EP3123031B1 - Centrifugal pump stage, centrifugal pump and use of a pump - Google Patents

Centrifugal pump stage, centrifugal pump and use of a pump Download PDF

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Publication number
EP3123031B1
EP3123031B1 EP14721501.6A EP14721501A EP3123031B1 EP 3123031 B1 EP3123031 B1 EP 3123031B1 EP 14721501 A EP14721501 A EP 14721501A EP 3123031 B1 EP3123031 B1 EP 3123031B1
Authority
EP
European Patent Office
Prior art keywords
unit
pump
impeller
lid
washer
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.)
Active
Application number
EP14721501.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3123031A1 (en
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
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Filing date
Publication date
Application filed by Pedrollo SpA filed Critical Pedrollo SpA
Publication of EP3123031A1 publication Critical patent/EP3123031A1/en
Application granted granted Critical
Publication of EP3123031B1 publication Critical patent/EP3123031B1/en
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
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • 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
    • 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
    • F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
    • 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
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • 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
    • F04D29/042—Axially shiftable rotors
    • 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
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • 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
    • F04D29/22—Rotors specially for centrifugal 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers 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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/51—Building or constructing in particular ways in a modular way, e.g. using several identical or complementary parts or features

Definitions

  • the present invention concerns a pump stage to be used in a centrifugal pump, in particular of submerged type.
  • pump members are generally used, such as in particular submerged pumps.
  • Known submerged pumps generally have an external tubular sleeve provided with a plurality of radial openings for the entrance of the fluid, usually called aspiration openings, and with an opening for the exit of the liquid, called outlet opening.
  • the operative members of the pump are housed inside the sleeve.
  • the operative members are made up of a pump unit and a motor unit, generally of electric type, suitable to operate the transferring of the liquid from the aspiration openings to the outlet opening.
  • the pump unit is usually made by one or more stages, each comprising a rotating member, suitable to be driven in rotation by the motor shaft of the motor unit, and by stationary members suitable to convey the liquid from a stage to another, until the outlet opening.
  • Patent US 7,290,984 discloses for example a centrifugal pump having more stages, in which each stage comprises an impeller unit, a stationary disc unit and a diffuser unit, arranged about the motor shaft or impeller shaft. More specifically, the disc unit is arranged adjacent to a first side of the impeller unit; the diffuser unit is arranged adjacent to a second side of the impeller unit.
  • the hub of the impeller is provided with floating seal means, supported by the diffuser unit, suitable to reduce the re-circulation of the liquid.
  • a thrust washer arranged about the motor shaft, is suitable to engage the hub of the impeller and the cited seal means of the hub of the impeller.
  • a sliding coupling ring fixed to the stationary disc unit, engages a correspondent surface of the impeller.
  • the seal means of the hub are made up of a circular disc-shaped flange having a series of radial protrusions to couple with correspondent seats shaped on the body of the diffuser, about the passage opening of the shaft.
  • the flange encloses a cup shaped hub portion provided with a circular opening in the transversal part.
  • Patent US 3,265,001 describes a multi-stage centrifugal pump in which the impeller of each stage is supported floating at the relative diffuser unit.
  • the impeller hub is in fact mounted axially slidable on the motor shaft by which it is driven in rotation; the stroke of the floating impeller is limited by suitable stop means, for example of annular shape, mounted on the motor shaft.
  • the impeller is supported in sliding contact, along an annular portion, at the cited lid of the diffuser unit, to make up a seal zone between the rotating part and the static part of the stage. More in particular, the impeller is supported by means of a thrust bearing placed beneath the hub of the same impeller, in support on a seat of the underlying diffuser.
  • the task of the present invention is that of solving the aforementioned problems, by devising a pump stage which ensures a high-level performance as well as long endurance in any functioning condition.
  • Another scope of the present invention is that of providing a pump stage which eases the assembly of the pump unit.
  • a further scope of the invention is that of providing a pump stage having a simple practical and functional conception, provided with a surely reliable functioning, versatile use as well as relative economic cost.
  • the pump stage comprises an impeller unit which is supported floating inside a relative diffuser unit through a shim ring mounted fixed on an axial hub of the impeller unit and sustained in sliding support on a washer housed in fixed position in a correspondent seat of the diffuser unit of an adjacent pump stage.
  • the impeller unit is in sliding contact, along an annular portion extended at said second face, with an aspiration lid associated with said diffuser unit.
  • said play is equal to a few decimillimetres.
  • the impeller unit is in support with said shim ring on said washer of the diffuser unit of the adjacent pump stage and with said annular portion on sad lid.
  • the hydraulic thrust acting on the impeller unit is distributed on two support surfaces, that is the lid on which the impeller annular portion is in support and the adjacent pump stage washer on which the shim ring is in support.
  • the shim ring is protruding for a part from the axial hub of the impeller unit and it axially crosses said lid of the diffuser unit for engaging in sliding support said washer of the diffuser unit of the adjacent pump stage.
  • said washer is housed in a seat made at a circular opening axially made up by said diffuser unit.
  • the shim ring is made of a low friction coefficient material and is sustained in sliding support on a washer of metallic material.
  • the shim ring is made of plastic material, for example a polymer having a low friction coefficient and high endurance without requiring lubrication.
  • said washer is housed in a seat made at a circular opening axially made up by said diffuser unit.
  • the lid comprises a disc of metallic material or partially metallic, centrally having a circular opening with raised rim on which said annular portion of said impeller unit is in sliding contact.
  • the invention also concerns a centrifugal pump comprising a pump unit made up of a plurality of pump stages, as previously described.
  • the width of said clearance progressively reduces because of the wear and tear of said shim ring, until annulling in a normal working condition or speed, in which said annular portion of the impeller unit is in support on said lid.
  • the breaking in of the pump determines a slight wear and tear of the shim ring which in this way is polished and thus acquires a high endurance.
  • the pump stage to be used in a centrifugal pump, in particular of submerged type, known per se and therefore not represented in the drawings, has been indicated for more clarity in its entirety with 1.
  • the pump stage 1 comprises an impeller unit 10 having an axial hub 11, to be associated with a motor shaft of the electric pump, not represented.
  • the impeller 10 is mounted floating inside a correspondent diffuser unit 20, to which an aspiration lid 30 is made integral.
  • the diffuser unit 20 extends at a first face of the impeller unit 10; the lid 30 extends at an opposed second face of the impeller unit. In vertical working position, the first face of the impeller unit 10 is arranged on the top, substantially horizontal, while the second face is arranged inferiorly.
  • the impeller unit 10 is made up of an upper part 12 which extends transversally from the axial hub 11 and a lower part 13 substantially disc shaped.
  • the parts 12, 13 of the impeller unit 10 are preferably made of a plastic material being very rigid and durable, of the type for example of poliossimetilene and the like.
  • the upper part 12 shapes the above mentioned first face of the impeller unit 10; the lower part 13 shapes the above mentioned second face of the impeller unit 10.
  • the upper part 12 of the impeller unit 10 shapes, in angularly distributed positions, a series of walls 14 which extend in spiral shape from the central zone towards the peripheral zone of the impeller unit 10. The walls 14 make up, in cooperation with the lower part 13 of the impeller unit 10, respective flow channels 15 for the liquid to be pumped.
  • the diffuser unit 20 has an external cylindrical body 21, preferably made of plastic rigid material, for example a reinforced thermoplastic material.
  • a profiled plate 22 centrally having a circular opening 23 extends from the top of the cylindrical body 21 towards the inside.
  • a series of keys 24 are shaped in angularly distributed positions, and extend in spiral from the central zone towards the peripheral zone of the diffuser unit 20.
  • the keys 24 shape respective flow channels 25 for the liquid to be pumped.
  • the plate 22 shapes, at the opening 23, a seat 26 for housing a washer 27 preferably of metallic material, for example stainless steel.
  • the washer 27 has an inner diameter smaller than the diameter of the opening 23.
  • the aspiration lid 30 has the shape of a disc centrally having a circular opening 31; the disc 30 is preferably made of metallic or partially metallic material, for example stainless steel. At the opening 31, the disc 30 has a zone curved outwardly suitable to shape a rim 32 raised with respect to the plane of the same disc 30. The disc 30 peripherally engages a correspondent shoulder made along the lower edge of the cylindrical body 21 of the diffuser unit 20.
  • a shim ring 40 is inferiorly associated with the axial hub 11 of the impeller unit 10, suitable to engage, in assembly configuration, the upper face of the washer 27 with thrust bearing functions.
  • the shim ring 40 is fixed to the hub 11. More specifically, the shim ring 40 is inserted in a portion of reduced diameter 16 of the hub 11, to result protruding for a part from the same hub 11.
  • the shim ring 40 is preferably made of plastic material, for example a low friction polymer with great endurance and not requiring lubrication, of the type of polyether-ether-ketone (PEEK).
  • the single pump stages shaping the pump unit are coupled to one another through the insertion in series on the motor member. More in particular, the external cylindrical body 21 of the diffuser unit 20 is inserted at the base of the cylindrical body 21 of the underlying diffuser unit (see figure 3 ). In such configuration, the disc 30, which inferiorly closes the diffuser unit 20, results to be locked against the cylindrical body 21 of the underlying diffuser unit.
  • the impeller unit 10 arranged inside the space shaped between the diffuser unit 20 and the disc 30 of the pump stage, is in support through the shim ring 40 on the washer 27 housed in the corresponding seat 26 of the underlying diffuser unit.
  • the impeller unit 10 of the pump stage is sustained in sliding support on the washer 27 of the diffuser unit 20 of the underlying pump stage.
  • the lower part 13 of the impeller unit 10 is in sliding contact along an annular portion 13a, substantially internal, with the raised rim 32 of the disc 30 inferiorly closing the diffuser unit 20.
  • the impeller unit 10 is supported floating at the relative diffuser unit 20 of the pump stage through the shim ring 40 of low friction plastic material, fixed to the hub 11 and sustained in sliding support on the metal washer 27 fixed in rigid manner on the diffuser unit of the underlying pump stage; the impeller unit is in sliding contact, along an inner annular portion 13a of the inferior disc 13, with the rim 32 of the lid 30 of metallic material of the diffuser unit.
  • the hydraulic thrust acting on the impeller unit 10 is borne by the shim ring 40 sustained in sliding support on the metal washer 27; while between the annular portion 13a of the lower disc 13 of the impeller and the rim 32 of the lid 30 there is a clearance, that is a little play, for example equal to a few decimillimetres, so that the hydraulic losses by leak are minimized, even without there being a contact.
  • the breaking in of the pump determines the occurrence of a slight wear and tear on the shim ring 40, which in this way is polished and consequently acquires a high resistance to wear and tear.
  • the wear out of the shim ring 40 progressively reduces the play between the annular portion 13a of the lower disc 13 of the impeller and the rim 32 of the lid 30, until the lower disc 13 is brought in contact with the rim 32 of the lid 30. In this way, the hydraulic losses by leak are almost completely eliminated between the two seal surfaces, thus improving flow rate and hydraulic head performances.
  • the pump stage according to the present invention attains therefore the scope of ensuring a high performance level in any functioning condition, as well as of easing the assembly of the pump unit.
  • the pump stage according to the present invention allows to improve the pump performances, that is to provide less pump stages while generating the same flow rate.
  • the materials used for the sliding couplings between the impeller 10 and the disc 30 and between the shim ring 40 and the washer 27 allow to minimize the friction effects, while ensuring an efficient seal from liquid passage.
  • Such materials are suitably chosen, also taking into account the possible presence of grains of sand and the like in the liquid.
  • a further advantage offered by the pump stage according to the invention is due to the considerable simplification of the inner seal system and thus to the reduced costs which it entails, also in terms of assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP14721501.6A 2014-03-24 2014-03-24 Centrifugal pump stage, centrifugal pump and use of a pump Active EP3123031B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2014/060106 WO2015145196A1 (en) 2014-03-24 2014-03-24 Centrifugal pump stage, centrifugal pump and use of a pump stage

Publications (2)

Publication Number Publication Date
EP3123031A1 EP3123031A1 (en) 2017-02-01
EP3123031B1 true EP3123031B1 (en) 2018-12-12

Family

ID=50639813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14721501.6A Active EP3123031B1 (en) 2014-03-24 2014-03-24 Centrifugal pump stage, centrifugal pump and use of a pump

Country Status (7)

Country Link
US (1) US20170107990A1 (es)
EP (1) EP3123031B1 (es)
CN (1) CN106133325A (es)
ES (1) ES2714830T3 (es)
MX (1) MX2016012266A (es)
RU (1) RU2662848C2 (es)
WO (1) WO2015145196A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100030575A1 (it) * 2021-12-02 2023-06-02 Pedrollo Spa Stadio di pompa centrifuga, pompa centrifuga e uso di uno stadio di pompa

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CN109838386A (zh) * 2017-11-24 2019-06-04 台州阳春机电有限公司 一种高效离心泵
CN109838411A (zh) * 2017-11-24 2019-06-04 台州阳春机电有限公司 一种用于离心泵的叶轮片
DK3530948T3 (da) 2018-02-23 2024-04-15 Sulzer Management Ag Flertrinscentrifugalkværnepumpe

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CN203430807U (zh) * 2013-09-09 2014-02-12 浙江大福泵业有限公司 抗沙型深井潜水电泵

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100030575A1 (it) * 2021-12-02 2023-06-02 Pedrollo Spa Stadio di pompa centrifuga, pompa centrifuga e uso di uno stadio di pompa

Also Published As

Publication number Publication date
ES2714830T3 (es) 2019-05-30
CN106133325A (zh) 2016-11-16
EP3123031A1 (en) 2017-02-01
US20170107990A1 (en) 2017-04-20
WO2015145196A1 (en) 2015-10-01
RU2016141422A (ru) 2018-04-24
RU2662848C2 (ru) 2018-07-31
MX2016012266A (es) 2017-01-06

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