US3728042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial positioner and seal for cooled rotor blade
Assignee: Westinghouse Electric Corp
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Filing: 1971-08-27
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Granted: 1973-04-17
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Expires: 1991-08-27
Abstract
Abstract An axial positioning and sealing means for axially positioning turbine blades with respect to a rotor disc and for sealing the downstream side of cooling fluid flow passageways below the root portions of the blades is disclosed. The periphery of the rotor disc is provided with axial channels for receiving the root portions of turbine blades having radial cooling bores extending from the root portions through the tips of the blades. The channels are formed to provide an axially extending passageway communicating with the cooling bores whereby a cooling fluid flows through the passageway and into the bores to cool the plates. Sideplates means are provided for retaining the blades to the rotor disc. Pads or protrusions are provided on each steeple of the rotor disc, with the pads being positioned and shaped such that the side faces of two adjacent pads define a radially extending, radially outwardly tapering channel over each of the passageways. Each positioning and sealing plate has tapered sides complementary in shape to the tapered channel whereby when said rotor disc is rotated at high speeds, the centrifugal force acting on said plate will urge the plate radially outwardly of the rotor disc to thereby wedge the plate against the pad and the root portion of the turbine blades. Locking means are provided for securing each plate against unlimited radial inward movement with respect to the rotor disc.
Inventors
- 👤 B Hugoson
- 👤 N Vettel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:56
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/32; F01D5/326; F01D5/02; F01D5/08; F01D5/081
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
247 words
In a rotor for an axial flow fluid machine, the rotor comprising at least one rotor disc with slots Provided in the periphery thereof for receiving the root portions of rotor blades, said slots defining steeples therebetween, said rotor blades having radial cooling bores extending from the root portions through the tips of the blades, passageways extending axially of the root portions, said passageways communicating with the cooling bores and being capable of conducting a flow of cooling fluid therethrough, and sideplate means associated with said blades for securing said blades to said rotor disc, the improvement comprising: an axial positioning and sealing plate associated with each blade for positioning the blades axially with respect to said rotor disc and for sealing the downstream side of each of said passageways; pad means on each steeple of said rotor disc positioned and shaped such that the side faces of two adjacent pad means define a radially outwardly extending, radially outwardly converging tapering channel over each of said passageways; said plate being received in said channel and having tapering sides complementary in shape to said tapering channel whereby when said rotor disc is rotated at high speeds the centrifugal force acting on said plate will urge said plate radially outwardly of said rotor disc to thereby wedge said plate against said pad means and the root portions of the turbine blades; and locking means for securing said plate against unlimited radial inward movement with respect to said rotor disc.
Claim 2
Dependent Claim
247 words
In a rotor for an axial flow fluid machine, the rotor comprising at least one rotor disc with slots Provided in the periphery thereof for receiving the root portions of rotor blades, said slots defining steeples therebetween, said rotor blades having radial cooling bores extending from the root portions through the tips of the blades, passageways extending axially of the root portions, said passageways communicating with the cooling bores and being capable of conducting a flow of cooling fluid therethrough, and sideplate means associated with said blades for securing said blades to said rotor disc, the improvement comprising: an axial positioning and sealing plate associated with each blade for positioning the blades axially with respect to said rotor disc and for sealing the downstream side of each of said passageways; pad means on each steeple of said rotor disc positioned and shaped such that the side faces of two adjacent pad means define a radially outwardly extending, radially outwardly converging tapering channel over each of said passageways; said plate being received in said channel and having tapering sides complementary in shape to said tapering channel whereby when said rotor disc is rotated at high speeds the centrifugal force acting on said plate will urge said plate radially outwardly of said rotor disc to thereby wedge said plate against said pad means and the root portions of the turbine blades; and locking means for securing said plate against unlimited radial inward movement with respect to said rotor disc.
Claim 3
Dependent Claim
52 words
The structure recited in claim 1 in which the side faces of said pad means are bevelled in an axially convergent direction relative to the direction of fluid flow, and said plates are provided with bevelled side surfaces complementary in shape to the bevelling of said side faces of said pad means.
Claim 4
Dependent Claim
27 words
The structure as recited in claim 1 in which the side faces of said pad means and the sides of said plates are generally flat planar surfaces.
Claim 5
Dependent Claim
46 words
The structure as recited in claim 1 in which said plates are generally circular in shape with the sides thereof being generally spherically shaped, and the side faces of said pad means are generally spherically shaped complementary to the shape of said sides of said plates.
Claim 6
Dependent Claim
45 words
The structure as recited in claim 1 in which said lock1ng means is an elongated retaining member extending through a portion of each of said plates disposed radially outwardly relative to said pad means and arranged to engage said pad means to secure said plates.
Claim 7
Dependent Claim
61 words
The structure as recited in claim 1 in which said locking means includes a circumferential groove provided in said rotor disc radially inwardly of said pad means, and an elongatd retaining member extending through a portion of each of said plates disposed radially inwardly relative to said pad means and arranged to fit within said circumferential groove to secure said plates.
Claim 8
Dependent Claim
102 words
The structure as set forth in claim 2 in which the side faces of said pad means and the sides of said plates are generally flat planar surfaces, and the angle of the bevelling of said side faces of said pad means is greater relative to the axis of said rotor disc than the angle of the bevelling of the side surfaces of said plates, the difference of the angles being such that the downstream portions of the respective side surfaces of said plates and pad means engage each other while a clearance exists between the upstream of the respective side surfaces.
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |