US4068984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-stage screw-compressor with different tooth profiles
Assignee: H AND H LICENSING CORP
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Filing: 1974-12-03
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Granted: 1978-01-17
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Expires: 1994-12-03
Abstract
Abstract A screw compressor has at least two pairs of compressor rotors arranged in series, the outside diameter of the rotors of the two pairs being substantially the same, and the ratio of the outside diameter to the diameter at the base of the rotor teeth or vanes of the second pair being such that the capacity of the rotors corresponds to the intake volume of fluid to be compressed flowing from the first to the second pair of rotors.
Inventors
- 👤 Walter G. Spindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:32
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
264 words
A screw compressor system for compressing gaseous media adapted to compress small suction intake volumes of media and provided with a series of pairs of meshing rotors comprising two compression stages characterized in that the rotors of each series have an outside diameter which is large with respect to the suction intake volume of gas, one of said rotors of each series being a male rotor having teeth disposed in grooves of a female rotor, the axes of rotation of the second pair of rotors being spaced farther apart from each other than the axes of rotation of the first pair of rotors, and the ratio of the diameter of the rotors at the peripheral edge of the rotor teeth to the diameter of the rotor at the base of the teeth for the pairs of rotors being so related to provide grooves which compensate for the difference in volume between the intake of fluid to the first pair and the intake to the succeeding pair of rotors and wherein the rotors of the two compressor stages have essentially the same outside diameter, the ratio of the outside diameter to the dedendum diameter of the rotors in the second stage is smaller than the ratio of the outside diameter to the dedendum diameter of the rotors in the first stage and characterized in that the tooth contours of the rotors in the second stage are so designed that the ratio of tooth width of the female rotor at its narrowest point to the tooth groove width at its widest point is at least 1.0.
Claim 2
Dependent Claim
264 words
A screw compressor system for compressing gaseous media adapted to compress small suction intake volumes of media and provided with a series of pairs of meshing rotors comprising two compression stages characterized in that the rotors of each series have an outside diameter which is large with respect to the suction intake volume of gas, one of said rotors of each series being a male rotor having teeth disposed in grooves of a female rotor, the axes of rotation of the second pair of rotors being spaced farther apart from each other than the axes of rotation of the first pair of rotors, and the ratio of the diameter of the rotors at the peripheral edge of the rotor teeth to the diameter of the rotor at the base of the teeth for the pairs of rotors being so related to provide grooves which compensate for the difference in volume between the intake of fluid to the first pair and the intake to the succeeding pair of rotors and wherein the rotors of the two compressor stages have essentially the same outside diameter, the ratio of the outside diameter to the dedendum diameter of the rotors in the second stage is smaller than the ratio of the outside diameter to the dedendum diameter of the rotors in the first stage and characterized in that the tooth contours of the rotors in the second stage are so designed that the ratio of tooth width of the female rotor at its narrowest point to the tooth groove width at its widest point is at least 1.0.
Claim 3
Dependent Claim
22 words
The screw compression system of claim 1 wherein the male rotors of all of the stages are driven at the same rpm.
Claim 4
Dependent Claim
47 words
The screw compressor system of claim 1 wherein the rotors of the various compression stages are provided with drive shafts which are mounted parallel to one another and which are driven by a spur gearing by means of equally-sized drive gears associated with the individual compression stages.
Claim 5
Dependent Claim
23 words
The screw compressor system as defined by claim 1 wherein the rotors of all the compression stages are provided with a common drive.
Claim 6
Dependent Claim
233 words
A screw type fluid compressor having a series comprising two pairs of rotors disposed in a housing and comprising helical threads with grooves of decreasing volume from intake to output ends of the rotors, one of said rotors being a driving male rotor having teeth disposed in grooves of a female rotor, means for flow of fluid from the first pair of rotors to the second pair of the series, the outside diameter of the rotors of the two pairs being substantially equal to each other, the axes of rotation of the second pair of rotors being spaced farther apart from each other than the axes of rotation of the first pair of rotors, the ratio of outside diameter to the diameter of the rotors at the base of the teeth of the second pair being smaller than that of the rotors of the first pair to provide grooves which compensate for the difference in volume between the intake of fluid to the first pair and the intake to the succeeding pair of rotors, and means for driving the male rotors of the two pairs at the same speed and characterized in that the tooth contours of the rotors in the second stage are so designed that the ratio of tooth width of the female rotor at its narrowest point to the tooth groove width at its widest point is at least 1.0.
Claim 7
Dependent Claim
233 words
A screw type fluid compressor having a series comprising two pairs of rotors disposed in a housing and comprising helical threads with grooves of decreasing volume from intake to output ends of the rotors, one of said rotors being a driving male rotor having teeth disposed in grooves of a female rotor, means for flow of fluid from the first pair of rotors to the second pair of the series, the outside diameter of the rotors of the two pairs being substantially equal to each other, the axes of rotation of the second pair of rotors being spaced farther apart from each other than the axes of rotation of the first pair of rotors, the ratio of outside diameter to the diameter of the rotors at the base of the teeth of the second pair being smaller than that of the rotors of the first pair to provide grooves which compensate for the difference in volume between the intake of fluid to the first pair and the intake to the succeeding pair of rotors, and means for driving the male rotors of the two pairs at the same speed and characterized in that the tooth contours of the rotors in the second stage are so designed that the ratio of tooth width of the female rotor at its narrowest point to the tooth groove width at its widest point is at least 1.0.
Claim 8
Dependent Claim
28 words
The screw compressor of claim 5 wherein the teeth of the threads of the male rotor in the second pair substantially fill the grooves in the female rotor.
Claim 9
Dependent Claim
18 words
The screw compressor of claim 6 wherein the teeth of the said male rotor are semi-elliptical in cross-section.
References Cited (Backward Citations)
US2975963A
Cited
US3209990A
Cited
US3279682A
Cited
US3265292A
Cited
US3622256A
Cited
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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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |