Characteristics of a 1.6 W Gifford-McMahon Cryocooler with a Double Pipe Regenerator

Cryogenic Engineering Conference 2017

材料科学;物理学

Masuyama, S.^1 ; Numazawa, T.^2

Department of Electronic-Mechanical Engineering, National Institute of Technology, Oshima College, Yamaguchi

742-2193, Japan^1

National Institute of Materials Science, Tsukuba

302-0003, Japan^2

关键词: Cooling power;    Double pipes;    G-m cryocooler;    Helium density;    Input power;    Non-uniform flows;    Regenerator materials;    Stage cooling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012041/pdf
DOI  :  10.1088/1757-899X/278/1/012041

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper focuses on the second stage regenerator of a 4 K Gifford-McMahon (G-M) cryocooler. A three-layer layout of lead (Pb), HoCu2and Gd2O2S spheres in the second stage regenerator derives a good performance at 4 K. After some modifications, we confirmed that the cooling power of 1.60 W at 4.2 K was achieved by using this three-layer layout. A two-stage G-M cryocooler is RDK-408D2 (SHI) and a compressor is C300G (SUZUKISHOKAN) with a rated electric input power of 7.3 kW at 60 Hz. In order to further improve, a double pipe regenerator was applied to the second stage regenerator. As a double pipe, a stainless steel pipe with thin wall was inserted in the coaxial direction into the second stage regenerator. The helium flow in the second stage regenerator is expected to be non-uniform flow because of the distribution of helium density and the imperfect packing of regenerator material. The double pipe regenerator is considered to have an effect of restraining the non-uniform flow. From the experimental results, the second stage cooling power of 1.67 W at 4.2 K and the first stage cooling power of 64.9 W at 50 K were achieved.