EP0040161A1 - Wobble plate of an axial-type piston pump - Google Patents

Wobble plate of an axial-type piston pump Download PDF

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Publication number
EP0040161A1
EP0040161A1 EP81400765A EP81400765A EP0040161A1 EP 0040161 A1 EP0040161 A1 EP 0040161A1 EP 81400765 A EP81400765 A EP 81400765A EP 81400765 A EP81400765 A EP 81400765A EP 0040161 A1 EP0040161 A1 EP 0040161A1
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EP
European Patent Office
Prior art keywords
axis
plate
pistons
cylinder
pump 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
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EP81400765A
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German (de)
French (fr)
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EP0040161B1 (en
Inventor
François Couillard
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Individual
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Individual
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Priority claimed from FR8010916A external-priority patent/FR2484555B1/en
Priority claimed from FR8106018A external-priority patent/FR2502702B1/en
Application filed by Individual filed Critical Individual
Priority to AT81400765T priority Critical patent/ATE10301T1/en
Publication of EP0040161A1 publication Critical patent/EP0040161A1/en
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Publication of EP0040161B1 publication Critical patent/EP0040161B1/en
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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
    • 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
    • F04B1/26—Control
    • F04B1/28—Control of machines or pumps with stationary cylinders
    • F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate

Definitions

  • the plate is tiltable about an axis orthogonal to said axis of revolution carried laterally by a support for driving the plate in rotation.
  • the invention relates to this type of pump and relates to an improvement in construction to meet a particular requirement imposed by the use of these pumps in the field of very precise metering at relatively low flow rate less than the deciliter and which can reach a few microliters per minute. This requirement is particularly severe in liquid chromatography. It is for reasons of precision to keep each piston of the pump in an invariable delivery neutral position regardless of the displacement, so the stroke of the pistons.
  • the invention relates to a reciprocating piston pump of the fixed barrel type comprising a plurality of parallel pistons whose axes are regularly distributed over a cylinder and which are held in abutment by their end external to the barrel on a plate. rotating around the axis of said cylinder and capable of being inclined around a shaft perpendicular to the axis of the said cylinder.
  • the surface portion of the plate on which said ends of the pistons rest has in a plane passing through the axis of said cylinder and perpendicular to said articulation shaft of the plate a circular trace centered on the axis of said articulation shaft.
  • Said surface portion may be toroidal and defined by the surface generated by the aforementioned trace during a movement of revolution around the axis of said cylinder, and the contact between the latter and the piston ends is practically punctual.
  • said surface portion is reduced to a line, the trace of which in the above-mentioned plane consists of the trace of the axis of the above-mentioned articulation shaft.
  • the inclination of the plate can be adjusted by means of a movable fulcrum along the axis of said cylinder which cooperates with a face of the plate opposite to that provided with the above-mentioned surface portion, while the contact part this face with said point has a cam profile allowing a variation of the piston stroke proportional to the displacement of the point along said axis.
  • It can also be adjusted by means of a circular track centered on the axis of revolution and cooperating with a part of the plate diametrically opposite to said axis of articulation.
  • a pump body 1 fixed longitudinal axis around which are re, regularly distributed three, four, or more, pistons 2 whose axes 2a are located on a cylinder axis la.
  • pistons 2 are slidably mounted in the body or barrel 1 and their end 2b cooperates with a chamber 3 to vary the volume.
  • springs 2c are kept applied by springs 2c on a plate 4 which is articulated at 5 around a shaft orthogonal to the axis la and carried by a rotating support 10 around the axis la.
  • a member 6 - for example a micrometric threaded rod - serves as an adjustable stop for the plate 4 and its position along 1, the axis determines the inclination of the plate and thereby the stroke from pistons maneuvered by the inclined plate and the displacement of the pump.
  • FIG. 3 One of the solutions to this problem which the invention proposes is illustrated by FIG. 3 in which we find some of the elements already described with the same references.
  • the upper face 4a of the plate has a surface portion 7 on which the pistons 2 bear.
  • This surface portion 7 is such that, in a plane containing the axis la and perpendicular to it axis 5 - that is to say the plane of the figure - it has a circular trace 7a constituted by an arc of a circle centered on the axis 5.
  • a preferred form of the surface 7 will be constituted by the surface generated by the rotation of the trace 7a around the axis la.
  • the surface 7 will then be toroidal (as in the figure).
  • the pistons 2 have an end surface 2d on the side of the convex plate (here spherical) such that the contact of these pistons with the surface 7 is practically punctual.
  • This surface 2d can affect the profile of a cam in the plane of the figure - and more generally in each radial plane passing through the axes 2a - which would allow - taking into account the geometry of the movable elements relative to each other, to make the variation of the piston stroke by inclination of the proportional plate - linear function - of the movement of the member 6. In this case, care will be taken to stop the pistons in rotation around their axis relative to the pump body.
  • Such a profile of the surfaces 2d brings an improvement to the pump affecting in a high order the precision of the adjustment, taking into account that the corrections which it brings are minimal.
  • the contact end of the member 6 with the plate 4 or the contact surface 4b of this plate with the said member can be produced in suitable cam profile for the same purpose. It will be noted in this case that the conformation of the member 6 will be of revolution and that the cutting of the face 4b will be carried out beyond the shaft 5 relative to the axis la if the plate is inclined in the direction A .
  • a part 4c of the plate 4 is shown cooperating with a circular track 9 extending in a plane perpendicular to the axis la and adjustable along this axis.
  • These two means replace the central member 6 to adjust the inclination of the plate 4.
  • the bearing surface of said part 4c can also be cut on the cam surface to make the relationship between the movement linear. of track 9 and the variation of the subsequent piston stroke.
  • the position of the axis 5a of the shaft 5 can be indifferent at least in theory (apart from its orientation) and is shown arbitrarily in the figure. It may however be advantageous to provide it directly above the axes 2a.
  • the arrangement according to the invention tion makes it possible to choose the position of this axis to the best of technological possibilities.
  • the plate 4 comprises, by way of surface portion, a line 11, the trace of which in the above-mentioned perpendicular plane consists of the trace of the axis 5a itself.
  • the axis 5a is contained in the plane of the plate 4 and is tangent to the line 11 which is the line of the points of contact of the pistons on the plate.
  • the desired result is obtained only to an approximation due to the material thickness of the parts used, an approximation which can in many cases be sufficient.
  • the invention finds an interesting application in the field of precision pumps.

