EP1247993B1 - Pump, in particular centrifugal circulating pump for household appliances using water - Google Patents

Pump, in particular centrifugal circulating pump for household appliances using water Download PDF

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Publication number
EP1247993B1
EP1247993B1 EP02005593A EP02005593A EP1247993B1 EP 1247993 B1 EP1247993 B1 EP 1247993B1 EP 02005593 A EP02005593 A EP 02005593A EP 02005593 A EP02005593 A EP 02005593A EP 1247993 B1 EP1247993 B1 EP 1247993B1
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EP
European Patent Office
Prior art keywords
pump
circulating pump
housing
impeller
chamber
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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.)
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EP02005593A
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German (de)
French (fr)
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EP1247993A2 (en
EP1247993A3 (en
Inventor
Walter Assmann
Ulrich Hettenhausen
Volker Marks
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Miele und Cie KG
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Miele und Cie KG
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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
    • F04D29/58—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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4285—Water-heater arrangements
    • 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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the tubular heater (7) is circumferentially annular preferably wound in the manner of a wound cylindrical coil with one or more windings and surrounds the impeller (6) concentrically.
  • Such a coiled tubular heater (7) of the heating device (2) is advantageously mounted in the pump housing (3), for example, the pump cover, the electrical connections (9) insulated and liquid-tight pass through the cup-shaped housing wall of the pump housing (3).
  • the pump housing (3) is helical designed for the pressure build-up of the rinsing liquid to be conveyed in the usual training and removably mounted on the motor housing (10) of the pump.
  • the present invention solves, in particular in Fig. 2 represented, this problem in that on the one hand the pump housing (3) of the circulating pump (1) with a the impeller (6) rotationally symmetrical surrounding pump chamber (11) is formed.
  • the heating device (2) in the form of a tubular heater (7), which as a spiral ( Fig.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cookers (AREA)

Abstract

Pump has a pump housing (3) with a pump chamber (11) arranged in a rotationally symmetric manner about an impeller (6). A diffuser chamber (13) is arranged downstream from the impeller chamber to change a part of the flow speed into pressure. Downstream from the diffuser is a pressure chamber (14) in which the flow is calmed prior to delivery to a number of pressure branches (5, 5') which branch off from the chamber. A heater (2) is contained within the pressure chamber.

Description

Die Erfindung betrifft eine Umwälzpumpe für wasserführende Haushaltgeräte, wie Geschirrspülmaschinen oder Waschmaschinen, welche mit einer elektrischen Heizungseinrichtung innerhalb des Pumpengehäuses zur Spülwassererwärmung ausgebildet ist, und bei welcher das Pumpengehäuse mit Ansaugstutzen und Druckstutzen und mit einem im Gehäuse umlaufenden radial verdichtenden Laufrad für den Transport der Spülflüssigkeit versehen ist, wobei das Pumpengehäuse der Umwälzpumpe mit einer das Laufrad rotationssymmetrisch umgebenden Pumpenkammer ausgebildet ist, welche in einen das Laufrad aufnehmenden strömungsintensiven Laufradraum, einen dem Laufradraum nachgeschalteten Diffusorraum, in dem ein Teil der Strömungsgeschwindigkeit in Druck umgewandelt wird, und in einen diesem Raum nachgeordneten strömungsberuhigten Druckraum geteilt ist, von welchem ein oder mehrere Druckstutzen abzweigen und in welchem sich die Heizungseinrichtung befindet.The invention relates to a circulating pump for water-bearing domestic appliances, such as dishwashers or washing machines, which is formed with an electric heating device within the pump housing for Spülwassererwärmung, and in which the pump housing with intake manifold and discharge nozzle and with a circulating in the housing radially compressing impeller for the transport of the rinsing liquid is provided, wherein the pump housing of the circulating pump is formed with a rotationally symmetrical surrounding the impeller pump chamber, which in a impeller receiving flow-intensive impeller space, a downstream of the impeller space diffuser space in which a portion of the flow velocity is converted into pressure, and in this space downstream flow-calmed pressure chamber is divided, branch off from which one or more pressure port and in which the heating device is located.

Eine Umwälzpumpe mit einer integrierten Heizeinrichtung ist aus der DE 198 52 569 A1 bekannt. Die bei dem bekannten Technikstand innerhalb des Pumpengehäuses im freien Wasserlauf zwischen Ansaug- und Druckstutzen der Pumpe angeordnete Heizungseinrichtung erzeugt einen schlechten Pumpenwirkungsgrad durch eine unkontrollierbare Verwirbelung der strömenden Spülflüssigkeit infolge der freiliegenden Rohrheizkörper. Wegen der ungünstigen Anströmung der Rohrheizkörper mit der mehr oder weniger schmutzbelasteten Spülflüssigkeit besitzt die bekannte Pumpe darüber hinaus eine erhöhte Verschmutzungsneigung. Die freiliegend im Pumpendruckraum angeordnete Heizungseinrichtung schränkt auch die Unterbringung oder Anordnung der Druckstutzen am Pumpengehäuse wesentlich ein und schafft zudem ein hohes Bauvolumen des Pumpenraumes mit einem unerwünscht großen ungenutzten Frei- oder Totraum. Auch hier soll die Erfindung Abhilfe schaffen.A circulating pump with an integrated heater is out of the DE 198 52 569 A1 known. The arranged in the known art level within the pump housing in the free water passage between the intake and discharge ports of the pump heater generates a poor pump efficiency by an uncontrollable turbulence of the flowing rinse liquid due to the exposed tubular heater. Because of the unfavorable flow of the tubular heater with the more or less polluted rinsing liquid, the known pump also has an increased tendency to fouling. The heating device, which is arranged exposed in the pump pressure chamber, also considerably restricts the placement or arrangement of the discharge nozzles on the pump housing and also creates a high construction volume of the pump chamber with an undesirably large unused free or dead space. Again, the invention is intended to remedy this.

