EP1055070B1 - Low noise high performance vacuum pump - Google Patents
Low noise high performance vacuum pump Download PDFInfo
- Publication number
- EP1055070B1 EP1055070B1 EP99902628A EP99902628A EP1055070B1 EP 1055070 B1 EP1055070 B1 EP 1055070B1 EP 99902628 A EP99902628 A EP 99902628A EP 99902628 A EP99902628 A EP 99902628A EP 1055070 B1 EP1055070 B1 EP 1055070B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- movements
- vacuum pump
- main axis
- pistons
- 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.)
- Expired - Lifetime
Links
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method 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
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/02—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders arranged oppositely relative to main shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/0404—Details, component parts specially adapted for such pumps
- F04B27/0414—Cams
Definitions
- the present invention relates to a vacuum pump comprising first and second cylinders of the same diameter in which respective first and second pistons, each of which is moved by an eccentric, delimit respective first and second volumes, each cylinder being with an inlet with a suction check valve and an outlet with a check valve backflow preventer.
- a similar pump is known from US 4,679,994.
- Vacuum pumps of this type which were widely used in industry before the generalization of rotary pumps, have the advantage of being able to constitute pumps dry, requiring no lubrication.
- US patent 2579927 describes a compressor whose pistons work in phase. However, an imbalance between the piston strokes causes undesirable vibrations.
- Japanese patent JP 58067978 describes a compressor with reduced noise level comprising at least minus a pair of pistons mounted symmetrically with respect to the main axis formed by the piston drive axis, but reduced efficiency since the movements suction and delivery of the pistons are the same duration.
- the invention is situated in this context and aims to propose a vacuum pump less generator of vibrations than known pumps and nevertheless having a yield superior.
- the vacuum pump of the invention is essentially characterized in that the cylinders are aligned with each other and arranged symmetrically with respect to a main axis, in that the pistons are simultaneously animated by respective suction movements, symmetrical with respect to the main axis, and for which the first and second volumes grow, and repression movements respective, symmetrical with respect to the main axis, and for which the first and second volumes decrease, and in that the suction and discharge movements have first and second respective durations of which the first is greater than the second.
- each eccentric is produced in the form of a guide on the same cam animated by a movement of uniform rotation around the main axis and accepting this main axis as the axis of even order symmetry, that the suction movements of the pistons result from a rotation of first angular amplitude of the cam, as the displacement movements of the pistons result from a rotation of second angular amplitude of the cam, and that the first angular amplitude is greater than the second angular amplitude.
- the cam can be shaped into a closed curve of order 2 axial symmetry, having a radial dimension of minimum length and a radial dimension of length maximum making between them angles different from 90 degrees.
- angles formed between the radial dimensions of lengths minimum and maximum of the cam have a minimum value at least equal to 70 degrees and a maximum value at most equal to 110 degrees.
- the cam can have a shape derived from an ellipse by anamorphosis or on the contrary present, parallel to its radial dimension of minimum length, a width intermediate greater than the radial dimension of minimum length and less than the radial dimension of maximum length.
- the vacuum pump of the invention comprises, in a known manner, first and second cylinders 1 and 2, of the same diameter D, in which respective first and second pistons 3 and 4 slide tightly.
- Each cylinder 1, 2 is provided with an inlet 11, 21 on which a non-return valve is installed suction 13, 23 and an outlet 12, 22 on which is installed a non-return valve repression 14, 24.
- the inputs 11, 21 are connected to an enclosure 6 which the pump must empty of its gas, and the outputs 12, 22 for example discharge into the atmosphere.
- the first and second pistons 3, 4 are driven by respective eccentrics 51, 52, and delimit respective first and second volumes V1, V2 in cylinders 1 and 2.
- the cylinders 1, 2 are aligned with each other and are arranged symmetrically with respect to a main axis X, which is perpendicular to the plane of the FIGS.
- Each of the pistons 3, 4 is alternately driven by a suction movement such as MA1 and MA2, for which the first and second volumes V1, V2 grow, and with a movement of repression such as MR1 and MR2, for which the first and second volumes V1, V2 decrease.
- suction and delivery movements MA1, MA2 and MR1, MR2 have first and second respective durations different t1, t2, each suction movement MA1, MA2 having a duration t1 greater than the duration t2 of each delivery movement MR1 and MR2.
- each eccentric 51, 52 is produced in the form of a guide on the same cam 5, which is rotated uniform around the main axis X.
- each piston 3, 4 can, for example, be obtained by pressing on the profile of the cam 5 a roller such as 31, 41 secured to this piston in translation, by means of springs such that 7 and 8 working either in compression or in traction as is the case for the realization illustrated in figure 1.
- Cam 5 which rotates around the X axis, also accepts this axis as the axis of symmetry even order, that is to say that the profile of this cam is invariant for a rotation of 2 x PI / N radians around the X axis, N being an even integer.
- the suction movements MA1, MA2 of pistons 3, 4 result from a rotation of first angular amplitude A1 of the cam 5, while the displacement movements MR1, MR2 of the pistons 3, 4 result from a rotation of second angular amplitude A2 of cam 5, the first angular amplitude A1 being greater than the second angular amplitude A2.
- the cam 5 which is in this case conformed to a closed curve of axial symmetry of order 2, has a radial dimension of minimum length L1 and a radial dimension of maximum length L2 making between they have angles A1, A2 other than 90 degrees.
- the cam 5 is completely covered by a circle centered on the axis X and of diameter L2, and completely covers a circle centered on the X axis and of diameter L1, the tangents T1 and T2 or T1 'and T2' to these circles, which are also tangents to the cam, making between them complementary angles A1 and A2, the first of which, A1, is greater than the second, A2.
- the angle A1 is at most equal to 110 degrees, the angle A2 therefore being at least equal to 70 degrees.
- Cam 5 can, as shown in FIG. 3, have a shape obtained by anamorphosis of an ellipse.
- a cam as illustrated in FIG. 2, and which has, parallel to its dimension radial of minimum length L1, an intermediate width L3 greater than the dimension radial of minimum length L1 and less than the radial dimension of maximum length L2.
Description
La présente invention concerne une pompe à vide comprenant des premier et second cylindres de même diamètre dans lesquels des premier et second pistons respectifs, dont chacun est mû par un excentrique, délimitent des premier et second volumes respectifs, chaque cylindre étant muni d'une entrée dotée d'un clapet anti-retour d'aspiration et d'une sortie dotée d'un clapet anti-retour de refoulement. Une pompe similaire est connue du US 4 679 994.The present invention relates to a vacuum pump comprising first and second cylinders of the same diameter in which respective first and second pistons, each of which is moved by an eccentric, delimit respective first and second volumes, each cylinder being with an inlet with a suction check valve and an outlet with a check valve backflow preventer. A similar pump is known from US 4,679,994.
Les pompes à vide de ce type, qui ont été largement utilisées dans l'industrie avant la généralisation des pompes rotatives, présentent l'avantage de pouvoir constituer des pompes sèches, ne requérant aucune lubrification.Vacuum pumps of this type, which were widely used in industry before the generalization of rotary pumps, have the advantage of being able to constitute pumps dry, requiring no lubrication.
En revanche, ces pompes sont classiquement conçues de façon telle que les pistons travaillent en opposition de phase, c'est-à-dire que la somme instantanée des volumes définis par les pistons dans les cylindres reste à peu près constante.However, these pumps are conventionally designed in such a way that the pistons work in phase opposition, that is to say that the instantaneous sum of the volumes defined by the pistons in the cylinders remains roughly constant.
Or, non seulement ce mode de fonctionnement fait apparaítre des vibrations indésirables, dues aux masses alternatives en mouvement, difficiles à équilibrer, mais il gêne en outre l'utilisation d'excentriques optimisés, qui augmenteraient les difficultés d'équilibrage.However, not only does this mode of operation reveal undesirable vibrations, due to alternating moving masses, difficult to balance, but it also annoys the use of optimized eccentrics, which would increase the difficulties of balancing.
Le brevet US 2579927 décrit un compresseur dont les pistons travaillent en phase. Cependant, un déséquilibre entre les courses des pistons provoque des vibrations indésirables.US patent 2579927 describes a compressor whose pistons work in phase. However, an imbalance between the piston strokes causes undesirable vibrations.
