Efficient light-weight fan

Abstract

The invention relates to the technical field of fans, and discloses an efficient light-weight fan which comprises a fan body, the fan body comprises a support, an impeller, a motor set and a mesh enclosure, and the impeller and the mesh enclosure are installed on the support. The air flow suction amount of the whole fan is greatly increased, the air flow can be diffused through the diffusion part, so that the air pressure at the air outlet is increased, the larger the suction amount is, the higher the air pressure at the air outlet is, then the air flow with the rotating speed is adjusted to be axial flow through the guide vane assembly, the rotational flow loss is effectively reduced, and the air flow energy utilization rate is increased. And the performance and efficiency of the fan are remarkably improved, so that the airflow can be efficiently accelerated and directionally guided through the synergistic effect of the internal structure of the fan, the range of the fan is greatly increased, the efficiency of the fan is greatly improved, and long-distance gas conveying and large-flow transmission are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and specifically to an efficient and lightweight fan. Background Art

[0002] A fan is a general mechanical device that converts mechanical energy into gas energy and realizes the directional transportation of gas, and is widely used in multiple fields such as industry, construction, agriculture, transportation, and energy. According to the working principle, fans can be divided into positive displacement, turbine, and jet types; according to their uses, they can be divided into fans for industrial boilers, fans for tunnels, general exhaust fans, etc.; according to the air flow direction, they can be divided into centrifugal fans, axial fans, mixed-flow fans, etc. In the industrial field, fans are used for ventilation, dust removal, and cooling.

[0003] Limited by the structure and performance, the range of traditional fans is relatively short. In scenarios where long-distance gas transportation is required, multiple fans often need to relay to meet the demand, and some practical applications with strict requirements for the range may not even be satisfied. Moreover, there are certain energy losses during the transmission of current fans, which reduces the air flow rate, and the air flow will also generate a certain amount of turbulence due to rotation, resulting in swirl loss and reducing the air output of the fan. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides an efficient and lightweight fan, which has the advantages of high air outlet efficiency and long range.

[0005] To achieve the above purposes of high air outlet efficiency and long range, the present invention provides the following technical solutions: It includes a fan main body, which is characterized in that: the fan main body includes a bracket, an impeller, and a motor group, wherein the impeller is installed on the bracket, and a guide vane assembly is also arranged inside the bracket; The impeller includes a fan blade hub, blades, and an air inlet ring. The blades are fixed on the outer peripheral side of the fan blade hub. The air inlet ring replaces the air inlet of the fan main body and is fixedly connected to the edge of the blades. The edge of the air inlet ring away from the bracket expands outward, and the air inlet ring is rotatably connected to the bracket relatively; On the inner wall of the bracket away from the fan blade hub, a diffuser part is arranged.

[0006] Preferably, the guide vane assembly is also fixedly installed on the bracket, and it includes a guide vane hub. A number of rear guide vanes are fixedly installed on the outer peripheral side of the guide vane hub. The guide vane hub is fixedly installed on the inner wall of the bracket through the rear guide vanes, and the rear guide vanes are bent.

[0007] Preferably, a number of water dripping holes are also arranged on the outer peripheral side of the fan blade hub, and the surface of the blades is curved.

[0008] Preferably, the air inlet ring is disposed on the outer peripheral side of the blade, that is, the air inlet ring is fixedly installed on the fan hub through the blade. The unfolded part of the air inlet ring is the air inlet, and the surface of the air inlet is arranged as an arc surface.

[0009] Preferably, the materials of the guide vane assembly and the impeller are plastic, and a protective coating is sprayed on their surfaces.

[0010] Preferably, the motor set includes a motor rotor housing, a mounting flange and a motor. The motor is detachably installed in the guide vane assembly. The mounting flange and the motor rotor housing are used to install the impeller, and the three rotate synchronously with the motor rotor housing.

[0011] Preferably, at least two support ribs are further disposed on the outer peripheral side of the bracket. The support ribs are disposed on the side away from the fan hub, and mounting grooves are formed at the support ribs.

[0012] Preferably, a net cover is further installed in the bracket. The net cover has an annular mesh structure, and a plurality of mounting pins are disposed on its outer peripheral side. The mounting pins are matched with the mounting grooves, and the net cover is fixed on the bracket through the cooperation of the mounting pins and the mounting grooves.

[0013] A testing method for an efficient and lightweight fan includes fan distance measurement, and the steps are as follows: S1: Fix the fan through a tripod to keep the air flow of the fan horizontal. S2: Place a number of wind speed sensing devices in front of the fan, and the devices are circumferentially placed with the fan as the center. S3: The distances from the placement positions of the wind speed sensing devices to the fan are 5m, 10m, 15m, 20m, 30m, 35m, 40m, 45m, 50m. S4: Start the fan and run it at the maximum power for 5 - 10 minutes, and record the wind speed data of the wind speed sensing devices at each position.

[0014] Fan noise measurement, and the steps are as follows: S1: Fix the fan at the center in a closed laboratory. S2: Place a number of microphones in a spherical range with a radius of 1m centered on the fan, and the microphones are connected to a sound sensor. S3: Turn off the fan, keep the interior of the laboratory airtight, and measure the noise at this time. S4: Start the fan, keep the interior of the laboratory airtight, and measure the noise at this time.

[0015] Preferably, the fan measurement is divided into multiple measurements. The wind speed of the airflow generated by the fan body at 20 m is greater than 40 m / s, while the wind speed at 40 m is 0.5 m / s, which is within the effective range. That is, the fan range is 20 - 40 m, and the generated noise is 65 - 67 dB.

[0016] Compared with the prior art, the present invention provides an efficient and lightweight fan, which has the following beneficial effects: 1. In this efficient and lightweight fan, through the synchronous rotation fixed between the air inlet ring and the impeller, the airflow at the impeller can be quickly inhaled, greatly increasing the airflow intake of the entire fan. The airflow can be diffused through the diffuser part, thereby increasing the air pressure at the air outlet. The overall efficiency and static pressure efficiency are higher, and the ability to overcome resistance (static pressure) and do work at the outlet is stronger. Then, the airflow with a rotational speed is adjusted to axial flow by the guide vane assembly in the opposite direction of the impeller rotation, effectively reducing the swirl loss and improving the airflow energy utilization rate, significantly enhancing the performance and efficiency of the fan. Therefore, through the synergistic effect of the internal structure of the fan, the airflow can be efficiently accelerated and directionally guided, greatly increasing the fan range and the efficiency of the fan, achieving long-distance gas transportation and large-flow transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic diagram of the present invention; Figure 2 It is a half-sectional structure schematic diagram of the present invention; Figure 3 It is a structure schematic diagram of the impeller of the present invention; Figure 4 It is a structure schematic diagram of the guide vane assembly and the bracket of the present invention; Figure 5 It is a structure schematic diagram of the airflow direction of the present invention; Figure 6 It is a structure schematic diagram of the intersection of the blade surface of the present invention and circles with different diameters; Figure 7 It is a structure schematic diagram of the length and elevation angle of the intersection line of the blade surface of the present invention and circles with different diameters; Figure 8 It is a distribution diagram of bionic serrations at the trailing edge of the present invention; Figure 9 It is a structure diagram of the hemispherical hub of the present invention; Figure 10 It is the fan performance test data of the present invention; Figure 11 It is a comparison diagram of the fan noise performance of the present invention.

[0018] In the figure: 10, support; 101, diffuser section; 102, support rib; 20, fan blade hub; 201, blade; 2011, strip-shaped groove; 2012, serrated tail; 202, air inlet ring; 203, air inlet; 204, water drip hole; 30, guide vane hub; 301, heat dissipation hole; 302, rear guide vane; 40, motor rotor housing; 41, mounting flange; 42, motor; 50, wire mesh cover. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figures 1-4 shown, it includes a fan main body, and the fan main body includes a support 10, an impeller, a motor group, and a wire mesh cover 50. Among them, the impeller and the wire mesh cover 50 are installed on the support 10. A guide vane assembly is also provided between the impeller and the wire mesh cover 50. At least two support ribs 102 are provided on the outer peripheral side of the support 10. The support ribs 102 are arranged on the side far from the impeller. An installation groove is provided at the support ribs 102. The wire mesh cover 50 has an annular mesh structure, and a plurality of installation pins are provided on its outer peripheral side. The installation pins are matched with the installation groove. The wire mesh cover 50 is fixed on the support 10 through the cooperation of the installation pins and the installation groove. Through the cooperation of the installation pins and the installation groove, the installation process of the wire mesh cover 50 is more convenient and fast. The user only needs to correctly install the wire mesh cover 50 according to the reserved installation interfaces and structures without additional modification or processing. During the maintenance and repair of the fan, the disassembly of the wire mesh cover 50 is also more convenient. The wire mesh cover 50 can be quickly opened to check, clean, and repair the inside of the fan, improving the efficiency of the maintenance work and reducing the downtime.

[0021] The motor group includes a motor rotor housing 40, a mounting flange 41, and a motor 42. The motor 42 is detachably installed in the guide vane assembly. Among them, the motor 42 is an outer rotor motor. The mounting flange 41 and the motor rotor housing 40 are used to install the impeller, and the three rotate synchronously with the motor rotor housing 40. Embodiment 1

[0022] The impeller includes a fan blade hub 20. At least two blades 201 are fixed to the outer peripheral side of the fan blade hub 20. An air inlet ring 202 is fixed to the blades 201. The air inlet ring 202 replaces the air inlet of the fan main body. The edge of the air inlet ring 202 away from the bracket 10 expands outward. The air inlet ring 202 is rotatably connected to the bracket 10. The air inlet is directly provided on the impeller and rotates synchronously with the impeller. When the impeller and the air inlet rotate synchronously, the air flow can enter the impeller more directly and quickly, reducing the energy loss during the transmission of the air flow, enhancing the air suction capacity of the fan, and thus increasing the gas flow rate per unit time.

[0023] On the inner wall of the bracket 10 away from the fan blade hub 20, a diffuser portion 101 is provided. The diffuser portion 101 is provided as an inclined surface and gradually increases in the direction away from the impeller, which can achieve the effect of diffusing the air flow and greatly improve the pressure recovery of the air flow. That is, through the setting of the diffuser portion 101, when the air flow flows out of the bracket, the flow velocity gradually decreases. According to Bernoulli's principle, the diffuser section reduces the flow velocity of the air flow flowing out of the bracket and increases the pressure, which can significantly improve the overall output pressure of the fan system. Moreover, the diffuser portion 101 can guide the air flow to decelerate and increase the pressure smoothly, reducing the turbulence and separation phenomena of the air flow. The stable air flow output is conducive to the uniform distribution of the air flow in the subsequent pipeline system, reducing the pressure fluctuation in the system, and improving the operation stability of the entire ventilation or pneumatic conveying system.

[0024] Therefore, through the rapid suction of the air flow at the impeller, the air flow suction volume of the entire fan can be greatly increased. The air flow can be diffused through the diffuser portion 101, thereby increasing the air pressure at the air outlet. The larger the suction volume, the higher the air pressure at the outlet. Therefore, through the cooperation of the two and the synergistic effect of other internal structures, the air flow can be efficiently accelerated and directionally guided, greatly increasing the range and efficiency of the fan, and realizing long-distance gas transmission. Most of the current fan ranges are between 10 - 40m, and the generated noise is mostly between 68 - 70dB. However, through the cooperation of the impeller, the diffuser portion 101 and other components, the air flow range generated by the fan main body can reach 20 - 50m, greatly increasing the overall range of the fan. As Figure 10 shown, the red line is the fan of the present application, and the black line is the comparison fan. The fan efficiency of the fan of the present application is significantly improved at 0 - 2400CMH until it reaches 4800CMH, and the fan air pressure drops to 0. Moreover, the noise range generated by the fan of the present application is 65 - 67dB, with an average of 65.8dB, further reducing the overall noise of the fan. As Figure 11 shown, the left side is the fan of the present application, and the right side is the comparison fan.

[0025] The measurement of the fan distance is as follows: S1: Fix the fan through a tripod to keep the air flow of the fan horizontal; S2: Place a number of wind speed sensing devices in front of the fan, with the devices placed circumferentially around the fan as the center; S3: The distances of the wind speed sensing devices from the fan are 5m, 10m, 15m, 20m, 30m, 35m, 40m, 45m, and 50m; S4: Start the fan and run it at maximum power for 5 - 10 minutes, and record the wind speed data of the wind speed sensing devices at each position.

[0026] Measurement of the fan noise is as follows: S1: Fix the fan firmly at the center in the closed laboratory; S2: Place a number of microphones within a spherical range with a radius of 1m centered on the fan, and the microphones are connected to the sound sensors; S3: Turn off the fan, keep the interior of the laboratory airtight, and measure the noise at this time; S4: Start the fan, keep the interior of the laboratory airtight, and measure the noise at this time.

[0027] A number of water - dripping holes 204 are also opened on the fan blade hub 20. For fans used outdoors, the water - dripping holes 204 on the middle sphere play an important protective role. In rainy days or humid environments, rainwater or condensed water may accumulate on the sphere surface. The existence of the water - dripping holes 204 can timely drain this accumulated water, prevent the water from staying on the sphere surface for a long time, and further prevent the water from seeping into the motor interior, causing damage such as short - circuit and corrosion to the motor.

[0028] A number of water - dripping holes 204 are also provided on the outer peripheral side of the fan blade hub 20. The surface of the blade 201 is set as a curved surface, and the rotation direction of the blade 201 is clockwise. Among them, the curved surface of the impeller is formed through long - term flow field simulation and comprehensive consideration, with the advantages of higher efficiency and lower noise, as Figure 6 and Figure 7 shown, Figure 6 In [reference], circles with diameters of 180mm, 240mm, 300mm, 360mm, and 420mm are made with the rotation axis of the impeller as the center, and they intersect with the blade curved surface respectively, generating intersection lines. Figure 7 Let [parameters] be the length and elevation angle of the intersection cross - section of the blade curved surface and circles with different diameters. Among them, a line segment is made from the bottom to the center of the top of the cross - section, and a ray is made to the right with the left - hand point of the line segment as the endpoint. The included angle between the ray and the line segment is 10° - 60°, and the length of the line segment is 60 - 500mm.

[0029] On the curved surface of the blade 201, a number of strip-shaped grooves 2011 are provided. The strip-shaped grooves 2011 are arranged on the back of the blade, which can form a special flow structure on the back of the blade, promote the air flow in the boundary layer, delay the separation of the boundary layer, thereby reducing the eddy current and turbulent flow losses of the air flow on the back of the blade, improving the aerodynamic performance of the blade, enabling the fan to more effectively utilize the air flow energy during operation, and because the grooves can improve the air flow state and reduce the instability and disorder of the air flow, the noise generated by air flow impact and vibration can be reduced, making the fan operation quieter and improving the comfort of the working environment. On the premise of ensuring the strength and stiffness of the blade, the design of the strip-shaped grooves 2011 can appropriately reduce the weight of the blade, reduce the overall mass of the impeller, reduce the inertial force during rotation, help reduce the load on the motor, and improve the energy utilization efficiency of the fan. At one side edge of the blade 201, a serrated tail 2012 is also provided. Specifically, the serrated tail 2012 is located at the tail in the rotation direction of the blade 201, and its specific structure is as Figure 8 shown. Define the three points of the triangular serration as points a1, b1, and b2. With the rotation center of the impeller as the center of the circle, draw circles through the three points respectively. The intersection of the circle passing through b1 and the line b1b2 is at the midpoint of the line b1b2, that is, B = 1 / 2A. And the range of the serration width A is 5 - 15 mm, and the range of the serration depth H is 5 - 25 mm, and the serration width A and the depth H change uniformly, that is, the sizes of the serration width A and the depth H gradually decrease from the air inlet 203 to the fan blade hub 20. Such a serrated trailing edge can more effectively disperse the air flow at the trailing edge, reduce the eddy current and turbulent flow in the wake, reduce the energy loss of the air flow, improve the efficiency of the fan, and at the same time, the serrations at the trailing edge of the blade can change the distribution and frequency of the wake, reduce the aerodynamic interference between adjacent blades, avoid vibration and noise generated by the interaction of air flows, and improve the overall aerodynamic performance and operation stability of the impeller.

[0030] The air inlet ring 202 is arranged on the outer peripheral side of the blade 201, that is, the air inlet ring 202 is fixedly installed on the fan blade hub 20 through the blade 201. The unfolded part of the air inlet ring 202 is the air inlet 203, and the surface of the air inlet 203 is arranged as an arc surface. Through the setting of the air inlet ring 202, the air flow entering the impeller can be preliminarily guided and sorted, so that the air flow flows into the impeller more smoothly, reducing the generation of air flow disorder and eddy current, thereby improving the air intake efficiency of the fan, reducing the air intake loss, and further improving the overall performance of the fan. Since the air inlet ring 202 and the impeller are fixed together, when the impeller rotates, the air inlet ring 202 rotates synchronously, so there is no gap between the air inlet ring 202 and the impeller, so the pressure difference is greatly reduced, thereby reducing the generation of eddy current and problems such as leakage and noise.

