Cryogenic system and control method for cryogenic system
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Solution Overview
Problem
Existing cryogenic systems face challenges in efficiently cooling cryogenic systems due to the risk of temperature rise in cooling stages caused by input heat to the heat absorbing portion.
Innovation Solution
A cryogenic system incorporating a cryocooler with a heat absorbing portion and a controller that acquires temperature measurements from multiple sensors to set an upper limit temperature for the heat absorbing portion, thereby controlling the heat source to maintain the temperature at or below this limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat is input to the heat absorbing portion to utilize its cooling capacity, then the cooling efficiency of the cryogenic system is improved, but the temperature of the cooling stages may rise excessively
Solution Approach 1:
The patent implements a feedback control mechanism where temperature sensors continuously monitor the temperature at multiple positions (including the heat absorbing portion and cooling stages), and the controller adjusts the heat input to the heat absorbing portion based on these measurements to maintain temperatures within desired ranges, thus resolving the contradiction between utilizing cooling capacity and preventing excessive temperature rise
Solution Approach 2:
The system dynamically changes operational parameters (heat input level to the heat absorbing portion) based on real-time temperature conditions, adjusting the degree of heat input to optimize cooling efficiency while preventing temperature rise in cooling stages, thereby resolving the technical contradiction
2Measurement precision
If temperature sensors are placed at multiple positions to monitor temperature distribution, then the control precision is improved, but the device complexity increases
Solution Approach 1:
The patent divides the temperature monitoring function into multiple segments by placing temperature sensors at different critical positions (heat absorbing portion, cooling stages, and intermediate positions), allowing precise temperature measurement at each location independently, which enables targeted control without requiring a single complex monitoring system
Solution Approach 2:
The temperature sensors serve multiple functions: they monitor temperatures for control decisions, detect abnormal conditions, and provide data for optimizing heat input distribution, thereby justifying the added device complexity through enhanced measurement precision and control capabilities
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 configuration allows for more efficient cooling of the cryogenic system by utilizing the cooling capacity of the heat absorbing portion while preventing excessive temperature rise in the cooling stages.
Implementation Method 1
a first temperature sensor measuring a first measurement temperature in one axial end portion of the second cylinder close to the first cylinder
Implementation Method 2
a second temperature sensor measuring a second measurement temperature in the other axial end portion of the second cylinder far from the first cylinder
Implementation Method 3
a third temperature sensor measuring a third measurement temperature in the heat absorbing portion
Implementation Method 4
a heat absorbing portion thermally connected to a heat source in an axial intermediate portion of the second cylinder
Data Source
AI summary
A cryogenic system includes a cryocooler and a controller. The cryocooler includes a first cylinder, a second cylinder including a heat absorbing portion, a first temperature sensor measuring a first measurement temperature, a second temperature sensor measuring a second measurement temperature, and a third temperature sensor measuring a third measurement temperature. The controller is configured to acquire a first measurement temperature from the first temperature sensor, a second measurement temperature from the second temperature sensor, and a third measurement temperature from the third temperature sensor, to set an upper limit temperature of the heat absorbing portion, based on the first measurement temperature, the second measurement temperature, and an axial position of the heat absorbing portion, and to control the heat source such that the third measurement temperature is equal to or lower than the upper limit temperature of the heat absorbing portion.