EP2060791A1 - Pompe électrique centrifuge avec aspiration axiale - Google Patents

Pompe électrique centrifuge avec aspiration axiale Download PDF

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Publication number
EP2060791A1
EP2060791A1 EP07425715A EP07425715A EP2060791A1 EP 2060791 A1 EP2060791 A1 EP 2060791A1 EP 07425715 A EP07425715 A EP 07425715A EP 07425715 A EP07425715 A EP 07425715A EP 2060791 A1 EP2060791 A1 EP 2060791A1
Authority
EP
European Patent Office
Prior art keywords
axis
electric pump
rotation
distance
plane
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Withdrawn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
EP07425715A
Other languages
German (de)
English (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
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 Pedrollo SpA filed Critical Pedrollo SpA
Priority to EP07425715A priority Critical patent/EP2060791A1/fr
Publication of EP2060791A1 publication Critical patent/EP2060791A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps 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
    • 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
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4293—Details of fluid inlet or outlet

Definitions

  • the present invention relates to centrifugal electric pumps with axial suction, and in particular centrifugal electric pumps with nominal deliveries of less than 350 m 3 /h and nominal heads of less than 100 m.
  • centrifugal electric pumps with axial suction of the above-mentioned type are known and marketed.
  • the technical purpose which forms the basis of the present invention is to provide centrifugal electric pumps with axial suction which are an improvement on prior art centrifugal electric pumps.
  • the technical purpose of the present invention is to provide centrifugal electric pumps with axial suction which, the nominal performance being equal, allow the achievement of greater efficiency and quietness than the corresponding conventional electric pumps.
  • the present invention also has for a technical purpose to provide centrifugal electric pumps with axial suction which, the external dimensions being equal to those of prior art electric pumps, allow higher nominal performance and wider performance curves, thus allowing manufacturers to cover a predetermined range of pumps with a lower number of models than is currently the case.
  • the numeral 1 denotes as a whole a centrifugal electric pump with axial suction made in accordance with the present invention.
  • a centrifugal electric pump with axial suction comprises a pump casing 2 having a base 3, a suction opening 4 and a delivery opening 5, in which an impeller 6 is inserted, having an axis of rotation X.
  • Both the suction opening 4 and the delivery opening 5 preferably have a circular cross-section.
  • An electric motor 7 is fixed to the pump casing 2 on the opposite side to the suction opening 4.
  • the motor shaft (not illustrated) is operatively connected to a main shaft 8 on which the impeller 6 is mounted.
  • the axis of the main shaft 8 therefore corresponds with the impeller 6 axis of rotation X.
  • the base 3 of the pump casing 2 has two supporting feet 9 whose lower supporting surfaces, together with a third foot 9 integral with the electric motor 7, form a supporting plane 10 substantially parallel with the axis of rotation X.
  • the supporting plane 10 is usually horizontal.
  • the suction opening 4 is coaxial with the impeller 6 and is fitted with a first annular connecting flange 11 which has a first flat annular connecting surface 12.
  • the first flat surface 12, which lies in a first connecting plane 13 substantially perpendicular to the axis of rotation X, can be connected, in practice, to a suction pipe (not illustrated).
  • the first annular flange 11 has several first through-holes 14 through which it is possible to insert the fixing bolts 15 of a first threaded fixing plate 16 which can be joined to the suction pipe ( Figure 1 ).
  • the delivery opening 5 is centred on its own central axis 17 parallel with the first connecting plane 13. It is also fitted with a second annular connecting flange 18 which has a second flat annular connecting surface 19.
  • the second flat annular surface 19 lies in a second connecting plane 20 substantially parallel with the supporting plane 10, and can be connected, in practice, to a delivery pipe.
