeved in and slidably connected to the sliding sleeve, and the sliding sealing ring is arranged between the transmission rod and the inner wall of the sliding sleeve;

[0029] The driving valve body is provided with a mounting post at one end of the sliding cavity away from the main valve body, the magnetic conduction sleeve is sleeved on the mounting post at one end away from the main valve body, and a sliding cavity is formed between the end face of the mounting post close to the main valve body, the end face of the magnetic conduction bottom shell sleeve away from the main valve body, and the inner wall surface of the magnetic conduction sleeve.

[0030] Preferably, it includes a plurality of radial sealing rubber rings, which are arranged between the magnetic conduction sleeve and the mounting post, and between the magnetic conduction sleeve and the magnetic conduction bottom shell sleeve;

[0031] It includes a plurality of end face sealing rubber rings, which are arranged between the end face of the main valve body at the opening of the medium cavity and the opening end face of the driving valve body, between the sealing disc and the isolation disc, and between the isolation disc and the end face of the main valve body at the opening of the medium cavity;

[0032] A second sealing stopper is protrudingly arranged around the opening of the medium cavity on the end face of the main valve body at the opening of the medium cavity, and an elastic sealing ring corresponding to the second sealing stopper is arranged on one end of the isolation disc facing the medium cavity, and the second sealing stopper is pressed into the elastic sealing ring to achieve sealing.

[0033] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art:

[0034] 1. In the present invention, the armature is arranged in the sliding cavity, and the electromagnetic force of the electromagnetic drive assembly and the magnetic suction force of the permanent magnet of the permanent magnet self-locking assembly are indirectly transmitted to the sealing valve through the elastic member, so that there can be a large margin in the design of the electromagnetic drive assembly and the permanent magnet self-locking assembly. That is to say, the electromagnetic force and the magnetic suction force of the permanent magnet can be designed to be larger to prevent the armature from overcoming the magnetic suction force of the permanent magnet and displacing due to vibrations during operation, resulting in the loosening of the sealing valve and the sealing failure. Since the electromagnetic force and the magnetic suction force of the permanent magnet are indirectly transmitted to the sealing valve through the elastic member in the present invention, the elastic force of the elastic member is determined by its compression stroke, and the compression stroke of the elastic member is determined by the sliding stroke of the armature in the sliding cavity. Since the sliding stroke of the armature in the sliding cavity is determined, the compression stroke and the elastic force of the elastic member are determined. No matter how large the electromagnetic force of the electromagnetic drive assembly is designed, the maximum displacement of the armature remains unchanged, and the maximum elastic force of the elastic member always remains unchanged, so that the maximum sealing force of the sealing valve is always a certain value, preventing the sealing force of the sealing valve from being too large due to the excessive electromagnetic force and the magnetic suction force of the permanent magnet and crushing the structure of the sealing connection, resulting in the sealing failure. In the prior art, since the electromagnetic force and the magnetic suction force of the permanent magnet are directly transmitted to the sealing connection, the magnitudes of the electromagnetic force and the magnetic suction force of the permanent magnet are directly equal to the sealing force. Therefore, the design of the electromagnetic force and the magnetic suction force of the permanent magnet should not only prevent the armature from displacing due to vibrations, but also prevent crushing the sealing connection, making the design margin very limited.

[0035] 2. Since the electromagnetic force can be designed to be larger in the present invention, a sliding sealing ring can be arranged on the transmission rod to prevent the medium in the medium cavity from leaking to the sliding cavity through the periphery of the transmission rod, corroding components such as the armature and the electromagnetic drive assembly. Because setting the sliding sealing ring will increase the friction force when the transmission rod slides, making the moving speed of the transmission rod slower, resulting in the hysteresis of the opening and closing of the sealing valve. In the present invention, since the electromagnetic force of the electromagnetic drive assembly can be designed to be larger, the problem of the slower moving speed of the transmission rod caused by setting the sliding sealing ring can be overcome. In the prior art, due to the limited design margin of the electromagnetic force of the electromagnetic drive assembly, the problem of the slower moving speed of the transmission rod caused by setting the sliding sealing ring cannot be overcome by increasing the electromagnetic force. Because although the sliding sealing ring increases the friction force of the transmission rod, when the transmission rod moves to the closing limit position of the sealing valve, since there is no relative movement and no friction force can be generated, the increased electromagnetic force cannot be offset by the friction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following further details the specific embodiments of the present invention with reference to the drawings, where:

[0037] Figure 1 is the overall schematic diagram of the present invention;

[0038] Figure 2 is the cross-sectional view of the present invention;

[0039] Figure 3 For the present invention Figure 2 partial enlargement Figure 1 ;

[0040] Figure 4 For the present invention Figure 2 partial enlargement Figure 2 ;

[0041] Figure 5 It is a sectional view of the main valve body of the present invention;

[0042] Figure 6 It is a sectional view of the sealing valve of the present invention;

[0043] Figure 7 It is a sectional view of the isolation disc of the present invention;

[0044] Figure 8 It is a schematic diagram of the transmission rod of the present invention;

[0045] Figure 9 It is a sectional view of the magnetic conduction sleeve of the present invention;

[0046] Figure 10 It is an exploded view of the permanent magnet ring of the present invention.

[0047] Explanation of reference numerals:

[0048] 1: Main valve body; 2: Sealing valve; 3: Anti-friction pad; 4: Sealing spring; 5: End face sealing rubber ring; 6: Transmission rod; 7: Isolation disc; 8: Sliding sealing ring; 9: Armature; 10: Radial sealing rubber ring; 11: Magnetic conduction bottom shell sleeve; 12: Reset auxiliary spring; 13: Magnetic conduction sleeve; 1301: Magnetic isolation ring; 1302: Magnetic conduction ring; 14: Closed coil; 15: Closed coil skeleton ring; 16: Open coil; 17: Open coil skeleton ring; 18: Permanent magnet ring; 1801: Permanent magnet sector ring; 1802: Permanent magnet ring skeleton; 19: Driving valve body; 20: Electrical connector; 21: Medium cavity; 22: Sliding cavity; 23: Upstream inlet; 24: Downstream outlet; 25: Bolt; 26: First spring accommodation cavity; 27: Guide post; 28: Second spring accommodation cavity; 29: Limit lug; 30: Ring-shaped assembly groove; 31: Radial assembly groove; 32: Limit groove; 33: Elastic sealing block; 34: First sealing stop; 35: Sealing disc; 36: Sliding sleeve; 37: Installation post; 38: Second sealing stop; 39: Elastic sealing ring; 40: First rubber ring groove; 41: Flow guiding groove; 42: Second rubber ring groove; 43: Flow-through groove. Detailed implementation manners

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, only for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.

[0050] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0051] Referring to Figures 1 to 10 , the core of the present invention is to provide a dielectric isolation type permanent magnet self-locking solenoid valve for spacecraft, including a solenoid valve body, a transmission assembly, an electromagnetic drive assembly, and a permanent magnet self-locking assembly. The transmission assembly is driven to move by the electromagnetic force of the electromagnetic drive assembly to realize the flow and cutoff of the upstream and downstream media. After the transmission assembly moves in place, the electromagnetic drive assembly is powered off, and the position of the transmission assembly is maintained by the magnetic attraction of the permanent magnet of the permanent magnet self-locking assembly, so as to realize the self-locking and maintenance of the transmission assembly without power. This enables the use of pulsed current to excite the electromagnetic drive assembly only when performing opening and closing actions, generating less heat and consuming less energy.

[0052] One end of the solenoid valve body is provided with a medium cavity 21, and the other end is provided with a sliding cavity 22. The solenoid valve body is also provided with an upstream inlet 23 and a downstream outlet 24 communicating with the medium cavity 21. The transmission assembly, the electromagnetic drive assembly, and the permanent magnet self-locking assembly are all arranged inside the solenoid valve body.

[0053] Specifically, the solenoid valve body includes a main valve body 1 and a drive valve body 19. The main valve body 1 and the drive valve body 19 are fixedly connected by bolts 25, spring washers, and flat washers. The medium cavity 21, the upstream inlet 23, and the downstream outlet 24 are all arranged on the main valve body 1. The sliding cavity 22 is arranged inside the drive valve body 19, and one end of the medium cavity 21 facing the drive valve body 19 is open. The drive valve body 19 is hollow and one end facing the main valve body 1 is open.

[0054] An installation post 37 is provided at one end of the drive valve body 19 far from the main valve body 1. A magnetic conduction sleeve 13 is also arranged inside the drive valve body 19. One end of the magnetic conduction sleeve 13 is sleeved on the installation post 37, and the other end extends to the opening of the drive valve body 19.

[0055] It also includes a magnetic conduction bottom shell sleeve 11 and an isolation disk 7. One end of the magnetic conduction bottom shell sleeve 11 passes through the magnetic conduction sleeve 13, and a sealing disk 35 is arranged on the outer circumference of the other end. The sealing disk 35 is located at the opening of the drive valve body 19;

[0056] The isolation disc 7 is arranged at the opening of the medium cavity 21 of the main valve body 1 and is in contact with the sealing disc 35; a sliding sleeve 36 is arranged at one end of the isolation disc 7 away from the main valve body 1, and the sliding sleeve 36 is sleeved through the magnetic conduction bottom shell sleeve 11.

[0057] It further includes a static sealing assembly, which is arranged between the main valve body 1 and the driving valve body 19 to realize the sealing of the main valve body 1 and the driving valve body 19, prevent the medium in the medium cavity 21 from leaking and the medium in the external working conditions from entering the main valve body 1 and the driving valve body 19.

[0058] Specifically, the static sealing assembly includes a plurality of end face sealing rubber rings 5, a plurality of radial sealing rubber rings 10, a second sealing stop 38 and an elastic sealing ring 39. End face sealing rubber rings 5 are arranged between the end face of the main valve body 1 at the opening of the medium cavity 21 and the opening end face of the driving valve body 19, between the sealing disc 35 and the isolation disc 7, and between the isolation disc 7 and the end face of the main valve body 1 at the opening of the medium cavity 21 to prevent the medium in the medium cavity 21 from leaking to the outside and into the driving valve body 19; radial sealing rubber rings 10 are arranged between the magnetic conduction sleeve 13 and the mounting column 37 and between the magnetic conduction sleeve 13 and the magnetic conduction bottom shell sleeve 11 to prevent the medium in the external working conditions from entering the main valve body 1 and the driving valve body 19; a second sealing stop 38 is convexly arranged around the opening of the medium cavity 21 on the end face of the main valve body 1 at the opening of the medium cavity 21, and an elastic sealing ring 39 corresponding to the second sealing stop 38 is arranged at one end of the isolation disc 7 facing the medium cavity 21. The second sealing stop 38 is pressed into the elastic sealing ring 39 to achieve sealing and prevent the medium in the medium cavity 21 from leaking to the outside and into the driving valve body 19.

[0059] A sliding cavity 22 is formed among the end face of the mounting column 37 close to the main valve body 1, the end face of the magnetic conduction bottom shell sleeve 11 away from the main valve body 1 and the inner wall surface of the magnetic conduction sleeve 13.

[0060] The transmission assembly includes an armature 9, a transmission member, an elastic member and a sealing valve 2. The armature 9 is in the shape of a circular column section with threads arranged on one side. The armature 9 is arranged in the sliding cavity 22 and is slidably connected to its inner wall, that is, the armature 9 is slidably connected inside the magnetic conduction sleeve 13. The transmission member is a transmission rod 6 in this embodiment. The transmission rod 6 is sleeved through and slidably connected to the sliding sleeve 36. One end of the transmission rod 6 is threadedly connected to the armature 9, and the opposite end penetrates into the medium cavity 21. A first rubber ring groove 40 is formed on the transmission rod 6, and a sliding sealing ring 8 is sleeved on the transmission rod 6 through the first rubber ring groove 40. The sliding sealing ring 8 is arranged between the transmission rod 6 and the inner wall of the sliding sleeve 36 to realize the dynamic sealing on the circumference of the transmission rod 6 and prevent the medium in the medium cavity 21 from leaking to the sliding cavity 22 through the circumference of the transmission rod 6 to corrode components such as the armature 9 and the electromagnetic driving assembly.

[0061] The elastic member and the sealing valve 2 are both arranged in the medium chamber 21. The sealing valve 2 is arranged opposite to the downstream outlet 24 and is used for contacting and sealing the downstream outlet 24. Specifically, an elastic sealing block 33 is provided at one end of the sealing valve 2 facing the downstream outlet 24, and a first sealing stop 34 surrounding the downstream outlet 24 in a circle is protrudingly arranged on the inner wall of the medium chamber 21. The first sealing stop 34 is pressed into the elastic sealing block 33 to achieve sealing. Both the elastic sealing block 33 and the elastic sealing ring 39 are made of non-metallic elastic materials, and the sealing valve 2 is made of a metallic material. An overflow groove 43 is also provided on the sealing valve 2. When the sealing valve 2 moves in the medium chamber 21, the medium can overflow through the overflow groove 43, making the movement of the sealing valve 2 smoother.

[0062] One end of the elastic member is connected to the transmission member, and the other end is connected to the sealing valve 2. In this embodiment, the elastic member is a sealing spring 4. A first spring accommodation cavity 26 is provided at one end of the sealing valve 2 away from the downstream outlet 24. A guide post 27 is provided in the first spring accommodation cavity 26, and the first end of the sealing spring 4 is sleeved on the guide post 27.

[0063] One end of the transmission rod 6 facing the sealing spring 4 is provided with a second spring accommodation cavity 28 and penetrates into the first spring accommodation cavity 26. The second end of the sealing spring 4 is arranged in the second spring accommodation cavity 28, and the sealing spring 4 is in a compressed state.

[0064] A limiting portion is provided on the transmission rod 6, and a limiting cooperation portion is provided on the sealing valve 2. The limiting portion and the limiting cooperation portion cooperate to achieve axial limitation between the transmission rod 6 and the sealing valve 2. Specifically, the limiting portion is at least one limiting lug 29. In this embodiment, two limiting lugs 29 are provided, and the limiting lugs 29 are arranged on the outer wall of the transmission rod 6 at the position of the second spring accommodation cavity 28.

[0065] The limiting cooperation portion includes an annular assembly groove 30, a radial assembly groove 31, and a limiting groove 32. The annular assembly groove 30 is arranged on the inner wall of the first spring accommodation cavity 26 at the end close to the transmission rod 6. The radial assembly groove 31 and the limiting groove 32 are arranged on the inner wall of the first spring accommodation cavity 26 on the side of the annular assembly groove 30 close to the transmission rod 6, and the radial assembly groove 31 communicates with the outside and the annular assembly groove 30, and the limiting groove 32 communicates with the annular assembly groove 30; the number and positions of the radial assembly groove 31 and the limiting groove 32 correspond to those of the limiting lug 29.

[0066] When the transmission rod 6 is assembled with the sealing valve 2, first place the sealing spring 4 into the second spring accommodation cavity 28 of the transmission rod 6. Align the radial assembly groove 31 of the sealing valve 2 with the limiting lug 29 of the transmission rod 6. Manually press down the sealing valve 2 against the elastic force of the sealing spring 4, so that the limiting lug 29 enters the annular assembly groove 30 through the radial assembly groove 31. Then rotate the sealing valve 2 so that the limiting lug 29 is aligned with the limiting groove 32. Finally, release the downward pressure. The sealing valve 2 retreats under the action of the elastic force of the sealing spring 4, causing the limiting lug 29 to be embedded in the limiting groove 32. The limiting lug 29 and the limiting groove 32 cooperate through the elastic force of the sealing spring 4 to achieve the axial limit of the transmission rod 6 and the sealing valve 2.

[0067] Furthermore, a friction-reducing pad 3 is provided at the bottom of the first spring accommodation cavity 26. The sealing spring 4 abuts against the friction-reducing pad 3. The friction-reducing pad 3 reduces the friction between the sealing spring 4 and the first spring accommodation cavity 26, preventing the sealing spring 4 from twisting during the assembly and rotation of the sealing valve 2.

[0068] Both the electromagnetic drive assembly and the permanent magnet self-locking assembly are provided inside the solenoid valve body. The permanent magnet self-locking assembly adsorbs and fixes the armature 9 through the magnetic attraction of the permanent magnet; the electromagnetic drive assembly drives the armature 9 to move toward or away from the downstream outlet 24 against the magnetic attraction of the permanent magnet through electromagnetic force, so as to drive the sealing valve 2 to seal or open the downstream outlet 24 through the transmission of transmission parts and elastic parts.

