Magnetic Airflow Sensing Membrane for Compact High-Temperature Control
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Solution Overview
Problem
Conventional airflow rate sensing and controlling modules are difficult to install in small devices due to their large size and are affected by high temperatures, and existing control mechanisms like spring valves and movable valves suffer from elastic fatigue and installation challenges in micro channels.
Innovation Solution
A sensing and controlling module comprising a tube with an airflow channel, sensing and controlling membranes, coils, and a magnetic unit, allowing for simultaneous airflow sensing and control with independent assemblies that can operate in high-temperature environments and are compact enough for small devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezoelectric units are used for pressure detection, then sensing function is achieved, but the device becomes unsuitable for high temperature environments and produces inaccurate data
Solution Approach 1:
The patent replaces piezoelectric units with a magnetic field-based sensing system. A magnetic sensor detects changes in magnetic flux caused by displacement of a magnetic diaphragm, eliminating mechanical piezoelectric elements that fail under high temperature. This substitution maintains sensing accuracy while removing temperature sensitivity constraints.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between pressure detection and signal generation. The magnetic diaphragm transmits mechanical displacement to the magnetic sensor through magnetic field interaction rather than direct piezoelectric conversion, enabling high temperature operation while preserving sensing function.
2Reliability
If spring valves or movable valves are used for airflow control, then controlling function is achieved, but the device structure becomes complicated and difficult to install in micro channels
Solution Approach 1:
The patent combines the sensing diaphragm and controlling diaphragm into a single integrated membrane structure. The same flexible membrane serves both as the sensing element that detects pressure changes and as the controlling element that regulates airflow, eliminating the need for separate spring valves or movable valves and simplifying the overall device structure.
Solution Approach 2:
The flexible membrane performs multiple functions simultaneously: it acts as a pressure sensing element, a flow control valve, and a mechanical actuator. This multi-functionality replaces complex dedicated components with a single universal element suitable for micro channel integration.
3Reliability
If conventional airflow sensing and controlling modules are used, then sensing and controlling functions are achieved, but the device size becomes large and difficult to install in small devices
Solution Approach 1:
The patent merges the airflow sensing module and airflow controlling module into a single integrated assembly. Both functions share common components including the flexible membrane, magnetic field elements, and housing structure, significantly reducing the overall volume compared to separate conventional modules while maintaining full sensing and controlling capabilities.
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
Enables precise airflow rate sensing and control in small devices without the limitations of high temperatures and complex installations, providing accurate data and simplified structure for easier installation and maintenance.
Implementation Method 1
The sensing coil is adhered to and spread on the surface of the sensing membrane... the sensing coil and the controlling coil are both provided with two ends respectively connected to a controlling unit
Implementation Method 2
The controlling coil is adhered to and spread on the surface of the controlling membrane... the magnetic unit is disposed at a spaced interval from the sensing membrane, and the magnetic unit is disposed at a spaced interval from the controlling membrane
Data Source
AI summary
A sensing and controlling module of airflow for an active aerosol suction device has a tube, a sensing membrane, a sensing coil, a controlling membrane, a controlling coil, and a magnetic unit. The sensing membrane is mounted in the tube. The controlling membrane is disposed at an air inlet of the tube. The sensing membrane and the controlling membrane are capable of bending deformation. The sensing coil is adhered to and spread on the surface of the sensing membrane, and the controlling coil is adhered to and spread on the surface of the controlling membrane. The magnetic unit is disposed at a spaced interval from the sensing membrane and the controlling membrane. With the sensing membrane and the controlling membrane, the sensing and controlling module is capable of sensing and controlling airflow rate.