Conductive Plastic Humidifier Heater for Differential Water Heating
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Solution Overview
Problem
Resistive metallic heating plates used in respiratory humidifiers are difficult and expensive to mold, have non-ideal electrical and thermal conductivity, and do not aesthetically integrate with the humidification chamber, posing challenges in industrial use and consumer appeal.
Innovation Solution
A respiratory humidifier with a heater constructed from electrically conductive plastic material, featuring a variable thickness and overmoulded design that promotes differential heating, allowing for efficient heating of liquids and integration with the humidification chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistive metallic heating plate is used in a humidification chamber, then heating function is achieved, but manufacturing difficulty and cost increase
Solution Approach 1:
The patent changes the material parameter from metal to electrically conductive plastic, which maintains the heating function while significantly improving ease of manufacture. The conductive plastic can be molded into desired shapes more easily and is less expensive than metallic materials, directly resolving the contradiction between reliability of heating function and ease of manufacture.
Solution Approach 2:
The patent uses composite material - electrically conductive plastic - which combines the electrical conductivity needed for heating with the manufacturing advantages of plastic materials. This composite approach allows the heating element to be molded seamlessly into the humidification chamber while maintaining effective heating performance, addressing both the functional requirement and manufacturing constraints.
2Power
If a resistive metallic heating plate is used, then heating capability is provided, but electrical and thermal conductivity performance is suboptimal
Solution Approach 1:
The patent modifies the electrical and thermal conductivity parameters by selecting a specifically formulated electrically conductive plastic material. This material is engineered to provide optimal electrical conductivity for resistive heating while maintaining appropriate thermal conductivity for efficient heat transfer to the liquid, thereby improving overall heating capability and performance reliability.
3Reliability
If a resistive metallic heating plate is used, then heating function is achieved, but aesthetic integration with humidification chamber deteriorates
Solution Approach 1:
The patent merges the heating element with the humidification chamber structure by molding the electrically conductive plastic heater directly into the chamber body. This integration eliminates the need for separate metallic heating plates that would visually disrupt the chamber's aesthetic appearance, while the heater continues to perform its heating function effectively. The seamless integration resolves the contradiction between functional reliability and aesthetic quality.
4Ease of manufacture
If a heater with uniform thickness is used, then manufacturing is simplified, but heating efficiency is reduced
Solution Approach 1:
The patent applies local quality variation by designing the heater with non-uniform thickness distribution. Specific regions of the heater have different thicknesses to optimize heat distribution across the liquid contact surface. This localized variation improves heating efficiency by ensuring more uniform heat transfer, while the overall shape is still molded as a single piece, maintaining reasonable manufacturing simplicity.
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 electrically conductive plastic heater provides efficient heating and humidification while being cost-effective and aesthetically integrated with the humidification chamber, improving the overall performance and user experience of respiratory therapy systems.
Implementation Method 1
The heater may be constructed from an electrically conductive plastic material... The heater may be configured to promote differential heating of liquid in the reservoir
Implementation Method 2
The stream of air may be heated to near body temperature. The stream of air may be humidified. The humidification may be performed by forcing the stream of air to travel through a respiratory humidifier containing water and a heater for heating the water. In such a system, the heater encourages the evaporation of the water, which in turn imbues the stream of air with moisture and/or heat.
Data Source
AI summary
An electrically conductive plastic (ECP) material can be used to heat water in a reservoir of a respiratory humidifier to encourage heating and/or humidification of gases passing through the respiratory humidifier. The electrically conductive plastic material can at least in part overmould the base and/or walls of the chamber and/or the reservoir of the respiratory humidifier. The reservoir can also partially or fully be formed from the electrically conductive plastic material. Furthermore, the humidification system can be configured to create substantially equal or differential heating of water in the reservoir.