Breathing Sensing Device Pressure Chambers
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Solution Overview
Problem
Existing breathing sensing devices for diving equipment face challenges in reliability, scalability, and cost efficiency, with limitations in detecting pressure drops due to breathing and susceptibility to sudden pressure changes.
Innovation Solution
A breathing sensing device with a diaphragm having two pressure chambers connected by flow passages with different cross-sectional areas, featuring a sealed passage that opens above a specific pressure drop threshold and adjustable components to maintain sensitivity and compactness, ensuring reliable detection of breathing pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow passages with different cross-sectional areas are used to detect breathing pressure drops, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating different flow resistance characteristics in different parts of the pressure chamber system. The first pressure chamber has a larger cross-sectional area flow passage while the second pressure chamber has a smaller cross-sectional area flow passage, creating localized differences in flow properties that enable differential pressure detection during breathing events.
2Ease of operation
If the device is made compact by limiting pressure chamber height, then ease of operation is improved, but volume of balancing chamber is reduced
Solution Approach 1:
The patent applies nesting by placing the first pressure chamber inside or adjacent to the second pressure chamber in a vertically integrated configuration. This nested arrangement allows both chambers to occupy a compact footprint while maintaining sufficient internal volumes for proper breathing detection functionality.
3Reliability
If a sealed passage with high pressure threshold is used to protect against sudden pressure increases, then reliability is improved, but response time to actual breathing events may be delayed
Solution Approach 1:
The patent applies dynamics by using a flexible diaphragm that can dynamically respond to pressure changes. The diaphragm deflects in response to breathing-induced pressure drops while the sealed passage remains closed during normal operation, opening only when pressure differential exceeds the threshold set by the seal, thus providing both rapid response and protection.
4Manufacturing precision
If flow passage areas are made constant through pressure changes, then manufacturing precision is improved, but adaptability to different pressure conditions is reduced
Solution Approach 1:
The patent applies asymmetry by designing the first and second pressure chambers with different cross-sectional areas for their flow passages. This asymmetric design creates different flow characteristics that are sensitive to pressure changes, allowing the device to detect breathing events while maintaining manufacturable constant passage geometries.
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 enhances the reliability and scalability of breathing sensing devices by maintaining a momentary pressure difference between chambers, reducing exposure to sudden pressure increases, and allowing for adjustable sensitivity, thereby improving safety and cost efficiency.
Implementation Method 1
flow passages having different cross sectional passage areas arranged to facilitate detection of a pressure drop due to breathing
Implementation Method 2
The relation of cross sectional passage area between the cross sectional passage area providing a restricted flow passages to and/or from second pressure chamber is in the range of 1/50- 1/200 in relation to the cross sectional passage area providing a flow passage to and/or from the first pressure chamber
Implementation Method 3
a further, sealed through passage, having a seal arranged to open said passage above a pressure drop that exceeds a pressure drop that may caused by breathing within said system pressure
Data Source
AI summary
This invention relates to a breathing sensing device for detecting a pressure drop due to breathing. The device includes a diaphragm (100) having a first pressure chamber (120) on one side and a second pressure chamber (121) on a second side within an actuator housing. The first and second pressure chambers (120,121) are connected to a system pressure (L1) by flow passages (143, 153) having different cross sectional passage area (Ar, Af) arranged to facilitate detection of a pressure drop due to breathing.