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Патент USA US2111878

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March .22, 1938.
H. VAN TONGEREN
12,111,873
‘MEANS FOR DRAINING MOISTURE FROM STEAM IN STEAM TURBINES
' Filed June 26, 1956
F163 \
FIE-3.4
FIGS
Patented Mar. 22, 1938
2,111,873
UNITED STATES PATEEV‘QET 'QFFIQEA
2,111,878
MEANS FOR DRAINING MOISTURE FRQM
- STEAM IN STEAM TURBINES
Hermannus van Tongeren, Heemstede,
Netherlands
7 Application June 26,
1936, Serial No. 87,566
In the Netherlands July 2, 1935
3 Claims.
(Cl. 253-76)
This invention relates to means for draining
moisture from steam in steam turbines.
It is well known that in steam turbines, and
the water droplets are radially thrown off. Sur
rounding said drip rim, the inner face of easing
especially in the low pressure stages thereof, part
chined therein. As shown, the depth of said
groove is greatest in the radial plane passing
5 of the steam is condensed and that the water of
condensation thus formed has a deteriorating
action on the blades. The principal object of my
invention is an improved construction whereby
the water droplets, which are thrown by cen
10 trifugal force from the rotor or rotors, are col
lected--and thereafter discharged from the oas—
ing-in such a manner that they cannot possibly
return into the blading.
‘ With this object in view, I suggest to provide
a circumferential groovein the inner wall of the
casing, said groove being so disposed relative to
the corresponding rotor that the droplets thrown
radially outwards vfrom the rotor can reach the
body of water already present in the groove with
out contacting with any stationary part of the
turbine. Since the body of water in the groove,
owing to the impacts of the droplets thrown
thereinto, has a circumferential speed not essen
tially smaller than that of the droplets, the latter
N2 in will be caught thereby without considerable re
bounding.
It will easily be understood that such
a gyrating mass of water surrounding the rotor
is much better adapted to catch and hold the
droplets than are stationary solid walls.
In order that- my invention may be more fully
2 has a circumferential collecting groove ‘I ma
through the drip rim, i. e. on the outlet side of
the moving blades, and gradually decreases to
wards the radial plane passing through the inlet
side of said blades. Through a small portion of
the circumference, the sloping side wall of the
groove 1 is recessed so as to form a sill II] located
at a somewhat smaller distance from the turbine
axis than the bottom of the groove. Secured to
said sill as by screws 8a is a nozzle 8 ?tted at
the inner end of a passage 9 provided in the wall 15
of the casing 2 and serving to discharge water
collecting in the groove.
When the turbine is in operation, the groove ‘I
will after a certain period of time be ?lled with
a gyrating, annular body of water, the more or 20
less cylindrical inner surface of which will be
substantially flush with the sill Ill. Any water
?owing over said sill ‘will be forced by its kinetic
energy into the nozzle 8 and thus be discharged
through the passage 9.
25
Figs. 3, 4 and 5 clearly show that any droplet
thrown radially off the drip rim 6 will reach the
level of the gyrating body of water in groove 1
and thus be caught and held by said water, with“
out coming into contact with the radial right
understood by those skilled in the art, I shall
hand side wall of said groove or with any other
now proceed to describe the same in further de
stationary part of the casing.
tail with reference to the annexed drawing, in
which:
It is not necessary to provide every rotor ele
ment traversed by more or less wet steam with
a draining device as described. For instance, a
Fig. 1 is part of an axial section of an axial
flow turbine,
group of rotor elements or blade wheels, only the
.
Fig. 2 shows part of a cross-sectional view of
‘ said turbine, along the line II--II in Fig. 1,
last wheel on the outlet side of such group to»
Figs. 3, 4 and 5 illustrate parts of axial sections
40 along the lines III--I1'I, IV—IV and V—V, re
spectively, in Fig. 2,
such wheel may be provided with a draining
device.
Figs. 6-10 of the drawing illustrate another
embodiment of my invention, wherein the butt
strap II is provided with two drip rims I2 and
Fig. 6 shows a modi?cation as part of an axial
section of another axial flow turbine,
Fig. 7 is part of a cross-sectional view of said
turbine, along the line VII—VII in Fig. 6, and
Figs. 8, 9 and 10 are parts of axial sections
along the lines VIII—VIII, IX-~IX and X--X,
respectively, in Fig. 7.
'
‘
In‘Figs. 1-5, a rotary blade wheel is desig
nated by I, the turbine casing by 2. The nu
merals 3 and 4 indicate normally shaped ?xed
guide blade rims on either side of wheel I. The
butt strap or sealing ring 5 of the moving blades
is provided, on the right hand side, i. e. on the
outlet side, with a drip rim or edge 6, from which
gether with the part of the casing surrounding
I3 on the inlet and on the outlet side, respec
tively. Said drip rims are surrounded by water
collecting grooves I4 and I5, respectively, ma
chined in the turbine casing 2. Also in this case
the depth of each groove is greatest in the radial
plane of the corresponding drip rim. The grooves
are separated from one another by an annular
ridge I6, which through a small portion of its
length is recessed to form a sill II, to which the
nozzle 8 of the discharge passage 9 is secured by
screws 8a.
Secured to the inner face of the ridge I6 is a 55
2
2,111,878
flat ring l8, the side edges of which are suitably
spaced from the opposite radial walls of the
grooves 14 and I5, respectively, so that any drop
lets thrown from the drip rims I2, I3 can freely
pass through the narrow slots thus formed with
out coming into contact with said walls.
The strap l8 acts as a shield or baf?e having
for its effect greatly to reduce the circumferen
tial speed of the steam carried along by the butt
strap I I.
Owing thereto, the levels of the bodies
of water in the grooves I4, l5 are not seriously
disturbed by wave motion.
What I claim is:—
1. In a steam turbine, a casing, a rotor ele
15 ment provided with a radially directed drip rim,
a circumferential water-collecting groove in the
inner wall of the casing situated in radial align
ment of said drip rim and with its bottom spaced
from said rim and a water-discharging conduit
20 opening into said groove substantially level with
said drip rim, the groove being so disposed and
formed as to permit water droplets thrown by
centrifugal force from said drip‘ rim to collect in
said groove thus providing an annular body of
water and to prevent said droplets from being
thrown into direct contact with any stationary
solid Wall.
2. In a steam turbine, a casing, a rotor ele
ment provided with a radially directed drip rim,
ment of said drip rim and with its bottom spaced
from said rim and a water-discharging conduit
opening into said groove substantially level with
said drip rim, the groove being so disposed and
formed as to permit Water droplets thrown by
centrifugal force from said drip rim to collect in
said groove thus providing an annular body of
Water and to prevent said droplets from being
thrown into direct contact with any stationary
solid wall, and an annular ba?le secured to the 10
casing partly closing said groove leaving only a
narrow circumferential slot in the radial plane
of said drip rim.
3. In a steam turbine, a casing, a rotor ele
ment provided with a drip rim at its inlet and 15
outlet sides, a circumferential water-collecting
groove in the inner wall of the casing opposite
the inlet and outlet sides of said rotor element
and in radial alignment with the respective drip
rims, a circumferential ridge intermediate of said 20
grooves, a recess in said ridge forming a sill and
a Water-discharging conduit opening in said sill
substantially level with the drip rims, the grooves
being so dispose-d and formed as to permit water
droplets thrown by centrifugal force from the
respective rims to collect in the respective grooves
thus providing annular bodies of water in the
bottoms of the grooves, said droplets not coming
in direct contact with any stationary solid wall.
a circumferential water-collecting groove in the
inner wall of the casing situated in radial align
HERMANNUS VAN TONGEREN.
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