EP1602826B1 - Pump drive - Google Patents

Pump drive Download PDF

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Publication number
EP1602826B1
EP1602826B1 EP04405346A EP04405346A EP1602826B1 EP 1602826 B1 EP1602826 B1 EP 1602826B1 EP 04405346 A EP04405346 A EP 04405346A EP 04405346 A EP04405346 A EP 04405346A EP 1602826 B1 EP1602826 B1 EP 1602826B1
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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.)
Expired - Lifetime
Application number
EP04405346A
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German (de)
French (fr)
Other versions
EP1602826A1 (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
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Publication date
Application filed by Sonceboz SA, Societe Industrielle de Sonceboz SA filed Critical Sonceboz SA
Priority to EP04405346A priority Critical patent/EP1602826B1/en
Priority to DE602004007247T priority patent/DE602004007247T2/en
Priority to AT04405346T priority patent/ATE365868T1/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
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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
    • 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 or piston pump drive, with a stepper motor.
  • the stepper motor Compared to continuous motor pump drives, the stepper motor has the advantage of allowing, by electronic means, better control of the pumped fluid flow, since the stepper motor allows fine control the rotational speed of the motor, as well as knowing the angular position of the rotor without requiring an external sensor for this purpose.
  • the flow of pumped fluid 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 gear mechanism. cam.
  • the variation of the round-trip frequency of the piston can have a detrimental influence on the pressure variation in the pumped fluid, depending on the harmonic frequencies of the hydraulic system in which the pump is placed, and on the degree of damping of the pulsations or yet other factors.
  • the mechanical adjustment of the amplitude can have disadvantages in terms of the size and complexity of the system, as well as the adjustment possibilities.
  • a diaphragm or piston pump drive comprising a stepper motor, a reducing device and a mechanism for transforming the rotary motion into a translational movement, comprising a rotary member and a piston member for moving a piston or a diaphragm of the pump, the stepper motor comprising a rotor coupled, through the reducing device, to the rotary member, engaging the piston member to drive it in a substantially linear movement of back and forth, characterized in that the stepper motor and the device translation devices are adapted to perform an angular displacement back and forth of the rotary member of the translation mechanism at an angle less than 360 °.
  • the transforming device may include a cam member on the rotatable portion, engaging a complementary cam on the substantially linear moving member.
  • the angular rotation angle of the rotary cam member defines the magnitude of the linear displacement of the piston member.
  • the rotation angle of the cam is electronically adjusted by controlling the stepper motor as well as the control of the speed and accelerations of the motor, without the need for adjustment of mechanical members.
  • the flow rate of the pump can thus be varied not only by changing the piston beat frequency, but also its amplitude by an electronic control of the stepper motor, which makes it possible to optimize the operation of the pump on a large scale. range of values, ie 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 may perform several turns before the change of direction. This makes it possible to obtain a finer control of the angular displacement, in view of the reduction of the displacement through the gearbox, and to better control the ramp of deceleration and acceleration, in particular during the change of direction of rotation.
  • a pump drive 1 comprises a step-by-step electric motor 2 with a wound stator 3 and a rotor 4, a reducing device 5, a device for transforming the rotary motion into a substantially linear motion, and a piston member 7.
  • the gearbox 5 comprises gear wheels 8, 9, 10, 11 effecting a reduction of the transmission ratio between the axis 12 of the rotor and the output shaft 13 of the gearbox.
  • the transformation mechanism 6 comprises a cam element 14 integral with the output shaft 13 of the reducing device and engaging a complementary cam element 15, in the form of a freewheel, mounted on the piston member 7.
  • piston 7 is mounted in a bearing 16 of a body or support 17 of the drive to guide the piston member in a translational movement along an axis A.
  • the cam member 14 is, in this example, under form of a substantially flat disc comprising a opening 18 whose periphery 19, or at least a portion of the periphery, has the function of a cam surface engaging the complementary cam member 15 mounted on the piston member 7 for the displacement of the latter in a reciprocating motion when the rotary cam member 14 is angularly moving back and forth.
  • a first extreme angular position 20a of the cam profile corresponds to an extreme axial position of the piston member and the other extreme angular position 20b of the cam surface corresponds to the extreme axial position of the piston member. 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.
  • Opposite surfaces 20c, 20d of the cam allow pushing and pulling of the piston member without requiring a recoil spring, which reduces frictional wear and decreases the number of components. Opposite cam surfaces also allow for high acceleration and deceleration.
  • the flow of the pump can be varied, by acting on the number of steps made by the rotor of the stepper motor before the change of direction, by an electronic control counting the number of steps and controlling the deceleration, the stop and acceleration in the other direction of the rotor of the stepper motor. It is also possible to vary the pumped flow rate by varying the speed of movement of the piston member by electronically controlling the pitch frequency of the stepper motor.
  • a speed profile of the asymmetrical back and forth movement by controlling, by means of the electronic control, the movement in a direction of rotation with a frequency of step different from the frequency in the other direction of rotation.
  • An asymmetric displacement profile can be very advantageous to optimize the suction and the expulsion of the liquid by the piston according to the characteristics of the pump and the hydraulic system, for example, to avoid cavitation during suction or shocks or vibrations during expulsion.
  • stepper motor not only has the advantage of allowing a very reliable and precise electronic control of the amplitude and the frequency according to a desired speed profile, but also of generating a high torque to relatively low rotational speeds.
  • the electronic engine control can be done through a low noise motor driver in order to avoid the known resonances of the stepper motors as well as to optimize the efficiency of the engine. . It can therefore reduce its heating by varying the current according to the operating state, for example by cutting off the current, reducing the current during the suction cycle of the pump at low pressure and providing a high or nominal current during the expulsion cycle of the pump in a situation of high hydraulic pressure.
  • the reduction device makes it possible to reduce the bulk of the engine while improving the acceleration and deceleration ramps of the rotor, as well as the positioning accuracy of the cam member, and consequently the amplitude and the frequency of displacement of the motor. the piston member.
  • the reducing device also makes it possible to absorb shocks, especially during changes of direction.
  • the output shaft 13 of the reducing device is provided with a bearing in the form of a needle bearing 21 with a small bulk.
  • the complementary cam member 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.
  • the complementary cam element 15 has a diameter slightly smaller than the radial distance separating the surfaces of the opposing cams 20c, 20d, this small clearance making it possible to avoid friction of the complementary cam element against the surface cam opposite to the engaging cam surface.
  • a cam system it is also possible to transform the rotary movement at the outlet of the reducing device by a rod system, that is to say where the piston member is interconnected to a solid disc of the output shaft of the reducing device, by a hinge pivotally coupled to the disk and the piston member.
  • the piston member need not perform a pure translational movement, as long as there is a displacement component in a direction perpendicular to the general plane of the diaphragm to vary the volume of the 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 entraînement de pompe à membrane ou à piston, avec un moteur pas-à-pas.The present invention relates to a diaphragm or piston pump drive, with a stepper motor.

Des entraînements 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 entraîné 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 the US patent US 4,326,837 . The publication DE 196 23,537 discloses a diaphragm pump comprising a piston reciprocating by means of a cam system driven by a stepper motor through gear wheels, which motor is controlled by a microprocessor.

Par rapport aux entraînements 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 connaître 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 of the pumped fluid flow, since the stepper motor allows fine control the rotational speed of the motor, as well as knowing 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 stepper motor pumps, the flow of pumped fluid 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 gear mechanism. cam. The variation of the round-trip frequency of the piston can have a detrimental influence on the pressure variation in the pumped fluid, depending on the harmonic frequencies of the hydraulic system in which the pump is placed, and on the degree of damping of the pulsations or yet 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 to vary the flow rate pumped in diaphragm or piston pumps is the adjustment of the displacement amplitude of the piston by mechanical means, as described in the patent application. European 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 in terms of the size and complexity of the system, as well as the adjustment possibilities.

Un but de l'invention est de fournir un entraînement de pompe à piston ou à membrane pouvant être réglé avec précision sur une plage de fonctionnement étendue.It is an object of the invention to provide a piston or diaphragm pump drive which can be accurately adjusted over an extended operating range.

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

Il est avantageux de fournir un entraînement 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 or diaphragm pump drive that is highly accurate and responsive to allow the flow rate of fluid to be changed very quickly.

II est avantageux de fournir un entraînement de pompe à piston ou à membrane versatile et peu encombrante.It is advantageous to provide a versatile and space saving piston or diaphragm pump drive.

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

Dans la présente invention, un entraînement 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'entraîner 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 or piston pump drive comprising a stepper motor, a reducing device and a mechanism for transforming the rotary motion into a translational movement, comprising a rotary member and a piston member for moving a piston or a diaphragm of the pump, the stepper motor comprising a rotor coupled, through the reducing device, to the rotary member, engaging the piston member to drive it in a substantially linear movement of back and forth, characterized in that the stepper motor and the device translation devices are adapted to perform 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 transforming device may include a cam member on the rotatable portion, engaging a complementary cam on the substantially linear moving member.

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 member defines the magnitude of the linear displacement of the piston member. Advantageously, the rotation angle of the cam is electronically adjusted by controlling the stepper motor as well as the control of the speed and accelerations of the motor, without the need for adjustment of mechanical members. The flow rate of the pump can thus be varied not only by changing the piston beat frequency, but also its amplitude by an electronic control of the stepper motor, which makes it possible to optimize the operation of the pump on a large scale. range of values, ie 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 linkage system, that is to say that the linear displacement member is fixed by means of a pivoting joint on the rotating part to the output of the reducer.

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 may be in the form of gear wheels, implies that the motor rotor may perform several turns before the change of direction. This makes it possible to obtain a finer control of the angular displacement, in view of the reduction of the displacement through the gearbox, and to better control the ramp of deceleration and acceleration, in particular during the change of 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 entraînement de pompe à piston ou à membrane selon l'invention;
  • la Fig. 2a est une vue en plan de l'entraînement 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'entraînement 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 entraînement 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 step-by-step electric motor 2 with a wound stator 3 and a rotor 4, a reducing device 5, a device for transforming the rotary motion into a substantially linear motion, 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'entraînement 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 effecting a reduction of the transmission ratio between the axis 12 of the rotor and the output shaft 13 of the gearbox. The transformation mechanism 6 comprises a cam element 14 integral with the output shaft 13 of the reducing device and engaging a complementary cam element 15, in the form of a freewheel, mounted on the piston member 7. piston 7 is mounted in a bearing 16 of a body or support 17 of the drive to guide the piston member in a translational movement along an axis A. The cam member 14 is, in this example, under form of a substantially flat disc comprising a opening 18 whose periphery 19, or at least a portion of the periphery, has the function of a cam surface engaging the complementary cam member 15 mounted on the piston member 7 for the displacement of the latter in a reciprocating motion when the rotary cam member 14 is angularly moving back and forth. The profile of the cam surface 20, defined by the angular position of each point of the surface and its radial distance with respect to the axis of rotation of the member 14, defines the axial position 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 piston member and the other extreme angular position 20b of the cam surface corresponds to the extreme axial position of the piston member. 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. Opposite surfaces 20c, 20d of the cam allow pushing and pulling of the piston member without requiring a recoil spring, which reduces frictional wear and decreases the number of components. Opposite cam surfaces also allow for high acceleration and deceleration.

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 made by the rotor of the stepper motor before the change of direction, by an electronic control counting the number of steps and controlling the deceleration, the stop and acceleration in the other direction of the rotor of the stepper motor. It is also possible to vary the pumped flow rate by varying the speed of movement of the piston member by electronically controlling the pitch frequency of the stepper motor.

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 of the asymmetrical back and forth movement by controlling, by means of the electronic control, the movement in a direction of rotation with a frequency of step different from the frequency in the other direction of rotation. An asymmetric displacement profile can be very advantageous to optimize the suction and the expulsion of the liquid by the piston according to the characteristics of the pump and the hydraulic system, for example, to avoid cavitation during suction or shocks or vibrations 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 allowing a very reliable and precise electronic control of the amplitude and the frequency according to a desired speed profile, but also of generating a high torque to 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 in order to avoid the known resonances of the stepper motors as well as to optimize the efficiency of the engine. . It can therefore reduce its heating by varying the current according to the operating state, for example by cutting off the current, reducing the current during the suction cycle of the pump at low pressure and providing a high or nominal current during the expulsion cycle 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 reduction device makes it possible to reduce the bulk of the engine while improving the acceleration and deceleration ramps of the rotor, as well as the positioning accuracy of the cam member, and consequently the amplitude and the frequency of displacement of the motor. 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, especially during changes of direction. In order to be able to withstand high radial loads, the output shaft 13 of the reducing device is provided with a bearing in the form of a needle bearing 21 with a small bulk. The complementary cam member 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 complementary cam element 15 has a diameter slightly smaller than the radial distance separating the surfaces of the opposing cams 20c, 20d, this small clearance making it possible to avoid friction of the complementary cam element against the surface cam 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 movement at the outlet of the reducing device by a rod system, that is to say where the piston member is interconnected to a solid disc of the output shaft of the reducing device, by a hinge pivotally coupled to the disk and the piston member. It should be emphasized that the piston member need not perform a pure translational movement, as long as there is a displacement component in a direction perpendicular to the general plane of the diaphragm to vary the volume of the pump. .

Claims (9)

  1. Membrane or piston pump drive comprising a stepping motor (2) and a conversion mechanism (6) to convert rotational movement into translational movement, comprising a rotating member (4) and a piston member (7) intended to move a piston or membrane of the pump, the stepping motor comprising a rotor coupled to the rotating member, engaging the piston member (7) so as to drive it in an essentially linear back-and-forth movement, characterized in that the stepping motor and the translation device are adapted to perform an angular return movement of the rotating member of the translation mechanism at an angle of less than 360°.
  2. Pump drive according to claim 1, characterized in that the rotating member of the translation mechanism comprises a cam surface engaging a complementary cam element fixed to the piston member.
  3. Pump drive according to the preceding claim, characterized in that the cam surface is formed on the periphery of an opening made in an element in the form of a disc secured to the output shaft of the step-down gear device.
  4. Pump drive according to claim 2 or 3, characterized in that the cam surface (20) comprises opposite cam surfaces (20c, 20d) to conduct pushing and drawing of the piston member without any recoil spring.
  5. Pump drive according to any of the preceding claims, characterized in that the rotor of the stepping motor is coupled to the rotational member engaging the piston member via a step-down gear device (5).
  6. Pump drive according to the preceding claim, characterized in that the step-down gear device comprises a pinion on the output shaft of the rotor of the stepping motor, coupled via gear wheels to an output shaft of the step-down gear device secured to the rotating member of the translation mechanism.
  7. Pump drive according to any of the preceding claims, characterized in that it comprises an electronic command able to control the rotational amplitude of the rotor in one direction and in the other, and the step frequency, so as to generate an asymmetric speed profile in which the linear travel speed of the piston member in a suction direction of the pumped fluid is different to the travel speed of the member in the other direction.
  8. Method for commanding a pump drive according to any of the preceding claims, characterized in that the fluid flow rate of the pump is varied by modifying the amplitude of angular travel and/or the step frequency of the rotor in one direction and in the other.
  9. Method according to the preceding claim, characterized in that the speed of angular travel of the rotor in one direction is regulated so that it is different to the speed in the other direction, in order to obtain an asymmetric speed profile for fluid suction and expelling.
EP04405346A 2004-04-06 2004-06-04 Pump drive Expired - Lifetime EP1602826B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP04405346A EP1602826B1 (en) 2004-06-04 2004-06-04 Pump drive
DE602004007247T DE602004007247T2 (en) 2004-06-04 2004-06-04 pump drive
AT04405346T ATE365868T1 (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 EP1602826A1 (en) 2005-12-07
EP1602826B1 true 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

Country Status (4)

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

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US8172546B2 (en) 1998-11-23 2012-05-08 Entegris, Inc. System and method for correcting for pressure variations using a motor
US8292598B2 (en) 2004-11-23 2012-10-23 Entegris, Inc. System and method for a variable home position dispense system
WO2007061956A2 (en) 2005-11-21 2007-05-31 Entegris, Inc. System and method for a pump with reduced form factor
EP1954946B1 (en) * 2005-11-21 2014-11-05 Entegris, Inc. System and method for position control of a mechanical piston in a pump
US8753097B2 (en) 2005-11-21 2014-06-17 Entegris, Inc. Method and system for high viscosity pump
US8083498B2 (en) 2005-12-02 2011-12-27 Entegris, Inc. System and method for position control of a mechanical piston in a pump
WO2007067358A2 (en) 2005-12-02 2007-06-14 Entegris, Inc. System and method for pressure compensation in a pump
US7878765B2 (en) 2005-12-02 2011-02-01 Entegris, Inc. System and method for monitoring operation of a pump
TWI402423B (en) 2006-02-28 2013-07-21 Entegris Inc System and method for operation of a pump
US8097990B2 (en) * 2010-02-18 2012-01-17 Oscilla Power Inc. Electrical generator that utilizes rotational to linear motion conversion
TWI678303B (en) * 2018-09-26 2019-12-01 宏碁股份有限公司 Brake system
US11698059B2 (en) * 2018-12-29 2023-07-11 Biosense Webster (Israel) Ltd. Disposable dual-action reciprocating pump assembly
CN113562385B (en) * 2020-04-29 2023-06-13 亚泰半导体设备股份有限公司 Liquid pumping system

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US4566868A (en) * 1980-09-17 1986-01-28 Geotechnical Digital Systems Limited Pressure source
US4643649A (en) * 1984-07-20 1987-02-17 The Perkin-Elmer Corporation Digital control for rapid refill of a liquid chromatograph pump
FR2624919B1 (en) * 1987-12-17 1990-04-27 Milton Roy Dosapro DEVICE FOR ADJUSTING THE FLOW OF AN ALTERNATIVE DOSING PUMP
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DE19849785C1 (en) * 1998-10-28 2000-03-16 Ott Kg Lewa Method and device for adjusting feed in oscillating positive-displacement pumps driven by means of driving motor using a rotating shaft and a driving mechanism such as crank gearing, gives versatility in operation
WO2000030244A1 (en) * 1998-11-12 2000-05-25 Matsushita Electric Industrial Co., Ltd. Stepping motor control device
US6742441B1 (en) * 2002-12-05 2004-06-01 Halliburton Energy Services, Inc. Continuously variable displacement pump with predefined unswept volume

Also Published As

Publication number Publication date
DE602004007247T2 (en) 2008-02-28
US20050244276A1 (en) 2005-11-03
DE602004007247D1 (en) 2007-08-09
EP1602826A1 (en) 2005-12-07
ATE365868T1 (en) 2007-07-15

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