Variable Cross-Section Transition Cone Vanes Reduce Recirculation
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Solution Overview
Problem
Existing transition cone vanes in combine harvesters experience wear and crop recirculation due to the geometry of the vanes, leading to inefficiencies in crop material transport and increased wear on the inner surface.
Innovation Solution
The vanes are designed with a radial protrusion that changes orientation along the axial direction, featuring a base mounting surface and a projecting segment with a downstream-facing side perpendicular to the cone ends, improving crop material flow into the rotor cage and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional angle-iron vanes are used in the transition cone, then the vanes can be easily manufactured and installed, but crop material recirculates around the cone and wear occurs on the inner surface
Solution Approach 1:
The vane cross-sectional shape changes along its length to optimize performance at different locations. The upstream portion has a different cross-section than the downstream portion, allowing each section to be optimized for its specific function in guiding crop material through the transition cone.
Solution Approach 2:
The vane design incorporates varying cross-sectional geometry along its length, transitioning from one shape at the upstream end to another shape at the downstream end. This dynamic variation in geometry allows the vane to adapt to changing flow conditions and crop material characteristics along the transition cone.
2Productivity
If the transition cone narrows along its length, then crop material is directed into the rotor cage, but wear occurs on the inner surface downstream from the vanes
Solution Approach 1:
The vane cross-sectional shape varies along its length to address different functional requirements at different locations. This local optimization reduces unwanted crop recirculation and minimizes wear on the transition cone inner surface while maintaining effective crop material transport.
3Ease of operation
If helical vanes are provided on the transition cone, then crop material transport is facilitated, but crop recirculation occurs due to vane geometry
Solution Approach 1:
The vane cross-sectional geometry changes along its length, with the upstream portion having different dimensions and shape characteristics than the downstream portion. This allows optimization of crop material flow at each location while preventing recirculation that would waste energy.
Solution Approach 2:
The vane design incorporates changes in cross-sectional parameters (shape, size, orientation) along its length. This parameter variation optimizes the vane's interaction with crop material at different positions in the transition cone, improving flow efficiency and reducing recirculation.
Data Source
AI summary
An agricultural harvester includes a threshing system having a rotor, a rotor cage surrounding the rotor and including a concave, and a transition cone defining an infeed to the rotor cage. The transition cone has a conical inner surface extending in an axial direction between an upstream end and a downstream end of the cone. A vane is mounted to the conical inner surface of the transition cone. The vane protrudes radially from the conical inner surface, and extends along an axial direction between the upstream end and the downstream end. The vane has a body extending along an axis and a cross-sectional shape that is not constant along the axis.