TWM653197U - Fan blade structure - Google Patents

Abstract

This invention creates a fan blade structure, which includes a hub and a plurality of blades. The hub has a top wall and a side wall. The blades are ring-mounted on the side wall, and their upper and lower surfaces are respectively a leeward side and a windward side. , each blade has a leading edge along the blade rotation direction, a trailing edge, a root provided on the side wall and a tip opposite to the root, and there is at least one first section between the tip and the root. and a second section, the first section is between the second section and the tip, the second section is between the first section and the root, and the thickness of the second section is greater than Or less than the thickness of the first section, so that the blade forms a step-like configuration with a height difference on the windward surface. Through the step-like configuration, the fluid resistance is effectively reduced to reduce the power consumption of the fan, thereby effectively improving the efficiency of the fan. Fan efficiency.

Description

Fan blade structure

This creation is about a fan blade structure, and in particular, a fan blade structure that can improve fan efficiency.

With the booming development of the electronics industry, the heat generated by electronic components is gradually increasing. The previous method of using natural convection to solve waste heat is gradually inadequate. At this time, cooling fans provide an excellent choice, so cooling fans have become an indispensable role in current electronic products (servers or communication systems or computers). Nowadays, commonly used cooling fans, such as axial fans, are increasingly demanding in response to the increasingly stringent requirements for heat dissipation of electronic products, which tends to increase the speed of fans. Correspondingly, the issue of energy saving is becoming more and more important. Please refer to Figures 5A and 5B. The fan wheel 31 of the heat dissipation fan includes a hub 311 and a plurality of blades 312 arranged on the outer side of the hub. The windward surface 313 and the leeward surface 314 of each blade 312 are both smooth (linear and flat) surfaces. Therefore, when the blades 312 of the fan wheel 31 rotate, airflow will be generated. However, since the smooth windward surface 313 of the blade 312 cannot restrain the airflow from being pushed toward the axial air outlet of the heat dissipation fan, part of the airflow will be retained on the windward surface 313 and fluid resistance will be generated. As a result, part of the retained airflow will eventually slip and disperse on the smooth windward surface 313 of the blade 312 and be lost, thereby reducing the efficiency of the fan. In addition, the increase in the above-mentioned fluid resistance will inevitably cause the maximum energy (power) consumption of the fan, which will inevitably increase the power consumption of the fan. In other words, the fan must increase the input of the motor power to maintain the same speed, thus resulting in the problem that the power consumption of the fan operation cannot achieve energy saving. Therefore, how to solve the above-mentioned problems and shortcomings of fan power consumption and low fan efficiency is the direction that the creator of this case and related industry practitioners are eager to study and improve.

Therefore, in order to effectively solve the above-mentioned problems, one purpose of this invention is to provide a fan blade structure that can reduce fluid resistance to reduce the power consumption of the fan, so as to effectively improve the fan efficiency. In order to achieve the above purpose, the present invention provides a fan blade structure, which includes a hub and a plurality of blades. The hub has a top wall and a side wall extending outward from the periphery of the top wall. The blades are arranged in a radial ring. On the side wall, the upper surface and the lower surface of the blade are respectively a leeward surface and a windward surface corresponding to the leeward surface, and each blade has a leading edge, a trailing edge, a root portion and a tip portion, and the root portion is provided on the side wall of the hub, and relative to the tip, there is at least a first section and a second section between the tip and the root of the blade, and the first section is located in the second section between the section and the tip of the blade, the second section is between the first section and the root of the blade, and the thickness of the second section is greater than or less than the thickness of the first section, so that the The blades form a stepped configuration with a height difference on the windward surface. By forming the step-like configuration of the height difference on the windward surface of the blade, the direction of the airflow on the windward surface can be changed to reduce the resistance of the airflow, thereby improving the fan efficiency and reducing the power consumption of the fan. .

The above-mentioned purpose of the invention and its structural and functional characteristics will be explained according to the preferred embodiments of the attached drawings. The invention provides a fan blade structure 1, please refer to Figures 1, 2A, and 3. The fan blade structure 1 is applied to a fan 2 structure (such as an axial flow fan, a frameless fan, or a series fan). In this embodiment, the fan blade structure 1 is installed in a frame 21 of the fan 2 structure (such as an axial flow fan), and the frame 21 has an air inlet 24 and an air outlet 25 relative to the air inlet 24. The fan blade structure 1 includes a hub 11 and a plurality of blades 12. The hub 11 has a top wall 111 and a side wall 112. The side wall 112 is formed by extending outward from the periphery of the top wall 111. The top wall 111 and the side wall 112 define a receiving space 113. A shaft 14 and a magnetic element 15 (such as a magnet) are provided in the hub 11. One end of the shaft 14 is fixedly arranged at the center of the receiving space 113 of the hub 11. The other end of the shaft 14 is pivotally arranged with a shaft seat 22 provided in a frame 21. The magnetic element 15 is provided on the inner circumference of the hub 11 to be inductively excited correspondingly with a stator 23 provided on the shaft seat 22. The blades 12 are arranged around the side wall 112 of the hub 11. The upper and lower surfaces of the blade 12 are respectively a leeward surface 121 and a windward surface 122 corresponding to the leeward surface 121. The leeward surface 121 (suction surface) is located on the upper surface of the blade 12 and corresponds to the air inlet 24 of the frame 21. The windward surface 122 (pressure surface (wind pushing surface)) is located on the lower surface of the blade 12 and corresponds to the air outlet 25 of the frame 21. Each blade 12 has a leading edge 123, a trailing edge 124, a root 125 and a tip 126 in the rotation direction of the blade 12. The root 125 of the blade 12 is combined with the side wall 112 of the hub 11 and is opposite to the tip 126 of the blade 12. Continuing to refer to FIGS. 1, 2A, and 3, each blade 12 has at least one first section 129 and one second section 130 between the tip 126 and the root 125. The thickness h1 and h2 of the first and second sections 129 and 130 of the blade 12 are the thicknesses from the leeward side 121 to the windward side 122. The first section 129 of the blade 12 is located between the second section 130 and the tip 126 of the blade 12. The second section 130 of the blade 12 is located between the first section 129 and the root 125 of the blade 12, and the thickness h2 of the second section 130 of the blade 12 is greater than or less than the thickness h1 of the first section 129 of the blade 12. In the present embodiment, the thickness h1 of the first section 129 of the blade 12 is less than the thickness h2 of the second section 130, that is, the thickness h1＜h2. The windward surfaces 122 of the first and second sections 129 and 130 of the blade 12 are arranged to face the same direction, so that a step-shaped configuration with a height difference is formed between the windward surface 122 of the first section 129 of the blade 12 and the windward surface 122 of the second section 130. The step-shaped configuration can be a single-step or multi-step step-shaped configuration located adjacent to the first section 129 of the blade 12, so as to guide and drive the airflow on the windward surface 122 to push toward the air outlet 25 of the frame 21 of the fan 2. The step-shaped configuration of each blade 12 has at least one step surface 127, which is an inclined surface (such as FIG. 2A) or a vertical surface (such as FIG. 2B) to change the direction of the airflow passing through the windward surface 122 of the blade 12, thereby reducing (lowering) the airflow resistance. The contour of the step surface 127 of the blade 12 is the same or different from the contour of the tip 126 of the blade 12. In addition, please refer to Figure 4A for a comparison diagram of the blade structure of the fan 2 of the present invention and the blade structure of the known fan. In the figure, the horizontal coordinate (CFM) represents the air volume and the vertical coordinate (mmAq) represents the wind pressure (static pressure), and the present invention is represented by a solid line, and the known is represented by a dotted line. Therefore, according to the experimental results, under the premise of the same size ratio and the same frame 21, the present invention has a higher wind pressure under the same air volume as the known fan, and has a larger air volume under the same wind pressure. It can be seen that the comparison of the experimental data of the present invention's fan 2 and the known fan can more clearly show that the present invention's fan 2 has the ability to increase the air volume and wind pressure. In addition, refer to Figure 4B, which is a schematic diagram comparing the measured air volume and static pressure efficiency of the blade structure of the fan 2 of the present invention and the blade structure of the known fan. In the figure, the horizontal coordinate (CFM) represents the air volume and the vertical coordinate (%) represents the static pressure efficiency. The present invention is represented by a solid line, and the known invention is represented by a dotted line. According to the experimental results, the efficiency of the fan 2 of the present invention is better than that of the known fan, and the static pressure efficiency of the fan 2 of the present invention is improved by 0.7%. It can be seen that the present invention can indeed effectively improve the efficiency of the fan 2 and save the power of the fan 2. In the above-mentioned embodiment, only a single-step stepped structure is provided between the tip 126 and the root 125 of the blade 12 in the first section 129, so that the windward surface 122 of the blade 12 is a non-smooth (flat) surface, but the present invention is not limited thereto. In another embodiment, referring to FIG. 2B , the step-shaped configuration may be arranged between the tip 126 and the root 125 of the blade 12 in a step-shaped configuration with two or more steps in the first section 129. Specifically, the blade 12 has a plurality of first sections 129 that gradually thicken (increase) in sequence toward the root 125 of the blade 12 to form a three-step (level) step-shaped configuration, and the height (thickness h2) of the previous step is lower than the height (thickness h3) of the adjacent next step, that is, the thickness h1＜h2＜h3. In this way, the step-shaped configuration is arranged in a multi-step step-shaped configuration, which can effectively reduce the airflow resistance and improve the efficiency of the fan 2. In other alternative implementations, the step-shaped structure may be arranged between the tip 126 and the root 125 of the blade 12 in a single-step or multi-step step-shaped second section 130. The blade 12 has a plurality of second sections 130 that gradually thicken (lower) toward the root 125 of the blade 12 to form a single-step or multi-step (level) step-shaped structure to reduce airflow resistance and improve the efficiency of the fan 2. In addition, in each embodiment, the width, height and length of each step of the step-shaped structure on the windward surface 122 are not limited to the structure shown in the figure. The width, height and length of each step can be designed to be the same or different according to the actual efficiency requirements of the fan 2, without limitation. Therefore, the invention forms a stepped configuration design with a height difference on the windward surface 122 of the blade 12, so that the direction of the airflow passing through the windward surface 122 of the blade 12 can be controlled through the stepped configuration in a single-step or multi-step staircase shape, so as to avoid the airflow slip loss on the windward surface 122, so that more airflow can be directly pushed to the air outlet 25 of the fan 2, thereby reducing the resistance of the airflow on the windward surface 122, which can effectively reduce the power consumption of the fan 2 and effectively achieve the effect of improving the fan efficiency.

1: Fan blade structure 11: Hub 111: Top wall 112: Side wall 113: Accommodation space 12: Blade 121: Leeward side 122: Windward side 123: Front edge 124: Rear edge 125: Root 126: Tip 127: Step surface 129: First section 130: Second section h1, h2, h3: Thickness 14: Axis 15: Magnetic element 2: Fan 21: Frame 22: Shaft seat 23: Stator 24: Air inlet 25: Air outlet

Figure 1 is a three-dimensional and partially enlarged schematic diagram of the fan blade structure of the present invention. Figure 2A is a partial cross-sectional schematic diagram of a blade of one embodiment of the present invention. Figure 2B is a partial cross-sectional schematic diagram of a blade of another embodiment of the present invention. Figure 3 is a combined cross-sectional schematic diagram of the fan of the present invention. Figure 4A is a schematic diagram comparing the measured curves of the blade structure of the fan of the present invention with the blade structure of a known fan. Figure 4B is a schematic diagram comparing the measured air volume and static pressure efficiency of the blade structure of the fan of the present invention with the blade structure of a known fan. Figure 5A is a three-dimensional schematic diagram of the known fan blade structure. Figure 5B is a partial cross-sectional schematic diagram of the known blade.

1: Fan blade structure

11:wheel hub

111: Top wall

112: Side wall

12: Leaves

121:Leeward side

122: Windward side

123: leading edge

124: Destiny

125: Root

126:Tip

129: Section 1

130: Second section

Claims (5)

A fan blade structure includes: a hub having a top wall and a side wall, wherein the side wall extends outward from the periphery of the top wall; and A plurality of blades are arranged around the side wall, and the upper and lower surfaces of the blades are respectively a leeward surface and a windward surface corresponding to the leeward surface. Each blade has a leading edge, a trailing edge, a root and a tip relative to the root along the rotation direction of the blade. The root is arranged on the side wall of the hub, and there are at least a first section and a second section between the tip and the root. The first section is located between the second section and the tip, and the second section is located between the first section and the root. The thickness of the second section is greater than or less than the thickness of the first section, so that a hierarchical configuration with a height difference is formed on the windward surface of the blade. As in the fan blade structure described in item 1 of the patent application, the stepped configuration has at least one stepped surface, and the stepped surface is a vertical plane or an inclined plane. As for the fan blade structure described in item 2 of the patent application, the windward surface of the blade has a non-smooth surface. The fan blade structure as described in item 1 of the patent application scope, wherein the step-shaped configuration is in a single-step or multi-step step-shaped configuration located in the first section of the blade. For the fan blade structure described in item 2 of the patent application, the contours of the step planes are the same or different corresponding to the tip contour of the blade.

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