CN112728137B

CN112728137B - Stop valve, engine and rocket aircraft

Info

Publication number: CN112728137B
Application number: CN202110337031.6A
Authority: CN
Inventors: 刘兴睿; 张玺; 唐文; 熊宴斌
Original assignee: Beijing Interstellar Glory Technology Co Ltd; Beijing Star Glory Space Technology Co Ltd
Current assignee: Beijing Interstellar Glory Technology Co Ltd; Beijing Star Glory Space Technology Co Ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-07-09
Anticipated expiration: 2041-03-30
Also published as: CN112728137A

Abstract

The invention provides a stop valve, an engine and a rocket aircraft, which comprise: the material passing channel is suitable for conveying material liquid; the valve core cavity is communicated with the material passing channel, and is provided with a valve core assembly and a control assembly, wherein the valve core assembly comprises a first valve core and a second valve core; the first valve core is internally provided with a first elastic part which is abutted against the inner wall of the material passing channel under the action of the first elastic part and at least partially closes the flow limiting state of the material passing channel, and is arranged at intervals with the inner wall of the material passing channel and opens the communication state of the material passing channel; the second valve core is arranged adjacent to the first valve core and is provided with a second elastic part, and the second valve core is in a closed state of being abutted against the first valve core under the action of the second elastic part and completely closing the material passing channel and in an open state of partially opening the material passing channel; and the control assembly is connected with the first valve core and the second valve core and is suitable for adjusting the state change of the first valve core and the second valve core.

Description

Stop valve, engine and rocket aircraft

Technical Field

The invention relates to the technical field of aircrafts, in particular to a stop valve, an engine and a rocket system.

Background

The liquid rocket is a rocket with a liquid rocket engine as a power device, a chemical propellant used by the liquid rocket engine consists of fuel and an oxidant, and the chemical propellant needs to be introduced into a thrust chamber when working.

Nowadays, the opening and closing of the fuel and the oxidant into the thrust chamber are generally controlled by using stop valves, but the liquid rocket engine has high requirements on valve response time and action sensitivity, and needs to correspondingly control the flow of the fuel and the oxidant according to different stages, and the conventional stop valves in the prior art are difficult to realize.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the common stop valve in the prior art is difficult to effectively control the flow in different working stages, thereby providing the stop valve, the engine and the rocket system.

The present invention provides a stop valve, comprising: the material passing channel is suitable for conveying material liquid;

the valve core cavity is communicated with the material passing channel, and is provided with a valve core assembly and a control assembly, wherein the valve core assembly comprises a first valve core and a second valve core;

the first valve core is internally provided with a first elastic part which is in butt joint with the inner wall of the material passing channel under the action of the first elastic part and at least partially closes the flow limiting state of the material passing channel, and is arranged at intervals with the inner wall of the material passing channel and opens the communication state of the material passing channel;

the second valve core is arranged adjacent to the first valve core, a second elastic part is arranged on the second valve core, and the second valve core is in a closed state of abutting against the first valve core under the action of the second elastic part and completely closing the material passing channel and in an open state of partially opening the material passing channel;

the control assembly is connected with the first valve spool and the second valve spool and is suitable for adjusting the state change of the first valve spool and the second valve spool.

The first spool includes: the first valve head is arranged corresponding to the material transferring opening in the material passing channel, is suitable for being in sealing butt joint with the material transferring opening in the current limiting state, and is provided with a material passing opening;

a valve housing connected to the first valve head and having the first elastic member built therein;

and the valve gap is arranged between the first valve head and the valve shell and is communicated with the material passing port and the material passing channel.

And a third sealing element is arranged on the first valve head, and a first abutting bulge is arranged on one side of the material transferring opening facing the valve core cavity and is suitable for being in sealing abutting joint with the third sealing element in a current limiting state.

Valve casing is including holding the chamber and crossing the core hole, cross core hole intercommunication the valve gap with hold the chamber, it is close to hold the chamber be provided with first spacing step on one side inner wall of valve gap, first spacing step with first elastic component butt, first elastic component is suitable for to be followed the extending direction of valve casing is used in on the first spacing step.

The second valve spool includes: the second valve head is arranged in the valve gap, is abutted against the first valve head in the closed state, is suitable for plugging the material passing port, is arranged at a distance from the first valve head in the opening state and is suitable for opening the material passing port;

and the valve rod is connected with the second valve head, is at least partially arranged in the accommodating cavity and penetrates through a core passing hole arranged on the valve shell, and is provided with the second elastic piece which is suitable for moving along the length direction under the action of the second elastic piece.

