US3632235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic pump system
Assignee: Individual
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Filing: 1969-06-09
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Granted: 1972-01-04
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Expires: 1989-06-09
Abstract
Abstract A cryogenic pump system having low heat leak and low net positive suction head. The supply and vent lines between a pump and a cryogenic liquid storage Dewar are contained in a vacuum jacket manifold which provides vacuum insulation over the entire length of the lines. The manifold has bellows sections for flexibility and is adapted for bayonet connection to the storage Dewar outlets. The pumping element or ''''cold end'''' of the pump is insulated by a horizontal Dewar which also encloses a relatively small sump flooding only the suction port of the pump. The sump is filled with cryogenic liquid via the supply line, appropriate liquid level being maintained by a vent dip tube connected to the storage Dewar vent line. A Venturi built into the vent dip tube and powered by the piston ring blowby aspirates excess liquid from the sump.
Inventors
- 👤 Carl A Grenci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:26
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/164; F04B15/00; F04B15/06; F04B15/08; F17; F17C; F17C5/00; F17C5/06; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2203/00; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2227/00; F17C2227/01; F17C2227/0128; F17C2227/0135; F17C2270/00; F17C2270/05; F17C2270/0509; Y; Y10; Y10S; Y10S417/00; Y10S417/901
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A vacuum insulated supply system for a cryogenic pump, said pump having a pumping element including a suction port and a discharge port, said system comprising: a Dewar enclosure surrounding said pumping element, a sump within said enclosure and spaced from said discharge port, said suction port projecting into said sump, and means for supplying cryogenic liquid into said sump, and wherein said Dewar enclosure comprises: a back flange rigidly attached to said pump, said pumping element projecting through said back flange, said back flange forming a wall of said enclosure, and a generally cylindrical Dewar having a closed end and an open end, said Dewar covering said pumping element and said sump, the open end of said Dewar being sealingly attached to said back flange to complete said enclosure.
Claim 2
Dependent Claim
130 words
A vacuum insulated supply system for a cryogenic pump, said pump having a pumping element including a suction port and a discharge port, said system comprising: a Dewar enclosure surrounding said pumping element, a sump within said enclosure and spaced from said discharge port, said suction port projecting into said sump, and means for supplying cryogenic liquid into said sump, and wherein said Dewar enclosure comprises: a back flange rigidly attached to said pump, said pumping element projecting through said back flange, said back flange forming a wall of said enclosure, and a generally cylindrical Dewar having a closed end and an open end, said Dewar covering said pumping element and said sump, the open end of said Dewar being sealingly attached to said back flange to complete said enclosure.
Claim 3
Dependent Claim
109 words
A vacuum insulated supply system for a cryogenic pump, said pump having a pumping element including a suction port and a discharge port, said system comprising: a Dewar enclosure surrounding said pumping element, a sump within said enclosure and spaced from said discharge port, said suction port projecting into said sump, and means for supplying cryogenic liquid into said sump, comprising; a vent tube passing through a wall of said enclosure, a vent dip tube extending into said sump and communicating with said vent tube, and a supply tube entering through a wall of said enclosure and extending into said sump below the level of said vent dip tube.
Claim 4
Dependent Claim
109 words
A vacuum insulated supply system for a cryogenic pump, said pump having a pumping element including a suction port and a discharge port, said system comprising: a Dewar enclosure surrounding said pumping element, a sump within said enclosure and spaced from said discharge port, said suction port projecting into said sump, and means for supplying cryogenic liquid into said sump, comprising; a vent tube passing through a wall of said enclosure, a vent dip tube extending into said sump and communicating with said vent tube, and a supply tube entering through a wall of said enclosure and extending into said sump below the level of said vent dip tube.
Claim 5
Dependent Claim
41 words
A system according to claim 2 adapted for use with a conventional cryogenic liquid storage Dewar, said supply tube communicating with the liquid supply outlet of said storage Dewar, said vent tube communicating with the vent outlet of said storage Dewar.
Claim 6
Dependent Claim
38 words
A system according to claim 2 wherein said supply tube extends into said sump to a level below said suction port and wherein said vent dip tube extends into said sump to a level above said suctIon port.
Claim 7
Dependent Claim
34 words
A system according to claim 4 further comprising a Venturi tube within said vent tube adjacent said vent dip tube, and means for providing the ring blowby from said pump to said Venturi tube.
Claim 8
Dependent Claim
34 words
A system according to claim 5 wherein said pumping element includes a ring blowby port, and wherein said means for providing comprises a blowby tube connecting said ring blowby port and said Venturi tube.
Claim 9
Dependent Claim
161 words
In a cryogenic pump system including a storage Dewar containing a liquid at cryogenic temperatures, and a pump having a pumping element including a suction port and a discharge line, the improvement comprising: interconnecting apparatus including vacuum insulated supply and vent lines leading from said storage Dewar, a Dewar enclosure surrounding said pumping element, a sump within said enclosure and spaced from said discharge line, said suction port projecting into said sump, first and second vacuum jacket manifold extensions projecting through a wall of said enclosure, said supply and vent lines extending respectively through said first and second extensions, a vent tube within said enclosure and communicating with said vent line, a vent dip tube extending into said sump to a level above said suction port, said dip tube communicating with said vent tube, and a supply tube within said enclosure and communicating with said supply line, said supply tube extending into said sump to a level below said suction port.
Claim 10
Dependent Claim
161 words
In a cryogenic pump system including a storage Dewar containing a liquid at cryogenic temperatures, and a pump having a pumping element including a suction port and a discharge line, the improvement comprising: interconnecting apparatus including vacuum insulated supply and vent lines leading from said storage Dewar, a Dewar enclosure surrounding said pumping element, a sump within said enclosure and spaced from said discharge line, said suction port projecting into said sump, first and second vacuum jacket manifold extensions projecting through a wall of said enclosure, said supply and vent lines extending respectively through said first and second extensions, a vent tube within said enclosure and communicating with said vent line, a vent dip tube extending into said sump to a level above said suction port, said dip tube communicating with said vent tube, and a supply tube within said enclosure and communicating with said supply line, said supply tube extending into said sump to a level below said suction port.
Claim 11
Dependent Claim
131 words
A vacuum insulated supply system for a cryogenic pump, said pump having a pumping element including a suction port and a discharge port and having a discharge tube extending from said discharge port, said system comprising: a Dewar enclosure forming a first reservoir space, said pumping element and a portion of said discharge tube being situated within said first reservoir space, a sump within said first reservoir space and forming a second reservoir, said suction port projecting into said second reservoir, and means for supplying cryogenic liquid into said sump, said cryogenic liquid being confined to within said second reservoir to provide flooded suction to said suction port, said discharge port and said discharge tube portion being spaced from said sump and therefore out of contact with said supplied cryogenic liquid.
Claim 12
Dependent Claim
131 words
A vacuum insulated supply system for a cryogenic pump, said pump having a pumping element including a suction port and a discharge port and having a discharge tube extending from said discharge port, said system comprising: a Dewar enclosure forming a first reservoir space, said pumping element and a portion of said discharge tube being situated within said first reservoir space, a sump within said first reservoir space and forming a second reservoir, said suction port projecting into said second reservoir, and means for supplying cryogenic liquid into said sump, said cryogenic liquid being confined to within said second reservoir to provide flooded suction to said suction port, said discharge port and said discharge tube portion being spaced from said sump and therefore out of contact with said supplied cryogenic liquid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |