Coned Transition Section for Axial Rotor Housing

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Solution Overview

Problem

Existing rotary agricultural combines experience inefficiencies in energy consumption, increased wear, and straw damage due to abrupt transitions in the rotor housing, which do not enhance threshing capacity.

Innovation Solution

A rotor housing design with a smooth, frusto-conical transition section between the threshing and separating sections, where the gap between the rotor and housing gradually increases, reducing power consumption and wear while protecting crops.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If abrupt transitions in housing shape are used between rotor sections, then housing structure changes are simplified, but power consumption increases and wear increases

Engineering Contradiction:

Improvehousing structureVSAvoidpower consumption

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The patent applies a curved, frustoconical transition section between the threshing and separating sections of the rotor housing. This curved geometry gradually changes the housing shape rather than using abrupt steps, creating a smooth transition that reduces turbulence and energy loss in the crop material flow, thereby lowering power consumption while maintaining structural feasibility

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The transition section gradually changes the geometric parameters of the housing, specifically the radial distance from the rotor axis to the housing top. This gradual parameter change from the threshing section to the separating section avoids sudden expansions, reducing energy loss and improving flow efficiency

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If abrupt transitions in housing shape are used between rotor sections, then housing structure changes are simplified, but wear increases

Engineering Contradiction:

Improvehousing structureVSAvoidwear life

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The curved frustoconical transition section eliminates abrupt geometric discontinuities that create stress concentration points and turbulent flow patterns. The smooth curved surface distributes mechanical stresses more evenly and reduces turbulence-induced wear on the housing interior surfaces, thereby extending wear life and improving reliability

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Device complexity

If abrupt transitions in housing shape are used between rotor sections, then housing structure changes are simplified, but crop damage increases

Engineering Contradiction:

Improvehousing structureVSAvoidstraw damage

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The smooth curved transition section eliminates abrupt expansions that create turbulence and chaotic flow patterns. The gradual curved geometry guides crop material through the transition zone in a more controlled manner, reducing mechanical impact and turbulence-induced damage to straw and grain, thereby decreasing crop damage

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The gradual parameter change in the transition section avoids sudden expansions that would cause crop material to scatter and collide with housing surfaces. The progressive geometric transition maintains more uniform flow velocities and directions, protecting crop integrity

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If abrupt transitions in housing shape are used between rotor sections, then housing structure changes are simplified, but threshing capacity does not increase

Engineering Contradiction:

Improvehousing structureVSAvoidthreshing capacity

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The smooth curved transition section improves the overall efficiency of the rotor housing system by reducing energy losses and improving crop material flow. This enhanced efficiency allows the existing threshing capacity to be utilized more effectively, and the improved flow patterns can accommodate increased throughput without requiring additional threshing elements or rotor size

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS8021219B2Top cover for axial rotary combine having coned transition

Publication Date: 2011.09.20 DEERE & CO

AI summary

A threshing and separating mechanism for a combine includes an elongated rotor mounted for rotation about a rotor axis on the combine within a rotor housing. The rotor has a threshing portion and a separating portion. The housing has a threshing section and a separating section corresponding to the threshing portion and the separating portion. The housing surrounds the rotor and is spaced from the rotor to form an annular space between the rotor and the housing for crop material to flow through in an axial crop flow direction from an inlet end of the housing to an outlet end of the housing. The housing includes a smooth transition section between the threshing section and the separating section of the housing.