OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 12
1-2 SRDK SERIES CRYOCOOLER
1-2 SRDK SERIES CRYOCOOLER
The SRDK Series Cryocooler consists of a Cold Head, Compressor Unit, Flex Lines, and Cold Head
Power Cable.
The RDK series Cold Head is a GM cycle cryo-refrigerator. The function of the Cold Head is to produce
continuous closed-cycle refrigeration at temperatures, depending upon the heat load imposed.
The Cold Head has three (3) major components: the drive unit; the cylinder; and the displacer-regenerator
assembly, which is located inside the cylinder.
RDK-408D2 & RDK-408D & RDK-415D 4K Cold Heads are applied rare earth material for the second
stage displacer to produce 4K temperature. The second stage cooling capacity is approximately 1.0W at
4.2K for RDK-408D2 & RDK-408D, and 1.5W at 4.2K for RDK-415D.
RDK-408S2 & RDK-408S 10K Cold Head is the standard type Cold Head which are modified to produce
more cooling capacity for the second stage cold station compared with SHI previous standard type Cold
Head.
The second stage cooling capacity of RDK-408S2 & RDK-408S Cold Head is approximately 5W at 10K.
RDK-400B Single Stage Cold Head has only first stage displacer for cooling the shield.
The cooling capacity of RDK-400B is approximately 54W at 40K.
The Compressor Unit is required to operate the Cold Head. The Compressor Unit will provide the power
and the high-pressure helium gas for the Cold Head, and consisted of a compressor capsule, a cooling
system and lubricating oil mist Adsorber.
Functionally, the high-pressure helium gas from the Compressor Unit will be supplied to the Cold Head
through the helium gas supply connector. The supply gas will be passed into the displacer-regenerator
assembly, come out through the displacer-regenerator assembly to the crankcase through the motor
housing, and finally will be returned to the Compressor Unit through the helium gas return connector. The
helium gas expansion in the displacer-regenerator assembly will provide cooling condition for the first and
second-stage cold stations.
The Cryocooler requires the routine maintenance to keep the performance. The Adsorber replacement of
the Compressor Unit is required every 20,000 operating hours. The acting parts replacement of the Cold
Head is required to maintain every 10,000 operating hours.
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