CN217374913U - A UAV fuel system - Google Patents

Abstract

The utility model provides an unmanned aerial vehicle fuel oil system, includes oil storage tank, fuel feeding oil tank, the check valve and the protection valve of overturning that admits air, the fuel feeding oil tank is less than on spatial arrangement the oil storage tank, the oil storage tank with fuel feeding oil tank intercommunication, admit air the check valve with the protection valve of overturning set up in on the oil storage tank, admit air the check valve with the protection valve of overturning is used for providing fresh air for the oil storage tank, the protection valve of overturning is used for preventing the fuel and spills over. The utility model discloses an unmanned aerial vehicle fuel oil system processing, production, assembly and maintenance are simple and convenient, and the cost is lower, can balance the low pressure, eliminate excessive pressure and carry out the protection of overturning to the fuel oil system, make unmanned aerial vehicle when verting and every single move, the fuel does not spill over, has eliminated potential safety hazard and environmental pollution.

Description

A UAV fuel system

technical field

The utility model relates to the field of unmanned aerial vehicles, in particular to an unmanned aerial vehicle fuel system.

Background technique

With the rapid development of the global drone market, drones have been widely used in various fields such as security inspection, technical reconnaissance, logistics travel, consumer life, and agriculture, forestry and plant protection. The power system of the UAV has a decisive influence on the development of the UAV, so it also puts forward new requirements for the fuel system of the aero-engine, and it is very important to design a highly reliable UAV fuel system.

The UAV fuel system can supply clean fuel with rated pressure and flow to the engine under all flight conditions allowed by the UAV; the fuel system also needs to store a considerable amount of fuel to ensure that the UAV has enough distance. Driving mileage; the fuel system also needs to ensure that the UAV does not leak oil or oil supply is not smooth when hovering, leveling, and pitching at a large angle; the design of the fuel system will also affect the UAV to a certain extent. Lightweight, ensuring it is suitable for drone flying.

In the utility model patent with the publication number CN212074446U, a high-reliability fuel system for large unmanned aerial vehicles is disclosed. The fuel tank system uses three fuel tanks: front, middle and rear. Connected; the front fuel tank is used for refueling the entire fuel tank system; the middle fuel tank has the lowest bottom in the vertical direction, and delivers fuel to the engine through the fuel supply system; the rear fuel tank adjusts the balance of the overall fuselage while storing fuel; the structure adopts a purely mechanical type Gravity oil transportation technology, the structure is very simple, and the redundant design is adopted to realize the adjustment function of the center of gravity. However, the front, middle and rear fuel tanks set in this scheme will inevitably bring about the problem of increasing the weight of the drone, which is not conducive to light weight.

In the invention patent publication number CN112340037A, a dual-chamber fuel system suitable for UAV dive flight is disclosed. The dual-chamber fuel system consists of a soft fuel tank and an oil-gas separator, and the oil-gas separator is divided into an upper chamber. With the lower chamber, the outlet of the soft oil tank is connected with the oil inlet of the upper end of the oil and gas separator through the oil pump, and the oil outlet of the lower end of the oil and gas separator is connected to the engine oil inlet through a check valve; the upper end cover of the oil and gas separator has an inlet port. Fuel port and exhaust port; this solution can adapt to the UAV's large maneuvering flight attitude, especially when diving and pulling up to go around, the fuel system can supply pure fuel to the engine stably and reliably. However, an additional oil pump is required between the soft oil tank and the oil-gas separator set in this solution, which will also increase the weight of the drone, which is not conducive to light weight.

The invention patent with publication number CN111137462A discloses a large-scale cargo unmanned aerial vehicle fuel system. The fuel system includes a first fuel supply system and a second fuel supply system, which can actively adjust the fuel supply pressure and has redundant backup. Oil supply and delivery system with excellent safety performance. However, the two oil supply systems set up in this scheme will increase the weight of the drone, which is not conducive to light weight.

It is not difficult to see that, on the one hand, the conventional UAV fuel system has a large number of components, which leads to a large weight, which is not conducive to the configuration of more loads for the UAV; The problem of overflow from the exhaust valve and poor fuel supply, and the problem of poor fuel supply when the fuel quantity is low. Some existing technical solutions cannot effectively solve the problem of oil spillage or poor fuel supply in the fuel system when the UAV is tilted and pitched at a large angle while ensuring the lightweight of the UAV.

SUMMARY OF THE INVENTION

In view of this, the utility model provides an unmanned aerial vehicle fuel system which can effectively improve the oil spill phenomenon of the fuel system when the unmanned aerial vehicle is tilted and pitched at a large angle while ensuring the lightweight of the unmanned aerial vehicle.

The unmanned aerial vehicle fuel system provided by the utility model includes an oil storage tank, a fuel supply tank, an air intake check valve and a rollover protection valve. The oil tank is communicated with the oil supply tank, the intake check valve and the rollover protection valve are arranged on the oil storage tank, and the intake check valve and the rollover protection valve are used for oil storage The fuel tank provides fresh air and the rollover valve is used to prevent fuel spillage.

Further, the volume of the oil storage tank is larger than the volume of the oil supply tank.

Further, the oil storage tank and the fuel supply tank are two independent fuel tanks, and the unmanned aerial vehicle fuel system further includes an oil pipe and a ventilation pipe, and the oil pipe connects the lower part of the oil storage tank with the supply pipe. In the upper part of the oil tank, the lower end of the ventilation pipe is communicated with the oil supply tank, and the upper end of the ventilation pipe extends to the upper part of the oil storage tank.

Further, the oil storage tank and the oil supply tank are integrally formed and communicated with each other, and the oil supply tank is arranged at the bottom of the oil storage tank.

Further, the unmanned aerial vehicle fuel system further includes an oil hammer, which is arranged in the fuel supply tank and is located at the lower end of the pipeline leading to the outside of the fuel supply tank, and is used for removing the fuel from the fuel supply tank. Oil sucks at the bottom.

Further, the unmanned aerial vehicle fuel system also includes a first liquid level sensor and/or a second liquid level sensor, the first liquid level sensor is used to detect the fuel level of the oil storage tank, and the second liquid level sensor is used to detect the fuel level of the fuel storage tank. The level sensor is used to detect the fuel level of the fuel supply tank.

Further, the unmanned aerial vehicle fuel system also includes a fuel pump and a fuel filter, the fuel pump is connected to the fuel supply tank and the fuel filter through a pipeline, and the fuel pump is used to The fuel in the fuel supply tank is delivered to the fuel filter, and the fuel filter is used to filter the fuel.

Further, the unmanned aerial vehicle fuel system also includes a fuel injector and a fuel pressure regulating valve, the fuel injector is connected to the fuel filter through a pipeline, and the fuel pressure regulating valve is arranged in the On the pipeline between the fuel injector and the fuel storage tank, the fuel injector is used to inject fuel according to the working conditions of the engine, and the fuel pressure regulating valve is used to control the fuel pressure in the pipeline.

Further, the unmanned aerial vehicle fuel system further includes a first flow sensor and/or a second flow sensor, and the first flow sensor is arranged on the pipeline between the fuel filter and the fuel injector, The first flow sensor is used to detect the flow of fuel in the pipeline after filtering, the second flow sensor is arranged on the pipeline between the fuel pressure regulating valve and the oil storage tank, the second flow The sensor is used to detect the fuel flow that flows back to the fuel storage tank after fuel injection in the pipeline.

Further, the unmanned aerial vehicle fuel system further includes a refueling plug, the refueling plug is arranged on the oil storage tank, and the oil storage tank is refueled through the refueling plug.

To sum up, the UAV fuel system of the present invention stores and supplies fuel through large and small oil storage tanks and fuel supply tanks, with simple and convenient processing, production, assembly and maintenance, and low cost. The oil tank adopts pure mechanical gravity oil delivery through the oil delivery pipe, and the oil storage tank in the utility model is also provided with a one-way intake valve and a rollover protection valve, which can balance low pressure, eliminate overpressure and perform rollover protection for the fuel system, When the UAV is tilted and pitched, the fuel does not overflow, which eliminates potential safety hazards and environmental pollution.

The above description is only an overview of the technical solution of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious It is easy to understand, the preferred embodiments are given below, and the detailed description is as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a UAV fuel system provided by the present invention.

FIG. 2 is a schematic diagram of another embodiment of the oil storage tank and the oil supply tank in the present invention.

Detailed ways

In order to further illustrate the technical means and effects adopted by the present utility model to achieve the predetermined purpose of the invention, the present utility model is described in detail as follows with reference to the accompanying drawings and preferred embodiments.

The unmanned aerial vehicle fuel system of the utility model is located in the unmanned aerial vehicle.

Please refer to FIG. 1 , the fuel system of the UAV of the present utility model includes a fuel storage tank 1, a fuel supply tank 2, an air intake check valve 6 and a rollover protection valve 7, and the fuel storage tank 1 is communicated with the fuel supply tank 2, and the fuel supply The fuel tank 2 is lower than the fuel storage tank 1 in spatial arrangement. The intake check valve 6 and the rollover protection valve 7 are arranged on the fuel storage tank 1. The intake check valve 6 and the rollover protection valve 7 are used for the fuel storage tank 1. Fresh air is supplied, and rollover valve 7 is used to prevent fuel spillage. In this embodiment, the volume of the fuel storage tank 1 is larger than the volume of the fuel supply tank 2. The fuel storage tank 1 with a larger volume is used to store fuel and ensure the cruising range, and the fuel supply tank 2 with a smaller volume is used during flight. Fuel the engine. The small-volume fuel supply tank 2 can prevent the influence of fuel foam on the fuel supply stability, and can also reduce the dead fuel weight of the fuel system, maximize the available fuel, and reduce the unusable residual fuel. Since the fuel supply tank 2 is lower than the fuel storage tank 1 in spatial arrangement, the fuel supply tank 2 can always be in a full state, and the fuel storage tank 1 can use pure mechanical gravity fuel delivery when delivering fuel to the fuel supply tank 2 , the structure is simple and reliable, and the lightweight of the fuel system is realized at the same time.

Specifically, since the fuel supply tank 2 is communicated with the fuel storage tank 1, it can balance the internal pressure of the fuel tank with the outside atmosphere through the intake check valve 6 of the fuel storage tank 1. The intake check valve 6 and the rollover protection valve 7 It can balance the negative pressure generated by pumping out the fuel and provide fresh air. The rollover protection valve 7 can also eliminate the overpressure caused by fuel preheating by discharging the gas generated in the fuel storage tank 1. If the fuel system is in an inclined position, the rollover protection valve 7. It can also close the exhaust port under the action of gravity to ensure that the drone does not overflow when tilting and pitching, and at this time, the intake check valve 6 still balances the internal pressure of the fuel tank, eliminating potential safety hazards and environmental pollution .

In this embodiment, the oil storage tank 1 and the fuel supply tank 2 are two independent fuel tanks. The fuel system of the UAV of the present invention also includes an oil delivery pipe 3 and a ventilation pipe 4. The gas pipe 4 is communicated with the fuel supply tank 2, the fuel delivery pipe 3 connects the lower part of the fuel storage tank 1 and the upper part of the fuel supply tank 2, the lower end of the ventilation pipe 4 is communicated with the fuel supply tank 2, and the upper end of the ventilation pipe 4 extends to the fuel storage tank 1 In other words, the oil storage tank 1 delivers oil to the oil supply tank 2 through the oil delivery pipe 3, and the oil supply tank 2 discharges oil and gas to the oil storage tank 1 through the breather pipe 4, that is, the breather pipe 4 can balance the oil storage tank 1 and the oil storage tank 1. The pressure in the fuel supply tank 2 is used as the expansion oil pipe of the fuel supply tank 2 when necessary, to ensure that the fuel generated by the thermal expansion of the fuel supply tank 2 can return to the fuel storage tank 1, so as to prevent the fuel supply tank 2 from being burst due to thermal expansion. .

Please refer to FIG. 2 together. In another embodiment of the present invention, the oil storage tank 1 and the oil supply tank 2 are integrally formed and communicated with each other, and the oil supply tank 2 is arranged at the bottom of the oil storage tank 1. In this embodiment , the oil delivery pipe 3 for oil delivery and the ventilation pipe 4 for ventilation are omitted, and the fuel supply tank 2 directly passes through the air intake check valve 6 on the oil storage tank 1 to balance the internal pressure of the fuel tank, and the oil storage tank 1 and the supply The integrated design of fuel tank 2 makes the overall lightweight of the fuel system even higher. However, this design has higher requirements on the arrangement space of the fuel tank and is not suitable for all UAVs.

Further, the unmanned aerial vehicle fuel system of the present invention also includes a first liquid level sensor 1a and/or a second liquid level sensor 2a, the first liquid level sensor 1a is used to detect the fuel level height of the oil storage tank 1, the first liquid level sensor 1a The two liquid level sensors 2a are used to detect the fuel level of the fuel supply tank 2 . In this embodiment, the first liquid level sensor 1a and the second liquid level sensor 2a are both ultrasonic sensors, and the readings of the first liquid level sensor 1a and the second liquid level sensor 2a can be used to evaluate the fuel storage in the fuel storage tank 1 and battery life.

Further, the unmanned aerial vehicle fuel system of the present invention also includes a fuel pump 8 and a fuel filter 9. The fuel pump 8 is connected to the fuel supply tank 2 and the fuel filter 9 through pipelines, respectively. The fuel pump 8 is used to The fuel in the fuel supply tank 2 is sent to the fuel filter 9, and the fuel filter 9 is used to filter the fuel.

Further, the unmanned aerial vehicle fuel system of the present invention also includes an oil hammer 2b, which is arranged in the fuel supply tank 2 and is located at the lower end of the pipeline outside the fuel supply tank 2, and communicates with the fuel pump 8 through the pipeline, The oil hammer 2b can suck oil from the bottom of the fuel supply tank under the action of gravity, so as to ensure that the fuel pump 8 can pump oil on demand in each flight attitude.

Further, the unmanned aerial vehicle fuel system of the present invention also includes a fuel injector 10 and a fuel pressure regulating valve 11. The fuel injector 10 is connected to the fuel filter 9 through a pipeline, and the fuel pressure regulating valve 11 is arranged in the fuel injector. On the pipeline between the fuel injector 10 and the fuel storage tank 1, the fuel injector 10 is used to inject fuel according to the engine operating conditions, and the fuel pressure regulating valve 11 is used to control the fuel pressure in the pipeline.

Further, the UAV fuel system of the present invention further includes a first flow sensor 12 and/or a second flow sensor 13, and the first flow sensor 12 is arranged on the pipeline between the fuel filter 9 and the fuel injector 10 , the first flow sensor 12 is used to detect the flow of fuel in the pipeline after filtering, the second flow sensor 13 is arranged on the pipeline between the fuel pressure regulating valve 11 and the oil storage tank 1, and the second flow sensor 13 is used to detect The fuel flow that flows back to the fuel storage tank 1 after fuel injection in the pipeline. If the difference between the first flow sensor 12 and the second flow sensor 13 is calculated without additional refueling, the overall consumption of fuel in the fuel system can be calculated, and the consumption of fuel in the fuel storage tank 1 can be calculated as The fuel system can be assessed for abnormalities such as oil spills.

Further, the unmanned aerial vehicle fuel system of the present invention further comprises a refueling plug 1b, the refueling plug 1b is arranged on the oil storage tank 1, and the oil storage tank 1 is refueled through the refueling plug 1b.

To sum up, the UAV fuel system of the present invention stores and supplies fuel through large and small oil storage tanks and fuel supply tanks, with simple and convenient processing, production, assembly and maintenance, and low cost. The oil tank adopts pure mechanical gravity oil delivery through the oil delivery pipe, and the oil storage tank in the utility model is also provided with a one-way intake valve and a rollover protection valve, which can balance low pressure, eliminate overpressure and perform rollover protection for the fuel system, When the UAV is tilted and pitched, the fuel does not overflow, which eliminates potential safety hazards and environmental pollution.

The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Professional and technical personnel, within the scope of the technical solution of the present invention, can make some changes or modifications to equivalent examples of equivalent changes by using the technical content disclosed above, provided that the content of the technical solution of the present invention is not departed from, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. An unmanned aerial vehicle fuel oil system which characterized in that: it includes fuel storage tank (1), fuel feeding tank (2), check valve (6) and the protection valve of overturning (7) admits air, fuel feeding tank (2) are less than in spatial arrangement fuel storage tank (1), fuel storage tank (1) with fuel feeding tank (2) intercommunication, admit air check valve (6) with the protection valve of overturning (7) set up in on fuel storage tank (1), admit air check valve (6) with the protection valve of overturning (7) are used for doing fuel storage tank (1) provides fresh air, the protection valve of overturning (7) are used for preventing the fuel to spill over.

2. The unmanned aerial vehicle fuel system of claim 1, wherein: the volume of the oil storage tank (1) is larger than that of the oil supply tank (2).

3. The unmanned aerial vehicle fuel system of claim 1, wherein: oil storage tank (1) with fuel feeding tank (2) are two independent oil tanks, unmanned aerial vehicle fuel system still includes defeated oil pipe (3) and breather pipe (4), defeated oil pipe (3) are connected the lower part of oil storage tank (1) with the upper portion of fuel feeding tank (2), the lower extreme of breather pipe (4) with fuel feeding tank (2) intercommunication, just the upper end of breather pipe (4) extends to the upper portion of oil storage tank (1).

4. The unmanned aerial vehicle fuel system of claim 1, wherein: oil storage tank (1) with fuel feeding tank (2) integrated into one piece and intercommunication each other, fuel feeding tank (2) set up in the bottom of oil storage tank (1).

5. An unmanned aerial vehicle fuel system as defined in claim 1, wherein: unmanned aerial vehicle fuel system still includes oil hammer (2b), oil hammer (2b) set up in fuel feeding oil tank (2) and be located lead to the outside pipeline lower extreme of fuel feeding oil tank (2) is used for following fuel suction is inhaled to fuel feeding oil tank (2) bottom.

6. The unmanned aerial vehicle fuel system of claim 1, wherein: unmanned aerial vehicle fuel system still includes first level sensor (1a) and/or second level sensor (2a), first level sensor (1a) are used for detecting the fuel liquid level height of oil storage tank (1), second level sensor (2a) are used for detecting the fuel liquid level height of fuel feeding tank (2).

7. The unmanned aerial vehicle fuel system of claim 1, wherein: unmanned aerial vehicle fuel system still includes fuel pump (8) and fuel filter (9), fuel pump (8) through the pipeline with fuel feeding oil tank (2) with fuel filter (9) are connected, fuel pump (8) be used for with fuel in fuel feeding oil tank (2) is carried extremely fuel filter (9), fuel filter (9) are used for filtering the fuel.

8. The unmanned aerial vehicle fuel system of claim 7, wherein: the unmanned aerial vehicle fuel system further comprises a fuel injector (10) and a fuel pressure regulating valve (11), the fuel injector (10) is connected with the fuel filter (9) through a pipeline, the fuel pressure regulating valve (11) is arranged on the pipeline between the fuel injector (10) and the fuel storage tank (1), the fuel injector (10) is used for injecting fuel according to the working condition of an engine, and the fuel pressure regulating valve (11) is used for controlling the fuel pressure in the pipeline.

9. The unmanned aerial vehicle fuel system of claim 8, wherein: unmanned aerial vehicle fuel system still includes first flow sensor (12) and/or second flow sensor (13), first flow sensor (12) set up in fuel filter (9) with on the pipeline between sprayer (10), first flow sensor (12) are used for detecting the interior fuel flow of pipeline after filtering, second flow sensor (13) set up in fuel pressure regulating valve (11) with on the pipeline between oil storage tank (1), flow back after second flow sensor (13) are used for detecting the interior oil spout of pipeline oil storage tank (1) the fuel flow.

10. The unmanned aerial vehicle fuel system of claim 1, wherein: unmanned aerial vehicle fuel system still includes filler plug (1b), filler plug (1b) set up in on oil storage tank (1), oil storage tank (1) passes through filler plug (1b) refuels.

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