MXPA06010107A - Rotor end - Google Patents

Abstract

The invention relates to a rotor-end for rotors (11) of thermal turbo machines, comprising a peripheral groove (10). The inventive rotor end consists of two end halves (1, 1') having lateral surfaces (3, 3') which are opposite each other when in a built-in state and adjacent covering surfaces (6, 6'). The lateral surfaces (3, 3') of the rotor halves (1, 1') are connected in a positive fit by means of a dovetail suspension. Said rotor end also consists of an entire end intermediate piece (2) provided with a covering surface (7). Both of the suspended end halves (1, 1') are rigidly connected to the entire end intermediate piece (2) by means of a welding seam (9) in the region of the covering surfaces (6, 6', 7). The solid anchoring of the rotor end (1), obtained in said manner, prevents detachment during operation and also the above-mentioned damage to the turbo machine.

Description

EXTREME ROTOR PIECE FIELD OF THE INVENTION The invention relates to the field of energy management plant technology. This relates to an end rotor part for thermal turbomachine rotors in accordance with the preamble of claim 1 of the patent and with a method for securing the rotor end piece. BACKGROUND OF THE INVENTION Thermal turbomachines, such as turbines and compressors, essentially comprise a rotor equipped with movable vanes and a stator in which the guide vanes are suspended. The task of the fixed guide vanes is to direct the flow of the gaseous medium to be compressed or expanded depending on the rotation of the moving vanes in such a way that the energy conversion is carried out with the best possible efficiency. Both types, the mobile vanes and the guide vanes have essentially an aeromic wing profile and a blade insert. With the purpose of having the ability to secure the movable vanes on the rotor or guide vanes in the stator, in the stator and on the rotor shaft there are concave slots. The blade inserts are pushed into these slots and immobilized therein.

Ref .: 175543 It is known in the case of the compressor rotors, which have circumferential grooves to alternately mount the movable vanes and intermediate pieces in a rotating rotor guide channel (circumferential groove) until an opening remains in the circumferential direction, this The opening is filled with a "rotor end piece".

The end piece of the rotor consists of an intermediate piece divided in half (two halves of end piece) and of a wedge. To mount the intermediate piece halved, a residual opening is required, which is finally closed by pressing a wedge inwardly. Each of the two end piece halves has a straight side face, which at its upper end forms a projected lobe with the upper surface of the end piece half. The side faces are opposite one another in their installed state, the wedge is then placed between them. Once the two end piece halves and the wedge have been installed, the lobes of the two end piece halves are finally caulked with the wedge. This known rotor end piece is supported on the rotor. A disadvantage of this technique of the previous state is that the wedge, due to the tilting moment of the two halves of the end piece, which is generated by the centrifugal forces during the operation, can become flexed by opening the cracked lobes. The wedge in this way can be detached from the compressor and complete compressor damage can occur.

Additionally, the applicant is familiar with an extreme rotor part which is designed for thermal turbomachinery rotors having a circumferential groove and is composed of two end piece halves that have opposite side faces to one another when in their installed state and upper surfaces contiguous with each other and in which the lateral faces of "The end piece halves are connected to each other so that they fit precisely, to be specific by means of a known dovetail interlock connection, in which case the two end piece halves are welded locally with each other in the region in which the side faces and the top faces of the two end piece halves are contiguous with one another This is intended to obtain a firm anchoring of the rotor end piece in its installed state. However, under great stress, this anchoring is often not enough SUMMARY OF THE INVENTION The purpose of the invention is to avoid the disadvantages of the prior art The object of the invention is to develop an end piece of a rotor which can be produced and assembled in a simple way and in which decoupling during operation is avoided, whereby motor damage is prevented from occurring.

In accordance with the invention, this object is achieved with an end rotor part for thermal turbomachinery rotors - where the end rotor part consists of two end piece halves and one complete intermediate end piece, the end piece halves are they are connected to each other in a way that they are precisely adjusted by means of a dovetail inter-connection connection of the two adjacent end part halves, and the two inter-end end halves are firmly connected to the intermediate end piece complete in the region of the upper surfaces by means of welding. According to the invention, the objective is achieved with a method for mounting the rotor end piece by carrying out the following steps: a) In a first step, the complete intermediate end piece is mounted in the residual groove. b) in a second step, the first end piece half is inserted into the circumferential groove of the previous rotor. c) In a third, this first end piece half is displaced laterally in the circumferential groove until it is anchored in the rotor. d) In a fourth step, the second half of the end piece is mounted next to the first half of the end piece already installed. e) In a fifth step, the second end piece half is pushed into the opposite side of the circumferential groove until the first and second end piece half are interlocked in a way that they are accurately fixed by means of the dovetail interlock connection. f) Finally, in a sixth step, the two end piece halves connected in a precisely fixing manner are welded with the complete intermediate end piece in the region of the top surfaces. The advantages of the invention consist in the fact that the end piece of the rotor is anchored both in a precise fixed manner and in an integral manner in its installed state - and for this reason it is anchored in an extremely firm form. Additionally, the individual parts of the rotor end part according to the invention can be produced in a simple manner and the assembly is no more complicated compared to those known from the prior art. A decoupling is avoided with certainty during the operation, so that damage to the compressor is prevented. BRIEF DESCRIPTION OF THE FIGURES An exemplary embodiment is shown in the Figures, in which: Fig. 1 shows a side view of the two end piece halves with a dovetail interfit connection; Fig. 2 shows a side view of the intermediate end piece complete with a preparation for welding; Figures 3a-3d show the individual steps for mounting the rotor end part according to the invention in the circumferential groove of the rotor; Fig. 4 shows a plan view of two movable vanes mounted in the circumferential groove and having the rotor end part already assembled - and welded in accordance with the invention, and Fig. 5 shows a sectional view throughout of the line V-V in Fig. 4. In each case the similar elements are provided with the same designations in the figures. The direction of movement of the parts during installation (Fig. 3) is designated by arrows. DETAILED DESCRIPTION OF THE INVENTION The invention is explained in more detail below with reference to an exemplary embodiment and to Figs. 1 to 5. Figures 1 and 2 show the side views of the "individual parts" of a rotor end part according to the invention for a compressor rotor before installation; to be precise, Fig. 1 shows the two end piece halves 1, 1 'and Fig. 2 shows the complete intermediate end piece 2. The side faces 3, 3' of the end piece halves 1, 1 'are Opposite to one another in their installed state are designed in such a way as to allow a dovetail inter fi xing connection of the end piece halves 1, 1 'which is known per se. For this purpose, the first half of end piece 1 has a cavity 4 on the side face 3, while the side face 3 'of the second half of end piece 1' has a projection 5 which is mounted securely within this cavity 4 (Fig. 1). The junction (interfiber connection) of the two parts 1 and 1 'therefore leads to form an assembly (Fig. 3d). For the purpose of securing the interflange end piece halves 1, 1 'and the complete intermediate end piece 2 in their installed state, a welding preparation 8 is provided in the region of the upper surfaces 6, 6' of the two halves of end piece 1, 1 'and the upper surface 7 of the intermediate end piece 2, then a weld 9 is produced in this welding preparation 8. The operation for mounting the rotor end piece is shown in Figures 3a to 3d. Before anything else, all the moving vanes 12, 12 ', etc., and the intermediate pieces are mounted in the circumferential groove 10 of the compressor rotor 11 until a residual opening 13 is obtained, within which can only be mounted the extreme piece of rotor. This is assembled as follows: In a first step, first of all the complete intermediate end piece 2 is installed in the circumferential groove 10. The first end piece half 1 is inserted into the circumferential groove 10 above (Fig. 3a) and , in a third step, it is displaced laterally inside the circumferential groove 10 until it is anchored in the rotor 11 (Fig. 3b). After that, in a fourth step, the second half of end piece 1 'is mounted next to the first half of the already installed end piece 1 (Fig. 3c) and, in a fifth step, is pushed into the opposite side of the circumferential groove 10 until the two end piece halves 1, 1 'are connected in a way that they are accurately fixed. The two parts 1, 1 'are thus interfined by means of the dovetail (Fig. 3d). Finally, in a sixth step, the two end piece halves 1, 1 'connected in a precisely fixing manner and the complete intermediate end piece 2 are secured in the region of the upper surfaces 6, 6', 7 by means of a weld 9. The advantages of the invention consist in ^ the fact that the rotor end part is firmly anchored in a manner that is fixed precisely and in an integral manner in its installed state. As a result of this anchoring of the rotor end piece. its decoupling is avoided during the operation and damage to the turbomachine. Additionally, the individual parts of the rotor end part according to the invention can be produced in a simple manner, an additional wedge is no longer needed, and the assembly is not more complicated compared to what is known in the previous state of The technique. The invention is of course not restricted by the exemplary embodiment described above. LIST OF DESIGNATIONS 1, 1 'Half of the end piece 2 End piece complete complete 3, 3' Side faces of the halves of the end piece 4 Cavity 5 Projection 6, 6 'Top surfaces of the end piece halves 7 Top surface of the piece intermediate end 8 Welding preparation 9 Welding 10 Circumferential groove 12, 12 'Moving wing 13 Residual opening in the circumferential groove It is noted that in relation to this date, the best method known to the applicant to carry out the said invention, is that which is clear from the present description of the invention.

Claims (2)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property. An end rotor part for thermal turbomachinery rotors having a circumferential groove, characterized in that it consists of two end part halves having opposite side faces one with another in an installed state and the upper surfaces contiguous with each other, the faces The halves of the end piece halves are connected to one another in a way that they are fixed precisely by means of a dovetail interfit connection, and of a complete intermediate end piece having an upper surface, the two halves of interfix end pieces are firmly connected with the complete intermediate end piece in the region of the upper surfaces by means of a weld. A method for assembling a rotor end piece, according to claim 1, in a residual opening of a circumferential groove of a rotor of a thermal turbomachine, characterized in that: a) in a first step, the complete intermediate end piece is mounted in the residual opening, b) in a second step, the first end piece half is inserted into the circumferential groove of the previous rotor, c) in a third step, this first end piece half is displaced laterally within the circumferential groove until it is anchored in the rotor, d) in a fourth step, the second half of end piece is inserted next to the first half of the end piece already installed inside the circumferential groove above the rotor, e) in a fifth step, the second half of extreme piece is. pushed into the opposite side of the circumferential groove until the first half of the end piece and the second end piece half are interlocked in a manner that is accurately fixed by means of the dovetail interfit connection, and f) finally, in a sixth step, the two end piece halves connected in a precisely fixing manner are welded with the complete intermediate end piece in the region of the top surfaces.