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Oct. 1, 1946.
Filed Julyäl',- »1944
' A2 sheets-Sheet 1.
Octyl, 1946.
_ E, HAR-l1
2,408,637' '
Filed July 5l, 1944
2 Sheets-Shee‘kf 2
BW if@
Patented Oct. 1, 1.946 f
UNITED « >_s'l‘irrs’s PATENT formes
Edward Hart, San Marino, Calif., assignor to A. 0.`-~
Smith Corporation, Milwaukee, Wis., a corpo
ration of NewYork
Applieatión July 31, 1944, Serial No. 547,423',> "
f2 claims. » (ci. loss-10s)
rvaway vand sectioned showing the. right hand .end
This invention relates to kdouble casing high
pressure pumps of the multi-stage rotary >iin
„ peller type wherein the vpump housing `for the
of the pump; and
y impellers is of cast construction embodying pas
Fig- 2 is a similar section throughthe left'hand
The pump comprises* a' cast lpump housing I
having a rotaryV shaft 2 extending longitudinally
axially thereof. The left hand end of housing
I is bolted to- the cover plate 3. and the right >hand
sages and volutes giving. a high efliciency to the
pump,.and wherein an .outer c_as_ing surrounds
thepump housing and is adapted tocontainfluíd
>under pressure to support the pump housing
end has a slip joint sealed by the annular ring
against tension stresses resulting from the com
pression of the fluid therein. 'I‘he fluid in the 10 5 and centering the housing in a separator piece
forming the inner Wall of a ysuction chamber in
casing is usually pumped :Iluid which is under
the endr housing 4. End housings >tare .bolted
_the same pressure as the ñuid being dischar-ged
to cover plate 3 and housing 4, respectively, and
contain bearings for the ends of the pumpshaft
. Heretofore, the outer ca‘sings for such pumps
have been of cast or similar construction requir 15 2. The shaft extends through the end of one kof
>the housings 6 to be driven> by any suitable
ing heavy walls to withstand »the high internal
~ '
fluid pressures.
Where corrosion was likely,
TheA housing I containsV the impellersA-.l seh
either the metal of the casing throughout its
cured on .the shaft 2' in volute >chambers 8.1111 ¿the
thickness had to be` of an expensive corrosion
resistant alloy, or else an added weight of some 20 housing. As manyimpellers ‘I may belemploy'ed
as> desired Within “the limits of` proper' shaft
alloy sheet liner >.had to be inserted therein and
alignment and support, the pump illustrated
properly vsealed against leakageiof 4fluid behind
having ten impellers and being a ten-stage.~ pump.
the same. Such pumps were expensive and heavy
The inlet for the pump is` provided in en’d'hous
in Weight, detracting from ytheir commercial ap
26 ing 4 Where the lateral intake 9 supplies fluid
to a throated circumferential chamber I0 lead
Y . The object of the present invention is to great- y
ly reduce the cost of such pumps and to lighten ’ ing. to the first stage impeller Il. From impeller
I I the fluid is directed through passages in hous
the'iweight‘o‘f‘ theV same so that they may be em
ing I to successive stages until it is ñnally'vdis
ployed'more readily in competition with other
charged through the central port I2 in the side
types of pumps.
of the pump housing.
According to the invention the outer casing
In construction, the end housing 4 has a cir
is composed of a number of relatively thin layers
cular flange I3 thereon for Welding to the end
of metal superimposed and welded along one or
Vof the outer cylindrical casing I4 by thearc de
more longitudinal seams and Welded to end ilange
posit I5. The cover plate 3 is bolted to an end
members or closures for supporting the pump 35 ñange member I6r Welded to the opposite end
therein. Where corrosion is encountered, the
of the casing I 4 by the arc deposit I 1. Welds
inner layer is constructed of suitable corrosion
I5 and I'I serve to secure _the members longi
resistant alloy While the remainder may be of
tudinally and the bolted end plate 3 and liange
less costly steel, all of the layers being'utilized
for the retentionv ofthe pressure fluid.
Expensive casting operations yfor the casing
I6 provi-de for assembly of the pump.
In .accordance with the invention, the casing
I4 is constructed of a plurality of layers of rolled
plate formed into superimposed cylindrical lay
are eliminated, and due to the higher quality
ers to provide a multi-layer construction in which
of rolled stock of relatively. thin plates, the total
wall thickness and Weight of the casing is con 45 each layer is in uniform pressure engagement
With its adjacent layervor layers.
sidera-bly reduced. The layers are fabricated
‘ In constructing the casing, the first layer I8 is
in tight contact to effectuniform stress distri
ñrst formed by rolling or pressing a i‘lat plate
bution therein, While the flexibility of the sev
to cylindrical shape and the longitudinal seam is
eral layers provides, a structure more kfree from'
fabrication stresses and more reliable in the con 50 welded, as by an arc deposit I9. Subsequent
layers 20' are similarly formed and then applied
ñning of the pressure ñuid.
either successively or at one time and tightened
The accompanying drawings illustrate an em
upon the inner layer by tension bands and then
bodiment of the invention.
Welded along the longitudinal seams 2I. As
In the drawings:
Figure 1 is a side elevation with parts broken 55 many _subsequent layers may be applied as may be
necessary to provide a cylinder capable of with
standing the fluid pressures involved, having re
gard to the thickness of the layers and the
strength of the metal. The drawings show four
layers 20.
In practice the layers should range between
one-eighth and one-half inch in thickness in
order that they be assured of proper quality of
steel. The relatively thin plates are readily
formed and applied without danger of internal 10
head secured to said flange, aligned bearings
carried by said heads for a pump shaft, a pump
enclosed in said casing and having a rotary shaft
extending therethrough and mounted in said end
bearings, a plurality of impellers mounted on said
shaft and operative in series to provide a high
pressure discharge for the vpumped fluid, said
vpump being supported at its ends only by said end
heads and being continuously and radially spaced
stresses from fabrication, and the shop equipment ,
for constructing the casing from such layers-is
simple and inexpensive. Furthermore, the rela‘tively thin layers provide a structure which is
welded to said casing at one end and a flange
welded to the casing at the other end, an end
from said outer casing to provide a closed cham
Iber therebetween for substantially the full length
y of the pump, and a lateral discharge outlet welded
highly flexible to stresses and which effects »a‘ 15 to saidfcasing.substantially centrally thereof in
ready and uniform ‘distribution of the working
alignment with the discharge port of the pump
_and connecting »with the space between said pump
The inner layer I8 may be of non-corrosiveandfcasing to dispose fluid in Said space under
alloy of a composition known to be resistant to
circumferential and longitudinal pressure pro
attack from the fluid being pumped, and is welded 20 tecting the pump against internal fluid pressures
into the structure in a manner adapting it to
duringoperation of the pump.
take its share of stress under working loads,
2. In a double casing high pressure pump of
along with the other layers.A
the class described,l an outer cylindrical casing
The casing I4 has a central discharge outlet i2
>constructed of a plurality of superimposed layers
disposed in alignment with the loutlet port I2 of 25 of rolled metal plate welded in close pressure en
the pump housing I. The space or chamber 2t
gagement with one another for withstanding high
between housing I and casing III serves to- retain
internal fluid pressures, anLend head providing an
pumped fluid under pressure from said outlet I2
inlet to said pump for fluid to be pumped welded
and to thereby surround the pump housing I dur
yto the end ofthe casing and another end head
ing operation with fluid under pressure.
.30 >removably secured to the casing, a pump enclosed
By reason of the protection of housing I by
in said casing and havinga rotary shaft extend
the external vfluid pressure the housing can be
ing-therethrough and mounted in said end heads,
thinner and much lighter in weight, thereby mak~
a plurality of impellers mounted on said shaft and
ing the casting of it less expensive and its han
operative in series to provide a high pressure dis
dling during machining and fabrication of the
charge `for the pumped fluid, said pump being
pump less difficult.
supported only by said endV heads and being con
The outer casing withstands both the longi
tinuously and radially spaced from said outer cas
tudinal and circumferential pressure of the fluid,
ing throughout substantially the full length of the
thereby relieving the pump housing of all ten
pump, and means comprising a discharge outlet
sion stress during operation of the- pump.
l40 disposed substantially centrally of the casing and
The invention may have various embodiments
connecting with the space between said purnp and
within the scope of the accompanying claims.
casing to provide fluid between the pump and
I claim:
casing under a circumferential and longitudinal
1. In a double casing high pressure pump of
pressure equal to the pressure of the fluid at
the class described, an outer cylindrical casing » 45 said discharge to protect the pump against in
constructed of a plurality of superimposed layers
ternal fluid pressures during operation of -the
stresses throughout the same.
of rolled metal plate welded in close pressure en
gagement with one another for withstanding high
internal fluid pressures, a lateral intake head
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