U.S. patent application number 15/078297 was filed with the patent office on 2016-09-29 for wire seal.
This patent application is currently assigned to ANSALDO ENERGIA IP UK LIMITED. The applicant listed for this patent is ANSALDO ENERGIA IP UK LIMITED. Invention is credited to Sarah HEAVEN, Sascha JUSTL, Stacie TIBOS.
Application Number | 20160281516 15/078297 |
Document ID | / |
Family ID | 52875464 |
Filed Date | 2016-09-29 |
United States Patent
Application |
20160281516 |
Kind Code |
A1 |
HEAVEN; Sarah ; et
al. |
September 29, 2016 |
WIRE SEAL
Abstract
The disclosure concerns a wire seal for sealing a gap between
two components of a gas turbine, the wire seal including a first
core and a second core spaced apart from one another, a wire pack
extending around the first core and the second core, and a fastener
for securing the wire pack to the first core and the second core,
wherein the wire seal is curved. Various embodiments are disclosed,
including various types of fastener. A method of manufacturing a
wire seal is also disclosed.
Inventors: |
HEAVEN; Sarah;
(Warwickshire, GB) ; TIBOS; Stacie; (Warwickshire,
GB) ; JUSTL; Sascha; (Zurich, CH) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ANSALDO ENERGIA IP UK LIMITED |
London |
|
GB |
|
|
Assignee: |
ANSALDO ENERGIA IP UK
LIMITED
London
GB
|
Family ID: |
52875464 |
Appl. No.: |
15/078297 |
Filed: |
March 23, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F05D 2240/57 20130101;
F01D 9/023 20130101; F02K 9/343 20130101; F23R 3/60 20130101; F01D
11/005 20130101; F05D 2240/55 20130101; F01D 9/041 20130101 |
International
Class: |
F01D 9/02 20060101
F01D009/02; F01D 11/00 20060101 F01D011/00; F23R 3/60 20060101
F23R003/60; F01D 9/04 20060101 F01D009/04 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 25, 2015 |
EP |
15160744.7 |
Claims
1. A wire seal for sealing a gap between two components of a gas
turbine, the wire seal comprising: a first core and a second core
spaced apart from one another, a wire pack extending around the
first core and the second core, and a fastener for securing the
wire pack to the first core and the second core, wherein the wire
seal is curved.
2. The wire seal of claim 1, comprising: a plate with a first face,
a second face, a first edge including the first core, a second edge
including the second core and two end edges, wherein the first edge
is opposite the second edge, wherein the wire pack extends around
the first face, the first edge, the second face and the second edge
of the plate, and wherein the fastener secures the wire pack around
the plate.
3. The wire seal of claim 1, wherein the fastener comprises: a
first clamp for securing the wire pack to the first core and a
second clamp for securing the wire pack to the second core.
4. The wire seal of claim 1, wherein the fastener comprises: at
least one end piece attached at each end of the first core and the
second core, to hold the wire pack in place adjacent to the first
core and the second core.
5. The wire seal of claim 1, wherein the fastener extends around
the wire pack from the first core to the second core, to hold the
wire pack in place adjacent to the plate.
6. The wire seal of claim 2, comprising: a first core wire attached
to the first edge and a second core wire attached to the second
edge.
7. The wire seal of claim 1, wherein the wire seal is a conical
wire seal.
8. The wire seal of claim 1, wherein the first core is a first core
wire and the second core is a second core wire.
9. A gas turbine comprising the wire seal of claim 1.
10. The gas turbine of claim 9, comprising: a combustor and a first
vane separated by a gap, and wherein the wire seal is arranged to
seal the gap.
11. The gas turbine of claim 10, wherein the combustor comprises: a
picture frame and wherein the gap is between the first vane and the
picture frame.
12. The gas turbine of claim 11, comprising: a socket in the
picture frame, and wherein the wire seal is seated in the
socket.
13. A method of manufacturing a wire seal for sealing a gap between
two components of a gas turbine, the wire seal having a first core
and a second core spaced apart from one another, a wire pack
extending around the first core and the second core, and a fastener
for securing the wire pack to the first core and the second core,
wherein the wire seal is curved, the method comprising: placing the
wire pack around the plate; and fastening the wire pack to the
plate with the fastener.
14. The method of claim 13, in which the wire pack is made of wire
and is placed around the first core and the second core by winding
the wire repeatedly around the first core and the second core.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to wire seals, and
particularly to wire seals for sealing a gap between a picture
frame and a first vane of a gas turbine.
BACKGROUND OF THE INVENTION
[0002] In a gas turbine, there is a sealing interface between
combustor outlet and the first vane of the turbine. Movement of the
two parts relative to one another can be considerable, and a gap
must be left between the parts to avoid contact. The gap is
generally purged with cooling air. It has been appreciated that it
would be advantageous to improve the design around this gap to, for
example, reduce the cooling air requirements.
SUMMARY OF THE INVENTION
[0003] The invention is defined in the appended independent claims
to which reference should now be made. Advantageous features of the
invention are set forth in the dependent claims.
[0004] A first aspect of the invention provides a wire seal for
sealing a gap between two components of a gas turbine, the wire
seal comprising a first core and a second core spaced apart from
one another, a wire pack extending around the first core and the
second core, and a fastener for securing the wire pack to the first
core and the second core, wherein the wire seal is curved. The
plate can provide extra sealing in addition to the wire pack, for
example if a gap opens in the wire pack during use. The wire pack
can help protect the plate, thereby increasing the lifetime of the
plate in a high temperature environment. The wire seal can cope
with the large relative axial and radial movements of the picture
frame and first vane (first turbine vane).
[0005] In one embodiment, the wire seal comprises a plate with a
first face, a second face, a first edge comprising the first core,
a second edge comprising the second core and two end edges, wherein
the first edge is opposite the second edge, wherein the wire pack
extends around the first face, the first edge, the second face and
the second edge of the plate, and wherein the fastener secures the
wire pack around the plate. The plate can improve the seal.
[0006] In one embodiment, the fastener comprises a first clamp for
securing the wire pack to the first core and a second clamp for
securing the wire pack to the second core.
[0007] In one embodiment, the fastener comprises at least one end
piece attached at each end first core and the second core, to hold
the wire pack in place adjacent to the first core and the second
core. In one embodiment, the fastener extends around the wire pack
from the first core to the second core, to hold the wire pack in
place adjacent to the plate. In one embodiment, the wire seal
comprises a first core wire attached to the first edge and a second
core wire attached to the second edge. In one embodiment, the wire
seal is a conical wire seal. In one embodiment, the first core is a
first core wire and the second core is a second core wire.
[0008] A second aspect of the invention provides a gas turbine
comprising a wire seal as described above. In one embodiment, the
gas turbine comprises a combustor and a first vane separated by a
gap, and wherein the wire seal is arranged to seal the gap. Leakage
reduction through this gap can thereby be achieved. In one
embodiment, the combustor comprises a picture frame and wherein the
gap is between the first vane and the picture frame. In one
embodiment, the gas turbine comprises a socket in the picture
frame, and wherein the wire seal is seated in the socket. This can
hold the wire seal in place.
[0009] A third aspect of the invention provides a method of
manufacturing a wire seal for sealing a gap between two components
of a gas turbine, the wire seal comprising a first core and a
second core spaced apart from one another, a wire pack extending
around the first core and the second core, and a fastener for
securing the wire pack to the first core and the second core,
wherein the wire seal is curved, comprising the steps of placing
the wire pack around the plate and fastening the wire pack to the
plate with the fastener. In one embodiment, the wire pack is made
of wire and is placed around the first core and the second core by
winding the wire repeatedly around the first core and the second
core.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] An embodiment of the invention will now be described by way
of example only and with reference to the accompanying drawings in
which:
[0011] FIG. 1 shows a perspective view of a wire seal;
[0012] FIG. 2 shows a schematic top view of the wire seal of FIG.
1;
[0013] FIGS. 3, 4 and 5 show cross-sections of part of a gas
turbine comprising a wire seal, during different phases in gas
turbine operation;
[0014] FIG. 6 shows a perspective view of another wire seal;
and
[0015] FIG. 7 shows a perspective view of a further wire seal.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0016] FIG. 1 shows a wire seal 10 comprising a first core wire 12,
a second core wire 14, a plate 16, a first clamp 18, a second clamp
20 and a wire pack 22.
[0017] The first core wire 12 is attached to one edge (a first
edge) of the plate 16 and the second core wire 14 is attached to
the opposite edge (a second edge) of the plate 16. The wire pack 22
extends around the first and second core wires 12, 14 and the plate
16. The wire pack is held in place by a fastener, in this case the
first and second clamps 18, 20. The first clamp extends around the
portion of the wire pack closest to the first core wire, with the
second clamp arranged in the same way close to the second core
wire. As the plate is thinner than the diameter of the first and
second core wires, the effective width (the width including the
plate/core wires) of the cross-section of the wire pack 22
perpendicular to the plate 16 is greater at the core wires 12, 14
than in the main portion of the wire pack 22 at the plate 16.
[0018] FIG. 2 shows a top view of the wire seal 10 in FIG. 1. In
contrast to FIG. 1, where only a short portion of seal is shown and
curvature is not shown, FIG. 2 shows the curvature of the wire seal
10.
[0019] FIG. 3 shows a cross-section of the wire seal 10 in a gas
turbine. The gas turbine comprises a first vane 30, a picture frame
32 and a bulkhead 34. The bulkhead 34 may be an integral part of
the picture frame 32 or a separate component attached to the
picture frame 32, as is shown in FIG. 3. The wire seal 10 extends
across a gap 36 between the first vane 30 and the picture frame
32/bulkhead 34. The first clamp 18 of the wire seal 10 contacts the
first vane 30, and the second clamp 20 of the wire seal 10 fits
within a socket 38 in the bulkhead 34 (or in the picture frame
32).
[0020] In a gas turbine, a plurality of picture frames (sequential
liner outlets) are arranged around the longitudinal axis of the gas
turbine in a ring, with the picture frames typically being attached
to sequential liners (combustor linings) and the sequential liners
typically surrounding can combustors. The picture frames generally
all intersect a plane perpendicular to the gas turbine longitudinal
axis. The wire seal discussed in this application can be applied on
either the inner or outer diameters of the picture frames (the edge
of the picture frames closest to the gas turbine longitudinal
axis). This can allow for single vane/blade assembly and/or
disassembly during manufacture, maintenance and repair.
[0021] In FIG. 3, the gas turbine is shown during a heating phase.
In FIG. 4, the gas turbine is shown in a running phase during
normal operation, and in FIG. 5, the gas turbine is shown in a
forced cool down phase. During the different phases, the first vane
30 moves relative to the picture frame 32, varying the shape and
width of the gap 36. The movement of the first vane 30 relative to
the picture frame 32 includes both axial and radial movement
relative to the gas turbine longitudinal axis (also the wire seal
longitudinal axis, in wire seal longitudinal direction 40). It is
this movement that the wire seal 10 can be designed to withstand,
maintaining a seal across the gap 36.
[0022] FIG. 6 shows an alternative wire seal 10. As with the wire
seal of FIG. 1, this wire seal comprises a plate 16 and a wire pack
22, but does not comprise first and second core wires. Optionally,
core wires could be added to this embodiment. The embodiment of
FIG. 6 comprises a fastener that differs from the fastener shown in
FIG. 1. In the embodiment of FIG. 6, four end pieces 60 are
provided as a fastener. These end pieces are attached to the four
corners of the plate 16 and, as with the clamps shown in FIG. 1,
the end pieces 60 are arranged to hold the wire pack 22 on the
plate 16. The plate 16 extends beyond the wire pack 22 at the sides
to provide a surface for attachment of the clamps, although this is
not essential. Similarly, slots are provided in the end pieces in
which the plate is placed, and these slots are also optional.
Providing a larger contact surface for the end pieces 60 on the
plate 16 can allow for a better join between the end pieces 60 and
the plate 16.
[0023] FIG. 7 shows another alternative wire seal 10. As in FIG. 6,
four end pieces 60 are provided. In addition to the end pieces 60,
a further fastener in the form of a central clamp is provided
across the wire seal 10, extending across the wire seal 10 from one
end edge of the plate to the other end edge, with the central clamp
extending in the same direction as the first edge and the second
edge. The central clamp comprises two central clamp end pieces 72
and at least one connecting bar 74.
[0024] In a method of manufacturing a wire seal 10 as shown in FIG.
1, the first and second core wires 12, 14 are first attached to the
plate 16. The wire pack 22 is then placed around the first and
second core wires 12, 14 and the plate 16, for example by wrapping
a wire repeatedly around the first and second core wires 12, 14 and
the plate 16 to create the wire pack 16. Before the wire is wrapped
around, one end of it may be attached, for example by welding, to
one of the first and second core wires 12, 14 and/or the plate 16.
After the wire pack 22 is in place, the first and second clamps 18,
20 are attached.
[0025] The wire that makes up the wire pack 22 is described above
as being attached to another part of the wire seal before being
wrapped around the plate, but one or both ends of the wire may be
attached either before or after the wire is wrapped around the
plate.
[0026] To manufacture the wire seal 10 as shown in FIG. 6, the
plate 16 is first attached to the end pieces 60 and the wire pack
22 is then placed around the plate 16, for example by wrapping a
wire repeatedly around the plate 16. The end pieces 60 may
alternatively be attached after the wire pack 22 is placed around
the plate 16.
[0027] To manufacture the wire seal 10 as shown in FIG. 7, the same
method of manufacture for the embodiment in FIG. 6 can again be
used, with the addition of adding a central clamp. The central
clamp can be added in two ways. Firstly, the central clamp can be
made in pieces and joined together once it is in place around the
wire pack 22, in which case the central clamp can be attached at
any time after the wire pack 22 is in place. Secondly, the central
clamp can be made as a single piece (or made in pieces and then
assembled before attachment to the wire pack) and then slid onto
the wire pack from the first edge (or from the second edge, in the
case of a straight wire seal). In this case, the central clamp must
be attached after the wire pack 22 is in place and before the end
pieces have been attached, in embodiments such as that of FIG. 7
where the end pieces have a diameter larger than the effective
width of the wire pack at the point on the wire pack where the
central clamp is attached (as explained in more detail below).
[0028] The wire seal 10 is described above as sealing the gap
between a picture frame and a first vane of a gas turbine, but more
generally the wire seal may also seal the gap between two
components, for example between the first vane and another part of
the combustor such as the combustor lining. The components to be
sealed would normally both be static (static-to-static
sealing).
[0029] The wire seal 10 may be straight as shown in the small
portions shown in FIGS. 1, 6 and 7, or may be curved in a
circumferential direction (relative to the wire seal longitudinal
axis), as shown in FIG. 2. A curved wire seal is preferable for the
wire seals used in a gas turbine as described in FIGS. 3 to 5. The
wire seal may also be a full ring. Generally though, multiple wire
seals will be used in a ring. In one example, 20 wire seals are
placed around a 360.degree. annular joint, each extending
15.degree. around the gas turbine circumference in the
circumferential direction 42. Each picture frame around the gas
turbine circumference preferably has at least one wire seal on the
inner diameter (inner platform), as this can help enable single
vane/blade assembly/disassembly.
[0030] The wire seal can be annular. In the case of an annular wire
seal, the wire seal describes (a section of) a ring in which the
first edge and the second edge are at the same distance from the
gas turbine longitudinal axis (wire seal longitudinal axis); that
is, the radius of curvature of the first edge and the second edge
are the same. A radial wire seal could also be used, in which the
second edge is further from the gas turbine longitudinal axis than
the first edge and in the same plane perpendicular to the gas
turbine longitudinal axis direction.
[0031] Preferably though, the wire seal is a conical wire seal. The
conical wire seal has a second edge that is further from the gas
turbine longitudinal axis than the first edge and in a different
plane perpendicular to the gas turbine longitudinal axis
direction.
[0032] For completeness, it is noted that a cone is a
three-dimensional geometric shape that tapers smoothly from a flat
base; the base may be circular or may be another shape.
Mathematically, a conical wire seal is conical frustum, being in
the shape of the surface of the frustum of a cone (i.e. a section
of the cone not including the apex, also known as a truncated
cone), in contrast to an annular wire seal in which the wire seal
follows the shape of the surface of a cylinder.
[0033] The first and second core wires 12, 14 are optional, and one
or both may be omitted, such as in the embodiments in FIGS. 6 and
7. For example, one of both of the core wires of the embodiment of
FIG. 1 may be omitted, and one or two core wires may be added to
the embodiments of FIG. 6 and FIG. 7. Alternatively, one or two
core wires may be included as an integral part of plate 16, or may
simply be the first edge 25 and second edge 26 of the plate 16
respectively. The two core wires preferably have the same diameter,
but may also have different diameters.
[0034] Although most of the plate 16 is not directly visible in the
Figures, the plate 16 can be described in more detail as follows,
with reference to FIGS. 1 and 2. The plate 16 has a first face 23,
a second face 24 and four edges 25, 26, 27. Of these four edges,
the wire pack 22 extends around a first edge 25 and a second edge
26, the first edge 25 and the second edge 26 being opposite one
another. In FIG. 1, the first edge 25 and the second edge 26 are
adjacent to the first core wire 12 and the second core wire 14
respectively. Two end edges 27 complete the plate 16, and it is one
of these end edges 27 that is visible in FIGS. 1, 6 and 7.
Typically, the first edge and the second edge are longer than the
two end edges. Typically, the two end edges are the same length.
Typically, in the case of a wire seal extending in a
circumferential direction (relative to the wire seal longitudinal
axis), the second edge is (slightly) longer than the first edge and
the radius of curvature of the second edge is (slightly) larger
than the radius of curvature of the first edge. The plate 16 may be
a solid sheet or may be a mesh. In embodiments with a plate, the
first core and the second core are part of the plate, at the first
and second edges respectively. First and second core wires may
additionally be attached to the first and second cores respectively
in such cases. The plate is optional and may be omitted in some
embodiments. When no plate is present, the first and second cores
correspond to the first and second core wires.
[0035] In embodiments comprising core wires, the plate is
preferably thinner than the diameter of the first and second core
wires, but in some embodiments the plate may be the same width as
or wider than the diameter of the first and second core wires. The
plate and the first and second core wires are described as separate
components in the examples described above, but they may be one
integrated component. The core wires may also be omitted entirely,
as in the embodiments of FIGS. 6 and 7.
[0036] The attachment between the first and second core wires and
the plate 16 can be a physical attachment such as a weld.
Alternatively or additionally, a slot can be provided in the first
and second core wires, and the plate is arranged in the slot. If a
slot is provided, a physical attachment between the first and
second core wires and the plate is optional, as the wire pack can
hold the first and second core wires and the plate together.
[0037] The wire pack 22 may be made up of one or more wires
repeatedly wound around the plate (and the first and second core
wires in embodiments with core wires). Alternative wire packs are
also possible; for example, a mesh or a chain could be wound around
instead of a wire. The wire pack wire, mesh, chain or the like is
typically attached at each end to stop it from unravelling, and can
be attached to any appropriate part of the wire seal, for example a
fastener, the plate or another part of the wire pack.
[0038] The wire pack is held on to the plate by a fastener or
fasteners. Without appropriate fastening, the wire pack can unravel
and/or slide off the end edges of the plate, and the clamps are
designed to restrict the movement of the wire pack relative to the
plate. The wire pack can also be fastened directly to the plate
and/or to the clamps.
[0039] Various fasteners are described in this application, but
other types of fastener and modifications to the described
fasteners are possible. Any combination of the described fasteners
is also possible in addition to those combinations already
described. For example, the fasteners of the wire seals of FIGS. 1
and 6 could both be used on the same wire seal, to improve the
clamping of the wire pack.
[0040] The first and second clamps 18, 20 can vary in shape but are
each typically designed to encircle an end edge of the plate. The
first and second clamps may be made as a spring so that the first
and second clamps are in tension and are pushing on the wire pack
to keep the wire pack against the plate. This can also help ensure
that the first and second clamps do not slip off the wire pack, and
may be particularly useful in cases without core wires. The first
and second clamps could be attached to one another by one or more
connecting bars extending across the surface of the wire pack (in
the direction perpendicular to the first and second edges of the
plate), in a similar manner to the connecting bar 74 between the
central clamp end pieces 72 in the embodiment of FIG. 7. The first
and second clamps can also be attached to the wire pack or the
plates. The first and second clamps are shown in FIG. 1 with a
rounded cross-section in a plane perpendicular to the first and
second edges of the plate, but the clamp could also have a square
or rectangular cross-section, similar to the shape of the central
clamp end piece 72.
[0041] The end pieces 60 in the wire seal of FIG. 6 are cylindrical
with circular faces, but clamps of a different shape could be
provided, such as square- or hexagonal-faced clamps. Two or more of
the clamps could also be connected together; for example, the two
end pieces at either end of one end edge of the plate could be
connected or could be a single plate extending along part or all of
the extent of the end edge.
[0042] In embodiments with first and second core wires, the end
pieces can be attached to the first and second core wires and/or
the plate. The first and second core wires may extend beyond the
end edges of the plate, in which case holes would be provided in
the end pieces to connect with the first and second core wires.
This could provide a better join between the first and second core
wires and the end pieces. The end pieces may additionally be
attached to the wire pack.
[0043] The diameter of the end pieces in the wire seals of FIGS. 6
and 7 is larger than the width of the wire pack (in the direction
perpendicular to the plane of the plate). Alternatively, the
diameter of the end pieces may be the same as the width of the wire
pack. In some embodiments the diameter of the end pieces may even
be slightly smaller than the width of the wire pack, as long as the
diameter of the end pieces is sufficient to hold the wire pack on
to the plate. The diameter of the different end pieces may vary;
for example, the two end pieces adjacent to the first edge of the
plate could be smaller in diameter than the two end pieces adjacent
to the second edge of the plate.
[0044] The first vane of the gas turbine may comprise one or more
slots to accommodate the shape of fasteners such as end pieces 60.
This can improve the seal and can also ensure that the wire seal
remains in the correct place in the gap. In some of the embodiments
the fastener contacts the first vane and/or the bulkhead/picture
frame, and in other embodiments the wire pack contacts the first
vane and/or the bulkhead/picture frame.
[0045] The central clamp 70 may be one integral part, or may be two
or more parts. In the embodiment of FIG. 7, the central clamp 70 is
three connected parts, namely two central clamp end pieces 72 and
one connecting bar 74. Various other central clamp arrangements are
possible. For example, the connecting bar is narrower than the
central clamp end pieces (in the direction across the seal
perpendicular to the first and second edges of the plate) in the
embodiment of FIG. 7, but could be the same width or wider than the
central clamp end pieces. The T-clamp could have more than two
central clamp end pieces and/or more than one connecting bar.
Subsequent connecting bars could be on the same face of the wire
seal as the first connecting bar and/or on the opposite face (i.e.
on the face that is not shown in FIG. 7). The T-clamp could be used
without any other form of fastener, or in combination with another
fastener. The point of the T-clamp is generally to hold the wire
pack on the plate, both so that the wire pack does not slide off
the end edges and also so that the wires making up the wire pack
are kept close to the faces of the plate 16. This stops the wire
pack from expanding or bending away from the plate.
[0046] The picture frame 32, bulkhead 34 and first vane 30 may all
vary in shape compared to the embodiments shown above, and the
design can depend on variables such as the shape of the wire seal
and the relative motion of the picture frame/bulkhead and the first
vane.
[0047] The socket 38 in the picture frame/bulkhead is optional, and
in some embodiments is not necessary. For example, a socket could
alternatively be provided in the first vane to hold the wire seal
in place. Sockets could also be provided on both the first vane and
the picture frame/bulkhead. Other connecting components could also
be provided to pivotally attach the wire seal to the first vane or
the picture frame/bulkhead.
[0048] Typically, the gap is also purged with a cooling fluid such
as cooling air, and there can therefore be a higher pressure on the
side of the wire seal further from the hot gas path than on the
side of the seal closer to the hot gas path. This pressure
differential could hold the seal in place, and can also improve the
quality of the seal.
[0049] The wire seals described herein are preferably for sealing
gaps between two stationary parts, rather than gaps between a rotor
and a stator.
[0050] Various modifications to the embodiments described are
possible and will occur to those skilled in the art without
departing from the invention which is defined by the following
claims.
REFERENCE SIGNS
[0051] 10 wire seal
[0052] 12 first core wire
[0053] 14 second cord wire
[0054] 16 plate
[0055] 18 first clamp
[0056] 20 second clamp
[0057] 22 wire pack
[0058] 23 first face
[0059] 24 second face
[0060] 25 first edge
[0061] 26 second edge
[0062] 27 end edge
[0063] 30 first vane
[0064] 32 picture frame
[0065] 34 bulkhead
[0066] 36 gap
[0067] 38 socket
[0068] 40 wire seal longitudinal direction (gas turbine
longitudinal direction)
[0069] 42 circumferential direction
[0070] 60 end piece
[0071] 70 central clamp
[0072] 72 central clamp end piece
[0073] 74 connecting bar
* * * * *