EP2783073A2 - Flüssigkeitsring-vakuumpumpe und flügelrad dafür - Google Patents
Flüssigkeitsring-vakuumpumpe und flügelrad dafürInfo
- Publication number
- EP2783073A2 EP2783073A2 EP12791749.0A EP12791749A EP2783073A2 EP 2783073 A2 EP2783073 A2 EP 2783073A2 EP 12791749 A EP12791749 A EP 12791749A EP 2783073 A2 EP2783073 A2 EP 2783073A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- liquid ring
- ring vacuum
- vacuum pump
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims description 39
- 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
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 4
- 229920001643 poly(ether ketone) Polymers 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
- -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
- 108090000623 proteins and genes Proteins 0.000 claims 1
- 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
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010974 bronze Substances 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
- 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
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
- Liquid ring vacuum pump and impeller for a liquid ring vacuum pump Liquid ring vacuum pump and impeller for a liquid ring vacuum pump
- the invention relates to a liquid-ring vacuum pump with a pump housing and an eccentrically mounted in the Pumpengekoru- se impeller.
- 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 space to be evacuated, the gas contained in the space is drawn in through the inlet opening, compressed in the pump and discharged again through an outlet opening.
- a fluid ring is held in motion by the impeller so that the chambers between the vanes' wings are closed by the fluid ring. Since the impeller is mounted eccentrically in the pump housing, the liquid ring penetrates different distances depending on the angular position of the impeller into the chamber and thereby acts as a piston which changes the volume of the chamber. Since all the force required for this is transmitted by the impeller, the impeller is a highly loaded component. In particular, the impeller is subject to a strong alternating load, as the force on the wings in different Directions is depending on whether the liquid ring moves into the chambers or moves out of the chambers.
- the impeller is subjected to several loads.
- the pressure load of the wings is particularly prominent.
- a strong pressure change is noted, which leads to an alternating load due to bending.
- high bending voltage stresses occur. These are further increased when condensate is conveyed. Due to the principle of cavitation can not be prevented in a liquid ring vacuum pump. Cavitation not only leads to damage to the surface, also occur in addition to the o.g. Loads further bending stress voltages.
- For the production of the impeller materials must be selected that can withstand these loads.
- the impeller In previous liquid ring vacuum pumps, the impeller consists mainly of metallic materials. So we find welded steel structures, gray cast iron wheels, wheels made of stainless steel or bronze. The elastic modulus of these materials is regularly greater than 100,000 N / mm 2 . Also impellers made of fiber reinforced plastics are known, CN 201650734. The modulus of elasticity is then of the order of 20,000 N / mm 2 . So far, it was such a matter of course for the expert that mechanically highly stressed components are made only of fiber-reinforced plastics and not of unreinforced plastics, that this was not even worth an explicit mention, cf. eg Faragallah WH: "Liquid ring vacuum pumps and compressors", January 1, 1985, Beltz Offsettik, page 187. In the selection of materials play especially the
- a disadvantage of high stiffness impellers is that the sudden loads experienced by the impeller during operation of the pump are transferred to other components of the pump substantially unfiltered. With sudden loads of the impeller is in particular to be expected when it comes to cavitation in the liquid ring. If the impeller has high rigidity, it is essential to avoid operating conditions where 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 potential efficiency.
- the invention is based on the object to present a liquid ring vacuum pump, in which the risk of damage caused by cavitation is reduced. Based on the aforementioned prior art, the object is achieved with the features of claim 1. According to the invention, the impeller of a material whose modulus of elasticity is smaller than 4000 N / mm 2 . Advantageous embodiments can be found in the subclaims.
- the invention thus proposes an impeller which deforms considerably more under the influence of forces than corresponding impellers made of classical materials. Due to its resilience, the material is suitable for yielding to the alternating load and the cavitation forces that occur, thereby reducing stresses.
- the invention has recognized that the associated disadvantages are offset by the improved resistance of the pump to cavitation. The sudden loads occurring during cavitation are cushioned by the impeller and not transferred unfiltered to the other components of the pump. This makes it possible to operate the pump closer to the cavitation limit without significantly reducing its service life. Operating near the cavitation limit increases the efficiency of the pump. Cavitation damage can also occur on the impeller itself. High local loads initially attack the surface. Then the damage can continue into the structure of the impeller.
- the impeller is made of a fiber-reinforced material.
- the surface is susceptible to initial damage. Cavitation bubbles can accumulate on these exposed fibers when cavitation occurs and lead to severe surface damage during imploding.
- the impeller therefore preferably consists of a non-fiber-reinforced material. It then results in a homogeneous surface, which has fewer points of attack for damage. Cost effective to manufacture, it is when the impeller is made of plastic. Unreinforced plastic materials also have the advantage that the noise emissions in cavitation operation are low, since unreinforced plastics have a good damping behavior.
- polyoxymethylene POM
- polyether ketones PEEK
- PA polyamides
- PET polybutylene terephthalate
- PC polycarbonates
- PPS polyphenylene sulfide
- the impeller is preferably provided with a hub, via which a conclusive connection with a shaft of the pump can be made.
- the shaft is eccentrically mounted in the pump housing while the hub is centered in the impeller.
- a plurality of wings extends radially outward. The number of wings may be between 10 and 20, for example.
- the chambers are open to allow the supply and removal of the gas to be delivered.
- the impeller adjoins a control disk of the pump, in which inlet openings and outlet openings are provided in suitable positions.
- the gap between the vanes and the control disk is kept as small as possible in order to minimize the leakage flow.
- the wings may be inclined relative to the axial direction, so that the impeller is pressed by the flow force in the direction of the control disk.
- the chambers are preferably completed.
- the impeller may for this purpose comprise a disc-shaped projection which extends so far radially outwardly from the hub, that the disc-shaped projection protrudes in the operation of the pump over its entire circumference in the liquid ring.
- the wings preferably protrude 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. From the hub, a plurality of wings extends radially outward. At one end, the wings are covered by at least half of their radial Warre- ckung by a disc-shaped projection.
- the impeller is made 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, wherein the plastic material is further preferably unreinforced.
- the impeller may be further developed with further features which are described above with reference to the pump according to the invention.
- Fig. 1 a schematic sectional view of a liquid ring vacuum pump according to the invention
- Fig. 2 the pump of Figure 1 in a side view.
- 3 shows a perspective view of an impeller according to the invention.
- an impeller 14 is mounted eccentrically in a pump housing 20. Liquid in the interior of the pump is carried by the impeller 14 in rotation and forms a liquid ring extending radially inwardly from the outer wall of the pump housing 20. Due to the eccentric storage see the wings of the impeller 14 depending on depending
- a channel leads into the interior of the pump, in which the impeller 14 rotates.
- the channel 16 opens in the area in which the wings of the impeller 14 emerge from the liquid ring, in which thus the enclosed between two wings chamber increases.
- gas is sucked through the inlet opening 16 into the chamber.
- the liquid ring penetrates the further rotation of the impeller 14 back into the chamber. If the gas is sufficiently compressed by the further penetrating liquid ring, it is discharged again through an outlet opening 17 at atmospheric pressure.
- 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 block construction, the drive and the impeller 14 are thus accommodated together in the pump housing 20.
- the drive 19 is supplied with electrical energy and set the speed of the pump.
- the impeller 14 has shown in FIG. 3 fifteen wings 23 which extend from a central hub 24 radially outward. Via the hub 24, the impeller 14 is connected to the shaft 18 of the pump.
- the wings 23 have a three-dimensional shape including a curvature with respect to the radial direction.
- the visible in Fig. 3 end face of the impeller 14 has in the installed state in the direction of the control disk of the pump.
- the arranged between each two wings 23 chambers 22 are thus open to the control disk, so that the gas to be supplied can be supplied and discharged through openings in the control disk.
- the impeller 14 has a disc-shaped projection 25 which extends radially outwards from the hub 24.
- the radial extent of the disk-shaped projection 25 is such that the disk-shaped projection 25 dips into the liquid ring over its entire circumference when the pump is in operation.
- the vanes 23 protrude somewhat beyond the disk-shaped projection 25 in the radial direction, so that an effective force transmission between the vanes 23 and the liquid ring is achieved.
- the impeller 14 is made in one piece from a non-fiber reinforced plastic material.
- the modulus of elasticity of the material is between 2000 N / mm 2 and 4000 N / mm 2 .
- the material is thus relatively flexible, so that sudden loads on the impeller can be partially absorbed by the material.
- the impeller Since the material is non-fiber reinforced, the impeller has a homogeneous surface. Even if high pressure and speed peaks occur locally as a result of cavitation in the operating fluid, the surface will withstand the stresses and damage to the impeller will not occur. Due to the impeller according to the invention, the liquid ring vacuum pump can be operated closer to the Kavitationsgrenze for these reasons, 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)
Abstract
Description
Claims
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 | ||
EP12791749.0A EP2783073B1 (de) | 2011-11-22 | 2012-11-21 | Flüssigkeitsring-vakuumpumpe und flügelrad dafür |
PCT/EP2012/073150 WO2013076107A2 (de) | 2011-11-22 | 2012-11-21 | Flüssigkeitsring-vakuumpumpe und flügelrad für eine flüssigkeitsring-vakuumpumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2783073A2 true EP2783073A2 (de) | 2014-10-01 |
EP2783073B1 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 (de) |
EP (1) | EP2783073B1 (de) |
JP (1) | JP6151710B2 (de) |
CN (1) | CN104081004B (de) |
BR (1) | BR112014012096B1 (de) |
MX (1) | MX351024B (de) |
WO (1) | WO2013076107A2 (de) |
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 |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE942107C (de) * | 1952-02-01 | 1956-04-26 | Siemens Ag | Laufrad fuer Fluessigkeitsringpumpen |
JPS4719677Y1 (de) * | 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 |
DE10317010A1 (de) * | 2003-04-11 | 2004-11-04 | Schmitt-Kreiselpumpen Gmbh & Co. Kg | Wirbelpumpe |
US7393192B2 (en) * | 2004-03-25 | 2008-07-01 | Gregory P Wood | Rotary vane pump |
US7040940B2 (en) * | 2004-04-20 | 2006-05-09 | Ab Volvo | Rotatable lifting surface device having selected pitch distribution and camber profile |
ATE404793T1 (de) * | 2006-05-11 | 2008-08-15 | 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 |
MX2011001778A (es) * | 2008-08-15 | 2011-05-10 | Deka Products Lp | Aparato expendedor de agua. |
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 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 EP EP12791749.0A patent/EP2783073B1/de active Active
- 2012-11-21 JP JP2014542804A patent/JP6151710B2/ja active Active
- 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 US US14/359,395 patent/US20140286797A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2013076107A2 * |
Also Published As
Publication number | Publication date |
---|---|
CN104081004A (zh) | 2014-10-01 |
MX351024B (es) | 2017-09-28 |
US20140286797A1 (en) | 2014-09-25 |
BR112014012096B1 (pt) | 2021-09-21 |
JP6151710B2 (ja) | 2017-06-21 |
WO2013076107A2 (de) | 2013-05-30 |
WO2013076107A3 (de) | 2013-09-26 |
EP2783073B1 (de) | 2020-05-27 |
CN104081004B (zh) | 2018-02-27 |
MX2014006063A (es) | 2015-02-10 |
BR112014012096A8 (pt) | 2017-06-20 |
JP2014533803A (ja) | 2014-12-15 |
BR112014012096A2 (pt) | 2017-06-13 |
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