EP1509700B1 - Mehrstufige tauchpumpe - Google Patents

Mehrstufige tauchpumpe Download PDF

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Publication number
EP1509700B1
EP1509700B1 EP03727746A EP03727746A EP1509700B1 EP 1509700 B1 EP1509700 B1 EP 1509700B1 EP 03727746 A EP03727746 A EP 03727746A EP 03727746 A EP03727746 A EP 03727746A EP 1509700 B1 EP1509700 B1 EP 1509700B1
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EP
European Patent Office
Prior art keywords
jacket
pump according
stages
intake
stage
Prior art date
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Expired - Lifetime
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EP03727746A
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English (en)
French (fr)
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EP1509700A1 (de
Inventor
Riccardo Fornasa
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Vertical SpA
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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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • F04D29/044—Arrangements for joining or assembling 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
    • F04D29/40—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
    • 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
    • F04D29/4293—Details of fluid inlet or outlet

Definitions

  • the present invention is applicable in the field of electric immersion pumps and relates in particular to a multistage pump according to the preamble of Claim 1.
  • Immersion pumps are generally used to raise liquids from relatively great depths and, therefore, must develop a high head. This objective is achieved by means of pumps having various stages arranged in series. It is known from the state of the art that pumps of this type usually comprise a non-return valve, an element for connection with the motor group, an outer tubular jacket inside which various stages are arranged on top of each other hydraulically in series. Each individual stage comprises at least one impeller and a diffusion duct. The stages, stacked one on top of the other, must be fixed to the jacket and this technical problem may be resolved by means of various measures.
  • the main drawback of this method consists in the high cost as a result of the machining of the threadings and the small dimensional tolerances required. Moreover, the assembling and disassembling steps are laborious and extremely difficult owing to problems of seizure.
  • European patent No. 0267445 describes a multistage pump which is characterized in that the stage assembly is kept in position by means of bearing and centring elements which protrude radially towards the inside of the tubular jacket. These bearing and centring elements engage with a pressing chamber, arranged on the delivery side, and with a locking plate, arranged on the intake side.
  • This solution facilitates the step of assembling the stages and the delivery non-return valve, but has the drawback that the disassembly of the non-return valve leaves the stages free to move axially. It therefore becomes necessary to reposition the stages every time the non-return valve is disassembled.
  • the form of the bearing and centring elements is such that the thrust exerted by the fluid on the non-return valve, upon closing of said valve, is transmitted to the stages, impairing their working life over time.
  • WO-A-01/59303 discloses a multistage pump having all the features defined in the preamble of the attached claim 1.
  • the non-return valve housed in the delivery element cannot be axially extracted from the internal vane of this latter unless the transverse connecting members or screws are unscrewed from the cylindrical body, thus allowing axial shifting of the stages and loss of their axial position.
  • a general object of the present invention is that of eliminating the abovementioned drawbacks by providing a multistage pump which is easy to use and whose manufacture is advantageous from a cost point of view.
  • a main object is that of providing a multistage pump which is easy to assemble and disassemble and is such that the main components and those subject to wear can be easily and quickly replaced.
  • a further object of the invention is that of providing a multistage pump which combines a significant ease of assembly and replacement of the components which have a high mechanical strength.
  • Another particular object of the invention is that of providing a multistage pump which is reliable and is capable of retaining its optimum mechanical and fluid-dynamic characteristics over a long time.
  • a further object is that of providing a multistage pump which offers a good performance and restricts losses in head, particularly of the non-return valve.
  • a multistage pump particularly for submerged pumping devices, which comprises, in accordance with claim 1, an outer tubular jacket defining a longitudinal axis, a plurality of adjacent stages which are slidably inserted inside said tubular jacket, a main shaft which is coaxial with said longitudinal axis, each stage having at least one impeller coupled to said main shaft and a diffusion duct, means for connecting an electric motor to said main shaft, an intake element and a delivery element which are locked axially respectively upstream and downstream of said plurality of stages, wherein said delivery element is removably secured to said jacket close to one longitudinal end thereof by means of substantially transverse connecting members which are accessible from the outside of said jacket, characterised in that also said intake element is removably secured to said jacket close to the other end thereof by means of substantially transverse connecting members which are accessible from the outside of said jacket, said delivery element comprising a tubular portion housing a non-return valve, said tubular portion having an end edge
  • the non-return valve which is positioned close to the delivery side, may be extracted easily from its seat. Disassembly of the valve does not have any effect on the stages stacked up inside the tubular jacket, which remain locked in their correct position. Said characteristic feature means that it is not necessary to reposition the stages inside the tubular jacket after extracting the valve, thereby reducing the time required for replacement of said valve.
  • the thrusts exerted by the fluid on the non-return valve are transmitted to the delivery element and not to the stages, reducing the stresses on said stages.
  • the intake element comprises an intake flange provided with intake openings and removably coupled to an annular interface.
  • the annular interface may be inserted inside the tubular jacket in contact with the last stage of the plurality of stages and is provided with holes for securing it to said jacket.
  • This particular configuration allows the intake flange to be removed, leaving the annular interface attached to the tubular jacket.
  • the clear advantage of this feature lies in the fact that different motors may be mounted on the same pump by means of simple operations, it being merely required to replace the intake flange which connects the motor to the pump and the coupling joint which connects the shafts.
  • a multistage pump according to the invention which is denoted in its entirety by reference number 1 and may be used in particular submerged in fluids containing silt, sand and other suspended materials, is described.
  • the pump 1 comprises an outer tubular jacket 2 defining a longitudinal axis L, a plurality of adjacent stages 3 which are arranged hydraulically in series and inserted slidably inside the tubular jacket 2, and a main shaft 4 which is coaxial with the longitudinal axis L.
  • Each stage 3 comprises an impeller 5 which is keyed onto the main shaft 4 and a diffusion duct 6 which directs the fluid to the mouth of the successive stage and modifies the velocity vector of the fluid in a convenient manner.
  • An intake element 7 and a delivery element 8 are mounted respectively upstream and downstream of the stages 3 so as to lock and prestress them axially. Said intake 7 and delivery elements 8 are secured removably to the tubular jacket 2 close to its longitudinal ends by means of substantially transverse connecting members 9 which may be accessed from the outside of the jacket 2. In this way, it is possible to remove these connecting members 9 directly from the outside, without the need to disassemble other parts first.
  • the transverse connecting members 9 may consist of annular constraining elements 10 which are inserted with a precision-fit into the through-holes 12 and into corresponding holes 13 of the intake element 7 and delivery element 8. These constraining elements 10 are kept in position by means of locking screws 11. Conveniently, said holes are 13 angularly equidistant so that they are uniformly distributed along an outer circumference of the intake element 7 and delivery element 8.
  • the delivery element 8 comprises a tubular portion 14 on which approximately half the holes 13 are positioned and which is secured to the jacket 2 by means of the constraining elements 10 and the locking screws 11.
  • the tubular portion 14 is hollow inside and formed in such a way as to receive inside it a non-return valve 15.
  • the non-return valve 15 is inserted slidably inside the tubular portion 14 in such a way that it may be extracted axially outwards.
  • the tubular portion 14 is provided internally with an internal annular seat 16, against which the non-return valve 15 bears when said valve is inserted completely.
  • the non-return valve 15 When the non-return valve 15 is positioned in this way, it may be locked by means of an elastic locking ring 17 inserted into an annular groove 18 of the tubular portion 14.
  • the lower part of the tubular portion 14 has the function of keeping the stages 3 locked in position, while the central part of this portion has the function of containing the non-return valve 15 so that said valve may be inserted and extracted without coming into contact with the stages 3 and without causing any axial sliding of the stages 3.
  • the intake element 7 comprises an intake flange 19 coupled with an annular interface 20 and a sleeve 21.
  • the annular interface 20 may be inserted inside the tubular jacket 2 and is provided with holes 13 for securing by means of the radial constraining elements 10 and the locking screws 11.
  • the sleeve 21 is placed in between the annular interface 20 and the jacket 2 and is located in contact, at one of its longitudinal ends, with the first stage of the plurality of stages 3 and, at its other end, with the intake flange 19.
  • Openings 22 are formed on the side surface of the sleeve 21, said openings having dimensions such that the constraining elements 10 may pass through the sleeve 21 and that said sleeve may perform a longitudinal displacement of limited amount with respect to the length of the pump 1, even when the constraining elements 10 are inserted.
  • the intake flange 19 comprises intake openings 23 and means 24 for connecting an electric motor (not shown in the drawings). Moreover, this intake flange 19 is secured removably to the annular interface 20 by means of a plurality of axial screws 25 which may be accessed from the outside.
  • the correct axial positioning of the stages 3 is guaranteed by the radial constraining elements 10 and by the annular interface 20 and is independent of the position of the axial screws 25 and of the type and presence or absence of the intake flange 19.
  • the thrust exerted by the intake flange 19 on the stages 3 does not alter the correct positioning of said stages.
  • the intake flange 19 and the motor connected thereto may be removed from the annular interface 20 without disassembling said interface.
  • the stages 3 inserted inside the tubular jacket 2 remain locked even when the intake flange 19 is removed or replaced.
  • optimum prestressing of the stages is automatically restored.
  • the means 24 for connecting the electric motor comprise a contact portion 26 of the intake flange 19, said contact portion being provided with a plurality of axial holes 27 for the passage of connecting screws 28 which may be secured to a counter-flange of the motor (not shown in the drawings).
  • the motor shaft is connected to the main shaft 4 by means of a coupling joint 29.
  • This coupling joint 29 is rigidly connected to the main shaft 4 by means of a key 30 which is kept locked by a dowel pin 31 and may be disassembled and replaced so as to allow coupling with motor shafts of different sizes.
  • Each stage of the plurality 3 comprises a wear ring 32 of the impeller 5 which may be removed manually without the aid of special tools or extractors.
  • the wear ring 32 of each stage is kept in the correct position by means of a circular seat 33 coupled with the diffusion duct 6 and an elastically prestressed element 34 placed in between said stage and the adjacent stage.
  • This elastically prestressed element 34 has a tapered end portion 35 and a linked end portion 36 having two different functions.
  • the joint action of the tapered portion 35, mounted in its correct position, and of the circular seat 33 creates the housing of the wear ring 32.
  • the linked portion 36 is shaped so as to guide the outgoing fluid from the impeller 5 to the respective diffusion duct 6.
  • the wear ring 32 After prolonged operation of the pump 1 in the presence of high concentrations of abrasive substances (sand or silt), the wear ring 32 must be replaced regularly. For this purpose, it is necessary to loosen the axial screws 25, remove the radial constraining elements 10 and the locking screws 11 which pass through the holes 12 of the jacket 2 and disassemble the tubular portion 14. After this operation, it is possible to extract the stack of stages from the jacket 2 and replace the wear rings 32 manually, without using any equipment.
  • abrasive substances sand or silt
  • the pump according to the invention achieves the predetermined objects and particular attention is drawn to the drastic reduction in the time required for replacement of the non-return valve, the intake flange and the wear rings.
  • disassembly of the valve and the intake flange does not have any effect on the stages stacked up inside the tubular jacket, which remain locked in their correct position.
  • motors of different sizes may be mounted on the same pump by means of simple operations, after disassebling and replacing the intake flange and the coupling joint, which connect the pump to the motor.
  • An additional advantage is the improved protection of the inner stages.
  • the transitory mechanical stresses created by water hammers are transmitted from the non-return valve to the delivery element, eliminating any effects on the inner stages. This contrivance safeguards the overall working life of the pump.
  • Another advantage consists in the fact that the maintenance costs of the pump are reduced significantly.
  • the replacement of the worn wear rings may be performed manually, without the need for special tools.
  • the operations of disassembling the stages and replacing the wear rings are made particularly easy and advantageous in terms of cost as a result of the particular characteristic features of the pump according to the invention. In this way, the need to replace the whole group which supports and locks the wear ring is avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (14)

  1. Mehrstufige Pumpe (1), insbesondere mehrstufige Tauchpumpe, mit einer äußeren rohrartigen Ummantelung (2), die eine longitudinale Achse (L) bildet, einer Vielzahl von aneinander liegenden Stufen (3), die gleitend eingesetzt sind innerhalb der Ummantelung (2), einer Hauptwelle (4), die koaxial ist mit der longitudinalen Achse (L), wobei jede Stufe mindestens ein Flügelrad (5) aufweist, das mit der Hauptwelle (4) verbunden ist und einer Diffusionsleitung (6), Einrichtungen (24) zum Verbinden eines elektrischen Motors mit der Hauptwelle (4), einem Einlasselement (7) und einem Abgabeelement (8), die jeweils axial verriegelt sind oberhalb und unterhalb der Vielzahl von Stufen (3), wobei dieses Abgabeelement (8) lösbar gesichert ist an der Ummantelung (2) nahe an einem longitudinalen Ende davon mittels im wesentlichen transversaler Verbindungselemente (9), die von außerhalb der Ummantelung (2) zugänglich sind, dadurch gekennzeichnet, dass auch das Einlasselement (7) lösbar gesichert ist an der Ummantelung (2) nahe an einem anderen Ende davon mittels im wesentlichen transversaler Verbindungselemente (9), die von außerhalb der Ummantelung (2) zugänglich sind, wobei dieses Abgabeelement (8) einen rohrartigen Abschnitt (14) umfasst, der ein Rückschlagventil (15) aufnimmt, wobei dieser rohrartige Abschnitt (14) eine Endkante aufweist, die axial gegen die Stufen (3) drückt, um diese in axialer Stellung relativ zu der rohrartigen Ummantelung (2) zu halten, wobei der rohrartige Abschnitt (14) eine ringförmige Nut (18) aufweist und einen inneren ringförmigen Sitz (16), einen elastischen Verriegelungsring (17), der lösbar aufgenommen ist in der ringförmigen Nut (18), um das Rückschlagventil (15) gegen den inneren ringförmigen Sitz (16) zu zwängen, wobei der zentrale Bereich des rohrartigen Abschnitts (14) so geformt ist, dass das axiale Herausziehen des Rückschlagventils (15) möglich ist nach Entfernen des elastischen Verriegelungsrings (17) aus der ringförmigen Nut (18), wobei die transversalen Verbindungselemente (9) fest gesichert sind an der rohrartigen Ummantelung (2) und so das axiale Gleiten der Stufen (3) verhindern während des Ersetzens des Rückschlagventils (15).
  2. Pumpe gemäß Anspruch 1, dadurch gekennzeichnet, dass die transversalen Verbindungselemente (9) radiale Begrenzungselemente (10) umfassen, die eingesetzt sind mittels einer genauen Passung in Durchgangsbohrungen (12) und in entsprechende Bohrungen (13) in dem Einlasselement (7) und dem Abgabeelement (8) und dort in Stellung gehalten sind jeweils durch Sicherungsschrauben (11).
  3. Pumpe gemäß Anspruch 2, dadurch gekennzeichnet, dass die Bohrungen (13) in dem Einlasselement (7) und dem Abgabeelement (8) im Wesentlichen gleiche Winkelabstände haben.
  4. Pumpe gemäß Anspruch 3, dadurch gekennzeichnet, dass das Einlasselement (7) einen Einlassflansch (19) aufweist, der mit Einlassbohrungen (23) versehen ist, einem ringförmigen Anschluss (20), der in Anlage angeordnet ist zu der letzten Stufe der Vielzahl von Stufen (3) und verbunden ist mit dem Einlassflansch (19) und einer Hülse (21).
  5. Pumpe gemäß Anspruch 4, dadurch gekennzeichnet, dass der ringförmige Anschluss (20) innerhalb der rohrartigen Ummantelung (2) eingesetzt sein kann und mit den Bohrungen (13) versehen ist für genaue Passung der radialen Begrenzungselemente (10).
  6. Pumpe gemäß Anspruch 4, dadurch gekennzeichnet, dass der Einlassflansch (19) lösbar gesichert ist an dem ringförmigen Anschluss (20) mittels einer Vielzahl von axialen Schrauben (25), die von außen zugänglich sind, um es diesen zu ermöglichen, entfernt zu werden während der ringförmige Anschluss (20) zusammen bleibt und die Vielzahl von Stufen (3) axial verriegelt bleiben.
  7. Pumpe gemäß Anspruch 4, dadurch gekennzeichnet, dass eine Hülse (21) angeordnet ist zwischen dem ringförmigen Anschluss (20) und der Ummantelung (2), wobei die Hülse (21) anliegt an einer von seinen longitudinalen Enden mit der ersten Stufe dieser Vielzahl (3) und an seinem anderen Ende mit dem Einlassflansch (19).
  8. Pumpe gemäß Anspruch 7, dadurch gekennzeichnet, dass die Seitenfläche der Hülse (21) Bohrungen (22) aufweist für den Durchlass der Begrenzungselemente (10), wobei die Bohrungen in der Lage sind die longitudinale Verschiebung der Hülse zu ermöglichen, selbst wenn die Begrenzungselemente (10) eingesetzt sind.
  9. Pumpe gemäß Anspruch 1, dadurch gekennzeichnet, dass die Einrichtungen (24) zum Anschließen des elektrischen Motors einen Kontaktbereich (26) des Einlassflansches (19) aufweisen; der mit einer Vielzahl von axialen Bohrungen (27) versehen ist für den Durchlass der Verbindungsschrauben (28), die an einem Gegenflansch des Motors gesichert sein können.
  10. Pumpe gemäß Anspruch 1, dadurch gekennzeichnet, dass die Einrichtungen (24) zum Anschließen des elektrischen Motors ein Kupplungselement (29) umfassen, das steif und lösbar verbunden ist mit der Hauptwelle (4).
  11. Pumpe gemäß Anspruch 10, dadurch gekennzeichnet, dass das Kupplungselement (29) mittels eines Schlüssels (30) mit der Hauptwelle (4) verbunden ist, die derart verriegelt gehalten ist durch einen Passbolzen (31), dass sie zerlegt und ersetzt werden kann, um es so zu ermöglichen, dass Motorwellen mit unterschiedlichen Abmessungen verwendet werden können.
  12. Pumpe gemäß Anspruch 1, dadurch gekennzeichnet, dass jede Stufe der Vielzahl (3) einen Verschleißring (32) des Flügelrads (5) umfasst, das von Hand entfernt werden kann ohne die Hilfe von besonderen Werkzeugen oder Ausziehvorrichtungen.
  13. Pumpe gemäß Anspruch 12, dadurch gekennzeichnet, dass der Verschleißring (32) von jeder Stufe in seiner richtigen Stellung gehalten wird von einem ringförmigen Sitz (33), der verbunden ist mit der Diffusionsleitung (6) und einem elastisch vorgespannten Element (34), das zwischen der Stufe und der nächsten angeordnet ist.
  14. Pumpe gemäß Anspruch 13, dadurch gekennzeichnet, dass das elastisch vorgespannte Element (34) einen geneigten Endabschnitt (35) aufweist, der zusammen mit dem ringförmigen Sitz (33) in axialer Richtung das Gehäuse des Verschleißrings (32) begrenzt und einen zweiten, verbundenen Endabschnitt (36), der passend geformt ist, um die abgehende Flüssigkeit von dem Flügelrad (5) zu der jeweiligen Diffusionsleitung (6) zu führen.
EP03727746A 2002-05-15 2003-05-14 Mehrstufige tauchpumpe Expired - Lifetime EP1509700B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT2002VI000095A ITVI20020095A1 (it) 2002-05-15 2002-05-15 Pompa multistadio particolarmente di tipo ad immersione
ITVI20020095 2002-05-15
PCT/IB2003/001872 WO2003098049A1 (en) 2002-05-15 2003-05-14 Multistage pump, particularly of the immersion type

Publications (2)

Publication Number Publication Date
EP1509700A1 EP1509700A1 (de) 2005-03-02
EP1509700B1 true EP1509700B1 (de) 2011-04-20

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EP (1) EP1509700B1 (de)
CN (1) CN100366914C (de)
AT (1) ATE506541T1 (de)
AU (1) AU2003232947A1 (de)
DE (1) DE60336810D1 (de)
IT (1) ITVI20020095A1 (de)
WO (1) WO2003098049A1 (de)

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ES2318969B1 (es) * 2006-06-16 2010-02-10 Bogemar, S.L. Sistema de anclaje de una envolvente exterior de un cuerpo de bomba centrifuga.
IT1398808B1 (it) * 2010-03-17 2013-03-18 Calpeda A Spa Gruppo motore perfezionato per dispositivi di pompaggio
JP2012118382A (ja) * 2010-12-02 2012-06-21 Panasonic Liquid Crystal Display Co Ltd 液晶表示装置
JP6624962B2 (ja) * 2016-02-10 2019-12-25 株式会社荏原製作所 多段水中ポンプ用の吸込ケーシング、および、多段水中ポンプ
CN110671333B (zh) * 2019-09-29 2021-08-20 华中科技大学 一种用于深海采矿粗颗粒提升的多级泵
CN111963452B (zh) * 2020-08-27 2021-10-26 浙江东音科技有限公司 一种防淤泥堵塞的井用潜水泵
WO2022176092A1 (ja) * 2021-02-18 2022-08-25 三菱重工業株式会社 原油採掘ポンプ
CN114922810B (zh) * 2022-04-22 2024-03-22 浙江理工大学 一种模块化无轴泵及快速更换和运维方法

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Publication number Publication date
ATE506541T1 (de) 2011-05-15
AU2003232947A1 (en) 2003-12-02
CN1653269A (zh) 2005-08-10
CN100366914C (zh) 2008-02-06
EP1509700A1 (de) 2005-03-02
DE60336810D1 (de) 2011-06-01
ITVI20020095A1 (it) 2003-11-17
WO2003098049A1 (en) 2003-11-27

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