Pneumatic valve and liquid rocket attitude control system

Abstract

This application relates to the field of liquid rocket attitude and orbit control systems, and provides a pneumatic valve and a liquid rocket attitude and orbit control system. The pneumatic valve includes a valve body and a valve core. The valve body includes a liquid outlet, a tank interface, an open valve port, and a close valve port. The valve core includes a valve core body with a cavity and a first sub-valve disposed within the cavity. The front section of the valve core body is positioned in the passageway between the liquid outlet and the tank interface, and the rear section is positioned between the open and close valve ports. A vent hole is located at the rear section of the valve core body and communicates with the open valve port. The rear section of the valve core body has a through hole containing a set of rolling positioning balls. The valve body has a first groove, and the first sub-valve has a second groove. The grooves of the first and second grooves are oriented opposite each other and have the same depth. This application achieves valve opening and closing through air inflation, offering high safety, facilitating production, transportation, and storage, and allowing for repeated use.

Description

Technical Field

[0001] This application belongs to the field of liquid rocket technology, and in particular relates to a pneumatic valve and a liquid rocket attitude and orbit control system. Background Technology

[0002] The attitude and orbit control system (AOR) of a liquid rocket is a propellant management system that controls the satellite to maintain the correct attitude during the separation process from the rocket and into its orbit. The fuel for the liquid rocket attitude and orbit control system is typically stored in tanks. To ensure system safety, the fuel is isolated from pipelines and various valves before launch and then opened.

[0003] In existing technologies, the liquid management valves in traditional liquid rocket attitude and orbit control systems are electro-explosive valves. Their working principle involves using the high-pressure gas generated by the deflagration of an electro-explosive tube to drive a piston, thus opening the valve. Electro-explosive valves are pyrotechnic devices, subject to strict restrictions during production, transportation, storage, and installation. Furthermore, they suffer from drawbacks such as high operational impact, inability to be directly tested, and non-reusability.

[0004] Therefore, there is a need for a valve with moderate operating impact, easy detection of valve opening and closing, and reusability. Summary of the Invention

[0005] This application provides a pneumatic valve, which aims to provide a valve with moderate working impact, easy detection of valve opening and closing, and reusability, which can be used in liquid rocket attitude and orbit control systems.

[0006] The embodiments of this application are implemented as follows: a pneumatic valve includes:

[0007] The valve body is equipped with a liquid outlet, a storage tank interface, an open valve port, and a close valve port that communicate with the inner cavity;

[0008] A valve core is disposed in the inner cavity, and the valve core can slide along the inner cavity. The valve core includes a valve core body with a cavity and a first sub-valve disposed in the cavity. The front section of the valve core body is disposed on the passage between the liquid outlet and the tank interface, and the rear section is disposed between the valve opening port and the valve closing port. The first sub-valve is disposed on the rear section of the valve core body.

[0009] A first sealing structure is provided on the side of the first sub-valve near the front section, and the first sealing structure is disposed between the first sub-valve and the valve core body;

[0010] A vent hole is provided at the rear section of the valve core body, and the vent hole is connected to the valve opening port;

[0011] At least one through hole is provided in the rear section of the valve core body, and a set of locating balls that can roll are provided in the through hole; a first groove is provided on the valve body near the rear section of the valve core body, and a second groove is provided on the first sub-valve; the groove openings of the first groove and the groove openings of the second groove are opposite to each other and have the same groove depth; the sum of the diameters of the set of locating balls is greater than the depth of the through hole and less than the sum of the depth of the through hole and the groove depth of the first groove.

[0012] Preferably, there are multiple through holes, and the multiple through holes are arranged rotationally symmetrically.

[0013] Preferably, the set of positioning balls includes multiple positioning balls, and the multiple positioning balls have the same diameter.

[0014] Preferably, the angle between the sidewall and the bottom wall of the first groove is greater than 90 degrees, and the angle between the sidewall and the bottom wall of the second groove is greater than 90 degrees.

[0015] Preferably, a transition arc surface is provided between the sidewalls and bottom wall of the first groove and the second groove.

[0016] Preferably, the first sub-valve includes a retaining ring, a first spring, and a retaining ring. The retaining ring is engaged with the valve core body, and the retaining ring is sleeved on the first spring. One end of the first spring abuts against the retaining ring, and the other end abuts against the bottom wall of the retaining ring.

[0017] Preferably, the pneumatic valve further includes a second sub-valve, which is disposed at the front section of the valve core body and abuts against the valve core body; the front section of the valve core body is provided with a liquid passage hole communicating with the tank interface.

[0018] Furthermore, the second sub-valve also includes a second spring and a second sealing structure; the second spring is sleeved on the second sub-valve, one end of the second spring abuts against the valve core body, and the other end abuts against the second sub-valve; the second sealing structure is disposed between the second sub-valve and the valve core body.

[0019] Preferably, the pneumatic valve further includes a detection valve, which is disposed on the side of the valve body where the valve opening is located. The detection valve can detect whether the valve core is in contact with the side of the valve body where the valve opening is located.

[0020] This application also provides a liquid rocket attitude and orbit control system, including a liquid tank and the pneumatic valve provided in the above embodiment, wherein the liquid tank is connected to the tank interface.

[0021] The beneficial effects achieved by this application are:

[0022] This application provides a vent hole on the rear section of the valve core body, which is connected to the valve opening port; a through hole is provided on the rear section of the valve core body, and a set of locating balls that can roll are provided in the through hole; a first groove is provided on the valve body near the rear section of the valve core body, and a second groove is provided on the first sub-valve, and the groove openings of the first groove and the groove openings of the second groove are opposite to each other and have the same depth.

[0023] When the pneumatic valve is in the closed state, the valve core blocks the tank interface, closing the passage between the tank interface and the liquid outlet. A set of positioning balls are located in the first groove, preventing the valve core from moving axially in the inner cavity of the valve body, thus keeping the pneumatic valve in the closed state and achieving the locking of the pneumatic valve.

[0024] When the pneumatic valve needs to be opened, air is introduced into the valve opening port. The gas pushes the first sub-valve to move through the vent hole, so that the groove of the first groove is completely aligned with the groove of the second groove. The positioning ball moves out of the first groove and partially enters the second groove, so that the valve core can move towards the valve closing port, thereby connecting the tank interface with the liquid outlet and realizing the opening of the pneumatic valve.

[0025] When the pneumatic valve needs to be closed, air is introduced into the valve port. The gas pushes the valve core to move towards the liquid outlet. During the movement, the openings of the first groove and the second groove are completely aligned. The positioning ball moves out of the second groove and partially enters the first groove. The valve core and the valve body are engaged by the positioning ball, making the valve core unable to move, thus achieving the closure and locking of the pneumatic valve.

[0026] The aforementioned structure enables the pneumatic valve to be locked, opened, and closed without damaging its structure, allowing for repeated use. Furthermore, compared to existing electro-explosive valves, the pneumatic valve exhibits moderate operational impact, facilitates valve opening and closing detection, and is convenient for production, transportation, storage, and installation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the pneumatic valve provided in the embodiment of this application;

[0028] Figure 2 This is a schematic cross-sectional view of the pneumatic valve provided in the embodiment of this application along the AA direction in the first state;

[0029] Figure 3 This is a schematic cross-sectional view of the pneumatic valve provided in the embodiment of this application along the BB direction in the first state;

[0030] Figure 4 This is a schematic cross-sectional view of the pneumatic valve provided in the embodiment of this application along the AA direction in the second state;

[0031] Figure 5This is a schematic cross-sectional view of the pneumatic valve provided in the embodiment of this application along the BB direction in the second state.

[0032] Icon labels:

[0033] 100. Pneumatic valve; 1. Valve body; 10. Inner cavity; 11. Liquid outlet; 12. Tank interface; 13. Open valve port; 14. Close valve port; 15. First groove; 2. Valve core; 20. Valve core body; 201. Cavity; 202. Vent hole; 203. Through hole; 204. Positioning ball; 21. First sub-valve; 211. Second groove; 212. Snap ring; 213. First spring; 214. Retaining ring; 22. First sealing structure; 23. Second sub-valve; 230. Second spring; 231. Second sealing structure; 232. Liquid passage hole; 24. Detection valve. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0035] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., 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.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the 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 the 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" the 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.

[0039] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0040] A liquid rocket attitude and orbit control system is a propellant management system that ensures a satellite maintains the correct attitude during its separation from the launch vehicle and into its orbit. The fuel for a liquid rocket attitude and orbit control system is typically stored in tanks. To ensure system safety, the fuel is isolated from pipelines and various valves before launch. Current technology uses electro-explosive valves for control. Electro-explosive valves are pyrotechnic devices, subject to strict restrictions during production, transportation, storage, and installation. Furthermore, they suffer from drawbacks such as high operational impact, inability to be directly detected, and non-reusability.

[0041] Based on this, this application provides a pneumatic valve with a vent hole on the rear section of the valve core body, which communicates with the valve opening port; a through hole on the rear section of the valve core body, containing a set of rolling positioning balls; a first groove on the valve body near the rear section of the valve core body, and a second groove on the first sub-valve, with the openings of the first and second grooves facing each other and having the same depth. This structure allows for locking, opening, and closing of the pneumatic valve without damaging its structure, enabling repeated use. Furthermore, compared to existing electro-explosive valves, the pneumatic valve has a moderate operating impact, allows for valve opening and closing detection, and facilitates production, transportation, storage, and installation.

[0042] Example 1

[0043] Please see Figures 1-5 The pneumatic valve 100 generally includes a valve body 1 and a valve core 2, which can slide within the inner cavity 10 of the valve body 1. The valve body 1 has a liquid outlet 11, a storage tank interface 12, an open valve port 13, and a close valve port 14 communicating with the inner cavity 10. The valve core 2 is disposed within the inner cavity 10 of the valve body 1 and includes a valve core body 20 and a first sub-valve 21 disposed within the cavity 201. A passage can be formed between the liquid outlet 11 and the storage tank interface 12. The front section of the valve core body 20 is located on the passage formed by the liquid outlet 11 and the storage tank interface 12, and the rear section of the valve core body 20 is disposed between the open valve port 13 and the close valve port 14. The first sub-valve 21 is disposed at the rear section of the valve core body 20.

[0044] In one embodiment, the valve body 1 and the valve core body 20 can be made of titanium alloy, stainless steel or other materials, as long as the compatibility requirements of the working fluid are met.

[0045] Furthermore, a vent hole 202 is provided on the rear section of the valve core body 20, and the vent hole 202 is connected to the valve opening port 13. When gas is introduced through the valve opening port 13, the gas enters the cavity 201 of the valve core 2 through the vent hole 202, which can push the first sub-valve 21 to move closer to the valve closing port 14.

[0046] In one embodiment, a first sealing structure 22 is provided on the rear side of the first sub-valve 21 near the valve core body 20, and the first sealing structure 22 is disposed between the first sub-valve 21 and the valve core body 20. By providing the first sealing structure 22, the rear end of the first sub-valve 21 can be sealed with the valve core body 20. When gas enters the cavity 201 of the valve core 2 through the vent 202, it will not escape from the gap between the first sub-valve 21 and the valve core body 20, allowing the gas to push the first sub-valve 21 towards the valve closing port 14.

[0047] Furthermore, a through hole 203 is provided on the rear section of the valve core body 20, and a set of locating balls 204 that can roll are provided in the through hole 203. A first groove 15 is provided on the valve body 1 near the rear section of the valve core body 2, and a second groove 211 is provided on the first sub-valve 21. The direction of the groove opening of the first groove 15 is opposite to the direction of the groove opening of the second groove 211, and the groove depth of the first groove 15 and the second groove 211 is the same.

[0048] It should be noted that the sum of the diameters of a set of positioning balls 204 is greater than the depth of the through hole 203, but less than the sum of the depth of the through hole 203 and the groove depth of the first groove 15. Since the groove depths of the second groove 211 and the first groove 15 are the same, the sum of the diameters of a set of positioning balls 204 is also less than the sum of the depth of the through hole 203 and the groove depth of the second groove 211.

[0049] When the pneumatic valve 100 is in the closed state, the valve core 2 blocks the tank interface 12, thus blocking the passage between the tank interface 12 and the liquid outlet 11. Figure 4 and Figure 5 As shown, a set of positioning balls 204 are located in the first groove 15, which makes the valve core 2 engage with the valve body 1. Even if the liquid in the tank interface 12 applies a force to the valve core body 20, the valve core 2 cannot move relative to the valve body 1, and thus the pneumatic valve 100 remains in the closed state.

[0050] When the pneumatic valve 100 needs to be opened, gas is introduced into the valve opening port 13. The gas enters the inner cavity 10 of the valve body 1 and enters the cavity 201 through the vent 202. This pushes the first sub-valve 21 to move towards the valve closing port 14. During the movement of the first sub-valve 21, the groove of the second groove 211 can be completely aligned with the groove of the first groove 15. A set of positioning balls 204 can be moved out of the first groove 15 and partially enter the second groove 211. As a result, the locking state between the valve core 2 and the valve body 1 is released. The valve core 2 is pushed by the gas in the inner cavity 10 to move towards the valve closing port 14. As a result, the passage between the tank interface 12 and the liquid outlet 11 is opened, and the liquid can flow from the tank interface 12 to the liquid outlet 11, thus opening the pneumatic valve 100.

[0051] When the pneumatic valve 100 needs to be closed, gas is introduced into the valve port 14. The gas pushes the valve core 2 to move towards the liquid outlet 11. During the movement, the opening of the first groove 15 can be completely aligned with the opening of the second groove 211. A set of positioning balls 204 can be moved out of the second groove 211 and partially enter the first groove 15. When the valve core 2 moves to the point where the valve core body 20 blocks the passage formed by the tank interface 12 and the liquid outlet 11, a set of positioning balls 204 also partially enters the first groove 15. The pneumatic valve 100 is closed, and the valve core 2 and the valve body 1 are engaged by the positioning balls 204, thus locking the pneumatic valve 100.

[0052] The aforementioned structure enables the pneumatic valve to be locked, opened, and closed without damaging its structure, allowing for repeated use. Furthermore, compared to existing electro-explosive valves, the pneumatic valve exhibits moderate operational impact, facilitates valve opening and closing detection, and is convenient for production, transportation, storage, and installation.

[0053] Example 2

[0054] The pneumatic valve 100 provided in this application, based on Embodiment 1, also has the following design:

[0055] There can be multiple through holes 203, arranged rotationally symmetrically. The number of through holes 203 can be two, three, four, five, six, seven, or eight, depending on the size of the pneumatic valve 100 or actual requirements. It should be noted that each through hole 203 includes a set of positioning balls 204. In one embodiment, there are four through holes 203, arranged rotationally symmetrically.

[0056] By setting multiple through holes 203, the force between the first sub-valve 21 and the valve core body 20 can be made uniform, which is beneficial to the locking of the pneumatic valve 100.

[0057] Example 3

[0058] The pneumatic valve 100 provided in this application, based on Embodiment 1, also has the following design:

[0059] Please see Figures 2-5 A set of positioning balls 204 can consist of multiple balls, with adjacent positioning balls 204 abutting each other, and multiple positioning balls 204 disposed in the through hole 203. The number of positioning balls 204 can be set according to actual needs and is not limited here.

[0060] Depending on the structural design of the valve core 2, the length of the through hole 203 will also vary. When the length and width of the through hole 203 differ significantly, the function described in Embodiment 1 cannot be achieved by placing a single positioning ball 204. By setting multiple positioning balls 204, during the opening or closing of the pneumatic valve 100, the positioning ball 204 that abuts against the first groove 15 or the second groove 211 is first subjected to external force and rolls, causing the adjacent positioning balls 204 to roll as well, thereby causing a group of positioning balls 204 to move out of the first groove 15 or the second groove 211 by rolling.

[0061] By setting multiple positioning balls 204, the problem that a single positioning ball 204 cannot move out of the first groove 15 or the second groove 211 and enter the second groove 211 or the first groove 15 through the through hole 203 when the length and width of the through hole 203 differ greatly can be solved.

[0062] In one embodiment, the multiple positioning balls 204 have the same diameter. Positioning balls 204 with the same diameter experience uniform force during movement, resulting in structural stability.

[0063] Example 4

[0064] The pneumatic valve 100 provided in this application, based on Embodiment 1, also has the following design:

[0065] Please see Figures 2-4 The angle between the sidewall and bottom wall of the first groove 15 is greater than 90 degrees, and the angle between the sidewall and bottom wall of the second groove 211 is greater than 90 degrees.

[0066] With the first groove 15 configured as described above, which can partially accommodate the positioning ball 204, when gas is introduced from the valve core body 20 into the valve port 13, a force is applied to the positioning ball 204 towards the valve port 14. This allows the positioning ball 204 to roll more easily along the sidewall of the first groove 15, and when the openings of the first groove 15 and the second groove 211 are completely aligned, it moves out of the first groove 15 and partially enters the second groove 211. The second groove 211, also configured as described above, has similar advantages, which will not be elaborated upon here.

[0067] In one embodiment, a transition arc surface is provided between the sidewalls and bottom wall of the first groove 15 and the second groove 211. When the positioning ball 204 is pushed by the valve core body 20, the first groove 15 and the second groove 211 with the transition arc surface are more conducive to the positioning ball 204 rolling in the first groove 15 or the second groove 211.

[0068] Example 5

[0069] The pneumatic valve 100 provided in this application, based on Embodiment 1, also has the following design:

[0070] Please see Figures 2-5 The first sub-valve 21 includes a retaining ring 212, a first spring 213, and a retaining ring 214. The retaining ring 214 is engaged with the valve core body 20, and the retaining ring 212 is sleeved on the first spring 213. One end of the first spring 213 abuts against the retaining ring 214, and the other end abuts against the bottom wall of the retaining ring 212.

[0071] It should be noted that, since the first sub-valve 21 is located in the cavity 201 of the valve core 20, the length of the cavity 201 is greater than the distance from the outer bottom wall of the retaining ring 212 to the retaining ring 214 when the retaining ring 212 abuts against the retaining ring 214, so that the retaining ring 212 separates from the retaining ring 214 under the elastic force of the first spring 213.

[0072] When gas is introduced through the valve opening port 13, the gas enters the cavity 201 through the vent 202. The gas pushes the retaining ring 212 to move toward the valve closing port 14. During the movement of the retaining ring 212, when the second groove 211 moves until its opening is completely opposite to the opening of the first groove 15, the positioning ball 204 moves out of the first groove 15 and partially enters the second groove 211. The movement of the positioning ball 204 releases the locking state between the valve core 2 and the valve body 1, and the valve core 2 can move toward the valve closing port 14, thus opening the pneumatic valve 100.

[0073] When gas is introduced through the valve port 14, the gas pushes the valve core 2 to move toward the liquid outlet 11. The first spring 213 pushes the retaining ring 212 to move toward the liquid outlet 11. During the movement, the openings of the first groove 15 and the second groove 211 can be completely aligned. The positioning ball 204 moves out of the second groove 211 and partially enters the first groove 15. The positioning ball 204 locks the valve core 2 and the valve body 1. Thus, when the valve core body 20 obstructs the passage formed by the tank interface 12 and the liquid outlet 11, the valve core 2 and the valve body 1 cannot move, thereby locking the pneumatic valve 100.

[0074] By setting a retaining ring 212, a first spring 213, and a retaining ring 214 in the first sub-valve 21, the pneumatic valve 100 can be in the closed state. The first spring 213 applies a force to the first sub-valve 21 in the direction of the liquid outlet 11, so that the second groove 211 is misaligned with the first groove 15. The positioning ball 204 is always located in the first groove 15, preventing the positioning ball 204 from accidentally sliding into the second groove 211, thereby ensuring that the pneumatic valve 100 is always in the closed state.

[0075] Example 6

[0076] The pneumatic valve 100 provided in this application, based on Embodiment 1, also has the following design:

[0077] The pneumatic valve 100 may also include a second sub-valve 23, which is disposed at the front section of the valve core body 20. The front section of the valve core body 20 is provided with a liquid passage hole 232 communicating with the tank interface 12.

[0078] When gas is introduced into the valve opening port 13, the gas enters the valve core 2 and pushes the second sub-valve 23 towards the liquid outlet 11, causing the second sub-valve 23 to open. The tank interface 13 can then communicate with the liquid outlet 11 through an opening formed between the second sub-valve 23 and the valve core 2. Simultaneously, as described in the above embodiment, the valve core 2 moves towards the valve closing port 14. After the pneumatic valve 100 is fully opened, the pressure of the gas entering the valve body 1 from the valve opening port 13 is released. Under the action of the liquid pressure, the second sub-valve 23 retracts to its initial position.

[0079] By setting the second sub-valve 23, a passage with a smaller cross-sectional area can be formed between the storage tank interface 12 and the liquid opening 11 during the opening process of the pneumatic valve 100, which can reduce the pressure when the pneumatic valve 100 is opened and play a buffering role.

[0080] In one embodiment, the second sub-valve 23 further includes a second spring 230 and a second sealing structure 231. The second spring 230 is sleeved on the second sub-valve 23, with one end of the second spring 230 abutting against the valve core body 20 and the other end abutting against the second sub-valve 23.

[0081] The second spring 230 can apply a force to the second sub-valve 23 in the direction of the liquid outlet 11 to prevent the second sub-valve 23 from opening accidentally when the liquid pressure at the tank interface 12 is insufficient.

[0082] Example 7

[0083] The pneumatic valve 100 provided in this application, based on Embodiment 1, also has the following design:

[0084] Please see Figure 2 and Figure 5 The pneumatic valve 100 also includes a detection valve 24, which is disposed on the valve body 1 and on the same side of the valve body 1 as the closing port 14. The detection valve 24 can detect whether the valve core 2 is in contact with the side of the valve body 1 where the closing port 14 is located. When the valve core 2 is in contact with the side of the valve body 1 where the closing port 14 is located, the pneumatic valve 100 is in the open state; when the valve core 2 is not in contact with the side of the valve body 1 where the closing port 14 is located, the pneumatic valve 100 is in the closing or locked state.

[0085] In one embodiment, the detection valve 24 can be a spring-loaded detection valve. The detection valve 24 has an external connector and an internal elastic element and spring-loaded sensor. One end of the connector abuts against the elastic element, and the other end protrudes from the side of the valve body 1 where the valve port 14 is located. When the valve core 2 abuts against the side of the valve body 1 where the valve port 14 is located, the connector is compressed, causing the elastic element to compress. The spring-loaded sensor can detect the change in the elastic force of the elastic element and thus determine the state of the pneumatic valve 100. It should be noted that the detection valve 24 can also determine the positional relationship between the valve core 2 and the valve body 1 in other ways.

[0086] Example 8

[0087] This application provides a liquid rocket attitude and orbit control system, which generally includes a liquid tank and a pneumatic valve 100 provided in the above embodiment, wherein the liquid tank is connected to the tank interface 12 in the pneumatic valve 100. The liquid tank can store liquid fuel used by the rocket, and the liquid fuel in the liquid tank is controlled by the pneumatic valve 100, so that the liquid rocket attitude and orbit control system can control the satellite to ensure that the satellite is in the correct attitude during the separation process from the rocket and into orbit.

[0088] In summary, the pneumatic valve provided in this application, through the structural design described in the above embodiments, can achieve locking, opening, and closing of the pneumatic valve without damaging its structure during the process, and can be reused. Furthermore, compared to existing electro-explosive valves, the pneumatic valve has moderate operating impact, allows for valve opening and closing detection, and facilitates production, transportation, storage, and installation.

[0089] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pneumatic valve, characterized in that, include: The valve body is equipped with a liquid outlet, a storage tank interface, an open valve port, and a close valve port that communicate with the inner cavity; A valve core is disposed in the inner cavity, and the valve core can slide along the inner cavity. The valve core includes a valve core body with a cavity and a first sub-valve disposed in the cavity. The front section of the valve core body is disposed on the passage between the liquid outlet and the tank interface, and the rear section is disposed between the valve opening port and the valve closing port. The first sub-valve is disposed on the rear section of the valve core body. A first sealing structure is provided on the side of the first sub-valve near the rear section, and the first sealing structure is disposed between the first sub-valve and the valve core body; A vent hole is provided at the rear section of the valve core body, and the vent hole is connected to the valve opening port; At least one through hole is provided in the rear section of the valve core body, and a set of locating balls that can roll are provided in the through hole; a first groove is provided on the valve body near the rear section of the valve core body, and a second groove is provided on the first sub-valve; the groove openings of the first groove and the groove openings of the second groove are opposite to each other and have the same groove depth; the sum of the diameters of the set of locating balls is greater than the depth of the through hole and less than the sum of the depth of the through hole and the groove depth of the first groove. The first sub-valve includes a retaining ring, a first spring, and a retaining ring. The retaining ring is engaged with the valve core body. The retaining ring is sleeved on the first spring. One end of the first spring abuts against the retaining ring, and the other end abuts against the bottom wall of the retaining ring. When the pneumatic valve is in the closed state, a set of positioning balls are located in the first groove, causing the valve core to engage with the valve body. When the pneumatic valve needs to be opened, gas is introduced into the valve opening port. The gas enters the inner cavity of the valve body and enters the cavity through the vent hole, pushing the first sub-valve to move towards the valve closing port. During the movement of the first sub-valve, the groove of the second groove can be completely aligned with the groove of the first groove. A set of positioning balls can be moved out of the first groove and partially enter the second groove, thereby releasing the locking state between the valve core and the valve body. The valve core is pushed by the gas in the inner cavity to move towards the valve closing port, thereby opening the passage between the tank interface and the liquid outlet. When the pneumatic valve needs to be closed, gas is introduced into the valve port. The gas pushes the valve core to move towards the liquid outlet. During the movement, the opening of the first groove can be completely aligned with the opening of the second groove. A set of positioning balls can be moved out of the second groove and partially enter the first groove. When the valve core moves to the point where the valve core body blocks the passage formed by the tank interface and the liquid outlet, a set of positioning balls also partially enters the first groove. The pneumatic valve closes, and the valve core and the valve body are engaged by the positioning balls, thus locking the pneumatic valve.

2. The pneumatic valve according to claim 1, characterized in that, There are multiple through holes, and the multiple through holes are arranged in a rotationally symmetrical manner.

3. The pneumatic valve according to claim 1, characterized in that, The set of positioning balls includes multiple positioning balls, and the multiple positioning balls have the same diameter.

4. The pneumatic valve according to claim 1, characterized in that, The angle between the sidewall and bottom wall of the first groove is greater than 90 degrees, and the angle between the sidewall and bottom wall of the second groove is greater than 90 degrees.

5. The pneumatic valve according to claim 1, characterized in that, A transition arc surface is provided between the sidewalls and bottom wall of the first groove and the second groove.

6. The pneumatic valve according to claim 1, characterized in that, It also includes a second sub-valve, which is disposed at the front section of the valve core body and abuts against the valve core body; The valve core body has a liquid passage hole on the front section that communicates with the tank interface.

7. The pneumatic valve according to claim 6, characterized in that, The second sub-valve also includes a second spring and a second sealing structure; The second spring is sleeved on the second sub-valve, with one end of the second spring abutting against the valve core body and the other end abutting against the second sub-valve; The second sealing structure is disposed between the second sub-valve and the valve core body.

8. The pneumatic valve according to claim 1, characterized in that, The pneumatic valve also includes a detection valve, which is located on the side of the valve body where the valve opening is located. The detection valve can detect whether the valve core is in contact with the side of the valve body where the valve opening is located.

9. A liquid rocket attitude and orbit control system, characterized in that, It includes a liquid storage tank and a pneumatic valve as described in any one of claims 1 to 8, wherein the liquid storage tank is connected to the storage tank interface.

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