EP1055070A1 - Pompe a vide a faible bruit et rendement eleve - Google Patents
Pompe a vide a faible bruit et rendement eleveInfo
- Publication number
- EP1055070A1 EP1055070A1 EP99902628A EP99902628A EP1055070A1 EP 1055070 A1 EP1055070 A1 EP 1055070A1 EP 99902628 A EP99902628 A EP 99902628A EP 99902628 A EP99902628 A EP 99902628A EP 1055070 A1 EP1055070 A1 EP 1055070A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- vacuum pump
- pistons
- main axis
- movements
- 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
Links
- 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
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 driven by an eccentric, delimit respective first and second volumes, each cylinder being provided with an inlet with a suction check valve and an outlet with a discharge check valve.
- Vacuum pumps of this type which were used in industry before the generalization of rotary pumps, have the advantage of being able to constitute dry pumps, requiring no lubrication.
- 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 approximately constant.
- the invention is situated in this context and aims to propose a vacuum pump which generates less vibration than known pumps and which nevertheless has higher efficiency.
- 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 driven by respective suction movements, symmetrical with respect to the main axis, and for which the first and second volumes increase, and by respective discharge movements, 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, the first of which is greater than the second.
- each eccentric is produced in the form of a guide on the same cam having a uniform rotational movement around the main axis and accepting this main axis as an axis of symmetry of an even order, that the suction movements of the pistons result from a rotation of first angular amplitude of the cam, that the delivery 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 conformed to a closed curve of axial symmetry of order 2, having a radial dimension of minimum length and a radial dimension of maximum length making between them angles different from 90 degrees.
- angles formed between the radial dimensions of minimum and maximum length 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, have, parallel to its radial dimension of minimum length, an intermediate width greater than the radial dimension of minimum length and less than the radial dimension of maximum length.
- FIG. 1 is a schematic view of a vacuum pump according to the invention.
- FIG. 2 is a schematic view of a first cam usable in a vacuum pump according to the invention.
- FIG. 3 is a schematic view of a second cam usable in a vacuum pump according to the invention.
- 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 in sealed manner.
- Each cylinder 1, 2 is provided with an inlet 11, 21 on which a suction non-return valve 13, 23 is installed and with an outlet 12, 22 on which is installed a discharge non-return valve 14, 24.
- the inputs 11, 21 are connected to an enclosure 6 that the pump must empty of its gas, and the outputs 12, 22 discharge for example into the atmosphere.
- the first and second pistons 3, 4 are driven by respective eccentrics 51, 52, and delimit respective first and second volumes NI, N2 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 figures.
- Each of the pistons 3, 4 is alternately driven by a suction movement such as MAI and MA2, for which the first and second volumes NI, N2 increase, and by a discharge movement such as MR1 and MR2, for which the first and second volumes NI, N2 decrease.
- suction and delivery movements MAI, MA2 and MR1, MR2 have respective first and second durations different tl, t2, each suction movement MAI, MA2 having a duration tl greater than the duration t2 of each movement discharge MRl and MR2.
- each eccentric 51, 52 is produced in the form of a guide on the same cam 5, which is driven in a uniform rotational movement 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 as 7 and 8 working either compression, or in tension as is the case for the embodiment illustrated in FIG. 1.
- Cam 5 which rotates around the X axis, also accepts this axis as an axis of even order symmetry, i.e. 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 MAI, MA2 of the pistons 3, 4 result from a rotation of first angular amplitude Al of the cam 5, while the delivery movements MR1, MR2 of the pistons 3 , 4 result from a rotation of second angular amplitude A2 of the cam 5, the first angular amplitude A1 being greater than the second angular amplitude A2.
- the cam 5 which in this case is shaped in a closed curve of axial symmetry of order 2, has a radial dimension of minimum length L1 and a radial dimension of length maximum L2 making between them angles Al, A2 different from 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 axis X and of diameter Ll, the tangents Tl and T2 or Tl 'and T2' to these circles, which are also tangents to the cam, making between them complementary angles A1 and A2, the first of which, Al, is greater than the second,
- the angle Al is at most equal to 110 degrees, the angle A2 therefore being at least equal to 70 degrees.
- the cam 5 can, as shown in FIG. 3, have a shape obtained by anamorphosis of an ellipse. However, it may be preferable, to reduce the accelerations transmitted to the pistons 3 and 4, to use a cam as illustrated in FIG. 2, and which has, parallel to its radial dimension of minimum length L1, an intermediate width L3 greater than the radial dimension of minimum length L1 and less than the radial dimension of maximum length L2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9801664 | 1998-02-12 | ||
FR9801664A FR2774727B1 (fr) | 1998-02-12 | 1998-02-12 | Pompe a vide a faible bruit et rendement eleve |
PCT/FR1999/000284 WO1999041501A1 (fr) | 1998-02-12 | 1999-02-08 | Pompe a vide a faible bruit et rendement eleve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1055070A1 true EP1055070A1 (fr) | 2000-11-29 |
EP1055070B1 EP1055070B1 (fr) | 2002-12-04 |
Family
ID=9522880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99902628A Expired - Lifetime EP1055070B1 (fr) | 1998-02-12 | 1999-02-08 | Pompe a vide a faible bruit et rendement eleve |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1055070B1 (fr) |
JP (1) | JP4172005B2 (fr) |
DE (1) | DE69904299T2 (fr) |
ES (1) | ES2189384T3 (fr) |
FR (1) | FR2774727B1 (fr) |
WO (1) | WO1999041501A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008061311A1 (de) * | 2008-12-11 | 2010-06-24 | Doukas Ag | Vorrichtung zum Fördern eines Gases |
CN102094776B (zh) * | 2009-12-09 | 2015-03-11 | 上海汽车制动系统有限公司 | 汽车用对置摇摆活塞式真空泵 |
CN102345582A (zh) * | 2011-10-10 | 2012-02-08 | 中国人民解放军第四军医大学 | 水平对置双气缸真空泵 |
CN109595137B (zh) * | 2018-12-20 | 2020-03-27 | 杨爱钗 | 一种负压蒸汽发生装置 |
KR102420248B1 (ko) * | 2020-08-05 | 2022-07-13 | 이준재 | 진공펌프 |
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 (ja) * | 1981-10-16 | 1983-04-22 | Nippon Denso Co Ltd | 往復動圧縮機 |
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/fr not_active Expired - Fee Related
-
1999
- 1999-02-08 ES ES99902628T patent/ES2189384T3/es not_active Expired - Lifetime
- 1999-02-08 EP EP99902628A patent/EP1055070B1/fr not_active Expired - Lifetime
- 1999-02-08 JP JP2000531666A patent/JP4172005B2/ja not_active Expired - Fee Related
- 1999-02-08 DE DE69904299T patent/DE69904299T2/de not_active Expired - Fee Related
- 1999-02-08 WO PCT/FR1999/000284 patent/WO1999041501A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9941501A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2774727B1 (fr) | 2000-04-21 |
EP1055070B1 (fr) | 2002-12-04 |
DE69904299D1 (de) | 2003-01-16 |
ES2189384T3 (es) | 2003-07-01 |
FR2774727A1 (fr) | 1999-08-13 |
JP4172005B2 (ja) | 2008-10-29 |
JP2002503786A (ja) | 2002-02-05 |
WO1999041501A1 (fr) | 1999-08-19 |
DE69904299T2 (de) | 2003-08-21 |
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