CN113353272A - Unmanned aerial vehicle's folding oil tank - Google Patents
Unmanned aerial vehicle's folding oil tank Download PDFInfo
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- CN113353272A CN113353272A CN202110845401.7A CN202110845401A CN113353272A CN 113353272 A CN113353272 A CN 113353272A CN 202110845401 A CN202110845401 A CN 202110845401A CN 113353272 A CN113353272 A CN 113353272A
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- 239000000945 filler Substances 0.000 claims abstract description 4
- 239000000446 fuel Substances 0.000 claims description 44
- 239000002828 fuel tank Substances 0.000 claims description 35
- 230000000903 blocking effect Effects 0.000 claims description 28
- 229920001971 elastomer Polymers 0.000 claims description 22
- 230000001681 protective effect Effects 0.000 claims description 21
- 229920000742 Cotton Polymers 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 15
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 11
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 11
- 239000000806 elastomer Substances 0.000 claims description 11
- 229920000570 polyether Polymers 0.000 claims description 11
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 11
- 238000004062 sedimentation Methods 0.000 claims description 9
- RZVHIXYEVGDQDX-UHFFFAOYSA-N 9,10-anthraquinone Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 RZVHIXYEVGDQDX-UHFFFAOYSA-N 0.000 claims description 7
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 5
- 239000011496 polyurethane foam Substances 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 5
- 239000011800 void material Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 10
- 230000005484 gravity Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 335
- 239000000295 fuel oil Substances 0.000 description 26
- 239000012535 impurity Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/06—Constructional adaptations thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/32—Safety measures not otherwise provided for, e.g. preventing explosive conditions
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The invention discloses a folding oil tank of an unmanned aerial vehicle, which comprises: the oil tank top cover and the oil tank bottom cover are fixedly connected with four folding oil tank side walls; the side wall of the folding oil tank is of a folding structure, namely the side wall of the folding oil tank comprises a plurality of mutually connected folding sheets, and the joint of two adjacent folding sheets is provided with a crease for folding the side wall of the folding oil tank; be provided with the oil filler hole on the oil tank top cap, a plurality of oilless block valves are installed to the oil tank bottom, do not have the oilless block valve between be connected with oil pipeline, and oil pipeline meets with the oil feed line through the trunk line, and folding oil tank still is connected with back oil pipe way, and oil feed line meets with the choke valve respectively with back oil pipe way. The invention provides a folding oil tank for an unmanned aerial vehicle, which has variable volume in the oil tank during refueling and using processes, can prevent oil in the oil tank from surging to keep the gravity center, effectively avoids bubbles from being generated in the oil tank, and supplies oil to the unmanned aerial vehicle in time and uninterruptedly.
Description
Technical Field
The invention belongs to the technical field of oil source oil tanks, and particularly relates to a folding oil tank of an unmanned aerial vehicle.
Background
Unmanned aerial vehicle is the unmanned aircraft that utilizes radio remote control equipment and self-contained program control device to control, can automatic flight or long-range guide, can also carry the aerial operation of instrument, is used widely in the field of taking photo by plane, agriculture, rescue, survey and drawing at present, and oil moves unmanned aerial vehicle and uses to provide power with fuel cooperation engine, has to have to carry great for electric unmanned aerial vehicle, the advantage of continuation of the journey long.
Because the unmanned aerial vehicle needs to install test equipment, and the unmanned aerial vehicle is small in size, the equipment installation space is limited, the fuel tank occupies a considerable installation space, and meanwhile, the fuel tank in the prior art is made of hard alloy and polymer plastic mostly, so that the defect that the shape and the fuel containing volume are not changeable in the use process is caused. In recent years, with the development of unmanned aerial vehicle technology, the performance requirements of various fields on unmanned aerial vehicles are higher and higher, and unmanned aerial vehicles with high speed, great maneuverability, long endurance and high lift limit emerge endlessly.
To the unmanned aerial vehicle that has maneuvering ability, the atress condition of aircraft itself is comparatively complicated under this state, and the fuel liquid level constantly changes, and violent rocking has the possibility that leads to the bubble to produce simultaneously, for the normal operating of guaranteeing the unmanned aerial vehicle engine, fuel oil system especially fuel feeding circuit must be reliable, avoids the bubble to flow into the engine and leads to the flame-out of engine simultaneously.
At present, a main oil tank and a small anti-bubble oil tank are mainly adopted by a small medium-sized and small-sized unmanned aerial vehicle, namely, the main oil tank is used for pumping oil to the small anti-bubble oil tank, the oil enters an engine from the small oil tank, and the main oil tank and the small anti-bubble oil tank are both of hard structures. However, the volume of the small oil tank is limited, and under the condition of long-time maneuvering, the oil in the small oil tank runs out, so that the running of an engine is dangerous; meanwhile, the main oil tank can have more dead oil, and the oil pipe can be leaked outside the liquid level due to shallow liquid level and small maneuvering or swing caused by gust in the final stage of flight, so that an engine is flamed out due to the fact that large bubbles are sucked. Simultaneously, under the long-time maneuvering condition, fuel is used up gradually in the oil tank, perhaps unmanned aerial vehicle carries out the every single move flight and in the oil tank oil volume be few and when not submerging defeated oil pipe, the oil tank just can't in time be the unmanned aerial vehicle fuel feeding, these all adopt hard material as the drawback of unmanned aerial vehicle oil tank. Therefore, under the condition that the total volume of the oil tank is determined, the special requirement that the storage volume is variable is met, namely, along with continuous consumption of fuel in the oil tank, the occupied volume of the oil tank and the volume of the fuel stored in the oil tank can be reduced, so that the volume of the oil tank can be minimized before ground refueling and after the fuel in the oil tank is exhausted, the volume of the oil tank can be gradually expanded in the refueling process, the unmanned aerial vehicle can be conveniently transported and carried, and the special aircraft can be used in a special environment, such as cross-medium flying equipment.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a folding fuel tank of a drone, comprising:
the oil tank comprises an oil tank top cover and an oil tank bottom cover, wherein four folding oil tank side walls are fixedly connected between the oil tank top cover and the oil tank bottom cover;
the side wall of the foldable oil tank is of a foldable fold structure, namely the side wall of the foldable oil tank comprises a plurality of mutually connected folding sheets, and a crease for folding the side wall of the foldable oil tank is arranged at the joint of two adjacent folding sheets;
be provided with the oil filler hole on the oil tank top cap, the oil tank bottom is installed a plurality of oilless and is blocked the valve, oilless is blocked and is connected with oil pipeline between the valve, oil pipeline passes through the trunk line and meets with the oil feed line, folding oil tank still is connected with back oil pipe way, oil feed line meets with the choke valve respectively with back oil pipe way.
Preferably, wherein the oil-free blocking valve has a structure including:
the oil tank comprises a protective shell, a plurality of oil inlet grooves, a plurality of elliptical grooves and a mounting plane, wherein the side face of the protective shell is provided with the plurality of oil inlet grooves, the top of the protective shell is provided with the plurality of elliptical grooves, and the bottom of the protective shell is the mounting plane connected with the bottom cover of the oil tank;
the valve body is arranged below the protective shell, a cavity between the protective shell and the valve body is a buoyancy cavity, and the oil inlet groove and the elliptical groove are respectively communicated with the buoyancy cavity; the middle part of the valve body is fixedly provided with an installation cylinder body, and a linear bearing is fixedly arranged in the installation cylinder body; an oil through hole is formed in the bottom of the valve body, and an O-shaped sealing ring is arranged on the circumferential end face of the oil through hole;
the valve core is movably arranged in the linear bearing, the upper end of the valve core is fixedly connected with a rigid buoyancy block, the upper surface of the rigid buoyancy block is matched with the inner wall of the protective shell, and the lower surface of the rigid buoyancy block is matched with the inner wall of the valve body;
the lower end shell is fixedly arranged below the valve body, an oil collecting groove is arranged in the lower end shell, and the oil collecting groove is communicated with the buoyancy cavity through an oil through hole; the lower end shell is fixedly connected with a quick connector, and two ends of the quick connector are respectively communicated with the oil conveying pipeline and the oil collecting groove.
Preferably, the oil tank top cover, the oil tank bottom cover and the folding sheet are all made of multilayer polyether type thermoplastic polyurethane elastomer rubber, filling cotton is filled in the oil tank top cover, the oil tank top cover and the folding sheet, the filling cotton is a three-dimensional framework formed by wall shells left after polyurethane foam is subjected to reticulation treatment, the filling cotton is a 12-face pentagon body in the internal shape, and the filling cotton contains more than 97% of void volume.
Preferably, a plurality of sedimentation tanks are arranged on the inner wall of the oil tank bottom cover, and the arrangement direction of the sedimentation tanks is perpendicular to the installation direction of the oil conveying pipeline; the precipitation tank is formed by adopting polyether type thermoplastic polyurethane elastomer rubber through ultrasonic welding.
Preferably, wherein the rigid buoyancy block is a rigid polyurethane buoyancy block.
Preferably, the folding oil tank comprises a main oil tank and an auxiliary oil tank, the oil filling port is arranged on the main oil tank, vent holes are arranged on the top covers of the main oil tank and the auxiliary oil tank, the two vent holes are communicated through an exhaust pipe, the main oil tank and the auxiliary oil tank are communicated with an oil conveying pipeline through an oil-free blocking valve, and the main oil tank and the auxiliary oil tank are both fixedly arranged in the mounting frame;
the structure of the oil supply line includes:
one end of the oil supply pipeline is connected with the main pipeline, the other end of the oil supply pipeline is connected to the throttling valve, and an oil supply filter element and an oil supply flowmeter are mounted on the oil supply pipeline;
the structure of the oil return pipeline comprises:
one end of the oil return pipeline is connected with a main oil tank of the folding oil tank, the other end of the oil return pipeline is connected to the throttle valve, and an oil return filter element and an oil return flowmeter are mounted on the oil return pipeline;
oil supply pipeline, trunk line, oil supply filter core, oil supply flowmeter, oil return pipeline, oil return filter core and oil return flowmeter all install on the installation frame.
Preferably, the folding fuel tank further comprises a control system, and the control system comprises:
the top cover of the oil tank is provided with an exhaust electromagnetic valve and an oil tank air pressure sensor, and the bottom cover of the oil tank is provided with a liquid level sensor and an oil quantity pressure sensor;
the control circuit board is arranged outside the folding oil tank, the oil supply flowmeter, the oil return flowmeter, the exhaust electromagnetic valve, the oil tank air pressure sensor, the liquid level sensor and the oil mass pressure sensor are respectively connected with the control circuit board, and the control circuit board is also connected with a flight control computer;
a wiring harness pipe is arranged on the folding oil tank, and wiring harnesses of the oil tank air pressure sensor, the liquid level sensor and the oil quantity pressure sensor penetrate through the wiring harness pipe.
Preferably, wherein the oil supply flow meter, the oil return flow meter and the control circuit board are all installed in a waterproof box, and the waterproof box is installed on the installation frame.
The invention at least comprises the following beneficial effects: according to the folding oil tank of the unmanned aerial vehicle, the material of the oil tank is improved into a foldable design formed by ultrasonic welding of a plurality of layers of polyether type thermoplastic polyurethane elastomer rubber, so that the accommodating volume of the oil tank can be correspondingly changed along with the change of the oil mass in the oiling and using processes of the folding oil tank, and the volume of the folding oil tank can be reduced along with the reduction of the internal oil mass;
when the foldable oil tank of the invention supplies oil, no bubble is generated in the oil tank, and the fuel oil in the foldable oil tank can be prevented from greatly surging in the flight process of the unmanned aerial vehicle, so that the foldable oil tank supplies oil to the unmanned aerial vehicle more stably, safely and reliably, and can replace the anti-bubble oil tank of a small unmanned aerial vehicle;
the oil tank top cover, the oil tank bottom cover and the folding sheet of the folding oil tank are all composed of the multi-layer polyether type thermoplastic polyurethane elastomer rubber, so that the inner layer of the oil tank has excellent oil resistance while the folding structure design of the oil tank is realized, and the outer layer has the advantages of water resistance and ultraviolet resistance; the oil tank material has the conductive characteristic and excellent antistatic performance. The polyether type thermoplastic polyurethane elastomer rubber has good conductivity, has the functions of preventing surge and keeping the center and bottom shapes of the folded oil tank, and can prevent the bottom of the oil tank from deforming during oil filling, oil supplying and oil discharging. Meanwhile, filling cotton is filled in an oil tank material made of multi-layer polyether type thermoplastic polyurethane elastomer rubber, the filling cotton is a three-dimensional framework formed by wall shells left after polyurethane foam is subjected to reticulation treatment, the internal shape of the filling cotton is a pentagonal 12-sided body, the filling cotton contains more than 97% of void volume, and the weight is very low; the fuel tank filling material adopting the design can prevent fuel surge, keep the gravity center of the folded fuel tank and provide a three-dimensional fireproof barrier for the folded fuel tank; in extreme cases, even if the folded fuel tank burns, the flame can be limited to expand rapidly and the pressure wave can be reduced, so that a series of chain reactions can be prevented, and the folded fuel tank can be prevented from exploding.
When the fuel quantity in the folding fuel tank is less than 30%, the unmanned aerial vehicle flies at +/-45 degrees in rolling and +/-30 degrees in pitching for a long time, and the traditional heavy hammer fuel supply mode has the risk of fuel supply interruption; the oil-free blocking valve is arranged on the oil tank bottom cover of the folding oil tank, so that fuel oil can enter an oil conveying pipeline through the oil-free blocking valve as long as the fuel oil submerges the oil-free blocking valve, and uninterrupted oil supply is carried out on the unmanned aerial vehicle. According to the folding oil tank, 4-8 oil-free blocking valves can be arranged on the bottom cover of the oil tank, the oil-free blocking valves are automatically closed when oil is absent and automatically opened when oil is present, and an uninterrupted oil supply mode is realized.
The oil tank bottom cover of the folding oil tank is also provided with the sedimentation tank, and impurities in the fuel oil are precipitated in the sedimentation tank, so that the impurities precipitated in the sedimentation tank cannot flow along with the fuel oil, the impurities are prevented from flowing into the oil-free blocking valve and the oil conveying pipeline along with the fuel oil, and the impurities are prevented from blocking the oil-free blocking valve and the oil conveying pipeline.
The folding fuel tank provided by the invention can be used for special environment airplanes, such as cross-medium airplanes, aircrafts used in water and air.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a folding fuel tank of an unmanned aerial vehicle provided by the invention;
FIG. 2 is a schematic side view of a folding fuel tank of the UAV;
FIG. 3 is a schematic perspective view of an oil-free blocking valve;
FIG. 4 is a schematic sectional view of an oil-free shutoff valve closed;
FIG. 5 is a schematic sectional view of an oil-free block valve when open;
FIG. 6 is a schematic view of a connection structure of an oil-free blocking valve and an oil pipeline;
FIG. 7 is a schematic structural diagram of an oil tank bottom cover and a settling tank;
FIG. 8 is a schematic cross-sectional view of a folded sheet;
FIG. 9 is a schematic view of the folded fuel tank in a folded state before refueling;
FIG. 10 is a schematic view of the fuel flow direction of the folded tank supply line and return line;
FIG. 11 is a schematic view of the interior of a folding fuel tank when the unmanned aerial vehicle flies at a large angle;
FIG. 12 is an enlarged view taken at A in FIG. 11;
FIG. 13 is a schematic view of a bottom cover of a folded fuel tank;
FIG. 14 is a schematic view of a tank head structure of a folded tank;
fig. 15 is a block diagram of the flight control computer and the control circuit board connecting each component.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It is to be understood that in the description of the present invention, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are used only for convenience in describing the present invention and for simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or a communication between two elements, and those skilled in the art will understand the specific meaning of the terms in the present invention specifically.
Further, in the present invention, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacted with the first and second features, or indirectly contacted with the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1-15: the invention relates to a folding oil tank of an unmanned aerial vehicle, which comprises:
the oil tank comprises an oil tank top cover 1 and an oil tank bottom cover 2, wherein four folding oil tank side walls 3 are fixedly connected between the oil tank top cover 1 and the oil tank bottom cover 2;
the folding oil tank side wall 3 is of a folding fold structure, namely the folding oil tank side wall 3 comprises a plurality of mutually connected folding sheets 31, and a crease for folding the folding oil tank side wall 3 is arranged at the joint of two adjacent folding sheets 31;
be provided with oil filler hole 101 on the oil tank top cap 1, oil tank bottom 2 is installed a plurality of oilless block valves 4, oilless block is connected with oil pipeline 5 between the valve 4, oil pipeline 5 meets with supplying oil pipe way through trunk line 11, folding oil tank still is connected with back oil pipe way, supply oil pipe way and return oil pipe way to meet with the choke valve respectively.
The working principle is as follows: the folding oil tank provided by the invention is used for continuously supplying oil to the unmanned aerial vehicle, before oiling, the folding oil tank is in a completely folded flat shape, the folding oil tank gradually expands along with the continuous injection of fuel oil through an oil filling port, and the side walls of the four oil tanks consisting of the folding sheets 31 are gradually propped up; at unmanned aerial vehicle flight in-process, the incessant fuel feeding for unmanned aerial vehicle of folding oil tank, the fuel volume in the folding oil tank reduces gradually, and the folding oil tank changes to fold condition by the expansion gradually, and when the fuel exhausts, the folding oil tank resumes to fold flat form completely. The folding oil tank is suitable for two modes of gravity oiling and pressure oiling, the oiling time is not more than 20min, and 3% of expansion space is reserved when the oil tank is full of oil. When the foldable oil tank supplies oil to the unmanned aerial vehicle, fuel oil flows into the oil pipeline 5 through the oil-free blocking valve 4, then flows into the oil supply pipeline through the main pipeline 11, and finally is conveyed into an engine of the unmanned aerial vehicle through the oil pump and the throttle valve; the fuel in the throttle valve is conveyed back to the folding fuel tank through the return line. According to the folding oil tank of the unmanned aerial vehicle, the oil tank is improved into a foldable design, so that the accommodating volume of the oil tank can be correspondingly changed along with the change of the oil quantity in the oiling and using processes of the folding oil tank, bubbles are effectively prevented from being generated in the oil tank, the fuel oil in the folding oil tank can be prevented from greatly surging in the flying process of the unmanned aerial vehicle, and the folding oil tank can supply oil to the unmanned aerial vehicle more stably, safely and reliably.
In the above technical solution, the structure of the oil-free blocking valve 4 includes:
the fuel tank comprises a protective shell 41, a plurality of fuel inlet grooves 42 are formed in the side surface of the protective shell 41, a plurality of elliptical grooves 43 are formed in the top of the protective shell 41, and a mounting plane 44 connected with the bottom cover of the fuel tank is arranged at the bottom of the protective shell 41;
the valve body 45 is arranged below the protective shell 41, a cavity between the protective shell 41 and the valve body 45 is a buoyancy cavity 46, and the oil inlet groove 42 and the elliptical groove 43 are respectively communicated with the buoyancy cavity 46; an installation cylinder 47 is fixedly arranged in the middle of the valve body 45, and a linear bearing 6 is fixedly arranged in the installation cylinder 47; an oil through hole 48 is formed in the bottom of the valve body 45, and an O-shaped sealing ring 7 is arranged on the circumferential end face of the oil through hole 48;
the valve core 49 is movably arranged in the linear bearing 6, the upper end of the valve core 49 is fixedly connected with the rigid buoyancy block 8, the upper surface of the rigid buoyancy block 8 is matched with the inner wall of the protective shell 41, and the lower surface of the rigid buoyancy block 8 is matched with the inner wall of the valve body 45;
a lower end housing 410 fixedly arranged below the valve body 45, wherein an oil collecting groove 411 is arranged in the lower end housing 410, and the oil collecting groove 411 is communicated with the buoyancy chamber 46 through an oil through hole 48; the lower end shell 410 is fixedly connected with a quick coupling 9, and two ends of the quick coupling 9 are respectively communicated with the oil pipeline 5 and the oil collecting groove 411. As shown in fig. 5, 11 and 12, when the fuel oil submerges the oil inlet tank 42, the fuel oil enters the buoyancy chamber 46 through the oil inlet tank 42, the rigid buoyancy block 8 moves upward under the buoyancy of the fuel oil, thereby driving the valve core 49 to lift, at this time, the fuel oil flows to the interior of the valve body 45 through the space formed between the floating rigid buoyancy block 8 and the valve body 45, the fuel oil flows downward in the valve body 45, flows into the oil collecting tank 411 through the oil through hole 48, and finally flows into the oil delivery pipeline 5 through the oil collecting tank 411 and the quick connector 9, and the arrow in fig. 5 shows the flow direction of the fuel oil. When the fuel level is lower than the installation plane of the bottom cover 2 of the fuel tank, as shown in fig. 4, because the valve core 49 is subjected to the downward pull force of gravity and the viscosity of the fuel flow and the negative pressure caused by the suction of the oil pump, the buoyancy generated by the fuel height in the buoyancy cavity 46 is not enough to lift the rigid buoyancy block 8, the valve core 49 further descends along with the fuel level until the bottom of the valve core 49 contacts with the O-ring 7, and the valve core 49 and the O-ring 7 cooperate to completely block the oil through hole 48, namely, the valve core 49 completely closes the oil-free blocking valve 4. At this time, a part of the fuel is still stored in the oil sump 411 and the upper portion of the valve body 45, and this part of the fuel can prevent air bubbles from entering the oil passage while cutting off the fuel passage. Figure 11 is during unmanned aerial vehicle wide-angle flight, the inside schematic diagram of folding oil tank, because in the picture the fuel liquid level only blocks the valve submergence with the oilless of right-hand member, and the oilless of left end blocks the valve and is not by the fuel submergence, therefore the oilless of right-hand member blocks the valve and is in the open mode, and the oilless of left end blocks the valve and is in the closed mode. The oil-free blocking valve 4 can be connected with two or one quick coupling according to different installation positions, as shown in fig. 4 and 5, the oil-free blocking valve 4 is connected with two quick couplings 9, and fig. 6 is a schematic diagram of the oil-free blocking valve 4 is connected with one quick coupling.
In the above technical scheme, the oil tank top cover 1, the oil tank bottom cover 2 and the folding pieces 31 are all made of multilayer polyether type thermoplastic polyurethane elastomer rubber, filling cotton 32 is filled in the oil tank top cover 1, the oil tank top cover 2 and the folding pieces 31, and the filling cotton 32 is a three-dimensional framework made of wall shells left after the polyurethane foam is subjected to reticulation treatment. By adopting the arrangement, the folding structure design of the oil tank is realized, and meanwhile, the inner layer of the oil tank has excellent oil resistance, and the outer layer has the advantages of water resistance and ultraviolet resistance; the oil tank material has the conductive characteristic and excellent antistatic performance. Meanwhile, filling cotton is filled in an oil tank material made of multi-layer polyether type thermoplastic polyurethane elastomer rubber, the filling cotton 32 is a three-dimensional framework formed by wall shells left after polyurethane foam is subjected to reticulation treatment, the internal shape of the filling cotton 32 is a pentagonal 12-sided body, the filling cotton contains more than 97% of void volume, and the weight is very low; the fuel tank filling material adopting the design can prevent fuel surge, keep the gravity center of the folded fuel tank and provide a three-dimensional fireproof barrier for the folded fuel tank; in extreme cases, even if the folded fuel tank burns, the flame can be limited to expand rapidly and the pressure wave can be reduced, so that a series of chain reactions can be prevented, and the folded fuel tank can be prevented from exploding.
In the technical scheme, a plurality of sedimentation tanks 21 are arranged on the inner wall of the oil tank bottom cover 2, and the arrangement direction of the sedimentation tanks 21 is vertical to the installation direction of the oil pipeline 5; the precipitation tank 21 is formed by ultrasonically welding polyether type thermoplastic polyurethane elastomer rubber. Impurities in the fuel are precipitated in the precipitation tank 21, so that the impurities precipitated in the precipitation tank 21 cannot flow along with the fuel, the impurities are prevented from flowing into the oil-free blocking valve and the oil delivery pipeline along with the fuel, and the impurities are prevented from blocking the oil-free blocking valve 4 and the oil delivery pipeline 5; the settling tank 21 can be used for settling impurities in the fuel oil and can also be used as a fixing device for fixing the main fuel tank body on the mounting frame.
In the above technical solution, the rigid buoyancy block 8 is a rigid polyurethane buoyancy block.
In the above technical solution, as shown in fig. 13 and 14, the folding oil tank includes a main oil tank 102 and a secondary oil tank 103, the oil filling port 101 is arranged on the main oil tank 102, vent holes 105 are arranged on tank top covers of the main oil tank 102 and the secondary oil tank 103, the two vent holes 105 are communicated through an exhaust pipe 104, the main oil tank 102 and the secondary oil tank 103 are communicated with an oil delivery pipeline 5 through an oil-free blocking valve 4, and both the main oil tank 102 and the secondary oil tank 103 are fixedly arranged in a mounting frame;
when in refueling, tools such as a refueling gun are used for refueling, fuel oil is filled into the main oil tank through the refueling port 101 under the action of gravity or pressure, the bottom of the main oil tank is communicated with the auxiliary oil tank through an oilless blocking valve to form a communicating vessel, the fuel oil enters the auxiliary oil tank, along with the filling of the fuel oil, air in the auxiliary oil tank enters the main oil tank through the vent hole 105 and the connecting pipe 104 at the top, and then is discharged from the refueling port until the main oil tank 102 is full of the fuel oil;
the structure of the oil supply line includes:
an oil supply pipeline 10, one end of which is connected with the main pipeline 11 and the other end of which is connected to a throttle valve, wherein an oil supply filter element 12 and an oil supply flowmeter 13 are arranged on the oil supply pipeline 10;
the structure of the oil return pipeline comprises:
and one end of the oil return pipeline 14 is connected with the main oil tank 102 of the folded oil tank, the other end of the oil return pipeline is connected to a throttle valve, and an oil return filter element 15 and an oil return flowmeter 16 are installed on the oil return pipeline 14. The oil supply filter element 12 is used for filtering fuel oil flowing into the throttling valve from the oil supply pipeline 10, and the oil return filter element 15 is used for filtering fuel oil flowing into the folding oil tank from the throttling valve; the fuel supply flowmeter 13 and the oil return flowmeter 16 respectively collect fuel flow information in the fuel supply pipeline 10 and the oil return pipeline 14, and the arrow direction in fig. 10 is the flow direction of the fuel in the fuel supply pipeline and the oil return pipeline;
when the foldable oil tank supplies oil to the unmanned aerial vehicle, fuel oil enters the main pipeline 11 through the oil-free blocking valve 4 at the bottoms of the main oil tank 102 and the auxiliary oil tank 103, reaches an oil supply port through an oil outlet, the oil supply filter element 12 and the oil supply flowmeter 13, and is conveyed to an engine through an oil pump (not shown) and a throttle valve; the other path of fuel is conveyed to an oil return port through a throttle valve, passes through an oil return flowmeter 16 and an oil return filter element 15 and returns to the main fuel tank 102. The volumes of the main tank 102 and the sub-tank 103 are equal to each other and are 24.4L. The oil supply filter element 12 and the oil return filter element 15 are both arranged on the front surface of the main oil tank 102, and are convenient to replace.
Because folding oil tank is when carrying out the fuel feeding for unmanned aerial vehicle, the volume of folding oil tank can be folded and is dwindled, and the interval between oil tank bottom 2 and the advantage top cap 1 can diminish, consequently fuel feeding pipeline 10, trunk line 11, fuel feeding filter core 12, fuel feeding flowmeter 13, oil return pipeline 14, oil return filter core 15 and oil return flow 16 meter are all installed on the installation frame.
In the above technical scheme, the oil-free blocking valve is installed in pairs on the oil tank bottom cover 2, 8 oil-free blocking valves are installed on the oil tank bottom covers of the main oil tank and the auxiliary oil tank shown in fig. 13, and the oil tank is better for the uninterrupted oil supply of the unmanned aerial vehicle when the flight angle is large.
In the technical scheme, two sides of the ground of the oil tank of the folding oil tank are slightly higher than the middle of the folding oil tank, the arrangement mode can realize the maximum utilization of the residual fuel oil in the folding oil tank, the two sides of the bottom surface of the folding oil tank are slightly higher than the middle of the bottom surface of the folding oil tank to form a slope which is 1 degree to the horizontal plane, and the residual fuel oil finally flows into the middle of the folding oil tank through the slope along with the consumption of the fuel oil so as to exhaust the fuel oil to the maximum extent.
In the above technical solution, the folding fuel tank further includes a control system, and the control system includes:
the top cover of the oil tank is provided with an exhaust electromagnetic valve 17 and an oil tank air pressure sensor 18, and the bottom cover of the oil tank is provided with a liquid level sensor and an oil quantity pressure sensor;
and the control circuit board 20 is installed outside the folding oil tank, the oil supply flowmeter 13, the oil return flowmeter 16, the exhaust electromagnetic valve 17, the oil tank air pressure sensor, the liquid level sensor and the oil mass pressure sensor are respectively connected with the control circuit board 20, and the control circuit board is also connected with a flight control computer. As shown in fig. 15, when the flying altitude of the aircraft changes, the folded oil tank supplements or removes air through the exhaust solenoid valve, and the start and stop of the exhaust solenoid valve are controlled by the control circuit board. The oil tank pressure sensor is used for monitoring the air pressure inside the folding oil tank in real time, the liquid level sensor detects the distance from the bottom of the folding oil tank to the water surface, and the oil quantity pressure sensor is used for acquiring and calculating the oil quantity information of the folding oil tank and transmitting the information to the flight control computer through a 485 interface. In the fuel consumption process, the control circuit board simultaneously records data of two paths of flow meters and sends the data to the flight control computer, so that the residual oil quantity, the instantaneous flow and the accumulated consumed oil quantity are obtained; in the whole using process, the control circuit board continuously receives signals of an oil tank air pressure sensor, a liquid level sensor (water level) and the like to obtain the pressure, the water level state and the like in the oil tank, transmits and records data, and correspondingly controls the exhaust electromagnetic valve which can also be taken over by the flight control computer;
a wire bundle pipe 21 is arranged on the folding oil tank, and wire harnesses of the oil tank air pressure sensor, the liquid level sensor and the oil quantity pressure sensor 18 are arranged in the wire bundle pipe 21 in a penetrating way
In the above technical solution, the oil supply flow meter 13, the oil return flow meter 16 and the control circuit 20 are all installed in a waterproof box 19, and the waterproof box 19 is installed on the installation frame.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (9)
1. The utility model provides an unmanned aerial vehicle's folding oil tank which characterized in that includes:
the oil tank comprises an oil tank top cover and an oil tank bottom cover, wherein a plurality of folding oil tank side walls are fixedly connected between the oil tank top cover and the oil tank bottom cover;
the side wall of the foldable oil tank is of a foldable fold structure, namely the side wall of the foldable oil tank comprises a plurality of mutually connected folding sheets, and a crease for folding the side wall of the foldable oil tank is arranged at the joint of two adjacent folding sheets;
be provided with the oil filler hole on the oil tank top cap, the oil tank bottom is installed a plurality of oilless and is blocked the valve, oilless is blocked and is connected with oil pipeline between the valve, oil pipeline passes through the trunk line and meets with the oil feed line, folding oil tank still is connected with back oil pipe way, oil feed line meets with the choke valve respectively with back oil pipe way.
2. The folding fuel tank of unmanned aerial vehicle of claim 1, characterized in that, the structure of the oil-free blocking valve includes:
the oil tank comprises a protective shell, a plurality of oil inlet grooves, a plurality of elliptical grooves and a mounting plane, wherein the side face of the protective shell is provided with the plurality of oil inlet grooves, the top of the protective shell is provided with the plurality of elliptical grooves, and the bottom of the protective shell is the mounting plane connected with the bottom cover of the oil tank;
the valve body is arranged below the protective shell, a cavity between the protective shell and the valve body is a buoyancy cavity, and the oil inlet groove and the elliptical groove are respectively communicated with the buoyancy cavity; the middle part of the valve body is fixedly provided with an installation cylinder body, and a linear bearing is fixedly arranged in the installation cylinder body; an oil through hole is formed in the bottom of the valve body, and an O-shaped sealing ring is arranged on the circumferential end face of the oil through hole;
the valve core is movably arranged in the linear bearing, the upper end of the valve core is fixedly connected with a rigid buoyancy block, the upper surface of the rigid buoyancy block is matched with the inner wall of the protective shell, and the lower surface of the rigid buoyancy block is matched with the inner wall of the valve body;
the lower end shell is fixedly arranged below the valve body, an oil collecting groove is arranged in the lower end shell, and the oil collecting groove is communicated with the buoyancy cavity through an oil through hole; the lower end shell is fixedly connected with a quick connector, and two ends of the quick connector are respectively communicated with the oil conveying pipeline and the oil collecting groove.
3. The folding oil tank of the unmanned aerial vehicle as claimed in claim 1, wherein the oil tank top cover, the oil tank bottom cover and the folding sheet are all made of multi-layer polyether type thermoplastic polyurethane elastomer rubber, filling cotton is filled in the oil tank top cover, the oil tank top cover and the folding sheet, the filling cotton is a three-dimensional framework made of wall shells left after polyurethane foam is subjected to reticulation treatment, the internal shape of the filling cotton is a pentagonal 12-face body, and the filling cotton contains more than 97% of void volume.
4. The folding oil tank of the unmanned aerial vehicle as claimed in claim 3, wherein the inner wall of the oil tank bottom cover is provided with a plurality of sedimentation tanks, and the sedimentation tanks are arranged in a direction perpendicular to the installation direction of the oil pipeline; the precipitation tank is formed by adopting polyether type thermoplastic polyurethane elastomer rubber through ultrasonic welding.
5. The folding fuel tank of unmanned aerial vehicle of claim 2, characterized in that the rigid buoyancy block is a rigid polyurethane buoyancy block.
6. The folding oil tank of the unmanned aerial vehicle as claimed in claim 1, wherein the folding oil tank comprises a main oil tank and a secondary oil tank, the oil filling port is arranged on the main oil tank, the oil tank top covers of the main oil tank and the secondary oil tank are provided with vent holes, the two vent holes are communicated through an exhaust pipe, the main oil tank and the secondary oil tank are communicated with an oil conveying pipeline through an oil-free blocking valve, and the main oil tank and the secondary oil tank are both fixedly arranged in the mounting frame;
the structure of the oil supply line includes:
one end of the oil supply pipeline is connected with the main pipeline, the other end of the oil supply pipeline is connected to the throttling valve, and an oil supply filter element and an oil supply flowmeter are mounted on the oil supply pipeline;
the structure of the oil return pipeline comprises:
one end of the oil return pipeline is connected with a main oil tank of the folding oil tank, the other end of the oil return pipeline is connected to the throttle valve, and an oil return filter element and an oil return flowmeter are mounted on the oil return pipeline;
oil supply pipeline, trunk line, oil supply filter core, oil supply flowmeter, oil return pipeline, oil return filter core and oil return flowmeter all install on the installation frame.
7. The folding fuel tank of unmanned aerial vehicle of claim 1, wherein the fuel tank ground of the folding fuel tank is slightly higher than the middle.
8. The folding fuel tank of unmanned aerial vehicle of claim 6, further comprising a control system, the control system comprising:
the top cover of the oil tank is provided with an exhaust electromagnetic valve and an oil tank air pressure sensor, and the bottom cover of the oil tank is provided with a liquid level sensor and an oil quantity pressure sensor;
the control circuit board is arranged outside the folding oil tank, the oil supply flowmeter, the oil return flowmeter, the exhaust electromagnetic valve, the oil tank air pressure sensor, the liquid level sensor and the oil mass pressure sensor are respectively connected with the control circuit board, and the control circuit board is also connected with a flight control computer;
a wiring harness pipe is arranged on the folding oil tank, and wiring harnesses of the oil tank air pressure sensor, the liquid level sensor and the oil quantity pressure sensor penetrate through the wiring harness pipe.
9. The folding fuel tank of unmanned aerial vehicle of claim 8, wherein the fuel supply flow meter, the oil return flow meter and the control circuit board are all mounted in a waterproof box, the waterproof box being mounted on the mounting frame.
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| CN202110845401.7A CN113353272B (en) | 2021-07-26 | 2021-07-26 | Unmanned aerial vehicle's folding oil tank |
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| CN202110845401.7A CN113353272B (en) | 2021-07-26 | 2021-07-26 | Unmanned aerial vehicle's folding oil tank |
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| CN116593226A (en) * | 2023-07-14 | 2023-08-15 | 哈尔滨学院 | A three-dimensional monitoring devices of pollutant distribution for modeling |
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