Electric valve cold flow calibration test device and method

Abstract

According to the electric valve cold flow calibration test device, the air inlet mode of a test bed is designed into a mode of combining lateral air inlet with a variable perforated plate, so that incoming flow can be effectively stabilized, and the porosity of the variable perforated plate can be flexibly and actively adjusted according to the flow; the electric valve is connected with the servo driving assembly and the air inlet flow channel in a detachable mode, all the modules can be flexibly replaced according to different working modes, and the device can be suitable for cold flow calibration tests of valves of various configurations and can be matched with servo driving devices of various driving modes. The working mode that the servo motor drives the speed reducer to drive the valve element to actuate is adopted, the output torque of the servo motor drives the valve element to actuate after being decelerated by the speed reducer, the maximum torque can be matched with the motor power according to the actual application scene, and the actuation accuracy and calibration precision of the electric valve in the cold flow calibration test are improved.

Description

Technical Field

[0001] The invention relates to a cold flow calibration test device and method for an electric valve, belonging to the technical field of solid ramjet engine testing. Background Art

[0002] In the flow regulation of solid ramjet engines, in order to achieve precise control, it is crucial to carry out cold flow calibration tests on the throat area of ​​electric valves used in solid ramjet engines. At present, cold flow calibration test devices are generally designed for test needs and are not universal. Considering the configuration characteristics of the oxygen-depleted fuel gas energy supply system of solid ramjet engines, there are few dynamic actuation cold flow calibration test devices for different electric valve adjustment actuation modes, and it is impossible to achieve electric actuation during the valve cold flow calibration process, and it is impossible to obtain the flow coefficient of the throat area when the electric valve is working.

[0003] Chinese patent CN117969105A discloses a rotary orbit controlled jet cold flow test device, which realizes nozzle thrust vector control by controlling the switch jet mechanism through a solenoid valve and a nozzle. Its advantages are that it can realize "switch type" nozzle area control and complete the rapid opening and closing of the nozzle, but its disadvantage is that it cannot realize continuous actuation adjustment of the nozzle throat area during the cold flow test, and cannot complete the dynamic actuation cold flow calibration test of the adjustment section.

[0004] Chinese patent CN115013188A discloses a modular sub-assembly solid rocket engine test bench device and a cold flow test method. The advantage is that each module can be freely disassembled and replaced by bolt connections, but the disadvantage is that the flow regulating section is only a two-dimensional simplified configuration, and the specific configuration of the flow regulating section cannot be simulated. In addition, the throat area is fixed, and only one throat area can be used to complete the cold flow test at a time, and the dynamic actuation cold flow calibration test of the regulating section cannot be completed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, improve the accuracy of cold flow calibration of electric valves, and improve the availability and application scope of cold flow test devices for electric valves.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A cold flow calibration test device and method for electric valves are suitable for the configuration of the oxygen-depleted fuel gas energy supply system of a solid ramjet engine, and can realize cold flow calibration tests suitable for the dynamic actuation of electric valves of various configurations. A cold flow calibration method for the throat area of ​​an electric valve is proposed, which is based on the size of the pneumatic throat of the electric valve. By comparing the theoretical design value of the throat area and the cold flow calibration test value, the flow coefficient of the throat area of ​​the electric valve is obtained.

[0008] An electric valve cold flow calibration test device, comprising a base, a slide rail, a valve, a tapered section, a slider, a support frame, a top plate, a thrust sensor, a connecting frame, a support rib, a pressure measuring hole, an observation window, a variable porous plate, an air intake pipe, a servo motor, and a reducer;

[0009] Two slide rails are fixed on the base. The slide rails are used to control the displacement of the test piece only in the axial direction. The slider is provided with a damper and is mounted on the slide rail. The slider is used to fix the support frame. The support frame supports the intake air passage and limits its displacement in the radial direction. The top plate is fixed on the support rib plate and is used to support the thrust sensor and limit the displacement of the test piece in the axial direction when the test piece is working. The support rib plate is fixed on the base.

[0010] The valve is connected to the tapered section through an adapter joint, the tapered section is fixed to the front end of the intake flow passage, the thrust sensor is fixed to the top plate, the connecting frame is fixed between the rear end of the intake flow passage and the top plate, the pressure measuring hole is placed at the front end of the intake flow passage, the pressure sensor is installed there, and is used to measure the internal flow field pressure when the test piece is working, the observation window is placed in the middle of the intake flow passage through an interference fit, the variable porous plate is placed in the middle and rear of the intake flow passage through an interference fit, and the intake pipe is installed at the rear end of the intake flow passage to input gas from the gas supply system into the intake flow passage;

[0011] The output end of the servo motor is connected to the input end of the reducer, and the output end of the reducer is connected to the valve core through a coupling. The output torque of the servo motor acts on the valve core after being decelerated by the reducer to drive the valve to work.

[0012] A calibration test method based on the above-mentioned electric valve cold flow calibration test device comprises:

[0013] Build a Schlieren optical path system to obtain the gas flow law in the internal flow field at the observation window, turn on the servo motor and reducer, input control instructions to adjust the valve core to the specified working position, turn on the pressure sensor and thrust sensor, turn on the gas supply system flow collector, open the gas supply system valve, and close the gas supply system valve after the gas enters a stable flow state;

[0014] After the test, the internal flow field pressure P collected when the test system was working was obtained. c , Gas supply system flow The following calculation can be used to obtain the pneumatic throat area A of the electric valve under the cold flow test: t ,

[0015]

[0016] Among them C * is a fixed gas parameter, which is determined by the gas used in the cold flow calibration test; the pneumatic throat area A of the electric valve tThe cold flow experimental values ​​were compared with the theoretical design values ​​to obtain the flow coefficient of the throat area of ​​the electric valve.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention designs the air intake mode of the test bench as a lateral air intake combined with a variable porous plate. The variable porous plate can effectively stabilize the incoming flow and flexibly and actively adjust the porosity of the variable porous plate according to the flow rate, thereby improving the accuracy of the cold flow calibration of the electric valve.

[0019] (2) The present invention adopts a detachable method as the connection between the electric valve and the servo drive assembly and the intake air duct. Each module can be flexibly replaced according to different working modes. The cold flow test device can be applicable to cold flow calibration tests of valves of various configurations, and can match servo drive devices of various driving modes. The entire cold flow test device can be disassembled and assembled according to task requirements to match multifunctional personalized requirements, thereby increasing the availability and scope of application of the electric valve cold flow test device.

[0020] (3) The present invention adopts a working mode in which a servo motor drives a reducer to actuate the valve core. The output torque of the servo motor is decelerated by the reducer to drive the valve core to actuate. The maximum torque can be matched by the motor power according to the actual application scenario, thereby improving the actuation accuracy and calibration precision of the electric valve in the cold flow calibration test.

[0021] (4) The present invention provides an observation window in the middle of the inlet flow passage, and the flow state of the flow field in the entire cold flow test can be observed by using the Schlieren method, which provides support for understanding the flow law of the fuel gas in the oxygen-depleted fuel gas energy supply system of the solid ramjet engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural composition diagram in an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the cross section of the intake air duct in an embodiment of the present invention.

[0024] Figure 3 Schematic diagram of the servo drive composition in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] A cold flow calibration test device for electric valves, such as Figure 1 , 2As shown in FIG. 3 , it includes a base 1, a slide rail 2, a valve 3, a tapered section 4, a slider 5, a support frame 6, a top plate 7, a thrust sensor 8, a connecting frame 9, a support rib 10, a pressure measuring hole 11, an observation window 12, a variable porous plate 13, an air intake pipe 14, a servo motor 15, and a reducer 16.

[0027] The test bench assembly consists of a base 1, a slide rail 2, a slider 5, a support frame 6, a top plate 7, and a support rib 10. The upper surface of the base 1 is provided with threaded holes for connection and fixation with the remaining components. The two slide rails 2 are fixed to the base 1 by threaded connection. The slide rails 2 are used to control the test piece to produce only a small displacement in the axial direction. The slider 5 is provided with damping and is mounted on the slide rail 2. The slider 5 is used to fix the support frame 6. The built-in damping of the slider 5 ensures that the displacement range of the test piece during the test is within a controllable range. The support frame 6 is fixed to the slider 5 by threaded connection. The support frame 6 supports the intake air passage and limits its displacement in the radial direction. The top plate 7 is fixed to the support rib 10 by threaded connection, which is used to support the thrust sensor 8 and limit the axial displacement of the test piece when it is working. The support rib 10 is fixed to the base 1 by threaded connection, which mainly provides a limit for the axial direction of the entire test system.

[0028] The test piece assembly consists of a valve 3, a tapered section 4, a thrust sensor 8, a connecting frame 9, a pressure measuring hole 11, an observation window 12, a variable porous plate 13, and an air intake pipe 14. The valve 3 is connected to the tapered section 4 through an adapter joint, and the tapered section 4 is fixed to the front head of the intake channel through a bolt connection. The thrust sensor 8 is fixed to the top plate 7 through a threaded connection. The connecting frame 9 is fixed between the rear head of the intake channel and the top plate 7 through an interference fit, so that the thrust generated when the test piece is working is evenly transmitted to the thrust sensor 8. The pressure measuring hole 11 is placed at the front end of the intake channel, and the pressure sensor is installed here to measure the internal flow field pressure when the test piece is working. The observation window 12 is placed in the middle of the intake channel through an interference fit, and the changes in the internal flow field when the test piece is working are observed by the schlieren method. The variable porous plate 13 is placed in the middle and rear part of the intake channel through an interference fit, and is used to adjust the jet generated by the intake pipe 14 and stabilize the flow of gas in the internal flow field. The intake pipe 14 is installed at the rear end of the intake channel through a threaded connection to input the gas from the air supply system into the intake channel.

[0029] The servo drive assembly is mainly composed of a servo motor 15 and a reducer 16. The output end of the servo motor 15 is connected to the input end of the reducer 16, and the strength of the connection is strengthened by bolts. The output end of the reducer 16 is connected to the valve core of the valve 3 through a coupling. The output torque of the servo motor is decelerated by the reducer and acts on the valve core of the valve 3 to drive the valve 3 to work.

[0030] A cold flow calibration test method for an electric valve includes: assembling the test bench assembly, the test piece assembly, and the servo drive assembly, building a Schlieren optical path system to obtain the gas flow law in the internal flow field at the observation window 12, turning on the servo motor 15 and the reducer 16, inputting a control command to adjust the valve core of the valve 3 to a specified working position, turning on the pressure sensor and the thrust sensor 8, turning on the air supply system flow collector, opening the air supply system valve, and closing the air supply system valve after the gas enters a stable flow state. After the test, the internal flow field pressure P collected when the test system is working can be obtained. c , Gas supply system flow Formula 1 can be used to calculate the pneumatic throat area A of the electric valve under the cold flow test t , where C * It is a fixed gas parameter, which is determined by the gas used in the cold flow calibration test. t The cold flow experimental values ​​were compared with the theoretical design values ​​to obtain the flow coefficient of the throat area of ​​the electric valve.

[0031]

[0032] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

[0033] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A cold flow calibration test device for electric valves, characterized in that: It comprises a base (1), a slide rail (2), a valve (3), a tapered section (4), a slider (5), a support frame (6), a top plate (7), a thrust sensor (8), a connecting frame (9), a support rib (10), a pressure measuring hole (11), an observation window (12), a variable porous plate (13), an air intake pipe (14), a servo motor (15), and a reducer (16); Two slide rails (2) are fixed on the base (1), the slide rails (2) are used to control the displacement of the test piece only in the axial direction, the slider (5) is provided with damping inside and is mounted on the slide rail (2), the slider (5) is used to fix the support frame (6), the support frame (6) supports the intake air passage and limits its displacement in the radial direction, the top plate (7) is fixed on the support rib plate (10), is used to support the thrust sensor (8) and limit the displacement of the test piece in the axial direction when working, and the support rib plate (10) is fixed on the base (1); The valve (3) is connected to the tapered section (4) through an adapter joint, the tapered section (4) is fixed to the front end of the intake channel, the thrust sensor (8) is fixed to the top plate (7), the connecting frame (9) is fixed between the rear end of the intake channel and the top plate (7), the pressure measuring hole (11) is placed at the front end of the intake channel, the pressure sensor is installed there, and is used to measure the internal flow field pressure of the test piece when working, the observation window (12) is placed in the middle of the intake channel through an interference fit, the variable porous plate (13) is placed in the middle and rear of the intake channel through an interference fit, and the intake pipe (14) is installed at the rear end of the intake channel to input gas from the gas supply system into the intake channel; The output end of the servo motor (15) is connected to the input end of the reducer (16), and the output end of the reducer (16) is connected to the valve core of the valve (3) through a coupling. The output torque of the servo motor (15) is decelerated by the reducer (16) and then acts on the valve core of the valve (3), thereby driving the valve (3) to work.

2. The electric valve cold flow calibration test device according to claim 1, characterized in that: The slider (5) has built-in damping to ensure that the displacement range of the test piece is within a controllable range during the test, and the support frame (6) is fixed to the slider (5) through a threaded connection.

3. The electric valve cold flow calibration test device according to claim 1, characterized in that: The changes of the internal flow field of the test piece during operation were observed by the Schlieren method.

4. The electric valve cold flow calibration test device according to claim 1, characterized in that: The connecting frame (9) is fixed between the rear end cover of the intake air passage and the top plate (7) by interference fit, and the thrust generated when the test piece is working is evenly transmitted to the thrust sensor (8).

5. The electric valve cold flow calibration test device according to claim 1, characterized in that: The variable porous plate (13) is used to adjust the jet generated by the air inlet pipe (14) and stabilize the flow of gas in the internal flow field.

6. The electric valve cold flow calibration test device according to claim 1, characterized in that: The strength of the connection between the output end of the servo motor (15) and the input end of the reducer (16) is strengthened by bolts.

7. The electric valve cold flow calibration test device according to claim 1, characterized in that: The supporting ribs (10) provide a limit for the entire test system in the axial direction.

8. A calibration test method based on the electric valve cold flow calibration test device according to claim 1, characterized in that: include: A Schlieren optical path system is constructed to obtain the gas flow pattern in the internal flow field at the observation window (12), the servo motor (15) and the reducer (16) are turned on, a control command is input to adjust the valve core of the valve (3) to a specified working position, the pressure sensor and the thrust sensor (8) are turned on, the gas supply system flow collector is turned on, the gas supply system valve is opened, and the gas supply system valve is closed after the gas enters a stable flow state; After the test, the internal flow field pressure P collected when the test system was working was obtained. c , Gas supply system flow The following calculation can be used to obtain the pneumatic throat area A of the electric valve under the cold flow test: t , Among them C * is a fixed gas parameter, which is determined by the gas used in the cold flow calibration test; the pneumatic throat area A of the electric valve t The cold flow experimental value is compared with the theoretical design value to obtain the flow coefficient of the throat area of ​​the electric valve.

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