EP1436509A1 - Variable-delivery vane pump - Google Patents

Variable-delivery vane pump

Info

Publication number
EP1436509A1
EP1436509A1 EP02777077A EP02777077A EP1436509A1 EP 1436509 A1 EP1436509 A1 EP 1436509A1 EP 02777077 A EP02777077 A EP 02777077A EP 02777077 A EP02777077 A EP 02777077A EP 1436509 A1 EP1436509 A1 EP 1436509A1
Authority
EP
European Patent Office
Prior art keywords
vane pump
ring
recess
projection
movable ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02777077A
Other languages
German (de)
French (fr)
Other versions
EP1436509B1 (en
Inventor
Clément Kiefer
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.)
Pierburg Pump Technology France SARL
Original Assignee
Pierburg SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg SARL filed Critical Pierburg SARL
Publication of EP1436509A1 publication Critical patent/EP1436509A1/en
Application granted granted Critical
Publication of EP1436509B1 publication Critical patent/EP1436509B1/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation

Definitions

  • the present invention relates to a variable displacement vane pump comprising a body having a cavity in which can move a movable ring inside which is a hub which can rotate about a fixed axis and which is provided with vane which of the rotation bear against the internal face of the movable ring, and displacement means for displacing the movable ring, as a function of a pilot pressure, between a position centered on the axis of rotation of the hub and a predefined extreme position eccentric to the axis of rotation of the hub.
  • Vane pumps are commonly used to move different fluids, including water, oil or air for vacuum pumps. These pumps mainly consist of a pump body closed by a cover, forming the stator, and a rotor provided with radial slots in which the vanes can slide. Two successive vanes, with the inner wall of the body and the outer wall of the rotor as well as the bottom of the pump body and the cover, form a cell. The suction and the delivery of the fluid are done by the lower and upper walls formed by the bottom of the pump body and the cover. The cells are still small near the suction channel. During the rotation of the rotor, the cell grows and fills with fluid. When the cell has reached its maximum size, it is separated from the suction channel and comes into contact with the delivery channel. The volume of the cell begins to decrease to reach its minimum volume thus driving back the fluid which it contained.
  • the variation of flow rate or outlet pressure can be obtained in different ways.
  • the cavity which is formed in the pump body has a doubly eccentric internal section, the rotor rotating at the center of this section. With this embodiment, it is not possible to modify the volume so that at a given speed the same pressure or the same flow rate is obtained.
  • Document US Pat. No. 3,771,921 A is known to be a device which can serve either as a pump or as a generator.
  • This device comprises a housing in which a movable ring can take three positions: a central position, corresponding to a neutral point, and two eccentric positions relative to the axis of the rotor, on either side of the neutral point.
  • the means for moving the ring consisting on the one hand of a spring and on the other hand of a cavity into which one end of the movable ring penetrates, make it possible to place the movable ring in the desired position.
  • the cavity is connected to the compressed air line of an external pump.
  • the ring When the external pump is started, the ring is pushed into a first eccentric position by the compressed air contained in the cavity against the effect of the compression spring, and the compressed air passes through the pump which starts to rotate then acting as a generator. If the external pump is stopped, the movable ring is moved by the spring towards the central position where it is blocked if a bar stops the recoil movement of the ring, or towards a second eccentric position, symmetrical to the first with respect to at neutral point. The rotor axis is then coupled to a motor and the pump acts as a simple vane pump without it being possible to act on its displacement. The movement of the ring makes it possible to modify the function of the device without acting on its displacement.
  • vane pumps designed such that it is possible to adjust their displacement to allow adjustment of the volume of the cells and therefore adjustment of the flow rate and the pressure.
  • variable displacement pumps operate on the same principle, but a movable ring is interposed between the cavity and the rotor.
  • the movable ring can move in the cavity between a position where it is concentric with the axis of rotation of the rotor (neutral point) and an extreme eccentric position. The further the axes are, the greater the volume of the cells.
  • the ring is held in the eccentric position by a return spring whose tension is adjustable.
  • a piston is placed opposite the spring and tends to push the ring back to the neutral position. The piston is supplied with the fluid leaving the pump so that the more the pressure increases, the more the piston pushes the ring towards the neutral position. When the pressure drops, the return spring tends to push the ring back to its eccentric position.
  • Such pumps are known for example from EP 0 398 377 A.
  • suction and delivery areas are not isolated, so that it is not possible to reach the balance of the ring.
  • the objective of the invention is to develop a variable displacement vane pump which does not require a piston or particular bore, and which is therefore simpler to manufacture.
  • a second objective of the invention is to allow better guidance and better balance of the ring.
  • the invention also aims to improve the tightness of the suction and discharge zones to ensure better stability of the ring and allow the balance of the ring to be reached.
  • the first objective is achieved by the vane pump in which the means for moving the movable ring comprise a recess made in the wall of the body cavity, and a projection formed on the external face of the ring and intended to slide. in the recess of the body cavity so as to form a pilot chamber in which the pilot pressure is applied.
  • the recess and the projection replace the piston of the prior art pump. The more the pressure increases in the piloting chamber, the more the force exerted on the projection tends to push the ring back into its neutral position.
  • control chamber formed by the recess and the projection communicates with the pressure zone of the pressure pump.
  • the same pressure prevails in the pressure zone of the pump and in the pilot chamber.
  • the pilot pressure applied in the pilot chamber formed by the recess and the projection depends on the pressure prevailing in the zone of use of the fluid pumped by the vane pump. This solution makes it possible to take account of the pressure drops between the pump discharge zone and the location of the motor where the pumped fluid is actually used.
  • the displacement means also comprise a return spring tending to move the movable ring in its extreme eccentric position. This return spring is preferably placed on the other side with respect to the recess and the projection.
  • the guide member ensures, with the projection, good guidance of the ring in the cavity of the pump body.
  • the guide member is preferably formed by two walls placed on the outer surface of the movable ring, on the other side with respect to the projection, mutually parallel and parallel to the lateral edges of the projection, these walls being intended to slide in a corresponding recess made in the wall of the body cavity.
  • means are provided for connecting the chamber formed by the guide recess and the guide member with the suction zone or the pressure zone of the pump. In the latter case, it will be necessary to size the guide member so that the force exerted on it by the pressurized fluid is less than the force exerted by the piloting pressure on the projection.
  • the housing and the movable ring so that the component perpendicular to the displacement of the ring results from the forces exerted on said movable ring is as small as possible, without necessarily being zero.
  • the different forces which are exerted on the ring are on the one hand the effort of the pressure of the fluid inside the ring and the effort of the pressure of the fluid on the outside of the ring and on the other hand the force of the pilot pressure in the pilot chamber and the force of the vanes on the ring as well as the force of the return spring.
  • This balance of the ring could for example be achieved by moving more or less the part of the projection located on the side of the discharge zone and the corresponding part of its recess and / or the guide wall located on the side of the discharge zone. delivery and the corresponding part of the guide recess towards the delivery area so that the section of the ring in contact with the delivery area is more or less large. Ring section which is in contact with the discharge zone can thus be more or less reduced as a function of the nominal pressure of the pump.
  • the section of the movable ring subjected to this pressure is smaller than for pumps with lower nominal pressure. The mobile ring is thus better balanced and it is subjected to less significant efforts.
  • means are provided for isolating the suction zone and the pressure zone.
  • the balance of the ring can be better achieved.
  • This sealing can be ensured in particular by the projection and the guide member.
  • the sealing means may further comprise sealing washers placed between the upper and lower faces of the body cavity and the corresponding upper and lower faces of the hub.
  • Figure 1 Top sectional view of the body of a vane pump according to a first embodiment of the invention
  • Figure 2 Cross section along V-V of the vane pump of Figure 1
  • Figure 3 Perspective view of a movable ring according to the first embodiment
  • Figure 4 Top view of the body of a vane pump according to a second embodiment of the invention.
  • the vane pump consists of a body (1) having a cavity (2) in which a movable ring (3) can move.
  • a hub (4) provided with vanes (5) which move in radial slots (6).
  • a cover (7) closes the cavity (2).
  • the volume defined by the inner wall of the movable ring (3) is a circular base cylinder in the examples presented in Figures 1 and 4. However, the base can also be elliptical for example. This volume is characterized by its center (A). When the center of the ring (A) coincides with the axis of rotation (R) of the hub (4), the pump is in neutral.
  • a return spring (8) tends to move the ring (3) in an eccentric position relative to the axis of rotation (R) of the hub (4).
  • a projection (9) is formed on the circumference of the ring (3) on the other side relative to the return spring (8). This projection (9) enters a corresponding recess (10) made in the wall of the cavity (2).
  • the suction channel (11) and the discharge channel (12) can be located either in the bottom of the cavity (2) of the body (1) or in the cover.
  • a supply channel connects the discharge zone (12) and the pilot chamber formed by the recess (10) and the projection (9) so that the same pressure prevails in this chamber as in the discharge zone .
  • pilot chamber not with the discharge zone of the pump, but with the zone of the motor supplied by the pump in which the pressure of the fluid which must be pilot prevails.
  • zone of the motor supplied by the pump in which the pressure of the fluid which must be pilot prevails.
  • the pressure exerted by the fluid in the pilot chamber and the force of the spring act against each other and define the position of the ring (3) relative to the axis of rotation of the hub (4) as a function of the pressure prevailing in the discharge zone (12) or of the zone of use of the fluid.
  • the center of the ring (A) therefore moves along a plane parallel to the axis of rotation (R) of the hub (4).
  • a guide member is produced on the periphery of the ring (3) on the side of the return spring (8).
  • This guide member is formed mainly of two walls (14, 15) placed on the external face of the ring (3). These walls are mutually parallel and parallel to the lateral edges of the projection (9), and therefore to the plane of displacement of the center (A) of the movable ring (3).
  • These guide walls (14, 15) penetrate inside a corresponding guide recess (16) formed in the cavity (2) of the body (1).
  • the return spring (8) bears on the ring (3) preferably between these two walls (14, 15).
  • one of the walls (14, 15), in the example of FIGS. 1 and 3 the wall (14) has a communication opening between the guide chamber and either the suction zone or the discharge zone. It is also possible to provide a channel in the cover or in the bottom of the cavity, solution adopted in the example presented in FIG. 4.
  • the section (17) of the external surface of the movable ring (3) which is subject to the outlet pressure prevailing in the discharge zone either greater or less depending on the nominal power of the pump.
  • the fulcrum of the spring (8) on the movable ring (3) can also be shifted towards the delivery zone.
  • the offset towards the discharge zone of the projection (9) / recess (10) of a part and / or of the guide wall (15) / of the recess (16) is calculated so that the perpendicular component the displacement of the ring of the resultant of the forces exerted on the latter is as small as possible. It is possible to leave this component non-zero, in order to ensure a good seal between the suction zone and the discharge zone.
  • the ring undergoes less effort and is less likely to wear or deform during use at the risk of seeing leaks appear between the two suction and discharge zones or seeing the ring get stuck.
  • the vane pump according to the invention is simpler to produce than the prior art pump. Furthermore, it does not require a piston. It is therefore more economical. Its guide members allow easy movement of the ring. These sealing means allow the balance of the ring to be reached. Thanks to the good balance of the movable ring, the different elements wear less quickly and the risk of malfunction is reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The invention concerns a variable-delivery vane pump comprising a body (1) having a cavity (2) wherein a mobile ring (3) can move inside which is a hub (4) rotatable about a fixed axis (R) and provided with vanes (5) which during rotation are supported against the inner surface of the mobile ring (3), and displacing means for moving the mobile ring (3), in accordance with a control pressure, between a position centered on the axis of rotation of the hub and a predefined extreme eccentric position relative to the axis of rotation (R) of the hub (4). The means displacing the mobile ring (3) comprise a control recess (10) provided in the wall of the cavity (2) of the body (1) and a projection (9) formed on the outer surface of the ring (3) designed to slide in the control recess (10) of the cavity (2) of the body (1) so as to form a control chamber wherein is applied the control pressure.

