Self-locking pressure reducing valve

Abstract

The invention belongs to the technical field of pressure reducing valves, and particularly relates to a self-locking pressure reducing valve which comprises an inlet connector, a self-locking unit, a sealing head and a pressure reducing unit, and the self-locking unit comprises a self-locking shell, a coil assembly, a soft magnetic ring, a soft magnetic rod, a plane valve element base and a plane valve element; the sealing head is fixedly connected to the end, away from the inlet connector, of the self-locking shell. The pressure reduction unit comprises a pressure reduction shell and a pressure reduction structure arranged in the pressure reduction shell, the pressure reduction shell is fixedly connected with the sealing head, an air outlet is formed in the pressure reduction shell, and the air outlet is connected with a pressure reduction air channel formed by the pressure reduction structure. The coil assembly is used for driving the plane valve element to generate displacement to open or close the valve, the locking magnetic ring enables the valve to be kept in an open or closed state, the diaphragm is used for sensing pressure changes and driving the conical valve element to stabilize the outlet pressure of the valve, and the requirement that high-pressure gas at an inlet is reduced to a certain needed outlet pressure is met. And when the inlet pressure and the flow change, the outlet pressure can be kept unchanged.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure reducing valves, and in particular relates to a self-locking pressure reducing valve. Background Art

[0002] Pressure control is an important part of satellite propulsion system. For example, in electric propulsion system, high-pressure xenon is output as low-pressure xenon to thruster, and high-pressure helium is output as low-pressure constant pressure to boost tank. Pressure reducing valves are used in these working conditions, and there are high requirements for pressure reducing valves, such as small size, light weight, high output pressure accuracy, long life, self-locking function, etc., to improve the control accuracy and reliability of propulsion system. However, due to material and structure reasons, traditional regulating valves cannot meet the above requirements. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a self-locking pressure reducing valve, which uses a coil assembly to drive a flat valve core to produce displacement, so that the valve is in an open or closed state, and uses a diaphragm to sense pressure changes and drive a conical valve core to stabilize the valve outlet pressure, thereby meeting the needs of reducing the inlet high-pressure gas to a certain required outlet pressure, and can keep the outlet pressure unchanged when the inlet pressure and flow rate change.

[0004] The present invention is implemented in this way, providing a self-locking pressure reducing valve, including an inlet joint, a self-locking unit, a sealing head and a pressure reducing unit, wherein an air inlet is arranged on the inlet joint, the self-locking unit comprises a self-locking housing and a coil assembly, a soft magnetic ring, a soft magnetic rod, a plane valve core base and a plane valve core arranged inside the self-locking housing, the coil assembly is arranged between the self-locking housing and the soft magnetic ring, the soft magnetic ring is connected to the inlet joint after extending out of the self-locking housing, the soft magnetic rod is arranged in a cavity penetrating inside the soft magnetic ring, and the soft magnetic rod has a certain movement stroke along the inner wall of the soft magnetic ring, the coil assembly controls the movement of the soft magnetic rod, the plane valve core base is fixedly arranged in a cavity penetrating inside the soft magnetic rod, a through air passage is arranged inside the plane valve core base, and one end of the plane valve core base away from the inlet joint is connected to the plane valve core;

[0005] The sealing head is fixedly connected to the end of the self-locking housing away from the inlet joint, and a through air passage is arranged in the middle of the sealing head. The soft magnetic rod moves the plane valve core so that the plane valve core is sealed and pressed against the air passage inlet of the sealing head or a certain distance away from the air passage inlet.

[0006] The decompression unit includes a decompression housing and a decompression structure arranged inside the decompression housing. The decompression housing is fixedly connected to the sealing head, and an air outlet is provided on the decompression housing, and the air outlet is connected to the decompression airway formed by the decompression structure.

[0007] Preferably, the pressure reducing structure includes a conical valve core, a secondary spring, a valve seat assembly, a diaphragm and a diaphragm displacement control assembly, one end of the secondary spring is connected to the inner wall of the pressure reducing housing close to the sealing head air channel, and the other end is connected to the conical valve core, the valve seat assembly is fixed to the inner wall of the pressure reducing housing, the secondary spring controls the conical outer wall of the conical valve core to press on the valve seat assembly, a through air channel is provided in the middle of the valve seat assembly, the valve core rod of the conical valve core away from one end of the secondary spring can movably pass through the valve seat assembly and contact the diaphragm, the edge of the diaphragm is fixedly connected to the inner wall of the pressure reducing housing, the diaphragm displacement control assembly is connected to the inside of the pressure reducing housing and contacts with the other side of the diaphragm, controls the displacement of the diaphragm, and the air outlet is provided on the pressure reducing housing between the valve seat assembly and the diaphragm.

[0008] Further preferably, the valve seat assembly includes a sealing cone and a conical valve core valve seat, the sealing cone is arranged in the conical valve core valve seat, a through hole matching the conical outer wall of the conical valve core is provided in the middle of the side of the sealing cone close to the conical valve core, a reducing through hole is provided in the middle of the conical valve core valve seat, the reducing through hole has a larger aperture on the side close to the sealing cone, and an inner wall on the side away from the sealing cone is fitted with the outer wall of the valve core stem of the conical valve core, and a plurality of air passages are provided between the large aperture section of the reducing through hole and the outer wall of the conical valve core valve seat close to the diaphragm.

[0009] Further preferably, the diaphragm displacement control assembly includes a pressure plate, a support plate, a main spring, a main spring seat and a main spring rotary sleeve. The pressure plate is fixedly pressed on the inner wall of the pressure reducing housing, the edge of the diaphragm is clamped between the pressure plate and the inner wall of the pressure reducing housing, the main spring rotary sleeve is connected to the inner wall of the pressure reducing housing, the main spring is sleeved on the side of the main spring seat close to the diaphragm, one end of the main spring is connected to the main spring seat, and the other end is connected to the recess in the middle of one side of the support plate, the protrusion in the middle of the other side of the support plate passes through the hole in the middle of the pressure plate and contacts the diaphragm, and the outer wall of the other end of the main spring seat is connected to the main spring rotary sleeve.

[0010] Further preferably, the diaphragm displacement control assembly further comprises a locking nut, which is threadedly connected to the outer wall of the main spring seat and contacts the main spring rotary sleeve.

[0011] Further preferably, the coil assembly includes a closing coil, an opening coil and a locking magnetic ring, the closing coil is sleeved on the side of the soft magnetic ring close to the planar valve core, the opening coil is sleeved on the side of the soft magnetic ring close to the inlet joint, the locking magnetic ring is sleeved on the soft magnetic ring between the closing coil and the opening coil, and the closing coil and the opening coil are connected to an external power supply through a closing coil wire and an opening coil wire, respectively.

[0012] Further preferably, a soft magnetic seat is fixedly provided on the inner wall of the soft magnetic ring, on one side close to the planar valve core, and the soft magnetic rod is limited in its moving position by the soft magnetic seat.

[0013] Further preferably, the air channel inside the planar valve core base is T-shaped, a gap communicating with the T-shaped air channel of the planar valve core base is provided between the planar valve core base and the soft magnetic seat, and the planar valve core is partially embedded in the planar valve core base.

[0014] Further preferably, a filter screen is provided at one end of the inner cavity of the soft magnetic ring close to the inlet connector.

[0015] Compared with the prior art, the present invention provides a self-locking pressure reducing valve, which has the following advantages:

[0016] 1. Apply a certain voltage to the opening coil or closing coil to displace the flat valve core, thereby achieving the effect of opening or closing the valve. The locking magnetic ring keeps the valve in an open or closed state. The diaphragm senses the change in outlet pressure and drives the conical valve core to stabilize the valve outlet pressure, thereby reducing the inlet high-pressure gas to a certain required outlet pressure and maintaining the outlet pressure unchanged when the inlet pressure and flow rate change.

[0017] 2. The valve opening depends on the stiffness of the main spring and the auxiliary spring. Under certain structure and form, the valve can obtain pressure and flow regulation capabilities by adjusting the compression of the main spring.

[0018] 3. The valve has a self-locking function, there is no risk of pressure rise at the valve outlet, and the reliability is high.

[0019] 4. The main spring is used to drive the diaphragm to produce displacement to adjust the valve outlet pressure, and the auxiliary spring is used to compress the conical valve core to adjust the opening between the conical valve core and the sealing cone. This structure has good motion rigidity and dynamic stability, so the valve has the advantages of fast response, high reliability and long life.

[0020] 5. The valve structure is integrated, light in weight and small in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an appearance diagram of the self-locking pressure reducing valve provided by the present invention;

[0022] Figure 2 A cross-sectional view of the self-locking pressure reducing valve provided by the present invention in a closed state;

[0023] Figure 3 A cross-sectional view of the self-locking pressure reducing valve provided by the present invention in an open state;

[0024] In the figure: 1-main spring seat, 2-locking nut, 3-main spring sleeve, 4-main spring, 5-pressure relief housing, 6-pressure plate, 7-support plate, 8-conical valve core seat, 9-diaphragm, 10-conical valve core, 11-auxiliary spring, 12-sealing cone, 13-sealing head, 14-plane valve core, 15-soft magnetic seat, 16-plane valve core base, 17-closing coil wire, 18-closing coil, 19-locking magnetic ring, 20-soft magnetic rod, 21-opening coil wire, 22-opening coil, 23-filter screen, 24-soft magnetic ring, 25-self-locking housing, 26-inlet connector. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0026] refer to Figure 1 , Figure 2 and Figure 3 The present invention provides a self-locking pressure reducing valve, comprising an inlet joint 26, a self-locking unit, a sealing head 13 and a pressure reducing unit, wherein the inlet joint 26 is provided with an air inlet, the self-locking unit comprises a self-locking housing 25 and a coil assembly, a soft magnetic ring 24, a soft magnetic rod 20, a plane valve core base 16 and a plane valve core 14 arranged inside the self-locking housing 25, the coil assembly is arranged between the self-locking housing 25 and the soft magnetic ring 24, the soft magnetic ring 24 is extended out of the self-locking housing 25 and connected to the inlet joint 26, the soft magnetic rod 20 is arranged in a cavity penetrating inside the soft magnetic ring 24, and the soft magnetic rod 20 has a certain movement stroke along the inner wall of the soft magnetic ring 24, the coil assembly controls the movement of the soft magnetic rod 20, the plane valve core base 16 is fixedly arranged in a cavity penetrating inside the soft magnetic rod 20, a through air passage is arranged inside the plane valve core base 16, and an end of the plane valve core base 16 away from the inlet joint 26 is connected to the plane valve core 14;

[0027] The sealing head 13 is fixedly connected to one end of the self-locking housing 25 away from the inlet connector 26. A through air passage is provided in the middle of the sealing head 13. The soft magnetic rod 20 moves the plane valve core 14 so that the plane valve core 14 is sealed and pressed against the air passage inlet of the sealing head 13 or a certain distance away from the air passage inlet.

[0028] The decompression unit includes a decompression housing 5 and a decompression structure arranged inside the decompression housing 5. The decompression housing 5 is fixedly connected to the sealing head 13, and an air outlet is provided on the decompression housing 5. The air outlet is connected to the decompression airway formed by the decompression structure.

[0029] When the self-locking pressure reducing valve provided by the present invention is used, when the pressure reducing valve needs to be in a closed state, the soft magnetic ring 24 is controlled by the coil assembly to move toward the sealing head 13, thereby driving the soft magnetic rod 20, the plane valve core base 16, and the plane valve core 14 to move toward the sealing head 13, so that the plane valve core 14 is pressed against the airway entrance of the sealing head 13, and the coil assembly keeps the valve in a closed state. In this case, even if high-pressure gas is input to the air inlet of the inlet connector 26, no gas will be discharged from the air outlet, and the pressure reducing valve is in a closed state;

[0030] When the pressure reducing valve needs to be in an open state, the soft magnetic ring 24 is controlled by the coil assembly to move away from the sealing head 13, thereby driving the soft magnetic rod 20, the plane valve core base 16, and the plane valve core 14 to move away from the sealing head 13, so that the plane valve core 14 is a certain distance away from the airway entrance, and the coil assembly keeps the valve in an open state. At this time, the pressure reducing valve is in an open state. When high-pressure gas is input into the air inlet of the inlet joint 26, the high-pressure gas passes through the airway of the soft magnetic ring 24, the soft magnetic rod 20, and the plane valve core base 16, and then passes through the airway of the sealing head 13 to enter the pressure reducing structure of the pressure reducing housing 5. After passing through the pressure reducing airway formed by the pressure reducing structure, the pressure of the high-pressure gas is reduced to the target level and discharged from the air outlet.

[0031] As a specific implementation method of the decompression structure, the decompression structure includes a conical valve core 10, a secondary spring 11, a valve seat assembly, a diaphragm 9 and a diaphragm displacement control assembly. One end of the secondary spring 11 is connected to the inner wall of the decompression housing 5 close to the air channel of the sealing head 13, and the other end is connected to the conical valve core 10. The valve seat assembly is fixed on the inner wall of the decompression housing 5. The secondary spring 11 controls the conical outer wall of the conical valve core 10 to press on the valve seat assembly. A through air channel is provided in the middle of the valve seat assembly. The valve core rod of the conical valve core 10 away from the secondary spring 11 end can movably pass through the valve seat assembly and contact the diaphragm 9. The edge of the diaphragm 9 is fixedly connected to the inner wall of the decompression housing 5. The diaphragm displacement control assembly is connected to the inside of the decompression housing 5 and contacts the other side of the diaphragm 9 to control the displacement of the diaphragm 9. The air outlet is provided on the decompression housing 5 between the valve seat assembly and the diaphragm 9.

[0032] When using the pressure reducing valve provided by the present invention, firstly, according to the use requirements of the pressure reducing valve under specific working conditions, the diaphragm displacement control component is adjusted, so that the diaphragm displacement control component drives the diaphragm 9 to produce displacement, pushes the conical valve core 10, and makes a certain gap between the conical outer wall of the conical valve core 10 and the valve seat component for gas to pass through. After adjustment, when the pressure reducing valve is in an open state, the high-pressure gas enters the pressure reducing housing 5 from the air passage of the sealing head 13, passes through the cavity between the conical valve core 10 and the pressure reducing housing 5, and then enters the air passage of the valve seat component from the gap between the conical outer wall of the conical valve core 10 and the valve seat component, and then flows into the cavity between the valve seat component and the diaphragm 9, and finally is discharged from the gas outlet according to a predetermined pressure. In this process, the diaphragm 9 senses the pressure change and drives the conical valve core 10 to stabilize the valve outlet pressure, so as to reduce the high-pressure gas at the inlet to a certain required outlet pressure, and can keep the outlet pressure unchanged when the inlet pressure and flow rate change.

[0033] As a specific implementation method of the valve seat assembly, the valve seat assembly includes a sealing cone 12 and a conical valve core valve seat 8. The sealing cone 12 is arranged in the conical valve core valve seat 8. The sealing cone 12 is close to the conical valve core 10. A through hole matching the conical outer wall of the conical valve core 10 is provided in the middle of the side, and the conical valve core valve seat 8 is provided with a reducing through hole. The side of the reducing through hole close to the sealing cone 12 has a large aperture, and the inner wall of the side away from the sealing cone 12 is in contact with the outer wall of the valve core stem of the conical valve core 10. A number of air passages are provided between the large aperture section of the reducing through hole and the outer wall of the conical valve core valve seat 8 close to the diaphragm 9.

[0034] The gap between the conical valve core 10 and the sealing cone 12, the large-diameter section of the variable-diameter through hole, and several air passages between the large-diameter section of the variable-diameter through hole and the outer wall of the conical valve core valve seat 8 close to the diaphragm 9 together form the air passage of the valve seat assembly.

[0035] As a specific implementation method of the diaphragm displacement control component, the diaphragm displacement control component includes a clamping plate 6, a support plate 7, a main spring 4, a main spring seat 1 and a main spring rotary sleeve 3. The clamping plate 6 is fixedly pressed on the inner wall of the pressure reducing housing 5, the edge of the diaphragm 9 is clamped between the clamping plate 6 and the inner wall of the pressure reducing housing 5, the main spring rotary sleeve 3 is connected to the inner wall of the pressure reducing housing 5, the main spring 4 is sleeved on the side of the main spring seat 1 close to the diaphragm 9, one end of the main spring 4 is connected to the main spring seat 1, and the other end is connected to the recess in the middle of one side of the support plate 7, the protrusion in the middle of the other side of the support plate 7 passes through the hole in the middle of the clamping plate 6 and contacts the diaphragm 9, and the outer wall of the other end of the main spring seat 1 is connected to the main spring rotary sleeve 3.

[0036] When it is necessary to adjust the position of the diaphragm 9, the main spring seat 1 is rotated to adjust the position of the main spring seat 1 in the main spring rotary sleeve 3 to adjust the compression degree of the main spring 4, so that the main spring 4 pushes the support plate 7 to move, the support plate 7 pushes the diaphragm 9 to move, and the diaphragm 9 pushes the conical valve core 10 to generate a gap between the conical outer wall of the conical valve core 10 and the valve seat assembly. According to the size of the gap, the preset outlet pressure is adjusted.

[0037] For limiting the position, as an improvement of the technical solution, the diaphragm displacement control assembly further comprises a locking nut 2 , which is threadedly connected to the outer wall of the main spring seat 1 and contacts the main spring rotary sleeve 3 .

[0038] As a specific implementation method of the coil assembly, the coil assembly includes a closing coil 18, an opening coil 22 and a locking magnetic ring 19. The closing coil 18 is sleeved on the side of the soft magnetic ring 24 close to the planar valve core 14, the opening coil 22 is sleeved on the side of the soft magnetic ring 24 close to the inlet joint 26, and the locking magnetic ring 19 is sleeved on the soft magnetic ring 24 between the closing coil 18 and the opening coil 22. The closing coil 18 and the opening coil 22 are connected to an external power supply through the closing coil wire 17 and the opening coil wire 21 respectively.

[0039] When the displacement of the planar valve core 14 is controlled by the coil assembly, if the pressure reducing valve needs to be in a closed state, the closing coil 18 is energized by an external power supply, and the closing coil 18 forms an attraction force on the soft magnetic rod 20. The soft magnetic rod 20 drives the planar valve core base 16 and the planar valve core 14 to move in a direction close to the sealing head 13. The planar valve core 14 is sealed and pressed on the airway of the sealing head 13, and the locking magnetic ring 19 keeps the valve in a closed state, thereby closing the pressure reducing valve; when the pressure reducing valve needs to be in an open state, the opening coil 22 is energized by an external power supply, and the opening coil 22 forms an attraction force on the soft magnetic rod 20. The soft magnetic rod 20 drives the planar valve core base 16 and the planar valve core 14 to move in a direction away from the sealing head 13. The planar valve core 14 leaves the airway of the sealing head 13, the pressure reducing valve opens, and the locking magnetic ring 19 keeps the valve in an open state.

[0040] In order to limit the soft magnetic rod 20 , as an improvement of the technical solution, a soft magnetic seat 15 is fixedly provided on the inner wall of the soft magnetic ring 24 , close to the side of the planar valve core 14 , and the soft magnetic rod 20 is limited in movement position by the soft magnetic seat 15 .

[0041] As a preferred setting method for the internal air channel of the planar valve core base 16 and a reasonable connection method between the planar valve core 14 and the planar valve core base 16, the air channel inside the planar valve core base 16 is T-shaped, and a gap connected to the T-shaped air channel of the planar valve core base 16 is provided between the planar valve core base 16 and the soft magnetic seat 15, and the planar valve core 14 is partially embedded in the planar valve core base 16.

[0042] In order to filter impurities in the high-pressure gas, as an improvement of the technical solution, a filter screen 23 is provided at one end of the inner cavity of the soft magnetic ring 24 close to the inlet joint 26 .

[0043] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A self-locking pressure reducing valve, characterized in that: The invention comprises an inlet joint (26), a self-locking unit, a sealing head (13) and a decompression unit. The inlet joint (26) is provided with an air inlet. The self-locking unit comprises a self-locking housing (25) and a coil assembly, a soft magnetic ring (24), a soft magnetic rod (20), a plane valve core base (16) and a plane valve core (14) arranged inside the self-locking housing (25). The coil assembly is arranged between the self-locking housing (25) and the soft magnetic ring (24). The soft magnetic ring (24) extends out of the self-locking housing (25) and is connected to the inlet joint. The soft magnetic rod (20) is arranged in a cavity that passes through the soft magnetic ring (24), and the soft magnetic rod (20) has a certain movement stroke along the inner wall of the soft magnetic ring (24). The coil assembly controls the movement of the soft magnetic rod (20). The plane valve core base (16) is fixedly arranged in the cavity that passes through the soft magnetic rod (20). The plane valve core base (16) is provided with a through air passage. One end of the plane valve core base (16) away from the inlet joint (26) is connected to the plane valve core (14); The sealing head (13) is fixedly connected to one end of the self-locking housing (25) away from the inlet connector (26), and a through air passage is provided in the middle of the sealing head (13). The soft magnetic rod (20) moves the plane valve core (14) to a distance that enables the plane valve core (14) to be sealed and pressed against the air passage entrance of the sealing head (13) or to be a certain distance away from the air passage entrance. The decompression unit comprises a decompression housing (5) and a decompression structure arranged inside the decompression housing (5); the decompression housing (5) is fixedly connected to the sealing head (13); and an air outlet is provided on the decompression housing (5); the air outlet is connected to a decompression airway formed by the decompression structure.

