A mixed fire extinguishing agent spraying structure for a fire-fighting unmanned aerial vehicle

Abstract

This invention discloses a mixed extinguishing agent spraying structure for firefighting drones, relating to the field of firefighting technology. It includes a mounting base and a mixing mechanism installed at the bottom center of the mounting base. The mixing mechanism comprises a mixer, three mounting brackets, variable-pitch guide vanes, multiple baffle columns, equidistant guide vanes, and a rectifier. Through the coordinated operation of the mixing mechanism, extinguishing agent storage tank, delivery pipe, and solenoid valve, this invention achieves precise proportioning and efficient mixing of two different types of extinguishing agents. Relying on a Venturi-structured mixer, combined with the hierarchical flow guidance and baffle design of the variable-pitch guide vanes, baffle columns, equidistant guide vanes, and rectifier, the two extinguishing agents are allowed to fully swirl, collide, and fuse within the mixing chamber, achieving a synergistic fire extinguishing effect of cooling, oxygen isolation, and inhibition of combustion chain reactions. This effectively improves fire extinguishing efficiency, enhances adaptability to various types of fires such as oil, electrical, and chemical fires, and reduces the probability of fire reignition.

Description

Technical Field

[0001] This invention relates to the field of fire protection technology, and specifically to a mixed fire extinguishing agent spraying structure for fire-fighting drones. Background Technology

[0002] Mixed extinguishing agents refer to composite extinguishing agents composed of two or more different types of extinguishing components combined in a specific ratio, which can synergistically enhance the extinguishing effect. Common components may include water, foam liquid, dry powder, flame retardant, extinguishing additives, etc. Through the complementary effect between different components, they can simultaneously achieve functions such as cooling, isolating oxygen, inhibiting the combustion chain reaction, and preventing reignition. They are suitable for fighting complex fires and various types of fires.

[0003] Chinese patent CN213555052U discloses an intelligent jet device based on gaseous fire extinguishing agent. When the intelligent jet device is powered on, the flame detector in the fire detection / spraying structure detects a fire and sends a signal to a remote controller. The remote controller has a remote control function and automatically responds by issuing commands to the actuator and the electric valve. The actuator operates, controlling the container valve to open, and the electric valve opens, connecting the cylinder to the fire pipeline. The gaseous fire extinguishing agent flows through the fire pipeline and is sprayed out from the fire detection / spraying structure, thereby extinguishing the fire.

[0004] When existing fire-fighting spraying devices are used with fire-fighting drones, they can usually only carry and spray a single extinguishing agent. When facing complex fire situations, a single extinguishing agent is often ineffective and difficult to deal with complex types of fires such as oil, electrical, and chemical fires. It also has problems such as low fire extinguishing efficiency and weak ability to suppress reignition. Summary of the Invention

[0005] The purpose of this invention is to provide a mixed extinguishing agent spraying structure for firefighting drones, so as to solve the problem that existing drone firefighting devices can only spray a single extinguishing agent and have low fire extinguishing efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mixed fire extinguishing agent spraying structure for firefighting drones, including a mounting base;

[0007] A mixing mechanism is installed at the bottom center of the mounting base;

[0008] The mixing mechanism includes a mixer, three mounting brackets, a variable-pitch guide vane, multiple turbulence columns, an equidistant guide vane, and a rectifier. The three mounting brackets are all fitted onto the outer wall of the mixer, and the top of the mounting bracket is installed at the bottom of the mounting base. The variable-pitch guide vane is installed on the inner left side of the mixer. The multiple turbulence columns are all installed on the inner middle side of the mixer and are arranged sequentially along the throat axis of the mixer. The equidistant guide vane and the rectifier are both installed on the inner right side of the mixer, and the equidistant guide vane is located on the left side of the rectifier.

[0009] An adjustment mechanism is installed at one end of the mixing mechanism;

[0010] A diameter-changing mechanism is installed at one end of the adjusting mechanism;

[0011] Two storage tank supports are respectively installed on both sides of the bottom end of the mounting base. Fire extinguishing agent storage tanks are respectively installed on the inner walls of the two storage tank supports. A delivery pipe is provided at one end of each of the two fire extinguishing agent storage tanks, and a solenoid valve is provided on each of the two delivery pipes.

[0012] Furthermore, the adjustment mechanism includes a mounting plate, a telescopic drive assembly, a rotating mechanism, a spray pipe, and a variable diameter nozzle. The mounting plate is mounted on the bottom end of the mounting base, the telescopic drive assembly is mounted on the bottom end of the mounting plate, the rotating mechanism is mounted on the bottom end of the telescopic drive assembly, the spray pipe is mounted inside the rotating mechanism, and the left end of the spray pipe is connected to the right end of the mixer. The variable diameter nozzle is mounted on the right end of the spray pipe.

[0013] Furthermore, the rotating mechanism includes a fixed frame, a rotating frame, a rotating drive assembly, and an electric rotating platform. The rotating frame is mounted between the inner walls of both sides of the fixed frame via bearings, and the inner wall of the rotating frame is fixedly connected to the outer wall of the injection pipe. The rotating drive assembly is mounted on the lower side of the outer wall of the rotating frame, and the electric rotating platform is mounted on the top of the fixed frame, with the top of the electric rotating platform mounted on the bottom of the telescopic drive assembly.

[0014] Furthermore, the diameter changing mechanism includes a diameter changing frame, multiple diameter changing drive components, multiple diameter changing blocks, a camera, and two fixing rods. The multiple diameter changing drive components are respectively installed in the middle of the four outer walls of the diameter changing frame, the multiple diameter changing blocks are respectively installed at the output ends of the multiple diameter changing drive components, the camera is installed on one side of the top of the diameter changing frame, and the two fixing rods are respectively installed on the upper and lower left sides of the diameter changing frame, and the inner sides of the two fixing rods are fixedly connected to the outer wall of the rotating frame.

[0015] Furthermore, drone mounting frames are installed on both sides of the top of the mounting base, a storage slot is provided in the middle of the top of the mounting base, multiple heat dissipation holes are provided in the bottom wall of the storage slot, and a control box is installed on the bottom wall of the storage slot.

[0016] Furthermore, the mixer adopts a Venturi structure, the variable pitch guide vane adopts a gradually changing pitch structure, the included angle between the axes of two adjacent turbulence columns is 22.5°, the pitch of the equidistant guide vane is less than the minimum pitch of the variable pitch guide vane, and the rectifier adopts a honeycomb structure.

[0017] Furthermore, the two fire extinguishing agent storage tanks store different types of fire extinguishing agents, and the two delivery pipes are tangentially connected to the top left and bottom left of the mixer, respectively.

[0018] Furthermore, the fixing frame is configured as a Y-shaped structure, the spray pipe adopts a telescopic structure, and the variable diameter nozzle adopts a flexible rubber tube body.

[0019] Furthermore, the variable diameter frame is configured as a rectangular structure and is fitted onto the outer wall of the variable diameter nozzle, and the end of the variable diameter block near the variable diameter nozzle is configured as an arc-shaped end face.

[0020] Furthermore, the mounting base is installed on the firefighting drone via a drone mounting frame, and the control box is electrically connected to the adjustment mechanism, the diameter changing mechanism, and the solenoid valve.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) This invention achieves precise proportioning and efficient mixing of two different types of extinguishing agents through the coordinated operation of the mixing mechanism, extinguishing agent storage tank, delivery pipe and solenoid valve. Relying on the Venturi structure mixer, combined with the hierarchical flow guidance and turbulence design of variable pitch guide vanes, turbulence columns, equidistant guide vanes and rectifier, the two extinguishing agents are fully swirled, collide and merge in the mixing chamber, achieving the synergistic fire extinguishing effect of cooling, oxygen isolation and inhibiting the combustion chain reaction, effectively improving fire extinguishing efficiency, enhancing adaptability to various types of fires such as oil, electrical, and chemical fires, and reducing the probability of fire reignition.

[0023] (2) Through the coordinated operation of the mounting plate, telescopic drive assembly, rotating mechanism, spray pipe and variable diameter nozzle, the present invention realizes the flexible adjustment of the spray position and angle of the fire extinguishing agent and the free control of the spray distance. The telescopic drive assembly can drive the spray pipe to extend and retract, changing the effective distance of the spraying operation. The rotating mechanism realizes the multi-dimensional rotation of the spray pipe through the dual drive of the electric rotating table and the rotating drive assembly. With the flight position of the fire-fighting drone, the fire extinguishing agent can be accurately sprayed to the core area of ​​the fire, avoiding the waste of fire extinguishing agent and improving the flexibility and accuracy of the device.

[0024] (3) The present invention achieves adaptive adjustment of the spray pattern and diameter of the extinguishing agent through the coordinated work of the variable diameter frame, variable diameter drive component, variable diameter block, camera and fixing rod. The camera can capture information such as the size of the fire area and the intensity of the fire in real time, providing a basis for the variable diameter adjustment. The variable diameter drive component drives the variable diameter block to squeeze the variable diameter nozzle in multiple directions, realizing the switching between the nozzle in a circular and flat shape, adapting to the spraying needs of different fires, and further improving the targeting and efficiency of fire extinguishing operations. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure without the mounting base is provided for an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the hybrid mechanism is provided for an embodiment of the present invention;

[0029] Figure 4 A structural cross-sectional view of a mixer is provided for embodiments of the present invention;

[0030] Figure 5 A schematic diagram of the mounting base is provided for embodiments of the present invention;

[0031] Figure 6 A schematic diagram of the adjustment mechanism is provided for embodiments of the present invention;

[0032] Figure 7 A schematic diagram of the rotating mechanism is provided for an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of the variable diameter mechanism is provided for an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Mounting base; 2. Mixing mechanism; 3. Adjusting mechanism; 4. Variable diameter mechanism; 5. Storage tank bracket; 6. Extinguishing agent storage tank; 7. Delivery pipe; 8. Solenoid valve; 9. UAV mounting frame; 10. Storage slot; 11. Heat dissipation hole; 12. Control box; 21. Mixer; 22. Mounting bracket; 23. Variable pitch guide vane; 24. Baffle column; 25. Equidistant guide vane; 26. Rectifier; 31. Mounting plate; 32. Telescopic drive assembly; 33. Rotation mechanism; 34. Spray pipe; 35. Variable diameter nozzle; 331. Fixing frame; 332. Rotating frame; 333. Rotation drive assembly; 334. Electric rotary table; 41. Variable diameter frame; 42. Variable diameter drive assembly; 43. Variable diameter block; 44. Camera; 45. Fixing rod. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] As attached Figure 1 To be continued Figure 8 As shown:

[0038] Example 1:

[0039] This invention provides a mixed fire extinguishing agent spraying structure for firefighting drones, including a mounting base 1;

[0040] The mixing mechanism 2 is installed at the bottom center of the mounting base 1 and provides a core cavity for efficient mixing of different types of fire extinguishing agents;

[0041] The mixing mechanism 2 includes a mixer 21, three mounting brackets 22, variable-pitch guide vanes 23, multiple baffle columns 24, equidistant guide vanes 25, and a rectifier 26. The three mounting brackets 22 are all fitted onto the outer wall of the mixer 21, with the top of each bracket mounted on the bottom of the mounting base 1. This three-point mounting layout provides stable support for the mixer 21, effectively preventing structural loosening caused by vibrations generated during UAV flight and ensuring the mixing and delivery of the extinguishing agent. For stability, the variable-pitch guide vane 23 is installed inside the left side of the mixer 21, and multiple turbulence columns 24 are installed inside the middle side of the mixer 21 and arranged sequentially along the throat axis of the mixer 21. The equidistant guide vane 25 and the rectifier 26 are installed inside the right side of the mixer 21, and the equidistant guide vane 25 is located to the left of the rectifier 26, forming a hierarchical internal structure from left to right: flow guidance, turbulence, secondary flow guidance, and rectification, so as to realize the gradual mixing and flow pattern management of the extinguishing agent.

[0042] Adjustment mechanism 3, installed at one end of mixing mechanism 2, is used to adjust the spraying distance and angle of extinguishing agent;

[0043] The variable diameter mechanism 4 is installed at one end of the adjustment mechanism 3 to adapt to different fire conditions and achieve flexible adjustment of the spray pattern and diameter.

[0044] Two storage tank supports 5 are respectively installed on both sides of the bottom end of the mounting base 1. Fire extinguishing agent storage tanks 6 are respectively installed on the inner walls of the two storage tank supports 5. One end of each of the two fire extinguishing agent storage tanks 6 is provided with a delivery pipe 7. Solenoid valves 8 are provided on both delivery pipes 7. The solenoid valves 8 are normally closed solenoid control valves, which can realize precise control of the on and off of the delivery of fire extinguishing agent, and at the same time facilitate the control box 12 to adjust the delivery ratio and flow rate of fire extinguishing agent.

[0045] Both sides of the top of the mounting base 1 are equipped with drone mounting racks 9. The drone mounting racks 9 have multiple mounting holes to adapt to the mounting interfaces of different models of fire-fighting drones, so as to realize the quick and fixed connection between the device and the fire-fighting drone. The top center of the mounting base 1 has a storage groove 10. The bottom wall of the storage groove 10 has multiple heat dissipation holes 11. The bottom wall of the storage groove 10 is equipped with a control box 12. The heat dissipation holes 11 are arranged in an array to quickly dissipate the heat generated by the control box 12 during operation, avoid damage to the internal electronic components caused by high temperature, and extend the service life of the control box 12.

[0046] The mixer 21 adopts a Venturi structure, utilizing the Venturi effect to achieve flow rate pressurization and initial mixing of the extinguishing agent. The variable pitch guide vane 23 adopts a gradually changing pitch structure. The gradually changing pitch causes the extinguishing agent entering the mixer 21 to form a gradient swirling flow as the pitch changes. The large pitch at the inlet end facilitates fluid introduction, while the small pitch near the throat accelerates the swirling flow, allowing the two extinguishing agents to initially form a swirling state and produce initial mixing. The included angle between the axes of two adjacent turbulence columns 24 is 22.5°. This angle allows multiple turbulence columns 24 to form a uniform turbulence barrier at the throat of the mixer 21, causing the swirling extinguishing agent to flow through at multiple angles and directions. The collision, dispersion, and turbulence break the laminar flow state of the extinguishing agent, allowing the two extinguishing agents to fully contact each other and greatly improving the basic mixing effect. The pitch of the equidistant guide plate 25 is smaller than the minimum pitch of the variable pitch guide plate 23. The smaller equidistant pitch can finely comb through the turbulent extinguishing agent dispersed by the turbulence column 24 and accelerate the secondary swirl, allowing the extinguishing agent that is not fully mixed to form a high-speed swirl again and be deeply mixed. The rectifier 26 adopts a honeycomb structure. The honeycomb structure of the rectifier 26 can comb the mixed extinguishing agent in the swirling state into a stable direct current state, avoiding the problems of turbulent flow and dispersion of the extinguishing agent during spraying.

[0047] The two extinguishing agent storage tanks 6 store different types of extinguishing agents, such as combinations of water-based extinguishing agents, foam extinguishing agents, and dry powder extinguishing agents. The two delivery pipes 7 are tangentially connected to the top left and bottom left of the mixer 21, respectively. The tangential connection allows the extinguishing agent to enter the cavity along the tangential direction of the inner wall of the mixer 21, naturally forming a swirling flow, which lays the foundation for subsequent thorough mixing.

[0048] The mounting base 1 is installed on the fire-fighting drone via the drone mounting frame 9. The drone mounting frame 9 can achieve a stable connection with the fire-fighting drone, meeting the mounting requirements for aerial fire-fighting operations. The control box 12 is electrically connected to the adjustment mechanism 3, the diameter changing mechanism 4, and the solenoid valve 8. The control box 12 integrates a microcontroller, a wireless communication module, and a power supply module, which can realize remote signal interaction with the fire-fighting drone and complete remote linkage control of each mechanism.

[0049] Working Principle: The mounting base 1 is installed on the fire-fighting drone via the drone mounting frame 9 to achieve aerial operation. During operation, the control box 12 controls the linkage of all components. First, the solenoid valves 8 on the two delivery pipes 7 are opened synchronously, allowing different types of extinguishing agents in the two extinguishing agent storage tanks 6 to enter the mixer 21 tangentially through the delivery pipes 7. The Venturi structure of the mixer 21 achieves initial flow rate regulation. The extinguishing agent first passes through the variable pitch guide vane 23 on the left side of the mixer 21, forming a swirling flow under the guidance of the gradually changing pitch. Then, it flows through multiple turbulence columns 24 arranged sequentially along the throat axis in the middle of the interior. Under the action of the turbulence columns 24, it is fully collided and dispersed, consolidating the basic mixing effect. Then, the extinguishing agent continues to flow to the right, passing through the equidistant guide vane 25 with a pitch smaller than the minimum pitch of the variable pitch guide vane 23, further sorting the swirling flow and achieving the mixing effect of the two extinguishing agents. The mixture is deeply integrated and then rectified by the honeycomb-structured rectifier 26 to form a uniformly mixed and stable flow of extinguishing agent. The mixed extinguishing agent flows sequentially through the regulating mechanism 3 and the variable diameter mechanism 4 to complete the spraying operation. This structure, through the hierarchical design of the variable pitch guide vane 23, the turbulence column 24, the equidistant guide vane 25 and the rectifier 26, combined with the precise on / off control of the solenoid valve 8, allows the two extinguishing agents to fully swirl, collide and merge in the mixing chamber, greatly improving the mixing uniformity. This not only achieves precise proportioning and efficient mixing of different types of extinguishing agents, solving the problem that traditional fire-fighting drones can only spray a single extinguishing agent and have weak ability to deal with complex fires, but also achieves synergistic fire extinguishing effects such as cooling, oxygen isolation and inhibition of combustion chain reactions, effectively improving fire extinguishing efficiency, enhancing adaptability to various types of fires such as oil, electrical, and chemical fires, and reducing the probability of fire reignition.

[0050] Example 2:

[0051] This embodiment is basically the same as the previous embodiment, except that the adjustment mechanism 3 includes a mounting plate 31, a telescopic drive assembly 32, a rotating mechanism 33, a spray pipe 34, and a variable diameter nozzle 35. The mounting plate 31 is installed at the bottom of the mounting base 1, and the telescopic drive assembly 32 is installed at the bottom of the mounting plate 31. The telescopic drive assembly 32 adopts an electric push rod structure, which has the characteristics of precise telescopic stroke and stable driving force. The telescopic length can be freely adjusted according to the operation requirements. The rotating mechanism 33 is installed at the bottom of the telescopic drive assembly 32, and the spray pipe 34 is installed inside the rotating mechanism 33. The left end of the spray pipe 34 is connected to the right end of the mixer 21, and the variable diameter nozzle 35 is installed at the right end of the spray pipe 34.

[0052] The rotating mechanism 33 includes a fixed frame 331, a rotating frame 332, a rotating drive assembly 333, and an electric rotating table 334. The rotating frame 332 is mounted between the inner walls of the two sides of the fixed frame 331 via bearings, and the inner wall of the rotating frame 332 is fixedly connected to the outer wall of the spray pipe 34. The rotating drive assembly 333 is mounted on the lower side of the outer wall of the rotating frame 332. The rotating drive assembly 333 adopts a servo motor and gear transmission structure, which has high transmission accuracy and can realize precise angle control of the rotating frame 332. The electric rotating table 334 is mounted on the top of the fixed frame 331, and the top of the electric rotating table 334 is mounted on the bottom of the telescopic drive assembly 32.

[0053] The mounting bracket 331 is designed with a Y-shaped structure. Compared with the traditional frame structure, the Y-shaped mounting bracket 331 significantly reduces its own weight while ensuring structural support strength, making it suitable for the load requirements of fire-fighting drones. The spray pipe 34 adopts a telescopic structure, which allows the length of the spray pipe 34 to be freely adjusted according to the fire operation distance, adapting to the spraying needs of fire-fighting drones at different flight altitudes and fire distances, changing the effective spraying distance of the extinguishing agent, and at the same time, it works with the rotating mechanism 33 to achieve multi-dimensional spraying, improving the operational flexibility of the device. The variable diameter nozzle 35 uses a flexible rubber tube body, which has good elasticity and deformation ability, and can flexibly switch the cross-sectional shape under external pressure.

[0054] Working principle: The extinguishing agent spraying distance and angle are flexibly controlled through the adjusting mechanism 3. During operation, the uniformly mixed extinguishing agent in the mixer 21 flows into the spray pipe 34. The control box 12 can control the telescopic drive component 32 to telescopically move according to the fire situation and the required operating distance, driving the rotating mechanism 33 and the spray pipe 34 to telescopically extend and retract synchronously. The telescopic structure of the spray pipe 34 allows for free adjustment of the effective spraying distance, adapting to the spraying needs of fires at different heights and distances. At the same time, the control box 12 drives the rotating mechanism 33 in linkage, and the electric rotating table 334 drives the fixed frame 331 and the entire spray pipe. The pipe 34 rotates horizontally, while the rotation drive assembly 333 drives the rotating frame 332 to rotate vertically around the bearing of the fixed frame 331. The rotating frame 332 is fixedly connected to the spray pipe 34 and drives it to rotate synchronously. Through the dual drive of the electric rotating table 334 and the rotation drive assembly 333, the multi-dimensional rotation adjustment of the spray pipe 34 and the variable diameter nozzle 35 can be realized. Combined with the flight position of the fire-fighting drone, it can ensure that the extinguishing agent can be stably delivered at different spray angles and distances, and accurately sprayed to the core area of ​​the fire, effectively improving the flexibility and accuracy of fire-fighting operations and avoiding the ineffective waste of extinguishing agent.

[0055] Example 3:

[0056] This embodiment is basically the same as the previous embodiment, except that the diameter changing mechanism 4 includes a diameter changing frame 41, multiple diameter changing drive components 42, multiple diameter changing blocks 43, a camera 44, and two fixing rods 45. The multiple diameter changing drive components 42 are respectively installed in the middle of the four outer walls of the diameter changing frame 41. The diameter changing drive components 42 adopt a miniature electric push rod structure, which is small in size and has high telescopic accuracy, adapting to the installation space and adjustment requirements of the diameter changing frame 41. The multiple diameter changing blocks 43 are respectively installed at the output ends of the multiple diameter changing drive components 42, and the camera 44 is installed on the diameter changing frame 41. On one side of the top, the camera 44 is a high-definition night vision wide-angle camera, which can capture the image information of the fire area in real time in complex fire environment and transmit the image to the control box 12 and the control terminal of the fire-fighting drone. Two fixed rods 45 are respectively installed on the upper and lower sides of the left end of the variable diameter frame 41, and the inner sides of the two fixed rods 45 are fixedly connected to the outer wall of the rotating frame 332. Through the symmetrical connection of the two fixed rods 45, the variable diameter mechanism 4 and the rotating mechanism 33 are stably connected, ensuring that the variable diameter mechanism 4 is synchronously linked when the rotating mechanism 33 rotates, without relative displacement.

[0057] The variable diameter frame 41 is a rectangular structure and is fitted onto the outer wall of the variable diameter nozzle 35. An adjustment gap is reserved between the variable diameter frame 41 and the variable diameter nozzle 35. The reserved adjustment gap provides sufficient space for the expansion and contraction of the variable diameter block 43 and the deformation of the variable diameter nozzle 35, avoiding interference between the structures. The end of the variable diameter block 43 near the variable diameter nozzle 35 is set as an arc-shaped end face. The arc-shaped end face is adapted to the arc-shaped outer wall of the variable diameter nozzle 35. When squeezed, it can fit tightly against the outer wall of the variable diameter nozzle 35 to achieve uniform squeezing and avoid excessive local force that could damage the variable diameter nozzle 35.

[0058] Working principle: The variable diameter mechanism 4 enables adaptive control of the extinguishing agent spray pattern and diameter. During operation, the camera 44 captures real-time information such as the range and intensity of the fire area and feeds it back to the control box 12, providing data for the variable diameter adjustment. The control box 12 controls multiple variable diameter drive components 42 to operate synchronously based on the fire data. The variable diameter drive components 42 drive the variable diameter blocks 43 at the output end to perform directional extension and retraction movements. The variable diameter blocks 43 on the upper and lower sides push and squeeze towards the variable diameter nozzle 35, while the variable diameter blocks 43 on the left and right sides pull the variable diameter nozzle 35 outward. Through the synergistic effect of pushing and pulling, the outlet cross-section of the variable diameter nozzle 35 forms an elliptical flat shape. The system allows for flexible switching of the nozzle cross-section from circular to elliptical and flat, adapting to the spraying needs of different fire conditions. For small, localized fires, the system controls the resetting of each diameter-changing block 43, maintaining the nozzle's circular opening for precise and concentrated spraying of the extinguishing agent. For large-area fires, the aforementioned pushing and pulling action causes the nozzle to form an elliptical and flat wide opening, achieving wide-area coverage spraying of the extinguishing agent. The coordinated operation of the diameter-changing mechanism 4 and the adjustment mechanism 3, combined with fire monitoring feedback from the camera 44, enables linked control of fire monitoring and spraying operations. This allows the structure to flexibly adjust the spraying method according to the actual fire situation, further improving the targeting and efficiency of fire extinguishing operations and maximizing the extinguishing effect of the mixed extinguishing agent.

[0059] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A mixed fire extinguishing agent spraying structure for firefighting drones, characterized in that, include: Mounting base (1); The mixing mechanism (2) is installed at the bottom center of the mounting base (1); The mixing mechanism (2) includes a mixer (21), three mounting brackets (22), a variable pitch guide vane (23), multiple turbulence columns (24), an equidistant guide vane (25), and a rectifier (26). The three mounting brackets (22) are all fitted on the outer wall of the mixer (21), and the top of the mounting bracket (22) is installed on the bottom of the mounting base (1). The variable pitch guide vane (23) is installed on the left side inside the mixer (21). The multiple turbulence columns (24) are all installed on the middle side inside the mixer (21) and arranged sequentially along the throat axis of the mixer (21). The equidistant guide vane (25) and the rectifier (26) are both installed on the right side inside the mixer (21), and the equidistant guide vane (25) is located on the left side of the rectifier (26). An adjustment mechanism (3) is installed at one end of the mixing mechanism (2); A diameter-changing mechanism (4) is installed at one end of the adjusting mechanism (3); Two storage tank brackets (5) are respectively installed on the bottom sides of the mounting base (1). Fire extinguishing agent storage tanks (6) are respectively installed on the inner walls of the two storage tank brackets (5). A delivery pipe (7) is provided at one end of each of the two fire extinguishing agent storage tanks (6). A solenoid valve (8) is provided on each of the two delivery pipes (7).

2. The mixed extinguishing agent spraying structure for firefighting drones according to claim 1, characterized in that, The adjustment mechanism (3) includes a mounting plate (31), a telescopic drive assembly (32), a rotating mechanism (33), a spray pipe (34), and a variable diameter nozzle (35). The mounting plate (31) is installed at the bottom of the mounting base (1). The telescopic drive assembly (32) is installed at the bottom of the mounting plate (31). The rotating mechanism (33) is installed at the bottom of the telescopic drive assembly (32). The spray pipe (34) is installed inside the rotating mechanism (33), and the left end of the spray pipe (34) is connected to the right end of the mixer (21). The variable diameter nozzle (35) is installed at the right end of the spray pipe (34).

3. The mixed extinguishing agent spraying structure for firefighting drones according to claim 2, characterized in that, The rotating mechanism (33) includes a fixed frame (331), a rotating frame (332), a rotating drive assembly (333), and an electric rotating platform (334). The rotating frame (332) is mounted between the inner walls of the two sides of the fixed frame (331) by bearings, and the inner wall of the rotating frame (332) is fixedly connected to the outer wall of the injection pipe (34). The rotating drive assembly (333) is mounted on the lower side of the outer wall of the rotating frame (332). The electric rotating platform (334) is mounted on the top of the fixed frame (331), and the top of the electric rotating platform (334) is mounted on the bottom of the telescopic drive assembly (32).

4. The mixed extinguishing agent spraying structure for firefighting drones according to claim 3, characterized in that, The diameter changing mechanism (4) includes a diameter changing frame (41), multiple diameter changing drive components (42), multiple diameter changing blocks (43), a camera (44), and two fixing rods (45). The multiple diameter changing drive components (42) are respectively installed in the middle of the four outer walls of the diameter changing frame (41). The multiple diameter changing blocks (43) are respectively installed at the output end of the multiple diameter changing drive components (42). The camera (44) is installed on one side of the top of the diameter changing frame (41). The two fixing rods (45) are respectively installed on the upper and lower left sides of the diameter changing frame (41), and the inner sides of the two fixing rods (45) are fixedly connected to the outer wall of the rotating frame (332).

5. A mixed fire extinguishing agent spraying structure for firefighting drones according to claim 1, characterized in that, The top two sides of the mounting base (1) are equipped with drone mounting frames (9), and the top center of the mounting base (1) is provided with a storage groove (10). The bottom wall of the storage groove (10) is provided with multiple heat dissipation holes (11), and the bottom wall of the storage groove (10) is equipped with a control box (12).

6. A mixed fire extinguishing agent spraying structure for firefighting drones according to claim 1, characterized in that, The mixer (21) adopts a venturi structure, the variable pitch guide vane (23) adopts a gradually changing pitch structure, the included angle between the axes of two adjacent turbulence columns (24) is 22.5°, the pitch of the equidistant guide vane (25) is less than the minimum pitch of the variable pitch guide vane (23), and the rectifier (26) adopts a honeycomb structure.

7. A mixed fire extinguishing agent spraying structure for firefighting drones according to claim 1, characterized in that, The two fire extinguishing agent storage tanks (6) store different types of fire extinguishing agents, and the two delivery pipes (7) are tangentially connected to the top left and bottom left of the mixer (21).

8. A mixed fire extinguishing agent spraying structure for firefighting drones according to claim 3, characterized in that, The fixing frame (331) is configured as a Y-shaped structure, the spray pipe (34) adopts a telescopic structure, and the variable diameter nozzle (35) adopts a flexible rubber tube body.

9. A mixed fire extinguishing agent spraying structure for firefighting drones according to claim 4, characterized in that, The variable diameter frame (41) is configured as a rectangular structure and is fitted onto the outer wall of the variable diameter nozzle (35). The end of the variable diameter block (43) near the variable diameter nozzle (35) is configured as an arc-shaped end face.

10. A mixed fire extinguishing agent spraying structure for firefighting drones according to claim 5, characterized in that, The mounting base (1) is installed on the fire-fighting drone via the drone mounting frame (9), and the control box (12) is electrically connected to the adjustment mechanism (3), the diameter changing mechanism (4), and the solenoid valve (8).

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