Patent US4175240A successfully refreshed from Google Patents.
Patent US3884595A successfully refreshed from Google Patents.
US3884595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller and shaft assembly
Assignee: Dresser Industries Inc
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Filing: 1974-05-15
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Granted: 1975-05-20
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Expires: 1994-05-15
Abstract
Abstract The improved impeller and shaft assembly of this invention is useful in centrifugal compressors or the like. The impeller includes a hub portion that has each end provided with a plurality of radially spaced axially extending slots. As the impeller and shaft come up to speed in the compressor, the centrifugal or outward force generated tends to enlarge the impeller bore due to the mass of the impeller. As the central portion of the hub, which is connected with the disk, cover and vanes and thus has the largest mass, enlarges the slotted portion on each end of the hub is biased inwardly toward the shaft. Thus, as the compressor speed increases, the end portions of the hub are biased into tighter gripping engagement with the shaft preventing radial movement of the impeller relative to the shaft.
Inventors
- 👤 David B Herrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:45
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/266
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
An improved impeller and shaft assembly for use in centrifugal compressors or the like comprising: an elongated, generally cylindrical shaft; And, an impeller located on and rotatable with said shaft, said impeller including a hub portion having first and second ends, a bore sized to closely receive said shaft and extending through said ends, a disk portion spaced axially inwardly from said ends and projecting radially outwardly from said hub portion, and a plurality of radially spaced slots in said hub portion extending axially inwardly from said ends toward said disk portion whereby the centrifugal or outward radial force generated by rotation of said assembly, which tends to enlarge said bore, causes a radially inwardly directed force on said hub portion adjacent said slots biasing said slotted end portions into tighter gripping engagement with said shaft.
Claim 2
Dependent Claim
136 words
An improved impeller and shaft assembly for use in centrifugal compressors or the like comprising: an elongated, generally cylindrical shaft; And, an impeller located on and rotatable with said shaft, said impeller including a hub portion having first and second ends, a bore sized to closely receive said shaft and extending through said ends, a disk portion spaced axially inwardly from said ends and projecting radially outwardly from said hub portion, and a plurality of radially spaced slots in said hub portion extending axially inwardly from said ends toward said disk portion whereby the centrifugal or outward radial force generated by rotation of said assembly, which tends to enlarge said bore, causes a radially inwardly directed force on said hub portion adjacent said slots biasing said slotted end portions into tighter gripping engagement with said shaft.
Claim 3
Dependent Claim
23 words
The improved impeller and shaft assembly of claim 1 and also including means engaging said shaft and impeller for preventing relative rotation therebetween.
Claim 4
Dependent Claim
43 words
The improved assembly of claim 2 wherein said means includes: radially aligned slots in the hub portion of said impeller adjacent said bore and in said shaft; and, a key member disposed in said aligned slots in engagement with said impeller and shaft.
Claim 5
Dependent Claim
146 words
The improved assembly of claim 1 and also including a second impeller located on and rotatable with said shaft adjacent said first mentioned impeller, said second impeller having first and second ends, a bore sized to closely receive said shaft and extending through said ends, a disk portion projecting radially outwardly from said hub portion and spaced axially inwardly from said ends, and a plurality of radially spaced slots in said hub portion extending axially inwardly from said ends toward said disk portion whereby the centrifugal or outward radial force generated by rotation of said assembly, which tends to enlarge said bore, causes a radially inwardly directed force on said hub portion adjacent said slots gripping said shaft, the slotted first end on said second rotor being in mesh with the slotted second end on said first mentioned rotor whereby said rotors rotate as a unit.
Claim 6
Dependent Claim
29 words
The improved assembly of claim 4 and also including means engaging said shaft and at least one of said rotors for preventing relative rotation between said shaft and rotors.
Claim 7
Dependent Claim
47 words
The improved assembly of claim 5 wherein said means includes: radially aligned slots in said shaft and in the hub portion of said first mentioned rotor adjacent said bore; and, a key member disposed in said aligned slots in engagement with said shaft and first mentioned rotor.
References Cited (Backward Citations)
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |