EP0692073A1 - Pompe a engrenages pour le refoulement d'un liquide - Google Patents

Pompe a engrenages pour le refoulement d'un liquide

Info

Publication number
EP0692073A1
EP0692073A1 EP94913058A EP94913058A EP0692073A1 EP 0692073 A1 EP0692073 A1 EP 0692073A1 EP 94913058 A EP94913058 A EP 94913058A EP 94913058 A EP94913058 A EP 94913058A EP 0692073 A1 EP0692073 A1 EP 0692073A1
Authority
EP
European Patent Office
Prior art keywords
wall
gear
gears
housing
gear pump
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.)
Withdrawn
Application number
EP94913058A
Other languages
German (de)
English (en)
Inventor
Ulrich Pfuhler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0692073A1 publication Critical patent/EP0692073A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/185Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-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
    • F04C2/14Rotary-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
    • F04C2/18Rotary-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

Definitions

  • the invention relates to a gear pump for conveying a flowable medium. Reference is made to the preamble of claim 1.
  • Gear pumps of this type are used for both stationary and mobile operation.
  • the known advantages mainly consist in achieving high and very high pressures with a relatively precise volumetric dosage.
  • DE 41 21 074 AI describes an external gear pump with a continuously variable flow rate.
  • two gear wheels which are displaceable relative to one another are provided.
  • the driven gear is mounted in a housing, while the rotating gear is adjusted depending on the fluid pressure difference applied to the pump.
  • the invention has for its object to design a gear pump according to the preamble of claim 1, that their main purpose of easily and quickly changing the flow rate during operation is perfectly fulfilled, but that the seal is less exposed to wear than previously known gear pumps, and that the construction effort is kept within limits.
  • the following can be achieved in this way: Simply by moving two meshing gears in the axial direction relative to one another, and thus by changing the mutual degree of coverage, the delivery rate can be varied.
  • the pump has only rotating parts, no impact parts.
  • the pump can be geometrically reduced or enlarged. Basically, the same or the same components can be used when manufacturing series; to change the maximum flow rate you only need to change the overall length of the main components.
  • Fig. 1 shows a pump equipped with two gears in a longitudinal section.
  • 2 to 5 are cross sections in the planes A-A, B-B, C-C and in the offset planes D-D.
  • Fig. 6 shows in an enlarged, perspective
  • Fig. 7 shows the pump in three different operating states.
  • 8 shows a further embodiment of a gear pump according to the invention with two fixed gear wheels which are coaxial with one another and with a displaceable gear wheel which is axially parallel to the first two.
  • the gear pump shown in Figures 1 to 6 has two gears 1 and 2. These are arranged axially parallel to each other and mesh with each other over part of their length.
  • a housing 3 is provided
  • Figure 6 shows that the movable partition 8 not only serves to limit and seal the work space, but also has a bearing function for gear 2.
  • 6 shows the wall 8 in detail, a radial bearing 8.1 carried by it, a seal 8.2 for sealing the tooth contour against the radial bearing 8.1, a shaft seal 8.3 and a seal 8.4 for sealing the displaceable wall 8 against the peripheral wall 3.2 of the
  • chambers 20, 21, 22 there are three chambers 20, 21, 22 in the housing 3.
  • One of these chambers, namely chamber 21, is located within the bridge 9. It is advantageous that the two chambers 21 and 22 are under pressure.
  • the walls 6 and 8 and thus also the circumferential seals 8.2, 8.3 and 8.4 are also pressurized from the outside, which relieves all seals between the fixed and the moving parts. It is advantageous to establish a conductive connection between the chambers 21 and 22 so that one chamber can feed the other.
  • FIG. 7 The mode of operation of this first embodiment of a gear pump according to the invention is shown in FIG. 7, with individual working positions resulting from FIGS. 7.1, 7.2 and 7.3.
  • the mentioned slide with gear wheel 1 is brought into a middle position, the axial degree of overlap of the two gear wheels 1, 2 taking on an intermediate size. In this state, the volume delivered has an average value.
  • the degree of coverage of the two gear wheels 1, 2 is as large as the construction of the pump allows.
  • the slide, and thus also gear 1, have been shifted to the right as far as possible.
  • the degree of coverage is maximum. Accordingly, the funding volume is also maximum.
  • the carriage is controlled via the above-mentioned connections 10 and 11 by a corresponding pressurized control medium. This allows the carriage to be moved continuously and held in any position. It can be seen from this that a continuous adjustment of the delivery rate is possible during operation.
  • the pump can be adjusted by externally generated or self-generated hydrostatic pressure, in the latter case only during operation.
  • a pressure accumulator could be provided so that adjustment pressure is always available. This only needs to have minimal dimensions and can optionally be accommodated between the outer walls 3.1, 3.2 on the one hand and the bridge 9 on the other.
  • Gear pump shown in Fig. 8, differs from the first in that a total of three gears are provided, namely a lower, axially displaceable gear 1 and two upper, fixed gears 2.1, 2.2, which are arranged coaxially to one another.
  • a housing 3 with U initial walls 3.1, 3.2, end walls 3.3 and 3.4 and essentially all other components of the first embodiment.
  • the advantage of this three-wheel embodiment is that there are two work spaces.
  • the width of these working spaces is indicated by the reference symbols a- and a 2 .
  • the working spaces are delimited by the two outer, displaceable end walls 7, 8 of the slide and by a fixed intermediate wall 6.
  • the bottom of the tooth space is placed somewhat deeper radially inwards at the end of the individual gear on the working space side, the bottom falling off towards the end face of the gear in question. This enables perfect removal of squeeze oil into the low-pressure region 17.
  • the invention can be applied not only to pumps, but also to hydrostatic motors.

