EP0846844A1 - Rotor assembly with rotor discs connected by both non-positive interlocking and interpenetrating or positive interlocking means - Google Patents

Abstract

The assembly comprises individual rotor discs (1.i) which are positioned concentrically and axially in a row, and are non-positively connected by tension rods (2), to form a compact unit. Neighbouring rotor discs are additionally connected via a further positive and-or material connection (3,4). This is a weld joint, located between neighbouring discs on a larger diameter than the graduated rotor circle (2.1) of the tension rods. The additional connection may be a conical centering, formed by a positive/negative ring cone or double ring cone on each rotor disc.

Description

Technical field

The invention relates to a rotor for turbomachinery according to the Preamble of claim 1.

State of the art

A rotor for turbomachinery is made up of several rotor disks built up, these are lined up axially and concentrically be aligned. The rotor disks can carry the blading or washers and are clamped together by, generally several, tie rods and thus form a compact unit. However, this only as long as the axial forces of the tie rods are high enough to the frictional connection between the individual rotor disks guarantee. In practice, which is mainly due to the Thermal expansion is affected due to the high operating temperatures is, however, not always the friction given. So shifts occur in the individual Rotor disks against each other, which lead to non-circular running System and at least to a shutdown or to their can lead to partial destruction. This has stopped the system and thus the loss of production. To the Loss of production, however, still come the system damage, which in particular lead to extremely expensive repairs, if they are repairable at all.

Presentation of the invention

The invention tries to avoid all these disadvantages. your the task is based on a rotor for turbomachinery to indicate which is naturally trained or something can be retrofitted that an operational Misalignment [rotation or displacement] of rotor disks to each other is avoided.

The solution to this problem is with the characteristics of the license plate circumscribed by claim 1. Advantageous embodiments of such a rotor for turbo machines are through specified the features of the dependent claims.

Brief description of the drawing

Fig. 1

durch achsparallele Zuganker verspannte Rotorscheiben mit einer zusätzlichen Verbindung in Form einer Schweissnaht,

Fig. 2

ein Detail zu Fig. 1,

Fig. 3

ein weiteres Detail zu Fig. 1,

Fig. 4

durch die Rotorachse kreuzende Zuganker verspannte Rotorscheiben,

Fig. 5

durch Zuganker verspannte Rotorscheiben mit einer zusätzlichen Verbindung in Form einer doppelkonusförmingen Zentrierung.

Further features and advantages result from the description of exemplary embodiments with reference to the drawing

Fig. 1

rotor discs braced by axially parallel tie rods with an additional connection in the form of a weld seam,

Fig. 2

a detail of Fig. 1,

Fig. 3

another detail of FIG. 1,

Fig. 4

rotor discs braced by tie rods crossing the rotor axis,

Fig. 5

rotor discs braced by tie rods with an additional connection in the form of a double-cone-shaped centering.

It is only essential for understanding the invention Elements shown; in particular is not the on known and unchanged part of the rotor or others Rotor details etc. shown.

Way of carrying out the invention

In the case of a rotor 1 for turbomachinery, the individual rotor disks are 1.i, which, as blade disks 1.i.1 or as Intermediate discs 1.i.2 can be formed, axially strung together and clamped together concentrically by tie rods 2. The rotor disks 1.i have defined contact surfaces 1.i.1.1 or 1.i.2.1, with which they come together support and to which those caused by the tie rods 2 Attack frictional forces. These are supposed to be through the non-positive Connection a rotation or displacement of the rotor disks prevent each other in the operation of the system. However, it can Operating conditions in which these frictional forces are insufficient, a misalignment of the rotor disks 1.i against each other to prevent. Therefore, in the case of a Embodiment of a rotor 1 [Fig. 1 ... 3] in addition to non-positive connection of the rotor disks 1.i another one material connection 3 in the form of a weld seam intended. This can be a continuous or a discontinuous, be weld seam running in sections [Fig. 3]. This weld seam connects two neighboring ones Rotor disks 1.i together and thereby prevents them Execute relative movements of the two rotor disks against each other can. This additional one made by the welds Compound 3 is essentially outside the pitch circle the tie rod 2, i.e. on a larger diameter than that Pitch circle 2.1 of the tie rods, arranged.

In another variant of a rotor 1 according to the invention [Fig. 5] is the additional connection of the rotor disks 1.i as a cone-shaped, preferably a double-cone-shaped Centering 4 formed. This shows a positive or negative ring double cone 4.i.1 or 4.i.2 on each of the cooperating with rotor disks 1.i, each a positive ring double cone 4.i.1 with a negative ring double cone 4.i.2 of the two adjacent rotor disks in active connection is. This conical centering 4 is also outside the screw pitch circle 2.1 the tie rod 2 arranged. The double cone preferably has a flank angle from 30 ... 60 degrees. The conical centering 4 results in a form-fitting holder in the radial direction and also increases the Friction surfaces between the rotor disks 1.i and thus the Size of the transferable friction forces.

Reference numerals

rotor 1 Rotor disks 1.i Blade disks 1.i.1 Washers 1.i.2 Contact surfaces 1.i.1.1 or 1.i.2.1 Tie rod 2nd Pitch circle 2.1 material connection [weld connection] 3rd conical centering 4th positive ring double cone 4.i.1 negative ring double cone 4.i.2

Claims (6)

Rotor for turbomachinery, the individual rotor disks, which carry the turbine or compressor blades or vane-less intermediate disks, are in a concentrically axially arranged arrangement and are connected with tie rods, whereby the rotor disks braced against each other form a compact unit, characterized in that adjacent rotor disks additionally for the non-positive connection by the tie rods [2] to one another have at least one further connection [3, 4], which is designed to be form-fitting and / or material-locking. Rotor according to claim 1, characterized in that the additional connection of the rotor disks [1.i] is a welded connection [3], which between each adjacent rotor disk [1.i] has a larger diameter than the screw pitch circle [2.1] of the tie rods [2 ] is provided. Rotor according to claim 2, characterized in that the additional weld connection [3] is a continuous or section weld seam. Rotor according to one of claims 1 to 3, characterized in that the additional connection of the rotor disks [1.i] is a conical centering [4]. Rotor according to claim 4, characterized in that the conical centering [4] is provided as a positive or negative ring cone or ring double cone [4.i.1 or 4.i.2] on each rotor disk [1.i], with each a positive ring cone or ring double cone is in operative connection with a negative ring cone or ring double cone of the adjacent rotor disc [1.i]. Rotor according to claim 5, characterized in that the conical centering [4] is arranged outside the screw pitch circle [2.1] of the tie rods [2].

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