Fan Wheel Stabilizing Structure for Noise and Bending Control
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Solution Overview
Problem
Motor vehicle radiator fans face challenges in achieving high air volume flow rates while minimizing noise and preventing fan blade bending and wear, especially at low vehicle speeds.
Innovation Solution
A fan wheel with a pot-shaped hub and inclined, curved fan blades featuring a stabilizing structure made of a dense material surrounded by a body of lower density material, which reduces weight and prevents bending, combined with an outer ring for improved sealing and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan wheel is rotated at a comparatively high rotation speed to achieve high air volume flow rate, then the air volume flow rate is improved, but air stream breaks off and high-frequency oscillations occur causing noise
Solution Approach 1:
The fan blades are designed with a curved geometry rather than straight edges. The curved shape of the fan blades smooths the air flow path, preventing air stream breakoff and reducing turbulence-induced noise while maintaining effective air movement at high rotation speeds
Solution Approach 2:
The patent optimizes the rotational speed parameters and blade geometry parameters to operate in a regime that achieves high air volume flow rate while staying below the thresholds that cause air stream breakoff and resonant oscillations, thereby reducing noise
2Productivity
If a comparatively large diameter of the fan wheel is selected to increase air volume flow rate, then the air volume flow rate is improved, but the fan blades are bent at the end reducing effectiveness and causing wear and noise
Solution Approach 1:
The fan blades are constructed as composite structures with an outer ring and internal reinforcement elements. This composite design provides structural rigidity to prevent blade bending while allowing the use of lighter materials that reduce rotational inertia and operational stress
Solution Approach 2:
The fan blade is divided into multiple structural components including an outer ring and internal reinforcement elements. This segmentation allows each component to be optimized for its specific function - the outer ring for aerodynamic performance and internal elements for structural support - preventing blade bending and wear
3Stability of the object's composition
If an outer ring is provided to surround and attach the fan blades to prevent bending, then the structural stability is improved, but a return flow of air is favored reducing the air volume flow rate
Solution Approach 1:
The outer ring is designed with differentiated local properties - it provides structural support and blade attachment at the blade roots where strength is needed, while featuring open sections or reduced density at the outer circumference to minimize interference with air flow and prevent return flow, thus maintaining high air volume flow rate
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 design enhances air volume flow rate, reduces noise, and prevents fan blade bending and wear, allowing for efficient cooling and reduced operational stress.
Implementation Method 1
each of the fan blades (32) has a stabilizing structure (40) made of a first material, wherein the stabilizing structure (40) is surrounded by means of a respective body (44) of a second material
Implementation Method 2
the fan wheel is suitable, in particular provided and configured to suck or blow air through a radiator of the motor vehicle
Data Source
AI summary
A fan wheel and a radiator of a motor vehicle, the fan wheel having a hub to which a number of fan blades is connected. The fan blades each have a stabilizing structure of a first material, which is surrounded by means of a respective body of a second material.