Patent ID: 11885321
Assignee: SUMITOMO HEAVY INDUSTRIES, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC F  B | IPC F

Claim 15:
16. A cryopump comprising:
a cryopump housing;
a cryopanel disposed in the cryopump housing and provided with a non-combustible adsorbent;
a heater that heats the non-combustilbe adsorbent and the cryopanel;
a purge valve that is mounted to the cryopump housing and connects the cryopump housing to a purge gas source;
a rough valve that is mounted to the cryopump housing and connects the cryopump housing to a rough pump;
a sensor that generates a measurement signal indicating a temperature of the non-combustible adsorbent or an internal pressure of the cryopump housing; and
a controller that receives a regeneration start command and controls at least one of the heater, the purge valve, and the rough valve based on the measurement signal so as to execute either (i) a sublimation regeration sequence or (ii) a dehydration sequence,
the sublimation regeneration sequence configured to sublimate water from the non-combustible adsorbent by exposing the non-combustible adsorbent to a vacuum atmosphere,
the dehydration sequence configured to dehydrate the non-combustible adsorbent by exposing the non-combustible adsorbent to a dry atmosphere having a higher pressure than the vacuum atmosphere, at room temperature or a temperature higher than the room temperature,
wherein the controller is configured to control at least one of the heater, the purge valve, and the rough valve to execute the sublimation regeneration sequence following the dehydration sequence.