WO2016134864A1

WO2016134864A1 - Wheel disk assembly having simplified sealing-plate mounting

Info

Publication number: WO2016134864A1
Application number: PCT/EP2016/050343
Authority: WO
Inventors: Harald Hoell; Kevin KAMPKA; Karsten Kolk; Marc Lange; Peter Schröder; Vyacheslav Veitsman
Original assignee: Siemens Aktiengesellschaft
Priority date: 2015-02-24
Filing date: 2016-01-11
Publication date: 2016-09-01
Also published as: EP3227532A1; EP3061916A1; US20180023401A1; JP2018508699A; JP6463848B2; CN107407155A

Abstract

The invention relates to a wheel disk assembly (1), comprising a wheel disk (2), a plurality of blade devices (3), which are fastened along the outer circumference of the wheel disk (2), and a plurality of sealing plates (5), which are retained in two annular grooves (6, 7) radially spaced apart from each other. A first annular groove (6) is in the wheel disk (2) and a second annular groove is formed by the blade devices (3) in a segmented manner. Simplified mounting of the sealing plates is achieved in that the first annular groove (6) is expanded by an axially extending recess (13).

Description

description

Wheel disc arrangement with simplified sealing plate assembly

The present invention relates to a wheel disc assembly having a wheel disc and a plurality of attached to the wheel disc blade means and a plurality of the

Wheel disc in a ring groove fixed sealing plates according to the preamble of claim 1.

Radscheibenanordnungen of the type mentioned are known in the prior art in a variety of configurations, in the usual embodiment, a wheel disc on the outer circumference has a plurality extending in the direction of the disk axis Schaufelfußaufnahmenuten. In this vane means are arranged with the blade root. For frontal cover of Schaufelfußaufnahmenuten sealing plates are used, which this purpose usually in

Ring grooves are stored. A typical example of this disclosed GB 905,582 A. Here, the wheel disc has a circumferential outwardly open inner annular groove in which an axis pointing to the disc axis end of the sealing plate is axially fixed. At the opposite outer end of the

Sealing plate is an inwardly open outer annular groove available. The outer annular groove is formed by the circumferentially adjacent vane means.

During assembly, the blade devices are inserted into the Schaufelfußaufnahmenuten the wheel disc, wherein successively, the sealing plates between the two annular grooves are inserted. To the last two

To be able to install bucket devices, all the sealing plates must already have been previously mounted and shifted so far beyond their overlapping areas in the annular grooves that the bucket devices can be installed in the assigned grooves of the wheel disc. Subsequently, the sealing plates in the circumferential direction back into their pushed appropriate position and there against a

Move in the circumferential direction suitable secured.

A disadvantage of the known Radscheibenanordnungen is that the sealing plates difficult to dismantle in case of service, since initially two adjacent

Bucket devices must be removed, which is associated with a considerable effort in practice. Based on this prior art, it is an object of the present invention to provide a Radscheibenanordnung of the aforementioned type, in which a greater flexibility in terms of the assembly of the sealing plates is achieved.

The generic wheel disc assembly comprises a

Wheel disc, a plurality of blade means and a plurality of sealing plates. The wheel disk in this case has a blade receiving portion arranged on the outer circumference. At this the vane devices are distributed releasably distributed in the scope. Furthermore, the wheel disc axially spaced from the blade receiving portion has an annular projection. Between the blade receiving portion and the

Ring projection is arranged an annular groove. In this annular groove, the sealing plates are facing with a disc axis

Bearing area stored and fixed by the blade receiving portion and the annular projection in the axial direction. The

Disc axis corresponds to the obvious centric

Rotary axis of the rotor disk. The edge region of the sealing plates adjoins the end of the sealing plates facing the disk axis and extends radially in the height corresponding to its arrangement in the annular groove.

To achieve the object, the invention provides that the annular groove is widened by at least one recess defining a sealing plate mounting area in the axial direction. In this respect, the depression extends from the annular groove in the axial direction in the blade receiving portion and / or into the annular projection. Here it is

required that the length of the recess in

Circumferential direction is greater than the length of the sealing plates in the edge region.

Thanks to such a recess, the sealing plates in a simple manner in the associated annular grooves

be threaded, even if already all

Bucket devices are mounted on the wheel disc, whereby the assembly is made very flexible. Here, the sealing plates with the edge region, for example, obliquely inserted from above into the recess and then tilt the sealing plate in the direction of the wheel disc.

Then, the sealing plate can be moved in the circumferential direction along the annular groove. Just as easily can the

Remove individual sealing sheets in reverse order.

Basically, it is initially irrelevant whether the annular groove is segmented and / or executed interrupted, unless the interrupted areas for attaching a

Sealing plate are required. In both simple and particularly advantageous embodiment, the annular groove is in

Cross section - apart from the depression - consistently running around.

According to one embodiment of the present invention, all sealing plates are identically designed as identical parts, whereby the production and storage of the sealing plates are simplified.

It is particularly advantageous if the depression continues to extend in the radial direction to the disc axis pointing. That that the depression over a limited length, the cross section of the annular groove in the axial and in the radial

Direction enlarged. By existing both in the axial direction and in the radial direction enlargement through the depression an advantageous space for mounting the sealing plates is created with its edge region. In particular, it is possible, the sealing plates first in the recess in such a way

insert that closer to the disc axis

are positioned as it corresponds to the end position.

Subsequently, the sealing plates can be moved outward in the radial direction and thus be moved to the end position.

Advantageously, the annular projection on the side facing the annular groove in the region of the depression on a slope, wherein the slope is formed so that the annular projection flattening toward the annular groove out. Such a slope also simplifies the insertion and removal of the sealing plates in the region of the recess.

According to one embodiment of the present invention, the annular projection on the side facing the annular groove in the region of the depression has an undercut region in the form of a recess which opens toward the annular groove.

Advantageously, two recesses are provided, which are formed diametrically opposite in the wheel disc. Thanks to a second recess can during the

Proper use of the wheel disc assembly

Unbalance can be avoided. Furthermore, the sealing plates can be assembled and disassembled faster. Also conceivable is the arrangement of a plurality of depressions, which

rotationally symmetrical to the disc axis over the circumference

distribute.

According to one embodiment of the present invention, the annular groove is formed undercut and, viewed in cross-section, has at least one axially in the direction of the

Sealing plate protruding holding projection on. Accordingly, the retaining projection is either on Schaufelaufnahmeabschitt and / or on the annular projection and is disposed radially outside of the annular groove. In this case, the holding projection on the side facing the annular groove, ie the disc axis, a holding surface. It is first

irrelevant whether one-sided or bilateral holding projections are provided and whether a holding surface or more

Holding surfaces on the retaining projection are present. Either

sufficiently and advantageously simple is the embodiment with a circumferential along the annular groove retaining projection with a holding surface arranged thereon. Corresponding to this, the sealing plates in the edge region at least one axially projecting support projection, which with a

Tragfläche is provided. Thus, the edge region with the supporting projection presents as a thickening to the radially outwardly of the edge region lying region of the sealing plate.

The holding surface of the holding projection and the supporting surface of the supporting projection are arranged such that the

Support surfaces of the sealing plates during normal operation of the Radscheibenanordnung under the action of a centrifugal force against the retaining surface of the retaining projection

support. Thanks to this configuration, the weight of the sealing sheets is absorbed by the wheel disc under the action of centrifugal force, whereby the blade means are relieved.

Preferably, at least one filler is provided, which is arranged in the recess. Through the filler, it is possible unintentional slipping out of the annular groove or a partial deformation of the sealing plate at a

Position, in which the sealing plate is arranged over a portion of the length in the region of the recess to prevent. For this it is necessary that the filler is applied to the sealing plate.

It is on the one hand advantageous if the filler with a radially extending contact surface axially on

Edge region of the sealing plate rests. Thus, also in the Area of the recess ensures the axial fixation of the sealing plate.

Furthermore, it is advantageous if the filler has an axially extending radially outwardly facing contact surface on which the sealing plate with an inner circumference

is applied. Accordingly, the sealing plate can be supported in the region of the depression on the filling piece and, in particular, in the case of a recess extending radially into the wheel disk, not shift to the disk axis, for example when the disk arrangement is at a standstill.

Advantageously, the filler is designed such that an existing bevel is filled on the annular projection. As a result, on the one hand imbalances by otherwise

one-sided existing material gaps prevented and in particular a better support of the filler is given in an axial load through the sealing plate.

Moreover, it is advantageous if the filler protrudes into existing opening for recess recess in this. Due to the undercut execution in this area through the recess, the radial

Fixation of the filler can be achieved. In a particularly advantageous embodiment, the

Blade devices in each case a sectionally around the disc axis encircling radially to the disc axis opening towards the annular groove segment. It is provided that the sealing plates are accommodated on the outer circumference in the Ringnutsegmenten and thereby fixed in the axial direction. It is irrelevant whether there are more contours on the sealing plate, which are axially adjacent to the here

considered outer circumference are arranged. Decisive is rather a backup of the position of the sealing plate on

Outer circumference in the direction of the disc axis.

Taking into account the advantageous well extending radially into the wheel disc, this leads to a Assembly in which the sealing disc is first lowered down into the depression and is moved radially outwardly after a pivoting or a pushing on the wheel disc. In this case, then the insertion of the sealing plate with the outer circumference in the ring segments. It is irrelevant whether a respective sealing plate is received in a ring segment or whether the sealing plates are advantageously arranged overlapping to the blade means and insofar in

engage adjacent Ringnutsegmente.

Advantageously, the sealing plates each have one

Circumferential displacement on the corresponding sealing plate during the intended use of the

Wheel disc assembly holds in the intended position, so prevents a shift in the circumferential direction.

According to one embodiment of the present invention, the sealing plates have a bore and the wheel disc associated openings, which extend through the holes extending connecting elements in the associated openings and are advantageously attached to the sealing plates. Thanks to the fixing of the fasteners to the

Sealing plates an unnecessary weakening of the wheel by notch effect or the like is prevented.

Advantageously, the opening in the form of a radially

extending elongated holes formed. Accordingly, the sealing plates can move radially outward during the intended use of the Radscheibenanordnung under the action of a centrifugal force.

According to one embodiment of the invention, a plurality of the edges and corners of the first annular groove and / or the

Tragvorsprünge and / or the filler provided with radii. By such radii is a weakening of the

corresponding component by notch effect avoided. Furthermore, the present invention provides a method for mounting a wheel disc assembly according to the invention, in which in a first step, all blade devices are attached to the wheel disc, and in another

Step the sealing plates are mounted.

Further features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings.

They show in an exemplary embodiment of a

Wheel disc arrangement according to the invention:

Figure 1 is a perspective view of a

Radscheibenanordnung;

Figure 2 is a perspective view of the wheel in the

Area of depression; Figure 3 shows a cross section through the wheel disc in the region of the recess;

Figure 4 is a view analogous to FIG. 2 with inserted

Sealing plate;

Figure 5 is an enlarged perspective sectional view

through the recess with sealing plate and

inserted filler; FIG. 6 shows a cross section for the embodiment from FIG. 5,

Figure 7 is a side view of the filler for Fig. 5;

FIG. 8 is a perspective view of FIG. 5;

FIG. 9 shows a perspective sectional view analogous to FIG.

5 with an alternative embodiment of the recess and the filler. Figures 1 to 8 show a wheel disc assembly 1 and its components according to a first embodiment of the present invention. The wheel disc assembly 1 comprises a wheel disc 2, a plurality of blade means 3 fixed along the outer circumference to a blade receiving portion 24 of the wheel disc 2 in associated axially extending blade root receiving grooves 4, and a plurality

Sealing plates 5, between the wheel disc 2 and the

Blade means 3 in radially spaced annular groove and annular groove segments 6, 7 are held. The annular groove 6 is provided in the wheel disc 2 and is bounded axially outwardly by a continuous annular projection 8. Opposite is formed in each of the vane devices 3, a Ringnutsegment 7.

The measures provided for in the wheel disc 2 annular groove 6 is

formed undercut and has in cross section

considers an axially projecting retaining projection 9, 9 is provided with a holding surface 10. Similarly, the sealing plates 5 in a peripheral region on the inner diameter in cross-section, a corresponding to the

Retaining projection 9 formed, axially projecting

Supporting projection 11, which is provided with a wing 12 11.

