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Патент USA US2128805

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Filed Sept’. '11, 1957
mm ‘
Inventor": '
John H. Devan,
His Atfoor‘ney '_
Patented Aug. 30, 1938 -
John H. ,Doran, Scotia, N. Y., assignor to General‘
Electric Company, a corporation of New York
‘ Application September 11, weasel-in No.1d3,5il4
5 Claims. (Cl. 253-39)
a supporting arm is of I-beam tormation having
Elastic ?uid turbines in order to withstand the
high pressures to which they are subjected have
relatively massive casings. On account of the
hightemperature of the operating ?uid, move
5 ments of the casing both axially and radially
take place due to expansion and contraction
from cold to hot and vice versa. Such move
ments are usually greater in an axial than in a
radial direction.
The eilects of temperature
10' changes are particularly noticeable at the inlet
or high pressure end of the turbine, the low pres
sure end being anchored. Because such move
ments cannot be prevented, it becomes ‘imPOré
tent to provide means for supporting the casing
15 in such manner that as said movements are tak
ing place and after they are completed, proper
alignment of the parts is preserved.
The object of my invention is the provision of
an improved means or arrangement of parts
which permits the casing of an elastic ?uid
turbine freely to expand and contract. both
axially and radially and at the same time pre
" serves the proper alignment of them-operating
parts and prevents distortion of the casing.
For a consideration of what I believe to be
novel and my invention, attention is directed to
the accompanying specification and the claims
appended thereto.
In the attached drawing, which is illustrative
of my invention, Fig. 1 is a perspective end view
of a turbine and its support; Fig. 2 is a view in
elevation of a slightly modi?ed form of support,
and Fig. 3 vis a detail showing how the lever
arms of the supporting members are connected.
a relatively thin web 8 extending at right angles
to a plane passing vertically through the axis
of the turbine. Each member is rigid in a ver—
tical plane so as to support the weight of the
turbine without ?exing. The upper end of the
web has an enlarged integral head 9 forming a
seat for a supporting arm of the casing, said
seat and arm being united by suitable means, as
for example bolts ill. The bottom end of the 10
web is provided with an enlarged integral foot
ii, the web gradually increasing in width in a
transverse plane from the head to the foot. The
form or shape of each member is such that the
web will bend or yield by the necessary amount
when the turbine casing expands'and contracts -
in the direction of its axis but is rigid against
sidewise movements so that the anal alignment
of the turbine is preserved.
The radial‘ expansionand contraction of the
axial expansion and contraction thereot never
theless has to be taken care of. To this end,v
the base, bed plate or support it has what in ef
fect constitutes a knife edge pivot or fulcrum it
for each member. Because the weight of the
turbine would tend to crush a true knife edge,
the pivot is rounded at upper end so as to give
a greater area of support. A pivot or fulcrum.
is located in a seat id formed in the foot ll of
each member and extends in the same direction
as the axis oi the casing. Such a construction
permits the members to tilt by the very small
but necessary amount when the casing expands »
In the drawing, 3 indicates the high pressure
and contracts radially. The‘ arrangement of the
pivots l3 and seats it also permit the members
end of the casing of an elastic ?uid turbine, the
parts of which may be of any suitable construc
as a‘ whole, where necessary or desirable, to slide
. tion.
Extending forwardly from the high pres
sure end of the casing andparallel to the axis of
40 the shaft of the turbine rotor are two relatively
massive arms or extensions 5 and 5 which sup-
port the front end 01.’ said casing and of the parts
turbine casing while appreciably less than the
back and forth as the casing expands and con
tracts but in manyv cases the vertical webs 8
will bend sumciently for the purpose. To ensure
equal movements of the members, as distin-'
guished from permitting one to do all or a greater I
part of the tilting and thus cause objectionable
contained therein. The rear or low pressure end disalignment of the front end or the turbine cas
of the casing may be supported in any suitable l ing with respect to the rear or low pressure end,
the two members are pivotally connected.v This
45 or known way. The temperature of the low pres
sure or exhaust end of a turbine when operat
is accomplished by providing each member with’ "
ing condensing, as most large turbines do, is a lever arm l5 and connecting the two arms by
relatively low, and does not change greatly with a pivot It. ‘
changes in load, and for that reason it is entirely
Referring to Fig. 2, the same general construc
practical to ?rmly anchor the exhaust or cold tion as that referred to above is followed but
end and take care of expansive movements at with the following diderences. ‘Instead of hav
the inlet or hot end as in the present case. Un
ing the relatively‘larg'e-?at surfaces of the cas
der the arms 4 and 5 are located supporting mem
ing arms 5 rest‘f-directly on the heads 9 of the’
bers 6 and ‘I each of which forms a bell "crank members, there are interposed metal supporting
55 lever. The part of each member directly under
5 ,
strips I‘! of‘ substantially smaller surface arm.
Because the supporting strips are narrower than
the arms, they in e?ect form fulcra and permit
of a limited tilting oi‘ the members.
Instead of using knife edge supports iii and
seats l4 therefore, as in Fig. 1, narrow supporting
strips I 8 are substituted therefor and holding
down bolts is provided, the latter being secured‘
in the bed plate 82. The narrow supports in
in a plane perpendicular thereto, fulcrum sup
ports for the members carried by the base per»
mitting the members to tilt as the casing expands
and contracts radially, and means connecting the
members in a'manner to cause equal tilting move
ments thereof.
2. An elastic ?uid turbine having a casing. parts
of which move both axially and radially in re
sponse to temperature changes. a base, extensions
10 effect form fulcra and; permit of the necessary
- on.the casing at the hot end thereof on opposite 10
tilting movement of the members to compensate sides of its axis, a supporting member located
for radial expansion of the turbine casing. The ‘ under each extension and secured thereto for
axial expansion of the casingmay be taken care
of by the bending of the webs ii or the bolts to
may be so adjusted and arranged as to permit
movement of the members on the base or bed
plate if: or a combination of both features may
be employed.
In Fig. 3 is shown a. suitable arrangement for
.20 connecting the lever arms iii of the supporting
members and is equally applicable to the struc
tures of Figs. 1 and 2. On opposite sides of one of
the arms is secured a pair of plates it by bolts
28 and desirably in addition by a welded joint 22.‘
25 The other arm is made to .fit between the plates
and the parts so ?tted are united by a pivot pin
23 having suitable means at its ends to hold it
sustaining a part of the weight of the casing and
preserving its alignment as it expands and con
tracts in an axial direction, and means located 15
between the base and the members permitting
the latter‘to tilt- ln response .to radial expansions
of the casing.
3. An elastic ?uid turbine having a, casing,
parts of which move both axially and radially in 2%
response to temperature changes of the operating
?uid, extenslonson the casing located on opposite
sides or" its axis, a, supporting member under each
extension and secured thereto, said members being
rigid in a vertical plane and movable in the direc
tion of the axis of the casing and also ina plane
transverse thereto, means connecting the mem
in place.
. hers so that movements thereof due to radial ex
Since the internal mechanism of the turbine pansion of the casing are equalized, and a base
30 ‘forms nopart of the present invention, it has been ’ common to and supporting said members.
omitted but it is to be understood that it can be
4. An elastic fluid turbine having a casing, parts
of any suitable type. The front end bearing for
the rotor is mounted in the forwardly extending
part 24 offthe casing so that the entire mass at
‘as the front end is supported by the members t and
It must be understood that the movements of
the casing due to heat changes are small, so small
in fact that usually it is only by accurate measure
40 ments that the extent thereof can be determined.
Since expansive movements of the casing clue to
temperature changes cannot‘ be prevented, the
only thing that can be done is to provide support
ing, guiding and directingmeans capable of pre
45 serving the proper predetermined alignment of
the casing anclits parts with respect to some fixed
The means described above permit the
desired results to be secured.
What I claim as new and desire to secure by
50 Letters Patent of the United States, is:
1. An elastic ?uid turbine having a casing, parts
of which move both axially and radially in re
sponse to temperature changes, a base, a pair of
of which move both axially and radially in ‘re
sponse to temperature changes of the operating
?uid, a base, extensions secured to the casing at
the hot end thereof and located on opposlm sides
of its axis, a pair of members fulcrumeol on the
base and engaging the extensions to support the »
weight of the casing, each of said members forming a bell crank lever, and. means uniting cor
responding lever arms of said members in a man 40
nerto equalize their movements in a direction
perpendicular to the axis of the casing.
5. An elastic ?uid turbine having a casing. parts
of which move both axially and radially in re
sponse to temperature changes of the operating 45
?uid, a; base, a pair of members supported on the,
base, each having a head engaging the casing, a.
foot and'a web connecting the heat and foot, said
web extending transversely to the axis of the cas
ing and being rigid in a vertical plane and yield
able in an axial direction, and fulcra for the mem
bers supported by/the base and extending paral
members extending transversely to the axis of
lel to each other and to the axis of the casing
the casing and secured thereto for supporting a
part of the weight thereof and preserving the
axial alignment of the casing as it ‘expands and
contracts in the direction oi’ its length, said mem
tilting toward and away from each other as the
bers being yieldable in an axial direction and rigid
ancl'co-operating with said feet, said members
casing expands and contracts radially under tem
perature changes.
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