Efficient light-weight fan

Abstract

The utility model 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 flow resistance of airflow in the center area of the impeller is reduced to a certain extent, the airflow can pass through the impeller more smoothly, energy loss is reduced, the performance and efficiency of the fan are improved, the airflow can be gradually gathered when flowing through the fan blade hub and the guide blade hub through mutual combination of the two hemispheres, the air pressure in the fan is increased, and the efficiency of the fan is improved. And the hemispherical hub is located in the middle of the impeller, so that when the airflow flows through the sphere, a specific flowing form can be generated, the possible local vortex and viscous flow areas can be broken, the flow field is more uniform and ordered, and the flowing efficiency in the impeller is improved.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, specifically to a high-efficiency and lightweight fan. Background Technology

[0002] A fan is a general-purpose mechanical device that converts mechanical energy into gas energy and enables the directional transport of gas. It is widely used in various fields such as industry, construction, agriculture, transportation, and energy. Based on their working principle, fans can be classified into positive displacement, turbine, and jet types; according to their application, they can be classified into industrial boiler fans, tunnel fans, and general exhaust fans; and according to the airflow direction, they can be classified into centrifugal fans, axial flow fans, and mixed flow fans. In the industrial field, fans are used for ventilation, dust removal, and cooling.

[0003] Nowadays, most fans are equipped with components such as impellers and motors. The motors are installed in cylindrical housings, but the air inlet surface of the cylindrical housing is flat. Therefore, the airflow will directly impact this flat surface during the flow, forming a certain resistance. This resistance spreads the airflow to the outer periphery, thereby forming wind resistance that affects the airflow at other locations, reducing the airflow efficiency of the fan and increasing the energy loss of the fan. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a high-efficiency and lightweight fan that has the advantages of improving airflow efficiency and increasing airflow volume.

[0005] To achieve the above-mentioned goals of improving airflow efficiency and increasing airflow volume, this utility model provides the following technical solution: it includes a fan body, which includes a support, an impeller, a motor unit and a screen, wherein the impeller and the screen are mounted on the support, and a guide vane assembly is also provided between the impeller and the screen.

[0006] The impeller includes a fan blade hub, at least two blades are fixed on the outer periphery of the fan blade hub, an air inlet ring is fixed on the blades, and the fan blade hub is hemispherical;

[0007] The guide vane assembly also includes a guide vane hub, on which several rear guide vanes are fixedly installed. The guide vane hub is also hemispherical.

[0008] Preferably, both the fan impeller hub and the guide vane hub are hemispherical, wherein the radius of the sphere of the fan impeller hub is smaller than the radius of the sphere of the guide vane hub, and the arc surface of the fan impeller hub and the arc surface of the guide vane hub can also form a complete arc, and the cross-sectional radius of the arc gradually increases along the direction of airflow.

[0009] Preferably, the guide vane assembly is fixedly mounted on the bracket, the guide vane hub is fixedly mounted on the inner wall of the bracket via the rear guide vane, and at least two heat dissipation holes are also provided on one end face of the guide vane hub, and the rear guide vane is curved.

[0010] Preferably, the air inlet ring replaces the air inlet of the fan body, the air inlet ring is arranged with its edge away from the bracket extending outward, the air inlet ring is rotatably connected to the bracket, a number of drip holes are also provided on the outer peripheral side of the fan blade hub, and the surface of the blade is curved.

[0011] Preferably, the blade has several grooves on its curved surface, and a serrated tail is provided on one side edge of the blade.

[0012] Preferably, the air inlet ring is disposed on the outer periphery of the blade, that is, the air inlet ring is fixedly installed on the fan hub by the blade, the unfolded part of the air inlet ring is the air inlet, and the surface of the air inlet is arc-shaped.

[0013] Preferably, the guide vane assembly and impeller are made of plastic, and their surfaces are coated with a protective coating.

[0014] Preferably, the motor unit 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 all three rotate synchronously with the motor rotor housing.

[0015] Preferably, the outer periphery of the bracket is provided with at least two support ribs, the support ribs are located on the side away from the fan blade hub, and an installation groove is provided at the support ribs.

[0016] Preferably, the annular mesh structure of the mesh cover has multiple mounting pins on its outer periphery, which cooperate with mounting grooves. The mesh cover is fixed to the bracket by the cooperation of the mounting pins and mounting grooves.

[0017] Compared with the prior art, this utility model provides a high-efficiency and lightweight fan, which has the following beneficial effects:

[0018] 1. This high-efficiency, lightweight fan, through the design and size of its hemispherical hub, acts like a streamlined object, reducing airflow resistance in the central impeller region to a certain extent. This allows airflow to pass through the impeller more smoothly, reducing energy loss and improving the fan's performance and efficiency. The combination of two hemispheres allows airflow to gradually converge as it flows through the impeller hub and guide vane hub, increasing the internal air pressure and thus the overall airflow pressure. The hemispherical hub, located in the middle of the impeller, creates a specific flow pattern as airflow passes through it, helping to break up potential local eddies and stagnant areas, making the flow field more uniform and orderly, and improving the internal flow efficiency of the impeller.

[0019] 2. This high-efficiency, lightweight fan utilizes a hemispherical design in the guide vane hub to secure the motor. This partial spherical structure better accommodates the motor's minute vibrations and displacements during operation compared to traditional planar mounting methods. The curved surface of the sphere provides relatively uniform support in all directions, effectively reducing the energy transmitted from motor vibration to the support frame and the entire fan structure, lowering the risk of structural resonance, and ensuring motor stability. Furthermore, it cleverly integrates motor fixation, support, and connection to the support frame within a limited space. This design not only saves space for additional mounting brackets and connectors but also simplifies the motor installation process and improves assembly efficiency. During fan maintenance and repair, the motor can be easily disassembled and reinstalled from the spherical structure, reducing maintenance costs and time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the guide vane assembly and support of this utility model;

[0022] Figure 3 This is a schematic diagram of the impeller structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the exploded structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the airflow direction structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the structure where the curved surface of the blade of this utility model intersects with circles of different diameters;

[0026] Figure 7 This is a schematic diagram showing the length and elevation angle of the intersection line between the curved surface of the blade of this utility model and circles of different diameters;

[0027] Figure 8 This is a diagram showing the distribution of biomimetic serrations at the trailing edge of the present invention.

[0028] Figure 9 This is a structural diagram of the hemispherical hub of the present invention.

[0029] In the diagram: 10, bracket; 101, diffuser; 102, support rib; 20, fan impeller hub; 201, blade; 2011, strip groove; 2012, serrated tail; 202, air inlet ring; 203, air inlet; 204, drip hole; 30, guide vane hub; 301, heat dissipation hole; 302, rear guide vane; 40, motor rotor housing; 41, mounting flange; 42, motor; 50, mesh cover. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figure 1-4 As shown, the fan body includes a support frame 10, an impeller, a motor unit, and a screen 50. The impeller and screen 50 are mounted on the support frame 10, and a guide vane assembly is provided between the impeller and the screen 50. At least two support ribs 102 are provided on the outer periphery of the support frame 10, located away from the impeller. Mounting grooves are provided at the support ribs 102. The screen 50 has a ring-shaped mesh structure, and multiple mounting pins are provided on its outer periphery. These mounting pins engage with the mounting grooves, and the screen 50 is fixed to the support frame 10 through the engagement of the mounting pins and the mounting grooves. This assembly process simplifies and speeds up the installation of the screen 50. Users only need to install the screen 50 correctly according to the pre-installed interface and structure, without any additional modification or processing. During fan maintenance and repair, the screen 50 is also easier to disassemble, allowing for quick opening of the screen 50 for inspection, cleaning, and repair of the fan interior, improving maintenance efficiency and reducing downtime.

[0032] The motor unit 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. The motor 42 is an external rotor motor. The mounting flange 41 and the motor rotor housing 40 are used to install the impeller, and all three rotate synchronously with the motor rotor housing 40. Example 1

[0033] The impeller includes a fan hub 20, with at least two blades 201 fixed on the outer periphery of the fan hub 20. An air inlet ring 202 is fixed on the blades 201, which replaces the air inlet of the fan body. The edge of the air inlet ring 202 away from the support 10 is set outward. The air inlet ring 202 is rotatably connected to the support 10. The air inlet is directly set on the impeller, so that it rotates synchronously with the impeller. When the impeller and the air inlet rotate synchronously, the airflow can enter the impeller more directly and quickly, reducing the energy loss of the airflow during transmission, enhancing the fan's ability to draw in airflow, and thus increasing the gas flow rate per unit time.

[0034] A diffuser 101 is provided on the inner wall of the support 10 on the side away from the impeller hub 20. The diffuser 101 is inclined and gradually increases in size away from the impeller, which can achieve the effect of airflow diffusion and greatly improve the pressure recovery of the airflow. That is, through the setting of the diffuser 101, the airflow velocity gradually decreases when flowing out of the support. According to Bernoulli's principle, the diffuser section reduces the airflow velocity and increases the pressure when flowing out of the support, which can significantly improve the overall output pressure of the fan system. Moreover, the diffuser 101 can guide the airflow to decelerate and pressurize smoothly, reducing airflow turbulence and separation. Stable airflow output is conducive to the uniform distribution of airflow in the subsequent pipeline system, reducing pressure fluctuations in the system, and improving the operational stability of the entire ventilation or pneumatic conveying system.

[0035] Therefore, the rapid intake of airflow at the impeller can greatly increase the overall airflow intake of the fan. The airflow can be diffused through the diffuser 101, thereby increasing the air pressure at the outlet. The greater the intake, the higher the air pressure at the outlet. Thus, through the combination of these two and the synergistic effect of other internal structures, the airflow can be efficiently accelerated and directionally guided, greatly increasing the fan's range and efficiency, and enabling long-distance gas transportation.

[0036] The fan blade hub 20 is also provided with several drip holes 204. For outdoor fans, the drip holes 204 on the middle sphere play an important protective role. In rainy or humid environments, rainwater or condensation may accumulate on the surface of the sphere. The presence of the drip holes 204 can drain this water in a timely manner, preventing water from staying on the surface of the sphere for a long time, and thus preventing water from seeping into the motor and causing damage such as short circuits and corrosion.

[0037] The impeller hub 20 can be hemispherical, and several drip holes 204 are provided on the outer periphery of the impeller hub 20. The surface of the blade 201 is curved, and the rotation direction of the blade 201 is clockwise. The curved surface of the impeller is formed by long-term flow field simulation and comprehensive consideration to form a unique curved surface structure, which has the advantages of higher efficiency and lower noise. Figure 6 and Figure 7 As shown, Figure 6 The impeller's rotation axis is used as the center to draw circles with diameters of 180mm, 240mm, 300mm, 360mm, and 420mm, which intersect the curved surface of the blades to produce intersection lines. Figure 7 Let the length and elevation angle of the cross section where the blade surface intersects with circles of different diameters be given. A line segment is drawn from the bottom to the top center of the cross section. A ray is drawn to the right from the left end of the line segment. The angle between the ray and the line segment is 10°-60°, and the length of the line segment is 60-500mm.

