EP1258635B1 - Pumpenlaufrad - Google Patents

Pumpenlaufrad Download PDF

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Publication number
EP1258635B1
EP1258635B1 EP02076680A EP02076680A EP1258635B1 EP 1258635 B1 EP1258635 B1 EP 1258635B1 EP 02076680 A EP02076680 A EP 02076680A EP 02076680 A EP02076680 A EP 02076680A EP 1258635 B1 EP1258635 B1 EP 1258635B1
Authority
EP
European Patent Office
Prior art keywords
flow channel
impeller
channel
pump impeller
impeller according
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.)
Expired - Lifetime
Application number
EP02076680A
Other languages
English (en)
French (fr)
Other versions
EP1258635A1 (de
Inventor
Lasse Ilves
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.)
Grundfos Management AS
Original Assignee
Grundfos Management AS
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 Grundfos Management AS filed Critical Grundfos Management AS
Publication of EP1258635A1 publication Critical patent/EP1258635A1/de
Application granted granted Critical
Publication of EP1258635B1 publication Critical patent/EP1258635B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/2238—Special flow patterns
    • F04D29/225—Channel wheels, e.g. one blade or one flow channel

Definitions

  • the present invention relates to an impeller for a pump used for pumping liquid substances, such as waste water, said impeller containing at least one flow channel of a spatially curved shape.
  • Prior-art impellers of centrifugal pumps designed for the pumping of liquids have a shield and a hub of a rotationally symmetrical structure and between them one or more blades of e.g. a spiral shape, serving to form one or more spatially curved flow channels in the impeller.
  • waste waters In addition to waste liquids, waste waters also contain solid waste, such as pieces of cloth and other solid bodies. In the pumping of waste water, these solid pieces cause interruptions in operation as well as power losses in the pumps because they may stick to the blades of the pump impeller or accumulate as lumps inside the impeller. For this reason, the flow channels of the impellers of waste water pumps are often so implemented that they have a large cross-sectional area to allow especially large solid bodies to pass through the channel without clogging the pump. Also, to achieve a more effective flow and to reduce the risk of clogging, the impeller blade may also be so shaped that it has a larger thickness in the middle than at the ends. Such an impeller is disclosed e.g. in SE specification 426976. It is also possible sharpen the leading edge of the impeller so that it will cut solid bodies of waste present in the waste water into smaller pieces, as described e.g. in US patent 4,347,035.
  • the liquid flowing into the impeller meets upon entering the impeller the edge of a blade and is divided into two separate liquid flows on opposite sides of the blade. This causes extra work and at the same time extra power consumption. In addition, pieces of solid waste may stick to the edge of the blade.
  • GB 687 514 discloses an impeller for centrifugal pumps having a flow channel comprising a first axial part parallel to the suction inlet and a second transverse part in the plane of the outlet channel. Between these two parts the channel has a bend.
  • the channel does not meet itself.
  • the flow channel does not meet itself but another object, the periphery of the impeller, instead.
  • Prior-art impellers have a relatively poor efficiency, and additionally pieces of solid waste may cause interruptions in operation and power losses.
  • the object of the invention is to eliminate the drawbacks of prior-art solutions and to achieve a completely new type of impeller for a pump used e.g. for the pumping of waste water, making it possible to achieve a simple construction and a substantially better efficiency than in prior-art impellers.
  • the structure of the pump impeller of the invention is based on the idea that, in the design of the pump impeller of the invention, instead of defining the shape of the blade between the shield and the hub as in the design of prior-art impellers, the shape of the flow channel is defined. This can be done by defining a spatially curved line, along which the cross-section is varied.
  • the impeller of the invention has a uniformly continuous structure; in other words, it has no actual blade structure at all.
  • the flow channel has an evenly curved shape, i.e. it has no abrupt bends due to blades or the like, and, unlike prior-art flow channels, at its end the flow channel meets itself or, in the case of an impeller with several channels, another channel, a structure resembling the trailing edge of a blade being formed at this meeting point.
  • the cross-section of the channel remains constant or changes evenly without any sharp changes in shape and/or cross-sectional area.
  • FIGS 1 - 4 present an impeller according to the invention for a centrifugal pump, especially one intended for the pumping of waste water.
  • the impeller has a cast-metal body 1 provided with a spatially curved flow channel 2. At the upper end of the body 1 there is a circular suction port 3 of a size corresponding to the diameter of an intake waste water pipe, through which port the waste water is passed in from the waste water pipe.
  • the impeller is provided with a hole 4 for a drive shaft going through it.
  • the shape of the flow channel 2 is defined. This is done by giving a line 5 (dotted broken line) spatially curved in the direction of flow, along which is carried a constant or slowly changing cross-section A.
  • the cross-section A may be of a circular form as in Fig. 4. Advancing along the curved line 5, the edge of the cross-section defines the edges 6 (broken line) of the flow channel 2 and also those of an imaginary extension of it as presented in the drawings.
  • the curved line 5 may be a spiral line such that it has at first a vertical portion at the center of the suction port 3, running in the direction of the center axis of the impeller, whereafter it begins to bend spatially into a spiral form. In the final portion of the channel, the curve forms a planar spiral.
  • the line 5 has a spatial curvature, differing in this respect from planar curves.
  • its curvature is gentle and continuous, i.e. its radius of curvature remains at least approximately the same all the time, so there are no sharp bends in the channel.
  • the form and area of the cross-section A of the channel may change evenly and continuously. Thus, the waste water flows continuously in the direction of the channel.
  • the body 1 has a uniformly continuous structure without separate structures, such as shield, hub or blade structures.
  • Fig. 5 presents another impeller according to the invention, designed especially for a centrifugal pump intended for the pumping of waste water. It has a cast-metal body containing a flow channel 12 spatially curved as in the case of Fig. 1 - 4. At the upper end of the body there is a circular suction port 13 of a size corresponding to the diameter of an intake waste water pipe, through which port the waste water is passed from the waste water pipe.
  • the impeller is provided with a through hole for a drive shaft.
  • the cross-section A1 of the flow channel changes from a substantially circular form to a form such that the outer wall 14 of the flow channel is substantially straight at the point where the channel meets itself, so the cross-section of the channel has the shape of letter D (see Fig. 5), whereafter the inner edge 15 also begins to straighten out, being also straight at the end of the channel, the cross-section of the channel thus having a rectangular form.

Landscapes

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

Claims (8)

  1. Pumpenlaufrad für eine zum Pumpen von flüssigen Substanzen, wie beispielsweise Abwasser, verwendete Pumpe, wobei das Pumpenlaufrad wenigstens einen Strömungskanal (2, 12) mit einer räumlich gekrümmten Form enthält, wobei der Strömungskanal von gleichmäßig gekrümmter Form ist,
    dadurch gekennzeichnet,
    dass in dem abschließenden Abschnitt des Kanals der Strömungskanal (2, 12) sich selbst oder sofern das Pumpenlaufrad mehr als einen Strömungskanal besitzt einen anderen Kanal trifft.
  2. Pumpenlaufrad nach Anspruch 1,
    dadurch gekennzeichnet,
    dass der Krümmungsradius des Strömungskanals im Wesentlichen konstant ist oder sich gleichmäßig verändert.
  3. Pumpenlaufrad nach Anspruch 1,
    dadurch gekennzeichnet,
    dass die Form des Strömungskanals (2) in der Strömungsrichtung auf der Grundlage einer räumlich gekrümmten Linie (5) festgelegt wird, und
    dass die Kante des Querschnittes die Kanten (6) des Strömungskanals (2) begrenzt, wenn dieser sich längs der gekrümmten Linie fortsetzt.
  4. Pumpenlaufrad nach Anspruch 1,
    dadurch gekennzeichnet,
    dass die gekrümmte Linie (5) eine zumindest im Wesentlichen spiralförmige Form besitzt.
  5. Pumpenlaufrad nach Anspruch 1,
    dadurch gekennzeichnet,
    dass die Struktur gleichmäßig, kontinuierlich ohne separate Strukturen, wie beispielsweise Schild-, Naben- und/oder Lamellenstrukturen ist.
  6. Pumpenlaufrad nach Anspruch 1,
    dadurch gekennzeichnet,
    dass der Querschnitt (A, A1) des Strömungskanals konstant ist oder sich gleichmäßig ändert.
  7. Pumpenlaufrad nach Anspruch 6,
    dadurch gekennzeichnet,
    dass der Querschnitt des Strömungskanals sich von einer im Wesentlichen kreisförmigen Form in eine Form derart ändert, dass zumindest eine Außenwand (14) des Strömungskanals in dem abschließenden Abschnitt im Wesentlichen gradlinig ist.
  8. Pumpenlaufrad nach Anspruch 6 oder 7,
    dadurch gekennzeichnet,
    dass eine innere Wand (15) des Strömungskanal ebenfalls in dem abschließenden Abschnitt des Strömungskanals im Wesentlichen geradlinig ist, insbesondere am Ende des Strömungskanals, sodass der Querschnitt des Strömungskanals in seinem abschließenden Abschnitt im Wesentlichen rechtwinklig ist.
EP02076680A 2001-04-27 2002-04-29 Pumpenlaufrad Expired - Lifetime EP1258635B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20010887A FI110275B (fi) 2001-04-27 2001-04-27 Pumpun juoksupyörä
FI20010887 2001-04-27

Publications (2)

Publication Number Publication Date
EP1258635A1 EP1258635A1 (de) 2002-11-20
EP1258635B1 true EP1258635B1 (de) 2006-05-31

Family

ID=8561081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02076680A Expired - Lifetime EP1258635B1 (de) 2001-04-27 2002-04-29 Pumpenlaufrad

Country Status (5)

Country Link
EP (1) EP1258635B1 (de)
AT (1) ATE328203T1 (de)
DE (1) DE60211797T2 (de)
ES (1) ES2266401T3 (de)
FI (1) FI110275B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2930367B1 (de) 2013-07-05 2020-05-27 Ebara Corporation Pumpenklinge für eine unterwasserpumpe und tauchpumpe damit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4713066B2 (ja) 2003-07-18 2011-06-29 新明和工業株式会社 羽根車及びそれを備えた汚水処理用ポンプ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB687514A (en) * 1950-08-15 1953-02-18 Fairbanks Morse & Co Improvements in impellers for centrifugal pumps
DE3211230A1 (de) * 1982-03-26 1983-09-29 Paul Pleiger Maschinenfabrik, 5810 Witten Kreiselpumpe, insbesondere fuer schmutz- und abwasser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2930367B1 (de) 2013-07-05 2020-05-27 Ebara Corporation Pumpenklinge für eine unterwasserpumpe und tauchpumpe damit

Also Published As

Publication number Publication date
FI20010887A (fi) 2002-10-28
FI20010887A0 (fi) 2001-04-27
DE60211797T2 (de) 2007-05-16
ATE328203T1 (de) 2006-06-15
EP1258635A1 (de) 2002-11-20
ES2266401T3 (es) 2007-03-01
DE60211797D1 (de) 2006-07-06
FI110275B (fi) 2002-12-31

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