U.S. patent number 3,841,791 [Application Number 05/257,583] was granted by the patent office on 1974-10-15 for adaptor and frame for a centrifugal pump.
This patent grant is currently assigned to Worthington Corporation. Invention is credited to John H. Doolin.
United States Patent |
3,841,791 |
Doolin |
October 15, 1974 |
ADAPTOR AND FRAME FOR A CENTRIFUGAL PUMP
Abstract
Centrifugal Pump Means to provide selectively close coupled
centrifugal pump means and separately coupled centrifugal pump
means from a wide variety of interchangeable modular components
including respectively pluralities of different, interchangeable
pump casings, pump impellers, pump drive shafts, adaptors, pump
drive means and shaft seals each of which may be readily and
conveniently operatively connected to each of the other stated pump
components to thereby enable the provision of a very wide variety
of different centrifugal pump means taking either close or
separately coupled form, each of which is particularly suitable for
a group of different pumping applications, without requiring the
manufacture and inventory of a wide variety of completed pumps.
Inventors: |
Doolin; John H. (New
Providence, NJ) |
Assignee: |
Worthington Corporation
(Harrison, NJ)
|
Family
ID: |
22976881 |
Appl.
No.: |
05/257,583 |
Filed: |
May 30, 1972 |
Current U.S.
Class: |
415/175; 415/206;
415/912; 415/143; 415/230; 417/423.12 |
Current CPC
Class: |
F04D
29/628 (20130101); F04D 29/426 (20130101); Y10S
415/912 (20130101); F05B 2230/601 (20130101) |
Current International
Class: |
F04D
29/42 (20060101); F04D 29/60 (20060101); F04D
29/62 (20060101); F04d 029/04 (); F04d
029/42 () |
Field of
Search: |
;415/112,17A,175,213,143
;417/423 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Raduazo; Henry F.
Attorney, Agent or Firm: Bobis; Daniel H.
Claims
What is claimed is:
1. A two piece adaptor in combination with a frame including a
bearing cartridge for the driven shaft of a separately coupled
centrifugal pump having, a pump casing with an impeller therein
connected to and rotatable with the driven shaft, said two piece
adaptor includes:
a. an end cover and seal assembly about the driven shaft,
b. a connecting bracket independent of said end cover and seal
assembly and said frame dispose about the shaft and spaced
therefrom having a first connecting means at one end for connecting
the adaptor to the back end of the casing, and at the end remote
therefrom a second connecting means for connecting the connecting
bracket to the frame,
c. means forming a seal between said connecting means and said end
cover and seal assembly, and
d. the frame includes, support means for said connecting bracket at
the end remote from the connecting means to support one end of said
bearing cartridge in assembled position.
2. A two piece adaptor as claimed in claim 1 including a cooling
jacket about the bearing cartridge, and means for continuously
supplying a cooling medium to said cooling jacket.
3. In a two piece adaptor as claimed in claim 1 wherein the bearing
cartridge has spaced double rows of roller bearings, and means on
said bearing cartridge for lubricating the roller bearings.
4. A two piece adaptor as claimed in claim 1 wherein the end cover
and seal assembly has means therein operatively connectable to a
mechanical seal, and said means adaptable to convert to a stuffing
box interchangeable and selective.
5. A two piece adaptor as claimed in claim 1 wherein the end cover
and seal assemnly has means thereon to form a stuffing box, and
said means adaptable to be operatively connectible to a mechanical
seal interchangeably and selectively.
6. A two piece adaptor as claimed in claim 1 wherein the support
means for said connecting bracket comprises,
a. a body member having means for connecting the body member to the
connecting bracket,
b. leg means on said body member at the end remote from the
connecting bracket,
c. and said body member having means to dispose said body member in
snug engagement with the connecting bracket and to fix said body
member at an angle to the longitudinal line of the connecting
bracket in assembled position.
Description
BACKGROUND OF THE INVENTION
Although centrifugal pump means having some interchangeable
components are known, the provision for a wide variety of different
centrifugal pump means, each particularly suitable for a different
pumping application, will require the manufacture and inventory of
a corresponding wide variety of completed pumps a significant
competitive disadvantage from a financial viewpoint because of the
money tied up in inventory.
In those prior art centrifugal pumps wherein major pump components
are interchangeable, it has been found that replacement of one or
more of such major pump components by other and different
components to adapt the same centrifugal pump means to a materially
different pumping application will generally involve relatively
involved and time consuming procedures and require the use of
specialized fittings and the like to effect the desired
modification.
The present invention overcomes this problem by providing a wide
variety of close coupled and separately coupled centrifugal pump
means for a group of different pump applications which utilizes
separate, different and independent forms of casings, impellers,
driving means for the impeller including, driven shafts connectable
to the impellers, adaptors, and seal means for the driven shafts;
each readily and conveniently interchangeable with other of the
same elements without requiring the manufacture and inventory of
large numbers of completed pumps.
The close coupled centrifugal pump means and separately coupled
centrifugal pump means of the present invention requires only
readily available relatively simple components of proven
dependability in the fabrication thereof so that any given pump
means which is formed from such interchangeable elements will
provide long periods of satisfactory maintenance-free pumping
operation and will be competitive in the commercial market place
with centrifugal pumps manufactured for the same application.
SUMMARY OF THE INVENTION
Thus the present invention covers apparatus to provide selectively,
close coupled and separately coupled centrifugal pump means, from
interchangeable modular components including a plurality of
different, interchangeable casings each having an identical back
opening, a plurality of different interchangeable impellers each of
which may be disposed in each of said casings, a plurality of
different interchangeable drive shafts each of which may be
extended onto each of said casings and operatively connected
therein to each of said impellers, a plurality of different,
interchangeable adaptors each having an identical connecting means
at one end to permit any given adaptor to be connected to the back
end of each of said casings, different, interchangeable drive
means, each of which may be connected to each of said adaptors and
each of said pump drive shafts to drive the pump, and different
interchangeable seal means operable with a selected adaptor means
to close said back opening of the selected casing configuration, at
least one adaptor and an associated seal means connectable between
a selected casing and a selected drive means to form the desired
close coupled centrifugal pump means, and at least one other
adaptor and an associated seal means selectively and alternatively
connectable in place of said first mentioned one adaptor and
associated seal means for mounting between a selected casing and a
selected drive means to form the separately coupled centrifugal
pump means.
DESCRIPTION OF THE DRAWINGS
The above and other objects and advantages of this invention are
believed made clear by the following detailed description thereof
taken in conjunction with the accompanying drawings wherein:
FIG. 1 is a side elevational view of a close coupled pump
constructed and operative in accordance with the teachings of the
invention,
FIG. 2 is an end elevational view of the pump of FIG. 1.
FIG. 3 is a vertical cross sectional view taken through the pump to
FIG. 1.
FIG. 4 is an exploded view of the pump of FIGS. 1 to 3 with parts
cut away and parts in cross section.
FIG. 5 is a vertical cross sectional view taken through the inlet
of the pump of FIGS. 1 - 4 illustrating an optional inducer,
FIG. 6 is a side elevational view of a separately coupled pump
constructed and operative in accordance with the teachings of the
invention and which comprises an open bearing frame or
cartridge,
FIG. 7 is an end elevational view of the pump of FIG. 6.
FIG. 8 is a side elevational view of an enclosed bearing frame or
cartridge for alternative use in the pump of FIG. 6,
FIG. 9 is a vertical cross sectional view taken through the pump of
FIG. 6 but incorporating the enclosed bearing cartridge of FIG. 8
therein,
FIG. 10 is a side elevational view with parts broken away and parts
in cross section of a modified form of the enclosed bearing frame
or cartridge of FIG. 8,
FIG. 11 is an exploded view with parts cut away and parts in cross
section of the pump of FIG. 9,
FIG. 12 is a vertical section taken at line 12--12 of FIG. 9 to
show the support means operatively associated with the adaptor,
FIG. 13 is a vertical cross sectional view of a portion of the pump
casing of FIG. 9 illustrating the use of a shroudless impeller and
adjustable shroud therein,
FIG. 14 is a side elevational view of another form of closely
coupled pump of the invention which includes a one piece
adaptor,
FIG. 15 is a side elevational view of another form of pump
casing,
FIG. 16 is a side elevational view of a vertically oriented,
separately coupled pump in accordance with the invention partly
broken away to show the back portion of the casing,
FIG. 17 is a side elevational view of a two-piece adaptor pump
casing combination of the invention partly in vertical section,
FIGS. 18 and 19 are respectively side elevational views of the two
pieces of the adaptor of FIG. 16.
FIG. 20 is another form of vertically oriented separately coupled
pump in vertical section to show the arrangement in accordance with
the present invention.
CLOSE COUPLED CENTRIFUGAL PUMP MEANS
Referring now to FIGS. 1 - 4, a close coupled centrifugal pump
constructed and operative in accordance with the teachings of this
invention is indicated at 30 and comprises a pump end or pump
casing 31.
Pump casing 31 is generally cylindrical in shape and has the usual
suction inlet 32 internally threaded as at 33 and a discharge
outlet 34. The side remote from the suction inlet forms a back
opening 35 having a counterbore 36 forming a shoulder as at 37. The
form of this back opening though relatively simple is important
because it serves as one of the techniques to enable
interchangeability of the casings with any of the desired forms of
adaptors at 38.
Adaptor 38 is a one piece adaptor and the pump is driven
therethrough, as described in detail hereinbelow, from an electric
drive motor 40. Support lugs 39a and 39b are respectively formed as
shown on the pump casing 31 and the housing of electric drive motor
40 to permit this form of pump to be maintained in alignment on
either suitable mounting means or a baseplate, not shown.
The one piece adaptor 38 has a cup-like configuration as shown in
FIGS. 3 and 4 and comprises a front wall portion 42, having a
casing wearing ring 44 disposed therein which in assembled position
will form the back cover plate of the pump casing. The adaptor 38
is attached to the pump casing 31 by attachment bolts 46 extending
through an attachment flange 48 on the adaptor and into threaded
bores 47 on said pump casing. In like manner, the adaptor 38 is
attached to the housing of drive motor 40 by attachment bolts 50
which pass as shown through adaptor attachment flange 52 into
suitable threaded bores 51 in said motor housing. Drain and gauge
connection plugs 53 and 55 are provided as shown in pump casing
32.
The motor drive shaft is indicated at 54 and extends as shown
through the adaptor 38 into the pump casing 31. The centrifugal
pump impeller is indicated at 56 and is of the shrouded type. The
impeller includes balancing ports 57 and is attached as shown
directly to the motor drive shaft by an attachment bolt 58 and a
key 59. A casing wearing ring 60 is disposed as shown in the pump
casing 31 adjacent the forward edge of the impeller 56.
A flexible mechanical seal is indicated generally at 62 and is
disposed in a seal housing 63 formed as an integral part of the one
piece adaptor 38. The seal 62 is carried from a rotatable shaft
sleeve 64 and includes a spring assembly 66 and a seal ring 68
which is pressed into sealing contact with a non-rotatable seat
member 70 carried by the adaptor 38.
Referring now to FIG. 5, an optional inducer of the depicted
helical form is indicated at 72 and is attached as shown to the end
of drive shaft 54 just ahead of impeller 56 by an integral
attachment bolt 74. Bolt 74 acts in place of the attachment bolt 58
and will hold the inducer 72 and the impeller 56 on shaft 54 as is
shown in FIG. 3 of the drawings.
SEPARATELY COUPLED CENTRIFUGAL PUMP MEANS
A separately coupled or bearing supported pump constructed and
operative in accordance with the teachings of this invention is
indicated at 80 in FIGS. 6, 7, 9 and 11 and comprises a pump casing
82, a two-piece adaptor 84, a bearing frame or cartridge 86 and an
electric drive motor 88. The latter includes a shaft 90 which is
coupled as shown by a quick-detachable coupling 92 to the pump
drive shaft 94.
Support means 96, 98 and 100 are respectively provided on the pump
casing 82, adaptor 84 and the drive motor 88. The support means 98
operatively connected to the adaptor differs from the conventional
prior art practice which heretofore placed the medially disposed
support under the bearing cartridge of the separately coupled
pumping arrangements.
Where supports were provided under the bearing cartridge distortion
of the bearing cartridge around the driven shaft occurred.
The overall effect of bringing the medial support means 98 in as
shown in FIGS. 6 and 9 of the drawing is to cut the overhang
bending load of the bearing cartridge around the shaft by one-half.
The effect of this change is to reduce the support load on the
bolts connecting the bearing cartridge to the adaptor as is more
fully described hereinafter.
Further, the effect of this change in the support is to eliminate
or insure against possible internal distortion in the bearing
cartridge.
Additionally the medially disposed support 98 allows room for the
cooling jacket sleeve about the bearing cartridge as will also be
more fully described below.
The medially disposed support 98 is shown in FIGS. 6, 9, 11 and 12
as a primarily solid float body member generally designated 99
which in assembled position will be slotted angularly to the
longitudinal line of the pump 84. At one end an arcuated curved
flanged member 99a is found which is shaped to snugly engage and
fit the curved outer face of any associated adaptor means to which
it is connected by a suitable medially disposed bolt member 99b
which extends through the flanged member 99a into a threaded bore
as at 99c. At the end remote from the flanged member 99a a pair of
spaced legs as at 99d and 993 are respectively provided with
support pads as at 99f and 99g.
The pump casing 82 includes a flanged inlet 102 and a centerline
discharge flanged outlet 104.
As in the case of the close coupled pump 30 above described the
casing 82 is provided with a substantially similar back opening 83
counterbore 83a and shoulder 83b which receives the two-piece
adaptor 84.
The two-piece adaptor 84 comprises a generally cylindrical housing
106 having a core-like member 108 fitted thereinto as shown and
which in turn includes the back plate 110 of the pump casing 82 and
a shaft packing mounting section 112 formed integrally therewith.
An "0" ring 114 maintains the requisite seal between the section
112 and housing 106, and casing wear rings 116 and 117 are disposed
as shown in the back plate 110 and the pump casing 82 for obvious
purpose. The adaptor 84 is attached to the pump casing 82 by
attachment bolts 118 which extend as shown through an attachment
flange 120 into said casing. Drain plugs 119 and 121 are provided
in the pump casing 82 and adaptor 84.
The driven shaft for the pump is indicated at 120 and is of the
depicted stepped configuration. Shaft 120 extends from the coupling
92 bearing cartridge selected as will be described, the adaptor 84
into the pump casing 82. A shrouded centrifugal impeller 122,
having balancing ports 124 formed therein, is attached to the shaft
120 by a key 126, an attachment nut 128 which screws over a
threaded shaft extension 129, and a lock washer 130,
respectively.
A packing assembly is indicated generally at 132 and is disposed as
shown in the adaptor section 112. The packing assembly 132
cooperates in obvious manner with a rotatable shaft sleeve 134 to
prevent leakage of the pumped fluid, and said packing assembly
comprises packing members 136, 138 and 140 which are pressed
tightly together and maintained in position as shown by a packing
nut 142 and a locking bolt 144 which extends through a threaded
aperture 146 provided therefor in said packing nut. The packing
member 138 comprises spaced apertures 148 formed therein for the
supply of the pumped fluid as a lubricant to the packing assembly,
and partially threaded fluid supply ports 150 are formed as shown
in adaptor section 112 to mate with each aperture 148 and enable
the supply of fluid thereto.
An enclosed bearing cartridge is indicated generally at 152 and
comprises a generally cylindrical housing 154 having ball bearing
assemblies 156 and 158 mounted as shown at opposite extremities
thereof by retaining rings 157 and 159. The housing 154 is attached
to the adaptor housing 106 by attachment bolts 160 which extend
through attachment flanges 161 and 162 as are respectively formed
on said bearing cartridge and adaptor housings.
End caps 164 and 166 are provided as shown at opposite extremities
of the bearing cartridge housing 152 to seal the interior thereof,
and are attached to said housing by attachment bolts 168 and 170.
Seals 172 and 174 are provided as shown in the driven shaft
apertues through the end caps. In use, the bearing cartridge 154 is
partially filled with a suitable lubricating oil, and spaced
slingers 176 and 178 are attached to the driven shaft 120 to
promote circulation of said lubricating oil through the bearing
assemblies 156 and 158. The remote extremity of the driven shaft
120 has a keyway 180 formed therein for attachment of the shaft to
the coupling 92 as shown in FIG. 61.
For particularly heavy duty applications, or use in a particularly
hot environment, an annular water jacket casing 181 illustrated in
phantomized form in FIG. 9 will provide a water cooling passage as
at 181a about the bearing cartridge to permit cooling water to be
passed therethrough for cooling the bearing cartridge 84.
MODIFIED BEARING CARTRIDGE
A modified or heavier duty form of the enclosed bearing cartridge
is indicated generally at 182 in FIG. 10. The construction is
substantially similar to bearing cartridge 152 and like parts
therefor have been given the same numbers.
Bearing cartridge 182 differs from bearing cartridge 152 in that
dual ball bearing assemblies are provided at each end of the
cartridge housing 154 and the end cover 164' is modified to mount
this dual arrangement.
Only one of the dual ball bearing assemblies is illustrated in FIG.
10 which shows ball bearing assemblies 183 and 184 as held in the
cup shaped end cover 164' by an end flange 186 about the open end
of end cover 164'.
The end cover is provided with a circumferential flange 187 through
which bolts 188 are passed to hold the end cover 164' in assembled
position on the housing 154 to properly provide bearing support for
the driven shaft 120.
The modified combination of the end cover 164' facilitates assembly
and replacement and provides better support for the ball bearing
assemblies 183 and 184.
REPLACEABLE SHROUD FOR IMPELLER
The utilization of an open impeller with a replaceable shroud in a
selected pump casing such as pump casing 82 is illustrated in FIG.
13. The open impeller is indicated at 192 and the replaceable
shroud at 194. Replaceable shroud is supported in casing 82 by bolt
means 196.
The versatility of the present invention is indicated in this
arrangement because it permits the same casing to be used with a
shrouded or closed impeller or a non-shrouded or open impeller.
The replaceable shroud element is subject to wear and can be
replaced cheaply while the pump is being used with an open
impeller. However, the pump is readily convertible to a shrouded
impeller or back to an open impeller as the user thereof may elect
or require.
This is a significant departure from conventional commercial
practice wherein two casings are designed, one for an open impeller
and one for a shrouded or closed impeller. The replaceable shroud
arrangement of the present invention permits a single casing design
interchangeably adaptable to either impeller arrangement.
ALTERNATE PUMP CASING
Another form of closely coupled pump constructed and operative in
accordance with the teachings of this invention is indicated
generally at 197 in FIG. 14 and comprises a pump casing 198 which
is closely coupled through a one-piece adaptor 200 to an electric
drive motor 202. In this form, the entire pump assembly is
supported from a support stand 204 which is a part of the adaptor
200.
ANOTHER ALTERNATE PUMP CASING
A somewhat different form of pump casing is indicated at 206 in
FIG. 15 and comprises integral support legs formed to each side
thereof and only one of which is visible as indicated at 208 in
FIG. 15.
IN-LINE CENTRIFUGAL PUMP MEANS VERTICALLY DISPOSED
A vertically oriented, separately coupled pump constructed and
operative in accordance with the teachings of this invention is
indicated generally at 210 in FIG. 16 and comprises an in-line pump
casing 211 having a flanged, volute-like inlet 212 and a flanged,
centerline discharge outlet 213.
In-line pump casing 211 similar to pump casing 31 and pump casing
81 is provided with a substantially similar back opening at 214
having a counterbore at 215 and a shoulder at 216 to receive an
adaptor such as the two-piece adaptor as indicated at 218.
Two-piece adaptor 218 is mounted about the pump drive shaft
220.
An electric drive motor is indicated at 222 and is disposed as
shown atop the adaptor 218. The motor 222 includes a drive shaft
224 which in the illustrated form of adaptor utilized will be
coupled to the pump drive shaft by the quick detachable coupling
226. Support for the pump 210 is provided by support posts 228 and
230 which extend downwardly from the bottom of casing 211, and by
support posts 232 and 234 which extend downwardly from the bottom
of casing 212.
ALTERNATE TWO-PIECE ADAPTOR
The two-piece adaptor 218 of FIG. 16 is illustrated in more detail
in FIGS. 17, 18 and 19 in conjunction with a different form of pump
casing as indicated at 236 and which comprises a flanged inlet 238
and a flanged, radially disposed outlet 240.
Adaptor 218 may be seen in these figures as having a cylindrical
housing 242. A core-like member 244 fitted into the cylindrical
housing 242 serves also as the back plate 246 of the pump casing
236 and provides a shaft packing mounting section 248.
The adaptor 218 is attached to the pump casing 236 by attachment
bolts 250 which extend through an attachment flange 252 formed on
the adaptor housing 242.
ANOTHER VERTICALLY DISPOSED CENTRIFUGAL PUMP ARRANGEMENT
FIG. 20 shows still another arrangement utilizing the versatility
of the present invention wherein a vertically oriented pump is
operatively associated with a remote drive means.
Thus the pump casing designated 270 includes a suction inlet 271
and a pump chamber 272 and a radially extending discharge outlet
273.
Casing 270 is open at the back end and is provided with a flange
274 inwardly of the open end which forms the counterbore 275 and a
stop shoulder 276 identical in design to the back openings of all
of the casing designs of the present invention previously
illustrated and described.
Support legs as at 277 and 278 in engagement with the casing 270
may be used to support the pumping arrangement.
A two-piece adaptor generally designated 280 acts to close the back
of the pump casing 270 by connection thereto as hereinafter
described and at the end of the adaptor remote from the end
connected to the pump casing 270 connects with one end of an
elongated pipe 281 which in turn connects to the base of the
coupling support 282 for a driving means, not shown.
The adaptor 280 includes an outer generally cylindrical housing 283
which is provided with attachment flanges as at 284 and 285 at the
respective ends. Attachment flange 284 is a predetermined speed
distance back from the end so that the adaptor can hold an inner
core member 286 in engagement with the shoulder 276 of the casing
270 when connecting bolts extending through the attachment flange
284 connects the adaptor to the back end of pump casing 270.
The core 286 is shown to include the end cover or back plate as at
287 for the pumping chamber and provides a suitable lubricated
bearing arrangement 288 for the driven shaft 289 which is disposed
to extend vertically from suitable bearing means 290 in the
coupling support 282.
The driven shaft 289 extends the length of the elongated pipe 281
through bearing 288 and the core 286 into pump chamber 272 where
the impeller 291 is connected to the end thereof as by a threaded
nut 292.
A very wide variety of combinations of the disclosed pump casings,
impellers, adaptors and/or bearing cartridges other and different
than those described directly hereinablve by way of example, are of
course, possible.
More specifically, should a particular application require, for
example, a close coupled, vertically oriented pump, it may readily
be seen that the one-piece adaptor 38 of FIG. 3 may be interchanged
with the two-piece adaptor 218 of FIG. 15, for use with the pump
casing 212 of the latter figure.
Alternatively, should a separately coupled pump having threaded
inlets and outlets be required, it may readily be seen that the
two-piece adaptor 84 of FIG. 9 could be interchanged with the
one-piece adaptor 38 of FIG. 3 for use with the pump casing 34 of
the latter figure. As another example, if a separately coupled pump
including a bearing cartridge and utilizing the pump casing 32 and
impeller 56 of FIG. 3 were required, as for a heavy duty
application, it is believed clear that the two-piece adaptor 84 and
the bearing cartridge 182 of FIG. 10 could be interchanged with the
adaptor 38 of FIG. 3.
A major advantage of the centrifugal pumps of the invention is the
fact that the different forms of pump casings, pump drive shafts,
pump drive means, pump impellers and adaptors are interchangeable,
each with the others, to thereby enable the ready assembly of pumps
for a variety or a group of different pumping applications without
requiring the manufacture and maintenance of a large stock of
different completed pumps.
While there has been shown and described the preferred embodiment
of the invention, it will be understood that the invention may be
embodied otherwise than as herein specifically illustrated or
described, and that certain changes in the form and arrangement of
parts and in the specific manner of practicing the invention may be
made without departing from the underlying idea or principles of
this invention within the scope of the appended claims.
* * * * *