A thrust regulating device for a recoverable liquid rocket engine

Abstract

This application relates to the field of liquid rocket engine technology, and more particularly to a thrust adjustment device for a reusable liquid rocket engine. The thrust adjustment device includes an oxygen auxiliary valve thrust adjustment valve and a drive device. The oxygen auxiliary valve thrust adjustment valve includes a valve body assembly and a switching assembly. The valve body assembly internally comprises a first chamber, a second chamber, and a valve port. The first chamber includes a first small-sized portion and a first large-sized portion that are connected to each other. The first small-sized portion is connected to the valve port, and the first large-sized portion is connected to the second chamber. The switching assembly is disposed inside the valve body assembly and includes a connected body and a needle. The body is located in the second chamber, and the needle is located in the first chamber. The drive device is capable of driving the switching assembly to move within the valve body assembly. According to the thrust adjustment device of this application, the drive device can drive the switching assembly to move to adjust the open space of the first chamber.

Description

Technical Field

[0001] This application relates to the field of liquid rocket engine technology, and in particular to a thrust adjustment device for a reusable liquid rocket engine. Background Technology

[0002] In reusable liquid rocket engines, thrust is regulated by adjusting the full opening of the oxygen auxiliary valve, oxygen main valve, and fuel main valve. However, in current control methods, when the thrust is high, the oxygen flow rate is too fast, increasing the risk of failure and resulting in poor system stability. Utility Model Content

[0003] The summary of this application introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] This application provides a thrust adjustment device for a reusable liquid rocket engine, the thrust adjustment device comprising an oxygen auxiliary valve thrust adjustment valve and a drive device, the oxygen auxiliary valve thrust adjustment valve comprising: A valve body assembly, wherein the valve body assembly internally comprises a first chamber, a second chamber, and a valve port, the first chamber including a first small-sized portion and a first large-sized portion that are connected to each other, the first small-sized portion being connected to the valve port, and the first large-sized portion being connected to the second chamber; and A switching assembly is disposed inside the valve body assembly. The switching assembly includes a connected body and a needle body. The body is located in the second chamber, and the needle body is located in the first chamber. The drive device is capable of driving the switch assembly to move within the valve body assembly.

[0005] According to the thrust regulating device for a reusable liquid rocket engine of this application, the thrust regulating device includes an oxygen auxiliary valve thrust regulating valve and a driving device. The oxygen auxiliary valve thrust regulating valve includes a valve body assembly and a switching assembly. The valve body assembly has a first chamber, a second chamber, and a valve port. The first chamber includes a first small-sized portion and a first large-sized portion that are connected to each other. The first small-sized portion is connected to the valve port, and the first large-sized portion is connected to the second chamber. The switching assembly is disposed inside the valve body assembly and includes a connected body and a needle. The body is located in the second chamber, and the needle is located in the first chamber. The driving device can drive the switching assembly to move within the valve body assembly. Thus, the driving device can drive the switching assembly to move towards the first large-sized portion to expand the open space of the first chamber, thereby increasing the fluid volume. Alternatively, the driving device can drive the switching assembly to move towards the valve port to reduce the open space of the first chamber, thereby reducing the fluid volume.

[0006] Optionally, the first chamber further includes a chamber wall that extends inwardly at an angle toward the valve port.

[0007] Optionally, the cavity wall includes a first end and a second end, the first end being closer to the valve port than the second end, the first end forming the first small-sized portion around the first end, and the second end forming the first large-sized portion around the first end.

[0008] Optionally, the needle body can move between a closed position and an open position along the axial direction of the body. The needle body, in the closed position, is in close contact with the cavity wall to close the valve port. The needle body, located in the open position, is spaced apart from the cavity wall to open the valve port.

[0009] Optionally, the needle body includes a second smaller portion, and the cavity wall includes a first end. The second smaller portion of the needle body, located in the closed position, fits tightly against the first end. The second small portion of the needle body located in the open position is spaced apart from the first end.

[0010] Optionally, the needle body further includes a second large-size portion connected to the second small-size portion, and the cavity wall includes a second end. The second large-sized portion of the needle body, located in the closed position, is in close contact with the second end. The second large-sized portion of the needle body located in the open position is spaced apart from the second end.

