EP0797737A1 - Centrifugal pump case with an inside case made of plastic - Google Patents

Centrifugal pump case with an inside case made of plastic

Info

Publication number
EP0797737A1
EP0797737A1 EP95941672A EP95941672A EP0797737A1 EP 0797737 A1 EP0797737 A1 EP 0797737A1 EP 95941672 A EP95941672 A EP 95941672A EP 95941672 A EP95941672 A EP 95941672A EP 0797737 A1 EP0797737 A1 EP 0797737A1
Authority
EP
European Patent Office
Prior art keywords
housing
centrifugal pump
inner housing
extension
pump according
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
EP95941672A
Other languages
German (de)
French (fr)
Other versions
EP0797737B1 (en
Inventor
Armin Renneisen
Axel Riel
Frank Schwaab
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 EP0797737A1 publication Critical patent/EP0797737A1/en
Application granted granted Critical
Publication of EP0797737B1 publication Critical patent/EP0797737B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4286—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the invention relates to a centrifugal pump according to the preamble of claim 1.
  • Centrifugal pump housings are usually made of a metallic material. However, there are applications in which a pumped medium can damage the metallic material due to its aggressiveness. Pump housings made of plastic are suitable for conveying media of this type, since, in addition to their high resistance to aggressive media, they also enable inexpensive production. Pump cases made entirely of plastic have prevailed for applications that are subject to low pressure loads. In those applications, however, in which the pump housing is exposed to greater external or internal pressure loads, the plastic housing is reinforced by an outer metallic housing. This counteracts the property of the plastic to flow under the influence of pressure loads.
  • a pump housing is known, the outer housing of which is designed to be divided in the axial direction of a drive shaft, the part plane running through the pressure port and the suction port.
  • This design allows the molding production of an inner housing made of plastic, which is provided with already molded suction and pressure ports.
  • the inner housing In the area of a housing cover, the inner housing has a radially projecting collar.
  • Corresponding bundles are also located at the end of the suction and pressure ports. These collars are used to fix the inner housing and at the same time form a seal for flanges of pressure lines or housing covers to be fastened to them. Because plastics are subject to shrinkage and within the pump housing If changing pressures prevail, additional measures are required to ensure that the inner housing is securely seated.
  • the invention is based on the problem of minimizing the deformation behavior of a plastic inner housing under the influence of pressure or temperature. This problem is solved according to the features of claim 1.
  • the inner housing With the attachment of a radial extension in the area of the housing division, the inner housing is fixed relative to the outer housing.
  • the effect of temperature changes on the inner housing, which cause a change in length of the inner housing, can be significantly reduced.
  • the previous solutions, which provide for the fixing of an inner housing by means of collars acting as sealing surfaces on the housing faces, have a considerable axial distance between these collars. Under the influence of temperature and the resulting changes in length, the inner housing may be deformed.
  • the solution according to the invention provides for the inner housing to be fixed in the region of a housing division running transversely to the shaft axis.
  • the inner housing part surrounding an impeller has an outer projecting extension, which is defined in the region of the housing division between the two parts of the outer housing.
  • Embodiments of the invention which are described in claims 2 and 3, define the area in which the extension is arranged on the inner housing. This is usually the central area of the housing section that a
  • Impeller wrapped Depending on the size of the pump to be used, the position of the extension in the middle area can vary somewhat in order to match the partial level of a pressure port.
  • the further refinements of the invention describe the shape and mounting of the extension. It can be designed as a circumferential annular element or as projecting sections arranged in sections.
  • the shape of the above extension depends on the manner in which the counter surfaces can be produced in the area of the partial plane of the outer housing. This depends on the technical equipment available from a manufacturer.
  • Fig. 1 shows a section through a lined centrifugal pump
  • Fig. 2 is a view of a partial housing surface with an inserted inner housing
  • Fig. 3 is a partial view of an inner housing with a separate insert
  • Partial plane 1 is perpendicular to the drawing plane. It extends transversely to the shaft axis 2, through the pressure port 3 and forms a joining zone for housing parts 4, 5 which, when assembled, form an outer housing.
  • the housing part 4 here has a suction port 6 and the housing part 5 serves to receive the outer housing closing pressure cover 7.
  • the housing parts 4, 5 and the pressure cover 7 are held together with a plurality of connecting elements 8, here screw elements, distributed over the circumference of the outer housing.
  • An abutment 10 for a shaft seal 11 is attached in the area of a bushing for the shaft 9.
  • the housing part 5 of the outer housing has a groove 12, in which an extension 13 of an inner housing 14 engages.
  • this groove 13 can be provided on only one or on both housing parts 4, 5.
  • the inner housing 14 shown here is formed in one piece, this being dependent on the material used in each case. In the case of a soft, resilient material, the molded sealing surface 15 can be pushed into the suction nozzle 6 during assembly. A different design solution is used for materials that do not allow such deformation.
  • a liner 16 attached to the pressure cover 7 serves to close the inner housing 14, a sealing ring 17 effectively preventing the escape of liquid.
  • Fig. 2 which corresponds to a section along line A - A of Fig. 1, shows a view of the housing part 4 with inserted inner housing 14. In the left half of the picture, a circumferential extension 13 is shown, while in the right half of the picture several segment-like or Extentions 13 arranged in a sector are shown.
  • the extension 13 can also be designed as an insert. This could be a one-part or multi-part component, which can, for example, also be molded into the inner housing 14.
  • Mounts 16 formed on the housing part 4 have receptacles 17 for the housing parts 4, 5 holding means holding together. In the simplest form, these are threaded holes for fastening screws or bolts.
  • FIG. 3 shows an embodiment of an extension 13 which at the same time acts as a reinforcing element for the inner housing 14.
  • the extension 13 is part of a separate insert.
  • the part of the extension 13 which engages in the plastic of the inner housing 14 can be of different shapes. What is important is a shape that hinders the movement of the inner housing 14.
  • a ring element 18 with a T-shaped cross section is shown here by way of example. Its part enclosed by the material of the inner housing can additionally reinforce the wall surface against deformation. To improve the connection, it is also possible to provide a plurality of openings 19.
  • a projecting web then serves as an extension 13 for fixing the inner housing 14 between the parts 4, 5 of the outer housing.

Abstract

The invention pertains to a split centrifugal pump case which has a lined inside case. The inside case has a protruding extension piece with which it is fixed in a dividing plane of the outer centrifugal pump case.

Description

Beschreibung description
Kreiselpumpengehäuse mit Innengehäuse aus KunststoffCentrifugal pump housing with plastic inner housing
Die Erfindung betrifft eine Kreiselpumpe nach dem Oberbegriff von Anspruch 1.The invention relates to a centrifugal pump according to the preamble of claim 1.
Kreiselpumpengehäuse bestehen gewöhnlich aus einem metallischen Werkstoff. Es gibt jedoch Anwendungsfälle, bei denen ein Fördermedium aufgrund seiner Aggressivität den metallischen Werkstoff schädigen kann. Für derartige Fördermedien sind aus Kunststoff bestehende Pumpengehäuse geeignet, da sie neben ihrer hohen Widerstandsfähigkeit gegen aggressive Medien auch eine günstige Fertigung ermöglichen. Für durch Druckkräfte gering belastete Anwendungsfälle haben sich vollständig aus Kunststoff bestehende Pumpengehäuse durchgesetzt. In denjenigen Anwendungsfällen jedoch, bei denen das Pumpengehäuse größeren äußeren oder inneren Druckbelastungen ausgesetzt ist, wird das Kunststoffgehäuse durch ein äußeres metallisches Gehäuse verstärkt. Damit wird der Eigenschaft des Kunststoffes, unter dem Einfluß von Druckbelastungen zu fließen, entgegengewirkt.Centrifugal pump housings are usually made of a metallic material. However, there are applications in which a pumped medium can damage the metallic material due to its aggressiveness. Pump housings made of plastic are suitable for conveying media of this type, since, in addition to their high resistance to aggressive media, they also enable inexpensive production. Pump cases made entirely of plastic have prevailed for applications that are subject to low pressure loads. In those applications, however, in which the pump housing is exposed to greater external or internal pressure loads, the plastic housing is reinforced by an outer metallic housing. This counteracts the property of the plastic to flow under the influence of pressure loads.
Es ist ein Pumpengehäuse bekannt, dessen Außengehäuse in Achsrichtung einer Antriebswelle geteilt ausgebildet ist, wobei die Teilebene durch den Druckstutzen und den Saugstutzen verläuft. Diese Bauform erlaubt die formende Herstellung eines aus Kunststoff bestehenden Innengehäuses, welches mit bereits angeformten Saug- und Druckstutzen versehen ist. Im Bereich eines Gehäuse-Verschlußdeckels verfügt das Innengehäuse über einen radial abstehenden Bund. Entsprechende Bunde befinden sich auch am Ende der Saug- und Druckstutzen. Diese Bunde dienen der Fixierung des Innengehäuses und bilden gleichzeitig eine Dichtung für daran zu befestigende Flansche von Druckleitungen oder Gehäusedeckeln. Da Kunststoffe einer Schwindung unterliegen, und innerhalb des Pumpengehäuses wechselnde Drücke vorherrschen können, sind zusätzliche Maßnahmen zur sicheren Anlage des Innengehäuses erforderlich.A pump housing is known, the outer housing of which is designed to be divided in the axial direction of a drive shaft, the part plane running through the pressure port and the suction port. This design allows the molding production of an inner housing made of plastic, which is provided with already molded suction and pressure ports. In the area of a housing cover, the inner housing has a radially projecting collar. Corresponding bundles are also located at the end of the suction and pressure ports. These collars are used to fix the inner housing and at the same time form a seal for flanges of pressure lines or housing covers to be fastened to them. Because plastics are subject to shrinkage and within the pump housing If changing pressures prevail, additional measures are required to ensure that the inner housing is securely seated.
Der Erfindung liegt das Problem zugrunde, das Verformungsverhalten eines Kunststoff-Innengehäuses unter Druck- oder Temperatureinflüssen zu minimieren. Die Lösung dieses Problems erfolgt gemäß den Merkmalen des Anspruches 1.The invention is based on the problem of minimizing the deformation behavior of a plastic inner housing under the influence of pressure or temperature. This problem is solved according to the features of claim 1.
Mit der Anbringung einer radialen Erstreckung im Bereich der Gehäuseteilung wird das Innengehäuse gegenüber dem Außengehäuse festgelegt. Auf das Innengehäuse einwirkende Temperaturwechsel, die eine Längenänderung des Innengehäuse verursachen, können in ihrer Wirkung erheblich reduziert werden. Die bisherigen Lösungen, die eine Festlegung eines Innengehäuses mittels als Dichtflächen wirkender Bunde an den Gehäusestirnseiten vorsieht, weisen zwischen diesen Bunden einen erheblichen axialen Abstand auf. Unter Temperatureinflüssen und den dadurch bedingten Längenänderungen kann es daher zu Verformungen des Innengehäuses kommen.With the attachment of a radial extension in the area of the housing division, the inner housing is fixed relative to the outer housing. The effect of temperature changes on the inner housing, which cause a change in length of the inner housing, can be significantly reduced. The previous solutions, which provide for the fixing of an inner housing by means of collars acting as sealing surfaces on the housing faces, have a considerable axial distance between these collars. Under the influence of temperature and the resulting changes in length, the inner housing may be deformed.
Die erfindungsgemäße Lösung sieht zur Reduzierung der Verformungen eine Festlegung des Innengehäuses im Bereich einer quer zur Wellenachse verlaufenden Gehäuseteilung vor. Der ein Laufrad umgebende Innengehäuseteil verfügt über eine äußere abstehende Erstreckung, die im Bereich der Gehäuseteilung zwischen den beiden Teilen des Außengehäuses festgelegt ist.To reduce the deformations, the solution according to the invention provides for the inner housing to be fixed in the region of a housing division running transversely to the shaft axis. The inner housing part surrounding an impeller has an outer projecting extension, which is defined in the region of the housing division between the two parts of the outer housing.
Damit wird für das Innengehäuse ein Festpunkt geschaffen, von dem aus durch Temperatureinflüsse bedingte Längenänderungen sich auswirken können. Da diese vorstehende bzw. abstehende Erstreckung im Bereich zwischen den Gehäusestirnseiten angeordnet ist, wirken auf das Innengehäuse geringere Formänderungsarbeiten ein. Die Teilung des Außengehäuses verläuft in vorteilhafter Weise, z. B. bei einer einstufigen Kreiselpumpe mit axialem Saug- und radialem Druckstutzen, auch durch den Druckstutzen. Das Innengehäuse kann dann mit angespritzter oder angeformter Druckstutzenauskleidung versehen sein. Für die Saugstutzenauskleidung bietet sich eine andere konstruktive Lösung an.This creates a fixed point for the inner housing, from which changes in length caused by temperature influences can have an effect. Since this protruding or protruding extension is arranged in the area between the housing end faces, less deformation work acts on the inner housing. The division of the outer housing runs in an advantageous manner, for. B. in a single-stage centrifugal pump with axial suction and radial pressure nozzle, too through the pressure port. The inner housing can then be provided with molded or molded pressure port lining. Another constructive solution is available for the suction nozzle lining.
Ausgestaltungen der Erfindung, die in den Ansprüchen 2 und 3 beschrieben sind, definieren den Bereich, in dem die Erstreckung am Innengehäuse angeordnet ist. Dies ist gewöhnlich der mittlere Bereich desjenigen Gehäuseabschnittes, der ein Embodiments of the invention, which are described in claims 2 and 3, define the area in which the extension is arranged on the inner housing. This is usually the central area of the housing section that a
Laufrad umhüllt. Je nach Baugröße der einzusetzenden Pumpe, kann die Lage der Erstreckung im mittleren Bereich etwas variieren, um mit der Teilebene eines Druckstutzens übereinzustimmen.Impeller wrapped. Depending on the size of the pump to be used, the position of the extension in the middle area can vary somewhat in order to match the partial level of a pressure port.
