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Nov. 13, 1962
P. J. STANLEY ETAL
3,063,377
CENTRIFUGAL JET PUMP
Filed D80- 51, 1958
2 Sheets-Sheet 1
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?féé
Nov. 13, 1962
P. J. STANLEY ETAL
3,063,377
CENTRIFUGAL JET PUMP
Filed D60. 51, 1958
2 Sheets-Sheet 2
112
1 38
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40
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61
Unite States Patent () "'
Patented Nov. 13., 1962
2
1
ings located generally in a horizontal plane passing
through the axis of the impeller. One of the discharge
3,063,377
CENTRIFUGAL JET PUMP
I Peter J. Stanley, Evanston, and Lee S. Tiller-y, Morton
Grove, Ill., assignors to Clayton Mark & Company,
Evanston, Ill., a corporation of Delaware
"
Filed Dec. 31, 1958, Ser. No. 784,316
2 Claims. (Cl. 103-113)
openings faces downwardly and the other upwardly. ‘ The
volute is provided with a coaxial opening de?ned by an
axial extension and the impeller has a coaxial inlet dis
posed within the volute opening. Means are provided to
minimize or prevent the passage of water between the im
pellcr inlet and the volute opening. The second end Wall
'of the housing has an inwardly extending generally cylin
The present invention relates to centrifugal jet pumps
and has for its primary object the provision of a new and 10 drical portion coaxial with the volute opening and of sub
stantially the same size. This inwardly extending portion
improved centrifugal jet pump of a type convertible for
is connected in sealed manner with the volute axial exten
use for wells of different depths such as shallow, inter
sion; A venturi tube is mounted within the ?rst of the
mediate depth and deep wells. More particularly‘, it has
"two wall openings and it is arranged to discharge into the
for its object the provision of a new and improved self¢
15 impeller inlet. A nozzle is provided to discharge into the
priming centrifugal jet pump.
v
The pump of the present invention is primarily intended
venturi tube and the nozzle is connected to the second
opening in the other end wall of the housing, whereby the
nozzle is supplied with water under pressure discharged
shallow wells up to about 25 feet and for wells of inter
by the centrifugal pump. The self-priming of the present
mediate depths up to 40 feet and for deep wellsrup to
about 80 feet or somewhat more. A single .jet assembly 20 invention is provided by a conduit called a priming tube
and located within the pump discharge housing. It has
is used for both the shallow and intermediatejdepth wells.
one end connected to discharge into the region between
For the shallow wells the jet assembly is attached to the .
‘the venturi tube and the impeller inlet, this being at the
pump itself. For the intermediate depth wells the jet as
to be used in a water supply system.
It may be used for
v‘uppermost part of the inlet substantially at a location .
sembly is detached from the pump and placed in the well.
For the deep wells a different jet assembly‘ is utilized in 25 ,which may be conveniently described as the “12 o’clock”
region. _The other end of the tube, i.e. the inlet end
the well.
.
.
-
.
_
In the pumps of the foregoing type, dit?culties have.
thereof, is located near the bottom of the discharge hous
been encountered in priming, especially when the pump is
ing at the region approximately half-Way between the ver
tical center line of the impeller axis and the vertical plane
used as a shallow well pump and operated at open dis
charge. This type of operation is encountered as when 30 of the said one volute opening, where there is substan
tially no'air entrained in the water. The housing is of a
the pump is used to supply water as to a cattle drinking
size that it has a larger capacity than that of the impeller
trough or in most installations in testing prior. to connec
and-its associated. volute. Its- capacity is such that after
tion of the pump to a supply tank. In starting operation,
the pump is given an initial charge of water which consists 35 the housing is initially charged with water preparatory to
operation and the pump is started, there is an initial start
in ?lling the pump housing'and downpipe, provided the
‘ing surge in which some of the water is discharged after
check valve is placed at the bottom of the well where it is
which the impeller remains substantially covered with
preferably placed. However, in many cases, this’ initial
water." The construction and operation is thus such that
charge is not su?icient tomake the pump thereafter a
self-priming pump. In many installations the pump has 40 after the initial charging and starting of the pump there
remains enough water in the pump that it is recirculated
to be ?lled each ‘time that the pump is placed in operation
through the jet. At the same time, water is supplied by
and this is particularly true withpumps operated on open
the priming tube from a quiescent region of water at the
discharge. The object of the present invention is to pro
bottom of the discharge housing to the impeller inlet or
vide in simple manner a self-priming pump, i.e. a pump
which will operate without requiring subsequent manual 45 eye. The pump has a discharge outlet at the upper side
of the discharge housing and an inlet connected to a point
priming after the pump has initially been ?lled or charged
with priming liquid.
Accordingly, it is an object of the present invention to
between the nozzle and the venturi.
The inlet is con
nected, for shallow well operation, to the well downpipe.
The construction and arrangement are such that self
provide a self-priming centrifugal jet pump which can be '
made economically with a minimum of material and in 50 priming of the pump occurs. The impeller forces water
to the discharge chamber. Some of this water is supplied
which the priming is supplied by a simple device consist
to jet and some to the priming tube. As a result, air and
ing of a tube communicating with the inlet of the centrifu
Water are removed from the downpipe. The air escapes
gal pump and supplying water to that inlet from near the
from the discharge opening and the water is recirculated
bottom of the pump discharge housing.
In brief, the centrifugal jet ?uid pump of the present 55 until the pump operates as a fully primed centrifugal jet
pump. The pump becomes fully operative in a relatively
invention includes a discharge housing comprising gen
short period of time such as between two to ?ve minutes
erally pear-shaped parallel end walls and a side Wall con
depending upon other circumstances. The pump is not
necting the end walls. One of the end walls is provided
only self-priming when connected to a conventional water
with a circular opening at the bulbous region of the hous
supply system including a pressure tank but when the
ing. The other of the end walls is provided with a pair of
pump operates on open discharge. Also after having
smaller opening of which a ?rst is coaxial with the circu
been placed in operation as described above, it reprimes
lar opening and a second is located below the ?rst and
itself should this become necessary for any reason such as
near the lower end of the housing. Centrifugal pumping
a leak in the downpipe or major changes in water level in
means is disposed in the housing. This pumping
means includes a motor driven impeller rotated about a 65 the well.
substantially horizontal axis and an impeller surrounding
volute mounted at the circular opening of the said one end
wall. The volute has a pair of peripheral discharge opcn- ,
Otherobjects and advantages of the present invention
will become apparent from the ensuing description of an
illustrative embodiment of the invention, in the course of
" 3,063,377
3
'
which reference is had to the accompanying drawings,
in which:
FIGURE 1 is an end elevational view of the pump of
the invention;
FIGURE 2 is an enlarged vertical axial cross-sectional
View taken along the angular line 2—2 of FIGURE 3
4
and is located substantially within the bulbous part 24
of the pump housing.
The volute 36 is held in place by the pump housing
20, the latter being provided with a generally tubular
inwardly extending portion 76 coaxial with the volute
extension 62 and engaging the latter with considerable
force through a sealing gasket 78, see FIGURE 2. The
motor for driving the pump;
housing 20 in turn is secured to the motor end bell as by
the plurality of bolts 80 and both it and the volute en~
FIGURE 3 is a fragmentary vertical diametrical cross
sectional view of the pump taken along the line 3—3 of 10 gage a sealing gasket 81. The volute is located relative
to the pump housing by a locating tongue 82 on the
FIGURE 2; and,
volute and a slot 84 receiving the tongue in the end wall
FIGURE 4 is a view similar to FIGURE 3 taken
along the line 4-4 of FIGURE 2.
30 of the housing, see FIGURES 2 and 3.
Referring now to the drawings, and ?rst primarily to
The venturi 38 and nozzle 40 are mounted in what is
commonly termed a jet body 90 detachably secured as
FIGURES 1 and 2, the pump of the present invention
is illustrated as a whole by the reference character 10.
by the bolts 91 to the front wall 28 of the pump housing.
As clearly illustrated in FIGURE 2, it is shown to be of
The latter is provided with a ?rst opening 92 located
and illustrating fragmentarily and partly in section the
the centrifugal jet type, and it is adapted to be driven
coaxially relative to the impeller inlet. The opening 92
by a motor shown but fragmentarily and indicated by
includes an outer threaded portion 94 and an unthreaded
the reference character 12. The motor is of known type 20 inner portion 96 adjacent the axial extension 76. The
including a housing 14 having an end bell 15 and a driven
end wall 28 also includes a second internally threaded
shaft 16 generally rotated at a speed of about 3450 to
opening 98 below the ?rst opening 94 and which opening
communicates with the lower part of the pump discharge
3600 r.p.m. and sealed by a rotary seal (not shown).
, chamber 22.
The size of the motor varies depending on the capacity
of the pump. For example, it may be of =1, 1%, V2 or Vs
The venturi 38 is secured as by a threaded connection
horsepower.
The pump 10 of the invention includes a discharge
housing indicated as a Whole by the reference character
20 within which is a discharge chamber 22. Upon ref
erence to FIGURE 1, it may be seen that the housing
is of a shape that can be described aptly as substantially
“pear-shaped.” It includes a rather bulbous lower por
tion 24 and a generally triangular or trapezoidal upper
portion 26. The housing may be made in various ways
but as illustrated it is made as a single casting with a
100 to the jet body 90 so as to be generally coaxial rela
tive to the impeller inlet 56 and so that it discharges into
the impeller inlet. The jet 40 is mounted upon an in
ternal partition 102—104 de?ning a passageway 106
having an opening 106A connecting the nozzle with pas
sageway ‘98. The inlet of the venturi is connected by
a passageway 108 to a threaded opening 109 forming
the inlet of the pump and connected in shallow well
service to a drop pipe 110 extending down into the well.
In accordance with conventional practice, the impeller
pair of generally pear-shaped parallel end walls 28 and
inlet is adapted to be connected to suitable air charging
30, the former of which for convenience will be de
apparatus, not shown, through a passageway 112 com
scribed as the front wall and the latter as the rear wall.
municating with the inlet of the pump through an annular
These two walls are interconnected by a continuous side
passageway 114 provided by the space between the dis
40 charge end of the venturi tube and the opening 96 in the
wall 32.
In addition to the housing 20‘, the main parts of the
iznswardly projecting extension 76 of the pump front wall
pump are a motor driven impeller 34 and a surrounding
volute 36, a venturi 38, a nozzle 40 discharging into the
The pump is made self-priming in accordance with the
venturi and the priming means 42 of the present invention
present invention by priming means 42 comprising the
which is shown as a tube 44, which can be made of brass, L15 tube 44. Referring now to FIGURES 2 and 3, it will be
copper or plastic, or it may be made as an integral part
noted that the inlet end 120 of the tube is disposed near
of the volute.
the bottom of the discharge chamber 22 and at a region
The impeller 34 is of known constitution. It includes
a central hub 46 attached to the end of the motor shaft
16. It includes also an imperforate rear plate 48 and -
an imperforate front plate 50‘, between which are located
a plurality, such as six, outwardly divergent radial dis
charge passageways 52. At the axial region the discharge
passageways 52 communicate with an impeller inlet 56
or eye, as it is sometimes called, de?ned by a cylindrical '
axially extending portion 54 of the impeller.
between a vertical plane passing through the axis of the
impeller and a vertical plane passing through the volute
discharge passageway 70. It has been found that the lo
cation of the tube is somewhat critical and the indicated
location is preferable because the water in the discharge
chamber is most air free at this region. The inlet end
of the tube 44 is ?xedly located as by passing it through
an apertured lug 122 formed integrally with the volute
36.
The volute 36 surrounds the impeller and together with
The discharge end of the priming tube is indicated by
a portion of the motor end bell 15 provides an impeller
chamber 58 enclosed at its front by the cover portion 60
of the volute which has an axial forwardly extending ex
the reference character 124 and its location is such that it
is approximately at what might be called the 12 o’clock
region of the impeller inlet. This end of the tube is held
in non projecting manner in opening 126 in the axial
extension 62 of the volute, the tube thus being made to
tension 62 surrounding the impeller inlet 56.
Leakage
of water between the impeller inlet and volute may be
minimized by close dimensioned clearance or prevented
as by a gasket 64 disposed between ?anges 54 and 62.
The volute is provided with a pair of peripherally ex
tending tapered discharge passageways 70 and 72, see
FIGURE 3, of which the former faces downwardly and the
latter upwardly. The discharge openings are arranged
discharge into the space 128 between the impeller inlet
and discharge end of the venturi. Best results have been
obtained by locating the discharge end of the priming tube
rather close to the 12 o’clock region of the impeller inlet.
However, some latitude is permissible in its location. For
example, it may be located in a region described as 11 to
to be in a generally horizontal plane and the impeller ro
1 o’clock although some advantage can be obtained if lo
tates in a direction corresponding with the direction of 70 cated in a wider region from 10 to 2 o’clock. However,
enlargement of the discharge passageways and as indi
best results are obtained, as already indicated, when the
cated by the arrow 74 in FIGURE 3.
discharge end is quite close to the 12 o’clock region. Just
The volute is relatively small in size in comparison
why this should be the case is not de?nitely known at the
with the pump housing and discharge chamber. It ex
present time although it may be that the introduction of
tends only a short distance axially of the chamber 22 75 substantially air free water at this region insures ?lling
‘3,063,377
of the impeller eye with water, thereby making ‘the pump
operate effectively to remove air from the pump and‘
downpipe.
'
r
,
Generally, a pump of the character-described is sup
lied with a separate check valve (not shown) at its inlet
‘end. This check valve may be located close to the jet
body 90, but preferably it is located below the water
level in the well, at which location it is commonly termed
afoot valve.
»
~
, .
-.
v,
>
'
What is claimed as new anddesired to be secured by
United States Letters Patent is as follows:
'
'
1. A centrifugal jet ?uid pump including in combina
tion, a discharge housing having a bulbous region and
formed vof generally pear-shaped, parallel end walls and a
side wall connecting the end walls, one of said end walls
having a circular opening at the bulbous region of the
housing,‘ the other ‘of said end walls having smaller ?rst
and second openings‘ of which the ?rst is coaxial with the
v The discharge from‘ the ‘ressure chamber is located 10, circular opening and the second is located below the ?rst
and near the lower end of the'housing, centrifugal pump
at the top of, the chamber at which point there is a
ing means includinga'rotatable vimpeller and a surround
threaded outlet opening 130 to which a discharge pipe
ing volute mounted in the circular opening of said one
132 is connected. In open discharge, the pipe 132 dis
end wall, said volute having a pair of peripheral divergent
charges to atmosphere. In most installation, however,
the pipe 132 leads to a pressure tank, notshown, and 15 discharge openings located. generally in a horizontal
plane passing through the axis of the impeller, said im
constituting part of a system in which the water is main
peller rotating in the direction of divergence of said open
tained at a pressure between 20 to 40 pounds. When
ings, one of said openings facing downwardly and the
ever the pressure drops below the desired minimum,
other upwardly, said volute having a coaxial inlet de?ned
the motor is placed into operation as by a pressure switch
means indicated by reference character 134 in FIGURE 20 by an axial extension and the impeller having a‘ coaxial
inlet disposed within said volute inlet, a seal between
1 and which has a connection 136 leading to the dis
said inlet and volute opening, said second end wall
charge chamber 22.
having an inwardly extending generally cylindrical por
‘As heretofore indicated, the greatest di?iculty in pro
tion coaxial with the volute opening and of substan
per priming of prior pumps is encountered in shallow
well operation with open discharge operations, i.e. when 25 tially the same size, sealing means connected between said
portion and the volute axial extension, a venturi tube
the discharge of the pump is connected to atmosphere
mounted in the ?rst wall opening and discharging into
and pipe 110 is used as a suction pipe extending below
the impeller inlet, a nozzle mounted to discharge into the
the water level in the well. The di?iculty in priming
venturi tube and in ?uid communication with the second
results from the fact that when pump is placed into
opening in said other end wall, and a priming tube Within
operation there is an initial surge of discharge which
said discharge chamber having one end connected to dis
charge between the venturi tube and impeller inlet at the
uppermost region thereof and having its other end near
does not occur.
_
the bottom of the discharge housing at a region approxi
To place the pump in operation the discharge chamber
22 is ?lled or charged with water. Generally this means 35 mately halfway between the vertical center line of the im
peller axis and the vertical plane of the said one volute
that not only is the discharge chamber 22 ?lled with
opening wherein the ?uid is substantially free of air and
Water, but the impeller and volute are ?lled and so are
said housing being larger than the capacity of the impeller
the jet body and the inlet pipe 110 down to the check
and volute and so that after the housing is ?lled with
or foot valve, whichever may be the case. Then when
water
the impeller remains covered with water after the
40
the pump is placed in operation there is an initial surge
initial starting discharge surge.
of water from the discharge, however, the present ap
2. A centrifugal jet ?uid pump including in combina
paratus is so constructed and arranged, as mentioned,
tion, a discharge housing having a bulbous-region and
that this discharge does not empty the chamber but rather
formed of generally pear-shaped, parallel end walls and
the impeller and volute remain substantially covered
with water. Approximately seventy percent of the ini 45 a side wall ‘connecting the end walls, one of said end walls
having a circular opening at the bulbous region of the
tial ?lling of water remains in the pump. At the same
housing, the other of vsaid end walls having smaller ?rst
time, water from the quiescent bottom region of the dis
and second openings of which the ?rst is coaxial with
charge chamber is supplied to the impeller inlet thereby
the circular opening and the second is located below the
to maintain the impeller in effective operation as a result
of recirculation of the priming liquid. The pump thus 50 ?rst and near the lower end of the housing, centrifugal
pumping means including a rotatable impeller and a sur
operates effectively to draw water and air from the down
rounding volute mounted in the circular opening of said
pipe until all the air escapes through the discharge open
one end wall, said volute having a pair of peripheral diver
ing and the pump becomes fully primed.
gent discharge openings located generally in a horizontal
Thus far the description of the pump has been with
plane passing through the axis of the impeller, said im
the pump adapted for shallow well operation. To con 55 peller
rotating in the direction of divergence of said
vert it to an intermediate depth well, the jet body 90 is
openings, one of said openings facing downwardly
removed and connectedto a pair of pipes and placed
and the other upwardly, said volute having a coaxial inlet
in the well below the normal water level. When this
de?ned by an axial extension and the impeller having a
is done, the opening 106A in the jet body is connected
inlet disposed within said volute inlet, said sec
by a ?rst pipe to the opening 98 and an opening 140 in 60 coaxial
ond
end
wall having an inwardly extending generally
the jet body is connected by a second pipe to the opening
cylindrical portion coaxial with the volute opening and of
92. In this type of operation, priming is carried on in
substantially the same size, a venturi tube mounted in
empties the pump to a considerable extent so that the
pump loses its prime. In the present construction, this
the same way as heretofore described with water ‘from
the ?rst wall opening and discharging into the impeller
the quiescent bottom region of the discharge chamber 22
inlet, a nozzle mounted to discharge into the venturi tube
being supplied to the impeller inlet through the priming 65 and
in?uid communication with the second opening in
tube 44.
To convert the pump to a ‘deep well pump, the con
nections are as in the intermediate depth described above,
except a different jet and nozzle are used. Priming is
said other end wall, and a priming tube within said dis
charge chamber having one end connected to discharge
between the venturi tube and impeller inlet at the upper
most
region thereof and having its other end near the
carried on the same as heretofore.
70
bottom of the discharge housing at a region approxi
While the present invention has been described in con~
mately halfway between the vertical center line of the
nection with details of a particular embodiment thereof,
impeller axis and the vertical plane of the said one volute
it should be understood that these details are not intended
opening wherein the ?uid is substantially free of air, and
to be limitative of the invention except insofar as set
forth in the accompanying claims.
75 said housing being larger than the capacity of the impeller
3,063,377
7
8
and volute and so that after vthe housing is ?lled with
'water the impeller remains covered with water after the
initial starting discharge surge.
.
References Cited in the tile of this patent
UNITED STATES PATENTS
Ferguson _____ __'_.~_'.'_.____ July 1, 1941
2,247,654
2,287,397
2,306,841
2,343,486
2,375,571
'
Rupp ______ __'...‘__'_v___ June 23, 1942
Adams, ___________ _;__ Dec.‘ 29, 1942 10
Stepanoff ____________ __ Mar. 7, 1944
Mann _______________ _>_.. May 8, 1945
2,475,118
2,524,269
2,524,770
Patterson ______________ __ Oct. 3, 1950
Conery ______________ .._ Oct. 10, 1950
_, 2,615,397
, Conery __ ____________ .._ Oct. 28, 1952
‘2,664,823
Steenrod ____; _________ __ Jan. 5, 1954
-, Carpenter ______ _'_ ____ "Sept. 23, 1958
2,853,014
.,2,911,916
Wolfe et al _____________ __ July 5, 1949
Bliss ________________ __ Nov. 10,.19
‘FOREIGN PATENTS
555,256
797,484
1,130,511
.
'
Great Britain _________ __ Aug. 12, 1943
France ______________ _.. Apr. 27, 1936
France _______________ _- ‘Feb. 6, 1957
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