EP1193397A2 - Plastic housing with metal suds - Google Patents

Plastic housing with metal suds Download PDF

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Publication number
EP1193397A2
EP1193397A2 EP01119802A EP01119802A EP1193397A2 EP 1193397 A2 EP1193397 A2 EP 1193397A2 EP 01119802 A EP01119802 A EP 01119802A EP 01119802 A EP01119802 A EP 01119802A EP 1193397 A2 EP1193397 A2 EP 1193397A2
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EP
European Patent Office
Prior art keywords
centrifugal pump
pump according
plastic
pipeline
connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01119802A
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German (de)
French (fr)
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EP1193397A3 (en
EP1193397B1 (en
Inventor
Michael Ranft
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo SE
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Wilo GmbH
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Filing date
Publication date
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Publication of EP1193397A2 publication Critical patent/EP1193397A2/en
Publication of EP1193397A3 publication Critical patent/EP1193397A3/en
Application granted granted Critical
Publication of EP1193397B1 publication Critical patent/EP1193397B1/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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid 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
    • F04D29/4293—Details of fluid inlet or outlet
    • 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
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the present invention relates to an electrically operated pump, in particular a centrifugal pump for conveying a liquid medium in a system of Pipes, a motor housing surrounding the electric motor and a Has plastic-made pump housing, which has an inlet port and a pump housing having an outlet connection, the impeller receiving impeller chamber covered on the face.
  • Centrifugal pumps with plastic pump housings are well known.
  • a disadvantage of the known pump types is that when connecting the Piping to the nozzle problems with the molded plastic Threads occur, especially with large pressure loads or at improper handling can quickly be affected and can even be destroyed. Damaged threads impair the function the pump and lead to leaks at the connections.
  • Such pumps with a plastic pump housing can therefore only be used to a limited extent are used and are for applications in the process water circuit of Buildings where pressure peaks of up to 30 bar can occur are not very suitable.
  • the use in heating circuits is also due to possible leaks given security risks for the buildings only possible to a limited extent.
  • the object of the present invention is now one for use under harsh conditions to create suitable centrifugal pump that is inexpensive and is also very resistant to simple production has high pressures and pressure peaks.
  • the basic idea of the invention is that at least one of the nozzles, namely the one acted upon by high pressures, with a connector
  • the connector made of metal forms an adequate counterpart for the metallic connection of the Pipeline, so that a safe and stable connection is possible. It is advantageous depending on the application and the type of piping system to use other metal.
  • a connector can be used for conventional purposes be made of brass, which is simple and inexpensive to manufacture. To prevent corrosion and metal pitting, the metal used should, however correspond to that of the pipeline.
  • the connector can either be cast part, or by turning from a blank be worked out.
  • the invention thus ideally combines the advantages which the plastic housing in terms of manufacture, manufacturing costs, Weight and durability and the metal case in terms of stability its connection piece offers.
  • the connector is advantageous for the connector to be designed in such a way that it surrounds the plastic-molded nozzle Has connecting sleeve.
  • the invention offers Pump housing in this respect the same connection options as a housing that is made entirely of metal than the one surrounding the nozzle Connection sleeve any connection standard can be realized.
  • the connecting sleeve has a particularly simple and thus advantageous shape External thread on which the pipeline is attached by means of a union nut can be screwed on.
  • This connection standard is for those under discussion Pumps are known and widely used, making existing pumps easy can be replaced by the invention.
  • the connector sleeve is removable on the connector attached so that only the sleeve to adjust the connection standard needs to be replaced.
  • a particularly stable connection between the plastic housing and to ensure the connector according to the invention it is advantageous to at least partially overmold it with the plastic of the nozzle or to be enclosed in plastic.
  • the connector from involved in the manufacture of the housing from the start and inseparable from the Housing connected.
  • the plastic lies close to the Surface of the metal and connects to it. This creates a stable one and tight connection between the two materials.
  • the surface of the connecting piece has formations or recesses, the interlocking of both parts by positive locking to the plastic housing in Ensure axial direction and in the direction of rotation.
  • Such a toothed connection is advantageously provided by a retaining ring realized on the back facing away from the pipeline to be connected the connecting sleeve is formed coaxially and with the connecting sleeve over Connecting webs is connected.
  • the retaining ring which is preferred in one Embodiment has the same inner diameter as the connecting sleeve, made possible by the suspension formed on the webs Interruptions an intervention of the molded plastic nozzle in the Contours of the connector. So the form fit of the connector on Nozzles guaranteed in the axial direction and in the direction of rotation.
  • the connecting webs be provided with radially outwardly directed edges or teeth, which in engage the plastic enclosing the connector.
  • the connector has four such webs, which with their outer contour Form corners of a square and the inner contour of the through hole of the Form the connector.
  • the one to be connected Pipe facing end face of the connector or the connector sleeve for sealing against the pipe socket from a thin layer covered in plastic.
  • This support formed by the material of the nozzle in the kind of a collar covers the front sealing surface of the metal sleeve like one Sealing washer.
  • the collar offers the attachment a system that prevents the connector from slipping off the nozzle in the axial direction.
  • Plastic housing can be used for any type of pump it advantageously used in centrifugal pumps. It is particularly too prefer if both the pressure port and the suction port of the pump have a connector made of metal. So is the highest possible stability guaranteed.
  • the use of the invention in pumps is particularly advantageous, whose pressure port is arranged coaxially "in-line" with the suction port.
  • In-line pumps offer a wide range of applications and are used as pumps for Heating or domestic water systems of particular importance. Since both Sockets have the same connection standard, both sockets can be identical Connectors are equipped.
  • a particularly high stability of the housing is achieved if that Pump housing a one-piece injection molded part with only a single central Injection point is.
  • Such housings that ideally have no weld lines inside of the plastic are particularly suitable for the use of Centrifugal pump for pumping industrial water in supply systems from Buildings where pressure peaks of up to 30 bar occur.
  • the nozzle 1 is an electrically operated, not shown Centrifugal pump shown, which is molded onto a plastic pump housing.
  • the nozzle 1 is surrounded by a connector 2 made of metal, to the an external thread 3 a pipe, not shown, by means of a union nut can be connected.
  • the pipeline is on the front side 4 of the Attachment 2 placed, which to seal against the pipeline of a projection 5 of the plastic connector is covered.
  • the connector 2 is partially surrounded by the plastic of the nozzle.
  • connection piece 2 has the connection piece surrounding connection sleeve 6, into which the external thread 3 is introduced.
  • connection sleeve 6 On the back of the connecting sleeve facing away from the pipeline to be connected 6 is a retaining ring 7 coaxially formed, which with the connecting sleeve 6 over Connecting webs 8 is connected. Between the connecting sleeve 6 and the Retaining ring 7 thus remain recesses 9 into which the plastic of the nozzle 1 can flow.
  • the retaining ring and the connection sleeve the same inside diameter.
  • the connecting webs 8 carry radially outwards directed edges 10, which in the connector 2 enclosing plastic intervention.
  • the connector with the attached connector designed so that the connector made of metal nowhere to the medium is exposed to what is particularly aggressive when using the pump to pump Chemicals is beneficial. Nevertheless, the high stability of a metallic Given connector.

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

Abstract

The pump housing which is made from plastics has an inlet pipe and outlet pipe and covers a pump chamber at the end. At least one of the pipes has a metal connector (2) so that it can be connected onto a pipeline. The connector has a connecting sleeve (6) which fits round the plastics pipe of the housing. The sleeve can have external thread so that the pipe line can be screwed onto same.

Description

Die vorliegende Erfindung betrifft eine elektrisch betriebene Pumpe, insbesondere eine Kreiselpumpe zur Förderung eines flüssigen Mediums in einem System von Rohrleitungen, die ein den Elektromotor umgebendes Motorgehäuse und ein aus Kunststoff gefertigtes Pumpengehäuse aufweist, wobei das einen Einlaßstutzen und einen Auslaßstutzen aufweisende Pumpengehäuse eine das Laufrad aufnehmende Laufradkammer stirnseitig bedeckt.The present invention relates to an electrically operated pump, in particular a centrifugal pump for conveying a liquid medium in a system of Pipes, a motor housing surrounding the electric motor and a Has plastic-made pump housing, which has an inlet port and a pump housing having an outlet connection, the impeller receiving impeller chamber covered on the face.

Kreiselpumpen mit Pumpengehäusen aus Kunststoff sind hinlänglich bekannt. Nachteilig an den bekannten Pumpentypen ist jedoch, daß beim Anschluß der Rohrleitungen an die Stutzen Probleme mit den aus Kunststoff geformten Gewinden auftreten, die insbesondere bei großen Druckbelastungen oder bei unsachgemäßer Handhabung schnell in Mitleidenschaft gezogen werden und sogar zerstört werden können. Beschädigte Gewinde beeinträchtigen die Funktion der Pumpe und führen zu Leckagen an den Anschlüssen. Derartige Pumpen mit einem Pumpengehäuse aus Kunststoff können daher nur eingeschränkt eingesetzt werden und sind für Anwendungen im Brauchwasserkreislauf von Gebäuden, wo Druckspitzen von bis zu 30 bar auftreten können, wenig geeignet. Auch der Einsatz in Heizkreisläufen ist wegen der durch eventuelle Leckagen gegebenen Sicherheitsrisiken für die Gebäude nur bedingt möglich. Centrifugal pumps with plastic pump housings are well known. A disadvantage of the known pump types, however, is that when connecting the Piping to the nozzle problems with the molded plastic Threads occur, especially with large pressure loads or at improper handling can quickly be affected and can even be destroyed. Damaged threads impair the function the pump and lead to leaks at the connections. Such pumps with a plastic pump housing can therefore only be used to a limited extent are used and are for applications in the process water circuit of Buildings where pressure peaks of up to 30 bar can occur are not very suitable. The use in heating circuits is also due to possible leaks given security risks for the buildings only possible to a limited extent.

Zwar sind Pumpen bekannt, deren Stutzen durch aufgesteckte Metallringe verstärkt sind. Diese Pumpen haben jedoch den Nachteil, daß der Metallring nur ein Innengewinde umgeben kann, während die Anschlußnorm bei Anwendungen in Heiz- und Brauchwasserkreisläufen meist ein Außengewinde voraussetzt.Pumps are known, the sockets of which are attached by metal rings are reinforced. However, these pumps have the disadvantage that the metal ring only an internal thread can surround while the connection standard in applications usually requires an external thread in heating and process water circuits.

Aufgabe der vorliegenden Erfindung ist es nunmehr, eine auch für den Einsatz unter harten Bedingungen geeignete Kreiselpumpe zu schaffen, die kostengünstig ist und zudem bei einfacher Fertigung eine große Widerstandsfähigkeit gegenüber hohen Drücken und Druckspitzen aufweist.The object of the present invention is now one for use under harsh conditions to create suitable centrifugal pump that is inexpensive and is also very resistant to simple production has high pressures and pressure peaks.

Diese Aufgabe wird durch eine Kreiselpumpe nach Anspruch 1 gelöst.This object is achieved by a centrifugal pump according to claim 1.

Der Grundgedanke der Erfindung liegt darin, mindestens einen der Stutzen, nämlich den von hohen Drücken beaufschlagten, mit einem Anschlußstück aus Metall zu versehen, an das eine Rohrleitung anschließbar ist. Das Anschlußstück aus Metall bildet ein adäquates Gegenstück für den metallischen Anschluß der Rohrleitung, so daß eine sichere und stabile Verbindung möglich ist. Dabei ist es vorteilhaft, je nach Anwendung und nach Art des Rohrleitungssystemes ein anderes Metall zu verwenden. Für herkömmliche Zwecke kann ein Anschlußstück aus Messing vorgesehen sein, das einfach und kostengünstig in der Fertigung ist. Um Korrosion und Metallfraß zu verhindern, sollte das verwendete Metall jedoch dem der Rohrleitung entsprechen. Das Anschlußstück kann dabei entweder als gegossenes Teil hergestellt werden, oder durch Drehen aus einem Rohling herausgearbeitet sein. Die Erfindung vereint somit auf ideale Weise die Vorteile, die das Kunststoffgehäuse hinsichtlich der Fertigung, der Herstellungskosten, des Gewichtes und der Haltbarkeit und das Metallgehäuse hinsichtlich der Stabilität seiner Anschlußstutzen bietet.The basic idea of the invention is that at least one of the nozzles, namely the one acted upon by high pressures, with a connector To provide metal to which a pipe can be connected. The connector made of metal forms an adequate counterpart for the metallic connection of the Pipeline, so that a safe and stable connection is possible. It is advantageous depending on the application and the type of piping system to use other metal. A connector can be used for conventional purposes be made of brass, which is simple and inexpensive to manufacture. To prevent corrosion and metal pitting, the metal used should, however correspond to that of the pipeline. The connector can either be cast part, or by turning from a blank be worked out. The invention thus ideally combines the advantages which the plastic housing in terms of manufacture, manufacturing costs, Weight and durability and the metal case in terms of stability its connection piece offers.

Im Hinblick auf eine besonders hohe Stabilität ist es vorteilhaft, das Anschlußstück so auszubilden, daß es eine den aus Kunststoff geformten Stutzen umgebende Anschlußhülse aufweist. Mit dieser Anschlußhüise bietet das erfindungsgemäße Pumpengehäuse insofern dieselben Anschlußmöglichkeiten wie ein Gehäuse, das komplett aus Metall gefertigt ist, als mit der den Stutzen umgebenden Anschlußhülse jede beliebige Anschlußnorm realisiert werden kann. In einer besonders einfachen und damit vorteilhaften Form weist die Anschlußhülse ein Außengewinde auf, auf das die Rohrleitung vermittels einer Überwurfmutter aufschraubbar ist. Diese Anschlußnorm ist bei den zur Debatte stehenden Pumpen bekannt und wird häufig verwendet, so daß vorhandene Pumpen einfach durch die erfindungsgemäßen ersetzt werden können. In einer besonderen Ausführungsform ist die Anschlußhülse abnehmbar am Anschlußstück angebracht, so daß zur Anpassung der Anschlußnorm lediglich die Hülse ausgetauscht werden braucht.In view of a particularly high stability, it is advantageous for the connector to be designed in such a way that it surrounds the plastic-molded nozzle Has connecting sleeve. With this connection sleeve, the invention offers Pump housing in this respect the same connection options as a housing that is made entirely of metal than the one surrounding the nozzle Connection sleeve any connection standard can be realized. In a the connecting sleeve has a particularly simple and thus advantageous shape External thread on which the pipeline is attached by means of a union nut can be screwed on. This connection standard is for those under discussion Pumps are known and widely used, making existing pumps easy can be replaced by the invention. In a special one Embodiment, the connector sleeve is removable on the connector attached so that only the sleeve to adjust the connection standard needs to be replaced.

Um eine besonders stabile Verbindung zwischen dem Gehäuse aus Kunststoff und dem erfindungsgemäßen Anschlußstück zu gewährleisten, ist es vorteilhaft, dieses zumindest teilweise mit dem Kunststoff des Stutzens zu umspritzen bzw. im Kunststoff einzufassen. Um dies zu realisieren wird das Anschlußstück von vornherein in die Fertigung des Gehäuses einbezogen und unlösbar mit dem Gehäuse verbunden. Beim Spritzen legt sich der Kunststoff dicht an die Oberfläche des Metalls an und verbindet sich mit dieser. So entsteht eine stabile und dichte Verbindung zwischen beiden Materialien. Dabei ist es vorteilhaft, wenn die Oberfläche des Anschlußstückes Anformungen oder Ausnehmungen aufweist, die eine Verzahnung beider Teile durch Formschluß zum Kunststoffgehäuse in axialer Richtung und in Drehrichtung gewährleisten.A particularly stable connection between the plastic housing and to ensure the connector according to the invention, it is advantageous to at least partially overmold it with the plastic of the nozzle or to be enclosed in plastic. To achieve this, the connector from involved in the manufacture of the housing from the start and inseparable from the Housing connected. When spraying, the plastic lies close to the Surface of the metal and connects to it. This creates a stable one and tight connection between the two materials. It is advantageous if the surface of the connecting piece has formations or recesses, the interlocking of both parts by positive locking to the plastic housing in Ensure axial direction and in the direction of rotation.

Eine solche verzahnte Verbindung wird vorteilhafterweise durch einen Haltering realisiert, der an die der anzuschließenden Rohrleitung abgewandten Rückseite der Anschlußhülse koaxial angeformt ist und der mit der Anschlußhülse über Verbindungsstege verbunden ist. Der Haltering, der in einer zu bevorzugenden Ausführungsform denselben Innendurchmesser wie die Anschlußhülse aufweist, ermöglicht wegen der durch seine Aufhängung an den Stegen gebildeten Unterbrechungen ein Eingreifen des aus Kunststoff gespritzten Stutzens in die Konturen des Anschlußstückes. So ist der Formschluß des Anschlußstückes am Stutzen in axialer Richtung und in Drehrichtung gewährleistet.Such a toothed connection is advantageously provided by a retaining ring realized on the back facing away from the pipeline to be connected the connecting sleeve is formed coaxially and with the connecting sleeve over Connecting webs is connected. The retaining ring, which is preferred in one Embodiment has the same inner diameter as the connecting sleeve, made possible by the suspension formed on the webs Interruptions an intervention of the molded plastic nozzle in the Contours of the connector. So the form fit of the connector on Nozzles guaranteed in the axial direction and in the direction of rotation.

Um den Formschluß zu verbessern, ist es vorteilhaft, wenn die Verbindungsstege mit radial nach Außen gerichteten Kanten oder Zähnen versehen werden, die in den das Anschlußstück einfassenden Kunststoff eingreifen. Im einfachsten Falle weist das Anschlußstück vier derartige Stege auf, die mit ihrer Außenkontur die Ecken eines Quadrates bilden und deren Innenkontur die Durchgangsbohrung des Anschlußstückes bilden.To improve the positive connection, it is advantageous if the connecting webs be provided with radially outwardly directed edges or teeth, which in engage the plastic enclosing the connector. In the simplest case the connector has four such webs, which with their outer contour Form corners of a square and the inner contour of the through hole of the Form the connector.

In einer besonders vorteilhaften Ausführungsform ist die der anzuschließenden Rohrleitung zugewandte Stirnseite des Anschlußstückes oder der Anschlußhülse zur Abdichtung gegenüber dem Stutzen der Rohrleitung von einer dünnen Auflage aus Kunststoff bedeckt. Diese vom Material des Stutzens gebildete Auflage in der Art eines Kragens bedeckt die stirnseitige Dichtfläche der Metallhülse wie eine Dichtscheibe. Gleichzeitig bietet der Kragen dem Anschlußstück eine Anlage, die ein Abrutschen des Anschlußstückes vom Stutzen in axialer Richtung verhindert.In a particularly advantageous embodiment, the one to be connected Pipe facing end face of the connector or the connector sleeve for sealing against the pipe socket from a thin layer covered in plastic. This support formed by the material of the nozzle in the Kind of a collar covers the front sealing surface of the metal sleeve like one Sealing washer. At the same time, the collar offers the attachment a system that prevents the connector from slipping off the nozzle in the axial direction.

Auch wenn das mit den erfindungsgemäßen Anschlußstücken versehene Kunststoffgehäuse für beliebige Arten von Pumpen eingesetzt werden kann, findet es vorteilhafterweise bei Kreiselpumpen Verwendung. Dabei ist es besonders zu bevorzugen, wenn sowohl der Druckstutzen als auch der Saugstutzen der Pumpe ein Anschlußstück aus Metall aufweisen. So wird die höchst mögliche Stabilität gewährleistet. Besonders vorteilhaft ist der Einsatz der Erfindung bei Pumpen, deren Druckstutzen koaxial "in-line" mit dem Saugstutzen angeordnet ist. Solche In-line-Pumpen bieten vielfältige Einsatzmöglichkeiten und sind als Pumpen für Heizungs- oder Brauchwassersysteme von besonderer Bedeutung. Da beide Stutzen dieselbe Anschlußnorm aufweisen, können beide Stutzen mit baugleichen Anschlußstücken ausgestattet werden.Even if that provided with the connectors according to the invention Plastic housing can be used for any type of pump it advantageously used in centrifugal pumps. It is particularly too prefer if both the pressure port and the suction port of the pump have a connector made of metal. So is the highest possible stability guaranteed. The use of the invention in pumps is particularly advantageous, whose pressure port is arranged coaxially "in-line" with the suction port. Such In-line pumps offer a wide range of applications and are used as pumps for Heating or domestic water systems of particular importance. Since both Sockets have the same connection standard, both sockets can be identical Connectors are equipped.

Eine besonders hohe Stabilität des Gehäuses wird erreicht, wenn das Pumpengehäuse ein einstückiges Spritzgießteil mit nur einem einzigen zentralen Anspritzpunkt ist. Solche Gehäuse, die idealerweise keine Bindenähte innerhalb des Kunststoffes aufweisen sind besonders geeignet für die Verwendung der Kreiselpumpe zur Förderung von Brauchwasser in Versorgungssystemen von Gebäuden, wo Druckspitzen von bis zu 30 bar auftreten. A particularly high stability of the housing is achieved if that Pump housing a one-piece injection molded part with only a single central Injection point is. Such housings that ideally have no weld lines inside of the plastic are particularly suitable for the use of Centrifugal pump for pumping industrial water in supply systems from Buildings where pressure peaks of up to 30 bar occur.

Eine besondere Ausführungsform der Erfindung ist in den Figuren 1 und 2 dargestellt und wird im folgenden näher beschrieben. Es zeigen:

Figur 1
einen Stutzen mit Anschlußstück und
Figur 2
ein Anschlußstück in perspektivischer Ansicht,
A special embodiment of the invention is shown in Figures 1 and 2 and is described in more detail below. Show it:
Figure 1
a nozzle with connector and
Figure 2
a connector in perspective view,

In Figur 1 ist der Stutzen 1 einer nicht dargestellten elektrisch betriebenen Kreiselpumpe gezeigt, der an ein Pumpengehäuse aus Kunststoff angeformt ist. Der Stutzen 1 ist von einem Anschlußstück 2 aus Metall umgeben, an das über ein Außengewinde 3 eine nicht dargestellte Rohrleitung mittels einer Überwurfmutter anschließbar ist. Die Rohrleitung wird dabei auf die Stirnseite 4 des Anschlußstückes 2 aufgesetzt, die zur Abdichtung gegenüber der Rohrleitung von einer Auskragung 5 des Kunststoffstutzens bedeckt ist. In der vorliegenden Form ist das Anschlußstück 2 teilweise vom Kunststoff des Stutzens eingefaßt.In Figure 1, the nozzle 1 is an electrically operated, not shown Centrifugal pump shown, which is molded onto a plastic pump housing. The nozzle 1 is surrounded by a connector 2 made of metal, to the an external thread 3 a pipe, not shown, by means of a union nut can be connected. The pipeline is on the front side 4 of the Attachment 2 placed, which to seal against the pipeline of a projection 5 of the plastic connector is covered. As it stands the connector 2 is partially surrounded by the plastic of the nozzle.

Wie auch in Figur 2 zu erkennen ist, weist das Anschlußstück 2 eine den Stutzen umgebende Anschlußhülse 6 auf, in die das Außengewinde 3 eingebracht ist. An die der anzuschließenden Rohrleitung abgewandten Rückseite der Anschlußhülse 6 ist ein Haltering 7 koaxial angeformt, der mit der Anschlußhülse 6 über Verbindungsstege 8 verbunden ist. Zwischen der Anschlußhülse6 und dem Haltering 7 verbleiben somit Ausnehmungen 9, in die der Kunststoff des Stutzens 1 einfließen kann. In diesem Beispiel haben der Haltering und die Anschlußhülse denselben Innendurchmesser. Die Verbindungsstege 8 tragen radial nach Außen gerichtete Kanten 10, die in den das Anschlußstück 2 einfassenden Kunststoff eingreifen.As can also be seen in FIG. 2, the connection piece 2 has the connection piece surrounding connection sleeve 6, into which the external thread 3 is introduced. On the back of the connecting sleeve facing away from the pipeline to be connected 6 is a retaining ring 7 coaxially formed, which with the connecting sleeve 6 over Connecting webs 8 is connected. Between the connecting sleeve 6 and the Retaining ring 7 thus remain recesses 9 into which the plastic of the nozzle 1 can flow. In this example, the retaining ring and the connection sleeve the same inside diameter. The connecting webs 8 carry radially outwards directed edges 10, which in the connector 2 enclosing plastic intervention.

In dem vorliegenden Beispiel ist der Stutzen mit dem aufgesetzten Anschlußstück so gestaltet, daß das Anschlußstück aus Metall an keiner Stelle dem Medium ausgesetzt ist, was gerade beim Einsatz der Pumpe zur Förderung aggressiver Chemikalien vorteilhaft ist. Dennoch ist die hohe Stabilität eines metallischen Anschlußstückes gegeben.In the present example, the connector with the attached connector designed so that the connector made of metal nowhere to the medium is exposed to what is particularly aggressive when using the pump to pump Chemicals is beneficial. Nevertheless, the high stability of a metallic Given connector.

Claims (12)

Elektrisch betriebene Pumpe, insbesondere Kreiselpumpe, zur Förderung eines flüssigen Mediums in einem System von Rohrleitungen mit einem den Elektromotor umgebenden Motorgehäuse und mit einem aus Kunststoff gefertigten Pumpengehäuse, wobei das einen Einlaßstutzen und einen Auslaßstutzen aufweisende Pumpengehäuse eine Pumpenkammer, insbesondere eine das Laufrad aufnehmende Laufradkammer, stirnseitig bedeckt,
dadurch gekennzeichnet, daß mindestens einer der Stutzen (1) ein Anschlußstück (2) aus Metall aufweist, an das eine Rohrleitung anschließbar ist.Electrically operated pump, in particular a centrifugal pump, for conveying a liquid medium in a system of pipelines with a motor housing surrounding the electric motor and with a pump housing made of plastic, the pump housing having an inlet connection and an outlet connection comprising a pump chamber, in particular an impeller chamber accommodating the impeller, covered on the face,
characterized in that at least one of the connecting pieces (1) has a connecting piece (2) made of metal, to which a pipeline can be connected. Kreiselpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß das Anschlußstück (2) eine Anschlußhülse (6) aufweist, die den aus Kunststoff geformten Stutzen (1) umgibt.Centrifugal pump according to claim 1,
characterized in that the connecting piece (2) has a connecting sleeve (6) which surrounds the socket (1) formed from plastic. Kreiselpumpe nach Anspruch 2,
dadurch gekennzeichnet, daß die Anschlußhülse (6) ein Außengewinde (3) aufweist, auf das die Rohrleitung vermittels einer Überwurfmutter aufschraubbar ist.Centrifugal pump according to claim 2,
characterized in that the connecting sleeve (6) has an external thread (3) onto which the pipeline can be screwed by means of a union nut. Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß das Anschlußstück (2) zumindest teilweise vom Kunststoff des Stutzens (1) umspritzt und/oder eingefaßt ist.Centrifugal pump according to one of the preceding claims,
characterized in that the connector (2) is at least partially encapsulated and / or bordered by the plastic of the connector (1). Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß an die der anzuschließenden Rohrleitung abgewandten Rückseite der Anschlußhülse (6) ein Haltering (7) koaxial angeformt ist, wobei der Haltering (7) und die Anschlußhülse (6) über Verbindungsstege (10) verbunden sind. Centrifugal pump according to one of the preceding claims,
characterized in that a retaining ring (7) is coaxially formed on the rear side of the connecting sleeve (6) facing away from the pipeline, the retaining ring (7) and the connecting sleeve (6) being connected via connecting webs (10). Kreiselpumpe nach Anspruch 5,
dadurch gekennzeichnet, daß der Haltering (7) und die Anschlußhülse (6) denselben Innendurchmesser aufweisen.Centrifugal pump according to claim 5,
characterized in that the retaining ring (7) and the connecting sleeve (6) have the same inner diameter. Kreiselpumpe nach Anspruch 5 oder 6,
dadurch gekennzeichnet, daß die Verbindungsstege (10) radial nach Außen gerichtete Kanten oder Zähne aufweisen, die in den das Anschlußstück (2) einfassenden Kunststoff eingreifen.Centrifugal pump according to claim 5 or 6,
characterized in that the connecting webs (10) have radially outwardly directed edges or teeth which engage in the plastic surrounding the connecting piece (2). Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß die der anzuschließenden Rohrleitung zugewandten Stirnseite (4) des Anschlusstückes (2) zur Dichtung gegenüber dem Stutzen der Rohrleitung vom Kunststoff des Stutzens (5) bedeckt ist.Centrifugal pump according to one of the preceding claims,
characterized in that the end face (4) of the connecting piece (2) facing the pipeline to be connected is covered by the plastic of the connecting piece (5) for sealing against the connecting piece of the pipeline. Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß sowohl der Druckstutzen als auch der Saugstutzen jeweils ein Anschlußstück (2) aus Metall aufweisen.Centrifugal pump according to one of the preceding claims,
characterized in that both the pressure port and the suction port each have a connecting piece (2) made of metal. Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß der Druckstutzen und der Saugstutzen koaxial "in-line" angeordnet sind.Centrifugal pump according to one of the preceding claims,
characterized in that the pressure port and the suction port are arranged coaxially "in-line". Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß das Pumpengehäuse ein Spritzgießteil mit einem einzigen Anspritzpunkt ist.Centrifugal pump according to one of the preceding claims,
characterized in that the pump housing is an injection molded part with a single injection point. Verwendung der Kreiselpumpe nach einem der vorherigen Ansprüche zur Förderung von Brauchwasser in Versorgungssystemen von Gebäuden.Use of the centrifugal pump according to one of the preceding claims Promotion of process water in building supply systems.
EP01119802A 2000-09-29 2001-08-16 Plastic housing with metal suds Expired - Lifetime EP1193397B1 (en)

Applications Claiming Priority (2)

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DE10048758 2000-09-29
DE10048758A DE10048758A1 (en) 2000-09-29 2000-09-29 Plastic housing with metal socket

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EP1193397A3 EP1193397A3 (en) 2002-09-04
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WO2021042720A1 (en) 2019-09-02 2021-03-11 中山大洋电机股份有限公司 Adaptor for induced draft fan, and induced draft fan and draft fan system using same

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US2850064A (en) * 1954-08-27 1958-09-02 Illinois Tool Works Nut structure having elastic gripping action and sealing means
US3614137A (en) * 1970-04-09 1971-10-19 Perfection Corp Reinforced plastic fitting
US4146059A (en) * 1976-07-16 1979-03-27 J. Lorch Gesselschaft & Co. Kg Plastic member having a reinforcing element at the mouth of a flow aperture thereof
DE3011888A1 (en) * 1980-03-27 1981-10-01 Richard 7066 Baltmannsweiler Halm In line mounting centrifugal pump - has insert in casing with suction channel coupled to suction opening and to impeller
GB2194833A (en) * 1986-07-15 1988-03-16 Automotive Products Plc Hydraulic cylinder structure
EP0919727A1 (en) * 1997-11-28 1999-06-02 WILO GmbH Centrifugal motorpump

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* Cited by examiner, † Cited by third party
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DE19734128C5 (en) * 1997-08-07 2004-09-23 Conti Temic Microelectronic Gmbh Plastic housing with a metal insert in a mounting flange

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850064A (en) * 1954-08-27 1958-09-02 Illinois Tool Works Nut structure having elastic gripping action and sealing means
US3614137A (en) * 1970-04-09 1971-10-19 Perfection Corp Reinforced plastic fitting
US4146059A (en) * 1976-07-16 1979-03-27 J. Lorch Gesselschaft & Co. Kg Plastic member having a reinforcing element at the mouth of a flow aperture thereof
DE3011888A1 (en) * 1980-03-27 1981-10-01 Richard 7066 Baltmannsweiler Halm In line mounting centrifugal pump - has insert in casing with suction channel coupled to suction opening and to impeller
GB2194833A (en) * 1986-07-15 1988-03-16 Automotive Products Plc Hydraulic cylinder structure
EP0919727A1 (en) * 1997-11-28 1999-06-02 WILO GmbH Centrifugal motorpump

Non-Patent Citations (1)

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Title
BUSE F W: "NON-METALLIC PUMPS" WORLD PUMPS, TRADE AND TECHNICAL PRESS LTD. MORDEN, GB, Nr. 5, 1. Mai 1989 (1989-05-01), Seiten 142-145, XP000084075 ISSN: 0262-1762 *

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EP1193397A3 (en) 2002-09-04
EP1193397B1 (en) 2008-06-04
DE10048758A1 (en) 2002-04-11

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