Displacer assembly and cryocooler
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Solution Overview
Problem
Multi-stage cryocoolers have a lengthened overall shape due to elongated displacers, which increases the total length, and attempts to shorten them by reducing regenerator material or using fewer connection pins limit angular adjustment and affect performance.
Innovation Solution
A cross-shaped connector system that connects two displacers, allowing for inclination in multiple directions while maintaining the regenerator material quantity, reducing the cryocooler's length without performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the displacer is elongated to provide adequate regenerator material, then cooling performance is maintained, but the overall length of the cryocooler increases
Solution Approach 1:
The displacer is designed with a multi-stage structure where the second displacer can be inclined relative to the first displacer in multiple directions (forward, rearward, rightward, leftward). This angular adjustment capability introduces a dimensional degree of freedom that allows the regenerator material to be distributed more effectively in three-dimensional space, maintaining cooling performance while reducing the axial length of the cryocooler.
Solution Approach 2:
The cross-shaped connector with its horizontal hole and intersecting connector pins creates a dynamic connection that allows the second displacer to be inclined at various angles relative to the first displacer. This dynamic adjustability enables optimization of the regenerator material arrangement to achieve both performance and compactness.
2Length of moving object
If the number of connection pins is reduced to shorten the cryocooler, then the overall length decreases, but angular adjustment capability is limited
Solution Approach 1:
The cross-shaped connector acts as an intermediary component between the first and second displacers. Its horizontal hole and intersecting connector pins create a mediation mechanism that enables multi-directional angular adjustment. This intermediary structure provides the necessary degrees of freedom for inclination while maintaining a compact overall length, resolving the contradiction between length reduction and adjustment capability.
3Length of moving object
If regenerator material is reduced to shorten the displacer, then the overall length decreases, but cooling performance deteriorates
Solution Approach 1:
By introducing angular adjustment capability through the cross-shaped connector, the regenerator material can be arranged in a multi-dimensional configuration rather than being constrained to a linear arrangement. This allows adequate regenerator material to be packed into a shorter displacer length by utilizing the angular degree of freedom, thereby maintaining cooling performance while reducing overall length.
Data Source
AI summary
A displacer assembly includes a first displacer including a first displacer lower lid portion and extending along a displacer center axis, a second displacer including a second displacer upper lid portion and disposed so that the second displacer upper lid portion is adjacent to the first displacer lower lid portion along the displacer center axis, and a cross-shaped connector including a first connector pin and a second connector pin, and connecting the second displacer upper lid portion to the first displacer lower lid portion so that the second displacer is inclinable forward, rearward, rightward, and leftward with respect to the first displacer.