US3578874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable runner seal
Assignee: Library and Archives Canada
•
Filing: 1969-08-29
•
Granted: 1971-05-18
•
Expires: 1989-08-29
Abstract
Abstract A hydraulic turbomachine such as a pump, pump turbine or Francis turbine having a shrouded runner is provided with sheared seals to minimize leakage through the shroud spaces, and seal access means, to permit servicing of the seals without removal of the runner from its housing, in the form of a service housing adjacent the throat and a crown service housing, permitting disassembly of the seals from within.
Inventors
- 👤 Robert Stanley Sproule
- 👤 Hugh Laurie Seybold
- 👤 Feodor Kanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:42
CPC Classifications
F; F03; F03B; F03B11/00; F03B11/006; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/165; F04D29/167; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A hydraulic turbomachine having a bladed runner mounted for rotation within a stationary housing and having at least one shroud portion, and axially retractable shroud seal means mounted in the housing in sealing relation with the shroud, including a plurality of seal segments forming a seal annulus in sealing relation with an annular surface of the shroud means, segment mounting means to position the segments within the housing, and keep means to secure the segments to the mounting Means, a service housing located axially adjacent the seal, within said stationary housing, and means to provide access thereto whereby the shroud seal may be serviced insitu.
Claim 2
Dependent Claim
105 words
A hydraulic turbomachine having a bladed runner mounted for rotation within a stationary housing and having at least one shroud portion, and axially retractable shroud seal means mounted in the housing in sealing relation with the shroud, including a plurality of seal segments forming a seal annulus in sealing relation with an annular surface of the shroud means, segment mounting means to position the segments within the housing, and keep means to secure the segments to the mounting Means, a service housing located axially adjacent the seal, within said stationary housing, and means to provide access thereto whereby the shroud seal may be serviced insitu.
Claim 3
Dependent Claim
35 words
The machine as claimed in claim 1, being of the Francis type having a crown shroud, said access means including a moveable portion of the machine head cover to provide access to said service housing.
Claim 4
Dependent Claim
55 words
The machine as claimed in claim 2, including an inner head cover within said stationary housing having at least a portion thereof moveable axially relative to the housing, to permit displacement of said moveable head cover portion inwardly from said service housing, relative to the runner main axis, whereby the service housing is made accessible.
Claim 5
Dependent Claim
41 words
The machine as claimed in claim 1, wherein each said seal segment has a working surface having a plurality of recesses extending thereacross in a direction substantially parallel with the direction of movement of the runner facing surface when in operation.
Claim 6
Dependent Claim
43 words
The machine as claimed in claim 2, wherein said head cover moveable portion comprises a segment of an annular barrel, the segmental walls thereof being inclined relative to the other segments to permit inward withdrawal of the segment towards the runner main axis.
Claim 7
Dependent Claim
41 words
The machine as claimed in claim 1, being of the Francis type and having a band shroud, said service housing being located adjacent the draft tube of the machine, to permit axial withdrawal of said seal means away from the runner.
Claim 8
Dependent Claim
49 words
The machine as claimed in claim 6, wherein said service housing in an annular chamber, at least one wall portion of said draft tube being moveable to provide access to said chamber to permit the installation of jacking means for the retraction of said seal means from the runner.
Claim 9
Dependent Claim
34 words
The machine as claimed in claim 7, having air admission means connected with said service housing, and fluid passage means extending from the housing to said draft tube to permit substantial pressure interchange therebetween.
References Cited (Backward Citations)
US1159868A
Cited
US1263561A
Cited
US1449006A
Cited
US1592441A
Cited
US1823702A
Cited
US3186684A
Cited
US3180613A
Cited
US3220696A
Cited
US3405913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |