EP0551435B1 - Kreiselpumpe mit integriertem motor - Google Patents

Kreiselpumpe mit integriertem motor Download PDF

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Publication number
EP0551435B1
EP0551435B1 EP91920060A EP91920060A EP0551435B1 EP 0551435 B1 EP0551435 B1 EP 0551435B1 EP 91920060 A EP91920060 A EP 91920060A EP 91920060 A EP91920060 A EP 91920060A EP 0551435 B1 EP0551435 B1 EP 0551435B1
Authority
EP
European Patent Office
Prior art keywords
shroud
centrifugal pump
impeller
shrouds
stator coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91920060A
Other languages
English (en)
French (fr)
Other versions
EP0551435A1 (de
Inventor
Paul Box 304 R.R. 2 Cooper
Lee J. Bulson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ingersoll Dresser Pump Co
Original Assignee
Ingersoll Dresser Pump Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ingersoll Dresser Pump Co filed Critical Ingersoll Dresser Pump Co
Publication of EP0551435A1 publication Critical patent/EP0551435A1/de
Application granted granted Critical
Publication of EP0551435B1 publication Critical patent/EP0551435B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/048—Bearings magnetic; electromagnetic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/186—Shaftless rotors

Definitions

  • This invention relates generally to electrically driven fluid pumps, and more particularly to electrically driven centrifugal pumps which require no shaft seals.
  • Centrifugal fluid pumps are well known in the hydraulic and pneumatic fields. They commonly consist of a motor to drive a shaft on which a fluid impeller is mounted. Generally, the fluid inlet port, or suction port, feeds fluid to the center, or hub, of the impeller. A number of impeller vanes generally project outward from the hub in spiral paths and are supported between shrouds which, together with the vanes, define pumping channels. The rotor is encased in a housing which channels the working fluid from the inlet port to the hub, or inducer, where it is inducted into the pumping channels between the vanes and shrouds. The centrifugal action of the impeller drives the working fluid outward to a diffuser at the periphery of the impeller disk where it enters a scroll shaped volute and, from there, is channelled to the discharge port of the pump.
  • the motor shaft which supports the impeller, requires bearings which are sometimes lubricated by the working fluid, but, in many cases, they require separate lubrication due to incompatibility of the working fluid.
  • seals are required to prevent leakage of the working fluid around the impeller shaft where it enters the pump housing. After some time in service, the bearings may deteriorate to the point where they permit some radial displacement of the rotating shaft. This causes accelerated wear and deterioration of the shaft seal and results in leakage of the working fluid from the pump housing.
  • a balancing device for centrifugal pumps which comprises two balancing chambers formed on either side of the cheeks of an impeller and interconnected by a duct. If e.g. as a result of inequalities in the plays existing on either side of the impeller, different pressures become established in the balancing chambers. Fluid thus flows through the duct to restore the equilibrium of the pressures.
  • US-A-2,700,343 discloses a motor pump unit which is a centrifugal pump which has a housing having separate pumping chambers with separate fluid intakes and discharge ports. There is an impeller mounted for rotation in each chamber, each impeller having a hub section with at least one disc shaped shroud containing rotor coils to form an impeller-rotor unit. A plurality of pumping channels defined by a plurality of impeller blades of the impeller project outwardly from the hub section and are fixed to a face of the shroud. A stator co-operates with the rotor and the stator windings are isolated from the fluid being impelled.
  • a centrifugal pump comprising: a housing having an internal chamber with inlet and discharge ports; an impeller supported in said chamber for rotation about an axis, the impeller having a hub section; at least one disc shaped shroud containing permanent magnets; a plurality of pumping channels defined by a plurality of impeller blades projecting outwardly from the hub section and fixed to a face of the shroud; and means for supplying fluid to the pumping channels, said means comprising at least one opening between the hub section and the shroud; characterised by one or more inducers in said opening, said inducers comprising pumping members which are separate from the impeller blades; and there being a recirculation passage adjacent the or each inducer.
  • Fig. 1 is a schematic cross sectional view of one embodiment of the pump of the present invention, which is seen to be laterally symmetrical about the vertical center plane represented by the centerline of Fig. 1.
  • the housing 10 has an inlet port 11 and a discharge port 12 which are connected by means of inducer assembly 18, impeller shrouds 15, rotating vaneless diffuser 24, and volute 13.
  • the pump fluid enters at the inlet port 11; divides and passes into the two sides of the inducer assembly 18; passes between the two impeller shrouds 15 through pumping channels 55 (shown in Fig.
  • axial thrust balance passages 45 These narrow passages provide the gap necessary for rotation of the rotor shrouds 15 between the stators 14 and, by admission of the feedback fluid, provide a hydrodynamic balance to counteract any axial thrusts of the rotor 15 so that it remains centered between stators 14.
  • Axial thrust balancing rings 16 are provided in the balance passage 45 either on the surface of the stator can 17 or on a projection of housing 10. By narrowing the axial gap between the impeller shrouds 15 and stator cans 17 or housing 10, these rings cause an increase of fluid pressure in the balance passage 45 which enhances the axial thrust balance performance.
  • axial thrust balancing rings 16 The alternative provided for placement of the axial thrust balancing rings 16 is required because, in some cases, stators 14 will not be canned or encapsulated. In such cases, it is necessary to place the axial thrust balancing rings 16 on projections of housing 10.
  • Each half of housing 10 has a toroidal recess 33 in which a stator 14 is secured.
  • recirculation passages 20 are provided to assure smooth inducer action at off-design flow rates.
  • the rotor assembly which includes inducer assembly 18, shrouds 15, impeller blades 21, and rotating diffuser 24 is supported on journals provided on the outside of the tubular axial extensions of shrouds 15 in radial magnetic bearings 35 and auxiliary bearings 40.
  • the rotor is supported by the radial magnetic bearings 35 which have a large enough clearance to provide non-contact bearing support to the rotor.
  • auxiliary bearings 40 are provided for the ensuing emergency rundown of the rotor only, and they have a smaller clearance than do magnetic bearings 35.
  • Impeller shrouds 15 each contain a peripheral array of permanent magnets required for a rotor in a brushless DC motor when used in conjunction with stators 14 containing the windings and electrical connections required for operation as a motor. Because impeller shrouds 15 contain permanent magnets, and because shrouds 15 are supported in radial magnetic bearings 35 and auxiliary bearings 40, there is no need for any shaft to penetrate the housing 10 and, thus, no need for rotary shaft seals which can cause wear of the shaft and will eventually leak.
  • Fig. 2 illustrates another embodiment of the pump of the present invention.
  • the housing 10 is composed of several sections, and it has two inlets 11. Otherwise, in all other respects, the pumps are functionally identical. For this reason, numbering of the various components has been retained consistent with that used in Fig. 1.
  • Fig. 3 shows a fragmentary schematic sectional view of the rotor and housing along line 3-3 of Fig. 1. Vanes 21 are attached to shroud 15. Inducer assembly 18 feeds fluid to the impeller blades which pump it radially outward through pumping channels 55 defined by blades 21 and shrouds 15. Diffuser 24 is defined by that space between the two shrouds 15 radially outside that which is occupied by blades 21. Pressurized fluid from diffuser 24 is carried away through volute 13.
  • the particular design parameters for a given pumping application are determined by pressure and volume requirements, space constraints, working fluid properties, and desired orientation of inlet and discharge ports. These are the considerations that determine the diameter of the impeller shrouds 15, the spacing between the shrouds and consequently the width of the impeller blades 21, the size of diffuser 24 if needed, the size of inducer assembly 18, and the size and shape of the pump housing 10 and recirculation passages 20 which are provided to assure smooth inducer action at off-design flow rates.
  • Stators 14 and impeller shrouds 15 are matched according to pumping power requirements. Stators 14 may or may not be encapsulated in cans 17, depending upon whether the working fluid is compatible with the stators.
  • This invention provides an integrated centrifugal pump and motor having the advantages of compactness, the ability to operate electronically at variable speeds, a shaftless rotor which requires no seals, non-contact radial bearing supports during operation, and hydrodynamic axial thrust balance for the rotor. These advantages are obtained when pumping either compressible or incompressible fluids.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Centrifugal Separators (AREA)

Claims (11)

  1. Zentrifugalpumpe mit einem Gehäuse (10), das eine innere Kammer mit Einlaß- (11) und Auslaßöffnung (12) aufweist, mit einem Laufrad, das in der Kammer zur Rotation um eine Achse gelagert ist, wobei das Laufrad einen Nabenbereich hat; mit wenigstens einer scheibenförmigen Abschirmung (15), die Permanentmagnete enthält; mit einer Mehrzahl von Pumpenkanälen (55), die von einer Mehrzahl von Laufradschaufeln, die vom Nabenbereich nach außen ragen und auf einer Fläche der Abschirmung befestigt sind, definiert werden; und mit Einrichtungen zum Liefern von Fluid zu den Pumpenkanälen, wobei die Einrichtungen wenigstens eine Öffnung zwischen dem Nabenbereich und der Abschirmung aufweisen, gekennzeichnet durch einen oder mehrere, in der Öffnung angeordnete Einlaufkränze (18), wobei die Einlaufkränze Pumpenelemente aufweisen, die von den Laufradschaufeln getrennt sind, und wobei bei dem oder jedem Einlaufkranz ein Rezirkulationsdurchgang angeordnet ist.
  2. Zentrifugalpumpe nach Anspruch 1, wobei das Laufrad eine zweite scheibenförmige Abschirmung (15) aufweist, wobei die Laufradschaufeln (21) zwischen der ersten und der zweiten Abschirmung angeordnet sind.
  3. Zentrifugalpumpe nach Anspruch 2, wobei die zweite scheibenförmige Abschirmung (15) eine Mehrzahl von Permanentmagneten aufweist und wobei eine Statorwicklung (14) neben der zweiten Abschirmung angeordnet ist.
  4. Zentrifugalpumpe nach Anspruch 3, wobei die erste und zweite scheibenförmige Abschirmung (15) von dem Nabenbereich getragen werden, und wobei die Laufradschaufeln (21) in einer gemeinsamen Ebene zwischen der ersten und der zweiten Abschirmung so liegen, daß sie in einer gemeinsamen Ebene normal zur Achse rotieren, wobei die Statorwicklung so neben den Abschirmungen (15) angeordnet ist, daß sie einen Spalt zwischen der Statorwicklung und der Abschirmung bildet, um eine geringe Menge von gepumptem Arbeitsfluid aufzunehmen, und mit einer Einrichtung zum axialen hydrodynamischen Ausgleichen des Laufrades, wobei die Einrichtungen einen Ring (16) aufweisen, der in dem Spalt zum Beschränken des Stroms der kleinen Menge gepumpten Arbeitsfluids angeordnet ist.
  5. Zentrifugalpumpe nach Anspruch 3 oder 4, wobei die zweite Abschirmung eine zweite Zentralöffnung aufweist, die koaxial mit der Zentralöffnung in der ersten Abschirmung liegt, und wobei die Statorwicklung eine weitere darin angeordnete Zentralöffnung aufweist, und mit einer zweiten Strömungsleiteinrichtung zum Steuern der Fluidströmung von der Einlaßöffnung zu den Pumpenkanälen (55) durch die Öffnungen in der zweiten Abschirmung und der Statorwicklung.
  6. Zentrifugalpumpe nach Anspruch 5, wobei die erste und zweite Strömungsleiteinrichtung Einlaufkränze (18) zum Einführen der Strömung in eine Richtung durch die Zentralöffnung in der ersten Abschirmung und in entgegengesetzte Richtung durch die Zentralöffnung in der zweiten Abschirmung aufweist.
  7. Zentrifugalpumpe nach Anspruch 6, wobei das Gehäuse eine erste und eine zweite Einlaßöffnung hat, und wobei die erste und die zweite Strömungsleiteinrichtung Mittel zum Führen des Fluidstromes von der ersten und der zweiten Einlaßöffnung durch die Zentralöffnungen in der ersten und zweiten Abschirmung aufweisen.
  8. Zentrifugalpumpe nach Anspruch 5, 6 oder 7, wobei die zweite Strömungsleiteinrichtung einen Spiraldiffusor (13) aufweist, wobei wenigstens ein Abschnitt davon innerhalb der inneren Kammer angeordnet ist.
  9. Zentrifugalpumpe nach Anspruch 8, wobei die Einlaß- und Auslaßöffnung, der Spiraldiffusor und die Pumpenkanäle in einer gemeinsamen Ebene angeordnet sind.
  10. Zentrifugalpumpe nach einem der Ansprüche 5 bis 9, die eine zweite Statorwicklung (14) aufweist, wobei die erste und zweite Strömungsleiteinrichtung erste und zweite Strömungskanäle aufweisen, die zwischen dem Gehäuse und den Statorwicklungen angeordnet sind.
  11. Zentrifugalpumpe nach einem der Ansprüche 3 bis 10, wobei die oder jede Statorwicklung gekapselt ist, um einen Kontakt mit dem Fluid zu verhindern.
EP91920060A 1990-10-04 1991-09-27 Kreiselpumpe mit integriertem motor Expired - Lifetime EP0551435B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US59365590A 1990-10-04 1990-10-04
US593655 1990-10-04
PCT/US1991/007122 WO1992006301A1 (en) 1990-10-04 1991-09-27 Integrated centrifugal pump and motor

Publications (2)

Publication Number Publication Date
EP0551435A1 EP0551435A1 (de) 1993-07-21
EP0551435B1 true EP0551435B1 (de) 1994-11-17

Family

ID=24375592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920060A Expired - Lifetime EP0551435B1 (de) 1990-10-04 1991-09-27 Kreiselpumpe mit integriertem motor

Country Status (9)

Country Link
EP (1) EP0551435B1 (de)
JP (1) JP2546943B2 (de)
KR (1) KR0171871B1 (de)
CN (1) CN1022504C (de)
AU (1) AU651399B2 (de)
CA (1) CA2092438C (de)
DE (1) DE69105211T2 (de)
WO (1) WO1992006301A1 (de)
ZA (1) ZA917488B (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5769069A (en) * 1995-06-07 1998-06-23 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Natural Resources Low flow-rate pump
DE19846737A1 (de) * 1998-10-12 2000-04-20 Voit Stefan Elektrisch betreibbares Pumpelement zum Einsatz in einem Kühlsystem sowie Wärmetauscher eines Kühlsystems
US6234772B1 (en) * 1999-04-28 2001-05-22 Kriton Medical, Inc. Rotary blood pump
CN101255868B (zh) * 2007-12-10 2010-11-24 兰州理工大学 电机内嵌叶片泵
RU2472277C1 (ru) * 2011-08-10 2013-01-10 Павел Николаевич Манташьян Магнитный насос
US8905729B2 (en) * 2011-12-30 2014-12-09 Peopleflo Manufacturing, Inc. Rotodynamic pump with electro-magnet coupling inside the impeller
CN112682315A (zh) * 2020-12-17 2021-04-20 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） 一种双向轴流泵
CN112879313B (zh) * 2021-01-22 2022-07-01 东北石油大学 一种机泵一体化的潜油离心泵

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US1586978A (en) * 1921-02-03 1926-06-01 Worthington Pump & Mach Corp Centrifugal pump
FR591315A (fr) * 1924-03-06 1925-07-02 Rateau Sa Dispositif d'équilibrage des pompes et ventilateurs centrifuges et machines analogues
GB582036A (en) * 1944-07-07 1946-11-01 Maldwyn Lewis Thomas Improved combined pump and electric motor unit
US2700343A (en) 1950-05-11 1955-01-25 Jr Albert R Pezzillo Motor pump unit
US3347168A (en) * 1966-02-16 1967-10-17 Westinghouse Electric Corp Motor pump unit
WO1982003176A1 (en) * 1981-03-18 1982-09-30 Bramm Guenter Walter Otto Megnetically suspended and rotated impellor pump apparatus and method
JPS6284694U (de) * 1985-11-14 1987-05-29
JPH0433435Y2 (de) * 1986-05-23 1992-08-11
JPH0776560B2 (ja) * 1987-09-14 1995-08-16 テルモ株式会社 血液移送用ポンプ
US4876492A (en) * 1988-02-26 1989-10-24 General Electric Company Electronically commutated motor driven apparatus including an impeller in a housing driven by a stator on the housing
JPH0786356B2 (ja) * 1988-04-22 1995-09-20 日機装株式会社 吸収式冷凍機用キャンドモータポンプ
JP2729637B2 (ja) * 1988-10-04 1998-03-18 京セラ株式会社 スクリュー遠心ポンプ
JPH07117060B2 (ja) * 1989-03-22 1995-12-18 芳雄 矢野 流体移送装置

Also Published As

Publication number Publication date
AU8907591A (en) 1992-04-28
KR0171871B1 (ko) 1999-03-20
AU651399B2 (en) 1994-07-21
CA2092438A1 (en) 1992-04-05
EP0551435A1 (de) 1993-07-21
CN1061836A (zh) 1992-06-10
DE69105211T2 (de) 1995-06-01
JPH06502470A (ja) 1994-03-17
KR930702619A (ko) 1993-09-09
ZA917488B (en) 1993-03-31
CN1022504C (zh) 1993-10-20
CA2092438C (en) 2002-05-07
WO1992006301A1 (en) 1992-04-16
JP2546943B2 (ja) 1996-10-23
DE69105211D1 (de) 1994-12-22

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