  • the second annular flange 18 has several second through-holes (not illustrated in the accompanying drawings) through which it is possible to insert the fixing bolts 15 of a second threaded fixing plate 22 which can be joined to the delivery pipe.
  • the present invention is the result of in-depth studies carried out by the Applicant, which allowed the identification of a combination of features that allow the above-mentioned aims to be achieved, in particular with regard to centrifugal electric pumps of the type described above, with nominal deliveries of less than 350 m 3 /h and nominal heads of less than 100 m.
  • the main casing there are at least two impellers 6 hydraulically positioned in series one after the other (in the sense that the delivery flow for the first impeller 23 is the suction flow of the second impeller 24).
  • the two impellers 6 are coaxial and both keyed on the main shaft 8.
  • the present invention is particularly advantageously applied when the distance D between the central axis 17 of the delivery opening 5 and the first connecting plane 13 is within the range 80 mm ⁇ D ⁇ 160 mm , and/or the distance A between the axis of rotation X and the supporting plane 10 is within the range 110 mm ⁇ A ⁇ 320 mm , and/or the distance B between the axis of rotation X and the second connecting plane 20 is within the range 140 mm ⁇ B ⁇ 45 mm .
  • the following relations preferably apply 0.8 ⁇ A / B ⁇ 0.89 ; 1.3 ⁇ A / D ⁇ 2.0 ; and 1.6 ⁇ B / D ⁇ 2.5.
  • the following relations preferably apply 0.7 ⁇ A / B ⁇ 0.81 ; 1.4 ⁇ A / D ⁇ 2.25 ; and 1.8 ⁇ B / D ⁇ 2.5.
  • the pump casing 2 of an electric pump 1 made in accordance with the present invention is shown in cross-section in Figure 4 .
  • the pump casing 2 consists of an external containment cover 25 forming the suction opening 4 and the delivery opening 5, and also consists of an element 26 for connection to the motor through which the main shaft 8 extends.
  • the containment cover 25 and the connecting element 26 are fixed to one another with a hydraulic seal, whilst the hydraulic seal between the main shaft 8 and the connecting element 26 is guaranteed by a suitable seal element 27.
  • Correct positioning of the seal element 27 is guaranteed by an elastic element 28 coaxial with the central shaft which acts by pushing on the seal element 27.
  • the inside of the pump casing 2 is also divided by a specific diffuser element 29 into a first and a second pumping chamber 30, 31, each housing one of the two impellers 6.
  • the diffuser element 29 is shaped in such a way that it axially conveys by suction to the second impeller 24 the radial-tangential flow from the first impeller 23.
  • the present invention brings important advantages.
  • centrifugal electric pumps disclosed allow higher nominal performance and wider performance curves, thus allowing manufacturers to cover a predetermined range of pumps with a lower number of models than is currently the case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP07425715A 2007-11-13 2007-11-13 Pompe électrique centrifuge avec aspiration axiale Withdrawn EP2060791A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07425715A EP2060791A1 (fr) 2007-11-13 2007-11-13 Pompe électrique centrifuge avec aspiration axiale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07425715A EP2060791A1 (fr) 2007-11-13 2007-11-13 Pompe électrique centrifuge avec aspiration axiale

Publications (1)

Publication Number Publication Date
EP2060791A1 true EP2060791A1 (fr) 2009-05-20

Family

ID=39304639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07425715A Withdrawn EP2060791A1 (fr) 2007-11-13 2007-11-13 Pompe électrique centrifuge avec aspiration axiale

Country Status (1)

Country Link
EP (1) EP2060791A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023151114A1 (fr) * 2022-02-10 2023-08-17 浙江水泵总厂有限公司 Structure de corps de pompe et pompe centrifuge la comprenant

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034489A1 (de) * 1970-07-11 1972-01-13 Allweiler Ag Zweistufige Kreiselpumpe
JPS5281701A (en) * 1975-12-29 1977-07-08 Ebara Corp Single suction multiple stage centrifugal pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034489A1 (de) * 1970-07-11 1972-01-13 Allweiler Ag Zweistufige Kreiselpumpe
JPS5281701A (en) * 1975-12-29 1977-07-08 Ebara Corp Single suction multiple stage centrifugal pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023151114A1 (fr) * 2022-02-10 2023-08-17 浙江水泵总厂有限公司 Structure de corps de pompe et pompe centrifuge la comprenant

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