Impeller Blower Deflecting Crop Residue Radially
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Solution Overview
Problem
Existing agricultural combine designs face inefficiencies in the transition of harvested crop residue from the straw chopper to the impeller blower, with material being inadequately engaged due to parallel outlet and inlet planes, leading to material falling to the ground or being thrown towards the axis of rotation, resulting in poor delivery.
Innovation Solution
The solution involves arranging the straw chopper and impeller blower planes at an angle, with the impeller blades connected to a central cylindrical body that transitions into a conical shape, deflecting crop residue radially and ensuring engagement by the impeller blades, eliminating the need for a lower disk and improving material distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the outlet of the straw chopper and the inlet of the impeller blower are arranged in a single plane, then the structure is simple, but the material delivered at the circumference of the straw chopper is inadequately engaged by the impeller blower
Solution Approach 1:
The patent introduces a second circular disk positioned below the first disk, creating a two-dimensional arrangement of impeller blades. This vertical stacking of disks with blades extending in opposite rotational directions ensures that material falling from the straw chopper is engaged by blades from multiple levels, solving the engagement problem while maintaining structural efficiency
2Productivity
If a non orthogonal angle between the axis of rotation of the impeller blower and the plane of the outlet of the straw chopper is provided, then material flow is improved, but a considerable part of the harvested crop is thrown against the inner regions of the blades and towards the axis of rotation
Solution Approach 1:
The patent employs asymmetric blade configurations where blades on the first disk extend in one rotational direction while blades on the second disk extend in the opposite rotational direction. This asymmetric arrangement creates outward-directed forces that counteract the inward throwing of material toward the axis of rotation, while still maintaining effective material flow from the chopper outlet
3Productivity
If the impeller blades are arranged to engage material effectively, then material distribution is improved, but the device complexity increases
Solution Approach 1:
The patent merges two impeller blade systems into a single integrated assembly where the first and second circular disks are positioned vertically one above the other, with blades extending in opposite directions. This combined structure achieves comprehensive material engagement and distribution while consolidating what could have been separate complex systems into a unified, space-efficient configuration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the flow and distribution of harvested crop residue by deflecting it outward, preventing material from reaching the inner regions of the impeller blower and ensuring effective ejection across the field, improving the overall efficiency of crop residue handling.
Implementation Method 1
the impeller blades are brought into rotation by a drive element arranged above the cover plate... for the sake of unidirectional harvested crop transfer
Data Source
AI summary
A harvested crop residue chopper-and distribution arrangement for a combine (10) has a straw chopper (60) with an outlet (80) arranged in the plane of the outlet (96), with at least one impeller blower (82) arranged downstream of the outlet (80) of the straw chopper (60) with impeller blades (84) that can be rotated in the plane of the impeller blower (98) about an axis of rotation (88), where the plane of the impeller blower (98) may be inclined relative to the plane of the outlet (96). The impeller blades (84) may be connected with a central body (92) that is connected to a cone (94) facing the outlet (80) of the straw chopper (60).