Method of mounting rotor blades on a rotor disk, and clamping device for performing such a method

Inactive Publication Date: 2017-12-07
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]According to one embodiment of the method according to the invention, the predetermined pretension in step c) is created at least partially by a torsional movement of the rotor blades around their longitudinal axis. In this way, a firm hold between the shrouds of the rotor blades is achieved. Such a torsional movement can for example be brought about by a basically axially extending middle line of a radially inner region and a basically axially extending middle line of a radially outer region of each rotor blade being produced with a specific offset which is then compensated in step b), creating a torsional stress.
[0012]Each rotor blade advantageously comprises a blade root, wherein the rotor disk and the clamping elements have in each case blade root locating slots which are designed to correspond to the blade roots and which after carrying out step b) can be arranged in alignment with each other in such a way that the rotor blades which are retained on the clamping elements can be pushed out of the blade locating slots of the clamping

Problems solved by technology

During operation, the blade airfoils are subjected to dynamic loads, which can lead to harmful vibrations and to fatigue during high load cycles.
On accoun

Method used

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Examples

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Example

[0028]The subsequently described method according to an embodiment of the present invention serves for mounting rotor blades 1 on a rotor disk 2 along a predetermined pitch circle diameter D in such a way that shrouds of adjacent rotor blades 1 mounted on the rotor disk 2 in the intended manner and in the cold state are clamped against each other with a predetermined pretension, for which a clamping device 4 having a clamping elements 3 is used according to the invention.

[0029]The rotor blades 1 comprise in each case in a known manner a blade root 5, a blade airfoil 6 and a shroud 7. The shrouds 7 of adjacent rotor blades 1 are provided on their radial end faces pointing toward each other with corresponding connecting elements which are brought into engagement with each other in the radial direction R and define an undercut in the axial direction A. In the present case, the connecting elements are formed by projections 8 on the one hand and on the other hand by recesses 9 which are des

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Abstract

A method for mounting rotor blades on a rotor disk along a predetermined pitch circle diameter in such a way that adjacent rotor blades, when properly mounted on the rotor disk and in the cold state, are clamped against each other with a predetermined preload. A clamping device which performs such a method has a plurality of clamping elements which are arranged in a uniformly distributed manner around a central axis, the number of which corresponds to the number of rotor blades to be mounted on the rotor disk and which in each case are designed for the locating of a rotor blade, wherein the clamping elements are moveable radially, exerting a radially inwardly directed force.

Description

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Claims

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Application Information

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Owner SIEMENS AG
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