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Патент USA US3043238

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July 10, 1962
Original Filed May 27, 1957
6 6.
United States Patent
- Patented July .10, 1962
Referring more particularly to the drawings,.FIGUR_E
1 shows the preferred form of, the heavy walled twm
volute pump comprising a volute casing 1 of unitary
construction, characterized by its spiral or scroll-like con
formation and further provided with heavy walls gen
Hubert C. Atwood, In, West?eld, and John G. Williams,
Spring?eld, N.J., a'ssignors to Worthington Corpora
tion, Harrison, N.J., a corporation of Delaware
Original application May 27, 1957, Ser. No. 661,656, now
erally designated 2 having an opening 20 communicat
ing with chamber 21, in which an impeller 3 is rotatably
mounted for pumping the liquid, from the axial Suction
inlet 4, formed in the front wall thereof, through dis
Patent No. 2,955,540, dated Oct. 11, 1960. Divided
and this application May 9, 1960, Ser. No. 27,914
2 Claims. (Cl. 103-103)
10 charge outlet 5.
One manner of associating the bootlike splitter is
This invention, a division of application No. 661,656
?led‘May 2.7, 1957 now United States Patent 2,955,540,
shown and it is not intended to limit the invention to
this construction as other methods of association will be
readily apparent to those skilled in the art.
15 ' Thusly, the bootlike splitter 8 is shown as having side
walls 11 and 12 which provide a U-shaped con?guration
Twin volute pumps are generally used in applications
and coact with the. casing to divide ?ow passingthrough
requiring balanced ‘radial forces and have been manu
relates to a centrifugal pump and in particular to a heavy
walled twin volute pump provided with a separate
the volute into the substantially equal ?ow passages 6
factured, heretofore, by casting the splitter element as an
integral part of the volute casing.
and 7.
Pumps for high pressure application require thick 20
Walled vcasings, but the splitter should remain thin for -
hydraulic reasons, and cost ‘of metal involved.
In order to effectively cast a twin volute pump cas
An opening 22 is formed by the portion of the stripper
disposed adjacent the suction inlet 4 and an opening 23
is formed by the portion of stripper 8 disposed adjacent
opening 20 in the rear wall of the casing.
It will be
evident that opening 20 is formed, as shown in the draw
ing, it is imperative that the thickness ‘of the casing and
the splitter be substantially equal; the equality in thick 25 ings, to permit easy insertion and disposition of stripper
8 in operative position. The suction inlet 4 and open
ness being necessary to prevent ?aws in the casting,
ings 20, 22 and 23 are shown as in axial alignment
which ?aws occur because of the unequal cooling time
which facilitates assembly of the components of the pump.
in a respective heavy casing and thin splitter cast integral
Locater means taking the form of tapped holes 9 and
Casting the splitter as an integral part of the twin 30 drilled holes 10 are provided respectively in the walls of
the casing 1 and accommodate the splitter in operable
volute pump casing for a high pressure application pre
sents other di?iculties; for example, twin volute pumps
In assembly the splitter 8 is disposed so that the walls
for high pressure applications undergo rigorous inspec
11 and 12 thereof are contiguous to the walls 13 and 14
tion tests such as a radiographic examination of the cast
ing to determine whether there are ?aws therein, search 35 of the casing and openings 17 in wall 11 are aligned
with the tapped holes ‘9. Similarly tapped holes 15 in Wall
ing through two separate layers of metal, as is the case
12 are aligned with drilled holes 10. Bolt means 16
in a twin volute having an integral splitter, not only de
may then be inserted to connect the splitter 8 to the
tracts from the et?cacy of the test, but also adds to the
walls of the casing as above described to divide the
expense of such inspection.
volute casing 1 into two substantially equal portions.
In many cases the integral splitter fails during hydro
With the provision of a separate splitter element appli
static leak test. Failure results from the weakness in
cant discloses a twin volute pump that is characterized
the casting at the point where the thin splitter joins the
by the substantial minimization of the problems herein
heavy walled volute.
before mentioned. -It will be understood that the in
Flaws detected during inspection of the casting are
usually repaired, by a manner well known in the art. 45 vention is not to be limited to the speci?c construction
or arrangement of parts shown, but that these may be
Howeventhe ?aws so detected, due to the inaccessibility
widely modi?ed within the invention de?ned by the
of certain portions of the casing which results from the
splitter being cast integral therewith, sometimes cannot
What is claimed is:
be repaired and as a consequence the casting is discarded.
