低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
低温ヘリウムブロワ
原田 進西田 秀夫松本 孝三岡本 和夫加藤 崇河野 勝己吉田 純
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1991 年 26 巻 6 号 p. 508-511

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A helium blower that can pre-cool superconducting magnets with helium gas at a temperature of 80K was developed. The blower incorporates self-acting gas journal bearings, Rayleigh step-type thrust bearings, a variable-speed induction-motor drive, and a backward impeller. The performance of the blower was measured in a vacuum chamber containing a tank of liquid nitrogen and two heat exchangers. Tests results show that pressure ratio is more than 1.2 and adiabatic efficiency is 61% at design point (mass flow rate of 0.005kg/s and rotational speed of 130, 000rpm). Moreover, for testing bearing reliability, the blower shaft could be successfully driven at up to 148, 300rpm and a start-stop test was done more than one hundred times, but there were no troubles with the shaft or bearings.

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