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Патент USA US2407349

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Patented Sept. 10, 1946
2,407,348
p F }
UNITED STATES PATENT OFFICE
2,407,348
,
IMPELLER MOUNTING
Rudolph D. Schott, Los Gatos, Calif., assignor,
by mesne assignments, to Fairbanks, Morse &
00., a corporation of Illinois
Application December 22, 1943, Serial No. 515,201
9 Claims.
(01. 287—52.06)
1
2
My present invention relates to centrifugal or
impeller-type pumps, and more particularly to
an improved means for adjusting and ?rmly se-'
’
peller is associated. For example, in centrifugal
pumps of the impeller type, which have impel
lers of the semi-open type that rotate in close
curing the impellers and/or propellers of such a
proximity to stationary parts, the clearances
pump upon a driving shaft.
must necessarily be very small and, therefore, it
’
a
An object of the invention is to provide a sim
ple, practical and effective means for securing an
is a further, object of my invention to provide a
means which will permit of a close adjustment in
impeller or propeller of a centrifugal or rotary
_ the position of the impellers with respect to each
pump upon its driving shaft.
other upon the shaft and thus meet the above re
Another object of the invention isvto provide 10 quirements in a novel and emcient manner.
Other objects and advantages of the invention
an improvement in connection with a tapering
sleeve-type of mounting for rotary impellers by '
will be in part evident to those skilled in the art
which the position of the tapering sleeve may be
and in, part ‘pointed out hereinafter in'the fol
adjusted and held in a ?xed position upon the
lowing description taken in connection with the
impeller driving shaft.
15 accompanying-drawing, wherein there is shown
Another object of the invention is to provide a byway of illustration and not of limitation pre
positively acting means for positioning the
ferred embodiments thereof.
mounting sleeves of a number of impellers or pro
pellers upon a driving shaft in such a manner
In the drawing: -
Figure 1 is a vertical sectional view showing
that the impellers and/or propellers will be 20 two forms which the invention may take,
spaced in proper clearance relation with adja
Figure 2 is an enlarged fragmentary view
cent cooperating surfaces when moved upon the
shotvingcletails of one of the forms of the inven
sleeve to produce the friction necessary'to pro
vide the holding ?t required.
’
tion illustrated in Figure 1 of the drawing, and
Figure 3 is a perspective view showing details
Another object of the invention is to provide 2.5 of one of the parts.
.
a means for mounting impellers and/or propel
For the purpose of illustrating and describing
lers of a centrifugal pump upon a common shaft,
my present invention, I have, in Figure 1' of the
which will permit of adjustment where it is im
drawing, shown a pumping unit comprising an
possible to predetermine their exact positions up
upper shroud orgbowl-like ,member ID having an
on the shaft prior to their ?nal assembly.
7 3,0 internal shroud ll between which vertical ?uid
g It has heretofore been common practice, in the
construction of centrifugal pumps, and more es
circulating conduits are formed.
Immediately
below theshroud or bowl-like member In there
pecially in the vertical turbine- and impeller
is a second shroud or bowl-like member I2 hav
pumps having multiple stages, to fasten or posi
ing an internal‘shroud I 3 which likewise forms
tion each of the impellers by means of, a split :35 other ~; fluid I directing columns, and below the
bushing which is externally threaded to receive
shroud or bowl-like, member l2 there is an intake
a nut that serves to move the impeller along the
outside tapered surface of the bushing to there
by tighten the bushing upon the shaft and grip
shroud, or, bowl» M which has a centrally dis
posed bearing hub 15.
Extending through the
shrouds, l I, i3 and the bearing hub Hi there is an
the shaft to thus produce a frictional driving 40 impeller'driving shaft I6 upon which impellers
connection between the shaft, bushing and im
I‘! and I8 are mounted. The shaft i6 is also here
peller as the nut is turned upon the split and ta
shown as journaled in water lubricated bearings
pered bushing. Such an arrangement is shown
I9, 24) and 2| whichare respectively carried by
in my prior Patent No.’ 2,273,420, issued February
the shrouds H and I 3 and the bearing hub l5,
17, 1942 and entitled Centrifugal pump. With V45 Extendingdownwardly from the intake shroud
this prior arrangement it will be obvious that the
or bowlv lllthere is an intake pipe 22, and extend
ing upwardly from the shroud or bowl-like mem
amount of torque that can be transmitted from
the shaft to the impeller will be ,dependentnot
ber. I i! there‘ is a discharge pipe 23.- As is well
only upon the amount of contact between the
understood-in ‘the art, the unit above described
parts, but also upon the character of the contact 50 may constitutea complete pumping unit, or a
number of these units may be mounted in end
surfaces between the several parts.’ In; most
to end relationship to form any'desired numberv
pumps of this type it is also important that the
axial positionof the impeller upon its driving
of stages depending upon the pumping head.
Except for the rotatable driving shaft I6 and
shaft be rigidly‘ maintained with reference to the
?uid directing shroud or bowl-with which the imf 55 the impellers l1 and I8,~the above described
4
parts constitute the principal stationary portions
of the pumping unit. As suggested above, these
parts provide fluid directing conduits through
which the ?uid is directed upwardly from the ro
tary elements or impellers I‘? and !8.
In Figure
l the impeller H is shown as secured to the driv
threaded members 28 and 36 described above
may be in the form of split externally threaded
nuts having two similar parts 40 and Al with
matching threads £52 and providing a cylindrical
bore 43 extending therethrough for the shaft l6
when the pa ‘ts are assembled together upon the
shaft.
ing shaft it by means of a preferred arrange
While I have, for the sake of clearness and
ment that will be described in greater detail in
in order to disclose the invention so that the
connection with Figure 2 of the drawing. How
ever, before describing this embodiment, atten 10 same can be readily understood, described and
illustrated a particular arrangement, I desire to
tion is directed to the manner in which the im
have it understood that the invention is not lim
peller i3 is secured upon the driving shaft l6.
ited to the speci?c form disclosed, but may be
At this point it will be noted that the impeller
embodied in other ways that will suggest them
!8 has a central hub 24 which has an internally
tapered bore that is adapted to ?t over the ta 1:3 selves to persons skilled in the art. It is believed
that this invention is new and all such changes
pered external surface of a split sleeve 25. This
as come within the scope of the appended claims
split sleeve 25 has an externally and internally
threaded end 26 with which two threaded mem
are to be considered as part of this invention.
bers 21 and 28 cooperate.
Having thus described my invention, what I
claim and desire to secure by Leters Patent is:
1. In a device of the character described, the
combination of a cylindrical shaft, a split cyline
drical bushing having a tapered external surface
As here shown, the
threaded member 2'! is in the form of a ?uted or
crown nut which is threaded upon the external‘
threads of the sleeve 25 so as to force the hub 24
of the impeller it downwardly thereover and in
tight clamping relation thereupon. At this point
it will also be noted thatrthe threaded member
23, which it should be explained is formed in two
I adapted to be clamped upon said shaft, a mem
her having
hub with a tapered bore mounted
upon said bushing, means operating to force the
hub of said member into clamping relation upon
complementary halves, is seated in an undercut
said, bushing, and means ?xed against axial
portion 29 and abuts upon a shoulder Bil thus
movement carried by said shaft and engaging
formed upon the driving shaft Iii. With this ar
rangement it will be readily seen that when the 30 said bushing for retaining said bushing in any
desired axial position upon said shaft.
threaded member 23 is properly adjusted and in
2. In a device of the character described, the
abutment with the shoulder 38 upon the shaft
combination of a-cylindrical shaft having an an
it, it will serve to hold the tapered sleeve 25
nular shoulder extending thereabout, a cylin
against any downward axial movement upon the
drical bushing having a tapering external sur
shaft 55 during the ?nal tightening of the crown
face threaded at its smaller end, said bushing
or fluted nut 2?, and after the assembly opera
being also internally threaded at its smaller end
tions are completed, the impeller will be ?rmly
where it is adapted to extend over the shoulder
held against any downward displacement upon
formed upon said shaft, a member having a cor
the shaft l6.
responding internally tapered portion mounted
Reference is now made to Figure 2 of the draw
upon said bushing, threaded means engaging the
ing ‘for a more detailed description of the manner
threads upon the external surface of said'cylin
in which the impeller I‘! is secured upon the driv
drical bushing operating to force said member
111g‘ shaft it. As here shown, the driving shaft
into tight ?tting engagement with said bushing,
46 is also provided with an undercut portion 3!
and threaded means engaging the internal
which will form a shoulder 32 and, like the pre—
threads of said bushing and the annular shoulder
viously described arrangement, there is. a split
externally tapered sleeve 33 having an externally
and internally threaded end 34 with which
of said shaft for securing said bushing against
axial displacement upon said shaft.
3. In a device of the character described, the
threaded members 35 and 3S cooperate, as above
described. In addition to these means, this em 50 combination of a cylindrical shaft having means
forming a shoulder thereabout, means forming
bodiment of the invention contemplates the pro
a tapering external surface about said shaft and
vision of a further securing means in the form
having external screw threads at its smaller end,
of a relatively flat key 31 that is seated in a key—
said last named means also having an internally
way 88 formed in the driving shaft I6 and ex
threaded portion adapted to extend over said
tends between the split forming ends of the ex
shoulder forming means, a member mounted
ternally tapered sleeve 33 and into engagement
upon said bushing, threaded means engaging the
with a keyway 39 formed in the hub of the im
external threads upon the means forming the
peller ill. The provision of this additional means
tapering external surface about said shaft oper
will insure against any relative circumferential
displacement between the parts during the as 60 ating to hold said member in tight ?tting engage
ment with said external surface forming means,
sembly operation, as when the threaded mem
and threaded means engaging the means forming
bers 35 and 36 are being turned into their ?nal
said shoulder and the internally threaded por
positions, and will also serve to supplement the
tion of said tapering external surface forming
frictional driving connection between the shaft
means for adjustably securing said tapering ex
and sleeve and the tapered hub of the impeller.
ternal surface forming means in any desired
As a modi?cation of this form of mounting, it
axial position upon said shaft.
will be understood that, if desired, two separate
-4. Ina device of the character described, the
keys may be substituted for the key 31 by form
ing complementary keyways in the tapered sleeve
combination of a cylindrical shaft having an an
33 which will permit the use of one key between
the shaft if; and the inside of the tapered sleeve
nular recess extending thereabout, a split cylin
33, and another key between the tapered outside
drical bushing adapted to surround said shaft
and having a tapering external surface, said
surface of the sleeve 33 and the hub of the im
bushing being internally threaded and adapted
peller n.
to extend over the recess in said shaft, an im
'
As shown in Figure 3 of the drawing, the 75 peller having a hub with a correspondingly ta
5
2,407,348
pered bore adapted to be mounted upon said
bushing, and threaded means of at least two
, parts positioned in the annular recess of said
extension at its smaller end, said bushing being
also internally threaded within said extension
and adapted to extend over the recess out in said
shaft, a key disposed in the keyway‘of said shaft
bushing for adjustably securing said bushing in
and extending between the'split forming ends of
any desired axial position with respect to the re
said cylindrical bushing, an impeller having an
cess in said shaft.
internally tapered hub and a keyway engaging
5. In a device of the character described, the
said key mounted upon said bushing, threaded
combination of a cylindrical shaft having a shoul
means engaging the external threads of said
der extending thereabout, a split cylindrical 10 cylindrical bushing operating to force said im
bushing adapted to surround said shaft and hav
peller hub into tight ?tting engagement with
ing a tapering external surface, said bushing be
said bushing, and an externally threaded means
ing internally threaded and adapted to extend
disposed in said recess and engaging the internal
over the shoulder extending about said shaft, an
threads of said bushing for adjustably securing
impeller having a hub with a correspondingly 15 said bushing in any desired axial position prior
tapered bore adapted to be mounted upon said
to a tightening of said threaded means upon the
bushing, and an externally threaded nut formed
external threads of said bushing, all whereby the
in two parts positioned against said shoulder
ultimate position of said impeller upon the shaft
and engaging the internal threads of said bush
may be accurately determined.
ing for adjustably securing said bushing in any 20
8. In a device of the character described, the
desired axial position with respect to the shoul
combination of a driving shaft having a recess
der upon said shaft.
extending thereabout, an externally tapered com
6. In a device of the character described, the
pressible bushing means adapted to be clamped
combination of an impeller driving shaft having
upon said driving shaft, an impeller having a
a portion forming a shoulder thereupon and an 25 tapered bore adapted to be moved axially over
axially extending keyway therebelow, a split cy
said bushing to exert a clamping force there
lindrical bushing having a tapering external im_
upon, whereby the impeller will be frictionally
peller hub supporting surface, said bushing being
secured upon said driving shaft, and means car
internally threaded at its smaller end and adapted
'ried by said bushing and engaging the recess in
to extend over the shoulder formed upon said
said shaft for retaining said bushing in a prede
shaft, a key disposed in the keyway of said shaft
termined axial position upon said driving shaft.
and extending between the split forming ends of
9. In a device of the character described, the
said cylindrical bushing, an impeller having a
combination of a driving shaft having a shoulder
keyway engaging said key and mounted upon said
formed thereupon, an externally tapered com
bushing, and threaded means cooperating with 35 pressible bushing means adapted to be clamped
said shoulder and the internal threads of said
upon said driving shaft, an impeller having a
bushing for axially adjusting said bushing inde
tapered bore adapted to be moved axially over
pendently of said key to any desired position with
said bushing to exert a, clamping force thereupon,
respect to the shoulder upon said shaft.
whereby the impeller will be frictionally secured
7. In a device of the character described, the 40 upon said driving shaft, and adjustable means
combination of an impeller driving shaft having
carried by said bushing and engaging the shoul
an annular recess cut thereabout and an axially
der upon said shaft for retaining said bushing in
extending keyway cut therebelow, a split cylin
any desired axial position upon said driving
drical bushing having an externally tapering
shaft.
impeller hub supporting surface with a threaded
RUDOLPH D. SCHOTT.
shaft and engaging the internal threads of said
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