A fire-fighting unmanned aerial vehicle for fire extinguishing

Abstract

The present invention relates to the field of drone fire fighting. The present invention discloses a fire extinguishing drone for fire fighting. The problem to be solved by the present invention is that existing drone devices carry water and fire extinguishing bombs for fire fighting by installing water bombs. When used in fire fighting, water is mostly projected into the fire area by projection. The way of projecting water is relatively single and cannot be adjusted according to the actual fire situation, so the effect is poor in the actual use process. The present invention can drive the water in the water single to project towards the fire area in the way of spraying and sprinkling through a control member, so as to provide different control modes for adjustment according to different situations.

Description

Technical Field

[0001] The present invention relates to the field of UAV fire fighting, and specifically to a fire fighting UAV for fire extinguishing. Background Art

[0002] The existing UAV field has developed rapidly, and UAVs have good expansion significance in various fields such as military, civilian, and maintenance. However, as a remote sensing device, UAVs can fly without discrimination regardless of the region and have good usability. In recent years, with the gradual acceleration of the urbanization process, the number of urban buildings has been continuously increasing. To address the urban building fire fighting problem, more and more fire extinguishing devices have been developed and put into use, such as fire extinguishing bombs. Therefore, a delivery device for delivering fire extinguishing bombs is also needed, such as a fire fighting UAV for delivering fire extinguishing bombs.

[0003] The existing patent (publication number: CN111891357B) discloses a fire fighting UAV for delivering fire extinguishing bombs, including a UAV fuselage. A fixed top plate is fixedly connected to the lower end surface of the UAV fuselage. A fixed connection column is connected to the lower end surface of the fixed top plate. An installation plate is fixedly connected to the lower end of the fixed connection column. A bomb storage box is arranged at the lower end of the installation plate. A fixed connecting rod is arranged on one side of the bomb storage box. A positioning buffer mechanism is connected to one side of the fixed connecting rod. The fire fighting UAV for delivering fire extinguishing bombs according to the present invention, through the cooperation of the push plate and the push launching mechanism, can project the fire extinguishing bomb in the horizontal direction, providing a support point for the UAV to deliver the fire extinguishing bomb from multiple directions, facilitating the UAV to stably deliver the fire extinguishing bomb and avoid shaking, further ensuring the accurate and stable delivery of the fire extinguishing bomb, improving the fire extinguishing efficiency, and having good practicability. In the process of implementing the present invention, the inventor found that at least the following problems in the existing technology have not been solved: the existing UAV equipment is installed with water bombs to carry water and fire extinguishing bombs for fire fighting. When used in fire fighting, water is mostly projected into the fire area. The way of projecting water is relatively single and cannot be adjusted according to the actual fire situation, so the effect is poor in the actual use process. Summary of the Invention

[0004] The purpose of the present invention is to provide a fire fighting UAV for fire extinguishing to solve the problems raised in the above background art. To achieve the above purpose, the present invention provides the following technical solution: a fire fighting UAV for fire extinguishing, including a UAV body. An installation bracket is fixedly connected to the bottom of the UAV body. A detection head is fixedly connected to the installation bracket. A fire fighting device is also arranged on the installation bracket. The fire fighting device is rotationally matched with the installation bracket.

[0005] Preferably, the fire-fighting equipment includes water bomb sheets arranged oppositely. A support rod is fixedly connected to the tops of the two water bomb sheets. The support rod is rotationally matched with the bottom of the mounting bracket. Sealing rubber strips are provided on both of the two water bomb sheets. When the two water bomb sheets are attached to each other, they form a water bomb for holding water. And the two water bomb sheets can prevent the stored water from leaking through the sealing rubber strips. The mounting bracket seals the tops of the two water bomb sheets. Water inlets are provided on the outer walls of the two water bomb sheets.

[0006] Preferably, a jet port is provided at the bottom of the water bomb formed when the two water bomb sheets are attached to each other. A control member for sealing the jet port is provided on the mounting bracket. The control member includes a driving motor fixedly arranged on the mounting bracket. A threaded rod is provided on the main shaft of the driving motor. A hollow limiting cylinder is fixedly connected to the mounting bracket. The threaded rod is arranged inside the hollow limiting cylinder. A moving column in screw fit is provided on the threaded rod. The moving column is slidably matched with the hollow limiting cylinder.

[0007] Preferably, a hinge frame is connected to the port of the moving column. The hinge frame is rotationally matched with the outer wall of the hollow limiting cylinder. A fixed bracket extending towards the jet port is fixedly connected to the hinge frame. The fixed bracket is made of an elastic material. A sealing rubber is provided on the fixed bracket. The sealing rubber corresponds to the size of the jet port and is used to seal the jet port.

[0008] Preferably, a driving frame is fixedly connected to the support rod on one of the water bomb sheets. A compression spring is provided between the driving frame and the bottom of the mounting bracket. One end of the driving frame extends towards the hollow limiting cylinder.

[0009] Preferably, a slideway is opened on the outer wall of the hollow limiting cylinder. A contact frame slidably matched with the slideway is provided on the outer wall of the moving column. The contact frame contacts with one end of the driving frame.

[0010] Preferably, driving plates are fixedly connected to both ends of the support rods on the two water bomb sheets. Card slots are opened on the driving plates. The driving plates arranged oppositely on the two support rods are arranged staggeredly. And limiting wheels are arranged in the card slots between the two driving plates.

[0011] Preferably, an air inlet duct is provided at the top of the UAV body. Two branch pipes connected in communication are connected to the bottom of the air inlet duct. One of the branch pipes passes through the mounting bracket and is arranged towards the inside of the water bomb. The other branch pipe is arranged towards the outside of the water bomb. And an electric ball valve is provided at the intersection of the two branch pipes.

[0012] Preferably, a rotating rod rotatably arranged is further provided at the bottom of the mounting bracket. The rotating rod is arranged towards the inside of the water bomb. A plurality of spiral fan blades are arranged around the circumference of the rotating rod.

[0013] Compared with the prior art, the beneficial effects of the present invention:

[0014] In the present invention, when the UAV body flies above a fire, if the fire area formed by the fire is small, the operator manipulates the driving motor through the handle to drive the threaded rod to rotate. The rotation of the threaded rod drives the moving column to move towards the position of the water bomb in the hollow limiting cylinder. At this time, the moving column drives the articulated frame to rotate, thereby causing the fixed bracket to move away from the spray port, separating the sealing rubber from the spray port, so that the water in the water bomb can be sprayed out through the spray port, more accurately spraying on the local area of the fire, effectively aiming at precise fire extinguishing at the local position.

[0015] In the present invention, during the flight of the UAV body, in order to prevent bumps from causing the separation of the two water bomb pieces and the leakage of the water in the water bomb, a pressure spring is arranged to contact the driving frame, and the driving frame is used to prevent the water in the water bomb from leaking out.

[0016] In the present invention, when the fire area formed by the fire is large, the operator drives the threaded rod to rotate through the handle to drive the moving column to move to the opposite side of the water bomb. When the moving column continuously moves and the contact frame contacts the driving frame, it should be noted that when the sealing rubber blocks the spray port during the flight of the UAV body, the contact frame will not contact the driving frame. As the moving column continuously moves to the opposite side of the water bomb, the fixed bracket deforms, and at this time the contact frame will touch the driving frame. After the contact frame contacts the driving frame, it will drive the driving frame to deflect. The driving frame drives one of the support rods to deflect, thereby driving one of the driving plates to deflect. The limiting wheel arranged in the card slot on the driving plate will drive the driving plate on the other support rod to deflect, thereby synchronously separating the two groups of water bomb pieces. The separation of the water bomb pieces spills the water in the water bomb to the part with a large fire area, achieving the effect of large-scale fire extinguishing. By setting the control part, different fire extinguishing methods are adopted according to the size of the fire, and different situations can be effectively dealt with during actual use.

[0017] In the present invention, the top of the installation bracket covers the top of the water bomb piece, which can prevent most gases from entering the water bomb. When the spray port is opened, the operator manipulates the electric ball valve to open the branch pipe located on the water bomb, and then uses the pressure of the wind to provide pressure for the water in the water bomb to quickly spray out through the spray port, achieving the effect of precise spraying. The electric ball valve and the driving motor are provided with receivers that receive the signals of the handle. By operating the handle, the operator can drive the forward and reverse rotation of the driving motor and the opening and closing of the electric ball valve.

[0018] In the present invention, when the water is sprayed from the water bomb to the fire area, the gravity of the water and the downward wind pressure of the branch pipe can cause the water flowing downward in the water bomb to rotate, thereby expanding the spraying range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ;

[0020] Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ;

[0021] Figure 3 Schematic diagram of the partial three-dimensional structure of the present invention;

[0022] Figure 4 State diagram of the partial three-dimensional structure of the present invention;

[0023] Figure 5 Schematic diagram of the partial three-dimensional structure of the present invention Figure 2 ;

[0024] Figure 6 Schematic diagram of the partial three-dimensional structure of the control part of the present invention;

[0025] Figure 7 Cross-sectional view of the partial three-dimensional structure of the control part of the present invention.

[0026] In the figure: 1, UAV body; 11, mounting bracket; 12, detection head; 2, fire-fighting equipment; 21, water bomb sheet; 22, support rod; 23, water bomb; 231, water inlet; 232, jet port; 3, control part; 31, drive motor; 32, threaded rod; 33, hollow limiting cylinder; 331, slideway; 34, moving column; 35, articulated frame; 36, fixed bracket; 361, sealing rubber; 4, drive frame; 41, pressure spring; 42, contact frame; 5, drive plate; 51, card slot; 52, limiting wheel; 6, air inlet duct; 61, branch pipe; 7, rotating rod; 71, spiral fan blade. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical staff in the art without creative work belong to the protection scope of the present invention.

[0028] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a fire-fighting UAV, including a UAV body 1, a mounting bracket 11 is fixedly connected to the bottom of the UAV body 1, a detection head 12 is fixedly connected to the mounting bracket 11, and a fire-fighting equipment 2 is further provided on the mounting bracket 11, and the fire-fighting equipment 2 is rotationally matched with the mounting bracket 11.

[0029] In this embodiment, asFigure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the fire fighting equipment 2 includes water bullets 21 arranged opposite to each other, the tops of the two water bullets 21 are fixedly connected with a support rod 22, the support rod 22 is rotatably matched with the bottom of the mounting bracket 11, and the two water bullets 21 are provided with sealing strips, and the two water bullets 21 form a water bullet 23 for holding water when they are attached, and the two water bullets 21 can prevent the contained water from leaking out through the sealing strips, the mounting bracket 11 seals the tops of the two water bullets 21, and the outer walls of the two water bullets 21 are provided with water inlets 231;

[0030] When encountering a fire, the operator pours water into the water bomb 21 in a fitted state through the water inlet 231 on the water bomb 21, and the formed water bomb 23 contains the water required for fire fighting. The operator drives the drone body 1 to fly towards the fire area through the handle.

[0031] In this embodiment, Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, a water bullet 23 formed when two water bullets 21 are attached is provided with a jet port 232 at the bottom, and a control member 3 for sealing the jet port 232 is provided on the mounting bracket 11, and the control member 3 includes a driving motor 31 fixedly arranged on the mounting bracket 11, and a threaded rod 32 is provided on the main shaft of the driving motor 31, and a hollow limiting cylinder 33 is fixedly connected to the mounting bracket 11, and the threaded rod 32 is arranged in the hollow limiting cylinder 33, and a spirally matched moving column 34 is provided on the threaded rod 32, and the moving column 34 is slidably matched with the hollow limiting cylinder 33;

[0032] The end of the movable column 34 is connected with an articulated frame 35, and the articulated frame 35 is rotatably matched with the outer wall of the hollow limiting cylinder 33. The articulated frame 35 is fixedly connected with a fixed bracket 36 extending toward the injection port 232. The fixed bracket 36 is made of elastic material and is provided with a sealing rubber 361. The size of the sealing rubber 361 is relatively large to the injection port 232 and is used to seal the injection port 232.

[0033] When the UAV body 1 flies above the fire, if the fire area formed by the fire is small, the operator manipulates the driving motor 31 through the handle to drive the driving motor 31 to drive the threaded rod 32 to rotate. When the threaded rod 32 rotates, it drives the moving column 34 to move towards the position of the water bomb 23 in the hollow limiting cylinder 33. At this time, the moving column 34 drives the hinge frame 35 to rotate, and then makes the fixed bracket 36 move away from the spray port 232, so that the sealing rubber 361 is separated from the spray port 232. Thus, the water in the water bomb 23 can be sprayed out through the spray port 232, more precisely spraying on the local area of the fire, effectively aiming at the precise fire fighting of the local position.

[0034] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, a support rod 22 on one of the water bomb pieces 21 is fixedly connected to a driving frame 4. A pressure spring 41 is provided between the driving frame 4 and the bottom of the mounting bracket 11. One end of the driving frame 4 extends towards the hollow limiting cylinder 33. During the flight of the UAV body 1, in order to avoid bumps causing the separation of the two water bomb pieces 21 and the water in the water bomb 23 leaking outwards, the pressure spring 41 is arranged to contact the driving frame 4, and the driving frame 4 is used to prevent the water in the water bomb 23 from leaking outwards.

[0035] In this embodiment, as Figure 6 and Figure 7 shown, a slideway 331 is opened on the outer wall of the hollow limiting cylinder 33, and a contact frame 42 that is slidably matched with the slideway 331 is provided on the outer wall of the moving column 34. The contact frame 42 contacts one end of the driving frame 4;

[0036] Both ends of the support rods 22 on the two water bomb pieces 21 are fixedly connected with driving plates 5. Card slots 51 are opened on the driving plates 5. The driving plates 5 arranged oppositely on the two support rods 22 are staggered, and a limiting wheel 52 is arranged in the card slots 51 between the two driving plates 5;

[0037] When the fire area formed by the fire is large, the operator uses the handle to drive the driving motor 31 to drive the threaded rod 32 to rotate, driving the moving column 34 to move to the opposite side of the water bomb 23. When the moving column 34 continuously moves and the contact frame 42 contacts the driving frame 4, it should be noted that when the sealing rubber 361 blocks the jet port 232 during the flight of the UAV body 1, the contact frame 42 will not contact the driving frame 4. As the moving column 34 continuously moves to the opposite side of the water bomb 23, the fixed bracket 36 deforms, and only then will the contact frame 42 touch the driving frame 4. After the contact frame 42 contacts the driving frame 4, it will drive the driving frame 4 to deflect. The driving frame 4 drives one of the support rods 22 to deflect, thereby driving one of the driving plates 5 to deflect. The limiting wheel 52 arranged in the card slot 51 on the driving plate 5 will drive the driving plate 5 on the other support rod 22 to deflect, thereby synchronously separating the two groups of water bomb pieces 21. The separation of the water bomb pieces 21 will then sprinkle the water in the water bomb 23 towards the area with a large fire, achieving the effect of extinguishing the fire over a large area. By setting the control member 3, different fire extinguishing methods are adopted according to the size of the fire, and different situations can be effectively targeted during actual use.

[0038] In this embodiment, as Figure 1 , Figure 2 and Figure 4 shown, an air inlet duct 6 is provided at the top of the UAV body 1. The bottom of the air inlet duct 6 is connected to two branch ducts 61 that are connected. One of the branch ducts 61 passes through the mounting bracket 11 and is arranged towards the inside of the water bomb 23, and the other branch duct 61 is arranged towards the outside of the water bomb 23. An electric ball valve is provided at the intersection of the two branch ducts 61;

[0039] The top of the mounting bracket 11 covers the top of the water bomb piece 21, which can prevent most gases from entering the water bomb 23. When the jet port 232 is opened, the operator controls the electric ball valve to open the branch duct 61 located on the water bomb 23, and then uses the pressure of the wind to provide pressure to the water in the water bomb 23 to make it quickly spray out through the jet port 232, achieving the effect of precise spraying. The electric ball valve and the driving motor 31 are provided with receivers that receive the signals of the handle. By operating the handle, the operator can drive the forward and reverse rotation of the driving motor 31 and the opening and closing of the electric ball valve.

[0040] In this embodiment, as Figure 1 , Figure 2 and Figure 4 shown, a rotating rod 7 is also rotatably provided at the bottom of the mounting bracket 11. The rotating rod 7 is arranged towards the inside of the water bomb 23, and a number of spiral fan blades 71 are arranged around the circumference of the rotating rod 7; By setting a number of spiral fan blades 71, when the water is sprayed from the water bomb 23 towards the fire area, the gravity of the water and the downward wind pressure of the branch duct 61 can cause the water flowing downward in the water bomb 23 to rotate, thereby expanding the spraying range.

[0041] Usage method and advantages of the present invention: The usage method of a fire-fighting unmanned aerial vehicle is as follows. The working process is as follows:

[0042] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown:

[0043] When a fire breaks out, the operator fills water into the water bomb sheet 21 in a fitting state through the water inlet 231 on the water bomb sheet 21, and forms a water bomb 23 to hold the water required for fire fighting. The operator drives the unmanned aerial vehicle body 1 towards the fire area through the handle;

[0044] During the flight of the unmanned aerial vehicle body 1, in order to prevent bumps from causing the separation of the two water bomb sheets 21 and the water in the water bomb 23 from leaking out, the pressure spring 41 is in contact with the driving frame 4, and the driving frame 4 prevents the water in the water bomb 23 from leaking out;

[0045] When the unmanned aerial vehicle body 1 flies above the fire, if the fire area formed by the fire is small, the operator manipulates the driving motor 31 through the handle to drive the threaded rod 32 to rotate. The rotation of the threaded rod 32 drives the moving column 34 to move towards the position of the water bomb 23 in the hollow limiting cylinder 33. At this time, the moving column 34 drives the articulated frame 35 to rotate, and then the fixed bracket 36 moves away from the spraying port 232, so that the sealing rubber 361 is separated from the spraying port 232, and the water in the water bomb 23 can be sprayed out through the spraying port 232, more precisely spraying on the local area of the fire, effectively aiming at the precise fire fighting of the local position;

[0046] When the fire area formed by the fire is large, the operator uses the handle to drive the driving motor 31 to drive the threaded rod 32 to rotate, driving the moving column 34 to move to the opposite side of the water bomb 23. When the moving column 34 continuously moves and the contact frame 42 contacts the driving frame 4, it should be noted that when the sealing rubber 361 blocks the jet port 232 during the flight of the UAV body 1, the contact frame 42 will not contact the driving frame 4. As the moving column 34 continuously moves to the opposite side of the water bomb 23, the fixed bracket 36 deforms, and only then will the contact frame 42 touch the driving frame 4. After the contact frame 42 contacts the driving frame 4, it will drive the driving frame 4 to deflect. The driving frame 4 drives one of the support rods 22 to deflect, thereby driving one of the driving plates 5 to deflect. The limiting wheel 52 arranged in the card slot 51 on the driving plate 5 will drive the driving plate 5 on the other support rod 22 to deflect, thereby synchronously separating the two groups of water bomb pieces 21. The separation of the water bomb pieces 21 will then sprinkle the water in the water bomb 23 to the area with a large fire, achieving the effect of extinguishing the fire over a large area. By setting the control member 3, different fire extinguishing methods are adopted according to the size of the fire, and it can be effectively used for different situations during actual use;

[0047] The top of the installation bracket 11 covers the top of the water bomb piece 21, which can prevent most gases from entering the water bomb 23. When the jet port 232 is opened, the operator controls the electric ball valve to open the branch pipe 61 located on the water bomb 23. Then, through the pressure of the wind, pressure is provided to the water in the water bomb 23 to make it quickly spray out through the jet port 232, achieving the effect of precise spraying. The electric ball valve and the driving motor 31 are equipped with receivers that receive the signals of the handle. By operating the handle, the operator can drive the forward and reverse rotation of the driving motor 31 and the opening and closing of the electric ball valve;

[0048] Through the arranged plurality of spiral fan blades 71, when the water is sprayed from the water bomb 23 into the fire area, the gravity of the water and the downward wind pressure of the branch pipe 61 can make the water in the water bomb 23 rotate when flowing downward, thereby expanding the spraying range.

[0049] The above shows and describes the basic principles, main features, and advantages of the present invention. Technical staff in this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and do not limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire - fighting unmanned aerial vehicle, Characterized in that: It includes an unmanned aerial vehicle body (1), a mounting bracket (11) is fixedly connected to the bottom of the unmanned aerial vehicle body (1), a detection head (12) is fixedly connected to the mounting bracket (11), a fire - fighting device (2) is also provided on the mounting bracket (11), and the fire - fighting device (2) is rotationally matched with the mounting bracket (11); The fire - fighting device (2) includes water - bomb sheets (21) arranged oppositely, a support rod (22) is fixedly connected to the top of the two water - bomb sheets (21), the support rod (22) is rotationally matched with the bottom of the mounting bracket (11), sealing rubber strips are provided on both of the two water - bomb sheets (21), when the two water - bomb sheets (21) are attached, they form a water - bomb (23) for holding water, and the two water - bomb sheets (21) can prevent the water from leaking out through the sealing rubber strips, the mounting bracket (11) seals the tops of the two water - bomb sheets (21), and water inlets (231) are provided on the outer walls of the two water - bomb sheets (21); A spray port (232) is provided at the bottom of the water - bomb (23) formed when the two water - bomb sheets (21) are attached, a control member (3) for sealing the spray port (232) is provided on the mounting bracket (11), the control member (3) includes a driving motor (31) fixedly arranged on the mounting bracket (11), a threaded rod (32) is provided on the main shaft of the driving motor (31), a hollow limiting cylinder (33) is fixedly connected to the mounting bracket (11), the threaded rod (32) is arranged inside the hollow limiting cylinder (33), a moving column (34) in screw - fit with the threaded rod (32) is provided on the threaded rod (32), and the moving column (34) is slidably matched with the hollow limiting cylinder (33); A hinge frame (35) is connected to the port of the moving column (34), the hinge frame (35) is rotationally matched with the outer wall of the hollow limiting cylinder (33), a fixed bracket (36) extending towards the spray port (232) is fixedly connected to the hinge frame (35), the fixed bracket (36) is made of an elastic material, and a sealing rubber (361) is provided on the fixed bracket (36), and the sealing rubber (361) has a size corresponding to that of the spray port (232) for sealing the spray port (232).

2. The fire - fighting unmanned aerial vehicle according to claim 1, Characterized in that: A driving frame (4) is fixedly connected to the support rod (22) on one of the water - bomb sheets (21), a compression spring (41) is provided between the driving frame (4) and the bottom of the mounting bracket (11), and one end of the driving frame (4) extends towards the direction of the hollow limiting cylinder (33).

3. The fire - fighting unmanned aerial vehicle according to claim 2, Characterized in that: A slideway (331) is opened on the outer wall of the hollow limiting cylinder (33), a contact frame (42) slidably matched with the slideway (331) is provided on the outer wall of the moving column (34), and the contact frame (42) contacts with one end of the driving frame (4).

4. The fire - fighting unmanned aerial vehicle according to claim 1, Characterized in that: Both ends of the support rods (22) on the two water bomb pieces (21) are fixedly connected with drive plates (5). Slots (51) are formed in the drive plates (5). The drive plates (5) arranged oppositely on the two support rods (22) are staggered, and a limiting wheel (52) is arranged in the slot (51) between the two drive plates (5).

5. A fire-fighting unmanned aerial vehicle according to claim 1, characterized in that: An air inlet duct (6) is provided at the top of the unmanned aerial vehicle body (1). The bottom of the air inlet duct (6) is connected with two branch ducts (61) which are communicated with each other. One of the branch ducts (61) passes through the mounting bracket (11) and is arranged towards the inside of the water bomb (23), and the other branch duct (61) is arranged towards the outside of the water bomb (23). An electric ball valve is provided at the intersection of the two branch ducts (61).

6. A fire-fighting unmanned aerial vehicle according to claim 1, characterized in that: A rotating rod (7) is rotatably provided at the bottom of the mounting bracket (11). The rotating rod (7) is arranged towards the inside of the water bomb (23), and a plurality of spiral fan blades (71) are arranged around the circumference of the rotating rod (7).

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