Piezoelectric Puff Sensing Vent Layout for Aerosol Generators
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Solution Overview
Problem
Existing aerosol generating devices suffer from reduced puff sensing accuracy and reliability due to interference from aerosol and droplets generated during operation, affecting the performance of conventional pressure sensors.
Innovation Solution
The device incorporates a piezoelectric pressure sensor positioned adjacent to an airflow passage with a diagonally oriented vent hole, connected to the airflow passage, to accurately measure pressure variations and reduce electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a general pressure sensor is used to detect user inhalation, then the device can sense puff actions, but the sensing accuracy and reliability degrade due to aerosol and droplets generated during operation
Solution Approach 1:
The patent introduces a vent hole as an intermediary element that connects the airflow passage to the chamber containing the piezoelectric pressure sensor. This intermediary structure allows the sensor to indirectly detect pressure variations caused by user inhalation while being physically isolated from the aerosol and droplets in the main airflow passage, thus maintaining both accuracy and reliability
Solution Approach 2:
The patent replaces conventional pressure sensors with a piezoelectric pressure sensor that detects mechanical pressure variations through piezoelectric effect. This substitution provides more robust and linear sensing characteristics that are less susceptible to degradation from environmental contaminants like aerosol and droplets, thereby improving both measurement precision and reliability
2Measurement precision
If a piezoelectric pressure sensor is used, then robust puff sensing with excellent linearity is achieved, but the device complexity increases
Solution Approach 1:
The piezoelectric pressure sensor serves multiple functions: it detects pressure variations for puff sensing, provides robust linearity across usage frequencies and amplitudes, and inherently resists electromagnetic interference. By consolidating these functions into a single sensor component, the patent achieves high measurement precision without proportionally increasing overall device complexity
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 provides robust puff sensing with improved linearity across various frequencies and amplitudes, minimizing interference from electromagnetic fields and enhancing measurement reliability.
Implementation Method 1
a piezoelectric pressure sensor arranged adjacent to a portion of the airflow passage and fluid-connected to the airflow passage through a vent hole
Data Source
AI summary
An aerosol generating device according to an embodiment includes a housing including an accommodation portion into which a cigarette is inserted and an airflow passage fluid-connected to the accommodation portion, a piezoelectric pressure sensor arranged adjacent to a portion of the airflow passage and fluid-connected to the airflow passage through a vent hole, and a processor configured to calculate a pressure variation in the airflow passage by using the piezoelectric pressure sensor. The vent hole extends diagonally with respect to a surface of a piezoelectric element of the piezoelectric pressure sensor.