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EP1046788A1 - Diffuseur - Google Patents

Diffuseur Download PDF

Info

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)
English (en)
Other versions
EP1046788B1 (fr
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/fr
Priority to DE59910136T priority patent/DE59910136D1/de
Publication of EP1046788A1 publication Critical patent/EP1046788A1/fr
Application granted granted Critical
Publication of EP1046788B1 publication Critical patent/EP1046788B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19990810328 1999-04-21 1999-04-21 Diffuseur Expired - Lifetime EP1046788B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19990810328 EP1046788B1 (fr) 1999-04-21 1999-04-21 Diffuseur
DE59910136T DE59910136D1 (de) 1999-04-21 1999-04-21 Diffusor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19990810328 EP1046788B1 (fr) 1999-04-21 1999-04-21 Diffuseur

Publications (2)

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

Family

ID=8242779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990810328 Expired - Lifetime EP1046788B1 (fr) 1999-04-21 1999-04-21 Diffuseur

Country Status (2)

Country Link
EP (1) EP1046788B1 (fr)
DE (1) DE59910136D1 (fr)

Cited By (1)

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

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 (de) * 2003-03-12 2004-09-23 Atlas Copco Energas Gmbh Expansionsturbinenstufe

Also Published As

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

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