Ducted fan and ducted fan unmanned aerial vehicle for fire fighting

Abstract

The invention relates to the technical field of ducted fans, and provides a ducted fan and a ducted fan unmanned aerial vehicle for fire fighting. The ducted fan comprises a ducted body, a fan body and a fan body, the wheel hub, the stationary blade and the movable blade are arranged in the flow channel, the stationary blade is connected with the wheel hub and the duct body, and the movable blade is rotatably arranged on the wheel hub; wherein the duct body comprises a main body section and a lip section which are arranged in the axial direction and connected, an inlet of the duct body is formed in the end, away from the main body section, of the lip section in the axial direction, an outlet of the duct body is formed in the end, away from the lip section, of the main body section, the inner diameter of the lip section is gradually reduced in the direction from the inlet to the outlet, and the lip section is provided with a plurality of through holes; the multiple through holes are formed in the circumferential direction of the lip section at intervals. According to the technical scheme, the pressure difference between the windward side and the leeward side of the lip area of the duct body can be reduced, the lateral resistance borne by the ducted fan is reduced, and then the propelling efficiency of the ducted fan is improved.

Description

Technical Field

[0001] This application relates to the field of ducted fan technology, and more specifically, to a ducted fan and a ducted fan drone for fire fighting. Background Technology

[0002] As a propulsion unit, the ducted fan's power output directly affects the drone's flight status and performance.

[0003] When a ducted fan is operating, when the airflow passes through the lip on the windward side of the duct, the airflow flowing laterally from the duct fan must pass over the lip. When the airflow passes through the lip on the leeward side of the duct, a flow stagnation zone (also known as a flow blockage zone) is generated downstream of the leading edge of the lip. This results in higher pressure on the surface of the leeward side of the lip and lower pressure on the surface of the windward side of the lip. Consequently, the large pressure difference between the windward and leeward sides of the lip creates significant lateral drag, which in turn affects the propulsion efficiency of the ducted fan. Summary of the Invention

[0004] This application provides a ducted fan and a ducted fan drone for firefighting, which can reduce the pressure difference between the windward and leeward sides of the duct lip area, reduce the lateral drag on the ducted fan, and thus improve the propulsion efficiency of the ducted fan.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution: In a first aspect, this application provides a ducted fan, comprising: a duct body having a flow channel inside; a hub, stationary blades, and moving blades, all disposed within the flow channel; the stationary blades connecting the hub and the duct body; and the moving blades rotatably disposed on the hub; wherein the duct body includes a main body section and a lip section arranged and connected along an axial direction; along the axial direction, one end of the lip section opposite to the main body section forms the inlet of the duct body; one end of the main body section opposite to the lip section forms the outlet of the duct body; the inner diameter of the lip section gradually decreases along the direction from the inlet to the outlet; and the lip section is provided with a plurality of through holes spaced apart circumferentially along the lip section.

[0006] In the implementation of the above scheme, the two ends of the stationary blades are connected to the hub and the inner peripheral wall of the duct, respectively, thereby improving the overall structural stability of the ducted fan. Since the inner surface of the lip region, which is also the leeward side of the lip, has a higher pressure and forms a pressure difference with the outer surface, multiple through holes are arranged at intervals along the circumference of the lip section. In this way, the through holes will play a role in depressurizing the airflow, that is, balancing the pressure difference between the inner and outer surfaces of the lip section. When the airflow is about to enter the opening of the duct from a distance, a small part of the airflow flowing from the side of the duct will flow directly into the flow channel through the through holes, without having to cross the lip section to enter the leeward side (inner surface of the lip section). In this way, the multiple through holes reduce the pressure difference between the inner and outer surfaces of the lip section, reduce the lateral drag of the ducted fan, and improve the propulsion efficiency of the ducted fan.

[0007] In one embodiment, the through hole forms an opening on the inner circumferential surface of the lip segment. Along the axial direction, the size of the lip segment is L1, and the distance between the geometric center of the opening and the inlet is L2, where 0.3 ≤ L2 / L1 ≤ 0.8.

[0008] In the implementation of the above scheme, since the size of the lip section is L1 and the distance between the geometric center of the opening and the inlet is L2, 0.3≤L2 / L1≤0.8, it is equivalent to the setting position of the through hole being close to the main body section of the lip section, and the opening position is also in the flow stagnation zone. This can maximize the balance of the pressure difference of the airflow on the inner and outer surfaces of the lip section.

[0009] In one embodiment, the circumferential dimension of the through hole along the lip segment is L3, and the axial dimension of the through hole is L4, where 0.1 ≤ L4 / L3 ≤ 1.

[0010] In the implementation of the above scheme, the circumferential dimension of the through hole along the lip section is L3, and the axial dimension of the through hole is L4, 0.1≤L4 / L3≤1, which means that the cross-sectional shape of the through hole can be square, rectangular, circular or elliptical. Since the circumferential dimension of the through hole along the lip section is not less than the axial dimension, the through hole extends as far as possible along the circumference of the duct body, rather than along the axial direction. If the axial dimension of the through hole continues to extend along the axial direction of the duct body, it means that the through hole will gradually extend into the main body section, and the through hole will not be able to play the role of balancing the internal and external air pressure.

[0011] In one embodiment, the moving blade rotates in a first direction to allow airflow to flow from the inlet to the outlet; when the moving blade rotates in the first direction, the direction of the aerodynamic torque of the airflow on the moving blade is consistent with the direction of the aerodynamic torque of the airflow on the stationary blade.

[0012] In the implementation of the above scheme, by aligning the direction of the aerodynamic torque of the airflow on the moving blades with the direction of the aerodynamic torque of the airflow on the stationary blades, the aerodynamic torque of the stationary blades no longer cancels out the aerodynamic torque of the moving blades. This increases the aerodynamic torque of the ducted fan, making it easier to adjust the flight attitude of the ducted fan.

[0013] In one embodiment, along the thickness direction of the stationary blade, the two opposing surfaces of the stationary blade are a first arcuate surface and a second arcuate surface, respectively. The curvature of the first arcuate surface is greater than the curvature of the second arcuate surface, and the second arcuate surface faces the first direction.

[0014] In the implementation of the above scheme, along the thickness direction of the stationary blade, the two opposing surfaces of the stationary blade are a first arc-shaped surface and a second arc-shaped surface, respectively. The first arc-shaped surface faces the second direction, and the second arc-shaped surface faces the first direction. The first direction and the second direction are two opposite directions. The curvature of the first arc-shaped surface is greater than the curvature of the second arc-shaped surface. In this way, the lift force on the stationary blade is also in the second direction. At the same time, when the moving blade rotates in the first direction, the aerodynamic torque of the airflow on the moving blade is also in the second direction. Thus, the aerodynamic torque of the moving blade and the stationary blade are in the same direction, and the stationary blade will not cancel out part of the aerodynamic torque of the moving blade, thereby making it easier to flexibly adjust the flight attitude of the ducted fan.

[0015] In one embodiment, the diameter of the rotating surface formed after the rotating blade is D, and the axial dimension of the duct body is L5, where 0.2≤L5 / D≤0.3.

[0016] In the implementation of the above scheme, by controlling the ratio of the axial dimension of the duct to the diameter of the rotating surface formed by the rotation of the moving blade within the range of 0.2 to 0.3, the axial dimension of the duct is reduced and the shaft diameter ratio is lowered while the diameter of the moving blade remains unchanged. Consequently, the lateral projected area of ​​the duct is also reduced, and the lateral drag caused by the crosswind is reduced under flight conditions such as crosswind or forward flight.

[0017] In one embodiment, the axial height of the culvert is 200mm≤L5≤250mm.

[0018] In the implementation of the above scheme, the original duct body had an axial height of 339mm. The axial height of the current duct body has been reduced, thereby reducing the side projection area.

[0019] In one embodiment, the minimum distance between the stationary blade and the moving blade along the axial direction is 80 mm.

[0020] In implementing the above solution, compared with the existing technology, the distance between the stationary blades and the moving blades is reduced, which is equivalent to reducing the axial height of the ducted fan and also reducing the weight of the ducted fan.

[0021] In one embodiment, an air intake cap is provided at the front end of the wheel hub, and an exhaust cone is provided at the rear end of the wheel hub. Along the axial direction, the front end is closer to the inlet than the rear end.

[0022] In the implementation of the above scheme, by setting an air intake cap, it is beneficial to improve the flow velocity field distribution when the airflow flows into the duct body, reduce flow losses, and improve aerodynamic efficiency. By setting an exhaust cone, it is beneficial to improve the flow velocity field distribution when the airflow flows out of the duct fan, reduce flow losses, and improve aerodynamic efficiency.

[0023] Secondly, this application also provides a ducted fan drone for firefighting, including the ducted fan provided in the first aspect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a ducted fan provided in an embodiment of this application; Figure 2 These are schematic diagrams of the ducted fan from different perspectives provided in the embodiments of this application; Figure 3 A side view of a ducted fan provided in an embodiment of this application; Figure 4 This is a structural schematic diagram of a fire truck provided in an embodiment of this application.

[0026] Icons: 1-Ductwork; 11-Lip section; 12-Main body section; 2-Through hole; 21-Opening; 3-Moving blade; 4-Stationary blade; 41-First arc surface; 42-Second arc surface; 5-Hub; 6-Rotating seat; 7-Intake cap; 8-Exhaust cone; 9-Ductwork fan drone; 10-Box; 13-Liquid tank; 14-Water pump system; 15-Tethered cable reel; 16-Power generation module; 17-Support platform; 18-Lifting mechanism; 19-Lifting mechanism. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] A ducted fan typically includes a duct body 1, a hub 5, a rotating base 6, stationary blades 4, and moving blades 3. The high-speed rotation of the moving blades 3 generates pressure differential and jet flow, which is the direct source of thrust. The duct body 1 is an annular cylindrical structure that protects the internal components, prevents the moving blades 3 from injuring people or being hit by foreign objects, and reduces noise radiation. At the same time, the inlet lip region of the duct body 1 generates a suction effect, and the outlet expansion section achieves static pressure recovery. Both of these provide additional thrust. The rotating base 6 is connected to a drive motor, which converts the input electrical energy into mechanical torque, directly (or through a reducer) driving the moving blades 3 to rotate. The stationary blades 4 are located downstream of the moving blades 3, allowing the high-speed rotating vortex to form an axial flow after passing through the stationary blades 4, reducing energy loss and vortex noise.

[0030] However, in actual use, when the airflow passes through the lip on the leeward side of the duct 1, a flow stagnation zone (also an airflow stagnation zone) is generated downstream of the inner surface of the lip area because the airflow needs to cross the lip. This results in higher pressure on the leeward side of the lip, and thus a significant lateral drag is formed by the large pressure difference between the windward and leeward lip sides, which in turn affects the propulsion efficiency of the ducted fan.

[0031] Therefore, in the first aspect, such as Figures 1 to 3 As shown, this application embodiment provides a ducted fan, comprising a duct body 1, a hub 5, stationary blades 4, and moving blades 3. The duct body 1 has a flow channel inside. The hub 5, stationary blades 4, and moving blades 3 are all disposed within the flow channel. The stationary blades 4 connect the hub 5 and the duct body 1, and the moving blades 3 are rotatably disposed on the hub 5. The duct body 1 includes a main body section 12 and a lip section 11 arranged and connected along the axial direction. Along the axial direction, the end of the lip section 11 opposite to the main body section 12 forms the inlet of the duct body 1, and the end of the main body section 12 opposite to the lip section 11 forms the outlet of the duct body 1. The inner diameter of the lip section 11 gradually decreases along the direction from the inlet to the outlet. The lip section 11 is provided with a plurality of through holes 2, which are spaced apart circumferentially along the lip section 11.

[0032] Optionally, the inner diameter of the main body section 12 can be uniform. Of course, the inner diameter of the main body section 12 can also be an expansion section in the area near the outlet.

[0033] Optionally, the inner diameter of the lip segment 11 gradually decreases along the direction from the inlet to the outlet, which means that the inner surface of the lip segment 11 can be an arc-shaped transition surface, and its inner diameter gradually increases from the position where it is connected to the main body segment 12 to the inlet position, which is a gradually expanding segment.

[0034] The two ends of the stationary blade 4 are connected to the hub 5 and the inner peripheral wall of the duct 1, respectively, thereby improving the overall structural stability of the ducted fan. Since the inner surface of the lip region, which is also the leeward side of the lip, has a higher pressure and forms a pressure difference with the outer surface, multiple through holes 2 are arranged at intervals along the circumference of the lip section 11. In this way, the through holes 2 will play a role in depressurizing the airflow, that is, balancing the pressure difference between the inner and outer surfaces of the lip section 11. When the airflow is about to enter the inlet of the duct 1 from a distance, a small part of the airflow flowing from the side of the duct 1 will flow directly into the flow channel through the through holes 2, without having to cross the lip section 11 to enter the leeward side (inner surface of the lip section). In this way, the multiple through holes 2 reduce the pressure difference between the inner and outer surfaces of the lip section 11, reduce the lateral drag of the ducted fan, and improve the propulsion efficiency of the ducted fan.

[0035] Optionally, the lip segment 11 can be provided with 36 through holes 2 in the circumferential direction, or other numbers of through holes 2, with multiple through holes 2 evenly arranged along the circumferential direction of the lip segment 11.

[0036] In addition, in this embodiment of the application, under the condition of no crosswind, a lip section 11 is provided with multiple through holes 2. When the moving blade 3 is started, most of the airflow enters from the inlet. At the same time, a small part of the airflow is also drawn in from the side of the duct body 1 through the through holes 2, thereby increasing the intake volume of the duct fan and improving the lift of the duct fan.

[0037] Optionally, the cross-section of the through hole 2 can be square, rectangular, circular, elliptical, or triangular, etc.

[0038] like Figure 2 As shown, in one embodiment, the through hole 2 has an opening 21 formed on the inner circumferential surface of the lip section 11. Along the axial direction, the size of the lip section 11 is L1, and the distance between the geometric center of the opening 21 and the inlet is L2, where 0.3≤L2 / L1≤0.8.

[0039] Optionally, since the inner surface of the lip segment 11 is an arc-shaped curved surface and the outer surface is an inclined curved surface, the dimension L1 of the lip segment 11 is the straight-line distance from the opening 21 of the lip segment 11 to the connection with the main body segment 12.

[0040] Optionally, since the through hole 2 is through the lip section 11, the opening 21 can be the cross-section of the through hole 2. If the through hole 2 is a cuboid space, then the opening 21 is rectangular.

[0041] Optionally, the geometric center of opening 21 is the center position of through hole 2.

[0042] Since the size of the lip section 11 is L1, the distance between the geometric center of the opening 21 and the inlet is L2, and 0.3≤L2 / L1≤0.8, it is equivalent to the setting position of the through hole 2 being close to the main body section 12 of the lip section 11. The opening position is also in the flow stagnation zone, which can maximize the balance of the pressure difference of the airflow on the inner and outer surfaces of the lip section 11.

[0043] In one embodiment, the circumferential dimension of the through hole 2 along the lip section 11 is L3, and the axial dimension of the through hole 2 is L4, where 0.1≤L4 / L3≤1.

[0044] Optionally, if the through hole 2 is rectangular, the circumferential dimension of the through hole 2 along the lip section 11 is the long side, and the axial dimension of the through hole 2 refers to the axial height along the duct body 1.

