EP3234371B1 - Centrifugal pump impeller - Google Patents

Centrifugal pump impeller Download PDF

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Publication number
EP3234371B1
EP3234371B1 EP15813022.9A EP15813022A EP3234371B1 EP 3234371 B1 EP3234371 B1 EP 3234371B1 EP 15813022 A EP15813022 A EP 15813022A EP 3234371 B1 EP3234371 B1 EP 3234371B1
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EP
European Patent Office
Prior art keywords
impeller
centrifugal pump
metallic
hub
sleeves
Prior art date
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Application number
EP15813022.9A
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German (de)
French (fr)
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EP3234371A1 (en
Inventor
Ralf Kramme
Christian Schmidt
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KSB SE and Co KGaA
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KSB SE and Co KGaA
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Publication of EP3234371A1 publication Critical patent/EP3234371A1/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
    • F04D29/02—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
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F04D29/2227—Construction and assembly for special materials
    • 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • 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
    • F05D2300/20—Oxide or non-oxide ceramics
    • F05D2300/22—Non-oxide ceramics
    • F05D2300/226—Carbides
    • F05D2300/2261—Carbides of silicon
    • 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
    • F05D2300/6033—Ceramic matrix composites [CMC]

Definitions

  • the invention relates to a centrifugal pump impeller with a non-metallic impeller part and a metallic hub part connected to the impeller part, which is arranged on a shaft, with a releasable connection between the impeller part and the hub part, the impeller part and the hub part being releasably connected to one another via driver elements.
  • Centrifugal pump impellers which are made entirely of metal, are usually attached to a shaft by pushing their hub bore onto a shaft end and pressing them against a collar of the shaft using a nut. Such a fastening method is disadvantageous in the case of centrifugal pump impellers according to the preamble of the invention, since they comprise a non-metallic impeller part. Many non-metallic materials, such as polymer casting or plastic, tend to flow under pressure.
  • centrifugal pump impeller which comprises a non-metallic impeller part and a metallic hub part.
  • Hub parts are components that are arranged on and surround the drive shaft.
  • the hub part is provided with a central receiving opening.
  • the receiving opening has a thread into which the shaft end can be screwed.
  • the impeller part made of plastic is molded onto the hub part.
  • the hub part has a ring which is perforated and is extrusion-coated with the plastic material of the impeller part.
  • This centrifugal pump impeller has a non-detachable connection between the hub part and the impeller part.
  • DD 18 758 describes a completely different way of attaching impellers made of a ceramic material.
  • this method does not use a hub part.
  • An intermediate flange is used instead of a hub part.
  • This intermediate flange is arranged between the shaft end and the impeller.
  • the impeller and the intermediate flange are drilled.
  • a screw bolt is arranged in the bore and has a head at one end and a thread at the other end, onto which a nut is screwed.
  • the impeller and the intermediate flange are clamped against each other by screwing a nut onto the thread.
  • the intermediate flange is in turn connected to the shaft by means of a screw connection.
  • the shaft is formed at one end with a flange ring, in which the bores for the screw connections between the flange and the shaft are arranged.
  • This construction of the attachment using an intermediate flange is very complex and bulky, since, in contrast to a hub part, the intermediate flange is not arranged on the shaft, but rather is located at the shaft end between the shaft and the impeller.
  • the DE 2 319 463 describes a rotor for a pump for cooling internal combustion engines.
  • the rotor consists of a metallic hub part that is pushed onto the shaft in a press fit.
  • the impeller part is poured onto this metallic hub part.
  • the impeller part consists of a thermosetting resin mixture. With this construction, too, a permanent, non-detachable bond is produced between the hub part and the impeller part.
  • the DE 76 10 913 describes a centrifugal pump with a plastic impeller.
  • a circular disk made of a metal is arranged in the hub area of the impeller.
  • the impeller has a metal bush for storage, to which the circular disc is attached.
  • the circular disc is completely embedded in the plastic of the impeller. There is therefore an inseparable unit between the plastic impeller and the metallic circular disc.
  • a centrifugal pump impeller is known with a non-metallic impeller part and an associated metallic hub part, wherein between Impeller part and hub part is a detachable connection.
  • the impeller part is fixed to the hub part by means of a plastically deformable part.
  • the WO 2013/000032 A1 discloses a ceramic impeller with a conveying part, an inner back vane part and an outer back vane part, the conveying part comprising the main blades for conveying the medium.
  • a metallic hub is arranged between the conveying part and the inner back vane part.
  • liquid polyurethane resin is poured between the hub and the conveying part, which, after cooling, is used to connect the conveying part to the hub and to dampen impacts.
  • the inner back vane part is screwed onto the conveying part by means of screws.
  • the DE 895 250 C. describes a ceramic impeller on the back of which a hub is formed, onto which a metallic sleeve is applied, which serves to connect the impeller to its drive shaft.
  • the object of the invention is to provide a centrifugal pump impeller which can be inexpensively repaired when wear and tear occurs. In addition, the repair work should be carried out quickly and inexpensively.
  • the centrifugal pump impeller should be able to be manufactured at a low cost and be of high quality.
  • driver elements each have a sleeve and a connecting element and the sleeves are arranged in recesses on an end face of the impeller part.
  • the non-metallic impeller part is therefore not cast around the metallic hub part. Instead, the impeller part and the hub part are detachably connected to one another via driver elements.
  • the hub part is preferably a one-piece metallic component.
  • the driver elements are designed in several parts. It is preferably a two-part design. According to the invention, the driver elements each have a sleeve and a connecting element with which a reliable screw connection can be produced.
  • the sleeves are arranged in depressions on one end face, in particular the shaft end face, of the impeller part.
  • the depressions are preferably bores which are made in the non-metallic impeller part, round bores being particularly suitable.
  • a plurality of bores can be made on the end face, for example in the region of the carrier plate, of the impeller part along a circular arrangement. It proves to be advantageous if the number of bores corresponds to the number of blades of the impeller part.
  • the depressions are preferably introduced at positions of the carrier plate at which the blades engage.
  • the sleeves of the driver elements are placed in the indentations and fastened there.
  • the sleeves can, for example, be pressed and / or glued into the depressions. The sleeves sit in the recesses of the impeller part without play.
  • the sleeves are cast on one end face of the impeller part. This eliminates the need for drilling.
  • the sleeves have a suitable anti-rotation device.
  • the connecting elements are arranged on a ring of the hub part and at least partially engage in the sleeves.
  • the connecting elements are preferably screwed into the sleeves. This creates a reliable connection between the impeller part and the hub part.
  • the connecting elements are preferably screws.
