Dual Float Valve System for Respiratory Humidifier
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Solution Overview
Problem
Current fluid control mechanisms in respiratory humidification systems, particularly those with dual valve mechanisms, are prone to failure due to the large sealing area and force required, leading to potential liquid leakage and harm to patients.
Innovation Solution
A float valve system with a first and second valve seat, actuating members, and flexible diaphragm, where a lower float and upper float independently seal the valve assembly to prevent excessive liquid entry, providing a redundant safety mechanism with smaller sealing areas and reduced risk of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual valve mechanism with coaxially arranged valves is used to prevent liquid leakage, then reliability is improved, but the sealing area and force required increase, leading to valve failure
Solution Approach 1:
The single valve is divided into two separate valves arranged in parallel rather than coaxially. Each valve has its own actuating member and sealing surface, distributing the sealing requirements across two independent components rather than requiring one complex coaxial valve to handle all sealing duties.
Solution Approach 2:
The valves are arranged in a parallel configuration rather than one inside the other (coaxial arrangement). This spatial reconfiguration reduces the sealing area requirements and allows each valve to operate independently with smaller, more manageable sealing surfaces.
2Reliability
If a dual valve mechanism with coaxially arranged valves is used to prevent liquid leakage, then reliability is improved, but the sealing area increases, leading to valve failure
Solution Approach 1:
The sealing function is segmented into two separate valves, each with its own sealing surface. This division allows each sealing surface to be smaller than what would be required for a single comprehensive valve, reducing the overall sealing area while maintaining redundancy.
Solution Approach 2:
By arranging valves in parallel rather than coaxially, the sealing surfaces are distributed across different spatial locations rather than requiring a large overlapping sealing area. This dimensional change reduces the total sealing area needed while maintaining effective liquid prevention.
3Device complexity
If a single valve is used to control liquid level, then device complexity is reduced, but reliability deteriorates due to potential valve failure
Solution Approach 1:
The single valve control system is segmented into two independent valves, each capable of functioning autonomously. This segmentation increases reliability through redundancy while keeping each individual valve simple in design, so the overall system remains relatively simple despite having two components.
Solution Approach 2:
Each valve is designed with localized sealing and actuation mechanisms tailored to its specific function. The first valve handles primary liquid level control while the second valve provides backup protection, allowing each component to be optimized for its specific role rather than requiring a single complex valve to handle all scenarios.
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 float valve system effectively controls the liquid level in the humidification chamber, preventing excessive fluid entry and reducing the risk of valve failure, ensuring patient safety by providing a redundant mechanism to prevent liquid overflow even if one float fails.
Implementation Method 1
the fluid conduit comprises a flexible diaphragm extending between the first valve seat and the second valve seat, the diaphragm adapted to deflect upon actuation of the first actuating member and the second actuating member
Implementation Method 2
a first float coupled to the first actuating member so as to close the first valve seat upon fluid in the chamber reaching a first predetermined level and a second float is coupled to the second actuating member so as to close the second valve seat upon fluid in the chamber reaching a second predetermined level
Data Source
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AI summary
A float valve system for controlling an amount of liquid in a chamber is disclosed that includes a first valve seat (84) and a second valve seat (86). Liquid enters the chamber in a first direction to the first valve seat and is transferred in a second direction to the second valve seat. First and second actuating members (58, 60) are provided to selectively open and close the first valve seat and the second valve seat, respectively. A first float (52) is coupled to the first actuating member (58) so as to close the first valve seat upon fluid in the chamber reaching a first predetermined level and a second float (54) is coupled to the second actuating member (60) so as to close the second valve seat upon fluid in the chamber reaching a second predetermined level that is different from the first predetermined level.