A stop valve, a rocket engine and a rocket

Abstract

The embodiment of the present application provides a kind of stop valve, rocket engine and rocket, including valve body, the medium passage for making medium flow is opened in valve body, the front part of medium passage inside is provided with the valve core that can be axially moved;Valve core inside is axially provided with the valve core passage that is communicated with medium passage;The rear part of valve body is also provided with the valve seat that opens or closes valve core passage.This technical solution, hollow structure valve core can become medium flow passage, while unloading and control structure is located in the outside of medium flow channel, can effectively reduce radial dimension, so that the structure of high-pressure stop valve is more compact, lighter.

Description

Technical Field

[0001] This invention relates to the field of launch vehicle technology, and in particular to a shut-off valve, a rocket engine, and a rocket. Background Technology

[0002] High-pressure shut-off valves are commonly used components in rocket engines, used to control the flow of high-pressure media (liquid or gas) in pipelines. Existing high-pressure shut-off valves are relatively large and heavy, making their installation in rocket engines difficult. Therefore, miniaturization and weight reduction of high-pressure shut-off valves are problems that need to be solved. Summary of the Invention

[0003] This invention provides a shut-off valve, a rocket engine, and a rocket, to achieve miniaturization and weight reduction of the shut-off valve, making it more suitable for rocket engines.

[0004] To achieve the above objectives, in one aspect, embodiments of the present invention provide a shut-off valve, including a valve body, a medium channel for medium flow is provided in the valve body, a movable valve core is provided in the medium channel; a valve core channel communicating with the medium channel is provided inside the valve core; and a valve seat for opening or closing the valve core channel is also provided in the medium channel.

[0005] Furthermore, the valve core includes a valve core head section, a valve core middle section, and a valve core tail section arranged sequentially, with the outlet end of the valve core channel located inside the valve core tail section; the outer diameter of the valve core head section is larger than the outer diameter of the valve core tail section, and the outer diameter of the valve core tail section is larger than the outer diameter of the valve core middle section; the front end face of the valve seat is the valve seat sealing surface; the medium channel includes an outlet cavity located at the rear of the valve body, with both the valve seat sealing surface and the valve core tail section located inside the outlet cavity, and a gap is left between the inner wall of the outlet cavity and the outer wall of the valve seat sealing surface, and a gap is left between the inner wall of the outlet cavity and the outer wall of the valve core tail section.

[0006] Furthermore, the rear end of the valve core tail section has a tail end face, which is an annular plane; the valve seat sealing surface is a plane; and an end face sealing ring matching the tail end face is provided on the valve seat sealing surface.

[0007] Furthermore, one end of the valve body is connected to a connector, which has a medium inlet that communicates with the medium channel; the other end of the valve body is connected to a valve seat, which has a medium outlet that communicates with the medium channel.

[0008] Furthermore, the medium outlet is located on the valve seat and does not penetrate the valve seat sealing surface; the valve seat also has an oblique hole, the two ends of which are connected to the outlet cavity and the medium outlet, respectively.

[0009] Furthermore, an elastic device is provided between the valve core and the connecting nozzle.

[0010] Furthermore, the shut-off valve also includes a piston sleeved on the outside of the valve core; the medium passage also includes a piston cavity; the piston includes a piston base and a piston shoulder fixedly connected to the outer periphery of the piston base, the piston base is detachably connected to the valve core, the piston shoulder is sleeved in the piston cavity, and the length of the piston cavity is greater than the length of the piston shoulder; when the valve core is in the closed position, a preset gap is left between the tail end of the piston shoulder and the rear end of the piston cavity.

[0011] Furthermore, a control air passage is provided on the valve body, which passes through the side wall of the valve body and connects to the rear of the piston chamber.

[0012] Furthermore, an exhaust passage is provided on the valve body, which penetrates the side wall of the valve body and is connected to the front end of the piston chamber.

[0013] Meanwhile, embodiments of the present invention also provide a rocket engine, including engine piping and a pre-existing unloading high-pressure shut-off valve, the unloading high-pressure shut-off valve being connected to the engine piping.

[0014] Furthermore, embodiments of the present invention also provide a rocket, including a rocket engine, wherein the rocket engine is provided with a shut-off valve as described above.

[0015] The above technical solution has the following beneficial effects: The gate valve in this technical solution employs a hollow valve core structure, meaning that a valve core channel is set inside the valve core to connect with the medium flow path. This valve core channel serves as a flow passage for the medium, and the valve core channel can be opened or closed via a valve seat located within the medium flow path. This layout allows for a more compact structure of other internal valve components, resulting in high space utilization. It effectively reduces the radial dimension of the gate valve, making the product smaller and lighter, thus achieving a good result in the miniaturization and weight reduction of high-pressure gate valves. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a shut-off valve in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal cavities of the valve body and the connecting nozzle in an embodiment of the present invention; Figure 3 This is a schematic diagram of the medium flow in the cutoff state in an embodiment of the present invention; Figure 4This is a schematic diagram of the medium flow in the conductive state in an embodiment of the present invention; Figure 5 This is a schematic diagram of another arrangement of the medium outlet in an embodiment of the present invention; Icon labels: 1. Connecting nozzle; 11. Medium inlet; 12. Elastic device receiving cavity; 13. Inlet cavity; 2. Elastic device; 3. Piston; 31. Piston base; 32. Piston shoulder; 4. Valve body; 41. Medium passage; 411. Valve core receiving cavity; 412. Outlet cavity; 413. Piston cavity; 42. Control air passage; 43. Exhaust passage; 46. Valve body medium outlet; 5. Valve core; 51. Valve core channel; 52. Valve core head section; 53. Valve core middle section; 54. Valve core tail section; 541. Tail end face; 6. Valve seat; 61. Medium outlet; 62. Inclined hole; 63. End face sealing ring; 64. Valve seat sealing surface; 71. First energy storage sealing ring; 72. Second energy storage sealing ring; 73. Third energy storage sealing ring; 74. Fourth energy storage sealing ring; 75. Fifth energy storage sealing ring; 76. Sixth energy storage sealing ring Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, this embodiment of the invention provides a shut-off valve, including a valve body 4 and a valve core 5 sleeved inside the valve body 4. The valve body 4 has an axial medium channel 41 (or cavity, including multiple cavities such as a valve core receiving cavity 411 and an outlet cavity 412 described later) inside. The valve core 5 can move axially within the medium channel 41. In this technical solution, the valve core 5 has a hollow structure with an axially arranged valve core channel 51 inside. The valve core channel 51 passes through the front and rear end faces of the valve core 5 and can be used to allow the medium to pass through. A valve seat 6 is also provided at the rear part inside the medium channel 41 for opening or closing the outlet end of the valve core channel 51.

[0020] To address the aforementioned problems, this invention provides a shut-off valve. A valve core 5, capable of axial movement, is installed within the medium channel 41. Unlike conventional valve cores, the valve core 5 has a hollow internal structure, forming a valve core channel 51 for the flow of the medium. When the tail end of the valve core channel (i.e., the tail end face 541 described later) abuts against the front side of the valve seat 6 (i.e., the valve seat sealing surface 64 described later), the outlet end of the valve core channel 51 is shut off, preventing the medium inside the valve core channel 51 from being output; that is, the valve core 5 is in a closed state at this time. However, when an external force causes the valve core 5 to move forward (i.e., to the left in the figure) along the axial direction of the valve core receiving cavity 411, the tail end of the valve core channel can separate from the valve seat sealing surface 64, forming a certain gap. At this time, the outlet end of the valve core channel 51 is opened, allowing the medium inside the valve core channel 51 to be output outward through this gap; that is, the valve core 5 is in an open state at this time. During the opening process, the valve core 5 moves forward, so the medium flow direction is opposite to the opening direction of the valve core 5, which is completely different from the forward scheme of existing products. However, the force state of the valve core is the same as that of the forward scheme of existing technology (the medium flow direction of existing products is the same as the movement direction of the valve core when it is opened, which is called the forward scheme). This constitutes an atypical forward scheme. With this structural form, the medium no longer flows along the outside of the valve core 5, but flows directly inside the valve core 5, effectively utilizing the internal space, reducing the radial dimension of the product, and thus effectively reducing the weight of the product. This helps to simplify the overall assembly structure of the rocket engine and reduce the weight of the rocket engine, making it more suitable for configuration and application in rocket engines.

[0021] Furthermore, due to the unique hollow valve core structure in this design, the overall structure of the shut-off valve can be designed as a slender cylinder, with the inlet and outlet directions aligned on the same axis. The resulting slender shape allows for better integration with engine piping, providing more options for piping layout during rocket engine assembly. Additionally, the central valve core channel 51 reduces the biasing force of the medium on the valve core 5 during operation, resulting in higher reliability of the valve core 5's operation.

[0022] Furthermore, existing products lack the function of reliable shut-off under reverse pressure, only achieving unidirectional shut-off. Therefore, this technical solution incorporates the following design: the valve core 5 includes a valve core head section 52, a valve core middle section 53, and a valve core tail section 54 fixedly connected from front to back; the outlet end of the valve core channel is located inside the valve core tail section 54; the outer diameter of the valve core head section 52 (see...) Figure 1 The diameter dimension A in the middle is greater than the outer diameter of the valve core tail section 54 (see Figure 1 The diameter C in the figure can be selected as the mean diameter of the tail end face 541 in practical applications. The outer diameter of the tail section 54 of the valve core is larger than the outer diameter of the middle section 53 of the valve core (see Figure 1(The diameter dimension B in the text is missing). The front end face of the valve seat 6 is the valve seat sealing surface 64; the medium passage 41 includes an outlet cavity 412 located at the rear of the valve body 4. The valve seat sealing surface 64 and the valve core tail section 54 are both located within the outlet cavity 412, and a gap is left between the inner wall of the outlet cavity 412 and the outer wall of the valve seat sealing surface 64, and a gap is left between the inner wall of the outlet cavity 412 and the outer wall of the valve core tail section 54, so that the medium can fill the gap and flow along the gap. (The outlet cavity 412 can be a cylindrical cavity with equal front and rear diameters, or it can be like...) Figure 1 , Figure 2 As shown, a stepped cavity is formed by a front chamber and a rear chamber. The front chamber has a smaller diameter, while the rear chamber has a larger diameter. The diameter of the front chamber is smaller than the outer diameter of the valve seat sealing surface 64 but larger than the outer diameter of the valve core tail section 54. The diameter of the rear chamber is larger than the outer diameter of the valve seat sealing surface 64. In other words, in this technical solution, the unloading and control structure of the gate valve is located outside the valve core channel 51. Combined with the reasonable setting of the dimensions at points A, B, and C, unloading can be effectively achieved. This ensures that the direction of the unbalanced force of the inlet and outlet media is the same as the closing direction of the valve core 5, allowing for reliable closure under reverse pressure. This achieves bidirectional shut-off, ensuring that it will not accidentally open in the reverse direction. At the same time, this design also improves the reliability of the valve core 5's operation. The principle of unloading is explained in detail in the corresponding description in the attached specific embodiments.

[0023] Meanwhile, due to its unique unloading structure, the force exerted by the valve core 5 on the valve seat 6 is very small even when operating under very high pressure. Therefore, a non-metallic end face sealing ring 63 can be used, improving the sealing performance and thus achieving high-pressure resistance. Traditional valves, lacking an unloading structure, cannot use non-metallic materials for sealing and can only use metal-to-metal seals, resulting in poor sealing performance and making it difficult to withstand high pressure.

[0024] like Figure 1 , Figure 2 As shown, the tail section 54 of the valve core should be located in the outlet cavity 412, the middle section 53 of the valve core is sleeved in the valve core receiving cavity 411, and the head section 52 of the valve core (including the piston base 31 connected to the outer side of the head end) can be placed in the inlet cavity 13 opened in the connecting pipe 1 described later.

[0025] Furthermore, the rear end of the valve core tail section 54 has a tail end face 541 (the outlet end of the valve core channel 51 is the flow channel inside the tail end face 541), which is an annular plane; the valve seat sealing surface 64 is a plane, that is, the valve core 5 and the valve seat 6 adopt a plane-to-plane end face seal. An annular sealing ring groove is opened on the front side of the valve seat sealing surface 64, and an end face sealing ring 63 matching the tail end face 541 is installed in the sealing ring groove. By setting the end face sealing ring 63 made of non-metallic material, the sealing performance can be effectively improved, ensuring that the valve core 5 can be closed tightly, that is, ensuring that there is no leakage between the outlet end of the valve core channel and the front side of the valve seat sealing surface 64.

[0026] In addition, the flow channel in the tail section 54 of the valve core is preferably a conical structure with a smaller front and a larger rear, which is more conducive to the flow of the medium to the side gap and reduces resistance.

[0027] Furthermore, to facilitate connection to external pipelines, in addition to the valve seat 6 being connected to one end of the valve body 4, a connecting nozzle 1 can also be installed on the other end of the valve body 4. That is, the external structure of the valve is composed of three parts: the connecting nozzle 1, the valve body 4, and the valve seat 6. The valve body 4 and the connecting nozzle 1, and the valve body 4 and the valve seat 6 are connected in a detachable manner (e.g., Figure 1 (As shown in the diagram, the connection is made via external bolts). In this case, a central hole that runs through the front and back can be opened in the middle of the connector 1 as a medium inlet 11. The rear of the valve body 4 is also provided with a medium outlet 61 that communicates with the medium channel 41.

[0028] Furthermore, the medium outlet 61 is located on the valve seat 6, and the medium outlet 61 can be like... Figure 1 It can be coaxially arranged with the valve core channel 51, or it can be in other forms. For example... Figure 1 As shown, the medium outlet 61 is a blind hole (the front end does not penetrate the valve seat sealing surface 64; in this case, the valve seat sealing surface 64 is located between the valve core channel 51 and the medium outlet 61). To allow the valve core channel 51 to communicate with the medium outlet 61, an oblique hole 62 can be opened on the valve seat 6. The medium flowing out from the outlet end of the valve core channel can flow laterally into the outlet cavity 412, and then flow into the medium outlet 61 through the oblique hole 62, thus outputting a high-pressure shut-off valve. Figure 1 As shown, there can be multiple inclined holes 62, which are evenly distributed circumferentially.

[0029] In addition, the outlet of the gate valve can also take another different form, such as Figure 5 As shown, at this time, the valve seat 6 of the shut-off valve does not have a medium outlet 61. Instead, a valve body medium outlet 46 is directly opened at the rear end of the valve body 4. The valve body medium outlet 46 is located in front of the valve seat sealing surface 64, and the axis of the valve body medium outlet 46 is perpendicular to the axis of the valve core channel 51, thereby meeting the specific flow direction requirements.

[0030] Furthermore, the preferred form of this unloading high-pressure shut-off valve should be normally closed, meaning that the valve core 5 should be in the closed state when no external force pushes it to move. For this purpose, an elastic device receiving cavity 12 can be provided inside the connector 1, and the elastic device receiving cavity 12 can be connected to the front side of the inlet cavity 13. An axially arranged elastic device 2 (preferably a spring, but other forms are also possible) is provided inside this elastic device receiving cavity 12. The front end of the elastic device 2 abuts against the front wall of the elastic device receiving cavity 12, and the rear end abuts against the front face of the valve core 5. When no external force pushes it, the combined force of the elastic device force and the medium (see the detailed explanation in the subsequent specific examples) will push the valve core 5 backward, causing the tail end face 541 to press tightly against the end face sealing ring 63. Only when the external force applied to the valve core 5 can overcome the combined force of the elastic device force and the medium can the valve core 5 be pushed forward, putting the valve core 5 in the open state.

[0031] Furthermore, the external force used to drive the valve core 5 to open can take many forms. For example, an electromagnetic coil can be installed on the outside of the valve body 4, and the valve core 5 can be moved by electromagnetic force. In this application, in order to minimize the product size and weight, a more efficient control method is adopted, namely, a piston 3 is connected to the outside of the valve core 5. Figure 3 As shown, piston 3 is fixedly connected to piston base 31 and piston shoulder 32. Piston shoulder 32 protrudes from the outer side of piston base 31. The inner side of piston base 31 has internal threads for connecting with the external thread section provided on valve core 53. The outer side of piston shoulder 32 and piston cavity 413 are fitted with a shaft hole, allowing piston shoulder 32 to move back and forth in piston cavity 413. A preset gap is always maintained between the rear part of piston shoulder 32 and the rear end face of piston cavity 413 (at this time, the tail end face 541 abuts against valve seat sealing surface 64, and piston 3 cannot continue to move backward). In this way, when external control gas with a set pressure enters the rear part of piston cavity 413, the control gas can generate a pressure on the rear side of piston shoulder 32. This pressure pushes piston shoulder 32 forward, thereby causing the entire valve core 5 to move forward.

[0032] Furthermore, to facilitate the injection of control gas into the rear of the piston chamber 413, such as... Figure 1 , Figure 2 As shown, a control air passage 42 can be opened on the valve body 4. The control air passage 42 passes through the side wall of the valve body 4 and communicates with the rear of the piston chamber 413. In application, after connecting the external pipeline connector that provides control air to the control air passage 42, air can be injected into the piston chamber 413 to increase the pressure.

[0033] The specific operation process is as follows: when the control air is not entering, the shut-off valve is in the closed state, such as... Figure 3As shown, at this time, the tail end face 541 abuts against the valve seat sealing surface 64, and the outlet end of the valve core channel 51 is cut off, preventing the medium in the valve core channel 51 from entering the outlet cavity 412; when control gas is input, the control gas fills the cavity between the rear side of the piston shoulder 32 and the rear side of the piston cavity 413, thereby pushing the valve core 5 forward until the front side of the piston shoulder 32 abuts against the rear side of the piston cavity 413, see Figure 4 At this time, the tail end face 541 separates from the valve seat sealing surface 64, the outlet end of the valve core channel is opened, the medium in the valve core channel 51 flows into the outlet cavity 412, and then flows out through the medium outlet. The entire unloading high pressure shut-off valve is in the open state.

[0034] Furthermore, an exhaust passage 43 is provided on the valve body 4. The exhaust passage 43 passes through the side wall of the valve body 4 and is connected to the front end of the piston chamber 413. The exhaust passage 43 is used to make the front space of the piston chamber 413 communicate with the atmosphere, thereby ensuring that the valve core 5 is not affected by back pressure when it moves forward.

[0035] The components in this technical solution have a simple structure and are easy to manufacture, which can effectively reduce production costs compared to existing high-pressure shut-off valves.

[0036] This invention also provides a rocket engine, including engine piping and a shut-off valve as described above, the shut-off valve being connected to the engine piping.

[0037] The present invention will be described in detail below through a specific embodiment: (See the structural diagram of this specific embodiment.) Figure 1 See the work process. Figure 3 , Figure 4 It consists of a connecting nozzle 1, an elastic device 2, a piston 3, a valve body 4, a valve core 5, a valve seat 6, and an energy storage sealing ring. Among them, the valve seat 6 is a composite of metal and non-metal, consisting of a metal base and a plastic end face sealing ring 63. The valve seat is provided with several oblique holes 62 for communicating the medium outlet 61 with the outside.

[0038] The valve core 5 is hollow, and the central hole of the valve core is the valve core channel 51. During operation, the deflection force of the medium on the valve core 5 is smaller, and the valve core operation is more reliable. The valve core 5 is a pure metal structure.

[0039] The piston base 31 of piston 3 is internally connected to valve core 5 by threads. A first accumulator sealing ring 71 is installed between piston 3, valve core 5, and connector 1, simultaneously sealing two leakage channels between medium inlet 11 and exhaust passage 43, and between medium inlet 11 and control air passage 42. A second accumulator sealing ring 72 is installed between piston 3 and valve body 4, sealing the leakage channel between control air passage 42 and exhaust passage 43. A third accumulator sealing ring 73 is installed between piston 3 and valve core 5, sealing the leakage channel between control air passage 42 and medium inlet 11. A fourth accumulator sealing ring 74 and a fifth accumulator sealing ring 75 are installed between valve body 4 and valve core 5, sealing two leakage channels between control air passage 42 and medium outlet. A sixth accumulator sealing ring 76 is installed between valve body 4 and valve seat 6, sealing the external leakage channel of valve seat 6.

[0040] like Figure 1 As shown, the inlet medium pressure P1 acts on the valve core 5 and piston 3 assembly, with an effective area of ​​S. A -S C (where S) A for Figure 1 The outer diameter of the front section of the middle valve core 5 is the area at point A, S C for Figure 1 The area at the mid-diameter (φC) of the end face 541 of the mid-tail section, the applied force F1 = P1 × (S A -S C The direction is the closing direction of valve core 5; the outlet medium pressure P2 acts on valve core 5 (after the outlet medium enters the outlet cavity 412, it can act on the front side of the valve core tail section 54, generating a backward force, the area of ​​which the backward force acts is S). C The effective area is S C -S B The force F2 = P2 × (S) C -S B (where S) B for Figure 1 The outer diameter of the middle section of valve core 5 is the area at point B, and its direction is the closing direction of valve core 5. This design establishes the basic principle of double cutoff and achieves the unloading function. The elastic force Fs of elastic device 2 is in the closing direction of valve core 5 (to the right). Control air pressure P3 acts on piston 3, with an area of ​​S. D -S B (where S) D for Figure 1 (area of ​​the outer edge of piston 3), and the applied force F3 = P3 × (S D -S B The direction is the opening direction of valve core 5. The exhaust passage 43 connects the piston chamber 413 on the right (rear) side of piston 3 to the atmosphere, eliminating the influence of back pressure. Therefore, the resultant opening force is F = F3 - F1 - Fs By selecting a suitable S D The numerical values ​​ensure reliable valve opening within the specified inlet medium pressure range. When closed, the medium pressures P1 and P2 act on the valve core 5 and piston 3 assembly, with a force F = F1 + F2 = P1 × (S / s). A -S C ) + P2×(S C -S B The direction is the closing direction of valve core 5, and with the help of the elastic device force Fs, the valve can be reliably closed.

[0041] Initially, the valve core 5 is in the closed position under the action of the elastic device 2 (i.e., the tail end face 541 abuts against the valve seat sealing surface 64), and the medium pressure at the medium inlet 11 helps to maintain the closed state. When it is necessary to open, a certain pressure of control air is introduced into the control air passage 42. The control air pressure pushes the piston 3 and valve core 5 assembly to overcome the force of the elastic device, the force of the inlet medium, and the force of the elastic device to open. The control air is continuously supplied to maintain the valve core 5 in the open state. When closing, the control air passage 42 is de-aired, and the pressure in the bottom of the piston chamber 413 drops to atmospheric pressure. The inlet medium pressure and the force of the elastic device push the piston 3 and valve core 5 assembly to overcome the friction force to close, and maintain the closed state. After closing, the medium outlet pressure rises, and the medium outlet pressure helps to maintain the closed state.

[0042] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the invention.

[0043] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0044] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shut-off valve, characterized in that, Includes a valve body (4), in which a medium channel (41) for medium flow is provided, and a movable valve core (5) is provided in the medium channel (41). The valve core (5) is provided with a valve core channel (51) that communicates with the medium channel (41). The medium channel (41) is also provided with a valve seat (6) for opening or closing the valve core channel (51).

2. The shut-off valve as described in claim 1, characterized in that, The valve core (5) includes a valve core head section (52), a valve core middle section (53) and a valve core tail section (54) arranged in sequence, and the outlet end of the valve core channel (51) is located inside the valve core tail section (54). The outer diameter of the valve core head section (52) is greater than the outer diameter of the valve core tail section (54), and the outer diameter of the valve core tail section (54) is greater than the outer diameter of the valve core middle section (53); The front end face of the valve seat (6) is the valve seat sealing surface (64). The medium channel (41) includes an outlet cavity (412) located at the rear of the valve body (4). The valve seat sealing surface (64) and the valve core tail section (54) are both located in the outlet cavity (412). A gap is left between the inner wall of the outlet cavity (412) and the outer wall of the valve seat sealing surface (64). A gap is left between the inner wall of the outlet cavity (412) and the outer wall of the valve core tail section (54).

3. The shut-off valve as described in claim 2, characterized in that, The rear end of the valve core tail section (54) has a tail end face (541), which is an annular plane; the valve seat sealing surface (64) is a plane; and an end face sealing ring (63) matching the tail end face (541) is provided on the valve seat sealing surface (64).

4. The shut-off valve as described in claim 2, characterized in that, One end of the valve body (4) is connected to a connector (1), and the connector (1) has a medium inlet (11) that communicates with the medium channel (41); the other end of the valve body (4) is connected to a valve seat (6), and the valve seat (6) has a medium outlet (61) that communicates with the medium channel (41).

5. The shut-off valve as described in claim 4, characterized in that, The medium outlet (61) is located on the valve seat (6), and the medium outlet (61) does not penetrate the valve seat sealing surface (64); the valve seat (6) is also provided with an oblique hole (62), and the two ends of the oblique hole (62) are respectively connected to the outlet cavity (412) and the medium outlet (61).

6. The shut-off valve as described in claim 4, characterized in that, An elastic device (2) is provided between the valve core (5) and the connecting nozzle (1).

7. The shut-off valve as described in claim 3, characterized in that, It also includes a piston (3) sleeved on the outside of the valve core (5); The medium channel (41) also includes a piston chamber (413). The piston (3) includes a piston base (31) and a piston shoulder (32) fixedly connected to the outer periphery of the piston base (31). The piston base (31) is detachably connected to the valve core (5). The piston shoulder (32) is sleeved in the piston cavity (413), and the length of the piston cavity (413) is greater than the length of the piston shoulder (32). When the valve core (5) is in the closed position, a preset gap is left between the tail end of the piston shoulder (32) and the rear end of the piston cavity (413).

8. The shut-off valve as described in claim 7, characterized in that, The valve body (4) is also provided with a control air passage (42), which passes through the side wall of the valve body (4) and communicates with the rear of the piston chamber (413).

9. The shut-off valve as described in claim 8, characterized in that, The valve body (4) is also provided with an exhaust passage (43), which passes through the side wall of the valve body (4) and is connected to the front end of the piston chamber (413).

10. A rocket engine, characterized in that, It includes an engine pipeline and a shut-off valve as described in any one of claims 1-9, the shut-off valve being connected to the engine pipeline.

11. A rocket, comprising a rocket engine, characterized in that, The rocket engine is equipped with a shut-off valve as described in any one of claims 1-9.

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