Global Patent Index - EP 0985803 A1

EP 0985803 A1 2000-03-15 - Turbine stage with radial inlet and axial outlet

Title (en)

Turbine stage with radial inlet and axial outlet

Title (de)

Turbinenstufe mit radialer Zuströmung und axialer Abströmung

Title (fr)

Etage de turbine avec entrée radiale et sortie axiale

Publication

EP 0985803 A1 (DE)

Application

EP 98810899 A

Priority

EP 98810899 A

Abstract (en)

At the turbine step, in a steam turbine, the working medium is deflected from an inflow spiral (41) through the inflow channel (40) into a radial direction by a guide grid (Le). At the following downstream flow channel (50), the flow is deflected so that it has an axial flow through the following turbine wheel (La). The structure of the wall contours (27,28) of the housing (20) and hub (21) give the main flow line (51) initially a direction component which is radially outwards and then, shortly before the turbine wheel (La), a pure axial alignment. The flow through the turbine wheel (La) is homogenized by a curvature which is against the original deflection curvature. The kink points (AA,BB) at the channel wall (28), at the hub side, are downstream of the corresponding kink points (A,B) at the housing side of the channel. The flow is additionally homogenized by the divergent-convergent channel contour structure.

Abstract (de)

Bei einer radialen-axialen Turbinenstufe strömt das Arbeitsmedium aus einer Zuströmspirale (41) durch einen Zuströmkanal (40) in radialer Richtung durch ein Leitgitter (Le). In einem stromab folgenden Überströmkanal (50) wird die Strömung so umgelenkt, dass das nachgeschaltete Laufrad (La) in axialer Hauptströmungsrichtung durchströmt wird. Durch eine zweckmässige Gestaltung der Wandkonturen (27,28) von Gehäuse (20) und Nabe (21) wird die Hauptstromlinie (51) zunächst mit einer radial nach aussen weisenden Komponente geführt, und vor dem Laufrad (La) wieder rein axial ausgerichtet. Hierdurch entsteht eine der ursprünglichen Umlenkung entgegengerichtete Krümmung der Hauptstromlinie, durch die die Zuströmung zum Laufrad (La) homogenisiert wird. Die Knickstellen (AA, BB) der nabenseitigen Kanalwand (28) werden zweckmässig stromab den korrespondierenden gehäuseseitigen Knickstellen (A, B) angeordnet. Die hierdurch entstehende divergent-konvergente Kanalkontur fördert die Homogenisierung der Laufradanströmung zusätzlich. <IMAGE>

IPC 1-7 (main, further and additional classification)

F01D 9/04; F01D 1/04

IPC 8 full level (invention and additional information)

F01D 1/04 (2006.01); F01D 9/04 (2006.01)

CPC (invention and additional information)

F01D 1/04 (2013.01); F01D 9/048 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

EP 0985803 A1 20000315; EP 0985803 B1 20030402; DE 59807746 D1 20030508

INPADOC legal status


2005-09-10 [PG25 IT] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: IT

- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

- Effective date: 20050910

2005-04-01 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: DE

- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

- Effective date: 20050401

2004-03-24 [26N] NO OPPOSITION FILED

- Effective date: 20040105

2004-02-27 [EN] FR: TRANSLATION NOT FILED

2003-10-01 [GBV] GB: EP PATENT (UK) TREATED AS ALWAYS HAVING BEEN VOID IN ACCORDANCE WITH GB SECTION 77(7)/1977

- Effective date: 20030402

2003-09-03 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: DE

- Payment date: 20030903

- Year of fee payment: 6

2003-05-08 [REF] CORRESPONDS TO:

- Document: DE 59807746 P 20030508

2003-04-02 [AK] DESIGNATED CONTRACTING STATES:

- Designated State(s): DE FR GB IT

2003-04-02 [REG GB FG4D] EUROPEAN PATENT GRANTED

- Free text: NOT ENGLISH

2003-04-02 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: FR

- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20030402

2003-04-02 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: GB

- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20030402

2002-11-27 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: ALSTOM (SWITZERLAND) LTD

2002-01-02 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: ALSTOM

2000-11-22 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: DE FR GB IT

2000-11-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000902

2000-03-15 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT

2000-03-15 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI