Unmanned aerial vehicle for preventing crops from being frosted

Abstract

The utility model discloses an unmanned aerial vehicle for preventing crops from being frosted, and relates to the technical field of crop frost prevention. Comprising a main machine and rotor wings, the rotor wings are supported around the main machine through supporting arms, motors are correspondingly arranged below the rotor wings respectively, the rotor wings are installed on output shafts of the motors, and guide cylinders in one-to-one correspondence with the rotor wings are further included; the axes of the guide cylinders coincide with the rotating center lines of the rotors, the rotors are located at the upper ends of the inner side spaces of the guide cylinders, and first conical surfaces are machined on the inner sides of the lower ends of the guide cylinders. A cone is arranged in the guide cylinder and corresponds to the space below the rotor wing, a conical surface is also machined on the outer side of the cone, and the conical surface is matched with the conical surface on the inner side of the guide cylinder to form an airflow channel. According to the anti-frost unmanned aerial vehicle, the guide cylinders are arranged on the outer sides of the rotors of the unmanned aerial vehicle, so that airflow blown by the rotors to the lower side is more gathered, the efficiency of stirring air on the earth surface is enhanced, and the working efficiency of the unmanned aerial vehicle in crop anti-frost work is improved.

Description

Technical Field

[0001] This utility model relates to the field of crop frost protection technology, and in particular to a drone for preventing crop frost damage. Background Technology

[0002] Frost is a meteorological disaster that can cause crop yield reduction or even death. Traditional frost prevention methods for crops mainly rely on ground-based methods such as smoke fumigation, irrigation, or mulching, which suffer from low efficiency, high environmental pollution, and difficulty in large-scale, rapid implementation. With the development of precision agriculture, drone technology has begun to be applied to frost prevention, using the downdraft generated by the rotors to stir up the near-surface air layer and slow down heat loss from the ground. However, existing technologies still face significant technical bottlenecks in practical applications:

[0003] When conventional multi-rotor drones operate, the airflow generated by each rotor diffuses radially in free space, resulting in an airflow velocity attenuation rate of over 60% at a distance of 1 meter from the rotor center. This dispersion effect creates a conflict between the effective operating area and the airflow intensity, making it difficult to maintain sufficient heat exchange efficiency over a large operating range. In other words, current technologies for drones have poor efficiency in implementing anti-frost technology and require improvement. Utility Model Content

[0004] This invention provides a drone for preventing frost damage to crops, with the aim of improving the efficiency of the drone in frost prevention technology by modifying its structure.

[0005] The technical problem solved by this utility model is achieved by the following technical solution: This utility model provides a drone for preventing frost damage to crops, including a main unit and rotors. Each rotor is supported around the main unit by a support arm. Each rotor is equipped with a motor below it. The rotors are mounted on the output shaft of the motors. The drone also includes a guide tube corresponding to each rotor.

[0006] The axis of the guide tube coincides with the rotation center line of the rotor. Each rotor is located at the upper end of the inner space of each guide tube. The inner side of the lower end of the guide tube is machined with a first conical surface, with the small end of the first conical surface facing upward and the large end facing downward.

[0007] As a preferred option, a cone is provided inside the guide tube, corresponding to the space below the rotor. The outer side of the cone is machined with a second conical surface with the small end facing up and the large end facing down. The second conical surface and the first conical surface cooperate with each other to form a gradually narrowing airflow channel.

[0008] As a preferred embodiment, the motor is installed inside the cone, and the output shaft of the motor extends from the upper end of the cone and is connected to the rotor.

[0009] As a preferred solution, an electric heating element is arranged in the side wall of the flow guide cylinder, and when the electric heating element is powered on, heat is conducted to the inside space of the flow guide cylinder, so that the temperature of the airflow inside the flow guide cylinder can be increased.

[0010] As a preferred solution, the bottom of the main machine is provided with a counterweight for adjusting the weight of the main machine, and the number of counterweights can be adjusted.

[0011] The beneficial effects of the present application are:

[0012] 1. The flow guide cylinder is arranged on the outside of the unmanned aerial vehicle rotor, so that the airflow blown by the rotor below is more concentrated, the flow direction is more determined, the stirring efficiency of the ground air is enhanced, and the working efficiency of the unmanned aerial vehicle in the crop frost prevention work is improved.

[0013] 2. The first conical surface is arranged on the inside of the lower end of the flow guide cylinder, so that the airflow in the flow guide cylinder is disturbed when flowing out downward, thereby further promoting the stirring efficiency of the airflow on the ground air.

[0014] 3. The electric heating element is arranged in the side wall of the flow guide cylinder, and the electric heating element can heat the air in the flow guide cylinder, so that the flow guide cylinder sprays hot air downward, which can warm the ground air and further improve the frost prevention effect.

[0015] 4. The number of counterweights can be adjusted, and the change of the counterweight can provide different air volume when the unmanned aerial vehicle flies at a fixed height, so as to adapt to different use scenes. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the overall structure schematic diagram of the present application.

