EP0147567A2 - Pompe à engrenages spécialement pour butes médicales - Google Patents

Pompe à engrenages spécialement pour butes médicales Download PDF

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Publication number
EP0147567A2
EP0147567A2 EP84113140A EP84113140A EP0147567A2 EP 0147567 A2 EP0147567 A2 EP 0147567A2 EP 84113140 A EP84113140 A EP 84113140A EP 84113140 A EP84113140 A EP 84113140A EP 0147567 A2 EP0147567 A2 EP 0147567A2
Authority
EP
European Patent Office
Prior art keywords
pump
shaft
gear pump
hub
wheel
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
EP84113140A
Other languages
German (de)
English (en)
Other versions
EP0147567B1 (fr
EP0147567A3 (en
Inventor
Wolfgang Zenglein
Franz-Josef Weinbeer
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.)
Fresenius SE and Co KGaA
Original Assignee
Fresenius 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 Fresenius SE and Co KGaA filed Critical Fresenius SE and Co KGaA
Publication of EP0147567A2 publication Critical patent/EP0147567A2/fr
Publication of EP0147567A3 publication Critical patent/EP0147567A3/de
Application granted granted Critical
Publication of EP0147567B1 publication Critical patent/EP0147567B1/fr
Expired 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • 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
    • F04C15/0057—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
    • F04C15/0069—Magnetic couplings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Definitions

  • the invention relates to a gear pump, in particular for medical purposes, according to the preamble of claim 1.
  • Gear pumps are used in medicine, for example in the field of dialysis.
  • a generic gear pump which is also used in this area of medicine, among other things, has a pump housing which has a base plate, a cover plate and a middle housing part arranged between them.
  • At least two pump wheels are arranged in the pump chamber of the middle part of the housing, which in the generic gear pump consist of a special steel such as Waukesha 88.
  • the pump wheels are mounted on rotating shafts, a magnet being attached to the shaft of the driving pump wheel, which is in engagement with the driven pump wheel, which forms part of a magnetic coupling for transmitting the driving forces to the shaft of the driving pump wheel.
  • Both the shafts of the pump wheels and their bearing bushes for storage in the pump housing are made of a high-strength metal, such as Widia steel, in the generic gear pump, so that the parts are guided at high speed running pump wheels and their shafts is ensured.
  • the generic gear pump has the serious disadvantage that despite the use of expensive materials that are considered wear-resistant, despite a considerable number of gear pumps, which are used in particular in the medical field, after a relatively short period of use, there are considerable signs of wear, particularly in the area of the shafts Pump wheels and their bearings occur in the pump housing. As tests carried out within the scope of the invention have shown, these wear phenomena are due to material decomposition of the bearings and the shafts due to the use of aggressive cleaning media such as, for example, acetic acid.
  • the provision of fixed axles for the pump wheels initially ensures that no bearings are required for rotating shafts in the gear pump according to the invention, which bearings are very sensitive to wear, particularly when using aggressive cleaning agents.
  • the gear pump according to the invention thus has the advantage that it has high stability even when used in areas in which cleaning of the gear pump by means of aggressive media is unavoidable, since bearing wear cannot occur.
  • gear pump according to the invention Another advantage of the gear pump according to the invention is that no or no significant wear occurs in the area between the pump wheels and fixed axles due to the use of suitable plastics, so that there is no shift in the wear problem from the mounting of the rotating shafts to the mounting the pump wheels rotating on the fixed axles. Further investigations carried out within the scope of the invention have shown that the use of pump wheels made of plastic is also entirely possible for the above-mentioned critical fields of application, in particular in the field of medicine.
  • the provision of the hollow shaft which is connected on the one hand to the driving pump wheel and on the other hand to one of the magnets of the magnetic coupling, ensures that a drive connection between the magnet and the driving pump wheel is possible, although the driving pump wheel is arranged freely rotating on a fixed axis is. Furthermore, there is the advantage that also in the area there is no measurable wear on the hollow shaft, since it also consists of a very resistant plastic with very good running properties.
  • the shaft that connects the driving pump wheel to the magnet is designed as a hollow shaft in the gear pump according to the invention, which rotates on the fixed axis, there are no problems with flexibility in the gear pump according to the invention, since the hollow shaft extends over its entire length on the fixed axis Axle can support and also has a much larger effective diameter than in the previously described basically conceivable possibility of a rotating shaft with a diameter that would correspond approximately to the diameter of the axes of the gear pump according to the invention. A correspondingly larger dimensioning of such conceivable plastic shafts is unsuitable for reasons of the increased space requirement and the growing overall size of the gear pump.
  • pump wheels and the hollow shaft are formed from polytetrafluoroethylene graphite according to the advantageous further development according to claim 2, particularly favorable running properties result on the fixed axle journal and furthermore this material has proven to be particularly resistant to all media used in the field of dialysis.
  • the driving pump unit and the hollow shaft can be formed in one piece, which has advantages in terms of production.
  • these two components of the gear pump according to the invention can also be connected to one another in other ways, should this be necessary for any design reasons.
  • the pump wheel and the hollow shaft could be connected to one another by means of a pin connection.
  • journal of the driven pump wheel is guided only in the cover plate of the pump housing, there is the advantage that a further guide recess in the base plate of the pump housing can be omitted, which reduces the manufacturing outlay.
  • Such one-sided guidance of the axle journal is possible in the gear pump according to the invention because the axle journal is not excessively long and, in addition, on the side of the driven pump wheel, no forces are transmitted to the axle journal that great guidance would be required on both sides.
  • the magnet of the magnetic coupling is arranged on a hub which can be fastened to the hollow shaft, there is the advantage that the fastening of the magnet can be provided on a part which is independent of the hollow shaft, so that the formation of the hollow shaft itself above all from the point of view optimal running properties on the fixed axle journal and wear resistance takes into account, whereas the problem of fastening the magnet is limited to the hub, which then only has to be fastened to the hollow shaft.
  • the gear pump 1 shows a gear pump 1 according to the invention, which is particularly suitable for medical purposes such as dialysis.
  • the gear pump 1 has a pump housing 2 which has a base plate 3, a cover plate 4 and a housing middle part 5.
  • the middle housing part 5 is arranged between the base plate 3 and the cover plate 4 and connected to them, for example, by means of screws or similar fastening means.
  • the middle housing section 5 has a pump chamber 6, in which in the example case two pump wheels 7 and 8 are arranged.
  • the pump wheel 7 is the driving pump wheel, while the pump wheel 8 is driven.
  • the pump wheel 8 is in engagement with the pump wheel 7.
  • a hood 9 is further fastened in a manner not shown.
  • a magnet 11 is arranged, which forms part of a magnetic coupling, not shown, for transmitting the driving forces for the gear pump 1.
  • the pump wheels 7 and 8 are each arranged on a fixed axle journal 12 or 13.
  • the axle journals 12 and 13 are fastened in corresponding guide recesses 14 and 15 of the cover plate 4, for which purpose an adhesive was used in the example.
  • V4A steel for example, has proven to be a suitable material for the axle journals 12 and 13, while an adhesive called Loctite 648, for example, is suitable as a connecting means with the cover plate 4.
  • Polytetrafluoroethylene graphite (Teflon graphite) has proven to be a particularly suitable material for the pump wheels 7 and 8, since this material has particularly good running properties, so that wear occurs between the pump wheels 7 and 8 and the associated axle journals 12 and 13, respectively does not occur or occurs to a negligible extent. Furthermore, the material mentioned for the pump wheels 7 and 8 is resistant to all common media, in particular in the medical field such as, for example se must be promoted in the dialysis of gear pumps, or be used for their cleaning.
  • the pump wheels 7 and 8 can be provided with helical teeth, for which purpose the driving pump wheel 7 can be serrated 6 ° to the left, for example, while the driven impeller 8 can be ... helically geared 6 ° to the right.
  • the driving pump wheel 7 is connected to a shaft 16, which according to the invention is designed as a hollow shaft.
  • the shaft 16 is integrally connected to the pump wheel 7 and consists of the same material.
  • the one-piece design of the pump wheel 7 and the shaft 16 results in a compact and stable structural unit which is also suitable for the transmission of high torques.
  • the one-piece construction of pump wheel 7 and shaft 16 illustrated in the example case can, however, also be replaced by another connection between the named components if necessary, for which purpose a pin connection is suitable, for example.
  • the pump wheel 7 and the shaft 16 designed as a hollow shaft each have a passage recess 17 or 18, which in the case of the one-piece construction form a single continuous passage recess.
  • the shaft 16 On the side facing away from the impeller 7, the shaft 16 has a locking recess 19 which has an area 20 extending in the axial direction of the shaft and an area 21 extending in the radial direction of the shaft 16.
  • the magnet 11 is arranged on a hub 24, which in the example has a cylindrical sleeve 25 with an inner recess 26 and an annular flange 27 arranged at one end of the sleeve 25.
  • the annular flange 27 has a:.
  • Inner recess 28 with a diameter which corresponds to that of the inner recess of the sleeve 25.
  • the sleeve 25 is further provided with two radially opposite recesses 29 and 30, in which locking pins 31 and 32 are fastened, for example by means of an adhesive.
  • the magnet 11 itself is arranged on the outer circumference of the sleeve 25 and can also be attached to the sleeve 25 by means of an adhesive.
  • the pump wheel 7 and the shaft 16 connected to it are arranged on the journal 12, the shaft 16 being supported over its entire length on the journal 12, so that despite the plastic material for the Wave 16 no deflections are to be feared.
  • these have passage recesses 34 and 35, respectively.
  • the hub 24 with the magnet 11 attached to it is arranged in the example case on the area of the shaft 16 protruding into the space 10 of the hood 9, the locking pins 31 and 32 in the corresponding rig recesses 19 and 22 respectively intervention.
  • the locking recesses 19 and 23 and the locking pins 31 and 32 form a bayonet lock, which builds up its locking action after rotation of the hub 24, the locking pins 31 and 32 initially in the axial regions 20 and 36 of the locking recesses 19 and 22 will be introduced.
  • the locking pins 31 and 32 are inserted into the radial areas 21 and 23 of the locking recesses 19 and 22, after which the locking pins 31 and 32 engage behind the corresponding adjacent wall areas of the shaft 16, so that the hub 24 slides off the hollow shaft 16 is prevented.
  • the assembly steps described above show that the gear pump l according to the invention can be assembled in an extremely inexpensive and rapid manner and that, owing to the provision of two fixed axle journals 12 and 13, a number of complex manufacturing and assembly steps are omitted, as are the case with gear pumps with rotating shafts. would be required for the pump wheels 7 and 8.
  • the gear pump 1 according to the invention the drive connection between the magnet 11 and the driving pump wheel 7 is nevertheless ensured in an extremely simple manner by means of the shaft 16 designed as a hollow shaft, with a sufficiently high stability being achieved despite its plastic construction, since the shaft 16 is over their entire length is supported on the journal 12.
  • the wear is not increased as the shaft 16, like the pump wheels 7 and 8, is made of a wear-resistant material Plastic with very good running properties can be manufactured, which is also resistant to all common media, especially in the medical field.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP84113140A 1983-11-10 1984-10-31 Pompe à engrenages spécialement pour butes médicales Expired EP0147567B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3340748A DE3340748C2 (de) 1983-11-10 1983-11-10 Zahnradpumpe, insbesondere für medizinische Zwecke
DE3340748 1983-11-10

Publications (3)

Publication Number Publication Date
EP0147567A2 true EP0147567A2 (fr) 1985-07-10
EP0147567A3 EP0147567A3 (en) 1986-01-08
EP0147567B1 EP0147567B1 (fr) 1988-08-31

Family

ID=6214018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113140A Expired EP0147567B1 (fr) 1983-11-10 1984-10-31 Pompe à engrenages spécialement pour butes médicales

Country Status (3)

Country Link
US (1) US4583924A (fr)
EP (1) EP0147567B1 (fr)
DE (2) DE3340748C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484201A1 (fr) * 1990-10-22 1992-05-06 Michel Bavouzet Pompe et (ou) moteur hydraulique à engrenage fonctionnant à l'eau
DE19915784C2 (de) * 1999-04-08 2001-03-01 Fresenius Medical Care De Gmbh Zahnradpumpe, insbesondere für medizinische Zwecke
DE102005042040B3 (de) * 2005-09-02 2007-05-16 Fresenius Medical Care De Gmbh Zahnradpumpe

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583003A1 (fr) * 1992-08-13 1994-02-16 Perseptive Biosystems, Inc. Système pour le dosage, le mélange et le contrôle de la composition de fluides
DE19710804A1 (de) * 1997-03-17 1998-09-24 Geraete Und Pumpenbau Gmbh Zahnradpumpe zum Fördern von Fluiden
DE19725462A1 (de) * 1997-06-16 1998-12-24 Storz Endoskop Gmbh Medizinische Zahnradpumpe zum Saugen und Spülen
US7287398B2 (en) * 2001-09-25 2007-10-30 Alsius Corporation Heating/cooling system for indwelling heat exchange catheter
DE19842016A1 (de) * 1998-09-14 2000-03-16 Backes Claus H Vorrichtung zum Pumpen von Fluiden
FR2794188B1 (fr) * 1999-05-28 2001-08-10 Hydroperfect Internat Pompe hydraulique a engrenage
US6325604B1 (en) * 2000-03-29 2001-12-04 Benjamin R. Du Plastic gear pump housing
US6730123B1 (en) * 2000-06-22 2004-05-04 Proteus Vision, Llc Adjustable intraocular lens
US6551070B2 (en) * 2001-08-22 2003-04-22 Micropump, Inc., A Unit Of Idex Corporation Devices and methods for noise suppression in pumps
DK2282059T3 (en) * 2004-07-30 2017-03-06 Pulsafeeder Inc Gear pump with magnetic clutch assembly
US20060047065A1 (en) * 2004-08-30 2006-03-02 Wiebke Becker Aqueous coating compositions based on acrylate copolymers
TW200719126A (en) * 2005-11-01 2007-05-16 Sunonwealth Electr Mach Ind Co Compact fluid pump
JP2009299471A (ja) * 2008-04-24 2009-12-24 Daito Kogyo Kk マグネットカップリング機構を有するギアポンプ
US8047825B2 (en) * 2007-04-09 2011-11-01 United Technologies Corporation Fluoropolymer-containing films for use with positive-displacement fluid pumps
EP3786416B1 (fr) * 2019-08-29 2021-09-29 Thomas Michael Wollmann Pompe à engrenage à auto-alignement
US12261828B2 (en) * 2022-12-08 2025-03-25 International Business Machines Corporation Modifying security of microservices in a chain based on predicted confidential data flow through the microservices

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE589418C (de) * 1933-12-08 Johannes Lambeck Zahnraederpumpe, insbesondere zur Foerderung von Celluloseloesungen
GB422011A (en) * 1933-03-28 1935-01-03 Barmag Barmer Maschf Toothed wheel pump for artificial silk spinning machines
US2302966A (en) * 1940-01-02 1942-11-24 Bendix Aviat Corp Pump
GB638936A (en) * 1946-11-12 1950-06-21 Sigma Improvements in gearing applicable to gear pumps
US2672823A (en) * 1948-01-12 1954-03-23 Waterous Co Rotary pump
FR1139203A (fr) * 1952-01-15 1957-06-26 Pompe à engrenages
GB828159A (en) * 1955-07-12 1960-02-17 Straumann Inst Ag Improvements in bearings for movable parts which are subject to friction
FR1194511A (fr) * 1958-03-05 1959-11-10 Pompe pour matières pulvérulentes à carter ouvert
US3010733A (en) * 1959-09-24 1961-11-28 Jamco Inc Idler arm bearing and assembly
FR1299342A (fr) * 1961-09-04 1962-07-20 Coy Mfg Company Pompe à engrenage
GB1002766A (en) * 1961-09-05 1965-08-25 Coy Mfg Company Improvements in gear pumps
US3240095A (en) * 1962-03-05 1966-03-15 Steinway & Sons Piano action bushing assembly
US3283358A (en) * 1964-09-16 1966-11-08 Richard S Merriam Heavy duty caster
FR1593463A (fr) * 1967-12-04 1970-05-25
US3716306A (en) * 1971-03-31 1973-02-13 Micropump Corp Gear pump construction
US4065235A (en) * 1976-06-01 1977-12-27 Tuthill Pump Company Gear pump
DE3045192C2 (de) * 1980-12-01 1983-10-27 Fresenius AG, 6380 Bad Homburg Zahnradpumpe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484201A1 (fr) * 1990-10-22 1992-05-06 Michel Bavouzet Pompe et (ou) moteur hydraulique à engrenage fonctionnant à l'eau
DE19915784C2 (de) * 1999-04-08 2001-03-01 Fresenius Medical Care De Gmbh Zahnradpumpe, insbesondere für medizinische Zwecke
DE102005042040B3 (de) * 2005-09-02 2007-05-16 Fresenius Medical Care De Gmbh Zahnradpumpe
US7878783B2 (en) * 2005-09-02 2011-02-01 Fresenius Medical Care Deutschland Gmbh Gear pump with components constructed as a homogenous workpiece

Also Published As

Publication number Publication date
DE3340748A1 (de) 1985-05-30
US4583924A (en) 1986-04-22
EP0147567B1 (fr) 1988-08-31
DE3340748C2 (de) 1986-09-25
EP0147567A3 (en) 1986-01-08
DE3473785D1 (en) 1988-10-06

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