Le brevet japonais JP 58067978 décrit un compresseur à niveau de bruit réduit comportant au moins une paire de pistons montés de manière symétrique par rapport à l'axe principal formé par l'axe d'entraínement des pistons, mais de rendement réduit puisque les mouvements d'aspiration et de refoulement des pistons sont de même durée.Japanese patent JP 58067978 describes a compressor with reduced noise level comprising at least minus a pair of pistons mounted symmetrically with respect to the main axis formed by the piston drive axis, but reduced efficiency since the movements suction and delivery of the pistons are the same duration.
L'invention se situe dans ce contexte et a pour but de proposer une pompe à vide moins génératrice de vibrations que les pompes connues et présentant néanmoins un rendement supérieur.The invention is situated in this context and aims to propose a vacuum pump less generator of vibrations than known pumps and nevertheless having a yield superior.
A cette fin, la pompe à vide de l'invention, par ailleurs conforme au préambule ci-dessus, est essentiellement caractérisée en ce que les cylindres sont alignés l'un avec l'autre et disposés symétriquement par rapport à un axe principal, en ce que les pistons sont simultanément animés de mouvements d'aspiration respectifs, symétriques par rapport à l'axe principal, et pour lesquels les premier et second volumes croissent, et de mouvements de refoulement respectifs, symétriques par rapport à l'axe principal, et pour lesquels les premier et second volumes décroissent, et en ce que les mouvements d'aspiration et de refoulement ont des première et seconde durées respectives dont la première est supérieure à la seconde.To this end, the vacuum pump of the invention, furthermore in accordance with the preamble above, is essentially characterized in that the cylinders are aligned with each other and arranged symmetrically with respect to a main axis, in that the pistons are simultaneously animated by respective suction movements, symmetrical with respect to the main axis, and for which the first and second volumes grow, and repression movements respective, symmetrical with respect to the main axis, and for which the first and second volumes decrease, and in that the suction and discharge movements have first and second respective durations of which the first is greater than the second.
Ces caractéristiques, qui optimisent le processus d'aspiration sans déséquilibrer les charges en mouvement, permettent d'améliorer le rendement de la pompe sans apparition de vibrations gênantes. These characteristics, which optimize the suction process without unbalancing the loads by movement, improve pump efficiency without the appearance of vibrations embarrassing.
Selon un mode de réalisation avantageux de l'invention, il est possible de prévoir que chaque excentrique soit réalisé sous forme d'un guidage sur une même came animée d'un mouvement de rotation uniforme autour de l'axe principal et acceptant cet axe principal comme axe de symétrie d'ordre pair, que les mouvements d'aspiration des pistons résultent d'une rotation de première amplitude angulaire de la came, que les mouvements de refoulement des pistons résultent d'une rotation de seconde amplitude angulaire de la came, et que la première amplitude angulaire soit supérieure à la seconde amplitude angulaire.According to an advantageous embodiment of the invention, it is possible to provide that each eccentric is produced in the form of a guide on the same cam animated by a movement of uniform rotation around the main axis and accepting this main axis as the axis of even order symmetry, that the suction movements of the pistons result from a rotation of first angular amplitude of the cam, as the displacement movements of the pistons result from a rotation of second angular amplitude of the cam, and that the first angular amplitude is greater than the second angular amplitude.
Par exemple, la came peut être conformée en une courbe fermée de symétrie axiale d'ordre 2, présentant une dimension radiale de longueur minimale et une dimension radiale de longueur maximale faisant entre elles des angles différents de 90 degrés.For example, the cam can be shaped into a closed curve of order 2 axial symmetry, having a radial dimension of minimum length and a radial dimension of length maximum making between them angles different from 90 degrees.
Dans ce cas, il est préférable que les angles formés entre les dimensions radiales de longueurs minimale et maximale de la came aient une valeur minimale au moins égale à 70 degrés et une valeur maximale au plus égale à 110 degrés.In this case, it is preferable that the angles formed between the radial dimensions of lengths minimum and maximum of the cam have a minimum value at least equal to 70 degrees and a maximum value at most equal to 110 degrees.
La came peut avoir une forme dérivée d'une ellipse par anamorphose ou au contraire présenter, parallèlement à sa dimension radiale de longueur minimale, une largeur intermédiaire supérieure à la dimension radiale de longueur minimale et inférieure à la dimension radiale de longueur maximale.The cam can have a shape derived from an ellipse by anamorphosis or on the contrary present, parallel to its radial dimension of minimum length, a width intermediate greater than the radial dimension of minimum length and less than the radial dimension of maximum length.
D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :
- la Figure 1 est une vue schématique d'une pompe à vide selon l'invention;
- la Figure 2 est une vue schématique d'une première came utilisable dans une pompe à vide selon l'invention; et
- la Figure 3 est une vue schématique d'une seconde came utilisable dans une pompe à vide selon l'invention.
- Figure 1 is a schematic view of a vacuum pump according to the invention;
- Figure 2 is a schematic view of a first cam usable in a vacuum pump according to the invention; and
- Figure 3 is a schematic view of a second cam usable in a vacuum pump according to the invention.
La pompe à vide de l'invention comprend, de façon connue, des premier et second cylindres 1
et 2, de même diamètre D, dans lesquels des premier et second pistons respectifs 3 et 4
coulissent de façon étanche.The vacuum pump of the invention comprises, in a known manner, first and second cylinders 1
and 2, of the same diameter D, in which respective first and
Chaque cylindre 1, 2 est muni d'une entrée 11, 21 sur laquelle est installé un clapet anti-retour
d'aspiration 13, 23 et d'une sortie 12, 22 sur laquelle est installé un clapet anti-retour de
refoulement 14, 24.Each cylinder 1, 2 is provided with an
Les entrées 11, 21 sont reliées à une enceinte 6 que la pompe doit vider de son gaz, et les
sorties 12, 22 refoulent par exemple dans l'atmosphère.The
Les premier et second pistons 3, 4 sont mus par des excentriques respectifs 51, 52, et
délimitent des premier et second volumes respectifs V1, V2 dans les cylindres 1 et 2. The first and
Selon l'invention, les cylindres 1, 2 sont alignés l'un avec l'autre et sont disposés symétriquement par rapport à un axe principal X, lequel est perpendiculaire au plan des figures.According to the invention, the cylinders 1, 2 are aligned with each other and are arranged symmetrically with respect to a main axis X, which is perpendicular to the plane of the FIGS.
Chacun des pistons 3, 4 est alternativement animé d'un mouvement d'aspiration tel que MA1
et MA2, pour lequel les premier et second volumes V1, V2 croissent, et d'un mouvement de
refoulement tel que MR1 et MR2, pour lequel les premier et second volumes V1, V2
décroissent.Each of the
Cependant, les mouvements d'aspiration respectifs MA1, MA2 des premier et second pistons
3 et 4 se produisent de façon à la fois simultanée pour ces deux pistons 3, 4, et symétrique par
rapport à l'axe principal X.However, the respective suction movements MA1, MA2 of the first and
De même, les mouvements de refoulement respectifs MR1, MR2 des premier et second
pistons 3 et 4 se produisent de façon à la fois simultanée pour ces deux pistons 3, 4, et
symétrique par rapport à l'axe principal X.Similarly, the respective delivery movements MR1, MR2 of the first and
En outre, les mouvements d'aspiration et de refoulement MA1, MA2 et MR1, MR2 ont des première et seconde durées respectives différentes t1, t2, chaque mouvement d'aspiration MA1, MA2 ayant une durée t1 supérieure à la durée t2 de chaque mouvement de refoulement MR1 et MR2.In addition, the suction and delivery movements MA1, MA2 and MR1, MR2 have first and second respective durations different t1, t2, each suction movement MA1, MA2 having a duration t1 greater than the duration t2 of each delivery movement MR1 and MR2.
Dans le mode de réalisation préféré illustré à la figure 1, chaque excentrique 51, 52 est réalisé
sous forme d'un guidage sur une même came 5, qui est animée d'un mouvement de rotation
uniforme autour de l'axe principal X.In the preferred embodiment illustrated in FIG. 1, each eccentric 51, 52 is produced
in the form of a guide on the
Le guidage de chaque piston 3, 4 peut, par exemple, être obtenu en appuyant sur le profil de la
came 5 un galet tel que 31, 41 solidaire de ce piston en translation, au moyen de ressorts tels
que 7 et 8 travaillant soit en compression, soit en traction comme c'est la cas pour le mode de
réalisation illustré à la figure 1.The guidance of each
La came 5, qui tourne autour de l'axe X, accepte également cet axe comme axe de symétrie
d'ordre pair, c'est-à-dire que le profil de cette came est invariant pour une rotation de 2 x PI/N
radians autour de l'axe X, N étant un nombre entier pair.
Plus précisément, dans le mode de réalisation illustré, les mouvements d'aspiration MA1,
MA2 des pistons 3, 4 résultent d'une rotation de première amplitude angulaire A1 de la came
5, alors que les mouvements de refoulement MR1, MR2 des pistons 3, 4 résultent d'une
rotation de seconde amplitude angulaire A2 de la came 5, la première amplitude angulaire A1
étant supérieure à la seconde amplitude angulaire A2.More specifically, in the illustrated embodiment, the suction movements MA1,
MA2 of
Pour ce faire, comme le montrent les figures 2 et 3, la came 5, qui est en l'occurrence
conformée en une courbe fermée de symétrie axiale d'ordre 2, présente une dimension radiale
de longueur minimale L1 et une dimension radiale de longueur maximale L2 faisant entre
elles des angles A1, A2 différents de 90 degrés. To do this, as shown in Figures 2 and 3, the
Autrement dit, la came 5 est totalement recouverte par un cercle centré sur l'axe X et de
diamètre L2, et recouvre totalement un cercle centré sur l'axe X et de diamètre L1, les
tangentes T1 et T2 ou T1' et T2' à ces cercles, qui sont aussi des tangentes à la came, faisant
entre elles des angles A1 et A2 complémentaires dont le premier, A1, est supérieur au second,
A2.In other words, the
De préférence, l'angle A1 est au plus égal à 110 degrés, l'angle A2 étant donc au moins égal à 70 degrés.Preferably, the angle A1 is at most equal to 110 degrees, the angle A2 therefore being at least equal to 70 degrees.
La came 5 peut, comme le montre la figure 3, présenter une forme obtenue par anamorphose
d'une ellipse.
Cependant, il peut être préférable, pour réduire les accélérations transmises aux pistons 3 et 4,
d'utiliser une came telle qu'illustrée à la figure 2, et qui présente, parallèlement à sa dimension
radiale de longueur minimale L1, une largeur intermédiaire L3 supérieure à la dimension
radiale de longueur minimale L1 et inférieure à la dimension radiale de longueur maximale
L2.However, it may be preferable, to reduce the accelerations transmitted to the
Claims (5)
- Vacuum pump comprising a first and a second cylinder (1, 2) of the same diameter (D), in which a respective first and second piston (3, 4), each of which is moved by an eccentric (51, 52), delimit a first and a second respective volume (V1, V2), each cylinder being equipped with an inlet (11, 21) fitted with a non-return intake valve (13, 23) and an outlet (12, 22) fitted with a non-return delivery valve (14, 24), characterized in that the cylinders (1, 2) are aligned with one another and arranged symmetrically with respect to a main axis (X), in that the pistons (3, 4) are simultaneously driven with respective intake movements (MA1, MA2) which are symmetric with respect to the main axis (X), and for which movements the first and second volumes (V1, V2) increase, and with respective delivery movements (MR1, MR2) which are symmetric with respect to the main axis (X) and for which movements the first and second volumes (V1, V2) decrease, and in that the intake and delivery movements (MA1, MA2, MR1, MR2) have a first and a second respective duration (t1, t2), the first (t1) of which is greater than the second (t2).
- Vacuum pump according to Claim 1, characterized in that each eccentric (51, 52) is produced in the form of a guide on one and the same cam (5) driven with a uniform rotational movement about the main axis (X) and accepting this main axis as an even-order axis of symmetry, and in that the intake movements (MA1, MA2) of the pistons (3, 4) result from a rotation of the cam (5) through a first angular amplitude (A1), in that the delivery movements (MR1, MR2) of the pistons (3, 4) result from a rotation of the cam (5) through a second angular amplitude (A2), and in that the first angular amplitude (A1) is greater than the second angular amplitude (A2).
- Vacuum pump according to Claim 2, characterized in that the cam (5) is shaped as a closed curve of 2nd-order axial symmetry, having a radial dimension of minimum length (L1) and a radial dimension of maximum length (L2) which make between them angles (A1, A2) other than 90 degrees.
- Vacuum pump according to Claim 3, characterized in that the angles (A1, A2) formed between the radial dimensions of minimum length and of maximum length (L1, L2) of the cam (5) have a minimum value at least equal to 70 degrees and a maximum value at most equal to 110 degrees.
- Vacuum pump according to Claim 2 or 3, characterized in that the cam (5) has, parallel to its radial dimension of minimum length (L1), an intermediate length (L3) which is greater than the radial dimension of minimum length (L1) and less than the radial dimension of maximum length (L2).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9801664A FR2774727B1 (en) | 1998-02-12 | 1998-02-12 | LOW NOISE AND HIGH EFFICIENCY VACUUM PUMP |
| FR9801664 | 1998-02-12 | ||
| PCT/FR1999/000284 WO1999041501A1 (en) | 1998-02-12 | 1999-02-08 | Low noise high performance vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1055070A1 EP1055070A1 (en) | 2000-11-29 |
| EP1055070B1 true EP1055070B1 (en) | 2002-12-04 |
Family
ID=9522880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99902628A Expired - Lifetime EP1055070B1 (en) | 1998-02-12 | 1999-02-08 | Low noise high performance vacuum pump |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1055070B1 (en) |
| JP (1) | JP4172005B2 (en) |
| DE (1) | DE69904299T2 (en) |
| ES (1) | ES2189384T3 (en) |
| FR (1) | FR2774727B1 (en) |
| WO (1) | WO1999041501A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345582A (en) * | 2011-10-10 | 2012-02-08 | 中国人民解放军第四军医大学 | Horizontally opposed dual-cylinder vacuum pump |
| CN102094776B (en) * | 2009-12-09 | 2015-03-11 | 上海汽车制动系统有限公司 | Oppositely arranged swing piston type vacuum pump used for automobiles |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008061311A1 (en) * | 2008-12-11 | 2010-06-24 | Doukas Ag | Device for conveying a gas |
| CN109595137B (en) * | 2018-12-20 | 2020-03-27 | 杨爱钗 | Negative pressure steam generating device |
| KR102420248B1 (en) * | 2020-08-05 | 2022-07-13 | 이준재 | Vacuum pump |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2579927A (en) * | 1947-05-17 | 1951-12-25 | Joho Olga | Opposed cylinder air compressor |
| US3834840A (en) * | 1972-06-07 | 1974-09-10 | E Hartley | Compact reciprocating piston machine |
| US4105371A (en) * | 1976-10-15 | 1978-08-08 | General Motors Corporation | Cam driven compressor |
| US4679994A (en) * | 1981-03-09 | 1987-07-14 | Allied Corporation | Piston vacuum pump |
| JPS5867978A (en) * | 1981-10-16 | 1983-04-22 | Nippon Denso Co Ltd | Reciprocating compressor |
| US5482443A (en) * | 1992-12-21 | 1996-01-09 | Commonwealth Scientific And Industrial Research Organization | Multistage vacuum pump |
-
1998
- 1998-02-12 FR FR9801664A patent/FR2774727B1/en not_active Expired - Fee Related
-
1999
- 1999-02-08 WO PCT/FR1999/000284 patent/WO1999041501A1/en active IP Right Grant
- 1999-02-08 DE DE69904299T patent/DE69904299T2/en not_active Expired - Fee Related
- 1999-02-08 ES ES99902628T patent/ES2189384T3/en not_active Expired - Lifetime
- 1999-02-08 JP JP2000531666A patent/JP4172005B2/en not_active Expired - Fee Related
- 1999-02-08 EP EP99902628A patent/EP1055070B1/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094776B (en) * | 2009-12-09 | 2015-03-11 | 上海汽车制动系统有限公司 | Oppositely arranged swing piston type vacuum pump used for automobiles |
| CN102345582A (en) * | 2011-10-10 | 2012-02-08 | 中国人民解放军第四军医大学 | Horizontally opposed dual-cylinder vacuum pump |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2774727A1 (en) | 1999-08-13 |
| EP1055070A1 (en) | 2000-11-29 |
| WO1999041501A1 (en) | 1999-08-19 |
| FR2774727B1 (en) | 2000-04-21 |
| DE69904299T2 (en) | 2003-08-21 |
| ES2189384T3 (en) | 2003-07-01 |
| JP2002503786A (en) | 2002-02-05 |
| JP4172005B2 (en) | 2008-10-29 |
| DE69904299D1 (en) | 2003-01-16 |
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