Cooling Fan Reverse Flow Guide De-spinning
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Solution Overview
Problem
Current cooling fan modules for motor vehicles generate high noise due to swirling gap flows, which negatively impact comfort and flow behavior, as the swirling reverse flow works against the main flow.
Innovation Solution
A cooling fan module with a reverse flow guide device comprising an inner and outer ring, and air guide fins that de-spin and mix the reverse flow with the main flow, eliminating swirl and improving flow behavior and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional cooling fan module is used, then the structure is simple and manufacturing is easy, but the swirling gap flow generates high noise and deteriorates flow behavior
Solution Approach 1:
An annular reverse flow guide device is introduced as an intermediary component between the fan impeller and the frame. This device includes guide surfaces that actively redirect the swirling reverse flow, mixing it with the main flow to reduce turbulence and noise while maintaining structural feasibility
Solution Approach 2:
The reverse flow guide device extracts and separates the harmful swirling reverse flow from the main cooling flow. By providing a dedicated pathway and guide surfaces, the device removes the detrimental rotational component before it can interfere with the main flow, thereby reducing noise without significantly complicating the overall structure
2Productivity
If the gap flow is allowed to form naturally, then the structure remains simple, but the reverse flow swirls and works against the main flow, reducing cooling effectiveness
Solution Approach 1:
The reverse flow guide device acts as a mediator that intercepts the swirling reverse flow and redirects it through guide surfaces. This intervention prevents the reverse flow from working against the main flow, thereby improving cooling effectiveness while adding only a single annular component
Solution Approach 2:
The guide surfaces in the reverse flow guide device perform preliminary action by redirecting and straightening the reverse flow before it can significantly interfere with the main cooling flow. This proactive flow management ensures that the main flow remains vortex-free and maintains high cooling effectiveness
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 results in a vortex-free flow reaching the fan blades, reducing noise and enhancing the effectiveness of the cooling fan module by improving flow behavior and noise reduction.
Implementation Method 1
an annular reverse flow guide device which comprises an inner ring and an outer ring and which is designed to de-spin a reverse flow between the inner ring and the outer ring and to mix said reverse flow with the gap flow
Implementation Method 2
The reverse flow guide device rectifies the reverse flow again so that this no longer swirls, and mixes said reverse flow with the flow which flows between the inner ring of the reverse flow guide device and the fan impeller outer ring
Data Source
AI summary
The invention relates to a cooling fan module for a motor vehicle, having a fan impeller which has a multiplicity of fan impeller blades which are connected to one another via a fan impeller outer ring, having a frame, on which the fan impeller is mounted, having an annular reverse flow guide device, which has an inner ring and an outer ring and which is designed to de-spin a reverse flow between the inner ring and the outer ring and to mix said reverse flow with the slot flow between inner ring and fan impeller outer ring.