  • the sleeves are provided with an internal thread, into which the external thread of the connecting elements designed as screws engages.
  • the screws preferably have a conical shoulder and are placed in bores on the ring of the hub part and then screwed into the sleeves.
  • the bores have countersinks which are designed to be complementary to the cone approaches. This creates a backlash-free or largely backlash-free construction in which the individual parts of the driver elements are detachably connected to one another.
  • Another advantage of the construction according to the invention is that no more stresses occur in the centrifugal pump impeller according to the invention, which occur in conventional centrifugal pump impellers made of polymer casting due to the different thermal expansion values of the impeller part and the hub part.
  • the hub part preferably has a projection which projects into the impeller part.
  • This projection is designed as a hollow cylinder and surrounds the shaft. This ring is connected to this hollow cylindrical projection of the hub part.
  • the ring of the hub part is aligned parallel to the shaft-side end face of the impeller part and lies against the end face of the impeller part.
  • this ring is adjoined by an extension which is also hollow-cylindrical and thus surrounds the shaft.
  • the metallic hub part preferably has on its inside at least one groove into which a feather key engages, which establishes a connection between the shaft and the hub part for torque transmission.
  • a disc is arranged on a shaft end for fixing the impeller part.
  • the non-metallic impeller part preferably has a circular recess on the flow side, into which the disk is positioned.
  • the disk has bores, for example along its circumference.
  • the disc is attached to the shaft end by means of suitable screws. As a result, the hub part and the impeller part are braced against each other.
  • centrifugal pump impeller When assembling the centrifugal pump impeller, proceed as follows: First, the metallic hub part and the non-metallic impeller part are connected. The pre-assembled two-part centrifugal pump impeller is pushed onto the shaft end. Then the impeller part and hub part are braced against each other by means of the disk which is attached to the shaft end.
  • a cap is preferably arranged on the flow side on the disk. Since the cap comes into contact with flow medium, it is usually made of a corrosion-resistant material.
  • the impeller part consists of a ceramic material.
  • a ceramic-plastic composite is preferably suitable for this. It proves to be particularly advantageous if this comprises silicon carbide particles which are arranged in a polymer matrix.
  • the metallic hub part is preferably made of a rustproof duplex cast steel.
  • Fig. 1 shows a centrifugal pump impeller 1, which is arranged in a housing 2 of a centrifugal pump.
  • the housing 2 comprises a suction opening 3, through the medium is sucked in and conveyed by means of the centrifugal pump impeller 1 in the direction of an outflow opening 4 and then leaves the centrifugal pump.
  • the centrifugal pump impeller 1 is arranged on a shaft 5.
  • the shaft 5 is set in rotation by a motor, not shown.
  • the torque is transmitted to the metallic hub part 8 via two feather keys 6 and to the non-metallic impeller part 7 of the centrifugal pump impeller 1 via the driver elements 12.
  • the centrifugal pump impeller 1 consists of a non-metallic impeller part 7 and a metallic hub part 8.
  • the non-metallic impeller part 7 is made of a ceramic-plastic composite material in which silicon carbide particles are embedded in a polymer matrix.
  • the hub part 8 is made of a rust-free duplex cast steel, which has a ferritic-austenitic structure.
  • the non-metallic impeller part 7 is made in one piece and is produced in the casting process. It has a carrier plate 9, on which blades 10 are molded. In the exemplary embodiment, it is a radial centrifugal pump impeller.
  • Fig. 2 shows a perspective exploded view of the centrifugal pump impeller 1 with the end of the shaft 5.
  • the non-metallic impeller part 7 has depressions 11.
  • the depressions 11 are bores which are introduced into the impeller part 7 after or before they have completely hardened or are then finished if they were already pre-cast during manufacture.
  • Fig. 3 shows that engaging elements 12 engage in the recesses 11 in the assembled state.
  • Each driver element 12 consists of a sleeve 13 and a connecting element 14.
  • the sleeve 13 is a hollow cylindrical body which is closed on one end face.
  • Each sleeve 13 has an internal thread.
  • the connecting element 14 is designed as a screw which has an external thread.
  • the sleeves 13 can be cast in on the shaft-side end face of the impeller part 7.
  • Fig. 2 shows that the hub part 8 has a ring 15 which is provided with a plurality of bores 16 along its circumference.
  • connecting elements 14 are inserted into the bores 16 and screwed into the sleeves 13, which are arranged in the recesses 11, and secured.
  • screws 20 can also be screwed into additional threaded sleeves or threaded bores 21 provided in the non-metallic material of the impeller part 7 and serve, for example, as a transport lock or assembly aid if the sleeves 13 are not pressed or glued into the recesses 11 are.
  • the pre-assembled centrifugal pump impeller is pushed onto the end of shaft 5.
  • the shaft 5 is connected in a rotationally fixed manner to the hub part 8 via the feather keys 6, the feather keys 6 engaging in grooves 17 of the hub part 8.
  • the grooves 17 extend in the axial direction in the interior of the hub part 8.
  • a washer 23 is fastened to the end face of the shaft 5 by means of screws 24.
  • bores 25 are made in the disk, through which the screws 24 are inserted and then engage in bores with an internal thread on the end face of the shaft 5.
  • the screws 24 are cylinder screws.
  • the cap 26 is screwed into a central bore 27 which is provided with an internal thread.
  • the cap 26 has a pin 28 which is provided with an external thread.
  • Fig. 3 shows that an elastomer ring 29 can be arranged between the disk 23 and the impeller part 7. By tightening the screws 24, this elastomer ring 29 is braced. Thus, a "flow" of the non-metallic impeller part 7 is prevented.
  • an O-ring 30 is arranged between the cap 26 and the disk 23.
  • An O-ring 31 is located between the cap 26 and the impeller part 7.
  • An O-ring 32 is also arranged between the ring 15 of the hub part 8 and the surface 19 of the impeller part 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Die Erfindung betrifft ein Kreiselpumpenlaufrad mit einem nichtmetallischen Laufradteil und einem mit dem Laufradteil verbundenen metallischen Nabenteil, das auf einer Welle angeordnet ist, wobei zwischen Laufradteil und Nabenteil eine lösbare Verbindung besteht, wobei Laufradteil und Nabenteil über Mitnehmerelemente lösbar miteinander verbunden sind.The invention relates to a centrifugal pump impeller with a non-metallic impeller part and a metallic hub part connected to the impeller part, which is arranged on a shaft, with a releasable connection between the impeller part and the hub part, the impeller part and the hub part being releasably connected to one another via driver elements.

Kreiselpumpenlaufräder, die vollständig aus Metall bestehen, werden gewöhnlich auf einer Welle dadurch befestigt, dass sie mit ihrer Nabenbohrung auf ein Wellenende aufgeschoben werden und durch eine Mutter gegen einen Bund der Welle gepresst werden. Eine solche Befestigungsmethode ist bei Kreiselpumpenlaufrädern gemäß dem Oberbegriff der Erfindung unvorteilhaft, da diese einen nichtmetallischen Laufradteil umfassen. Viele nichtmetallische Materialien, wie beispielsweise Polymerguss oder Kunststoff, neigen unter Druckbelastung zum Fließen.Centrifugal pump impellers, which are made entirely of metal, are usually attached to a shaft by pushing their hub bore onto a shaft end and pressing them against a collar of the shaft using a nut. Such a fastening method is disadvantageous in the case of centrifugal pump impellers according to the preamble of the invention, since they comprise a non-metallic impeller part. Many non-metallic materials, such as polymer casting or plastic, tend to flow under pressure.

In der DE 44 44 965 A1 wird ein Kreiselpumpenlaufrad beschrieben, das ein nichtmetallisches Laufradteil und ein metallisches Nabenteil umfasst. Nabenteile sind Bauteile die auf der Antriebswelle angeordnet sind und diese umgeben. Das Nabenteil ist mit einer zentrischen Aufnahmeöffnung versehen. Die Aufnahmeöffnung weist ein Gewinde auf, in die das Wellenende einschraubbar ist. Das Laufradteil aus einem Kunststoff ist am Nabenteil angeformt. Das Nabenteil weist dazu einen Ring auf, der perforiert ausgebildet ist und mit dem Kunststoffmaterial des Laufradteils umspritzt wird. Bei diesem Kreiselpumpenlaufrad besteht eine nicht lösbare Verbindung zwischen Nabenteil und Laufradteil.In the DE 44 44 965 A1 describes a centrifugal pump impeller which comprises a non-metallic impeller part and a metallic hub part. Hub parts are components that are arranged on and surround the drive shaft. The hub part is provided with a central receiving opening. The receiving opening has a thread into which the shaft end can be screwed. The impeller part made of plastic is molded onto the hub part. For this purpose, the hub part has a ring which is perforated and is extrusion-coated with the plastic material of the impeller part. This centrifugal pump impeller has a non-detachable connection between the hub part and the impeller part.

In der DD 18 758 wird eine völlig andere Möglichkeit zur Befestigung von Laufrädern aus einem keramischen Werkstoff beschrieben. Bei dieser Methode kommt, im Gegensatz zu Kreiselpumpenlaufrädern gemäß dem Oberbegriff der Erfindung, kein Nabenteil zum Einsatz. Anstelle eines Nabenteils wird ein Zwischenflansch eingesetzt. Dieser Zwischenflansch ist zwischen dem Wellenende und dem Laufrad angeordnet. Das Laufrad und der Zwischenflansch sind mit einer Bohrung versehen. In der Bohrung ist ein Schraubbolzen angeordnet, der an einem Ende mit einem Kopf und an dem anderen Ende mit einem Gewinde versehen ist, auf das eine Mutter aufgeschraubt wird. Durch Aufdrehen einer Mutter auf das Gewinde werden das Laufrad und der Zwischenflansch gegeneinander verspannt. Der Zwischenflansch seinerseits ist über eine Verschraubung mit der Welle verbunden. Dazu ist die Welle an einem Ende mit einem Flanschring ausgebildet, in dem die Bohrungen für die Schraubverbindungen zwischen Flansch und Welle angeordnet sind. Diese Konstruktion der Befestigung mithilfe eines Zwischenflansches ist sehr aufwendig und sperrig, da der Zwischenflansch im Gegensatz zu einem Nabenteil nicht auf der Welle angeordnet ist, sondern am Wellenende zwischen der Welle und dem Laufrad platziert ist.In the DD 18 758 describes a completely different way of attaching impellers made of a ceramic material. In contrast to centrifugal pump impellers according to the preamble of the invention, this method does not use a hub part. An intermediate flange is used instead of a hub part. This intermediate flange is arranged between the shaft end and the impeller. The impeller and the intermediate flange are drilled. A screw bolt is arranged in the bore and has a head at one end and a thread at the other end, onto which a nut is screwed. The impeller and the intermediate flange are clamped against each other by screwing a nut onto the thread. The intermediate flange is in turn connected to the shaft by means of a screw connection. For this purpose, the shaft is formed at one end with a flange ring, in which the bores for the screw connections between the flange and the shaft are arranged. This construction of the attachment using an intermediate flange is very complex and bulky, since, in contrast to a hub part, the intermediate flange is not arranged on the shaft, but rather is located at the shaft end between the shaft and the impeller.

Die DE 2 319 463 beschreibt einen Rotor für eine Pumpe zur Kühlung von Verbrennungsmotoren. Der Rotor besteht aus einem metallischen Nabenteil, das auf die Welle im Presssitz aufgeschoben wird. Auf dieses metallische Nabenteil wird das Laufradteil aufgegossen. Das Laufradteil besteht aus einer thermohärtbaren Harzmischung. Auch bei dieser Konstruktion wird ein nicht lösbarer, fester Verbund zwischen Nabenteil und Laufradteil hergestellt.The DE 2 319 463 describes a rotor for a pump for cooling internal combustion engines. The rotor consists of a metallic hub part that is pushed onto the shaft in a press fit. The impeller part is poured onto this metallic hub part. The impeller part consists of a thermosetting resin mixture. With this construction, too, a permanent, non-detachable bond is produced between the hub part and the impeller part.

Die DE 76 10 913 beschreibt eine Kreiselpumpe mit einem Laufrad aus Kunststoff. Im Nabenbereich des Laufrades ist eine Kreisscheibe aus einem Metall angeordnet. Das Laufrad weist zur Lagerung eine Metallbuchse auf, an der die Kreisscheibe befestigt ist. Die Kreisscheibe ist vollständig in den Kunststoff des Laufrades eingebettet. Somit besteht eine unlösbare Einheit zwischen dem Kunststofflaufrad und der metallischen Kreisscheibe.The DE 76 10 913 describes a centrifugal pump with a plastic impeller. A circular disk made of a metal is arranged in the hub area of the impeller. The impeller has a metal bush for storage, to which the circular disc is attached. The circular disc is completely embedded in the plastic of the impeller. There is therefore an inseparable unit between the plastic impeller and the metallic circular disc.

Aus der JP 2005-291116 A ist ein Kreiselpumpenlaufrad mit einem nichtmetallischen Laufradteil und einem damit verbundenen metallischen Nabenteil bekannt, wobei zwischen Laufradteil und Nabenteil eine lösbare Verbindung besteht. Das Laufradteil wird mittels eines plastisch deformierbaren Teils an dem Nabenteil fixiert.From the JP 2005-291116 A a centrifugal pump impeller is known with a non-metallic impeller part and an associated metallic hub part, wherein between Impeller part and hub part is a detachable connection. The impeller part is fixed to the hub part by means of a plastically deformable part.

Die WO 2013/000032 A1 offenbart ein keramisches Laufrad mit einem fördernden Teil, einem inneren Rückenschaufelteil und einem äußeren Rückenschaufelteil, wobei das fördernde Teil die Hauptschaufeln zum Fördern des Mediums umfasst. Zwischen dem fördernden Teil und dem inneren Rückenschaufelteil ist eine metallische Nabe angeordnet. Bei der Montage wird flüssiges Polyurethanharz zwischen Nabe und förderndem Teil gegossen, welches nach dem Abkühlen zum Verbinden des fördernden Teils mit der Nabe und zum Dämpfen von Stößen dient. Das innere Rückenschaufelteil wird mittels Schrauben an das fördernde Teil angeschraubt.The WO 2013/000032 A1 discloses a ceramic impeller with a conveying part, an inner back vane part and an outer back vane part, the conveying part comprising the main blades for conveying the medium. A metallic hub is arranged between the conveying part and the inner back vane part. During assembly, liquid polyurethane resin is poured between the hub and the conveying part, which, after cooling, is used to connect the conveying part to the hub and to dampen impacts. The inner back vane part is screwed onto the conveying part by means of screws.

Die DE 895 250 C beschreibt ein keramisches Laufrad an dessen Rückseite eine Nabe angeformt ist, auf die eine metallische Hülse aufgebracht ist, die zur Verbindung des Laufrades mit dessen Antriebswelle dient.The DE 895 250 C. describes a ceramic impeller on the back of which a hub is formed, onto which a metallic sleeve is applied, which serves to connect the impeller to its drive shaft.

In der CN 200958487 Y wird ein Laufrad für eine mehrstufige Pumpe beschrieben, wobei das Laufrad an einer an der Welle fixierten Dehnungshülse befestigt wird.In the CN 200958487 Y describes an impeller for a multi-stage pump, the impeller being attached to an expansion sleeve fixed to the shaft.

Aufgabe der Erfindung ist es, ein Kreiselpumpenlaufrad anzugeben, das beim Auftreten von Verschleißerscheinungen kostengünstig wieder instand gesetzt werden kann. Zudem sollen die Instandsetzungsarbeiten schnell und kostengünstig durchgeführt werden können. Das Kreiselpumpenlaufrad soll mit einem geringen Kostenaufwand gefertigt werden können und dabei eine hohe Qualität aufweisen.The object of the invention is to provide a centrifugal pump impeller which can be inexpensively repaired when wear and tear occurs. In addition, the repair work should be carried out quickly and inexpensively. The centrifugal pump impeller should be able to be manufactured at a low cost and be of high quality.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Mitnehmerelemente jeweils eine Hülse und ein Verbindungselement aufweisen und die Hülsen in Vertiefungen an einer Stirnseite des Laufradteils angeordnet sind.This object is achieved in that the driver elements each have a sleeve and a connecting element and the sleeves are arranged in recesses on an end face of the impeller part.

Im Gegensatz zu herkömmlichen Kreiselpumpenlaufrädern wird somit das nichtmetallische Laufradteil nicht um das metallische Nabenteil herum gegossen. Stattdessen sind Laufradteil und Nabenteil über Mitnehmerelemente lösbar miteinander verbunden. Bei dem Nabenteil handelt es sich vorzugsweise um ein einstückig ausgebildetes metallisches Bauteil.In contrast to conventional centrifugal pump impellers, the non-metallic impeller part is therefore not cast around the metallic hub part. Instead, the impeller part and the hub part are detachably connected to one another via driver elements. At the hub part is preferably a one-piece metallic component.

Die Mitnehmerelemente sind mehrteilig ausgebildet. Vorzugsweise handelt es sich um eine zweiteilige Ausführung. Erfindungsgemäß weisen die Mitnehmerelemente jeweils eine Hülse und ein Verbindungselement auf, mit denen sich eine zuverlässige Schraubverbindung herstellen lässt.The driver elements are designed in several parts. It is preferably a two-part design. According to the invention, the driver elements each have a sleeve and a connecting element with which a reliable screw connection can be produced.

Erfindungsgemäß sind die Hülsen in Vertiefungen an einer Stirnseite, insbesondere der wellenseitigen Stirnseite, des Laufradteils angeordnet. Vorzugsweise handelt es sich bei den Vertiefungen um Bohrungen, die in das nichtmetallische Laufradteil eingebracht werden, wobei sich insbesondere runde Bohrungen eignen. Dazu können entlang einer kreisförmigen Anordnung mehrere Bohrungen an der Stirnseite, beispielsweise im Bereich der Trägerplatte, des Laufradteils eingebracht werden. Dabei erweist es sich als günstig, wenn die Anzahl der Bohrungen der Anzahl der Schaufeln des Laufradteils entspricht. Zudem sind die Vertiefungen vorzugsweise an Positionen der Trägerplatte eingebracht, an denen die Schaufeln angreifen. Nach dem Einbringen der Vertiefungen in das nichtmetallische Laufradteil, werden die Hülsen der Mitnehmerelemente in die Vertiefungen platziert und dort befestigt. Dazu können die Hülsen in die Vertiefungen beispielsweise eingepresst und/oder eingeklebt werden. Dabei sitzen die Hülsen spielfrei in den Vertiefungen des Laufradteils.According to the invention, the sleeves are arranged in depressions on one end face, in particular the shaft end face, of the impeller part. The depressions are preferably bores which are made in the non-metallic impeller part, round bores being particularly suitable. For this purpose, a plurality of bores can be made on the end face, for example in the region of the carrier plate, of the impeller part along a circular arrangement. It proves to be advantageous if the number of bores corresponds to the number of blades of the impeller part. In addition, the depressions are preferably introduced at positions of the carrier plate at which the blades engage. After the indentations have been introduced into the non-metallic impeller part, the sleeves of the driver elements are placed in the indentations and fastened there. For this purpose, the sleeves can, for example, be pressed and / or glued into the depressions. The sleeves sit in the recesses of the impeller part without play.

Alternativ ist es vorteilhaft, wenn die Hülsen an einer Stirnseite des Laufradteils eingegossen sind. Dadurch kann auf den Arbeitsgang des Bohrens verzichtet werden.Alternatively, it is advantageous if the sleeves are cast on one end face of the impeller part. This eliminates the need for drilling.

In beiden Fällen ist es vorteilhaft, wenn die Hülsen eine geeignete Verdrehsicherung aufweisen.In both cases it is advantageous if the sleeves have a suitable anti-rotation device.

In weiterer Ausgestaltung sind die Verbindungselemente an einem Ring des Nabenteils angeordnet und greifen zumindest teilweise in die Hülsen ein. Vorzugsweise sind die Verbindungselemente in die Hülsen eingeschraubt. Dadurch wird eine zuverlässige Verbindung zwischen Laufradteil und Nabenteil hergestellt.In a further embodiment, the connecting elements are arranged on a ring of the hub part and at least partially engage in the sleeves. The connecting elements are preferably screwed into the sleeves. This creates a reliable connection between the impeller part and the hub part.

Vorzugsweise handelt es sich bei den Verbindungselementen um Schrauben. Bei dieser Variante sind die Hülsen mit einem Innengewinde versehen, in das das Außengewinde der als Schrauben ausgeführten Verbindungselemente eingreift.The connecting elements are preferably screws. In this variant, the sleeves are provided with an internal thread, into which the external thread of the connecting elements designed as screws engages.

Die Schrauben weisen vorzugsweise einen Kegelansatz auf und werden in Bohrungen am Ring des Nabenteils platziert und dann in die Hülsen eingeschraubt. Die Bohrungen weisen komplementär zu den Kegelansätzen ausgebildete Senkansätze auf. Dadurch entsteht eine spielfreie oder weitgehend spielfreie Konstruktion, bei der die Einzelteile der Mitnehmerelemente lösbar miteinander verbunden sind.The screws preferably have a conical shoulder and are placed in bores on the ring of the hub part and then screwed into the sleeves. The bores have countersinks which are designed to be complementary to the cone approaches. This creates a backlash-free or largely backlash-free construction in which the individual parts of the driver elements are detachably connected to one another.

Durch dieses erfindungsgemäße Konzept der Zweiteilung der Mitnehmerelemente mit einer Hülse, die nicht lösbar in einer Vertiefung des nichtmetallischen Laufradteils festgelegt ist und einem Verbindungselement, das eine lösbare Verbindung zwischen der Hülse und dem metallischen Nabenteil herstellt, ist es möglich, bei Verschleißerscheinungen am Kreiselpumpenlaufrad lediglich das nichtmetallische Laufradteil samt der darin angeordneten Hülsen auszutauschen und das metallische Nabenteil weiter zu verwenden. Dies ist insbesondere deshalb günstig, da die Verschleißerscheinungen in erster Linie an dem nichtmetallischen Laufradteil auftreten. Insbesondere an den Schaufeln des Laufradteils, die in direktem Kontakt mit teilweise aggressiven Strömungsmedien stehen, treten Abnutzungserscheinungen auf. Es ist erheblich günstiger, nur das nichtmetallische Laufradteil auszutauschen als das gesamte Kreiselpumpenlaufrad mitsamt dem metallischen Nabenteil.Through this inventive concept of the two-part of the driver elements with a sleeve that is non-releasably fixed in a recess of the non-metallic impeller part and a connecting element that creates a detachable connection between the sleeve and the metallic hub part, it is only possible in the event of signs of wear on the centrifugal pump impeller replace the non-metallic impeller part together with the sleeves arranged in it and continue to use the metallic hub part. This is particularly advantageous because the signs of wear occur primarily on the non-metallic impeller part. Signs of wear occur in particular on the blades of the impeller part, which are in direct contact with sometimes aggressive flow media. It is considerably cheaper to replace only the non-metallic impeller part than the entire centrifugal pump impeller together with the metallic hub part.

Ein weiterer Vorteil der erfindungsgemäßen Konstruktion besteht darin, dass keine Spannungen mehr in dem erfindungsgemäßen Kreiselpumpenlaufrad auftreten, die bei herkömmlichen Kreiselpumpenlaufrädern aus Polymerguss, aufgrund der unterschiedlichen Wärmeausdehnungswerte von Laufradteil und Nabenteil, beim Eingießen zustande kommen.Another advantage of the construction according to the invention is that no more stresses occur in the centrifugal pump impeller according to the invention, which occur in conventional centrifugal pump impellers made of polymer casting due to the different thermal expansion values of the impeller part and the hub part.

Vorzugsweise weist das Nabenteil einen Vorsprung auf, der in das Laufradteil hineinragt. Dieser Vorsprung ist hohlzylinderförmig ausgeführt und umgibt die Welle. An diesen hohlzylindrigen Vorsprung des Nabenteils schließt sich dessen Ring an.The hub part preferably has a projection which projects into the impeller part. This projection is designed as a hollow cylinder and surrounds the shaft. This ring is connected to this hollow cylindrical projection of the hub part.

Während der Vorsprung in die Nabe des Laufradteils hineinragt, ist der Ring des Nabenteils parallel zu der wellenseitigen Stirnseite des Laufradteils ausgerichtet und liegt an der stirnseitigen Fläche des Laufradteils an.While the projection protrudes into the hub of the impeller part, the ring of the hub part is aligned parallel to the shaft-side end face of the impeller part and lies against the end face of the impeller part.

Bei einer Variante der Erfindung schließt sich an diesen Ring noch ein Fortsatz an, der ebenfalls hohlzylinderförmig ausgebildet ist und somit die Welle umgibt.In a variant of the invention, this ring is adjoined by an extension which is also hollow-cylindrical and thus surrounds the shaft.

Vorzugsweise weist das metallische Nabenteil an seiner Innenseite mindestens eine Nut auf, in die eine Passfeder eingreift, welche eine Verbindung zwischen Welle und Nabenteil zur Drehmomentübertragung herstellt.The metallic hub part preferably has on its inside at least one groove into which a feather key engages, which establishes a connection between the shaft and the hub part for torque transmission.

Bei einer Variante der Erfindung ist zur Fixierung des Laufradteils an einem Wellenende eine Scheibe angeordnet. Dazu weist das nichtmetallische Laufradteil vorzugsweise strömungsseitig eine kreisförmige Aussparung auf, in die die Scheibe positioniert wird. Die Scheibe weist Bohrungen, beispielsweise entlang ihres Umfangs, auf. Mittels geeigneter Schrauben wird die Scheibe über die Bohrungen am Wellenende befestigt. Dadurch werden das Nabenteil und das Laufradteil gegeneinander verspannt.In a variant of the invention, a disc is arranged on a shaft end for fixing the impeller part. For this purpose, the non-metallic impeller part preferably has a circular recess on the flow side, into which the disk is positioned. The disk has bores, for example along its circumference. The disc is attached to the shaft end by means of suitable screws. As a result, the hub part and the impeller part are braced against each other.

Bei der Montage des Kreiselpumpenlaufrads wird wie folgt vorgegangen:
Zunächst werden das metallische Nabenteil und das nichtmetallische Laufradteil verbunden. Das vormontierte zweiteilige Kreiselpumpenlaufrad wird auf das Wellenende geschoben.
Dann werden das Laufradteil und Nabenteil mittels der Scheibe gegeneinander verspannt, die am Wellenende befestigt wird.When assembling the centrifugal pump impeller, proceed as follows:
First, the metallic hub part and the non-metallic impeller part are connected. The pre-assembled two-part centrifugal pump impeller is pushed onto the shaft end.
Then the impeller part and hub part are braced against each other by means of the disk which is attached to the shaft end.

Vorzugsweise ist auf der Scheibe strömungsseitig eine Kappe angeordnet. Da die Kappe mit Strömungsmedium in Kontakt kommt, ist sie in der Regel aus einem korrosionsbeständigen Material gefertigt.A cap is preferably arranged on the flow side on the disk. Since the cap comes into contact with flow medium, it is usually made of a corrosion-resistant material.

Das Laufradteil besteht bei einer besonders günstigen Ausführung der Erfindung aus einem keramischen Werkstoff. Vorzugsweise eignet sich dazu ein Keramik-Kunststoff-Verbundwerkstoff. Dabei erweist es sich als besonders günstig, wenn dieser Siliziumcarbidteilchen umfasst, die in einer Polymermatrix angeordnet sind.In a particularly favorable embodiment of the invention, the impeller part consists of a ceramic material. A ceramic-plastic composite is preferably suitable for this. It proves to be particularly advantageous if this comprises silicon carbide particles which are arranged in a polymer matrix.

Das metallische Nabenteil besteht vorzugsweise aus einem nicht rostenden DuplexStahlguss.The metallic hub part is preferably made of a rustproof duplex cast steel.

Die Aufgabe der Erfindung wird durch ein Verfahren zur Fertigung und Montage des erfindungsgemäßen Kreiselpumpenlaufrades gelöst und umfasst folgende Schritte:

  • Fertigung des nichtmetallischen Laufradteils, vorzugsweise mittels eines Gussverfahrens.
  • Einbringen von Vertiefungen in das Laufradteil, vorzugsweise durch Bohrungen entlang eines Umfangs an der wellenseitigen Stirnseite des Laufradteils.
  • Einfügen und Festlegen von Hülsen in den Vertiefungen, vorzugsweise durch Einpressen und/oder Einkleben der Hülsen in den Vertiefungen des Laufradteils.
  • Alternativ werden die Hülsen bei der Fertigung des nichtmetallischen Laufradteils mit eingegossen.
  • Einfügen des metallischen Nabenteiles in das nichtmetallische Laufradteil, wobei auf die Flucht von Bohrungen und Innengewinde der Hülsen zu achten ist.
  • Einfügen von Verbindungselementen in die Bohrungen entlang des Rings des Nabenteils und Einschrauben der Verbindungselemente in die Hülsen. Eine Schraubensicherung ist vorzusehen.
  • Aufschieben des vormontierten Kreiselpumpenlaufrades auf das Wellenende bis es am Ring des Nabenteils anschlägt.
  • Verspannung von Laufradteil und Nabenteil mittels einer Scheibe, die am Wellenende angeschraubt wird.
  • Befestigen der Kappe am montierten Kreiselpumpenlaufrad.
The object of the invention is achieved by a method for manufacturing and assembling the centrifugal pump impeller according to the invention and comprises the following steps:
  • Manufacture of the non-metallic impeller part, preferably by means of a casting process.
  • Introduction of depressions in the impeller part, preferably through bores along a circumference on the shaft-side end face of the impeller part.
  • Inserting and fixing sleeves in the depressions, preferably by pressing and / or gluing the sleeves in the depressions of the impeller part.
  • Alternatively, the sleeves are cast in during the manufacture of the non-metallic impeller part.
  • Insert the metallic hub part into the non-metallic impeller part, paying attention to the alignment of the holes and the internal thread of the sleeves.
  • Inserting connecting elements into the bores along the ring of the hub part and screwing the connecting elements into the sleeves. A screw lock must be provided.
  • Push the pre-assembled centrifugal pump impeller onto the shaft end until it strikes the ring of the hub part.
  • Bracing of the impeller part and hub part using a washer that is screwed onto the shaft end.
  • Attach the cap to the mounted centrifugal pump impeller.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der Beschreibung eines Ausführungsbeispiels anhand von Zeichnungen und aus den Zeichnungen selbst. Dabei zeigt:

Fig. 1
einen Axialschnitt durch das Gehäuse einer Kreiselpumpe mit darin angeordnetem Kreiselpumpenlaufrad,
Fig. 2
eine Explosionszeichnung des Kreiselpumpenlaufrads mit Welle,
Fig. 3
einen Axialschnitt durch das Kreiselpumpenlaufrad auf einem Wellenende.
Further features and advantages of the invention result from the description of an exemplary embodiment with reference to drawings and from the drawings themselves.
Fig. 1
an axial section through the housing of a centrifugal pump with a centrifugal pump impeller arranged therein,
Fig. 2
an exploded view of the centrifugal pump impeller with shaft,
Fig. 3
an axial section through the centrifugal pump impeller on a shaft end.

Fig. 1 zeigt ein Kreiselpumpenlaufrad 1, das in einem Gehäuse 2 einer Kreiselpumpe angeordnet ist. Das Gehäuse 2 umfasst eine Ansaugöffnung 3, durch den Fördermedium angesaugt wird und mittels des Kreiselpumpenlaufrads 1 in Richtung einer Ausströmöffnung 4 gefördert wird und dann die Kreiselpumpe verlässt. Fig. 1 shows a centrifugal pump impeller 1, which is arranged in a housing 2 of a centrifugal pump. The housing 2 comprises a suction opening 3, through the medium is sucked in and conveyed by means of the centrifugal pump impeller 1 in the direction of an outflow opening 4 and then leaves the centrifugal pump.

Das Kreiselpumpenlaufrad 1 ist auf einer Welle 5 angeordnet. Die Welle 5 wird von einem nicht dargestellten Motor in Rotation versetzt. Dabei wird das Drehmoment über zwei Passfedern 6 auf das metallische Nabenteil 8 und über die Mitnehmerelemente 12 auf den nichtmetallischen Laufradteil 7 des Kreiselpumpenlaufrades 1 übertragen.The centrifugal pump impeller 1 is arranged on a shaft 5. The shaft 5 is set in rotation by a motor, not shown. The torque is transmitted to the metallic hub part 8 via two feather keys 6 and to the non-metallic impeller part 7 of the centrifugal pump impeller 1 via the driver elements 12.

Das Kreiselpumpenlaufrad 1 besteht aus einem nichtmetallischen Laufradteil 7 und einem metallischen Nabenteil 8. Im Ausführungsbeispiel ist das nichtmetallische Laufradteil 7 aus einem Keramik-Kunststoff-Verbundmaterial gefertigt, bei dem Siliziumcarbidpartikel in einer Polymermatrix eingebettet sind.The centrifugal pump impeller 1 consists of a non-metallic impeller part 7 and a metallic hub part 8. In the exemplary embodiment, the non-metallic impeller part 7 is made of a ceramic-plastic composite material in which silicon carbide particles are embedded in a polymer matrix.

Das Nabenteil 8 ist aus einem nicht rostenden Duplexstahlguss gefertigt, das ein ferritisch-austenitisches Gefüge aufweist.The hub part 8 is made of a rust-free duplex cast steel, which has a ferritic-austenitic structure.

Das nichtmetallische Laufradteil 7 ist einstückig ausgeführt und wird im Gussverfahren hergestellt. Es weist eine Trägerplatte 9 auf, an der Schaufeln 10 angeformt sind. Im Ausführungsbeispiel handelt es sich um ein Radialkreiselpumpenlaufrad.The non-metallic impeller part 7 is made in one piece and is produced in the casting process. It has a carrier plate 9, on which blades 10 are molded. In the exemplary embodiment, it is a radial centrifugal pump impeller.

