CN212744175U - Pneumatic control structure of flow control valve and liquid rocket engine - Google Patents

Abstract

The utility model discloses a gas accuse structure and liquid rocket engine of flow control valve, contain casing and gas accuse device, the casing is inside to have along the first cavity and the second cavity of axial range, first cavity with the second cavity is through first trompil intercommunication, gas accuse device includes piston rod and fixed first piston and the second piston that sets up at this piston rod both ends, the piston rod sets up in airtight in the first trompil, the first piston along radial outside with the first cavity is sealed to be laminated, thereby first piston with the first cavity limits first and actuates the chamber, the second piston along radial outside with the second cavity is sealed to be laminated, thereby the second piston with the second cavity limits the second and actuates the chamber; the housing has a passage communicating the first actuating chamber and the second actuating chamber. The whole device has the advantages of simplifying the structure, reducing the weight, having stable structure and improving the sealing property.

Description

Pneumatic control structure of flow control valve and liquid rocket engine

Technical Field

The utility model relates to a liquid rocket field, in particular to gas accuse structure and liquid rocket engine of flow control valve.

Background

With the rapid development of the aerospace industry, all the technologies related to the rocket field also realize the rapid advance. The valve is an important part for realizing the starting and shutdown of the liquid rocket engine. The method is widely applied to propellant conveying systems and gas circuit control systems. When the engine works, the valve is influenced by the severe environment caused by the vibration condition of the engine, the pressure and the temperature of working medium, and the like, so that the valve is required to be reliable in sealing, flexible in action, resistant to low-temperature medium and light enough in weight in a high-pressure environment. The existing design special control valve capable of resisting ultralow temperature and high pressure is high in cost and complex in structure, and once the sealing effect of a sealing piece is poor, the problem that the control air cavity and the propellant working chamber are easy to leak mutually is solved, so that the function failure of the valve is caused.

This provides a flow valve device, and gas can get into different actuating chambers from the passageway, realizes the two way movement of piston at the casing, realizes the cooperation of piston and both sides structure, and this kind of gas accuse structure has the structure and simplifies, and weight reduction, stable in structure's advantage can improve the leakproofness of valve, guarantees the engine reliability.

Disclosure of Invention

An object of the utility model is to overcome prior art's not enough, provide a gas accuse structure and liquid rocket engine of flow control valve. The device has the advantages of simplified structure, light weight and stable structure, can improve the sealing property of the valve, and ensures the reliability of the engine.

In order to achieve the above object, the utility model provides a following technical scheme: an air control structure of a flow control valve comprises a shell and an air control device positioned in the shell, wherein,

the air control device comprises a piston rod and a first piston and a second piston which are fixedly arranged at two ends of the piston rod, the piston rod is arranged in the first opening in an airtight mode, the first piston is in sealing fit with the first cavity along the radial outer side, so that the first piston and the first cavity define a first actuating cavity, the second piston is in sealing fit with the second cavity along the radial outer side, and the second piston and the second cavity define a second actuating cavity;

the shell is provided with a channel which is communicated with the first actuating cavity and the second actuating cavity;

and gas enters the first actuating cavity or the second actuating cavity through the channel to drive the piston rod to move in two directions.

Further, the shell comprises an inner shell, an outer shell, a left plug cover and a right plug cover; a flow channel for medium circulation and penetrating through two ends of the flow channel is arranged in the outer shell along the axial direction; the interior casing is located in the shell, just interior casing is used for forming first cavity with the second cavity, the both ends of interior casing respectively with left side blanking cover with right side blanking cover is connected, a left side blanking cover is located one side of interior casing, right side blanking cover is located interior casing sets up the opposite side of a left side blanking cover.

Further, one side of left side blanking cover with be equipped with the second sealing member between the interior casing, right side blanking cover with be equipped with the third sealing member between the interior casing.

Furthermore, a fourth sealing element is arranged between the outer surface of the first piston in the radial direction and the first cavity, a fifth sealing element is arranged between the outer surface of the piston rod in the radial direction and the inner side of the first opening, and a sixth sealing element is arranged between the outer surface of the second piston in the radial direction and the second cavity.

Further, the first opening center line is coincident with the axis of the shell.

Further, the first piston and the second piston are identical in structure and equal in size.

Furthermore, the passageway contains and is equipped with first inlet channel and second inlet channel, first inlet channel with the one end of second inlet channel respectively with first actuating chamber with the second actuates the chamber and connects, and the other end all is used for being connected with the gas accuse valve of control high-pressure gas input.

Furthermore, the pneumatic control valve is also provided with a reversing valve for controlling high-pressure gas to enter and exit the channel.

Furthermore, the gas flow regulating device further comprises a throttling ring used for regulating the gas flow, the throttling ring is arranged in the second gas inlet channel, and the outer surface of the throttling ring in the radial direction is fixedly connected with the inner wall of the second gas inlet channel.

Another aspect of the present invention provides a liquid rocket engine, comprising the pneumatic control structure of the flow control valve as described above.

Compared with the prior art, the beneficial effects of the utility model are that: the pneumatic control structure of the flow control valve consists of a shell and a pneumatic control device. Wherein the content of the first and second substances,

the gas control device comprises a piston rod and a first piston and a second piston which are fixedly arranged at two ends of the piston rod, the piston rod is arranged in the first opening in an airtight mode, and due to the fact that the first piston is attached to the first cavity in a sealing mode along the radial outer side of the first piston and the second piston is attached to the second cavity in a sealing mode along the radial outer side of the second piston, gas is respectively reduced from being discharged from gaps between the first piston and the first cavity and between the second piston and the second cavity, sealing performance is improved, work of the first piston and the second piston is facilitated, meanwhile gas supply is reduced, equipment weight is further reduced, and cost is saved. In the whole process, gas can enter different actuating cavities from the channel, so that the piston can move in the shell in two directions, and the piston is matched with structures on two sides. The utility model discloses a device has the structure and simplifies, and weight alleviates and stable in structure advantage, can improve the leakproofness of valve, guarantees the engine reliability.

Drawings

FIG. 1 is a cut-away view of a valve with a control valve in a valve closed position;

FIG. 2 is a cut-away view of the control valve in a valve open neutral position;

FIG. 3 is a schematic view of the structure of the position limiting device;

fig. 4 is a perspective view of the piston rod;

FIG. 5 is a perspective view of the second intake passage with a throat portion therein;

fig. 6 is a plan view of the throttle ring.

Description of reference numerals:

1 first cavity 2 second cavity

3 first opening 4 piston rod

5 first piston 6 second piston

7 valve core 8 medium inlet end

9 valve seat 10 inner shell

11 left blanking cover of outer shell 12

13 right block cover 14 valve cover

15 first seal 16 second seal

17 third seal 18 fourth seal

19 fifth seal 20 sixth seal

21 third piston 22 ram

23-locking 24-pressure spring

25 spring cavity 26 locking groove

27 first channel 28 second channel

29 third channel 30 fourth channel

31 fifth channel 32 sixth channel

33 outlet channel 34 seventh channel

35 first intake passage 36 second intake passage

37 control valve 38 throttling ring

39 throat portion

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the spirit of the present invention will be described in detail with reference to the accompanying drawings, and any person skilled in the art can change or modify the techniques taught by the present invention without departing from the spirit and scope of the present invention after understanding the embodiments of the present invention.

The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. Additionally, the same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.

As used herein, the terms "first," "second," …, etc. do not denote any order or sequential importance, nor are they used to limit the invention, but rather are used to distinguish one element from another or from another element or operation described in the same technical language.

With respect to directional terminology used herein, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be illustrative and is not intended to be limiting of the present teachings.

As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.

As used herein, "and/or" includes any and all combinations of the described items.

As used herein, the terms "substantially", "about" and the like are used to modify any slight variation in quantity or error that does not alter the nature of the variation. Generally, the range of slight variations or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the aforementioned values can be adjusted according to actual needs, and are not limited thereto.

Certain words used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present application.

Referring to fig. 1, 2 and 3, an embodiment of the present invention provides an air control structure of a flow control valve, including a housing and an air control device located inside the housing.

The shell is internally provided with a first cavity 1 and a second cavity 2 which are arranged along the axial direction, and the first cavity 1 and the second cavity 2 are communicated through a first opening 3. The air control device comprises a piston rod 4 and a first piston 5 and a second piston 6 which are fixedly arranged at two ends of the piston rod 4. The piston rod 4 is arranged in the first opening 3 in an airtight mode, the first piston 5 is in sealing fit with the first cavity 1 along the radial outer side, and therefore the first piston 5 and the first cavity 1 define a first actuating cavity; the second piston 6 is in sealing engagement with the second chamber 2 radially on the outside, so that the second piston 6 and the second chamber 2 define a second actuating chamber.

The housing has a passage communicating the first actuating chamber and the second actuating chamber. And gas enters the first actuating cavity or the second actuating cavity through the channel to drive the piston rod to move in two directions.

Specifically, the method comprises the following steps: the pneumatic control structure of the flow control valve consists of a shell and a pneumatic control device. Wherein, set up the casing inside to have along the first cavity 1 and the second cavity 2 of axial alignment, first cavity 1 and second cavity 2 communicate through first trompil 3, and air control device includes piston rod 4 and fixed first piston 5 and the second piston 6 that sets up in this piston rod 4 both ends, and piston rod 4 sets up in first trompil 3 airtightly. Because the radial outer side of the first piston 5 is in sealing fit with the first cavity 1, and the radial outer side of the second piston 6 is in sealing fit with the second cavity 2, the gas is respectively reduced from being discharged from gaps between the first piston 5 and the first cavity 1 and between the second piston 6 and the second cavity 2, the sealing property is improved, the work of the first piston 5 and the second piston 6 is facilitated, the gas supply is reduced, the equipment weight is further reduced, and the cost is saved.

In the whole process, gas can enter different actuating cavities from the channel, so that the piston can move in the shell in two directions, and the piston is matched with structures on two sides. Specifically, one end of the first piston 5, which is far away from the second piston 6, is connected with the valve core 7, one end of the valve core 7, which is far away from the first piston 5, is used for being matched with the medium inlet end 8, gas enters the first actuating cavity through the channel to drive the valve core 7 to close the medium inlet end 8, and gas enters the second actuating cavity through the channel to drive the valve core 7 to open the medium inlet end 8. The whole device has the advantages of simplified structure, light weight and stable structure, can improve the sealing property of the valve, and ensures the reliability of the engine.

With continued reference to fig. 1, in the present embodiment, the housing comprises a valve seat 9, an inner housing 10, an outer housing 11, a left closure 12 and a right closure 13. A flow passage for medium to flow through and penetrate through two ends of the outer shell 11 is arranged along the axial direction in the outer shell. The inner shell 10 is located in the outer shell 11, the inner shell 10 can form a first cavity 1 and a second cavity 2 approximately in the radial middle of a medium channel of the outer shell 11, two ends of the inner shell 10 are respectively connected with a left blocking cover 12 and a right blocking cover 13, the left blocking cover 12 is located on one side of the inner shell 10, and the right blocking cover 13 is located on the opposite side of the left blocking cover 12 arranged on the inner shell 10.

The shell further comprises a valve seat 9 and a valve cover 14, the valve seat 9 and the valve cover 14 are respectively arranged at two ends of the outer shell 11, the valve seat 9 is located on one side, away from the air control device, of the valve core 7, the valve seat 9 is used for achieving opening and closing of the medium inlet end 8 through matching with the valve core 7, and the valve cover 14 is located on one side, away from the valve core 7, of the air control device. Wherein fluid can pass from the radially outer side of the inner housing 10. One end of the valve core 7 passes through the opening of the left blocking cover 12 and then abuts against the first piston 5, the other end of the valve core is used for being matched with the valve seat 9, the valve core 7 moves along the axial direction to realize contact and separation with the valve seat 9, and closing and opening of the medium channel are completed. It is worth mentioning that, in order to avoid the propellant from flowing out from the inside of the housing, the inside of the housing is tightly sealed, for example, a first sealing member 15 circumferentially arranged around the abutting end surfaces is respectively arranged between the valve seat 9 and the valve cover 14 and the housing, a second sealing member 16 is arranged between the side of the left block cover 12 far away from the valve seat 9 and the inner housing 10, and a third sealing member 17 is arranged between the side of the right block cover 13 far away from the valve cover 14 and the inner housing 10.

It is noted that for the first piston 5 and the first chamber 1 and the second piston 6 and the second chamber 2 to be tightly connected to avoid gas from flowing out of the gap, for example, a fourth sealing member 18 may be provided between the outer surface of the first piston 5 in the radial direction and the first chamber 1, and a sixth sealing member 20 may be provided between the outer surface of the second piston 6 in the radial direction and the second chamber 2. In order to avoid that the gas in the first chamber 1 and the gas in the second chamber 2 do not interfere with each other, it is advantageous for the first piston 5 and the second piston 6 to perform work, for example, the piston rod 4 is provided with a fifth sealing 19 along the outer surface in the radial direction and inside the first opening 3.

It should be further explained that, for convenience, first piston 5, second piston 6 and piston rod 4 move, the axis coincidence of 3 central lines of first trompil and casing, the piston rod 4 of being convenient for is connected with first piston 5 and second piston 6's center, and then guarantees that first piston 5 and second piston 6's lateral surface and shells inner wall all with the laminating, avoids first piston 5 and second piston 6 to take place to incline at the removal in-process, reinforcing structure's stability. For ease of installation and maintenance, in this embodiment, for example, the first and second pistons 5, 6 are identical in construction and size.

In the present embodiment, the stopper device is movable perpendicular to the axial direction, and the movement of the valve body 7 in the axial direction is restricted by contact with the piston rod 4. As shown in fig. 1, 2 and 4, the position limiting means includes a third piston 21, a rod 22, a locking member 23, a pressure spring 24 and a spring chamber 25. Third piston 21 and latch fitting 23 are connected respectively to the both ends of ejector pin 22, and pressure spring 24 is located spring chamber 25, and pressure spring 24 one end is fixed in spring chamber 25 bottom, and the other end is connected with third piston 21, and ejector pin 22 runs through pressure spring 24, and the other end connects latch fitting 23 after wearing out from pressure spring 24's one end. When gas enters the first actuating chamber through the channel to drive the valve element 7 to close the medium inlet end 8, one end of the locking element 23 abuts against the piston rod 4 so as to limit the valve element 7 to move in the axial direction. It should be further noted that to facilitate abutment of locking element 23 with plunger rod 4 and movement of third piston 21, spring cavity 25 is located one-half of the housing in the axial direction and has one end recessed toward the housing axis, and spring cavity 25 acts like a guide to facilitate movement of third piston 21. In addition, the inner wall of the concave side is provided with an opening communicated with the second air inlet channel 36, and the opening direction is parallel to the axial direction

It should be further noted that, when the valve core 7 closes the medium inlet end 8, in order to fix the piston rod 4 and prevent the piston rod 4 from moving in the axial direction, for example, the piston rod 4 is provided with a locking groove 26 on the surface in the radial direction, which is matched with the fixed locking element 23, and the locking groove 26 is a structure with one end recessed toward the axial direction of the piston rod 4.

Specifically, the limiting device is used for locking the valve core 7 when the valve is closed, so that the valve is always in a closed state and is not interfered by reverse medium pressure. When the valve core 7 closes the medium inlet end 8, the valve core 7 is used for reversely pushing the third piston 21 by pneumatic force to drive the mandril 22 to move, the locking piece 23 is cut into the locking groove 26, the piston rod 4 is in a locking state and cannot drive the valve core 7 to axially move, and at the moment, the valve core 7 closes the medium inlet end 8. When the piston rod 4 is in the locked state, the pressure spring 24 is compressed, and when the external pressure of the third piston 21 is smaller than the acting force of the pressure spring 24, the tension of the pressure spring 24 moves the third piston 21 to the side away from the locking groove 26, so that the locking piece 23 is separated from the locking groove 26 of the body part of the piston rod 4 to realize unlocking.

In this embodiment, the pneumatic control structure of the flow control valve further comprises a cavity-crossing preventing device for conveniently discharging the leakage gas inside the housing from the housing. The cavity cross-proof device comprises a first channel 27, a second channel 28, a third channel 29, a fourth channel 30, a fifth channel 31, a sixth channel 32 and an outlet channel 33. Wherein the first channel 27, the second channel 28, the third channel 29 and the outlet channel 33 are located on the housing, the fourth channel 30 and the fifth channel 31 are located on the right cap 13, and the sixth channel 32 is located on the left cap 12. One end of the first channel 27 is communicated with the spring cavity 5, the other end is connected with the fourth channel 30, the other end of the fourth channel 30 is communicated with the fifth channel 31, the fifth channel 31 is communicated with the second channel 28, and one end of the second channel 28 is connected with the outlet channel 33. One end of the sixth channel 32 is connected with the first cavity formed by the first piston 5 and the left block cover 12, the other end of the sixth channel 32 is communicated with the third channel 29, and the other end of the third channel 29 is connected with the outlet channel 33. It is to be understood that the fourth channel 30 and the fifth channel 31 are divided into two channels for the convenience of description, and not for the limitation of the present invention, and the channels provided in the housing are similar to each other.

It should be noted that the junction of the fourth channel 30 and the fifth channel 31 is connected to the seventh channel 34, and one end of the seventh channel 34 is connected to the second cavity 2. Any leakage of the liquid propellant flowing through the sealing rings in the shell and any leakage of the control gas passing through the sealing rings are discharged out of the shell through the cavity crossing preventing device, and the movement of the pneumatic control device or the limiting device is prevented from being blocked.

It should be noted that, in this embodiment, the channel includes a first air inlet channel 35 and a second air inlet channel 36, one end of the first air inlet channel 35 and one end of the second air inlet channel 36 are respectively connected to the first actuating chamber and the second actuating chamber, and the other end of the first air inlet channel 35 and the other end of the second air inlet channel 36 are both used for being connected to a control valve 37 for controlling the input of high-pressure gas, and the high-pressure gas can enter the actuating chambers through the control valve 37 and the air inlet channels, so as to realize the movement of the valve element 7.

In addition, in order to facilitate the adjustment of the gas direction, a reversing valve is provided outside the control valve 37, the control pressure medium for operating the valve structure is a high pressure gas, which is usually helium or nitrogen, and the reversing valve is provided with a first position and a second position. The pressure medium selectively enters the first cavity 1 or the second cavity 2 through the reversing valve. For example, the following steps are carried out: according to the illustration of FIG. 1: when the valve is closed, high-pressure gas flows through the first air inlet channel 35 to the first cavity 1 through the reversing valve, and at the moment, the first cavity 1 forms a high-pressure air cavity (a space formed by the first piston 5 close to the first air inlet channel 35 side and the inner shell 10), namely a first actuating cavity, and pushes the first piston 5 and the valve core 7 to press the valve seat 9. At this time, the control gas in the second cavity 2 is exhausted through the second inlet channel 36 of the housing, so as to complete the pressure relief and the closing action of the valve. The first piston 5, the piston rod 4 and the second piston 6 when the valve is closed are set to the first position of the pneumatic control means, and the position of the diverter valve is set to the first position of the diverter valve. According to fig. 2, after the reversing valve is reversed, the high-pressure gas flows through the second gas inlet channel 36 through the reversing valve, and the second cavity 2 forms a high-pressure gas cavity (a space formed by the second piston 6 close to the second gas inlet channel 36 and the inner shell 10), namely a second pneumatic cavity, and pushes the first piston 5 and the valve core 7 to be far away from the valve seat 9. At this time, the control gas in the first cavity 1 is exhausted through the first inlet channel 35 of the housing, so as to complete the pressure relief, and the valve completes the opening action. The first piston 5, the piston rod 4 and the second piston 6 when the valve is open are set to the second position of the pneumatic control means, and the position of the diverter valve is set to the second position of the diverter valve.

As shown in fig. 1, 2 and 6, when the valve is closed, the force generated by the control gas pressure needs to overcome the reverse thrust generated by the propellant pressure on the valve core 7, and when the valve is opened, the pressure needed by the control gas to open and close the valve is different because the propellant pressure also acts as the force to open the valve core 7. In order to ensure that the valve element 7 is forced in the axial direction as required and at the same time the amount of high-pressure gas is reduced, for example, an adjusting mechanism may be provided in the second inlet passage 36. For example, the adjustment mechanism may be a throttle washer 38 with a through hole. The outer surface of the throttle ring 38 in the radial direction is in sealing contact with the inner wall of the second intake passage 36. The throttle ring is arranged on the second air inlet channel, so that the valve can be ensured to be stressed in the axial direction of the valve core 7 as required when the valve is opened and closed, high-pressure gas can be saved, and the cost is reduced. In addition, for convenience of adjustment, the through holes of the throttle ring 38 may be one or more, and are not discussed herein.

In practical applications, as shown in fig. 5, a throat portion may be provided in the second air intake passage, that is, a surface of one third of the second air intake passage may be formed to be concave toward the center of the second air intake passage, so as to reduce the air flow of the second air intake passage.

Furthermore, the media inlet end 8 and media outlet end (not labeled, the end opposite the media inlet end 8) directions may also be interchanged. In addition, the control valve can be suitable for high-low pressure ultralow temperature working conditions.

Another aspect of the present invention provides a liquid rocket engine, comprising the pneumatic control structure of the flow control valve as described above.

The foregoing is only an illustrative embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention should fall within the protection scope of the present invention.

Claims (10)

1. An air control structure of a flow control valve is characterized by comprising a shell and an air control device positioned in the shell, wherein,

the air control device comprises a piston rod and a first piston and a second piston which are fixedly arranged at two ends of the piston rod, the piston rod is arranged in the first opening in an airtight mode, the first piston is in sealing fit with the first cavity along the radial outer side, so that the first piston and the first cavity define a first actuating cavity, the second piston is in sealing fit with the second cavity along the radial outer side, and the second piston and the second cavity define a second actuating cavity;

the shell is provided with a channel which is communicated with the first actuating cavity and the second actuating cavity;

and gas enters the first actuating cavity or the second actuating cavity through the channel to drive the piston rod to move in two directions.

2. The pneumatic control structure of a flow control valve according to claim 1, wherein the housing comprises an inner housing, an outer housing, a left closure cap and a right closure cap; a flow channel for medium circulation and penetrating through two ends of the flow channel is arranged in the outer shell along the axial direction; the interior casing is located in the shell, just interior casing is used for forming first cavity with the second cavity, the both ends of interior casing respectively with left side blanking cover with right side blanking cover is connected, a left side blanking cover is located one side of interior casing, right side blanking cover is located interior casing sets up the opposite side of a left side blanking cover.

3. The pneumatic control structure of a flow control valve according to claim 2, wherein a second sealing member is arranged between one side of the left block cover and the inner shell, and a third sealing member is arranged between the right block cover and the inner shell.

4. The pneumatic control structure of a flow control valve according to claim 1, wherein a fourth sealing member is disposed between the first piston and the first cavity along the outer surface in the radial direction, a fifth sealing member is disposed between the piston rod and the inner side of the first opening along the outer surface in the radial direction, and a sixth sealing member is disposed between the second piston and the second cavity along the outer surface in the radial direction.

5. The pneumatic control structure of a flow control valve according to claim 1, characterized in that: the first opening center line coincides with the axis of the shell.

6. The pneumatic control structure of a flow control valve according to claim 1, characterized in that: the first piston and the second piston have the same structure and the same size.

7. The pneumatic control structure of the flow control valve according to claim 1, wherein the passage comprises a first air inlet passage and a second air inlet passage, one end of the first air inlet passage and one end of the second air inlet passage are respectively connected with the first actuating cavity and the second actuating cavity, and the other ends of the first air inlet passage and the second air inlet passage are respectively used for being connected with a pneumatic control valve for controlling input of high-pressure gas.

8. An air control structure of a flow control valve according to claim 7, wherein a reversing valve for controlling high-pressure gas to enter and exit the passage is further arranged on the air control valve.

9. The pneumatic control structure of the flow control valve according to claim 7, further comprising a throttle ring for adjusting the flow of gas, wherein the throttle ring is arranged in the second air inlet passage, and the outer surface of the throttle ring in the radial direction is fixedly connected with the inner wall of the second air inlet passage.

10. A liquid rocket engine, comprising: an air control structure comprising a flow control valve according to any of claims 1 to 9.

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