Noise Reduction Box Using Acoustic Interference
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Solution Overview
Problem
Existing noise reduction boxes in respirators either pose health risks due to fine particle generation or occupy excessive space, compromising patient safety and respirator design.
Innovation Solution
A noise reduction box design featuring a housing with interconnected first and second chambers, a blower, a partition with a through hole, and an integrated speaker and microphone system to counteract noise waves, eliminating the need for sound-absorbing cotton and reducing overall volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound-absorbing cotton is used in the noise reduction box, then noise reduction effect is achieved, but fine particles are generated causing health risks to patients
Solution Approach 1:
The patent removes the sound-absorbing cotton material from the noise reduction box structure. Instead of using traditional sound-absorbing materials that generate particles, the invention extracts this harmful component and replaces it with a particle-free noise reduction mechanism using acoustic chambers and wave interference.
Solution Approach 2:
The patent replaces the mechanical sound-absorbing cotton system with an acoustic field-based noise reduction system. This involves using acoustic chambers, partition walls with specific aperture arrangements, and active noise control elements that use sound wave interference to neutralize noise without generating particles.
2Object-affected harmful factors
If expansion chamber type noise reduction box is used, then noise reduction is achieved, but overall volume becomes large affecting respirator structural design
Solution Approach 1:
The patent divides the noise reduction function into multiple segmented acoustic chambers (first acoustic chamber, second acoustic chamber) separated by partition walls. This segmentation allows noise reduction to be achieved through distributed acoustic wave interference rather than requiring a single large expansion chamber, thus reducing overall volume.
Solution Approach 2:
The patent utilizes three-dimensional acoustic wave propagation and interference patterns within the chambers. By arranging partition walls and apertures in specific spatial configurations, the system achieves effective noise reduction through volumetric acoustic field manipulation rather than relying on simple expansion chamber volume.
3Object-affected harmful factors
If traditional noise reduction boxes are used, then noise reduction is provided, but patient health is threatened due to particle inhalation
Solution Approach 1:
The patent extracts and removes the sound-absorbing cotton material that generates harmful particles. The noise reduction function is maintained through alternative particle-free acoustic mechanisms, ensuring patient health safety while preserving noise reduction effectiveness.
Solution Approach 2:
The patent introduces acoustic wave interference as an intermediary mechanism between the noise source and the patient. Active noise control elements and acoustic chamber designs create counter-phase sound waves that neutralize noise without introducing particles, serving as a safe intermediary that protects patient health.
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 without generating harmful particles and minimizes space occupation, enhancing patient safety and respirator design efficiency.
Implementation Method 1
the speaker is used for generating a sound wave to counteract a noise wave of the blower
Implementation Method 2
the microphone is configured to capture a frequency of the noise of the blower, and transmit the frequency of the noise to the control chip
Implementation Method 3
the first chamber and the second chamber are connected to each other, and the air inlet and the air outlet are connected to the first chamber respectively
Data Source
AI summary
Disclosed are a noise reduction box and a respirator. The noise reduction box includes a housing and a blower. The housing includes a first chamber, a second chamber, an air inlet and an air outlet. The first chamber and the second chamber are connected to each other, and the air inlet and the air outlet are connected to the first chamber respectively. The blower is disposed in the first chamber, and includes an air intake connected to the second chamber and a tuyere connected to the air outlet.