US3788765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low specific speed compressor
Assignee: Delaval Turbine California Inc
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Filing: 1971-11-18
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Granted: 1974-01-29
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Expires: 1991-11-18
Abstract
Abstract Wedge-type vanes, or vanes with increasing thickness from inlet to exit facilitate the layout of aerodynamically favorable flow channels in application to small diameter low specific speed compressor wheels. The channels may have various cross sections including rectangular, square, oval or circular. The channels may be backwardly bent, straight, or s-shaped in form. Streamlining the pressure side of the vanes at the exit helps to reduce exit wake losses. A local restriction may be provided in the channel axial width at the exit to correct for the area increase created by the streamlining at the exit. An extension at the trailing side of the exit to follow the shape of the streamlined pressure side of the following vane may be provided for better control of the channel exit area and better direction of the flow.
Inventors
- 👤 V Rusak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:36
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
A low specific speed centrifugal compressor comprising a housing having a fluid receiving outer chamber and an inner impeller receiving chamber, an impeller having vanes rotatably supported in said impeller chamber for discharging into said outer chamber, said impeller having axially spaced annular discs supporting said vanes to define therewith a plurality of pumping flow channels, said vanes extending from a central eye to adjacent the periphery of said discs, each of said vanes being defined by a continuously smooth inclined pumping face and a continuously smooth inclined suction face, each of said vanes having continuously increasing cross-sectional thickness in a radially outward direction to present a wedge-shaped configuration in radial section, said channels being of substantially constant cross-sectional area throughout their length, said vanes having rounded entrance edges and a rounded convex curvature in the pumping face adjacent the periphery of said impeller, and said inclined surfaces merging into a trailing end, whereby the fluid pumped by said vanes moves from the central eye to the periphery of the impeller smoothly and with a minimum of turbulence through the pumping channels.
Claim 2
Dependent Claim
182 words
A low specific speed centrifugal compressor comprising a housing having a fluid receiving outer chamber and an inner impeller receiving chamber, an impeller having vanes rotatably supported in said impeller chamber for discharging into said outer chamber, said impeller having axially spaced annular discs supporting said vanes to define therewith a plurality of pumping flow channels, said vanes extending from a central eye to adjacent the periphery of said discs, each of said vanes being defined by a continuously smooth inclined pumping face and a continuously smooth inclined suction face, each of said vanes having continuously increasing cross-sectional thickness in a radially outward direction to present a wedge-shaped configuration in radial section, said channels being of substantially constant cross-sectional area throughout their length, said vanes having rounded entrance edges and a rounded convex curvature in the pumping face adjacent the periphery of said impeller, and said inclined surfaces merging into a trailing end, whereby the fluid pumped by said vanes moves from the central eye to the periphery of the impeller smoothly and with a minimum of turbulence through the pumping channels.
Claim 3
Dependent Claim
191 words
A low specific speed centrifugal compressor, comprising a housing having a fluid receiving outer chamber and an inner impeller receiving chamber, an impeller having vanes rotatably supported in said impeller chamber for discharging into said outer chamber, said impeller having axially spaced annular discs supporting said vanes to define therewith a plurality of pumping flow channels, said vanes extending from a central eye to adjacent the periphery of said discs, each of said vanes being defined by a continuously smooth convex pumping face and a coninuously smooth concave suction face, each of said vanes having continuously increasing cross-sectional thickness in a radially outward direction to present a wedge-shaped configuration in radial section, said channels being of substantially constant cross-sectional area throughout their length, said vanes having rounded entrance edges and a rounded portion with a pronounced increase in convex curvature in the pumping face adjacent the periphery of said impeller, and said convex and concave surfaces merging into a rounded trailing end whereby the fluid pumped by said vanes moves from the central eye to the periphery of the impeller smoothly and with a minimum of turbulence through the pumping channels.
Claim 4
Dependent Claim
191 words
A low specific speed centrifugal compressor, comprising a housing having a fluid receiving outer chamber and an inner impeller receiving chamber, an impeller having vanes rotatably supported in said impeller chamber for discharging into said outer chamber, said impeller having axially spaced annular discs supporting said vanes to define therewith a plurality of pumping flow channels, said vanes extending from a central eye to adjacent the periphery of said discs, each of said vanes being defined by a continuously smooth convex pumping face and a coninuously smooth concave suction face, each of said vanes having continuously increasing cross-sectional thickness in a radially outward direction to present a wedge-shaped configuration in radial section, said channels being of substantially constant cross-sectional area throughout their length, said vanes having rounded entrance edges and a rounded portion with a pronounced increase in convex curvature in the pumping face adjacent the periphery of said impeller, and said convex and concave surfaces merging into a rounded trailing end whereby the fluid pumped by said vanes moves from the central eye to the periphery of the impeller smoothly and with a minimum of turbulence through the pumping channels.
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |