WO2009032299A1 - Plaque d'usure pour pompe centrifuge - Google Patents

Plaque d'usure pour pompe centrifuge Download PDF

Info

Publication number
WO2009032299A1
WO2009032299A1 PCT/US2008/010405 US2008010405W WO2009032299A1 WO 2009032299 A1 WO2009032299 A1 WO 2009032299A1 US 2008010405 W US2008010405 W US 2008010405W WO 2009032299 A1 WO2009032299 A1 WO 2009032299A1
Authority
WO
WIPO (PCT)
Prior art keywords
wear plate
wear
plate
impeller
centrifugal pump
Prior art date
Application number
PCT/US2008/010405
Other languages
English (en)
Inventor
Kim M. Arnold
James Northrup
Kenneth Sessum
Original Assignee
Envirotech Pumpsystems, Inc.
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 Envirotech Pumpsystems, Inc. filed Critical Envirotech Pumpsystems, Inc.
Priority to CN200880105696A priority Critical patent/CN101796267A/zh
Priority to CA2696883A priority patent/CA2696883A1/fr
Priority to JP2010524035A priority patent/JP2010538214A/ja
Priority to BRPI0816199 priority patent/BRPI0816199A2/pt
Priority to MX2010002401A priority patent/MX2010002401A/es
Priority to AU2008296843A priority patent/AU2008296843B2/en
Publication of WO2009032299A1 publication Critical patent/WO2009032299A1/fr

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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • 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
    • F04D7/045—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 with means for comminuting, mixing stirring or otherwise treating

