Microscale Combustion Actuator With Membrane Pressure Drive
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Solution Overview
Problem
High-density mechanical actuation systems are challenging to realize due to the large size of valves and mechanical components, making them unsuitable for compact applications, and existing fluidic actuators require external pressure sources and complex control mechanisms.
Innovation Solution
The development of a microscale actuator with a combustion chamber, a membrane, an inlet channel, an outlet channel, and an ignitor, where a combustible gas is ignited to generate pressure for actuation, allowing for internal energy sourcing and simplified control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If valves and mechanical components are used to control motion in actuation systems, then motion control is enabled, but the system size increases and high-density actuation becomes difficult
Solution Approach 1:
The patent removes valves and complex mechanical control components from the actuation system. Instead, it uses fluidic logic where compressed gas flows through passive restrictors and channels to control multiple actuators, eliminating the need for traditional mechanical valves and reducing system complexity while maintaining motion control capability
Solution Approach 2:
The patent replaces mechanical control systems with a fluidic control system. Compressed gas serves as the control medium, flowing through passive restrictors and fluidic channels to actuate multiple actuators without mechanical contact, thereby reducing mechanical complexity and enabling higher density actuation
2Ease of operation
If external pumping mechanisms are used to generate fluid pressure, then actuation force is provided, but system complexity and portability are reduced
Solution Approach 1:
The system uses internally stored compressed gas as the actuation source. The compressed gas reservoir provides both the actuation force and the control pressure needed to operate multiple actuators, eliminating the need for external pumps and complex control mechanisms while improving portability
Solution Approach 2:
The compressed gas serves multiple functions simultaneously: it provides actuation force to move membranes, generates control pressure for fluidic logic operations, and enables passive flow restriction through restrictors. This multi-functionality eliminates the need for separate external pumping and control systems
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
This solution enables a high-energy actuation system with reduced complexity, eliminating the need for external pressure sources and allowing for compact, portable, and cost-effective actuation, suitable for applications like refreshable braille displays.
Implementation Method 1
an ignitor operable to ignite a combustible gas contained within the combustion chamber
Implementation Method 2
The electrode may comprise at least two electrode channels, each having an end separated by a spark gap
Data Source
AI summary
Disclosed herein are actuators and methods of making and actuating the same. Such actuators may comprise a body having a cavity, a membrane configured to cooperate with the cavity to form a combustion chamber, an inlet channel in fluid communication with the combustion chamber, an ignitor operable to ignite a combustible gas contained within the combustion chamber, and an outlet channel in fluid communication with the combustion chamber. The membrane may be configured to move in response to a change in pressure within the combustion chamber.