US3612716A - Multistage centrifugal pump - Google Patents

Multistage centrifugal pump Download PDF

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Publication number
US3612716A
US3612716A US46268A US3612716DA US3612716A US 3612716 A US3612716 A US 3612716A US 46268 A US46268 A US 46268A US 3612716D A US3612716D A US 3612716DA US 3612716 A US3612716 A US 3612716A
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US
United States
Prior art keywords
impeller
diffuser
wall
pump
drive shaft
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
US46268A
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English (en)
Inventor
Elmer M Deters
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.)
Marley Wylain Co LLC
Red Jacket Manufacturing Co
Original Assignee
Red Jacket Manufacturing 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
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Application granted granted Critical
Publication of US3612716A publication Critical patent/US3612716A/en
Assigned to MARLEY-WYLAIN COMPANY THE reassignment MARLEY-WYLAIN COMPANY THE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: WYLAIN, INC.
Assigned to MARLEY-WYLAIN COMPANY THE reassignment MARLEY-WYLAIN COMPANY THE EFFECTIVE JULY 10, 1981. CERTIFICATE OF CORRECTION FROM THE SECRETARY OF STATE OF DELAWARE TO CORRECT THE THIRD PARAGRAPH OF CERTIFICATE OF MERGER. Assignors: MARLEY-WYLAIN COMPANY THE (INTO), NEW MWY, INC. (CHANGED TO)
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
    • 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
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/901—Drilled well-type pump

Definitions

  • FIGS. 1-4 show a centrifugal pump with floating stages.
  • Each stage has a rubber journal and a stainless steel bushing which provide a radial bearing as well as a seal between the impeller chamber and difiuser passages.
  • the other embodiments show other forms of the bearing and journal members applied to a stacked (nonfloating) impeller type of centrifugal pump. in
  • one of the members is tapered to allow the motor to operate more easily in liquids containing abrasives.
  • the invention pertains generally to the field of pumps and more particularly to a centrifugal pump having multiple stages and diffusers.
  • Some wells tend to continually supply sand or other abrasives with the water. The same condition exists, for a period of time, in newly drilled wells that have not been properly cleaned. Increased wear, caused by such abrasives, can greatly reduce the efliciency of a centrifugal pump. In addition, increased clearances may allow the shaft to whip during operation and this increases the rate of wear. When there are heavy abrasives in the liquid, there is a tendency for the pump to lockup and prevent the motor from starting, or even stall the motor. This occurs when the abrasives lodge in the seal between the hub and the diffuser.
  • the present invention relates to new and improved construction for centrifugal pumps having multiple stages and diffusers.
  • Another object is to provide a centrifugal pump which is constructed and arranged to provide reduced wear.
  • Still another object is to provide a multistage centrifugal pump with an improved radial bearing arrangement at each stage.
  • Yet another object of the present invention is to provide a centrifugal pump constructed to reduce the tendency for the pump to lockup when handling liquids containing abrasives.
  • FIG. I is a vertical sectional view through a centrifugal pump unit of one embodiment of the present invention.
  • FIG. 2 is an enlarged fragmentary sectional view of the embodiment of FIG. I;
  • FIG. 3 is a cross-sectional view taken generally along broken line 3-3 of FIG. 2 and on a smaller scale;
  • FIG. 4 is a sectional view through the rubber bushing utilized in the embodiment of FIGS. 1-3;
  • FIG. 5 is a fragmentary sectional view similar to FIG. 2 but of a second embodiment of the invention;
  • FIG. 6 is a partial cross-sectional view taken along line 6--6 of FIG. 5;
  • FIGS. 7 and 8 are fragmentary sectional views similar to FIG. 2 but of other embodiments of the invention.
  • DESCRIPTION lers 28 arranged in the respective casings.
  • DESCRIPTION lers 28 arranged in the respective casings.
  • the impellers 28 are arranged to float relatively freely on the drive shaft 22 within preselected limits.
  • the impellers 28 have hubs 38 slidably and nonrotatably mounted on the drive shaft 22.
  • the hubs 38 are internally splined to fit on the splined drive shaft 22.
  • a rear wall 40 extends radially from hub 38 and a front wall 42 is spaced axially from the rear wall 40 as best shown in FIG. 2.
  • the outer periphery of the rear wall is advantageously spaced radially inwardly from the periphery of the front wall to direct fluid upwardly to a succeeding pump stage.
  • Impeller vanes 44 separate the front and rear walls and define a plurality of im peller passages for transferring fluid from the inlet of the impeller to the outer periphery thereof when the impellers are rotated.
  • Vanes 44 are conveniently formed integral with rear wall 40 on the front side thereof, and a plurality of openings 48 are located in these vanes. Pins 46, extending from the rear side of front wall 42, extend into openings 48 for assembly of the completed impeller.
  • the impellers may be economically fabricated from a suitable plastic such as Delrin.
  • Front wall 42 is provided with a central impeller inlet 49 which leads to the impeller passageways defined by the walls 40 and 42 and the vanes 44.
  • Each impeller 28 is contained in the casing 26.
  • Each casing includes an outer peripheral wall 52, a diffuser wall 56, and an inlet or thrust wall 54. Walls 52, 54 and 56 define an impeller chamber 58 for transferring fluid from the periphery of one impeller to the inlet of the adjacent impeller of the next succeeding pump stage.
  • diffuser wall 56 is provided with ramps 60 which extend upwardly from a lower edge 61 to an upper edge 62 (see FIG. 3).
  • Difiuser vanes 64 spiral inwardly on the rear side of diffuser wall 56 and terminate at an innner end 65.
  • each of the aforedescribed impellers 28 and casings 26 for v the several stages of the pump are generally identical in construction and like numerals are utilized to designate corresponding parts of the several stage.
  • the casings 26, each containing an impeller 28, are advantageously stacked one on top of the other and held together by outer sleeve 24 which surrounds the casings.
  • Outer sleeve 24 is secured to an upper discharge member 66 and a lower motor mount 68.
  • Motor mount 68 contains a main pump inlet 70 and the impellers, all facing in the same direction, will transfer the fluid from the main pump inlet 70 to a main pump outlet 72 in the upper discharge member 66.
  • Upper discharge member 66 also contains a valve member 74 of any convenient construction.
  • the liquid is transferred though the successive impeller chambers as described above.
  • the pressure of the fluid is increased in step fashion in the successive pump stages and the difference between the fluid pressures in each impeller chamber 58 and at the inlet of the respective impellers produces an axial hydraulic thrust on the impellers in a direction toward the pump inlet under certain operating conditions.
  • Each thrust wall 54 has a central opening adjacent the impeller inlet.
  • Seal means is provided at the impeller inlet 49 to limit recirculation of fluid from the impeller chambers 58 back to the respective inlet.
  • the seal means includes an annular insert 78 disposed in the thrust wall central opening and a washer 82 mounted at the front side of the impeller front wall 42.
  • Insert 78 is preferably formed of stainless steel and is of L-shaped cross section. Washer 82 may be formed of various different materials which provide good wear characteristics when in rubbing contact with insert 78. The washer 82 cooperates with inlet 78 to provide a seal at the impeller inlet 49 as well as a bearing when the impeller 28 is urged toward the inlet or front side.
  • the hydraulic pressures are continually increased through the successive pump stages.
  • the relative pressures of a middle pump stage may be about 12 p.s.i. at the central inlet 49, about 20 p.s.i. at the outlet of the impeller, and 24 p.s.i. in the diffuser passage 64a.
  • the pressure at the center of the impeller chambers 58 may be about 18 p.s.i.
  • an annular rubber member 90 is mounted on the drive shaft 22 and a stainless steel member 92 is mounted on the diffuser wall 56.
  • rubber member 90 is generally L-shaped in cross section having legs 94 and 96 and is internally splined as at 98 to have a driving connection to the spline drive shaft 22.
  • the rubber member 90 provides a journal and the stainless steel member 92 is a bussing L-shaped in cross section, engaged with the journal.
  • Bushing 92 is preferably formed of stainless steel and has a press fit in the nonrotatable diffuser wall 56.
  • journal 90 is mounted rearwardly of the rear wall 40 of the impeller for rotation with the drive shaft and impeller while the bushing 92 is nonrotatably mounted and in engagement with the journal 90.
  • These two members have a relatively close fit to provide a seal between the impeller chamber 58 and the diffuser passage 64a to reduce backflow of liquid therebetween. Further, these members provide a radial bearing for the drive shaft 22 at each pump stage thereby eliminating the necessity for a bearing in the pump head. Also, since the rubber journal 90 is a separate part, it can be replaced without necessitating the replacement of the whole impeller 28.
  • the member 90 is preferably made of rubber so that it can be deformed, pass any such abrasives, and return to its original seal position without undue wear.
  • Vanes 55 on the thrust plate 54 retard rotation of the fluid at the front side of the impellers 28 to increase the pressure thereat.
  • the impellers are free to axially float in the impeller chambers and move away from the vanes a distance such that the axial hydraulic thrust of the impellers will be balanced. This provides a self-regulating type of hydraulic balance for the impellers. Since the impellers do not exert a large axial thrust on the shaft 22, it is unnecessary to provide a large thrust bearing for the pump drive shaft.
  • the front and rear walls of the impellers are moulded in separate pieces for ease of moulding and are held together by the pressure conditions in the impeller chambers so as to eliminate the necessity of a separate assembly step to rigidly secure the sections together.
  • the rubber journal 90 at the rear side of the impeller 28 permits limited axial floating of the impellers on the drive shaft, cooperates with the stainless steel bushing 92 to provide a seal between the diffuser passages and the impeller chamber, and yet is resilient to pass any abrasives that may be contained in the fluid and which might otherwise tend to lodge in the seal. Rubber member 90 and stainless steel bushing 92 provide a radial bearing at each pump stage thereby eliminating the necessity of a bearing in the pump head.
  • the wall 54 has a larger central opening and a bushing 78', is mounted in that opening.
  • the front wall 42 of the impeller has a skirt 420 at its central opening 49 and in engagement with the bushing 78'.
  • the skirt and the bushing provide a radially seal around the inlet opening.
  • the major differences in construction of this embodiment relate to the impeller hub and the rubber journal.
  • the impeller hub 38 has an extension 38a at the rear side of the rear wall. The extremity of extension 38a engages the front edge of a succeeding hub 38 thereby providing a stacked (nonfloating) impeller.
  • a bearing (not shown) is provided for receiving the axial thrust from the impellers.
  • the hub extension 38a has a plurality of keyways 101 as best shown in FIG. 6.
  • a rubber journal is mounted outwardly of the extension 38a at the rear side of the rear wall 40 of the impeller.
  • the rubber journal 90 is shaped to extend into the keyways 101 and is thus keyed to the hub extension 38a for rotation with the drive shaft 22.
  • the rubber journal 90 cooperates with the stainless steel bushing 92 in the manner described above and for the same purposes.
  • a rubber journal 90" is tapered inwardly away from the stainless steel bushing 92 in the direction from the diffuser wall 56 toward the rear wall 40 of the impeller. This provides a channel which diverges from the higher pressure difiuser passageway 64a toward the lower pressure impeller chamber 58. This allows any abrasives or grit that may be lodged in the seal between the rubber journal 90 and the stainless steel bushing 92 to be more easily passed into the lower pressure impeller chamber 58.
  • the tapered clearance arrangement is provided on the bushing instead of the journal.
  • a journal 102 is fonned of stainless steel and is keyed to the hub extension 38a.
  • the journal 102 could be directly mounted on the shaft 22, if desired.
  • a bushing 103 is advantageously formed of rubber and has legs 104 and 105 extending on opposite sides of the diffuser wall 56. Leg 104 is advantageously shorter than leg 105 for ease in assembly.
  • bushing 103 is tapered away from journal I02 and in the same direction as described above.
  • the tapered clearance arrangement could be provided integrally with a plastic hub or could be provided by a tapered central opening in the diffuser wall 56.
  • Each embodiment provides a centrifugal pump with improved life when utilized for pumping liquids containing abrasives.
  • Each-embodiment provides an improved radial bearing arrangement at each stage of the pump and an improved self-cleaning seal construction between the impeller chamber and the diffuser passages.
  • the embodiments of FIGS. 7 and 8 provide a construction which reduces the tendency for the pump to lockup when handling liquids containing abrasives.
  • a multistage diffuser-type centrifugal pump for pumping liquid from a main pump inlet to a main pump outlet and including: a rotatable drive shaft; a plurality of pump impellers each having a hub engaged with the drive shaft for rotation therewith, a rear wall extending outwardly from the hub, a central opening, a front wall extending outwardly from the central opening, and impeller passages extending between the front and rear walls toward the outer periphery of the impeller; and a nonrotatable pump casing surrounding said impellers and including a plurality of walls each spaced axially forwardly of the front wall of a respective impeller, a plurality of nonrotatable diffuser walls each spaced axially rearwardly of the rear wall of a respective impeller to define a plurality of impeller chambers, and means defining a plurality of diffuser passages for transferring liquid from the periphery of each impeller chamber to the rear side of the respective diffuser wall and to the inlet opening of
  • a multistage, difiuser-type centrifugal pump for pumping liquid from a main pump inlet to a main pump outlet and including:
  • a plurality of pump impellers each having a central inlet opening, a front wall extending outwardly from the central inlet opening, a hub, a rear wall extending outwardly from the hub, impeller passages extending between the front and rear walls from the central inlet opening to the outer periphery of the impeller, means slidably mounting the hub on the drive shaft for rotation therewith but permitting limited axial movement of the impeller relative to the shaft, and the impellers being disposed on the drive shaft with their inlet openings facing in the same direction;
  • a pump casing surrounding the impellers and including a plurality of walls each spaced axially forwardly of the front wall of a respective impeller, a plurality of nonrotatable diffuser walls each spaced axially rearwardly of the rear wall of a respective inlgleller to define a plurality of impeller chambers, each d serwall having a central opening spaced from the drive shaft, means defining a plurality of diffuser passages for transferring liquid from the periphery of each impeller chamber to the rear side of the respective diffuser wall and to the inlet opening of the impeller of a succeeding pump stage;
  • the impellers being dimensioned in relation to the impeller chambers to permit independent axial float within the respective chamber and along the shaft whereby the impellers can shift as the hydraulic thrust changes;
  • journal mounted on the drive shaft for rotation therewith, the journal being located rearwardly of the rear wall of the impeller and disposed in the central opening of the diffuser wall, and the journal being spaced from at least one adjacent hub to allow the axial float of the impeller;
  • a multistage, diffuser-type centrifugal pump for pumping liquid from a main pump inlet to a main pump outlet and including: a rotatable drive shaft; a plurality of pump im pellers each having a hub engaged with the drive shaft for rotation therewith, a rear wall extending outwardly from the hub, a central opening, a front wall extending outwardly from the central opening, and impeller passages extending between the front and rear walls toward the outer periphery of the impeller; and a nonrotatable pump casing surrounding the impellers and including a plurality of walls each spaced axially for wardly of the front wall of a respective impeller, a plurality of nonrotatable diffuser walls each spaced axially rearwardly of the rear wall of a respective impeller to define a plurality of impeller chambers, each diffuser wall having a central opening spaced from the drive shaft, and means defining a plurality of diffuser passages for transferring liquid from the periphery of each
  • Apparatus according to claim 10 wherein the hub extends through the central opening of the diffuser wall and the means being tapered is a tapered surface on the hub.
  • Apparatus according to claim 10 wherein the means being tapered is a tapered surface at the central opening of the diffuser wall, and including a flat land adjacent the tapered surface, the land being in contact with the other means over substantially its entire area.
  • Apparatus according to claim 10 wherein the means being tapered is made of rubber, and the other means is an annular stainless steel member.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US46268A 1970-06-15 1970-06-15 Multistage centrifugal pump Expired - Lifetime US3612716A (en)

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US4626870A 1970-06-15 1970-06-15

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779668A (en) * 1972-05-11 1973-12-18 Mcneil Corp Stage for a centrifugal pump
US4063846A (en) * 1974-11-13 1977-12-20 Borg-Warner Corporation Pump impeller improvement
US4120606A (en) * 1975-10-30 1978-10-17 Klein, Schanzlin & Becker Aktiengesellschaft Submersible motor pump
US4406582A (en) * 1981-05-19 1983-09-27 Marley-Wylain Company Submersible pump discharge head
US4586880A (en) * 1983-04-29 1986-05-06 Mitsubishi Denki Kabushiki Kaisha Submersible motor and pump assembly
US4708589A (en) * 1985-09-19 1987-11-24 The Marley-Wylain Company Roll-formed submersible pump
US4720242A (en) * 1987-03-23 1988-01-19 Lowara, S.P.A. Centrifugal pump impeller
US4802819A (en) * 1987-09-14 1989-02-07 Mcneil (Ohio) Corporation Centrifugal pump
US4838758A (en) * 1987-12-28 1989-06-13 Baker Hughes Incorporated Reduced diameter downthrust pad for a centrifugal pump
US4859144A (en) * 1988-03-07 1989-08-22 The Hoover Company Fan stage configuration
US4923367A (en) * 1988-03-14 1990-05-08 Flint & Walling, Inc. Submersible pump with plastic housing
US5456577A (en) * 1994-07-28 1995-10-10 Ingersoll-Dresser Pump Company Centrifugal pump with resiliently biasing diffuser
US20090191061A1 (en) * 2005-07-19 2009-07-30 Davey Products Pty Ltd Impeller Arrangement and Pump
US20110052402A1 (en) * 2008-01-19 2011-03-03 Laurent Costaquec Fastening of the rotor of a centrifugal pump befestigung de laufrades einer kreisel pumpe
ITTO20100041A1 (it) * 2010-01-22 2011-07-23 Itt Mfg Enterprises Inc Pompa centrifuga
US20110194926A1 (en) * 2010-02-05 2011-08-11 Baker Hughes Incorporated Submersible Pump for Operation In Sandy Environments, Diffuser Assembly, And Related Methods
US20110210857A1 (en) * 2008-09-14 2011-09-01 Sicherungsgerätebau GmbH Sensor unit for checking of monitoring areas of double-walled containers or double-walled pipelines, or double-walled vessels
US20120020777A1 (en) * 2010-06-30 2012-01-26 Schlumberger Technology Corporation Durable pumps for abrasives
CN102444588A (zh) * 2011-11-18 2012-05-09 江苏国泉泵业制造有限公司 一种高压多级离心泵
US20130209225A1 (en) * 2010-06-30 2013-08-15 Schlumberger Technology Corporation Durable pumps for abrasives
CN105864053A (zh) * 2016-04-29 2016-08-17 武汉船用机械有限责任公司 一种立式多级潜液泵
US20170248159A1 (en) * 2014-08-08 2017-08-31 Schlumberger Technology Corporation Anti-swirl rib system for a pump
US10890189B2 (en) 2016-06-01 2021-01-12 Schlumberger Technology Corporation Submersible pumping system having thrust pad flow bypass
US20210156397A1 (en) * 2019-11-27 2021-05-27 Sulzer Management Ag Multistage centrifugal pump
US11629733B2 (en) 2020-09-23 2023-04-18 Schlumberger Technology Corporation Anti-swirl ribs in electric submersible pump balance ring cavity
EP4390134A1 (fr) * 2022-12-20 2024-06-26 Xylem Europe GmbH Pompe submersible à plusieurs étages

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155547B (en) * 1984-03-01 1987-07-15 Hughes Tool Co Wear resistant inserts for pumps

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779668A (en) * 1972-05-11 1973-12-18 Mcneil Corp Stage for a centrifugal pump
US4063846A (en) * 1974-11-13 1977-12-20 Borg-Warner Corporation Pump impeller improvement
US4120606A (en) * 1975-10-30 1978-10-17 Klein, Schanzlin & Becker Aktiengesellschaft Submersible motor pump
US4406582A (en) * 1981-05-19 1983-09-27 Marley-Wylain Company Submersible pump discharge head
US4586880A (en) * 1983-04-29 1986-05-06 Mitsubishi Denki Kabushiki Kaisha Submersible motor and pump assembly
US4708589A (en) * 1985-09-19 1987-11-24 The Marley-Wylain Company Roll-formed submersible pump
US4720242A (en) * 1987-03-23 1988-01-19 Lowara, S.P.A. Centrifugal pump impeller
US4802819A (en) * 1987-09-14 1989-02-07 Mcneil (Ohio) Corporation Centrifugal pump
US4838758A (en) * 1987-12-28 1989-06-13 Baker Hughes Incorporated Reduced diameter downthrust pad for a centrifugal pump
US4859144A (en) * 1988-03-07 1989-08-22 The Hoover Company Fan stage configuration
US4923367A (en) * 1988-03-14 1990-05-08 Flint & Walling, Inc. Submersible pump with plastic housing
US5456577A (en) * 1994-07-28 1995-10-10 Ingersoll-Dresser Pump Company Centrifugal pump with resiliently biasing diffuser
US20090191061A1 (en) * 2005-07-19 2009-07-30 Davey Products Pty Ltd Impeller Arrangement and Pump
US8231342B2 (en) * 2005-07-19 2012-07-31 Davey Products Pty Ltd. Impeller arrangement and pump
US20110052402A1 (en) * 2008-01-19 2011-03-03 Laurent Costaquec Fastening of the rotor of a centrifugal pump befestigung de laufrades einer kreisel pumpe
US8535001B2 (en) * 2008-01-19 2013-09-17 Wilo Ag Fastening of the rotor of a centrifugal pump
US20110210857A1 (en) * 2008-09-14 2011-09-01 Sicherungsgerätebau GmbH Sensor unit for checking of monitoring areas of double-walled containers or double-walled pipelines, or double-walled vessels
ITTO20100041A1 (it) * 2010-01-22 2011-07-23 Itt Mfg Enterprises Inc Pompa centrifuga
WO2011089512A3 (fr) * 2010-01-22 2011-12-01 Itt Manufacturing Enterprises, Inc. Pompe centrifuge
US8556580B2 (en) * 2010-02-05 2013-10-15 Baker Hughes Incorporated Submersible pump for operation in sandy environments, diffuser assembly, and related methods
US20110194926A1 (en) * 2010-02-05 2011-08-11 Baker Hughes Incorporated Submersible Pump for Operation In Sandy Environments, Diffuser Assembly, And Related Methods
US20130209225A1 (en) * 2010-06-30 2013-08-15 Schlumberger Technology Corporation Durable pumps for abrasives
US20120020777A1 (en) * 2010-06-30 2012-01-26 Schlumberger Technology Corporation Durable pumps for abrasives
CN102444588A (zh) * 2011-11-18 2012-05-09 江苏国泉泵业制造有限公司 一种高压多级离心泵
US20170248159A1 (en) * 2014-08-08 2017-08-31 Schlumberger Technology Corporation Anti-swirl rib system for a pump
US10738794B2 (en) * 2014-08-08 2020-08-11 Schlumberger Technology Corporation Anti-swirl rib system for a pump
CN105864053A (zh) * 2016-04-29 2016-08-17 武汉船用机械有限责任公司 一种立式多级潜液泵
CN105864053B (zh) * 2016-04-29 2017-12-15 武汉船用机械有限责任公司 一种立式多级潜液泵
US10890189B2 (en) 2016-06-01 2021-01-12 Schlumberger Technology Corporation Submersible pumping system having thrust pad flow bypass
US20210156397A1 (en) * 2019-11-27 2021-05-27 Sulzer Management Ag Multistage centrifugal pump
US11629733B2 (en) 2020-09-23 2023-04-18 Schlumberger Technology Corporation Anti-swirl ribs in electric submersible pump balance ring cavity
EP4390134A1 (fr) * 2022-12-20 2024-06-26 Xylem Europe GmbH Pompe submersible à plusieurs étages

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Publication number Publication date
ZA713461B (en) 1972-01-26
GB1290635A (fr) 1972-09-27

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AS Assignment

Owner name: MARLEY-WYLAIN COMPANY THE

Free format text: EFFECTIVE JULY 10, 1981. CERTIFICATE OF CORRECTION FROM THE SECRETARY OF STATE OF DELAWARE TO CORRECT THE THIRD PARAGRAPH OF CERTIFICATE OF MERGER.;ASSIGNORS:MARLEY-WYLAIN COMPANY THE (INTO);NEW MWY, INC. (CHANGED TO);REEL/FRAME:003925/0530

Effective date: 19810709