U.S. patent application number 15/546464 was filed with the patent office on 2018-01-25 for wheel disk assembly having simplified sealing-plate mounting.
This patent application is currently assigned to Siemens Aktiengesellschaft. The applicant listed for this patent is Siemens Aktiengesellschaft. Invention is credited to Harald Hoell, Kevin Kampka, Karsten Kolk, Marc Lange, Peter Schroder, Vyacheslav Veitsman.
Application Number | 20180023401 15/546464 |
Document ID | / |
Family ID | 52574066 |
Filed Date | 2018-01-25 |
United States Patent
Application |
20180023401 |
Kind Code |
A1 |
Hoell; Harald ; et
al. |
January 25, 2018 |
WHEEL DISK ASSEMBLY HAVING SIMPLIFIED SEALING-PLATE MOUNTING
Abstract
A wheel disk assembly, having a wheel disk, a plurality of blade
devices, which are fastened along the outer circumference of the
wheel disk, and a plurality of sealing plates, which are retained
in two annular grooves radially spaced apart from each other. A
first annular groove is in the wheel disk and a second annular
groove is formed by the blade devices in a segmented manner.
Simplified mounting of the sealing plates is achieved in that the
first annular groove is expanded by an axially extending
recess.
Inventors: |
Hoell; Harald;
(Wachtersbach, DE) ; Kampka; Kevin; (Mulheim a.d.
Ruhr, DE) ; Kolk; Karsten; (Mulheim a.d. Ruhr,
DE) ; Lange; Marc; (Koln, DE) ; Schroder;
Peter; (Essen, DE) ; Veitsman; Vyacheslav;
(Gelsenkirchen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Siemens Aktiengesellschaft |
Munich |
|
DE |
|
|
Assignee: |
Siemens Aktiengesellschaft
Munich
DE
|
Family ID: |
52574066 |
Appl. No.: |
15/546464 |
Filed: |
January 11, 2016 |
PCT Filed: |
January 11, 2016 |
PCT NO: |
PCT/EP2016/050343 |
371 Date: |
July 26, 2017 |
Current U.S.
Class: |
416/220R |
Current CPC
Class: |
F01D 5/3015 20130101;
F01D 5/02 20130101; F01D 11/006 20130101; F01D 5/326 20130101; F05D
2240/30 20130101; F05D 2260/31 20130101; F05D 2230/70 20130101;
F05D 2260/30 20130101; F05D 2230/60 20130101 |
International
Class: |
F01D 5/30 20060101
F01D005/30; F01D 5/32 20060101 F01D005/32 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 24, 2015 |
EP |
15156321.0 |
Claims
1. A wheel disk assembly comprising: a wheel disk which has a
blade-locating region and at least one annular projection spaced
apart in the axial direction and at least one annular slot which is
arranged between the blade-locating section and the annular
projection, and with a plurality of blade devices which blade
devices are fastened on the blade-locating section in a
circumferentially distributed manner, and with a plurality of
sealing plates which sealing plates, by the edge region pointing
toward the disk axis, are fixed in the annular slot in the axial
direction, and a recess which recess extends from the annular slot
in the axial direction into the blade-locating section and/or into
the annular projection and the length of which in the
circumferential direction corresponds at least to the length of the
edge region of the sealing plates.
2. The wheel disk assembly as claimed in claim 1, wherein the
recess furthermore extends from the annular slot pointing toward
the disk axis.
3. The wheel disk assembly as claimed in claim 1, wherein the
annular projection has a bevel sloping toward the recess.
4. The wheel disk assembly as claimed in claim 1, wherein the
annular projection has a cavity which opens toward the recess.
5. The wheel disk assembly as claimed in claim 1, wherein provision
is made for two or more recesses which are arranged rotationally
symmetrically to the disk axis.
6. The wheel disk assembly as claimed in claim 1, wherein the
blade-locating section and/or the annular projection have/has a
retaining projection which is arranged radially outside the annular
slot, extends axially to the sealing plate, and has a retaining
surface pointing toward the annular slot, and in that the sealing
plate on at least one side has a projecting support projection
having a radially outwardly pointing support surface, wherein the
support surface, at least in the event of a centrifugal force
acting upon the sealing plate, butts against the retaining
surface.
7. The wheel disk assembly as claimed in claim 1, further
comprising: a filler piece which is arranged in the recess, extends
in sections in the circumferential direction and butts against the
sealing plate.
8. The wheel disk assembly as claimed in claim 7, wherein a
radially extending contact surface and/or an axially extending
contact surface of the filler piece butts against the sealing
plate.
9. The wheel disk assembly as claimed in claim 7, wherein the
filler piece projects into the bevel and/or into the cavity.
10. The wheel disk assembly as claimed in claim 1, wherein the
blade devices have in each case an annular slot segment which is
open radially toward the disk axis, wherein the sealing plates are
fixed in the axial direction on their outer circumference in the
annular slot segments.
11. The wheel disk assembly as claimed in claim 1, wherein at least
one sealing plate is secured in the circumferential direction by
means of a circumferential displacement lock.
12. The wheel disk assembly as claimed in claim 11, wherein at
least one sealing plate for securing in the circumferential
direction has a hole and the wheel disk has an associated opening,
wherein a connecting element engages in the opening through the
hole.
13. The wheel disk assembly as claimed in claim 1, wherein all the
sealing pates are secured in the circumferential direction by means
of a circumferential displacement lock.
14. The wheel disk assembly as claimed in claim 13, wherein all the
sealing plates for securing in the circumferential direction have a
hole and the wheel disk has an associated opening, wherein a
connecting element engages in the opening through the hole.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is the US National Stage of International
Application No. PCT/EP2016/050343 filed Jan. 11, 2016, and claims
the benefit thereof. The International Application claims the
benefit of European Application No. EP15156321 filed Feb. 24, 2015.
All of the applications are incorporated by reference herein in
their entirety.
FIELD OF INVENTION
[0002] The present invention relates to a wheel disk assembly
having a wheel disk and a plurality of blade devices fastened on
the wheel disk and a plurality of sealing plates fixed in an
annular slot on the wheel disk.
BACKGROUND OF INVENTION
[0003] Wheel disk assemblies of the type referred to in the
introduction are known in the prior art in a very wide variety of
embodiments, wherein in a conventional embodiment a wheel disk has
on the outer circumference a plurality of blade-root-locating slots
which extend in the direction of the disk axis. Blade devices are
arranged in these by their blade root. For the end-face covering of
the blade-root-locating slots, sealing plates are inserted and for
this purpose are generally mounted in annular slots. GB 905,582 A
discloses a typical example of this. In this case, the wheel disk
has an encompassing, outwardly open, inner annular slot in which is
axially fixed an end of the sealing plate which points toward the
disk axis. On the opposite outer end of the sealing plate provision
is made for an inwardly open outer annular slot. The outer annular
slot is formed by the blade devices which are adjacent to each
other in the circumferential direction.
[0004] During installation, the blade devices are inserted into the
blade-root-locating slots of the wheel disk, wherein the sealing
plates are also inserted in succession between the two annular
slots. In order to be able to install the last two blade devices,
all the sealing plates have to be already mounted beforehand and be
displaced in the annular slots via their overlapping regions by
such a distance that the blade devices can be installed in the
associated slots of the wheel disk. The sealing plates are then
pushed back again in the circumferential direction into their
designated position and suitably secured there against a
displacement in the circumferential direction.
[0005] A disadvantage of the known wheel disk assemblies exists in
the fact that the sealing plates in the event of a service can only
be removed with difficulty since two adjacent blade devices have
first of all to be removed which in practice is accompanied by a
considerable cost.
SUMMARY OF INVENTION
[0006] Starting from this prior art, it is an object of the present
invention to create a wheel disk assembly of the type referred to
in the introduction, in which a greater degree of flexibility is
achieved with regard to the mounting of the sealing plates.
[0007] The generic wheel disk assembly comprises a wheel disk, a
plurality of blade devices and a plurality of sealing plates. The
wheel disk has in this case a blade-locating section which is
arranged on the outer circumference. Fastened on this, in a
detachable and circumferentially distributed manner, are the blade
devices. Furthermore, the wheel disk has an annular projection
which is at an axial distance from the blade-locating section. An
annular slot is arranged between the blade-locating section and the
annular projection. The sealing plates, by an edge region pointing
toward the disk axis, are mounted in the annular slot and fixed in
the axial direction by means of the blade-locating section and the
annular projection. The disk axis obviously corresponds to the
central rotational axis of the rotor disk. The edge region of the
sealing plates is adjacent to the end of the sealing plates which
points toward the disk axis and extends radially vertically
corresponding to its arrangement in the annular slot.
[0008] For achieving the object, it is provided according to the
invention that the annular slot is widened in the axial direction
by at least one recess which defines a sealing-plate-mounting
region. In this respect, the recess extends from the annular slot
in the axial direction into the blade-locating section and/or into
the annular projection. In this case, it is necessary that the
length of the recess in the circumferential direction is greater
than the length of the sealing plates in the edge region.
[0009] Thanks to such a recess, the sealing plates can be threaded
in a simple manner into the associated annular slots, even if all
the blade devices are already mounted on the wheel disk, as a
result of which the mounting is designed in a very flexible manner.
In this case, the sealing plates can be inserted by the edge region
for example at an angle from above into the recess and the sealing
plate can then be tilted in the direction of the wheel disk. After
that, the sealing plate can be moved in the circumferential
direction along the annular slot. By the same token, the individual
sealing plates can be removed again in a simple manner in the
reverse sequence.
[0010] It is basically irrelevant in the first instance whether the
annular slot is of segmented and/or discontinuous design provided
that the discontinued regions are not required for attaching a
sealing plate. In both a simpler and particularly more advantageous
embodiment, the annular slot in cross section--apart from the
recess--is of constantly encompassing design.
[0011] According to one embodiment of the present invention, all
the sealing plates are identically designed as identical parts, as
a result of which the production and also the storage of the
sealing plates are simplified.
[0012] It is particularly advantageous if the recess also extends
in the radial direction pointing toward the disk axis. That is to
say that the recess over a limited length enlarges the cross
section of the annular slot in the axial direction and in the
radial direction.
[0013] As a result of the enlargement which is provided both in the
axial direction and in the radial direction by means of the recess,
an advantageous free space is created for mounting the sealing
plates by their edge region. In particular, it is possible to first
of all insert the sealing plates into the recess in such a way that
these are positioned closer to the disk axis than in line with the
end position. The sealing plates can subsequently be outwardly
displaced in the radial direction and therefore be relocated into
the end position.
[0014] The annular projection, on the side facing the annular slot,
advantageously has a bevel in the region of the recess, wherein the
bevel is designed so that the annular projection is flattened
toward the annular slot. Such a bevel also simplifies the insertion
and removal of the sealing plates in the region of the recess.
[0015] According to one embodiment of the present invention, the
annular projection, on the side facing the annular slot, has in the
region of the recess an undercut region in the form of a cavity
which is open toward the annular slot.
[0016] Provision is advantageously made for two recesses which are
formed diametrically opposite one another in the wheel disk. Thanks
to a second recess, imbalances can be avoided during the designated
installation of the wheel disk assembly. Furthermore, the sealing
plates can be mounted and removed more quickly. Also conceivable is
the arrangement of a multiplicity of recesses which are to be
distributed over the circumference rotationally symmetrically to
the disk axis.
[0017] According to one embodiment of the present invention, the
annular slot is of undercut design and, as seen in cross section,
has at least one retaining projection which projects axially in the
direction of the sealing plate. The retaining projection is
correspondingly selectively located on the blade-locating section
and/or on the annular projection and is arranged radially outside
the annular slot. In this case, the retaining projection has a
retaining surface on the side pointing toward the annular slot,
i.e. toward the disk axis. It is irrelevant in the first instance
whether retaining projections are provided on one side or on both
sides and whether one retaining surface or a plurality of retaining
surfaces are provided on the retaining projection. The embodiment
with a retaining projection extending circumferentially along the
annular slot, with a retaining surface arranged thereon, is both
adequately and advantageously simple. Corresponding to this, the
sealing plates in the edge region have at least one axially
projecting support projection which is provided with a support
surface. Therefore, the edge region with the support projection
acts as a thickening for the region of the sealing plate which lies
radially outside the edge region.
[0018] The retaining surface of the retaining projection and the
support surface of the support projection are arranged in such a
way that the support surfaces of the sealing plates, during the
designated operation of the wheel disk assembly, are supported
against the retaining surface of the retaining projection under the
influence of a centrifugal force. Thanks to this embodiment, the
natural weight of the sealing plates under the influence of a
centrifugal force is absorbed by the wheel disk, as a result of
which the blade devices are relieved of load.
[0019] Provision is made for at least one filler piece which is
arranged in the recess. By means of the filler piece, it is
possible to prevent an inadvertent slipping out of the sealing
plate from the annular slot or a partial deformation of the sealing
plate in a position in which the sealing plate is arranged over a
part of the length in the region of the recess. To this end, it is
necessary that the filler piece butts against the sealing
plate.
[0020] In this case, it is advantageous on the one hand if the
filler piece by a radially extending contact surface butts axially
against the edge region of the sealing plate. Therefore, the axial
fixing of the sealing plate is also ensured in the region of the
recess.
[0021] Furthermore, it is advantageous if the filler piece has an
axially extending contact surface pointing radially outward,
against which an inner circumference of the sealing plate butts.
Correspondingly, the sealing plate in the region of the recess can
be supported on the filler piece and, especially in the case of a
recess which extends radially into the wheel disk, is not displaced
toward the disk axis with the disk assembly stationary for
example.
[0022] The filler piece is advantageously designed in such a way
that a bevel provided on the annular projection is filled out. As a
result of this, on the one hand, imbalances as a result of material
gaps which otherwise exist on one side are prevented, and in
particular a better support of the filler piece is provided by the
sealing plate in the event of an axial load.
[0023] Furthermore, it is advantageous if the filler piece, with
provision of a cavity which opens toward the recess, projects into
this cavity. On account of the undercut design in this region as a
result of the cavity, the radial fixing of the filler piece can be
achieved.
[0024] In a particularly advantageous embodiment, the blade devices
have in each case an annular slot segment which extends in sections
around the disk axis and is open radially toward the disk axis. In
this case, it is provided that the sealing plates are accommodated
on their outer circumference in the annular slot segments and in
this case are fixed in the axial direction. In this case, it is
irrelevant whether provision is made on the sealing plate for
further contours which are arranged axially next to the outer
circumference considered here. Essential instead is a securing of
the position of the sealing plate on the outer circumference in the
direction of the disk axis.
[0025] Taking into consideration the advantageous recess which
extends radially into the wheel disk, this leads to a mounting in
which the sealing plate is first of all lowered into the recess and
after pivoting or pushing is moved radially outward onto the wheel
disk. With this, the insertion of the sealing plate by the outer
circumference into the annular segments is then carried out. In
this case, it is irrelevant whether a sealing plate is accommodated
in each case in an annular slot segment or whether the sealing
plates are advantageously arranged in an overlapping manner in
relation to the blade devices and in this respect engage in
adjacent annular slot segments.
[0026] The sealing plates advantageously have in each case a
circumferential displacement lock which holds the corresponding
sealing plate in the designated position during the designated use
of the wheel disk assembly, that is to say prevents a displacement
in the circumferential direction.
[0027] According to one embodiment of the present invention, the
sealing plates have a hole and the wheel disk has associated
openings, wherein connecting elements which extend through the
holes engage in the associated openings and in the process are
advantageously fastened on the sealing plates. Thanks to the fixing
of the connecting elements on the sealing plates, an unnecessary
weakening of the wheel disk as a result of notch effect or the like
is prevented. The opening is advantageously designed in the form of
a radially extending elongated hole. Correspondingly, the sealing
plates can move radially outward under the influence of a
centrifugal force during the designated use of the wheel disk
assembly.
[0028] According to one embodiment of the invention, a multiplicity
of edges and corners of the first annular slot and/or of the
support protrusions and/or of the filler piece are provided with
radii. As a result of such radii, a weakening of the corresponding
component as a result of notch effect is avoided.
[0029] The present invention furthermore creates a method for
installing a wheel disk assembly according to the invention, in
which method all the blade devices are fastened on the wheel disk
in a first step, and the sealing plates are mounted in a further
step.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Further features and advantages of the present invention
will become clear based on the following description with reference
to the attached drawing.
[0031] In an exemplary embodiment for a wheel disk assembly
according to the invention:
[0032] FIG. 1 shows a perspective view of a wheel disk
assembly;
[0033] FIG. 2 shows a perspective view of the wheel disk in the
region of the recess;
[0034] FIG. 3 shows a cross section through the wheel disk in the
region of the recess;
[0035] FIG. 4 shows a view similar to FIG. 2 with sealing plate
inserted;
[0036] FIG. 5 shows an enlarged perspective sectional view through
the recess with sealing plate and inserted filler piece;
[0037] FIG. 6 shows a cross section for the embodiment from FIG.
5;
[0038] FIG. 7 shows a side view of the filler piece for FIG. 5;
[0039] FIG. 8 shows a perspective view for FIG. 5;
[0040] FIG. 9 shows a perspective sectional view similar to FIG. 5
with an alternative design of the recess and of the filler
piece.
DETAILED DESCRIPTION OF INVENTION
[0041] FIGS. 1 to 8 show a wheel disk assembly 1 and its components
according to a first embodiment of the present invention. The wheel
disk assembly 1 comprises a wheel disk 2, a plurality of
blade-devices 3 which are fastened along the outer circumference on
a blade-locating section 24 of the wheel disk 2 in associated
axially extending blade-root-locating slots 4, and a plurality of
sealing plates 5 which are retained between the wheel disk 2 and
the blade devices 3 in radially spaced-apart annular slot and
annular slot segments 6, 7. The annular slot 6 is in this case
provided in the wheel disk 2 and is delimited axially outward by
means of a continuous annular projection 8. Formed opposite thereto
in each case in the blade devices 3 is an annular slot segment
7.
[0042] The annular slot 6 which is provided in the wheel disk 2 is
of undercut design and, as seen in cross section, has an axially
projecting retaining projection 9 which projection 9 is provided
with a retaining surface 10. Correspondingly, the sealing plates 5
in an edge region on the inside diameter, as seen in cross section,
have an axially projecting support projection 11 which is designed
to correspond to the retaining projection 9 and which projection 11
is provided with a support surface 12.
[0043] For facilitating the mounting of the sealing plates 5, two
recesses 13 (of which recesses 13 only one recess 13 is shown in
the figures), which are diametrically opposite each other and of
identical design and in each case define a sealing-plate-locating
region, are arranged on the annular slot 6. The length of the
recess 13 in the circumferential direction is greater than the
width of the sealing plates in the edge region which is
accommodated in the annular slot 6. The recess 13 extends in the
axial direction and widens the annular slot 6. The annular
projection 8, on the side facing the first annular slot 6 in the
region of the recess 13, has a bevel 14 which bevel 14 is designed
in such a way that the annular projection 8 is flattened toward the
annular slot 6.
[0044] The wheel disk assembly 1 also comprises a filler piece 15
which filler piece 15 is designed in such a way that it fills out
the region which is widened in relation to the annular slot 6 by
the recess 13 as well as the region of the bevel 14. Furthermore,
the filler piece 15 has a projection 16 which axially points away
from the annular projection 8, extending beneath a sealing plate,
and therefore defines an axially extending contact surface which
serves for the location of an inner circumferential edge of at
least one sealing plate 5. The recess 13 which also extends
radially into the wheel disk 2 breaks up the base of the annular
slot 6 which is otherwise provided in an encompassing manner for
the seating for the sealing plates 5. By means of the axial contact
surface, a basically flush seating for the sealing plates 5 in the
region of the recess 13 is created.
