An aeroengine airflow passage cleaning apparatus and method

Abstract

The application discloses an aero-engine airflow channel cleaning device and a cleaning method. The device comprises a vehicle body, an electrical cabinet assembly, a spray pipe assembly, a gas supply system and a hydraulic system. The vehicle body is used for carrying the electrical cabinet assembly and the hydraulic system. The hydraulic system comprises a vertical multi-stage centrifugal pump, a full-automatic self-suction electric pump and a liquid storage assembly. The liquid storage assembly is connected with the vertical multi-stage centrifugal pump and the full-automatic self-suction electric pump through pipelines respectively. The electrical cabinet assembly comprises a cabinet body and an operation control system. The operation control system is located in the cabinet body and is connected with the vertical multi-stage centrifugal pump and the full-automatic self-suction electric pump. The operation control system controls the hydraulic system to realize automatic cleaning of the engine airflow channel through a PLC controller. The gas supply system is used for supplying nitrogen with pressure into a ventilation cavity of an oil tank of the engine, so that deformation of the oil tank caused by excessive residual pressure can be prevented. The cleaning solution is supplied into the low-pressure compressor front end and the high-pressure compressor front end respectively, so that in-situ cleaning of the engine on the wing can be realized.

Description

Technical Field

[0001] This invention relates to a cleaning device, and more particularly to a cleaning device and method for cleaning the airflow passage of an aircraft engine. Background Technology

[0002] During operation, aircraft engines inevitably ingest foreign matter such as sand, dust, industrial pollution, and insects into their airflow channels. With prolonged use, deposits accumulate on critical components like blades and ducts within these channels, gradually distorting aerodynamic parameters and leading to performance degradation and increased exhaust temperature. Currently, the most effective solution is airflow channel cleaning. Aircraft engine airflow channel cleaning technology involves cleaning fan blades, compressor blades, combustion chambers, turbine blades, and other airflow channels without altering the engine's technical condition, removing surface deposits to restore the engine to its original factory performance. Civil aviation engine usage management regulations mandate airflow channel cleaning after a specified period of use to ensure engine performance and lifespan.

[0003] Traditional aircraft engine cleaning involves supplying cleaning solution from the front end of the low-pressure compressor. This method is ineffective for engines with medium to high bypass ratios. Firstly, with a fixed cleaning solution flow rate, the higher the bypass ratio, the smaller the flow rate of cleaning solution entering the high-pressure compressor and combustion chamber. A large amount of cleaning solution is discharged outside the engine through the low-pressure compressor and outer bypass duct, significantly reducing the cleaning effect. Secondly, during engine operation, oil, salt, carbon deposits, and other impurities accumulate in the airflow channels. These impurities are difficult to dissolve with water; therefore, the type of cleaning agent, cleaning pressure, and cleaning temperature all greatly affect the cleaning effect. Furthermore, critical components such as engine bearings and accessories require gas drawn from the low-pressure to high-pressure compressor for lubrication sealing to reduce oil consumption. However, when gas containing cleaning solution enters these components during cleaning, it not only affects the sealing effect but also contaminates the lubrication system, reducing its operational capacity. Summary of the Invention

[0004] To address the problem of ineffective airflow channel cleaning in existing aircraft engines, this invention provides an aircraft engine airflow channel cleaning device and method. This device and method can perform in-situ cleaning of engines that have been used for a long time or whose performance has deteriorated without changing the engine's technical condition, removing deposits in the airflow channels, thereby restoring engine performance and improving the reliability and economy of engine use.

[0005] The technical solution of this invention is:

[0006] An airflow passage cleaning device for an aircraft engine includes a vehicle body, an electrical cabinet assembly, and a hydraulic system 6;

[0007] The vehicle body is used to carry the electrical cabinet components and the hydraulic system 6;

[0008] The hydraulic system includes a vertical multistage centrifugal pump 15, a fully automatic self-priming electric pump 21, and a liquid storage assembly; the liquid storage assembly is connected to the vertical multistage centrifugal pump 15 and the fully automatic self-priming electric pump 21 respectively through pipelines.

[0009] The electrical cabinet assembly includes a cabinet, an operation control panel, and an operation control system 3. The operation control panel and operation control system 3 are located inside the cabinet. The operation control system 3 is connected to a vertical multistage centrifugal pump 15 and a fully automatic self-priming electric pump 21, and is used to control the hydraulic system 6 to clean the engine airflow passage.

[0010] Furthermore, it also includes an air supply system, which includes a nitrogen cylinder 22, a pressure reducing valve 23, a second pressure sensor 24, an air filter 25, and a third solenoid valve 26; the nitrogen cylinder 22, the air filter 25, and the third solenoid valve 26 are connected in sequence through connecting pipes, the second pressure sensor 24 and the third solenoid valve 26 are connected to the operation control system 3, and the exhaust port of the third solenoid valve 26 is connected to the oil tank ventilation chamber of the engine.

[0011] Furthermore, the liquid storage assembly includes a liquid storage tank 27, a level gauge 8, a stirrer 9, a temperature sensor 10, an electric heater 11, a first filter 12, a first solenoid valve 13, and a second solenoid valve 14; the level gauge 8 and the temperature sensor 10 are installed on the inner wall of the top of the liquid storage tank, and the first filter 12 is located on the inner wall of the bottom of the liquid storage tank 27; the first solenoid valve 13 and the second solenoid valve 14 are installed on the pipelines of the hydraulic system and are both connected to the operation control system 3.

[0012] Furthermore, the liquid storage tank 27 is connected to the vertical multistage centrifugal pump 15 and the fully automatic self-priming electric pump 21 through multiple pipelines, and the pipelines are equipped with a first solenoid valve or a second solenoid valve.

[0013] Furthermore, the storage tank 27 includes two compartments, one for holding the mixed cleaning solution and the other for holding distilled water; a level gauge 8, a temperature sensor 10, and an electric heater 11 are installed in both compartments; a stirrer 9 is located in the compartment holding the mixed cleaning solution.

[0014] Furthermore, the vertical multistage centrifugal pump 15 is connected to the engine airflow passage via a pipeline, on which are sequentially provided an overflow valve 16, a first pressure sensor 17, a second filter 18, a pressure regulating valve 19, a first solenoid valve 13, and a one-way valve 20; the overflow valve 16 and the pressure regulating valve 19 are arranged in parallel.

[0015] Furthermore, it also includes a tool cabinet, which comprises a cabinet body and a reel assembly; the cabinet body is divided into upper and lower layers, and the reel assembly includes a cleaning fluid hose reel, an air hose reel, and a cable reel; the tool cabinet is used to store the nozzle assembly.

[0016] Furthermore, the low-pressure nozzle assembly and the high-pressure nozzle assembly are respectively installed at both ends of the connecting hose (30); the low-pressure nozzle assembly includes a low-pressure hose (31), a low-pressure nozzle adapter (28) and a low-pressure nozzle (32), and the high-pressure nozzle assembly includes a high-pressure hose (29) and a high-pressure nozzle; both ends of the connecting hose include multiple interfaces, one end of the connecting hose (30) is connected to the pipeline output end of the hydraulic system (6) and the input end of the low-pressure hose (31) respectively, and the output end of the low-pressure hose (31) is connected to the low-pressure nozzle (32) through the low-pressure nozzle adapter (28); the other end of the connecting hose (30) is connected to the high-pressure hose (29), and both ends of the high-pressure hose (29) are connected to the high-pressure nozzle respectively.

[0017] Furthermore, the operation control system includes a PLC controller, a power supply, a pressure-level display instrument, and a temperature display controller. The PLC controller is used to receive pressure signals, temperature signals, and level signals collected by the hydraulic system and the air supply system, and to display them through the pressure-level display instrument and the temperature display controller.

[0018] A method for cleaning the airflow passage of an aircraft engine includes the following steps:

[0019] Step 1: Take out the suction tube from the fully automatic self-priming electric pump (21) and insert it into the distilled water tank or cleaning agent tank. Automatically control the addition of cleaning fluid to the liquid storage component of the hydraulic system (6) through the operation control system (3), and heat and stir the cleaning fluid.

[0020] Step 2: Install the low-pressure nozzle assembly at the air inlet of the engine's low-pressure compressor, and install the high-pressure nozzle assembly at the bottom inlet of the engine's high-pressure compressor separator casing.

[0021] Step 3: Connect the air supply system output port to the engine oil tank, turn on the air supply system, and adjust the nitrogen supply pressure according to the engine cleaning requirements.

[0022] Step 4: Disconnect the parts or pipes on the engine that need protection and seal them with plugs or caps;

[0023] Step 5: Start the operation control system and set the cleaning parameters; the hydraulic system works to provide cleaning agent and distilled water to the engine airflow passage for cleaning; the air supply system (5) supplies air to the engine oil tank ventilation chamber.

[0024] Invention Effects

[0025] The beneficial effects of this invention are as follows:

[0026] 1. This invention employs a method of supplying cleaning solution from the low-pressure compressor inlet and the high-pressure compressor separator casing inlet respectively. Without increasing the total cleaning solution flow rate, it increases the cleaning solution flow rate of the high-pressure compressor and combustion chamber, thereby improving the cleaning effect on the engine duct.

[0027] 2. In this invention, the temperature, pressure, and cleaning time of the cleaning solution are controlled by a PLC program. The appropriate cleaning solution temperature, pressure, and time can be set according to the type of air freshener used and the actual needs, thus avoiding unnecessary waste of the cleaning solution.

[0028] 3. In this invention, the air supply system is controlled by a PLC, which provides sealing gas pressure to the engine lubricating oil sealing part according to actual needs, to prevent gas containing cleaning solution from entering the sealing part and to prevent unnecessary damage to the engine during the cleaning process.

[0029] 4. The airflow channel cleaning equipment of this invention can perform in-situ cleaning of engines that have been used for a long time or whose performance has deteriorated, remove deposits on the surface of the airflow channel, improve the compressor's working efficiency and work capacity, thereby reducing the engine's fuel consumption rate and reducing fuel costs during aircraft use; it also avoids various failures caused by performance degradation and avoids the incurrence of secondary repair costs. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the structure in the open state;

[0032] Figure 3 for Figure 1 Schematic diagram of the central electrical cabinet;

[0033] Figure 4 for Figure 1 Schematic diagram of the hydraulic system;

[0034] Figure 5 for Figure 1 Schematic diagram of the gas supply system;

[0035] Figure 6 for Figure 1 Hydraulic and pneumatic schematic diagrams;

[0036] Figure 7 for Figure 1 Diagram showing the installation location of the central nozzle assembly.

[0037] The attached diagram shows the following labels: 1-Cleaning vehicle body; 2-Electrical cabinet; 3-Operation control system; 4-Tool cabinet; 5-Air supply system; 6-Hydraulic system; 7-Air filter; 8-Level gauge; 9-Agitator; 10-Temperature sensor; 11-Electric heater; 12-First filter; 13-First solenoid valve; 14-Second solenoid valve; 15-Vertical multistage centrifugal pump; 16-Relief valve; 17-First pressure sensor; 18-Second filter; 19-Pressure regulating valve; 20-Check valve; 21-Fully automatic self-priming electric pump; 22-Nitrogen cylinder; 23-Pressure reducing valve; 24-Second pressure sensor; 25-Air filter; 26-Third solenoid valve; 27-Reservoir tank; 28-Low-pressure nozzle adapter; 29-High-pressure hose; 30-Connecting hose; 31-Low-pressure hose; 32-Low-pressure nozzle; 33-First high-pressure nozzle; 34-Second high-pressure nozzle. Detailed Implementation

[0038] Reference Figures 1-7 This embodiment provides an airflow channel cleaning device for an aircraft engine, including a cleaning vehicle body 1, an electrical cabinet 2, an operation control system 3, a tool cabinet 4, an air supply system 5, and a hydraulic system 6. The electrical cabinet 2, tool cabinet 4, air supply system 5, and hydraulic system 6 are all installed on the cleaning vehicle body 1, while the operation control system 3 is located inside the electrical cabinet 2. In the hydraulic system, a fully automatic self-priming electric pump 21 and a first solenoid valve 13 are connected to a storage tank 27 via a threaded pipe. An air filter 7, a level gauge 8, a stirrer 9, a temperature sensor 10, an electric heater 11, and a first filter 12 are all fixedly installed on the storage tank. A vertical multistage centrifugal pump 15 draws cleaning fluid from the storage tank via a second solenoid valve 14, and discharges it through an overflow valve 16, a first pressure sensor 17, a second filter 18, a pressure regulating valve 19, the first pressure sensor 17, the first solenoid valve 13, and a check valve 2. The cleaning fluid pumped out by the nozzle assembly cleans the engine airflow passage. Excess liquid after pressure adjustment in the overflow valve 16 and pressure regulating valve 19 returns to the reservoir through the first solenoid valve 13. The air supply system includes components 22 to 26. Gas is supplied from nitrogen cylinder 22 to the lubricating oil tank through pressure reducing valve 23, second pressure sensor 24, air filter 25, third solenoid valve 26, and air hose reel. Excess cleaning fluid in the reservoir is discharged through the first solenoid valve 13. The hydraulic system includes two level gauges 8, a stirrer 9, two temperature sensors 10, four electric heaters 11, seven solenoid valves 13, two solenoid valves 14, a vertical multistage centrifugal pump 15, two first pressure sensors 17, and a fully automatic self-priming electric pump 21, all of which are connected to the operation control system 3. The second pressure sensor 24 and the third solenoid valve 26 in the air supply system are connected to the operation control system 3.

[0039] The cleaning vehicle body 1 includes a cleaning frame, a housing, and a towing device. The housing is located on the cleaning frame and has a front door, side doors, and a top door, facilitating the installation of the electrical cabinet 2, tool cabinet 4, air supply system 5, and hydraulic system 6. The cleaning vehicle body 1 is mainly used to install and support the hydraulic system 6, air supply system 5, operation control system 3, electrical cabinet 2, and tool cabinet 4, enabling short-distance transportation.

[0040] Reference Figure 3 The electrical cabinet 2 includes a cabinet body, a rotatable operation control panel, and an operation control system 3. The cabinet body is divided into upper and lower layers. The upper layer is equipped with a rotatable operation control panel, which includes instruments, switches, buttons, and indicator lights for controlling the system's operation. The lower layer is used to install the operation control system 3. The cabinet body has an outward-opening door, which is connected by a gas spring and hinges.

[0041] The operation control system 3 includes a power module, a Siemens programmable PLC controller, a pressure-level display, and a temperature display controller. The PLC controller receives switching signals from solenoid valves in the air supply and hydraulic systems, as well as analog signals from pressure sensors, level gauges, and temperature sensors. It integrates the control of solenoid valves, pressure sensors, temperature sensors, and level gauges in the air supply and hydraulic systems, and displays the received pressure, level, and temperature signals on the pressure-level display and temperature display controller. During engine cleaning, when the liquid level and temperature in the hydraulic system's reservoir and the pressure in the system pipelines meet the cleaning requirements, the PLC controller can control the solenoid valves on the hydraulic pipelines to open sequentially through a conventional control program. Conversely, when the system's level, temperature, and pressure signals do not meet the engine cleaning requirements, the PLC controller will automatically close the solenoid valves on the pipelines and issue an alarm.

[0042] The operation control system 3 can ensure that the airflow channel cleaning equipment can be controlled manually in stages and with highly centralized automatic control. When using automatic control, the system will automatically control the entire cleaning and air supply process. When using manual control, the cleaning process can be started or stopped manually item by item.

[0043] The tool cabinet includes a cabinet body and a cleaning nozzle storage box. The cabinet body is divided into upper and lower layers. The upper layer is used to store the nozzles, process plugs, process connectors and disassembly tools for cleaning the engine. The lower layer is equipped with three special reels: a cleaning fluid reel, an air reel, and a cable reel, which are used to store the cleaning fluid reel, the pressurized gas reel, and the cable, respectively.

[0044] Reference Figure 7The nozzle assembly includes a low-pressure nozzle adapter 28, a high-pressure hose 29, a connecting hose 30, a low-pressure hose 31, a low-pressure nozzle 32, and a high-pressure nozzle. The high-pressure nozzle includes a first high-pressure nozzle 33 and a second high-pressure nozzle 34. It also includes valves, plugs, and caps. The connecting hose 30 has two ports at each end. The output end of the cleaning solution pipeline in the hydraulic system 6 is connected to one port of the connecting hose 30, and the other port of the connecting hose 30 is connected to one end of the low-pressure hose 31. The other end of the low-pressure hose 31 is connected to the low-pressure nozzle 32 via the low-pressure nozzle adapter 28. The other end of the connecting hose 30 is connected to one end of the high-pressure hose 29, and both ends of the high-pressure hose 29 are connected to the input ends of the first high-pressure nozzle 33 and the second high-pressure nozzle 34, respectively. The low-pressure nozzle 32 is installed at the air inlet of the low-pressure compressor of the engine via the low-pressure nozzle adapter 28. The two high-pressure nozzles are installed at different inlets at the bottom of the separator casing of the high-pressure compressor of the engine. During cleaning, the cleaning solution in the reservoir of the hydraulic system 6 is delivered to the cleaning nozzles through the hydraulic system, and then sprayed out through the low-pressure nozzle 32 and the high-pressure nozzle nozzles respectively. The cleaning solution is supplied from the low-pressure compressor port and the high-pressure compressor port respectively, so as to effectively clean the dirt in the engine duct.

[0045] To prevent the accessories in the airflow channel and the accessories that draw air from the duct from being contaminated by the cleaning solution during the cleaning process, they must be protected with plugs and caps before cleaning.

[0046] Reference Figure 4 The hydraulic system 6 includes an air filter 7, a level gauge 8, a stirrer 9, a temperature sensor 10, an electric heater 11, a first filter 12, a first solenoid valve 13, a solenoid valve 14, a vertical multistage centrifugal pump 15, an overflow valve 16, a first pressure sensor 17, a second filter 18, a pressure regulating valve 19, a check valve 20, an automatic self-priming electric pump 21, and a storage tank 27. The hydraulic system 6 is used to add, stir, and heat the cleaning solution in the storage tank, and to pressurize and extract the cleaning solution during the cleaning process, ensuring that the pressure and flow rate of the cleaning solution in the cleaning nozzle meet the cleaning requirements. In addition, to ensure safe operation, the system is equipped with over-temperature alarm, level alarm, and low-liquidity alarm functions.

[0047] The storage tank 27 includes two compartments, one for holding a mixed solution and the other for holding distilled water. Level gauges 8 and temperature sensors 10 are installed on the covers of both compartments. An air filter 7 and a stirrer 9 are installed on the cover of the compartment containing the mixed solution, all connected via mounting brackets. Two electric heaters 11 are located at the front of the storage tank 27 and connected to the tank body 27 via flanges. A first filter 12 is located at the bottom of the storage tank 27. A first solenoid valve 13, a solenoid valve 14, a check valve 20, an overflow valve 16, a second filter 18, a pressure regulating valve 19, a first pressure sensor 17, etc., are all installed on pipelines located in the hydraulic system 6.

[0048] The vertical multistage centrifugal pump 15 and the fully automatic self-priming electric pump 21 are located on the frame of the cleaning vehicle 1 and are connected to the frame by bolts; they are also connected to the pipeline by a movable joint; the nitrogen cylinder 22 is located on the frame of the cleaning vehicle 1 and is fixed by a support.

[0049] The vertical multistage centrifugal pump 15, the first solenoid valve 13, the second solenoid valve 14, the third solenoid valve 26, and the fully automatic self-priming electric pump 21 are respectively connected to the operation control system 3 via cables, and the system integration control is realized through a PLC programmable controller.

[0050] Reference Figure 6 The gas supply system 5 includes a nitrogen cylinder 22, a pressure reducing valve 23, a pressure transmitter 24, an air filter 25, and a third solenoid valve 26. The nitrogen cylinder 22, the air filter 25, and the third solenoid valve 26 are connected by a connecting pipe and are threaded to the pipeline. The gas supply system is used to supply pressurized nitrogen to the ventilation chamber of the engine's oil tank to prevent the oil tank from deforming and being damaged due to excessive residual pressure.

[0051] A method for cleaning the airflow passage of an aircraft engine includes the following steps:

[0052] Step 1: Take out the suction tube from the fully automatic self-priming electric pump 21 and insert it into the distilled water tank or cleaning agent tank. The cleaning fluid is automatically added to the storage tank in the hydraulic system 6 through the operation control system 3, and the cleaning fluid is heated and stirred.

[0053] Step 2: Connect the low-pressure nozzle adapter 28, high-pressure hose 29, connecting hose 30, low-pressure hose 31, low-pressure nozzle 32, first high-pressure nozzle 33, and second high-pressure nozzle 34 to the cleaning fluid hose reel in the tool cabinet 3. After connecting, fix the above pipelines to the engine cleaning position.

[0054] Step 3: Open the valve on nitrogen cylinder 22 and adjust the nitrogen supply pressure through pressure reducing valve 23 on the gas supply system to meet the engine cleaning requirements.

[0055] Step 4: Disconnect the accessories and pipes on the engine that need protection, seal them with plugs and caps stored in tool cabinet 4, and remove the vent connector of the engine oil tank and replace it with the air hose reel connector in the air supply system.

[0056] Step 5: Start the operation control system 3 and set the cleaning parameters. The operation control system 3 automatically controls the hydraulic system 6 to provide cleaning agent and distilled water to the engine airflow passage for cleaning. During the cleaning process, the operation control system 3 also automatically controls the air supply system 5 to supply air to the engine oil tank ventilation chamber to prevent the oil tank from deforming and being damaged due to excessive residual pressure.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made by those skilled in the art to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention are all covered within the protection scope of the present invention.

Claims

1. A cleaning device for the airflow passage of an aircraft engine, characterized in that, Including the vehicle body, electrical cabinet components, nozzle components, air supply system and hydraulic system (6); The vehicle body is used to carry electrical cabinet components and hydraulic systems (6); The hydraulic system includes a vertical multistage centrifugal pump (15), a fully automatic self-priming electric pump (21), and a liquid storage assembly; the liquid storage assembly is connected to the vertical multistage centrifugal pump (15) and the fully automatic self-priming electric pump (21) respectively through pipelines; The nozzle assembly is connected to the output end of the hydraulic system pipeline. The nozzle assembly includes a low-pressure nozzle assembly and a high-pressure nozzle assembly. The output end of the low-pressure nozzle assembly is installed at the air inlet end of the low-pressure compressor of the engine, and the output end of the high-pressure nozzle assembly is installed on the separator box of the high-pressure compressor of the engine. The low-pressure nozzle assembly and the high-pressure nozzle assembly are respectively installed at both ends of the connecting hose (30); the low-pressure nozzle assembly includes a low-pressure hose (31), a low-pressure nozzle adapter (28) and a low-pressure nozzle (32), and the high-pressure nozzle assembly includes a high-pressure hose (29) and a high-pressure nozzle; the connecting hose has multiple interfaces at both ends, one end of the connecting hose (30) is connected to the pipeline output end of the hydraulic system (6) and the input end of the low-pressure hose (31) respectively, and the output end of the low-pressure hose (31) is connected to the low-pressure nozzle (32) through the low-pressure nozzle adapter (28); the other end of the connecting hose (30) is connected to the high-pressure hose (29), and both ends of the high-pressure hose (29) are connected to the high-pressure nozzle; The electrical cabinet assembly includes a cabinet and an operation control system (3). The operation control system (3) is located inside the cabinet and is connected to a vertical multistage centrifugal pump (15), a fully automatic self-priming electric pump (21), and an air supply system. It is used to control the hydraulic system (6) to automatically clean the engine airflow passage. The gas supply system is connected to the engine oil tank and is used to supply pressurized nitrogen to the engine oil tank ventilation chamber. The gas supply system includes a nitrogen cylinder (22), a pressure reducing valve (23), a second pressure sensor (24), an air filter (25), and a third solenoid valve (26). The nitrogen cylinder (22), the air filter (25), and the third solenoid valve (26) are connected in sequence through connecting pipes. The second pressure sensor (24) and the third solenoid valve (26) are connected to the operation control system (3). The exhaust port of the third solenoid valve (26) is connected to the engine oil tank ventilation chamber.

2. The aero-engine airflow passage cleaning equipment as described in claim 1, characterized in that, The liquid storage assembly includes a liquid storage tank (27), a level gauge (8), a stirrer (9), a temperature sensor (10), an electric heater (11), a first filter (12), a first solenoid valve (13), and a second solenoid valve (14); the level gauge (8) and the temperature sensor (10) are installed on the inner wall of the top of the liquid storage tank, and the first filter (12) is located on the inner wall of the bottom of the liquid storage tank (27); the first solenoid valve (13) and the second solenoid valve (14) are installed on the pipeline of the hydraulic system and are both connected to the operation control system (3).

3. The aero-engine airflow passage cleaning equipment as described in claim 2, characterized in that, The liquid storage tank (27) is connected to the vertical multistage centrifugal pump (15) and the fully automatic self-priming electric pump (21) through multiple pipelines, and the pipelines are equipped with a first solenoid valve or a second solenoid valve.

4. The aero-engine airflow passage cleaning equipment as described in claim 3, characterized in that, The storage tank (27) includes two chambers, one for holding the mixed cleaning solution and the other for holding distilled water; a level gauge (8), a temperature sensor (10) and an electric heater (11) are installed in both chambers; a stirrer (9) is located in the chamber holding the mixed cleaning solution.

5. The aero-engine airflow passage cleaning equipment as described in claim 4, characterized in that, The vertical multistage centrifugal pump (15) is connected to the engine airflow channel via a pipeline, which is provided with an overflow valve (16), a first pressure sensor (17), a second filter (18), a pressure regulating valve (19), a first solenoid valve (13), and a check valve (20) in sequence; the overflow valve (16) and the pressure regulating valve (19) are arranged in parallel.

6. The aero-engine airflow passage cleaning equipment as described in claim 1, characterized in that, It also includes a tool cabinet, which comprises a cabinet body and a reel assembly; the cabinet body is divided into upper and lower layers, and the reel assembly includes a cleaning fluid hose reel, an air hose reel, and a cable reel; the tool cabinet is used to store the nozzle assembly.

7. The aero-engine airflow passage cleaning equipment as described in claim 1, characterized in that, The operation control system includes a PLC controller, a pressure-level display instrument, and a temperature display controller. The PLC controller is used to receive pressure signals, temperature signals, and level signals collected by the hydraulic system and the air supply system, and to display them through the pressure-level display instrument and the temperature display controller.

8. A method for cleaning the airflow passage of an aero-engine, characterized in that, The airflow passage cleaning equipment for an aircraft engine according to any one of claims 1-7 is used; the airflow passage cleaning method for an aircraft engine includes the following steps: Step 1: Take out the suction tube on the fully automatic self-priming electric pump (21) and insert it into the distilled water tank or cleaning agent tank. Automatically control the cleaning fluid to be added to the liquid storage component of the hydraulic system (6) through the operation control system (3), and heat and stir the cleaning fluid. Step 2: Install the low-pressure nozzle assembly at the air inlet of the engine's low-pressure compressor, and install the high-pressure nozzle assembly at the bottom inlet of the engine's high-pressure compressor separator casing. Step 3: Connect the air supply system output port to the engine oil tank, turn on the air supply system, and adjust the nitrogen supply pressure according to the engine cleaning requirements. Step 4: Disconnect the parts or pipes on the engine that need protection and seal them with plugs or caps; Step 5: Start the operation control system and set the cleaning parameters; the hydraulic system works to provide cleaning agent and distilled water to the engine airflow passage for cleaning; the air supply system (5) supplies air to the engine lubricating oil box ventilation chamber.

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