Description

Description POMPE A PALETTES A CYLINDRÉE VARIABLE Description VARIABLE CYLINDER VANE PUMP
La présente invention concerne une pompe à palettes à cylindrée variable comprenant un corps présentant une cavité dans laquelle peut se déplacer un anneau mobile à l'intérieur duquel se trouve un moyeu pouvant tourner autour d'un axe fixe et qui est muni de palettes qui lors de la rotation prennent appui contre la face interne de l'anneau mobile, et des moyens de déplacement pour déplacer l'anneau mobile, en fonction d'une pression de pilotage, entre une position centrée sur l'axe de rotation du moyeu et une position extrême prédéfinie excentrée par rapport à l'axe de rotation du moyeu.The present invention relates to a variable displacement vane pump comprising a body having a cavity in which can move a movable ring inside which is a hub which can rotate about a fixed axis and which is provided with vane which of the rotation bear against the internal face of the movable ring, and displacement means for displacing the movable ring, as a function of a pilot pressure, between a position centered on the axis of rotation of the hub and a predefined extreme position eccentric to the axis of rotation of the hub.
Les pompes à palettes sont couramment utilisées pour déplacer différents fluides, notamment de l'eau, de l'huile ou de l'air pour les pompes à vide. Ces pompes sont constituées principalement d'un corps de pompe fermé par un couvercle, formant le stator, et d'un rotor muni de fentes radiales dans lesquelles peuvent coulisser des palettes. Deux palettes successives, avec la paroi intérieure du corps et la paroi extérieure du rotor ainsi que le fond du corps de pompe et le couvercle, forment une cellule. L'aspiration et le refoulement du fluide se font par les parois inférieures et supérieures formées par le fond du corps de pompe et le couvercle. Près du canal d'aspiration, les cellules sont encore petites. Au cours de la rotation du rotor, la cellule grandit et se remplit de fluide. Lorsque la cellule a atteint sa taille maximale, elle est séparée du canal d'aspiration et entre en contact avec le canal de refoulement. Le volume de la cellule commence à diminuer pour atteindre son volume minimal refoulant ainsi le fluide qu'elle contenait.Vane pumps are commonly used to move different fluids, including water, oil or air for vacuum pumps. These pumps mainly consist of a pump body closed by a cover, forming the stator, and a rotor provided with radial slots in which the vanes can slide. Two successive vanes, with the inner wall of the body and the outer wall of the rotor as well as the bottom of the pump body and the cover, form a cell. The suction and the delivery of the fluid are done by the lower and upper walls formed by the bottom of the pump body and the cover. The cells are still small near the suction channel. During the rotation of the rotor, the cell grows and fills with fluid. When the cell has reached its maximum size, it is separated from the suction channel and comes into contact with the delivery channel. The volume of the cell begins to decrease to reach its minimum volume thus driving back the fluid which it contained.
La variation de débit ou de la pression de sortie peut être obtenue de différentes façons. Dans un premier mode de réalisation, la cavité qui est pratiquée dans le corps de pompe a une section interne doublement excentrique, le rotor tournant au centre de cette section. Avec ce mode de réalisation, il n'est pas possible de modifier le volume de sorte qu'à une vitesse donnée on obtient la même pression ou le même débit.The variation of flow rate or outlet pressure can be obtained in different ways. In a first embodiment, the cavity which is formed in the pump body has a doubly eccentric internal section, the rotor rotating at the center of this section. With this embodiment, it is not possible to modify the volume so that at a given speed the same pressure or the same flow rate is obtained.
On connaît du document US 3,771 ,921 A un dispositif pouvant servir soit de pompe soit de générateur. Ce dispositif comprend un boîtier dans lequel un anneau mobile peut prendre trois positions : une position centrale, correspondant à un point neutre, et deux positions excentrées par rapport à l'axe du rotor, de part et d'autre du point neutre. Des moyens de déplacement de l'anneau, constitués d'une part d'un ressort et d'autre part d'une cavité dans laquelle pénètre une extrémité de l'anneau mobile, permettent de placer l'anneau mobile dans la position souhaitée. La cavité est raccordée à la canalisation d'air comprimé d'une pompe externe. Lorsque la pompe externe est mise en marche, l'anneau est poussé dans une première position excentrée par l'air comprimé contenu dans la cavité contre l'effet du ressort de compression, et l'air comprimé traverse la pompe qui se met à tourner agissant alors comme un générateur. Si la pompe externe est arrêtée, l'anneau mobile est déplacé par le ressort vers la position centrale où il est bloqué si une barre arrête le mouvement de recul de l'anneau, ou vers une seconde position excentrée, symétrique à la première par rapport au point neutre. L'axe du rotor est alors accouplé à un moteur et la pompe agit comme pompe à palettes simple sans qu'il soit possible d'agir sur sa cylindrée. Le déplacement de l'anneau permet de modifier la fonction du dispositif sans pour autant agir sur sa cylindrée.Document US Pat. No. 3,771,921 A is known to be a device which can serve either as a pump or as a generator. This device comprises a housing in which a movable ring can take three positions: a central position, corresponding to a neutral point, and two eccentric positions relative to the axis of the rotor, on either side of the neutral point. of the means for moving the ring, consisting on the one hand of a spring and on the other hand of a cavity into which one end of the movable ring penetrates, make it possible to place the movable ring in the desired position. The cavity is connected to the compressed air line of an external pump. When the external pump is started, the ring is pushed into a first eccentric position by the compressed air contained in the cavity against the effect of the compression spring, and the compressed air passes through the pump which starts to rotate then acting as a generator. If the external pump is stopped, the movable ring is moved by the spring towards the central position where it is blocked if a bar stops the recoil movement of the ring, or towards a second eccentric position, symmetrical to the first with respect to at neutral point. The rotor axis is then coupled to a motor and the pump acts as a simple vane pump without it being possible to act on its displacement. The movement of the ring makes it possible to modify the function of the device without acting on its displacement.
II existe des pompes à palettes conçues de telle sorte qu'il est possible de régler leur cylindrée pour permettre un réglage du volume des cellules et donc un réglage du débit et de la pression.There are vane pumps designed such that it is possible to adjust their displacement to allow adjustment of the volume of the cells and therefore adjustment of the flow rate and the pressure.
Ces pompes à cylindrée variable fonctionnent selon le même principe, mais un anneau mobile est intercalé entre la cavité et le rotor. L'anneau mobile peut se déplacer dans la cavité entre une position où il est concentrique à l'axe de rotation du rotor (point neutre) et une position extrême excentrée. Plus les axes sont éloignés, plus le volume des cellules est grand. L'anneau est maintenu en position excentrée par un ressort de rappel dont la tension est réglable. Un piston est placé à l'opposé du ressort et tend à repousser l'anneau vers la position neutre. Le piston est alimenté par le fluide sortant de la pompe de sorte que plus la pression augmente, plus le piston repousse l'anneau vers la position neutre. Lorsque la pression baisse, le ressort de rappel tend à repousser l'anneau vers sa position excentrée.These variable displacement pumps operate on the same principle, but a movable ring is interposed between the cavity and the rotor. The movable ring can move in the cavity between a position where it is concentric with the axis of rotation of the rotor (neutral point) and an extreme eccentric position. The further the axes are, the greater the volume of the cells. The ring is held in the eccentric position by a return spring whose tension is adjustable. A piston is placed opposite the spring and tends to push the ring back to the neutral position. The piston is supplied with the fluid leaving the pump so that the more the pressure increases, the more the piston pushes the ring towards the neutral position. When the pressure drops, the return spring tends to push the ring back to its eccentric position.
De telles pompes sont connues par exemple de EP 0 398 377 A.Such pumps are known for example from EP 0 398 377 A.
Ces pompes permettent donc une autorégulation du débit en fonction de la pression. Cependant, le système de piston représente un inconvénient majeur, car il nécessite un alésage correspondant, ce qui est coûteux. Par ailleurs, le mouvement de l'anneau mobile dans le boîtier soit n'est pas guidé, soit se fait par des surfaces latérales situées sur les bords de la cavité, parallèles au plan de déplacement de l'anneau mobile, sur lesquelles glissent des surfaces correspondantes de l'anneau. Par ailleurs, l'anneau se trouve parfois déséquilibré en raison de la pression latérale qui s'exerce sur lui dans la zone de refoulement, ce qui peut conduire à une usure prématurée des différentes pièces et à un dysfonctionnement du système.These pumps therefore allow self-regulation of the flow rate as a function of the pressure. However, the piston system represents a major drawback, since it requires a corresponding bore, which is expensive. Furthermore, the movement of the movable ring in the housing is either not guided, or is effected by lateral surfaces located on the edges of the cavity, parallel to the plane of movement of the movable ring, over which slide corresponding surfaces of the ring. In addition, the ring is sometimes unbalanced due to the lateral pressure exerted on it in the delivery zone, which can lead to premature wear of the different parts and to a malfunction of the system.
Enfin, les zones d'aspiration et de refoulement ne sont pas isolées, de sorte qu'il n'est pas possible d'atteindre l'équilibre de l'anneau.Finally, the suction and delivery areas are not isolated, so that it is not possible to reach the balance of the ring.
L'objectif de l'invention est de développer une pompe à palettes à cylindrée variable qui ne nécessite pas de piston ni d'alésage particulier, et qui soit par conséquent plus simple à fabriquer. Un second objectif de l'invention est de permettre un meilleur guidage et un meilleur équilibre de l'anneau. Enfin, l'invention a également pour objectif d'améliorer l'étanchéité des zones d'aspiration et de refoulement pour assurer une meilleure stabilité de l'anneau et permettre d'atteindre l'équilibre de l'anneau.The objective of the invention is to develop a variable displacement vane pump which does not require a piston or particular bore, and which is therefore simpler to manufacture. A second objective of the invention is to allow better guidance and better balance of the ring. Finally, the invention also aims to improve the tightness of the suction and discharge zones to ensure better stability of the ring and allow the balance of the ring to be reached.
Le premier objectif est atteint par la pompe à palettes dans laquelle les moyens de déplacement de l'anneau mobile comprennent un évidement pratiqué dans la paroi de la cavité du corps, et une saillie formée sur la face externe de l'anneau et destinée à coulisser dans l'évidement de la cavité du corps de sorte à former une chambre de pilotage dans laquelle est appliquée la pression de pilotage. L'évidement et la saillie remplacent le piston de la pompe de l'état de la technique. Plus la pression augmente dans la chambre de pilotage, plus la force exercée sur la saillie tend à repousser l'anneau dans sa position neutre.The first objective is achieved by the vane pump in which the means for moving the movable ring comprise a recess made in the wall of the body cavity, and a projection formed on the external face of the ring and intended to slide. in the recess of the body cavity so as to form a pilot chamber in which the pilot pressure is applied. The recess and the projection replace the piston of the prior art pump. The more the pressure increases in the piloting chamber, the more the force exerted on the projection tends to push the ring back into its neutral position.
Dans un mode privilégié de réalisation de l'invention, la chambre de pilotage formée par l'évidement et la saillie communique avec la zone de pression de la pompe pression. Ainsi, il règne la même pression dans la zone de pression de la pompe et dans la chambre de pilotage.In a preferred embodiment of the invention, the control chamber formed by the recess and the projection communicates with the pressure zone of the pressure pump. Thus, the same pressure prevails in the pressure zone of the pump and in the pilot chamber.
Il est également possible que la pression de pilotage appliquée dans la chambre de pilotage formée par l'évidement et la saillie dépende de la pression régnant dans la zone d'utilisation du fluide pompé par la pompe à palettes. Cette solution permet de tenir compte des pertes de charge entre la zone de refoulement de la pompe et l'endroit du moteur où le fluide pompé est effectivement utilisé. Afin d'assurer le retour de l'anneau en position excentrée, il est prévu que les moyens de déplacement comprennent également un ressort de rappel tendant à déplacer l'anneau mobile dans sa position extrême excentrée. Ce ressort de rappel est placé de préférence de l'autre côté par rapport à l'évidement et la saillie.It is also possible that the pilot pressure applied in the pilot chamber formed by the recess and the projection depends on the pressure prevailing in the zone of use of the fluid pumped by the vane pump. This solution makes it possible to take account of the pressure drops between the pump discharge zone and the location of the motor where the pumped fluid is actually used. In order to ensure the return of the ring to the eccentric position, it is provided that the displacement means also comprise a return spring tending to move the movable ring in its extreme eccentric position. This return spring is preferably placed on the other side with respect to the recess and the projection.
Afin d'améliorer le guidage de l'anneau mobile dans la cavité du corps, il est prévu de munir la pompe d'un organe de guidage. L'organe de guidage assure avec la saillie un bon guidage de l'anneau dans la cavité du corps de pompe. L'organe de guidage est de préférence formé de deux parois placées sur la surface extérieure de l'anneau mobile, de l'autre côté par rapport à la saillie, parallèles entre elles et parallèles aux bords latéraux de la saillie, ces parois étant destinées à coulisser dans un évidement correspondant pratiqué dans la paroi de la cavité du corps. Ce mode de réalisation simple permet une mise en œuvre industrielle peu coûteuse. Il est ainsi possible de renoncer aux surfaces latérales de guidage pratiquées d'une part dans les parois de la cavité et sur les bords latéraux de l'anneau.In order to improve the guidance of the movable ring in the body cavity, provision is made to provide the pump with a guide member. The guide member ensures, with the projection, good guidance of the ring in the cavity of the pump body. The guide member is preferably formed by two walls placed on the outer surface of the movable ring, on the other side with respect to the projection, mutually parallel and parallel to the lateral edges of the projection, these walls being intended to slide in a corresponding recess made in the wall of the body cavity. This simple embodiment allows inexpensive industrial implementation. It is thus possible to dispense with the lateral guide surfaces formed on the one hand in the walls of the cavity and on the lateral edges of the ring.
Dans un mode de réalisation préférentiel, des moyens sont prévus pour relier la chambre formée par l'évidement de guidage et l'organe de guidage avec la zone d'aspiration ou la zone de pression de la pompe. Dans ce dernier cas, il faudra dimensionner l'organe de guidage de telle sorte que la force exercée sur lui par le fluide sous pression soit inférieure à la force exercée par la pression de pilotage sur la saillie.In a preferred embodiment, means are provided for connecting the chamber formed by the guide recess and the guide member with the suction zone or the pressure zone of the pump. In the latter case, it will be necessary to size the guide member so that the force exerted on it by the pressurized fluid is less than the force exerted by the piloting pressure on the projection.
Afin d'assurer un meilleur équilibre de l'anneau mobile dans la cavité, il est préférable de dimensionner le boîtier et l'anneau mobile de telle sorte que la composante perpendiculaire au déplacement de l'anneau de la résultante des forces s'exerçant sur ledit anneau mobile est la plus faible possible, sans être nécessairement nulle. Les différentes forces qui s'exercent sur l'anneau sont d'une part l'effort de la pression du fluide à l'intérieur de l'anneau et l'effort de la pression du fluide sur l'extérieur de l'anneau et d'autre part l'effort de la pression de pilotage dans la chambre de pilotage et l'effort des palettes sur l'anneau ainsi que l'effort du ressort de rappel. Cet équilibre de l'anneau pourra être par exemple réalisé en déplaçant plus ou moins la partie de la saillie située du côté de la zone de refoulement et la partie correspondante de son évidement et / ou la paroi de guidage située du côté de la zone de refoulement et la partie correspondante de l'évidement de guidage vers la zone de refoulement afin que la section de l'anneau en contact avec la zone de refoulement soit plus ou moins importante. La section de l'anneau qui est en contact avec la zone de refoulement peut être ainsi plus au moins diminuée en fonction de la pression nominale de la pompe. Ainsi, pour les pompes à pression nominale élevée dans lesquelles la pression susceptible de régner dans la zone de refoulement est très importante, la section de l'anneau mobile soumise à cette pression est plus faible que pour les pompes à pression nominale plus faible. L'anneau mobile est ainsi mieux équilibré et il est soumis à des efforts moins importants.In order to ensure a better balance of the movable ring in the cavity, it is preferable to size the housing and the movable ring so that the component perpendicular to the displacement of the ring results from the forces exerted on said movable ring is as small as possible, without necessarily being zero. The different forces which are exerted on the ring are on the one hand the effort of the pressure of the fluid inside the ring and the effort of the pressure of the fluid on the outside of the ring and on the other hand the force of the pilot pressure in the pilot chamber and the force of the vanes on the ring as well as the force of the return spring. This balance of the ring could for example be achieved by moving more or less the part of the projection located on the side of the discharge zone and the corresponding part of its recess and / or the guide wall located on the side of the discharge zone. delivery and the corresponding part of the guide recess towards the delivery area so that the section of the ring in contact with the delivery area is more or less large. Ring section which is in contact with the discharge zone can thus be more or less reduced as a function of the nominal pressure of the pump. Thus, for pumps with high nominal pressure in which the pressure liable to prevail in the discharge zone is very large, the section of the movable ring subjected to this pressure is smaller than for pumps with lower nominal pressure. The mobile ring is thus better balanced and it is subjected to less significant efforts.
Dans une variante de l'invention, des moyens sont prévus pour isoler la zone d'aspiration et la zone de pression. En isolant les zones d'aspiration et de refoulement on peut mieux atteindre l'équilibre de l'anneau. Cette étanchéité peut être assurée notamment par la saillie et l'organe de guidage. En laissant la composante perpendiculaire au déplacement de l'anneau de la résultante des forces s'exerçant sur ce dernier légèrement supérieure à zéro, on assure une bonne étanchéité en plaquant la saillie et l'une des parois de guidage dans leur évidement respectif du côté de la zone d'aspiration ou de refoulement. Le jeu nécessaire au bon coulissement de la saillie et des parois de guidage dans leur évidement respectif n'est ainsi pas une cause de fuite. Les moyens d'étanchéité peuvent comprendre en outre des rondelles d'étanchéité placées entre les faces supérieure et inférieure de la cavité du corps et les faces supérieure et inférieure correspondantes du moyeu.In a variant of the invention, means are provided for isolating the suction zone and the pressure zone. By isolating the suction and discharge zones, the balance of the ring can be better achieved. This sealing can be ensured in particular by the projection and the guide member. By leaving the component perpendicular to the displacement of the ring of the resultant of the forces exerted on the latter slightly greater than zero, a good seal is ensured by pressing the projection and one of the guide walls in their respective recesses on the side from the suction or discharge area. The play necessary for the proper sliding of the projection and of the guide walls in their respective recesses is therefore not a cause of leakage. The sealing means may further comprise sealing washers placed between the upper and lower faces of the body cavity and the corresponding upper and lower faces of the hub.
L'invention sera décrite plus en détail ci-dessous à l'aide des figures suivantes : Figure 1 : Vue en coupe de dessus du corps d'une pompe à palettes selon un premier mode de réalisation de l'invention ; Figure 2 : Coupe transversale selon V-V de la pompe à palettes de la figure 1 ; Figure 3 : Vue en perspective d'un anneau mobile selon le premier mode de réalisation ; Figure 4 : Vue de dessus du corps d'une pompe à palettes selon un second mode de réalisation de l'invention.The invention will be described in more detail below using the following figures: Figure 1: Top sectional view of the body of a vane pump according to a first embodiment of the invention; Figure 2: Cross section along V-V of the vane pump of Figure 1; Figure 3: Perspective view of a movable ring according to the first embodiment; Figure 4: Top view of the body of a vane pump according to a second embodiment of the invention.
Les deux exemples de réalisation présentés ci-dessous présentent les mêmes éléments qui sont donc numérotés de la même manière.The two exemplary embodiments presented below have the same elements which are therefore numbered in the same way.
La pompe à palettes est constituée d'un corps (1) présentant une cavité (2) dans laquelle peut se déplacer un anneau mobile (3). Au centre de la cavité (2) et à l'intérieur de l'anneau mobile (3) se trouve un moyeu (4) muni de palettes (5) qui se déplacent dans des fentes radiales (6). Un couvercle (7) ferme la cavité (2). Le volume défini par la paroi intérieure de l'anneau mobile (3) est un cylindre de base circulaire dans les exemples présentés aux figures 1 et 4. Cependant, la base peut être également elliptique par exemple. Ce volume est caractérisé par son centre (A). Lorsque le centre de l'anneau (A) est confondu avec l'axe de rotation (R) du moyeu (4), la pompe se trouve au point mort.The vane pump consists of a body (1) having a cavity (2) in which a movable ring (3) can move. In the center of the cavity (2) and inside the movable ring (3) is a hub (4) provided with vanes (5) which move in radial slots (6). A cover (7) closes the cavity (2). The volume defined by the inner wall of the movable ring (3) is a circular base cylinder in the examples presented in Figures 1 and 4. However, the base can also be elliptical for example. This volume is characterized by its center (A). When the center of the ring (A) coincides with the axis of rotation (R) of the hub (4), the pump is in neutral.
Un ressort de rappel (8), dont la tension peut être réglée par des moyens de réglage habituels, tend à déplacer l'anneau (3) en position excentrée par rapport à l'axe de rotation (R) du moyeu (4). Une saillie (9) est formée sur la circonférence de l'anneau (3) de l'autre côté par rapport au ressort de rappel (8). Cette saillie (9) pénètre dans un évidement (10) correspondant réalisé dans la paroi de la cavité (2).A return spring (8), the tension of which can be adjusted by usual adjustment means, tends to move the ring (3) in an eccentric position relative to the axis of rotation (R) of the hub (4). A projection (9) is formed on the circumference of the ring (3) on the other side relative to the return spring (8). This projection (9) enters a corresponding recess (10) made in the wall of the cavity (2).
Le canal d'aspiration (11) et le canal de refoulement (12) peuvent être situés soit dans le fond de la cavité (2) du corps (1) soit dans le couvercle. Un canal d'alimentation relie la zone de refoulement (12) et la chambre de pilotage formée par l'évidement (10) et la saillie (9) de sorte qu'il règne dans cette chambre la même pression que dans la zone de refoulement.The suction channel (11) and the discharge channel (12) can be located either in the bottom of the cavity (2) of the body (1) or in the cover. A supply channel connects the discharge zone (12) and the pilot chamber formed by the recess (10) and the projection (9) so that the same pressure prevails in this chamber as in the discharge zone .
II est également possible de relier la chambre de pilotage non pas avec la zone de refoulement de la pompe, mais avec la zone du moteur alimentée par la pompe dans laquelle règne la pression du fluide qui doit être pilotée. Ainsi, on tient compte des pertes de charge entre la sortie de la pompe et la zone du moteur (ou de tout autre dispositif alimenté par la pompe) où le fluide doit être présent à une pression donnée.It is also possible to connect the pilot chamber not with the discharge zone of the pump, but with the zone of the motor supplied by the pump in which the pressure of the fluid which must be pilot prevails. Thus, account is taken of the pressure drops between the outlet of the pump and the area of the motor (or of any other device supplied by the pump) where the fluid must be present at a given pressure.
La pression exercée par le fluide dans la chambre de pilotage et la force du ressort agissent l'une contre l'autre et définissent la position de l'anneau (3) par rapport à l'axe de rotation du moyeu (4) en fonction de la pression régnant dans la zone de refoulement (12) ou de la zone d'utilisation du fluide. Le centre de l'anneau (A) se déplace donc selon un plan parallèle à l'axe de rotation (R) du moyeu (4).The pressure exerted by the fluid in the pilot chamber and the force of the spring act against each other and define the position of the ring (3) relative to the axis of rotation of the hub (4) as a function of the pressure prevailing in the discharge zone (12) or of the zone of use of the fluid. The center of the ring (A) therefore moves along a plane parallel to the axis of rotation (R) of the hub (4).
La solution ainsi retenue ne nécessite pas d'alésage ni de piston correspondant, ce qui rend ce mode de réalisation beaucoup plus économique.The solution thus retained does not require a bore or a corresponding piston, which makes this embodiment much more economical.
Par ailleurs, un organe de guidage est réalisé sur la périphérie de l'anneau (3) du côté du ressort de rappel (8). Cet organe de guidage est formé principalement de deux parois (14, 15) placées sur la face externe de l'anneau (3). Ces parois sont parallèles entre elles et parallèles aux bords latéraux de la saillie (9), et par conséquent au plan de déplacement du centre (A) de l'anneau mobile (3). Ces parois de guidage (14, 15) pénètrent à l'intérieur d'un évidement de guidage correspondant (16) pratiqué dans la cavité (2) du corps (1). Le ressort de rappel (8) prend appui sur l'anneau (3) de préférence entre ces deux parois (14, 15).Furthermore, a guide member is produced on the periphery of the ring (3) on the side of the return spring (8). This guide member is formed mainly of two walls (14, 15) placed on the external face of the ring (3). These walls are mutually parallel and parallel to the lateral edges of the projection (9), and therefore to the plane of displacement of the center (A) of the movable ring (3). These guide walls (14, 15) penetrate inside a corresponding guide recess (16) formed in the cavity (2) of the body (1). The return spring (8) bears on the ring (3) preferably between these two walls (14, 15).
