EP0475920A1 - Clog resistant pump - Google Patents

Clog resistant pump Download PDF

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Publication number
EP0475920A1
EP0475920A1 EP91850194A EP91850194A EP0475920A1 EP 0475920 A1 EP0475920 A1 EP 0475920A1 EP 91850194 A EP91850194 A EP 91850194A EP 91850194 A EP91850194 A EP 91850194A EP 0475920 A1 EP0475920 A1 EP 0475920A1
Authority
EP
European Patent Office
Prior art keywords
pump
vanes
pump housing
housing
impeller
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.)
Granted
Application number
EP91850194A
Other languages
German (de)
French (fr)
Other versions
EP0475920B1 (en
Inventor
Ulf Arbeus
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.)
Xylem Water Solutions AB
Original Assignee
ITT Flygt AB
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20380333&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0475920(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ITT Flygt AB filed Critical ITT Flygt AB
Publication of EP0475920A1 publication Critical patent/EP0475920A1/en
Application granted granted Critical
Publication of EP0475920B1 publication Critical patent/EP0475920B1/en
Anticipated expiration legal-status Critical
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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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/548—Specially 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
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
    • 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
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F05D2240/121—Fluid guiding means, e.g. vanes related to the leading edge of a stator vane

Definitions

  • This invention concerns a rotodynamic pump comprising an impeller rotating in a pump housing.
  • Such pumps may roughly be categorized as centrifugal pumps and axial pumps.
  • the centrifugal pump comprises an impeller consisting of a hub, at least one cover disc on said hub and a number of vanes, a so-called open impeller.
  • a closed impeller is provided with two cover discs and intermediate vanes. Common for the two types is that the liquid is sucked into the centre of the impeller in an axial direction and leaves it tangentially at the periphery.
  • the axial flow pump differs from the centrifugal pump in that the liquid leaves the pump in a substantially axial direction.
  • This linking of the fluid is taken care of by a number of vanes in the pump housing after the impeller. These vanes also normally serve as supporting elements in the housing construction.
  • FIG. 1 stands for an impeller hub provided with vanes 2.
  • 3 stands for a motor unit, 4 an annular channel, 5 pump housing and 6 vanes having leading edges 7 and bulbs 8.
  • the pump operates in the following way:
  • the rotating impeller vanes 2 suck the liquid through the annular channel 4.
  • the leading edge 7 of the vane 6 In order to diminish the risk that fibres and the like will clog on the leading edge 7 of the vane 6, the latter is designed strongly swept backwards, as seen in the direction of the flow, causing the fibres to slip outwards in the direction of the wall 5 of the pump housing where the velocity is the highest.
  • the vane is designed with a bulb 8 having increased thickness towards the wall 6 and with decreasing thickness towards the trailing edge of the vane. In this way the fibres easily slip over the edge of the vane and the bulb has only a slight influence on the flow as a whole.
  • said part In order to prevent solid material from getting stuck in the transition between leading edge 7 and wall 5, said part is designed with a radius and no sharp corners.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Power Steering Mechanism (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Glass Compositions (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The invention concerns a non-clogging pump of centrifugal or axial flow type.
The vanes (6) of the pump housing (5) are designed with strongly back swept leading edges (7) as seen in the direction of the flow, the vanes (6) being given a bulb form in the outward direction.

Description

  • This invention concerns a rotodynamic pump comprising an impeller rotating in a pump housing. Such pumps may roughly be categorized as centrifugal pumps and axial pumps.
  • The centrifugal pump comprises an impeller consisting of a hub, at least one cover disc on said hub and a number of vanes, a so-called open impeller. A closed impeller is provided with two cover discs and intermediate vanes. Common for the two types is that the liquid is sucked into the centre of the impeller in an axial direction and leaves it tangentially at the periphery.
  • The axial flow pump differs from the centrifugal pump in that the liquid leaves the pump in a substantially axial direction. This linking of the fluid is taken care of by a number of vanes in the pump housing after the impeller. These vanes also normally serve as supporting elements in the housing construction.
  • When pumping sewage water and certain types of process water containing elongated fibres, the pumping may be disturbed by rags, fibres etc getting stuck to the front edges of the vanes on the impeller and in the pump housing. Such build-ups can initially create vibrations in the pump, consequently the efficiency decreases and finally the pump might get totally clogged. One way to make the objects leave the vanes is to let the pump rotate backwards at certain intervals, but this is of course not an acceptable solution. Another way to diminish the clogging risk is to provide the pump with cutting means which divide the pollutions into pieces before they are sucked into the impeller. An example of such a solution is shown in the Swedish Pat No 820 5774-6. A disadvantage with this solution is that the cutting means may be quickly worn-out which might cause the clogging problem to become even worse.
  • The purpose of this invention is to solve the clogging problems mentioned above in a totally new and different way. The solution is obtained by help of the device stated in the claims.
  • The invention is described more closely below with reference to the enclosed drawings which show an axial and a meridian cut through an axially flow pump.
  • In the drawings 1 stands for an impeller hub provided with vanes 2. 3 stands for a motor unit, 4 an annular channel, 5 pump housing and 6 vanes having leading edges 7 and bulbs 8.
  • The pump operates in the following way:
    The rotating impeller vanes 2 suck the liquid through the annular channel 4. When the liquid has passed said vanes it is linked by the vanes 6 for obtaining pressure energy.
  • In order to diminish the risk that fibres and the like will clog on the leading edge 7 of the vane 6, the latter is designed strongly swept backwards, as seen in the direction of the flow, causing the fibres to slip outwards in the direction of the wall 5 of the pump housing where the velocity is the highest. In addition, the vane is designed with a bulb 8 having increased thickness towards the wall 6 and with decreasing thickness towards the trailing edge of the vane. In this way the fibres easily slip over the edge of the vane and the bulb has only a slight influence on the flow as a whole. In order to prevent solid material from getting stuck in the transition between leading edge 7 and wall 5, said part is designed with a radius and no sharp corners.
  • By help of the invention is obtained a device which considerably diminishes the risk for clogging in pumps operating with liquids containing fibres, rugs etc.

Claims (4)

  1. A pump of axial flow type for pumping liquids containing pollutions such as elongated fibres, which pump comprises a motor (3) driving a rotary impeller (1) both surrounded by an essentially pipe formed pump housing (5) which supports the motor housing by help of a number of attaching means (6) arranged downstream of the impeller (1), said attaching means also serving as vanes for the liquid, characterized in that the leading edges (7) of the vanes (6) are swept backwards as seen in the direction of the flow, meaning that their respective attachments to the pump housing (5) are situated downstream of their respective attachments to the motor housing (3), said leading edges (7) being designed with a successively increasing thickness into a bulb form in the direction of the pump housing (5).
  2. A pump according to claim 1, characterized in that the thickness increase of the vanes (6) is obtained by rounding of their respective pressure and suction sides.
  3. A pump according to claim 2, characterized in that the rounding of the pressure side of the vane (6) is abruptly cut off at a distance from the attachment in the pump housing (5).
  4. A pump according to claim 1, characterized in that the transition between the leading edge (7) of the vane (6) and the pump housing wall (5) is formed with a radius thus obtaining a smooth line without sharp edges.
EP91850194A 1990-09-12 1991-08-14 Clog resistant pump Expired - Lifetime EP0475920B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002898 1990-09-12
SE9002898A SE466768B (en) 1990-09-12 1990-09-12 AXIAL TYPE RELEASED PUMP

Publications (2)

Publication Number Publication Date
EP0475920A1 true EP0475920A1 (en) 1992-03-18
EP0475920B1 EP0475920B1 (en) 1995-07-19

Family

ID=20380333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91850194A Expired - Lifetime EP0475920B1 (en) 1990-09-12 1991-08-14 Clog resistant pump

Country Status (6)

Country Link
EP (1) EP0475920B1 (en)
JP (1) JPH0730751B2 (en)
AT (1) ATE125335T1 (en)
AU (1) AU645341B2 (en)
DE (1) DE69111345T2 (en)
SE (1) SE466768B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4314477A1 (en) * 1993-05-03 1994-11-10 Klein Schanzlin & Becker Ag Centrifugal pump of axial design
EP0651163A1 (en) * 1993-10-28 1995-05-03 KSB Aktiengesellschaft Flow guiding apparatus for centrifugal pumps
DE4433066A1 (en) * 1994-09-16 1996-03-21 Klein Schanzlin & Becker Ag Centrifugal axial pump with semi=axial inlet nozzles
EP0733805A1 (en) * 1995-03-24 1996-09-25 KSB Aktiengesellschaft Fibres repelling wall-shape design
US5562405A (en) * 1994-03-10 1996-10-08 Weir Pumps Limited Multistage axial flow pumps and compressors
US5755554A (en) * 1995-12-22 1998-05-26 Weir Pumps Limited Multistage pumps and compressors
WO1998026176A1 (en) * 1996-12-12 1998-06-18 Andreas Keller Water turbine or water pump
US9651050B2 (en) 2011-12-13 2017-05-16 Xylem Ip Holdings Llc Propeller pump and pump station

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE475984C (en) * 1928-02-26 1929-05-04 Wilhelm Schulz Dr Ing Blade shape for propeller and screw pumps
US4640666A (en) * 1982-10-11 1987-02-03 International Standard Electric Corporation Centrifugal pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE475984C (en) * 1928-02-26 1929-05-04 Wilhelm Schulz Dr Ing Blade shape for propeller and screw pumps
US4640666A (en) * 1982-10-11 1987-02-03 International Standard Electric Corporation Centrifugal pump

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4314477A1 (en) * 1993-05-03 1994-11-10 Klein Schanzlin & Becker Ag Centrifugal pump of axial design
US5634769A (en) * 1993-10-28 1997-06-03 Ksb Aktiengesellschaft Guide apparatus for centrifugal pumps
EP0651163A1 (en) * 1993-10-28 1995-05-03 KSB Aktiengesellschaft Flow guiding apparatus for centrifugal pumps
US5562405A (en) * 1994-03-10 1996-10-08 Weir Pumps Limited Multistage axial flow pumps and compressors
DE4433066A1 (en) * 1994-09-16 1996-03-21 Klein Schanzlin & Becker Ag Centrifugal axial pump with semi=axial inlet nozzles
DE4433066C2 (en) * 1994-09-16 2002-08-01 Ksb Ag Semi-axial inlet nozzles for axial pumps
EP0733805A1 (en) * 1995-03-24 1996-09-25 KSB Aktiengesellschaft Fibres repelling wall-shape design
US5785495A (en) * 1995-03-24 1998-07-28 Ksb Aktiengesellschaft Fiber-repellant centrifugal pump
CN1070583C (en) * 1995-03-24 2001-09-05 Ksb股份公司 Removing wall structure of fiber
DE19510811A1 (en) * 1995-03-24 1996-09-26 Klein Schanzlin & Becker Ag Fiber-repellent wall surface design
US5755554A (en) * 1995-12-22 1998-05-26 Weir Pumps Limited Multistage pumps and compressors
WO1998026176A1 (en) * 1996-12-12 1998-06-18 Andreas Keller Water turbine or water pump
US9651050B2 (en) 2011-12-13 2017-05-16 Xylem Ip Holdings Llc Propeller pump and pump station

Also Published As

Publication number Publication date
SE9002898D0 (en) 1990-09-12
ATE125335T1 (en) 1995-08-15
SE9002898A (en) 1992-03-13
DE69111345D1 (en) 1995-08-24
AU8361091A (en) 1992-03-19
JPH04279795A (en) 1992-10-05
AU645341B2 (en) 1994-01-13
SE466768B (en) 1992-03-30
JPH0730751B2 (en) 1995-04-10
EP0475920B1 (en) 1995-07-19
DE69111345T2 (en) 1996-03-07

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