WO2018049436A2 - Ligne médiane à écoulement radial au niveau de l'entrée par rapport au diamètre d'entrée - Google Patents

Ligne médiane à écoulement radial au niveau de l'entrée par rapport au diamètre d'entrée Download PDF

Info

Publication number
WO2018049436A2
WO2018049436A2 PCT/ZA2017/050058 ZA2017050058W WO2018049436A2 WO 2018049436 A2 WO2018049436 A2 WO 2018049436A2 ZA 2017050058 W ZA2017050058 W ZA 2017050058W WO 2018049436 A2 WO2018049436 A2 WO 2018049436A2
Authority
WO
WIPO (PCT)
Prior art keywords
radius
curvature
central axis
slurry
inner face
Prior art date
Application number
PCT/ZA2017/050058
Other languages
English (en)
Other versions
WO2018049436A3 (fr
Inventor
Siegfried Geldenhuys
Original Assignee
Mechanical Engineering Transcendent Technology (Pty) 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
Application filed by Mechanical Engineering Transcendent Technology (Pty) Ltd filed Critical Mechanical Engineering Transcendent Technology (Pty) Ltd
Publication of WO2018049436A2 publication Critical patent/WO2018049436A2/fr
Publication of WO2018049436A3 publication Critical patent/WO2018049436A3/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
    • 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
    • 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
    • F04D29/2216—Shape, geometry
    • 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
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet

Definitions

  • This invention relates to an end suction centrifugal slurry pump and in particular relates to streamline characteristics of this type of pump.
  • slurry enters the pump in an axial direction. The direction of slurry flow is gradually changed through 90° so that the slurry then flows at a right angle to the axial direction, to impart to the slurry flow sufficient kinetic energy in order to generate a designed head and slurry flow rate.
  • the slurry flow can be characterised by the nature of a streamline which is described hereinafter with reference to Figure 1 of the accompanying drawings which is an end view of an impeller 10 of a slurry pump of conventional construction.
  • Figure 2 shows the impeller 10 in cross section taken on a line 2-2 in Figure 1.
  • the impeller 10 includes a front shroud 12 with an inner face 14, and a back shroud 16 with a profiled surface 18 which is spaced from and which opposes the inner face 14.
  • An operating volume 22 is formed in part between the inner face 14 and the opposing profiled surface 18.
  • Primary vanes, not shown, are located in the operating volume 22.
  • the impeller 0 has a central rotational axis 26 and an impeller, not shown, is mounted for rotation about the central axis 26.
  • Slurry to the operating volume 22 is delivered an via inlet structure 30 which is centred on the central axis 26.
  • the inlet structure 30 has a diameter which may be constant or which may vary. However, such diameter at some location, has a minimum magnitude designated D.
  • a streamline 40 is thereby defined. The streamline 40 is positioned midway between the curved annular section 34 and the curved annular portion 38.
  • the radius of curvature R2 when projected towards the central axis 26, tangentially intersects the central axis 26 as is indicated by means of a dotted line 44.
  • the streamline 40 when extended towards the central axis 26, is spaced from the central axis 26 by a radial distance R. As the streamline 40 extends into a discharge passage 48 from the operating volume 22, it tangentially intersects a centerline 50 of the discharge passage 48.
  • Figure 1 shows the inlet structure 30 viewed in the direction of an arrow A (in Figure 2) which is aligned with the central axis 26.
  • the streamline 40 varies in three dimensions and, in the cross section shown in Figure 1 , lies on a circular path, with a diameter D2.
  • a primary consideration in the design of a centrifugal slurry pump is to take into account the attrition caused to the pump by the slurry which is being pumped.
  • the slurry As the slurry enters the operating volume 22 it changes direction from an axial flow to a radial flow.
  • the velocity of the slurry flow towards the front shroud 12 and the velocity of the slurry flow towards the back shroud 16 vary in order to maintain the same level of momentum throughout the slurry flow. To this end the slurry flow velocity towards the front shroud 12 accelerates relative to the flow rate on the streamline 40 and this leads to an increased rate of attrition of components in the pump.
  • An object of the present invention is to address, at least to some extent, the degree of attrition due to slurry flow.
  • the invention provides an impeller of a centrifugal pump configured so that a streamline of slurry flow from an inlet to an outlet follows a path which at the inlet lies on a circle with a diameter which is equal to 50% of the diameter of the inlet, and which is midway between opposing curved surfaces which bound the outlet.
  • the invention extends to an impeller of an end suction centrifugal slurry pump which includes a front shroud which has an inner face, a back shroud with a profiled surface which opposes the inner face, whereby an operating volume is formed at least between the inner face and the profiled surface in which primary vanes are located, the impeller being mounted for rotation about a central axis, a slurry discharge outlet from the operating volume, said slurry discharge outlet having a centerline which is perpendicular to the central axis, inlet structure which is on the front shroud, which forms a flow passage centered on the central axis with a discharge end which axially directs slurry flow into the operating volume, said flow passage having a diameter with a magnitude and said magnitude having a minimum value equal to D, an annular section of the inner face, around said discharge end, in cross section on a plane in which the central axis lies, having a radius of curvature equal to RF, wherein, at one end, said
  • Figure 3 is similar to Figure 2 (already discussed with reference to a problem associated with a prior art configuration) but illustrates a configuration of an end suction centrifugal slurry pump according to the invention
  • Figure 4 graphically depicts material loss in a slurry pump due to attrition for various impeller inlet profiles as a function of cost and attrition which are essential slurry pump operating parameters.
  • Figure 3 is a side view in cross section of an impeller 50, of an end suction slurry pump, according to the invention.
  • the cross sectional view in Figure 3 is similar to that in Figure 2.
  • the impeller 50 thus has a front shroud 52 with an inner face 54, and a back shroud 56 with a profiled surface 58.
  • An operating volume 62 is bounded at least partly by the inner face 54 and the profiled surface 58.
  • Primary vanes, not shown, are located in the operating volume 62.
  • the impeller 50 is mounted for rotation about a central axis 66.
  • An impeller discharge outlet 68 extends from the operating volume 62.
  • the discharge outlet 68 has a centreline 70 which is perpendicular to the central axis 66.
  • An inlet structure 72 is used to direct slurry flow axially into the operating volume 62 i.e. in a direction which is parallel to the central axis 66. [0018]
  • the inlet structure 72 forms a flow passage 74 with a diameter which has a minimum value designated D. At a discharge end 76 of the flow passage 74 slurry is directed into the operating volume 62.
  • An annular section 80 of the inner face 54 around the discharge end 76 comprises a curved surface which has a radius of curvature RF.
  • the curved surface is defined by the shape of the annular section 80 taken on a plane in which the central axis 66 lies. At one end, the curved surface tangentially intersects the inner face 54 while, at an opposing end, the curved surface of the annular section 80 tangentially intersects the minimum diameter line D.
  • the profiled surface 58 has a curved annular portion 82 which has a radius of curvature RB which opposes the annular section 80.
  • the curved surface 82 at one end, tangentially intersects a wall 84 of the discharge outlet 68 and, at an opposing end, an extension on extermination of the surface 82 tangentially intersects the central axis 66.
  • a streamline 94, with a radius of curvature RS, is formed along a path 96 which is midway between the annular section 80 and the curved surface 82. At one end the radius of curvature RS tangentially intersects the centreline 70 of the discharge outlet 68. At an opposing end the radius of curvature RS enters the flow passage 74 along a path which is generally parallel to the central axis 66 and which is spaced, in a radial sense, from the central axis 66 by a distance K/2.

Landscapes

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

Abstract

Une roue d'une pompe centrifuge est conçue de manière qu'une ligne d'écoulement d'un écoulement de boue allant d'une entrée à une sortie suit un trajet qui, au niveau de l'entrée, repose sur un cercle avec un diamètre qui est égal à 50% du diamètre de l'entrée, et qui est à mi-chemin entre des surfaces incurvées opposées qui sont rattachées à la sortie.
PCT/ZA2017/050058 2016-09-08 2017-09-08 Ligne médiane à écoulement radial au niveau de l'entrée par rapport au diamètre d'entrée WO2018049436A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201606232 2016-09-08
ZA2016/06232 2016-09-08

Publications (2)

Publication Number Publication Date
WO2018049436A2 true WO2018049436A2 (fr) 2018-03-15
WO2018049436A3 WO2018049436A3 (fr) 2018-06-07

Family

ID=61257133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2017/050058 WO2018049436A2 (fr) 2016-09-08 2017-09-08 Ligne médiane à écoulement radial au niveau de l'entrée par rapport au diamètre d'entrée

Country Status (1)

Country Link
WO (1) WO2018049436A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2809288Y (zh) * 2005-05-26 2006-08-23 石家庄工业水泵有限公司 压滤机给料专用泵
RU2688066C2 (ru) * 2014-04-23 2019-05-17 Зульцер Мэнэджмент Аг Рабочее колесо для центробежного насоса, центробежный насос, а также его использование
CN204755391U (zh) * 2015-06-29 2015-11-11 江西省万载水泵有限责任公司 一种纸浆泵叶轮

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
WO2018049436A3 (fr) 2018-06-07

Similar Documents

Publication Publication Date Title
US9874219B2 (en) Impeller and fluid machine
JP6367917B2 (ja) ベーンを有するラジアルまたは混流圧縮機ディフューザ
US20130309082A1 (en) Centrifugal turbomachine
CN101165355A (zh) 风扇平台肋片
US3936225A (en) Diagonal impeller pump
KR102347638B1 (ko) 반밀폐형 임펠러
KR101616617B1 (ko) 곡선형 블레이드들을 가지는 송풍기
KR20160021229A (ko) 원심력 회전자
US20170009777A1 (en) Fluid pump
KR20150032686A (ko) 원심펌프의 임펠러 흡입 안내장치
WO2018049436A2 (fr) Ligne médiane à écoulement radial au niveau de l'entrée par rapport au diamètre d'entrée
JP5260579B2 (ja) 電動送風機、それを搭載した電気掃除機
JP2016050486A (ja) 流体機械、及び流体機械の羽根車
JP2018080653A (ja) 流体機械
WO2016092873A1 (fr) Turbine de compresseur centrifuge
EP2734736B1 (fr) Améliorations apportées des pompes et composants utilisés à cet effet
KR101473691B1 (ko) 원심펌프의 임펠러
JP2016109092A5 (fr)
US20150020885A1 (en) Check valve assembly
JP2014202102A (ja) 遠心圧縮機
JP5781335B2 (ja) ポンプ逆転水車
RU93476U1 (ru) Радиальное рабочее колесо насоса, вентилятора или компрессора
EP3018360B1 (fr) Agencement de canaux d'admission pour un boîtier de volute d'une pompe centrifuge, élément de bride, enveloppe à volute pour pompe centrifuge et ladite pompe
CA3047806A1 (fr) Pompe non colmatable
WO2019220579A1 (fr) Pompe multi-étage

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17844593

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17844593

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 17844593

Country of ref document: EP

Kind code of ref document: A2