Patent EP0219964A1 successfully refreshed from Google Patents.
Patent US4243357A successfully refreshed from Google Patents.
US4243357A
Expired / Lapsed
US
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Turbomachine
Assignee: Cummins Inc
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Filing: 1979-08-06
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Granted: 1981-01-06
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Expires: 1999-08-06
Abstract
Abstract A turbomachine, operable as a compressor or a turbine, for a compressible fluid is provided which includes a wheel having a plurality of vanes extending from a generally axial flow section to a generally radial flow section. Adjacent vanes define fluid passageways having a generally axially oriented section and a generally radially oriented section. Located substantially within the generally radially oriented sections of a predetermined number of passageways is a reference station which has a configuration such that the mean tangential dimension of said passageway at said reference station is no more than about 60% of the circumference of the rotor at that mean radius divided by the number of vanes at that radius. Each reference station serves to effect substantial attachment of the flowing fluid to the surfaces defining said passageway, particularly at low mass flow, and, thus, broaden the usable flow range of the turbomachine. A rounded vane end at the wheel periphery further serves to enhance said attachment.
Inventors
- 👤 Patrick F. Flynn
- 👤 Harold G. Weber
- 👤 John M. Mulloy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:28
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/04; F01D5/043; F01D5/048
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
166 words
A turbomachine for compressible fluids comprising a rotor mounted for rotation about a substantially central transverse axis, said rotor including a hub, and a plurality of vanes mounted on and projecting from one surface of said hub, each vane being between the rotor axis and the rotor periphery and having a generally rounded vane end at said periphery smoothly merging with said vane, adjacent vanes coacting to define at least in part a fluid passageway having a generally axially oriented section adjacent the rotor axis and a generally radially oriented section extending from said axially oriented section to the rotor periphery; a predetermined number of passageways each having a reference station provided with a generally tangentially oriented construction and disposed within the radially oriented section thereof, the passageway configuration at said reference station having a mean tangential dimension that is no more than about 60% of the mean circumference of the rotor measured at said reference station divided by the number of vanes intersecting said circumference.
Claim 2
Dependent Claim
166 words
A turbomachine for compressible fluids comprising a rotor mounted for rotation about a substantially central transverse axis, said rotor including a hub, and a plurality of vanes mounted on and projecting from one surface of said hub, each vane being between the rotor axis and the rotor periphery and having a generally rounded vane end at said periphery smoothly merging with said vane, adjacent vanes coacting to define at least in part a fluid passageway having a generally axially oriented section adjacent the rotor axis and a generally radially oriented section extending from said axially oriented section to the rotor periphery; a predetermined number of passageways each having a reference station provided with a generally tangentially oriented construction and disposed within the radially oriented section thereof, the passageway configuration at said reference station having a mean tangential dimension that is no more than about 60% of the mean circumference of the rotor measured at said reference station divided by the number of vanes intersecting said circumference.
Claim 3
Dependent Claim
22 words
The turbomachine of claim 1 wherein the passageway configuration at each reference station has an axial dimension that exceeds the tangential dimension.
Claim 4
Dependent Claim
79 words
The turbomachine of claim 1 wherein a surface portion of one of the vanes disposed within the radially oriented passageway section has a generally convex configuration and is adjacent a pressure side of the fluid flow through the radially oriented passageway section, and a surface portion of one of the vanes disposed within the axially oriented passageway section has a generally concave configuration and is adjacent a pressure side of the fluid flow through the axially oriented passageway section.
Claim 5
Dependent Claim
37 words
The turbomachine of claim 1 wherein the portion of a passageway extending from the generally axially oriented section to the reference station has a mean tangential dimension decreasing towards the mean tangential dimension at said reference station.
Claim 6
Dependent Claim
36 words
The turbomachine of claim 1 wherein the portion of a passageway extending from the reference station to the rotor periphery has an increasing means tangential dimension relative to the mean tangential dimension at said reference station.
Claim 7
Dependent Claim
27 words
The turbomachine of claim 1 wherein the portion of each vane starting from the axially oriented section to the reference station has an increasing tangential cross-sectional area.
Claim 8
Dependent Claim
26 words
The turbomachine of claim 1 wherein the vanes are symmetrically arranged on said hub surface and said reference stations are uniformly spaced from the rotor axis.
Claim 9
Dependent Claim
38 words
The turbomachine of claim 1 wherein the edges of said vanes spaced from the hub surface are fixedly secured to an imperforate shroud whereby said shroud, said vanes and said hub surface coact to form said fluid passageways.
Claim 10
Dependent Claim
19 words
The turbomachine of claim 1 wherein each vane end adjacent the rotor periphery has a generally semi-circular cross-sectional configuration.
Claim 11
Dependent Claim
39 words
The turbomachine of claim 1 wherein the generally radially oriented flow port section constitutes a flow inlet section and each vane end adjacent the rotor periphery is curved toward the direction of the incoming fluid relative to the vane.
Claim 12
Dependent Claim
68 words
The turbomachine of claim 1 wherein the portion of a passageway extending from the generally axially oriented section to the reference station has a mean tangential dimension decreasing towards the mean tangential dimension at said reference station and the portion of said passageway extending from the reference station to the rotor periphery has an increasing mean tangential dimension relative to the mean tangential dimension at said reference station.
Claim 13
Dependent Claim
29 words
The turbomachine of claim 1 wherein the axial dimension of each passageway is increased proximate said reference station to compensate for the passageway area reduction resulting from said construction.
Claim 14
Dependent Claim
42 words
The turbomachine of claim 1 wherein the rotor is mounted within a circular cavity formed in a housing, said housing having a generally axially oriented flow port section and a generally radially oriented flow port section, said sections communicating with said cavity.
Claim 15
Dependent Claim
33 words
The turbomachine of claim 13 wherein one end of each vane is disposed adjacent one flow port section and an opposite end of each vane is disposed adjacent the other flow port section.
Claim 16
Dependent Claim
25 words
The turbomachine of claim 13 wherein each passageway extending from one flow port section to the other flow port section is substantially continuous and undivided.
Claim 17
Dependent Claim
18 words
The turbomachine of claim 13 wherein the vanes of said rotor sealingly engage cavity-forming surfaces of said housing.
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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |