An axial flow blade and an axial flow fan

Abstract

The invention belongs to the field of axial flow fans, and discloses an axial flow blade, the profile of which consists of a blade leading edge line (1), a blade pressure surface profile (2), a blade suction surface profile (3) and a blade trailing edge line (4) Composition, wherein the blade pressure surface profile (2) and the blade suction surface profile (3) are stacked and formed on the basis of the center arc arc (5) according to the preset airfoil thickness rule; and, The arc of the middle arc (5) changes from the root of the blade to the tip of the blade along the radial position of the fan according to the specific bending and torsion rules; among them, the blade placement angle of the arc of the middle arc on the blade cross section varies with the relative blade height of the blade cross section , the variation curve of the blade bending angle with the relative blade height of the blade section, all of which are constructed by the quadratic B-spline (B-spline) curve. The present invention controls the radial distribution of blade laying angle and blade bending angle along the blade radial direction through the quadratic B-Spline curve controlled by specific parameters, aiming at effectively improving the fan efficiency.

Description

technical field [0001] The invention belongs to the field of axial-flow fans, and more specifically relates to an axial-flow blade and an axial-flow fan. The axial-flow blade is a novel twisted axial-flow fan blade based on a novel bending and torsion law. Background technique [0002] As a general-purpose impeller machine, the new twisted axial flow fan blade is widely used in various ventilation and aerodynamic heat dissipation occasions. Its working characteristics include: the air flow flows into the impeller channel, the impeller makes the air flow obtain energy, and the top of the axial flow fan blade and There is a blade tip gap between the casings to avoid frictional collisions between moving and static parts. Under the action of the pressure difference between the suction surface and the pressure surface at the top of the blade, a part of the fluid crosses the tip clearance to form a tip clearance flow. Under the combined effect of the mainstream velocity, this leak...

AI Technical Summary

Problems solved by technology

The impeller designed with the law of equal reaction degree distortion has low reaction degree and small blade distortion, but the general efficiency is low, and the design performance parameters are quite different from the actual performance parameters.

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