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

Abstract

1. Reciprocating piston pump of the type incorporating a fixed barrel piston-chamber 1 comprising a plurality of parallel pistons 2 whose axes 2a are regularly distributed over a cylinder and which are maintained in abutment by their end 2d outside the barrel on a plate 4 capable of being inclined about a shaft 5 perpendicular to the axis 1a of said cylinder, characterized in that the plate 4 may rotate about the axis of said cylinder and the surface portion 7 of the plate 4 on which said ends 2d of the pistons bear possesses in a plane passing through the axis of sais cylinder 1a and perpendicular to said pivot shaft 5 of the plate 4 a circular projection 7a centered on the axis 5a of the pivot shaft 5 and forming a stop for said ends of the pistons.

Description

Il est connu, dans le domaine des pompes, d'animer d'un mouvement alternatif des pistons montés à coulissement dans un corps de pompe appelé barillet et régulièrement répartis dans ce corps de pompe autour d'un axe parallèle à l'axe de chacun des pistons, au moyen d'un plateau inclinable sur lequel prennent appui les pistons, en faisant tourner le plateau par rapport au barillet ou, inversement, autour de l'axe longitudinal susdit.It is known in the field of pumps to animate reciprocating pistons mounted to slide in a pump body called a barrel and regularly distributed in this pump body around an axis parallel to the axis of each. pistons, by means of a tilting plate on which the pistons bear, by rotating the plate relative to the barrel or, conversely, around the said longitudinal axis.

Dans le cas notamment d'un plateau tournant et d'un barillet fixe, le plateau est inclinable autour d'un axe orthogonal audit axe de révolution porté latéralement par un support d'entraînement en rotation du plateau.In the case in particular of a rotating plate and a fixed barrel, the plate is tiltable about an axis orthogonal to said axis of revolution carried laterally by a support for driving the plate in rotation.

L'invention est relative à ce type de pompe et concerne un perfectionnement de construction pour répondre à une exigence particulière qu'impose l'usage de ces pompes dans le domaine du dosage très précis à relativement faible débit inférieur au décilitre et pouvant atteindre quelques microlitres par minute. Cette exigence est particulièrement sévère en chromatographie en phase liquide. Il s'agit pour des raisons de précision de conserver à chacun des pistons de la pompe une position de point mort de refoulement invariable quelle que soit la cylindrée, donc la course des pistons.The invention relates to this type of pump and relates to an improvement in construction to meet a particular requirement imposed by the use of these pumps in the field of very precise metering at relatively low flow rate less than the deciliter and which can reach a few microliters per minute. This requirement is particularly severe in liquid chromatography. It is for reasons of precision to keep each piston of the pump in an invariable delivery neutral position regardless of the displacement, so the stroke of the pistons.

A cet effet donc, l'invention concerne.une pompe à pistons alternatifs du type à barillet fixe comportant une pluralité de pistons parallèles dont les axes sont régulièrement répartis sur un cylindre et qui sont maintenus en appui par leur extrémité extérieure au barillet sur un plateau tournant autour de l'axe dudit cylindre et susceptible d'être incliné autour d'un arbre perpendiculaire à l'axe du cylindre susdit.To this end therefore, the invention relates to a reciprocating piston pump of the fixed barrel type comprising a plurality of parallel pistons whose axes are regularly distributed over a cylinder and which are held in abutment by their end external to the barrel on a plate. rotating around the axis of said cylinder and capable of being inclined around a shaft perpendicular to the axis of the said cylinder.

Selon l'une des caractéristiques principales de l'invention, la portion de surface du plateau sur laquelle s'appuient lesdites extrémités des pistons possède dans un plan passant par l'axe dudit cylindre et perpendiculaire audit arbre d'articulation du plateau une trace circulaire centrée sur l'axe dudit arbre d'articulation. Ladite portion de surface peut être torique et définie par la surface engendrée par la trace susdite lors d'un mouvement de révolution autour de l'axe dudit cylindre, et le contact entre cette dernière et les extrémités de piston est pratiquement ponctuel.According to one of the main characteristics of the invention, the surface portion of the plate on which said ends of the pistons rest has in a plane passing through the axis of said cylinder and perpendicular to said articulation shaft of the plate a circular trace centered on the axis of said articulation shaft. Said surface portion may be toroidal and defined by the surface generated by the aforementioned trace during a movement of revolution around the axis of said cylinder, and the contact between the latter and the piston ends is practically punctual.

Dans une autre réalisation, ladite portion de surface est réduite à une ligne dont la trace dans le plan susdit est constituée par la trace de l'axe de l'arbre d'articulation susdit.In another embodiment, said surface portion is reduced to a line, the trace of which in the above-mentioned plane consists of the trace of the axis of the above-mentioned articulation shaft.

L'inclinaison du plateau peut être réglée au moyen d'un point d'appui mobile le long de l'axe dudit cylindre qui coopère avec une face du plateau opposée à celle pourvue de la portion de surface susdite, tandis que la partie de contact de cette face avec ledit point présente un profil de came permettant une variation de la course des pistons proportionnelle au déplacement du point le long dudit axe.The inclination of the plate can be adjusted by means of a movable fulcrum along the axis of said cylinder which cooperates with a face of the plate opposite to that provided with the above-mentioned surface portion, while the contact part this face with said point has a cam profile allowing a variation of the piston stroke proportional to the displacement of the point along said axis.

Elle peut également être réglée au moyen d'une piste circulaire centrée sur l'axe de révolution et coopérant avec une partie du plateau diamétralement opposée audit axe d'articulation.It can also be adjusted by means of a circular track centered on the axis of revolution and cooperating with a part of the plate diametrically opposite to said axis of articulation.

L'invention sera mieux comprise au cours de la description donnée ci-après à titre d'exemple purement indicatif et non limitatif qui permettra d'en dégager les avantages et les caractéristiques secondaires.The invention will be better understood during the description given below by way of purely indicative and nonlimiting example which will make it possible to identify the advantages and the secondary characteristics thereof.

Il sera fait référence aux dessins annexés dans lesquels :

  • - la figure 1 illustre la construction générale d'une pompe connue ;
  • - les figures 2A et 2B montrent par un détail de construction les imperfections de fonctionnement d'une pompe du type de la figure 1 ;
  • - la figure 3 illustre un premier mode de réalisation du perfectionnement selon l'invention; et
  • - les figures 4A et 4B illustrent un second mode de réalisation du perfectionnement selon l'invention.
Reference will be made to the appended drawings in which:
  • - Figure 1 illustrates the general construction of a known pump;
  • - Figures 2A and 2B show a construction detail of the operating imperfections of a pump of the type of Figure 1;
  • - Figure 3 illustrates a first embodiment of the improvement according to the invention; and
  • - Figures 4A and 4B illustrate a second embodiment of the improvement according to the invention.

En se reportant au schéma de la figure 1, on voit un corps de pompe 1 fixe d'axe longitudinal la autour duquel sont ré, gulièrement répartis trois, quatre,ou plus, pistons 2 dont les axes 2a sont situés sur un cylindre d'axe la. Ces pistons sont montés coulissants dans le corps ou barillet 1 et leur extrémité 2b coopère avec une chambre 3 pour en faire varier le volume. Ces pistons sont maintenus appliqués par des ressorts 2c sur un plateau 4 qui est articulé en 5 autour d'un arbre orthogonal à l'axe la et porté par un support tournant 10 autour de l'axe la. Un organe 6 - par exemple une tige filetée micrométrique - sert de butée réglable au plateau 4 et sa position le long de 1,'axe la détermine l'inclinaison du plateau et par là la course dès pistons manoeuvrés par le plateau incliné et la cylindrée de la pompe.Referring to the diagram of Figure 1, we see a pump body 1 fixed longitudinal axis around which are re, regularly distributed three, four, or more, pistons 2 whose axes 2a are located on a cylinder axis la. These pistons are slidably mounted in the body or barrel 1 and their end 2b cooperates with a chamber 3 to vary the volume. These pistons are kept applied by springs 2c on a plate 4 which is articulated at 5 around a shaft orthogonal to the axis la and carried by a rotating support 10 around the axis la. A member 6 - for example a micrometric threaded rod - serves as an adjustable stop for the plate 4 and its position along 1, the axis determines the inclination of the plate and thereby the stroke from pistons maneuvered by the inclined plate and the displacement of the pump.

Lorsque le plateau 4 est parfaitement perpendiculaire à l'axe la, sa rotation ne provoque aucun mouvement des pistons qui restent à leur point mort haut tel qu'il est représenté sur la figure 2B. On peut d'ailleurs régler ce point mort de refoulement de manière que les pistons ne pénètrent pas dans la chambre 3.When the plate 4 is perfectly perpendicular to the axis la, its rotation does not cause any movement of the pistons which remain at their top dead center as shown in FIG. 2B. It is also possible to adjust this neutral point of delivery so that the pistons do not enter chamber 3.

Mais on voit sur la figure 2A que, si l'on incline le plateau 4 autour de l'arbre 5,. on modifie la position du point mort haut (de refoulement) des pistons d'une valeur e fonction de l'angle d'inclinaison. Ces dispositions sont préjudiciables dans certaines applications des pompes pour des dosages extrêmement précis.But we see in Figure 2A that, if we tilt the plate 4 around the shaft 5 ,. the position of the top dead center (of delivery) of the pistons is modified by a value e as a function of the angle of inclination. These provisions are detrimental in certain applications of pumps for extremely precise dosages.

L'une des solutions à ce problème que propose l'invention est illustrée par la figure 3 sur laquelle on retrouve certains des éléments déjà décrits avec les mêmes références.One of the solutions to this problem which the invention proposes is illustrated by FIG. 3 in which we find some of the elements already described with the same references.

On notera en regard de cette figure que la face supérieure 4a du plateau possède une portion de surface 7 sur laquelle prennent appui les pistons 2. Cette portion de surface 7 est telle que, dans un plan contenant l'axe la et perpendiculaire à l'axe 5 - c'est-à-dire le plan de figure - elle possède une trace 7a circulaire constituée par un arc de cercle centré sur l'axe 5. Ainsi, quelle que soit l'inclinaison du plateau 4 autour de l'axe 5, le point de contact 8 des pistons avec le plateau dans le plan susdit est fixe. Il est donc situé à une distance fixe du barillet 1. Si l'inclinaison du plateau est réalisée dans le sens de la flèche A, le lieu du point 8 lors de la rotation du plateau est un cercle contenu dans un plan perpendiculaire à l'axe la qui définit le point mort de refoulement de tous les pistons. On voit qu'ainsi tous les pistons ont un point mort de refoulement invariable et indépendant de l'inclinaison du plateau. Ce résultat sera obtenu si, par ailleurs, la surface 7 ne présente pas de pente ascendante à partir de la face 4a du plateau le long de la ligne de contact des pistons lorsque ce plateau est perpendiculaire à l'axe la.It will be noted with regard to this figure that the upper face 4a of the plate has a surface portion 7 on which the pistons 2 bear. This surface portion 7 is such that, in a plane containing the axis la and perpendicular to it axis 5 - that is to say the plane of the figure - it has a circular trace 7a constituted by an arc of a circle centered on the axis 5. Thus, whatever the inclination of the plate 4 around the axis 5, the point of contact 8 of the pistons with the plate in the above-mentioned plane is fixed. It is therefore located at a fixed distance from the barrel 1. If the inclination of the plate is made in the direction of arrow A, the place of point 8 during the rotation of the plate is a circle contained in a plane perpendicular to the axis la which defines the neutral point of delivery of all the pistons. We see that thus all the pistons have a neutral point of unchanging discharge and independent of the inclination of the plate. This result will be obtained if, moreover, the surface 7 does not have an ascending slope from the face 4a of the plate along the contact line of the pistons when this plate is perpendicular to the axis la.

Une forme préférée de la surface 7 sera constituée par la surface engendrée par la rotation de la trace 7a autour de l'axe la. La surface 7 sera alors torique (comme sur la figure).A preferred form of the surface 7 will be constituted by the surface generated by the rotation of the trace 7a around the axis la. The surface 7 will then be toroidal (as in the figure).

On aura noté que les pistons 2 présentent une surface d'extrémité 2d du côté du plateau convexe (ici sphérique) telle que le contact de ces pistons avec la surface 7 soit pratiquement ponctuel. Cette surface 2d peut affecter le profil d'une came dans le plan de la figure - et plus généralement dans chaque plan radial passant par les axes 2a - qui permettrait,-compte tenu de la géométrie des éléments mobiles les uns par rapport aux autres, de rendre la variation de la course des pistons par inclinaison du plateau proportionnelle - fonction linéaire - du déplacement de l'organe 6. On prendra soin dans ce cas d'arrêter les pistons en rotation autour de leur axe par rapport au corps de pompe. Un tel profil des surfaces 2d apporte un perfectionnement à la pompe affectant dans un ordre élevé la précision du réglage, compte tenu du fait que les corrections qu'il apporte sont minimes.It will be noted that the pistons 2 have an end surface 2d on the side of the convex plate (here spherical) such that the contact of these pistons with the surface 7 is practically punctual. This surface 2d can affect the profile of a cam in the plane of the figure - and more generally in each radial plane passing through the axes 2a - which would allow - taking into account the geometry of the movable elements relative to each other, to make the variation of the piston stroke by inclination of the proportional plate - linear function - of the movement of the member 6. In this case, care will be taken to stop the pistons in rotation around their axis relative to the pump body. Such a profile of the surfaces 2d brings an improvement to the pump affecting in a high order the precision of the adjustment, taking into account that the corrections which it brings are minimal.

De la même manière, on pourra réaliser en profil de came adéquat l'extrémité de contact de l'organe 6 avec le plateau 4 ou la surface 4b de contact de ce plateau avec ledit organe dans le même but. On notera dans ce cas que la conformation de l'organe 6 sera de révolution et que le taillage de la face 4b sera réalisé au-delà de l'arbre 5 par rapport à l'axe la si le plateau est incliné dans le sens A.Likewise, the contact end of the member 6 with the plate 4 or the contact surface 4b of this plate with the said member can be produced in suitable cam profile for the same purpose. It will be noted in this case that the conformation of the member 6 will be of revolution and that the cutting of the face 4b will be carried out beyond the shaft 5 relative to the axis la if the plate is inclined in the direction A .

Enfin, sur cette figure 3, on a représenté une partie 4c du plateau 4 coopérant avec une piste circulaire 9 s'étendant.dans un plan perpendiculaire à l'axe la et réglable le long de cet axe. Ces deux moyens viennent en substitution de l'organe central 6 pour assurer le réglage de l'inclinaison du plateau 4. La surface d'appui de ladite partie 4c pourra elle aussi être taillée en surface de came pour rendre linéaire la relation entre le mouvement de la piste 9 et la variation de la course des pistons subséquente.Finally, in this FIG. 3, a part 4c of the plate 4 is shown cooperating with a circular track 9 extending in a plane perpendicular to the axis la and adjustable along this axis. These two means replace the central member 6 to adjust the inclination of the plate 4. The bearing surface of said part 4c can also be cut on the cam surface to make the relationship between the movement linear. of track 9 and the variation of the subsequent piston stroke.

La position de l'axe 5a de l'arbre 5 peut être indifférente au moins en théorie (hormis son orientation) et est représentée quelconque sur la figure. Il peut cependant être avantageux de la prévoir à l'aplomb des axes 2a. La disposition selon l'invention permet de choisir au mieux des possibilités technologiques la position de cet axe.The position of the axis 5a of the shaft 5 can be indifferent at least in theory (apart from its orientation) and is shown arbitrarily in the figure. It may however be advantageous to provide it directly above the axes 2a. The arrangement according to the invention tion makes it possible to choose the position of this axis to the best of technological possibilities.

En se reportant enfin aux figures 4A et 4B, on voit que le plateau 4 comporte en guise de portion de surface une ligne 11 dont la trace dans le plan perpendiculaire susdit est constituée par la trace de l'axe 5a lui-même. Ainsi, l'axe 5a est contenu dans le plan du plateau 4 et est tangent à la ligne 11 qui est la ligne des points de contact des pistons sur le plateau. Dans cette réalisation.plus simple, le résultat recherché n'est obtenu qu'à une approximation près due à l'épaisseur matérielle des pièces mises en oeuvre, approximation qui peut dans bien des cas être suffisante.Referring finally to FIGS. 4A and 4B, it can be seen that the plate 4 comprises, by way of surface portion, a line 11, the trace of which in the above-mentioned perpendicular plane consists of the trace of the axis 5a itself. Thus, the axis 5a is contained in the plane of the plate 4 and is tangent to the line 11 which is the line of the points of contact of the pistons on the plate. In this simpler embodiment, the desired result is obtained only to an approximation due to the material thickness of the parts used, an approximation which can in many cases be sufficient.

L'invention trouve une application intéressante dans le domaine des pompes de précision.The invention finds an interesting application in the field of precision pumps.

Elle n'est pas limitée à la description qui vient d'en être donnée, mais couvre au contraire toutes les variantes qui pourraient lui être apportées sans sortir de son cadre ni de son esprit.It is not limited to the description which has just been given, but on the contrary covers all the variants which could be made to it without departing from its scope or its spirit.

Claims (8)

1. Pompe à pistons alternatifs du.type à barillet fixe (1) comportant une pluralité de pistons (2) parallèles dont les axes (2a) sont régulièrement répartis sur un cylindre et qui sont maintenus en appui par leur extrémité extérieure (2b) au barillet sur un plateau (4) tournant autour de l'axe (la) dudit cylindre et susceptible d'être incliné autour d'un arbre (5) perpendiculaire à l'axe (la) du cylindre susdit, caractérisée en ce que la portion de surface (7) du plateau (4) sur laquelle s'appuient lesdites extrémités (2b) des pistons possède dans un plan passant par l'axe dudit cylindre (la) et perpendiculaire audit arbre (5) d'articulation du plateau (4) une trace (7a) circulaire centrée sur l'axe (5a) de l'arbre d'articulation (5).1. pump with reciprocating pistons du.type fixed barrel (1) comprising a plurality of pistons (2) parallel whose axes (2a) are regularly distributed on a cylinder and which are held in abutment by their outer end (2b) at barrel on a plate (4) rotating around the axis (la) of said cylinder and capable of being inclined around a shaft (5) perpendicular to the axis (la) of the said cylinder, characterized in that the portion surface (7) of the plate (4) on which said ends (2b) of the pistons rest has in a plane passing through the axis of said cylinder (la) and perpendicular to said shaft (5) of articulation of the plate (4 ) a circular trace (7a) centered on the axis (5a) of the articulation shaft (5). 2. Pompe selon la revendication 1, caractérisée en ce que ladite portion de surface (7) est torique et est définie par la surface engendrée par la trace (7a) susdite lors d'un mouvement de révolution autour de l'axe (la) dudit cylindre.2. Pump according to claim 1, characterized in that said surface portion (7) is toric and is defined by the surface generated by the aforementioned trace (7a) during a movement of revolution around the axis (la) of said cylinder. 3. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que le contact (8) entre les extrémités (2b) des pistons susdites et ladite portion de surface (7) est pratiquement ponctuel.3. Pump according to any one of the preceding claims, characterized in that the contact (8) between the ends (2b) of the aforementioned pistons and said surface portion (7) is practically punctual. 4. Pompe selon la revendication 1, caractérisée en ce que ladite portion de surface est réduite à une ligne dont la trace dans le plan susdit est constituée par la trace de l'axe de l'arbre d'articulation susdit.4. Pump according to claim 1, characterized in that said surface portion is reduced to a line whose trace in the above plane is formed by the trace of the axis of the aforementioned articulation shaft. 5. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que l'inclinaison du plateau est réglée au moyen d'un point d'appui mobile (6) le long de l'axe dudit cylindre (la) qui coopère avec une face du plateau (4b) opposée à celle pourvue de la portion de surface 7 susdite et en ce que la partie de contact de cette face (4b) avec ledit point (6) présente un profil de came permettant une variation de la course des pistons proportionnelle au déplacement du point le long dudit axe (la).5. Pump according to any one of the preceding claims, characterized in that the inclination of the plate is adjusted by means of a movable fulcrum (6) along the axis of said cylinder (la) which cooperates with a face of the plate (4b) opposite to that provided with the above-mentioned surface portion 7 and in that the contact part of this face (4b) with said point (6) has a cam profile allowing a variation in the travel of the pistons proportional to the displacement of the point along said axis (la). 6. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que l'inclinaison du plateau est réglée par une piste circulaire (9) centrée sur l'axe dudit cylindre coopérant avec une partie (4c) du plateau diamétralement opposée à l'axe d'articulation (5) susdit, ladite piste étant réglable en position 1e long dudit axe (la).6. Pump according to any one of the preceding claims, characterized in that the inclination of the plate is adjusted by a circular track (9) centered on the axis of said cooperated cylinder rant with a part (4c) of the plate diametrically opposite the aforementioned articulation axis (5), said track being adjustable in position 1st along said axis (la). 7. Pompe selon la revendication 6, caractérisée en ce que le contact entre ladite partie du plateau et la piste est assuré le long d'un profil de came ménagé sur ladite partie permettant une variation de la course des pistons proportionnelle au déplacement de ladite piste.7. Pump according to claim 6, characterized in that the contact between said part of the plate and the track is ensured along a cam profile formed on said part allowing a variation of the piston stroke proportional to the movement of said track . 8. Pompe selon l'une quelconque des revendications 5 à 7, caractérisée en ce que le point de contact des pistons avec la portion de surface (7) susdite évolue le long d'un profil de came (2b) ménagé à l'extrémité desdits pistons (2) pour permettre une variation de la course de ces derniers proportionnelle au déplacement de l'élément de commande (6, 9) de l'inclinaison du plateau.8. Pump according to any one of claims 5 to 7, characterized in that the point of contact of the pistons with the above-mentioned surface portion (7) evolves along a cam profile (2b) formed at the end said pistons (2) to allow a variation of the stroke of the latter proportional to the movement of the control element (6, 9) of the inclination of the plate.
EP81400765A 1980-05-14 1981-05-13 Wobble plate of an axial-type piston pump Expired EP0040161B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400765T ATE10301T1 (en) 1980-05-14 1981-05-13 CONTROLLABLE AXIAL PISTON PUMP WITH FIXED CYLINDER BLOCK.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8010916A FR2484555B1 (en) 1980-05-14 1980-05-14 PUMP DEVICE FOR LIQUID
FR8010916 1980-05-14
FR8106018A FR2502702B1 (en) 1981-03-25 1981-03-25 ALTERNATIVE PISTON PUMP WITH FIXED BARREL AND TURNTABLE
FR8106018 1981-03-25

