Double prerotation air intake guide blade of cross flow fan

Abstract

The invention relates to a double prerotation air intake guide blade of a cross flow fan, which belongs to the technical field of impeller machinery and comprises a positive prerotation guide blade group and a negative prerotation guide blade group, wherein the positive prerotation guide blade group comprises a plurality of air intake guide blades and the negative prerotation guide blade group comprises a plurality of air intake guide blades, the air intake guide blades of the positive prerotation guide blade group are sequentially arranged from to the end part of a volute of an air inlet of the cross flow fan to the center of the air inlet of the cross flow fan, and the air intake guide blades of the negative prerotation guide blade group are sequentially arranged from the end part of a volute tongue of the air inlet of the cross flow fan to the center of the air inlet of the cross flow fan. The invention can improve the local air intake condition of the cross flow fan and increase the operation efficiency of the cross flow fan as well as expand the stable operation working condition range of the cross flow fan, has simple structure, and can be conveniently arranged on various ventilated cross flow fans.

Description

technical field [0001] The invention relates to a guide vane in the technical field of turbomachinery, in particular to a double pre-rotation inlet guide vane of a cross-flow fan. Background technique [0002] The internal flow of the cross-flow fan is relatively complex and has the characteristics of uneven circumferential direction. When the impeller blades rotate to different circumferential positions, the work state is different. , will also cause large local losses due to poor flow conditions. [0003] After searching the existing relevant technical documents, it is found that the circumferential distribution of the incoming flow attack angle in the inlet area of ​​the cross flow fan is not uniform. Andrea Toffolo published "An Experimental Investigation of the Flow Field Pattem within the Impeller of a Cross-flow Fan" (inside the impeller of a cross-flow fan) in "Experimental Thermal and Fluid Science" (heat flow experimental science, 2004, 29: 53-64). Experimental r...

AI Technical Summary

Problems solved by technology

The incoming flow of some blades near the volute tongue in the inlet area has a relatively large negative angle of attack, and the flow between the blades tends to be blocked, while the incoming flow of some blades near the volute has a relatively large positive power angle, and flow separation occurs on the blade surface , only the blades in the middle are in the normal design condition, the flow conditions in the inlet area are unfavorable, the local loss is large, and the fan operation efficiency is low

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