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Publication numberUS3826595 A
Publication typeGrant
Publication dateJul 30, 1974
Filing dateMar 7, 1973
Priority dateMar 7, 1973
Publication numberUS 3826595 A, US 3826595A, US-A-3826595, US3826595 A, US3826595A
InventorsBottoms H
Original AssigneeLucas Industries Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrically driven pump
US 3826595 A
Abstract
An electrically driven pump has a housing which contains the stator and rotor of an electric induction motor. A portion of the liquid urged through the pump by an impeller driven by the rotor is passed through the bearings of the pump and across the stator windings before returning to the pump inlet.
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Description  (OCR text may contain errors)

United States Patent [191 Bottoms [111 3,826,595 [451 July 30, 1974 ELECTRICALLY DRIVEN PUMP [75] Inventor: Harry Simister Bottoms, Solihull,

England [73] Assignee: Joseph Lucas (Industries) Limited,

Birmingham, England [22] Filed: Mar. 7, 1973 [21] Appl. No.: 338,959

52 Us. c1. 417/370 [51] Int. Cl. F04b 17/00 [58] Field of Search 417/370, 371

[56] References Cited UNITED-STATES PATENTS 2,321,126 6/1943 Breuer'm, 417/371 2,520,880 8/1950 Harlamoff '417/370 2,911,918 11/1959 Reed 417/370 3,220,350 11/1965 White 417/370 3,288,073 11/1966 Pezzillo 417/370 3,618,337 11/1971 Mount 417/371 3,644,067 2/1972 Yowell 417/370 Primary Examiner-C. J Husar Attorney, Agent, or Firm-Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson 57 ABSTRACT An electrically driven pump has a housing which contains the stator and rotor of an electric induction motor. A portion of the liquid urged through the pump by an impeller driven by the rotor is passed through the bearings of the pump and across the stator windings before returning to the pump inlet.

4 Claims, 2 Drawing lFigures PATENTEuJummM SHEET 2 [IF 2 1 ELECTRICALLY DRIVEN PUMP This invention relates to electrically driven axial-flow pumps forliquids.

According to the invention a pump of the type specitied comprises a casing having an inlet and an outlet and containing a housing which supports the stator and rotor of an electric induction motor, a shaft rotatable in bearings in the said housing and forming part of the said rotor, an impeller carried by the shaft within the inlet of the casing, an axial passage between the casing and the housing and connecting the inlet and outlet and through which, in use, the greater part of the liquid flows, and means for directing a part of the said liquid through the bearings and past the stator windings before returning it to the inlet.

A pump according to the invention will now be described by way of example and with reference to the accompanying drawings in which:

FIG. 1 shows a section through the housing; and

FIG. 2 shows a section through the pump on the line 2--2 in FIG. 1.

A casing having an inlet 8 and an outlet 9 comprises a body 11, a diffuser 12 and end members 13, 14. The body 11, diffuser 12 and end member 14 include a housing comprising inner portions l7, l8, l9 respectively which are supported by webs 20, 21, 22. The webs 20, 21, 22'define aligned axial passages 23, 24, between the casing and the housing. The body 11, diffuser 12 and end members 13, 14 are sealingly secured together by bolts 15 which extend axially of the pump through holes 16 in the webs 20, 21, 22.

The inner portion 17 of the body 11 forms a mounting for stator windings 35 of an electric induction motor. A hollow shaft 24 is rotatable in bearings 36, 38 in the inner portions 18, 19 of the diffuser 12 and end member 14 respectively and forms part of the rotor of the induction motor. Thrust bearings 27, 28 prevent axial movement of the shaft 34.

An impeller 29, of generally helical form, is secured to one end of the shaft 24 by means of a bolt 30 and a nut 31 engaging an internal shoulder on the shaft 24. The bolt 30 has a substantially conical head 32 and an axial bore 33 through which the interior of the shaft 24 communicates with the inlet 8. The position of the shaft 24 is such that a gap 3.9 exists between the impeller 29 and the diffuser 12.

Liquid entering the inlet 8 is urged by the impeller29 through the passages 24, 23, 25 to the outlet 9. Vanes (not shown) in the passages 24 tend to produce a substantially axial flow of liquid after it has left the impeller 29. A part of the liquid leaving the impeller 29 passes through the gap 34 and the bearings 38, 27, around the windings 23, through the bearings 28, 36 and via the interior of the shaft 34 and the bore 33 to the inlet 8, thereby providing lubrication for the bear ings and assisting in the conduction of heat away from the windings 23.

I claim:

1. An electrically-driven axial-flow pump for a liquid, comprising a casing having an inlet and an outlet and containing a housing which supports the stator and rotor of an electric induction motor, a shaft rotatable in bearings in said housing and forming part of said rotor, an impeller carried by the shaft within the inlet of the casing, an axial passage between the casing and the housing and connecting the inlet and outlet and through which, in use, the greater part of the liquid flows, and a further flow passage interconnecting the upstream and downstream sides of the impeller to direct a part of said liquid past the windings before returning it to the inlet, said further flow passage comprising said bearings in series with a space surrounding said windings whereby that part of said liquid which flows past said windings also flows through said bearings.

2. A pump as claimed in claim I in which the casing and the housing each comprise a plurality of axially aligned parts, the casing parts being formed integrally with the housing parts.

3. A pump as claimed in claim 2 in which the means for directing a part of the liquid through the bearings leave the housing.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2321126 *Apr 3, 1941Jun 8, 1943Breuer Electric Mfg CoDust-tight blower
US2520880 *Oct 6, 1945Aug 29, 1950Smith Corp A OCentrifugal pump
US2911918 *Nov 26, 1956Nov 10, 1959Smith Corp A OPump
US3220350 *Sep 3, 1964Nov 30, 1965Crane CoMotor driven pump
US3288073 *Dec 1, 1964Nov 29, 1966Pall CorpCanned pump having reduced hydraulic thrust
US3618337 *Jun 22, 1970Nov 9, 1971Carrier CorpHermetic refrigeration compressor
US3644067 *May 25, 1970Feb 22, 1972Sperry Rand CorpPower transmission
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4747757 *Nov 26, 1986May 31, 1988Haentjens Walter DSubmersible mixing pump
US5949171 *Jun 19, 1998Sep 7, 1999Siemens Canada LimitedDivisible lamination brushless pump-motor having fluid cooling system
US6111334 *Mar 3, 1999Aug 29, 2000Siemens Canada LimitedDivisible lamination brushless pump-motor having fluid cooling system
US6175173Sep 14, 1999Jan 16, 2001Wilo GmbhTube pump
US6447269 *Dec 15, 2000Sep 10, 2002Sota CorporationPotable water pump
DE4108257A1 *Mar 14, 1991Sep 19, 1991Allweiler AgMagnet coupling pump - incorporates radial and axially supported shaft carrying flywheel with at least one passage from suction chamber to pressure chamber
DE10047387B4 *Sep 25, 2000Sep 12, 2013GPM Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt, MerbelsrodElektrisch angetriebene Kühlmittelpumpe
DE19842169A1 *Sep 15, 1998Mar 16, 2000Wilo GmbhCirculating pump which is driven by electric motor controlled by electronic unit which is arranged completely inside pump housing
EP0657654A1 *Nov 25, 1994Jun 14, 1995Westinghouse Electric CorporationFluid pump
EP0746683A1 *Jul 22, 1994Dec 11, 1996William F. HackettPump with fluid bearing
EP0913582A1 *Oct 8, 1998May 6, 1999Siemens Canada LimitedPump motor having sumbersible stator and rotor
EP0913910A1 *Oct 15, 1998May 6, 1999Siemens Canada LimitedPump motor having fluid cooling system
EP1191232A2 *Aug 23, 2001Mar 27, 2002GPM Geräte- und Pumpenbau GmbHElectric driven cooling pump
Classifications
U.S. Classification417/370
International ClassificationF04D13/06, F04D29/06
Cooperative ClassificationF04D29/061, F04D13/06
European ClassificationF04D29/06P, F04D13/06