Future Development Trend of Industrial Fans
Next, let's know what factors affect the efficiency of industrial fans, and hope that major manufacturers can find the direction of improvement.
Effect of Blade Shape of Industrial Large Fan
The shape of fan blade also has a great influence on fan efficiency. The shape of the fan blade directly affects the eddy current intensity near the blade, thus affecting the efficiency of the fan. Therefore, improving the shape of the blade, making it have better streamlined shape and suitable bending angle, is not only conducive to reducing eddy current noise, but also can greatly improve fan efficiency.
The influence of blade material
Experiments show that the blade material of the fan also has a certain influence on its noise.For example:The noise of cast aluminium blade is less than that of stamped steel blade, and that of nylon blade is less than that of metal blade. Generally speaking, the greater the material loss coefficient, the smaller the noise.
The influence of the number of leaves
Increasing the number of blades of the fan can increase the fan's volume under the condition of constant rotational speed. Or on the premise of obtaining the same volume of air, the speed of the fan can be reduced, thus reducing the noise of the fan. However, when the number of blades is more than 5, the increase of the number of blades is limited, and it often has a negative effect on noise reduction characteristics.
Effect of blade width
Under the same air volume, the noise sound pressure level of the low-speed wide-blade fan is 4 dB (A) lower than that of the high-speed narrow-blade fan, and the power consumption is reduced by 27%. Reduce the gap between the fan and the windshield, prevent the air flow disorder, and reduce the noise of the fan. The test results show that when the clearance is zero, the air volume increases by 27%, while the noise decreases by 3dB (A), and the air volume returns to the original level by reducing the rotational speed, and the noise can be reduced by 2dB (A).