Stator vane segment for a turbomachine, associated manufacturing method and turbomachine

Abstract

The invention relates to a guide blade segment (2) of a thermal turbomachine, in particular a gas turbine, comprising a number of profiled blades (6) which are arranged on a platform (8). A plurality of securing elements (14) for securing the guide blade segment (2) to an associated guide blade support are arranged on the side of the platform (8) which is oriented away from the blade(s). The aim of the invention is to provide a guide blade segment (2) which can be produced in a simple and economical manner avoiding casting problem areas enabling the guide blade segment to be attached in a particularly reliable and secure manner to the associated guide blade support. According to the invention, at least one section of at least one of the securing elements (14) is a separately produced component which is rigidly connected to the platform (8) or to an additional section of the securing element (14).

Description

technical field [0001] The invention relates to a guide vane segment of a thermal turbine, in particular a gas turbine, having at least one profiled airfoil arranged on a blade platform, wherein a certain arrangement is provided on the substantially flat side of the blade platform facing away from the blade airfoil. A number of fastening elements are used to fasten the blade segment to the corresponding guide vane carrier. Background technique [0002] Gas turbines are used in many fields to drive generators or working machines. In this case, the energy enthalpy of the fuel is used to bring about the rotational movement of the turbine shaft. For this purpose, fuel is burned in a combustion chamber, where compressed air is supplied by an air compressor. The working medium produced by the combustion of the fuel in the combustion chamber passes through the turbine unit connected downstream of the combustion chamber and expands there to perform work. [0003] To bring about t...

AI Technical Summary

Problems solved by technology

[0007] The hook-shaped fixing elements protruding from the blade platform present various difficulties in the manufacturing process

The production of wax patterns is already quite laborious, since complex wax tools with a large number of so-called mask elements or slides are required to form the fastening hooks

The fixing hooks are also a problem area from a casting point of view, since the undercuts in the shell structure of the mold can only be sanded poorly and always result in blowhole defects due to their exposed position during the subsequent casting process, ie due to the cooling hooks Material defects caused by heat shrinkage within the part

[0008] In addition, it is often difficult to keep the retaining hook fit precisely within the required tolerances in the associated mounting groove, especially for designs with small proportional radii of curvature

Sealing problems may therefore also occur at these locations during subsequent turbine operation

Images