Isolation valve and fuel supply system of rocket engine

Abstract

The invention relates to the technical field of valves, and provides an isolating valve and a fuel supply system of a rocket engine, the isolating valve comprises a valve body, a valve core and an elastic piece, the valve body is internally provided with a first cavity, a second cavity and a third cavity, and the valve body is provided with a first interface, a second interface and a third interface; the valve element can slide in a reciprocating mode, the end face of the valve element faces the first cavity, and the valve element is provided with a first sealing part and a second sealing part. The elastic piece enables the valve element to have the tendency of sliding in the direction close to the first cavity. The valve element slides between a cut-off position and a conduction position under the action of media in the first cavity and the second cavity and the elastic piece, in the cut-off position, the first sealing part isolates the first cavity from the second cavity, the second sealing part isolates the second cavity from the third cavity, and in the conduction position, the three cavities are communicated. Therefore, the acting force of the elastic piece is overcome by the pressure of the fuel, so that the three cavities can be communicated, the two fuel storage tanks can supply materials to the engine simultaneously, and external driving force is not needed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an isolation valve and a fuel supply system of a rocket engine. BACKGROUND

[0002] The fuel supply system of an engine is a key part to ensure that the engine can operate efficiently and stably, which is responsible for delivering the right amount of fuel to the engine at the right time and in the right form. The fuel supply system of an engine includes two fuel tanks, and the fuel outlets of the two fuel tanks are connected to the engine. Fuel is stored in the fuel tanks, and a valve needs to be arranged between the two fuel tanks and the engine. Before the engine starts to work, the valve is used to close the fuel in the fuel tanks. When the engine starts to work, the valve is opened to ensure that the fuel in the two fuel tanks is supplied to the combustion chamber of the engine at the same time.

[0003] In the related art, a metal diaphragm is used to close the valve, and when the engine starts, the diaphragm is broken by the pressure of the fuel tank to open the valve. For the fuel supply system of an engine with two fuel tanks, a diaphragm valve is arranged at the outlet of each fuel tank. Since the burst pressure of the diaphragm of the diaphragm valve has a fluctuation range, it cannot be guaranteed that the diaphragms of all diaphragm valves will break at the same time. When the diaphragm of one diaphragm valve breaks first, the fuel in the fuel tank corresponding to the diaphragm valve will quickly fill the downstream of the other diaphragm valve before the diaphragm of the other diaphragm valve breaks, so that the diaphragm of the other diaphragm valve cannot break normally, and the fuel in the other fuel tank cannot flow out. If a cutter is used to cut the diaphragm, a cutter and a driving mechanism for driving the cutter to act need to be arranged, which is complex in structure and cannot guarantee the reliability.

[0004] Therefore, how to make two fuel tanks supply fuel to the engine at the same time without relying on external driving force is an important topic to be solved in the industry at present. SUMMARY

[0005] The present application provides an isolation valve and a fuel supply system of a rocket engine to make two fuel tanks supply fuel to the engine at the same time without relying on external driving force.

[0006] The present application provides an isolation valve, comprising: a valve body, which has a first chamber, a second chamber and a third chamber distributed in sequence along a reference direction in the inside of the valve body, and the valve body is provided with a first interface in communication with the first chamber, a second interface in communication with the second chamber and a third interface in communication with the third chamber; a valve core, which is arranged in the inside of the valve body to reciprocally slide along the reference direction, and an end surface of the valve core faces the first chamber, and the valve core has a first sealing part and a second sealing part; a resilient member adapted to cause the spool to have a tendency to slide in a direction close to the first chamber; wherein the spool is adapted to slide between a closed position and an open position under the action of the medium in the first chamber, the medium in the second chamber and the resilient member, in the closed position, the first sealing part separates the first chamber from the second chamber, and the second sealing part separates the second chamber from the third chamber, in the open position, the first chamber communicates with the second chamber, and the second chamber communicates with the third chamber.

[0007] According to the isolation valve provided by the present application, a first sealing torus is formed between the first chamber and the second chamber, and the projection area of the first chamber is located within the projection area of the first sealing torus along the reference direction, and the circumferential side surface of the first sealing part is adapted to the first sealing torus; a second sealing torus is formed between the second chamber and the third chamber, and the circumferential side surface of the second sealing part is adapted to the second sealing torus; The isolation valve further comprises: a first sealing member arranged between the first sealing part and the first sealing torus; a second sealing member arranged between the second sealing part and the second sealing torus.

[0008] According to the isolation valve provided by the present application, the projection area of the first sealing part is located within the projection area of the second chamber along the reference direction, and the length dimension of the first sealing part is smaller than the length dimension of the second chamber; An annular groove is formed between the first sealing part and the second sealing part, and the length dimension of the annular groove is at least greater than the length dimension of the first sealing torus along the reference direction.

[0009] According to the isolation valve provided by the present application, the valve body further has a fourth chamber, and the fourth chamber is located on the side of the third chamber away from the second chamber; The spool further has a supporting part, and the supporting part is located on the side of the second sealing part away from the first sealing part, the circumferential side surface of the supporting part is adapted to the inner wall of the fourth chamber, the resilient member is arranged in the fourth chamber, and the valve body is provided with a vent hole communicating with the fourth chamber; The isolation valve further comprises: a third sealing member arranged between the supporting part and the inner wall of the fourth chamber.

[0010] According to the isolation valve provided by the present application, the projection area of the circumferential side surface of the second sealing part is located within the projection area of the circumferential side surface of the supporting part along the reference direction. When the valve core is in the closed position, the support part is located on the side of the second sealing torus away from the first sealing torus, and a gap is formed between the end face of the support part facing the second chamber and the inner wall of the valve body, forming an annular action chamber, which is in communication with the third chamber.

[0011] According to the isolation valve provided by the application, in the reference direction, the projection area of the first sealing torus coincides with the projection area of the second sealing torus, the area of the support part corresponding to the action chamber is a first area, and the cross-sectional area of the first sealing part is a second area, and the first area is equal to the second area.

[0012] According to the isolation valve provided by the application, the cross section of the support part is circular, the diameter of the support part is D2, the cross section of the first sealing part is circular, the diameter of the first sealing part is D1, and the relationship between the diameter of the support part and the diameter of the first sealing part is 2×D1×D1=D2×D2.

[0013] According to the isolation valve provided by the application, the cross-sectional area of the first interface is equal to the cross-sectional area of the second interface.

[0014] The application further provides a fuel supply system of a rocket engine, comprising: two fuel tanks for storing fuel; a first isolation valve, which is the isolation valve as described above, the first interface of the first isolation valve and the second interface of the first isolation valve are respectively connected to the fuel outlets of the two fuel tanks, and the third interface of the first isolation valve is adapted to be connected to the fuel inlet of the engine.

[0015] According to the fuel supply system of the rocket engine provided by the application, the fuel tank has a fuel chamber and a pressurizing chamber, the fuel chamber and the pressurizing chamber are separated by a diaphragm, and the fuel supply system of the rocket engine further comprises: a second isolation valve, which has the same structure as the first isolation valve, the first interface of the second isolation valve and the second interface of the second isolation valve are respectively connected to the pressurizing chambers of the two fuel tanks; a gas supply device, the gas supply end of which is connected to the third interface of the second isolation valve.

[0016] The isolation valve provided by the application comprises a valve body, a valve core and an elastic member. The valve body has a first chamber, a second chamber and a third chamber in the interior, which are sequentially distributed along a reference direction. The valve body is provided with a first interface, a second interface and a third interface, the first interface communicates with the first chamber, the second interface communicates with the second chamber, and the third interface communicates with the third chamber. The valve core is arranged in the interior of the valve body and can reciprocate along the reference direction. The end surface of the valve core faces the first chamber, and the medium in the first chamber can generate an acting force on the valve core in the direction away from the first chamber. The elastic member can make the valve core have a tendency to slide in the direction close to the first chamber. The valve core can slide between a cut-off position and a conduction position under the action of the medium pressure in the first chamber, the medium pressure in the second chamber and the elastic member. The valve core has a first sealing part and a second sealing part, when the valve core slides to the cut-off position, the first sealing part isolates the first chamber from the second chamber, and the second sealing part isolates the second chamber from the third chamber, at this time, the first interface, the second interface and the third interface do not communicate with each other. When the valve core slides to the conduction position, the first chamber communicates with the second chamber, and the second chamber communicates with the third chamber, at this time, the first interface and the second interface both communicate with the third interface. When the isolation valve provided by the application is applied to the fuel supply system of an engine with two fuel tanks, the first interface and the second interface of the isolation valve can be connected to the fuel tanks respectively, and the third interface of the isolation valve can be connected to the combustion chamber of the engine. When the pressure in the two fuel tanks reaches a certain value, and the sum of the acting force of the fuel in the first chamber on the valve core and the acting force of the fuel in the second chamber on the valve core is greater than the acting force of the elastic member on the valve core, the valve core will slide to the conduction position, so that the first chamber communicates with the second chamber, and the second chamber communicates with the third chamber, at this time, the fuel in the two fuel tanks can flow to the third chamber at the same time, and then flow to the combustion chamber of the engine, realizing that the two fuel tanks supply fuel to the engine at the same time, and the process does not need to rely on external driving force to control the isolation valve.

[0017] Further, in the fuel supply system of the rocket engine provided by the application, since the isolation valve is provided, the various advantages as described above are also provided. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0019] Figure 1 It is a structure schematic view of the isolation valve provided by the application when the valve core is in the cut-off position.

[0020] Figure 2 This is a schematic diagram of the isolation valve provided by the present invention when the valve core is in the conducting position.

[0021] Figure 3 This is a cross-sectional view of the valve body provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the fuel supply system for a rocket engine provided by the present invention.

[0023] Figure label: 1. Valve body; 2. First chamber; 3. Second chamber; 4. Third chamber; 5. First interface; 6. Second interface; 7. Third interface; 8. First sealing part; 9. Second sealing part; 10. Elastic element; 11. First sealing ring surface; 12. Second sealing ring surface; 13. First sealing element; 14. Second sealing element; 15. Annular groove; 16. Fourth chamber; 17. Support part; 18. Vent hole; 19. Third sealing element; 20. Fuel tank; 21. Fuel chamber; 22. Pressurization chamber; 23. Diaphragm; 24. Air supply device; 25. Engine; 26. First isolation valve; 27. Second isolation valve; 28. Working chamber. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] The following is combined with Figures 1 to 4 The isolation valve of the present invention is described.

[0026] like Figures 1 to 4 As shown, the isolation valve provided in this embodiment of the invention includes a valve body 1, a valve core, and an elastic element 10.

[0027] Specifically, the valve body 1 has a first chamber 2, a second chamber 3, and a third chamber 4, which are distributed sequentially along a reference direction. The reference direction is referenced to... Figure 1 The direction indicated by m.

[0028] The valve body 1 is provided with a first interface 5, a second interface 6 and a third interface 7. The first interface 5 is connected to the first chamber 2, the second interface 6 is connected to the second chamber 3, and the third interface 7 is connected to the third chamber 4.

[0029] The valve core is arranged inside the valve body 1 and can slide back and forth along the reference direction.

[0030] The end surface of the valve core faces the first chamber 2, and the medium in the first chamber 2 can generate an acting force on the valve core in a direction away from the first chamber 2. The elastic member 10 can make the valve core have a tendency to slide in a direction close to the first chamber 2.

[0031] The direction of the acting force of the medium in the second chamber 3 on the valve core depends on the structure of the valve core at the position corresponding to the second chamber 3. For example, the projection area of the two opposite side walls of the valve core corresponding to the second chamber 3 along the reference direction, with reference to Figure 1 , the projection area of the side wall of the valve core on the left side of the second chamber 3 along the reference direction is a third area, and the projection area of the side wall of the valve core on the right side of the second chamber 3 along the reference direction is a fourth area. If the third area is greater than the fourth area, the acting force of the medium in the second chamber 3 on the valve core is to the left along the reference direction; if the third area is less than the fourth area, the acting force of the medium in the second chamber 3 on the valve core is to the right along the reference direction.

[0032] The valve core can slide between the closed position and the open position under the action of the medium pressure in the first chamber 2, the medium pressure in the second chamber 3, and the elastic member 10.

[0033] The valve core has a first sealing part 8 and a second sealing part 9. The acting force of the medium in the second chamber 3 on the valve core includes the acting force of the medium in the second chamber 3 on the first sealing part 8 of the valve core and the acting force of the medium in the second chamber 3 on the second sealing part 9 of the valve core. The direction of the acting force of the medium in the second chamber 3 on the valve core depends on the magnitude of the acting force of the medium in the second chamber 3 on the first sealing part 8 of the valve core and the magnitude of the acting force of the medium in the second chamber 3 on the second sealing part 9 of the valve core.

[0034] When the valve core slides to the closed position, the first sealing part 8 isolates the first chamber 2 from the second chamber 3, and the second sealing part 9 isolates the second chamber 3 from the third chamber 4, at this time, the first interface 5, the second interface 6 and the third interface 7 are not communicated with each other.

[0035] When the valve core slides to the open position, the first chamber 2 is communicated with the second chamber 3, and the second chamber 3 is communicated with the third chamber 4, at this time, the first interface 5 and the second interface 6 are both communicated with the third interface 7.

[0036] With this configuration, when the isolation valve provided in this embodiment of the invention is applied to the fuel supply system of an engine with two fuel tanks 20, the first port 5 and the second port 6 of the isolation valve can be connected to the fuel tanks 20 respectively, and the third port 7 of the isolation valve can be connected to the combustion chamber of the engine 25. When the pressure in the two fuel tanks 20 reaches a certain value, when the sum of the force exerted by the fuel in the first chamber 2 on the valve core and the force exerted by the fuel in the second chamber 3 on the valve core is greater than the force exerted by the elastic element 10 on the valve core, the valve core will slide to the conduction position, so that the first chamber 2 is connected to the second chamber 3, and the second chamber 3 is connected to the third chamber 4. At this time, the fuel in the two fuel tanks 20 can flow into the third chamber 4 at the same time, and then flow into the combustion chamber of the engine 25, realizing that the two fuel tanks 20 simultaneously supply fuel to the engine 25, and this process does not require external driving force to operate the isolation valve.

[0037] In this embodiment of the invention, a first sealing annular surface 11 is formed between the first chamber 2 and the second chamber 3. Along a reference direction, the projection area of ​​the first chamber 2 lies within the projection area of ​​the first sealing annular surface 11. The circumferential side of the first sealing portion 8 is adapted to the first sealing annular surface 11. In this case, the isolation valve further includes a first sealing element 13, which is disposed between the first sealing portion 8 and the first sealing annular surface 11 to ensure a sliding seal between the first sealing portion 8 and the first sealing annular surface 11.

[0038] A second sealing annular surface 12 is formed between the second chamber 3 and the third chamber 4, and the circumferential side surface of the second sealing portion 9 is adapted to the second sealing annular surface 12. At this time, the isolation valve also includes a second sealing element 14, which is disposed between the second sealing portion 9 and the second sealing annular surface 12 to ensure a sliding seal between the second sealing portion 9 and the second sealing annular surface 12.

[0039] In a specific embodiment, the first sealing element 13 and the second sealing element 14 may be, but are not limited to, sealing rings. An annular groove is provided on the circumferential side of the first sealing portion 8, and the first sealing element 13 is fitted into the annular groove of the first sealing portion 8. An annular groove is provided on the circumferential side of the second sealing portion 9, and the second sealing element 14 is fitted into the annular groove of the second sealing portion 9.

[0040] In this embodiment, along the reference direction, the length of the first sealing part 8 is smaller than the length of the second chamber 3. The valve core can slide until the first sealing part 8 is completely located within the second chamber 3, ensuring that the end face of the first sealing part 8 near the first chamber 2 and the end face of the first sealing part 8 near the third chamber 4 are both disengaged from the inner wall of the valve body 1. There is a gap between the end face of the first sealing part 8 near the first chamber 2 and the valve body 1, and there is a gap between the end face of the first sealing part 8 near the third chamber 4 and the inner wall of the valve body 1.

[0041] Meanwhile, along the reference direction, the projection area of the first sealing part 8 is located within the projection area of the second chamber 3. That is, the cross-sectional area of the first sealing part 8 is smaller than the cross-sectional area of the second chamber 3. When the valve core slides to the first sealing part 8 completely located in the second chamber 3, there is a gap between the circumferential side surface of the first sealing part 8 and the inner wall of the second chamber 3.

[0042] In combination with the gap between the end surface of the first sealing part 8 close to the first chamber 2 and the inner wall of the valve body 1, the gap between the end surface of the first sealing part 8 close to the third chamber 4 and the inner wall of the valve body 1, and the gap between the circumferential side surface of the first sealing part 8 and the inner wall of the second chamber 3, the first chamber 2 and the second chamber 3 are connected.

[0043] An annular groove 15 is formed between the first sealing part 8 and the second sealing part 9. Along the reference direction, the length dimension of the annular groove 15 is greater than the length dimension of the first sealing ring surface 11. When the valve core is in the open position, the first sealing part 8 is completely located in the second chamber 3, while the second sealing ring surface 12 is located between the first sealing part 8 and the second sealing part 9, that is, a part of the annular groove 15 is located in the second chamber 3, and another part of the annular groove 15 is located in the third chamber 4. The second sealing ring surface 12 is matched with the circumferential side surface of the second sealing part 9, so that there is a gap between the second sealing ring surface 12 and the bottom wall of the annular groove 15.

[0044] Therefore, when the valve core is in the open position, referring to Figure 2 , the second chamber 3 is connected with the annular groove 15, the third chamber 4 is also connected with the annular groove 15, and there is a gap between the second sealing ring surface 12 and the bottom wall of the annular groove 15, so that the second chamber 3 and the third chamber 4 are connected.

[0045] In the embodiment of the present application, the valve body 1 further has a fourth chamber 16, and the fourth chamber 16 is located on the side of the third chamber 4 away from the second chamber 3.

[0046] The valve core further has a supporting part 17, and the supporting part 17 is located on the side of the second sealing part 9 away from the first sealing part 8. The supporting part 17 is located in the fourth chamber 16, and the circumferential side surface of the supporting part 17 is matched with the inner wall of the fourth chamber 16, so that the supporting part 17 and the fourth chamber 16 are in sliding fit.

[0047] At this time, the isolation valve further comprises a third sealing member 19, and the third sealing member 19 is arranged between the supporting part 17 and the inner wall of the fourth chamber 16, for ensuring the sliding sealing between the supporting part 17 and the inner wall of the fourth chamber 16.

[0048] In specific embodiments, the third sealing member 19 can be but is not limited to a sealing ring.

[0049] The support part 17 is provided with an annular groove on the circumferential side, and the third sealing part 19 is embedded in the annular groove of the support part 17.

[0050] The third sealing part 19 is provided with at least two, and each third sealing part 19 is distributed along the reference direction.

[0051] The elastic part 10 is arranged in the fourth chamber 16, and the elastic part 10 can be but is not limited to a threaded compression spring. One end of the threaded compression spring abuts against the support part 17, and the other end of the threaded compression spring abuts against the valve body 1. Specifically, a limiting blind hole can be arranged at one end of the support part 17 facing the fourth chamber 16, so that the threaded compression spring extends into the limiting blind hole, and the end of the threaded compression spring abuts against the bottom wall of the limiting blind hole. The arrangement of the limiting blind hole can guide the compression and release process of the threaded compression spring, and avoid lateral bending deformation of the threaded compression spring.

[0052] The valve body 1 is provided with a vent hole 18, and the vent hole 18 communicates with the fourth chamber 16. Specifically, the vent hole 18 can be arranged on the end face of the valve body 1. The vent hole 18 communicates the fourth chamber 16 with the external space of the valve body 1, and when the valve core slides to the open position, the gas in the fourth chamber 16 can be discharged, so that the valve core can slide smoothly. When the valve core slides to the closed position, the gas outside the valve body 1 enters the fourth chamber 16, so that the gas pressure in the fourth chamber 16 is stable.

[0053] In the embodiment of the application, along the reference direction, the projection area of the circumferential side of the second sealing part 9 is located in the projection area of the circumferential side of the support part 17. That is to say, the cross-sectional area of the support part 17 is greater than the cross-sectional area of the second sealing part 9, and the support part 17 and the second sealing part 9 form a stepped structure.

[0054] When the valve core is in the closed position, the support part 17 is located on the side of the second sealing ring surface 12 away from the first sealing ring surface 11, and the end face of the support part 17 facing the second chamber 3 has a gap with the inner wall of the valve body 1. The gap position forms an annular action cavity 28, and the annular action cavity 28 communicates with the third chamber 4, and the medium in the third chamber 4 can flow into the annular action cavity 28.

[0055] In this way, when the pressures of the first chamber 2 and the second chamber 3 are relatively small and the pressure of the third chamber 4 is relatively large, the medium in the action chamber 28 connected with the third chamber 4 has a relatively large pressure, and the medium in the action chamber 28 can generate an action force on the support 17 and the valve body 1 in a direction away from each other, and when the position of the valve body 1 is fixed, the medium in the action chamber 28 can generate an action force on the support 17 in a direction away from the first chamber 2, and when the pressure of the third chamber 4 reaches a certain value, which is sufficient to overcome the friction between the valve core and the valve body 1 and the action force of the elastic member 10 on the valve core, the valve core can slide to the open position.

[0056] It can be understood that the formation of the annular action chamber 28 enables the isolation valve to be used reversely. That is, the isolation valve can be used as a combined valve when the first interface 5 and the second interface 6 are used as inlets and the third interface 7 is used as an outlet, and the isolation valve can be used as a divided valve when the third interface 7 is used as an inlet and the first interface 5 and the second interface 6 are used as outlets.

[0057] When the isolation valve is applied to the fuel supply system of a rocket engine, the fuel supply system of the rocket engine includes two fuel tanks 20, two isolation valves and a gas supply device 24, one of the isolation valves is referred to as a first isolation valve 26 and used as a divided valve, and the other isolation valve is referred to as a second isolation valve 27 and used as a combined valve.

[0058] The fuel tank 20 has a fuel chamber 21 and a pressurized chamber 22, and the fuel chamber 21 and the pressurized chamber 22 are separated by a diaphragm 23. By increasing the pressure of the pressurized chamber 22, the pressure of the fuel chamber 21 can be increased.

[0059] The gas supply end of the gas supply device 24 is connected with the third interface 7 of the first isolation valve 26, the first interface 5 and the second interface 6 of the first isolation valve 26 are respectively connected with the pressurized chambers 22 of the two fuel tanks 20. The fuel chambers 21 of the two fuel tanks 20 are respectively connected with the first interface 5 and the second interface 6 of the second isolation valve 27, and the third interface 7 of the second isolation valve 27 is used to connect the combustion chamber of the engine 25.

[0060] In a further embodiment, the projection area of the first sealing ring surface 11 coincides with the projection area of the second sealing ring surface 12 in the reference direction. Correspondingly, the projection area of the first sealing part 8 coincides with the projection area of the second sealing part 9 in the reference direction, that is, the cross-sectional area of the first sealing part 8 is equal to the cross-sectional area of the second sealing part 9.

[0061] The medium in the second chamber 3 generates a force on the first sealing portion 8 in a direction close to the first chamber 2, which is referred to as a first force. Meanwhile, the medium in the second chamber 3 generates a force on the second sealing portion 9 in a direction away from the first chamber 2, which is referred to as a second force. The first force is equal to the second force, that is, the medium in the second chamber 3 generates a zero force on the spool.

[0062] That is, when the isolation valve is used as a merge valve, the action of the spool depends on the force of the medium in the first chamber 2 on the spool and the force of the elastic member 10 on the spool. When the force of the medium in the first chamber 2 on the spool can overcome the force of the elastic member 10 on the spool, the spool slides to the open position. When the isolation valve is used as a split valve, the action of the spool depends on the force of the medium in the third chamber 4 on the spool and the force of the elastic member 10 on the spool. When the force of the medium in the third chamber 4 on the spool can overcome the force of the elastic member 10 on the spool, the spool slides to the open position.

[0063] It should be noted that, considering the friction factor, the force of the medium in the first chamber 2 on the spool or the force of the medium in the third chamber 4 on the spool needs to overcome n times the force of the elastic member 10 on the spool, where n is 1.2-1.5.

[0064] The area of the support portion 17 corresponding to the action chamber 28 is a first area, that is, the difference between the cross-sectional area of the support portion 17 and the cross-sectional area of the second sealing portion 9 is the first area. The cross-sectional area of the first sealing portion 8 is a second area.

[0065] In this embodiment, when designing the isolation valve, the first area is equal to the second area. In this way, if the spool can slide to the open position, the pressure required by the medium in the first chamber 2 when used as a merge valve is equal to the pressure required by the medium in the third chamber 4 when used as a split valve.

[0066] It can be understood that the isolation valve in this embodiment can be used as a merge valve and a split valve, and the opening pressure of the same isolation valve as a merge valve is consistent with the opening pressure as a split valve.

[0067] The isolation valve provided by the embodiment of the present application, when applied to the fuel supply system of a rocket engine, can ensure that the first isolation valve 26 and the second isolation valve 27 are not opened under the action of fuel vapor when the fuel in the fuel tank 20 evaporates to generate fuel vapor and the pressure of the fuel cavity 21 and the pressure cavity 22 increases when the rocket engine 25 is not working, for example, during transportation. In the embodiment, the opening pressure of the isolation valve as a combined valve is consistent with the opening pressure of the isolation valve as a separate valve, which is beneficial to the universality of the same type and specification of the isolation valve at the positions of the first isolation valve 26 and the second isolation valve 27.

[0068] For the second isolation valve 27, the opening pressure cannot be too large, otherwise the pressure requirement of the fuel cavity 21 when the second isolation valve 27 is opened is too large; at the same time, the opening pressure cannot be too small, otherwise the second isolation valve 27 is accidentally opened under the pressure of the fuel vapor in the fuel cavity 21. Therefore, the opening pressure of the second isolation valve 27 needs to be set within a certain pressure range.

[0069] In the specific embodiment, the cross section of the valve body 1 is circular, and correspondingly, the cross section of the valve core is also circular, that is, the cross section of the first sealing part 8, the cross section of the second sealing part 9, the cross section of the first sealing ring surface 11, the cross section of the second sealing ring surface 12 and the cross section of the support part 17 are all circular.

[0070] The diameter of the support part 17 is denoted as D2, and the diameter of the first sealing part 8 is denoted as D1, then the first area is , and the second area is . The first area is equal to the second area, that is , that is . That is .

[0071] Therefore, in the embodiment, the relationship between the diameter of the support part 17 and the diameter of the first sealing part 8 is set as 2×D1×D1=D2×D2, which can ensure that the opening pressure of the isolation valve as a separate valve is consistent with the opening pressure of the isolation valve as a combined valve.

[0072] In the embodiment of the present application, the cross-sectional area of the first interface 5 is equal to the cross-sectional area of the second interface 6, which is beneficial to improving the consistency of the medium flow and pressure at the first interface 5 and the second interface 6 and improving the consistency of the output speed of the fuel in the two fuel tanks 20.

[0073] In summary, the isolation valve provided by the embodiment of the present application is opened by relying on the pressure of the system itself, without the need for additional circuit or gas connection, which ensures the reliability of opening and the sealing reliability.

[0074] In another aspect, the present application also provides a fuel supply system of a rocket engine, which comprises the isolation valve provided by any of the above embodiments and two fuel tanks 20. The two fuel tanks 20 are used for storing fuel, the first interface 5 of the first isolation valve 26 and the second interface 6 of the first isolation valve 26 are respectively connected to the fuel outlets of the two fuel tanks 20, and the third interface 7 of the first isolation valve 26 is used for connecting to the fuel inlet of the engine 25. The pressure of the fuel in the two fuel tanks 20 is increased, and when the pressure in the two fuel tanks 20 reaches a certain value, the valve core of the isolation valve slides to the open position, so that the first chamber 2 is in communication with the second chamber 3, and the second chamber 3 is in communication with the third chamber 4, thereby enabling the fuel in the two fuel tanks 20 to flow into the third chamber 4 at the same time, and then into the combustion chamber of the engine 25, so that the two fuel tanks 20 supply fuel to the engine 25 at the same time, and the process does not need to rely on external driving force to control the isolation valve.

[0075] The beneficial effects of the fuel supply system of the rocket engine in the embodiments of the present application are deduced in a manner similar to the beneficial effects of the isolation valve, and thus will not be described here.

[0076] In the embodiments of the present application, the fuel tank 20 has a fuel chamber 21 and a pressurizing chamber 22, and the fuel chamber 21 and the pressurizing chamber 22 are separated by a diaphragm 23. The pressure of the fuel chamber 21 can be increased by increasing the pressure of the pressurizing chamber 22.

[0077] Specifically, the pressure of the pressurizing chamber 22 can be increased by filling the pressurizing chamber 22 with gas.

[0078] Correspondingly, the fuel supply system of the rocket engine also comprises a second isolation valve 27 and a gas supply device 24. The structure of the second isolation valve 27 is the same as that of the first isolation valve 26, the first interface 5 of the second isolation valve 27 and the second interface 6 of the second isolation valve 27 are respectively connected to the pressurizing chambers 22 of the two fuel tanks 20, and the gas supply end of the gas supply device 24 is connected to the third interface 7 of the second isolation valve 27.

[0079] It should be noted that the valve core of the second isolation valve 27 has a support portion 17, the valve body 1 of the second isolation valve 27 has a fourth chamber 16, and when the valve core of the second isolation valve 27 is in the closed position, the support portion 17 is located on the side of the second sealing ring surface 12 away from the first sealing ring surface 11, and there is a gap between the end surface of the support portion 17 facing the second chamber 3 and the inner wall of the valve body 1, that is, an annular action chamber 28, which is in communication with the third chamber 4.

[0080] In this way, by means of the gas supply device 24, the pressure of the third chamber 4 of the second isolation valve 27 can be increased, so that the valve core of the second isolation valve 27 slides to the open position, and the first chamber 2 and the second chamber 3 of the second isolation valve 27 are both connected to the third chamber 4, so that the two fuel tanks 20 can be simultaneously filled with gas in the pressure chambers 22, so as to simultaneously increase the pressure of the fuel chambers 21 of the two fuel tanks 20. In this way, the pressure in the first chamber 2 and the second chamber 3 of the first isolation valve 26 is increased, so that the valve core of the first isolation valve 26 slides to the open position, and the first chamber 2 and the second chamber 3 of the first isolation valve 26 are both connected to the third chamber 4, so that the fuel in the fuel chambers 21 of the two fuel tanks 20 is simultaneously supplied to the combustion chamber of the engine 25.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An isolation valve, characterized in that, include: The valve body (1) has a first chamber (2), a second chamber (3) and a third chamber (4) arranged sequentially along a reference direction. The valve body (1) is provided with a first interface (5) communicating with the first chamber (2), a second interface (6) communicating with the second chamber (3) and a third interface (7) communicating with the third chamber (4). The valve core is disposed inside the valve body (1) in a reciprocating sliding manner along the reference direction, the end face of the valve core faces the first chamber (2), and the valve core has a first sealing part (8) and a second sealing part (9). The elastic element (10) is adapted to give the valve core a tendency to slide in a direction close to the first chamber (2); The valve core is adapted to slide between a cut-off position and a conduction position under the action of the medium in the first chamber (2), the medium in the second chamber (3), and the elastic element (10). In the cut-off position, the first sealing part (8) isolates the first chamber (2) from the second chamber (3), and the second sealing part (9) isolates the second chamber (3) from the third chamber (4). In the conduction position, the first chamber (2) communicates with the second chamber (3), and the second chamber (3) communicates with the third chamber (4).

2. The isolation valve according to claim 1, characterized in that, A first sealing ring surface (11) is formed between the first chamber (2) and the second chamber (3). Along the reference direction, the projection area of ​​the first chamber (2) is located within the projection area of ​​the first sealing ring surface (11). The circumferential side surface of the first sealing part (8) is adapted to the first sealing ring surface (11). A second sealing ring surface (12) is formed between the second chamber (3) and the third chamber (4). The circumferential side surface of the second sealing part (9) is adapted to the second sealing ring surface (12). The isolation valve also includes: The first sealing element (13) is disposed between the first sealing part (8) and the first sealing ring surface (11); The second seal (14) is disposed between the second sealing part (9) and the second sealing ring surface (12).

3. The isolation valve according to claim 2, characterized in that, Along the reference direction, the projection area of ​​the first sealing part (8) is located within the projection area of ​​the second chamber (3), and the length dimension of the first sealing part (8) is smaller than the length dimension of the second chamber (3); An annular groove (15) is formed between the first sealing part (8) and the second sealing part (9), and the length of the annular groove (15) is at least greater than the length of the first sealing ring surface (11) along the reference direction.

4. The isolation valve according to claim 3, characterized in that, The valve body (1) also has a fourth chamber (16), which is located on the side of the third chamber (4) away from the second chamber (3); The valve core also has a support portion (17), which is located on the side of the second sealing portion (9) away from the first sealing portion (8). The circumferential side of the support portion (17) is adapted to the inner wall of the fourth chamber (16). The elastic element (10) is disposed in the fourth chamber (16). The valve body (1) is provided with a vent hole (18) communicating with the fourth chamber (16). The isolation valve also includes: The third sealing element (19) is disposed between the support (17) and the inner wall of the fourth chamber (16).

5. The isolation valve according to claim 4, characterized in that, Along the reference direction, the projection area of ​​the circumferential side of the second sealing part (9) is located within the projection area of ​​the circumferential side of the support part (17); When the valve core is in the cut-off position, the support part (17) is located on the side of the second sealing ring surface (12) away from the first sealing ring surface (11), and there is a gap between the end face of the support part (17) facing the second chamber (3) and the inner wall of the valve body (1), forming an annular working cavity (28), which is connected to the third chamber (4).

6. The isolation valve according to claim 5, characterized in that, Along the reference direction, the projection area of ​​the first sealing ring surface (11) coincides with the projection area of ​​the second sealing ring surface (12), the area on the support part (17) corresponding to the working cavity (28) is the first area, the cross-sectional area of ​​the first sealing part (8) is the second area, and the first area and the second area are equal.

7. The isolation valve according to claim 6, characterized in that, The cross-section of the support part (17) is circular, and the diameter of the support part (17) is D2. The cross-section of the first sealing part (8) is circular, and the diameter of the first sealing part (8) is D1. The relationship between the diameter of the support part (17) and the diameter of the first sealing part (8) is 2×D1×D1=D2×D2.

8. The isolation valve according to claim 1, characterized in that, The cross-sectional area of ​​the first interface (5) is equal to the cross-sectional area of ​​the second interface (6).

9. A fuel supply system for a rocket engine, characterized in that, include: Two fuel tanks (20) are used to store fuel; The first isolation valve (26) is an isolation valve as described in any one of claims 1 to 8, wherein the first port (5) and the second port (6) of the first isolation valve (26) are respectively connected to the fuel outlets of the two fuel tanks (20), and the third port (7) of the first isolation valve (26) is adapted to be connected to the fuel inlet of the engine (25).

10. The fuel supply system for a rocket engine according to claim 9, characterized in that, The fuel tank (20) has a fuel chamber (21) and a pressurization chamber (22), the fuel chamber (21) and the pressurization chamber (22) being separated by a diaphragm (23). The fuel supply system of the rocket engine also includes: The second isolation valve (27) has the same structure as the first isolation valve (26). The first port (5) and the second port (6) of the second isolation valve (27) are respectively connected to the pressurization chambers (22) of the two fuel tanks (20). Gas supply device (24), the gas supply end of which is connected to the third interface (7) of the second isolation valve (27).

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