US4490102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volumetric screw compressor
Assignee: SCIETE ANONYME DBA
•
Filing: 1983-07-11
•
Granted: 1984-12-25
•
Expires: 2003-07-11
Abstract
Abstract The compressor, with rotating assemblies of low inertia, and of compact construction, comprises, housed in a housing, two hollow rotors (5, 6), for example out of plastic material, fixed respectively on a front shaft member (20, 21) journalled in a front bulkhead (26) and each supported at the rear by a rear bearing assembly (11) fixed to a rear end wall (2) of the housing and entirely contained within the internal space (7, 7) in the rotor. The drive is provided by the female rotor (6). The inner surfaces of the housing and the outer surfaces of the rotor threads are coated with an overthickened layer of an erodable coating material containing particles of a dry lubricant material.
Inventors
- 👤 Jean-Jacques Carre
- 👤 Pierre Courbot
- 👤 Roland Levrai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:49
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/082; F04C18/084; F01; F01C; F01C21/00; F01C21/10; F04C18/086; F04C18/12; F04C18/14; F04C18/16; F04C2230/00; F04C2230/90; F04C2230/91
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
188 words
A screw compressor, comprising a male rotor and a female rotor respectively arranged within two intercommunicating parallel cylindrical chambers formed in a housing and closed, at their opposite axial ends, by a rear end wall and a front bulkhead, each rotor being supported and rotatingly driven by a shaft means including a first shaft end extending through said front bulkhead, said first shaft ends being provided with meshing toothed wheels for synchronously driving said rotors, each said first shaft end extending within a recess formed in the corresponding rotor and being coupled for rotation therewith within said recess, characterized in that each rotor includes a hub having a longitudinally extending transversing internal space, each said shaft means comprising a rear bearing assembly received within the corresponding end portion of said internal space and sealingly mounted on a rear shaft member fixed to said rear end wall, and a front shaft member forming said first shaft end secured to the corresponding rotor and cooperating with an annular seal received within a tubular portion of said front bulkhead which extends into said front end portion of said internal traversing space.
Claim 2
Dependent Claim
188 words
A screw compressor, comprising a male rotor and a female rotor respectively arranged within two intercommunicating parallel cylindrical chambers formed in a housing and closed, at their opposite axial ends, by a rear end wall and a front bulkhead, each rotor being supported and rotatingly driven by a shaft means including a first shaft end extending through said front bulkhead, said first shaft ends being provided with meshing toothed wheels for synchronously driving said rotors, each said first shaft end extending within a recess formed in the corresponding rotor and being coupled for rotation therewith within said recess, characterized in that each rotor includes a hub having a longitudinally extending transversing internal space, each said shaft means comprising a rear bearing assembly received within the corresponding end portion of said internal space and sealingly mounted on a rear shaft member fixed to said rear end wall, and a front shaft member forming said first shaft end secured to the corresponding rotor and cooperating with an annular seal received within a tubular portion of said front bulkhead which extends into said front end portion of said internal traversing space.
Claim 3
Dependent Claim
32 words
A screw compressor according to claim 1, characterized in that said front shaft member of said female rotor is provided with means for coupling to a driving unit for driving the compressor.
Claim 4
Dependent Claim
42 words
A screw compressor according to claim 2, characterized in that said front shaft member of said male rotor carries two coaxial pitch adjustable toothed wheels in meshing engagement with a toothed wheel carried by said front shaft member of said female rotor.
Claim 5
Dependent Claim
19 words
A screw compressor according to claim 1, characterized in that both rotors are made out of rigid plastic material.
Claim 6
Dependent Claim
21 words
A screw compressor according to claim 1, characterized in that each said rotor is molded into the respective front shaft member.
Claim 7
Dependent Claim
26 words
A screw compressor according to claim 1, characterized in that each said rear shaft member is fixed to said rear end wall by a central screw.
Claim 8
Dependent Claim
36 words
A screw compressor according to claim 1, characterized in that at least said chambers have their inner walls coated with an overthickened layer of erodable coating material containing particles of at least one dry lubricant material.
Claim 9
Dependent Claim
122 words
A screw compressor comprising a male rotor and a female rotor having cooperating threads respectively housed in two parallel intercommunicating chambers formed in a housing having inner walls and closed, at their opposite axial ends, by a rear end wall and a front end wall, respectively, each rotor being supported and driven in rotation by shaft means comprising a first shaft end extending through said front end wall, said first shaft ends being provided with meshing toothed wheels for synchronous driving of said rotors, characterized in that at least said inner walls of said chambers are coated with an overthickened layer of an erodable coating material containing particles of dry lubricant material, said driving toothed wheels being meshingly coupled without angular play.
Claim 10
Dependent Claim
122 words
A screw compressor comprising a male rotor and a female rotor having cooperating threads respectively housed in two parallel intercommunicating chambers formed in a housing having inner walls and closed, at their opposite axial ends, by a rear end wall and a front end wall, respectively, each rotor being supported and driven in rotation by shaft means comprising a first shaft end extending through said front end wall, said first shaft ends being provided with meshing toothed wheels for synchronous driving of said rotors, characterized in that at least said inner walls of said chambers are coated with an overthickened layer of an erodable coating material containing particles of dry lubricant material, said driving toothed wheels being meshingly coupled without angular play.
Claim 11
Dependent Claim
28 words
A screw compressor according to claim 8, characterized in that the outer surfaces of said rotor threads are coated with an overthickened layer of said erodable coating material.
Claim 12
Dependent Claim
45 words
A screw compressor according to claim 8, characterized in that said first shaft end of one of said rotors carries two coaxial pitch adjustable toothed wheels in meshing engagement with a toothed wheel carried by the first shaft end of the other of said rotors.
Claim 13
Dependent Claim
17 words
A screw compressor according to claim 8, characterized in that said erodable coating material contains graphite particles.
Claim 14
Dependent Claim
45 words
A screw compressor according to claim 8, characterized in that said shaft means of each said rotor comprises a first shaft member journalled within said front end wall and having an inner end portion secured into an axially extending recess formed centrally in said rotor.
Claim 15
Dependent Claim
29 words
A screw compressor according to claim 12, characterized in that said front shaft member of said female rotor comprises coupling means for coupling the compressor to a prime mover.
References Cited (Backward Citations)
US1233599A
Cited
US2659239A
Cited
FR1110645A
Cited
US3139834A
Cited
FR1318591A
Cited
US3182900A
Cited
FR1532606A
Cited
FR2027192A1
Cited
FR2091537A5
Cited
FR2097285A5
Cited
US3857682A
Cited
DE2520667A1
Cited
US4039296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |