US5236308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade fastening arrangement
Assignee: Alstom SA
•
Filing: 1992-06-18
•
Granted: 1993-08-17
•
Expires: 2012-06-18
Abstract
Abstract In a rotor blade fastening arrangement in the drum rotor of an axial flow turbomachine, the blades are fastened by means of their roots in rows in peripheral blade grooves with support indentations at the side. The blade groove provided for the first blade row is an L groove with two vertical support surfaces and one horizontal support indentation. The blade root engaging in it consists of a vertical protrusion and only one horizontal protrusion to the side.
Inventors
- 👤 Andreas Czeratzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:43
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3023; F01D5/303; F01D5/3038; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
An axial flow turbomachine comprising: a rotor defining a substantially axial gas flow path from an upstream end of the rotor toward a downstream end of the rotor; a plurality of axially spaced rows of peripheral blade grooves in said rotor, wherein only an upstreammost one of said grooves is L-shape in section and at least one of remaining ones of said grooves is inverted T-shape in section; and rotor blades fitted in said grooves and having sections complementary to the groove sections in which the respective blades are fitted.
Claim 2
Dependent Claim
90 words
An axial flow turbomachine comprising: a rotor defining a substantially axial gas flow path from an upstream end of the rotor toward a downstream end of the rotor; a plurality of axially spaced rows of peripheral blade grooves in said rotor, wherein only an upstreammost one of said grooves is L-shape in section and at least one of remaining ones of said grooves is inverted T-shape in section; and rotor blades fitted in said grooves and having sections complementary to the groove sections in which the respective blades are fitted.
Claim 3
Dependent Claim
19 words
The turbomachine of claim 1 wherein all of the remaining ones of said grooves are inverted T-shape in section.
Claim 4
Dependent Claim
23 words
The turbomachine of claim 1, wherein said upstreammost one of said grooves has two vertical support surfaces and only one horizontal support surface.
Claim 5
Dependent Claim
36 words
The turbomachine of claim 1 wherein one of said vertical support surfaces is flush with the peripheral surface of the rotor and the other of said vertical support surfaces is adjacent a bottom of the groove.
References Cited (Backward Citations)
DE570754C
Cited
US888500A
Cited
US1466324A
Cited
DE691800C
Cited
US2327839A
Cited
US2295012A
Cited
US3475108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |