Pressurized oil transportation inspection system and method

Abstract

The invention provides a pressurized oil transportation inspection system and method.The pressurized oil transportation inspection system comprises an air path system used for supplying air, the air path system adopts an air booster pump as a power source, then air is compressed into air sources of different pressure grades, filling pressurization of an auxiliary oil tank is achieved, and the pressurized oil transportation inspection system is used for pressure filling of wheel type equipment / rescue air bags; and the hydraulic pumping and discharging system adopts an explosion-proof motor pump set as a power source for pumping and discharging fuel oil of the auxiliary oil tank, and then the hydraulic pumping and discharging system is used for rapidly pumping and discharging oil in the auxiliary oil tank through an oil discharging pipe and a gravity refueling connector. According to the system, rapid pressurization of the auxiliary fuel tank can be achieved under the condition that an aircraft engine is not started, meanwhile, fuel oil in the pressurization fuel tank can be continuously extracted, and rapid troubleshooting and overhauling of the auxiliary fuel tank are facilitated; meanwhile, the pressurization oil transportation inspection system can output an adjustable air source to the outside, and equipment such as tires and rescue air bags can be inflated.

Description

Technical Field

[0001] The invention belongs to the field of aviation support equipment, and in particular relates to a pressurized oil delivery inspection system and method. Background Art

[0002] When a certain type of aircraft is on station or in field maneuvering operations, it is necessary to provide the aircraft's 800L and 1700L auxiliary fuel tanks with the required air pressure and flow to achieve rapid pressurization of the auxiliary fuel tanks without starting the aircraft engine. At the same time, it is also necessary to continuously extract the fuel in the pressurized tanks to facilitate rapid troubleshooting and maintenance of the auxiliary fuel tanks. In order to meet the above functional requirements, a corresponding system needs to be designed. Summary of the invention

[0003] The purpose of the present invention is to provide a pressurized oil transfer inspection system and method, which can realize rapid pressurization of the auxiliary fuel tank without starting the aircraft engine, and can continuously extract the fuel in the pressurized fuel tank, so as to facilitate the rapid troubleshooting and maintenance of the auxiliary fuel tank; at the same time, the pressurized oil transfer inspection system can output an adjustable air source to the outside, so as to inflate equipment such as tires and rescue airbags.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: a pressurized oil delivery inspection system includes an air circuit system for air supply, wherein the air circuit system uses an air booster pump as a power source, and further compresses the air into air sources of different pressure levels, realizes the filling and pressurization of the auxiliary oil tank, and is used for pressure filling of wheeled equipment / rescue airbags; The invention also includes a hydraulic pumping system, which uses an explosion-proof motor pump group as a power source for pumping fuel from the auxiliary fuel tank, and is further used to realize rapid pumping of the oil in the auxiliary fuel tank through the oil drain pipe and the gravity refueling interface.

[0005] The air circuit system includes an air booster pump, the outlet of the air booster pump is connected to a first one-way valve, the pipeline after the first one-way valve is sequentially connected to a system output switch, an air filter, a pressure reducing valve and a pressure reducing air source switch, and the other end of the pressure reducing air source switch is connected to a pressure reducing air source output port; An air source pressure switch is connected between the air filter and the pressure reducing valve, and the other end of the air source pressure switch is connected to the air source pressure output port.

[0006] A buffer gas cylinder is connected between the first one-way valve and the system output switch; A first in-situ metering interface, a first gas source pressure gauge and a first pressure sensor are also connected between the first one-way valve and the system output switch.

[0007] It also includes a factory gas source interface and a standard gas source interface, and the factory gas source interface and the standard gas source interface are respectively connected to the system output switch through a one-way valve.

[0008] A first safety valve is connected between the pressure reducing valve and the pressure reducing gas source switch; A second in-situ metering interface, a second gas source pressure gauge and a second pressure sensor are also connected between the pressure reducing valve and the pressure reducing gas source switch.

[0009] The hydraulic pumping system includes an explosion-proof motor pump group, the inlet of which is connected to the soft oil bag through a second one-way valve, a first quick-release joint, a second quick-release joint, and an oil delivery hose; The outlet of the explosion-proof motor pump unit is connected to the auxiliary oil tank through the third quick-release connector.

[0010] A second safety valve is connected in parallel to the explosion-proof motor pump group; A third in-situ metering interface and a third pressure sensor are connected between the second one-way valve and the first quick-release connector.

[0011] An operating method of a pressurized oil delivery inspection system, wherein the operating method is implemented by the pressurized oil delivery inspection system, and comprises: Auxiliary fuel tank boost control, used to boost the auxiliary fuel tank through the gas system; Wheeled equipment / rescue airbag inflation control, used to inflate wheeled equipment / rescue airbags through the air circuit system; The auxiliary tank fuel extraction control realizes direct extraction of the fuel in the auxiliary tank through the hydraulic extraction system or indirect extraction of the fuel in the auxiliary tank through the coordinated operation of the hydraulic extraction system and the air circuit system.

[0012] The specific process of pressurizing the auxiliary fuel tank is as follows: First, the pressure-reducing gas source output port of the gas circuit system is connected to the aircraft gas circuit distribution system, and the aircraft gas circuit distribution system is connected to the aircraft's pressurization pipe joint; Then, the air booster pump is started, and the compressed gas generated by the air booster pump passes through the first one-way valve, the system output switch, the air filter, the pressure reducing valve and the pressure reducing air source switch in sequence into the aircraft air distribution system, and then the aircraft air distribution system distributes the compressed air to the auxiliary fuel tank for secondary distribution to pressurize the auxiliary fuel tank; The specific process of charging the wheeled equipment / rescue airbag is as follows: First, connect the decompression gas source outlet of the gas circuit system to the air inlet of the wheeled equipment and the rescue airbag equipment at the same time; Then, start the air booster pump, and the compressed gas generated by the air booster pump passes through the first one-way valve, system output switch, air filter, pressure reducing valve and pressure reducing gas source switch in sequence into the wheeled equipment and rescue airbag equipment, thereby meeting the emergency pressurization of different equipment.

[0013] The specific process of the auxiliary tank fuel extraction control is as follows: When direct extraction is used: This method is to connect the gravity refueling port of the auxiliary fuel tank to pump out the fuel. This pumping mode requires opening the gravity refueling port cover and extending the oil suction hose to the bottom of the auxiliary fuel tank through the adapter assembly to pump out the oil. At this time, the auxiliary fuel tank pressurization condition is not met, and the pumping efficiency is moderate; In the specific pumping process, the third quick-release joint of the hydraulic pumping system is connected to the gravity refueling port of the auxiliary fuel tank through the oil suction hose and extended to the bottom of the auxiliary fuel tank. Then, the explosion-proof motor pump group is started to suck the fuel inside the auxiliary fuel tank into the soft oil bag through the explosion-proof motor pump group. When using indirect extraction: First, the auxiliary fuel tank is pressurized with compressed air. When the pressurized air pressure in the auxiliary fuel tank reaches the pressure for delivering fuel to the onboard fuel supply and oil transfer system, the oil in the auxiliary fuel tank is transported to the onboard fuel supply and oil transfer system through the internal oil transfer pipeline. At this time, it is connected to the hydraulic pumping system through the quick-release joint of the aircraft refueling interface, and then the fuel in the auxiliary fuel tank is sucked out, so as to achieve the purpose of pressurizing and draining the auxiliary fuel tank. This pumping mode is carried out under the condition of pressurizing the auxiliary fuel tank, and the oil pumping efficiency is relatively high.

[0014] The present invention has the following beneficial effects: 1. The system of the present invention meets the requirements of fuel extraction from 800L and 1700L auxiliary fuel tanks of a certain type of aircraft. The extraction method can be through the oil drain pipe and the gravity refueling port of the auxiliary fuel tank.

[0015] 2. The system of the present invention is equipped with an air boosting system, which can fill the auxiliary fuel tank with compressed air that meets the pressure requirements to achieve rapid pressurization.

[0016] 3. The system of the present invention is equipped with an air boost branch system, which can realize continuous and adjustable air source output to pressurize tires of wheeled equipment, rescue airbags and other equipment.

[0017] 4. The system of the present invention has a dual power supply driving function and can simultaneously meet the AC220V / 50Hz AC power supply and DC28V DC power supply input.

[0018] 5. The system of the present invention has a power inverter function and can output AC220V / 50Hz AC power voltage to the outside by connecting to a ground power supply vehicle.

[0019] 6. The system of the present invention has the functions of digital display of operating pressure and overpressure alarm protection of system operating mode.

[0020] 7. The system of the present invention has the in-situ measurement function of the pressure gauge and sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a gas path system diagram of the present invention.

[0023] Figure 2 This is a diagram of the hydraulic pumping system of the present invention.

[0024] Figure 3 This is a diagram of the auxiliary fuel tank pressurization process of the present invention.

[0025] Figure 4 This is a diagram of the pressurization process of the wheeled equipment / rescue airbag, etc. of the present invention.

[0026] Figure 5 This is a diagram of the fuel extraction process of the gravity refueling port of the auxiliary fuel tank of the present invention.

[0027] Figure 6 This is a diagram of the pressurized fuel extraction process of the auxiliary fuel tank of the present invention.

[0028] In the figure: air booster pump 1, first one-way valve 2, first in-situ metering interface 3, first air source pressure gauge 4, first pressure sensor 5, buffer gas cylinder 6, system output switch 7, air filter 8, pressure reducing valve 9, second air source pressure gauge 10, second pressure sensor 11, air source supply pressure switch 12, pressure reducing air source switch 13, first safety valve 14, standard air source interface 15, factory air source interface 16, air source pressure output port 17, pressure reducing air source output port 18, third quick release connector Head 19, explosion-proof motor pump group 20, second safety valve 21, second one-way valve 22, third pressure sensor 23, third in-situ metering interface 24, first quick-release connector 25, second quick-release connector 26, oil hose 27, soft oil bag 28, aircraft air distribution system 29, aircraft 30, booster pipe joint 31, rescue airbag equipment 32, wheeled equipment 33, aircraft refueling interface 34, oil pipe joint 35, on-board oil supply and oil transfer system 36, gravity refueling port 37. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0030] Embodiment 1: See also Figure 1-6 The pressurized oil delivery inspection system includes an air circuit system for air supply, which uses an air booster pump 1 as a power source to compress the air into air sources of different pressure levels to achieve filling and pressurizing of the auxiliary fuel tank, and is used for pressure filling of wheeled equipment / rescue airbags; it also includes a hydraulic pumping system, which uses an explosion-proof motor pump group 20 as a power source for pumping fuel from the auxiliary fuel tank, and is used to quickly pump out the oil in the auxiliary fuel tank through the oil drain pipe and the gravity refueling interface. This system can achieve rapid pressurization of the auxiliary fuel tank without starting the aircraft engine, and can continuously extract the fuel in the pressurized fuel tank, which is convenient for rapid troubleshooting and maintenance of the auxiliary fuel tank; at the same time, the pressurized oil delivery inspection system can output an adjustable air source to the outside, which can inflate equipment such as tires and rescue airbags.

[0031] See also Figure 1 Furthermore, the air circuit system includes an air booster pump 1, the outlet of the air booster pump 1 is connected to the first one-way valve 2, the pipeline after the first one-way valve 2 is connected in sequence to the system output switch 7, the air filter 8, the pressure reducing valve 9 and the pressure reducing air source switch 13, the other end of the pressure reducing air source switch 13 is connected to the pressure reducing air source output port 18; an air source supply pressure switch 12 is connected between the air filter 8 and the pressure reducing valve 9, and the other end of the air source supply pressure switch 12 is connected to the air source pressure output port 17. The above-mentioned air circuit system can be used to supply air to the auxiliary fuel tank. The air booster pump 1 is used to compress and boost the air of standard pressure to the system required pressure, and the maximum compression output pressure is 30MPa.

[0032] Furthermore, a buffer gas cylinder 6 is connected between the first one-way valve 2 and the system output switch 7; Furthermore, a first in-situ metering interface 3 , a first gas source pressure gauge 4 and a first pressure sensor 5 are connected between the first one-way valve 2 and the system output switch 7 .

[0033] Furthermore, it also includes a factory gas source interface 16 and a standard gas source interface 15, and the factory gas source interface 16 and the standard gas source interface 15 are respectively connected to the system output switch 7 through a one-way valve.

[0034] Furthermore, a first safety valve 14 is connected between the pressure reducing valve 9 and the pressure reducing gas source switch 13; Furthermore, a second in-situ metering interface, a second gas source pressure gauge 10 and a second pressure sensor 11 are connected between the pressure reducing valve 9 and the pressure reducing gas source switch 13 .

[0035] The first gas source pressure gauge 4 and the second gas source pressure gauge 10 are respectively used to display the standard nitrogen or compressed air input into the system when the system is in a power-off condition, so as to realize the power-off emergency operation of the equipment.

[0036] The first pressure sensor 5 and the second pressure sensor 11 are used to monitor the system operating pressure and provide input parameters for system early warning.

[0037] The buffer gas cylinder 6 is used to buffer the output gas pressure of the booster pump and the pre-stored gas source, so as to realize the stable output of the gas source and the pressure-reduced output in a small range.

[0038] The system output switch 7, the pressure reducing gas source switch 13 and the gas source pressure supply switch 12 are used to control the on-off of the gas circuits of the corresponding branches of the system.

[0039] The pressure reducing valve 9 is used to reduce the pressure of the compressed gas source and output a continuously adjustable low-pressure gas source, 0-0.3MPa, adjustable.

[0040] The first safety valve 14 is used to limit the maximum pressure of the pressure reducing branch circuit, so that the mechanical protection system can operate safely.

[0041] Embodiment 2: See also Figure 2 The hydraulic pumping system includes an explosion-proof motor pump group 20, the inlet of which is connected to the soft oil bag 28 through a second one-way valve 22, a first quick-release joint 25, a second quick-release joint 26, and an oil delivery hose 27; the outlet of the explosion-proof motor pump group 20 is connected to the auxiliary oil tank through a third quick-release joint 19. The hydraulic pumping system uses an explosion-proof motor pump group as a power source for pumping fuel from the auxiliary oil tank, and can quickly pump out the oil in the auxiliary oil tank through the oil drain pipe and the gravity refueling interface.

[0042] Furthermore, a second safety valve 21 is connected in parallel to the explosion-proof motor pump group 20; Furthermore, a third in-situ metering interface 24 and a third pressure sensor 23 are connected between the second one-way valve 22 and the first quick-release connector 25 .

[0043] Among them, the quick-release connector adopts a snap-on quick-release structure, which can quickly and tightly connect the oil delivery hose.

[0044] The explosion-proof motor pump group 20 uses a vane pump as the fuel pumping power source, which has strong self-priming force and high oil pumping efficiency, and the oil pumping head can reach 5 meters underground relative to the pump port.

[0045] The second safety valve 21 is used to limit the maximum pressure of the oil delivery head at the oil pump outlet, which is initially set to 0.3 MPa.

[0046] The third pressure sensor 23 is used to monitor the system oil delivery pressure, and when it exceeds the maximum value, it will immediately shut down and alarm.

[0047] The third in-situ metering interface 24 is used for in-situ metering of the pressure sensor.

[0048] Embodiment 3: An operating method of a pressurized oil delivery inspection system, wherein the operating method is implemented by the pressurized oil delivery inspection system, and comprises: Auxiliary fuel tank boost control, used to boost the auxiliary fuel tank through the gas system; Wheeled equipment / rescue airbag inflation control, used to inflate wheeled equipment / rescue airbags through the air circuit system; The auxiliary tank fuel extraction control realizes direct extraction of the fuel in the auxiliary tank through the hydraulic extraction system or indirect extraction of the fuel in the auxiliary tank through the coordinated operation of the hydraulic extraction system and the air circuit system.

[0049] Embodiment 4: See also Figure 3 The specific process of pressurizing the auxiliary fuel tank is as follows: First, the decompression gas source output port 18 of the gas circuit system is connected to the aircraft gas circuit distribution system 29, and the aircraft gas circuit distribution system 29 is connected to the boost pipe joint 31 of the aircraft 30; Then, the air booster pump 1 is started, and the compressed gas generated by the air booster pump 1 enters the aircraft air path distribution system 29 through the first one-way valve 2, the system output switch 7, the air filter 8, the pressure reducing valve 9 and the pressure reducing air source switch 13 in sequence, and then the aircraft air path distribution system 29 distributes the compressed air to the auxiliary fuel tank for secondary distribution, so as to pressurize the auxiliary fuel tank; Embodiment 5: See also Figure 4 The specific process of pressurizing the wheeled equipment / rescue airbag is as follows: First, the decompression gas source output port 18 of the gas circuit system is connected to the air inlet ports of the wheeled equipment 33 and the rescue airbag equipment 32 at the same time; Then, start the air booster pump 1, and the compressed gas generated by the air booster pump 1 enters the wheeled equipment 33 and the rescue airbag equipment 32 through the first one-way valve 2, the system output switch 7, the air filter 8, the pressure reducing valve 9 and the pressure reducing gas source switch 13 in sequence, thereby meeting the emergency pressurization of different equipment.

[0050] Embodiment 6: See also Figure 5 The specific process of the auxiliary tank fuel extraction control is as follows: When direct extraction is used: This method is to connect the gravity refueling port 37 of the auxiliary fuel tank to pump out the fuel. This pumping mode requires opening the gravity refueling port cover and extending the oil suction hose to the bottom of the auxiliary fuel tank through the adapter assembly to pump out the fuel. At this time, the auxiliary fuel tank pressurization condition is not met, and the pumping efficiency is moderate; In the specific pumping process, the third quick-release connector 19 of the hydraulic pumping system is connected to the gravity refueling port 37 of the auxiliary tank through the oil suction hose and extended to the bottom of the auxiliary tank, and then the explosion-proof motor pump group 20 is started to suck the fuel inside the auxiliary tank into the soft oil bag 28 through the explosion-proof motor pump group 20; Embodiment 7: See also Figure 6 , when indirect extraction is used: First, the auxiliary fuel tank is pressurized with compressed air. When the pressurized air pressure in the auxiliary fuel tank reaches the pressure for delivering fuel to the on-board fuel supply and oil transfer system 36, the oil in the auxiliary fuel tank is delivered to the on-board fuel supply and oil transfer system 36 through the internal oil transfer pipeline. At this time, it is connected to the hydraulic pumping system through the quick-release joint of the aircraft refueling interface 34, and then the fuel in the auxiliary fuel tank is sucked out, so as to achieve the purpose of pressurizing and draining the auxiliary fuel tank. This pumping mode is carried out under the condition of pressurizing the auxiliary fuel tank, and the oil pumping efficiency is relatively high.

[0051] Embodiment 8: Main technical parameters: 1) Equipment power supply: AC220V / 50Hz, DC28V; 2) Maximum oil pumping flow: 300L / min; 3) Pumping pressure: ≤0.3MPa; 4) Maximum output pressure of compressed air booster pump: 30MPa, adjustable; 5) Maximum output flow of compressed air booster pump: 140L / min; 6) Gas pressure reducing branch output pressure: (0~0.3)MPa, adjustable; 7) Continuous working time: ≥3h; 8) Cable length: ≥10m; 9) Oil pipe length: The oil extraction pipe connected to the aircraft is ≥10m, and the oil storage and transportation pipe is ≤20m.

[0052] Environmental requirements: Working conditions: temperature: 10℃~35℃; relative humidity: ≤90%; Non-working state: temperature: -40℃~55℃.

Claims

1. The boost oil delivery inspection system is characterized by: The invention comprises an air circuit system for supplying air, wherein the air circuit system uses an air booster pump (1) as a power source, thereby compressing air into air sources of different pressure levels, thereby realizing filling and pressurizing of the auxiliary fuel tank, and is used for pressure filling of wheeled equipment / rescue airbags; The invention also comprises a hydraulic pumping system, wherein the hydraulic pumping system uses an explosion-proof motor pump group (20) as a power source for pumping out fuel from the auxiliary fuel tank, thereby realizing rapid pumping out of the oil in the auxiliary fuel tank through the oil drain pipe and the gravity refueling interface.

2. The pressurized oil delivery inspection system according to claim 1, characterized in that: The gas circuit system comprises an air booster pump (1), the outlet of the air booster pump (1) is connected to a first one-way valve (2), the pipeline after the first one-way valve (2) is connected in sequence to a system output switch (7), an air filter (8), a pressure reducing valve (9) and a pressure reducing gas source switch (13), and the other end of the pressure reducing gas source switch (13) is connected to a pressure reducing gas source output port (18); An air source pressure switch (12) is connected between the air filter (8) and the pressure reducing valve (9), and the other end of the air source pressure switch (12) is connected to the air source pressure output port (17).

3. The pressurized oil delivery inspection system according to claim 2, characterized in that: A buffer gas cylinder (6) is connected between the first one-way valve (2) and the system output switch (7); A first in-situ metering interface (3), a first gas source pressure gauge (4) and a first pressure sensor (5) are also connected between the first one-way valve (2) and the system output switch (7).

4. The pressurized oil delivery inspection system according to claim 2, characterized in that: It also includes a factory gas source interface (16) and a standard gas source interface (15), and the factory gas source interface (16) and the standard gas source interface (15) are respectively connected to the system output switch (7) through a one-way valve.

5. The pressurized oil delivery inspection system according to claim 2, characterized in that: A first safety valve (14) is connected between the pressure reducing valve (9) and the pressure reducing gas source switch (13); A second in-situ metering interface, a second gas source pressure gauge (10) and a second pressure sensor (11) are also connected between the pressure reducing valve (9) and the pressure reducing gas source switch (13).

6. The pressurized oil delivery inspection system according to claim 1, characterized in that: The hydraulic pumping system comprises an explosion-proof motor pump unit (20), the inlet of which is connected to the soft oil bag (28) via a second one-way valve (22), a first quick-release joint (25), a second quick-release joint (26), and an oil delivery hose (27); The outlet of the explosion-proof motor pump unit (20) is connected to the auxiliary oil tank via a third quick-release connector (19).

7. The pressurized oil delivery inspection system according to claim 6, characterized in that: The explosion-proof motor pump unit (20) is connected in parallel with a second safety valve (21); A third in-situ metering interface (24) and a third pressure sensor (23) are connected between the second one-way valve (22) and the first quick-release connector (25).

8. The operating method of the boost oil delivery inspection system is characterized in that: The operation method is implemented by using the pressurized oil delivery inspection system according to any one of claims 1 to 7, comprising: Auxiliary fuel tank boost control, used to boost the auxiliary fuel tank through the gas system; Wheeled equipment / rescue airbag inflation control, used to inflate wheeled equipment / rescue airbags through the air circuit system; The auxiliary tank fuel extraction control realizes direct extraction of the fuel in the auxiliary tank through the hydraulic extraction system or indirect extraction of the fuel in the auxiliary tank through the coordinated operation of the hydraulic extraction system and the air circuit system.

9. The operating method of the pressurized oil delivery inspection system according to claim 8, characterized in that: The specific process of pressurizing the auxiliary fuel tank is as follows: First, the pressure-reducing gas source output port (18) of the gas circuit system is connected to the aircraft gas circuit distribution system (29), and the aircraft gas circuit distribution system (29) is connected to the pressurization pipe joint (31) of the aircraft (30); Then, the air booster pump (1) is started, and the compressed gas generated by the air booster pump (1) passes through the first one-way valve (2), the system output switch (7), the air filter (8), the pressure reducing valve (9) and the pressure reducing gas source switch (13) in sequence and enters the aircraft air path distribution system (29), and then the aircraft air path distribution system (29) distributes the compressed air to the auxiliary fuel tank for a second time, thereby pressurizing the auxiliary fuel tank; The specific process of charging the wheeled equipment / rescue airbag is as follows: First, the decompression gas source output port (18) of the gas circuit system is connected to the air inlet ports of the wheeled equipment (33) and the rescue airbag equipment (32) at the same time; Then, the air booster pump (1) is started, and the compressed gas generated by the air booster pump (1) passes through the first one-way valve (2), the system output switch (7), the air filter (8), the pressure reducing valve (9) and the pressure reducing gas source switch (13) in sequence and enters the wheeled equipment (33) and the rescue airbag equipment (32), thereby meeting the emergency charging requirements of different equipment.

10. The operating method of the pressurized oil delivery inspection system according to claim 8, characterized in that: The specific process of the auxiliary tank fuel extraction control is as follows: When direct extraction is used: This method is to connect the gravity refueling port (37) of the auxiliary fuel tank to pump out the fuel. This pumping mode requires opening the gravity refueling port cover and extending the oil suction hose through the adapter assembly to the bottom of the auxiliary fuel tank to pump out the fuel. At this time, the auxiliary fuel tank pressurization condition is not met, and the pumping efficiency is moderate. In a specific pumping process, the third quick-release connector (19) of the hydraulic pumping system is connected to the gravity refueling port (37) of the auxiliary oil tank through an oil suction hose and extended to the bottom of the auxiliary oil tank, and then the explosion-proof motor pump group (20) is started to pump the fuel in the auxiliary oil tank into the soft oil bag (28) through the explosion-proof motor pump group (20); When using indirect extraction: First, the auxiliary fuel tank is pressurized with compressed air. When the pressurized air pressure in the auxiliary fuel tank reaches the pressure for delivering fuel to the onboard fuel supply and oil transfer system (36), the oil in the auxiliary fuel tank is delivered to the onboard fuel supply and oil transfer system (36) through the internal oil transfer pipeline. At this time, the auxiliary fuel tank is connected to the hydraulic pumping system through the quick-release joint of the aircraft refueling interface (34), and the fuel in the auxiliary fuel tank is sucked out, thereby achieving the purpose of pressurizing and draining the auxiliary fuel tank. This pumping mode is carried out under the condition of pressurizing the auxiliary fuel tank, and the oil pumping efficiency is relatively high.

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