EP2865892A1 - Hydraulic piston pump with two-way mirror distribution - Google Patents

Hydraulic piston pump with two-way mirror distribution Download PDF

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Publication number
EP2865892A1
EP2865892A1 EP20140188250 EP14188250A EP2865892A1 EP 2865892 A1 EP2865892 A1 EP 2865892A1 EP 20140188250 EP20140188250 EP 20140188250 EP 14188250 A EP14188250 A EP 14188250A EP 2865892 A1 EP2865892 A1 EP 2865892A1
Authority
EP
European Patent Office
Prior art keywords
pump
suction
housing
discharge
drainage
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.)
Withdrawn
Application number
EP20140188250
Other languages
German (de)
French (fr)
Inventor
François POREL
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.)
Hydro Leduc SAS
Original Assignee
Hydro Leduc SAS
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Filing date
Publication date
Application filed by Hydro Leduc SAS filed Critical Hydro Leduc SAS
Publication of EP2865892A1 publication Critical patent/EP2865892A1/en
Withdrawn legal-status Critical Current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
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • 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
    • F04B1/20—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 having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2042—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F03C1/0639—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
    • F03C1/0642—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons inclined on main shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/08—Distributing valve-gear peculiar thereto
    • F03C1/14—Distributing valve-gear peculiar thereto by driving liquid of engine
    • 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
    • F04B1/20—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 having rotary cylinder block
    • F04B1/22—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 having rotary cylinder block having two or more sets of cylinders or pistons
    • F04B1/24—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 having rotary cylinder block having two or more sets of cylinders or pistons inclined to the 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/04—Draining

Definitions

  • the present invention relates to a hydraulic piston pump and more particularly to a hydraulic piston pump in which the distribution is done by means of an ice.
  • this pump To enable an ice-distributing piston pump to be able to rotate in either straight or left-hand rotation, this pump must be constructed on the one hand by drawing a symmetrical distribution window so that the discharge zone of the pump can become a suction zone and vice versa; on the other hand by implanting on the pump orifices which can receive either a suction connection or a discharge connection.
  • each of the two pump ports will become either a suction port or a discharge port.
  • FR-A-2988143 describes a hydraulic motor with internal drainage.
  • the hydraulic motor has a drainage port communicating with an interior space of the engine casing, an intermediate duct into which the casing drainage orifice opens, a first non-return valve arranged between the intermediate duct and a first bi-directional hydraulic port and adapted to open under the effect of a positive pressure differential between the intermediate pipe and the first bidirectional hydraulic port, and a second non-return valve disposed between the intermediate pipe and a second bidirectional hydraulic port and adapted to open under the effect of a positive pressure differential between the intermediate pipe and the second bidirectional hydraulic port.
  • Such an arrangement allows the liquid from internal engine leakage to be removed from the crankcase. through that of the two check valves that is connected to the return port of the engine. In this device, the flaps are closed by default.
  • the object of the present invention is to provide a piston pump that can rotate either in right rotation or in left rotation without having to set up a specific drainage circuit of the pump.
  • the pump according to the present invention comprises a plurality of pistons sliding in bores formed in a cylinder rotatably mounted in a housing of the pump, said cylinder bearing against an ice distribution carried by a cylinder head, said ice distribution being provided with two symmetrical lunules alternately serving suction and discharge lunule in the direction of rotation of the pump, and is characterized in that the cylinder head is provided with two drainage channels putting an inner space of the housing in communication respectively with two suction / discharge ports of said cylinder head; each drainage channel being provided with a valve adapted to close the drainage channel in response to an overpressure in the suction / discharge orifice so that, in the direction of rotation of the pump, the internal space of the the housing is in communication through one of the drainage channels with the suction line; while the communication through the other drainage channel between the discharge and the inner space of the housing is closed.
  • the valve comprises each time a compression spring housed in the drainage channel so as to maintain the valve in an open position by default.
  • a discharge pipe B is connected to the other hole of the cylinder head 9.
  • An object of the present invention is to suppress this drainage circuit.
  • the cylinder head 9 is provided with two non-return valves 12 communicating with the suction / discharge orifices 20.
  • the non-return valve comprises a helical spring 13, a ball 12 acting as a valve and a channel 14 formed in the cylinder head 9 to connect each time the suction / discharge port 20 to the interior space 17 of the casing 6 of the pump.
  • the channel 14 opens into the casing 6 in line with a peripheral portion of the dispensing window 7 which has a fluid passage towards the interior space 17 of the casing 6.
  • the spring 13 is housed in a wide section of the channel 14, bearing between a shoulder of the channel 14 on the housing side and the ball 12 on the cylinder head side. By default, the spring 13 keeps the ball 12 away from a valve seat 18 surrounding the inlet of the channel 14.
  • the channel 14 is open as long as there is no excess pressure in the orifice of suction / discharge 20 with respect to the interior space 17, which is normally at atmospheric pressure.
  • the valve 12 is therefore a valve open by default which closes the channel 14 in response to an overpressure in the suction / discharge port 20 of the cylinder head.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

Pompe hydraulique comportant une pluralité de pistons (3) coulissant dans des alésages ménagés dans un barillet (5) monté en rotation dans un carter (6) de la pompe, ledit barillet (5) prenant appui contre une glace de distribution (7) portée par une culasse (9). Deux canaux de drainage (14) mettent un espace intérieur (17) du carter (6) en communication respectivement avec deux orifices d'aspiration/refoulement (20) de la culasse (9). Chaque canal de drainage (14) est muni d'un clapet (12) apte à obturer le canal de drainage en réponse à une surpression dans l'orifice d'aspiration/refoulement (20) de telle sorte que, selon le sens de rotation de la pompe, l'espace intérieur du carter (17) est en communication à travers l'un des canaux de drainage (14) avec la canalisation d'aspiration (A) ; tandis que la communication par l'autre canal de drainage (14) entre le refoulement et l'espace intérieur (17) du carter (6) est obturée.

Figure imgaf001
Hydraulic pump comprising a plurality of pistons (3) sliding in bores formed in a barrel (5) rotatably mounted in a casing (6) of the pump, said barrel (5) bearing against a dispensing ice (7) worn by a cylinder head (9). Two drainage channels (14) place an inner space (17) of the housing (6) in communication respectively with two suction / discharge ports (20) of the cylinder head (9). Each drainage channel (14) is provided with a valve (12) adapted to close the drainage channel in response to an overpressure in the suction / discharge orifice (20) so that, in the direction of rotation from the pump, the interior space of the housing (17) is in communication through one of the drainage channels (14) with the suction pipe (A); while the communication through the other drainage channel (14) between the discharge and the interior space (17) of the housing (6) is closed.
Figure imgaf001

Description

La présente invention concerne une pompe hydraulique à pistons et plus particulièrement une pompe hydraulique à pistons dans laquelle la distribution se fait au moyen d'une glace.The present invention relates to a hydraulic piston pump and more particularly to a hydraulic piston pump in which the distribution is done by means of an ice.

Pour permettre à une pompe à pistons à distribution par glace de pouvoir tourner soit en rotation droite soit en rotation gauche, il faut construire cette pompe d'une part en dessinant une glace de distribution symétrique de façon à ce que la zone de refoulement de la pompe puisse devenir une zone d'aspiration et réciproquement ; d'autre part en implantant sur la pompe des orifices qui puissent recevoir soit un raccord d'aspiration soit un raccord de refoulement.To enable an ice-distributing piston pump to be able to rotate in either straight or left-hand rotation, this pump must be constructed on the one hand by drawing a symmetrical distribution window so that the discharge zone of the pump can become a suction zone and vice versa; on the other hand by implanting on the pump orifices which can receive either a suction connection or a discharge connection.

Selon le sens de rotation de la pompe, chacun des deux orifices de la pompe deviendra soit un orifice d'aspiration, soit un orifice de refoulement.Depending on the direction of rotation of the pump, each of the two pump ports will become either a suction port or a discharge port.

Dans une telle disposition, les fuites de la glace de distribution côté refoulement de la pompe, qui est le côté en pression, vont être collectées par le carter de la pompe.In such an arrangement, the leakage of the delivery side delivery side of the pump, which is the pressure side, will be collected by the pump housing.

Pour évacuer ces fuites, il est nécessaire de prévoir une liaison du carter de la pompe vers le réservoir d'alimentation de la pompe en installant un circuit de drainage.To evacuate these leaks, it is necessary to provide a connection of the pump housing to the pump supply tank by installing a drainage circuit.

Cette nécessité de disposer un circuit de drainage est un inconvénient.This need for a drainage circuit is a disadvantage.

FR-A-2988143 décrit un moteur hydraulique à drainage interne. Le moteur hydraulique comporte un orifice de drainage communiquant avec un espace intérieur du carter du moteur, une conduite intermédiaire dans laquelle débouche l'orifice de drainage du carter, un premier clapet anti-retour disposé entre la conduite intermédiaire et un premier port hydraulique bidirectionnel et apte à s'ouvrir sous l'effet d'un différentiel de pression positif entre la conduite intermédiaire et le premier port hydraulique bidirectionnel, et un deuxième clapet anti-retour disposé entre la conduite intermédiaire et un deuxième port hydraulique bidirectionnel et apte à s'ouvrir sous l'effet d'un différentiel de pression positif entre la conduite intermédiaire et le deuxième port hydraulique bidirectionnel. Un tel agencement permet que le liquide provenant des fuites internes du moteur soit évacué du carter à travers celui des deux clapets anti-retour qui est relié au port de retour du moteur. Dans ce dispositif, les clapets sont fermés par défaut. FR-A-2988143 describes a hydraulic motor with internal drainage. The hydraulic motor has a drainage port communicating with an interior space of the engine casing, an intermediate duct into which the casing drainage orifice opens, a first non-return valve arranged between the intermediate duct and a first bi-directional hydraulic port and adapted to open under the effect of a positive pressure differential between the intermediate pipe and the first bidirectional hydraulic port, and a second non-return valve disposed between the intermediate pipe and a second bidirectional hydraulic port and adapted to open under the effect of a positive pressure differential between the intermediate pipe and the second bidirectional hydraulic port. Such an arrangement allows the liquid from internal engine leakage to be removed from the crankcase. through that of the two check valves that is connected to the return port of the engine. In this device, the flaps are closed by default.

L'objet de la présente invention est de réaliser une pompe à pistons pouvant tourner soit en rotation droite, soit en rotation gauche sans avoir à mettre en place un circuit spécifique de drainage de la pompe.The object of the present invention is to provide a piston pump that can rotate either in right rotation or in left rotation without having to set up a specific drainage circuit of the pump.

Dans ce but, la pompe selon la présente invention comporte une pluralité de pistons coulissant dans des alésages ménagés dans un barillet monté en rotation dans un carter de la pompe, ledit barillet prenant appui contre une glace de distribution portée par une culasse, ladite glace de distribution étant munie de deux lunules symétriques servant alternativement de lunule d'aspiration et de lunule de refoulement selon le sens de rotation de la pompe, et est caractérisée par le fait que la culasse est munie de deux canaux de drainage mettant un espace intérieur du carter en communication respectivement avec deux orifices d'aspiration/refoulement de ladite culasse ; chaque canal de drainage étant muni d'un clapet apte à obturer le canal de drainage en réponse à une surpression dans l'orifice d'aspiration/refoulement de telle sorte que, selon le sens de rotation de la pompe, l'espace intérieur du carter soit en communication à travers l'un des canaux de drainage avec la canalisation d'aspiration ; tandis que la communication par l'autre canal de drainage entre le refoulement et l'espace intérieur du carter soit obturée.For this purpose, the pump according to the present invention comprises a plurality of pistons sliding in bores formed in a cylinder rotatably mounted in a housing of the pump, said cylinder bearing against an ice distribution carried by a cylinder head, said ice distribution being provided with two symmetrical lunules alternately serving suction and discharge lunule in the direction of rotation of the pump, and is characterized in that the cylinder head is provided with two drainage channels putting an inner space of the housing in communication respectively with two suction / discharge ports of said cylinder head; each drainage channel being provided with a valve adapted to close the drainage channel in response to an overpressure in the suction / discharge orifice so that, in the direction of rotation of the pump, the internal space of the the housing is in communication through one of the drainage channels with the suction line; while the communication through the other drainage channel between the discharge and the inner space of the housing is closed.

