EP0055426A1 - Stage compartment structure for multistage pumps - Google Patents

Stage compartment structure for multistage pumps Download PDF

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Publication number
EP0055426A1
EP0055426A1 EP81110541A EP81110541A EP0055426A1 EP 0055426 A1 EP0055426 A1 EP 0055426A1 EP 81110541 A EP81110541 A EP 81110541A EP 81110541 A EP81110541 A EP 81110541A EP 0055426 A1 EP0055426 A1 EP 0055426A1
Authority
EP
European Patent Office
Prior art keywords
case member
end portion
opposite
compartment structure
stage compartment
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Withdrawn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
EP81110541A
Other languages
German (de)
English (en)
French (fr)
Inventor
Primo Lovisetto
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.)
Lowara SRL
Original Assignee
Lowara SRL
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 Lowara SRL filed Critical Lowara SRL
Publication of EP0055426A1 publication Critical patent/EP0055426A1/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Withdrawn legal-status Critical Current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
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • F04D1/066—Multi-stage pumps of the vertically split casing type the casing consisting of a plurality of annuli bolted together

Definitions

  • This invention relates to a stage compartment structure for multistage pumps.
  • the task of this invention is to provide a stage case for multistage pumps which can afford a .reliable seal between stages, and is simple to manufacture and assemble.
  • a stage compartment structure for multistage pumps characterized in that it comprises a sleeve-like case member surrounding in use the drive shaft of the pump and having one circumferentially recessed end portion, an opposite circumferentially enlarged end portion and an intermediate portion connecting that one and said opposite end portions, a circumferential shoulder materializing the the connection between said intermediate sleeve portion and said opposite end portion, a partition plate member extending in use perpendicular to said drive shaft and having its peripheral edge portion in engagement with said shoulder, in use said opposite circumferentially enlarged portion of a preceding case member overlapping said one circumferentially recessed portion of a succeeding case member, sealing means being provided between the overlapping portions.
  • the numeral 1 designates the hydraulic portion of a multistage pump which comprises a plurality of stages 2, wherein corresponding centrifugal impellers 3 rotate, which are made rigid with one another through connection on a common axle or driving shaft 4, connected through a coupling 5 to a driving motor 6.
  • Said stages 2 are included between a suction or intake head 7 and a delivery head 8 and held rigidly together by plural studs 9 with locking nuts 10 acting between the two heads 7 and 8.
  • Each stage 2 comprises substantially a cylindrical bell member formed laterally by a cylindrical container or case 11, with its generatrix arranged to generally extend parallel to the axis of the motor 4, and by a partition member 12 of annular shape, arranged to extend on a plane normal to said motor axis.
  • the case or container 11 which is preferably formed from pressed sheet metal, has at one end a recessed region 13, with a recess depth dimension selected to form an annular seat for a seal ring 14.
  • said case 11 is closed by said partition member 12, and the recessed region is provided at the edge with a ring-like tooth 15-, extending in a plane normal to said motor axis 4 adapted to abut against the partition member 12.
  • the inside circumference of said partition member 12 is in turn provided with a bent tooth 16 constituting a rotation seat for. the mouth 17 of the centrifugal impeller 3.
  • the case 11 is provided with an outwardly offset or raised region 18, the offsetting dimension whereof is selected to be equal to the thickness of the sheet metal forming the case.
  • the raised region 18 extends from a curved portion 19 constituting an abutment or shoulder for the outer circumference of the partition member 12.
  • stages 2 are provided, in a manner known per se, with baffles 20.
  • a preset number of cases 11, including their related partition members 12, are stacked together while inserting the impellers 3 as well.
  • the cases, under the force exerted on the studs 9, provide a monolithic type of structure, wherein the hydraulic seal is achieved both mechanically through the tooth 15 and curved portion 19 abutting against the opposed faces of the partition member 12, and the raised region 18 engaging with the adjacent case, as well as elastically by means of the seal ring 14.
  • the construction is considerably simple, it only entailing the drawing of sheet metal and the optional grinding of the abutment surfaces.
  • the materials, shapes, and dimensions may be any ones suitable for the intended applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP81110541A 1980-12-29 1981-12-17 Stage compartment structure for multistage pumps Withdrawn EP0055426A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3090280U 1980-12-29
ITPD1980U30902U IT8030902U1 (it) 1980-12-29 1980-12-29 Contenitore per stadio di pompa multistadio

Publications (1)

Publication Number Publication Date
EP0055426A1 true EP0055426A1 (en) 1982-07-07

Family

ID=11232734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110541A Withdrawn EP0055426A1 (en) 1980-12-29 1981-12-17 Stage compartment structure for multistage pumps

Country Status (3)

Country Link
EP (1) EP0055426A1 (da)
DK (1) DK578081A (da)
IT (1) IT8030902U1 (da)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816280A1 (de) * 1988-05-12 1989-11-23 Klein Schanzlin & Becker Ag Gehaeuseteil fuer kreiselpumpen
EP0492604A3 (en) * 1990-12-25 1993-03-03 Ebara Corporation Interstage casing for a pump made of sheet metal
US5234317A (en) * 1990-12-25 1993-08-10 Ebara Corporation Sheet metal interstage casing for a pump
US5318403A (en) * 1990-12-25 1994-06-07 Ebara Corporation Interstage casing for a pump made of sheet metal and method of manufacturing the same
DE4310466A1 (de) * 1993-03-31 1994-10-06 Klein Schanzlin & Becker Ag Pumpenstufe in Blechbauweise
FR2776342A1 (fr) * 1998-03-18 1999-09-24 Sarl Cg Promo Star Pompe centrifuge a amorcage automatique
DE10126488A1 (de) * 2001-05-31 2002-12-05 Ksb Ag Stufengehäuse in mehrteiliger Blechbauweise
WO2003062645A1 (en) 2002-01-21 2003-07-31 Ebara Corporation Multistage pump
WO2003062646A1 (en) * 2002-01-21 2003-07-31 Ebara Corporation Impeller

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1366589A (en) * 1920-01-23 1921-01-25 Ostenberg Pontus Centrifugal pump
DE353978C (de) * 1922-05-31 Vitus Stanzel Mehrstufige Kreiselpumpe mit besonderem runden Gehaeuseteil fuer jedes Laufrad
CH303394A (de) * 1951-10-20 1954-11-30 Wenger Hermann Mehrstufiger Kreiselverdichter.
FR2349753A1 (fr) * 1976-04-29 1977-11-25 Klein Schanzlin & Becker Ag Support de la partie tournante d'une pompe centrifuge multicellulaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE353978C (de) * 1922-05-31 Vitus Stanzel Mehrstufige Kreiselpumpe mit besonderem runden Gehaeuseteil fuer jedes Laufrad
US1366589A (en) * 1920-01-23 1921-01-25 Ostenberg Pontus Centrifugal pump
CH303394A (de) * 1951-10-20 1954-11-30 Wenger Hermann Mehrstufiger Kreiselverdichter.
FR2349753A1 (fr) * 1976-04-29 1977-11-25 Klein Schanzlin & Becker Ag Support de la partie tournante d'une pompe centrifuge multicellulaire

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816280A1 (de) * 1988-05-12 1989-11-23 Klein Schanzlin & Becker Ag Gehaeuseteil fuer kreiselpumpen
US5256033A (en) * 1990-11-25 1993-10-26 Ebara Corporation Sheet metal interstage casing for a pump
US5369972A (en) * 1990-12-25 1994-12-06 Ebara Corporation Interstage casing for a pump made of sheet metal and method of manufacturing the same
US5234317A (en) * 1990-12-25 1993-08-10 Ebara Corporation Sheet metal interstage casing for a pump
US5318403A (en) * 1990-12-25 1994-06-07 Ebara Corporation Interstage casing for a pump made of sheet metal and method of manufacturing the same
EP0492604A3 (en) * 1990-12-25 1993-03-03 Ebara Corporation Interstage casing for a pump made of sheet metal
DE4310466A1 (de) * 1993-03-31 1994-10-06 Klein Schanzlin & Becker Ag Pumpenstufe in Blechbauweise
FR2776342A1 (fr) * 1998-03-18 1999-09-24 Sarl Cg Promo Star Pompe centrifuge a amorcage automatique
DE10126488A1 (de) * 2001-05-31 2002-12-05 Ksb Ag Stufengehäuse in mehrteiliger Blechbauweise
WO2003062645A1 (en) 2002-01-21 2003-07-31 Ebara Corporation Multistage pump
WO2003062646A1 (en) * 2002-01-21 2003-07-31 Ebara Corporation Impeller
US7247001B2 (en) 2002-01-21 2007-07-24 Ebara Corporation Impeller
CN100395455C (zh) * 2002-01-21 2008-06-18 株式会社荏原制作所 叶轮及具有该叶轮的多级泵
EP1469202A4 (en) * 2002-01-21 2009-06-24 Ebara Corp MULTI-STAGE PUMP
US7648337B2 (en) * 2002-01-21 2010-01-19 Ebara Corporation Multistage pump

Also Published As

Publication number Publication date
IT8030902U1 (it) 1982-06-29
IT8030902V0 (it) 1980-12-29
DK578081A (da) 1982-06-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL SE

17P Request for examination filed

Effective date: 19830105

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840620

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LOVISETTO, PRIMO