Aircraft fuel supply and fuel transfer system and method

Abstract

A fuel supply and fuel transfer system includes a central fuel tank and a left wing fuel tank and a right wing fuel tank respectively arranged on both sides of the central fuel tank. The fuel can be transferred from the central fuel tank to the fuel tanks of the two wings. In addition, the fuel tanks of the two wings are respectively formed with a collecting tank, and a pipeline is provided for transferring fuel from the remaining parts of the fuel tanks of the two wings to the collecting tank. The structure can achieve the goal of flexible control and intelligent management of the fuel transfer process from the central fuel tank to the wing fuel tanks on both sides, and can also transfer and remove water from the central fuel tank in real time. It also relates to an operation method of the fuel supply and fuel transfer system.

Description

Technical Field

[0001] The invention relates to a fuel supply system for an aircraft, and in particular to an aircraft oil supply and fuel transfer system and a related method. Background Art

[0002] The fuel system is one of the important systems of an aircraft. It supplies fuel to the aircraft's engine and auxiliary power unit (APU) and ensures fuel supply safety. In addition, the fuel system also controls the fuel consumption sequence of each tank to coordinate with the aircraft's load control and improve the economy of aircraft operation.

[0003] In the prior art, the fuel supply methods for aircraft engines mainly include direct fuel supply, override fuel supply, transfer fuel supply, etc. In terms of fuel transfer, there are transfer by electric pump, injection pump, gravity transfer, bleed air pressure transfer, etc. Among the existing fuel supply and fuel transfer systems for aircraft, there are mainly the following.

[0004] One is a combination of direct fuel supply and injection transfer. The aircraft includes a left wing fuel tank and a right wing fuel tank, and two AC transfer pumps are respectively provided on each fuel tank to supply fuel to the engine. In addition, an injection pump is also provided, which transfers fuel to maintain the liquid level of the oil collection tank.

[0005] One is a combination of override fuel supply and injection fuel supply or gravity fuel supply. Among them, the engine fuel supply adopts an override structure, and the override pump set in the central tank overrides the main fuel supply pump of the wing tank. In addition, the fuel transfer from the central tank to the oil collection tank is an injection transfer, in which the transfer from the central tank to the oil collection tank is internally controlled by the transfer float valve. The fuel transfer from the wing tank to the oil collection tank also adopts injection transfer, and this transfer is uncontrolled and continues. The fuel transfer from the wing tank to the oil collection tank also adopts gravity transfer.

[0006] The other is transfer oil supply. In the transfer oil supply structure, two oil supply pumps are set for each oil collection tank, and a backup pump is set outside the oil collection tank. A transfer pump is installed in the central oil tank to transfer fuel from the central oil tank.

[0007] Another type is bleed air pressurized transfer. Bleed air pressurized transfer is usually used in aircraft with auxiliary fuel tanks. In this case, fuel is transferred from the auxiliary fuel tank to the main fuel tank of the aircraft by pressurized air.

[0008] In the application, it was noticed that there were some problems with the existing fuel supply and fuel transfer system. For example, the control method of fuel transfer from the central tank to the wing tank was relatively simple, which could not meet the requirements of flexible control and intelligent management, and the effect of water removal in the transfer of the central tank was limited.

[0009] Secondly, for aircraft with three fuel tanks (central tank plus wing tanks on both sides), the central tank has a large fuel capacity, so it is preferred to use the fuel in the central tank first. In the current existing fuel supply and fuel transfer system, whether it is based on electric pumps to transfer fuel from the central tank to the wing tanks or using override pumps for override fuel supply, it will cause long-term additional energy consumption.

[0010] In addition, when using override fuel supply, the override pump of the center tank is the largest power consumer and heat generator in the center tank, which causes certain difficulties in the ignition source protection of the tank and the temperature control of the main landing gear compartment.

[0011] In an existing three-tank configuration of an aircraft, an override fuel supply structure is set in the central tank to supply fuel to the engine, and a transfer pipeline is also set to transfer fuel from the central tank to the wing tank. On the one hand, this transfer is conducive to reducing the load of the aircraft wing and improving the operating efficiency of the aircraft. On the other hand, it can improve the fuel availability of the central tank. In this configuration, a transfer float valve is set at the outlet of the transfer pipeline to control the fuel transfer. However, such a configuration also has some shortcomings.

[0012] First, the start or end of fuel transfer in this configuration depends on the oil level of the wing tank. The start and end of fuel transfer directly correspond to the position of the transfer float valve. Therefore, the control of fuel transfer is still not flexible enough.

[0013] Furthermore, the transfer float valve is located close to the outside of the wing tank, so a longer transfer pipeline is required, which increases the overall weight of the aircraft and places higher demands on the injection capacity of the transfer injection pump.

[0014] Additionally, in this configuration, the timing of the center tank transfer opening may be late, resulting in the inability to remove water from the center tank in the early stages of the flight.

[0015] Therefore, it is necessary to further improve the fuel supply and fuel transfer system of the aircraft to overcome the above-mentioned technical problems existing in the existing system. Summary of the invention

[0016] The present invention is made to solve the problems existing in the prior art described above. The purpose of the present invention is to provide an improved fuel supply and fuel transfer system for aircraft, which can realize flexible control of fuel transfer from the center tank to the wing tank.

[0017] The present invention provides an oil supply and fuel transfer system, which includes a central oil tank and a left wing oil tank and a right wing oil tank respectively arranged on both sides of the central oil tank. A first transfer pipeline is arranged between the left wing oil tank and the central oil tank, a first fuel transfer pump is arranged on the first transfer pipeline, and is used to transfer fuel from the central oil tank to the left wing oil tank, a portion of the left wing oil tank close to the central oil tank is formed as a left wing oil collecting tank, and at least one left wing oil tank supply pump is arranged in the left wing oil collecting tank, and is used to deliver fuel to the left wing engine, a third transfer pipeline is arranged between the left wing oil collecting tank and a portion of the left wing oil tank outside the left wing oil collecting tank, and a third fuel transfer pump is arranged in the third transfer pipeline, and is used to transfer fuel from the portion of the left wing oil tank outside the left wing oil collecting tank to the left wing oil collecting tank. Similarly, a second transfer pipeline is provided between the right wing fuel tank and the central fuel tank, and a second fuel transfer pump is provided on the second transfer pipeline for transferring fuel from the central fuel tank to the right wing fuel tank; the portion of the right wing fuel tank close to the central fuel tank is formed as a right wing fuel collecting tank, and at least one right wing fuel tank supply pump is provided in the right wing fuel collecting tank for delivering fuel to the right wing engine; a fourth transfer pipeline is provided between the right wing fuel collecting tank and the portion of the right wing fuel tank outside the left wing fuel collecting tank, and a fourth fuel transfer pump is provided in the fourth transfer pipeline for transferring fuel from the portion of the right wing fuel tank outside the right wing fuel collecting tank to the right wing fuel collecting tank. A control device is also included, which controls at least the fuel transfer via the first transfer pipeline, the second transfer pipeline, the third transfer pipeline, and the fourth transfer pipeline.

[0018] The control device can control the fuel transfer by controlling the first to fourth fuel transfer pumps, or can also control the fuel transfer by controlling other components on each transfer pipeline, such as controlling the cut-off valves on each transfer pipeline mentioned below, etc.

[0019] The fuel supply and fuel transfer system of the present invention can achieve the goal of flexible control and intelligent management of the fuel transfer process from the central tank to the wing tanks on both sides, and can also timely remove water from the central tank during transfer. In addition, while achieving the purpose of preferential consumption of fuel in the central tank, it can also reduce energy consumption because it can omit the override fuel supply architecture.

[0020] Preferably, at least one of the first fuel transfer pump, the second fuel transfer pump, the third fuel transfer pump and the fourth fuel transfer pump is an ejector pump.

[0021] Preferably, the left wing oil collecting tank and the right wing oil collecting tank are formed in the form of a semi-sealed rib. Specifically, a first semi-sealed rib is provided in the left wing oil tank, and the portion of the left wing oil tank near the central oil tank of the first semi-sealed rib forms the left wing oil collecting tank. Similarly, a second semi-sealed rib is provided in the right wing oil tank, and the portion of the right wing oil tank near the central oil tank of the second semi-sealed rib forms the right wing oil collecting tank.

[0022] Preferably, a first transfer check valve is provided on the first transfer pipeline, and the first transfer check valve is configured to prevent fuel from flowing back from the left wing tank to the central tank. A second transfer check valve is provided on the second transfer pipeline, and the second transfer check valve is configured to prevent fuel from flowing back from the right wing tank to the central tank. A third transfer check valve is provided on the third transfer pipeline, and the third transfer check valve is configured to prevent fuel from flowing back from the left wing tank. A fourth transfer check valve is provided on the fourth transfer pipeline, and the fourth transfer check valve is configured to prevent fuel from flowing back from the right wing tank. These check valves can prevent the transferred fuel from flowing back along the first and second transfer pipelines. For example, it can prevent the fuel from flowing back from the left wing tank to the portion of the left wing tank outside the left wing tank, from the right wing tank to the portion of the right wing tank outside the right wing tank, or from the left wing tank and the right wing tank to other parts of the aircraft fuel system, etc.

[0023] Preferably, the lower part of the first half sealing rib is provided with a first rib check valve, and the upper part of the first half sealing rib is provided with at least one first hole. Similarly, the lower part of the second half sealing rib is provided with a second rib check valve, and the upper part of the second half sealing rib is provided with at least one second hole.

[0024] Here, the first and second rib one-way valves can prevent fuel from flowing from the left wing oil collecting tank and the right wing oil collecting tank into other parts of the left wing oil tank and the right wing oil tank, and the first hole and the second hole act as ventilation and oil overflow holes, that is, when the fuel level in the oil collecting tank is low, ventilation is performed, and when the fuel level in the oil collecting tank is high, the fuel therein is allowed to overflow to the outside of the oil collecting tank.

[0025] Preferably, the dynamic flow used by at least one of the third fuel transfer pump and the fourth fuel transfer pump during operation is an annular jet flow, which can help prevent the dynamic flow channel from being blocked by debris, thereby reducing the ejection capacity of the ejection pump.

[0026] Preferably, the first transfer pipeline extends from the central fuel tank to the left wing fuel tank or the left wing fuel collecting tank, so that the fuel can be transferred from the central fuel tank to the left wing fuel tank or the left wing fuel collecting tank. Similarly, the second transfer pipeline can also extend from the central fuel tank to the right wing fuel tank or the right wing fuel collecting tank, so that the fuel can be transferred from the central fuel tank to the right wing fuel tank or the right wing fuel collecting tank. Such an arrangement can shorten the length of the transfer pipeline, reduce the difficulty of installation and arrangement, and reduce the weight of the system and reduce the requirements for the injection capacity of the injection pump.

[0027] Preferably, a first transfer cut-off valve is further provided on the first transfer pipeline; and / or a second transfer cut-off valve is further provided on the second transfer pipeline. The provision of the first transfer cut-off valve and the second transfer cut-off valve further improves the flexibility of fuel transfer.

[0028] Preferably, the first transfer cut-off valve is a valve with adjustable opening; and / or the second transfer cut-off valve is a valve with adjustable opening. This structure also helps to improve the flexibility and accuracy of fuel transfer regulation.

[0029] Preferably, a left wing fuel tank transfer pipe cut-off valve is further provided on the third transfer pipeline; and / or a right wing fuel tank transfer pipe cut-off valve is further provided on the fourth transfer pipeline.

[0030] Preferably, the central fuel tank is further provided with: a first override pump, the first override pump is used for over-controlling fuel supply to the left wing engine; and / or a second override pump, the second override pump is used for over-controlling fuel supply to the right wing engine.

[0031] Also disclosed is a method for operating the fuel supply and fuel transfer system as described above, the method comprising the following steps:

[0032] Setting a first predetermined value, the first predetermined value being less than the maximum fuel capacity of the left wing fuel tank and / or the right wing fuel tank; setting a second predetermined value, the second predetermined value being greater than or equal to the first preset value; and setting a third predetermined value, the third predetermined value being less than the difference between the maximum fuel capacity of the left wing fuel tank and / or the right wing fuel tank and the first predetermined value;

[0033] When the fuel level in the left wing tank is lower than a first predetermined value, the fuel transfer from the center tank to the left wing tank is started, and when the fuel level in the left wing tank is higher than a second predetermined value, the fuel transfer from the center tank to the left wing tank is closed; and / or when the fuel level in the right wing tank is lower than a first predetermined value, the fuel transfer from the center tank to the right wing tank is started, and when the fuel level in the right wing tank is higher than a second predetermined value, the fuel transfer from the center tank to the right wing tank is closed; and

[0034] When the fuel level in the center tank is lower than a third predetermined value, the fuel transfer from the center tank to the left wing tank and / or the right wing tank is continuously performed, and after the fuel level in the center tank reaches zero, the fuel transfer is continued for a predetermined time, and then the fuel transfer to the left wing tank and / or the right wing tank is closed. Here, the information that the fuel level is zero can be obtained through a cockpit display or the like.

[0035] Here, the first, second and third predetermined values ​​can be set and modified by the control device. The amount of fuel in the fuel tank can be detected by a sensor known in the prior art, and the data is transmitted to the control device. The control device is, for example, a computer.

[0036] Preferably, the fuel in the center tank is transferred to the left wing collecting tank, and when the fuel transfer from the center tank to the left wing collecting tank is closed, the fuel transfer from the part of the left wing tank outside the left wing collecting tank to the left wing collecting tank is opened. The fuel in the center tank is transferred to the right wing collecting tank, and when the fuel transfer from the center tank to the right wing collecting tank is closed, the fuel transfer from the part of the right wing tank outside the right wing collecting tank to the right wing collecting tank is opened.

[0037] Preferably, the method further comprises: adjusting a fuel transfer rate from the center tank to the left wing tank; and / or adjusting a fuel transfer rate from the center tank to the right wing tank.

[0038] Preferably, the method further comprises: overriding fuel supply from the center fuel tank to the left wing engine; and / or overriding fuel supply from the center fuel tank to the right wing engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The specific implementation of the present invention can be more clearly understood from the structures shown in the accompanying drawings, wherein:

[0040] Figure 1 The diagram shows the structure of the fuel supply and fuel transfer system of the first embodiment of the present invention.

[0041] Figure 2 A schematic structural diagram of an oil supply and fuel transfer system according to a second embodiment of the present invention is shown.

[0042] Figure 3 A schematic structural diagram of an oil supply and fuel transfer system according to a third embodiment of the present invention is shown.

[0043] Figure 4 A schematic structural diagram of an oil supply and fuel transfer system according to a fourth embodiment of the present invention is shown.

[0044] (Explanation of symbols)

[0045] 100 Fuel supply and fuel transfer system

[0046] 110 Central fuel tank

[0047] 111 First transfer ejector pump

[0048] 112 Second transfer ejector pump

[0049] 113 First transfer check valve

[0050] 114 Second transfer check valve

[0051] 115 First transfer cut-off valve

[0052] 116 Second transfer cut-off valve

[0053] 117 Central tank oil supply cut-off valve

[0054] 120 Left wing fuel tank

[0055] 121 First half sealing rib

[0056] 122 Left wing oil tank

[0057] 123 The third transfer injection pump

[0058] 124 Left wing fuel tank fuel supply pump

[0059] 125 Third transfer check valve

[0060] 126 Left wing fuel tank oil supply check valve

[0061] 127 Left wing fuel tank oil supply cut-off valve

[0062] 130 Right wing fuel tank

[0063] 131 Second half sealing rib

[0064] 132 Right wing oil tank

[0065] 133 Fourth transfer injection pump

[0066] 134 Right wing fuel tank supply pump

[0067] 135 Fourth transfer check valve

[0068] 136 Right wing fuel tank oil supply check valve

[0069] 137 Right wing fuel tank oil supply cut-off valve

[0070] 141 Left wing engine

[0071] 142 Right wing engine

[0072] 151 First transfer pipeline

[0073] 152 Second transfer pipeline

[0074] 153 The third transfer pipeline

[0075] 154 Fourth transfer pipeline

[0076] 155 First oil supply line

[0077] 156 Second oil supply line

[0078] 157 Central tank fuel supply pipeline

[0079] 200 Fuel supply and fuel transfer system

[0080] 210 Central fuel tank

[0081] 211 First transfer ejector pump

[0082] 212 Second transfer ejector pump

[0083] 213 First transfer check valve

[0084] 214 Second transfer check valve

[0085] 215 First transfer cut-off valve

[0086] 216 Second transfer cut-off valve

[0087] 217 Central tank oil supply cut-off valve

[0088] 220 Left wing fuel tank

[0089] 221 First half sealing rib

[0090] 222 Left wing oil tank

[0091] 223 The third transfer injection pump

[0092] 224 Left wing fuel tank fuel supply pump

[0093] 225 Third transfer check valve

[0094] 226 Left wing fuel tank oil supply check valve

[0095] 227 Left wing fuel tank oil supply cut-off valve

[0096] 228 Left wing fuel tank transfer pipe cut-off valve

[0097] 230 Right wing fuel tank

[0098] 231 Second half sealing rib

[0099] 232 Right wing oil tank

[0100] 233 Fourth transfer injection pump

[0101] 234 Right wing fuel tank fuel supply pump

[0102] 235 Fourth transfer check valve

[0103] 236 Right wing fuel tank supply check valve

[0104] 237 Right wing fuel tank oil supply cut-off valve

[0105] 238 Right wing fuel tank transfer pipe cut-off valve

[0106] 241 Left wing engine

[0107] 242 Right wing engine

[0108] 251 First transfer pipeline

[0109] 252 Second transfer pipeline

[0110] 253 The third transfer pipeline

[0111] 254 Fourth transfer pipeline

[0112] 300 Fuel supply and fuel transfer system

[0113] 310 Central tank

[0114] 311 First transfer ejector pump

[0115] 312 Second transfer ejector pump

[0116] 313 First transfer check valve

[0117] 314 Second transfer check valve

[0118] 315 First adjustable transfer cut-off valve

[0119] 316 Second adjustable transfer cut-off valve

[0120] 320 Left wing fuel tank

[0121] 321 First half sealing rib

[0122] 322 Left wing oil tank

[0123] 330 Right wing fuel tank

[0124] 331 Second half sealing rib

[0125] 332 Right wing oil tank

[0126] 351 First transfer pipeline

[0127] 352 Second transfer pipeline

[0128] 400 Fuel supply and fuel transfer system

[0129] 410 Central Fuel Tank

[0130] 411 First Override Pump

[0131] 412 Second Override Pump

[0132] 420 Left wing fuel tank

[0133] 421 First half sealing rib

[0134] 422 Left wing oil tank

[0135] 430 Right wing fuel tank

[0136] 431 Second half sealing rib

[0137] 432 Right wing oil tank

[0138] 441 Left Wing Engine

[0139] 442 Right Wing Engine DETAILED DESCRIPTION

[0140] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the drawings only show preferred embodiments of the present invention, which do not constitute a limitation on the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and the technical features of the different embodiments described below can be arbitrarily combined with each other without contradiction, which all fall within the scope of protection of the present invention.

[0141] <First Embodiment>

[0142] Figure 1 The schematic structure of the fuel supply and fuel transfer system 100 of the first embodiment of the present invention is shown. The fuel supply and fuel transfer system 100 includes a central fuel tank 110 and a left wing fuel tank 120 and a right wing fuel tank 130 located on both sides of the central fuel tank 110, respectively.

[0143] The fuel supply and fuel transfer system 100 includes a first transfer pipeline 151 from the central fuel tank 110 to the left wing fuel tank 120. The first transfer pipeline 151 is used to transfer fuel to the left wing fuel tank 120. That is, the first transfer pipeline 151 transfers the fuel in the central fuel tank 110 to the left wing fuel tank 120. Figure 1In the specific structure of the first embodiment shown, the first transfer pipeline 151 leads to the left wing fuel tank 120, and a first transfer priming pump 111 serving as a fuel transfer pump is provided on the first transfer pipeline 151. The fuel in the central fuel tank 110 is transferred to the left wing fuel tank 120 through the operation of the first transfer priming pump 111. Of course, if other forms of pumping devices are used as the fuel transfer pump, they are also within the scope of the present application.

[0144] Preferably, a first transfer check valve 113 is further provided in the first transfer pipeline 151, and a first transfer cut-off valve 115 may be further provided. The first transfer check valve 113 is configured to allow fuel to flow from the central tank 110 into the left wing tank 120, but prevent fuel from flowing back from the left wing tank 120 into the central tank 110. The first transfer cut-off valve 115 can be used to connect and cut off the transfer of fuel from the central tank 110 to the left wing tank 120.

[0145] As shown in the figure, the first transfusion check valve 113 is located at the first transfusion injection pump 111. Of course, the first transfusion check valve 113 can also be located downstream of the first transfusion injection pump 111. Alternatively, a check valve can be provided both upstream and downstream of the first transfusion injection pump 111. All of these are within the scope of the present invention.

[0146] The fuel supply and fuel transfer system 100 is also provided with a second transfer pipeline 152 from the central fuel tank 110 to the right wing fuel tank 130. The second transfer pipeline 152 is used to transfer fuel to the right wing fuel tank 130, that is, to transfer the fuel in the central fuel tank 110 to the right wing fuel tank 130. Figure 1 In the specific structure of the first embodiment shown, the second transfer pipeline 152 leads to the right wing fuel tank 130, and a second transfer priming pump 112 is provided on the second transfer pipeline 152. Through the operation of the second transfer priming pump 112, the fuel in the central fuel tank 110 is transferred to the right wing fuel tank 130.

[0147] Preferably, a second transfer check valve 114 is further provided in the second transfer pipeline 152, and a second transfer cut-off valve 116 may be further provided. The second transfer check valve 114 is configured to allow fuel to flow from the central tank 110 into the right wing tank 130, but prevent fuel from flowing back from the right wing tank 130 into the central tank 110. The second transfer cut-off valve 116 can be used to connect and cut off the transfer of fuel from the central tank 110 to the right wing tank 130.

[0148] Similarly, the second transfusion check valve 114 may be disposed upstream or downstream of the second transfusion ejector pump 112 , or check valves may be disposed both upstream and downstream of the second transfusion ejector pump 112 .

[0149] The left wing oil tank 120 is provided with a first half sealing rib 121, and the portion of the left wing oil tank 120 on the side of the first half sealing rib 121 close to the central oil tank 110 serves as the left wing oil collecting tank 122. In other words, in the present invention, the left wing oil collecting tank 122 integrated in the left wing oil tank 120 is formed by the first half sealing rib 121 provided in the left wing oil tank 120. Figure 1 In the structure of the first embodiment shown, the first transfer pipeline 151 extends all the way to the portion of the left wing tank 120 located outside the left wing oil collecting tank 122. Therefore, the fuel in the center tank 110 is first transferred to the outside of the left wing oil collecting tank 122 through the first transfer pipeline 151.

[0150] A third transfer pipeline 153 is provided between the left wing oil collecting tank 122 and the rest of the left wing oil collecting tank 120 (i.e., the portion outside the left wing oil collecting tank 122), for transferring fuel from the left wing oil collecting tank 120 to the left wing oil collecting tank 122. A third transfer priming pump 123 and a preferred third transfer check valve 125 are provided on the third transfer pipeline 153. The third transfer priming pump 123 is used to transfer fuel from the portion of the left wing oil collecting tank 120 located outside the left wing oil collecting tank 122 to the left wing oil collecting tank 122. The third transfer check valve 125 is configured to allow fuel to flow from the outside of the left wing oil collecting tank 122 into the left wing oil collecting tank 122, but prevent fuel from flowing back from the left wing oil collecting tank 122 into the portion of the left wing oil collecting tank 120 located outside the left wing oil collecting tank 122.

[0151] The third transfer one-way valve 125 may be disposed upstream or downstream of the third transfer ejector pump 123 , or one-way valves may be disposed both upstream and downstream of the third transfer ejector pump 123 .

[0152] Preferably, the dynamic flow formed by the third transfer priming pump 123 when it is in operation is an annular jet. In addition, the third transfer priming pump 123 is arranged at a position corresponding to the lower part of the first half sealing rib 121, preferably close to the bottom of the left wing oil tank 120. In addition, at least one, preferably multiple first holes are arranged at the upper part of the first half sealing rib 121, or at a position close to the top of the left wing oil tank 120, and these first holes play the role of ventilation and oil overflow. Specifically, when the fuel level in the left wing oil collecting tank 122 is higher than the holes, the fuel can overflow from the left wing oil collecting tank 122 to the part of the left wing oil collecting tank 120 outside the left wing oil collecting tank 122 through these holes, and when the fuel level in the left wing oil collecting tank 122 is lower than the holes, ventilation can be performed through these holes.

[0153] At least one (two shown in the figure) left wing oil tank supply pump 124 is provided in the left wing oil collecting tank 122. The left wing oil tank supply pump 124 supplies oil to the left wing engine 141 through the first oil supply pipeline 155. A left wing oil tank supply cut-off valve 127 is provided on the first oil supply pipeline 155 to allow the fuel supply to the left wing engine 141 to be connected and cut off. Optionally, a left wing oil tank supply check valve 126 may also be provided on the first oil supply pipeline 155.

[0154] The structure of the right wing tank 130 may be similar to that of the left wing tank 120. Specifically, a second half sealing rib 131 is provided in the right wing tank 130, and a portion of the right wing tank 130 near the central tank 110 of the second half sealing rib 131 serves as a right wing oil collecting tank 132. In other words, in the present invention, the right wing oil collecting tank 132 integrated in the right wing tank 130 is formed by the second half sealing rib 131 provided in the right wing tank 130. Similar to the first transfer pipeline 151, the second transfer pipeline 152 extends all the way to the portion of the right wing tank 130 located outside the right wing oil collecting tank 132. Therefore, the fuel in the central tank 110 is first transferred to the outside of the right wing oil collecting tank 132 through the second transfer pipeline 152.

[0155] A fourth transfer pipeline 154 is provided between the right wing oil collecting tank 132 and the rest of the right wing oil collecting tank 130 (i.e., the portion outside the right wing oil collecting tank 132), for transferring fuel from the right wing oil collecting tank 130 to the right wing oil collecting tank 132. A fourth transfer priming pump 133 and a preferred fourth transfer check valve 135 are provided on the fourth transfer pipeline 154. The fourth transfer priming pump 133 is used to transfer fuel from the portion of the right wing oil collecting tank 130 located outside the right wing oil collecting tank 132 to the right wing oil collecting tank 132. The fourth transfer check valve 135 is configured to allow fuel to flow from the outside of the right wing oil collecting tank 132 into the right wing oil collecting tank 132, but prevent fuel from flowing back from the right wing oil collecting tank 132 into the portion of the right wing oil collecting tank 130 located outside the right wing oil collecting tank 132.

[0156] The fourth transfer one-way valve 135 may be disposed upstream or downstream of the fourth transfer ejector pump 133 , or one-way valves may be disposed both upstream and downstream of the fourth transfer ejector pump 133 .

[0157] The dynamic flow formed when the fourth transfer priming pump 133 is in operation is preferably also an annular jet. In addition, the fourth transfer priming pump 133 is arranged at a position corresponding to the lower part of the second half sealing rib 131, preferably close to the bottom of the right wing oil tank 130. In addition, at least one, preferably multiple second holes are also arranged at the upper part of the second half sealing rib 131, or at a position close to the top of the right wing oil tank 130. These second holes play the role of ventilation and oil overflow, specifically, the same function as the first hole on the first half sealing rib 121.

[0158] At least one (two shown in the figure) right wing oil tank supply pump 134 is also provided in the right wing oil collecting tank 132. The right wing oil tank supply pump 134 supplies oil to the right wing engine 142 through the second oil supply pipeline 156. A right wing oil tank supply cut-off valve 137 may preferably be provided on the second oil supply pipeline 156, and its function is the same as that of the left wing oil tank supply cut-off valve 127 in the left wing oil tank 120. Optionally, a right wing oil tank supply check valve 136 may also be provided on the second oil supply pipeline 156.

[0159] Preferably, as shown in the figure, a central tank oil supply pipeline 157 is further provided, and its two ends are respectively connected to the first oil supply pipeline 155 and the second oil supply pipeline 156, so as to allow cross-supply, that is, supply oil from the left wing oil tank 120 to the right wing engine 142, or supply oil from the right wing oil tank 130 to the left wing engine 141. Alternatively, oil can be supplied from the left wing oil tank 120 and the right wing oil tank 130 to the same engine at the same time. A central tank oil supply cut-off valve 117 can be provided on the central tank oil supply pipeline 157.

[0160] The following will describe Figure 1 The operating principle of the fuel supply and fuel transfer system 100 of the structure shown is:

[0161] First, the minimum value of the fuel amount in the left wing tank 120 (including the left wing oil collecting tank 122 therein), or the first predetermined value X1, is preset. When the fuel amount in the left wing tank 120 is lower than the first predetermined value X1, the first transfer cut-off valve 115 is opened, thereby starting the fuel transfer from the central tank 110 to the left wing tank 120. When the fuel amount in the left wing tank 120 is greater than or equal to a second predetermined value X2 greater than the first predetermined value X1, the first transfer cut-off valve 115 is closed, thereby stopping the fuel transfer from the central tank 110 to the left wing tank 120.

[0162] The control of the fuel transfer of the right wing tank 130 is the same as described above with respect to the left wing tank 120. That is, when the amount of fuel in the right wing tank 130 is lower than the first predetermined value X1, the second transfer cut-off valve 116 is opened to start the fuel transfer from the center tank 110 to the right wing tank 130, and when the amount of fuel in the right wing tank 130 is greater than or equal to the second predetermined value X2, the second transfer cut-off valve 116 is closed to stop the fuel transfer from the center tank 110 to the right wing tank 130.

[0163] When the amount of fuel in the center tank 110 is lower than the third predetermined value X3, the first transfer cut-off valve 115 and the second transfer cut-off valve 116 are opened, and the fuel transfer from the center tank 110 to the left wing tank 120 and the right wing tank 130 is continued. Moreover, after the amount of fuel in the center tank 110 displayed in the cockpit is zero or close to zero, the transfer process is continued for a preset time, and then the first transfer cut-off valve 115 and the second transfer cut-off valve 116 are closed. The third predetermined value X3 is smaller than the difference between the maximum fuel capacity of the left wing tank 120 or the right wing tank 130 and the first predetermined value X1.

[0164] Here, the amount of fuel in the central tank 110, the left wing tank 120, and the right wing tank 130 can be represented by the fuel level therein, and the fuel level can be monitored by providing a level sensor. The opening and closing of each cut-off valve can be realized, for example, by an additional controller (such as a computer). In addition, the controller can be connected to the sensor that monitors the fuel amount, so that control can be performed according to the fuel amount.

[0165] In addition, the first predetermined value X1, the second predetermined value X2 and the third predetermined value X3 can be changed according to actual needs, and the change of these values ​​can be achieved by modifying the computer program without operating or changing the mechanical structure.

[0166] <Second Embodiment>

[0167] Figure 2 The fuel supply and fuel transfer system 200 of the second embodiment of the present invention is shown. In the following description of the second embodiment, the technical features of the second embodiment that are different from the first embodiment will be mainly described. Unless there is a contrary description in the following content or there is a conflict with other technical features, the features described in the first embodiment are also applicable to the second embodiment and will not be described in detail here.

[0168] Similar to the fuel supply and fuel transfer system 100 of the first embodiment, the fuel supply and fuel transfer system 200 includes a central fuel tank 210 and a left wing fuel tank 220 and a right wing fuel tank 230 located on both sides of the central fuel tank 210 .

[0169] The oil supply and fuel transfer system 200 comprises a first transfer pipeline 251 from the central fuel tank 210 to the left wing fuel tank 220 . The first transfer pipeline 251 is provided with a first transfer priming pump 211 for transferring fuel to the left wing fuel tank 220 .

[0170] Preferably, a first transfer check valve 213 is further provided in the first transfer pipeline 251, and a first transfer cut-off valve 215 may be further provided. The first transfer check valve 213 is configured to allow fuel to flow from the central tank 210 into the left wing tank 220, but prevent fuel from flowing back from the left wing tank 220 into the central tank 210. The first transfer cut-off valve 215 can be used to connect and cut off the transfer of fuel from the central tank 210 to the left wing tank 220. The first transfer check valve 213 may be provided upstream or downstream of the first priming pump 211, or check valves may be provided upstream and downstream of the first transfer priming pump 211.

[0171] The oil supply and fuel transfer system 200 is also provided with a second transfer pipeline 252 from the central fuel tank 210 to the right wing fuel tank 230 . The second transfer pipeline 252 has a second transfer priming pump 212 for transferring fuel to the right wing fuel tank 230 .

[0172] Preferably, a second transfer check valve 214 is further provided in the second transfer pipeline 252, and a second transfer cut-off valve 216 may be further provided. The second transfer check valve 214 is configured to allow fuel to flow from the central tank 210 into the right wing tank 230, but prevent fuel from flowing back from the right wing tank 230 into the central tank 210. The second transfer cut-off valve 216 can be used to connect and cut off the transfer of fuel from the central tank 210 to the right wing tank 230.

[0173] The second transfusion check valve 214 may be disposed upstream or downstream of the second transfusion ejector pump 212 , or check valves may be disposed both upstream and downstream of the second transfusion ejector pump 212 .

[0174] The left wing oil tank 220 is provided with a first half sealing rib 221, and the portion of the left wing oil tank 220 near the first half sealing rib 221 and the central oil tank 210 serves as a left wing oil collecting tank 222, which is the same as that in the first embodiment. Figure 2 It can be seen that, unlike the first embodiment, the first transfer pipeline 251 extends into the left wing oil collecting tank 222, but does not further extend to the remaining portion of the left wing oil tank 220 located outside the left wing oil collecting tank 222. In this way, the length of the first transfer pipeline 251 can be effectively shortened, thereby facilitating the system layout difficulty and reducing the system weight.

[0175] A third transfer pipeline 253 is provided between the left wing oil collecting tank 222 and the rest of the left wing oil collecting tank 220 (i.e., the portion outside the left wing oil collecting tank 222) for transferring fuel from the left wing oil collecting tank 220 to the left wing oil collecting tank 222. As in the first embodiment, a third transfer priming pump 223 and a preferred third transfer check valve 225 are provided on the third transfer pipeline 253. Further, in the fuel supply and fuel transfer system 200 of the second embodiment, a left wing oil tank transfer pipe cut-off valve 228 is also provided on the third transfer pipeline 253, thereby allowing the fuel transfer from the portion of the left wing oil collecting tank 220 outside the left wing oil collecting tank 222 to the left wing oil collecting tank 222 to be controlled.

[0176] At least one (two shown in the figure) left wing oil tank supply pump 224 is provided in the left wing oil collecting tank 222 for supplying oil to the left wing engine 241, and the oil supply to the left wing engine 241 is controlled by a left wing oil tank supply cut-off valve 227. Optionally, a left wing oil tank supply check valve 226 may also be provided as shown in the figure.

[0177] The right wing oil tank 230 is provided with a second half sealing rib 231, and the portion of the right wing oil tank 230 near the second half sealing rib 231 on the side of the central oil tank 210 serves as the right wing oil collecting tank 232. Figure 2 It can be seen that, similar to the first transfer pipeline 251, the second transfer pipeline 252 extends into the right wing oil collecting tank 232, but does not further extend to the remaining portion of the right wing oil tank 230 located outside the right wing oil collecting tank 232. This helps to shorten the length of the second transfer pipeline 252, thereby also helping to reduce the difficulty of system layout and reduce the weight of the system.

[0178] A fourth transfer pipeline 254 is provided between the right wing oil collecting tank 232 and the rest of the right wing oil collecting tank 230 (i.e., the portion outside the right wing oil collecting tank 232), for transferring fuel from the right wing oil collecting tank 230 to the right wing oil collecting tank 232. A fourth transfer priming pump 233 and a preferred fourth transfer check valve 235 are provided on the fourth transfer pipeline 254. Similar to the third transfer pipeline 253, a right wing oil tank transfer pipeline cut-off valve 238 is also provided on the fourth transfer pipeline 254, for controlling the transfer of fuel from the portion of the right wing oil collecting tank 230 outside the right wing oil collecting tank 232 to the right wing oil collecting tank 232.

[0179] At least one (two shown in the figure) right wing oil tank supply pump 234 is also provided in the right wing oil collecting tank 232 for supplying oil to the right wing engine 242. In addition, the oil supply to the right wing engine 242 can be controlled by providing a right wing oil tank supply cut-off valve 237. Optionally, a right wing oil tank supply check valve 236 can also be provided as shown in the figure.

[0180] The following will describe Figure 2The operating principle of the fuel supply and fuel transfer system 200 of the structure shown is:

[0181] First, similar to the fuel supply and fuel transfer system 100, the first predetermined value X1, the second predetermined value X2 and the third predetermined value X3 may also be preset for the fuel supply and fuel transfer system 200. When the amount of fuel in the left wing fuel tank 220 is lower than the first predetermined value X1, the first transfer cut-off valve 215 is opened to start the fuel transfer from the central tank 210 to the left wing fuel collecting tank 222; when the amount of fuel in the left wing fuel collecting tank 222 is greater than or equal to the second predetermined value X2 which is greater than the first predetermined value X1, the first transfer cut-off valve 215 is closed to stop the fuel transfer from the central tank 210 to the left wing fuel collecting tank 222. The control of the fuel transfer of the right wing fuel collecting tank 232 is the same as described above with respect to the left wing fuel collecting tank 222. When the amount of fuel in the central tank 210 is lower than the third predetermined value X3, the first transfer shut-off valve 215 and the second transfer shut-off valve 216 are opened, and the fuel transfer from the central tank 210 to the left wing fuel collecting tank 222 and the right wing fuel collecting tank 232 is continued, and after the amount of fuel in the central tank 210 is zero or close to zero, the transfer process is continued for a preset time, and then the first transfer shut-off valve 215 and the second transfer shut-off valve 216 are closed.

[0182] Further, in the fuel supply and fuel transfer system 200 of the second embodiment, when the first transfer shutoff valve 215 is closed, i.e., the fuel transfer from the central tank 210 to the left wing fuel collecting tank 222 is stopped, the left wing fuel tank transfer pipe shutoff valve 228 on the third transfer pipeline 253 is opened, and the fuel is transferred from the portion of the left wing fuel tank 220 located outside the left wing fuel collecting tank 222 to the inside of the left wing fuel collecting tank 222. Conversely, when the first transfer shutoff valve 215 is opened, the left wing fuel tank transfer pipe shutoff valve 228 is closed.

[0183] Similarly, when the second transfer shutoff valve 216 is closed, that is, the transfer of fuel from the central tank 210 to the right wing fuel collecting tank 232 is stopped, the right wing fuel tank transfer pipe shutoff valve 238 on the fourth transfer pipeline 254 is opened to transfer fuel from the portion of the right wing fuel tank 230 located outside the right wing fuel collecting tank 232 to the inside of the right wing fuel collecting tank 232. Conversely, when the second transfer shutoff valve 216 is opened, the right wing fuel tank transfer pipe shutoff valve 238 is closed.

[0184] The above control process can be realized by a control device such as a computer to realize the closing and opening of each cut-off valve and the setting of specific numerical values ​​of the first predetermined value X1, the second predetermined value X2 and the third predetermined value X3.

[0185] <Third Embodiment>

[0186] Figure 3The fuel supply and fuel transfer system 300 of the third embodiment of the present invention is shown. In the following description of the third embodiment, the technical features of the third embodiment that are different from the first and second embodiments will be mainly described. Unless there is a contrary description in the following content or there is a conflict with other technical features, the features described in the first and second embodiments are also applicable to the third embodiment and will not be described in detail here.

[0187] The fuel supply and fuel transfer system 300 includes a central fuel tank 310 and a left wing fuel tank 320 and a right wing fuel tank 330 located at both sides of the central fuel tank 310 .

[0188] The fuel supply and fuel transfer system 300 includes a first transfer pipeline 351 from the central fuel tank 310 to the left wing fuel tank 320. The first transfer pipeline 351 is provided with a first transfer priming pump 311 for transferring fuel to the left wing fuel tank 320. Specifically, Figure 3 As shown in FIG, the first transfer pipeline 351 extends to the left wing oil collecting tank 322 of the left wing oil tank 320 , and the left wing oil collecting tank 322 is composed of a portion close to the central oil tank 310 separated by the first half sealing rib 321 .

[0189] Preferably, a first transfer check valve 313 is provided in the first transfer pipeline 351, which ensures that the fuel transferred to the left wing oil collecting tank 322 will not flow back. In addition, a first adjustable transfer cut-off valve 315 is further provided in the first transfer pipeline 351, and the opening of the valve is adjustable. The first adjustable transfer cut-off valve 315 can not only control the opening and closing of the fuel transfer from the central tank 310 to the left wing oil collecting tank 322, but also adjust the fuel transfer rate. In this way, the fuel transfer process can be adjusted more flexibly and accurately.

[0190] The first transfusion one-way valve 313 may be disposed upstream or downstream of the first transfusion ejector pump 311 , or one-way valves may be disposed both upstream and downstream of the first transfusion ejector pump 311 .

[0191] Similarly, the oil supply and fuel transfer system 300 is further provided with a second transfer pipeline 352 from the central tank 310 to the right wing tank 330, and the second transfer pipeline 352 includes a second transfer ejector pump 312 for transferring fuel to the right wing tank 330. The second transfer pipeline 352 specifically extends to the right wing oil collecting tank 332 of the right wing tank 330, and the right wing oil collecting tank 332 is composed of a portion close to the central tank 310 separated by the second half sealing rib 331.

[0192] Preferably, a second transfer check valve 314 is provided in the second transfer pipeline 352 to ensure that the fuel transferred to the right wing oil collecting tank 332 will not flow back. A second adjustable transfer cut-off valve 316 is further provided in the second transfer pipeline 352, and its opening is adjustable, so that the second adjustable transfer cut-off valve 316 can control the opening and closing of the fuel transfer from the central tank 310 to the right wing oil collecting tank 332 and adjust the fuel transfer rate.

[0193] The second transfusion check valve 314 may be disposed upstream or downstream of the second transfusion ejector pump 312 , or check valves may be disposed both upstream and downstream of the second transfusion ejector pump 312 .

[0194] <Fourth Embodiment>

[0195] Figure 4 The fuel supply and fuel transfer system 400 of the fourth embodiment of the present invention is shown. In the following description of the fourth embodiment, the technical features of the fourth embodiment that are different from the first to third embodiments will be mainly described. Unless there is a contrary description in the following content or there is a conflict with other technical features, the features described in the first to third embodiments are also applicable to the fourth embodiment and will not be described in detail here.

[0196] The fuel supply and fuel transfer system 400 includes a central fuel tank 410 and a left wing fuel tank 420 and a right wing fuel tank 430 respectively located on both sides of the central fuel tank 410. The first half sealing rib 421 provided in the left wing fuel tank 420 separates a left wing fuel collecting tank 422 close to the central fuel tank 410 in the left wing fuel tank 420, and the second half sealing rib 431 provided in the right wing fuel tank 430 can only separate a right wing fuel collecting tank 432 close to the central fuel tank 410 in the right wing fuel tank 430.

[0197] Different from the previous embodiments, in the fuel supply and fuel transfer system 400 of the fourth embodiment, a first override pump 411 is provided in the central tank 410 for overriding the fuel supply to the left wing engine 441, and a second override pump 412 is also provided in the central tank 410 for overriding the fuel supply to the right wing engine 442.

[0198] During operation of the fuel supply and fuel transfer system 400 of the fourth embodiment, the first override pump 411 and the second override pump 412 perform override fuel supply from the center tank 410 to the left wing engine 441 and the right wing engine 442. In addition, during the taxiing and flight of the aircraft, fuel is transferred from the center tank 410 to the left wing tank 420 and the right wing tank 430, thereby achieving water removal and oil search of the center tank 410.

Claims

1. A fuel supply and fuel transfer system, comprising a central fuel tank and a left wing fuel tank and a right wing fuel tank respectively arranged on both sides of the central fuel tank; It is characterized in that A first transfer pipeline is provided between the left wing fuel tank and the central fuel tank, and a first fuel transfer pump is provided on the first transfer pipeline for transferring fuel from the central fuel tank to the left wing fuel tank; and / or a second transfer pipeline is provided between the right wing fuel tank and the central fuel tank, and a second fuel transfer pump is provided on the second transfer pipeline for transferring fuel from the central fuel tank to the right wing fuel tank; The portion of the left wing fuel tank close to the central fuel tank is formed as a left wing fuel collecting tank, in which at least one left wing fuel tank supply pump is provided for conveying fuel to the left wing engine, and a third transfer pipeline is provided between the left wing fuel collecting tank and the portion of the left wing fuel tank outside the left wing fuel collecting tank, in which a third fuel transfer pump is provided for transferring fuel from the portion of the left wing fuel tank outside the left wing fuel collecting tank to the left wing fuel collecting tank; and / or the portion of the right wing fuel tank close to the central fuel tank is formed as a right wing fuel collecting tank, in which at least one right wing fuel tank supply pump is provided for conveying fuel to the right wing engine, and a fourth transfer pipeline is provided between the right wing fuel collecting tank and the portion of the right wing fuel tank outside the left wing fuel collecting tank, in which a fourth fuel transfer pump is provided for transferring fuel from the portion of the right wing fuel tank outside the right wing fuel collecting tank to the right wing fuel collecting tank; as well as The fuel transfer system further comprises a control device, the control device at least controlling the fuel transfer via the first transfer pipeline, the second transfer pipeline, the third transfer pipeline and the fourth transfer pipeline, wherein the control device is capable of setting a first predetermined value, a second predetermined value and a third predetermined value, the second predetermined value being greater than or equal to the first predetermined value, and the third predetermined value being less than a difference between the maximum fuel capacity of the left wing fuel tank and / or the right wing fuel tank and the first predetermined value; Wherein, the control device is configured as follows: When the fuel amount in the left wing tank is lower than the first predetermined value, the fuel transfer from the central tank to the left wing tank is started, and when the fuel amount in the left wing tank is higher than the second predetermined value, the fuel transfer from the central tank to the left wing tank is closed; and / or when the fuel amount in the right wing tank is lower than the first predetermined value, the fuel transfer from the central tank to the right wing tank is started, and when the fuel amount in the right wing tank is higher than the second predetermined value, the fuel transfer from the central tank to the right wing tank is closed; and When the fuel amount in the center tank is lower than the third predetermined value, the fuel is continuously transferred from the center tank to the left wing tank and / or the right wing tank, and the fuel transfer is continued for a predetermined time after the fuel amount in the center tank becomes zero, and then the fuel transfer to the left wing tank and / or the right wing tank is shut off.

2. The fuel supply and fuel transfer system according to claim 1, It is characterized in that At least one of the first fuel transfer pump, the second fuel transfer pump, the third fuel transfer pump, and the fourth fuel transfer pump is a jet pump.

3. The fuel supply and fuel transfer system according to claim 1, It is characterized in that A first half sealing rib is provided in the left wing oil tank, and a portion of the left wing oil tank at the first half sealing rib close to the central oil tank forms the left wing oil collecting tank; and / or A second half sealing rib is provided in the right wing oil tank, and a portion of the right wing oil tank at the second half sealing rib close to a side of the central oil tank forms the right wing oil collecting tank.

4. The fuel supply and fuel transfer system according to claim 3, It is characterized in that A first transfer check valve is arranged on the first transfer pipeline, and the first transfer check valve is arranged to prevent fuel from flowing back from the left wing fuel tank to the central fuel tank; and / or A second transfer check valve is arranged on the second transfer pipeline, and the second transfer check valve is arranged to prevent the fuel from flowing back from the right wing tank to the central tank; and / or A third transfer one-way valve is arranged on the third transfer pipeline, and the third transfer one-way valve is arranged to prevent the fuel from flowing back from the left wing oil collecting tank; and / or A fourth transfer one-way valve is arranged on the fourth transfer pipeline, and the fourth transfer one-way valve is arranged to prevent the fuel from flowing back from the right wing oil collecting tank.

5. The fuel supply and fuel transfer system as claimed in claim 3, It is characterized in that A first rib one-way valve is provided at the lower part of the first semi-sealed rib, and at least one first hole is provided at the upper part of the first semi-sealed rib; and / or A second rib one-way valve is arranged at the lower part of the second half sealing rib, and at least one second hole is arranged at the upper part of the second half sealing rib.

6. The fuel supply and fuel transfer system as claimed in claim 1, It is characterized in that The dynamic flow used by at least one of the third fuel transfer pump and the fourth fuel transfer pump during operation is an annular jet.

7. The fuel supply and fuel transfer system as claimed in claim 1, It is characterized in that The first transfer pipeline extends from the central fuel tank to the left wing fuel tank or the left wing fuel collecting tank, so that fuel can be transferred from the central fuel tank to the left wing fuel tank or the left wing fuel collecting tank; and / or the second transfer pipeline extends from the central fuel tank to the right wing fuel tank or the right wing fuel collecting tank, so that fuel can be transferred from the central fuel tank to the right wing fuel tank or the right wing fuel collecting tank.

8. The fuel supply and fuel transfer system as claimed in claim 1, It is characterized in that A first transfer shut-off valve is also provided on the first transfer pipeline; and / or a second transfer shut-off valve is also provided on the second transfer pipeline.

9. The fuel supply and fuel transfer system according to claim 8, It is characterized in that The first transfer shut-off valve is a valve with adjustable opening; and / or the second transfer shut-off valve is a valve with adjustable opening.

10. The fuel supply and fuel transfer system according to claim 1, It is characterized in that A left wing fuel tank transfer pipe cut-off valve is also provided on the third transfer pipeline; and / or a right wing fuel tank transfer pipe cut-off valve is also provided on the fourth transfer pipeline.

11. The fuel supply and fuel transfer system as claimed in claim 1, It is characterized in that The central oil tank is also provided with: a first override pump, which is used for over-controlling oil supply to the left wing engine; and / or a second override pump, which is used for over-controlling oil supply to the right wing engine.

12. A method of operating the fuel supply and fuel transfer system according to claim 1, It is characterized in that The method comprises the following steps: Setting the first predetermined value, the second predetermined value, and the third predetermined value; When the fuel amount in the left wing tank is lower than the first predetermined value, the fuel transfer from the central tank to the left wing tank is started, and when the fuel amount in the left wing tank is higher than the second predetermined value, the fuel transfer from the central tank to the left wing tank is closed; and / or when the fuel amount in the right wing tank is lower than the first predetermined value, the fuel transfer from the central tank to the right wing tank is started, and when the fuel amount in the right wing tank is higher than the second predetermined value, the fuel transfer from the central tank to the right wing tank is closed; and When the fuel amount in the center tank is lower than the third predetermined value, the fuel is continuously transferred from the center tank to the left wing tank and / or the right wing tank, and the fuel transfer is continued for a predetermined time after the fuel amount in the center tank becomes zero, and then the fuel transfer to the left wing tank and / or the right wing tank is shut off.

13. The operating method according to claim 12, It is characterized in that The fuel in the central tank is transferred to the left wing collecting tank, and when the fuel transfer from the central tank to the left wing collecting tank is closed, the fuel transfer from the part of the left wing tank outside the left wing collecting tank to the left wing collecting tank is opened; and / or The fuel in the central tank is transferred to the right wing oil collecting tank. When the fuel transfer from the central tank to the right wing oil collecting tank is closed, the fuel transfer from the part of the right wing tank outside the right wing oil collecting tank to the right wing oil collecting tank is opened.

14. The operating method according to claim 12, It is characterized in that Also includes: regulating a fuel transfer rate from said center tank to said left wing tank; and / or Regulating the rate of fuel transfer from the center tank to the starboard tank.

15. The operating method according to claim 12, It is characterized in that Also includes: Override fuel supply from the center tank to the left wing engine; and / or Override fuel supply from the center tank to the right wing engine.

Images