A gas-controlled high-pressure variable flow control valve

Abstract

The present invention provides a pneumatically controlled high-pressure variable flow control valve, which mainly solves the technical problems of poor flow resistance stability, weak structural interchangeability, large action response dispersion, and disadvantageous mass production of existing variable flow control valves. The control valve of the present invention comprises a valve body, a main valve assembly and a secondary valve assembly arranged in the valve body; the main valve assembly is composed of 4 main valves with the same structure, and the secondary valve assembly is composed of 2 secondary valves with the same structure; the 4 main valves are perpendicular to the central axis of the valve body, and the 4 main valves are grouped in pairs, and the two main valves in each group are located in the same circumference of the valve body, and the central axes of the 4 main valves are located on the same plane or parallel to each other. There are 2 outlets on the valve body, and the medium outlets of the two main valves located on the coaxial side of the central axis of the valve body share the same outlet. The control valve of the present invention has a compact overall structure and a small volume, and the various components have strong interchangeability, which is suitable for mass production.

Description

Technical Field

[0001] The invention relates to an engine propellant flow control device, in particular to a gas-controlled high-pressure variable flow control valve. Background Art

[0002] The existing liquid rocket variable thrust engine needs to be equipped with a variable flow control valve to control the flow of the engine propellant. In the prior art, the variable flow control valve mostly adopts a slide valve flow control valve, which can adjust the flow, but its structure is relatively complex, and due to the dispersion of parts processing and the uneven flow field inside the valve, the flow resistance deviation between each flow control valve is large, and it is necessary to conduct a liquid flow test to adjust the flow resistance after assembly with the thrust chamber. After the liquid flow test, the control valve needs to be disassembled, and the valve needs to be dried before being assembled with the thrust chamber to form an engine for delivery. The product test cycle is long, there is no interchangeability, and it is not conducive to mass production. At the same time, the system puts forward higher requirements on the consistency of the opening and closing response of the variable flow control valve, requiring the dispersion to be less than ±3ms, which is difficult to design for variable thrust control valves with large flow. Summary of the invention

[0003] The main purpose of the present invention is to solve the technical problems of the existing variable flow control valve, such as poor flow resistance stability, weak structural interchangeability, large action response dispersion, long product testing cycle and being unfavorable for mass production, and to provide a gas-controlled high-pressure variable flow control valve.

[0004] To achieve the above-mentioned purpose, the present invention provides a gas-controlled high-pressure variable flow control valve, which is special in that it includes a valve body, a main valve assembly and a secondary valve assembly arranged in the valve body;

[0005] The main valve assembly is composed of M main valves with the same structure, and the auxiliary valve assembly is composed of N auxiliary valves with the same structure, wherein N=2, 2≤M≤8; M main valve mounting holes and N auxiliary valve mounting holes are arranged in the valve body; the main valve is arranged in the main valve mounting hole, and the auxiliary valve is arranged in the auxiliary valve mounting hole;

[0006] The M main valve mounting holes are perpendicular to the central axis of the valve body and are evenly distributed inside the valve body along the same circumferential direction or two circumferential directions, and each main valve mounting hole is provided with a first medium inlet and a medium outlet connected to the outside;

[0007] The N auxiliary valve mounting holes are symmetrically arranged at both ends of the valve body in the axial direction, and a first channel is arranged between two auxiliary valve mounting holes on the same axis, and the first channel is radially connected with an air inlet;

[0008] A second channel communicating with each other is provided between each main valve installation hole and a secondary valve installation hole adjacent to or close to the main valve installation hole;

[0009] The valve body is provided with an outlet connected to the medium outlet.

[0010] Furthermore, the number M of the main valves is 4, the 4 main valves are grouped in pairs, the two main valves in each group are located in the same circumferential direction of the valve body, the central axes of the 4 main valves are located in the same plane or parallel to each other, and there are 2 outlets, and the two main valves located on the coaxial side of the central axis of the valve body share the same outlet through the medium outlet.

[0011] Further, the main valve comprises a main valve seat and a main valve core arranged in the main valve seat;

[0012] The main valve core comprises a first column section, a second column section, a third column section and a fourth column section in sequence along the axial direction; a first convex ring is provided at the outer end of the fourth column section;

[0013] A second convex ring is provided on the inner side of the outer end of the main valve seat, the middle part of the second convex ring is a fluid channel, and the diameter of the cross section of the second convex ring is smaller than the diameter of the cross section of the third column segment; the second convex ring contacts the inner end surface of the first column segment to form a sealing pair; an annular spring groove is axially provided on the main valve seat, and the spring groove is embedded in the shell of the main valve seat; a main spring is built in the spring groove, one end of the main spring is arranged in the spring groove, and the other end is limited to the outer end of the first convex ring.

[0014] Furthermore, the main valve seat is evenly distributed with at least two second medium inlets along the radial direction, and the sum of the flow areas of the second medium inlets is larger than the flow area of ​​the fluid channel in the middle of the second convex ring.

[0015] Furthermore, an annular groove is provided on the circumferential outer side of the third column section of the main valve core, and a sealing ring is built into the annular groove;

[0016] A first cavity is formed between the inner end surface of the fourth column section of the main valve core and the inner wall surface of the main valve installation hole.

[0017] Furthermore, the auxiliary valve comprises an auxiliary valve housing, a coil assembly, and an auxiliary valve seat, an auxiliary valve core and an auxiliary spring which are sequentially arranged on the inner side of the coil assembly from the inside to the outside along the axial direction; a third channel and an exhaust channel are respectively arranged at two axial ends of the auxiliary valve, the third channel passes through the auxiliary valve seat and is connected to the first channel; the flow area of ​​the exhaust channel is larger than the flow area of ​​the third channel close to one end of the auxiliary valve core;

[0018] A groove is provided on the outer side of the auxiliary valve core along the axial direction, and a second cavity is formed between the groove, the auxiliary valve housing and the auxiliary valve seat, and the second cavity connects the two ends of the auxiliary valve core;

[0019] A plurality of fourth channels are provided in the auxiliary valve seat, and the angle between each of the fourth channels and the axis of the auxiliary valve seat is φ, and φ is 60-75°; one end of the fourth channel is located close to the auxiliary valve core, and the other end connects the adjacent auxiliary valve mounting hole with the main valve mounting hole through the second channel.

[0020] Furthermore, a third convex ring is provided at the circumferential middle of the auxiliary valve seat, and an adjusting gasket is provided between the side of the third convex ring close to the auxiliary valve core and the auxiliary valve housing;

[0021] The third convex ring is separated from the auxiliary valve core by a side thereof and the auxiliary valve housing and the inner wall of the auxiliary valve mounting hole to form a third cavity, and the third cavity is connected to the second channel and the fourth channel.

[0022] Furthermore, a first sealing block and a second sealing block are respectively provided at the axial ends of the auxiliary valve core. The setting of the first sealing block and the second sealing block can effectively realize the circulation of control gas in the valve body when the auxiliary valve is energized, or the discharge of excess control gas in the valve body after the auxiliary valve is powered off.

[0023] Furthermore, a filter screen is provided at the entrance of the third channel to prevent excess matter in the control gas from entering the auxiliary valve and downstream.

[0024] Furthermore, the number of the fourth channels is 4-10.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention is a pneumatically controlled high-pressure variable flow control valve, which adopts a structure of a combination of independently working auxiliary valves and multiple main valves. Each auxiliary valve controls two main valves respectively. The change of the medium flow area is achieved through the switch combination of each main valve, thereby achieving the purpose of rapid flow switching and control, and improving the stability of the control valve flow resistance and the action responsiveness.

[0027] (2) The present invention adopts a modular design concept. The structures of the two auxiliary valves are exactly the same, and the structures of the four main valves are also exactly the same. Each auxiliary valve controls one oxidant main valve and one fuel main valve respectively. The valve body of the control valve is provided with one air inlet, two exhaust channels, four medium inlets and two outlets. The overall structure is compact and small in size. The various components have strong interchangeability and are suitable for mass production.

