Liquid Metal Thermal Switch for Precise Heat Conduction Control
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Solution Overview
Problem
Existing thermal control systems face limitations in efficiency, rate of temperature change, maximum heat load, and precision due to an inability to effectively control thermal conduction, particularly in systems with fluctuating heat loads or requiring precise temperature control.
Innovation Solution
A thermal switch utilizing a liquid metal interface with a movable actuator that controls the flow of thermally conductive liquid between plates, allowing for precise, rapid, and proportional control of thermal conduction, with a rangeability of up to 600:1, and supporting structural loads without external movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal conduction is controlled by physical contact between surfaces or gas pressure manipulation, then thermal switching function is achieved, but thermal performance and reliability are compromised
Solution Approach 1:
The patent employs a liquid metal (gallium) that flows between thermal contact surfaces under pressure differential control. By using hydraulic principles to manipulate the liquid metal's position, the system achieves reliable thermal switching without complex mechanical moving parts, seals, or gas pressure systems, thereby improving reliability while avoiding excessive structural complexity.
Solution Approach 2:
The patent changes the physical state and position of the liquid metal thermal conductor by applying pressure differentials. When pressure differential exceeds a threshold, the liquid metal flows to establish or break thermal contact, enabling thermal switching through parameter change rather than mechanical movement, thus improving reliability.
2Productivity
If conventional thermal control methods are used with fixed thermal couplings, then system simplicity is maintained, but efficiency and rate of temperature change are limited
Solution Approach 1:
The patent transforms the fixed thermal coupling into a dynamic system where the liquid metal can continuously adjust its position and contact pressure in response to pressure differential changes. This dynamic capability enables rapid temperature changes and improved thermal control efficiency without requiring complex multi-component mechanisms.
Solution Approach 2:
The liquid metal automatically flows to or from thermal contact surfaces in response to pressure differential changes, providing self-regulating thermal control. This eliminates the need for external actuators or complex control mechanisms, achieving high productivity with minimal added complexity.
3Measurement precision
If thermal switches make and break physical contact between surfaces, then thermal conduction is controlled, but thermal performance and precision are reduced
Solution Approach 1:
The patent uses liquid metal under pressure differential control to establish consistent thermal contact, replacing unreliable mechanical switching. The hydraulic control provides precise and repeatable contact pressure, improving both temperature control precision and contact reliability without requiring perfect mechanical alignment or sealing.
4Manufacturing precision
If liquid metal is used to control thermal conduction, then precise and rapid thermal control is achieved, but device complexity increases
Solution Approach 1:
The patent uses a simple pressure differential mechanism to control liquid metal flow, achieving precise thermal control without complex mechanical structures. The hydraulic principle allows precise control of contact pressure and flow rate using basic pressure sources, maintaining structural simplicity while achieving high manufacturing precision.
Solution Approach 2:
The patent achieves precise temperature control by changing the pressure differential parameter, which directly controls the liquid metal's flow and contact pressure. This single-parameter control method provides precise thermal regulation without requiring complex multi-parameter 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 solution enables improved efficiency and reliability in thermal control systems by providing precise and rapid control of thermal conduction, accommodating fluctuating heat loads and ensuring high precision, while maintaining structural integrity and ease of implementation.
Implementation Method 1
a channel defining a gap between the first and second plate... thermally conductive liquid is allowed to flow from the reservoir to the channel and from the channel to the heat source or heat sink
Data Source
AI summary
A thermal switch having an on-state and an off-state is provided. First and second plates are composed from a thermally conductive material. The first and second plates are connected to form an internal cavity having a channel defining a gap between the first and second plate. The first reservoir is coupled to the channel and contains a thermally conductive liquid. The actuator is coupled to the first reservoir and the channel and is moveable between a first state and a second state corresponding to the on-state and the off-state of the thermal switch, respectively. Thermally conductive liquid is allowed to flow from the first reservoir to the channel when the actuator is in the first state and allowed to flow from the channel to the first reservoir when the actuator is in the second state.