Pneumatic Preflushing Unit for Closed-Circuit Respirator Gas Circuits
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Solution Overview
Problem
Existing closed-circuit respirators require complex and costly mechanical, electrical, or electronic preflushing systems to remove undesired gas residues, such as increased nitrogen and CO2, from the breathing gas circuit, making the initial use of these devices inefficient and costly.
Innovation Solution
A pneumatic preflushing unit with a basic body, valve chamber, and elastomer body that uses medium pressure to automate the preflushing process, ensuring a defined gas composition by controlling the flow of breathing gas through the breathing gas circuit without electronic or mechanical prestressing units, allowing for efficient and cost-effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mechanical, electrical, or electronic preflushing systems are used to remove undesired gas residues, then the gas composition in the breathing gas circuit can be controlled, but the device complexity and cost increase significantly
Solution Approach 1:
The patent employs a pneumatic preflushing system that uses pressure differential and fluid dynamics to control gas flow. A preflushing valve with a movable partition wall separates a preflushing chamber from the breathing gas circuit, allowing controlled introduction of fresh breathing gas to displace undesired gas residues through pressure-driven flow rather than complex mechanical or electronic control mechanisms
Solution Approach 2:
The invention extracts the preflushing function from the main breathing gas circuit by creating a separate preflushing chamber that can be isolated and activated independently. This allows the preflushing operation to be performed without continuously operating complex control systems, reducing overall device complexity while maintaining reliable gas composition control when needed
2Productivity
If automated preflushing systems are implemented, then the preflushing process becomes more efficient, but the cost and complexity of the device increase
Solution Approach 1:
The preflushing system is designed to be self-regulating through a movable partition wall that automatically responds to pressure differential. When fresh breathing gas is introduced into the preflushing chamber, the pressure increase automatically moves the partition wall to open the flow path to the breathing gas circuit, and when pressure equalizes, the partition wall returns to close the flow path, eliminating the need for external automated control systems
Solution Approach 2:
The system utilizes changes in pressure parameters to control the preflushing process. The movable partition wall responds to pressure differential between the preflushing chamber and the breathing gas circuit, automatically opening and closing the flow path based on pressure conditions. This pressure-based control achieves automated preflushing efficiency without requiring complex electronic or mechanical control systems
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 pneumatic preflushing unit provides a simple, cost-effective, and reliable method to automate the preflushing process, reducing the complexity and cost of initial device usage while ensuring a predefined gas composition, thereby extending the duration of the respirator's operation.
Implementation Method 1
an elastomer body with a counter-sealing surface, which separates the flow section in a fluid-tight manner from a control section and consists of an elastic material, is arranged in the valve chamber. Due to the selection of an elastic material, the elastomer body can act on the counter-sealing surface with a sealing force against the sealing surface of the valve body to seal the flow section
Implementation Method 2
an inlet port and an outlet port are in fluid-communicating connection with one another via a flow section of a valve chamber in the basic body. The inlet port and the outlet port are in fluid-communicating connection with one another via a flow section of a valve chamber in the basic body
Implementation Method 3
a control port is provided at the basic body for the controlled feed of breathing gas from the breathing gas supply into the control section to be able to guarantee a pressure equalization between the flow section and the control section
Data Source
AI summary
A preflushing unit (10) preflushes a breathing gas circuit (210) of a closed-circuit respirator (200). A basic body (20) has an inlet port (22), feeding breathing gas from a breathing gas supply (220), an outlet port (24) discharging breathing gas into the breathing circuit, and a flow section (32) fluid connecting a valve chamber (30). A valve body (40) with a sealing surface (42) is arranged in the valve chamber (30). An elastomer body (50) with a counter-sealing surface (52) in the valve chamber, fluid tight separates the flow section from a control section (34). The counter-sealing surface acts with a sealing force against the valve body for sealing the flow section. A control port (26) of the basic body provides a controlled feed of breathing gas from the breathing gas supply into the control section for pressure equalization between the flow section and the control section.