A medium supply solenoid valve for a liquid rocket engine and a control method thereof

Abstract

The application relates to a medium supply electromagnetic valve for a liquid rocket engine and a control method thereof, the medium supply electromagnetic valve comprising an electromagnet driving assembly, a shell, a pilot valve core and a main valve core, the shell being provided with an air inlet channel, an air outlet channel, an exhaust channel and a control channel which are communicated with the outside; the shell is formed with a pilot valve core mounting cavity and a main valve core mounting cavity; the main valve core is elastically mounted in the main valve core mounting cavity and can open or close the connection between the air outlet channel and the air inlet channel; the pilot valve core is elastically mounted in the pilot valve core mounting cavity; a back pressure cavity is formed between the axial one end of the main valve core and the inner side wall of the main valve core mounting cavity, an exhaust cavity is formed between the axial one end of the pilot valve core and the inner side wall of the pilot valve core mounting cavity, the back pressure cavity is communicated with the exhaust cavity through a connecting channel, and the control port at one end of the control channel is communicated with the exhaust cavity; the electromagnet driving assembly can drive the pilot valve core to axially move to open or cut off the connection between the exhaust cavity and the control channel.

Description

Technical Field

[0001] This invention relates to the field of liquid rocket engine technology, and more specifically to a medium supply solenoid valve for a liquid rocket engine and its control method. Background Technology

[0002] In liquid oxygen-methane rocket engine systems, the oxidizer supply solenoid valve plays a crucial role in the engine's start-up and shutdown phases. Its core function is to ensure that the engine completes the ignition and shutdown processes in sequence by precisely controlling the flow of oxygen, thereby guaranteeing the safe and reliable operation of the propulsion system.

[0003] In a pilot-operated solenoid valve, there is a difference in the area of ​​the left and right ends of the main valve core that bears the action of the medium. In a traditional solenoid valve, the inlet and the back pressure chamber are connected when the power is off, and the inlet pressure is equal to the back pressure chamber pressure, which wastes the electromagnet's attraction force and increases the size and weight of the electromagnet. The medium in the back pressure chamber is the same as the working medium. When the working medium of the solenoid valve is an active gas, the back pressure chamber is also filled with active gas, and when releasing gas, it will be discharged to the outside of the valve through the exhaust port, which reduces the safety of the solenoid valve and the engine system. Summary of the Invention

[0004] In order to solve one or more technical problems existing in the prior art, the present invention provides a medium supply solenoid valve for liquid rocket engines and a control method thereof.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: The present invention provides a medium supply solenoid valve for a liquid rocket engine, including an electromagnet drive assembly, a housing, a pilot valve core and a main valve core, wherein the housing is provided with an air inlet channel, an air outlet channel, an exhaust channel and a control channel communicating with the outside; the housing is provided with a pilot valve core mounting cavity and a main valve core mounting cavity. The main valve core is elastically installed in the main valve core mounting cavity and can open or close the connection between the air outlet channel and the air inlet channel; the pilot valve core is elastically installed in the pilot valve core mounting cavity. A back pressure chamber is formed between one axial end of the main valve core and the inner wall of the main valve core mounting cavity, and a first exhaust chamber is formed between one axial end of the pilot valve core and the inner wall of the pilot valve core mounting cavity. The back pressure chamber is connected to the first exhaust chamber through a connecting channel, and the control port at one end of the control channel is connected to the first exhaust chamber. The electromagnet drive assembly can drive the pilot valve core to move axially to open or disconnect the connection between the first exhaust chamber and the control channel, and to close or open the control port.

[0006] The beneficial effects of this invention are as follows: This invention is used for a medium supply solenoid valve for liquid rocket engines. It adopts a pilot-operated solenoid valve structure to realize the function of opening when energized and closing when de-energized. A control channel is added at the pilot valve core, and the control port of the control channel is used to open or close the pilot valve core to realize the independent charging and discharging of the back pressure chamber, thereby improving the safety of the engine system and reducing the weight of the solenoid valve.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the pilot valve core mounting cavity is connected to the exhaust channel through the pilot valve port, and the first exhaust chamber can be connected to the exhaust channel through the pilot valve port. The pilot valve core is driven by the electromagnet drive assembly to open or close the pilot valve port and close or open the control port.

[0009] Furthermore, one axial end of the main valve core is elastically connected to the inner wall of the main valve core mounting cavity via a main spring.

[0010] Furthermore, one axial end of the pilot valve core is elastically connected to the inner wall of the pilot valve core mounting cavity via a pilot spring.

[0011] Furthermore, the other end of the main valve core is provided with a first non-metallic sealing surface.

[0012] Furthermore, one end of the pilot valve core is provided with a second non-metallic sealing surface in the axial direction, and the other end of the pilot valve core is provided with a third non-metallic sealing surface in the axial direction.

[0013] Furthermore, the control channel has an L-shaped structure, and both the air intake channel and the air outlet channel have a straight-line structure.

[0014] Furthermore, the air intake channel and the air outlet channel are arranged perpendicularly.

[0015] Furthermore, the outer peripheral sidewall of the main valve core is connected to the inner sidewall of the main valve core mounting cavity via a sealing ring.

[0016] The present invention also provides a control method for a medium supply solenoid valve for a liquid rocket engine, comprising the following steps: The control channel first continuously supplies inert gas as control gas, and then the intake channel continuously supplies medium. The other end of the main valve core is subjected to the medium pressure in the intake channel. The control gas supplied in the control channel enters the back pressure chamber to generate pressure, which acts on one end face of the main valve core in the axial direction, so as to realize the main valve core to cut off the connection between the intake channel and the outlet channel, and make the medium supply solenoid valve seal. When supplying media to downstream equipment, the electromagnet drive assembly is energized and drives the pilot valve core to move downward, opening the connection between the first exhaust chamber and the exhaust channel, making the first exhaust chamber and the exhaust channel connected. At the same time, the lower end face of the pilot valve core blocks the control port of the control channel, cutting off the connection between the first exhaust chamber and the control channel. The control gas in the back pressure chamber enters the first exhaust chamber through the connection channel and is discharged through the exhaust channel. The other end of the main valve core is driven by the media to open the connection between the inlet channel and the outlet channel. The media enters the outlet channel and completes the media supply through the outlet channel. After the medium supply is completed, the medium is continuously introduced into the air intake channel, and the inert gas is continuously introduced into the control channel as control gas. The electromagnet drive assembly is de-energized and does not work. Under the pressure of the control gas introduced into the control channel, the pilot valve core moves upward and cuts off the connection between the first exhaust chamber and the exhaust channel, so that the first exhaust chamber and the exhaust channel are not connected. At the same time, the lower end face of the pilot valve core opens the control port of the control channel, so that the first exhaust chamber and the control channel are connected. The control gas enters the back pressure chamber from the control channel, the first exhaust chamber and the connecting channel. Under the action of the control gas pressure in the back pressure chamber, the main valve core moves axially to close the air outlet channel, thereby achieving the sealing of the medium supply solenoid valve.

[0017] The beneficial effects of this invention are as follows: The control method for the medium supply solenoid valve of this invention for a liquid rocket engine, by adding a control channel on the housing corresponding to the first exhaust chamber of the pilot valve core, connects to the first exhaust chamber of the pilot valve core, and uses inert gas as the control medium, enabling the inert gas to independently charge and discharge the back pressure chamber, thereby improving the safety of the rocket engine system. This invention can independently reduce the pressure in the back pressure chamber through the control channel. Because the back pressure chamber pressure is reduced, the electromagnet attraction force required for sealing the pilot valve core is reduced, thereby allowing for a smaller electromagnet size, resulting in a smaller and lighter overall solenoid valve. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the medium supply solenoid valve for a liquid rocket engine according to the present invention. Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle; Figure 3 for Figure 1 Schematic diagram of the structure in the C-direction; Figure 4 This is a cross-sectional view of the housing of the present invention; Figure 5 for Figure 4 A cross-sectional view of the EE structure; Figure 6 This is a top view of the housing structure of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Electromagnet drive assembly; 11. Push rod; 12. Electromagnet outer nut; 13. Adjusting screw; 14. Second exhaust chamber; 2. Housing; 21. Inlet passage; 22. Outlet passage; 23. Exhaust passage; 24. First exhaust chamber; 25. Back pressure chamber; 26. Connecting passage; 27. Pilot valve port; 28. Control port; 29. ​​Control passage; 290. Pilot valve core mounting chamber; 291. Main valve core mounting chamber; 3. Pilot valve core; 31. Pilot spring; 32. Second non-metallic sealing block; 33. Third non-metallic sealing block; 4. Main valve core; 41. Main spring; 42. First non-metallic sealing block; 43. Sealing ring; 5. Cover. Detailed Implementation

[0020] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] Example 1 like Figures 1-6 As shown, a medium supply solenoid valve for a liquid rocket engine according to this embodiment includes an electromagnet drive assembly 1, a housing 2, a pilot valve core 3, and a main valve core 4. The housing 2 has an air inlet channel 21, an air outlet channel 22, an exhaust channel 23, and a control channel 29 that communicate with the outside. The housing 2 has a pilot valve core mounting cavity 290 and a main valve core mounting cavity 291 formed inside the housing 2. The main valve core 4 is elastically and sealingly installed in the main valve core mounting cavity 291 and can open or close the connection between the air outlet channel 22 and the air inlet channel 21; the pilot valve core 3 is elastically installed in the pilot valve core mounting cavity 290. A back pressure chamber 25 is formed between one axial end of the main valve core 4 and the inner wall of the main valve core mounting cavity 291. A first exhaust chamber 24 is formed between one axial end of the pilot valve core 3 and the inner wall of the pilot valve core mounting cavity 290. The back pressure chamber 25 is connected to the first exhaust chamber 24 through the connecting channel 26. The control port 28 at one end of the control channel 29 is connected to the first exhaust chamber 24. The electromagnet drive assembly 1 can drive the pilot valve core 3 to move axially to open or disconnect the connection between the first exhaust chamber 24 and the control channel 29, and to close or open the control port 28.

[0022] One specific solution in this embodiment is as follows: Figure 1 and Figure 2As shown, the pilot valve core mounting cavity 290 is connected to the exhaust channel 23 through the pilot valve port 27, and the first exhaust cavity 24 is connected to the exhaust channel 23 through the pilot valve port 27. The pilot valve core 3 is driven by the electromagnet drive assembly 1 to open or close the pilot valve port 27 and close or open the control port 28.

[0023] Specifically, such as Figure 1 and Figure 2 As shown, one axial end of the main valve core 4 is elastically connected to the inner wall of the main valve core mounting cavity 291 via a main spring 41. One axial end of the pilot valve core 3 is elastically connected to the inner wall of the pilot valve core mounting cavity 290 via a pilot spring 31.

[0024] One specific solution in this embodiment is as follows: Figure 1 and Figure 2 As shown, the main valve core 4 has a first non-metallic sealing surface at one end along its axial direction. The pilot valve core 3 has a second non-metallic sealing surface at one end along its axial direction, and a third non-metallic sealing surface at the other end along its axial direction. Specifically, a first dovetail groove can be formed on the end face of the main valve core 4 along its axial direction, and a first non-metallic sealing block 42 can be formed by hot-pressing polyimide in the first dovetail groove; a second dovetail groove can be formed on the end face of the pilot valve core 3 along its axial direction, and a second non-metallic sealing block 32 can be formed by hot-pressing polyimide in the second dovetail groove; a third dovetail groove can be formed on the end face of the pilot valve core 3 along its axial direction, and a third non-metallic sealing block 33 can be formed by hot-pressing polyimide in the third dovetail groove.

[0025] like Figure 5 As shown, preferably, the control channel 29 has an L-shaped structure, and the air intake channel 21 and the air outlet channel 22 both have a straight structure.

[0026] like Figure 1 and Figure 4 As shown, specifically, the air intake channel 21 and the air outlet channel 22 are arranged perpendicularly.

[0027] like Figure 1 As shown, specifically, the outer peripheral wall of the main valve core 4 is sealed and movably connected to the inner wall of the main valve core mounting cavity 291 through a sealing ring 43 and a retaining ring. The other end of the main valve core mounting cavity in the axial direction is an open structure, which facilitates the installation of the main valve core 4 and the main spring 41. After the main valve core 4 and the main spring 41 are installed, a plug 5 is installed at the open structure. The plug 5 and the main valve core 4 form the back pressure cavity 25. The plug 5 is screwed into the housing 2 by threads and achieves a static seal with the housing through a sealing gasket. The plug 5 can limit the main valve core and ensure the valve's working stroke.

[0028] In this embodiment, the electromagnet drive assembly 1 can adopt the electromagnet drive structure commonly used in solenoid valves, including an armature and an electromagnet. A push rod 11 is movably inserted inside. When the electromagnet is energized, the armature is attracted downwards, and the push rod 11 drives the pilot valve core 3 to move axially. Specifically, one end of the push rod 11 passes through the pilot valve port 27, extends into the pilot valve core mounting cavity, and abuts against the pilot valve core 3. The electromagnet drive assembly 1 can drive the push rod 11 to move axially, thereby driving the pilot valve core 3 to move axially. In this embodiment, the electromagnet drive assembly 1 can be fixed to the pilot valve port 27 of the pilot valve core mounting cavity of the housing 2 by an electromagnet outer nut 12. The electromagnet outer nut 12 seals and presses the electromagnet drive assembly 1 tightly against the pilot valve port 27 of the housing 2. A second exhaust chamber 14 is formed inside the end of the electromagnet drive assembly 1 used to connect to the electromagnet outer nut 12. An exhaust channel 23 is opened on the side wall of the second exhaust chamber 14. The medium first enters the second exhaust chamber 14 and then exhausts through the exhaust channel 23. An adjusting screw 13 is installed at the end of the electromagnet drive assembly 1 that is away from the second exhaust chamber. The adjusting screw 13 is threaded onto the electromagnet drive assembly 1 and coaxially abuts against the push rod 11. The position of the push rod 11 in the electromagnet drive assembly 1 can be adjusted by tightening or loosening the adjusting screw 13.

[0029] Specifically, in this embodiment, the two-position three-way solenoid valve for the liquid rocket engine operates at a DC voltage of 24V, and the inlet and outlet channels have a diameter of 6mm.

[0030] This embodiment uses a pilot-operated solenoid valve for the medium supply of a liquid rocket engine. It achieves the function of opening when energized and closing when de-energized. A control channel is added to the pilot valve core, and the control port of the pilot valve core is used to open or close the control channel, enabling independent charging and discharging of the back pressure chamber. This improves the safety of the engine system and reduces the weight of the solenoid valve. There is an area difference between the left and right ends of the main valve core of the solenoid valve that bear the medium's action. Under the condition of ensuring the sealing of the solenoid valve's inlet and outlet, the back pressure chamber pressure can be less than the inlet (intake channel) pressure. In ordinary solenoid valves, the back pressure chamber is directly connected to the inlet (intake channel), resulting in the back pressure chamber pressure being equal to the inlet (intake channel) pressure. This makes it impossible to independently reduce the back pressure chamber pressure, thus requiring a large electromagnet attraction force for the pilot valve core to seal. This solenoid valve can independently reduce the back pressure chamber pressure through the control channel. Because the back pressure chamber pressure is reduced, the electromagnet attraction force required for the pilot valve core to seal is reduced, thereby allowing for a smaller electromagnet size and making the entire solenoid valve smaller and lighter.

[0031] Example 2 This embodiment provides a control method for the medium supply solenoid valve of the liquid rocket engine described in Embodiment 1 above, including the following steps: Inert gas is continuously introduced into the control channel 29 as control gas, and then medium is continuously introduced into the inlet channel 21. The other end of the main valve core 4 is subjected to the medium pressure of the inlet channel 21. The control gas introduced into the control channel 29 enters the back pressure chamber 25 to generate pressure, and together with the pressure of the main spring 41, it acts on one end face of the main valve core 4 in the axial direction, so that the main valve core 4 cuts off the connection between the inlet channel 21 and the outlet channel 22, so that the medium supply solenoid valve is sealed and the valve is kept closed. When supplying media to downstream equipment, the electromagnet drive assembly 1 is energized and drives the pilot valve core 3 to move downward, opening the connection between the first exhaust chamber 24 and the exhaust channel 23, making the first exhaust chamber 24 and the exhaust channel 23 connected. At the same time, the lower end face of the pilot valve core 3 blocks the control port 28 of the control channel 29, cutting off the connection between the first exhaust chamber 24 and the control channel 29. The control gas in the back pressure chamber 25 enters the first exhaust chamber 24 through the connecting channel 26 and is discharged through the exhaust channel 23. The other end of the main valve core 4 is driven by the media to open the connection between the inlet channel 21 and the outlet channel 22 (a pressure difference is generated between the left and right ends of the main valve core). The media enters the outlet channel 22 and completes the media supply through the outlet channel 22. After the medium supply is completed, the medium is continuously introduced into the air inlet channel 21, and the inert gas is continuously introduced into the control channel 29 as control gas. The electromagnet drive assembly 1 is de-energized and does not work. Under the combined action of the control gas pressure introduced into the control channel 29 and the pressure of the pilot spring 31, the pilot valve core 3 moves upward and cuts off the connection between the first exhaust chamber 24 and the exhaust channel 23, so that the first exhaust chamber 24 and the exhaust channel 23 are not connected. At the same time, the lower end face of the pilot valve core 3 opens the control port 28 of the control channel 29, so that the first exhaust chamber 24 is connected to the control channel 29. The control gas enters the back pressure chamber from the control channel 29, the first exhaust chamber 24 and the connecting channel 26. Under the combined action of the control gas pressure and the main spring 41 in the back pressure chamber 25, the main valve core 4 moves axially to close the air outlet channel 22, thereby achieving the sealing of the medium supply solenoid valve.

[0032] In this embodiment, the medium can be an active gas such as oxygen, which has poor stability. The medium supply solenoid valve connects to the lower channel of the pilot valve seat on the housing by opening a control channel on the housing. Using inert gas helium as the control medium, helium is used to charge and discharge the back pressure chamber separately, thereby improving the safety of the rocket engine system.

[0033] This embodiment describes a control method for a medium supply solenoid valve in a liquid rocket engine. The solenoid valve utilizes a control channel added to its housing at a position corresponding to the first exhaust chamber of the pilot valve core. This channel connects to the first exhaust chamber of the pilot valve core, and inert gas is used as the control medium. This allows for the independent charging and discharging of the back pressure chamber by the inert gas, improving the safety of the rocket engine system. This invention can independently reduce the back pressure chamber pressure through the control channel. Because the back pressure chamber pressure is reduced, the electromagnet's attraction force required for sealing the pilot valve core is decreased, thereby reducing the size of the electromagnet and making the entire solenoid valve smaller and lighter.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A medium supply solenoid valve for a liquid rocket engine, characterized in that, It includes an electromagnet drive assembly, a housing, a pilot valve core, and a main valve core. The housing has an air inlet channel, an air outlet channel, an exhaust channel, and a control channel that communicate with the outside. The housing has a pilot valve core mounting cavity and a main valve core mounting cavity. The main valve core is elastically installed in the main valve core mounting cavity and can open or close the connection between the air outlet channel and the air inlet channel; the pilot valve core is elastically installed in the pilot valve core mounting cavity. A back pressure chamber is formed between one axial end of the main valve core and the inner wall of the main valve core mounting cavity, and a first exhaust chamber is formed between one axial end of the pilot valve core and the inner wall of the pilot valve core mounting cavity. The back pressure chamber is connected to the first exhaust chamber through a connecting channel, and the control port at one end of the control channel is connected to the first exhaust chamber. The electromagnet drive assembly can drive the pilot valve core to move axially to open or disconnect the connection between the first exhaust chamber and the control channel, and to close or open the control port.

2. The medium supply solenoid valve for a liquid rocket engine according to claim 1, characterized in that, The pilot valve core mounting cavity is connected to the exhaust channel through the pilot valve port. The first exhaust chamber can be connected to the exhaust channel through the pilot valve port. The pilot valve core is driven by the electromagnet drive assembly to open or close the pilot valve port and close or open the control port.

3. The medium supply solenoid valve for a liquid rocket engine according to claim 1, characterized in that, One axial end of the main valve core is elastically connected to the inner wall of the main valve core mounting cavity via a main spring.

4. The medium supply solenoid valve for a liquid rocket engine according to claim 1, characterized in that, One axial end of the pilot valve core is elastically connected to the inner wall of the pilot valve core mounting cavity via a pilot spring.

5. The medium supply solenoid valve for a liquid rocket engine according to claim 1, characterized in that, The other end of the main valve core is provided with a first non-metallic sealing surface.

6. The medium supply solenoid valve for a liquid rocket engine according to claim 1, characterized in that, The pilot valve core has a second non-metallic sealing surface at one end in the axial direction and a third non-metallic sealing surface at the other end in the axial direction.

7. The medium supply solenoid valve for a liquid rocket engine according to claim 1, characterized in that, The control channel has an L-shaped structure, and both the air intake channel and the air outlet channel have a straight structure.

8. The medium supply solenoid valve for a liquid rocket engine according to claim 7, characterized in that, The air intake channel and the air outlet channel are arranged perpendicularly.

9. A medium supply solenoid valve for a liquid rocket engine according to claim 1, characterized in that, The outer peripheral wall of the main valve core is connected to the inner wall of the main valve core mounting cavity through a sealing ring.

10. A control method for a medium supply solenoid valve for a liquid rocket engine according to any one of claims 1 to 9, characterized in that, Includes the following steps: The control channel first continuously supplies inert gas as control gas, and then the intake channel continuously supplies medium. The other end of the main valve core is subjected to the medium pressure in the intake channel. The control gas supplied in the control channel enters the back pressure chamber to generate pressure, which acts on one end face of the main valve core in the axial direction, so as to realize the main valve core to cut off the connection between the intake channel and the outlet channel, and make the medium supply solenoid valve seal. When supplying media to downstream equipment, the electromagnet drive assembly is energized and drives the pilot valve core to move downward, opening the connection between the first exhaust chamber and the exhaust channel, making the first exhaust chamber and the exhaust channel connected. At the same time, the lower end face of the pilot valve core blocks the control port of the control channel, cutting off the connection between the first exhaust chamber and the control channel. The control gas in the back pressure chamber enters the first exhaust chamber through the connection channel and is discharged through the exhaust channel. The other end of the main valve core is driven by the media to open the connection between the inlet channel and the outlet channel. The media enters the outlet channel and completes the media supply through the outlet channel. After the medium supply is completed, the medium is continuously introduced into the air intake channel, and the inert gas is continuously introduced into the control channel as control gas. The electromagnet drive assembly is de-energized and does not work. Under the pressure of the control gas introduced into the control channel, the pilot valve core moves upward and cuts off the connection between the first exhaust chamber and the exhaust channel, so that the first exhaust chamber and the exhaust channel are not connected. At the same time, the lower end face of the pilot valve core opens the control port of the control channel, so that the first exhaust chamber and the control channel are connected. The control gas enters the back pressure chamber from the control channel, the first exhaust chamber and the connecting channel. Under the action of the control gas pressure in the back pressure chamber, the main valve core moves axially to close the air outlet channel, thereby achieving the sealing of the medium supply solenoid valve.

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