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EP1602826A1 - Pump drive - Google Patents

Pump drive Download PDF

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Publication number
EP1602826A1
EP1602826A1 EP04405346A EP04405346A EP1602826A1 EP 1602826 A1 EP1602826 A1 EP 1602826A1 EP 04405346 A EP04405346 A EP 04405346A EP 04405346 A EP04405346 A EP 04405346A EP 1602826 A1 EP1602826 A1 EP 1602826A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump drive
rotor
pump
drive 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.)
Granted
Application number
EP04405346A
Other languages
German (de)
French (fr)
Other versions
EP1602826B1 (en
Inventor
Jean-François Pfister
Joel Niklaus
Christophe Dexet
Vincent Froidevaux
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.)
Sonceboz SA
Societe Industrielle de Sonceboz SA
Original Assignee
Sonceboz SA
Societe Industrielle de Sonceboz SA
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 Sonceboz SA, Societe Industrielle de Sonceboz SA filed Critical Sonceboz SA
Priority to AT04405346T priority Critical patent/ATE365868T1/en
Priority to EP04405346A priority patent/EP1602826B1/en
Priority to DE602004007247T priority patent/DE602004007247T2/en
Priority to US11/139,911 priority patent/US20050244276A1/en
Publication of EP1602826A1 publication Critical patent/EP1602826A1/en
Application granted granted Critical
Publication of EP1602826B1 publication Critical patent/EP1602826B1/en
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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the present invention relates to a diaphragm pump drive or to a piston, with a stepper motor.
  • the stepper motor has the advantage of allowing, by electronic means, better control the flow of pumped fluid, since the stepper motor allows a fine control of the motor rotation speed, as well as to know the angular position of the rotor without requiring an external sensor for this purpose.
  • the pumped fluid flow can be varied by changing the rotational speed of the motor rotor, which varies the return frequency of the piston coupled to the rotor through a mechanism to cam.
  • the variation of the return frequency of the piston can have a harmful influence on the pressure variation in the fluid pumped, dependent harmonic frequencies of the hydraulic system in which the pump, and the degree of damping of pulsations or other factors.
  • the mechanical adjustment of the amplitude can have disadvantages on the plane the size and complexity of the system, as well as the adjustment possibilities.
  • An object of the invention is to provide a piston pump drive or membrane can be precisely adjusted over a range of operation extended.
  • a diaphragm pump drive or piston comprising a stepper motor, a reducing device and a mechanism of transformation of the rotary movement into a translational movement, comprising a rotatable member and a piston member for moving a piston or a diaphragm of the pump, the stepping motor comprising a coupled rotor, through the reducing device, to the rotating member, engaging the piston member to drive it in a movement essentially linear motion, characterized in that the stepper motor and the device of translation are adapted to make an angular displacement back and forth of the rotary member of the translation mechanism at an angle less than 360 °.
  • the transformation device may comprise a cam element on the rotating part, engaging a complementary cam on the body essentially linear displacement.
  • the angular rotation angle of the rotary cam element defines the amplitude of the linear displacement of the piston member.
  • the angle of rotation of the cam is electronically adjusted by the motor control step-by-step as well as the control of the speed and accelerations of the motor, without requiring adjustment of mechanical parts.
  • the flow of the pump can be varied not only by changing the frequency of piston stroke, but also its amplitude by a command electronic step-by-step motor, which optimizes the operation of the pump over a wide range of values, that is to say for large and low flow rates, controlling amplitude and / or frequency.
  • the transmission of the engine torque through the gearbox implies that the motor rotor can perform several laps before the change of direction. This allows to obtain a finer control of the angular displacement, in view of the reduction of moving through the gearbox, and better control the boom of deceleration and acceleration, especially when changing direction of rotation.
  • a pump drive 1 comprises a electric stepper motor 2 with a wound stator 3 and a rotor 4, a reducing device 5, a device 6 for transforming the rotary motion into a substantially linear movement, and a piston member 7.
  • the gearbox 5 comprises gear wheels 8, 9, 10, 11 carrying out a reduction of the transmission ratio between the axis 12 of the rotor and the output axis 13 reducer.
  • the transformation mechanism 6 includes an element of cam 14 secured to the output shaft 13 of the reducing and engaging device a complementary cam element 15, in the form of a freewheel, mounted on the piston member 7.
  • the piston member 7 is mounted in a bearing 16 of a body or support 17 of the drive to guide the piston member in a translation movement along an axis A.
  • the cam member 14 is, in this example, in the form of a substantially flat disk comprising a opening 18 whose periphery 19, or at least a part of the periphery, has the function of a cam surface engaging the cam member complementary member 15 mounted on the piston member 7 for the displacement of this last in a back-and-forth motion when the rotary cam member 14 angular displacement back and forth.
  • a first extreme angular position 20a of the cam profile corresponds to an extreme axial position of the body of piston and the other extreme angular position 20b of the cam surface corresponds to the extreme axial position of the piston member in the other direction.
  • the displacement of the cam member between the extreme angular positions 20a, 20b therefore corresponds to the maximum amplitude of the piston member.
  • the opposed surfaces 20c, 20d of the cam allow to push and pull the piston member without requiring a recoil spring, which reduces wear by friction and decreases the number of components. Cam surfaces opposites also allow for strong accelerations and decelerations.
  • the flow of the pump can be varied, by acting on the number of steps performed by the stepper motor rotor before the change of direction, by an electronic command counting the number of steps and controlling the deceleration, stopping and acceleration in the other direction of the stepper motor rotor.
  • We can still vary the pumped flow by varying the speed of the movement of the piston member by electronically controlling the pitch frequency of the step-by-step engine.
  • a speed profile asymmetrical back-and-forth movement by controlling, by means of electronic control, the movement in one direction of rotation with a frequency of step different from the frequency in the other direction of rotation.
  • a asymmetric displacement profile can be very advantageous to optimize aspiration and expulsion of the liquid by the piston according to the characteristics of the pump and hydraulic system, for example, for avoid cavitation during suction or shock or vibration during expulsion.
  • stepper motor not only has the advantage of enable a very reliable and precise electronic control of the amplitude and of the frequency according to a desired speed profile, but also to generate a high torque at relatively low rotational speeds.
  • the electronic engine control can be done through a low noise motor driver to avoid the known resonances of stepper motors as well as optimize efficiency of the motor.
  • We can reduce its heating by varying the current according to the operating state, for example by switching off the power at reducing the current during the suction cycle of the pump in case of low pressure and providing a high or nominal current during the cycle expulsion of the pump in a situation of high hydraulic pressure.
  • the reducing device makes it possible to reduce the bulk of the engine while improving the rotor acceleration and deceleration ramps, as well as the positioning accuracy of the cam member, and consequently the amplitude and the displacement frequency of the piston member.
  • the reducing device also makes it possible to absorb shocks, in particular during changes of direction.
  • the output axis 13 of the reducing device is provided with a bearing under form of a needle bearing 21 with a small footprint.
  • the element of complementary cam 15 of the piston member 7 is also mounted on a bearing in the form of a needle bearing 22 to reduce friction between the cam surface 20 and this piece. It should be noted that the element of complementary cam 15 has a diameter slightly less than the distance radial separating the surfaces of the opposite cams 20c, 20d, this weak game to avoid friction of the complementary cam element against the cam surface opposite to the engaging cam surface.
  • a cam system it is also possible to transform the rotary motion at the outlet of the reducing device by a connecting rod system, that is to say where the piston member is interconnected to a solid disc of the output axis of the reducing device, by a coupled joint so pivoting to the disc and the piston member.
  • the piston does not need to translate pure, from the moment when there is a moving component in one direction perpendicular to the general plane of the membrane in order to vary the volume pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Transmission Devices (AREA)
  • Valve Device For Special Equipments (AREA)
  • Seal Device For Vehicle (AREA)

Abstract

The drive has a rotary-to-linear conversion mechanism to convert rotary into translation movement. The mechanism has a rotary unit and a piston unit (7) that is intended to move a piston of a pump. A stepping motor (2) engages the piston unit to drive it in a linear reciprocating movement. The motor and the mechanism drive the rotary unit in a reciprocating angular movement at an angle of less than 360 degrees. An independent claim is also included for a method of controlling a pump drive.

Description

La présente invention concerne un entraínement de pompe à membrane ou à piston, avec un moteur pas-à-pas.The present invention relates to a diaphragm pump drive or to a piston, with a stepper motor.

Des entraínements du type précité sont connus et décrits par exemple dans le brevet allemand DE 196 23 537 ou le brevet américain US 4,326,837. La publication DE 196 23 537 décrit une pompe à membrane comprenant un piston effectuant un mouvement va-et-vient au moyen d'un système à cames entraíné par un moteur pas-à-pas à travers des roues d'engrenage, ce moteur étant contrôlé par un microprocesseur.Trainings of the aforementioned type are known and described for example in the German patent DE 196 23 537 or US Pat. No. 4,326,837. The publication DE 196 23 537 discloses a diaphragm pump comprising a piston moving back and forth by means of a cam system Driven by a stepper motor through gear wheels, this motor being controlled by a microprocessor.

Par rapport aux entraínements de pompe à moteur continu, le moteur pas-à-pas a l'avantage de permettre, par des moyens électroniques, de mieux commander le débit de fluide pompé, puisque le moteur pas-à-pas permet un contrôle fin de la vitesse de rotation du moteur, ainsi que de connaítre la position angulaire du rotor sans nécessiter de capteur externe à cet effet.Compared to continuous motor pump drives, the stepper motor has the advantage of allowing, by electronic means, better control the flow of pumped fluid, since the stepper motor allows a fine control of the motor rotation speed, as well as to know the angular position of the rotor without requiring an external sensor for this purpose.

Dans les pompes avec moteur pas-à-pas, le débit de fluide pompé peut être varié en changeant la vitesse de rotation du rotor du moteur, ce qui varie la fréquence d'aller-retour du piston couplé au rotor à travers un mécanisme à came. La variation de la fréquence d'aller-retour du piston peut avoir une influence néfaste sur la variation de pression dans le fluide pompé, dépendant des fréquences harmoniques du système hydraulique dans lequel est placée la pompe, et du degré d'amortissement des pulsations ou encore d'autres facteurs.In pumps with stepper motor, the pumped fluid flow can be varied by changing the rotational speed of the motor rotor, which varies the return frequency of the piston coupled to the rotor through a mechanism to cam. The variation of the return frequency of the piston can have a harmful influence on the pressure variation in the fluid pumped, dependent harmonic frequencies of the hydraulic system in which the pump, and the degree of damping of pulsations or other factors.

Un autre moyen connu de varier le débit pompé dans des pompes à membrane ou à piston est le réglage de l'amplitude de déplacement du piston par des moyens mécaniques, tels que décrits dans la demande de brevet européen EP 1 283 366. Dans cette demande, l'amplitude du mouvement des pistons est réglée en ajustant l'excentricité des cames qui déplacent les pistons.Another known way of varying the flow rate pumped into diaphragm pumps or piston is the adjustment of the amplitude of displacement of the piston by mechanical means, as described in the European patent application EP 1 283 366. In this application, the amplitude of the movement of the pistons is adjusted by adjusting the eccentricity of the cams that move the pistons.

L'ajustement mécanique de l'amplitude peut avoir des inconvénients sur le plan de l'encombrement et de la complexité du système, ainsi que sur les possibilités de réglage.The mechanical adjustment of the amplitude can have disadvantages on the plane the size and complexity of the system, as well as the adjustment possibilities.

Un but de l'invention est de fournir un entraínement de pompe à piston ou à membrane pouvant être réglé avec précision sur une plage de fonctionnement étendue.An object of the invention is to provide a piston pump drive or membrane can be precisely adjusted over a range of operation extended.

Il est avantageux de fournir un entraínement de pompe permettant de limiter les vibrations et les variations de pression du fluide débité.It is advantageous to provide a pump drive to limit the vibrations and pressure variations of the fluid delivered.

Il est avantageux de fournir un entraínement de pompe à piston ou à membrane qui est très précise et réactive afin de permettre de modifier le débit de fluide débité très rapidement.It is advantageous to provide a piston pump drive or membrane that is very accurate and responsive to allow you to change the flow fluid flow very quickly.

II est avantageux de fournir un entraínement de pompe à piston ou à membrane versatile et peu encombrante.It is advantageous to provide a piston pump drive or Versatile and compact membrane.

Des buts de l'invention sont réalisés par l'entraínement de pompe à piston ou à membrane selon la revendication 1.Objects of the invention are achieved by the piston pump drive or membrane according to claim 1.

