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Патент USA US3072073

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Jan. 8, 1963
‘
s. B. MCFARLINS
.
3,072s063
SELF-PRIMING PUMP
Filed April 22. 1960 i
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24
IN VENTOR.
23
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United States Patent Office
1
3,072,053
Patented Jan. 8, 1963
2
ing 1. This casing includes a front wall 22, a back wall
23 and a volute wall 24. The front wall 22 and volute
3,072,063
SELF-PRIMING PUMP
wall 24 de?ne a volute chamber 28 and a ?uid inlet
Stanley B. McFarlin, .leromesville, Ohio, assignor to The
opening 29. The back wall 23 and the front wall 22 de
Gorman-Rupp Company, Mans?eld, Ohio, a corpora
fine an impeller chamber 27 which, as may be seen by
tion of ()hio
referring to FIGURE 2, is the space within the diameter
Filed Apr. 22, 196i), Ser. No. 24,020
of the outer edges of the impeller blades.
6 Claims. (Cl. 163-113)
The back wall 23 of the pump has an axially extend
ing annular wall 30 which bears on back Wall 10 of
This invention relates to the pumping art and is par
ticularly concerned with a centrifugal pumping device 10 the housing and spaces the pump casing therefrom. The
back wall 23 of the casing is secured to the back wall
provided with means greatly minimizing, or substantially
10 of the housing by any suitable means, such for ex
preventing, wear due to abrasives between the front side
ample as the screws 31, one of which is shown in FIG
of the impeller and the opposed surface of the front wall
URE 1. The parts constituting the pump casing are so
of the pump casing.
proportioned with respect to the space between the back
In centrifugal pumps as constructed heretofore, par
ticularly those handling liquids containing abrasive sub—
wall 10 and the inner end of annular wall 7 that, when ‘
the pump is assembled in the housing, the front wall 22
of the casing will engage and press a gasket 35 against
between the front wall of the casing and the opposed side
the inner end of wall 7 while the annulus 30 engages
of the impeller. When the impeller blades extend be
yond the periphery of the impeller disc, such wear be 20 the back wall 10. Thus, walls 7 and 39 serve to space
the casing away from the front and rear walls of the
comes excessive. Either condition results in loss of
housing. In other words, annular wall 30 on the pump
pump efficiency because liquid propelled into the volute
casing and annular wall 7 on the front wall of the hous
by the impeller blades can reenter the inlet to the pump
ing serve to provide a space for ?uid entirely surround
ing chamber by way of the space between the front side
ing the pump casing. It will be understood that when
of the impeller blades and the opposed surfaces of the
the front and back walls of the housing are bolted to
front wall of the pump casing. To the extent that such
gether the separate parts constituting the pump casing
recirculation occurs, the efficiency of the pump is di
stances in small size particles, considerable Wear occurs
minished.
will thereby be clamped together and maintained in
assembled position.
When wear occurs between the rear side of
the impeller blades and the opposed rear wall of the cas
The volute of the pump casing terminates in a dis
ing, the liquid may not recirculate into the inlet to the
pumping chamber and hence, water flowing through the
space afforded by such wear does not impair the ef
charge end 36 which extends upwards from the point
of beginning of the volute wall 24 and gradually enlarges
?ciency of the pump to a serious extent.
in area as it progresses, and its terminus is in such rela
tion to the curved portion of edge wall 6 that any move
The present invention aims substantially to prevent
ment of ?uid from the discharge 36 is caused to ?ow
towards the ?uid outlet '9.
and the front wall of the pump housing, and this object
The shaft 12 is provided with a shaft seal consisting
is attained by the novel combination of elements em
of several parts, designated collectively at 40', which seal
bodied in the present invention.
may be ‘of any suitable or conventional type. Impeller
This invention will be better understood by those
skilled in the art from the following speci?cation accom 40 disc 45 is affixed to the inner end of shaft 12 with the cas
ing 21, and this disc is provided with a plurality of curved
panying the drawingarin which a preferred embodiment
impeller blades 46 which extend outwardly to points be
of the invention is disclosed.
>
yond the periphery of disc 45. The pumping device of
FIGURE 1 is a vertical, sectional view of a pumping
FIGURES 1 and 2 is mounted with the ‘longitudinal
device embodied in the present invention taken on line
45 axis of shaft 12 in a substantially horizontal position,
1-1 of FIGURE 2;
and with ?uid outlet 9 and the ?uid outlet 36 of the
FIGURE 2 is a vertical, sectional view of the device
volute lying above the shaft, substantially as shown
embodying the present invention taken on line 2—-2 of
the wear between the front side of the impeller blades
in FIGURE 2.
FIGURE 1;
' FIGURE 3 is a fragmentary, cross-sectional view taken
on line 3~—3 of FIGURE 2;
FIGURE 4 is an enlarged fragmentary view showing
the part of the joint between the front and back walls
of the pump casing; and,
FIGURE 5 is a fragmentary, sectional view taken on
line 5—5 of FIGURE 4 and showing the inter-engaging
relationship of the front and back walls of the pump
casing.
FIGURES l and 2 a housing 1 composed of a front
wall and back wall. The front wall 2 has laterally
projecting bottom edge wall ‘3, upright edge Walls 4 and
A screw plug 47 is provided for a‘
threaded hole in the top edge 6 of the housing for sup
50
plying initial priming liquid and for inspection purposes,
and a similar screw plug 48 is provided for a threaded
opening in the front wall 2 of the housing near its bottom
for drainage purposes.
The ?uid inlet opening 8 has its lowermost surface dis
posed above the longitudinal center line of the shaft 12.
This lowermost surface of inlet 8 serves as a drainage
level below which liquid will not drain out of the hous
ing when the rotation of the impeller ceases. In other
words, the surface level of the liquid in housing 1 and
casing 21 will not fall below the level indicated at 50 in
FIGURE 1 when the impeller is at rest.
The back wall 23 of the impeller casing is shaped to
provide, in cooperation with the volute wall 24, a pas
sage 51 which extends from the outer periphery of volute
5 and top edge wall 6 and a laterally extending wall '7
surrounding a ?uid inlet 8. Edge wall 4 is provided
with a ?uid outlet 9. Edge wall 6 is smoothly curved
opposite outlet 9 for a purpose presently to be described.
The housing also includes a back wall 10 which is bolted 65 wall 24 upwardly and inwardly into the impeller cham
ber 27 at an acute angle to the plane of the impeller
against the rear faces of the edge walls and is provided
with an opening 11 through which an impeller shaft 12
and tangentially to the periphery of the impeller and
extends. The back wall 10 is attached to a support 15,
against the direction of rotation of the impeller and the
as by cap screws 16, and this support 15 may be mounted
?ow of liquid in the volute.
70
on any suitable base 26.
As is shown in FIGURES 4 and 5, the back wall 23
A centrifugal pump casing designated as an entirety
of the pump casing is provided with a notch 64} into
by reference character 21 is positioned within the hous
which a lug 61 on the volute wall 24 extends for the
3,072,063
3
4
.
purpose of positioning these two walls relative to one
another and against relative rotation. As FIGS. 1, 4 and
5 show the casing walls have two sets of mutually engag
parting from the scope of the invention as set forth in
what is claimed.
What is claimed is:
1. A self-priming centrifugal pumping device compris~
ing annular surfaces by which casing wall 22 is positioned
radially and axially by the casing wall 23. One set of 5 mg:
these surfaces consists of the cylindrical concentric sur
faces on wall 23 and on part 24 of wall 22. The other
set consists of the axially abutting surfaces including
notch 60 and lug 61.
The above described apparatus operates substantially 10
as follows:
Let it be assumed that it is desired to pump liquid in
through inlet 8 and out through outlet 9‘, and that the
surface of liquid in housing 1 and casing 21 is at the
level indicated at 50 with gas ?lling the space within the 15
casing above the liquid level. The pump shaft 12 is
rotated ata velocity great enough for the impeller blades
46 to cause the liquid in the pump casing to move out
(a) a housing including a front wall, a back wall and
means for clamping the two walls together at their
peripheries, said housing de?ning therewithin a cham
ber for a centrifugal pump,
(b) a centrifugal pump in said chamber, said pump
including a casing having a front side wall, a rear
side wall and a volute wall between the peripheries
of said walls,
,
(c) said casing de?ning animpeller chamber and a
volute chamber surrounding the impeller chamber,
(d) the front wall of the housing and the front side
wall of said casing having inlets for the flow of a
liquid into said impeller chamber,
wardly into the volute chamber 28 and to ?ow therein out
(e) an impeller in said chamber,
through outlet 36 and into the interior of the housing.
Some of the gas in the casing will be mixed with the
(f) a shaft extending through the rear wall of the
housing and the rear side wall of the casing and
liquid being moved into and through the volute chamber
and will be carried into the space above the volute out:
let 36 where the gas will separate from the liquid and
may escape through outlet 9 with the liquid returning 25
to the bottom part of the housing 1. During this stage
of operations and as soon as the liquid level in the eas
ing falls below the level in the housing, liquid will flow
into the impeller chamber through passage 51. In this
manner, the liquid recirculates from the housing through 30
the pump casing and back into the housing; and this
attached to said impeller,
_
‘
(g) said rear side wall of the casing only having a
passage extending upwardly and inwardly there
through at an acute included angle to the plane of
rotation of the impeller from adjacent to the bottom
of said housing chamber and opening directly into
the impeller chamber above the lower edge of the
impeller and below the surface of liquid in said
chamber when the impeller is at rest, and means
spacing the front and back walls of the pump casing
action continues so long as there is any gas in the casing.
from the front and back walls of the housing, re
Since the rotation of the impeller removes gas from
spectively, said spacing means serving when the front
and rear walls of the housing are clamped together
within the casing, a vacuum condition is created in the
casing which causes gas in the inlet 8 and a pipe con 35
nected thereto to ?ow into the casing. Such a pipe will
?ll with liquid as the gas is thus Withdrawn from it. The
casing 21 and the housing 1 will eventually become com
at their peripheries, to press the front and rear walls
of the pump casing against one another in assembled
operative position and to maintain them in such posi
tion during use.
2. The combination of elements set forth in claim 1
pletely ?lled with liquid, and liquid will thereafter be
pumped in through the inlet 8 and out through outlet 9. 40 in which the means for spacing the pump from the front
This completes the priming of the pump.
and back walls of the housing includes an annular wall
When the pump has thus been primed, the direction
between the front wall of the housing and the front side
of ?ow of liquid in passage 51 will be reversed, where
wall of the casing about said inlet, and an annular wall
upon part of the liquid propelled by the impeller will
between the rear wall of the housing and the rear side
?ow out of the casing through the volute outlet 36 and
wall of the casing around said shaft.
part will flow through passage 51. However, ?uid ?ow
3. A self-priming centrifugal pumping device compris
ing from both of these outlets will ?ow out of housing 1
mg:
through outlet 9.
,
(a) a housing including a front wall, a back wall and
It will be understood that during the priming stage,
means for clamping the two walls together at their
the ingress of liquid through passage 51 into the back
peripheries, said housing de?ning therewithin a
portion of the impeller chamber greatly reduces the usual
chamber for liquid,
amount of wear, due to abrasives, between the front edges
(b) a centrifugal pump casing within said chamber
of impeller blades 4-6 and wall 22. This reduction in
and ‘spaced from the walls of the housing and includ
wear is due to the fact that such liquid will carry its solids
ing two walls de?ning therebetween an impeller cham
into contact with the rear edges of the blades. Thus any
wear between the impeller and easing, during priming,
will be substantially restricted to the rear side of the im
peller and the opposed surface of the rear Wall. Since
liquid which escapes from the volute into the space be
tween the rear edges of the blades and the opposed sur
face of the rear wall of the casing cannot return within 60
the casing to the inlet to the impeller chamber, the ef
?ciency of the pump will be maintained regardless of
the extent of wear between the impeller and the opposed
surface of the back wall of the pump casing.
Having thus described this invention in such full, clear, 65
concise and exact terms as to enable any person skilled
in the art to which it pertains to make and use the same,
her and a volute,
(c) an impeller in said casing and a shaft attached to
the impeller and extending through one of said casing
walls and through the adjacent wall of the housing,
(d) the ?rst of the casing walls being ?xed to one of
the housing walls and being positioned thereby rela
tive to the shaft and impeller,
(e) two sets of mutually engaging annular surfaces on
said casing walls for positioning the second casing
wall radially and axially relative to said ?rst wall
and to said impeller,
.
(f) and means for holding said casing walls in an as
sembled position including an annulus provided on
one of said housing walls and engaging and press
and having set forth the best mode contemplated of
ing said second casing wall against said ?rst wall un
carrying out this invention, I state that the subject mat
der compressive forces exerted by the adjacent hous
70
ter which I regard as being my invention is particularly
ing wall when the housing walls are clamped to
pointed out and distinctly claimed in what is claimed, it
gether.
'
being understood that equivalents or modi?cations of, or
4. The combination of elements set forth in claim 3
substitutions for, parts of the above speci?cally described
in which the said annulus is integral with the adjacent
embodiment of the invention may be made without de 75 housing wall.
3,072,063
5
6
5. The combination of elements set forth in claim 3
in which the ?rst casing Wall has an integral annular wall
extending around said shaft and attached to the adjacent
housing Wall and the said annulus extends around the
inlet into said casing and is integral with the adjacent
housing wall.
6. The combination of elements set forth in claim 3
in which the said annular surfaces are concentric cylin
drical engaging surfaces on the casing Walls to position
References (Cited in the ?le of this patent
UNITED STATES PATENTS
1,946,212
1,981,025
2,041,586
2,224,615
2,244,397
2,627,817
2,755,743
the second casing Wall coaxially with the impeller and
abutting surfaces disposed at an angle to the shaft to posi
tion the second casing Wall longitudinally relative to
the ?rst casing wall.
'
Jacobsen ______________ __ Feb. 6, 1934
Bird ________________ __ Nov. 20, 1934
Bargen _______________ __ May 19,
Stratton ______________ __ Dec. 10,
La Bour ______________ __ June 3,
Mann _________________ __ Feb. 10,
1936
1940
1941
1953
Rupp ________________ __ July 24, 1956
FOREIGN PATENTS
691,362
994,892
1,127,938
Great Britain _________ __ May 13, 1953
France _______________ ._ Nov. 23, 1951
France _______________ __ Dec. 27, 1956
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