US3585807A
Expired / Lapsed
US
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Method of and apparatus for pumping gas under cryogenic conditions
Assignee: Balzers Patent und Beteiligungs AG
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Filing: 1969-08-18
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Granted: 1971-06-22
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Expires: 1989-08-18
Abstract
Abstract In pumping a gas under cryogenic conditions, condensation surfaces disposed within a receiver containing the gas to be pumped are cooled to a predetermined temperature while the surfaces are thermally insulated from any heat within the receiver. During initial cooling the gas is not permitted to flow over the condensation surfaces. When the predetermined temperature is reached, the gas within the receiver, which is under vacuum conditions, is circulated over the condensation surfaces. The amount of gas flowing over the condensation surfaces is regulated in accordance with the temperature, vacuum and other conditions within the receiver.
Inventors
- 👤 Jurgen Hengevoss
- 👤 Hermann Wossner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:12
CPC Classifications
F; F04; F04B; F04B37/00; F04B37/06; F04B37/08; F25; F25B; F25B23/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
A method, as set forth in claim 1, wherein establishing vacuum conditions within the enclosed space for pumping the gas under cryogenic conditions.
Claim 2
Dependent Claim
40 words
A method, as set forth in claim 2, wherein cooling the condensation surfaces to a temperature of about 20* Kelvin and regulating the gas flow over the condensation surfaces for maintaining the vacuum conditions at about 10 4 mm. Hg.
Claim 3
Dependent Claim
91 words
Apparatus for pumping gas under cryogenic conditions comprising walls forming a closed chamber containing the gas to be pumped, means for forming condensation surfaces within the chamber for cooling the gas to the requisite low temperature, means for enclosing said condensation surfaces within said chamber for preventing the gas within said chamber from flowing ovEr the condensation surfaces, means for thermally insulating said enclosing means for preventing heat within said chamber from affecting said condensation surfaces, and means for throttling the flow of gas within said chamber over said condensation surfaces.
Claim 4
Dependent Claim
55 words
Apparatus, as set forth in claim 4, wherein said enclosing means for said condensation surfaces comprising wall means surrounding said condensation surfaces and including a hood member, and said thermal insulating means comprising thermal insulation material covering said wall means including said hood for preventing heat from within said chamber from contacting said condensation surfaces.
Claim 5
Dependent Claim
61 words
Apparatus, as set forth in claim 5, wherein said means for throttling the flow of gas comprising a shaft extending into said chamber and being secured to said hood, and means for engaging said shaft exteriorly of said chamber for displacing said hood member from its position enclosing said condensation surfaces for variably admitting flow of gas to said condensation surfaces.
Claim 6
Dependent Claim
102 words
Apparatus, as set forth in claim 4, wherein said enclosing means comprising a housing enclosing a portion of said condensation surfaces, a cover for cooperation with said housing for completely enclosing said condensation surfaces, a cooling coil mounted on said housing for circulating a cooling medium therethrough for removing heat from said housing and preventing the heat from reaching said condensation surfaces, and said cover comprising a frame, a plurality of metallic plates mounted within said frame and arranged to prevent heat from within said chamber from contacting said condensation surfaces, and a second coil encircling said frame for removing heat therefrom.
Claim 7
Dependent Claim
66 words
Apparatus, as set forth in claim 7, wherein a rotatable shaft extending through said wall means into the interior of said chamber and being secured at its inner end to said cover, and means located exteriorly of said chamber for rotating said shaft and displacing said cover from said housing and thereby admitting gas within said chamber to flow over said condensation surfaces within said housing.
Claim 8
Dependent Claim
49 words
Apparatus, as set forth in claim 4, wherein said enclosing means comprising a pair of spaced plates located on opposite sides of said condensation surfaces, a plurality of rotatable plate sections extending between said plates and being arranged in combination with said plates to completely enclose said condensation surfaces.
Claim 9
Dependent Claim
96 words
Apparatus, as set forth in claim 4, wherein said means for throttling the flow of gas comprising a shaft member centrally located within said plate sections and extending into said chamber from the exterior of said wall means, a drive gear mounted on said shaft, a plurality of individual gears each mounted on one of said plate sections and in meshed engagement with said drive gear, and means for rotating said shaft whereby said drive gear is rotated and in turn individually rotates said plate sections for selectively admitting gas for flow over said condensation surfaces.
Claim 10
Dependent Claim
32 words
Apparatus, as set forth in claim 4, wherein said condensation surfaces comprising a cooling coil located within said chamber, and conduit means connected to said cooling coil for circulating a refrigerant therethrough.
Claim 11
Dependent Claim
19 words
Apparatus, as set forth in claim 4, wherein means being connected to said chamber for establishing a vacuum therein.
Claim 12
Dependent Claim
60 words
Apparatus, as set forth in claim 4, wherein a temperature sensor positioned within said chamber adjacent said condensation surfaces, a control device operatively connected to said temperature sensor, and drive means for opening and closing said throttle means being in communication with said control device which regulates the extent of the opening of said throttle means by said drive means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |