EP1870508B1 - Pump, in particular for household machine using water. - Google Patents

Pump, in particular for household machine using water. Download PDF

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Publication number
EP1870508B1
EP1870508B1 EP07011738A EP07011738A EP1870508B1 EP 1870508 B1 EP1870508 B1 EP 1870508B1 EP 07011738 A EP07011738 A EP 07011738A EP 07011738 A EP07011738 A EP 07011738A EP 1870508 B1 EP1870508 B1 EP 1870508B1
Authority
EP
European Patent Office
Prior art keywords
pump
heating device
heating
pump housing
plastic
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.)
Revoked
Application number
EP07011738A
Other languages
German (de)
French (fr)
Other versions
EP1870508A2 (en
EP1870508A3 (en
Inventor
Heinz-Dieter Dr. Eichholz
Hans-Jürgen Kraffzik
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.)
Aweco Appliance Systems GmbH and Co KG
Original Assignee
Aweco Appliance Systems GmbH and Co KG
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Filing date
Publication date
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Application filed by Aweco Appliance Systems GmbH and Co KG filed Critical Aweco Appliance Systems GmbH and Co KG
Publication of EP1870508A2 publication Critical patent/EP1870508A2/en
Publication of EP1870508A3 publication Critical patent/EP1870508A3/en
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/04—Heating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the invention relates to a pump, in particular for water-bearing domestic appliances such as dishwashers, washing machines or the like according to the preamble of claim 1.
  • the known heating pumps include so-called tubular heaters, which are arranged either outside of the pump housing in heat-conducting contact or else in the interior of the pump housing through which water flows.
  • the tubular heater is usually soldered.
  • the invention has the object to propose a heating pump, which is simple and inexpensive to manufacture.
  • the pump is characterized in that the housing is at least partially made of plastic and the heating device is at least partially positively connected to the plastic of the housing.
  • the integration of the heating device in the pump housing is significantly simplified and thus cheaper to manufacture.
  • the plastic of the pump housing is molded onto the heating device.
  • the positive connection can thus be formed in one operation in the manufacture of the pump housing or the housing part, which is to be connected to the heating device in an injection process. This eliminates separate manufacturing operations for the connection and pump housing.
  • the heating device is arranged in the interior of the pump housing.
  • the heating device is arranged in the pump housing such that the connection ends of the heating device pass through the plastic of the pump housing.
  • the heating device is formed so that it has a heating zone, which is spaced from the plastic.
  • the heat generation of the heating device takes place primarily in this heating zone and thus spaced from the plastic.
  • the thermal load of the plastic, which is positively attached to the heating device, preferably in the region of the terminal ends considerably reduced.
  • this in turn can make the plastic material of a less heat-resistant material, on the other hand, the risk of a defect is reduced by excessive heat on the plastic or completely avoided.
  • a contact zone is furthermore provided for contact with the plastic of the housing, the operating temperature of the contact zone being lower than the operating temperature of the heating zone.
  • the low-temperature contact zone in the region of the connecting elements is provided in connection with the above-mentioned further developing features of the pump, which rest positively on the plastic of the pump housing.
  • the entire wall of the pump housing made of plastic is formed in this area and penetrated by the designed as a low-temperature contact zone terminal areas of the heating device.
  • connection of the heating device can thus be accomplished without problems outside the pump housing.
  • the heating device can be injected at any point after each structural design of the pump housing in the corresponding component of the pump housing. Accordingly, the heating device can be injected into a hollow shape of the pump housing forming the pump chamber or else into a cover to close off a pump housing. A connection in the region of the side walls is possible with the positive connection of the heating device according to the invention to a plastic region of the pump housing.
  • the heating device may comprise a tubular heater as a heating element as in known heating pumps.
  • a tubular heater as a heating element as in known heating pumps.
  • Such tubular heaters have proven to be a in terms of the heating effect, on the other hand, with regard to the electrical insulation already when using heating pumps or water heaters.
  • a preferred arrangement of the heating device may consist in that the heating element of the heating device surrounds an inlet connection to the pump. This allows a Pump construction, in which the heating element at least partially surrounds an axial inlet line at the end. On the opposite end then the arrangement of the pump motor can be easily arranged, for example, with the implementation of a drive shaft to a pump.
  • the heating element itself is preferably surrounded in the flow channel of the liquid to be pumped by this, so that there is an optimal thermal contact.
  • Such a flow channel can be formed by appropriate shaping in the pump housing.
  • specially shaped flow channels which surround the impeller, are advantageous.
  • such a specially shaped flow channel can be adapted in terms of its shape, in particular with regard to its cross section to the impeller and with respect to the efficiency of an optimal pumping behavior.
  • such a flow channel is formed in the flow direction with increasing cross-section. This leads to a volumetric flow which increases in the direction of circulation and which is accelerated by the pump impeller and conveyed outwards into the flow channel.
  • Such a design of the pump ensures good efficiency.
  • an axial offset between the heating device and impeller is further provided.
  • Such an arrangement allows a certain distance between impeller and heating device, so that a good flow around the heating device is ensured by radially circulating liquid during the pumping operation.
  • the pump 1 according to Fig. 1 comprises a two-part pump housing 2.
  • the hollow-shaped main part 4 of the pump housing 2 which surrounds the pump chamber 3 is closed by a cover 5.
  • the main part 4 of the pump housing 2 comprises an inlet connection 6, which is arranged axially and impinges on a pump impeller 7.
  • the impeller 7 is formed as a hollow mold with pump blades 8.
  • the impeller 7 opens radially into a flow channel 9, which has an enlarging cross-section towards the outlet connection 10.
  • a tubular heater is arranged as a heating element 11 in the interior of the flow channel 9, that it is flowed around from all sides. Behind the inlet nozzle 6, one of the connecting elements 12 can be seen, which passes through the wall of the main part 4.
  • a motor housing 13 for receiving a drive motor for the impeller 7, not shown.
  • connection elements 12, 14 can be seen.
  • the part of the pump housing 2 which surrounds the heating device in a form-fitting manner is made of plastic.
  • this is the main part 4 of the pump housing 2, which is penetrated by the connecting elements 12, 14.
  • the heating element 11 is designed such that only the area spaced from the pump housing 2 is formed as a heating zone.
  • a low-temperature contact zone is formed so that the plastic of the pump housing 2 and the main part 4 of the pump housing 2 is thermally less loaded and thus in the event of accidental dry running of the pump switched heater the risk of a defect is prevented by melting the pump housing in the field of positive engagement with the heater.
  • the heating pump according to the invention allows an internal heating element with heating element 11 flowing around on all sides and at least in the region of the heating zone, whereby a high efficiency of the heating device with good heat transfer is ensured. Due to the positive connection with a plastic portion of the housing, a reliable seal with simple and therefore cost-effective production is ensured. In the case of a heating pump according to the invention, it is possible to inject the heating element into the housing in an injection process, which eliminates the need for separate assembly steps and sealing measures in the area of the pump housing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Abstract

The pump (1) has a heating unit (11) staying in heat contact with a liquid-bearing interior of a pump housing (2). The pump housing is partly made of plastic, where the heating unit is connected partially with the plastic in a positive fit manner. The heating unit is arranged in the interior of the pump housing. Connection ends of the heating unit penetrate the plastic of the pump housing. The heating unit has a heating zone placed at a distance from the plastic and a contact zone, where the operating temperature of the contact zone is lower than the operating temperature of the heating zone.

Description

Die Erfindung betrifft eine Pumpe, insbesondere für wasserführende Haushaltsmaschinen wie Geschirrspülmaschinen, Waschmaschinen oder dergleichen nach dem Oberbegriff des Anspruch 1.The invention relates to a pump, in particular for water-bearing domestic appliances such as dishwashers, washing machines or the like according to the preamble of claim 1.

Stand der TechnikState of the art

Für wasserführende Haushaltsmaschinen, wie Geschirrspülmaschinen, Waschmaschinen oder dergleichen sind ebenso wie beispielsweise für Umwälzpumpen von Whirlpools oder dergleichen Pumpen bekannt geworden, die eine Heizungseinrichtung aufweisen, die in Wärmekontakt mit dem flüssigkeitsführenden Innenraum des Pumpengehäuses steht. Mit Hilfe der Heizpumpen kann die umgewälzte Flüssigkeit erhitzt oder auf Temperatur gehalten werden, ohne dass hierzu eine separate Heizung erforderlich ist.For water-bearing domestic appliances, such as dishwashers, washing machines or the like, as well as for circulating pumps of whirlpools or the like pumps have become known, which have a heating device which is in thermal contact with the liquid-carrying interior of the pump housing. With the help of the heating pumps, the circulated liquid can be heated or kept at temperature without the need for separate heating.

Die bekannten Heizpumpen umfassen sog. Rohrheizkörper, die entweder außen am Pumpengehäuse in wärmeleitendem Kontakt oder aber auch im wasserdurchströmten Innenraum des Pumpengehäuses angeordnet sind. Dabei wird zumindest der Bereich des Pumpengehäuses, der das Heizelement umfasst, aus metallischem Material gefertigt, wobei der Rohrheizkörper in der Regel verlötet wird.The known heating pumps include so-called tubular heaters, which are arranged either outside of the pump housing in heat-conducting contact or else in the interior of the pump housing through which water flows. In this case, at least the region of the pump housing, which comprises the heating element, made of metallic material, wherein the tubular heater is usually soldered.

Dokument EP 1 247 993 offenbart eine Pumpe gemäß dem Oberbegriff des Anspruchs 1.document EP 1 247 993 discloses a pump according to the preamble of claim 1.

Ausgehend von einem solchen Stand der Technik hat die Erfindung die Aufgabe, eine Heizpumpe vorzuschlagen, die einfach und kostengünstig in der Fertigung ist.Based on such a prior art, the invention has the object to propose a heating pump, which is simple and inexpensive to manufacture.

Diese Aufgabe wird durch eine Pumpe gemäß dem Oberbegriff des Anspruch 1 durch die Merkmale des kennzeichnenden Teils gelöst.This object is achieved by a pump according to the preamble of claim 1 by the features of the characterizing part.

Durch die in den Unteransprüchen genannten Maßnahmen sind vorteilhafte Ausführungen und Weiterbildungen der Erfindung möglich.The measures mentioned in the dependent claims advantageous embodiments and developments of the invention are possible.

Dementsprechend zeichnet sich die Pumpe dadurch aus, dass das Gehäuse wenigstens teilweise aus Kunststoff besteht und die Heizungseinrichtung wenigstens teilweise formschlüssig mit dem Kunststoff des Gehäuses verbunden ist.Accordingly, the pump is characterized in that the housing is at least partially made of plastic and the heating device is at least partially positively connected to the plastic of the housing.

Durch die Verbindung der Heizungseinrichtung über den Kunststoff des Pumpengehäuses wird die Integration der Heizungseinrichtung in das Pumpengehäuse deutlich vereinfacht und damit in der Fertigung kostengünstiger.By the connection of the heating device via the plastic of the pump housing, the integration of the heating device in the pump housing is significantly simplified and thus cheaper to manufacture.

Vorteilhafterweise wird der Kunststoff des Pumpengehäuses an die Heizungseinrichtung angespritzt. Die formschlüssige Verbindung kann somit in einem Arbeitsgang bei der Fertigung des Pumpengehäuses beziehungsweise des Gehäuseteils, das mit der Heizungseinrichtung zu verbinden ist, in einem Spritzvorgang geformt werden. Hierdurch entfallen separate Fertigungsvorgänge für die Verbindung und Pumpengehäuse.Advantageously, the plastic of the pump housing is molded onto the heating device. The positive connection can thus be formed in one operation in the manufacture of the pump housing or the housing part, which is to be connected to the heating device in an injection process. This eliminates separate manufacturing operations for the connection and pump housing.

In einer vorteilhaften Weiterbildung der Pumpe wird die Heizungseinrichtung im Innenraum des Pumpengehäuses angeordnet. Dies bringt zum einen den Vorteil mit sich, dass der Wärmeübertrag von der Heizungseinrichtung in den flüssigkeitsdurchströmten Innenraum des Pumpengehäuses nicht über das Kunststoffmaterial des Pumpengehäuses, sondern unmittelbar von der Pumpenheizung an die Flüssigkeit im Innenraum des Pumpengehäuses erfolgt. Hierdurch sind die Anforderungen an die Temperaturbeständigkeit des für das Pumpengehäuse verwendeten Kunststoffs deutlich niedriger, da das Pumpengehäuse durch den Flüssigkeitsstrom gekühlt wird, während die Flüssigkeit erhitzt wird.In an advantageous embodiment of the pump, the heating device is arranged in the interior of the pump housing. This brings on the one hand the advantage that the heat transfer from the heating device in the liquid-flow-through interior of the pump housing does not have the plastic material of the pump housing, but takes place directly from the pump heater to the liquid in the interior of the pump housing. As a result, the requirements on the temperature resistance of the plastic used for the pump housing are significantly lower, since the pump housing is cooled by the liquid flow, while the liquid is heated.

In einer besonders vorteilhaften Weiterbildung der Pumpe wird die Heizungseinrichtung so im Pumpengehäuse angeordnet, dass die Anschlussenden der Heizungseinrichtung den Kunststoff des Pumpengehäuses durchsetzen. Hierdurch ist eine mit Ausnahme der Anschlussenden vom Kunststoff des Pumpengehäuses beabstandete Anordnung der Heizungseinrichtung möglich. Auch hier ist die thermische Belastung des Kunststoffs reduziert.In a particularly advantageous development of the pump, the heating device is arranged in the pump housing such that the connection ends of the heating device pass through the plastic of the pump housing. As a result, with the exception of the terminal ends of the plastic of the pump housing spaced arrangement of the heating device is possible. Again, the thermal load of the plastic is reduced.

In der Ausführungsform der Erfindung wird die Heizungseinrichtung so ausgebildet, dass sie eine Heizzone aufweist, die vom Kunststoff beabstandet ist. Die Wärmebildung der Heizungseinrichtung findet vornehmlich in dieser Heizzone und somit vom Kunststoff beabstandet statt. Hierdurch wird wiederum die thermische Belastung des Kunststoffs, der formschlüssig an die Heizungseinrichtung, vorzugsweise im Bereich der Anschlussenden angebracht ist, erheblich eingeschränkt. Zum einen kann hierdurch wiederum das Kunststoffmaterial aus einem weniger hitzebeständigen Material bestehen, zum anderen wird die Gefahr eines Defekt durch übergroße Wärmeeinwirkung auf den Kunststoff vermindert beziehungsweise ganz vermieden.In the embodiment of the invention, the heating device is formed so that it has a heating zone, which is spaced from the plastic. The heat generation of the heating device takes place primarily in this heating zone and thus spaced from the plastic. As a result, in turn, the thermal load of the plastic, which is positively attached to the heating device, preferably in the region of the terminal ends, considerably reduced. On the one hand, this in turn can make the plastic material of a less heat-resistant material, on the other hand, the risk of a defect is reduced by excessive heat on the plastic or completely avoided.

Vorzugsweise wird bei einer Heizungseinrichtung mit Heizzone weiterhin eine Kontaktzone zum Kontakt mit dem Kunststoff des Gehäuses vorgesehen, wobei die Betriebstemperatur der Kontaktzone niedriger ist als die Betriebstemperatur der Heizzone. Durch eine solche als Niedertemperaturzone ausgebildete Kontaktzone wird wiederum der Kunststoff im Bereich des Formschlusses mit der Heizungseinrichtung vor übermäßiger Temperatureinwirkung geschont.Preferably, in a heating device with a heating zone, a contact zone is furthermore provided for contact with the plastic of the housing, the operating temperature of the contact zone being lower than the operating temperature of the heating zone. By such formed as a low-temperature zone contact zone, in turn, the plastic in Protected area of the positive connection with the heating device from excessive temperature.

Erfindungsgemäß wird in Verbindung mit den oben genannten weiterbildenden Merkmalen der Pumpe die Niedertemperatur-Kontaktzone im Bereich der Anschlusselemente vorgesehen, die formschlüssig am Kunststoff des Pumpengehäuses anliegen. Vorzugsweise wird in diesem Bereich die komplette Wandung des Pumpengehäuses aus Kunststoff ausgebildet und von den als Niedertemperatur-Kontaktzone ausgebildeten Anschlussbereichen der Heizungseinrichtung durchsetzt.According to the invention, the low-temperature contact zone in the region of the connecting elements is provided in connection with the above-mentioned further developing features of the pump, which rest positively on the plastic of the pump housing. Preferably, the entire wall of the pump housing made of plastic is formed in this area and penetrated by the designed as a low-temperature contact zone terminal areas of the heating device.

Der Anschluss der Heizungseinrichtung kann somit außerhalb des Pumpengehäuses problemlos bewerkstelligt werden. Die Heizungseinrichtung kann dabei an beliebiger Stelle nach je konstruktiver Ausgestaltung des Pumpengehäuses in das entsprechende Bauteil des Pumpengehäuses eingespritzt werden. Die Heizungseinrichtung kann demnach in eine die Pumpenkammer bildende Hohlform des Pumpengehäuses oder aber auch in einen Deckel zum Abschluss eines Pumpengehäuses eingespritzt werden. Auch eine Verbindung im Bereich der Seitenwände ist mit der erfindungsgemäßen formschlüssigen Verbindung der Heizungseinrichtung an einen Kunststoffbereich des Pumpengehäuses möglich.The connection of the heating device can thus be accomplished without problems outside the pump housing. The heating device can be injected at any point after each structural design of the pump housing in the corresponding component of the pump housing. Accordingly, the heating device can be injected into a hollow shape of the pump housing forming the pump chamber or else into a cover to close off a pump housing. A connection in the region of the side walls is possible with the positive connection of the heating device according to the invention to a plastic region of the pump housing.

Bei einer erfindungsgemäßen Pumpe kann die Heizungseinrichtung wie bei bekannten Heizpumpen einen Rohrheizkörper als Heizelement umfassen. Derartige Rohrheizkörper haben sich zum einem im Hinblick auf die Heizwirkung, zum anderen auch im Hinblick auf die elektrische Isolation bereits beim Einsatz von Heizpumpen oder Durchlauferhitzern bewährt.In a pump according to the invention, the heating device may comprise a tubular heater as a heating element as in known heating pumps. Such tubular heaters have proven to be a in terms of the heating effect, on the other hand, with regard to the electrical insulation already when using heating pumps or water heaters.

Eine bevorzugte Anordnung der Heizeinrichtung kann darin bestehen, dass das Heizelement der Heizungseinrichtung einen Einlassstutzen zur Pumpe umgibt. Dies ermöglicht eine Pumpenkonstruktion, bei der das Heizelement stirnseitig eine axiale Einlassleitung wenigstens teilweise umschließt. Auf der gegenüberliegenden Stirnseite kann sodann problemlos die Anordnung des Pumpenmotors, z.B. mit der Durchführung einer Antriebswelle zu einem Pumpenrad angeordnet werden. Das Heizelement selbst wird dabei vorzugsweise im Strömungskanal der zu pumpenden Flüssigkeit von dieser umspült, so dass sich ein optimaler Wärmekontakt ergibt.A preferred arrangement of the heating device may consist in that the heating element of the heating device surrounds an inlet connection to the pump. This allows a Pump construction, in which the heating element at least partially surrounds an axial inlet line at the end. On the opposite end then the arrangement of the pump motor can be easily arranged, for example, with the implementation of a drive shaft to a pump. The heating element itself is preferably surrounded in the flow channel of the liquid to be pumped by this, so that there is an optimal thermal contact.

Ein solcher Strömungskanal kann durch entsprechende Formgebung im Pumpengehäuse ausgeformt werden. Bei Kreiselpumpen sind eigens ausgeformte Strömungskanäle, die das Pumpenrad umgeben, von Vorteil. Insbesondere kann ein solcher eigens ausgeformter Strömungskanal hinsichtlich seiner Form insbesondere hinsichtlich seines Querschnitts an das Pumpenrad und bezügliche des Wirkungsgrades auf ein optimales Pumpverhalten hin angepasst werden. Vorzugsweise wird ein solcher Strömungskanal in Strömungsrichtung mit sich vergrößerndem Querschnitt ausgebildet. Dies führt zu einem sich in Umlaufrichtung vergrößerndem Volumenstrom des durch das Pumpenrad beschleunigten und nach außen geförderten Flüssigkeitsstrom im Strömungskanal. Eine solche Ausgestaltung der Pumpe sorgt für einen guten Wirkungsgrad.Such a flow channel can be formed by appropriate shaping in the pump housing. For centrifugal pumps, specially shaped flow channels, which surround the impeller, are advantageous. In particular, such a specially shaped flow channel can be adapted in terms of its shape, in particular with regard to its cross section to the impeller and with respect to the efficiency of an optimal pumping behavior. Preferably, such a flow channel is formed in the flow direction with increasing cross-section. This leads to a volumetric flow which increases in the direction of circulation and which is accelerated by the pump impeller and conveyed outwards into the flow channel. Such a design of the pump ensures good efficiency.

In einer anderen Ausführungsform der Erfindung wird weiterhin ein Axialversatz zwischen Heizungseinrichtung und Pumpenrad vorgesehen. Eine solche Anordnung ermöglicht einen gewissen Abstand zwischen Pumpenrad und Heizungseinrichtung, so dass eine gute Umströmung der Heizungseinrichtung durch radial umlaufende Flüssigkeit während des Pumpvorgangs gewährleistet ist.In another embodiment of the invention, an axial offset between the heating device and impeller is further provided. Such an arrangement allows a certain distance between impeller and heating device, so that a good flow around the heating device is ensured by radially circulating liquid during the pumping operation.

Neben den beschriebenen Ausführungsvarianten sind unterschiedlichste Arten von Pumpengestaltungen unter Nutzung der Erfindung möglich. Wesentlich ist dabei stets, dass die Heizungseinrichtung formschlüssig mit einem Kunststoffbereich des Pumpengehäuses ausgebildet wird.In addition to the described embodiments, various types of pump designs using the invention are possible. It is always essential that the heating device form fit with a plastic area the pump housing is formed.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird an Hand der Figuren nachstehend näher erläutert.An embodiment of the invention is illustrated in the drawing and will be explained with reference to the figures below.

Im einzelnen zeigen

Fig. 1
eine perspektivische Schnittdarstellung durch eine erfindungsgemäße Heizpumpe und
Fig. 2
eine perspektivische Seitenansicht einer Heizpumpe gemäß Fig. 1.
Show in detail
Fig. 1
a perspective sectional view through a heating pump according to the invention and
Fig. 2
a perspective side view of a heating pump according to Fig. 1 ,

Die Pumpe 1 gemäß Fig. 1 umfasst ein zweiteiliges Pumpengehäuse 2. Das die Pumpenkammer 3 umfassende hohlförmige Hauptteil 4 des Pumpengehäuses 2 ist mit einem Deckel 5 verschlossen. Das Hauptteil 4 des Pumpengehäuses 2 umfasst einen Einlaufstutzen 6, der axial angeordnet ist und auf ein Pumpenrad 7 trifft. Das Pumpenrad 7 ist als Hohlform mit Pumpenschaufeln 8 ausgebildet. Radial mündet das Pumpenrad 7 in einen Strömungskanal 9, der zum Auslaufstutzen 10 hin einen sich vergrößernden Querschnitt aufweist. Axial gegenüber dem Pumpenrad 8 versetzt ist ein Rohrheizkörper als Heizelement 11 so im Inneren des Strömungskanals 9 angeordnet, dass er von allen Seiten umströmt wird. Hinter dem Einlassstutzen 6 ist eines der Anschlusselemente 12 erkennbar, das die Wandung des Hauptteils 4 durchsetzt.The pump 1 according to Fig. 1 comprises a two-part pump housing 2. The hollow-shaped main part 4 of the pump housing 2 which surrounds the pump chamber 3 is closed by a cover 5. The main part 4 of the pump housing 2 comprises an inlet connection 6, which is arranged axially and impinges on a pump impeller 7. The impeller 7 is formed as a hollow mold with pump blades 8. The impeller 7 opens radially into a flow channel 9, which has an enlarging cross-section towards the outlet connection 10. Axially offset from the pump 8, a tubular heater is arranged as a heating element 11 in the interior of the flow channel 9, that it is flowed around from all sides. Behind the inlet nozzle 6, one of the connecting elements 12 can be seen, which passes through the wall of the main part 4.

Auf der gegenüberliegenden Seite schließt sich an einen Deckel 5 ein Motorgehäuse 13 zur Aufnahme eines nicht dargestellten Antriebsmotors für das Pumpenrad 7 an.On the opposite side is followed by a cover 5, a motor housing 13 for receiving a drive motor for the impeller 7, not shown.

In der geschlossenen Seitenansicht gemäß Fig. 2 sind beide Anschlusselemente 12, 14 erkennbar.In the closed side view according to Fig. 2 Both connection elements 12, 14 can be seen.

Erfindungsgemäß wird der Teil des Pumpengehäuses 2, der die Heizungseinrichtung formschlüssig umgibt, aus Kunststoff gefertigt. Beim vorliegenden Ausführungsbeispiel ist dies das Hauptteil 4 des Pumpengehäuses 2, das von den Anschlusselementen 12, 14 durchsetzt wird. Im Bereich dieser Anschlusselemente 12, 14 findet dabei der Formschluss zum Pumpengehäuse 2 statt. Das Heizelement 11 ist so ausgestaltet, dass nur der beabstandet vom Pumpengehäuse 2 liegende Bereich als Heizzone ausgebildet ist. Im Bereich der die Wandung des Pumpengehäuses 2 durchsetzende Anschlüsse 12, 14 hingegen ist eine Niedertemperatur-Kontaktzone ausgebildet, so dass der Kunststoff des Pumpengehäuses 2 beziehungsweise des Hauptteils 4 des Pumpengehäuses 2 thermisch weniger belastet wird und somit auch im Fall eines versehentlichen Trockenlaufs der Pumpe mit eingeschalteter Heizung die Gefahr eines Defekts durch Schmelzen des Pumpengehäuses im Bereich des Formschlusses mit der Heizeinrichtung unterbunden ist.According to the invention, the part of the pump housing 2 which surrounds the heating device in a form-fitting manner is made of plastic. In the present embodiment, this is the main part 4 of the pump housing 2, which is penetrated by the connecting elements 12, 14. In the area of these connection elements 12, 14, the positive connection to the pump housing 2 takes place. The heating element 11 is designed such that only the area spaced from the pump housing 2 is formed as a heating zone. In the area of the wall of the pump housing 2 passing through terminals 12, 14, however, a low-temperature contact zone is formed so that the plastic of the pump housing 2 and the main part 4 of the pump housing 2 is thermally less loaded and thus in the event of accidental dry running of the pump switched heater the risk of a defect is prevented by melting the pump housing in the field of positive engagement with the heater.

Die Heizpumpe gemäß der Erfindung ermöglicht zum einen ein innenliegendes Heizelement mit allseitig und wenigstens im Bereich der Heizzone umströmten Heizelement 11, wodurch ein hoher Wirkungsgrad der Heizungseinrichtung mit gutem Wärmeübergang gewährleistet ist. Durch den Formschluss mit einem Kunststoffbereich des Gehäuses ist eine zuverlässige Dichtigkeit bei einfacher und damit kostengünstiger Fertigung gewährleistet. Es besteht bei einer erfindungsgemäßen Heizpumpe die Möglichkeit, das Heizelement in einem Spritzvorgang in das Gehäuse einzuspritzen, wodurch separate Montageschritte und Dichtmaßnahmen im Bereich des Pumpengehäuses entfallen.The heating pump according to the invention, on the one hand, allows an internal heating element with heating element 11 flowing around on all sides and at least in the region of the heating zone, whereby a high efficiency of the heating device with good heat transfer is ensured. Due to the positive connection with a plastic portion of the housing, a reliable seal with simple and therefore cost-effective production is ensured. In the case of a heating pump according to the invention, it is possible to inject the heating element into the housing in an injection process, which eliminates the need for separate assembly steps and sealing measures in the area of the pump housing.

