EP3889437A1 - Kreiselpumpenlaufrad - Google Patents

Kreiselpumpenlaufrad Download PDF

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Publication number
EP3889437A1
EP3889437A1 EP20167250.8A EP20167250A EP3889437A1 EP 3889437 A1 EP3889437 A1 EP 3889437A1 EP 20167250 A EP20167250 A EP 20167250A EP 3889437 A1 EP3889437 A1 EP 3889437A1
Authority
EP
European Patent Office
Prior art keywords
disk
impeller assembly
ribs
central hole
disc
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.)
Pending
Application number
EP20167250.8A
Other languages
English (en)
French (fr)
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 EP20167250.8A priority Critical patent/EP3889437A1/de
Publication of EP3889437A1 publication Critical patent/EP3889437A1/de
Pending 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F04D29/2233—Construction and assembly entirely open or stamped from one sheet

Definitions

  • the present invention relates to an impeller assembly associable with a centrifugal pump.
  • centrifugal pumps for domestic, agricultural or industrial use is currently known, in particular for pumping water.
  • These pumps comprise one or more impeller assemblies capable of being rotated by a suitable motor member, generally of the electric type.
  • centrifugal pumps use the centrifugal effect of the impeller assembly to move the liquid.
  • the impeller sucks the liquid from an axial suction inlet and transfers mechanical energy to it, transmitted by the motor.
  • the impeller is provided with a series of curved blades, which form channels with a growing section, from the center to the periphery. The liquid entering the central part of the impeller passes through these channels, converting the kinetic energy transmitted by the movement of the impeller into pressure energy.
  • the impeller assembly consists of two suitably shaped discoidal elements, arranged coaxial to the rotation axis and connected by a series of blades radially arranged inside the interspace defined between said discoidal elements.
  • the discoidal elements are centrally provided with means of fixing to a transmission shaft, rotatable around the axis of rotation.
  • the present invention aims at solving the mentioned problems, by devising an impeller assembly associable with a centrifugal pump, which enables a high efficiency to be achieved even with a structure having relatively cheap cost.
  • Still another object of the invention is to provide an impeller assembly of simple construction and functional conception, provided with reliable operation and versatile use.
  • the impeller assembly comprises a first disk and a second disk made of cold pressed steel.
  • said first disk and said second disk have the same external diameter.
  • Said first disk and said second disk are firmly assembled with each other, preferably by welding.
  • Said first disk has a central hole and a plurality of ribs obtained by pressing on a face of the same first disk facing said second disk.
  • Said second disk is provided with a central hole.
  • said second disc is provided with a rim protruding from said central hole.
  • Said first disk and said second disk are firmly assembled with each other so as to form, between the said first disk and the said second disk, a plurality of channels separated by said ribs.
  • said first disk and said second disk are assembled by welding.
  • a cavity is defined between said first disk and said second disk, whose height is given by the height of said ribs.
  • said ribs have an inverted U-shaped configuration in section, having constant dimensions along the entire development of the rib.
  • said ribs extend from the center towards the periphery of said first disk according to a curvilinear profile, so that said channels take a divergent shape.
  • said first disc has a circular lowering at said central hole, suitable for defining the coupling seat with a member of junction to a shaft for transmitting the motion to the impeller assembly.
  • said central hole of the first disk is shaped according to a prismatic profile to couple with a corresponding grooved portion of a shaft for transmitting the motion to the impeller assembly.
  • the present invention also relates to a centrifugal pump comprising at least one impeller assembly capable of being operated in rotation by a shaft of transmission of motion, axially assembled with the same impeller assembly, and comprising a first disk and a second disk made of cold pressed steel, said first disc being provided with a plurality of ribs obtained by pressing on a face of the same first disc facing said second disc, said first disc and said second disc being firmly assembled with each other so that a plurality of channels separated by said ribs is formed, between said first disk and said second disk.
  • the impeller assembly 1 comprises a first disk 10 and a second disk 20 made of cold pressed steel and firmly assembled with each other, preferably by welding.
  • the first disk 10 and the second disk 20 have substantially the same external diameter.
  • the first disk 10 has a central hole 11.
  • the central hole 11 is made in the center of a circular lowering 12 of the surface of the first disk 10.
  • the ribs 13 are configured such that they shape, between the first disk 10 and the second disk 20, a plurality of channels 14 separated by the ribs 13.
  • the ribs 13 are capable of establishing the height of a cavity, which is thus made between the first disk 10 and the second disk 20, equal to the height of said channels 14.
  • the ribs 13 expand substantially from the center to the periphery of the first disk 10 along a curvilinear profile.
  • the channels 14 defined by the ribs 13 therefore have a divergent shape.
  • the ribs 13 have an inverted U-shaped configuration in section having constant dimensions along the entire development of the rib.
  • the second disk 20 is provided with a central hole 21.
  • a member of junction 30 to the shaft for transmitting the motion to the impeller assembly 1, not shown in the drawings, is suitable to be associated with the central hole 11 of the first disk 10.
  • the member of junction 30 is made up of a sleeve 31 externally shaping an annular rim 32 by means of which it is capable of resting, in a configuration of assembly, inside the circular lowering 12 of the first disk 10 (see in particular Fig. 2 ).
  • the sleeve 31 axially has a truncated cone-shaped cavity 33 for coupling with the shaft for transmitting the motion to the impeller assembly 1.
  • the first disc 10 has axially a hole shaped according to a prismatic profile, for example cross-like or the like, for clarity still indicated with number 11.
  • the hole 11 is suitable for coupling with a corresponding suitably grooved portion of the shaft for transmitting the motion to the impeller assembly 1.
  • this different embodiment does not require the presence of a specific member of junction for coupling the shaft for transmitting the motion to the impeller assembly 1.
  • the impeller assembly according to the invention therefore achieves the aim of improving the impeller assemblies commonly used in the prior art.
  • the impeller assembly described by way of example, may be modified according to the different requirements.
  • the materials that are used, as well as the shape and dimensions, may change any according to the requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP20167250.8A 2020-03-31 2020-03-31 Kreiselpumpenlaufrad Pending EP3889437A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20167250.8A EP3889437A1 (de) 2020-03-31 2020-03-31 Kreiselpumpenlaufrad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20167250.8A EP3889437A1 (de) 2020-03-31 2020-03-31 Kreiselpumpenlaufrad

Publications (1)

Publication Number Publication Date
EP3889437A1 true EP3889437A1 (de) 2021-10-06

Family

ID=70861188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20167250.8A Pending EP3889437A1 (de) 2020-03-31 2020-03-31 Kreiselpumpenlaufrad

Country Status (1)

Country Link
EP (1) EP3889437A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789674A (en) * 1954-12-03 1958-01-29 Plessey Co Ltd Improvements in or relating to impellers
US3139034A (en) * 1961-06-17 1964-06-30 Amirault Maxime Impeller for centrifugal pump
ES2123409A1 (es) * 1996-01-23 1999-01-01 Bombas Electricas Sa Rodete cerrado para bombas centrifugas.
US6386831B1 (en) * 1997-11-21 2002-05-14 Hermann Stahl Gmbh Fan wheel
WO2016060221A1 (en) 2014-10-14 2016-04-21 Ebara Corporation Impeller assembly for centrifugal pumps

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789674A (en) * 1954-12-03 1958-01-29 Plessey Co Ltd Improvements in or relating to impellers
US3139034A (en) * 1961-06-17 1964-06-30 Amirault Maxime Impeller for centrifugal pump
ES2123409A1 (es) * 1996-01-23 1999-01-01 Bombas Electricas Sa Rodete cerrado para bombas centrifugas.
US6386831B1 (en) * 1997-11-21 2002-05-14 Hermann Stahl Gmbh Fan wheel
WO2016060221A1 (en) 2014-10-14 2016-04-21 Ebara Corporation Impeller assembly for centrifugal pumps

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