WO1997005364A1 - Structure de pale directrice et son utilisation dans une turbine a vapeur - Google Patents

Structure de pale directrice et son utilisation dans une turbine a vapeur Download PDF

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Publication number
WO1997005364A1
WO1997005364A1 PCT/DE1996/001303 DE9601303W WO9705364A1 WO 1997005364 A1 WO1997005364 A1 WO 1997005364A1 DE 9601303 W DE9601303 W DE 9601303W WO 9705364 A1 WO9705364 A1 WO 9705364A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide vane
cover
main axis
steam turbine
fastening element
Prior art date
Application number
PCT/DE1996/001303
Other languages
German (de)
English (en)
Inventor
Reinhard BÜRKNER
Torsten Ruhsland
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1997005364A1 publication Critical patent/WO1997005364A1/fr

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Classifications

    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/246—Fastening of diaphragms or stator-rings

Definitions

  • the invention relates to a guide vane structure, in particular for a steam turbine, with at least one supporting guide vane cover and a further guide vane cover.
  • the invention further relates to the use of such a guide vane structure in a steam turbine with a housing.
  • DE-PS 483 287 an upper load nozzle for steam turbines is described with a flow space for the overload steam with an almost constant gap width.
  • the flow space is produced by unscrewing the upper part of an intermediate floor.
  • the intermediate floor is spaced from the housing part in the flow space by using a spacer.
  • steam can be discharged from the housing of the steam turbine at one or more tapping points.
  • the housing has corresponding taps at predetermined positions.
  • the pressure of the extracted steam depends on which turbine stage, i.e. behind which the guide vane cover arranged in the direction of flow is tapped.
  • the tapping can take place behind a package of two to three guide vane covers.
  • the guide vane covers can be welded to one another or connected by means of radially extending pins.
  • the number and position of the guide vane covers which can be used in the steam turbine are predetermined by this type of fastening, so that a predetermined, unchangeable tapping also takes place.
  • DE 28 28 490 B2 describes a stator for a turbomachine in which a number of partitions with guide vanes are assembled to form a package that is mounted in the stator housing as a unit.
  • Each intermediate wall is surrounded by a ring, the corresponding depressions have, ⁇ o that adjacent rings interlock and have a direct mechanical contact.
  • the first ring in the flow direction is connected to the stator housing.
  • the further downstream rings are fastened by a bolt penetrating them between the first ring and a guide ring which does not enclose a partition and is fixed in the housing.
  • the turbomachine described has a single such package with an unchangeable axial distance between the intermediate walls.
  • the object of the invention is to provide a guide vane structure in which the number and position of the guide vane covers can also be changed retrospectively, so that a predeterminable discharge of fluid, in particular tapping, is ensured.
  • Another object of the invention is to specify a use of the guide vane structure in a steam turbine.
  • the task aimed at a guide vane structure for a steam turbine is achieved in that a group of
  • Guide vane covers which are largely rotationally symmetrical to a main axis and each have at least one screw opening parallel to the main axis, are provided, comprising at least one supporting guide vane cover for fixing the group in a housing, a turbine and at least one further guide vane cover.
  • this further guide vane cover is arranged at a corresponding distance in front of or behind the supporting guide vane cover and on this by at least one fastening element that extends essentially parallel to the main axis through the screw openings attached.
  • standardized guide vane covers with the fastening element can be attached to one another, in particular re to be attached to a package.
  • the number of guide vane lids is variable and can be, for example, two to five.
  • the further guide vane cover can be arranged in front of or behind the supporting guide vane cover and can be fastened to it when viewed in the direction of flow. When using several further guide vane covers, these can be arranged in almost any arrangement downstream and upstream of the supporting guide vane cover. This results in a variation of the pressure drop due to a changed arrangement of the further guide vane covers for a given position of a tapping nozzle in a steam turbine, even for a given position of the supporting guide vane cover.
  • a change in the tap pressure can be achieved by changing the arrangement of the guide vane covers without further measures.
  • a pressure drop in a gas turbine can be achieved through the guide vane structure.
  • such a guide vane structure can also be used to adjust the pressure drop when an overload is introduced to a corresponding overload steam introduction part.
  • a spacer ring is preferably arranged between two adjacent guide vane covers, as a result of which the axial distance of the guide vane covers from one another and thus a turbine stage is defined.
  • a corresponding pressure drop can be set individually and subsequently for each stage.
  • the spacer ring preferably also has at least one screw opening through which a respective fastening element can be guided, as a result of which the spacer ring can be positioned without further measures.
  • the spacer ring can also be arranged so that it is not penetrated by the fastening element.
  • Each fastening element is preferably detachable, as a result of which a modification of the guide vane structure can also be carried out in a simple manner afterwards. This is particularly advantageous if the pressure of the steam drawn off is to be changed without changing the position of the tapping points of a steam turbine.
  • the fastening element is preferably a screw.
  • This can be designed as an expansion bolt to compensate for temperature expansions and to minimize thermal stresses.
  • the screw opening of a guide vane cover can also be shaped such that it receives such an expansion bolt flush so that it is countersunk in the guide vane cover.
  • the screw opening is preferably a through hole with a round cross-section, although other cross-section shapes, such as rectangular, are of course also possible.
  • the fastening element can also be a metal rod, for example, which has bores for receiving pins, which detachably engage in the radial direction through a corresponding guide vane cover in the metal rod. This also achieves a releasable fastening of the guide vane covers by means of a fastening element.
  • the guide vane covers still remain undamaged and can again be combined by means of a new fastening element or new fastening elements to form the desired guide vane structure, which is thus retained in its original form.
  • the object aimed at using the guide vane structure is achieved in that the guide vane structure is used in a steam turbine to produce a predeterminable tap.
  • This is achieved in particular by making the guide vane covers the same and largely standardized within a step group, so that they can be manufactured independently of a specific tapping and position of the tapping nozzles.
  • the further guide vane covers can be arranged accordingly for a specific tap. If it is necessary to change the tapping pressure of a predetermined tapping nozzle, the guide vane structure can be reassembled or implemented in order to set the desired tapping pressure. This can be carried out with little effort without completely redesigning the guide vane structure, ie the step group.
  • the steam turbine has a housing which is directed along a main axis.
  • the guide vane structure is fixed in the housing via the supporting guide vane cover.
  • the supporting guide vane cover preferably extends radially outward further than the further or the further guide vane cover and protrudes into a groove of the housing forming a sealing surface.
  • the variability of the guide vane structure is achieved in that the further guide vane cover or the further guide vane covers can be arranged in almost any combination ⁇ downstream or ⁇ flow on the carrying guide vane cover.
  • the tapping pressure can be variably adjusted by regrouping the existing guide vane covers or by increasing or removing one or more guide vane covers downstream and upstream of the supporting guide vane cover.
  • the guide vane structure is explained in more detail with the aid of the figure.
  • the single figure shows a longitudinal section of a guide vane structure in a steam turbine (not shown in detail).
  • the illustrated guide vane structure 1 is largely symmetrical to the main axis 4, along which the housing 11 of the steam turbine is directed.
  • the guide vane structure 1 has a supporting guide vane cover 2, to which a further guide vane cover 3 is attached in each case upstream and downstream.
  • a plurality of screw openings 5 and 6, which run parallel to the main axis 4 and which are designed as through bores, in the supporting guide vane cover 2 and the further guide vane covers 3.
  • a spacer ring 7 is arranged in each case between the supporting guide vane cover 2 and the further guide vane covers 3.
  • This spacer ring 7 also has penetrating screw openings 8 running parallel to the main axis 4.
  • a fastening means 9, a screw 9a is guided through all the screw openings 5, 6 and 8 lying in a line parallel to the main axis 4.
  • This screw 9a is designed as an expansion bolt, at the ends of which a screw nut 16 is tightened with a securing element (not shown further).
  • the load-bearing guide vane cover 2 is directed further radially outward than the other guide vane covers 3 and bears against a sealing surface 10 of the housing 11. As a result, in addition to an axial fixation of the supporting guide vane cover 2, a leakage flow between the housing 11 and the guide vane structure 1 is prevented in the axial direction.
  • Each guide vane cover 2, 3 has guide vanes 12 running from the outer circumference to the main axis 4.
  • the arrow 15 indicates the direction of flow of the steam of the steam turbine as it enters between the guide vanes 12. Downstream of the guide vane structure 1 there is a tapping nozzle (not shown) for tapping steam.
  • each fastening element 9 there is a releasable fastening and arrangement of the further guide vane covers 3 with the supporting guide vane cover 2.
  • a change in the guide vane structure 1 can also be achieved subsequently by simply loosening the fastening elements 9. It is also easily possible to add a further guide vane cover 3 or to remove a further guide vane cover 3. by using a fastening means 9 correspondingly changed in length.
  • the invention is characterized by a guide vane structure in which standardized guide vane covers are attached to a supporting guide vane cover which is also standardized by interposing spacer rings of different thicknesses.
  • the fastening is preferably carried out via at least one fastening element which is guided through screw holes in the guide vane covers and the spacer rings through all spacer rings and guide vane covers and thus connects them to form a unit.
  • the variably adaptable guide vane structure can be used to implement a desired tapping pressure in which the number and the position of the further guide vane covers and the distance from one another are selected accordingly.
  • the supporting guide vane cover not only fixes the further guide vane covers and fixes them in the housing of the steam turbine, but also seals them against the housing of the steam turbine. It is also possible to produce guide vane structures of this type with different diameters, each with standardized guide vane covers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne une structure de pale directrice (1) pour une turbine à vapeur, qui comprend au moins un couvercle (1) porteur de pale directrice et un autre couvercle (3) de la pale directrice qui sont tous les deux symétriques par rapport à un axe principal (4) et pourvus chacun d'au moins une ouverture filetée (5, 6) sensiblement parallèle à l'axe principal. Un élément de fixation (9) sensiblement parallèle à l'axe principal (4), notamment une vis (9a), est inséré dans ces ouvertures filetées (5, 6) afin de relier mutuellement les couvercles (2, 3) de la pale directrice. L'élément de fixation (9) est de préférence amovible, ce qui permet de réaliser librement la structure de la pale directrice (1) et de régler pratiquement librement la différence de pression dans la turbine à vapeur.
PCT/DE1996/001303 1995-07-28 1996-07-17 Structure de pale directrice et son utilisation dans une turbine a vapeur WO1997005364A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19527662.0 1995-07-28
DE1995127662 DE19527662C1 (de) 1995-07-28 1995-07-28 Leitschaufelstruktur für eine Dampfturbine sowie Verwendung der Leitschaufelstruktur

