Respiratory Pressure Therapy Device Noise Reduction
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Solution Overview
Problem
Existing respiratory pressure therapy (RPT) devices face challenges in achieving a balance between size, noise reduction, and efficacy, particularly in portable devices used for sleep therapy, with issues such as discomfort, noise, and difficulty in use.
Innovation Solution
The RPT device is designed with a two-part enclosure that minimizes noise transmission through a compression seal and constrained walls, combined with mufflers to reduce noise output, while maintaining a compact size and providing a wide range of therapy pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the RPT device is made compact and portable, then ease of operation and adaptability are improved, but noise transmission and noise output increase
Solution Approach 1:
The enclosure is divided into two separate portions (first portion and second portion) that can be assembled together. This segmentation allows for strategic placement of noise reduction features at the interface between portions while maintaining a compact overall form factor suitable for portable use.
Solution Approach 2:
A compression seal is introduced as an intermediary element between the first and second portions of the enclosure. This seal serves as a noise barrier that reduces noise transmission through the joint interface, allowing the device to remain compact while mitigating noise leakage that would otherwise occur at assembly interfaces.
2Object-generated harmful factors
If noise reduction measures are added to the RPT device, then harmful factors are reduced, but device complexity increases
Solution Approach 1:
The noise reduction function is merged into the enclosure structure itself through the compression seal at the interface between portions. Rather than adding separate noise reduction components, the sealing element serves dual purposes: mechanical sealing and acoustic insulation, thereby reducing noise transmission without significantly increasing device complexity.
Solution Approach 2:
The compression seal utilizes a flexible sealing element that can be compressed to create an effective noise barrier at the enclosure interface. This flexible seal provides noise reduction functionality through its material properties and compression mechanism without requiring complex rigid structures or additional noise isolation chambers.
3Object-generated harmful factors
If the enclosure is sealed to reduce noise, then noise transmission is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The sealing mechanism relies on compression force applied to the seal element rather than requiring extremely tight dimensional tolerances between enclosure portions. By changing the sealing approach from precision-fit rigid joints to compression-based flexible seals, the system achieves effective noise transmission reduction while maintaining reasonable manufacturing precision requirements.
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 achieves reduced noise levels and improved patient compliance by minimizing noise and size, allowing for effective therapy in various environments, including home and travel settings.
Implementation Method 1
a compression seal between the at least two parts
Implementation Method 2
minimizes noise transmission through a compression seal
Implementation Method 3
combined with mufflers to reduce noise output
Data Source
Figure 1
Figure 2A
Figure 2B~2F
AI summary
A respiratory pressure therapy device includes a blower to provide a supply of air for respiratory pressure therapy, a user interface, an air inlet, a suspension system arranged to suspend the blower, a seal, e.g., gasket, a constrainment arrangement, and an enclosure to enclose the blower and the blower suspension system and to form a chamber. The enclosure includes a first portion and a second portion. The first portion of the enclosure includes a first interior surface, a first exterior surface and a first intermediate surface located between the first interior surface and the first exterior surface. The second portion of the enclosure includes a second interior surface, a second exterior surface and a second intermediate surface located between the second interior surface and the second exterior surface. The user interface is mounted on the first exterior surface. The seal is arranged to be in compression between the first intermediate surface and the second intermediate surface in use. The constrainment arrangement is configured to limit lateral movement of the first portion and the second portion.