[0045] The sealing plates 5 are designed identically in each case
and comprise a hole 17 in each case through which hole 17 extends a
connecting element 18 of basically pin-like design in the
designated installed state of the wheel disk assembly 1, which
connecting element 18 is fastened on the associated sealing plate 5
and engages in an opening 19, in the form of a radially extending
elongated hole, which is formed on the wheel disk 2.
[0046] During the installation of the wheel disk assembly 1, all
the blade devices 3 are mounted on the wheel disk 2 in a first
step. In a further step, the sealing plates 5 are installed one
after the other. To this end, each sealing plate 5 is inserted by
its edge region from above into the recess 13 and then tilted in
the direction of the wheel disk 2. After that, the sealing plate 5
can be moved upward, i.e. radially outward, then inserted by its
outer circumferential edge into the annular slot segments 7 and
then moved in a guided manner in the circumferential direction
between the annular slot 6 and the annular slot segments 7. In this
case, the individual sealing plates 5 are first of all pushed one
on top of the other in the circumferential direction into
overlapping regions so that after the mounting of the last sealing
plate 5 the sealing-plate-mounting region which is defined by the
recess 13 remains free. In a further step, the filler piece 15 is
then inserted into the recess 13. Next, the sealing plates 5, which
are arranged adjacently to the recess 13, are to be pushed in each
case in the circumferential direction one onto the other so that in
each case they lie half on the projection 16 of the filler piece
15. Now the filler piece 15 is secured against an inadvertent
detachment by means of the overlying sealing plates 5. In a further
step, the connecting elements 19 are pushed through the holes 17 of
sealing plates 5 so that the connecting elements 19 engage with the
associated openings 18 which are positioned in each case in
alignment with the holes 17. The connecting elements 19 are then
fastened, for example by peening, to the sealing plates 5. Now the
sealing plates 5 are secured against an inadvertent displacement in
the circumferential direction.
[0047] During the designated operation of the wheel disk assembly,
a centrifugal force acts upon the sealing plates 5, which leads to
the sealing plates 5 moving radially outward, wherein the
connecting elements 19 are guided inside the associated openings
18. The radially outward movement of the sealing plates 5 is
limited by the support projections 11, which are formed on the
sealing plates 5, as soon as the support surfaces 12 of the support
projections 11 come to butt against the retaining surfaces 10 of
the retaining projections 9 of the wheel disk 2. In this state, the
wheel disk 2 then absorbs the forces which are created by the
natural weight of the sealing plates 5.
[0048] An essential advantage of the previously described wheel
disk assembly 1 exists in the fact that the sealing plates 5,
thanks to the recesses 13, can be threaded into the associated
annular slots 6, 7 in a simple manner, even if all the blade
devices 3 are already mounted on the wheel disk 2, as a result of
which the mounting is designed to be very flexible. By the same
token, the sealing plates can also be removed again in a simple
manner. A further advantage exists in the fact that forces, which
under the influence of centrifugal force are created as a result of
the natural weight of the sealing plates 5, are absorbed by the
wheel disk 2 thanks to the retaining projection 9 which is provided
on the wheel disk 2 and to the support projections 11 which are
formed on the sealing plates 5, as a result of which the blade
devices 3 are relieved of load to a high degree during operation of
the wheel disk assembly 1.
[0049] FIG. 9 shows an alternative embodiment of a recess 20 and of
a filler piece 21 which is inserted into the recess 20. The recess
20 differs from the depicted recess 13 to the effect that the
annular projection, on the side facing the annular slot 6 in the
region of the recess 20, has an undercut region with a cavity 22
which is open toward the recess 20. The filler piece 21 differs
from the filler piece 15 to the effect that this also fills out the
undercut region, i.e. the cavity 22, and that in contrast to the
filler piece 15 there is no provision for a projection 16 pointing
away from the annular projection upon which rest the sealing plates
5. Otherwise, the embodiment shown in FIG. 9 corresponds to the
previously described wheel disk assembly 1, which is why the same
component parts or components are identified by the same
designations.
[0050] Although the invention has been fully illustrated and
described in detail by means of the preferred exemplary embodiment,
the invention is not limited by the disclosed examples and other
variations can be derived by the person skilled in the art without
departing from the extent of protection of the invention.
* * * * *