EP3204651B1 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
EP3204651B1
EP3204651B1 EP15774925.0A EP15774925A EP3204651B1 EP 3204651 B1 EP3204651 B1 EP 3204651B1 EP 15774925 A EP15774925 A EP 15774925A EP 3204651 B1 EP3204651 B1 EP 3204651B1
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EP
European Patent Office
Prior art keywords
centrifugal pump
housing
shaft
pump according
parting
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EP15774925.0A
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German (de)
French (fr)
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EP3204651A1 (en
Inventor
Björn-Christian WILL
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KSB SE and Co KGaA
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KSB SE and Co KGaA
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    • 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
    • F04D29/08—Sealings
    • F04D29/086—Sealings 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

Definitions

  • the invention relates to a centrifugal pump with at least one impeller, which is rotatably connected to a shaft and a housing which has parting lines.
  • Centrifugal pumps are based on the principle of energy transfer to a fluid due to a change in swirl due to a torque. The energy is transferred to the flowing fluid by a uniformly rotating impeller.
  • the centrifugal pump is a machine according to the direction of the energy flow, a fluid machine according to the type of energy conversion and a hydraulic fluid machine according to the type of fluid. Centrifugal pumps are able to continuously pump even large quantities to high and very high pressures.
  • the housing of the centrifugal pump is used for the liquid-tight and pressure-tight closure of the pump interior to the outside. It surrounds the pump rotor, which supplies energy to the medium through impellers on the rotating shaft.
  • the pressure range determines the shape of the housing.
  • Low-pressure pumps therefore require different design solutions than high-pressure and ultra-high-pressure pumps.
  • the wall thickness of the housing must be increased as the pressure level increases.
  • the dimensioning of the pump housing must comply with both national and international regulations.
  • the outer geometric shapes are adapted in favor of cylindrical, conical or spherical pump housings.
  • these configurations enable the pump housing to be subjected to low stress and suitable manufacturing methods for thick-walled (forged) components.
  • the DE 35 17 828 C2 shows a centrifugal pump with a housing which has an axial suction nozzle, a radial pressure nozzle and a pressure-side mounting flange.
  • a connection flange is attached to the suction nozzle, which is provided with force-dissipating elements.
  • the WO 2014/083374 A1 discloses a generic centrifugal pump.
  • the EP 2 375 109 A1 proposes to improve the sealing properties to produce a micro-toothing on at least one connection surface by a machining process.
  • the object of the invention is to provide a centrifugal pump, the housing segments of which are sealed in a simple and reliable manner, so that the centrifugal pump shows no leakage even at high delivery pressures.
  • the centrifugal pump should be characterized by an inexpensive production method, a reliable mode of operation and a long service life.
  • the joints have micro-gears between the individual housing parts of the centrifugal pump.
  • the surfaces between the individual segments have a smooth surface
  • the surfaces of adjacent segments are provided with a surface structure which has a micro-toothing. These are not macro shapes, but structures on the micrometer scale.
  • the micro toothing between the housing parts of the centrifugal pump leads to a high degree of transverse stability. This makes it possible, for example, to dispense with additional transverse fixing elements.
  • the micro-toothing leads to an unmistakable assignment of the individual housing segments of the centrifugal pump to one another.
  • the microstructure enables an exact fit.
  • the centrifugal pump according to the invention is characterized by a high level of tightness even at high delivery pressures.
  • the joints between the individual housing parts are no longer visible after installation.
  • the micro-toothing enables an exact fit, which enables an optimal transfer of force between the individual housing parts.
  • the centrifugal pump according to the invention is characterized by a very high accuracy of fit and a high load capacity. In addition, the crevice corrosion that often occurs in centrifugal pumps is prevented.
  • the parting lines are designed as fracture surfaces, it proving to be advantageous if these are brittle fracture surfaces.
  • a material is used for the pump housing, which has a high brittleness. This has been shown to favor separation.
  • the pump housing is first manufactured in one piece, for example as a cast component. Then predetermined breaking points are introduced. For example, these can be notch spots that are made by laser. A mandrel is preferably driven into the pump housing for the separation. The fracture plane is aligned by a targeted arrangement of the notches.
  • the predetermined breaking points are selected such that the micro-toothed parting lines run transversely to the shaft of the centrifugal pump. In this way, a pump housing with cross division is created.
  • the predetermined breaking points can be arranged so that the parting lines are arranged in one plane to the shaft of the centrifugal pump. According to the invention, this creates a pump housing with a longitudinal division.
  • the micro-toothed parting lines run through a suction port and / or a pressure port of the centrifugal pump. This is preferably a longitudinal division.
  • the joints can also run through housing areas through which the shaft is led out. In these areas, a seal is arranged between the shaft and the housing.
  • At least one parting line divides the housing into a segment which surrounds the impeller and a segment which surrounds the radial and / or axial bearings and thus forms the bearing housing.
  • Fig. 1 shows a centrifugal pump with an impeller 1, which is attached to a shaft 2.
  • the centrifugal pump comprises a housing 3, which surrounds a space 4 filled with liquid.
  • the housing 3 is a spiral housing.
  • the impeller 1 is rotatably arranged in the housing 3.
  • the housing 3 has a suction nozzle 5 and a pressure nozzle 6.
  • the shaft 2 is driven by a motor which in Figure 1 is not shown.
  • the shaft 2 is guided by bearing arrangements 7.
  • the bearing arrangements 7 include radial bearings and / or axial bearings.
  • the housing 3 is divided across the shaft 2 in the embodiment.
  • a segment 8 of the housing 3 surrounds the impeller 1 together with the liquid-filled space 4.
  • Another segment 9 of the housing 3 surrounds a part of the shaft 2.
  • Another segment 13 surrounds the bearing arrangements 7, which includes radial and / or axial bearings.
  • the housing 3 is divided into segments 8, 9 and 13 by the transverse division.
  • Figure 2 shows an enlarged view of section A according to Fig. 1 .
  • a separating joint 10 runs between the segments 8 and 9 of the housing 3 the parting line 10 has irregular micro-toothing.
  • the parting line 10 is formed by two adjacent surfaces. The surfaces have elevations 11 and depressions 12.
  • the elevations 11 and depressions 12 are interlocking, mutually corresponding shapes on the micrometer scale.
  • the parting line 10 is formed by two fracture surfaces. These are brittle fracture surfaces. In the exemplary embodiment, the surfaces are generated by fracture separation.
  • a predetermined breaking point is introduced as a notch in the housing 3 and then a force is exerted on this predetermined breaking point by means of a mandrel, so that the housing 3 breaks.
  • the housing 3 is divided into a segment 8, a segment 9 and a segment 13.
  • the segment 8 surrounds the impeller 1 and the medium.
  • the segment 9 surrounds part of the shaft 2.
  • the segment 13 surrounds the bearing arrangement 7, which comprises radial and axial bearings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft eine Kreiselpumpe mit mindestens einem Laufrad, das drehfest mit einer Welle verbunden ist und einem Gehäuse, das Trennfugen aufweist.The invention relates to a centrifugal pump with at least one impeller, which is rotatably connected to a shaft and a housing which has parting lines.

Kreiselpumpen beruhen auf dem Wirkprinzip der Energieübertragung an ein Fluid durch Dralländerung infolge eines Drehmoments. Die Energie wird von einem gleichförmig rotierenden Laufrad auf das strömende Fluid übertragen.Centrifugal pumps are based on the principle of energy transfer to a fluid due to a change in swirl due to a torque. The energy is transferred to the flowing fluid by a uniformly rotating impeller.

Die Kreiselpumpe ist nach der Richtung des Energieflusses eine Arbeitsmaschine, nach der Art der Energieumsetzung eine Strömungsmaschine und nach der Art des Fluids eine hydraulische Strömungsmaschine. Kreiselpumpen sind in der Lage, auch große Fördermengen kontinuierlich auf hohe und höchste Drücke zu fördern.The centrifugal pump is a machine according to the direction of the energy flow, a fluid machine according to the type of energy conversion and a hydraulic fluid machine according to the type of fluid. Centrifugal pumps are able to continuously pump even large quantities to high and very high pressures.

Das Gehäuse der Kreiselpumpe dient dem flüssigkeitsdichten und druckfesten Abschluss des Pumpeninnenraumes nach außen. Es umschließt den Pumpenläufer, der dem Fördermedium durch Laufräder auf der rotierenden Welle Energie zuführt.The housing of the centrifugal pump is used for the liquid-tight and pressure-tight closure of the pump interior to the outside. It surrounds the pump rotor, which supplies energy to the medium through impellers on the rotating shaft.

Bei Kreiselpumpen bestimmt der Druckbereich die Gehäuseform. So erfordern Niederdruckpumpen andere konstruktive Lösungen als Hoch- und Höchstdruckpumpen. Mit einem zunehmenden Druckniveau müssen die Wandstärken des Gehäuses erhöht werden. Dabei muss die Dimensionierung des Pumpengehäuses sowohl nationalen als auch internationalen Regelwerken entsprechen.For centrifugal pumps, the pressure range determines the shape of the housing. Low-pressure pumps therefore require different design solutions than high-pressure and ultra-high-pressure pumps. The wall thickness of the housing must be increased as the pressure level increases. The dimensioning of the pump housing must comply with both national and international regulations.

Bei Spiralgehäuse- und mehrstufigen Hochdruckpumpen werden die äußeren geometrischen Formen zugunsten zylindrischer, kegeliger oder kugeliger Pumpengehäuse angepasst. Diese Konfigurationen ermöglichen trotz des hohen Innendrucks eine niedrige Spannungsbelastung des Pumpengehäuses und geeignete Herstellmethoden für dickwandige (geschmiedete) Bauteile.In the case of volute casing and multi-stage high pressure pumps, the outer geometric shapes are adapted in favor of cylindrical, conical or spherical pump housings. Despite the high internal pressure, these configurations enable the pump housing to be subjected to low stress and suitable manufacturing methods for thick-walled (forged) components.

In der DE 196 53 936 A1 wird eine Kreiselpumpe mit einem mehrteiligen Außengehäuse und einem davon umgebenen Innengehäuse beschrieben. Ein Laufrad befindet sich innerhalb des Gehäuses. Mittels einer Welle wird das Laufrad über einen Antriebsmotor in Rotation versetzt. Zwischen Welle und Gehäuse ist eine Wellenabdichtung angeordnet.In the DE 196 53 936 A1 describes a centrifugal pump with a multi-part outer housing and an inner housing surrounded by it. An impeller is located inside the housing. The impeller is rotated by a drive motor by means of a shaft. A shaft seal is arranged between the shaft and the housing.

Die DE 35 17 828 C2 zeigt eine Kreiselpumpe mit einem Gehäuse, das einen axialen Saugstutzen, einen radialen Druckstutzen sowie einen druckseitigen Befestigungsflansch aufweist. Am Saugstutzen ist ein Anschlussflansch angebracht, der mit kräfteableitenden Elementen versehen ist.The DE 35 17 828 C2 shows a centrifugal pump with a housing which has an axial suction nozzle, a radial pressure nozzle and a pressure-side mounting flange. A connection flange is attached to the suction nozzle, which is provided with force-dissipating elements.

Aus Montagegründen ist häufig eine Gehäuseteilung erforderlich. Dabei treten Trennfugen zwischen den Gehäusesegmenten auf, die eine Abdichtung erforderlich machen. Es handelt sich dabei um statische Dichtflächen, die zu einander ruhen. Diese werden unter Einbringen eines Dichtstoffes gegeneinander verspannt. Dazu sind meist hohe Kräfte erforderlich.For installation reasons, a division of the housing is often necessary. Separation joints occur between the housing segments, which make sealing necessary. These are static sealing surfaces that rest against each other. These are braced against each other by introducing a sealant. This usually requires high forces.

Die WO 2014/083374 A1 offenbart eine gattungsgemäße Kreiselpumpe.The WO 2014/083374 A1 discloses a generic centrifugal pump.

Die EP 2 375 109 A1 schlägt zur Verbesserung der Abdichtungseigenschaften vor, eine Mikroverzahnung auf wenigstens einer Verbindungsfläche durch ein spanabhebendes Verfahren zu erzeugen.The EP 2 375 109 A1 proposes to improve the sealing properties to produce a micro-toothing on at least one connection surface by a machining process.

Aufgabe der Erfindung ist es, eine Kreiselpumpe anzugeben, deren Gehäusesegmente auf einfache und zuverlässige Weise abgedichtet werden, so dass die Kreiselpumpe auch bei hohen Förderdrücken keine Leckage aufweist. Die Kreiselpumpe soll sich durch eine kostengünstige Herstellungsweise, eine zuverlässige Betriebsweise, sowie durch eine lange Lebensdauer auszeichnen.The object of the invention is to provide a centrifugal pump, the housing segments of which are sealed in a simple and reliable manner, so that the centrifugal pump shows no leakage even at high delivery pressures. The centrifugal pump should be characterized by an inexpensive production method, a reliable mode of operation and a long service life.

Diese Aufgabe wird erfindungsgemäß durch eine Kreiselpumpe mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention by a centrifugal pump with the features of claim 1.

Die Trennfugen weisen zwischen den einzelnen Gehäuseteilen der Kreiselpumpe Mikroverzahnungen auf. Im Gegensatz zu herkömmlichen Kreiselpumpen, bei denen die Flächen zwischen den einzelnen Segmenten eine glatte Oberfläche aufweisen, werden bei der erfindungsgemäßen Kreiselpumpe die Oberflächen angrenzender Segmente mit einer Oberflächenstruktur versehen, die eine Mikroverzahnung aufweisen. Dabei handelt es sich nicht um Makroformen sondern um Strukturen im Mikrometermaßstab. Die Mikroverzahnung zwischen den Gehäuseteilen der Kreiselpumpe führt zu einer hohen Querstabilität. Dadurch kann beispielsweise auf zusätzliche Querfixierungselemente verzichtet werden. Zudem führt die Mikroverzahnung zu einer unverwechselbaren Zuordnung der einzelnen Gehäusesegmente der Kreiselpumpe zueinander. Das Mikrogefüge ermöglicht eine exakte Passung.The joints have micro-gears between the individual housing parts of the centrifugal pump. In contrast to conventional centrifugal pumps, in which the surfaces between the individual segments have a smooth surface, in the centrifugal pump according to the invention the surfaces of adjacent segments are provided with a surface structure which has a micro-toothing. These are not macro shapes, but structures on the micrometer scale. The micro toothing between the housing parts of the centrifugal pump leads to a high degree of transverse stability. This makes it possible, for example, to dispense with additional transverse fixing elements. In addition, the micro-toothing leads to an unmistakable assignment of the individual housing segments of the centrifugal pump to one another. The microstructure enables an exact fit.

Vorzugsweise handelt es sich dabei um eine unregelmäßige Mikroverzahnung. Diese weist ineinander greifende, korrespondierende Formen auf.It is preferably an irregular micro-toothing. This has interlocking, corresponding forms.

Die erfindungsgemäße Kreiselpumpe zeichnet sich durch eine hohe Dichtheit auch bei hohen Förderdrücken aus. Zudem sind nach der Montage die Trennfugen zwischen den einzelnen Gehäuseteilen, im Gegensatz zu herkömmlichen Kreiselpumpen, nicht mehr sichtbar. Die Mikroverzahnung ermöglicht einen exakten Sitz, der eine optimale Krafteinleitung zwischen den einzelnen Gehäuseteilen ermöglicht.The centrifugal pump according to the invention is characterized by a high level of tightness even at high delivery pressures. In addition, unlike conventional centrifugal pumps, the joints between the individual housing parts are no longer visible after installation. The micro-toothing enables an exact fit, which enables an optimal transfer of force between the individual housing parts.

Die erfindungsgemäße Kreiselpumpe zeichnet sich durch eine sehr hohe Passgenauigkeit und eine große Belastbarkeit aus. Zudem wird die bei Kreiselpumpen häufig auftretende Spaltkorrosion verhindert.The centrifugal pump according to the invention is characterized by a very high accuracy of fit and a high load capacity. In addition, the crevice corrosion that often occurs in centrifugal pumps is prevented.

Erfindungsgemäß sind die Trennfugen als Bruchflächen ausgebildet, wobei es sich als vorteilhaft erweist, wenn es sich dabei um Sprödbruchflächen handelt.According to the invention, the parting lines are designed as fracture surfaces, it proving to be advantageous if these are brittle fracture surfaces.

Vorzugsweise wird ein Werkstoff für das Pumpengehäuse eingesetzt, der eine hohe Sprödigkeit besitzt. Es hat sich gezeigt, dass dies das Trennen begünstigt.Preferably, a material is used for the pump housing, which has a high brittleness. This has been shown to favor separation.

Das Pumpengehäuse wird zunächst in einem Stück, beispielsweise als Gussbauteil, gefertigt. Dann werden Sollbruchstellen eingebracht. Beispielsweise kann es sich dabei um Kerbstellen handeln, die durch Laser vorgenommen werden. Für das Trennen wird vorzugsweise ein Dorn in das Pumpengehäuse getrieben. Die Bruchebene wird durch eine gezielte Anordnung der Kerben ausgerichtet.The pump housing is first manufactured in one piece, for example as a cast component. Then predetermined breaking points are introduced. For example, these can be notch spots that are made by laser. A mandrel is preferably driven into the pump housing for the separation. The fracture plane is aligned by a targeted arrangement of the notches.

Bei einer besonders günstigen Ausführung der Erfindung werden die Sollbruchstellen so gewählt, dass die mikroverzahnten Trennfugen quer zur Welle der Kreiselpumpe verlaufen. Auf diese Weise wird ein Pumpengehäuse mit Querteilung geschaffen.In a particularly favorable embodiment of the invention, the predetermined breaking points are selected such that the micro-toothed parting lines run transversely to the shaft of the centrifugal pump. In this way, a pump housing with cross division is created.

Ergänzend oder alternativ können die Sollbruchstellen so angeordnet werden, dass die Trennfugen in einer Ebene zur Welle der Kreiselpumpe angeordnet sind. Erfindungsgemäß wird dadurch ein Pumpengehäuse mit einer Längsteilung geschaffen.Additionally or alternatively, the predetermined breaking points can be arranged so that the parting lines are arranged in one plane to the shaft of the centrifugal pump. According to the invention, this creates a pump housing with a longitudinal division.

Als besonders vorteilhaft hat es sich erwiesen, wenn bei dem Vorgang das Pumpengehäuse abgestützt wird. Dadurch lässt sich eine übermäßige Verformung im Bereich der Bruchebene vermeiden.It has proven to be particularly advantageous if the pump housing is supported during the process. This prevents excessive deformation in the area of the fracture plane.

Bei einer Variante der Erfindung verlaufen die mikroverzahnten Trennfugen durch einen Saugstutzen und/oder einen Druckstutzen der Kreiselpumpe. Vorzugsweise handelt es sich dabei um eine Längsteilung.In a variant of the invention, the micro-toothed parting lines run through a suction port and / or a pressure port of the centrifugal pump. This is preferably a longitudinal division.

Die Trennfugen können auch durch Gehäusebereiche verlaufen, durch welche die Welle herausgeführt wird. In diesen Bereichen ist zwischen Welle und Gehäuse eine Dichtung angeordnet.The joints can also run through housing areas through which the shaft is led out. In these areas, a seal is arranged between the shaft and the housing.

Bei einer besonders vorteilhaften Ausführung der Erfindung unterteilt mindestens eine Trennfuge das Gehäuse in ein Segment, welches das Laufrad umgibt und ein Segment, welches die Radial- und/oder Axiallager umgibt und somit das Lagergehäuse bildet.In a particularly advantageous embodiment of the invention, at least one parting line divides the housing into a segment which surrounds the impeller and a segment which surrounds the radial and / or axial bearings and thus forms the bearing housing.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der Beschreibung eines Ausführungsbeispiels anhand von Zeichnungen und aus den Zeichnungen selbst.Further features and advantages of the invention result from the description of an exemplary embodiment with reference to drawings and from the drawings themselves.

Dabei zeigt

Fig. 1
einen Schnitt durch ein Kreiselpumpengehäuse,
Fig. 2
eine Vergrößerung des Ausschnittes A gemäß Figur 1.
It shows
Fig. 1
a section through a centrifugal pump housing,
Fig. 2
an enlargement of section A according Figure 1 .

Fig. 1 zeigt eine Kreiselpumpe mit einem Laufrad 1, das an einer Welle 2 befestigt ist. Die Kreiselpumpe umfasst ein Gehäuse 3, welches einen mit Flüssigkeit gefüllten Raum 4 umgibt. Bei dem Gehäuse 3 handelt es sich im Ausführungsbeispiel um ein Spiralgehäuse. Das Laufrad 1 ist rotierbar in dem Gehäuse 3 angeordnet. Das Gehäuse 3 weist einen Saugstutzen 5 und einen Druckstutzen 6 auf. Fig. 1 shows a centrifugal pump with an impeller 1, which is attached to a shaft 2. The centrifugal pump comprises a housing 3, which surrounds a space 4 filled with liquid. In the exemplary embodiment, the housing 3 is a spiral housing. The impeller 1 is rotatably arranged in the housing 3. The housing 3 has a suction nozzle 5 and a pressure nozzle 6.

Die Welle 2 wird von einem Motor angetrieben, der in Figur 1 nicht dargestellt ist. Die Welle 2 wird von Lageranordnungen 7 geführt. Die Lageranordnungen 7 umfassen Radiallager und/oder Axiallager.The shaft 2 is driven by a motor which in Figure 1 is not shown. The shaft 2 is guided by bearing arrangements 7. The bearing arrangements 7 include radial bearings and / or axial bearings.

Das Gehäuse 3 ist im Ausführungsbeispiel quer zur Welle 2 geteilt. Ein Segment 8 des Gehäuses 3 umgibt das Laufrad 1 samt dem mit Flüssigkeit gefüllten Raum 4. Ein anderes Segment 9 des Gehäuses 3 umgibt einen Teil der Welle 2. Ein weiteres Segment 13 umgibt die Lageranordnungen 7, die Radial- und/oder Axiallager umfasst. Durch die Querteilung wird das Gehäuse 3 in die Segmente 8, 9 und 13 unterteilt.The housing 3 is divided across the shaft 2 in the embodiment. A segment 8 of the housing 3 surrounds the impeller 1 together with the liquid-filled space 4. Another segment 9 of the housing 3 surrounds a part of the shaft 2. Another segment 13 surrounds the bearing arrangements 7, which includes radial and / or axial bearings. The housing 3 is divided into segments 8, 9 and 13 by the transverse division.

Figur 2 zeigt eine vergrößerte Darstellung des Ausschnitts A gemäß Fig. 1. Zwischen den Segmenten 8 und 9 des Gehäuses 3 verläuft eine Trennfuge 10. Erfindungsgemäß weist die Trennfuge 10 unregelmäßige Mikroverzahnungen auf. Die Trennfuge 10 wird von zwei aneinander grenzenden Oberflächen gebildet. Die Oberflächen weisen Erhebungen 11 und Vertiefungen 12 auf. Bei den Erhebungen 11 und Vertiefungen 12 handelt es sich um ineinandergreifende, zu einander korrespondierende Formen im Mikrometermaßstab. Figure 2 shows an enlarged view of section A according to Fig. 1 . A separating joint 10 runs between the segments 8 and 9 of the housing 3 the parting line 10 has irregular micro-toothing. The parting line 10 is formed by two adjacent surfaces. The surfaces have elevations 11 and depressions 12. The elevations 11 and depressions 12 are interlocking, mutually corresponding shapes on the micrometer scale.

Im Ausführungsbeispiel wird die Trennfuge 10 von zwei Bruchoberflächen gebildet. Dabei handelt es sich um Sprödbruchoberflächen. Im Ausführungsbeispiel werden die Oberflächen durch Bruchtrennen erzeugt. Dabei wird in das Gehäuse 3 eine Sollbruchstelle als Kerbe eingebracht und dann mittels eines Dorns eine Kraft auf diese Sollbruchstelle ausgeübt, so dass das Gehäuse 3 bricht. Das Gehäuse 3 wird in ein Segment 8, ein Segment 9 und ein Segment 13 unterteilt. Das Segment 8 umgibt das Laufrad 1 und das Fördermedium. Das Segment 9 umgibt ein Teil der Welle 2. Das Segment 13 umgibt die Lageranordnung 7, die Radial- und Axiallager umfasst.In the exemplary embodiment, the parting line 10 is formed by two fracture surfaces. These are brittle fracture surfaces. In the exemplary embodiment, the surfaces are generated by fracture separation. A predetermined breaking point is introduced as a notch in the housing 3 and then a force is exerted on this predetermined breaking point by means of a mandrel, so that the housing 3 breaks. The housing 3 is divided into a segment 8, a segment 9 and a segment 13. The segment 8 surrounds the impeller 1 and the medium. The segment 9 surrounds part of the shaft 2. The segment 13 surrounds the bearing arrangement 7, which comprises radial and axial bearings.

Claims (8)

  1. Centrifugal pump having at least one impeller (1) which is connected rotationally conjointly to a shaft (2), and having a casing (3) which has parting joints (10),
    characterized in that
    the parting joints (10) have micro-toothings, wherein the parting joints (10) are formed by fracture surfaces.
  2. Centrifugal pump according to Claim 1, characterized in that the parting joints (10) have non-uniformly distributed micro-toothings.
  3. Centrifugal pump according to Claim 1 or 2, characterized in that the parting joints (10) are formed by surfaces which have elevations (11) and depressions (12) which are formed as corresponding shapes.
  4. Centrifugal pump according to Claim 1, 2 or 3, characterized in that the parting joints (10) are formed by brittle fracture surfaces.
  5. Centrifugal pump according to one of Claims 1 to 4, characterized in that the parting joints (10) are arranged transversely with respect to the shaft (2).
  6. Centrifugal pump according to one of Claims 1 to 5, characterized in that the parting joints (10) are arranged in a plane with respect to the shaft (2).
  7. Centrifugal pump according to one of Claims 1 to 6, characterized in that the parting joints (10) extend through a suction connector (5) and/or a pressure connector (6).
  8. Centrifugal pump according to one of Claims 1 to 7, characterized in that at least one parting joint (10) subdivides the housing (3) into a segment (8) which at least partially surrounds the impeller (1) and into at least one segment (9, 13) which surrounds a portion of the shaft (2) and/or at least one bearing arrangement (7).
EP15774925.0A 2014-10-08 2015-10-06 Centrifugal pump Active EP3204651B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220364.3A DE102014220364A1 (en) 2014-10-08 2014-10-08 rotary pump
PCT/EP2015/072993 WO2016055444A1 (en) 2014-10-08 2015-10-06 Centrifugal pump

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Publication Number Publication Date
EP3204651A1 EP3204651A1 (en) 2017-08-16
EP3204651B1 true EP3204651B1 (en) 2020-05-13

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EP15774925.0A Active EP3204651B1 (en) 2014-10-08 2015-10-06 Centrifugal pump

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DE (1) DE102014220364A1 (en)
DK (1) DK3204651T3 (en)
ES (1) ES2809520T3 (en)
WO (1) WO2016055444A1 (en)

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EP3204651A1 (en) 2017-08-16
WO2016055444A1 (en) 2016-04-14
DE102014220364A1 (en) 2016-04-14
DK3204651T3 (en) 2020-08-03
ES2809520T3 (en) 2021-03-04

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