EP1046788A1 - Nozzle - Google Patents

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Publication number
EP1046788A1
EP1046788A1 EP99810328A EP99810328A EP1046788A1 EP 1046788 A1 EP1046788 A1 EP 1046788A1 EP 99810328 A EP99810328 A EP 99810328A EP 99810328 A EP99810328 A EP 99810328A EP 1046788 A1 EP1046788 A1 EP 1046788A1
Authority
EP
European Patent Office
Prior art keywords
diffuser
housing
sealing
sealing ring
ferritic
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP99810328A
Other languages
German (de)
French (fr)
Other versions
EP1046788B1 (en
Inventor
Roger Hochstrasser
Stephan Konezciny
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
Original Assignee
Asea Brown Boveri AG
ABB Asea Brown Boveri Ltd
Asea Brown Boveri AB
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 Asea Brown Boveri AG, ABB Asea Brown Boveri Ltd, Asea Brown Boveri AB filed Critical Asea Brown Boveri AG
Priority to EP19990810328 priority Critical patent/EP1046788B1/en
Priority to DE59910136T priority patent/DE59910136D1/en
Publication of EP1046788A1 publication Critical patent/EP1046788A1/en
Application granted granted Critical
Publication of EP1046788B1 publication Critical patent/EP1046788B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/047—Nozzle boxes
    • 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 is a diffuser such as that in a Steam power plant is used.
  • diffusers for Inflow of steam can be used in a turbine of a steam power plant, to fix in a diffuser housing. It is possible to make the diffuser out of one ferritic or ferritic-martensitic material on the diffuser housing with Fasten screws. However, this has the disadvantage that these screws from must be accessible from the outside, which results in an enlargement of the housing Has. It is also known to thread the diffuser on the diffusion housing screw tight. However, this has the disadvantage that the diffuser can be removed from the Diffuser housing after a long commissioning of the diffuser by the The effect of temperature is no longer possible. They are also diffusers from one austenitic material known, which shrinks in the diffuser housing become. However, these are relatively expensive due to the austenitic material. In addition the diffusers can no longer be detached from the diffuser housing.
  • the aim of the invention is to overcome these disadvantages.
  • the invention solves the problem of fastening a diffuser in a diffuser housing in such a way that it can be easily removed from the housing even after it has been put into operation for a long time and after exposure to high temperatures.
  • the use of expensive austenistic diffusers should also be avoided.
  • the object is achieved in a diffuser according to the preamble of claim 1 in that at least one sealing or tensioning element is arranged around the diffuser, between the diffuser and the diffuser housing, which element is made of a material with a greater coefficient of thermal expansion than the material of the diffuser consists.
  • the tensioning element between the diffuser and the diffuser housing advantageously expands more than the surrounding material due to the action of temperature, whereby it shrinks itself and the diffuser in the diffuser housing is held securely.
  • the diffuser can therefore be installed in the diffuser housing with a certain amount of play and is given a secure hold during operation due to the temperature change.
  • the sealing or tensioning element is mounted on a centering seat and additionally ensures that the diffuser is centered.
  • FIG. 1 shows a longitudinal section through an embodiment of a diffuser 1 according to the invention.
  • a diffuser 1 is used, for example, in a steam power plant for the inflow of steam into a turbine.
  • the diffuser 1 according to the invention is installed in a diffuser housing 4.
  • Both the diffuser 1 and the diffuser housing 4 are either made of a ferritic or a ferritic / martensitic material.
  • a ferritic material can be G17CrMoV5-10 (according to DIN: material no. 1.7706). The thermal expansion coefficient of such a ferritic material is approx.
  • a sealing element 2 is arranged between the diffuser 1 and the diffuser housing 4, which is a sealing ring 2 in the exemplary embodiment shown.
  • Two half-shells 3 are arranged on each side in front of and behind the sealing ring 2. For better illustration, these sealing or bracing elements 2, 3 are drawn out explosively in FIG. 1.
  • the half-shells 3 and the sealing ring 2 are made of a material with a greater coefficient of thermal expansion than the diffuser 1 and the diffuser housing 4. They are preferably made of an austenitic material. X8CrNiMoVNb16 13 (DIN material no. 1.4988) is conceivable for this. The thermal expansion coefficient at 500 ° C is: 18.3x10 -6 [1 / K].
  • FIG. 2 shows a cross section through an embodiment of a Diffuser 1 according to the invention in accordance with the section II-II in FIG. 1 are the two in Figure 2 between the diffuser 1 and the diffuser housing 4 front half-shells 3 visible. Is between the two half-shells 3 at each end a small gap, in which the one behind in Figure 2 Sealing ring 2 is visible.
  • the half-shells 3 are made of a material a larger coefficient of thermal expansion than the diffuser 1 and they stretch this is more pronounced when the diffuser is in operation. This effect is with a Effective temperature above approx. 450 ° C.
  • the mentioned gap ensures that the thermal expansion of the half-shells 3 is not only radial Direction takes place, but also in the direction of this gap.
  • the diffuser 1 in the cold state insert certain play into the diffuser housing 4.
  • Half shells 3 firmly on the housing and ensure a secure hold of the diffuser 1.
  • the sealing ring 2 is provided to prevent leakage minimized by the gap mentioned.
  • Execute half shells in a C-shape This only creates a gap between the two ends of the Cs. Because the thermal expansion of the Sealing ring 2 and the half-shells 3 are reversible, it is advantageously possible the diffuser 1 in the cooled state simply from the diffuser housing 4 expand.
  • FIG. 3 shows a second embodiment of a diffuser 1 according to the invention shown.
  • the diffuser 1 according to the invention is again in a diffuser housing 4 built-in.
  • Diffuser 1 or diffuser housing 4 are the same as that in FIG. 1 specified embodiment from a ferritic or ferritic-martensitic Material.
  • the sealing ring 2 is open a centering seat 5 arranged at one end of the diffuser 1.
  • the sealing ring 2 again consists of a material with a higher thermal Expansion coefficient in comparison with the material of the diffuser 1 and the Diffuser housing 4, preferably it is made of an austenitic material. He is designed according to the shape of the centering seat 5 with two bevels.
  • the sealing ring 2 is as in the first embodiment with a certain amount of play arranged around the diffuser 1. Since the sealing ring 2 expands more than that He acts material of the diffuser 1 or the diffuser housing 4 in this Embodiment not only tense, so ensures a secure fit of the Diffuser 1 in the diffuser housing 4 due to the greater thermal expansion Temperature increase through the operation, and at the same time sealing, but he fixes the diffuser 1 through the centering seat 5 also in a horizontal position. Lowers itself the temperature after shutting down the system again, it is easily possible remove the diffuser 1 since the thermal expansions recede and it is installed with a game in the diffuser housing 4.
  • the sealing ring 2 is attached to one end of the diffuser 1, it is additionally by a Retaining ring 6 held.
  • This retaining ring 6 contains a bevel of the centering seat 5.
  • the retaining ring 6 is attached to the end of the diffuser 1. It is possible that he is at it screwed or shrunk on.
  • the sealing ring 2 consists of several parts. It is conceivable, as in the embodiment shown in FIG. 1, of two Parts (i.e. two half shells). But there are also three or more parts possible. In this case it is not necessary to manufacture the retaining ring as an extra part, but it can be integrated into the diffuser 1 because the different parts of the Sealing ring 2 can be placed from the outside.
  • FIG. 4 shows section IV-IV of FIG. 3.
  • the Sealing ring 2 in this embodiment in one piece around the diffuser 1 between Diffuser 1 and diffuser housing 4 arranged. But also a segmentation of the Sealing ring 2 in several parts is conceivable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The diffuser (1) is within a diffuser housing (4) such as for the steam flow to a turbine in a power station. The diffuser ( and housing (4) are of a ferrite or ferrite-martensite material. A sealing or clamping unit (2) is between the diffuser (1) and housing (4), of a material with a higher coefficient of expansion than the material of the diffuser (1) and housing (4). When th assembly is cold, the seal can be inserted into the gap between the diffuser and housing and, as it heats up the seal expands mo than the surrounding material for an effective seal against leakage. A centering seat (5) ensures that the assembly is fixed horizontally.

Description

TECHNISCHES GEBIETTECHNICAL AREA

Bei der Erfindung handelt es sich um einen Diffusor wie er beispielsweise in einem Dampfkraftwerk eingesetzt wird.The invention is a diffuser such as that in a Steam power plant is used.

STAND DER TECHNIKSTATE OF THE ART

Es sind verschiedene Möglichkeiten bekannt, Diffusoren, wie sie beispielsweise zur Einströmung von Dampf in eine Turbine eines Dampfkraftwerks eingesetzt werden, in einem Diffusorgehäuse zu befestigen. Es ist möglich, den Diffusor aus einem ferritischen bzw. ferritisch-martensitischen Material an dem Diffusorgehäuse mit Schrauben zu befestigen. Dies hat aber den Nachteil, dass diese Schrauben von aussen zugänglich sein müssen, was eine Vergrösserung des Gehäuses zur Folge hat. Es ist auch bekannt, den Diffusor mit einem Gewinde am Diffusionsgehäuse festzuschrauben. Das hat aber den Nachteil, dass ein Ausbau des Diffusors aus dem Diffusorgehäuse nach einer längeren Inbetriebnahme des Diffusors durch die Temperatureinwirkung nicht mehr möglich ist. Es sind auch Diffusoren aus einem austenitischen Material bekannt, welche in dem Diffusorgehäuse eingeschrumpft werden. Diese werden aber durch das austenitisches Material relativ teuer. Zudem sind die Diffusoren vom Diffusorgehäuse nicht mehr lösbar.Various options are known, such as diffusers for Inflow of steam can be used in a turbine of a steam power plant, to fix in a diffuser housing. It is possible to make the diffuser out of one ferritic or ferritic-martensitic material on the diffuser housing with Fasten screws. However, this has the disadvantage that these screws from must be accessible from the outside, which results in an enlargement of the housing Has. It is also known to thread the diffuser on the diffusion housing screw tight. However, this has the disadvantage that the diffuser can be removed from the Diffuser housing after a long commissioning of the diffuser by the The effect of temperature is no longer possible. They are also diffusers from one austenitic material known, which shrinks in the diffuser housing become. However, these are relatively expensive due to the austenitic material. In addition the diffusers can no longer be detached from the diffuser housing.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Das Ziel der Erfindung ist es, diese Nachteile zu überwinden. Die Erfindung löst die Aufgabe, einen Diffusor in einem Diffusorgehäuse so zu befestigen, dass er auch nach längerer Inbetriebnahme und grösserer Temperatureinwirkung leicht wieder aus dem Gehäuse ausbaubar ist. Ebenfalls soll der Einsatz von teuren austenistischen Diffusoren vermieden werden.
Erfindungsgemäss wird die Aufgabe bei einem Diffusor gemäss dem Oberbegriff des Patentanspruchs 1 dadurch gelöst, dass um den Diffusor, zwischen Diffusor und dem Diffusorgehäuse, mindestens ein dichtendes bzw. verspannendes Element angeordnet ist, welches aus einem Material mit einem grösserem Wärmeausdehnungskoeffizienten als das Material des Diffusors besteht.
Vorteilhaft dehnt sich das verspannende Element zwischen dem Diffusor und dem Diffusorgehäuse bei Betrieb des Diffusors durch die Temperatureinwirkung stärker als das umgebende Material aus, wobei es sich dabei selbst einschrumpft und dem Diffusor in dem Diffusorgehäuse einen sicheren Halt gibt. Der Diffusor kann also mit einem gewissen Spiel in das Diffusorgehäuse eingebaut werden und bekommt seinen sicheren Halt während des Betriebes durch die Temperaturänderung. Im erkalteten Zustand ist es einfach möglich, den Diffusor aus dem Diffusorgehäuse wieder auszubauen. In einer besonders vorteilhaften Ausführungsform ist das dichtende bzw. verspannende Element auf einem Zentriersitz gelagert und sorgt zusätzlich für eine Zentrierung des Diffusors.The aim of the invention is to overcome these disadvantages. The invention solves the problem of fastening a diffuser in a diffuser housing in such a way that it can be easily removed from the housing even after it has been put into operation for a long time and after exposure to high temperatures. The use of expensive austenistic diffusers should also be avoided.
According to the invention, the object is achieved in a diffuser according to the preamble of claim 1 in that at least one sealing or tensioning element is arranged around the diffuser, between the diffuser and the diffuser housing, which element is made of a material with a greater coefficient of thermal expansion than the material of the diffuser consists.
When the diffuser is in operation, the tensioning element between the diffuser and the diffuser housing advantageously expands more than the surrounding material due to the action of temperature, whereby it shrinks itself and the diffuser in the diffuser housing is held securely. The diffuser can therefore be installed in the diffuser housing with a certain amount of play and is given a secure hold during operation due to the temperature change. When cooled, it is easy to remove the diffuser from the diffuser housing. In a particularly advantageous embodiment, the sealing or tensioning element is mounted on a centering seat and additionally ensures that the diffuser is centered.

KURZE BESCHREIBUNG DER ZEICHNUNGENBRIEF DESCRIPTION OF THE DRAWINGS

Es zeigen:

Fig.1
einen Längsschnitt durch eine Ausführungsform eines erfindungsgemässen Diffusors und
Fig.2
einen Querschnitt (entsprechend der Linie II-II in der Figur 1) durch eine Ausführungsform eines erfindungsgemässen Diffusors.
Fig.3
einen Längsschnitt durch eine zweite Ausführungsform eines erfindungsgemässen Diffusors und
Fig.4
einen Querschnitt (entsprechend der Linie IV-IV in der Figur 3) durch die zweite Ausführungsform eines erfindungsgemässen Diffusors.
Show it:
Fig. 1
a longitudinal section through an embodiment of a diffuser according to the invention and
Fig. 2
a cross section (corresponding to line II-II in Figure 1) through an embodiment of a diffuser according to the invention.
Fig. 3
a longitudinal section through a second embodiment of a diffuser according to the invention and
Fig. 4
a cross section (corresponding to the line IV-IV in Figure 3) through the second embodiment of a diffuser according to the invention.

Es sind nur die für die Erfindung wesentlichen Elemente dargestellt. Gleiche Elemente werden in unterschiedlichen Figuren gleich bezeichnet. Only the elements essential to the invention are shown. Same Elements are given the same names in different figures.

WEG ZUR AUSFÜHRUNG DER ERFINDUNGWAY OF CARRYING OUT THE INVENTION

Die Figur 1 zeigt einen Längsschnitt durch eine Ausführungsform eines erfindungsgemässen Diffusors 1. Ein solcher Diffusor 1 wird beispielsweise in einem Dampfkraftwerk zur Einströmung von Dampf in eine Turbine eingesetzt. Der erfindungsgemässe Diffusor 1 ist in einem Diffusorgehäuse 4 eingebaut. Sowohl der Diffusor 1 als auch das Diffusorgehäuse 4 sind entweder aus einem ferritischen oder einem ferritischen/martensitischen Material. Ein solches Material kann bis zu einer Temperatur von ca. 600°C des durchströmenden Mediums eingesetzt werden. Beispielsweise kann es sich bei einem ferritischen Material um G17CrMoV5-10 (nach DIN: Werkstoffnr. 1.7706) handeln. Der thermische Ausdehnungskoeffizient von einem solchen ferritischen Material ist ca. 13.5 x 10-6 [1/K] (Wert bei 500°C). Bei einem ferritisch-martensitischen Materialien ist z.B. G-X22CrMoV12 1 (nach DIN: Werkstoffnr. 1.4931) denkbar. Der thermische Ausdehnungskoeffizient von einem solchen ferritisch-martensitischen Material ist ca. 11.5 x 10-6 [1/K] bei 500°C. Zwischen dem Diffusor 1 und dem Diffusorgehäuse 4 ist erfindungsgemäss ein dichtendes Element 2 angeordnet, welches in dem dargestellten Ausführungsbeispiel ein Dichtungsring 2 ist. Vor und hinter dem Dichtungsring 2 sind auf jeder Seite zwei Halbschalen 3 angeordnet. Zur besseren Darstellung sind diese dichtende bzw. verspannende Elemente 2,3 in der Figur 1 explosionsartig herausgezeichnet. Die Halbschalen 3 und der Dichtungsring 2 sind aus einem Material mit einem grössen Wärmeausdehnungskoeffizienten als der Diffusor 1 und das Diffusorgehäuse 4. Vorzugsweise bestehen sie aus einem austenitischen Material. Denkbar dafür ist z.B. X8CrNiMoVNb16 13 (DIN-Werkstoffnr. 1.4988). Der thermische Ausdehnungskoeffizient ist bei 500°C: 18.3x10-6 [1/K].FIG. 1 shows a longitudinal section through an embodiment of a diffuser 1 according to the invention. Such a diffuser 1 is used, for example, in a steam power plant for the inflow of steam into a turbine. The diffuser 1 according to the invention is installed in a diffuser housing 4. Both the diffuser 1 and the diffuser housing 4 are either made of a ferritic or a ferritic / martensitic material. Such a material can be used up to a temperature of approx. 600 ° C of the medium flowing through. For example, a ferritic material can be G17CrMoV5-10 (according to DIN: material no. 1.7706). The thermal expansion coefficient of such a ferritic material is approx. 13.5 x 10 -6 [1 / K] (value at 500 ° C). For a ferritic-martensitic material, for example, G-X22CrMoV12 1 (according to DIN: material number 1.4931) is conceivable. The thermal expansion coefficient of such a ferritic-martensitic material is approximately 11.5 x 10 -6 [1 / K] at 500 ° C. According to the invention, a sealing element 2 is arranged between the diffuser 1 and the diffuser housing 4, which is a sealing ring 2 in the exemplary embodiment shown. Two half-shells 3 are arranged on each side in front of and behind the sealing ring 2. For better illustration, these sealing or bracing elements 2, 3 are drawn out explosively in FIG. 1. The half-shells 3 and the sealing ring 2 are made of a material with a greater coefficient of thermal expansion than the diffuser 1 and the diffuser housing 4. They are preferably made of an austenitic material. X8CrNiMoVNb16 13 (DIN material no. 1.4988) is conceivable for this. The thermal expansion coefficient at 500 ° C is: 18.3x10 -6 [1 / K].

Die Figur 2 zeigt einen Querschnitt durch eine Ausführungsform eines erfindungsgemässen Diffusors 1 entsprechend dem Schnitt II-II in der Figur 1. Es sind in der Figur 2 zwischen dem Diffusor 1 und dem Diffusorgehäuse 4 die beiden vorderen Halbschalen 3 sichtbar. Zwischen den beiden Halbschalen 3 befindet sich an jedem Ende ein kleiner Spalt, in welchem in der Figur 2 der dahinter liegende Dichtungsring 2 sichtbar wird. Die Halbschalen 3 bestehen aus einem Material mit einem grösseren Wärmeausdehnungskoeffizient als der Diffusor 1 und sie dehnen sich dadurch bei Betrieb des Diffusors stärker aus. Dieser Effekt wird bei einer Temperatur oberhalb von ca. 450°C effektiv wirksam. Der erwähnte Spalt sorgt dafür, dass sich die thermische Ausdehnung der Halbschalen 3 nicht nur in radialer Richtung stattfindet, sondern auch in Richtung dieses Spaltes. Durch diese Anordnung ist es vorteilhaft möglich, den Diffusor 1 im kalten Zustand mit einem gewissen Spiel in das Diffusorgehäuse 4 einzusetzen. Durch die verstärkte thermische Ausdehnung während des Betriebs des Diffusors 1 schrumpfen sich die Halbschalen 3 am Gehäuse fest und sorgen für einem sicheren Halt des Diffusors 1. Zu einem gewissen Mass dichten sie auch den Spalt zwischen dem Diffusor 1 und dem Diffusorgehäuse 4 ab. Der Dichtungsring 2 ist vorgesehen, um die Leckage, die durch den erwähnten Spalt entsteht, zu minimieren. Es ist auch denkbar, die Halbschalen in einer C-Form auszuführen. Dadurch entsteht lediglich ein Spalt zwischen den beiden Enden des Cs. Da die thermische Ausdehnung des Dichtungsringes 2 und der Halbschalen 3 reversibel sind, ist es vorteilhaft möglich, den Diffusor 1 im erkalteten Zustand einfach aus dem Diffusorgehäuse 4 auszubauen.FIG. 2 shows a cross section through an embodiment of a Diffuser 1 according to the invention in accordance with the section II-II in FIG. 1 are the two in Figure 2 between the diffuser 1 and the diffuser housing 4 front half-shells 3 visible. Is between the two half-shells 3 at each end a small gap, in which the one behind in Figure 2 Sealing ring 2 is visible. The half-shells 3 are made of a material a larger coefficient of thermal expansion than the diffuser 1 and they stretch this is more pronounced when the diffuser is in operation. This effect is with a Effective temperature above approx. 450 ° C. The mentioned gap ensures that the thermal expansion of the half-shells 3 is not only radial Direction takes place, but also in the direction of this gap. Through this Arrangement, it is advantageously possible to use the diffuser 1 in the cold state insert certain play into the diffuser housing 4. Through the reinforced thermal expansion during operation of the diffuser 1 shrink Half shells 3 firmly on the housing and ensure a secure hold of the diffuser 1. To a certain extent, they also seal the gap between the diffuser 1 and the diffuser housing 4. The sealing ring 2 is provided to prevent leakage minimized by the gap mentioned. It is also conceivable that Execute half shells in a C-shape. This only creates a gap between the two ends of the Cs. Because the thermal expansion of the Sealing ring 2 and the half-shells 3 are reversible, it is advantageously possible the diffuser 1 in the cooled state simply from the diffuser housing 4 expand.

In der Figur 3 ist eine zweite Ausführungsform eines erfindungsgemässen Diffusors 1 dargestellt. Der erfindungsgemässe Diffusor 1 ist wieder in ein Diffusorgehäuse 4 eingebaut. Diffusor 1 bzw. Diffusorgehäuse 4 sind wie in dem in der Figur 1 angegebenen Ausführungsbeispiel aus einem ferritischen bzw. ferritisch-martensitischen Material. In dieser Ausführungsform ist der Dichtungsring 2 auf einem Zentriersitz 5 an einem Ende des Diffusors 1 angeordnet. Der Dichtungsring 2 besteht wieder aus einem Material mit einem höheren thermischen Ausdehnungskoeffizienten im Vergleich mit dem Material des Diffusors 1 bzw. des Diffusorgehäuses 4, vorzugsweise besteht er aus einem austenitischen Material. Er ist entsprechend der Form des Zentriersitzes 5 mit zwei Abschrägungen ausgebildet. Der Dichtungsring 2 ist wie im ersten Ausführungsbeispiel mit einem gewissen Spiel um den Diffusor 1 angeordnet. Da sich der Dichtungsring 2 stärker ausdehnt als das Material des Diffusors 1 bzw. des Diffusorgehäuses 4 wirkt er in diesem Ausführungsbeispiel nicht nur verspannend, sorgt also für einen sicheren Sitz des Diffusors 1 im Diffusorgehäuse 4 bedingt durch die grössere Wärmeausdehnung bei Temperaturerhöhung durch den Betrieb, und gleichzeitig auch dichtend, sondern er fixiert den Diffusor 1 durch den Zentriersitz 5 auch in horizontaler Lage. Senkt sich die Temperatur nach einem Herabfahren der Anlage wieder, ist es einfach möglich, den Diffusor 1 auszubauen, da sich die thermischen Ausdehnungen zurückbilden und er mit einem Spiel in das Diffusorgehäuse 4 eingebaut ist. Da der Dichtungsring 2 an einem Ende des Diffusors 1 angebracht ist, wird er zusätzlich durch einen Haltering 6 gehalten. Dieser Haltering 6 enthält eine Abschrägung des Zentriersitzes 5. Der Haltering 6 ist am Ende des Diffusors 1 befestigt. Möglich ist, dass er daran geschraubt oder aufgeschrumpft ist. In einer weiteren Ausführungsform, welche nicht in einer Figur dargestellt ist, besteht der Dichtungsring 2 aus mehreren Teilen. Denkbar ist, ihn wie in dem in der Figur 1 dargestellten Ausführungsbeispiel aus zwei Teilen (also zwei Halbschalen) auszuführen. Aber auch drei oder mehr Teile sind möglich. In diesem Fall ist es nicht notwendig, den Haltering als Extrateil zu fertigen, sondern er kann in den Diffusor 1 integriert werden, da die verschiedenen Teile des Dichtungsrings 2 von aussen aufgesetzt werden können.FIG. 3 shows a second embodiment of a diffuser 1 according to the invention shown. The diffuser 1 according to the invention is again in a diffuser housing 4 built-in. Diffuser 1 or diffuser housing 4 are the same as that in FIG. 1 specified embodiment from a ferritic or ferritic-martensitic Material. In this embodiment, the sealing ring 2 is open a centering seat 5 arranged at one end of the diffuser 1. The sealing ring 2 again consists of a material with a higher thermal Expansion coefficient in comparison with the material of the diffuser 1 and the Diffuser housing 4, preferably it is made of an austenitic material. He is designed according to the shape of the centering seat 5 with two bevels. The sealing ring 2 is as in the first embodiment with a certain amount of play arranged around the diffuser 1. Since the sealing ring 2 expands more than that He acts material of the diffuser 1 or the diffuser housing 4 in this Embodiment not only tense, so ensures a secure fit of the Diffuser 1 in the diffuser housing 4 due to the greater thermal expansion Temperature increase through the operation, and at the same time sealing, but he fixes the diffuser 1 through the centering seat 5 also in a horizontal position. Lowers itself the temperature after shutting down the system again, it is easily possible remove the diffuser 1 since the thermal expansions recede and it is installed with a game in the diffuser housing 4. Because the sealing ring 2 is attached to one end of the diffuser 1, it is additionally by a Retaining ring 6 held. This retaining ring 6 contains a bevel of the centering seat 5. The retaining ring 6 is attached to the end of the diffuser 1. It is possible that he is at it screwed or shrunk on. In another embodiment, which is not is shown in a figure, the sealing ring 2 consists of several parts. It is conceivable, as in the embodiment shown in FIG. 1, of two Parts (i.e. two half shells). But there are also three or more parts possible. In this case it is not necessary to manufacture the retaining ring as an extra part, but it can be integrated into the diffuser 1 because the different parts of the Sealing ring 2 can be placed from the outside.

In der Figur 4 ist der Schnitt IV-IV der Figur 3 angegeben. Wie dargestellt, ist der Dichtungsring 2 in diesem Ausführungsbeispiel einteilig um dem Diffusor 1 zwischen Diffusor 1 und Diffusorgehäuse 4 angeordnet. Aber auch eine Segmentierung des Dichtungsrings 2 in mehrere Teile ist denkbar.FIG. 4 shows section IV-IV of FIG. 3. As shown, the Sealing ring 2 in this embodiment in one piece around the diffuser 1 between Diffuser 1 and diffuser housing 4 arranged. But also a segmentation of the Sealing ring 2 in several parts is conceivable.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
DiffusorDiffuser
22nd
Dichtungsring, dichtendes ElementSealing ring, sealing element
33rd
Halbschalen, verspannendes ElementHalf-shells, bracing element
44th
DiffusorgehäuseDiffuser housing
55
ZentriersitzCentering seat
66
HalteringRetaining ring

Claims (3)

Diffusor (1) in einem Diffusorgehäuse (4), beides aus einem ferritischen oder ferritisch-martensitischen Material,
dadurch gekennzeichnet, dass
um den Diffusor (1), zwischen Diffusor (1) und dem Diffusorgehäuse (4), mindestens ein dichtendes bzw. verspannendes Element (2,3) angeordnet ist, welches aus einem Material mit einem grösserem Wärmeausdehnungskoeffizienten als das Material des Diffusors (1) besteht.Diffuser (1) in a diffuser housing (4), both made of a ferritic or ferritic-martensitic material,
characterized in that
around the diffuser (1), between the diffuser (1) and the diffuser housing (4), at least one sealing or bracing element (2, 3) is arranged, which is made of a material with a greater coefficient of thermal expansion than the material of the diffuser (1) consists. Diffusor (1) nach Anspruch 1,
dadurch gekennzeichnet, dass
das mindestens eine dichtende bzw. verspannende Element (2,3) aus einem austenitischen Material besteht.Diffuser (1) according to claim 1,
characterized in that
the at least one sealing or bracing element (2, 3) consists of an austenitic material. Diffusor (1) nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, dass
das mindestens eine dichtende bzw. verspannende Element (2,3) auf einem Zentriersitz (5) um den Diffusor (1) angeordnet ist.Diffuser (1) according to one of claims 1 or 2,
characterized in that
the at least one sealing or bracing element (2, 3) is arranged on a centering seat (5) around the diffuser (1).
EP19990810328 1999-04-21 1999-04-21 Nozzle Expired - Lifetime EP1046788B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19990810328 EP1046788B1 (en) 1999-04-21 1999-04-21 Nozzle
DE59910136T DE59910136D1 (en) 1999-04-21 1999-04-21 diffuser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19990810328 EP1046788B1 (en) 1999-04-21 1999-04-21 Nozzle

Publications (2)

Publication Number Publication Date
EP1046788A1 true EP1046788A1 (en) 2000-10-25
EP1046788B1 EP1046788B1 (en) 2004-08-04

Family

ID=8242779

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10310678B3 (en) * 2003-03-12 2004-09-23 Atlas Copco Energas Gmbh Expansion turbine stage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9206705B2 (en) * 2012-03-07 2015-12-08 Mitsubishi Hitachi Power Systems, Ltd. Sealing device and gas turbine having the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642025A (en) * 1983-06-09 1987-02-10 Bbc Brown, Boveri & Company, Limited Valve for steam supply on double casing turbines
US5037269A (en) * 1990-01-26 1991-08-06 Westinghouse Electric Corp. Self-locking nozzle blocks for steam turbines
US5628617A (en) * 1996-08-12 1997-05-13 Demag Delavel Turbomachinery Corp. Turbocare Division Expanding bell seal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642025A (en) * 1983-06-09 1987-02-10 Bbc Brown, Boveri & Company, Limited Valve for steam supply on double casing turbines
US5037269A (en) * 1990-01-26 1991-08-06 Westinghouse Electric Corp. Self-locking nozzle blocks for steam turbines
US5628617A (en) * 1996-08-12 1997-05-13 Demag Delavel Turbomachinery Corp. Turbocare Division Expanding bell seal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10310678B3 (en) * 2003-03-12 2004-09-23 Atlas Copco Energas Gmbh Expansion turbine stage

Also Published As

Publication number Publication date
DE59910136D1 (en) 2004-09-09
EP1046788B1 (en) 2004-08-04

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