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WO2008012060A1 - Pompe à engrenages pour le transport de produits avec une part élevée de matériaux solides - Google Patents

Pompe à engrenages pour le transport de produits avec une part élevée de matériaux solides Download PDF

Info

Publication number
WO2008012060A1
WO2008012060A1 PCT/EP2007/006556 EP2007006556W WO2008012060A1 WO 2008012060 A1 WO2008012060 A1 WO 2008012060A1 EP 2007006556 W EP2007006556 W EP 2007006556W WO 2008012060 A1 WO2008012060 A1 WO 2008012060A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
sealing ring
gear pump
gears
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.)
Ceased
Application number
PCT/EP2007/006556
Other languages
German (de)
English (en)
Inventor
Sven Wieczorek
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.)
Witte Pumps & Technology GmbH
Original Assignee
Witte Pumps & Technology 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 Witte Pumps & Technology GmbH filed Critical Witte Pumps & Technology GmbH
Publication of WO2008012060A1 publication Critical patent/WO2008012060A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
    • 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
    • F04C2240/50—Bearings
    • F04C2240/52—Bearings for assemblies with supports on both sides

Definitions

  • the invention relates to a gear pump for conveying products with high solids content such as granules or pet food, in which two intermeshing gears are enclosed in a housing and mounted with their bearing pins in each case a laterally adjacent to the housing housing cover, and with an inlet and an outlet for the good to be promoted.
  • Gear pumps are frequently used to convey highly viscous media in which the viscosity range is, for example, from 1 mPas to 100,000 mPas. With such pumps can be light to heavy fuel oils, lubricating oils, hydraulic oils and synthetic oils promote. If gear pumps are to be used to transport animal or vegetable fat and oils, sugar solutions, high-viscosity polymers, viscose or acetate-cellulose, the viscosities can even reach 25,000,000 mPas. The higher the viscosity, the smaller the speed of the pump must be.
  • the pressures amount to 100 to 1,000 bar and the gears are either straight-toothed, helical or arrow-toothed and generally made in one piece with the drive shaft or the driven shaft.
  • the journals of both the drive shaft and the driven shaft are seated in plain bearings, which are typically product lubricated, which means that the journals run dry prior to conveying a product, so are not lubricated.
  • plain bearings typically product lubricated, which means that the journals run dry prior to conveying a product, so are not lubricated.
  • gear pumps are not suitable for conveying solids since solids can not form a lubricating film which carries the bearing journals.
  • gear pumps have other advantages for the promotion of products with high solids content, which can not be realized with other pumps, such as piston pumps. These include on the one hand the constant flow rate, on the other hand high pressures, which can be reached with a gear pump.
  • the gear pump of the type mentioned is characterized in that the bearing pins of the gears are mounted in rollers, and that for sealing the housing relative to the housing covers with the rolling bearings on each journal a sealing ring sits with one side to a Flank of the gears rests and is pressed with the opposite other side of a spring element sealing against the flank of the gears.
  • a gear pump modified in the manner according to the invention requires reliable sealing of the roller bearings in relation to the product conveying space, since granular solids must not enter the roller bearings so as not to destroy them.
  • the sealing ring according to the invention which serves with a widened or divergent Side surface bears against a respective end face of the gears and is pressed by spring elements in the axial direction against the mentioned end faces.
  • Figure 1 is a section through a gear pump
  • FIG 2 is a perspective view of a sealing ring according to the invention, which is used in the gear pump of Figure 1 is used;
  • Figure 3 is a spring element in perspective, assembled representation, with which the sealing ring of Figure 2 is pressed against the toothed wheel flank;
  • FIG. 4 is an exploded view of the spring element of FIG. 3.
  • Figure 1 shows a vertical section through a gear pump with two meshing gears 2, 2 ', which are housed in a housing 1. Not recognizable are the inlet and the outlet of the gear pump, since they lie in the median plane in front of or behind the cutting plane.
  • the gear pump is symmetrical, so that it is sufficient to describe only the upper part.
  • the gear pump of course also has a drive shaft, a driven shaft or two drive shafts, which is not shown for reasons of clarity.
  • the upper gear 2 is integrally connected to bearing journals 9, which are mounted in bearings 4, 4 1 .
  • Each housing cover 3 thus contributes two rolling bearings 4, 4 ', which are spaced from each other by a partition 10. Between the rolling bearings 4, 4 'and the flanks of the gears 2, 2 1 sealing rings 5, 5' are arranged, which contact the flanks of the gears 2, 2 'and thus the rolling bearings 4, 4' with respect to the housing 1 seal.
  • Each sealing ring 5 has a diameter-expanding outer end, with which it contacts the flanks of the gears 2, 2 'in a region which has been processed in a special way in order to maintain the sealing effect even after a long service life.
  • One type of special processing is to apply a weld by build-up welding and then abrade to improve the hardness of the surface. This process is called "stelliting".
  • the opposite inner end of the sealing ring 5 contacts a spring element 7, which is supported on the roller bearing 4 and thus the sealing ring 5 presses against the flanks of the gears 2, 2 1 .
  • an O-ring 6 is inserted in each case a groove of the housing cover 3 and thus seals the outer periphery 51 of the sealing ring 5 from.
  • Figure 2 shows the sealing ring 5 in a perspective view, which recognizes the widening outer end on the left side, while three recesses 50 are provided for the engagement of pins 40 on the right inner side, which prevent rotation of the sealing ring 5 during operation.
  • the O-ring 6 is seated on an outer circumference 51 of the sealing ring 5, while the inner surface 52 of the sealing ring 5 is arranged at a distance from the bearing journal 9, 9 'during operation.
  • FIG. 3 the spring element 7 is shown in perspective in the assembled state, while in FIG. drawn representation is reproduced.
  • a cage 10 which has the shape of a horizontal U in cross-section, with one side, which is the operation of the rolling bearing 4, 4 1 is closed, is closed.
  • radial bores 41 Through the upper and lower legs of the cage 10 extend radial bores 41, which serve to receive the pins 40.
  • a spring washer 20 and a power transmission ring 30 are inserted, whereby the spring element 7, the sealing ring 5 in the axial direction of the bearing pin 9, 9 'can press against the flanks of the gears 2, 2'.
  • the spring washer 20 is located between the power transmission ring 30 and the closed end of the cage 10.
  • roller bearings 4, 4 ' which are fixed in the usual way in the housing covers 3, for example by the inner rings of the rolling bearings 4, 4' are secured to the bearing pin 9 by Seeger rings against axial displacement, the Spring element 7 against an axial displacement firmly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

L'invention concerne une pompe à engrenages pour le transport de produits avec une part élevée de matériaux solides, tels que des granulats ou des aliments pour animaux, dans laquelle deux roues dentées (2) en contact l'une avec l'autre sont intégrées dans un boîtier (1) et placées avec leurs tourillons (9) dans respectivement un couvercle de boîtier (3) raccordé latéralement au boîtier (1). La pompe à engrenages présente d'autre part une admission et un échappement pour la marchandise à transporter. Elle se distingue en ce que les tourillons (9) des roues dentées (2) sont placés dans des roulements (4) et qu'une bague d'étanchéité (5) se trouve sur chaque tourillon (9) pour étancher le boîtier (1) au niveau des couvercles de boîtier (3) avec les roulements (4). La bague (5) vient buter par un côté contre un flanc des roues dentées (2) et est poussée par l'autre côté opposé contre les flancs des roues dentées (2) en étant étanchée par un élément de suspension (7).
PCT/EP2007/006556 2006-07-24 2007-07-24 Pompe à engrenages pour le transport de produits avec une part élevée de matériaux solides Ceased WO2008012060A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610034141 DE102006034141A1 (de) 2006-07-24 2006-07-24 Zahnradpumpe zur Förderung von Produkten mit hohem Feststoffanteil
DE102006034141.4 2006-07-24

Publications (1)

Publication Number Publication Date
WO2008012060A1 true WO2008012060A1 (fr) 2008-01-31

Family

ID=38521598

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/006556 Ceased WO2008012060A1 (fr) 2006-07-24 2007-07-24 Pompe à engrenages pour le transport de produits avec une part élevée de matériaux solides

Country Status (2)

Country Link
DE (1) DE102006034141A1 (fr)
WO (1) WO2008012060A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023105504A1 (de) * 2023-03-07 2024-09-12 Eberspächer Climate Control Systems GmbH Zahnradpumpe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392798A (en) * 1981-04-03 1983-07-12 General Signal Corporation Gear pump or motor with low pressure bearing lubrication
US4439120A (en) * 1980-10-27 1984-03-27 Skega Ab Meshing cog-wheel injection unit with lateral sealing and scropers
JP2000320471A (ja) * 1999-05-14 2000-11-21 Hitachi Ltd ギヤ式燃料ポンプ
US6183231B1 (en) * 1997-01-31 2001-02-06 United Dominion Industries, Inc. Clean-in-place gear pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439120A (en) * 1980-10-27 1984-03-27 Skega Ab Meshing cog-wheel injection unit with lateral sealing and scropers
US4392798A (en) * 1981-04-03 1983-07-12 General Signal Corporation Gear pump or motor with low pressure bearing lubrication
US6183231B1 (en) * 1997-01-31 2001-02-06 United Dominion Industries, Inc. Clean-in-place gear pump
JP2000320471A (ja) * 1999-05-14 2000-11-21 Hitachi Ltd ギヤ式燃料ポンプ

Also Published As

Publication number Publication date
DE102006034141A1 (de) 2008-01-31

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