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Патент USA US2410810

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NQV. 12, 1945.
v. CRQNSTEDT
2,410,810
DIAPHRAGM CONSTRUCTION FOR TURBINES
’
Filed July 23, 1943
_
5 Sheets-Sheet 1
FIG.
Nov. ‘12, 1946.
V. CRONSTEDT
' 2,410,810
DIAPHRAGM CONSTRUCTION FOR TURBINES
.
Filed July 23, 1943
s Sheets-sheaf 2
Nov. 12, 1946.
v. .CRONSTEDT
2,410,810
DIAPHRAGM CONSTRUCTION FOR TURBINES
'
Filed July 23, 1943
3 Sheets-Sheet 3
Patented Nov. 12, 1946
2,4l0,8l0
UNITED STATES PATENT‘OFFICE
2,410,810
DIAPHRAGM CONSTRUCTION FOR
TURBINES
Val Cronstedt, Marlboro, Conn, assignor to
United Aircraft Corporation, East Hartford,
Conn, a corporation of Delaware
Application July 23, 1943, Serial No. 495,931
5 Claims.
(01. 253—78)
1
2
This invention relates to turbines and particu
larly to the aligning of the split sections of the
turbine diaphragms.
casing ring has, in addition to the nozzles, a disc
When a turbine is made up of several rows of
diaphragms with nozzles, alternating with rows
of rotating blades, the diaphragms are generally
split to permit assembly of them with the rotor
on which the blades are mounted.
The inner
portion of the split edges cannot be reached for
fastening after assembly to the rotor. A feature
of this invention is the maintenance of alignment
of the edges of the diaphragms. This is particu
larly desirable in gas turbines subjected to large
temperature variations.
Many turbines carry sealing rings at the inner
edge of the diaphragm. Another feature of the
‘invention is the support of these sealing rings in
the diaphragm. The co-pending application of
Cronstedt and Ledwith, Serial Number 486,619
?led May 11, 1943, shows a turbine in which the
casing is made up of a number of rings, each of
which has an integral diaphragm. A number of
these casing rings are split for assembly purposes,
and the outer edges of adjoining rings are con
nected to form the casing. A feature of this in
vention is the use of stepped pins at the inner
edge of each diaphragm to hold the opposed
halves of each casing ring in alignment.
Other objects and advantages will be apparent
from the speci?cation and claims, and from the
accompanying drawings which illustrate what is
now considered to be a preferred embodiment of
the invention.
‘
'
Fig. l is a sectional view through the turbine.
Fig. 2 is a transverse sectional view on line 2—2
of Fig. 1.
Fig. 3 is a sectional view through the front
casing ring of Fig. 2 along line 3—-3.
The turbine shown includes a casing to built
up of rings I2, M, l6 and I8 supported by radial
pins 20 in a housing 22 and engaging bores in
bosses 24 in the casing. These pins are all in sub
stantially the same plane and constitute the sole
support for the casing. A shaft 26 with rows of
‘blades 23 thereon rotates in proximity to nozzles
46 which extends inwardly from the row of noz
les. This disc carries at its inner edge a sealing
ring 68. The nozzles in adjacent diaphragms
alternate with the rows of blades on the shaft.
Casing rings I4, l6 and I8 are split on radial
planes, bolts 50 holding the halves of each split
ring together at its outer periphery. The planes
of the splits of adjoining casing rings may be
staggered as shown in Fig. 2.
To maintain the sections of each split casing
ring in alignment, disc 46 is provided with bores
52 which receive aligning pins 54. The bores 52
are located where the casing rings are split so
that a part of each bore lies in each half of the
disc forming opposed recesses which, when the
ring sections are assembled, receive the pins, thus
aligning the discs radially against distortions.
Disc 46 may have a radially extending groove
56 in its inner edge intersecting bores 52. Each
pin has an enlarged central portion ?tting within
the groove and engaging opposite side walls of
the groove to hold the parts of the diaphragm in
axial alignment.
This groove 56 may receive a peripheral ?ange
58 on sealing ring 48 in which case the ?ange will
have an opening 60 to receive the enlarged por
tion of each pin. As best shown in Fig. 2, the
sealing ring is also split diametrically and is as
sembled with its split out of alignment with the
split in the casing ring further to steady the
diaphragm.
It is to be understood that the invention is not
limited to the speci?c embodiment herein illus
trated and described, but may be used in other
ways without departure from its spirit as de?ned '
by the following claims.
I claim:
1. Means for aligning the split sections of a
turbine diaphragm, each section having opposed
recesses therein, said means including a pin ?t
ting in said recesses, said pin extending aXially
of the diaphragm, and having an enlarged part
engaging laterally with the diaphragm to hold
the pin against endwise movement relative to the
diaphragm and to hold the halves of the dia
phragm in alignment.
Housing 22 has a head 34 which forms a part
2. Means for aligning the split sections of a
of the housing and supports a bearing sleeve 36
turbine diaphragm, each section having opposed
for the front end of shaft 26. At the other end 50 recesses therein, said diaphragm also having a
of the turbine, housing 22 has a spider 38 within
groove in its inner surface with which the re
which is a bearing 40 for the shaft. The spider
cesses intersect, and a seal having a ?ange over
has a number of legs 42 engaging radial pins 44
lapping the inner periphery of the diaphragm,
in the housing,
said means including a pin engaging the opposed
The diaphragm 32 which is integral with each 55 recesses and having an enlarged part ?tting in
30 forming part of the diaphragms 32 integral
with the casing rings.
,
2,410,8i6
3
4
,
‘
aligning pin engaging the recesses in the (liai
phragm and the ?ange of the seal, said ?ange
having an opening to receive the pin, said pin
having an enlarged portion ?tting in said groove
turbine diaphragm, each section having opposed
recesses therein, said diaphragm also having a en and engaging laterally with the walls of the
groove for’ maintaining alignment of the dia
groove in its inner surface with which the re
the groove, said ?ange having an opening with
which a part of the pin engages.
3. Means for aligning the split sections of a
cesses intersect, and a seal having a ?ange in
said groove, said means including a pin engaging
the opposed recesses and having an enlarged part
?tting in the groove and engaging opposite side"
walls of the groove, said ?ange having an opening
with which the enlarged part of the pin engages.
4. A split turbine diaphragm having opposed
sections in the adjoining edges of which are re
cesses, said diaphragm also having an annular
groove in its inner periphery, a seal having a '
?ange in said groove, and an axially extending
phragm.
_
5. A split turbine diaphragm having opposed
sections in the adjoining edges of which are re
eesses, said diaphragm also having an annular
groove in its inner periphery, a seal having a
flange in said groove, and an axially extending
aligning pin engaging the recesses in the dia
phragm and the ?ange of the seal, said seal being
split and having its line of split out of alignment
with the line of split of the diaphragm.
VAL CRONSTEDT.
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