Patent EP0020111A2 successfully refreshed from Google Patents.
EP0020111A2
Expired / Lapsed
EP
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Arrangement comprising a cryogenic refrigerator and an insulated enclosure, and an assembly including such an arrangement
Assignee: Air Products and Chemicals Inc
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Filing: 1980-05-23
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Granted: —
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Expires: 2000-05-23
Abstract
Abstract A cryogenic refrigerator of the type having a fixed orifice (24) and a variable orifice (18, 20) is characterized in that when it is operated in an insulated enclosure the temperature falls even after the variable orifice has closed. When correctly designed such a cryogenic refrigerator will reach its desired operating temperature range quickly and will remain in the lower part of this range with the variable orifice closed until the pressure of the compressed gas supply to the cryogenic refrigerator falls to about one half its initial value whereupon the variable orifice will open to provide additional refrigeration.
Inventors
- 👤 Ralph Cady Longsworth
- 👤 Matthew George Chalmers
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 06:12
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0243; F25J1/0257; F25J1/0275; F25J1/0276; F25B; F25B9/00; F25B9/02; F25B2309/00; F25B2309/02; F25B2309/022; F25J2290/00; F25J2290/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
A cryogenic refrigerator having a variable orifice and a fixed orifice characterized in that when said cryogenic refrigerator is operated in an insulated enclosure the temperature in said enclosure will fall after said variable orifice has closed.
Claim 2
Dependent Claim
37 words
A cryogenic refrigerator having a variable orifice and a fixed orifice characterized in that when said cryogenic refrigerator is operated in an insulated enclosure the temperature in said enclosure will fall after said variable orifice has closed.
Claim 3
Dependent Claim
49 words
A cryogenic refrigerator according to Claim 1, characterized in that said variable orifice and said fixed orifice are defined by an arrangement comprising a single orifice, a needle valve movable towards and away from said single orifice, and a member for preventing said needle valve closing said single orifice.
Claim 4
Dependent Claim
51 words
A cryogenic refrigerator according to Claim 1, characterized in that said variable orifice and said fixed orifice are defined by an arrangement comprising a single orifice provided with at least one notch, and a needle valve movable towards and away from said single orifice to open and close said single orifice.
Claim 5
Dependent Claim
74 words
A cryogenic refrigerator according to Claim 1, having a warm end and a cold end characterized in that said fixed orifice is connected to said warm end by a first conduit which extends from said warm end to said cold end, and said variable orifice is connected to said warm end by a second conduit which extends from sau-d warm end to said cold end and is separate and distinct from said first conduit.
Claim 6
Dependent Claim
61 words
An arrangement comprising a cryogenic refrigerator as claimed in any preceding Claim, a temperature sensor for monitoring the temperature at or adjacent the cold end of said cryogenic refrigerator and a valve connected to said temperature sensor and operable, in use, to permit or prohibit compressed gas to enter said cryogenic refrigerator in accordance with signals received from said temperature sensor.
Claim 7
Dependent Claim
60 words
A system comprising a cryogenic refrigerator as claimed in any of Claims 1 to 4, or an arrangement as claimed in Claim 5, and including a cylinder containing compresses gas at a pressure X, characterized in that after initial cool down said variable orifice will not reopen at 20°C until the pressure in said cylinder falls to or below 0.5X.
References Cited (Backward Citations)
No citation records indexed.
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