Non-Circular Extractor Inlet for Sugarcane Harvester Airflow
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Solution Overview
Problem
Sugarcane harvesters face inefficiencies due to dead zones created by the mismatch between the output diameter of chopped billets and crop residue from the chopper assembly and the inlet diameter of the primary extractor, leading to suboptimal air flow and separation of debris.
Innovation Solution
The design of a primary extractor with a non-circular inlet opening and inclined nozzle walls, along with deflector plates, to improve air flow and enhance the separation of chopped billets and crop residue by minimizing dead zones and optimizing the air flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet diameter of the primary extractor is made larger to accommodate the crop material flow, then the extraction efficiency is improved, but dead zones are created where air flow bypasses the crop material
Solution Approach 1:
The patent changes the inlet opening from a circular shape to a non-circular shape that is elongated in the direction of crop material flow. This asymmetric configuration allows the inlet dimensions to better match the elongated flow pattern of chopped billets and residue, eliminating dead zones where air would otherwise bypass the material. The non-circular inlet ensures that air flow remains concentrated within the crop material stream while still accommodating the required flow width.
2Productivity
If the inlet opening is made larger to reduce dead zones, then air flow efficiency is improved, but the structural complexity of the extractor increases
Solution Approach 1:
The patent applies local quality by modifying only the inlet opening geometry rather than redesigning the entire extractor structure. The non-circular inlet opening is specifically shaped to match the crop material flow pattern, while the rest of the extractor maintains its conventional design. This localized modification achieves improved air flow efficiency without proportionally increasing overall structural complexity.
3Productivity
If the fan power is increased to improve separation, then the separation efficiency is improved, but the energy consumption increases
Solution Approach 1:
The patent changes the geometric parameters of the inlet opening from a circular configuration to a non-circular configuration that is elongated in the direction of crop material flow. This parameter change optimizes the air flow pattern and eliminates dead zones, improving separation efficiency without requiring increased fan power. The modified inlet geometry ensures that air flow is effectively utilized within the crop material stream.
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 efficiency of the extraction process by ensuring better airflow and effective separation of debris, potentially reducing the power requirements of the fan motor and improving overall harvesting efficiency.
Implementation Method 1
The primary extractor utilizes a fan or the like to separate the debris from the billets by passing the debris and billets through an air stream created by the fan. The air stream takes the lighter debris, such as sugarcane leaves or the like, among other crop residue, and moves the lighter debris through a hood of the extractor and out of the hood in a discharge direction.
Data Source
AI summary
A separator for a crop harvester configured to harvest sugarcane. The separator includes an extractor body that defines a chamber, the chamber extending through the extractor body and is in fluid communication with a cavity of a fan housing. The extractor body can generally define an inlet opening of the chamber, the inlet opening positioned to allow chopped billets and crop residue that are outputted from a chopper assembly to enter into the chamber. The inlet opening has a non-round, or non-circular configuration and/or cross sectional shape. Further, the inlet opening can have a width similar to a material flow width of the chopped billets and crop residue being outputted from the chopper assembly. Such a configuration can eliminate dead zones with respect to air flow that is to pull the chopped crop materials into the chamber and/or to separate crop residue from the chopped billets.