Respiratory Protection Valve With Elastomeric Fit-Test Sealing
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Solution Overview
Problem
Existing respiratory protection devices face challenges in effectively testing the integrity of the face seal, particularly in preventing unfiltered air from entering the mask during positive or negative pressure tests, and there is a need for improved mechanisms to ensure a secure fit and reliable airflow control.
Innovation Solution
The device incorporates a valve assembly that is operable between open and closed configurations, featuring an elastomeric seal and a sealing surface that engages with the elastomeric seal in the closed configuration to block airflow, allowing for a robust fit test by ensuring a secure seal and preventing airflow through the breathing air source components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve assembly with elastomeric seal is used to block airflow during fit testing, then the reliability of seal integrity testing is improved, but the device complexity increases
Solution Approach 1:
The valve assembly is integrated directly into the mask body structure, combining the valve function with the existing mask framework. The elastomeric seal is incorporated as part of the valve assembly rather than a separate component, reducing overall system complexity while maintaining reliable seal blocking capability during fit testing.
Solution Approach 2:
The valve assembly serves multiple functions: it blocks airflow during fit testing, maintains seal integrity, and can be integrated with the breathing air source component mounting system. The elastomeric seal provides both sealing during normal operation and sealing during valve-closed fit testing, eliminating the need for separate sealing mechanisms.
2Measurement precision
If the valve assembly engages with the elastomeric seal to prevent airflow, then the measurement precision of fit test is improved, but the ease of operation deteriorates
Solution Approach 1:
The valve assembly is designed with dynamic engagement capability, allowing the sealing surface to move and adapt to the elastomeric seal position. The valve can transition between open and closed states smoothly, enabling precise airflow control for fit testing while maintaining ease of operation through flexible sealing contact rather than rigid fixed-position engagement.
3Ease of manufacture
If the elastomeric seal is used for sealing engagement, then the ease of manufacture is improved, but the loss of substance increases due to material deformation
Solution Approach 1:
The elastomeric seal is designed with variable thickness parameters, featuring a thicker first end region for structural integrity and mounting, and a thinner second end region for flexible sealing engagement. This parameter variation optimizes both manufacturing ease (simpler single-piece construction) and material efficiency (reduced material in non-critical areas) while preventing excessive material deformation during valve operation.
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 provides a reliable method for performing a fit test, ensuring a consistent seal under various conditions and reducing component complexity and manufacturing costs while maintaining a secure fit and airflow control, facilitating easy detection of leaks.
Implementation Method 1
The elastomeric seal may have a reduced material thickness at the second end region, the second end region configured to open when air flows from the first end region towards the second end region and configured to close to prevent airflow from the second end region towards the first end region
Data Source
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AI summary
The present disclosure provides a respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component that is in sealing engagement with the elastomeric seal and the valve assembly is configured and arranged such that when the valve assembly is moved into the closed configuration, a sealing surface contacts the outer surface of the elastomeric seal and a channel of the elastomeric seal is clamped closed.