US3754836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam turbines
Assignee: Rolls Royce Power Engineering PLC
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Filing: 1972-03-28
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Granted: 1973-08-28
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Expires: 1992-03-28
Abstract
Abstract In an axial flow steam turbine, erosion of stator blade supporting structure is minimised in wet steam regions by injecting high pressure dry steam into the turbine by way of the said structure in such a way that the vulnerable areas of the structure are protected from the wet motive steam by the injected dry steam.
Inventors
- 👤 J Bolter
- 👤 H Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:49
CPC Classifications
F; F01; F01K; F01K7/00; F01K7/16; F01K7/22; F01K7/226; F01D; F01D25/00; F01D25/24; F01D25/26; F01D3/00; F01D3/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
An axial flow steam turbine comprising a plurality of bladed rotor wheels and associated rings of stationary blades mounted within a stator casing, in which turbine a group of adjacent stator blade rings is carried by a carrier ring supported by way of a support arrange-ment at its outer periphery by the stator casing and in which means are provided to inject dry steam at the carrier ring support arrangement.
Claim 2
Dependent Claim
70 words
An axial flow steam turbine comprising a plurality of bladed rotor wheels and associated rings of stationary blades mounted within a stator casing, in which turbine a group of adjacent stator blade rings is carried by a carrier ring supported by way of a support arrange-ment at its outer periphery by the stator casing and in which means are provided to inject dry steam at the carrier ring support arrangement.
Claim 3
Dependent Claim
70 words
An axial flow steam turbine as claimed in claim 1, in which the support arrangement for the carrier ring comprises a circumferentially extending tongue on the radially outer periphery of the carrier ring locating within a corresponding groove formed in the stator casing, there being a space formed at the bottom of the groove leading into which space a duct or ducts for the injection of dry steam are provided.
Claim 4
Dependent Claim
21 words
An axial flow steam turbine as claimed in claim 2, in which the said ducts pass through the stator casing wall.
Claim 5
Dependent Claim
87 words
An axial flow steam turbine as claimed in claim 1, in which the support arrangement for the carrier ring comprises a circumferentially extending tongue on the radially outer periphery of the carrier ring locating within the corresponding groove formed in the stator casing, there being a circumferential channel of substantial cross-section formed extending around the tongue and groove arrangement into which channel at least one duct for injection into the channel of dry steam is led, the said duct or ducts extending through the stator casing wall.
Claim 6
Dependent Claim
104 words
An axial flow steam turbine as claimed in claim 1, in which the support arrangement for the carrier ring comprises a circumferentially extending tongue on the radially outer periphery of the carrier ring locating within a corresponding groove formed in the stator casing, there being a space formed at the bottom of the groove leading into which spaced at least two circumferentially spaced radially extending ducts for the injection of dry steam are provided, and there being provided a circumferentially extending supply duct for dry steam situated outside the stator casing wall, the said radially extending ducts communicating with the said circumferentially extending duct.
Claim 7
Independent Claim
60 words
A method of reducing corrosion in a steam turbine of the type described hereinbefore in which dry steam is injected into a support arrangement for a stator blade ring in a region of the turbine where the motive steam contains water particles, the dry steam for injection being at a higher pressure than the motive steam in the said region.
Claim 8
Independent Claim
60 words
A method of reducing corrosion in a steam turbine of the type described hereinbefore in which dry steam is injected into a support arrangement for a stator blade ring in a region of the turbine where the motive steam contains water particles, the dry steam for injection being at a higher pressure than the motive steam in the said region.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |