ULTRA-LOW-TEMPERATURE FREEZER AND MONITORING METHOD FOR ULTRA-LOW-TEMPERATURE FREEZER

WIPO Patent Application WO/2022/064989

A1

An ultra-low-temperature freezer 10 can execute a normal operation and a cool-down operation prior to the normal operation. The ultra-low-temperature freezer 10 comprises: an expansion machine motor 42 that causes an expansion machine 14 of the ultra-low-temperature freezer 10 to operate; an inverter 90 that is configured so as to control the operating frequency of the expansion machine motor 42, and that can operate so as to drive the expansion machine motor 42 at an operating frequency lower than the operating frequency for the cool-down operation during the normal operation; a current sensor 50 that measures the current supplied from the inverter 90 to the expansion machine motor 42, and that outputs a motor current signal indicating the current; and a processing unit 100 that monitors the expansion machine motor 42 on the basis of the motor current signal at least during the normal operation.

JP7233955	Cryogenic Refrigerator, Cryogenic Refrigerator Diagnosis Device, and Cryogenic Refrigerator Diagnosis Method
JP5839519	Z mechanism valve mechanism
JP2003021411	SUPERCRITICAL VAPOR COMPRESSION REFRIGERATING MACHINE

MORIE TAKAAKI (JP)

PCT/JP2021/032255

March 31, 2022

September 02, 2021

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SUMITOMO HEAVY INDUSTRIES (JP)

F25B9/06; F25B49/00

WO2018073855A1	2018-04-26
WO2021075274A1	2021-04-22

JP2722731B2	1998-03-09
JP2012159270A	2012-08-23
JP2016211780A	2016-12-15
JPH09140151A	1997-05-27
JP2008202905A	2008-09-04
JP2008101860A	2008-05-01
US5651667A	1997-07-29
JP2002238278A	2002-08-23
JPH03152353A	1991-06-28

See also references of EP 4220037A4

MORISHITA Sakaki (JP)

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