Ces parois de guidage (14, 15), en coopération avec l'évidement de guidage (16) dans lequel elles peuvent coulisser, et la saillie de pilotage (9), en coopération avec l'évidement de pilotage (10), constituent des organes de guidage qui assurent un bon déplacement de l'anneau lors de l'utilisation.These guide walls (14, 15), in cooperation with the guide recess (16) in which they can slide, and the piloting projection (9), in cooperation with the pilot recess (10), constitute guide members which ensure good movement of the ring during use.
L'ajustement des dimensions de la saillie (9) et de l'évidement de pilotage (10) d'une part et des parois (14, 15) de guidage et de l'évidement de guidage (16) d'autre part assure une bonne étanchéité entre la zone d'aspiration et la zone de refoulement. Dans certains cas, il peut être nécessaire de compléter cette isolation par deux rondelles d'étanchéité (non représentées) placées entre la face supérieure du moyeu et le couvercle pour l'une et entre la face inférieure du moyeu et le fond de la cavité (2) du corps (1) pour la seconde.The adjustment of the dimensions of the projection (9) and of the piloting recess (10) on the one hand and of the guide walls (14, 15) and of the guiding recess (16) on the other hand ensures a good seal between the suction zone and the discharge zone. In some cases, it may be necessary to complete this insulation with two sealing washers (not shown) placed between the upper face of the hub and the cover for one and between the lower face of the hub and the bottom of the cavity ( 2) of the body (1) for the second.
Pour assurer un équilibre des pressions dans la chambre de guidage formée par les parois (14, 15), la périphérie de l'anneau (3) et l'évidement (16), l'une des parois (14, 15), dans l'exemple des figures 1 et 3 la paroi (14), présente une ouverture de communication entre la chambre de guidage et soit la zone d'aspiration soit la zone de refoulement. Il est également possible de prévoir un canal dans le couvercle ou dans le fond de la cavité, solution retenue dans l'exemple présenté à la figure 4.To ensure a balance of pressures in the guide chamber formed by the walls (14, 15), the periphery of the ring (3) and the recess (16), one of the walls (14, 15), in the example of FIGS. 1 and 3 the wall (14) has a communication opening between the guide chamber and either the suction zone or the discharge zone. It is also possible to provide a channel in the cover or in the bottom of the cavity, solution adopted in the example presented in FIG. 4.
Il est possible de creuser un évidement dans la saillie (9) formée sur la circonférence de l'anneau (3) pour permettre un gain de poids et de matière dans l'anneau, comme le montre la figure 1.It is possible to dig a recess in the projection (9) formed on the circumference of the ring (3) to allow a gain of weight and material in the ring, as shown in Figure 1.
Afin d'équilibrer l'anneau mobile (3) et d'éviter qu'il ne soit soumis à des efforts trop importants, il est préférable que la section (17) de la surface externe de l'anneau mobile (3) qui est soumise à la pression de sortie régnant dans la zone de refoulement soit plus ou moins importante en fonction de la puissance nominale de la pompe. Pour cela, il est possible par exemple, comme le montre la figure 4, de décaler plus ou moins la partie de la saillie (9) située du côté de la zone de refoulement et la partie correspondante de son évidement (10) et / ou la paroi de guidage (15) située du côté de la zone de refoulement et la partie correspondante de l'évidement de guidage (16) vers la zone de refoulement. Le point d'appui du ressort (8) sur l'anneau mobile (3) peut être également décalé vers la zone de refoulement. Le décalage vers la zone de refoulement de la saillie (9) / évidement (10) d'une parte et / ou de la paroi de guidage (15) / de l'évidement (16) est calculé de telle sorte que la composante perpendiculaire au déplacement de l'anneau de la résultante des forces s'exerçant sur ce dernier soit aussi faible que possible. Il est possible de laisser cette composante non nulle, afin d'assurer une bonne étanchéité entre la zone d'aspiration et la zone de refoulement. Ainsi équilibré, l'anneau subit moins d'efforts et risque moins de s'user ou de se déformer au cours de l'utilisation au risque de voir apparaître des fuites entre les deux zones d'aspiration et de refoulement ou de voir l'anneau se coincer.In order to balance the movable ring (3) and to prevent it from being subjected to excessive forces, it is preferable that the section (17) of the external surface of the movable ring (3) which is subject to the outlet pressure prevailing in the discharge zone either greater or less depending on the nominal power of the pump. For this, it is possible for example, as shown in FIG. 4, to offset more or less the part of the projection (9) situated on the side of the delivery zone and the corresponding part of its recess (10) and / or the guide wall (15) located on the side of the discharge zone and the corresponding part of the guide recess (16) towards the discharge zone. The fulcrum of the spring (8) on the movable ring (3) can also be shifted towards the delivery zone. The offset towards the discharge zone of the projection (9) / recess (10) of a part and / or of the guide wall (15) / of the recess (16) is calculated so that the perpendicular component the displacement of the ring of the resultant of the forces exerted on the latter is as small as possible. It is possible to leave this component non-zero, in order to ensure a good seal between the suction zone and the discharge zone. Thus balanced, the ring undergoes less effort and is less likely to wear or deform during use at the risk of seeing leaks appear between the two suction and discharge zones or seeing the ring get stuck.
La pompe à palettes conforme à l'invention est plus simple à réaliser que la pompe de l'état de la technique. Par ailleurs, elle ne nécessite pas de piston. Elle est donc plus économique. Ses organes de guidage permettent un déplacement aisé de l'anneau. Ces moyens d'étanchéité permettent d'atteindre l'équilibre de l'anneau. Grâce au bon équilibre de l'anneau mobile, les différents éléments s'usent moins vite et le risque de dysfonctionnement est diminué.The vane pump according to the invention is simpler to produce than the prior art pump. Furthermore, it does not require a piston. It is therefore more economical. Its guide members allow easy movement of the ring. These sealing means allow the balance of the ring to be reached. Thanks to the good balance of the movable ring, the different elements wear less quickly and the risk of malfunction is reduced.
Liste des références :List of references:
1. corps de pompe1. pump body
2. cavité2. cavity
3. anneau3. ring
4. moyeu4. hub
5. palettes5. pallets
6. fentes radiales6. radial slots
7. couvercle7. cover
8. ressort de rappel8. return spring
9. saillie9. projection
10. évidement de pilotage10. piloting recess
11. zone d'aspiration11. suction area
12. zone de refoulement 14. paroi de guidage12. delivery area 14. guide wall
15. paroi de guidage15. guide wall
16. évidement de guidage16. guide recess
17. section de la surface extérieure de l'anneau mobile en contact avec la zone de refoulement17. section of the external surface of the movable ring in contact with the discharge zone
A centre de l'anneauAt the center of the ring
R axe de rotation du moyeu R axis of rotation of the hub

