Combination valve, rocket engine and launch vehicle thereof

Abstract

The application relates to a combined valve, a rocket engine and a carrier rocket thereof, the combined valve comprising a shell structure assembly, a first shell structure and a second shell structure, the first shell structure being provided with a liquid inlet, a liquid outlet and a first channel; the second shell structure being arranged on the first shell structure, the axial direction of the first shell structure being perpendicular to the axial direction of the second shell structure; the second shell structure being provided with a second channel along the axial direction of the second shell structure, the second channel being communicated with the first channel; the first shell structure being provided with a liquid leakage hole along the radial direction of the first shell structure; a valve seat assembly being arranged in the first channel, the valve seat assembly being movable along the axial direction of the first shell structure between a first position and a second position of the first channel; a flow regulating assembly comprising a regulating valve core, the regulating valve core being arranged in the second channel and the first channel; the regulating valve core being provided with a flow hole; the regulating valve core being rotatable around the axial direction of the second shell structure so as to adjust the communication area of the flow hole and the first channel, and further change the effective flow area and the flow resistance of the working medium.

Description

Technical Field

[0001] This application relates to the field of aerospace technology, and in particular to combination valves, rocket engines and their launch vehicles. Background Technology

[0002] With the rapid development of aerospace, rocket engines using fluid propellants have become one of the main choices for the propulsion systems of launch vehicles. In the propellant supply system of a rocket engine, valves, as core components controlling the on / off state, flow rate, and pressure of the propellant, directly determine the engine's operational stability and mission success rate.

[0003] In related technologies, the valve system of rocket engines often adopts a design concept of single function and decentralized arrangement. Independent valves are set up for different functions, such as main propellant supply, precooling, purging, and safety overflow. These valves are connected to engine injectors, pump chambers and other components through a complex pipeline network.

[0004] However, the aforementioned functional valves are distributed in different locations on the engine, requiring a large number of connecting pipes for bridging. These pipes and their connecting flanges occupy the engine's installation space, and the weight of the pipes themselves increases the engine's dead weight, which is not conducive to improving the rocket's thrust-to-weight ratio and payload capacity.

[0005] Complex piping connections involve numerous flanges, joints, and welds. Under the extreme conditions of high pressure, strong vibration, and cryogenic temperatures in rocket engines, each connection point is a potential leak point or seepage channel. The increased number of sealing points significantly reduces the overall reliability of the system, and once a leak occurs, locating the fault is extremely difficult.

[0006] Long and winding pipes increase propellant flow resistance, leading to significant pressure losses, wasting energy, and increasing fluid heating. More importantly, the increased pipe volume increases fluid inertia, resulting in longer valve response times, making it difficult to meet the demands of modern rocket engines for rapid thrust shifting and precise shutdown.

[0007] During the assembly, disassembly, or maintenance of the engine, the complex piping disassembly and assembly can easily generate metal shavings, sealant residue, and other foreign matter. If this foreign matter enters the precision valves or pumps, it can lead to catastrophic failures. In addition, the decentralized structure means that engine maintenance and valve replacement require the disassembly of a large number of pipelines, making maintenance procedures cumbersome and time-consuming, which is not conducive to realizing the design concept of reusable and rapid maintenance of rocket engines. Summary of the Invention

[0008] Based on this, a combined valve, a rocket engine, and a launch vehicle are provided, which can meet the requirements of rocket engines for high reliability, lightweight, and rapid maintenance.

[0009] A combination valve, comprising:

[0010] A shell structure assembly includes a first shell structure and a second shell structure. The first shell structure has a liquid inlet, a liquid outlet, and a first channel connecting the liquid inlet and the liquid outlet. The second shell structure is inserted through the first shell structure, and the axial direction of the first shell structure is at a predetermined angle to the axial direction of the second shell structure. The second shell structure has a second channel along its axial direction, and the second channel is connected to the first channel. The first shell structure has a drain outlet along its radial direction, and the drain outlet is located close to the liquid inlet.

[0011] A valve seat assembly, disposed within the first channel, is movable along the axial direction of the first housing structure between a first position and a second position within the first channel; and

[0012] A flow regulation assembly includes a regulating valve core disposed in a second channel and a first channel; wherein the regulating valve core has an overflow orifice; wherein the regulating valve core is rotatable about the axial direction of the second shell structure to adjust the communication area between the overflow orifice and the first channel, thereby changing the effective flow area and flow resistance of the working medium;

[0013] When the valve seat assembly is in the first position, the valve seat assembly is configured to block the drain port, and the valve seat assembly is spaced apart from the regulating valve core; when the valve seat assembly is in the second position, the flow hole is staggered from the sealing position of the valve seat assembly, the valve seat assembly abuts against the regulating valve core to block the first channel, and the valve seat assembly is staggered from the drain port to open the drain port.

[0014] In one embodiment, the valve seat assembly includes a valve seat, a first sealing portion, a second sealing portion, and an elastic element, wherein the first sealing portion and the second sealing portion are located on opposite sides along the axial direction of the first housing structure;

[0015] When the valve seat is in the first position, the valve seat is sealed to the first shell structure through the first sealing part; when the valve seat is in the second position, the valve seat is sealed to the first shell structure through the second sealing part.

[0016] The elastic element is connected to the valve seat, and the preload of the elastic element is set to drive the valve seat to move closer to the regulating valve core.

[0017] In one embodiment, the elastic element includes at least one elastic drive portion;

[0018] The inner wall of the first shell structure is provided with a first groove communicating with the first channel; at least a portion of the structure of the first sealing part and at least a portion of the structure of the second sealing part are disposed in the first groove;

[0019] The circumferential outer wall of the valve seat is formed with a first protrusion extending into the first groove;

[0020] The elastic drive portion is sandwiched between the first boss and the first sealing portion, and the elastic drive portion is configured to push against the valve seat through the first boss, causing the valve seat to abut against the regulating valve core; or...

[0021] The elastic drive unit is sandwiched between the first boss and the second sealing part, and the elastic drive unit is configured to pull the valve seat through the first boss so that the valve seat abuts against the regulating valve core.

[0022] In one embodiment, the valve seat assembly further includes at least one limiting rod, which is fixedly connected to the first boss;

[0023] The elastic drive unit is limited by the limiting rod, and the limiting rod is configured to restrict the deformation path of the elastic drive unit; wherein, the axial length of the limiting rod is less than the axial length of the elastic drive unit in its free state.

[0024] In one embodiment, the first shell structure has an air control port, which is connected to the first channel;

[0025] A pressure chamber is formed between the inner circumference of the first channel and the outer circumference of the valve seat assembly. The pressure chamber is connected to the pneumatic control port. The control air pressure entering the pressure chamber drives the valve seat assembly to move towards the liquid inlet, overcoming the elastic force of the elastic drive part.

[0026] In one embodiment, the valve seat is fitted with sealing bodies at both ends along the axial direction of the first housing structure, the sealing bodies being made of non-metallic sealing material.

[0027] In one embodiment, the first shell structure includes a first flange and a first shell, wherein the first flange is sealed to the first shell;

[0028] The inlet is located on the first flange, and the first channel is located between the first flange and the first housing. The first housing has a drain port, and the outlet is located on the first housing. The outlet forms a working medium channel and is used to discharge the working medium leaking through the adjacent sealing body. The outlet, the first channel, and the outlet are coaxially arranged.

[0029] The drain port is located on the first flange and is used to discharge the precooling medium.

[0030] In one embodiment, the second shell structure includes a second flange and a second shell, the second shell and the second flange being disposed on opposite sides of the first shell, and the second flange and the second shell being respectively sealed to the first shell;

[0031] The second flange has a blow-out port, which communicates with the second channel; wherein, the second channel is formed on the second flange and the second housing;

[0032] The purge port is used to purge the propellant inside the combined valve and downstream after the engine is stopped;

[0033] The first housing has a first opening and a second opening opposite to each other. The first opening connects the first channel and the second channel on the second housing, and the second opening connects the second channel on the second flange and the first channel.

[0034] In one embodiment, the regulating valve core includes a first connecting section, an regulating body, and a second connecting section. The first connecting section and the second connecting section are respectively disposed on both sides of the regulating body. The regulating body is disposed in the first channel, and the first connecting section and the second connecting section are respectively disposed in the second channel.

[0035] The regulating body has a spherical structure, and the flow passage is opened at the center of the regulating body; the regulating body can rotate around the axis of the second shell structure, and the regulating body changes the overlapping area of ​​the flow passage and the first channel by changing the rotation angle; wherein, when the valve seat assembly abuts against the spherical area of ​​the regulating body, the first channel is blocked;

[0036] Both the second connecting section and the first connecting section are provided with auxiliary flow channels. The auxiliary flow channels are coaxial with and connected to the second channel, and the auxiliary flow channels connect the flow holes and the second channel.

[0037] In one embodiment, the flow regulation component includes a regulation drive unit disposed in the second housing structure, and the drive end of the regulation drive unit is connected to the first connecting segment;

[0038] The regulating drive unit is configured to drive the regulating valve core to rotate about the axial direction of the second housing structure.

[0039] In one embodiment, the adjustment drive unit includes a first drive body and a drive shaft. The first drive body is connected to the second housing structure. The drive end of the first drive body is rotatably inserted into the second channel and fixedly connected to one end of the drive shaft. The other end of the drive shaft is fixedly connected to the first connecting section.

[0040] In one embodiment, a sealing structure is provided between the drive shaft and the inner wall of the second channel.

[0041] In one embodiment, an isolation pad layer is sandwiched between the first drive body and the second shell structure, the isolation pad layer being made of a non-metallic sealing material.

[0042] In one embodiment, the flow regulating assembly includes a first bushing, a locking pin, and a second bushing;

[0043] The first bushing is rotatably disposed in the second channel, one end of the first bushing is sleeved on the first connecting section, and the other end of the first bushing is sleeved on the drive shaft;

[0044] The locking pin passes through the first bushing and the drive shaft to achieve axial locking;

[0045] The second bushing is fitted onto the second connecting section.

[0046] In one embodiment, the flow regulating component includes an regulating pad, and the regulating pad is sleeved on both the first connecting segment and the second connecting segment;

[0047] The adjusting pad is configured for installation position adjustment such that the horizontal plane containing the flow hole axis of the regulating valve core coincides with the axis of the valve seat assembly.

[0048] In one embodiment, a flange is provided at the connection between the adjusting body and the first connecting segment, and at the connection between the adjusting body and the second connecting segment; the adjusting pad located in the first connecting segment is sandwiched between the first bushing and the corresponding flange; the adjusting pad located in the second connecting segment is sandwiched between the second bushing and the corresponding flange.

[0049] A rocket engine includes a combination valve as described above and a medium system, the medium system including a medium supply unit connected to the inlet of the combination valve.

[0050] A launch vehicle, comprising the rocket engine as described above.

[0051] The aforementioned combined valve, rocket engine, and launch vehicle integrate the valve seat assembly and flow regulation assembly within the same shell structure assembly. Furthermore, the first shell structure and the second shell structure are perpendicularly connected, forming a compact flow channel layout. This integrated design significantly reduces the number of connecting pipes, flanges, and joints, and substantially reduces the volume and dead weight of the valve system, thereby improving the thrust-to-weight ratio and payload capacity of the launch vehicle.

[0052] The integrated design reduces the number of intermediate connecting pipelines, eliminating the numerous flanges, joints, and welds required for pipeline bridging in related technologies. Under the extreme conditions of high pressure, strong vibration, and deep cryogenics in rocket engines, the significant reduction in sealing points directly lowers the risk of media leakage. Simultaneously, the integrated shell structure design reduces potential seepage channels, making the sealing performance of the entire propellant supply system easier to control and ensure.

[0053] The second channel is directly connected to the first channel, and the valve seat assembly cooperates with the regulating valve core to achieve the switching and adjustment of the flow path. Compared with long and winding pipelines, the flow path disclosed in this invention is short and smooth, which significantly reduces the propellant flow resistance and pressure loss, and reduces energy waste and fluid heating. In addition, the reduction in flow path volume reduces fluid inertia, allowing the action of the valve seat assembly and the rotation of the regulating valve core to affect the fluid state more quickly, thereby significantly shortening the valve response time and meeting the requirements of modern rocket engines for rapid thrust change and precise shutdown.

[0054] The axial movement of the valve seat assembly enables the switching between two functional states. When the valve seat assembly is in the first position, the drain port is blocked, and the medium can flow out from the outlet after being regulated by the regulating valve core. When the valve seat assembly is in the second position, the valve seat assembly abuts against the regulating valve core to block the first channel, while the valve seat assembly is offset from the drain port to open the drain port. This mechanical linkage design eliminates the need for additional drive mechanisms to separately control the main valve and the pressure relief valve, simplifying the complexity of the control system and avoiding the risk of malfunction that might result from separate operation. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the structure of a combination valve in an exemplary embodiment.

[0056] Figure 2 This is a cross-sectional schematic diagram of a combination valve in an exemplary embodiment.

[0057] Figure 3 This is a cross-sectional schematic diagram of a combination valve in an exemplary embodiment.

[0058] Figure 4 This is a cross-sectional schematic diagram of a combination valve in an exemplary embodiment.

[0059] Figure 5This is a cross-sectional schematic diagram of a combination valve in an exemplary embodiment.

[0060] Figure 6 This is a schematic diagram of the structure of a regulating valve core in an exemplary embodiment.

[0061] Figure 7 This is a cross-sectional schematic diagram of the valve seat assembly in a first position according to an exemplary embodiment.

[0062] Figure 8 This is a cross-sectional schematic diagram showing the angle between the axis of the flow-through orifice and the axis of the first channel being 0° in an exemplary embodiment.

[0063] Figure label:

[0064] 1. Shell structure assembly; 11. First shell structure; 111. First flange; 1111. Liquid inlet; 1112. Liquid outlet; 1113. Drain outlet; 1114. First groove; 11141. First stepped surface; 11142. Second stepped surface; 112. First shell; 1121. First channel; 1122. First opening; 1123. Second opening; 1124. Pneumatic control port; 1125. Drain outlet; 113. First sealing gasket; 12. Second shell structure; 121. Second shell; 1211. Second channel; 1212. Drain outlet; 1221. Purge port; 122. Second flange; 123. Second sealing gasket; 13. Connecting nozzle;

[0065] 2. Valve seat assembly; 21. Valve seat; 211. First boss; 2111. First insertion groove; 21111. Second protrusion; 212. Sealing body; 213. Embedding groove; 22. First sealing part; 221. First elastic retaining ring; 2211. First ring body; 22111. First main body; 22112. First clamping arm; 2212. Second ring body; 222. First spring energy storage sealing ring; 2221. First receiving groove; 23. Second sealing part; 231. First sub-sealing part; 2311. Second elastic retaining ring; 2312. Second spring-energy-storing sealing ring; 2313. First washer; 232. Second sub-sealing part; 2321. Second washer; 2322. Third spring-energy-storing sealing ring; 2323. Third elastic retaining ring; 24. Elastic element; 241. Elastic drive part; 25. Limiting rod; 251. First insertion block; 2511. First protrusion;

[0066] 3. Flow regulating assembly; 31. Regulating valve core; 311. First connecting section; 312. Regulating body; 3121. Bushing; 31211. Positioning pin; 3122. Flow hole; 313. Second connecting section; 3131. Auxiliary flow channel; 314. Flange; 32. Regulating drive unit; 321. First drive body; 322. Drive shaft; 323. Third bushing; 324. First tapered roller bearing; 325. Isolation pad; 33. Sealing structure; 331. Third sealing part; 3311. Third washer; 3312. Fourth spring energy storage seal ring; 3313. Fourth elastic retaining ring; 34. First bushing; 341. Second tapered roller bearing; 35. Locking pin; 36. Second bushing; 361. Third tapered roller bearing; 37. Regulating pad. Detailed Implementation

[0067] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0068] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0069] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0071] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" 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. Similarly, "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.

[0072] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0073] In some exemplary embodiments, such as Figures 1-4 As shown, a combined valve is used in a rocket engine. The combined valve includes a shell structure assembly 1, a valve seat assembly 2, and a flow regulating assembly 3.

[0074] The shell structure assembly 1 serves as the main frame, providing installation space for the valve seat assembly 2 and the flow regulating assembly 3. The shell structure assembly 1 includes a first shell structure 11 and a second shell structure 12.

[0075] For example, such as Figures 1-3 As shown, the first shell structure 11 includes a first flange 111 and a first shell 112. The first flange 111 and the first shell 112 are fixedly connected by bolts, and a first sealing gasket 113 is provided between the first flange 111 and the first shell 112 to ensure the sealing of the connection and prevent leakage of the working medium.

[0076] The first housing structure 11 has a liquid inlet 1111, a liquid outlet 1112, and a first channel 1121 connecting the liquid inlet 1111 and the liquid outlet 1112. For example, the liquid inlet 1111 is located on the first flange 111 and is used to introduce the cryogenic precooling medium and the working medium. The first channel 1121 is located on the first flange 111 and the first housing 112 and is the main flow path of the working medium. The liquid outlet 1112 is located on the first housing 112 and is used to form a working medium channel. The liquid inlet 1111, the first channel 1121, and the liquid outlet 1112 are coaxially arranged to discharge the working medium to drive the engine.

[0077] The first housing 112 has a drain port 1125, which is used to discharge the working medium leaking through the adjacent sealing body 212 (described in detail later). The drain port 1125 is not limited to one; one or more can be provided. When multiple drain ports 1125 are provided, they can be located in different positions to improve the discharge effect of the working medium under specific conditions (such as after use). The first flange 111 has a drain port 1113, located near the inlet 1111, for discharging the pre-cooling medium. During the engine pre-cooling stage, the low-temperature pre-cooling medium enters from the inlet 1111 and exits through the drain port 1113, achieving pre-cooling of the engine components.

[0078] The second shell structure 12 is mounted on the first shell structure 11, and the axial direction of the first shell structure 11 is at a predetermined angle to the axial direction of the second shell structure 12. For example, the predetermined angle is 90°, making the first shell structure 11 and the second shell structure 12 perpendicular to each other. Exemplarily, the second shell structure 12 includes a second flange 122 and a second shell 121, which are respectively disposed on both sides of the first shell 112. The second flange 122 and the second shell 121 are respectively fixedly connected to the first shell 112 by bolts, and a second sealing gasket 123 is provided at the connection point to ensure a tight seal.

[0079] The second shell structure 12 has a second channel 1211 along its axial direction. The second channel 1211 passes through the second flange 122 and the second shell 121, and communicates with the first channel 1121. For example, the first shell 112 has a first opening 1122 and a second opening 1123. The first opening 1122 connects the first channel 1121 and the second channel 1211 on the second shell 121, and the second opening 1123 connects the second channel 1211 on the second flange 122 and the first channel 1121. The second channel 1211 provides space for the installation of the flow regulating assembly 3 and the flow of the working medium.

[0080] The second flange 122 has a purge port 1221, which is used to purge the propellant inside the combination valve and downstream after the engine is shut down. For example, the purge port 1221 is connected to the second channel 1211. When the engine needs to be purged and purged, the purging gas enters from the purge port 1221, passes through the second channel 1211 and the first channel 1121 to purge the relevant parts of the engine, and flows out through the liquid outlet 1112. In addition, the second housing 121 may also have a discharge port 1212, which is located on the side of the second housing 121 away from the purge port 1221. The discharge port 1212 can be used to vent gas and also to discharge leaked working medium.

[0081] It should be noted that at least one of the above-mentioned drain port 1125, outlet port 1112, drain port 1113, inlet port 1111, and purging port 1221 is equipped with a connecting nozzle 13. The connecting nozzle 13 serves as an intermediate component connecting the combined valve to external pipelines (such as propellant delivery pipelines, purging gas pipelines, or discharge pipelines). Its main function is to achieve a transitional connection of the fluid passage and facilitate the modular installation and disassembly of the combined valve.

[0082] In this embodiment, as Figure 2 , Figure 4 As shown, the valve seat assembly 2 is disposed in the first channel 1121 and can move between a first position and a second position along the axial direction of the first housing structure 11.

[0083] When the valve seat assembly 2 is in the first position close to the inlet 1111, the valve seat assembly 2 blocks the drain port 1113 to prevent the precooling medium from leaking from the drain port 1113. At the same time, the valve seat assembly 2 and the regulating valve core 31 are spaced apart, and the working medium can enter the first channel 1121 from the inlet 1111.

[0084] When the valve seat assembly 2 moves to the second position near the outlet 1112, the valve seat assembly 2 abuts against the regulating valve core 31, blocking the first channel 1121 and preventing the working medium from continuing to flow forward. At the same time, the valve seat assembly 2 is offset from the drain port 1113, opening the drain port 1113. At this time, the precooling medium or residual working medium can be discharged according to the engine's working requirements.

[0085] In this embodiment, as Figure 2 , Figure 5 As shown, the flow regulation component 3 includes a regulating valve core 31, which is disposed in the second channel 1211 and the first channel 1121. The regulating valve core 31 has a flow passage 3122, the shape and size of which can be designed according to actual needs, such as circular or elliptical, to achieve different flow regulation effects.

[0086] The regulating valve core 31 can rotate axially around the second shell structure 12 to adjust the communication area between the axis of the flow passage 3122 and the axis of the first channel 1121, thereby changing the effective flow area and flow resistance of the working medium. To further explain this embodiment, the angle between the axis of the flow passage 3122 and the axis of the first channel 1121 is used as an example. When the angle changes, the effective flow area and flow resistance of the working medium change accordingly. For example, when the angle is 0°, the area connected by the two is the largest, i.e., the flow area is the largest, the flow resistance is the smallest, and the engine thrust is large. As the angle gradually increases, the area connected by the two gradually decreases, i.e., the flow area decreases, the flow resistance increases, and the engine thrust decreases accordingly, thereby achieving precise adjustment of the engine thrust.

[0087] The low-temperature precooling medium enters the first channel 1121 through the inlet 1111. At this time, the valve seat assembly 2 is in the first position, blocking the drain port 1113. The precooling medium flows in the first channel 1121 to precool the relevant engine components. After precooling is completed, the valve seat assembly 2 moves to the second position, abutting against the regulating valve core 31. The flow hole 3122 of the regulating valve core 31 is staggered from the sealing position of the valve seat assembly 2, blocking the first channel 1121. At this time, the drain port 1113 is opened, and the precooling medium is discharged from the drain port 1113.

[0088] The working medium enters the first channel 1121 through the inlet 1111. The valve seat assembly 2 is in the first position. After flowing through the flow hole 3122 of the regulating valve core 31, the working medium returns to the first channel 1121 and is discharged from the outlet 1112, driving the engine to run. According to the engine's operating requirements, the communication area between the flow hole 3122 and the first channel 1121 is adjusted to change the flow area and flow resistance of the working medium, thereby adjusting the engine thrust.

[0089] When the engine needs to be purged or shut down, the purging gas enters the second channel 1211 from the purging port 1221. The valve seat assembly 2 moves to the second position, blocking the first channel 1121 and opening the drain port 1113. The purging gas purges the relevant parts of the engine through the second channel 1211 and the first channel 1121 to ensure engine safety.

[0090] The valve seat assembly 2 can move axially within the housing structure assembly 1 to enable the opening and closing of different channels. The flow regulating assembly 3, by rotating the regulating valve core 31, changes the flow area and flow resistance of the working medium, thereby regulating the engine thrust.

[0091] In some exemplary embodiments, such as Figure 1 , Figure 2 , Figure 4As shown, the valve seat assembly 2 includes a valve seat 21, a first sealing part 22, a second sealing part 23, and an elastic element 24. The first sealing part and the second sealing part are located on both sides along the axial direction of the first shell structure to achieve sealing functions at different positions.

[0092] When the valve seat 21 is in the first position, the valve seat 21 is sealed to the first housing structure 11 through the first sealing part 22. When the valve seat 21 is in the second position, the valve seat 21 is sealed to the first housing structure 11 through the second sealing part 23.

[0093] The first sealing part 22 includes, for example, a first elastic retaining ring 221 and a first spring-energy-storing sealing ring 222, with the first elastic retaining ring 221 connected to the first spring-energy-storing sealing ring 222. The first elastic retaining ring 221 is disposed on the side near the liquid inlet 1111, and includes a first ring body 2211 and a second ring body 2212. The first ring body 2211 includes a first main body 22111 and a first clamping arm 22112 fixedly connected to the first main body 22111. The first clamping arm 22112 extends radially along the first shell structure 11 and abuts against the inner wall of the first channel 1121. The second ring body 2212 is disposed inside the first clamping arm 22112. In its natural state, the opening of the first clamping arm 22112 is relatively large. When installed inside the first channel 1121, its inner wall will interfere with the first clamping arm 22112, causing it to contract, thereby ensuring the sealing effect at that location and also ensuring the stability of the second ring body 2212. The first spring energy storage sealing ring 222 is located on the side near the liquid outlet 1112 to further enhance the sealing performance.

[0094] The elastic element 24 is connected to the valve seat 21, and its preload is set to drive the valve seat 21 to move toward the regulating valve core. Exemplarily, the elastic element 24 includes an elastic drive portion 241, which may be a compression spring or a tension spring.

[0095] The inner wall of the first shell structure 11 has a first groove 1114 communicating with the first channel. The first groove 1114 is, for example, provided on the first flange 111, and at least a portion of the structure of the first sealing part 22 and at least a portion of the structure of the second sealing part 23 are disposed within the first groove 1114. The first groove 1114 is, for example, a stepped groove with different stepped surfaces to facilitate connection with different structures. For example, it includes a first stepped surface 11141 and a second stepped surface 11142, the dimension between the first stepped surface 11141 and the axis of the first shell structure 11 being smaller than the dimension between the second stepped surface 11142 and the axis of the first shell structure 11. A first elastic retaining ring 221 is disposed on the first stepped surface 11141, and a first spring-energy-storing sealing ring 222 is disposed on the second stepped surface 11142, thereby achieving stable installation of the first sealing part 22. Of course, it is understood that other stepped surfaces can also be provided on the first shell structure 11, depending on the actual situation.

[0096] To further improve the sealing performance of the valve seat 21 when it comes into contact with the first shell structure 11, a sealing body 212 is embedded at both ends of the valve seat 21 along the axial direction. The sealing body 212 is made of a non-metallic sealing material, such as polytetrafluoroethylene, reinforced polytetrafluoroethylene, nitrile rubber, EPDM rubber or fluororubber.

[0097] The valve seat 21 has an insertion groove 213 on each of its two end faces along the axial direction. The insertion groove 213 is arranged around the circumference of the valve seat 21 and is in the shape of annular grooves. The sealing body 212 is embedded in the insertion groove 213 and is connected by an interference fit.

[0098] The outer diameter of the sealing body 212 in its free state can be slightly larger than the inner diameter (or groove depth) of the embedding groove 213. During assembly, pressure is applied to press the sealing body 212 into the embedding groove 213, causing the sealing body 212 to elastically deform and tightly fill the space between the groove wall and bottom of the embedding groove 213. The clamping force generated by this interference fit can prevent the sealing body 212 from falling off or shifting when subjected to high-pressure fluid impact or frequent valve opening and closing.

[0099] When the end face of the valve seat 21 is in close contact with the regulating valve core 31 or the first flange 111, the sealing body 212 protrudes from the embedded groove 213 and is compressed. Utilizing the resilience of the non-metallic material, it fills the microscopic unevenness, blocking the path of fluid leakage and achieving a soft seal effect, significantly improving the sealing performance during contact. Furthermore, when the valve seat 21 and the regulating valve core 31 collide hard, the sealing body 212 acts as an elastic buffer layer, absorbing some of the impact kinetic energy and mitigating the rigid impact between metals. This not only reduces noise when the valve is closed but also reduces mechanical wear on the valve seat 21 and the regulating valve core 31, extending the valve's service life.

[0100] In this embodiment, as Figure 1 , Figure 2 , Figure 4 As shown, the valve seat 21 is movably disposed within the first housing structure 11. A first boss 211 is formed on the circumferential outer wall of the valve seat 21, which extends outward into a first groove 1114 opened in the inner wall of the first housing structure 11. The first groove 1114 has a stepped groove structure, providing travel space and mounting base for the movement of the valve seat assembly 2.

[0101] When the elastic drive part 241 is a compression spring, it is sandwiched between the first boss 211 and the first sealing part 22. The elastic drive part 241 is configured to push the valve seat 21 towards the regulating valve core 31 via the first boss 211, thereby ensuring that the end face of the valve seat 21 tightly abuts against the regulating valve core 31, achieving a sealing function. To prevent radial displacement or bending of the compression spring during operation, this embodiment provides a first receiving groove 2221 on the first spring energy storage sealing ring 222 of the first sealing part 22. Part of the structure of the elastic drive part 241 is housed within this first receiving groove 2221, using the groove wall to radially limit the spring, ensuring uniform force distribution and improving operational stability.

[0102] The second sealing part 23 includes a first sub-sealing part 231 and a second sub-sealing part 232 that are spaced apart along the axial direction of the first shell structure 11. The two work together to ensure the sealing of the valve seat 21 during movement.

[0103] The first sub-sealing part 231 is disposed between the first groove 1114 and the valve seat 21. Its structure, along the axial direction, includes a second elastic retaining ring 2311, a second spring-loaded sealing ring 2312, and a first washer 2313. The second elastic retaining ring 2311 is fixedly connected to the first boss 211, allowing the first sub-sealing part 231 to move synchronously with the valve seat 21. The shape of the second spring-loaded sealing ring 2312 is adapted to the outer circumferential surface shape of the first boss 211, providing a tight fit to prevent leakage of the medium from the first boss 211. When the valve seat 21 moves towards the regulating valve core 31, the first washer 2313 abuts against the sidewall of the first groove 1114, providing a sealing effect.

[0104] The second sub-sealing part 232 is disposed between the inner wall of the first channel 1121 and the valve seat 21, and is fixedly connected to the inner wall of the first channel 1121, maintaining a stationary state. Its structure includes, along the axial direction, a second washer 2321, a third spring-loaded sealing ring 2322, and a third elastic retaining ring 2323. The shape of the third spring-loaded sealing ring 2322 is adapted to the inner wall of the first channel 1121 to ensure sealing on the stationary side. The third elastic retaining ring 2323 fills the gap between the outer wall of the valve seat 21 and the inner wall of the first channel 1121, assisting in sealing and preventing impurities from entering. The valve seat 21 has a raised structure. When the valve seat 21 moves towards the regulating valve core 31, this raised structure abuts against the second washer 2321, further ensuring sealing performance.

[0105] It should be noted that the configuration of the elastic drive portion 241 of the valve seat assembly 2 described above is flexible in several ways. In another embodiment, when the elastic drive portion 241 is a tension spring, its installation position is adjusted to be sandwiched between the first boss 211 and the second sealing portion 23. In this case, the elastic drive portion 241 is configured to pull the valve seat 21 away from the regulating valve core 31 via the first boss 211, so that the valve seat 21 abuts against the regulating valve core 31.

[0106] In this tension spring condition, the specific structural forms of the first sealing part 22 and the second sealing part 23 are basically the same as or similar to those in the compression spring condition described above. The difference is that, in order to adapt to the transmission of tensile force, the structural forms of the first sealing part 22 and the second sealing part 23 may be interchanged or adjusted according to the connection point of the spring.

[0107] It should also be noted that the aforementioned elastic drive part 241 can be one or more. When only one elastic drive part 241 is provided, the elastic drive part 241 is sleeved on the circumferential outer wall of the valve seat 21 and remains coaxial with the valve seat 21, ensuring that the force exerted by the elastic drive part 241 on the valve seat 21 is evenly distributed, which is beneficial to the smooth movement of the valve seat 21.

[0108] The elastic drive unit 241 can also be disposed on the outer periphery of the valve seat 21, parallel to the valve seat 21 but not on the same axis. This is suitable for situations where space is limited or a specific driving direction is required. By adjusting the installation angle and position of the elastic drive unit 241, it can still be ensured that it moves effectively along the axial direction of the first shell structure 11, driving the valve seat 21 to perform the expected action.

[0109] When multiple elastic drive units 241 are provided and arranged sequentially at intervals along the circumference of the valve seat 21, the stability of the valve seat 21 during movement can be significantly improved, avoiding jamming or tilting caused by uneven force on one side. At the same time, the combined action of multiple elastic drive units 241 can also enhance the driving force, ensuring that the valve seat assembly 2 can reliably perform the expected actions under various working conditions.

[0110] In this embodiment, as Figure 1 , Figure 2 , Figure 4 As shown, the valve seat assembly 2 also includes a limiting rod 25, which is fixedly connected to the first boss 211. The elastic drive part 241 is limited by the limiting rod 25, which is configured to restrict the deformation path of the elastic drive part 241. The axial length of the limiting rod 25 is less than the axial length of the elastic drive part 241 in its free state, so that when the elastic drive part 241 is compressed and deformed to a preset degree, the movement of the valve seat 21 is limited by the limiting rod 25, preventing excessive deformation of the elastic drive part 241 and affecting the accuracy of movement.

[0111] It should be noted that the number of limit rods 25 can be flexibly adjusted according to the number of elastic drive units 241 in actual needs. One limit rod 25 can correspond to one elastic drive unit 241, or multiple limit rods 25 can work together to adapt to the limit requirements under different working conditions.

[0112] To further improve the stability of the limit rod 25 during installation, a first insertion groove 2111 is provided on the first boss 211, and a first insertion block 251 is provided on the limit rod 25. The first insertion block 251 is inserted into the first insertion groove 2111 to increase the contact area and improve the reliability of the connection.

[0113] Furthermore, to prevent the limiting rod 25 from moving or shifting in the axial direction, a first protrusion 2511 is radially provided on the first insertion block 251, and a second protrusion 21111 is correspondingly provided at the opening of the first insertion groove 2111. When the first insertion block 251 is fully inserted into the first insertion groove 2111, the first protrusion 2511 and the second protrusion 21111 abut against each other along the axial direction of the first shell structure 11, achieving a reliable locking effect.

[0114] In this embodiment, as Figure 1 , Figure 2 , Figure 4 As shown, the first shell structure 11 has an air control port 1124. For example, the air control port 1124 is opened on the first shell 112 of the first shell structure 11, and the air control port 1124 is connected to the first channel 1121.

[0115] A pressure chamber is formed between the inner circumference of the first channel 1121 and the outer circumference of the valve seat assembly 2, and this pressure chamber is connected to the pneumatic control port 1124. When it is necessary to control the movement of the valve seat assembly 2, a preset pressure of control air is simply introduced into the pneumatic control port 1124. This control air pressure will quickly enter the pressure chamber and generate a driving force on the valve seat assembly 2 in the direction of approaching the liquid inlet 1111. Under the action of this driving force, the valve seat assembly 2 will overcome the elastic force of the elastic drive part 241 and move, thereby realizing the functions of opening or closing the channel and meeting different working requirements.

[0116] In some exemplary embodiments, such as Figure 2 , Figures 4-8 As shown, the regulating valve core 31 includes a first connecting section 311, an regulating body 312, and a second connecting section 313. The first connecting section 311 and the second connecting section 313 are respectively disposed on both sides of the regulating body 312, forming a symmetrical or asymmetrical layout. The regulating body 312 is disposed within the first channel 1121 of the first shell structure 11, while the first connecting section 311 and the second connecting section 313 extend into the second channel 1211 of the second shell structure 12.

[0117] The regulating body 312 has a spherical structure, with a flow passage 3122 at its geometric center. This flow passage 3122 serves as the flow path for the working medium, and its diameter and shape can be designed according to actual flow requirements. The regulating body 312 can rotate around the axis of the second shell structure 12.

[0118] During the adjustment process, by changing the rotation angle of the adjusting body 312, the communication area between the flow orifice 3122 and the first channel 1121 can be adjusted, thereby changing the overlap area (i.e., the effective flow area) between the axial direction of the flow orifice 3122 and the axial direction of the first channel 1121. When the overlap area is at its maximum, the flow resistance is minimum and the flow rate is maximum; when the overlap area decreases, the flow resistance increases and the flow rate decreases, thus achieving precise adjustment of the working medium flow rate.

[0119] Furthermore, the outer peripheral surface of the regulating body 312 is a spherical structure. When the valve seat assembly 2 moves to the second position, the sealing surface of the valve seat assembly 2 abuts against the spherical area of ​​the regulating body 312, effectively blocking the first channel 1121 and preventing the working medium from passing through by utilizing the characteristics of spherical sealing.

[0120] To ensure that the working medium can smoothly enter and exit the flow hole 3122, the second connecting section 313 is provided with an auxiliary flow channel 3131. The auxiliary flow channel 3131 is coaxially arranged and connected with the second channel 1211, and the auxiliary flow channel 3131 is further connected to the flow hole 3122 and the second channel 1211 to form a complete fluid channel.

[0121] Correspondingly, an auxiliary flow channel 3131 is also provided on the first connecting section 311, which is connected to the flow passage 3122. By providing auxiliary flow channels 3131 on both the first connecting section 311 and the second connecting section 313, the working medium can flow from the second channels 1211 on both sides through the auxiliary flow channel 3131 to the flow passage 3122 in the center of the regulating body 312, or flow from the flow passage 3122 to both sides, thereby ensuring the continuity and stability of the fluid during the rotation of the regulating valve core 31, and avoiding flow channel blockage or excessive pressure loss caused by rotation.

[0122] In order to improve the stability of the adjusting body 312, a bushing 3121 is provided on the outside of the adjusting body 312. That is, the adjusting body 312 and the second housing 121 and the second flange 122 and the adjusting body 312 are connected by a bushing 3121, and the bushing 3121 and the second housing 121 and the second flange 122 are fixed in position by a positioning pin 31211.

[0123] In this embodiment, the core component of the regulating valve core 31 is the regulating body 312. For example... Figure 2 , Figures 4-8 As shown, the outer circumferential surface of the regulating body 312 is designed as a spherical structure. This spherical structure mates with the sealing surface of the valve seat assembly 2. When the flow regulating assembly 3 needs to close the channel, the valve seat assembly 2 moves to the second position under the action of the drive mechanism. At this time, the sealing surface of the valve seat assembly 2 tightly abuts against the spherical area of ​​the regulating body 312. Utilizing the self-centering characteristic of the spherical seal, even if there are minor machining errors or assembly deviations between the valve seat assembly 2 and the regulating body 312, the angle can be automatically adjusted through the spherical contact to ensure tight contact of the sealing surfaces. This design effectively blocks the first channel 1121, preventing the working medium from passing through, while reducing the stringent requirements on the flatness of the sealing surface, thus improving the reliability and service life of the seal.

[0124] To ensure efficient flow of the working medium during the rotation of the regulating valve core 31, this embodiment optimizes the internal flow channel of the regulating valve core 31. Specifically, an auxiliary flow channel 3131 is provided on the second connecting section 313. This auxiliary flow channel 3131 is coaxially aligned with and connected to the second channel 1211 of the second shell structure 12, and further connected to the flow hole 3122 at the center of the regulating body 312. Correspondingly, an auxiliary flow channel 3131 is also provided on the first connecting section 311, and this auxiliary flow channel 3131 is also connected to the flow hole 3122. By providing auxiliary flow channels 3131 in both the first connecting section 311 and the second connecting section 313, a fluid path is formed that enters from both sides and exits from the middle, or enters from the middle and exits from both sides. The working medium can flow from the second channels 1211 on both sides through the auxiliary flow channels 3131 to the flow hole 3122 at the center of the regulating body 312, or be diverted from the flow hole 3122 to both sides. This symmetrical flow channel layout ensures the continuity and stability of the fluid in the regulating valve core 31 at any rotation angle, avoiding problems such as flow channel blockage, eddies, or excessive pressure loss caused by rotation, and ensuring the linearity and response speed of flow regulation.

[0125] Considering the potential vibration or displacement of the adjusting body 312 under high-speed rotation and high pressure differential conditions, this embodiment also provides a bushing 3121 on the outer side of the adjusting body 312. Specifically, the adjusting body 312 is connected to the second housing 121 of the second housing structure 12, and the second flange 122 is connected to the adjusting body 312 via a bushing 3121. The bushing 3121 provides radial support and reduces friction, absorbing the radial force during the rotation of the adjusting body 312 and preventing it from becoming eccentric or wobbling, thereby improving the rotational stability of the adjusting body 312. To ensure that the bushing 3121 is fixed in the circumferential direction and prevent it from spinning freely or undergoing circumferential displacement with the adjusting body 312, this embodiment uses locating pins 31211 to fix the bushing 3121 to the second housing 121 and to the second flange 122. The positioning pin 31211 restricts the circumferential degree of freedom of the bushing 3121, keeping it stationary or moving along a predetermined trajectory, thereby providing a stable rotational reference for the adjustment body 312 and ensuring the relative positional accuracy between the flow hole 3122 and the first channel 1121.

[0126] In this embodiment, as Figure 2 , Figures 4-8 As shown, the flow regulating assembly 3 includes a regulating drive unit 32. The regulating drive unit 32 is disposed on the second housing structure 12, and its driving end is connected to the first connecting section 311 of the regulating valve core 31. The regulating drive unit 32 is configured to drive the regulating valve core 31 to rotate axially about the second housing structure 12, thereby realizing the adjustment of the opening degree of the flow orifice 3122.

[0127] For example, the adjustment drive unit 32 includes a first drive body 321 and a drive shaft 322. The first drive body 321 is, for example, a drive motor (such as a servo motor), whose housing is fixedly connected to the second housing structure 12. The drive end of the first drive body 321 is rotatably inserted into the second channel 1211 and fixedly connected to one end of the drive shaft 322. The other end of the drive shaft 322 is fixedly connected to the first connecting section 311 of the adjustment valve core 31, thereby transmitting power to the adjustment valve core 31.

[0128] To enhance the rigidity and coaxiality of the connection, a third bushing 323 is fixedly sleeved on the radial outer wall of the drive end of the first drive body 321. This third bushing 323 is simultaneously fixedly sleeved on both the drive end of the first drive body 321 and the drive shaft 322, achieving a synchronous fixed connection among the three. Furthermore, a first tapered roller bearing 324 is provided between the radial outer wall of the third bushing 323 and the inner wall of the second channel 1211. This first tapered roller bearing 324 is used to bear radial and axial loads, reducing frictional resistance during drive end rotation and ensuring the smoothness and accuracy of the regulating valve core 31's rotation.

[0129] In this embodiment, as Figure 2 , Figures 4-8 As shown, the combined valve in this disclosure may be used in cryogenic environments (such as cryogenic media like liquid hydrogen and liquid oxygen). Therefore, an isolation layer 325 is sandwiched between the first actuator 321 and the second shell structure 12. This isolation layer 325 is made of a non-metallic sealing material, such as polyetheretherketone, polytetrafluoroethylene, or glass fiber reinforced composite material. By providing this isolation layer 325, the rate at which the temperature of the cryogenic working medium is transferred to the first actuator 321 via the second shell structure 12 can be effectively blocked or reduced, preventing the drive motor from experiencing performance degradation or damage due to low temperature, thereby protecting the operational reliability of the first actuator 321.

[0130] The driving end of the first drive body 321 is provided with a spline structure. A splined shaft of the same specification (i.e., a part of the drive shaft 322) extends into the third bushing 323 in conjunction with this structure. The motor torque generated by the first drive body 321 is transmitted to the drive shaft 322 through this spline structure, and then to the regulating valve core 31 via the subsequent bushing. This spline connection not only transmits a large torque but also ensures the coaxiality between the drive shaft 322 and the first drive body 321, and allows for a certain degree of axial sliding, thereby precisely controlling the rotation angle of the regulating valve core 31 and achieving precise adjustment of the working conditions (such as flow rate and pressure) required by the working medium.

[0131] In this embodiment, as Figure 2 , Figures 4-8As shown, to prevent the working medium from leaking from the second channel 1211 to the external environment, or to prevent external impurities from entering the channel, a sealing structure 33 is provided between the drive shaft 322 and the inner wall of the second channel 1211 of the second housing structure 12. This sealing structure 33 is designed to maintain sealing performance as the drive shaft 322 rotates, ensuring sealing reliability during the rotation of the regulating valve core 31.

[0132] For example, the sealing structure 33 includes a third sealing portion 331. The third sealing portion 331 adopts a multi-layer composite sealing design, such as including a third washer 3311, a fourth spring-energy-storing sealing ring 3312 and a fourth elastic retaining ring 3313 connected sequentially along the axial direction of the second shell structure 12.

[0133] The third washer 3311 is sandwiched between the third bushing 323 and the inner wall of the second channel 1211, serving as a preliminary seal and support. The fourth spring-energy-storing seal ring 3312 is attached to the inner wall of the second channel 1211, its shape matching the shape of the inner wall of the second channel 1211. Utilizing the elastic restoring force of the spring-energy-storing seal ring, it tightly adheres to the channel wall to accommodate the slight vibrations during the rotation of the drive shaft 322 and maintain a dynamic seal. The fourth elastic retaining ring 3313 is sandwiched between the drive shaft 322 and the second channel 1211, used to limit the axial movement of the drive shaft 322 and assist in sealing. It should be noted that the structural design of the fourth elastic retaining ring 3313 is the same as or similar to the structural design of the first elastic retaining ring 221 in the aforementioned valve seat assembly 2 (e.g., using a retaining ring structure with elastic clamping arms), and will not be repeated here.

[0134] To further enhance the sealing effect and isolate different functional areas, two third sealing parts 331 can be provided, arranged symmetrically. One third sealing part 331 is located at the connection position between the drive shaft 322 and the first drive body 321 (i.e., the end near the third bushing 323), used to isolate the drive source side from the fluid passage. The other third sealing part 331 is located at the connection position between the drive shaft 322 and the regulating valve core 31 (i.e., the end near the first connecting section 311), used to ensure the sealing of the fluid passage.

[0135] The symmetrical double-layer sealing structure effectively blocks the leakage path of the working medium along the gap between the drive shaft 322 and the second channel 1211, ensuring the sealing performance and operational reliability of the combined valve even under ultra-low temperature or high pressure differential conditions.

[0136] In this embodiment, as Figure 2 , Figures 4-8 As shown, the flow regulating component 3 includes a first bushing 34 and a second bushing 36, which work together to provide auxiliary support and rotation guidance for the regulating valve core 31.

[0137] For example, the first bushing 34 is rotatably disposed within the second channel 1211 of the second housing structure 12. To achieve low-friction rotational support, a second tapered roller bearing 341 is provided on the outer wall of the first bushing 34. The outer ring of the second tapered roller bearing 341 is fixedly connected to the inner wall of the second channel 1211, and the inner ring mates with the outer wall of the first bushing 34. The use of tapered roller bearings can effectively withstand radial loads and axial loads in a single direction, ensuring the smoothness and accuracy of the rotation of the first bushing 34 within the second channel 1211.

[0138] Similarly, the second bushing 36 is fitted onto the second connecting section 313 of the regulating valve core 31. A third tapered roller bearing 361 is provided on the outer wall of the second bushing 36, and the third tapered roller bearing 361 is fixedly connected to the inner wall of the second channel 1211. Through the above arrangement, both ends of the regulating valve core 31 (the first connecting section 311 and the second connecting section 313) are rotatably connected to the second shell structure 12 via the first bushing 34 and the second bushing 36, respectively, forming a stable double-support structure. This effectively reduces the radial runout of the regulating body 312 during rotation and improves the accuracy of flow regulation.

[0139] In order to achieve effective power transmission and axial positioning, one end of the first bushing 34 is sleeved on the first connecting section 311 of the regulating valve core 31, and the other end is sleeved on the drive shaft 322, so that the rotational motion of the drive shaft 322 can be transmitted to the first connecting section 311 through the first bushing 34, thereby driving the entire regulating valve core 31 to rotate.

[0140] To prevent relative axial movement or disengagement between the first bushing 34 and the drive shaft 322, the flow regulating assembly 3 in this embodiment also includes a locking pin 35. The locking pin 35 passes through the first bushing 34 and the drive shaft 322 (specifically, it can be disposed within the radial holes of both), thereby achieving axial locking. This locking pin 35 ensures that the drive shaft 322 and the first bushing 34 move synchronously in the axial direction, guaranteeing the continuity and reliability of torque transmission.

[0141] In this embodiment, as Figure 2 , Figures 4-8 As shown, the flow regulating assembly 3 also includes an adjusting pad 37, which is used to fine-tune the installation position of the regulating valve core 31 to ensure that the horizontal plane where the axis of the flow hole 3122 of the regulating valve core 31 is located coincides with the axis of the valve seat assembly 2, thereby ensuring the flow performance and sealing performance of the valve in the fully open state.

[0142] For example, both the first connecting section 311 and the second connecting section 313 are fitted with an adjusting pad 37. The adjusting pad 37 can be made of a non-metallic material with certain elasticity and wear resistance, such as polytetrafluoroethylene, graphite-filled composite material, etc., so as to undergo slight elastic deformation when subjected to axial pressure and fill the mating gap.

[0143] In this embodiment, as Figure 2 , Figures 4-8 As shown, a flange 314 is provided at the connection between the adjusting body 312 and the first connecting section 311, as well as at the connection between the adjusting body 312 and the second connecting section 313. The flange 314 serves to provide axial positioning and limiting.

[0144] For example, the adjusting pad 37 located in the first connecting section 311 is sandwiched between the first bushing 34 and the corresponding flange 314. The adjusting pad 37 located in the second connecting section 313 is sandwiched between the second bushing 36 and the corresponding flange 314.

[0145] During assembly, the axial clearance between the first bushing 34 and the flange 314, and between the second bushing 36 and the flange 314, can be changed by adjusting the thickness or number of adjusting pads 37. Since the first bushing 34 is fixed to the inner wall of the second channel 1211 by the second tapered roller bearing 341, and the second bushing 36 is fixed to the inner wall of the second channel 1211 by the third tapered roller bearing 361, when the axial locking structure is tightened or adjusted, the bushings will press the adjusting pads 37, thereby pushing the regulating valve core 31 to produce a slight axial displacement or radial deflection until the axis of the flow hole 3122 at the center of the regulating body 312 is completely aligned with the axis of the valve seat assembly 2.

[0146] The coaxiality is precisely adjusted by using the adjusting pad 37. The clamping fit between the flange 314 and the bushing ensures that the adjusted position can be reliably locked, preventing the regulating valve core 31 from axially moving under the impact of the working medium, thereby ensuring the long-term stability and sealing reliability of the combination valve.

[0147] In some exemplary embodiments, such as Figures 1-8 As shown, a rocket engine is used in the propulsion system of a launch vehicle to generate thrust. The rocket engine includes the engine body and a medium system.

[0148] The media system is primarily used for storing and transporting working media (such as liquid oxygen, liquid hydrogen, kerosene, and other propellants). Specifically, the media system includes a media supply unit, which can be a high-pressure gas cylinder, a turbopump, or a pressure vessel, depending on the actual situation.

[0149] The rocket engine also includes a combination valve in any of the above embodiments. The combination valve includes a first shell structure 11, a second shell structure 12, a valve seat assembly 2, and a flow regulating assembly 3. The specific connection method will not be repeated here.

[0150] The inlet 1111 of the combination valve is connected to the media supply unit of the media system through a pipeline. The working medium flows out from the media supply unit and enters the first channel 1121 of the first shell structure 11 through the inlet 1111.

[0151] During rocket engine operation, a preset pressure of control air is introduced into the air control port 1124. This control air quickly enters the pressure chamber and generates a driving force on the valve seat assembly 2 towards the liquid inlet 1111. Meanwhile, the regulating drive unit 32 of the flow regulating assembly 3 receives a control signal and drives the regulating valve core 31 to rotate axially around the second shell structure 12. By changing the overlapping area of ​​the flow passage 3122 on the regulating body 312 and the first channel, precise regulation of the propellant flow rate is achieved, thereby controlling the engine thrust.

[0152] When it is necessary to cut off the medium, the control air pressure is removed. Under the pre-tightening force of the elastic element 24, the valve seat assembly 2 is driven to move towards the liquid outlet 1112 and fits tightly with the regulating valve core 31, so as to realize the opening and closing of different openings of the valve.

[0153] In some exemplary embodiments, a launch vehicle includes a rocket body structure, a control system, and a propulsion system. The propulsion system employs a rocket engine as described in the above embodiments. This rocket engine is installed in the booster or core stage of the launch vehicle to provide the thrust required for flight.

[0154] During launch, the medium system supplies propellant to the combination valve, which adjusts the flow rate according to the instructions of the control system, so that the rocket engine works according to a predetermined program, thereby realizing the attitude control, orbit transfer or orbit insertion of the launch vehicle.

[0155] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0156] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A combination valve, characterized in that, include: A shell structure assembly includes a first shell structure and a second shell structure. The first shell structure has a liquid inlet, a liquid outlet, and a first channel connecting the liquid inlet and the liquid outlet. The second shell structure passes through the first shell structure, and the axial direction of the first shell structure is at a preset angle to the axial direction of the second shell structure; the second shell structure has a second channel along its axial direction, and the second channel is connected to the first channel; the first shell structure has a drain port along its radial direction, and the drain port is located close to the inlet port; A valve seat assembly is disposed within the first channel, and the valve seat assembly is movable between a first position and a second position in the first channel along the axial direction of the first housing structure; as well as A flow regulation assembly includes a regulating valve core disposed in a second channel and a first channel; wherein the regulating valve core has an overflow orifice; wherein the regulating valve core is rotatable about the axial direction of the second shell structure to adjust the communication area between the overflow orifice and the first channel, thereby changing the effective flow area and flow resistance of the working medium; When the valve seat assembly is in the first position, the valve seat assembly is configured to block the drain port, and the valve seat assembly is spaced apart from the regulating valve core; when the valve seat assembly is in the second position, the flow hole is staggered from the sealing position of the valve seat assembly, the valve seat assembly abuts against the regulating valve core to block the first channel, and the valve seat assembly is staggered from the drain port to open the drain port.

2. The combined valve according to claim 1, characterized in that, The valve seat assembly includes a valve seat, a first sealing part, a second sealing part, and an elastic element, wherein the first sealing part and the second sealing part are located on two sides along the axial direction of the first shell structure; When the valve seat is in the first position, the valve seat is sealed to the first shell structure through the first sealing part; when the valve seat is in the second position, the valve seat is sealed to the first shell structure through the second sealing part. The elastic element is connected to the valve seat, and the preload of the elastic element is set to drive the valve seat to move closer to the regulating valve core.

3. The combined valve according to claim 2, characterized in that, The elastic element includes at least one elastic drive unit; The inner wall of the first shell structure is provided with a first groove communicating with the first channel; at least a portion of the structure of the first sealing part and at least a portion of the structure of the second sealing part are disposed in the first groove; The circumferential outer wall of the valve seat is formed with a first protrusion extending into the first groove; The elastic drive portion is sandwiched between the first boss and the first sealing portion, and the elastic drive portion is configured to push against the valve seat through the first boss, causing the valve seat to abut against the regulating valve core; or... The elastic drive unit is sandwiched between the first boss and the second sealing part, and the elastic drive unit is configured to pull the valve seat through the first boss so that the valve seat abuts against the regulating valve core.

4. The combined valve according to claim 3, characterized in that, The valve seat assembly further includes at least one limiting rod, which is fixedly connected to the first boss; The elastic drive unit is limited by the limiting rod, and the limiting rod is configured to restrict the deformation path of the elastic drive unit; wherein, the axial length of the limiting rod is less than the axial length of the elastic drive unit in its free state.

5. The combined valve according to claim 3, characterized in that, The first shell structure has an air control port, which is connected to the first channel; A pressure chamber is formed between the inner circumference of the first channel and the outer circumference of the valve seat assembly. The pressure chamber is connected to the pneumatic control port. The control air pressure entering the pressure chamber drives the valve seat assembly to move towards the liquid inlet, overcoming the elastic force of the elastic drive part.

6. The combined valve according to claim 2, characterized in that, The valve seat is fitted with sealing bodies at both ends along the axial direction of the first shell structure, and the sealing bodies are made of non-metallic sealing materials.

7. The combined valve according to claim 6, characterized in that, The first shell structure includes a first flange and a first shell, wherein the first flange is sealed to the first shell; The inlet is located on the first flange, and the first channel is located between the first flange and the first housing. The first housing has a drain port, and the outlet is located on the first housing. The outlet forms a working medium channel and is used to discharge the working medium leaking through the adjacent sealing body. The outlet, the first channel, and the outlet are coaxially arranged. The drain port is located on the first flange and is used to discharge the precooling medium.

8. The combined valve according to claim 7, characterized in that, The second shell structure includes a second flange and a second shell, the second shell and the second flange are respectively disposed on both sides of the first shell, and the second flange and the second shell are respectively sealed to the first shell; The second flange has a blow-out port, which communicates with the second channel; wherein, the second channel is formed on the second flange and the second housing; The purge port is used to purge the propellant inside the combined valve and downstream after the engine is stopped; The first housing has a first opening and a second opening opposite to each other. The first opening connects the first channel and the second channel on the second housing, and the second opening connects the second channel on the second flange and the first channel.

9. The combined valve according to any one of claims 1-8, characterized in that, The regulating valve core includes a first connecting section, an regulating body, and a second connecting section. The first connecting section and the second connecting section are respectively disposed on both sides of the regulating body. The regulating body is disposed in the first channel, and the first connecting section and the second connecting section are respectively disposed in the second channel. The regulating body has a spherical structure, and the flow passage is opened at the center of the regulating body; the regulating body can rotate around the axis of the second shell structure, and the regulating body changes the overlapping area of ​​the flow passage and the first channel by changing the rotation angle; wherein, when the valve seat assembly abuts against the spherical area of ​​the regulating body, the first channel is blocked; Both the second connecting section and the first connecting section are provided with auxiliary flow channels. The auxiliary flow channels are coaxial with and connected to the second channel, and the auxiliary flow channels connect the flow holes and the second channel.

10. The combined valve according to claim 9, characterized in that, The flow regulation component includes a regulation drive unit, which is disposed in the second housing structure, and the drive end of the regulation drive unit is connected to the first connecting section; The regulating drive unit is configured to drive the regulating valve core to rotate about the axial direction of the second housing structure.

11. The combined valve according to claim 10, characterized in that, The adjustment drive unit includes a first drive body and a drive shaft. The first drive body is connected to the second shell structure. The drive end of the first drive body is rotatably inserted into the second channel and fixedly connected to one end of the drive shaft. The other end of the drive shaft is fixedly connected to the first connecting section.

12. The combined valve according to claim 11, characterized in that, A sealing structure is provided between the drive shaft and the inner wall of the second channel.

13. The combined valve according to claim 11, characterized in that, An isolation pad layer is sandwiched between the first driving body and the second shell structure, and the isolation pad layer is made of a non-metallic sealing material.

14. The combined valve according to claim 11, characterized in that, The flow regulating component includes a first bushing, a locking pin, and a second bushing. The first bushing is rotatably disposed in the second channel, one end of the first bushing is sleeved on the first connecting section, and the other end of the first bushing is sleeved on the drive shaft; The locking pin passes through the first bushing and the drive shaft to achieve axial locking; The second bushing is fitted onto the second connecting section.

15. The combined valve according to claim 14, characterized in that, The flow regulating component includes an regulating pad, and the first connecting section and the second connecting section are both fitted with the regulating pad; The adjusting pad is configured for installation position adjustment such that the horizontal plane containing the flow hole axis of the regulating valve core coincides with the axis of the valve seat assembly.

16. The combined valve according to claim 15, characterized in that, A flange is provided at the connection between the adjusting body and the first connecting segment, and at the connection between the adjusting body and the second connecting segment; the adjusting pad located in the first connecting segment is sandwiched between the first bushing and the corresponding flange; the adjusting pad located in the second connecting segment is sandwiched between the second bushing and the corresponding flange.

17. A rocket engine, characterized in that, The system includes a combination valve as described in any one of claims 1-16 and a media system, wherein the media system includes a media supply unit connected to the inlet of the combination valve.

18. A launch vehicle, characterized in that, Including the rocket engine as described in claim 17.

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