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Патент USA US2134219

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Oct. 25, 1938.
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E. w. TILTON
,
2,134,219
ROTARY PUMP
Filed Dec. 18, 1936
w] 0%’
2 Sheets-Sheet 1
‘ Om“!
E. w. TILTON
‘
2,134,219
ROTARY PUMP
Filed Dec. 1a, 1936
i6?
\
2 Sheets-Sheet 2
140% 9 @o-hqr
Patented o¢t._25,*193s v
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2,134,219
UNITED STATES PATENT‘
ROTARY PUMP
Edward W. Tilton, Oshkosh, Wis., assignor of
one-half to Harryv R. Kay," Winnetka, Ill.
-
Application December 18, 1936, Serial No. 116,457
'
5.
2 Claims.
(01. 103-144)
My invention relates to rotary pumps and par-
portions of these passageways being de?ned by
ticularly to rotary pumps of the impeller or vane
type, such as are used for pumping oil, water,
suitable hollow bosses or projections 9 and H
cast integrally with the housing. The outer. ends
milk, pulp, and other liquids.
of these projections may be conveniently thread
Stated generally, the principal object of the
ed"for connection to pipes or the like, as at l2. 5..
present inventionisto provide an improved rotary .- To give increased rigidity to the housing, cen--- .
pump of the impeller or vane type which shall
trally disposed external ribs l3 are cast integral- ~
be more ei?cient in operation, less expensive to
ly therewith, the ribs, I3 extending between the
- construct and manufacture, and easier to repair,
10 clean, and service than any of the pumps here-
feet 3 and the inlet and outlet passageway de
?ning projections 9 and H. “
l0
The bore l5 of the housing I is accurately
machined to a cylindrical form, and the two ends
of the housing I6 and I1 are machined flat in
tofore known to the art. Somewhat more spe-_
ci?cally, it ‘is an object of. the present invention
to provide an improved rotor structure for use
in pumps of the subject type; to provide an im-
planes substantially perpendicular to the axis of
15 proved impeller assemblage for use in pumps of _ the bore l5. Spaced holes I9 are provided in the 15
the subject type; and to provide an improved
seal and bearing structure for use in pumps of
the subject type.
side walls of the housing | for. receiving tie bolts
20 which serve to hold the stationary parts of
'
These and other objects of the invention, and
20 ‘the preferred method of accomplishing the same
will bem'ade more apparent by reference to'the
following description taken in conjunction with
the attached drawings, wherein-
_
the pump in the assembled position.
" '
The housing | is closed at either end thereof
by: an end plate 2|, preferably of cast metal. 20
Each of the end plates 2|, as is particularly illus
trated in Figures 2 and 3, includes an inwardly
'
Figure 1. is a sectional view through a, rotary
25 pump embodying the features'of the present in-
projecting, hollow boss 23, the outer surface 25
ofvwhich is accurately machined to a cylindrical
form. Each of the bosses 23 is provided with an ‘25
inner bore 26 eccentrically disposed with respect
vent'ion;
~
Figure 2 is a sectional view on the line 2—2 of I to the outer surface 25 thereof, and with a cylin
Figure 1;
_
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.
Figure 3 is an exploded perspective; view show30 ing the rotor, the impeller assemblages, and certain other of the structural features of the pump
drical opening 21 .for receiving the shaft 29 form
ing‘a part of the pump rotor.
'
A_ somewhat similar hollow boss 3| projects 30
outwardly from the outer surface of eachof the
illustrated in Figures land 2;
.
,
end plates 2|, the bosses 3| having a cylindrical
, Figure 4 is a perspective view of one of the ‘ bore 33 for receiving the bearing and the gland
~impeller assemblages;
I
seal, which will be described indetail later.‘ The
35
Figure 5 is an elevational view, ‘partially in outer edge of each of the end‘ plates 2| is re- '35
section, of one of the impeller assemblages;
cessed to form a-?ange 34 for engaging the, end _ ‘
Figure 6 is a sectional view showing the features of one of the‘ roller members which serve
to connect'the impeller blades to the rotor proper;
40
I
.Figure 7 is an end elevational View of this-
roller support, the view being taken on the gen-
surfaces l6 and I‘! of the housing I, and suitable
holes 35 are providedin the ?ange.“ for receiving .
the tie bolts 20 which extend through the holes
in the housing.
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I
_
40
It will be seen that when the end vplates 2|
eral line '|-'| of Figure 6;
' _
>
are ‘fastened-in positionupon the housing |, the
Figure 8 is a. sectional view on the line 8—8 of _ space enclosed thereby will be substantially cylin
Figure 6; and
45
‘y
' '
a
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Figure 9 is a fragmentary, perspective view
of one of the combined bearing and seal struc-4
tures ‘forming a part of the pump‘ illustrated I
particularly in Figures 1 and >2.
" ,
The-pump illustrated in the drawings includes
drical in form.- The pump rotor-is‘ adapted to
move within this space and includes a generally 45
cylindrical body -_memb81‘- 3'' press-?tted and _
keyed to the rotor shaft 29 which extendsthrough
theialigned openings 21 in the end plates 2|. At
either end thereof the‘ rotor body 31 is- under
50; a generally cylindrical housing | preferably of‘ cut by an "annular recess 39 for receiving the 50
cast metal. Suitable. feet 3 for attaching ‘the - bearing portions of the impeller assemblages 4|
pump to the supporting structure therefor are which‘ are mounted upon theinwardly projecting ,
discharge
cast integrally
passageways
with this
5 and
housing.
7|, respectively,
' ‘Intake and
are
55 provided in the walls of the housing I, the outer
,
,
I
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_
The
bosses
rotor
23 forming
body is provided
a_part ofalong
the end
the plates
periphery
2|.
thereoi with a plurality of longitudinally extend; 65
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_,|
_
_
.
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2,184,219
ing, regularly spaced, cylindrical slots 43 for re- ' lindrical slots 43 in the rotor, and the engaging
surfaces of the slots and the rollers are machined
slots 43 are open along the periphery of the to a bearing fit. The impeller blade 49 forming
pump rotor 31 and connect with the annular a part of each of the impeller members is adapt
recesses 39 at either end thereof. _In the pump ed to be disposed within a longitudinal rectan
-illustrated in the drawings, the rotor body 31 is gular slot 55 formed in each of the blade sup
provided with four of the slots 43. It will be porting rollers 5!. To secure the best mechani
understood that any number of such slots as is cal advantage, it is desirable that this slot 55
indicated by the design of the pump may be used. shall have a depth greater than one-half the
10
The end surfaces 45 of the rotor body 3'! are diameter of the roller, and to minimize the width 10
of the pump, one end of each of the rollers 5|
machined flat in planes substantially perpen
dicular to the axis of rotation of the rotor, and is provided‘with a transversely extending slot 58
which aligns with the annular recess 39 in the
the longitudinal width of the rotor is made slight
ly less- than the width of the space enclosed rotor body 31! to receive the right angle portion
15 between the end plates, i. e., su?cient clearance of the impeller extending between the blade and
being provided to accomplish a good running ht the hub portion thereof.
This arrangement permits the width of the en
between the end plates 2i and the ends of the
rotor body. For pumps of moderate capacity, a tire rotor, including the cooperating impeller as
semblages, to be kept the same as the width of
clearance of two-thousandths of an inch will gen
20 erally be found satisfactory for this purpose. If the impeller blades, thereby simplifying the prob 20
desired, shims may be used intermediate the end lem of securing a good seal within the pump, and
also materially aiding in reducing the space oc
surfaces it and ii of the housing and the ad
,
jacent surfaces of the end plate flanges 3% for cupied by the pump.
I prefer to utilize roller hearings in conjunc
permitting adjustment of the width of the en
25 closed space during the operative life of the tion with the pump of my invention, but it is 25
to be understood that other types of bearings
. pump.
The impeller assemblages Ail forming a part of may be successfully employed. It is, of course,
the pump of my invention are illustrated par- ‘ desirable that the bearings shall accurately po
ticularly in Figures 3, 4, and 5, and as will be sition the rotor within the housing and shall be
30 seen from inspection of those ?gures, each of of a low friction type. The bearing and seal as 30
these assemblages includes a pair of impeller semblage illustrated particularly in Figures 2 and
members ill and ‘it which are normally assems 9 is intended for use with a roller bearing. As
bled in cooperative unitary relationship. For will be seen by reference to those ?gures, the
bore
formed in. each of the end plates 2i is
convenience, I have designated one of these im
35 peller members (the member ?ll) as the male partially closed at its inner end by an annular 35
‘member and the other (the member 68) as the member bl which defines a suitable retaining sur
female member. Both types of members are face for a gasket, and a gasket 58 of the conven
tional trapezoidal cross section type is placed
provided with an impeller blade as generally rec
against the outer surface’ of this member during
tangular in cross section.
Each of the impeller members also includes an the assembling of the pump so as to surround 40
annularly shaped hub or bearing portion. ‘The ‘the rotor shaft 29.
.
'
An annular gasket retaining ring 5% of suit
hub portion of each of the male members fl‘? is
provided with a cylindrical bore 52 adapted to able dimensions is next introduced into each of
be journaled upon the outer surface 25 of one the bores» 33. This ring is followed by a roller
bearing assemblage 60 of the conventional type, 45
45 of the inwardly projecting bosses 23 forming a
part of each of the end plates 29. The outer the‘ outer race of which is adapted to abut
surface of the bearing portion of each of the against the gasket retaining ring. Preferably, the
.male impeller members 41 is provided with an. gasket retaining ring is recessed, as at 6!, to
annular recess 53 which is adapted to engage a positively ‘prevent any interference with the
movable race of the bearing. The next element 50
suitable ?ange forming a part of the hub por
50
tion of the cooperating female member 48 with in the bearing and seal assemblage is a combined
a bearing fit. By virtue of this arrangement, the bearing and lubrication retainer 62. This mem
two impeller members may be assembled into the ber, as is shown particularly in Figure 9, is gen
erally cylindrical in its outer dimensions and is
unitary relatiozfship, shown particularly in Fig
provided with an annular recess 63 machined in
55 ures 4 and 5, and each of these units can then
be journaled upon ’one of the inwardly projecting the inner surface thereof for providing a lubrica-.
bosses 23 forming a part of each of the end plates tion well. Lubricant is admitted into this recess
2 I, as illustrated in Figure 2. It will be seen that through a suitable opening 54 formed in the up
this arrangement permits the maximum possible per portion thereof, and the proper positioning
of the retainer member 62 is assured during the 60
60 bearing surface for each of the impeller assem
blages, which necessarily rotate at the same assembling operation by means of a pin 65 which
speed as the pump rotor, and yet at the same is ‘adapted to engage a suitable slot formed in
time it permits relative movement about the axis the wall of the adjacent outwardly projecting
ceiving the impellers and their supports. These
of rotation of the unit as a whole between the
boss II.
65 male and female impeller members making up ‘
each of the impeller assemblages. This construc
tional arrangement of the impeller units is one
of the. important features of the present inven
tion.’
'10
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'
After the gasket 58, the gasket retaining ring 65
59,_the bearing 60, and the bearing and lubricant
retainer 82, have been placed in position within
each of the bores 33, a suitable retaining nut
61 is screwed in position so as to hold the several
_The impeller blades 49 are driven by .the rotor, ‘elements in place and to tighten the gland seal. 70'
and for mechanically interconnecting the rotor ' It will be seen that the number of structural fea
tures utilized in making‘ up each of the bearing
with the impeller blades, I utilize slotted, cy
lindrical rollers 5|, the features of which are and seal assemblages is reduced to the barest min
illustrated in Figures 6, 7, and 8. One of the imum, and that substantially all of the elements
rollers Si is positioned within each of the cy
- are called upon to perform more than one func
75
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2,134,219
tion, the outer race portion of the bearingBIJ, within 45° of the horizontal, as indicated at 13.
for example, serving to transmit the stress in
The width of the slots, 12, as is shown in Figure 2,
duced by the retaining nut 61 to the gasket re ' is purposely made substantially less than the .
taining ring 59, and the bearing retainer 62
width of the impeller blades 49' in order to ac
also serving as a lubricant retainer. The entire
complish the most ef?cient and quiet’operation
of the pump. Through the arrangement of these‘
assemblage is a simple and highly ef?cientar
rangement, and not only serves to give a good
seal between the shaft and the interior of the
pump, but in addition constitutes a seal which is
10 particularly free from any possibility of contam
ination, this feature being of great importance
when the pump is used for handling milk or like
liquids. Further, this arrangement permits the
pump'to be easily disassembled, as for cleaning.
15
During operation of the pump, power is ap
plied to the rotor shaft 29 from any suitable
source.
Due to the‘ eccentricity of the axes of
rotation of the impeller assemblages and. the
rotor, ‘the impeller blades 49 project from the
20 surface of the rotor at all times except when they
are passing across the seal point 69 at the upper
portion of the pump housing. The amount of
this projection varies from zero or less at this
upper or seal point to a maximum at the bottom
25 of the pump casing. The bore l5 of the housing
I is concentric with the axis of rotation of the
impeller assemblages 4|, and hence a very close
?t may be maintained between the impeller
blades 49 and the inner surface of the bore at all
30 times during operation of the pump. This makes
for high heads and high pumping e?iciency. At
the same time, the retractable feature of the
blades assures a‘ complete cutting 01f of the inlet
and outlet sides of the pump at the seal point 69.
35
It is apparent that there is substantial rela
tive movement between the impeller blades 49
and the supporting rollers 51 therefor during op
eration of the pump. Because of this, it. is de
slots 12, the actual pumping or working portion
of the pump is con?ned to the space enclosed by
two ‘of the impeller blades. Actual tests have
shown that this assures much more satisfactory 10
and more reliable operation than has ever been
accomplished in any of the prior art devices. It
also permits the pump to be used for pumping
liquids which contain rather large amounts of
solid material, such as grit, metallic oxides or
scale, machinings, and the like. The pump is
completely reversible, as will be apparent from
inspection of the drawings.
From the foregoing, it will be seen that I have
disclosed the features. of an improved form of 20
impeller pump which operates much more‘ ef
ficiently and much more satisfactorily than any
of the pumps heretofore developed. This im-‘
proved operation is brought about, to ya consider
able extent, by virtue. of the novel arrangement 25
of the impeller assemblages, which assures a
large bearing surface for each of the impeller as
semblages as a whole while at the same time pre—
venting any undue increase in the dimensions of
the pump.
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30
.
The pump of my invention is an exceedingly
compact structure, and there is substantially no
waste space whatsoever withinthe pump hous
ing. This means that no liquid is retained with
in the pump for any material, interval of time, 35
which is of great advantage from a sanitary view
point when pumping perishable liquids such as
milk, and of great advantage from the viewpoint
sirable that the spaces beneath the impeller blades ‘ of preventing clogging when pumping liquids con- ‘
taining solid material.‘ The novel structural ar
bility of excessive friction due to unequal pressure rangement-of my pump permits ready disas
distribution. In the pump illustrated in' the‘ sembling thereof, thus particularly adapting it
' drawings, this interconnection is accomplished for use in pumping milk or other food products
by four passageways 1| (Figure 1). The outer and for the pumping of pulp solutions which
have a notorious tendency to clog pumps of all
45 portion of each of the passageways ‘H is pref
erably formed by a suitable drilling in one of the types. The improved pump of my invention se
roller members 5|, and the inner portion of each cures a much more positive and more accurate
of the passageways ‘H constitutes a connecting control over the movement of the impeller blades
drilling which extends through the rotor body 3‘! than was heretofore believed possible of attain
and the shaft 29. The drillings through the ment, and this control is accomplished with a 60
shaft preferably intersect and connect with each minimum of frictional effort. I/have disclosed a
other so as to attain the best possible equalization novel arrangement for the ports. of the pump
of pressure during the operation of the pump. of the subject- type, which arrangement con
_It will be also apparent that there is a certain tributes materially to the improved operation of.
55 amount of relative angular movement between the . the pump of my invention, and I have also dis 65
impeller blades 49 and the rotor body 31 during the ' closed an improved form of bearing and seal as
operation of the pump. It is for this reason that semblage which is particularly adapted for use
the roller membersjl engage the slots 43 within in conjunction with the pump‘ of my invention.
the rotor body with a bearing ?t, and that the Moreover, the pump of my invention is com
,
.
60 impeller blades ‘49 engage the slots 55 within the pletely reversible.
40 shall be connected in order to minimize any possi
rollers with a bearing ?t.
I It will be understood that various modi?ca
In connection with the operation of the pump , tions and variations may be made in the form
of my invention, I have found that the position
ing and form of the inlet andcutletports 5 and ‘I
05 is of considerable importance.
Particularly, I
of apparatus embodying the principles of the
present invention, and it is my intention that
the claims shall be accorded» the broadést rea
have discovered that if the ports are extended ‘ sonable construction consistent with the state ofv
along the bore of the housing I so that the
actual working surface of the bore of the pump
subtends an angle no greater than the angle be- ‘
the .art.
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I claim the following as my invention:
‘
1. A rotary pump comprising a shaft, 8. body
member supported on said shaft and having at
each end thereof an annular recess ‘arranged.
70 tween two adjacent impeller blades, substantial
improvement of performance will result. This is
accomplished in the pump illustrated in the concentrically to the axis of the shaft, the outer
drawings by the provision of a rectangularly portion of said member. being provided with a
' shaped slot 12 formed in the side walls of the plurality of cylindrical slots, said slots being open
75 housing, which slot is extended down to a point along the peripheral surface of said member, a
05
4
2,184,219
cylindrical roller member disposed in each slot,
each roller being provided with a longitudinal
slot, a casing for said body member, a plate for
closing each end of the casing, each plate be
ing provided with an inwardly projecting boss
positioned coaxially with respect to the axis of
the casing, each boss having a circular opening
therein positioned eccentric with respect to the
axis of the'casing, an impeller assemblage com
10 prising a pair of impeller members respectively
supported upon each boss for rotation about said
axis, each pair comprising a male impeller mem
ber and a female impeller member, each im
peller member comprising an impeller blade con
15 nected to an annular hub, the annular hub of
each male member having a cylindrical bore
adapted to vengage over a respective boss with a
journal ?t, the hub of each female member ?t
ting over the hub of a respective male member,
said shaft being supported within the circular
openings formed in said bosses‘, a pair of im
peller members being positioned within each an
nular recess, each impeller blade being positioned
within a respective longitudinal slot formed in
25 a roller member and extending through a regis
tering peripheral opening in an associated cyl
indrical slot.
,
2. A rotary pump comprising a shaft, a body
member supported on said shaft and having at
30 each end thereof an annular recess arranged con
cessQa cylindrical roller member disposed in each
slot
slot
ing,
nal
and having at one end thereof a transverse
registering with a respective lateral open
each roller being provided with a longitudi
slot intersecting said transverse slot, the
length of ‘each roller being substantially equal
to the length of said body member, a casing for
said body member, a plate for closing each end
of the casing, each plate being provided with
an inwardly projecting boss positioned coaxially 10
with respect to the axis of the ‘casing, each boss
having a circular opening therein positioned ec
centric with respect to the axis of the casing, an
impeller assemblage comprising a pair of im
peller members respectively supported upon each 15'
boss for rotation about said axis, each pair com
prising a male impeller member and a female
impeller member, each impeller member compris
ing an impeller blade connected to an annular
hub; the annular hub of each male member hav 20
ing a cylindrical bore adapted to engage over a
respective boss with a journal fit, the hub of each
female member ?tting over the hub of a respec
tive male member, said shaft being supported
within the circular openings formed in said 25
bosses, a pair of impeller members being posi
tioned within each annular recess, each impeller
blade being positioned within a respective longi
tudinal slot formed in a roller member and ex
tending through a registering peripheral open 30
ing in an associated cylindrical slot, each blade
centrically to the axis of the shaft, the outer
portion of said member being provided with a _ being connected to its associated hub by a radial
plurality of cylindrical slots, said slots being open portion which is positioned within a respective
along the peripheral surface of said member-and transverse slot formed in the roller member which
having lateral openings communicating at each > engages said blade.
35
end of the slot respectively with an annular re
EDWARD W. 'I'ILTON.
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