Selon un mode de réalisation, le clapet comporte à chaque fois un ressort de compression logé dans le canal de drainage de manière à maintenir le clapet dans une position ouverte par défaut.According to one embodiment, the valve comprises each time a compression spring housed in the drainage channel so as to maintain the valve in an open position by default.

L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description suivante de plusieurs modes de réalisation particuliers de l'invention, donnés uniquement à titre illustratif et non limitatif, en référence aux dessins annexés.The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly in the course of the following description of several particular embodiments of the invention, given solely for illustrative and non-limiting purposes. with reference to the accompanying drawings.

Sur ces dessins :

  • La figure 1 est une vue en coupe longitudinale d'une pompe hydraulique à pistons de type connu.
  • La figure 2 est une vue en coupe selon la ligne D-D de la figure 1.
  • La figure 3 est une vue en perspective de la pompe de la figure 1 en rotation droite.
  • La figure 4 est une vue en perspective de la pompe de la figure 1 en rotation gauche.
  • La figure 5 est une vue partielle, en coupe longitudinale, illustrant le fonctionnement de la zone d'aspiration de la pompe selon l'invention.
  • La figure 6 est une vue partielle, en coupe longitudinale, illustrant le fonctionnement de la zone de refoulement de la pompe selon l'invention.
  • La figure 1 représente une pompe hydraulique à pistons comportant un arbre d'entrainement 1 muni d'un plateau 2 contre lequel prennent appui une pluralité de pistons 3 qui coulissent dans des alésages 4 ménagés dans un barillet 5 logé dans un carter 6, muni d'un orifice de drainage 8 fermé par un bouchon. Le barillet 5 prend appui contre une glace de distribution 7 portée par une culasse 9.
On these drawings:
  • The figure 1 is a longitudinal sectional view of a hydraulic piston pump of known type.
  • The figure 2 is a sectional view along the line DD of the figure 1 .
  • The figure 3 is a perspective view of the pump from the figure 1 in right rotation.
  • The figure 4 is a perspective view of the pump from the figure 1 in left rotation.
  • The figure 5 is a partial view, in longitudinal section, illustrating the operation of the suction zone of the pump according to the invention.
  • The figure 6 is a partial view, in longitudinal section, illustrating the operation of the discharge zone of the pump according to the invention.
  • The figure 1 represents a hydraulic piston pump comprising a drive shaft 1 provided with a plate 2 against which a plurality of pistons 3 slide, which slide in bores 4 formed in a cylinder 5 housed in a housing 6, provided with an orifice drainage 8 closed by a plug. The cylinder 5 bears against a distribution window 7 carried by a cylinder head 9.

Sur la figure 2, qui est un vue en coupe selon D-D de la figure 1, on voit que, de façon connue, la glace de distribution 7 comporte deux lunules 10 et 11 qui sont des ouvertures en forme de haricot et qui sont symétriques. Selon le sens de rotation de l'arbre 1, ces lunules serviront alternativement à l'aspiration ou au refoulement.

  • La figure 3 montre la position de la conduite d'aspiration A, lorsque l'arbre d'entrainement 1 est en rotation droite (ou sens de la montre).
  • La figure 4 montre la position de cette conduite d'aspiration A lorsque l'arbre d'entrainement tourne en rotation gauche (ou sens inverse de la montre).
On the figure 2 , which is a sectional view according to DD of the figure 1 it can be seen that, in a known manner, the dispensing ice 7 comprises two lunules 10 and 11 which are bean-shaped openings and which are symmetrical. Depending on the direction of rotation of the shaft 1, these lunulas will serve alternately to suction or discharge.
  • The figure 3 shows the position of the suction line A, when the drive shaft 1 is in right rotation (or direction of the watch).
  • The figure 4 shows the position of this suction line A when the drive shaft turns in left rotation (or opposite direction of the watch).

Une canalisation de refoulement B, non représentée aux figures 3 et 4 est branchée sur l'autre orifice de la culasse 9.A discharge pipe B, not shown in Figures 3 and 4 is connected to the other hole of the cylinder head 9.

Lors du fonctionnement de la pompe, il se produit des fuites de liquide hydraulique du côté refoulement de la pompe. Ces fuites sont collectées dans le carter 6 et seront évacuées par l'orifice de drainage 8, qui, peut être relié à un circuit de drainage pour ramener le liquide provenant des fuites au réservoir.During operation of the pump, hydraulic fluid leaks from the discharge side of the pump. These leaks are collected in the casing 6 and will be discharged through the drainage port 8, which can be connected to a drainage circuit to bring the liquid from the leaks to the reservoir.

Un but de la présente invention est de supprimer ce circuit de drainage.An object of the present invention is to suppress this drainage circuit.

Dans ce but la culasse 9 est munie de deux clapets anti-retour 12 communiquant avec les orifices d'aspiration/refoulement 20.For this purpose the cylinder head 9 is provided with two non-return valves 12 communicating with the suction / discharge orifices 20.

Ces deux clapets 12 ont pour effet :

  • d'une part de permettre à l'espace intérieur 17 du carter 6 de communiquer librement par l'un des clapets 12 avec l'orifice d'aspiration 20 et la canalisation d'aspiration A, comme cela est illustré à la figure 5, ce qui met l'espace intérieur 17 du carter 6 en liaison avec l'aspiration de la pompe et réalise le drainage de la pompe ;
  • d'autre part d'obturer, par l'autre clapet 12, la communication de l'orifice de refoulement 20 avec l'espace intérieur 17 du carter 6, comme cela est illustré à la figure 6.
These two valves 12 have the effect of:
  • on the one hand to allow the inner space 17 of the housing 6 to freely communicate by one of the valves 12 with the suction port 20 and the suction pipe A, as shown in FIG. figure 5 , which puts the inner space 17 of the housing 6 in connection with the suction of the pump and carries out the drainage of the pump;
  • on the other hand to block, by the other valve 12, the communication of the discharge orifice 20 with the internal space 17 of the casing 6, as illustrated in FIG. figure 6 .

Plus précisément, le clapet anti-retour comporte un ressort hélicoïdal 13, une bille 12 faisant office de clapet et un canal 14 ménagé dans la culasse 9 pour relier à chaque fois l'orifice d'aspiration/refoulement 20 à l'espace intérieur 17 du carter 6 de la pompe. Le canal 14 débouche dans le carter 6 au droit d'une portion périphérique de la glace de distribution 7 qui présente un passage de fluide vers l'espace intérieur 17 du carter 6.More specifically, the non-return valve comprises a helical spring 13, a ball 12 acting as a valve and a channel 14 formed in the cylinder head 9 to connect each time the suction / discharge port 20 to the interior space 17 of the casing 6 of the pump. The channel 14 opens into the casing 6 in line with a peripheral portion of the dispensing window 7 which has a fluid passage towards the interior space 17 of the casing 6.

Le ressort 13 est logé dans une section large du canal 14, en appui entre un épaulement du canal 14 côté carter et la bille 12 côté culasse. Par défaut, le ressort 13 maintient la bille 12 à distance d'un siège de clapet 18 entourant l'entrée du canal 14. Ainsi, le canal 14 est ouvert tant qu'il n'existe pas une surpression dans l'orifice d'aspiration/refoulement 20 par rapport à l'espace intérieur 17, qui est normalement à pression atmosphérique. Le clapet 12 est donc un clapet ouvert par défaut qui obture le canal 14 en réponse à une surpression dans l'orifice d'aspiration/refoulement 20 de la culasse.The spring 13 is housed in a wide section of the channel 14, bearing between a shoulder of the channel 14 on the housing side and the ball 12 on the cylinder head side. By default, the spring 13 keeps the ball 12 away from a valve seat 18 surrounding the inlet of the channel 14. Thus, the channel 14 is open as long as there is no excess pressure in the orifice of suction / discharge 20 with respect to the interior space 17, which is normally at atmospheric pressure. The valve 12 is therefore a valve open by default which closes the channel 14 in response to an overpressure in the suction / discharge port 20 of the cylinder head.

Bien que l'invention ait été décrite en liaison avec plusieurs modes de réalisation particuliers, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.Although the invention has been described in connection with several particular embodiments, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

L'usage du verbe « comporter », « comprendre » ou « inclure » et de ses formes conjuguées n'exclut pas la présence d'autres éléments ou d'autres étapes que ceux énoncés dans une revendication. L'usage de l'article indéfmi « un » pour un élément n'exclut pas, sauf mention contraire, la présence d'une pluralité de tels éléments.The use of the verb "to include", "to understand" or "to include" and its conjugated forms does not exclude the presence of other elements or steps other than those set out in a claim. The use of the indefinite article "an" for an element does not exclude, unless otherwise stated, the presence of a plurality of such elements.

Dans les revendications, tout signe de référence entre parenthèses ne saurait être interprété comme une limitation de la revendication.In the claims, any reference sign in parentheses can not be interpreted as a limitation of the claim.

Claims (1)

Pompe hydraulique à pistons du type comportant une pluralité de pistons (3) coulissant dans des alésages (4) ménagés dans un barillet (5) monté en rotation dans un carter (6) de la pompe, ledit barillet (5) prenant appui contre une glace de distribution (7) portée par une culasse (9), ladite glace de distribution (7) étant munie de deux lunules symétriques (10,11) servant alternativement de lunule d'aspiration et de lunule de refoulement selon le sens de rotation de la pompe, dans laquelle la culasse (9) est munie de deux canaux de drainage (14) mettant un espace intérieur (17) du carter (6) en communication respectivement avec deux orifices d'aspiration/refoulement (20) de ladite culasse (9) ; chaque canal de drainage (14) étant muni d'un clapet (12), caractérisée par le fait que le clapet (12) comporte à chaque fois un ressort de compression logé dans le canal de drainage (14) de manière à maintenir le clapet (12) dans une position ouverte par défaut, le clapet (12) étant apte à obturer le canal de drainage en réponse à une surpression dans l'orifice d'aspiration/refoulement (20) de telle sorte que, selon le sens de rotation de la pompe, l'espace intérieur du carter (17) soit en communication à travers l'un des canaux de drainage (14) avec la canalisation d'aspiration (A) ; tandis que la communication par l'autre canal de drainage (14) entre le refoulement et l'espace intérieur (17) du carter (6) soit obturée.Hydraulic piston pump of the type comprising a plurality of pistons (3) sliding in bores (4) formed in a cylinder (5) rotatably mounted in a casing (6) of the pump, said cylinder (5) bearing against a distribution window (7) carried by a cylinder head (9), said dispensing window (7) being provided with two symmetrical lunettes (10, 11) alternately serving suction and discharge heads in the direction of rotation of the the pump, in which the cylinder head (9) is provided with two drainage channels (14) placing an inner space (17) of the housing (6) in communication respectively with two suction / discharge ports (20) of said cylinder head ( 9); each drainage channel (14) being provided with a valve (12), characterized in that the valve (12) each comprises a compression spring housed in the drainage channel (14) so as to hold the flap (12) in an open position by default, the valve (12) being adapted to close the drainage channel in response to an overpressure in the suction / discharge port (20) so that, in the direction of rotation from the pump, the interior space of the housing (17) is in communication through one of the drainage channels (14) with the suction pipe (A); while communication through the other drainage channel (14) between the discharge and the interior space (17) of the housing (6) is closed.
EP20140188250 2013-10-22 2014-10-09 Hydraulic piston pump with two-way mirror distribution Withdrawn EP2865892A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1360278A FR3012181A1 (en) 2013-10-22 2013-10-22 HYDRAULIC PISTON PUMP WITH BI-DIRECTIONAL ICE DISTRIBUTION

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EP2865892A1 true EP2865892A1 (en) 2015-04-29

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EP20140188250 Withdrawn EP2865892A1 (en) 2013-10-22 2014-10-09 Hydraulic piston pump with two-way mirror distribution

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EP (1) EP2865892A1 (en)
FR (1) FR3012181A1 (en)

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FR3012181A1 (en) 2015-04-24

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