CN114379797A - Unmanned aerial vehicle oil tank and unmanned aerial vehicle - Google Patents
Unmanned aerial vehicle oil tank and unmanned aerial vehicle Download PDFInfo
- Publication number
- CN114379797A CN114379797A CN202111622416.3A CN202111622416A CN114379797A CN 114379797 A CN114379797 A CN 114379797A CN 202111622416 A CN202111622416 A CN 202111622416A CN 114379797 A CN114379797 A CN 114379797A
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- Prior art keywords
- oil tank
- bubble
- unmanned aerial
- aerial vehicle
- oil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/06—Constructional adaptations thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/06—Constructional adaptations thereof
- B64D37/08—Internal partitioning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/14—Filling or emptying
- B64D37/16—Filling systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/14—Filling or emptying
- B64D37/20—Emptying systems
Abstract
The application discloses unmanned aerial vehicle oil tank includes: the main oil tank comprises an oil filling port for filling oil into the main oil tank; an anti-bubble tank chamber; the anti-bubble fuel tank cavity is located below the main fuel tank and comprises a fuel outlet, wherein the volume of the anti-bubble fuel tank cavity is the fuel volume of the engine of the unmanned aerial vehicle working at the maximum continuous power for the first fixed time; the anti-bubble oil tank cavity partition board is connected with the main oil tank and the anti-bubble oil tank cavity and comprises a one-way valve, and fuel oil of the main oil tank flows into the anti-bubble oil tank cavity through the one-way valve. The unmanned aerial vehicle oil tank structure is simple in form, high in integration level, and the problems of complexity and reliability of an independent auxiliary oil tank arrangement and oil tank internal multi-chamber pressurization control fuel transmission system commonly adopted by the unmanned aerial vehicle are solved. To the use of unmanned aerial vehicle and the relatively abominable condition of operational environment, the oil tank bottom sets up precipitation tank and bleeder valve, guarantees the relative health of fluid quality and the long-term stability of engine operation.
Description
Technical Field
The application relates to the field of unmanned aerial vehicles, especially relates to an unmanned aerial vehicle oil tank and an unmanned aerial vehicle using the oil tank.
Background
Along with the development of unmanned aerial vehicle technique, unmanned aerial vehicle gradually gets into people's the field of vision, all has important effect in fields such as survey and drawing, take photo by plane, agriculture, rescue. Wherein, the oil tank is as one of unmanned aerial vehicle important part, requires characteristics such as small, light in weight, installation maintenance convenience, convenient to use.
In addition, as the unmanned aerial vehicle airframe structure is lighter and lighter in weight, the weight control of the structure and the system is higher and higher, so that the mounting capacity of the mission load is improved and/or the range is further increased. Meanwhile, the oil tank system has important significance for the cruising ability and continuous and stable oil supply of the unmanned aerial vehicle, especially, bubbles and vibration phenomena are easily generated in the oil quantity reducing process in the oil tank, and the safe flight of the unmanned aerial vehicle is seriously influenced.
In the prior art, a small unmanned aerial vehicle mostly adopts a combined form of a main oil tank and an auxiliary oil tank (also called an anti-bubble small oil tank), an engine is supplied with oil by the auxiliary oil tank, and when fuel oil is consumed, the fuel oil in the main oil tank is conveyed to the bottom of the auxiliary oil tank under the action of negative pressure, so that the auxiliary oil tank is in a full-oil state and no bubble is generated. The main oil tank is communicated with the auxiliary oil tank through a hose, the inside of the oil tank is provided with the hose and a heavy hammer, or the inside of the auxiliary oil tank adopts a more complex multi-layer filter screen to filter bubbles and other forms of auxiliary oil tanks.
Above-mentioned form pipeline is complicated, the attach fitting is many, the weight is heavy and the maintenance work is many, is unfavorable for unmanned aerial vehicle's spatial arrangement, weight control and integration.
Disclosure of Invention
Based on the problem of above-mentioned background art, this application provides an unmanned aerial vehicle oil tank, includes: the main oil tank comprises an oil filling port for filling oil into the main oil tank; an anti-bubble tank chamber; the anti-bubble fuel tank cavity is positioned below the main fuel tank and comprises a fuel outlet, wherein the volume of the anti-bubble fuel tank cavity is the fuel volume of the engine of the unmanned aerial vehicle working at the maximum continuous power for the first fixed time; the anti-bubble oil tank cavity partition board is connected with the main oil tank and the anti-bubble oil tank cavity and comprises a one-way valve, and fuel oil of the main oil tank flows into the anti-bubble oil tank cavity through the one-way valve.
Further, the main fuel tank further includes a main fuel tank partition plate, the main fuel tank partition plate is longitudinally disposed to divide the main fuel tank into a first space and a second space in a horizontal direction, and the main fuel tank partition plate includes an oil hole for exchanging fuel in the first space and the second space.
Further, the top of the oil outlet is higher than the lowest surface of the bottom of the anti-bubble oil tank cavity, the anti-bubble oil tank cavity further comprises a liquid discharge valve, the top of the liquid discharge valve is flush with the lowest surface of the bottom of the anti-bubble oil tank cavity, and the liquid discharge valve is used for discharging impurities in the anti-bubble oil tank cavity.
Further, the top of the oil outlet is higher than a first fixed height of the bottom plane of the anti-bubble oil tank cavity, and the volume of fuel in the space between the anti-bubble oil tank cavity and the top plate surface of the oil outlet under the first fixed height is set as the volume of the settling tank.
Further, the bottom of the bubble resistant tank chamber includes a sloped side portion and a planar portion, the planar portion being the lowest surface of the bottom of the bubble resistant tank chamber.
Furthermore, the main oil tank also comprises an oil return port, and excess fuel unused by the engine enters the main oil tank through the oil return port.
Further, the anti-bubble oil tank cavity partition is a curved surface with a low middle part and high periphery, and the check valve is positioned at the center of the anti-bubble oil tank cavity partition.
Further, the bottom plane of the main oil tank has a slope, and the anti-bubble oil tank cavity is located at the lowest position of the bottom of the main oil tank.
This application still relates to an unmanned aerial vehicle, installs like above-mentioned unmanned aerial vehicle oil tank.
The beneficial effect of this application is as follows:
the utility model provides an unmanned aerial vehicle oil tank form adopts independent stereoplasm oil tank (like combined material), and the cavity is supplied to the relative confined bubble-proof of inner design, and the bubble-proof oil tank is integrated to supplying oil tank. The anti-bubble oil tank cavity adopts resin fiber cloth laying layers, so that the process is simple, the structure is simple, and the reliability is higher. The whole oil tank is only provided with an oil outlet and an oil return port and is directly connected to the fuel pump and the engine oil return port respectively, and the system has simple pipelines and good use and maintenance.
This application unmanned aerial vehicle oil tank structural style is succinct, and the integrated level is high, has avoided the often independent bellytank that adopts of unmanned aerial vehicle to arrange and the fuel system of the inside multicavity room pressurization control transmission of oil tank complicated and the reliability problem. To the use of unmanned aerial vehicle and the relatively abominable condition of operational environment, the oil tank bottom sets up precipitation tank and bleeder valve, guarantees the relative health of fluid quality and the long-term stability of engine operation.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.
Fig. 1 is a front view of an unmanned engine oil tank in a first embodiment of the present application.
Fig. 2 is a perspective view of an unmanned engine oil tank in a first embodiment of the present application.
In the figure, 1 is a main oil tank, 2 is a main oil tank partition, 3 is an anti-bubble oil tank cavity, 4 is an anti-bubble oil tank cavity partition, 5 is a one-way valve, 6 is an oil outlet, 7 is a liquid discharge valve, 8 is an oil return port, and 9 is an oil filling port.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, not all, of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a front view of an unmanned engine oil tank in a first embodiment of the present application. As shown in fig. 1, the unmanned aerial vehicle oil tank in this embodiment includes a main oil tank 1, an anti-bubble oil tank cavity 3, and the two are connected together through an anti-bubble oil tank cavity partition plate 4. Wherein the main oil tank 1 comprises an oil filling port 9 for filling oil. An oil filling port valve is arranged at the oil filling port. The oil filler is arranged on the upper part of the main oil tank 1 and fills the whole main oil tank by utilizing the action of gravity.
In this embodiment, the main oil tank is provided in a rectangular parallelepiped shape. But the shape of main fuel tank can select according to actual unmanned aerial vehicle's internal cavity shape, does not do the restriction to this. The capacity design of main oil tank can select by oneself according to unmanned aerial vehicle's kind and design. The material of the main oil tank can be selected from hard oil tanks, such as composite materials. In the embodiment, the main oil tank is divided into a first space and a second space along the horizontal direction, more partition plates can be selected according to the specific length of the main oil tank, and more spaces are divided to slow down the shaking of fuel oil.
The anti-bubble oil tank cavity 3 is positioned below the main oil tank 1 and is connected with the main oil tank through an anti-bubble oil tank cavity partition plate 4. An oil outlet 6 positioned below is formed in the anti-bubble oil tank cavity 3, and fuel oil of the anti-bubble oil tank cavity 3 is extracted by a fuel pump pipeline of the engine through the oil outlet 6 at the bottom of the oil tank. Oil is discharged from the oil outlet 6 for use by the engine. The volume of the anti-bubble oil tank cavity is the fuel oil volume of the unmanned aerial vehicle engine working at the maximum continuous power for the first fixed time.
The anti-bubble oil tank cavity partition plate 4 is connected with the main oil tank 1 and the anti-bubble oil tank cavity 3 and comprises a one-way valve 5, and fuel oil in the main oil tank 1 enters the anti-bubble oil tank cavity 3 through the one-way valve 5 so as to be used by a subsequent engine.
For promoting unmanned aerial vehicle oil tank performance, this embodiment has still set up main tank baffle 2 in main tank 1. The main tank partition 2 divides the main tank into first and second spaces in the horizontal direction. In the embodiment, the main oil tank partition plate 2 is vertically arranged and is arranged in the middle of the main oil tank 1. The main oil tank partition plate 2 is provided with an oil hole for allowing fuel oil in a left space and a right space to flow mutually so as to avoid the fuel oil in the main oil tank from shaking violently, and if the fuel oil flows and shakes in the maneuvering process of slowing down climbing, diving, rolling and the like of the unmanned aerial vehicle. Through a plurality of oilholes that 2 bottoms of main tank baffle set up, can make unmanned aerial vehicle cruise when flying flat fuel tank's liquid level resume.
The arrangement of the oil outlet 6 below the anti-bubble oil tank cavity 3 needs to be noticed, and the top of the oil outlet 6 needs to be higher than the lowest plane of the bottom of the anti-bubble oil tank cavity 3, so that a space is formed between the top of the oil outlet and the anti-bubble oil tank 3. Therefore, after the oil outlet 6 discharges the fuel, sediments such as water, impurities and the like still exist at the bottom of the anti-bubble oil tank cavity 3. At this moment, the bottom of the anti-bubble oil tank cavity 3 is also provided with a liquid discharge valve 7, the top of the liquid discharge valve 7 is flush with the lowest bottom surface of the anti-bubble oil tank cavity 3, and therefore sediment substances such as water and impurities in the anti-bubble oil tank cavity 3 can be discharged by pressing the liquid discharge valve, and fuel in the oil tank can be discharged before the unmanned aerial vehicle is stored.
It is noted that the top of the oil outlet 6 is arranged to be higher than the first height of the bottom plane of the bubble proof tank chamber 3, and the amount of fuel that can be stored in the bubble proof tank chamber 3 at this first height is defined as the volume of the sump. The volume of the precipitation tank is set to be 0.25 percent of the total volume of the unmanned engine oil tank in the embodiment
Fig. 2 is a perspective view of an unmanned engine oil tank in a first embodiment of the present application. As can be seen from fig. 2, the bottom of the bubble-proof tank chamber comprises an inclined side portion and a planar portion, and the oil outlet 6 and the drain valve 7 are located in the planar portion of the bubble-proof tank chamber. The anti-bubble tank chamber in this embodiment is a curved surface with a low middle and two high sides, and the oil outlet 6 and the liquid discharge valve 7 are located at the lowest middle plane position.
As shown in fig. 1, the main tank further includes an oil return port 8, and excess fuel that is not used by the engine enters the main tank through the oil return port 8 to be reused.
It is specially arranged that the bubble-proof oil tank cavity partition plate 4 in the embodiment is set to be a curved surface with a low middle part and a high periphery, and the check valve 5 is located at the center of the bubble-proof oil tank cavity partition plate 4. This arrangement assists the flow of fuel from the main tank to the anti-bubble tank chamber 3 by gravity.
In particular, the bottom of the main oil tank may be provided with a slope plane, and the anti-bubble tank chamber 3 is located at the lowest bottom of the main oil tank 1. A typical configuration is shown in figure 1-the tank bottom is horizontal. When unmanned aerial vehicle inner space and installation are coordinated, the main fuel tank 1), the bottom plane can design the little slope, and the one end of keeping away from promptly preventing bubble fuel tank chamber 3 is high, makes the fuel have to the potential energy that prevents bubble fuel tank chamber flow and can eliminate the dead oil under unmanned aerial vehicle horizontal attitude. This arrangement also helps the fuel in the main tank to flow by gravity to the anti-bubble tank chamber 3.
The device in the embodiment works as follows, a fuel pump pipeline of the engine extracts fuel in the anti-bubble fuel tank cavity 3 through the fuel outlet 6, and redundant fuel flows into the main fuel tank 1 through the fuel return port 8. The fuel oil in the main oil tank 1 flows downwards into the anti-bubble oil tank cavity under the combined action of inertia and negative pressure generated by fuel oil consumption through the one-way valve 5, the reliability is higher, and the anti-bubble oil tank cavity is in a full oil state. Even if the fuel oil in the oil tank is less after the unmanned aerial vehicle flies for a long time, the volume of the maximum continuous power working of the engine for half an hour is still arranged in the anti-bubble oil tank cavity, and because the baffle plate 4 of the anti-bubble oil tank cavity is provided with a slope, the redundant fuel oil which is not consumed by the engine flows into the middle one-way valve 5 through the baffle plate 4 under the inertia effect of the oil return opening 8 and continuously returns to the anti-bubble oil tank cavity 3.
The oil tank in the embodiment of the application has the following beneficial effects:
the utility model provides an unmanned aerial vehicle oil tank form adopts independent stereoplasm oil tank (like combined material), and the cavity is supplied to the relative confined bubble-proof of inner design, and the bubble-proof oil tank is integrated to supplying oil tank. The anti-bubble oil tank cavity adopts resin fiber cloth laying layers, so that the process is simple, the structure is simple, and the reliability is higher. The whole oil tank is only provided with an oil outlet and an oil return port and is directly connected to the fuel pump and the engine oil return port respectively, and the system has simple pipelines and good use and maintenance.
And this application unmanned aerial vehicle oil tank structural style is succinct, and the integrated level is high, has avoided the often independent bellytank of adopting of unmanned aerial vehicle to arrange and the fuel system of the inside multicavity room pressure boost control transmission of oil tank complicated and the reliability problem. To the use of unmanned aerial vehicle and the relatively abominable condition of operational environment, the oil tank bottom sets up precipitation tank and bleeder valve, guarantees the relative health of fluid quality and the long-term stability of engine operation.
The application still involves the unmanned aerial vehicle of an applied this oil tank.
The embodiments of the present application are described in detail above. The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the technical solutions and the core ideas of the present application. Therefore, the person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of protection of the present application. In summary, this summary should not be construed as a limitation on the present application.
Claims (9)
1. An unmanned aerial vehicle oil tank, its characterized in that includes:
the main oil tank comprises an oil filling port for filling oil into the main oil tank;
the anti-bubble oil tank cavity is positioned below the main oil tank and comprises an oil outlet, wherein the volume of the anti-bubble oil tank cavity is the fuel oil volume of the engine of the unmanned aerial vehicle working at the maximum continuous power for the first fixed time;
the anti-bubble oil tank cavity partition board is connected with the main oil tank and the anti-bubble oil tank cavity and comprises a one-way valve, and fuel oil of the main oil tank flows into the anti-bubble oil tank cavity through the one-way valve.
2. The unmanned aerial vehicle tank of claim 1,
the main oil tank further comprises a main oil tank partition plate, the main oil tank partition plate is longitudinally arranged and divides the main oil tank into a first space and a second space which are arranged along the horizontal direction, and the main oil tank partition plate comprises oil holes for exchanging fuel oil in the first space and the second space.
3. The unmanned aerial vehicle tank of claim 2,
the top of oil-out is higher than the lowest face of the bottom in gas pocket prevention oil tank chamber, gas pocket prevention oil tank chamber still includes the bleeder valve, the top of bleeder valve with the lowest face of the bottom in gas pocket prevention oil tank chamber is equal, the bleeder valve is used for discharging the impurity in the gas pocket prevention oil tank chamber.
4. The unmanned aerial vehicle sump of claim 3,
the top of the oil outlet is higher than a first fixed height of the bottom plane of the anti-bubble oil tank cavity, and the fuel quantity in the space between the anti-bubble oil tank cavity and the top plate surface of the oil outlet is set as the volume of the settling tank under the first fixed height.
5. The unmanned aerial vehicle sump of claim 3,
the bottom of the anti-bubble oil tank cavity comprises an inclined side part and a plane part, and the plane part is the lowest surface of the bottom of the anti-bubble oil tank cavity.
6. The unmanned aerial vehicle tank of claim 1,
the main oil tank also comprises an oil return port, and surplus fuel unused by an engine of the unmanned aerial vehicle enters the main oil tank through the oil return port.
7. The unmanned aerial vehicle tank of claim 1,
the anti-bubble oil tank cavity partition plate is a curved surface with a low middle part and high periphery, and the check valve is positioned at the center of the anti-bubble oil tank cavity partition plate.
8. The unmanned aerial vehicle tank of claim 1,
the main oil tank bottom plane has the slope, prevent that bubble oil tank chamber is located the lowest of the bottom of main oil tank.
9. An unmanned aerial vehicle fitted with an unmanned aerial vehicle sump according to any of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111622416.3A CN114379797A (en) | 2021-12-28 | 2021-12-28 | Unmanned aerial vehicle oil tank and unmanned aerial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111622416.3A CN114379797A (en) | 2021-12-28 | 2021-12-28 | Unmanned aerial vehicle oil tank and unmanned aerial vehicle |
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| Publication Number | Publication Date |
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| CN114379797A true CN114379797A (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111622416.3A Pending CN114379797A (en) | 2021-12-28 | 2021-12-28 | Unmanned aerial vehicle oil tank and unmanned aerial vehicle |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792022A (en) * | 2010-03-16 | 2010-08-04 | 北京航空航天大学 | Small multipurpose unmanned aerial vehicle with oil tank embedded into blended wing body |
| CN102358429A (en) * | 2011-09-01 | 2012-02-22 | 西北工业大学 | Side-by-side distribution-typed oil tank system |
| CN106542103A (en) * | 2016-11-09 | 2017-03-29 | 北京临近空间飞行器系统工程研究所 | A kind of monoblock type compartment structure liquid propellant conveyer device |
| CN209637886U (en) * | 2019-02-22 | 2019-11-15 | 广州市司派克航空器材有限公司 | A kind of turbojet engine oil piping system with throttle valve |
| CN210139974U (en) * | 2018-11-19 | 2020-03-13 | 江西壮龙无人机科技有限公司 | Anti-shaking fuel tank and unmanned aerial vehicle |
| CN110902638A (en) * | 2019-12-11 | 2020-03-24 | 苏州凯德航空科技有限公司 | Refueling system and control method thereof |
| CN210912898U (en) * | 2019-08-14 | 2020-07-03 | 湖南航天宏图无人机系统有限公司 | Oil tank for unmanned aerial vehicle and unmanned aerial vehicle |
-
2021
- 2021-12-28 CN CN202111622416.3A patent/CN114379797A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792022A (en) * | 2010-03-16 | 2010-08-04 | 北京航空航天大学 | Small multipurpose unmanned aerial vehicle with oil tank embedded into blended wing body |
| CN102358429A (en) * | 2011-09-01 | 2012-02-22 | 西北工业大学 | Side-by-side distribution-typed oil tank system |
| CN106542103A (en) * | 2016-11-09 | 2017-03-29 | 北京临近空间飞行器系统工程研究所 | A kind of monoblock type compartment structure liquid propellant conveyer device |
| CN210139974U (en) * | 2018-11-19 | 2020-03-13 | 江西壮龙无人机科技有限公司 | Anti-shaking fuel tank and unmanned aerial vehicle |
| CN209637886U (en) * | 2019-02-22 | 2019-11-15 | 广州市司派克航空器材有限公司 | A kind of turbojet engine oil piping system with throttle valve |
| CN210912898U (en) * | 2019-08-14 | 2020-07-03 | 湖南航天宏图无人机系统有限公司 | Oil tank for unmanned aerial vehicle and unmanned aerial vehicle |
| CN110902638A (en) * | 2019-12-11 | 2020-03-24 | 苏州凯德航空科技有限公司 | Refueling system and control method thereof |
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