Title of Invention

HEAT-SHIELD ARRANGEMENT FOR A COMPONENT DIRECTING HOT GAS

Abstract The invention relates to a heat-shield component (1) having an outer hollow body (100) and an insert (110) which in each case can be attached to a supporting structure (17). The outer hollow body (100) encloses the insert (110) while leaving an intermediate space (151). The outer hollow body (100) has a first base side (101) which can be exposed to a hot gas. The insert (110) has a second base side (111) having a plurality of openings (113) for the passage of cooling fluid (4) into the intermediate space (151) for impingement cooling of the first base side (101). The invention also relates to a heat shield arrangement (20).
Full Text The invention relates to a heat-shield component
which is part of a hot-gas wall to be cooled. Further-
more, the invention relates to a heat-shield arrangement
which lines a hot-gas space, in particular a combustion
chamber of a gas-turbine plant, and has a plurality of
heat-shield components.
On account of the high temperatures which prevail
in hot-gas passages or other hot-gas spaces, it is
necessary for the inner wall of a hot-gas passage to be
designed in the best possible way in terms of temper-
ature-resistance. On the one hand, high-temperature-
resistant materials, such as, for example, ceramics, are
suitable for this purpose. The disadvantage of ceramic
materials lies both in their great brittleness and in
their unfavourable heat and temperature conductivity. A
suitable alternative to ceramic materials for heat
shields are high-temperature-resistant metal alloys on an
iron, chromium, nickel or cobalt basis. However, since
the service temperature of high-temperature-resistant
metal alloys is markedly below the maximum service
temperature of ceramic materials, it is necessary to cool
metallic heat shields in hot-gas passages.
One possibility is proposed, for example, by
Craemer in US 4,838,031 of 13 th June 1989. Craemer
proposes a panel which consists of four components and is
to be mounted on the inside of a combustion-chamber
casing. In this case, the top layer facing the hot-gas
space is made of a refractory metal, but may also be
formed by a ceramic material. This is followed underneath
by a layer of steel-wool-like metallic filaments. These
filaments rest on a relatively large number of column-
like supports. These column-like supports and the
cavities in between form the third layer. The column-like
supports are attached to a fourth metallic layer. The
steel-wool-like metallic filaments of the second layer
absorb heat energy from the overlying layer forming the
inner burner wall and transfer said heat energy to the
air flow directed between the column-like supports. In
this case, the cavities of the third layer, via passages
which lead through the fourth layer and the burner
casing, are connected to a space outside the burner, and
this space is fed with air via a compressor. The
compressed air, as coolant, can pass through these
passages into the cavity formed by the layers.
In addition, a second type of passage is distri-
buted over the front and centre region of the combustion
chamber, through which passages the air originating from
the exterior of the combustion chamber passes through the
combustion-chamber casing and the layered panels into the
combustion chamber.
The proposal by Craemer has the disadvantage that
cool eiir flows into the combustion chamber over the
entire region of the latter without having participated
in the combustion. As a consequence thereof, the temper-
ature at the outlet of the combustion chamber drops.
A heat-shield arrangement, in particular for.
structtiral parts of gas-turbine plants, is described in
EP 0 224 817 B1. The heat-shield arrangement has an inner
lining which is made of heat-resistant material and is
composed of heat-shield elements in such a way as to
cover the surface, which heat-shield elements are
anchored to the supporting structure. These heat-shield
elements are arranged next to one another while leaving
gaps for the throughflow of cooling fluid and are
thermally movable. Each of these heat-shield elements has
a cap part and a shank part like a mushroom. The cap part
is a flat or spatial, polygonal plate body having
straight or curved boundary lines. The shank part con-
nects the central region of the plate body to the sup-
porting structure. The cap part preferably has a tri-
angular shape, as a result of which an inner lining of
virtually any geometry can be produced by identical cap
parts. The cap parts as well as if need be other parts of
the heat-shield elements are made of a high-temperature-
resistant material, in particular a steel. The supporting
structure has bores through which a cooling fluid, in
particular air, can flow into an intermediate space
between cap part and supporting structure and can flow
from there through the gaps, intended for the throughflow
of the cooling fluid, into a spatial region, for example
a combustion chamber of a gas-turbine plant, surrounded
by the heat-shield elements. This cooling fluid flow
reduces the ingress of hot gas into the intermediate
space.
Described in DE 35 42 532 A1 is a wall, in
particular for gas-turbine plants, which has cooling-
fluid passages. In gas-turbine plants, the wall is
preferably arranged between a hot space and a cooling-
fluid space. It is assembled from individual wall
elements, each of the wall elements being a plate body
made of a high-temperature-resistant material. Each plate
body has parallel cooling passages which are distributed
over its surface area and communicate at one end with the
cooling-fluid space and at the other end with the hot
space. The cooling fluid, flowing into the hot space and
directed through the cooling-fluid passages, forms a
cooling-fluid film on that surface of the wall element
and/or adjacent wall elements which faces the hot space.
In summary, all of these heat-shield arrange-
ments, in particular for gas-turbine combustion chambers,
are based on the principle that compressor air is
utilized as cooling medium for the combustion chamber and
its lining and also as sealing air. The cooling and
sealing air enters the combustion chamber without having
participated in the combustion. This cold air mixes with
the hot gas. As a result, the temperature at the outlet
of the combustion chamber drops. Therefore the output of
the gas turbine and the efficiency of the thermodynamic
process decrease. Partial compensation may be carried out
by a higher flame temperature being set. However, this
then results in material problems, and higher emission
values have to be tolerated. It is likewise a dis-
advantage with the arrangements specified that, in the
case of the air fed to the burner, pressure losses result
due to the entry of the cooling fluid into the combustion
chamber.
Described in the subsequently published WO I
9 8/13 645 A1 is a heat-shield component with cooling-fluid
return, having a hot-gas wall to be cooled, an inlet
passage for cooling fluid, and an outlet passage for the
cooling fluid, the inlet passage being directed towards
the hot-gas wall and widening in the direction of the
hot-gas wall. The inlet passage is largely surrounded by
the outlet passage. The supporting structure is designed
as a twin-wall structure, having an outer wall and an
inner wall arranged parallel to and adjacent to the outer
wall while leaving an intermediate space. For fastening
to the supporting structure, the heat-shield component,
at the outlet passage, has a fastening part with which
the outlet passage is put onto the outer wall and
fastened to the latter. Inside the outlet passage, the
outer wall has an opening through which the inlet passage
is directed while leaving a gap. The inner wall has a
further opening into which the inlet passage is pushed
over a short length. Cooling fluid can be fed to the
heat-shield component via the inlet passage and dis-
charged via the outlet passage. The inlet passage is
covered with a cover wall which has impingement-cooling
openings. Through the impingement-cooling opening,
cooling fluid fed from the inlet passage can strike the
hot-gas wall, in the course of which the latter is
cooled.
The object of the invention, for a hot-gas space
of a plant, is to specify a heat-shield component which
can be cooled with a cooling fluid as well as a heat-
shield arrangement having heat-shield components, which
heat-shield arrangement permits economical operation of
the plant.
The object which relates to the heat-shield
component is achieved according to the invention by a
heat-shield component which can be attached to a support-
ing structure and has an outer hollow body which encloses
an insert with an intermediate space formed between the
outer hollow body and the insert, the outer hollow body
having a first base side which can be exposed to a hot
gas and side walls, and the insert having side walls and
a second base side having a plurality of openings for the
passage of cooling fluid into the intermediate space, the
outer hollow body and the insert in each case being
attachable to the supporting structure. The heat-shield
component can be attached to the supporting structure
without the supporting structure having to be penetrated
by the heat-shield component. As a result, the supporting
structure can be configured largely with a closed sur-
face, in which case relatively small openings, such as
bores or the like, may be provided if need be, for
example for fastening the heat-shield component in the
supporting structure, which bores can be made in a
mechanically simple manner.
The side walls of the insert can preferably be
put onto the supporting structure in such a way that an
interior space, which is defined by the insert and the
supporting structure, is formed. An interior space
fluidically connected to the intermediate space via the
openings is thereby formed, into which interior space a
cooling fluid can be directed to begin with, and this
cooling fluid flows through the openings into the inter-
mediate space and strikes the first base side in order to
cool the latter.
In particular, the top edges of the side walls of
the hollow body are disposed on the supporting structure
along the full periphery of the heat-shield component and
largely seal off the space, in which the cooling fluid is
located, relative to the hot-gas space. The side walls of
the hollow body preferably have a geometrical form which
enables a seal to be introduced between hollow body and
supporting structure. The seal may be designed, for
example, as a compression seal. In this case, due to the
geometry of the hollow body, the seal lies on the cold
side of the heat-shield component.
The insert is also preferably exchangeable. The
heat-shield component is thereby configured in such a way
that, if need be, the insert or the outer hollow body can
in each case be exchanged on its own.
A first outer hollow body and a second outer
hollow body are preferably attachable next to one another
on the supporting structure, a side wall of the first
outer hollow body and a side wall of the second outer
hollow body being adjacent to one another while leaving
a gap, the side walls in each case having a surface
contour such that the gap is winding. As a result, the
gap forms a choke point via which hot gas directed
outside the heat-shield component can penetrate into the
gap only with difficulty or cooling fluid issuing from
the heat-shield component can pass through the gap only
with difficulty. This can be achieved, for example, by
interlocking steps or indentations of adjacent side walls
of hollow bodies. As a result, cooling fluid or hot gas
passing into the gap is deflected several times.
The inner base side of the hollow body can
preferably have cooling ribs or the like, as a result of
which the cooling with a cooling fluid can be optimized.
The heat-shield components are preferably
fastened to the supporting structure via a centrally
attached retaining bolt. The retaining bolt may be
provided with disc springs so that greater resilience is
ensured if the heat-shield component exceeds the
permissible expansion. For reasons of simple assembly,
the retaining bolt can be attached to the hot side of the
heat-shield component. However, it is also possible for
the restaining bolt to be located on the cold side of the
heat-shield component. The latter has an advantageous
effect on the corrosion properties of the heat-shield
component.
The base side of the hollow body may alternative-
ly have a triangular, four-cornered (in particular
quadrilateral or trapezoidal) or hexagonal surface area.
Other suitable geometrical forms are also possible. For
quadratic base sides of the hollow body, the typical
order of magnitude is around 200 mm edge length. The wall
thickness of the base side of the hollow body is prefer-
ably less than 10 mm, in particular preferably between 3
and 5 mm. A relatively small temperature difference
between inner and outer surfaces of the base side of the
hollow body is thereby ensured. A high alternating-load
resistance of the heat-shield component can thus be
achieved.
The heat-shield component is made of a heat-
resistant material, in particular a metal or a metal
alloy. It is advantageous to produce the heat-shield
component, in particular the hollow body, as an invest-
ment casting.
The object which relates to the heat-shield
arrangement is achieved according to the invention by a
heat-shield arrangement which comprises a plurality of
heat-shield components which are arranged next to one
another on a supporting structure, a heat-shield
component being attachable to the supporting structure
and having an outer hollow body which encloses an insert
with an intermediate space formed between the outer
hollow body and the insert, the outer hollow body having
a first base side which can be exposed to a hot gas and
side walls, and the insert having side walls and a second
base side having a plurality of openings for the passage
of cooling fluid into the intermediate space, the outer
hollow body and the insert in each case being attachable
to the supporting structure, and a wall of a component
directing hot gas, in particular of a combustion chamber
of a gas-turbine plant, which wall can be exposed to a
hot gas, being formed by the base sides of the heat-
shield component.
A component directing hot gas, in particular a
combustion chamber of a gas turbine, can be lined with
such a heat-shield arrangement, the heat-shield arrange-
ment protecting the supporting structure, which may, for
example, be a wall of the combustion chamber, against the
heat effect caused by the hot gas. The individual heat-
shield components can be cooled with a closed cooling-
fluid circuit.
The supporting structure for the heat-shield
component preferably has in each case an inlet passage
for cooling fluid in a first region inside the side walls
of the insert and an outlet passage into the intermediate
space for cooling fluid. In this way, cooling fluid can
be directed via the inlet passage into the insert of a
heat-shield component, from which the cooling fluid
passes through the openings into the intermediate space
for impingement cooling of the respective first base
side. The cooling fluid can be discharged from the
intermediate space via the outlet passage.
It is also preferable for the inlet passage to be
connected to a feed passage, which is arranged outside
the hot-gas space, and for the outlet passage to be
connected to a discharge passage, which is likewise
arranged outside the hot-gas space. Thus, cooling fluid
can be fed to the inlet passage via the feed passage, and
the cooling fluid heated after the impingement cooling
can be discharged via the outlet passage and a discharge
passage. In this way, cooling fluid can be directed in a
closed cooling-fluid circuit.
The cooling fluid can preferably be fed to the
heat-shiesld component from a compressor, in particular of
a gas turbine, via the feed passage and is discharged via
the discharge passage, and in the process is fed in
particular to a burner. The cooling fluid can therefore
be bled from a compressor in a simple manner and, heated
after a cooling action, can be fed to a burner for the
combustion. All the compressor air can therefore be
supplied to the combustion.
This ensures that the cooling fluid merely flows
through the heat-shield component and is not able to
penetrate into the hot-gas space. Due to this complete
return of the cooling air from the heat-shield
components, mixing of hot gas and cooling fluid accord-
ingly does not occur, so that, if need be, a lower hot-
gas temperature can be set in a gas-turbine plant. This
is associated with a reduction in the nitrogen-oxide
pollution. Due to the closed cooling-air return, there is
likewise no flow around the edges of a heat-shield
component, so that a largely uniform temperature dis-
tribution with low thermal stresses occurs in the
material of the heat-shield component.
The supply of cooling air to the heat-shield
component and the return of the heated cooling air to a
burner of the gas-turbine plant are preferably effected
via axially parallel supply passages. The passages can be
widened as desired in the radial direction and their
cross-sections can be adapted to the requisite cooling-
air quantities. All the heat-shield components therefore
have essentially identical cooling-air inlet conditions.
The flow path to the heat-shield components or of heated
cooling air to the burner is only affected by relatively
slight pressure losses on account of its shortness.
Furthermore, pressure losses no longer occur
owing to the fact that no cooling fluid penetrates into
the hot-gas space. The supply to the heat-shield
components arranged on an outer side of a rotationally
symmetrical component directing hot gas, in particular a
combustion chamber of a gas-turbine plant, is preferably
effected via the guide blades of the first guide-blade
row of the gas turbine. If the quantity of cooling air
which can be directed through the guide blades is insuf-
ficient for adequate cooling of the heat-shield
components, it is possible to direct supply passages past
the outer side of the component directing hot gas, in
particular the combustion chamber.
The return of the heated cooling air is prefer-
ably effected via separate discharge passages which lead
directly to a burner of a gas-turbine plant. It is
likewise possible to lead the outlet passage of the heat-
shield components directly into a main passage in which
the compressor air is fed to the burner. In this way, the
heat absorbed in the heat-shield components can be fed
again to the gas-turbine process in an especially favour-
able manner.
An exemplary embodiment of a heat-shield
component and a heat-shield arrangement in a gas-turbine
plant is given below. In the drawings:
Fig. 1 shows a gas-turbine plant partly cut open in
longitudinal direction and having an annular
combustion chamber,
Fig. 2 shows a longitudinal section through a heat-
shield component having a supporting structure,
a feed passage and a discharge passage, and
Fig. 3 shows a sectional representation of the side
walls of adjacent hollow bodies, which are put
onto a supporting structure.
Fig. 1 shows a gas-turbine plant 10 which is
shown partly cut open longitudinally. The gas-turbine
plant. 10 has a shaft 2 6 and, connected one behind the
other in the axial direction, a compressor 9, an annular
combustion chamber 11 and the blading (guide blades 18,
moving blades 27) . Combustion air is compressed and
heated in the compressor 9, and this combustion air is
partly fed as cooling fluid 4(shown in fig-2) to a heat-shield arrange-
ment 20. The compressed air is fed to a plurality of
burners 25 which are arranged in a circle around the
annular combustion chamber 11. A fuel (not shown) burned
with the compressor air in the burners 25 forms a hot gas
29 in the combustion chamber 11, and this hot gas 29
flows out of the combustion chamber 11 into the blading
of the gas-turbine plant 10 (guide blade 18, moving blade
27) and thus causes the shaft 2 6 to rotate.
In this case, provision is made for the entire
combustion-chamber wall to be lined with the heat-shield
components according to the invention, which have the
