EP3318724A1 - Sealing segment of a rotor and rotor - Google Patents

Abstract

The invention relates to a sealing segment (11) for forming a sealing ring of a rotor of a gas turbine. The T-shaped sealing segment comprises a central circumferentially and radially extending anchoring portion (13) with an adjoining fastening profile (14) for attachment in the rotor. At the other end of the anchoring portion extends axially in both directions in each case a sealing portion (15), at the end of which there is a support portion (17). In order to achieve a low weight, it is provided that the sealing sections (15) at least in sections between the center of the segment (12) and the support section (17) have a curved shape relative to the rotor axis.

Description

The invention relates to a sealing segment for forming a sealing ring in a rotor, in particular for use in a gas turbine, wherein the sealing segment is fixed with a T-shaped configuration with a central portion on the rotor.

In rotors of gas turbines, there is the problem that the inner portion of the rotor is best protected by the hot gas flowing through the gas turbine. For this purpose, sealing measures are taken in the area between the rotor discs, which prevent penetration of hot gas in the inner region of the rotor as far as possible. In one of the commonly used constructions here a seal between the rotor discs is made as close to the hot gas path. If the space between the rotor disks after the complete assembly of the rotor is no longer required, fixed sealing rings are usually used between the rotor disks, which have both a simpler shape and a simple fastening.

However, in many cases there is the requirement that the available between the rotor disks space for subsequent maintenance, especially for the replacement of blades, is available. Therefore, there is a possibility to be able to remove the sealing ring when needed. In this case, the sealing ring is not formed as a closed ring body but from a plurality of circumferentially distributed sealing segments. Their attachment in turn can be done in different ways, in a known embodiment, the sealing segments have a T-shape. These are releasably secured in the rotor with a centrally arranged section. The arms of the T-shaped sealing segment extend in this case on both sides in a straight line from the center to the rotor disks or to the rotor blades attached to the rotor blades.

Due to the T-shaped design of the sealing segments both a favorable installation on the rotor is possible, as well as an arrangement of the seal near the hot gas path can be realized. However, a problem with known embodiments is that the arms of the T-shaped sealing segment which extend on both sides deform undesirably in the case of the centrifugal forces which occur, unless a sufficiently stable design is selected. In order to prevent this, therefore relatively massive versions are chosen with high weight.

Object of the present invention is therefore to provide an improvement of the T-shaped sealing segments to the effect that they preserve the operation of the rotor, if possible, the desired shape with less weight.

The stated object is achieved by an embodiment according to the invention of a sealing segment according to the teaching of claim 1. A rotor according to the invention is specified in claim 13. Advantageous embodiments are the subject of the dependent claims.

The generic sealing segment serves to form a sealing ring of a rotor. In this respect, a plurality of sealing segments in the circumference are arranged distributed in the rotor. Which type of rotor is involved here is irrelevant in this case, with the use of the sealing segment being particularly suitable for a gas turbine. The sealing segment has a T-shaped configuration with a central circumferentially and radially extending anchoring portion. It is not mandatory that the anchoring portion has a constant thickness in the axial direction. This depends rather on the required strength or on the type of connection. At least the anchoring section has a fastening profile on the side facing the rotor axis, by means of which the sealing segment can be fastened to the rotor. In the mounting profile opposite radially outwardly facing Side is located at the anchorage a segment center. Starting from the middle of the segment of the anchoring section, a first sealing section or a second sealing section extends axially on both sides. The sealing portions thus extend substantially in the circumferential direction and in the axial direction. At the ends pointing in the axial direction of the sealing portions are each support portions. That is, at the end of the first sealing portion is a first support portion and at the axially opposite end of the sealing segment at the end of the second sealing portion is the second support portion.

According to the invention, the stability of the sealing sections is now improved by having, at least in sections, a curved shape relative to the rotor axis between the segment center and the supporting section. Due to the deviation from a rectilinear shape, a significantly improved stability of the sealing sections is achieved with the centrifugal forces occurring during operation of the rotor. As a result, a lower material thickness than usual can be used and the weight can be reduced.

Considering the curvature, one along the rotor axis, i. in a longitudinal section through the rotor axis through the sealing portions, these have a deviating from the straight shape arcuate shape with the curvature facing the rotor axis on. Here, it can be provided both that the two sealing sections to each other in the middle of the segment are unsteady, as it is also possible to perform both sealing portion over the middle of the segment continuously with a common arcuate course.

In order to realize a sealing ring formed from a plurality of circumferentially distributed sealing portions, in particular for separating the area radially outside of the sealing segment and the area on the rotor axis facing side of the sealing portions, it is also advantageous if the sealing portions each correspond to a portion of a rotating body. This favors furthermore in a particularly advantageous manner to avoid imbalance in the sealing ring by the multiple arrangement of the sealing segments in the scope. In this case, the anchoring section is also particularly preferably formed as a section of a rotational body. Thus, the sealing segments with sealing portions distributed in the circumference form an annular body.

Furthermore, it is particularly advantageous if the end of the sealing portions in the circumferential direction, at least neglecting the support portions, and the end of the anchoring portion, at least neglecting the fastening profile, in a longitudinal plane through the rotor and the rotor axis. This achieves the result that, in the arrangement of the sealing segments distributed a plurality of times around the circumference, a substantially closed annular body is formed and in this case a radially symmetrical shape and advantageous load distribution are achieved. Furthermore, the advantageous shape of the sealing segments to form a substantially closed annular body not only facilitates separation over the sealing portions over the area outside the sealing segments and within the sealing portions but also allows separation in the axial direction via the anchoring portion.

The concrete shape of the sealing portions is initially irrelevant, provided that the stability of the sealing portions is improved in the centrifugal forces occurring by the curved shape. It is particularly advantageous if the shape of the sealing portions is selected such that the centrifugal forces within the sealing portion substantially lead to compressive stresses in the direction of the respective support portion. Depending on the shape, it may furthermore be advantageous if the stresses are distributed in the sealing section and guided on the one hand to the support sections as compressive stresses and on the other hand lead to compressive stresses towards the center of the segment.

In order to realize an advantageous stress distribution, various designs are possible, wherein at least one curved to the rotor axis harmonic shape is particularly preferable. By pointing to the rotor axis curvature bending stresses in the sealing portions can be at least reduced in an advantageous manner, be avoided with a particularly advantageous shape as far as possible. As a result, a deformation of the sealing sections during rotation of the rotor is advantageously minimized or prevented.

For this purpose, it can be provided in a first advantageous embodiment that the respective sealing section, starting from the middle of the segment, first approaches the rotor axis axially in the direction of the support sections and then the distance to the rotor axis increases again up to the support sections.

In a second advantageous embodiment, a harmonic profile is selected over both sealing sections. It is advantageous if the distance of the sealing sections to the rotor axis, starting from the middle of the segment increases continuously on both sides up to the support sections.

When using the sealing segments on the rotor for the realization of a sealing ring is usually radially outside the sealing ring, a stationary stator, with a flow of hot gas in the area between the stator and rotating seal should also be minimized as far as possible. Therefore, it is also advantageous if on the outwardly facing side of the sealing portions sealing ribs for forming, for example, a labyrinth seal are arranged.

Various variants are available for the realization of the fastening profile. These depend in particular on the mounting options on the rotor. In this respect, it is possible in a first embodiment to align the mounting profile axially parallel to the rotor axis. In this respect, one is Fastening of the sealing segment with addition of the fastening profile to the rotor by an axial displacement required.

However, it is particularly advantageous if the fastening profile extends in the circumferential direction. This opens up greater possibilities with regard to the attachment of the fastening profile to the rotor. Furthermore, this considerably simplifies the production of the sealing segment as part of a rotor body. It is particularly advantageous if a sealing segment has at least two mutually spaced circumferentially, each as a part of a rotational body similar, mounting profiles with intermediate space.

For the design of the mounting profile, in turn, various options are available, provided that sufficient attachment to the rotor and a corresponding load transfer are possible. Particularly advantageous in this case a Christmas tree or a dovetail profile can be selected. This allows insertion into a corresponding complementarily shaped groove, with the radial undercut a load transfer in centrifugal force is possible. A comparable embodiment of a fastening profile is also possible if a radial undercut is present and slipping out of the fastening profile is prevented during rotation of the rotor. That the fastening profile also requires no symmetry with respect to a transverse plane perpendicular to the rotor axis.

Furthermore, it is possible in a further advantageous embodiment to form the fastening profile opposite, wherein the Christmas tree profile or dovetail profile is formed as a receiving profile on the rotor and the mounting profile C-shaped engages over the corresponding receiving profile on the rotor. In this respect, a fir tree groove or a dovetail groove or the like which opens radially towards the rotor axis is present in the fastening profile.

An advantageous separation of the spaces on both sides of the anchoring portion can already be achieved by the installation of the fastening profile over the entire length of the sealing segment in the circumferential direction. In particular, the distribution of the fastening profile in two sections, however, complicates a design with circumferentially continuous system. Therefore, it is advantageous, especially with interrupted attachment sections, but also with an uninterrupted attachment section, if the seal segment on the side of the attachment profile facing the rotor axis is provided with a sealing measure in the circumferential direction over the entire length of the sealing segment, i. is continued in the event of an interruption of the fastening profile on the side facing the rotor axis on the anchoring portion between the mutually circumferentially spaced fastening profiles.

In a first variant, this may be a sealing groove that opens to the rotor axis. In a second variant, a radially extending to the rotor axis sealing ridge is arranged on the mounting profile, which may be integrally formed on the mounting profile in a simple embodiment. In a third variant, a radially extending sealing web is used, which in this case is inserted in the radially opening sealing groove.

The sealing measure is advantageous in the case of a Christmas tree or dovetail profile to be arranged on at its rotor axis facing bottom. In the case of a C-shaped sealing profile in this case the sealing measure is advantageous to arrange in the middle of the interior of the sealing profile facing the rotor axis.

In order to support the sealing sections during rotation of the rotor, in particular when considering the required curved shape, it is furthermore particularly advantageous if the forces occurring on the adjacent rotor disks or on the rotor disks are applied via the support section Can support blades. For this purpose, the support section in a first variant on a radially outwardly facing support surface and transverse to an axially pointing from the middle of the segment centering. By the two surfaces thus a transfer of the compressive forces of the sealing portion and the centrifugal forces in the support portion on the support surface and the centering surface of the support portion on the rotor disc and / or blade is possible.

In an alternative variant, the support section has a curved support surface. This radially outwardly and axially arcuately curved support surface also permits radial and axial support and thus advantageous load transfer from the support section into the rotor disc and / or the blade, i. in particular the compressive stresses acting on the sealing sections.

In a third variant, it is particularly advantageous, in particular at constant rotational speeds of the rotor and thus constant centrifugal forces, when the support section has an inclined support surface. The inclination may be chosen here such that, when the sealing segment is used as intended in the operation of the rotor, the forces occurring in this case, i.e., in the direction of rotation of the rotor are eliminated. the pressure forces acting on the sealing sections as well as the centrifugal forces in the support section are transmitted essentially as pure compressive stresses via the support surface and, as far as possible, lateral forces are largely avoided in the support surface.

Depending on the selected type of mounting of the sealing segment on the rotor, it is necessary to perform the support section variously. It is particularly advantageous if the support section divided at least with the support surface in the circumferential direction in at least two parts. In this case, there is a recess between the parts of the support surface of the support portion, which advantageously allows mounting on the rotor.

An advantageous seal between the radially outwardly located region and the region below the sealing sections is further favored if a radially extending sealing strip is present in the support section. In this case, the sealing strip in the use of the sealing segment can rest on, for example, a rotor blade attached to the rotor disk, so that a further sealing from the sealing segment to the rotor blade is improved.

For receiving a sealing strip or a piston ring extending over several or the entire circumference for sealing the gap between the sealing segment and the blade, it is furthermore advantageous if a receiving groove opening in the circumferential direction and extending radially outwards is provided in the supporting section. In this case, the receiving groove on the top of the support portion, i. on the radially outward-facing side, be aligned axially within the support portion perpendicular to the rotor axis.

In a particularly advantageous manner, the pitch of the sealing segments coincides with the pitch of the adjacent moving blades, at least on one rotor disk, preferably the upstream rotor disk. The use of sealing strips having a matching circumferential length with the sealing segments and the blade platforms results in minimal load displacement of the blade platforms during loading. a tilting about an axis parallel to the rotor axis, to an undiminished complete concern of the sealing strips on the underside of the blade platforms. Thus, an optimal tightness is achieved.

Furthermore, the flow seal to a - in contrast to the rotor - stationary stator ring is improved when a sealing wing is arranged on the support portion, which is axially spaced in the middle of the segment from the support surface and in this case extends in the circumferential direction and radially.

Starting from the existing sealing segment according to the invention, the formation of a rotor according to the invention is possible, which is used in particular in a gas turbine, wherein the rotor has at least two rotor disks. The rotor disks each have a plurality of blade retaining grooves distributed in the circumference. Between the rotor discs is a plurality of sealing rings forming a sealing segments, wherein for attachment of the sealing segments with the mounting profile on the rotor, an annular receiving profile is present. To form the rotor according to the invention, sealing segments according to the previous description are used in this case.

It is particularly advantageous if the sealing segments and the rotor disks or the rotor is shaped such that form two separate annular spaces on both sides of the anchoring portion. In this respect, there is a first annular space between the first rotor disk and the sealing ring formed from sealing segments, in particular with the anchoring sections, and a second annular space between the sealing ring formed from sealing segments and the second rotor disk.

Depending on the installation of the fastening profile on the receiving profile, a more or less complete separation of the first annular space from the second annular space can be achieved. If the fastening profile has an interruption or other clearances are present, in particular for easier assembly, then it is particularly advantageous to provide further sealing measures in the connection between the fastening profile and the receiving profile.

For this purpose, in a first variant in or on the receiving profile, a circumferentially and radially outwardly extending sealing web can be provided, which is formed, for example, integrally with the receiving profile. In a second variant, a radially outwardly opening sealing groove is provided in the receiving profile. It is particularly advantageous in a third variant both in the fastening profile and to provide a sealing groove in the receiving profile, wherein a circumferentially and radially extending sealing ring dips into both opposing grooves. For advantageous sealing of the two spaces but it may also be sufficient to provide the sealing ring only in the sealing groove in the receiving profile, which migrates due to the centrifugal force during operation of the rotor at least minimally radially outwards and sealingly comes to rest on the mounting profile.

Furthermore, advantageously, the rotor in each case on the blade retaining grooves with blade roots mounted blades, which each have a circumferentially and axially extending blade platform.

To support the sealing segments further comprises a rotor disk or both rotor disks each between the blade retaining grooves on an axially ersteckenden mounting projection. In this case, it is provided that the support sections come into abutment with the support surfaces at least during the rotation of the rotor on the attachment projection and thus are supported directly on the respective rotor disk. Additionally or alternatively, it is also possible to provide the abutment of the support surfaces of the support sections on the blades on the blade root and / or the blade platform.

Furthermore, it is advantageous if a seal between the sealing segments and the blades takes place. For this purpose, the rotor blades have a collar extending from the blade platform and projecting beyond the rotor disk in the area of the blade retaining grooves. This collar can connect with minimal sealing gap to the support section. However, it is particularly preferred if the sealing strip in the support section applies at least during rotation of the rotor on the collar, so that an optimal seal between the sealing segment and blade is achieved.

The arrangement of the receiving profile for attachment of the sealing segments with the fastening profile can be carried out in many ways be. In this respect, it is possible, for example, to provide an encircling receiving profile or a plurality of axially running circumferentially arranged receiving profiles on an intermediate ring between the two rotor discs.

An embodiment is preferred in which at least one rotor disk has a connecting flange on the side facing the other rotor disk. Particularly preferably, both adjacent rotor disks each have a mutually facing connecting flange, wherein its size and shape can be chosen differently.

In a first embodiment, it is advantageously provided that the receiving profile is arranged on the connecting flange or on a connecting flange of one of the rotor disks.

Alternatively, it is also possible to realize the receiving profile in such a way that the two adjacent rotor disks, each with half facing each other, realize half of the receiving profile with one profile half, ie. that the two profile halves of the two adjacent connecting flanges together form the receiving profile, and thus allow the attachment of the sealing segments with the fastening profile.

For attachment of the sealing segments on the receiving profile, it is also particularly advantageous, in particular when the receiving profile in the circumferential direction, if at least one mounting space is available in the receiving profile. In which direction the mounting space extends, i. E. opens, is initially irrelevant, provided that the corresponding insertion of the sealing segment with the fastening profile in the mounting space and is subsequently made possible in the receiving profile on the rotor.

For this purpose, the mounting space, starting from the receiving profile in a radially outward-facing direction and / or extend in an axial direction. It is provided that the fastening profile is initially positioned in the radial direction at a radial opening of the mounting space or in the axial direction with a corresponding axial opening of the mounting space in corresponding radially and axially correct position with respect to the receiving profile, then by subsequent rotation, ie a shift in the circumferential direction, the sealing segment is inserted relative to the rotor disks, an insertion of the fastening profile in the receiving profile.

The advantages of the attachment of the sealing segments between two rotor discs lead at least with respect to the last sealing segment in the scope to form the sealing ring to the problem of mounting the sealing segment. To solve this problem, a novel assembly tool is proposed. Accordingly, this mounting tool is for use in a sealing segment, which has a respective support portion at the axial opposite ends. In this case, it is necessary for the respective support section to have a mounting recess which opens to the opposite support section. Accordingly, the support section with the mounting recess is radially undercut.

The assembly tool in this case has a first lever and a hingedly connected second lever. The first lever extends in the direction of a support portion, wherein at the end of the first lever, a first contact element is arranged. This engages in the corresponding mounting recess of the associated support section. The connected via a second lever extends in the direction of the other support portion and also has at its end a second contact element. Analog engages the second contact element in the associated mounting recess of the corresponding support portion. This represents the mounting position of the mounting tool.

Due to the articulated connection of the first lever with the second lever, it is possible to adjust these in a free position by pivoting the lever to each other, so that the contact elements have a smaller distance from each other. As a result, they can be moved in the free position between the support sections. That in the free position, the assembly tool can be brought to the sealing segment, or be removed after assembly. To adjust the lever to each other an actuating element is provided, which is mounted in extension of the second lever on opposite side to the joint. By bringing the actuating element to the first lever, the adjustment between the free position and the mounting position can be carried out in a simple manner. At the same time, the handling of the assembly tool with attached sealing segment can be carried out directly during the adjustment in the installation position.

FIG 1

ein erstes Ausführungsbeispiel für einen Rotor mit Dichtsegmenten in perspektivischer Ansicht im Halbschnitt;

FIG 2

die Ausführungsform aus FIG 1 unter Weglassung einer Rotorscheibe;

FIG 3

ein Dichtsegment zur Ausführung aus FIG 1;

FIG 4

eine Schnittdarstellung zur Ausführung aus FIG 1;

FIG 5

ein Detail des Dichtsegments aus FIG 4;

FIG 6

eine Schnittdarstellung analog FIG 4 mit einer alternativen Ausführungsform eines Dichtsegments;

FIG 7

ein Detail des Dichtsegments zur FIG 6;

FIG 8

ein weiteres Ausführungsbeispiel eines Dichtsegments in einer Darstellung analog FIG 4;

FIG 9

eine Detaildarstellung zur Ausführungsform des Dichtsegments aus FIG 8;

FIG 10

ein beispielhaftes Montagewerkzeug in der Montageposition am Dichtsegment;

FIG 11

das Montagewerkzeug aus FIG 10 in der Freiposition.

In the following figures, exemplary embodiments for sealing segments according to the invention and rotors are outlined. Show it:

FIG. 1

a first embodiment of a rotor with sealing segments in a perspective view in half section;

FIG. 2

the embodiment of FIG. 1 omitting a rotor disk;

FIG. 3

a sealing segment for execution FIG. 1 ;

FIG. 4

a sectional view of the execution FIG. 1 ;

FIG. 5

a detail of the sealing segment FIG. 4 ;

FIG. 6

a sectional view analog FIG. 4 with an alternative embodiment of a sealing segment;

FIG. 7

a detail of the sealing segment for FIG. 6 ;

FIG. 8

a further embodiment of a sealing segment in a representation analog FIG. 4 ;

FIG. 9

a detailed representation of the embodiment of the sealing segment FIG. 8 ;

FIG. 10

an exemplary assembly tool in the mounting position on the sealing segment;

FIG. 11

the assembly tool FIG. 10 in the free position.

In the FIG. 1 a first embodiment of a rotor according to the invention and a sealing segment according to the invention in a perspective view in half section is shown. Evident is the arrangement with two successive rotor disks 01, which 01 each distributed around the circumference have a plurality of blade retaining grooves 03. In the blade grooves 03 blades can be fixed with a corresponding blade root in a known manner. In this illustration, the connection between the two rotor disks 01 is shown simplified without a separation. However, it is provided that the two rotor disks 01 are manufactured separately and connected to each other via a mechanical connection. Furthermore, it can be seen that a connecting flange 05 is arranged between the rotor disks 01, which extends radially outward from a section connecting the rotor disks 01.

At the connecting web 05 a plurality of sealing segments 11 are distributed in the circumference. Furthermore, the sealing segments 11 adjoin the rotor disks 01 and the rotor blades to be mounted on both sides. In this way, advantageously, a first annulus 08 between the first rotor disk 01, the connecting flange 05 and the sealing segment 11 and opposite a second annulus 09 between the second rotor disk 01, the connecting flange 05 and formed the sealing segment 11. The closed annular spaces 08, 09 favor an advantageous cooling air flow in the rotor.

This shows again the FIG. 2 the view FIG. 1 omitting the front rotor disk 01. Accordingly, in FIG. 2 only the rear rotor disk 01 sketched. Recognizable in turn is the attachment of distributed circumferentially arranged sealing segments 11 with their respective attachment to the connecting flange 05. For this purpose, the connecting flange 05 know a circumferential mounting profile 06. In order to allow mounting of the sealing segments 11 on the fastening profile 06, a mounting space 07 is provided on the connecting flange 05, which interrupts the receiving profile 06. Thus, the sealing segment 11 can be mounted in a bayonet. Furthermore, it can be seen beginning on that the sealing segment 11 adjacent to each other on opposite sides of the rotor disk 01 adjacent to a mounting projection 04 of the rotor disk 01, so that in addition to the central attachment of the sealing segment 11 on the connecting flange 05 another system for load transfer to the mounting projection 04 of the rotor disk 01 takes place.

In the FIG. 3 Now, an exemplary embodiment of a sealing segment 11 is sketched in perspective view. Evident is its T-shaped shape with both sides of a segment center 12 extending sealing portions 15. The sealing portions 15 are here arcuate, so that when centrifugal forces occurring an advantageous stress distribution in the sealing segment 11 is achieved. At the middle of the segment 12 opposite end of the respective sealing portions 15 is located on both sides of the sealing segment 11 each have a support portion 17. The support portion 17 has a radially outwardly facing support surface 21 and an axially to the respective rotor disk 01 facing centering surface 23. In this embodiment, it is provided that the support surface 21 and the centering surface 23 are arranged in an L-shape.

In order to enable mounting of the sealing segment 11 on the respective rotor disk 01, it is further provided that the support surface 21 is interrupted over the length of the sealing segment 11 in the circumferential direction. Therefore, the support portions 17 in this embodiment each have two recesses 18, which correspond at least to the length of the mounting projections 04 in the circumferential direction. This also allows the bayonet-like mounting of the sealing segment 11 between the rotor disks 01. Furthermore, it can be seen in this embodiment, that the support portions 17 further comprise a spaced from the centering surface 13 in the direction of 12 center segment 12 sealing wings. This 19 favors the further seal to a stationary stator ring, which surrounds the sealing ring formed from sealing segments 11. Furthermore, the sealing segment 11 has a plurality of radially outwardly extending sealing ribs 16, which also favor 16 an advantageous seal against the stator ring. The support sections 17 each have a receiving groove 20 extending in the circumferential direction. It is provided that in the receiving groove 20, a sealing strip is inserted, which comes at least under centrifugal force under a collar of the respective blades to the plant and allows an advantageous seal to the blades.

The T-shaped sealing segment furthermore has an anchoring section 13 extending radially inwards from the middle of the segment 11. The attachment profile 14 is designed in this embodiment as a broadening of the anchoring portion 13, so that this 14 can be secured in a T-shaped receiving groove of the receiving profile 06 at its end opposite to the segment center 12. It is obvious that for this purpose the mounting space 07 at the receiving profile 06 of the connecting flange 05 must be made sufficiently large, so that the fastening profile 14 can be mounted in a bayonet.

In FIG. 4 is again for presentation FIG. 1 the arrangement of two adjacent rotor disks 01 sketched with intermediate sealing segment 11 in section. The rotor disks 01 can be seen with the connecting web 05 and the sealing segment 11 located therebetween. The sealing segment 11 is mounted here with the fastening profile 14 in the receiving profile 06 on the connecting flange 05. To enable the assembly of the sealing segment 11, the receiving profile 06 at the appropriate place a mounting space 07, so that the mounting profile 14 can be inserted from above first into the mounting space 07 and then into the receiving profile 06. The rotor disks 01 further have at their radially outer end on the mutually facing sides in each case a fastening projection 04, on which the T-shaped sealing segment 11 also comes to rest.

This is shown in a detail view in FIG. 5 the support portion 17 of the sealing segment 11 outlined. To recognize is in turn the end of the sealing portion 15 to which the support portion 17 connects. The support portion 17 in this case has radially outwardly facing a support surface 21 for support on the mounting projection 04. Furthermore, the support portion 17, the centering surface 23 also to rest on the mounting projection 04. Spaced to the centering surface 23 is located on the support portion 17, a sealing wing 19 and immediately adjacent to the centering surface 23 a receiving groove 20th

In the following FIG. 6 is an alternative embodiment of a sealing segment 41 and the embodiment of the rotor disks 31 analogous to the representation in FIG. 4 sketched on average. In turn, the adjacent arrangement of the rotor disks 31 can be seen with a connecting flange 35 lying between them. In this exemplary embodiment it is provided that the connecting flange 35 is divided in the middle and thus formed by two halves 35a and 35b respectively belonging to one of the two rotor disks 31 , At the end of the connecting flange 35 closes analogous previous Execution, the receiving profile 36, wherein in this embodiment, the receiving profile 36 is formed according to the separation of the rotor discs 31 of two halves 36 a and 36 b and in this case represents a T-shaped configuration with the anchoring portion 35. At the radially outer end of the rotor disks 31 are analogous to the mounting projections 34. In contrast to the previous embodiment in FIG. 4 is provided in this embodiment of the sealing segment 41 that this at the end of the anchoring portion 13 has a C-shaped mounting profile 44 which engages around the T-shaped receiving profile 36. In this respect, this embodiment turns out to be a reversal of the example FIG. 4 Furthermore, it is provided in deviation from the previous embodiment in this embodiment that the support portion 47, as in FIG. 7 shown in detail, the associated centering surface 53 comes directly to the end face of the respective rotor disk 31 to the plant and insofar an axial clearance for mounting projection 34 of the rotor disks 31 is present. The support of the centrifugal forces is analogous to the previous embodiment on the radially outwardly facing support surface 51st

In FIG. 8 Another embodiment is analogous to the representation FIG. 4 outlined. In this variant is different from the execution FIG. 4 provided that between the mounting profile 74 and the connecting flange 65, a sealing strip 27 is arranged. For this purpose, the receiving profile 66 on the connecting flange 55 has a radially outwardly facing sealing groove 67 into which the annular sealing strip 27 is inserted. This 27 may be performed circumferentially. For advantageous sealing, the fastening profile 74 analogously has a sealing groove 84 in the sealing strip 27 engages.

Furthermore, in this embodiment - see in particular FIG. 9 - Two other design options for the design of the support sections 77, 78 outlined. Accordingly, no longer separate support and centering surfaces are provided, but rather a support surface 81, 82, 81, 82 can support both radially and axially on the correspondingly executed fastening projection 64,68.

A first solution provides in this case that the support surface 81 of the support portion 77 is curved. Insofar as the shape of the support surface 81 corresponds in section to a circular section in an advantageous manner, a planar contact of the support section 77 on the fastening projection 64 is ensured even in the case of deformations of the sealing section 15.

A second solution for this purpose discloses a support portion 78 with a support surface 82 inclined and correspondingly designed Befestigungsvorsprung 68. The inclination of the support surface 82 is in this case selected such that during normal operation of the rotor with the centrifugal forces occurring taking into account the axial and radial forces essentially only compressive forces on the inclined support surface 82 are transferred to the mounting projection 68.

In the FIG. 10 Now, an exemplary mounting tool 101 is shown schematically in a mounting position on the sealing segment 11. To recognize is in turn the sealing segment 11 from the Figures 1-5 , The support portions 17 at the end of the sealing portions 15 each have a facing the opposite support portion 17 mounting recess, which is radially undercut. The assembly tool 101 comprises a first lever 103, which extends substantially axially to one of the support sections 17 and at the end of which a first receiving element 104 is located. This 104 engages in the mounting recess on the corresponding support portion 17. Opposite at the end of the first lever 103 is a hinge 107 to which a second lever 105 is pivotally mounted. This 105 extends analogously in the opposite direction to the other support portion 17. In the corresponding mounting recess engages a second contact element 106 at the end of the second lever 105 a. The Mounting position shown here is made possible by the movement of an actuating element 108 which is connected to the second lever 105 108 opposite to the hinge 107. When gripping the actuating element 108 with the first lever 103, the sealing segment can be moved with the assembly tool.

If the actuating element 108 is released, the assembly tool 101 can be removed from the sealing segment 11 by pivoting the second lever 105 relative to the first lever 103.

Claims (24)

