Dual-Mode Facepiece Pressure Adjustment for Easier APR Exhalation
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Solution Overview
Problem
Existing dual mode breathing apparatuses fail to adjust the bias of the diaphragm between SCBA and APR configurations, leading to difficult exhalation in APR mode, and lack secure alignment of the regulator assembly with the facepiece, as well as compatibility with single-mode facepieces.
Innovation Solution
A breathing apparatus with a pneumatic pressure adjustment assembly that adjusts internal facepiece pressure based on the delivery of pressurized breathing gas, an alignment mechanism using a pin and recess for proper connection, and a safety device to ensure compatibility with the correct regulator, along with a clip system for the air purifying system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the breathing apparatus is configured to maintain positive pressure in SCBA mode, then toxic gases are prevented from entering the facepiece, but exhalation becomes difficult in APR mode where facepiece pressure should equal ambient pressure
Solution Approach 1:
The diaphragm biasing mechanism is made dynamically adjustable between two distinct states: a first biasing state for SCBA mode that maintains positive pressure to prevent toxic gas entry, and a second biasing state for APR mode that equalizes facepiece pressure with ambient pressure to enable easy exhalation. The system transitions between these states based on operational mode selection.
2Device complexity
If existing dual mode breathing apparatuses are used without diaphragm bias adjustment, then the device structure remains simple, but exhalation becomes difficult in APR configuration
Solution Approach 1:
The diaphragm biasing mechanism is made dynamically adjustable between two distinct states: a first biasing state for SCBA mode that maintains positive pressure to prevent toxic gas entry, and a second biasing state for APR mode that equalizes facepiece pressure with ambient pressure to enable easy exhalation. The system transitions between these states based on operational mode selection.
3Ease of manufacture
If existing dual mode breathing apparatuses lack alignment mechanisms, then the device assembly is easier, but secure alignment between regulator assembly and facepiece cannot be ensured
Solution Approach 1:
An alignment mechanism featuring a pin and recess geometry is implemented to ensure precise and secure alignment between the regulator assembly and facepiece during connection. The asymmetric pin-recess design prevents misalignment and ensures proper mating of the components, thereby enhancing connection reliability while maintaining ease of assembly.
4Device complexity
If existing dual mode breathing apparatuses lack safety devices, then the device structure remains simpler, but improper connections between regulator and facepiece cannot be prevented
Solution Approach 1:
An alignment mechanism featuring a pin and recess geometry is implemented to ensure precise and secure alignment between the regulator assembly and facepiece during connection. The asymmetric pin-recess design prevents misalignment and ensures proper mating of the components, thereby enhancing connection reliability while maintaining ease of assembly.
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
Facilitates easy switching between SCBA and APR modes with secure alignment and compatibility, ensuring proper exhalation valve operation and efficient use of dual-mode facepieces.
Implementation Method 1
A pneumatic pressure adjustment assembly may be in operative connection with the exhalation valve. The pneumatic pressure adjustment assembly may have a first pneumatic connection in operative connection with a second pneumatic connection in the regulator. The pneumatic pressure adjustment assembly may be operable to adjust the internal facepiece pressure required to open the exhalation valve based on whether the pressurized breathing gas is delivered to the pneumatic pressure adjustment assembly.
Implementation Method 2
The user's respiration creates a pressure differential between the inner and outer chambers of the regulator assembly which, in turn, causes displacement of the diaphragm thereby controlling the inlet valve mechanism, such as by selectively opening and closing the inlet valve mechanism.
Implementation Method 3
This positive pressure can, for example, be facilitated by biasing the diaphragm with a spring.
Implementation Method 4
an alignment mechanism for aligning the regulator with the facepiece such that the first pneumatic connection of the pressure adjustment assembly in the facepiece is aligned with the second pneumatic connection in the regulator.
Data Source
AI summary
A breathing apparatus includes a tank containing pressurized breathing gas, a regulator having an inlet connected to the tank, an outlet for providing breathing gas to a user, and a valve configured for controlling a flow of breathing gas between the inlet and the outlet. A facepiece includes a first port for connecting with the outlet of the regulator, a second port adapted to be connected to an air purifying system, and an exhalation valve. A pneumatic pressure adjustment assembly is in operative connection with the exhalation valve, and has a first pneumatic connection in operative connection with a second pneumatic connection in the regulator. The pneumatic pressure adjustment assembly is operable to adjust the internal facepiece pressure for opening the exhalation valve based on whether breathing gas is delivered to the pneumatic pressure adjustment assembly. An alignment mechanism is provided for aligning the regulator with the facepiece.