EP0501109A1 - Centrifugal pump driven by a synchronous motor - Google Patents

Centrifugal pump driven by a synchronous motor Download PDF

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Publication number
EP0501109A1
EP0501109A1 EP92100304A EP92100304A EP0501109A1 EP 0501109 A1 EP0501109 A1 EP 0501109A1 EP 92100304 A EP92100304 A EP 92100304A EP 92100304 A EP92100304 A EP 92100304A EP 0501109 A1 EP0501109 A1 EP 0501109A1
Authority
EP
European Patent Office
Prior art keywords
centrifugal pump
baffle means
pressure chamber
outlet
impeller
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.)
Withdrawn
Application number
EP92100304A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ugo Favret
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.)
Electrolux Zanussi Elettrodomestici SpA
Original Assignee
Zanussi Elettrodomestici SpA
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 Zanussi Elettrodomestici SpA filed Critical Zanussi Elettrodomestici SpA
Publication of EP0501109A1 publication Critical patent/EP0501109A1/en
Withdrawn legal-status Critical Current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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/48—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps
    • F04D29/486—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps especially adapted for liquid pumps
    • 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

Definitions

  • the present invention relates to a centrifugal pump driven by a synchronous motor which - as is known - may indifferently be started in either of two opposite directions of rotation.
  • centrifugal pumps driven by a synchronous motor are arranged substantially as described in EP-A-0 207 430. More particularly, these pumps comprise a pressure chamber, having a substantially circular cross-section, from which a delivery pipe branches off radially; furthermore, an impeller having radial blades is provided in the pressure chamber.
  • Such a symmetrical structure is necessary in a centrifugal pump driven by a synchronous motor, unless special uni-directional starting devices are undesirably provided, in order to obtain equal hydraulic performances in both directions of rotation of the impeller.
  • the performance of the pump is however reduced, mainly because of the incorrect alignment of the delivery pipe with respect to the virtual direction of the fluid outflow, which is substantially tangential to the inner periphery of the pressure chamber. As a consequence, a portion of the pressurized fluid in the pump chamber tends to be re-circulated within the chamber, instead of being delivered through the radial delivery pipe.
  • the centrifugal pump basically comprises a pressure chamber 3 having a substantially circular cross-section and tapered towards a peripheral outlet 4 from which a delivery pipe 5 branches off substantially radially.
  • the pressure chamber 3 is provided with a central suction inlet 6 which is substantially concentric with respect to the drive shaft 7 of an impeller 8.
  • the impeller 8 is formed with substantially rectilinear radial blades 9 and the shaft 7 is rotatably driven by a synchronous electric motor 10.
  • a baffle 11 is provided in the pressure chamber 3, adjacent to the outlet 4.
  • the baffle 11 has a regular flat configuration, its width being just narrower than the inner axial length of chamber 3, and in correspondence of its innermost end portion 12 is freely hinged on the side walls of the chamber along an axis which is substantially parallel to the drive shaft 7.
  • the end portion 12 of the baffle 11 is disposed in the chamber 3 at a radial distance from the axis of the drive shaft 7 which is just longer than the radius of the impeller 8.
  • the free end portion 13 of baffle 11 is capable of abutting against the edge of outlet 4, such that the baffle may freely pivot about its hinge axis between two angularly opposite operative positions.
  • the edge of outlet 4 is preferably shaped accordingly, that is, with at least two diametrically opposite rectilinear portions 14, 15 ( Figure 2) against which the baffle 11 can stop; for instance, the outlet 4 and at least a portion of the delivery pipe 5 have a substantially square cross-section.
  • the negligible gap provided between the baffle 11 and the periphery of the impeller 8 prevents possible solid foreign bodies from getting stuck between the said two elements, where they could block the impeller 8.
  • the two operative positions of the baffle 11 may be defined by respective projections (not shown), instead of the edge of the outlet 4, which are preferably formed integrally with the pressure chamber 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP92100304A 1991-02-27 1992-01-10 Centrifugal pump driven by a synchronous motor Withdrawn EP0501109A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT91PN000006U IT225637Y1 (it) 1991-02-27 1991-02-27 Pompa centrifuga a motore sincrono
ITPN910006U 1991-02-27

Publications (1)

Publication Number Publication Date
EP0501109A1 true EP0501109A1 (en) 1992-09-02

Family

ID=11394488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92100304A Withdrawn EP0501109A1 (en) 1991-02-27 1992-01-10 Centrifugal pump driven by a synchronous motor

Country Status (2)

Country Link
EP (1) EP0501109A1 (it)
IT (1) IT225637Y1 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664397A1 (de) * 1994-01-24 1995-07-26 JUWEL AQUARIUM GmbH & Co. KG Impellerpumpe
GB2353330A (en) * 1999-08-04 2001-02-21 Pet Mate Ltd Pond pump driven by synchronous motor
EP3156662A1 (de) * 2015-10-12 2017-04-19 Grundfos Holding A/S Pumpenaggregat und hydraulisches system
CN110439863A (zh) * 2019-07-10 2019-11-12 无锡小天鹅电器有限公司 排水泵的泵壳、排水泵及衣物处理设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1049066A (fr) * 1952-01-12 1953-12-28 Pompe centrifuge
DE3442907A1 (de) * 1984-11-24 1986-06-05 Robert Bosch Gmbh, 7000 Stuttgart Foerderaggregat mit einem in beiden drehrichtungen betreibbaren, als synchronmotor ausgebildeten elektrischen antriebsmotor
DE3830542A1 (de) * 1988-09-08 1990-03-15 Licentia Gmbh Kreiselpumpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1049066A (fr) * 1952-01-12 1953-12-28 Pompe centrifuge
DE3442907A1 (de) * 1984-11-24 1986-06-05 Robert Bosch Gmbh, 7000 Stuttgart Foerderaggregat mit einem in beiden drehrichtungen betreibbaren, als synchronmotor ausgebildeten elektrischen antriebsmotor
DE3830542A1 (de) * 1988-09-08 1990-03-15 Licentia Gmbh Kreiselpumpe

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664397A1 (de) * 1994-01-24 1995-07-26 JUWEL AQUARIUM GmbH & Co. KG Impellerpumpe
GB2353330A (en) * 1999-08-04 2001-02-21 Pet Mate Ltd Pond pump driven by synchronous motor
US6524078B1 (en) 1999-08-04 2003-02-25 Pet Mate Ltd. Pond pump with reversing means to prevent rotation in the opposite direction
GB2353330B (en) * 1999-08-04 2003-05-28 Pet Mate Ltd Pond pump
EP3156662A1 (de) * 2015-10-12 2017-04-19 Grundfos Holding A/S Pumpenaggregat und hydraulisches system
WO2017063969A1 (de) * 2015-10-12 2017-04-20 Grundfos Holding A/S Pumpenaggregat und hydraulisches system
CN108138800A (zh) * 2015-10-12 2018-06-08 格兰富控股联合股份公司 泵机组和液压系统
CN110439863A (zh) * 2019-07-10 2019-11-12 无锡小天鹅电器有限公司 排水泵的泵壳、排水泵及衣物处理设备

Also Published As

Publication number Publication date
ITPN910006U1 (it) 1992-08-27
ITPN910006V0 (it) 1991-02-27
IT225637Y1 (it) 1997-01-13

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