Drain valve, rocket engine and rocket

Abstract

The application relates to a relief valve, a rocket engine and a rocket. The relief valve comprises a shell assembly, a valve core, a valve seat, a driving mechanism and a first reset member. The shell assembly is provided with a containing cavity, a medium inlet and a medium outlet which are communicated with the containing cavity; the valve seat is detachably arranged in the containing cavity and located between the medium inlet and the medium outlet, and the valve seat is provided with a through liquid passage; the valve core is movably arranged in the containing cavity, and the valve core has a closed position for blocking the liquid passage and an open position for opening the liquid passage; the driving mechanism is connected with the valve core, and the driving mechanism is used for driving the valve core to move from the closed position to the open position; one end of the first reset member is connected with the shell assembly, and the other end of the first reset member is connected with the valve core, and the first reset member is used for driving the valve core to reset to the closed position. The relief valve saves the maintenance cost, shortens the maintenance period and can meet the requirement of repeated use of the rocket engine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rocket engine valves, in particular to a relief valve, a rocket engine and a rocket. BACKGROUND

[0002] Reducing cost, improving maintainability and universality are the future development trends of liquid rocket engines, which puts forward new requirements for the design concept of valve products in the engine system. The relief valve is an important part of the valve products in the rocket engine. By controlling the opening of the relief valve during the shutdown stage of the engine, the relief of the propellant in the engine can be realized.

[0003] In related technologies, the maintenance of liquid rocket engine valves is difficult and costly, so most liquid rocket engine valves are one-time use valves, which cannot meet the repeated use requirements of rocket engines. SUMMARY

[0004] Therefore, it is necessary to provide a relief valve, a rocket engine and a rocket for reducing the maintenance difficulty and cost of the rocket engine valve.

[0005] The first aspect of the present application provides a relief valve, comprising:

[0006] A housing assembly, the housing assembly is provided with a cavity, a medium inlet and a medium outlet communicating with the cavity;

[0007] A valve seat, the valve seat is detachably arranged in the cavity and located between the medium inlet and the medium outlet, the valve seat is provided with a liquid passage communicating the medium inlet and the medium outlet;

[0008] A valve core, the valve core is movably arranged in the cavity, the valve core has a closed position for blocking the liquid passage and an open position for opening the liquid passage;

[0009] A driving mechanism, the driving mechanism is connected with the valve core, and the driving mechanism is used for driving the valve core to move from the closed position to the open position;

[0010] A first reset member, one end of the first reset member is connected with the housing assembly, and the other end of the first reset member is connected with the valve core, the first reset member is used for driving the valve core to reset to the closed position.

[0011] The technical solutions are further described as follows:

[0012] In one of the embodiments, the shell assembly comprises a shell and a first end cover, the cavity is formed through two ends of the shell, the medium inlet and the medium outlet are respectively formed on opposite sides of the shell, and the medium inlet and the medium outlet are spaced in the axial direction of the shell.

[0013] The first end cover is sealingly connected to one end of the shell, and the driving mechanism is sealingly connected to the other end of the shell.

[0014] The first reset member, the valve core and the valve seat are sequentially arranged in the cavity along the direction in which the first end cover points to the driving mechanism.

[0015] In one of the embodiments, the valve core is provided with a sealing ring at one end close to the valve seat, and the valve seat is provided with a sealing boss at one side close to the valve core, the sealing ring sealingly abuts against the sealing boss to block the liquid passage when the valve core is in the closed position, and the sealing ring is separated from at least part of the sealing boss to open the liquid passage when the valve core is in the open position.

[0016] In one of the embodiments, the valve seat is in interference fit with the cavity wall of the cavity, and / or the valve seat is made of stainless steel and the shell is made of aluminum alloy, and / or a first sealing gasket is arranged between the first end cover and the shell.

[0017] In one of the embodiments, the cavity wall of the cavity is formed with a first positioning step, the first positioning step faces away from the valve core, the outer wall of the valve seat is formed with a second positioning step, the second positioning step faces the valve core, the second positioning step is in abutting fit with the first positioning step, and a second sealing gasket is arranged between the second positioning step and the first positioning step.

[0018] In one of the embodiments, the valve core is provided with a weight-reducing hole at one end away from the valve seat, one end of the first reset member abuts against the first end cover, and the other end of the first reset member penetrates into the weight-reducing hole and abuts against the hole bottom of the weight-reducing hole.

[0019] In one of the embodiments, the driving mechanism comprises:

[0020] A cylinder shell is provided with a piston cavity, and the cylinder shell is detachably connected with the shell assembly.

[0021] A piston member is movably arranged in the piston cavity.

[0022] A top rod is connected at one end with the piston member, and the other end of the top rod is arranged opposite to the valve core after penetrating out of the cylinder shell and penetrating through the liquid passage.

[0023] a second end cover connected with the cylinder shell away from one end of the housing assembly, the second end cover being provided with a gas control port communicated with the piston cavity, the gas control port being used for passing in control gas to drive the piston member to move towards the valve core to drive the top rod to abut to the valve core and drive the valve core to move to the open position; and

[0024] a second reset member, one end of the second reset member being connected with the cavity wall of the piston cavity, the other end of the second reset member being connected with the piston member, the second reset member being used for driving the piston member to move away from the valve core to drive the top rod to separate from the valve core.

[0025] In one of the embodiments, the cylinder shell is partially inserted into the cavity and abuts to one end of the valve seat away from the valve core; and / or,

[0026] a first spring energy storage sealing ring is arranged between the piston member and the cylinder shell; and / or,

[0027] a second spring energy storage sealing ring is arranged between the top rod and the cylinder shell; and / or,

[0028] a third sealing gasket is arranged between the cylinder shell and the housing assembly; and / or,

[0029] a fourth sealing gasket is arranged between the cylinder shell and the second end cover; and / or,

[0030] the diameter of the piston member is greater than the diameter of the valve core; and / or,

[0031] the driving mechanism further comprises a discharge nozzle connected with the cylinder shell, the discharge nozzle being provided with a discharge port communicated with the piston cavity, the discharge port being used for discharging working medium into the piston cavity.

[0032] In a second aspect, the application further provides a rocket engine comprising the discharge valve.

[0033] In a third aspect, the application further provides a rocket comprising the rocket engine.

[0034] The leakage valve, the rocket engine and the rocket, by setting an independent valve seat in the cavity of the shell assembly, the valve seat is provided with a liquid passage connecting the medium inlet and the medium outlet, so that the valve core is driven by the driving mechanism to block or open the liquid passage, and the leakage valve can be opened or closed. Compared with the traditional integrated boss valve seat structure processed in the shell of the valve, the leakage valve of the present application sets an independent and detachable valve seat in the cavity of the shell assembly, so that when the valve seat is damaged, only a new valve seat needs to be replaced, without replacing the entire shell assembly, and without polishing the boss valve seat by machine tool and anodizing, saving the maintenance cost, shortening the maintenance period, and meeting the demand of repeated use of the rocket engine. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve the purpose of explaining the present application. The present application should not be limited by the accompanying drawings.

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0037] In addition, the drawings are not drawn in the ratio of 1:1, and the relative sizes of the elements are only exemplarily drawn in the drawings, not necessarily drawn in the true ratio. In the drawings:

[0038] Figure 1 Structure schematic view of the leakage valve of an embodiment.

[0039] Figure 2 Structure schematic view of the leakage valve of an embodiment. Figure 1 Cross-sectional view of the leakage valve shown in the structure schematic view of the leakage valve of an embodiment in the closed state.

[0040] Figure 3 Cross-sectional view of the leakage valve shown in the structure schematic view of the leakage valve of an embodiment in the open state. Figure 1

[0041] Structure schematic view of the valve seat of the leakage valve of an embodiment. Figure 4

[0042] Structure schematic view of the valve core of the leakage valve of an embodiment. Figure 5

[0043] Structure schematic view of the driving mechanism of the leakage valve of an embodiment. Figure 6 Explanation of reference signs:

[0044]

[0045] ​10, housing assembly; 11, housing; 111, medium inlet; 112, medium outlet; 113, cavity; 114, first positioning step; 115, second sealing gasket; 12, first end cover; 121, first sealing gasket; 20, driving mechanism; 21, cylinder housing; 211, piston cavity; 212, third sealing gasket; 22, second end cover; 221, pneumatic control port; 222, fourth sealing gasket; 23, piston member; 24, ejector rod; 25, second return member; 26, discharge nozzle; 261, discharge port; 271, second spring-energized seal ring; 272, second blocking ring; 273, first spring-energized seal ring; 274, first blocking ring; 30, valve core; 31, seal ring; 32, weight-reducing hole; 40, valve seat; 41, liquid passage; 42, second positioning step; 43, sealing boss; 50, first return member. DETAILED DESCRIPTION

[0046] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners, which are different from those described herein, and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0049] In this application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connection", "fixing", etc. should be understood broadly. For example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be internal communication of two elements, or interaction relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, if there is a similar description of the first feature "on" or "under" the second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0051] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If there is, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for illustrative purposes, not the only embodiment.

[0052] As described in the background, the current relief valve is difficult to maintain and has high cost. The reason is that: the current relief valve is usually a one-piece boss valve seat machined in the shell, and the opening and closing of the relief valve are realized by the cooperation of the boss valve seat and the valve core. However, when the boss valve seat is damaged, under the new demand of liquid rocket engine reuse, the entire shell needs to be replaced or the boss valve seat needs to be repaired (the boss valve seat is polished and anodized), resulting in long maintenance period and high cost.

[0053] Based on this, an embodiment of the present application provides a relief valve which can be used in liquid oxygen path of liquid rocket engine, and can realize the relief of residual liquid oxygen in the engine after the rocket engine is shut down. It can also be used in other ultra-low temperature working medium (liquid methane, liquid hydrogen) and normal temperature working medium (kerosene) engine systems, which is not limited here. Specifically, see Figure 1 and Figure 2The drain valve of one embodiment comprises a housing assembly 10, a valve core 30, a valve seat 40, a driving mechanism 20 and a first reset member 50.

[0054] Referring to Figure 2 The housing assembly 10 is provided with a cavity 113, a medium inlet 111 and a medium outlet 112, the medium inlet 111 and the medium outlet 112 are communicated with the cavity 113, the medium inlet 111 is used for the working medium to enter the cavity 113, and the medium outlet 112 is used for the working medium to flow out of the cavity 113, wherein the working medium includes but is not limited to liquid oxygen, liquid methane, liquid hydrogen and kerosene.

[0055] The valve seat 40 is detachably arranged in the cavity 113, that is, the valve seat 40 is independent of the housing assembly 10. Further, the valve seat 40 is located between the medium inlet 111 and the medium outlet 112. In combination with Figure 4 The valve seat 40 is provided with a liquid passing channel 41 which is communicated between the medium inlet 111 and the medium outlet 112. Understandably, the working medium can flow to the medium outlet 112 through the liquid passing channel 41 after entering the cavity 113 from the medium inlet 111.

[0056] Referring to Figure 2 The valve core 30 is movably arranged in the cavity 113, and the valve core 30 has an open position and a closed position. Referring to Figure 3 In the open position, the valve core 30 opens the liquid passing channel 41, so that the medium inlet 111 and the medium outlet 112 are communicated, thereby enabling the working medium to flow into the cavity 113 from the medium inlet 111 and flow out of the medium outlet 112 after passing through the liquid passing channel 41. Referring to Figure 2 In the closed position, the valve core 30 blocks the liquid passing channel 41, so that the medium inlet 111 and the medium outlet 112 are separated, thereby blocking the flow of the working medium between the medium inlet 111 and the medium outlet 112.

[0057] The driving mechanism 20 is connected with the valve core 30, and the driving mechanism 20 is used to drive the valve core 30 to move from the closed position to the open position, so that the drain valve is opened, and at this time the working medium can flow from the medium inlet 111 to the medium outlet 112.

[0058] Referring to Figure 2 One end of the first reset member 50 is in abutment with the housing assembly 10, and the other end of the first reset member 50 is in abutment with the valve seat 40, and the first reset member 50 is used to drive the valve core 30 to reset to the closed position, thereby realizing the closing of the drain valve. Optionally, the first reset member 50 can be a linear spring.

[0059] Specifically, referring to Figure 2 , Figure 2The structure of the relief valve in the closed state is shown in FIG. 1. When the relief valve is in the closed state, the spool 30 is maintained in the closed position under the combined action of the first return member 50 and the working medium entering the side of the spool 30 close to the first return member 50 from the cooperation gap between the spool 30 and the cavity wall of the cavity 113, at which time the spool 30 abuts against the valve seat 40 to block the liquid passage 41 between the medium inlet 111 and the medium outlet 112, thereby blocking the flow of working medium between the medium inlet 111 and the medium outlet 112, achieving the closing of the relief valve.

[0060] Further, as shown in FIG. 1, when it is necessary to open the relief valve, the driving mechanism 20 drives the spool 30 to move to the open position against the restoring force of the first return member 50 and the pressure of the working medium, at which time the spool 30 is separated from the valve seat 40 to open the liquid passage 41, so that the medium inlet 111 and the medium outlet 112 are connected, achieving the opening of the relief valve, and the working medium can flow from the medium inlet 111 to the medium outlet 112. Figure 3

[0061] In the above-mentioned relief valve, by arranging the independent valve seat 40 in the cavity 113 of the housing assembly 10, the valve seat 40 is provided with the liquid passage 41 connecting the medium inlet 111 and the medium outlet 112, so that the relief valve can be opened or closed by driving the spool 30 to block or open the liquid passage 41 by the driving mechanism 20. Compared with the traditional structure of machining an integral boss valve seat 40 in the housing 11 of the valve, the relief valve of the present application is provided with an independent and detachable valve seat 40 in the cavity 113 of the housing assembly 10, so that when the valve seat 40 is damaged, only a new valve seat 40 needs to be replaced, without the need to replace the entire housing assembly 10, and without the need to polish the boss valve seat 40 by a machine tool and perform anodizing, thereby saving maintenance costs, shortening the maintenance period, and meeting the demand for repeated use of the rocket engine.

[0062] Referring to FIG. 1, in some embodiments, the housing assembly 10 includes the housing 11 and the first end cover 12, the cavity 113 penetrates through both ends of the housing 11, the medium inlet 111 and the medium outlet 112 are arranged on opposite sides of the housing 11, and the medium inlet 111 and the medium outlet 112 are spaced apart in the axial direction of the housing 11, i.e., the medium inlet 111 and the medium outlet 112 are arranged in axial displacement on the housing 11. Understandably, in other embodiments, the medium inlet 111 and the medium outlet 112 can also be arranged oppositely or at right angles, which is not limited herein. Figure 2 Referring to FIG. 1, in some embodiments, the housing assembly 10 includes the housing 11 and the first end cover 12, the cavity 113 penetrates through both ends of the housing 11, the medium inlet 111 and the medium outlet 112 are arranged on opposite sides of the housing 11, and the medium inlet 111 and the medium outlet 112 are spaced apart in the axial direction of the housing 11, i.e., the medium inlet 111 and the medium outlet 112 are arranged in axial displacement on the housing 11. Understandably, in other embodiments, the medium inlet 111 and the medium outlet 112 can also be arranged oppositely or at right angles, which is not limited herein.

[0063] Figure 2 ​​In some embodiments, the first end cover 12 is sealingly connected to one end of the housing 11, and the driving mechanism 20 is sealingly connected to the other end of the housing 11. Specifically, the first end cover 12 and the housing 11 can be connected by a flange connection with studs and nuts, and a first sealing gasket 121 is arranged between the first end cover 12 and the housing 11 to achieve sealing therebetween. Understandably, in other embodiments, the first end cover 12 and the housing 11 can also be integrally formed, which is not limited herein.

[0064] Referring to Figure 2 , the driving mechanism 20 is sealingly connected to the other end of the housing 11. Similarly, the driving mechanism 20 and the housing 11 can be connected by a flange connection with studs and nuts, and a third sealing gasket 212 is arranged between the driving mechanism 20 and the housing 11 to achieve sealing therebetween.

[0065] Specifically, in some embodiments, the first reset member 50, the valve core 30 and the valve seat 40 are sequentially arranged in the cavity 113 along the direction from the first end cover 12 to the driving mechanism 20. Specifically, one end of the first reset member 50 abuts against the first end cover 12, and the other end of the first reset member 50 abuts against the side of the valve core 30 away from the valve seat 40, so that the valve core 30 is driven to abut against the valve seat 40 under the elastic force of the first reset member 50 and the pressure of the medium, so that the valve core 30 enters and maintains in the closed position.

[0066] Referring to Figure 5 Optionally, in some embodiments, the valve core 30 is provided with a sealing ring 31 at the end close to the valve seat 40, and when the valve core 30 is in the closed position, the sealing ring 31 sealingly abuts against the valve seat 40 to block the liquid passage 41; when the valve core 30 is in the open position, the sealing ring 31 is separated from at least part of the valve seat 40 to open the liquid passage 41.

[0067] Optionally, the sealing ring 31 can be a non-metallic sealing material, and the end face of the end of the valve core 30 close to the valve seat 40 is provided with a first annular embedding groove, and the sealing ring 31 is embedded in the first annular embedding groove, so as to ensure reliable connection of the sealing ring 31 and the valve core 30.

[0068] Further, referring to Figure 4 , the valve seat 40 is provided with a sealing boss 43 at the end close to the valve core 30, and when the valve core 30 is in the closed position, the sealing ring 31 sealingly abuts against the sealing boss 43 to block the liquid passage 41; when the valve core 30 is in the open position, the sealing ring 31 is separated from at least part of the sealing boss 43 to open the liquid passage 41.

[0069] In some embodiments, the sealing boss 43 of the valve seat 40 is formed by combined machining. Specifically, before assembly, the sealing boss 43 on the valve seat 40 is not machined first, and after the part in the cavity 113 of the housing 11 that is in interference fit with the valve seat 40 is machined, the valve seat 40 is fixed in the housing 11, and then the part in the cavity 113 of the housing 11 that is in cooperation with the valve core 30 and the sealing boss 43 on the valve seat 40 are machined synchronously to ensure the coaxiality of the two.

[0070] Optionally, in an embodiment, the valve seat 40 is made of stainless steel, and the housing 11 is made of aluminum alloy. Specifically, unlike the aluminum alloy selected due to the weight reduction requirement of the housing 11, the valve seat 40 is made of stainless steel, so that the valve seat 40 does not need to be subjected to complex anodizing surface treatment and has the advantage of higher surface roughness.

[0071] Referring to Figure 2 In some embodiments, the cavity wall of the cavity 113 is formed with a first positioning step 114, and the first positioning step 114 faces away from the valve core 30. In combination with Figure 4 The outer wall of the valve seat 40 is formed with a second positioning step 42, and the second positioning step 42 faces the valve core 30. The second positioning step 42 is in abutting cooperation with the first positioning step 114, thereby limiting the movement of the valve seat 40 towards the valve core 30, improving the positioning stability of the valve seat 40, and further improving the sealing effect when the valve seat 40 abuts against the sealing ring 31 on the valve core 30.

[0072] Further, a second sealing gasket 115 is arranged between the second positioning step 42 and the first positioning step 114, thereby achieving the sealing between the valve seat 40 and the cavity wall of the cavity 113, and preventing the working medium from leaking from the cooperation gap between the valve seat 40 and the cavity wall of the cavity 113.

[0073] Referring to Figure 5 In some embodiments, the valve core 30 is provided with a weight reduction hole 32 at the end away from the valve seat 40. In combination with Figure 2 One end of the first return member 50 abuts against the first end cover 12, and the other end of the first return member 50 penetrates into the weight reduction hole 32 and abuts against the hole bottom of the weight reduction hole 32. The weight reduction hole 32 can reduce the weight of the valve seat 40, so that the driving mechanism 20 and the first return member 50 are more easily driven to move the valve core 30, and the overall weight of the relief valve can also be reduced. In addition, the weight reduction hole 32 can also have a certain limiting effect on the first return member 50, preventing the first return member 50 from separating from the valve core 30.

[0074] Referring to Figure 6 In some embodiments, the driving mechanism 20 includes a cylinder shell 21, a piston member 23, a top rod 24, a second end cover 22, and a second return member 25. Among them:

[0075] The cylinder shell 21 is provided with a piston cavity 211, and the cylinder shell 21 is connected with the shell assembly 10. Specifically, the shell 11 is connected with the second end cover 22. Figure 2 Optionally, the cylinder shell 21 and the shell 11 can be connected by a flange with a stud and a nut, and a third sealing gasket 212 is arranged between the cylinder shell 21 and the shell 11, so as to realize the sealing between the cylinder shell 21 and the shell 11.

[0076] Further, part of the cylinder shell 21 penetrates into the cavity 113 and abuts against the end of the valve seat 40 away from the valve core 30, so as to limit the movement of the valve seat 40 towards the driving mechanism 20, further improve the positioning stability of the valve core 30 in the cavity 113, and further improve the sealing effect when the valve seat 40 abuts against the sealing ring 31 on the valve core 30.

[0077] Continuing to refer to Figure 6 The piston piece 23 is movably arranged in the piston cavity 211, one end of the jack 24 is connected with the piston piece 23, and the other end of the jack 24 penetrates out of the cylinder shell 21 and is arranged opposite to the valve core 30 through the liquid passage 41. Optionally, in an embodiment, the piston piece 23 and the jack 24 are integrally formed, and in other embodiments, the piston piece 23 and the jack 24 can be connected by thread connection, nesting connection or adhesion.

[0078] The second end cover 22 is connected with the end of the cylinder shell 21 away from the shell 11. Optionally, the second end cover 22 and the cylinder shell 21 can also be connected by a flange with a stud and a nut, and a fourth sealing gasket 222 is arranged between the second end cover 22 and the cylinder shell 21, so as to realize the sealing between the second end cover 22 and the cylinder shell 21.

[0079] Further, the second end cover 22 is provided with a gas control port 221 communicating with the piston cavity 211, and the gas control port 221 is used for introducing control gas to drive the piston piece 23 to move towards the valve core 30, so as to drive the jack 24 to abut against the valve core 30 and drive the valve core 30 to move to the open position.

[0080] Specifically, by introducing high-pressure control gas into the gas control port 221, the piston piece 23 can be driven to move towards the valve core 30, and the jack 24 moves synchronously with the piston piece 23, so that the jack 24 abuts against the valve core 30 and drives the valve core 30 to move to the open position, at this time, the valve core 30 is separated from the valve seat 40, so that the liquid passage 41 is opened, thereby realizing the opening of the passage between the medium inlet 111 and the medium outlet 112.

[0081] Continuing to refer to Figure 6One end of the second reset member 25 is connected to the cavity wall of the piston chamber 211, and the other end of the second reset member 25 is connected to the piston member 23. The second reset member 25 is used to drive the piston member 23 to move away from the valve core 30, so as to drive the push rod 24 to separate from the valve core 30. Specifically, the second reset member 25 can be a linear spring. When the control air is not introduced into the pneumatic control port 221 or the control air is removed, the piston member 23 can be reset to the initial position away from the valve core 30 under the elastic force of the second reset member 25, so that the push rod 24 separates from the valve core 30, and then the valve core 30 is reset to the closed position under the combined action of the first reset member 50 and the working medium, so as to realize the closure of the relief valve.

[0082] Specifically, in this embodiment, a cylinder mechanism is used as the drive mechanism 20 to drive the valve core 30 to open. The control is simple. Since the cylinder mechanism is installed in the housing 11 as a disassembled part, the cylinder mechanism designed in this way is installed on the housing 11 as an independent component. Its structure and function are independent, and it can be independently processed, assembled, tested, and stored. It can also be quickly replaced according to product maintenance or product function changes, which improves the maintainability of the relief valve.

[0083] It is worth noting that in other embodiments, electric push rods or solenoid valves can also be used as the driving mechanism 20, which can also drive the valve core 30 and open the valve core 30. No limitation is made here.

[0084] See also Figure 6 Optionally, in some embodiments, a first spring-loaded sealing ring 273 is provided between the piston 23 and the cylinder housing 21 to achieve a seal between the piston 23 and the cylinder housing 21, preventing leakage of the working medium. Specifically, the first spring-loaded sealing ring 273 is sleeved on the end of the piston 23 near the second end cap 22. Further, a first retaining ring 274 is also sleeved on the end of the piston 23 near the second end cap 22. The first retaining ring 274 is located on the side of the first spring-loaded sealing ring 273 near the second end cap 22, and is used to limit the first spring-loaded sealing ring 273 to prevent it from detaching from the piston 23.

[0085] See Figure 6In some embodiments, a second spring-loaded sealing ring 271 is provided between the push rod 24 and the cylinder housing 21 to achieve a seal between the push rod 24 and the cylinder housing 21, preventing leakage of the working medium. Specifically, the second spring-loaded sealing ring 271 is sleeved on the section of the push rod 24 that extends out of the piston chamber 211. Further, a second retaining ring 272 is also sleeved on the push rod 24. The second retaining ring 272 is located on the side of the second spring-loaded sealing ring 271 near the valve core 30. The second retaining ring 272 is used to limit the second spring-loaded sealing ring 271 and prevent it from detaching from the push rod 24.

[0086] Specifically, in this embodiment, a spring-energy-storing sealing ring 31 is used instead of the bellows used as the dynamic seal in traditional cryogenic valves. This is because bellows have disadvantages such as complex structure, weak pressure-bearing capacity, increased wall thickness and rigidity at high pressures leading to small deformation displacement, and high cost and long development cycle due to difficulties in hydraulic forming or other processing methods. In contrast, the spring-energy-storing sealing ring 31 theoretically allows for an infinitely large and unrestricted displacement of the dynamic seal. It not only possesses the advantages of a simple spring + external non-metallic skeleton structure capable of withstanding high pressure, but also offers the advantage of easy procurement. These advantages simplify the dynamic seal design of the relief valve, reduce the R&D and manufacturing costs, shorten the R&D cycle, and improve the economic efficiency of the relief valve. Furthermore, the simple structure of the spring-energy-storing sealing ring 31 also meets the requirements for weight reduction.

[0087] In some embodiments, the diameter of the piston 23 is larger than the diameter of the valve core 30. Specifically, according to the pressure formula, under a constant force, the pressure is inversely proportional to the pressure-bearing area. Therefore, by configuring the diameter of the piston 23 to be larger than the diameter of the valve core 30, the piston 23 can be driven by a smaller air pressure to move the valve core 30 against a larger working medium pressure, ensuring that the valve core 30 can be smoothly opened under a lower control pressure.

[0088] See Figure 6 The drive mechanism 20 also includes a discharge nozzle 26, which is connected to the cylinder housing 21. The discharge nozzle 26 has an outlet 261 communicating with the piston chamber 211. The outlet 261 is used to discharge the working medium entering the piston chamber 211, preventing the working medium from affecting the movement of the piston component 23. Optionally, the discharge nozzle 26 is connected to the flange of the cylinder housing 21. There can be multiple discharge nozzles 26, such as two, three, four or more, arranged circumferentially around the cylinder housing 21.

[0089] In some embodiments, this application also provides a rocket engine, which may specifically be a liquid rocket engine. One embodiment of the rocket engine includes a vent valve from any of the above embodiments. The vent valve can be used in the liquid oxygen circuit of the liquid rocket engine, enabling the release of residual liquid oxygen from the engine after shutdown.

[0090] In some embodiments, this application also provides a rocket, which may specifically be a liquid-fueled rocket. One embodiment of the rocket includes the rocket engine of any of the above embodiments.

[0091] In the aforementioned rocket and rocket engine, the vent valve utilizes an independent valve seat 40 within the cavity 113 of the housing assembly 10. The valve seat 40 has a liquid passage 41 connecting the medium inlet 111 and the medium outlet 112. The valve valve can be opened or closed by driving the valve core 30 via the drive mechanism 20 to block or open the liquid passage 41. Compared to the traditional method of machining an integral boss valve seat 40 within the valve housing 11, the vent valve of this application features an independent and detachable valve seat 40 within the cavity 113 of the housing assembly 10. Therefore, when the valve seat 40 is damaged, only a new valve seat 40 needs to be replaced directly, without replacing the entire housing assembly 10 or polishing and anodizing the boss valve seat 40 using a machine tool. This saves maintenance costs, shortens the maintenance cycle, and meets the requirements for repeated use of rocket engines.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A relief valve, characterized in that, include: A housing assembly having a cavity and a medium inlet and a medium outlet communicating with the cavity; A valve seat is detachably disposed in the cavity and located between the medium inlet and the medium outlet, and the valve seat is provided with a liquid passage connecting the medium inlet and the medium outlet. A valve core is movably disposed in the cavity, and the valve core has a closed position that blocks the liquid passage and an open position that opens the liquid passage; A drive mechanism is connected to the valve core, and the drive mechanism is used to drive the valve core from the closed position to the open position; A first reset member, one end of which is connected to the housing assembly and the other end of which is connected to the valve core, is used to drive the valve core from the open position to the closed position. The cavity wall of the cavity is formed with a first positioning step, which faces away from the valve core. The outer wall of the valve seat protrudes to form a second positioning step, which faces the valve core. One side of the second positioning step abuts against the first positioning step. The drive mechanism includes: The cylinder housing has a piston chamber and is detachably connected to the housing assembly. A portion of the cylinder housing extends into the cavity and abuts against the other side of the second positioning step. A piston assembly, which is movably disposed within the piston chamber; A push rod, one end of which is connected to the piston, and the other end of which passes through the cylinder housing and the liquid passage and is positioned opposite to the valve core; A second end cap is connected to the end of the cylinder housing opposite to the housing assembly. The second end cap has a pneumatic control port communicating with the piston chamber. This port is used to introduce control air to drive the piston towards the valve core, thereby causing the push rod to abut against the valve core and move the valve core to the open position. The second reset member has one end connected to the cavity wall of the piston chamber and the other end connected to the piston member. The second reset member is used to drive the piston member to move away from the valve core, so as to drive the push rod to separate from the valve core.

2. The relief valve according to claim 1, characterized in that, The housing assembly includes a housing and a first end cap. The cavity extends through both ends of the housing. The medium inlet and the medium outlet are respectively located on opposite sides of the housing, and the medium inlet and the medium outlet are spaced apart in the axial direction of the housing. The first end cap is sealed to one end of the housing, and the drive mechanism is sealed to the other end of the housing; The first reset member, the valve core, and the valve seat are sequentially arranged in the cavity along the direction from the first end cover toward the drive mechanism.

3. The relief valve according to claim 2, characterized in that, The valve core is provided with a sealing ring at one end near the valve seat; the valve seat is provided with a sealing boss on one side near the valve core. When the valve core is in the closed position, the sealing ring and the sealing boss seal against each other to block the liquid passage; when the valve core is in the open position, the sealing ring and at least part of the sealing boss separate to open the liquid passage.

4. The relief valve according to claim 2, characterized in that, The valve seat is interference-fitted with the cavity wall; and / or the valve seat is made of stainless steel and the housing is made of aluminum alloy; and / or a first sealing gasket is provided between the first end cap and the housing.

5. The relief valve according to claim 2, characterized in that, The valve core has a weight reduction hole at one end away from the valve seat. One end of the first reset member abuts against the first end cap, and the other end of the first reset member passes through the weight reduction hole and abuts against the bottom of the weight reduction hole.

6. The relief valve according to claim 1, characterized in that, A second sealing gasket is provided between the second positioning step and the first positioning step.

7. The relief valve according to claim 6, characterized in that: A first spring energy storage sealing ring is provided between the piston and the cylinder housing; A second spring energy storage sealing ring is provided between the push rod and the cylinder housing; A third sealing gasket is provided between the cylinder housing and the housing assembly; A fourth sealing gasket is provided between the cylinder housing and the second end cover; The diameter of the piston is larger than the diameter of the valve core; The drive mechanism also includes a discharge nozzle connected to the cylinder housing. The discharge nozzle has an outlet that communicates with the piston chamber and is used to discharge the working medium that enters the piston chamber.

8. A rocket engine, characterized in that, Includes the relief valve according to any one of claims 1-7.

9. A rocket, characterized in that, Including the rocket engine as described in claim 8.

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