[0038] Several strip grooves 2011 are formed on the curved surface of the blade 201. These grooves 2011 are located on the back of the blade and can form a special flow structure on the back, promoting airflow within the boundary layer and delaying boundary layer separation. This reduces eddy and turbulent losses on the back of the blade, improving its aerodynamic performance and enabling the fan to utilize airflow energy more effectively during operation. Furthermore, because the grooves improve airflow and reduce instability and turbulence, they reduce noise caused by airflow impact and vibration, making the fan quieter and improving the comfort of the working environment. While ensuring blade strength and rigidity, the design of the strip grooves 2011 can appropriately reduce the weight of the blade, lower the overall mass of the impeller, and reduce the inertial force during rotation, helping to reduce the motor load and improve the fan's energy efficiency. A serrated tail 2012 is also provided on one side edge of the blade 201. Specifically, the serrated tail 2012 is located at the tail of the blade 201 in the direction of rotation, and its specific structure is as follows... Figure 8 As shown, the three points of the triangular sawtooth are defined as a1, b1, and b2. Circles are drawn passing through these three points with the impeller rotation center as the center. The intersection of the circle passing through b1 and the line b1b2 is at the midpoint of the line b1b2, i.e., B = 1 / 2A. The sawtooth width A ranges from 5-15mm, and the sawtooth depth H ranges from 5-25mm. Both the sawtooth width A and depth H change uniformly, meaning that the width A and depth H gradually decrease from the air inlet 203 to the impeller hub 20. This sawtooth-shaped trailing edge can more effectively disperse the airflow at the trailing edge, reducing eddies and turbulence in the wake, lowering energy loss, and improving fan efficiency. Simultaneously, the sawtooth at the blade trailing edge can alter the distribution and frequency of the wake, reducing aerodynamic interference between adjacent blades, avoiding vibration and noise caused by airflow interaction, and improving the overall aerodynamic performance and operational stability of the impeller.

[0039] The air inlet ring 202 is located on the outer periphery of the blade 201, meaning it is fixedly mounted on the impeller hub 20 via the blade 201. The unfolded part of the air inlet ring 202 is the air inlet 203, which has a curved surface. The air inlet ring 202 guides and organizes the airflow entering the impeller, allowing it to flow more smoothly into the impeller, reducing airflow turbulence and eddy currents, thereby improving the fan's intake efficiency, reducing intake losses, and ultimately enhancing the overall performance of the fan. Since the air inlet ring 202 is fixed to the impeller, it rotates synchronously with the impeller, eliminating any gap between them and significantly reducing the pressure difference. This further reduces eddy currents, leakage, and noise.

[0040] The guide vane assembly is also fixedly mounted on the bracket 10. It includes a guide vane hub 30, with several rear guide vanes 302 fixedly mounted on its outer periphery. The guide vane hub 30 is fixedly mounted on the inner wall of the bracket 10 via 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 design of the guide vane hub 30, the airflow accelerated by the impeller can be guided and rectified a second time. Adjusting the airflow with rotational speed to axial flow effectively reduces swirling losses, improves airflow energy utilization, and significantly enhances the performance and efficiency of the fan. Simultaneously, it reduces noise and vibration caused by airflow rotation and turbulence, making the fan operation smoother and more comfortable. The heat dissipation holes 301 allow outside cold air to be directly introduced around the motor, accelerating air convection on the motor surface and removing heat generated during motor operation.

[0041] The guide vane hub 30 is hemispherical, used to fix the motor. This partial spherical structure better accommodates the motor's minute vibrations and displacements during operation compared to traditional planar fixing methods. The curved surface of the sphere provides relatively uniform support in all directions, effectively reducing the energy transmitted from motor vibration to the support and the entire fan structure, lowering the risk of structural resonance, and ensuring motor stability. Furthermore, it cleverly integrates motor fixing, support, and connection to the support within a limited space. This design not only saves space for additional mounting brackets and connectors but also simplifies the motor installation process and improves assembly efficiency. During fan maintenance and repair, disassembling and reinstalling the motor from the spherical structure is relatively convenient, reducing maintenance costs and time. The rear guide vane 302 is curved, further guiding and rectifying the airflow accelerated by the impeller. It can adjust the airflow with a certain rotational speed at the impeller outlet into axial flow, reducing swirling losses and improving the energy utilization rate of the airflow.

[0042] Both the fan blade hub 20 and the guide vane hub 30 are hemispherical, such as Figure 9 As shown, the diameter of the sphere of the fan impeller hub 20 on the left is D. The right side of the hub cuts through the center of the sphere, removing the right hemisphere. The left side cuts parallel to the right side cuts, and its distance from the center of the sphere is (RL). D ranges from 80 to 250 mm, and L ranges from 30 to 110 mm. The guide vane hub 30 on the right can be used to fix the motor. Its diameter is D1, the distance between the right cut surface and the center of the sphere is S1, and the distance between the left cut surface and the center of the sphere is S2. The hemispherical hub shape and size can act like a streamlined object, reducing the flow resistance of the airflow in the central region of the impeller to a certain extent, allowing the airflow to pass through the impeller more smoothly, reducing energy loss, and improving the performance and efficiency of the fan. The radius of the sphere of the fan impeller hub 20 is smaller than the radius of the sphere of the guide vane hub 30. The radius of the left side cut surface of the guide vane hub 30 is... With the same cross-sectional radius as the right side of the impeller hub 20, the arc surface of the impeller hub 20 and the arc surface of the guide vane hub 30 can also form a complete arc. The cross-sectional radius of the arc gradually increases along the direction of airflow, allowing the airflow to gradually converge, increasing the wind pressure inside the fan, and thus increasing the overall pressure of the airflow. The hemispherical hub is located in the middle of the impeller, so that when the airflow passes through the sphere, a specific flow pattern will be generated, which helps to break up possible local vortices and stagnant areas, making the flow field more uniform and orderly, and improving the flow efficiency inside the impeller.

[0043] Furthermore, since the air inlet is fixedly connected to the impeller, the entire bracket does not contain an air inlet, thus reducing the overall thickness of the bracket, improving space utilization, and allowing it to adapt to more environments during installation.

[0044] The guide vane assembly and impeller are made of plastic, and their surfaces are coated with a protective coating. This coating blocks the corrosion of the plastic material by ultraviolet rays and oxygen, delays aging, maintains the mechanical properties and appearance integrity of the material, and extends its service life. At the same time, it enhances corrosion resistance in harsh environments, ensuring normal operation of the fan and improving its adaptability in complex environments. Furthermore, the coating reduces surface roughness, decreases frictional resistance between the airflow and the impeller and support surfaces, and improves the fan's operating efficiency. Example 2

[0045] The impeller hub 20 can also be truncated cone-shaped, and the guide vane hub 30 is also truncated cone-shaped. The combination of the impeller hub 20 and the guide vane hub 30 can form a complete large truncated cone. The radius of the truncated cone gradually increases from the impeller hub 20 to the guide vane hub 30. When the airflow passes through the truncated cone hub, its fluid area gradually decreases, so the airflow can be gradually concentrated, thereby increasing the smoothness of the airflow. This allows for further guidance and rectification of the airflow after it has been accelerated by the impeller, reducing energy loss and improving the performance and efficiency of the fan.

[0046] Working principle: The motor 42 on the motor unit is installed inside the guide vane hub 30. The impeller is mounted 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 fitted onto the inner wall of the bracket 10. The screen 50 is then installed on the other side of the bracket 10. When the motor is started, the blades 201 rotate, causing airflow. The airflow direction is as follows: Figure 6 As shown, the airflow is drawn into the fan through the rotation of the blade 201. At this time, the airflow is in a rotating state. Then, the rotating airflow is rectified by the rear guide vane 302 and can be changed to a horizontal flow.

[0047] In summary, this high-efficiency, lightweight fan, through the design and size of its hemispherical hub, functions similarly to a streamlined object, reducing airflow resistance in the central impeller region to a certain extent. This allows airflow to pass through the impeller more smoothly, reducing energy loss and improving the fan's performance and efficiency. The combination of two hemispheres allows airflow to gradually converge as it flows through the impeller hub 20 and guide vane hub 30, increasing the internal air pressure and thus the overall airflow pressure. The hemispherical hub, located in the center of the impeller, creates a specific flow pattern as airflow passes through it, helping to break up potential local eddies and stagnant areas, resulting in a more uniform and orderly flow field and improving the internal flow efficiency of the impeller. Furthermore, the hemispherical design of the guide vane hub 30 can be used to fix the motor. Fixing the motor with a partial spherical structure better accommodates the minor vibrations and displacements of the motor during operation compared to traditional planar fixing methods. The curved surface of the sphere provides relatively uniform support in all directions, effectively reducing the energy transmitted from motor vibration to the support frame and the entire fan structure, lowering the risk of structural resonance, and ensuring the stability of motor operation. Furthermore, it cleverly integrates the functions of motor fixation, support, and connection to the support frame within a limited space. This design not only saves space for additional mounting brackets and connectors but also simplifies the motor installation process and improves assembly efficiency. During fan maintenance and repair, the disassembly and reinstallation of the motor from the spherical structure is also relatively convenient, reducing maintenance costs and time.

[0048] 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.

[0049] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency, lightweight fan, comprising a fan body, characterized in that: The main body of the fan includes a support (10), an impeller, and a motor unit, wherein the impeller is mounted on the support (10), and a guide vane assembly is also provided inside the support (10); The impeller includes a fan impeller hub (20), blades (201) and an air inlet ring (202). The blades (201) are fixed on the outer periphery of the fan impeller hub (20), and the air inlet ring (202) is fixed on the blades (201). The fan impeller hub (20) is a hemispherical shape. The guide vane assembly also includes a guide vane hub (30), on which a plurality of rear guide vanes (302) are fixedly installed on the outer periphery. The guide vane hub (30) is also hemispherical.

2. The high-efficiency lightweight fan according to claim 1, characterized in that: Both the fan impeller hub (20) and the guide vane hub (30) are hemispherical. The radius of the sphere of the fan impeller hub (20) is smaller than that of the guide vane hub (30). The arc surface of the fan impeller hub (20) and the arc surface of the guide vane hub (30) can also form a complete arc. The cross-sectional radius of the arc gradually increases along the direction of airflow.

3. The high-efficiency lightweight fan according to claim 1, characterized in that: The guide vane assembly is fixedly installed on the bracket (10), and the guide vane hub (30) is fixedly installed on the inner wall of the bracket (10) through the rear guide vane (302). At least two heat dissipation holes (301) are also provided on one side end face of the guide vane hub (30), and the rear guide vane (302) is curved.

4. The high-efficiency lightweight fan according to claim 1, characterized in that: 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 set outward on the side edge away from the bracket (10). The air inlet ring (202) is rotatably connected to the bracket (10). Several drip holes (204) are also provided on the outer peripheral side of the fan blade hub (20). The surface of the blade (201) is curved.

5. The high-efficiency lightweight fan according to claim 4, characterized in that: The air inlet ring (202) is disposed on the outer periphery of the blade (201), that is, the air inlet ring (202) is fixedly installed on the fan 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 set as an arc surface.

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

7. The high-efficiency lightweight fan according to claim 1, characterized in that: The motor unit 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. 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).

8. The high-efficiency lightweight fan according to claim 1, characterized in that: At least two support ribs (102) are provided on the outer periphery of the bracket (10). The support ribs (102) are located on the side away from the fan blade hub (20), and an installation groove is provided at the support ribs (102).

9. A high-efficiency lightweight fan according to claim 8, characterized in that: The bracket (10) is also equipped with a mesh cover (50). The mesh cover (50) has an annular mesh structure and multiple mounting pins are provided on its outer periphery. The mounting pins cooperate with the mounting grooves. The mesh cover (50) is fixed on the bracket (10) by the cooperation of the mounting pins and the mounting grooves.

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