CH134451A - Device for reducing gap losses between turbine guide and impellers. - Google Patents
Device for reducing gap losses between turbine guide and impellers.Info
- Publication number
- CH134451A CH134451A CH134451DA CH134451A CH 134451 A CH134451 A CH 134451A CH 134451D A CH134451D A CH 134451DA CH 134451 A CH134451 A CH 134451A
- Authority
- CH
- Switzerland
- Prior art keywords
- impellers
- blades
- reducing gap
- gap losses
- turbine guide
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/406—Sealings between relatively-moving surfaces by means of fluid by at least one pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
- F01D5/225—Blade-to-blade connections, e.g. for damping vibrations by shrouding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/34—Rotor-blade aggregates of unitary construction, e.g. formed of sheet laminae
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/50—Building or constructing in particular ways
- F05D2230/54—Building or constructing in particular ways by sheet metal manufacturing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/30—Arrangement of components
- F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
- F05D2250/314—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being inclined in relation to each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/30—Retaining components in desired mutual position
Description
Vorrichtung zur Verminderung von Spaltverlusten zwischen Turbinenleit- und Laufrädern. Bei den Dampfturbinen neuester Kon struktionen, zum Beispiel wird das Achsial- spiel zwischen den Leit- und Laufra.dkränzen möglichst klein gehalten, um geringe Spalt verluste- zu erhalten. Auch labyrinthä.hn- liche Abdichtungen werden angeordnet, um diese Verluste zu beschränken.
Mit Rück sicht auf die WI ärmeausdehnungen des Rotors kann dieser Verlustquerschnitt doch nicht ganz beseitigt werden und bildet immer noch einen beträchtlichen Prozentsatz vom Schau- felungsquerschnitt.
Gemäss vorliegender Erfindung wird durch eine Ventilationsvorrichtung aussen an den Laufrädern ein Überdruckkissen erzeugt und damit eine elastische Abdichtung geschaffen, wodurch der Treibmitteldurchfluss verhindert und somit der Spaltverlust zwischen Leit- und Laufrädern behoben werden soll:.
Ausführungsbeispiele des Erfindungs- @egenstandes sind in beiliegender Zeichnung schematisch dargestellt. Fig. 1 ist ein liängsschnitt durch eine Leit- und Laufradschaufelung; Fig. 2, 3 und 4 sind Ansichten auf Laufradbandagen.
Bei dem Beispiel nach Fig. 1 und 2 sind a.m Laufrad 1, das sich in der angegebenen Pfeilrichtung dreht, beziehungsweise an der Bandage 2 Ventilationsschaufeln 3 und l angeordnet, deren Wirkungsdiagramm ent gegengesetzt ist. Bei der Rotation des Lauf rades entsteht somit zwischen den Schaufel reihen 3 und 4 im Ringraume 5 ein Über druckkissen, wodurch die Verlustströmung vom Spalt 6 nach dem Spalt 7 verhindert wird.
Der aus den Leitradsehaufeln 8 nach den Laufradschaufeln 9 in achsialer Rich tung strömende Treibmittelstrahl bleibt im Spaltraume 6 durch die Einwirkung des Überdruckkissens gut geschlossen und ge führt, wodurch die ,Streuungsverluste auf ein Minimum beschränkt werden. Die gleiche Einwirkung begünstigt auch den Treibmittel'strahl beim Verlassen der Laufradschaufeln 9 bezw. beim Durchströ men des Spaltraumes 7 bis zum Eintritt in die Leitschaufeln 10.
Bei dem Beispiel nach Fig. 3 sind die zum Festhalten der Bandage nötigen Nieten köpfe als Ventilationsschaufeln ä' und 4 aus gebildet.
An Stelle von zwei Schaufelreihen kann auch nur eine Schaufelreihe 11, wie in Fig. 4 angegeben ist, angeordnet werden, wobei der dadurch erzeugte Überdruck mindestens dem Druckabfall zwischen dem Leitradaus- tritt und dem Laufradaustritt entsprechen muB.
Device for reducing gap losses between turbine guide and impellers. In the case of the latest steam turbines, for example, the axial play between the guide and rotor rings is kept as small as possible in order to achieve low gap losses. Labyrinth-like seals are also arranged in order to limit these losses.
With regard to the thermal expansion of the rotor, this loss cross section cannot be completely eliminated and still forms a considerable percentage of the blade cross section.
According to the present invention, an overpressure cushion is generated on the outside of the impellers by a ventilation device and thus an elastic seal is created, which prevents the flow of propellant and thus eliminates the loss of gap between the guide and impellers.
Embodiments of the subject of the invention are shown schematically in the accompanying drawing. 1 is a longitudinal section through a guide and impeller blades; Figures 2, 3 and 4 are views of impeller bandages.
In the example of FIGS. 1 and 2, a.m impeller 1, which rotates in the direction of the arrow, or on the bandage 2 ventilation blades 3 and l are arranged, whose action diagram is opposite ent. When the impeller rotates, an over pressure cushion is created between the rows of blades 3 and 4 in the annular space 5, which prevents the leakage flow from the gap 6 to the gap 7.
The propellant jet flowing from the stator blades 8 to the impeller blades 9 in the axial direction remains well closed in the gap 6 by the action of the overpressure cushion and leads to ge, whereby the scattering losses are kept to a minimum. The same action also favors the propellant jet when it leaves the impeller blades 9 and 9 respectively. when flowing through the gap 7 up to the entry into the guide vanes 10.
In the example of FIG. 3, the rivet heads required to hold the bandage are formed as ventilation blades ä 'and 4 from.
Instead of two rows of blades, it is also possible to arrange only one row of blades 11, as indicated in FIG. 4, the overpressure generated thereby having to correspond at least to the pressure drop between the stator outlet and the impeller outlet.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE134451X | 1928-01-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH134451A true CH134451A (en) | 1929-07-31 |
Family
ID=5665501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH134451D CH134451A (en) | 1928-01-07 | 1928-12-14 | Device for reducing gap losses between turbine guide and impellers. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH134451A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3575523A (en) * | 1968-12-05 | 1971-04-20 | Us Navy | Labyrinth seal for axial flow fluid machines |
US4050845A (en) * | 1975-09-30 | 1977-09-27 | Kraftwerk Union Aktiengesellschaft | Device for stabilizing the position of rotors of large steam turbines |
US4274806A (en) * | 1979-06-18 | 1981-06-23 | General Electric Company | Staircase blade tip |
DE3505491A1 (en) * | 1985-02-16 | 1986-08-21 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | GASKET FOR A FLUID MACHINE |
US4682933A (en) * | 1984-10-17 | 1987-07-28 | Rockwell International Corporation | Labyrinthine turbine-rotor-blade tip seal |
EP1574671A2 (en) * | 2004-03-10 | 2005-09-14 | Siemens Westinghouse Power Corporation | Dynamic seal for a turbine engine |
EP1734292A1 (en) * | 2005-06-13 | 2006-12-20 | Siemens Aktiengesellschaft | Sealing means for a turbomachine |
-
1928
- 1928-12-14 CH CH134451D patent/CH134451A/en unknown
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3575523A (en) * | 1968-12-05 | 1971-04-20 | Us Navy | Labyrinth seal for axial flow fluid machines |
US4050845A (en) * | 1975-09-30 | 1977-09-27 | Kraftwerk Union Aktiengesellschaft | Device for stabilizing the position of rotors of large steam turbines |
US4274806A (en) * | 1979-06-18 | 1981-06-23 | General Electric Company | Staircase blade tip |
US4682933A (en) * | 1984-10-17 | 1987-07-28 | Rockwell International Corporation | Labyrinthine turbine-rotor-blade tip seal |
DE3505491A1 (en) * | 1985-02-16 | 1986-08-21 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | GASKET FOR A FLUID MACHINE |
US5088889A (en) * | 1985-02-16 | 1992-02-18 | Mtu Motoren-Und Turbinen-Union Muenchen Gmbh | Seal for a flow machine |
EP1574671A2 (en) * | 2004-03-10 | 2005-09-14 | Siemens Westinghouse Power Corporation | Dynamic seal for a turbine engine |
EP1574671A3 (en) * | 2004-03-10 | 2013-05-29 | Siemens Energy, Inc. | Dynamic seal for a turbine engine |
EP1734292A1 (en) * | 2005-06-13 | 2006-12-20 | Siemens Aktiengesellschaft | Sealing means for a turbomachine |
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