Portable Oxygen Concentrator Noise Reduction via Nested Housing
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Solution Overview
Problem
Portable oxygen concentrators face challenges in miniaturization, noise reduction, vibration mitigation, durability, and ease of repair, failing to meet user and equipment provider needs due to size, loud operation, high vibration, and short service life, with prior art devices often requiring complete rebuilds for maintenance.
Innovation Solution
A novel mechanical design incorporating a snap-fit outer housing assembly, low-volume vibration isolation, overlapping housing baffles, and a floating column clip assembly system to achieve a low-noise, durable, and easily repairable design, with components not anchored to the housing for improved vibration and noise isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If portable oxygen concentrators are miniaturized to reduce size and weight, then portability is improved, but noise levels increase and vibration mitigation becomes more difficult
Solution Approach 1:
The patent implements a nested housing structure where an inner housing is positioned within an outer housing, creating multiple enclosed chambers. This nested arrangement isolates noise-generating components (compressor, PSA mechanism) within the inner housing while the outer housing provides additional structural containment. The nested configuration allows for compact miniaturization while maintaining noise isolation barriers, thus reducing the transmission of harmful noise and vibration to the exterior.
Solution Approach 2:
The patent introduces an intermediary air gap and damping materials between noise-generating components and the housing walls. This intermediary layer acts as a buffer that absorbs and dissipates vibration energy, preventing direct transmission of mechanical noise. The air gap serves as a acoustic insulation barrier, effectively decoupling the vibration source from the housing structure and reducing overall noise emission.
2Reliability
If components are anchored to housing for structural stability, then device durability is improved, but vibration isolation and noise reduction are compromised
Solution Approach 1:
The patent employs flexible mounting elements and compliant interfaces between components and housing structures. Instead of rigid anchoring, flexible mounts are used to secure components within the housing. These flexible elements provide sufficient mechanical support for structural stability while simultaneously acting as vibration isolators, absorbing shock and reducing noise transmission. The compliant mounting system maintains component security without creating hard paths for vibration propagation.
3Ease of manufacture
If traditional assembly methods are used for manufacturing, then manufacturing simplicity is maintained, but ease of repair and refurbishment is reduced
Solution Approach 1:
The patent divides the housing into separable outer and inner housing sections that can be independently assembled and disassembled. This segmented design allows for modular manufacturing using simple processes while enabling easy access to internal components for repair and refurbishment. The separable housing structure permits technicians to open the device, service components, and reassemble without requiring complex disassembly procedures, thus improving ease of repair while maintaining manufacturing simplicity.
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 design enhances oxygen-to-weight ratio by up to 30%, reduces noise levels, increases durability, and allows for fast and inexpensive refurbishment, extending the device's operational life and usability under varied conditions.
Implementation Method 1
Most of these portable concentrators are based on Pressure Swing Adsorption (PSA) or Vacuum Pressure Swing Adsorption (VPSA) designs which feed compressed air to selective adsorption beds. In a typical oxygen concentrator, the beds utilize a zeolite adsorbent to selectively adsorb nitrogen, resulting in pressurized, oxygen-rich product gas.
Implementation Method 2
The compressor and moving parts are isolated from the housing by vibration isolation elements, such as rubber mounts or foam, to reduce noise and vibration.
Implementation Method 3
The housing may be formed by a snap-fit outer housing assembly, which provides structural integrity while allowing easy disassembly for repair and maintenance.
Data Source
AI summary
A portable oxygen concentrator designed for medical use with a novel housing and internal component design that reduces noise and vibration while increasing durability. The improved design of the portable oxygen concentrator further facilitates easy maintenance and repair over the life of the equipment.