Definitions

  • Centrifugal pumps are structured with a pump casing in which an impeller is positioned for rotation. To maximize pump efficiency, the impeller is positioned in close proximity to the pump casing inner surface to provide minimal tolerances between the impeller and the pump casing. When such pumps are used to process fluids with a solids content, the solids tend to erode or wear the inner surface of the pump casing, thereby leading to reduced pump efficiencies.
  • U.S. Patent No. 7,037,069 to Arnold further discloses a wear plate for use in a centrifugal pump employing a single vane spiral-type impeller where the wear surface of the wear plate is provided with flow interrupters in the form of notches and recesses that are perpendicular to the axis or rotation, and/or that extend in a direction opposite to the direction of rotation of the impeller.
  • the notches and recesses are provided to interrupt the flow of fluid along the vane of the impeller and to dislodge and clean solids from the impeller to move the solids toward the volute of the pump for discharge.
  • the flow interrupters are positioned on the wear plate to remove solids from the impeller vane; however, they do not provide cutting or chopping of the solids.
  • a wear plate for use in a centrifugal pump is structured with at least one cutting element, but most suitably a plurality of cutting elements, positioned at the inner bore of the wear plate.
  • the cutting elements are positioned to impact the impeller and are oriented in a direction relative to the rotation of the impeller so that the cutting elements can capture the solids and hold them in place until they can be cut by the impeller blade or blades.
  • Cutting elements on the wear plate of the present invention may be distributed or spaced evenly or unevenly about the inner bore of the wear plate and may have any shape, size, dimension or configuration which will effectively cause cutting of solids at the inner bore of the wear plate.
  • the solids are more quickly reduced for processing rather than being simply flushed into the impeller, as is the purpose of prior art wear plates. Additionally, the wear on the wear plate and impeller are reduced so that the pump operation life is not decreased.
  • the cutting elements of the wear plate of the present invention are further configured with a wall, defined by the thickness of the wear plate and extending from the non-wear surface (i.e., that surface positioned away from the impeller) to the wear surface (i.e., that surface positioned adjacent the impeller), which is angled from the non-wear surface to the wear surface of the wear plate, thereby imbuing the cutting elements with a self-sharpening edge as the wear plate wears.
  • FIG. 1 is a perspective view in partial cutaway of a conventional self-priming pump illustrating the relative positioning of the impeller and wear plate
  • FIG. 2 is a perspective view in partial cutaway of a self-priming pump illustrating the placement of the wear plate of the present invention
  • FIG. 3 is a perspective view of a prior art wear plate having a smooth inner bore
  • FIG. 4 is a perspective view of the wear plate of the present invention
  • FIG. 5 is a perspective view of the wear plate and impeller as viewed from the wear surface of the wear plate;
  • FIG. 6 is a perspective view of the wear plate and impeller as viewed from the non-wear surface of the wear plate;
  • FIG. 7 is a plan view of the non-wear surface of the wear plate of the present invention.
  • FIG. 8 is an enlarged view of the cutting elements of the wear plate
  • FIG. 9 is a view in cross section of the radius of the wear plate shown in FIG. 7, taken at line 9-9;
  • FIG. 10 is a perspective view of a prior art wear plate having a conical shaped wear surface
  • FIG. 11 is a perspective view of the prior art wear plate shown in FIG. 10 illustrating the non-wear surface of the wear plate;
  • FIG. 12 is a plan view of an alternative embodiment of the wear plate of the present invention, the wear plate being generally frustoconical in shape;
  • FIG. 13 is a view in cross section of the wear plate shown in FIG. 12 taken at line 13-13;
  • FIG. 14 is a perspective view of the non-wear surface of the wear plate shown in FIG. 12;
  • FIG. 15 is a perspective view of the wear plate of FIG. 12 shown in position adjacent an impeller; and FIG. 16 is a perspective view of the non-wear surface of the wear plate shown in FIG. 15 illustrating the interaction between the wear plate and impeller.
  • the wear plate of the present invention is adaptable for use in any type of centrifugal pump which employs or can employ a wear plate positioned between the impeller and the pump casing or another adjacent structure of the pump.
  • the present invention is described herein with respect to a self-priming pump by way of example only. Those of skill in the art will understand, based on the present disclosure, how to adapt the present invention to other types of centrifugal pumps.
  • FIG. 1 illustrates a conventional self-priming pump 10 which generally comprises a pump casing 12, an inlet 14 and an outlet 16.
  • the impeller 18 is supported at the end of a bearing housing 20 and is connected to a drive shaft 22 for rotation.
  • a clean out assembly 24 is axially aligned with the impeller 18 and comprises an end cover 26 and a supporting ring 28 that is spaced from the end cover 26 by a plurality of stanchions 30.
  • the supporting ring 28 provides a means for attachment of a wear plate 32, which positions the wear plate adjacent the impeller 18.
  • the prior art wear plate 32 is generally configured as a flat plate having a thickness T extending between a non- wear surface 34 and an opposing wear surface 36 that is provided for orientation adjacent the impeller.
  • the wear plate 32 is formed with an inner bore 38 that extends through the thickness of the flat plate and is provided with an inner circumferential edge 40 that surrounds the inner bore 38.
  • the inner circumferential edge is smooth.
  • FIG. 3 also illustrates that the wear plate 32 may be secured to the supporting ring 28 by bolts 44.
  • the wear plate 50 of the present invention is shown in FIGS. 2 and 4.
  • the wear plate 50 of the present invention is likewise supported by a supporting ring 28 of a clean out assembly 24, and is positioned adjacent the impeller 18.
  • FIG. 4 more clearly illustrates that the wear plate 50 of the present invention is formed, in this first embodiment, as a flat plate having a thickness T extending between a non-wear surface 52 and an opposing wear surface 54 that is provided for orientation adjacent an impeller.
  • the wear plate 50 is provided with means for attachment of the wear plate 50 to the supporting ring 28 of the clean out assembly, such as bolts 56.
  • the wear plate 50 has an inner bore 58 formed through the center of the wear plate 50 and the inner bore 58 is formed with an inner circumferential edge 60.
  • the inner circumferential edge 60 of the wear plate 50 is formed with at least one or, as shown here, a plurality of cutting elements 62.
  • the cutting elements 62 are positioned to interact with the blade 66 or blades of the impeller 18 to produce a cutting action at the inner circumferential edge 60 of the wear plate 50.
  • the cutting action of solids at the inner bore 58 of the wear plate 50 assures that solids, particularly stringy materials, are processed to a smaller and/or more suitable form for movement by and through the impeller 18.
  • the cutting elements 62 are generally produced by forming notches 70 in the inner circumferential edge 60 of the inner bore 58.
  • the notches extend from the inner circumferential edge 60 toward the outer edge 74 of the wear plate 50.
  • Two adjacently- formed notches 70 produce a tooth 72.
  • the plurality of teeth 72 may be spaced evenly about the inner circumferential edge 60.
  • the cutting elements 62 may be spaced unevenly about the inner circumferential edge 60.
  • the notches 70 formed in the inner circumferential edge 60 are preferably formed at a tangential angle to the inner circumferential edge
  • a center line 76 (FIG. 7) of the notch 70 extends in the direction of rotation of the impeller, as shown in FIG. 5.
  • the angle of the notches 70 facilitates the capture of solids material in the notch to enable cutting by the blade or blades 66 of the impeller 18.
  • the notches 70 and teeth 72 are formed with a wall surface 80 that is defined by the thickness between the wear surface 54 and the oppositely-facing non-wear surface 52 of the wear plate 50.
  • the notches 70 are formed by cutting or machining through the thickness of the wear plate 50 at an angle to a plane 82, formed through the thickness of the wear plate 50, that is perpendicular to the planes of the wear surface 54 and non-wear surface 52 of the wear plate 50. That is, the angle A of the wall 80 is directed toward the center
  • the center 84 of the wear plate 50 when positioned in a pump, is co-axial with the rotational axis of the impeller.
  • the cutting elements 62 or teeth 72 of the wear plate 50 are self-sharpening as the wear plate 50 becomes worn by its interaction with the impeller (it being understood in the art that the wear plate 50 is axially adjusted toward the impeller from time to time as the wear plate 50 becomes worn).
  • FIGS. 10 and 11 again illustrate a frustoconical wear plate 90 that is known in the prior art.
  • the wear plate 90 has an inner bore 92 with a smooth inner circumferential edge 94.
  • FIG. 10 illustrates the wear surface 96 of the frustoconical wear plate 90 and
  • FIG. 11 illustrates the non-wear surface
  • FIGS. 12-14 illustrate a frustoconically-shaped embodiment of the wear plate 100 of the present invention where the inner bore 102 has an inner circumferential edge 104 that is formed with at least one cutting element 106, or a plurality of cutting elements 106 as shown.
  • FIG. 12 illustrates the wear surface 108 of the wear plate 100 and
  • FIG. 14 illustrates the non-wear surface 110 of the wear plate 100.
  • the cutting elements 106 are formed in the manner previously described with respect to the flat plate embodiment illustrated in FIGS. 7-9, including the formation of the cutting elements to provide a self-sharpening capability.
  • FIG. 15 further illustrates the frustoconically-shaped wear plate
  • FIG. 16 illustrates the non-wear surface 110 of the wear plate 100 and illustrates the interaction of the cutting elements 106 with the blades 122 of the impeller 120.
  • FIGS. 15 and 16 illustrate the position and direction of the cutting elements relative to the direction of rotation of the impeller 120, as denoted by arrow 126. It can be appreciated from the view of FIG. 16 that the notches 128 formed between the cutting elements 106 effectively trap solids therein for cutting by the leading edge 130 of the impeller blades 122 as the impeller rotates.
  • the wear plate of the present invention can be adapted for use in any type of centrifugal pump having an impeller, and especially a pump that is used to process fluids which are laden with solids material.
  • a pump that is used to process fluids which are laden with solids material.

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

Abstract

L'invention porte sur une plaque d'usure destinée à être utilisée dans une pompe centrifuge, laquelle plaque d'usure est structurée avec au moins un élément de coupe positionné au niveau de l'alésage interne de la plaque d'usure, le ou les éléments de coupe étant positionnés pour percuter le bord de coupe des aubes d'une roue et orientés dans une direction par rapport à la rotation de la roue de telle sorte que le ou les éléments de coupe de la plaque d'usure peuvent capturer les matières solides présentes dans un fluide traité et les maintenir en place jusqu'à ce qu'elles puissent être coupées par la ou les aubes de la roue, les éléments de coupe de la plaque d'usure étant en outre structurés pour être auto-aiguisants.
PCT/US2008/010405 2007-09-04 2008-09-04 Plaque d'usure pour pompe centrifuge WO2009032299A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN200880105696A CN101796267A (zh) 2007-09-04 2008-09-04 用于离心泵的防磨板
CA2696883A CA2696883A1 (fr) 2007-09-04 2008-09-04 Plaque d'usure avec elements de coupe pour pompe centrifuge
JP2010524035A JP2010538214A (ja) 2007-09-04 2008-09-04 遠心ポンプ用の摩耗板
BRPI0816199 BRPI0816199A2 (pt) 2007-09-04 2008-09-04 Chapa de desgaste para uma bomba centrífuga
MX2010002401A MX2010002401A (es) 2007-09-04 2008-09-04 Placa de desgaste para bomba centrifuga.
AU2008296843A AU2008296843B2 (en) 2007-09-04 2008-09-04 Wear plate for a centrifugal pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US96744007P 2007-09-04 2007-09-04
US60/967,440 2007-09-04

Publications (1)

