Respiratory Mask Seal Check Flap Mechanism
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Solution Overview
Problem
Existing respiratory protection devices lack an effective mechanism for performing a positive pressure seal check, which is essential for ensuring an adequate seal to prevent unfiltered air from entering the mask, and existing methods are either cumbersome or inadequate in ensuring the integrity of the seal.
Innovation Solution
A respiratory protection device with a seal check mechanism featuring a button and flap system that biases the exhalation valve to a closed position, utilizing flexible and rigid materials to facilitate a positive pressure fit check, allowing a wearer to easily determine the presence of leaks around the mask periphery by attempting to exhale while the mechanism is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positive pressure seal check is performed by blocking the exhalation valve and having the wearer exhale, then an adequate seal is indicated by increased internal pressure, but existing mechanisms for blocking the valve are cumbersome or inadequate
Solution Approach 1:
The seal check mechanism is designed to be self-actuating through the wearer's own exhalation. When the wearer exhales, the pressure differential automatically closes the flap and blocks the exhalation valve, eliminating the need for separate manual valve blocking actions. The system uses the wearer's natural breathing action to perform the seal check procedure.
Solution Approach 2:
The seal check function is integrated into the existing exhalation valve mechanism rather than being a separate system. The flap mechanism combines the valve blocking function with the seal check function, merging two operations into a single integrated component that performs both valve control and seal verification.
2Reliability
If multiple actuators or complex procedures are used to ensure seal integrity, then the seal check becomes more thorough, but the device complexity and user burden increase
Solution Approach 1:
The seal check function is extracted from complex multi-actuator systems and implemented through a simple single-flap mechanism. By isolating the essential function of blocking the exhalation valve to a single movable flap, the design eliminates unnecessary complexity while maintaining seal verification capability.
Solution Approach 2:
Instead of requiring the user to manually close a valve through complex actuation, the design inverts the approach by allowing the wearer's exhalation pressure to automatically close the flap. The natural exhalation action is reversed from a simple breathing act to an automatic seal check mechanism activation.
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
Enables a straightforward and effective positive pressure fit check, ensuring an adequate seal by preventing air from escaping, thus providing a reliable method for users to verify the mask's seal integrity without requiring multiple actuators or complex procedures.
Implementation Method 1
the button comprises a flexible material configured to bias the seal check mechanism in an open position
Data Source
AI summary
There is provided a respiratory protection device comprising a mask body defining a breathable air zone for a wearer and having a front cover; an exhale valve in fluid communication with the breathable air zone; and a seal check mechanism disposed in the front cover, where the seal check mechanism comprises a button associated with a flap such that, when actuated, the flap biases the exhale valve in a closed position. There is provided in some embodiments a plane of the button intersecting with a plane of the exhale valve. There is also provided in some embodiments the button and the plunger being a monolithic part.