To facilitate the assembly of the sealing plates 5 are on the annular groove 6 two diametrically opposed,

identically trained and one each

Sealing plate receiving portion defining recesses 13 arranged (of which 13 in the figures, only one recess 13 is shown). The length of the recess 13 in

Circumferential direction is greater than the width of the sealing plates in the recorded in the annular groove 6 edge region. The recess 13 extends in the axial direction and widening the

Ring groove 6. The annular projection 8 has on the first

Ring groove 6 facing side in the region of the recess 13 a Bevel 14, the 14 is formed such that the

Ring projection 8 flattening towards the annular groove 6 out.

The wheel disc assembly 1 further comprises a filling piece 15, which is designed such that it fills the area widened in relation to the annular groove 6 by the recess 13 as well as the area of the slope 14. Furthermore, the filler 15 has an axially facing away from the annular projection 8 projection 16 which extends below a

Sealing plate extends and thus defines an axially extending contact surface, which is for receiving a

Inner peripheral edge of at least one sealing plate 5 is used.

The also radially in the wheel disc 2 into it

extending recess 13 interrupts the otherwise

circumferential to the support for the sealing sheets 5 present

Due to the axial contact surface a substantially flush support for the sealing plates 5 in the region of the recess 13 is created. The sealing plates 5 are each formed identically and each include a bore 17 through which 17 in the intended mounted state of the Radscheibenanordnung 1 is a substantially pin-shaped

Connecting element 18 extends, the 18 at the assigned

Sealing plate 5 is fixed and in a formed on the wheel disc 2 opening 19 in the form of a radially

extending long hole attacks.

During assembly of the wheel disc assembly 1, all blade devices 3 are mounted on the wheel disc 2 in a first step. In a further step, the sealing plates 5 are successively installed. For this purpose, each sealing plate 5 with its edge region from above into the

Inserted recess 13 and then tilted in the direction of the wheel disc 2. Thereafter, the sealing sheet 5 can move upwards, i. radially outward, moved, then inserted with its outer peripheral edge in the Ringnutsegmente 7 and then in

Circumferential direction between the annular groove 6 and the Ring groove segments 7 are guided guided. Here, the individual sealing plates 5 are first in the circumferential direction in

Overlapping areas pushed over each other, so that even after the assembly of the last sealing plate 5 by

Well 13 defined sealing plate mounting area remains free. In a further step, the filler 15 is then inserted into the recess 13. Subsequently, each of the adjacent to the recess 13 arranged sealing plates 5 are pushed towards each other in the circumferential direction, so that they each rest in half on the projection 16 of the filler 15. Now, the filler 15 through the

resting sealing plates 5 secured against accidental release. In a further step, the

Connecting elements 19 pushed through the holes 17 of the sealing plates 5, so that the connecting elements 19 with the associated openings 18 which are respectively positioned in alignment with the holes 17, come into engagement.

Subsequently, the connecting elements 19 to the

Sealing plates 5 set, for example caulked. Now, the sealing plates 5 are secured against accidental displacement in the circumferential direction.

During normal operation of the

Wheel disc arrangement acts on the sealing plates 5 a

Centrifugal force that causes the sealing plates 5 to move radially outward, wherein the connecting elements 19 are guided within the associated openings 18. The radial outward movement of the sealing plates 5 is limited by the formed on the sealing plates 5 supporting projections 11 as soon as the wings 12 of the support projections 11 to the

Retaining surfaces 10 of the retaining projections 9 of the wheel disc 2 come to rest. In this state, then the wheel disc 2 takes on the forces caused by the weight of the sealing plates 5 forces.

A significant advantage of the previously described

Radscheibenanordnung 1 is that the sealing plates 5 thanks to the recesses 13 in a simple manner in the assigned annular grooves 6, 7 can be threaded, even if all the blade devices 3 at the

Wheel disc 2 are mounted, making the assembly is very flexible. The sealing plates can just as easily be dismantled. Another advantage is that forces caused by the centrifugal force of the self-weight of the sealing plates 5, are absorbed by the wheel disc 2 thanks to the provided on the wheel disc 2 holding projection 9 and formed on the sealing plates 5 supporting projections 11, whereby the

Blades 3 during operation of the

Radscheibenanordnung 1 are greatly relieved.

FIG. 9 shows an alternative embodiment of a depression 20 and a filler piece inserted into the recess 20

21. The recess 20 differs from the sketched recess 13 in that the annular projection on the side facing the annular groove 6 in the region of the depression 20 has an undercut region with a recess 20 opening towards the recess 22. The filler 21 is different from the filler 15 in that it also includes the undercut region, i. the

Recess 22 fills, and that in contrast to the filler 15 no pointing away from the annular projection projection 16 is provided, on which the sealing plates 5 rest. in the

Otherwise, the same is shown in FIG

Embodiment of the wheel disc assembly 1 described above, for which reason the same components or components are designated by the same reference numerals.

Although the invention in detail by the preferred

The invention has not been limited by the disclosed examples and other variations can be deduced therefrom by the person skilled in the art without departing from the scope of the present invention

To leave invention.

Claims

claims

Wheel disc arrangement (1) with a wheel disc (2) which (2) has a blade receiving portion (24) and at least one axially spaced annular projection (8) and at least one between the blade receiving portion (24) and the annular projection (8) arranged annular groove (6) and with a plurality of blade devices (3), which (3) distributed in the circumference on

Shovel receiving portion (24) are fixed, and with a plurality of sealing plates (5), which (5) with the

Disc axis facing edge region in the annular groove (6) are fixed in the axial direction,

marked by

a recess (13, 20), which (13, 20) extending from the annular groove (6) in the axial direction in the

Blade receiving portion (24) and / or in the

Ring projection (8) extends and whose length in

Circumferential direction corresponds at least to the length of the edge region of the sealing plates (5).

Wheel disc arrangement (1) according to claim 1,

characterized,

in that the recess (13, 20) continues to extend from the annular groove (6) towards the disk axis.

Wheel disc arrangement (1) according to claim 1 or 2,

characterized,

the annular projection (8) has a bevel (14) sloping down towards the depression (13, 20).

Wheel disc arrangement (1) according to one of claims 1 to 3,

characterized,

the annular projection (8) has a recess (22) which opens towards the depression (20). Wheel disc arrangement (1) according to one of claims 1 to 4,

characterized,

two or more depressions (13, 20) arranged rotationally symmetrically with respect to the disk axis are present.

Wheel disc arrangement according to one of claims 1 to 5, characterized

that the blade receiving portion (24) and / or the annular projection (8) has a holding projection (9) extending axially outside the annular groove (6) and extending axially relative to the sealing plate (5), with a holding surface (10) facing the annular groove (6), and that the sealing plate (5) on at least one side a protruding

Supporting projection (11) with a radially outwardly facing support surface (12)), wherein the support surface (12) at least in a force acting on the sealing plate (5) centrifugal force on the support surface (10).

Wheel disc arrangement (1) according to one of claims 1 to 6,

marked by

a in the recess (13) arranged in sections extending in the circumferential direction on the sealing plate (5) fitting filler (15, 21).

Wheel disc arrangement (1) according to claim 7,

characterized,

that the filler (15) with a radially

extending contact surface and / or with an axially extending contact surface on the sealing plate (5).

Wheel disc arrangement (1) according to claim 7 or 8,

characterized,

the filler piece (15 projects into the bevel (14) and / or into the recess (22). Wheel disc arrangement according to one of claims 1 to 8, characterized

in that the blade devices (3) each have an annular groove segment (7) which opens radially towards the disk axis, the sealing plates (6) being fixed in the axial direction at their outer circumference in the annular groove segments (7).

11. wheel disc arrangement (1) according to one of claims 1 to 10,

characterized,

that at least one, in particular all, sealing plate (5) by means of a circumferential displacement in

Circumference is secured.

12. wheel disc arrangement (1) according to claim 11,

characterized,

at least one, in particular all, sealing plate (5) for securing in the circumferential direction a bore (17) and the wheel disc (2) has an associated opening (19), wherein a connecting element (18) through the bore (17) into the opening ( 19) engages.