E-Cigarette Capsule Capillary Wick Droplet Control
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Solution Overview
Problem
Electronic cigarettes often produce unvaporized liquid droplets that can be unpleasant for users to inhale, as the heater can cause part of the liquid to boil instead of vaporize, leading to larger droplets escaping through the mouthpiece, and existing solutions like meshes do not effectively address this issue without compromising vapor flow.
Innovation Solution
The capsule design includes a vaporizing unit with a heater positioned adjacent to the liquid inlet, utilizing capillary action to regulate the liquid supply and prevent excessive liquid from reaching the vaporizing chamber, along with a housing structure that maintains negative pressure and efficient liquid distribution, ensuring efficient vaporization and minimizing droplet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a mesh is provided in the mouthpiece to prevent larger particles from reaching the user's mouth, then droplet size is reduced, but vapor flow is restricted
Solution Approach 1:
The harmful function of the mesh (restricting flow) is extracted and replaced by addressing the root cause - excessive liquid supply to the heater. The solution removes the need for flow-restricting meshes by implementing capillary wick control and heater positioning that prevents droplet formation at the source, thereby maintaining unrestricted vapor flow while eliminating large droplets.
Solution Approach 2:
A capillary wick is introduced as an intermediary element between the liquid reservoir and the heater. This wick mediates liquid transport through capillary action, controlling the liquid supply rate to prevent overheating and droplet formation, thereby solving the droplet issue without requiring flow-restricting meshes in the mouthpiece.
2Temperature
If the heater heats up the liquid excessively, then vaporization occurs, but large droplets are formed and escape through the mouthpiece
Solution Approach 1:
The capillary wick performs preliminary action by controlling and regulating liquid supply to the heater before excessive heating occurs. By limiting the liquid flow rate through capillary forces, the system prevents the heater from overheating and forming large droplets, maintaining optimal vaporization temperature without droplet formation.
Solution Approach 2:
The capillary wick provides self-regulating liquid supply to the heater based on its inherent capillary properties. The wick automatically adjusts liquid flow to match heating demands without external control, preventing both insufficient vaporization and excessive droplet formation, thereby self-managing the temperature-droplet contradiction.
3Object-affected harmful factors
If the openings in the mesh are reduced to decrease droplet size, then droplet filtration improves, but flow restriction increases
Solution Approach 1:
The complex flow-restricting mesh structure is extracted and replaced by a simpler capillary wick system that controls droplet size at the source. By regulating liquid supply through capillary action, the system achieves droplet size control without requiring complex mesh structures with restricted openings, thereby reducing device complexity and maintaining free vapor flow.
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 significantly reduces the formation of liquid projections by improving vaporization capabilities, ensuring that more liquid is vaporized rather than boiled, resulting in a smoother inhalation experience with reduced droplet size and enhanced vapor flow.
Implementation Method 1
the fluid transfer element provides a capillary action on liquid received therein
Implementation Method 2
Vaporization is achieved by a vaporizer or heater unit which typically comprises a heating element in the form of a heating coil and a fluid transfer element. The vaporization occurs when as the heater heats up the liquid in the wick until the liquid is transformed into vapor.
Data Source
AI summary
A capsule for an electronic cigarette has a first end for engaging with an electronic cigarette device and a second end configured as a mouthpiece portion having a vapor outlet, the capsule further including a liquid store configured to contain a liquid to be vaporized, a vaporizing unit including a heater and a fluid transfer element, the vaporizing unit being arranged within a vaporizing chamber, a main vapor channel extending from the vaporizing chamber to the vapor outlet in the mouthpiece, and a housing enclosing the liquid store and the vaporizing unit, wherein the housing includes inner and outer housings that are assembled together, wherein the liquid store is located in a void in-between the inner and outer housings, wherein a seal is provided between the inner and outer housings, and wherein the seal has a cross-sectional shape having a cross-sectional height that is larger than a cross-sectional width.