Pulse Tube Refrigerator Gas Distribution With Eight-Valve Phase Control
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Solution Overview
Problem
The performance of pulse tube refrigerators is easily influenced by environmental temperature changes and operational conditions, leading to unstable refrigeration temperatures and inefficiencies due to the inability to actively regulate gas flow and phase at the cold end, where no moving components are present.
Innovation Solution
An automatic gas flow and phase regulating device with eight independent valves controlled by a drive controller, connected to temperature sensors, allowing for real-time regulation of valve open/close times, sequences, and degrees to optimize gas flow and phase within the pulse tube refrigerator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional plane rotary valves are used for gas distribution, then the structure is simple and easy to manufacture, but the gas flow and phase cannot be actively regulated when working conditions change
Solution Approach 1:
The air distribution valve is divided into eight independent valves instead of a single rotary valve, allowing each valve to be controlled independently for precise regulation of gas flow and phase to different components (heat regenerator, pulse tube, air reservoirs) based on working conditions
Solution Approach 2:
The valve system transitions from a static rotary valve design to a dynamic electronically-controlled system where the open/close time, sequence, and degree of each valve can be actively adjusted in response to changing working conditions, environmental temperature, and impurity levels
2Temperature
If the refrigerator operates without active gas regulation, then the device complexity is reduced, but the refrigeration temperature stability deteriorates under environmental temperature changes
Solution Approach 1:
Temperature sensors are installed at the bottom parts of both heat regenerators to detect refrigeration temperature in real-time, and this feedback information is used by the drive controller to automatically adjust the valve operations, maintaining optimal gas flow and phase relationships despite environmental temperature changes
Solution Approach 2:
The system automatically regulates its own gas flow and phase parameters through the drive controller and temperature sensors, enabling self-optimization of refrigeration performance without external intervention, adapting to changing working conditions and impurity levels
3Ease of operation
If eight independent valves are used instead of traditional rotary valves, then the gas flow and phase can be independently controlled, but the device complexity increases
Solution Approach 1:
Each of the eight valves is designed to perform multiple functions: controlling gas flow to different components (heat regenerator, pulse tube, air reservoirs), regulating phase relationships, and adapting to various working conditions, thereby reducing the need for separate specialized components
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 solution enables the pulse tube refrigerator to maintain optimal operating conditions and enhance refrigeration temperature stability and efficiency by independently controlling gas flow and phase, overcoming limitations of traditional rotary valves.
Implementation Method 1
The gas is extruded and enable the gas temperature in the closed end of the pulse tube to reach the maximum value... The water cooler installed in the closed end of the pulse tube takes the heat away so as to reduce the temperature of the gas in the tube to the original temperature when entering the heat regenerator
Implementation Method 2
The expanded low pressure gas flows through the heat regenerator reversely, absorbs the heat in the filler, goes back to the compressor inlet and finishes a circulation
Implementation Method 3
the gas in the pulse tube is expanded to generate refrigeration effect, the temperature of the gas is reduced to the minimum temperature
Data Source
AI summary
A pulse tube refrigerator with an automatic gas flow and phase regulating device is composed by a helium compressor, an air distribution valve, a drive controller, a drive lead, a temperature sensor, a temperature measuring lead, a heat regenerator, a first-stage pulse tube, a second-stage pulse tube, a first-stage air reservoir and a second-stage air reservoir, wherein the air distribution valve is consisted of eight independent valves. According to received temperature signals from the temperature sensors the drive controller transmits order signals to the eight independent valves so as to control the open/close degree, time and sequence of the eight valves of the air distribution valve.