Helix Technology Corporation

Dale A Dopson

Allen J Bartlett

Lawrence A Klusmier

Anthony M Guerra

Paul Meroski

Thomas F Stevens

Charles A Stochl

In a cryopump a frost concentrating device is affixed to a condensing cryopanel and provides surfaces for condensing gases which are cryopumped through an opening in the vacuum vessel. The surfaces of the frost concentrator extend towards the opening in the vacuum vessel and thus limit the amount of gases which condense on the surfaces of the condensing cryopanel facing the opening. The result is that the gap between the radiation shield and the condensing cryopanel does not become significantly narrowed by condensing gases, particularly in the area closest to the opening through which gases are cryopumped. This allows other gases to pass easily through the gap and condense on surfaces of the condensing cryopanel further away from the opening of the cryopump or to be adsorbed by an adsorbent material shielded by the condensing cryopanel.

Cryopump and cryopanel having frost concentrating device

A heat exchanger has a set of tubes through which fluid pass. In thermal communication with these tubes are fins of high thermal conductivity material which disperse the heat contained within the fluid. Also useful in dispersing the heat contained within the passing fluid are rods inserted within the tubes to substantially decrease the hydraulic diameter of the tubes. This heat exchanger may be used in a cryogenic refrigeration system which also includes a compressor for compressing refrigerant gas, a separator for separating refrigerant gas and oil used by the compressor, and a cryogenic refrigerator for expanding the refrigerant gas.

Compact heat exchanger for a cryogenic refrigerator

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Dorchester, MA, United States of America

Dale A Dopson