CN118753511B - A method for replacing oil and gas in aircraft fuel transmission pipeline - Google Patents
A method for replacing oil and gas in aircraft fuel transmission pipeline Download PDFInfo
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- CN118753511B CN118753511B CN202411253271.8A CN202411253271A CN118753511B CN 118753511 B CN118753511 B CN 118753511B CN 202411253271 A CN202411253271 A CN 202411253271A CN 118753511 B CN118753511 B CN 118753511B
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- assembly
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 178
- 239000000446 fuel Substances 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 107
- 238000005086 pumping Methods 0.000 claims abstract description 66
- 239000007789 gas Substances 0.000 claims abstract description 57
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000003921 oil Substances 0.000 claims description 170
- 238000012546 transfer Methods 0.000 claims description 47
- 239000000295 fuel oil Substances 0.000 claims description 42
- 238000007599 discharging Methods 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 13
- 238000011549 displacement method Methods 0.000 claims description 13
- 239000010763 heavy fuel oil Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 10
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/14—Filling or emptying
- B64D37/20—Emptying systems
- B64D37/28—Control thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F1/00—Ground or aircraft-carrier-deck installations
- B64F1/28—Liquid-handling installations specially adapted for fuelling stationary aircraft
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
本发明公开一种飞机燃油传输管路油气置换方法，涉及飞行器燃油装卸技术领域，利用气源组件向集油组件输入氮气，再利用油泵将燃油传输管路中的燃油抽至集油组件，集油组件中的氮气进入燃油传输管路，完成第一次负压抽油；此后，利用真空抽油组件将燃油传输管路中的余油抽至真空抽油组件，完成第二次负压抽油；将气体传输管路关闭，并保持液体传输管路导通；将气源组件和集油组件之间的连通关闭；将真空抽油组件停止作业；利用气源组件向燃油传输管路中充入适量氮气，氮气将燃油传输管路中的余油逼出，完成一次正压压油。本发明中飞机燃油传输管路油气置换方法具有两次负压抽油和一次正压压油，排油效率较高，能使燃油传输管路中大部分余油排出。
The invention discloses an oil-gas replacement method for an aircraft fuel transmission pipeline, and relates to the technical field of aircraft fuel loading and unloading. An air source component is used to input nitrogen into an oil collection component, and then an oil pump is used to pump the fuel in the fuel transmission pipeline to the oil collection component, and the nitrogen in the oil collection component enters the fuel transmission pipeline, completing the first negative pressure oil pumping; thereafter, a vacuum oil pumping component is used to pump the remaining oil in the fuel transmission pipeline to the vacuum oil pumping component, completing the second negative pressure oil pumping; the gas transmission pipeline is closed, and the liquid transmission pipeline is kept conductive; the connection between the air source component and the oil collection component is closed; the vacuum oil pumping component is stopped; and an appropriate amount of nitrogen is filled into the fuel transmission pipeline by the air source component, and the nitrogen forces out the remaining oil in the fuel transmission pipeline, completing a positive pressure oil pressing. The oil-gas replacement method for an aircraft fuel transmission pipeline in the invention has two negative pressure oil pumpings and one positive pressure oil pressing, and the oil discharge efficiency is high, and most of the remaining oil in the fuel transmission pipeline can be discharged.
Description
Technical Field
The invention relates to the technical field of aircraft fuel loading and unloading, in particular to an oil-gas displacement method for an aircraft fuel transmission pipeline.
Background
As the aviation industry has evolved, so too has the need to transfer fuel from one aircraft to another. The invention patent with publication number CN112455703A discloses a device and a method for stringing oil between airplanes, an oil pump is connected with two oil tank connectors through a fuel pipeline, the connectors are respectively connected with fuel tanks of two airplanes, and the oil pump is used for transmitting the fuel oil of one airplane to the other airplane.
After the oil-fuel transmission operation between the planes is finished, residual fuel in the fuel pipeline needs to be pumped away, in the prior art, the fuel in the fuel pipeline is directly pumped away to a tank type fuelling vehicle by utilizing a subsea valve and an oil pump, but due to the fact that the fuel pipeline is long, after the oil-fuel transmission operation is finished, part of fuel still stays in the fuel pipeline, if the residual oil in the pipe is not collected in time, fuel waste and breeding of bacteria in the pipe pollute the fuel pipeline, and if pollutants enter an oil tank of the plane, risks can be caused to flight safety of the plane.
At present, a fuel oil displacement method which can carry out oil gas displacement of an aircraft fuel oil transmission pipeline and effectively clean residual fuel oil of an inter-aircraft fuel oil transmission pipeline after the fuel oil displacement is finished is lacked.
Disclosure of Invention
The invention mainly aims to provide an oil-gas displacement method for an aircraft fuel transmission pipeline, which aims to solve the technical problems that the prior art lacks of being capable of carrying out oil-gas displacement of the aircraft fuel transmission pipeline and effectively cleaning residual fuel of a fuel transmission pipeline between aircraft after the fuel displacement is finished.
In order to achieve the above purpose, the invention provides an oil gas displacement method for an aircraft fuel oil transmission pipeline, which comprises the following steps:
S101, respectively connecting pressure connectors at two ends of a fuel transmission pipeline with an oil discharging aircraft and a refueling aircraft, pumping fuel in the oil discharging aircraft to the refueling aircraft by utilizing an oil pump and the fuel transmission pipeline, and disconnecting the fuel transmission pipeline from the oil discharging aircraft and the refueling aircraft;
S102, inputting nitrogen into an oil collecting assembly by utilizing an air source assembly, and pumping fuel oil in a fuel oil transmission pipeline to the oil collecting assembly through a liquid transmission pipeline by utilizing the oil pump, wherein at the moment, the nitrogen in the oil collecting assembly enters the fuel oil transmission pipeline through a gas transmission pipeline under the action of the oil pump;
s103, sucking residual oil remained in the fuel oil transmission pipeline into the vacuum pumping assembly by utilizing the vacuum pumping assembly; wherein the vacuum pumping assembly is arranged on the liquid transmission pipeline and is communicated with the liquid transmission pipeline;
S104, closing the gas transmission pipeline and keeping the liquid transmission pipeline on; closing communication between the air supply assembly and the oil collection assembly; stopping the operation of the vacuum pumping assembly; and (3) inputting nitrogen into the fuel oil transmission pipeline by utilizing the air source assembly, wherein residual oil in the fuel oil transmission pipeline directly enters the oil collecting assembly from the liquid transmission pipeline or enters the oil collecting assembly through the vacuum oil pumping assembly under the pressure of the nitrogen.
Optionally, the method is characterized in that,
The gas transmission pipeline is made to be a first pipeline, and the liquid transmission pipeline is made to be a second pipeline;
in step S103, the vacuum pumping assembly is disposed on a third pipeline and is in communication with the third pipeline, and two ends of the third pipeline are in communication with the second pipeline;
In step S102, a fourth pipeline is disposed between the air source assembly and the oil collecting assembly; a fifth pipeline is arranged between the air source assembly and the fuel oil transmission pipeline.
Optionally, in step S101, a filtering component is further included; the fuel oil transmission pipeline comprises a first transmission pipeline and a second transmission pipeline which are communicated with the filter sub-assembly, the first transmission pipeline is provided with a pressure connector A for connecting an oil discharging aircraft, and the second transmission pipeline is provided with a pressure connector B for connecting an oil filling aircraft; wherein the first pipeline is communicated with the second transmission pipeline; the second pipeline and the fifth pipeline are communicated with the first transmission pipeline.
Optionally, step S102 includes:
s1021, communicating the pressure connector A with the first pipeline, and communicating the pressure connector B with the first transmission pipeline;
s1022, disconnecting the first transmission pipeline and the second transmission pipeline from the filter component;
s1023, keeping the first pipeline and the second pipeline conducted;
S1024, keeping the fourth pipeline on, and inputting nitrogen to the oil collecting assembly through the fourth pipeline by utilizing the air source assembly, wherein the air pressure value of the nitrogen is kept to be a first air pressure;
S1025, conveying the residual fuel oil in the first transmission pipeline and the second transmission pipeline to the oil collecting assembly through the second pipeline by utilizing the oil pump on the first transmission pipeline.
Optionally, the vacuum pumping assembly comprises a vacuum tank, a sixth pipeline and a vacuum pump which are sequentially communicated; step S103 includes:
And conducting the third pipeline and the sixth pipeline, and pumping residual fuel oil in the first transmission pipeline and the second transmission pipeline into the vacuum tank through the second pipeline and the third pipeline by utilizing the vacuum pump.
Optionally, a buffer tank is arranged on the fifth pipeline; step S104 includes:
S1041, disconnecting the first pipeline from the pressure joint A, and disconnecting the first transmission pipeline from the pressure joint B;
S1042, disconnecting the first pipeline, the fourth pipeline and the sixth pipeline;
S1043, adjusting a pressure reducing valve on the fifth pipeline to reduce the air pressure of the air source assembly to a second air pressure, at the moment, conducting a pipeline between the buffer tank and the air source assembly to enable nitrogen to be filled into the buffer tank, and conducting a pipeline between the buffer tank and the first transmission pipeline when the pressure value of the buffer tank reaches a third air pressure, wherein at the moment, residual oil in the first transmission pipeline directly enters the oil collecting assembly through the second pipeline under the pressure of the nitrogen or enters the oil collecting assembly from the second pipeline and the third pipeline through the vacuum oil pumping assembly.
Optionally, a liquid flowmeter is arranged on the second pipeline; the third pipeline is provided with a discharge valve; step S104 further includes:
s1044, disconnecting the third pipeline from the second pipeline when the numerical value of the liquid flowmeter does not change obviously; and slowly opening the discharge valve, and if the mixed gas is discharged, indicating that the residual oil in the vacuum pumping assembly is lower than a specified value, discharging the residual oil and performing environmental protection treatment.
Optionally, the buffer tank is provided with a drain valve; step S104 further includes:
S1045, adjusting the pressure reducing valve, and keeping the air pressure unchanged when the pressure value of the buffer tank reaches the fourth air pressure; closing a pipeline between the buffer tank and the air source assembly, slowly opening the blow-down valve, discharging nitrogen and dirt in the buffer tank, and closing a pipeline between the buffer tank and the first transmission pipeline by half.
Optionally, step S104 further includes:
s1046, when the air pressure in the second pipeline reaches a preset threshold value, the second pipeline is disconnected from the first transmission pipeline.
Optionally, the oil collecting assembly is provided with an exhaust valve; after step S1046, when the oil-gas replacement of the fuel oil transmission pipeline of the aircraft needs to be performed again, the exhaust valve is opened to exhaust the nitrogen in the oil collecting assembly, and the pipeline between the second pipeline and the first transmission pipeline is conducted.
The technical scheme of the invention provides an oil-gas displacement method for an aircraft fuel transmission pipeline, which comprises the steps of transmitting fuel in an oil-discharging aircraft to a fuelling aircraft by using an oil pump and the fuel transmission pipeline, inputting nitrogen into an oil collecting assembly by using an air source assembly after the oil-gas displacement of the aircraft fuel transmission pipeline is finished, and pumping the fuel in the fuel transmission pipeline to the oil collecting assembly by using the oil pump through a liquid transmission pipeline, wherein at the moment, the nitrogen in the oil collecting assembly enters the fuel transmission pipeline through a gas transmission pipeline to finish the first negative-pressure oil pumping; after that, residual oil in the fuel oil transmission pipeline is pumped to the vacuum pumping assembly by utilizing the vacuum pumping assembly, so that the second negative pressure pumping is completed; after the two times of negative pressure oil pumping is finished, closing the gas transmission pipeline and keeping the liquid transmission pipeline on; closing the communication between the air source assembly and the oil collecting assembly; stopping the operation of the vacuum pumping assembly; and filling a proper amount of nitrogen into the fuel transmission pipeline by utilizing the air source assembly, and forcing out residual oil in the fuel transmission pipeline by using the nitrogen to finish primary positive pressure oil. Compared with the prior art that only one negative pressure oil pumping is performed, the oil-gas replacement method for the fuel oil transmission pipeline of the aircraft has the advantages that the oil pumping efficiency is higher due to the fact that the oil pumping is performed twice and the oil pumping is performed once, and most of residual oil in the fuel oil transmission pipeline can be discharged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of an oil and gas displacement device for an aircraft fuel line;
FIG. 2 is a flow chart of a method for displacing oil and gas in an aircraft fuel line according to an embodiment of the invention.
Icon: 110. a fuel delivery line; 1110. a first transfer line; 1120. a second transfer line; 121. a pressure joint A; 122. a pressure joint B; 130. an oil pump; 210. a first connecting line; 220. a second connecting pipeline; 30. a filtering component; 40. an oil collection assembly; 41. a safety valve; 42. an exhaust valve; 50. an air source assembly; 51. a pressure reducing valve; 52. pressure repairing ports; 610. a vacuum tank; 620. a discharge valve; 630. a vacuum gauge; 640. a vacuum pump; 710. a first pipeline; 711. a gas flow meter; 720. a second pipeline; 721. a liquid flow meter; 730. a third pipeline; 740. a fourth pipeline; 750. a fifth pipeline; 760. a sixth pipeline; 810. a buffer tank; 821. a blow-down valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
After the tank type fuelling vehicle finishes the fuelling operation to the aircraft, the fuel in the pipe (the pipeline connecting the tank type fuelling vehicle and the aircraft) is reversely pumped back to the fuelling vehicle-mounted fuel tank by utilizing the subsea valve and the fuel pump, and the defect is that the pumping is not thorough. At present, the cleanliness in the oil filling pipe is not explicitly required, and the oil storage amount in the oil filling pipe after oil pumping is also not specifically required. At present, the technical aspects of Guan Guanlu fuel recovery standards, clean maintenance and the like are still blank in various equipment for refueling, pumping and mutual fuel transmission among airplanes. Technical research is very necessary, and particularly, method research on pipeline oil gas replacement technology is very important for long pipelines and pipeline equipment with low use frequency.
Therefore, the invention provides an oil-gas displacement method for an aircraft fuel transmission pipeline.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an oil-gas displacement device for an aircraft fuel transmission pipeline according to an embodiment of the present invention.
The oil gas replacement device of the aircraft fuel transmission pipeline comprises:
A fuel transfer assembly comprising a fuel transfer line 110, an oil pump 130, and two pressure taps; the oil pump 130 is provided on the fuel delivery line 110; the two pressure connectors are respectively arranged at two ends of the fuel transmission pipeline 110;
The oil collecting assembly 40, there are gas transmission pipeline and liquid transmission pipeline between oil collecting assembly 40 and fuel transmission pipeline 110;
a gas source assembly 50 for outputting nitrogen; the fuel delivery line 110 and the fuel collection assembly 40 are both in communication with the air supply assembly 50;
a vacuum pumping assembly; one end of the vacuum pumping assembly communicates with the fuel transfer line 110 and the other end of the vacuum pumping assembly communicates with the fuel collection assembly 40.
The fuel transfer line 110 is used when two aircraft are being fuel displaced and the fuel collection assembly 40, the air supply assembly 50 and the vacuum pumping assembly are all in a closed state when fuel is being displaced. After the oil-gas replacement of the fuel transmission pipeline of the aircraft is finished, the fuel transmission assembly, the oil collection assembly 40, the air source assembly 50 and the vacuum oil pumping assembly are matched with each other to perform negative pressure oil pumping on the fuel transmission pipeline 110 twice, wherein the first time is to pump residual oil in the fuel transmission pipeline 110 to the oil collection assembly 40 by using the oil pump 130, and the second time is to pump residual oil in the fuel transmission pipeline 110 to the vacuum oil pumping assembly by using the vacuum oil pumping assembly. After the negative pressure oil pumping is finished, a proper amount of nitrogen is filled into the fuel transmission pipeline 110 by utilizing the air source assembly 50, and residual oil in the fuel transmission pipeline 110 is forced out by utilizing the pressure of the nitrogen. In summary, the combination of the two negative pressure pumping operations and the single positive pressure pumping operation can drain most of the remaining fuel in the fuel line 110.
The aircraft fuel transfer line oil and gas displacement device further includes a filter subassembly 30, one end of the filter subassembly 30 is communicated with the fuel transfer line 110, and the other end of the filter subassembly 30 is communicated with the oil collecting subassembly 40. After the fuel oil conveyed by the fuel oil conveying pipeline 110 is processed by the filtering sub-assembly 30, the fuel oil can be filtered and separated from oil and water, so that the cleanliness of the fuel oil is ensured, and pollutants are prevented from entering an aircraft fuel tank, so that the aircraft is prevented from having safety accidents.
The fuel transfer line 110 includes a first transfer line 1110 and a second transfer line 1120 that are independent of each other and do not communicate; one end of the first transmission pipeline 1110 is provided with a pressure joint A121 for connecting an oil discharging plane, and the other end of the first transmission pipeline 1110 is communicated with the filter sub-assembly 30; one end of the second transmission pipeline 1120 is provided with a pressure connector B122 for connecting with a refueled aircraft, and the other end of the second transmission pipeline 1120 is communicated with the filter sub-assembly 30.
The oil pump 130 may be disposed on the first transfer line 1110; the second transfer line 1120 may be provided with a flow meter for observing the flow rate of the fuel delivered by the second transfer line 1120. Ball valves are provided on both the first transfer line 1110 and the second transfer line 1120 to control the connection and disconnection between the first transfer line 1110 or the second transfer line 1120 and the filter element 30.
The fuel collection assembly 40 may include a fuel collection tank for storing fuel drawn from the fuel transfer line 110.
Let the gas transfer line be the first line 710 and the liquid transfer line be the second line 720. In some embodiments, the oil collection assembly 40 is communicated with the second transmission pipeline 1120 through a first pipeline 710, and a ball valve and a gas flowmeter 711 are arranged on the first pipeline 710. The oil collecting assembly 40 is communicated with the first transmission pipeline 1110 through a second pipeline 720, and a ball valve, a liquid flowmeter 721 and a one-way valve are arranged on the second pipeline 720, wherein the one-way valve is used for enabling fuel in the first transmission pipeline 1110 to flow to the oil collecting assembly 40.
The vacuum pumping assembly is disposed on the third pipe 730 and communicates with the third pipe 730, and both ends of the third pipe 730 communicate with the second pipe 720. In some embodiments, the vacuum pumping assembly comprises a vacuum tank 610, a sixth conduit 760, and a vacuum pump 640 in sequential communication. The third pipe 730 has an input pipe, i.e., a pipe for transferring fuel from the second pipe 720 to the vacuum tank 610, and an output pipe, on which a ball valve may be provided; the output line refers to a line that delivers oil from the vacuum tank 610 to the oil collection assembly 40, and may be provided with a drain valve 620 and a check valve for directing the fuel in the vacuum tank 610 to the oil collection assembly 40.
Wherein, the sixth pipeline 760 is provided with a ball valve for controlling the sixth pipeline 760 to be communicated or closed.
A vacuum gauge 630 for observing the degree of vacuum in the vacuum tank 610 may be provided on the vacuum tank 610.
A fourth pipeline 740 is arranged between the air source assembly 50 and the oil collecting assembly 40; a fifth line 750 is provided between the air supply assembly 50 and the fuel transfer line 110, i.e., the first transfer line 1110 communicates with the air supply assembly 50 via the fifth line. The gas source assembly 50 may include a nitrogen tank with an inlet line and an exhaust line, which may be a fourth line 740.
In some embodiments, the fourth conduit 740 and the fifth conduit 750 may be in communication, and the fourth conduit 740 is provided with a one-way valve, a flow meter, a ball valve, and a pressure reducing valve 51, wherein the one-way valve is used to introduce nitrogen in the gas source assembly 50 into the oil collection assembly 40. A buffer tank 810 may be disposed on the fifth pipeline 750, a check valve may be disposed between the buffer tank 810 and the first transmission pipeline 1110, a ball valve may be disposed on a pipeline between the check valve and the buffer tank 810, and a ball valve may be disposed on a pipeline between the buffer tank 810 and the pressure reducing valve 51.
Wherein both the buffer tank 810 and the air source assembly 50 are provided with pressure gauges for observing the pressure.
Referring to fig. 1 and 2, based on the above hardware structure, an embodiment of the oil-gas displacement method for an aircraft fuel transmission pipeline according to the present invention is provided, which includes the following steps:
S101, connecting pressure connectors at two ends of a fuel transmission pipeline 110 to the oil discharging aircraft and the oil filling aircraft respectively, pumping fuel in the oil discharging aircraft to the oil filling aircraft by utilizing an oil pump 130 and the fuel transmission pipeline 110, and disconnecting the fuel transmission pipeline 110 from the oil discharging aircraft and the oil filling aircraft.
Before the oil-gas replacement of the fuel oil transmission pipeline of the aircraft is carried out, all valves in the oil-gas replacement device of the fuel oil transmission pipeline of the aircraft are in a closed state and are connected with a grounding static wire.
When the fuel pump is replaced, the pipeline between the first transmission pipeline 1110 and the filter sub-assembly 30 is communicated, the pipeline between the second transmission pipeline 1120 and the filter sub-assembly 30 is communicated, and the fuel pump 130 on the first transmission pipeline 1110 is started to start fuel transmission. The maximum pressure at the pressure joint union may be 0.35MPa, and the output oil may be determined to meet the operating requirements by the oil quantity indication and the flow meter on the aircraft, and the fuel pump 130 on the first transfer line 1110 is closed to stop fuel delivery. And the pressure connector A121 and the grounding electrostatic wire are separated from the airplane, the pressure connector is automatically closed, the fuel cannot overflow, and the fuel transmission operation between the airplanes is completed.
S102, nitrogen is input into the oil collecting assembly 40 by utilizing the air source assembly 50, then the fuel oil in the fuel oil transmission pipeline 110 is pumped to the oil collecting assembly 40 by utilizing the oil pump 130 through the liquid transmission pipeline, and at the moment, the nitrogen in the oil collecting assembly 40 enters the fuel oil transmission pipeline 110 through the gas transmission pipeline under the action of the oil pump 130.
Step S102 includes:
S1021, communicating the pressure joint A121 with the first pipeline 710, and communicating the pressure joint B122 with the first transmission pipeline 1110; wherein, pressure joint A121 is used for connecting the oil extraction aircraft, and pressure joint B122 is used for connecting the refueled aircraft.
As shown in fig. 1, neither the first connection pipe 210 nor the second connection pipe 220 is present, the first connection pipe 210 is used to refer to the route of the pressure joint a121 connected to the first pipe 710, and the second connection pipe 220 is used to refer to the route of the pressure joint B122 connected to the first transmission pipe 1110.
S1022, disconnecting both the first transfer line 1110 and the second transfer line 1120 from the filter assembly 30; i.e., the ball valves on both the first transfer line 1110 and the second transfer line 1120 are closed.
S1023, the first pipeline 710 and the second pipeline 720 are kept in conduction, namely the second transmission pipeline 1120 is communicated with the oil collecting assembly 40, and the first transmission pipeline 1110 is communicated with the oil collecting assembly 40.
And S1024, keeping the fourth pipeline 740 conductive, and inputting nitrogen into the oil collecting assembly 40 through the fourth pipeline 740 by utilizing the air source assembly 50, wherein the air pressure value of the nitrogen is kept at the first air pressure. At this time, the fuel delivery line 110 has been filled with fuel and a small amount of air, and the initial value of the gas flow meter 711 on the first line 710 and the initial value of the liquid flow meter 721 on the second line 720 are recorded.
