WO2013000032A1 - Rotor en céramique perfectionné à moyeu métallique - Google Patents

Rotor en céramique perfectionné à moyeu métallique Download PDF

Info

Publication number
WO2013000032A1
WO2013000032A1 PCT/AU2012/000775 AU2012000775W WO2013000032A1 WO 2013000032 A1 WO2013000032 A1 WO 2013000032A1 AU 2012000775 W AU2012000775 W AU 2012000775W WO 2013000032 A1 WO2013000032 A1 WO 2013000032A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
hub
vanes
projections
apertures
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.)
Ceased
Application number
PCT/AU2012/000775
Other languages
English (en)
Inventor
Ayyadevara Venkata Subba Rao
Shrinivasan GOVINDAN THANDAVA KRISHNAN
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.)
Weir Minerals Australia Ltd
Weir Minerals India Pvt Ltd
Original Assignee
Weir Minerals Australia Ltd
Weir Minerals India Pvt Ltd
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
Priority claimed from AU2011904295A external-priority patent/AU2011904295A0/en
Application filed by Weir Minerals Australia Ltd, Weir Minerals India Pvt Ltd filed Critical Weir Minerals Australia Ltd
Publication of WO2013000032A1 publication Critical patent/WO2013000032A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F04D29/2227—Construction and assembly for special materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/20—Oxide or non-oxide ceramics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • This disclosure relates to impellers for use with pumps and particularly relates to an improved ceramic-based impeller design for use in centrifugal slurry pumps used in mineral processing applications.
  • Centrifugal pumps are used in mineral processing applications to handle various liquids and slurries. Components of these pumps, such as the impellers, experience very arduous working conditions which lead to wear due to abrasion by the material being pumped. In some applications, ceramic type impellers are desirable due to their wear resistant properties.
  • an impeller for a pump including: an impeller body formed from a ceramic material and including pumping vanes; an impeller hub formed from a metallic material; the impeller hub includes a central boss arranged to engage with a pump driveshaft wherein the hub further includes a series of projections which are spaced away from the axis of rotation of the hub and the projections engage with apertures in the impeller body; and wherein the projections and corresponding apertures are spaced away from the axis of rotation by a distance of no more than 70% of the radius of the impeller.
  • the hub is located within the impeller body.
  • the impeller body includes an impelling portion and a back vane portion, and the hub is located between the impelling portion and the back vane portion.
  • the projections and apertures are substantially cylindrical.
  • the projections are spaced away from the axis of rotation of the hub by a distance of at least 40% of the radius of the impeller.
  • the projections are spaced away from the axis of rotation of the hub by a distance of about 50% of the radius of the impeller.
  • the apertures in the impeller body are located within the pumping vanes of the impeller.
  • each pumping vane includes no more than one aperture.
  • a region of polyurethane bonds the impeller hub to the impeller body.
  • Some embodiments further include an arrangement of back vanes, and the number of back vanes provided is at least double the number of pumping vanes.
  • the number of back vanes is between three to four times greater than the number of pumping vanes.
  • Some embodiments further include an arrangement of front vanes, and the number of front vanes provided is at least double the number of pumping vanes.
  • the number of front vanes is between three to four times greater than the number of pumping vanes.
  • a method of producing an impeller including the steps of: providing an impeller body formed from a ceramic material and including pumping vanes; providing an impeller hub formed from a metallic material; the impeller hub includes a central boss arranged to engage with a pump driveshaft wherein the hub further includes a series of projections which are spaced away from the axis of rotation of the hub and the projections engage with apertures in the impeller body; and pouring liquid polyurethane in between the impeller hub and the impeller body which flows into the apertures to surround the projections in the apertures.
  • a method of retrofitting a centrifugal pump including the steps of replacing the impeller of the pump with an impeller according to the first aspect.
  • Figure 1 is an exploded view of an impeller for use in a centrifugal pump
  • Figure 2 is a rear view of the impeller of Figure 1 ;
  • Figure 3 is a cross section along the line C-C of Figure 2.
  • Figure 4 is a front view of the impeller of Figure 1.
  • an impeller 10 including a body comprised of an impelling portion 12, an inner back vane portion 14 and an outer back vane portion 15, all of which are formed from a ceramic material, such as silicon carbide.
  • the impelling portion 12 includes major pumping vanes 13 which in use act to pump the medium that is being handled by the pump.
  • the outer back vane portion 15 includes outer back vane portions 19.
  • the back vane portion 14 includes inner back vane portions 17. When the parts shown are assembled together, the inner back vane portions 17 align with the outer back vane portions 19 to form back vanes which, in use, operate to assist in expelling pumping medium away from the driveshaft of the pump to improve sealing of the pump.
  • a hub 16 formed from mild steel is located between the impelling portion 12 and the back vane portion 14 of the impeller 10.
  • the hub 16 includes a central boss 18 for engaging with the metal driveshaft of the pump.
  • the boss 18 includes means for engaging with the driveshaft in the form of an internal screw thread (not visible) which fits to an external screw thread provided on the driveshaft of the pump.
  • the hub 16 further includes a circular plate portion 21 which bears five cylindrical projections 20 which engage with corresponding cylindrical recesses 22 formed in the impelling portion 12.
  • the hub 16 is formed in one piece in a casting process.
  • the projections 20 have threaded ends and are secured with nuts fitted from the front side of the impeller (see Figure 4).
  • the recesses 22 are formed to coincide with the vanes 13 of the impeller portion 12.
  • the recesses 22 are located a distance of approximately 50% of the radius of the impeller away from the central axis of rotation of the impeller in use.
  • liquid polyurethane resin is poured between the hub 16 and the impelling portion 12 which flows into apertures 22 to surround the projections when located in their respective apertures.
  • the polyurethane acts to provide a bond between the hub 16 and the impelling portion 12 and also acts to absorb shock loads which might be experienced, for example during start up and shut down of the impeller 10 in use.
  • the inner back vane portion 14 is affixed to hub 16 by inserting screw fasteners through six apertures 24 provided about the periphery of in inner back vane portion 14, which are received in threaded apertures 23 provided in the hub 16.
  • the outer back vane portion 15 is affixed to the impelling portion 12 by way of a suitable ceramic adhesive.
  • the hub portion 16 transmits torque from the driveshaft to the impeller 10.
  • the projections 20 spread the applied load away from the region nearest the central, axis of the impeller, to reduce the forces applied to the impeller 10. This enables fabrication of one-piece impeller portions, and larger impellers than would otherwise be the case if the projections were not provided.
  • Each pumping vane 13 has only one aperture associated with it, which minimises any weakening effect of forming apertures in these vanes.
  • the impeller hub By forming the impeller hub so that the projections and corresponding apertures are spaced away from the axis of rotation by a distance of no more than 70% of the radius of the impeller, allows a greater fill of ceramic material in the peripheral region of the impeller providing additional strength to that ceramic portion of the impeller.
  • the impeller 10 includes a total of eighteen (18) back vanes 19, and five (5) major pumping vanes 13. It has been found that the operational efficiency of the back vanes 19 is improved if the number of back vanes provided is greater than the number of pumping vanes. In some embodiments, the number of back vanes is at least double the number of major pumping vanes. In some embodiments, the number of back vanes is between three to four times the number of major pumping vanes. Similarly, in some embodiments, front vanes are provided in a similar distribution to the back vanes. At least as twice as many front vanes as major pumping vanes 13 may be provided, and in some embodiments the number of front vanes provided is between three and four times the number of major pumping vanes.
  • Torque from the driveshaft is distributed away from the axis of rotation of the impeller to reduce internal stresses.
  • the metal hub is located within the body of the impeller and so the metal hub is protected from wear.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention porte sur un rotor de pompe, le rotor comprenant : un corps de rotor formé en une matière céramique et comportant des aubes de pompage; et un moyeu de rotor formé en une matière métallique; le moyeu de rotor comprend un bossage central agencé pour coopérer avec un arbre d'entraînement de la pompe, le moyeu comprend en outre une série de saillies qui sont éloignées de l'axe de rotation du moyeu, les saillies coopérant avec des ouvertures du corps du rotor; et les saillies et les ouvertures correspondantes étant éloignées de l'axe de rotation d'une distance non supérieure à 70 % du rayon du rotor.
PCT/AU2012/000775 2011-06-30 2012-07-02 Rotor en céramique perfectionné à moyeu métallique Ceased WO2013000032A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
IN2237/CHE/2011 2011-06-30
IN2237CH2011 2011-06-30
IN3326/CHE/2011 2011-09-26
IN3326CH2011 2011-09-26
AU2011904295A AU2011904295A0 (en) 2011-10-18 An Impeller
AU2011904295 2011-10-18

Publications (1)

Publication Number Publication Date
WO2013000032A1 true WO2013000032A1 (fr) 2013-01-03

Family

ID=47423300

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2012/000775 Ceased WO2013000032A1 (fr) 2011-06-30 2012-07-02 Rotor en céramique perfectionné à moyeu métallique

Country Status (1)

Country Link
WO (1) WO2013000032A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016096808A1 (fr) * 2014-12-19 2016-06-23 Ksb Aktiengesellschaft Roue à aubes de pompe centrifuge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759690A (en) * 1984-05-24 1988-07-26 Deschamps John A Impeller
WO2008038306A2 (fr) * 2006-09-28 2008-04-03 Weir Minerals India Private Limited Turbine céramique à aubes solidaires améliorée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759690A (en) * 1984-05-24 1988-07-26 Deschamps John A Impeller
EP0169637B1 (fr) * 1984-05-24 1988-11-17 Moh-9 (Proprietary) Limited Roue à aubes pour pompe
WO2008038306A2 (fr) * 2006-09-28 2008-04-03 Weir Minerals India Private Limited Turbine céramique à aubes solidaires améliorée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016096808A1 (fr) * 2014-12-19 2016-06-23 Ksb Aktiengesellschaft Roue à aubes de pompe centrifuge
CN107250551A (zh) * 2014-12-19 2017-10-13 Ksb 股份公司 回转泵工作轮

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