EP0265633B1
Expired / Lapsed
EP
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Axial turbine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1987-09-02
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Granted: 1991-02-06
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Expires: 2007-09-02
Abstract
No abstract record available.
Inventors
- 👤 Franz Kreitmeier
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:00
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/30; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
128 words
Axial flow turbine with reaction blading whose outlet rotor blades (14) with high Mach number flow are followed by a diffuser with axial outlet into an exhaust gas pipe (13), characterized in that the kink angles (α N , α Z ) of the diffuser inlet both at the hub and at the cylinder are fixed exclusively for the purpose of evening out the total pressure profile over the duct height at the outlet from the last rotor blade row, the kink angle (α Z ) of the outer limiting wall (9) of the diffuser opening toward the outside relative to the flow-limiting course on the blade carrier (2) of the turbine; and that means for removing swirl from the swirling flow are provided within the retardation zone.
Claim 2
Dependent Claim
128 words
Axial flow turbine with reaction blading whose outlet rotor blades (14) with high Mach number flow are followed by a diffuser with axial outlet into an exhaust gas pipe (13), characterized in that the kink angles (α N , α Z ) of the diffuser inlet both at the hub and at the cylinder are fixed exclusively for the purpose of evening out the total pressure profile over the duct height at the outlet from the last rotor blade row, the kink angle (α Z ) of the outer limiting wall (9) of the diffuser opening toward the outside relative to the flow-limiting course on the blade carrier (2) of the turbine; and that means for removing swirl from the swirling flow are provided within the retardation zone.
Claim 3
Dependent Claim
29 words
Turbine according to Claim 1, characterized in that the diffuser is subdivided in the radial direction into several partial diffusers (16) by means of sheet metal flow guides (15).
Claim 4
Dependent Claim
32 words
Turbine according to Claim 2, characterized in that the sheet metal guides (15) are single-piece rings without joint, some of the rings at least extending over the whole of the diffuser length.
Claim 5
Dependent Claim
33 words
Turbine according to Claim 1, characterized in that the diffuser end part in the plane of the outlet flow edge (18) of the means for removing swirl is designed as a Carnot diffuser.
Claim 6
Dependent Claim
46 words
Turbine according to Claim 1, characterized in that the means for removing the swirl within the diffuser consist of at least three flow ribs (17) which have thick profiles, are evenly distributed over the periphery and extend radially over the complete height of the flow duct.
Claim 7
Dependent Claim
31 words
Turbine according to Claim 5, characterized in that there is no cross-sectional expansion in the diffuser in the front region of the flow ribs (17) as far as their maximum thickness.
Claim 8
Dependent Claim
36 words
Turbine according to Claim 5, characterized in that the flow ribs (17), in their radial extension, have a hollow space (21) through which hollow space (21) the hub internals (22) of the diffuser can be reached.
Claim 9
Dependent Claim
47 words
Turbine according to Claims 3 and 5, characterized in that the flow ribs (17) form load-carrying bodies for the sheet metal guides (15) in such a way that the correspondingly cut out rings are fastened, preferably welded to the flow ribs (17) in their profile longitudinal extension.
Claim 10
Dependent Claim
43 words
Turbine according to Claim 5, characterized in that the front edge of the flow ribs (17) is located at a distance from the outlet plane of the turbine blading, in which there is a diffuser area ratio of at least 2, preferably 3.
Claim 11
Dependent Claim
39 words
Turbine according to Claim 8, characterized in that a part of the sheet metal guides (15) only extends in the machine longitudinal direction as far as the plane in which the flow ribs (17) have their maximum profile thickness.
Claim 12
Dependent Claim
65 words
Turbine according to Claim 7, characterized in that the diffuser is supported in an exhaust gas casing (5) which is bolted to the turbine casing (3), the hub-end inner exhaust gas casing parts (6) being connected to the outer exhaust gas casing parts (7) surrounding the diffuser by means of load-carrying ribs (8) which preferably penetrate the hollow space (21) of the flow ribs (17).
Claim 13
Dependent Claim
19 words
Turbine according to Claim 11, characterized in that the load-carrying ribs (8) are designed to be hollow and accessible.
Claim 14
Dependent Claim
26 words
Turbine according to Claim 11, characterized in that the inner and outer exhaust gas casing parts (6, 7) are designed as single-piece shell casings without joints.
Claim 15
Dependent Claim
23 words
Turbine according to Claim 11, characterized in that the exhaust gas casing/diffuser unit can be displaced axially into the exhaust gas pipe (13).
Claim 16
Dependent Claim
64 words
Turbine according to Claim 11, characterized in that to duct the cooling air the inner annular duct (24) formed by the inner exhaust gas casing part (6) and by the inner diffuser boundary wall (10) is connected to the outer annular duct (26) formed by the outer exhaust gas casing part (7) and the outer diffuser boundary wall (9) via the hollow space (21).
References Cited (Backward Citations)
No citation records indexed.
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