Publication Number Publication Date
WO2009032299A1 true WO2009032299A1 (fr) 2009-03-12

Family

ID=40429217

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/010405 WO2009032299A1 (fr) 2007-09-04 2008-09-04 Plaque d'usure pour pompe centrifuge

Country Status (9)

Country Link
US (1) US20090232639A1 (fr)
JP (1) JP2010538214A (fr)
CN (1) CN101796267A (fr)
AU (1) AU2008296843B2 (fr)
BR (1) BRPI0816199A2 (fr)
CA (1) CA2696883A1 (fr)
MX (1) MX2010002401A (fr)
WO (1) WO2009032299A1 (fr)
ZA (1) ZA201009018B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010039858A1 (fr) * 2008-09-30 2010-04-08 The Gorman-Rupp Company Pompe-hachoir
US10330110B2 (en) * 2009-10-08 2019-06-25 Sulzer Management Ag Pump impeller
US8657564B2 (en) * 2011-11-16 2014-02-25 Walter James Cuppetelli Centrifugal chopper pump
US9670929B2 (en) * 2013-01-15 2017-06-06 General Electric Company Methods and system for detecting turbocharger degradation
US20150118024A1 (en) * 2013-10-24 2015-04-30 Bryce Thiel Centrifugal pump with self-cleaning wear plate
EP3988794A1 (fr) * 2020-10-26 2022-04-27 Xylem Europe GmbH Siège de roue pour une pompe doté d'une broche de guidage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4778336A (en) * 1987-07-09 1988-10-18 Weil Pump Company Cutter pump subassembly
US5516261A (en) * 1993-11-15 1996-05-14 Wilo Gmbh Unchokable centrifugal pump
US7037069B2 (en) * 2003-10-31 2006-05-02 The Gorman-Rupp Co. Impeller and wear plate

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Publication number Priority date Publication date Assignee Title
US3128051A (en) * 1960-11-07 1964-04-07 Dag Mfg Co Pump
US3096718A (en) * 1961-12-12 1963-07-09 Conard Kenner Trash cutter for a pump
US3447475A (en) * 1967-01-09 1969-06-03 Albert Blum Centrifugal pump
JPS5147601A (en) * 1974-10-21 1976-04-23 Erehon Kk Osuihonpuno katsutaakoteiba
JPS5930586U (ja) * 1982-08-20 1984-02-25 株式会社鶴見製作所 水中ポンプにおける夾雑物の切断機構
US5456580A (en) * 1992-05-26 1995-10-10 Vaughan Co., Inc. Multistage centrifugal chopper pump
SE520417C2 (sv) * 1997-12-18 2003-07-08 Flygt Ab Itt Pump av centrifugal- eller halvaxiell typ avsedd för pumpning av orensat avloppsvatten
SE520740C2 (sv) * 1998-06-30 2003-08-19 Abs Pump Prod Ab Centrifugalpump
US6190121B1 (en) * 1999-02-12 2001-02-20 Hayward Gordon Limited Centrifugal pump with solids cutting action
GB2371834B (en) * 1999-10-06 2004-03-10 Vaughan Co Centrifugal pump improvements
JP5069123B2 (ja) * 2004-12-03 2012-11-07 ブリンクマン プンペン ケー．ハー．ブリンクマン ゲーエムベーハー ウント コー．ケーゲー 切断インペラを有するポンプ
US7159806B1 (en) * 2005-01-18 2007-01-09 Ritsema Stephen T Cutter assembly for a grinder pump
US7841550B1 (en) * 2007-11-20 2010-11-30 Vaughan Co., Inc. Cutter nut and cutter bar assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4778336A (en) * 1987-07-09 1988-10-18 Weil Pump Company Cutter pump subassembly
US5516261A (en) * 1993-11-15 1996-05-14 Wilo Gmbh Unchokable centrifugal pump
US7037069B2 (en) * 2003-10-31 2006-05-02 The Gorman-Rupp Co. Impeller and wear plate

Also Published As

Publication number Publication date
BRPI0816199A2 (pt) 2015-04-14
ZA201009018B (en) 2011-09-28
CA2696883A1 (fr) 2009-03-12
MX2010002401A (es) 2010-03-25
CN101796267A (zh) 2010-08-04
AU2008296843A1 (en) 2009-03-12
AU2008296843B2 (en) 2011-08-18
US20090232639A1 (en) 2009-09-17
JP2010538214A (ja) 2010-12-09

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