A circulating precooling valve for liquid rocket engines

Abstract

The application provides a circulating pre-cooling valve for a liquid rocket engine, comprising a valve body, a valve core, an elastic assembly, a valve seat, a cylinder flange and a bellows assembly, wherein the valve core and the bellows assembly are both slidingly installed in the valve body, the bellows assembly is connected with the valve core, the valve seat and the cylinder flange are respectively installed at two ends of the valve body, and two ends of the elastic assembly are respectively abutted with the valve core and the valve seat.

Description

Technical Field

[0001] This invention relates to the field of pre-cooling technology for liquid rocket engines, and more particularly to a circulating pre-cooling valve for liquid rocket engines. Background Technology

[0002] With the continuous development of aerospace technology, liquid rockets using liquid oxygen and liquid methane as propellants are becoming the future trend. Liquid rocket engines using liquid oxygen and liquid methane require propellant pre-cooling before ignition. Currently, liquid engine pre-cooling methods are divided into cyclic pre-cooling and exhaust pre-cooling. Exhaust pre-cooling wastes a large amount of propellant, while cyclic pre-cooling effectively saves propellant. Cyclic pre-cooling requires a valve that can recover propellant during pre-cooling and empty the propellant from the pipeline when pre-cooling stops. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a circulating precooling valve for liquid rocket engines, which addresses the shortcomings of the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A circulating precooling valve for a liquid rocket engine includes: a valve body, a valve core, an elastic component, a valve seat, a cylindrical flange, and a bellows assembly. The valve core and the bellows assembly are slidably installed in the valve body. The bellows assembly is connected to the valve core. The valve seat and the cylindrical flange are respectively installed at both ends of the valve body. The two ends of the elastic component abut against the valve core and the valve seat, respectively.

[0005] The beneficial effects of adopting the technical solution of this invention are that the valve controls the flow of air, changing the sealing side of the valve core, thereby controlling the medium to flow back or leak, achieving the purpose of propellant recovery or discharge. When air is not supplied, the valve core can seal with the valve body and valve seat under the action of the spring, and the propellant can be discharged. When air is supplied through the control port, the valve core seals with the valve seat, and the propellant can be collected, avoiding waste.

[0006] Furthermore, the valve body has an inlet and a return port on its side wall, the valve seat has a drain port, and the cylindrical flange has a control port. The inlet and the return port are connected to the connection point of the bellows assembly and the valve core. The drain port is connected to the valve core. A control cavity is formed between the outer wall of the bellows assembly and the inner wall of the cylindrical flange. The control port is connected to the control cavity.

[0007] The beneficial effects of adopting the above-mentioned further technical solution are that the return port is connected to the storage tank, the discharge port is connected to the discharge pipeline, and the control port can control the outlet of propellant flow. By opening and closing the valve through the control port, the sealing side of the valve core changes, thereby controlling the flow of the medium from the return port or the discharge port, achieving the purpose of propellant recovery or discharge. When the control port is closed, the valve core can seal with the valve body and valve seat under the action of the spring, and the propellant can be discharged from the discharge port. When the control port is open, the valve core seals with the valve seat under the action of the bellows assembly, and the propellant can be collected from the return port, avoiding waste.

[0008] Furthermore, the return port is connected to a storage tank, and the discharge port is connected to a discharge pipeline.

[0009] The beneficial effects of adopting the above-mentioned further technical solutions are that it facilitates the collection of propellant through the storage tank and the discharge of propellant through the discharge pipeline.

[0010] Furthermore, the bellows assembly includes: a guide rod, a bellows, and a guide sleeve. The guide sleeve is installed in the valve body, the guide rod is slidably installed in the guide sleeve, the guide rod is connected to the valve core, and both ends of the bellows abut against the guide rod and the guide sleeve, respectively.

[0011] The beneficial effect of adopting the above-mentioned further technical solution is that the bellows can compensate for the displacement of the guide rod and maintain a seal, preventing control gas from entering the valve. The bellows assembly is welded together from the guide rod, the bellows, and the guide sleeve, and has the functions of sealing and compensating for displacement.

[0012] Furthermore, the guide rod has a T-shaped connection structure on the side adjacent to the valve core, and the valve core has a T-shaped groove on the side adjacent to the guide rod, with the guide rod connected to the T-shaped groove; or the guide rod has a T-shaped groove on the side adjacent to the valve core, and the valve core has a T-shaped connection structure on the side adjacent to the guide rod, with the valve core connected to the T-shaped groove.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that the valve core and guide rod are connected by a T-shaped structure, which is convenient and reliable. This allows for selection of the T-shaped structure according to actual needs, improving applicability.

[0014] Furthermore, the elastic component includes a spring and a spring seat, the spring seat abutting against the valve seat, and both ends of the spring abutting against the spring seat and the valve core, respectively.

[0015] The beneficial effect of adopting the above-mentioned further technical solution is that a spring is installed in the groove of the valve core, and a spring seat is provided between the spring and the valve seat, so that the spring presses the valve core and achieves the sealing between the valve core and the valve body.

[0016] Furthermore, the side wall of the spring seat is provided with a plurality of holes, which are respectively connected to the valve core and the valve seat; the valve core is provided with a groove for installing the spring on the side adjacent to the valve seat, and the spring is installed in the groove.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is that the side of the spring seat is provided with multiple holes, which reduces the flow resistance of the spring seat.

[0018] Furthermore, the valve seat is provided with a valve seat non-metallic sealing surface, the valve core is provided with a valve core metallic sealing surface adapted to the valve seat non-metallic sealing surface on the side adjacent to the valve seat, the valve body is provided with a valve body metallic sealing surface, and the valve core is provided with a valve core non-metallic sealing surface adapted to the valve body metallic sealing surface on the side away from the valve seat.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that the end of the valve seat that contacts the valve core is provided with a non-metallic sealing surface. When the control port is vented, the valve core contacts the non-metallic sealing surface of the valve seat to achieve the sealing requirement. The valve body is provided with a metallic sealing surface, and one side of the valve core is provided with a non-metallic sealing surface. When the control port is de-vented, the non-metallic sealing surface of the valve core contacts the metallic sealing surface of the valve body to achieve the sealing requirement. One end of the valve core is a non-metallic sealing surface, and the other end is a metallic sealing surface, and both sides can seal with the sealing pair. The valve seat is provided with a non-metallic sealing surface, the valve body is provided with a metallic sealing surface, one side of the valve core is a non-metallic sealing surface, and the other side is a metallic sealing surface. When the control port is not vented, the valve core seals with the valve body under the action of the spring. When the control port is vented, the valve core slides to contact the valve seat under the action of the bellows assembly, and seals with the valve seat, thereby achieving control over whether the propellant is recovered or discharged.

[0020] Furthermore, the valve seat is connected to the valve body via a first fastener, and the cylindrical flange is connected to the valve body via a second fastener.

[0021] The beneficial effect of adopting the above-mentioned further technical solution is that the fastener setting facilitates a stable and detachable connection between the valve seat and the cylinder flange and the valve body, which is convenient for installation and maintenance.

[0022] Furthermore, a graphite gasket is installed between the valve body and the valve seat, and a conical gasket is installed between the cylindrical flange and the bellows assembly.

[0023] The beneficial effect of adopting the above-mentioned further technical solution is that a graphite sealing gasket is provided between the valve seat and the valve body to achieve a sealing function. A second fastener is used to press the conical sealing gasket against the cylindrical flange to achieve a seal.

[0024] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is one of the structural schematic diagrams of a circulating precooling valve for a liquid rocket engine provided in an embodiment of the present invention.

[0027] Figure 2 for Figure 1 The diagram shows a structure cut along section line AA.

[0028] Figure 3 This is a schematic diagram of the structure of the bellows assembly provided in an embodiment of the present invention.

[0029] Figure 4 This is the second schematic diagram of the structure of a circulating precooling valve for a liquid rocket engine provided in an embodiment of the present invention.

[0030] Reference numerals: 1. Valve body; 2. Valve core; 3. Spring; 4. Spring seat; 5. Graphite gasket; 6. Valve seat; 7. Conical gasket; 8. First fastener; 9. Second fastener; 10. Cylindrical flange; 11. Bellows assembly; 111. Guide rod; 112. Bellows; 113. Guide sleeve; 12. Inlet; 13. Return port; 14. Drain port; 15. Control port. Detailed Implementation

[0031] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present 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 the present invention.

[0036] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0037] This invention provides a circulating precooling valve for a liquid rocket engine, comprising: a valve body 1, a valve core 2, an elastic component, a valve seat 6, a cylindrical flange 10, and a bellows assembly 11. The valve core 2 and the bellows assembly 11 are slidably installed in the valve body 1. The bellows assembly 11 is connected to the valve core 2. The valve seat 6 and the cylindrical flange 10 are respectively installed at both ends of the valve body 1. The two ends of the elastic component abut against the valve core 2 and the valve seat 6, respectively.

[0038] The beneficial effects of adopting the technical solution of this invention are that the valve controls the flow of air, changing the sealing side of the valve core, thereby controlling the medium to flow back or leak, achieving the purpose of propellant recovery or discharge. When air is not supplied, the valve core can seal with the valve body and valve seat under the action of the spring, and the propellant can be discharged. When air is supplied through the control port, the valve core seals with the valve seat, and the propellant can be collected, avoiding waste.

[0039] The valve core can be a cuboid structure, and there is a gap between the valve core sidewall and the valve body.

[0040] Furthermore, the valve body 1 has an inlet 12 and a return port 13 on its side wall, the valve seat 6 has a discharge port 14, and the cylindrical flange 10 has a control port 15. The inlet 12 and the return port 13 are connected to the connection position of the bellows assembly 11 and the valve core 2. The discharge port 14 is connected to the valve core 2. A control cavity is formed between the outer wall of the bellows assembly 11 and the inner wall of the cylindrical flange 10. The control port 15 is connected to the control cavity.

[0041] The beneficial effects of adopting the above-mentioned further technical solution are that the return port is connected to the storage tank, the discharge port is connected to the discharge pipeline, and the control port can control the outlet of propellant flow. By opening and closing the valve through the control port, the sealing side of the valve core changes, thereby controlling the flow of the medium from the return port or the discharge port, achieving the purpose of propellant recovery or discharge. When the control port is closed, the valve core can seal with the valve body and valve seat under the action of the spring, and the propellant can be discharged from the discharge port. When the control port is open, the valve core seals with the valve seat under the action of the bellows assembly, and the propellant can be collected from the return port, avoiding waste.

[0042] Furthermore, the return port 13 is connected to a storage tank, and the discharge port 14 is connected to a discharge pipeline.

[0043] The beneficial effects of adopting the above-mentioned further technical solutions are that it facilitates the collection of propellant through the storage tank and the discharge of propellant through the discharge pipeline.

[0044] Furthermore, the bellows assembly 11 includes: a guide rod 111, a bellows 112, and a guide sleeve 113. The guide sleeve 113 is installed in the valve body 1, the guide rod 111 is slidably installed in the guide sleeve 113, the guide rod 111 is connected to the valve core 2, and the two ends of the bellows 112 abut against the guide rod 111 and the guide sleeve 113, respectively.

[0045] The beneficial effect of adopting the above-mentioned further technical solution is that the bellows can compensate for the displacement of the guide rod and maintain a seal, preventing control gas from entering the valve. The bellows assembly is welded together from the guide rod, the bellows, and the guide sleeve, and has the functions of sealing and compensating for displacement.

[0046] The guide sleeve 113 may be provided with a through hole.

[0047] Furthermore, the guide rod 111 has a T-shaped connection structure on the side adjacent to the valve core 2, and the valve core 2 has a T-shaped groove on the side adjacent to the guide rod 111, with the guide rod 111 connected to the T-shaped groove; or the guide rod 111 has a T-shaped groove on the side adjacent to the valve core 2, and the valve core 2 has a T-shaped connection structure on the side adjacent to the guide rod 111, with the valve core 2 connected to the T-shaped groove.

[0048] The beneficial effect of adopting the above-mentioned further technical solution is that the valve core and guide rod are connected by a T-shaped structure, which is convenient and reliable. This allows for selection of the T-shaped structure according to actual needs, improving applicability.

[0049] Furthermore, the elastic component includes a spring 3 and a spring seat 4, the spring seat 4 abutting against the valve seat 6, and the two ends of the spring 3 abutting against the spring seat 4 and the valve core 2 respectively.

[0050] The beneficial effect of adopting the above-mentioned further technical solution is that a spring is installed in the groove of the valve core, and a spring seat is provided between the spring and the valve seat, so that the spring presses the valve core and achieves the sealing between the valve core and the valve body.

[0051] Furthermore, the side wall of the spring seat 4 is provided with a plurality of holes, which are respectively connected to the valve core 2 and the valve seat 6; the valve core 2 is provided with a groove for installing the spring 3 on the side adjacent to the valve seat 6, and the spring 3 is installed in the groove.

[0052] The beneficial effect of adopting the above-mentioned further technical solution is that the side of the spring seat is provided with multiple holes, which reduces the flow resistance of the spring seat.

[0053] Furthermore, the valve seat 6 is provided with a valve seat non-metallic sealing surface, the valve core 2 is provided with a valve core metallic sealing surface adapted to the valve seat non-metallic sealing surface on the side adjacent to the valve seat 6, the valve body 1 is provided with a valve body metallic sealing surface, and the valve core 2 is provided with a valve core non-metallic sealing surface adapted to the valve body metallic sealing surface on the side away from the valve seat 6.

[0054] The beneficial effect of adopting the above-mentioned further technical solution is that the end of the valve seat that contacts the valve core is provided with a non-metallic sealing surface. When the control port is vented, the valve core contacts the non-metallic sealing surface of the valve seat to achieve the sealing requirement. The valve body is provided with a metallic sealing surface, and one side of the valve core is provided with a non-metallic sealing surface. When the control port is de-vented, the non-metallic sealing surface of the valve core contacts the metallic sealing surface of the valve body to achieve the sealing requirement. One end of the valve core is a non-metallic sealing surface, and the other end is a metallic sealing surface, and both sides can seal with the sealing pair. The valve seat is provided with a non-metallic sealing surface, the valve body is provided with a metallic sealing surface, one side of the valve core is a non-metallic sealing surface, and the other side is a metallic sealing surface. When the control port is not vented, the valve core seals with the valve body under the action of the spring. When the control port is vented, the valve core slides to contact the valve seat under the action of the bellows assembly, and seals with the valve seat, thereby achieving control over whether the propellant is recovered or discharged.

[0055] Furthermore, the valve seat 6 is connected to the valve body 1 via a first fastener 8, and the cylindrical flange 10 is connected to the valve body 1 via a second fastener 9.

[0056] The beneficial effect of adopting the above-mentioned further technical solution is that the fastener setting facilitates a stable and detachable connection between the valve seat and the cylinder flange and the valve body, which is convenient for installation and maintenance.

[0057] Furthermore, a graphite gasket 5 is installed between the valve body 1 and the valve seat 6, and a conical gasket 7 is installed between the cylindrical flange 10 and the bellows assembly 11.

[0058] The beneficial effect of adopting the above-mentioned further technical solution is that a graphite sealing gasket is provided between the valve seat and the valve body to achieve a sealing function. A second fastener is used to press the conical sealing gasket against the cylindrical flange to achieve a seal.

[0059] This invention provides a circulating precooling valve for a liquid rocket engine. The circulating precooling valve for a liquid rocket engine adopts a three-way structure, with one inlet 12, two outlets (return port 13 and vent port 14), and one control port 15. The return port 13 is connected to a storage tank, and the vent port 14 is connected to a discharge pipeline. The valve is opened and closed through the control port 15, changing the sealing side of the valve core 2, thereby controlling the flow of the medium from the return port 13 or the vent port 14, achieving the purpose of propellant recovery or discharge.

[0060] The circulating precooling valve for a liquid rocket engine used in this invention includes a valve body 1, a valve core 2, a spring 3, a spring seat 4, a bellows assembly 11, and a valve seat 6, etc.

[0061] Furthermore, the circulating precooling valve adopts a three-way structure, with one inlet 12, two outlets (return port 13 and discharge port 14) and one control port 15. The return port 13 is connected to the storage tank, the discharge port 14 is connected to the discharge pipeline, and the control port 15 can control the outlet of the propellant flow.

[0062] Furthermore, the end of the valve seat 6 that contacts the valve core 2 is provided with a non-metallic sealing surface. When the control port 15 is vented, the valve core 2 contacts the non-metallic sealing surface of the valve seat to achieve the sealing requirement.

[0063] Furthermore, the valve body 1 is provided with a metal valve seat (metal sealing surface), and the valve core 2 is provided with a non-metal sealing surface on one side. When the air is released from the control port 15, the non-metal sealing surface of the valve core 2 contacts the metal sealing surface of the valve body 1 to achieve the sealing requirement.

[0064] Furthermore, one end of the valve core 2 is a non-metallic sealing surface, and the other end is a metallic sealing surface, both of which can seal with the sealing pair.

[0065] Furthermore, one end of the valve core 2 is provided with a T-slot, and the guide rod 111 of the bellows assembly 11 has a T-shaped connection structure. Alternatively, the guide rod 111 of the bellows assembly 11 has a T-shaped structure, and the valve core 2 has a T-shaped connection structure.

[0066] Furthermore, the bellows assembly 11 consists of a bellows 112, a guide rod 111, and a guide sleeve 113. When the control port 15 is vented, the guide rod 111 is compressed and moved. The bellows 112 can compensate for the displacement of the guide rod 111 and maintain a seal to prevent control air from entering the valve.

[0067] Furthermore, the side of the spring seat 4 is provided with multiple holes to reduce the flow resistance of the spring seat 4.

[0068] This invention provides a circulating precooling valve for a liquid rocket engine. The circulating precooling valve adopts a three-way structure, with one inlet 12, two outlets (return port 13 and vent port 14), and one control port 15. The return port 13 is connected to a storage tank, the vent port 14 is connected to a discharge pipeline, and the control port 15 controls the outlet of propellant flow. When the control port 15 is closed, the valve core 2 can be sealed with the valve seat under the action of a spring, and the propellant can be discharged from the vent port 14. When the control port 15 is open, the valve core 2 is sealed with the valve seat 6 under the action of the bellows assembly 11, and the propellant can be collected from the return port 13 to avoid waste.

[0069] Example 1 like Figures 1-3 As shown, an embodiment of the present invention provides a circulating precooling valve for a liquid rocket engine, comprising: a valve body 1 serving as the support and mounting base for other components; a bellows assembly 11, a conical sealing gasket 7, and a cylindrical flange 10 sequentially installed within the valve body 1, with the cylindrical flange 10 pressing against the conical sealing gasket 7 via a second fastener 9 to achieve sealing; a valve core 2 having a T-groove, which is aligned with the T-shaped structure of the guide rod 111 in the bellows assembly 11, then inserted into the valve body 1 and rotated 90°; a spring 3 is installed in the groove of the valve core 2, and a spring seat 4 is provided between the spring 3 and the valve seat 6, so that the spring 3 presses against the valve core 2 to achieve sealing between the valve core 2 and the valve body 1; the valve seat 6 is installed on the valve body 1 via a first fastener 8, and a graphite sealing gasket 5 is provided between the valve seat 6 and the valve body 1 to achieve sealing; the bellows assembly 11 is welded together from the guide rod 111, the bellows 112, and the guide sleeve 113.

[0070] In some implementations, such as Figure 1 As shown, it has one inlet 12, two outlets (return port 13 and discharge port 14) and one control port 15. The return port 13 is connected to the storage tank, the discharge port 14 is connected to the discharge pipeline, and the control port 15 can control the outlet of the propellant flow.

[0071] In some implementations, such as Figure 3 As shown, the bellows assembly 11 is welded together from the guide rod 111, the bellows 112 and the guide sleeve 113, and has the functions of sealing and compensating for displacement.

[0072] In some implementations, the valve core 1 and the guide rod 111 are connected by a T-shaped structure, which is convenient and reliable.

[0073] In some embodiments, the spring seat 4 has multiple holes on its side to reduce the flow resistance of the spring seat.

[0074] In some embodiments, the valve seat 6 has a non-metallic sealing surface, the valve body 1 has a metallic sealing surface, and the valve core 2 has a non-metallic sealing surface on one side and a metallic sealing surface on the other side. When the control port is not vented, the valve core 2 is sealed to the valve body 1 under the action of the spring 3. When the control port is vented, the valve core 2 slides to contact the valve seat 6 under the action of the bellows assembly 11 and seals with the valve seat 6, thereby controlling whether the propellant is recovered or discharged.

[0075] The working process of a circulating precooling valve for a liquid rocket engine provided in this embodiment of the invention is as follows: Figure 1 As shown, the circulating precooling valve is in the venting state, control port 15 is not vented, and the non-metallic sealing surface of valve core 2 contacts and seals with the metallic sealing surface of valve body 1 under the action of spring 3. At this time, propellant flows in from inlet 12, passes through the cavity between valve core 2 and housing 1, flows through spring seat 4, and flows out from vent outlet 14 of valve seat 6, thus venting the propellant. Figure 4 As shown, when the circulating precooling valve is in the recovery state, the control port 15 is vented, and the guide rod 111 in the bellows assembly 11 is displaced, pushing the valve core 2 to slide within the valve body 1. This causes the metal sealing surface of the valve core 2 to press against the non-metallic sealing surface of the valve seat 6. At this time, the propellant flows in from the inlet 12 and is recovered from the return port 13 of the valve body 1. When recovery is no longer needed, the gas at the control port 15 is removed, and the circulating precooling valve returns to normal. Figure 1 The state shown.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circulating precooling valve for a liquid rocket engine, characterized in that, include: The valve body (1), valve core (2), elastic component, valve seat (6), cylindrical flange (10) and bellows assembly (11) are slidably installed in the valve body (1). The bellows assembly (11) is connected to the valve core (2). The valve seat (6) and the cylindrical flange (10) are respectively installed at both ends of the valve body (1). The two ends of the elastic component abut against the valve core (2) and the valve seat (6) respectively.

2. The circulating precooling valve for a liquid rocket engine according to claim 1, characterized in that, The valve body (1) has an inlet (12) and a return port (13) on its side wall. The valve seat (6) has a drain port (14). The cylindrical flange (10) has a control port (15). The inlet (12) and the return port (13) are connected to the bellows assembly (11) and the valve core (2) at the connection position. The drain port (14) is connected to the valve core (2). A control cavity is formed between the outer wall of the bellows assembly (11) and the inner wall of the cylindrical flange (10). The control port (15) is connected to the control cavity.

3. A circulating precooling valve for a liquid rocket engine according to claim 2, characterized in that, The return port (13) is connected to a storage tank, and the discharge port (14) is connected to a discharge pipeline.

4. A circulating precooling valve for a liquid rocket engine according to claim 1, characterized in that, The bellows assembly (11) includes a guide rod (111), a bellows (112), and a guide sleeve (113). The guide sleeve (113) is installed in the valve body (1). The guide rod (111) is slidably installed in the guide sleeve (113). The guide rod (111) is connected to the valve core (2). The two ends of the bellows (112) abut against the guide rod (111) and the guide sleeve (113), respectively.

5. A circulating precooling valve for a liquid rocket engine according to claim 4, characterized in that, The guide rod (111) has a T-shaped connection structure on the side adjacent to the valve core (2), and the valve core (2) has a T-shaped groove on the side adjacent to the guide rod (111). The guide rod (111) is connected to the T-shaped groove. Alternatively, the guide rod (111) has a T-shaped groove on the side adjacent to the valve core (2), and the valve core (2) has a T-shaped connection structure on the side adjacent to the guide rod (111). The valve core (2) is connected to the T-shaped groove.

6. A circulating precooling valve for a liquid rocket engine according to claim 1, characterized in that, The elastic component includes a spring (3) and a spring seat (4), the spring seat (4) abutting against the valve seat (6), and the two ends of the spring (3) abutting against the spring seat (4) and the valve core (2) respectively.

7. A circulating precooling valve for a liquid rocket engine according to claim 6, characterized in that, The side wall of the spring seat (4) is provided with a plurality of holes, which are respectively connected to the valve core (2) and the valve seat (6); the valve core (2) is provided with a groove for installing the spring (3) on the side adjacent to the valve seat (6), and the spring (3) is installed in the groove.

8. A circulating precooling valve for a liquid rocket engine according to claim 1, characterized in that, The valve seat (6) is provided with a valve seat non-metallic sealing surface. The valve core (2) is provided with a valve core metal sealing surface that is adapted to the valve seat non-metallic sealing surface on the side adjacent to the valve seat (6). The valve body (1) is provided with a valve body metal sealing surface. The valve core (2) is provided with a valve core non-metallic sealing surface that is adapted to the valve body metal sealing surface on the side away from the valve seat (6).

9. A circulating precooling valve for a liquid rocket engine according to claim 1, characterized in that, The valve seat (6) is connected to the valve body (1) by a first fastener (8), and the cylindrical flange (10) is connected to the valve body (1) by a second fastener (9).

10. A circulating precooling valve for a liquid rocket engine according to claim 1, characterized in that, A graphite gasket (5) is installed between the valve body (1) and the valve seat (6), and a conical gasket (7) is installed between the cylindrical flange (10) and the bellows assembly (11).

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