Some installations require volute pumps capable of 50 '1. In a centrifugal pump of the twin volute type, a
heavy walled casing of unitary cast construction having
contending with extremely high pressures and, in addi
a front wall including a suction inlet, said casing in
tion, require a higher ?nish on the inner periphery of the
cluding a peripheral wall having a discharge outlet, said
casing, which ?nish cannot be obtained by the usual
heavy walled casing including a rear wall spaced from
casting methods nor can the inner periphery of the
volute casing having a splitter integral therewith be ?n 55 said front wall, said rear wall de?ning an opening in
axial alignment with said suction inlet, impeller means
ished by other well known methods in the art.
disposed through the opening in said rear wall and being
Accordingly, it is an object of the present invention
mounted in said casing for moving ?uid from said suc
to obviate the foregoing di?’iculties in the manufacture
tion inlet through said discharge outlet, an independent
of heavy walled twin volute pumps.
It is another object of this invention to locate the 60 splitter element adapted for insertion as a unit through
the opening in the opening de?ned by the rear wall of
splitter accurately and connect it securely to the pump
said casing and said independent splitter element in
cluding spaced side walls detachably mounted in said
With these and other objects in view, as may appear
casing so that said spaced side walls are respectively
from the accompanying speci?cation, the invention con
sists of various features of construction and combination 65 contiguous with the front and rear walls of said heavy
walled casing, said independent splitter element dividing
of parts, which will be ?rst described in connection
the ?ow through said casing into two substantially equal
with the accompanying drawings.
FIGURE 1 is a longitudinal section showing a twin
volute pump construction embodying the principles of this
FIGURE 2 is a section taken on line 2—2 of FIG
URE 1.
portions prior to discharge, said independent splitter ele
ment of constant width and of lesser wall thickness than
70 said heavy walled casing, ?rst and second locater means
on the interior portions of the front and rear walls of
said casing, the side walls of said splitter element re
spectively disposed in abutment with both of theilocater
‘of’ the side wall of said independent'splitter contiguous
. means, and means for rigidly detachab'ly connecting the
V, to the front wall of said casing, tapped holes in the periph
ery of the side wall of said independent splitter con
tiguous to said rear wall, the openings in the side wall
disposed to coincide with the tapped holes in the Wall
of said casing and the tapped holes in the other side
. splitter to said locater means to'maintain the splitter
in operable position.
2;v In a centrifugal pump ofrthea-twin volute type; a
7‘ heavyjwalled casing of unitary cast construction having
alfront wall includinga suction inlet, said casingrinclude
wall ofthe splitter disposed to. coincide‘ with the holes
ing a, peripheral wall havinga discharge outlet, said
in. the rear wall of the ‘casing, and threaded members
casing including a rear wall spaced from said front wall,
, rigidly detachably'conne‘cting the side walls of said split
said' rear wall de?ning an opening inaxial alignment 10 ter ‘in abutment with the inner portion of the front and
_ with said suction inlet,rimpeller. means disposed through
rear walls of said casing at the tapped holes and open
the opening in, said rearwall and 'being mounted in said ' ingsto maintain the splitter in operative position.
casing for moving fluidv from said suction inlet to said
‘discharge outlet, an independent splitterieplement adapted '
References Citediin the ?le'of this’ patent,
. for insertion as a unit. through the openingin the open- 15 '
ing de?ned Iby'the rear wall of said casing and said inde
pendent splitter element including spaced side walls de
‘Harris ___<____ __,_____'__' Dec. 30, 1902
Neumann‘ ___.r_____"_____ Aug. 17, 1909
tachahly mounted in said casing so that said spaced side
walls are respectively contiguous with the front and rear,
walls of said heavy walled casing, said independent split-,
ter elementv dividing the ?ow ‘to said casing‘ into two
Skidmore _____‘_; _____ __'Sept. 13, 1921
Lawaczeck ___________ .__ Feb. 4, 1930
Putter ________ -4. ____ __ June .2, 1936
2,399,548 _ V Ingersoll -1. _____ __'___._ Apr. 30, 1946
2,661,698 '
Schellens _'___‘_ ________ __ Dec. 8, 1953
substantially equal portions prior to discharge, said inde
pendent splitter element of constant width and of lesser
wall thickness than said heavy walled, casing, a plurality
of tapped holes in the wall of the casing having said 25
suction inlet, a plurality of» openings in the rear Wall
of said casing, a plurality'of openings in the periphery‘ ,
Great ‘Britain ____;_'____ Oct. 14, 1921
Great Britain ________ .._ Oct. 25,
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