Fan Frame Noise Muffling Structure
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Solution Overview
Problem
Cooling fans produce unpleasant broadband noise due to frame vibration and air flow collisions, which existing designs fail to effectively mitigate.
Innovation Solution
A fan frame with a noise muffling structure featuring a hollow cavity noise muffling unit located between the top and bottom of the frame, isolated from the air flow passage, which absorbs frame vibration and reduces noise through its closed hollow cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling fan operates to achieve heat dissipation, then cooling effect is improved, but broadband noise increases due to frame vibration and air flow collision
Solution Approach 1:
The patent introduces a noise muffling unit as an intermediary structure between the air flow passage and the frame. This unit includes a noise muffling hole with a hollow cavity that acts as a mediator to absorb vibration energy and reduce noise transmission, while still allowing the cooling fan to operate effectively for heat dissipation.
Solution Approach 2:
The patent changes the physical parameters of the frame structure by adding the noise muffling unit with specific geometric parameters (hole diameter, cavity depth, positioning). This structural parameter change enables the frame to absorb vibrations and reduce noise while maintaining its cooling function.
2Object-generated harmful factors
If noise muffling unit is added to reduce broadband noise, then noise reduction is improved, but frame structure complexity increases
Solution Approach 1:
The noise reduction function is segmented from the main frame structure and implemented through a separate noise muffling unit. This segmentation allows the noise control function to be added independently without fundamentally redesigning the entire frame structure, thus limiting the increase in overall complexity.
Solution Approach 2:
Instead of modifying the entire frame structure, the patent applies the noise muffling unit locally at specific positions where noise generation is most prominent. The noise muffling hole is positioned between the air flow passage and the frame outer periphery, targeting the specific source of broadband noise without unnecessary structural changes elsewhere.
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
Significantly reduces broadband noise levels by isolating and absorbing frame vibrations, achieving a sound pressure level 1.44 dB lower than prior art designs.
Implementation Method 1
the hollow cavity of the noise muffling unit is closed in between the top and the bottom of the frame, it can effectively isolate noise, absorb frame vibration and reduce the broadband noise produced by the frame vibration
Data Source
AI summary
A fan frame with noise muffling structure includes a frame having a top and a bottom and defining a centered air flow passage that extends from the top to the bottom. The air flow passage has an air inlet and an air outlet formed on the top and the bottom, respectively. The frame further has a noise muffling zone in at least one area of the frame located between the air flow passage and an outer periphery of the frame. In the noise muffling zone, there is provided at least one noise muffling unit, which is located between the top and the bottom without communicating with the air flow passage. The noise muffling unit internally defines a hollow cavity, which is closed between but not extended through the top and the bottom. The hollow cavity isolates air flow noise and absorbs frame vibration and noise produced by the frame vibration.