CN111636979B - Switch and flow regulating valve for liquid oxygen main circuit of pump pressure variable thrust liquid rocket engine - Google Patents
Switch and flow regulating valve for liquid oxygen main circuit of pump pressure variable thrust liquid rocket engine Download PDFInfo
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- CN111636979B CN111636979B CN202010512872.1A CN202010512872A CN111636979B CN 111636979 B CN111636979 B CN 111636979B CN 202010512872 A CN202010512872 A CN 202010512872A CN 111636979 B CN111636979 B CN 111636979B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/56—Control
- F02K9/58—Propellant feed valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/46—Feeding propellants using pumps
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Abstract
The invention discloses a switch and a flow regulating valve for a liquid oxygen main circuit of a pump pressure variable thrust liquid rocket engine, a valve body comprises a first cavity and a second cavity which are communicated, the communicated part of the first cavity and the second cavity is communicated with a third cavity, a valve seat is fixed in the first cavity, the rack sleeve is sleeved on the valve seat in an axial moving way, the gear shaft is meshed with the rack sleeve and is used for driving the rack sleeve to move in the axial direction, the motor is connected with the gear shaft, the rack sleeve is provided with a second through hole communicated with the first through hole on the valve seat, the guide sleeve is fixed in the second cavity, the guide cylinder is axially moved and is internally arranged in the guide sleeve, the cover plate seals the second cavity, a closed inner cavity formed by the cover plate and the guide cylinder is a pneumatic control cavity, a pneumatic control port is formed in the cover plate, one end of the valve core is fixedly connected with the guide cylinder, and the other end of the valve core is aligned with the end part of the rack sleeve and is matched with the first through hole for use. The control of liquid oxygen flow during the starting, the main stage and the shutdown of the pump pressure type variable thrust liquid rocket engine and the thrust regulation can be realized.
Description
Technical Field
The invention relates to the technical field of starting, main stage, shutdown and mixing ratio control of a pump pressure type variable thrust low-temperature liquid rocket engine, in particular to a switch and a flow regulating valve for a liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine.
Background
With the increasing year by year exploration of space activities by human beings, the importance of developing a variable thrust propulsion technology becomes more and more obvious. The pump pressure type variable thrust liquid rocket engine technology has become an important development direction of the liquid rocket propelling technology at present. The power device of the space transportation system adopts a variable thrust engine, and can realize optimal thrust control, so that the carrying capacity is maximized. The variable thrust technology has wide application prospect in future military and civil spacecrafts, and particularly, hot spots pursued by countries in recent years can be used for recovering rockets, such as Space-X falcon rockets. The Space-X falcon rocket is successfully vertically recycled by a first-stage power system for the first time in the world, and the recycling technology of the orbit carrier rocket is verified, wherein the key technology is that the rocket engine has the thrust depth adjusting capability.
The variable thrust rocket engine is a rocket engine with adjustable thrust in a large range, and the variable thrust ratio reaches 5:1 or even higher. The development of the variable thrust technology can greatly improve the space propulsion technical level of China, break through the bottleneck of the propulsion technology and reduce the gap with the foreign advanced technical level.
The variable thrust rocket engine works under different thrusts, the mixing ratio of the engine can be changed, and in order to control the mixing ratio of the engine within a reasonable range and ensure the reliable work of the engine, the flow of an oxidant path needs to be adjusted.
At present, pump pressure type liquid rocket engines in domestic use do not have the depth variable thrust capability, and a main valve of an oxidant passage mostly adopts a pneumatic control switch valve and does not have the flow regulation function.
Therefore, the technical problem to be solved by those skilled in the art is how to provide a switch and a flow regulating valve for a liquid oxygen main circuit of a pump pressure variable thrust liquid rocket engine to realize the control of liquid oxygen flow during the starting, main stage, shutdown and thrust regulation of the pump pressure variable thrust liquid rocket engine.
Disclosure of Invention
In view of the above, the present invention is directed to a switch and a flow regulating valve for a liquid oxygen main of a pump pressure variable thrust liquid rocket engine, so as to control the liquid oxygen flow during the starting, main stage, shutdown and thrust regulation of the pump pressure variable thrust liquid rocket engine.
In order to achieve the purpose, the invention provides the following technical scheme:
a switch and a flow regulating valve for a liquid oxygen main circuit of a pump pressure variable thrust liquid rocket engine comprise a valve body, a valve seat, a valve core, a rack sleeve, a gear shaft, a motor, a guide cylinder, a guide sleeve and a cover plate, wherein,
a three-way cavity is arranged in the valve body and comprises a first cavity and a second cavity which are communicated, a third cavity is also communicated at the communication position of the first cavity and the second cavity, the port side of the first cavity is an inlet, the port side of the third cavity is an outlet,
the valve seat is fixed in the first cavity, the rack sleeve is sleeved on the valve seat in an axially moving manner, the gear shaft is meshed with the rack sleeve and used for driving the rack sleeve to move axially, the motor is connected with the gear shaft,
the rack sleeve is provided with a second through hole communicated with the first through hole on the valve seat,
the guide sleeve is fixed in the second cavity, the guide cylinder is axially arranged in the guide sleeve in a moving way, the cover plate seals the port of the second cavity, the closed inner cavity formed by the cover plate and the guide cylinder is a pneumatic control cavity, the cover plate is provided with a pneumatic control port,
one end of the valve core is fixedly connected with the guide cylinder, and the other end of the valve core is aligned with the end part of the rack sleeve and is matched with the first through hole for use;
when the switch for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine and the flow regulating valve are in a closed state, the valve core is in sealing fit with the first through hole, and the medium in the first through hole cannot enter the third cavity from the first cavity;
the air control port is deflated, the valve core moves towards the guide sleeve under the pressure of the medium in the first through hole, so that the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure-variable thrust liquid rocket engine are in an open state,
the motor drives the rack sleeve to move axially through the gear shaft, and the flow is adjusted through the extending length of the rack sleeve.
Preferably, the second through hole is provided at an end of the rack sleeve, and a flow rate is adjusted by a distance between the second through hole and the valve body,
when the second through hole is closest to the valve core, the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine are in a state of minimum flow area,
when the second through hole is farthest away from the valve core, the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine are in the state of the largest flow area.
Preferably, the second through hole is provided in the rack sleeve wall.
Preferably, the second through hole includes an end through hole provided in the rack sleeve and a cylindrical wall through hole provided in a cylindrical wall of the rack sleeve.
Preferably, the sealing surfaces at the two ends of the valve core are embedded with non-metal sealing material blocks.
Preferably, an annular sealing groove is formed in the inner hole wall of the guide sleeve, and a first universal plug sealing ring is arranged in the annular sealing groove.
Preferably, an elastic device is arranged in the pneumatic control cavity, one end of the elastic device props against the inner wall of the guide cylinder, and the other end of the elastic device is fixed on the cover plate.
Preferably, a plurality of sliding bosses are arranged on the circumferential outer wall of the valve seat.
Preferably, a plurality of bosses are arranged on the circumferential outer wall of the rack sleeve,
one of the bosses is provided with a tooth surface for being meshed with the gear shaft,
wherein two axisymmetric bosses are arranged in the grooves on the inner wall surface of the valve body to limit the circumferential rotation of the rack sleeve,
one boss is matched with a clamping table on the inner wall surface of the valve body to limit the axial moving distance of the rack sleeve.
Preferably, one side of the gear surface part on the gear shaft, which is close to the motor, is arranged on the valve body through a first bearing, one side of the gear surface part on the gear shaft, which is far from the motor, is arranged on the valve body through a second bearing,
a second universal plug sealing ring is arranged on one side of the first bearing, which is far away from the upper tooth surface part of the gear shaft, a third universal plug sealing ring is arranged on one side of the second bearing, which is far away from the upper tooth surface part of the gear shaft,
the second is general to be filled in the sealing washer and is kept away from one side of the last flank of gear shaft has set gradually first spacing ring, first nut and lock nut, the general stopper sealing washer of third is kept away from one side of the last flank of gear shaft has set gradually second spacing ring, second nut and lock nut.
The invention provides a switch and a flow regulating valve for a liquid oxygen main circuit of a pump pressure variable thrust liquid rocket engine, which comprises a valve body, a valve seat, a valve core, a rack sleeve, a gear shaft, a motor, a guide cylinder, a guide sleeve and a cover plate, wherein,
a three-way cavity is arranged in the valve body and comprises a first cavity and a second cavity which are communicated, a third cavity is also communicated at the communication position of the first cavity and the second cavity, the port side of the first cavity is an inlet, the port side of the third cavity is an outlet,
the valve seat is fixed in the first cavity, the rack sleeve is sleeved on the valve seat in an axially moving manner, the gear shaft is meshed with the rack sleeve and used for driving the rack sleeve to move axially, the motor is connected with the gear shaft,
the rack sleeve is provided with a second through hole communicated with the first through hole on the valve seat,
the guide sleeve is fixed in the second cavity, the guide cylinder is axially arranged in the guide sleeve in a moving way, the cover plate seals the port of the second cavity, the closed inner cavity formed by the cover plate and the guide cylinder is a pneumatic control cavity, the cover plate is provided with a pneumatic control port,
one end of the valve core is fixedly connected with the guide cylinder, and the other end of the valve core is aligned with the end part of the rack sleeve and is matched with the first through hole for use;
when the switch for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine and the flow regulating valve are in a closed state, the valve core is in sealing fit with the first through hole, and the medium in the first through hole cannot enter the third cavity from the first cavity;
the air control port is deflated, the valve core moves towards the guide sleeve under the pressure of the medium in the first through hole, so that the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure-variable thrust liquid rocket engine are in an open state,
the motor drives the rack sleeve to move axially through the gear shaft, and the flow is adjusted through the extending length of the rack sleeve.
When in use, as shown in figure 1, the valve core is pressed on the valve seat to keep sealing. The rack sleeve is located at the leftmost end. Before the engine is started, the air control port is communicated with control air, and the pressure of the control air enables the valve core to be pressed on the valve seat more tightly, so that reliable sealing is ensured.
When the engine is ready to start, the gear shaft is driven to rotate by the motor, the rack sleeve is driven to move rightwards to the maximum position through the meshing of the gear shaft and the rack on the rack sleeve, then the air control port is exhausted, the valve core is rapidly opened under the action of inlet medium pressure, the medium entering from the inlet of the first through hole flows out from the outlet of the third cavity through the second through hole and fills the medium into a downstream combustion chamber, at the moment, the state of the valve is shown in figure 7, the valve is in the state of the minimum flow area, the right end face of the valve core is tightly pressed on the guide sleeve to keep sealing, and the higher the medium pressure is, the higher the sealing force is.
After the engine is ignited and started, the rack sleeve is driven by the motor through the gear shaft to move leftwards to the leftmost end, so that the opening degree of the valve is gradually increased from minimum to maximum, as shown in a fully-opened state of the valve in fig. 8, and the valve in the working section of the main-level rated working condition of the engine is maintained in the fully-opened state. The opening degree of the valve is gradually increased from the minimum during the starting process of the engine, so that the starting stability is better facilitated, and a downstream combustion chamber is protected.
In the process of changing the thrust of the engine, along with the reduction of the thrust, the mixing ratio of the engine changes, at the moment, a preset program is used for giving an instruction to the motor to drive the rack sleeve to axially move through the gear shaft by the motor, the opening of the valve is adjusted, the flow is adjusted, the mixing ratio of the engine is controlled within a reasonable range, and the valve is in an intermediate state between the minimum opening and the maximum opening at the moment, as shown in fig. 9.
When the engine is shut down, along with the reduction of the pressure of inlet media, when the valve needs to be closed, control air is introduced into the air control port, the guide cylinder and the valve core move leftwards together under the action of the air control force, finally the valve core is pressed on the valve seat again and kept sealed, then the motor drives the rack sleeve to move to the leftmost end, and the valve is restored to the state shown in fig. 1.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine can realize the control of the liquid oxygen flow during the starting, the main stage and the shutdown of the pump pressure variable thrust liquid rocket engine and the thrust regulation.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a switch and a flow regulating valve for a liquid oxygen main circuit of a pump pressure variable thrust liquid rocket engine according to an embodiment of the present invention;
FIG. 2 is a schematic sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of a valve body according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a rack sleeve according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a gear shaft provided in an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a valve seat provided by an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a liquid oxygen main switch and a flow regulating valve of a pump pressure variable thrust liquid rocket engine according to an embodiment of the present invention in a minimum opening state;
FIG. 8 is a schematic structural diagram of a maximum opening state of a switch and a flow regulating valve for a liquid oxygen main of a pump pressure variable thrust liquid rocket engine according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of the opening adjustment state of the switch and the flow rate adjustment valve for the liquid oxygen main of the pump pressure variable thrust liquid rocket engine according to the embodiment of the present invention.
In the above FIGS. 1-9:
the valve comprises a valve body 1, a valve seat 2, a valve core 3, an inlet flange 4, a pin 5, a guide cylinder 6, a guide sleeve 7, a first pan plug sealing ring 8, a spring 9, a cover plate 10, a rack sleeve 11, a gear shaft 12, a first graphite sealing gasket 13, a second graphite sealing gasket 14, a first bearing 15, a second bearing 16, a second pan plug sealing ring 17, a third pan plug sealing ring 18, a first limit ring 19, a first nut 20, a lock nut 21, a second limit ring 22, a second nut 23, a lock nut 24, a movable sealing sleeve 25, a motor connecting shaft 26, a motor butt flange 27, a sealing gasket 28, an accommodating cavity 29, a rack groove 30, a groove 31, a clamping table 32, a tooth surface 33, a boss 34 and a boss 35 which are symmetrical to each other in axis, a tooth surface part 36, a sliding boss 37, a first through hole 38 and a second through hole 39.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
Referring to fig. 1 to 9, fig. 1 is a schematic structural diagram of a switch and a flow regulating valve for a liquid oxygen main of a pump pressure variable thrust liquid rocket engine according to an embodiment of the present invention; FIG. 2 is a schematic sectional view A-A of FIG. 1; FIG. 3 is a schematic structural diagram of a valve body according to an embodiment of the present invention; fig. 4 is a schematic structural view of a rack sleeve according to an embodiment of the present invention; FIG. 5 is a schematic structural view of a gear shaft provided in an embodiment of the present invention; FIG. 6 is a schematic structural diagram of a valve seat provided by an embodiment of the present invention; FIG. 7 is a schematic structural diagram of a liquid oxygen main switch and a flow regulating valve of a pump pressure variable thrust liquid rocket engine according to an embodiment of the present invention in a minimum opening state; FIG. 8 is a schematic structural diagram of a maximum opening state of a switch and a flow regulating valve for a liquid oxygen main of a pump pressure variable thrust liquid rocket engine according to an embodiment of the present invention; fig. 9 is a schematic structural diagram of the opening adjustment state of the switch and the flow rate adjustment valve for the liquid oxygen main of the pump pressure variable thrust liquid rocket engine according to the embodiment of the present invention.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine provided by the embodiment of the invention comprise a valve body 1, a valve seat 2, a valve core 3, a rack sleeve 11, a gear shaft 12, a motor, a guide cylinder 6, a guide sleeve 7 and a cover plate 10, wherein,
a three-way cavity is arranged in the valve body 1 and comprises a first cavity and a second cavity which are communicated, a third cavity is also communicated at the communication position of the first cavity and the second cavity, the port side of the first cavity is an inlet, the port side of the third cavity is an outlet,
the valve seat 2 is fixed in the first cavity, the rack sleeve 11 is sleeved on the valve seat 2 in an axial moving manner, the gear shaft 12 is meshed with the rack sleeve 11 to drive the rack sleeve 11 to move in the axial direction, the motor is connected with the gear shaft 12, specifically, one end of the gear shaft 12 is provided with a motor connecting shaft 26,
the rack sleeve 11 is provided with a second through hole 39 communicated with the first through hole 38 on the valve seat 2,
the guide sleeve 7 is fixed in the second cavity, the guide cylinder 6 is axially arranged in the guide sleeve 7, the cover plate 10 seals the port of the second cavity, the closed inner cavity formed by the cover plate 10 and the guide cylinder 6 is a pneumatic control cavity, the cover plate 10 is provided with a pneumatic control port,
one end of the valve core 3 is fixedly connected with the guide cylinder 6, and the other end of the valve core is aligned with the end part of the rack sleeve 11 and is matched with the first through hole 38 for use;
when the switch for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine and the flow regulating valve are in a closed state, as shown in fig. 1, the valve core 3 is sealed and attached to the first through hole 38, and the medium in the first through hole 38 cannot enter the third cavity from the first cavity;
the air control port is deflated, the valve core 3 moves towards the guide sleeve 7 under the pressure of the medium in the first through hole, so that the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure-variable thrust liquid rocket engine are in an open state,
the motor drives the rack sleeve 11 to move axially through the gear shaft 12, and the flow is adjusted through the extending length of the rack sleeve 11.
When in use, as shown in fig. 1, the valve core 3 is pressed on the valve seat 2 to keep sealing. The rack sleeve 11 is located at the leftmost end. Before the engine is started, the air control port is communicated with control air, and the pressure of the control air enables the valve core 3 to be pressed on the valve seat 2 more tightly, so that reliable sealing is ensured.
When the engine is ready to start, firstly, the gear shaft 12 is driven to rotate by the motor, the rack sleeve 11 is driven to move rightwards to the maximum position through the meshing of the gear shaft 12 and a rack on the rack sleeve 11, then an air control port is exhausted, then the valve core 3 is rapidly opened under the action of inlet medium pressure, a medium entering from an inlet of the first through hole 38 flows out from an outlet of the third cavity through the second through hole 39 and fills a medium into a downstream combustion chamber, at the moment, the valve is in a state of the minimum flow area as shown in fig. 7, the right end face of the valve core 3 is pressed on the guide sleeve 7 to maintain sealing, and the higher the medium pressure is, the higher the sealing force is.
After the engine is ignited and started, the rack sleeve 11 is driven by the motor through the gear shaft 12 to move leftwards to the leftmost end, so that the opening degree of the valve is gradually increased from minimum to maximum, as shown in a fully-opened state of the valve in fig. 8, and the valve in the working section of the main-level rated working condition of the engine is maintained in the fully-opened state. The opening degree of the valve is gradually increased from the minimum during the starting process of the engine, so that the starting stability is better facilitated, and a downstream combustion chamber is protected.
In the process of changing the thrust of the engine, along with the reduction of the thrust, the mixing ratio of the engine changes, at the moment, a preset program is used for giving an instruction to the motor, the rack sleeve 11 is driven by the motor through the gear shaft 12 to move axially, the opening of the valve is adjusted, the flow is adjusted, the mixing ratio of the engine is controlled within a reasonable range, and at the moment, the valve is in an intermediate state between the minimum opening and the maximum opening, as shown in fig. 9.
When the engine is shut down, along with the reduction of the pressure of inlet media, when the valve needs to be closed, control air is introduced into the air control port, the guide cylinder 6 and the valve core 3 move leftwards together under the action of the air control force, finally the valve core 3 is pressed on the valve seat 2 again and keeps sealed, then the motor drives the rack sleeve 11 to move to the leftmost end, and the valve is restored to the state shown in fig. 1.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine can realize the control of the liquid oxygen flow during the starting, the main stage and the shutdown of the pump pressure variable thrust liquid rocket engine and the thrust regulation.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine are an adjustable valve integrating gas collection control and electric regulation, have the advantages of simple regulation and reliable work, and are used for controlling the flow of an oxidant during the thrust regulation of the variable thrust liquid rocket engine so as to control the mixing ratio of the engine.
The liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine provided by the embodiment of the invention is a combined valve comprising a pneumatic control main valve part and an electric adjusting mechanism part, and not only inherits the advantages of sealing and reliable work of a pneumatic control valve, but also realizes electric continuous adjustment. The method is applied to various stages of starting, main stage and shutdown of the variable thrust liquid rocket engine and control of the mixing ratio.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine, provided by the embodiment of the invention, apply the electric regulating technology to the valves of the domestic low-temperature liquid rocket engine for the first time, and fill the blank of the domestic low-temperature electric regulating valve of the liquid rocket engine. The temperature of the motor is basically not influenced by a low-temperature medium through a heat insulation measure.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine provided by the embodiment of the invention have an integrated structure, so that the overall layout of the rocket engine is facilitated, and the layout and the structure of the whole pipeline are simpler.
The embodiment of the invention provides a switch and a flow regulating valve for a liquid oxygen main circuit of a pumping pressure variable thrust liquid rocket engine, and relates to the technologies of starting, main stage, shutdown and mixing ratio control of the pumping pressure variable thrust low-temperature liquid rocket engine. In particular to a switch and a flow regulating valve for a liquid oxygen main path of a pumping pressure type variable thrust cryogenic liquid rocket engine, which integrates pneumatic control and electric regulation.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine are applied to a liquid oxygen methane engine in the aerospace field, multiple complete machine depth variable thrust hot test runs are completed at present, the variable thrust ratio is up to 5:1, the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine provided by the embodiment of the invention are adopted as an oxidant main valve, and the adjustable valve integrating gas collection control and electric regulation is used for controlling the liquid oxygen flow when the engine changes thrust.
The switch and the flow regulating valve for the liquid oxygen main line of the pump pressure variable thrust liquid rocket engine are a control technology of the mixing ratio of the variable thrust liquid rocket engine in China during thrust regulation, and provide an adjustable valve integrating pneumatic control and electric regulation.
In the first embodiment, the second through hole 39 is provided at the end of the rack sleeve 11, and as shown in fig. 7, the flow rate is adjusted by the distance between the second through hole 39 and the valve element 3, when the second through hole 39 is closest to the valve element 3, the switch and the flow rate adjustment valve for the liquid oxygen main of the pump variable thrust liquid rocket engine are in the minimum flow area state, and when the second through hole 39 is farthest from the valve element 3, the switch and the flow rate adjustment valve for the liquid oxygen main of the pump variable thrust liquid rocket engine are in the maximum flow area state. The change in the projecting length of the rack sleeve 11 is the change in the distance between the second through hole 39 and the spool 3.
In the second embodiment, the second through hole 39 is provided in the cylinder wall of the rack sleeve 11. That is, a plurality of second through holes 39 or a large-area second through hole 39 is formed in the cylinder wall of the rack sleeve 11, and the change of the extension length of the rack sleeve 11 is the change of the exposed area or the exposed number of the second through holes 39 in the cylinder wall, which is communicated with the third cavity, so as to adjust the flow rate.
In the third embodiment, the second through hole 39 includes an end through hole provided in the rack sleeve 11 and a cylindrical wall through hole provided in the cylindrical wall of the rack sleeve 11, i.e., a combination of the first embodiment and the second embodiment.
In order to further optimize the scheme, nonmetal sealing material blocks are embedded on the sealing surfaces at the two ends of the valve core 3. To improve the sealing effect. Specifically, a non-metal sealing material block may be provided at a contact portion between the valve element 3 and the valve seat 2 and a contact portion between the valve element and the guide sleeve 7.
In order to further optimize the scheme, an annular sealing groove is formed in the inner hole wall of the guide sleeve 7, and a first universal plug sealing ring 8 is arranged in the annular sealing groove. To improve the sealing effect. Utilize general stopper sealing washer to replace traditional bellows to regard as the movive seal of ultra-low temperature high pressure medium, solved in the high pressure heavy-calibre valve movive seal receive the restriction of the bellows development degree of difficulty, experiment proves that general stopper sealing washer is sealed respond well.
In order to further optimize the scheme, an elastic device is arranged in the air control cavity, one end of the elastic device props against the inner wall of the guide cylinder 6, and the other end of the elastic device is fixed on the cover plate 10. The elastic device can be a spring 9, the spring force compresses the guide cylinder 6, so that the valve core 3 is pressed on the valve seat 2, the spring force provides certain sealing force, and the buffering and vibration reduction effects are achieved when the valve is opened.
In order to further optimize the above solution, a plurality of sliding bosses 37 are provided on the circumferential outer wall of the valve seat 2. The rack sleeve 11 is slidably disposed on the sliding boss 37 to reduce the contact area of the moving member.
In order to further optimize the scheme, a plurality of bosses are arranged on the circumferential outer wall of the rack sleeve 11, a tooth surface 33 is formed on one boss and is used for being meshed with the gear shaft 12, two bosses 34 which are symmetrical in axial direction are arranged in the grooves 31 on the inner wall surface of the valve body 1 to limit the circumferential rotation of the rack sleeve 11 and ensure that the rack sleeve 11 moves along the axial direction, and one boss 35 is matched with the clamping table 32 on the inner wall surface of the valve body to limit the axial movement distance of the rack sleeve 11. A rack groove 30 for moving the rack of the rack sleeve 11 is formed on an inner wall surface of the valve body 4, that is, an inner wall surface of the first cavity.
In order to further optimize the scheme, as shown in fig. 2, a side of the gear surface portion 36 on the gear shaft 12, which is close to the motor, is arranged on the valve body 1 through a first bearing 15, a side of the gear surface portion 36 on the gear shaft 12, which is far away from the motor, is arranged on the valve body 1 through a second bearing 16, a side of the first bearing 15, which is far away from the gear surface portion 36 on the gear shaft 12, is provided with a second flood plug sealing ring 17, a side of the second bearing 16, which is far away from the gear surface portion 36 on the gear shaft 12, is provided with a third flood plug sealing ring 18, a side of the second flood plug sealing ring 17, which is far away from the gear surface portion 36 on the gear shaft 12, is sequentially provided with a first limit ring 19, a first nut 20 and a lock nut 21, and a side of the third flood. The supporting effect, the sealing effect and the fixing effect are better.
The embodiment of the invention provides a switch and a flow regulating valve for a liquid oxygen main circuit of a pump pressure variable thrust liquid rocket engine, wherein:
the valve is integrally of a pneumatic control mushroom valve structure with a flood plug sealing ring for dynamic sealing, and the opening degree of the valve is adjusted through the movement of the rack sleeve 11. The valve body can be divided into two major parts, a pneumatic control main valve part and an electric adjusting mechanism part. The main air-controlled valve is controlled by one-way control gas, which closes the valve and keeps sealing, and opens the valve by medium force of the valve inlet after removing the control gas. The electric adjusting part changes the valve opening degree by means of the movement of a rack sleeve 11 arranged at the valve inlet to realize flow adjustment, a motor drives a gear shaft 12 to rotate, and the linear motion of the rack sleeve 11 along the valve core 3 opening degree direction is realized by the rack meshing transmission of the gear shaft 12 and the rack sleeve 11. The valve body 1 is provided with a receiving cavity 29 for receiving the gear shaft 12.
The valve core 3 is embedded in a metal matrix by adopting a non-metal sealing material through hot pressing to form an integral structure, and then is processed and molded, and the non-metal material is used for internal sealing. Non-metal materials are inlaid in the planes on two sides of the valve core 3, and the valve core and the valve seat 2 and the guide sleeve 7 form sealing respectively in a closed state and an open state, the inlet medium is blocked by the sealing in the closed state to flow to a channel of an outlet, and the high-pressure medium is blocked by the sealing in the open state to enter a large-flooding plug sealing ring, so that the auxiliary dynamic sealing effect is achieved. The valve core 3 is provided with a connecting hole which is assembled with a connecting hole on the guide cylinder 6 in a centering way, and the valve core 3 and the guide cylinder 6 are connected into a whole through a pin 5. The valve core 3 is in clearance fit with the guide cylinder 6, so that the valve core 3 has certain movement amount, and sealing is facilitated.
The guide cylinder 6 and the guide sleeve 7 are both cylindrical structures, the valve core 3 and the guide cylinder 6 are connected into a whole and are arranged in the guide sleeve 7, and the guide sleeve 7 is arranged in the valve body 1 and is pressed and fixed by the valve body 1 and a flange cover, namely a cover plate 10.
And one end of the guide sleeve 7, which is close to the valve core 3, is subjected to finish machining on the molded surface of the valve seat, and the non-metal end surface of the opened valve core 3 is pressed on the molded surface of the valve seat of the guide sleeve 7 to form sealing. In order to reduce the moving contact area of the guide cylinder 6 and the guide sleeve 7, an annular groove is processed in the middle section of the guide sleeve 7. The stopper sealing washer that floods greatly, first stopper sealing washer 8 that floods is installed in the ring channel that guide cylinder 6 and uide bushing 7 formed as low temperature dynamic seal to utilize the blind flange, apron 10 shelters from the ring channel promptly, extrude the stopper sealing washer that floods greatly when preventing guide cylinder 6 to move. The closed inner cavity formed by the flange cover and the guide cylinder 6 is a pneumatic control cavity of the valve, the flange cover is provided with a vent hole, namely a pneumatic control port, after ventilation, gas enters the pneumatic control cavity, and the valve is closed by the pressure of the gas and provides sealing force.
The spring 9 is arranged between the guide cylinder 6 and the flange cover, the guide cylinder 6 is pressed by spring force, so that the valve core 3 is pressed on the valve seat 2, certain sealing force is provided by the spring force, and the buffer and vibration reduction effects are achieved when the valve is opened. The valve seat 2 is arranged in the valve body 1, the valve body 1 and the inlet flange 4 are pressed and fixed, the outer circular surface of the valve seat 2 is matched with the rack sleeve 11, and four bosses are arranged on the outer circular surface of the valve seat 2 to reduce the contact area of the moving part.
The rack sleeve 11 is a key part for adjusting the opening of the valve, and is integrally of a cylindrical structure, four bosses are arranged on the outer circumferential surface, one of the bosses is processed into a rack and is in meshed transmission with the gear shaft 12, two symmetrically arranged bosses, namely two bosses 34 with symmetrical axes are arranged in the corresponding grooves 31 of the valve body 1 to play a role in limiting rotation, and the other boss is an axial displacement limiting table and is matched with the valve body 1 to play a role in limiting axial displacement. One end of the rack sleeve 11 is annularly and uniformly distributed with a plurality of small holes, namely cylinder wall through holes, as circulation holes of the medium. The rack sleeve 11 is mounted on the valve seat 2, and the inner circular surface of the rack sleeve is matched with four sliding bosses 37 on the outer surface of the valve seat 2 for guiding movement.
The gear shaft 12 is a key part for realizing transmission, and the gear shaft 12 is an integral long rod shaft with a gear at the middle section, and the gear on the rod shaft is meshed with the rack of the rack sleeve 11 for transmission. The two ends of the gear shaft 12 close to the gear are respectively provided with bearings for positioning, one side of the bearing is arranged between the valve body 1 and the gear shaft 12, the other side of the bearing is arranged between the movable sealing sleeve 25 and the gear shaft 12, and the outer sides of the bearings at the two ends are respectively provided with a small universal plug sealing ring, namely a second universal plug sealing ring 17 and a third universal plug sealing ring 18 are used for rotary sealing to prevent the medium from leaking outwards. The second flood plug sealing ring 17 is arranged between the valve body 1 and the gear shaft 12, is limited by the first limiting ring 19, is compressed by an inner nut, namely a first nut 20, and is locked by an inner locking nut, namely a locking nut 21; the third flood plug sealing ring 18 is arranged between the movable sealing sleeve 25 and the gear shaft 12, is limited by the second limiting ring 22, is compressed by a nut, namely a second nut 23, and is locked by a locking nut 24; one end of the gear shaft 12 is processed into a square shaft as a motor connecting shaft 26 to be connected with a motor shaft, the motor is connected with the valve body 1 through a motor butt flange 27, and a plastic heat insulation pad is added between the motor and the motor butt flange 27 of the valve body to prevent excessive heat conduction. The axial force on the gear shaft 12 is balanced, and the driving torque of the motor only needs to overcome the friction torque of the flooding plug sealing ring.
The valve body 1, the inlet flange 4, the flange cover and the motor flange are connected pairwise by adopting studs and self-locking nuts, threaded holes are processed in the inlet and outlet flange faces of the valve body 1 and the inlet flange 4, and the studs are embedded in the flange faces of the valve body 1 and the inlet flange 4, so that butt joint of the valve, an engine pipeline and a combustion chamber is realized. The static seal adopts a graphite sealing gasket and an aluminum gasket, and the sealing gasket is arranged in the sealing groove and is tightly pressed by flange connection or thread connection.
The embodiment of the invention provides a switch and a flow regulating valve for a liquid oxygen main path of a pump pressure variable thrust liquid rocket engine, which are used for the switch and the flow regulating valve of an oxidant main path of the pump pressure variable thrust liquid rocket engine. Wherein:
the valve body 1 carries and serves as a mounting base for the internal parts, the structure of which is shown in fig. 3. The upper end of the inlet of the valve body 1 is provided with a rack groove 30, the left side and the right side of the inlet are symmetrically provided with two rotary limiting grooves, namely a groove 31, and the lower end of the inlet is provided with an axial limiting boss, namely a clamping table 32. The rack groove 30 is used for placing a rack of the rack sleeve 11, the width of the rack groove 30 is larger than that of the rack on the rack sleeve 11, and a larger gap is reserved between the rack groove 30 and the rack; the rotation limiting grooves are matched with the two rotation limiting tables of the rack sleeve 11 in a tight fit manner, so that the rack sleeve 11 is prevented from rotating; the axial limiting table restrains the axial displacement of the rack sleeve 11, and the transmission assembly mounting shell is perpendicular to the inlet axis and used for mounting the transmission assembly. The inlet and outlet flanges of the valve body 1 are provided with threaded holes for mounting the stud bolts.
The rack sleeve 11 is a moving part for controlling the flow of the valve, and the valve opening is changed through the axial movement of the rack sleeve 11, so that the flow of the valve is adjusted. The structure of the rack sleeve 11 is shown in fig. 4 and is a cylindrical structure, and four bosses which are respectively a rack, two symmetrically arranged rotation limiting tables and an axial displacement limiting table at the lower end are annularly and uniformly distributed on the outer circle surface. The rack sleeve 11 is arranged in the valve body 1, and the rotary limiting table is placed in a rotary limiting groove of the valve body 1 to prevent the rack sleeve 11 from rotating; the rack is placed in the rack groove 30 of the valve body 1, the axial displacement limiting table is matched with the axial limiting table, namely the clamping table 32, so that the axial displacement of the rack sleeve 11 is restrained, and when the rack sleeve 11 moves to the maximum displacement, the axial limiting table on the rack sleeve is contacted with the axial limiting table of the valve body 1. A plurality of small holes are uniformly distributed at a port at one side of the rack sleeve 11 along the circumferential direction and are used for completely blocking the circulation of a medium when the valve core is opened.
The gear shaft 12 is an important transmission member and is integrally machined and formed, and the structure is shown in figure 5. The middle section of the gear shaft 12 is a gear, the end of one side is a square shaft, the gear is meshed with the rack of the rack sleeve 11 for transmission, and the square shaft is used for connecting a shaft of a motor. As shown in fig. 2, the gear shaft 12 is mounted in the valve body 1 and positioned by two bearings, and the static seal between the dynamic seal housing 25 and the valve body 1 is sealed by a seal gasket 28. Two small plug sealing rings are arranged in two annular cavities between the gear shaft 12 and the valve body 1 and between the gear shaft and the movable sealing sleeve 25 and are used for rotating and sealing to prevent a medium from leaking outwards. The small-flooding plug sealing ring is shielded by a limiting ring and prevented from dropping off, and the limiting rings on two sides are respectively compressed by a nut and a locking nut. The two small universal plug sealing rings have the same size, and the high-pressure medium pressure on the gear shaft 12 is balanced.
The structure of the valve seat 2 is shown in fig. 6, and is a cylindrical structure, four guide bosses, namely sliding bosses 37, are uniformly distributed on the outer circular surface in an annular manner, the guide bosses are matched with the inner hole of the rack sleeve 11 for guiding, and the purpose of guiding by the four bosses is to reduce the contact area of a moving part and reduce the abrasion between the moving part and the rack sleeve in the moving process. The valve seat 2 is arranged at the inlet of the valve body 1 and is pressed against the valve body 1 by the inlet flange 4. The inlet flange 4 is connected with the valve body 1 through a double-end stud and a nut.
Non-metallic material is inlayed in the equal hot pressing of case 3 both sides, forms sealedly with disk seat 2 and uide bushing 7 respectively in closed state and open mode, and the sealed passageway of blocking the medium flow direction export of closed state, and the sealed high-pressure medium of blocking of open mode gets into and fills up the sealing washer greatly, plays the effect of supplementary dynamic seal. The valve core 3 is provided with a connecting hole which is assembled with a connecting hole on the guide cylinder 6 in a centering way, the valve core 3 and the guide cylinder 6 are connected into a whole through the pin 5, and the tail part of the impact pin 5 is flared and locked. The valve core 3 is in clearance fit with the guide cylinder 6, and the valve core 3 has certain movement amount, thereby being beneficial to sealing. The valve core 3 and the guide cylinder 6 are connected into a whole and then are arranged in the guide sleeve 7, the guide cylinder 6 and the guide sleeve 7 are matched for movement guide, and an annular groove is processed in the middle of the guide sleeve 7 for reducing the contact area of a moving part. An annular groove between the guide cylinder 6 and the guide sleeve 7 is used for installing a large-flooding plug sealing ring which is used for dynamic sealing during axial movement of the guide cylinder 6.
The flange cover is connected with the valve body 1 through bolts, a closed cavity is formed by the flange cover and the guide cylinder 6, the guide sleeve 7 and the second graphite sealing gasket 14 are compressed, the flange cover is provided with a ventilation nozzle, and the valve is closed and opened by ventilating and deflating the cavity formed by the flange cover and the guide cylinder 6 through the nozzle. The flange cover also plays a role in limiting the axial movement of the large-flooding plug sealing ring, and the large-flooding plug sealing ring is prevented from being extruded when the guide cylinder 6 moves.
The spring 9 is arranged between the guide cylinder 6 and the flange cover, and the spring force is transmitted to the valve core 3 through the guide cylinder 6, so that the valve core 3 is pressed on the valve seat 2, and the spring force provides a certain sealing force.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine provided by the embodiment of the invention have the working principles that:
fig. 1 shows the valve in an assembled state, in which the valve element 3 is pressed against the valve seat 2 by the spring force of the spring 9, and the seal is maintained. The rack sleeve 11 is located at the leftmost end, the left end face being in contact with the valve seat 2. Before the engine is started, the air control port is communicated with control air, and the pressure of the control air enables the valve core 3 to be pressed on the valve seat 2 more tightly, so that reliable sealing is ensured.
When an engine is ready to start, firstly, the gear shaft 12 is driven to rotate by the motor, the rack sleeve 11 is driven to move rightwards to the maximum position through the meshing of the gear shaft 12 and the rack, namely the contact position of the rack sleeve 11 and the axial limiting table of the valve body 1, then the air control port is exhausted, then the valve core 3 overcomes the spring force and the friction force of the large-flooding plug dynamic sealing ring under the action of the pressure of inlet medium to be rapidly opened, the medium is filled into a downstream combustion chamber from an outlet, at the moment, the state of the valve is shown in figure 7, the valve is in the state of the minimum flow area, the right end face of the valve core 3 is tightly pressed on the guide sleeve 7 to maintain sealing, high-pressure medium is prevented from entering the large-flooding plug dynamic. The inlet medium flows to the downstream combustion chamber through the hole on the rack sleeve 11 and the clearance between the rack sleeve 11 and the valve core 3, and fills the oxygen head cavity of the combustion chamber.
After the engine is ignited and started, the rack sleeve 11 is driven by the motor through the gear shaft 12 to move leftwards to the leftmost end, so that the opening degree of the valve is gradually increased from minimum to maximum, as shown in a fully-opened state of the valve in fig. 8, and the valve in the working section of the main-level rated working condition of the engine is maintained in the fully-opened state. The opening degree of the valve is gradually increased from the minimum during the starting process of the engine, so that the starting stability is better facilitated, and a downstream combustion chamber is protected.
In the process of changing the thrust of the engine, along with the reduction of the thrust, the mixing ratio of the engine changes, at the moment, a preset program is used for sending a command to the motor, the motor drives the rack sleeve 11 to axially move through the gear shaft 12, the opening of the valve is adjusted, the mixing ratio of the engine is controlled within a reasonable range, and the valve is in an intermediate state between the minimum opening and the maximum opening at the moment, as shown in fig. 9.
When the engine is shut down, along with the reduction of the pressure of inlet media, when the valve needs to be closed, control air is introduced into the air control port, the guide cylinder 6 and the valve core 3 move leftwards together under the action of air control force and spring force, finally the valve core 3 is pressed on the valve seat 2 again and keeps sealing, then the motor drives the rack sleeve 11 to move to the leftmost end, and the valve is restored to the state shown in fig. 1.
The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine provided by the embodiment of the invention have the following installation processes:
before assembly, the valve core 3 and the guide cylinder 6 are connected together through the pin 5, and the tail of the pin 5 is impacted by a tool to enable the pin to be flared and locked. During assembly, the adjusting part of the valve is assembled firstly, and then the pneumatic control part is assembled. The specific assembly process is as follows:
installation of inlet component: referring to fig. 1, firstly, a rack sleeve 11 is sleeved on a valve seat 2, the rack sleeve and the valve seat are installed into a valve body 1 from an inlet end of the valve body 1, a rack, a rotary limiting table and an axial limiting table on the rack sleeve 11 are installed in alignment with corresponding positions of an inlet of the valve body 1, then the rack, the rotary limiting table and the axial limiting table are installed into an inlet flange 4, nuts at the position are symmetrically screwed after the inlet flange 4 is installed, and a first graphite sealing gasket 13 is installed into a corresponding sealing groove in advance.
Installation of a transmission assembly: referring to fig. 2, firstly, the first bearing 15 and the second bearing 16 are respectively installed in the valve body 1 and the movable sealing sleeve 25, the gear shaft 12 is installed from the right end to ensure that the gear shaft 12 is correctly meshed with the rack on the rack sleeve 11, the sealing gasket 28 and the movable sealing sleeve 25 are installed in the valve body 1, then the third universal plug sealing ring 18 is pressed into the annular grooves of the gear shaft 12 and the movable sealing sleeve 25 by a tool, then the limiting ring at the right end, namely the second limiting ring 22 is installed, and then the second nut 23 and the locking nut 24 are screwed. The second flood plug sealing ring 17 is pressed into the annular grooves of the valve body 1 and the gear shaft 12, then the limiting ring at the left end, namely the first limiting ring 19 is installed, and then the first nut 20 and the lock nut 21 are screwed. After the transmission assembly is installed, the gear shaft 12 is rotated by using a tool, the motion flexibility is checked, and after the check, the gear shaft 12 is rotated to enable the left end face of the rack sleeve 11 to be in contact with the valve seat 2.
Installation of the pneumatic control part: the assembly of the valve core 3 and the guide cylinder 6 is sleeved into the guide sleeve 7, the three are installed into the valve body 1 from the right end of the valve body 1 together, the first universal plug sealing ring 8 is pressed into annular grooves of the guide sleeve 7 and the guide cylinder 6 by utilizing a tool, the spring 9 is sleeved inside the guide cylinder 6, the flange cover is sleeved at the other end of the spring 9 and aligned with the valve body 1 and the flange cover, namely a bolt hole of the cover plate 10, the flange cover is slowly pressed into the annular grooves by utilizing a press machine, then nuts at the position are symmetrically screwed, and the second graphite sealing ring 14 is installed into the sealing groove in advance, so that the valve is assembled.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A switch and a flow regulating valve for a liquid oxygen main circuit of a pump pressure variable thrust liquid rocket engine are characterized by comprising a valve body (1), a valve seat (2), a valve core (3), a rack sleeve (11), a gear shaft (12), a motor, a guide cylinder (6), a guide sleeve (7) and a cover plate (10), wherein,
a three-way cavity is arranged in the valve body (1) and comprises a first cavity and a second cavity which are communicated, a third cavity is also communicated at the communication position of the first cavity and the second cavity, the port side of the first cavity is an inlet, the port side of the third cavity is an outlet,
the valve seat (2) is fixed in the first cavity, the rack sleeve (11) is sleeved on the valve seat (2) in an axial moving manner, the gear shaft (12) is meshed with the rack sleeve (11) and is used for driving the rack sleeve (11) to move in the axial direction, the motor is connected with the gear shaft (12),
a second through hole (39) communicated with the first through hole (38) on the valve seat is formed on the rack sleeve (11),
the guide sleeve (7) is fixed in the second cavity, the guide cylinder (6) is axially arranged in the guide sleeve (7), the cover plate (10) seals the port of the second cavity, a closed inner cavity formed by the cover plate (10) and the guide cylinder (6) is a pneumatic control cavity, a pneumatic control port is arranged on the cover plate (10),
one end of the valve core (3) is fixedly connected with the guide cylinder (6), and the other end of the valve core is aligned with the end part of the rack sleeve (11) and matched with the first through hole (38) for use;
when a switch for a liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine and a flow regulating valve are in a closed state, the valve core (3) is in sealing fit with the first through hole (38), and a medium in the first through hole (38) cannot enter the third cavity from the first cavity;
the air control port is deflated, the valve core (3) moves towards the guide sleeve (7) under the pressure of the medium in the first through hole (38), so that the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine are in an open state,
the motor drives the rack sleeve (11) to move axially through the gear shaft (12), and the flow is adjusted through the extending length of the rack sleeve (11).
2. The switch and flow rate control valve for the liquid oxygen main of a pump pressure-variable thrust liquid rocket engine according to claim 1, wherein the second through hole (39) is provided at an end of the rack sleeve (11), and the flow rate is adjusted by a distance between the second through hole (39) and the spool (3),
when the second through hole (39) is nearest to the valve core (3), the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine are in a state of minimum flow area,
when the second through hole (39) is farthest away from the valve core (3), the switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure variable thrust liquid rocket engine are in the state of the largest flow area.
3. The switch and flow control valve for the liquid oxygen main of a pump pressure-variable thrust liquid rocket engine according to claim 1, wherein the second through hole (39) is provided in the cylinder wall of the rack sleeve (11).
4. The switch and flow control valve for the liquid oxygen main of the pump pressure-variable thrust liquid rocket engine according to claim 1, wherein the second through hole (39) comprises an end through hole provided in the rack sleeve (11) and a cylindrical wall through hole provided in the cylindrical wall of the rack sleeve (11).
5. The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure-variable thrust liquid rocket engine according to claim 1, wherein non-metal sealing material blocks are embedded on the sealing surfaces at the two ends of the valve core (3).
6. The switch and the flow regulating valve for the liquid oxygen main of the pump pressure-variable thrust liquid rocket engine according to claim 1, wherein an annular sealing groove is formed in the inner hole wall of the guide sleeve (7), and a first flooding plug sealing ring (8) is arranged in the annular sealing groove.
7. The switch and the flow regulating valve for the liquid oxygen main circuit of the pump pressure-variable thrust liquid rocket engine according to claim 1, wherein an elastic device is arranged in the pneumatic control cavity, one end of the elastic device is propped against the inner wall of the guide cylinder (6), and the other end of the elastic device is fixed on the cover plate (10).
8. The switch and flow control valve for the liquid oxygen main of the pump pressure-variable thrust liquid rocket engine according to claim 1, wherein the valve seat (2) is provided with a plurality of sliding bosses (37) on the circumferential outer wall.
9. The switch and flow control valve for the liquid oxygen main of the pump pressure-variable thrust liquid rocket engine according to claim 1, wherein a plurality of bosses are provided on the circumferential outer wall of the rack sleeve (11),
one of the bosses is provided with a tooth surface (33) for being meshed with the gear shaft (12),
wherein two axisymmetric bosses (34) are arranged in a groove (31) on the inner wall surface of the valve body (1) to limit the circumferential rotation of the rack sleeve (11),
one boss (35) is matched with a clamping table (32) on the inner wall surface of the valve body (1) to limit the axial moving distance of the rack sleeve (11).
10. The switch and flow regulating valve for the liquid oxygen main of the pump pressure-variable thrust liquid rocket engine according to claim 1, wherein the side of the gear shaft (12) upper gear surface portion (36) close to the motor is arranged on the valve body (1) through a first bearing (15), and the side of the gear shaft (12) upper gear surface portion (36) far from the motor is arranged on the valve body (1) through a second bearing (16),
a second universal plug sealing ring (17) is arranged on one side, away from the upper tooth surface part (36) of the gear shaft (12), of the first bearing (15), a third universal plug sealing ring (18) is arranged on one side, away from the upper tooth surface part (36) of the gear shaft (12), of the second bearing (16),
keep away from general stopper sealing washer (17) of second one side of tooth face portion (36) has set gradually first spacing ring (19), first nut (20) and lock nut (21) on gear shaft (12), general stopper sealing washer (18) of third is kept away from one side of tooth face portion (36) has set gradually second spacing ring (22), second nut (23) and lock nut (24) on gear shaft (12).
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| CN202010512872.1A CN111636979B (en) | 2020-06-08 | 2020-06-08 | Switch and flow regulating valve for liquid oxygen main circuit of pump pressure variable thrust liquid rocket engine |
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| CN204493329U (en) * | 2015-03-02 | 2015-07-22 | 郑州宇通重工有限公司 | A kind of proportional hydraulic equilibrium valve |
| EP3153692A1 (en) * | 2015-10-09 | 2017-04-12 | Hamilton Sundstrand Corporation | Temperature adjusting valve, a turbine pump assembly and method of adjusting flow through a valve |
| CN205401879U (en) * | 2016-02-16 | 2016-07-27 | 江苏盈丰智能工程科技有限公司 | Rotation type variable frequency switching valve |
| CN109519304A (en) * | 2018-12-26 | 2019-03-26 | 北京星际荣耀空间科技有限公司 | Thrust regulating valve and rocket engine |
| CN109595098A (en) * | 2019-01-29 | 2019-04-09 | 九州云箭(北京)空间科技有限公司 | A kind of more degree adjustment valves of the mixing ratio of liquid-propellant rocket engine |
| CN210106640U (en) * | 2019-03-06 | 2020-02-21 | 北京星际荣耀空间科技有限公司 | Stepless regulating valve and liquid rocket |
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