Air-Actuated Valve Switching for Cryogenic Liquid Temperature Stability
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Solution Overview
Problem
Cryogenic liquid switchover systems face challenges in maintaining a continuous supply with minimal temperature change, as existing systems struggle to seamlessly switch between supply sources while managing temperature and pressure variations effectively.
Innovation Solution
A novel algorithm utilizing temperature and pressure sensors to control four air-actuated valves, ensuring seamless switching between cryogenic fluid supply sources with minimal temperature change by monitoring and adjusting the operation of pneumatic valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional switching systems are used to switch between cryogenic fluid supply sources, then the switching operation can be completed, but temperature variations occur and continuous supply with minimal temperature change cannot be maintained
Solution Approach 1:
The system pre-cools the valve and piping components before switching occurs by maintaining a continuous flow of cryogenic fluid through the system. Temperature sensors detect temperature changes in advance, and the control algorithm prepares the secondary supply source beforehand, ensuring minimal temperature disruption when switching between sources.
Solution Approach 2:
Temperature sensors continuously monitor the cryogenic fluid temperature and supply source conditions. The control algorithm receives this feedback and dynamically adjusts valve positioning and switching timing to maintain optimal temperature stability, creating a closed-loop control system that responds to actual thermal conditions.
2Ease of operation
If manual switching between supply sources is performed, then system complexity is reduced, but seamless switching with minimal temperature change cannot be achieved
Solution Approach 1:
The system performs self-monitoring and self-regulation through automated temperature sensing and algorithmic control. The control mechanism automatically detects when switching is needed, actuates the valves, and maintains temperature stability without requiring manual intervention, making the system operate itself based on real-time conditions.
Solution Approach 2:
Manual mechanical switching operations are replaced with an automated electronic control system that uses temperature sensors, microprocessors, and electronic valve actuators. This substitution enables precise, seamless switching with minimal temperature disruption, though it increases device complexity.
3Reliability
If switching between supply sources occurs, then continuous supply can be maintained, but heat transfer increases and temperature stability deteriorates
Solution Approach 1:
The system maintains continuous flow of cryogenic fluid through the valve and piping even during switching operations. By keeping the fluid moving continuously rather than stopping and restarting, the system minimizes heat ingress from the environment and maintains thermal stability throughout the switching process.
Solution Approach 2:
The switching operation is executed rapidly using fast-acting pneumatic or electronic valves that can open and close in fractions of a second. This quick transition minimizes the duration of the switching event, reducing the total heat transfer that occurs during the transition between supply sources.
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 system provides a continuous supply of cryogenic fluid with minimal temperature change by using sensors to drive air-actuated valves, ensuring optimal delivery and minimizing heat transfer during switching, thus maintaining consistent cryogenic liquid supply.
Implementation Method 1
A temperature probe positioned adjacent to an exit of the cryogenic liquid input to measure the temperature of an incoming cryogenic liquid
Implementation Method 2
receiving inlet temperatures and inlet and outlet pressures
Implementation Method 3
four electronically controlled pneumatic valves
Data Source
AI summary
A cryogenic liquid switching system including an electronic control mechanism; a solenoid valve communicatively connected to the electronic control mechanism via an interface cable; a gas input control connected to the solenoid valve; and a pair of pneumatic valve actuators connected to the gas input control via separate isolation tubing components The system also including a pair of valve actuator pins, one each connected to a respective one of the pair of pneumatic valve actuators; a pair of pneumatic valves, one each connected to a respective one of the pair of valve actuator pins; and a cryogenic liquid input in fluid communication with at least a portion of each of the pair of pneumatic valves. The system further including a first cryogenic liquid output in fluid communication with a first of the pair of pneumatic valves; a second cryogenic liquid output in fluid communication with a second of the pair of pneumatic valves; and a temperature probe positioned adjacent to an exit of the cryogenic liquid input to measure the temperature of an incoming cryogenic liquid and send a signal to the electronic control mechanism to open and close the pneumatic valves based at least in part on the temperature of the incoming cryogenic liquid.