EP0636788B1 - Volumetric piston pump driven by an alternating linear movement - Google Patents

Volumetric piston pump driven by an alternating linear movement Download PDF

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Publication number
EP0636788B1
EP0636788B1 EP94401699A EP94401699A EP0636788B1 EP 0636788 B1 EP0636788 B1 EP 0636788B1 EP 94401699 A EP94401699 A EP 94401699A EP 94401699 A EP94401699 A EP 94401699A EP 0636788 B1 EP0636788 B1 EP 0636788B1
Authority
EP
European Patent Office
Prior art keywords
cam
pump
piston
bar
accordance
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
EP94401699A
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German (de)
French (fr)
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EP0636788A1 (en
Inventor
Jean-Pierre Huet
Alain Courtois
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.)
Dubuis SA
Original Assignee
Dubuis SA
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Filing date
Publication date
Priority claimed from FR9309395A external-priority patent/FR2708673A1/en
Application filed by Dubuis SA filed Critical Dubuis SA
Publication of EP0636788A1 publication Critical patent/EP0636788A1/en
Application granted granted Critical
Publication of EP0636788B1 publication Critical patent/EP0636788B1/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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • 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

Description

L'invention concerne une pompe volumétrique à piston animé d'un mouvement linéaire alternatif.The invention relates to a piston positive displacement pump with an alternating linear movement.

L'invention est notamment destinée à constituer une pompe motorisée pour déplacer un fluide vers le corps d'un vérin hydraulique par exemple pour l'actionnement d'outils tels que pinces à sertir, à poinçonner, etc.The invention is in particular intended to constitute a motorized pump for moving a fluid towards the body of a hydraulic cylinder for example for the actuation of tools such as crimping pliers, punching, etc.

Dans ces types d'outils on exerce, en effet, une pression sur un organe de travail, monté mobile dans une tête, au moyen d'un vérin hydraulique actionné par une pompe aspirante et foulante comme par exemple pour le type d'outils décrit dans le FR-A-2 563 291.In these types of tools, pressure is exerted on a working member, mounted movably in a head, by means of a hydraulic cylinder actuated by a suction and treading pump as for example for the type of tools described. in FR-A-2,563,291.

Généralement les pompes utilisées sont à commande manuelle et la pompe décrite dans le document précité est une pompe volumétrique à piston animé d'un mouvement linéaire alternatif.Generally, the pumps used are manually controlled and the pump described in the above-mentioned document is a positive displacement piston pump with a linear reciprocating movement.

Pour assurer ce mouvement alternatif du piston de la pompe, les moyens d'actionnement sont par exemple pourvus de poignées de manoeuvre mais on peut également imaginer des moyens moteurs, par exemple électriques.To ensure this reciprocating movement of the pump piston, the actuating means are for example provided with operating handles but one can also imagine motor means, for example electric.

Notamment dans ce but, l'invention propose un système d'actionnement tout à fait original, pratique et peu encombrant.In particular for this purpose, the invention provides an entirely original, practical and space-saving actuation system.

Par ailleurs on connait des pompes à piston axial comme par exemple celle décrite dans le document WO-A-8902532 dans laquelle le piston est entraîné dans un mouvement linéaire alternatif dans le corps de la pompe par un mécanisme à came qui est mû en rotation selon un axe coaxial à l'axe longitudinal du piston et qui agit sur l'une des extrêmités dudit piston tandis que celui-ci est sollicité en permanence en sens inverse par un moyen élastique.Furthermore, axial piston pumps are known, such as that described in document WO-A-8902532 in which the piston is driven in a reciprocating linear movement in the body of the pump by a cam mechanism which is rotated according to an axis coaxial with the longitudinal axis of the piston and which acts on one of the ends of said piston while the latter is permanently biased in the opposite direction by elastic means.

Une pompe selon l'invention est notamment remarquable en ce qu'elle est pourvue d'un réservoir déformable rempli de fluide, en ce que le mécanisme à came comporte une came double et que l'extrémité du piston tournée vers ladite came s'appuie sur une barrette transversale fixe en rotation mais guidée en translation dans le sens du mouvement du piston, ladite barrette reposant sur la came, de telle sorte que celle-ci, en combinaison avec le moyen élastique, imprime à ladite barrette et au piston, un mouvement rectiligne alternatif qui permet de déplacer le fluide dudit réservoir vers un circuit d'utilisation.A pump according to the invention is notably remarkable in that it is provided with a deformable reservoir filled with fluid, in that the cam mechanism comprises a double cam and that the end of the piston turned towards said cam rests on a transverse bar fixed in rotation but guided in translation in the direction of movement of the piston, said bar resting on the cam, so that the latter, in combination with the elastic means, prints on said bar and on the piston, a reciprocating rectilinear movement which makes it possible to move the fluid from said reservoir to a circuit of use.

Avantageusement, la came est pourvue d'une queue, elle-même entraînée en rotation.Advantageously, the cam is provided with a tail, itself driven in rotation.

Comme déjà dit, l'invention est principalement destinée à concevoir une pompe motorisée et il est simple alors de prévoir un petit moteur électrique alimenté par accumulateurs ou piles rechargeables et/ou par branchement au secteur, ledit moteur étant aménagé pour entraîner la came.As already said, the invention is mainly intended to design a motorized pump and it is then simple to provide a small electric motor powered by accumulators or rechargeable batteries and / or by connection to the mains, said motor being arranged to drive the cam.

Selon un mode de réalisation, la barrette repose directement sur la came qui glisse en tournant sur ladite barrette.According to one embodiment, the bar rests directly on the cam which slides while turning on said bar.

De préférence toutefois, la barrette repose sur la came par l'intermédiaire de galets dont elle est munie, de telle sorte que lesdits galets tournent au contact de ladite came. Dans ce cas par exemple, la barrette comporte deux galets disposés à ses extrémités et qui sont calés par un manchon entretoise.Preferably, however, the bar rests on the cam by means of rollers with which it is provided, so that said rollers rotate in contact with said cam. In this case for example, the bar has two rollers arranged at its ends and which are wedged by a spacer sleeve.

Le réservoir déformable est, par exemple, annulaire et entoure au moins une partie du corps de la pompe dans lequel est aménagé le piston.The deformable reservoir is, for example, annular and surrounds at least part of the pump body in which the piston is arranged.

Selon un mode de réalisation tout à fait intéressant, le réservoir est constitué par une membrane dont la fixation étanche est prévue sur le corps ou une partie solidaire de celui-ci de manière à séparer de façon étanche le circuit hydraulique de la partie mécanique comportant notamment la barrette, la came et l'extrémité correspondante du piston.According to an entirely advantageous embodiment, the reservoir consists of a membrane, the sealed fixing of which is provided on the body or a part integral with the latter so as to seal the hydraulic circuit from the mechanical part, including in particular the bar, the cam and the corresponding end of the piston.

Comme déjà dit, une pompe selon l'invention est notamment destinée à actionner un vérin hydraulique, mais il est clair que toutes les utilisations connues des pompes sont possibles.As already said, a pump according to the invention is in particular intended to actuate a hydraulic cylinder, but it is clear that all the known uses of the pumps are possible.

L'invention sera bien comprise à la lecture de la description qui va suivre et qui se réfère aux dessins annexés dans lesquels:

  • la figure 1 montre en coupe longitudinale simplifiée une pompe selon l'invention prévue pour actionner un vérin hydraulique,
  • la figure 2 est un schéma de principe en coupe et en perspective illustrant la pompe de la figure 1.
The invention will be clearly understood on reading the description which follows and which refers to the appended drawings in which:
  • FIG. 1 shows in simplified longitudinal section a pump according to the invention designed to actuate a hydraulic cylinder,
  • FIG. 2 is a block diagram in section and in perspective illustrating the pump of FIG. 1.

Sur les figures schématiques et simplifiées, on peut voir une pompe munie d'un corps 1 formant un cylindre creux 2 pour un piston 3 de pompe.In the schematic and simplified figures, one can see a pump provided with a body 1 forming a hollow cylinder 2 for a pump piston 3.

Le corps 1 constitue en outre ici, en même temps et d'une seule pièce, un corps 1' pour un vérin hydraulique muni d'un piston 4 aménagé pour coulisser dans ledit corps 1' et qui est sollicité par un ressort 5 travaillant à la compression.The body 1 further constitutes here, at the same time and in one piece, a body 1 'for a hydraulic cylinder provided with a piston 4 arranged to slide in said body 1' and which is biased by a spring 5 working at the compression.

Le piston 3 de la pompe, sous forme d'une aiguille, est monté coulissant longitudinalement dans le cylindre 2. Il comporte d'une seule pièce ou non un pied 6 qui est en contact ou solidaire d'une barrette transversale 7 (par l'intermédiaire ici d'un manchon 7' dont il sera question ci-après) disposée perpendiculairement audit piston 3. Le pied 6 est sollicité par un ressort de compression 8 calé dans le corps 1 tandis que la barrette 7 et fixée en rotation et guidée en translation dans le sens du mouvement du piston 3 au moyen d'encoches oblongues 9a, 9b ménagées dans le corps 1 (ou dans une pièce de guidage disposée autour dudit corps 1) et dans lesquelles se déplacent les extrémités de ladite barrette 7.The piston 3 of the pump, in the form of a needle, is slidably longitudinally mounted in the cylinder 2. It comprises, in one piece or not, a foot 6 which is in contact or integral with a transverse bar 7 (by l 'intermediate here of a sleeve 7' which will be discussed below) arranged perpendicular to said piston 3. The foot 6 is biased by a compression spring 8 wedged in the body 1 while the bar 7 and fixed in rotation and guided in translation in the direction of movement of the piston 3 by means of oblong notches 9a, 9b formed in the body 1 (or in a guide piece disposed around said body 1) and in which the ends of said bar 7 move.

La barrette 7 est en outre sollicitée par une came double 11 pourvue d'une queue 12 montée rotative, par exemple dans un palier à roulement 13. La barrette 7 comporte ici des galets 10 à ses extrémités, qui sont calés par le manchon 7' servant d'entretoise.The bar 7 is further urged by a double cam 11 provided with a tail 12 rotatably mounted, for example in a rolling bearing 13. The bar 7 here comprises rollers 10 at its ends, which are wedged by the sleeve 7 ' serving as a spacer.

En fait le pied 6 est en contact avec le manchon 7' mais comme déjà dit, si le pied 6 peut être solidaire de la barrette 7, le manchon 7' peut également être solidaire ou d'une seule pièce avec ladite barrette 7.In fact the foot 6 is in contact with the sleeve 7 'but as already said, if the foot 6 can be secured to the bar 7, the sleeve 7' can also be integral or in one piece with said bar 7.

Comme le montrent les dessins, la came 11 est montée rotative autour d'un axe 14 coaxial à l'axe longitudinal du piston 3.As shown in the drawings, the cam 11 is rotatably mounted around an axis 14 coaxial with the longitudinal axis of the piston 3.

Le schéma de la figure 2 qui ne reprend que les pièces essentielles ou des parties de celles-ci qui sont nécessaires pour une bonne compréhension, montre bien la forme particulière de la came 11 qui est ici une came de type cloche, dite double pour avoir deux creux et deux bosses diamétralement opposés. On comprend comment en tournant selon la flèche R la came sollicite par l'intermédiaire des galets 10, la barrette 7 et donc le piston 3 à prendre un mouvement rectiligne alternatif selon la double flèche T, c'est-à-dire de va-et-vient, le mouvement de retour étant assuré par le ressort 8 précité. Les galets 10 tournent au contact de la came 11, mais il est clair que selon un autre mode de réalisation ne comportant pas de galets 10, ni de manchon 7', la came 11 glisse sur la barrette 7. La forme de la came est telle que le piston prend deux positions extrêmes lorsque la came effectue un quart de tour, le piston reprenant donc une même position tous les demi-tours, ce qui revient à dire aussi qu'un tour complet (360°) pour la came crée deux mouvements aller-retour pour le piston.The diagram in FIG. 2 which only shows the essential parts or parts thereof which are necessary for a good understanding, clearly shows the particular shape of the cam 11 which is here a bell type cam, said to be double for having two hollows and two diametrically opposite bumps. We understand how by turning along the arrow R the cam urges through the rollers 10, the bar 7 and therefore the piston 3 to take a reciprocating rectilinear movement according to the double arrow T, that is to say back and forth, the return movement being provided by the aforementioned spring 8. The rollers 10 rotate in contact with the cam 11, but it is clear that according to another embodiment comprising no rollers 10 or sleeve 7 ′, the cam 11 slides on the bar 7. The shape of the cam is such that the piston takes two extreme positions when the cam makes a quarter turn, the piston therefore taking up the same position every half turn, which also means that a full revolution (360 °) for the cam creates two return movements for the piston.

Le mouvement alternatif du piston 3 dans le cylindre 2 permet de manière classique d'aspirer, au travers d'au moins un clapet d'aspiration 15, un fluide contenu dans un réservoir 16 déformable formé d'une membrane souple 16' pour le refouler au travers d'un clapet de refoulement 17 dans le corps 1' du vérin hydraulique.The reciprocating movement of the piston 3 in the cylinder 2 conventionally makes it possible to aspirate, through at least one suction valve 15, a fluid contained in a deformable reservoir 16 formed of a flexible membrane 16 ′ to discharge it through a discharge valve 17 in the body 1 'of the hydraulic cylinder.

Le vérin hydraulique (1',4) permet d'actionner tout moyen et en particulier, comme déjà dit, un outil. Il est clair toutefois que si le vérin représenté est un vérin à pousser, on peut bien sûr actionner un vérin à tirer pour un outil correspondant, le fluide étant déplacé vers l'autre extrémité du piston et le ressort étant bien sûr inversé.The hydraulic cylinder (1 ', 4) makes it possible to actuate any means and in particular, as already said, a tool. It is clear however that if the jack shown is a push jack, it is of course possible to actuate a jack to pull for a corresponding tool, the fluid being displaced towards the other end of the piston and the spring being of course reversed.

De manière connue, le dispositif est également pourvu d'un clapet de décharge 18 retenu sur son siège par un ressort 19.In known manner, the device is also provided with a relief valve 18 retained on its seat by a spring 19.

Ce clapet 18 peut être actionné soit éventuellement de manière automatique (ressort taré), soit par la manoeuvre d'un levier 20 en forme de gâchette, de façon à commander la rétraction du piston 4 du vérin en vidant le corps 1' par un circuit de décharge schématisé en 21, le fluide retournant alors vers le réservoir 16.This valve 18 can be actuated either optionally automatically (calibrated spring), or by the operation of a lever 20 in the form of a trigger, so as to control the retraction of the piston 4 of the jack by emptying the body 1 'by a circuit of discharge shown diagrammatically at 21, the fluid then returning to the reservoir 16.

La queue 12 de la came 11 peut être entraînée en rotation par tout moyen et notamment par un moteur électrique schématisé en 22.The tail 12 of the cam 11 can be rotated by any means and in particular by an electric motor shown diagrammatically at 22.

Toutefois, il est clair que le moteur 22 agira généralement par l'intermédiaire d'un système à pignon ou engrenage, de telle sorte que son axe propre peut bien sûr être décalé.However, it is clear that the motor 22 will generally act via a pinion or gear system, so that its own axis can of course be offset.

En outre, selon une disposition intéressante et comme les dessins le montrent, le réservoir déformable est annulaire et entoure au moins une partie du corps 1.In addition, according to an advantageous arrangement and as the drawings show, the deformable reservoir is annular and surrounds at least a part of the body 1.

De préférence et plus particulièrement encore, on peut voir que la membrane souple 16' est fixée de manière étanche sur le corps 1 (ou sur, ou entre des parties fixées ou solidaires dudit corps 1) de telle sorte que la partie hydraulique est séparée de la partie mécanique comportant notamment la barrette 7, la came 11, et l'extrémité correspondante du piston 3. On peut aussi prévoir en cas de besoin des réservoirs additionnels et/ou complémentaires.Preferably and more particularly, it can be seen that the flexible membrane 16 ′ is fixed in leaktight manner to the body 1 (or on, or between fixed or integral parts of said body 1) so that the hydraulic part is separated from the mechanical part comprising in particular the bar 7, the cam 11, and the corresponding end of the piston 3. It is also possible to provide, if necessary, additional and / or complementary tanks.

La description qui précède concerne un mode de réalisation préféré, la came double agissant sur la barrette 7 par l'intermédiaire ou non des galets 10. Toutefois, il est possible aussi, par exemple, d'envisager un mode de réalisation selon lequel l'une des extrémités de la barrette 7 formerait un pivot alors que l'autre extrémité guidée comme précédemment et pourvue ou non d'un galet, serait entraînée dans un mouvement oscillant par une came simple, tout en sollicitant le piston dans un mouvement de va-et-vient.The foregoing description relates to a preferred embodiment, the double cam acting on the bar 7 by means or not of the rollers 10. However, it is also possible, for example, to envisage an embodiment according to which the one of the ends of the bar 7 would form a pivot while the other end guided as previously and whether or not provided with a roller, would be driven in an oscillating movement by a single cam, while urging the piston in a movement of back and forth.

Enfin comme déjà dit, l'invention peut concerner le déplacement d'un fluide pour d'autres applications (élévation d'un fluide, transvasement, ...). En effet, l'invention concerne essentiellement la pompe comme schématisée à la figure 2.Finally, as already said, the invention may relate to the displacement of a fluid for other applications (elevation of a fluid, transfer, ...). In fact, the invention essentially relates to the pump as shown diagrammatically in FIG. 2.

Claims (9)

  1. A volumetric pump (3) with an axial piston driven in a reciprocating linear movement in the body (1) of the pump by a cam mechanism which is driven in rotation about an axis (14) coaxial to the longitudinal axis of the piston and which acts on one of the ends of the said piston while this latter is urged continuously in the opposite direction by elastic means (8), characterised in that it is provided with a deformable reservoir (16) filled with fluid, in that the cam mechanism has a double cam (11) and in that the end of the piston turned towards the said cam rests on a transverse bar (7) fixed in rotation but guided in translation in the direction of the movement of the piston, the said bar resting on the cam (11), in such a way that this latter, in combination with the elastic means (8), communicates to the said bar (7) and to the piston (3), a reciprocating linear movement which allows the fluid from the said reservoir (16) to be displaced towards a load circuit (1',4).
  2. A pump in accordance with claim 1 characterised in that the cam (11) is provided with a tail piece (12) itself driven in rotation.
  3. A pump in accordance with one of claims 1 and 2 characterised in that the cam (11) is driven in rotation by an electric motor (22).
  4. A pump in accordance with one of claims 1 to 3 characterised in that the bar (7) rests directly on the cam (11) which slides, on turning, on the said bar (7).
  5. A pump in accordance with one of claims 1 to 4 characterised in that the bar (7) rests on the cam (11) by means of rollers (10) with which it is equipped, in such a way that the said rollers (10) turn on contact with the said cam (11).
  6. A pump in accordance with claim 5 characterised in that the bar (11) has two rollers (10) arranged at its ends and which are fastened by a spacer sleeve (7').
  7. A pump in accordance with one of claims 1 to 6 characterised in that the deformable reservoir (16) is annular and surrounds at least one part of the body (1) of the pump in which the piston is fitted.
  8. A pump in accordance with claim 7 characterised in that the reservoir is made up from a membrane (16') fixed in a fluidtight manner onto the body (1) or a part solidly attached to the latter in such a way as to separate the hydraulic circuit imperviously from the mechanical part comprising in particular the bar (7), the cam (11) and the corresponding end of the piston (3).
  9. A pump in accordance with one of claims 1 to 8 characterised in that it is intended to displace the fluid from the reservoir (16) towards the body (1') of an hydraulic jack.
EP94401699A 1993-07-30 1994-07-25 Volumetric piston pump driven by an alternating linear movement Expired - Lifetime EP0636788B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9309395A FR2708673A1 (en) 1993-07-30 1993-07-30 Positive-displacement pump having a piston given a reciprocating linear movement
FR9309395 1993-07-30
FR9404788A FR2708674B1 (en) 1993-07-30 1994-04-21 Volumetric piston pump driven by an alternating linear movement.
FR9404788 1994-04-21

Publications (2)

Publication Number Publication Date
EP0636788A1 EP0636788A1 (en) 1995-02-01
EP0636788B1 true EP0636788B1 (en) 1997-03-05

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Application Number Title Priority Date Filing Date
EP94401699A Expired - Lifetime EP0636788B1 (en) 1993-07-30 1994-07-25 Volumetric piston pump driven by an alternating linear movement

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US (1) US5472322A (en)
EP (1) EP0636788B1 (en)
DE (1) DE69401864T2 (en)
ES (1) ES2099553T3 (en)
FR (1) FR2708674B1 (en)

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Also Published As

Publication number Publication date
DE69401864D1 (en) 1997-04-10
ES2099553T3 (en) 1997-05-16
EP0636788A1 (en) 1995-02-01
DE69401864T2 (en) 1997-06-12
FR2708674A1 (en) 1995-02-10
US5472322A (en) 1995-12-05
FR2708674B1 (en) 1996-05-15

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