Efficient noise elimination structure for fan

Abstract

The invention discloses an efficient noise elimination structure for a fan. The structure comprises side plates fixed to a fan, telescopic plates fixedly connected to the side plates, middle plates fixedly connected to the telescopic plates, a plurality of reciprocating structures arranged above the middle plates, a telescopic structure fixedly arranged above the side plates and used for driving the reciprocating structures to move so that the middle plates and the side plates can get close to each other, a control structure arranged on the two side plates, and a locking structure connected to the control structure and used for locking the middle plates and the side plates. Rhombic grooves and guide grooves are formed so that the ventilation quantity and the noise suppressing effect are better improved; the locking structure is arranged so that the side plates and the middle plates are better fixed together, better usage is realized, and the usage stability is improved; and the reciprocating structures are arranged so that accumulated dust in the guide grooves is better cleaned, and the noise suppressing effect is better.

Description

technical field [0001] The invention belongs to the technical field of fan mufflers, and in particular relates to a high-efficiency noise reduction structure for a fan. Background technique [0002] The existing mufflers mainly open through holes on the windward section, and then the wind passes through these through holes to achieve the sound attenuation effect. However, due to the machining technology, the existing mufflers mainly change the shape of the through holes. Thereby increasing the area of ​​air circulation, reducing the flow velocity of air flow inside the muffler, reducing the resistance of the muffler per unit length to the ventilation system; increasing the contact area between the air flow inside the muffler and the muffler cavity, thereby improving the muffler per unit length. Noise reduction; this method cannot fundamentally solve the problem of the muffler. The muffler still has a large volume. The essence of the special-shaped through hole is to accommod...

AI Technical Summary

Problems solved by technology

[0002] The existing mufflers mainly open through holes on the windward section, and then the wind passes through these through holes to achieve the sound attenuation effect. However, due to the machining technology, the existing mufflers mainly change the shape of the through holes. Thereby increasing the area of ​​air circulation, reducing the flow velocity of air flow inside the muffler, reducing the resistance of the muffler per unit length to the ventilation system; increasing the contact area between the air flow inside the muffler and the muffler cavity, thereby improving the muffler per unit length. Noise reduction; this method cannot fundamentally solve the problem of the muffler. The muffler still has a large volume. The essence of the special-shaped through hole is to accommodate more through holes on the same surface. The noise reduction effect of the muffler mainly depends on the size of the windward side of the muffler. Although the noise reduction effect is improved, it is linked to the volume of the muffler;

[0003] There are many ways to reduce the flow velocity of the wind in the through hole, the simplest is to open a cavity in the through hole, so that when the wind passes through the through hole, there will be cross sections of different sizes at different positions, so that the wind can be reduced. The flow speed in the through hole, but it is difficult to process the cavity in the through hole, which will lead to high cost, resulting in a disproportionate effect of noise reduction and cost, and cannot be put into production

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