EP2249033B1 - Egalisation du débit dans des pompes volumétriques oscillantes - Google Patents

Egalisation du débit dans des pompes volumétriques oscillantes Download PDF

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Publication number
EP2249033B1
EP2249033B1 EP10004530.1A EP10004530A EP2249033B1 EP 2249033 B1 EP2249033 B1 EP 2249033B1 EP 10004530 A EP10004530 A EP 10004530A EP 2249033 B1 EP2249033 B1 EP 2249033B1
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EP
European Patent Office
Prior art keywords
supply
positive
pressure
displacement
phase
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EP10004530.1A
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German (de)
English (en)
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EP2249033A2 (fr
EP2249033A3 (fr
Inventor
Matthias Sauter
Matthias Dörling
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Lewa GmbH
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Lewa GmbH
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Publication of EP2249033A3 publication Critical patent/EP2249033A3/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0041—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation by piston speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed

Definitions

  • the invention relates to a method for equalizing the flow rate in oscillating positive displacement pumps according to the preamble of claim 1.
  • the invention also relates to an apparatus for carrying out this method according to the preamble of claim 5.
  • the DE 41 30 295 A1 discloses a pumping device with two parallel piston pumps, each having its own drive.
  • the two piston pumps are operated via a common control device in such a way that the most constant possible delivery flow is achieved.
  • the drive of each of the piston pumps via its own synchronous motor, which translates the rotational movement of the output shaft of the synchronous motor in a translation of a piston rod of the respective piston pump via a threaded spindle.
  • the DE 198 49 785 C1 discloses a method for adjusting the flow rate in oscillating displacement pumps whose drive is effected by means of a drive motor via a shaft and a crank gear. Up to three characteristics of the pump are controlled by means of the drive motor: the stroke frequency, the stroke length and the flow characteristic, Why the drive motor is variable both in its speed and in its direction of rotation.
  • the invention is therefore based on the object, the method of the generic type to eliminate the disadvantages described in such a way that it makes it possible to achieve a largely uniform or constant flow rate by means of simple constructive means with reasonable economic effort.
  • an apparatus for performing this method is to be created, which is easy to operate.
  • the inventive method for equalizing the flow in oscillating displacement pumps is based on the essential idea that the generation of the fluid flow in a delivery line by means of at least two oscillating displacement, whose drive motors are controlled so that the total flow generated in the delivery line largely uniform or constant is.
  • the displacement pumps are operated in a composite with each other without mechanical coupling.
  • the positive displacement pumps are operated so electronically synchronized that a nearly pulsation-free uniform flow (volume flow) is generated in the common delivery line.
  • the method according to the invention is operated in such a way that the speed of the drive motor of each displacement pump is changed in such a way that the superposed flow rates of the positive displacement pumps produce a substantially constant total flow rate.
  • the shaft of the drive motor of each positive displacement pump to achieve the constant characteristic of the total flow rate performs an adapted rotational movement.
  • the inventive device for carrying out the aforementioned method is provided with at least two oscillating displacement pumps, the pressure lines are connected to superimpose the individual flow rates to a common feed line and each having a drive motor without mechanical coupling in electronic synchronization to achieve a largely uniform or constant sum flow are operable.
  • the drive of each displacement pump is a highly dynamic drive.
  • This may be a servo motor, preferably a permanent-magnet three-phase synchronous servo motor.
  • the displacement pumps are diaphragm pumps.
  • FIG. 1 The drawing shows, for performing the method according to the invention in the illustrated embodiment, two oscillating positive displacement pumps in the form of diaphragm pumps 1, 2 are provided, the pressure lines 3, 4 are connected to a common feed line 5.
  • the mechanically uncoupled diaphragm pumps 1, 2 each have a drive motor 6 and 7, which is designed as a highly dynamic drive.
  • This is preferably a servo motor, in particular a permanent-magnet three-phase synchronous servo motor.
  • the drive motors 6, 7 of the two diaphragm pumps 1, 2 are operated by exact electronic synchronization such that a substantially uniform or constant sum flow in the common delivery line 5 can be achieved.
  • FIG Fig. 2a-d This procedure, which is operated by the method not covered by the invention, is illustrated by the individual diagrams in FIG Fig. 2a-d shown, in which the pump delivery is 100% each.
  • the respective left half of the diagrams represent the respective measured value course during the pressure stroke of the diaphragm pump 1, while the corresponding right half of the diagram shows the measured value course in dashed form during the pressure stroke of the diaphragm pump 2.
  • Diagram 2a shows the course of the piston travel over the time t for both diaphragm pumps 1, 2. Since this is a linear course due to the special operation of the drive motors 6, 7 of the two diaphragm pumps 1, 2, the result is as follows Fig. 2b can be seen, a constant piston speed.
  • the diagrams according to Fig. 3a-c show different measurements of the diaphragm pump 1 (solid line) and the diaphragm pump 2 (dashed line), respectively apply over time t, the diaphragm pumps 1, 2 each have only a reduced flow rate of about 90%.
  • the diagram shows according to Fig. 3a the fluid velocity applied over time t without compensation of the loss due to the "dead compression path hK" occurring at the beginning of the pressure stroke.
  • the pump piston is brought after completion of the suction stroke in the position hK before the actual delivery stroke begins.
  • the piston travel then starts at hK, ie the fluid is displaced immediately in the pressure stroke.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Claims (7)

  1. Procédé pour l'égalisation du débit refoulé dans des pompes volumétriques oscillantes, dont l'entraînement a lieu au moyen d'un moteur d'entraînement (6, 7) via un arbre excentrique en rotation, dans lequel la génération du débit de fluide refoulé dans un conduit de refoulement (5) a lieu au moyen d'au moins deux pompes volumétriques oscillantes, de sorte que les pompes volumétriques exécutent un cycle de refoulement avec une course d'aspiration et avec une course de compression, dans lesquelles la course de compression comprend une phase de compression dans laquelle un fluide aspiré est comprimé depuis la pression d'aspiration d'une course d'aspiration précédente jusqu'à une pression de refoulement, et une phase de refoulement dans laquelle une partie du fluide comprimé est chassée, caractérisé en ce que leurs moteurs d'entraînement (6, 7) sont commandés de telle façon que le débit refoulé engendré au total dans le conduit de refoulement (5) est largement égalisé ou constant, en faisant varier la vitesse angulaire des arbres excentriques de chacun des moteurs d'entraînement (6, 7) à l'intérieur de la phase de refoulement de la course de compression de telle façon qu'il en résulte une vitesse sensiblement constante du piston de la pompe volumétrique associée, et il se produit une compensation de la course de compression morte (hK) parcourue dans la phase de compression du fait qu'à la fin de la course de compression de l'une des pompes volumétriques commence la phase de refoulement de l'autre pompe volumétrique.
  2. Procédé selon la revendication 1, caractérisé en ce que les pompes volumétriques sont amenées à fonctionner en groupe ensemble sans couplage mécanique.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les pompes volumétriques sont amenées à fonctionner de manière synchronisée par voie électronique de telle façon que l'on engendre dans le conduit de refoulement commun (5) un débit de refoulement (débit volumétrique) régulier pratiquement dépourvu de pulsation.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la course de compression morte (hK) est déterminée automatiquement.
  5. Dispositif pour la mise en oeuvre d'un procédé selon l'une des revendications précédentes, comprenant au moins deux pompes volumétriques oscillantes qui exécutent un cycle de refoulement avec une course d'aspiration et une course de compression, dans lesquelles la course de compression comprend une phase de compression dans laquelle un fluide aspiré est comprimé depuis la pression d'aspiration d'une course d'aspiration précédente jusqu'à la pression de refoulement, et une phase de refoulement dans laquelle une partie du fluide comprimé est chassée, dont les conduits sous pression (3, 4) sont branchés, pour superposer les débits de refoulement individuels, à un conduit de refoulement commun (5), et qui comprennent respectivement un moteur d'entraînement (6, 7) avec un arbre excentrique, caractérisé en ce que les moteurs d'entraînement (6, 7) sont susceptibles d'être amenés à fonctionner sans couplage mécanique en synchronisation électronique pour atteindre un débit de refoulement total largement égalisé ou constant, dans lequel la vitesse angulaire des arbres excentriques de chacun des moteurs d'entraînement (6, 7) est variée à l'intérieur de la phase de refoulement d'une course de compression de telle façon qu'il en résulte une vitesse sensiblement constante du piston de la pompe volumétrique associée, et il se produit une compensation de la course de compression morte (hK) parcourue dans la phase de compression du fait qu'à la fin de la course de compression de l'une des pompes volumétriques commence la phase de refoulement de l'autre pompe volumétrique.
  6. Dispositif selon la revendication 5, caractérisé en ce que le moteur d'entraînement (6, 7) de chaque pompe volumétrique oscillante (1, 2) est un entraînement fortement dynamique, en particulier un servomoteur, et de préférence un servomoteur synchrone triphasé à excitation permanente.
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que les pompes volumétriques oscillantes sont des pompes à membrane (1, 2).
EP10004530.1A 2009-05-08 2010-04-29 Egalisation du débit dans des pompes volumétriques oscillantes Active EP2249033B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009020414A DE102009020414A1 (de) 2009-05-08 2009-05-08 Vergleichmäßigung des Förderstroms bei oszillierenden Verdrängerpumpen

Publications (3)

Publication Number Publication Date
EP2249033A2 EP2249033A2 (fr) 2010-11-10
EP2249033A3 EP2249033A3 (fr) 2011-11-02
EP2249033B1 true EP2249033B1 (fr) 2014-11-12

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EP10004530.1A Active EP2249033B1 (fr) 2009-05-08 2010-04-29 Egalisation du débit dans des pompes volumétriques oscillantes

Country Status (5)

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US (1) US20100284827A1 (fr)
EP (1) EP2249033B1 (fr)
JP (1) JP5567385B2 (fr)
DE (1) DE102009020414A1 (fr)
ES (1) ES2529678T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
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DE102011051028A1 (de) 2011-06-10 2012-12-13 Prominent Dosiertechnik Gmbh Membrandosierpumpe
DE102014008321B3 (de) * 2014-05-30 2015-09-17 Lewa Gmbh Pulsator
JP6570846B2 (ja) * 2015-03-09 2019-09-04 アコマ医科工業株式会社 定量ポンプの駆動方法、定量ポンプの駆動装置、気化器および麻酔装置
EP3538762A1 (fr) * 2016-11-14 2019-09-18 Pagani Geotechnical Equipment S.R.L. Pompe volumétrique
TWI650284B (zh) * 2017-09-30 2019-02-11 Microjet Technology Co., Ltd 流體裝置之控制方法
RU2761258C1 (ru) * 2020-06-30 2021-12-06 Публичное акционерное общество "ОДК-Уфимское моторостроительное производственное объединение" (ПАО "ОДК-УМПО") Устройство выравнивания нагрузки

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Also Published As

Publication number Publication date
US20100284827A1 (en) 2010-11-11
JP2010261461A (ja) 2010-11-18
EP2249033A2 (fr) 2010-11-10
ES2529678T3 (es) 2015-02-24
DE102009020414A1 (de) 2010-11-11
EP2249033A3 (fr) 2011-11-02
JP5567385B2 (ja) 2014-08-06

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