A high air volume conditioning unit of low power and low weight

Abstract

The application discloses a low-power and low-weight high-air-volume adjusting device, and belongs to the technical field of aerospace vehicles. The low-power and low-weight high-air-volume adjusting device is used for realizing air volume adjustment of a stratosphere float vehicle, and comprises a fan and a motor. The impeller of the fan adopts a mixed flow blade type, and the blades of the impeller are backward type blades. The upper wind cover and the lower wind cover are both volute-shaped. The upper wind cover is provided with an air inlet, the lower wind cover is provided with a motor assembly hole, the impeller is located between the upper wind cover and the lower wind cover, the upper wind cover and the lower wind cover are sealingly and fixedly connected, and an air flow channel is formed. The motor is connected with the impeller through the assembly hole of the lower wind cover. The air outlet of the fan is sealingly connected with the air inlet of the stratosphere float vehicle through a valve. The low-power and low-weight high-air-volume adjusting device has a simple structure, a wide adjustable rotating speed range, good temperature management and perfect control design, and can meet the working requirements of the float vehicle in different task scenes from the near ground to the 20km high altitude.

Description

Technical Field

[0001] This invention relates to the field of aerospace vehicle technology, and more specifically to a low-power and low-weight high-airflow regulation device. Background Technology

[0002] Compared to other aircraft, airships have advantages such as large payload, long hovering time, high safety, and low cost. Hot air balloons, soft-sided and semi-rigid airships can all be classified as differential pressure airships. They need to maintain a certain internal and external pressure difference, so during descent, an air volume regulation device is required to overcome the pressure difference and force ambient air into the airbag.

[0003] For stratospheric airships to achieve long-term aloft operation and reusability, the entire process of ascent, aloft stay, and descent is crucial. A reliable and effective airflow regulation system, which can be considered the airship's "breathing system," can meet the airship's morphological and pressure differential requirements at each stage. Key components of the airflow regulation system mainly include valves and fans. Valves allow high-pressure gas inside the bladder to be discharged to the outside, while fans are needed to blow ambient air into the airship's air bladder.

[0004] The fans used in the airflow regulation device of a stratospheric airship need to effectively pump ambient air into the airship's air bladder across the entire altitude range from 20 km to near the ground. Compared to conventional fans, these fans exhibit greater variation in fluid medium properties (the ambient temperature at 20 km is typically 216.6 K, 70 K lower than the ground temperature; air density is 0.08891 kg / m³). 3 The density of air at ground level is 1 / 13.8 of that at ground level. The limitations to overcome include a small pressure differential (<1000 Pa) and a relatively constant input power for the fan motor; that is, as altitude decreases, the density of the gas at the fan inlet increases, and the fan's rotational speed decreases. Currently, there are very few mature, high-efficiency fans that can meet the specific requirements of stratospheric airships, and research on their characteristics and design is also limited. Therefore, the fans required for the airflow regulation devices of stratospheric airships need to be specifically designed and developed according to their operating conditions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a low-power and low-weight high-air volume regulating device that can meet the entire altitude range from 20km to near the ground, adjust the air volume according to actual needs, and ensure a low failure rate.

[0006] This invention provides a low-power and low-weight high-altitude air volume regulation device for regulating the air volume of a stratospheric airship. It includes a fan and a motor. The fan comprises an impeller, an upper shroud, and a lower shroud. The impeller adopts a mixed-flow blade design, and the blades are backward-curved. Both the upper and lower shrouds are volute-shaped. The upper shroud has an air inlet, and the lower shroud has a motor mounting hole. The impeller is positioned between the upper and lower shrouds, which are sealed and fixedly connected, forming an airflow channel. The motor is connected to the impeller through the mounting hole of the lower shroud and is used to drive the fan to rotate; the air outlet of the fan is sealed to the air inlet of the stratospheric airship through a valve.

[0007] Preferably, the blade thickness is 1.0-1.2 mm, the blade wrap angle is 55-65°, the blade inlet angle is 35-45°, and the blade outlet angle is 55-65°.

[0008] Preferably, the motor is a brushless DC motor with a working voltage of 24VDC, a rated power of 120W, an adjustable speed, and a maximum speed of 16900rpm.

[0009] Preferably, the valve uses a miniature reversible DC drive motor with a power of 5W, and a reed switch constant temperature heater with a heating power of 10W is installed on the housing to heat at temperatures below -40°C.