Fig. 2 zeigt eine perspektivische Explosionszeichnung des Kreiselpumpenlaufrads 1 mit dem Ende der Welle 5. Erfindungsgemäß weist das nichtmetallische Laufradteil 7 Vertiefungen 11 auf. Bei den Vertiefungen 11 handelt es sich um Bohrungen, die nach oder noch vor dem vollständigen Aushärten in das Laufradteil 7 eingebracht bzw. wenn sie bereits bei der Herstellung vorgegossen waren, dann fertigbearbeitet werden. Fig. 2 shows a perspective exploded view of the centrifugal pump impeller 1 with the end of the shaft 5. According to the invention, the non-metallic impeller part 7 has depressions 11. The depressions 11 are bores which are introduced into the impeller part 7 after or before they have completely hardened or are then finished if they were already pre-cast during manufacture.

Fig. 3 zeigt, dass im zusammengebauten Zustand in die Vertiefungen 11 Mitnehmerelemente 12 eingreifen. Jedes Mitnehmerelement 12 besteht aus einer Hülse 13 und einem Verbindungselement 14. Bei der Hülse 13 handelt es sich um einen hohlzylindrischen Körper, der an einer Stirnseite geschlossen ist. Jede Hülse 13 weist ein Innengewinde auf. Das Verbindungselement 14 ist als Schraube ausgeführt, die ein Außengewinde aufweist. Fig. 3 shows that engaging elements 12 engage in the recesses 11 in the assembled state. Each driver element 12 consists of a sleeve 13 and a connecting element 14. The sleeve 13 is a hollow cylindrical body which is closed on one end face. Each sleeve 13 has an internal thread. The connecting element 14 is designed as a screw which has an external thread.

Alternativ können die Hülsen 13 an der wellenseitigen Stirnseite des Laufradteils 7 eingegossen sein.Alternatively, the sleeves 13 can be cast in on the shaft-side end face of the impeller part 7.

Fig. 2 zeigt, dass das Nabenteil 8 einen Ring 15 aufweist, der entlang seines Umfangs mit mehreren Bohrungen 16 versehen ist. Fig. 2 shows that the hub part 8 has a ring 15 which is provided with a plurality of bores 16 along its circumference.

Bei der Montage des Kreiselpumpenlaufrads 1 auf der Welle wird dabei wie folgt vorgegangen:
Zunächst werden die Hülsen 13 in die Vertiefungen 11 eingeführt. Ein geeigneter Kleber bzw. Epoxidharz überbrückt Toleranzen und fixiert.When assembling the centrifugal pump impeller 1 on the shaft, proceed as follows:
First, the sleeves 13 are inserted into the depressions 11. A suitable adhesive or epoxy resin bridges tolerances and fixes them.

Dann wird das Nabenteil 8 in das Laufradteil 7 geschoben bis die Fläche 19 des Laufradteiles 7 am Ring 15 des Nabenteiles 8 anliegt. Auf die Flucht der Bohrung 16 und Innengewinde in den Hülsen 13 ist zu achten.Then the hub part 8 is pushed into the impeller part 7 until the surface 19 of the impeller part 7 abuts the ring 15 of the hub part 8. Make sure that the bore 16 and the internal thread in the sleeves 13 are aligned.

Dann werden die Verbindungselemente 14 in die Bohrungen 16 eingeführt und in die Hülsen 13, welche in den Vertiefungen 11 angeordnet sind, eingeschraubt und gesichert.Then the connecting elements 14 are inserted into the bores 16 and screwed into the sleeves 13, which are arranged in the recesses 11, and secured.

Zur weiteren Fixierung des Nabenteiles 8 mit dem Laufradteil 7 können noch Schrauben 20 in weitere dafür vorgesehene Gewindehülsen oder Gewindebohrungen 21 im nichtmetallischen Material des Laufradteils 7 eingeschraubt sein und beispielsweise als Transportsicherung oder Montagehilfe dienen, wenn die Hülsen 13 nicht in die Vertiefungen 11 eingepresst oder eingeklebt sind.For further fixation of the hub part 8 with the impeller part 7, screws 20 can also be screwed into additional threaded sleeves or threaded bores 21 provided in the non-metallic material of the impeller part 7 and serve, for example, as a transport lock or assembly aid if the sleeves 13 are not pressed or glued into the recesses 11 are.

Das vormontierte Kreiselpumpenlaufrad wird auf das Ende der Welle 5 aufgeschoben. Über die Passfedern 6 wird die Welle 5 drehfest mit dem Nabenteil 8 verbunden, wobei die Passfedern 6 in Nuten 17 des Nabenteils 8 eingreifen. Die Nuten 17 erstrecken sich in axialer Richtung im Innern des Nabenteils 8.The pre-assembled centrifugal pump impeller is pushed onto the end of shaft 5. The shaft 5 is connected in a rotationally fixed manner to the hub part 8 via the feather keys 6, the feather keys 6 engaging in grooves 17 of the hub part 8. The grooves 17 extend in the axial direction in the interior of the hub part 8.

Als nächstes wird eine Scheibe 23 mittels Schrauben 24 an der Stirnseite der Welle 5 befestigt. Dazu sind in der Scheibe 23 Bohrungen 25 eingebracht, durch die die Schrauben 24 gesteckt werden und dann in mit einem Innengewinde versehenen Bohrungen an der Stirnseite der Welle 5 greifen. Bei den Schrauben 24 handelt es sich um Zylinderschrauben. Durch das Anziehen der Schrauben 24 werden das Nabenteil 8 und das Laufradteil 7 gegeneinander verspannt.Next, a washer 23 is fastened to the end face of the shaft 5 by means of screws 24. For this purpose, bores 25 are made in the disk, through which the screws 24 are inserted and then engage in bores with an internal thread on the end face of the shaft 5. The screws 24 are cylinder screws. By tightening the screws 24, the hub part 8 and the impeller part 7 are braced against each other.

Schließlich wird die Kappe 26 in eine zentrische Bohrung 27, die mit einem Innengewinde versehen ist, eingeschraubt. Dazu weist die Kappe 26 einen Zapfen 28 auf, der mit einem Außengewinde versehen ist.Finally, the cap 26 is screwed into a central bore 27 which is provided with an internal thread. For this purpose, the cap 26 has a pin 28 which is provided with an external thread.

Fig. 3 zeigt, dass zwischen der Scheibe 23 und dem Laufradteil 7 ein Elastomerring 29 angeordnet sein kann. Durch Anziehen der Schrauben 24 wird gegen diesen Elastomerring 29 verspannt. Somit wird ein "Fließen" des nichtmetallischen Laufradteils 7 verhindert. Fig. 3 shows that an elastomer ring 29 can be arranged between the disk 23 and the impeller part 7. By tightening the screws 24, this elastomer ring 29 is braced. Thus, a "flow" of the non-metallic impeller part 7 is prevented.

