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US4218182A
Expired / Lapsed
US
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Casings of hydraulic machines
Assignee: Toshiba Corp
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Filing: 1978-10-06
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Granted: 1980-08-19
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Expires: 1998-10-06
Abstract
Abstract In a casing of a hydraulic machine of the type comprising a stay ring including a pair of opposing annular plates and a plurality of stay vanes fixed therebetween to form stay vane flow passages between the stay vanes, and a spiral case disposed on the radially outside of the stay ring, the stay vane passages and the spiral case are proportioned such that the ratio n of the area 2π R o B of a circle encircling the outer periphery of the stay vanes and the cross-sectional area π R s 2 of the flow passage in the spiral case is from 1.9 to 2.5, and that the ratio (R-R o ) /R s =l is larger than 0.75 where R s represents the radius of the cross-section of the flow passage in the spiral case taken along a plane containing the axis of the shaft of the hydraulic machine and intersecting at right angles with the axis of an inlet to the spiral case, R the distance between the axis of the shaft and the center of the flow passage in the spiral case, R o the radius of the stay vanes to the outer periphery thereof, and B the height of the stay vane flow passages at the periphery of the stay vanes.
Inventors
- 👤 Sachio Tsunoda
- 👤 Kiyoshi Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:13
CPC Classifications
F; F03; F03B; F03B3/00; F03B3/16; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
220 words
In a casing of a hydraulic machine forming a turbine of the type comprising a stay ring including a pair of opposing annular plates and a plurality of stay vanes fixed therebetween to form stay vane flow passages between said stay vanes, and a spiral case disposed on the radially outside of said stay ring, the improvement wherein said stay vane passages and said spiral case are proportioned such that the ratio of n of the area 2πR o B of a circle encircling the outer periphery of said stay vanes and the cross-sectional area πR s 2 of the flow passage in said spiral case is from 1.5 to 2.1, and that the ratio (R-R o )/R s =l is larger than 0.75 where R s represents the radius of the cross-section of the flow passage in said spiral case taken along a plane containing the axis of the shaft of said hydraulic machine and intersecting at right angles with the axis of an inlet to said spiral case, R the distance between the axis of said shaft and the center of said flow passage in said spiral case, R o the radius of said stay vanes to the outer periphery thereof, and B the height of the stay vane flow passages at the periphery of said stay vanes.
Claim 2
Dependent Claim
220 words
In a casing of a hydraulic machine forming a turbine of the type comprising a stay ring including a pair of opposing annular plates and a plurality of stay vanes fixed therebetween to form stay vane flow passages between said stay vanes, and a spiral case disposed on the radially outside of said stay ring, the improvement wherein said stay vane passages and said spiral case are proportioned such that the ratio of n of the area 2πR o B of a circle encircling the outer periphery of said stay vanes and the cross-sectional area πR s 2 of the flow passage in said spiral case is from 1.5 to 2.1, and that the ratio (R-R o )/R s =l is larger than 0.75 where R s represents the radius of the cross-section of the flow passage in said spiral case taken along a plane containing the axis of the shaft of said hydraulic machine and intersecting at right angles with the axis of an inlet to said spiral case, R the distance between the axis of said shaft and the center of said flow passage in said spiral case, R o the radius of said stay vanes to the outer periphery thereof, and B the height of the stay vane flow passages at the periphery of said stay vanes.
Claim 3
Dependent Claim
220 words
In a casing of a hydraulic machine forming a pump turbine of the type comprising a stay ring including a pair of opposing annular plates and a plurality of stay vanes fixed therebetween to form stay vane flow passages between said stay vanes, and a spiral case disposed on the radially outside of said stay ring, the improvement wherein said stay vane passages and said spiral case are proportioned such that the ratio n of the area 2πR o B of a circle encircling the outer periphery of said stay vanes and the cross-sectional area πR s 2 of the flow passage in said spiral case is from 1.9 to 2.5, and that the ratio (R-R o )/R s =l is larger than 0.75 where R s represents the radius of the cross-section of the flow passage in said spiral case taken along a plane containing the axis of the shaft of said hydraulic machine and intersecting at right angles with the axis of an inlet to said spiral case, R the distance between the axis of said shaft and the center of said flow passage in said spiral case, R o the radius of said stay vanes to the outer periphery thereof, and B the height of the stay vane flow passages at the periphery of said stay vanes.
Claim 4
Dependent Claim
220 words
In a casing of a hydraulic machine forming a pump turbine of the type comprising a stay ring including a pair of opposing annular plates and a plurality of stay vanes fixed therebetween to form stay vane flow passages between said stay vanes, and a spiral case disposed on the radially outside of said stay ring, the improvement wherein said stay vane passages and said spiral case are proportioned such that the ratio n of the area 2πR o B of a circle encircling the outer periphery of said stay vanes and the cross-sectional area πR s 2 of the flow passage in said spiral case is from 1.9 to 2.5, and that the ratio (R-R o )/R s =l is larger than 0.75 where R s represents the radius of the cross-section of the flow passage in said spiral case taken along a plane containing the axis of the shaft of said hydraulic machine and intersecting at right angles with the axis of an inlet to said spiral case, R the distance between the axis of said shaft and the center of said flow passage in said spiral case, R o the radius of said stay vanes to the outer periphery thereof, and B the height of the stay vane flow passages at the periphery of said stay vanes.
Claim 5
Dependent Claim
70 words
The hydraulic machine according to claim 1 wherein the profile of each stay vane at portions between its outer edge and a position at 0.9 R o is made asymmetrical so that an angle α 2 between the outer surface of said portions and a tangent to said circle encircling said stay vanes is smaller than an angle α 1 between the inner surface of said portions and said tangent.
Claim 6
Dependent Claim
29 words
The hydraulic machine according to claim 1 wherein the distance between said opposing annular plates increases gradually from the inner periphery toward the outer periphery of said stay vanes.
Claim 7
Dependent Claim
29 words
The hydraulic machine according to claim 4 wherein the angle substended by opposing inner surfaces of said annular plates is selected to be in a range of from 6°-20°.
Claim 8
Dependent Claim
24 words
The hydraulic machine according to claim 4 wherein the opposing inner surfaces of said annular plates are defined by a frustum of a cone.
Claim 9
Dependent Claim
24 words
The hydraulic machine according to claim 4 wherein the opposing inner surfaces of said annular plates are defined by a frustum of a pyramid.
References Cited (Backward Citations)
US2944786A
Cited
US3186685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |