EP1308626B1 - Liquid ring pump - Google Patents
Liquid ring pump Download PDFInfo
- Publication number
- EP1308626B1 EP1308626B1 EP01126117A EP01126117A EP1308626B1 EP 1308626 B1 EP1308626 B1 EP 1308626B1 EP 01126117 A EP01126117 A EP 01126117A EP 01126117 A EP01126117 A EP 01126117A EP 1308626 B1 EP1308626 B1 EP 1308626B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- liquid ring
- pump
- ring pump
- groove
- 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.)
- Expired - Lifetime
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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
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C27/009—Shaft sealings specially adapted for pumps
-
- 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
Definitions
- the invention relates to a liquid ring pump with a Impeller in a cylindrical cavity of a housing rotates eccentrically, with one on an axial end face the impeller arranged control disc, the openings for Has supply and discharge of the conveying gas, the impeller on the other end face a closed ring Has end wall, and with one on this other side arranged mechanical seal applied with flushing liquid.
- the rinsing liquid that required for trouble-free functioning of the mechanical seal is from the liquid ring pump due to the suctioned the existing pressure difference.
- the accumulating Liquid forms the liquid ring of the liquid ring pump.
- From the pressure slot of the liquid ring pump the compressed medium is fed through a pressure line dissipated outside.
- the medium can be in a suitable location be returned to the process.
- the supply of the liquid ring pump with the operating fluid, in particular the flushing water of the mechanical seal is not for everyone Operating modes of the liquid ring pump ensured. In particular at low speeds it forms in the liquid ring pump not a stable liquid ring immediately out.
- the invention relates to a pump of the type mentioned Art (DE 42 29 017 A1).
- the object of the invention is to create a Liquid ring pump, even at low speed the formation of a sufficient liquid ring is ensured and with the gases also containing solid particles can be reliably pumped.
- the solution according to the invention is that in the end wall at least one arcuate radially curved to the circumference of the impeller directed groove is provided, the opposite Rotation direction seen, from the inside towards the circumference of the impeller runs.
- This groove is so aligned that during rotation the impeller an outward movement within the groove takes place.
- the depth of this groove is chosen so that the solids contained in the gas, in particular the paper fibers, outwards, i.e. back into the liquid ring be transported away.
- the pumping effect caused thereby the flushing water of the mechanical seal moves outwards, causing the formation of the liquid ring even at low Revolutions is effected. It also gets through this Pumping or flushing movement through the groove promoting the solid particles, especially the paper fibers are supported to the outside.
- the groove has the positive effect that it is a targeted flow direction in the axial gap between the impeller and housing causes.
- liquid ring pump according to the invention in combination to be used with a centrifugal pump, in particular for pumping paper pulp, is advantageously provided that the impeller on the pump shaft of the centrifugal pump is arranged. This is through a more compact Construction simplified the pump set. The one for the trouble-free The function of the necessary liquid ring pump is then integrated into the overall construction. With one of these solutions the liquid ring pump is behind on the pump shaft the centrifugal pump arranged. The advantage is obvious since the integration of the liquid ring pump only two requires additional main components. So that this constructive Execution but works reliably, are different to consider constructive details. So the control disc without valve construction for the pressure slot.
- the so-called built-in pressure ratio results from the size of the print slot, guaranteed about a wide suction pressure range acceptable flow rates.
- the liquid ring pump is arranged on the common pump shaft then it does not need its own shaft seal. Due to the compact arrangement, the liquid ring pump requires no external suction line, the flow paths are realized by built-in channels and column. The liquid ring pump sucks the air bubbles out of the pulp that collect behind the impeller of the centrifugal pump. To becomes the annulus behind the pump impeller of the centrifugal pump connected to the suction slot of the liquid ring pump.
- the pump impeller 2 of a centrifugal pump is on the pump shaft 1 arranged. This is also on the pump shaft 1 Impeller 3 of the liquid ring pump arranged. This rotates eccentric in a cylindrical space 4. With a Front side it is against a control disc 5, the one Has suction slot 6 and a pressure slot 7. When rotating of the impeller 3 forms on the circumference of the space 4 the liquid ring. Because the volume is between each Wings of the impeller 3 through the liquid ring is limited due to the eccentric arrangement during of the rotation changes, one arranged in the figure below Gas amount compressed upwards to a smaller volume and then leaves the pump through the pressure slot 7. It is sucked in with solid particles, especially paper fibers enriched air from the centrifugal pump the suction slot 6.
- the shaft 1 is against the housing 8 by a mechanical seal 9 sealed, the flushing liquid through a channel 10, especially rinse water is supplied.
- the impeller 3 On the control disc 5 opposite end face is the impeller 3 provided with a raised wall 11, the 8 directed surface with grooves running from the inside to the outside 12 is provided. These grooves are in particular spiral and cause a pumping action from the inside out the flushing liquid entering the mechanical seal 9 at 10 and for paper fibers that may have penetrated at this point.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Die Erfindung betrifft eine Flüssigkeitsringpumpe mit einem Flügelrad, das in einem zylindrischen Hohlraum eines Gehäuses exzentrisch rotiert, mit einer an einer axialen Stirnseite des Flügelrades angeordneten Steuerscheibe, die Öffnungen zum Zu- und Abführen des Fördergases aufweist, wobei das Flügelrad auf der anderen Stirnseite eine ringförmige geschlossene Stirnwand aufweist, und mit einer auf dieser anderen Seite angeordneten, mit Spülflüssigkeit beaufschlagten Gleitringdichtung.The invention relates to a liquid ring pump with a Impeller in a cylindrical cavity of a housing rotates eccentrically, with one on an axial end face the impeller arranged control disc, the openings for Has supply and discharge of the conveying gas, the impeller on the other end face a closed ring Has end wall, and with one on this other side arranged mechanical seal applied with flushing liquid.
In der Papier- und Zellstoffindustrie fördern spezielle große Zentrifugalpumpen den Papierbrei aus einem Standbehälter zur weiteren Verarbeitung. Der Papierbrei liegt in unterschiedlicher Konsistenz mit einem hohen Feststoffanteil vor. Die an den Fasern haftenden Luftblasen werden in der Pumpe aufgrund der großen Druckdifferenz abgeschieden. Entlang der Schaufeln folgen sie dem niedrigen Druck bis hinter das Pumpenlaufrad, wo der niedrigste Druck vorliegt. Für einen störungsfreien Betrieb muß die Luft an dieser Stelle mit einer Vakuumpumpe abgepumpt werden. Zu diesem Zweck wird in dem klassischen Entgasungssystem als Hilfsaggregat eine Flüssigkeitsringpumpe verwendet. Die Flüssigkeitsringpumpe saugt die Luft ab; gleichzeitig nimmt sie aus dem Gleitringdichtungsraum das Spülwasser auf.In the paper and pulp industry, special large convey Centrifugal pumps the paper pulp from a standing container further processing. The paper pulp is different Consistency with a high solid content. The on Air bubbles adhering to the fibers are caused in the pump the large pressure difference. Along the blades follow the low pressure to behind the pump impeller, where the lowest pressure is. For a trouble-free The air must be operated at this point with a vacuum pump be pumped out. For this purpose, the classic Degassing system as an auxiliary unit a liquid ring pump used. The liquid ring pump sucks the air out; at the same time it takes that out of the mechanical seal space Rinse water.