Sealing segment (11, 41, 71) for forming a sealing ring of a rotor, in particular a gas turbine, with a central, circumferentially and radially extending anchoring section (13), which (13) has a fastening profile (14, 44, 14) on the side facing the rotor axis 74) and at the outwardly facing end has a segment center (12), and with circumferentially substantially from the middle segment (12) axially laterally extending first and second sealing portions (15) and with the respective sealing portions (15) subsequent first and second support sections (17,47,77,78),
characterized,
that the sealing portions (15) at least in sections between the middle segment (12) and support portion (17,47,77,78) have a curved shape to the rotor axis. Sealing segment (11,41,71) according to claim 1,
characterized,
that the sealing portions (15), and in particular of the anchoring portion (13), a portion of a body of rotation, respectively. Sealing segment (11,41,71) according to claim 1 or 2,
characterized,
in that the two ends of the sealing sections (15) and of the anchoring section (13) lie in the circumferential direction in each case essentially in one plane with the rotor axis. Sealing segment (11,41,71) according to one of claims 1 to 3,
characterized,
that the shape of the sealing portions (15) is selected such that centrifugal forces lead to compressive stresses at least in the direction of the support portions (17,47,77,78) and optionally to the segment center (12). Sealing segment (11,41,71) according to one of claims 1 to 4,
characterized,
that the distance of the sealing portions (15) to the rotor axis continuously decreases, starting from the middle of the segment (12) and then increases again up to the support portions (17,47,77,78); or
that the distance of the sealing portions (15) to the rotor axis in the middle of the segment (12) is the lowest and increases continuously up to the support portions (17,47,77,78). Sealing segment (11,41,71) according to one of claims 1 to 5,
characterized,
that on the outwardly facing side of the sealing portions (15) sealing ribs (16), in particular for forming a labyrinth seal, are arranged. Sealing segment (11,41,71) according to one of claims 1 to 6,
characterized,
in that the fastening profile (14, 44, 74) extends in the circumferential direction, wherein in particular at least two fastening profiles (14, 44, 74) which are spaced apart from each other in the circumferential direction are present. Sealing segment (11,71) according to one of claims 1 to 7,
characterized,
that the fastening profile (14,74) having a fir-tree or dovetail profile or the like. Sealing segment (41) according to one of claims 1 to 8,
characterized,
that the fastening profile (44) is C-shaped and forms a Christmas tree or dovetail groove or the like. Sealing segment (71) according to one of claims 1 to 9,
characterized,
that in or on the fastening profile (74) is arranged a radially and circumferentially extending sealing web (27); and or
in that a sealing groove (84) extending in the circumferential direction and opening radially inward is arranged in the fastening profile (74), wherein in particular the sealing web (27) is arranged in the sealing groove (84). Sealing segment (11,41,71) according to one of claims 1 to 10,
characterized,
that the support portion (17,47) has a radially outwardly facing support surface (21,51) and an axially from the center of the segment (12) facing away from centering surface (23,53); or
that the support portion (77) has a curved support surface (81), which (81) allows radial and axial support; or
in that the support section (78) has an inclined support surface (82), wherein the inclination is selected such that essentially only compressive stresses are transmitted during intended use and the forces occurring in this case. Sealing segment (11,41,71) according to one of claims 1 to 11,
characterized,
in that the support section (17, 17, 77, 78) has at least one recess (18) which (18) divides the support surface (21, 51, 81, 82) in the circumferential direction into at least two parts. Sealing segment (11,41,71) according to one of claims 1 to 12,
characterized,
that in the support portion (17,47,77,78) a radially extending sealing strip is inserted; and or
in that a radially extending sealing wing (19) which is axially spaced from the support surface (21, 51, 81, 82) is arranged on the support section (17, 27, 77, 78). Rotor, in particular for a gas turbine, having at least two rotor disks (01, 31, 61, 62) which (01, 31, 61, 62) have a plurality of blade retaining grooves (03) distributed in the circumference, and with a plurality of a sealing ring forming sealing segments (21,61,81), wherein in the rotor an annular receiving profile (06,36,66) is present, on which (06,36,66) the sealing segments (11,41,71) are fastened with the fastening profiles (14, 44, 74),
marked by
an embodiment of the sealing segments (11,41,71) each according to one of the preceding claims. Rotor according to claim 14,
characterized,
Sealing ring formed that between a first rotor disc (01,31,61) and the sealing of the segments (11,41,71), a first annular space (08) and between a second rotor disc (01,31,62) and the sealing ring is a separate second Annular space (09) is present. Rotor according to claim 15,
characterized,
that in or on the receiving profile (66) a radially and circumferentially extending sealing web (27) is arranged; and or
in that a sealing groove (84) extending in the circumferential direction and opening radially outwards is arranged in the receiving profile (66), wherein in particular the sealing web (27) is arranged in the sealing groove (84). Rotor according to one of claims 14 to 16,
marked by
Blades which are mounted in the blade holding grooves (03) with blade roots and which have a blade platform which adjoins in the circumferential direction and in an axially extending manner at the blade roots. Rotor according to one of claims 14 to 17,
characterized,
in that one or both rotor disks (01, 31, 61) each have an axially extending between the blade retaining grooves (03) Mounting projection (04,34,64,68), wherein the support portion (17,47,77,78) at least during rotation of the rotor on the mounting projection (04,34,64,68) comes into contact. Rotor according to one of claims 14 to 18,
characterized,
in that a sealing gap is formed between a collar of the blade platform projecting beyond the rotor disk (01, 31, 61, 62) and the support section (17, 17, 77, 78); and / or that the sealing strip, at least during rotation of the rotor, rests against a collar of the blade platform protruding beyond the rotor disk (01, 31, 61, 62). Rotor according to one of claims 14 to 19,
characterized,
in that at least one rotor disk (01, 61, 62) has a connecting flange (05, 65) on the side facing the other rotor disk (01, 61, 62), on which (53, 56) the receiving profile (06, 66) is arranged , Rotor according to one of claims 14 to 20,
characterized,
in that the rotor disks (31) each have a connecting flange (35a, 35b) pointing towards one another, wherein the receiving profile (36) comprises two profile halves (36a, 36b), which (36a, 36b) are respectively arranged on a connecting flange (35a, 35b) , Rotor according to one of claims 14 to 21,
characterized,
in that at least one assembly space (07) is present in the receiving profile (06, 36, 66), which (07) inserts the sealing segment (11, 41, 71), in particular in the radial direction, with subsequent circumferential displacement of the sealing segment (11, 41, 71) relative to the rotor discs (01,41) allows. Assembly tool (101) for mounting a sealing segment (11,41,71) between two rotor discs (01,31,61), wherein the sealing segment (11,41,71) has at least one between the rotor discs (01,31,61) extending sealing portion (15) and to the each in the direction of the rotor axis opposite ends of the sealing segment (11,41,71) is arranged in each case a support portion (17,47,77,78), wherein each support portion (17,47,77,78) at least one radially undercut to the opposite Support portion (17,47,77,78) has an opening mounting recess, comprising a to a support portion (17,47,78) extending first lever (103) having a arranged at the end of the first contact element (104) and one to the other support portion (17,47,77) extending second lever (105) having a second abutment element (106) arranged at its end, wherein the first lever (103) with the second lever (105) via a hinge (107) is pivotally connected and by means of an actuating element (108) between a Mo ntageposition and a free position is adjustable, wherein the contact elements (104,106) in the free position between the support portions (17,47,77,78) can be moved and engage in the mounting position in the associated mounting recesses. Assembly tool (101) according to claim 23,
characterized in use for a sealing segment (11, 41, 71) according to any one of claims 1 to 13.

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