Graphene Drum Pump System for High Vacuum and MHz Operation
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Solution Overview
Problem
Conventional pump and engine systems using MEMS-fabricated microvacuum pumps with thick diaphragms are limited by slow operation, high voltage requirements, and inability to maintain high vacuum, leading to inefficiencies and wear due to repeated physical contact with other parts.
Innovation Solution
The use of graphene drums or atomically thin electrically conductive membranes in pump and engine systems, which operate at higher frequencies, reduce the need for physical contact, and maintain high vacuum without oil, enabling higher power density, efficiency, and precise fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional MEMS-fabricated microvacuum pumps with thick diaphragms are used, then structural strength and sealing are improved, but operation speed decreases and high voltage is required
Solution Approach 1:
The patent changes the fundamental parameter of diaphragm thickness from conventional thick diaphragms to atomically thin graphene drums. This parameter change enables the diaphragm to operate at MHz frequencies while maintaining sufficient strength through the unique mechanical properties of graphene, resolving the contradiction between strength and speed.
Solution Approach 2:
The patent employs graphene, a composite material with exceptional strength-to-thickness ratio, to create diaphragms that are both ultra-thin for high-speed operation and sufficiently strong for structural integrity. The graphene drum combines atomic-level thinness with remarkable mechanical strength.
2Reliability
If conventional thick diaphragms are used, then manufacturing reliability is improved, but physical contact wear increases
Solution Approach 1:
The patent replaces the mechanical contact-based valve system with an electrically controlled graphene drum system. The graphene drum acts as both piston and valve, controlled by electric fields rather than mechanical contact, eliminating wear from repeated physical contact while maintaining manufacturing reliability through established graphene fabrication processes.
3Quantity of substance
If conventional pumps are used, then fluid flow capacity is improved, but device size increases
Solution Approach 1:
The patent segments the pump into multiple graphene drum units that can operate in parallel or series configurations. This segmentation allows the system to achieve high fluid flow capacity through collective action of multiple small drums, maintaining compact device size while increasing overall pumping capability.
Solution Approach 2:
The patent employs a nested configuration where graphene drums are integrated within multi-cavity structures. Multiple functional elements are nested within each other, allowing high fluid flow capacity to be achieved within a compact volume by maximizing space utilization through nested arrangements.
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
Graphene drum systems achieve higher power density, efficiency, quiet operation, and smaller size by operating at MHz frequencies and maintaining high vacuum without physical contact, overcoming limitations of conventional systems.
Implementation Method 1
The cavity has an electrically conductive drum operable to change the volume capacity of the cavity
Data Source
AI summary
Pump systems having electrically conductive membranes are described. In embodiments of the invention, the electrically conductive membranes can be utilized as speakers to produce ultrasonic and audible sounds. The electrically conductive membranes are made from materials such as graphene, graphene oxide, and polymer films having a thin conductive coating.