[0028] (3) The main valve core of the main valve of the present invention adopts a positive unloading structure design, which reduces the influence of the inlet pressure on the force of the main valve core, so that the medium force of the main valve core is always in the closing direction, and adopts a spring force loading structure to provide a strong closing force for the main valve core, thereby improving its closing response speed; the opening response speed of the main valve core is related to the area of ​​the main valve core piston. By reasonably optimizing the relationship between the exhaust rate and the piston area, the opening force and the opening response speed can be maximized.

[0029] (4) The variable flow control method of the present invention is simple and has various control modes, and is particularly suitable for variable thrust control systems with high pressure and large flow. Two variable flow control modes are adopted: one is to open the first auxiliary valve alone, and open the first main valve and the second main valve at the same time to form a small flow supply state. When the two auxiliary valves are opened at the same time, the four main valves are opened at the same time, and the two main paths of each propellant are superimposed to form a large flow supply state. The second is to add flow limiting rings at the four propellant inlets so that the two auxiliary valves correspond to large flow and small flow respectively, that is, when the first auxiliary valve is opened and the second auxiliary valve is closed, the first main valve and the second main valve are opened at the same time, corresponding to the small flow state; when it is necessary to switch to the large flow state, the first auxiliary valve is closed, the second auxiliary valve is opened, and the third main valve and the fourth main valve are opened at the same time, corresponding to the large flow state, so as to accurately control the flow according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an embodiment of a gas-controlled high-pressure variable flow control valve of the present invention;

[0031] Figure 2 This is a schematic diagram of the valve body structure of an embodiment of a gas-controlled high-pressure variable flow control valve of the present invention;

[0032] Figure 3 This is a main valve structure diagram of an embodiment of a gas-controlled high-pressure variable flow control valve of the present invention;

[0033] Figure 4 This is a structural diagram of an auxiliary valve of an embodiment of a gas-controlled high-pressure variable flow control valve of the present invention.

[0034] The reference numerals are as follows:

[0035] 1-valve body, 11-main valve mounting hole, 12-auxiliary valve mounting hole, 13-first medium inlet, 14-medium outlet, 15-second channel, 16-first channel, 17-inlet, 18-third channel, 19-fourth channel, 20-outlet, 2-main valve, 201-first main valve, 202-second main valve, 203-third main valve, 204-fourth main valve, 21-main valve seat, 211-second convex ring, 212-spring groove, 213-main spring, 214-second medium inlet, 22-main valve core, 221-first column Segment, 222-second column segment, 223-third column segment, 224-fourth column segment, 225-annular groove, 226-first convex ring, 23-first cavity, 3-auxiliary valve, 301-first auxiliary valve, 302-second auxiliary valve, 31-auxiliary valve housing, 32-coil assembly, 33-auxiliary valve seat, 331-third convex ring, 332-adjusting gasket, 34-auxiliary valve core, 341-first sealing block, 342-second sealing block, 35-auxiliary spring, 36-exhaust channel, 37-second cavity, 38-third cavity, 39-filter screen. DETAILED DESCRIPTION

[0036] In order to make the purpose, advantages and features of the present invention clearer, a gas-controlled high-pressure variable flow control valve proposed by the present invention is further described in detail below in combination with the accompanying drawings and specific embodiments. According to the following specific implementation methods, the advantages and features of the present invention will be clearer. The accompanying drawings are simplified in form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. It should be noted that the terms "inner", "inner end", etc. used in the present invention refer to the side close to the central axis of the valve body, "outer", "outer end", etc. refer to the side away from the central axis of the valve body, and the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] Combination Figure 1 and Figure 2 , a pneumatically controlled high-pressure variable flow control valve of the present embodiment comprises a valve body 1, a main valve assembly and a sub-valve assembly arranged in the valve body 1; the main valve assembly is composed of M main valves 2 of the same structure, and the sub-valve assembly is composed of N sub-valve 3 of the same structure, wherein N=2, 2≤M≤8. M main valve mounting holes 11 and N sub-valve mounting holes 12 are arranged in the valve body 1; the main valve 2 is arranged in the main valve mounting hole 11, and the sub-valve 3 is arranged in the sub-valve mounting hole 12. The M main valve mounting holes 11 are perpendicular to the central axis of the valve body 1, and are evenly distributed inside the valve body 1 along the same circumferential direction or two circumferential directions, and each main valve mounting hole 11 is provided with a first medium inlet 13 and a medium outlet 14 connected to the outside. N auxiliary valve mounting holes 12 are symmetrically arranged at both ends of the valve body 1 in the axial direction, and a first channel 16 is arranged between the two auxiliary valve mounting holes 12 on the same axis, and an air inlet 17 is radially connected to the first channel 16; a second channel 15 is arranged between each main valve mounting hole 11 and an auxiliary valve mounting hole 12 on the adjacent or near side, which is used to connect the auxiliary valve 3 with the main valve 2 on both sides adjacent to it. When the main valve 2 is installed in the main valve mounting hole 11, the main valve 2 will isolate the first medium inlet 13 and the medium outlet 14. The valve body 1 is also provided with an outlet 20 connected to the medium outlet 14, and the medium is discharged from the valve body 1.

[0038] In this embodiment, there are four main valves 2, namely the first main valve 201, the second main valve 202, the third main valve 203 and the fourth main valve 204, wherein the first main valve 201 and the second main valve 202 are oxidant main valves, and the third main valve 203 and the fourth main valve 204 are fuel main valves; or, the first main valve 201 and the second main valve 202 are fuel main valves, and the third main valve 203 and the fourth main valve 204 are oxidant main valves. The four main valves 2 are grouped in pairs, and the two main valves in each group are located in the same circumferential direction of the valve body 1, and the central axes of the four main valves are located in the same plane. There are two outlets 20, and the two main valves 2 located on the coaxial side of the central axis of the valve body 1 share the same outlet 20 through the medium outlet 14. There are two auxiliary valves 3, namely the first auxiliary valve 301 and the second auxiliary valve 302. The two main valves on the coaxial side share an outlet 20, that is, the medium of the first main valve 201 and the second main valve 202 is discharged through the medium outlet 14, and then discharged from the valve body 1 from the outlet 20 together, and the medium of the third main valve 203 and the fourth main valve 204 is discharged through the medium outlet 14, and then discharged from the valve body 1 from the outlet 20 together, which is convenient for controlling the large and small flow rates of the same medium.

[0039] The four main valves 2 are sealed to the main valve mounting holes 11 respectively by rubber O-rings, and the two auxiliary valves 3 are sealed to the auxiliary valve mounting holes 12 respectively by rubber O-rings. Each auxiliary valve 3 controls the opening and closing of the adjacent oxidant main valve and fuel main valve, that is, the first auxiliary valve 301 controls the opening and closing of the first main valve 201 and the third main valve 203, and the second auxiliary valve 302 controls the opening and closing of the second main valve 202 and the fourth main valve 204.

[0040] Combination Figure 1 and Figure 3 As shown, the main valve 2 includes a main valve seat 21 and a main valve core 22 disposed in the main valve seat 21; the main valve core 22 includes a first column section 221, a second column section 222, a third column section 223 and a fourth column section 224 in the axial direction; a first convex ring 226 is disposed at the outer end of the fourth column section 224; a second convex ring 211 is disposed on the inner side of the outer end of the main valve seat 21, the middle part of the second convex ring 211 is a fluid channel, and the diameter of the cross section of the second convex ring 211 is smaller than the diameter of the cross section of the third column section 223; the second convex ring 211 and the inner end surface of the first column section 221 are connected. They are in contact to form a sealing pair; an annular spring groove 212 is axially provided on the main valve seat 21, and the spring groove 212 is embedded in the shell of the main valve seat 21; the spring groove 212 has a main spring 213 built in, one end of the main spring 213 is arranged in the spring groove 212, and the other end is limited to the outer end of the first convex ring 226. When the control gas pressure acting on the fourth column section 224 of the main valve core 22 is less than the opening pressure of the main valve core 22, the main valve core 22 is attached and sealed to the second convex ring 211 of the main valve seat 21 under the action of the spring force and the inlet medium force.

[0041] An annular groove 225 is provided on the circumferential outer side of the third column section 223 of the main valve core 22, and a sealing ring is built in the annular groove 225, which can not only ensure the sealing of the main valve core 22 and the main valve seat 21, but also ensure the axial stability of the main valve core 22 during the movement. The diameter of the cross section of the third column section 223 of the main valve core 22 is larger than the diameter of the second convex ring 211 of the main valve seat 21. This structural design makes the inlet medium force always in the direction of closing the main valve core 22, which is conducive to improving the closing response and consistency of the main valve core 22.

[0042] The inner end surface of the fourth column section 224 of the main valve core 22 and the inner wall surface of the main valve installation hole 11 form a first cavity 23. When the auxiliary valve 3 is powered off, the control gas in the first cavity 23 enters the auxiliary valve 3 through the second channel 15 and is then discharged through the auxiliary valve 3.

[0043] The main valve seat 21 has at least two second medium inlets 214 evenly distributed in the radial direction, and the sum of the flow areas of the second medium inlets 214 is larger than the flow area of ​​the fluid channel in the middle of the second convex ring 211 to prevent throttling of the main valve 2 inlet.

[0044] Combination Figure 1 and Figure 4 As shown, the structures of the two auxiliary valves 3 of this embodiment are exactly the same. The auxiliary valve 3 includes an auxiliary valve housing 31, a coil assembly 32, and an auxiliary valve seat 33, an auxiliary valve core 34 and an auxiliary spring 35 which are sequentially arranged on the inner side of the coil assembly 32 along the axial direction from the inside to the outside; the auxiliary valve 3 is provided with a third channel 18 and an exhaust channel 36 at both axial ends, respectively. The flow area of ​​the exhaust channel 36 is larger than the flow area of ​​the third channel 18 close to the end of the auxiliary valve core 34. This structural design increases the medium force of the auxiliary valve core 34 at the exhaust channel 36, which is beneficial to reduce the electromagnetic suction force required to overcome the auxiliary spring force and seal after the auxiliary valve core 34 is opened. The difference in diameter between the exhaust channel 36 and the third channel 18 directly affects the exhaust and intake rates, and further affects the response time of the main valve 2. The present invention optimizes the structure and performance, and the diameter of the exhaust channel 36 is Φ2mm, and the diameter of the third channel 18 is Φ

[0045] 1.6mm, the number of turns of the coil assembly 32 of the auxiliary valve 3 is finally optimized to be 1300-1350 turns, and the resistance of the coil assembly 32 is 42-43.5 ohms. The third channel 18 runs through the auxiliary valve seat 33 and is connected to the first channel 16. A filter screen 39 is also provided at the entrance of the third channel 18 to prevent excess matter in the control gas from entering the auxiliary valve 3 and downstream.

[0046] A groove is provided on the outer side of the auxiliary valve core 34 in the axial direction, and a second cavity 37 is formed between the groove, the auxiliary valve housing 31 and the auxiliary valve seat 33. The second cavity 37 connects the two ends of the auxiliary valve core 34.

[0047] A plurality of fourth channels 19 are provided in the auxiliary valve seat 33, generally 4-10 fourth channels 19 are provided, and the angle between each fourth channel 19 and the axis of the auxiliary valve seat 33 is φ, and φ is generally 60-75°; one end of the fourth channel 19 is located close to the auxiliary valve core 34, and the other end connects the adjacent auxiliary valve mounting hole 12 with the main valve mounting hole 11 through the second channel 15.

[0048] A third convex ring 331 is provided in the circumferential middle of the auxiliary valve seat 33. An adjusting gasket 332 is provided between the side of the third convex ring 331 close to the auxiliary valve core 34 and the auxiliary valve housing 31, which is used to adjust the opening of the auxiliary valve core 34, and then adjust the intake and exhaust rates. A third cavity 38 is formed between the side of the third convex ring 331 away from the auxiliary valve core 34, the auxiliary valve housing 31, and the inner wall of the auxiliary valve mounting hole 12. The third cavity 38 communicates with the second channel 15 and the fourth channel 19.

[0049] A first sealing block 341 and a second sealing block 342 are respectively provided at the two axial ends of the auxiliary valve core 34; the first sealing block 341 is adapted to the exhaust channel 36 and is located at the connection between the second cavity 37 and the exhaust channel 36; the second sealing block 342 is adapted to the third channel 18 and is located at the connection between the second cavity 37 and the third channel 18. The material of the first sealing block 341 and the second sealing block 342 is plastic or rubber. When the sealing pressure ratio is ≤3MPa, the sealing block is preferably made of rubber material with good sealing performance; when the sealing pressure ratio is greater than 3MPa, the sealing block is preferably made of plastic material, so that the service life of the sealing pair is extended and the stability is better.

[0050] Combination Figure 1 , Figure 3 and Figure 4 When the auxiliary valve 3 is powered on, the third channel 18 is in an open state and the exhaust channel 36 is in a closed state, that is, the second sealing block 342 is separated from the third channel 18, and the first sealing block 341 is sealed with the exhaust channel 36. The control gas enters from the air inlet 17, passes through the first channel 16 and the third channel 18 in sequence, enters the second cavity 37, then enters the third cavity 38 through the fourth channel 19, and then passes through the second channel 15, and finally reaches the first cavity 23, that is, the fourth column section 224 of the main valve core 22, and forms a medium force in the opening direction on the main valve core 22, which overcomes the inlet medium force of the first medium inlet 13 and the second medium inlet 214 and the spring force of the main spring 213, so that the main valve core 22 is separated from the second convex ring 211 of the main valve seat 21, and the main valve core 22 is opened, and the main valve 2 is opened.

[0051] When the auxiliary valve 3 is powered off, the third channel 18 is in a closed state and the exhaust channel 36 is in an open state, that is, the second sealing block 342 is sealed with the third channel 18, and the first sealing block 341 is separated from the entrance of the exhaust channel 36; the control gas reaching the first cavity 23 before power failure enters the third cavity 38 through the second channel 15, then enters the second cavity 37 through the fourth channel 19, and is discharged through the exhaust channel 36. At this time, the main valve core 22 fits with the second convex ring 211 under the action of the inlet medium force and the spring force of the main spring 213, and the main valve 2 is in a closed state.

[0052] Combination Figures 1 to 4 This embodiment provides two variable flow control methods for the control valve, wherein the first main valve 201 and the second main valve 202 are oxidant main valves, and the third main valve 203 and the fourth main valve 204 are fuel main valves. The specific control methods are introduced below.

[0053] Variable flow control method 1: When the engine needs a small flow supply, the coil assembly 32 of the first auxiliary valve 301 is energized to make the auxiliary valve core 33 open the third channel 18 and close the exhaust channel 36. The control air enters from the air inlet 17, passes through the first channel 16, the third channel 18, the second cavity 37, and the fourth channel 19 in sequence to enter the third cavity 38, then passes through the second channel 15, and finally reaches the first cavity 23, that is, the fourth column section 224 of the main valve core 22, and forms a medium force in the opening direction on the main valve core 22. The force overcomes the inlet medium force of the first medium inlet 13 and the second medium inlet 214 and the spring force of the main spring 213, so that the main valve core 22 is separated from the second convex ring 211 of the main valve seat 21, and the main valve core 22 is opened. At this time, the first main valve 201 and the third main valve 203 are opened at the same time, forming a small flow supply state.

[0054] When the engine needs a large flow supply, the coil assembly 32 of the second auxiliary valve 302 is energized, and the second main valve 202 and the fourth main valve 204 are opened. At this time, the flow areas are superimposed to form a large flow supply state, that is, when the first auxiliary valve 301 and the second auxiliary valve 302 are opened at the same time, the four main valves are opened at the same time, and the two main paths of each propellant are superimposed to form a large flow supply state.

[0055] Variable flow control method 2: The present invention can also add flow limiting circles at the four propellant inlets, that is, the first medium inlets 13 of the four main valves 2, to control the flow area of ​​each propellant medium, set the first auxiliary valve 301 to a small flow state corresponding to the engine supply, and set the second auxiliary valve 302 to a large flow state corresponding to the engine supply.

[0056] The specific control method is: when the engine needs a small flow supply, the coil assembly 32 of the first auxiliary valve 301 is energized to open the third channel 18 of the first auxiliary valve 301 and close the exhaust channel 36. The control gas enters from the air inlet 17, passes through the first channel 16, the third channel 18, the second cavity 37, and the fourth channel 19 in sequence to enter the third cavity 38, then passes through the second channel 15, and finally reaches the first cavity 23, that is, the fourth column section 224 of the main valve core 22, and forms a medium force in the opening direction on the main valve core 22, which overcomes the inlet medium force of the first medium inlet 13 and the second medium inlet 214 and the spring force of the main spring 213, so that the main valve core 22 is separated from the second convex ring 211 of the main valve seat 21, and the first main valve 201 and the third main valve 203 are opened at the same time. At the same time, the second auxiliary valve 302 is de-energized, so that the third channel 18 of the auxiliary valve core 34 of the second auxiliary valve 302 is closed and the exhaust channel 36 is opened, that is, the second main valve 202 and the fourth main valve 204 are closed, forming a small flow supply state of the engine.

[0057] When the engine needs a large flow supply, the first auxiliary valve 301 is powered off and the second auxiliary valve 302 is powered on, so that the first main valve 201 and the third main valve 203 are closed and the second main valve 202 and the fourth main valve 204 are opened, thereby forming a large flow supply state.

[0058] In summary, the variable flow control method of the present invention is simple and has various control modes. It can accurately control the flow according to actual needs and is particularly suitable for variable thrust control systems with high pressure and large flow.

[0059] The present invention adopts a modular design concept. The structures of the two auxiliary valves are exactly the same, and the structures of the four main valves are also exactly the same. Each auxiliary valve controls one oxidant main valve and one fuel main valve respectively. The valve body of the control valve is provided with four medium inlets, two outlets (that is, the medium outlets of the two main valves on the coaxial side share one outlet), one air inlet and two exhaust channels. The overall structure is compact and small in size. The various components have strong interchangeability and are suitable for mass production.

[0060] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents. The above contents are only used to illustrate the present invention, and it cannot be determined that the specific implementation methods of the present invention are limited thereto. For those skilled in the art, as long as they are within the scope of the essential spirit of the present invention, the changes and modifications of the above embodiments should be deemed to be within the scope of the claims of the present invention.

Claims

1. A gas-controlled high-pressure variable flow control valve, characterized in that: It comprises a valve body (1), a main valve assembly and a secondary valve assembly arranged in the valve body (1); The main valve assembly is composed of four main valves (2) with the same structure, and the auxiliary valve assembly is composed of two auxiliary valves (3) with the same structure; The valve body (1) is provided with four main valve mounting holes (11) and two auxiliary valve mounting holes (12); the main valve (2) is arranged in the main valve mounting hole (11), and the auxiliary valve (3) is arranged in the auxiliary valve mounting hole (12); The four main valve mounting holes (11) are perpendicular to the central axis of the valve body (1) and are evenly distributed inside the valve body (1) along the same circumferential direction, and each main valve mounting hole (11) is provided with a first medium inlet (13) and a medium outlet (14) connected to the outside; the four main valves (2) are grouped in pairs, and the two main valves (2) in each group are located in the same circumferential direction of the valve body (1), and the central axes of the four main valves (2) are located on the same plane or parallel to each other; The main valve (2) comprises a main valve seat (21) and a main valve core (22) arranged in the main valve seat (21); The main valve core (22) comprises a first column section (221), a second column section (222), a third column section (223) and a fourth column section (224) in sequence along the axial direction; a first convex ring (226) is provided at the outer end of the fourth column section (224); A second convex ring (211) is provided on the inner side of the outer end of the main valve seat (21), the middle part of the second convex ring (211) is a fluid channel, and the diameter of the cross section of the second convex ring (211) is smaller than the diameter of the cross section of the third column section (223); the second convex ring (211) contacts the inner end surface of the first column section (221) to form a sealing pair; an annular spring groove (212) is provided on the main valve seat (21) along the axial direction, and the spring groove (212) is embedded in the shell of the main valve seat (21); a main spring (213) is built in the spring groove (212), one end of the main spring (213) is arranged in the spring groove (212), and the other end is limited to the outer end of the first convex ring (226); The main valve seat (21) is evenly distributed with at least two second medium inlets (214) along the radial direction, and the sum of the flow areas of the second medium inlets (214) is greater than the flow area of ​​the fluid channel in the middle of the second convex ring (211); The two auxiliary valve mounting holes (12) are symmetrically arranged at two axial ends of the valve body (1), and a first channel (16) is provided between the two auxiliary valve mounting holes (12) on the same axis, and the first channel (16) is radially connected to an air inlet (17); A second channel (15) communicating with each other is provided between each main valve installation hole (11) and a secondary valve installation hole (12) adjacent to or close to the main valve installation hole (11). The valve body (1) is provided with an outlet (20) connected to the medium outlet (14); there are two outlets (20), and two main valves (2) located on the coaxial side of the central axis of the valve body (1) share the same outlet (20) through the medium outlet (14).

2. The gas-controlled high-pressure variable flow control valve according to claim 1, characterized in that: An annular groove (225) is provided on the circumferential outer side of the third column section (223) of the main valve core (22), and a sealing ring is built into the annular groove (225); A first cavity (23) is formed between the inner end surface of the fourth column section (224) of the main valve core (22) and the inner wall surface of the main valve installation hole (11).

3. A gas-controlled high-pressure variable flow control valve according to claim 1 or 2, characterized in that: The auxiliary valve (3) comprises an auxiliary valve housing (31), a coil assembly (32), and an auxiliary valve seat (33), an auxiliary valve core (34) and an auxiliary spring (35) which are sequentially arranged on the inner side of the coil assembly (32) from the inside to the outside along the axial direction; a third channel (18) and an exhaust channel (36) are respectively arranged at two axial ends of the auxiliary valve (3); the third channel (18) passes through the auxiliary valve seat (33) and is connected to the first channel (16); the flow area of ​​the exhaust channel (36) is larger than the flow area of ​​the third channel (18) at one end close to the auxiliary valve core (34); The auxiliary valve core (34) is provided with a groove along the axial direction on the outer circumference thereof, and a second cavity (37) is formed between the groove, the auxiliary valve housing (31) and the auxiliary valve seat (33), and the second cavity (37) connects the two ends of the auxiliary valve core (34); A plurality of fourth channels (19) are provided in the auxiliary valve seat (33), and the angle between each of the fourth channels (19) and the axis of the auxiliary valve seat (33) is φ, and φ is 60-75°; one end of the fourth channel (19) is located close to the auxiliary valve core (34), and the other end connects the adjacent auxiliary valve mounting hole (12) with the main valve mounting hole (11) through the second channel (15).

4. The gas-controlled high-pressure variable flow control valve according to claim 3, characterized in that: A third convex ring (331) is provided at the circumferential middle of the auxiliary valve seat (33), and an adjusting gasket (332) is provided between the side of the third convex ring (331) close to the auxiliary valve core (34) and the auxiliary valve housing (31); A third cavity (38) is formed between the side of the third convex ring (331) away from the auxiliary valve core (34), the auxiliary valve housing (31) and the inner wall surface of the auxiliary valve mounting hole (12), and the third cavity (38) is connected to the second channel (15) and the fourth channel (19).

5. The gas-controlled high-pressure variable flow control valve according to claim 4, characterized in that: A first sealing block (341) and a second sealing block (342) are respectively provided at two axial ends of the auxiliary valve core (34).

6. The gas-controlled high-pressure variable flow control valve according to claim 5, characterized in that: A filter screen (39) is also provided at the entrance of the third channel (18).

7. The gas-controlled high-pressure variable flow control valve according to claim 6, characterized in that: The number of the fourth channels (19) is 4-10.

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