US 12,007,152 B2
Starting method for cryocooler and cryocooler
Shuji Oyama, Nishitokyo (JP)
Assigned to SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Jul. 9, 2021, as Appl. No. 17/371,137.
Application 17/371,137 is a continuation of application No. PCT/JP2020/000516, filed on Jan. 9, 2020.
Claims priority of application No. 2019-004076 (JP), filed on Jan. 15, 2019.
Prior Publication US 2021/0341199 A1, Nov. 4, 2021
Int. Cl. F25B 49/02 (2006.01)
CPC F25B 49/022 (2013.01) [F25B 2500/26 (2013.01); F25B 2600/024 (2013.01); F25B 2700/193 (2013.01); F25B 2700/2104 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A starting method for a cryocooler, the cryocooler including a compressor, a cold head, a high pressure line through which a refrigerant gas is supplied from the compressor to the cold head, and a low pressure line through which the refrigerant gas is collected from the cold head to the compressor, the method comprising:
increasing a volume of the high pressure line when the cold head is at a room temperature;
cooling the cold head from the room temperature to a cryogenic temperature while controlling an operation frequency of the compressor based on a pressure of the high pressure line or a differential pressure between the high pressure line and the low pressure line, after the volume of the high pressure line has been increased;
decreasing the volume of the high pressure line after the cold head has been cooled to the cryogenic temperature; and
maintaining the cold head at the cryogenic temperature after the volume of the high pressure line has been decreased.