[0031] The guide vane assembly is also fixedly installed on the bracket 10. It includes a guide vane hub 30. A number of rear guide vanes 302 are fixedly installed on the outer peripheral side of the guide vane hub 30. The guide vane hub 30 is fixedly installed on the inner wall of the bracket 10 through the rear guide vanes 302. At least two heat dissipation holes 301 are also provided on one end face of the guide vane hub 30. Through the setting of the guide vane hub 30, the airflow accelerated by the impeller can be secondarily guided and rectified. The airflow with a rotational speed is adjusted to axial flow, effectively reducing the swirl loss, improving the utilization rate of the airflow energy, and significantly enhancing the performance and efficiency of the fan. At the same time, it can reduce the noise and vibration caused by the rotation and turbulence of the airflow, making the fan operate more smoothly and comfortably. Through the setting of the heat dissipation holes 301, the cold air from the outside can be directly introduced around the motor, accelerating the air convection on the surface of the motor and taking away the heat generated during the operation of the motor.

[0032] Moreover, since the air inlet is fixedly connected to the impeller, the entire bracket does not include the air inlet, so the overall thickness of the bracket is reduced, improving the space utilization rate. During its installation, it can adapt to more environments.

[0033] The materials of the guide vane assembly and the impeller are plastics, and a protective coating is sprayed on their surfaces. The coating can block the erosion of ultraviolet rays, oxygen, etc. on the plastic material, delay aging, maintain the mechanical properties and appearance integrity of the material, and extend the service life. At the same time, it enhances the corrosion resistance in harsh environments, ensures the normal operation of the fan, and improves the adaptability in complex environments. In addition, the coating can reduce the surface roughness, reduce the frictional resistance between the airflow and the surfaces of the impeller and the bracket, and improve the operating efficiency of the fan. Embodiment 2

[0034] A groove is provided on one side of the air inlet ring 202 close to the fan blade hub 20. The blade 201 is located in the groove and is slidably connected thereto, that is, the blade 201 and the air inlet ring 202 can rotate relative to each other. There is a certain resistance between the blade 201 and the groove. When the blade 201 rotates, the air inlet ring 202 can be driven to rotate through the resistance, so that it rotates synchronously with the impeller. When the impeller and the air inlet rotate synchronously, the airflow can quickly enter the impeller, reducing the energy loss during the transmission of the airflow, enhancing the air suction ability of the fan, and thus increasing the gas flow rate per unit time. At the same time, since the air inlet ring is located outside, if foreign objects enter the gap between the air inlet ring and the bracket 10, the air inlet ring will be stuck at this time, while the blade can continue to rotate, avoiding the blade being stuck and causing the motor to burn out.

[0035] The part of the diffuser 101 close to the fan blade hub 20 can also be set as an arc surface, so that the airflow shows an exponential growth when passing through the diffuser 101, further increasing the air pressure at its outlet, thereby increasing its range and efficiency.

[0036] Working principle: The motor 42 on the motor set is installed inside the guide vane hub 30. The impeller is installed on the motor shaft of the motor 42 through the motor rotor housing 40 and the mounting flange 41. Then, the air inlet ring 202 on the impeller is sleeved on the inner wall of the bracket 10. Then, the mesh cover 50 is installed on the other side of the bracket 10. When the motor is started, the rotation of the blades 201 can make the air flow. The air flow direction is as Figure 5 shown. The air flow is inhaled into the fan through the rotation of the blades 201. At this time, the air flow is in a rotating state. Then, through the rectification of the rear guide vane 302, the rotating air flow can be changed to a horizontal flow.

[0037] In summary, for this high-efficiency and lightweight fan, through the rapid inhalation of the air flow at the impeller, the air flow inhalation volume of the entire fan can be greatly increased. The air flow can be diffused through the diffuser part 101, thereby increasing the air pressure at the air outlet. The larger the inhalation volume, the higher the air pressure at the outlet. Then, the guide vane assembly adjusts the air flow with a rotational speed into an axial flow, effectively reducing the swirl loss and improving the air flow energy utilization rate, significantly enhancing the performance and efficiency of the fan. Therefore, through the synergistic effect of the internal structure of the fan, the air flow can be efficiently accelerated and directionally guided, greatly increasing the range and efficiency of the fan and realizing the long-distance gas transportation.

[0038] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency and lightweight fan, comprising a fan body, characterized in that: The fan body comprises a bracket (10), an impeller, and a motor group, wherein the impeller is mounted on the bracket (10), and a guide vane assembly is also arranged in the bracket (10); The impeller comprises a fan wheel hub (20), blades (201) and an air inlet ring (202); the blades (201) are fixed to the outer peripheral side of the fan wheel hub (20); the air inlet ring (202) replaces the air inlet of the fan body and is fixedly connected to the edge of the blade (201); the air inlet ring (202) is arranged to spread outward away from the edge of one side of the bracket (10); and the air inlet ring (202) is connected to the bracket (10) for relative rotation; A diffuser portion (101) is provided on the inner wall of a side of the bracket (10) away from the impeller hub (20).

2. The high-efficiency and lightweight fan according to claim 1, characterized in that: The guide vane assembly is also fixedly mounted on the bracket (10), and comprises a guide vane hub (30), a plurality of rear guide vanes (302) being fixedly mounted on the outer peripheral side of the guide vane hub (30), the guide vane hub (30) being fixedly mounted on the inner wall of the bracket (10) via the rear guide vanes (302), and the rear guide vanes (302) are arranged in a curved manner.

3. The high-efficiency and lightweight fan according to claim 1, characterized in that: A plurality of water drip holes (204) are also provided on the outer peripheral side of the fan blade hub (20), and the surface of the blade (201) is a curved surface.

4. The high-efficiency and lightweight fan according to claim 3, characterized in that: The air inlet ring (202) is arranged on the outer peripheral side of the blade (201), that is, the air inlet ring (202) is fixedly mounted on the fan wheel hub (20) through the blade (201), the unfolded part of the air inlet ring (202) is the air inlet (203), and the surface of the air inlet (203) is an arc surface.

5. The high-efficiency and lightweight fan according to claim 1, characterized in that: The guide vane assembly and the impeller are made of plastic, and the surfaces thereof are sprayed with a protective coating.

6. The high-efficiency and lightweight fan according to claim 1, characterized in that: The motor group comprises a motor rotor shell (40), a mounting flange (41) and a motor (42); the motor (42) is detachably mounted in the guide vane assembly; the mounting flange (41) and the motor rotor shell (40) are used to mount the impeller, and the three rotate synchronously with the motor rotor shell (40).

7. The high-efficiency and lightweight fan according to claim 1, characterized in that: At least two support ribs (102) are also provided on the outer peripheral side of the bracket (10), the support ribs (102) are provided on a side away from the impeller hub (20), and mounting grooves are provided on the support ribs (102).

8. The high-efficiency and lightweight fan according to claim 7, characterized in that: A mesh cover (50) is also installed in the bracket (10). The mesh cover (50) is an annular mesh structure, and a plurality of mounting pins are arranged on its outer peripheral side. The mounting pins cooperate with the mounting grooves. The mesh cover (50) is fixed to the bracket (10) through the cooperation of the mounting pins and the mounting grooves.

9. A method for testing a high-efficiency lightweight wind turbine according to any one of claims 1 to 9, comprising measuring the wind turbine distance, the steps being as follows: S1: Fix the fan with a tripod to keep the airflow of the fan horizontal; S2: Place several wind speed sensing devices in front of the fan, with the devices placed circumferentially around the fan; S3: The wind speed sensing equipment is placed at a distance of 5m, 10m, 15m, 20m, 30m, 35m, 40m, 45m, or 50m from the wind turbine; S4: Start the fan and run it at maximum power for 5-10 minutes, and record the wind speed data of the wind speed sensing device at each location; The fan noise measurement steps are as follows: S1: Fix the fan in the center of the closed laboratory; S2: Several microphones are placed in a spherical area with a radius of 1m with the fan as the center, and the microphones are connected to the sound sensor; S3: The fan is turned off, the laboratory is kept airtight, and the noise is measured at this time; S4: Start the fan, keep the laboratory airtight, and measure the noise at this time.

10. The method for testing a high-efficiency and lightweight fan according to claim 9, characterized in that: The fan measurement is divided into multiple measurements. The airflow generated by the fan body has a wind speed greater than 40m / s at 20m, and a wind speed of 0.5m / s at 40m, which is within the effective range, that is, the fan range is 20-40m, and the noise generated is 65-67dB.

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