US3825366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly for centrifugal blowers and the like
Assignee: Dresser Industries Inc
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Filing: 1972-07-31
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Granted: 1974-07-23
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Expires: 1992-07-31
Abstract
Abstract An improved rotor and shaft assembly for a centrifugal blower, compressor, or the like that includes a shaft constructed from a material having a first coefficient of thermal expansion and a rotor located on the shaft and constructed from a material having a second coefficient of thermal expansion that is greater than the first coefficient of thermal expansion. Abutments are provided on the shaft that engage the rotor hub to limit the thermal expansion of the rotor in the axial direction to the same expansion as that of the shaft and to convert any excess axial thermal expansion of the rotor into an inwardly deformation of the hub, whereby, the hub more tightly engages the shaft. The arrangement permits the rotor to be slipped onto the shaft during assembly and to be slipped off the shaft during disassembly while at the same time providing for the operation of the blower or compressor at elevated temperatures without loosening of the rotor on the shaft.
Inventors
- 👤 D Herrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:08
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32975
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
236 words
In a centrifugal blower, compressor or the like including a housing or stator, an improved rotor and shaft assembly comprising: a shaft constructed from a material having a first coefficient of thermal expansion and a longituding axis and arranged to be journaled in the housing; first and second rotors located on said shaft in spaced relationship, said rotors being rotatable with said shaft and being constructed from a material having a second coefficient of thermal expansion greater than said first coefficient of thermal coefficient, each said rotor including a hub having end portions and an axial bore therethrough sized to slidingly receive said shaft, each said bore having a portion of increased diameter adjacent each said end portion forming relatively flexible, inwardly and outwardly facing radial flanges on said hubs oriented toward said shaft; seal means on said shaft between said rotors engaging said inwardly facing radial flanges on said rotors and arranged in sealing relationship with the stator; first abutment means located on said shaft engaging one of said outwardly facing radial flanges; and, second abutment means adjustably located on said shaft engaging the other outwardly facing radial flange for initially deforming said radial flanges into engagement with said shaft and for converting thermal expansion of said rotors in the axial direction into radial deformation of said flanges toward said shaft, whereby said rotors tightly engage said shaft at elevated operating temperatures of said compressor.
Claim 2
Dependent Claim
236 words
In a centrifugal blower, compressor or the like including a housing or stator, an improved rotor and shaft assembly comprising: a shaft constructed from a material having a first coefficient of thermal expansion and a longituding axis and arranged to be journaled in the housing; first and second rotors located on said shaft in spaced relationship, said rotors being rotatable with said shaft and being constructed from a material having a second coefficient of thermal expansion greater than said first coefficient of thermal coefficient, each said rotor including a hub having end portions and an axial bore therethrough sized to slidingly receive said shaft, each said bore having a portion of increased diameter adjacent each said end portion forming relatively flexible, inwardly and outwardly facing radial flanges on said hubs oriented toward said shaft; seal means on said shaft between said rotors engaging said inwardly facing radial flanges on said rotors and arranged in sealing relationship with the stator; first abutment means located on said shaft engaging one of said outwardly facing radial flanges; and, second abutment means adjustably located on said shaft engaging the other outwardly facing radial flange for initially deforming said radial flanges into engagement with said shaft and for converting thermal expansion of said rotors in the axial direction into radial deformation of said flanges toward said shaft, whereby said rotors tightly engage said shaft at elevated operating temperatures of said compressor.
Claim 3
Dependent Claim
25 words
The compressor of claim 1 wherein each said radial flange includes a plurality of radially extending slots to further increase the flexibility of said flanges.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |