Aircraft auxiliary fuel tank high pressure flushing system and method

Abstract

The present invention provides a high-pressure flushing system and method for an aircraft auxiliary fuel tank, which includes an oil tank for containing cleaning fluid, an oil suction filter is arranged inside the oil tank, the oil suction filter is connected to an oil supply motor pump group, the outlet of the oil supply motor pump group is connected to an oil filter group, a flow meter is connected to the pipeline after the oil filter group, an electric three-way ball valve is connected after the flow meter, one branch of the electric three-way ball valve is connected to an oil return pipe through a connecting pipe, and the oil return pipe is connected to the fuel tank through an oil return filter; the other branch of the electric three-way ball valve is connected to the auxiliary fuel tank to be cleaned, and the outlet of the auxiliary fuel tank is connected to a flow meter and an oil return motor pump group. This system can be used to provide high-pressure cleaning fluid during the cleaning process of the aircraft auxiliary fuel tank, thereby thoroughly flushing away the oil stains and potential pollutants deposited on the inner wall of the auxiliary fuel tank.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft fuel tank cleaning, and in particular to a high-pressure flushing system and method for an aircraft auxiliary fuel tank. Background Art

[0002] During the inspection and maintenance of the aircraft auxiliary fuel tank, its internal cavity needs to be cleaned. During the cleaning process, aviation kerosene needs to be used for cleaning. In order to ensure the cleaning effect, high-pressure flushing is required. At this time, it is necessary to design a corresponding flushing system to provide high-pressure flushing media. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-pressure flushing system for aircraft auxiliary fuel tanks. This system can be used to provide high-pressure cleaning fluid during the cleaning process of aircraft auxiliary fuel tanks, thereby thoroughly flushing away oil stains and potential pollutants deposited on the inner wall of the auxiliary fuel tank.

[0004] In order to realize the above-mentioned technical features, the object of the present invention is realized as follows: an aircraft auxiliary fuel tank high-pressure flushing system, which includes a fuel tank for containing cleaning fluid, an oil suction filter is arranged inside the fuel tank, the oil suction filter is connected to the fuel supply motor pump group, the outlet of the fuel supply motor pump group is connected to the oil filter group, a flow meter is connected to the pipeline after the oil filter group, an electric three-way ball valve is connected after the flow meter, one branch of the electric three-way ball valve is connected to the oil return pipe through a connecting pipe, and the oil return pipe is connected to the fuel tank through the oil return filter; the other branch of the electric three-way ball valve is connected to the auxiliary fuel tank to be cleaned, and the outlet of the auxiliary fuel tank is connected to the flow meter and the oil return motor pump group.

[0005] A temperature sensor, a pressure sensor and an in-situ metering port are sequentially installed on the pipeline between the oil filter group and the flow meter.

[0006] The oil supply motor pump group adopts a gear pump as a cleaning power source, which is used to add kerosene to the auxiliary oil tank before rotation cleaning, and is used to provide a certain pressure flushing source to the auxiliary oil tank during pressure cleaning.

[0007] An oil online detector is installed on the oil return pipe and before the oil return filter.

[0008] A temperature sensor and a sampling valve are installed on the oil return pipe and between the oil return motor pump group and the oil online detector.

[0009] An electric proportional overflow valve is installed on the pipeline between the outlet of the oil supply motor pump group and the oil filter group.

[0010] The oil suction filter, oil filter group and oil return filter all use pressure differential alarm oil filters with large flow specifications.

[0011] The oil online detector is used to detect the quality level of the system self-circulation and auxiliary oil tank recovery oil, and has a built-in printer to print the detection report in real time.

[0012] A method for flushing aircraft auxiliary fuel tanks using an aircraft auxiliary fuel tank high-pressure flushing system adopts a fixed fuel tank as a cleaning oil source and is equipped with an oil supply motor pump group and an oil return motor pump group to achieve the filling of cleaning oil, pressure flushing, oil recovery and oil self-cleaning during the auxiliary fuel tank cleaning process.

[0013] The specific method of filling the cleaning oil before rotating and cleaning the auxiliary oil tank is as follows:

[0014] The electric three-way ball valve switches the system oil circuit to the oil supply branch circuit. The oil supply motor pump group extracts the cleaning oil inside the oil tank, and after filtering by the oil filter group, it is added to the auxiliary oil tank through the gravity refueling port of the auxiliary oil tank. Before refueling, first open the auxiliary oil tank boost interface, and use a special plug to reliably block the sensor interface and oil pipeline interface on the auxiliary oil tank. After the oil filling is completed, use a special plug to block the boost port to prevent the gas in the auxiliary oil tank from being damaged by failure to be discharged in time during the oil filling. The flow meter is used to monitor the instantaneous flow rate and the total flow rate of the cleaning oil filling;

[0015] The specific method for recovering the cleaning oil after the auxiliary oil tank is rotated and cleaned is:

[0016] After the auxiliary oil tank is rotated and cleaned, the cleaned oil is pumped back to the equipment oil tank from the sensor interface of the auxiliary oil tank through the oil return motor pump group. The oil return branch is equipped with an oil return filter and an oil online detector. The cleaned oil is tested online and filtered and purified before being stored in the oil tank for standby use. Before the oil is pumped back to the oil tank, the boost port plug should also be opened first to keep the air pressure in the oil tank unobstructed with the atmosphere to prevent vacuum from forming in the oil tank during oil pumping and damaging the oil tank. The flow meter is used to monitor the instantaneous flow rate and the total flow rate of the oil when it is pumped out.

[0017] The specific method of pressure washing is:

[0018] The auxiliary oil tank pressure flushing is uniformly filled with cleaning oil from the sensor interface, and the flushing joint adopts a graded flushing joint to allow the flushing oil to fully diffuse inside the tank to achieve segmented pressure flushing of the auxiliary oil tank;

[0019] K / UZC 1700 auxiliary oil tank oil pressure flushing method:

[0020] The pressure flushing of the auxiliary oil tank adopts the pressure supply circulation mode. The electric three-way ball valve switches the system oil circuit to the oil supply branch. The oil supply motor pump group extracts and pressurizes the oil in the oil tank. The oil is injected into the oil tank from the sensor interface of the auxiliary oil tank through the customized oil filling joint. There are three sensor interfaces on the auxiliary oil tank, which are located in the front section, middle section and rear section respectively. During pressure cleaning, the equipment separately and sequentially injects oil from each sensor joint of the 1st, 2nd and 3rd branches, and flushes different positions of the inner wall of the oil tank in steps;

[0021] While flushing, the oil return motor pump group draws the cleaning oil from the remaining sensor interfaces of the auxiliary oil tank back to the oil tank through the oil return branch, that is, when the oil is injected from interfaces No. 1 and No. 3 respectively, the oil is pumped from the oil suction line of interface No. 2; when the oil is injected from interface No. 2, the oil is pumped from the oil suction line of interface No. 3;

[0022] An oil online detector is installed on the oil return branch to detect the quality level of the flushing oil in real time, and then indirectly detect the flushing effect. In addition, the oil return filter on the oil return line purifies the flushing oil to increase the oil reuse rate;

[0023] In order to control the oil balance inside the auxiliary oil tank during pressure supply cycle flushing, the flow meter monitors the instantaneous filling flow, total filling flow, instantaneous flow when the oil tank is pumped out, and total pumping flow of the system in real time. The control system collects various flow values ​​for calculation and periodically controls the output of the pump group to achieve a stable cycle of the system. Under the above high-pressure flushing conditions, the auxiliary oil tank booster interface should be opened to keep the auxiliary oil tank connected to the atmosphere to prevent damage to the tank caused by abnormal air pressure inside the auxiliary oil tank.

[0024] FYX-800B auxiliary oil tank oil pressure flushing method:

[0025] The flushing principle is the same as that of the K / UZC 1700 auxiliary oil tank. The oil is also injected from the sensor joints at both ends of the oil tank in sequence and separately, and different positions on the inner wall of the oil tank are flushed. The recovery of the oil after cleaning is the same as that of the K / UZC 1700 auxiliary oil tank. The oil is extracted from the non-oiled sensor interface.

[0026] When flushing, open the auxiliary tank booster interface to keep the auxiliary tank connected to the atmosphere to prevent damage to the tank caused by abnormal air pressure inside the auxiliary tank. The flow meter monitors the system flow in real time and periodically controls the output of the pump group to ensure stable circulation of the system.

[0027] Specific method of oil self-cleaning:

[0028] The equipment switches the system oil circuit to the self-circulating branch through an electric three-way ball valve. The oil supply motor pump group is used to drive the oil in the oil tank to circulate. During the circulation process, the cleaning oil in the oil tank is filtered through the oil filter in the pipeline to achieve the purpose of oil purification and self-cleaning.

[0029] The present invention has the following beneficial effects:

[0030] 1. Since the auxiliary fuel tank is a closed structure, in order to achieve the purpose of completely cleaning the inside of the tank when it rotates, it is cleaned by filling it with kerosene and flushing it to thoroughly rinse the oil stains and potential pollutants deposited on the inner wall of the tank. In addition, the high-field cleaning of the present invention can be used to rotate the aircraft auxiliary fuel tank during cleaning, thereby improving its cleaning quality and effect.

[0031] 2. The inner cavity pressure flushing uses a gear pump as the flushing power source to improve the oil absorption capacity and stabilize the pressure supply.

[0032] 3. The pressure flushing system adopts electric proportional relief valve to adjust the pressure, and is equipped with pressure sensor and flow meter, and has automatic software and hardware overpressure protection and automatic control of oil tank oil level.

[0033] 4. Equipped with an embedded online oil contamination detector and a built-in printer to detect the quality of the cleaning oil in real time and print the test report.

[0034] 5. The oil supply motor pump group plans to use a gear pump as the cleaning power source, which can be used to add kerosene to the auxiliary oil tank before rotary cleaning, and can also be used to provide a certain pressure flushing source to the auxiliary oil tank during pressure cleaning. It can also be used for oil self-circulation, and the matching frequency conversion motor can realize the adjustment of the output flow.

[0035] 6. The oil return motor pump group is used to pump the cleaning oil deposited in the auxiliary oil tank back to the oil tank at the end of rotary cleaning or pressure cleaning to complete oil recovery.

[0036] 7. The system pressure regulation is limited and adjusted by the electric proportional relief valve.

[0037] 8. The temperature sensor is used to monitor the temperature of the system cleaning oil. When the oil temperature exceeds the set value, the machine will be shut down and an alarm will be sounded immediately to prevent the oil temperature from rising during the cleaning process and causing a fire hazard.

[0038] 9. The pressure sensor configured in the system is used to monitor the system operating pressure. When it exceeds the maximum value, it will immediately shut down and alarm.

[0039] 10. The in-situ metering port is used for in-situ metering pressure sensor.

[0040] 11. The flow meter is used to monitor the instantaneous flow and cumulative flow at the inlet and outlet of the auxiliary oil tank, which is convenient for controlling the flushing process of the auxiliary oil tank.

[0041] 12. The electric three-way ball valve is used to switch the system's self-circulation purification mode and oil supply working mode.

[0042] 13. The sampling valve is used to take samples of the cleaning oil for on-site testing.

[0043] 14. The oil online tester is used to detect the quality level of the system's self-circulation and the oil recovered in the auxiliary oil tank. It has its own printer and can print the test report in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] Figure 1 It is a schematic diagram of the hydraulic principle of the present invention.

[0046] Figure 2 The principle diagram is added to the present invention.

[0047] Figure 3 The figure is a schematic diagram of the oil recovery principle of the K / UZC 1700 auxiliary oil tank of the present invention.

[0048] Figure 4 This is a schematic diagram of the pressure flushing principle of the K / UZC 1700 auxiliary oil tank of the present invention.

[0049] Figure 5 This is a schematic diagram of the self-circulation purification principle of the present invention.

[0050] In the figure: 1-oil tank, 2-oil suction filter, 3-oil supply motor pump group, 4-electric proportional relief valve, 5-oil filter group, 6-temperature sensor, 7-pressure sensor, 8-in-situ metering port, 9-flow meter, 10-electric three-way ball valve, 11. Return oil motor pump group, 12-sampling valve, 13-oil online detector, 14-return oil filter. DETAILED DESCRIPTION

[0051] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0052] Embodiment 1:

[0053] See also Figure 1-5, an aircraft auxiliary fuel tank high-pressure flushing system, which includes an oil tank 1 for containing cleaning fluid, an oil suction filter 2 is arranged inside the oil tank 1, the oil suction filter 2 is connected to the oil supply motor pump group 3, the outlet of the oil supply motor pump group 3 is connected to the oil filter group 5, a flow meter 9 is connected to the pipeline after the oil filter group 5, an electric three-way ball valve 10 is connected after the flow meter 9, one branch of the electric three-way ball valve 10 is connected to the oil return pipe through a connecting pipe, and the oil return pipe is connected to the oil tank 1 through the oil return filter 14; the other branch of the electric three-way ball valve 10 is connected to the auxiliary fuel tank to be cleaned, and the outlet of the auxiliary fuel tank is connected to the flow meter and the oil return motor pump group 11. This system can be used to provide high-pressure cleaning fluid during the cleaning process of the aircraft auxiliary fuel tank, thereby thoroughly flushing the oil stains and potential pollutants deposited on the inner wall of the auxiliary fuel tank. Equipped with two sets of motor pump groups as the power source for filling, pressure supply and cleaning, and oil return assist power source respectively, it can realize the filling, pressure flushing and oil recovery of the auxiliary oil tank cleaning oil.

[0054] Furthermore, a temperature sensor 6, a pressure sensor 7 and an in-situ metering port 8 are sequentially installed on the pipeline between the oil filter group 5 and the flow meter 9. The temperature sensor 6 is used to monitor the temperature of the cleaning oil of the system. When the oil temperature exceeds the setting, the system will be shut down and an alarm will be sounded immediately to prevent the oil temperature from rising during the cleaning process and causing a fire hazard. The pressure sensor 7 is used to monitor the operating pressure of the system. When it exceeds the maximum value, the system will be shut down and an alarm will be sounded immediately. The in-situ metering port 8 is used to measure the pressure sensor in-situ.

[0055] Furthermore, the oil supply motor pump group 3 uses a gear pump as a cleaning power source, which is used to add kerosene to the auxiliary oil tank before rotation cleaning, and to provide a certain pressure flushing source to the auxiliary oil tank during pressure cleaning. It can also be used for oil self-circulation, and the matching variable frequency motor can realize the adjustment of the output flow.

[0056] Furthermore, an oil online detector 13 is installed on the oil return pipe and before the oil return filter 14. The oil online detector 13 is used to detect the quality level of the system self-circulation and the auxiliary oil tank recovery oil, and has a built-in printer to print the test report in real time.

[0057] Further, a temperature sensor 6 and a sampling valve 12 are installed on the oil return pipe and between the oil return motor pump group 11 and the oil online detector 13. The sampling valve 12 is used to sample the cleaning oil and then perform field testing.

[0058] Furthermore, an electric proportional overflow valve 4 is installed on the pipeline between the outlet of the oil supply motor pump group 3 and the oil filter group 5. The electric proportional overflow valve 4 is used for limiting and adjusting.

[0059] Furthermore, the oil suction filter 2, the oil filter group 5 and the oil return filter 14 are all pressure differential alarm oil filters with large flow specifications.

[0060] Furthermore, the oil online detector 13 is used to detect the quality level of the system self-circulation and the auxiliary oil tank recovery oil, and has a built-in printer to print the detection report in real time.

[0061] Embodiment 2:

[0062] A method for flushing an aircraft auxiliary fuel tank using an aircraft auxiliary fuel tank high-pressure flushing system adopts a fixed fuel tank 1 as a cleaning oil source, and is equipped with an oil supply motor pump group 3 and an oil return motor pump group 11 to achieve the filling of cleaning oil, pressure flushing, oil recovery and oil self-cleaning during the auxiliary fuel tank cleaning process.

[0063] The specific method of filling the cleaning oil before rotating and cleaning the auxiliary oil tank is as follows:

[0064] See also Figure 2 , the electric three-way ball valve 10 switches the system oil circuit to the oil supply branch, and the oil supply motor pump group 3 extracts the cleaning oil inside the oil tank 1, and adds it to the auxiliary oil tank through the gravity refueling port of the auxiliary oil tank after filtering by the oil filter group 5. Before refueling, first open the auxiliary oil tank boost interface, and use a special plug to reliably block the sensor interface and the oil pipeline interface on the auxiliary oil tank. After the oil filling is completed, use a special plug to block the boost port to prevent the gas in the auxiliary oil tank from being damaged by failure to be discharged in time during the oil filling. The flow meter is used to monitor the instantaneous flow rate and the total filling flow rate of the cleaning oil during filling;

[0065] The specific method for recovering the cleaning oil after the auxiliary oil tank is rotated and cleaned is:

[0066] See also Figure 3 After the auxiliary oil tank is rotated and cleaned, the cleaned oil is pumped back to the equipment oil tank 1 from the sensor interface of the auxiliary oil tank through the oil return motor pump group 11. The oil return branch is provided with an oil return filter 14 and an oil online detector 13. The cleaned oil is tested online and filtered and purified before being stored in the oil tank for standby use. Before the oil is pumped back to the oil tank, the boost port plug should also be opened first to keep the air pressure in the oil tank unobstructed with the atmosphere to prevent the formation of vacuum in the oil tank during oil pumping and damage to the oil tank; the flow meter 9 is used to monitor the instantaneous flow rate and the total flow rate of the oil when it is extracted;

[0067] The specific method of pressure washing is:

[0068] The auxiliary oil tank pressure flushing is uniformly filled with cleaning oil from the sensor interface, and the flushing joint adopts a graded flushing joint to allow the flushing oil to fully diffuse inside the tank to achieve segmented pressure flushing of the auxiliary oil tank;

[0069] K / UZC 1700 auxiliary oil tank oil pressure flushing method:

[0070] See also Figure 4The auxiliary oil tank pressure flushing adopts the pressure supply circulation mode. The electric three-way ball valve 10 switches the system oil circuit to the oil supply branch. The oil supply motor pump group 3 extracts and pressurizes the oil in the oil tank. The oil is injected into the oil tank from the sensor interface of the auxiliary oil tank through the customized oil filling joint. There are three sensor interfaces arranged on the auxiliary oil tank, which are located in the front section, middle section and rear section respectively. During pressure cleaning, the equipment separately and sequentially injects oil from each sensor joint of branches 1, 2 and 3, and flushes different positions of the inner wall of the oil tank in steps.

[0071] While flushing, the oil return motor pump group 11 draws the cleaning oil from the remaining sensor interfaces of the auxiliary oil tank back to the oil tank through the oil return branch, that is, when the oil is injected from interfaces No. 1 and No. 3 respectively, the oil is pumped from the oil suction line of interface No. 2; when the oil is injected from interface No. 2, the oil is pumped from the oil suction line of interface No. 3;

[0072] An oil online detector 13 is provided on the oil return branch line to detect the quality level of the flushing oil in real time, and then indirectly detect the flushing effect. In addition, the return oil filter 14 on the oil return line purifies the flushing oil to improve the reuse rate of the oil;

[0073] In order to control the oil balance inside the auxiliary oil tank during pressure supply cycle flushing, the flow meter 9 monitors the instantaneous filling flow, total filling flow, instantaneous flow when the oil tank is pumped out, and total pumping flow of the system in real time. The control system collects each flow value for calculation and periodically controls the output of the pump group to achieve a stable circulation of the system. Under the above high-pressure flushing conditions, the auxiliary oil tank booster interface should be opened to keep the auxiliary oil tank connected to the atmosphere to prevent the abnormal air pressure inside the auxiliary oil tank from causing damage to the tank.

[0074] FYX-800B auxiliary oil tank oil pressure flushing method:

[0075] The flushing principle is the same as that of the K / UZC 1700 auxiliary oil tank. The oil is also injected from the sensor joints at both ends of the oil tank in sequence and separately, and different positions on the inner wall of the oil tank are flushed. The recovery of the oil after cleaning is the same as that of the K / UZC 1700 auxiliary oil tank. The oil is extracted from the non-oiled sensor interface.

[0076] When flushing, open the auxiliary tank booster interface to keep the auxiliary tank connected to the atmosphere to prevent damage to the tank caused by abnormal air pressure inside the auxiliary tank. The flow meter monitors the system flow in real time and periodically controls the output of the pump group to ensure stable circulation of the system.

[0077] Specific method of oil self-cleaning:

[0078] See also Figure 5The equipment switches the system oil circuit to the self-circulating branch through the electric three-way ball valve 10. The oil supply motor pump group 3 is used to drive the oil in the oil tank to circulate. During the circulation process, the cleaning oil in the oil tank is filtered through the oil filter in the pipeline to achieve the purpose of oil purification and self-cleaning.

Claims

1. A method for flushing an aircraft auxiliary fuel tank by using a high-pressure flushing system for an aircraft auxiliary fuel tank, characterized in that: An aircraft auxiliary fuel tank high-pressure flushing system comprises an oil tank (1) for containing a cleaning liquid, wherein an oil suction filter (2) is arranged inside the oil tank (1), wherein the oil suction filter (2) is connected to an oil supply motor pump group (3), wherein the outlet of the oil supply motor pump group (3) is connected to an oil filter group (5), wherein a flow meter (9) is connected to the pipeline after the oil filter group (5), wherein an electric three-way ball valve (10) is connected after the flow meter (9), wherein one branch of the electric three-way ball valve (10) is connected to an oil return pipe via a connecting pipe, wherein the oil return pipe is connected to the oil tank (1) via an oil return filter (14); wherein the other branch of the electric three-way ball valve (10) is connected to an auxiliary fuel tank to be cleaned, wherein the outlet of the auxiliary fuel tank is connected to a flow meter and an oil return motor pump group (11); A temperature sensor (6), a pressure sensor (7) and an in-situ metering port (8) are sequentially installed on the pipeline between the oil filter group (5) and the flow meter (9); The oil supply motor pump group (3) uses a gear pump as a cleaning power source, and is used to fill the auxiliary oil tank with cleaning oil before rotation cleaning; An oil online detector (13) is installed on the oil return pipe and in front of the oil return filter (14); A temperature sensor (6) and a sampling valve (12) are installed on the oil return pipe and on the pipeline between the oil return motor pump group (11) and the oil online detector (13); The temperature sensor is used to monitor the temperature of the cleaning oil in the system. When the oil temperature exceeds the set value, the system will be shut down and an alarm will be sounded immediately to prevent the oil temperature from rising during the cleaning process and causing a fire hazard. The flushing method adopts a fixed oil tank (1) as a cleaning oil source, and is equipped with an oil supply motor pump group (3) and an oil return motor pump group (11), so as to realize the filling of cleaning oil, high-pressure flushing, oil recovery and oil self-cleaning during the auxiliary oil tank cleaning process; The specific method of filling the cleaning oil before rotating and cleaning the auxiliary oil tank is as follows: The electric three-way ball valve (10) switches the system oil circuit to the oil supply branch circuit, and the oil supply motor pump group (3) extracts the cleaning oil in the oil tank (1), and after being filtered by the oil filter group (5), the cleaning oil is added to the auxiliary oil tank through the gravity filling port of the auxiliary oil tank. Before filling, the auxiliary oil tank boost interface is first opened, and the sensor connector and the oil pipe interface on the auxiliary oil tank are reliably blocked with a special plug. After the oil filling is completed, the boost interface is blocked with a special plug to prevent the gas in the auxiliary oil tank from being damaged due to failure to be discharged in time during the oil filling. The flow meter is used to monitor the instantaneous flow rate and the total filling flow rate of the cleaning oil during the filling. The specific method for recovering the cleaning oil after the auxiliary oil tank is rotated and cleaned is: After the auxiliary oil tank is rotated and cleaned, the cleaned oil is pumped back to the oil tank (1) from the sensor joint of the auxiliary oil tank through the oil return motor pump group (11). The oil return pipe is provided with an oil return filter (14) and an oil online detector (13). The cleaned oil is tested online and filtered and purified before being stored in the oil tank for later use. Before the oil is pumped back to the oil tank, the booster interface plug should also be opened first to keep the air pressure in the oil tank unobstructed with the atmosphere to prevent vacuum from forming in the oil tank during oil pumping and damaging the oil tank. The flow meter (9) is used to monitor the instantaneous flow rate and the total flow rate of the oil when it is pumped out. The specific method of high pressure washing is: The high-pressure flushing of the auxiliary fuel tank is uniformly filled with cleaning oil from the sensor joint, and the flushing joint adopts a graded flushing joint to allow the cleaning oil to fully spread inside the auxiliary fuel tank to achieve segmented high-pressure flushing of the auxiliary fuel tank; K / UZC 1700 auxiliary oil tank oil high pressure flushing method: The auxiliary oil tank high-pressure flushing adopts a pressure supply circulation mode. The electric three-way ball valve (10) switches the system oil circuit to the oil supply branch circuit. The oil supply motor pump group (3) extracts and pressurizes the oil in the oil tank. The oil is injected from the sensor connector of the auxiliary oil tank through a customized oil injection connector. The auxiliary oil tank is provided with three sensor connectors, which are located at the front section, the middle section and the rear section respectively. During high-pressure flushing, oil is injected from each sensor connector of the 1st, 2nd and 3rd branches separately and sequentially, and different positions of the inner wall of the oil tank are flushed step by step. While flushing, the oil return motor pump unit (11) draws the cleaning oil from the remaining sensor joints of the auxiliary oil tank back to the oil tank through the oil return pipe; An oil online detector (13) is provided on the oil return pipe to detect the quality level of the cleaning oil in real time, thereby indirectly detecting the flushing effect. In addition, an oil return filter (14) on the oil return pipe purifies the cleaning oil to increase the oil reuse rate. In order to control the oil balance inside the auxiliary oil tank during pressure supply cycle flushing, the flow meter (9) monitors the instantaneous filling flow rate, total filling flow rate, instantaneous flow rate when the oil tank is pumped out, and total pumping flow rate of the system in real time. The control system collects various flow values ​​for calculation and periodically controls the output of the pump group to achieve a stable circulation of the system. Under the above high-pressure flushing conditions, the auxiliary oil tank pressurization interface should be opened to keep the auxiliary oil tank connected to the atmosphere to prevent the abnormal air pressure inside the auxiliary oil tank from causing damage to the oil tank. FYX-800B auxiliary oil tank oil high pressure flushing method: The flushing principle is the same as that of the K / UZC 1700 auxiliary tank. The oil is injected from the sensor joints at both ends of the auxiliary tank in sequence and separately, and different positions of the inner wall of the tank are flushed. The recovery of the oil after cleaning is the same as that of the K / UZC 1700 auxiliary tank. The oil is extracted from the non-oiled sensor joints. When flushing, open the auxiliary tank booster interface to keep the auxiliary tank connected to the atmosphere to prevent damage to the tank caused by abnormal air pressure inside the auxiliary tank. The flow meter monitors the system flow in real time and periodically controls the output of the pump group to ensure stable circulation of the system. Specific method of oil self-cleaning: The system oil circuit is switched to a self-circulating branch circuit through an electric three-way ball valve (10), and the oil supply motor pump group (3) is used to drive the oil in the oil tank to circulate. During the circulation process, the cleaning oil in the oil tank is filtered through the oil filter in the pipeline to achieve the purpose of oil purification and self-cleaning.

2. The method for flushing an aircraft auxiliary fuel tank using the aircraft auxiliary fuel tank high-pressure flushing system according to claim 1 is characterized in that: An electric proportional overflow valve (4) is installed on the pipeline between the outlet of the oil supply motor pump group (3) and the oil filter group (5).

3. The method for flushing an aircraft auxiliary fuel tank using the aircraft auxiliary fuel tank high-pressure flushing system according to claim 1 is characterized in that: The oil suction filter (2), the oil filter group (5) and the oil return filter (14) are all pressure differential alarm oil filters with large flow specifications.

4. The method for flushing an aircraft auxiliary fuel tank using the aircraft auxiliary fuel tank high-pressure flushing system according to claim 1 is characterized in that: The oil online detector (13) is used to detect the quality level of the oil self-circulation of the system and the oil recovered in the auxiliary oil tank, and is equipped with a printer to print a detection report in real time.

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