A combination valve, attitude and orbit control power system and propellant control method

Abstract

The present invention discloses a combination valve, an attitude and orbit control power system and a propellant control method. The combination valve includes a valve body, an electric explosion valve assembly, an electric explosion tube assembly, a self-locking pneumatic control valve assembly, a throttling orifice plate and a pressure sensor. The propellant is blocked and opened by the electric explosion valve assembly, and the corresponding channel is opened and closed by controlling the self-locking pneumatic control valve assembly to realize the flow supply of different thrust engines. The valve front flow resistance of the engine with different flow requirements in the corresponding channel can be coordinated by the throttling orifice plate, and the pressure in the pipeline when the system is working can be monitored in real time by the pressure sensor. The present invention is installed in the outlet pipeline of the diaphragm tank of the attitude and orbit control power system, and is used to control the on and off of the propellant medium, realize the supply of multiple tanks, and ensure that the engine thrust is basically consistent when multiple thrust engines are working. Furthermore, the combination valve of the present invention has the characteristics of high degree of integration, compact structure, small size, light weight, ability to realize different flow supply and high flow control accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of attitude and orbit control power system and valve, and in particular relates to a liquid circuit combination valve and application thereof in an attitude and orbit control power system. Background Art

[0002] When the attitude and orbit control power system is installed on rockets and weapon systems, it is necessary to control the on and off of the propellant in the tank through valves during the pre-packaging (propellant has been filled) storage, pre-launch preparation, and flight stages. During pre-packaging (propellant has been filled) storage, the system propellant is stored in a diaphragm tank and isolated from the system downstream through an isolation valve (compatible with the first level of propellant); before launch, the diaphragm tank is pressurized upstream, the isolation valve opens automatically, the system downstream is filled with propellant, and the system flight preparation is completed; during the flight stage, the system opens different valves according to the control instructions and delivers propellant to the engine at different flow rates to enable the engine to work normally.

[0003] With the continuous development of the aerospace field, the system propellant filling amount and the number of tanks have increased (conventional systems use one tank for one propellant), the engine thrust has become larger and larger, the types and numbers of engines have increased, and single or multiple engines work in alternating combinations. Therefore, the flow deviation in the system propulsion supply process is large, which leads to large engine thrust deviation, thus affecting the control accuracy of the attitude and orbit control system.

[0004] Based on the above reasons, it is urgent to design a liquid circuit combination valve that has the function of an isolation valve and can be opened at a fixed time according to instructions to provide propellant supply to the downstream. At the same time, the liquid circuit combination valve has the function of regulating the flow when multiple tanks are supplied. Furthermore, the liquid circuit combination valve integrates a self-locking switch valve, which has the function of cutting off or opening the downstream propellant supply, and reserves judgment time for the system working conditions. In addition, the liquid circuit combination valve highly integrates valves with different functions, greatly reducing the system interfaces and simplifying the pipeline layout. Summary of the invention

[0005] In order to solve the above problems, the present invention aims to provide a combination valve, an attitude and orbit control power system and a propellant control method. The combination valve is installed in the outlet pipeline of the diaphragm tank of the attitude and orbit control power system to control the on and off of the propellant medium, so as to realize the supply of multiple tanks and ensure that the thrust of the engines is basically the same when multiple thrust engines are working. Furthermore, the liquid circuit combination valve has the characteristics of high degree of integration, compact structure, small size, light weight, ability to realize different flow supply and high flow control accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A combination valve, comprising:

[0008] Valve body;

[0009] The valve body is provided with a control gas inlet, at least two first medium inlets, at least two second medium inlets, a plurality of sensor interfaces, a first medium outlet and a second medium outlet;

[0010] The valve body is provided with a first medium inflow channel, a second medium inflow channel, a first medium collecting channel and a second medium collecting channel, the first medium inflow channels are equal in number to the first medium inlets and are connected one by one, the second medium inflow channels are equal in number to the second medium inlets and are connected one by one, the number of the first medium collecting channel and the second medium collecting channel are both one and are connected to the first medium outlet and the second medium outlet, respectively, the first medium inflow channel and the first medium collecting channel are connected through a plurality of parallel first medium shunt channels, the second medium inflow channel and the second medium collecting channel are connected through a plurality of parallel second medium shunt channels, and the number of the first medium shunt channels and the second medium shunt channels are equal;

[0011] An electric explosion valve assembly, which is arranged in the first medium inflow channel and the second medium inflow channel, and is used to control the blocking and flow of the first medium and the second medium in the first medium inflow channel and the second medium inflow channel respectively, at least two of the electric explosion valve assemblies are integrated on the valve body, and an electric explosion pipe interface is arranged on the valve body;

[0012] An electric squib assembly, wherein the electric squib assembly is detachably connected to the electric squib valve assembly via an electric squib interface;

[0013] A self-locking pneumatic control valve assembly, the self-locking pneumatic control valve assembly is used to control the circulation or blocking of a first medium in a first medium shunt channel, and the circulation or blocking of a second medium in a second medium shunt channel, at least two of the self-locking pneumatic control valve assemblies are integrated on a valve body, each of the self-locking pneumatic control valve assemblies includes a pilot solenoid valve, and the pilot solenoid valve simultaneously controls one of a plurality of parallel first medium shunt channels corresponding to each first medium inflow channel, and one of a plurality of parallel second medium shunt channels corresponding to each second medium inflow channel;

[0014] A throttle orifice plate, the throttle orifice plate is used to coordinate the flow resistance of the first medium and the second medium in the first medium shunt channel and the second medium shunt channel at different flow rates, and the throttle orifice plate is installed in each of the first medium shunt channel and the second medium shunt channel after the electric explosion valve assembly and before the pilot solenoid valve in the self-locking pneumatic control valve assembly;

[0015] The pressure sensor is installed in the sensor interface of the valve body and is used to monitor the pre-valve pressure of the pilot solenoid valve, the working state of the electric explosion valve assembly, or the pressure of the first medium inflow channel and the second medium inflow channel in the valve body.

[0016] As an option, the electric explosion valve assembly includes a blind tube, a cutter and a sealing ring, and when an electric explosion valve assembly includes multiple blind tubes and a cutter, the cutter can cut through multiple blind tubes at the same time.

[0017] As an option, the pilot valve in the pilot-operated solenoid valve is communicated with the control air inlet on the valve body.

[0018] As an option, the pilot solenoid valve is a normally closed two-position pilot solenoid valve.

[0019] As an option, the electric squib assembly is a double-bridge low-charge electric squib.

[0020] An attitude and orbit control power system comprises any one of the above-mentioned combination valves, and each first medium inlet of the combination valve is connected to a fuel tank, and each second medium inlet of the combination valve is connected to an oxidant tank.

[0021] A method for controlling propellant of an attitude and orbit control power system adopts the above attitude and orbit control power system and comprises:

[0022] Switching of flow conditions, the switching of flow conditions controls the opening and closing numbers of the first medium diversion channel and the second medium diversion channel by changing the working states of different self-locking pneumatic control valve components in the combination valve. When the opening numbers of the first medium diversion channel and the second medium diversion channel increase, the flow rates of the first medium outlet and the second medium outlet increase. When the opening numbers of the first medium diversion channel and the second medium diversion channel decrease, the flow rates of the first medium outlet and the second medium outlet decrease, thereby realizing flow supply for different thrust engines.

[0023] Furthermore, by adjusting the specifications of the throttling orifice plate, the flow resistances in the first medium shunt channel and the second medium shunt channel are made the same, thereby achieving proportional flow switching of flow conditions.

[0024] Furthermore, by adjusting the specifications of the throttling orifice plate, the flow resistances in the first medium flow diversion channel and the second medium flow diversion channel are different, thereby achieving non-proportional flow switching of flow conditions.

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

[0026] (1) It has the function of an isolation valve and can be opened at a fixed time according to instructions to provide propellant supply to the downstream;

[0027] (2) It has the function of regulating the flow rate when supplying from multiple tanks, and regulates the flow rate by controlling the number of self-locking pneumatic control valves opened (using throttling orifices of different specifications to match the flow rates of different channels to the desired flow resistance in advance, so that when different numbers of channels are opened with self-locking pneumatic control valves, the flow rate regulation can be basically consistent and in line with expectations, reducing flow deviation);

[0028] (3) Integrated self-locking switch valve, which can cut off or open the downstream propellant supply, and reserve time for judging the system working condition;

[0029] (4) The combination valve can be matched with different numbers of tanks and self-locking pneumatic control valve components to meet the needs of different occasions or working conditions;

[0030] (5) The combination valve integrates multiple valves with different functions, greatly reduces the number of system interfaces, and simplifies the piping layout, thereby achieving a high degree of integration, compact structure, small size, light weight, and the ability to supply different flow rates with high flow control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the working principle diagram of the hydraulic circuit combination valve of a two-component engine;

