EP3077679B1 - Plastic pump casing made of an inner shell and an outer shell, with filling material in between - Google Patents

Plastic pump casing made of an inner shell and an outer shell, with filling material in between Download PDF

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Publication number
EP3077679B1
EP3077679B1 EP14808615.0A EP14808615A EP3077679B1 EP 3077679 B1 EP3077679 B1 EP 3077679B1 EP 14808615 A EP14808615 A EP 14808615A EP 3077679 B1 EP3077679 B1 EP 3077679B1
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EP
European Patent Office
Prior art keywords
casing
pump
housing according
pump housing
segments
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.)
Active
Application number
EP14808615.0A
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German (de)
French (fr)
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EP3077679A1 (en
Inventor
Alexander BÖHM
Armin Gaiser
Sven Kilian
Karl-Heinz KÖFLER
Alexander PÜTTERICH
Schramm BERND
Andrea Seemann
Markus Steffens
Frank Anna
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KSB SE and Co KGaA
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KSB SE and Co KGaA
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Publication of EP3077679A1 publication Critical patent/EP3077679A1/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • 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
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/5893—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps heat insulation or conduction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/60—Assembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/14—Casings, housings, nacelles, gondels or the like, protecting or supporting assemblies there within
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/40—Organic materials
    • F05B2280/4003—Synthetic polymers, e.g. plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/40—Organic materials
    • F05B2280/4011—Organic materials not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
    • F05B2280/6003—Composites; e.g. fibre-reinforced
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
    • F05B2280/6012—Foam
    • 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
    • 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
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced

Definitions

  • the invention relates to a housing for a centrifugal pump and a method for producing a housing for a centrifugal pump.
  • Casings for centrifugal pumps are known in various embodiments.
  • the housing is made of special materials.
  • the static structure of the housing is also heavily dependent on the area of application.
  • the present invention relates to pump housings in the area of aggressive media, wherein a material is to be used which does not corrode due to these media.
  • So-called liner pumps represent a simple form of corrosion protection.
  • the interior of the pump that comes into contact with the media is lined with a plastic.
  • the disadvantage is that the housing may be exposed to corrosion from the outside.
  • the EP 0 206 031 A1 shows such a lining of a pump housing, which is equipped with reinforcing elements.
  • the outer housing remains conventional. Differences in pressure inside the housing can cause the liner to come off.
  • the EP 1 972 788 A1 shows, for example, a housing made of plastic, which consists of several parts, the housing being divided for easy replacement of wearing parts.
  • the EP 0 797 737 B1 shows a housing with a plastic inner housing, the outer housing can be dismantled in an advantageous manner, wherein an exchange of the inner housing should also be easily accessible.
  • the inner and outer housings are in a form-fitting manner. As with all coatings, there is a risk that corrosion will occur between the housing and the coating, causing the coating to peel off. If the coating is damaged, corrosion can also occur on the housing.
  • the DE 1096753 describes a wear-resistant centrifugal pump for conveying coarse material with a rubber wear insert, which consists of several anchored profile strips.
  • the DE 199 53 911 A1 discloses the preamble of claim 1.
  • the EP 2 236 839 A1 discloses another relevant pump.
  • the object of the present invention is to produce a pump housing in a plastic construction, the housing having a first casing with a first side facing the pumping medium, the housing having a second casing with a second side facing the environment.
  • the pump housing should be stable and inexpensive to manufacture.
  • This object is solved by the features of claim 1.
  • the distance between the first and the second shell is provided with a filling material.
  • This Filling material initially supports the two casings on one another.
  • a filler material can be selected so that possible vibrations between the two shells are reduced by damping in the filler material. Another possibility is the reduction of heat transfer between the two shells by means of an appropriate heat-insulating filler.
  • the lower part of the pump housing is composed of segments. This has the advantage that individual parts are easy to manufacture.
  • the individual segment can be designed in such a way that its shape completely avoids undercuts.
  • the filling material is a self-foaming foam, in particular a foam that expands without building up pressure.
  • the advantage of the self-foaming foam lies in the already mentioned expansion without pressure build-up. This prevents damage to the sleeves. Another advantage is that there is no need for complex mechanical processing of the foam core, which would be necessary if foamed foam was already used.
  • a self-foaming epoxy resin foam has very good mechanical properties compared to conventional foams such as polyurethane foam. It is also inexpensive.
  • the individual segments can be connected by connecting flanges, which enable the individual segments to be arranged precisely, which must be provided for optimum hydraulic function.
  • sealing devices that seal the entire housing can be incorporated into the connecting flanges. If necessary, stabilizing elements can be incorporated into the connecting flanges.
  • reinforcement elements are provided in the distance between the first and the second casing, which give the entire housing sufficient stability.
  • connecting elements can be provided between the two shells, which transmit both tensile and compressive forces.
  • the first and / or second shell is made of fiber-reinforced composite material, the fibers being made of glass, carbon, boron or aramid.
  • the associated matrix system consists of a thermoplastic, for example PP, PA, PE, PC, SAN, PBT, PPS or similar, or of a thermoset, such as EP, UP, VE, PF, PU or similar, which embeds the fibers. This makes it possible to find an ideally adapted solution for the design of the pump housing for the particular application of the pump. Pressure loads are taken into account, depending on the delivery head of the pump, vibrations that act on the housing, influences of the pumped medium, which is why special chemical or thermal stability may be necessary.
  • a pump housing can be constructed from a plurality of geometrically identical segments. This significantly simplifies the manufacture of the housing. Several identical segments can be prepared in parallel; for diversification, special segments that take into account the properties of a special pump can be incorporated into the entire housing. With the addition of special parts, a very large number of different pump housings can be produced from a stock of standardized segments, which can be adapted to almost any application.
  • the pump housings which are produced with the means according to the invention, can be constructed as a combination of plastic parts and metallic components. They can be provided with an in-situ coating both on the outside and on the inside, which faces the medium to be conveyed, which is leakproof for the respective medium.
  • a gelcoat coating makes the surface fluid-tight and particularly smooth, and it also prevents individual fibers from being exposed.
  • Surfaces can also be provided which are very stable and do not react mechanically or chemically with the pumped medium, for example an additional coating can be provided which is suitable for drinking water, further coatings can reduce abrasion.
  • the invention relates to a method for producing a pump housing according to claim 16.
  • This includes that in a first step the geometric shape of the housing is determined, a hydraulically and mechanically optimized shape is determined, which is based on the usual rules of construction Then, in a further step, this geometric shape is subdivided in such a way that there is no undercut in each segment of the lower part. This simplifies the manufacture of the segment in such a way that a complex design of a casting mold with a core or post-processing of the component can be avoided.
  • the upper part and the individual segments are made of a composite material, with connecting flanges being formed.
  • the upper part and the segments are joined to form a housing component, a first casing and a second casing being formed in each case, a distance being formed between the first and the second casing, which is provided with a filling material in a further step ,
  • the invention is explained in more detail using an exemplary embodiment.
  • the drawing shows a system for liquid treatment according to the invention.
  • the Fig. 1 shows an inventive housing of a centrifugal pump and the Fig. 2 a detail from it.
  • the housing is constructed from individual sleeves 1, 2, which are made from a fiber-reinforced plastic, for example from glass fiber fabric with epoxy resin or vinyl ester resin.
  • the individual parts of the sleeves are manufactured in the usual lamination processes, whereby hand lamination processes, injection presses (RTM), reaction injection molding or vacuum infusion processes are particularly suitable. All processes aim to create an approximately 10 mm thick shell, which is produced in a shape free of inclusions or bubbles.
  • the side facing the mold becomes very smooth, which is why it can be used without or with little post-processing both as a surface for the pump chamber and as a contact surface between the sleeves.
  • the opposite surface of the respective shell is rather rough and does not need to be processed further.
  • the covers 1, 2 are connected so that the two rough sides face each other.
  • the connection can be made detachable or fixed.
  • the cavity created between an outer shell 1 and an inner shell 2 is filled with a foam 3.
  • This foam preferably binds to the rough surface and expands without further pressure build-up. It is preferred to use polyurethane foam or epoxy resin foam.
  • the upper part of the housing is made in one piece, while the lower part of the housing is composed of several segments 6.
  • the segments 6 are tailored in such a way that they form the desired pump chamber 4, care being taken to ensure that the geometry of the individual segments does not have any undercuts, which considerably simplifies production.
  • a seal can additionally be provided between the individual segments 6, which can be arranged in specially shaped sealing grooves if required.
  • the connection of the segments can either be detachable by screws or non-detachable, for example by gluing.
  • the segments 6 of the lower part of the housing can be designed such that identical parts can be used.
  • any number of the latter segments can be arranged between the former.
  • the parts themselves can be manufactured identically during production.
  • the upper part of the housing would then be made for each pump according to the number of stages.
  • the upper and lower part of the housing are advantageously provided with a seal and releasably connected to one another.
  • inserts 8 are provided in the upper part of the housing, which serve to mechanically stiffen the housing part.
  • these inserts 8 are designed as 40 mm thick metal parts. The parts are positioned exactly, the respective position with regard to an advantageous distribution of occurring forces as well as to reduce vibrations is selected.
  • the positioned inserts 8 are laminated into position in the housing part before the segment is provided with the expanding foam.
  • flanges 7 are incorporated into the housing for connection to adjacent components. These are, for example, laminated into a shell 1 as metal parts and then provided with any necessary bores.
  • the housing shown can be attached to mounting structures, which can also be supported by laminated metal parts.
  • mounting structures which can also be supported by laminated metal parts.
  • feet can be provided on the underside, which are reinforced by a corresponding metal insert in the segments 6 of the lower part of the housing.
  • the Fig.2 shows the upper part of the housing, consisting of the outer shell 1 and the inner shell 2.
  • the space is filled with the foam 3.
  • This detail view shows various holes for attachment to the lower part, for example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft ein Gehäuse für eine Kreiselpumpe, sowie ein Verfahren zur Herstellung eines Gehäuses für eine Kreiselpumpe.The invention relates to a housing for a centrifugal pump and a method for producing a housing for a centrifugal pump.

Gehäuse für Kreiselpumpen sind in verschiedenen Ausführungsformen bekannt. Je nach Einsatzbedingungen, also Arbeitsdruck, Fördermedium, Medientemperatur oder ähnlichem, ist das Gehäuse aus speziellen Materialien gefertigt. Der statische Aufbau des Gehäuses ist ebenfalls stark vom Einsatzgebiet abhängig.Casings for centrifugal pumps are known in various embodiments. Depending on the operating conditions, i.e. working pressure, pumped medium, media temperature or the like, the housing is made of special materials. The static structure of the housing is also heavily dependent on the area of application.

Die vorliegende Erfindung betrifft Pumpengehäuse im Bereich aggressiver Medien, wobei ein Werkstoff zum Einsatz kommen soll, der durch diese Fördermedien nicht korrodiert.The present invention relates to pump housings in the area of aggressive media, wherein a material is to be used which does not corrode due to these media.

Eine einfache Art des Korrosionsschutzes stellen sogenannte Liner Pumpen dar. Hierbei wird der medienberührte Innenbereich der Pumpe mit einem Kunststoff ausgekleidet. Nachteilig ist, dass das Gehäuse von außen unter Umständen doch der Korrosion ausgesetzt ist. Die EP 0 206 031 A1 zeigt eine derartige Auskleidung eines Pumpengehäuses, die mit Verstärkungselementen ausgestattet ist. Das Außengehäuse bleibt dabei konventionell ausgeführt. Durch Druckunterschiede innerhalb des Gehäuses besteht die Gefahr, dass sich der Liner ablöst.So-called liner pumps represent a simple form of corrosion protection. The interior of the pump that comes into contact with the media is lined with a plastic. The disadvantage is that the housing may be exposed to corrosion from the outside. The EP 0 206 031 A1 shows such a lining of a pump housing, which is equipped with reinforcing elements. The outer housing remains conventional. Differences in pressure inside the housing can cause the liner to come off.

Gehäuse die vollständig aus Kunststoff gefertigt sind, schließen dies ebenfalls aus, jedoch ist bei komplexeren Gehäuseformen ein erheblicher Aufwand bei der Herstellung erforderlich. Die EP 1 972 788 A1 zeigt beispielsweise ein Gehäuse aus Kunststoff, das aus mehreren Teilen besteht, wobei das Gehäuse zum einfachen Austausch von Verschleißteilen unterteilt ist.Housings that are made entirely of plastic also exclude this, however, in the case of more complex housing shapes, considerable manufacturing effort is required. The EP 1 972 788 A1 shows, for example, a housing made of plastic, which consists of several parts, the housing being divided for easy replacement of wearing parts.

Die EP 0 797 737 B1 zeigt ein Gehäuse mit einem Kunststoffinnengehäuse, dessen Außengehäuse in vorteilhafter Weise zerlegbar ist, wobei ebenfalls ein Austausch des Innengehäuses einfach erreichbar sein soll. Auch hier liegen Innen- und Außengehäuse formschlüssig aneinander an. Wie bei allen Beschichtungen besteht die Gefahr, dass zwischen dem Gehäuse und der Beschichtung Korrosion auftritt, wodurch die Beschichtung sich ablösen kann. Wird die Beschichtung beschädigt, kann am Gehäuse ebenfalls Korrosion auftreten.The EP 0 797 737 B1 shows a housing with a plastic inner housing, the outer housing can be dismantled in an advantageous manner, wherein an exchange of the inner housing should also be easily accessible. Here, too, the inner and outer housings are in a form-fitting manner. As with all coatings, there is a risk that corrosion will occur between the housing and the coating, causing the coating to peel off. If the coating is damaged, corrosion can also occur on the housing.

Die DE 1096753 beschreibt eine verschleißfeste Kreiselpumpe zum Fördern von grobem Fördergut mit einem Verschleißeinsatz aus Gummi, der aus mehreren nebeneinanderliegenden, verankerten Profilstreifen besteht.The DE 1096753 describes a wear-resistant centrifugal pump for conveying coarse material with a rubber wear insert, which consists of several anchored profile strips.

Die DE 199 53 911 A1 offenbart den Oberbegriff von Anspruch 1. Die EP 2 236 839 A1 offenbart eine weitere, relevante Pumpe.The DE 199 53 911 A1 discloses the preamble of claim 1. The EP 2 236 839 A1 discloses another relevant pump.

Aufgabe der vorliegenden Erfindung ist es, ein Pumpengehäuse in Kunststoffbauweise herzustellen, wobei das Gehäuse über eine erste Hülle mit einer dem Fördermedium zugewandten erste Seite verfügt, wobei das Gehäuse über eine zweite Hülle mit einer der Umgebung zugewandten zweiten Seite verfügt. Das Pumpengehäuse soll stabil und kostengünstig herstellbar sein.The object of the present invention is to produce a pump housing in a plastic construction, the housing having a first casing with a first side facing the pumping medium, the housing having a second casing with a second side facing the environment. The pump housing should be stable and inexpensive to manufacture.

Diese Aufgabe wird durch die Merkmale von Anspruch 1 gelöst. Dieses beinhaltet, dass bei dem Pumpengehäuse die erste und die zweite Hülle jeweils formstabil ausgestaltet sind und zwischen der ersten Hülle und der zweiten Hülle ein Abstand besteht. Dies bietet den Vorteil, dass die beiden Hüllen unabhängig voneinander herstellbar sind, wobei insbesondere bei der Herstellung von Kunststoffteilen die jeweilige Kontur in einem einfachen Laminierverfahren herstellbar ist, da innere und äußere Gehäuseform unabhängig voneinander sind. Der Abstand zwischen der ersten und der zweiten Hülle wird mit einem Füllmaterial versehen. Dieses Füllmaterial bewirkt zunächst eine Abstützung der beiden Hüllen aufeinander. Zusätzlich kann ein Füllmaterial so gewählt werden, dass mögliche Vibrationen zwischen den beiden Hüllen durch Dämpfung im Füllmaterial reduziert werden. Eine weitere Möglichkeit bietet sich mit der Reduktion von Wärmeübertragung zwischen den beiden Hüllen durch ein entsprechendes wärmeisolierendes Füllmaterial.This object is solved by the features of claim 1. This means that in the pump housing the first and the second casing are each designed to be dimensionally stable and there is a distance between the first casing and the second casing. This offers the advantage that the two shells can be produced independently of one another, the particular contour being able to be produced in a simple lamination process, in particular in the production of plastic parts, since the inner and outer housing shapes are independent of one another. The distance between the first and the second shell is provided with a filling material. This Filling material initially supports the two casings on one another. In addition, a filler material can be selected so that possible vibrations between the two shells are reduced by damping in the filler material. Another possibility is the reduction of heat transfer between the two shells by means of an appropriate heat-insulating filler.

Erfindungsgemäß ist der untere Teil des Pumpengehäuses aus Segmenten zusammengesetzt. Dies bietet den Vorteil, dass Einzelteile einfach herstellbar sind. Das einzelne Segment kann so ausgestaltet sein, dass seine Form Hinterschneidungen gänzlich vermeidet.According to the invention, the lower part of the pump housing is composed of segments. This has the advantage that individual parts are easy to manufacture. The individual segment can be designed in such a way that its shape completely avoids undercuts.

In einer weiteren Ausgestaltung der Erfindung ist das Füllmaterial ein selbstschäumender Schaumstoff, insbesondere ein Schaumstoff, der ohne Druckaufbau expandiert. Der Vorteil des selbstschäumenden Schaumstoffes liegt in der bereits erwähnten Expansion ohne Druckaufbau. Dadurch wird eine Schädigung der Hüllen vermieden. Ein weiterer Vorteil ist, dass eine aufwendige mechanische Bearbeitung des Schaumstoffkerns entfällt, die notwendig wäre, wenn bereits geschäumter Schaumstoff zum Einsatz käme. Desweiteren weist ein selbstschäumender Epoxyharzschaumstoff sehr gute mechanische Eigenschaften auf im Vergleich zu konventionellen Schaumstoffen, wie beispielsweise Polyurethan-Schaum. Zudem ist er kostengünstig.In a further embodiment of the invention, the filling material is a self-foaming foam, in particular a foam that expands without building up pressure. The advantage of the self-foaming foam lies in the already mentioned expansion without pressure build-up. This prevents damage to the sleeves. Another advantage is that there is no need for complex mechanical processing of the foam core, which would be necessary if foamed foam was already used. Furthermore, a self-foaming epoxy resin foam has very good mechanical properties compared to conventional foams such as polyurethane foam. It is also inexpensive.

In einer weiteren Ausgestaltung sind die einzelnen Segmente durch Anschlussflansche verbindbar, diese ermöglichen eine passgenaue Anordnung der einzelnen Segmente, die zur optimalen hydraulischen Funktion gegeben sein muss. Zusätzlich können in die Anschlussflansche Dichtvorrichtungen eingearbeitet sein, die das gesamte Gehäuse abdichten. Bedarfsweise lassen sich in die Anschlussflansche stabilisierende Elemente einarbeiten.In a further embodiment, the individual segments can be connected by connecting flanges, which enable the individual segments to be arranged precisely, which must be provided for optimum hydraulic function. In addition, sealing devices that seal the entire housing can be incorporated into the connecting flanges. If necessary, stabilizing elements can be incorporated into the connecting flanges.

In einer weiteren Ausgestaltung sind in dem Abstand zwischen der ersten und der zweiten Hülle Armierungselemente vorgesehen, die dem gesamten Gehäuse eine ausreichende Stabilität verleihen. Insbesondere sind Verbindungselemente zwischen den beiden Hüllen vorsehbar, die sowohl Zug- als auch Druckkräfte übertragen.In a further embodiment, reinforcement elements are provided in the distance between the first and the second casing, which give the entire housing sufficient stability. In particular, connecting elements can be provided between the two shells, which transmit both tensile and compressive forces.

In einer weiteren Ausgestaltung ist die erste und/oder zweite Hülle aus faserverstärktem Verbundmaterial hergestellt, wobei die Fasern aus Glas, Kohlenstoff, Bor oder Aramid bestehen. Das zugehörige Matrixsystem besteht aus einem Thermoplast, beispielsweise PP, PA, PE, PC, SAN, PBT, PPS oder ähnliche oder aus einem Duroplast, wie beispielsweise EP, UP, VE, PF, PU oder vergleichbare, der die Fasern einbettet. Hierdurch lässt sich für die jeweilige Anwendung der Pumpe eine ideal angepasste Lösung für die Ausgestaltung des Pumpengehäuses finden. Berücksichtigt werden Druckbelastung, in Abhängigkeit von der Förderhöhe der Pumpe, Vibrationen, die auf das Gehäuse einwirken, Einflüsse des geförderten Mediums, weshalb eine besondere chemische oder thermische Stabilität notwendig sein kann.In a further embodiment, the first and / or second shell is made of fiber-reinforced composite material, the fibers being made of glass, carbon, boron or aramid. The associated matrix system consists of a thermoplastic, for example PP, PA, PE, PC, SAN, PBT, PPS or similar, or of a thermoset, such as EP, UP, VE, PF, PU or similar, which embeds the fibers. This makes it possible to find an ideally adapted solution for the design of the pump housing for the particular application of the pump. Pressure loads are taken into account, depending on the delivery head of the pump, vibrations that act on the housing, influences of the pumped medium, which is why special chemical or thermal stability may be necessary.

In einer besonders vorteilhaften Ausgestaltung ist ein Pumpengehäuse aus mehreren geometrisch gleichen Segmenten aufbaubar. Dies erleichtert die Herstellung des Gehäuses deutlich. Mehrere gleiche Segmente lassen sich parallel vorbereiten, zur Diversifizierung können spezielle Segmente, die Eigenschaften einer speziellen Pumpe berücksichtigen, in das gesamte Gehäuse eingearbeitet werden. So lassen sich aus einem Vorrat an standardisierten Segmenten mit der Erweiterung um die speziellen Teile eine sehr große Anzahl verschiedener Pumpengehäuse herstellen, die zu nahezu jedem beliebigen Anwendungsbereich anpassbar sind.In a particularly advantageous embodiment, a pump housing can be constructed from a plurality of geometrically identical segments. This significantly simplifies the manufacture of the housing. Several identical segments can be prepared in parallel; for diversification, special segments that take into account the properties of a special pump can be incorporated into the entire housing. With the addition of special parts, a very large number of different pump housings can be produced from a stock of standardized segments, which can be adapted to almost any application.

Die Pumpengehäuse, die mit den erfindungsgemäßen Mitteln hergestellt sind, können als eine Kombination aus Kunststoffteilen und metallischen Bauteilen aufgebaut sein. Sie können sowohl an ihrer Außenseite, als auch an der Innenseite, die dem Fördermedium zugewandt ist, mit einer in-situ Beschichtung versehen sein, die dicht für das jeweilige Medium ist. Beispielsweise wird mittels einer Gelcoat Beschichtung die Oberfläche fluiddicht und besonders glatt, außerdem wird verhindert, dass einzelne Fasern freiliegen. Ebenso können Oberflächen vorgesehen sein, die sehr stabil sind und weder mechanisch noch chemisch mit dem Fördermedium reagieren, beispielsweise kann eine zusätzliche Beschichtung vorgesehen sein, die trinkwassergeeignet ist, weitere Beschichtungen können abrassionsmindernd sein.The pump housings, which are produced with the means according to the invention, can be constructed as a combination of plastic parts and metallic components. They can be provided with an in-situ coating both on the outside and on the inside, which faces the medium to be conveyed, which is leakproof for the respective medium. For example, a gelcoat coating makes the surface fluid-tight and particularly smooth, and it also prevents individual fibers from being exposed. Surfaces can also be provided which are very stable and do not react mechanically or chemically with the pumped medium, for example an additional coating can be provided which is suitable for drinking water, further coatings can reduce abrasion.

Des weiteren betrifft die Erfindung ein Verfahren zum Herstellen eines Pumpengehäuses nach Anspruch 16. Dieses beinhaltet, dass in einem ersten Schritt die geometrische Form des Gehäuses festgelegt wird, wobei eine hydraulisch und mechanisch optimierte Form ermittelt wird, die sich an den üblichen Regeln der Konstruktion orientiert, anschließend wird in einem weiteren Schritt diese geometrische Form derart unterteilt, dass in jedem Segment des unteren Teils keine Hinterschneidung auftritt. Dies vereinfacht die Herstellung des Segments derart, dass eine aufwändige Gestaltung einer Gussform mit einem Kern oder eine Nachbearbeitung des Bauteils vermeidbar wird. In einem nächsten Schritt werden der obere Teil und die einzelnen Segmente aus einem Verbundmaterial hergestellt, wobei Anschlussflansche ausgebildet werden. In einem nächsten Schritt werden der obere Teil und die Segmente zu einem Gehäusebauteil gefügt, wobei jeweils eine erste Hülle und eine zweite Hülle ausgebildet werden, wobei zwischen der ersten und der zweiten Hülle ein Abstand entsteht, der in einem weiteren Schritt mit einem Füllmaterial versehen wird.Furthermore, the invention relates to a method for producing a pump housing according to claim 16. This includes that in a first step the geometric shape of the housing is determined, a hydraulically and mechanically optimized shape is determined, which is based on the usual rules of construction Then, in a further step, this geometric shape is subdivided in such a way that there is no undercut in each segment of the lower part. This simplifies the manufacture of the segment in such a way that a complex design of a casting mold with a core or post-processing of the component can be avoided. In a next step, the upper part and the individual segments are made of a composite material, with connecting flanges being formed. In a next step, the upper part and the segments are joined to form a housing component, a first casing and a second casing being formed in each case, a distance being formed between the first and the second casing, which is provided with a filling material in a further step ,

Anhand eines Ausführungsbeispiels wird die Erfindung näher erläutert. Die Zeichnung zeigt eine erfindungsgemäße Anlage zur Flüssigkeitsbehandlung.The invention is explained in more detail using an exemplary embodiment. The drawing shows a system for liquid treatment according to the invention.

Die Fig. 1 zeigt ein erfindungsgemäßes Gehäuse einer Kreiselpumpe und die Fig. 2 einen Detailausschnitt daraus.The Fig. 1 shows an inventive housing of a centrifugal pump and the Fig. 2 a detail from it.

Ein erfindungsgemäßes Gehäuse einer Kreiselpumpe ist in der Fig. 1 dargestellt. Das Gehäuse ist aus einzelnen Hüllen 1, 2 aufgebaut, die aus einem faserverstärkten Kunststoff, beispielsweise aus Glasfasergewebe mit Epoxidharz beziehungsweise Vinylesterharz, hergestellt sind. Die einzelnen Teile der Hüllen werden in üblichen Laminierverfahren hergestellt, wobei sich hierfür besonders Handlaminierverfahren, Spritzpressen (RTM), Reaction Injection Moulding oder Vakuuminfusionsverfahren eignen. Alle Verfahren zielen darauf ab möglichst eine etwa 10 mm dicke Hülle zu erstellen, die in einer Form frei von Einschlüssen oder Blasen hergestellt wird. Die der Form zugewandte Seite die Oberfläche wird sehr glatt, weshalb sie ohne oder mit nur geringer Nachbearbeitung sowohl als Oberfläche für den Pumpenraum als auch als Kontaktfläche zwischen den Hüllen genutzt werden kann. Die gegenüberliegende Oberfläche der jeweiligen Hülle ist eher rau und braucht nicht weiter bearbeitet zu werden. Die Hüllen 1, 2 werden so verbunden, dass die beiden rauen Seiten zueinander zeigen. Die Verbindung kann dabei lösbar oder fest ausgeführt sein. Der zwischen einer äußeren Hülle 1 und einer inneren Hülle 2 entstehende Hohlraum, wird mit einem Schaumstoff 3 gefüllt. Dieser Schaumstoff verbindet sich bevorzugt mit der rauen Oberfläche und expandiert ohne weiteren Druckaufbau. Bevorzugt wird man hier Polyurethan Schaumstoff oder Epoxidharzschaum verwenden.An inventive housing of a centrifugal pump is in the Fig. 1 shown. The housing is constructed from individual sleeves 1, 2, which are made from a fiber-reinforced plastic, for example from glass fiber fabric with epoxy resin or vinyl ester resin. The individual parts of the sleeves are manufactured in the usual lamination processes, whereby hand lamination processes, injection presses (RTM), reaction injection molding or vacuum infusion processes are particularly suitable. All processes aim to create an approximately 10 mm thick shell, which is produced in a shape free of inclusions or bubbles. The side facing the mold becomes very smooth, which is why it can be used without or with little post-processing both as a surface for the pump chamber and as a contact surface between the sleeves. The opposite surface of the respective shell is rather rough and does not need to be processed further. The covers 1, 2 are connected so that the two rough sides face each other. The connection can be made detachable or fixed. The cavity created between an outer shell 1 and an inner shell 2 is filled with a foam 3. This foam preferably binds to the rough surface and expands without further pressure build-up. It is preferred to use polyurethane foam or epoxy resin foam.

Der obere Teil des Gehäuses ist einteilig ausgeführt, während der untere Teil des Gehäuses aus mehreren Segmenten 6 zusammengesetzt ist. Die Segmente 6 sind so zugeschnitten, dass sie den gewünschten Pumpenraum 4 ausbilden, wobei darauf geachtet wurde, dass die Geometrie der einzelnen Segmente ohne Hinterschneidungen auskommt, wodurch die Herstellung wesentlich erleichtert wird. Zwischen den einzelnen Segmenten 6 kann zusätzlich eine Abdichtung vorgesehen sein, die bei Bedarf in speziell ausgeformten Dichtungsnuten angeordnet sein kann. Die Verbindung der Segmente kann entweder lösbar durch Schrauben als auch nicht lösbar, beispielsweise durch Kleben erfolgen.The upper part of the housing is made in one piece, while the lower part of the housing is composed of several segments 6. The segments 6 are tailored in such a way that they form the desired pump chamber 4, care being taken to ensure that the geometry of the individual segments does not have any undercuts, which considerably simplifies production. A seal can additionally be provided between the individual segments 6, which can be arranged in specially shaped sealing grooves if required. The connection of the segments can either be detachable by screws or non-detachable, for example by gluing.

Erfindungsgemäß können die Segmente 6 des unteren Teils des Gehäuses so ausgeführt sein, dass Gleichteile verwendet werden können. Beispielsweise gibt es Segmente, die für den Rand geeignet sind und Segmente, die den Pumpenraum für einzelne Pumpenstufen bereit stellen. Abhängig von der Anzahl der Pumpenstufen lassen sich beliebig viele der letzeren Segmente zwischen die erstgenannten anordnen. Die Teile selbst können bei der Fertigung identisch hergestellt werden. Der obere Teil des Gehäuses wäre dann für jede Pumpe entsprechend der Stufenanzahl passend herzustellen. Oberer und Unterer Teil des Gehäuses werden vorteilhafter Weise mit einer Dichtung versehen und lösbar miteinander verbunden.According to the invention, the segments 6 of the lower part of the housing can be designed such that identical parts can be used. For example, there are segments that are suitable for the edge and segments that provide the pump space for individual pump stages. Depending on the number of pump stages, any number of the latter segments can be arranged between the former. The parts themselves can be manufactured identically during production. The upper part of the housing would then be made for each pump according to the number of stages. The upper and lower part of the housing are advantageously provided with a seal and releasably connected to one another.

Im oberen Teil des Gehäuses sind verschiedene Einleger 8 vorgesehen, die der mechanischen Aussteifung des Gehäuseteils dienen. Diese Einleger 8 sind im vorliegenden Ausführungsbeispiel als 40 mm starke Metallteile ausgeführt. Die Teile werden exakt positioniert, wobei die jeweilige Position in Hinblick auf eine vorteilhafte Verteilung von auftretenden Kräften als auch zur Reduktion von Schwingungen gewählt wird. Die positionierten Einleger 8 werden an ihrer Position in den Gehäuseteil einlaminiert, bevor das Segment mit dem expandierenden Schaum versehen wird. Auf ähnliche Weise werden in das Gehäuse Flansche 7 zur Verbindung mit benachbarten Bauteilen eingearbeitet. Diese werden beispielsweise als Metallteile in eine Hülle 1 einlaminiert und anschließend mit eventuell notwendigen Bohrungen versehen.Various inserts 8 are provided in the upper part of the housing, which serve to mechanically stiffen the housing part. In the present exemplary embodiment, these inserts 8 are designed as 40 mm thick metal parts. The parts are positioned exactly, the respective position with regard to an advantageous distribution of occurring forces as well as to reduce vibrations is selected. The positioned inserts 8 are laminated into position in the housing part before the segment is provided with the expanding foam. In a similar manner, flanges 7 are incorporated into the housing for connection to adjacent components. These are, for example, laminated into a shell 1 as metal parts and then provided with any necessary bores.

Durch die Herstellung der einzelnen Segmente 6 in einer Laminierform ergibt sich eine gute Passgenauigkeit, die die Montage von Spaltringen 5 im Pumpenraum 4 deutlich vereinfacht. Vor dem abschließenden Zusammenbau des Gehäuses lassen sich die Spaltringe 5 an ihrer jeweiligen Position befestigen. Im fertigen Gehäuse sind diese dann passgenau und dicht fixiert.The production of the individual segments 6 in a laminating mold results in a good fit, which significantly simplifies the assembly of split rings 5 in the pump chamber 4. Before the final assembly of the housing, the split rings 5 can be attached in their respective positions. In the finished housing, these are then precisely and tightly fixed.

An dem in der Fig. 1 dargestellten Gehäuse lassen sich Befestigungsstrukturen anbringen, wobei diese ebenfalls durch einlaminierte Metallteile gestützt werden können. Beispielsweise lassen sich an der Unterseite Standfüße vorsehen, die durch einen entsprechenden Metalleinleger in den Segmenten 6 des Unterteils des Gehäuses verstärkt werden.On the one in the Fig. 1 The housing shown can be attached to mounting structures, which can also be supported by laminated metal parts. For example, feet can be provided on the underside, which are reinforced by a corresponding metal insert in the segments 6 of the lower part of the housing.

Die Fig.2 zeigt das Oberteil des Gehäuses, bestehend aus der äußeren Hülle 1 und der inneren Hülle 2. Der Zwischenraum ist mit dem Schaumstoff 3 gefüllt. An dieser Detailansicht sind verschiedene Bohrungen zur Befestigung beispielsweise am Unterteil dargestellt. Bezugszeichenliste 1 äußere Hülle 5 Spaltring 2 innere Hülle 6 Segment 3 Schaumstoff 7 Flansch 4 Pumpenraum 8 Einleger The Fig.2 shows the upper part of the housing, consisting of the outer shell 1 and the inner shell 2. The space is filled with the foam 3. This detail view shows various holes for attachment to the lower part, for example. LIST OF REFERENCE NUMBERS 1 outer shell 5 split ring 2 inner shell 6 segment 3 foam 7 flange 4 pump room 8th depositors

Claims (17)

  1. Housing of a multistage centrifugal pump, made of plastic, the housing having a first casing (1) with a first side facing a pumped medium, the housing having a second casing (2) with a second side facing the environment, the first and second casings (1, 2) each being designed to be dimensionally stable and there being a spacing between the first casing and the second casing, the spacing between the first casing (1) and the second casing (2) being provided with a filling material (3), wherein, if the pump axis is aligned horizontally, the housing consists of an upper part and a lower part, which form the pump chamber (4),
    characterized in that
    the upper part of the housing is of a one-part design, while the lower part of the housing is made up of a number of segments (6), wherein the segments (6) provide the pump chamber for individual pump stages.
  2. Pump housing according to Claim 1, characterized in that in the lower part the first casing (1) and/or the second casing (2) is/are made up of segments (6) .
  3. Pump housing according to one of the preceding claims, characterized in that the filling material (3) is a self-expanding foam, in particular a foam that expands without any buildup of pressure.
  4. Pump housing according to one of the preceding claims, characterized in that the filling material (3) is a composite material.
  5. Pump housing according to one of the preceding claims, characterized in that the individual segments (6) each have no undercuts.
  6. Pump housing according to one of the preceding claims, characterized in that the individual segments (6) can be connected by connection flanges (7) .
  7. Pump housing according to Claim 6, characterized in that sealing devices are incorporated in the connection flanges (7).
  8. Pump housing according to one of the preceding claims, characterized in that reinforcing elements are provided in the spacing between the first casing (1) and the second casing (2).
  9. Pump housing according to one of the preceding claims, characterized in that the first casing (1) and/or the second casing (2) is/are produced from fiber-reinforced composite material comprising a matrix system and fibers.
  10. Pump housing according to Claim 9, characterized in that the fibers consist of glass, carbon, boron or aramid.
  11. Pump housing according to either of Claims 9 and 10, characterized in that the matrix system consists of a plastic, in particular consists of a thermoplastic or thermoset.
  12. Pump housing according to one of the preceding claims, characterized in that the lower part can be constructed from a number of geometrically identical segments (6).
  13. Pump housing according to either of Claims 6 and 7, characterized in that stabilizing elements are provided in the connection flanges (7).
  14. Pump housing according to one of the preceding claims, characterized in that the pump housing is produced as a combination of plastic parts and metal components.
  15. Pump housing according to one of the preceding claims, characterized in that a coating which is fluid-impermeable, in particular a coating on an epoxy-resin basis, is provided.
  16. Method for producing a pump housing according to one of the preceding claims, characterized in that in a first step the geometrical form of the housing is established, wherein a hydraulically and mechanically optimized form that is based on the usual rules of structural design is determined, in a further step this geometrical form is divided up in such a way that, if the pump axis is aligned horizontally, the housing consists of an upper part and a lower part, which form the pump chamber, wherein the upper part is of a one-part design and wherein the lower part is divided up into segments (6) in such a way that the segments provide the pump chamber for individual pump stages and in such a way that in each segment there is no undercut, in a next step the upper part and the individual segments (6) are produced from a composite material, wherein connection flanges (7) are formed, in a next step the upper part and the segments are joined to form a housing component, wherein a first casing (1) with a first side facing the pumped medium and a second casing (2) with a second side facing the environment are formed, creating a spacing between the first casing (1) and the second casing (2) that is provided with a filling material (3) in a further step.
  17. Method for producing a pump housing according to Claim 16, characterized in that the surface is worked by providing a coating, in particular by providing a coating that produces a roughness of less than 10 µm on the surface.
EP14808615.0A 2013-12-06 2014-12-05 Plastic pump casing made of an inner shell and an outer shell, with filling material in between Active EP3077679B1 (en)

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DE102013225065.7A DE102013225065B4 (en) 2013-12-06 2013-12-06 Pump housing in plastic construction
PCT/EP2014/076706 WO2015082679A1 (en) 2013-12-06 2014-12-05 Plastic pump housing consisting of an inner casing, an outer casing and filling material therebetween

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EP (1) EP3077679B1 (en)
JP (1) JP6345246B6 (en)
CN (1) CN105814318B (en)
CY (1) CY1122921T1 (en)
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DE102018200287A1 (en) 2018-01-10 2019-07-11 Siemens Aktiengesellschaft Turbomachinery inner housing

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CN105814318B (en) 2018-12-14
US20160312794A1 (en) 2016-10-27
JP2016540158A (en) 2016-12-22
EP3077679A1 (en) 2016-10-12
JP6345246B2 (en) 2018-06-20
US10415589B2 (en) 2019-09-17
JP6345246B6 (en) 2018-07-18
DE102013225065B4 (en) 2016-04-14
WO2015082679A1 (en) 2015-06-11
CN105814318A (en) 2016-07-27
IL245929A0 (en) 2016-07-31
IL245929B (en) 2020-07-30
DK3077679T3 (en) 2020-05-18
DE102013225065A1 (en) 2015-06-11
CY1122921T1 (en) 2021-10-29

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