The Experimental Study of a Single Stage G-M Refrigerator With the Regenerator Set Outside the Cylinder. Page: 2 of 6
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Warm stage drive head
He gasCold stage drive head
4He gasCold stage cylinder
Wann stage regenerator /
I I Cold stage displacer
Warm stage heat exchanger
Vacuum chamber
Copper heat bridge
Cold stage regenerator
Cold stage cold head heat exchanger
Figure 1. Schematic diagram of experimental apparatus for a new-type 4K GM cryocooler
heat losses from ambient environment, the cold stage regenerator was nut outside the
cylinder, and the cold head heat exchanger at the cold stage was somewhat different
from the conventional one. The new-type refrigerator shown in Figure I is flexible in
constructing experiments. It also can be used as a test station for the researches of GM
coolers. In this paper, we preliminarily tested the performance of the cold stage GM
refrigerator that can be used for a kind of single-stage cryocooler different from the
conventional co-axial structure. Some results were obtained [71 This paper also
describes the principal design features of the single-stage GM refrigerator.
EXPERIMENTAL APPARATUS
Figure 2 shows the schematic of the single-stage GM cryocooler used as the
experimental machine. The regenerator was placed outside the cylinder. The solid
displacer reciprocated in the cylinder, driven by an AC induction motor. The cycle
speed could be varied by changing the power supply frequency. The stroke of the
displaced was 25mm. The displacer was divided into three parts. The middle part is a
copper block. The rest of the displacer was made of textolite. They were connected by
epoxy adhensive.
The regenerator outside the cylinder and the cylinder were also divided into three parts
in order to precool the cold stage of the 4K GM cryocooler shown in Figure 1. The
cylinder and regenerator are both longer than that of a conventional single-stage
refrigerator to reduce the shuttle and conduction losses. The high temperature and low
temperature parts of the cylinder and the regenerator are both stainless steel pipes. The
middle part of the cylinder is a copper circular.
The phosphor bronze screens were stacked at the high temperature part of the
regenerator. The copper spheres were sintered into a copper tube as its middle part. A
combination of the triple-layer materials composed of lead spheres, Er3Ni and ErNi2
grains was stuffed in sequence from the hot to the cold end in the low temperature part
of the regenerator. The cold head heat exchanger was located at the cold end of the
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Wang, L. The Experimental Study of a Single Stage G-M Refrigerator With the Regenerator Set Outside the Cylinder., article, July 12, 1999; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc623087/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.