[0032] Figure 2 It is the structure and interface diagram of the hydraulic circuit combination valve of the two-component engine;

[0033] In the figure, 1-valve body; 2-electric explosion valve assembly; 3-self-locking pneumatic control valve assembly; 4-control gas inlet; 5-fuel tank inlet; 6-oxidizer tank inlet; 7-fuel outlet; 8-oxidizer outlet; 9-sensor interface; 10-fuel end electric explosion tube interface; 11-oxidizer end electric explosion tube interface; 12-oxidizer tank; 13-fuel tank; 14-electric explosion tube assembly; 15-throttling orifice; 16-pressure sensor. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0035] like Figure 1 and 2As shown, the hydraulic circuit combination valve in the attitude and orbit control power system is composed of a valve body 1, an electric explosion valve assembly 2, an electric explosion tube assembly 14, a self-locking pneumatic control valve assembly 3, a throttling orifice 15, and a pressure sensor 16. The propellant is blocked and opened by the electric explosion valve assembly 2, and the corresponding channels (the first medium shunt channel and the second medium shunt channel) are opened and closed by controlling the self-locking pneumatic control valve assembly 3 to realize the flow supply of different thrust engines. The throttling orifice 15 is used to coordinate the valve front flow resistance of the corresponding channel engine with different flow requirements, and the pressure sensor 16 can monitor the pressure in the pipeline in real time when the system is working.

[0036] like Figure 1 The solid line portion shows a dual-component attitude and orbit control power system provided in an embodiment of the present invention, which is suitable for four tanks (two oxidizer tanks 12 and two fuel tanks 13) and two flow conditions (two flow modes, all first medium shunt channels and second medium shunt channels are fully open, and half of the first medium shunt channels and second medium shunt channels are open). When the flow condition or the tank increases or the flow condition and the tank increase at the same time, the first medium shunt channel, the second medium shunt channel and the self-locking pneumatic control valve assembly 3 (for example, Figure 1 The double-dotted line corresponds to the component) to meet the function, and the specific implementation is as follows:

[0037] like Figure 1 In the solid line part, when four tanks (two oxidant tanks 12 and two fuel tanks 13) and two flow operating system are required, two first medium inflow channels (oxidant channels) are designed to be connected to the two oxidant tanks 12 respectively, two second medium inflow channels (fuel channels) are connected to the two fuel tanks 13 respectively, a first medium collecting channel (oxidant channel) and a second medium collecting channel (fuel channel), each first medium inflow channel is connected to a blind pipe in the electric explosion valve assembly 2, each first medium inflow channel is split into two mutually parallel first medium diversion channels, and then the two mutually parallel first medium diversion channels are connected to the first medium collecting channel; similarly, each second medium inflow channel is connected to a blind pipe in the electric explosion valve assembly 2, each second medium inflow channel is split into two mutually parallel second medium diversion channels, and then the two mutually parallel second medium diversion channels are connected to the second medium collecting channel. A throttling orifice plate 15 is provided in each first medium diversion channel and the second medium diversion channel. The self-locking pneumatic control valve assembly 3 has two ( Figure 1The two self-locking pneumatic control valve assemblies 3 on the left and right sides drawn by the solid line in the middle), the pilot solenoid valve in each self-locking pneumatic control valve assembly 3 simultaneously controls the on-off of four medium diversion flows (two first medium diversion channels and two second medium diversion channels), so when the pilot solenoid valve in one of the self-locking pneumatic control valve assemblies 3 is opened and the pilot solenoid valve in the other self-locking pneumatic control valve assembly 3 is closed, the two first medium diversion channels and the two second medium diversion channels are all opened, realizing the first flow condition; when the flow needs to be increased, the pilot solenoid valves in the two self-locking pneumatic control valve assemblies 3 are all in the open state, the four first medium diversion channels and the four second medium diversion channels are all opened, realizing the second flow condition (doubling the flow). The pressure sensor 16 is installed between the first (second) medium inflow channel and the first (second) medium diversion channel. There are two electric explosion valve assemblies 2, each of which includes two blind pipes. There are two electric explosion tube assemblies 14, and one electric explosion tube assembly 14 can cut through the two blind pipes in the same electric explosion valve assembly 2.

[0038] like Figure 1 When six tanks (three oxidant tanks 12 and three fuel tanks 13) and two flow conditions are required, three first medium inflow channels (oxidant channels) are respectively connected to the three oxidant tanks 12, three second medium inflow channels (fuel channels) are respectively connected to the three fuel tanks 13, one first medium collecting channel (oxidant channel) and one second medium collecting channel (fuel channel) are designed. Each first medium inflow channel is connected to a blind pipe in the electric explosion valve assembly 2, and each first medium inflow channel is split into two mutually parallel first medium diversion channels, and then the two mutually parallel first medium diversion channels are connected to the first medium collecting channel; similarly, each second medium inflow channel is connected to a blind pipe in the electric explosion valve assembly 2, and each second medium inflow channel is split into two mutually parallel second medium diversion channels, and then the two mutually parallel second medium diversion channels are connected to the second medium collecting channel. A throttling orifice plate 15 is provided in each first medium diversion channel and the second medium diversion channel. The self-locking pneumatic control valve assembly 3 has two ( Figure 1The two self-locking pneumatic control valve assemblies 3 on the left and right sides drawn by the solid line), the pilot solenoid valve in each self-locking pneumatic control valve assembly 3 simultaneously controls the on-off of six medium diversion flows (three first medium diversion channels and three second medium diversion channels), so when the pilot solenoid valve in one of the self-locking pneumatic control valve assemblies 3 is opened and the pilot solenoid valve in the other self-locking pneumatic control valve assembly 3 is closed, the three first medium diversion channels and the three second medium diversion channels are all opened, realizing the first flow condition; when the flow needs to be increased, the pilot solenoid valves in the two self-locking pneumatic control valve assemblies 3 are both in the open state, the six first medium diversion channels and the six second medium diversion channels are all opened, realizing the second flow condition;

[0039] like Figure 1 When six tanks (three oxidant tanks 12 and three fuel tanks 13) and a three-flow operating system are required, three first medium inflow channels (oxidant channels) are designed to be connected to the three oxidant tanks 12 respectively, three second medium inflow channels (fuel channels) are connected to the three fuel tanks 13 respectively, one first medium collecting channel (oxidant channel) and one second medium collecting channel (fuel channel), each first medium inflow channel is connected to a blind pipe in the electric explosion valve assembly 2, each first medium inflow channel is split into three mutually parallel first medium diversion channels, and then the three mutually parallel first medium diversion channels are all connected to the first medium collecting channel; similarly, each second medium inflow channel is connected to a blind pipe in the electric explosion valve assembly 2, each second medium inflow channel is split into three mutually parallel second medium diversion channels, and then the three mutually parallel second medium diversion channels are all connected to the second medium collecting channel. A throttling orifice plate 15 is provided in each first medium diversion channel and the second medium diversion channel. The self-locking pneumatic control valve assembly 3 has three ( Figure 1The two self-locking pneumatic control valve assemblies 3 on the left and right sides drawn by the solid line and the two dotted lines in the middle) are each pilot solenoid valve in the self-locking pneumatic control valve assembly 3. Each pilot solenoid valve in the self-locking pneumatic control valve assembly 3 controls the on-off of six medium diversion channels (three first medium diversion channels and three second medium diversion channels). Therefore, when the pilot solenoid valve in one of the self-locking pneumatic control valve assemblies 3 is opened and the pilot solenoid valves in the other two self-locking pneumatic control valve assemblies 3 are closed, the three first medium diversion channels and the three second medium diversion channels are all closed. When the flow rate needs to be increased, the pilot solenoid valves in the two self-locking pneumatic control valve assemblies 3 are all in the open state, and the six first medium diversion channels and the six second medium diversion channels are all open, realizing the second flow rate condition (double flow rate); when the flow rate needs to be opened to the maximum, the pilot solenoid valves in the three self-locking pneumatic control valve assemblies 3 are all in the open state, and the nine first medium diversion channels and the nine second medium diversion channels are all open, realizing the third flow rate condition (triple flow rate). In this solution, there are three blind pipes in an electric explosion valve assembly 2, and a cutter cuts through the three blind pipes at the same time when it is actuated.

[0040] In the above three solutions, the throttling orifice plate 15 is used to adjust the flow resistance in all the first medium flow diversion channels and the second medium flow diversion channels to be consistent, thereby reducing flow deviation and achieving proportional flow regulation.

[0041] like Figure 2 As shown, it is a solid model of the liquid circuit combination valve in the attitude and orbit control power system (four tanks, two flow conditions), including a valve body 1, on which there is a control gas inlet 4, two fuel inlets (fuel tank inlet 5), two oxidant inlets (oxidant tank inlet 6), two electric explosion valve components 2, two electric explosion tube interfaces (a fuel end electric explosion tube interface 10, an oxidant end electric explosion tube interface 11), four throttling orifices 15 for fuel channels, four throttling orifices 15 for oxidant channels, a fuel outlet 7, an oxidant outlet 8 and four sensor interfaces 9. All components on the combination valve are connected and installed on the valve body 1.

[0042] There are two electric explosion valve assemblies 2, namely an oxygen electric explosion valve assembly and a fuel electric explosion valve assembly. Each electric explosion valve assembly 2 is composed of a blind pipe, a cutter, and a sealing ring. One cutter of the electric explosion valve assembly 2 can cut two blind pipes at the same time, and can control the opening of two channels (medium inflow channels). Therefore, the two electric explosion valve assemblies 2 can control the opening of four channels (medium inflow channels).

[0043] There are two electric squib assemblies 14, which are installed and connected to the electric squib interface of the electric squib valve assembly 2. The electric squib assembly 14 is a double-bridge low-charge electric squib with a sudden sense, which has a small impact after electric explosion and high reliability.

[0044] There are two self-locking pneumatic control valve assemblies 3, which are installed and connected to the valve body 1. Figure 2 The self-locking pneumatic control valve assembly 3 is a pilot-operated two-position solenoid valve, which consists of a pilot valve and a main valve. It requires the simultaneous introduction of control gas and pulse electric signals to work. The self-locking pneumatic control valve assembly 3 is in a normally closed state when not working; when working, the control gas is introduced and a pulse electric signal is applied, and the valve opens; the valve has the ability to self-maintain its mechanical position under no-electricity conditions, and the valve will not close until it is powered on again. By controlling the number of openings of the self-locking pneumatic control valve assembly 3, the engine can work under different flow conditions, and the system pipeline flow resistance is kept basically consistent through the throttling orifice 15, thereby ensuring that the engine thrust remains basically unchanged.

[0045] There are eight throttling orifice plates 15. Before the system is installed, the aperture of the throttling orifice plate 5 is adjusted to make the flow resistance of the combination valve consistent under different flow conditions. The throttling orifice plate 15 is installed in the medium diversion channel behind the electric explosion valve assembly 2 and before the self-locking pneumatic control valve assembly 3 (a total of 8 medium diversion channels).

[0046] There are four pressure sensors 16 installed and connected to the sensor interface 9 of the valve body 1. They are used to monitor the valve front pressure of the pilot two-position solenoid valve in the self-locking pneumatic control valve assembly 3. They can also be used to determine whether the pipeline pressure is normal after the electric explosion valve assembly 2 is working and when the system is working.

[0047] The basic working principle of the liquid circuit combination valve is:

[0048] like Figure 1 As shown, before the system works, the propellants in the oxidizer tank 12 and the fuel tank 13 are blocked in the blind pipe of the electric squib assembly 2, and the control air delivered by the system pressure reducing valve flows into the control air inlet 4 of the combination valve and reaches the pilot two-position solenoid valve of the self-locking pneumatic control valve assembly 3. At this time, the value displayed by the pressure sensor 16 is zero.

[0049] When the attitude and orbit control power system is working, pulse electric signals are applied to the oxygen electric squib assembly and the fuel electric squib assembly at the same time. After the electric squib assembly 2 is exploded, high-pressure gas is generated to push the cutter to cut through the blind pipe. The channels of the electric squib assembly 2 are all open. At this time, the pressure sensor 16 displays the propellant pressure value in the channel. A pulse electric signal is applied to the self-locking pneumatic control valve assembly 3, and the self-locking pneumatic control valve assembly 3 opens different medium diversion channels as required. The oxidizer propellant and the fuel propellant flow out from the oxidizer outlet 8 and the fuel outlet 7 respectively after passing through the medium collection channel at a certain flow rate as required, thereby achieving the purpose of controlling the flow rate; at the same time, when the attitude and orbit control power system is interpreted or troubleshooting, all medium diversion channels can be closed through the self-locking pneumatic control valve assembly 3 to cut off the propellant supply.

