EP2505842B1 - Mehrstufiges kreiselpumpenaggregat - Google Patents

Mehrstufiges kreiselpumpenaggregat Download PDF

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Publication number
EP2505842B1
EP2505842B1 EP11002578.0A EP11002578A EP2505842B1 EP 2505842 B1 EP2505842 B1 EP 2505842B1 EP 11002578 A EP11002578 A EP 11002578A EP 2505842 B1 EP2505842 B1 EP 2505842B1
Authority
EP
European Patent Office
Prior art keywords
centrifugal pump
liquid
impeller group
impeller
pump assembly
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.)
Revoked
Application number
EP11002578.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2505842A1 (de
Inventor
Steen Mikkelsen
Bo Møller Jensen
Aage Bruhn
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.)
Grundfos Management AS
Original Assignee
Grundfos Management AS
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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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=44515211&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2505842(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Grundfos Management AS filed Critical Grundfos Management AS
Priority to EP11002578.0A priority Critical patent/EP2505842B1/de
Priority to IN817DE2012 priority patent/IN2012DE00817A/en
Priority to AU2012201654A priority patent/AU2012201654B2/en
Priority to RU2012112043/06A priority patent/RU2578778C2/ru
Priority to CN2012100942511A priority patent/CN102734176A/zh
Priority to CN201910559567.5A priority patent/CN110307166A/zh
Priority to US13/433,398 priority patent/US9879680B2/en
Publication of EP2505842A1 publication Critical patent/EP2505842A1/de
Publication of EP2505842B1 publication Critical patent/EP2505842B1/de
Application granted granted Critical
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/02—Self-priming pumps

Definitions

  • the invention relates to a multi-stage centrifugal pump unit with at least three impellers, d. H. an at least three-stage centrifugal pump unit.
  • DE 22 49 883 A1 discloses a self-priming centrifugal pump which has a second blade arrangement on its impeller, which generates an additional flow for suction.
  • DE 1 703 603 discloses a multi-stage self-priming centrifugal pump.
  • the multi-stage centrifugal pump unit according to the invention has at least three impellers, which are preferably arranged on a common shaft and are driven by a motor, in particular an electric motor, via these.
  • the multi-stage centrifugal pump unit according to the invention is constructed in such a way that it has two successive impeller groups, ie groups of pump stages, in the direction of flow.
  • the first impeller group in the flow direction is designed in such a way that it enables the centrifugal pump to self-priming.
  • a backflow channel is present in the first impeller group, which connects the output side of the first impeller group with its input side. This backflow channel enables a liquid flow through the backflow channel and through the impeller to be effected within the first impeller group by its at least two impellers. I.e. A limited amount of liquid can be circulated in the first impeller group.
  • This circulating amount of liquid causes a sufficient suction effect in the first impeller group in order to draw in further liquid. This means that the entire centrifugal pump unit can automatically draw in liquid. It is only preferred that a limited amount of liquid is always present in the first impeller group, in particular in the return flow channel, in order to ensure that the circulating flow through the impellers of the first impeller group and the return flow channel can start when the pump is started up.
  • At least one valve for closing the return flow channel is present in the return flow channel.
  • This valve can be used to close the return flow channel when the pump has reached its normal operating state. In the normal operating state, when the pump unit is pumping liquid, an open return flow channel and a constant liquid return would impair the efficiency of the centrifugal pump unit. This can be done by closing the valve be prevented after the pump has started up, so that the pump then works like a conventional multi-stage centrifugal pump.
  • the valve is preferably designed such that it closes the return flow channel when a predetermined fluid pressure is reached in the return flow channel or on the exit side of the first impeller group. Reaching the predetermined fluid pressure is recognized as a normal operating state or an operating state in which there is already a sufficient delivery flow when further liquid is drawn in.
  • the fluid pressure in the return flow channel i.e.. H. detected on the output side of the first impeller group.
  • the valve is preferably designed as a spring element, wherein it is kept open by spring action against the fluid pressure prevailing in the return flow channel. When the fluid pressure exceeds the spring force, the valve is closed.
  • the first impeller group is formed at least in two stages with two impellers arranged one behind the other in the flow direction.
  • the return flow channel is arranged such that it leads from the output side of the second impeller to the input side of the first impeller.
  • the two-stage first impeller group enables sufficient flow and suction to be achieved by conveying the liquid in the circuit through the return flow channel in order to generate a sufficient negative pressure overall for suctioning liquid in the suction mouth or suction channel of the centrifugal pump unit.
  • a separating element which is designed to separate air and liquid, is preferably arranged on the output side of the first impeller group. Especially when starting up the pump unit when only a little liquid is initially conveyed through the return flow channel, the centrifugal pump unit will also suck in air through its suction line, with air and liquid ideally mixing when entering the first impeller. It is therefore expedient to separate the air from the liquid on the outlet side of the first impeller group, in order to preferably exclusively return liquid through the return channel to the inlet side of the first impeller group. This prevents the backflow channel from running dry.
  • the separating element is further preferably arranged relative to the return flow channel in such a way that the liquid emerging from the separating element enters the return flow channel. This ensures that the liquid flowing from the return flow channel into the first impeller group, when it exits the first impeller group, substantially completely re-enters the return channel in order to create a circuit.
  • a check valve or a backflow preventer is preferably arranged on the input side of the first impeller group, which prevents liquid from running out of the centrifugal pump unit back into a suction line. This prevents the centrifugal pump unit from running completely dry; rather, the non-return valve keeps liquid inside the centrifugal pump unit even when the centrifugal pump unit is taken out of operation, which fluid enables restarting and renewed suction.
  • the check valve can be integrated directly into the centrifugal pump unit, but can also be attached to the suction port of the centrifugal pump unit as a separate component.
  • At least one liquid reservoir is arranged between the first and the second impeller group.
  • the liquid reservoir is designed in such a way that it fills with liquid during normal operation of the centrifugal pump unit.
  • the centrifugal pump unit is taken out of operation or in the event that the centrifugal pump unit should deliver air bubbles, the liquid in the liquid reservoir can ensure that the pumping action of the centrifugal pump unit does not completely stop, but that there is always enough liquid in the centrifugal pump unit to suck in again To allow liquid through the suction nozzle or the suction line of the centrifugal pump unit.
  • the liquid reservoir preferably has at least one outlet opening which is arranged such that it is opposite an inlet opening of the return flow channel in such a way that liquid can flow from the liquid store into the return flow channel. This ensures that the return flow channel is initially filled or kept filled by the liquid reservoir.
  • the liquid from the return flow channel then flows to the inlet side of the first impeller of the first impeller group and enters it, so that this impeller can immediately achieve a conveying effect and can suck in further liquid through the suction line. Until liquid enters the first impeller from the suction line, the liquid in the return flow channel is then first circulated in the first impeller group, as described above.
  • the centrifugal pump unit according to the invention is preferably designed such that the axis of rotation of the impellers extends vertically.
  • the liquid reservoir described above is then preferably designed such that its outlet opening is arranged on the underside, so that the liquid emerges from the liquid reservoir downward due to gravity and enters the return flow channel can.
  • the liquid store is preferably filled from above via the liquid flowing to the pump stages arranged behind the liquid store or above the liquid store.
  • the return flow channel preferably has an opening directed upwards, so that the liquid from the liquid reservoir can enter this opening from above.
  • At least two liquid stores can be arranged such that an outlet opening of the second liquid store opens into an opening of a first liquid store.
  • two or more liquid reservoirs can be arranged one behind the other in the flow or delivery direction between the first impeller group and the second impeller group.
  • the liquid flows from the first or lower liquid reservoir, as described above, preferably into the return channel.
  • the liquid from the second or subsequent liquid store first flows into the first liquid store and from there into the return channel.
  • liquid can pass from a third liquid store into the second liquid store. All liquid stores preferably have an outlet opening on the underside and an inlet opening on the top side.
  • the at least one liquid reservoir is particularly preferably designed as an annular pot with an open top, which surrounds a shaft driving the impellers.
  • the pot is ring-shaped or toroidal and has an opening in the middle through which the shaft extends.
  • the opening also serves as a flow path for the conveyed liquid from the first impeller group to the second impeller group.
  • a free space surrounding the shaft is provided in the opening.
  • the top of the pot-shaped liquid reservoir is open, so that the liquid that flows through the central opening over the edge of the opening from above into the Pot-shaped liquid storage can enter.
  • the described at least one outlet opening is preferably formed on the underside.
  • the outlet openings of the subsequent liquid stores are arranged such that they are located above the top of the respective preceding liquid store, so that the liquid runs out of the outlet opening into the preceding liquid store. From the first, that is to say the lowest, liquid reservoir, the liquid runs out of the outlet opening, as described, into the return line.
  • the size of the outlet openings is such that the liquid stores slowly empty.
  • the individual impellers of the second impeller group are each arranged in a stepped module, with all the stepped modules having the same axial height, and the at least two impellers of the first impeller group are also arranged in such a stepped module, which has an axial height that the axial height or an integer multiple of the height of a step module of the second impeller group.
  • This modular structure with a fixed grid of the axial heights or lengths of the individual modules has the advantage that centrifugal pump units of different output, in particular different delivery and suction heights, can be realized very easily from the modules.
  • the first self-priming impeller group can also be easily integrated into conventional multi-stage centrifugal pumps, since the parts of the first impeller group have the same grid in their axial length as the modules of the second impeller group.
  • the same tensioning straps can be used to hold the modules together as are used in conventional multi-stage centrifugal pump units. The number of parts required can thus be reduced.
  • the liquid accumulators or spacing elements arranged between the two impeller groups also each have an axial height which corresponds to the axial height or an integer multiple of this height of a step module of the second impeller group.
  • the axial height fits into the existing grid of the axial height of the individual pump stages, which are arranged in the second impeller group.
  • the centrifugal pump unit described by way of example has a total of eight stages, ie eight impellers. Of which two impellers 2 are arranged in a first impeller group 4 and six impellers 6 in a second impeller group 8.
  • the first impeller group 4 faces the inlet or suction port 10 of the pump unit.
  • the second impeller group 8 is connected downstream of the first impeller group in the flow or conveying direction.
  • the liquid to be pumped flows through the individual impellers one after the other and becomes the output side of the the individual impellers and the output side of the last impeller 6 is fed to the pressure port 14 via the annular pressure channel 12. All impellers 2 and 6 are driven by a common shaft 16.
  • the shaft 16 is connected at its shaft end 18 to a motor, not shown here, for example an electric motor for driving.
  • the first impeller group 4 is designed to be self-priming in the manner described below, so that the centrifugal pump can suck in liquid via the suction nozzle 10 even when the suction nozzle 10 and an upstream suction line are not filled with liquid.
  • a separating element 20 is arranged on the output side of the second impeller 2 of the first impeller group 4 in the direction of flow. This is designed so that liquid and air are separated from each other. This is done in that the liquid is accelerated radially outward, so that the air in the central area near the shaft 16 and the liquid in the peripheral area near the peripheral wall 22 emerge from the separating element 20.
  • the liquid emerging from the separating element 20 flows over the peripheral wall 22 at its upper edge and enters a return flow channel 24.
  • the return flow channel 24 leads back on the outer circumference of the first impeller group 4 in the direction of the suction port 10.
  • the return flow channel leads to the suction mouth 28 of the first impeller 2 in the flow direction of the first impeller group 4 of the separating element 20 back through the return flow channel 24 to the suction mouth 28 of the first impeller 2.
  • the seals 30 seal the return channel 24 against the pressure channel 12, so that liquid is prevented from flowing over from the pressure side via the return channel 24 to the suction side in normal operation.
  • a bearing 32 is arranged in the interior of the separating element 20 and is in contact with the outer circumference of the shaft 16. This also serves to seal the separating element 20 with respect to the shaft 16 in order to prevent air from flowing out of the separating element 20 back to the impellers 2.
  • the seal 34 seals the axial end of the shaft 16 to prevent air from flowing from the pressure side of the pump over the shaft to the suction side.
  • the seal 36 also serves to separate the pressure side from the suction side, i. H. to seal the pressure port 14 against the suction port 10.
  • a valve 38 is arranged in the return flow channel 24.
  • This valve 38 is designed such that when a predetermined pressure is reached, it is on the output side of the second impeller 2, ie on the output side of the separating element 20 and in the return flow channel 24 closes the return flow channel. I.e. after reaching this predetermined pressure, the return flow channel 24 is closed and the liquid flows exclusively to the subsequent impellers 6 of the second impeller group 8.
  • Valve elements in the form of spring plates 46 are arranged at the openings 44. These spring plates 46 can assume two positions, namely an open position, which in Fig. 3 is designated by the reference numeral 46 '. In this position, the spring plate 46 'extends in a sinew shape to the inner circumference of the wall 40 and is therefore spaced apart from the opening 44, so that the latter is released. If the pressure now rises in the area of the return flow channel 24, which is located between the peripheral wall 22 and the wall 40, the spring plate 46 'is pressed radially outward and lies against the inside of the wall 40 above the opening 44, so that the Opening 44 is closed.
  • liquid reservoirs 48 are arranged between the first impeller group 4 and the second impeller group 8. These are detailed in Fig. 4 shown.
  • the liquid reservoirs 48 are designed as ring-shaped or toroidal pots which surround the shaft 16.
  • the shaft 16 extends through a central opening 50 of the liquid reservoir 48, the wall of the opening 50 being radially spaced from the outer circumference of the shaft 16.
  • the opening 50 also serves as a flow path for the liquid conveyed from the first impeller group 4 to the second impeller group 8.
  • the circumferential walls 52 of the openings 50 have a length in the direction of the longitudinal axis X which is shorter than the axial length of the outer walls of the liquid stores 48.
  • the liquid reservoirs 48 are thus opened at their top, so that liquid which flows through the openings 50 can flow over the peripheral walls 52 into the interior of the liquid reservoirs 48.
  • the liquid reservoirs 48 are filled when liquid flows from the first impeller group 4 to the second impeller group 8.
  • Each liquid reservoir 48 has an outlet opening 54 with a small diameter on its underside.
  • the outlet openings 54 are spaced radially from the longitudinal axis X to such an extent that they lie above the free space between the peripheral wall 22 and the wall 40 of the separating element 20.
  • the liquid runs from the first, ie lower, liquid store 48 directly into the return flow channel 24. From the two other liquid stores 48, the liquid first runs through the associated outlet opening 54 into the liquid store 48 located below.
  • a check valve or backflow preventer 55 is also arranged on or in the suction nozzle 10.
  • the check valve 55 is arranged directly in the suction nozzle, but it could also be attached to the suction nozzle 10 as a separate component.
  • Such a device can be used to prevent the liquid from the pump unit from running back into the suction line when the suction line adjoining the suction nozzle 10 runs dry. In this way, a certain amount of liquid can always be kept in the pump unit, via which at least the starting circuit in the first impeller group 4 can be put back into operation, in order to then draw in further liquid through the suction nozzle 10. In this way, the entire centrifugal pump unit is designed to be self-priming.
  • the pump unit is of modular construction overall, this modular construction being based on an axial length grid which is defined by the axial length of the pump stages formed by the impellers 6.
  • These pump stages each have a circumferential jacket 56, which forms the jacket of the individual stage modules.
  • These step modules are placed axially on top of each other.
  • the liquid reservoirs 48 have the same axial length as the jackets 56 of the step modules of the second impeller group 8.
  • a jacket 58 which surrounds the first impeller 2 also has the same axial length.
  • the separating element 20 has an axial length in the direction of the longitudinal axis X which corresponds to twice the axial length of the jackets 56 and 58.
  • the entire first impeller group 4 thus has an axial length which corresponds to three times the length of a step module of the second impeller group 8.
  • This uniform length grid favors the modular structure, since tensioning straps, which hold the individual step modules together in the axial direction, only in different lengths, which result from this underlying grids are defined, must be kept.
  • a wide variety of pumps can thus be assembled, with different numbers of impellers, liquid stores 48 and possibly the first impeller group 4 in order to ensure the self-priming properties.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP11002578.0A 2011-03-29 2011-03-29 Mehrstufiges kreiselpumpenaggregat Revoked EP2505842B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP11002578.0A EP2505842B1 (de) 2011-03-29 2011-03-29 Mehrstufiges kreiselpumpenaggregat
IN817DE2012 IN2012DE00817A (es) 2011-03-29 2012-03-21
AU2012201654A AU2012201654B2 (en) 2011-03-29 2012-03-21 Centrifugal radial pumps and method for manufacturing thereof
RU2012112043/06A RU2578778C2 (ru) 2011-03-29 2012-03-28 Многоступенчатый центробежный насосный агрегат
CN2012100942511A CN102734176A (zh) 2011-03-29 2012-03-29 多级离心泵机组
CN201910559567.5A CN110307166A (zh) 2011-03-29 2012-03-29 多级离心泵机组
US13/433,398 US9879680B2 (en) 2011-03-29 2012-03-29 Multi-stage centrifugal pump unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11002578.0A EP2505842B1 (de) 2011-03-29 2011-03-29 Mehrstufiges kreiselpumpenaggregat

Publications (2)

Publication Number Publication Date
EP2505842A1 EP2505842A1 (de) 2012-10-03
EP2505842B1 true EP2505842B1 (de) 2019-12-25

Family

ID=44515211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11002578.0A Revoked EP2505842B1 (de) 2011-03-29 2011-03-29 Mehrstufiges kreiselpumpenaggregat

Country Status (6)

Country Link
US (1) US9879680B2 (es)
EP (1) EP2505842B1 (es)
CN (2) CN110307166A (es)
AU (1) AU2012201654B2 (es)
IN (1) IN2012DE00817A (es)
RU (1) RU2578778C2 (es)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2607703B1 (de) * 2011-12-22 2014-06-18 Grundfos Holding A/S Kreiselpumpe
AU2014270689B2 (en) * 2013-05-22 2016-11-03 Grundfos Holding A/S Multistage self-suctioning centrifugal pump unit
DE102014214805A1 (de) * 2014-07-29 2016-02-04 Ksb Aktiengesellschaft Mantelgehäusepumpe
EP3244066B1 (en) * 2016-05-12 2020-11-18 Grundfos Holding A/S Centrifugal pump
DE102016109994A1 (de) 2016-05-31 2017-11-30 Eberspächer Climate Control Systems GmbH & Co. KG Seitenkanalgebläse, insbesondere für ein Fahrzeugheizgerät
EP3293397B1 (de) * 2016-09-13 2018-10-24 Grundfos Holding A/S Kreiselpumpenaggregat und verfahren zum entlüften
CN109996963B (zh) 2016-09-26 2021-01-26 流体处理有限责任公司 经由增材制造而产生的多级叶轮
EP3343054A1 (en) 2016-12-28 2018-07-04 Grundfos Holding A/S Bearing retainer for multistage centrifugal pump
CN108953158B (zh) * 2018-09-20 2024-07-12 南元泵业有限公司 多出口离心泵
US11560902B2 (en) * 2019-01-25 2023-01-24 Pentair Flow Technologies, Llc Self-priming assembly for use in a multi-stage pump
CN111594451A (zh) * 2020-05-29 2020-08-28 广东凌霄泵业股份有限公司 卧式自吸泵
EP3929445A1 (en) * 2020-06-22 2021-12-29 Grundfos Holding A/S Centrifugal pump device
CN112112840B (zh) * 2020-09-11 2022-09-23 南通大通宝富风机有限公司 一种家具厂风机过滤防护组件
CN117823415B (zh) * 2024-03-04 2024-05-03 山东华立供水设备有限公司 一种多级离心泵

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GB674815A (en) * 1950-05-15 1952-07-02 Schulz Wilhelm Improvements relating to centrifugal pumps
GB732293A (en) 1952-05-12 1955-06-22 Jacuzzi Brothers Inc Improvements in or relating to self-priming pump systems, particularly for deep wells
DE1703603A1 (de) * 1967-07-07 1972-04-06 Muanyagipari Kutato Intezet Ein- oder mehrstufige selbstansaugende Pumpe
DE2025117A1 (de) 1969-05-29 1970-12-03 Etablissements Pompes Guinard S.A., Saint-Cloud (Frankreich) Verbesserung von Zentrifugalpumpen mit automatischer Ansaugung
DE2707776C2 (de) 1976-02-27 1986-04-24 Le Matériel Téléphonique S.A., Boulogne-Billancourt Selbstansaugende Kreiselpumpe
DE3130832C2 (de) 1980-08-05 1986-05-22 Sihi Gmbh & Co Kg, 2210 Itzehoe Selbstansaugende Kreiselpumpe, insbesondere zur Förderung von Flüssigkeiten in der Nähe ihres Siedepunktes
JPS58143189A (ja) 1982-02-19 1983-08-25 Fuji Electric Co Ltd ポンプユニツトにおけるポンプ起動装置
US4780050A (en) * 1985-12-23 1988-10-25 Sundstrand Corporation Self-priming pump system
EP0619001B1 (en) 1991-12-05 1997-03-12 NOCCHI POMPE S.p.A. Centrifugal pump with adaptor for various valves
DE69520262T2 (de) 1994-12-20 2001-06-21 Bombas Electricas, S.A. (Boelsa) Mehrstufige elektrische Kreiselpumpe
CN2471976Y (zh) 2001-03-19 2002-01-16 佛山柴油机厂有限公司 壳体一体式多级自吸离心泵
DE10239997A1 (de) 2002-08-27 2004-03-04 Gardena Manufacturing Gmbh Pumpenanordnung
US20050196269A1 (en) * 2004-03-08 2005-09-08 Racer Donald W. Stacked self-priming pump and centrifugal pump
CN1811190A (zh) 2005-01-30 2006-08-02 陆雄 动态调控叶轮对称布置的多级离心泵轴向力的方法
EP1729009A1 (en) 2005-05-31 2006-12-06 Pedrollo S.p.a. Centrifugal pump
CN201610847U (zh) 2009-11-30 2010-10-20 镇江正汉泵业有限公司 一种提高自吸能力的立式自吸泵

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US9879680B2 (en) 2018-01-30
US20120251308A1 (en) 2012-10-04
RU2012112043A (ru) 2013-10-10
RU2578778C2 (ru) 2016-03-27
EP2505842A1 (de) 2012-10-03
IN2012DE00817A (es) 2015-08-21
CN110307166A (zh) 2019-10-08
CN102734176A (zh) 2012-10-17
AU2012201654A1 (en) 2012-10-18
AU2012201654B2 (en) 2015-08-20

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