IPMC Micropump Low Voltage Actuation for Air Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional micropumps face challenges in creating forced air flow for consumer electronics, particularly in smart phones and portable sensors, due to high input voltages required by existing actuation mechanisms, and lack of investigation in this application area.
Innovation Solution
Development of an ionic polymer-metal composite (IPMC) based micropump that operates at low voltages, utilizing IPMC materials for actuation to create forced air flow, with features such as flexible configuration, large displacement, and high back pressures, suitable for particle sensing and gas sensing applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If piezoelectrically actuated diaphragms are used, then high actuation forces and fast mechanical responses are achieved, but high input voltages are required
Solution Approach 1:
The patent changes the actuation mechanism from piezoelectric to thermal, operating at different physical parameters (temperature vs. electrical field) to achieve low-voltage operation while maintaining pumping functionality
Solution Approach 2:
The patent replaces the piezoelectric mechanical actuation system with a thermopneumatic system that uses thermal expansion of gas to deform the diaphragm, eliminating the need for high input voltages
2Use of energy by moving object
If thermopneumatically activated diaphragms are used, then low input voltages and compact size are achieved, but long thermal time constants result
Solution Approach 1:
The patent integrates the heating element directly within the pump chamber structure, nesting the thermal actuation mechanism inside the pump body to reduce thermal mass and accelerate response time
Solution Approach 2:
The patent uses thin-film heating elements and flexible diaphragm structures that reduce thermal mass, enabling faster heating and cooling cycles while maintaining low operating voltages
3Speed
If electrostatically actuated diaphragms are used, then fast response times and low power consumption are achieved, but high input voltages are required
Solution Approach 1:
The patent replaces electrostatic actuation with thermopneumatic actuation, substituting electrical field-based mechanisms with thermal expansion mechanisms to achieve low-voltage operation
4Adaptability or versatility
If conventional micropumps are used, then liquid pumping is achieved, but forced air flow creation in consumer electronics is not addressed
Solution Approach 1:
The patent designs a universal micropump platform that can handle both liquid and gas media by optimizing the chamber geometry and membrane properties, enabling application in consumer electronics for air flow control in addition to traditional liquid pumping
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 IPMC micropump achieves efficient forced air flow with low voltage operation, providing great pumping force, large volume, and high displacement, making it suitable for consumer electronics, particularly in smart phones and portable sensors, with enhanced performance and ease of manufacturing.
Implementation Method 1
Ionic polymer-metal composites (IPMC) materials may require very low currents and voltages. Further, IPMC materials may operate in both air and liquid media
Data Source
Figure 1A~1C
Figure 2A~4C
Figure 5A~6C
AI summary
A micropump including a substrate and a membrane attached to the substrate. The membrane may be deformable away from the substrate to increase a volume enclosed by the substrate and the membrane, and a portion of the membrane may be configured to be an inlet for entry into the volume.