EP2430290B1 - Pompe à une seule palette - Google Patents
Pompe à une seule palette Download PDFInfo
- Publication number
- EP2430290B1 EP2430290B1 EP10732421.2A EP10732421A EP2430290B1 EP 2430290 B1 EP2430290 B1 EP 2430290B1 EP 10732421 A EP10732421 A EP 10732421A EP 2430290 B1 EP2430290 B1 EP 2430290B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- vane
- rotation axis
- rotation
- vacuum pump
- 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.)
- Active
Links
- 238000006073 displacement reaction Methods 0.000 description 14
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
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.
- 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.
- 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 vehicle engine.
- 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 O-O.
- a vane 12 is mounted on the rotor 14 and has opposite free ends 22, 24 which are in contact with a perimetric surface 11b of said chamber 20.
- the perimetric surface 11b has, in a plane perpendicular to the first rotation axis O-O, 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 O-O.
- the distance between the pivot axis P-P and the rotation axis O-O 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 O-O.
- the distance between the rotation axis O-O and 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) 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 11b 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 11b.
- 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 11b 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)
Claims (4)
- Pompe à palette unique (10), en particulier pour un moteur de véhicule automobile, comprenant :- un stator (11) dans lequel une chambre (20) est définie ;- un premier rotor (13) monté dans ladite chambre (20) et capable de tourner autour d'un premier axe de rotation (M-M) ;- une palette (12) montée de façon coulissante dans une rainure diamétrale (30) dudit premier rotor (13) et ayant une partie rectiligne (26) ayant une longueur prédéterminée (L) et des extrémités libres opposées (22, 24) en contact avec une surface périphérique (11b) de ladite chambre (20) ;
dans laquelle la pompe comprend un deuxième rotor (14) monté dans ladite chambre (20) et capable de tourner autour d'un deuxième axe de rotation (O-O) parallèle au premier axe de rotation (M-M), la palette (12) étant reliée de manière rotative au deuxième rotor (14) en correspondance de sa zone longitudinale centrale et étant capable de tourner autour d'un axe de pivotement (P-P) qui est parallèle au premier axe de rotation (M-M), caractérisée en ce que la distance entre le premier axe de rotation (M-M) et le deuxième axe de rotation (O-O) et entre l'axe de pivotement (P-P) et le deuxième axe de rotation (O-O) étant égale à un quart de la longueur prédéterminée (L) de la partie rectiligne (26) de la palette (12), la surface périphérique (11b) de ladite chambre (20) ayant, sur un plan perpendiculaire au premier axe de rotation (M-M), une forme de cardioïde laquelle coïncide sensiblement avec la cardioïde définie par les extrémités libres opposées (22, 24) de la palette (12) pendant la rotation du premier rotor (13) et du deuxième rotor (14). - Pompe à palette unique (10), selon la revendication 1, dans laquelle les extrémités libres opposées (22, 24) de la palette (12) sont définies sur des parties terminales opposées (27, 28) ayant une section sensiblement semi-circulaire avec un rayon prédéterminé (r).
- Pompe à palette unique (10) selon la revendication 1 ou 2, dans laquelle le premier rotor (13) et le deuxième rotor (14) sont sélectivement entrainables en rotation, le rotor entraîné en rotation traînant en rotation le rotor non entraîné.
- Pompe à palette unique (10) selon l'une quelconque des revendications précédentes, dans laquelle ladite pompe est une pompe à vide (10).
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 EP2430290A2 (fr) | 2012-03-21 |
EP2430290B1 true 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)
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 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2648872A1 (fr) * | 1989-06-24 | 1990-12-28 | Barmag Barmer Maschf | Pompe a palettes |
Family Cites Families (4)
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 |
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 |
-
2009
- 2009-05-13 IT ITMI2009A000821A patent/IT1399349B1/it active
-
2010
- 2010-05-12 EP EP10732421.2A patent/EP2430290B1/fr active Active
- 2010-05-12 WO PCT/IB2010/001097 patent/WO2010131103A2/fr active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2648872A1 (fr) * | 1989-06-24 | 1990-12-28 | Barmag Barmer Maschf | Pompe a palettes |
Also Published As
Publication number | Publication date |
---|---|
ITMI20090821A1 (it) | 2010-11-14 |
WO2010131103A2 (fr) | 2010-11-18 |
IT1399349B1 (it) | 2013-04-16 |
EP2430290A2 (fr) | 2012-03-21 |
WO2010131103A3 (fr) | 2011-03-17 |
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