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
  • 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
  • F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
  • F01D11/127—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with a deformable or crushable structure, e.g. honeycomb
• • 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
  • F05D2300/00—Materials; Properties thereof
  • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
  • F05D2300/612—Foam

Definitions

• the invention relates to a brush seal between a wall section and the blade tips of a gas turbine.
• the invention further relates to a Method for producing a gas turbine with such a sealing seal.
• the technical environment in particular refer to EP 0 605 417 B1 and to US 5,388,959.
• Brush seals from or in gas turbines essentially have two Fulfill tasks, namely firstly a flow around the individual running stages prevent the gas turbine and secondly the housing structure or thermally isolate the hot gas in the gas turbine wall sections or control the heat flow passing into the wall sections in such a way that the thermal expansion of the casing is simultaneous with the thermal expansion of the rotating blades or the discs carrying them.
• the so-called gap between the tips of the turbine blades and the these surrounding wall sections or that on the wall sections The intended sealing seal should be over the entire operating range the gas turbine should be as small as possible because of any enlargement of the gap dimension a reduction in thrust and thus a reduced Efficiency.
• the object of the present invention to show an improved sealing seal between a wall section and the blade tips of a gas turbine.
• the solution to this problem is characterized in that the brush seal consists entirely of a foamed, metallic, corrosion-resistant high-temperature alloy.
• two advantageous methods for producing a gas turbine with such a metal foam brush seal are specified.
• the invention proposed here replaces the above. known Sealing systems through a metal foam.
• a uniformly foamed, corrosion-resistant high-temperature alloy such as. Hastalloy X, IN 601, ODS alloys are the ones mentioned Requirements met in an excellent way.
• the one is younger Metal foam technology that has become up to date to the specialist basically known.
• a suitable metal alloy is used
• the present invention is a metallic corrosion-resistant High temperature alloy - foamed using known methods, so that an essentially fine foam structure forms, whereby thin metal walls enclose a variety of cavities between them.
• a foaming method for example, a metal powder mixed with a metal hydrite and then extruded, after which this primary material is thermally foamed.
• one is Appropriate manufacture from prefabricated hollow metal spheres possible. In general, this produces a mainly closed-pore foam Structure with high porosity and good thermal insulation properties educated.
• solder does not migrate (as for example in the case of open-pore structures or metal felts) from the joint into the sealing structure due to capillary forces; so that the foam is easy to solder.
• An alternative production method is to connect the unfoamed primary material to the respective wall section or to the housing structure in a first process step and to foam this primary material in a second process step. This is followed by machining, of course, to bring the metal foam or the sealing gasket into the desired shape.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Turbine Rotor Nozzle Sealing (AREA)
• Sealing Material Composition (AREA)
• Sealing With Elastic Sealing Lips (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=7891283

Family Applications (1)

Country Status (3)

Cited By (4)

Families Citing this family (8)

Citations (3)

Family Cites Families (5)

• 1998
  • 1998-12-16 DE DE19858031A patent/DE19858031A1/de not_active Withdrawn
• 1999
  • 1999-12-09 AT AT99124032T patent/ATE259027T1/de not_active IP Right Cessation
  • 1999-12-09 EP EP99124032A patent/EP1013890B1/fr not_active Expired - Lifetime
  • 1999-12-09 DE DE59908461T patent/DE59908461D1/de not_active Expired - Lifetime

Patent Citations (3)

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