Energy-saving cooling fan blade

Abstract

The invention discloses an energy-saving type cooling fan blade, and relates to the technical field of cooling fans, the energy-saving type cooling fan blade comprises a hub, a plurality of blades are uniformly and asymmetrically arranged on the hub in a circumferential shape, a plurality of asymmetrical flow guide strips with different sizes are arranged on the blades, and the flow guide strips extend in the length direction of the blades; each blade comprises a supporting section, a connecting transition section and a free section, the supporting sections, the connecting transition sections and the free sections are sequentially distributed from the hub in the length direction of the blades, and the thickness of the blades is gradually reduced from the supporting sections to the free sections; the lengths and the widths of the plurality of flow guide strips are gradually increased in the direction from the connection transition section to the free section; a spiral heat dissipation channel is arranged in the hub; according to the fan blade, airflow is guided to be in smooth transition, vortex is reduced, noise generated when the fan blade works is reduced, meanwhile, the stability of the fan blade in the moving process is improved, the hub cooling effect is guaranteed, energy waste is reduced, and meanwhile the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation fans, and in particular to an energy-saving heat dissipation fan blade. Background Art

[0002] With the continuous development and progress of electronic equipment, electronic equipment is gradually moving towards high integration and high power density. Heat dissipation issues are becoming more and more important in electronic equipment. The heat dissipation effect is directly related to the stability of the operation of electronic equipment during use. As the core component for heat dissipation and cooling of electronic equipment, the efficiency, noise and energy consumption of the heat dissipation fan directly determine the overall heat dissipation effect. The uniform guide structure of traditional fan blades can easily lead to airflow separation and generate high-frequency eddy current noise, especially when running at high speed. The noise is relatively large, which affects the user experience of the electronic equipment.

[0003] Although the prior art attempts to alleviate noise by increasing the number of blades or reducing the rotation speed, increasing the number of blades will increase energy consumption, reduce heat dissipation efficiency, and increase production costs. The fan blades in the prior art lack an effective flow guide design. When the fan blades run at high speed, the airflow forms turbulence near the hub, which causes the local temperature of the radiator to be too high, affecting the heat dissipation effect and efficiency. Summary of the invention

[0004] In response to the above technical problems, the present invention provides an energy-saving heat dissipation fan blade, including a hub, on which a plurality of blades are evenly and asymmetrically arranged in a circular shape, and the blades are provided with a plurality of asymmetric guide strips of different sizes, and the guide strips extend along the length direction of the blades; the blades include a supporting section, a connecting transition section and a free section, and the supporting section is installed on the hub, and the supporting section, the connecting transition section and the free section are distributed in sequence from the hub along the length direction of the blades, and the thickness of the blades gradually decreases from the supporting section to the free section; the length and width of the plurality of guide strips gradually increase from the connecting transition section to the free section; and a spiral heat dissipation channel is provided inside the hub.

[0005] Furthermore, a serrated edge is provided on one side of the blade, the height of the serrations on the serrated edge is 0.1-0.3 mm, and the spacing between the serrations on the serrated edge is 0.5-1 mm.

[0006] Furthermore, the curvature of the supporting section is greater than the curvature of the free section, and the length of the connecting transition section accounts for 20%-30% of the total length of the blade.

[0007] Furthermore, the width of the guide strip near the free section is 0.8-1.2 mm, and the width of the guide strip near the connecting transition section is 0.3-0.6 mm.

[0008] Furthermore, annular grooves are provided at the upper and lower ends of the outer surface of the hub, and a filling ring is provided inside each annular groove. The filling ring is made of a noise reduction and shock absorbing material with honeycomb holes, and the cross-section of the heat dissipation channel is trapezoidal.

[0009] Furthermore, a through hole is opened inside the wheel hub, and a connecting shaft for connecting to the brushless motor is installed in the through hole through a plurality of supporting ribs.

[0010] Furthermore, a rounded corner structure is provided at one end of the free section away from the hub, and the radius of the rounded corner structure is 0.3-0.7 mm.

[0011] Furthermore, the surface of the blade is coated with a nano-scale hydrophobic coating, the coating thickness is 10-20 μm, and the surface roughness Ra≤0.1 μm.

[0012] Furthermore, the hub and the blades are both made of carbon fiber reinforced composite material and are integrally formed. The carbon fiber content in the carbon fiber reinforced composite material is 40%-50%, and the matrix is ​​polyetheretherketone resin.

[0013] Furthermore, the number of the blades is an odd number and is greater than or equal to 5.

[0014] Compared with the prior art, the present invention has the following advantages: (1) By providing a plurality of asymmetric guide strips of different sizes on the blade, the present invention can guide the airflow to smoothly transition when the blade moves, thereby reducing the generation of vortices; by providing a serrated edge on one side of the blade, the boundary layer turbulence can be destroyed when the blade moves, and at the same time, in conjunction with the filling ring inside the annular groove, the noise generated when the fan blade is working is greatly reduced. At the same time, the filling ring can absorb the vibration energy generated when the hub is working, thereby extending the working life of the hub; (2) By setting the support section, the connecting transition section and the free section to different thicknesses, the present invention optimizes the stress distribution of the blade, thereby avoiding damage to the blade due to resonance when the blade moves. , combined with the high curvature of the support section, the bending strength of the support section is increased. By setting a rounded structure at the end of the support section, the adhesion of the airflow on the blade is optimized, so that the airflow flows more smoothly along the blade surface, reducing energy loss and avoiding material fatigue or cracks caused by excessive local stress during high-speed rotation; (3) The present invention provides a heat dissipation channel inside the hub, so that the fan blade can use the airflow generated by itself to cool the inside of the hub when it is working. In addition, since the heat dissipation channel is set in a spiral shape, the axial airflow can be converted into a rotating flow, thereby improving the uniformity of the airflow organization, ensuring the stability and uniformity of the cooling of the hub, improving the cooling effect of the hub, and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1The overall structure of an energy-saving heat dissipation fan blade of the present invention is shown in FIG. Figure 1 .

[0016] Figure 2 The overall structure of an energy-saving heat dissipation fan blade of the present invention is shown in FIG. Figure 2 .

[0017] Figure 3 The overall structure of an energy-saving heat dissipation fan blade of the present invention is shown in FIG. Figure 3 .

[0018] Figure 4 It is a schematic exploded view of the overall structure of an energy-saving heat dissipation fan blade of the present invention.

[0019] Figure 5 The figure is a top view of an energy-saving heat dissipation fan blade according to the present invention.

[0020] Figure 6 For the present invention Figure 5 Cross-sectional view along the AA direction.

[0021] Figure numbers: 1-hub; 2-blade; 101-support rib; 102-connecting shaft; 103-heat dissipation channel; 104-filling ring; 105-annular groove; 201-support section; 202-connecting transition section; 203-free section; 204-rounded structure; 205-guide strip; 206-serrated edge. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0023] Example: Figure 1-Figure 6 An energy-saving heat dissipation fan blade shown includes a hub 1, on which a plurality of blades 2 are evenly and asymmetrically arranged in a circular shape, and on which a plurality of asymmetric guide strips 205 of different sizes are arranged, and the guide strips 205 extend along the length direction of the blade 2; the blade 2 includes a support section 201, a connecting transition section 202 and a free section 203, and the support section 201 is installed on the hub 1, and the support section 201, the connecting transition section 202 and the free section 203 are distributed in sequence from the hub 1 along the length direction of the blade 2, and the thickness of the blade 2 gradually decreases from the support section 201 toward the free section 203; the length and width of the plurality of guide strips 205 gradually increase from the connecting transition section 202 toward the free section 203.

[0024] A serrated edge 206 is provided on one side of the blade 2, the height of the serrations on the serrated edge 206 is 0.1-0.3mm, and the spacing between the serrations on the serrated edge 206 is 0.5-1.mm; the curvature of the support section 201 is greater than the curvature of the free section 203, and the length of the connecting transition section 202 accounts for 20-30% of the total length of the blade 2; a fillet structure 204 is provided at one end of the free section 203 away from the hub 1, and the radius of the fillet structure 204 is 0.3-0.7mm; the width of the guide strip 205 close to the free section 203 is 0.8-1.2mm, and the width of the guide strip 205 close to the connecting transition section 202 is 0.3-0.6mm.

[0025] The present invention provides a plurality of asymmetric guide strips 205 of different sizes on the blade 2, so that the blade 2 can guide the airflow to smoothly transition when in motion, reduce the generation of eddies, and thus reduce eddy noise; by providing a serrated edge 206 on one side of the blade 2, the boundary layer turbulence can be destroyed when the blade 2 moves, and the noise generated when the blade 2 moves can be reduced. At the same time, in conjunction with the filling ring 104 inside the annular groove 105, the noise generated when the fan blade is working is greatly reduced, and the vibration energy generated when the hub 1 is working can be absorbed by the filling ring 104, thereby extending the working life of the hub 1; by connecting the support section 201, the connecting transition section 202 and the free section 20 3 is set to different thicknesses, thereby optimizing the stress distribution of the blade 2 and avoiding damage to the blade 2 due to resonance during movement. The high curvature of the support section 201 increases the bending strength of the support section 201. By setting a rounded structure 204 at the end of the support section 201, the adhesion of the airflow on the blade 2 is optimized, so that the airflow flows more smoothly along the surface of the blade 2 and reduces noise. At the same time, the different thickness designs of the support section 201, the connecting transition section 202 and the free section 203 are combined to further optimize the stress distribution of the blade 2, reduce energy loss, avoid material fatigue or cracks caused by excessive local stress during high-speed rotation, and increase the service life of the blade 2.

[0026] A spiral heat dissipation channel 103 is arranged inside the wheel hub 1, and the cross-section of the heat dissipation channel 103 is trapezoidal; annular grooves 105 are provided at the upper and lower ends of the outer surface of the wheel hub 1, and a filling ring 104 is provided inside each of the annular grooves 105, and the filling ring 104 is made of a noise reduction and shock absorbing material with honeycomb holes; a through hole is opened inside the wheel hub 1, and a connecting shaft 102 for connecting to a brushless motor is installed in the through hole through a plurality of support ribs 101.

[0027] The present invention provides a spiral heat dissipation channel 103 inside the wheel hub 1, so that when the fan blades are working, they can use the airflow generated by themselves to cool the inside of the wheel hub 1. In addition, by providing the heat dissipation channel 103 with a spiral shape, the axial airflow can be converted into a rotating flow, thereby improving the uniformity of heat dissipation, ensuring the stability and uniformity of cooling the wheel hub 1, improving the cooling effect of the wheel hub 1, and reducing energy waste.

[0028] The surface of the blade 2 is coated with a nano-scale hydrophobic coating with a coating thickness of 10-20 μm and a surface roughness of Ra≤0.1 μm; the hub 1 and the blade 2 are both made of carbon fiber reinforced composite materials and are integrally formed. The carbon fiber content in the carbon fiber reinforced composite material is 40%-50%, and the matrix is ​​polyetheretherketone resin; the number of the blades 2 is an odd number and is greater than or equal to 5.

[0029] In the present invention, the hub 1 and the blades 2 are both made of carbon fiber reinforced composite materials and are integrally formed, thereby increasing the high temperature resistance, corrosion resistance, and fatigue resistance of the fan blades. The hub 1 and the blades 2 are seamlessly connected through injection molding or hot pressing processes, eliminating the bolt or welding weaknesses in traditional assembly and avoiding the risk of breakage due to stress concentration.

[0030] In the present invention, the number of blades 2 is set to an odd number greater than or equal to 5, and is distributed asymmetrically. The odd-numbered layout destroys the rotational symmetry, avoids the periodic resonance that may be generated when it is set to an even number, and significantly reduces noise and vibration. In addition, setting it to an odd number and an asymmetrical layout can stagger the airflow disturbance in space, reduce the concentrated generation of turbulence and eddies, thereby improving the heat dissipation efficiency and reliability of the blade 2.

Claims

1. An energy-saving heat dissipation fan blade, comprising a hub (1), on which a plurality of blades (2) are evenly and asymmetrically arranged in a circumferential shape, characterized in that: The blade (2) is provided with a plurality of asymmetric guide strips (205) of different sizes, the guide strips (205) extending along the length direction of the blade (2); the blade (2) comprises a support section (201), a connecting transition section (202) and a free section (203); the support section (201) is mounted on the hub (1); the support section (201), the connecting transition section (202) and the free section (203) are sequentially distributed from the hub (1) along the length direction of the blade (2); the thickness of the blade (2) gradually decreases from the support section (201) toward the free section (203); the length and width of the plurality of guide strips (205) gradually increase from the connecting transition section (202) toward the free section (203); and a spiral heat dissipation channel (103) is provided inside the hub (1).

2. An energy-saving heat dissipation fan blade as claimed in claim 1, characterized in that: A serrated edge (206) is provided on one side of the blade (2); the height of the serrations on the serrated edge (206) is 0.1-0.3 mm, and the spacing between the serrations on the serrated edge (206) is 0.5-1 mm.

3. An energy-saving heat dissipation fan blade as claimed in claim 1, characterized in that: The curvature of the support section (201) is greater than the curvature of the free section (203), and the length of the connecting transition section (202) accounts for 20%-30% of the total length of the blade (2).

4. The energy-saving heat dissipation fan blade according to claim 1, characterized in that: The width of the guide strip (205) close to the free section (203) is 0.8-1.2 mm, and the width of the guide strip (205) close to the connecting transition section (202) is 0.3-0.6 mm.

5. The energy-saving heat dissipation fan blade according to claim 1, characterized in that: Annular grooves (105) are provided at the upper and lower ends of the outer surface of the hub (1), a filling ring (104) is provided inside each annular groove (105), the filling ring (104) is made of a noise reduction and vibration reduction material with honeycomb holes, and the cross section of the heat dissipation channel (103) is trapezoidal.

6. The energy-saving heat dissipation fan blade according to claim 1, characterized in that: A through hole is provided inside the wheel hub (1), and a connecting shaft (102) for connecting to a brushless motor is installed in the through hole via a plurality of supporting ribs (101).

7. The energy-saving heat dissipation fan blade according to claim 1, characterized in that: A rounded corner structure (204) is provided at one end of the free section (203) away from the hub (1), and the radius of the rounded corner structure (204) is 0.3-0.7 mm.

8. The energy-saving heat dissipation fan blade according to claim 1, characterized in that: The surface of the blade (2) is coated with a nano-scale hydrophobic coating, the coating thickness is 10-20 μm, and the surface roughness Ra is ≤ 0.1 μm.

9. The energy-saving heat dissipation fan blade according to claim 1, characterized in that: The hub (1) and the blades (2) are both made of carbon fiber reinforced composite material and are integrally formed. The carbon fiber content in the carbon fiber reinforced composite material is 40%-50%, and the matrix is ​​polyetheretherketone resin.

10. The energy-saving heat dissipation fan blade according to claim 1, characterized in that: The number of the blades (2) is an odd number and is greater than or equal to 5.

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