SCBA Pressure Regulator Assembly with Bypass Piston
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Solution Overview
Problem
Existing positive pressure-type firefighting pressure regulator and mask assemblies face challenges such as complex assembly, valve chatter, high breathing resistance, unstable pressure reduction, and cumbersome operation, especially in low-temperature environments.
Innovation Solution
A pressure regulator assembly with a balanced valve assembly and a bypass assembly that includes a piston, sealing member, and a rotatable member to facilitate easy engagement and disengagement of the piston, reducing movement resistance and allowing for adjustable air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positive pressure-type air supply valve is used, then the breathing apparatus can maintain positive pressure, but the assembly becomes complex and difficult to assemble
Solution Approach 1:
The valve assembly is segmented into distinct functional components: a body housing, a piston assembly, a sealing member, and a bypass assembly. Each component can be independently manufactured and assembled, simplifying the overall assembly process while maintaining the positive pressure function through the coordinated operation of these segmented parts.
Solution Approach 2:
The piston assembly incorporates a rotatable member that allows dynamic adjustment of the valve state. By rotating the member, the piston can be moved between engaged and disengaged positions, enabling easy switching between normal operation and bypass modes without complex assembly procedures.
2Stress or pressure
If a traditional air supply valve is used, then pressure reduction can be achieved, but valve chatter occurs that cannot be completely eliminated
Solution Approach 1:
The piston acts as an intermediary element between the inlet and outlet chambers. It provides a controlled, progressive opening mechanism that smooths pressure transitions and eliminates the abrupt valve movements that cause chatter. The piston's gradual displacement allows for stable pressure reduction without vibration or noise.
3Stress or pressure
If existing pressure regulator assemblies are used, then pressure regulation can be achieved, but breathing resistance is high and operation is cumbersome
Solution Approach 1:
The bypass assembly with its rotatable member provides dynamic control over the air flow path. When activated, it creates a low-resistance bypass route that reduces breathing effort. The system adapts between normal pressure regulation mode and low-resistance bypass mode, making operation easier especially in cold environments where high resistance would be problematic.
4Stress or pressure
If existing pressure regulator assemblies are used, then pressure reduction can be achieved, but the system requires two hands to operate and is bulky
Solution Approach 1:
The rotatable member of the bypass assembly is designed with a handwheel configuration that can be easily gripped and rotated. This curved, ergonomic design allows for simple one-handed operation, eliminating the need for two-handed manipulation required by traditional valve mechanisms and reducing the overall bulk of the 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
The solution provides a durable, comfortable, and easy-to-assemble pressure regulator assembly with reduced breathing resistance, minimized chatter, and improved operational ease, even in low-temperature environments.
Implementation Method 1
the at least one biasing element comprises at least one spring
Implementation Method 2
facilitate the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A pressure regulator assembly (100) for an SCBA including a valve assembly (102) having a piston (34), a cylinder (36) configured to receive the piston (34), a sealing member (35) configured for engagement by the piston (34), a conduit (241) extending through the piston (34) and facilitating fluid communication between an inlet chamber (110) and a cavity (104) of the cylinder, and a driving assembly (108) configured to facilitate the engagement and disengagement of the piston (34) responsive to a change of pressure in the outlet chamber (112). A bypass assembly (120) for an SCBA is also disclosed.