Ventilation Tube Helical Insulation Chamber
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Solution Overview
Problem
Conventional ventilation tubes for respiratory circuits face issues with heat loss and external temperature hazards due to inefficient heating elements, which can lead to reduced humidity delivery and potential occlusion, posing risks to patients and equipment.
Innovation Solution
A ventilation tube design featuring a helical separator member creating an insulation chamber around a heating element external to the fluid passageway, ensuring efficient heat transfer to the inner wall and reducing external heat loss, with the heating element bonded to the inner wall for enhanced heat transfer and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a heating element is located within the fluid passageway of the ventilation tube, then the heating efficiency is improved, but the airflow is disrupted and the heating element may become damaged
Solution Approach 1:
The heating element is extracted from the fluid passageway and relocated to the outer wall of the ventilation tube. This eliminates the disruption to airflow while maintaining heating functionality through the tube wall, resolving the contradiction between heating efficiency and airflow continuity.
2Reliability
If a heating element is embedded within a support bead of the ventilation tube, then the airflow disruption is reduced, but the heating efficiency decreases due to heat loss through the external surface
Solution Approach 1:
The outer wall is constructed with a composite structure comprising an inner layer and an outer layer with different thermal properties. The inner layer provides structural support while the outer layer has low thermal conductivity to minimize heat loss, creating a composite material system that reduces energy loss while maintaining reliability.
Solution Approach 2:
The outer wall exhibits local quality differences between its inner and outer layers, with the inner layer optimized for structural integrity and the outer layer optimized for thermal insulation. This localized differentiation of material properties reduces heat loss through the external surface while maintaining the support structure.
3Loss of energy
If the heating element is disposed externally to the fluid passageway with an insulation chamber, then the heat loss is reduced, but the device complexity increases
Solution Approach 1:
The insulation chamber is merged with the wall structure of the ventilation tube, integrating the insulation function into the existing structural components rather than adding separate insulation elements. This combining approach reduces device complexity while maintaining the heat loss reduction benefit.
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
This design enhances heat transfer to the ventilation gases, reduces 'rain-out' within the tube, and minimizes external heat loss, thereby improving humidity delivery and safety by maintaining lower external temperatures.
Implementation Method 1
a heating element of resistively-heated wire
Implementation Method 2
define an insulation chamber between the inner and outer walls
Implementation Method 3
The outer wall having a greater thickness than the inner wall causes the heat generated by the heating element to be transferred preferentially through the inner wall into the fluid passageway
Implementation Method 4
a certain amount of water vapour will cool and start to condense, forming water droplets
Data Source
AI summary
A ventilation tube (20, 120, 220) is disclosed. The ventilation tube (20, 120, 220) comprises an inner wall (22, 122, 222) that defines a fluid passageway for 5 ventilation gases, an outer wall (24,124,224) that surrounds the inner wall (22, 122, 222) and has a greater thickness than the inner wall (22, 122, 222), a helical separator member (26, 126, 226) interposed between the inner and outer walls (22, 122, 222, 24, 124, 224) so as to define an insulation chamber between the inner and outer walls (22, 122, 222, 24, 124, 224), and a heating element (28, 128, 228) disposed within the insulation chamber.