EP2430290A2 - Pompe à une seule palette - Google Patents

Pompe à une seule palette

Info

Publication number
EP2430290A2
EP2430290A2 EP10732421A EP10732421A EP2430290A2 EP 2430290 A2 EP2430290 A2 EP 2430290A2 EP 10732421 A EP10732421 A EP 10732421A EP 10732421 A EP10732421 A EP 10732421A EP 2430290 A2 EP2430290 A2 EP 2430290A2
Authority
EP
European Patent Office
Prior art keywords
rotor
vane
axis
chamber
rotation
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
EP10732421A
Other languages
German (de)
English (en)
Other versions
EP2430290B1 (fr
Inventor
Carlo Pachetti
Giuseppe Lo Biundo
Alessandra De Rango
Angelo Pancotti
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.)
Omp - Officine Mazzocco Pagnoni Srl
O M P Officine Mazzocco Pagnoni Srl
Original Assignee
Omp - Officine Mazzocco Pagnoni Srl
O M P Officine Mazzocco Pagnoni Srl
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 Omp - Officine Mazzocco Pagnoni Srl, O M P Officine Mazzocco Pagnoni Srl filed Critical Omp - Officine Mazzocco Pagnoni Srl
Publication of EP2430290A2 publication Critical patent/EP2430290A2/fr
Application granted granted Critical
Publication of EP2430290B1 publication Critical patent/EP2430290B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0818—Vane tracking; control therefor
    • F01C21/0827—Vane tracking; control therefor by mechanical means
    • F01C21/0836—Vane tracking; control therefor by mechanical means comprising guiding means, e.g. cams, rollers

Definitions

  • the present invention relates to a single-vane pump.
  • the invention relates to a single-vane vacuum pump for a motor vehicle engine, such a vacuum pump being intended to create a predetermined depression for activating and operating specific devices provided in the motor vehicle, like for example the servo-brake of a brake system.
  • a single-vane vacuum pump generally comprises a stator, a chamber defined inside the stator, a rotor mounted inside the chamber and a vane mounted on a diametric groove of said rotor and free to slide in such a groove.
  • the rotor is mounted eccentrically in the chamber and it is tangent at one point to the perimetric surface of the chamber.
  • a perimetric surface has - in a plane perpendicular to the rotation axis of the rotor -a substantially elliptical shape.
  • the rotation of the rotor causes the vane to move in rotation around the rotation axis of the rotor and to translate inside the diametric groove, so that the opposite free ends of the vane are in slithering contact on the perimetric surface of the chamber, typically with a very high load factor.
  • the value of the load factor is high even with low values of the rotation speed of the rotor, due to the high value of the instantaneous working radius of the vane .
  • a single-vane vacuum pump configured in the way schematically described above has the drawback of not being very suitable for operating at high rotation speeds, because of the high wearing at the opposite free ends of the vane.
  • the reliability of the single- vane vacuum pump described above becomes critical when the rotor is made to rotate at a high rotation speed.
  • the Applicant has found that the aforementioned drawback occurs in particular in single-vane vacuum pumps in which the rotor is dragged directly by the drive shaft of the engine of the motor vehicle.
  • the technical problem at the basis of the present invention is that of overcoming, or at least minimising, the drawbacks mentioned above with reference to the prior art.
  • the present invention therefore, relates to a single-vane pump, in particular a vacuum pump for a motor vehicle engine, having the features recited in claim 1.
  • cardioid is used to indicate the mathematical curve described by a point of a circumference which rolls without slithering outside a second circumference having the same radius. Being R the radius of the circumference, the equation of the cardioid in polar coordinates (p, ⁇ ) is:
  • the Applicant has found that the single- vane pump according to the invention can be used without drawbacks in those applications in which the rotor is dragged at high rotation speeds, since the opposite free ends of the vane always remain tangent to the perimetric surface of the chamber without slithering on said surface. Consequently, the problem correlated to the wearing of the ends of the vanes is extremely reduced, this problem being on the contrary always present, to a greater or lesser extent depending on the specific solution which is implemented, in single-vane vacuum pumps of the prior art.
  • figure 1 is a schematic plan view from above of a single-vane vacuum pump according to the present invention, without an upper cover so as to show the chamber of the stator;
  • figure 2 is a top side schematic view of a section, taken at the plane II - II, of the vacuum pump of figure 1 provided with the aforementioned upper cover;
  • figure 3 is a schematic drawing of a segment AB the ends of which describe a cardioid
  • figure 4 is a schematic plan view from above of the single-vane vacuum pump of figure 1, wherein it is highlighted a comparison between the displacement of a single-vane vacuum pump according to the prior art (area with single broken line) and of the displacement of the vacuum pump according to the invention (area with a single broken line and area with a double broken line) ;
  • figure 5 is an exploded schematic perspective view of the single-vane vacuum pump of figure 1.
  • a single- vane vacuum pump in accordance with the invention is shown.
  • This pump is wholly ' indicated with reference number 1 and, in particular, it is suitable for being used in a motor - A -
  • the vacuum pump 10 comprises a stator 11 in which a chamber 20 is defined.
  • a rotor 14 is mounted in the chamber 20 and is capable of rotating around a first rotation axis 0-0.
  • a vane 12 is mounted on the rotor 14 and has opposite free ends 22, 24 which are in contact with a perimetric surface lib of said chamber 20.
  • the perimetric surface lib has, in a plane perpendicular to the first rotation axis 0-0, substantially the shape of a cardioid defined as described below.
  • the vane 12 comprises a rectilinear portion 26 having a predetermined length L (line A-B in figure 1) and opposite end portions 27, 28 having a substantially semi-circular section, with a predetermined radius r and respective centres in A and B.
  • the rectilinear portion 26 of the vane 12 has a thickness equal to twice the predetermined radius r of the portions 27, 28.
  • the vane 12 is rotatably connected to the rotor 14 at the longitudinal middle area thereof through a pin 15 which has a pivot axis P-P parallel to the rotation axis 0-0.
  • the distance between the pivot axis P-P and the rotation axis 0-0 defines an eccentricity equal to a fourth of the length L of the rectilinear portion 26 of the vane 12.
  • the vacuum pump 10 comprises a further rotor 13 also housed inside the chamber 20 and having a diametric groove 30 for the sliding of the vane 12.
  • the rotor 13 is capable of rotating around a rotation axis M-M parallel to the rotation axis 0-0. The distance between the rotation axis
  • the rotation axis M-M is equal to the aforementioned eccentricity, i.e. equal to a fourth of the length L of the rectilinear portion 26 of the vane 12.
  • the rotor 14 and the rotor 13 are selectively drivable in rotation.
  • the rotor that is driven in rotation drags in rotation the other rotor.
  • the kinematism of the single-vane vacuum pump 10 described above is schematised in figure 3.
  • the segment AB that corresponds to the rectilinear portion 26 of length L of the vane 12
  • the segment AB is hinged in the point P, at the middle of the segment AB, and is forced to slide inside a slide S (which corresponds to the diametric groove 30 of the rotor 13) rotating around M (corresponding to the rotation axis M-M of the rotor 13) .
  • the end portions 27, 28 with a substantially semi-circular section of the vane 12 correspond, in the schematic drawing of figure 3, to the two circumferences with radius r and centre A and B.
  • the points A and B describe the cardioid 11a
  • the aforementioned circumferences with radius r and centre A and B remain tangent, in all the points, to an outermost homothetic cardioid.
  • the peripheral surface lib of the chamber 20 of the vacuum pump 10 has the profile of this last homothetic cardioid.
  • Figure 1 indicates the cardioid 11a as well as the cardioid of the peripheral surface lib.
  • the two circumferences with radius r and centre A and B, during the rotation of the segment AB with the geometrical constraints indicated above with reference to figure 3, always remain tangent to a cardioid (indicated with lib in figure 1) that is obtained by homothetically translating the cardioid 11a by an amount equal to r, such an amount being taken on the perpendicular to the tangent in each point of the cardioid 11a.
  • the schematic drawing of the kinematism of figure 3 shows that, by imposing to the segment OP (which corresponds to the radius of the rotor 14 of the vacuum pump 10) a rotation speed of n revolutions, the slide S (which corresponds to the diametric groove 30 of the rotor 13 of the vacuum pump 10) is driven in rotation - through the segment AB - with a rotation speed equal to n/2.
  • the vane 12 generates - during its rotation - a variable volume having a predetermined displacement, in the case in which the motion is driven by the rotor 14, and having double displacement, in the case in which the motion is driven by the rotor 13.
  • the specific displacement (i.e. the displacement per unit of height) of the vacuum pump 10 according to the invention is greater by about 50% with respect to the specific displacement of a single-vane vacuum pump of the prior art having the same external overall dimension.
  • an important advantage of the vacuum pump of the invention is related to the fact that the second rotor 13 is extremely smaller with respect to the single rotor of the single-vane vacuum pump of the prior art, making available almost the entirety of the chamber of the vacuum pump for the displacement.
  • Another advantage of the vacuum pump of the invention is that, in operation, since the pin-vane peripheral slithering speed is extremely low (the diameter of the pin 15 is indeed very small) , all the dynamic loads are discharged onto the kinematic pair formed by the pin 15 and vane 12 with an extremely low load factor.
  • the vacuum pump of the invention can advantageously receive motion from either the rotor 14 and the rotor 13, generating the predetermined displacement or a double displacement, respectively, and therefore it is perfectly suitable for either application with a high number of revolutions and application with a low number of revolutions, by respectively taking the motion from the rotor 14 or from the rotor 13.
  • a further advantage of the vacuum pump of the invention is related to the fact that, having a specific displacement which is greater than that of conventional vacuum pumps, when the motion is provided by the second rotor 13, the vacuum pump can have a smaller overall dimension, being equal the displacement.

Landscapes

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

Abstract

L'invention porte sur une pompe à une seule palette, comprenant un stator (11), un premier rotor (13) monté dans la chambre (20) du stator et capable de tourner autour d'un axe (M-M), et une palette (12) montée à glissement dans une rainure diamétrale (30) du rotor (13) et ayant une partie rectiligne (26) de longueur prédéterminée (L) et des extrémités libres opposées (22, 24) en contact avec une surface périphérique (11b) de la chambre (20). Un second rotor (14) est monté dans la chambre (20) et est capable de tourner autour d'un axe (O-O) qui est parallèle à l'axe (M-M). La palette (12) est articulée sur le rotor (14), au niveau d'une zone centrale longitudinale de celle-ci, sur un axe (P-P) parallèle à l'axe (M-M). La distance entre l'axe (M-M) et l'axe (O-O) et entre l'axe (P-P) et l'axe (O-O) est égale au quart de la longueur (L) de la partie rectiligne (26) de la palette (12). La surface périmétrique (11b) de la chambre (20) a, dans un plan perpendiculaire à l'axe (M-M), une forme de cardioïde, qui coïncide avec la cardioïde définie par les extrémités (22, 24) de la palette (12) pendant la rotation des rotors (13, 14).
EP10732421.2A 2009-05-13 2010-05-12 Pompe à une seule palette Active EP2430290B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2009A000821A IT1399349B1 (it) 2009-05-13 2009-05-13 Pompa monopaletta
PCT/IB2010/001097 WO2010131103A2 (fr) 2009-05-13 2010-05-12 Pompe à une seule palette

Publications (2)

Publication Number Publication Date
EP2430290A2 true EP2430290A2 (fr) 2012-03-21
EP2430290B1 EP2430290B1 (fr) 2019-06-26

Family

ID=41460974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10732421.2A Active EP2430290B1 (fr) 2009-05-13 2010-05-12 Pompe à une seule palette

Country Status (3)

Country Link
EP (1) EP2430290B1 (fr)
IT (1) IT1399349B1 (fr)
WO (1) WO2010131103A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10087758B2 (en) 2013-06-05 2018-10-02 Rotoliptic Technologies Incorporated Rotary machine
EP3850189A4 (fr) 2018-09-11 2022-06-15 Rotoliptic Technologies Incorporated Étanchéité dans des machines rotatives trochoïdales hélicoïdales
US11815094B2 (en) 2020-03-10 2023-11-14 Rotoliptic Technologies Incorporated Fixed-eccentricity helical trochoidal rotary machines
US11802558B2 (en) 2020-12-30 2023-10-31 Rotoliptic Technologies Incorporated Axial load in helical trochoidal rotary machines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2047624A1 (de) * 1970-09-28 1972-05-18 Fa. Wilhelm Reich, 7900 Ulm Flügelzellenpumpe
EP0359139A3 (fr) * 1988-09-10 1990-06-06 Barmag Ag Pompe à palettes
IT1248957B (it) * 1989-06-24 1995-02-11 Barmag Barmer Maschf Pompa ad alette e celle
GB2332481B (en) * 1997-12-16 2002-06-05 James Wayne Hyland A heart-shaped pump
DE112008002681A5 (de) * 2007-10-24 2010-11-04 Ixetic Hückeswagen Gmbh Vakuumpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010131103A2 *

Also Published As

Publication number Publication date
ITMI20090821A1 (it) 2010-11-14
WO2010131103A2 (fr) 2010-11-18
IT1399349B1 (it) 2013-04-16
EP2430290B1 (fr) 2019-06-26
WO2010131103A3 (fr) 2011-03-17

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