High-wind-speed low-wind-noise arc-shaped fan blade

Abstract

The utility model discloses a kind of high wind speed low wind noise arc fan fan blade, it includes hub and the blade of several pieces along the circumferential uniform arrangement of hub;The first end of blade is inclinedly connected to hub, the inside edge and outside edge of blade gradually extend outward, and the spacing between inside edge and outside edge gradually increases with blade outward extension, and the end of outside edge is bent and meets at inside edge, to form hawk mouth angle;The end of blade has first bend angle position and second bend angle position, first bend angle position is located inside edge, second bend angle position is located outside edge, and the cutting angle of first bend angle position is greater than the cutting angle of second bend angle position.It has the advantages of simple structure, compact fit, reasonable design etc.;Therefore, it is a kind of product with superior performance in technicality and economy.

Description

[Technical Field] This utility model mainly relates to a high-speed, low-noise arc-shaped fan blade. [Background Technology] As a widely used device for ventilation, heat dissipation, and cooling, the core performance indicators of a fan mainly include airflow, wind speed, energy efficiency, and operating noise. Among these, the fan blades, as the power-generating components of a fan, directly determine its overall performance through their structural design. Currently, there are many shapes of fan blades on the market, employing different numbers of blades, tilt angles, curvatures, and edge shapes. However, different designs result in significant differences in performance, and even slight structural differences between fan blades can lead to drastically different airflow, wind speed, and noise levels.

[0001] In existing technologies, fan blade design generally faces an irreconcilable contradiction: to achieve high airflow and high speed, it is usually necessary to increase the blade area or increase the rotation speed. However, this intensifies the interaction between the blades and the air, leading to more severe airflow separation, turbulence, and vortex phenomena, resulting in unpleasant operating noise. Conversely, if noise reduction is the primary goal, using smaller blades or reducing the rotation speed often fails to guarantee sufficient airflow and speed, resulting in low air delivery efficiency. Specifically, traditional fan blades typically employ a design with 3 to 5 blades. At high speeds, this design requires a large volume of air to be propelled by each blade, similar to "cutting through the air with a knife," easily triggering violent, pulsed airflow disturbances. This concentrated energy release is the main source of high-frequency wind noise and vortex noise. Although increasing the number of blades is considered a way to improve wind pressure and airflow uniformity, simply increasing the number of blades without corresponding aerodynamic optimization can not only increase noise due to airflow interference between adjacent blades but also lead to decreased energy efficiency due to increased load.

[0002] Furthermore, the shape of the blade's leading edge is crucial to the airflow pattern. Traditional blunt or rounded leading edges tend to cause premature airflow separation upon entry, creating a large drag zone and vortex zone. This not only increases air resistance but also becomes a significant source of noise. Simultaneously, the structure of the blade tip, especially the curvature of the tip and inner side, has a significant impact on controlling vortex shedding and ensuring smooth airflow output. Improper design can further exacerbate energy loss and noise generation.

[0003] In view of this, we have improved the wind turbine blade structure and proposed a new wind turbine blade structure. [Utility Model Content] To solve at least one of the above problems, this utility model proposes a new structural solution. The high-speed, low-noise arc-shaped fan blade adopts the following technical solution: A high-speed, low-noise arc-shaped fan blade, comprising a hub and several blades evenly arranged around the circumference of the hub; The tip of the blade is inclined and connected to the hub. The inner and outer sides of the blade gradually extend outward, and the distance between the inner and outer sides gradually increases as the blade extends outward. The end of the outer side bends and meets the inner side to form an eagle beak. The blade tip has a first bend and a second bend, the first bend is located on the inner side and the second bend is located on the outer side, and the chamfer of the first bend is greater than the chamfer of the second bend.

[0004] Preferably, the number of blades is 9, and the 9 fan blades are evenly spaced at equal angles.

[0005] Preferably, the outer side of the hub is provided with a recess and a blind hole, and the depth of the blind hole is greater than the depth of the recess.

[0006] Preferably, the blind hole is provided with a plug post, and the plug post has a plug hole.

[0007] Preferably, the diameter of the plug post is smaller than the diameter of the blind hole, and a reinforcing rib is provided inside the blind hole, with the two ends of the reinforcing rib connected to the plug post and the wall of the blind hole, respectively.

[0008] Preferably, the inner side of the wheel hub is hollowed out to form a cavity, and the cavity ring is provided with reinforcing ribs.

[0009] The beneficial effects of this utility model compared with the prior art are: This patented design employs a nine-blade arrangement with equal angular spacing, significantly reducing the area of ​​a single blade while maintaining the total swept area. Combined with the unique eagle-beak-like sharp shape of the blade leading edge, it effectively optimizes airflow patterns, reduces airflow separation and turbulent vortices, and achieves high-frequency, low-amplitude air cutting, thereby significantly reducing operating noise and air resistance. Simultaneously, this structure enhances the blades' airflow cutting ability and improves airflow continuity, significantly increasing wind pressure, airflow efficiency, and uniformity, achieving efficient and gentle air delivery. The hub section, through the coordinated design of recesses, blind holes, and reinforcing ribs, achieves lightweighting while ensuring structural strength and motor connection stability. Overall, it combines the advantages of low wind noise, high wind speed, and high structural reliability. It boasts advantages such as simple structure, compact fit, and rational design; therefore, it is a product with superior performance in both technology and economy. [Attached Image Description] Figure 1 A first-view schematic diagram of the high-speed, low-noise arc-shaped fan blades in a preferred embodiment of this utility model; Figure 2 A second-view schematic diagram of the high-speed, low-noise arc-shaped fan blades in a preferred embodiment of this utility model; Figure 3 This is a third-view schematic diagram of the high-speed, low-noise arc-shaped fan blades in a preferred embodiment of the present invention.

Detailed Implementation Methods

[0010] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0011] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0012] The preferred embodiment provided by this utility model is as follows: Figures 1-3 As shown, a high-speed, low-noise arc-shaped fan blade includes a hub 1 and several blades 2 evenly arranged along the circumference of the hub; the number of blades 2 is 9, and the 9 blades are evenly spaced at equal angles. This structure arranges the 9 blades at equal angles, reducing the area of ​​a single blade 2 and lowering the operating noise of the fan blade. The sharp shape of the leading edge of the blade 2 with an eagle-beak tip optimizes the airflow pattern at the leading edge of the blade 2, reduces airflow separation and turbulent vortices, reduces air resistance and vortex noise, and at the same time enhances the "cutting" ability of the blade 2 on the airflow, improves wind pressure and air output efficiency, optimizes airflow continuity, improves air output uniformity and overall air volume, and achieves the effect of "softer and more efficient air delivery".

[0013] The tip of blade 2 is inclinedly connected to hub 1. The inner side 3 and outer side 4 of blade 2 gradually extend outward, and the distance between the inner side 3 and outer side 4 gradually increases as blade 2 extends outward. The end of outer side 4 bends and converges with inner side 3 to form an eagle beak angle 5. The end of blade 2 has a first bend angle position 6 and a second bend angle position 7. The first bend angle position 6 is located on inner side 3, and the second bend angle position 7 is located on outer side 4. The chamfer angle A of the first bend angle position 6 is greater than the chamfer angle B of the second bend angle position 7. When the number of blades 2 increases from the traditional 3-5 blades to 9 blades, the area of ​​a single blade decreases proportionally (the total area remains unchanged), which significantly reduces the volume of air cut by each blade 2 during rotation. When traditional large blades rotate at high speeds, a single blade needs to push a large amount of air, which can easily cause violent airflow separation and turbulent vortices, forming a pulse-like noise similar to "cutting the air with a knife". However, the nine small blades disperse the originally concentrated airflow disturbance into finer airflow units through high-frequency, small-amplitude air cutting, which significantly reduces the intensity of turbulence. The airflow first comes into contact with the sharp wedge-shaped part of the beak tip, and the leading edge of the tip cuts the air more effectively, reducing blade vibration and reducing high-frequency wind noise.

[0014] The outer side of the hub 1 is provided with a recess 11 and a blind hole 12, the depth of which is greater than that of the recess 11. A plug-in post 13 is provided inside the blind hole 12, and the plug-in post 13 has a plug hole 14 for connection to the motor shaft. The diameter of the plug-in post 13 is smaller than the diameter of the blind hole 12. A reinforcing rib 15 is provided inside the blind hole 12, with its two ends connected to the plug-in post 13 and the wall of the blind hole 12, respectively. The inner side of the hub 1 is hollowed out to form a cavity 16, and the cavity 16 is surrounded by the reinforcing rib 15. Through the arrangement of the blind hole 12, cavity 16, plug-in post 13, and reinforcing rib 15, the connection can be maintained, reducing the weight of the hub while ensuring overall stability.

[0015] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0016] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. A high-speed, low-noise arc-shaped fan blade, characterized in that: It includes a hub and several blades evenly arranged around the circumference of the hub; The tip of the blade is inclined and connected to the hub. The inner and outer sides of the blade gradually extend outward, and the distance between the inner and outer sides gradually increases as the blade extends outward. The end of the outer side bends and meets the inner side to form an eagle beak. The blade tip has a first bend and a second bend, the first bend is located on the inner side and the second bend is located on the outer side, and the chamfer of the first bend is greater than the chamfer of the second bend.

2. The high-speed, low-noise arc-shaped fan blade according to claim 1, characterized in that: There are 9 blades, and the 9 fan blades are evenly spaced at equal angles.

3. The high-speed, low-noise arc-shaped fan blade according to claim 1, characterized in that: The outer side of the wheel hub has a recess and a blind hole, with the depth of the blind hole being greater than the depth of the recess.

4. The high-speed, low-noise arc-shaped fan blade according to claim 3, characterized in that: The blind hole is equipped with a plug post, and the plug post has a socket.

5. The high-speed, low-noise arc-shaped fan blade according to claim 4, characterized in that: The diameter of the plug is smaller than the diameter of the blind hole. The blind hole is equipped with a reinforcing rib, and the two ends of the reinforcing rib are connected to the plug and the wall of the blind hole, respectively.

6. The high-speed, low-noise arc-shaped fan blade according to claim 1, characterized in that: The inner side of the wheel hub is hollowed out to form a cavity, and the cavity ring is equipped with reinforcing ribs.

Images