EP2535589B1 - Pompe pour barre de coupe - Google Patents

Pompe pour barre de coupe Download PDF

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Publication number
EP2535589B1
EP2535589B1 EP12168833.7A EP12168833A EP2535589B1 EP 2535589 B1 EP2535589 B1 EP 2535589B1 EP 12168833 A EP12168833 A EP 12168833A EP 2535589 B1 EP2535589 B1 EP 2535589B1
Authority
EP
European Patent Office
Prior art keywords
cutting
impeller
cutting body
centrifugal pump
pump 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.)
Active
Application number
EP12168833.7A
Other languages
German (de)
English (en)
Other versions
EP2535589A2 (fr
EP2535589A3 (fr
Inventor
Christoph Jäger
Rolf Witzel
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.)
KSB SE and Co KGaA
Original Assignee
KSB SE and Co KGaA
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 KSB SE and Co KGaA filed Critical KSB SE and Co KGaA
Publication of EP2535589A2 publication Critical patent/EP2535589A2/fr
Publication of EP2535589A3 publication Critical patent/EP2535589A3/fr
Application granted granted Critical
Publication of EP2535589B1 publication Critical patent/EP2535589B1/fr
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0084—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage
    • B02C18/0092—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage for waste water or for garbage
    • 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
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2288—Rotors specially for centrifugal pumps with special measures for comminuting, mixing or separating

Definitions

  • the invention relates to a centrifugal pump with a pump rotor, which is arranged in a housing, wherein before the influx of the medium in an impeller at least one cutting unit is arranged with a cutting surface and a rotating cutting body, wherein the cutting surface and cutting body axially in the direction of the axis of rotation of the cutting body with a contact force against each other are braced and the cutting surface has openings through which the medium flows.
  • the cutting mechanism consists of a fixed part, the cutting surface and a rotating part, the cutting body.
  • circular, conical or cylindrical cutting surfaces can be used.
  • the cutting surfaces have openings through which the medium flows. Therefore, the cutting surfaces are also sometimes referred to as a cutting screen.
  • a flat or conical shape of the cutting surface is called an insert.
  • a cylindrical shape of the cutting surface is referred to as a cutting ring.
  • the rotating cutting body is arranged in front of and / or behind the cutting surface. He is also referred to as a cutting attachment.
  • the DE 196 43 729 A1 describes a device which is preferably used for conveying manure.
  • a slurry flow is fed into a calming room.
  • the slurry flow is diverted and enters an exit space.
  • a partition wall Between the calming room and the outlet room is a partition wall, wherein the slurry flow passes through a passage opening of the partition from the calming room in the outlet space.
  • a cutting element which at least partially covers the passage opening is arranged.
  • the cutting members of the cutting element are arranged on the side of the dividing wall facing the settling chamber, which forms the cutting unit together with the cutting element.
  • the cutting element is biased by a spring element against the partition wall. As a result, a contact force between the cutting element and the partition wall is generated.
  • a waste water pump which has a stationary cutting device and an axial cutting device and a radial cutting device, wherein axial cutting device and radial cutting device are arranged axially movable in front of an impeller on an impeller shaft.
  • the Axialschneid beautiful is urged by a coil spring in the direction of fixed cutting device.
  • the US 4,143,993 A discloses a submersible pump assembly for delivering sewage with an electric motor, a pump, and a housing having a suction port. Adjacent to the suction port, a crusher is disposed in the casing to chop sucked additives flowing through the suction port, the shredding device comprising a rotatable means for alternately retaining and rejecting the flow.
  • the US 4,569,638 A1 shows a pump wherein a further axially directed force which assists the seating of the sealing surface is provided by the hydraulic forces exerted on the impeller.
  • the cutting unit Since blockages lead to failure of the conveyor system, the cutting unit must always be fully functional. For cutting units with flat or conical cutting surfaces, the functionality can be restored at least limited by adjusting the cutting gap between stationary and rotating part of the cutting unit. Cutter with cylindrical cutting surface must be completely renewed.
  • Object of the present invention is to provide a device that is inexpensive and has a low susceptibility. In this case, a high and durable cutting action should be guaranteed.
  • This object is achieved in that the contact pressure is generated due to the rotation of the pump rotor.
  • the pump rotor consists of the drive shaft with all components mounted on it. During operation of the centrifugal pump, all components of the pump rotor rotate.
  • the components of the pump rotor include, among other things, the impeller and, in the case of a drive by means of an electric motor, the rotor of the electric motor.
  • the rotation of the pump rotor generates a contact force which acts axially in the direction of the axis of rotation of the cutting body.
  • the forces can be generated axially in the direction of the motor, as well as in the opposite direction.
  • the medium flows through the cutter and enters the rotating impeller of the centrifugal pump. There, the medium is accelerated by the rotating impeller on a circular path. Due to the effect of the centrifugal force, the medium flows from the axis of rotation radially outward into a collecting tube. In the impeller, the medium is brought to high speeds and thus has a high kinetic energy. The medium is braked in the manifold. A large part of the kinetic energy is converted into static pressure energy.
  • the delivery pressure of the medium presses the cutting surface against the cutting body.
  • the delivery pressure is passed to an annular piston.
  • the cutting surface is arranged axially displaceable.
  • the piston presses the cutting surface against the cutting body.
  • the delivery pressure presses the cutting body against the cutting surface.
  • the cutting body is preferably arranged axially displaceably on a piston. The delivery pressure generated due to the rotation of the pump rotor is transferred to the piston via a system of bores and grooves. In this way, the cutting body is pressed against the cutting surface.
  • the pump rotor and the cutting body are rotated together by a motor in rotation. It proves to be advantageous if the cutting body is connected to the drive shaft of the pump rotor, so that cutting body and pump rotor rotate at the same speed. In an advantageous variant of the invention, the cutting head is screwed to the drive shaft and / or the impeller for this purpose.
  • the contact force between the cutting body and cutting surface is effected by an axial displacement of the pump rotor relative to the housing.
  • the cutting head connected to the pump rotor presses on the cutting surface, whereby the contact force between the two arises.
  • Prerequisite is a storage that ensures axial mobility of the pump rotor. Only due to the rotation occurs an axial displacement of the pump rotor. When the pump is at a standstill, no contact force is applied.
  • Axial thrust refers to the resultant of all axial forces acting on the pump rotor.
  • the cutting mechanism assumes the role of a thrust bearing for supporting the axial thrust.
  • a variant for effecting an axial displacement of the pump rotor is that the impeller has a cover disk on one side and the axial displacement is produced in the direction of the opposite side on which the impeller is open or has a smaller cover disk.
  • the impeller has a cover disc on one side and on the other side is open, or has a smaller cover plate, a hydraulic axial thrust is generated, which leads to an axial displacement of the pump rotor.
  • the cutting body is connected to the pump rotor such that the cutting body presses on the cutting surface and in this way generates the contact force between the two.
  • Another variant for generating an axial displacement of the pump rotor is that the pump rotor is driven by an electric motor having an offset of the rotor to the stator.
  • the rotor core is offset by a certain length axially to the stator.
  • an electromagnetic train is generated, wherein the axial displacement counteracts the offset.
  • an impeller can be used, which is designed without cover plates and thus generates no or only a small hydraulic axial force.
  • the motor which drives the pump rotor a control device is assigned, which can run at an interval in the opposite direction of rotation impeller and cutter body. Run the blades of the cutting head with a preset contact pressure against a cutting surface, while the running cutting edges of the knife and the cutting edge are sharpened while the leading edges wear out. The regular change of the direction of rotation ensures that the cutting ability is maintained.
  • the housing is formed as an annular space housing symmetrical to the discharge nozzle axis.
  • a ring housing has a cross-section which remains constant along the circumference.
  • Fig. 1 shows a centrifugal pump, in which in a housing 1, a pump rotor 2 is arranged.
  • the pump rotor 2 includes, inter alia, an impeller 3, a drive shaft 4 and a rotor 5 of a motor 6.
  • the centrifugal pump has a cutting unit 7, which is arranged in the impeller 3 before the inflow of the medium.
  • the cutting unit 7 comprises a cutting surface 8 and a cutting body 9.
  • the cutting surface 8 is designed as a flat, circular cutting plate having openings 10 through which the medium flows.
  • the cutting body 9 is arranged in the embodiment in front of the cutting surface 8, viewed in the flow direction of the medium.
  • a contact force F between the cutting body 9 and the cutting surface 8 is generated due to the rotation of the pump rotor 2. As a result, knives 11 of the cutting body 9 are pressed against the cutting surface 8.
  • the cutting surface 8 is fixedly connected to the suction cover 12 of the housing 1 and therefore does not rotate.
  • a fastening element 13 preferably a screw
  • the cutting body 9 is connected to the impeller 3 and the drive shaft 4.
  • a motor 6 rotates the pump rotor 2 and the cutting body 9 together.
  • the cutting body 9 rotates at the same speed as the drive shaft 4 and the impeller. 3
  • the rotation of the pump rotor 2 causes an axial displacement of the pump rotor 2 relative to the housing 1, whereby the contact force F of the cutting body 9 is generated on the cutting surface 8.
  • the axial displacement of the pump rotor 2 is based on an axial thrust generated by the impeller 3.
  • the impeller 3 in the embodiment, a suction-side cover plate 14 and is open to the pressure side.
  • the axial displacement of the pump rotor 2 is generated in the direction of the opposite side of the cover plate 14, on which the impeller 3 is open. Characterized in that the impeller 3 is designed with suction side and motor side without cover plate 14, a hydraulic axial thrust arises, which points in the direction of the motor 6 and clamps the cutting unit 7.
  • the pump rotor 2 is mounted relative to the housing 1 by means of two radial bearings 15, 16.
  • the cutting unit 7 acts as a thrust bearing and prevents contact between pump rotor 2 and housing 1.
  • the rear radial bearing 16 serves as an emergency bearing by axial contact with the corresponding surface of the motor housing 17th
  • the motor housing 17 is shown only schematically. The housing division required for mounting was not shown for reasons of clarity.
  • the motor housing 17 surrounds the fixed stator 18 and the rotor 5 of the motor 6.
  • Fig. 2 shows a front view of a cutting unit 7.
  • the cutting body 9, which is also referred to as a cutting head, comprises four purely radially extending wings 30. Each wing 30 is provided with a radially extending blade 11. The knives 11 of the cutting body 9 are pressed against the cutting surface 8.
  • the cutting body 9 can be designed so that the cutting edges are formed directly on both sides of the wings 30. Such variants are in the FIGS. 7 to 10 shown.
  • the pressing force required for pressing the cutting body 9 F is generated due to the rotation of the pump rotor 2. At standstill of the pump rotor 2 and thus the cutting body no contact force F.
  • the contact force F acts axially in the direction of the axis of rotation of the cutting body 9.
  • the cutting body 9 is connected by means of a fastening means 13 with the pump rotor 2.
  • the cutting surface 8 is designed in the embodiment as a flat, circular cutting plate and has openings 10 through which the medium flows.
  • the openings 10 are distributed over the circumference of the cutting surface 8 in an inner and an outer ring.
  • the blades 30 of the cutting body 9 overlap the openings 10 during rotation, the blades 11 running against the cutting surface 8 with a contact force.
  • the running cutting edges of the blades 11 and the cutting surface 8 are sharpened, while the leading edges wear out.
  • a regular change of the direction of rotation ensures that the cutting ability is maintained.
  • the cutting body 9 is connected to the pump rotor 2.
  • the motor 6 rotates the pump rotor 2 and the cutter body 9 together. Both rotate at the same speed.
  • the motor 6 is associated with a control device which intermittently the pump rotor 2 with the cutting body 9 circulating in the opposite direction of rotation.
  • the impeller 3 runs in different directions of rotation.
  • the centrifugal pump according to the invention has a rotational direction-independent conveying characteristic.
  • Fig. 3 shows that the housing 1 is formed as an annular space housing. It is formed symmetrically to the discharge nozzle axis 20.
  • the impeller 3 is provided with a plurality of blades 19.
  • the impeller 3 has a purely radial blading. Characterized in that the blades 19 extend in a purely radial direction and the housing is formed symmetrically to the discharge nozzle axis 20, the centrifugal pump has a characteristic independent of the direction of rotation.
  • Fig. 4 shows a variant in which the rotation of the pump rotor 2 causes an axial displacement of the pump rotor 2 relative to the housing 1.
  • the contact force F of the cutting body 9 is generated on the cutting surface 8.
  • the axial displacement of the pump rotor 2 is effected by an electromagnetic train.
  • the motor 6, which drives the pump rotor 2 is an electric motor with a stator 18 and a rotor 5.
  • the stator 18 is also referred to as a stator pack.
  • the rotor 5 is also referred to as rotor package.
  • the rotor 5 has an offset L to the stator 18.
  • an electromagnetic train is generated, which causes an axial displacement of the pump rotor 2. Since the cutting body 9 is connected to the pump rotor 2, this leads to a contact force between the cutting body 9 and cutting surface. 8
  • Fig. 5 shows a centrifugal pump with a front of the influx of medium into the impeller 3 arranged cutting unit 7.
  • the cutting unit 7 has a fixed cutting surface 8, which is connected to the suction cover 12.
  • the rotating cutting body 9 is arranged behind the cutting surface 8, viewed in the flow direction of the medium.
  • This arrangement of the cutting body behind the cutting plate is in Fig. 6 shown as a plan view.
  • the medium with its solid components first flows through the openings 10. Thereafter a comminution of the solid components by the rotating cutting body 9 takes place, which sweeps over the openings 10 with its wings 19. Due to the rotation of the pump rotor 2, a contact force F between the cutting body 9 and the cutting surface 8, is generated.
  • the cutting body 9 is connected to the pump rotor 2.
  • the rotation of the pump rotor 2 causes an axial displacement of the pump rotor 2 relative to the housing 1, whereby the rotating cutting body 9 is pressed against the fixed cutting surface 8.
  • the axial displacement of the pump rotor 2 is effected by hydraulic axial thrust, which acts counter to the flow direction.
  • the impeller 3 on a pressure-side cover plate 14. The axial displacement takes place in the direction of the opposite side, at which the impeller 3 is open.
  • a delivery pressure of the medium is built up due to the rotation of the pump rotor 2.
  • the delivery pressure is passed to an annular piston 22, which presses the cutting surface 8 against the cutting body 9.
  • the reaction forces are dissipated by the bearing 15 in the housing 1.
  • Fig. 8 shows the non-rotatable and simultaneously axially displaceable connection between suction cover 12 and cutting surface 8.
  • the designed as a cutting plate cutting surface 8 is provided with molded lugs 23 which engage in grooves 24 in the suction cover 12.
  • the desired axial preload force can be adjusted by dimensioning the annular piston 22 or by the radial position of the bore 21. It is also possible to replace the annular piston 22 by a plurality of evenly distributed over the circumference of individual pistons with associated bore system. Also, the bore system 21 can be replaced by a bypass line, which directs the delivery pressure from the housing 1 at a suitable location.
  • Fig. 9 and Fig. 10 show an arrangement for generating a hydraulic force for clamping the cutting body 9 against the cutting surface 8.
  • the delivery pressure presses the cutting body 9 against the cutting surface 8.
  • the cutting edges are integrally formed on the wings 19 of the cutting body 9.
  • the cutting body 9 is arranged axially displaceable on a piston 26, wherein the contact force F is transmitted via the differential surface 27 on the cutting body 9.
  • the necessary pressure is removed via a system of holes and grooves 28 from the rear wheel side space 29 between the impeller 3 and housing 1.
  • the cutting body 9 is connected by the pin 25 with the impeller 3.
  • the cutting plate 8 is firmly connected to the suction cover 12.

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

Claims (10)

  1. Pompe centrifuge, pourvue d'un rotor de pompe (2), qui est placé dans un corps (1), à l'avant de l'afflux du milieu dans une turbine (3) étant placé au moins un dispositif de coupe (7) pourvu d'une surface coupante (8) et d'un organe de coupe (9) en rotation, la surface coupante (8) et l'organe de coupe (9) étant contraints axialement l'un contre l'autre dans la direction de l'axe de rotation de l'organe de coupe (9) avec une pression de contact (F) et la surface coupante (8) comportant des orifices (10) à travers lesquels s'écoule le milieu,
    caractérisée en ce que
    la pression de contact (F) est générée du fait de la rotation du rotor de pompe (2).
  2. Pompe centrifuge selon la revendication 1, caractérisée en ce que la pression de contact (F) est générée en ce que la pression de refoulement du milieu presse la surface coupante (8) contre l'organe de coupe (9).
  3. Pompe centrifuge selon la revendication 1 ou 2, caractérisée en ce que la pression de contact (F) est générée en ce que la pression de refoulement du milieu presse l'organe de coupe (9) contre la surface coupante (8).
  4. Pompe centrifuge selon la revendication 1, 2 ou 3, caractérisée en ce que l'organe de coupe (9) est relié avec le rotor de pompe (2), un moteur (6) amenant en commun le rotor de pompe (2) et l'organe de coupe (9) en rotation.
  5. Pompe centrifuge selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la rotation provoque un déplacement axial du rotor de pompe (2) par rapport au corps (1) et génère de ce fait la pression de contact (F) de l'organe de coupe (9) sur la surface coupante (8).
  6. Pompe centrifuge selon la revendication 5, caractérisée en ce que sur un côté, la turbine (3) comporte une plaque de recouvrement (14) et le déplacement axial est généré dans la direction du côté opposé sur lequel la turbine (3) est ouverte ou comporte une plaque de recouvrement plus petite.
  7. Pompe centrifuge selon la revendication 5 ou 6, caractérisée en ce que le rotor de pompe est entraîné par un moteur (6) qui présente un déport (L) du rotor (5) par rapport au stator (18), le déplacement axial agissant à l'encontre du déport (L) .
  8. Pompe centrifuge selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'au moteur (6) est associé un système de commande, lequel laisse tourner par intervalles le rotor de pompe (2) avec l'organe de coupe (9) dans la direction de rotation opposée.
  9. Pompe centrifuge selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le corps (1) est conçu sous la forme d'un corps à espace annulaire symétrique à l'axe de la tubulure de pression (20).
  10. Pompe centrifuge selon l'une quelconque des revendications 1 à 9, caractérisée en ce que la turbine (3) comporte un aubage purement radial (19) .
EP12168833.7A 2011-06-15 2012-05-22 Pompe pour barre de coupe Active EP2535589B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011077544A DE102011077544A1 (de) 2011-06-15 2011-06-15 Schneidwerkspumpe

Publications (3)

Publication Number Publication Date
EP2535589A2 EP2535589A2 (fr) 2012-12-19
EP2535589A3 EP2535589A3 (fr) 2018-03-21
EP2535589B1 true EP2535589B1 (fr) 2019-09-11

Family

ID=46168176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12168833.7A Active EP2535589B1 (fr) 2011-06-15 2012-05-22 Pompe pour barre de coupe

Country Status (5)

Country Link
EP (1) EP2535589B1 (fr)
CN (1) CN102913473B (fr)
DE (1) DE102011077544A1 (fr)
DK (1) DK2535589T3 (fr)
HU (1) HUE046949T2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9475059B2 (en) 2013-03-15 2016-10-25 Pentair Flow Technologies, Llc Cutting blade assembly
SE539558C2 (sv) * 2013-08-15 2017-10-10 Xylem Ip Man S À R L Pump för pumpning av vätska samt pumphjulssammansättning
WO2017189741A1 (fr) 2016-04-26 2017-11-02 Pentair Flow Technologies, Llc Ensemble de coupe pour une pompe hacheuse
CN106907327B (zh) * 2017-04-26 2019-06-25 佛山市肯富来工业泵有限公司 泵站的排污泵防堵塞系统及控制部件控制切割部件的方法
US11161121B2 (en) 2019-05-10 2021-11-02 Jung Pumpen Gmbh Cutting blade assembly
CH717149B1 (de) * 2020-02-19 2023-05-15 Mai Joel Schneidepumpe.

Citations (1)

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Publication number Priority date Publication date Assignee Title
US4569638A (en) * 1982-11-30 1986-02-11 International Telephone And Telegraph Corporation Pump with resiliently mounted impeller

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US3786996A (en) 1972-03-20 1974-01-22 Tec Group Axial flow unit
US3961758A (en) 1974-08-23 1976-06-08 Peabody Barnes, Inc. Centrifugal pump with integral grinder
DE2612910A1 (de) * 1976-03-26 1977-09-29 Albert Blum Abwasserpumpe
DE2918228A1 (de) * 1979-05-05 1980-11-13 Dieter Reusch Vorrichtung zum zerkleinern von faserhaltigen beimengungen und feststoffen in pumpfaehigen medien, insbesondere strohhaltigem stallmist und pflanzlichen abfaellen
US5044566A (en) * 1989-12-27 1991-09-03 General Signal Corporation Sewage pump with self-adjusting cutters
DE19643729A1 (de) 1996-10-23 1998-04-30 Sebastian Zunhammer Pumpe
DE29910596U1 (de) * 1999-06-17 1999-09-09 Hugo Vogelsang Maschinenbau GmbH, 49632 Essen Vorrichtung zum Zerkleinern von Feststoffen in inhomogenen Flüssigkeiten
DE20115516U1 (de) * 2001-09-20 2001-11-29 Grundfos A/S, Bjerringbro Kreiselpumpe
CN1839265A (zh) * 2003-07-22 2006-09-27 环境技术泵设备公司 用于轴向调整切碎机泵间隙的装置
US7159806B1 (en) * 2005-01-18 2007-01-09 Ritsema Stephen T Cutter assembly for a grinder pump
US7237736B1 (en) * 2005-12-05 2007-07-03 Little Giant Pump Company Grinder pump with self aligning cutter assembly
DE202006014804U1 (de) * 2006-05-09 2007-09-13 Hugo Vogelsang Maschinenbau Gmbh Vorspannvorrichtung für Messerrotor einer Schneidvorrichtung
DE202009003995U1 (de) 2009-03-25 2010-08-19 Hugo Vogelsang Maschinenbau Gmbh Schneidvorrichtung
CN201714707U (zh) * 2010-06-03 2011-01-19 上海爱澜达水处理科技有限公司 水泵和用于水泵的切割装置

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Publication number Priority date Publication date Assignee Title
US4569638A (en) * 1982-11-30 1986-02-11 International Telephone And Telegraph Corporation Pump with resiliently mounted impeller

Also Published As

Publication number Publication date
CN102913473B (zh) 2016-02-10
HUE046949T2 (hu) 2020-03-30
DK2535589T3 (da) 2019-12-16
EP2535589A2 (fr) 2012-12-19
DE102011077544A1 (de) 2012-12-20
EP2535589A3 (fr) 2018-03-21
CN102913473A (zh) 2013-02-06

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