US3715176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbo machine rotor structure
Assignee: Elliott Turbomachinery Co Inc
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Filing: 1971-09-01
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Granted: 1973-02-06
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Expires: 1991-09-01
Abstract
Abstract The wheel shaft of a multi-stage turbo machine is formed with a succession of adjoining areas which progressively change in diameter to provide a stepped shaft arrangement. The bores in all of the wheels are the same diameter. A bushing is fixed in the bore of each wheel. The bore in each bushing has an end portion dimensioned for an interference fit with a selected area on the shaft. The opposite end portion of the bushing bore is dimensioned for a sliding fit on the shaft area. The end portions of the bushing bore are provided with shaft seals and the medial area of the bore is formed with a recess. The shaft is formed with axially extending passages which communicate with the recesses in the respective bushings for expansion and removal thereof from the shaft.
Inventors
- 👤 P Kerklo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:58
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F04D29/286; F01; F01D; F01D5/00; F01D5/02; F01D5/04; F01D5/043; F04D17/00; F04D17/08; F04D17/10; F04D17/12; F04D17/122; F04D29/266
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
A rotor structure for multi-stage turbo machines including an impeller shaft formed with a succession of adjoining areas progressively changing in diameter, an impeller mounted on each of said shaft areas, all of said impellers having bores of like diameter, a bushing fixedly mounted in the bore of each of said impellers, each of said bushings being formed with a bore having an end portion forming an interference fit with a selected shaft area, the opposite end portion of said bore having a sliding fit with said shaft area, a shaft seal positioned in each end portion of the bushing bore, said shaft being formed with passages extending axially from one end of said shaft, each of said passages serving for the conveyance of hydraulic pressure against the bore of a bushing intermediate said seals therein and the shaft area on which the bushing is mounted for the expansion of the bushing and removal thereof from the shaft area.
Claim 2
Dependent Claim
159 words
A rotor structure for multi-stage turbo machines including an impeller shaft formed with a succession of adjoining areas progressively changing in diameter, an impeller mounted on each of said shaft areas, all of said impellers having bores of like diameter, a bushing fixedly mounted in the bore of each of said impellers, each of said bushings being formed with a bore having an end portion forming an interference fit with a selected shaft area, the opposite end portion of said bore having a sliding fit with said shaft area, a shaft seal positioned in each end portion of the bushing bore, said shaft being formed with passages extending axially from one end of said shaft, each of said passages serving for the conveyance of hydraulic pressure against the bore of a bushing intermediate said seals therein and the shaft area on which the bushing is mounted for the expansion of the bushing and removal thereof from the shaft area.
Claim 3
Dependent Claim
159 words
A rotor structure for multi-stage turbo machines including an impeller shaft formed with a succession of adjoining areas progressively changing in diameter, an impeller mounted on each of said shaft areas, all of said impellers having bores of like diameter, a bushing fixedly mounted in the bore of each of said impellers, each of said bushings being formed with a bore having an end portion forming an interference fit with a selected shaft area, the opposite end portion of said bore having a sliding fit with said shaft area, a shaft seal positioned in each end portion of the bushing bore, said shaft being formed with passages extending axially from one end of said shaft, each of said passages serving for the conveyance of hydraulic pressure against the bore of a bushing intermediate said seals therein and the shaft area on which the bushing is mounted for the expansion of the bushing and removal thereof from the shaft area.
Claim 4
Dependent Claim
159 words
A rotor structure for multi-stage turbo machines including an impeller shaft formed with a succession of adjoining areas progressively changing in diameter, an impeller mounted on each of said shaft areas, all of said impellers having bores of like diameter, a bushing fixedly mounted in the bore of each of said impellers, each of said bushings being formed with a bore having an end portion forming an interference fit with a selected shaft area, the opposite end portion of said bore having a sliding fit with said shaft area, a shaft seal positioned in each end portion of the bushing bore, said shaft being formed with passages extending axially from one end of said shaft, each of said passages serving for the conveyance of hydraulic pressure against the bore of a bushing intermediate said seals therein and the shaft area on which the bushing is mounted for the expansion of the bushing and removal thereof from the shaft area.
Claim 5
Dependent Claim
27 words
A rotor structure as defined in claim 1, wherein the bore of each of said bushings is formed intermediate the seals therein with a circumferentially extending groove.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |