Tangential Extractor Fan Positioning for Unobstructed Debris Flow

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Solution Overview

Problem

Conventional agricultural harvesters face obstruction in debris removal due to axial flow extractor fans that occupy significant space within the airflow channel, hindering the flow of debris through the extractor.

Innovation Solution

A debris removal system with flow-generating devices positioned around the outer perimeter of the extractor, creating a suction force that draws debris into the extractor without obstructing the central airflow path, allowing for an unobstructed flow path through the extractor housing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If axial flow extractor fans are positioned in-line with the debris flow through the extractor, then debris removal capability is improved, but the flow path through the extractor becomes obstructed

Engineering Contradiction:

Improvedebris removal capabilityVSAvoidflow path obstruction

Core Design Contradiction:

ProductivityVSArea of stationary object

Solution Approach 1:

The fan assembly is repositioned from an in-line axial position to a tangential position at the extractor inlet, changing the spatial dimension of airflow generation. This allows the fan to draw debris into the extractor without the fan blades obstructing the central flow path through the extractor housing.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

A housing structure is introduced as an intermediary component that directs the tangential airflow from the fan assembly into the extractor. This housing mediates between the fan's tangential airflow and the extractor's vertical flow path, enabling effective debris removal without direct obstruction.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Force

If a large fan hub with radially extending blades is used in the extractor, then suction force for debris removal is improved, but space within the airflow channel is occupied

Engineering Contradiction:

Improvesuction forceVSAvoidspace occupation in airflow channel

Core Design Contradiction:

ForceVSVolume of stationary object

Solution Approach 1:

The fan assembly is extracted from the interior of the extractor housing and repositioned at the inlet. This removes the large fan hub and blades from the airflow channel, eliminating their obstruction to the flow path while maintaining their suction function through the housing's airflow channel.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The fan assembly operates in a different spatial plane (tangential at the inlet) rather than within the extractor's vertical flow channel. This dimensional separation allows the fan to generate sufficient suction force without occupying space within the airflow channel.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Area of stationary object

If flow-generating devices are positioned around the outer perimeter of the extractor, then the central flow path remains unobstructed, but debris suction capability must be maintained

Engineering Contradiction:

Improvecentral flow path clearanceVSAvoiddebris suction capability

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The housing structure incorporates a specifically designed airflow channel that concentrates and directs the tangential airflow from the perimeter fan assembly into the extractor. This local structural quality ensures that despite the fan's peripheral position, sufficient suction capability is maintained through optimized airflow guidance.

Inventive Principle:

Principle #3Local quality

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

The system effectively removes debris from harvested crops without inhibiting the airflow, maintaining a large unobstructed flow path and improving the efficiency of debris extraction in agricultural harvesters.

Implementation Method 1

the airflow creates a negative pressure at the extractor inlet that draws the debris into the extractor housing

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 2

generate a suction force for removing debris without inhibiting the central flow path through the extractor

Methodology Applied

Scientific EffectSuction force: Suction

Data Source

PatentUS10492370B2Debris removal system for an agricultural harvester with improved debris flow and related extractors

Publication Date: 2019.12.03 BLUE LEAF I P INC

AI summary

An extractor may include an extractor housing extending from an inlet to an outlet. The housing may define an airflow channel for directing debris through the extractor from the inlet to the outlet, with the housing forming an outer perimeter of the extractor. The extractor may also include at least one flow-generating device configured to generate an airflow directed through the airflow channel that creates a negative pressure at the inlet to draw debris into the housing. In addition, the flow-generating device(s) may be positioned adjacent to the housing along the outer perimeter of the extractor such that a central flow region is defined within the airflow channel at the location of the flow-generating device(s) that extends from a center of the housing radially outwardly towards the outer perimeter of the extractor, with the central flow region defining an unobstructed flow path for the debris through the housing.