[0010] Preferably, it also includes a controller connected to the motor and valve signals. The controller is used to receive instructions from the host computer and to regulate the starting and closing of the motor and valve according to the instructions, and can also adjust the motor speed.

[0011] Preferably, it also includes a flexible polyimide heating film, which is disposed inside the motor housing and control box for heating the motor and controller.

[0012] Preferably, the motor housing has a double-layer structure, with the outer layer filled with liquid polyurethane foaming agent to form a polyurethane insulation layer, thereby achieving heat preservation of the motor.

[0013] Preferably, a pearl cotton heat insulation felt is provided inside the control box. The pearl cotton heat insulation felt is pasted in multiple layers inside the control box with foam adhesive to achieve heat preservation of the controller.

[0014] Preferably, the impeller is made of aluminum alloy.

[0015] Preferably, the upper and lower wind shields are made of magnesium alloy.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The impeller of this invention adopts a mixed-flow blade profile and a closed design. The blades are backward-curved, with a cross-section similar to an airfoil, resulting in excellent aerodynamic performance, large air volume, low pressure, and high efficiency (reaching 80% to 90%). It is also less prone to scaling and maintains a certain range of power variation under high flow conditions, providing some protection for the fan equipment. While meeting strength and rigidity requirements, the impeller is made of aluminum alloy and CNC machined, with blades as thin as possible to reduce the fan weight. When the number of blades is 9, the blade thickness is 1.2mm, the blade inlet angle is 40°, the outlet angle is 60°, the blade wrap angle is 60°, and the impeller 101 has an inlet diameter of 45mm, an outlet diameter of 135mm, and an outlet diameter of 38mm, it can meet the requirement of a 248m³ airflow rate at an altitude of 20km, with the regulating device at rated power and a pressure difference of 500Pa. 3 It meets the requirements of / h (69L / s) and can also meet the requirement of mass ≤2.5kg.

[0017] This invention provides a low-power, low-weight high-air volume regulating device. Based on actual needs, when the airship needs to ascend, the controller opens the valve and starts the motor, which in turn drives the fan to blow air from the outside environment into the airship's air bladder through the valve. When the airship needs to remain stationary, the controller stops the motor and closes the valve to maintain a constant pressure inside the air bladder. When the airship needs to descend, with the motor stopped, the controller opens the valve to release the high-pressure gas inside the bladder to the outside. During the airship's movement, the controller collects ambient temperature information and, under certain conditions, activates the heating device to ensure the air volume regulating device operates normally. The motor of this invention is a DC brushless motor with a working voltage of 24VDC, a rated power of 120W, a maximum speed of 16900rpm, and adjustable speed. The valve has an automatic heating function. The fan, while meeting strength and rigidity requirements, is made of low-density alloy material, resulting in a low weight. Therefore, this air volume regulating device has a simple structure, a wide adjustable speed range, good temperature management, and a perfect control design, which can meet the working requirements of airships in different mission scenarios from near the ground to 20km altitude. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural diagram of the fan of the present invention; Figure 3 This is a side view of the fan of the present invention; Figure 4 This is a cross-sectional view of the fan impeller of the present invention; Figure 5The PQ curve obtained from the numerical simulation of the wind turbine of this invention is shown at a height of 2km and a rotational speed of 5500rpm. Figure 6 The PQ curve at a height of 20km and a speed of 16900rpm, obtained from the numerical simulation of the wind turbine of this invention; Figure 7 The measured PQ curve and power curve of the fan of this invention are without valves, at an altitude of 0km and a speed of 4600rpm.

[0019] Explanation of reference numerals in the attached figures 1. Fan, 101. Impeller, 102. Upper shroud, 103. Lower shroud, 104. Air outlet, 105. Air inlet, 2. Motor, 3. Valve, 6. Motor housing, 7. Control box. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1-7 The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] like Figure 1-4 As shown, the present invention provides a low-power and low-weight high-altitude air volume regulation device for regulating the air volume of a stratospheric airship. It includes a fan 1 and a motor 2. The fan 1 includes an impeller 101, an upper shroud 102, and a lower shroud 103. The impeller 101 adopts a mixed-flow blade design, and the blades of the impeller 101 are backward-curved blades. Both the upper shroud 102 and the lower shroud 103 are volute-shaped, with a circular cross-sectional shape. The upper shroud 102 has an air inlet 105, and the lower shroud 103 has a motor mounting hole. The impeller 101 is located between the upper shroud 102 and the lower shroud 103, which are sealed and fixedly connected to form an airflow channel. The motor 2 is connected to the impeller 101 through the mounting hole of the lower shroud 103 and is used to drive the fan 1 to rotate; the air outlet 104 of the fan 1 is sealed to the air inlet of the stratospheric airship through the valve 3.

[0022] Preferably, the blade thickness is 1.0-1.2 mm, the blade wrap angle is 55-65°, the blade inlet angle is 35-45°, and the blade outlet angle is 55-65°.

[0023] As another preferred embodiment, the fan 1 has 9 blades, the blade thickness is 1.2mm, the blade inlet angle is 40°, the outlet angle is 60°, the blade wrap angle is 60°, and the impeller 101 has an inlet diameter of 45mm, an outlet diameter of 135mm, and an air outlet 104 has a diameter of 38mm.

[0024] Preferably, the motor is a brushless DC motor with a working voltage of 24VDC, a rated power of 120W, an adjustable speed, and a maximum speed of 16900rpm.

[0025] Preferably, the valve 3 uses a miniature reversible DC drive motor with a power of 5W, and a reed switch constant-temperature heater is installed on the housing. The valve 3 is an electric shut-off valve made of lightweight non-metallic PP material, with an optional model T / SXDF-30. To prevent motor stalling at low temperatures, a reed switch constant-temperature heater with a heating power of 10W is also installed on the housing of the miniature reversible DC drive motor. This heater automatically heats up when the temperature is below -40℃, protecting the motor from freezing and stalling.

[0026] Preferably, the device also includes a controller connected to the motor 2 and the valve 3 via a signal connection. The controller is used to receive instructions from the host computer and to regulate the starting and closing of the motor 2 and the valve 3 according to the instructions. It can also adjust the motor speed.

[0027] Preferably, it also includes a flexible polyimide heating film, which is disposed inside the motor housing 6 and the control box 7 for heating the motor 2 and the controller.

[0028] This invention uses a flexible polyimide heating film, which is very thin, lightweight, insulating, and flexible, allowing it to be directly attached to the motor and circuit board for heating. The motor has a large heat capacity but a small heat dissipation area, so the heating power does not need to be too high; the heating element can be attached to the side of the motor for heating. The control box has a relatively larger heat dissipation area and requires a larger heating power; multiple heating elements can be connected in series to achieve heating from multiple sides of the control box.

[0029] Preferably, the motor housing 6 has a double-layer structure, with the outer layer filled with liquid polyurethane foaming agent to form a polyurethane insulation layer 8, thereby achieving heat insulation of the motor 2. For motor insulation, since the motor housing is designed with a dedicated outer layer for filling the insulation layer, after multiple material selection tests, this embodiment uses liquid polyamide foaming agent, which can autonomously fill the outer layer during its foaming and expansion process, and has good structural strength and machinability after hardening.

[0030] Preferably, the control box 7 is lined with pearl cotton insulation felt, which is then bonded in multiple layers with foam adhesive to achieve heat insulation for the controller. Pearl cotton insulation felt is chosen for the control box 7 because of its low density; multiple layers bonded with foam adhesive achieve the required 1cm insulation thickness. In actual testing, it was found that wrapping the motor casing with pearl cotton also achieved good insulation.

[0031] Preferably, the impeller 101 is made of aluminum alloy material and is formed by CNC machining.

[0032] Preferably, the upper shroud 102 and the lower shroud 103 are made of magnesium alloy.

[0033] Example This invention provides a low-power and low-weight high-airflow regulating device, comprising a fan, a motor, a valve, a controller, and heating and insulation devices. The valve connects the fan outlet to the air buoy.

[0034] The fan mainly consists of an impeller, an upper shroud, and a lower shroud. The impeller adopts a mixed-flow blade design with a closed configuration, as shown in Figure 4. The blades are backward-curved, with a cross-section similar to an airfoil, resulting in excellent aerodynamic performance, large air volume, low pressure, and high efficiency (reaching 80%~90%). It is also less prone to scaling and maintains a certain range of power variation under high flow conditions, providing some protection for the fan equipment. While meeting strength and rigidity requirements, the impeller is made of aluminum alloy and CNC machined, with blades as thin as possible to reduce the fan's weight. In this embodiment, the fan 1 has 9 blades, each 1.2mm thick, with an inlet angle of 40°, an outlet angle of 60°, and a wrap angle of 60°. The impeller 101 has an inlet diameter of 45mm, an outlet diameter of 135mm, and an outlet diameter of 38mm. This design ensures that at an altitude of 20km, with the regulating device at rated power and a pressure difference of 500Pa, the airflow should reach 248m³ / s. 3 It meets the requirements of / h (69L / s) and can also meet the requirement of mass ≤2.5kg.

[0035] Both the upper and lower shrouds are designed in a volute shape with a circular cross-section for airflow. The upper shroud has an air inlet, and the lower shroud has a motor mounting hole. The impeller is located between the upper and lower shrouds. The upper and lower shrouds are secured with screws, welded, and glued to ensure airtightness and form an airflow channel. The upper and lower shrouds are also CNC machined. Because their strength and rigidity requirements are lower than those of the impeller, low-density magnesium alloy is used for the upper and lower shrouds to further reduce the fan's weight. This fan is characterized by high reliability, achieved through high efficiency, high speed, and excellent heat dissipation. Compared with similar products, this fan excels in these three aspects. High reliability is ensured by considering the impact of harsh environments on the fan, guaranteeing that the motor can still operate normally under severe conditions.

[0036] Motor: Connected to the fan impeller via mounting holes in the lower shroud, the motor drives the fan to draw ambient air into the air bladder of the airship, controlling its ascent. A Maxon brushless DC motor is selected, operating at 24VDC, with a rated power of 120W and a maximum speed of 16900rpm. The speed is adjustable to meet different fan flow requirements.

[0037] In this embodiment, the operating altitude of the air volume regulation device fan of the integrated emergency rescue aerobatic information platform is 16–26 km. The changes in average air pressure, average density, and average temperature from 0–30 km are as follows:

[0038] From 0 km to 16 km above ground, the average air pressure changes from 101.325 kPa to 10.275 kPa, becoming 10.14% of the ground level; the average air density changes from 1.225 kg / m³ to 0.16542 kg / m³, becoming 13.5% of the ground level; and the average air temperature changes from 15℃ to -56.5℃.

[0039] From 0 km to 20 km above ground, the average air pressure changes from 101.325 kPa to 5.466 kPa, becoming 5.4% of the ground level; the average air density changes from 1.225 kg / m³ to 0.088035 kg / m³, becoming 7.1% of the ground level; and the average air temperature changes from 15℃ to -56.5℃.

[0040] From 0 km to 26 km above ground, the average air pressure changes from 101.325 kPa to 2.125 kPa, becoming 2% of the ground level; the average air density changes from 1.225 kg / m³ to 0.033688 kg / m³, becoming 2.75% of the ground level; and the average air temperature changes from 15℃ to -51.6℃.

[0041] In order for wind turbines to meet the requirements of large operating conditions, research must be conducted from the following two aspects.

[0042] 1) Performance study of wind turbines with a speed range of 0-26km The operating environment of a fan varies significantly compared to the ground, and differs at each altitude. Consequently, the fan's head, flow rate, and power exhibit complex variations. Therefore, accurate analysis and design of the motor's high-altitude operating conditions are essential for precise fan design and control.

[0043] 2) Environmental adaptability study of wind turbines in the 0-26km range From 0km to 26km above ground, air pressure, air density, humidity, and temperature vary greatly. For safe and reliable operation, wind turbines must adapt to the working environment. On the one hand, the environmental adaptability of wind turbines must be precisely designed; on the other hand, comprehensive simulation tests must be conducted to ensure the wind turbines' environmental adaptability from 0km to 26km.

[0044] Numerical simulations revealed that the maximum deformation of the wind turbine impeller occurred at the outer edge of the impeller front cover, with a maximum deformation of 0.00847 mm. The maximum stress was observed at the blade root, with a maximum stress value of 14.177 MPa. The maximum strain was also observed at the blade root, consistent with expectations.

[0045] Figure 5 The PQ curve obtained from numerical simulation of the wind turbine at an altitude of 2km and a speed of 5500rpm; Figure 6 The PQ curves at an altitude of 20km and a speed of 16900rpm, obtained from numerical simulation of the wind turbine; Table 1 Simulated data of wind turbine at an altitude of 2km Table 2 Simulated data of wind turbine at an altitude of 20km Experimental demonstration Fan flow test Fan Design Requirements (1) The airflow rate blown in at an altitude of 20km under a pressure difference of 500Pa should reach 248m³. 3 / h; (2) At an altitude of 2km, the maximum static pressure is >1200Pa. The maximum static pressure requirement should be met first, followed by the flow rate requirement. However, at a static pressure of 500Pa, the flow rate must be at least greater than 50m³. 3 / h;

[0046] (3) The motor operating speed is <16900rpm, the input power is <90W, and the input voltage is 24VDC; (4) The torque meets the calibration requirements.

[0047] Test Plan (1) The 2km and 20km environments are difficult to obtain on the ground because the air density and viscosity are different; (2) The reliability of 2km and 20km was calculated by comparing the test data at 0km and the simulation data.

[0048] Test results under test conditions without valves Table 3 Actual test data at an altitude of 0km (Part 1) Table 4 Numerical simulation data at an altitude of 0km At an altitude of 0 km, the maximum flow rate is reached at 4600 rpm, at which point the motor also reaches its maximum torque capacity. The overall data error between numerical simulation and experimental measurement is controlled within 10%.

[0049] Table 5 Actual test data at an altitude of 0km (Part 2) At an altitude of 0 km, a static pressure of 1200 Pa can be achieved at a rotation speed of 5673 rpm. With zero flow, the rotation speed can reach a maximum of 9156 rpm, and the shut-off pressure is 3237 Pa, far exceeding the 1200 Pa static pressure limit and meeting the technical requirements.

[0050] Figure 7 shows the measured PQ and power curves at an altitude of 0 km and a speed of 4600 rpm. As can be seen from the figure, at higher motor speeds (such as 5500 rpm or higher), the PQ curve shifts upwards overall, and the maximum flow rate will be greater than the measured 83.57 m³ / h. 3 / h.

[0051] Figure 5 and Figure 6 PQ curves obtained from numerical simulations at an altitude of 2 km and a rotation speed of 5500 rpm, and at an altitude of 20 km and a rotation speed of 16900 rpm, are presented respectively. Referring to simulation and measured data at 0 km, we infer that at an altitude of 2 km and a flow rate of 0, the rotation speed will be greater than 9156 rpm, and the static pressure will be much higher than 1200 Pa. Meanwhile, at 0 km, a static pressure of 500 Pa, and a rotation speed of 4680 rpm, the actual flow rate is 67.4 m³ / s. 3 / h, much greater than 50m 3 / h. At an altitude of 2km, the simulation result is 101 m. 3 / h, and considering that the motor can reach at least 4680rpm at this altitude, the requirement is met. Similarly, the simulated airflow rate blown in at an altitude of 20km under a pressure difference of 500Pa is 294 m³ / h. 3 / h, which can meet 248 m 3 The / h index.

[0052] The valve operates at 24VDC and features a dual-way function. When the fan is running, the valve opens, allowing outside air to enter the air bladder of the airship. When the fan stops, the valve closes to maintain the air bladder pressure. Opening the valve when the fan stops allows the high-pressure gas inside the bladder to escape, facilitating the airship's descent. The valve itself uses a miniature reversible DC drive motor with a power of 5W. To prevent motor stalling at low temperatures, a reed switch constant-temperature heater with a heating power of 10W is installed on the motor housing. This heater automatically heats up below -40℃ to protect the motor from freezing and stalling, ensuring the valve functions normally.

[0053] Controller: Communicates via CAN bus, receives instructions from the host computer, and performs actions according to the instructions to realize the gas volume adjustment function and collect relevant information.

[0054] Heating and Insulation Devices: The air volume regulation device operates from near-ground altitude to 20km, with an ambient temperature range of -63℃ to +40℃. To ensure the normal operation of the motor and controller, these two components require heating and insulation. The heating solution is resistance heating, using a flexible polyimide heating film. This film is very thin, lightweight, insulating, and flexible, allowing it to be directly attached to the surface of the components to heat the motor and controller assembly, maintaining the surrounding environment at a temperature above 0℃. This heating device is powered by the floating platform's battery. A specially designed motor housing is used, with its outer layer filled with liquid polyurethane foam to form an insulation layer, thus insulating the motor. Pearl cotton insulation felt is selected and applied in multiple layers inside the control box using foam adhesive to insulate the controller.

[0055] This invention relates to a low-power and low-weight high-air volume regulating device, comprising a fan impeller 101 installed between an upper fan shroud 102 and a lower fan shroud 103. Both the upper and lower fan shrouds 102 and 103 are volute-shaped and are secured with screws, welded, and glued to ensure the airtightness of the fan and form an airflow channel. An air inlet 105 is provided on the upper fan shroud 102, and the end of the airflow channel is the air outlet 104. A valve 3 is connected to the air outlet 104 via a flange. A motor mounting port is provided on the lower fan shroud 103, through which the shaft of the motor 2 is connected to the fan impeller 101. A flexible polyimide heating film is attached to the surface of the motor 2, and a motor housing 6 is provided on the outside. Liquid polyurethane foaming agent is filled between the motor 2 and the motor housing 6 to form a polyurethane insulation layer. The controller of the air volume adjustment device for the airship is placed inside the control box 7. Pearl cotton heat insulation felt is pasted in multiple layers on the inside of the control box 7 with foam adhesive to form a heat insulation layer for the control box, thereby keeping the controller warm. The control box 7 is fixed to the fan cover with 6 screws.

[0056] When the airship needs to ascend, the host computer sends a corresponding command to the controller in control box 7, opening valve 3 and starting motor 2. This drives the fan impeller 101, drawing air from the outside environment into the airship's air bladder through the fan inlet 105, airflow channel, fan outlet 104, and valve 3. When the airship needs to remain stationary, the host computer sends a corresponding command to the controller in control box 7, stopping motor 2 and closing valve 3 to maintain a constant pressure within the airship's air bladder. When the airship needs to descend, the host computer sends a corresponding command to the controller in control box 7, opening valve 3 while motor 2 is stopped, releasing the high-pressure gas from the bladder to the outside. The controller in control box 7 can collect ambient temperature information and, under certain conditions, heat the motor and the controller within control box 7. The polyurethane insulation layer 8 and the control box insulation layer ensure the normal operation of the airflow regulation device. This device has a simple structure, is easy to use and maintain, has a wide adjustable speed range, good temperature management and a perfect control design, and can meet the working requirements of airships in different mission scenarios from near the ground to 20km altitude, and has low cost over the whole life cycle.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-power and low-weight high-altitude air volume regulating device for regulating the air volume of a stratospheric airship, comprising a fan (1) and a motor (2), characterized in that, The fan (1) includes an impeller (101), an upper shroud (102), and a lower shroud (103); the impeller (101) adopts a mixed-flow blade type, the blades of the impeller (101) are backward-curved blades, the blade thickness is 1.0-1.2mm, the blade wrap angle is 55-65°, the blade inlet angle is 35-45°, and the blade outlet angle is 55-65°; the upper shroud (102) and the lower shroud (103) are both volute-shaped, the upper shroud (102) is provided with an air inlet (105), the lower shroud (103) is provided with a motor mounting hole, the impeller (101) is located between the upper shroud (102) and the lower shroud (103), the upper shroud (102) and the lower shroud (103) are sealed and fixedly connected, and form an airflow channel; The motor (2) is connected to the impeller (101) through the mounting hole of the lower shroud (103) and is used to drive the fan (1) to rotate; the air outlet (104) of the fan (1) is sealed to the air inlet of the stratospheric airship through the valve (3); the valve (3) adopts a miniature reversible DC drive motor and is equipped with a reed switch constant temperature heater on the outer shell; It also includes a flexible polyimide heating film, which is installed inside the motor housing (6) and the control box (7) to heat the motor (2) and the controller; the motor housing (6) has a double-layer structure, which is filled with polyurethane foaming agent to form a polyurethane heat insulation layer; the control box (7) is provided with pearl cotton heat insulation felt inside; the upper hood (102) and the lower hood (103) are made of magnesium alloy material.

2. The low-power and low-weight high-airflow regulating device according to claim 1, characterized in that, The motor (2) is a DC brushless motor with a working voltage of 24VDC, a rated power of 120W, and an adjustable speed of 16900rpm.

3. The low-power and low-weight high-airflow regulating device as described in claim 1, characterized in that, It also includes a controller that is connected to the motor (2) and valve (3) via signals. The controller is used to receive instructions from the host computer and to regulate the start and stop of the motor (2) and valve (3) according to the instructions. It can also adjust the motor speed.

4. The low-power and low-weight high-airflow regulating device as described in claim 1, characterized in that, The control box (7) is provided with pearl cotton heat insulation felt inside. The pearl cotton heat insulation felt is pasted in multiple layers inside the control box with foam adhesive to achieve heat preservation of the controller.

5. The low-power and low-weight high-airflow regulating device as described in claim 1, characterized in that, The impeller (101) is made of aluminum alloy.

Images