Claims

Revendications claims
1. Pompe à palettes à cylindrée variable comprenant « un corps (1) présentant une cavité (2) dans laquelle peut se déplacer1. Variable displacement vane pump comprising "a body (1) having a cavity (2) in which can move
• un anneau mobile (3) à l'intérieur duquel se trouve• a movable ring (3) inside which is located
• un moyeu (4) pouvant tourner autour d'un axe fixe (R) et muni de palettes (5) qui lors de la rotation prennent appui contre la face interne de l'anneau mobile (3), • des moyens de déplacement pour déplacer l'anneau mobile (3), en fonction d'une pression de pilotage, entre une position centrée sur l'axe de rotation du moyeu (4) et une position extrême prédéfinie excentrée par rapport à l'axe de rotation du moyeu (4), caractérisée en ce que les moyens de déplacement de l'anneau mobile (3) comprennent un évidement (10) pratiqué dans la paroi de la cavité (2) du corps (1), et une saillie (9) formée sur la face externe de l'anneau mobile (3) et destinée à coulisser dans l'évidement• a hub (4) which can rotate about a fixed axis (R) and provided with pallets (5) which, during rotation, bear against the internal face of the movable ring (3), • displacement means for move the movable ring (3), as a function of a pilot pressure, between a position centered on the axis of rotation of the hub (4) and a predefined extreme position eccentric with respect to the axis of rotation of the hub ( 4), characterized in that the means for moving the movable ring (3) comprise a recess (10) formed in the wall of the cavity (2) of the body (1), and a projection (9) formed on the outer face of the movable ring (3) and intended to slide in the recess
(10) de la cavité (2) du corps (1) de sorte à former une chambre de pilotage dans laquelle est appliquée la pression de pilotage.(10) of the cavity (2) of the body (1) so as to form a pilot chamber in which the pilot pressure is applied.
2. Pompe à palettes selon la revendication 1 , caractérisée en ce que la chambre de pilotage formée par l'évidement (10) et la saillie (9) communique avec la zone de pression de la pompe.2. Vane pump according to claim 1, characterized in that the pilot chamber formed by the recess (10) and the projection (9) communicates with the pressure zone of the pump.
3. Pompe à palettes selon la revendication 1 , caractérisée en ce que la pression de pilotage appliquée dans la chambre de pilotage formée par l'évidement (10) et la saillie (9) dépend de la pression régnant dans la zone d'utilisation du fluide pompé par la pompe à palettes.3. Vane pump according to claim 1, characterized in that the pilot pressure applied in the pilot chamber formed by the recess (10) and the projection (9) depends on the pressure prevailing in the zone of use of the fluid pumped by the vane pump.
4. Pompe à palettes selon l'une des revendications précédentes, caractérisée en ce que les moyens de déplacement comprennent également un ressort de rappel (8) tendant à déplacer l'anneau mobile (3) dans sa position extrême excentrée, ledit ressort de rappel (8) étant de préférence placé de l'autre côté par rapport à l'évidement (10) et la saillie (9). 4. Vane pump according to one of the preceding claims, characterized in that the displacement means also comprise a return spring (8) tending to move the movable ring (3) in its extreme eccentric position, said return spring (8) being preferably placed on the other side with respect to the recess (10) and the projection (9).
5. Pompe à palettes selon l'une des revendications précédentes, caractérisée en ce qu'elle est munie d'un organe de guidage (14, 15, 16) pour guider l'anneau mobile (3) dans la cavité (2) du corps (1).5. Vane pump according to one of the preceding claims, characterized in that it is provided with a guide member (14, 15, 16) for guiding the movable ring (3) in the cavity (2) of the body (1).
6. Pompe à palettes selon la revendication précédente, caractérisée en ce que l'organe de guidage est formé de deux parois (14, 15) placées sur la surface extérieure de l'anneau mobile (3) de l'autre côté par rapport à la saillie (9), parallèles entre elles et parallèles aux bords latéraux de la saillie (9), ces parois (14, 15) étant destinées à coulisser dans un évidement (16) correspondant pratiqué dans la paroi de la cavité (2) du corps (1).6. Vane pump according to the preceding claim, characterized in that the guide member is formed by two walls (14, 15) placed on the outer surface of the movable ring (3) on the other side relative to the projection (9), parallel to each other and parallel to the lateral edges of the projection (9), these walls (14, 15) being intended to slide in a corresponding recess (16) formed in the wall of the cavity (2) of the body (1).
7. Pompe à palettes selon la revendication précédente, caractérisée en ce que des moyens sont prévus pour relier la chambre formée par l'évidement (16) de guidage et l'organe de guidage (14, 15) avec la zone d'aspiration ou la zone de pression de la pompe.7. Vane pump according to the preceding claim, characterized in that means are provided for connecting the chamber formed by the recess (16) and the guide guide member (14, 15) with the suction area or the pump pressure area.
8. Pompe à palettes selon l'une des revendications précédentes, caractérisée en ce que le boîtier (1) et l'anneau mobile (3) sont dimensionnés de telle sorte que la composante perpendiculaire au déplacement de l'anneau (3) de la résultante des forces s'exerçant sur ledit anneau mobile (3) est la plus faible possible, sans être nécessairement nulle.8. Vane pump according to one of the preceding claims, characterized in that the housing (1) and the movable ring (3) are dimensioned so that the component perpendicular to the movement of the ring (3) of the resulting from the forces exerted on said movable ring (3) is as low as possible, without necessarily being zero.
9. Pompe à palettes selon la revendication précédente, caractérisée en ce que l'équilibre des forces est réalisé en déplaçant plus ou moins la partie de la saillie (9) située du côté de la zone de refoulement et la partie correspondante de son évidement (10) et / ou la paroi de guidage (15) située du côté de la zone de refoulement et la partie correspondante de l'évidement de guidage (16) vers la zone de refoulement, afin que la section (17) de l'anneau en contact avec la zone de refoulement soit plus ou moins importante.9. Vane pump according to the preceding claim, characterized in that the balance of forces is achieved by moving more or less the part of the projection (9) located on the side of the discharge zone and the corresponding part of its recess ( 10) and / or the guide wall (15) located on the side of the discharge zone and the corresponding part of the guide recess (16) towards the discharge zone, so that the section (17) of the ring in contact with the discharge area is more or less important.
10. Pompe à palettes selon l'une des revendications précédentes, caractérisée en ce que des moyens sont prévus pour isoler la zone d'aspiration et la zone de pression.10. Vane pump according to one of the preceding claims, characterized in that means are provided for isolating the suction zone and the pressure zone.
11. Pompe à palettes selon la revendication précédente, caractérisée en ce que les moyens d'étanchéité comprennent la saillie (9) et l'organe de guidage (14, 15). 11. Vane pump according to the preceding claim, characterized in that the sealing means comprise the projection (9) and the guide member (14, 15).
12. Pompe à palettes selon la revendication 10 ou 11 , caractérisée en ce que les moyens d'étanchéité comprennent des rondelles d'étanchéité placées entre les faces supérieure et inférieure de la cavité (2) du corps (1) et les faces supérieure et inférieure correspondantes du moyeu (4). 12. Vane pump according to claim 10 or 11, characterized in that the sealing means comprise sealing washers placed between the upper and lower faces of the cavity (2) of the body (1) and the upper faces and corresponding lower hub (4).
EP02777077A 2001-09-12 2002-09-12 Variable-delivery vane pump Expired - Lifetime EP1436509B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0111825A FR2829535B1 (en) 2001-09-12 2001-09-12 VARIABLE CYLINDREE PALLET PUMP
FR0111825 2001-09-12
PCT/EP2002/010237 WO2003023228A1 (en) 2001-09-12 2002-09-12 Variable-delivery vane pump

Publications (2)

Publication Number Publication Date
EP1436509A1 true EP1436509A1 (en) 2004-07-14
EP1436509B1 EP1436509B1 (en) 2008-11-26

Family

ID=8867231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02777077A Expired - Lifetime EP1436509B1 (en) 2001-09-12 2002-09-12 Variable-delivery vane pump

Country Status (8)

Country Link
US (1) US7344361B2 (en)
EP (1) EP1436509B1 (en)
JP (1) JP2005502815A (en)
KR (1) KR20040029171A (en)
DE (1) DE60230053D1 (en)
ES (1) ES2318048T3 (en)
FR (1) FR2829535B1 (en)
WO (1) WO2003023228A1 (en)

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Also Published As

Publication number Publication date
US20040247463A1 (en) 2004-12-09
DE60230053D1 (en) 2009-01-08
ES2318048T3 (en) 2009-05-01
WO2003023228A1 (en) 2003-03-20
JP2005502815A (en) 2005-01-27
FR2829535A1 (en) 2003-03-14
FR2829535B1 (en) 2005-08-12
US7344361B2 (en) 2008-03-18
KR20040029171A (en) 2004-04-03
EP1436509B1 (en) 2008-11-26

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