E-Cigarette Heater Coil and Air Inlet Design for Consistent Draw
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Solution Overview
Problem
Existing electronic cigarettes often suffer from inconsistent resistance to draw (RTD) and hot sensations during use due to variations in air inlet sizes and heater coil hot spots, which affect user experience and performance.
Innovation Solution
The design incorporates precision-formed air inlets and a resistive heater coil with controlled spacing to maintain consistent RTD and prevent hot spots, using materials like nickel-chromium alloys and a multi-ported mouth end insert to distribute aerosol evenly and reduce heat perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater element is used to vaporize liquid material, then aerosol production is achieved, but hot spots and excessive temperatures occur during use
Solution Approach 1:
The heater element uses a mesh structure with non-uniform wire distribution where wire density varies across different regions. Areas with higher liquid material contact have denser wire patterns to provide more heating zones, while areas with less contact have sparser patterns. This local variation in heating quality ensures uniform temperature distribution across the heater surface, preventing hot spots while maintaining effective vaporization.
2Ease of operation
If air inlet ports are made larger to improve airflow, then resistance to draw varies, but consistency in RTD performance deteriorates
Solution Approach 1:
The air inlet ports are designed with precisely controlled dimensions and geometries to optimize the balance between airflow and RTD consistency. By carefully selecting and maintaining specific parameter values for port size, shape, and positioning, the design achieves both adequate airflow and consistent resistance to draw performance across multiple puffs and articles.
3Productivity
If vapor is delivered directly to the mouthpiece, then aerosol output is achieved, but hot sensation at the lips occurs
Solution Approach 1:
A mouth end insert is positioned between the vaporization chamber and the mouthpiece opening. This intermediary component provides an extended pathway that allows vapor to travel through additional air mixing zones and cool down before reaching the user's lips. The insert may include features that promote turbulent mixing with cooler ambient air, effectively reducing the temperature of the delivered aerosol while maintaining adequate vapor output.
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 ensures consistent smoking experience by maintaining reproducible RTD and minimizing hot sensations, enhancing user satisfaction and performance reliability.
Implementation Method 1
a heater element which vaporizes liquid material to produce an aerosol or 'vapor'. The heater element preferably comprises a resistive heater coil
Implementation Method 2
a wick in communication with the liquid material and in communication with the heater such that the wick delivers the liquid material to the heater
Data Source
AI summary
An electronic smoking article includes an outer tube extending in a longitudinal direction, an inner tube within the outer tube and including a pair of opposing slots, a liquid supply comprising a liquid material, a coil heater, a wick and a mouth end insert. The coil heater is located in the inner tube. The coil heater is formed of an iron-free, nickel-chromium alloy and has substantially uniformly spaced windings. The wick is surrounded by the coil heater such that the wick delivers liquid material to the coil heater and the coil heater heats the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol in the inner tube.