Patent Application
20220120284
This application relates to a fan blade and a fabricating method thereof, and particularly relates to a fan blade having a rough coating layer on its surface and a fabricating method thereof.
As science and technology constantly advance, various electronic products are developing faster. Among them, for example, mobile phones, head-mounted display devices, etc., generate relatively more heat during operation since their functions are powerful. Therefore, how to improve heat dissipation efficiency of electronic devices to maintain normal operation and prevent users from experiencing a high temperature is an important direction for research and development.
This application provides a fan blade and a fabricating method thereof, which may solve the problem of poor heat dissipation efficiency of electronic devices.
The fan blade of this application includes a rough coating layer on its surface. The rough coating layer includes a plurality of recessed regions. A maximum depth of recess of the recessed regions is between 50 micrometers (μm) and 130 μm.
A fabricating method of a fan blade of this application includes the following steps. A fan blade is provided. A rough coating layer is formed on a surface of the fan blade. The rough coating layer is formed to include a plurality of recessed regions. A maximum depth of recess of the recessed regions is between 50 μm and 130 μm.
Based on the foregoing, in the fan blade and the fabricating method thereof in this application, the heat dissipation efficiency may be improved due to the rough coating layer on the surface.
The rough coating layer 130 allows the air flowing through the surface S10 of the fan blade 100 to form a turbulent boundary layer in close contact with the surface S10, so that the airflow outside the turbulent boundary layer travels backward slightly further along the surface S10 of the fan blade 100 to reduce the range of the wake flow that causes a drag force. In this way, parameters such as a flow rate and a wind pressure generated by the fan blade 100 can be increased, and noise volume generated can be reduced.
In this embodiment, an arithmetic mean roughness (Ra) of the rough coating layer 130 is between 1.9 μm and 5.9 μm, but this application is not limited thereto.
In this embodiment, an average depth of recess of the recessed regions 132 is between 35 μm and 65 μm, but this application is not limited thereto.
In an embodiment of this application, the method of forming a rough coating layer includes the following steps. For example, the surface of the fan blade 100 is cleaned up first, step S14. Next, a conductive liquid is sprayed on the surface of the fan blade 100, step S16. Afterward, the fan blade 100 after sprayed with the conductive liquid is left to stand at room temperature for about 30 minutes, step S18. Then, the fan blade 100 after sprayed with the conductive liquid and standing at room temperature is hung, and powder spraying is performed on the surface of the fan blade 100, step S20. The spraying temperature is about 200° C., and the spraying time is about 30 minutes. Afterward, the fan blade 100 after powder spraying is cooled, step S22. The material of the sprayed powder includes, for example, polyester and epoxy resin, and the particle size thereof is, for example, between 30 μm and 34 μm. The powder coating technology is more environmentally friendly, and the material utilization rate is better.
In this embodiment, the maximum depth of recess D10 of the recessed regions 132 is greater than 10% of a thickness D20 of the fan blade.
Table 1 below lists the results obtained by adopting a fan with a rough coating layer according to an embodiment of this application and a conventional fan without a rough coating layer for test. Between them, the diameter of the fan is 36 mm, the thickness of the fan blade is 0.3 mm, and the overall thickness of the fan is 5.5 mm. The unit of flow rate is CMF (cubic foot per minute), the unit of wind pressure is millimeter-water column (mm-Aq), and the unit of noise is dB. In the tests of No. A and No. B, the rotation speed of the fan is the same, and the rotation speed of the fan of No. C is higher. As can be seen from Table 1, when the rotation speed of the fan is the same, greater flow rate and wind pressure are generated by the fan with the rough coating layer than by the fan without the rough coating layer, and less noise is generated by the fan with the rough coating layer than by the fan without the rough coating layer. Besides, in the experiments No. A and No. C, the noise generated by the fan with the rough coating layer is similar to the noise generated by the fan without the rough coating layer, the flow rate generated by the fan with the rough coating layer can be increased by 7% compared with the flow rate generated by the fan without the rough coating layer, and the wind pressure also shows an 11.7% increase.
In summary of the foregoing, in the fan blade and the fabricating method thereof in this application, the rough coating layer results in the plurality of recessed regions on the surface of the fan blade, thus reducing the drag force experienced during operation. In this way, the flow rate and the wind pressure generated by the fan blade can both be increased to improve the heat dissipation efficiency, and the noise volume generated can also be reduced.
