EP1716337A1 - Cutting tool pertaining to a centrifugal pump - Google Patents

Cutting tool pertaining to a centrifugal pump

Info

Publication number
EP1716337A1
EP1716337A1 EP05700789A EP05700789A EP1716337A1 EP 1716337 A1 EP1716337 A1 EP 1716337A1 EP 05700789 A EP05700789 A EP 05700789A EP 05700789 A EP05700789 A EP 05700789A EP 1716337 A1 EP1716337 A1 EP 1716337A1
Authority
EP
European Patent Office
Prior art keywords
cutting
unit according
cutting unit
pump
openings
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
EP05700789A
Other languages
German (de)
French (fr)
Other versions
EP1716337B1 (en
Inventor
Manfred Zelder
Michael Müller
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.)
Wilo SE
Original Assignee
Wilo AG
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 Wilo AG filed Critical Wilo AG
Priority to PL05700789T priority Critical patent/PL1716337T3/en
Publication of EP1716337A1 publication Critical patent/EP1716337A1/en
Application granted granted Critical
Publication of EP1716337B1 publication Critical patent/EP1716337B1/en
Active legal-status Critical Current
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
    • 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

  • the invention relates to a cutting unit of a centrifugal pump for liquids loaded with solids, wherein the cutter has a rotating cutting body with at least one flowed through by the liquid, forming a cutting opening and the cutting body faces with a side surface of a rotationally fixed counter surface, which also at least one of the Having liquid flowed through opening.
  • the object of the invention is to improve a cutting unit of a centrifugal pump so HU that low wear occurs at high cutting performance.
  • Such a cutting unit has a low wear, as the surfaces can slide past each other. This also ensures that the cutting unit and the pump will not clog and in particular elongated foreign body does not wrap around the cutting body and the impeller. For safe storage, such a cutting unit and thus provided centrifugal pump are easy to manufacture and assembly.
  • FIG. 2 shows a side view of the rotating cutting body according to FIG. 1, FIG.
  • FIG. 3 is a perspective view of the rotating cutting body on a smaller scale
  • Fig. 5 is a perspective view of the non-rotatable body in a smaller scale.
  • FIG. 6 is an axial section through the cutting unit of a second embodiment, 7 is a side view of the rotating cutting body of FIG. 6,
  • FIG. 8 is a perspective view of the rotary cutting body of FIG. 7,
  • Fig. 10 is a perspective view of the rotatable body of the second embodiment on a smaller scale.
  • the cutting unit 1 of a centrifugal motor pump has a rotating cutting body 2, which is attached to the side of the pump impeller, which faces away from the electric motor.
  • the cutting body 2 is cup-shaped and its upper edge surrounds the bush-shaped inlet opening of the impeller.
  • the upper edge 3 preferably has an internal thread 4, or a press fit, with which it can be screwed or pressed onto the external thread or cylindrical receptacle of the impeller inlet opening.
  • the bottom of the cutting body 2 has three inlet openings 5 which are separated from one another by webs 6, to which radial cutting edges 7 are fastened, in particular molded.
  • the blades 7 thus form an angle of 120 degrees with each other.
  • the inlet openings 5 are formed at an angle to the direction of rotation and thus obliquely to the axis of rotation, so that the cutting body 2 acts as an "axial impeller".
  • the underside and thus the side facing away from the impeller of the cutting body 2 forms a convexly curved side surface 8, wherein the side surface is formed by a part of a spherical surface, so that the cutting body 2 forms a spherical cap or dome in the region facing away from the impeller.
  • the side surface 8 are the cutting edges of the blades 7, so that they are correspondingly curved.
  • the radius R of the side surface 8 is with his Side surface 8 facing away from the axis of the pump shaft at the level of the pump shaft bearing, which is adjacent to the pump impeller.
  • the rotatable body 10 shown in FIGS. 4 and 5 has five sector-shaped flow openings 12 which cooperate with their edges with the cutting edges 7.
  • the cross sections of the flow openings 12 are larger in the second embodiment on the side facing away from the impeller than on the side facing away from the impeller. As a result, a safe promotion puffy solids is guaranteed in particular of hygiene articles.
  • the rotationally fixed body 10 is provided centrally between the flow openings 12 with a suction cap 13, similar to a rotor cap (FIGS. 6 and 7), which prevents clogging of the cutting unit even before the cutting plane.
  • a suction cap 13 similar to a rotor cap (FIGS. 6 and 7)
  • solids, in particular textiles are fed to the throughflow openings, instead of lying in the center between the flow openings in front of the non-rotatable body.
  • the peripheral circular body 10 is mounted in an annular flange 11 which is fixed in the pump housing, in particular screwed.
  • Body 10 and flange 11 may also be made in one piece.

