Ultra-silence cooling fan blade and cooling fan

Abstract

The utility model discloses an ultra-silence cooling fan blade and a cooling fan. Triangular or triangle-like protrusions or pits are evenly arranged on the surface of the fan blade in an array mode in the wind cutting direction and the wind outlet direction. According to the ultra-silence cooling fan blade and the cooling fan, the triangular or triangle-like protrusions or pits are designed on the surface of the fan blade in an array mode, tiny turbulent flow can be formed on the surfaces of the protrusions or the pits when the fan operates, and the turbulent flow is evenly formed; the fluid is blown out by being attached to the surface more tightly, so that the low-pressure area is reduced, the resistance is reduced, the airflow is more stable, and the air supply distance is farther; and resonance can be inhibited, and noise is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cooling fan technology, specifically an ultra-quiet cooling fan blade and a cooling fan. Background Technology

[0002] Traditional cooling fans are prone to noise amplification due to resonance during operation, making the noise even louder; the smooth surface of the fan blades allows fluid to quickly detach after passing through the blades, forming a low-pressure area, which leads to a significant increase in resistance, reduced airflow speed, and reduced air delivery distance; unreasonable fan blade design leads to uneven turbulence, increasing resistance and causing additional noise.

[0003] Therefore, the aforementioned technical problems need to be solved. Summary of the Invention

[0004] This utility model addresses the above-mentioned technical problems by providing an ultra-quiet cooling fan blade and cooling fan. By designing triangular or near-triangular protrusions or pits in an array on the surface of the fan blade, micro-turbulence is formed on the surface of the protrusions or pits when the fan is running, and the turbulence is uniformly formed. This allows the fluid to be blown out more closely to the surface, thereby reducing low-pressure areas, reducing resistance, making the airflow more stable, and extending the air delivery distance. It can also suppress resonance and reduce noise.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An ultra-quiet cooling fan blade, wherein the surface of the fan blade is provided with triangular or near-triangular protrusions or pits evenly arranged along the cutting direction and the air outlet direction.

[0007] The triangular or near-triangular protrusions or depressions on the surface of the ultra-quiet cooling fan blades serve to enhance airflow (an optimized aerodynamic design), allowing the air to travel further after passing through the air duct. When the fan is running, it creates tiny turbulence on the protrusions or depressions, and this uniform turbulence allows the fluid to adhere more closely to the surface, thereby reducing low-pressure areas, reducing resistance, and making the airflow more stable and the delivery distance longer. It can also suppress resonance and reduce noise.

[0008] A further optimized design features triangular protrusions with a height of 0.1–0.5 mm, a side length of 1–3 mm, and a spacing of 2–5 mm between adjacent protrusions. These triangular protrusions of this size more effectively enhance wind pressure stability.

[0009] In a further optimized design, the apex of the triangular protrusion on the fan blade surface along the airflow direction faces the fan blade rotation direction, and the base angle of the protrusion is 30° to 60°. This triangular protrusion design helps optimize turbulence generation and reduce the risk of boundary layer separation.

[0010] In a further optimized design, several toothed structures are provided on the opposite side of the fan blade corresponding to the airflow direction. These toothed structures increase the surface area of ​​the fan blade, enhancing aerodynamics and improving torque and lift, thereby increasing the fan's efficiency and performance. The toothed structures also improve the stability of the fan blade, altering its structure and making it more stable during rotation, less prone to twisting or other instabilities. Furthermore, the toothed structures reduce fluid turbulence, thus reducing noise generation.

[0011] Further optimization involves designing a wavy, streamlined outline for the outer edge of the fan blades. This wavy, streamlined outline mimics the structural design of butterfly wings. Simulation software reveals a noise source at the outermost edge of the fan blades; therefore, a wing-like structure is now being designed to further reduce noise.

[0012] In a further optimized design, the hub surface of the fan blades is provided with a tapered thread structure. When fluid flows over the fan blades, the tapered thread structure on the hub surface causes the fluid to adhere to the wall, ensuring smooth flow, reducing turbulence and eddies, and thus reducing noise; the tapered thread can better disperse the centrifugal force generated by the fan, reducing vibration.

