EP3290712A1 - Radiale motor-pumpen-einheit - Google Patents

Radiale motor-pumpen-einheit Download PDF

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Publication number
EP3290712A1
EP3290712A1 EP17189555.0A EP17189555A EP3290712A1 EP 3290712 A1 EP3290712 A1 EP 3290712A1 EP 17189555 A EP17189555 A EP 17189555A EP 3290712 A1 EP3290712 A1 EP 3290712A1
Authority
EP
European Patent Office
Prior art keywords
motor pump
casing
opening
centrifugal motor
liquid
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.)
Withdrawn
Application number
EP17189555.0A
Other languages
English (en)
French (fr)
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
Original Assignee
Calpeda 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 Calpeda SpA filed Critical Calpeda SpA
Publication of EP3290712A1 publication Critical patent/EP3290712A1/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft sealings especially adapted for liquid pumps
    • F04D29/108—Shaft sealings especially adapted for liquid pumps the sealing fluid being other than the working liquid or being the working liquid treated

Definitions

  • the present invention concerns a centrifugal motor pump particularly suitable for pumping liquids containing solid impurities and provided with an intermediate chamber which separates the pumping area from the motor area.
  • a centrifugal motor pump of the known type comprises a casing that defines a pumping chamber, wherein said pumping chamber communicates with the outside through an inlet mouth and an outlet mouth.
  • a rotor unit which, when it is set rotating, draws a liquid, generally water, from the outside of the pump through the inlet mouth and conveys it towards the outlet mouth.
  • the rotor unit is set rotating by a motor, through a shaft that projects from the motor casing and passes through a through opening provided in the casing that defines the pumping chamber.
  • a sealing device interposed between the through opening and the shaft avoids leakages of the pumped liquid through the through opening itself.
  • Centrifugal motor pumps are known which are configured in such a way that they can be immersed in the liquid.
  • motor pumps which can be distinguished between “submersible” and “submerged” depending on their use, in any case are structured in such a way as to prevent the pumped liquid from getting into the motor.
  • the motor comprises a chamber which surrounds the shaft and is filled with oil.
  • a mechanical seal arranged in said oil-filled chamber prevents the oil from flowing out of the chamber and the pumped liquid from getting into it.
  • an intermediate chamber which is suited to separate the pumping chamber from the oil-filled chamber.
  • Said intermediate chamber is open towards the external environment, in such a way that the pressure inside it is equal to the external pressure. In this way, the leakages through the mechanical seal of the pumping chamber are discharged outside the motor pump and, therefore, do not affect the operation of the motor.
  • a drawback posed by the embodiment just described above lies in that during the periods of inactivity of the motor pump the intermediate chamber, being open towards the outside, can be filled with sediments present in the surrounding liquid. Said sediments are frequently present especially in the operating conditions of submersible or submerged motor pumps and tend to solidify and form encrustations over time. These encrustations limit the functionality of the intermediate chamber and sometimes may even impair it completely.
  • the motor pump described in the document mentioned above has the limitation that it is not suitable for pumping liquids with solid impurities suspended inside them, since the impurities flow through the drainage duct, thus finding their way into the intermediate chamber, especially during the periods of inactivity of the pump itself.
  • centrifugal motor pump which is suitable for submersion, in particular submersible or submerged, and capable of preventing the pumped liquid from getting into the motor in a more effective way compared to the motor pumps of the known type.
  • the motor pump 1 is particularly suited to be used for lifting water from wells and/or tanks, and also for the circulation of industrial liquids, or for analogous applications.
  • the motor pump 1 comprises a first casing 2 that delimits a pumping chamber 3 which houses a plurality of rotors 12 arranged in series.
  • the first casing 2 is provided with an inlet mouth 4 suited to allow the pumped liquid to flow into the pumping chamber 3 and with an outlet mouth 5 suited to allow the same liquid to flow out of the pumping chamber 3.
  • the rotor 12 is set rotating by a motor 7, enclosed in a second casing 8 which prevents the liquid in which the motor pump 1 is immersed from penetrating in the motor 7.
  • the connection between the rotor 12 and the motor 7 is obtained by means of a shaft 13 which defines a longitudinal axis X.
  • the shaft 13 is arranged through a first through opening 6 provided in the first casing 2, distinct from the inlet mouth 4 and from the outlet mouth 5, and through a second through opening 9 provided in the second casing 8, arranged so that it faces said first through opening 6.
  • first sealing device 18 interposed between the shaft 13 and the first through opening 6, which prevents the pressurized liquid present in the pumping chamber 3 from flowing out through the first through opening 6 during the operation of the motor pump 1.
  • the motor pump 1 comprises also a second sealing device 19 interposed between the shaft 13 and the second through opening 9.
  • the first sealing device 18 and/or the second sealing device 19 comprise a mechanical seal.
  • the second sealing device 19 comprises an oil-filled chamber 24 which separates the second through opening 9 from the motor 7 and which is closed by said second sealing device 19.
  • the oil-filled chamber 24 hinders the penetration of the liquid that should leak through the second sealing device 19 into the motor.
  • the motor pump 1 comprises also a third casing 10, visible in greater detail in Figure 2 , which delimits an intermediate chamber 11 that separates the first through opening 6 provided in the first casing 2 from the second through opening 9 provided in the second casing 8 and places them in communication with each other.
  • Said intermediate chamber 11 houses the section of the shaft 13 included between the two through openings 6 and 9, in such a way that the pumping chamber 3, the intermediate chamber 11 and the space inside the second casing 8 form a single interconnected volume.
  • the intermediate chamber 11 allows the release of the pressurized liquid that leaks through the first through opening 6, preventing the liquid from penetrating in the second casing 8.
  • the third casing 10 is tightly associated with the first casing 2, for example through a welding operation or through any other known means.
  • the third casing 10 can be integral with the first casing 2.
  • the motor pump 1 comprises a recirculation duct 14 developing between a first end 15, which communicates with the intermediate chamber 11, and a second end 16, which communicates with the inlet mouth 4.
  • the recirculation duct 14 allows the liquid present in the intermediate chamber 11 to be conveyed directly into the inlet mouth 4, with no need to open the intermediate chamber 11 towards the outside of the motor pump 1.
  • the intermediate chamber 11 is not provided with openings placing it in direct communication with the environment outside the motor pump 1, which prevents the liquid in which the motor pump 1 is immersed from sedimenting in the intermediate chamber 11 during the periods of inactivity of the motor pump 1.
  • the recirculation duct 14 is oriented downwards, thus preventing the solid impurities from reaching the intermediate chamber 11.
  • the aspect just described above is further improved by directing the second end 16 of the recirculation duct 14 downwards.
  • the motor pump 1 comprises a filtering element 17 positioned upstream of the inlet mouth 4 according to the direction of advance of the liquid flowing through the inlet mouth 4 itself.
  • the filtering element 17 prevents solid impurities from getting into the pumping chamber 3 and, consequently, even into the intermediate chamber 11, thus also preventing the liquid present in the motor pump 1 from sedimenting in the intermediate chamber 11 during the periods of inactivity of the motor pump 1 and further increasing the efficiency of the invention.
  • the second end 16 of the recirculation duct 14 is positioned downstream of the filtering element 17 according to the direction of flow of the liquid through the filtering element 17.
  • the motor pump 1 comprises a tubular jacket 20 which accommodates the first casing 2.
  • the tubular jacket 20 makes it possible to maintain the integrity of the first casing 2 when this is made up of a plurality of elements stacked on top of one another in the axial direction, as in the case of modular multistage motor pumps. In fact, it is possible to maintain said elements compressed on the motor 7 through a thrusting device 26 which rests on conveniently shaped parts 25 of the tubular jacket 20.
  • an intermediate space 21 is obtained between the first casing 2 and the tubular jacket 20, wherein said intermediate space defines a part of the recirculation duct 14.
  • making the recirculation duct 14 in the manner just described above makes it possible to exploit the presence of the tubular jacket 20 to define a part of the recirculation duct 14, with no need to use additional pipes.
  • the tubular jacket 20 and the first casing 2 are both cylindrical and coaxial with the shaft 13.
  • the inner diameter of the tubular jacket 20 is larger than the outer diameter of the first casing 2, in such a way as to define a hollow space which corresponds to said intermediate space 21.
  • an annular element 22 belonging to the thrusting device 26 is interposed between the tubular jacket 20 and the first casing 2 and ensures the mutual centering of the two components, in addition to maintaining the elements compressed as described above.
  • the passage of the liquid from one side of the annular element 22 to the other is ensured by channels 23 obtained between the tubular jacket 20 and the annular element 22.
  • said channels 23 are obtained through corresponding corrugations of the tubular jacket 20 facing the annular element 22.
  • said channels 23 can be obtained also through grooves and/or holes made in the annular element 22.
  • the suction mouth 29 of the motor pump 1 is defined by one end of the tubular jacket 20.
  • the filtering element 17 is associated with said end of the tubular jacket 20.
  • the tubular jacket 20 contains also the motor 7 with the second casing 8, which is preferably cylindrical.
  • the outer diameter of the second casing 8 is smaller than the inner diameter of the tubular jacket 20, in such a way that a hollow space 27 is defined between the two elements, wherein said hollow space at one end communicates with the outlet mouth 5 of the pumping chamber 3 and at the opposite end communicates with the delivery mouth 28 of the motor pump 1.
  • a hollow space 27 is defined between the two elements, wherein said hollow space at one end communicates with the outlet mouth 5 of the pumping chamber 3 and at the opposite end communicates with the delivery mouth 28 of the motor pump 1.
  • the flow of the pumped liquid through said hollow space 27 makes it possible to cool down the motor 7.
  • the fact that the motor 7 and the pumping chamber 3 are both contained in the tubular jacket 20 and that the suction mouth 29 and the delivery mouth 28 correspond to the two ends of the tubular jacket 20 makes the motor pump 1 particularly suitable for use in a well.
  • this is preferably defined by a plurality of holes obtained in the lateral cylindrical surface of the first casing 2 and distributed along its entire circumference, which advantageously allow the pumped liquid to effectively flow from the pumping chamber 3 into the hollow space 27.
  • the tubular jacket 20 comprises a through hole communicating with the intermediate space 21.
  • said through hole allows the intermediate chamber 11 to be washed.
  • Said through hole is particularly useful in applications in which the suction mouth 29, instead of being left open in a well or a tank, is connected to a duct. In this case it may be necessary to separate the intermediate space 21 from the suction area of the motor pump 1, in order to allow the release of any overpressure generated by a closure of the delivery duct, preventing said overpressure from reaching the intermediate chamber 11.
  • said through hole may be connected to a drainage duct whose opposite end is free.
  • Said drainage duct makes it possible to drain the liquid from the intermediate space 21, in such a way as to maintain the functionality of the intermediate chamber 11 unchanged, while at the same time ensuring the release of said overpressure.
  • said through hole can be closed by means of a plug.
  • the rotors 12 draw the liquid in which the motor pump 1 is immersed through the suction mouth 29, the filtering element 17 and the inlet mouth 4, and convey it through the outlet mouth 5, the hollow space 27 and the delivery mouth 28.
  • the intermediate chamber 11 is insulated from the external environment and therefore the solid impurities present in the external environment cannot obstruct the intermediate chamber 11 and/or its outlet towards the outside, thus preserving the functionality of the chamber itself.
  • the presence of the filtering element 17 ensures that all the liquid contained in the motor pump 1 is relatively free of solid impurities. Therefore, the latter impurities cannot cause the obstruction of the intermediate chamber 11, either, thus contributing to better preserve the functionality of the chamber. According to the above, it can be understood that the motor pump described above achieves the object of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Extraction Or Liquid Replacement (AREA)
EP17189555.0A 2016-09-06 2017-09-06 Radiale motor-pumpen-einheit Withdrawn EP3290712A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000089875A IT201600089875A1 (it) 2016-09-06 2016-09-06 Elettropompa centrifuga con camera intermedia, particolarmente adatta al pompaggio di liquidi contenenti impurita’ solide

Publications (1)

Publication Number Publication Date
EP3290712A1 true EP3290712A1 (de) 2018-03-07

Family

ID=58606347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17189555.0A Withdrawn EP3290712A1 (de) 2016-09-06 2017-09-06 Radiale motor-pumpen-einheit

Country Status (2)

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EP (1) EP3290712A1 (de)
IT (1) IT201600089875A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021158118A1 (en) * 2020-02-06 2021-08-12 Waterise As Subsea motor and pump assembly and its use in a subsea desalination plant
IT202000004873A1 (it) * 2020-03-09 2021-09-09 Dab Pumps Spa Supporto perfezionato per cuscinetto per elettropompa ed elettropompa con un simile supporto

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500890A1 (fr) * 1981-02-27 1982-09-03 Klein Schanzlin & Becker Ag Pompe centrifuge
WO2003056185A1 (en) * 2002-01-04 2003-07-10 Bogemar, S.L. Centrifugal pump for hydromassages
EP2916008A1 (de) * 2014-03-07 2015-09-09 CALPEDA S.p.A. Verbesserte elektrische pumpe zum pumpen von flüssigkeiten mit festen verunreinigungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500890A1 (fr) * 1981-02-27 1982-09-03 Klein Schanzlin & Becker Ag Pompe centrifuge
WO2003056185A1 (en) * 2002-01-04 2003-07-10 Bogemar, S.L. Centrifugal pump for hydromassages
EP2916008A1 (de) * 2014-03-07 2015-09-09 CALPEDA S.p.A. Verbesserte elektrische pumpe zum pumpen von flüssigkeiten mit festen verunreinigungen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021158118A1 (en) * 2020-02-06 2021-08-12 Waterise As Subsea motor and pump assembly and its use in a subsea desalination plant
IT202000004873A1 (it) * 2020-03-09 2021-09-09 Dab Pumps Spa Supporto perfezionato per cuscinetto per elettropompa ed elettropompa con un simile supporto
EP3879121A1 (de) * 2020-03-09 2021-09-15 Dab Pumps S.p.A. Träger für ein lager für eine elektrische pumpe und elektrische pumpe mit einem solchen lager

Also Published As

Publication number Publication date
IT201600089875A1 (it) 2018-03-06

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