Pilot valve integrated with buffer function and liquid rocket engine

Abstract

The application provides a pilot valve integrated with a buffering function and a liquid rocket engine, and belongs to the technical field of valves. The pilot valve comprises a valve body, a main valve core, a buffering valve core and a pilot valve core. The valve body is internally provided with a medium channel, the medium channel is provided with an inlet section cavity close to an inlet and an outlet section cavity close to an outlet, the main valve core is slidably arranged in the valve body and is used for opening or closing the medium channel, so that working medium flows from the inlet section cavity to the outlet section cavity or the working medium is cut off in the inlet section cavity, and the valve body is further provided with a first driving device connected with the main valve core and used for driving the main valve core to slide towards a direction of closing the medium channel. The pilot valve integrated with the buffering function of the application realizes the buffering function by adding the buffering valve core, and avoids the problem that a pressure peak is easily generated when the medium channel is directly opened.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a pilot valve and a liquid rocket engine that integrates a buffer function. Background Technology

[0002] In the aerospace field, solenoid valves are generally used to control the opening and closing of gas passages. For example, pilot-operated high-pressure solenoid valves are used to control the opening and closing of gas passages at the inlet and outlet of high-pressure gas cylinders in liquid rockets.

[0003] However, pilot-operated high-pressure solenoid valves have a fast response time and are prone to generating pressure peaks when opened. High pressure may cause impact damage to downstream products.

[0004] In addition, the high-pressure gas cylinders of liquid rockets have a long storage time from being filled to the rated pressure to before launch. The pilot-operated high-pressure solenoid valves need to maintain a continuous seal in a high-pressure environment and still be able to work normally after being sealed for a long time. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the pilot-operated solenoid valve in the prior art is prone to generating pressure peaks when it is opened, thereby providing a pilot valve with integrated buffer function and a liquid rocket engine having it.

[0006] To address the aforementioned technical problems, this invention provides a pilot valve with integrated buffering function, comprising:

[0007] The valve body has an internal medium channel, which has an inlet section cavity near the inlet and an outlet section cavity near the outlet.

[0008] A main valve core is slidably disposed within the valve body for opening or closing the medium channel. The main valve core has a buffer channel with a buffer medium inlet section near the inlet and a buffer medium outlet section near the outlet. When the main valve core is closed, the medium channel is open through the buffer channel. The valve body has a first sliding channel for sliding the main valve core. This first sliding channel forms a first cavity at the tail of the main valve core. The first cavity is connected to the inlet section cavity of the medium channel via a connecting channel and is also connected to the outside via an external outlet.

[0009] A first driving device is connected to the main valve core and is used to drive the main valve core to slide in the direction of closing the medium channel;

[0010] A buffer valve core is slidably disposed within the main valve core for opening or closing the buffer channel; the main valve core has a second sliding channel for sliding the buffer valve core, the second sliding channel forming a second cavity at the tail of the buffer valve core, the second cavity communicating with the first cavity;

[0011] The second driving device is connected to the buffer valve core and is used to drive the buffer valve core to slide in the direction of closing the buffer channel;

[0012] A pilot valve core is slidably disposed in the valve body and is used to open or close the communication channel; when the communication channel is closed, the first cavity is connected to the outside through the external drain port; when the communication channel is opened, the pilot valve core closes the external drain port.

[0013] The third driving device is connected to the pilot valve core and is used to drive the pilot valve core to slide.

[0014] Optionally, the main valve core has a first pressure surface that can contact the medium in the outlet section cavity of the medium channel. When the medium in the outlet section cavity contacts the first pressure surface, it can provide a first force to move the main valve core toward the opening direction.

[0015] The main valve core has a second pressure surface that can contact the medium in the inlet section cavity of the medium channel. When the medium in the inlet section cavity contacts the second pressure surface, it can provide a second force to move the main valve core toward the closing direction.

[0016] The projected area of ​​the first pressure surface in the moving direction of the main valve core is S1, and the projected area of ​​the second pressure surface in the moving direction of the main valve core is S2, wherein S1 > S2.

[0017] Optionally, the main valve core has a third pressure surface that can contact the medium in the inlet section cavity of the medium channel. When the medium in the inlet section cavity contacts the third pressure surface, it can provide a third force to move the main valve core in the opening direction.

[0018] Optionally, a throttle nozzle is detachably provided in the outlet section of the buffer medium.

[0019] Optionally, the buffer medium inlet section is composed of multiple small-hole channels, the diameter of which is smaller than the orifice diameter of the throttling nozzle.

[0020] Optionally, the buffer valve core is made of polyetheretherketone (PEEK) material.

[0021] Optionally, the buffer valve core has a fourth pressure surface that can contact the medium in the buffer channel. When the medium in the buffer channel contacts the fourth pressure surface, it can provide a fourth force to move the buffer valve core toward the opening direction.

[0022] Optionally, the first driving device is a first elastic element, which has an elastic force that drives the main valve core to move in the direction of closing the medium channel.

[0023] Optionally, the second driving device is a second elastic element, which has an elastic force that drives the buffer valve core to move in the closing direction.

[0024] Optionally, the third driving device includes an electromagnetic driving element.

[0025] The present invention provides a liquid rocket engine, comprising: a tank and a thrust chamber, wherein the propellant in the tank enters the thrust chamber through a delivery pipe, and the delivery pipe is connected to a pilot valve with integrated buffer function as described in any of the above embodiments.

[0026] The technical solution of this invention has the following advantages:

[0027] 1. The pilot valve with integrated buffer function provided by the present invention achieves the buffer function by adding a buffer valve core, thus avoiding the problem of pressure peaks that are easily generated when the medium channel is directly opened.

[0028] 2. The pilot valve with integrated buffer function provided by the present invention can adjust the buffer time and improve the buffering effect by replacing the throttle nozzle.

[0029] 3. The pilot valve with integrated buffer function provided by the present invention has the advantages of heat resistance, wear resistance, shock resistance, fatigue resistance and high mechanical strength because the buffer valve core is integrally machined from polyetheretherketone material, and also has a self-lubricating function.

[0030] 4. The pilot valve with integrated buffer function provided by the present invention can effectively prevent excess material from clogging the throttle nozzle and ensure system safety because the buffer medium inlet section of the buffer channel is composed of multiple small orifice channels and the diameter of the small orifice channels is smaller than the orifice diameter of the throttle nozzle.

[0031] 5. The liquid rocket engine provided by the present invention, due to the adoption of the aforementioned pilot valve with integrated buffering function, possesses all the advantages of the pilot valve with integrated buffering function. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a front view of a specific embodiment of a pilot valve with integrated buffer function provided in an embodiment of the present invention;

[0034] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0035] Figure 3 A schematic diagram showing the buffer valve core opening after the pilot valve core closes the flow channel;

[0036] Figure 4 for Figure 3 Enlarged view of region B in the middle;

[0037] Figure 5 A schematic diagram of the main valve core in the open state;

[0038] Figure 6 for Figure 5 A magnified view of region C in the middle.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Valve body; 2. Inlet section cavity; 3. Outlet section cavity; 4. Main valve core; 5. Buffer medium inlet section; 6. Buffer medium outlet section; 7. First cavity; 8. External discharge port; 9. First drive device; 10. Buffer valve core; 11. Second cavity; 12. Second drive device; 13. Pilot valve core; 14. Third drive device; 15. First pressure surface; 16. Second pressure surface; 17. Third pressure surface; 18. Throttle nozzle; 19. Fourth pressure surface; 20. Third elastic element. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] like Figure 1 The diagram illustrates a specific embodiment of the pilot valve with integrated buffer function provided in this embodiment, comprising: a valve body 1, a main valve core 4, a buffer valve core 10, and a pilot valve core 13. The valve body 1 has an internal media channel, which includes an inlet section 2 near the inlet and an outlet section 3 near the outlet. The main valve core 4 is slidably disposed within the valve body 1, used to open or close the media channel, allowing the working medium to flow from the inlet section 2 to the outlet section 3, or to block the working medium within the inlet section 2. The valve body 1 also includes a first driving device 9, connected to the main valve core 4, used to drive the main valve core 4 to slide in the direction of closing the media channel; that is, under the force of the first driving device 9, the main valve core 4 is held in the position of closing the media channel, so that the pilot valve remains normally closed.

[0046] like Figure 2As shown, the main valve core 4 has a buffer channel, which has a buffer medium inlet section 5 near the inlet and a buffer medium outlet section 6 near the outlet. When the main valve core 4 is closed, the medium channel can be opened through the buffer channel. The buffer valve core 10 is slidably disposed in the main valve core 4 to open or close the buffer channel. The main valve core 4 is also provided with a second driving device 12, which is connected to the buffer valve core 10 and is used to drive the buffer valve core 10 to slide in the direction of closing the buffer channel. This arrangement can keep the buffer channel normally closed, thereby ensuring the normally closed state of the pilot valve.

[0047] like Figure 2 As shown, the valve body 1 has a first sliding channel for sliding the main valve core 4. The first sliding channel forms a first cavity 7 at the tail of the main valve core 4. The first cavity 7 is connected to the inlet section cavity 2 of the medium channel through a connecting channel. The first cavity 7 is also connected to the outside through an external outlet 8. With this configuration, by switching the first cavity 7 to be connected to the inlet section cavity 2 or to the outside, the air pressure in the first cavity 7 can be changed, thereby realizing the use of the air pressure difference to drive the main valve core 4.

[0048] like Figure 2 As shown, the main valve core 4 has a second sliding channel for sliding the buffer valve core 10. The second sliding channel forms a second cavity 11 at the tail of the buffer valve core 10. The second cavity 11 is connected to the first cavity 7. This arrangement ensures that the air pressure in the first cavity 7 and the second cavity 11 remains consistent. Therefore, when the air pressure in the first cavity 7 is changed, the air pressure in the second cavity 11 is also changed simultaneously, allowing the buffer valve core 10 to move using the air pressure difference in the second cavity 11.

[0049] like Figure 3 , Figure 4 As shown, the pilot valve core 13 is slidably disposed in the valve body 1 and is used to open or close the communication channel; when the pilot valve core 13 closes the communication channel, the first cavity 7 is connected to the outside through the external drain port 8; when the pilot valve core 13 opens the communication channel, the pilot valve core 13 closes the external drain port 8.

[0050] Specifically, such as Figure 1 , Figure 2As shown, in normal operation, the pilot valve core 13 keeps the communication channel open. Both the first cavity 7 and the second cavity 11 are connected to the inlet section 2 of the medium channel and are closed to the outside. At this time, the air pressure in the first cavity 7, the second cavity 11, and the inlet section 2 remains consistent. The main valve core 4, under the action of the first driving device 9, keeps the medium channel closed, and the buffer valve core 10, under the action of the second driving device 12, keeps the buffer channel closed. This pilot valve, which integrates a buffer function, remains normally closed.

[0051] A third driving device 14 is connected to the valve body 1. The driving end of the third driving device 14 is connected to the pilot valve core 13. The third driving device 14 is used to drive the pilot valve core 13 to slide, so as to open or close the communication channel.

[0052] like Figure 3 , Figure 4 As shown, when the pilot valve with integrated buffer function needs to be opened, the pilot valve core 13 slides to close the communication channel under the action of the third driving device 14, so that the first cavity 7 and the second cavity 11 are isolated from the inlet section cavity 2 of the medium channel and connected to the outside. At this time, the air pressure in the first cavity 7 and the second cavity 11 gradually decreases from the air pressure in the inlet section cavity 2. Under the action of this pressure difference, the buffer valve core 10 overcomes the force of the second driving device 12 and slowly opens the buffer channel, allowing the working medium in the inlet section cavity 2 to slowly enter the outlet section cavity 3 through the buffer channel.

[0053] like Figure 5 , Figure 6 As shown, as the air pressure in the outlet section 3 gradually approaches the air pressure in the inlet section 2, the force provided by the working medium in the outlet section 3, which pushes the main valve core 4 towards the opening direction, gradually overcomes the force of the first driving device 9, thereby causing the main valve core 4 to gradually open the medium channel. Furthermore, due to the configuration of the buffer valve core 10 and the buffer channel, a buffering function is achieved, avoiding the problem of pressure peaks easily generated when directly opening the medium channel.

[0054] When the pilot valve with integrated buffer function needs to be closed, the pilot valve core 13 slides open the communication channel under the action of the third driving device 14, so that the first cavity 7 and the second cavity 11 are both connected to the inlet section cavity 2 of the medium channel and are isolated and sealed from the outside. At this time, the air pressure in the first cavity 7, the second cavity 11 and the inlet section cavity 2 returns to the same level, the main valve core 4 closes the medium channel under the action of the first driving device 9, and the buffer valve core 10 closes the buffer channel under the action of the second driving device 12, thereby closing the pilot valve with integrated buffer function and maintaining this closed and sealed state continuously in a high-pressure environment.

[0055] like Figure 2 As shown, in the pilot valve with integrated buffer function provided in this embodiment, the main valve core 4 has a first pressure surface 15 that can contact the medium in the outlet section cavity 3 of the medium channel. When the medium in the outlet section cavity 3 contacts the first pressure surface 15, it can provide a first force to move the main valve core 4 toward the opening direction.

[0056] like Figure 2 As shown, the main valve core 4 has a second pressure surface 16 that can contact the medium in the inlet section cavity 2 of the medium channel. When the medium in the inlet section cavity 2 contacts the second pressure surface 16, it can provide a second force to move the main valve core 4 toward the closing direction.

[0057] The projected area of ​​the first pressure surface 15 in the moving direction of the main valve core 4 is S1, and the projected area of ​​the second pressure surface 16 in the moving direction of the main valve core 4 is S2, where S1 > S2. With this configuration, when the medium pressure in the outlet section cavity 3 gradually balances with the medium pressure in the inlet section cavity 2, because the area of ​​the first pressure surface 15 is larger than the area of ​​the second pressure surface 16, the thrust of the medium in the outlet section cavity 3 on the main valve core 4 in the opening direction is greater than the thrust of the medium in the inlet section cavity 2 on the main valve core 4 in the closing direction, thus allowing the main valve core 4 to open smoothly. Of course, the above description is not limiting. In some alternative embodiments, the areas of the first pressure surface 15 and the second pressure surface 16 can be equal or the opposite of the above. The opening of the main valve core 4 mainly relies on the pressure difference between the outlet section cavity 3 and the first cavity 7 behind the main valve core 4. The above configuration makes the opening process of the main valve core 4 smoother.

[0058] like Figure 2In the pilot valve with integrated buffer function provided in this embodiment, the main valve core 4 has a third pressure surface 17 that can contact the medium in the inlet section cavity 2 of the medium channel. When the medium in the inlet section cavity 2 contacts the third pressure surface 17, it can provide a third force to move the main valve core 4 in the opening direction. With this setting, when the main valve core 4 is closed, the third pressure surface 17 provides a force to open the main valve core 4, and this third force offsets part of the second force on the second pressure surface 16, thereby making the main valve core 4 open more smoothly. Of course, the above description is not limiting, and in some alternative embodiments, the third pressure surface 17 can be omitted.

[0059] like Figure 2 As shown, in the pilot valve with integrated buffering function provided in this embodiment, a throttle nozzle 18 is detachably provided in the buffer medium outlet section 6. With this configuration, the buffering time can be adjusted and the buffering effect improved by replacing the throttle nozzle 18 as needed during use. Of course, the above description is not limiting; in some alternative embodiments, the throttle nozzle 18 can be integrally formed within the buffer medium outlet section 6.

[0060] like Figure 2 As shown, in the pilot valve with integrated buffering function provided in this embodiment, the buffer medium inlet section 5 is composed of multiple small-hole channels, the diameter of which is smaller than the orifice diameter of the throttle nozzle 18. With this configuration, when the working medium passes through the buffer channel, even if excess material in the working medium partially blocks the small holes at the buffer medium inlet end, it will not affect the passage of the working medium within the buffer channel, and can effectively prevent excess material from clogging the throttle nozzle 18, ensuring system safety. Of course, the above description is not limiting; in some alternative embodiments, the buffer medium inlet section 5 may only have one through-hole, or a filter device may be installed on the buffer channel.

[0061] In the pilot valve with integrated buffer function provided in this embodiment, the buffer valve core 10 is made of polyetheretherketone (PEEK). This design gives the buffer valve core 10 advantages such as heat resistance, wear resistance, shock resistance, fatigue resistance, and high mechanical strength, and it also has a self-lubricating function. Of course, the above description is not limiting; in some alternative embodiments, the buffer valve core 10 can also be made of other conventional materials, such as metal.

[0062] like Figure 2As shown, in the pilot valve with integrated buffer function provided in this embodiment, the buffer valve core 10 has a fourth pressure surface 19 that can contact the medium in the buffer channel. When the medium in the buffer channel contacts the fourth pressure surface 19, it can provide a fourth force to move the buffer valve core 10 in the opening direction. The fourth pressure surface 19 can partially offset the closing force of the second drive device 12 on the buffer valve core 10, making the opening of the buffer valve core 10 smoother. The opening of the buffer valve core 10 mainly relies on the pressure difference between the inlet section cavity 2 and the second cavity 11 behind the buffer valve core 10. The above-mentioned arrangement makes the opening process of the buffer valve core 10 smoother.

[0063] like Figure 2 As shown, in the pilot valve with integrated buffer function provided in this embodiment, the first driving device 9 is a first elastic element. The first elastic element has an elastic force that drives the main valve core 4 to move in the direction of closing the medium channel. By setting the first elastic element, the main valve core 4 can be kept in a normally closed state. Specifically, the first elastic element can be a spring. Of course, the above description is not limiting. In some alternative embodiments, the first driving device 9 can also be other power devices, such as cylinders, hydraulic cylinders, electric push rods, etc.

[0064] like Figure 2 As shown, in the pilot valve with integrated buffer function provided in this embodiment, the second driving device 12 is a second elastic element, which has an elastic force that drives the buffer valve core 10 to move in the closing direction. By providing the second elastic element, the buffer valve core 10 can be kept in a normally closed state. Specifically, the second elastic element can be a spring. Of course, the above description is not limiting; in some alternative embodiments, the second driving device 12 can also be other power devices, such as cylinders, hydraulic cylinders, electric actuators, etc.

[0065] like Figure 1 As shown, in the pilot valve with integrated buffer function provided in this embodiment, the third driving device 14 includes an electromagnetic drive. This electromagnetic drive enables remote control of the pilot valve core 13. Of course, the above description is not limiting; in some alternative embodiments, the third driving device 14 can also employ other power devices, such as cylinders, hydraulic cylinders, electric actuators, etc.

[0066] like Figure 2As shown, in the pilot valve with integrated buffer function provided in this embodiment, a third elastic element 20 is also connected to the pilot valve core 13. The third elastic element 20 has an elastic force that drives the pilot valve core 13 toward opening the communication channel; specifically, the third elastic element 20 can be a spring. By providing the third elastic element 20, the pilot valve core 13 can be kept normally open to the communication channel in a free state. Of course, the above description is not limiting. In some alternative embodiments, the third elastic element 20 can be omitted. For example, an electromagnetic drive unit can be always energized to maintain the normally open state of the communication channel.

[0067] Working principle:

[0068] The pilot valve provided in this embodiment integrates a buffer function. Under normal conditions, such as Figure 1 , Figure 2 As shown, the pilot valve core 13 keeps the communication channel open. Specifically, there is a gap h1 between the end of the pilot valve core 13 facing the communication channel and the communication channel, allowing the working medium to pass through the gap h1. This ensures that both the first cavity 7 and the second cavity 11 are in communication with the inlet section cavity 2 of the medium channel and are closed to the outside. At this time, the air pressure in the first cavity 7, the second cavity 11, and the inlet section cavity 2 is consistent. The main valve core 4 remains closed to the medium channel under the action of the first driving device 9, and the buffer valve core 10 remains closed to the buffer channel under the action of the second driving device 12. The pilot valve with integrated buffer function remains normally closed.

[0069] When it is necessary to open the pilot valve that integrates a buffer function, such as Figure 2 , Figure 3 As shown, the pilot valve core 13 slides to close the communication channel under the action of the third driving device 14. Specifically, the pilot valve core 13 moves downward, thereby closing the communication channel at the end of the pilot valve core 13 closest to it, and opening the same gap h1 at the upper end of the pilot valve core 13 to the external outlet 8, so that the first cavity 7 and the second cavity 11 are isolated from the inlet section cavity 2 of the medium channel, and are connected to the outside. At this time, the air pressure in the first cavity 7 and the second cavity 11 gradually decreases from the air pressure in the inlet section cavity 2. Under the action of this pressure difference, the buffer valve core 10 overcomes the force of the second driving device 12 and slowly opens the buffer channel, allowing the working medium in the inlet section cavity 2 to slowly enter the outlet section cavity 3 through the buffer channel.

[0070] like Figure 4 , Figure 5As shown, as the air pressure in the outlet section 3 gradually approaches the air pressure in the inlet section 2, the force provided by the working medium in the outlet section 3, which pushes the main valve core 4 towards the opening direction, gradually overcomes the force of the first driving device 9, thereby causing the main valve core 4 to gradually open the medium channel. Furthermore, due to the configuration of the buffer valve core 10 and the buffer channel, a buffering function is achieved, avoiding the problem of pressure peaks easily generated when directly opening the medium channel.

[0071] When the pilot valve with integrated buffer function needs to be closed, the pilot valve core 13 slides open the communication channel under the action of the third driving device 14, so that the first cavity 7 and the second cavity 11 are both connected to the inlet section cavity 2 of the medium channel and are isolated and sealed from the outside. At this time, the air pressure in the first cavity 7, the second cavity 11 and the inlet section cavity 2 returns to the same level, the main valve core 4 closes the medium channel under the action of the first driving device 9, and the buffer valve core 10 closes the buffer channel under the action of the second driving device 12, thereby closing the pilot valve with integrated buffer function and maintaining this closed and sealed state continuously in a high-pressure environment.

[0072] This embodiment also provides a liquid rocket engine, including a propellant tank and a thrust chamber. Propellant in the propellant tank enters the thrust chamber via a delivery pipe. The delivery pipe is connected to a pilot valve with integrated buffering function as described in the above embodiments. When the pilot valve is opened, it is used to deliver the medium from the propellant tank to the thrust chamber.

[0073] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A pilot valve with integrated buffer function, characterized in that, include: The valve body (1) has a medium channel inside, the medium channel having an inlet section cavity (2) near the inlet and an outlet section cavity (3) near the outlet; The main valve core (4) is slidably disposed in the valve body (1) for opening or closing the medium channel; the main valve core (4) has a buffer channel, which has a buffer medium inlet section (5) near the inlet and a buffer medium outlet section (6) near the outlet. When the main valve core (4) is closed, the medium channel can be opened through the buffer channel. The valve body (1) has a first sliding channel for sliding the main valve core (4). The first sliding channel forms a first cavity (7) at the tail of the main valve core (4). The first cavity (7) is connected to the inlet section cavity (2) of the medium channel through a connecting channel. The first cavity (7) is also connected to the outside through an external outlet (8). The first driving device (9) is connected to the main valve core (4) and is used to drive the main valve core (4) to slide in the direction of closing the medium channel; A buffer valve core (10) is slidably disposed within the main valve core (4) for opening or closing the buffer channel; the main valve core (4) has a second sliding channel for sliding the buffer valve core (10), the second sliding channel forming a second cavity (11) at the tail of the buffer valve core (10), the second cavity (11) communicating with the first cavity (7); The second driving device (12) is connected to the buffer valve core (10) and is used to drive the buffer valve core (10) to slide in the direction of closing the buffer channel; The pilot valve core (13) is slidably disposed in the valve body (1) for opening or closing the communication channel; when the communication channel is closed, the first cavity (7) is connected to the outside through the external drain (8); when the communication channel is opened, the pilot valve core (13) closes the external drain (8). The third driving device (14) is connected to the pilot valve core (13) and is used to drive the pilot valve core (13) to slide.

2. The pilot valve with integrated buffer function according to claim 1, characterized in that, The main valve core (4) has a first pressure surface (15) that can contact the medium in the outlet section cavity (3) of the medium channel. When the medium in the outlet section cavity (3) contacts the first pressure surface (15), it can provide a first force to move the main valve core (4) in the opening direction. The main valve core (4) has a second pressure surface (16) that can contact the medium in the inlet section cavity (2) of the medium channel. When the medium in the inlet section cavity (2) contacts the second pressure surface (16), it can provide a second force to move the main valve core (4) toward the closing direction. The first pressure surface (15) has a projected area of ​​S1 in the moving direction of the main valve core (4), and the second pressure surface (16) has a projected area of ​​S2 in the moving direction of the main valve core (4), wherein S1 > S2.

3. The pilot valve with integrated buffer function according to claim 2, characterized in that, The main valve core (4) has a third pressure surface (17) that can contact the medium in the inlet section cavity (2) of the medium channel. When the medium in the inlet section cavity (2) contacts the third pressure surface (17), it can provide a third force to move the main valve core (4) in the opening direction.

4. The pilot valve with integrated buffer function according to claim 1, characterized in that, The buffer medium outlet section (6) is detachably equipped with a throttle nozzle (18).

5. The pilot valve with integrated buffer function according to claim 4, characterized in that, The buffer medium inlet section (5) is composed of multiple small holes, the diameter of which is smaller than the orifice diameter of the throttle nozzle (18).

6. The pilot valve with integrated buffer function according to any one of claims 1-5, characterized in that, The buffer valve core (10) is made of polyetheretherketone material.

7. The pilot valve with integrated buffer function according to any one of claims 1-5, characterized in that, The buffer valve core (10) has a fourth pressure surface (19) that can contact the medium in the buffer channel. When the medium in the buffer channel contacts the fourth pressure surface (19), it can provide a fourth force to move the buffer valve core (10) in the opening direction.

8. The pilot valve with integrated buffer function according to any one of claims 1-5, characterized in that, The first driving device (9) is a first elastic element, which has an elastic force that drives the main valve core (4) to move in the direction of closing the medium channel.

9. The pilot valve with integrated buffer function according to any one of claims 1-5, characterized in that, The second driving device (12) is a second elastic element, which has an elastic force that drives the buffer valve core (10) to move in the closing direction.

10. The pilot valve with integrated buffer function according to any one of claims 1-5, characterized in that, The third driving device (14) includes an electromagnetic driving element.

11. A liquid rocket engine, characterized in that, include: The tank and the thrust chamber, wherein the propellant in the tank enters the thrust chamber through a delivery pipe, and the delivery pipe is connected to a pilot valve with integrated buffer function as described in any one of claims 1-10.

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