Pulse Tube Refrigerator DC Flow Control at the Cold End
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Solution Overview
Problem
Pulse tube refrigerators face reduced cooling performance due to increased heat entry at the low-temperature end from the high-temperature end, caused by the circulating DC flow within the regenerator and pulse tube.
Innovation Solution
A flow rate controller is implemented at the low-temperature end of the regenerator to control the flow rate of the DC flow, ensuring a greater flow rate from the regenerator to the pulse tube than from the pulse tube to the regenerator, thereby generating a DC flow from the low-temperature side to the high-temperature side, improving temperature distribution and cooling capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a DC flow circulates within the regenerator and pulse tube, then the refrigerant gas is transported through the system, but heat entry at the low-temperature end increases, reducing cooling performance
Solution Approach 1:
The invention extracts the harmful backflow of high-temperature refrigerant gas from the pulse tube to the regenerator by introducing a flow rate controller. This controller selectively allows the useful DC flow from regenerator to pulse tube while blocking the harmful reverse flow, thereby removing the source of heat entry at the low-temperature end and improving cooling performance.
2Productivity
If the flow rate of refrigerant gas is increased from regenerator to pulse tube, then cooling capability is improved, but the complexity of the system increases due to the flow rate controller
Solution Approach 1:
The flow rate controller acts as an intermediary device between the regenerator and the pulse tube. It mediates the refrigerant gas flow by selectively controlling the DC flow direction, enabling improved cooling capability while containing the complexity increase to a single localized component rather than the entire system.
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 enhances the cooling efficiency of the pulse tube refrigerator by preventing high-temperature refrigerant gas from flowing to the low-temperature end, resulting in improved temperature distribution and enhanced cooling performance.
Implementation Method 1
The flow rate controller is configured to control the flow rate of a first DC flow flowing from the regenerator toward the pulse tube and the flow rate of a second DC flow flowing from the pulse tube toward the regenerator
Implementation Method 2
Cooling is generated at the low-temperature side of the pulse tube by suitably controlling the phase difference between the pressure variation and the displacement of the refrigerant gas inside the pulse tube
Implementation Method 3
a regenerator to which a refrigerant gas is discharged from the compressor and from which the refrigerant gas returns to the compressor
Data Source
AI summary
A pulse tube refrigerator includes a compressor, a regenerator to which a refrigerant gas is discharged from the compressor and from which the refrigerant gas returns to the compressor, a pulse cube including a low-temperature end connected to the low-temperature end of the regenerator, and a flow rate controller provided at the low-temperature end of the regenerator. The flow rate controller is configured to control the flow rate of a first DC flow flowing from the regenerator toward the pulse tube and the flow rate of a second DC flow flowing from the pulse tube toward the regenerator, so that the flow rate of the first DC flow is greater than the flow rate of the second DC flow.