Pneumatic control loop for nozzle load simulation

Abstract

The invention relates to the technical field of rocket engine nozzle test, and particularly discloses a pneumatic control loop for nozzle load simulation, which comprises a servo control loop, a manual control loop, an electric control pressure regulating valve control loop, a master control valve and a master controller, the electric control pressure regulating valve control loop comprises a second pressure regulating valve and an electronic pressure controller, the main controller provides working air pressure for the electronic pressure controller by controlling the second pressure regulating valve, and the electronic pressure controller controls the opening degree of the first pressure regulating valve. High-pressure gas output by a gas source enters a servo control loop or a manual control loop through a master control valve and then is input into an action cavity to simulate friction torque borne by a rocket engine jet pipe, and a semi-physical simulation experiment on the jet pipe is achieved; and the gap between the valve element and the valve seat in the first pressure regulating valve is controlled, so that the opening degree of the valve is accurately controlled, and a larger pressure regulating range is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of rocket engine nozzle testing, and in particular to a pneumatic control circuit for nozzle load simulation. Background Art

[0002] The nozzle is a crucial component of a rocket engine. Installing a servo mechanism on a rocket engine nozzle allows for nozzle swing control, significantly determining the rocket's flight attitude. During flight, the loads overcome by the servo mechanism to propel the nozzle's swing include friction torque and aerodynamic compound torque. In ground-based hardware-in-the-loop simulation experiments, hydraulic load simulation systems are typically used to simulate the friction torque acting on the nozzle. While hydraulic load simulation systems offer superior accuracy, stiffness, and dynamic performance, they carry higher costs and maintenance requirements. Compared to hydraulic load simulation systems, pneumatic load simulation systems offer the advantage of faster operation and are gaining popularity among a growing number of companies.

[0003] Whether it is a hydraulic load simulation system or a pneumatic load simulation system, the most important thing is to accurately control the valve core position to achieve a larger adjustment range and more precise control. However, the control loop structure in the existing pneumatic load simulation system is relatively complex, and it is easy to affect the experimental results due to improper operation during the experiment. In addition, the complex structure also leads to high experimental costs. Based on the above problems, how to simplify the control loop structure of the pneumatic load simulation system and ensure the control effect is an urgent problem to be solved. Summary of the Invention

[0004] In view of the technical problems in the prior art, the present invention provides a pneumatic control circuit for nozzle load simulation.

[0005] The present invention provides a pneumatic control circuit for nozzle load simulation, comprising a servo control circuit, a manual control circuit, a master control valve, and a master controller. The gas inputs of the servo control circuit and the manual control circuit are both connected to the output of the master control valve, and the gas outputs of the servo control circuit and the manual control circuit are both connected to an actuating chamber. The gas input of the master control valve is connected to a gas source, and the master controller is electrically connected to the master control valve.

[0006] The servo control circuit includes a first pressure regulating valve; a gas input end of the first pressure regulating valve is connected to an output end of the master control valve via a gas pipeline, and a gas output end of the first pressure regulating valve is connected to the actuating chamber via a gas pipeline;

[0007] The manual control circuit includes a manual pressure regulating valve; the gas input end of the manual pressure regulating valve is connected to the output end of the master control valve through a gas pipeline, and the gas output end of the manual pressure regulating valve is connected to the action chamber through a gas pipeline;

[0008] The pneumatic control circuit also includes an electronically controlled pressure-regulating valve control circuit, which includes a second pressure-regulating valve and an electronic pressure controller; the second pressure-regulating valve is electrically connected to the main controller; the gas input end of the second pressure-regulating valve is connected to the input end or output end of the main control valve through a gas pipeline, the gas output end of the second pressure-regulating valve is connected to the gas input end of the electronic pressure controller through a gas pipeline, and the gas output end of the electronic pressure controller is connected to the pilot port of the first pressure-regulating valve through a gas pipeline; the main controller provides working air pressure to the electronic pressure controller by controlling the second pressure-regulating valve; and the electronic pressure controller controls the opening of the first pressure-regulating valve.

