EP0799998A1 - Pompe à piston rotatif avec des moyens de retenue magnétiques - Google Patents

Pompe à piston rotatif avec des moyens de retenue magnétiques Download PDF

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Publication number
EP0799998A1
EP0799998A1 EP97104154A EP97104154A EP0799998A1 EP 0799998 A1 EP0799998 A1 EP 0799998A1 EP 97104154 A EP97104154 A EP 97104154A EP 97104154 A EP97104154 A EP 97104154A EP 0799998 A1 EP0799998 A1 EP 0799998A1
Authority
EP
European Patent Office
Prior art keywords
magnets
rotor
magnet
pump
drive shaft
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
EP97104154A
Other languages
German (de)
English (en)
Other versions
EP0799998B1 (fr
Inventor
I.A. Hill
T.F. Fuggle
K.J.. Smith
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.)
Crane Process Flow Technologies GmbH
Original Assignee
Alfa Laval Flow GmbH
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 Alfa Laval Flow GmbH filed Critical Alfa Laval Flow GmbH
Publication of EP0799998A1 publication Critical patent/EP0799998A1/fr
Application granted granted Critical
Publication of EP0799998B1 publication Critical patent/EP0799998B1/fr
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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/10—Stators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S403/00—Joints and connections
    • Y10S403/01—Magnetic

Definitions

  • the invention relates to a pump, in particular a rotary lobe pump with at least one rotor rotating in a pump chamber, which rotor can be pushed onto an end of a drive shaft which projects into the pump chamber.
  • Drench piston pumps are characterized by the fact that they convey the material to be conveyed particularly gently. In addition, its pump chamber is easily accessible and can be effectively cleaned after the rotors have been removed. For these reasons, rotary lobe pumps meet high hygienic requirements and are preferably used in the production of food, in pharmaceutical process engineering or in biotechnology.
  • the rotors can be removed from the ends of the drive shafts projecting into the pump chamber after removal of a front housing wall. To ensure exact positioning of the rotors in the direction of rotation, the ends of the drive shafts have sprockets.
  • the rotors are secured against axial displacement on the drive shaft outside the pump chamber. For this purpose, a sleeve attached to the rotor is guided through the sealing hub until the bead-shaped edge of the sleeve abuts a corresponding ring which surrounds the drive shaft outside the pump chamber. Of the bulbous edge and the ring are held against each other with a releasable clamp.
  • a disadvantage of the known holder is that the loosening and, above all, the mounting of the clip is very complex. So a tool is necessary to loosen the screws and to remove the clamp, which has two half shells encompassing the shaft and the sleeve. In order to enable the clips to be handled well enough, there must be sufficient free space around the clips. The distance between the pump chamber and the coupling housing must be so large that a person's hand fits between them. The cumbersome handling of the clamp makes the maintenance and cleaning work on the pump relatively complex.
  • the object of the invention is to provide a pump, in particular a rotary lobe pump, the at least one rotor of which can be easily removed from the drive shaft and whose pump chamber can be cleaned easily and thoroughly.
  • An essential advantage of the pump according to the invention and the rotors fastened to the drive shaft with the aid of the magnetic force generated by magnets is that after removing the front housing wall, the rotors can be pulled off the ends of the drive shaft protruding into the pump chamber that forms the rotor housing, without the need for additional tools.
  • the rotor can be pulled from the drive shaft by turning the front housing wall with the magnet located therein so that the magnet attracts the rotor.
  • the assembly of a rotor a drive shaft is so comfortable that it can also be carried out mechanically.
  • the holder according to the invention by the magnets also contributes to the fact that the pump can be built in a particularly compact manner, since no separate space is required for handling the connection between the rotor and the drive shaft.
  • the magnetic forces can be generated by permanent magnets or by electromagnets.
  • the use of permanent magnets has the advantage that large magnetic forces are available even without an additional electrical supply.
  • the permanent magnets can be installed anywhere in the rotors or the housing parts.
  • Electromagnets on the other hand, have the advantage that the magnetic force can be switched on and off as required. Removing the rotors when the magnets are switched off is particularly easy.
  • the magnetic holder has the advantage that it can be used with all types of pumps that have a rotor attached to a drive shaft.
  • a particularly advantageous axial mounting of the rotors (rotary lobes) on the drive shaft is possible if the rotor or a part connected to the rotor, in particular a sleeve, is pressed against a stop by the magnetic force.
  • the stop is advantageously an edge or a ring that surrounds the drive shaft.
  • the easy handling of the front housing cover and the rotors enables easy maintenance and cleaning of the pump chamber of a rotary lobe pump with just a few steps.
  • the rotary lobe pump according to the invention has the advantage that, apart from the sealing hub, there are no gaps in the pump chamber in which material to be conveyed can settle and become a breeding ground for germs.
  • a magnet in the rotor which exerts an attractive force on the rotating front end of the drive shaft.
  • a magnet in the end of the drive shaft which is opposite the magnet in the rotor with the corresponding opposite pole.
  • a magnet is arranged in a ring around the end of the sleeve formed on the rotor. This magnet acts with an attractive force on an annular projection or a magnet arranged around the shaft.
  • magnets are built into the surfaces of the rotor facing the rear housing wall of the pump chamber.
  • magnets are also advantageous to install magnets in the rear housing wall, which are in particular assembled into a ring. This creates an even, attractive force.
  • FIGS 1 to 5 each show a pump chamber 1 of a rotary lobe pump.
  • the pump chamber 1 has a housing 2, which is closed by a front housing wall 3.
  • the front housing wall 3 is fastened to the housing 2 with screws 4 and sealed with a seal 5.
  • the housing 2 has a rear housing wall 6 parallel to the front housing wall 3.
  • In the rear housing wall 6 there is a bore designed as a sealing hub 7, through which a drive shaft 8 is inserted into the pump chamber 1.
  • a rotor in the form of a rotary piston 10 can be pushed onto the end 9 of the drive shaft 8 which projects into the pump chamber 1.
  • the teeth located in the bore 11 of the rotary piston 10 fit into a tooth profile 12 which is located on the end 9.
  • the bore 11 is not continuous.
  • An axial extension in the form of a sleeve 13 is formed on the rotary piston 10, which surrounds the drive shaft 8 and which passes through the sealed hub 7.
  • the sleeve 13 With a screwed-in edge 13a, the sleeve 13 abuts a stop 14 which surrounds the drive shaft 8 in a ring.
  • the stop 14 limits the axial displacement of the rotary piston 10 in the direction of the rear housing wall 6.
  • a groove is screwed into the inner wall of the sleeve 13, in which a sealing ring (O-ring) 20a lies. This O-ring 20a seals the sleeve 13 against the drive shaft 8, so that no impurities can reach the radially oriented surface forming the stop 14.
  • the sleeve 13 protruding from the pump chamber 1 and sealed against the housing 2 has the effect that no gaps occur in the pump chamber 1 between the drive shaft 8 and the rotary piston 10, into which material to be conveyed could get. Since the rotary piston 10 has a closed surface on its front side, the drive shaft is completely sealed off from the pumped medium.
  • the axial displacement of the rotary piston in the direction of the front housing wall 3 is brought about by magnetic forces which are caused by two magnets 15 and 16.
  • the magnet 15 is installed in the front housing wall 3, while the magnet 16 is installed in the rotary piston 10 behind a thin wall 17.
  • the magnets 15 and 16 are poled so that they repel each other.
  • the magnet 15 is inserted in a blind hole 18 in the front housing wall 3, which is closed with a cover 19.
  • the repulsive force of the magnets presses the rotary piston 10 with the attached sleeve 13 against the stop 14, so that displacement of the rotary piston on the drive shaft 8 is impossible.
  • the axial force of the magnets is sufficient to close a mechanical seal.
  • a magnet 21 is installed in the rotary piston 10 such that it exerts an attractive force on the end 9 of the drive shaft 8 made of ferritic material, in particular iron.
  • the distance between the end 9 of the magnet 21 is very small and is designed so that the attractive force when removing the rotary piston 10 can be overcome easily.
  • FIG. 3 shows a pump chamber 1 which has a rotary piston 10 which is attracted by magnets 22 which are built into the rear housing wall 6. To increase the attractive force are also in the wings of the Rotary piston 10 magnets 23 installed, which are polarized accordingly in the same direction.
  • the magnets 22 and 23 are arranged concentrically around the drive shaft 8.
  • Figure 4 corresponds to that of Figure 2 except for the fact that to support the attractive forces of the magnet 21 on the end 9 of the drive shaft 10, an additional magnet 24 installed in the end 9. Both magnets 21 and 24 have the same polarity, so that an attractive force arises.
  • the repelling effect of the magnets 15 and 16 (compare FIG. 1) is combined with the attractive effect of the magnets 22 and 23 (compare FIG. 3).
  • the combination of several magnets enables the force of the individual magnets to be made smaller in order to counteract the generation of eddy currents and to homogenize the heating of the rotary lobe and the pump chamber.
  • the centrally arranged and the ring-shaped magnets are shaped so that there is no imbalance when the pump is running.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
EP97104154A 1996-04-03 1997-03-12 Pompe à piston rotatif avec des moyens de retenue magnétiques Expired - Lifetime EP0799998B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19613148A DE19613148A1 (de) 1996-04-03 1996-04-03 Drehkolbenpumpe mit magnetischer Rotorhalterung
DE19613148 1996-04-03

Publications (2)

Publication Number Publication Date
EP0799998A1 true EP0799998A1 (fr) 1997-10-08
EP0799998B1 EP0799998B1 (fr) 1999-04-14

Family

ID=7790252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97104154A Expired - Lifetime EP0799998B1 (fr) 1996-04-03 1997-03-12 Pompe à piston rotatif avec des moyens de retenue magnétiques

Country Status (4)

Country Link
US (1) US5957677A (fr)
EP (1) EP0799998B1 (fr)
AT (1) ATE178976T1 (fr)
DE (2) DE19613148A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945621A1 (fr) * 1998-03-24 1999-09-29 Siemens Aktiengesellschaft Compresseur à anneau liquide
WO2013120483A1 (fr) * 2012-02-17 2013-08-22 Netzsch Mohnopumpen Gmbh Pompe à pistons rotatifs
US9500208B2 (en) * 2014-04-25 2016-11-22 Apple Inc. Magnetic preloading of joints
CN111946613A (zh) * 2020-08-25 2020-11-17 扬州大学 一种基于层流边界层和旋转磁场的微型圆盘泵设计方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2205980C2 (ru) * 1999-08-27 2003-06-10 Джеймс Б. ТАЙБЕН Насос (варианты)
US6244842B1 (en) * 1999-11-09 2001-06-12 James B. Tieben Pump
MXPA01004187A (es) * 1999-08-27 2003-06-06 B Tieben James Bomba.
DE10024020A1 (de) * 2000-05-16 2001-11-22 Schlafhorst & Co W Offenend-Spinnrotor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157049A2 (fr) * 1983-12-20 1985-10-09 Ssp Pumps Limited Pompes à cames rotatives
US5249940A (en) * 1991-04-26 1993-10-05 Nippon Soken, Inc. Scroll compressor having a magnet pressing the moving scroll member axially

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1060482B (de) * 1958-06-28 1959-07-02 Gossen & Co Gmbh P Einstellbare Innenlagerung fuer Kernmagnetmesswerke
US3080170A (en) * 1959-01-02 1963-03-05 Magnetic Seal Corp Seal providing for substantial axial movement
DE2056661C3 (de) * 1970-11-18 1975-03-27 Eisenwerke Kaiserslautern Gmbh, 6750 Kaiserslautern Verdrängerflügel für eine Drehkolbenpumpe zum Fördern zähflüssiger, gegebenenfalls inhomogener, korrosiver Medien
DE2206237A1 (de) * 1972-02-10 1973-08-23 Skf Kugellagerfabriken Gmbh Lagerung fuer schnellaufende wellen oder achsen
DE2337226A1 (de) * 1973-07-21 1975-02-06 Maschf Augsburg Nuernberg Ag Vakuumpumpe mit einem im innenraum ihres gehaeuses gelagerten laeufer
DE8815196U1 (de) * 1988-12-07 1989-02-16 Lewitz, Reinwald, 3100 Celle Schwebe-Dreh-Flasche
NL9000785A (nl) * 1990-04-03 1991-11-01 Boer B V De Verdringerpomp.
NL9001875A (nl) * 1990-07-17 1992-02-17 Bombas Stork S A Lobbenrotorpomp.
DE4024067A1 (de) * 1990-07-28 1992-01-30 Friedhelm Schneider Zahnradpumpe fuer hochviskose fluessigkeiten
US5129795A (en) * 1991-05-31 1992-07-14 Powerdyne Corporation Motor driven pump
US5350283A (en) * 1991-12-04 1994-09-27 Ntn Corporation Clean pump
DE4224736A1 (de) * 1992-07-27 1994-02-03 Luk Fahrzeug Hydraulik Hydraulikmaschine
US5391068A (en) * 1994-02-15 1995-02-21 Eaton Corporation Gear pump
DE4410656A1 (de) * 1994-03-26 1995-09-28 Balzers Pfeiffer Gmbh Reibungspumpe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157049A2 (fr) * 1983-12-20 1985-10-09 Ssp Pumps Limited Pompes à cames rotatives
US5249940A (en) * 1991-04-26 1993-10-05 Nippon Soken, Inc. Scroll compressor having a magnet pressing the moving scroll member axially

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945621A1 (fr) * 1998-03-24 1999-09-29 Siemens Aktiengesellschaft Compresseur à anneau liquide
WO2013120483A1 (fr) * 2012-02-17 2013-08-22 Netzsch Mohnopumpen Gmbh Pompe à pistons rotatifs
US9617995B2 (en) 2012-02-17 2017-04-11 Netzsch Pumpen & Systeme Gmbh Rotary piston pump with slip ring seals for improved fitting and synchronization of rotary pistons
US9500208B2 (en) * 2014-04-25 2016-11-22 Apple Inc. Magnetic preloading of joints
CN111946613A (zh) * 2020-08-25 2020-11-17 扬州大学 一种基于层流边界层和旋转磁场的微型圆盘泵设计方法

Also Published As

Publication number Publication date
DE19613148A1 (de) 1997-10-09
ATE178976T1 (de) 1999-04-15
DE59700129D1 (de) 1999-05-20
US5957677A (en) 1999-09-28
EP0799998B1 (fr) 1999-04-14

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