Cryocooler Expansion Space Annular Structure for Lower Pressure Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cryocoolers, such as Gifford-McMahon cryocoolers, face limitations in refrigerating performance due to inefficiencies in heat exchange and pressure loss within the expansion space.
Innovation Solution
The design incorporates a displacer with annular protruding and recessed portions on the bottom surface of the expansion space, creating a multiplex structure that increases the heat exchange area and reduces pressure loss by optimizing the clearance between these features, allowing for improved heat transfer and gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional smooth bottom surface is used in the expansion space, then the device structure is simple, but the heat exchange area is insufficient and pressure loss is high
Solution Approach 1:
The bottom surface of the expansion space is segmented into multiple annular protruding portions with different diameters, dividing the previously smooth surface into distinct functional zones. This segmentation increases the effective heat exchange area while maintaining a relatively simple overall structure that can be manufactured using conventional techniques.
Solution Approach 2:
The invention transitions from a two-dimensional smooth bottom surface to a three-dimensional structured surface with annular protrusions of varying diameters. This dimensional change creates additional heat exchange surfaces and optimizes gas flow paths, thereby improving heat exchange efficiency and reducing pressure loss without proportionally increasing structural complexity.
2Loss of energy
If the clearance between protruding portions is increased, then pressure loss is reduced, but heat exchange area is decreased
Solution Approach 1:
The invention optimizes the clearance parameter between annular protruding portions to achieve a balance between pressure loss reduction and heat exchange area maintenance. By carefully controlling the dimensional parameters of the protrusions and their spacing, the design minimizes pressure loss while preserving sufficient heat exchange surface area for effective thermal transfer.
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 heat exchange efficiency between the working gas and the cooling stage, leading to improved refrigerating performance and reduced pressure losses, thereby increasing the overall efficiency of the cryocooler.
Implementation Method 1
using a high-pressure working gas supplied from a compression device, set up Simon expansion to give rise to cryogenic coldness
Implementation Method 2
a plurality of annular protruding portions provided on a bottom surface of the expansion space such as to form a multiplex structure
Data Source
AI summary
In a cryocooler, a displacer includes an internal space, and a working gas flows through the internal space. A cylinder reciprocally accommodates the displacer, and an expansion space for the working gas is formed between the cylinder and a bottom portion of the displacer. A plurality of annular protruding portions are provided on a bottom surface of the expansion space such as to form a multiplex structure. A plurality of annular recessed portions are provided on the bottom portion of the displacer such as to receive the plurality of annular protruding portions.