Patent US3756744A successfully refreshed from Google Patents.
US3756744A
Expired / Lapsed
US
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Axial water flow machines
Assignee: English Electric Co Ltd
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Filing: 1971-01-21
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Granted: 1973-09-04
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Expires: 1991-01-21
Abstract
Abstract In an axial water flow pump or turbine in which the runner comprises a hub, vanes extending radially from the hub, and a rim disposed around the vanes for example for carrying an electrical rotor, the rim is attached to the hub by tie bars. Preferably one tie bar is associated with each vane and extends through a bore or slot formed in the vane. Whilst tangential forces can be transmitted between the rim and the hub by the vanes, radial forces are carried by the tie bars. Thus bending stresses to which the rim is subjected are reduced, the rim will remain more nearly circular and radial clearance between the rim and its surroundings can be reduced.
Inventors
- 👤 M Braikevitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
F; F03; F03B; F03B3/00; F03B3/12; F03B3/126; F04; F04D; F04D29/00; F04D29/18; F04D29/181; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A runner for an axial water flow machine, including: a hub; a plurality of vanes extending generally radially from the hub; a peripheral drive member disposed circumferentially around the vanes and held axially and circumferentially by the radially extending outer end of each vane, but being movable radially relative to the radially extending outer end of each vane; and a plurality of tie members each connected at one end to the hub and at the other end to the drive member and arranged to locate the drive member radially relative to the hub.
Claim 2
Dependent Claim
93 words
A runner for an axial water flow machine, including: a hub; a plurality of vanes extending generally radially from the hub; a peripheral drive member disposed circumferentially around the vanes and held axially and circumferentially by the radially extending outer end of each vane, but being movable radially relative to the radially extending outer end of each vane; and a plurality of tie members each connected at one end to the hub and at the other end to the drive member and arranged to locate the drive member radially relative to the hub.
Claim 3
Dependent Claim
25 words
A runner according to claim 1, wherein each tie member comprises a radially extending tie bar, each tie bar being associated with a respective vane.
Claim 4
Dependent Claim
18 words
A runner according to claim 2, wherein each tie bar passes through a bore in its respective vane.
Claim 5
Dependent Claim
15 words
A runner according to claim 3, wherein each vane is rotatable about its tie bar.
Claim 6
Dependent Claim
19 words
A runner according to claim 2, wherein each tie bar is disposed in a slot in its respective vane.
Claim 7
Dependent Claim
21 words
A runneR according to claim 5, wherein a fairing is associated with each slot for preserving the contour of the vane.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |