EP3090183B1 - Pompe volumétrique et son procédé de fonctionnement - Google Patents

Pompe volumétrique et son procédé de fonctionnement Download PDF

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Publication number
EP3090183B1
EP3090183B1 EP14830724.2A EP14830724A EP3090183B1 EP 3090183 B1 EP3090183 B1 EP 3090183B1 EP 14830724 A EP14830724 A EP 14830724A EP 3090183 B1 EP3090183 B1 EP 3090183B1
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EP
European Patent Office
Prior art keywords
pump
driving wheel
rotor
wheel
driven wheel
Prior art date
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Active
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EP14830724.2A
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German (de)
English (en)
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EP3090183A1 (fr
Inventor
Leonardo Cadeddu
Alessandro Fauda
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VHIT SpA
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VHIT SpA
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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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • 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
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C29/0057—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C29/0071—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft

Definitions

  • the present invention generally relates to a positive displacement pump and to a method of operating same.
  • the present invention relates to a rotary positive displacement vacuum pump equipped with devices arranged to modify the gear ratio between the drive members and the pump.
  • the present invention is applied in vacuum pumps operated by an internal combustion engine of a motor vehicle.
  • positive displacement pumps e. g. vacuum pumps arranged to generate and maintain, in a tank or booster, e. g. of a power brake, a vacuum or depression mainly serving for operating brakes and other devices requiring a vacuum in order to work.
  • document WO 2013054263 in the name of the Applicant, discloses a vacuum pump connected to a shaft of the engine and rotating at a speed equal to the speed of the shaft driving it.
  • Document WO 2004092588 discloses an oil pump and a vacuum pump integrated with each other and structurally independent from the engine.
  • the pump is to be located at a predetermined position, in correspondence of a driving wheel fixedly connected with the driving shaft.
  • the prior art pump has a rotor made of metal with gear wheels made of metal.
  • Document DE 102004016237 discloses a vacuum pump having two rotors and two corresponding shafts externally equipped with two gear wheels; one of the gear wheels is driven by an internally toothed driving wheel.
  • a problem with the first prior art is that the rotation speed of the vacuum pump is the same as the speed of the driving shaft.
  • a problem with the second prior art is that the vacuum pump is constrained to occupy a predetermined space, inside or outside the engine, corresponding to a predetermined angle defined between the engine and the oil pump. Moreover such a prior art, having a rotor and a gear wheel made of metal, has a high moment of inertia.
  • the document JP S59 168292 discloses a pump whose driving means comprise a movable pinion that is disposed within a fixed and internally toothed hollow cylinder.
  • the present invention also concerns a method of operating a positive displacement pump.
  • the positive displacement pump includes a driven gear wheel and a driving gear wheel, coupled so as to form a gear train in which the gear wheels are placed one inside the other.
  • the driven and driving wheels have parallel axes and are cylindrical wheels with helical or straight teeth or bevel wheels.
  • the driven and driving wheels are bevel wheels with crossed axes (skew bevel wheels).
  • one of the driven and driving wheels has teeth formed on an outer surface and one of the driven and driving wheels has teeth formed on an inner surface, respectively.
  • this allows making gear trains with a reducing or multiplying gear ratio.
  • the pump can be arbitrarily located along a circumference centred on the rotation axis of the driving wheel.
  • a positive displacement pump 13 is, for instance, a rotary vacuum pump.
  • Positive displacement pump 13 in the exemplary embodiment, has a body 15 defining a chamber 16 with substantially elliptical cross-section, of known type, which in the example is a vacuum chamber, and a drive side 18 ( Figs. 1 and 2 ).
  • Vacuum chamber 16 in use is closed by a cover 17 ( Fig. 3 ).
  • a rotor 12 for instance a single-vane rotor, is housed within vacuum chamber 16.
  • the rotor could be a multi-vane rotor, a so-called "pendulum” rotor or a rotor of any other kind envisaged in the art.
  • Rotor 12 employed herein is preferably made of a lightweight material, for instance a plastic or thermoplastic material.
  • the movement of rotor 12 is preferably constrained by a guide 14 formed in pump body 15.
  • At least one outlet for a discharge duct 20 and at least one inlet for a suction duct 19 are formed in pump body 15 and communicate with chamber 16.
  • the rotor has, on drive side 18, teeth 11a arranged to form a gear wheel 11 that in the example is a driven wheel.
  • Wheel 11 referred to herein as driven wheel, is for instance a cylindrical wheel with helical teeth.
  • a shaft 10 forms a control (or drive) member for the pump.
  • drive member 10 is for instance a shaft of the engine, a cam shaft, a shaft of the alternator, an output shaft of an oil pump, and so on.
  • a gear wheel 10a for instance a cylindrical wheel with helical teeth, can be preferably formed at or connected to one end of shaft 10.
  • said wheel is made of metal and its teeth are designed for meshing with the teeth of driven wheel 11 thereby forming a gear train.
  • Wheel 10a may be for instance integrally formed with shaft 10 or it may be interference-keyed on shaft 10. Wheel 10a is therefore fixedly connected with shaft 10 and is defined herein as driving wheel.
  • driving wheel 10a fixedly connected with shaft 10
  • driven wheel 11 fixedly connected with rotor 12
  • gear train with parallel axes in which the driving wheel is placed inside the driven wheel ( Figs. 1 to 3 ).
  • the wheels could also be bevel wheels arranged to form a gear train with skew axes (in this case the whole of the two wheels is referred to as a bevel gear pair).
  • driven wheel 11 has greater size than driving wheel 10a, that is, driven wheel 11 has a radius r 2 greater than radius r 1 of driving wheel 10a.
  • driven wheel 11 has a number of teeth z 2 greater than the number of teeth z 1 of driving wheel 10a.
  • gear ratio R is therefore a reducing ratio (R > 1).
  • the driving wheel could be external to driven wheel 11 associated with the pump rotor.
  • the driven wheel will have external teeth in place of internal teeth.
  • gear ratio R is a multiplying ratio (R ⁇ 1) and allows the pump rotor to rotate at higher speed than the drive shaft.
  • rotation axis O 2 of driven wheel 11 can be arbitrarily located along a circumference C with radius r centred on rotation axis O 1 of driving wheel 10a.
  • gear trains with skew axes provides an additional degree of freedom with respect to the embodiment using gear trains with parallel axes.
  • Wheels 10a and 11 described above as cylindrical wheels with helical teeth and parallel axes, may have any shape known in the art, for instance they can be two straight-toothed cylindrical wheels with parallel axes, two bevel wheels with parallel or skew axes, etc.
  • helical gear trains with a suitably defined and oriented angle of the helix allows obtaining an axial thrust directed from the inside of pump 13 towards the drive side and aimed at balancing, or at least reducing, the axial thrust in the opposite direction due to the pressure difference, thereby reducing the greater friction generated by the latter.
  • a further positive displacement pump for instance an oil pump
  • a further positive displacement pump for instance an oil pump
  • Configurations of the above type in which two pumps are arranged downstream each other, are usually referred to as tandem pumps in the present technical field.
  • drive shaft 10 (and hence wheel 10a) rotates at a given angular speed ⁇ 1 , it transmits the rotary motion or torque to rotor 12 of pump 13, through the pair of driving wheel 10a and driven wheel 11.
  • the direction of rotation of single-vane rotor 12 when viewed from the drive side, is the counterclockwise direction.
  • Vane 12a of rotor 12 is forced against wall 16a of vacuum chamber 16 so as to ensure tightness with the same wall 16a.
  • the structure of the positive displacement pump and the corresponding operation method as described herein have several advantages.
  • the reducing gear ratio of the pair of driving wheel 10a and driven wheel 11 allows reducing in predetermined manner the rotation speed of rotor 12 of pump 13 relative to the speed of driving shaft 10.
  • pump 13 connected with a reducing gear ratio, has a pumping efficiency similar to that of a pump connected with a unit (“impartial") gear ratio - i.e. a ratio where the rotation speeds of the rotor and the driving shaft are the same - it is preferably useful to increase the displacement of pump 13.
  • impartial gear ratio i.e. a ratio where the rotation speeds of the rotor and the driving shaft are the same - it is preferably useful to increase the displacement of pump 13.
  • the Applicant has experimentally realised that a reducing gear ratio, and hence a reduction in the rotation speed of the rotor of a vacuum pump, allows reducing the power dissipated because of the friction, and hence the emission of exhaust gases (for instance CO 2 ) produced by an engine operating the pump drive shaft, even in case the pump displacement is increased.
  • the Applicant provides hereinbelow an example of approximate calculation of dissipated powers, assuming a vacuum pump where the reducing gear ratio is 2 (i.e. where the pump rotor rotates at half the speed of the drive shaft) and the displacement is twice the displacement of a reference pump having a unit gear ratio.
  • the Applicant has assumed that, in the average use of the motor vehicle, the pump operates for 10% of the operation time in order to restore a vacuum required by the braking system and for 90% of the operation time in order to maintain such a vacuum. In any case, this assumption has been confirmed by the practice.
  • the Applicant has realised that, due to the greater pump displacement, the power absorbed by the vacuum pump increases, during vacuum restoration, by about 50% relative to the power absorbed by the reference pump.
  • the Applicant has realised that, due to the lower rotation speed, the power absorbed by the vacuum pump during vacuum maintenance decreases by about 50% relative to the power absorbed by the reference pump, since, under such conditions, the power due to the torque, or resistant torque, associated with the pump rotor does not change as the number of revolutions of the pump changes.
  • the structure and the operation method of a pump using gear trains with parallel or skew axes, like the gear trains described above, offers the advantage of making installation of pump 13 easier, depending on the available space in a motor vehicle.
  • the driving wheel can for instance be exchanged with the driven wheel, i.e., the teeth of the driven wheel are formed on the external surface thereof and the teeth of the driving wheel are formed on the internal surface thereof.
  • a reducing or multiplying gear ratio is advantageous, for instance, in tandem configurations, in which a first positive displacement pump is arranged downstream a second positive displacement pump, while maintaining all advantages of installation simplicity and energy balance as described above.
  • Another advantage of the invention is the possibility of using a rotor made of a lightweight material, for instance a plastic or thermoplastic material, with a consequent reduction in the moment of inertia of the same rotor.
  • a further advantage results from the possibility of limiting, in the case of vacuum pumps, the axial thrust acting on rotor 12 because of the pressure difference between chamber 16 of pump 13 and the outside environment.
  • Such a skewing force is applied to the pump rotor and consequently to the guide thereof, passes through the centre of rotation of the rotor, is directed from a compression region to a suction region in the vacuum chamber and has an orientation that is rotated by about 20*, in the direction of rotation of the rotor, relative to the straight line passing through the rotor centre and the point of tangency between the rotor and the vacuum chamber.
  • a drive shaft configured in accordance with the present invention generates a radial thrust on the rotor, due to the drive of the same rotor, in such a direction as to space out the teeth of the driven wheel from the teeth of the driving wheel along a straight line passing through the respective centres of rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (6)

