EP3271587B1 - Impeller for centrifugal pumps - Google Patents

Impeller for centrifugal pumps Download PDF

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Publication number
EP3271587B1
EP3271587B1 EP16768970.2A EP16768970A EP3271587B1 EP 3271587 B1 EP3271587 B1 EP 3271587B1 EP 16768970 A EP16768970 A EP 16768970A EP 3271587 B1 EP3271587 B1 EP 3271587B1
Authority
EP
European Patent Office
Prior art keywords
impeller
disk element
profile
contoured
rotation axis
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
EP16768970.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3271587A4 (en
EP3271587A1 (en
Inventor
Renato GROPPO
Fabio BALBO
Mariano MATTEAZZI
Masashi Obuchi
Dai SAKIHAMA
So Kuroiwa
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.)
Ebara Corp
Original Assignee
Ebara Corp
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Filing date
Publication date
Application filed by Ebara Corp filed Critical Ebara Corp
Publication of EP3271587A1 publication Critical patent/EP3271587A1/en
Publication of EP3271587A4 publication Critical patent/EP3271587A4/en
Application granted granted Critical
Publication of EP3271587B1 publication Critical patent/EP3271587B1/en
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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
    • F04D29/18—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
    • 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • 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
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/051—Axial thrust balancing
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/287—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps with adjusting means
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps

Definitions

  • the present invention relates to an impeller for centrifugal pumps, particularly of the type with one or more stages.
  • a centrifugal pumps has an impeller conventionally made of a pair of shaped disk bodies facing each other so as to form a gap within which a series of vanes that connect the two disks are arranged.
  • each impeller Centrally to each impeller there is a hub, or an equivalent coupling device, that allows to fasten the impeller to a transmission shaft that is turned by a motor means.
  • impellers of the known type are widely used, they have drawbacks; among these, perhaps the most important is linked to the generation of axial thrusts.
  • the impeller of a centrifugal pump is in fact subjected to different pressures that act on the two faces: a pressure lower than the atmospheric pressure generally acts on the inlet side, while a pressure substantially equal to the delivery pressure acts on the opposite face. This produces an axial thrust which can even be considerable, such as to create great losses in terms of efficiency and overloads that damage the bearings of the motor.
  • the prior art also includes an impeller for centrifugal pumps disclosed in the Italian patent application no. ITVI2014A000271 , to this same applicant.
  • Such impeller effectively solves the problems described above, but requires the provision of disk elements having different diameters.
  • JP S54 072 501 A that describes a centrifugal, mixed flow pump that has a communicating slit on the periphery of a rear disc to introduce pressure water from outside to the inside of an impeller.
  • Holes arranged in a hub disc along the trailing sides of rotor blades of an impeller are known from US3944406 A , US3541607 A , FR526862 , WO2010/110937 .
  • the aim of the invention is to solve the problems described above, providing a impeller for centrifugal pumps that allows to reduce axial thrusts, at the same time ensuring maximum efficiency, and provides for the use of disk elements with the same diameter.
  • a particular object of the invention is to provide an impeller that allows to solve the problems linked to the traction that is usually generated on the transmission shaft.
  • Another object of the invention is to provide an impeller that allows to preserve the bearings of the motor.
  • Another object of the invention is to provide an impeller that can be manufactured with a small number of components and is therefore advantageous also from a purely economic standpoint.
  • the impeller inter alia comprises a first disk element, functionally arranged toward the inlet, which is coaxial to and faces a second disk element, which is functionally arranged toward the delivery; said second disk element being connected rigidly to said first disk element by angularly spaced vanes and being centrally provided with a fastening means for fastening to a transmission shaft; said impeller comprising specifically shaped and/or arranged openings formed iri the substantially peripheral region of said second disk element, between pairs of adjacent vanes, substantially at the areas subjected to the greatest axial thrust.
  • the centrifugal pump comprises a substantially hollow body that accommodates at least one impeller according to claim 1 that is fastened to a transmission shaft which can be rotated about a rotation axis by a motor means.
  • the impeller according to the invention allows to considerably reduce the axial thrusts but at the same time ensure maximum efficiency and head.
  • the impeller according to the present invention allows to solve the problems linked to the traction that is usually generated on the transmission shaft of centrifugal pumps with one or more stages. This allows, for example, to avoid damage to the bearings of the motor.
  • FIGS 1 to 3 illustrate an impeller for a centrifugal pumps, globally designated by the reference numeral 1.
  • impeller 1 is used in a multistage centrifugal pump; however, it is evident to the person skilled in the art that the impeller according to the present invention can also be fitted on pumps of another type, like single stage centrifugal pump.
  • the multistage centrifugal pump which is per se known and is not shown in the figures, is constituted by a substantially hollow body that accommodates a set of impellers provided according to the present invention, which are coaxially fastened to a transmission shaft that is turned by a motor means.
  • the impeller 1 includes a first disk element 2, which is functionally arranged towards the inlet, and a second disk element 3, which is functionally arranged towards the delivery.
  • the diameter of the second disk element 3 is substantially equal to, or slightly smaller than, the diameter of the first disk element 2.
  • the two disk elements 2 and 3 are coaxial to a rotation axis 1000 and face each other so as to form a substantially cylindrical interspace.
  • Vanes 4 are arranged within the interspace and rigidly connect the first disk element 2 to the second disk element 3.
  • the vanes 4 are curved so as to form ducts that diverge and are arranged radially.
  • the second disk element 3 is fastened to a transmission shaft by means of a fastening means.
  • the transmission shaft which is not shown in the figures, rotates about the rotation axis 1000.
  • the fastening means comprises a hub 5, which can be associated mechanically with the transmission shaft, provided at the center of the second disk element 3.
  • a through hole 6 is centrally provided on the first disk element 2, opposite to the hub 5; the through hole 6 has a diameter that is larger than that of the transmission shaft.
  • the through hole 6 is connected to a collar 7 that protrudes from the first disk element 2.
  • the collar 7 surrounds the shaft, forming an annular opening that constitutes the intake of the impeller.
  • the impeller 1 includes a series of openings formed in the substantially peripheral region of the second disk element 3, between pairs of adjacent vanes 4, in which it is possible to identify the areas of the disk that are subject to the greatest axial thrust.
  • each opening extends for a distance that is shorter than that of the peripheral edge of the second disk element 3, with respect to the rotation axis 1000.
  • the openings are completely included within the profile of the second disk element 3.
  • the openings are constituted by shaped slots 8 provided in the peripheral region of the second disk element 3, between pairs of adjacent vanes 4.
  • Each contoured slot 8 has an arc-like profile 9, at the radially peripheral side; the arc-like profile 9 has a convexity facing the rotation axis 1000.
  • the arc-like profile 9 is connected with an opposite contoured profile 10, which, in the example shown in Figures 1 to 3 , has a curved portion, with the convexity facing the rotation axis 1000.
  • FIGs 4 to 6 show an impeller, generally designated by the reference numeral 101, which is similar to the impeller 1 but is provided with contoured profiles 110 with the convexity facing the outside of the second disk element 3.
  • the impeller according to the invention is generally designated by the reference numeral 201
  • the arc-like profiles 9 and the contoured profiles 10, of the contoured slots 8 are joined by one or more radially extended tabs 211 that have the function of stiffening the structure.
  • the openings are constituted by through holes 308 provided in the substantially peripheral region of the second disk element 3, between pairs of adjacent vanes 4.
  • the centers of the through holes 308 are arranged substantially along an arc of a circumference that is centered on the rotation axis 1000; however, it is evident to the person skilled in the art that the through holes might be arranged in other equivalent manners.
  • figures 13 to 15 show an impeller, designated by the reference numeral 401, which is similar to the impeller 301 but has through holes 408 that are formed substantially along multiple arcs which are concentric and centered with respect to the rotation axis 1000.
  • Figures 16 to 18 show an impeller, generally designated by the reference numeral 501, which includes through holes 508 provided in the second disk element 3, between pairs of adjacent vanes 4, and arranged substantially along arcs of a circumference the center of which is arranged outside the disk.
  • the impeller according to the invention may be manufactured by means of various techniques, by using metallic materials such as, for example, steel, stainless steel, die-cast steel, cast iron, brass, and the like, or other materials provided with the necessary technological characteristics, such as for example some techno-polymers.
  • the impeller according to the present invention therefore allows to solve the problems linked to the traction that is usually generated on the transmission shaft of centrifugal pumps with one or more stages. This allows, for example, to avoid damage to the bearings of the motor.
  • the materials used may be any according to the requirements of the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP16768970.2A 2015-03-20 2016-03-18 Impeller for centrifugal pumps Active EP3271587B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI20150081 2015-03-20
PCT/JP2016/059789 WO2016153068A1 (en) 2015-03-20 2016-03-18 Impeller for centrifugal pumps

Publications (3)

Publication Number Publication Date
EP3271587A1 EP3271587A1 (en) 2018-01-24
EP3271587A4 EP3271587A4 (en) 2018-10-17
EP3271587B1 true EP3271587B1 (en) 2023-07-12

Family

ID=53177841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16768970.2A Active EP3271587B1 (en) 2015-03-20 2016-03-18 Impeller for centrifugal pumps

Country Status (12)

Country Link
US (1) US20180045213A1 (ru)
EP (1) EP3271587B1 (ru)
JP (1) JP6676651B2 (ru)
KR (1) KR102491363B1 (ru)
CN (1) CN107429706A (ru)
BR (1) BR112017020084B1 (ru)
DK (1) DK3271587T3 (ru)
ES (1) ES2954939T3 (ru)
MY (1) MY193271A (ru)
RU (1) RU2709404C2 (ru)
TW (1) TWI725016B (ru)
WO (1) WO2016153068A1 (ru)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20150308A1 (it) 2015-05-04 2016-11-04 Ebara Corp Struttura di girante, particolarmente per pompe centrifughe
CN106907348B (zh) * 2015-12-23 2021-04-09 德昌电机(深圳)有限公司 叶轮及使用该叶轮的泵
EP3324052A1 (en) * 2016-11-18 2018-05-23 Sogefi Air & Cooling (SAS) Impeller for a fluid pump
WO2023274991A1 (en) 2021-07-02 2023-01-05 Koninklijke Philips N.V. Impeller for used in a fan and a fan

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR526862A (fr) * 1919-11-11 1921-10-15 Walter Hayhurst Perfectionnements aux pompes centrifuges
WO2010110937A1 (en) * 2009-03-25 2010-09-30 Woodward Governor Company Centrifugal impeller with controlled force balance

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US958612A (en) * 1907-08-12 1910-05-17 Wilhelm Heinrich Eyermann Means for balancing turbines and pumps.
US1473802A (en) * 1921-10-26 1923-11-13 Superior Mfg Company Centrifugal pump with self-centering runner
US1634317A (en) * 1925-07-22 1927-07-05 Worthington Pump & Mach Corp Impeller balancing and sealing device
US1871747A (en) * 1929-07-05 1932-08-16 Dempster Mill Mfg Company Impeller for centrifugal pumps
US2276077A (en) * 1941-05-09 1942-03-10 Duriron Co Pump impeller
US2658455A (en) * 1948-02-26 1953-11-10 Laval Steam Turbine Co Impeller with center intake
US2761393A (en) * 1950-05-19 1956-09-04 Thompson Prod Inc Submerged booster pump assembly
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US3652186A (en) * 1970-05-25 1972-03-28 Carter Co J C Pressure lubricated, cooled and thrust balanced pump and motor unit
US3944406A (en) * 1973-12-20 1976-03-16 Veb Chemieanlagenbau-Und Montagekombinat Centrifugal pump for pumping liquids with heavy gas content
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JPS5472501A (en) * 1977-11-21 1979-06-11 Hitachi Ltd Axial thrust reducing method for centrifugal, mixed flow pump
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JP4426776B2 (ja) * 2003-04-25 2010-03-03 株式会社やまびこ 送風用遠心羽根車
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CN102322443A (zh) * 2011-09-08 2012-01-18 浙江工业大学 轴向力平衡的单级离心泵
CN103062111B (zh) * 2012-10-09 2016-06-29 宁波风机有限公司 一种风机叶轮
JP5472501B2 (ja) 2013-02-22 2014-04-16 大日本印刷株式会社 セキュリティ用封筒
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RU188224U1 (ru) * 2018-08-27 2019-04-03 ОБЩЕСТВО С ОГРАНИЧЕННОЙ ОТВЕТСТВЕННОСТЬЮ "ЛУКОЙЛ ЭПУ Сервис" Ступень погружного многоступенчатого лопастного насоса

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR526862A (fr) * 1919-11-11 1921-10-15 Walter Hayhurst Perfectionnements aux pompes centrifuges
WO2010110937A1 (en) * 2009-03-25 2010-09-30 Woodward Governor Company Centrifugal impeller with controlled force balance

Also Published As

Publication number Publication date
ES2954939T3 (es) 2023-11-27
TWI725016B (zh) 2021-04-21
KR102491363B1 (ko) 2023-01-26
JP6676651B2 (ja) 2020-04-08
KR20170129822A (ko) 2017-11-27
US20180045213A1 (en) 2018-02-15
RU2017135417A (ru) 2019-04-09
CN107429706A (zh) 2017-12-01
TW201638475A (zh) 2016-11-01
RU2709404C2 (ru) 2019-12-17
EP3271587A4 (en) 2018-10-17
BR112017020084A2 (pt) 2019-05-14
WO2016153068A1 (en) 2016-09-29
MY193271A (en) 2022-09-29
DK3271587T3 (da) 2023-09-11
EP3271587A1 (en) 2018-01-24
JP2018508701A (ja) 2018-03-29
BR112017020084B1 (pt) 2023-03-14
RU2017135417A3 (ru) 2019-07-17

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