A silent fan

Abstract

The invention discloses a mute fan. The mute fan comprises a fan main body, wherein an air inlet is formed in one side of the fan main body; the fan main body is hollow; an air chamber is formed in the fan main body; the hollow part of the fan main body surrounds the outside of the air chamber; the air inlet is provided with a sound absorbing piece and a top cover; the top cover is arranged at one end, which is away from the fan main body, of the air inlet; a projection part is formed in the middle of the side, which is close to the fan main body, of the top cover; a conical surface is formed on the periphery of the projection part; a first extension part is formed at the edge, which is positioned on the outer side of the air inlet, of the top cover; one end, which is close to the fan main body, of the sound absorbing piece surrounds the inner side of the air inlet; the other end, which is away from the fan main body, of the sound absorbing piece surrounds the inner side of the top cover; the diameter of the conical surface is gradually increased from one end which is close to the fan main body to the other end which is away from the fan main body; and the first extension part is gradually inclined to the direction close to the sound absorbing piece from one end which is close to the fan main body to the other end which is away from the fan main body. The mute fan is good in noise reduction property.

Description

technical field [0001] The invention relates to the technical field of fans, in particular to a silent fan. Background technique [0002] During the operation of a general centrifugal fan, a high-speed impeller is installed at the air inlet of the main body of the fan, and the air is pumped through the impeller. However, due to the intense friction between the impeller and the air, it will generate a lot of noise, resulting in most of the fans on the market. It will produce a lot of noise during work, and cannot be used in environments that require high quietness. In order to realize the mute effect, structures such as sound-proof cotton are generally arranged directly on the existing fan casing in the current industry, but the sound-proof effect is not good. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a silent fan, which can improve the quiet performance of the fan. [0004...

AI Technical Summary

Problems solved by technology

[0002] During the operation of a general centrifugal fan, a high-speed impeller is installed at the air inlet of the main body of the fan, and the air is pumped through the impeller. However, due to the intense friction between the impeller and the air, it will generate a lot of noise, resulting in most of the fans on the market. It will produce a lot of noise when working, so it cannot be used in environments that require high quietness

In order to achieve the mute effect, the current industry generally installs structures such as sound insulation cotton directly on the existing fan casing, but the sound insulation effect is not good

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