EP1723312B1 - Rotor end - Google Patents

Abstract

A rotor end piece for a rotor of a thermal turbomachine having a circumferential slot includes two end piece halves having side faces opposite one another in the installed state and top surfaces adjoining one another, the side faces of the end piece halves being connected to one another in a form-fitting manner by means of a dovetail interlocking connection, and a whole intermediate end piece having a top surface, the two interlocked end piece halves being firmly connected to the whole intermediate end piece in the region of the top surfaces via a weld.

Description

Technical area

The invention relates to the field of power plant technology. It relates to a rotor end for rotors of thermal turbomachinery according to the preamble of patent claim 1 and a method for assembling the rotor end.

State of the art

Thermal turbomachines, such as turbines and compressors, consist essentially of a rotor-equipped rotor and a stator in which vane n are suspended.

The fixed guide vanes have the task of directing the flow of the compressed or the gaseous medium to be relaxed on the rotating rotor blading so that the energy conversion takes place with the best possible efficiency.

Both blades and vanes essentially comprise an airfoil and a blade root. In order to secure the blades on the rotor or the stator vanes in the stator, grooved in the stator and on the rotor shaft. In these grooves, the feet of the blades are inserted and locked there.

It is known to alternately mount rotor blades and intermediate pieces in the rotor rotation (circumferential groove) in compressor rotors with circumferential grooves until an opening remains in the circumferential direction, which is filled up with a so-called rotor-end. The rotor end consists of a halved intermediate piece (two end halves), and a wedge. To install the halved intermediate piece a residual opening is required, which is finally closed by inserting a wedge. The two end halves each have a straight side surface formed, which forms at its upper end with the upper top surface of the tail half a protruding cloth. The side surfaces mentioned are opposite in the installed state, in which case the wedge is located between them. After the two end halves and the wedge are installed, the lobes of the two end halves are finally caulked over the wedge. This known rotor-end is supported on the rotor.

A disadvantage of this prior art is that the wedge is due to the tilting moment of the two end halves, which is caused by the centrifugal force during operation, able to aufzubiegen the caulked lobes. The wedge can thus fly out of the compressor and it can lead to a complete compressor damage.

The Applicant is also known rotor end for rotors of thermal turbomachinery with circumferential groove, which is known from two end halves with in the installed state opposite side surfaces and adjacent top surfaces, in which the side surfaces of the end halves form fit, by means of a known dovetail Imposition, are interconnected. The two Final halves are locally welded together in the area in which the side surfaces and the top surfaces of the two end halves adjoin one another. This is to achieve a solid anchoring of the rotor end in the installed state. At high loads, this anchoring is often not enough.

Other rotor locks according to the prior art are made of EP-A 1 028 231 respectively. DE-B 1 128 864 known.

Presentation of the invention

The aim of the invention is to avoid the mentioned disadvantages of the prior art. The invention is based on the object to develop a rotor-end, which can be easily manufactured and assembled and in which a detachment during operation is prevented, so that the occurrence of compressor damage is avoided.

According to the invention, this object is achieved with a rotor end for rotors of thermal turbomachinery in that the rotor end consists of two end halves and a complete tail adapter, the tail halves are connected by dovetail attachment of the adjacent two side surfaces form-fitting together and the two imposed end halves are firmly connected to the entire final intermediate piece over a weld in the area of the top surfaces.

1. a) In einem ersten Schritt wird in den Restspalt das ganze Schluss-Zwischenstück montiert.
2. b) In einem zweiten Schritt wird die erste Schlusshälfte von oben in die Umfangsnut des Rotors eingeführt.
3. c) In einem dritten Schritt wird diese erste Schlusshälfte seitlich in der Umfangsnut verschoben, bis sie im Rotor verankert ist
4. d) In einem vierten Schritt wird die zweite Schlusshälfte neben der bereits eingebauten ersten Schlusshälfte montiert.
5. e) In einem fünften Schritt wird die zweite Schlusshälfte so weit in die entgegengesetzte Richtung der Umfangsnut geschoben, bis die erste und die zweite Schlusshälfte über die Schwalbenschwanz-Verhängung formschlüssig miteinander verhängt sind.
6. f) In einem sechsten Schritt werden schliesslich die beiden formschlüssig verbundenen Schlusshälften mit dem ganzen Schluss-Zwischenstück im Bereich der Deckflächen verschweisst.

According to the invention, this object is achieved in a method for assembling the rotor end by carrying out the following steps:

1. a) In a first step, the entire final spacer is mounted in the residual gap.
2. b) In a second step, the first end half is inserted from above into the circumferential groove of the rotor.
3. c) In a third step, this first end half is displaced laterally in the circumferential groove until it is anchored in the rotor
4. d) In a fourth step, the second end half is mounted next to the already installed first half end.
5. e) In a fifth step, the second end half is pushed so far in the opposite direction of the circumferential groove until the first and the second half closure are imposed on the dovetail attachment form-fitting together.
6. f) In a sixth step, finally, the two form-fitting connected end halves are welded together with the entire final intermediate piece in the area of the top surfaces.

The advantages of the invention are that the rotor-end is anchored in the installed state both positive and cohesive and thus extremely firmly anchored. In addition, the items of the inventive rotor-end are easy to prepare and the assembly is not complicated compared to the known prior art. Releasing during operation is prevented with certainty, so that the occurrence of compressor damage is avoided

Brief description of the drawings

Fig. 1

in einer Seitenansicht die beiden Schlusshälften mit Schwalbenschwanzverhängung;

Fig. 2

eine Seitenansicht des ganzen Schluss-Zwischenstückes mit Vorbereitung der Schweissnaht;

Fig. 3 a-d

einzelne Schritte zur Montage des erfindungsgemässen Rotor-Schlusses in die Umfangsnut des Rotors;

Fig. 4

eine Draufsicht auf zwei in der Umfangsnut eingehängte Laufschaufeln mit dem fertig montierten und verschweissten erfindungsgemässen Rotor-Schluss und

Fig. 5

einen Schnitt entlang der Linie V-V in Fig. 4.

In the drawing, an embodiment of the invention is shown. Show it:

Fig. 1

in a side view the two tail halves with dovetail suspension;

Fig. 2

a side view of the entire final intermediate piece with preparation of the weld;

Fig. 3 ad

individual steps for mounting the rotor end according to the invention in the circumferential groove of the rotor;

Fig. 4

a plan view of two hung in the circumferential groove blades with the fully assembled and welded rotor end according to the invention and

Fig. 5

a section along the line VV in Fig. 4 ,

In the figures, the same positions are respectively provided with the same reference numerals. The direction of movement of the parts during installation ( Fig. 3 ) is marked with arrows.

Ways to carry out the invention

Hereinafter, the invention with reference to an embodiment and the Fig. 1 to 5 explained in more detail.

Fig. 1 and Fig. 2 show the side views of the "items" of a eferrenungsgemäße rotor-end for a compressor rotor before installation, and indeed shows Fig. 1 the two end halves 1, 1 'and Fig. 2 the whole final intermediate 2.

The in the installed state opposite side surfaces 3, 3 'of the end halves 1, 1' are designed such that they allow a known dovetail suspension of the end halves 1, 1 '. For this purpose, the first end half 1 has a recess 4 in the side surface 3, while the side surface 3 "of the second end half 1 'has a projection 5 which fits precisely into this recess 4 (FIG. Fig. 1 ). An assembly (hanging) of the two parts 1 and 1 'therefore leads to a positive connection ( Fig. 3d ). In order to secure the imposed end halves 1, 1 'and the entire closing intermediate piece 2 in the installed state, a weld seam preparation 8 is provided in the region of the cover surfaces 6, 6' of the two end halves 1, 1 'and the top surface 7 of the closing intermediate piece 2 , in which then a weld 9 is welded.

In the Fig. 3a to 3d the assembly process of the rotor end is shown. First, in the circumferential groove 10 of the compressor rotor 11, all the blades 12, 12 ', etc., and intermediate pieces are mounted until a Residual opening 13 is created, in which only the rotor end can be mounted. Its assembly takes place as follows:

In a first step, the entire final intermediate piece 2 is first installed in the circumferential groove 10. Then, the first end half 1 is inserted from above into the circumferential groove 10 ( Fig. 3a ) and in a third step laterally displaced in the circumferential groove 10 until it is anchored in the rotor 11 ( Fig. 3b ). Thereafter, in a fourth step, the second end half 1 'is mounted next to the already installed first end half 1 ( Fig. 3c ) and pushed in a fifth step so far in the opposite side of the circumferential groove 10 until the two end halves 1, 1 'are positively connected. The two parts 1, 1 'are thus imposed on the dovetail Fig. 3d ). Finally, in a sixth step, the two form-fitting connected end halves 1, 1 'and the entire closing intermediate piece 2 are secured in the region of the cover surfaces 6, 6, 7 by means of a welded seam 9.

The advantages of the invention are that the rotor-end is firmly anchored in the installed state positively and cohesively. This anchoring of the rotor end prevents disengagement during operation and thereby causing damage to the turbomachine. In addition, the items of the inventive rotor-end are easy to produce, you need no additional wedge more, and the assembly is not complicated compared to the prior art.

Of course, the invention is not limited to the embodiment described above.

LIST OF REFERENCE NUMBERS

1, 1 '

final half

2

whole final intermediate piece

3, 3 '

Side surfaces of the end halves

4

deepening

5

head Start

6, 6 '

Top surfaces of the end halves

7

Top surface of the final intermediate piece

8th

Weld preparation

9

Weld

10

circumferential groove

11

rotor

12.12 '

blade

13

Residual opening in the circumferential groove

Claims (2)

1. Rotor end piece for rotors (11) of thermal turbomachines having a circumferential slot (10), consisting of two end piece halves (1, 1') having side faces (3, 3') opposite one another in the installed state and top surfaces (6, 6') adjoining one another, the side faces (3, 3') of the end piece halves (1, 1') being connected to one another in a form-fitting manner by means of a dovetail interlocking connection, characterized in that the rotor end piece further consists of a whole intermediate end piece (2) having a top surface (7) and the two interlocked end piece halves (1, 1') being firmly connected to the whole intermediate end piece (2) in the region of the top surfaces (6, 6', 7) via a weld (9).
2. Method of fitting a rotor end piece according to Claim 1 in a residual opening (13) of a circumferential slot (10) of a rotor (11) of a thermal turbomachine, characterized in that

   a) in a first step, the whole intermediate end piece (2) is fitted in the residual opening (13),

   b) in a second step, the first end piece half (1) is inserted into the circumferential slot (10) of the rotor (11) from above,

   c) in a third step, this first end piece half (1) is displaced laterally in the circumferential slot (10) until it is anchored in the rotor (11),

   d) in a fourth step, the second end piece half (1') is inserted next to the already installed first end piece half (1) into the circumferential slot (10) of the rotor (11) from above,

   e) in a fifth step, the second end piece half (1') is pushed into the opposite side of the circumferential slot (10) until the first end piece half (1) and the second end piece half (1') are interlocked in a form-fitting manner via the dovetail interlocking connection, and

   f) finally, in a sixth step, the two end piece halves (1, 1') connected in a form-fitting manner are welded to the whole intermediate end piece (2) in the region of the top surfaces (6, 6', 7).

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