  1. Pompe volumétrique (13), comprenant :
    - un corps de pompe (15) définissant une chambre de pompe (16) et un côté d'entraînement (18),
    - un rotor (12) configuré pour transférer du fluide depuis au moins un premier environnement jusqu'à au moins un deuxième environnement à travers au moins une entrée pour un conduit d'aspiration (19) et au moins une sortie pour un conduit de décharge (20),
    - une roue menée (11) connectée fixement audit rotor (12) et une roue d'entraînement (10a) pouvant être connectée à un organe d'entraînement (10) et accouplée à ladite roue menée (11), ladite roue menée étant configurée pour faire tourner ledit rotor,
    ladite pompe volumétrique (13) étant caractérisée en ce que la roue d'entraînement (10a) est placée à l'intérieur de ladite roue menée (11), en ce que ladite roue d'entraînement (10a) présente des dents formées sur une surface extérieure de celle-ci et ladite roue menée (11) présente des dents formées sur une surface intérieure de celle-ci, et en ce que les dents de la roue menée (11) et les dents de la roue d'entraînement (10a) réalisent un rapport de démultiplication de manière à réduire la puissance dissipée au cours du fonctionnement de la pompe,
    le mouvement du rotor (12) étant limité par un guide (14) formé dans le corps de pompe (15), de telle sorte que la roue d'entraînement (10a) soit placée à l'extérieur du corps de pompe (15) et que la roue menée (11) soit placée sur le côté d'entraînement (18) du corps de pompe (15), faisant face vers l'extérieur du corps de pompe (15), de telle sorte que la pompe (13), en fonction de l'espace disponible, puisse être placée dans une pluralité de positions possibles le long d'une circonférence (C) centrée sur l'axe de rotation (O1) de la roue d'entraînement (10a), ladite circonférence (C) ayant un rayon égal à la distance entre un axe de rotation (O2) de la roue menée (11) et l'axe de rotation (O1) de la roue d'entraînement (10a).
  2. Pompe (13) selon la revendication 1, dans laquelle les roues menée et d'entraînement (10a, 11) sont agencées de manière à former un train d'engrenage et sont des roues d'engrenage ayant des axes parallèles et choisies dans le groupe comprenant :
    - des roues cylindriques avec des dents hélicoïdales ;
    - des roues cylindriques avec des dents droites ;
    - des roues coniques.
  3. Pompe (13) selon la revendication 1, dans laquelle la paire de roues menée et d'entraînement (10a, 11) comprenant des roues d'engrenage coniques ayant des axes obliques.
  4. Pompe (13) selon l'une quelconque des revendications précédentes, dans laquelle, parmi les points de la circonférence centrés sur l'axe de rotation (O1) de la roue d'entraînement (10a) sur lesquels il est possible de placer arbitrairement la pompe, la pompe (13) est placée de telle sorte qu'une force d'entraînement passant à travers le centre du rotor ait la même orientation et une direction opposée par rapport à une force oblique agissant sur le rotor lors de l'utilisation de la pompe.
  5. Pompe (13) selon l'une quelconque des revendications 1 à 4, dans laquelle le rotor (12) et/ou les roues d'entraînement et menée sont fabriqués à partir d'un matériau choisi dans le groupe comprenant :
    - un matériau plastique,
    - un matériau thermoplastique,
    - un matériau métallique,
    - un matériau composite.
  6. Procédé de fonctionnement d'une pompe volumétrique, comprenant les étapes suivantes :
    - fournir une roue d'entraînement (10a) placée à l'extérieur d'un corps de pompe (15) de la pompe volumétrique, ladite roue d'entraînement (10a) pouvant être raccordée à un organe d'entraînement (10) et ayant des dents formées sur une surface extérieure de celle-ci,
    - former, dans le corps de pompe (15), un guide (14) qui limite le mouvement du rotor (12),
    - fournir une roue menée (11) placée sur un côté d'entraînement (18) d'un corps de pompe (15) de la pompe volumétrique, faisant face vers l'extérieur du corps de pompe (15), ladite roue menée (11) étant raccordée à ladite roue d'entraînement (10a) et ayant des dents formées sur une surface intérieure de celle-ci, ladite roue d'entraînement (10a) étant placée à l'intérieur de ladite roue menée (11) et ayant un nombre de dents (z2) inférieur au nombre de dents (z1) de ladite roue menée (11), de manière à réaliser un rapport de démultiplication,
    - en fonction de l'espace disponible, placer la pompe volumétrique dans l'une parmi une pluralité de positions possibles le long d'une circonférence (C) centrée sur l'axe de rotation (O1) de la roue d'entraînement (10a), ladite circonférence (C) ayant un rayon (r) égal à la distance entre l'axe de rotation (O2) de la roue menée (11) et l'axe de rotation (O1) de la roue d'entraînement (10a), et
    - actionner lesdites roues d'entraînement et menée au moyen de l'organe d'entraînement afin de transférer du fluide depuis au moins un premier environnement jusqu'à au moins un deuxième environnement,
    la roue menée tournant à une plus faible vitesse de rotation que la vitesse de la roue d'entraînement de manière à réduire la puissance dissipée au cours du fonctionnement de la pompe.
EP14830724.2A 2013-12-30 2014-12-23 Pompe volumétrique et son procédé de fonctionnement Active EP3090183B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT001081A ITTO20131081A1 (it) 2013-12-30 2013-12-30 Pompa volumetrica e relativo metodo di comando
PCT/IB2014/067259 WO2015101902A1 (fr) 2013-12-30 2014-12-23 Pompe volumétrique et son procédé de fonctionnement

Publications (2)

Publication Number Publication Date
EP3090183A1 EP3090183A1 (fr) 2016-11-09
EP3090183B1 true EP3090183B1 (fr) 2021-04-07

Family

ID=50159450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14830724.2A Active EP3090183B1 (fr) 2013-12-30 2014-12-23 Pompe volumétrique et son procédé de fonctionnement

Country Status (3)

Country Link
EP (1) EP3090183B1 (fr)
IT (1) ITTO20131081A1 (fr)
WO (1) WO2015101902A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0235160B2 (ja) * 1983-03-14 1990-08-08 Nippon Jidosha Buhin Sogo Kenkyusho Kk Kaitenatsushukuki
JP2562598B2 (ja) * 1987-04-20 1996-12-11 トキコ株式会社 スクロ−ル式流体機械
EP1613862B1 (fr) 2003-04-16 2010-11-17 O.M.P. Officine Mazzocco Pagnoni S.r.l. Ensemble de pompes a huile et a vide pour un moteur de vehicule automobile
DE102004016237A1 (de) * 2004-04-02 2005-10-20 Leybold Vakuum Gmbh Zwei-Wellen-Vakuumpumpe
ITTO20110912A1 (it) 2011-10-13 2013-04-14 Vhit Spa Pompa per vuoto rotativa

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ITTO20131081A1 (it) 2015-07-01
EP3090183A1 (fr) 2016-11-09
WO2015101902A1 (fr) 2015-07-09

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