[0045] The circumferential dimension of the through hole 2 along the lip section 11 is L3, and the axial dimension of the through hole 2 is L4. 0.1≤L4 / L3≤1, which means that the cross-sectional shape of the through hole 2 can be square, rectangular, circular, or elliptical. Since the circumferential dimension of the through hole 2 along the lip section 11 is not less than the axial dimension, the through hole 2 should extend along the circumferential direction of the duct body 1 as much as possible, rather than extending axially. If the axial dimension of the through hole 2 continues to extend along the axial direction of the duct body 1, it means that the through hole 2 will gradually extend to the main body section 12, and then the through hole 2 will not be able to play the role of balancing the internal and external air pressure.

[0046] In one implementation, the rotating blade 3 can cause the airflow to flow from the inlet to the outlet when it rotates in the first direction; when the rotating blade 3 rotates in the first direction, the direction of the aerodynamic torque of the airflow on the rotating blade 3 is consistent with the direction of the aerodynamic torque of the airflow on the stationary blade 4.

[0047] Optionally, the first direction can be clockwise, or it can be counterclockwise.

[0048] Optionally, in the prior art, the aerodynamic torque of the stationary blade 4 is generally opposite to that of the moving blade 3. That is, the aerodynamic torque of the stationary blade 4 will cancel out part of the aerodynamic torque of the moving blade 3. This will affect the attitude adjustment of the ducted fan under the same power output and result in lower sensitivity.

[0049] By aligning the direction of the aerodynamic torque of the airflow on the moving blade 3 with the direction of the aerodynamic torque of the airflow on the stationary blade 4, the aerodynamic torque of the stationary blade 4 no longer cancels out the aerodynamic torque of the moving blade 3. This increases the aerodynamic torque for adjusting the ducted fan, making it easier to adjust the flight attitude of the ducted fan.

[0050] Optionally, when the moving blade 3 rotates in the first direction, the aerodynamic torque of the airflow on the moving blade 3 is directed in the second direction.

[0051] Optionally, ducted fans are typically symmetrically arranged on drones. Therefore, the total aerodynamic torque of the symmetrically arranged ducted fans must be balanced.

[0052] In one embodiment, along the thickness direction of the stationary blade 4, the two opposing surfaces of the stationary blade 4 are a first arc-shaped surface 41 and a second arc-shaped surface 42, respectively. The curvature of the first arc-shaped surface 41 is greater than the curvature of the second arc-shaped surface 42, and the second arc-shaped surface 42 faces the first direction.

[0053] Optionally, the second arc-shaped surface 42 facing the first direction means that airflow is generated along the second direction along the first direction, that is, the rotation direction of the moving blade 3. The second direction and the first direction are two opposite directions. The airflow passes through the second arc-shaped surface 42 first, and then passes through the first arc-shaped surface 41.

[0054] like Figure 1 As shown, along the thickness direction of the stationary blade 4, the two opposing surfaces of the stationary blade 4 are the first arc-shaped surface 41 and the second arc-shaped surface 42, respectively. The second arc-shaped surface 42 faces the first direction, and the first arc-shaped surface 41 faces the second direction. The curvature of the first arc-shaped surface 41 is greater than the curvature of the second arc-shaped surface 42. Thus, the lift force on the stationary blade 4 is also in the second direction. At the same time, when the moving blade 3 rotates in the first direction, the aerodynamic torque of the airflow on the moving blade 3 is also in the second direction. In this way, the aerodynamic torque of the moving blade 3 and the stationary blade 4 are in the same direction, so the stationary blade 4 will not cancel out part of the aerodynamic torque of the moving blade 3, thereby making it easier to flexibly adjust the flight attitude of the ducted fan.

[0055] In one embodiment, the diameter of the rotating surface formed by the rotating blade 3 is D, and the axial dimension of the duct body 1 is L5, where 0.2≤L5 / D≤0.3.

[0056] The existing ducted fan has a large axial height of the duct body 1 and a high shaft-to-diameter ratio (the ratio of the axial height of the duct body 1 to the diameter of the rotating surface formed by the rotating blades 3), resulting in an excessively large lateral projected area. Under flight conditions such as crosswinds or forward flight, the lateral drag generated by the crosswinds is too large.

[0057] By controlling the ratio of the axial dimension of the duct 1 to the diameter of the rotating surface formed by the rotating blade 3 within the range of 0.2 to 0.3, the axial dimension of the duct 1 is reduced while the diameter of the rotating blade 3 remains unchanged. This reduces the shaft-to-diameter ratio and consequently the lateral projected area of ​​the duct 1. Under flight conditions such as crosswinds or forward flight, the lateral drag caused by crosswinds is reduced.

[0058] In one implementation, the axial height of the duct body 1 is 200mm≤L5≤250mm.

[0059] The original duct body 1 had an axial height of 339mm. The axial height of the current duct body 1 has been reduced, thereby reducing the side projection area.

[0060] In one implementation, the minimum axial distance between the stationary blade 4 and the moving blade 3 is 80 mm.

[0061] In this way, compared with the existing technology, the distance between the stationary blade 4 and the moving blade 3 is reduced, which is equivalent to reducing the axial height of the ducted fan and also reducing the weight of the ducted fan.

[0062] In the prior art, the axial distance between the stationary blade 4 and the moving blade 3 is about 110 mm.

[0063] Optionally, the minimum axial distance between the stationary blade 4 and the moving blade 3 can be the distance between the root of the stationary blade 4 and the root of the moving blade 3; that is, the axial distance between the geometric center of the root of the stationary blade 4 and the geometric center of the root of the moving blade 3 is reduced from the original 110mm to the current 80mm.

[0064] like Figures 1 to 3 As shown, in one embodiment, the front end of the hub 5 is provided with an air intake cap 7, and the rear end of the hub 5 is provided with an exhaust cone 8. Along the axial direction, the front end is closer to the inlet than the rear end.

[0065] Optionally, the front end of the hub 5 refers to the end facing the inlet of the duct body 1, and the rear end refers to the end facing the outlet.

[0066] like Figure 1 and 2 As shown, optionally, a rotating seat 6 is fixedly connected to the front end of the hub 5. The rotating seat 6 is connected to the moving blades 3. The motor can drive the rotating seat 6 and multiple moving blades 3 to rotate synchronously. The air intake cap 7 is set at the front end of the rotating seat 6.

[0067] By setting the air intake cap 7, it is beneficial to improve the flow velocity field distribution when the airflow flows into the duct body 1, reduce flow loss, and improve aerodynamic efficiency. By setting the exhaust cone 8, it is beneficial to improve the flow velocity field distribution when the airflow flows out of the duct fan, reduce flow loss, and improve aerodynamic efficiency.

[0068] Secondly, embodiments of this application also provide a fire-fighting ducted fan drone 9, which includes the ducted fan provided in the first aspect.

[0069] Optionally, the ducted fan drone 9 includes a support beam extending longitudinally, and at least three ducted fans are provided on each side along the width direction perpendicular to the length direction of the support beam. In this way, the ducted fans are arranged on the support beam, so that the ducted fan drone 9 extends along the length direction as a whole, forming a longitudinal structure, which allows the ducted fan drone 9 to pass through narrow areas. At least three ducted fans are provided on each side of the width direction of the support beam to meet the power load, and a fire monitor is provided on the support beam. The fire monitor can be connected to the water hose and can spray fire extinguishing agent, enabling the ducted fan drone 9 to perform high-altitude fire fighting operations.

[0070] Optionally, in some cases, the ducted fan drone 9 can also exist in another form, including a support beam with at least four ducted fans on one side. The support beam provides structural support for the ducted fans, and the partial arrangement of the ducts also makes the ducted fan drone 9 a longitudinally elongated structure, reducing the width space occupied by the ducted fan drone 9. Using a multi-ducted fan drone 9 can further improve the load capacity of the ducted fan drone 9. With a larger number of ducted fans, when one ducted fan on one side of the support beam fails, the other ducted fans on the same side can compensate for the corresponding lift, making the ducted fan drone 9 easier to control, and also improving the risk resistance and stability of the ducted fan drone 9.

[0071] Optionally, the ducted fan drone 9 also includes a folding mechanism. By setting up the folding mechanism, the ducted fan can be folded along its length or width, thereby reducing the space required for the ducted fan drone 9 and facilitating transportation and placement. The folding mechanism includes a first connector and a second connector that are rotatably connected. The first connector and the second connector are respectively connected to two ducted fans, allowing the ducted fans to rotate for easy folding. The folding mechanism also includes a drive assembly that is connected to the first connector and the second connector. At the same time, the drive assembly can drive the second connector to rotate relative to the first connector, thereby causing the ducted fan connected to the second connector to rotate, thus realizing the folding of the ducted fan.

[0072] like Figure 4As shown, this application embodiment also provides a fire truck, including: a housing 10 for storing and protecting other system modules; a liquid tank 13 for storing fire extinguishing agent for fire extinguishing; a power generation module 16 electrically connected to a ducted fan drone 9 to provide power to the ducted fan drone 9, enabling it to carry a water hose for fire extinguishing; a mooring cable reel 15 electrically connected to both the power generation module 16 and the ducted fan drone 9, allowing the power generated by the power generation module 16 to be transmitted to the ducted fan drone 9; and a water pump system 14 for outputting the fire extinguishing agent from the liquid tank 13. The fire is extinguished by spraying water from a fire monitor; the support platform 17 is located above the liquid tank 13; the liquid tank 13, the water pump system 14, and the tethered cable reel 15 are arranged along the same length of the housing 10 and are all located below the housing 10; the power generation module 16 is located on one side of the tethered cable reel 15; the housing 10 and the support platform 17 form a space for accommodating the ducted fan UAV 9, thereby making the layout of the various components in the housing 10 of this embodiment reasonable, highly integrated, and able to increase the flow rate of the extinguishing agent. It is small in size, easy to transport or place, reduces the space occupied in the width direction of the housing 10, and can pass through narrow spaces during transportation, thus improving adaptability.

[0073] Optionally, the generator module 16 can be located behind the fire truck cab, and the liquid tank 13 can be located at the rear of the housing 10. Since the liquid tank 13 stores extinguishing agent and is relatively heavy, and the generator module 16 also has a certain weight, placing the generator module 16 behind the cab and the liquid tank 13 at the rear of the housing 10 can balance the weight of the entire fire truck and ensure stability when driving it. This layout is also more efficient and improves space utilization. The mooring cable reel 15 is located behind the generator module 16, shortening the distance between them and facilitating connection. The water pump system 14 is located between the mooring cable reel 15 and the liquid tank 13. This efficient layout also shortens the distance between the water pump system 14 and the liquid tank 13, reducing pipe connections and making the fire-fighting equipment more compact, improving space utilization and allowing it to pass through narrow areas, thus increasing fire-fighting efficiency.

[0074] Optionally, the power generation module 16 is configured in the generator compartment. The power generation module 16 includes a generator. The fire truck is also equipped with a hydraulic cylinder. The fuel in the hydraulic cylinder is supplied to the engine through a fuel supply system. The fuel can be gasoline. The engine is driven by burning gasoline. The output shaft of the engine and the input shaft of the generator are coaxially fixed. The engine drives the generator to generate electrical energy. This electrical energy is distributed through a hybrid power control module. Depending on the actual working conditions, it can provide power to the ducted fan UAV 9, or it can provide energy to other components that require power.

[0075] Optionally, the ducted fan drone 9 is equipped with a fire monitor, which can be connected to the liquid tank 13, and the fire extinguishing agent in the liquid tank 13 can be sprayed out through the fire monitor.

[0076] Optionally, the housing 10 includes four side walls and a top cover located above the side walls. The top cover can be opened by a hydraulic or electric push rod to facilitate the flight of the ducted fan drone 9.

[0077] like Figure 4 As shown, the fire truck also includes a lifting mechanism 18, which is installed on the fire truck and can be used to place the ducted fan drone 9 from the fire truck to the ground, or to place the ducted fan drone 9 from the ground onto the fire truck, so as to achieve high-efficiency movement of the ducted fan drone 9 and reduce the cost of manual handling.

[0078] Optionally, in some special environments, the ducted fan drone 9 may not be able to land accurately on the lifting mechanism 19 and the support platform 17. Therefore, the ducted fan drone 9 can be lifted by the lifting mechanism 18 and placed on the lifting mechanism 19; or the ducted fan drone 9 can be lifted by the lifting mechanism 18 and placed on the ground platform.

[0079] Optionally, the fire-fighting superstructure also includes a lifting mechanism 19, which is connected to the housing 10 and the support platform 17 and is located above the liquid tank 13 to improve space utilization. The lifting mechanism 19 can lift the ducted fan drone 9 to a height above the housing 10, avoiding the housing 10 from obstructing the ducted fan drone 9 and facilitating the flight of the ducted fan drone 9.

[0080] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

[0081] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0082] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A ducted fan, characterized in that, include: A duct body, with internal flow channels; The hub, stationary blades, and moving blades are all disposed within the flow channel. The stationary blades connect the hub and the duct body, and the moving blades are rotatably disposed on the hub. The duct includes a main body section and a lip section arranged and connected along the axial direction. Along the axial direction, the end of the lip section opposite to the main body section forms the inlet of the duct, and the end of the main body section opposite to the lip section forms the outlet of the duct. The inner diameter of the lip section gradually decreases along the direction from the inlet to the outlet. The lip section is provided with a plurality of through holes, which are spaced apart circumferentially along the lip section.

2. The ducted fan according to claim 1, characterized in that, The through hole forms an opening on the inner circumferential surface of the lip section. Along the axial direction, the dimension of the lip section is L1, and the distance between the geometric center of the opening and the inlet is L2, where 0.3≤L2 / L1≤0.

8.

3. The ducted fan according to claim 1 or 2, characterized in that, The circumferential dimension of the through hole along the lip segment is L3, and the axial dimension of the through hole is L4, where 0.1 ≤ L4 / L3 ≤ 1.

4. The ducted fan according to claim 1 or 2, characterized in that, The rotating blades in the first direction enable airflow to flow from the inlet to the outlet; When the moving blade rotates along the first direction, the direction of the aerodynamic torque of the airflow on the moving blade is the same as the direction of the aerodynamic torque of the airflow on the stationary blade.

5. The ducted fan according to claim 4, characterized in that, Along the thickness direction of the stationary blade, the two opposite surfaces of the stationary blade are a first arcuate surface and a second arcuate surface, respectively. The curvature of the first arcuate surface is greater than the curvature of the second arcuate surface, and the second arcuate surface faces the first direction.

6. The ducted fan according to claim 5, characterized in that, The diameter of the rotating surface formed by the rotating blade is D, and the axial dimension of the duct is L5, where 0.2≤L5 / D≤0.

3.

7. The ducted fan according to claim 6, characterized in that, The axial height of the culvert is 200mm≤L5≤250mm.

8. The ducted fan according to claim 1 or 2, characterized in that, The minimum distance between the stationary blade and the moving blade along the axial direction is 80 mm.

9. The ducted fan according to claim 1 or 2, characterized in that, The front end of the wheel hub is provided with an air intake cap, and the rear end of the wheel hub is provided with an exhaust cone. Along the axial direction, the front end is closer to the inlet than the rear end.

10. A ducted fan drone for firefighting, characterized in that, Includes the ducted fan as described in any one of claims 1 to 9.

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