Assembly and testing method and system for high-pressure electromagnetic valves for aerospace applications

Abstract

The present invention provides an assembly test method and system for aerospace-specific high-pressure electromagnetic valves, including: testing whether the electric variables and magnetic variables of the high-pressure electromagnetic valve meet preset requirements; wherein the electric variable test includes: before the test, alternately pulse power supply to the open coil and the closed coil once, using the electromagnetic valve electric variable test equipment to measure and record the electric waveform, and judge the electric variable; then respectively change different power supply voltages and repeat the above steps; the magnetic variable measurement includes: before assembling the coil assembly, using a fluxmeter to measure, placing the magnetized sample in the uniform magnetic field area of ​​the measuring coil assembly, the sample placement direction is perpendicular to the Helmholtz coil, restoring the zero point of the integrator, and then pulling the sample out of the coil assembly, until the distance of the sample is pulled out until the coupling effect with the measuring coil can be ignored, and the maximum reading of the flux integrator is the magnetic flux of the coil assembly. The present invention solves the problem of low qualified rate of high-pressure electromagnetic valve assembly test.

Description

Technical Field

[0001] The present invention relates to the technical field of assembly and testing of high-pressure electromagnetic valves, and in particular to an assembly and testing method and system for a high-pressure electromagnetic valve dedicated to aerospace. Background Art

[0002] The high-pressure solenoid valve is the core unit in the launch vehicle's booster delivery system. Its main function is to open and close by receiving electrical signals during the rocket's flight to achieve the connection and disconnection between the high-pressure helium in the booster helium cylinder group and the tank, thereby stabilizing the tank pressure.

[0003] The existing new generation of launch vehicle high pressure solenoid valve is a load-unloading structure, and its structural diagram is shown in Figure 1 , including: electromagnet, armature, push rod, valve body, load-reducing valve, spring, valve seat, main valve, nozzle and other components. The traditional assembly test method often adopts the method of assembly, debugging, reliability verification failure, disassembly, reassembly and debugging. The operation is relatively cumbersome and the pass rate of one-time assembly test is low. The main reasons are: the depth of the stop indentation at the load-reducing valve is insufficient, resulting in the sealing pair being unable to fully meet the sealing pressure ratio requirements; after the assembly is completed, during the subsequent product testing, the push rod repeatedly hits the hard core of the load-reducing valve, resulting in a slight depression at the hard core of the load-reducing valve, the C stroke exceeds the required range, and the product performance is reduced.

[0004] At present, the production cycle of a single batch of high-pressure solenoid valves is 1 month, and the assembly test and rework time account for about 50% of the entire production cycle. The pass rate of a single assembly test is low, which seriously restricts the overall development and production progress of space launch vehicles.

[0005] At present, this type of high-pressure solenoid valve has been used in multiple models of launch vehicles, with an annual output of hundreds of pieces. The production task is heavy and the time node is tight. With the continuous development of the new generation of launch vehicles, higher requirements are placed on the reliability of the high-pressure solenoid valve. Relying on traditional assembly and testing methods can no longer meet the production task requirements. It is urgent to propose an accurate and efficient high-pressure solenoid valve assembly and testing method on the basis of ensuring the key characteristics of the high-pressure solenoid valve. Summary of the invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide an assembly and testing method and system for aerospace-specific high-pressure electromagnetic valves.

[0007] The assembly and testing method of the aerospace-specific high-pressure electromagnetic valve provided by the present invention comprises:

[0008] Step 1: Assemble all parts of the high-pressure solenoid valve in the preset order, measure and adjust the stroke parameters, and build the high-pressure solenoid valve test pipeline and circuit;

[0009] Step 2: Test whether the electrical variables and magnetic variables of the high-voltage solenoid valve meet the preset requirements;

[0010] The electrical variable test includes: before the test, alternately pulse power supply to the open coil and the closed coil once, use the solenoid valve electrical variable test equipment to measure and record the electrical waveform, and interpret the electrical variable; then change the power supply voltage to different levels and repeat the above steps;

[0011] The magnetic variable measurement includes: before assembling the coil assembly, using a fluxmeter to measure, placing the magnetized sample in the uniform magnetic field area of ​​the measuring coil assembly, with the sample placed perpendicular to the Helmholtz coil, restoring the zero point of the integrator, and then pulling the sample out of the coil assembly until the coupling effect with the measuring coil is negligible. The maximum reading of the flux integrator is the magnetic flux of the coil assembly.

[0012] Preferably, before assembly, all parts sealing, fitting and guiding parts are inspected for defects, all metal parts are soaked in aviation washing gasoline, degreased with a degreaser, and then manually cleaned, and finally cleaned with an ultrasonic cleaning machine with built-in filtering function and anhydrous ethanol.

[0013] Preferably, the step 1 comprises:

[0014] Put the spring, load-reducing valve and valve seat in the upper part of the valve body in turn, install the electromagnet on the valve body, connect and tighten the electromagnet and the valve body through a circle of four evenly distributed studs and nuts, cover and press the spring, load-reducing valve and valve seat, and then put the push rod and armature in the electromagnet. The armature is provided with a screw. Adjust the height of the screw to roughly adjust the C stroke of the solenoid valve, and cover it with the screw cover provided by the electromagnet. The C stroke here refers to the maximum distance that the electromagnet pushes the armature to move when the solenoid valve is powered on and opened. The C stroke of the solenoid valve meets 0.3mm~0.6mm;

[0015] When the electromagnetic head iron moves, the push rod is pushed against the hard core of the load-reducing valve to pre-press the hard core of the load-reducing valve, so that the hard core of the load-reducing valve forms a depression. Then, the pre-pressing tool is used to pre-press the sealing surface of the load-reducing valve and measure the depth, so that the sealing surface of the load-reducing valve forms a stop indentation of a preset size;

[0016] Place a large spring and main valve at the bottom of the valve body, and use a special lifting assembly tool to screw in the pipe nozzle so that the sealing surface of the main valve does not touch the pipe nozzle during the assembly process. The pipe nozzle is screwed into the valve body through a threaded connection to assemble a high-pressure solenoid valve. Use a depth gauge to measure and adjust the C stroke by adjusting the screw to meet 0.3mm~0.4mm;

[0017] Access the high-pressure gas source through a metal pipeline, fill the compressed gas into the inlet of the high-pressure solenoid valve through a manual shut-off valve and a pressure gauge, and use a cable to connect the voltage-stabilized power supply to the electrical plug of the high-pressure solenoid valve.

[0018] Preferably, a working voltage of 24V~30V is used, and the power is turned on repeatedly 50~100 times to pre-press the hard core of the unloading valve, so that a ball socket is formed at the hard core, and the deformation of the hard core is eliminated in advance; then a pre-pressing tool and a dial indicator are used to pre-press the sealing surface of the unloading valve to ensure that the stop depth is 0.06mm~0.08mm, forming a stop indentation.

[0019] Preferably, step 2 comprises:

[0020] The electric variable test includes: before the test, the closed coil is pulse-powered with 21V for 100ms to ensure that the armature is on the closed coil side, the open coil and the closed coil are pulse-powered once alternately, the power supply is 28V, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable; then the power supply voltage is changed to 28V, 31V, 21V, and 36V respectively, the open coil and the closed coil are pulse-powered once alternately, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable;

[0021] Magnetic variable measurement includes: before assembling the coil assembly, the measurement range is 0~2wb, the measurement accuracy is ±0.5%, and the high resolution is 0.1 Wb's TD8900 fluxmeter is used for measurement. The magnetized sample is placed in the uniform magnetic field of the measuring coil assembly. The sample is placed perpendicular to the Helmholtz coil. The zero point of the integrator is restored. Then the sample is pulled out of the coil assembly until the coupling effect with the measuring coil is negligible. The maximum reading of the flux integrator is the magnetic flux of the coil assembly.

[0022] It also includes the measurement of action time, air tightness, and resistance performance;

[0023] The action time test includes: when the pressure at the inlet of the high-pressure solenoid valve is 0Mpa, 1.5Mpa, and 36.5Mpa respectively, the high-pressure solenoid valve is energized to open and close the solenoid valve, and the electrical waveform display device is used to test the electrical waveform when the high-pressure solenoid valve is in action, and the opening and closing time of the high-pressure solenoid valve is observed, which is required to be less than 150 milliseconds;

[0024] The air tightness test includes: the inlet of the high-pressure solenoid valve is filled with 1.5Mpa, the air leakage at the load-reducing valve does not exceed 30 bubbles, the air leakage at the valve assembly and the nozzle does not exceed 90 bubbles, and the nozzle gasket is airtight; 36.5MPa compressed air is passed into the inlet, and the air tightness requirements at the load-reducing valve, the valve assembly and the nozzle, and the nozzle gasket are all airtight; the valve assembly at least includes the main valve;

[0025] The resistance performance test includes: using a multimeter to measure the resistance value of the internal coil of the high-voltage solenoid valve through the electrical plug contacts. When the temperature is 20℃~22℃, the resistance value is 17.2Ω±0.8Ω. Using an insulation resistance megohmmeter to measure the insulation resistance between the high-voltage solenoid valve coil and the shell, it is required to be greater than 100MΩ.

[0026] The assembly and testing system of aerospace-specific high-pressure electromagnetic valve provided by the present invention comprises:

[0027] Assembly module: Assemble all parts of the high-pressure solenoid valve in a preset order, measure and adjust the stroke parameters, and build the high-pressure solenoid valve test pipeline and circuit;

[0028] Test module: Test whether the electrical variables and magnetic variables of the high-voltage solenoid valve meet the preset requirements;

[0029] The electrical variable test includes: before the test, alternately pulse power supply to the open coil and the closed coil once, use the solenoid valve electrical variable test equipment to measure and record the electrical waveform, and interpret the electrical variable; then change the power supply voltage to different levels and repeat the above steps;

[0030] The magnetic variable measurement includes: before assembling the coil assembly, using a fluxmeter to measure, placing the magnetized sample in the uniform magnetic field area of ​​the measuring coil assembly, with the sample placed perpendicular to the Helmholtz coil, restoring the zero point of the integrator, and then pulling the sample out of the coil assembly until the coupling effect with the measuring coil is negligible. The maximum reading of the flux integrator is the magnetic flux of the coil assembly.

[0031] Preferably, before assembly, all parts sealing, fitting and guiding parts are inspected for defects, all metal parts are soaked in aviation washing gasoline, degreased with a degreaser, and then manually cleaned, and finally cleaned with an ultrasonic cleaning machine with built-in filtering function and anhydrous ethanol.

[0032] Preferably, the assembly module comprises:

[0033] Put the spring, load-reducing valve and valve seat in the upper part of the valve body in turn, install the electromagnet on the valve body, connect and tighten the electromagnet and the valve body through a circle of four evenly distributed studs and nuts, cover and press the spring, load-reducing valve and valve seat, and then put the push rod and armature in the electromagnet. The armature is provided with a screw. Adjust the height of the screw to roughly adjust the C stroke of the solenoid valve, and cover it with the screw cover provided by the electromagnet. The C stroke here refers to the maximum distance that the electromagnet pushes the armature to move when the solenoid valve is powered on and opened. The C stroke of the solenoid valve meets 0.3mm~0.6mm;

[0034] When the electromagnetic head iron moves, the push rod is pushed against the hard core of the load-reducing valve to pre-press the hard core of the load-reducing valve, so that the hard core of the load-reducing valve forms a depression. Then, the pre-pressing tool is used to pre-press the sealing surface of the load-reducing valve and measure the depth, so that the sealing surface of the load-reducing valve forms a stop indentation of a preset size;

[0035] Place a large spring and main valve at the bottom of the valve body, and use a special lifting assembly tool to screw in the pipe nozzle so that the sealing surface of the main valve does not touch the pipe nozzle during the assembly process. The pipe nozzle is screwed into the valve body through a threaded connection to assemble a high-pressure solenoid valve. Use a depth gauge to measure and adjust the C stroke by adjusting the screw to meet 0.3mm~0.4mm;

[0036] Access the high-pressure gas source through a metal pipeline, fill the compressed gas into the inlet of the high-pressure solenoid valve through a manual shut-off valve and a pressure gauge, and use a cable to connect the voltage-stabilized power supply to the electrical plug of the high-pressure solenoid valve.

[0037] Preferably, a working voltage of 24V~30V is used, and the power is turned on repeatedly 50~100 times to pre-press the hard core of the unloading valve, so that a ball socket is formed at the hard core, and the deformation of the hard core is eliminated in advance; then a pre-pressing tool and a dial indicator are used to pre-press the sealing surface of the unloading valve to ensure that the stop depth is 0.06mm~0.08mm, forming a stop indentation.

[0038] Preferably, the test module comprises:

[0039] The electric variable test includes: before the test, the closed coil is pulse-powered with 21V for 100ms to ensure that the armature is on the closed coil side, the open coil and the closed coil are pulse-powered once alternately, the power supply is 28V, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable; then the power supply voltage is changed to 28V, 31V, 21V, and 36V respectively, the open coil and the closed coil are pulse-powered once alternately, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable;

[0040] Magnetic variable measurement includes: before assembling the coil assembly, the measurement range is 0~2wb, the measurement accuracy is ±0.5%, and the high resolution is 0.1 Wb's TD8900 fluxmeter is used for measurement. The magnetized sample is placed in the uniform magnetic field of the measuring coil assembly. The sample is placed perpendicular to the Helmholtz coil. The zero point of the integrator is restored. Then the sample is pulled out of the coil assembly until the coupling effect with the measuring coil is negligible. The maximum reading of the flux integrator is the magnetic flux of the coil assembly.

[0041] It also includes the measurement of action time, air tightness, and resistance performance;

[0042] The action time test includes: when the pressure at the inlet of the high-pressure solenoid valve is 0Mpa, 1.5Mpa, and 36.5Mpa respectively, the high-pressure solenoid valve is energized to open and close the solenoid valve, and the electrical waveform display device is used to test the electrical waveform when the high-pressure solenoid valve is in action, and the opening and closing time of the high-pressure solenoid valve is observed, which is required to be less than 150 milliseconds;

[0043] The air tightness test includes: the inlet of the high-pressure solenoid valve is filled with 1.5Mpa, the air leakage at the load-reducing valve does not exceed 30 bubbles / min, the air leakage at the valve assembly and the nozzle does not exceed 90 bubbles / min, and the nozzle gasket is airtight; 36.5MPa compressed air is passed into the inlet, and the air tightness requirements at the load-reducing valve, the valve assembly and the nozzle, and the nozzle gasket are all airtight; the valve assembly at least includes the main valve;

[0044] The resistance performance test includes: using a multimeter to measure the resistance value of the internal coil of the high-voltage solenoid valve through the electrical plug contacts. When the temperature is 20℃~22℃, the resistance value is 17.2Ω±0.8Ω. Using an insulation resistance megohmmeter to measure the insulation resistance between the high-voltage solenoid valve coil and the shell, it is required to be greater than 100MΩ.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The present invention provides a high-pressure solenoid valve assembly and testing method to solve the problems of load-reducing valve leakage and stroke out-of-tolerance in traditional production methods; the assembly and testing process is implemented in steps, and the assembly and testing process includes a pre-assembly preparation stage, assembly components, pre-pressing and forming, assembly, and debugging and testing links. The method effectively improves the one-time assembly and test pass rate of the high-pressure solenoid valve, and has important engineering application value in the field of launch vehicle valve assembly tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0048] Figure 1 A schematic diagram of a high-pressure solenoid valve according to an embodiment of the present invention;

[0049] Figure 2 The load-reducing valve according to an embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the C stroke of an embodiment of the present invention;

[0051] Figure 4 A schematic diagram of a pre-pressure action circuit according to an embodiment of the present invention;

[0052] Figure 5 It is a schematic diagram of the equipment used for pre-pressing and forming the hard core of the load-reducing valve according to an embodiment of the present invention;

[0053] Figure 6 A cross-sectional view of the indentation of the stop of the load-reducing valve according to an embodiment of the present invention;

[0054] Figure 7 It is a schematic diagram of the pre-pressing forming of the stop indentation of the load-reducing valve according to an embodiment of the present invention;

[0055] Figure 8 A special jacking and assembly tool for an embodiment of the present invention;

[0056] Fig. 9 This is a schematic diagram of the main valve jacking assembly according to an embodiment of the present invention;

[0057] Fig.10 This is a schematic diagram of electrical connections of an embodiment of the present invention;

[0058] Fig.11 This is a flow chart of the high-pressure solenoid valve assembly and testing method of the present invention. DETAILED DESCRIPTION

[0059] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0060] Example

[0061] The present invention designs corresponding methods such as pre-assembly preparation stage, assembly components, pre-pressing molding, valve assembly, debugging test, reliability verification, etc., which solves the problem of high-pressure solenoid valve one-time assembly test pass rate. The steps are as follows:

[0062] 1) Ensure that all components meet the technical requirements and protect them during the circulation process to prevent scratches. 2) Non-metallic parts and springs must meet the same batch requirements. 3) Check the appearance of all components to ensure there are no flanges, burrs, rust, etc.

[0063] Specific implementation method Figure 2~Figure 10 The complete flow chart is shown in Fig.11 As shown, the high-pressure solenoid valve assembly test method provided by the preferred embodiment of the present invention comprises the following steps:

[0064] 1) Parts cleaning: Check each component to ensure there are no defects or rust, and ensure that all sealing parts are intact and free of scratches. All metal parts except the electromagnet must first be soaked in SH / T0114 aviation washing gasoline for 5 minutes, then manually cleaned, and finally cleaned with GB / T678 anhydrous ethanol using an ultrasonic cleaning machine with built-in filtering function. Check and ensure that the quality and specifications of the parts meet the requirements. Through step-by-step parts cleaning, it is ensured that the subsequent products will not be affected by excess materials, causing the internal moving parts of the product to get stuck or the product to leak.

[0065] 2) Assemble the components: Press on the upper part of the valve body 9 Figure 1 Put the spring 8, the load-reducing valve 7, and the valve seat 4 in sequence, install the electromagnet 1 on the valve body 9, and connect and tighten the electromagnet 1 and the valve body 9 through a circle of four evenly distributed studs 5 and nuts 6. Cover and press the spring 8, the load-reducing valve 7, and the valve seat 4, and then put the push rod 3 and the armature 2 in the electromagnet 1. The load-reducing valve 7 is as shown in FIG. Figure 2 .according to Figure 3 , a screw is provided in the armature, and the height of the screw 13 is adjusted to roughly adjust the C stroke of the solenoid valve to meet 0.3mm~0.6mm, and the screw cover 14 provided with the electromagnet 1 is used to cover it to ensure that the armature 2 and the push rod 3 cannot fall out. The C stroke here refers to the maximum distance that the electromagnet 1 pushes the armature 2 to move when the solenoid valve is powered on and opened, such as Figure 3 Here, the control of the C stroke only needs to meet the requirements of the solenoid valve opening.

[0066] 3) Pre-pressing: Use the highest working voltage of 27V and repeatedly power on 50 times. Figure 4 , pre-press the hard core of the load-reducing valve, such as Figure 7 . Decompose the components of step 1 according to Figure 5 , use a special preloading tool and a dial indicator to preload and measure the sealing surface of the load-reducing valve to ensure that the stopper depth is 0.06mm~0.08mm, forming a stopper indentation, such as Figure 6 , Figure 7The highest voltage is used to repeatedly energize 50 times, and the indentation of the unloading valve stop and the hard core are pre-pressed in advance, which can ensure the airtightness of the unloading valve in the subsequent debugging and testing steps, ensure that the C stroke will not change, and improve the qualification rate of the solenoid valve in the subsequent debugging and testing steps.

[0067] After verification by the bottom test, different stop depths were selected at intervals of 0.01mm, and when the inflation pressure was low pressure 1.5MPa, it was verified that when the stop depths were 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, and 0.10mm, the leakage of the unloading valve was 63 bubbles / min, 25 bubbles / min, 4 bubbles / min, 0 bubbles / min, 0 bubbles / min, 0 bubbles / min, 8 bubbles / min, and 15 bubbles / min respectively; when the inflation pressure was high pressure 36.5MPa, the sealing specific pressure was large, and there was no leakage when the stop depth was 0.03mm~0.10mm. It can be concluded that when the pre-pressure depth of the stop on the sealing surface of the unloading valve is too large or too small, there will be leakage when the sealing specific pressure is small under low pressure conditions, and the best air tightness is 0 bubbles / min when the depth value is in the range of 0.06mm~0.08mm.

[0068] 4) Assemble the valve: After the pre-pressing of the load-reducing valve is completed, reassemble the components according to step 1, and the upper part of the valve is assembled. Then put the large spring 11 and the main valve 10 in the lower part of the valve body 9, and use a special lifting assembly tool to screw in the nozzle 12, so that the sealing surface of the main valve 10 does not contact the nozzle 12 during the assembly process, to ensure the sealing performance of the main valve 10 of the product. Figure 8 , Fig. 9 , the nozzle 12 is screwed into the valve body 9 through a threaded connection to assemble a high-pressure solenoid valve, ensuring accuracy and stability during the assembly process. Figure 3 , by adjusting screw 13, use the depth gauge to measure and adjust the C stroke to meet the requirement of 0.3mm~0.4mm. The size of the C stroke determines whether the solenoid valve can open and close normally.

[0069] The smaller the C stroke, the greater the electromagnet suction. When the armature action drives the push rod to move and the C stroke is less than 0.3mm, the electromagnet suction increases, which increases the axial force on the push rod when the unloading valve opens to the maximum limit position, easily causing the push rod to bend and deform, and eventually leading to leakage of the unloading valve; when the armature action drives the push rod to move and the C stroke is greater than 0.4mm, the electromagnet suction is too small, and the unloading valve is delayed in opening or even cannot be opened when the high pressure is 36.5MPa.

[0070] 5) Electrical connection: To connect the electrical part of the solenoid valve, follow Fig.10, ensure that all lines are connected correctly. Access the high-pressure gas source through the metal pipeline, fill the compressed gas of a certain pressure into the inlet of the high-pressure solenoid valve through the manual stop valve and the pressure gauge, use a special cable to connect the voltage-stabilized power supply to the electrical plug of the high-pressure solenoid valve, and control the DC voltage at 21V~27V.

[0071] 6) Debugging test: Check the performance of the solenoid valve according to the predetermined test sequence to ensure that it meets the requirements, including start-up and closing time: ≤150ms; air tightness at the unloading valve and gasket: leakage does not exceed 90 bubbles / min; air tightness at the valve assembly and the nozzle: 1.5MPa compressed air is introduced into the inlet, and the leakage does not exceed 90 bubbles / min. 36.5MPa compressed air is introduced into the inlet, and there is no leakage; the air tightness at the nozzle gasket is no leakage; the starting voltage range is low voltage 21V and high voltage 27V; coil resistance check: at 20~22℃, R20=17.2±0.8Ω.

[0072] A startup and shutdown time of >150ms (design indicator) will result in a slow response of the armature action, causing a delay in the opening and closing time of the solenoid valve, ultimately affecting the response speed of the entire launch vehicle's booster delivery system performance.

[0073] Action time test: When the pressure at the inlet of the high-pressure solenoid valve is 0Mpa, 1.5Mpa, and 36.5Mpa respectively, the high-pressure solenoid valve is energized to open and close the solenoid valve, and the electrical waveform display device is used to test the electrical waveform of the high-pressure solenoid valve during operation, and the opening and closing time of the high-pressure solenoid valve is observed, which is required to be less than 150 milliseconds.

[0074] First, select 0Mpa without pressure to examine whether the electrical performance and action performance of the high-pressure solenoid valve meet the requirements. After verification, according to the performance requirements of the launch vehicle booster and delivery system, select low pressure 1.5Mpa and high pressure 36.5Mpa for single-machine test verification of the high-pressure solenoid valve. The low-pressure and high-pressure parameter values ​​cover the operating pressure range of the rocket booster and delivery system. If the single-machine test verification is qualified, it can meet the system operating conditions.

[0075] Air tightness test: 1.5Mpa is filled into the inlet of the high-pressure solenoid valve, the air leakage at the unloading valve does not exceed 30 bubbles / min, the air leakage at the valve assembly and the take-off nozzle does not exceed 90 bubbles / min, and there is no air leakage at the take-off nozzle gasket; 36.5MPa compressed air is passed into the inlet, and the air tightness at the unloading valve, the valve assembly and the take-off nozzle, and the take-off nozzle gasket are all required to be leak-free. The valve assembly includes at least the main valve.

[0076] The air leakage at the unloading valve shall not exceed 30 bubbles / min. If the air leakage is too high, it will cause pressure leakage in the gas cylinder of the carrier rocket's pressurization and delivery system, causing the gas cylinder pressure to be too low. The rocket tank cannot be pressurized during flight, resulting in a launch failure. The air leakage at the valve assembly and the connecting nozzle shall not exceed 90 bubbles / min. Leakage here will cause the gas in the gas cylinder to leak into the tank prematurely, which is equivalent to pressurizing the tank in advance, making the tank pressure too high and affecting the rocket flight.

[0077] Resistance performance test: Use a multimeter to measure the resistance value of the internal coil of the high-voltage solenoid valve through the electrical plug contacts. When the temperature is 20~22℃, the resistance value is 17.2±0.8Ω. Use an insulation resistance megohmmeter to measure the insulation resistance between the high-voltage solenoid valve coil and the shell, which is required to be greater than 100MΩ.

[0078] When the temperature is 20~22℃, the resistance value is 17.2±0.8Ω, which are the design performance requirements of the solenoid valve itself. As for the insulation resistance between the coil and the shell, when the resistance is less than 100MΩ, it is very easy to cause the coil and the shell to be conductive, causing leakage and affecting the rocket flight.

[0079] Electric variable test: Before the test, the closed coil is pulse-powered with 21V and 100ms to ensure that the armature is on the closed coil side. The open coil and the closed coil are pulse-powered once alternately with 28V and 100ms. The solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable. Then the power supply voltage is changed to 28V, 31V, 21V, and 36V respectively. The open coil and the closed coil are pulse-powered once alternately with 100ms. The solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable.

[0080] The power supply time of 100ms is selected to leave sufficient time for the armature to move. Generally, the longest armature movement time is within 70ms. If the power supply time is too short, the armature cannot complete the action and the solenoid valve cannot open. During the flight of the rocket, the voltage on the rocket gradually decreases. Because when the voltage is high, the electromagnet suction value is large, it is easy to cause the push rod to bend, causing the valve to leak. When the voltage is low, the electromagnet suction value is small, and the solenoid valve is delayed in opening or cannot be opened. Therefore, different working voltages are selected for testing to test the working performance of the solenoid valve under different voltage conditions.

[0081] Magnetic variable measurement: Before assembling the coil assembly, the measurement range is 0~2wb, the measurement accuracy is ±0.5%, and the high resolution is 0.1 Wb's TD8900 fluxmeter is used for measurement (inherent range of the test equipment). The magnetized sample is placed in the uniform magnetic field area of ​​the measuring coil assembly. The sample is placed perpendicular to the Helmholtz coil. The zero point of the integrator is restored, and then the sample is quickly pulled out of the coil assembly. The distance of the sample is pulled out until the coupling effect with the measuring coil is negligible. The maximum reading of the flux integrator is the magnetic flux of the coil assembly.

[0082] The various performances of the high-pressure solenoid valve are comprehensively tested through the action time, air tightness, resistance performance, electrical variables and magnetic variables tests, which solves the technical problem that the test results cannot be quantified, and verifies whether the assembled high-pressure solenoid valve meets various performance requirements. The test process of the electrical variables and magnetic variables of the solenoid valve is to test the suction force provided to the armature by the coil assembly of the electromagnet under different power supply voltages and pulse widths through different pressure states of the high-pressure solenoid valve inlet. The action response time and action law are displayed by the armature action phenomenon combined with the electrical waveform display device, and the action performance and working margin of the solenoid valve under different working conditions are simulated. The action performance and sealing performance of the solenoid valve under the comprehensive effects of spring force, ejector rod and friction of the load-reducing valve can be intuitively tested.

[0083] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0084] Those skilled in the art know that, in addition to implementing the system, device and its various modules provided by the present invention in a purely computer-readable program code, it is entirely possible to implement the same program in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded microcontrollers by logically programming the method steps. Therefore, the system, device and its various modules provided by the present invention can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures within the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing the method and structures within the hardware component.

[0085] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An assembly and testing method for aerospace-specific high-pressure electromagnetic valves, characterized in that: include: Step 1: Assemble all parts of the high-pressure solenoid valve in the preset order, measure and adjust the stroke parameters, and build the high-pressure solenoid valve test pipeline and circuit; Step 2: Test whether the electrical variables and magnetic variables of the high-voltage solenoid valve meet the preset requirements; The electric variable test includes: before the test, alternately pulse power supply once to the open coil and the closed coil, measure and record the electric waveform using the solenoid valve electric variable test equipment, and judge the electric variable; then change the different power supply voltages respectively and repeat the above steps; the open coil is the coil used to open the valve in the high-voltage solenoid valve, and the closed coil is the coil used to close the valve in the high-voltage solenoid valve; The magnetic variable measurement includes: before assembling the coil assembly, using a fluxmeter to measure, placing the magnetized sample in the uniform magnetic field area of ​​the measuring coil assembly, with the sample placement direction perpendicular to the Helmholtz coil, restoring the zero point of the integrator, and then pulling the sample out of the coil assembly until the coupling effect with the measuring coil is negligible, and the maximum reading of the flux integrator is the magnetic flux of the coil assembly; the Helmholtz coil is used to generate a uniform magnetic field in an area; The step 1 comprises: Put the spring, load-reducing valve and valve seat in the upper part of the valve body in turn, install the electromagnet on the valve body, connect and tighten the electromagnet and the valve body through a circle of four evenly distributed studs and nuts, cover and press the spring, load-reducing valve and valve seat, and then put the push rod and armature in the electromagnet. The armature is provided with a screw. Adjust the height of the screw to roughly adjust the C stroke of the solenoid valve, and cover it with the screw cover provided by the electromagnet. The C stroke here refers to the maximum distance that the electromagnet pushes the armature to move when the solenoid valve is powered on and opened. The C stroke of the solenoid valve meets 0.3mm~0.6mm; When the electromagnetic head iron moves, the push rod is pushed against the hard core of the load-reducing valve to pre-press the hard core of the load-reducing valve, so that the hard core of the load-reducing valve forms a depression. Then, the pre-pressing tool is used to pre-press the sealing surface of the load-reducing valve and measure the depth, so that the sealing surface of the load-reducing valve forms a stop indentation of a preset size; Place a large spring and main valve at the bottom of the valve body, and use a special lifting assembly tool to screw in the pipe nozzle so that the sealing surface of the main valve does not touch the pipe nozzle during the assembly process. The pipe nozzle is screwed into the valve body through a threaded connection to assemble a high-pressure solenoid valve. Use a depth gauge to measure and adjust the C stroke by adjusting the screw to meet 0.3mm~0.4mm; Access the high-pressure gas source through a metal pipeline, fill the compressed gas into the inlet of the high-pressure solenoid valve through a manual shut-off valve and a pressure gauge, and use a cable to connect the voltage-stabilized power supply to the electrical plug of the high-pressure solenoid valve.

2. The assembly and testing method of aerospace-specific high-pressure electromagnetic valve according to claim 1 is characterized in that: Before assembly, all parts' sealing, fitting and guiding locations are inspected for defects. All metal parts are soaked in aviation washing gasoline, degreased with a degreaser, and then manually cleaned. Finally, they are cleaned using an ultrasonic cleaner with built-in filtering function and anhydrous ethanol.

3. The assembly and testing method of aerospace-specific high-pressure electromagnetic valve according to claim 1 is characterized in that: Using a working voltage of 24V~30V, repeatedly energize and operate 50~100 times to pre-press the hard core of the unloading valve, so that a ball socket is formed at the hard core and the deformation of the hard core is eliminated in advance; then use a pre-pressing tool and a dial indicator to pre-press the sealing surface of the unloading valve to ensure that the stop depth is 0.06mm~0.08mm, forming a stop indentation.

4. The assembly and testing method of aerospace-specific high-pressure electromagnetic valve according to claim 1, characterized in that: The step 2 comprises: The electric variable test includes: before the test, the closed coil is pulse-powered with 21V for 100ms to ensure that the armature is on the closed coil side, the open coil and the closed coil are pulse-powered once alternately, the power supply is 28V, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable; then the power supply voltage is changed to 28V, 31V, 21V, and 36V respectively, the open coil and the closed coil are pulse-powered once alternately, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable; Magnetic variable measurement includes: before assembling the coil assembly, the measurement range is 0~2wb, the measurement accuracy is ±0.5%, and the high resolution is 0.1 Wb's TD8900 fluxmeter is used for measurement. The magnetized sample is placed in the uniform magnetic field of the measuring coil assembly. The sample is placed perpendicular to the Helmholtz coil. The zero point of the integrator is restored. Then the sample is pulled out of the coil assembly until the coupling effect with the measuring coil is negligible. The maximum reading of the flux integrator is the magnetic flux of the coil assembly. It also includes the measurement of action time, air tightness, and resistance performance; The action time test includes: when the pressure at the inlet of the high-pressure solenoid valve is 0Mpa, 1.5Mpa, and 36.5Mpa respectively, the high-pressure solenoid valve is energized to open and close the solenoid valve, and the electrical waveform display device is used to test the electrical waveform when the high-pressure solenoid valve is in action, and the opening and closing time of the high-pressure solenoid valve is observed, which is required to be less than 150 milliseconds; The air tightness test includes: the inlet of the high-pressure solenoid valve is filled with 1.5Mpa, the air leakage at the load-reducing valve does not exceed 30 bubbles / min, the air leakage at the valve assembly and the nozzle does not exceed 90 bubbles / min, and the nozzle gasket is airtight; 36.5MPa compressed air is passed into the inlet, and the air tightness requirements at the load-reducing valve, the valve assembly and the nozzle, and the nozzle gasket are all airtight; the valve assembly at least includes the main valve; The resistance performance test includes: using a multimeter to measure the resistance value of the internal coil of the high-voltage solenoid valve through the electrical plug contacts. When the temperature is 20℃~22℃, the resistance value is 17.2Ω±0.8Ω. Using an insulation resistance megohmmeter to measure the insulation resistance between the high-voltage solenoid valve coil and the shell, it is required to be greater than 100MΩ.

5. An assembly and testing system for aerospace-specific high-pressure electromagnetic valves, characterized in that: include: Assembly module: Assemble all parts of the high-pressure solenoid valve in a preset order, measure and adjust the stroke parameters, and build the high-pressure solenoid valve test pipeline and circuit; Test module: Test whether the electrical variables and magnetic variables of the high-voltage solenoid valve meet the preset requirements; The electric variable test includes: before the test, alternately pulse power supply once to the open coil and the closed coil, measure and record the electric waveform using the solenoid valve electric variable test equipment, and judge the electric variable; then change the different power supply voltages respectively and repeat the above steps; the open coil is the coil used to open the valve in the high-voltage solenoid valve, and the closed coil is the coil used to close the valve in the high-voltage solenoid valve; The magnetic variable measurement includes: before assembling the coil assembly, using a fluxmeter to measure, placing the magnetized sample in the uniform magnetic field area of ​​the measuring coil assembly, with the sample placement direction perpendicular to the Helmholtz coil, restoring the zero point of the integrator, and then pulling the sample out of the coil assembly until the coupling effect with the measuring coil is negligible, and the maximum reading of the flux integrator is the magnetic flux of the coil assembly; the Helmholtz coil is used to generate a uniform magnetic field in an area; The assembly module comprises: Put the spring, load-reducing valve and valve seat in the upper part of the valve body in turn, install the electromagnet on the valve body, connect and tighten the electromagnet and the valve body through a circle of four evenly distributed studs and nuts, cover and press the spring, load-reducing valve and valve seat, and then put the push rod and armature in the electromagnet. The armature is provided with a screw. Adjust the height of the screw to roughly adjust the C stroke of the solenoid valve, and cover it with the screw cover provided by the electromagnet. The C stroke here refers to the maximum distance that the electromagnet pushes the armature to move when the solenoid valve is powered on and opened. The C stroke of the solenoid valve meets 0.3mm~0.6mm; When the electromagnetic head iron moves, the push rod is pushed against the hard core of the load-reducing valve to pre-press the hard core of the load-reducing valve, so that the hard core of the load-reducing valve forms a depression. Then, the pre-pressing tool is used to pre-press the sealing surface of the load-reducing valve and measure the depth, so that the sealing surface of the load-reducing valve forms a stop indentation of a preset size; Place a large spring and main valve at the bottom of the valve body, and use a special lifting assembly tool to screw in the pipe nozzle so that the sealing surface of the main valve does not touch the pipe nozzle during the assembly process. The pipe nozzle is screwed into the valve body through a threaded connection to assemble a high-pressure solenoid valve. Use a depth gauge to measure and adjust the C stroke by adjusting the screw to meet 0.3mm~0.4mm; Access the high-pressure gas source through a metal pipeline, fill the compressed gas into the inlet of the high-pressure solenoid valve through a manual shut-off valve and a pressure gauge, and use a cable to connect the voltage-stabilized power supply to the electrical plug of the high-pressure solenoid valve.

6. The assembly and testing system for aerospace-specific high-pressure electromagnetic valves according to claim 5, characterized in that: Before assembly, all parts' sealing, fitting and guiding locations are inspected for defects. All metal parts are soaked in aviation washing gasoline, degreased with a degreaser, and then manually cleaned. Finally, they are cleaned using an ultrasonic cleaner with built-in filtering function and anhydrous ethanol.

7. The assembly and testing system for aerospace-specific high-pressure electromagnetic valves according to claim 5, characterized in that: Using a working voltage of 24V~30V, repeatedly energize and operate 50~100 times to pre-press the hard core of the unloading valve, so that a ball socket is formed at the hard core and the deformation of the hard core is eliminated in advance; then use a pre-pressing tool and a dial indicator to pre-press the sealing surface of the unloading valve to ensure that the stop depth is 0.06mm~0.08mm, forming a stop indentation.

8. The assembly and testing system for aerospace-specific high-pressure electromagnetic valves according to claim 5, characterized in that: The test module includes: The electric variable test includes: before the test, the closed coil is pulse-powered with 21V for 100ms to ensure that the armature is on the closed coil side, the open coil and the closed coil are pulse-powered once alternately, the power supply is 28V, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable; then the power supply voltage is changed to 28V, 31V, 21V, and 36V respectively, the open coil and the closed coil are pulse-powered once alternately, the pulse power supply time is 100ms, and the solenoid valve electric variable test equipment is used to measure and record the electric waveform and interpret the electric variable; Magnetic variable measurement includes: before assembling the coil assembly, the measurement range is 0~2wb, the measurement accuracy is ±0.5%, and the high resolution is 0.1 Wb's TD8900 fluxmeter is used for measurement. The magnetized sample is placed in the uniform magnetic field of the measuring coil assembly. The sample is placed perpendicular to the Helmholtz coil. The zero point of the integrator is restored. Then the sample is pulled out of the coil assembly until the coupling effect with the measuring coil is negligible. The maximum reading of the flux integrator is the magnetic flux of the coil assembly. It also includes the measurement of action time, air tightness, and resistance performance; The action time test includes: when the pressure at the inlet of the high-pressure solenoid valve is 0Mpa, 1.5Mpa, and 36.5Mpa respectively, the high-pressure solenoid valve is energized to open and close the solenoid valve, and the electrical waveform display device is used to test the electrical waveform when the high-pressure solenoid valve is in action, and the opening and closing time of the high-pressure solenoid valve is observed, which is required to be less than 150 milliseconds; The air tightness test includes: the inlet of the high-pressure solenoid valve is filled with 1.5Mpa, the air leakage at the load-reducing valve does not exceed 30 bubbles / min, the air leakage at the valve assembly and the nozzle does not exceed 90 bubbles / min, and the nozzle gasket is airtight; 36.5MPa compressed air is passed into the inlet, and the air tightness requirements at the load-reducing valve, the valve assembly and the nozzle, and the nozzle gasket are all airtight; the valve assembly at least includes the main valve; The resistance performance test includes: using a multimeter to measure the resistance value of the internal coil of the high-voltage solenoid valve through the electrical plug contacts. When the temperature is 20℃~22℃, the resistance value is 17.2Ω±0.8Ω. Using an insulation resistance megohmmeter to measure the insulation resistance between the high-voltage solenoid valve coil and the shell, it is required to be greater than 100MΩ.

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