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Патент USA US3091193

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May 28, 1963
J. R. NAHRGANG
3,091,183
CENTRIFUGAL PUMP
Filed Feb. 23, 1960
_ 11% 14.
mm 1M
2928 21 21 43
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BY
ATTORNEY
3,091,183
Patented May 28, 1963
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1
is formed with an inwardly extending wall 23 having a
3,091,183
CENTRIFUGAL PUMP
James R. Nahrgang, Grand Island, N.Y.
(4445 Central Ave, Indianapolis 5, Ind.)
Filed Feb. 23, 1960, Ser. No. 10,303
6 Claims. (Cl. 103-113)
This invention relates to centrifugal pumps and more
particularly to improvements in the vertical axis type of
centrifugal pumps.
Prior centrifugal pumps tend to have a characteristic
known as air binding resulting in slippage between the
rotor and the material being pumped. When air binding
and the resultant slippage occurs the maximum pumping
efficiency of such pumps is appreciably reduced.
An object of the present invention is to provide an im
roved vertical axis type of centrifugal pump wherein
liquid material is pumped in a manner to overcome or at
least materially reduce air binding and the resultant slip
central opening 24.
The wall 23 thus divides the housing but its central
opening 24 provides communication between the inlet
chamber 20 and a frusto-conically shaped rotor chamber
25 formed by the walls 22 and 23. The wall 23 is prefer
ably inclined toward the rotor chamber and the area of its
central opening 24 approximates the area of the inlet
opening 21, whereby the ?ow of liquid material by gravity
through the inlet opening 21, the chamber 20 and the cen
tral opening 24 into the rotor chamber 25 is unrestricted.
The open larger end of the chamber 25 is formed with
an outwardly and downwardly extending curved annular
wall 26 having a circumscribing ?ange 27 so that the wall
25 together with a like shaped and ?anged annular wall
23 formed on the periphery of a closure plate 29 provides
an enlarged annular chamber 30 in open communication
with the rotor chamber 25.
The walls 25 and 28 are each formed with comple
20 mentary tangential or volute shaped portions 26’ and 28'
page which reduces the e?iciency of such pumps.
which together provide a tangential or volute shaped out
Another object is to provide an improved vertical axis
let 31 from the chamber 30. The abutting ?anged edges
type of centrifugal pump which will e?‘iciently pump
of the walls 26, 28, '26’ and 28' may be secured together
liquids containing more or less ?brous, abrasive or other
by any suitable means but are preferably secured together
materials or liquids substantially free of any such ‘ma
terials, for long periods of time without excessive wear 25 by bolts 32 so that the closure plate 29 may be readily
assembled and secured in place to complete the pump
of the pump parts.
housing and readily removed to provide access to the
Another object is to provide an improved vertical axis
chambers 30 and 25.
type of centrifugal pump with an improved rotor formed,
The spacer 13, the bearing 17, the seal 18, the inlet
arranged and rotatably mounted therein to pump liquids
and liquid materials in a manner which tends to release 30 chamber 20, the rotor chamber 25 and the chamber 30
entrained air or gas into a chamber of the pump from
' are concentric with the axis of the drive shaft of the
motor 11. A solid rotor shaft 35 rotatably mounted in
which it can be readily discharged when desired.
the bearing 17 has its upper end drivingly connected to
Another object is to provide an improved vertical axis
the motor drive shaft by a suitable coupling 36.
type of centrifugal pump having a small number of sim
The solid shaft 35 extends through and is engaged by
ply for-med component parts which require a minimum 35
the shaft seal 18 in the usual manner to prevent leakage
of machining and which, being easy to assemble, allows
of liquid from the inlet chamber 20. The lower end por
the pump to be manufactured and sold at a reasonable
price.
tion of shaft 35 is drivingly connected, as by a threaded
connection 37, directly to the center of a substantially ?at
These and other objects of the present invention will
appear from a perusal of the following detailed descrip 40 circular bottom wall 41 of a frusto-conically shaped rotor
shell 40. The lower end portion of the shaft 35 immedi
tion and the drawing. However it should be understood
ately above the driving connection 37 is enlarged and
that the description and drawing are intended to exempli
bell
shaped as at 38 for purposes to be hereinafter de—
fy the principles of the invention and that various modi?
scribed.
cations of the form and arrangement of the component
The rotor shell 40, preferably although not necessarily,
parts of the pump may be made within the scope of the 45
is of a unitary form in which the bottom wall 41 is
appended claims.
integated with and at the ‘lower end of a frusto-conically
In the drawing:
shaped annular side wall 42. The rotor shell 40 is rein
FIGURE 1 is a top plan view of an improved vertical
forced by an integral depending boss 43 at the center of
axis type of centrifugal pump constructed in accordance
50 the wall 41, and the wall 42 above its juncture with the
with the principles of the present invention.
bottom wall 41 is formed with a plurality of evenly
1FIGURE 2 is a vertical sectional view taken about on
spaced radially or otherwise disposed discharge apertures
the line 2—2 of FIGURE 1 and showing certain parts
44. The walls 41 and 42 at their juncture are formed
in elevation.
with a plurality of ‘spaced inwardly directed small sub
‘FIGURE 3 is a horizontal sectional view taken about
55 stantially triangularly shaped radially or otherwise dis
on the line 3—3 of FIGURE 2, and
posed reinforcing gussets 45, which are spaced from said
FIGURE 4 is an enlarged fragmentary vertical sec
apertures. 44 (FIGURE 3).
tional view showing a modi?ed form of pumping rotor.
The rotor shell 40, being rotatably supported by the
_
Referring now to the drawings wherein like reference
solid shaft 35 in concentric relation thereto, is formed
numerals denote like parts, a pump constructed in accord 60 and located so that the outer surface of its wall 42 is
ance with the principles of the present invention is gen
in evenly spaced relation to the inner surface of the
erally indicated by the numeral 10 and includes a suit
wall 22 and so that the smaller end of rotor shell 40
able motor 11 spaced from a pump housing 12 by an
terminates intermediate the top and bottom of the Wall
annular spacer 13 formed with hand holes 14 providing
22. The larger end of rotor shell 40 extends into the
access thereto. A plate 15, being formed with a central 65 chamber 30 and terminates in spaced relation to the
boss 16 which is axially bored to receive a bearing 17 and
closure plate 29, whereby the discharge apertures 44 lie
a shaft seal 18, is secured between the ?anged lower end
about midway between the walls 26 and 28 of the cham~
of the spacer 13 and the ?anged upper end of the annular
ber 30.
Referring to FIGURE 2 it will be seen that during oper
wall 19 of an inlet chamber 20 by any suitable fasten
ing means. The wall 19 is formed with an inlet opening 70 ation of the pump a central column of liquid or slurry
containing more or less entrained air or gases, in ?owing
21 and at its juncture with the smaller end of a frusto—
downwardly around the shaft 35, will ?ow over and be
conically shaped annular wall 22 of the pump housing 12
3,091,183
‘
3
smoothly directed ‘outwardly by the bell-shaped enlarge
ment 38‘ onto the contiguous surface of the wall 41 in
the manner indicated by arrows. Upon contacting the
rapidly rotating plate 41 the liquid or slurry will be ro
tated'thereby and forced outwardly across its surface by
centrifugal force at progressively increasing speeds and
force during its movement over diametrically larger por
tions of the Wall 41. The progressing increase of the
speed and centrifugal force of the liquid or slurry as it
moves across the wall 41 tends to release entrained air
or gases. The released air or gases may be allowed to
accumulate in the chamber 25'until the pressure therein
exceeds atmospheric pressure whereupon they may escape
4
liquid to ?ow toward the center of said substantially
smooth circular bottom wall and to enter liquid in said
rotor shell in the vicinity of the center thereof to thereby
cause liquid from said liquid inlet means to enter said
liquid in said rotor shell with a minimum of turbulence,
liquid oulets in said side wall proximate said substan
tially smooth bottom wall permitting passage of liquids
from said rotor shell, said liquid ?owing outwardly from
the center of said bottom wall toward said liquid outlets
and toward said converging wall across said substantially
smooth bottom wall with increasing linear velocity as a
result of the rotation of said rotor shell, the rate of liquid .
being supplied to said rotor shell through said liquid
through a suitable valve located in the wall 22 and indi
inlet means maintaining said rotor shell ?lled to a sul?
cated by the numeral 46 or they may be continuously or 15 cient depth so that the upper level of liquid in said rotor
intermittently removed from the chamber 20 by a conduit
shell is above said liquid outlets and the rate of’ rotation
47 indicated by broken lines in FIGURE 2 and con
of said annular rotor shell being of a magnitude to cause
nected to a suitable evacuating pump (not shown).
Due to the centrifugal‘ force imparted to the liquid
or slurry during its outward movement across the wall
7 41 a predetermined portion of the liquid or slurry is
the velocity of outward liquid ?ow in said rotor shell
to cause said entrained gases to be released ‘from said
liquid in said rotor shell while the contact between said
liquid with said upwardly converging side wall minimizes
forced through the apertures 44- into and through the
turbulence of said liquid to thereby prevent re-entrain5
chamber 30 and through its outlet 31 and another por
ment of gases into said liquid in said rotor shell, vand
tion of the liquid or slurry is forced up, held against and
vent means permitting said released gases to escape from
rotates with the wall 42, thereby forming an annular ro 25 said rotor shell.
_
tating mass of liquid or slurry shaped substantially as
2. A liquid transferring apparatus ‘as set forth in claim
shown in broken lines in FIGURE 2. The volume of
1 wherein a vertically disposed shaft is connected to the
the annular shaped rotating mass of liquid or slurry may
center of said substantially smooth bottom wall and
vary slightly during operation of the pump due to several
wherein said motor means drives both said shaft and said
causes. However its volume is always su?icient to cover 30 annular rotor shell because of the connection between
the reinforcing gussets 45, which also serve as liquid
said motor means, vertically disposed shaft and the bottom ‘
propelling vanes, andrwhich because they resist relative
wall of said rotor shell, and wherein a portion of said
movement between the rotating annular mass of liquid
shaft is located proximate said liquid inlet, whereby the
or slurry and the walls 41 and 42 prevent wear there
between and turbulence in said mass whichrnay cause re
liquid ?ow through said liquid inlet ?ows down said
entrainment of air or gases therein. It will be noted that
mizing turbulence between said liquid ?owing down said
shaft and the liquid in said rotor shell in the area at the
liquid or slurry ?owing into therrotor shell 40* wets the
entire exposed top surface of the wall 41 and an ad
jacent inner portion‘ of the wall 42, and that, notwith
standing the ?ow may be continuous, the wearing e?ect
of any wear producing material in the liquid or slurry
on the wetted surfaces of the rotor is very low.
shaft into the liquid on said bottom wall thereby mini-__
bottom of said shaft and said bottom wall.
3. A liquid transferring apparatus as set forth in claim 7
1 wherein said liquid outlets in said side wall are so
located that ‘the liquid ?ow through said outlets is de,
rived from the liquid located between the portions of said‘
liquid in contact with said bottom wall and said wall of
said rotor shell, thereby substantially preventing relative
In order to further increase the pumping efficiency of
the rotor in forcing liquid or slurry, around and through
the stationary chamber 30 and ‘from its outlet 31, the, 45 movement between the surfaces of said liquid in. con
outer peripheral surface portion of the larger end of
tact with said annular rotor shell to thereby prevent vwear
the Wall 42 is formed, as shown in FIGURES 2 and 3;
of said annular rotor shell resulting from the impi?ge
with a plurality of spaced radially extending or other
ment of abrasive particles thereon.
i ,
wise disposed small external vanes 48. The vanes 48,
4. A liquid transferring apparatus for conveying . a
being spaced togavoid interference with’ the discharge
liquid which includes entrained gases and for separating
ports 44 (FIGURE 3) and being shaped to extend into
said gases from said liquid comprising a housing, an an
nular rotor shell in said housing, said' annular rotor shell
extend above and below the discharge apertures 44 (FIG
having an upwardly converging wall and an open top and
URE 2), serve to rotate the liquid discharged into the
a substantially smooth circular bottom wall, motor means
chamber 30 at the same speed as that of the rotor, there 55 connected to and rotating said rotor shell, liquid inlet
by materially reducing the tendency of the stationary
means communicating with said rotor shell for permitting
walls of the chamber to slow down the forcible flow of
liquids to ?ow by gravity toward the centerof said sub‘
the chamber 30 in spaced relation to its Walls and to
liquid around, the chamber and through its outlet, where
stantially smooth circular bottom wall, liquid outlets
in said side wall proximate said‘ substantially smooth
As shown in FIGURE 4 a plate 49' is secured in sub 60 bottom wall permitting passage of liquids from said rotor
by the pumping pressure of the pump is maintained.
stantially ?ush relation to the depending boss 43 of the
rotor shell 40 and to the larger end of its wall 42, to
close the space therebetween, and thereby reduce any
tendency of the rotor to create turbulence in the liquid
being pumped.
I claim:
shell, said liquid ?owing outwardly from the center of
said bottom wall toward‘ said liquid outlets across said
substantially smooth bottom wall with increasing linear
velocity as a result of the rotation of said rotor shell, the
rate of liquid being supplied to‘ said rotor shell main- '
‘
e
1. A liquid transferring apparatus for conveying a
liquid which includesentrained gases and for separating
said gases from said liquid comprising a housing, an an
taining said rotor shell ?lled'to' a sufficient depth so
that the upper level of liquid in’ said rotor shell is above
said liquid outlets and the-rate of rotation of said annular
rotor shell being of a magnitude to cause the velocity
nular rotor shell in saidhousing constructed and ar 70 of outward liquid flow in said rotor shell to, cause said
ranged to receive a liquid having entrained gases, said
entrained gases to be released from- said liquid" in said
annular rotor shell having ‘an upwardly converging wall
rotor shell while the contact between the upper level of
and a substantially smooth circular bottom wall, motor
said liquid with said upwardly converging side wall mini
means connected to' and rotating said rotor shell, liquid
Vmizes turbulence of said liquid to thereby prevent re
inlet means communicating with said rotor shell directing 75 entrainment of gases into said liquid‘ in said rotor shell,
3,091,183
5
and vent means permitting said released gases to escape
from said rotor shell.
5. A liquid transferring apparatus as set forth in claim
4 wherein a vertically disposed shaft is connected to the
center of said substantially smooth bottom wall and
wherein said motor means drives both said shaft and
said annular rotor shell because of the connection be
tween said motor means, vertically disposed shaft and
the bottom wall of said rotor shell, and wherein a portion
of said shaft is located proximate said liquid inlet, where 10
by the liquid flow through said liquid inlet flows down
said shaft into the liquid on said bottom wall thereby
minimizing turbulence between said liquid ?owing down
6
?owing outwardly from the center of said bottom wall
toward said liquid outlets and toward said converging
wall across said substantially smooth bottom Wall with
increasing linear velocity as a result of the rotation of
said rotor shell, the rate of liquid being supplied to said
rotor shell through said liquid inlet means maintaining
said rotor shell ?lled to a su?icient depth so that the
upper level of liquid in said rotor shell is above said
liquid outlets and the rate of rotation of said annular
rotor shell ‘being of a magnitude to cause the velocity
of outward liquid flow in said rotor shell to cause said
entrained gases to be released from said liquid in said
rotor shell while the contact between said liquid with
said upwardly converging wall minimizes turbulence of
said shaft and the liquid in said rotor shell in the area
15 said liquid to thereby prevent reentrainment of gases into
at the bottom of said shaft and said bottom wall.
said liquid in said rotor shell, and vent means permitting
6. A liquid transferring apparatus for conveying a
said released gases to escape from said rotor shell.
liquid which includes entrained gases and for separating
said gases from said liquid comprising a housing, an
References Cited in the ?le of this patent
annular rotor shell in said housing constructed and ar
UNITED STATES PATENTS
ranged to receive a liquid having entrained gases, said 20
annular rotor shell having an upwardly converging wall
and a substantially smooth circular bottom wall, motor
means connected to and rotating said rotor shell, liquid
inlet means communicating with said rotor shell direct
ing liquid to flow toward the center of said substantially 25
smooth circular bottom wall and to enter liquid in said
rotor shell in the vicinity of the center thereof to there
by cause liquid from said liquid inlet means to enter
38,553
464,716
2,237,027
2,376,071
2,419,905
2,747,514
2,788,171
1863
1891
1941
1945
Miess _______________ __ Apr. 29, 1947
Edwards _____________ __ May 29, 1956
Kulow _______________ __ Apr. 9, 1957
16,500
19,030
515,749
Denmark ____________ __ Sept. 26, 1912
Great Britain __________ __ Sept. 6, 1898
Italy ________________ __ Feb. 16, 1955
FOREIGN PATENTS
said liquid in said ‘rotor shell with a minimum of tur
bulence, liquid outlets in said rotor shell proximate the 30
junction of said side wall and said bottom wall per
mitting passage of liquids from said rotor shell, said liquid
Brazelton ____________ __ May 19,
Robinson _____________ __ Dec. 8,
Dorer ________________ __ Apr. 1,
Miess _______________ __ May 15,
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