[0013] A further optimization of the design involves replacing the triangular protrusion with a trapezoidal protrusion or a protrusion resembling the shape of a shark's body. The trapezoidal or shark-like protrusions also reduce airflow resistance and enhance wind pressure stability, thereby increasing the air delivery distance.

[0014] A cooling fan, comprising the ultra-quiet cooling fan blades described above.

[0015] Further optimization of the scheme also includes a rotor shaft core and a stator assembly; the fan blade has a fan blade seat, which is arranged around the stator assembly and its center is fixed on the rotor shaft core; a motor housing is provided on the inner cylindrical surface of the fan blade seat, and a number of magnetic strips are provided inside the motor housing.

[0016] A further optimized design includes an oil-impregnated bearing. The rotor shaft passes through the shaft hole of the oil-impregnated bearing, and one end of the rotor shaft has a shaft retainer to position the oil-impregnated bearing. An anti-friction washer is provided between the shaft retainer and the oil-impregnated bearing. The oil-impregnated bearing and anti-friction washer help reduce friction during rotor rotation and lower noise.

[0017] Compared with the prior art, the ultra-quiet cooling fan blades and cooling fan of this utility model have the following technical advantages:

[0018] 1. Reduce noise: Noise is reduced by 5-10 dB under the same air volume, and high-frequency noise is reduced by more than 30%;

[0019] 2. Increase wind pressure: For fans of the same power, wind pressure can be increased by 15-20%, and the air delivery distance can be increased by 25%. Attached Figure Description

[0020] Figure 1 This is a three-dimensional view of the first specific embodiment of the ultra-quiet cooling fan blade of this utility model;

[0021] Figure 2 yes Figure 1 A stereoscopic view from another perspective;

[0022] Figure 3 yes Figure 1 The main view;

[0023] Figure 4 yes Figure 3 The left view;

[0024] Figure 5 yes Figure 3 Top view;

[0025] Figure 6 This is a perspective view of the second embodiment of the ultra-quiet cooling fan blade of this utility model;

[0026] Figure 7 This is a three-dimensional view of the third embodiment of the ultra-quiet cooling fan blade of this utility model;

[0027] Figure 8 yes Figure 7 A stereoscopic view from another perspective;

[0028] Figure 9 This is a cross-sectional view of a specific embodiment of the cooling fan of this utility model;

[0029] Figure 10 It is an application Figure 9 Detailed structural diagram of the cooling fan of the blower.

[0030] In the figure: fan blade 10, protrusion 11, fan blade seat 12, toothed structure 13, threaded structure 14, rotor shaft core 20, stator assembly 30, silicon steel sheet 31, winding 32, circuit board 33, motor housing 40, magnetic strip 50, oil-impregnated bearing 60, shaft core retaining ring 70, anti-friction washer 80, outer frame 90, mounting hole 91. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0032] like Figures 1 to 5 As shown, this is the first embodiment of the ultra-quiet cooling fan blade of the present invention. Figure 6As shown, this is a second embodiment of the ultra-quiet cooling fan blade of the present invention. Figure 7 and Figure 8 As shown, this is the third embodiment of the ultra-quiet cooling fan blade of this utility model. Figure 9 and Figure 10 As shown, a specific embodiment of the cooling fan of this utility model is presented.

[0033] like Figures 1 to 5 As shown, the ultra-quiet cooling fan blade 10 of the first embodiment has triangular or triangular protrusions 11 evenly arranged on its surface along the cutting direction and the air outlet direction.

[0034] The triangular or near-triangular protrusions 11 on the surface of the ultra-quiet cooling fan blades 10 serve to enhance airflow, allowing the air to travel further after passing through the air duct. When the fan is running, it creates tiny turbulence on the surface of the protrusions 11, and the turbulence is formed evenly, allowing the fluid to adhere more closely to the surface and be blown out, thereby reducing low-pressure areas, reducing resistance, making the airflow more stable, and extending the air delivery distance. It can also suppress resonance and reduce noise.

[0035] like Figure 1 and Figure 2 As shown, the fan blade 10 has several toothed structures 13 on the opposite side corresponding to the wind-cutting direction. The toothed structures increase the surface area of ​​the fan blade, enhance the aerodynamic effect, and improve the torque and lift of the fan blade, thereby improving the efficiency and performance of the fan. The toothed structures on the fan blade can also improve the stability of the fan blade, changing the structure of the fan blade so that the fan blade can be more stable when rotating and is less prone to instability such as twisting. The toothed structures can also reduce the turbulence generated by the fluid, thereby reducing the generation of noise.

[0036] The height of the triangular protrusion 11 is 0.1–0.5 mm, the side length is 1–3 mm, and the spacing between adjacent protrusions 11 is 2–5 mm. Specifically, the height of the triangular protrusion 11 is 0.3 mm, the side length is 2×2×1.6 mm, and the spacing between adjacent protrusions 11 is 3 mm. This size of triangular protrusion 11 more effectively enhances wind pressure stability. Tests show that at a speed of 3000 rpm, the noise level is 28 dB(A), the airflow is increased by 18%, and the wind pressure is increased by 22%.

[0037] In addition, such as Figure 3 As shown, the triangular protrusion 11 on the outer ring side of the fan blade 10 has a smaller shape than the protrusion 11 on the inner ring side.

[0038] The surface of the fan blade 10 is uniformly distributed with triangular protrusions 11. Their geometric parameters (height, side length, and spacing) can be optimized through fluid dynamics simulation. They generate uniform microturbulence in the boundary layer, suppressing airflow separation and reducing resistance, thereby increasing wind pressure and delivery distance.

[0039] like Figure 1 As shown, the apex of the triangular protrusion 11 on the surface of the fan blade 10 along the air outlet direction faces the rotation direction of the fan blade 10. Specifically... Figure 3 As shown, the vertices of the triangular protrusions 11 on the air outlet surface of the fan blade 10 are located on the same annular surface, and the vertices of the triangular protrusions 11 on the side surface of the fan blade 10 are also located on the same annular surface. This arrangement of the triangular protrusions 11 helps to optimize turbulence generation and reduce the risk of boundary layer separation.

[0040] The fan blade 10 is made of lightweight composite material with a nano-scale hydrophobic coating on its surface. This helps to further reduce air friction noise.

[0041] from Figure 1 or Figure 3 Viewed from the indicated direction, the ultra-quiet cooling fan blades 10 of the first embodiment rotate counterclockwise.

[0042] like Figure 6 As shown, the ultra-quiet cooling fan blade 10 of the second embodiment differs from that of the first embodiment in that the rotation direction is different. The fan blade 10 of the second embodiment rotates clockwise when viewed from the direction shown in the figure.

[0043] In addition, the ultra-quiet cooling fan blade 10 of this invention can also be provided with triangular protrusions 11, which can be trapezoidal protrusions 11 or protrusions 11 resembling the shape of a shark's body. Trapezoidal protrusions 11 or protrusions 11 resembling the shape of a shark's body also have the effect of enhancing wind pressure stability and increasing air delivery distance.

[0044] like Figure 7 and Figure 8 As shown, the ultra-quiet cooling fan blade 10 of the third embodiment of this utility model differs from that of the first embodiment in that the outer edge of the fan blade 10 has a wavy streamlined profile 15 and the hub surface of the fan blade is provided with a conical thread structure 14. The wavy streamlined profile is a design that mimics the structure of butterfly wings. As can be seen from the simulation software, there is a noise source at the outermost edge of the fan blade. The design of the wing structure further reduces noise. When the fluid flows over the fan blade, the conical thread structure on the hub surface causes the fluid to adhere to the wall, ensuring smooth flow and reducing turbulence and eddies, thereby reducing noise. The conical thread can better disperse the centrifugal force generated by the fan, reducing vibration.

[0045] This utility model also discloses a cooling fan, including the ultra-quiet cooling fan blades 10 of one of the first, second or third embodiments described above.

[0046] like Figure 9 and Figure 10As shown, the cooling fan also includes a rotor shaft core 20 and a stator assembly 30; the fan blade 10 has a fan blade seat 12, which is arranged around the stator assembly 30 and its center is fixed on the rotor shaft core 20; a motor housing 40 is provided on the inner cylindrical surface of the fan blade seat 12, and a number of magnetic strips 50 are provided inside the motor housing 40.

[0047] like Figure 9 and Figure 10 As shown, the cooling fan also includes an oil-impregnated bearing 60. A rotor shaft 20 passes through the shaft hole of the oil-impregnated bearing 60. One end of the rotor shaft 20 is provided with a shaft retainer 70 to position the oil-impregnated bearing 60. An anti-friction washer 80 is provided between the shaft retainer 70 and the oil-impregnated bearing 60. The oil-impregnated bearing 60 and the anti-friction washer 80 help reduce friction during rotor rotation and lower noise.

[0048] like Figure 10 As shown, the stator assembly 30 includes silicon steel sheets 31, windings 32, and a circuit board 33. The cooling fan also has an outer frame 90, with mounting holes 91 on both sides of the outer frame 90 for fixing the fan.

[0049] The ultra-quiet cooling fan blades and cooling fan are designed with triangular or near-triangular protrusions in an array on the surface of the fan blades. When the fan is running, tiny turbulence is formed on the surface of the protrusions, and the turbulence is formed evenly. This allows the fluid to be blown out more closely along the surface, thereby reducing low-pressure areas, reducing resistance, making the airflow more stable, and extending the air delivery distance. It can also suppress resonance and reduce noise.

[0050] In summary, as described in the specification and figures, this utility model has been manufactured into actual samples and subjected to multiple use tests. The test results demonstrate that this utility model achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of this utility model. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this utility model, without departing from the scope of the technical features and similar features disclosed in this utility model, are all within the protection scope of this utility model.

Claims

1. A type of ultra-quiet cooling fan blade, characterized in that: The surface of the fan blade (10) is provided with triangular or triangular protrusions (11) or pits evenly arranged along the cutting direction and the air outlet direction.

2. The ultra-quiet cooling fan blade according to claim 1, characterized in that, The height of the triangular protrusion (11) is 0.1 to 0.5 mm, the side length is 1 to 3 mm, and the distance between adjacent protrusions (11) is 2 to 5 mm.

3. The ultra-quiet cooling fan blade according to claim 1, characterized in that, The apex of the triangular protrusion (11) on the surface of the fan blade (10) along the air outlet direction faces the rotation direction of the fan blade (10), and the base angle of the protrusion (11) is 30° to 60°.

4. The ultra-quiet cooling fan blade according to claim 1, characterized in that, The fan blade (10) has several tooth-like structures (13) on the other side corresponding to the wind cutting direction.

5. The ultra-quiet cooling fan blade according to claim 1, characterized in that, The outer edge of the fan blade (10) has a wavy, streamlined profile.

6. The ultra-quiet cooling fan blade according to claim 1, characterized in that, The hub surface of the fan blade (10) is provided with a tapered thread structure (14).

7. The ultra-quiet cooling fan blade according to claim 1, characterized in that, The triangular protrusion (11) is a trapezoidal protrusion (11) or a protrusion (11) similar to the shape of a shark's body.

8. A cooling fan, characterized in that: Includes the ultra-quiet cooling fan blades (10) as described in any one of claims 1 to 5.

9. The cooling fan according to claim 8, characterized in that, It also includes a rotor shaft core (20) and a stator assembly (30); the fan blade (10) has a fan blade seat (12), the fan blade seat (12) is arranged around the stator assembly (30), and its center is fixed on the rotor shaft core (20); a motor housing (40) is provided on the inner cylindrical surface of the fan blade seat (12), and a plurality of magnetic strips (50) are provided inside the motor housing (40).

10. The cooling fan according to claim 9, characterized in that, It also includes an oil-impregnated bearing (60), the rotor shaft core (20) is provided through the shaft hole of the oil-impregnated bearing (60), one end of the rotor shaft core (20) is provided with a shaft core retainer (70) to position the oil-impregnated bearing (60), and an anti-friction washer (80) is provided between the shaft core retainer (70) and the oil-impregnated bearing (60).

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