[0069] Specifically, the electromagnetic drive assembly includes a closed coil skeleton ring 15, a closed coil 14, a permanent magnet ring 18, an open coil skeleton ring 17 and an open coil 16. The closed coil 14 is laminated and wound on the outer wall surface of the closed coil skeleton ring 15, and the open coil 16 is laminated and wound on the outer wall surface of the open coil skeleton ring 17. The lead-out ends of the closed coil 14 and the open coil 16 are respectively welded to two electrical connectors 20, and the electrical connectors 20 are arranged on the outer wall of the drive valve body 19.

[0070] The permanent magnet self-locking assembly is the permanent magnet ring 18. The closed coil skeleton ring 15, the permanent magnet ring 18 and the open coil skeleton ring 17 are sequentially sleeved on the magnetic conductive sleeve 13. The closed coil skeleton ring 15 is located at one end of the sliding cavity 22 close to the medium cavity 21, the open coil skeleton ring 17 is located at one end of the sliding cavity 22 far from the medium cavity 21, and the permanent magnet ring 18 is located on the circumferential outer side of the sliding cavity 22.

[0071] When the closed coil 14 is energized, an electromagnetic force is formed to drive the armature 9 to move downward toward the downstream outlet 24 against the magnetic suction force of the permanent magnets of the permanent magnet ring 18, so as to drive the transmission rod 6, the sealing spring 4 and the sealing valve 2 to move downward toward the downstream outlet 24, enabling the sealing valve 2 to seal the downstream outlet 24 and cut off the medium flow. The sealing spring 4 provides an axial pushing force for the sealing valve 2 to maintain the seal. When the open coil 16 is energized, an electromagnetic force is formed to drive the armature 9 to move away from the downstream outlet 24 against the magnetic suction force of the permanent magnets of the permanent magnet ring 18, so as to drive the transmission rod 6, the sealing spring 4 and the sealing valve 2 to move away from the downstream outlet 24, enabling the sealing valve 2 to open the downstream outlet 24 and allowing the medium to flow. After the closed coil 14 and the open coil 16 drive the armature 9 to move to the extreme positions on both sides by electromagnetic force, the power is cut off, and the armature 9 is adsorbed and held in place by the magnetic suction force of the permanent magnets of the permanent magnet ring 18 to maintain the sealing or opening of the downstream outlet 24 by self-locking with the sealing valve 2.

[0072] Further, the magnetic conductive sleeve 13 includes two magnetic isolation rings 1301 and one magnetic conductive ring 1302. The magnetic isolation ring 1301 is made of paramagnetic metal, and the magnetic conductive ring 1302 is made of soft magnetic material. The magnetic conductive ring 1302 is disposed between the two magnetic isolation rings 1301, and the magnetic conductive ring 1302 is located inside the circumference of the permanent magnet ring 18. The magnetic isolation ring 1301 and the magnetic conductive ring 1302 are connected by welding. The magnetic conductive sleeve 13 is further provided with a flow guiding groove 41 on the inner wall of the sliding cavity 22 formed, so that the armature 9 slides more smoothly in the sliding cavity 22. Two second rubber ring grooves 42 are respectively provided on the inner walls of the two magnetic isolation rings 1301, and the radial sealing rubber ring 10 is disposed in the second rubber ring groove 42.

[0073] Further, the permanent magnet ring 18 is composed of a plurality of permanent magnet fan rings 1802 and a permanent magnet ring skeleton 1803. The permanent magnet fan ring 1802 is a fan ring structure of a permanent magnet with a certain angular range, magnetized radially, and a plurality of permanent magnet fan rings 1802 together form the permanent magnet ring 18 with an angular range of 360°.

[0074] Further, a reset auxiliary spring 12 in a compressed state is provided between one end of the sliding cavity 22 away from the medium cavity 21 and the armature 9. Specifically, both ends of the reset auxiliary spring 12 respectively extend into the mounting post 37 and the armature 9. The reset auxiliary spring 12 can assist the closed coil 14 to drive the sealing valve 2 to seal the downstream outlet 24, and can also assist in fixing the armature 9 to prevent the armature 9 from displacement due to vibration, so as to prevent the sealing failure of the sealing valve 2.

[0075] In view of the requirements of energy conservation, high reliability, long life and adaptability to different working media for spacecraft single-unit products, the present invention makes an innovative design in structure and proposes a medium isolation type permanent magnet self-locking solenoid valve for spacecraft, which is used for the on-off control of the air supply and propellant supply pipelines in the pressurization and conveying systems of spacecraft such as launch vehicles and deep space probes.

[0076] A pulsed current is passed through the open coil 16 and the closed coil 14 to control the movement of the armature 9 in different directions, so as to drive the sealing valve 2 to separate and press the first sealing stop 34, thereby controlling the opening and closing of the valve. After the armature 9 moves to one side limit position, the open coil 16 or the closed coil 14 is powered off, and the magnetic flux emitted by the permanent magnet ring 18 maintains the armature 9 attracted on one side, so as to realize the passive holding of the valve in the open and closed states, reduce the energy consumption of the spacecraft. At the same time, since each power-on is a pulsed current with a short power supply time (<150 ms), the generated heat is very small, and time is provided for heat dissipation after power-off, avoiding the problem of rapid heat accumulation in the coil under high vacuum environment.

[0077] The present invention has the following specific advantages compared with the prior art:

[0078] 1. The electromagnetic drive assembly and the permanent magnet self-locking assembly have a large design margin

[0079] By arranging the armature 9 in the sliding cavity 22 and indirectly transmitting the electromagnetic force of the electromagnetic drive assembly and the magnetic attraction force of the permanent magnet of the permanent magnet self-locking assembly to the sealing valve 2 through the elastic member, a large design margin can be provided in the design of the electromagnetic drive assembly and the permanent magnet self-locking assembly. That is to say, the electromagnetic force and the magnetic attraction force of the permanent magnet can be designed to be larger to prevent the displacement of the armature 9 overcoming the magnetic attraction force of the permanent magnet due to vibrations and other reasons during the working process, so that the sealing valve 2 becomes loose and the sealing fails.

[0080] Because in the present invention, the electromagnetic force and the magnetic attraction force of the permanent magnet are indirectly transmitted to the sealing valve 2 through the elastic member, the elastic force of the elastic member is determined by its compression stroke, and the compression stroke of the elastic member is determined by the sliding stroke of the armature 9 in the sliding cavity 22. Since the sliding stroke of the armature 9 in the sliding cavity 22 is determined, the compression stroke and the elastic force of the elastic member are determined. No matter how large the electromagnetic force of the electromagnetic drive assembly is designed, the maximum displacement of the armature 9 remains unchanged, and the maximum elastic force of the elastic member always remains unchanged, so that the maximum sealing force of the sealing valve 2 is always a certain value, preventing the sealing force of the sealing valve 2 from being too large due to excessive electromagnetic force and magnetic attraction force of the permanent magnet and crushing the structure of the sealing connection, resulting in sealing failure. That is to say, the sealing force depends on the elastic force of the sealing spring 4 and has nothing to do with the electromagnetic force and the permanent magnet suction force. A large design margin can be provided in the design of the electromagnetic drive assembly and the permanent magnet self-locking assembly.

[0081] In the prior art, since the electromagnetic force and the magnetic attraction force of the permanent magnet are directly conducted to the sealing connection, the magnitudes of the electromagnetic force and the magnetic attraction force of the permanent magnet have a decisive effect on the sealing force. Therefore, the design of the electromagnetic force and the magnetic attraction force of the permanent magnet should not only prevent the displacement of the armature 9 due to vibration, but also prevent crushing the sealing connection, making the design margin very limited.

[0082] 2. Good sealing effect

[0083] The medium in the external working condition is prevented from entering the main valve body 1 and the driving valve body 19 through the radial sealing rubber ring 10.

[0084] Through the designs of the isolation disc 7, the transmission rod 6, the end face sealing rubber ring 5 on the magnetic conduction bottom shell sleeve 11, the sliding sealing ring 8, the elastic sealing ring 39 and the second sealing stop 38, the medium in the medium cavity 21 is completely isolated from the sliding cavity 22, avoiding the corrosion effect of the medium on components such as the open coil 16, the closed coil 14, and the permanent magnet ring 18.

[0085] In the present invention, since the electromagnetic force can be designed to be larger, a sliding sealing ring 8 can be arranged on the transmission rod 6 to prevent the medium in the medium cavity 21 from leaking into the sliding cavity 22 through the circumferential side of the transmission rod 6, so as to corrode components such as the armature 9 and the electromagnetic driving assembly. Because the arrangement of the sliding sealing ring 8 will increase the frictional force when the transmission rod 6 slides, making the moving speed of the transmission rod 6 slower, resulting in the hysteresis of the opening and closing of the sealing valve 2. In the present invention, since the electromagnetic force of the electromagnetic driving assembly can be designed to be larger, the problem that the moving speed of the transmission rod 6 becomes slower due to the arrangement of the sliding sealing ring 8 can be overcome. In the prior art, due to the limited design margin of the electromagnetic force of the electromagnetic driving assembly, the problem that the moving speed of the transmission rod 6 becomes slower due to the arrangement of the sliding sealing ring 8 cannot be overcome by increasing the electromagnetic force. Because although the sliding sealing ring 8 increases the frictional force of the transmission rod 6, when the transmission rod 6 moves to the closing limit position of the sealing valve 2, since there is no relative motion, no frictional force can be generated, and the increased electromagnetic force cannot be offset by the frictional force.

[0086] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and their equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. A dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft, characterized in that, It includes a solenoid valve body, an armature, a transmission member, an elastic member, a sealing valve, an electromagnetic drive assembly and a permanent magnet self-locking assembly; One end of the solenoid valve body is provided with a medium cavity, and the other end is provided with a sliding cavity. The solenoid valve body is also provided with an upstream inlet and a downstream outlet communicated with the medium cavity; The armature is arranged in the sliding cavity and is slidably connected with its inner wall; The transmission member is arranged in the solenoid valve body. One end of the transmission member is connected to the armature, and the opposite end penetrates into the medium cavity; The elastic member and the sealing valve are both arranged in the medium cavity. The sealing valve is arranged opposite to the downstream outlet and is used for contacting and sealing the downstream outlet. One end of the elastic member is connected to the transmission member, and the other end is connected to the sealing valve; The electromagnetic drive assembly and the permanent magnet self-locking assembly are both arranged in the solenoid valve body. The permanent magnet self-locking assembly adsorbs and fixes the armature through the magnetic attraction of the permanent magnet; the electromagnetic drive assembly drives the armature to move towards or away from the downstream outlet against the magnetic attraction of the permanent magnet through electromagnetic force, so as to drive the sealing valve to seal or open the downstream outlet through the transmission of the transmission member and the elastic member; The transmission member is a transmission rod. The transmission rod penetrates and is slidably connected in the solenoid valve body, and a sliding sealing ring is sleeved on the transmission rod; The elastic member is a sealing spring. A first spring accommodating cavity is arranged at one end of the sealing valve away from the downstream outlet. A guiding column is arranged in the first spring accommodating cavity. The first end of the sealing spring is sleeved on the guiding column; One end of the transmission rod facing the sealing spring is provided with a second spring accommodating cavity and penetrates into the first spring accommodating cavity. The second end of the sealing spring is arranged in the second spring accommodating cavity, and the sealing spring is in a compressed state; A limiting portion is arranged on the transmission rod, and a limiting cooperation portion is arranged on the sealing valve. The limiting portion and the limiting cooperation portion cooperate to realize the axial limit between the transmission rod and the sealing valve.

2. The dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft according to claim 1, characterized in that, The limiting portion is at least one limiting lug, and the limiting lug is arranged on the outer wall of the transmission rod at the second spring accommodating cavity; The limiting cooperation portion includes an annular assembly groove, a radial assembly groove and a limiting groove. The annular assembly groove is arranged on the inner wall of the first spring accommodating cavity at the end close to the transmission rod. The radial assembly groove and the limiting groove are arranged on the inner wall of the first spring accommodating cavity on the side of the annular assembly groove close to the transmission rod, and the radial assembly groove communicates with the outside and the annular assembly groove, and the limiting groove communicates with the annular assembly groove; The number and positions of the radial assembly groove and the limiting groove correspond to the limiting lugs. The limiting lugs enter the annular assembly groove through the radial assembly groove and then enter the limiting groove after rotation. The limiting lugs and the limiting groove cooperate to realize the axial limit between the transmission rod and the sealing valve.