Landscapes

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

Abstract

The invention relates to a cutting tool pertaining to a centrifugal pump for liquids loaded with solids. Said cutting tool comprises a rotating cutting body comprising at least one opening forming a cutting edge and through which the liquid flows, the lateral surface of the cutting body facing the rotationally fixed opposite surface that also comprises at least one opening through which the liquid flows. The lateral surface of the cutting body, facing the opposite surface, is curved in a convex manner, and the opposite surface is curved in a correspondingly concave manner.

Description

. 10.01.05 CO/Cu 640034WO B , 10.01.05 CO / Cu 640034WO B
WILO AGWILO AG
Nortkirchenstraße 100 D 44263 DortmundNortkirchenstraße 100 D 44263 Dortmund
Schneidwerk einer KreiselpumpeCutting unit of a centrifugal pump
Die Erfindung betrifft ein Schneidwerk einer Kreiselpumpe für mit Feststoffen belastete Flüssigkeiten, wobei das Schneidwerk einen rotierenden Schneidkörper mit mindestens einer von der Flüssigkeit durchströmten, eine Schneide bildende Öffnung aufweist und der Schneidkörper mit einer Seitenfläche einer drehfesten Gegenfläche zugewandt ist, die gleichfalls mindestens eine von der Flüssigkeit durchströmte Öffnung aufweist.The invention relates to a cutting unit of a centrifugal pump for liquids loaded with solids, wherein the cutter has a rotating cutting body with at least one flowed through by the liquid, forming a cutting opening and the cutting body faces with a side surface of a rotationally fixed counter surface, which also at least one of the Having liquid flowed through opening.
Es ist bekannt, das Laufrad einer Kreiselpumpe eingangsseitig mit einem Schneidwerk zu versehen, um in der geförderten Flüssigkeit enthaltene Feststoffe zu zerkleinern, so dass die Pumpe und nachfolgende Rohre und Vorrichtungen nicht verstopfen können. Bei diesen Kreiselpumpen ist die Laufradwelle üblicherweise nur im Bereich des Antriebsmotors gelagert, so dass das Schneidwerk bei der Zerkleinerungsarbeit um das Wellenlager schwingt, das dem Pumpenlaufrad nahe ist. Zusätzlich wirkt beim Betrieb von Kreiselpumpen eine radiale Kraft auf das Laufrad, welche die Laufradwelle auf Wechselbiegung belastet. Hierdurch kommt es zumindest zwischen der äußeren Seitenfläche des rotierenden Schneid körpers und der Gegenfläche des anliegenden, drehfesten Körpers als auch häufig an der Peripherie zu Reibungen und damit zu einem vorzeitigen Verschleiß. An der der Reibstelle in Umfangsrichtung gegenüber liegenden Seite entsteht gleichzeitig eine Spaltvergrößerung und damit die erhöhte Gefahr von Verstopfung durch nicht zerschnittene Feststoffe. Aufgabe der Erfindung ist es, ein Schneidwerk einer Kreiselpumpe so HU verbessern, dass bei hoher Schneidleistung ein geringer Verschleiß auftritt.It is known to provide the impeller of a centrifugal pump on the input side with a cutting unit in order to comminute solids contained in the conveyed liquid, so that the pump and subsequent pipes and devices can not clog. In these centrifugal pumps, the impeller shaft is usually mounted only in the region of the drive motor, so that the cutting unit swings in the comminution work around the shaft bearing, which is close to the pump impeller. In addition, during operation of centrifugal pumps acts a radial force on the impeller, which loads the impeller shaft to alternating bending. As a result, it comes at least between the outer side surface of the rotating cutting body and the opposite surface of the adjacent, rotationally fixed body and often on the periphery to friction and thus premature wear. At the friction point in the circumferential direction opposite side simultaneously creates a gap enlargement and thus the increased risk of clogging by not cut solids. The object of the invention is to improve a cutting unit of a centrifugal pump so HU that low wear occurs at high cutting performance.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die der Gegenfläche zugewandte Seitenfläche des Schneidkörpers konvex und die Gegenfläche entsprechend konkav gewölbt sind.This object is achieved in that the counter surface facing side surface of the cutting body convex and the counter surface are correspondingly concave.
Ein solches Schneidwerk weist einen geringen Verschleiß auf, da die Flächen aneinander vorbei gleiten können. Hierbei ist auch sichergestellt, dass das Schneidwerk und die Pumpe nicht verstopfen und insbesondere längliche Fremdkörper sich nicht um den Schneidkörper und das Laufrad wickeln. Bei sicherer Lagerung sind ein solches Schneidwerk und eine damit versehene Kreiselpumpe einfach in Herstellung und Montage.Such a cutting unit has a low wear, as the surfaces can slide past each other. This also ensures that the cutting unit and the pump will not clog and in particular elongated foreign body does not wrap around the cutting body and the impeller. For safe storage, such a cutting unit and thus provided centrifugal pump are easy to manufacture and assembly.
Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen aufgeführt.Advantageous embodiments of the invention are listed in the subclaims.
Zwei Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Es zeigenTwo embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it
Fig. 1 einen axialen Schnitt durch das Schneidwerk einer ersten Ausführung,1 shows an axial section through the cutting unit of a first embodiment,
Fig. 2 eine Seitenansicht des rotierenden Schneidkörpers nach Fig. 1 ,FIG. 2 shows a side view of the rotating cutting body according to FIG. 1, FIG.
Fig. 3 eine perspektivische Ansicht des rotierenden Schneidkörpers in kleinerem Maßstab,3 is a perspective view of the rotating cutting body on a smaller scale,
Fig. 4 eine Seitenansicht des drehfesten Körpers,4 is a side view of the non-rotatable body,
Fig. 5 eine perspektivische Ansicht des drehfesten Körpers in kleinerem Maßstab.Fig. 5 is a perspective view of the non-rotatable body in a smaller scale.
Fig. 6 einen axialen Schnitt durch das Schneidwerk einer zweiten Ausführung, Fig. 7 eine Seitenansicht des rotierenden Schneidkörpers nach Fig. 6,6 is an axial section through the cutting unit of a second embodiment, 7 is a side view of the rotating cutting body of FIG. 6,
Fig. 8 eine perspektivische Ansicht des rotierenden Schneid körpers nach Fig. 7,8 is a perspective view of the rotary cutting body of FIG. 7,
Fig. 9 eine Seitenansicht des drehfesten Körpers der zweiten Ausführung,9 is a side view of the rotationally fixed body of the second embodiment,
Fig. 10 eine perspektivische Ansicht des drehfesten Körpers der zweiten Ausführung in kleinerem Maßstab.Fig. 10 is a perspective view of the rotatable body of the second embodiment on a smaller scale.
Das Schneidwerk 1 einer Kreiselmotorpumpe weist einen rotierenden Schneidkörper 2 auf, der an der Seite des Pumpenlaufrades befestigt wird, die dem Elektromotor abgewandt ist. Der Schneidkörper 2 ist topfförmig ausgebildet und sein oberer Rand umgreift die buchsenförmige Eintrittsöffnung des Laufrades. Hierbei besitzt der obere Rand 3 vorzugsweise ein Innengewinde 4, oder eine Presspassung, mit dem es auf das Außengewinde oder zylindrische Aufnahme der Laufradeingangsöffnung aufschraubbar oder einpressbar ist.The cutting unit 1 of a centrifugal motor pump has a rotating cutting body 2, which is attached to the side of the pump impeller, which faces away from the electric motor. The cutting body 2 is cup-shaped and its upper edge surrounds the bush-shaped inlet opening of the impeller. Here, the upper edge 3 preferably has an internal thread 4, or a press fit, with which it can be screwed or pressed onto the external thread or cylindrical receptacle of the impeller inlet opening.
Der Boden des Schneidkörpers 2 weist drei Eintrittsöffnungen 5 auf, die voneinander durch Stege 6 getrennt sind, an denen radiale Schneiden 7 befestigt, insbesondere angeformt sind. Die Schneiden 7 bilden damit miteinander Winkel von 120 Grad.The bottom of the cutting body 2 has three inlet openings 5 which are separated from one another by webs 6, to which radial cutting edges 7 are fastened, in particular molded. The blades 7 thus form an angle of 120 degrees with each other.
Die Eintrittsöffnungen 5 sind unter einem Winkel zur Drehrichtung und damit schräg zur Drehachse ausgebildet, so dass der Schneidkörper 2 als „axiales Laufrad" wirkt.The inlet openings 5 are formed at an angle to the direction of rotation and thus obliquely to the axis of rotation, so that the cutting body 2 acts as an "axial impeller".
Die Unterseite und damit die dem Laufrad abgewandte Seite des Schneidkörpers 2 bildet eine konvex gewölbte Seitenfläche 8, wobei die Seitenfläche von einem Teil einer Kugelfläche gebildet wird, so dass der Schneidkörper 2 in dem dem Laufrad abgewandten Bereich eine Kugelkappe bzw. Kalotte bildet. In der Seitenfläche 8 liegen die Schneidkanten der Schneiden 7, so dass diese entsprechend gewölbt sind. Der Radius R der Seitenfläche 8 liegt mit seinem der Seitenfläche 8 abgewandten Ende auf der Achse der Pumpenwelle in Höhe des Pumpenwellenlagers, das dem Pumpenlaufrad benachbart ist.The underside and thus the side facing away from the impeller of the cutting body 2 forms a convexly curved side surface 8, wherein the side surface is formed by a part of a spherical surface, so that the cutting body 2 forms a spherical cap or dome in the region facing away from the impeller. In the side surface 8 are the cutting edges of the blades 7, so that they are correspondingly curved. The radius R of the side surface 8 is with his Side surface 8 facing away from the axis of the pump shaft at the level of the pump shaft bearing, which is adjacent to the pump impeller.
Der in den Fig. 4 und 5 dargestellte drehfeste Körper 10 weist fünf sektorförmige Durchflussöffnungen 12 auf, die mit ihren Kanten mit den Schneiden 7 zusammenarbeiten. Die Querschnitte der Durchflussöffnungen 12 sind in der zweiten Ausführung auf der dem Laufrad abgewandten Seite größer als auf der dem Laufrad abgewandten Seite. Hierdurch wird eine sichere Förderung bauschiger Feststoffe insbesondere von Hygieneartikeln gewährleistet.The rotatable body 10 shown in FIGS. 4 and 5 has five sector-shaped flow openings 12 which cooperate with their edges with the cutting edges 7. The cross sections of the flow openings 12 are larger in the second embodiment on the side facing away from the impeller than on the side facing away from the impeller. As a result, a safe promotion puffy solids is guaranteed in particular of hygiene articles.
An der Seitenfläche 8 liegt eine Gegenfläche 9 eines drehfesten Körpers 10 an, wobei der Körper 10 eine konkave Ausnehmung bildet, die entsprechend der Seitenfläche 8 geformt ist und damit denselben Radius R besitzt, wenn ein üblicherweise geringfügiger Abstand zwischen den Flächen 8 und 9 vernachlässigt wird.On the side surface 8 abuts a counter surface 9 of a rotationally fixed body 10, wherein the body 10 forms a concave recess which is formed corresponding to the side surface 8 and thus has the same radius R, when a usually small distance between the surfaces 8 and 9 is neglected ,
In der zweiten Ausführung ist der drehfeste Körper 10 mittig zwischen den Durchflussöffnungen 12 mit einer einer Rotorkappe ähnlichen, zur Saugseite vorstehenden Ansaugspitze 13 versehen (Fig. 6 und 7), die ein Verstopfen des Schneidwerks bereits vor der Schneidebene verhindert. Durch die Ansaugspitze werden Feststoffe insbesondere Textilien den Durchflussöffnungen zugeführt, anstatt sich im Zentrum zwischen den Durchflussöffnungen vor dem drehfesten Körper zu legen.In the second embodiment, the rotationally fixed body 10 is provided centrally between the flow openings 12 with a suction cap 13, similar to a rotor cap (FIGS. 6 and 7), which prevents clogging of the cutting unit even before the cutting plane. Through the suction tip, solids, in particular textiles, are fed to the throughflow openings, instead of lying in the center between the flow openings in front of the non-rotatable body.
Der am Rand kreisrunde Körper 10 ist in einem ringförmigen Flansch 11 befestigt, der im Pumpengehäuse befestigt, insbesondere angeschraubt wird. Körper 10 und Flansch 11 können aber auch einteilig ausgeführt sein. The peripheral circular body 10 is mounted in an annular flange 11 which is fixed in the pump housing, in particular screwed. Body 10 and flange 11 may also be made in one piece.

Claims

10.01.05 CO/Cu 640034 CAnsprüche 10.01.05 CO / Cu 640034 CAprinciples
1. Schneidwerk (1 ) einer Kreiselpumpe für mit Feststoffen belastete Flüssigkeiten, wobei das Schneidwerk einen rotierenden Schneidkörper (2) mit mindestens einer von der Flüssigkeit durchströmten, eine Schneide bildende Öffnung (5) aufweist und der Schneidkörper mit einer Seitenfläche (8) einer drehfesten Gegenfläche (9) zugewandt ist, die gleichfalls mindestens eine von der Flüssigkeit durchströmte Öffnung (12) aufweist, dadurch gekennzeichnet, dass die der Gegenfläche (9) zugewandte Seitenfläche (8) des Schneidkörpers (2) konvex und die Gegenfläche (9) entsprechend konkav gewölbt sind.1. Cutting unit (1) of a centrifugal pump for liquids loaded with solids, wherein the cutting mechanism comprises a rotating cutting body (2) with at least one of the liquid flowed through, forming a cutting edge opening (5) and the cutting body with a side surface (8) of a rotationally fixed Facing counter surface (9), which also has at least one of the liquid flowed through opening (12), characterized in that the counter surface (9) facing side surface (8) of the cutting body (2) convex and the counter surface (9) correspondingly concave are arched.
2. Schneidwerk nach Anspruch 1, dadurch gekennzeichnet, dass die Wölbung des Schneidkörpers (2) eine Kugelkappe (Kalotte) bildet.2. Cutting unit according to claim 1, characterized in that the curvature of the cutting body (2) forms a spherical cap (dome).
3. Schneidwerk nach Anspruch 2, dadurch gekennzeichnet, dass das Ende des Radius (R) der Kugelkappe auf der Achse der Pumpenwelle in Höhe des Wellenlagers liegt, das dem Pumpenlaufrad nahe ist.3. Cutting unit according to claim 2, characterized in that the end of the radius (R) of the ball cap lies on the axis of the pump shaft in the amount of the shaft bearing, which is close to the pump impeller.
4. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der rotierende Schneidkörper (2) mit seiner der Gegenfläche (9) abgewandten Seite am Pumpenlaufrad befestigbar ist.4. Cutting unit according to one of the preceding claims, characterized in that the rotating cutting body (2) with its counter surface (9) facing away from the pump impeller can be fastened.
5. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Gegenfläche (9) von einem feststehenden Körper (10) gebildet ist, der im oder am Pumpengehäuse befestigbar oder vom Pumpengehäuse gebildet ist. ■ 5. Cutting unit according to one of the preceding claims, characterized in that the counter-surface (9) of a fixed body (10) is formed, which is fastened in or on the pump housing or formed by the pump housing. ■
6. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass sich die Durchflussöffnungen (12) in Fließrichtung verjüngen und damit nach außen hin erweitert sind.6. Cutting unit according to one of the preceding claims, characterized in that the flow openings (12) taper in the flow direction and are thus expanded outwards.
7. Schneidwerk nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass der feststehende Körper (10) in einem ringförmigen Flansch (11) einliegt, der im oder am Pumpengehäuse befestigbar ist.7. Cutting unit according to claim 5 or 6, characterized in that the fixed body (10) in an annular flange (11) rests, which can be fastened in or on the pump housing.
8. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der rotierende Schneidkörper (2) zwei bis vier, vorzugsweise drei sektorförmige Öffnungen (5) aufweist.8. Cutting unit according to one of the preceding claims, characterized in that the rotating cutting body (2) has two to four, preferably three sector-shaped openings (5).
9. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der feststehende Körper (10) vier bis sechs, vorzugsweise fünf sektorförmige Öffnungen (12) aufweist.9. Cutting unit according to one of the preceding claims, characterized in that the fixed body (10) has four to six, preferably five sector-shaped openings (12).
10. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Schneiden (7) von den insbesondere radialen Stegen (6) zwischen den Öffnungen (5) des Schneidkörpers (2) gebildet oder getragen sind.10. Cutting unit according to one of the preceding claims, characterized in that the cutting edges (7) of the particular radial webs (6) between the openings (5) of the cutting body (2) are formed or supported.
11. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass es eine zur Ausgangsseite hin vorstehende Ansaugspitze (13) zwischen den sektorförmigen Öffnungen (12) des feststehenden Körpers aufweist.11. Cutting unit according to one of the preceding claims, characterized in that it has a suction side projecting towards the output side (13) between the sector-shaped openings (12) of the fixed body.
12. Schneidwerk nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der rotierende Schneidkörper (2) durch die Ausbildung der Eintrittsöffnungen 5 unter einem Winkel zur Drehrichtung als weiteres axiales Laufrad wirkt. 12. Cutting unit according to one of the preceding claims, characterized in that the rotating cutting body (2) acts through the formation of the inlet openings 5 at an angle to the direction of rotation as a further axial impeller.
EP05700789A 2004-02-16 2005-01-11 Cutting tool pertaining to a centrifugal pump Active EP1716337B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05700789T PL1716337T3 (en) 2004-02-16 2005-01-11 Cutting tool pertaining to a centrifugal pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004007739A DE102004007739A1 (en) 2004-02-16 2004-02-16 Cutting tool for centrifugal pump, has convex lateral surface located opposite concave fixed counter surface
PCT/EP2005/000150 WO2005078286A1 (en) 2004-02-16 2005-01-11 Cutting tool pertaining to a centrifugal pump

Publications (2)

Publication Number Publication Date
EP1716337A1 true EP1716337A1 (en) 2006-11-02
EP1716337B1 EP1716337B1 (en) 2007-03-07

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US (1) US7520454B2 (en)
EP (1) EP1716337B1 (en)
CN (1) CN100434718C (en)
AT (1) ATE356294T1 (en)
DE (2) DE102004007739A1 (en)
DK (1) DK1716337T3 (en)
PL (1) PL1716337T3 (en)
WO (1) WO2005078286A1 (en)

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PL1716337T3 (en) 2007-07-31
WO2005078286A1 (en) 2005-08-25
DK1716337T3 (en) 2007-07-02
US7520454B2 (en) 2009-04-21
EP1716337B1 (en) 2007-03-07
ATE356294T1 (en) 2007-03-15
US20070164136A1 (en) 2007-07-19
DE102004007739A1 (en) 2005-08-25
CN1922403A (en) 2007-02-28
DE502005000456D1 (en) 2007-04-19
CN100434718C (en) 2008-11-19

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