| 摘要 |
PURPOSE:To produce a small and light cooling unit having excellent noise- proof performance with low cost and short assembling time by burrying the cooling tube in the outercircumference of casing. CONSTITUTION:It is most suitable for a cryogenic refrigerator using coolant gas such as helium gas. Double tubes are arranged in spiral on the outercircumference of casing 8 to constitute a cooling unit 4 which is jointed to the outercircumference of casing 8 burried with heat-conductive cement 9. Compressed refrigerant gas 6 will flow through the inner tube of double tube or a cooling unit 4 while cooling water will flow through the outer tube. Then heat-resistant, thermal insulation and noise-proof sheath is provided on the outercircumference to provide protection of heat-conductive cement and muffler effect.
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