In Fig. 3 erkennt man, dass zwischen der Kappe 26 und der Scheibe 23 ein O-Ring 30 angeordnet ist. Zwischen der Kappe 26 und dem Laufradteil 7 befindet sich ein O-Ring 31. Ebenso ist zwischen dem Ring 15 des Nabenteils 8 und der Fläche 19 des Laufradteils 7 ein O-Ring 32 angeordnet. Bezugszeichenliste 1 Kreiselpumpenlaufrad 30 O-Ring 2 Gehäuse 31 O-Ring 3 Ansaugöffnung 32 O-Ring 4 Ausströmöffnung 5 Welle 6 Passfeder 7 Laufradteil 8 Nabenteil 9 Trägerplatte 10 Schaufel 11 Vertiefungen 12 Mitnehmerelement 13 Hülse 14 Verbindungselement 15 Ring 16 Bohrungen mit Kegelansatz 17 Nut 18 Vorsprung 19 Fläche 20 Schrauben 21 Gewindebohrung 22 Senkansatz 23 Scheibe 24 Schrauben 25 Bohrungen 26 Kappe 27 Bohrung 28 Gewindezapfen 29 Elastomerring In Fig. 3 one can see that an O-ring 30 is arranged between the cap 26 and the disk 23. An O-ring 31 is located between the cap 26 and the impeller part 7. An O-ring 32 is also arranged between the ring 15 of the hub part 8 and the surface 19 of the impeller part 7. Reference list 1 Centrifugal pump impeller 30th O-ring 2nd casing 31 O-ring 3rd Suction opening 32 O-ring 4th Outflow opening 5 wave 6 Adjusting spring 7 Impeller part 8th Hub part 9 Carrier plate 10th shovel 11 Indentations 12th Driver element 13 Sleeve 14 Fastener 15 ring 16 Bores with a tapered shoulder 17th Groove 18th head Start 19th area 20th Screws 21 Tapped hole 22 Countersink 23 disc 24th Screws 25th Holes 26 cap 27 drilling 28 Threaded pin 29 Elastomer ring

Claims (8)

  1. Centrifugal pump impeller (1) having a non-metallic impeller part (7) and a metallic hub part (8) which is connected to the impeller part (7) and is disposed on a shaft (5), wherein a releasable connection exists between impeller part (7) and hub part (8), wherein impeller part (7) and hub part (8) are releasably connected to each other via driver elements (12)
    characterized in that
    the driver elements (12) respectively have a sleeve (13) and a connecting element (14) and the sleeves (13) are disposed in pockets (11) on an end face of the impeller part (7).
  2. Centrifugal pump impeller (1) according to Claim 1, characterized in that the sleeves (13) are cast in place on an end face of the impeller part (7).
  3. Centrifugal pump impeller (1) according to one of Claim 1 and 2, characterized in that the connecting elements (14) are disposed on a ring (15) of the hub part (8) and engage at least partially in the sleeves (13).
  4. Centrifugal pump impeller (1) according to one of Claims 1 to 3, characterized in that the hub part (8) has a projection (18), which projects into the impeller part (7).
  5. Centrifugal pump impeller (1) according to Claim 3 or 4, characterized in that the ring (15) of the hub part (8) bears against an end-side face (19) of the impeller part (7).
  6. Method for producing a centrifugal pump impeller (1) according to one of Claims 1 to 5 , having the following steps:
    production of the non-metallic impeller part (7), preferably by means of a casting process,
    making of pockets (11) in the impeller part (7) along a periphery on the shaft-side end face of the impeller part (7),
    insertion and securement of sleeves (13) in the pockets (11), or casting of sleeves (13) in place in the production of the non-metallic impeller part (7),
    insertion of the metallic hub part (8) in the non-metallic impeller part (7),
    insertion of connecting elements (14) in the bores along a ring (15) of the hub part (8) and bolting of the connecting elements (14) into the sleeves (13),
    slipping of the preassembled centrifugal pump impeller (1) onto the shaft end.
  7. Method according to Claim 6, characterized in that the impeller part (7) and hub part (8) are clamped together by means of a disc (23) which is bolted onto the shaft end.
  8. Method according to one of Claims 6 or 7, characterized in that a cap (26) is fastened on the mounted centrifugal pump impeller (1).
EP15813022.9A 2014-12-19 2015-12-15 Centrifugal pump impeller Active EP3234371B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014226525.8A DE102014226525A1 (en) 2014-12-19 2014-12-19 The centrifugal pump impeller
PCT/EP2015/079729 WO2016096808A1 (en) 2014-12-19 2015-12-15 Centrifugal pump impeller

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Publication Number Publication Date
EP3234371A1 EP3234371A1 (en) 2017-10-25
EP3234371B1 true EP3234371B1 (en) 2020-05-06

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EP15813022.9A Active EP3234371B1 (en) 2014-12-19 2015-12-15 Centrifugal pump impeller

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EP (1) EP3234371B1 (en)
CN (2) CN114738313A (en)
DE (1) DE102014226525A1 (en)
WO (1) WO2016096808A1 (en)
ZA (1) ZA201704112B (en)

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Publication number Priority date Publication date Assignee Title
DE102018214650A1 (en) * 2018-08-29 2020-03-05 KSB SE & Co. KGaA Flow guiding device
CN109296562A (en) * 2018-09-05 2019-02-01 嘉兴美斯克电气科技有限公司 A kind of super bath wind wheel fixed structure
DE102021118384A1 (en) 2021-07-15 2023-01-19 KSB SE & Co. KGaA Lightweight hydraulic design for improved 3D printability
DE102021005121A1 (en) 2021-10-13 2023-04-13 KSB SE & Co. KGaA Impeller with teeth in the cover plate

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD18758A (en)
DE895250C (en) * 1944-01-08 1953-11-02 Porzellanfabrik Kahla Ceramic impeller for centrifugal pumps u. like
GB1386937A (en) 1972-04-17 1975-03-12 Mecanique Ind Int Impellers of pumps for cooling systems of internal combustion engines
DE7610913U1 (en) 1976-04-08 1976-08-19 Wilo-Werk Gmbh & Co -Pumpen- Und Apparatebau-, 4600 Dortmund Centrifugal pump
DE4444965A1 (en) 1994-12-16 1996-06-20 Klein Schanzlin & Becker Ag Impeller attachment
JP2005291116A (en) * 2004-03-31 2005-10-20 Yamada Seisakusho Co Ltd Impeller for water pump
CN200958487Y (en) * 2006-09-01 2007-10-10 湖南天一科技股份有限公司 Impeller positioning mechanism of multi-stage pump
WO2013000032A1 (en) * 2011-06-30 2013-01-03 Weir Minerals (India) Private Limited Improved ceramic impeller with metallic hub
CN203035597U (en) * 2012-11-16 2013-07-03 苏州海涛化工钛设备有限公司 Impeller hub device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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ZA201704112B (en) 2022-03-30
CN107250551A (en) 2017-10-13
CN114738313A (en) 2022-07-12
WO2016096808A1 (en) 2016-06-23
EP3234371A1 (en) 2017-10-25
DE102014226525A1 (en) 2016-06-23

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