CN107336838B

CN107336838B - Unmanned aerial vehicle oil tank

Info

Publication number: CN107336838B
Application number: CN201710704363.7A
Authority: CN
Inventors: 宫瑞君
Original assignee: Shaoxing Baojing Composite Material Co ltd
Current assignee: Shaoxing Baojing Composite Material Co ltd
Priority date: 2017-08-17
Filing date: 2017-08-17
Publication date: 2023-11-14
Anticipated expiration: 2037-08-17
Also published as: CN107336838A

Abstract

The application relates to an oil tank for an unmanned aerial vehicle, wherein an oil filling port is positioned at the left upper part of the oil tank; the vent is positioned at the top of the oil tank and is communicated with the atmosphere through the vent pipe and the three-way adapter; the oil delivery port is positioned at the bottom of the oil tank and is communicated with each oil tank through an oil delivery pipe; the fuel supply port is positioned at the bottom of the fuel tank and supplies fuel to the engine through the fuel filter and the fuel pump; the oil return port is positioned at the rear upper part of the oil tank and is used for recovering the residual fuel oil of the engine; the oil mass measuring port is positioned at the middle upper part of the oil tank; the oil drain port is positioned at the middle lower part of the oil tank and is used for installing an oil drain switch; the lifting lug is positioned around the oil tank, the weight reduction effect is obvious, the unmanned aerial vehicle with the same engine power has larger effective load, the unmanned aerial vehicle is important for the usability of the unmanned aerial vehicle, the fight unmanned aerial vehicle can carry more weapons or fuel oil, the agricultural unmanned aerial vehicle can carry more pesticides or seeds, and the aerial mapping unmanned aerial vehicle can carry more fuel oil and the like.

Description

Unmanned aerial vehicle oil tank

Technical Field

The application relates to the technical field of aerospace, in particular to an oil tank for an unmanned aerial vehicle.

Background

The development and use of unmanned aerial vehicles has been over 90 years old since the 30 s of the 20 th century. After the germination period and the incubation period of the 20 th century are long, the unmanned aerial vehicle is expected to come to be in high speed in the beginning of the 21 st century, and gradually expands from the military field to the civil field. Today, civilian unmanned aerial vehicles have been widely used in a number of fields such as emergency rescue, environmental detection, power line inspection, aerial mapping, parcel dispatch, agricultural plant protection, and the like. The global second major market research consultation company Marketsand Markets believes that the global unmanned aerial vehicle market size in 2020 will reach 19 million dollars; the market Research institute ABI Research predicts that by 2019, the commercial unmanned aerial vehicle market size will reach $51 billion; lux Research indicates that commercial drone market size will reach $ 17 billion in 2025.

The units engaged in the unmanned aerial vehicle industry in China are more than 300, wherein the size of the units is about 160 for larger enterprises, and a complete research, development, manufacturing, sales and service system is formed. At present, hundreds of unmanned aerial vehicles are researched and used, the technology of the small unmanned aerial vehicle is mature gradually, the strategic unmanned aerial vehicle is tried on, and the attack unmanned aerial vehicle is also tried on an air-ground missile for many times. With the development of unmanned aerial vehicles, especially the high-speed development of civil unmanned aerial vehicles, people pay more attention to the cost, development period, performance and the like of unmanned aerial vehicles, more clients can be won only by products with high cost performance, and technological progress can be kept up only by short development period. In unmanned aerial vehicles, fuel is one of the necessary and important components, and its weight, sealing, cost, manufacturing cycle, etc. have an important impact on unmanned aerial vehicles.

In the existing unmanned aerial vehicle oil tank, the weight and sealing, the cost and the development period cannot be considered both as an integral oil tank and a split oil tank. The integral oil tank has the weight reduction effect, but has poor sealing performance, is easy to leak, has difficult detection of the position of a leak point, and severely restricts the use and maintenance of the unmanned aerial vehicle; the split oil tank is heavy, and especially the hard oil tank therein greatly increases the weight of the unmanned aerial vehicle, and although the traditional soft oil tank plays a certain role in weight reduction, the manufacturing period is longer, the installation is complex, and the weight reduction effect is general.

Based on this, the present application has been made.

Disclosure of Invention

The application aims to overcome the defects of the prior art and provides an oil tank for an unmanned aerial vehicle. In order to overcome the defects of the existing oil tank, the application provides the polyurethane elastomer rubber oil tank for the unmanned aerial vehicle, which has the advantages of light weight, good sealing, simple installation and fixation and short development period. Compared with the traditional integral oil tank for the unmanned aerial vehicle, the sealing performance is greatly improved, and the maintenance and the replacement are simple and convenient; compared with the traditional split oil tank for the unmanned aerial vehicle, the split oil tank for the unmanned aerial vehicle has lighter weight, lower cost, shorter development period and simpler installation and fixation.

The aim of the application is realized by the following technical scheme:

an oil tank for an unmanned aerial vehicle comprises an oil tank shell, an oil filler, an air vent pipe, a three-way adapter, an oil delivery port, an oil delivery pipe, an oil delivery port, an oil return port, an oil quantity measuring port, an oil discharge port and a lifting lug;

the oil filling port is positioned at the left upper part of the oil tank, is suitable for gravity oil filling, and can be used for oil filling by using oil filling guns (a six-part gun, a one-inch gun and a one-inch and one-half gun) in an external field; the vent is positioned at the top of the oil tank and is communicated with the atmosphere through the vent pipe and the three-way adapter; the oil delivery port is positioned at the bottom of the oil tank and is communicated with each oil tank through an oil delivery pipe; the fuel supply port is positioned at the bottom of the fuel tank and supplies fuel to the engine through the fuel filter and the fuel pump; the oil return port is positioned at the rear upper part of the oil tank and is used for recovering the residual fuel oil of the engine; the oil quantity measuring port is positioned at the middle upper part of the oil tank and is used for installing an oil quantity sensor and measuring the residual oil quantity of the oil tank; the oil drain port is positioned at the middle lower part of the oil tank and is used for installing an oil drain switch, so that residual fuel oil and sediment can be released; the lifting lug is located around the oil tank and used for installing and fixing the oil tank.

Further, as preferable:

the oil tank shell divide into 1# oil tank shell, 2# oil tank shell, 3# oil tank shell, 4# oil tank shell, with oil tank shell split, separate through body structure between the oil tank branch shells, body structure can be as the lateral wall board of oil tank shell, can make the oil tank shell satisfy the intensity requirement, can also reduce the surge phenomenon of fuel. More preferably, the 4# oil tank shell is divided into an upper part and a lower part, the lower part can be used as a consumption oil tank, the consumption oil tank can be communicated with other oil tank shells through an oil delivery port, fuel oil and sediment can be released through an oil discharge port, and the fuel oil is supplied to an engine through the oil supply port, so that unavailable fuel oil in the oil tank can be reduced, and the fuel oil utilization rate is improved.

The oil filler is integrally formed with the 1# oil tank shell, so that connection is simplified, and sealing is facilitated. More preferably, the aluminum alloy oil filler insert with a rolling slope is embedded in the oil filler, so that the connection strength and the sealing performance of the oil filler are improved, and the grounding is convenient during oil filling; the outer side of the oil filler is clamped by a stainless steel clamping belt, so that the sealing is further enhanced; the oil filler is far left, so that the oil filling distance is shortened, and the oil filling of personnel is facilitated.

The three air vents can be respectively integrally formed with the 1# oil tank shell, the 2# oil tank shell and the 3# oil tank shell, and are connected with the air inlet on the engine body skin through a plurality of air pipes and two three-way connectors to maintain the internal pressure of the oil tank. More preferably, the height of the air vent is not less than 36mm, and the air vent is positioned in the plane of symmetry of the aircraft (which can be calculated according to the maximum pitching angle of the unmanned aerial vehicle) so as to prevent the fuel from flowing out of the air vent under various flight attitudes of the unmanned aerial vehicle.

The ventilation pipe and the oil delivery pipe adopt PU or TPU pipes with standard specifications, so that the manufacturing period can be shortened, the cost can be reduced, and the weight can be reduced.

The tee joint adapter adopts a standard component made of brass, so that the manufacturing period can be shortened, the cost can be reduced, and the weight can be reduced.

The oil delivery port and the oil tank shell are integrally formed and are respectively arranged at the front, the back, the left and the right of the lower part of the oil tank, so that the unmanned aerial vehicle is favorable for delivering oil to the consumed oil tank under various flight attitudes, and the consumed oil tank is lack of fuel and cannot be supplied to an engine to cause irrecoverable loss when in extreme flight attitudes.

The oil supply port and the consumption oil tank are integrally formed and are divided into a left part and a right part, so that the unmanned aerial vehicle is beneficial to supplying oil to the engine under various flight attitudes.

The oil return port and the No. 3 oil tank are integrally formed and are positioned above the rear of the oil tank and close to the engine, so that the oil return distance is shortened.

The air vent, the oil conveying port, the oil supply port and the oil return port can be internally embedded with an aluminum alloy adapter with a rolling slope for enhancing the connection and sealing effect, and the outer side of the aluminum alloy adapter is clamped by a clamp.

The oil quantity measuring port and the oil discharging port, the oil quantity sensor and the oil discharging switch are connected with the oil tank shell through an aluminum alloy installation boss and a rubber sealing ring which are arranged at corresponding positions inside the oil tank shell. More preferably, the outer side wall plate (part of the machine body structure) of the oil tank shell can be placed between the oil quantity sensor, the oil drain switch and the oil tank shell, so that the connection and fixation of the oil quantity sensor and the oil drain switch are further enhanced.

The lifting lug and the oil tank shell are integrally formed and are connected with the engine body through the binding rope to play a role in supporting and fixing. More preferably, when the unmanned aerial vehicle has small load and small maneuver, the oil tank shell and the engine body can be fixed by using the magic tape instead of the lifting lug.

The working principle of the application is as follows: the oil tank passes through the lug all around of oil tank casing and links to each other with the organism, leans on the wallboard support oil tank in the oil tank casing outside, and when unmanned aerial vehicle maneuver flies, the fluid that rocks will force transfer oil tank casing, then gives the wallboard by the casing again, disperses the organism with force by the wallboard at last. When the unmanned aerial vehicle refuels, operating personnel firstly grounds the aluminum alloy embedded part of the oil filling port, and uses an oil gun or an oil pipe to refuel the oil in the oil tank through the oil filling port. When the unmanned aerial vehicle flies, the atmosphere enters the oil tank through the air vent, and the internal pressure of the oil tank is maintained to be stable; the oil delivery port delivers the fuel oil of each oil tank to the consumption oil tank; the fuel pump pumps the fuel from the fuel supply port, so that the fuel is filtered by the fuel, pumped by the fuel pump and supplied to the engine through the fuel supply pipe, and power is provided for the unmanned aerial vehicle to fly; the oil return port returns the residual fuel oil of the engine to the oil tank, so that the fuel oil is saved; the oil quantity sensor senses and calculates the residual oil quantity of the oil tank through the oil quantity measuring port, the data are transmitted to the airborne computer, the airborne computer processes the data and then transmits signals to the ground station through the antenna, the ground station calculates the residual flight time and the like, and oil-free accidents are prevented. When the unmanned aerial vehicle discharges oil, operating personnel discharges the oil tank with surplus fuel and sediment through the oil switch that discharges.

Compared with the prior art, the application has the following positive effects:

(1) The application has obvious weight reducing effect. Compared with a hard oil tank (aluminum alloy), the weight of the unmanned aerial vehicle is reduced by more than 80 percent, compared with a soft oil tank by more than 40 percent, the unmanned aerial vehicle with the same engine power has larger effective load, which is important for the usability of the unmanned aerial vehicle, the fighter unmanned aerial vehicle can carry more weapons or fuel oil, the agricultural unmanned aerial vehicle can carry more pesticides or seeds, the aerial mapping unmanned aerial vehicle can carry more fuel oil and the like

(2) The application has good sealing effect and is easy to fix, maintain and replace. According to the application, various connectors are integrally formed with the oil tank shell, the addictive cooperation between the connectors and the pipelines is realized through the embedded metal adapter and the clamp, and the sealing performance is far better than that of an integral oil tank and a welded split oil tank; the application is connected with the machine body through the lifting lug, thereby being convenient for fixing, maintaining, disassembling, assembling and replacing.

(3) The application has low cost and short development period. The fuel tank material is cheap, the manufacturing is simple, the construction period is short, the mass production can be realized, the special-shaped fuel tank can be manufactured by using the material, and the use requirements of various aircrafts can be met.

The oil tank made of polyurethane elastomer rubber is attractive, light in weight, good in sealing performance, easy to fix, maintain and replace, low in cost and short in development period, can be used as a special-shaped oil tank, and can meet the air tightness, pressure and strength tests.

Drawings

FIG. 1 is an isometric view of the present application;

FIG. 2 is a bottom view of the present application;

FIG. 3 is a partial view of a fuel filler port of the present application;

FIG. 4 is a cross-sectional view of a vent of the present application (oil transfer port, oil supply port, and oil return port are similar);

fig. 5 is a sectional view of the oil quantity measuring port of the present application (the oil discharge switch is installed in a similar manner).

Reference numerals in the drawings:

fig. 1 and 2 are numbered as follows: 1# oil tank case; 2.2# tank case; 3.3# tank housing; 4.4# tank case; 5. a fuel filler; 6. a vent; 7. a three-way adapter; 8. an oil quantity measuring port; 9. a vent pipe; 10. an oil return port; 11. lifting lugs; 12. an oil delivery pipe; 13. an oil delivery port; 14. an oil drain port; 15. and an oil supply port.

Fig. 3 is numbered as follows: 5-1, oiling cover; 5-2, an aluminum alloy oil filler insert with a rolling slope; 5-3, a fuel filler (integrally formed with the 1# fuel tank shell); and 5-4, stainless steel clamping bands.

Fig. 4 is numbered as follows: 6-1, an aluminum alloy adapter with a rolling slope; 6-2 vent (three vents are integrally formed in the 1# oil tank shell, the 2# oil tank shell and the 3# oil tank shell respectively); and 6-3, a stainless steel clamp.

Fig. 5 is numbered as follows: 8-1, hexagonal bolts; 8-2, a spring washer; 8-3, an oil quantity sensor (outsourcing finished products); 8-4, rubber sealing rings; 8-5.2# oil tank shell outside wall plate; 8-6.2# oil tank shell top; 8-7, aluminum alloy installation bosses.

Detailed Description

The following provides a specific embodiment of the oil tank for the unmanned aerial vehicle.

Example 1

Referring to the drawings, an unmanned aerial vehicle fuel tank is shown in fig. 1 and 2, and is composed of a 1# fuel tank housing 1, a 2# fuel tank housing 2, a 3# fuel tank housing 3, a 4# fuel tank housing 4, a fuel filler 5, a vent 6, a three-way adapter 7, a fuel measuring port 8, a vent pipe 9, an oil return port 10, a lifting lug 11, a fuel delivery pipe 12, a fuel delivery port 13, a fuel discharge port 14 and a fuel supply port 15. The oil filler 5 is positioned at the left upper part of the oil tank, is integrally formed with the 1# oil tank shell 1 and can be used for filling oil by using an oil gun or an oil pipe; the vent 6 is positioned at the top of the oil tank, is respectively integrally formed with the 1# oil tank shell 1, the 2# oil tank shell 2 and the 3# oil tank shell 3, and is communicated with the atmosphere through the three-way adapter 7 and the vent pipe 9; the oil delivery ports 13 are positioned at the bottom of the oil tank, are respectively integrally formed with the oil tank shells connected with each other, are communicated with each oil tank shell through the oil delivery pipe 12, and finally deliver oil to the consumed oil tank (the lower part of the 4# oil tank shell 4); the oil supply port 15 is positioned at the bottom of the oil tank, is integrally formed with the 4# oil tank shell 4, and supplies the fuel in the consumed oil tank to the engine through a fuel filter and a fuel pump; the oil return port 10 is positioned at the rear upper part of the 3# oil tank shell 3, is integrally formed with the 3# oil tank shell 3 and is used for recycling the residual fuel oil of the engine; the oil quantity measuring port 8 is positioned at the middle upper part of the No. 2 oil tank shell 2 and is used for installing an oil quantity sensor and measuring the residual oil quantity of the oil tank; the oil drain port 14 is positioned at the middle lower part of the 4# oil tank shell 4 and is used for installing an oil drain switch, so that residual fuel oil and sediment can be released; the lifting lugs 11 are located around the oil tank and are integrally formed with the oil tank shells respectively connected with each other, and the oil tank shells are connected with the wall plates (part of the machine body structure) on the outer sides of the 1# oil tank shell 1, the 2# oil tank shell 2, the 3# oil tank shell 3 and the 4# oil tank shell 4 through binding ropes and the lifting lugs 11 and are used for installing and fixing the oil tank.

As shown in FIG. 3, the 5-3 position of the oil filler (integrally formed with the 1# oil tank shell) is far left, so that the oil filling distance is shortened, the oil filling is convenient for personnel, the inner side is embedded with the aluminum alloy oil filler embedded part 5-2 with a rolling slope, the connection strength and the sealing performance of the oil filler are improved, and the grounding is convenient during oil filling; the outer side is clamped by a stainless steel clamping belt 5-4, so that the sealing is further enhanced; after filling, the oil filling cover 5-1 is screwed into the aluminum alloy oil filling opening embedded piece 5-2 with the rolling slope to play a role of sealing.

The air vent, the oil delivery port, the oil supply port and the oil return port can be internally embedded with an aluminum alloy adapter with a rolling slope for enhancing the connection and sealing effect, and the outer side of the aluminum alloy adapter is clamped by a clamp. Typical connection As shown in FIG. 4, the inside of the vent 6-2 is embedded with a rolled aluminum alloy adapter 6-1 and the outside is clamped with a stainless steel clamp 6-3.

The typical connection of the oil quantity sensor and the oil drain switch is shown in fig. 5, and is composed of an oil quantity sensor 8-3, a rubber sealing ring 8-4, a 2# oil tank shell outer side wall plate 8-5, a 2# oil tank shell top 8-6, a rubber sealing ring 8-4 and an aluminum alloy installation boss 8-7 in sequence from top to bottom, and the connection fixation of the oil quantity sensor and the sealing of an oil quantity measuring port are enhanced through the threaded connection of the hexagonal bolt 8-1 and the spring gasket 8-2 with the blind hole of the aluminum alloy installation boss 8-7.

The design and preparation process and method are as follows:

determining the wall thickness and the size of a 1# oil tank shell 1, a 2# oil tank shell 2, a 3# oil tank shell 3 and a 4# oil tank shell 4 according to the load of the oil tank, the space of a machine body structure and the oil carrying capacity; the size of the oil filler opening 5 is determined according to the sizes of the oil gun and the oil pipe, and the position of the oil filler opening 5 is determined according to the space property and the convenience of personnel operation; determining the positions of the air vent 6 and the oil delivery port 13 according to the flight attitude; determining the positions of an oil supply port 15 and an oil return port 10 on an oil tank according to the flying gesture and the positions of an oil inlet and an oil return port of an engine, and minimizing the length of a pipeline on the premise of ensuring flying; determining the size of an oil return port 10 according to the oil return amount of the engine; determining the sizes of an oil supply port 15 and an oil delivery port 13 according to the fuel demand of the engine; the size of the vent 6 is determined according to the flying speed and the oil pressure requirement of the fuel pump and by referring to the size of the oil supply port 15 (the cross-sectional flow rates of the two should be approximately the same); the size and the position of the oil quantity measuring port 8 and the oil discharging port 14 are respectively determined according to the size and the working principle of the oil quantity sensor and the oil discharging switch; the sizes and the numbers of the vent pipes 9, the oil delivery pipes 12 and the three-way adapter 7 are determined by the sizes and the numbers of the vent ports 6 and the oil delivery ports 13; the position, size and number of lifting lugs 11 are determined according to the tank load and the wall plates outside the tank shell.

The sizes of the oil filling cover 5-1, the aluminum alloy oil filling opening embedded piece 5-2 with the rolling slope and the stainless steel clamping belt 5-4 are determined according to the size of the oil filling opening 5; the corresponding aluminum alloy adapter (such as 6-1) with rolling slope and the stainless steel clamp (such as 6-3) are determined according to the sizes of the oil filling port 5, the air port 6, the oil return port 10, the oil delivery port 13 and the oil supply port 15. The sizes or specifications of the hexagonal bolts (8-1, 8-2, 8-4) and 8-7) of the rubber sealing rings and the aluminum alloy mounting bosses are determined according to the sizes and loads of the oil quantity sensor and the oil drain switch.

The 1# oil tank shell 1, the 2# oil tank shell 2, the 3# oil tank shell 3, the 4# oil tank shell 4, the oil filler opening 5, the air vent 6, the oil quantity measuring opening 8, the oil return opening 10, the lifting lug 11, the oil delivery opening 13, the oil discharge opening 14 and the oil supply opening 15 are integrally formed by polyurethane elastomer rubber, and can be welded by utilizing the thermoplastic property of the polyurethane elastomer rubber, and an aluminum alloy mounting boss (such as 8-7) for mounting an oil quantity sensor and an oil discharge switch is required to be placed in the oil tank shell in advance before welding; after welding, various oil ports and air ports are heated and softened by a hot air gun, an aluminum alloy oil filler insert 5-2 with a rolling slope and an aluminum alloy adapter (such as 6-1) with a rolling slope are screwed into the corresponding oil ports and air ports, and then the outer side is clamped by a stainless steel clamping belt 5-4 and a stainless steel clamping hoop (such as 6-3) to strengthen sealing and connection. When the oil quantity sensor is installed, the oil quantity sensor 8-3, the rubber sealing ring 8-4, the outer side wall plate 8-5 of the No. 2 oil tank shell, the top 8-6 of the No. 2 oil tank shell, the rubber sealing ring 8-4 and the aluminum alloy installation boss 8-7 are sequentially placed in sequence from top to bottom, and then are in threaded connection with blind holes of the aluminum alloy installation boss 8-7 through the hexagonal bolts 8-1 and the spring washers 8-2. The connection mode of the oil drain switch is similar. Finally, the air pipe 9 and the oil delivery pipe 12 are connected to the aluminum alloy adapter (such as 6-1) with the rolling slope in the corresponding air port 6 and the oil delivery port 13 by using a hot air gun.

The aluminum alloy installation boss (8-7) is a self-made 7050-T7451 aluminum alloy machined part; the tee joint adapter 7 can be a standard part made of brass; the breather pipe 9 and the oil delivery pipe 12 are cut into required lengths by adopting PU pipes with standard specifications; the oil filling cover 5-1, the aluminum alloy oil filling opening embedded part 5-2, the stainless steel clamping belt 5-4, the aluminum alloy adapter with the rolling slope (such as 6-1), the stainless steel clamp (such as 6-3), the hexagonal bolt (such as 8-1), the spring washer (such as 8-2) and the rubber sealing ring (such as 8-4) can be standard parts or finished parts with corresponding specifications.

The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the concept of the present application, and are intended to be within the scope of the present application.

Claims

1. The unmanned aerial vehicle oil tank is characterized by comprising an oil tank shell, an oil filling port, an air vent, a three-way adapter, an oil conveying port, an oil conveying pipe, an oil supply port, an oil return port, an oil quantity measuring port, an oil discharge port and a lifting lug;

the oil filler is positioned at the left upper part of the oil tank; the vent is positioned at the top of the oil tank and is communicated with the atmosphere through the vent pipe and the three-way adapter; the oil delivery port is positioned at the bottom of the oil tank and is communicated with each oil tank through an oil delivery pipe; the fuel supply port is positioned at the bottom of the fuel tank and supplies fuel to the engine through the fuel filter and the fuel pump; the oil return port is positioned at the rear upper part of the oil tank and is used for recovering the residual fuel oil of the engine; the oil quantity measuring port is positioned at the middle upper part of the oil tank and is used for installing an oil quantity sensor and measuring the residual oil quantity of the oil tank; the oil drain port is positioned at the middle lower part of the oil tank and is used for installing an oil drain switch; the lifting lugs are positioned at the periphery of the oil tank and are used for installing and fixing the oil tank;

the oil tank shell is divided into a 1# oil tank shell, a 2# oil tank shell, a 3# oil tank shell and a 4# oil tank shell; splitting the oil tank shell, wherein the oil tank shells are separated by a machine body structure, and the machine body structure is used as an outer side wall plate of the oil tank shell;

the oil filling port is integrally formed with the 1# oil tank shell, and an aluminum alloy oil filling port embedded part with a rolling slope is embedded in the oil filling port; the outer side of the oil filler is clamped by a stainless steel clamping belt, so that the sealing is further enhanced; the oil filler is left;

the oil quantity sensor in the oil quantity measuring port and the oil drain switch in the oil drain port are connected with the oil tank shell through an aluminum alloy mounting boss and a rubber sealing ring which are arranged at corresponding positions in the oil tank shell; the outer side wall plate of the oil tank shell is arranged between the oil quantity sensor, the oil drain switch and the oil tank shell, so that the connection and fixation of the oil quantity sensor and the oil drain switch are further enhanced;

the lifting lug is integrally formed with the oil tank shell and is connected with the engine body through a binding rope to play a role in supporting and fixing; when the unmanned aerial vehicle has small load and small maneuver, the oil tank shell and the engine body are fixed by using the magic tape instead of the lifting lug;

the 4# oil tank shell is divided into an upper part and a lower part, the lower part is used as a consumption oil tank, the consumption oil tank is communicated with other oil tank shells through an oil delivery port, fuel oil and sediment are released through an oil discharge port, and the engine is supplied with oil through an oil supply port, so that unavailable fuel oil in the oil tank is reduced, and the fuel oil utilization rate is improved;

the 2# oil tank shell and the 4 oil tank shell are positioned between the 1 oil tank shell and the 3 oil tank shell, and the 4# oil tank shell is positioned below the 2# oil tank shell;

the 1# oil tank shell, the 2# oil tank shell, the 3# oil tank shell, the 4# oil tank shell, the oil filling port, the vent, the oil measuring port, the oil return port, the lifting lug, the oil conveying port, the oil discharging port and the oil supply port are integrally formed by adopting polyurethane elastomer rubber.

2. The unmanned aerial vehicle fuel tank of claim 1, wherein the three vents are formed integrally with the 1# fuel tank housing, the 2# fuel tank housing and the 3# fuel tank housing, respectively, and are connected with the air inlet on the engine body skin through a plurality of vent pipes and two three-way connectors to maintain the internal pressure of the fuel tank.

3. The fuel tank for the unmanned aerial vehicle of claim 2, wherein the vent is not lower than 36mm in height and is located in the plane of symmetry of the aircraft, preventing fuel from flowing out of the vent in various flight attitudes of the unmanned aerial vehicle.

4. The unmanned aerial vehicle fuel tank of claim 1, wherein the fuel inlet is integrally formed with the fuel tank housing, and is disposed in front of, behind, left of, and right of the lower portion of the fuel tank.

5. The fuel tank for the unmanned aerial vehicle according to claim 1, wherein the fuel supply port and the consumption fuel tank are integrally formed, and are divided into a left part and a right part, so that the unmanned aerial vehicle is beneficial to supplying fuel to the engine under various flight attitudes.

6. The unmanned aerial vehicle fuel tank of claim 1, wherein the fuel return port is integrally formed with the 3# fuel tank housing, and is positioned above and behind the fuel tank, close to the engine, and shortens the fuel return distance.