EP2783073B1 - Flüssigkeitsring-vakuumpumpe und flügelrad dafür - Google Patents
Flüssigkeitsring-vakuumpumpe und flügelrad dafür Download PDFInfo
- Publication number
- EP2783073B1 EP2783073B1 EP12791749.0A EP12791749A EP2783073B1 EP 2783073 B1 EP2783073 B1 EP 2783073B1 EP 12791749 A EP12791749 A EP 12791749A EP 2783073 B1 EP2783073 B1 EP 2783073B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- liquid
- vacuum pump
- ring 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
- 239000007788 liquid Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 24
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 4
- 239000004417 polycarbonate Substances 0.000 claims description 4
- 229920000515 polycarbonate Polymers 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- -1 polyoxymethylene Polymers 0.000 claims description 4
- 229920006324 polyoxymethylene Polymers 0.000 claims description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 4
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000011151 fibre-reinforced plastic Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000010006 flight Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 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
- F04C19/00—Rotary-piston pumps with fluid ring or the like, 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
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/06—Polyamides, e.g. NYLON
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/12—Polyetheretherketones, e.g. PEEK
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/02—Elasticity
Definitions
- the invention relates to a liquid ring vacuum pump with a pump housing and an impeller mounted eccentrically in the pump housing.
- the invention also relates to an impeller for such a pump.
- Pumps of this type can be used to evacuate containers or other enclosed spaces. An inlet opening of the pump is connected to the room to be evacuated, the gas contained in the room is sucked in through the inlet opening, compressed in the pump and released again through an outlet opening.
- liquid ring vacuum pumps In liquid ring vacuum pumps, a liquid ring is kept in motion by the impeller, so that the chambers between the vanes of the impeller are closed off by the liquid ring. Since the impeller is eccentrically mounted in the pump housing, the liquid ring penetrates into the chamber to different extents, depending on the angular position of the impeller, and thus acts as a piston that changes the volume of the chamber. Since the entire force required for this is transmitted through the impeller, the impeller is a highly stressed component.
- the impeller is subjected to a strong alternating load, since the force on the blades acts in different directions depending on whether the liquid ring moves into the chambers or moves out of the chambers.
- the impeller is designed with high rigidity.
- the high rigidity ensures that the impeller is not deformed under the alternating loads. Deformation of the impeller is undesirable because larger tolerances between the impeller and the pump housing are then required.
- the leakage flow increases due to larger tolerances, which also means a reduction in the efficiency of the pump.
- the impeller is subjected to several loads.
- the pressure load on the wings comes to the fore.
- a strong pressure change is observed, which leads to an alternating load due to bending.
- high alternating bending stresses occur at the leaf root. These are further increased if condensate is conveyed.
- cavitation cannot be prevented with a liquid ring vacuum pump. Cavitation not only leads to damage to the surface, additional bending alternating stresses also occur in addition to the above-mentioned loads.
- materials must be selected that can withstand these loads.
- the impeller mainly consists of metallic materials. We find welded steel structures, cast iron wheels, stainless steel or bronze wheels. The modulus of elasticity for these materials is regularly greater than 100,000 N / mm 2 . Impellers made of fiber-reinforced plastics are also known, CN 201650734 . The modulus of elasticity is then of the order of 20,000 N / mm 2 .
- Impellers made of fiber-reinforced plastics are also known, CN 201650734 .
- the modulus of elasticity is then of the order of 20,000 N / mm 2 .
- the strength of the material When selecting the materials, the strength of the material, the chemical resistance, the cavitation resistance and the price play a particularly important role.
- a disadvantage of impellers with high rigidity is that sudden loads which the impeller experiences during the operation of the pump are transmitted to other components of the pump essentially unfiltered. Sudden loads on the impeller are particularly to be expected if cavitation occurs in the liquid ring. If the impeller has a high level of rigidity, it is essential to avoid operating conditions in which there is a risk of cavitation. Liquid ring vacuum pumps are therefore usually operated in such a way that a clear distance from the cavitation limit is maintained at all times. However, this sacrifices part of the possible efficiency.
- the invention is based on the object of presenting a liquid ring vacuum pump in which the risk of damage from cavitation is reduced.
- the object is achieved with the features of claim 1.
- the impeller consists of a material whose modulus of elasticity is less than 4000 N / mm 2 .
- Advantageous embodiments can be found in the subclaims.
- the invention thus proposes an impeller that deforms under the influence of forces much more than corresponding impellers made of classic materials. Due to its flexibility, the material is suitable for giving in to the alternating load and the cavitation forces that occur, thereby relieving tension.
- the invention has recognized that the associated disadvantages are offset by the improved resistance of the pump to cavitation. The sudden loads that occur during cavitation are cushioned by the impeller and not transmitted unfiltered to the other components of the pump. This makes it possible to operate the pump closer to the cavitation limit without significantly reducing the service life. Operating near the cavitation limit increases the efficiency of the pump.
- Damage from cavitation can also occur on the impeller itself.
- the surface is initially attacked by high local loads. The damage can then continue into the structure of the impeller. This occurs in particular if the impeller is made of a fiber-reinforced material. Where the fibers come from kick the surface of the impeller, because the surface is susceptible to initial damage. When cavitation occurs, cavitation bubbles can attach to these exposed fibers and lead to severe surface damage when imploded.
- the impeller is therefore preferably made of a non-fiber reinforced material. The result is a homogeneous surface that has fewer points of attack for damage.
- Unreinforced plastic materials also have the advantage that the noise emissions in cavitation mode are low, since unreinforced plastics have good damping behavior. Examples include polyoxymethylene (POM), polyether ether ketones (PEEK), polyamides (PA), polybutylene terephthalate (PBT), polycarbonates (PC), polyphenylene sulfide (PPS).
- POM polyoxymethylene
- PEEK polyether ether ketones
- PA polyamides
- PBT polybutylene terephthalate
- PC polycarbonates
- PPS polyphenylene sulfide
- the elastic modulus of these materials is between 2000 N / mm 2 and 4000 N / mm 2 .
- the impeller is preferably provided with a hub, via which a coherent connection with a shaft of the pump can be established.
- the shaft is mounted eccentrically in the pump housing, while the hub is centered in the impeller.
- a plurality of vanes extend radially outward from the hub.
- the number of wings can be, for example, between 10 and 20.
- the chambers enclosed between two blades together with the liquid ring form the working chambers of the pump.
- the chambers are open towards one end to enable the gas to be conveyed to be supplied and removed.
- the impeller borders on one Control disc of the pump, in which inlet openings and outlet openings are provided in suitable positions.
- the gap between the wings and the control disc is kept as small as possible in order to minimize the leakage flow.
- the vanes can be inclined relative to the axial direction, so that the impeller is pressed in the direction of the control disk by the flow force.
- the chambers are preferably closed on the opposite end face of the impeller.
- the impeller can comprise a disk-shaped projection which extends radially outward from the hub so far that the disk-shaped projection projects over its entire circumference into the liquid ring during operation of the pump.
- the wings preferably project further into the liquid ring than the disk-shaped projection.
- the invention also relates to an impeller for such a liquid ring vacuum pump.
- the impeller includes a hub for a positive connection to an eccentrically mounted shaft of the pump.
- a plurality of vanes extend radially outward from the hub.
- the wings are covered by a disk-shaped projection over at least half of their radial extent.
- the impeller consists of a material whose modulus of elasticity is less than 4000 N / mm 2 .
- the impeller is preferably made in one piece from a plastic material, the plastic material being further preferably unreinforced.
- the impeller can with further features are developed, which are described above with reference to the pump according to the invention.
- an impeller 14 is mounted eccentrically in a pump housing 20. Liquid in the interior of the pump is carried along by the rotating impeller 14 and forms a liquid ring which extends radially inward from the outer wall of the pump housing 20. Due to the eccentric mounting, the vanes of the impeller 14 project into the liquid ring at different depths depending on the angular position. The volume of a chamber 22 enclosed between two flights changes as a result. The liquid ring thus acts like a piston which moves up and down in the chamber during one revolution of the impeller 14.
- a channel leads from an inlet opening 16 into the interior of the pump, in which the impeller 14 rotates.
- the channel 16 opens out in the area in which the vanes of the impeller 14 emerge from the liquid ring, in which the chamber enclosed between two vanes increases. Gas will pass through the enlarging chamber the inlet opening 16 is sucked into the chamber. After the chamber has reached its maximum volume, the liquid ring penetrates the chamber again as the impeller 14 rotates further. When the gas is sufficiently compressed by the further penetrating liquid ring, it is released again at atmospheric pressure through an outlet opening 17.
- Such a liquid ring vacuum pump serves to evacuate a space connected to the inlet opening 16 to a pressure of, for example, 50 millibars.
- the impeller 14 is connected via a shaft 18 to a drive motor 19.
- the pump is designed in a block construction, the drive and the impeller 14 are therefore accommodated together in the pump housing 20. Electrical energy is supplied to the drive 19 via a control unit 21 arranged on the pump housing 20 and the speed of the pump is set.
- the impeller 14 has according to Fig. 3 fifteen vanes 23 extending radially outward from a central hub 24.
- the impeller 14 is connected to the shaft 18 of the pump via the hub 24.
- the wings 23 have a three-dimensional shape, which includes a curvature with respect to the radial direction.
- visible end face of the impeller 14 points in the installed state in the direction of the control disc of the pump.
- the chambers 22 arranged between each two vanes 23 are thus open to the control disk, so that the gas to be conveyed can be supplied and discharged through openings in the control disk.
- the impeller 14 On its opposite end face, the impeller 14 has a disc-shaped projection 25 which is different from the Hub 24 extends radially outward.
- the radial extension of the disk-shaped projection 25 is such that the disk-shaped projection 25 plunges into the liquid ring over its entire circumference when the pump is in operation.
- the wings 23 protrude somewhat beyond the disk-shaped projection 25 in the radial direction, so that an effective force transmission between the wings 23 and the liquid ring is achieved.
- the impeller 14 is made in one piece from a non-fiber-reinforced plastic material.
- the elastic modulus of the material is between 2000 N / mm 2 and 4000 N / mm 2 .
- the material is therefore comparatively flexible, so that sudden loads on the impeller can be partially absorbed by the material.
- the impeller Since the material is not fiber-reinforced, the impeller has a homogeneous surface. Even if large pressure and speed peaks occur locally as a result of cavitation in the operating fluid, the surface withstands the loads and there is no damage to the impeller. For this reason, the liquid ring vacuum pump can be operated closer to the cavitation limit by the impeller according to the invention, so that the efficiency of the pump is increased.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12791749.0A EP2783073B1 (de) | 2011-11-22 | 2012-11-21 | Flüssigkeitsring-vakuumpumpe und flügelrad dafür |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11190049 | 2011-11-22 | ||
PCT/EP2012/073150 WO2013076107A2 (de) | 2011-11-22 | 2012-11-21 | Flüssigkeitsring-vakuumpumpe und flügelrad für eine flüssigkeitsring-vakuumpumpe |
EP12791749.0A EP2783073B1 (de) | 2011-11-22 | 2012-11-21 | Flüssigkeitsring-vakuumpumpe und flügelrad dafür |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2783073A2 EP2783073A2 (de) | 2014-10-01 |
EP2783073B1 true EP2783073B1 (de) | 2020-05-27 |
Family
ID=47257793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12791749.0A Active EP2783073B1 (de) | 2011-11-22 | 2012-11-21 | Flüssigkeitsring-vakuumpumpe und flügelrad dafür |
Country Status (7)
Country | Link |
---|---|
US (1) | US20140286797A1 (zh) |
EP (1) | EP2783073B1 (zh) |
JP (1) | JP6151710B2 (zh) |
CN (1) | CN104081004B (zh) |
BR (1) | BR112014012096B1 (zh) |
MX (1) | MX351024B (zh) |
WO (1) | WO2013076107A2 (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105626528A (zh) * | 2016-02-29 | 2016-06-01 | 芜湖环球汽车配件有限公司 | 一种水环真空泵 |
GB2550365B (en) * | 2016-05-17 | 2020-08-12 | Edwards Ltd | Improved liquid ring pump |
US11383199B1 (en) * | 2018-03-30 | 2022-07-12 | Black Swan, Llc | Process and system for low pressure CO2 capture and bio-sequestration |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10317010A1 (de) * | 2003-04-11 | 2004-11-04 | Schmitt-Kreiselpumpen Gmbh & Co. Kg | Wirbelpumpe |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE942107C (de) * | 1952-02-01 | 1956-04-26 | Siemens Ag | Laufrad fuer Fluessigkeitsringpumpen |
JPS4719677Y1 (zh) * | 1969-05-10 | 1972-07-04 | ||
US3846046A (en) * | 1971-03-03 | 1974-11-05 | Nash Engineering Co | Liquid ring pump lobe purge |
DE3124867C2 (de) * | 1981-06-24 | 1983-11-17 | Siemens AG, 1000 Berlin und 8000 München | Flüssigkeitsring-Vakuumpumpe für gasförmige Medien |
JPS60149895U (ja) * | 1984-03-16 | 1985-10-04 | 富士電機株式会社 | 水封式ポンプの羽根車 |
JPS6237293A (ja) * | 1985-08-10 | 1987-02-18 | Kawasaki Heavy Ind Ltd | 推力発生装置 |
FI86333C (fi) * | 1988-04-11 | 1992-07-10 | Ahlstroem Oy | Foerfarande och anordning foer separering av gas med pumpen ur mediet som skall pumpas. |
JPH0698345B2 (ja) * | 1989-06-29 | 1994-12-07 | 三浦工業株式会社 | 脱酸素システムの制御装置 |
JPH0622152Y2 (ja) * | 1989-07-11 | 1994-06-08 | 三浦工業株式会社 | 多段水封式真空ポンプ |
JP2529222Y2 (ja) * | 1991-07-11 | 1997-03-19 | 三浦工業株式会社 | 水封式真空ポンプのインペラ |
DE19653746C2 (de) * | 1996-12-20 | 1999-05-06 | Siemens Ag | Laufrad für eine Flüssigkeitsringmaschine |
DE10142712B4 (de) * | 2001-08-31 | 2005-09-29 | Siemens Ag | Flügelzellenpumpe |
US6821099B2 (en) * | 2002-07-02 | 2004-11-23 | Tilia International, Inc. | Rotary pump |
US7425121B2 (en) * | 2004-03-25 | 2008-09-16 | Wood Gregory P | Rotary vane pump |
US7040940B2 (en) * | 2004-04-20 | 2006-05-09 | Ab Volvo | Rotatable lifting surface device having selected pitch distribution and camber profile |
DE602006002258D1 (de) * | 2006-05-11 | 2008-09-25 | Pompetravaini S P A | Einstufige Flüssigkeitsringvakuumpumpe mit Saug- und Druckleitungen im zentralen Gehäuse integriert. |
CN201047352Y (zh) * | 2007-05-28 | 2008-04-16 | 南京南汽汽车装备有限公司 | 适用于v型六缸发动机的冷却水泵 |
WO2010019891A2 (en) * | 2008-08-15 | 2010-02-18 | Deka Products Limited Partnership | Water vending apparatus |
US8998586B2 (en) * | 2009-08-24 | 2015-04-07 | David Muhs | Self priming pump assembly with a direct drive vacuum pump |
CN201650734U (zh) * | 2009-12-23 | 2010-11-24 | 博山精工泵业有限公司 | 复合型耐腐蚀水环式真空泵 |
-
2012
- 2012-11-21 US US14/359,395 patent/US20140286797A1/en not_active Abandoned
- 2012-11-21 CN CN201280057352.XA patent/CN104081004B/zh active Active
- 2012-11-21 MX MX2014006063A patent/MX351024B/es active IP Right Grant
- 2012-11-21 BR BR112014012096-0A patent/BR112014012096B1/pt active IP Right Grant
- 2012-11-21 WO PCT/EP2012/073150 patent/WO2013076107A2/de active Application Filing
- 2012-11-21 JP JP2014542804A patent/JP6151710B2/ja active Active
- 2012-11-21 EP EP12791749.0A patent/EP2783073B1/de active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10317010A1 (de) * | 2003-04-11 | 2004-11-04 | Schmitt-Kreiselpumpen Gmbh & Co. Kg | Wirbelpumpe |
Non-Patent Citations (1)
Title |
---|
ASV STÜBBE GMBH: "Magnetgekuppelte Kreiselpumpe Typ SHM", 12 September 2011 (2011-09-12), pages 1 - 8, XP055468269, Retrieved from the Internet <URL:http://www.bayerl.at/wp-content/uploads/2014/06/SHM_320358_DE1.pdf> [retrieved on 20180418] * |
Also Published As
Publication number | Publication date |
---|---|
BR112014012096B1 (pt) | 2021-09-21 |
WO2013076107A2 (de) | 2013-05-30 |
BR112014012096A8 (pt) | 2017-06-20 |
JP6151710B2 (ja) | 2017-06-21 |
MX351024B (es) | 2017-09-28 |
MX2014006063A (es) | 2015-02-10 |
US20140286797A1 (en) | 2014-09-25 |
EP2783073A2 (de) | 2014-10-01 |
BR112014012096A2 (pt) | 2017-06-13 |
CN104081004A (zh) | 2014-10-01 |
JP2014533803A (ja) | 2014-12-15 |
CN104081004B (zh) | 2018-02-27 |
WO2013076107A3 (de) | 2013-09-26 |
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