EP0733805A1 - Fibres repelling wall-shape design - Google Patents

Fibres repelling wall-shape design Download PDF

Info

Publication number
EP0733805A1
EP0733805A1 EP96102053A EP96102053A EP0733805A1 EP 0733805 A1 EP0733805 A1 EP 0733805A1 EP 96102053 A EP96102053 A EP 96102053A EP 96102053 A EP96102053 A EP 96102053A EP 0733805 A1 EP0733805 A1 EP 0733805A1
Authority
EP
European Patent Office
Prior art keywords
centrifugal pump
depressions
pump according
depression
housing
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
Application number
EP96102053A
Other languages
German (de)
French (fr)
Other versions
EP0733805B1 (en
Inventor
Peer Springer
Roland Wellmeier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSB AG
Original Assignee
KSB AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KSB AG filed Critical KSB AG
Publication of EP0733805A1 publication Critical patent/EP0733805A1/en
Application granted granted Critical
Publication of EP0733805B1 publication Critical patent/EP0733805B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/005—Axial-flow pumps with a conventional single stage rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/548—Specially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/914—Device to control boundary layer

Definitions

  • the invention relates to a centrifugal pump according to the features in the preamble of the main claim.
  • Centrifugal pumps equipped with a propeller mainly have an axial flow direction, but in some cases semi-axial propellers with a corresponding flow direction are also used. Centrifugal pumps of this type are susceptible to foreign substances in the conveying medium, preferably foreign substances in the form of fibrous components.
  • DE-PS 501 662 attempted to eliminate this problem very early on. For this purpose, cutting edges were formed by inserts or by means of grooves in the housing. With their help, fibrous components should be stripped from the ends of the propeller blades.
  • FR-A-2 279 954 shows a solution that requires a special pump design.
  • a hub carrying the propeller shaft is passed through an inlet elbow on the inlet side.
  • the guide vanes downstream of the propeller are then designed as free-standing ribs fastened on one side.
  • the leading edge of these free-standing guide ribs are inclined in the direction of flow and fibers that are trapped thereon are rinsed into the free center of the flow cross-section and flow there unhindered.
  • a hub shell can be held by guide ribs, the leading wheel leading edges of which are filed back. Any fibers adhering to it slide into the outer area of the blades. Free-standing ribs precede these guide wheel leading edges. With help of these free-standing ribs, fibrous components of the delivery medium are to be grasped before reaching the actual guide vanes, slide along them inwards and slide off these ribs in the region of the hub.
  • This type of blades which make use of the principle of FR-A-2 279 954, represent an additional blockage of the stator cross section and can lead to the breakage of a free-standing rib in unfavorable operating conditions due to vibrational stress. In addition, they only partially offer security against constipation, since fibers can still accumulate on the actual guide vanes.
  • the invention is based on the problem of developing a stator design which prevents clogging of the stator when it is acted upon by a conveying medium containing fibrous components.
  • the depression in the housing ensures that fibers that accumulate on the inclined vane edges and slide along them slide over the free-standing vane part and thus enter the depression.
  • the depression creates a local vortex area above the stator leading edge, which exerts a lifting effect on the fibrous components.
  • the fibers in the depression are kept in suspension.
  • the adjoining flow in the stator channel in the area of the wall surfaces of the blades then exerts a transporting effect on the fibers within the depression.
  • the recess which can also be regarded as a type of housing pocket, deliberately produces dead water that represents a local backflow area. As a result of this local backflow area, it is ensured that the usually pressing effect of the dynamic pressure on the fibers is eliminated in the region of the transition from the stator to the housing between the guide vane and the housing.
  • Claims 2 to 8 describe further advantageous refinements of the invention.
  • the shape of a recess which can also be regarded as a type of housing pocket, which is described in claims 2 and 3, enables easy removal of the fiber that runs along the guide vane leading edges and over their free-standing vane edge into the space of Slide in the depression. From there they are transported into the space between two guide vanes. In order to intensify this effect, the edges of the depression in the suction-side flow space of the guide vane are beveled in relation to the housing. As a result, there is no dead water area here and the removal effect is enhanced.
  • An elongated course of the depression and also the oblique course of the depression with respect to the plane of rotation of the propeller have the effect that fibers which remain in the depression are flowed against asymmetrically.
  • the flow existing in the free channel cross-section, in conjunction with the fiber-dissolving effect of the dead water, causes the fibers to be transported away into the channel space between adjacent guide vanes.
  • the effect of the local backflow area existing within the depression can be influenced in a targeted manner.
  • a further influence on the formation of eddies within the depression is possible through the inclination course of the side walls.
  • No negative influence of the vortex formation within the depression on the flow in the free stator cross section could be determined.
  • this is due to the low absolute speeds in the outer area of a stator and the low partial volume flow detected by the depression.
  • the asymmetrical design of the depression also enables an asymmetrical distribution of the flows in the depression itself to be achieved, as a result of which the dissolving effect on the fibrous constituents accumulating therein is improved.
  • a pressure equalization above the stator blade caused by the deepening supports the detaching effect on the fibers. Practical tests have proven the advantageous effect of the design according to the invention in a most convincing manner, the overall efficiency of the unit not being adversely affected in any way.
  • rounded transitions in the area between the guide vane, depression and / or housing wall surface prevent the formation of sharp edges or corners. This will pinch fibrous Components prevented.
  • the invention shows a centrifugal pump, in the housing 1 of which an impeller in the form of a propeller 2 rotates, the flow through the pump in the axial direction.
  • the invention is not restricted to this flow direction, it can also be used in a semi-axial flow direction.
  • the propeller 2 is mounted in a hub 3, the hub 3 being positioned within the housing 1 by guide vanes 4.
  • the leading edges 5 of the guide vanes 4 are swept back or inclined in the direction of flow starting from the hub.
  • the guide vanes 4 protrude freely in the area of depressions 6 of the housing 1. Due to the inclination of the stator leading edge, adhering fibrous components will slide along it due to the acting flow and slide over the free-standing stator leading edge 7 into the recess 6. Depending on the flow conditions in the stator, the inclination can also run in a different direction and shape than shown. With leading edges 5 swept forward, the fibers would be guided to the hub 3. The depression would then be arranged in the hub 3.
  • the depressions 6 form, as it were, dead water, with the backflows therein causing turbulence, due to which the fibrous components are kept in suspension within a depression 6.
  • the area of the guide vanes 4 which is located behind a depression 6 in the direction of flow has transitions 8 which are to be regarded as profile thickenings. This avoids sharp-edged transitions between the guide vane 4 and the housing 1. In the worst case, sharp-edged transitions could cause the fibrous components to become stuck.
  • FIG. 3 corresponds to section B-B shown in FIG. 1. It contains a further cutting line C-C, which cuts off the bottom surface 12 of the recess 6 to a certain extent. 4, the recess can be represented as an opening.
  • the inclination of the side walls 11 of the recess 6 are carried out in accordance with the direction of flow of the pumped medium. This allows the removal of fibrous components from the recess 6 to be influenced in a targeted manner.
  • backflow vortices which form within the recess can exert their lifting effect on the fibrous components located in the recess and enable trouble-free pump operation.
  • FIG. 4 shows a section of a stator and corresponds to section CC of FIG. 3.
  • a top view of a stator blade 4 equipped with a recess is shown.
  • the selected course of the cut provides a look through the Indentation 6 possible on the associated guide vane.
  • the housing 1 and the hub 3 are only shown as cutouts.
  • the arrows shown indicate the course of the flow on both sides of the blade 4, above the free-standing stator leading edge 7, on the thickenings 8, 9 and in the region of the depression 6.
  • An overflow from the pressure side to the suction side of the guide vane takes place within the recess 6.
  • a dead water area 13 also forms in the area of the thickenings 8, 9, with the aid of which pressing of the fibrous components in this area of the depression is avoided.
  • the inclination of the wall surfaces 10, 11 can be seen here.
  • the almost vertical course of the wall surface 10 in the region of the guide vane 4 favors the positioning of backflow vortices on this zone, which causes the fibrous components to adhere firmly.
  • the greater inclination of the depression reduces the rinsing effect on the ends of the fibrous components.
  • the entrainment effect of the flow on the ends of the fibrous parts can be supported, which is facilitated by the lifting effect of all backflow vortices.
  • a spatial representation with the aid of grid surfaces shows the course of a depression 6 and its position relative to a leading-edge leading edge 5, 7.
  • the recess 6 was made open analogous to the section CC and the rounding was omitted.
  • the inclination or the asymmetrical assignment of recess 6 and guide vane 4 favors the lifting effect for the fibers in the region of the recess 6
  • Guide vanes are designed optimally in hydraulic terms and no longer need, as is also known, to be designed with flow-unfavorable thickenings in the region of their leading edges 5.

Abstract

The wall surface configuration is for a centrifugal pump with an impeller inside a casing, and stator vanes after the impeller shaped to deflect fibres. There are recesses (6) in the region of the stator vane leading edges (5). These recesses form a connection between the spaces on either side of the stator vane (4). The recesses may run lengthwise. They may extend in an angle to the rotation plane of the impeller. There may be a free standing edge (7) of the stator vane in the region of the recesses, which may be asymmetric relative to the stator vane and may have side walls at different angles.

Description

Die Erfindung betrifft eine Kreiselpumpe gemäß den Merkmalen im Oberbegriff des Hauptanspruches.The invention relates to a centrifugal pump according to the features in the preamble of the main claim.

Mit einem Propeller ausgestattete Kreiselpumpen weisen vorwiegend eine axiale Durchströmrichtung auf, zum Teil sind aber auch halbaxiale Propeller mit entsprechender Durchströmrichtung gebräuchlich. Derartige Kreiselpumpen sind anfällig gegen im Fördermedium befindliche Fremdstoffe, vorzugsweise Fremdstoffe in Form von faserigen Bestandteilen. Bereits sehr früh wurde dieses Problem durch die DE-PS 501 662 zu beseitigen versucht. Dazu wurden durch Einsätze oder mittels Nuten im Gehäuse Schneidkanten gebildet. Mit deren Hilfe sollten faserige Bestandteile von den Enden der Propellerflügel abgestreift werden.Centrifugal pumps equipped with a propeller mainly have an axial flow direction, but in some cases semi-axial propellers with a corresponding flow direction are also used. Centrifugal pumps of this type are susceptible to foreign substances in the conveying medium, preferably foreign substances in the form of fibrous components. DE-PS 501 662 attempted to eliminate this problem very early on. For this purpose, cutting edges were formed by inserts or by means of grooves in the housing. With their help, fibrous components should be stripped from the ends of the propeller blades.

Im Zusammenhang mit der Problematik der Ansammlung von Fasern an stillstehenden Leitschaufeln zeigt die FR-A- 2 279 954 eine Lösung, die eine besondere Pumpenbauform voraussetzt. Zu diesem Zweck wird eine die Propellerwelle tragende Nabe einlaufseitig durch einen Einlaufkrümmer hindurchgeführt. Dem Propeller nachgeordnete Leitschaufeln sind dann als einseitig befestigte, freistehende Rippen ausgebildet. Die Anströmkante dieser freistehenden Nachleitrippen verlaufen in Strömungsrichtung geneigt und sich daran vertangende Fasern werden in das freie Zentrum des Strömungsquerschnittes gespült und fließen dort ungehindert ab.In connection with the problem of the accumulation of fibers on stationary guide vanes, FR-A-2 279 954 shows a solution that requires a special pump design. For this purpose, a hub carrying the propeller shaft is passed through an inlet elbow on the inlet side. The guide vanes downstream of the propeller are then designed as free-standing ribs fastened on one side. The leading edge of these free-standing guide ribs are inclined in the direction of flow and fibers that are trapped thereon are rinsed into the free center of the flow cross-section and flow there unhindered.

Bei üblichen Pumpenbauarten jedoch, bei denen die Welle eines Propellers in einem dem Propeller nachgeordneten Nabengehäuse gelagert ist, sind andere Lösungen notwendig. Gemäß der EP-A- 0 512 190 kann ein Nabengehäuse durch Leitrippen gehalten werden, deren Leitrad-Anströmkanten zurückgefeilt sind. Eventuell daran anhaftende Fasern gleiten in den Außenbereich der Schaufeln. Diesen Leitrad-Anströmkanten sind freistehende Rippen vorangestellt. Mit Hilfe dieser freistehenden Rippen sollen faserige Bestandteile des Fördermediums vor Erreichen der eigentlichen Leitschaufeln erfaßt werden, daran entlang nach innen gleiten und im Bereich der Nabe von diesen Rippen abrutschen. Diese Art der Schaufeln, die vom Prinzip der FR-A- 2 279 954 Gebrauch machen, stellen eine zusätzliche Versperrung des Leitradquerschnittes dar und können bei ungünstigen Betriebszuständen infolge von Schwingungsbelastung zum Bruch einer freistehenden Rippe führen. Außerdem bieten sie nur teilweise eine Sicherheit gegen Verstopfung, da sich an den eigentlichen Leitschaufeln auch weiterhin Fasern ansammeln können.However, in the case of conventional pump types, in which the shaft of a propeller is mounted in a hub housing arranged downstream of the propeller, other solutions are necessary. According to EP-A-0 512 190, a hub shell can be held by guide ribs, the leading wheel leading edges of which are filed back. Any fibers adhering to it slide into the outer area of the blades. Free-standing ribs precede these guide wheel leading edges. With help of these free-standing ribs, fibrous components of the delivery medium are to be grasped before reaching the actual guide vanes, slide along them inwards and slide off these ribs in the region of the hub. This type of blades, which make use of the principle of FR-A-2 279 954, represent an additional blockage of the stator cross section and can lead to the breakage of a free-standing rib in unfavorable operating conditions due to vibrational stress. In addition, they only partially offer security against constipation, since fibers can still accumulate on the actual guide vanes.

Der Erfindung liegt das Problem zugrunde, eine Leitradgestaltung zu entwickeln, die bei Beaufschlagung mit einem faserige Bestandteile enthaltenden Fördermedium ein Verstopfen des Leitrades unterbindet.The invention is based on the problem of developing a stator design which prevents clogging of the stator when it is acted upon by a conveying medium containing fibrous components.

Die Lösung dieser Aufgabe erfolgt mit den Merkmalen des Anspruches 1. Durch die Vertiefung im Gehäuse wird erreicht, daß an den geneigten Leitschaufelkanten sich ansammelnde und daran entlanggleitende Fasern über den freistehenden Schaufelteil hinwegrutschen und so in die Vertiefung gelangen. Über der Leitradeintrittskante erzeugt die Vertiefung durch die Querschnittsvergrößerung ein lokales Wirbelgebiet, welches auf die faserigen Bestandteile eine abhebende Wirkung ausübt. Mit Hilfe dieser Wirbel werden die Fasern in der Vertiefung in der Schwebe gehalten. Die angrenzende Strömung im Leitradkanal im Bereich der Wandflächen der Schaufeln übt dann eine abtransportierende Wirkung auf die Fasern innerhalb der Vertiefung aus. Gewissermaßen wird durch die Vertiefung, die auch als eine Art Gehäusetasche angesehen werden kann, gezielt ein Totwasser erzeugt, welches ein lokales Rückströmgebiet darstellt. Infolge dieses lokalen Rückströmgebietes wird sichergestellt, daß die üblicherweise anpressende Wirkung des Staudruckes auf die Fasern im Bereich des Überganges vom Leitrad zum Gehäuse zwischen Leitschaufel und Gehäuse aufgehoben wird.This object is achieved with the features of claim 1. The depression in the housing ensures that fibers that accumulate on the inclined vane edges and slide along them slide over the free-standing vane part and thus enter the depression. Through the enlargement of the cross section, the depression creates a local vortex area above the stator leading edge, which exerts a lifting effect on the fibrous components. With the help of these vortices, the fibers in the depression are kept in suspension. The adjoining flow in the stator channel in the area of the wall surfaces of the blades then exerts a transporting effect on the fibers within the depression. To a certain extent, the recess, which can also be regarded as a type of housing pocket, deliberately produces dead water that represents a local backflow area. As a result of this local backflow area, it is ensured that the usually pressing effect of the dynamic pressure on the fibers is eliminated in the region of the transition from the stator to the housing between the guide vane and the housing.

Die Ansprüche 2 bis 8 beschreiben weitere vorteilhafte Ausgestaltungen der Erfindung. Die Form einer Vertiefung, die auch als eine Art Gehäusetasche angesehen werden kann, die in den Ansprüchen 2 und 3 beschrieben ist, ermöglicht einen problemlosen Abtransport derjenigen Faser, die entlang der Leitschaufel-Anströmkanten und über deren freistehende Schaufelkante in den Raum der Vertiefung hineingleiten. Von dort werden sie in den Raum zwischen zwei Leitschaufeln abtransportiert. Um diesen Effekt zu verstärken, werden die Kanten der Vertiefung im saugseitigen Strömungsraum der Leitschaufel gegenüber dem Gehäuse abgeschrägt. Als Ergebnis entsteht hier kein Totwassergebiet und die abtransportierende Wirkung wird verstärkt. Ein länglicher Verlauf der Vertiefung und auch der schräge Verlauf der Vertiefung in bezug auf die Rotationsebene des Propellers bewirken, daß Fasern, die in der Vertiefung hängen bleiben, asymmetrisch angeströmt werden. Die im freien Kanalquerschnitt existierende Strömung bewirkt in Verbindung mit der faserlösenden Wirkung des Totwassers einen Abtransport der Fasern in den Kanalraum zwischen benachbarten Leitschaufeln.Claims 2 to 8 describe further advantageous refinements of the invention. The shape of a recess, which can also be regarded as a type of housing pocket, which is described in claims 2 and 3, enables easy removal of the fiber that runs along the guide vane leading edges and over their free-standing vane edge into the space of Slide in the depression. From there they are transported into the space between two guide vanes. In order to intensify this effect, the edges of the depression in the suction-side flow space of the guide vane are beveled in relation to the housing. As a result, there is no dead water area here and the removal effect is enhanced. An elongated course of the depression and also the oblique course of the depression with respect to the plane of rotation of the propeller have the effect that fibers which remain in the depression are flowed against asymmetrically. The flow existing in the free channel cross-section, in conjunction with the fiber-dissolving effect of the dead water, causes the fibers to be transported away into the channel space between adjacent guide vanes.

Mittels einer Asymmetrie zwischen den freistehenden Schaufelanströmkanten und den zugehörigen Vertiefungen kann die Wirkung des innerhalb der Vertiefung bestehenden lokalen Rückströmgebietes gezielt beeinflußt werden. Eine weitere Beeinflussung der Wirbelbildung innerhalb der Vertiefung ist durch den Neigungsverlauf der Seitenwände möglich. Es konnte kein negativer Einfluß der Wirbelbildung innerhalb der Vertiefung auf die Strömung im freien Leitradquerschnitt festgestellt werden. Zum einen ist dies bedingt durch die geringen Absolutgeschwindigkeiten im äußeren Bereich eines Leitrades sowie des geringen von der Vertiefung erfaßten Teilvolumenstromes. Desweiteren ist durch die asymmetrische Gestaltung der Vertiefung auch eine asymmetrische Verteilung der Strömungen in der Vertiefung selbst erreichbar, wodurch die lösende Wirkung auf die sich darin ansammelnden faserigen Bestandteile verbessert wird. Ein durch die Vertiefung auch bewirkter Druckausgleich oberhalb der Leitradschaufel unterstützt die ablösende Wirkung auf die Fasern. Praktische Versuche haben die vorteilhafte Wirkung der erfindungsgemäßen Gestaltung in überzeugendster Weise bewiesen, wobei der Gesamtwirkungsgrad des Aggregates in keiner Weise negativ beeinflußt wurde.By means of an asymmetry between the free-standing blade leading edges and the associated depressions, the effect of the local backflow area existing within the depression can be influenced in a targeted manner. A further influence on the formation of eddies within the depression is possible through the inclination course of the side walls. No negative influence of the vortex formation within the depression on the flow in the free stator cross section could be determined. On the one hand, this is due to the low absolute speeds in the outer area of a stator and the low partial volume flow detected by the depression. Furthermore, the asymmetrical design of the depression also enables an asymmetrical distribution of the flows in the depression itself to be achieved, as a result of which the dissolving effect on the fibrous constituents accumulating therein is improved. A pressure equalization above the stator blade caused by the deepening supports the detaching effect on the fibers. Practical tests have proven the advantageous effect of the design according to the invention in a most convincing manner, the overall efficiency of the unit not being adversely affected in any way.

Nach einer anderen Ausgestaltung verhindern abgerundete Übergänge im Bereich zwischen Leitschaufel, Vertiefung und/oder Gehäusewandfläche die Bildung von scharfen Kanten bzw. Ecken. Damit wird ein Einklemmen von faserigen Bestandteilen verhindert. Zwischen den Schaufeln und den Gehäuseseitenwänden bestehen sanfte Übergänge, wobei entsprechende Übergänge auch im Bereich zwischen Vertiefung und Leitschaufel zu finden sind.According to another embodiment, rounded transitions in the area between the guide vane, depression and / or housing wall surface prevent the formation of sharp edges or corners. This will pinch fibrous Components prevented. There are smooth transitions between the blades and the housing side walls, with corresponding transitions also to be found in the area between the depression and the guide vane.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher beschrieben. Dabei zeigen die

Fig. 1
einen Meridianschnitt mit Meridionalprojektion der Schaufeln, die
Fig. 2
einen Schnitt gemäß Linie AA aus Fig. 1, die
Fig. 3
einen Schnitt gemäß Linie BB von Fig. 1, die
Fig. 4
einen Schnitt gemäß Linie CC von Fig. 3 und die
Fig. 5
eine räumliche Darstellung mit Hilfe von Gitternetzlinien.
An embodiment of the invention is shown in the drawings and will be described in more detail below. The show
Fig. 1
a meridian section with meridional projection of the blades, the
Fig. 2
a section along line AA of FIG. 1, the
Fig. 3
a section along line BB of Fig. 1, the
Fig. 4
a section along line CC of Fig. 3 and
Fig. 5
a spatial representation with the help of grid lines.

In der Fig. 1 ist eine Kreiselpumpe dargestellt, in deren Gehäuse 1 ein Laufrad in Form eines Propeller 2 rotiert, wobei die Pumpe in axialer Richtung durchströmt wird. Die Erfindung ist nicht auf diese Strömungsrichtung beschränkt, sie kann genausogut auch bei einer halbaxialen Durchströmrichtung Verwendung finden. Der Propeller 2 ist in einer Nabe 3 gelagert, wobei die Nabe 3 durch Leitschaufeln 4 innerhalb des Gehäuses 1 positioniert ist. Die Anströmkanten 5 der Leitschaufeln 4 sind hierbei zurückgepfeilt bzw. ausgehend von der Nabe in Strömungsrichtung zurückgeneigt. Im Bereich von Vertiefungen 6 des Gehäuses 1 stehen die Leitschaufeln 4 frei hervor. Durch die Neigung der Leitrad-Anströmkanten werden anhaftende faserige Bestandteile infolge der einwirkenden Strömung daran entlanggleiten und über die freistehende Leitradeintrittskante 7 in die Vertiefung 6 gleiten. Entsprechend den Strömungsverhältnissen im Leitrad kann die Neigung auch in anderer als der dargestellten Richtung und Form verlaufen. Bei vorwärts gepfeilten Anströmkanten 5 würden die Fasern zur Nabe 3 geführt werden. Die Vertiefung wäre dann in der Nabe 3 angeordnet.1 shows a centrifugal pump, in the housing 1 of which an impeller in the form of a propeller 2 rotates, the flow through the pump in the axial direction. The invention is not restricted to this flow direction, it can also be used in a semi-axial flow direction. The propeller 2 is mounted in a hub 3, the hub 3 being positioned within the housing 1 by guide vanes 4. The leading edges 5 of the guide vanes 4 are swept back or inclined in the direction of flow starting from the hub. The guide vanes 4 protrude freely in the area of depressions 6 of the housing 1. Due to the inclination of the stator leading edge, adhering fibrous components will slide along it due to the acting flow and slide over the free-standing stator leading edge 7 into the recess 6. Depending on the flow conditions in the stator, the inclination can also run in a different direction and shape than shown. With leading edges 5 swept forward, the fibers would be guided to the hub 3. The depression would then be arranged in the hub 3.

Die Vertiefungen 6 bilden gewissermaßen ein Totwasser, wobei darin befindliche Rückströmungen Verwirbelungen hervorrufen, aufgrund dessen die faserigen Bestandteile innerhalb einer Vertiefung 6 in der Schwebe gehalten werden. Derjenige Bereich der Leitschaufeln 4, der in Strömungsrichtung hinter einer Vertiefung 6 befindlich ist, weist Übergänge 8 auf, die als Profilverdickungen anzusehen sind. Damit werden scharfkantige Übergänge zwischen Leitschaufel 4 und Gehäuse 1 vermieden. Scharfkantige Übergänge könnten ungünstigenfalls zu einem Festklemmen der faserigen Bestandteile führen.The depressions 6 form, as it were, dead water, with the backflows therein causing turbulence, due to which the fibrous components are kept in suspension within a depression 6. The area of the guide vanes 4 which is located behind a depression 6 in the direction of flow has transitions 8 which are to be regarded as profile thickenings. This avoids sharp-edged transitions between the guide vane 4 and the housing 1. In the worst case, sharp-edged transitions could cause the fibrous components to become stuck.

In der Darstellung der Fig. 2, einem Schnitt gemäß Linie A-A von Fig. 1, ist die Lage einer Vertiefung 6 zu einer Leitschaufel 4 erkennbar. An einer Schaufelanströmkante anhaftende faserige Bestandteile gleiten in die Vertiefung 6, die sich in dem Ausführungsbeispiel unterhalb der Zeichnungsebene erstreckt. Zwischen Leitschaufel 4 und Gehäuse 1 befindliche Übergänge 8, 9 verhindern die Bildung von scharfen Kanten im Bereich zwischen Leitschaufel 4, Gehäuse 1 und Vertiefung 6. Der innerhalb der Vertiefung 6 befindliche Übergang 9 hat in Bezug auf die Seitenwand 10 die Form eines Wandvorsprunges. Die Seitenwand 11 der Vertiefung 6 hat eine andere Neigung, als die gegenüberliegende Seitenwand 10. Mit Hilfe der Seitenwandneigungen ist eine Beeinflussung der Wirbelbildung innerhalb der Vertiefung 6 möglich. Die ablösende Wirkung auf innerhalb der Vertiefung sich ansammelnde faserige Bestandteile kann so beeinflußt werden.2, a section along line A-A of FIG. 1, the position of a depression 6 relative to a guide vane 4 can be seen. Fibrous components adhering to a blade leading edge slide into the recess 6, which in the exemplary embodiment extends below the plane of the drawing. Transitions 8, 9 located between the guide vane 4 and the housing 1 prevent the formation of sharp edges in the area between the guide vane 4, the housing 1 and the depression 6. The transition 9 located within the depression 6 has the shape of a wall projection with respect to the side wall 10. The side wall 11 of the recess 6 has a different inclination than the opposite side wall 10. With the aid of the side wall inclinations, it is possible to influence the formation of eddies within the recess 6. The detaching effect on fibrous constituents accumulating within the depression can thus be influenced.

Die Fig. 3 entspricht dem in Fig. 1 eingezeichneten Schnitt B-B. Sie enthält eine weitere Schnittlinie C-C, die die Bodenfläche 12 der Vertiefung 6 gewissermaßen abschneidet. Durch diesen Schnittverlauf wird in der Fig. 4 die Vertiefung als Öffnung darstellbar. Die Neigung der Seitenwände 11 der Vertiefung 6 sind entsprechend der Strömungsrichtung des Fördermediums ausgeführt. Dies erlaubt eine gezielte Beeinflussung des Abtransportes von faserigen Bestandteilen aus der Vertiefung 6. Somit können innerhalb der Vertiefung sich ausbildende Rückströmwirbel ihre abhebende Wirkung auf die in der Vertiefung befindlichen faserigen Bestandteile ausüben und einen störungsfreien Pumpenbetrieb ermöglichen.FIG. 3 corresponds to section B-B shown in FIG. 1. It contains a further cutting line C-C, which cuts off the bottom surface 12 of the recess 6 to a certain extent. 4, the recess can be represented as an opening. The inclination of the side walls 11 of the recess 6 are carried out in accordance with the direction of flow of the pumped medium. This allows the removal of fibrous components from the recess 6 to be influenced in a targeted manner. Thus, backflow vortices which form within the recess can exert their lifting effect on the fibrous components located in the recess and enable trouble-free pump operation.

Die Fig. 4 zeigt einen Ausschnitt aus einem Leitrad und entspricht dem Schnitt C-C von Fig. 3. Es ist eine Draufsicht auf eine mit einer Vertiefung ausgestatteten Leitschaufel 4 gezeigt. Durch den gewählten Schnittverlauf wird ein Blick durch die Vertiefung 6 hindurch auf die zugehörige Leitschaufel möglich. Das Gehäuse 1 und die Nabe 3 sind nur als Ausschnitte dargestellt. Die eingezeichneten Pfeile zeigen den Verlauf der Strömung beiderseits der Schaufel 4, oberhalb der freistehenden Leitradeintrittskante 7, an den Verdickungen 8, 9 und im Bereich der Vertiefung 6 an. Innerhalb der Vertiefung 6 findet ein Überströmen von der Druckseite zur Saugseite der Leitschaufel statt. Desweiteren bildet sich auch im Bereich der Verdickungen 8, 9 ein Totwassergebiet 13 aus, mit dessen Hilfe ein Anpressen der faserigen Bestandteile in diesem Bereich der Vertiefung vermieden wird. Sollten faserige Bestandteile in die Vertiefung 6 hineinrutschen, dann würden deren Enden in den freien Strömungsquerschnitt der Leitradkanäle 14, 15 hineinragen. Aufgrund einer fehlenden Anpressung innerhalb der Vertiefung 6 werden sie vom vorbeiströmenden Fördermedium erfaßt, mitgerissen und abtransportiert. Der gezeigte Verlauf der länglichen Vertiefung 6, deren Lage zur Leitschaufel 4 hier asymmetrisch ist, unterstützt die abtransportierende Wirkung des Fördermediums auf die faserigen Bestandteile. Anhand der Linie 16, welche der Öffnung der Vertiefung 6 in der Wandfläche des Gehäuses 1 entspricht, und der Linie 12.1, welche der Bodenfläche 12 der Vertiefung 6 entspricht, läßt sich der Verlauf der Neigung der Wandflächen 10, 11 der Vertiefung 6 erkennen. Ähnlich wie die Höhenlinien in einer Landkarte ist hier die Neigung der Wandflächen 10, 11 erkennbar. Der nahezu senkrechte Verlauf der Wandfläche 10 im Bereich der Leitschaufel 4 begünstigt die Positionierung von Rückströmwirbeln an dieser, ein Festhaften der faserigen Bestandteile bewirkenden Zone. Im gegenüberliegenden Bereich, an der Wandfläche 11 verringert die stärkere Neigung der Vertiefung die abspülende Wirkung auf die Enden der faserigen Bestandteile. Somit kann der Mitnahmeeffekt der Strömung auf die Enden der faserigen Teile unterstützt werden, welches durch den Abhebeeffekt aller Rückströmwirbel erleichtert wird.FIG. 4 shows a section of a stator and corresponds to section CC of FIG. 3. A top view of a stator blade 4 equipped with a recess is shown. The selected course of the cut provides a look through the Indentation 6 possible on the associated guide vane. The housing 1 and the hub 3 are only shown as cutouts. The arrows shown indicate the course of the flow on both sides of the blade 4, above the free-standing stator leading edge 7, on the thickenings 8, 9 and in the region of the depression 6. An overflow from the pressure side to the suction side of the guide vane takes place within the recess 6. Furthermore, a dead water area 13 also forms in the area of the thickenings 8, 9, with the aid of which pressing of the fibrous components in this area of the depression is avoided. Should fibrous constituents slip into the recess 6, then their ends would protrude into the free flow cross section of the stator channels 14, 15. Due to a lack of pressure within the recess 6, they are caught by the flowing medium, carried along and transported away. The course of the elongated recess 6 shown, the position of which is asymmetrical in relation to the guide vane 4, supports the removal effect of the conveying medium on the fibrous components. Using the line 16, which corresponds to the opening of the recess 6 in the wall surface of the housing 1, and the line 12.1, which corresponds to the bottom surface 12 of the recess 6, the course of the inclination of the wall surfaces 10, 11 of the recess 6 can be seen. Similar to the contour lines in a map, the inclination of the wall surfaces 10, 11 can be seen here. The almost vertical course of the wall surface 10 in the region of the guide vane 4 favors the positioning of backflow vortices on this zone, which causes the fibrous components to adhere firmly. In the opposite area, on the wall surface 11, the greater inclination of the depression reduces the rinsing effect on the ends of the fibrous components. Thus, the entrainment effect of the flow on the ends of the fibrous parts can be supported, which is facilitated by the lifting effect of all backflow vortices.

Aus der Fig. 5, einer räumlichen Darstellung mit Hilfe von Gitternetzflächen, ist der Verlauf einer Vertiefung 6 und deren Position zu einer Leitschaufelanströmkante 5, 7 erkennbar. Aus Gründen der Übersichtlichkeit wurde die Vertiefung 6 analog zum Schnitt C-C offen ausgebildet und die Abrundung weggelassen. Die Schrägstellung oder die asymmetrische Zuordnung von Vertiefung 6 und Leitschaufel 4 begünstigt den Abhebeeffekt für die Fasern im Bereich der Vertiefung 6. Somit können die Leitschaufeln in hydraulischer Hinsicht optimal gestaltet werden und brauchen nicht mehr, wie es auch bekannt ist, mit strömungsungünstigen Verdickungen im Bereich ihrer Anströmkanten 5 ausgestaltet werden.5, a spatial representation with the aid of grid surfaces, shows the course of a depression 6 and its position relative to a leading-edge leading edge 5, 7. For reasons of clarity, the recess 6 was made open analogous to the section CC and the rounding was omitted. The inclination or the asymmetrical assignment of recess 6 and guide vane 4 favors the lifting effect for the fibers in the region of the recess 6 Guide vanes are designed optimally in hydraulic terms and no longer need, as is also known, to be designed with flow-unfavorable thickenings in the region of their leading edges 5.

Claims (9)

Kreiselpumpe, mit einem innerhalb eines Gehäuses angeordneten Propeller sowie dem Propeller nachgeordneten Leitschaufeln, wobei die Leitschaufeln mit faserabweisenden Formgebungen versehen sind, dadurch gekennzeichnet, daß im Bereich der Leitschaufel-Anströmkanten (5) Vertiefungen (6) angeordnet sind, und daß die Vertiefungen (6) eine Verbindung zwischen den Räumen (14, 15) beiderseits einer Leitschaufel (4) herstellen.Centrifugal pump, with a propeller arranged within a housing and guide vanes arranged downstream of the propeller, the guide vanes being provided with fiber-repellent shapes, characterized in that depressions (6) are arranged in the region of the guide vane leading edges (5), and that the depressions (6 ) create a connection between the rooms (14, 15) on both sides of a guide vane (4). Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefungen (6) einen länglichen Verlauf aufweisen.Centrifugal pump according to claim 1, characterized in that the depressions (6) have an elongated course. Kreiselpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sich die Vertiefungen (6) im Winkel zur Rotationsebene eines Propellers (2) erstrecken.Centrifugal pump according to claim 1 or 2, characterized in that the depressions (6) extend at an angle to the plane of rotation of a propeller (2). Kreiselpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß im Bereich der Vertiefungen (6) die Schaufeln (4) mit einer Kante (7) freistehend ausgebildet sind.Centrifugal pump according to one of claims 1 to 3, characterized in that in the region of the depressions (6) the blades (4) are designed to be free-standing with an edge (7). Kreiselpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Vertiefungen (6) zu den Schaufeln asymmetrisch angeordnet sind.Centrifugal pump according to one of claims 1 to 4, characterized in that the depressions (6) are arranged asymmetrically to the blades. Kreiselpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Seitenwände (10, 11) der Vertiefungen (6) unterschiedlich geneigt sind.Centrifugal pump according to one of claims 1 to 5, characterized in that the side walls (10, 11) of the depressions (6) are inclined differently. Kreiselpumpe nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die geneigten Seitenwände (10, 11) überwiegend in demjenigen Vertiefungsteil angeordnet sind, der in Bezug auf die Leitkanäle (14, 15) eine größere Fläche aufweist.Centrifugal pump according to claim 5 or 6, characterized in that the inclined side walls (10, 11) are arranged predominantly in that recess part which has a larger area with respect to the guide channels (14, 15). Kreiselpumpe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Vertiefungen (6) im Gehäuse- (1) und/oder Nabenteil (3) angeordnet ist.Centrifugal pump according to one of Claims 1 to 7, characterized in that the depressions (6) are arranged in the housing (1) and / or hub part (3). Kreiselpumpe nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß zwischen Leitschaufel, Vertiefung (6) und/oder Gehäuse (1) abgerundete Übergänge (8, 9) angeordnet sind.Centrifugal pump according to one of Claims 1 to 8, characterized in that rounded transitions (8, 9) are arranged between the guide vane, recess (6) and / or housing (1).
EP96102053A 1995-03-24 1996-02-13 Fibres repelling wall-shape design Expired - Lifetime EP0733805B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19510811A DE19510811A1 (en) 1995-03-24 1995-03-24 Fiber-repellent wall surface design
DE19510811 1995-03-24

Publications (2)

Publication Number Publication Date
EP0733805A1 true EP0733805A1 (en) 1996-09-25
EP0733805B1 EP0733805B1 (en) 1998-09-23

Family

ID=7757631

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102053A Expired - Lifetime EP0733805B1 (en) 1995-03-24 1996-02-13 Fibres repelling wall-shape design

Country Status (5)

Country Link
US (1) US5785495A (en)
EP (1) EP0733805B1 (en)
CN (1) CN1070583C (en)
AT (1) ATE171517T1 (en)
DE (2) DE19510811A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2902813A1 (en) * 2006-06-23 2007-12-28 Jean-Claude Perdriel Grinder-pump assembly for e.g. lavatory installation, has motor equipped with wheel that ensures pumping and grinding of matter evacuated form lavatory bowl and is formed by pressing of metal blank, and blade curved to present helical shape

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5429409A (en) * 1993-01-04 1995-07-04 Asc Incorporated Convertible top
US6083849A (en) 1995-11-13 2000-07-04 Micron Technology, Inc. Methods of forming hemispherical grain polysilicon
US6435832B1 (en) 2000-04-27 2002-08-20 Chemineer, Inc. Hub assembly
JP3862137B2 (en) * 2000-09-20 2006-12-27 淳一 黒川 Turbo hydraulic machine
US6386830B1 (en) * 2001-03-13 2002-05-14 The United States Of America As Represented By The Secretary Of The Navy Quiet and efficient high-pressure fan assembly
FR2825142B1 (en) * 2001-05-22 2003-08-29 Conseils Etudes Et Recherches En Gestion De Lair Cerga FAN INTENDED TO BE ASSOCIATED WITH AN AIR EXHAUST DUCT OUTSIDE AT LEAST ONE PREMISES
DE10258922A1 (en) * 2002-12-17 2004-07-01 Ksb Aktiengesellschaft suction
US20090263238A1 (en) * 2008-04-17 2009-10-22 Minebea Co., Ltd. Ducted fan with inlet vanes and deswirl vanes
BRPI0918721A2 (en) 2008-09-10 2017-02-07 Pentair Pump Group Inc high efficiency multistage centrifugal pump and mounting method
US8124019B2 (en) * 2009-08-21 2012-02-28 Exxonmobil Chemical Patents Inc. Clog-resistant pump assembly for slurry loop reactor
NL2003467C2 (en) 2009-09-10 2011-03-14 Nijhuis Pompen B V FISH-FRIENDLY PUMP OR TURBINE DEVICE.
CA2729368C (en) 2010-12-31 2019-04-16 Ke Imports Ltd. Men's garment with pouch and supporting flap
CN104612977B (en) * 2014-12-15 2017-08-04 武汉船用机械有限责任公司 A kind of design method of the high-lift liquid pump hydraulic component of efficient big flow
GB2545412B (en) 2015-12-11 2018-06-06 Dyson Technology Ltd A hair care appliance comprising a motor
EP4110122A4 (en) 2020-02-25 2024-03-13 0912139 B C Ltd Male garment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE501662C (en) * 1930-07-05 Koester Friedrich Screw or propeller pump
US2202790A (en) * 1938-02-23 1940-05-28 Allis Chalmers Mfg Co Waste paper stock pump
EP0475920A1 (en) * 1990-09-12 1992-03-18 ITT Flygt Aktiebolag Clog resistant pump
EP0512190A1 (en) * 1990-04-02 1992-11-11 Itt Flygt Ab Clog resistant pump

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA562851A (en) * 1958-09-02 F. Hausmann George Boundary layer control apparatus for compressors
GB619722A (en) * 1946-12-20 1949-03-14 English Electric Co Ltd Improvements in and relating to boundary layer control in fluid conduits
GB877976A (en) * 1959-03-11 1961-09-20 Power Jets Res & Dev Ltd Multistage axial flow compressors
US3168048A (en) * 1962-11-14 1965-02-02 Dengyosha Mach Works Full range operable high specific speed pumps
SE384070B (en) * 1974-07-23 1976-04-12 Stenberg Flygt Ab PROPELLER PUMP
GB2245312B (en) * 1984-06-19 1992-03-25 Rolls Royce Plc Axial flow compressor surge margin improvement
JPH04132899A (en) * 1990-09-25 1992-05-07 Mitsubishi Heavy Ind Ltd Axial blower
DE4314477A1 (en) * 1993-05-03 1994-11-10 Klein Schanzlin & Becker Ag Centrifugal pump of axial design
US5397215A (en) * 1993-06-14 1995-03-14 United Technologies Corporation Flow directing assembly for the compression section of a rotary machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE501662C (en) * 1930-07-05 Koester Friedrich Screw or propeller pump
US2202790A (en) * 1938-02-23 1940-05-28 Allis Chalmers Mfg Co Waste paper stock pump
EP0512190A1 (en) * 1990-04-02 1992-11-11 Itt Flygt Ab Clog resistant pump
EP0475920A1 (en) * 1990-09-12 1992-03-18 ITT Flygt Aktiebolag Clog resistant pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2902813A1 (en) * 2006-06-23 2007-12-28 Jean-Claude Perdriel Grinder-pump assembly for e.g. lavatory installation, has motor equipped with wheel that ensures pumping and grinding of matter evacuated form lavatory bowl and is formed by pressing of metal blank, and blade curved to present helical shape

Also Published As

Publication number Publication date
EP0733805B1 (en) 1998-09-23
ATE171517T1 (en) 1998-10-15
CN1070583C (en) 2001-09-05
DE59600588D1 (en) 1998-10-29
CN1136644A (en) 1996-11-27
DE19510811A1 (en) 1996-09-26
US5785495A (en) 1998-07-28

Similar Documents

Publication Publication Date Title
EP0733805B1 (en) Fibres repelling wall-shape design
DE3332132T1 (en) Centrifugal pump for liquids containing solids
EP0623752B1 (en) Centrifugal pump impeller
DE10327574B4 (en) Impeller for a fuel pump
WO2005106207A1 (en) Compressor blade and compressor
EP2188532B1 (en) Pump rotor and pump comprising a pump rotor of said type
DE4006604A1 (en) DEVICE FOR FLUIDIZING, DEGASSING AND PUMPING A CELLULOSE FIBER MATERIAL SUSPENSION
DE2361328C2 (en) Centrifugal pump with gas discharge from the impeller
DE69922198T2 (en) CENTRIFUGAL PUMP
EP0750119B1 (en) Pump impeller
DE3843428C2 (en) Centrifugal pump impeller with low specific speed
DE10314425B4 (en) Guide device for a designed in sheet metal housing of a centrifugal pump
DE3519816C2 (en) Impeller for pumps
EP1344944B1 (en) Centrifugal pump with crushing device
DE4041545A1 (en) CENTRIFUGAL PUMP
DE60311165T2 (en) Centrifugal pump for low flow rates with improved suction height
EP3922855A1 (en) Rotor for a centrifugal pump
EP1120572A2 (en) Centrifugal pump
EP0623750B1 (en) Pump of the axial type
EP3559475B1 (en) Vortex pump
DE3022206C2 (en) Axial compressor with shifted surge limit
EP1423613B1 (en) Supply pump
DE3123275C2 (en) Centrifugal pump for dishwashers
EP3014127B1 (en) Pump device
DE60211797T2 (en) pump impeller

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

17P Request for examination filed

Effective date: 19961107

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 19980311

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980923

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19980923

REF Corresponds to:

Ref document number: 171517

Country of ref document: AT

Date of ref document: 19981015

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59600588

Country of ref document: DE

Date of ref document: 19981029

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19981110

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: GERMAN

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19981223

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19981223

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990213

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990213

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990504

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

BERE Be: lapsed

Owner name: KSB A.G.

Effective date: 19990228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990831

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000229

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000229

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050124

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050208

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050217

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20050218

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20050222

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060213

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060214

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060228

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060901

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060901

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060213

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20060901

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20061031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070213