3. The dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft according to claim 1, characterized in that, One end of the sealing valve facing the downstream outlet is provided with an elastic sealing block, and a first sealing stop port surrounding the downstream outlet in a circle is convexly arranged on the inner wall of the medium cavity, and the first sealing stop port is pressed into the elastic sealing block to achieve sealing.

4. The dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft according to claim 1, characterized in that, A reset auxiliary spring in a compressed state is arranged between one end of the sliding cavity far from the medium cavity and the armature.

5. The dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft according to claim 1, characterized in that, It includes a magnetic conductive sleeve arranged in the solenoid valve body, and the armature is slidably connected in the magnetic conductive sleeve; The electromagnetic drive assembly includes a closed coil skeleton ring, a closed coil, a permanent magnet ring, an open coil skeleton ring and an open coil. The closed coil is arranged in the closed coil skeleton ring, and the open coil is arranged in the open coil skeleton ring; The permanent magnet self-locking assembly is a permanent magnet ring. The closed coil skeleton ring, the permanent magnet ring and the open coil skeleton ring are sequentially sleeved on the magnetic conductive sleeve. The closed coil skeleton ring is located at one end of the sliding cavity close to the medium cavity, the open coil skeleton ring is located at one end of the sliding cavity far from the medium cavity, and the permanent magnet ring is located on the circumferential outer side of the sliding cavity.

6. The dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft according to claim 5, characterized in that, The magnetic conductive sleeve includes two magnetic isolation rings and a magnetic conductive ring. The magnetic conductive ring is arranged between the two magnetic isolation rings, and the magnetic conductive ring is located on the circumferential inner side of the permanent magnet ring.

7. The dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft according to claim 5, characterized in that, The solenoid valve body includes a main valve body and a driving valve body; The medium cavity, the upstream inlet and the downstream outlet are all arranged on the main valve body, and one end of the medium cavity facing the driving valve body is open; The driving valve body is hollow and one end facing the main valve body is open. The sliding cavity, the armature and the electromagnetic drive assembly are all arranged in the driving valve body; It also includes a magnetic conductive bottom shell sleeve and an isolation disc. One end of the magnetic conductive bottom shell sleeve passes through the magnetic conductive sleeve, and a sealing disc is arranged on the circumferential outer side of the other end. The sealing disc is located at the opening of the driving valve body; The isolation disc is arranged at the opening of the medium cavity of the main valve body and is attached to the sealing disc; a sliding sleeve is arranged at one end of the isolation disc far from the main valve body. The sliding sleeve passes through the magnetic conductive bottom shell sleeve, the transmission rod passes through and is slidably connected to the sliding sleeve, and a sliding sealing ring is arranged between the transmission rod and the inner wall of the sliding sleeve; The driving valve body is provided with a mounting post at one end of the sliding cavity far from the main valve body. One end of the magnetic conductive sleeve far from the main valve body is sleeved on the mounting post, and a sliding cavity is formed between the end face of the mounting post close to the main valve body, the end face of the magnetic conductive bottom shell sleeve far from the main valve body and the inner wall surface of the magnetic conductive sleeve.

8. The dielectric-isolated permanent magnet self-locking solenoid valve for spacecraft according to claim 7, characterized in that, It includes a plurality of radial sealing rubber rings arranged between the magnetic conductive sleeve and the mounting post, and between the magnetic conductive sleeve and the magnetic conductive bottom shell sleeve; It includes a plurality of end face sealing rubber rings arranged between the end face of the main valve body at the opening of the medium cavity and the opening end face of the driving valve body, between the sealing disc and the isolation disc, and between the isolation disc and the end face of the main valve body at the opening of the medium cavity; A second sealing stop is protrudingly arranged around the opening of the medium cavity on the end face of the main valve body at the opening of the medium cavity. An elastic sealing ring corresponding to the second sealing stop is arranged on one end of the isolation disc facing the medium cavity, and the second sealing stop is pressed into the elastic sealing ring to achieve sealing.

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