WO2006008844A1 - Pompe à moteur - Google Patents

Pompe à moteur Download PDF

Info

Publication number
WO2006008844A1
WO2006008844A1 PCT/JP2004/017204 JP2004017204W WO2006008844A1 WO 2006008844 A1 WO2006008844 A1 WO 2006008844A1 JP 2004017204 W JP2004017204 W JP 2004017204W WO 2006008844 A1 WO2006008844 A1 WO 2006008844A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
shaft
motor
bottom portion
interstage
Prior art date
Application number
PCT/JP2004/017204
Other languages
English (en)
Inventor
Kenichi Kajiwara
Junya Kawabata
Yoshiaki Miyazaki
Original Assignee
Ebara Corporation
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 Ebara Corporation filed Critical Ebara Corporation
Publication of WO2006008844A1 publication Critical patent/WO2006008844A1/fr

Links

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
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • 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
    • 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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft sealings especially adapted for liquid pumps

Definitions

  • the present invention relates to a motor pump, and more particularly to a motor pump having at least one impeller fixed to a pump shaft extending from a motor shaft and at least one casing which houses the impeller.
  • a multistage pump comprising a plurality of impellers fixed to a pump shaft extending from a motor shaft and a plurality of stacked interstage casings for housing the respective impellers.
  • a multistage pump comprising a plurality of impellers fixed to a pump shaft composed of a spline shaft and a plurality of stacked interstage casings which are formed by press working of a steel plate and house the respective impellers.
  • a plurality of impellers are fixed to- a pump shaft by a spline.
  • the portion of the pump shaft where a mechanical seal is mounted is normally formed into a larger outer diameter than the outer diameter of the portion to be processed through the spline working. Therefore, the pump shaft is required to be machined before the spline working such that the portion of the pump shaft to be processed through the spline working has a smaller outer diameter than the portion of the pump shaft where the mechanical seal is mounted. Thus, manufacturing cost of the pump shaft is increases.
  • a pump shaft having the same outer diameter at the portion where a mechanical seal is mounted and at the portion to be processed through the spline working is used without machining the portion to be processed through the spline working, and the pump shaft having the same outer diameter is processed through the spline working.
  • the portion of the pump shaft which has been processed through the spline working has an outer diameter larger than that of the portion of the pump shaft where the mechanical seal is mounted, a standard mechanical seal available on the market cannot be used, and hence a special mechanical seal is required to be manufactured. Thus, manufacturing cost increases.
  • the present invention has been made in view of the above drawbacks. It is therefore an object of the present invention to provide a motor pump which can use a standard mechanical seal available on the market without need for machining the portion of the pump shaft to be processed through spline working for mounting an impeller, and can prevent liquid from entering a bearing or the like located at a motor side even if the liquid leaks through the mechanical seal.
  • a motor pump comprising: at least one impeller fixed to a main shaft comprising a motor shaft and a pump shaft; at least one casing provided so as to correspond to the impeller; a pump head configured to seal an open end of the casing hermetically; a bearing held by the pump head for supporting the main shaft rotatably; a bearing plate provided on the main shaft adjacent to the bearing; and a Iiquid-removing member mounted on the main shaft and located in the opposite direction of the bearing with respect to the bearing plate.
  • a liquid- removing member is provided at the pump side with respect to the bearing provided at the motor side for supporting the pump shaft of the motor pump, even if liquid leaks through the mechanical seal, the liquid is prevented from entering the bearing located at the motor side.
  • the sleeve is provided on the spline section of the pump shaft, and a standard mechanical seal available on the market is -mounted-on the sleeve, the portion of- the pump shaft to be processed through the spline working is not required to be machined, and the standard mechanical seal available on the market can be used.
  • the bearing plate may comprise sheet metal.
  • the liquid-removing member may comprise a V-ring made of rubber.
  • the main shaft may have a step whose diameter is smaller than the diameter of the portion where the bearing plate is mounted, a positioning member may be positioned in an axial direction of the main shaft by the step, and the position of the liquid-removing member may be fixed by an end surface of the positioning member.
  • the motor shaft and the pump shaft may comprise separate members, and the pump shaft may be coupled to the motor shaft by press fitting, thereby forming the step.
  • the casing may include a plurality of stacked interstage casings which house a plurality of impellers, respectively; the interstage casing comprising a first cylindrical portion, a first bottom portion which is held in contact with an axial end face of an adjacent interstage casing, a second cylindrical portion extending axially from the first bottom portion, and a second bottom portion extending radially inward from the second cylindrical portion; and the second bottom portion of the interstage casing being formed into a curved shape of a hemisphere or substantially a hemisphere.
  • a suction plate may be attached to the second bottom portion of the interstage casing so that an outer circumferential end face of the suction plate is held in contact with an inner surface of a first cylindrical portion of the adjacent interstage casing; and the suction plate, the second cylindrical portion, the first bottom portion, and the inner surface of the first cylindrical portion of the adjacent interstage casing may form a space for accommodating an 0-ring.
  • return guide vanes may be interposed between the suction plate and a side plate.
  • a baffle may be provided in the interstage casing so as to cover at least one formed portion located at a corner between the first cylindrical portion and the second bottom portion.
  • a motor pump comprising: at least one impeller fixed to a main shaft comprising a motor shaft and a pump shaft, the pump shaft having a spline section for holding the impeller; at least one casing provided so as to correspond to the impeller; a positioning member which is positioned at a step formed at a joint portion of the motor shaft and the pump shaft; a sleeve which is fitted over the spline section and the positioning member, the sleeve holding a rotating member of a mechanical seal; and an 0-ring provided in a gap between the sleeve and the pump shaft.
  • the sleeve may comprise a thin pipe.
  • the sleeve may be positioned by a ring attached to a groove formed in the spline section of the main shaft.
  • At- least one of the portion of the sleeve fitted over the spline section, the portion of the sleeve fitted over the positioning member, the portion of the sleeve for holding the rotating member of the mechanical seal may be expanded radially outwardly or is shrinked radially inwardly.
  • FIG. 1 is a vertical cross-sectional view of a horizontal-type multistage motor pump according to an embodiment of the present invention
  • FIG. 2 is an enlarged cross-sectional view of adjacent interstage casings shown in FIG. 1;
  • FIG. 3 is a view showing the interior of the interstage casing, as viewed from an arrow III of FIG. 2, ; and
  • FIG. 4 is an enlarged fragmentary cross-sectional view of the multistage motor pump shown in FIG. 1.
  • FIGS. 1 through 4 A motor pump according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 through 4.
  • a horizontal-type multistage pump which comprises a plurality of vertically stacked interstage casings formed through press working of a steel plate and a plurality of impellers housed in the respective interstage casings will be described.
  • FIGS. 1 through 4 like or corresponding parts are denoted by like or corresponding reference numerals throughout views, and repetitive description is eliminated.
  • FIG. 1 is a vertical cross-sectional view of a horizontal-type multistage motor pump.
  • a horizontal-type multistage- motor • pump comprises a plurality of-- stacked interstage casings 1 which are formed through press working of a steel plate, a suction casing 2 provided on the left side of the stacked interstage casings 1, and a pump head 3 provided on the right side of the stacked interstage casings 1.
  • a motor 40 is coupled to the pump head 3 by a plurality of bolts 60.
  • the flange 2f of the suction casing 2 and the pump head 3 are coupled to each other by a plurality of casing bolts 8. Specifically, the casing bolts 8 are inserted into bolt holes 2h formed in the flange 2f of the suction casing 2, and the lower ends of the casing bolts 8 are screwed into the pump head 3, whereby the multistage interstage casings 1, the suction casing 2, and the pump head 3 are integrally coupled to each other.
  • a plurality of impellers 11 are fixed to a pump shaft 10, and each of the impellers 11 is housed in each of the interstage casings 1.
  • the pump shaft 10 comprises a spline shaft, and each of the impellers 11 has a plurality of grooves fitted over the spline shaft at the inner peripheral portion thereof.
  • a mechanical seal 12 is mounted on the upper portion of the pump shaft 10 to perform a shaft seal of the portion where the pump shaft 10 passes through the pump casing.
  • the end portion of the pump shaft 10 is inserted into a motor shaft 41 of the motor 40 by press fit, whereby the pump shaft 10 and the motor shaft 41 are integrally coupled to each other to constitute a main shaft 4.
  • the motor 40 comprises a stator 43 provided in a motor casing 42, a rotor 44 fixed to the motor shaft 41, and a fan 45 fixed to the end of the motor shaft 41.
  • the motor casing 42 comprises a substantially cylindrical motor frame 46, and an end cover 47 which covers the end portion of the motor frame 46.
  • the motor shaft 41 of the motor 40 is rotatably supported by a bearing 48 held by the end cover 47 and a bearing 49 held by a bearing housing portion 3c of the pump head 3.
  • the motor shaft 41 and the pump shaft 10 are integrated by press fit to constitute the main shaft 4, and hence the integrated main shaft 4 is rotatably supported by the bearings 48 and 49.
  • the bearings 48 and 49 comprise a ball bearing.
  • a suction port 2a is formed in the suction casing 2, and a discharge port 3a is formed in the pump head 3.
  • FIG. 2 is an enlarged cross-sectional view showing a portion of the structure including the interstage casings 1 shown in FIG. 1.
  • each of the interstage casings 1 is substantially in the form of a cylindrical receptacle.
  • each of the interstage casings 1 includes a first cylindrical portion 21, a protruding portion 22 protruding radially outward from the first cylindrical portion 21, a first bottom portion 23 extending radially inward from the protruding portion 22, a second cylindrical portion 24 extending axially from the first bottom portion 23, and a second bottom portion 25 extending radially inward from the second cylindrical portion 24.
  • the interstage casings 1 are made of stainless steel plates by press forming.
  • the protruding portion 22 has a maximum outer diameter larger than the outer diameter of the first cylindrical portion 21.
  • the second cylindrical portion 24 has an outer diameter slightly smaller than the inner diameter of the first cylindrical portion 21.
  • the first bottom portion 23 is arranged so as to be perpendicular to the first cylindrical portion 21.
  • the first cylindrical portion 21 has an axial end face 21a which is held in contact with a first bottom portion 23 of an adjacent interstage casing 1 substantially over the entire surface of the axial end face 21a. As long as the end face 21a of the first cylindrical portion 21 can maintain a contacting area with the adjacent first bottom portion 23, the first bottom portion 23 may be inclined at a predetermined angle with respect to the first cylindrical portion 21 rather than perpendicular to the first cylindrical portion 21.
  • the second bottom portion 25 of the interstage casing 1 is formed into a curved shape of a hemisphere or substantially a hemisphere.
  • a suction plate 30 is attached to the second bottom portion 25 by welding.
  • a plurality of return guide vanes 34 are interposed between the suction plate 30 and a side plate 32 and attached to the suction plate 30 and the side plate 32 by welding.
  • the suction plate 30 is also formed into a curved shape of a hemisphere or substantially a hemisphere so as to be held in contact with a surface of the second bottom portion 25.
  • the suction plate 30 has an outer circumferential end face 30a which is held in contact with an inner surface of a first cylindrical portion 21 of an adjacent interstage casing 1.
  • the interstage casing 1 has a simple structure which can be manufactured simply by press forming. Accordingly, it is possible to readily form a space for an 0-ring disposed between adjacent interstage casings with high accuracy. Thus, it is possible to maintain stable sealing capability and stable sealing accuracy.
  • Such a space for an 0-ring may be changed in shape such that a commercially available 0-ring is fitted
  • the interstage casing 1 since the second bottom portion 25 of the interstage casing 1 is formed into a curved shape of a hemisphere or substantially a hemisphere, the interstage casing 1 has a high pressure resistance.
  • a liner ring 28 is mounted on an innermost portion 26 of the second bottom portion 25 of the interstage casing 1 to prevent water having a high pressure from leaking into the suction side of the impeller 11.
  • a baffle 36 is disposed in the interstage casing 1 so as to cover the protruding portion 22, the first bottom portion 23, the second cylindrical portion 24, and an outer peripheral portion of the second bottom portion 25.
  • the baffle 36 is bonded to the second bottom portion 25 of the interstage casing 1 by welding. Even if solid matter such as stones flows into the interstage casing 1, the baffle 36 can protect the protruding portion 22, the first bottom portion 23, the second cylindrical portion 24, and the outer peripheral portion of the second bottom portion 25 from the solid matter. Particularly, the baffle 36 protects a stepped portion formed at a corner of the interstage casing 1.
  • the baffle 36 may be eliminated depending on purposes of the pump.
  • FIG. 3 is a view taken in a direction of an arrow III of FIG. 2.
  • FIG. 3 shows an interior of the interstage casing 1.
  • the baffle 36 has a spline structure at a radially inner portion thereof.
  • the baffle 36 has a number of notches (grooves) 36a extending radially outward.
  • the second bottom portion 25 of the interstage casing 1 is exposed at the notches 36a of the baffle 36 and covered with the baffle 36 at portions other than the notches 36a of the baffle 36.
  • depressions and projections are- formed on a - surface of the second bottom portion 25 facing the impeller 11 by the notches 36a of the baffle 36.
  • the depth of the depressions and the thickness of the projections correspond to the thickness of the baffle 36.
  • Rotational energy is applied to a fluid in a space between the impeller 11 and the second bottom portion 25 by rotation of the impeller 11.
  • the depressions and projections formed on the surface of the second bottom portion 25 can reduce the rotational energy of the fluid between the impeller 11 and the second bottom portion 25. Accordingly, it is possible to prevent a static pressure of the fluid between the impeller 11 and the second bottom portion 25 from being lowered. Thus, a thrust force applied to the impeller 11 can be reduced.
  • FIG. 4 is an enlarged fragmentary cross-sectional view of the multistage motor pump shown in FIG. 1.
  • the bearing 49 for supporting the main shaft 4 comprising the pump shaft 10 and the motor shaft 41 which are integrated by press fit is fixed to the bearing housing portion 3c of the pump head 3 by a snap ring (retaining ring) 51.
  • a bearing plate 52 made of sheet metal is mounted on the motor shaft 41 so that the bearing plate 52 is located adjacent to the bearing 49.
  • a water- removing ring 53 constituting a liquid-removing member is mounted on the motor shaft 41 so that the water-removing ring 53 is located adjacent to the bearing plate 52.
  • a positioning member 55 is provided using a step 41s defined by an end surface of the motor shaft 41 at the joint porti-on of the motor shaft 41 and- the -pump shaft -10. Specifically, the positioning member 55 is mounted on the motor shaft 41 in such a manner that the positioning member 55 is brought into close contact with the step 41s of the motor shaft 41, whereby positioning of the water-removing ring 53 is performed by the end surface 55a of the positioning member 55.
  • the water-removing ring 53 is pressed against the end surface 55a of the positioning member 55, and when the motor shaft 41 rotates, the water-removing ring 53 rotates together with the motor shaft 41.
  • the liquid which has leaked is removed by the water-removing ring 53, and the liquid is prevented from entering the motor side.
  • the mechanical seal 12 comprises a sleeve 61 composed of a thin pipe provide so as to cover a spline section 10s of the pump shaft 10, a rotating assembly 62 including a rotating seal ring mounted on the sleeve 61, and a stationary assembly 63 including a stationary seal ring which is brought into sliding contact with the rotating seal ring.
  • the end portion of the sleeve 61 is expanded radially outwardly to increase an inner diameter thereof and is fitted over the positioning member 55, and the other end portion of the sleeve 61 is shrinked radially inwardly to decrease an inner diameter thereof and is fitted over the spline section 10s.
  • an 0-ring 65 is mounted on the pump shaft 10 to hermetically seal a gap between the sleeve 61 and the pump shaft 10.
  • the sleeve 61 is formed so as to have an inner diameter di fitted over the spline section 10s, an outer diameter D suitable for using a mechanical seal available on the market, and an inner diameter d2 expanded from the outer diameter D and suitable for using an 0-ring available on the market.
  • the sleeve -61-- is made of a thin pipe being available on the market and having an outer diameter D, one end portion of the sleeve 61 is shrinked into the inner diameter di fitted over the spline section 10s, and the other end portion of the sleeve 61 is expanded into the inner diameter d 2 so that the O-ring 65 available on the market can be used.
  • the sleeve 61 is formed by expanding and/or shrinking a thin pipe, as a raw material, which has an outer diameter ranging from di to d 2 .
  • the portion having the inner diameter di is formed by shrinking the thin pipe, and the portions having the outer diameter D and the inner diameter d 2 are formed by expanding the thin pipe, respectively.
  • the thin pipe has an outer diameter ranging from D to d 2
  • the portions having the inner diameter di and the outer diameter D are formed by shrinking the thin pipe, respectively, and the portion having the inner diameter d 2 is formed by expanding the thin pipe.
  • the thin pipe is formed into the sleeve 61 such that the inner diameter di of the sleeve 61 is fitted over the outer diameter of the pump shaft 10, the outer diameter D of the sleeve 61 is fitted into the inner diameter of the mechanical seal, and the inner diameter d 2 of the sleeve 61 accommodates the 0-ring 65 available on the market.
  • the sleeve 61 has one end which is brought into close contact with the positioning member 55, and the other end which is brought into close contact with a C-shaped snap ring 64 fitted into a groove 1Og formed in the spline section 10s, whereby positioning of the sleeve 61 is performed.
  • a ring member 66 for covering an end of the rotating assemble of the mechanical seal 12 is mounted on the spline section 10s. ⁇ - .. _ ._.
  • the sleeve 61 made of a thin pipe is provided so as to cover the spline section 10s of the pump shaft 10, the mechanical seal available on the market can be fitted over the sleeve, and the 0-ring 65 available on the market can be used to hermetically seal the gap between the sleeve 61 and the pump shaft 10.
  • liquid drawn in from the suction port 2a is introduced into the suction casing 2, and is pressurized by the first-stage impeller 11 in the suction casing 2.
  • the liquid discharged from the first-stage impeller 11 passes through passages defined by the return blades 34 provided between the suction plate 30 and the side plate 32, and is then introduced into a suction port of the next-stage impeller 11 in the interstage casing 1.
  • the liquid is pressurized by each of the impellers 11 in each of the interstage casings 1, and the pressure head of the liquid is recovered while the liquid passes through each of the passages defined by the return blades 34.
  • the liquid is pressurized by the final-stage impeller 11, and is then discharged from the discharge port 3a of the pump head 3 to the outside of the pump.
  • this multistage pump can also be used as a vertical type multistage pump.
  • the present invention is applicable to a motor pump having at least one impeller fixed to a pump shaft extending from a motor shaft and at -lea-st- one -casing which houses the impeller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L’invention porte sur une pompe à moteur comprenant au moins un rotor (11) fixé à l’arbre de pompe (10) s’étendant depuis un arbre de moteur (41) et au moins un carter (1, 2) logeant le rotor. La pompe à moteur contient en outre une tête de pompe (3) configurée pour étanchéifier une extrémité ouverte du carter de manière hermétique, un palier (49) maintenu par la tête de pompe (3) pour supporter l’arbre principal (4) en rotation, une plaque de palier (52) adjacente au palier (49) et un élément suppresseur de liquide (53) monté sur l’arbre principal et situé dans la direction opposée du palier par rapport à la plaque de palier.
PCT/JP2004/017204 2004-07-16 2004-11-12 Pompe à moteur WO2006008844A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004210736A JP4642399B2 (ja) 2004-07-16 2004-07-16 モータポンプ
JP2004-210736 2004-07-16

Publications (1)

Publication Number Publication Date
WO2006008844A1 true WO2006008844A1 (fr) 2006-01-26

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ID=34959222

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2004/017204 WO2006008844A1 (fr) 2004-07-16 2004-11-12 Pompe à moteur

Country Status (2)

Country Link
JP (1) JP4642399B2 (fr)
WO (1) WO2006008844A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101832270A (zh) * 2009-03-10 2010-09-15 格伦德福斯管理联合股份公司 多级离心泵
CN102852812A (zh) * 2011-06-27 2013-01-02 王喜冬 硬质合金可空转可串联水陆两用矿用立泵
CN102852811A (zh) * 2011-06-27 2013-01-02 王喜冬 硬质合金可空转可串联水陆两用矿用立泵
US8568093B2 (en) 2009-03-10 2013-10-29 Grundfos Management A/S Multi-stage centrifugal pump assembly (bearing carrier)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852807A (zh) * 2011-06-27 2013-01-02 王喜冬 硬质合金可空转可串联水陆两用矿用立泵
JP2017122408A (ja) * 2016-01-07 2017-07-13 Ｋａｗａｍｏｔｏ Ｇｅｃ株式会社 ポンプケーシング、及び、ポンプ装置

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US3838901A (en) * 1973-07-27 1974-10-01 Gen Motors Corp Automotive waterpump subassembly with improved sealing arrangement
US3897178A (en) * 1972-09-09 1975-07-29 Frankl & Kirchner Pumping system
JPH08214495A (ja) * 1995-01-31 1996-08-20 Ebara Corp 回転機械
EP1260724A1 (fr) * 2000-12-28 2002-11-27 Koyo Seiko Co., Ltd. Joint pour palier de pompe a eau
JP2003214396A (ja) * 2002-01-21 2003-07-30 Ebara Corp 多段ポンプ
EP1424496A1 (fr) * 2001-09-04 2004-06-02 Nsk Ltd., Dispositif d'etancheite pour pompe a eau, dispositif de support rotatif pour pompe a eau et pompe a eau

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Publication number Priority date Publication date Assignee Title
US2997958A (en) * 1960-06-13 1961-08-29 Heinicke Pump Co Centrifugal pump
US3897178A (en) * 1972-09-09 1975-07-29 Frankl & Kirchner Pumping system
US3838901A (en) * 1973-07-27 1974-10-01 Gen Motors Corp Automotive waterpump subassembly with improved sealing arrangement
JPH08214495A (ja) * 1995-01-31 1996-08-20 Ebara Corp 回転機械
EP1260724A1 (fr) * 2000-12-28 2002-11-27 Koyo Seiko Co., Ltd. Joint pour palier de pompe a eau
EP1424496A1 (fr) * 2001-09-04 2004-06-02 Nsk Ltd., Dispositif d'etancheite pour pompe a eau, dispositif de support rotatif pour pompe a eau et pompe a eau
JP2003214396A (ja) * 2002-01-21 2003-07-30 Ebara Corp 多段ポンプ

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101832270A (zh) * 2009-03-10 2010-09-15 格伦德福斯管理联合股份公司 多级离心泵
EP2233748A1 (fr) 2009-03-10 2010-09-29 Grundfos Management A/S Pompe centrifuge à plusieurs étages
US8366388B2 (en) 2009-03-10 2013-02-05 Grundfos Management A/S Multi-stage centrifugal pump (axial face seal)
US8568093B2 (en) 2009-03-10 2013-10-29 Grundfos Management A/S Multi-stage centrifugal pump assembly (bearing carrier)
EP2228538B1 (fr) * 2009-03-10 2015-09-16 Grundfos Management A/S Agrégat de pompe centrifuge à plusieurs niveaux
CN102852812A (zh) * 2011-06-27 2013-01-02 王喜冬 硬质合金可空转可串联水陆两用矿用立泵
CN102852811A (zh) * 2011-06-27 2013-01-02 王喜冬 硬质合金可空转可串联水陆两用矿用立泵
CN102852811B (zh) * 2011-06-27 2015-08-26 王喜冬 硬质合金可空转可串联水陆两用矿用立泵
CN102852812B (zh) * 2011-06-27 2015-11-25 王喜冬 硬质合金可空转可串联水陆两用矿用立泵

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JP2006029242A (ja) 2006-02-02
JP4642399B2 (ja) 2011-03-02

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