Low-noise blower

Abstract

The invention relates to a low-noise blower which comprises a wind-generating device and a shell with the noise reduction function. The shell is in an interlayer structure comprising an inner shell and an outer shell, wherein the inner shell is made from a porous or cancellous plate, a sound-absorbing filler is filled between the inner shell and the outer shell, and the inner wall of the inner shell forms a sound-absorbing surface which forms a hollow cavity containing the wind-generating device and an airflow channel according to airflow organization. The structure is equivalent to the conversion of the blower shell into a muffler or the combination of the blower outer shell and the muffler. Because the sound-absorbing surface is close to a noise source, noise is absorbed before dispersed, and the effect is remarkable.

Description

technical field [0001] The invention relates to a fan, in particular to a fan with noise reduction technology. Background technique [0002] The fan is a commonly used equipment for ventilation, air induction, and blowing. Since the fan generates wind by the rotation of the fan blades to promote air flow, therefore, in the process of the fan blades pushing the air, the high-speed impact of the fan blades on the air will generate noise. The higher the speed of the fan, the greater the noise, and the larger the size of the fan blades, the greater the noise. Therefore, a high-power fan will produce a lot of noise, regardless of people's living environment or working environment. Large and small fans need to be installed, so if the noise of the fans is not eliminated, it will seriously affect the quality of life of nearby people. [0003] Fans in the prior art generally have three types: centrifugal type, axial flow type and mixed flow type (such as Figure 1~3 As shown), the s...

AI Technical Summary

Problems solved by technology

[0008] These technical solutions are to add devices outside the fan to reduce the noise transmitted from the fan to the outside from the outside of the fan, instead of starting from the part where the noise is generated to reduce the noise, and there is no different audio frequency and different volume for different parts. Different methods are used to eliminate the noise, which can only eliminate part of the noise and have little effect on the other part of the noise.

Even if the method of improving the machining precision of the fan blades is adopted, the effect is very limited, and after the fan has been running for a period of time, the impeller is stained with dust, the original precision and smoothness will be affected, and the noise will increase accordingly. Therefore, improving the machining accuracy is fundamental can't solve the problem

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