Automatic oil filling device

Abstract

The present invention discloses an automatic oil replenishing device, which relates to the technical field of vehicle oil replenishing devices, and includes a fuel tank assembly and an oil replenishing assembly. The fuel tank assembly includes a main fuel tank, a sub-fuel tank and a connecting pipe, and the two ends of the connecting pipe connect the main fuel tank and the sub-fuel tank. The oil replenishing assembly includes an oil replenishing part and a floating part located inside the main fuel tank. The oil replenishing part is provided with an oil replenishing channel and is connected to the connecting pipe through the oil replenishing channel. One end of the oil replenishing channel is closed and the other end is open. The floating part is slidably connected to the oil replenishing part and can block or open the oil replenishing channel when sliding. When the oil replenishing channel is opened, the fuel in the oil replenishing channel can flow out from its open end. When the oil in the main fuel tank is insufficient, the fuel liquid level inside the main fuel tank drops, the floating part drops to open the oil replenishing channel, and the fuel in the sub-fuel tank flows into the oil replenishing channel through the connecting pipe, and then flows into the main fuel tank. The oil replenishing of the present invention does not require the provision of electronic components such as a control mechanism and an oil quantity sensor, which not only saves costs, but also has a low failure frequency.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle oil replenishing devices, and in particular to an automatic oil replenishing device. Background Art

[0002] Off-road vehicles usually travel in the wild and consume a lot of fuel. In order to further improve the endurance requirements of off-road vehicles and increase the fuel storage capacity of off-road vehicles, it is necessary to utilize the scattered chassis space of the off-road vehicle to arrange additional fuel tanks. When the fuel level in the main tank is insufficient, the main tank can be refilled in time.

[0003] The prior art with announcement number CN216157740U discloses an automatic oil replenishing device, an engine system and a vehicle, the device includes an oil replenishing tank, an oil pan, an oil level sensor and a control mechanism; the oil replenishing tank is connected to the oil pan; the oil level sensor is used to detect the amount of oil in the oil pan; the oil level sensor is connected to the control mechanism by signal; when the control mechanism determines that the oil pan is in an insufficient oil state, the control mechanism is used to transfer the oil in the oil replenishing tank to the oil pan to make the oil pan in a sufficient oil state. When the vehicle is powered on, the oil level sensor detects the oil level state of the oil pan, and determines the oil level state of the oil pan through the control mechanism. If the oil pan is in an insufficient oil state, the control mechanism transfers the oil in the oil replenishing tank to the oil pan until the oil pan is in a sufficient oil state.

[0004] However, the existing oil replenishing device still has some shortcomings. For example, it controls the oil replenishment through the electrical sensor signal between the control mechanism and the oil level sensor, which requires the configuration of expensive electronic components such as the control mechanism and the oil level sensor. In addition, the electronic components have a short service life, are prone to failure, and have high maintenance and replacement costs. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose an automatic oil replenishing device to solve the technical problems in the prior art that the electronic components for controlling oil tank replenishing are high in cost, short in service life and prone to failure.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides an automatic oil replenishing device, comprising: A fuel tank assembly, comprising a main fuel tank, a subsidiary fuel tank and a connecting pipe, wherein both ends of the connecting pipe are connected to the main fuel tank and the subsidiary fuel tank; and An oil replenishing assembly comprises an oil replenishing member and a floating member located inside the main oil tank, the oil replenishing member is provided with an oil replenishing passage and is connected to the connecting pipe through the oil replenishing passage, one end of the oil replenishing passage is closed and the other end is open, the floating member is slidably connected to the oil replenishing member and can block or open the oil replenishing passage when sliding; when the oil replenishing passage is opened, the fuel in the oil replenishing passage can flow out from its open end.

[0007] In some embodiments, the floating member includes a float and an oil valve connected to each other, the oil valve is slidably connected to the oil replenishing member, and the float can drive the oil valve to slide back and forth relative to the oil replenishing member when the fuel level inside the main fuel tank changes.

[0008] In some embodiments, the inner wall of the oil replenishment channel has a tapered groove, the end of the oil valve is tapered, and the tapered end of the oil valve can completely fit in the tapered groove when the oil valve slides.

[0009] In some embodiments, the oil replenishing assembly further includes a magnetic component, which is disposed on the oil replenishing component and can be magnetically attracted to the oil valve when the oil valve approaches, and the float can drive the oil valve to separate from the magnetic component by its own gravity.

[0010] In some embodiments, the floating member further includes an elastic member, both ends of which are connected to the float and the oil valve, and when the oil valve rises, the elastic force of the elastic member can drive the oil valve to slide and block the oil replenishment channel.

[0011] In some embodiments, the oil replenishing member has a convex ring, the convex ring has an extension channel, the extension channel is connected to the oil replenishing channel to form a slide groove together, the oil valve is slidably arranged in the slide groove and can slide back and forth in the slide groove to block or open the oil replenishing channel.

[0012] In some embodiments, the connecting pipe is connected to the bottom position of the auxiliary oil tank.

[0013] In some embodiments, the oil replenishing assembly further comprises a filter cartridge disposed inside the main oil tank, the filter cartridge is provided with a plurality of filter holes along its circumference, and the oil replenishing member and the floating member are both located inside the filter cartridge.

[0014] In some embodiments, the fuel tank assembly further includes a filling pipe and a vent pipe, one end of the filling pipe and the vent pipe are both connected to the auxiliary fuel tank, and the other end of the vent pipe is connected to the filling pipe.

[0015] In some embodiments, the number of the auxiliary fuel tanks and the number of the connecting pipes are both multiple, and the adjacent auxiliary fuel tanks are connected by the connecting pipes. The number of the ventilation pipe is one, and the ventilation pipe is arranged on the auxiliary fuel tank farthest from the main fuel tank.

[0016] Compared with the prior art, the automatic oil replenishing device provided by the present invention has a main oil tank that can be used to connect to the engine of the vehicle so as to provide a power source for the vehicle. When the oil level in the main oil tank is insufficient, the fuel level inside the main oil tank drops, the floating part slides and drops relative to the oil replenishing part, the floating part opens the oil replenishing channel, and the fuel in the auxiliary oil tank flows into the oil replenishing channel through the connecting pipe, and then flows into the main oil tank from the outlet end of the oil replenishing channel. When the fuel level inside the main oil tank gradually rises, the floating part slides and rises relative to the oil replenishing part until the oil replenishing channel is blocked. It can be seen that the oil replenishment of the present invention does not require the setting of electronic components such as control mechanisms and oil quantity sensors, which not only saves costs but also has a low failure frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an automatic oil replenishing device according to an embodiment of the present invention; Figure 2 is a schematic diagram of the internal structure of a main oil tank provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of the oil valve provided by an embodiment of the present invention when the oil replenishment channel is fully opened; Figure 4 is a schematic structural diagram of the oil valve provided by an embodiment of the present invention when the oil replenishment channel is completely blocked; Figure 5 is a schematic structural diagram of the oil valve provided by an embodiment of the present invention when the oil replenishment channel is half-opened; Figure 6 It is a structural schematic diagram of an automatic oil replenishing device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problems in the prior art that electronic components for controlling fuel tank refilling are high in cost, short in service life, and prone to failure, the present invention provides an automatic refueling device that can realize automatic control of vehicle fuel tank refilling through a mechanical structure, without the need to set up electronic components such as a control mechanism and a fuel level sensor, which not only saves costs but also reduces the frequency of failures.

[0020] It should be noted that the automatic oil filling device described in the present invention is used for but not limited to off-road vehicles, etc. For the convenience of explanation, in the present invention, only the application of the automatic oil filling device to an off-road vehicle is used as an example for explanation, and the principle of the automatic oil filling device being applied to other types of equipment is essentially the same as that applied to an off-road vehicle, and will not be described in detail here.

[0021] See also Figure 1 , Figure 1 The structure diagram of the automatic oil filling device in one embodiment of the present invention is shown in FIG. The automatic oil filling device includes a fuel tank assembly and a fuel filling assembly. The fuel tank assembly includes a main fuel tank 1, an auxiliary fuel tank 2 and a connecting pipe 3. The two ends of the connecting pipe 3 connect the main fuel tank 1 and the auxiliary fuel tank 2. The main fuel tank 1 is used to connect to the engine of the off-road vehicle to supply fuel to the engine. The auxiliary fuel tank 2 is used to store spare fuel. When the fuel in the main fuel tank 1 is insufficient, the auxiliary fuel tank 2 can replenish the main fuel tank 1 through the connecting pipe 3 to improve the endurance of the off-road vehicle.

[0022] The oil replenishing assembly is arranged at the main fuel tank 1. When the fuel in the main fuel tank 1 is insufficient, the oil replenishing assembly can automatically control the auxiliary fuel tank 2 to replenish the main fuel tank 1. When the fuel in the main fuel tank 1 is sufficient, the oil replenishing assembly controls the auxiliary fuel tank 2 to stop replenishing the main fuel tank 1. The oil replenishing assembly includes an oil replenishing part 4 and a floating part 5 located inside the main fuel tank 1. The oil replenishing part 4 is provided with an oil replenishing channel 41 and is connected to the connecting pipe 3 through the oil replenishing channel 41. One end of the oil replenishing channel 41 is closed and the other end is open. The floating part 5 is slidably connected to the oil replenishing part 4 and can block or open the oil replenishing channel 41 when sliding. When the oil replenishing channel 41 is opened, the fuel in the oil replenishing channel 41 can flow out from its open end and enter the main fuel tank 1 to replenish the main fuel tank 1.

[0023] In one embodiment, see Figure 3, the floating member 5 includes a connected float 51 and an oil valve 52, the oil valve 52 is slidably connected to the oil replenishing member 4, and the float 51 can drive the oil valve 52 to slide back and forth relative to the oil replenishing member 4 when the fuel liquid level inside the main fuel tank 1 changes. In this embodiment, the density of the float 51 is less than the density of the fuel, and it can float on the liquid surface of the fuel and rise and fall with the rise and fall of the fuel liquid level. Since the float 51 is connected to the oil valve 52, the float 51 can drive the oil valve 52 to slide relative to the oil replenishing member 4 when rising and falling, so as to achieve synchronous rising and falling. When the oil valve 52 rises to the top, the oil valve 52 can block the oil replenishing channel 41, and no fuel will flow out from the open end of the oil replenishing channel 41 at this time, and the replenishment of the main fuel tank 1 is suspended. When the oil valve 52 descends, the oil valve 52 can open a part of the oil replenishing channel 41 or all of the oil replenishing channel 41. When the amount of oil in the main tank 1 is less, the liquid level of the fuel inside the main tank 1 is lower, the position of the float 51 is lower, the float 51 drives the oil valve 52 to slide downward, the position of the oil valve 5 is also lower, the area of ​​the oil valve 52 opening the oil replenishment channel 41 is larger, and the oil replenishment speed of the oil replenishment channel 41 to the main tank 1 is faster. As the amount of fuel inside the main tank 1 gradually increases, the float 51 gradually rises, driving the oil valve 52 to gradually rise to reduce the unblocked area of ​​the oil replenishment channel 52, gradually reducing the amount of oil flowing through the oil replenishment channel 52, and reducing the oil replenishment speed to the main tank 1. It can be seen that this embodiment can automatically control the float 51 and the oil valve 52 to adjust the amount of oil flowing through the oil replenishment channel 41 according to the amount of fuel inside the main tank 1, thereby controlling the oil replenishment speed to the main tank 1, without the need to set up electronic components such as oil amount sensors, which not only saves costs, but also has a low failure frequency.

[0024] In one embodiment, see Figure 4 and Figure 5 The inner wall of the oil replenishment channel 41 has a tapered groove 42, and the end of the oil valve 52 is tapered. The tapered end of the oil valve 52 can be completely fitted with the tapered groove 42 when the oil valve 52 rises and slides. In this embodiment, the contact portion of the oil valve 52 and the oil replenishment channel 41 is set to be tapered, which can increase the contact area between the oil valve 52 and the oil replenishment channel 41, so as to improve the sealing performance of the oil valve 52 and the oil replenishment channel 41, and avoid oil leakage when oil replenishment is not needed.

[0025] Furthermore, the oil replenishing assembly also includes a magnetic member 43, which is arranged on the oil replenishing member 4, and can be specifically arranged on the groove wall of the tapered groove 42 or embedded in the inside of the oil replenishing member 4. The magnetic member 43 can be magnetically attracted to the oil valve 52 when the oil valve 43 is close, so that the sealing connection between the tapered end of the oil valve 43 and the tapered groove 42 of the oil replenishing channel 41 is tighter, which is conducive to enhancing the sealing of the oil replenishing channel 41. The float 51 can drive the oil valve 52 to separate from the magnetic member 43 by its own gravity. The gravity of the float 51 is greater than the magnetic attraction of the magnetic member 43 to the oil valve 52. Therefore, when the liquid level of the fuel drops to a certain extent, the float 51 can drive the oil valve 52 to separate from the oil replenishing channel 41 to open the oil replenishing channel 41 and replenish the main fuel tank 1. Compared with the previous embodiment, this embodiment can drive the oil valve 52 to separate from the oil replenishing channel 41 when the fuel liquid level in the main fuel tank 1 drops further. In addition, when the fuel level rises, the tapered end of the oil valve 52 can seal the tapered groove 42 connected to the oil replenishing passage 41 in advance through magnetic attraction.

[0026] In one embodiment, see Figure 4 and Figure 5 The oil valve 52 is made of metal material so that the oil valve 52 can be magnetically connected to the magnetic element 43, or a magnetic sheet is provided on the surface of the oil valve 52, which can be magnetically connected to the magnetic element 43 through the magnetic sheet, so that the oil valve 52 is sealed and connected to the conical groove 42.

[0027] In one embodiment, see Figure 5 and Figure 6, the floating member 5 also includes an elastic member 53, the two ends of the elastic member 53 are connected to the float 51 and the oil valve 52, and the oil valve 52 can be driven by the elastic force of the elastic member 53 to slide and block the oil replenishment channel 41 when the oil valve 52 rises. In this embodiment, the above-mentioned magnetic attraction member 43 is not provided, and the oil valve 52 is not magnetically connected to the conical groove 42 when it is close to the oil replenishment channel 41. In this embodiment, a secondary pipe 6 is also connected between the main oil tank 1 and the auxiliary oil tank 2. The secondary pipe 6 has a switch valve 61, and the switch valve 61 can be switched between an open state and a closed state. When the switch valve 61 is opened, the fuel in the main oil tank 1 can flow into the auxiliary oil tank 2 through the secondary pipe 6. When the switch valve 61 is closed, the secondary pipe 6 cannot circulate fuel. When the fuel liquid level in the main oil tank 1 rises, the oil valve 52 rises until it abuts the conical groove 42. At this time, the switch valve 61 is opened again to allow a portion of the fuel in the main tank 1 to continue to flow into the auxiliary tank 2 (the amount of fuel can be set by experiment), driving the float 51 to continue to rise, and the float 51 compresses the elastic member 53 to accumulate elastic force. The elastic member 53 drives the oil valve 52 to abut the tapered groove 42 more closely through the elastic force, which is conducive to further improving the sealing performance of the oil valve 52 and the tapered groove 42. After a certain amount of fuel is input through the auxiliary pipe 6, the switch valve 61 is closed. The switch valve 61 of this embodiment can be a manually controlled valve structure or a solenoid valve. The driver can control the solenoid valve to open or close in the cab, which is easy to operate.

[0028] In one embodiment, see Figure 5 The oil replenishing member 4 has a convex ring 44, and the convex ring 44 has an extension channel 45. The extension channel 45 is connected to the oil replenishing channel 41 to form a slide groove together. The oil valve 52 is slidably arranged in the slide groove and can slide back and forth in the slide groove to block or open the oil replenishing channel 41. In this embodiment, by providing the convex ring 44, the sliding distance of the oil valve 52 can be extended to prevent the oil valve 52 from being separated from the oil replenishing member 4 when it is at the lowest position and failing to slide stably.

[0029] In one embodiment, see Figure 2 The connecting pipe 3 is connected to the bottom of the auxiliary fuel tank 2 so that the fuel at the bottom of the auxiliary fuel tank 2 can flow into the main fuel tank 1 through the connecting pipe 3. The fuel output of the auxiliary fuel tank 2 is complete, the residual fuel is small, and fuel is saved.

[0030] In one embodiment, see Figure 3The oil replenishment assembly also includes a filter cartridge 11 disposed inside the main oil tank 1. The filter cartridge 11 is provided with a plurality of filter holes 12 along its circumference. The oil replenishment member 4 and the floating member 5 are both located inside the filter cartridge 11. In this embodiment, the fuel output from the oil replenishment channel 41 is first filtered by the filter cartridge 11 to block impurities in the filter cartridge 11, and the fuel then flows into the main oil tank 1, thereby preventing impurities from entering the engine along with the fuel. The filter cartridge 11 can be installed on the inner wall of the main oil tank 1 by screws, wherein the top of the filter cartridge 11 is exposed on the surface of the main oil tank 1, and the connecting pipe 3 extends from the top of the filter cartridge 11 into the oil replenishment channel 41.

[0031] In one embodiment, see Figure 1 , the fuel tank assembly also includes a refueling pipe 7 and a vent pipe 8, one end of the refueling pipe 7 and the vent pipe 8 are both connected to the auxiliary fuel tank 2, and the other end of the vent pipe 8 is connected to the refueling pipe 7. In this embodiment, the free end of the refueling pipe 7 can be used to connect to a refueling source to refuel the auxiliary fuel tank 2. The refueling source can be a refueling pump at a gas station. During the process of refueling the refueling pipe 7, as the fuel in the auxiliary fuel tank 2 gradually increases, the fuel will drive the air inside the auxiliary fuel tank 2 to be discharged through the vent pipe 8 to avoid the fuel from being unable to enter the auxiliary fuel tank 2 due to air pressure. The vent pipe 8 is connected to the refueling pipe 7, and the density of the fuel is greater than the density of the air, so that the auxiliary fuel tank 2 can be vented during the refueling process. In addition, the vent pipe 8 is connected to the connecting pipe 7, which is also convenient for the arrangement of the pipeline.

[0032] In one embodiment, the number of the auxiliary tanks 2 and the number of the connecting pipes 3 are both multiple, and the adjacent auxiliary tanks 2 are connected by the connecting pipes 3. The number of the vent pipe 8 is one, and the vent pipe 8 is arranged on the auxiliary tank 2 farthest from the main tank 1. In this embodiment, the number of the auxiliary tanks 2 is multiple, and each auxiliary tank 2 can store a certain amount of fuel. Compared with the above embodiment, this embodiment can reserve more fuel and replenish more fuel for the main tank 1, thereby enhancing the endurance of the off-road vehicle. Since the auxiliary tanks 2 and the main tank 1 and the auxiliary tanks 2 are connected by the connecting pipe 3, only one vent pipe 8 is needed. The vent pipe 8 is arranged on the auxiliary tank 2 farthest from the main tank 1, which can also make all the auxiliary tanks 2 connected to the atmosphere, and the fuel in all the auxiliary tanks 2 can flow into the main tank 1 by gravity. It should be emphasized that the heights of the multiple auxiliary fuel tanks 2 need to be increased in sequence, and the position of the auxiliary fuel tank 2 farther away from the main fuel tank 1 is higher, so that the fuel in the auxiliary fuel tank 2 can flow to the main fuel tank 1 by gravity. In addition, the number of refueling pipes 7 can be set to one, and the refueling pipe 7 is set on the auxiliary fuel tank 2 farthest from the main fuel tank 1. When refueling the refueling pipe 7, the fuel can flow into each auxiliary fuel tank 2 in sequence by gravity. The refueling pipe 7 can also be set to multiple, for example, a refueling pipe 7 can be set on each auxiliary fuel tank 2 to refuel each auxiliary fuel tank 2 separately.

[0033] In one embodiment, see Figure 2 An oil suction member 9 is vertically arranged inside the main fuel tank 1, one end of the oil suction member 9 passes directly through the bottom of the main fuel tank 1 to fully suck the fuel inside the main fuel tank 1, and the other end of the oil suction member 9 is located on the surface of the main fuel tank 1, which is used to connect to the engine of the off-road vehicle to supply fuel to the engine.

[0034] In order to better understand the present invention, the following Figures 1 to 6 The technical solution of the present invention is described in detail: The main fuel tank 1 of the automatic fuel replenishing device provided by the present invention can be used to connect to the engine of the vehicle so as to provide a power source for the vehicle. When the fuel volume of the main fuel tank 1 is insufficient, the fuel liquid level inside the main fuel tank 1 drops, the floating part 5 slides and drops relative to the fuel replenishing part 4, the floating part 5 opens the fuel replenishing channel 41, and the fuel of the auxiliary fuel tank 2 flows into the fuel replenishing channel 41 through the connecting pipe 3, and then flows into the main fuel tank 1 from the outlet end of the fuel replenishing channel 41. When the fuel liquid level inside the main fuel tank 1 gradually rises, the floating part 5 slides and rises relative to the fuel replenishing part 4 until the fuel replenishing channel 41 is blocked. It can be seen that the fuel replenishment of the present invention does not require the setting of electronic components such as control mechanisms and fuel quantity sensors, which not only saves costs but also has a low failure frequency.

[0035] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An automatic oil replenishing device, characterized in that: include: A fuel tank assembly, comprising a main fuel tank, a subsidiary fuel tank and a connecting pipe, wherein two ends of the connecting pipe are connected to the main fuel tank and the subsidiary fuel tank; and An oil replenishing assembly comprises an oil replenishing member and a floating member located inside the main oil tank, the oil replenishing member is provided with an oil replenishing passage and is connected to the connecting pipe through the oil replenishing passage, one end of the oil replenishing passage is closed and the other end is open, the floating member is slidably connected to the oil replenishing member and can block or open the oil replenishing passage when sliding; when the oil replenishing passage is opened, the fuel in the oil replenishing passage can flow out from its open end.

2. The automatic oil replenishing device according to claim 1, characterized in that: The floating member includes a connected float and an oil valve, the oil valve is slidably connected to the oil replenishing member, and the float can drive the oil valve to slide back and forth relative to the oil replenishing member when the fuel liquid level inside the main oil tank changes.

3. The automatic oil replenishing device according to claim 2, characterized in that: The inner wall of the oil replenishment channel has a tapered groove, the end of the oil valve is tapered, and the tapered end of the oil valve can be completely fitted with the tapered groove when the oil valve slides.

4. The automatic oil replenishing device according to claim 3, characterized in that: The oil replenishing assembly further comprises a magnetic member, which is arranged on the oil replenishing member and can be magnetically attracted to the oil valve when the oil valve approaches, and the float can drive the oil valve to separate from the magnetic member by its own gravity.

5. The automatic oil replenishing device according to claim 2, characterized in that: The floating member further comprises an elastic member, two ends of which are connected to the float and the oil valve. When the oil valve rises, the elastic force of the elastic member can drive the oil valve to slide and block the oil replenishment channel.

6. The automatic oil replenishing device according to claim 2, characterized in that: The oil replenishing member has a convex ring, and the convex ring has an extension channel. The extension channel is connected to the oil replenishing channel to form a slide groove together. The oil valve is slidably arranged in the slide groove and can slide back and forth in the slide groove to block or open the oil replenishing channel.

7. The automatic oil replenishing device according to claim 1, characterized in that: The connecting pipe is connected to the bottom of the auxiliary oil tank.

8. The automatic oil replenishing device according to claim 1, characterized in that: The oil replenishing assembly also includes a filter cartridge arranged inside the main oil tank. The filter cartridge is provided with a plurality of filter holes along its circumference. The oil replenishing member and the floating member are both located inside the filter cartridge.

9. The automatic oil replenishing device according to claim 1, characterized in that: The fuel tank assembly also includes a filling pipe and a vent pipe. One end of the filling pipe and the vent pipe are both connected to the auxiliary fuel tank, and the other end of the vent pipe is connected to the filling pipe.

10. The automatic oil replenishing device according to claim 9, characterized in that: The number of the auxiliary fuel tanks and the number of the connecting pipes are both multiple, and the adjacent auxiliary fuel tanks are connected by the connecting pipes. The number of the ventilation pipe is one, and the ventilation pipe is arranged on the auxiliary fuel tank farthest from the main fuel tank.

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