Membrane-Based Micro Airflow Generator for Compact PM Sensors
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Solution Overview
Problem
Compact optical PM sensors face challenges in generating reliable airflow due to the bulkiness, noise, and limited lifespan of fans, and the inefficiency and high power consumption of heaters, while conventional pumps are too large for effective use in these sensors.
Innovation Solution
A micro airflow generator using a pump housing with a diffusion channel, valvular conduit, and an actuator-driven membrane to generate airflow, which is compact, reliable, and energy-efficient, eliminating the need for fans or heaters, and incorporating features like ultrasonic frequency operation to prevent noise and dust accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fan is used to generate airflow, then airflow is provided for particle detection, but the device becomes bulky, noisy, and has limited lifespan
Solution Approach 1:
The patent replaces the mechanical fan system with an electrostatic field-based airflow generation system. Two electrodes generate an electrostatic field that directly acts on airborne particles, eliminating the need for mechanical moving parts while maintaining particle detection capability. This substitution resolves the contradiction by providing reliable airflow generation without the bulk and noise associated with traditional fans.
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical rotation (fan speed) to electrostatic field strength (voltage). By applying high voltage to the electrodes, the system generates electrostatic forces that move particles through the detection chamber without requiring mechanical airflow generation, thus achieving compact size while maintaining detection reliability.
2Reliability
If a heater is used to generate airflow, then airflow is provided, but power consumption increases and efficiency decreases
Solution Approach 1:
The patent replaces the thermal convection system (heater) with an electrostatic field system. Instead of heating air to create convection currents, the electrostatic field directly exerts force on charged particles, moving them through the detection chamber. This substitution dramatically reduces power consumption while maintaining reliable particle transport, as electrostatic forces are more energy-efficient than thermal convection for this application.
3Reliability
If conventional pumps are used to generate airflow, then reliable airflow is provided, but the device is too large for compact sensors
Solution Approach 1:
The patent replaces mechanical pumps with an electrostatic field-based system. The electrostatic field generates body forces that directly move particles through the fluid without requiring mechanical pumping action. This eliminates the need for bulky pump mechanisms while maintaining reliable particle transport, enabling compact sensor design.
Solution Approach 2:
The patent utilizes the electrostatic field as a non-mechanical means to generate fluid motion. By creating an electrostatic field between electrodes, the system generates forces that act on the fluid-borne particles, inducing their movement through the detection chamber without mechanical contact or moving parts, thus achieving pump-like functionality in a compact form.
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 micro airflow generator provides a reliable, quiet, and energy-efficient airflow solution for compact optical PM sensors, ensuring effective particulate matter detection with reduced size and power consumption, enhancing the overall reliability and efficiency of the sensor system.
Implementation Method 1
incorporating features like ultrasonic frequency operation to prevent noise and dust accumulation
Implementation Method 2
optical scattering particle detection module
Data Source
AI summary
Disclosed embodiments may relate generally to a micro airflow generator which does not use fan(s) or a heater to generate airflow (for example in a compact optical PM sensor). Rather, disclosed embodiments typically may use induced movement of a membrane/diaphragm element to generate air flow (wherein movement of the membrane in turn induces movement in air). For example, a membrane or diaphragm element could be driven by an (electronic) actuator element, such as an electro-magnetic actuator or piezo disc bender (or some other means of vibrating/moving the membrane element in a way which induced airflow). In some embodiments, the electro-magnetic actuator itself may include a membrane (such that the electro-magnetic actuator might encompass the membrane and the electronic actuator element, such as a magnet and corresponding coil) and/or the piezo disc bender might serve as both the membrane/diaphragm and the electronic actuator element.