2. The self-locking pressure reducing valve according to claim 1, characterized in that: The decompression structure comprises a conical valve core (10), an auxiliary spring (11), a valve seat assembly, a diaphragm (9) and a diaphragm displacement control assembly. One end of the auxiliary spring (11) is connected to the inner wall of the decompression housing (5) near the air passage of the sealing head (13), and the other end is connected to the conical valve core (10). The valve seat assembly is fixed to the inner wall of the decompression housing (5). The auxiliary spring (11) controls the conical outer wall of the conical valve core (10) to press on the valve seat assembly. A through air passage is provided in the middle of the valve seat assembly. The valve core rod of the conical valve core (10) away from one end of the auxiliary spring (11) can movably pass through the valve seat assembly and contact the diaphragm (9). The edge of the diaphragm (9) is fixedly connected to the inner wall of the decompression housing (5). The diaphragm displacement control assembly is connected to the inside of the decompression housing (5) and contacts the other side of the diaphragm (9) to control the displacement of the diaphragm (9). The air outlet is provided on the decompression housing (5) between the valve seat assembly and the diaphragm (9).

3. The self-locking pressure reducing valve according to claim 2, characterized in that: The valve seat assembly comprises a sealing cone (12) and a conical valve core valve seat (8), wherein the sealing cone (12) is arranged in the conical valve core valve seat (8), and a through hole matching the conical outer wall of the conical valve core (10) is provided in the middle of the side of the sealing cone (12) close to the conical valve core (10), and a reducing through hole is provided in the middle of the conical valve core valve seat (8), wherein the reducing through hole has a larger aperture on the side close to the sealing cone (12), and the inner wall on the side away from the sealing cone (12) is in contact with the outer wall of the valve core stem of the conical valve core (10), and a plurality of air passages are provided between the large aperture section of the reducing through hole and the outer wall of the conical valve core valve seat (8) close to the diaphragm (9).

4. The self-locking pressure reducing valve according to claim 2, characterized in that: The diaphragm displacement control assembly comprises a clamping plate (6), a support plate (7), a main spring (4), a main spring seat (1) and a main spring rotary sleeve (3); the clamping plate (6) is fixedly pressed on the inner wall of the pressure reducing housing (5); the edge of the diaphragm (9) is clamped between the clamping plate (6) and the inner wall of the pressure reducing housing (5); the main spring rotary sleeve (3) is connected to the inner wall of the pressure reducing housing (5); the main spring (4) is sleeved on a side of the main spring seat (1) close to the diaphragm (9); one end of the main spring (4) is connected to the main spring seat (1), and the other end is connected to a recess in the middle of one side of the support plate (7); the protrusion in the middle of the other side of the support plate (7) passes through the hole in the middle of the clamping plate (6) and contacts the diaphragm (9); the outer wall of the other end of the main spring seat (1) is connected to the main spring rotary sleeve (3).

5. The self-locking pressure reducing valve according to claim 4, characterized in that: The diaphragm displacement control assembly also includes a locking nut (2), which is threadedly connected to the outer wall of the main spring seat (1) and is in contact with the main spring rotary sleeve (3).

6. The self-locking pressure reducing valve according to claim 1, characterized in that: The coil assembly comprises a closing coil (18), an opening coil (22) and a locking magnetic ring (19); the closing coil (18) is sleeved on a side of the soft magnetic ring (24) close to the planar valve core (14); the opening coil (22) is sleeved on a side of the soft magnetic ring (24) close to the inlet joint (26); the locking magnetic ring (19) is sleeved on the soft magnetic ring (24) between the closing coil (18) and the opening coil (22); the closing coil (18) and the opening coil (22) are connected to an external power supply via a closing coil wire (17) and an opening coil wire (21), respectively.

7. The self-locking pressure reducing valve according to claim 1, characterized in that: A soft magnetic seat (15) is fixedly provided on the inner wall of the soft magnetic ring (24) and on one side close to the planar valve core (14), and the soft magnetic rod (20) is limited in its moving position by the soft magnetic seat (15).

8. The self-locking pressure reducing valve according to claim 7, characterized in that: The air passage inside the plane valve core base (16) is T-shaped, and a gap communicating with the T-shaped air passage of the plane valve core base (16) is provided between the plane valve core base (16) and the soft magnetic base (15), and the plane valve core (14) is partially embedded in the plane valve core base (16).

9. The self-locking pressure reducing valve according to claim 1, characterized in that: A filter screen (23) is provided at one end of the inner cavity of the soft magnetic ring (24) close to the inlet joint (26).

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