Volute of centrifugal fan

Abstract

The invention relates to a volute of a centrifugal fan. The volute comprises a front cover plate, a rear cover plate and an annular middle ring wall. The front cover plate and the rear cover plate are connected together through a continuous smooth transition warp surface of the middle ring wall. The front cover plate and the rear cover plate are provided with front air inlet holes and rear air inlet holes respectively. The projection of the circle centers of the front air inlet holes in the plane of the rear cover plate coincides with the circle centers of the rear air inlet holes. The volute is characterized in that the edge outline of the front side of the middle ring wall is formed by connecting a straight line AB, a straight line BC, a curve CD, a curve DE, a curve EF, a curve FG, a curve GH, a curve HI, a curve IJ, a curve JK, a curve KL, a curve LM, a straight line MN, a straight line NO and a straight line OP which are sequentially in smooth transition, and the edge outline of the rear side of the middle ring wall is the same as the edge outline of the front side. Compared with the prior art, by means of the special design on the middle ring wall of the volute, the structure is more reasonable, the internal smoothness of the volute is improved, and the static pressure is increased; and meanwhile, the noise lowering effect is achieved, and the volute is suitable for the small size.

Description

technical field [0001] The invention relates to a centrifugal fan volute. Background technique [0002] The range hood is one of the essential kitchen appliances in the family. At present, European-style range hoods are favored by more and more consumers because of their neat and light appearance and small footprint. European-style range hoods generally include a fume collection hood, a fan body (intake box) located above the fume collection hood and perpendicular to it, a fan volute, an impeller, and a motor for driving the impeller are installed in the fan body, wherein the fan volute includes the front The cover plate, the rear cover plate and the ring-shaped intermediate ring wall connecting the two, the middle ring wall is usually perpendicular to the front cover plate and the rear cover plate except for the part connecting the volute tongue, the front cover plate has an air inlet, and the rear cover A motor bracket is arranged on the board, and the impeller is locate...

AI Technical Summary

Problems solved by technology

[0004] However, through experiments, it is found that the structure still needs to be further improved in reducing noise, increasing static pressure, air volume and efficiency, especially in certain specific sizes, the design of the above-mentioned curvature radii is still not ideal, and further optimization and improvement are needed

In addition, a curved panel protruding downwards and covering the middle housing is connected between the lower edge of the front cover and the lower edge of the rear cover. Although this structure can facilitate the smooth flow and diversion of oil fumes, Increased the volume of the entire fan volute, the design also needs further improvement

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