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

Claim 0:
1. 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-combustible 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 regeneration 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 sensor includes a temperature sensor that generates a temperature measurement signal indicating a temperature of the non-combustible absorbent, and
the controller is configured to control at least one of the heater, the purge valve, and the rough valve to execute the dehydration sequence in a case where the non-combustible absorbent is at the room temperature, based on the temperature measurement signal.