Split pulse tube connecting line
AssigneeSumitomo (SHI) Cryogenics of America, Inc.
InventorsMingyao Xu, Tian Lei, Ralph C. Longsworth
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Abstract
Losses in the connecting line between the Pressure Wave Generator and the cold head of a GM type pulse tube refrigerator, are reduced while maintaining or improving upon the desirable features of a standard corrugated hose connecting line including vibration isolation, separation distance, and mounting convenience. The basic means are to reduce the internal void volume of the convolutions in a corrugated hose in combination with reducing the number of corrugations, adding fillers to the void volumes, and vibration absorbing coatings.
Claims8
A pulse tube cryogenic refrigerator comprising:
- a connecting line between a Pressure Wave Generator (PWG) and a pulse tube cold head, wherein the connecting line comprises a metal hose having corrugations that allow the hose to bend at least ninety degrees (90°), an outside diameter (OD) of the corrugations being at least 40% more than an inside diameter (ID) of the corrugations, and wherein an inner volume of the hose is no greater than 33% of a core volume of the hose.
A pulse tube cryogenic refrigerator comprising:
- a connecting line between a Pressure Wave Generator (PWG) and a pulse tube cold head, wherein the connecting line comprises a bendable metal tube and a coupling that has an elastomer seal which prevents metallic contact between the PWG and the pulse tube cold head.
Dependencies are inferred from the claim text.