Axial flow fan and crossflow fan structure for tip vortex reduction

摘要

The present invention relates to an axial flow fan and a vortex fan using a shroud, and in the related art, tip vortices are generated due to interference between the shroud and the blade tip during the rotation operation of the fan blade, which is a boundary layer thickness at the blade tip. As it increases, the vortex area in the blade tip increases, and the flow area smoothly decreases by the increased vortex area, thereby reducing the air volume and increasing noise.;Therefore, the present invention forms an embossed embossed and intaglio in the edge area of the blade tip to reduce the tip vortex generated in the blade tip to solve the above problems, while reducing the boundary layer thickness at the blade tip It is the axial fan and the vortex fan structure for reducing tip vortex to reduce the noise as well as increase the air volume by reducing the tip vortex area causing the flow resistance.