EP0711384A1 - Zweistufige drehschiebervakuumpumpe - Google Patents
Zweistufige drehschiebervakuumpumpeInfo
- Publication number
- EP0711384A1 EP0711384A1 EP94925379A EP94925379A EP0711384A1 EP 0711384 A1 EP0711384 A1 EP 0711384A1 EP 94925379 A EP94925379 A EP 94925379A EP 94925379 A EP94925379 A EP 94925379A EP 0711384 A1 EP0711384 A1 EP 0711384A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- bearing
- pump according
- pump
- section
- 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
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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
-
- 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
-
- 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
Definitions
- the invention relates to a rotary vane vacuum pump with a high vacuum stage, with a fore vacuum stage, with an essentially cylindrical rotor which has bearing and armature sections, a bearing section being located between two armature sections and the armature sections being equipped with slide slots, and with a approximately pot-shaped housing which encloses the scooping spaces and the bottom part of which is designed as a bearing piece with a passage for a rotor drive.
- High vacuum pumps require extremely precise manufacture of the individual components that produce the gas. If, for example, in the case of a rotary vane vacuum pump, the gaps between the slides and the associated slide slots in the rotor, the gaps in the area of the anchor systems or - in the case of a two-stage rotary vane vacuum pump - the gaps in the sealing area between the high vacuum level and the fore-vacuum level, then the desired conveying direction occurs opposite flows (backflows), which significantly affect the pump properties - pumping speed, compression, final pressure behavior, etc.
- a two-stage rotary vane vacuum pump of the type mentioned at the outset is known from DE-A-2354039 (FIG. 3).
- the rotor In addition to the bearing section located between the armature sections, the rotor has yet another bearing section on one of its two end faces - on the side of the fore-vacuum stage. Both slider slots must therefore be milled into the rotor from the other end - the high vacuum side.
- the disadvantage of this is that a milling disk with a relatively large radius - larger than the sum of the lengths of both slides and the length of the central bearing section - must be used.
- a filler must be used again after milling the slide slots for the purpose of producing an operational rotor at the level of the central bearing section, so that the tight mutual separation of the two stages of the vacuum pump is ensured.
- the manufacture of a rotor of this type is complex. Milling the slide slots is only possible with a limited tolerance because of the need to use a milling disk with a relatively large diameter.
- the present invention has for its object to provide a two-stage rotary vane vacuum pump of the type mentioned, which can be manufactured more easily and with greater precision.
- each slide slot can be milled into the rotor cylinder from its associated end face. It is no longer necessary to produce a slot section which has to be filled in again later. Milling disks with much smaller radii can be used, which means that much smaller tolerances of the slot dimensions can be achieved. This not only improves the pump properties; the slide assembly is also easier since both slots are accessible from their respective end faces.
- FIG. 1 shows a longitudinal section through an exemplary embodiment of a rotary vane vacuum pump according to the invention
- FIG. 2 shows a rotor according to the invention
- FIG. 5 shows a longitudinal section through a further embodiment for a pump according to the invention.
- FIG. 6 shows another embodiment of a rotor according to the invention.
- the pump 1 shown essentially comprises the assemblies housing 2, rotor 3 and drive motor 4.
- the housing 2 has essentially the shape of a pot with an outer wall 5, with the lid 6, with an inner part 7 with the scoops 8, 9 and the bearing bore 11, with the end plate 12 and the bearing piece 13, which form the scoops Complete ends 8, 9.
- the axis of the bearing bore 11 is designated 14.
- the axes 15 and 16 of the scooping spaces 8, 9 are eccentric to this.
- two oil eyes 18, 19 are provided in the cover 6, oil filler and oil drain ports are not shown.
- the rotor 3 which is shown again in FIGS. 2 and 3, is located within the inner part 7. It is made in one piece and has two end faces Anchor sections 21, 22 and a bearing section 23 located between the anchor sections 21, 22. Bearing section 23 and the anchor sections 21, 22 have an identical diameter.
- the anchor sections 21, 22 are equipped with slots 25, 26 for slides 27, 28. These are each milled from the associated end face of the rotor, so that exact slot dimensions can be achieved in a simple manner.
- the bearing section 23 lies between the armature sections 21, 22.
- the bearing section 23 and the bearing bore 11 form the only bearing of the rotor. This bearing must be of sufficient axial length to prevent the rotor from wobbling.
- the length of the bearing is expediently to be chosen so that when the rotor 3 is tilted to the maximum possible, the rotor 3 is still floating due to the bearing play in the bearing bore 11, that is to say that it does not run against its two end faces at the same time.
- the anchor section 22 and the associated pump chamber 9 are longer than the anchor section 21 with the pump chamber 8.
- the anchor section 22 and the pump chamber 9 form the high vacuum stage.
- the inlet of the high vacuum stage 9, 22 is connected to the intake manifold 30.
- the outlet of the high vacuum stage 9, 22 and the inlet of the fore vacuum stage 8, 21 are connected via the housing bore 31 to their axis 32, which extends parallel to the axes 15, 16 of the scooping spaces 8, 9.
- the outlet of the fore-vacuum stage 8, 21 opens into the oil space 17, which comprises the oil sump 20. There, the oil-containing gases calm down and leave the pump 1 through the outlet connection 33.
- the inlet and outlet openings of the two pump stages are not shown in FIG. 1.
- the housing 2 of the pump is also expediently constructed from as few parts as possible. At least the wall sections 5, 7 comprising the two scooping spaces 8, 9 and the oil space 17 should be formed in one piece.
- the bearing piece 13 Coaxial with the axis 14 of the bearing bore 11, the bearing piece 13 is equipped with a bore 35 for a rotor drive. This can be directly the shaft 36 of the drive motor 4.
- a coupling piece 37 is provided between the free end face of the drive shaft 4 and the rotor 3. The coupling of the rotor 3 with the coupling piece 37 and the coupling piece 37 with the drive shaft 36 takes place in a form-fitting manner via projections and corresponding recesses.
- the rotor 3 is equipped on its end face facing the coupling piece 37 with an elongate recess 38 which extends perpendicular to the slide slot 26 (see also FIG. 2). With an elongated projection 39, the coupling piece 37 engages in the recess 38. The projection 39 of the coupling piece 37 is in turn equipped with the recess 41 which engages around the slide 28. A corresponding connection exists between the drive shaft
- FIG. 3 shows a further solution in which the drive-side end face of the rotor 3 is equipped with a shoulder 44 with a reduced diameter. This creates a slot in addition to the space occupied by the slide, into which an elongated projection on the coupling piece 37 or on the shaft 36 can engage.
- the high vacuum stage 9, 22 should have a higher pumping speed than the fore-vacuum stage.
- the axial length of the high vacuum stage must be greater than the length of the fore vacuum stage, for example at least twice as long.
- the arrangement of the high-vacuum stage on the drive side has the advantage that only the short forevacuum stage is flying is supported while the relatively long high vacuum stage is supported in the coupling piece 37 or - if this is not present - in the shaft 36.
- the pump of Figure 1 is finally equipped with an oil pump. This consists of the scooping space 45 let into the bearing piece 13 from the motor side with the eccentric 46 rotating therein. The eccentric is connected to a locking slide 47 which is under the pressure of the spiral spring 48.
- the inlet of the oil pump 45, 46 is connected to the oil sump 20 via a bore 51. All points of the pump 1 that require oil are connected to the outlet of the oil pump 45, 46.
- a bore 51 ' is shown which opens into the bearing section 11 in the inner part 7 of the pump 1 via a transverse bore 51' 'and supplies the bearing located there with lubricating oil.
- the eccentric 46 of the oil pump is part of the coupling piece 37. It is either fixed or positively connected - axially displaceably arranged on the projection 42 - to the coupling piece 37.
- the solution described provides the option of dispensing with a separate pump-side mounting of the motor shaft 36.
- the bearing piece 13 and - if present - the coupling piece 37 can take over this function.
- the end face shown is provided with a central blind bore 49 in which the compression spring 50 is located.
- the compression spring 50 is supported on the projection 43 of the coupling piece 37 and in the blind bore 49 and generates opposing forces on the shaft 37 (contact forces for the shaft bearing, not shown) 36) and the coupling piece 37.
- these forces also have an effect on the rotor 3, the fore-vacuum end of which is thus pressed against the end plate 12.
- This force reduces the gap between the rotor end face and the end plate 12 due to the play, so that a significant improvement in the compression capacity and thus a better final pressure can be achieved.
- This advantage of tightness in the area of the fore-vacuum stage arises independently of the existing tolerances and can therefore be achieved without a particular increase in the manufacturing effort.
- the coupling piece 37 also forms the running surface for a sealing ring 55, which is located in an annular recess 56 in the bearing piece 13, on the side of the bearing piece 13 facing the pump chamber 9. If the rotor 3 is directly coupled to the drive shaft 36, then can the bearing piece 13 be equipped with a further - motor-side - recess for a sealing ring. Finally, the bearing piece 13 also has the function of supporting the pump 1 via the foot 57 screwed onto the bearing piece 13.
- the bearing piece 13 is equipped on its side facing the engine 4 with a circular recess 58 in which a disk 59 is located. This is held in position by the housing 61 of the drive motor 4. It is equipped with a central bore 62 which is penetrated by the shaft 36 of the drive motor 4. The shaft 36 forms the running surface for a second shaft sealing ring 63, which is located in a recess 64 on the motor side of the disk 59.
- the disk 59 has the task of limiting the scooping space 45 of the oil pump 45, 46.
- the disk 59 - alone or together with the bearing piece 13 - can also form the only pump-side bearing of the motor shaft 36.
- the shaft 36 of the drive motor 4 is directly coupled to the rotor 3.
- the bearing piece 13 there are two cutouts 56 with seals 55 since the cover disk 59 can be omitted.
- a cam 40 arranged on the shaft side engages in the cutout 38 of the rotor 3.
- the oil pump 45, 46 is located in the end disk 12 on the fore-vacuum side. which is equipped with a cover 52 to accommodate the oil pump 45.
- the eccentric 46 of the oil pump is driven by projections or cams 53 on the fore-vacuum end of the rotor 3 (see also FIG. 4).
- the oil pump 45, 46 is connected to the oil sump 20 via the bore 51. Channels connected to the outlet of the oil pump 45, 46 and leading to locations in the pump 1 to be supplied with oil are not shown.
- FIG. 6 shows a further exemplary embodiment for the rotor 3.
- the bearing section 23 and the armature section 21 of the fore-vacuum stage 8, 21 have a smaller diameter than the armature section 22 of the high vacuum stage 9, 22 in order to keep the frictional forces small in these areas.
- the diameter of the scooping chamber 8 and the bearing bore 11 must also be reduced.
- the cutouts 38 in the free end face of the armature section 22 of the high vacuum stage 9, 22 have the shape of blind bores. Accordingly, the projections 39 on the coupling piece 37 must be pin-shaped (not shown).
- the bearing section 23 is provided with a circumferential groove 70 which is approximately at the level of the mouth of the Cross bore 11 (see FIG. 1) is located. This ensures a sufficient supply of lubricant to the bearing.
- the armature section 21 of the fore-vacuum stage is equipped with a longitudinal bore 71 which starts from its end face and is connected to a transverse bore 72.
- the mouth 73 of the transverse bore 72 is located at the level of the groove 70 and thus also in the region of the mouth of the transverse bore on the housing 51 ".
- the bores 71, 72 are used to lubricate the gap between the end face of the armature section 21 and the bearing cover 12.
- the exemplary embodiments shown consist of a minimum of individual parts. This is achieved in that some components have multiple functions.
- the pump according to the invention is thereby easier to manufacture and thus more cost-effective.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4325286A DE4325286A1 (de) | 1993-07-28 | 1993-07-28 | Zweistufige Drehschiebervakuumpumpe |
DE4325286 | 1993-07-28 | ||
PCT/EP1994/002425 WO1995004221A1 (de) | 1993-07-28 | 1994-07-22 | Zweistufige drehschiebervakuumpumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0711384A1 true EP0711384A1 (de) | 1996-05-15 |
EP0711384B1 EP0711384B1 (de) | 1997-05-14 |
Family
ID=6493895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94925379A Expired - Lifetime EP0711384B1 (de) | 1993-07-28 | 1994-07-22 | Zweistufige drehschiebervakuumpumpe |
Country Status (6)
Country | Link |
---|---|
US (1) | US5879138A (de) |
EP (1) | EP0711384B1 (de) |
JP (1) | JP3614434B2 (de) |
KR (1) | KR100335037B1 (de) |
DE (2) | DE4325286A1 (de) |
WO (1) | WO1995004221A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202016005229U1 (de) | 2016-08-26 | 2016-12-29 | Oerlikon Leybold Vacuum Gmbh | Mehrstufige Drehschieberpumpe |
DE202015006922U1 (de) | 2015-10-02 | 2017-01-03 | Leybold Gmbh | Mehrstufige Drehschieberpumpe |
CN108291543A (zh) * | 2015-10-02 | 2018-07-17 | 莱宝有限公司 | 多级旋转叶片泵 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6929455B2 (en) | 2002-10-15 | 2005-08-16 | Tecumseh Products Company | Horizontal two stage rotary compressor |
US7059839B2 (en) | 2002-12-10 | 2006-06-13 | Tecumseh Products Company | Horizontal compressor end cap with a terminal, a visually transparent member, and a heater well mounted on the end cap projection |
DE502004004579D1 (de) * | 2003-06-30 | 2007-09-20 | Mahle Motorkomponenten Schweiz | Rotor aus sintermetall einer drehkolbenpumpe |
DE102006058839A1 (de) * | 2006-12-13 | 2008-06-19 | Pfeiffer Vacuum Gmbh | Schmiermittelgedichtete Drehschiebervakuumpumpe |
JP5781334B2 (ja) * | 2011-03-04 | 2015-09-24 | アルバック機工株式会社 | 油回転真空ポンプ |
KR102027219B1 (ko) * | 2018-12-24 | 2019-10-01 | 주식회사 백콤 | 내부점검과 이물질 제거기능을 갖는 수봉식 진공펌프 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2902210A (en) * | 1955-08-15 | 1959-09-01 | Edwards High Vacuum Ltd | Multi-stage mechanical vacuum pumps |
US2877946A (en) * | 1955-11-10 | 1959-03-17 | Central Scientific Co | Vacuum pump |
US3525578A (en) * | 1968-11-29 | 1970-08-25 | Precision Scient Co | Vacuum pump |
DE2354039A1 (de) * | 1973-10-29 | 1975-05-07 | Leybold Heraeus Gmbh & Co Kg | Drehschieberpumpe |
DE2401171A1 (de) * | 1974-01-11 | 1975-07-24 | Pfeiffer Vakuumtechnik | Oelfuehrung in einer drehschieberpumpe |
DE3805346A1 (de) * | 1987-04-04 | 1988-10-20 | Barmag Barmer Maschf | Fluegelzellenpumpe |
DD299393A7 (de) * | 1989-08-09 | 1992-04-16 | Zwetkow,Zwetko,Bg | Oelpumpe fuer rotierende vakuumpumpen |
DE9007544U1 (de) * | 1990-05-29 | 1992-08-13 | Leybold AG, 6450 Hanau | Drehschiebervakuumpumpe |
DE4017192A1 (de) * | 1990-05-29 | 1991-12-05 | Leybold Ag | Verfahren zur herstellung eines pumpenringes fuer eine zweistufige vakuumpumpe sowie mit einem derartigen pumpenring ausgeruestete vakuumpumpe |
DE4017191A1 (de) * | 1990-05-29 | 1991-12-05 | Leybold Ag | Verfahren zur oelversorgung einer zweistufigen drehschiebervakuumpumpe und fuer die durchfuehrung dieses verfahrens geeignete drehschiebervakuumpumpe |
JPH06185482A (ja) * | 1992-12-22 | 1994-07-05 | Nippon Soken Inc | ベーン型圧縮機 |
-
1993
- 1993-07-28 DE DE4325286A patent/DE4325286A1/de not_active Withdrawn
-
1994
- 1994-07-22 JP JP50541795A patent/JP3614434B2/ja not_active Expired - Fee Related
- 1994-07-22 KR KR1019960700472A patent/KR100335037B1/ko not_active IP Right Cessation
- 1994-07-22 DE DE59402769T patent/DE59402769D1/de not_active Expired - Fee Related
- 1994-07-22 WO PCT/EP1994/002425 patent/WO1995004221A1/de active IP Right Grant
- 1994-07-22 EP EP94925379A patent/EP0711384B1/de not_active Expired - Lifetime
- 1994-07-22 US US08/586,926 patent/US5879138A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9504221A1 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202015006922U1 (de) | 2015-10-02 | 2017-01-03 | Leybold Gmbh | Mehrstufige Drehschieberpumpe |
CN108291543A (zh) * | 2015-10-02 | 2018-07-17 | 莱宝有限公司 | 多级旋转叶片泵 |
US11592024B2 (en) | 2015-10-02 | 2023-02-28 | Leybold Gmbh | Multi-stage rotary vane pump |
DE202016005229U1 (de) | 2016-08-26 | 2016-12-29 | Oerlikon Leybold Vacuum Gmbh | Mehrstufige Drehschieberpumpe |
Also Published As
Publication number | Publication date |
---|---|
DE4325286A1 (de) | 1995-02-02 |
WO1995004221A1 (de) | 1995-02-09 |
KR960704158A (ko) | 1996-08-31 |
KR100335037B1 (ko) | 2002-11-27 |
US5879138A (en) | 1999-03-09 |
EP0711384B1 (de) | 1997-05-14 |
DE59402769D1 (de) | 1997-06-19 |
JPH09500703A (ja) | 1997-01-21 |
JP3614434B2 (ja) | 2005-01-26 |
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