Heating Member Protrusions for Uniform Aerosol Heating
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Solution Overview
Problem
Traditional 'heat-not-burn' aerosol-generating devices face issues with uneven temperature distribution between the inner and outer periphery of the aerosol-generating substrate due to inefficient heat transfer, leading to inadequate heating of the inner substrate.
Innovation Solution
The device incorporates a heating member with protrusions on its inner surface, creating airflow channels that facilitate a combination of heat conduction and convection, slowing down the heat transfer rate to match the inner and outer periphery heating rates, thereby reducing temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electromagnetic induction heating is used to heat the aerosol-generating substrate, then heating efficiency is improved and the substrate reaches high temperature quickly, but temperature distribution between inner and outer periphery becomes uneven
Solution Approach 1:
The heating member is segmented into multiple protrusions distributed on its inner surface, creating multiple airflow channels instead of a single continuous channel. This segmentation allows heat to be distributed more uniformly across the aerosol-generating substrate by creating multiple heat transfer paths, resolving the contradiction between fast heating and uniform temperature distribution.
Solution Approach 2:
Airflow channels are introduced into the heating system to utilize convection for heat transfer. The protrusions create channels through which air flows, carrying heat from the heating member to the aerosol-generating substrate. This pneumatic approach complements thermal conduction and ensures more uniform temperature distribution while maintaining high heating efficiency.
2Productivity
If the aerosol-generating substrate is heated at high temperature quickly, then aerosol generation speed is improved, but harmful substances may be generated due to overheating
Solution Approach 1:
The airflow channels create a natural feedback mechanism where air continuously flows through the heating zone, carrying away excess heat and preventing localized overheating. This feedback loop ensures that the temperature remains within the optimal range for aerosol generation without reaching levels that would produce harmful substances, while still maintaining high aerosol generation speed.
Solution Approach 2:
The system changes the thermal parameters by introducing convective heat transfer through airflow channels, which modifies the heat distribution pattern. This parameter change allows the substrate to be heated uniformly at high temperature without creating hot spots that would generate harmful substances, thus maintaining both high productivity and safety.
3Speed
If the outer periphery of the substrate is heated intensely, then heating speed is improved, but inner heat transfer becomes insufficient
Solution Approach 1:
The heating approach is extended into the radial dimension by creating airflow channels that reach from the outer periphery toward the inner core of the substrate. This dimensional extension allows heat to be transmitted not only from the outer surface but also through the thickness of the substrate, ensuring adequate heating of the inner regions while maintaining high overall heating speed.
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 solution effectively addresses the uneven temperature distribution issue by promoting heat convection, ensuring more uniform heating and reducing the risk of overheating, while also improving inhalation resistance and user experience.
Implementation Method 1
heat is conducted to the aerosol-generating substrate, and baking and heating are performed on the aerosol-generating substrate
Implementation Method 2
at least one protrusion is disposed on the inner surface of the first sidewall, the protrusion makes a second airflow channel formed between the first sidewall and the aerosol-generating substrate
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An aerosol generating device (10), comprising a heating base (17) and a heating member (19), wherein the heating base (17) is provided with a heating cavity (173); the heating member (19) is used for accommodating and heating an aerosol generating matrix (11); the heating member (19) is arranged in the heating cavity (173); the heating member (19) comprises a first side wall (191); a first airflow channel (21) is formed between the first side wall (191) and an inner surface of the heating cavity (173); an inner surface of the first side wall (191) is provided with protrusions (193); a second airflow channel (20) is formed between the first side wall (191) and the aerosol generating matrix (11) by the protrusions (193); and the first airflow channel (21) and the second airflow channel (20) both lead to the bottom of the heating cavity (173) from the outside of the aerosol generating device (10). The aerosol generating device (10) can solve the problem of the temperature of the inner periphery and of the outer periphery not being uniform when an aerosol generating matrix is heated.