WO2018166875A1 - Lubricant-sealed vacuum pump - Google Patents
Lubricant-sealed vacuum pump Download PDFInfo
- Publication number
- WO2018166875A1 WO2018166875A1 PCT/EP2018/055656 EP2018055656W WO2018166875A1 WO 2018166875 A1 WO2018166875 A1 WO 2018166875A1 EP 2018055656 W EP2018055656 W EP 2018055656W WO 2018166875 A1 WO2018166875 A1 WO 2018166875A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lubricant
- vacuum pump
- sealed vacuum
- main seal
- seal
- Prior art date
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
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
-
- 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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, 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 group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, 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 group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
-
- 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
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
-
- 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
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/809—Lubricant sump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/57—Seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/98—Lubrication
Definitions
- the present invention relates to a lubricant-sealed vacuum pump, particularly a rotary vane pump.
- Lubricant-sealed vacuum pumps such as e.g. rotary vane pumps comprise a pump housing in which a suction chamber is defined. Within the suction chamber, at least one rotor element is arranged. In a rotary vane pump, the rotor element is arranged eccentrically within a cylindrical suction chamber. The rotor element is provided with a plurality of sliding vanes which are radially slideable in the rotor element, with the outer edge of the sliding vanes being in abutment on the inner wall of the suction chamber. As a result of the eccentric arrangement of the rotor element, the volume of the individual chambers formed by the sliding vanes will be changing so that the to-be-conveyed medium will be compressed .
- lubricant is supplied to the at least one rotor element.
- the lubricant is provided to achieve a sealing between the rotor element and the inner wall of the suction chamber.
- the lubricant serves for generating a sealing effect between the sliding vanes connected to the rotor element, and the inner wall of the suction chamber.
- the lubricant supply duct normally extends within the rotor, wherein the lubricant will be supplied to the recesses of the rotor in which the sliding vanes are held for radial displacement. Under the effect of the centrifugal forces, the lubricant will then reach the outer edge of the sliding vane that has the inner wall of the suction chamber abutting on it.
- the rotor element is enclosed by a housing in which the shaft is arranged.
- the shaft is driven by an electric drive motor.
- a main seal is provided.
- the latter normally comprises a sealing lip which is in abutment on the shaft surface or e.g . also on an outer side of a shell which is connected to the shaft in this area.
- the provision of a shell may, depending on the given circumstances, have advantages in the assembly process and/or the advantage that the shell can be formed of a material improving the sealing tightness. Even in seals of high quality, leakages may happen to occur, particularly after many hours of use. Such leakages may be caused e.g . by particles intruding into the lubricant.
- These particles may intrude into the lubricant e.g . as a result of abrasion or the like, or they may enter the lubricant out of the medium which is to be conveyed by the vacuum pump. If such particles happen to reach the area between the sealing lip of the seal and the shaft surface or the outer side of the shell surrounding the shaft, leakages will occur on the shaft seal.
- the lubricant-sealed vacuum pump comprises, apart from the main seal, an additional seal.
- the main seal normally comprises a seal lip arranged in abutment on the shaft surface or on an outer side of a shell surrounding the shaft.
- the preferably annular additional seal is arranged on an inner side of the main seal that is facing toward the suction chamber.
- the additional seal comprises a sealing lip arranged in abutment on the shaft surface or on the outer side of the shell surrounding the shaft.
- two seals are provided directly adjacent to each other, wherein it is preferred that both seals comprise a sealing lip arranged in abutment on the shaft surface or on the outer side of the shell .
- the sealing lip of the additional seal By providing a main seal and an additional seal, it is e.g . possible to produce the sealing lip of the additional seal within a mold and or to produce it from a material which is especially suited to prevent the intrusion of particles into the area between the additional seal and the main seal and respectively to reduce the risk of such an intrusion.
- the additional seal serves as a kind of filter preventing the transport of particles in the direction of the main seal.
- the material for the main seal can thus be selected substantially under the aspect of achieving the best possible sealing effect, while the material for the additional seal will be selected substantially under the aspect of a safe retention of damaging particles.
- material for the main seal the use of Viton, FKM, FPM, PTFE and/or EPDM is preferred.
- the additional seal is preferably made of textile fiber and/or non-woven textile. It is possible to use organic or non-organic textiles.
- the additional seal is connected to the main seal, particularly fixedly.
- the additional seal can be fixedly connected to an inner side of the main seal by bonding, locking engagement or the like.
- the additional seal comprises a particularly annular projection extending into a particularly annular recess of the main seal.
- the additional seal comprises a holding element.
- the holding element carries the sealing element of the additional comprising the sealing lip.
- the sealing element can be connected to the holding element e.g . by bonding, welding or the like.
- the holding element is connected - particularly fixedly - to the main seal and, according to a preferred embodiment, comprises the above described projections for connection to the main seal . Further, the holding element can also be connected to the main seal in one piece.
- the sealing lip is arranged at an inclination and is facing in the direction of the suction chamber. Achieved in this manner is a better retention of particles and respectively a better filtering effect of the additional seal.
- the holding element comprises a support element which supports the sealing lip and respectively has the sealing lip resting on it.
- the support element is preferably arranged at an inclination in the direction of the suction chamber.
- the inclination of the support element and/or of the sealing lip relative to the shaft surface and respectively the outer side of the shell is preferably in an angular range from 10° to 60°.
- an outer side of the main seal has an annular cover element connected to it.
- the outer side of the main seal is the side of the main seal that faces away from the suction chamber.
- Said cover element which particularly can also be formed as an annular protrusion, is preferably formed in one piece with the main seal and is connected to it by bonding, welding, locking engagement of the like.
- an outer edge of the cover element faces in the direction of the shaft and has a smaller diameter than the outer diameter of the shell.
- the cover element covers the shell in radial direction.
- a particularly preferred embodiment of the invention additionally provides a conveying element arranged on the inner side of the collection chamber.
- the lubricant that has reached the collection chamber will be conveyed in the direction of the suction chamber.
- said conveying element is formed as a feed screw arranged on the inner side of the collection chamber.
- the inner side of the collection chamber particularly in the area where the conveying element is arranged, has a - particularly continuously - decreasing diameter in the direction of the suction chamber.
- a collection element for lubricant on an outer side of the main seal and/or on an outer side of the housing that surrounds the main seal there is additionally provided a collection element for lubricant on an outer side of the main seal and/or on an outer side of the housing that surrounds the main seal.
- a further extension of the useful life can be achieved .
- the function of said collection element resides in that, if lubricant should issue from the collection chamber, this lubricant will be received or sucked by the collection element.
- Said collection element herein is particularly formed similar to a sponge or the like.
- the collection element can be of an annular shape and surround the shaft particularly entirely.
- a cover element on the outer side of the main seal particularly in connection with the collection element on the outer side of the main seal and/or the outer side of the housing, represents an invention in its own right that is independent from the additional seal provided on the inner side of the main seal.
- the combination of the two inventions is preferred.
- Fig. 1 is a largely simplified schematic sectional view of a rotary vane pump
- Fig. 2 is a view of a preferred embodiment of the shaft seal according to the invention.
- Fig. 3 is an enlarged schematic view of a part of the shaft sealing .
- a rotary vane pump comprises a suction chamber 10 formed by a housing 12. Suction chamber 10 is connected to an inlet 14. Inlet 14 is connected to a chamber, not shown, which is to be evacuated, and again comprises an inlet valve, not shown.
- a rotor element 16 is eccentrically arranged, so that different chambers 18 are formed in the cylindrical suction chamber 10. Said chambers 18 are respectively delimited by sliding vanes 20 which are held in the rotor element in slots and respectively recesses 22 in a manner allowing for radial displacement of the vanes therein. Said recesses 22 are connected to lubricant supply channels 24 (only schematically outlined in the Figures).
- Rotor element 16 is carried by a rotor shaft 26.
- the rotor element 16 and the rotor shaft 26 can be made of one part.
- the smallest chamber 18 has an outlet 28 connected to it.
- an outlet valve is provided, particularly in the form of an oil-sealed valve plate or the like.
- the two inventions related to an additional seal arranged within the main seal, and related to the collection chamber arranged outside the main seal and to the collection element, are combined .
- the shaft 26 is surrounded by a shell 30 or sleeve ring .
- the shell 30 is e.g . pressed onto the shaft 26.
- shell 30 is surrounded by a main seal 32.
- the main seal 32 comprises a sealing lip 34 arranged in abutment on an outer side 36 of shell 30.
- an annular metallic spring 38 could be arranged on the inner side of the sealing lip 34.
- Connected to the sealing lip 34 is a C-shaped annular element 40 of the main seal 32.
- the main seal 32 is arranged in an annular recess of housing 12.
- an annular additional seal 44 is arranged on an inner side 42 of main seal 32 facing in the direction of the suction chamber 10.
- the additional seal 44 is of a two-part design and comprises a sealing element 46 and a holding element 48.
- the sealing element 46 forms a sealing lip 50 which again is arranged in sealing abutment on the outer side 36 of shell 30.
- the sealing lip 50 serves for filtering out or retaining particles so that these cannot advance in the direction of the sealing lip 34 of main seal 32.
- Sealing lip 50 is inclined and respectively arranged at an inclination in the direction of the suction chamber 10.
- the additional seal 44 comprises a holding element 52 supporting this portion of sealing element 46.
- the supporting element 52 is not in contact with the rotating sleeve 30. There is a radial clearance between the supporting element 52 and the sleeve 30.
- the holding element 48 of the additional seal 44 further comprises one or two axial annular projections 54,56. These serve particularly for connection to the C-shaped element 40 of main seal 32.
- the two projections 54,56 extend into the opening 58 of main seal 32 formed by C-shaped element 40.
- the additional seal 44 is connected to the main seal 32 by clamping or gluing of annular ring 54 in the C-shaped element 40.
- a cover element 62 is arranged on an outer side 60 ( Figure 3) of the main seal 32.
- Said cover element 62 which in the illustrated exemplary embodiment is formed as a part-ring- shaped projection, comprises an outer edge 64 facing in the direction of a shaft surface 65, but not in contact with it. There is a clearance between the static lip 64 and the rotating surface 65. The diameter of said outer edge 64 is smaller than the outer diameter of shell 30. In this manner, there is formed a collection chamber 66 for collection of lubricant which may happen to leak out in the area of sealing lip 34.
- a conveying element 72 For returning such leaked lubricant in the direction of the collection chamber 66, as illustrated by the arrow 68, a conveying element 72, particularly formed as a spiral, is arranged on an inner side 70 of collection chamber 66. Particularly because, in the area of the conveying element 72, said inner side 70 has a decreasing diameter in the direction of the suction chamber, possibly leaking lubricant will be reliably conveyed back from the collection chamber 66 into the suction chamber 10.
- Collection element 74 is preferably made from an organic or non-organic sponge-like material.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201880014004.1A CN110337544B (en) | 2017-03-14 | 2018-03-07 | Lubricating oil sealed vacuum pump |
KR1020197026666A KR102519962B1 (en) | 2017-03-14 | 2018-03-07 | Lube-sealed vacuum pump |
JP2019549422A JP7231554B2 (en) | 2017-03-14 | 2018-03-07 | Lubricant-filled vacuum pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17160775.7A EP3376033B1 (en) | 2017-03-14 | 2017-03-14 | Lubricant-sealed vacuum pump |
EP17160775.7 | 2017-03-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018166875A1 true WO2018166875A1 (en) | 2018-09-20 |
Family
ID=58347120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2018/055656 WO2018166875A1 (en) | 2017-03-14 | 2018-03-07 | Lubricant-sealed vacuum pump |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3376033B1 (en) |
JP (1) | JP7231554B2 (en) |
KR (1) | KR102519962B1 (en) |
CN (1) | CN110337544B (en) |
TW (1) | TWI750335B (en) |
WO (1) | WO2018166875A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2758120A1 (en) * | 1977-12-24 | 1979-06-28 | Pfeiffer Vakuumtechnik | Rotary vacuum pump with oil sealed outlet valve above oil level - feeds excess oil from oil circulation pump into oil seal of valve |
JPS59173592A (en) * | 1983-03-18 | 1984-10-01 | Noritake Co Ltd | Injecting method and its device of seal liquid in vacuum pump of vane type |
US5022836A (en) * | 1989-08-10 | 1991-06-11 | Mitsubishi Denki Kabushiki Kaisha | Sealing device for oil rotary vacuum pump |
US5697771A (en) * | 1993-08-17 | 1997-12-16 | Leybold Aktiengesellschaft | Vacuum pump with oil separator |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6158985A (en) * | 1984-08-31 | 1986-03-26 | Sanden Corp | Shaft seal device in opened type compressor |
DE3619309C1 (en) * | 1986-06-07 | 1987-09-17 | Freudenberg Carl Fa | Cooling water pump seal |
JPS63230969A (en) * | 1987-03-20 | 1988-09-27 | Hitachi Ltd | Vacuum pump direct-coupled type generator |
JP2931009B2 (en) * | 1990-01-25 | 1999-08-09 | エヌオーケー株式会社 | Sealing device and method of manufacturing sealing device |
JPH0544852A (en) * | 1991-08-09 | 1993-02-23 | Hitachi Ltd | Oil seal for vacuum pump |
JP2570192Y2 (en) * | 1992-07-30 | 1998-05-06 | キーパー株式会社 | Oil seal device |
JPH0960732A (en) * | 1995-08-25 | 1997-03-04 | Arai Pump Mfg Co Ltd | Sealing structure for water pump |
JPH09303569A (en) * | 1996-05-17 | 1997-11-25 | Eagle Ind Co Ltd | Lip type seal |
JP2000110946A (en) * | 1998-10-06 | 2000-04-18 | Koyo Sealing Techno Co Ltd | Hermetic sealing device |
CN100443724C (en) * | 2003-06-30 | 2008-12-17 | 卢克汽车-液压系统两合公司 | Pump |
US7827786B2 (en) * | 2007-05-24 | 2010-11-09 | Gm Global Technology Operations, Inc. | Seal assembly for reducing fluid loss from transmission pump |
JP5550419B2 (en) * | 2010-03-31 | 2014-07-16 | 三菱重工業株式会社 | Compressor |
CN201651326U (en) * | 2010-04-06 | 2010-11-24 | 中国重汽集团济南动力有限公司 | Assembled rotary shaft seal ring |
CN203730767U (en) * | 2014-03-28 | 2014-07-23 | 广东京汕密封件有限公司 | Dustproof high-speed-resistant combined oil seal for shaft |
CN204042005U (en) * | 2014-06-18 | 2014-12-24 | 上海大亚密封技术有限公司 | Oil sealing |
FR3037354B1 (en) * | 2015-06-12 | 2019-05-10 | Poclain Hydraulics Industrie | HYDRAULIC SYSTEM WITH DRAINED CHAMBER |
-
2017
- 2017-03-14 EP EP17160775.7A patent/EP3376033B1/en active Active
-
2018
- 2018-02-27 TW TW107106611A patent/TWI750335B/en active
- 2018-03-07 CN CN201880014004.1A patent/CN110337544B/en active Active
- 2018-03-07 KR KR1020197026666A patent/KR102519962B1/en active IP Right Grant
- 2018-03-07 WO PCT/EP2018/055656 patent/WO2018166875A1/en active Application Filing
- 2018-03-07 JP JP2019549422A patent/JP7231554B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2758120A1 (en) * | 1977-12-24 | 1979-06-28 | Pfeiffer Vakuumtechnik | Rotary vacuum pump with oil sealed outlet valve above oil level - feeds excess oil from oil circulation pump into oil seal of valve |
JPS59173592A (en) * | 1983-03-18 | 1984-10-01 | Noritake Co Ltd | Injecting method and its device of seal liquid in vacuum pump of vane type |
US5022836A (en) * | 1989-08-10 | 1991-06-11 | Mitsubishi Denki Kabushiki Kaisha | Sealing device for oil rotary vacuum pump |
US5697771A (en) * | 1993-08-17 | 1997-12-16 | Leybold Aktiengesellschaft | Vacuum pump with oil separator |
Also Published As
Publication number | Publication date |
---|---|
JP2020510787A (en) | 2020-04-09 |
TW201833443A (en) | 2018-09-16 |
CN110337544B (en) | 2021-10-08 |
KR20190120246A (en) | 2019-10-23 |
EP3376033A1 (en) | 2018-09-19 |
KR102519962B1 (en) | 2023-04-07 |
EP3376033B1 (en) | 2020-11-25 |
TWI750335B (en) | 2021-12-21 |
JP7231554B2 (en) | 2023-03-01 |
CN110337544A (en) | 2019-10-15 |
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