The first valve head is back to one side of material transferring opening is provided with the second butt arch, the second valve head orientation one side of first valve head is provided with the butt portion, the butt portion be suitable for under the closed condition with second butt arch sealing connection.

The valve rod is provided with the spacing step of second along week side, the spacing step setting of second is in hold the intracavity, and with the butt of second elastic component, the second elastic component is suitable for to follow the extending direction of valve rod is used in on the spacing step of second.

The valve casing orientation be provided with the holding tank on one side outer wall of first valve head, the holding tank is suitable for and holds the second valve head to shelter from the setting and be in on the holding tank cross the core hole.

The valve core assembly further comprises a limiting seat, wherein the limiting seat is arranged at one end, back to the first valve head, of the valve casing and is suitable for containing and limiting the first elastic piece and the second elastic piece.

The control assembly includes: the pressure control assembly comprises a control cover and a piston piece, the control cover is arranged on the valve core cavity and comprises a power part and a control cavity, at least part of the piston piece is arranged in the valve core cavity, one end of the piston piece is connected with the valve core assembly, and the other end of the piston piece extends into the control cavity and is suitable for driving the valve core assembly to move under the action of the power part;

and the sealing assembly is arranged on the peripheral side of the piston piece, is fixed with the valve core cavity and is suitable for isolating the valve core cavity from the control cavity.

The power part is a pneumatic control port arranged on the control cavity, and the pneumatic control port is suitable for introducing or discharging high-pressure gas.

The piston spare orientation one end week side in control chamber is provided with the spacing step of third to the registrate is fixed with first sealing member and fastener, first sealing member with the inner wall butt in control chamber, the fastener is suitable for spacingly first sealing member.

The fastener is a fastening nut and is arranged on one side, back to the third limiting step, of the first sealing element.

The sealing assembly comprises a sealing end, the sealing end is fixedly connected with the valve core cavity and the control cover, movably connected with the piston piece and suitable for being in movable sealing with the piston piece, and the side wall of the sealing end is abutted against the limiting seat and suitable for limiting the first valve core.

The inner wall of the sealing end facing the piston piece is provided with a plurality of sealing grooves, and second sealing pieces are correspondingly arranged in the sealing grooves.

The sealing end is provided with a leakage flow channel, one end of the leakage flow channel is arranged on the inner wall of the piston piece, which faces the sealing end, and is arranged between the adjacent sealing grooves, and the other end of the leakage flow channel protrudes out of the sealing end, which faces away from the outer wall of the piston piece, and is suitable for being communicated with the outside.

The material passing channel is arranged in a bending mode, a material rotating port is arranged at the bending position, the valve core cavity is arranged opposite to the material rotating port, and the valve core assembly is suitable for shielding or opening the material rotating port under the action of the control assembly.

The invention provides an engine, which comprises the stop valve.

The invention provides a rocket aircraft, which comprises the engine.

The technical scheme of the invention has the following advantages:

1. the invention provides a stop valve, comprising: the material passing channel is suitable for conveying material liquid; the valve core cavity is communicated with the material passing channel, and is provided with a valve core assembly and a control assembly, wherein the valve core assembly comprises a first valve core and a second valve core; the first valve core is internally provided with a first elastic part which is in butt joint with the inner wall of the material passing channel under the action of the first elastic part and at least partially closes the flow limiting state of the material passing channel, and is arranged at intervals with the inner wall of the material passing channel and opens the communication state of the material passing channel; the second valve core is arranged adjacent to the first valve core, a second elastic part is arranged on the second valve core, and the second valve core is in a closed state of abutting against the first valve core under the action of the second elastic part and completely closing the material passing channel and in an open state of partially opening the material passing channel; the control assembly is connected with the first valve spool and the second valve spool and is suitable for adjusting the state change of the first valve spool and the second valve spool.

Through setting up the first case and the second case of built-in elastic component, can adjust the different states of first case and second case through control assembly on the one hand, make the punishment in advance passageway can be opened at the part, open completely and switching under the closure state, make the stop valve can realize effectively adjusting to the flow in the punishment in advance passageway, on the other hand, owing to built-in elastic component, the case subassembly can flow the pressure size to the case subassembly according to the punishment in advance passageway, the realization is adjusted the correspondence of case subassembly open mode, the effect of supplementary regulation has been played control assembly, both guaranteed the instantaneity and the sensitivity of regulation, can carry out effective control according to different working phases again to the material flow.

In order to prevent the engine assembly from being failed due to the problems of explosion and the like in the ignition stage of the thrust chamber, the mixing ratio of fuel and oxidant entering the thrust chamber in the starting stage needs to be effectively controlled, in the starting stage of the engine, the stop valve controls the initial flow, the material passing channel is in a partially opened state, the material flow passing through the stop valve is increased along with the working condition of an engine system, the pressure on the valve core assembly is increased, the rated flow is gradually reached, and the stop valve is in a fully opened state.

2. According to the stop valve provided by the invention, the outer wall of one side, facing the first valve head, of the valve casing is provided with the accommodating groove, and the accommodating groove is suitable for accommodating the second valve head and shielding the core passing hole formed in the accommodating groove.

Through setting up the holding tank, can be at the current-limiting state of first case, under the open mode of second case, accomodate the second valve head and block up the core hole to with valve gap vacant, the guide material flows in the discharging channel of expecting the passageway along the valve gap, avoids the material stream to flow in from crossing the core hole and holds the intracavity, improves the guide efficiency to the material stream.

3. According to the stop valve provided by the invention, the power part is an air control port arranged on the control cavity, and the air control port is suitable for introducing or discharging high-pressure gas.

The power part is set to be an air control port, and the closing thrust to the valve core assembly is provided in a mode of introducing high-pressure air into the control cavity, so that the second valve core and the first valve core are quickly closed. Meanwhile, the external force provided by the mode can be continuously and rapidly supplied in a short time and is greater than the pushing-off and frictional resistance of the material to the valve core assembly, so that the stop valve can realize the function of high-pressure reliable closing when needed, and the purpose of rapidly cutting off the supply of fuel and oxidant in the pushing-off chamber is achieved.

4. According to the stop valve provided by the invention, the sealing end is provided with a plurality of sealing grooves towards the inner wall of the piston piece, and second sealing pieces are correspondingly arranged in the sealing grooves.

Through set up the seal groove of a plurality of built-in second sealing members on the sealed end towards piston spare direction, can realize the multiple activity of sealed end and piston spare sealed, effectively keep apart case chamber and control chamber.

5. According to the stop valve provided by the invention, the sealing end is provided with the drainage channel, one end of the drainage channel is arranged on the inner wall of the sealing end facing the piston piece and is arranged between the adjacent sealing grooves, and the other end of the drainage channel protrudes out of the outer wall of the sealing end back to the piston piece and is suitable for being communicated with the outside.

In the working process, after the material flow in the material passing channel enters the valve core cavity, a trace amount of material flow possibly passes through the sealing groove provided with the second sealing element, and the material flow can be guided out by arranging the material flow channel, so that the sealing reliability is further improved, and the material flow is prevented from entering the control cavity.

6. According to the stop valve provided by the invention, the material passing channel is arranged in a bent shape, the material rotating port is arranged at the bent position, the valve core cavity is arranged opposite to the material rotating port, and the valve core assembly is suitable for shielding or opening the material rotating port under the action of the control assembly.

The material passing channel is bent, and the material transferring port is arranged at the bent position, so that the valve core assembly in the valve core cavity controls the telescopic motion of different valve cores through the telescopic motion of the elastic piece, the valve core assembly is arranged to control the opening and closing or opening and closing degree of the material transferring port, the structure is simple, and the realization is easy; in addition, because case chamber and commentaries on classics material mouth set up relatively for case subassembly and material stream are just to setting up, are convenient for carry out the auxiliary regulation to the flow of punishment in advance passageway through material stream pressure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of the internal structure of a shut-off valve provided in an embodiment of the present invention;

description of reference numerals:

1-a material passing channel; 11-transferring the material port; 111-a first abutment projection; 2-valve core cavity; 31-a first valve head; 311-a material passing port; 312 — a third seal; 313-a second abutment projection; 32-a valve housing; 321-a first elastic member; 322-a receiving cavity; 323-core hole; 324-a first limit step; 325-accommodating groove; 33-valve clearance; 41-a second valve head; 411-an abutment; 42-a valve stem; 421-a second limit step; 43-a second elastic member; 5-a limiting seat; 6-a piston member; 61-a third limiting step; 62-a first seal; 63-fasteners; 7-controlling the cover; 71-a control chamber; 72-air control port; 8-sealing the end; 81-sealing groove; 82-a second seal; 83-the vent path.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, the present embodiment provides a shutoff valve including: the material passing channel 1, the valve core cavity 2, the valve core assembly and the control assembly.

The material passing channel 1 is used for conveying material liquid, in the embodiment, the material passing channel 1 is continuously bent and arranged, and comprises a feeding channel and a discharging channel which are communicated, and a material rotating port 11 is arranged on one side of a bent part close to the feeding channel. The valve core cavity 2 is arranged opposite to the material transferring port 11, and the valve core assembly is suitable for shielding or opening the material transferring port 11 under the action of the control assembly.

The material passing channel 1 is bent, the material transferring port 11 is arranged at the bent position, and the valve core assembly in the valve core cavity 2 controls the telescopic motion of different valve cores through the telescopic motion of the elastic part, so that the valve core assembly is arranged to control the opening and closing or opening and closing degree of the material transferring port 11, the structure is simple, and the realization is easy; in addition, because case chamber 2 sets up with changeing material mouth 11 relatively for case subassembly and material stream just set up, are convenient for carry out the auxiliary regulation to the flow of punishment in advance passageway 1 through material stream pressure.

The valve core cavity 2 is communicated with the lateral side of the discharging channel in a cylindrical shape and is arranged opposite to the material transferring port 11, a control assembly is arranged at one end of the valve core cavity 2 along the direction back to the material transferring port 11, a valve core assembly is arranged in the valve core cavity 2, the valve core assembly can be opened, shielded or partially shielded under the action of the control assembly and comprises a first valve core and a second valve core.

The first valve body has a first elastic member 321 therein, and has a restricted flow state and a communication state. In a flow limiting state, the first valve core is abutted against the inner wall of the material passing channel 1 on the peripheral side of the material transferring port 11 under the action of the first elastic element 321, and the material transferring port 11 on the material passing channel 1 can be partially closed or completely closed; in a communicated state, the first valve core and the inner wall of the material passing channel 1 on the peripheral side of the material transferring port 11 are arranged at intervals, and the material transferring port 11 on the material passing channel 1 is opened.

The second valve core is arranged adjacent to the first valve core, a second elastic part 43 is arranged on the second valve core, the second valve core has a closed state and an open state, and in the closed state, the second valve core is abutted against the first valve core in a current-limiting state under the action of the second elastic part 43 and completely closes the material transferring port 11 on the material passing channel 1; in the open state, the second valve core can partially open the material transfer opening 11 on the material passing channel 1 under the pressure of the material flow when the first valve core is in the flow limiting state. In addition, the second valve core can also move along with the first valve core in the communication state and completely open the transfer port 11.

The control assembly is connected with the first valve core and the second valve core and is suitable for adjusting the first valve core to be switched between a flow limiting state and a communication state and also can control the second valve core to be switched between a closed state and an open state.

Through setting up the first case and the second case of built-in elastic component, can adjust the different states of first case and second case through control assembly on the one hand, make punishment in advance passageway 1 can be opened at the part, open completely and switching under the closure state, make the stop valve realize effective regulation to the flow in punishment in advance passageway 1, on the other hand, owing to built-in elastic component, the case subassembly can flow the pressure size to the case subassembly according to punishment in advance passageway 1, the realization is adjusted the correspondence of case subassembly open mode, the effect of auxiliary regulation has been played control assembly, the instantaneity and the sensitivity of regulation have both been guaranteed, can carry out effective control to the material flow according to different working stages again.

In order to prevent the engine assembly from being failed due to the problems of explosion and the like in the ignition stage of the thrust chamber, the mixing ratio of fuel and oxidant entering the thrust chamber in the starting stage needs to be effectively controlled, in the starting stage of the engine, the stop valve controls the initial flow, the material passing channel 1 is in a partially opened state, the material flow passing through the stop valve is increased along with the working condition of an engine system, the pressure on the valve core assembly is increased, the rated flow is gradually reached, and the stop valve is in a fully opened state.

In the present embodiment, the first valve spool is disposed in the spool chamber 2 in a columnar shape, and includes a first valve head 31, a valve housing 32, and a valve gap 33.

Wherein first valve head 31 is cylindricly, change material mouthful 11 setting towards in the material passageway 1 of passing, the middle part of crossing the axis is provided with material mouthful 311, first valve head 31 external diameter is greater than and changes material mouthful 11 internal diameter, be convenient for accomplish the shutoff to material mouthful 11, first valve head 31 is provided with third sealing member 312 towards the one side of changing material mouthful 11, change the first butt arch 111 that the edge of material mouthful 11 one side towards case chamber 2 was provided with, first butt arch 111 seals the butt with third sealing member 312 under the current-limiting state, in this embodiment, third sealing member 312 diameter is greater than and changes material mouthful 11 diameter, and be elastic rubber seal, also can change into other material seal structures according to the kind of transported substance stream, such as polytetrafluoroethylene or modified polytetrafluoroethylene material etc., in addition, first butt arch 111 all is the annular setting and the diameter is the same with third sealing member 312. The third sealing member 312, the material passing opening 311 and the material transferring opening 11 are coaxially arranged.

As an alternative embodiment, the first abutting projection 111 may not be provided, and the third sealing member 312 protruding from the first valve head 31 seals the material transferring port 11, and as another alternative embodiment, a plurality of sets of the first abutting projection 111 and the third sealing member 312 may be provided according to different diameters, so as to realize multiple sealing and improve the stability of the sealing effect.

The valve housing 32 of the first valve core is disposed in a barrel shape, extends into the valve core cavity 2, is connected with the first valve head 31, and is internally provided with a first elastic member 321. In this embodiment, the valve housing 32 is integrally formed with the first valve head 31, and may be welded or adhesively fixed.

In this embodiment, the valve housing 32 includes an accommodating cavity 322 and a core hole 323, the core hole 323 communicates the valve gap 33 and the accommodating cavity 322, a first limit step 324 is disposed on an inner wall of the accommodating cavity 322 on a side close to the valve gap 33, one end of the first elastic member 321 abuts against the first limit step 324, and the first elastic member 321 is adapted to act on the first limit step 324 along an extending direction of the valve housing 32.

The valve gap 33 is an overflow gap arranged between the first valve head 31 and the valve housing 32, and the valve gap 33 may be fan-shaped, cylindrical or other shapes, and is only required to be communicated with the material passing port 311 and the material passing channel 1. In the present exemplary embodiment, the valve gap 33 is a channel which is arranged in the same direction as the outlet channel and passes through the center axis of the first valve element.

The second spool includes a second valve head 41 and a stem 42.

A second valve head 41 which is inserted through the core hole 323, is disposed in the valve gap 33, abuts against the first valve head 31 in a closed state, and closes the feed opening 311, and is disposed at a distance from the first valve head 31 in an open state, and can open the feed opening 311;

the valve stem 42, a part of which is disposed in the receiving cavity 322, and another part of which passes through a core hole 323 disposed on the valve housing 32, is fixedly connected to the second valve head 41, and in this embodiment, the valve stem 42 and the second valve head 41 are integrally formed, and may be fixedly connected by an adhesive or a welded pipe as an alternative embodiment. A second elastic member 43 is provided along the circumferential side of the valve stem 42, and the valve stem 42 is adapted to move in the longitudinal direction by the second elastic member 43.

In this embodiment, a side of the first valve head 31 facing away from the material transferring port 11 is provided with a second abutting protrusion 313, the second abutting protrusion 313 is annularly provided at an end of the material passing port 311, a side of the second valve head 41 facing the first valve head 31 is provided with a groove-shaped abutting portion 411, and the abutting portion 411 is adapted to be in sealing connection with the second abutting protrusion 313 in a closed state. Further, the second abutment projection 313 and the grounding portion are provided with abutment slopes that cooperate with each other.

The valve rod 42 is provided with a second limit step 421 along the peripheral side, the second limit step 421 is arranged in the accommodating cavity 322 and is abutted with the second elastic element 43, and the second elastic element 43 is suitable for acting on the second limit step 421 along the extending direction of the valve rod 42. In the present embodiment, the second limiting step 421 and the first limiting step 324 protrude from each other.

An outer wall of the valve housing 32 on a side facing the first valve head 31 is provided with a receiving groove 325, and the receiving groove 325 is adapted to receive the second valve head 41 and shield the through-core hole 323 provided on the receiving groove 325. Through setting up holding tank 325, can accomodate second valve head 41 and block up through core hole 323 under the current-limiting state of first case, the open mode of second case to with valve gap 33 vacant, guide material stream flows into in the discharging channel of material channel 1 along valve gap 33, avoids the material stream to flow into in holding chamber 322 from crossing core hole 323, improves the guide efficiency to the material stream. In the embodiment, the extension length of the receiving groove 325 in the direction of the valve rod 42 is H1, and the extension length can be adjusted as required to partially control the flow guiding space size of the valve gap 33.

The valve core assembly further comprises a limiting seat 5, the limiting seat 5 is arranged at one end, back to the first valve head 31, of the valve casing 32 and is suitable for containing and limiting the first elastic piece 321 and the second elastic piece 43, in the embodiment, the limiting seat 5 is arranged in the containing cavity 322 and sleeved on the valve rod 42, one end of the limiting seat is abutted to the control assembly, the other end of the limiting seat is provided with a groove body and a step for limiting the first elastic piece 321 and the second elastic piece 43, and the limiting seat can be respectively matched with the first limiting step 324 and the second limiting step 421.

In this embodiment, the first elastic member 321 and the second elastic member 43 are springs, and as an alternative embodiment, the first elastic member 321 and the second elastic member 43 may be a silicone member or an elastic member made of other materials.

In this embodiment, the control assembly includes a pressure control assembly and a sealing assembly.

The pressure control assembly comprises a control cover 7 and a piston piece 6, the control cover 7 is arranged on the valve core cavity 2 and comprises a power part and a control cavity 71, one end of the piston piece 6 is connected with the valve rod 42 on the valve core assembly and extends into the valve core cavity 2, and the other end of the piston piece extends into the control cavity 71 and is suitable for driving the valve core assembly to move under the action of the power part. In this embodiment, the power part is an air control port 72 disposed in the middle of the control chamber 71, the air control port 72 is adapted to introduce or discharge high-pressure air, and one side of the piston member 6 facing the air control port 72 is provided with a deep groove. Alternatively, the power unit may be an electrical control, such as a push rod, hydraulic rod, or electric motor.

The power part is set as a pneumatic control port 72, and the closing thrust to the valve core assembly is provided by introducing high-pressure gas into the control cavity 71, so that the second valve core and the first valve core are quickly closed. Meanwhile, the external force provided by the mode can be continuously and rapidly supplied in a short time and is greater than the pushing-off and frictional resistance of the material to the valve core assembly, so that the stop valve can realize the function of high-pressure reliable closing when needed, and the purpose of rapidly cutting off the supply of fuel and oxidant in the pushing-off chamber is achieved.

The sealing assembly is arranged on the peripheral side of the piston member 6, is fixed with the valve core cavity 2 and is suitable for isolating the valve core cavity 2 from the control cavity 71. In this embodiment, relative movement between the seal assembly and the piston member 6 is possible whilst ensuring a seal.

In the present embodiment, a third limit step 61 is provided on one end peripheral side of the piston member 6 facing the control chamber 71, and a first seal member 62 and a fastening member 63 are fixed in a nested manner, the first seal member 62 abuts against an inner wall of the control chamber 71, and the fastening member 63 is adapted to limit the first seal member 62. Specifically, the fastening member 63 is a fastening nut and is disposed on a side of the first sealing member 62 facing away from the third limiting step 61. Alternatively, the fastener 63 may be a silicone or other removable seal.

The sealing assembly comprises a sealing end 8 extending along the circumferential direction of the piston piece 6, the sealing end 8 is fixedly connected with the valve core cavity 2 and the control cover 7, is movably connected with the piston piece 6 and is suitable for being in movable sealing with the piston piece 6, and the side wall of the sealing end 8 is abutted against the limiting seat 5 and is suitable for limiting the first valve core. The inner wall of the sealing end 8 facing the piston element 6 is provided with a plurality of sealing grooves 81, and a second sealing element 82 is correspondingly arranged in the sealing grooves 81. By arranging a plurality of sealing grooves 81 with built-in second sealing elements 82 on the sealing end 8 towards the piston element 6, multiple movable sealing of the sealing end 8 and the piston element 6 can be realized, and the valve core cavity 2 and the control cavity 71 are effectively isolated. In addition, sealed end 8 is H2 with valve casing 32 interval, can adjust according to actual need, and then corresponds the biggest adjustment range of adjusting valve core subassembly to punishment in advance passageway 1.

In this embodiment, the first sealing element 62 and the second sealing element 82 are also elastic rubber sealing rings, and may be changed to sealing structures made of other materials according to the type of the conveying material flow, such as teflon or modified teflon, and the shapes thereof may be adapted to the third limiting step 61 and the sealing groove 81 respectively.

The sealing end 8 is provided with a drainage channel 83, one end of the drainage channel 83 is arranged on the inner wall of the sealing end 8 facing the piston member 6 and arranged between the adjacent sealing grooves 81, and the other end thereof protrudes out of the outer wall of the sealing end 8 facing away from the piston member 6 and is communicated with the outside. In the working process, after the material flow in the material passing channel 1 enters the valve core cavity 2, a trace amount of material flow may pass through the sealing groove 81 provided with the second sealing element 82, and by arranging the material flow channel, the material flow can be led out, so that the sealing reliability is further improved, and the material flow is prevented from entering the control cavity 71.

The embodiment also provides an engine comprising the stop valve.

The embodiment also provides a rocket aircraft comprising the engine.

The working process is as follows:

during the starting phase of the engine, the stop valve controls the initial flow of the material, when the pressure of the material flow at the material transfer opening 11 is smaller and the pressure of the first valve head 31 is smaller, the pressure of the second valve head 41 pushes the valve rod 42 to move in the direction towards the control cover 7, and the passage between the material passing opening 311 and the valve gap 33 is opened, and the material flow flows to the material discharging passage from the passage.

Along with the working condition of an engine auxiliary system climbing, the medium passing through the stop valve is required to gradually reach the rated flow, the pressure of the material flow at the material transferring port 11 is increased, the first valve core and the second valve core are pushed to move towards the control cover 7 simultaneously, the material passing channel 1 is completely opened, and the stop valve reaches the full-open state.

When the engine needs to be shut down quickly, high-pressure gas is introduced into the position of the air control port 72, so that the pressure of the control cavity 71 on the piston member 6 is greater than the material flow pressure received by the valve core assembly, the valve core assembly is pushed back to the material transfer port 11 quickly and is blocked in a sealing manner, and material flow supply is cut off quickly.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims

1. A shut-off valve, comprising:

the material passing channel (1) is suitable for conveying material liquid;

the valve core cavity (2) is communicated with the material passing channel (1), and is provided with a valve core assembly and a control assembly, wherein the valve core assembly comprises a first valve core and a second valve core;

the first valve core is internally provided with a first elastic part (321), and has a flow limiting state which is abutted against the inner wall of the material passing channel (1) under the action of the first elastic part (321) and at least partially closes the material passing channel (1), and a communication state which is arranged at intervals with the inner wall of the material passing channel (1) and opens the material passing channel (1);

the second valve core is arranged adjacent to the first valve core, a second elastic part (43) is arranged on the second valve core, and the second valve core is in a closed state of abutting against the first valve core under the action of the second elastic part (43) and completely closing the material passing channel (1) and in an open state of partially opening the material passing channel (1);

the control assembly is connected with the first valve spool and the second valve spool and is suitable for adjusting the state change of the first valve spool and the second valve spool;

the first spool includes:

the first valve head (31) is arranged corresponding to the material transferring opening (11) in the material passing channel (1), is suitable for being in sealing butt joint with the material transferring opening (11) in the flow limiting state, and is provided with a material passing opening (311);

a valve housing (32) connected to the first valve head (31) and having the first elastic member (321) incorporated therein;

the valve gap (33) is arranged between the first valve head (31) and the valve shell (32) and is communicated with the material passing port (311) and the material passing channel (1);

the valve core assembly further comprises a limiting seat (5), wherein the limiting seat (5) is arranged at one end, facing away from the first valve head (31), of the valve casing (32) and is suitable for accommodating and limiting the first elastic piece (321) and the second elastic piece (43).

2. The shut-off valve according to claim 1, characterized in that a third sealing member (312) is arranged on the first valve head (31), and a first abutment projection (111) is arranged on a side of the transfer port (11) facing the spool chamber (2) and adapted to be in sealing abutment with the third sealing member (312) in the flow-restricted state.

3. A stop valve according to claim 1 or 2, wherein the valve housing (32) comprises a receiving cavity (322) and a core hole (323), the core hole (323) communicating the valve gap (33) with the receiving cavity (322), a first limit step (324) is provided on an inner wall of the receiving cavity (322) on a side close to the valve gap (33), the first limit step (324) abutting the first resilient member (321), the first resilient member (321) being adapted to act on the first limit step (324) in an extending direction of the valve housing (32).

4. The shut-off valve of claim 3, wherein the second spool comprises:

the second valve head (41) is arranged in the valve gap (33), abuts against the first valve head (31) in the closed state and is suitable for sealing the feed opening (311), and is arranged at a distance from the first valve head (31) in the open state and is suitable for opening the feed opening (311);

and the valve rod (42) is connected with the second valve head (41), is at least partially arranged in the accommodating cavity (322), passes through a core passing hole (323) formed in the valve shell (32), is provided with the second elastic piece (43) and is suitable for moving in the length direction under the action of the second elastic piece (43).

5. The shut-off valve according to claim 4, characterized in that a side of the first valve head (31) facing away from the transfer opening (11) is provided with a second abutment protrusion (313), and a side of the second valve head (41) facing the first valve head (31) is provided with an abutment portion (411), the abutment portion (411) being adapted to sealingly connect with the second abutment protrusion (313) in the closed state.

6. A stop valve according to claim 4 or 5, wherein the valve stem (42) is peripherally provided with a second stop step (421), the second stop step (421) being arranged in the housing cavity (322) and being in abutment with the second elastic element (43), the second elastic element (43) being adapted to act on the second stop step (421) in the direction of extension of the valve stem (42).

7. A shut-off valve according to claim 4 or 5, wherein the valve housing (32) is provided with a receiving groove (325) in an outer wall of a side thereof facing the first valve head (31), the receiving groove (325) being adapted to receive the second valve head (41) and to shield the core passing hole (323) provided in the receiving groove (325).

8. A shut-off valve as claimed in claim 4 or 5, characterised in that the control assembly comprises:

the pressure control assembly comprises a control cover (7) and a piston piece (6), the control cover (7) is arranged on the valve core cavity (2) and comprises a power part and a control cavity (71), the piston piece (6) is at least partially arranged in the valve core cavity (2), one end of the piston piece is connected with the valve core assembly, the other end of the piston piece extends into the control cavity (71), and the piston piece is suitable for driving the valve core assembly to move under the action of the power part;

and the sealing assembly is arranged on the peripheral side of the piston piece (6), is fixed with the valve core cavity (2) and is suitable for isolating the valve core cavity (2) from the control cavity (71).

9. The shut-off valve according to claim 8, characterized in that the power part is a pneumatic control port (72) arranged on the control chamber (71), the pneumatic control port (72) being adapted to let in or let out high-pressure gas.

10. A stop valve according to claim 8, wherein the piston member (6) is provided with a third stop step (61) on one end periphery side facing the control chamber (71), and is fitted and fixed with a first sealing member (62) and a fastening member (63), the first sealing member (62) is abutted against the inner wall of the control chamber (71), and the fastening member (63) is adapted to stop the first sealing member (62).

11. A shut-off valve according to claim 10, characterised in that the fastening element (63) is a fastening nut arranged on the side of the first sealing element (62) facing away from the third limit step (61).

12. A stop valve according to claim 8, characterized in that the sealing assembly comprises a sealing end (8), the sealing end (8) fixedly connecting the spool chamber (2) and the control cover (7) and being movably connected with the piston member (6) and adapted to be in movable sealing with the piston member (6), the side wall of the sealing end (8) abutting the retainer seat (5) and adapted to retain the first spool.

13. A shut-off valve according to claim 12, characterized in that the sealing end (8) is provided with a number of sealing grooves (81) towards the inner wall of the piston member (6), and that a second sealing member (82) is correspondingly provided in the sealing grooves (81).

14. A shut-off valve according to claim 13, characterised in that the sealing end (8) is provided with a leakage channel (83), the leakage channel (83) being provided at one end on the inner wall of the sealing end (8) facing the piston member (6) and between adjacent sealing grooves (81), and at the other end protruding from the outer wall of the sealing end (8) facing away from the piston member (6) and being adapted to communicate with the outside.

15. The stop valve according to claim 1, characterized in that the material passing channel (1) is bent, a material transferring opening (11) is arranged at the bent position, the valve core cavity (2) is arranged opposite to the material transferring opening (11), and the valve core assembly is suitable for shielding or opening the material transferring opening (11) under the action of the control assembly.

16. An engine comprising a shut-off valve as claimed in any one of claims 1 to 15.

17. A rocket vehicle comprising the engine of claim 16.