[0017] In the figure: 1, flow guide cylinder; 2, rotor; 3, electric heating element; 4, support arm; 5, main machine; 6, counterweight; 7, cone; 8, first conical surface; 9, second conical surface. DETAILED DESCRIPTION

[0018] The present application will be further described below in combination with the drawings.

[0019] As Figure 1As shown, this embodiment includes a main unit 5 and rotors 2. The main unit 5 houses a flight controller, camera, sensors, lidar, millimeter-wave radar, satellite positioning device, power supply system, etc. Each rotor 2 is supported around the main unit 5 by support arms 4. A motor is correspondingly located below each rotor 2, and the rotor 2 is mounted on the output shaft of the motor. The above structure is a conventional structure in the prior art. In this embodiment, the rotor 2 can adopt a variable-pitch three-bladed propeller structure, fixed to the motor output shaft by nuts. The motor is a brushless motor, connected to the power supply system inside the main unit 5 through a waterproof connector.

[0020] like Figure 1 As shown, this embodiment also includes a deflector 1 corresponding to each rotor 2, used to guide the airflow blown downwards by the rotor 2, making the airflow blown downwards by the rotor 2 more concentrated and the flow direction more definite, enhancing the agitation efficiency of the ground air, thereby improving the working efficiency of the UAV in crop frost prevention. The deflector 1 is made of cast aluminum alloy, and the axis of the deflector 1 coincides with the rotation center line of the rotor 2. Each rotor 2 is located at the upper end of the inner space of each deflector 1. A first conical surface 8 is machined on the inner side of the lower end of the deflector 1, with the small end of the first conical surface 8 facing upwards and the large end facing downwards. The setting of the first conical surface 8 causes disturbance when the airflow in the deflector 1 flows downwards, thereby further promoting the agitation efficiency of the airflow on the ground air. In this embodiment, the cone angle α of the first conical surface 8 is 15°, and the surface is anodized.

[0021] like Figure 1 As shown, in this embodiment, a cone 7 is disposed inside the guide tube 1, corresponding to the space below the rotor 2. A second conical surface 9 with the small end facing upward and the large end facing downward is machined on the outer side of the cone 7. The second conical surface 9 and the first conical surface 8 cooperate with each other to form a gradually narrowing airflow channel. In this embodiment, the cone angle β of the second conical surface 9 is 20°.

[0022] like Figure 1 As shown, the motor is installed inside the cone 7, and the output shaft of the motor extends from the upper end of the cone 7 and is connected to the rotor 2.

[0023] like Figure 1 As shown, an electric heating element 3 is installed inside the side wall of the guide tube 1. When the electric heating element 3 is energized, heat is conducted to the inner space of the guide tube 1, thereby increasing the temperature of the airflow inside the guide tube 1. This causes the guide tube 1 to spray hot air downwards, thus raising the surface air temperature and further improving the anti-frost effect. In this embodiment, the electric heating element 3 is a nickel-chromium alloy heating wire 13 (power density 15W / cm²), which is connected to the main unit 5 power supply through a PID temperature control module.

[0024] like Figure 1As shown, the bottom of the main unit 5 is provided with counterweights 6 for adjusting the weight of the main unit 5, and the number of counterweights 6 can be adjusted. The change in counterweight allows the drone to provide different airflow rates when flying at a fixed altitude, thus adapting to different usage scenarios. In this embodiment, the counterweights 6 are made of a high-density tungsten alloy, with a single weight of one kilogram.

Claims

1. A drone for preventing frost damage to crops, comprising a main unit (5) and rotors (2), each rotor (2) being supported around the main unit (5) by a support arm (4), and each rotor (2) having a corresponding motor disposed below it, the rotors (2) being mounted on the output shaft of the motor, characterized in that, It also includes a deflector (1) corresponding to each rotor (2); The axis of the guide tube (1) coincides with the rotation center line of the rotor (2). Each rotor (2) is located at the upper end of the inner space of each guide tube (1). The inner side of the lower end of the guide tube (1) is machined with a first conical surface (8). The small end of the first conical surface (8) faces upward and the large end faces downward.

2. The drone for preventing crop frost damage according to claim 1, characterized in that: Inside the guide tube (1), a cone (7) is provided corresponding to the space below the rotor (2). The outer side of the cone (7) is machined with a second cone surface (9) with the small end facing up and the large end facing down. The second cone surface (9) and the first cone surface (8) cooperate with each other to form a gradually narrowing airflow channel.

3. The drone for preventing crop frost damage according to claim 2, characterized in that: The motor is installed inside the cone (7), and the output shaft of the motor extends from the upper end of the cone (7) and is connected to the rotor (2).

4. The drone for preventing crop frost damage according to claim 1, characterized in that: The guide tube (1) is provided with an electric heating element (3) inside its side wall. When the electric heating element (3) is powered on, the heat is conducted to the inner space of the guide tube (1), thereby increasing the temperature of the airflow inside the guide tube (1).

5. The drone for preventing crop frost damage according to claim 1, characterized in that: The bottom of the host (5) is provided with a counterweight (6) for adjusting the weight of the host (5), and the number of counterweights (6) can be adjusted.

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