Die weiteren Ausgestaltungen der Erfindung beschreiben die Form und Halterung der Erstreckung. Sie kann als umlaufendes ringförmiges Element oder als sektionsweise angeordnete vorstehende Abschnitte gestaltet sein. Die Form der vorstehenden Erstreckung ist abhängig von der Art und Weise, mit der die Gegenflächen im Bereich der Teilebene des Außengehäuses herstellbar sind. Dies ist abhängig von der bei einem Hersteller vorhandenen technischen Ausrüstung.The further refinements of the invention describe the shape and mounting of the extension. It can be designed as a circumferential annular element or as projecting sections arranged in sections. The shape of the above extension depends on the manner in which the counter surfaces can be produced in the area of the partial plane of the outer housing. This depends on the technical equipment available from a manufacturer.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden beschrieben. Es zeigen dieEmbodiments of the invention are shown in the drawings and are described below. They show
Fig. 1 einen Schnitt durch eine ausgekleidete Kreiselpumpe, dieFig. 1 shows a section through a lined centrifugal pump, the
Fig. 2 eine Ansicht auf eine Gehäuseteilfläche mit eingelegtem Innengehäuse und dieFig. 2 is a view of a partial housing surface with an inserted inner housing and
Fig. 3 eine Teilansicht auf ein Innengehäuse mit separatem EinlegeteilFig. 3 is a partial view of an inner housing with a separate insert
In der Fig. 1 ist die Erfindung am Beispiel einer einstufigen Kreiselpumpe dargestellt, aber nicht darauf beschränkt. Die Teilebene 1 steht hier senkrecht auf der Zeichenebene. Sie verläuft quer zur Wellenachse 2, durch den Druckstutzen 3 und bildet eine Fügezone für Gehäuseteile 4, 5, die montiert ein Außengehäuse bilden.In Fig. 1, the invention is illustrated using the example of a single-stage centrifugal pump, but is not limited to this. Partial plane 1 is perpendicular to the drawing plane. It extends transversely to the shaft axis 2, through the pressure port 3 and forms a joining zone for housing parts 4, 5 which, when assembled, form an outer housing.
Der Gehäuseteil 4 verfügt hier über einen Saugstutzen 6 und der Gehäuseteil 5 dient zur Aufnahme eines das Außengehäuse verschließenden Druckdeckels 7. Mit mehreren über den Umfang des Außengehäuses verteilt angeordneten Verbindungselementen 8, hier Schraubelemente, werden die Gehäuseteile 4, 5 und der Druckdeckel 7 zusammengehalten. Im Bereich einer Durchführung für die Welle 9 ist ein Widerlager 10 für eine Wellenabdichtung 11 angebracht.The housing part 4 here has a suction port 6 and the housing part 5 serves to receive the outer housing closing pressure cover 7. The housing parts 4, 5 and the pressure cover 7 are held together with a plurality of connecting elements 8, here screw elements, distributed over the circumference of the outer housing. An abutment 10 for a shaft seal 11 is attached in the area of a bushing for the shaft 9.
In der Darstellung der Fig. 1 verfügt der Gehäuseteil 5 des Außengehäuses über eine Nut 12, in die eine Erstreckung 13 eines Innengehäuses 14 eingreift. Je nach Herstellungsart kann diese Nut 13 an nur einem oder an beiden Gehäuseteilen 4, 5 angebracht sein. Das hier dargestellte Innengehäuse 14 ist einteilig ausgebildet, wobei dies abhängig ist von dem jeweils Verwendung findenden Material. Bei einem weichen nachgiebigen Material kann die angeformte Dichtungsfläche 15 bei einer Montage in den Saugstutzen 6 geschoben werden. Bei Materialien, die eine derartige Verformung nicht zulassen, findet eine andere konstruktive Lösung Anwendung.1, the housing part 5 of the outer housing has a groove 12, in which an extension 13 of an inner housing 14 engages. Depending on the type of manufacture, this groove 13 can be provided on only one or on both housing parts 4, 5. The inner housing 14 shown here is formed in one piece, this being dependent on the material used in each case. In the case of a soft, resilient material, the molded sealing surface 15 can be pushed into the suction nozzle 6 during assembly. A different design solution is used for materials that do not allow such deformation.
Eine am Druckdeckel 7 angebrachte Auskleidung 16 dient dem Verschluß des Innengehäuses 14, wobei ein Dichtungsring 17 einen Flüssigkeitsaustritt wirkungsvoll verhindert.A liner 16 attached to the pressure cover 7 serves to close the inner housing 14, a sealing ring 17 effectively preventing the escape of liquid.
Durch die Festlegung des Innengehäuses 14 mit der radialen Erstreckung 13 zwischen den das Außengehäuse bildenden Gehäuseteilen 4, 5 wird die Formänderung des Innengehäuses unter Temperatureinflüssen wesentlich verringert. Die abstehende Erstreckung wirkt für das Innengehäuse 14 wie ein Festlager. Anstelle der bisher für die Formänderungsrechnung verwendeten Breite B ist nur noch der Abstand von der Erstreckung 13 zu den Endpunkten der Breite B zu verwenden. Dadurch wird das Innengehäuse 14 erheblich widerstandsfähiger gegenüber Formänderungen durch Temperatureinflüssen. Die Fig. 2, die einem Schnitt gemäß Linie A - A von Fig. 1 entspricht, zeigt eine Ansicht auf das Gehäuseteil 4 mit eingelegtem Innengehäuse 14. In der linken Bildhälfte ist eine umlaufende Erstreckung 13 dargestellt, während in der rechten Bildhälfte mehrere segmentartige bzw. sektorför ig angeordnete Erstreckungen 13 gezeigt sind. Die Erstreckung 13 kann auch als Einlegeteil ausgebildet sein. Dies könnte ein ein- oder mehrteiliges Bauteil sein, welches beispielsweise in das Innengehäuse 14 mit eingeformt sein kann. Am Gehäuseteil 4 angeformte Halterungen 16 verfügen über Aufnahmen 17 für die Gehäuseteile 4, 5 zusammenhaltende Befestigungsmittel. In der einfachsten Form sind dies Gewindebohrungen zur Befestigung von Schrauben oder Bolzen.By defining the inner housing 14 with the radial extension 13 between the housing parts 4, 5 forming the outer housing, the change in shape of the inner housing under the influence of temperature is significantly reduced. The protruding extension acts like a fixed bearing for the inner housing 14. Instead of the width B previously used for the deformation calculation, only the distance from the extension 13 to the end points of the width B is to be used. This makes the inner housing 14 considerably more resistant to changes in shape due to temperature influences. Fig. 2, which corresponds to a section along line A - A of Fig. 1, shows a view of the housing part 4 with inserted inner housing 14. In the left half of the picture, a circumferential extension 13 is shown, while in the right half of the picture several segment-like or Extentions 13 arranged in a sector are shown. The extension 13 can also be designed as an insert. This could be a one-part or multi-part component, which can, for example, also be molded into the inner housing 14. Mounts 16 formed on the housing part 4 have receptacles 17 for the housing parts 4, 5 holding means holding together. In the simplest form, these are threaded holes for fastening screws or bolts.
In der Fig. 3 ist eine Ausführungsform einer Erstreckung 13 gezeigt, die für das Innengehäuse 14 gleichzeitig als Verstärkungselement wirkt. Die Erstreckung 13 ist hierbei Bestandteil eines separaten Einlegeteiles. Der in den Kunststoff des Innengehäuses 14 eingreifende Teil der Erstreckung 13 kann von unterschiedlicher Form sein. Wichtig ist eine das Innengehäuse 14 in seiner Bewegung behindernde Form. Beispielhaft ist hier ein im Querschnitt T-förmiges Ringelement 18 gezeigt. Dessen vom Material des Innengehäuses umschlossener Teil kann zusätzlich eine Verstärkung der Wandfläche gegenüber Verformungen bewirken. Zur Verbesserung der Verbindung ist es auch möglich, eine Vielzahl von Öffnungen 19 anzubringen. Ein abstehender Steg dient dann als Erstreckung 13 zur Fixierung des Innengehäuses 14 zwischen den Teilen 4, 5 des Außengehäuses. 3 shows an embodiment of an extension 13 which at the same time acts as a reinforcing element for the inner housing 14. The extension 13 is part of a separate insert. The part of the extension 13 which engages in the plastic of the inner housing 14 can be of different shapes. What is important is a shape that hinders the movement of the inner housing 14. A ring element 18 with a T-shaped cross section is shown here by way of example. Its part enclosed by the material of the inner housing can additionally reinforce the wall surface against deformation. To improve the connection, it is also possible to provide a plurality of openings 19. A projecting web then serves as an extension 13 for fixing the inner housing 14 between the parts 4, 5 of the outer housing.

Claims

Patentansprüche claims
1. Kreiselpumpe mit einem kräfteübertragenden, mindestens zweiteiligen Außengehäuse und einem aus Kunststoff bestehenden Innengehäuse, wobei das Innengehäuse mit einem radial vorstehenden Teil am Außengehäuse anliegt, dadurch gekennzeichnet, daß das Außengehäuse (4, 5) eine quer zu einer Wellenachse (2) verlaufende Gehäuseteilung (1) aufweist, daß das Innengehäuse (14) im Bereich der Gehäuseteilung (1) eine vorstehende Erstreckung (13) aufweist und daß die Erstreckung in der Gehäuseteilung (1) festgelegt ist.1. Centrifugal pump with a force-transmitting, at least two-part outer housing and an inner housing consisting of plastic, the inner housing bearing with a radially projecting part on the outer housing, characterized in that the outer housing (4, 5) has a housing division transverse to a shaft axis (2) (1) has that the inner housing (14) in the region of the housing division (1) has a projecting extension (13) and that the extension is fixed in the housing division (1).
2. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die vorstehende Erstreckung (13) im mittleren Bereich der äußeren Umfangsflache des Innengehäuses angeordnet ist.2. Centrifugal pump according to claim 1, characterized in that the above extension (13) is arranged in the central region of the outer peripheral surface of the inner housing.
3. Kreiselpumpe nach Anspruch 2, dadurch gekennzeichnet, daß sich der mittlere Bereich über maximal 50 % der im Bereich des Außendurchmessers feststellbaren Breite (B) des Innengehäuses erstreckt.3. Centrifugal pump according to claim 2, characterized in that the central region extends over a maximum of 50% of the width (B) of the inner housing which can be determined in the region of the outer diameter.
4. Kreiselpumpe nach den Ansprüchen 1, 2 oder 3, dadurch gekennzeichnet, daß die vorstehende Erstreckung (13) ein- oder mehrteilig ist.4. Centrifugal pump according to claims 1, 2 or 3, characterized in that the above extension (13) is in one or more parts.
5. Kreiselpumpe nach Anspruch 4, dadurch gekennzeichnet, daß die vorstehende Erstreckung (13) in der Gehäuseteilung (1) eingeklemmt ist.5. Centrifugal pump according to claim 4, characterized in that the above extension (13) in the housing division (1) is clamped.
6. Kreiselpumpe nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die vorstehende Erstreckung (13) das Innengehäuse (14) im Außengehäuse (4, 5) positioniert. Kreiselpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Erstreckung (13) als ein- oder mehrteiliges Einlegeteil (16) ausgebildet ist. 6. Centrifugal pump according to claim 4 or 5, characterized in that the projecting extension (13) positions the inner housing (14) in the outer housing (4, 5). Centrifugal pump according to one of claims 1 to 6, characterized in that the extension (13) is designed as a single-part or multi-part insert (16).
EP95941672A 1994-12-16 1995-12-05 Centrifugal pump case with an inside case made of plastic Expired - Lifetime EP0797737B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4444968A DE4444968A1 (en) 1994-12-16 1994-12-16 Centrifugal pump housing with plastic inner housing
DE4444968 1994-12-16
PCT/EP1995/004782 WO1996018822A1 (en) 1994-12-16 1995-12-05 Centrifugal pump case with an inside case made of plastic

Publications (2)

Publication Number Publication Date
EP0797737A1 true EP0797737A1 (en) 1997-10-01
EP0797737B1 EP0797737B1 (en) 1999-03-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95941672A Expired - Lifetime EP0797737B1 (en) 1994-12-16 1995-12-05 Centrifugal pump case with an inside case made of plastic

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EP (1) EP0797737B1 (en)
DE (2) DE4444968A1 (en)
DK (1) DK0797737T3 (en)
WO (1) WO1996018822A1 (en)

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WO2021109625A1 (en) * 2019-12-06 2021-06-10 广州市拓道新材料科技有限公司 Ceramic pump body

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Publication number Priority date Publication date Assignee Title
US10415589B2 (en) 2013-12-06 2019-09-17 Ksb Aktiengesellschaft Plastic pump housing consisting of an inner casing, an outer casing and filling material therebetween
WO2021109625A1 (en) * 2019-12-06 2021-06-10 广州市拓道新材料科技有限公司 Ceramic pump body

Also Published As

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DE4444968A1 (en) 1996-06-20
WO1996018822A1 (en) 1996-06-20
EP0797737B1 (en) 1999-03-10
DE59505330D1 (en) 1999-04-15
DK0797737T3 (en) 2000-06-05

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