Patent ID: 9737828
Date: 2017-08-22
CPC Classifications: B01D,F04B

Claim:
1. A cryopump to be mounted on a gate valve including a movable valve element and a valve housing for movably accommodating the movable valve element, the cryopump comprising: a cryopump housing comprising a tubular portion extending in an axial direction toward an inlet of the cryopump; a cryopump inlet flange configured to attach the cryopump housing to the valve housing, the cryopump inlet flange comprising an inner periphery portion and an outer periphery portion, the inner periphery portion being provided on an outer side, in a radial direction, of an opening end of the tubular portion, the outer periphery portion being configured to attach the cryopump to the valve housing and comprising an inner circumferential surface being exposed to the inlet of the cryopump, wherein a flange recess is defined by an upper surface of the inner periphery portion and the exposed inner circumferential surface of the outer periphery portion; and an inlet cryopanel positioned at the inlet and comprising an extended portion extending into the flange recess in the radial direction, an outer circumference of the extended portion being positioned inward of the inner circumferential surface of the outer periphery portion in the radial position and positioned above the upper surface of the inner periphery portion in the axial direction, wherein the outer circumference of the extended portion directly faces the exposed inner circumferential surface of the outer periphery portion.