Fan Assembly Inlet Ring Design for Combine Harvester Air Intake
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Solution Overview
Problem
The existing fan assemblies for combine harvesters face challenges in air intake due to the limited diameter of the fan rotor, which restricts the aerodynamic performance when trying to maintain a balance between rotor size and air inlet diameter.
Innovation Solution
The proposed fan assembly incorporates an inlet ring that extends radially inward from the air inlet opening, and a retaining ring with elevations that are connected to the inlet ring using insertable retaining elements, allowing for a secure and efficient assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the fan rotor diameter is increased to improve air intake, then the air intake performance is improved, but the rotor cannot be installed through the limited diameter air inlet opening of the housing
Solution Approach 1:
The housing is divided into two separate parts: the main housing body and the inlet ring that can be mounted afterward. This segmentation allows the rotor to be installed through the opening first, then the inlet ring is attached to extend the air intake area without requiring the rotor to pass through a larger opening.
Solution Approach 2:
The rotor is installed preliminary through the air inlet opening before the inlet ring is mounted. This preliminary installation allows the rotor to be positioned correctly, after which the inlet ring is attached to extend the air intake area without interfering with the rotor installation process.
2Quantity of substance
If separate inlet rings are mounted after fan rotor installation to extend air intake, then the air intake is improved, but the assembly process becomes more complex with additional components
Solution Approach 1:
The inlet ring is merged with the retaining ring structure, combining two functions (extending air intake and securing the rotor) into a single integrated component. This reduces the number of separate parts and simplifies the assembly process while maintaining the extended air intake capability.
Solution Approach 2:
The inlet ring serves multiple functions: it extends the air intake area, provides mounting positions for retaining elements, and works with the retaining ring to secure the rotor assembly. This multi-functionality reduces the need for separate components.
3Reliability
If inlet rings are fastened with screws into retainers anchored in the housing, then the inlet ring is securely fixed, but the assembly time and manufacturing complexity increase
Solution Approach 1:
The complex multi-component fastening system (screws, retainers, anchoring features) is extracted and replaced with a simpler retaining ring structure that uses elastic retaining elements. This extraction of unnecessary complexity reduces assembly steps while maintaining secure fixation.
Solution Approach 2:
The elastic retaining elements automatically engage with the inlet ring and housing features when the retaining ring is installed, providing self-fixing capability without requiring manual screw tightening or complex anchoring procedures. The elastic nature provides automatic tension and secure fixation.
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 aerodynamic properties of the fan assembly by optimizing the air intake while simplifying the assembly process by reducing the number of components and time required for mounting.
Implementation Method 1
A fan assembly comprises a housing, in which a fan rotor is arranged for rotation about a horizontal axis extending transversely to the forward direction of the combine harvester
Implementation Method 2
An inlet ring extends radially inward from the air inlet opening of the housing
Implementation Method 3
The retaining ring is fastened to the housing, such that the inlet ring is attached to the face of the retaining ring spaced apart from the housing
Data Source
AI summary
A fan assembly for a cleaning device of a combine harvester includes a fan rotor, a housing which accommodates the fan rotor and defines an air inlet opening through which the fan rotor is inserted during assembly, and an inlet ring, which extends radially inward from the air inlet opening of the housing. A retaining ring is fastened to the housing and is equipped with elevations distributed around its circumference. The inlet ring is attached to the retaining ring and is provided with elevations, which are complementary to and abut the elevations of the retaining ring. The retaining ring and the inlet ring are connected to one another at their respective elevations by insertable retaining elements extending through coaxial openings in the elevations.