[0009] Furthermore, the servo control loop also includes a first pressure relief valve, a first pressure relief branch is provided on the gas supply pipeline from the gas output end of the first pressure regulating valve to the action chamber, and the first pressure relief valve is installed on the first pressure relief branch; the first pressure relief valve is electrically connected to the main controller.

[0010] Furthermore, the manual control circuit also includes a second pressure relief valve, a second pressure relief branch is provided on the gas pipeline from the gas output end of the manual pressure regulating valve to the action chamber, and the second pressure relief valve is installed on the second pressure relief branch.

[0011] Furthermore, the servo control loop also includes a first plug group, which is arranged on the gas supply pipeline connecting the gas output end of the first pressure regulating valve and the action chamber, and when the first plug group is in a plugged state, the gas supply pipeline from the gas output end of the first pressure regulating valve to the action chamber is connected, and when the first plug group is in a disconnected state, the gas supply pipeline from the gas output end of the first pressure regulating valve to the action chamber is cut off.

[0012] Furthermore, the manual control circuit also includes a second plug group, which is arranged on the gas supply pipeline connecting the gas output end of the manual pressure regulating valve and the action chamber, and when the second plug group is in the plugged state, the gas supply pipeline from the gas output end of the manual pressure regulating valve to the action chamber is connected, and when the second plug group is in the disconnected state, the gas supply pipeline from the gas output end of the manual pressure regulating valve to the action chamber is cut off.

[0013] Furthermore, the servo control loop also includes a first pressure detector, which is installed at the connection between the gas output end of the first pressure regulating valve and the gas supply pipeline to the action chamber and the first pressure relief branch; the first pressure detector is electrically connected to the electronic pressure controller, and the electronic pressure controller controls the opening of the first pressure regulating valve according to the pressure detection value of the first pressure detector.

[0014] Furthermore, the manual control circuit also includes a second pressure detector, which is installed on the gas transmission pipeline between the gas output end of the manual pressure regulating valve and the second pressure relief branch.

[0015] Furthermore, the electronically controlled pressure regulating valve control circuit also includes a third pressure detector, which is installed on the gas supply pipeline from the second pressure regulating valve to the electronic pressure controller; the third pressure detector is electrically connected to the main controller, and the main controller controls the opening of the second pressure regulating valve through the pressure detection value of the third pressure detector.

[0016] Furthermore, the pneumatic control circuit also includes a fourth pressure detector, which is installed on the gas pipeline connecting the gas input end of the master control valve and the gas source; the fourth pressure detector is electrically connected to the master controller.

[0017] A pneumatic control circuit for nozzle load simulation according to the present invention includes a servo control circuit, a manual control circuit, a master control valve, and a master controller. The gas inputs of the servo control circuit and the manual control circuit are both connected to the output of the master control valve, and the gas outputs of the servo control circuit and the manual control circuit are both connected to an actuating chamber. The gas input of the master control valve is connected to a gas source. High-pressure gas output by the gas source enters the servo control circuit and / or the manual control circuit through the master control valve and is then input into the actuating chamber, thereby simulating the friction torque applied to a rocket engine nozzle and implementing a semi-physical simulation experiment of the rocket engine nozzle. Compared with hydraulic load simulation systems, the circuit has the advantages of faster operation and simplified circuit design, reduced experimental costs, and reliable control compared to existing pneumatic load simulation systems. The servo control circuit includes a first pressure regulating valve, the valve opening of which is controlled by an electronically controlled pressure regulating valve control circuit, thereby achieving electronic control of the servo control circuit. Manual control can also be achieved by adjusting the manual pressure regulating valve in the manual control circuit, thereby better meeting different experimental requirements.

[0018] In addition, the gas input end of the second pressure regulating valve in the control loop of the electronically controlled pressure regulating valve is connected to the input end or output end of the main control valve through a gas supply pipeline, and the gas output end is connected to the gas input end of the electronic pressure controller through a gas supply pipeline, and the gas output end of the electronic pressure controller is connected to the pilot port of the first pressure regulating valve through a gas supply pipeline. The main controller provides working air pressure to the electronic pressure controller by controlling the second pressure regulating valve, and the electronic pressure controller acts as a pilot valve to control the gap between the valve core and the valve seat in the first pressure regulating valve, thereby realizing control of the opening of the first pressure regulating valve. The present invention controls the output pressure of the electronic pressure controller by air pressure in a wider pressure range, thereby realizing precise control of the valve opening and achieving a larger pressure regulation range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of a nozzle load simulation test according to an embodiment of the present invention;

[0021] Figure 2 A structural diagram of a pneumatic control circuit for nozzle load simulation according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic structural diagram of a pneumatic control circuit for nozzle load simulation according to another embodiment of the present invention;

[0023] Among them, 1-servo mechanism, 2-action chamber, 3-swing center, 4-nozzle, 5-air source, 100-pneumatic control circuit, 101-servo control circuit, 1011-first pressure regulating valve, 1012-first pressure relief valve, 1013-first plug group, 1014-first pressure detector, 102-manual control circuit, 1021-manual pressure regulating valve, 1022-second pressure relief valve, 1023-second plug group, 1024-second pressure detector, 103-master control valve, 104-electrically controlled pressure regulating valve control circuit, 1041-second pressure regulating valve, 1042-electronic pressure controller, 1043-third pressure detector, 105-fourth pressure detector. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] In the servo mechanism semi-physical simulation experiment, Figure 1 As shown, as the servo mechanism propels the nozzle around its center of rotation, it fills the actuating chamber with an appropriate amount of gas. As the nozzle swings, it squeezes the actuating chamber and rubs against it, generating frictional force to simulate the frictional torque acting on the nozzle. The present invention simulates the frictional torque acting on the nozzle through a pneumatic control circuit. Load simulation is transformed from the existing hydraulic method to a pneumatic mode, increasing the versatility of load simulation control and reducing costs. This invention develops a pneumatic control circuit for nozzle load simulation, focusing on the pressure supply and control of the gas within the actuating chamber.

[0026] Specifically, an embodiment of the present invention provides a nozzle load simulation pneumatic control circuit, such as Figure 2 As shown, the pneumatic control circuit 100 includes a servo control circuit 101, a manual control circuit 102, a master control valve 103, and a master controller (not shown in the figure). The gas input ends of the servo control circuit 101 and the manual control circuit 102 are both connected to the output end of the master control valve 103, and the gas output ends of the servo control circuit 101 and the manual control circuit 102 are both connected to the action chamber 2. The gas input end of the master control valve 103 is connected to the gas source 5, and the master controller is electrically connected to the master control valve 103; wherein:

[0027] The servo control circuit 101 includes a first pressure regulating valve 1011; the gas input end of the first pressure regulating valve 1011 is connected to the output end of the master control valve 103 through a gas pipeline, and the gas output end of the first pressure regulating valve 1011 is connected to the action chamber 2 through a gas pipeline;

[0028] The manual control circuit 102 includes a manual pressure regulating valve 1021; the gas input end of the manual pressure regulating valve 1021 is connected to the output end of the master control valve 103 through a gas pipeline, and the gas output end of the manual pressure regulating valve 1021 is connected to the action chamber 2 through a gas pipeline;

[0029] The pneumatic control circuit 100 also includes an electronically controlled pressure-regulating valve control circuit 104, which includes a second pressure-regulating valve 1041 and an electronic pressure controller 1042; the second pressure-regulating valve 1041 is electrically connected to the main controller; the gas input end of the second pressure-regulating valve 1041 is connected to the input end or output end of the main control valve 103 through a gas pipeline, the gas output end of the second pressure-regulating valve 1041 is connected to the gas input end of the electronic pressure controller 1042 through a gas pipeline, and the gas output end of the electronic pressure controller 1042 is connected to the pilot port of the first pressure-regulating valve 1011 through a gas pipeline; the main controller provides working air pressure to the electronic pressure controller 1042 by controlling the second pressure-regulating valve 1041; the electronic pressure controller 1042 controls the opening of the first pressure-regulating valve 1011.

[0030] In the embodiment of the present invention, the master control valve 103 is used to control the flow of air between the air source 5 and the servo control circuit 101 and the manual control return circuit 102. Therefore, a two-way valve can be used to achieve this function. The specific control principle and product model are not limited in this embodiment of the present invention. When the master control valve 103 is open, if the first pressure regulating valve 1011 is open, the servo control circuit 101 is connected. If the manual pressure regulating valve 1021 is open, the manual control circuit 102 is connected. By controlling the states of the master control valve 103, the first pressure regulating valve 1011, and the manual pressure regulating valve 1021, it is possible to control the flow of a single control circuit (the servo control circuit 101 or the manual control circuit 102) or to simultaneously connect and disconnect two control circuits (the servo control circuit 101 and the manual control circuit 102). This meets experimental requirements, simplifies the circuit structure, and reduces costs.

[0031] When performing a nozzle load simulation test, the manual control circuit 102 is used as follows:

[0032] The gas in the gas source 5 enters the manual control circuit 102 through the main control valve 103. The test personnel manually adjust the manual pressure regulating valve 1021 to control the pressure of the gas delivered to the action chamber 2 by the manual pressure regulating valve 1021, thereby completing the manual intake of gas in the action chamber 2.

[0033] When performing the nozzle load simulation test, the servo control loop 101 is used as follows:

[0034] The gas in the gas source 5 enters the servo control circuit 101 through the main control valve 103, and also enters the electronically controlled pressure regulating valve control circuit 104. Since the opening of the first pressure regulating valve 1011 determines the pressure of the gas delivered to the action chamber 2, the opening of the second pressure regulating valve 1041 is first controlled so that the gas pressure output by the second pressure regulating valve 1041 can be maintained stable and reach the working pressure of the electronic pressure controller 1042, providing the electronic pressure controller 1042 with working air pressure. The electronic pressure controller 1042 relies on this The air pressure enters the working state; the electronic pressure controller 1042 serves as a pilot valve, and its outlet is connected to the pilot port of the first pressure regulating valve 1011. By controlling the output pressure of the electronic pressure controller 1042, precise control of the main valve core of the first pressure regulating valve 1011 can be achieved (adjusting the gap between the valve core and the valve seat), so that the opening of the first pressure regulating valve 1011 meets the test requirements, and the first pressure regulating valve 1011 delivers gas pressure to the action chamber 2, completing the gas intake in the action chamber 2, and also has a larger pressure control range.

[0035] like Figure 2 and 3As shown, these two implementations correspond to the gas input end of the second pressure regulating valve 1041 being connected to the input end and the output end of the master control valve 103 through the gas pipeline; Figure 2 In the illustrated embodiment, the gas input of the second pressure regulating valve 1041 is directly connected to the gas source 5. Since the gas pressure output by the gas source 5 is relatively high, the gas source 5 can directly provide a wide range of gas pressures for the second pressure regulating valve 1041, thus reducing intermediate links, improving the system response speed, and meeting the working requirements of the electronic pressure controller 1042. Figure 3 In the manner shown, the gas input end of the second pressure regulating valve 1041 is connected to the gas output end of the main control valve 103. Since the gas output by the gas source 5 flows out through the main control valve 103, the air pressure range will be relatively limited, so the response speed will also be reduced. Therefore, in this implementation method, a main control valve 103 with greater fluid capacity and smaller pressure loss is selected, and a pressure stabilizing device is added between the main control valve 103 and the second pressure regulating valve 1041 to reduce pressure fluctuations, and the test effect will be better.

[0036] Preferably, in this embodiment, the servo control loop 101 and the manual control loop 102 are not used simultaneously during the test. The servo control loop 101 is an electric control loop, which is easier and more accurate to operate and is a more commonly used control loop.

[0037] In an embodiment of the present invention, the action chamber 2 must reach the target pressure value through the air source 5 and the pneumatic control circuit of this embodiment before it can meet the semi-physical simulation experiment of the servo mechanism, and the opening of the first pressure regulating valve 1011 and the manual pressure regulating valve 1021 determines the inflation process of the action chamber 2. Taking the control process of the servo control loop 101 as an example, the adjustment of the opening of the first pressure regulating valve 1011 during the inflation process of the action chamber 2 should be divided into at least two stages. In the first stage, the opening of the first pressure regulating valve 1011 is the largest. The largest opening does not mean that the valve is fully open, but that the opening ratio during the inflation process is the maximum. In this stage, the pressure difference between the gas source and the action chamber 2 can be used to achieve rapid inflation, thereby shortening the inflation time. In the second stage, the opening of the first pressure regulating valve 1011 will be gradually reduced to reduce the flow rate of the inflation gas and avoid overshoot. In this stage, the main controller is required to control the opening of the second pressure regulating valve 1041 to provide working air pressure for the electronic pressure controller 1042. The output pressure of the electronic pressure controller 1042 is continuously adjusted to control the opening of the first pressure regulating valve 1011 to be reduced, and the reduction of the opening of the first pressure regulating valve 1011 is nonlinear. As a preferred method, for the adjustment of the opening of the first pressure regulating valve 1011, the following calculation formula will be constructed based on the PID control principle to determine the adjustment parameters:

[0038]

[0039] in, It belongs to the first stage, Belongs to the second stage; is the set value, based on the target pressure value of the action chamber 2 and the target pressure value of the gas source 5 , the pipe diameter and the length of the pipeline are measured and determined; The PID calculation model includes proportional term, integral term and differential term. It is a function of time t and valve opening A of the first pressure regulating valve 1011. The proportional gain value, integral gain value and differential gain value included in it are obtained through multiple experimental adjustments. In addition, the measured value P of the output pressure of the gas source 5 and the target pressure value of the gas source 5 are also added. The correction coefficient related to the two is obtained by Calculate, when the measured value Less than target value When the correction coefficient is greater than 1, it is equivalent to adjusting the opening of the first pressure regulating valve 1011 larger than normal. Greater than target value When the correction coefficient is less than 1, it is equivalent to adjusting the opening of the first pressure regulating valve 1011 to be smaller than normal to reduce the influence of the actual output pressure of the gas source 5 on the inflation process.

[0040] Whether the action chamber 2 is inflated through the servo control circuit 101 or the manual control circuit 102, when the action chamber 2 needs to be depressurized, the connection between the gas source 5 and the main control valve 103 can be designed to be disconnectable, allowing the gas to be released in the opposite direction of the original transmission route. More preferably, the first pressure regulating valve 1011 uses an electrically controlled pressure regulating valve with a built-in pressure relief port, and pressure relief can be achieved by opening the pressure relief port. When the action chamber 2 needs emergency pressure relief, the servo control circuit 101 in the embodiment of the present invention also includes a first pressure relief valve 1012. A first pressure relief branch is provided on the gas pipeline from the gas output end of the first pressure regulating valve 1011 to the action chamber 2. The first pressure relief valve 1012 is installed on the first pressure relief branch. The first pressure relief valve 1012 is electrically connected to the main controller, and the main controller controls the state of the first pressure relief valve 1012, and emergency pressure relief is achieved when it is opened. The first pressure relief valve 1012 in this embodiment can be an electric ball valve, and the specific product specifications are not limited.

[0041] Furthermore, the manual control circuit 102 in this embodiment may also include a second pressure relief valve 1022. A second pressure relief branch is provided on the gas pipeline from the gas output end of the manual pressure regulating valve 1021 to the actuating chamber 2, and the second pressure relief valve 1022 is mounted on this second pressure relief branch. In this embodiment, the second pressure relief valve 1022 is a manually adjustable valve. When gas is supplied to the actuating chamber 2 via the manual control circuit 102, the pressure in the actuating chamber 2 can be relieved by manually adjusting the state of the second pressure relief valve 1022.

[0042] Specifically, the servo control loop 101 also includes a first plug group 1013, which is arranged on the gas supply pipeline connecting the gas output end of the first pressure regulating valve 1011 and the action chamber 2, and when the first plug group 1013 is in a plugged-in state, the gas supply pipeline from the gas output end of the first pressure regulating valve 1011 to the action chamber 2 is connected, and when the first plug group 1013 is in a disconnected state, the gas supply pipeline from the gas output end of the first pressure regulating valve 1011 to the action chamber 2 is cut off.

[0043] Specifically, the manual control circuit 102 also includes a second plug group 1023, which is arranged on the gas supply pipeline connecting the gas output end of the manual pressure regulating valve 1021 and the action chamber 2, and when the second plug group 1023 is in a plugged-in state, the gas supply pipeline from the gas output end of the manual pressure regulating valve 1021 to the action chamber 2 is connected, and when the second plug group 1023 is in a disconnected state, the gas supply pipeline from the gas output end of the manual pressure regulating valve 1021 to the action chamber 2 is cut off.

[0044] In the embodiment of the present invention, a first plug group 1013 and a second plug group 1023 are provided, and the gas circuit between the servo control circuit 101 and the manual control circuit 102 and the actuating chamber 2 can be opened and closed by manually plugging and unplugging. The structural details of the first plug group 1013 and the second plug group 1023 in this embodiment are not specifically limited. As an example, a structure including a female plug a and a male plug b can be selected. When the female and male plugs are connected, the gas circuit is connected, and when the male and female plugs are disconnected, the gas circuit is disconnected. The design of the first plug group 1013 and the second plug group 1023 realizes the rapid opening and closing operation of the gas transmission line. After the gas is output from the gas source and enters the main control valve 103, it passes through the gas transmission pipeline, passes through the first pressure regulating valve 1011 or the manual pressure regulating valve 1021, and then passes through the first plug group 1013 or the second plug group 1023 to enter the actuating chamber 2, completing the automatic air supply of the actuating chamber 2.

[0045] Specifically, in this embodiment of the present invention, the servo control circuit 101 further includes a first pressure detector 1014, which is installed at the junction of the gas supply pipeline from the gas output end of the first pressure regulating valve 1011 to the actuating chamber 2 and the first pressure relief branch. The first pressure detector 1014 monitors the gas pressure entering the actuating chamber 2 in real time. If the pressure detection value is lower than a set value, the electronic pressure controller 1042 outputs a signal to increase the opening of the first pressure regulating valve 1011, thereby increasing the gas pressure within the pipeline. If the pressure detection value is higher than the set value, the electronic pressure controller 1042 outputs a signal to decrease the opening of the first pressure regulating valve 1011, thereby reducing the gas pressure within the pipeline. In this embodiment, the first pressure detector 1014 is electrically connected to the electronic pressure controller 1042. The electronic pressure controller 1042 uses the gas pressure entering the actuating chamber 2 as a reference for its determination of the gas pressure of the first pressure regulating valve 1011. The electronic pressure controller 1042 controls the opening of the first pressure regulating valve 1011 based on the pressure detection value of the first pressure detector 1014, thereby achieving closed-loop control and further ensuring the stability and safety of the gas transmission process. In this embodiment, a pressure sensor may be used to measure the gas pressure and upload the signal, and the specific product type of the sensor is not limited.

[0046] Specifically, the manual control circuit 102 further includes a second pressure detector 1024, which is installed on the gas pipeline between the gas output end of the manual pressure regulating valve 1021 and the second pressure relief branch. In this embodiment, the second pressure detector 1024 is preferably a pressure gauge. When manually adjusting the opening of the manual pressure regulating valve 1021 to adjust the gas pressure, the tester operates the manual pressure regulating valve 1021 by observing the pressure gauge display.

[0047] Specifically, the electronically controlled pressure-regulating valve control circuit 104 in this embodiment of the present invention further includes a third pressure detector 1043, which is installed on the gas pipeline from the second pressure-regulating valve 1041 to the electronic pressure controller 1042. The third pressure detector 1043 is electrically connected to the master controller, which controls the opening of the second pressure-regulating valve 1041 based on the pressure detected by the third pressure detector 1043. Because the electronic pressure controller 1042 requires gas input as a driving pressure signal source, the third pressure detector 1043 is installed at the output of the second pressure-regulating valve 1041, and its pressure detection value serves as a reference for controlling the opening of the second pressure-regulating valve 1041.

