Fan Silencing Device Using Phase Inversion Reflection Plate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing silencing devices for fans in electronic equipment are complex and costly, as they require separate speakers and complex control methods to reduce noise effectively.
Innovation Solution
A silencing device with a reflection plate positioned at a specific distance from the fan's rotation axis, inverting the phase of specific sound frequencies, and using a duct with air discharge slits to disperse air, reduces noise levels without increasing component count or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate speaker and complex control method are used to generate sound with phase inversion, then noise reduction is achieved, but device complexity and cost increase
Solution Approach 1:
The invention extracts only the essential function of noise cancellation (phase inversion) and implements it through a simple reflective plate structure, removing the need for complex control systems and separate speakers while maintaining the core noise reduction capability
Solution Approach 2:
The invention replaces expensive, complex active control systems with a simple, inexpensive reflective plate that achieves noise cancellation through passive acoustic reflection and phase inversion principles, significantly reducing cost and complexity
2Object-affected harmful factors
If a separate speaker is provided to generate sound with phase inversion, then noise reduction is achieved, but the number of components increases
Solution Approach 1:
The invention merges the noise cancellation function with the existing fan housing structure by integrating a reflective plate into the housing, eliminating the need for separate speakers and control components while achieving the same noise reduction effect
Solution Approach 2:
The reflective plate serves multiple functions: it acts as both a structural component of the housing and a noise cancellation device, while also serving as an air outlet, thereby reducing the total number of components needed in the system
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 levels by canceling out the loudest sound frequencies, achieving noise reduction with a simple configuration at a lower cost compared to existing solutions.
Implementation Method 1
The reflection plate is a member that inverts the phase of specific frequencies of the sound generated by the fan
Implementation Method 2
the reflection plate is disposed at a position a distance L from the center of the thickness of the fan, where L=(λ/2)×n. n is a natural number representing the number of compressions and rarefactions in a sound wave, and λ is the wavelength of the specific frequencies of the sound generated by the fan
Data Source
AI summary
A silencing device disposed to the outside of a fan 2 that discharges air from the interior of a device 1 to the outside. The silencing device includes a reflection plate 6 provided substantially normal to the rotation axis 2a of the fan 2, and a right-angled parallelepiped shaped duct 4 that guides air from the fan 2 to the outside of the device 1. The reflection plate 6 is disposed at the other end of the duct 4, an air discharge slit 7 is formed in at least one of the four sides of the reflection plate 6, and the distance from the fan 2 to the reflection plate 6 satisfies the relationship L=(λ/2)×n. n is a natural number, and λ is the wavelength of the maximum component from among the wavelength components that constitutes the sound generated by the fan 2.