Fire-fighting unmanned aerial vehicle foam generating system

Abstract

The invention provides a fire-fighting unmanned aerial vehicle foam generating system which comprises an unmanned aerial vehicle, an injection pipe and a balance fan are arranged at the bottom of the unmanned aerial vehicle, the injection pipe is slidably connected with the unmanned aerial vehicle, an output hose is arranged between the injection pipe and a foaming bin and comprises a water spraying pipe and a supporting air pipe, and the balance fan comprises an adjusting valve, a pneumatic screwdriver and a balance propeller. An air inlet of the adjusting valve communicates with the supporting air pipe, a first air outlet communicates with the external environment, a second air outlet communicates with the pneumatic screwdriver, and the pneumatic screwdriver is connected with the balance propeller. According to the foam generating system of the unmanned aerial vehicle for fire fighting, the air compressor of the system provides compressed air and compressed air foam for fire extinguishing, the injection pipe extrudes the adjusting valve through recoil force, so that the balance propeller arranged at the output end of the pneumatic screwdriver rotates to generate corresponding recoil force to balance the recoil force of the injection pipe, and the foam generating effect is achieved. The adjusting valve adjusts the rotating speed of the balance propeller in real time according to the recoil force, so that the position of the unmanned aerial vehicle at high altitude is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of fire fighting equipment, and in particular to a foam generating system of a drone for fire fighting. Background Art

[0002] As a new industrial technology, drone firefighting has been widely used in various fields. Many firefighting agencies in China have successfully used drones to conduct fire scene reconnaissance and monitoring, and to drop rescue materials, with very obvious results. However, the technology of directly spraying firefighting water or firefighting foam at high altitudes by drones is still slightly insufficient. The main reason is that drones carry firefighting pipes to high altitudes. Firefighting pipes and firefighting liquids in firefighting pipes have a certain weight, which puts a particularly large load on drones. In particular, the recoil force generated during the spraying of firefighting liquids makes it impossible for the drone to maintain a stable position and the spraying point cannot be accurately aimed at the fire source, resulting in the inability to control the fire danger in time to stop the loss. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the shortcomings in the prior art that a UAV carries a fire hose and flies to a high altitude, the fire hose and the fire-fighting liquid in the fire hose have a certain weight, which imposes a particularly large load on the UAV, especially the recoil force generated during the spraying of the fire-fighting liquid, which makes it impossible to maintain a stable position of the UAV and the spraying point cannot be accurately aimed at the fire source, thus resulting in the inability to timely control the fire hazard and stop the loss. The present invention provides a foam generating system for a UAV for firefighting.

[0004] The technical solution to be adopted by the present invention to solve its technical problem is: a foam generating system for a fire-fighting drone, comprising a gasoline engine, a water pump, a foam pump and an air compressor arranged on a base, a plurality of movable rollers being arranged at the lower end of the base, an output end of the gasoline engine being transmission-connected with a power input end of the water pump, the foam pump and the air compressor, and the output ends of the water pump, the foam pump and the air compressor being connected with a foaming bin, and also comprising a drone, a spray pipe and a balancing fan being arranged at the bottom of the drone, the spray pipe being slidingly connected with the drone in a horizontal direction, a nozzle being arranged at one end of the spray pipe extending out of the drone, an output hose being arranged between the spray pipe and the foaming bin, the output hose comprising a water spray pipe and a supporting air pipe spirally arranged along the water spray pipe, The balancing fan includes a regulating valve, a pneumatic screwdriver and a balancing propeller. The regulating valve is arranged on a side of the injection pipe away from the nozzle and is fixedly connected to the bottom of the drone. The regulating valve is provided with a valve stem arranged toward the injection pipe, and the valve stem is coaxially arranged with the injection pipe. The part of the valve stem arranged on the outside of the valve seat is sleeved with a supporting spring, one end of the supporting spring is fixedly connected to the end of the valve stem, and the other end is fixedly connected to the valve seat. One end of the supporting air pipe is connected to the air compressor, and the other end is connected to the air inlet of the regulating valve. The regulating valve is provided with a first air outlet and a second air outlet, the first air outlet is connected to the external environment, the second air outlet is connected to the pneumatic screwdriver, the output end of the pneumatic screwdriver is connected to the balancing propeller, the balancing propeller is coaxially arranged with the injection pipe, and the valve stem is provided with a valve core for adjusting the opening size of the first air outlet and the second air outlet.

[0005] The gasoline engine is used to drive the water pump, foam pump and air compressor to operate. The water pump is used to press fire water into the foaming chamber, and the foam pump is used to press foam agent into the foaming chamber. The compressed air generated by the air compressor is used to support the air pipe in one way, and the other way is mixed with the water of the water pump and the foam agent of the foam pump in the foaming chamber to produce compressed air foam, which is then sprayed to the fire source through the water spray pipe and the spray pipe installed on the drone; when the drone is flying, the supporting air pipe is quickly erected to support the erected output hose, thereby reducing the flight burden of the drone, allowing the drone to fly higher and increasing the firefighting range; the supporting spring is used to fully extend the valve stem. When the valve stem is fully extended, the air inlet of the regulating valve is connected to the first air outlet, and the air inlet is not connected to the second air outlet. There is no airflow passing through the second air outlet, and the pneumatic screwdriver and the balancing propeller are not started; When compressed air foam is ejected from the jet pipe at high pressure, a certain recoil force will be generated, affecting the flight stability of the UAV; the jet pipe is slidably connected to the UAV, and the recoil force of the compressed air foam ejected at high pressure on the jet pipe is used to enable the jet pipe to overcome the elastic force of the supporting spring and compress the valve stem, and the valve stem drives the valve core to move, gradually closing the first air outlet and gradually opening the second air outlet. The greater the recoil force, the greater the opening of the second air outlet, and the faster the speed of the pneumatic screwdriver, so that the balancing propeller generates corresponding back-blowing force to balance the recoil force of the jet pipe.

[0006] Furthermore, a sliding sleeve is provided at the center position of the lower end of the drone, the injection pipe is slidably connected to the sliding sleeve, a plurality of sealing rings cooperating with the injection pipe are provided on the inner wall surface of the sliding sleeve, a connecting hole is provided on the sliding sleeve, a quick-connect joint cooperating with the end of the water spray pipe is provided at the connecting hole, a water inlet hole is provided on the side wall of the injection pipe, the diameter of the water inlet hole is smaller than the diameter of the connecting hole, and a limiting ring is provided on the outer wall surface of the injection pipe to ensure that the water inlet hole is always connected with the connecting hole.

[0007] The sliding sleeve and the water inlet pipe are arranged at the center of the UAV to prevent the center of gravity of the UAV from tilting and ensure the stability of the UAV flight; the limit ring is used to limit the sliding range of the injection pipe. When the injection pipe slides in the sliding sleeve under the influence of the recoil force, it ensures that the water inlet hole is always connected with the connecting hole to ensure that the compressed air foam is normally ejected from the injection pipe.

[0008] Furthermore, the supporting air pipes are mutually supported, and a plurality of inflation nozzles are arranged at intervals on the supporting air pipes, and a clamp for cutting off the supporting air pipes is sleeved on the output hose. High-pressure air can be filled into the supporting air pipes through any inflation nozzle, and there will be no air leakage from the inflation nozzles. According to the altitude at which the UAV needs to fly, the clamp is clamped at the corresponding position of the output hose to cut off the supporting air pipe, and when inflated through the corresponding inflation nozzle, the supporting air pipe close to the UAV side is quickly filled with high-pressure air, and the opposed output hose plays a role of rapid support, while the supporting air pipe close to the gasoline engine side does not have gas inflow due to the existence of the clamp. The clamp will not affect the normal use of the water spray pipe when in use.

[0009] Furthermore, a water spray valve for adjusting the water flow rate is provided on the spray pipe, and the water spray valve is controlled by a controller to adjust the compressed air foam spraying speed.

[0010] Furthermore, the first air outlet is arranged vertically downward. During the take-off of the UAV, the pressure of the compressed air foam ejected from the jet pipe is small, and the squeezing force of the jet pipe on the valve stem of the regulating valve is also small. A small portion of the high-pressure air entering from the air inlet of the regulating valve is blown out from the second air outlet to drive the balancing propeller to rotate slowly, providing a back-blowing force equivalent to the pressure of the compressed air foam. Most of the high-pressure air is blown out from the first air outlet to provide an upward thrust to the UAV, which can reduce the lift load of the UAV and enable the UAV to fly higher.

[0011] The beneficial effects of the present invention are as follows: a foam generating system for a fire-fighting drone provided by the present invention adopts an air compressor, a water pump, and a foam pump to cooperate with each other to deliver high-pressure fire-fighting foam. The drone lifts the output hose to a high altitude, and the supporting air pipe supports the output hose when it is inflated, thereby reducing the flight load of the drone; when the drone sprays compressed air foam through the injection pipe, the injection pipe squeezes the regulating valve through the recoil force, thereby starting the screwdriver, so that the balancing propeller arranged at the output end of the pneumatic screwdriver rotates to generate a corresponding back-blowing force to balance the recoil force of the injection pipe, and the regulating valve adjusts the rotation speed of the balancing propeller in real time according to the size of the recoil force, so that the position of the drone at a high altitude is stable, thereby stably spraying the compressed air foam onto the fire source point. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1It is a structural schematic diagram of the best embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the UAV; Figure 3 It is a structural diagram of a regulating valve; Figure 4 It is a schematic diagram of the structure of the output hose.

[0014] In the figure: 1. gasoline engine, 2. air compressor, 3. base, 4. foaming chamber, 5. drone, 6. jet pipe, 61. nozzle, 62. water inlet, 63. limit ring, 7. balancing fan, 71. regulating valve, 711. valve stem, 712. support spring, 713. air inlet, 714. first air outlet, 715. second air outlet, 716. valve core, 72. pneumatic screwdriver, 73. balanced propeller, 8. output hose, 81. water spray pipe, 82. support air pipe, 821. inflation nozzle, 83. clamp, 9. sleeve, 91. connecting hole, 10. quick connector. DETAILED DESCRIPTION

[0015] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0016] like Figure 1-4 As shown, a foam generating system of a fire-fighting drone of the present invention comprises a gasoline engine 1, a water pump, a foam pump and an air compressor 2 arranged on a base 3, a plurality of movable rollers are arranged at the lower end of the base 3, the output end of the gasoline engine 1 is transmission-connected with the power input end of the water pump, the foam pump and the air compressor 2, and the output ends of the water pump, the foam pump and the air compressor 2 are all connected with the foaming chamber 4. It has small size, light weight, high pressure, large flow, no need for external power supply, flexible movement and reliable operation. It can be used for large petrochemical fire scene or high-rise building fire fighting.

[0017] The invention also includes a drone 5, wherein a spray pipe 6 and a balancing fan 7 are provided at the bottom of the drone 5, wherein the spray pipe 6 is slidably connected to the drone 5 in the horizontal direction, and a spray head 61 is provided at one end of the spray pipe 6 extending out of the drone 5, and an output hose 8 is provided between the spray pipe 6 and the foaming chamber 4, wherein the output hose 8 includes a water spray pipe 81 and a supporting air pipe 82 spirally arranged along the water spray pipe 81. The balancing fan 7 includes a regulating valve 71, a pneumatic screwdriver 72 and a balancing propeller 73. The regulating valve 71 is arranged on the side of the injection pipe 6 away from the nozzle 61 and is fixedly connected to the bottom of the drone 5. The regulating valve 71 is provided with a valve stem 711 arranged toward the injection pipe 6. The valve stem 711 is coaxially arranged with the injection pipe 6. The part of the valve stem 711 arranged on the outside of the valve seat is sleeved with a support spring 712. One end of the support spring 712 is fixedly connected to the end of the valve stem 711, and the other end is fixedly connected to the valve seat. One end of the support air pipe 82 It is connected to the air compressor 2, and the other end is connected to the air inlet 713 of the regulating valve 71. The regulating valve 71 is provided with a first air outlet 714 and a second air outlet 715. The first air outlet 714 is connected to the external environment, and the second air outlet 715 is connected to the pneumatic screwdriver 72. The output end of the pneumatic screwdriver 72 is connected to the balancing propeller 73, and the balancing propeller 73 is coaxially arranged with the injection pipe 6. The valve stem 711 is provided with a valve core 716 for adjusting the opening size of the first air outlet 714 and the second air outlet 715.

[0018] A sliding sleeve 9 is provided at the center position of the lower end of the drone 5, and the injection pipe 6 is slidably connected to the sliding sleeve 9. A plurality of sealing rings cooperating with the injection pipe 6 are provided on the inner wall surface of the sliding sleeve 9. A connecting hole 91 is provided on the sliding sleeve 9, and a quick-connect joint 10 cooperating with the end of the water spray pipe 81 is provided at the connecting hole 91. A water inlet hole 62 is provided on the side wall of the injection pipe 6, and the diameter of the water inlet hole 62 is smaller than the diameter of the connecting hole 91. A limiting ring 63 is provided on the outer wall surface of the injection pipe 6 to ensure that the water inlet hole 62 is always connected to the connecting hole 91.

[0019] The supporting air pipes 82 are mutually supported and abutted against each other. A plurality of inflation nozzles 821 are arranged at intervals on the supporting air pipes 82 . A clamp 83 for cutting off the supporting air pipes 82 is sleeved on the output hose 8 .

[0020] The spray pipe 6 is provided with a water spray valve for adjusting the water flow rate.

[0021] The first air outlet 714 is disposed vertically downward.

[0022] Working process: Assuming that the height of the fire source is about 50 meters, the UAV needs to fly to a height of 60 meters. The firefighter fixes the clamp 83 at 60 meters of the output hose 8. When the UAV 5 takes off, high-pressure air is filled into the support air pipe 82 through the inflation nozzle 821 closest to the clamp 83. The support air pipes 82 swell and support each other, and support the erected output hose 8 to reduce the flight burden of the UAV 5. The gasoline engine 1 provides power to the air compressor, water pump, and foam pump. After the high-pressure air, water, and foam agent are mixed in the foaming chamber 4, the compressed air foam is pressed into the water spray pipe 81, and the compressed air foam is sprayed out from the spray pipe 6. When the UAV 5 flies to the corresponding height of the fire source, the air compressor 82 is powered. The output power of the large gasoline engine 1, the air compressor, the water pump, and the foam pump causes the compressed air foam to be ejected from the injection pipe 6 at a high speed; when the compressed air foam is ejected, the injection pipe 6 is affected by the recoil force to squeeze the valve stem 711 of the regulating valve 71, and the valve stem 711 drives the valve core 716 to move, gradually closing the first air outlet 714, and gradually opening the second air outlet 715. The greater the pressure of the compressed air foam ejected from the injection pipe 6, the greater the opening of the second air outlet 715, and the faster the speed of the pneumatic screwdriver 72, so that the balancing propeller 73 generates a corresponding back-blowing force to balance the recoil force of the injection pipe 6, thereby keeping the drone 5 balanced in the horizontal direction and stably spraying fire foam on the fire source.

[0023] Directions and references (e.g., up, down, left, right, etc.) in the present invention may only be used to assist in the description of features in the accompanying drawings. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0024] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A foam generating system for a fire-fighting drone, comprising a gasoline engine (1), a water pump, a foam pump and an air compressor (2) arranged on a base (3), a plurality of movable rollers being arranged at the lower end of the base (3), an output end of the gasoline engine (1) being transmission-connected to power input ends of the water pump, the foam pump and the air compressor (2), and output ends of the water pump, the foam pump and the air compressor (2) being connected to a foaming chamber (4), characterized in that: It also comprises an unmanned aerial vehicle (5), wherein a spray pipe (6) and a balancing fan (7) are provided at the bottom of the unmanned aerial vehicle (5), the spray pipe (6) is slidably connected to the unmanned aerial vehicle (5) in a horizontal direction, a spray head (61) is provided at one end of the spray pipe (6) extending out of the unmanned aerial vehicle (5), an output hose (8) is provided between the spray pipe (6) and the foaming chamber (4), the output hose (8) comprises a water spray pipe (81) and a supporting air pipe (82) spirally arranged along the water spray pipe (81), The balancing fan (7) comprises a regulating valve (71), a pneumatic screwdriver (72) and a balancing propeller (73); the regulating valve (71) is arranged on a side of the jet pipe (6) away from the nozzle (61) and is fixedly connected to the bottom of the drone (5); the regulating valve (71) is provided with a valve stem (711) arranged in the direction of the jet pipe (6); the valve stem (711) and the jet pipe (6) are coaxially arranged; a portion of the valve stem (711) arranged outside the valve seat is sleeved with a support spring (712); one end of the support spring (712) is fixedly connected to the end of the valve stem (711) and the other end is fixedly connected to the valve seat; the support air pipe (82) is provided with a valve stem (711) disposed in a direction toward the jet pipe (6); the valve stem (711) and the jet pipe (6) are coaxially arranged; a portion of the valve stem (711) disposed outside the valve seat is sleeved with a support spring (712); one end of the support spring (712) is fixedly connected to the end of the valve stem (711) and the other end is fixedly connected to the valve seat; One end is connected to the air compressor (2), and the other end is connected to the air inlet (713) of the regulating valve (71). The regulating valve (71) is provided with a first air outlet (714) and a second air outlet (715). The first air outlet (714) is connected to the external environment, and the second air outlet (715) is connected to the pneumatic screwdriver (72). The output end of the pneumatic screwdriver (72) is connected to a balancing propeller (73). The balancing propeller (73) is coaxially arranged with the injection pipe (6). The valve stem (711) is provided with a valve core (716) for adjusting the opening size of the first air outlet (714) and the second air outlet (715).

2. A foam generating system for a drone for fire fighting as claimed in claim 1, characterized in that: A sliding sleeve (9) is provided at the center of the lower end of the drone (5); the jet pipe (6) is slidably connected to the sliding sleeve (9); a plurality of sealing rings cooperating with the jet pipe (6) are provided on the inner wall surface of the sliding sleeve (9); a connecting hole (91) is provided on the sliding sleeve (9); a quick-connect joint (10) cooperating with the end of the water jet pipe (81) is provided at the connecting hole (91); a water inlet hole (62) is provided on the side wall of the jet pipe (6); the diameter of the water inlet hole (62) is smaller than the diameter of the connecting hole (91); and a limiting ring (63) is provided on the outer wall surface of the jet pipe (6) for ensuring that the water inlet hole (62) is always connected to the connecting hole (91).

3. A foam generating system for a drone for firefighting as claimed in claim 1, characterized in that: The supporting air pipes (82) are mutually abutted and supported, a plurality of inflation nozzles (821) are arranged at intervals on the supporting air pipe (82), and a clamp (83) for cutting off the supporting air pipe (82) is sleeved on the output hose (8).

4. A foam generating system for a drone for firefighting as claimed in claim 1, characterized in that: The spray pipe (6) is provided with a water spray valve for adjusting the water flow rate. The ground part not only provides the system with compressed air required by the pipeline, but also produces compressed air foam for fire extinguishing.

5. A foam generating system for a drone for firefighting as claimed in claim 1, characterized in that: The first air outlet (714) is arranged vertically downward.

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