form of hollow tiles, or for it to be composed of such
tiles,which are held on a supporting structure outside
the combustion space.
A heat-shield component is schematically shown in
Fig. 2. The heat-shield component as a whole has the
reference numeral 1. It has a hollow body 100, the base
side 101 of which can be exposed to a hot gas. This
("first") base side 101 is exposed to a hot-gas stream
29. The hollow body 100 is laterally defined by the side
walls 102. These side walls 102 are disposed with their
bottom margin on the supporting structure 17. A further
smaller hollow body is located as insert 110 in the
hollow body 100. This insert 110 has passage openings 113
at its base side 111. The insert 110 is laterally defined
by its side walls 112. The side walls 112 are disposed
with their margin on the supporting structure 17. An
interior space 150, which is defined by the insert 110
and the supporting structure 17, is thereby formed. Also
formed in this way is an intermediate space 151, which is
defined by the insert 110, the hollow body 100 and the
supporting structure 17. In the region 162 which is
located between the side walls 112 of the insert 110, the
supporting structure 17 has one or more inlet passages 3,
through which a cooling fluid 4 can pass into the
interior space 150. Furthermore, the supporting structure
17 has outlet passages 5 into the intermediate space 151.
For impingement cooling of the base side 101, cooling
fluid 4 flows through the inlet passages 3 into the
interior space 150 of the insert 110 and passes through
the passage openings 113 into the intermediate space 151,
in the course of which it strikes the inside 103 of the
base side 101. The cooling fluid heated after the
impingement cooling is discharged from the intermediate
space via the outlet passages 5, as indicated by the
arrows in Fig. 2. The cooling fluid 4 is therefore
directed in a closed circuit. This avoids a situation in
which the cooling fluid 4 passes into the hot-gas space
37.
By the attachment of seals 34, it is possible to
prevent leakage flows between the supporting structure 17
and the side wall 102, sitting thereon, of the hollow
body 100. Here, the seals 34 are designed as compression
seals, the side wall 102 of the hollow body 100 having a
shoulder, by means of which the seal 34 is pressed onto
the supporting structure 17 in the region of the connect-
ing point between the side wall 102 of the hollow body
100 and the supporting structure 17.
The cooling fluid 4 is supplied in such a way
that the cooling fluid 4 is fed to the inlet passages 3
from a compressor 9 through a feed passage 12. In this
case, this feed passage 12 lies outside the hot-gas space
37. The cooling fluid 4 is discharged via a discharge
passage 13 likewise lying outside the hot-gas space 37.
The cooling fluid 4 can be fed, for example, to the
burner 2 5 through this discharge passage 13.
In the exemplary embodiment shown, the heat-
shield component 1 is fixed to the supporting structure
17 by a retaining bolt 130. This retaining bolt 130 is
arranged in the centre of the rectangular embodiment
shown. Its axis is oriented along the main axis 32 of the
heat-shield component. In the exemplary embodiment, the
retaining bolt is made with a thickened portion on the
hot side of the heat-shield component 1 and is mounted
with its thinner end on the supporting structure 17. The
retaining bolt may be provided with disc springs (not
shown here) in order to compensate for a situation in
which the permissible thermal expansion of the heat-
shield component 1 is exceeded.
If the insert 110 and the hollow body 100 are
connected in a mechanically detachable manner only via
the retaining bolt 13 0, the inserts can be exchanged for
other inserts which produce another cooling-fluid flow
zone in the intermediate space 35 between the hollow body
100 and the insert 110. The cooling conditions for the
base side 101 of the hollow body 100 can thereby be
adapted to the specific requirements which result from
the position of the heat-shield component 1 in the hot-
gas passage.
Fig. 3 shows a cutaway portion of a heat-shield
arrangement. The heat-shield arrangement is formed from
a plurality of heat-shield components arranged on the
supporting structure 17, only two heat-shield components
100 and 100A being shown for the sake of clarity, in
which case two side walls 102 and 102A of two adjacent
hollow bodies 100 and 100A as well as a part of the
supporting structure 17 can be seen. Here, cooling ribs
on the first base side, which run radially relative to
the side walls 102, are indicated by 115 and 115A. The
base sides 101 and 101A of the heat-shield components 100
and 100A, with the base sides of the heat-shield
components which are not shown in any more detail, form
a wall 160 which can be exposed to a hot gas.
The adjacent side walls 102 of the hollow bodies
100 have a mutually corresponding surface contour. This
surface contour is configured in such a way that the side
wall 102A of the hollow body 100A shown on the right-hand
side in the drawing has a shoulder 105, with which a
mating shoulder 104 of the side wall 102 of the hollow
body 100 shown on the left-hand side corresponds. Due to
this shaping with shoulder 105 and mating shoulder 104,
no linear gap 3 6 leads to the supporting structure 17
from the hot-gas space 37.
This ensures even better protection of the
supporting structure 17 from heating by the hot gas in
the hot-gas space 37. Since the hollow bodies 100 can be
manufactured by the investment-casting process,
geometrical forms such as those described cause no
manufacturing difficulties. It is of course also
possible, for the side walls 102 and 102A of the hollow
bodies 100 and 100A, to select other geometrical forms in
which a linear gap between hot-gas space 37 and support-
ing structure 17 is avoided.
We Claim:
1. Heat-shield arrangement (20) comprising a plurality of heat-shield
components (1) arranged next to one another on a supporting
structure (17), each said heat-shield component (1) being attachable
to said supporting structure (17) and having an outer hollow body
(100) enclosing an insert (110) with an intermediate space (151)
formed between said outer hollow body (100) and said insert (110),
said outer hollow body (100) comprising a first base side (101)
being exposed to a hot gas, and-a-side walls (102), said insert (110)
comprising a side walls (112) and a second base side (111) with a
plurality of openings (113) for the passage of cooling fluid (4) into
said intermediate space (151), the outer hollow body (100) and the
insert (110) in each case being attachable to the supporting structure
(17), and a wall (160) of a component directing hot gas, in particular
of a combustion chamber of a gas-turbine plant, which wall (160)
can be exposed to a hot gas, being formed by the base sides
(101 ,111) of the heat-shield component (1).
2. Heat-shield arrangement (20) as claimed in claim 1, wherein said
supporting structure (17) of each said heat shield component (1) has
in each case an inlet passage (3) for cooling fluid (4) in a first inside
region (162) of the side walls (112) of the insert (110), and an outlet
passage (5) into the intermediate space (151) for cooling fluid (4).
Heat-shield arrangement (20) as claimed in claim 2, wherein said
inlet passage (3) is connected to a feed passage (12), which is
arranged outside the hot-gas space (37), and the outlet passage (5) is
connected to a discharge passage (13), which is like wise arranged
outside the hot-gas space (37).
Heat-shield arrangement (20) as claimed in claim 3 wherein a
compressor (9) is provided for supply of said cooling fluid (4) being
directed in particular to a burner (25) from said heat-shield
component (1) via the feed passage (12) and the discharge passage
(13).
Heat-shield arrangement (20) as claimed in claim 1, wherein said
side walls (112) of the insert (110) can be put on to the supporting
structure (17) in such a way that an interior space (150), which is
defined by the insert (110) and the supporting structure (17), is
formed.
Heat-shield arrangement as claimed in claim 5, wherein said insert
(110) being exchangeable.
Heat-shield arrangement (20) as claimed in claim 1, wherein said
outer hollow body (100) comprises a first outer hollow body (100)
and a second outer hollow body (100A) being attachable next to one
another on the supporting structure (17), so that said side wall (102)
of the first outer hollow body (100) and a side wall (102A) of the
second outer hollow body (100A) are adjacent to one another while
leaving a gap (36), said side walls (102,102A) in each case having a
surface contour such that the gap (36) is winding.
Heat-shield arrangement (20) as claimed in claim 1, wherein said
first base side (101) having a plurality of cooling ribs (115) or
structural elements on its surface (103) facing the intermediate space
(151).
Heat-shield arrangement (20) as claimed in claim 1, wherein said
heat -shield component (1) having a centrally arranged retaining
bolt (130) for fastening to the supporting structure (17).
. Heat-shield arrangement (20) as claimed in any of the preceding
claims, wherein the side walls (102) of the hollow body (100) are
configured to attach a seal (34) relative to the supporting structure
(17)
Heat-shield arrangement (20) as claimed in one of the preceding
claims, wherein the base side (101) of the hollow body (100) is
triangular, hexagonal or four-cornered, in particular quadrilateral or
trapezoidal.
The invention relates to a heat-shield component
(1) having an outer hollow body (100) and an insert (110)
which in each case can be attached to a supporting
structure (17). The outer hollow body (100) encloses the
insert (110) while leaving an intermediate space (151).
The outer hollow body (100) has a first base side (101)
which can be exposed to a hot gas. The insert (110) has
a second base side (111) having a plurality of openings
(113) for the passage of cooling fluid (4) into the
intermediate space (151) for impingement cooling of the
first base side (101). The invention also relates to a
heat-shield arrangement (20)

Documents:

01454-cal-1998-abstract.pdf

01454-cal-1998-claims.pdf

01454-cal-1998-correspondence.pdf

01454-cal-1998-description (complete).pdf

01454-cal-1998-drawings.pdf

01454-cal-1998-form 1.pdf

01454-cal-1998-form 2.pdf

01454-cal-1998-form 3.pdf

01454-cal-1998-form 5.pdf

01454-cal-1998-gpa.pdf

01454-cal-1998-letter patent.pdf

1454-CAL-1998-(12-10-2012)-FORM-27.pdf

1454-CAL-1998-FORM-27.pdf

1454-CAL-1998-OTHER PATENT DOCUMENT.pdf


Patent Number 211014
Indian Patent Application Number 1454/CAL/1998
PG Journal Number 42/2007
Publication Date 19-Oct-2007
Grant Date 16-Oct-2007
Date of Filing 14-Aug-1998
Name of Patentee SIEMENS AKTIENGESELLSCHAFT
Applicant Address WITTELSBACHERPLATZ 2, 80333 MUENCHEN
Inventors:
# Inventor's Name Inventor's Address
1 HEINRICH PUTZ WELLERSCHEID 2, D-53804 MUCH
PCT International Classification Number F 23 R 3/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 29714742.0 1997-08-18 Germany