Claims

1. A combination valve, Features: include, Valve body (1); The valve body (1) is provided with a control gas inlet (4), at least two first medium inlets, at least two second medium inlets, a plurality of sensor interfaces (9), a first medium outlet and a second medium outlet; The valve body (1) is provided with a first medium inflow channel, a second medium inflow channel, a first medium collecting channel and a second medium collecting channel, the first medium inflow channels are equal in number to the first medium inlets and are connected one by one, the second medium inflow channels are equal in number to the second medium inlets and are connected one by one, the first medium collecting channel and the second medium collecting channel are both one in number and are connected to the first medium outlet and the second medium outlet respectively, the first medium inflow channel and the first medium collecting channel are connected via a plurality of parallel first medium shunt channels, the second medium inflow channel and the second medium collecting channel are connected via a plurality of parallel second medium shunt channels, and the number of the first medium shunt channels and the second medium shunt channels are equal; An electric explosion valve assembly (2), the electric explosion valve assembly (2) being arranged in a first medium inflow channel and a second medium inflow channel, and being used to control the blocking and flow of the first medium and the second medium in the first medium inflow channel and the second medium inflow channel, respectively; at least two of the electric explosion valve assemblies (2) are integrated on the valve body (1), and an electric explosion pipe interface is arranged on the valve body (1); An electric squib assembly (14), wherein the electric squib assembly (14) is detachably connected to the electric squib valve assembly (2) via an electric squib interface; A self-locking pneumatic control valve assembly (3), the self-locking pneumatic control valve assembly (3) is used to control the flow or blocking of a first medium in a first medium shunt channel, and the flow or blocking of a second medium in a second medium shunt channel, at least two of the self-locking pneumatic control valve assemblies (3) are integrated on the valve body (1), each of the self-locking pneumatic control valve assemblies (3) comprises a pilot solenoid valve, and the pilot solenoid valve simultaneously controls one of the plurality of parallel first medium shunt channels corresponding to each first medium inflow channel, and one of the plurality of parallel second medium shunt channels corresponding to each second medium inflow channel; A throttle orifice plate (15), the throttle orifice plate (15) being used to coordinate the flow resistance of the first medium and the second medium in the first medium shunt channel and the second medium shunt channel at different flow rates, the throttle orifice plate (15) being installed in each of the first medium shunt channel and the second medium shunt channel after the electric explosion valve assembly (2) and before the pilot solenoid valve in the self-locking pneumatic control valve assembly (3); A pressure sensor (16) is installed in a sensor interface (9) of a valve body (1) and is used to monitor the pressure before the pilot solenoid valve, the working state of the electric explosion valve assembly (2), or the pressure of a first medium inflow channel and a second medium inflow channel in the valve body (1).

2. A combination valve according to claim 1, Features: The electric explosion valve assembly (2) comprises a blind tube, a cutter and a sealing ring, and when one electric explosion valve assembly (2) comprises a plurality of blind tubes and a cutter, the cutter can simultaneously cut through the plurality of blind tubes in one action.

3. A combination valve according to claim 1, Features: The pilot valve in the pilot-operated solenoid valve is in communication with a control air inlet (4) on the valve body (1).

4. A combination valve according to claim 1, Features: The pilot solenoid valve is a normally closed two-position pilot solenoid valve.

5. A combination valve according to claim 1, Features: The electric squib assembly (14) is a double-bridge low-charge electric squib with a sudden induction.

6. An attitude and orbit control power system, Features: The attitude and orbit control power system comprises any one of the combination valves of claims 1 to 5, and each first medium inlet of the combination valve is connected to a fuel tank, and each second medium inlet of the combination valve is connected to an oxidant tank.

7. A propellant control method for an attitude and orbit control power system, Features: The attitude and orbit control power system of claim 6 is adopted, and includes: Switching of flow conditions, wherein the switching of flow conditions controls the number of openings and closings of the first medium diversion channel and the second medium diversion channel by changing the working states of different self-locking pneumatic control valve components (3) in the combination valve; when the number of openings of the first medium diversion channel and the second medium diversion channel increases, the flow rates of the first medium outlet and the second medium outlet increase; and when the number of openings of the first medium diversion channel and the second medium diversion channel decreases, the flow rates of the first medium outlet and the second medium outlet decrease, thereby realizing flow supply for engines with different thrusts.

8. A method for controlling propellant of an attitude and orbit control power system according to claim 7, Features: By adjusting the specifications of the throttling orifice plate (15), the flow resistance in the first medium flow diversion channel and the second medium flow diversion channel are made the same, thereby achieving proportional flow switching of flow conditions.

9. A method for controlling propellant of an attitude and orbit control power system according to claim 7, Features: By adjusting the specifications of the throttling orifice plate (15), the flow resistances in the first medium flow diversion channel and the second medium flow diversion channel are different, thereby achieving non-proportional flow switching of flow conditions.

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