Asymmetric Vane Transition Device for Combine Harvester Crop Flow
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Solution Overview
Problem
Conventional threshing and separating systems face difficulties in managing compressed crop material efficiently due to the geometry of the transition cone, leading to increased crop pressure and reduced energy efficiency.
Innovation Solution
A transition device with a frusto-conical shape and vanes of unequal pitch, where the arc length between the first ends of adjacent vanes at the inlet is less than the arc length between the second ends at the outlet, allowing the crop material to expand and exit over a larger area, reducing compression and improving crop flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the transition cone uses uniformly spaced vanes with equal pitch, then the device structure is simple and easy to manufacture, but the crop material becomes compressed as it travels through the cone, leading to increased crop pressure and reduced energy efficiency
Solution Approach 1:
The patent applies asymmetry by configuring vanes with unequal pitch angles around the transition cone. Specifically, the vanes are arranged such that the arc length between adjacent vanes increases from the inlet to the outlet, creating an asymmetric distribution that allows crop material to expand rather than compress. This asymmetric vane arrangement resolves the contradiction by preventing crop compression (improving energy efficiency) while maintaining a relatively simple conical structure with uniformly spaced vanes in terms of physical positioning.
2Device complexity
If the transition cone narrows abruptly at the connection point, then the device structure is simple, but the crop material compression increases and flow control becomes difficult
Solution Approach 1:
The patent applies dynamics by creating a progressive narrowing effect through the asymmetric vane arrangement. Instead of an abrupt geometric change, the vanes are positioned to gradually guide and expand the crop material flow as it moves along the cone. This dynamic flow control approach allows the transition cone to maintain its simple frustoconical shape while achieving better crop material distribution and reduced compression through the clever positioning of vanes with increasing arc lengths between them.
3Quantity of substance
If the arc length between vanes decreases from inlet to outlet, then the crop material is compressed for better density, but the energy efficiency decreases and threshing performance suffers
Solution Approach 1:
The patent applies inversion by reversing the conventional approach to crop material compression. Instead of compressing material by decreasing the arc length between vanes from inlet to outlet, the design increases the arc length between adjacent vanes along the flow direction. This inverted approach allows crop material to expand naturally, maintaining density without excessive compression, thereby preserving energy efficiency and improving threshing performance through better material flow management.
Data Source
AI summary
A transition device for a combine harvester includes a body having an inlet end and an outlet end. A plurality of vanes are positioned on an interior facing surface of the body for guiding crop material through the transition device. Each vane has a first end positioned either on or adjacent the inlet end of the body and a second end positioned either on or adjacent the outlet end of the body. An arc length between the first ends of two adjacent vanes of the plurality of vanes is less than or equal to an arc length between the second ends of the two adjacent vanes of the plurality of vanes, such that the crop material can expand between the two adjacent vanes upon travelling along a trajectory from the inlet end to the outlet end of the transition device.