Publications (1)

Publication Number Publication Date
WO1997005364A1 true WO1997005364A1 (fr) 1997-02-13

Family

ID=7768052

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/001303 WO1997005364A1 (fr) 1995-07-28 1996-07-17 Structure de pale directrice et son utilisation dans une turbine a vapeur

Country Status (2)

Country Link
DE (1) DE19527662C1 (fr)
WO (1) WO1997005364A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19708273C1 (de) * 1997-02-28 1998-04-30 Siemens Ag Turbinengehäuse
JPH11343807A (ja) * 1998-06-01 1999-12-14 Mitsubishi Heavy Ind Ltd 蒸気タービンの連結静翼
US7270512B2 (en) * 2005-08-24 2007-09-18 General Electric Company Stacked steampath and grooved bucket wheels for steam turbines

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB208681A (en) * 1923-02-23 1923-12-27 Erste Bruenner Maschinen Fab Improvements in and relating to steam or gas turbines, turbocompressors and the like
CH105313A (de) * 1923-01-25 1924-06-16 Erste Bruenner Maschinen Fab Befestigungseinrichtung für die Leitscheiben von Dampfturbinen, Gasturbinen, Turbokompressoren und dergleichen.
DE483287C (de) * 1929-10-01 Aeg UEberlastduese fuer Dampfturbinen
FR2288214A1 (fr) * 1974-10-14 1976-05-14 Creusot Loire Perfectionnements aux stators de turbomachines permettant de simplifier le montage et la fabrication de l'ensemble
DE2828490A1 (de) * 1977-07-12 1979-01-25 Stal Laval Turbin Ab Turbomaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE483287C (de) * 1929-10-01 Aeg UEberlastduese fuer Dampfturbinen
CH105313A (de) * 1923-01-25 1924-06-16 Erste Bruenner Maschinen Fab Befestigungseinrichtung für die Leitscheiben von Dampfturbinen, Gasturbinen, Turbokompressoren und dergleichen.
GB208681A (en) * 1923-02-23 1923-12-27 Erste Bruenner Maschinen Fab Improvements in and relating to steam or gas turbines, turbocompressors and the like
FR2288214A1 (fr) * 1974-10-14 1976-05-14 Creusot Loire Perfectionnements aux stators de turbomachines permettant de simplifier le montage et la fabrication de l'ensemble
DE2828490A1 (de) * 1977-07-12 1979-01-25 Stal Laval Turbin Ab Turbomaschine

Also Published As

Publication number Publication date
DE19527662C1 (de) 1997-01-16

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