Publications (2)

Publication Number Publication Date
EP0040161A1 true EP0040161A1 (en) 1981-11-18
EP0040161B1 EP0040161B1 (en) 1984-11-14

Family

ID=26221781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400765A Expired EP0040161B1 (en) 1980-05-14 1981-05-13 Wobble plate of an axial-type piston pump

Country Status (3)

Country Link
EP (1) EP0040161B1 (en)
DE (1) DE3167159D1 (en)
IT (1) IT1142504B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0709572A1 (en) 1994-10-26 1996-05-01 François Couillard Pumping system with pistons displacing fluids at a constant flow rate
FR2836185A1 (en) 2002-02-21 2003-08-22 Inst Francais Du Petrole METHOD AND SYSTEM FOR THE FINE DOSING OF INJECTED FLUIDS IN A PUMP INSATLLATION
CN107939626A (en) * 2017-11-13 2018-04-20 山东科技大学 High-precision medical solution pressue device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2349310A (en) * 1942-05-23 1944-05-23 Wagner Electric Corp Pump and control means therefor
FR1221317A (en) * 1958-03-15 1960-06-01 Automatically variable flow pump
US2964234A (en) * 1954-05-13 1960-12-13 Houdaille Industries Inc Constant clearance volume compressor
FR1473091A (en) * 1966-01-06 1967-03-17 Variable flow hydraulic pump
FR2046559A5 (en) * 1969-05-10 1971-03-05 Bosch
US3663226A (en) * 1969-04-22 1972-05-16 Arnold E Biermann Variable piston-stroke mechanisms
FR2224649A1 (en) * 1973-04-04 1974-10-31 Borg Warner
FR2445891A1 (en) * 1979-01-05 1980-08-01 Philips Nv TRANSMISSION FOR MACHINES EQUIPPED WITH VARIABLE STROKE PISTONS, MOVED BY A VENT AND A MOTION

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2349310A (en) * 1942-05-23 1944-05-23 Wagner Electric Corp Pump and control means therefor
US2964234A (en) * 1954-05-13 1960-12-13 Houdaille Industries Inc Constant clearance volume compressor
FR1221317A (en) * 1958-03-15 1960-06-01 Automatically variable flow pump
FR1473091A (en) * 1966-01-06 1967-03-17 Variable flow hydraulic pump
US3663226A (en) * 1969-04-22 1972-05-16 Arnold E Biermann Variable piston-stroke mechanisms
FR2046559A5 (en) * 1969-05-10 1971-03-05 Bosch
FR2224649A1 (en) * 1973-04-04 1974-10-31 Borg Warner
FR2445891A1 (en) * 1979-01-05 1980-08-01 Philips Nv TRANSMISSION FOR MACHINES EQUIPPED WITH VARIABLE STROKE PISTONS, MOVED BY A VENT AND A MOTION

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0709572A1 (en) 1994-10-26 1996-05-01 François Couillard Pumping system with pistons displacing fluids at a constant flow rate
FR2836185A1 (en) 2002-02-21 2003-08-22 Inst Francais Du Petrole METHOD AND SYSTEM FOR THE FINE DOSING OF INJECTED FLUIDS IN A PUMP INSATLLATION
US7048512B2 (en) 2002-02-21 2006-05-23 Institut Francais Du Petrole Method and system intended for fine proportioning of fluids injected into a pumping installation with check valve proportioning compensation
CN107939626A (en) * 2017-11-13 2018-04-20 山东科技大学 High-precision medical solution pressue device
CN107939626B (en) * 2017-11-13 2019-06-11 山东科技大学 High-precision medical solution pressurizing device

Also Published As

Publication number Publication date
EP0040161B1 (en) 1984-11-14
DE3167159D1 (en) 1984-12-20
IT8148454A0 (en) 1981-05-13
IT1142504B (en) 1986-10-08

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