EP2916008B1 - 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
EP2916008B1
EP2916008B1 EP15158048.7A EP15158048A EP2916008B1 EP 2916008 B1 EP2916008 B1 EP 2916008B1 EP 15158048 A EP15158048 A EP 15158048A EP 2916008 B1 EP2916008 B1 EP 2916008B1
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EP
European Patent Office
Prior art keywords
electric pump
mouth
longitudinal direction
sealing means
tubular jacket
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Application number
EP15158048.7A
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English (en)
French (fr)
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EP2916008A1 (de
Inventor
Giuliano Matteazzi
Fiorenzo Zamberlan
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Calpeda SpA
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Calpeda SpA
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    • 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)

Claims (13)

  1. Elektrische Pumpe (1) des Typs, der Folgendes umfasst:
    - eine röhrenförmige Umhüllung (2), die sich entlang einer Längsrichtung (X) entwickelt, mit einer Einlassöffnung (3) und einer Auslassöffnung (4) für den Durchfluss einer Flüssigkeit versehen;
    - eine in der besagten röhrenförmigen Umhüllung (2) angeordnete Pumpeinheit (5), begrenzt durch ein röhrenförmiges Gehäuse (6), das sich entlang der besagten Längsrichtung (X) entwickelt und von der besagten röhrenförmigen Umhüllung (2) mittels eines Zwischenraums (9) getrennt ist, wobei das besagte röhrenförmige Gehäuse (6) mit einer Ansaugöffnung (7) versehen ist, die mit der besagten Einlassöffnung (3) kommuniziert, und mit einer Ausgabeöffnung (8), die mit dem besagten Zwischenraum (9) kommuniziert, wobei die besagte Pumpeinheit (5) dazu geeignet ist, die besagte Flüssigkeit aus der besagten Ansaugöffnung (7) zu der besagten Ausgabeöffnung (8) zu pumpen;
    - Versiegelungsmittel (10), die dazu konfiguriert sind, zu verhindern, dass die besagte Flüssigkeit den besagten Zwischenraum (9) entlang von der besagten Ausgabeöffnung (8) zu der besagten Ansaugöffnung (7) fließt, wobei die besagten Versiegelungsmittel (10) in dem besagten Zwischenraum (9) angeordnet sind, in mittlerer Position zwischen der besagten Ansaugöffnung (7) und der besagten Ausgabeöffnung (8);
    wobei die besagte Pumpeinheit (5) eine Pumpvorrichtung (15) und eine Antriebsvorrichtung (16) zum Antrieb der besagten Pumpvorrichtung (15) umfasst, die beide in dem besagten röhrenförmigen Gehäuse (6) angeordnet sind;
    wobei die besagte Antriebsvorrichtung (16) eine Welle (17) umfasst, deren Achse parallel zu der besagten Längsrichtung (X) steht, und einen Motor (18), um die besagte Welle (17) in Drehung zu versetzen;
    wobei die besagte Pumpvorrichtung (15) eine Diffusoreinheit umfasst, die aus einer Vielzahl von in der besagten Längsrichtung (X) aufeinander gestapelten Stufen besteht, von denen jede einen entsprechenden, an der besagten Welle (17) befestigten Rotor (19) enthält;
    dadurch gekennzeichnet, dass die besagten Versiegelungsmittel (10) die besagte Längsrichtung (X) entlang zwischen der besagten Diffusoreinheit und der besagten Ausgabeöffnung (8) angeordnet sind.
  2. Elektrische Pumpe (1) nach Patentanspruch 1, dadurch gekennzeichnet, dass die besagte Ausgabeöffnung (8) in einem zylindrischen Körper gewonnen ist, welcher auf der besagten Diffusoreinheit gestapelt ist, und dadurch, dass die besagten Versiegelungsmittel (10) mit der Außenfläche des besagten zylindrischen Körpers verbunden sind.
  3. Elektrische Pumpe (1) nach Patentanspruch 2, dadurch gekennzeichnet, dass sie eine mechanische Dichtung umfasst, die durch den besagten zylindrischen Körper gehalten wird.
  4. Elektrische Pumpe (1) nach einem jeden der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass die besagten Versiegelungsmittel (10) in der Nähe der besagten Ausgabeöffnung (8) angeordnet sind, so dass der gesamte Bereich des besagten Zwischenraums (9), der mit der besagten Ausgabeöffnung (8) kommuniziert und an die besagten Versiegelungsmittel (10) angrenzt, von dem Fluss der besagten, aus der besagten Ausgabeöffnung (8) ausfließenden Flüssigkeit erfasst wird.
  5. Elektrische Pumpe (1) nach Patentanspruch 4, dadurch gekennzeichnet, dass die besagten Versiegelungsmittel (10) eine ringförmige Dichtung (11) umfassen.
  6. Elektrische Pumpe (1) nach Patentanspruch 5, dadurch gekennzeichnet, dass das besagte röhrenförmige Gehäuse (6) außen eine ringförmige Rille (12) definiert, die geeignet ist, die besagte ringförmige Dichtung (11) aufzunehmen.
  7. Elektrische Pumpe (1) nach einem jeden der Patentansprüche 5 oder 6, dadurch gekennzeichnet, dass die besagte röhrenförmige Umhüllung (2) innen eine ringförmige Vertiefung (13) definiert, die in Kontakt mit der besagten ringförmigen Dichtung (11) angeordnet ist.
  8. Elektrische Pumpe (1) nach einem jeden der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass sie Verbindungsmittel (14) zur Verbindung jedes entgegengesetzten Endes (23, 24) des besagten röhrenförmigen Gehäuses (6) mit der besagten röhrenförmigen Umhüllung (2) aufweist, um die Verschiebung der besagten Pumpeinheit (5) entlang der besagten Längsrichtung (X) zu verhindern.
  9. Elektrische Pumpe (1) nach Patentanspruch 8, dadurch gekennzeichnet, dass die besagten Verbindungsmittel (14) wenigstens teilweise abnehmbar sind, um das Ausfahren der besagten Pumpeinheit (5) aus der besagten röhrenförmigen Umhüllung (2) entlang der besagten Längsrichtung (X) zu erlauben.
  10. Elektrische Pumpe (1) nach einem jeden der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass die besagte Antriebsvorrichtung (16) eine Welle (17) umfasst, deren Achse parallel zu der besagten Längsrichtung (X) steht, und einen Motor (18), der dazu geeignet ist, die besagte Welle (17) in Drehung zu versetzen, wobei die besagte Pumpvorrichtung (15) einen oder mehrere an der besagten Welle (17) befestigte(n) Rotor(en) (19) umfasst.
  11. Elektrische Pumpe (1) nach einem jeden der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass die besagte Pumpvorrichtung (15) zwischen der besagten Einlassöffnung (3) und der besagten Antriebsvorrichtung (16) eingefügt ist.
  12. Elektrische Pumpe (1) nach einem jeden der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass die besagte Ausgabeöffnung (8) eine Vielzahl von Bohrungen (20) umfasst, die einem orthogonal zu der besagten Längsrichtung (X) stehenden Ring entsprechend angeordnet sind.
  13. Elektrische Pumpe (1) nach einem jeden der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass die besagte Einlassöffnung (3) an einem Ende (21) der besagten röhrenförmigen Umhüllung (2) angeordnet ist.
EP15158048.7A 2014-03-07 2015-03-06 Verbesserte elektrische pumpe zum pumpen von flüssigkeiten mit festen verunreinigungen Active EP2916008B1 (de)

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ITVI20140052 2014-03-07

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EP2916008B1 true EP2916008B1 (de) 2020-01-08

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Families Citing this family (4)

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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

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Publication number Priority date Publication date Assignee Title
DE4401658A1 (de) * 1994-01-21 1995-07-27 Wilo Gmbh Kreiselpumpe mit den Rückfluß verhinderndem Ventil
JP3352924B2 (ja) * 1997-09-30 2002-12-03 株式会社荏原製作所 流体機械
ITBO20080219A1 (it) * 2008-04-09 2009-10-10 Pedrollo Spa Elettropompa centrifuga
CN105229309B (zh) * 2013-05-22 2019-03-01 格兰富控股联合股份公司 多级自吸离心泵机组

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