EP1729013A1 - Pompe centrifuge submersible - Google Patents

Pompe centrifuge submersible Download PDF

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Publication number
EP1729013A1
EP1729013A1 EP05425396A EP05425396A EP1729013A1 EP 1729013 A1 EP1729013 A1 EP 1729013A1 EP 05425396 A EP05425396 A EP 05425396A EP 05425396 A EP05425396 A EP 05425396A EP 1729013 A1 EP1729013 A1 EP 1729013A1
Authority
EP
European Patent Office
Prior art keywords
pump according
jacket
ring
stage
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.)
Granted
Application number
EP05425396A
Other languages
German (de)
English (en)
Other versions
EP1729013B1 (fr
Inventor
Silvano Pedrollo
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.)
Pedrollo SpA
Original Assignee
Pedrollo SpA
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 Pedrollo SpA filed Critical Pedrollo SpA
Priority to DE602005004016T priority Critical patent/DE602005004016D1/de
Priority to AT05425396T priority patent/ATE382122T1/de
Priority to EP05425396A priority patent/EP1729013B1/fr
Publication of EP1729013A1 publication Critical patent/EP1729013A1/fr
Application granted granted Critical
Publication of EP1729013B1 publication Critical patent/EP1729013B1/fr
Active 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
    • 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
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Definitions

  • the present invention relates to a submersible centrifugal pump.
  • the present invention is applied in the sector of extraction of a liquid, usually water, from a well or a tank.
  • the pumps currently used generally consist of a cylindrical containment jacket inside which there extends a shaft which can be connected to a motor (normally electric), and at least one stage comprising an impeller and a diffuser.
  • a delivery body and an intake body are located respectively downstream and upstream of the jacket with reference to the direction of the fluid pumped.
  • the jacket, the delivery body and the intake body have threads on their side surfaces necessary for fixing these components to one another and clamping the hydraulic stages.
  • a tube is connected to the pump by securely screwing the tube to the delivery body.
  • the delivery body has a non-return valve with the dual purpose of preventing the tube connected to the pump from emptying when the pump is not switched on and of protecting the impellers and the diffusers from possible pressure blowbacks. It is also know that, when pumps operate with a low head, the impellers tend to lift up, carrying the shaft with them. To overcome this disadvantage and, therefore, to prevent the shaft from being subject to excessive axial movements, there are thrust bearing means positioned at the end of the shaft close to the delivery body, so that the resulting forces are discharged mainly on the diffusers.
  • the known type of pumps are unable to guarantee suitable internal stiffness due to the screw connection between the jacket and the delivery and intake bodies.
  • adequate clamping of the stages is impossible, and, either the stages can move relative to one another, damaging pump operation, or they are overtightened, with the risk of damaging internal components.
  • the threads allow significant water leaks, limiting the pump hydraulic seal and reducing its efficiency.
  • the shaft thrust bearing means discharging the forces mainly on the diffusers, may damage the diffusers.
  • the tube connected to the delivery body may become unscrewed either during pump use due to the vibrations produced or due to incorrect revolutions by the motor connected to the pump.
  • the aim of the present invention is therefore to propose a pump which can overcome the above-mentioned disadvantages.
  • the aim of the present invention is to propose a pump which can guarantee optimum compactness of the hydraulic stages and eliminate leaks between the jacket and the intake and delivery bodies.
  • Another aim of the present invention is to provide a pump which allows the elimination of possible damage to the diffusers caused by the thrust bearing means mounted on the shaft and/or facilitates the removal and refitting of the non-return valve.
  • the numeral 1 denotes as a whole a submersible centrifugal pump according to the present invention.
  • the accompanying drawings illustrate a pump with a diameter of approximately 15 cm, or 6 inches.
  • the pump 1 comprises a containment jacket 2, preferably cylindrical, a shaft 3 with a hexagonal cross-section (usually polygonal so that the various components can be keyed to it) extending inside the containment jacket 2 along a longitudinal axis "X", and which can be connected to a motor, for example an electric motor (not illustrated).
  • a motor for example an electric motor (not illustrated).
  • the pump 1 also comprises a delivery body 4 connected to the containment jacket 2 at its outfeed 2b (with reference to the direction in which the fluid flows) and an intake body 5 which supports a first end 3a of the shaft 3, connected to a jacket 2 infeed 2a.
  • outfeed sector 6 designed to support a second end 3b of the shaft 3.
  • the sector 6 consists of a tube 7 in contact with the internal walls of the jacket 2 and a domed structure 8 inside the tube 7 to which it is connected by a plurality of tabs 9.
  • the domed structure 8 houses the second end 3b of the shaft 3.
  • the jacket 2 houses at least one hydraulic stage 10 comprising an impeller 11 keyed to the shaft 3 and a fixed diffuser 12 contained in a supporting tube 13 to which it is attached by tabs 14.
  • the delivery body 4 is a tubular structure located at the jacket 2 outfeed 2b and is connected to the latter by a circumferential weld.
  • a non-return valve 22 smaller than the outfeed pipe 46 so that it can be inserted in the delivery body 4 through said pipe 46.
  • the non-return valve 22 is then held in position by a supporting element 47 removably attached to the delivery body 4.
  • a helical spring acting on the non-return valve to guarantee that it closes with a predetermined force.
  • the supporting element comprises a diffuser 18, having a central hole, which is connected to the delivery body 4 by a plurality of tabs 19 which are connected to a ring nut 20 secured to the delivery body 4 by an elastic stop ring 21 (alternatively, it may be secured by screwing, although this solution is not illustrated).
  • the non-return valve in turn comprises a cylindrical support 23 slidably inserted in the central hole in the diffuser 18, and a closing plate 24 whose centre is fixed to the cylindrical support 23.
  • the plate 24 with the cylindrical support 23 is mobile between an open position, in which the plate 24 is raised and allows the liquid to pass (not illustrated), and a closed position, in which the plate 24 is resting on a projection 25 inside the delivery body 4 ( Figures 2 and 3).
  • Said projection 25 is preferably fitted with a seal 26 which, in the valve 22 closed position, is between the projection 25 and the plate 24, guaranteeing the hydraulic seal.
  • the intake body 5 consists of a tube with, at its first end, a flange 27a needed to connect the pump 1 to a motor and, at its second end, opposite the first, a flange 27b needed to connect the intake body 5 to the jacket 2.
  • the tube also has lateral slits 5a allowing the liquid to enter the pump 1.
  • the intake body 5 is connected to the jacket 2 by clamping means 28 located between the intake body 5 and the jacket 2 which, as well as connecting the two parts, are essential for compressing the hydraulic stages 10 between the intake body 5 and the delivery body 4, thus preventing longitudinal movements by the diffusers 12.
  • Said clamping means 28 comprise at least one screw 29 or one tie rod (not illustrated).
  • a cup-shaped body 32 covers the lower part of each stage 10, and comprises a tubular structure 33 encompassing the impeller 11 and having an upper edge connected to the diffuser 12, and a ring-shaped surface 34 forming the bottom of the cup-shaped body 32.
  • the ring-shaped surface 34 connects, along its inner edge 49, with the relative impeller 11 to guarantee the hydraulic seal.
  • the tubular structure 33 guarantees that the hydraulic stages 10 are contained as a pack in the pump 1, whilst the ring-shaped surface 34 prevents the stages 10 from moving transversally and rotating relative to one another.
  • the ring-shaped surface is modelled in such a way that it has on its base three equidistant circular arc protrusions 35 on the same circle, between them delimiting the three seats 36 designed to hold projections 37, 39 on the upstream element (diffuser 12 or closing ring 38).
  • Two hydraulic stages 10 are connected by placing at least one extension 37 of at least one tab 14 in the seats 36 of the next stage.
  • the first stage 10 is connected to the closing ring 38 at the intake body (in particular between the cup-shaped body 32 of the first stage 10 and the flange 27b of the intake body 5) by positioning three of the ring 38 teeth 39 in the seats 36 in the cup-shaped body 32 of the first stage 10.
  • the outfeed sector 6 also has similar seats 6a delimited by similar protrusions 6b, and designed to receive the extensions 37 of the diffuser 12 of the last stage 10.
  • the seats 36, 6a, the recesses 51, the extensions 37, the teeth 39, 4a, and the small teeth 50 constitute means designed to prevent the delivery body 4, the outfeed sector 6, the stages 10, the closing ring and the intake body 5 from moving transversally and rotating relative to one another. Tightening the screws 29 brings the intake body 5 and the ring-shaped structure closer together and the latter transfers the action exerted by the screws 29 to the jacket 2 thanks to a shear action applied to the elastic stop ring 31. Moreover, the intake body 5 flange 27b pushes the closing ring 38 against the cup-shaped body 32 ( Figure 6) which, by means of its tubular structure 33, transfers the axial action to the relative diffuser, which then transmits it to the subsequent stages as far as the sector 6.
  • the individual parts may be sized in such a way as to guarantee optimum calibrated clamping when the intake body 5 rests against the jacket 2 as illustrated in Figure 6.
  • the pump can be disassembled and reassembled several times without altering the compactness of the stages 10 which is always kept at the ideal level.
  • a hollow coupling 40 with teeth inside (Figure 7) designed to allow connection of the motor shaft (not illustrated) and the pump 1 shaft 3.
  • a thrust bearing washer 41 (advantageously made of anti-friction material) and a support 42 for the washer, both held in place by a metal stop ring 43.
  • These thrust bearing means are inactive and separated from the intake body 5 when the pump 1 operates with a high head ( Figure 7), whilst they rest on the intake body 5 when the pump 1 head is low and the shaft 3 with the impellers 11 is raised. In this way, the thrust bearing means prevent excessive axial movements by both the shaft 3 and the impellers 11.
  • the water infeed is at the intake body 5 and is protected by a filter 44 consisting of a cylindrical surface encompassing the side of the intake body and which has many holes in it. Finally, on the outer surface of the delivery body 4, of the jacket 6 and of the intake body 5 there extends a closed channel 45 which houses the motor power cables.
  • Figures 4 and 5 illustrate an exploded view of several details of an alternative embodiment of the pump 1 with the presence of a single hydraulic stage 10.
  • the delivery body 4, the outfeed sector 6, the diffuser 12, the impeller 11, the cup-shaped structure 32, the ring 38 and the intake body 5 are all visible.
  • Assembly of the pump 1 involves firstly connection of the delivery body 4 to the jacket 2 by welding. Then, all of the internal parts are assembled on the intake body 5 and all inserted together in the jacket 2. At this point the intake body 5 is removed and the ring-shaped structure 30 and relative elastic stop ring 31 are inserted in the jacket. Then the intake body 5 is fitted again and the first end 3a of the shaft 3, with the coupling 40, is inserted in the body 5. Then the screws 29 are positioned and the entire structure is closed, clamping and compressing the hydraulic stages 10. Finally, the thrust bearing washer 41 and the relative ring-shaped support 42 are placed on the coupling 40 and secured with the elastic ring 43.
  • the pump 1 is connected to the tube by screwing together a threaded end of the tube with the sleeve 15 and locking the connection with the grub screw 17a positioned in the opening 17.
  • the non-return valve 22 can be removed by simply removing the supporting element 47, unscrewing the ring nut 20 and taking out the valve 22.
  • the present invention achieves the preset aims and brings important advantages.
  • the advantages of a pump configured in this way are basically linked to the compactness guaranteed by tightening the four screws which push the intake body 5 against the hydraulic stages, holding them firmly against the delivery body 4. This eliminates the diffuser 12 play, preventing possible faulty operations and vibrations. Moreover, where necessary, the clamping can be given a predetermined optimum intensity.
  • special means prevent unwanted relative transversal movements and relative rotations by the pump 1 components, giving the pump 1 a high level of stiffness.
  • the absence of threads on the jacket prevents liquid leaks, avoiding deterioration of pump operation.
  • the connection between the tube and the pump 1 is simply guaranteed by the sleeve 15 thread and the grub screw 17a: this guarantees more simple assembly and does not have a negative affect on the delivery body 4 seal.
  • Another advantage is the simple extraction of the non-return valve 22, which can even be removed by unskilled personnel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Micromachines (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
EP05425396A 2005-05-31 2005-05-31 Pompe centrifuge submersible Active EP1729013B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE602005004016T DE602005004016D1 (de) 2005-05-31 2005-05-31 Zentrifugaltauchpumpe
AT05425396T ATE382122T1 (de) 2005-05-31 2005-05-31 Zentrifugaltauchpumpe
EP05425396A EP1729013B1 (fr) 2005-05-31 2005-05-31 Pompe centrifuge submersible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425396A EP1729013B1 (fr) 2005-05-31 2005-05-31 Pompe centrifuge submersible

Publications (2)

Publication Number Publication Date
EP1729013A1 true EP1729013A1 (fr) 2006-12-06
EP1729013B1 EP1729013B1 (fr) 2007-12-26

Family

ID=34993335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425396A Active EP1729013B1 (fr) 2005-05-31 2005-05-31 Pompe centrifuge submersible

Country Status (3)

Country Link
EP (1) EP1729013B1 (fr)
AT (1) ATE382122T1 (fr)
DE (1) DE602005004016D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20090615A1 (it) * 2009-04-16 2010-10-17 Pedrollo Spa Pompa sommersa con cavi elettrici protetti.
CN106194775A (zh) * 2016-08-25 2016-12-07 中国石油天然气股份有限公司 三元复合驱防垢潜油电泵
WO2018114660A1 (fr) * 2016-12-20 2018-06-28 KSB SE & Co. KGaA Ensemble pompe et réacteur nucléaire équipé d'un tel ensemble pompe
CN110374929A (zh) * 2019-08-28 2019-10-25 浙江大元泵业股份有限公司 深井泵防转导叶串
CN110374929B (zh) * 2019-08-28 2024-05-31 浙江大元泵业股份有限公司 深井泵防转导叶串

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2457365C2 (ru) * 2010-06-16 2012-07-27 Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет Электроцентробежная погружная установка
RU187962U1 (ru) * 2018-12-27 2019-03-26 Общество с ограниченной ответственностью "Русская электротехническая компания" Секция фильтра блочного для погружного центробежного электронасоса

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521970A (en) * 1968-12-30 1970-07-28 Red Jacket Mfg Co Submersible pump
US4523899A (en) * 1982-12-15 1985-06-18 Ebara Corporation Submergible motor pump assembly
EP0267445A2 (fr) * 1986-11-11 1988-05-18 GRUPPO INDUSTRIALE ERCOLE MARELLI S.p.A. Pompe multiétagée pour pompes électriques submersibles
EP0774584A1 (fr) * 1995-11-16 1997-05-21 Itt Flygt Ab Dispositif pour le montage et la fixation des composants d'une unité de pompage submersible

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521970A (en) * 1968-12-30 1970-07-28 Red Jacket Mfg Co Submersible pump
US4523899A (en) * 1982-12-15 1985-06-18 Ebara Corporation Submergible motor pump assembly
EP0267445A2 (fr) * 1986-11-11 1988-05-18 GRUPPO INDUSTRIALE ERCOLE MARELLI S.p.A. Pompe multiétagée pour pompes électriques submersibles
EP0774584A1 (fr) * 1995-11-16 1997-05-21 Itt Flygt Ab Dispositif pour le montage et la fixation des composants d'une unité de pompage submersible

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20090615A1 (it) * 2009-04-16 2010-10-17 Pedrollo Spa Pompa sommersa con cavi elettrici protetti.
WO2010118786A1 (fr) * 2009-04-16 2010-10-21 Pedrollo S.P.A. Pompe immergée avec câbles électriques protégés
CN106194775A (zh) * 2016-08-25 2016-12-07 中国石油天然气股份有限公司 三元复合驱防垢潜油电泵
WO2018114660A1 (fr) * 2016-12-20 2018-06-28 KSB SE & Co. KGaA Ensemble pompe et réacteur nucléaire équipé d'un tel ensemble pompe
CN110374929A (zh) * 2019-08-28 2019-10-25 浙江大元泵业股份有限公司 深井泵防转导叶串
CN110374929B (zh) * 2019-08-28 2024-05-31 浙江大元泵业股份有限公司 深井泵防转导叶串

Also Published As

Publication number Publication date
ATE382122T1 (de) 2008-01-15
DE602005004016D1 (de) 2008-02-07
EP1729013B1 (fr) 2007-12-26

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