EP2401504B1 - Liquid ring vacuum pump - Google Patents
Liquid ring vacuum pump Download PDFInfo
- Publication number
- EP2401504B1 EP2401504B1 EP10708492.3A EP10708492A EP2401504B1 EP 2401504 B1 EP2401504 B1 EP 2401504B1 EP 10708492 A EP10708492 A EP 10708492A EP 2401504 B1 EP2401504 B1 EP 2401504B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- liquid
- vacuum pump
- ring vacuum
- circuit
- 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.)
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- 239000007788 liquid Substances 0.000 title claims description 41
- 230000006835 compression Effects 0.000 claims description 31
- 238000007906 compression Methods 0.000 claims description 31
- 239000012535 impurity Substances 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 238000011109 contamination Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims 1
- 230000005494 condensation Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 23
- 239000012528 membrane Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005373 pervaporation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002699 waste material Substances 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
- F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply
Definitions
- the invention relates to a liquid ring vacuum pump for degassing plastic melts, with a pump inlet, are sucked at the gases and a pump outlet, are blown through the gases, and with a circuit for the compression fluid, in which a replaceable filter cartridge for filtering coarse impurities from the Compression fluid is provided, and optionally with a precondensation before the pump inlet for filtering fine impurities.
- Such liquid vacuum pumps are e.g. used for extruder degassing.
- contaminants such as Melt particles, etc.
- Both the toxic components of the gases and the impurities are largely absorbed by the compression fluid.
- the compression fluid in a circuit containing a replaceable filter cartridge, z. B. has a candle filter to clean.
- the disadvantage here is that when the candle filter is clogged after more or less long life, the circuit must be interrupted so that the candle filter can be changed.
- the impurities should condense out here. They deposit in the precondensation plant and must also be here from time to time be disposed of. Because of the high temperatures of the plastic melt gases, however, the impurities condense only with considerable effort, in particular cooling capacities, so that the known precondensation units only work dissatisfied and inadequate.
- the DE 296 15 006 U1 or the US 2006/0110261 A1 already disclose a circulation device for water ring pumps, are separated in the coarse impurities on an inclined plane of the compression liquid, fine impurities are filtered through a cylindrical, spherical or conical filter.
- the inclined plane and / or the filter have been added, the closed circuit must be opened and the impurities removed for the purpose of cleaning. Continuous operation is therefore just as impossible as the filtering of very fine contaminants.
- the DE 41 18 787 A1 discloses a process integrated operating fluid cleaning system for compressors in which by means of a pervaporation membrane module, the operating fluid of the compressor is cleaned.
- a membrane is used, through which the contaminated operating fluid can penetrate.
- the impurities evaporate on the back of the membrane.
- the membrane would become clogged. It would have to be exchanged. For this, the liquid ring vacuum pump would also have to be stopped and the otherwise closed loop for the compression fluid would have to be opened.
- the DE 1 908 692 A1 discloses a device for closed loop vacuum continuous filtration.
- the continuous filter proposed here works in a complex vacuum. Due to the necessary vacuum pumps and tanks such a continuous filter is very expensive.
- polyester melts are to be degassed, then in addition to the impurities, even toxic impurities, larger amounts of water are sucked in by the liquid ring vacuum pump. These quantities of water also pass into the compression fluid. This water must be removed from the circulation of the compression fluid. To ensure that this water does not have to be disposed of as hazardous waste, a particularly thorough cleaning of the compression fluid must be ensured.
- the invention is therefore based on the object to design a liquid ring vacuum pump so that it can continue to work continuously even with a filter change and the Kompressions remplikeitsniklauf need not be interrupted. Furthermore, the aim is that permanent stable process conditions arise, the handling of the filter system is simple and inexpensive and can be designed to be energy-saving and environmentally friendly.
- the compression fluid circuit only one, even during a change of a used filter surface arranged against a new or cleaned filter surface in a closed Kompressions remplikeitsniklauf, continuously operating fine and / or Feinstfilter also the Feinstfilter can of course cause the fine filtering with ,
- the fine filter is designed so that it even absorbs the toxic ingredients of the compression fluid, so that the expensive, and consuming to operate precondensation can be omitted.
- Kompressions remplikeitsniklauf ensures that no interruptions of the circuit and no stopping the liquid ring vacuum pump for a filter change are necessary.
- the continuous filter guarantees that when the filter surface in use threatens to clog, it is replaced by a new or cleaned filter surface.
- the filter may be a continuous-bed filter cloth using a hollow-bed filter or a back-flushable rotary or sliding filter.
- the filter cloth which emerges from the filter after the filter has been discharged, can be cleaned. But it is also possible to dispose of the filter cloth as hazardous waste and always provide a sufficient supply of new filter cloth.
- the ultrafine filters have filter finenesses ⁇ 5 ⁇ . If filters with filter finenesses> 5 ⁇ are used, it has been found that the coarse impurities and even finer suspended matter are separated from the compression fluid. With filter sizes ⁇ 5 ⁇ it is achieved that pollutants dissolved even in the compression fluid are filtered out of the compression fluid. Thus, from an environmental point of view, an optimal cleaning of the compression fluid can be achieved.
- the continuous filter is associated with a control device which, depending on and by monitoring the degree of contamination and / or the filter time and / or the pressure conditions on the filter and / or the flow rate conditions on the filter changing a used filter surface against a new or cleaned filter surface caused by further switching.
- a control device which, depending on and by monitoring the degree of contamination and / or the filter time and / or the pressure conditions on the filter and / or the flow rate conditions on the filter changing a used filter surface against a new or cleaned filter surface caused by further switching.
- an operator monitors the degree of contamination of the filter and manually causes a further switching of the filter elements.
- a connection to the liquid ring vacuum pump can be saved, whereby the liquid ring vacuum pump can be made smaller.
- a liquid separator is provided, which may be arranged outside of the liquid ring vacuum pump.
- the liquid ring vacuum pump is also particularly suitable for degassing polyester melts, in which the sucked gases have relatively large amounts of water.
- the invention will be explained in more detail with reference to a drawing.
- the figure shows a liquid ring vacuum pump 1 with a pump inlet 2 and a pump outlet 3.
- the liquid ring vacuum pump 1 is integrated into a circuit 4, in which the compression fluid is worked up.
- the circuit 4 has a continuously operating filter 5, the motor 6 exchanges the filter element 7 via an indicated control device 8 in response to the contamination of the filter element.
- the pump connection 3 is also designed as a connection of the circuit 4 at the same time.
- a liquid separator 9 the exhaust air is separated from the compression liquid, which from the liquid separator 9 for continuously working Filter 5 arrives.
- a cooling device 10 is provided, via which the compression fluid is brought to a desired level.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
Die Erfindung betrifft eine Flüssigkeitsring-Vakuumpumpe zum Entgasen von Kunststoffschmelzen, mit einem Pumpeneinlass, an dem Gase angesaugt werden und einem Pumpenauslass, über den Gase ausgeblasen werden, sowie mit einem Kreislauf für die Kompressionsflüssigkeit, in welchem ein auswechselbarer Filtereinsatz zum Filtern grober Verunreinigungen aus der Kompressionsflüssigkeit vorgesehen ist, und ggf. mit einer Vorkondensationsanlage vor dem Pumpeneinlass zum Filtern feiner Verunreinigungen.The invention relates to a liquid ring vacuum pump for degassing plastic melts, with a pump inlet, are sucked at the gases and a pump outlet, are blown through the gases, and with a circuit for the compression fluid, in which a replaceable filter cartridge for filtering coarse impurities from the Compression fluid is provided, and optionally with a precondensation before the pump inlet for filtering fine impurities.
Derartige Flüssigkeits-Vakuumpumpen werden z.B. zur Extruderentgasung eingesetzt. Beim Ansaugen der ggf. toxischen Gase können auch Verunreinigungen, wie z.B. Schmelzepartikel usw. mit angesaugt werden. Sowohl die toxischen Inhaltsstoffe der Gase, als auch die Verunreinigungen werden größtenteils von der Kompressionsflüssigkeit aufgenommen. Damit diese aufgenommenen, eventuell gröberen Schmutzpartikel in der Flüssigkeitsring-Vakuumpumpe keine Schäden verursachen, ist es bekannt, die Kompressionsflüssigkeit in einem Kreislauf, der einen auswechselbaren Filtereinsatz, z. B. einen Kerzenfilter aufweist, zu reinigen. Nachteilig ist dabei, dass, wenn der Kerzenfilter nach mehr oder wenig langer Standzeit verstopft ist, der Kreislauf unterbrochen werden muss, damit der Kerzenfilter gewechselt werden kann.Such liquid vacuum pumps are e.g. used for extruder degassing. When aspirating the possibly toxic gases, contaminants, such as Melt particles, etc. are sucked with. Both the toxic components of the gases and the impurities are largely absorbed by the compression fluid. In order for these recorded, possibly coarser dirt particles in the liquid ring vacuum pump cause no damage, it is known the compression fluid in a circuit containing a replaceable filter cartridge, z. B. has a candle filter to clean. The disadvantage here is that when the candle filter is clogged after more or less long life, the circuit must be interrupted so that the candle filter can be changed.
Grundsätzlich ist es auch bekannt, feinere Verunreinigungen wie z.B. die toxischen Inhaltsstoffe vor dem Pumpeneinlass mittels einer Vorkondensationsanlagen herauszufiltern. Die Verunreinigungen sollen hier auskondensieren. Sie lagern sich in der Vorkondensationsanlage ab und müssen auch hier von Zeit zu Zeit entsorgt werden. Wegen der hohen Temperaturen der Kunststoffschmelze-Gase kondensieren die Verunreinigungen jedoch nur mit einem erheblichen Aufwand, insbesondere an Kühlleistungen, so dass die bekannten Vorkondensationsanlagen nur unzufrieden und unzureichend arbeiten.Basically, it is also known to filter out finer impurities such as the toxic ingredients in front of the pump inlet by means of a precondensation. The impurities should condense out here. They deposit in the precondensation plant and must also be here from time to time be disposed of. Because of the high temperatures of the plastic melt gases, however, the impurities condense only with considerable effort, in particular cooling capacities, so that the known precondensation units only work dissatisfied and inadequate.
Sollen sowohl Grob- als auch Feinpartikel ausgeschieden werden, sind damit, wie z.B. durch die
Zum Reinigen der Vorkondensationsanlage werden oft zwei der kostenintensiven Kondensatoren vorgesehen; wobei der eine Kondensator im Betrieb sein kann, während der zweite Kondensator aufwändig z.B. mit Lösungsmitteln gereinigt werden muss und dessen Abfall dem Sondermüll zugeführt wird.To clean the precondensation often two of the costly capacitors are provided; wherein the one capacitor may be in operation, while the second capacitor is expensive, e.g. must be cleaned with solvents and its waste is added to the hazardous waste.
Die
Die
Die
Sollen Polyesterschmelzen entgast werden, so werden neben den Verunreinigungen, auch toxischen Verunreinigungen, größere Mengen Wassers von der Flüssigkeitsring-Vakuumpumpe angesaugt. Diese Wassermengen gehen ebenfalls in die Kompressionsflüssigkeit über. Dieses Wasser muss aus dem Kreislauf der Kompressionsflüssigkeit ausgeschleust werden. Damit dieses Wasser nicht ebenfalls als Sondermüll entsorgt werden muss, ist für eine besonders gründliche Reinigung der Kompressionsflüssigkeit Sorge zu tragen.If polyester melts are to be degassed, then in addition to the impurities, even toxic impurities, larger amounts of water are sucked in by the liquid ring vacuum pump. These quantities of water also pass into the compression fluid. This water must be removed from the circulation of the compression fluid. To ensure that this water does not have to be disposed of as hazardous waste, a particularly thorough cleaning of the compression fluid must be ensured.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Flüssigkeitsring-Vakuumpumpe so zu gestalten, dass diese auch bei einem Filterwechsel ununterbrochen weiterarbeiten kann und der Kompressionsflüssigkeitskreislauf nicht unterbrochen werden muss. Weiterhin ist angestrebt, dass dauerhafte stabile Prozessbedingungen entstehen, die Handhabung des Filtersystems einfach und kostengünstig ist sowie energieschonend und umweltverträglich gestaltet werden kann.The invention is therefore based on the object to design a liquid ring vacuum pump so that it can continue to work continuously even with a filter change and the Kompressionsflüssigkeitskreislauf need not be interrupted. Furthermore, the aim is that permanent stable process conditions arise, the handling of the filter system is simple and inexpensive and can be designed to be energy-saving and environmentally friendly.
Zur Lösung der Aufgabe wird vorgeschlagen, dass der Kompressionsflüssigkeitskreislauf nur einen, auch während eines Wechsels einer gebrauchten Filterfläche gegen eine neue oder gereinigte Filterfläche in einem geschlossen Kompressionsflüssigkeitskreislauf angeordneten, kontinuierlich arbeitenden Fein- und / oder Feinstfilter aufweist Auch der Feinstfilter kann selbstverständlich die Feinfilterung mit bewirken. Hinzu kommt, dass der Feinstfilter so ausgelegt ist, dass er sogar die toxischen Inhaltsstoffe der Kompressionsflüssigkeit aufnimmt, so dass die teuren, und aufwändig zu betreibenden Vorkondensationsanlagen entfallen können.To solve the problem it is proposed that the compression fluid circuit only one, even during a change of a used filter surface arranged against a new or cleaned filter surface in a closed Kompressionsflüssigkeitskreislauf, continuously operating fine and / or Feinstfilter also the Feinstfilter can of course cause the fine filtering with , In addition, the fine filter is designed so that it even absorbs the toxic ingredients of the compression fluid, so that the expensive, and consuming to operate precondensation can be omitted.
Der auch während eines Filterwechsels geschlossene Kompressionsflüssigkeitskreislauf gewährleistet, dass keine Unterbrechungen des Kreislaufes und kein Anhalten der Flüssigkeitsring-Vakuumpumpe für einen Filterwechsel notwendig werden. Der kontinuierlich arbeitende Filter garantiert dabei, dass, wenn die in Gebrauch befindliche Filterfläche zu verstopfen droht, durch eine neue bzw. gereinigte Filterfläche ersetzt wird.The closed even during a filter change Kompressionsflüssigkeitskreislauf ensures that no interruptions of the circuit and no stopping the liquid ring vacuum pump for a filter change are necessary. The continuous filter guarantees that when the filter surface in use threatens to clog, it is replaced by a new or cleaned filter surface.
Als Filter kann es sich um einen mit Endlosfliesfiltertuch arbeitenden Muldenbettfilter oder aber einen rückspülbaren Dreh- oder Schiebefilter handeln. Dabei kann das Filtertuch, welches nach erfolgter Filterleistung aus dem Filter austritt, gereinigt werden. Es besteht aber auch die Möglichkeit, das Filtertuch als Sondermüll zu entsorgen und stets für einen genügenden Vorrat an neuem Filtertuch zu sorgen.The filter may be a continuous-bed filter cloth using a hollow-bed filter or a back-flushable rotary or sliding filter. In this case, the filter cloth, which emerges from the filter after the filter has been discharged, can be cleaned. But it is also possible to dispose of the filter cloth as hazardous waste and always provide a sufficient supply of new filter cloth.
Es hat sich bewährt, dass die Feinstfilter Filterfeinheiten < 5 µ aufweisen. Werden Filter mit Filterfeinheiten > 5 µ verwendet, so hat sich ergeben, dass die groben Verunreinigungen und auch feinere Schwebstoffe aus der Kompressionsflüssigkeit getrennt werden. Bei Filtergrößen < 5 µ wird erreicht, dass selbst in der Kompressionsflüssigkeit gelöste Schadstoffe aus der Kompressionsflüssigkeit gefiltert werden. Damit lässt sich auch aus Umweltschutzgesichtspunkten eine optimale Reinigung der Kompressionsflüssigkeit erreichen.It has been proven that the ultrafine filters have filter finenesses <5 μ. If filters with filter finenesses> 5 μ are used, it has been found that the coarse impurities and even finer suspended matter are separated from the compression fluid. With filter sizes <5 μ it is achieved that pollutants dissolved even in the compression fluid are filtered out of the compression fluid. Thus, from an environmental point of view, an optimal cleaning of the compression fluid can be achieved.
Von Vorteil ist, dass dem kontinuierlich arbeitenden Filter eine Regelvorrichtung zugeordnet ist, welche in Abhängigkeit und durch Überwachen des Verschmutzungsgrades und / oder der Filterzeit und / oder der Druckverhältnisse am Filter und / oder der Strömungsgeschwindigkeitsverhältnisse am Filter den Wechsel einer gebrauchten Filterfläche gegen eine neue oder gereinigte Filterfläche durch Weiterschaltung bewirkt. Selbstverständlich besteht auch die Möglichkeit, dass ein Operateur den Verschmutzungsgrad des Filters überwacht und manuell eine Weiterschaltung der Filterelemente bewirkt.It is advantageous that the continuous filter is associated with a control device which, depending on and by monitoring the degree of contamination and / or the filter time and / or the pressure conditions on the filter and / or the flow rate conditions on the filter changing a used filter surface against a new or cleaned filter surface caused by further switching. Of course, there is also the possibility that an operator monitors the degree of contamination of the filter and manually causes a further switching of the filter elements.
Wenn einer der beiden Anschlüsse des Kreislaufes vom Pumpenauslass gebildet ist, lässt sich ein Anschluss an der Flüssigkeitsring-Vakuumpumpe einsparen, wodurch die Flüssigkeitsring-Vakuumpumpe kleiner gebaut werden kann. Um die Abluft von der Kompressionsflüssigkeit zu trennen, wird ein Flüssigkeitsabscheider vorgesehen, der außerhalb der Flüssigkeitsring-Vakuumpumpe angeordnet sein kann.If one of the two connections of the circuit is formed by the pump outlet, a connection to the liquid ring vacuum pump can be saved, whereby the liquid ring vacuum pump can be made smaller. In order to separate the exhaust air from the compression liquid, a liquid separator is provided, which may be arranged outside of the liquid ring vacuum pump.
Es hat sich bewährt, dass im geschlossenen Kreislauf eine Kühlvorrichtung vorgesehen ist. Diese bewirkt, dass die bei der Kompression des Gases in der Flüssigkeitsring-Vakuumpumpe auftretende Wärme problemlos abgeführt werden kann.It has been proven that a cooling device is provided in a closed circuit. This causes the heat occurring in the compression of the gas in the liquid ring vacuum pump can be dissipated easily.
Vorteilhaft ist, wenn als Kompressionsflüssigkeit Wasser verwendet wird. Dadurch ist ein besonders günstiger Betrieb der Flüssigkeitsring-Vakuumpumpe möglich.It is advantageous if water is used as the compression fluid. As a result, a particularly favorable operation of the liquid ring vacuum pump is possible.
Die Flüssigkeitsring-Vakuumpumpe eignet sich insbesondere auch dazu, Polyesterschmelzen zu entgasen, bei denen die angesaugten Gase verhältnismäßig große Wassermengen aufweisen.The liquid ring vacuum pump is also particularly suitable for degassing polyester melts, in which the sucked gases have relatively large amounts of water.
Die Erfindung wird anhand einer Zeichnung näher erläutert. Dabei zeigt die Figur eine Flüssigkeitsring-Vakuumpumpe 1 mit einem Pumpeneinlass 2 sowie einem Pumpenauslass 3. Die Flüssigkeitsring-Vakuumpumpe 1 ist in einen Kreislauf 4 eingebunden, in welchem die Kompressionsflüssigkeit aufgearbeitet wird. Der Kreislauf 4 weist einen kontinuierlich arbeitenden Filter 5 auf, dessen Motor 6 das Filterelement 7 über eine angedeutete Regelvorrichtung 8 in Abhängigkeit der Verschmutzung des Filterelements austauscht.The invention will be explained in more detail with reference to a drawing. The figure shows a liquid
Der Pumpenanschluss 3 ist auch gleichzeitig als Anschluss des Kreislaufs 4 ausgebildet. In einem Flüssigkeitsabscheider 9 wird die Abluft von der Kompressionsflüssigkeit getrennt, welche vom Flüssigkeitsabscheider 9 zum kontinuierlich arbeitenden Filter 5 gelangt. Weiterhin ist eine Kühlvorrichtung 10 vorgesehen, über welche die Kompressionsflüssigkeit auf ein gewünschtes Niveau gebracht wird.The
- 11
- Flüssigkeitsring-VakuumpumpeLiquid ring vacuum pump
- 22
- Pumpeneinlasspump inlet
- 33
- Pumpenauslasspump outlet
- 44
- Kreislaufcirculation
- 55
- Kontinuierlich arbeitender FilterContinuous filter
- 66
- Motorengine
- 77
- Filterelementfilter element
- 88th
- Regelelementcontrol element
- 99
- Flüssigkeitsabscheiderliquid separator
- 1010
- Kühlvorrichtungcooler
Claims (8)
- Liquid ring vacuum pump (1) for the degassing of plastics melts, having a pump inlet (2), at which gases are drawn in, and having a pump outlet (3), via which gases are discharged, and having a circuit (4) for the compression liquid, in which circuit there is provided an exchangeable filter insert for filtering coarse impurities out of the compression liquid, and possibly having a pre-condensation system upstream of the pump inlet (2) for the filtering of fine impurities,
characterized
in that the compression liquid circuit (4) has only one fine and/or ultrafine filter (5) which, even during an exchange of a used filter surface for a new or cleaned filter surface, is arranged and operates continuously in a closed compression liquid circuit (4), wherein the continuously operating filter (5) is assigned a control device (8) which, in a manner dependent on, and by monitoring of, the degree of contamination and/or the filtering time and/or the pressure conditions at the filter and/or the flow speed conditions at the filter, effect the change of a used filter surface for a new or cleaned filter surface by onward switching. - Liquid ring vacuum pump (1) according to Claim 1, characterized
in that the continuously operating filter (5) is a recessed bed filter which operates with a continuous nonwoven filter cloth. - Liquid ring vacuum pump (1) according to Claim 1,
characterized
in that the continuously operating filter (5) is a back-flushable rotary filter or disk filter. - Liquid ring vacuum pump (1) according to one of Claims 1 to 3,
characterized
in that the ultrafine filters (5) have filter finenesses of < 5 µ. - Liquid ring vacuum pump (1) according to one of Claims 1 to 4,
characterized
in that a connection of the circuit (4) is formed by the pump outlet (3), and in that, downstream of the pump outlet (3), there is connected a liquid separator (9) by means of which the exhaust air from the compression liquid is separated off and can be discharged, whereas the compression liquid is supplied to the circuit (4). - Liquid ring vacuum pump (1) according to one of Claims 1 to 5,
characterized
in that the circuit (4) has a cooling device (10). - Liquid ring vacuum pump (1) according to one of Claims 1 to 6,
characterized
in that water is used as compression liquid. - Liquid ring vacuum pump (1) according to one of Claims 1 to 7,
characterized
in that the plastics melts are polyester melts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009010702A DE102009010702A1 (en) | 2009-02-27 | 2009-02-27 | Liquid ring vacuum pump |
| PCT/EP2010/001205 WO2010097233A2 (en) | 2009-02-27 | 2010-02-26 | Liquid ring vacuum pump for degassing plastic melts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2401504A2 EP2401504A2 (en) | 2012-01-04 |
| EP2401504B1 true EP2401504B1 (en) | 2018-09-19 |
Family
ID=42371741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10708492.3A Active EP2401504B1 (en) | 2009-02-27 | 2010-02-26 | Liquid ring vacuum pump |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8608451B2 (en) |
| EP (1) | EP2401504B1 (en) |
| CN (1) | CN102333958B (en) |
| BR (1) | BRPI1009756B1 (en) |
| DE (1) | DE102009010702A1 (en) |
| TR (1) | TR201815888T4 (en) |
| WO (1) | WO2010097233A2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013211084A1 (en) * | 2013-06-14 | 2014-12-18 | Siemens Aktiengesellschaft | Method for operating a heat pump and heat pump |
| CN103480193B (en) * | 2013-09-27 | 2014-12-10 | 常熟市华能水处理设备有限责任公司 | Precision treater for condensed water |
| CN104295519A (en) * | 2014-10-17 | 2015-01-21 | 陕西科技大学 | Control device, water ring vacuum pump and control method thereof |
| FR3042236B1 (en) * | 2015-10-08 | 2019-09-06 | Ortec Expansion | METHOD AND DEVICE FOR PUMPING A PRODUCT BY SUCTION. |
| DE102016003428B4 (en) | 2016-03-21 | 2022-02-10 | Richard Bethmann | heat pump system |
| CN110354650A (en) * | 2019-07-30 | 2019-10-22 | 云南雷允上理想药业有限公司 | A kind of vacuum system dehumidifying unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US943908A (en) * | 1908-11-30 | 1909-12-21 | Frank Baily | Apparatus for straining liquids. |
| ES354847A1 (en) * | 1968-05-08 | 1969-11-01 | Bernardini Cost Mecc Spa | Procedure of continuous filtration in vacuum in closed circuit through the use of a rotary filter filter continues especially guided and washed. (Machine-translation by Google Translate, not legally binding) |
| US3574509A (en) * | 1969-02-14 | 1971-04-13 | Zurn Ind Inc | Backwash filter |
| US3664509A (en) * | 1969-11-04 | 1972-05-23 | Trw Inc | Fluids flow system with self-flushing revolving filter |
| DE2710445A1 (en) * | 1977-03-10 | 1978-09-14 | Peter Behr | Continuous drum filter - with wiper on slotted screen drum outside scraping residue in flushing gutter |
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| EP1794458A1 (en) | 2004-09-17 | 2007-06-13 | Basf Aktiengesellschaft | Method for operating a liquid ring compressor |
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2009
- 2009-02-27 DE DE102009010702A patent/DE102009010702A1/en not_active Withdrawn
-
2010
- 2010-02-26 BR BRPI1009756-2A patent/BRPI1009756B1/en active IP Right Grant
- 2010-02-26 CN CN201080010382.6A patent/CN102333958B/en active Active
- 2010-02-26 TR TR2018/15888T patent/TR201815888T4/en unknown
- 2010-02-26 WO PCT/EP2010/001205 patent/WO2010097233A2/en active Application Filing
- 2010-02-26 US US13/201,496 patent/US8608451B2/en active Active
- 2010-02-26 EP EP10708492.3A patent/EP2401504B1/en active Active
Non-Patent Citations (1)
| Title |
|---|
| None * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010097233A3 (en) | 2011-04-28 |
| EP2401504A2 (en) | 2012-01-04 |
| US20110300005A1 (en) | 2011-12-08 |
| BRPI1009756B1 (en) | 2020-09-15 |
| WO2010097233A2 (en) | 2010-09-02 |
| TR201815888T4 (en) | 2018-11-21 |
| US8608451B2 (en) | 2013-12-17 |
| BRPI1009756A2 (en) | 2016-03-15 |
| DE102009010702A1 (en) | 2010-09-02 |
| CN102333958B (en) | 2015-05-13 |
| CN102333958A (en) | 2012-01-25 |
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