Dans la présente invention, un entraínement de pompe à membrane ou à piston comprenant un moteur pas-à-pas, un dispositif réducteur et un mécanisme de transformation du mouvement rotatif en mouvement translatif, comprenant un organe rotatif et un organe de piston destiné à déplacer un piston ou une membrane de la pompe, le moteur pas-à-pas comprenant un rotor couplé, à travers le dispositif réducteur, à l'organe rotatif, engageant l'organe de piston afin de l'entraíner dans un mouvement essentiellement linéaire de va-et-vient, caractérisé en ce que le moteur pas-à-pas et le dispositif de translation sont adaptés pour effectuer un déplacement angulaire d'aller-retour de l'organe rotatif du mécanisme de translation sous un angle inférieur à 360°.In the present invention, a diaphragm pump drive or piston comprising a stepper motor, a reducing device and a mechanism of transformation of the rotary movement into a translational movement, comprising a rotatable member and a piston member for moving a piston or a diaphragm of the pump, the stepping motor comprising a coupled rotor, through the reducing device, to the rotating member, engaging the piston member to drive it in a movement essentially linear motion, characterized in that the stepper motor and the device of translation are adapted to make an angular displacement back and forth of the rotary member of the translation mechanism at an angle less than 360 °.

Le dispositif de transformation peut comprendre un élément de came sur la partie rotative, engageant une came complémentaire sur l'organe à déplacement essentiellement linéaire.The transformation device may comprise a cam element on the rotating part, engaging a complementary cam on the body essentially linear displacement.

L'angle de rotation angulaire de l'élément de came rotatif définit l'amplitude du déplacement linéaire de l'organe de piston. Avantageusement, l'angle de rotation de la came est réglé électroniquement par la commande du moteur pas-à-pas à même titre que la commande de la vitesse et des accélérations du moteur, sans nécessiter un réglage d'organes mécaniques. Le débit de la pompe peut ainsi être varié non seulement en changeant la fréquence de battement du piston, mais également son amplitude par une commande électronique du moteur pas-à-pas, ce qui permet d'optimiser le fonctionnement de la pompe sur une grande plage de valeurs, c'est-à-dire pour des grands et des faibles débits, en contrôlant l'amplitude et/ou la fréquence.The angular rotation angle of the rotary cam element defines the amplitude of the linear displacement of the piston member. Advantageously, the angle of rotation of the cam is electronically adjusted by the motor control step-by-step as well as the control of the speed and accelerations of the motor, without requiring adjustment of mechanical parts. The flow of the pump can be varied not only by changing the frequency of piston stroke, but also its amplitude by a command electronic step-by-step motor, which optimizes the operation of the pump over a wide range of values, that is to say for large and low flow rates, controlling amplitude and / or frequency.

Au lieu d'un mécanisme à came, il est également possible d'utiliser un système à bielle, c'est-à-dire que l'organe à déplacement linéaire est fixé au moyen d'une articulation pivotante sur la pièce rotative à la sortie du réducteur.Instead of a cam mechanism, it is also possible to use a system connecting rod, that is to say that the linear displacement member is fixed by means of a pivoting joint on the rotating part at the outlet of the gearbox.

La transmission du couple moteur à travers le réducteur, qui peut être sous forme de roues d'engrenage, implique que le rotor du moteur peut effectuer plusieurs tours avant le changement de direction. Ceci permet d'obtenir un contrôle plus fin du déplacement angulaire, au vu de la réduction du déplacement à travers le réducteur, et de mieux contrôler la rampe de décélération et d'accélération, notamment lors du changement de direction de rotation. The transmission of the engine torque through the gearbox, which can be under form of gear wheels, implies that the motor rotor can perform several laps before the change of direction. This allows to obtain a finer control of the angular displacement, in view of the reduction of moving through the gearbox, and better control the boom of deceleration and acceleration, especially when changing direction of rotation.

D'autres buts et caractéristiques avantageuses de l'invention ressortiront des revendications, de la description et des dessins annexes, dans lesquels:

  • la Fig. 1 est une vue en perspective d'un entraínement de pompe à piston ou à membrane selon l'invention;
  • la Fig. 2a est une vue en plan de l'entraínement de pompe montrant une première position extrême du déplacement du piston;
  • la Fig. 2b est une vue similaire à la Fig. 2a montrant le piston dans la deuxième position extrême;
  • la Fig. 3 est une vue de l'entraínement dans la direction III de la Fig. 2b, avec plaque de support en sus; et
  • la Fig. 4 est une coupe selon la ligne IV-IV de la Fig. 2a, avec plaque de support en sus.
    • Other objects and advantageous features of the invention will emerge from the claims, the description and the accompanying drawings, in which:
  • FIG. 1 is a perspective view of a piston pump or diaphragm pump according to the invention;
  • FIG. 2a is a plan view of the pump drive showing a first extreme position of piston displacement;
  • FIG. 2b is a view similar to FIG. 2a showing the piston in the second extreme position;
  • FIG. 3 is a view of the drive in direction III of FIG. 2b, with support plate in addition; and
  • FIG. 4 is a section along the line IV-IV of FIG. 2a, with support plate in addition.

    • Faisant référence aux figures, un entraínement de pompe 1 comprend un moteur électrique pas-à-pas 2 avec un stator bobiné 3 et un rotor 4, un dispositif réducteur 5, un dispositif de transformation 6 du mouvement rotatif en un mouvement essentiellement linéaire, et un organe de piston 7.Referring to the figures, a pump drive 1 comprises a electric stepper motor 2 with a wound stator 3 and a rotor 4, a reducing device 5, a device 6 for transforming the rotary motion into a substantially linear movement, and a piston member 7.

    Le réducteur 5 comprend des roues d'engrenage 8, 9, 10, 11 effectuant une réduction du rapport de transmission entre l'axe 12 du rotor et l'axe de sortie 13 du réducteur. Le mécanisme de transformation 6 comprend un élément de came 14 solidaire avec l'axe de sortie 13 du dispositif réducteur et engageant un élément de came complémentaire 15, sous forme de roue libre, monté sur l'organe de piston 7. L'organe de piston 7 est monté dans un palier 16 d'un corps ou support 17 de l'entraínement afin de guider l'organe de piston dans un mouvement de translation selon une axe A. L'organe de came 14 est, dans cet exemple, sous forme d'un disque essentiellement plat comprenant une ouverture 18 dont la périphérie 19, ou tout au moins une partie de la périphérie, a la fonction d'une surface de came engageant l'élément de came complémentaire 15 monté sur l'organe de piston 7 pour le déplacement de ce dernier dans un mouvement va-et-vient lorsque l'organe de came rotatif 14 effectue un déplacement angulaire d'aller-retour. Le profil de la surface de came 20, défini par la position angulaire de chaque point de la surface et sa distance radiale par rapport à l'axe de rotation de l'organe 14, définit la position axiale de l'organe de piston 7.The gearbox 5 comprises gear wheels 8, 9, 10, 11 carrying out a reduction of the transmission ratio between the axis 12 of the rotor and the output axis 13 reducer. The transformation mechanism 6 includes an element of cam 14 secured to the output shaft 13 of the reducing and engaging device a complementary cam element 15, in the form of a freewheel, mounted on the piston member 7. The piston member 7 is mounted in a bearing 16 of a body or support 17 of the drive to guide the piston member in a translation movement along an axis A. The cam member 14 is, in this example, in the form of a substantially flat disk comprising a opening 18 whose periphery 19, or at least a part of the periphery, has the function of a cam surface engaging the cam member complementary member 15 mounted on the piston member 7 for the displacement of this last in a back-and-forth motion when the rotary cam member 14 angular displacement back and forth. The profile of the surface of cam 20, defined by the angular position of each point of the surface and its radial distance relative to the axis of rotation of the member 14, defines the position axial axis of the piston member 7.

    Dans la forme d'exécution préférée, une première position angulaire extrême 20a du profil de cames correspond à une position axiale extrême de l'organe de piston et l'autre position angulaire extrême 20b de la surface de came correspond à la position axiale extrême de l'organe de piston dans l'autre sens. Le déplacement de l'organe de cames entre les positions angulaires extrêmes 20a, 20b correspond donc à l'amplitude maximale de l'organe de piston. Les surfaces opposées 20c, 20d de la came permettent de pousser et de tirer l'organe de piston sans nécessiter un ressort de recul, ce qui réduit l'usure par frottement et diminue le nombre de composants. Les surfaces de came opposées permettent également d'effectuer de fortes accélérations et décélérations.In the preferred embodiment, a first extreme angular position 20a of the cam profile corresponds to an extreme axial position of the body of piston and the other extreme angular position 20b of the cam surface corresponds to the extreme axial position of the piston member in the other direction. The displacement of the cam member between the extreme angular positions 20a, 20b therefore corresponds to the maximum amplitude of the piston member. The opposed surfaces 20c, 20d of the cam allow to push and pull the piston member without requiring a recoil spring, which reduces wear by friction and decreases the number of components. Cam surfaces opposites also allow for strong accelerations and decelerations.

    Le débit de la pompe peut-être varié, en agissant sur le nombre de pas effectués par le rotor du moteur pas-à-pas avant le changement de direction, par une commande électronique comptant le nombre de pas et contrôlant la décélération, l'arrêt et l'accélération dans l'autre sens du rotor du moteur pas-à-pas. On peut encore varier le débit pompé en variant la vitesse du mouvement de l'organe de piston en contrôlant électroniquement la fréquence des pas du moteur pas-à-pas.The flow of the pump can be varied, by acting on the number of steps performed by the stepper motor rotor before the change of direction, by an electronic command counting the number of steps and controlling the deceleration, stopping and acceleration in the other direction of the stepper motor rotor. We can still vary the pumped flow by varying the speed of the movement of the piston member by electronically controlling the pitch frequency of the step-by-step engine.

    Avec le dispositif selon l'invention, il est possible d'obtenir un profil de vitesse du mouvement va-et-vient asymétrique en contrôlant, au moyen de la commande électronique, le mouvement dans un sens de rotation avec une fréquence de pas différente de la fréquence dans l'autre sens de rotation. Un profil de déplacement asymétrique peut être très avantageux pour optimiser l'aspiration et l'expulsion du liquide par le piston en fonction des caractéristiques de la pompe et du système hydraulique, par exemple, pour éviter la cavitation lors de l'aspiration ou les chocs ou vibrations lors de l'expulsion.With the device according to the invention, it is possible to obtain a speed profile asymmetrical back-and-forth movement by controlling, by means of electronic control, the movement in one direction of rotation with a frequency of step different from the frequency in the other direction of rotation. A asymmetric displacement profile can be very advantageous to optimize aspiration and expulsion of the liquid by the piston according to the characteristics of the pump and hydraulic system, for example, for avoid cavitation during suction or shock or vibration during expulsion.

    L'usage d'un moteur pas-à-pas présente non seulement l'avantage de permettre une commande électronique très fiable et précise de l'amplitude et de la fréquence selon un profil de vitesse voulu, mais également de générer un couple élevé à des vitesses de rotation relativement faibles.The use of a stepper motor not only has the advantage of enable a very reliable and precise electronic control of the amplitude and of the frequency according to a desired speed profile, but also to generate a high torque at relatively low rotational speeds.

    Avantageusement, la commande électronique du moteur peut se faire à travers une commande d'alimentation à faible bruit (low noise motor driver) afin d'éviter les résonances connues des moteurs pas-à-pas ainsi que d'optimiser l'efficacité du moteur. On peut donc réduire son échauffement en variant le courant selon l'état de fonctionnement, par exemple en coupant le courant à l'arrêt, en réduisant le courant lors du cycle d'aspiration de la pompe en cas de faible pression et en fournissant un courant élevé ou nominal lors du cycle d'expulsion de la pompe en situation de grande pression hydraulique.Advantageously, the electronic engine control can be done through a low noise motor driver to avoid the known resonances of stepper motors as well as optimize efficiency of the motor. We can reduce its heating by varying the current according to the operating state, for example by switching off the power at reducing the current during the suction cycle of the pump in case of low pressure and providing a high or nominal current during the cycle expulsion of the pump in a situation of high hydraulic pressure.

    Le dispositif réducteur permet de diminuer l'encombrement du moteur tout en améliorant les rampes d'accélération et de décélération du rotor, ainsi que la précision de positionnement de l'organe de came, et par conséquence l'amplitude et la fréquence de déplacement de l'organe de piston.The reducing device makes it possible to reduce the bulk of the engine while improving the rotor acceleration and deceleration ramps, as well as the positioning accuracy of the cam member, and consequently the amplitude and the displacement frequency of the piston member.

    Le dispositif réducteur permet également d'absorber des chocs, notamment lors des changements de direction. Afin de pouvoir supporter les fortes charges radiales, l'axe de sortie 13 du dispositif réducteur est muni d'un palier sous forme d'un roulement à aiguilles 21 avec un faible encombrement. L'élément de came complémentaire 15 de l'organe de piston 7 est également monté sur un palier sous forme d'un roulement à aiguilles 22 afin de réduire le frottement entre la surface de came 20 et cette pièce. II est à remarquer que l'élément de came complémentaire 15 a un diamètre légèrement inférieur à la distance radiale séparant les surfaces des cames opposées 20c, 20d, ce faible jeu permettant d'éviter un frottement de l'élément de came complémentaire contre la surface de came opposée à la surface de came engageante.The reducing device also makes it possible to absorb shocks, in particular during changes of direction. In order to support heavy loads radial, the output axis 13 of the reducing device is provided with a bearing under form of a needle bearing 21 with a small footprint. The element of complementary cam 15 of the piston member 7 is also mounted on a bearing in the form of a needle bearing 22 to reduce friction between the cam surface 20 and this piece. It should be noted that the element of complementary cam 15 has a diameter slightly less than the distance radial separating the surfaces of the opposite cams 20c, 20d, this weak game to avoid friction of the complementary cam element against the cam surface opposite to the engaging cam surface.

    Au lieu d'un système à came, il est également possible de transformer le mouvement rotatif à la sortie du dispositif réducteur par un système à bielle, c'est-à-dire où l'organe de piston est interconnecté à un disque solidaire de l'axe de sortie du dispositif réducteur, par une articulation couplée de manière pivotante au disque et à l'organe de piston. Il convient de souligner que l'organe de piston ne doit pas nécessairement effectuer un mouvement de translation pure, du moment où il y a un composant de déplacement dans une direction perpendiculaire au plan général de la membrane afin de faire varier le volume de la pompe.Instead of a cam system, it is also possible to transform the rotary motion at the outlet of the reducing device by a connecting rod system, that is to say where the piston member is interconnected to a solid disc of the output axis of the reducing device, by a coupled joint so pivoting to the disc and the piston member. It should be emphasized that the piston does not need to translate pure, from the moment when there is a moving component in one direction perpendicular to the general plane of the membrane in order to vary the volume pump.

    Claims (9)

    Entraínement de pompe à membrane ou à piston comprenant un moteur pas-à-pas (2) et un mécanisme de transformation du mouvement rotatif en mouvement translatif (6), comprenant un organe rotatif (4) et un organe de piston (7) destiné à déplacer un piston ou une membrane de la pompe, le moteur pas-à-pas comprenant un rotor couplé à l'organe rotatif, engageant l'organe de piston (7) afin de l'entraíner dans un mouvement essentiellement linéaire de va-et-vient, caractérisé en ce que le moteur pas-à-pas et le dispositif de translation sont adaptés pour effectuer un déplacement angulaire d'aller-retour de l'organe rotatif du mécanisme de translation sous un angle inférieur à 360°.A diaphragm or piston pump drive comprising a stepper motor (2) and a rotary motion converting mechanism (6) comprising a rotary member (4) and a piston member (7) for displacing a piston or a diaphragm of the pump, the stepper motor comprising a rotor coupled to the rotatable member, engaging the piston member (7) to drive it in a substantially linear movement of and forth, characterized in that the stepper motor and the translating device are adapted to effect angular displacement back and forth of the rotational member of the translation mechanism at an angle less than 360 °. Entraínement de pompe selon la revendication 1, caractérisé en ce que l'organe rotatif du mécanisme de translation comprend une surface de cames engageant un élément de came complémentaire fixé à l'organe de piston.Pump drive according to claim 1, characterized in that the rotational member of the translation mechanism comprises a cam surface engaging a complementary cam member attached to the piston member. Entraínement de pompe selon la revendication précédente, caractérisé en ce que la surface de came est formée sur la périphérie d'une ouverture pratiquée dans un élément sous forme de disque solidaire avec l'axe de sortie du dispositif réducteur.Pump drive according to the preceding claim, characterized in that the cam surface is formed on the periphery of an opening in a disk-shaped element integral with the output axis of the reducing device. Entraínement de pompe selon la revendication 2 ou 3, caractérisé en ce que la surface de came (20) comprend des surfaces de cames opposées (20c, 20d) pour effectuer la poussée respectivement le retrait de l'organe de piston sans ressort de recul.Pump drive according to claim 2 or 3, characterized in that the cam surface (20) comprises opposed cam surfaces (20c, 20d) for effecting the pushing or retracting of the piston member respectively without a recoil spring. Entraínement de pompe selon l'une des revendications précédentes,
    caractérisé en ce que le rotor du moteur pas-à-pas est couplé à l'organe rotatif engageant l'organe de piston à travers un dispositif réducteur (5).     Pump drive according to one of the preceding claims,
    characterized in that the rotor of the stepper motor is coupled to the rotatable member engaging the piston member through a reducing device (5).         Entraínement de pompe selon la revendication précédente, caractérisé en ce que le dispositif réducteur comprend un pignon sur l'arbre de sortie du rotor du moteur pas-à-pas couplé à travers de roues d'engrenage à un axe de sortie du dispositif réducteur solidaire de l'organe rotatif du mécanisme de translation.Pump drive according to the preceding claim, characterized in that the reducing device comprises a pinion on the output shaft of the rotor of the stepper motor coupled through gear wheels to an output shaft of the integral reducing device. of the rotary member of the translation mechanism. Entraínement de pompe selon l'une des revendications précédentes,
    caractérisé en ce qu'il comprend une commande électronique apte à contrôler l'amplitude de rotation du rotor dans un sens et dans l'autre ainsi que la fréquence des pas, de manière à générer un profil de vitesse asymétrique, où la vitesse de déplacement linéaire de l'organe de piston dans un sens de l'aspiration du fluide pompé est différente de la vitesse de déplacement de l'organe dans l'autre sens.    Pump drive according to one of the preceding claims,
    characterized in that it comprises an electronic control adapted to control the amplitude of rotation of the rotor in one direction and the other as well as the pitch frequency, so as to generate an asymmetrical speed profile, where the speed of displacement linear of the piston member in one direction of the suction of the pumped fluid is different from the speed of movement of the body in the other direction.         Procédé de commande d'un entraínement de pompe selon l'une des revendications précédentes, caractérisé en ce que le débit de fluide de la pompe est varié en modifiant l'amplitude de déplacement angulaire et/ou la fréquence des pas du rotor dans un sens et dans l'autre.A method of controlling a pump drive according to one of the preceding claims, characterized in that the fluid flow rate of the pump is varied by varying the angular displacement amplitude and / or the pitch frequency of the rotor in a direction and in the other. Procédé selon la revendication précédente, caractérisé en ce que la vitesse de déplacement angulaire du rotor dans un sens est réglée pour être différente de la vitesse dans l'autre sens afin d'obtenir un profil de vitesse pour l'aspiration et l'expulsion de fluide asymétrique.Method according to the preceding claim, characterized in that the speed of angular displacement of the rotor in one direction is adjusted to be different from the speed in the other direction in order to obtain a speed profile for the suction and the expulsion of asymmetric fluid.
    EP04405346A 2004-04-06 2004-06-04 Pump drive Expired - Lifetime EP1602826B1 (en)

