Heat Flux-Responsive Plug for Pressure Relief Vent
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Solution Overview
Problem
Pressure-relief valves in pressurized vessels complicate testing and qualification by activating or being compromised during testing, as they open at lower pressures than the standard against which the vessel is tested, disrupting the testing objective.
Innovation Solution
A heat flux-responsive plug made of a eutectic alloy, thermally isolated from the vessel, seals the vent in a solid phase and opens it in a liquid phase, selectively responding to target temperature and heat flux, ensuring rapid response to external temperature increases and maintaining sealing integrity under high pressure environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure-relief valve is used in a pressurized vessel, then the vessel can be protected from overpressurization, but the valve activates during testing at pressures below the test standard, complicating testing and qualification
Solution Approach 1:
The patent changes the activation parameter from pressure-based to temperature/heat flux-based. The plug material's melting temperature is selected to correspond to the target temperature, allowing the vent to remain closed during pressure testing while still providing overpressurization protection through thermal activation in actual fire or overheating scenarios.
Solution Approach 2:
The patent replaces the mechanical pressure-responsive valve system with a thermal-responsive plug system. Instead of using a mechanical valve that opens at a predetermined pressure, the invention uses a heat flux-responsive plug that melts at a specific temperature, substituting mechanical pressure sensing with thermal sensing and phase change mechanics.
2Reliability
If a pressure-relief valve opens at a lower pressure than the test standard, then the vessel can be protected during normal operation, but the valve may be activated or compromised during testing, frustrating the objective of the testing
Solution Approach 1:
The patent changes the activation parameter from pressure to temperature. By selecting a plug material with a melting temperature corresponding to the target temperature, the vent activates only when thermal conditions reach the fire or overheating threshold, not during routine pressure testing. This resolves the conflict between operational safety and test qualification accuracy.
Solution Approach 2:
The patent utilizes the phase transition (melting) of the plug material at a specific temperature. The plug is formed of a material that melts at a temperature corresponding to the target temperature, causing the vent to open only under thermal stress conditions such as fire or overheating, while remaining sealed during normal pressure operations and testing.
3Productivity
If a heat flux-responsive plug is used instead of a pressure-responsive valve, then testing can proceed without premature activation, but the device must respond to thermal conditions rather than pressure directly
Solution Approach 1:
The patent substitutes thermal response mechanisms for mechanical pressure response. The heat flux-responsive plug provides a simple, reliable activation mechanism that responds directly to thermal conditions through phase change, eliminating the complexity of pressure sensing and mechanical valve actuation while improving testing efficiency.
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 allows for accurate and reliable pressure-relief without premature activation, ensuring the vessel meets performance standards by isolating thermal responses and using a phase-change material to control vent opening, effectively addressing the testing complications caused by traditional pressure-responsive valves.
Implementation Method 1
the plug seals the vent passage in a solid phase and opens it in a liquid phase
Implementation Method 2
A heat flux-responsive plug made of a eutectic alloy, thermally isolated from the vessel, seals the vent in a solid phase and opens it in a liquid phase, selectively responding to target temperature and heat flux
Implementation Method 3
the plug is formed of a eutectic alloy
Data Source
Figure 1~3
Figure 4~5
AI summary
An article (20) includes a vessel (22), a vent (24) connected to the vessel (22), and a heat flux-responsive plug (34) disposed in the vent (24) and thermally isolated from the vessel (22). The heat flux-responsive plug (34) may have a material selected based on a phase change characteristic.