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Патент USA US2117573

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May 17, 1938.
P. c. RAwLs
ROTARY PUMP
Filed Jan. 8, 1936
'
2,117,573
. Patented May 17, 1938
2,117,573
UNETD STATES PATENT OFFICE
2,117,573
ROTARY PUlVIP
Paul C. Rawls, Des Moines, Iowa, assignor to
Webb-Glade Pump Association, Fontanelle,
Iowa, a partnership
Application January 8, 1936, Serial No. 58,074
2 Claims.
This invention relates to improvements in ro
tary pumps and the like, more particularly to the
type illustrated and described in the patent is»
sued to Frank Webb and Edwin R. Glade, on
5 July 10, 1934, No. 1,965,872.
In a device of the type employing a spherical
impeller element and a cup supporting the same
wherein the diameter of the impeller and cup
are of diameters equal to the width of the stator
space in which the rotor is mounted, the con
struction of the rotor member to» form a unitary
unit to withstand the operative strains is of vital
importance inasmuch as this type of rotor is
substantially divided into a number of segmental
15 sections with a comparatively small amount of
material connecting said sections. For this rea
son it is desirable that means be provided for
reenícrcing the rotor so as to form a rigid uni
tary unit. One of the objects of my invention
20 is to provide in a rotary pump of the type above
described improved rotor construction wherein
the segmental portions may be more rigidly
united together and so constructed that the cost
of manufacturing will be materially reduced.
A further object oi my invention is to provide
25
in connection with rotary pumps of the type
above described, improved bearing construc
tion for supporting the rotary element within
the stator and to locate the bearing in such posi~
30 tion as tc effectively take the lateral strain cre
ated by applying pressure to the fluid `passing
through the pump, as it will readily be seen that
this pressure is always in one direction and that
excessive wear between the rotor shaft and the
35 stator bearings will permit the rotor to move
to position against the contacting side of the
stator, which will result in excessive friction
and wear.
A further object is to provide in a rotary
40 pump of the type above described, improved
means for connecting and adjusting the oppo
sitely arranged impeller cups wherein threaded
sleeves connecting adjoining ends of the con
necting rods may be eliminated to >increase the
strength of the connecting rod and at the‘same
time decrease the size of the area required to
support the rods.
A further object is to provide in a rotary pump
of the type above described, improved construc
tion wherein the rotor shaft may be extended
through the rotor and through both of the bear
ing members of the stator, and wherein the rotor
element and the stator elements may be more
quickly and easily assembled and wherein the
(Cl. 103--138)
adjustment of the impeller cups may be more
easily accomplished.
My invention consists in the construction, ar
rangement and combination of the various parts
of the device, whereby the objects contemplated
are` attained, as hereinafter more fully set forth,
pointed out in my claims, and illustrated in the
accompanying drawing, in which:
Figure 1 is a vertical central sectional view of
my improved pump showing one-half of the 10
stator case removed and the rotor in section.
Figure 2 is a detail sectional view taken on the
line 2~--2 of Figure 1.
Figure 3 is a detail sectional View taken on
the line 3--3 of Figure l.
15
Figure 4 is a side elevation of my improved
rotor.
Figure 5 is a detail sectional View taken on the
line 5_-5 of Figure 4,
My improved pump comprises a stator casing 20
formed in longitudinal sections it and il, said
sections being secured together by means of
bolts l2 extending through suitable flanges i3,
the interior of the stator having its periphery
formed semi-circular in cross section, the side
walls of said stator chamber being parallel, each
of said walls being provided with an opening M,
said openings being mounted eccentrically of the
periphery of the casing. The inner end of each
of the openings I4 terminates in an annular re~ 30
cess I5.
Each of the side plates l0 and Il is provided
with a bearing plate IB for supporting the rotor
shaft l?, said plate l5 having outwardly ex
tending packing glands !8 designed to receive
packing material i9 and a bushing 20. The shaft
openings through the plate i6 and the bushing
2ï! should be large enough to permit Slight lat
eral movement of the shaft relative to said plate
and said bushing so that pressure and strain ap
plied to the shaft may be carried by anti-fric
tion bearings Zia supported Within the openings
if! in the manner hereinafter more clearly set
forth.
The rotor El is formed of two sections, 22 and
23, placed side by side and secured together by
means of bolts 24 so as to form a unitary unit.
The periphery of the unit thus formed is semi
circular in cross section to fit the semi-circular
periphery of the stator members It? and l i. The
side members of the rotor terminate in circular
flanges Z5, the central portion of said ñanges be
ing provided with hub portions 2t, said hub
members being mounted on the shaft il and
ñxed thereto by means of suitable keys 2l. The
2
10
2,117,573
ñanges 25 are designed to enter the recesses l5
of the stator' in the manner as clearly illustrated
in Figure 2. The hubs 26 extend through the
means for supporting the sections in a unitary
unit.
openings I4, said hubs being of smaller diam
diameter equal to the width of the stator cham
Due to the fact that the chambers 3| are of a
eter than said openings to provide space for re
ber it will readily be seen that said sections 43 will Cî
ceiving the anti-friction bearings 2|a, said anti
friction bearings providing means whereby the
be separated by the forming of said openings 28
rotor 2| and the shaft |'| are rotatably mounted
in the stator with the flanges 25 in the re
support the bearing members 2|a. and to thereby
provide a ñrm bearing support for the rotor.
The device is best assembled by first separating 10
cesses I5.
_
The body of the rotor 2| is preferably provided
with four radial openings 28 having their inner
ends connecting with the central opening or
chamber 29, preferably of a larger diameter than
15 the shaft openings 36 in the hub members 26, the
outer ends of the openings 28 being somewhat
larger to provide impeller cup supporting cham
bers 3|, the diameter of the chambers 3| being
equal to the distance> between the side members
The chambers 3| are pro
vided with impeller cups 32 and 33, each of said
cups having its outer end concaved to receive a
spherical impeller 35. The cups 32 are supported
in diametrically opposite chambers 3|, while the
25 cups 33 are supported in another set of diametrie
ally opposite chambers 3| in a plane at right
angles to that occupied by the cups 32. The
cups 32 are supported in fixed relation to each
other by means of tie rods 35, said rods having
30 their ends screw threaded in opposite directions
and into said cups. Lock nuts 36 are provided for
locking the rods against rotation after proper ad
justment of the cups 32 toward and from each
20 of the stator chamber.
other has been accomplished. Said rods 35 ex
._ tend through the openings 23 and straddling the
shaft l'l, as illustrated in Figure l, the sides of
said shaft l'l adjacent to said rods being provided
with notches 36 to form guides for the rods 35 to
permit the said rods to move longitudinally of
themselves and to prevent rotation of the cups 32
and 3|, while the hubs of the flanges 25 serve to
the stator sections and then placing one-half of
the rotor section in position in one-half of the
stator section with the shaft opening supported
vertically. The tie rods 3l and 39 may then be
assembled with their respective cups 32 and 33,
and with respect to the shaft |'|, one end of the
shaft |`| may then be placed in position in the
stator and rotor sections with the cups resting in
the semi-cylindrical chambers 3| of the assembled
rotor section. The cups 32 and 33 may then be
adjusted so that the impellers fit the inner pe
riphery of the stator. The other sections of the
rotor and stator may then be placed in position
and secured together. By this arrangement the
impellers may be easily and accurately adjusted.
One advantage of my device lies in the fact that
the tie rods 3l’ and 39 may be formed without the
_use of adjusting sleeves such as is disclosed in
Webb and other rotary pumps of this type, thus
providing more rigid connection between the op
posite cups, and at the saine time providing less
space for said rods. By mounting one set of the
tie rods to pass through the shaft |'|, and the
other set in the notches 36, I have provided means
whereby the cups 32 are held against rotation
within their operating chambers and at the same
time permit the cups to move freely longitudinally
of said tie rods and radially of the rotor. It will
further be seen that the rotor may be easily
machined due to the fact that the rotor may be
The cups 33 are connected
supported on an arbor of the same diameter as
by a similar set of tie rods 3l, having lock nuts 38,
the rods 31 passing through openings 33 formed
diametrically through the shaft |'|.
The rotor 2i is of smaller diameter than the
45
stator and mounted eccentrically thereof in the
manner illustrated in Figure l, the recess |5 being
the shaft Il, both halves of the said rotor being
bolted together so that the periphery of the rotor
and the side members of the flanges 25 may fit the
interior of the stator and the recesses I5.
in the chambers 3|.
Y concentric with the center of the rotor and with
50
the center of the shaft ll.
The periphery of the stator in actual construc
tion is not a perfect circle, and is so shaped that
the spherical impellers 34 of either set of impellers
will always engage the periphery of the impeller
during an entire revolution of any pair of said
55
impellers.
The stator casing is provided with an inlet
passage 40 and an outlet passage 4|, as clearly
illustrated in Figure 1. The inner ends of these
passages are provided with a pair of bridges "a2
60 for supporting the impellers as they move past
15
20
25
30
35
40
I claim as my invention:
1. In a rotary pump, a stator formed of longi
tudinal sections having a circular chamber, the
periphery of said chamber being semi-circular in
cross section, the side walls of said stator having
openings eccentrically of the axial center of said
chamber, the inner ends of said openings termi
nating in circular recesses; bearing plates cover
ing the ends of said openings; a rotor formed of
longitudinal sections; means for securing said
sections together to form a unitary unit, the pe
riphery of said rotor being formed with areas
semi-circular in cross section, the sides of said
rotor having circular ñanges of a diameter equal
to the distance between the centers of said semi 60
said passages, and to permit fluid to move into the
circular areas, said flanges being mounted to
stator chamber through the passage 46 and from rotate in said recesses, said rotor having axial
the stator chamber through the passage Gl. By openings and radial openings circular in cross
providing the bridges 42 the inlet and outlet section between its periphery and said axial open
ings, the diameter of the outer ends of said radial 65
65 passages may be easily formed large enough to
permit free movement of the fluid into and out of openings being equal to the diameter of said semi
the stator chamber without offering resistance to circular areas; a spherical impeller element slid
movement of the impellers as the rotor is rotated. ably mounted in the outer end of each radial
In the actual construction of the device the opening; and a shaft supporting said rotor.
f diameters of the ñanges 25 are equal to the dis
2. In a rotary pump, a stator having a circular 70
tance between the centers of the semi-circular chamber, the periphery of said chamber being
portions of the periphery of the rotor 2|. This semi-circular in cross section, the side walls of
flange 25 provides means for connecting the seg
said stator having openings, the inner ends of
mental sections 43 of the rotor body supported be
said openings terminating in circular recesses,
75 tween the radial openings '28 and thus provides
bearing plates covering the ends of said openings,
2,117,573
a rotor, the periphery of said rotor being formed
with areas semi-circular in cross section, the sides
of said rotor having circular flanges of a diameter
equal 'to the distance between the centers of said
serni~circular areas, said ñanges being mounted to
rotate in said recesses, said rotor having a series
of radial openings circular in cross section, the
3
diameter of the outer ends of said radial openings
being equal to the diameter of said semi-circular
areas, an impeller cup slidably mounted in the
outer end of each radial opening, a spherical im»
peller Within each cup, and a shaft operatively 5
supporting said rotor eccentrically in said stator.
PAUL C. RAWLS.
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