Darüber hinaus ist bei einer erfindungsgemäßen Pumpe die Möglichkeit gegeben, auch das gesamte Pumpengehäuse aus Kunststoff zu fertigen, wodurch sowohl der Aufwand zur Formung des Pumpengehäuses als auch der Materialaufwand für das Pumpengehäuse deutlich reduzierbar sind. Die erfindungsgemäßen Vorteile sind insbesondere bei großen Stückzahlen, wie sie beim Einsatz in Haushaltsgeräten, wie Waschmaschinen oder Geschirrspülmaschinen vorliegen, vorhanden. Es sind jedoch durchaus auch andere vorteilhafte Anwendung der Erfindung, zum Beispiel als Umwälzpumpe eines Whirlpools oder dergleichen denkbar.In addition, in a pump according to the invention given the opportunity to produce the entire pump housing made of plastic, whereby both the effort for Forming of the pump housing and the cost of materials for the pump housing are significantly reduced. The advantages according to the invention are available, in particular, in the case of large quantities, such as those used in household appliances, such as washing machines or dishwashers. However, there are quite another advantageous application of the invention, for example, as a circulating pump of a hot tub or the like conceivable.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Pumpepump
22
Pumpengehäusepump housing
33
Pumpenkammerpump chamber
44
HauptteilBulk
55
Deckelcover
66
Einlaufstutzenflowguide
77
Pumpenrad .Impeller.
88th
Pumpenschaufelpump blade
99
Strömungskanalflow channel
1010
Auslassstutzenoutlet
1111
Heizelementheating element
1212
Anschlusselementconnecting element
1313
Motorgehäusemotor housing
1414
Anschlusselementconnecting element

Claims (10)

  1. Pump, in particular for water-using domestic appliances, such as dishwashers, washing machines or the like, comprising a pump housing and a heating device, which is in thermal contact with the liquid-guiding interior of the pump housing (2), wherein the pump housing (2) is made at least partly of plastic and the heating device (11, 12, 14) is at least partly connected to the plastic in an interlocking manner, characterised in that the heating device (11, 12, 14) is designed such that only the area spaced apart from the pump housing (2) is defined as the heating zone, whereby in the region of the connections (12, 14) passing through the wall of the pump housing (2) a low temperature contact zone is formed for contact with the plastic of the housing (2), wherein the operating temperature of the contact zone is lower than the operating temperature of the heating zone.
  2. Pump according to claim 1, characterised in that the plastic is injection-moulded onto the heating device (12, 14).
  3. Pump according to either of the preceding claims, characterised in that the heating device is arranged in the interior of the pump housing (2).
  4. Pump according to one of the preceding claims, characterised in that the heating device has a contact zone for making contact with the plastic of the housing, wherein the operating temperature of the contact zone is lower than the operating temperature of the heating zone.
  5. Pump according to one of the preceding claims, characterised in that the heating device comprises a tubular heating body as the heating element.
  6. Pump according to one of the preceding claims, characterised in that the heating element of the heating device surrounds an inlet connection piece (6) to the pump.
  7. Pump according to one of the preceding claims, characterised in that the heating element of the heating device is arranged in a flow channel (9) of the pump housing (2).
  8. Pump according to one of the preceding claims, characterised in that the cross section of the flow channel (9) increases in size along the water flow.
  9. Pump according to one of the preceding claims, characterised in that the flow channel (9) is arranged radially outside a pump impeller (7).
  10. Pump according to one of the preceding claims, characterised in that the heating device (11) has an axial offset In relation to the pump impeller (7).
EP07011738A 2006-06-21 2007-06-15 Pump, in particular for household machine using water. Revoked EP1870508B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006028913A DE102006028913A1 (en) 2006-06-21 2006-06-21 Pump, in particular for water-bearing household machines

Publications (3)

Publication Number Publication Date
EP1870508A2 EP1870508A2 (en) 2007-12-26
EP1870508A3 EP1870508A3 (en) 2008-05-28
EP1870508B1 true EP1870508B1 (en) 2011-01-05

Family

ID=38529395

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07011738A Revoked EP1870508B1 (en) 2006-06-21 2007-06-15 Pump, in particular for household machine using water.

Country Status (5)

Country Link
US (1) US7965928B2 (en)
EP (1) EP1870508B1 (en)
CN (1) CN101096953B (en)
AT (1) ATE494414T1 (en)
DE (2) DE102006028913A1 (en)

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Also Published As

Publication number Publication date
CN101096953A (en) 2008-01-02
US7965928B2 (en) 2011-06-21
CN101096953B (en) 2012-09-26
US20080044168A1 (en) 2008-02-21
EP1870508A2 (en) 2007-12-26
DE502007006153D1 (en) 2011-02-17
EP1870508A3 (en) 2008-05-28
DE102006028913A1 (en) 2007-12-27
ATE494414T1 (en) 2011-01-15

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