S1025, the oil pump 130 on the first transmission pipeline 1110 is utilized to convey the residual fuel in the first transmission pipeline 1110 and the second transmission pipeline 1120 to the oil collecting assembly 40 through the second pipeline 720. When the oil pump 130 is started, the fuel in the rubber tube (the first transmission pipeline 1110 and the second transmission pipeline 1120) is sucked into the oil pump 130 for the first time to enter the fuel transmission pipeline 110, and enters the fuel collection assembly 40 through the second pipeline 720, at this time, nitrogen enters the fuel transmission pipeline 110, namely, nitrogen enters the first transmission pipeline 1110 along the first connecting pipeline 210 through the pressure joint A121, nitrogen enters the second transmission pipeline 1120 from the first pipeline 710, and then enters the first transmission pipeline 1110 along the second connecting pipeline 220 through the pressure joint B122, so that the first replacement of nitrogen and fuel is completed. When the readings of the flow meters (including the gas flow meter 711 on the first pipeline 710 and the liquid flow meter 721 on the second pipeline 720) are unchanged, the oil pump 130 is turned off, the values of the gas flow meter 711 and the liquid flow meter 721 are read, the flow change is calculated, the value changes are compared, the theoretical oil gas displacement flow is the same, and the first negative pressure oil suction is completed.
The pumping of fuel in fuel transfer line 110 to collection assembly 40 by pump 130 is not complete, and if the fuel storage capacity in fuel transfer line 110 is 300L, then there may be 10% -20% of fuel remaining in fuel transfer line 110, about 30-60L.
S103, sucking residual oil remained in the fuel transmission pipeline 110 into the vacuum pumping assembly by utilizing the vacuum pumping assembly; the vacuum oil pumping assembly is arranged on the liquid transmission pipeline and is communicated with the liquid transmission pipeline;
Step S103 includes:
The third pipe 730 and the sixth pipe 760 are both connected, and the fuel remaining in the first transfer pipe 1110 and the second transfer pipe 1120 is pumped into the vacuum tank 610 through the second pipe 720 and the third pipe 730 by the vacuum pump 640. When the liquid flow meter 721 on the second line 720 is reading unchanged, the amount of flow change of the liquid flow meter 721 is recorded to determine the amount of fuel flow to be drawn by the vacuum pump 640. At this time, the fuel line 110 and the upper portion of the vacuum tank 610 are already filled with nitrogen, and the remaining oil is already stored in the lower portion of the vacuum tank 610. The second suction is completed, and the residual oil in the vacuum tank 610 may be discharged through the discharge valve 620, or may be further pressed into the oil collecting assembly 40 by air pressure.
To achieve the purpose of cleaning the fuel delivery line 110, further pressurization, i.e., positive pressure and pressure maintaining, is required to charge the fuel delivery line 110 with nitrogen.
S104, closing the gas transmission pipeline and keeping the liquid transmission pipeline on; closing communication between the air supply assembly 50 and the oil collection assembly 40; stopping the operation of the vacuum pumping assembly; the nitrogen is fed to the fuel transfer line 110 by the air supply assembly 50, and the residual oil in the fuel transfer line 110 is directly fed from the liquid transfer line to the oil collection assembly 40 or fed through the vacuum pumping assembly to the oil collection assembly 40 under nitrogen pressure.
Step S104 includes:
s1041, the connection between the first pipe 710 and the pressure joint a121 is disconnected, and the connection between the first transfer pipe 1110 and the pressure joint B122 is disconnected. At this time, the pressure joint flap is automatically closed, and the fuel delivery line 110 is filled with nitrogen at normal pressure.
S1042, disconnecting the first pipe 710, the fourth pipe 740, and the sixth pipe 760;
S1043, adjusting the pressure reducing valve 51 on the fifth pipeline 750 to reduce the air pressure of the air source assembly 50 to a second air pressure, wherein the second air pressure can be 0.5MPa, at this time, the pipeline between the buffer tank 810 and the air source assembly 50 is conducted, so that nitrogen is filled into the buffer tank 810, when the pressure value of the buffer tank 810 reaches a third air pressure, the third air pressure can be 0.3MPa, the pipeline between the buffer tank 810 and the first transmission pipeline 1110 is conducted, at this time, the residual oil in the first transmission pipeline 1110 directly enters the oil collecting assembly 40 through the second pipeline 720 under the pressure of nitrogen or enters the oil collecting assembly 40 from the second pipeline 720 and the third pipeline 730 through the vacuum oil pumping assembly. That is, when the nitrogen gas fills the upper space of the fuel delivery pipe 110 and continues to be pressurized (when the pressure is insufficient, the pressure is compensated by the pressure compensation port 52 on the air source assembly 50, the pressure compensation port 52 is used for connecting with an external nitrogen source), the last remaining fuel in the fuel delivery pipe 110 is pressed into the vacuum tank 610, and after the pressure is further applied, the fuel flows to the second pipe 720 through the third pipe 730 and flows into the fuel collection assembly 40. The amount of fuel remaining in the fuel delivery line 110 can be determined by the change in the liquid flow meter 721 in the second line 720.
The oil collecting assembly 40 is provided with a safety valve 41, and the upper nitrogen gas in the oil collecting assembly 40 is discharged through the safety valve 41 when the pressure of the upper nitrogen gas rises above a limit value.
The third pipe 730 is provided with a discharge valve 620; step S104 further includes:
S1044, disconnecting the third pipe 730 from the second pipe 720 when the value of the liquid flow meter 721 does not significantly change; the drain valve 620 is slowly opened, and if the mixed gas is discharged, it indicates that the residual oil in the vacuum pumping unit is lower than a specified value, and the residual oil is discharged and is environmentally friendly.
The buffer tank 810 is provided with a drain valve 821; step S104 further includes:
S1045, regulating the pressure reducing valve 51, and keeping the air pressure unchanged when the pressure value of the buffer tank 810 reaches the fourth air pressure, wherein the fourth air pressure can be 0.15MPa; closing the line between the buffer tank 810 and the gas source assembly 50, slowly opening the blow down valve 821, draining the nitrogen and contaminants from the buffer tank 810, and closing the line between the buffer tank 810 and the first transfer line 1110 by half.
Step S104 further includes:
S1046, when the air pressure in the second pipeline 720 reaches a preset threshold value, the threshold value may be 0.2-0.3MPa, and the connection between the second pipeline 720 and the first transmission pipeline 1110 is disconnected. At this time, the fuel transmission pipeline 110 keeps positive pressure of nitrogen to isolate oxygen, so as to effectively avoid bacteria breeding of the fuel transmission pipeline 110 in the idle process.
The oil collection assembly 40 is provided with an exhaust valve 42; after step S1046, when the fuel oil displacement of the fuel oil transfer line of the aircraft is required again, the vent valve 42 is opened to vent the nitrogen in the fuel collection assembly 40, and the line between the second line 720 and the first transfer line 1110 is conducted.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. An oil-gas displacement method for an aircraft fuel transmission pipeline is characterized by comprising the following steps of:
S101, respectively connecting pressure connectors at two ends of a fuel transmission pipeline with an oil discharging aircraft and a refueling aircraft, pumping fuel in the oil discharging aircraft to the refueling aircraft by utilizing an oil pump and the fuel transmission pipeline, and disconnecting the fuel transmission pipeline from the oil discharging aircraft and the refueling aircraft;
S102, inputting nitrogen into an oil collecting assembly by utilizing an air source assembly, and pumping fuel oil in a fuel oil transmission pipeline to the oil collecting assembly through a liquid transmission pipeline by utilizing the oil pump, wherein at the moment, the nitrogen in the oil collecting assembly enters the fuel oil transmission pipeline through a gas transmission pipeline under the action of the oil pump;
s103, sucking residual oil remained in the fuel oil transmission pipeline into the vacuum pumping assembly by utilizing the vacuum pumping assembly; wherein the vacuum pumping assembly is arranged on the liquid transmission pipeline and is communicated with the liquid transmission pipeline;
S104, closing the gas transmission pipeline and keeping the liquid transmission pipeline on; closing communication between the air supply assembly and the oil collection assembly; stopping the operation of the vacuum pumping assembly; and (3) inputting nitrogen into the fuel oil transmission pipeline by utilizing the air source assembly, wherein residual oil in the fuel oil transmission pipeline directly enters the oil collecting assembly from the liquid transmission pipeline or enters the oil collecting assembly through the vacuum oil pumping assembly under the pressure of the nitrogen.
2. A method of displacing fuel from an aircraft fuel line as claimed in claim 1,
The gas transmission pipeline is made to be a first pipeline, and the liquid transmission pipeline is made to be a second pipeline;
in step S103, the vacuum pumping assembly is disposed on a third pipeline and is in communication with the third pipeline, and two ends of the third pipeline are in communication with the second pipeline;
In step S102, a fourth pipeline is disposed between the air source assembly and the oil collecting assembly; a fifth pipeline is arranged between the air source assembly and the fuel oil transmission pipeline.
3. The aircraft fuel transfer line oil and gas displacement method of claim 2, further comprising a filter subassembly in step S101; the fuel oil transmission pipeline comprises a first transmission pipeline and a second transmission pipeline which are communicated with the filter sub-assembly, the first transmission pipeline is provided with a pressure connector A for connecting an oil discharging aircraft, and the second transmission pipeline is provided with a pressure connector B for connecting an oil filling aircraft; wherein the first pipeline is communicated with the second transmission pipeline; the second pipeline and the fifth pipeline are communicated with the first transmission pipeline.
4. A method of replacing fuel oil in an aircraft fuel delivery line according to claim 3, wherein step S102 comprises:
s1021, communicating the pressure connector A with the first pipeline, and communicating the pressure connector B with the first transmission pipeline;
s1022, disconnecting the first transmission pipeline and the second transmission pipeline from the filter component;
s1023, keeping the first pipeline and the second pipeline conducted;
S1024, keeping the fourth pipeline on, and inputting nitrogen to the oil collecting assembly through the fourth pipeline by utilizing the air source assembly, wherein the air pressure value of the nitrogen is kept to be a first air pressure;
S1025, conveying the residual fuel oil in the first transmission pipeline and the second transmission pipeline to the oil collecting assembly through the second pipeline by utilizing the oil pump on the first transmission pipeline.
5. The aircraft fuel transfer line oil and gas displacement method of claim 4, wherein said vacuum pumping assembly comprises a vacuum tank, a sixth line and a vacuum pump in sequential communication; step S103 includes:
And conducting the third pipeline and the sixth pipeline, and pumping residual fuel oil in the first transmission pipeline and the second transmission pipeline into the vacuum tank through the second pipeline and the third pipeline by utilizing the vacuum pump.
6. The method for displacing oil and gas from an aircraft fuel line according to claim 5, wherein a buffer tank is provided on the fifth line; step S104 includes:
S1041, disconnecting the first pipeline from the pressure joint A, and disconnecting the first transmission pipeline from the pressure joint B;
S1042, disconnecting the first pipeline, the fourth pipeline and the sixth pipeline;
S1043, adjusting a pressure reducing valve on the fifth pipeline to reduce the air pressure of the air source assembly to a second air pressure, at the moment, conducting a pipeline between the buffer tank and the air source assembly to enable nitrogen to be filled into the buffer tank, and conducting a pipeline between the buffer tank and the first transmission pipeline when the pressure value of the buffer tank reaches a third air pressure, wherein at the moment, residual oil in the first transmission pipeline directly enters the oil collecting assembly through the second pipeline under the pressure of the nitrogen or enters the oil collecting assembly from the second pipeline and the third pipeline through the vacuum oil pumping assembly.
7. The method of replacing oil and gas in an aircraft fuel transfer line of claim 6, wherein a liquid flow meter is provided on the second line; the third pipeline is provided with a discharge valve; step S104 further includes:
s1044, disconnecting the third pipeline from the second pipeline when the numerical value of the liquid flowmeter does not change obviously; and slowly opening the discharge valve, and if the mixed gas is discharged, indicating that the residual oil in the vacuum pumping assembly is lower than a specified value, discharging the residual oil and performing environmental protection treatment.
8. The method of replacing fuel oil in an aircraft fuel oil transfer line of claim 7, wherein the surge tank is provided with a blow down valve; step S104 further includes:
S1045, adjusting the pressure reducing valve, and keeping the air pressure unchanged when the pressure value of the buffer tank reaches the fourth air pressure; closing a pipeline between the buffer tank and the air source assembly, slowly opening the blow-down valve, discharging nitrogen and dirt in the buffer tank, and closing a pipeline between the buffer tank and the first transmission pipeline by half.
9. The aircraft fuel transfer line oil and gas displacement method of claim 8, wherein step S104 further comprises:
s1046, when the air pressure in the second pipeline reaches a preset threshold value, the second pipeline is disconnected from the first transmission pipeline.
10. The aircraft fuel transfer line oil and gas displacement method of claim 9, wherein said oil collection assembly is provided with an exhaust valve; after step S1046, when the oil-gas replacement of the fuel oil transmission pipeline of the aircraft needs to be performed again, the exhaust valve is opened to exhaust the nitrogen in the oil collecting assembly, and the pipeline between the second pipeline and the first transmission pipeline is conducted.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767652A (en) * | 2009-12-30 | 2010-07-07 | 南京航空航天大学 | Fuel washing device for aircraft refueling vehicle |
| CN107150811A (en) * | 2017-04-19 | 2017-09-12 | 中国航空工业集团公司西安飞机设计研究所 | A kind of aircraft oil pumping system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000159297A (en) * | 1998-11-30 | 2000-06-13 | Mk Seiko Co Ltd | Oil extraction device |
| US6860300B1 (en) * | 2003-10-21 | 2005-03-01 | Spokane Industries, Inc. | Aircraft defueling system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767652A (en) * | 2009-12-30 | 2010-07-07 | 南京航空航天大学 | Fuel washing device for aircraft refueling vehicle |
| CN107150811A (en) * | 2017-04-19 | 2017-09-12 | 中国航空工业集团公司西安飞机设计研究所 | A kind of aircraft oil pumping system |
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