EP2916008A1 - Verbesserte elektrische pumpe zum pumpen von flüssigkeiten mit festen verunreinigungen - Google Patents

Verbesserte elektrische pumpe zum pumpen von flüssigkeiten mit festen verunreinigungen Download PDF

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Publication number
EP2916008A1
EP2916008A1 EP15158048.7A EP15158048A EP2916008A1 EP 2916008 A1 EP2916008 A1 EP 2916008A1 EP 15158048 A EP15158048 A EP 15158048A EP 2916008 A1 EP2916008 A1 EP 2916008A1
Authority
EP
European Patent Office
Prior art keywords
mouth
electric pump
longitudinal direction
sealing means
interspace
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
EP15158048.7A
Other languages
English (en)
French (fr)
Other versions
EP2916008B1 (de
Inventor
Giuliano Matteazzi
Fiorenzo Zamberlan
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.)
Calpeda SpA
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Calpeda SpA
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Publication date
Application filed by Calpeda SpA filed Critical Calpeda SpA
Publication of EP2916008A1 publication Critical patent/EP2916008A1/de
Application granted granted Critical
Publication of EP2916008B1 publication Critical patent/EP2916008B1/de
Active legal-status Critical Current
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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
    • F04D29/08—Sealings
    • F04D29/086—Sealings 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
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system

Definitions

  • the present invention regards an electric pump particularly suitable for pumping liquids containing solid impurities.
  • Electric pumps of the type comprising a tubular jacket provided with an inlet mouth and an outlet mouth for the liquid to be pumped are known.
  • the tubular jacket encloses a pumping unit for suctioning the liquid from the inlet mouth and conveying it towards the outlet mouth, which has the opposite ends constrained to the tubular jacket so as to prevent the axial movement thereof.
  • the pumping unit is delimited by a tubular casing, in which an electric motor and one or more rotors, mutually connected by means of a shaft, are arranged.
  • the tubular casing is arranged coaxially to the aforementioned tubular jacket and separated therefrom by means of an interspace.
  • tubular casing is provided with a suctioning mouth communicating with the inlet mouth of the tubular jacket and a delivery mouth communicating with the aforementioned interspace.
  • the pumped liquid flows along the interspace and cools the electric motor.
  • the pumping unit is configured so that it can be inserted into the tubular jacket along its longitudinal axis and constrained at the two opposite ends of the tubular jacket, so as to prevent the axial displacement.
  • the aforementioned configuration allows assembling the electric pump.
  • the electric pump comprises sealing means arranged in the interspace, having the function of preventing the liquid exiting from the delivery mouth from returning towards the suctioning mouth along the interspace, thus reducing the efficiency of the electric pump.
  • the aforementioned sealing means are arranged at the end of the tubular casing facing towards the inlet mouth of the tubular jacket, so as to be able to use the element for connecting the tubular casing to the tubular jacket also as a support for the sealing means.
  • the electric pump of the type described above is generally used for suctioning liquids from wells or vats and it is arranged with the inlet mouth facing downwards, so as to be directly submerged in the liquid.
  • the aforementioned electric pump reveals a drawback lying in the fact that, in presence of liquids containing solid impurities, the latter tend to sediment in the interspace area which, during use, is arranged further below, i.e. the area comprised between the delivery mouth of the tubular casing and the aforementioned sealing means.
  • the interspace is filled with the pumped liquid, which is kept in movement by the outflow of the fluid through the delivery mouth of the tubular casing as long as the pumping unit is running.
  • the liquid stops, allowing the sedimentation of the residual impurities in the interspace, the impurities progressively filling the lower area of the interspace.
  • the aforementioned drawbacks are particularly frequent in the typical uses of the electric pumps of the type described above, given that the water suctioned from the wells may contain mud, while the re-circulated industrial liquids, for example oil for machine tools, often contain metal processing residues.
  • the present invention has the object of overcoming the aforementioned drawbacks of the electric pumps of the known type.
  • an object of the present invention is to provide an electric pump of the type described above which may be easily disassembled even after a long period of use in presence of liquids containing solid impurities.
  • an object of the present invention is to prevent the formation of scales deriving from the sedimentation of the impurities.
  • the prevention of the scales prevents both the damaging during the disassembly operations, thus reducing the need of replacing the relative components, and the need of replacing the entire electric pump like in the case of the electric pumps of the prior art.
  • the electric pump of the invention represented, in figure 1 with reference 1 is particularly suitable for pumping liquids containing solid impurities which tend to sediment, thus generating scales.
  • the electric pump 1 is particularly suitable to be used in wells, or for the re-circulation of industrial liquids, or similar applications.
  • the electric pump 1 comprises a tubular jacket 2 developing according to a longitudinal direction X, provided with an inlet mouth 3 and an outlet mouth 4 for the liquid to be pumped.
  • a pumping unit 5, which is delimited by a tubular casing 6 developing according to the longitudinal direction X of the tubular jacket 2 is arranged in said tubular jacket 2.
  • the aforementioned tubular casing 6 is separated from the tubular jacket 2 by means of an interspace 9 and it is provided with a suctioning mouth 7, communicating with the inlet mouth 3 of the tubular jacket 2, and a delivery mouth 8, communicating with the interspace 9.
  • the pumping unit 5 is adapted to pump the liquid from the suctioning mouth 7 towards the delivery mouth 8 and thus from the inlet mouth 3 to the outlet mouth 4 of the tubular jacket 2.
  • the electric pump 1 further comprises sealing means 10 configured so as to prevent the liquid in the interspace 9 from flowing from the delivery mouth 8 towards the suctioning mouth 7.
  • the aforementioned sealing means 10 prevent the pumped liquid from returning towards the suctioning mouth 7 due to the pressure difference, thus causing loss of efficiency of the electric pump 1.
  • the aforementioned sealing means 10 are arranged in the interspace 9, in intermediate position between the suctioning mouth 7 and the delivery mouth 8 of the tubular casing 6.
  • the arrangement of the sealing means 10 described above differs from that of the previously described electric pumps of the known type, wherein the sealing means are arranged at the suctioning mouth of the pumping unit.
  • sealing means 10 arranged as described above limit the width of the lower portion of the interspace 9 where the solid impurities of the pumped liquid may sediment.
  • the electric pump described above attains the object of limiting the formation of scales.
  • the electric pump 1 is particularly suitable for pumping the liquids containing solid impurities.
  • the sealing means 10 are arranged in proximity of the delivery mouth 8, so that the entire area of the interspace 9 communicating with the delivery mouth 8 and adjacent to the sealing means 10 is affected by the flow of the fluid exiting from the delivery mouth 8.
  • the aforementioned sealing means 10 comprise an annular gasket 11, preferably of the "O-ring" type.
  • the aforementioned annular gasket 11 is housed in an annular groove 12 defined on the outer surface of the tubular casing 6.
  • the aforementioned annular groove 12 allows making the position of the annular gasket 11 stable.
  • the tubular jacket 2 internally defines an annular recess 13 arranged in contact with said annular gasket 11.
  • the aforementioned annular recess 13 can be easily obtained by deep-drawing on the tubular jacket 2.
  • the pumping unit 5 is constrained to the tubular jacket 2 by means of connection means 14 which connect each of the opposite ends 23, 24 of the tubular casing 6 to the tubular jacket 2 so as to prevent the displacement of the pumping unit 5 along the longitudinal direction X.
  • connection means 14 are at least partly removable, so as to advantageously allow the slipping off of the pumping unit 5 from the tubular jacket 2 along said longitudinal direction X whenever there arises the need to perform the maintenance operations on the electric pump 1.
  • the aforementioned connection means 14 comprise two abutment rings 25, 26 arranged on the corresponding opposite ends 21, 22 of the tubular jacket 2, which are arranged in contact with the two opposite ends 23, 24 of the tubular casing 6.
  • one of the two abutment rings 25 is rigid, while the other abutment ring 26 is adjustable, for example through screw means, so as to allow adjusting the axial constraint force to which the pumping unit 5 is subjected.
  • variant embodiments of the invention may provide for constraining the pumping unit 5 to the tubular jacket 2 by means of any other constraint means of the known type.
  • the pumping unit 5 comprises a pumping device 15 and a driving device 16 which actuates the pumping device 15, both being housed in the tubular casing 6.
  • the pumping device 15 comprises a mechanical sealing configured to prevent the pumped fluid from flowing towards the driving device 16.
  • the pumping device 15 and the driving device 16 are mutually fixed, for example through screw means, so that they can be slipped off from the tubular jacket 2 as a single body.
  • the driving device 16 comprises a shaft 17 with axis parallel to the aforementioned longitudinal direction X and a motor 18 which drives the shaft 17 in rotation and, preferably, it is electrical.
  • the pumping device 15 preferably it comprises one or more rotors 19 fixed to said shaft 17.
  • the pumping device 15 comprises more than one rotor 19, it comprises a diffuser unit made up of a plurality of stages, each containing a respective rotor 19, stacked on each other according to the longitudinal direction X.
  • Each stage of the diffuser unit comprises a corresponding first cylindrical body, shaped so as to convey the fluid exiting from the respective rotor 19 towards the opening of the rotor 19 of the subsequent stage.
  • the delivery mouth 8 is obtained on a second cylindrical body, stacked on said diffuser unit, which preferably also serves as a support for the aforementioned mechanical sealing.
  • the aforementioned configuration is modular and thus allows obtaining different models of the electric pump, differing from each other due to the number of stages and thus the obtainable prevalence, using a limited number of different components.
  • sealing means 10 are arranged between the aforementioned diffuser unit and the delivery mouth 8, so as to be in a position as close as possible to the latter.
  • the sealing means 10 are associated to the outer surface of the aforementioned second cylindrical body.
  • the pumping device 15 is interposed between the inlet mouth 3 of the tubular jacket 2 and the driving device 16, so as to be arranged at a high position during the operating step.
  • said arrangement allows arranging the inlet mouth 3 of the tubular jacket 2 directly facing the suctioning mouth 7 of the tubular casing 6, to the advantage of pumping efficiency.
  • said arrangement facilitates the electrical connection of the driving device 16.
  • the delivery mouth 8 of the tubular casing 6 it preferably comprises a plurality of holes 20 arranged according to a ring orthogonal to the longitudinal direction X of the tubular jacket 2.
  • the inlet mouth 3 of the tubular jacket 2 is arranged at an end 21 of the tubular jacket 2.
  • the aforementioned configuration is particularly suitable for the use of the electric pump 1 in a well or for suction from a vat, in that it ensures that the inlet mouth 3 is arranged at the lowest point of the electric pump 1 and thus completely submerged in the liquid.
  • the electric pump of the invention attains the object of limiting, or even eliminating, the unwanted effects caused by the sedimentation of the solid impurities contained in the pumped liquid.
  • the particular position of the sealing means is such that the aforementioned impurities are mainly arranged along the path of the pumped liquid and, thus, they are removed from the flow of the liquid.
  • the formation of scales in the interspace is reduced or eliminated and thus the electric pump may be disassembled more easily with respect to the electric pumps of the known type, even after an extended period of operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP15158048.7A 2014-03-07 2015-03-06 Verbesserte elektrische pumpe zum pumpen von flüssigkeiten mit festen verunreinigungen Active EP2916008B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI20140052 2014-03-07

Publications (2)

Publication Number Publication Date
EP2916008A1 true EP2916008A1 (de) 2015-09-09
EP2916008B1 EP2916008B1 (de) 2020-01-08

Family

ID=50487080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15158048.7A Active EP2916008B1 (de) 2014-03-07 2015-03-06 Verbesserte elektrische pumpe zum pumpen von flüssigkeiten mit festen verunreinigungen

Country Status (1)

Country Link
EP (1) EP2916008B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600089875A1 (it) * 2016-09-06 2018-03-06 Calpeda A Spa Elettropompa centrifuga con camera intermedia, particolarmente adatta al pompaggio di liquidi contenenti impurita’ solide
CN109026750A (zh) * 2018-09-11 2018-12-18 上海上涵自动化科技有限公司 一种静音节能水泵
CN109185179A (zh) * 2018-11-27 2019-01-11 中煤科工清洁能源股份有限公司 一种卧式离心煤浆泵
IT202000004876A1 (it) * 2020-03-09 2021-09-09 Dab Pumps Spa Elettropompa con convogliatore di liquido perfezionato

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664398A1 (de) * 1994-01-21 1995-07-26 WILO GmbH Kreiselpumpe mit den Rückfluss verhinderndem Ventil
EP1028255A1 (de) * 1997-09-30 2000-08-16 Ebara Corporation Fluid-turbomaschine
WO2009125363A1 (en) * 2008-04-09 2009-10-15 Pedrollo S.P.A. Centrifugal electric pump
WO2014187648A1 (de) * 2013-05-22 2014-11-27 Grundfos Holding A/S Mehrstufiges selbstansaugendes kreiselpumpenaggregat

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664398A1 (de) * 1994-01-21 1995-07-26 WILO GmbH Kreiselpumpe mit den Rückfluss verhinderndem Ventil
EP1028255A1 (de) * 1997-09-30 2000-08-16 Ebara Corporation Fluid-turbomaschine
WO2009125363A1 (en) * 2008-04-09 2009-10-15 Pedrollo S.P.A. Centrifugal electric pump
WO2014187648A1 (de) * 2013-05-22 2014-11-27 Grundfos Holding A/S Mehrstufiges selbstansaugendes kreiselpumpenaggregat

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600089875A1 (it) * 2016-09-06 2018-03-06 Calpeda A Spa Elettropompa centrifuga con camera intermedia, particolarmente adatta al pompaggio di liquidi contenenti impurita’ solide
EP3290712A1 (de) * 2016-09-06 2018-03-07 CALPEDA S.p.A. Radiale motor-pumpen-einheit
CN109026750A (zh) * 2018-09-11 2018-12-18 上海上涵自动化科技有限公司 一种静音节能水泵
CN109185179A (zh) * 2018-11-27 2019-01-11 中煤科工清洁能源股份有限公司 一种卧式离心煤浆泵
IT202000004876A1 (it) * 2020-03-09 2021-09-09 Dab Pumps Spa Elettropompa con convogliatore di liquido perfezionato

Also Published As

Publication number Publication date
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