Dynamic Inlet Restrictor for Portable Oxygen Concentrator Noise Control
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Solution Overview
Problem
Portable oxygen concentrators emit high levels of noise, which increases with oxygen demand, and existing sound damping materials like foam increase the device's size and weight, making them less convenient for use.
Innovation Solution
Incorporating an inlet opening restrictor that dynamically changes its characteristics in response to oxygen demand, using a compressor to pressurize air and a sieve bed to separate and deliver concentrated oxygen, thereby reducing noise levels while maintaining portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound damping materials like foam are provided inside the unit, then the sound level output is lowered, but the overall size and weight of the device increase
Solution Approach 1:
The patent removes the traditional sound damping foam material from the device interior and replaces it with an external inlet opening restrictor. This extraction eliminates the weight penalty of internal damping materials while still achieving noise reduction through controlled airflow restriction at the inlet opening.
Solution Approach 2:
The inlet opening restrictor acts as an intermediary element between the external environment and the compressor inlet. By positioning the restrictor at the inlet opening rather than inside the device, it mediates the airflow and noise generation at the source without adding internal weight or volume.
2Object-affected harmful factors
If sound damping materials like foam are provided inside the unit, then the sound level output is lowered, but the overall size of the device increases
Solution Approach 1:
The patent extracts the sound damping function from the internal device volume by moving the noise control mechanism to the inlet opening. This eliminates the need for internal foam materials that would occupy device volume, thereby maintaining a compact form factor.
Solution Approach 2:
The noise control solution is moved from the internal three-dimensional space to the external boundary dimension at the inlet opening. The restrictor operates in the spatial dimension of the inlet opening rather than occupying internal device volume, achieving noise reduction without increasing device size.
3Productivity
If the inlet opening size is increased to meet high oxygen demand, then the airflow capacity is sufficient, but the noise level increases
Solution Approach 1:
The inlet opening restrictor is designed to be dynamic rather than static, adjusting its effective opening size based on operating conditions. This allows the system to maintain a smaller effective opening during low-demand periods to reduce noise, while still providing sufficient airflow capacity when oxygen demand increases.
Solution Approach 2:
The patent changes the parameter of inlet opening size dynamically rather than maintaining a fixed large opening. By adjusting the opening size parameter according to operational needs, the system achieves both noise reduction during low-demand periods and sufficient airflow capacity when oxygen demand is high.
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 output by adjusting the inlet opening size based on oxygen demand, minimizing sound emission when demand is low and increasing airflow capacity when demand is high, without compromising the device's portability or efficiency.
Implementation Method 1
a compressor configured to pressurize the air received through the inlet opening
Implementation Method 2
a sieve bed configured to separate the pressurized air into a concentrated gas component for delivery to the subject
Data Source
AI summary
An oxygen concentrator an inlet opening configured to receive air. The concentrator also includes a compressor configured to pressurize the air received through the inlet opening. An inlet opening restrictor is configured to dynamically change a characteristic of the inlet opening responsive to increased or decreased demand for the pressurized air. The concentrator further includes a sieve bed configured to separate the pressurized air into a concentrated gas component for delivery to a subject.