    Priority Applications (4)

    Application Number Priority Date Filing Date Title
    AT04405346T ATE365868T1 (en) 2004-06-04 2004-06-04 PUMP DRIVE
    EP04405346A EP1602826B1 (en) 2004-06-04 2004-06-04 Pump drive
    DE602004007247T DE602004007247T2 (en) 2004-06-04 2004-06-04 pump drive
    US11/139,911 US20050244276A1 (en) 2004-04-06 2005-05-27 Pump drive

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP04405346A EP1602826B1 (en) 2004-06-04 2004-06-04 Pump drive

    Publications (2)

    Publication Number Publication Date
    EP1602826A1 true EP1602826A1 (en) 2005-12-07
    EP1602826B1 EP1602826B1 (en) 2007-06-27

    Family

    ID=34932133

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP04405346A Expired - Lifetime EP1602826B1 (en) 2004-04-06 2004-06-04 Pump drive

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    Country Link
    US (1) US20050244276A1 (en)
    EP (1) EP1602826B1 (en)
    AT (1) ATE365868T1 (en)
    DE (1) DE602004007247T2 (en)

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    EP1859169A2 (en) 2004-11-23 2007-11-28 Entegris, Inc. System and method for a variable home position dispense system
    CN103016324B (en) * 2005-11-21 2016-08-10 恩特格里公司 The system and method for the position control of the mechanical piston in pump
    US8753097B2 (en) 2005-11-21 2014-06-17 Entegris, Inc. Method and system for high viscosity pump
    CN101583796B (en) 2005-11-21 2012-07-04 恩特格里公司 Multistage pump and method for forming the same
    US8083498B2 (en) 2005-12-02 2011-12-27 Entegris, Inc. System and method for position control of a mechanical piston in a pump
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    Also Published As

    Publication number Publication date
    ATE365868T1 (en) 2007-07-15
    US20050244276A1 (en) 2005-11-03
    DE602004007247D1 (en) 2007-08-09
    DE602004007247T2 (en) 2008-02-28
    EP1602826B1 (en) 2007-06-27

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