Shape Memory Valve Actuator for Reliable One-Time Activation
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Solution Overview
Problem
In space travel applications, existing valves for liquid or gaseous media require reliable and low-leakage solutions for opening and closing, especially in high-reliability drive systems where malfunctions can cause substantial damage, and current technologies lack efficient once-only activation mechanisms.
Innovation Solution
A device utilizing a shape memory actuator that changes its external shape abruptly at a transformation temperature, achieved through electrical heating, to irreversibly activate the valve, with a simple mechanical structure and minimal components, ensuring reliable operation without additional elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve actuation mechanisms are used, then the valve can be opened or closed, but the structure becomes complex and weight increases
Solution Approach 1:
The patent extracts and eliminates intermediate mechanical transmission components from conventional valve actuation systems. By directly coupling the shape memory alloy actuator to the valve mechanism, it removes complex gears, linkages, and transmission elements, achieving reliable activation with minimal components.
Solution Approach 2:
The patent replaces traditional mechanical actuation systems with a shape memory alloy-based thermal-mechanical system. Electrical heating elements convert electrical energy to thermal energy, which triggers the phase transformation in the SMA material, generating mechanical force directly without mechanical transmission components.
2Reliability
If additional activation elements are added to ensure reliable activation, then activation reliability improves, but device complexity and weight increase
Solution Approach 1:
The patent utilizes parameter changes in the shape memory alloy material, specifically the phase transformation temperature. By controlling the heating temperature to exceed the transformation point, the material undergoes a reversible phase change that generates mechanical motion, achieving reliable activation through material property manipulation rather than additional components.
Solution Approach 2:
The patent exploits the phase transition characteristics of shape memory alloys. The material transforms from austenite to martensite phase upon cooling and reverses upon heating, generating controlled mechanical deformation. This phase transition mechanism provides reliable, repeatable activation without requiring multiple actuators or complex 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
The device provides reliable once-only activation of the valve with low leakage rates, reduced weight, and flexible configuration options, addressing the high reliability needs of space travel applications by using a shape memory actuator to generate forces for opening or closing the valve, similar to pyrotechnic valves but with improved safety and reduced shock loads.
Implementation Method 1
a shape memory actuator is provided for once-only activation of the valve, the memory actuator changes its external shape abruptly when a transformation temperature is reached which is dependent upon its alloy composition
Implementation Method 2
The transformation temperature can be generated by a controllable electrical heating device of the device
Data Source
AI summary
A device for opening or closing a seal seat of a valve arranged in a pipe for liquid or gaseous media includes a one-time only activation of the valve using a shape memory actuator. The shape memory actuator changes its external shape abruptly when a transformation temperature is reached that is dependent upon its alloy composition. The transformation temperature can be generated by a controllable electrical heating device of the device.