US3841791A

US3841791A - Adaptor and frame for a centrifugal pump

Info

Publication number: US3841791A
Application number: US00257583A
Authority: US
Inventors: J Doolin
Original assignee: Worthington Corp
Current assignee: Edison International Inc
Priority date: 1972-05-30
Filing date: 1972-05-30
Publication date: 1974-10-15
Anticipated expiration: 1991-10-15
Also published as: GB1440822A; GB1440821A; DE2327262A1; JPS4950504A; GB1440823A

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.

Description

United States Patent 1 Doolin [4 1 Oct. 15, 1974 ADAPTOR AND FRAME FOR A CENTRIFUGAL PUMP [75] Inventor: John 111. Doolin, New Providence,

[73] Assignee: Worthington Corporation, Harrison,

[22] Filed: May 30, 1972 [21] Appl. No.: 257,583

[52] US. Cl 415/170 A, 415/175, 415/D1G. 3,

[51] Int. Cl. F04d 29/04, F04d 29/42 [58] Field of Search ..4l5/112, 170 A, 175, 213, 415/143; 417/423 [56] References Cited UNITED STATES PATENTS 1,714,734 5/1929 Skidmore, Jr 417/424 2,277,333 3/1942 Leopold 417/423 R 3,153,382 10/1964 Blarcom, Jr 417/423 R 3,180,270 4/1965 Arnts et al. 415/175 3,249,057 5/1966 Callahan 417/423 R Primary ExaminerHenry F. Raduazo Attorney, Agent, or FirmDaniel H. Bobis 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.

6 Claims, 20 Drawing Figures IIHHHHHI M ol PAIENTEUHIIT 1 3.841.791

SHEEI 30? 4 FIG. l8 FIG. I7

SHEET t [If 4 11%| mum ADAPTOR AND FRAME FOR A CENTRIFUGAL PUMP 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 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 casdrive 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 l2l2 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 pumpinaccordance 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 separatelycoupled 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 eithersuitable 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 showndirectly 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 PUM 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 twopiece 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 990. At theend 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 easing 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 into said casing. Drain plugs 119 a nd812l are provided in the pump casing 82 and adaptor 4.

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 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 nut142 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. 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 SI-IROUD 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 nonshrouded 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 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. Twopiece 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 v by attachment bolts 250 which extend through an attachment flange 252 formed on the adaptor housing 242.

ANOTHER VERTICALLY DISPOSED CENTRIFUGAL PUMP ARRANGEMENT FIG. 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 whichforms 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 arrangcment.

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 impeller56 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 theadaptor 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.

What is claimed is: I

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 animpeller 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,

0. 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 interchangebracket in assembled position.

Claims

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.

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.