Sealing plate and rotor blade system

Abstract

A rotor blade system, for example, of a gas turbine is provided. The rotor blade system includes a plurality of rotor blades which are arranged annularly on a rotor disk. A plurality of sealing plates are arranged on a side surface of the rotor disk. An individual sealing plate is formed from a plurality of metal sheets, wherein two of the metal sheets are arranged opposite each other a distance apart and parallel to a plane of the sealing plate, forming a gap for guiding of cooling air.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2010 / 053917, filed Mar. 25, 2010 and claims the benefit thereof. The International Application claims the benefits of European application No. 09004469.4 filed Mar. 27, 2009. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention refers to a sealing plate for forming a ring consisting of sealing plates for the rotor of a gas turbine, which sealing plate is formed principally from a multiplicity of metal sheets. In addition, the invention refers to a rotor blade system, especially for a gas turbine, having a number of rotor blades which are arranged annularly on a turbine disk, wherein a number of sealing plates are arranged on a side surface of the turbine disk. It furthermore refers to a gas turbine having such a rotor blade system.BACKGROUND OF INVENTION[0003]Gas turbines are used in many fields ...

AI Technical Summary

Benefits of technology

[0015]The invention is based in this case on the consideration that a particularly simple producibility of the sealing plate would be achievable if the previously customary investment casting process with subsequent mechanical after-machining could be either simplified or completely replaced by another production process. In this case, casting processes other than the described vacuum investment casting are not a possibility on account of the selected materials for the sealing plates. Therefore, the sealing plate should not be produced in an archetypal process, such as casting, but in a forming process. In order to be able to realize the complex shape of the sealing plates during this, the sealing plates should be produced from a multiplicity of basic parts by means of forming. This can be achieved in a particularly simple manner by forming of prefabricated metal sheets, that is to say the sealing plate should be produced from a multiplicity of metal sheets. The sealing plate in this case comprises two metal sheets which are arranged a distance apart and parallel to the plane of the sealing plate. These form the respective end faces of the sealing plate and via the distance between the two metal sheets the thickness of the sealing plate can be accurately selected. In this case, a gap remains between the metal sheets and can be utilized for conducting cooling air and therefore for internal cooling of the sealing plate. On the one hand, a particularly simple construction of the sealing plate is therefore possible, and on the other hand, as a result of active component cooling, the sealing plate can stand up to the most adverse circumstances during operation so that particularly high temperatures during operation of the gas turbine become possible and therefore particularly high efficiency is achieved.

[0022]The advantages which are achieved using the invention are especially that as a result of the construction of the sealing plate by means of a multiplicity of metal sheets a particularly simple design and construction of the sealing plate become possible. The production costs and material costs are low in this case in comparison to other methods. As a result of the flexible material pairing, the material use and costs arising therefrom can be reduced. After-machining of the large plane surfaces—as is necessary in the case of the casting process—is not necessary when using preformed metal sheets, wherein a particularly good sealing effect of the sealing plate during operation is still achieved. As a result of this, and as a result of the active component cooling by means of conducting cooling air in the sealing plate, lower restrictions for the hot gas temperature in a gas turbine ensue and a higher efficiency can be achieved overall.

Problems solved by technology

In this case, casting processes other than the described vacuum investment casting are not a possibility on account of the selected materials for the sealing plates.

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