Fan blade taper testing method

Abstract

The invention provides a fan blade taper testing method and belongs to the combine harvester technical field. According to the fan blade taper testing method, a rotation shaft, fan blades and a fan covering plate are adopted; the rotation shaft is provided with a plurality of mounting plates along the radial direction of the rotation shaft; the fan blades are mounted on the mounting plates; tapered surfaces are formed on the fan blades; the fan covering plate is arranged outside the fan blades and includes a big end and a small end; the cross-sectional area of the big end is greater than the cross-sectional area of the small end; a rectangular air outlet is formed in the fan covering plate; two ends of the rotation shaft are supported at two ends of the fan covering plate; the rotation shaft drives the fan blades to rotate; the fan blades drive air to be discharged from the air outlet; the air leaves away from the tapered surfaces of the fan blades and generates transverse wind and horizontal wind; the calculation formula of the taper of the tapered surfaces of the fan blades is that alpha=180 degrees-(beta1+arcsin u1 sin beta1 / v1), wherein alpha is the taper of the end portions of the fan blades, u1 is the tangent velocity of the outer circumference of an impeller, v1 is the absolute velocity of the impeller when the air leaves away from the impeller, and beta1 is a structural angle. The fan blade taper testing method of the invention is high in cleaning quality and can reduce turbulence.

Description

technical field [0001] The invention belongs to the technical field of combine harvesters and relates to a method for testing the taper of fan blades. Background technique [0002] After the harvester finishes harvesting, the crops need to be cleaned. The crops enter from the right end of the axial flow drum and are discharged from the left end. The quantity of prolapsed matter that falls on the vibrating screen surface is distributed along the axial direction of the axial flow drum. The most, the left end of the discharge end is the least, and it basically declines linearly, so the cleaning load on the vibrating screen is uneven. The centrifugal fan is the core working part of the cleaning device. The fan shaft is parallel to the axis of the axial flow drum, and the fan width and vibration The sieve is equal in width, and the air outlet faces the entire sieve surface. Within the entire width range of the fan, the structural parameters such as the radius of the fan blade an...

AI Technical Summary

Problems solved by technology

But the opposite side of the cleaning object is different, so the air volume, wind pressure and wind speed in the location with a lot of cleaning objects are relatively small, and the cleaning is endless, while the location with few cleaning objects is too large, which not only increases the cleaning loss, but also increases the cleaning loss. Wind energy is also wasted, increasing energy consumption

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