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Патент USA US2113116

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.April 5, 1938‘.
' 1 Filed April 9,
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A1335, 1938- -
> r J. O.iMcMll‘_LAN
Filed April 9, 1935
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0. McMillan
‘Patented Apr. 5, 1938
“ ~ 2,113,116’ '
- James 0. McMillan, ‘Wichita, Kans;
Application April 9, ‘1935, Serial No. 15,486
1 Claim. ‘(01. 103-96)
makes it possible to cast or‘ die cast the impeller
This invention relates to pumps and more
particularly to regenerative pumps and is a con
struction capable of pumping a, mixture of water
of bronze or other similar material.
Additionally, I aim to provide an impeller pref-
erably having two raceways .with means for ad-- '
and air at the same time to as high a ‘pressure
5 head with one impeller as‘. will the commonly
justmentwhile the pump is in operation to_ com- 5
known multiple stage centrifugal pump. It is
of thetype having a casing provided with an in
let opening and outlet opening for receiving and
discharging either liquid or liquid and air by
pensate for wear, to provide means for adiust- ,
ment to- take up wear in the raceways independ
in the action of a rotor of the single cone or dou
ently of the impeller, to provide such a pump
with interchangeable and renewable raceway lin
ers in which the ?uid raceways are sealed one 10
ble cone type with a multiplicity of enclosed from the other, and to provide a pump of this
type in which one of the passageways‘ may be used
vanes leaning in the direction of rotation, im
pinging against the free liquid in‘ the channels ' for low pressure and the other for high pressure
of the pump and carrying the ?uid therein with to make a two stage pump for high pressure duty.
Various additional objects and advantages will ill
become apparent from a consideration of the de
scription following taken in connection with ac
companying drawings illustrating an operative
combined action thereof resulting in a helical or ,
15 it.
Operation of the pump is aided by kinetic en
ergy, centrifugal force and tangential force, the
spiral course or travel of, the ?uid to cause a
parted to the particles of fluid as it travels through
‘ In said drawings:
regenerative action or repeated impulses im
Figure 1 is a_ substantially central, longitudi
nally sectionalview through one form of pump
One object of this invention is to improve this ' according to my invention;
.type of pump as to structure, efficiency and vol
25 ume based on the discovery that if the raceways
are properly curved and placed at right angles
to the axis and at an angle to the rotor, the
helical path taken by the ?uid and the pressure
head will be increased. ,,
A second object of my invention is to provide
:1 double cone or triangular rotor having two
channels sealed one from the other to increase
the volume, to balance the rotor load, a d to
prevent the impeller from becoming air bound
:3 by providing sucha rotor that one side may
pump liquid and the other side may pump air.
A third object is to provide in a, pump of the
general character stated, a chamber in which the ‘
liquid and air arelseparated and in which the
4-9 liquid, or a portion of it, is revolved in the di
rection opposite to rotation of the rotor and the
travelling ?uid in the channels, and to return ‘a
Figure 2 is a vertical, substantially central cross
sectional view through said pump;
Figure 3 is a fragmentary side elevation of the
Figure 4 is a cross sectional view taken on the .
line 4—4 of Figure 3;
Figure 5 is a. detail view of the combination 30
check valve and strainer employed, being partly
in side elevation and partly in section;
Figure 6 is a view similar to Figure 3 but the‘
vanes thereof being disposed at the opposite an
Figure 7 is a section taken on the line 'l-‘| of
Figure 8 is a central, longitudinalsectional view
through a modi?ed form of pump;
Figure 9 is a section taken on the line 8~—9 40
of Figure 8, and
Figure 10 is a sectional view taken on the line
Ill-10 of Figure 9.
Referring specifically to the‘ drawings where
maintain a seal.
in like reference characters designate like or 45
Another object of the invention is to_provide ~ corresponding parts throughout the di?erent
an impeller in which the channels and vanes are
views, and ?rst to the form of Figs. 1‘ to 7, l
designates the pump casing having a removable
positioned at zones remote to the axis and have
portion of the water into the rotor chamber to
means for adjustment and increasing the ca- .
cover 2 bolted at 2’ to one side thereof, which
casing encloses an impeller 3 between liners l and 50
A further object is to provide an impeller in ' 5. Said liners 4 and 5 have annular, inwardly
m pacity.
which the vanes lean in the direction of rotation
and are otherwise angular to cause the fluid to
extending portions 6 and 'I enclosing the impeller
and provided with raceways 6' and ‘I’ communi-_
travel in a more pronounced spiral path .to in
eating with a common inlet 8, and a common
radial outlet 9. Said raceways are blocked or 55
55 crease the ' pressure head.
This construction
sealed off betweenthe inlet and outlet by a solid . studs 3| by means of a screw driver’ engaged'with
portion iii of said portions 6 and ‘I. _
key-ways or kerfs 3|’ thereof. Adjustment of
Said impeller or rotor 3 is mounted on a tapered the.impeller is effected by relative adjustment
portion ll of a ‘shaft l2 and'held rigidly in place of the nuts 22 and 23.
by a nut l3 screwed to the shaft._ In turn, shaft
It will be apparent that arrangement of the
I2 is mounted on double row ball bearing devices impeller channels on an angle to a perpendicular
l4 and l5_ and sealed by rotary shaft seals l6 ‘ line, usually but not necessarily a 45° angle, and
and I1 against seats [8 and I3 through the agency raceways to match this angle causes the ?uid to be
of expansive springs 20 and 2| surrounding the acted upon. by centrifugal and tangential forces,
.10 shaft. Adjusting nuts 22 and 23 maintain the the centrifugal force causing the ?uid to follow
impeller 3 in proper spacedrelation'with respect the curved channels“ and raceways to return the 10
to the liners 4 and 5 to prevent a'ctu'al‘metal to ' ?uid to the blades at the point nearest the axis
metal contact and its undue wear. A spring to receive additional impulses, the inclination of
washer 24 between bearing device l4 and nut any matter moving in a circlebeing to ?y radially
15 22 permits of shaft expansions and contractions. from the center of rotation to the extreme point
The mounting parts for said shaft are disposed of the periphery. The ?uid-is encased and trapped 15
within tubular extensions la and 2* of the casing - in:the channels of the rotor 3 and the raceways
and cover and lubricant is. supplied to the shaft 6' and l’ and the resultant forces cause the ?uid
and other working parts, preferably to maintain to be deflected at right angles and downwardly to
a bath, by introduction through openings nor
be returned to the impeller blades 21 where the 20
mally covered by screw plugs Ib and 2b.
blades give it added impetus and a succession of
Speci?cally, the impeller rotor 3 is of the double such impetuses assists in the two forces mentioned
' cone, triangular or wedge shape at the periphery
as ‘shown and intimately contacts with walls of
the portions 6 and ‘l inwardly of the raceways.
The impeller vanes are on opposite sides of rotor
3, extending generally parallel to shaft I2 and
designated 21. Said vanes‘2l slant in the direc
tion of rotation to the extent of 45° and the faces
30 thereof are also 45° to a line perpendicular to
the shaft I2.
The ‘base walls of the raceways
6 and ‘I are preferably semi-circular and the
spaces between adjacent blades or vanes 21 have
in creating a growing pressure head as the liquid
again and again receives kinetic energy from the
impeller 3. ‘This ef?cient action of the impeller 25
is due to a large extent to the tapered impeller
with its tapered channels, blades inclined in the
direction- of rotation, raceways on an angle to
match the channels of the tapered impeller to
cause the ?uid to be acted upon by centrifugal 30
‘force at the point most remote from the axis of
rotation and because the centrifugal force is
greatest at this point,v the ?uid is de?ected at
right angles and downwardly towards the axis
at a point where centrifugal force is not so great 35
their base walls substantially semi-circular but
preferably ?attened slightly at 21'. These vanes,
raceways and spaces are designed substantially , returning the ?uid to the blades to receive a series
as described so as to cause the ?uid to describe ’ of impulses as outlined.
a path of travel approaching a helical or spiral
path in the impeller'channels or spaces and the
40 raceways, the object being to cause the ?uid ahead
to dip or return back into the impeller vanes
The helical or spiral
path taken by the-?uid results in the fluid re
turning to the impeller blades at a point farther
ahead in, the direction of rotation, when it would 40
again receive, kinetic energy by the action of
and receive a plurality of impulses to increase ‘the impelling vanes.
The e?lciency of the pump is materially in
The impeller has grooves 25 engaged by seal
creased by the balanced wedge type of the im
the pressure head.
45 ing rings or packing 26 of the liners ‘4 and 5 to
prevent radial‘ leakage or inward seepage of fluid.
Said blades 21 preferably have their backs more
pronouncedly tapered than theirv fronts to pre
vent the formation of eddies and the curved base
50 walls of the spaces or channels between the vanes
21 also prevent the formation of eddies.
In pumping a mixture of air and water, it-is
preferable to connect an air inlet to only one
side or one raceway near the-inlet so that the
55 impeller may at all times be water sealed vand
prevented also from becoming air bound.
As a
further precaution, an air separating chamber
29 is provided in the outlet 3. This chamber 29
has its wall round with its axis parallel ‘to the
60 axis of shaft l2 and hence it causes the water
Various changes may be resorted to within the
spirit and scope of the invention, for instance to
dispose the blades or vanes 21 and the channels‘
at angles greater or less than that set forth.
I may also dispose .the blades or vanes of the 50
impeller as designated 21' in Figs. 6 and '7 at the
opposite angles to those described so that the
pump will operate in the reverse direction to
that described, the other pump parts correspond
ing to such reversal.
- As shown in Figs. 2 and 5, I may employ a novel
combined check valve and strainer combination
at the intake or suction‘ end of the pump to keep
the water from falling back into the well or source
of supply and to protect the impeller and parts 60'
from coarse sand and other particles. This
device has a casing 32 having an inlet at 33 in
to form a whirlpool in which a portion of
the water will be ‘returned to the vanes 21 to
perfect ‘and maintain a water seal while pump ' line with a removable, tubular screen 34, held in '
ing a mixture of water-and air. The water in - place by a screw plug 35 in one end of casing 32.
65 said chamber 29 revolves in the opposite direc
A pipe 36 connects casing 32 to inlet 3 of the
tion t9 the impeller and thus releases the air at pump, such pipe communicating with a chamber
the outlet and a portion of the water is returned 31 within the casing which communicates with
to the impeller 3 to ,displace the air which may inlet 33 and the screen chamber through a valve Q
have remained between the blades 21.
To compensate for corrosion, erosion and wear,
seat 38. Said vvalve'seat is normally covered by'
a check valve 39, removably secured to a stem
the raceways 4 and 5 are interchangeable and . by nuts 40 and washers 4|, the upper end of the‘
‘renewable. They are also adjustable for wear
independently of the impeller and while the pump
is in operation. This adjustment is accomplished
stem being slidably telescoped in 9. depending
tube 42 of a removable screw closure or plug 43
for an opening ‘of casing'32 through which the,
75 byremoving screw plugs 30 and adjusting screw . valve and valve seat are applicable and remote-f
able. ’ Strainer or screen 34 is removable for
blades increase the efficiency and pressure of th
Instead of the vanes 21, raceways and channels
being provided on two sides of an impeller, they
may be provided on one side only, as in the form
of Figs. 8, 9, and 10. Speci?cally, there are .two
raceways and two sets of blades, the outlet of
one raceway being connected to the inlet of the
.next one to form a two-stage pump. In this
10 form, a casing 44 is used having an inlet 45 and
outlet 46.
The combined check valve and
strainer of Figs. 2 and 5 may be connected to
inlet 45 if-desired. On one side of casing 44 is
a side plate 46 removably bolted in place at 41.
15 Within the casing, an ‘impeller 48 is disposed
being mounted on a shaft 49 in the same man
ner in which impeller 3 is mounted on shaft l2,
and said shaft 49 in casing 44 and side plate
46 being mounted in the identical manner in
20 which the aforesaid‘ shaft 12 is mounted. Cas-_
ing 44 has an interior ?uid raceway 50 which is
semicircular in cross section and extends more
than 360° around the casing, thus being spiral
or substantially so. (Jo-acting with such race
25 way 50 are vanes 5| and channels or spaces 52,
identical in structure and arrangement to the
vanes 21 and channels or spaces between them,
being however, arranged in a path more than
360° so as to correspond with the raceway 50.
30 Raceway 5!! discharges at 5! into the outlet 46.
By reason of the construction last described,
the impeller 48 is impelled by the ?uid almost
I claim as my invention: I
A pump of the class described having a casing
open at one side provided with an annular wall,
a side wall and an outlet chamber extending
from the side wall to the open side and ,out
wardly from the annular wall, said chamber
having its inner wall curved about an axis sub-'
stantially parallel to the longitudinal axis of 10
the casing, a shaft journalled longitudinally in
said casing, a peripherally wedge-‘shaped im
peller on said shaft, liners disposed one on each
side of said impeller, each inclined face of said _
impeller having channels, blades in said chan
nels inclined in the direction of rotation and ,
disposed at an angle to the axis of the impeller,
said liners having portions jointly surrounding
the periphery of the impeller and provided with
raceways ‘opposite the respective channels and
communicating through said portions with said .
outlet chamber, and a closure at said open side
of the casing abutting one of ‘said liners and se
cured to the casing, said side wall' and closure
having tubular outward extensions disposed 25
about said shaft provided with interior shoul
ders, seat members for said shaft located in said.
extensions and abutting said shoulders, seal de
vices about the shaft engaging said impeller and
said seat member's, expansive springs about the
shaft engaging said impeller and said seal de
two revolutions before being discharged so as
vices, said impeller having a tapered fit on said
shaft with the taper ?aring in a direction away
to increase the pressure head.
from said closure, and screw elements on said -
If desired, the blades or vanes 21, 21', and SI,
instead of being integral with the parts carry
ing them, may be initially separate and welded
in place. These separate blades or vanes may
be made of ‘very thin sheet metal. Such thin .
closure operable from the exterior of the pump
and against one of the liners to move the same
and adjacent parts to take up wear.
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