Curved Heating Trajectory in E-Cigarette Vaporizers for Thermal Stress Relief
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Solution Overview
Problem
Existing e-cigarette vaporization assemblies suffer from reduced service life due to bending or breaking of the heating element under cold-hot cycling, primarily because the temperature distribution is uneven, leading to differential expansion and contraction that causes stress.
Innovation Solution
The e-cigarette vaporizer features a specially designed resistance heating trajectory with non-zero curvature, optimizing stress distribution by dispersing internal stress through a bending shape and symmetrical or alternating bending directions, reducing temperature differences and preventing deformation or breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a straight-line resistance heating trajectory is used, then the heating element structure is simple, but the temperature gradient causes internal stress leading to deformation or breakage under cold-hot cycling
Solution Approach 1:
The resistance heating trajectory is designed with curved sections instead of straight lines, creating a bending shape that accommodates thermal expansion and contraction. The curvature radius is specifically controlled to be between 0.5-2mm, which effectively distributes internal stress during cold-hot cycling and prevents deformation or breakage of the heating element.
2Reliability
If the resistance heating trajectory is made curved to reduce stress, then the service life is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Specific parameter ranges are established for the curved trajectory design: curvature radius between 0.5-2mm, and arc length between 1-5mm. These quantified parameters provide clear manufacturing guidelines while ensuring the curved shape effectively reduces internal stress during thermal cycling, balancing reliability improvement with manufacturability.
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 optimized heating element design enhances the durability and longevity of the e-cigarette vaporizer by effectively managing stress and temperature distribution, preventing breakage under cold-hot cycling.
Implementation Method 1
a heating element, formed on the porous body and configured to heat the liquid substrate in at least a part of the porous body to form aerosols
Implementation Method 2
the liquid is vaporized after being heated, so as to generate inhalable vapor or aerosols
Implementation Method 3
Capillary micropores are provided inside the porous body, and the porous body may absorb the liquid and transmit the liquid to the heating element through the micropores inside the porous body
Data Source
AI summary
An e-cigarette, an e-cigarette vaporizer, and a vaporization assembly are provided. The e-cigarette vaporizer includes: a liquid storage cavity, configured to store a liquid substrate; a porous body, in fluid communication with the liquid storage cavity to absorb the liquid substrate; and a heating element, including a first electrode connection portion, a second electrode connection portion, and a resistance heating trajectory extending between the first electrode connection portion and the second electrode connection portion. A curvature of any position on a part of the resistance heating trajectory close and connected to the first electrode connection portion and/or the second electrode connection portion is not zero. The heating element of the e-cigarette vaporizer adopts the resistance heating trajectory to perform heating, and causes a part of the resistance heating trajectory that is close and connected to an electrode connection portion to be in a bending shape whose curvature is not zero.