Fan blade structure and heat dissipation device with multiple elevation angles

Abstract

The present invention discloses a fan blade structure and a heat dissipation device with multiple elevation angles, including: the fan blade structure is mainly composed of a plurality of blades with different elevation angles, the elevation angles of the blades decrease outward in sequence along the length direction of the fan blade structure, the tops of the plurality of blades are located on the same end face, and are an integrally formed structure, and the connection between the blades with different elevation angles has a smooth portion; the plurality of fan blade structures are evenly mounted on the hub and connected to the outer ring frame; the hub and the fan blade structure are integrally formed; or; the hub, the fan blade structure and the outer ring frame are integrally formed. The present invention has a simple structure and a reasonable design. The fan blade structure can guide the gas flow at multiple angles, multiple directions, and multiple levels when rotating, reduce the phenomenon of airflow detaching from the fan blade surface, inhibit the formation of backflow on the fan blade surface opposite to the mainstream direction of the airflow, reduce the generation of eddy turbulence in the flow field, increase the air volume, improve the heat dissipation efficiency, and reduce eddy noise and vibration.

Description

Technical Field

[0001] The present invention relates to a fan blade structure of a heat dissipation device, and more specifically, to a fan blade structure with multiple elevation angles and a heat dissipation device having the same. Background Art

[0002] As the processing speed and performance of electronic devices such as central processing units increase, electronic devices generate more heat during operation. The generated heat causes the temperature of the electronic device to rise, and if the heat cannot be effectively discharged to the outside, the reliability and performance of the electronic device will decrease. In order to prevent the electronic device from overheating, a heat dissipation device such as a fan is used to effectively dissipate the heat generated by the electronic device. The airflow generated by the heat dissipation fan blows over the heating element to produce a heat exchange effect, thereby dissipating the heat energy to the outside, thereby ensuring that the electronic device can operate normally.

[0003] Common cooling fans are mainly composed of a hub and a number of blades arranged on the periphery of the hub. The blades are evenly distributed and fixed on the fan hub. When the cooling fan is working, the fan hub drives the blades to rotate. The blades impact and cut the surrounding air to cause disturbance and generate airflow. In theory, the airflow flows parallel to the rotation axis of the fan. However, during the actual operation of the fan, part of the airflow flowing through the flow channel between the blades will be guided by the shape of the blades and flow out of the flow channel in a direction not parallel to the axis. The gas flow is relatively turbulent, and the airflow is easy to detach from the surface of the blades and generate a large amount of eddy turbulence. The generation of eddy turbulence will reduce the air flow through the fan, resulting in reduced air volume and poor heat dissipation efficiency, and will also cause noise and vibration problems. As the speed of the cooling fan increases, the closer to the outside of the blade, the easier it is for the airflow to have periodic eddy turbulence, and the more obvious the noise and vibration. Moreover, the speed of the fan is limited. If the speed is too high, the service life of the fan will be shortened, which is not worth the loss.

[0004] How to increase the air volume and reduce eddy current noise within a limited fan speed range is the current technical bottleneck. Therefore, it is urgent to develop a fan blade structure that can be applied to cooling fans and overcome the above defects. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a fan blade structure with multiple elevation angles, which includes:

[0006] The fan blade structure is composed of a plurality of blades with different elevation angles.

[0007] In the above-mentioned fan blade structure, the elevation angle of the blade decreases outward along the length direction of the fan blade structure.

[0008] The above-mentioned fan blade structure, wherein the tops of the blades are located on the same end surface.

[0009] In the above-mentioned fan blade structure, the plurality of blades are integrally formed.

[0010] In the above-mentioned fan blade structure, the connection between the blades with different elevation angles has a smooth portion.

[0011] The present invention also provides a heat dissipation device, comprising:

[0012] Wheel hub;

[0013] A plurality of fan blade structures are evenly mounted on the hub, and the fan blade structure is composed of a plurality of blades with different elevation angles.

[0014] In the above-mentioned heat dissipation device, the elevation angle of the blade decreases outward along the length direction of the fan blade structure.

[0015] In the above-mentioned heat dissipation device, the multiple blades of each fan blade structure are integrally formed.

[0016] The above-mentioned heat dissipation device, wherein the connection between the blades with different elevation angles has a smooth portion.

[0017] The above-mentioned heat dissipation device further includes an outer ring frame, and the outermost blades of the fan blade structure are connected to the outer ring frame.

[0018] In the above-mentioned heat dissipation device, the hub and the multiple fan blade structures are integrally formed; or the hub, the multiple fan blade structures and the outer ring frame are integrally formed.

[0019] Compared with the prior art, the effectiveness of the present invention lies in: based on the fan blade structure and heat dissipation device with multiple inclination angles of the present invention, by designing the fan blade structure into a combination of blades with multiple inclination angles, the fan blade structure can guide the gas flow at multiple angles, multiple directions, and multiple levels when rotating, reduce the phenomenon of airflow detaching from the fan blade surface, inhibit the formation of backflow on the fan blade surface that is opposite to the mainstream direction of the airflow, reduce the generation of eddy turbulence in the flow field, increase the air volume, improve the heat dissipation efficiency, and reduce eddy noise and vibration.

[0020] The above description of the content of the present invention and the following description of the embodiments are used to demonstrate and explain the principles of the present invention, and to provide a further explanation of the scope of the patent application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the fan blade structure with multiple elevation angles and the heat dissipation device of the present invention.

[0022] Figure 2 It is a schematic diagram of the airflow of the fan blade structure with multiple elevation angles and the heat dissipation device of the present invention.

[0023] Figure 3 It is a front view of the fan blade structure and heat dissipation device with multiple elevation angles of the present invention.

[0024] Figure 4 for Figure 3 AA cross-sectional schematic diagram, that is, the cross-sectional schematic diagram of the inner blade.

[0025] Figure 5 for Figure 3 BB cross-sectional diagram of , that is, the cross-sectional diagram of the outer blade.

[0026] Figure 6 It is a model schematic diagram of the simulation analysis result of the airflow direction of the present invention.

[0027] Figure 7 It is a wireframe schematic diagram of the simulation analysis result of the airflow direction of the present invention.

[0028] Wherein, the reference numerals are:

[0029] Wheels: 10;

[0030] Blade structure: 20;

[0031] Inner blade: 210

[0032] Outer blades: 220

[0033] Smoothing part: 230

[0034] Blade top end face: S1

[0035] Inner blade pitch angle: A1

[0036] Outer blade pitch angle: A2

[0037] Outer ring frame: 30 DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. In addition, elements / components with the same or similar reference numerals used in the drawings and embodiments are used to represent the same or similar parts.

[0040] The directional terms used in this document, such as up, down, left, right, front or back, etc., are only used to refer to the directions of the drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0041] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0042] As used herein, "and / or" includes any or all combinations of the items described.

[0043] As used herein, “plurality” includes “two” and “more than two”; as used herein, “plurality groups” includes “two groups” and “more than two groups”.

[0044] Certain terms used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present application.

[0045] See also Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the three-dimensional structure of the fan blade structure and the heat dissipation device with multiple elevation angles of the present invention. Figure 1 As shown, the fan blade structure and heat dissipation device with multiple elevation angles of the present invention include: a hub 10, a fan blade structure 20, an inner blade 210, an outer blade 220, a smooth portion 230, a blade top end surface S1, and an outer ring frame 30; wherein the fan blade structure 20 is mainly composed of an inner blade 210 and an outer blade 220 with different elevation angles; the tops of the inner blades 210 and the outer blades 220 are located on the same end surface S1, the inner blades 210 and the outer blades 220 are integrally formed, and a smooth portion 230 is provided at the connection between the two; a plurality of fan blade structures 20 are evenly mounted on the hub 10, and the outer blades 220 of the fan blade structures 20 are connected to the outer ring frame 30; the hub 10 and the plurality of fan blade structures 20 are integrally formed; or; the hub 10, the plurality of fan blade structures 20 and the outer ring frame 30 are integrally formed. The plurality of blades have a common top end surface S1, which makes the appearance of the fan blade structure composed of a plurality of blades with different elevation angles more neat and beautiful, facilitates the overall processing and manufacturing of the fan blade structure, and is also conducive to protecting the safety of operators during the production, transportation, and assembly of the fan blade structure. The smoothing portion 230 is used to connect the inner blade and the outer blade, so that the transition between the inner blade and the outer blade with different elevation angles is smoother.

[0046] It should be noted that in this embodiment, the fan blade structure includes an inner blade 210 and an outer blade 220, but the present invention is not limited thereto. In other embodiments, each fan blade structure may also include three or more blades with different inclination angles.

[0047] See also Figure 3-5 , Figure 3 This is a front view of the fan blade structure with multiple elevation angles and the heat dissipation device of the present invention. Figure 4 for Figure 3 AA cross-sectional schematic diagram, that is, a cross-sectional schematic diagram of the inner blade 210, Figure 5 for Figure 3 BB cross-sectional schematic diagram, that is, the cross-sectional schematic diagram of the outer blade 220. Figure 3-5 As shown, the elevation angle of the inner blade 210 is represented by A1, and the elevation angle of the outer blade 220 is represented by A2. The elevation angle A1 of the inner blade 210 is greater than the elevation angle A2 of the outer blade 220, that is, the elevation angles of the multiple different blades decrease outward in sequence along the length direction of the fan blade structure. Figure 3 The direction indicated by the middle arrow is the length direction of the fan blade structure.

[0048] See also Figure 2 , Figure 2 The figure is a schematic diagram of the airflow division of the fan blade structure and the heat dissipation device with multiple elevation angles of the present invention. The working principle of the fan blade structure is to apply the Bernoulli principle and utilize the elevation angle of the fan blade structure itself. When the fan blade rotates, a local vacuum is formed above the fan blade. Due to the pressure difference, the air above the fan blade is continuously sucked under the fan blade, generating air flow, forming a forced airflow, and achieving the effect of air supply. Figure 2 , 4 As shown in Figures 5 and 6, the fan blade structure and heat dissipation device of the present invention have multiple inclination angles. When the fan blade structure 20 rotates, the air above the fan blade structure 20 is sucked into the bottom of the fan blade structure along the blades 210 and 220 with multiple different inclination angles. Since the inclination angles A1 and A2 of the multiple blade surfaces are different, the airflow is guided to flow in multiple angles, directions and levels.

[0049] See also Figure 6-7 , Figure 6 is a model schematic diagram of the simulation analysis result of the airflow direction of the present invention, Figure 7 FIG. 1 is a wireframe schematic diagram of the simulation analysis result of the airflow direction of the present invention. Figure 6-7As shown, after the simulation analysis software simulates the gas flow of the fan flow field, the results show that the airflow direction of the inner blade is not consistent with the airflow direction of the outer blade, showing obvious airflow directions in two directions. It can be seen that the blades with different elevation angles on the fan can rectify the airflow in multiple angles, directions and levels; the elevation angles A1 and A2 of the multiple blades 210 and 220 of the present invention decrease from the inside to the outside along the length direction of the fan blade structure 20, reducing the airflow falling off the surface of the fan blade when the fan is working, inhibiting the backflow of the blade surface in the opposite direction of the mainstream airflow, and reducing the generation of eddy turbulence in the flow field, thereby increasing the air volume and improving the heat dissipation efficiency; the closer the blade is to the outside of the fan blade structure 20, the smaller the elevation angle of the blade, so that the eddy and eddy separation phenomena on the outside of the fan blade structure 20 are reduced, the gas pressure pulsation on the outside of the fan blade structure 20 is weakened, and the eddy noise and vibration phenomena are reduced.

[0050] To sum up, the fan blade structure and heat dissipation device with multiple inclination angles of the present invention have a simple structure, reasonable design and strong practicality; by designing the fan blade structure into a combination of blades with multiple inclination angles, the fan blade structure can guide the gas flow at multiple angles, multiple directions and multiple levels when rotating, reduce the phenomenon of airflow detaching from the fan blade surface, inhibit the generation of eddy turbulence in the flow field, increase the air volume, improve the heat dissipation efficiency, and reduce eddy noise and vibration.

[0051] Although the present invention is disclosed as above by the aforementioned embodiments, it is not intended to limit the present invention. Any relevant technician familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the patent protection scope of the present invention shall be subject to the protection scope of the claims attached to this specification.

Claims

1. A heat dissipation device, characterized in that: include: Wheel hub; A plurality of fan blade structures, wherein the plurality of fan blade structures are evenly mounted on the hub; Each of the fan blade structures is composed of a plurality of blades with different elevation angles, the elevation angles of the plurality of blades decrease outward in sequence along the length direction of the fan blade structure, and the tops of the plurality of blades are located on the same end surface, so that the fan blade structure has a leading edge with a common arc line and a plurality of trailing edges staggered from each other; wherein, The plurality of blades of each of the fan blade structures include an inner blade and an outer blade, the inner blade has an elevation angle A1, the outer blade has an elevation angle A2, and the elevation angle A1 of the inner blade is greater than the elevation angle A2 of the outer blade; An outer ring frame, to which the outermost blades of the fan blade structure are connected.

2. The heat dissipation device according to claim 1, characterized in that: The multiple blades of each fan blade structure are integrally formed.

3. The heat dissipation device according to claim 2, characterized in that: The connection between the blades with different elevation angles has a smooth portion.

4. The heat dissipation device according to claim 2, characterized in that: The wheel hub and the plurality of fan blade structures are integrally formed; or; the wheel hub, the plurality of fan blade structures and the outer ring frame are integrally formed.

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