一种用于吸油烟机的离心风机蜗壳

Centrifugal fan volute for exhaust hood

Abstract

本发明公开了一种用于吸油烟机的离心风机蜗壳,包括前盖板、后盖板和出风口,所述前盖板上开设有进风孔,所述进风孔的中心为第一坐标原点,所述进风孔处设置有集流器,其特征在于:所述前盖板的下部、与出风口相应侧的位置形成有折弯部,所述折弯部朝向后盖板方向倾斜,所述集流器相对于第一坐标原点、向折弯部的方向偏心设置。通过在蜗壳左下角进行折弯,以及集流器向左下角进行偏移,改善左下角的流场波动,消弱了蜗壳的非对称性特性,调整叶轮周向进气,使得叶轮各流道叶片进气更加均匀,减少漩涡,从而起到降噪的目的。
The invention discloses a centrifugal fan volute for an exhaust hood, which comprises a front cover board, a rear cover board and an air outlet. An air inlet hole is formed on the front cover board; the center of the air inlet hole is a first coordinate origin; a flow collector is arranged at the position of the air inlet hole. The centrifugal fan volute is characterized in that a bent part is formed at a position at the lower part of the front cover board and at the side corresponding to the air outlet; the bent part is inclined towards the direction of the rear cover board; the flow collector is arranged eccentrically relative to the first coordinate origin towards the direction of the bent part. By carrying out bending on the bottom left corner of the volute and shifting the flow collector towards the bottom left corner, flow field fluctuation of the bottom left corner is improved, the asymmetry characteristic of the volute is weakened, peripheral air entrance of an impeller is regulated, air entrance of each flow passage of the impeller is more uniform, and vortexes are reduced, so that the aim of reducing noise is fulfilled.

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