Landscapes

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

Abstract

Une pompe ou un moteur à engrenages pour le refoulement d'un liquide a les caractéristiques suivantes: des roues dentées à axes parallèles (1, 2) s'engrènent deux par deux; un boîtier (3) renferme les roues dentées et comprend une paroi enveloppe (3.1, 3.2); une face interne de la paroi forme des fentes de refoulement avec les roues dentées, les fentes de refoulement s'étendant chacune sur une partie de la circonférence des engrenages; une chambre basse pression située dans la zone d'admission de la fente de refoulement comprend une admission et une chambre haute pression située dans la zone de sortie de la fente de refoulement comprend une sortie du milieu à refouler; une des roues dentées est rigidement fixé au boîtier, alors que l'autre est mobile dans la direction axiale. L'invention présente les caractéristiques suivantes: laroue dentée mobile (1) porte sur chacune de ses deux extrémités une paroi faciale (7, 8) qui lui est rigidement assujettie; les deux parois faciales (7, 8) s'appuient de façon étanche sur la surface interne de la paroi enveloppe (3.1, 3.2) du boîtier (3); la surface interne de la paroi est constituée d'une paroi (9) qui relie les deux parois faciales mobiles (7, 8) et qui forme avec celles-ci un chariot mobile dans le boîtier (3); la roue dentée fixe (2) porte à son extrémité libre une paroi frontale (6) qui lui est rigidement assujettie et qui s'appuie de façon étanche sur la surface interne de la paroi (9).
EP94913058A 1993-03-31 1994-03-26 Pompe a engrenages pour le refoulement d'un liquide Withdrawn EP0692073A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4310518 1993-03-31
DE4310518A DE4310518C1 (de) 1993-03-31 1993-03-31 Zahnradpumpe zum Fördern eines fließfähigen Mediums
PCT/EP1994/000961 WO1994023209A1 (fr) 1993-03-31 1994-03-26 Pompe a engrenages pour le refoulement d'un liquide

Publications (1)

Publication Number Publication Date
EP0692073A1 true EP0692073A1 (fr) 1996-01-17

Family

ID=6484364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94913058A Withdrawn EP0692073A1 (fr) 1993-03-31 1994-03-26 Pompe a engrenages pour le refoulement d'un liquide

Country Status (6)

Country Link
US (1) US5620315A (fr)
EP (1) EP0692073A1 (fr)
JP (1) JPH09502234A (fr)
KR (1) KR960702064A (fr)
DE (1) DE4310518C1 (fr)
WO (1) WO1994023209A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19947577A1 (de) * 1999-10-01 2000-11-30 Daimler Chrysler Ag Stufenlos regelbare Fördereinrichtung
US20070227802A1 (en) * 2004-04-09 2007-10-04 O'brien James A Ii Hybrid earthmover
US7281376B2 (en) * 2005-02-22 2007-10-16 Hybra-Drive Systems, Llc Hydraulic hybrid powertrain system
US8215932B2 (en) * 2004-04-09 2012-07-10 Limo-Reid, Inc. Long life telescoping gear pumps and motors
WO2005100780A2 (fr) * 2004-04-09 2005-10-27 Hybra-Drive Systems, Llc Pompe/moteur a capacite variable
NL1027440C2 (nl) * 2004-11-08 2006-05-09 Tjerk Kingma Vloeistofpomp en werkwijze voor het verplaatsen van een vloeistof.
US8011910B2 (en) * 2005-02-22 2011-09-06 Limo-Reid, Inc. Low noise gear set for gear pump
US7686601B2 (en) * 2005-04-08 2010-03-30 Limo-Reid, Inc. High pressure telescoping gear pumps and motors
JP5230971B2 (ja) * 2006-08-15 2013-07-10 株式会社Tbk ギヤポンプ
US7717690B2 (en) * 2006-08-15 2010-05-18 Tbk Co., Ltd. Gear pump
IT1394335B1 (it) * 2009-04-15 2012-06-06 Vhit Spa Macchina fluidica a capacita' variabile
US20110129359A1 (en) * 2009-11-30 2011-06-02 Caterpillar Inc. Variable output pump
RU2010102009A (ru) * 2010-01-25 2011-07-27 Александр Владимирович Дидин (RU) Объемная роторная машина (варианты)
EP2558724A2 (fr) * 2010-04-12 2013-02-20 FIGURA, Pavol Pompe a engrenages a debit de sortie variable"en continu
US20120051950A1 (en) * 2010-08-27 2012-03-01 Chang Chun-Hsien Engine oil pump provided automatic adjustment of oil supply amount
CN105275787A (zh) * 2014-07-16 2016-01-27 张龙 一种液压变量泵
WO2018048993A1 (fr) * 2016-09-08 2018-03-15 Nordson Corporation Système et procédé de commande active de recirculation d'adhésif
US10695779B2 (en) 2016-09-08 2020-06-30 Nordson Corporation Applicator having active backpressure control devices
US10464098B2 (en) * 2016-09-08 2019-11-05 Nordson Corporation Remote metering station
DE102021100341A1 (de) 2021-01-12 2022-07-14 Schaeffler Technologies AG & Co. KG Außenzahnradmaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE511495C (de) * 1928-03-01 1930-10-30 Valentin Retterath Fluessigkeitsgetriebe
US2633806A (en) * 1947-02-08 1953-04-07 Frank M Perkins Hydraulic transmission
FR1125992A (fr) * 1955-05-07 1956-11-12 Forges Chantiers Mediterranee Perfectionnement aux pompes ou moteurs à engrenages
FR1263424A (fr) * 1960-04-30 1961-06-09 Perfectionnements aux machines rotatives hydrauliques à engrenages et systèmes dérivés, en vue de rendre leur débit variable
US3588295A (en) * 1969-08-29 1971-06-28 Lowell E Burk Variable output gear pump or motor apparatus
FR2232956A5 (en) * 1973-06-05 1975-01-03 Snecma Variable supply gear pump - has internally toothed ring on one gear preventing direct return of fluid
DE3528651A1 (de) * 1985-08-09 1987-02-19 Rohs Hans Guenther Prof Dr Ing Zahnradpumpe
US5184947A (en) * 1991-05-21 1993-02-09 Dwight Coombe Fully variable output hydraulic gear pump having an axially translatable gear
DE4121074A1 (de) * 1991-06-26 1993-01-07 Pierburg Gmbh Aussenzahnradpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9423209A1 *

Also Published As

Publication number Publication date
DE4310518C1 (de) 1994-07-28
KR960702064A (ko) 1996-03-28
WO1994023209A1 (fr) 1994-10-13
US5620315A (en) 1997-04-15
JPH09502234A (ja) 1997-03-04

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