[0011] Optionally, a gap exists between the needle body and the cavity wall. The needle moves toward the valve port to reduce the gap. The needle moves away from the valve opening to widen the gap.

[0012] Optionally, the valve port includes a third small portion and a third large portion that are connected to each other, wherein the third small portion is closer to the first chamber than the large portion.

[0013] Optionally, the oxygen auxiliary valve push valve further includes a liquid oxygen inlet and a liquid oxygen outlet, wherein the liquid oxygen inlet is connected to the third large-size part, and the liquid oxygen outlet is connected to the second chamber.

[0014] Optionally, the driving device includes a motor, a rotating component, and a moving component. The moving component is threadedly connected to the rotating component and is connected to the main body. The motor can drive the rotating component to rotate, thereby causing the moving component to move along the axial direction of the main body. Attached Figure Description

[0015] The following figures are included as part of this application for understanding the application. The figures illustrate embodiments of the application and their descriptions, explaining the apparatus and principles of the application. In the figures, Figure 1 This is a cross-sectional view of a thrust adjustment device according to a preferred embodiment of this application; Figure 2 for Figure 1 A magnified view of part A in the image; Figure 3 For example Figure 1 A cross-sectional view of the oxygen auxiliary valve of the thrust regulating device shown; Figure 4 for Figure 3 A magnified view of part B shown; Figure 5 For example Figure 1 The diagram shows the connection between the rotating and moving components of the drive device.

[0016] Explanation of reference numerals in the attached figures: 1: Thrust adjustment device; 10: Oxygen auxiliary valve push valve; 110: Valve body assembly; 111: First chamber; 112: Second chamber; 113: Valve port; 114: Chamber wall; 1111: First small-sized section; 1112: First large-sized section; 1131: Third small-sized section; 1132: Third large-sized section; 1141: First end; 1142: Second end; 120: Switch assembly; 121: Main body; 122: Needle body; 123: Needle wall; 1221: Second smallest size section; 1222: Second largest size section; 130: Liquid oxygen inlet; 140: Liquid oxygen outlet; 20: Drive unit; 210: Motor; 220: Rotating component; 230: Moving component. Detailed Implementation

[0017] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.

[0018] To fully understand this application, detailed portions will be set forth in the following description in order to illustrate it. Obviously, implementation of this application is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this application are described in detail below; however, other embodiments may exist besides these detailed descriptions, and should not be construed as being limited to the embodiments set forth herein. It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the scope of this application. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms “upper,” “lower,” “front,” “rear,” “left,” “right,” and similar expressions used in this application are for illustrative purposes only and are not intended to be limiting.

[0019] The ordinal numbers such as "first" and "second" used in this application are merely identifiers and have no other meaning, such as a specific order. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] The specific embodiments of this application will be described in more detail below with reference to the accompanying drawings, which illustrate representative embodiments of this application and are not intended to limit this application.

[0021] like Figure 1 As shown, this application provides a thrust adjustment device 1 for a reusable liquid rocket engine. The thrust adjustment device 1 achieves lower costs by employing a controllable servo motor-driven liquid oxygen auxiliary valve thrust adjustment valve technology. The servo motor adjusts the opening of the liquid oxygen auxiliary valve thrust adjustment valve. The opening control information of the oxygen auxiliary valve thrust adjustment valve is fed back to the engine controller for opening correction, enabling precise adjustment of the launch vehicle engine thrust during flight. This facilitates attitude and orbit control of the rocket body during recovery, meeting the technical requirements of low-cost, reusable rockets.

[0022] The thrust adjustment device 1 for a reusable liquid rocket engine of this application includes a liquid oxygen auxiliary valve thrust adjustment valve and a drive device 20, which drives the liquid oxygen auxiliary valve thrust adjustment valve to operate. The drive device 20 can be configured as a controllable servo actuator. In this way, the liquid rocket engine controller commands and controls the controllable servo actuator and the liquid oxygen auxiliary valve thrust adjustment valve according to the flight conditions. The liquid rocket engine controller forms a closed loop for adjusting the actuation position of the controllable servo motor and the feedback of its position parameters.

[0023] The oxygen auxiliary valve regulating valve 10 includes a valve body assembly 110 and a switching assembly 120, with the switching assembly 120 disposed inside the valve body assembly 110. The valve body assembly 110 is constructed as a hollow chamber. Figure 3 and Figure 4 As shown, the valve body assembly 110 internally comprises a first chamber 111, a second chamber 112, and a valve port 113. The first chamber 111 is located between the second chamber 112 and the valve port 113. The first chamber 111 and the second chamber 112 are connected. The first chamber 111 and the second chamber 112 are connected along the axial direction of the oxygen auxiliary valve push valve 10. The first chamber 111 and the valve port 113 are connected along the axial direction of the oxygen auxiliary valve push valve 10. Fluid from the valve port 113 flows through the first chamber 111 to the second chamber 112.

[0024] The first chamber 111 includes a first small-sized portion 1111 and a first large-sized portion 1112 that are connected to each other. The first small-sized portion 1111 is connected to the valve port 113, and the first large-sized portion 1112 is connected to the second chamber 112. The size of the first large-sized portion 1112 in the radial direction of the oxygen auxiliary valve push valve 10 is larger than the size of the first small-sized portion 1111. In this way, the first small-sized portion 1111 can control the flow rate of the fluid and prevent the flow rate from being too high.

[0025] like Figures 2 to 4As shown, the switching assembly 120 includes a body 121 and a needle body 122, which are connected together. The body 121 and the needle body 122 are connected along the axial direction of the oxygen auxiliary valve push valve 10. The body 121 is located in the second chamber 112. The needle body 122 is located in the first chamber 111. The drive device 20 can drive the switching assembly 120 to move within the valve body assembly 110. In this way, the distance between the needle body 122 and the first chamber 111 can be adjusted to regulate the opening degree of the fluid flow rate, thereby regulating the fluid flow rate.

[0026] The drive device 20 can drive the switch assembly 120 to move toward the valve port 113, with the needle body 122 of the switch assembly 120 in close contact with the first chamber 111 to close the valve port 113. Alternatively, the drive device 20 can drive the switch assembly 120 away from the valve port 113, with the needle body 122 of the switch assembly 120 spaced apart from the first chamber 111 to open the valve port 113. The needle body 122 moves within the first chamber 111. The needle body 122 moves within the first small-sized portion 1111. The distance between the needle body 122 and the first small-sized portion 1111 changes. Thus, by adjusting the opening degree of the fluid flow, the flow rate of the fluid in the first chamber 111 can be changed.

[0027] According to the present application, a thrust regulating device 1 for a reusable liquid rocket engine includes an oxygen auxiliary valve thrust regulating valve 10 and a drive device 20. The oxygen auxiliary valve thrust regulating valve 10 includes a valve body assembly 110 and a switch assembly 120. The valve body assembly 110 has a first chamber 111, a second chamber 112 and a valve port 113. The first chamber 111 includes a first small-sized portion 1111 and a first large-sized portion 1112 that are connected to each other. The first small-sized portion 1111 is connected to the valve port 113, and the first large-sized portion 1112 is connected to the second chamber 112. The switch assembly 120 is disposed inside the valve body assembly 110 and includes a connected body 121 and a needle 122. The body 121 is located in the second chamber 112, and the needle 122 is located in the first chamber 111. The drive device 20 can drive the switch assembly 120 to move within the valve body assembly 110. In this way, the drive device 20 can drive the switch assembly 120 to move toward the first large size portion 1112 to expand the open space of the first chamber 111, thereby increasing the amount of fluid. The drive device 20 can also drive the switch assembly 120 to move toward the valve port 113 to reduce the open space of the first chamber 111, thereby reducing the amount of fluid.

[0028] Furthermore, such as Figure 3 and Figure 4As shown, the first chamber 111 also includes a chamber wall 114, which extends inwardly at an inclination toward the valve port 113. The chamber wall 114 is constructed as an inclined wall surface. The chamber wall 114 is inclined from the second chamber 112 along the axial direction of the oxygen auxiliary valve push valve 10 toward the central axis of the valve port 113. As a result, a first small-sized portion 1111 and a first large-sized portion 1112 can be formed, causing the size of the first chamber 111 along the radial direction of the oxygen auxiliary valve push valve 10 to change the opening degree of the fluid flow, thereby making the flow velocity and quantity of the fluid passing through the first chamber 111 different.

[0029] Furthermore, the cavity wall 114 includes a first end 1141 and a second end 1142, which are located at opposite ends of the cavity wall 114 along the axial direction of the oxygen auxiliary valve push valve 10. The first end 1141 is closer to the valve port 113 than the second end 1142. The first end 1141 forms a first small-sized portion 1111. The second end 1142 forms a first large-sized portion 1112. Fluid from the valve port 113 can flow from the first end 1141 to the second end 1142. Fluid from the valve port 113 flows from the first small-sized portion 1111 to the first large-sized portion 1112. The first small-sized portion 1111 can control the amount of fluid to prevent excessive fluid flow.

[0030] The needle body 122 can move between a closed position and an open position along the axial direction of the main body 121. The needle body 122, located in the open position, can move to the closed position. The needle body 122 moves along the axial direction of the main body 121 toward the valve port 113 to the closed position. The needle body 122, located in the closed position, is in close contact with the cavity wall 114 to close the valve port 113. The needle body 122, located in the closed position, can move to the open position. The needle body 122 moves along the axial direction of the main body 121 away from the valve port 113 to the open position. The needle body 122, located in the open position, is spaced apart from the cavity wall 114 to open the valve port 113. In this way, the actuation position of the controllable servo motor corresponds to the needle-type opening adjustment cone of the liquid oxygen auxiliary valve, adjusting the distance L between the needle-type opening adjustment cone and the mechanical wall of the valve body, thereby regulating the liquid oxygen flow rate of the oxygen auxiliary pipeline.

[0031] The needle body 122 includes a second smaller portion 1221 located within a first smaller portion 1111. The dimensions of the second smaller portion 1221 match those of the first smaller portion 1111. The needle body 122 includes a needle wall 123 facing the cavity wall 114 of the first chamber 111. The needle wall 123 is parallel to the cavity wall 114. The second smaller portion 1221 is movable between a closed position and an open position. In the closed position, the second smaller portion 1221 of the needle body 122 is in close contact with the cavity wall 114 of the first chamber 111. In particular, in the closed position, the second smaller portion 1221 of the needle body 122 is in close contact with the first end 1141. Thus, in the closed position, the second smaller portion 1221 can seal the valve port 113, preventing fluid flow. The second smaller portion 1221 of the needle body 122, located in the open position, is spaced apart from the cavity wall 114 of the first chamber 111. Specifically, the second smaller portion 1221 of the needle body 122, located in the open position, is spaced apart from the first end 1141. Thus, the second smaller portion 1221, located in the open position, can open the valve port 113, allowing fluid to flow. Fluid can flow into the second chamber 112 through the space opened by the first smaller portion 1111.

[0032] The needle body 122 also includes a second large-size portion 1222, which is connected to the second small-size portion 1221 along the axial direction of the oxygen auxiliary valve push valve 10. The size of the second large-size portion 1222 matches the size of the first large-size portion 1112. The second large-size portion 1222 is movable between a closed position and an open position. In the closed position, the second large-size portion 1222 of the needle body 122 is in close contact with the cavity wall 114 of the first chamber 111. In particular, in the closed position, the second large-size portion 1222 of the needle body 122 is in close contact with the second end 1142. Thus, in the closed position, the second large-size portion 1222 can block the first chamber 111 and prevent fluid flow. In the open position, the second large-size portion 1222 of the needle body 122 is spaced apart from the cavity wall 114 of the first chamber 111. In particular, in the open position, the second large-size portion 1222 of the needle body 122 is spaced apart from the second end 1142. Thus, the second large-size portion 1222, located in the open position, can open the first chamber 111, allowing fluid to flow. Fluid can flow through the space opened by the first large-size portion 1112 into the second chamber 112.

[0033] A gap exists between the needle body 122 and the cavity wall 114. The gap extends inwardly at an angle toward the valve port 113. The gap is constructed at an angle. The gap is inclined from the second chamber 112 toward the central axis of the valve port 113 along the axial direction of the oxygen auxiliary valve push valve 10. The needle body 122 moves toward the valve port 113 to narrow the gap. The needle body 122 moves away from the valve port 113 to widen the gap. As a result, the dimension of the first chamber 111 along the radial direction of the oxygen auxiliary valve push valve 10 changes, thereby causing the flow rate and volume of the fluid passing through the first chamber 111 to differ.

[0034] To further control the fluid flow rate, valve port 113 includes a third smaller portion 1131 and a third larger portion 1132, which are connected along the axial direction of the oxygen auxiliary valve push valve 10. The third smaller portion 1131 is closer to the first chamber 111 than the third larger portion 1132. The third smaller portion 1131 is connected to the first smaller portion 1111. The third larger portion 1132 is larger than the third smaller portion 1131 along the radial direction of the oxygen auxiliary valve push valve 10. Thus, the third smaller portion 1131 can control the fluid flow rate and prevent excessive flow.

[0035] The third large-size section 1132 is externally connected to the oxygen auxiliary valve regulating valve 10. The oxygen auxiliary valve regulating valve 10 also includes a liquid oxygen inlet 130, which is connected to the third large-size section 1132. Liquid oxygen flows through the liquid oxygen inlet 130 to the valve port 113 and enters the first chamber 111 through the valve port 113. The first chamber 111 can regulate the flow rate and amount of liquid oxygen. The drive device 20 can drive the needle body 122 to move, thereby changing the open space in the first chamber 111. The gap between the needle body 122 and the cavity wall 114 of the first chamber 111 changes, thereby regulating the flow rate and amount of liquid oxygen. The drive device 20 can drive the needle body 122 to move towards the first large-size section 1112 to expand the open space of the first chamber 111, thereby increasing the amount of liquid oxygen. The drive unit 20 can drive the needle body 122 to move toward the valve port 113 to reduce the open space of the first chamber 111, thereby reducing the amount of liquid oxygen.

[0036] The oxygen auxiliary valve 10 also includes a liquid oxygen outlet 140, which is connected to the second chamber 112. Fluid from the first chamber 111 can flow through the second chamber 112 to the liquid oxygen outlet 140 and be discharged through the liquid oxygen outlet 140. In particular, liquid oxygen from the first chamber 111 can flow through the second chamber 112 to the liquid oxygen outlet 140 and be discharged through the liquid oxygen outlet 140.

[0037] like Figure 1 and Figure 5As shown, the drive device 20 includes a motor 210, a rotating member 220, and a moving member 230, with the moving member 230 threadedly connected to the rotating member 220. The rotating member 220 is sleeved onto the moving member 230. The motor 210 can drive the rotating member 220 to rotate, thereby causing the moving member 230 to move along the axial direction of the main body 121. The motor 210 can be a servo motor, which is technically stable and low in cost. The rotating member 220 can rotate about the axial direction of the moving member 230. The axial direction of the moving member 230 is parallel to the axial direction of the main body 121. The moving member 230 can be constructed as a lead screw. The rotating member 220 can be constructed as a lead screw nut. The motor 210 includes an output shaft, which is connected to the lead screw nut via a gear assembly. The principle of the rotating member 220 driving the moving member 230 to move linearly is similar to that of a conventional lead screw nut driving a lead screw, and will not be described in detail here.

[0038] The movable component 230 is connected to the main body 121. The movable component 230 moves along the axial direction of the main body 121, thereby causing the main body 121 to move along the axial direction of the main body 121. The movable component 230 can be connected to the main body 121 via a coupling. The movement of the movable component 230 causes the main body 121 to move, which in turn causes the needle body 122 to move. The needle body 122 moves along the axial direction of the main body 121 to open or close the valve port 113.

[0039] The adjustment process of the thrust adjustment device 1 for a reusable liquid rocket engine in this application is as follows: The pressure of the liquid rocket engine thrust chamber was obtained during ground-based liquid rocket engine test firing.

[0040] The reference value is calculated based on the liquid oxygen auxiliary valve push valve opening table, the thrust chamber pressure given by the guidance system, and the thrust chamber pressure command, and then the controllable servo operation command of the liquid oxygen auxiliary valve push valve is obtained.

[0041] The engine controller precisely calculates the controllable servo motor command for the liquid oxygen auxiliary valve thrust adjustment valve, and transmits the controllable servo motor command to the controllable servo motor via RS422 protocol. The controllable servo motor executes the position command to rotate at a specified angle. The rotation angle of motor 210 is mechanically converted into axial movement of the mechanical actuation part by the controllable servo actuator, thereby causing the connected pin-type opening adjustment cone to move axially, changing the distance L between the pin wall 123 (the inclined part of the cone) and the cavity wall 114 (the conical concave surface of the valve body), changing the flow rate of liquid oxygen entering the valve body through the liquid oxygen inlet 130 and traveling a distance L to the liquid oxygen outlet 140, thereby regulating the amount of liquid oxygen entering the liquid rocket engine combustion generator and thus adjusting the engine thrust.

[0042] The thrust adjustment device 1 for a reusable liquid rocket engine disclosed in this application allows the reusable liquid rocket engine system to adjust its thrust with only a single control command, reducing the computational burden on the program system. The thrust adjustment device 1 is axially connected to the controllable servo actuator and the liquid oxygen auxiliary valve thrust adjustment valve via a mechanical interface, making the technology mature, reliable, and easy to maintain.

[0043] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Terms such as “part” or “component” appearing herein can refer to a single part or a combination of multiple parts. Terms such as “installation” or “installation” appearing herein can refer to one component being directly attached to another component or one component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0044] This application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A thrust regulating device for a recoverable liquid rocket engine, characterized in that, The thrust adjustment device includes an oxygen auxiliary valve adjusting valve and a drive device, wherein the oxygen auxiliary valve adjusting valve includes: A valve body assembly, wherein the valve body assembly internally comprises a first chamber, a second chamber, and a valve port, the first chamber including a first small-sized portion and a first large-sized portion that are connected to each other, the first small-sized portion being connected to the valve port, and the first large-sized portion being connected to the second chamber; and A switching assembly is disposed inside the valve body assembly. The switching assembly includes a connected body and a needle body. The body is located in the second chamber, and the needle body is located in the first chamber. The drive device is capable of driving the switch assembly to move within the valve body assembly.

2. The thrust adjustment device according to claim 1, characterized in that, The first chamber also includes a chamber wall that extends inwardly toward the valve port.

3. The thrust adjustment device according to claim 2, characterized in that, The cavity wall includes a first end and a second end, the first end being closer to the valve port than the second end, the first end forming a first small-sized portion around the first end, and the second end forming a first large-sized portion around the first end.

4. The thrust adjustment device according to claim 2, characterized in that, The needle body can move between a closed position and an open position along the axial direction of the main body. The needle body, in the closed position, is in close contact with the cavity wall to close the valve port. The needle body, located in the open position, is spaced apart from the cavity wall to open the valve port.

5. The thrust adjustment device of claim 4, wherein, The needle body includes a second smaller portion, and the cavity wall includes a first end. The second smaller portion of the needle body, located in the closed position, fits tightly against the first end. The second small portion of the needle body located in the open position is spaced apart from the first end.

6. The thrust adjustment device of claim 5, wherein, The needle body also includes a second large-sized portion connected to the second small-sized portion, and the cavity wall includes a second end. The second large-sized portion of the needle body, located in the closed position, is in close contact with the second end. The second large-sized portion of the needle body located in the open position is spaced apart from the second end.

7. The thrust adjustment device of claim 2, wherein, There is a gap between the needle body and the cavity wall. The needle moves toward the valve port to reduce the gap. The needle moves away from the valve opening to widen the gap.

8. The thrust adjustment device of claim 1, wherein, The valve port includes a third small-sized portion and a third large-sized portion that are connected to each other, and the third small-sized portion is closer to the first chamber than the large-sized portion.

9. The thrust adjustment device according to claim 8, characterized in that, The oxygen auxiliary valve push valve also includes a liquid oxygen inlet and a liquid oxygen outlet. The liquid oxygen inlet is connected to the third large-size part, and the liquid oxygen outlet is connected to the second chamber.

10. The thrust adjustment device of claim 1, wherein, The driving device includes a motor, a rotating component, and a moving component. The moving component is threadedly connected to the rotating component and is connected to the main body. The motor can drive the rotating component to rotate, thereby causing the moving component to move along the axial direction of the main body.

Images