Pneumatic test methods for hydraulic adjustment mechanism, drive control system and rear culvert ejector

Abstract

The present application provides a hydraulic adjustment mechanism for driving a rear culvert ejector actuator, which comprises a hydraulic oil tank, an oil supply pipeline and an oil return pipeline. The oil supply pipeline connects the hydraulic oil tank and the oil inlet of the rear culvert ejector actuator. On the oil supply pipeline, a booster pump group, a filter, a first non-return valve, a first solenoid valve and an electro-hydraulic servo valve are provided in sequence from the hydraulic oil tank to the actuator. The oil return pipeline connects the hydraulic oil tank and the oil outlet of the rear culvert ejector actuator. On the oil return pipeline, an electro-hydraulic servo valve, a second non-return valve and a cooler are provided in sequence from the actuator to the hydraulic oil tank. A second solenoid valve and an overflow valve are provided in parallel between the return oil pipeline and the oil supply pipeline. By adjusting the working pressure of the overflow valve, the hydraulic adjustment mechanism can be prevented from being damaged by overpressure after damage. The hydraulic oil in the hydraulic oil tank can be pressurized by the booster pump group and can be transported to the oil inlet of the rear culvert ejector actuator through the oil supply pipeline, and returned to the hydraulic oil tank through the oil return pipeline.

Description

Technical Field

[0001] The present application belongs to the technical field of aero-engines, and in particular relates to a hydraulic adjustment mechanism, a drive control system and a pneumatic test method for a rear duct ejector. Background Art

[0002] The variable cycle engine can change the bypass ratio within a large range, so that the engine can meet the needs of different flight missions. It is considered to be one of the ideal power units for current aircraft.

[0003] The variable cycle engine realizes variable engine cycle through variable geometric components. Therefore, studying the working characteristics of each variable component of the variable cycle engine is very important for the development of the engine. Among them, the rear duct ejector 13 (RVABI) is one of the unique and important structures of the double outer duct (inner duct 11, outer duct 12) variable cycle engine. It is similar to an area-adjustable mixer. The rear duct ejector actuator 14 is driven by a hydraulic mechanism to adjust the area, thereby changing the bypass ratio of the engine. The typical structure of the engine rear duct ejector is shown in FIG. Figure 1 .

[0004] At present, the aerodynamic area adjustment test of the afterburner rear duct ejector mostly adopts a mechanical hydraulic adjustment mechanism, and the aerodynamic area is adjusted by manual hydraulic loading. The adjustment is time-consuming and has low adjustment accuracy. At the same time, the manual method can only load one actuator cylinder, which often causes the displacement of multiple actuator cylinders in the circumferential direction to be asynchronous and the ejector actuation to be stuck, bringing a series of subsequent problems. At the same time, there is no clear test method for the aerodynamic test of the afterburner rear duct ejector, which affects the development of the test work. Summary of the invention

[0005] The purpose of the present application is to provide a hydraulic adjustment mechanism, a drive control system and a pneumatic test method for a rear duct ejector to solve or alleviate at least one problem in the background technology.

[0006] On the one hand, the present application provides a hydraulic adjustment mechanism for driving an actuator of a rear duct ejector in a pneumatic test of a rear duct ejector of an afterburner, the hydraulic adjustment mechanism comprising a hydraulic oil tank, an oil supply pipeline and an oil return pipeline, wherein:

[0007] The oil supply pipeline connects the hydraulic oil tank and the oil inlet of the rear culvert ejector actuator. A booster pump group, a filter, a first one-way valve, a first solenoid valve and an electro-hydraulic servo valve are arranged in sequence on the oil supply pipeline from the hydraulic oil tank to the actuator.

[0008] The oil return pipeline connects the hydraulic oil tank and the oil outlet of the rear culvert ejector actuator, and the oil return pipeline is provided with an electro-hydraulic servo valve, a second one-way valve and a cooler in sequence from the actuator to the hydraulic oil tank;

[0009] A second solenoid valve and a relief valve are provided in parallel between the oil return pipeline and the oil supply pipeline, and the hydraulic regulating mechanism can be prevented from damaging the rear culvert ejector actuator cylinder due to overpressure by adjusting the working pressure of the relief valve;

[0010] The hydraulic oil in the hydraulic oil tank can be pressurized by the booster pump group and then transported to the oil inlet of the rear duct ejector actuator through the oil supply pipeline, and returned to the hydraulic oil tank through the oil return pipeline.

[0011] Furthermore, a manual valve and an accumulator are connected between the one-way valve of the oil supply pipeline and the first solenoid valve.

[0012] Furthermore, the cooler is connected to a circulating water pipeline, and the hydraulic oil in the oil return pipeline 23 can be cooled by the cooler, and the cooling medium is provided to the cooler through the circulating water pipeline.

[0013] Furthermore, the cooling medium is water.

[0014] Furthermore, pressure sensors are provided on the oil supply pipeline and oil return pipeline of the oil inlet and oil outlet of the rear culvert ejector actuator to monitor the oil inlet and oil outlet pressure of the actuator.

[0015] Furthermore, a temperature sensor is provided on one side of the second one-way valve in the oil return line close to the actuator cylinder of the rear culvert ejector, for monitoring the temperature of the oil returning to the hydraulic oil tank.

[0016] On the other hand, the present application provides a hydraulic adjustment mechanism drive control system for realizing drive control of any of the above hydraulic adjustment mechanisms, the drive control system comprising: a digital controller, a display module, a remote computer and a PLC control unit,

[0017] The hydraulic adjustment mechanism and the PLC control unit are integrated on a unified operating platform;

[0018] After the digital controller sends an excitation voltage signal to the rear duct ejector actuator, the linear displacement sensor built into the rear duct ejector actuator works and outputs voltage signals to the digital controller and the PLC control unit respectively;

[0019] The PLC control unit processes the signal and feeds it back to the remote computer;

[0020] The remote computer collects the operating parameters in real time and displays them through the display module;

[0021] During the test, a remote computer is used to send an actuator action instruction to the PLC control unit, and the PLC control unit sends an execution instruction to the booster pump group, solenoid valve and electro-hydraulic servo valve on the hydraulic adjustment mechanism to execute the action.

[0022] Finally, the present application also provides a pneumatic test method for a rear duct ejector, which uses the above hydraulic adjustment mechanism drive control system to drive and control any of the above hydraulic adjustment mechanisms, and the test method includes:

[0023] Non-pneumatic state debugging: Assemble the afterburner with the rear duct ejector onto the test bench and keep it in a horizontal position. Disconnect the actuator of the rear duct ejector from the driving load. Connect the oil supply and return pipes in the hydraulic adjustment mechanism to the oil inlet and return nozzles of each actuator of the rear duct ejector respectively. Start the pump of the hydraulic adjustment mechanism. Drive the actuator in forward and reverse strokes respectively. According to the output displacement value of the actuator linear displacement sensor, set equidistant steps to keep the actuator at this position. Record the working parameters of the hydraulic adjustment mechanism and complete the initial setting of the synchronous servo valve control logic. Reconnect the actuator of the rear duct ejector to the load, start the pump of the hydraulic adjustment mechanism, repeat the above process, and complete the first correction of the synchronous control logic of the electromagnetic servo valve.

[0024] Pneumatic state debugging: provide internal and external duct airflow that meets the test state requirements to the afterburner inlet, carry out pneumatic state debugging of the rear duct ejector actuator, start the hydraulic adjustment mechanism pump, and complete two corrections to the electromagnetic servo valve control logic according to the non-pneumatic state debugging method. After this correction, the synchronous adjustment accuracy required by the test can be guaranteed.

[0025] After the hydraulic adjustment mechanism is debugged, the aerodynamic test of the afterburner rear duct ejector is carried out according to the test process. The displacement of the rear duct ejector actuator and the aerodynamic state of the inner and outer ducts are adjusted in turn, and all test parameters are recorded.

[0026] Furthermore, the displacement adjustment of the actuator cylinder is divided into a synchronous mode and an asynchronous mode;

[0027] In the synchronous mode, the maximum working pressure of the hydraulic mechanism and the maximum displacement asynchronism of the actuator are set in advance using the display interface of the hydraulic drive control system, the booster pump group is started, the synchronous working mode of the actuator of the rear culvert ejector is selected, the displacement target value and movement speed are set, the servo valve is started, and the displacement adjustment of the actuator of the culvert ejector is completed;

[0028] In the asynchronous mode, when the displacement asynchronism of the rear duct ejector exceeds the limit due to specific reasons, the synchronous mode is turned off and the asynchronous mode is started. According to the deviation between the actual displacement value and the target displacement value of different rear duct ejector actuators, the rear duct ejector actuators with large displacement value deviation are hydraulically driven separately, and the displacement is gradually approached to make the displacement value of the rear duct ejector actuator close to that of the rear duct ejector actuator with small deviation. The action is repeated until the displacement asynchronism between the rear duct ejector actuators meets the requirements, and then the operation is switched to the synchronous mode again.

[0029] The hydraulic adjustment mechanism provided in the present application can automatically and synchronously adjust the aerodynamic area of ​​the rear duct ejector, which can reduce the adjustment time and improve the displacement adjustment accuracy. At the same time, a clear test method is formed for the aerodynamic test of the afterburner rear duct ejector, which facilitates the smooth implementation of the test and can also be used to guide the aerodynamic test of the afterburner with the rear duct ejector. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0031] Figure 1 This is a schematic diagram of the typical structure of the engine rear duct ejector.

[0032] Figure 2 This is a schematic diagram of the hydraulic adjustment mechanism of this application;

[0033] Figure 3 It is a schematic diagram of the control mode of the hydraulic adjustment mechanism;

[0034] Figure 4 The following is a schematic diagram of the aerodynamic test process of the rear duct ejector;

[0035] Figure 5 This is a schematic diagram of the remote control interface of the hydraulic mechanism. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0037] In order to overcome the shortcomings existing in the prior art, the present application provides a hydraulic adjustment mechanism that can automatically and synchronously adjust the aerodynamic area of ​​the rear duct ejector, so as to reduce the adjustment time and improve the displacement adjustment accuracy. At the same time, a clear test method is formed for the aerodynamic test of the afterburner rear duct ejector, which can be used to guide the aerodynamic test of the afterburner with the rear duct ejector.

[0038] The hydraulic adjustment mechanism for the pneumatic test of the afterburner rear duct ejector provided in the present application uses a hydraulic drive method to control the stroke of the rear duct ejector actuator, thereby achieving precise adjustment of the pneumatic state of the dual duct mode.

[0039] like Figure 2 As shown, the hydraulic adjustment mechanism includes: a hydraulic oil tank 21, an oil supply pipeline 22 and an oil return pipeline 23, which are used to drive multiple rear culvert ejector actuators 14.

[0040] The oil supply line 22 connects the hydraulic oil tank 21 and the oil inlet of the rear duct ejector actuator (or simply the actuator 14). The oil supply line 22 is provided with a booster pump group 221, a filter 222, a first check valve 223, a first solenoid valve 227 and an electro-hydraulic servo valve 226 in sequence from the hydraulic oil tank 21 to the actuator 14. A manual valve 224 and an accumulator 225 are connected between the first check valve 223 and the first solenoid valve 227. After the booster pump group 221 works, the hydraulic oil in the hydraulic oil tank 21 is pressurized and then transported to the oil inlet of the rear duct ejector actuator 14 through the oil supply line 22, and finally returned to the hydraulic oil tank 21 through the return oil line 23.

[0041] The return oil pipeline 23 connects the hydraulic oil tank 21 and the oil outlet of the rear culvert ejector actuator (referred to as the actuator 14). The return oil pipeline 23 is provided with an electro-hydraulic servo valve 226, a second one-way valve 233 and a cooler 231 in sequence from the actuator 14 to the hydraulic oil tank 21. The cooler 231 is connected to a circulating water pipeline 232. The hydraulic oil in the return oil pipeline 23 can be cooled by the cooler 231, and cooling water is provided to the cooler 231 through the circulating water pipeline 232.

[0042] A second solenoid valve 236 and a relief valve 237 are provided in parallel on the inner side of the one-way valves of the return oil pipeline 22 and the supply oil pipeline 23 (on the side close to the hydraulic oil tank 21). The working pressure can be flexibly set through the relief valve 237 to prevent damage to the actuator 14 after the system is over-pressurized.

[0043] Preferably, a pressure sensor 235 is provided on the oil supply pipeline 22 and the oil return pipeline 23 of the oil inlet and oil outlet of the actuator 14, for monitoring the oil inlet and oil outlet pressure of the actuator 14. Furthermore, a temperature sensor 234 is provided on the outer side of the second one-way valve 233 in the oil return pipeline 23 (on the side close to the actuator 14), for monitoring the temperature of the oil returning to the hydraulic oil tank 21.

[0044] In order to be able to control the above hydraulic adjustment mechanism, the present application also provides a hydraulic drive control system of the hydraulic adjustment mechanism, such as Figure 3As shown, the hydraulic drive control system includes a digital controller, a display module, a remote computer and a PLC control unit. The hydraulic adjustment mechanism and the PLC control unit are integrated on a unified operating platform, and the platform works after powering on. The digital controller sends an excitation voltage signal to the rear duct ejector actuator 14, and the built-in linear displacement sensor of the rear duct ejector actuator 14 works, and outputs voltage signals to the digital controller and the PLC control unit respectively. The PLC control unit processes the signal and feeds it back to the remote computer, and the remote computer collects and displays the operating parameters in real time. During the test, the remote computer is used to send the actuator action command to the PLC control unit, and the PLC control unit sends specific instructions to the pump motor, solenoid valve, electro-hydraulic servo valve and other components on the hydraulic adjustment mechanism to execute the action.

[0045] In addition, the present application also provides a test method based on the above hydraulic adjustment mechanism, the process is as follows:

[0046] Non-pneumatic state debugging: Assemble the afterburner with the rear duct ejector 13 onto the test bench, keep it in a horizontal position, disconnect the rear duct ejector actuator 14 from the driving load, connect the oil supply and return pipes in the hydraulic adjustment mechanism to the oil inlet and return nozzles of each actuator 14 of the rear duct ejector respectively, start the hydraulic adjustment mechanism to pump, drive the actuator 14 in forward and reverse strokes respectively, set equidistant steps according to the output displacement value of the actuator linear displacement sensor to keep the actuator at this position, record the working parameters of the hydraulic adjustment mechanism, and complete the initial setting of the synchronous servo valve control logic; reconnect the actuator 14 of the rear duct ejector to the load, start the hydraulic adjustment mechanism to pump, repeat the above process, and complete the first correction of the synchronous control logic of the electromagnetic servo valve 226;

[0047] Pneumatic state debugging: provide internal and external duct airflow that meets the test state requirements to the afterburner inlet, carry out pneumatic state debugging of the rear duct ejector actuator, start the hydraulic adjustment mechanism pump, and complete two corrections to the control logic of the electromagnetic servo valve 226 according to the non-pneumatic state debugging method. After this correction, the synchronous adjustment accuracy required by the test can be guaranteed.

[0048] After the hydraulic adjustment mechanism is debugged, Figure 4 The test process shown in the figure carries out the aerodynamic test of the afterburner rear duct ejector, adjusts the displacement of the actuator and the aerodynamic state of the inner and outer ducts in turn, and completes the various test parameters. The displacement adjustment of the actuator is divided into two working modes: synchronous and asynchronous.

[0049] Synchronous mode: Figure 5As shown, using the display interface of the hydraulic drive control system, the maximum working pressure of the hydraulic mechanism and the maximum displacement asynchronism of the actuator are set in advance, the pump is started, the actuator synchronous working mode is selected, the displacement target value and movement speed are set, the servo valve is started, and the actuator displacement adjustment is completed;

[0050] Asynchronous mode: When the displacement asynchronism of the rear duct ejector exceeds the limit due to specific reasons, the motion mechanism is prone to jamming. At this time, it is necessary to turn off the synchronous mode and start the asynchronous mode. According to the deviation between the actual displacement value and the target displacement value of different actuators 14, a separate hydraulic drive is adopted for the actuator with a large displacement value deviation, and the displacement is gradually approached to make its displacement value close to the actuator with a small deviation. The action is repeated until the displacement asynchronism between the actuators meets the requirements, and then switch to the synchronous mode again.

[0051] For example, in one embodiment of the present application, the actuator has a larger displacement deviation of 0.8mm due to sticking, and the displacement deviation of the other actuator is 0.3mm. At this time, the actuator with the larger displacement deviation is first controlled to approach 0.3mm, and then the displacement deviations of the two actuators are compared again, and the actuator with the larger displacement deviation is controlled to approach the smaller one, until the displacement deviations of the two actuators are within a controllable range (for example, 0.1mm).

[0052] The hydraulic adjustment mechanism adopts synchronous mode and asynchronous mode, and can set working pressure, displacement and actuation speed, etc. It can be adjusted conveniently and flexibly according to the actual working state of the actuator cylinder of the rear duct ejector, shortening the adjustment time and improving the adjustment accuracy, while reducing the risk of damage to the rear duct ejector due to asynchronous displacement of the actuator cylinder.

[0053] The hydraulic adjustment mechanism provided in the present application can automatically and synchronously adjust the aerodynamic area of ​​the rear duct ejector, which can reduce the adjustment time and improve the displacement adjustment accuracy. At the same time, a clear test method is formed for the aerodynamic test of the afterburner rear duct ejector, which facilitates the smooth implementation of the test and can also be used to guide the aerodynamic test of the afterburner with the rear duct ejector.

[0054] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A hydraulic adjustment mechanism for driving an actuator (14) of a rear duct ejector in a pneumatic test of a rear duct ejector of an afterburner, characterized in that: The hydraulic adjustment mechanism comprises a hydraulic oil tank (21), an oil supply pipeline (22) and an oil return pipeline (23), wherein: The oil supply pipeline (22) is connected to the hydraulic oil tank (21) and the oil inlet of the rear culvert ejector actuator (14); a booster pump group (221), a filter (222), a first check valve (223), a first solenoid valve (227) and an electro-hydraulic servo valve (226) are provided on the oil supply pipeline (22) in sequence from the hydraulic oil tank (21) to the actuator (14); The oil return pipeline (23) is connected to the hydraulic oil tank (21) and the oil outlet of the rear duct ejector actuator (14), and the oil return pipeline (23) is provided with an electro-hydraulic servo valve (226), a second non-return valve (233) and a cooler (231) in sequence from the actuator (14) to the hydraulic oil tank (21); A second electromagnetic valve (236) and a relief valve (237) are provided in parallel between the oil return pipeline (22) and the oil supply pipeline (23), and by adjusting the working pressure of the relief valve (237), it is possible to prevent the hydraulic adjustment mechanism from damaging the rear culvert ejector actuator (14) due to overpressure; The hydraulic oil in the hydraulic oil tank (21) is pressurized by a booster pump group (221) and can be transported to the oil inlet of the rear duct ejector actuator (14) through an oil supply pipeline (22), and returned to the hydraulic oil tank (21) through an oil return pipeline (23).

2. The hydraulic adjustment mechanism according to claim 1, characterized in that: A manual valve (224) and an accumulator (225) are connected between the one-way valve (223) and the first solenoid valve (227) of the oil supply pipeline (22).

3. The hydraulic adjustment mechanism according to claim 1, characterized in that: The cooler (231) is connected to a circulating water pipeline (232), and the hydraulic oil in the oil return pipeline 23 can be cooled and lowered through the cooler (231), and a cooling medium is provided to the cooler (231) through the circulating water pipeline (232).

4. The hydraulic adjustment mechanism according to claim 3, characterized in that: The cooling medium is water.

5. The hydraulic adjustment mechanism according to claim 1, characterized in that: Pressure sensors (235) are provided on the oil supply pipeline (22) and the oil return pipeline (23) of the oil inlet and the oil outlet of the rear culvert ejector actuator (14) to monitor the pressure of the oil inlet and the oil outlet of the actuator (14).

6. The hydraulic adjustment mechanism according to claim 1 or 5, characterized in that: A temperature sensor (234) is provided on the side of the second one-way valve (233) in the oil return pipeline (23) close to the rear culvert ejector actuator (14) for monitoring the temperature of the oil returning to the hydraulic oil tank (21).

7. A hydraulic adjustment mechanism drive control system, used to realize drive control of the hydraulic adjustment mechanism according to any one of claims 1 to 6, characterized in that: The drive control system includes: a digital controller, a display module, a remote computer and a PLC control unit. The hydraulic adjustment mechanism and the PLC control unit are integrated on a unified operating platform; After the digital controller sends an excitation voltage signal to the rear duct ejector actuator (14), the linear displacement sensor built into the rear duct ejector actuator (14) starts to work and outputs voltage signals to the digital controller and the PLC control unit respectively; The PLC control unit processes the signal and feeds it back to the remote computer; The remote computer collects the operating parameters in real time and displays them through the display module; During the test, a remote computer is used to send an actuator action instruction to the PLC control unit, and the PLC control unit sends an execution instruction to the booster pump group, solenoid valve and electro-hydraulic servo valve on the hydraulic adjustment mechanism to execute the action.

8. A pneumatic test method for a rear duct ejector, wherein the hydraulic adjustment mechanism drive control system according to claim 7 is used to drive and control the hydraulic adjustment mechanism according to any one of claims 1 to 6, characterized in that: The test method includes: Non-pneumatic state debugging: Assemble the afterburner with the rear duct ejector onto the test bench and keep it in a horizontal position. Disconnect the actuator of the rear duct ejector from the driving load. Connect the oil supply and return pipes in the hydraulic adjustment mechanism to the oil inlet and return nozzles of each actuator of the rear duct ejector respectively. Start the pump of the hydraulic adjustment mechanism. Drive the actuator in forward and reverse strokes respectively. According to the output displacement value of the actuator linear displacement sensor, set equidistant steps to keep the actuator at this position. Record the working parameters of the hydraulic adjustment mechanism and complete the initial setting of the synchronous servo valve control logic. Reconnect the actuator of the rear duct ejector to the load, start the pump of the hydraulic adjustment mechanism, repeat the above process, and complete the first correction of the synchronous control logic of the electromagnetic servo valve. Pneumatic state debugging: provide internal and external duct airflow that meets the test state requirements to the afterburner inlet, carry out pneumatic state debugging of the rear duct ejector actuator, start the hydraulic adjustment mechanism pump, and complete the second correction of the electromagnetic servo valve control logic according to the non-pneumatic state debugging method. After this correction, the synchronous adjustment accuracy required by the test can be guaranteed; After the hydraulic adjustment mechanism is debugged, the aerodynamic test of the afterburner rear duct ejector is carried out according to the test process. The displacement of the rear duct ejector actuator and the aerodynamic state of the inner and outer ducts are adjusted in turn, and all test parameters are recorded.

9. The aerodynamic test method of the rear duct ejector according to claim 8, characterized in that: The displacement adjustment of the actuator cylinder is divided into synchronous mode and asynchronous mode; In the synchronous mode, the maximum working pressure of the hydraulic mechanism and the maximum displacement asynchronism of the actuator are set in advance using the display interface of the hydraulic drive control system, the booster pump group is started, the synchronous working mode of the actuator of the rear culvert ejector is selected, the displacement target value and movement speed are set, the servo valve is started, and the displacement adjustment of the actuator of the culvert ejector is completed; In the asynchronous mode, when the displacement asynchronism of the rear duct ejector exceeds the limit due to specific reasons, the synchronous mode is turned off and the asynchronous mode is started. According to the deviation between the actual displacement value and the target displacement value of different rear duct ejector actuators, the rear duct ejector actuators with large displacement value deviation are hydraulically driven separately, and the displacement is gradually approached to make the displacement value of the rear duct ejector actuator close to that of the rear duct ejector actuator with small deviation. The action is repeated until the displacement asynchronism between the rear duct ejector actuators meets the requirements, and then the operation is switched to the synchronous mode again.

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