Microchannel Evaporator Unit with Bubble-Blocking Wick
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Solution Overview
Problem
Existing vaporizer units in electronic cigarettes face issues with uneven liquid distribution leading to dry puffs and bubble formation, which cause uneven heating and release harmful substances.
Innovation Solution
A wick structure with a gradient of pore/capillary size from large to small towards the heating element, combined with a clamping mechanism for the heating element, ensures even liquid distribution and prevents bubble penetration, maintaining consistent vaporization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a wick is used to supply liquid to the heating element, then liquid transport is achieved, but uneven liquid distribution and bubble formation occur leading to dry puffs
Solution Approach 1:
The patent employs a porous wick material with specifically controlled pore size (0.5-2 μm) to achieve capillary-driven liquid transport. The porous structure enables uniform liquid distribution across the heating element surface while preventing bubble penetration, thereby ensuring consistent vaporization without dry puffs
Solution Approach 2:
The wick is designed with non-uniform pore distribution and varying thickness in different regions to optimize liquid flow characteristics. The local structure is tailored to match the heating element geometry and liquid demand, ensuring uniform liquid supply across the entire heating surface while maintaining reliable vaporization
2Productivity
If the wick allows free liquid flow, then liquid supply is sufficient, but bubbles penetrate into the inlet area causing dry running
Solution Approach 1:
The porous wick material with controlled pore size (0.5-2 μm) acts as a bubble barrier while maintaining liquid permeability. The pore structure allows liquid to pass through via capillary action but blocks larger vapor bubbles from penetrating into the inlet area, preventing dry running conditions
Solution Approach 2:
The wick structure converts the potentially harmful effect of bubble formation by trapping bubbles within the porous matrix. Instead of allowing bubbles to reach the inlet area and cause dry running, the porous structure captures and contains bubbles, transforming them from harmful defects into contained features that do not interfere with liquid supply
3Ease of manufacture
If the wick structure is simple, then manufacturing is easy, but uneven wetting and temperature distribution occur
Solution Approach 1:
The wick is designed with spatially varying properties including non-uniform pore size distribution and varying thickness in different regions. This local differentiation ensures uniform liquid distribution and even wetting across the heating element surface while maintaining manufacturability through established porous material fabrication techniques
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 solution prevents dry puffs and uneven heating, ensuring consistent and pollutant-free vapor generation by stabilizing the liquid flow and bubble containment.
Implementation Method 1
The liquid is typically supplied to the radiator via capillary action using a wick
Implementation Method 2
the heating element is configured to vaporize liquid conveyed through the microchannels by applying a heating voltage
Implementation Method 3
the heating element is configured to vaporize liquid conveyed through the microchannels
Data Source
Figure 1~2
Figure 3~6
Figure 7
AI summary
The invention relates to an evaporator unit (20) for an inhaler, in particular for an electronic cigarette product, comprising an electrically operatable heating body (60), in particular a flat heating body, which has an inlet side (61) and an outlet side (64), and a plurality of microchannels (62), each of which extends from the inlet side (61) to the outlet side (64) through the heating body (60). The heating body (60) is designed to evaporate liquid being transferred through the microchannels (62) by applying a heating voltage. A porous and/or capillary wick structure (19) is arranged on the inlet side (61) of the heating body (60), said wick structure lying flatly against the heating body (60) in a contacting manner and covering all of the microchannels (62) on the inlet side (61).