Inflatable cleaning system suitable for aircraft fuel tank

Abstract

The inflatable cleaning system suitable for the aircraft fuel tank comprises a fuel circulation assembly and an inflation assembly connected to the fuel circulation assembly, the fuel circulation assembly is connected with the aircraft fuel tank, and the inflation assembly comprises a compressed gas source, a filter, a control valve set and a first bidirectional switch which are sequentially connected. The first two-way switch is connected to the fuel oil circulation assembly through a pipeline, inert compressed gas conveyed by the compressed gas source and fuel oil conveyed by the fuel oil circulation assembly enter the fuel oil tank together so that the fuel oil tank can be cleaned, and the cleaned fuel oil flows back into the fuel oil circulation assembly. The cleaning device has the advantages of being compact in structure, convenient to operate, high in cleaning efficiency and the like, and overcomes the defects that an existing cleaning mode is complex in operation and long in consumed time.

Description

TECHNICAL FIELD

[0001] The utility model relates to aviation fuel system technical field, concretely relates to a kind of inflatable cleaning system suitable for aircraft fuel tank. BACKGROUND

[0002] Aviation system has very high requirement to fuel cleanliness, and a large amount of impurities, metal chips, rubber sheet and the like are generated in the process of manufacturing and assembling fuel system, in order to meet the requirement of fuel cleanliness, it is necessary to clean the newly assembled system. The technical scheme of the existing fuel system cleaning is to replace the original system cover plate with a manufacturing process cover plate, and then clean by oil injection. The upper and lower cover plates of the original system are disassembled, a new process cover plate with a cleaning interface is manufactured and installed on the system. The oil is extracted from the lower part of the system after oil injection, and the system is cleaned by repeated oil injection and oil extraction. The process cover plate is removed, and the impurities deposited on the bottom plate are cleaned.

[0003] The existing cleaning method has the following disadvantages:

[0004] (1) Each system cover plate is not a standard part, and a large number of process cover plates need to be manufactured.

[0005] (2) The cover plate needs to be vulcanized again when disassembled and reinstalled, which takes a long time and has a complex process.

[0006] (3) The system tank cover plate needs to be disassembled and assembled, which is easy to cause foreign matter to enter the system. INVENTION CONTENTS

[0007] The utility model solves the technical problem of the existing fuel system cleaning method, which is time-consuming and has a complex process. A compact, convenient and efficient inflatable cleaning system suitable for aircraft fuel tank is provided.

[0008] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0009] An inflatable cleaning system suitable for aircraft fuel tank, comprising a fuel circulation assembly and an inflatable assembly connected to the fuel circulation assembly, the fuel circulation assembly is connected to the aircraft fuel tank, the inflatable assembly comprises a compressed gas source, a filter, a control valve group and a first bidirectional switch connected in sequence, the first bidirectional switch is connected to the fuel circulation assembly through a pipeline, the inert compressed gas delivered by the compressed gas source and the fuel delivered by the fuel circulation assembly enter the fuel tank together to realize the cleaning of the fuel tank, and the cleaned fuel flows back to the fuel circulation assembly.

[0010] As a further improvement of this utility model, the fuel circulation assembly includes an inlet quick-release self-sealing connector, a second bidirectional switch, a first four-way connector, a first quick-release connector, a first connector with a switch, a third bidirectional switch, and a return quick-release self-sealing connector. The inlet quick-release self-sealing connector, the second bidirectional switch, the first four-way connector, the first quick-release connector, and the first connector with a switch are connected sequentially. The inlet quick-release self-sealing connector is connected to the fuel vehicle, the first connector with a switch is connected to the fuel tank, and the first four-way connector is also connected to the first bidirectional switch to allow inert compressed gas and fuel to enter the fuel tank together for cleaning. The first four-way connector is also connected to the third bidirectional switch, and the third bidirectional switch is connected to the return quick-release self-sealing connector. The return quick-release self-sealing connector is connected to the fuel refueling vehicle to allow the cleaned fuel to flow back into the fuel refueling vehicle.

[0011] As a further improvement of this utility model, the fuel circulation assembly further includes a No. 2 connector with a switch, a No. 2 quick-release connector, and a No. 2 four-way connector connected in sequence. The No. 2 connector with a switch is connected to the fuel tank, and the No. 2 four-way connector is also connected to a No. 2 two-way switch and a No. 1 two-way switch respectively, so as to enable inert compressed gas and fuel to enter the fuel tank together for cleaning. The No. 2 four-way connector is also connected to a No. 3 two-way switch, so as to enable the cleaned fuel to flow back to the fuel refueling vehicle.

[0012] As a further improvement of this utility model, the control valve assembly includes a one-way valve, which is disposed between the filter and the first bidirectional switch to prevent backflow of fuel and inert compressed gas.

[0013] As a further improvement of this utility model, the control valve group also includes a control switch, which is located between the one-way valve and the first bidirectional switch, for controlling the on / off connection between the compressed gas source and the first bidirectional switch.

[0014] As a further improvement of this utility model, the control valve group also includes a pressure reducing valve, which is located between the control switch and the first bidirectional switch, for adjusting the pressure of the inert compressed gas entering the fuel tank.

[0015] As a further improvement of this utility model, the inlet end of the pressure reducing valve is provided with an inlet pressure gauge to detect the pressure of the inert compressed gas entering the pressure reducing valve.

[0016] As a further improvement of this utility model, the outlet end of the pressure reducing valve is provided with a test pressure gauge to detect the pressure of the inert compressed gas entering the fuel tank.

[0017] As a further improvement of this utility model, the control switch is a manual switch.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This utility model discloses an air-filled cleaning system for aircraft fuel tanks. By connecting the air-filled component to the fuel circulation component, the inert compressed gas supplied by the compressed gas source in the air-filled component and the fuel supplied by the fuel circulation component enter the fuel tank together. By filling in the inert compressed gas, the liquid is rapidly tumbled to clean the fuel tank, which improves the cleaning quality, shortens the cleaning time, solves the problem of needing to re-vulcanize the fuel tank cover when it is disassembled and reinstalled, and also solves the problem of foreign matter easily entering the fuel system when the fuel tank cover is disassembled and reinstalled, thus reducing secondary pollution. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure and principle of the air-filled cleaning system in a specific embodiment of this utility model.

[0021] Legend: 1. Compressed gas source; 2. Filter; 3. Check valve; 4. Control switch; 5. Pressure reducing valve; 6. Inlet pressure gauge; 7. Test pressure gauge; 8. No. 1 two-way switch; 9. Oil inlet quick-release self-sealing connector; 10. No. 2 two-way switch; 11. No. 1 four-way connector; 12. No. 1 quick-release connector; 13. No. 1 connector with switch; 14. No. 2 connector with switch; 15. No. 2 quick-release connector; 16. No. 2 four-way connector; 17. No. 3 two-way switch; 18. Oil return quick-release self-sealing connector. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0023] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Example

[0026] like Figure 1 As shown, the present invention provides an air-filling cleaning system for aircraft fuel tanks, comprising a fuel circulation assembly and an air-filling assembly connected to the fuel circulation assembly. The fuel circulation assembly is connected to the aircraft fuel tank. The air-filling assembly includes a compressed gas source 1, a filter 2, a control valve assembly, and a first bidirectional switch 8 connected in sequence. The first bidirectional switch 8 is connected to the fuel circulation assembly via a pipeline. The inert compressed gas supplied by the compressed gas source 1 and the fuel supplied by the fuel circulation assembly enter the fuel tank together to achieve fuel tank cleaning. The cleaned fuel flows back into the fuel circulation assembly. Specifically, nitrogen is used as the inert gas in this embodiment.

[0027] In this embodiment, nitrogen gas at a certain pressure is introduced into the fuel tank. Upon entering the tank, the nitrogen forms numerous bubbles. These bubbles, carried by the fuel flow, impact the tank surface, removing surface contaminants and cleaning the tank. When the bubbles burst, they release enormous energy, generating explosive jets and shock waves that further clean the tank surface. Simultaneously, air pressure forces the fuel to tumble rapidly within each tank, repeatedly rinsing the tank walls and bottom. The system then circulates the fuel, expelling the cleaned fuel and refilling it with clean fuel. This cycle repeats rapidly, ensuring the fuel system quickly reaches the required cleanliness level. This embodiment eliminates the need for numerous process covers and the removal of aircraft fuel system covers for cleaning, reducing secondary contamination and shortening cleaning time.

[0028] like Figure 1As shown, the fuel circulation assembly includes an inlet quick-release self-sealing connector 9, a second bidirectional switch 10, a first four-way connector 11, a first quick-release connector 12, a first connector with a switch 13, a third bidirectional switch 17, and a return quick-release self-sealing connector 18. The inlet quick-release self-sealing connector 9, the second bidirectional switch 10, the first four-way connector 11, the first quick-release connector 12, and the first connector with a switch 13 are connected sequentially. The inlet quick-release self-sealing connector 9 is connected to the fuel vehicle, and the first connector with a switch 13 is connected to the fuel tank. The first four-way connector 11 is also connected to the first bidirectional switch 8 to allow inert compressed gas and fuel to enter the fuel tank together for cleaning. The first four-way connector 11 is also connected to the third bidirectional switch 17, which is connected to the return quick-release self-sealing connector 18. The return quick-release self-sealing connector 18 is connected to the fuel refueling vehicle to allow the cleaned fuel to flow back into the fuel refueling vehicle.

[0029] like Figure 1 As shown, the fuel circulation assembly also includes a No. 2 switch-equipped connector 14, a No. 2 quick-release connector 15, and a No. 2 four-way connector 16 connected in sequence. The No. 2 switch-equipped connector 14 is connected to the fuel tank. The No. 2 four-way connector 16 is also connected to the No. 2 bidirectional switch 10 and the No. 1 bidirectional switch 8, respectively, so that inert compressed gas and fuel can enter the fuel tank together for cleaning. The No. 2 four-way connector 16 is also connected to the No. 3 bidirectional switch 17, so that the cleaned fuel can flow back to the fuel refueling vehicle.

[0030] In this embodiment, the functions of quick-release connector 12 and quick-release connector 15 are to facilitate the connection and disconnection of the fuel circulation assembly from the fuel tank, while the functions of connector 13 with a switch and connector 14 with a switch are to prevent fuel leakage during equipment disassembly. It can be understood that connector 11, quick-release connector 12, and connector 13 with a switch form one circulating cleaning path, and connector 16, quick-release connector 15, and connector 14 with a switch form another circulating cleaning path. The two cleaning paths can operate simultaneously or independently.

[0031] like Figure 1 As shown, the control valve assembly includes a check valve 3. The check valve 3 is located between the filter 2 and the first bidirectional switch 8 to prevent nitrogen and fuel from flowing back to the nitrogen source when the nitrogen source pressure is insufficient.

[0032] The control valve assembly also includes a control switch 4. Control switch 4 is located between the one-way valve 3 and the first two-way switch 8 to control the on / off connection between the compressed gas source 1 and the first two-way switch 8. Furthermore, control switch 4 is a manual switch; the flow rate of compressed gas entering the fuel tank is controlled by manually adjusting the opening of control switch 4.

[0033] The control valve assembly also includes a pressure reducing valve 5. The pressure reducing valve 5 is located between the control switch 4 and the first two-way switch 8, and is used to regulate the pressure of the inert compressed gas entering the fuel tank.

[0034] Furthermore, the inlet end of the pressure reducing valve 5 is equipped with an intake pressure gauge 6 to detect the pressure of the inert compressed gas entering the pressure reducing valve 5. The outlet end of the pressure reducing valve 5 is equipped with a test pressure gauge 7 to detect the pressure of the inert compressed gas entering the fuel tank after pressure reduction. It is understood that, to improve the safety of fuel tank cleaning, the test pressure gauge 7 can also be connected to an alarm device. When the value of the test pressure gauge 7 exceeds a preset range, the alarm device will sound an alarm to remind the operator to inspect and maintain the pressure reducing valve 5.

[0035] The working principle of the air-filled cleaning system in this embodiment is as follows:

[0036] The pressurized fuel from the fuel-powered vehicle flows through the inlet quick-release self-sealing connector 9 to the second bidirectional switch 10. The second bidirectional switch 10 controls the fuel flow to the first four-way connector 11 and the second four-way connector 16, then through the first quick-release connector 12 and the second quick-release connector 15 to the first switch-equipped connector 13 and the second switch-equipped connector 14, respectively, and finally into the fuel tank. The cleaned fuel, under the pressure of the fuel supply, flows to the first switch-equipped connector 13 and the second switch-equipped connector 14, then through the first quick-release connector 12 and the second quick-release connector 15 to the first four-way connector 11 and the second four-way connector 16, respectively. Finally, the third bidirectional switch 17 controls the fuel flow to the return quick-release self-sealing connector 18, reaching the fuel refueling truck.

[0037] Nitrogen gas at a certain pressure output from compressed gas source 1 is filtered through filter 2 to remove impurities. It then passes through check valve 3 and control switch 4 into pressure reducing valve 5. After pressure reduction by valve 5, the nitrogen pressure is lowered to a level that the fuel tank can withstand (0.2–0.3 MPa). The reduced-pressure nitrogen gas is then controlled by bidirectional switch 8 to go to four-way connector 11 and four-way connector 16 respectively to mix with fuel. It then passes through quick-release connectors 12 and 15 to connectors 13 and 14 respectively, and finally enters the fuel tank. Upon entering the fuel tank, the nitrogen gas forms numerous bubbles. These bubbles, carried by the fuel flow, impact the surface of the fuel tank, removing any adhering substances. When the bubbles burst, they release enormous energy, generating explosive jets and shock waves that clean the surface of the fuel tank. Simultaneously, the air pressure causes the fuel to tumble rapidly within each fuel tank, repeatedly rinsing the tank walls and bottom. As the nitrogen pressure decreases within the fuel tank, it is discharged outside.

[0038] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An inflatable cleaning system suitable for use in an aircraft fuel tank, characterized in that, The application relates to a fuel tank cleaning device, which comprises a fuel circulation assembly and an inflation assembly connected to the fuel circulation assembly, the fuel circulation assembly is connected to an airplane fuel tank, the inflation assembly comprises a compressed gas source (1), a filter (2), a control valve group and a first bidirectional switch (8) connected in sequence, the first bidirectional switch (8) is connected to the fuel circulation assembly through a pipeline, and inert compressed gas delivered by the compressed gas source (1) and fuel delivered by the fuel circulation assembly enter the fuel tank together to realize fuel tank cleaning, and the cleaned fuel returns to the fuel circulation assembly.

2. The inflatable cleaning system suitable for use in an aircraft fuel tank according to claim 1, wherein, The fuel circulation assembly comprises an oil inlet quick-release self-sealing joint (9), a second bidirectional switch (10), a first four-way joint (11), a first quick-release joint (12), a first switch joint (13), a third bidirectional switch (17) and an oil return quick-release self-sealing joint (18); the oil inlet quick-release self-sealing joint (9), the second bidirectional switch (10), the first four-way joint (11), the first quick-release joint (12) and the first switch joint (13) are connected in sequence, the oil inlet quick-release self-sealing joint (9) is connected to a fuel truck, the first switch joint (13) is connected to the fuel tank, the first four-way joint (11) is further connected to the first bidirectional switch (8) to realize that inert compressed gas and fuel enter the fuel tank together to clean, the first four-way joint (11) is further connected to the third bidirectional switch (17), the third bidirectional switch (17) is connected to the oil return quick-release self-sealing joint (18), and the oil return quick-release self-sealing joint (18) is connected to the fuel truck to realize that the cleaned fuel returns to the fuel truck.

3. The inflatable cleaning system suitable for use in an aircraft fuel tank according to claim 2, wherein, The fuel circulation assembly further comprises a second switch joint (14), a second quick-release joint (15) and a second four-way joint (16) connected in sequence, the second switch joint (14) is connected to the fuel tank, the second four-way joint (16) is further connected to the second bidirectional switch (10) and the first bidirectional switch (8) respectively to realize that inert compressed gas and fuel enter the fuel tank together to clean, and the second four-way joint (16) is further connected to the third bidirectional switch (17) to realize that the cleaned fuel returns to the fuel truck.

4. The inflatable cleaning system suitable for use in an aircraft fuel tank according to claim 3, wherein, The control valve group comprises a one-way valve (3) arranged between the filter (2) and the first bidirectional switch (8) to prevent the return of fuel and inert compressed gas.

5. The inflatable cleaning system suitable for use in an aircraft fuel tank according to claim 4, wherein, The control valve group further comprises a control switch (4) arranged between the one-way valve (3) and the first bidirectional switch (8) to control the on-off between the compressed gas source (1) and the first bidirectional switch (8).

6. The inflatable cleaning system suitable for use in an aircraft fuel tank according to claim 5, wherein, The control valve group further comprises a pressure reducing valve (5) arranged between the control switch (4) and the first bidirectional switch (8) to adjust the inert compressed gas pressure entering the fuel tank.

7. The inflatable cleaning system suitable for use in an aircraft fuel tank according to claim 6, wherein, An air inlet pressure gauge (6) is arranged at the inlet end of the pressure reducing valve (5) to detect the inert compressed gas pressure entering the pressure reducing valve (5).

8. The inflatable cleaning system suitable for use in an aircraft fuel tank according to claim 7, wherein, An experimental pressure gauge (7) is arranged at the outlet end of the pressure reducing valve (5) to detect the inert compressed gas pressure entering the fuel tank.

9. A gas-powered cleaning system for an aircraft fuel tank according to any one of claims 5 to 8, characterised in that, The control switch (4) is a manual switch. The control switch (4) is a manual switch.

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