Zusammen mit den Luftblasen und dem Spülwasser gelangen auch Partikel des Papierbreis in den Saugstutzen der Flüssigkeitsringpumpe. Das gesamte angesaugte Medium, inklusive der Papierfasern, wird durch die Flüssigkeitsringpumpe gefördert und über den Druckstutzen abgeführt. Bei dem Fördervorgang durch die Flüssigkeitsringpumpe können sich die Fasern an scharfen Kanten und engen Querschnitten festsetzen, was zu Ausfällen und Betriebsstörungen führt. Zur Vermeidung derartiger Zwischenfälle wird beim Stand der Technik für die Flüssigkeitsringpumpe eine Sonderkonstruktion mit vergrößerten Spalten eingesetzt. Die vergrößerten Axialspalte befinden sich beidseitig des rotierenden Flügelrades, d.h. auf der Radvorderseite hin zur Steuerscheibe und auf der Radrückseite hin zum Gehäuse. Diese vergrößerten Axialspalte verringern zwar die Gefahr der Faseransammlung auf der Rückseite des Flügelrades. Die größeren Axialspalte haben aber auch die Auswirkung, daß die vergrößerte innere Rückströmung die Förderdaten der Flüssigkeitsringpumpe stark verschlechtern. Dabei ist auch zu berücksichtigen, daß in der Flüssigkeitsringpumpe das Fördergas vom Ansaugdruck auf einen höheren Druck verdichtet wird. Aufgrund des Druckanstiegs in den Flügelradzellen während einer Umdrehung des Flügelrades herrscht im Flüssigkeitsring über den Umfang verteilt unter jedem Winkel ein anderer Druck. Diese Druckverteilung bewirkt auf der Rückseite des Flügelrades eine Querströmung, die aus einem Gemisch von Betriebsflüssigkeit und des zu fördernden Gases besteht. Dieses in der Querströmung enthaltene Gas gelangt zurück zur Saugseite und vermindert so das Ansaugvolumen der Flüssigkeitsringpumpe.Together with the air bubbles and the rinse water also get Particles of the pulp in the suction port of the liquid ring pump. The entire medium sucked in, including the paper fibers, is promoted by the liquid ring pump and discharged through the pressure port. During the funding process Due to the liquid ring pump, the fibers can build up set sharp edges and narrow cross sections what to Failures and malfunctions. To avoid such Incidents occur in the prior art for the liquid ring pump a special construction with enlarged Columns used. The enlarged axial gaps are located on both sides of the rotating impeller, i.e. on the Front of the wheel towards the control disc and on the rear of the wheel towards the housing. Reduce these enlarged axial gaps although the risk of fiber accumulation on the back of the Impeller. The larger axial gaps also have them Impact that the increased internal backflow affects the production data of the liquid ring pump deteriorate significantly. there also take into account that in the liquid ring pump the conveying gas from the suction pressure to a higher pressure is compressed. Due to the pressure increase in the impeller cells during one revolution of the impeller Liquid ring distributed over the circumference at every angle another pressure. This pressure distribution causes on the Back of the impeller is a cross flow that comes from a Mixture of operating fluid and the gas to be pumped consists. This gas contained in the cross flow passes back to the suction side and thus reduces the suction volume of the Liquid ring pump.
Um die Lebensdauer der Gleitringdichtung zu verlängern, wird diese einer Fremdspülung ausgesetzt. Die Spülflüssigkeit, die für eine störungsfreie Funktion der Gleitringdichtung erforderlich ist, wird von der Flüssigkeitsringpumpe aufgrund der vorliegenden Druckdifferenz abgesaugt. Die sich ansammelnde Flüssigkeit bildet dabei den Flüssigkeitsring der Flüssigkeitsringpumpe. Vom Druckschlitz der Flüssigkeitsringpumpe wird das verdichtete Fördermedium über eine Druckleitung nach außen abgeführt. Das Medium kann an einer geeigneten Stelle in den Prozeß zurückgeführt werden. Die Versorgung der Flüssigkeitsringpumpe mit der Betriebsflüssigkeit, insbesondere dem Spülwasser der Gleitringdichtung ist aber nicht bei allen Betriebsweisen der Flüssigkeitsringpumpe sichergestellt. Insbesondere bei niedrigen Drehzahlen bildet sich in der Flüssigkeitsringpumpe nicht sofort ein stabiler Flüssigkeitsring aus.To extend the life of the mechanical seal this exposed to an external flush. The rinsing liquid that required for trouble-free functioning of the mechanical seal is from the liquid ring pump due to the suctioned the existing pressure difference. The accumulating Liquid forms the liquid ring of the liquid ring pump. From the pressure slot of the liquid ring pump the compressed medium is fed through a pressure line dissipated outside. The medium can be in a suitable location be returned to the process. The supply of the liquid ring pump with the operating fluid, in particular the flushing water of the mechanical seal is not for everyone Operating modes of the liquid ring pump ensured. In particular at low speeds it forms in the liquid ring pump not a stable liquid ring immediately out.
Die Erfindung geht aus von einer Pumpe der eingangs genannten Art (DE 42 29 017 A1).The invention relates to a pump of the type mentioned Art (DE 42 29 017 A1).
Die Aufgabe der Erfindung besteht in der Schaffung einer Flüssigkeitsringpumpe, bei der auch bei niedriger Drehzahl die Bildung eine ausreichenden Flüssigkeitsringes sichergestellt ist und mit der auch Feststoffteilchen enthaltende Gase zuverlässig gepumpt werden können.The object of the invention is to create a Liquid ring pump, even at low speed the formation of a sufficient liquid ring is ensured and with the gases also containing solid particles can be reliably pumped.
Die erfindungsgemäße Lösung besteht darin, daß in der Stirnwand mindestens eine bogenförmig radial gekrümmte zum Umfang des Flügelrades gerichtete Nut vorgesehen ist, die, entgegen Rotationsrichtung gesehen, von innen in Richtung zum Umfang des Flügelrades verläuft.The solution according to the invention is that in the end wall at least one arcuate radially curved to the circumference of the impeller directed groove is provided, the opposite Rotation direction seen, from the inside towards the circumference of the impeller runs.
Diese Nut ist also so ausgerichtet, daß während der Rotation des Flügelrades eine nach außen gerichtete Bewegung innerhalb der Nut stattfindet. Die Tiefe dieser Nut wird dabei so gewählt, daß die im Gas enthaltenen Feststoffe, also insbesondere die Papierfasern, nach außen, d.h. zurück in den Flüssigkeitsring wegtransportiert werden. Durch die nach außen gerichtete Nut und die dadurch bewirkte Pumpwirkung wird auch das Spülwasser der Gleitringdichtung nach außen bewegt, wodurch die Bildung des Flüssigkeitsringes auch bei niedrigen Umdrehungszahlen bewirkt wird. Außerdem wird durch diese Pump- bzw. Spülbewegung durch die Nut die Förderung der Feststoffpartikel, insbesondere die Papierfasern nach außen unterstützt. Die Nut hat also den positiven Effekt, daß sie eine gezielte Strömungsrichtung in dem Axialspalt zwischen Flügelrad und Gehäuse bewirkt. Aufgrund dieser Förderwirkung wird auch bei geringen Druckdifferenzen die Flüssigkeitsringstufe sicher mit Flüssigkeit, insbesondere mit Wasser versorgt. Dadurch hat sie immer eine ausreichend große Menge an Betriebsflüssigkeit. Der Axialspalt hinter dem Flügelrad kann enger ausgeführt werden, wodurch die inneren Rückströmungen in der Flüssigkeitsringpumpe reduziert werden. Dies führt zu einer Verbesserung der Förderdaten und zur Erhöhung der Betriebssicherheit. Die in der oben genannten Querströmung enthaltene Betriebsflüssigkeit ist bei dem Einsatz der Flüssigkeitsringpumpe zum Entgasen von Papierbrei aufgrund des Kontaktes mit dem Fördermedium mit Fasern aus dem Papierbrei angereichert. Diese Fasern können sich in dem Axialspalt auf der Radrückseite nicht mehr festsetzen und zu Störungen der Funktionsweise führen.This groove is so aligned that during rotation the impeller an outward movement within the groove takes place. The depth of this groove is chosen so that the solids contained in the gas, in particular the paper fibers, outwards, i.e. back into the liquid ring be transported away. Through the outside directional groove and the pumping effect caused thereby the flushing water of the mechanical seal moves outwards, causing the formation of the liquid ring even at low Revolutions is effected. It also gets through this Pumping or flushing movement through the groove promoting the solid particles, especially the paper fibers are supported to the outside. The groove has the positive effect that it is a targeted flow direction in the axial gap between the impeller and housing causes. Because of this promotional effect becomes the liquid ring stage even at low pressure differences safely supplied with liquid, especially water. As a result, she always has a sufficiently large amount Operating fluid. The axial gap behind the impeller can run closer, reducing the internal backflows be reduced in the liquid ring pump. this leads to an improvement of the funding data and to increase operational safety. The contained in the above cross flow Operating fluid is when using the liquid ring pump for degassing pulp due to contact enriched with the conveying medium with fibers from the pulp. These fibers can build up in the axial gap the rear of the wheel no longer fix and disturb the How it works.
Wenn die erfindungsgemäße Flüssigkeitsringpumpe in Kombination mit einer Zentrifugalpumpe verwendet werden soll, insbesondere zum Pumpen von Papierbrei, ist zweckmäßigerweise vorgesehen, daß das Flügelrad auf der Pumpenwelle der Zentrifugalpumpe angeordnet ist. Dadurch wird durch eine kompaktere Konstruktion das Pumpenaggregat vereinfacht. Die für die störungsfreie Funktion notwendige Flüssigkeitsringpumpe ist dann in die Gesamtkonstruktion integriert. Bei einer dieser Lösungen wird die Flüssigkeitsringpumpe auf der Pumpenwelle hinter der Zentrifugalpumpe angeordnet. Der Vorteil ist offensichtlich, da die Integration der Flüssigkeitsringpumpe nur zwei zusätzliche Hauptbauteile erfordert. Damit diese konstruktive Ausführung aber zuverlässig funktioniert, sind verschiedene konstruktive Details zu berücksichtigen. So wird die Steuerscheibe ohne Ventilkonstruktion für den Druckschlitz ausgeführt. Das sogenannte eingebaute Druckverhältnis, das sich aus der Größe des Druckschlitzes ergibt, gewährleistet über einen großen Ansaugdruckbereich akzeptable Förderströme. Da die Flüssigkeitsringpumpe auf der gemeinsamen Pumpenwelle angeordnet ist, benötigt sie dann keine eigene Wellenabdichtung. Durch die kompakte Anordnung benötigt die Flüssigkeitsringpumpe keine äußere Saugleitung, die Strömungswege werden durch eingebaute Kanäle und Spalte realisiert. Die Flüssigkeitsringpumpe saugt die Luftblasen aus dem Papierbrei, die sich hinter dem Laufrad der Zentrifugalpumpe sammeln, ab. Dazu wird der Ringraum hinter dem Pumpenlaufrad der Zentrifugalpumpe mit dem Saugschlitz der Flüssigkeitsringpumpe verbunden. If the liquid ring pump according to the invention in combination to be used with a centrifugal pump, in particular for pumping paper pulp, is advantageously provided that the impeller on the pump shaft of the centrifugal pump is arranged. This is through a more compact Construction simplified the pump set. The one for the trouble-free The function of the necessary liquid ring pump is then integrated into the overall construction. With one of these solutions the liquid ring pump is behind on the pump shaft the centrifugal pump arranged. The advantage is obvious since the integration of the liquid ring pump only two requires additional main components. So that this constructive Execution but works reliably, are different to consider constructive details. So the control disc without valve construction for the pressure slot. The so-called built-in pressure ratio results from the size of the print slot, guaranteed about a wide suction pressure range acceptable flow rates. There the liquid ring pump is arranged on the common pump shaft then it does not need its own shaft seal. Due to the compact arrangement, the liquid ring pump requires no external suction line, the flow paths are realized by built-in channels and column. The liquid ring pump sucks the air bubbles out of the pulp that collect behind the impeller of the centrifugal pump. To becomes the annulus behind the pump impeller of the centrifugal pump connected to the suction slot of the liquid ring pump.
Die Erfindung wird im folgenden anhand einer vorteilhaften Ausführungsform unter Bezugnahme auf die beigefügte Zeichnung beschrieben, die die erfindungsgemäße Flüssigkeitsringpumpe im Querschnitt zeigt.The invention is based on an advantageous Embodiment with reference to the accompanying drawings described the liquid ring pump according to the invention shows in cross section.
Auf der Pumpenwelle 1 ist das Pumpenlaufrad 2 einer Zentrifugalpumpe
angeordnet. Ebenfalls auf der Pumpenwelle 1 ist das
Flügelrad 3 der Flüssigkeitsringpumpe angeordnet. Dieses rotiert
exzentrisch in einem zylindrischen Raum 4. Mit einer
Stirnseite liegt es an einer Steuerscheibe 5 an, die einen
Saugschlitz 6 und einen Druckschlitz 7 aufweist. Bei der Rotation
des Flügelrades 3 bildet sich am Umfang des Raums 4
der Flüssigkeitsring. Da sich das Volumen zwischen den einzelnen
Flügeln des Flügelrades 3, das durch den Flüssigkeitsring
begrenzt wird, aufgrund der exzentrischen Anordnung während
der Rotation ändert, wird eine in der Figur unten angeordnete
Gasmenge nach oben hin auf ein kleineres Volumen komprimiert
und verläßt dann die Pumpe durch den Druckschlitz 7.
Angesaugt wird die mit Feststoffteilchen, insbesondere Papierfasern
angereicherte Luft von der Zentrifugalpumpe durch
den Saugschlitz 6.The
Die Welle 1 ist gegen das Gehäuse 8 durch eine Gleitringdichtung
9 abgedichtet, der durch einen Kanal 10 Spülflüssigkeit,
insbesondere Spülwasser zugeführt wird. An der der Steuerscheibe
5 gegenüberliegenden Stirnseite ist das Flügelrad 3
mit einer hochgezogenen Wand 11 versehen, deren zum Gehäuse 8
gerichtete Oberfläche mit von innen nach außen laufenden Nuten
12 versehen ist. Diese Nuten sind insbesondere spiralförmig
und bewirken eine Pumpwirkung von innen nach außen für
die bei 10 in die Gleitringdichtung 9 eintretende Spülflüssigkeit
und für eventuell an dieser Stelle eingedrungene Papierfasern.The
Claims (4)
- Liquid ring pump with an impeller (3), which rotates eccentrically in a cylindrical cavity of a housing (8), with a control disc (5) which is arranged at an axial end face of the impeller (3) and has openings (6, 7) for supplying and removing the carrier gas, the impeller having an annular closed end wall (11) on the other end face, and with a floating ring seal (9) on which flushing fluid impinges arranged on this other face, characterised in that at least one arc-shaped, radially curved groove (12) oriented towards the periphery of the impeller (3) is provided in the end wall (11), which groove, viewed in the opposite direction to the direction of rotation, runs from the inside towards the periphery of the impeller (3).
- Liquid ring pump according to Claim 1, characterised in that the groove(s) (12) is (are) in spiral form.
- Liquid ring pump according to Claim 2, characterised in that a multiform spiral groove (12) is provided.
- Liquid ring pump according to Claims 1 - 3, characterised in that the impeller (3) is fitted on the pump shaft (1) of another pump.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01126117A EP1308626B1 (en) | 2001-11-02 | 2001-11-02 | Liquid ring pump |
| DE50102618T DE50102618D1 (en) | 2001-11-02 | 2001-11-02 | Liquid ring pump |
| AT01126117T ATE269492T1 (en) | 2001-11-02 | 2001-11-02 | LIQUID RING PUMP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01126117A EP1308626B1 (en) | 2001-11-02 | 2001-11-02 | Liquid ring pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1308626A1 EP1308626A1 (en) | 2003-05-07 |
| EP1308626B1 true EP1308626B1 (en) | 2004-06-16 |
Family
ID=8179151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01126117A Expired - Lifetime EP1308626B1 (en) | 2001-11-02 | 2001-11-02 | Liquid ring pump |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1308626B1 (en) |
| AT (1) | ATE269492T1 (en) |
| DE (1) | DE50102618D1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486045B (en) * | 2013-10-16 | 2016-04-13 | 宁波爱发科真空技术有限公司 | The lubricating structure of Roots pump mechanical seal |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1781375A (en) * | 1929-09-03 | 1930-11-11 | Lucian F Easton | Rotary air pump |
| GB1509661A (en) * | 1976-02-11 | 1978-05-04 | Grayden Pty Ltd P | Water ring vacuum pumps |
| US5096396A (en) * | 1991-03-05 | 1992-03-17 | V. Q. Corporation | Rotary apparatus having passageways to clean seal chambers |
| DE4229017C2 (en) * | 1992-09-03 | 1995-05-24 | Sihi Gmbh & Co Kg | Liquid ring compressor in engine block or engine carrier design |
| SE504976C2 (en) * | 1995-09-07 | 1997-06-02 | Kvaerner Pulping Tech | Fiber pulp suspension pump with built-in vacuum pump |
-
2001
- 2001-11-02 EP EP01126117A patent/EP1308626B1/en not_active Expired - Lifetime
- 2001-11-02 DE DE50102618T patent/DE50102618D1/en not_active Expired - Lifetime
- 2001-11-02 AT AT01126117T patent/ATE269492T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE50102618D1 (en) | 2004-07-22 |
| ATE269492T1 (en) | 2004-07-15 |
| EP1308626A1 (en) | 2003-05-07 |
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