Humidifier Tub Lining for Heat Transfer and Electrical Isolation
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Solution Overview
Problem
Existing humidifier tubs face challenges in achieving effective heat transfer while insulating the heating element from water, and accommodating thermal expansion, which affects efficiency and durability.
Innovation Solution
A tub design using a combination of two materials, where a stable, insulating first material forms the container and a biocompatible, thermally conductive second material lines the heating element and inner surfaces, providing electrical insulation and accommodating thermal expansion, and is molded over the heating element for enhanced sealing and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single material is used for the container, then manufacturing is simple, but it cannot simultaneously provide thermal insulation and thermal conduction
Solution Approach 1:
The patent employs a composite structure consisting of an outer container made of thermally insulating material and an inner liner made of thermally conductive material. This composite approach allows the system to simultaneously achieve thermal insulation (reducing energy consumption) and thermal conduction (improving heat transfer efficiency) by combining materials with complementary thermal properties.
Solution Approach 2:
The patent applies different material properties to different regions of the container. The outer container uses thermally insulating material to reduce heat loss to the environment, while the inner liner uses thermally conductive material to efficiently transfer heat from the heating element to the liquid. This local differentiation of material quality optimizes both energy efficiency and heating performance.
2Stability of the object's composition
If a rigid lining is used, then structural stability is improved, but thermal expansion stress cannot be accommodated
Solution Approach 1:
The patent employs a flexible or elastomeric liner material that can dynamically adapt to thermal expansion and contraction of the heating element and container. This dynamic property allows the lining to maintain structural integrity and sealing effectiveness across varying temperature conditions, preventing stress concentration and potential failure.
Solution Approach 2:
The patent selects lining materials with specific elastomeric properties that allow controlled deformation under thermal stress. The material parameters (such as elastic modulus and thermal expansion coefficient) are chosen to accommodate the thermal cycling conditions, enabling the lining to flexibly respond to temperature changes while maintaining its functional integrity.
3Power
If the heating element is directly exposed, then heat transfer is maximized, but electrical insulation from water is compromised
Solution Approach 1:
The patent introduces a thermally conductive liner as an intermediary layer between the heating element and the water. This liner material serves as a mediator that provides electrical insulation (preventing short circuits) while maintaining efficient thermal conduction (transferring heat to the water), thus resolving the contradiction between safety and heating efficiency.
Solution Approach 2:
The patent uses composite material structure where the inner liner combines electrical insulating properties with thermal conduction properties. This composite approach allows the system to achieve both electrical safety (isolating the heating element from water) and thermal efficiency (effective heat transfer to the liquid being heated).
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 improves heat transfer efficiency, reduces energy consumption, and enhances durability by allowing for stress accommodation and improved sealing, making it cost-effective and suitable for various applications.
Implementation Method 1
The water in the water tub is typically heated via thermal conduction between the heating element and the tub base of the water tub
Implementation Method 2
accommodate any stress caused by thermal expansion of, e.g., the heating element
Implementation Method 3
The second material, on the other hand, may be chosen such as to provide a preferably elastic lining which is adapted to electrically insulate the supply of water from the heating element and at the same time accommodate any stress caused by thermal expansion
Implementation Method 4
a heating element for heating the water in the tub
Data Source
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AI summary
The present technology relates to a tub for a humidifier comprising a container made of a first material, a heating element, and a lining made of a second, preferably biocompatible, material different from the first material, wherein the container comprises a base and a side wall defining a reservoir for a supply of liquid to be evaporated, the heating element is provided on the base of the container, and the lining covers the heating element and a substantial portion of the inner surface of the side wall of the container.