Patent US3902827A successfully refreshed from Google Patents.
US3902827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw compressor
Assignee: Svenska Rotor Maskiner AB
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Filing: 1974-07-10
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Granted: 1975-09-02
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Expires: 1994-07-10
Abstract
Abstract A screw rotor compressor in which the high pressure ends of the rotors are provided with annular sealing edges cooperating with the high pressure end wall of the working space to provide central sealed chambers around the rotor shafts, which chambers are in communication with the low pressure side of the compressor.
Inventors
- 👤 Lauritz Benedictus Schibbye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:40
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
Screw compressor, of the type comprising two intermeshing rotors having helical lands and grooves disposed within a working space having low pressure and high pressure ports disposed generally diagonally thereof and adjacent to a low pressure and a high pressure end wall of the working space, respectively, characterized by a sealing ring surrounding the shaft of each rotor and disposed between the end plane of the rotor and the high pressure end wall of the working space, and by a drainage channel in said high pressure end wall forming a communication between the volume surrounded by said sealing ring and an area of the working space located within the low pressure phase of the compressor.
Claim 2
Dependent Claim
115 words
Screw compressor, of the type comprising two intermeshing rotors having helical lands and grooves disposed within a working space having low pressure and high pressure ports disposed generally diagonally thereof and adjacent to a low pressure and a high pressure end wall of the working space, respectively, characterized by a sealing ring surrounding the shaft of each rotor and disposed between the end plane of the rotor and the high pressure end wall of the working space, and by a drainage channel in said high pressure end wall forming a communication between the volume surrounded by said sealing ring and an area of the working space located within the low pressure phase of the compressor.
Claim 3
Dependent Claim
52 words
Screw compressor as defined in claim 1 comprising a bearing chamber along the rotor shaft housing a rotor shaft bearing and having bearing lubricating oil supplied thereto, and wherein said volume surrounded by the sealing ring communicates with said bearing chamber whereby said bearing lubricating oil is drained through said drainage channel.
Claim 4
Dependent Claim
29 words
Screw compressor as defined in claim 1, in which said drainage channel comprises a relieved portion in the surface of said high pressure end wall of the working space.
Claim 5
Dependent Claim
30 words
Screw compressor as defined in claim 1, in which said sealing ring is shaped as a thin annular edge fixed to and projecting from the end plane of the rotor.
Claim 6
Dependent Claim
52 words
Screw compressor as defined in claim 4 comprising a bearing chamber along the rotor shaft housing a rotor shaft bearing and having bearing lubricating oil supplied thereto, and wherein said volume surrounded by the sealing ring communicates with said bearing chamber whereby said bearing lubricating oil is drained through said drainage channel.
Claim 7
Dependent Claim
20 words
Screw compressor as defined in claim 4, wherein said sealing ring axially projects from the end plane of the rotor.
Claim 8
Dependent Claim
23 words
Screw compressor as defined in claim 4, wherein said thin annular projecting edge is located just inside the bottoms of the rotor grooves.
Claim 9
Dependent Claim
29 words
Screw compressor as defined in claim 4, in which said drainage channel comprises a relieved portion in the surface of said high pressure end wall of the working space.
Claim 10
Dependent Claim
52 words
Screw compressor as defined in claim 8, comprising a bearing chamber along the rotor shaft housing a rotor shaft bearing and having bearing lubricating oil supplied thereto, and wherein said volume surrounded by the sealing ring communicates with said bearing chamber whereby said bearing lubricating oil is drained through said drainage channel.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |