Oval Ribs on Vehicle Fan Protection Grid
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Solution Overview
Problem
Vehicle heat exchanger fans often generate excessive noise and are vulnerable to damage from debris, which complicates airflow and noise management.
Innovation Solution
A fan design featuring a protection grid with radial and concentric ribs of specific dimensions and shapes, including oval and crescent cross-sections, aligned to minimize noise and protect the fan from debris, while improving airflow to the heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fan is provided upstream of the heat exchanger to create or increase air flow, then the air flow to the heat exchanger is improved, but the noise generation increases
Solution Approach 1:
A protection grid is introduced as an intermediary component between the environment and the fan. The grid includes ribs with specific oval cross-sections that are inclined at angles between 30° and 60° relative to the radial direction. This intermediary structure protects the fan from debris while the inclined rib configuration is specifically designed to reduce noise generation by optimizing airflow patterns, thus resolving the contradiction between improving air flow and reducing noise.
Solution Approach 2:
The ribs of the protection grid are designed with specific geometric parameters: oval cross-sections with defined width and height ratios, and inclination angles between 30° and 60° from the radial direction. These parameter optimizations are specifically tailored to reduce noise generation while maintaining protective function and airflow efficiency, addressing the noise problem without sacrificing the air flow improvement provided by the fan.
2Reliability
If a protection grid is added to protect the fan from stones and objects, then the reliability is improved, but the noise generation may increase
Solution Approach 1:
The protection grid ribs are designed with optimized parameters including oval cross-sections with specific width (4.0-4.2 mm) and height (6.0-6.4 mm) dimensions, and inclination angles between 30° and 60° from the radial direction. These parameter optimizations reduce noise generation by minimizing turbulence and airflow disruption, while still providing effective protection against debris, thus resolving the contradiction between reliability and noise.
Solution Approach 2:
The ribs are designed with asymmetric oval cross-sections where the width and height are deliberately differentiated (width: 4.0-4.2 mm, height: 6.0-6.4 mm). This asymmetric configuration optimizes the airflow patterns to reduce noise generation while maintaining the structural integrity and protective function of the grid, addressing the noise problem without compromising reliability.
3Object-generated harmful factors
If the protection grid ribs are designed with specific dimensions and shapes, then the noise generation is reduced, but the manufacturing complexity increases
Solution Approach 1:
The ribs are designed with standardizable parameters (oval cross-sections with width 4.0-4.2 mm and height 6.0-6.4 mm, and inclination angles of 30°-60°) that can be efficiently manufactured using conventional molding or fabrication processes. These standardized parameter ranges make the complex geometry manageable for manufacturing while still achieving the noise reduction benefits, balancing manufacturing ease with noise control performance.
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 solution effectively reduces noise generation and protects the fan from damage, maintaining acceptable noise levels and enhancing airflow efficiency.
Implementation Method 1
an oval cross-section is preferred for at least one rib, in particular one radial rib, but preferably all radial and also concentric ribs. In particular, it can be aligned favorably in terms of flow if a longitudinal axis of the oval extends essentially in the flow direction
Implementation Method 2
a fan is provided upstream thereof which essentially creates the air flow in the direction of the heat exchanger
Data Source
AI summary
A fan for a heat exchanger of a vehicle includes a ventilator and a protection grid upstream of the ventilator. The protection grid may include a plurality of radial and/or concentric ribs, wherein at least one rib, in particular a radial one, may have an oval cross-section. A longitudinal axis of the oval may have an angle with respect to the flow direction.