[0048] Specifically, the pneumatic control circuit 100 in the embodiment of the present invention also includes a fourth pressure detector 105, which is installed on the gas pipeline connecting the gas input end of the master control valve 103 and the gas source 5; the fourth pressure detector 105 is electrically connected to the master controller. The fourth pressure detector 105 is used to measure the pressure of the gas output by the gas source 5. The master controller can monitor the detection value of the fourth pressure detector 105 and shut off the master control valve 103 if it does not meet the test requirements, or adjust the opening size of the master control valve 103 according to the detection value of the fourth pressure detector 105 to achieve the gas pressure required by the test. The fourth pressure detector 105 in this embodiment can use a pressure gauge to visualize the detection value on site.

[0049] It should be noted that the main controller in the embodiment of the present invention has the functions of obtaining information and controlling certain equipment states according to the set program, and the electronic pressure controller 1042 also has the functions of obtaining information and controlling equipment states. These two components can be integrated into one product or independently set up and implemented according to the product model selection, both of which fall within the scope of protection of the present invention.

[0050] A pneumatic control circuit for nozzle load simulation according to an embodiment of the present invention includes a servo control circuit, a manual control circuit, a master control valve, and a master controller. The gas inputs of the servo control circuit and the manual control circuit are both connected to the output of the master control valve, and the gas outputs of the servo control circuit and the manual control circuit are both connected to an actuating chamber. The gas input of the master control valve is connected to a gas source. High-pressure gas output by the gas source enters the servo control circuit and / or the manual control circuit through the master control valve and is then input into the actuating chamber. This circuit simulates the friction torque experienced by a rocket engine nozzle and implements a semi-physical simulation experiment of the rocket engine nozzle. Compared to hydraulic load simulation systems, this circuit has the advantages of faster operation and, compared to existing pneumatic load simulation systems, simplified circuit design, reduced experimental costs, and reliable control. The servo control circuit includes a first pressure regulating valve, the valve opening of which is controlled by an electronically controlled pressure regulating valve control circuit, thereby achieving electronic control of the servo control circuit. Manual control can also be achieved by adjusting the manual pressure regulating valve in the manual control circuit, better meeting different experimental requirements.

[0051] In addition, in the control circuit of the electrically controlled pressure-regulating valve in the embodiment of the present invention, the gas input end of the second pressure-regulating valve is connected to the input end or the output end of the main control valve through a gas pipeline, and the gas output end is connected to the gas input end of the electronic pressure controller through a gas pipeline. The gas output end of the electronic pressure controller is connected to the pilot port of the first pressure-regulating valve through a gas pipeline. The main controller provides working air pressure to the electronic pressure controller by controlling the second pressure-regulating valve. The electronic pressure controller acts as a pilot valve to control the gap between the valve core and the valve seat in the first pressure-regulating valve, thereby controlling the opening of the first pressure-regulating valve. The present invention controls the output pressure of the electronic pressure controller by air pressure in a wider pressure range, thereby achieving precise control of the valve opening and achieving a larger pressure regulation range.

[0052] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A pneumatic control circuit for nozzle load simulation, characterized in that: The pneumatic control circuit includes a servo control circuit, a manual control circuit, a master control valve, and a master controller. The gas input ends of the servo control circuit and the manual control circuit are both connected to the output end of the master control valve, and the gas output ends of the servo control circuit and the manual control circuit are both connected to the action chamber. The gas input end of the master control valve is connected to a gas source, and the master controller is electrically connected to the master control valve. The servo control circuit includes a first pressure regulating valve; a gas input end of the first pressure regulating valve is connected to an output end of the master control valve via a gas pipeline, and a gas output end of the first pressure regulating valve is connected to the actuating chamber via a gas pipeline; The manual control circuit includes a manual pressure regulating valve; the gas input end of the manual pressure regulating valve is connected to the output end of the master control valve through a gas pipeline, and the gas output end of the manual pressure regulating valve is connected to the action chamber through a gas pipeline; The pneumatic control circuit also includes an electronically controlled pressure-regulating valve control circuit, which includes a second pressure-regulating valve and an electronic pressure controller; the second pressure-regulating valve is electrically connected to the main controller; the gas input end of the second pressure-regulating valve is connected to the input end or output end of the main control valve through a gas pipeline, the gas output end of the second pressure-regulating valve is connected to the gas input end of the electronic pressure controller through a gas pipeline, and the gas output end of the electronic pressure controller is connected to the pilot port of the first pressure-regulating valve through a gas pipeline; the main controller provides working air pressure to the electronic pressure controller by controlling the second pressure-regulating valve; and the electronic pressure controller controls the opening of the first pressure-regulating valve.

2. A pneumatic control circuit for nozzle load simulation according to claim 1, characterized in that: The servo control loop also includes a first pressure relief valve. A first pressure relief branch is provided on the gas pipeline from the gas output end of the first pressure regulating valve to the actuating chamber. The first pressure relief valve is installed on the first pressure relief branch. The first pressure relief valve is electrically connected to the main controller.

3. A pneumatic control circuit for nozzle load simulation according to claim 1, characterized in that: The manual control circuit also includes a second pressure relief valve. A second pressure relief branch is provided on the gas pipeline from the gas output end of the manual pressure regulating valve to the action chamber, and the second pressure relief valve is installed on the second pressure relief branch.

4. A pneumatic control circuit for nozzle load simulation according to claim 1, characterized in that: The servo control loop also includes a first plug group, which is arranged on the gas supply pipeline connecting the gas output end of the first pressure regulating valve and the actuating chamber. When the first plug group is in a plugged state, the gas supply pipeline from the gas output end of the first pressure regulating valve to the actuating chamber is connected. When the first plug group is in a disconnected state, the gas supply pipeline from the gas output end of the first pressure regulating valve to the actuating chamber is cut off.

5. The pneumatic control circuit for nozzle load simulation according to claim 1, characterized in that: The manual control circuit also includes a second plug group, which is arranged on the gas supply pipeline connecting the gas output end of the manual pressure regulating valve and the actuating chamber. When the second plug group is in a plugged-in state, the gas supply pipeline from the gas output end of the manual pressure regulating valve to the actuating chamber is connected. When the second plug group is in a disconnected state, the gas supply pipeline from the gas output end of the manual pressure regulating valve to the actuating chamber is cut off.

6. A pneumatic control circuit for nozzle load simulation according to claim 2, characterized in that: The servo control circuit further includes a first pressure detector, which is installed at the connection between the gas output end of the first pressure regulating valve and the gas pipeline of the actuating chamber and the first pressure relief branch; The first pressure detector is electrically connected to the electronic pressure controller, and the electronic pressure controller controls the opening of the first pressure regulating valve according to the pressure detection value of the first pressure detector.

7. A pneumatic control circuit for nozzle load simulation according to claim 2, characterized in that: The manual control circuit further includes a second pressure detector, which is installed on the gas transmission pipeline between the gas output end of the manual pressure regulating valve and the second pressure relief branch.

8. The pneumatic control circuit for nozzle load simulation according to claim 1, characterized in that: The electronically controlled pressure regulating valve control circuit also includes a third pressure detector, which is installed on the gas transmission pipeline from the second pressure regulating valve to the electronic pressure controller; the third pressure detector is electrically connected to the main controller, and the main controller controls the opening of the second pressure regulating valve through the pressure detection value of the third pressure detector.

9. The pneumatic control circuit for nozzle load simulation according to claim 1, characterized in that: The pneumatic control circuit further includes a fourth pressure detector, which is installed on a gas pipeline connecting the gas input end of the master control valve and the gas source; the fourth pressure detector is electrically connected to the master controller.

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