Low-temperature electromagnetic valve and carrier rocket

Abstract

The invention provides a low-temperature electromagnetic valve and a carrier rocket, the low-temperature electromagnetic valve comprises a main valve and a pilot valve, and the pilot valve is arranged above the main valve; the pilot valve is of a two-position three-way valve structure; a sealing gasket and a heat insulation gap are arranged between the main valve and the pilot valve, the sealing gasket is used for sealing between the pilot valve and the main valve, and the heat insulation gap is used for avoiding heat conduction between the pilot valve and the main valve; the main valve and the pilot valve are both made of low-temperature-resistant medium materials. According to the embodiment of the invention, a two-stage pilot structure of the main valve and the pilot valve is adopted, the main valve adopts a combined sealing ring structure to solve the problem of high-pressure ultralow-temperature dynamic sealing, the pilot electromagnetic valve is designed into a two-position three-way valve structure, and clearance heat insulation and material heat insulation design is adopted, so that a heat insulation structure of the electromagnetic valve is realized; the influence of low-temperature medium overcurrent on the electromagnet is reduced to the maximum extent, and it is ensured that the electromagnet can work reliably in the low-temperature and high-pressure state.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic solenoid valves for launch vehicles, and particularly relates to a cryogenic solenoid valve and a launch vehicle. Background Art

[0002] The solenoid valve is a commonly used valve in the pressurization and transfer system of a launch vehicle, used to control the on-off of the gas in the gas cylinder flowing downstream to the storage tank. When the pressure of the rocket storage tank rises or falls, by closing or opening the solenoid valve, the pressure in the storage tank can be controlled within the working range required by the system. The solenoid valve for pressurization is usually a high-pressure solenoid valve, which can meet the working requirements of gas cylinders with relatively high pressures and satisfy the needs of the existing pressurization and transfer system of launch vehicles;

[0003] In the existing pressurization and transfer system of launch vehicles, normal-temperature gas is usually used to pressurize the storage tank. Therefore, the solenoid valve for pressurization is usually a normal-temperature solenoid valve, and the working temperature is generally 243K - 323K. However, the existing solenoid valve cannot meet the requirements of the new launch vehicle pressurization and transfer system using cryogenic gas (the temperature can be as low as 80K). In a cryogenic environment, the materials of the valve body and the valve core will change in strength and structure under the influence of temperature, and the original normal-temperature mating clearance and electromagnetic characteristics of the solenoid valve will also change accordingly. To ensure the functional performance and working reliability of the valve, high requirements are put forward for the structural design, material selection, clearance and seal design, etc. of the solenoid valve. Summary of the Invention

[0004] In view of this, an object of an embodiment of the present invention is to provide a cryogenic solenoid valve and a launch vehicle to solve the above technical problems.

[0005] To achieve the above object, in a first aspect, an embodiment of the present invention provides a cryogenic solenoid valve, the cryogenic solenoid valve includes a main valve and a pilot valve, and the pilot valve is disposed above the main valve;

[0006] The pilot valve is of a two-position three-way valve structure;

[0007] A sealing gasket and a heat insulation gap are provided between the main valve and the pilot valve. The sealing gasket is used for the sealing between the pilot valve and the main valve, and the heat insulation gap is used to avoid heat conduction between the pilot valve and the main valve;

[0008] Both the main valve and the pilot valve are made of materials resistant to cryogenic media.

[0009] In some possible implementation manners, the main valve includes: the main valve includes a main valve body, a main valve core, a main valve spring, a nozzle and a non-metallic first sealing ring;

[0010] The main valve core is installed in the inner cavity guiding hole of the main valve body, and a first sealing ring is provided on the main valve core;

[0011] A main valve spring is installed between the main valve core and the bottom of the hole in the main valve body. A spring cavity is formed among the main valve spring, the main valve core and the bottom of the hole in the main valve body. A first medium flow passage capable of communicating with the pilot valve is arranged on the side surface of the spring cavity.

[0012] The nozzle is installed outside the guiding hole of the main valve core. A valve seat is arranged at the contact part between the nozzle and the main valve core for sealing between the nozzle and the main valve core.

[0013] In some possible embodiments, a sealing gasket is installed between the nozzle and the main valve body. When the nozzle is connected to the main valve body, the sealing gasket is extruded.

[0014] In some possible embodiments, a plurality of annular grooves are arranged on the outer peripheral surface of the main valve core for installing guiding sealing rings respectively.

[0015] The guiding sealing rings are a combination of two identical non-metallic sealing rings or a combination of two different sealing rings.

[0016] In some possible embodiments, the pilot valve includes: an electromagnetic component, a pilot valve core, an end cover, and a pilot valve spring.

[0017] The electromagnetic component is arranged on the main valve. A sealing ring and a heat insulation gap are arranged between the electromagnetic component and the main valve. The electromagnetic component is bolted to the main valve.

[0018] The pilot valve core is installed in the inner cavity guiding hole of the electromagnetic component. The pilot valve spring is installed between the pilot valve core and the bottom of the hole of the electromagnetic component.

[0019] The end cover is installed outside the guiding hole of the pilot valve core. An exhaust valve seat is arranged at the contact part between the end cover and the pilot valve core for exhaust sealing between the end cover and the pilot valve core.

[0020] An intake valve seat is arranged at the lower end of the electromagnetic component for intake sealing between the electromagnetic component and the pilot valve core. A second medium flow passage and a third medium flow passage are respectively arranged inside and outside the intake valve seat. The second medium flow passage communicates with the main valve, and the third medium flow passage communicates with the medium inlet of the main valve body.

[0021] In some possible embodiments, a diversion groove is arranged on the outer side surface of the pilot valve core for medium flow between the upper end surface and the lower two end surfaces of the pilot valve core.

[0022] In some possible embodiments, second sealing rings are respectively provided on the end faces of the pilot valve core in contact with the electromagnetic assembly and the end cover, and are respectively used for sealing between the pilot valve core and the electromagnetic assembly and the end cover.

[0023] In some possible embodiments, a sealing gasket is installed between the end cover and the electromagnetic assembly, and the sealing gasket is compressed when the end cover and the electromagnetic assembly are connected.

[0024] In some possible embodiments, an exhaust hole and an exhaust check valve are provided at the opening of the end cover, and the exhaust check valve includes a gland, a steel ball and an exhaust check valve spring;

[0025] The steel ball is installed in the opening of the end cover and is tightly attached to and sealed with the exhaust valve seat; the gland is installed outside the steel ball, the exhaust check valve spring is installed between the gland and the steel ball, and the gland and the end cover are fixed by tightening threads, and the movement stroke of the steel ball is fixed.

[0026] In a second aspect, an embodiment of the present invention further provides a launch vehicle, and the launch vehicle adopts a cryogenic solenoid valve according to any one of the first aspect.

[0027] The embodiment of the present invention has the following beneficial effects:

[0028] The cryogenic solenoid valve and the launch vehicle provided by the embodiment of the present invention adopt a two-stage pilot structure of a main valve and a pilot valve. The main valve uses a combined sealing ring structure to solve the problem of high-pressure cryogenic dynamic sealing. The pilot valve solenoid valve is designed as a two-way three-way valve structure, supplemented by gap heat insulation and material heat insulation design, realizing the heat insulation structure of the solenoid valve, minimizing the influence of the cryogenic medium flowing through on the electromagnet to the greatest extent, and ensuring its reliable operation under low-temperature and high-pressure conditions;

[0029] The cryogenic solenoid valve and the launch vehicle provided by the embodiment of the present invention can adapt to the working conditions of cryogenic and high-pressure gas media, have a wide temperature and pressure adaptation range, good medium and environmental adaptability, high working reliability, and a compact structure, and can meet the requirements for the development of new rockets. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a cryogenic solenoid valve according to an embodiment of the present invention.

[0032] Explanation of the reference numerals in the drawings:

[0033] 1. Main valve body; 2. Main spool; 3. Main valve spring; 4. First guiding sealing ring; 5. Second guiding sealing ring; 6. First medium flow passage; 7. Second medium flow passage; 8. Electromagnetic assembly; 9. End cover; 10. Nozzle; 11. First sealing ring; 12. Third medium flow passage; 13. Pilot valve spring; 14. Pilot spool; A. Heat insulation gap. Detailed implementation manners

[0034] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention. In the drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessarily obscuring the present invention; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0035] An embodiment of the present invention provides a cryogenic solenoid valve to solve the above technical problems. The cryogenic solenoid valve adopts a two-stage pilot structure. The main valve uses a combined sealing ring structure to solve the sealing problem of high pressure and ultra-low temperature. The pilot solenoid valve is designed as a two-way three-way valve structure, supplemented by gap heat insulation and material heat insulation designs, realizing the heat insulation structure of the solenoid valve, minimizing the influence of the low-temperature medium flow on the solenoid valve to the greatest extent, and ensuring its reliable operation under low-temperature and high-pressure conditions. The cryogenic solenoid valve can adapt to the working conditions of low-temperature and high-pressure gas media, has the characteristics of wide temperature and pressure adaptation ranges, good medium and environmental adaptability, high working reliability, and compact structure, and can meet the requirements of the development of new rockets.

[0036] Embodiment 1

[0037] Figure 1 is a schematic structural diagram of a cryogenic solenoid valve according to an embodiment of the present invention, as Figure 1As shown, the cryogenic solenoid valve includes a main valve and a pilot valve. The pilot valve is arranged above the main valve. The pilot valve is of a two-position three-way valve structure. A sealing gasket and a heat insulation gap A are provided between the main valve and the pilot valve. The sealing gasket is used for the sealing between the pilot valve and the main valve, and the heat insulation gap A is used to avoid heat conduction between the pilot valve and the main valve. Both the main valve and the pilot valve are made of cryogenic medium-resistant materials. In this embodiment, the cryogenic medium-resistant materials refer to materials that will not reduce in strength and undergo significant deformation at low temperatures, such as titanium alloy and stainless steel. Cryogenic temperature refers to the temperature from natural low temperature to the temperature that liquid oxygen or liquid nitrogen can reach, approximately 80K to 232K.

[0038] In this embodiment, the main materials of the main valve are all cryogenic medium-resistant materials, and with appropriate design parameters and structures, the strength, reliable operation, and sealing can be ensured in cryogenic media. The pilot valve adopts a two-position three-way structure. When in the power-off state, the cryogenic medium is enclosed in the closed space between the pilot valve and the main valve without flowing, reducing the heat exchange between the cryogenic medium and the pilot valve. When in the power-on state, the cryogenic medium enclosed in the closed space between the pilot valve and the main valve is discharged through the exhaust port of the pilot valve, removing most of the direct contact cold sources and reducing the heat exchange between the cryogenic medium and the pilot valve. The heat insulation of the pilot valve structure is achieved through structural design. Except for the sealed part of the sealing gasket and the directly contacted connecting bolts between the main valve and the pilot valve, a heat insulation gap A of 0.6 - 1.0 mm is reserved to avoid large-area heat conduction between the pilot valve and the main valve and achieve gap heat insulation. The parts of the pilot valve and the main valve in direct contact and the connecting bolts are all made of materials with low thermal conductivity to reduce heat conduction from the material and achieve material heat insulation.

[0039] In the embodiment of the present invention, the main valve uses a combined sealing ring structure to solve the problem of high-pressure cryogenic dynamic sealing. The pilot valve solenoid valve is designed as a two-position three-way valve structure. By setting the heat insulation gap A and supplementing it with gap heat insulation and material heat insulation designs, the heat insulation structure of the solenoid valve is realized, minimizing the influence of the cryogenic medium flow on the electromagnet to the greatest extent and ensuring its reliable operation under cryogenic high-pressure conditions.

[0040] The cryogenic solenoid valve of this embodiment can adapt to the working conditions of cryogenic high-pressure gas media, has the characteristics of a wide temperature and pressure adaptation range, good medium and environmental adaptability, high working reliability, and a compact structure, and can meet the requirements for the development of new rockets.

[0041] As Figure 1As shown, in some embodiments, the main valve includes: a main valve body 1, a main valve core 2, a main valve spring 3, a nozzle 10 and a first sealing ring 11; the main valve core 2 is installed in the inner cavity guiding hole of the main valve body 1, a first sealing ring 11 is arranged on the main valve core 2, the first sealing ring 11 can be a non-metallic sealing ring, a main valve spring 3 is installed between the main valve core 2 and the bottom of the hole of the main valve body 1, a spring cavity is formed among the main valve spring 3, the main valve core 2 and the bottom of the hole of the main valve body 1, and a first medium flow passage 6 capable of communicating with the pilot valve is arranged on the side surface of the spring cavity; the nozzle 10 is installed outside the guiding hole of the main valve core 2, and a valve seat is arranged at the contact part between the nozzle 10 and the main valve core 2 for sealing between the nozzle 10 and the main valve core 2.

[0042] Specifically, a medium inlet is arranged at the lower end of the main valve body 1, the inlet communicates with the inner cavity of the main valve body 1, the right side opening is used for installing the main valve core 2 and the nozzle 10, the upper end of the main valve body 1 is used for connecting the pilot valve, the main valve core 2 is installed in the inner cavity guiding hole of the main valve body 1, a first sealing ring 11 is arranged on the main valve core 2, the first sealing ring 11 can be a non-metallic sealing ring, a main valve spring 3 is installed between the main valve core 2 and the bottom of the hole of the main valve body 1, a first medium flow passage 6 capable of communicating with the main valve body 1 is arranged on the side surface of the spring cavity formed by the main valve core 2 and the bottom of the hole of the main valve body 1, the nozzle 10 is installed outside the guiding hole of the main valve core 2, a valve seat is arranged at the contact part between the nozzle 10 and the main valve core 2 for sealing between the nozzle 10 and the main valve core 2, and the nozzle 10 can be connected with an external pipeline, which is the medium outlet.

[0043] As Figure 1 shown, in some embodiments, a sealing gasket is installed between the nozzle 10 and the main valve body 1, and is respectively arranged at Figure 1 the position B shown. When the nozzle 10 is connected with the main valve body 1, the sealing gasket is extruded for sealing between the main valve body 1 and the nozzle 10 and fixing the movement stroke of the main valve core 2.

[0044] In this embodiment, a sealing gasket is installed between the nozzle 10 and the main valve body 1, and the sealing gasket is extruded by tightening the thread to realize the sealing between the main valve body 1 and the nozzle 10 and fix the movement stroke of the main valve core 2. In this embodiment, the nozzle 10 and the main valve body 1 can be connected by threads or welded as long as the sealing gasket is tightened during connection.

[0045] As Figure 1 shown, in some embodiments, a plurality of annular grooves are arranged on the outer peripheral surface of the main valve core 2 for installing guide sealing rings respectively. The guide sealing rings are a combination of the same non-metallic sealing rings or a combination of two different sealing rings.

[0046] Specifically, in this embodiment, two annular grooves are provided on the outer circle of the main spool 2 for installing the first guide seal ring 4 and the second guide seal ring 5. The guide seal rings can be a combination of two identical non-metallic seal rings, or can be replaced by a combination of two different seal rings, which can play the same sealing role.

[0047] As Figure 1 shown, in some embodiments, the pilot valve includes: an electromagnetic assembly 8, a pilot spool 14, an end cover 9, and a pilot valve spring 13; the electromagnetic assembly 8 is disposed on the main valve, a seal ring and a heat insulation gap A are provided between the electromagnetic assembly 8 and the main valve, and the electromagnetic assembly 8 is bolted to the main valve; the pilot spool 14 is installed in the inner cavity guide hole of the electromagnetic assembly 8, and the pilot valve spring 13 is installed between the pilot spool 14 and the bottom of the hole of the electromagnetic assembly 8; the end cover 9 is installed outside the guide hole of the pilot spool 14, and an exhaust valve seat is provided at the contact portion between the end cover 9 and the pilot spool 14 for exhaust sealing between the end cover 9 and the pilot spool 14; an intake valve seat is provided at the lower end of the electromagnetic assembly 8 for intake sealing between the electromagnetic assembly 8 and the pilot spool 14. A second medium flow passage 7 and a third medium flow passage 12 communicating with the main valve body 1 are respectively provided inside and outside the intake valve seat. The second medium flow passage 7 communicates with the first medium flow passage 6, and the third medium flow passage 12 communicates with the medium inlet of the main valve body 1.

[0048] Specifically, an intake valve seat is provided at the lower end of the electromagnetic assembly 8 for intake sealing between the electromagnetic assembly 8 and the pilot spool 14. Two medium flow passages, namely a second medium flow passage 7 and a third medium flow passage 12, are respectively provided inside and outside the intake valve seat. After the solenoid valve is installed, it can respectively communicate with the medium inlet on the main valve body 1 and the first medium flow passage 6. The upper end of the electromagnetic assembly 8 is open for installing the pilot spool 14 and the pilot valve spring 13. The pilot spool 14 is installed in the inner cavity guide hole of the electromagnetic assembly 8. Second seal rings are respectively provided at both ends of the pilot spool 14. The second seal rings can be non-metallic seal rings. The pilot valve spring 13 is installed between the pilot spool 14 and the bottom of the hole of the electromagnetic assembly 8. The end cover 9 is installed outside the guide hole of the pilot spool 14. An exhaust valve seat is provided at the contact portion between the end cover 9 and the pilot spool 14 for exhaust sealing between the end cover 9 and the pilot spool 14. A sealing gasket is installed between the end cover 9 and the electromagnetic assembly 8. By tightening the thread to squeeze the sealing gasket, the sealing between the electromagnetic assembly 8 and the end cover 9 is realized, and the movement stroke of the pilot spool 14 is fixed.

[0049] After the solenoid valve is installed, when the pilot valve is de-energized, the pilot valve core 14 is in a state where the air inlet is open and the exhaust port is closed and sealed. The inlet of the solenoid valve is sequentially connected to the inner cavity of the main valve body 1, the third medium flow passage 12, the inner cavity of the electromagnetic assembly 8, the second medium flow passage 7, the first medium flow passage 6, and the spring cavity formed by the main valve core 2 and the bottom of the guiding hole of the main valve body 1. The main valve core 2 is in a closed state under the action of the spring force of the main valve spring 3 and the medium force.

[0050] When the pilot valve is energized, the pilot valve core 14 is in a state where the air inlet is closed and sealed and the exhaust port is open under the action of electromagnetic suction. The inlet of the solenoid valve is only connected to the inner cavity of the main valve body 1 and the third medium flow passage 12. The low-temperature medium in the spring cavity formed by the main valve core 2 and the bottom of the guiding hole of the main valve body 1 is discharged through the first medium flow passage 6, the second medium flow passage 7, the inner cavity of the electromagnetic assembly 8 and the exhaust check valve. The main valve core 2 is in an open state by overcoming the spring force of the main valve spring 3 under the action of the medium force, and the incoming medium of the solenoid valve flows to the outlet.

[0051] In some embodiments, the sealing gaskets between the nozzle 10 and the main valve body 1, the end cover 9 and the electromagnetic assembly 8, and the pilot valve and the main valve can be made of metal materials or non-metal materials. The sealing structure can be a gasket sealing structure or can be replaced by other sealing structures such as rubber sealing rings, which can play the same sealing role.

[0052] In some embodiments, a flow guiding groove is provided on the outer side surface of the pilot valve core 14, and the flow guiding groove is used for the medium flow between the upper end surface and the lower two end surfaces of the pilot valve core 14.

[0053] In some embodiments, second sealing rings are respectively provided on the end surfaces of the pilot valve core 14 in contact with the electromagnetic assembly 8 and the end cover 9. The second sealing rings are non-metal sealing rings and are respectively used for the sealing between the pilot valve core 14 and the electromagnetic assembly 8 and the end cover 9.

[0054] In some embodiments, a sealing gasket is installed between the end cover 9 and the electromagnetic assembly 8. When the end cover 9 and the electromagnetic assembly 8 are connected, the sealing gasket is squeezed, which is used for the sealing between the electromagnetic assembly 8 and the end cover 9 and for fixing the movement stroke of the pilot valve core 14.

[0055] In some embodiments, an exhaust hole and an exhaust check valve are provided at the opening of the end cover 9. The exhaust check valve includes a gland, a steel ball and an exhaust check valve spring; the steel ball is installed in the opening of the end cover 9 and is tightly sealed against the exhaust valve seat; the gland is installed outside the steel ball, the exhaust check valve spring is installed between the gland and the steel ball, and the gland and the end cover are fixed by tightening threads, and the movement stroke of the steel ball is fixed.

[0056] Specifically, the opening at the upper end of the end cap 9 is used for installing the exhaust check valve. An exhaust hole and an exhaust check valve seat are arranged inside the opening. The steel ball is installed inside the opening of the end cap and is in close contact with the exhaust valve seat for sealing. The gland is installed outside the steel ball, and an exhaust check valve spring is installed between the gland and the steel ball. The gland and the end cap are fixed by tightening the thread, and the movement stroke of the steel ball is fixed. Two sealing gaskets are arranged between the main valve and the pilot valve and are connected and fastened by bolts and spring washers; in this embodiment, by arranging an exhaust check valve at the exhaust end of the pilot valve, it is possible to prevent external water vapor from entering the inside of the pilot valve and reduce the risk of freezing of the pilot valve core at low temperatures.

[0057] The working principle of a low-temperature solenoid valve provided by an embodiment of the present invention is as follows:

[0058] When the pilot valve is de-energized, the main valve core 2 is in a closed state under the elastic force of the main valve spring 3, and the pilot valve core 14 is in a state where the inlet is open and the exhaust port is closed under the elastic force of the pilot valve spring. At this time, a low-temperature medium is introduced into the inlet. The low-temperature medium enters the inner cavity of the main valve body 1 from the inlet, and part of the medium enters the inner cavity of the pilot valve through the third medium flow passage 12, and then enters the spring cavity between the main valve core 2 and the bottom of the guiding hole of the main valve body 1 through the second medium flow passage 7 and the first medium flow passage 6. The main valve core 2 remains in a closed state under the combined action of the elastic force of the main valve spring 3 and the medium force, and the pilot valve core 14 remains in a state where the inlet is open and the exhaust port is closed under the combined action of the elastic force of the pilot valve spring 13 and the medium force. After the medium fills the internal cavity of the solenoid valve, the medium stops flowing.

[0059] When the pilot valve is energized, the pilot valve core 14 moves downward under the action of the electromagnetic attraction force, overcoming the elastic force of the pilot valve spring 13 and the medium force, and maintains a state where the inlet is closed and the exhaust port is open. The medium in the main valve spring cavity passes through the first medium flow passage 6 and the second medium flow passage 7, passes behind the exhaust valve seat of the pilot valve and the exhaust check valve, and is discharged from the exhaust port. The main valve core 2 moves leftward under the action of the medium force, overcoming the elastic force of the main valve spring, until the left end of the main valve core contacts the bottom of the hole of the main valve body 1. The main valve core 2 is in an open state, and the low-temperature medium realizes the connection between the inlet and the outlet of the solenoid valve and continues to flow downstream.

[0060] When the pilot valve is de-energized, the electromagnetic attraction force of the electromagnetic assembly 8 disappears. The pilot valve core 14 moves upward under the combined action of the pilot valve spring 13 and the medium force and maintains a state where the inlet is open and the exhaust port is closed. Part of the medium enters the inner cavity of the pilot valve through the inlet of the pilot valve, and then enters the spring cavity between the main valve core 2 and the bottom of the guiding hole of the main valve body 1 through the first medium flow passage 6 and the second medium flow passage 7. The main valve core 2 moves rightward under the combined action of the main valve spring 3 and the medium force until it closes.

[0061] In this embodiment, the pilot valve adopts a two-way three-way solenoid valve structure with a normally open intake port and a normally closed exhaust port, which can be replaced by a two-way three-way solenoid valve structure with a normally closed intake port and a normally open exhaust port, and can play the same heat insulation role of preventing continuous flow of low-temperature medium in the pilot valve.

[0062] In addition, the valve seats provided at the contact parts between the connecting nozzle 10 and the main valve core 2, and the intake valve seats provided at the lower ends of the electromagnetic components 8 can all adopt a non-metallic plane - metal boss sealing structure, and can also be replaced by a metal plane - plane or metal cone - cone sealing structure, which can play the same sealing role;

[0063] The exhaust valve seat provided at the contact part between the end cover 9 and the pilot valve core 14 is a steel ball - metal cone sealing structure, and can also be replaced by a metal plane - plane sealing structure, a metal cone - cone sealing structure or a non-metallic cone - boss sealing structure, which can play the same sealing role.

[0064] The cryogenic solenoid valve in the embodiment of the present invention has a special structural design for cryogenic working conditions, including heat insulation design, clearance design, material design, etc.; moreover, the pilot valve core and the armature are the same part, and the main valve core and the piston are the same part. Compared with the structure where the pilot valve is actuated by an electromagnetic armature driving the pilot valve core and the main valve is actuated by a piston driving the main valve core, this structure is simpler and more reliable.

[0065] The cryogenic solenoid valve in this embodiment adopts a two-stage pilot structure, and the main valve uses a combined sealing ring structure to solve the problem of high-pressure cryogenic dynamic sealing;

[0066] The pilot valve solenoid valve is designed as a two-way three-way valve structure, supplemented by clearance heat insulation and material heat insulation designs, realizing the heat insulation structure of the solenoid valve, and minimizing the influence of the low-temperature medium flow on the electromagnet to the greatest extent, ensuring its reliable operation under low-temperature and high-pressure conditions;

[0067] In addition, it can also adapt to the working conditions of low-temperature and high-pressure gas media, has the characteristics of a wide temperature and pressure adaptation range, good medium and environmental adaptability, high working reliability, and a compact structure, and can meet the requirements of the development of new rockets. Embodiment Two

[0068] The present invention also provides a launch vehicle, and the launch vehicle adopts a cryogenic solenoid valve described in Embodiment One.

[0069] In the carrier rocket of this embodiment, the cryogenic solenoid valve adopts a two-stage pilot structure. The main valve uses a combined sealing ring structure to solve the problem of high-pressure cryogenic dynamic sealing. The pilot solenoid valve is designed as a two-way three-way valve structure, supplemented by gap heat insulation and material heat insulation designs, realizing the heat insulation structure of the solenoid valve, minimizing the influence of the cryogenic medium flow on the electromagnet to the greatest extent, and ensuring its reliable operation under low-temperature and high-pressure conditions. In addition, it can also adapt to the working conditions of cryogenic high-pressure gas media, has the characteristics of a wide temperature and pressure adaptation range, good medium and environmental adaptability, high working reliability, and a compact structure, and can meet the requirements for the development of new rockets.

[0070] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper, lower, inner, and outer" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first, second, or third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0071] Unless otherwise clearly specified and limited in the embodiments of the present invention, the terms "installation, connection, and coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection, an electrical connection, or a direct connection, and can also be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0072] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cryogenic solenoid valve, characterized in that: The cryogenic solenoid valve comprises a main valve and a pilot valve, wherein the pilot valve is arranged above the main valve; The pilot valve is a two-position three-way valve structure; A sealing gasket and a heat-insulating gap (A) are provided between the main valve and the pilot valve, wherein the sealing gasket is used for sealing between the pilot valve and the main valve, and the heat-insulating gap (A) is used for preventing heat conduction between the pilot valve and the main valve; The main valve and the pilot valve are both made of low-temperature resistant medium materials.

2. A cryogenic solenoid valve according to claim 1, characterized in that: The main valve comprises: the main valve comprises a main valve body (1), a main valve core (2), a main valve spring (3), a nozzle (10) and a first sealing ring (11); The main valve core (2) is installed in the inner cavity guide hole of the main valve body (1), and the first sealing ring (11) is provided on the main valve core (2); The main valve spring (3) is installed between the main valve core (2) and the bottom of the hole of the main valve body (1), a spring cavity is formed between the main valve spring (3), the main valve core (2) and the bottom of the hole of the main valve body (1), and a first medium flow channel (6) that can be connected to the pilot valve is arranged on the side of the spring cavity; The take-over nozzle (10) is installed outside the guide hole of the main valve core (2), and a valve seat is provided at the contact portion between the take-over nozzle (10) and the main valve core (2) for sealing between the take-over nozzle (10) and the main valve core (2).

3. A cryogenic solenoid valve according to claim 2, characterized in that: A sealing gasket is installed between the filler nozzle (10) and the main valve body (1), and the sealing gasket is squeezed when the filler nozzle (10) is connected to the main valve body (1).

4. A cryogenic solenoid valve according to claim 2, characterized in that: A plurality of annular grooves are arranged on the outer peripheral surface of the main valve core (2), respectively used for installing guide sealing rings.

5. A cryogenic solenoid valve according to claim 1, characterized in that: The pilot valve comprises: an electromagnetic assembly (8), a pilot valve core (14), an end cover (9), and a pilot valve spring (13); The electromagnetic assembly (8) is arranged on the main valve, a sealing ring and a heat-insulating gap (A) are arranged between the electromagnetic assembly (8) and the main valve, and the electromagnetic assembly (8) is connected to the main valve; The pilot valve core (14) is installed in the inner cavity guide hole of the electromagnetic assembly (8), and the pilot valve spring (13) is installed between the pilot valve core (14) and the bottom of the hole of the electromagnetic assembly (8); The end cover (9) is installed outside the guide hole of the pilot valve core (14), and an exhaust valve seat is provided at the contact portion between the end cover (9) and the pilot valve core (14) for exhaust sealing between the end cover (9) and the pilot valve core (14); An intake valve seat is provided at the lower end of the electromagnetic assembly (8) for intake sealing between the electromagnetic assembly (8) and the pilot valve core (14); a second medium flow channel (7) and a third medium flow channel (12) are provided inside and outside the intake valve seat, respectively; the second medium flow channel (7) is connected to the main valve, and the third medium flow channel (12) is connected to the medium inlet of the main valve body (1).

6. A cryogenic solenoid valve according to claim 5, characterized in that: The outer side surface of the guide valve core (14) is provided with a guide groove, and the guide groove is used for the medium to flow between the upper end surface and the lower end surfaces of the guide valve core (14).

7. A cryogenic solenoid valve according to claim 5, characterized in that: The end surface of the pilot valve core (14) in contact with the electromagnetic assembly (8) and the end surface of the pilot valve core (14) in contact with the end cover (9) are respectively provided with second sealing rings, which are used for sealing between the pilot valve core (14) and the electromagnetic assembly (8) and the end cover (9), respectively.

8. A cryogenic solenoid valve according to claim 5, characterized in that: A sealing gasket is installed between the end cover (9) and the electromagnetic assembly (8), and the sealing gasket is squeezed when the end cover (9) and the electromagnetic assembly (8) are connected.

9. A cryogenic solenoid valve according to claim 5, characterized in that: An exhaust hole and an exhaust one-way valve are provided at the opening of the end cover (9).

10. A cryogenic solenoid valve according to claim 9, characterized in that: The exhaust check valve comprises: a gland, a steel ball and an exhaust check valve spring; The steel ball is installed in the opening of the end cover (9) and is tightly sealed with the exhaust valve seat; the pressure cover is installed on the outside of the steel ball, and the exhaust check valve spring is installed between the pressure cover and the steel ball.

11. A launch vehicle, characterized in that: The launch vehicle adopts a cryogenic solenoid valve as described in any one of claims 1-10.

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