Aus der US-A-4 594 500 ist eine Umwälzpumpe mit integrierter Heizeinrichtung bekannt, bei der dem Laufradraum ein Diffusorraum nachgeschaltet ist. Dabei handelt es sich um einen Schneckendiffusor. Die Unterbringung einer Heizung in einem Schneckengehäuse erfordert einen sehr großen Diffusor. Hieraus resultiert eine geringe Strömungsgeschwindigkeit, was wiederum einen schlechten Abtransport der Heizungswärme zur Folge hat. Durch die hohe Oberflächentemperatur besteht die Gefahr des Verkalkens und einer Verkürzung der Lebensdauer der Heizung. Außerdem wirkt sich ein großer Diffusor nachteilig auf den Wirkungsgrad der Pumpe aus und der Bauraumbedarf ist sehr hoch.From the US-A-4 594 500 a circulation pump with integrated heating device is known in which the impeller space is followed by a diffuser space. It is a screw diffuser. The placement of a heater in a screw housing requires a very large diffuser. This results in a low flow velocity, which in turn has a bad removal of heating heat result. Due to the high surface temperature there is a risk of calcification and a shortening of the service life of the heater. In addition, a large diffuser adversely affects the efficiency of the pump and the space requirement is very high.

Aus der US-A-5 701 388 ist eine Umwälzpumpe mit integrierter Heizung bekannt, bei der die Heizung direkt hinter dem Laufradboden angeordnet ist. Ein Diffusor ist dort nicht vorhanden. Der Raum hinter dem Laufradboden ist sehr stark strömungsberuhigt, so dass eine ausreichende Umströmung des Heizkörpers nicht gewährleistet wird. Auch hier ergibt sich durch das Fehlen des Diffusors ein schlechter Wirkungsgrad.From the US-A-5,701,388 is a circulating pump with integrated heating known in which the heater is located directly behind the impeller floor. A diffuser is not there. The space behind the impeller floor is very much flow-calmed, so that a sufficient flow around the radiator is not guaranteed. Again, there is a poor efficiency due to the absence of the diffuser.

Der Erfindung stellt sich somit das Problem, eine Umwälzpumpe mit geringem Bauvolumen und einem guten Pumpenwirkungsgrad sowie optimalen Anströmverhältnissen der Rohrheizkörper der integrierten Heizungseinrichtung zu schaffen.The invention thus raises the problem of creating a circulation pump with a low volume and a good pump efficiency and optimal flow conditions of the tubular heater of the integrated heating device.

Ausgehend von einer Pumpe, insbesondere einer Kreiselpumpe als Umwälzpumpe für wasserführende Haushaltgeräte wird dieses Problem erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.Starting from a pump, in particular a centrifugal pump as a circulating pump for water-bearing household appliances, this problem is solved according to the invention with the features of claim 1. Advantageous embodiments and further developments of the invention will become apparent from the following subclaims.

Durch die Rotationssymmetrie des Pumpengehäuses ist ein einfacher modularer Aufbau aller Pumpenbauteile möglich. Die Symmetrie der Pumpenkammer bewirkt eine weitestgehend parallele Anströmung der ringförmig gewickelten Rohrheizkörper bezüglich deren Längsachse der im Pumpengehäuse integrierten Heizungseinrichtung, wodurch eine Wirbelbildung und Strömungsablösungen, die zu lokalen Überhitzungen führen können, wirksam vermieden werden. Insbesondere begünstigt der rotationssymmetrische als strömungsberuhigter Druckraum abgeteilte Pumpenraum, in dem sich die Heizungseinrichtung befindet, die gleichmäßige Strömung mit guter Wärmeabfuhr bei niedriger Wandreibung an den Heizungsrohren, so dass der Pumpenwirkungsgrad nicht negativ beeinflusst wird.Due to the rotational symmetry of the pump housing, a simple modular construction of all pump components is possible. The symmetry of the pump chamber causes a largely parallel flow of annularly wound tubular heater with respect to the longitudinal axis of the integrated pump housing in the heating device, whereby a vortex formation and flow separation, which can lead to local overheating, can be effectively avoided. In particular, the rotationally symmetrical pump chamber, which is divided off as a flow-calmed pressure chamber and in which the heating device is located, favors the uniform flow Flow with good heat dissipation with low wall friction on the heating pipes, so that the pump efficiency is not adversely affected.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt

Figur 1
eine als Kreiselpumpe ausgebildete Umwälzpumpe nach dem Stand der Technik mit geöffnetem Pumpengehäuse und eingebauter Heizungseinrichtung, in perspektivischer Ansicht,
Figur 2
eine Umwälzpumpe mit eingebauter Heizungseinrichtung und mit einem Pumpengehäuse nach der Erfindung im Längsschnitt,
Figur 3
das Pumpengehäuse in einer anderen Ausführung, im Längsschnitt,
Figur 4
ein weiteres Ausführungsbeispiel für das Pumpengehäuse.
An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. It shows
FIG. 1
a trained as a centrifugal circulation pump according to the prior art with an open pump housing and built-in heating device, in perspective view,
FIG. 2
a circulation pump with built-in heating device and with a pump housing according to the invention in longitudinal section,
FIG. 3
the pump housing in another embodiment, in longitudinal section,
FIG. 4
a further embodiment of the pump housing.

Eine in Figur 1 dargestellte an sich bekannte Pumpe, insbesondere eine Kreiselpumpe als Umwälzpumpe (1) für wasserführende Haushaltgeräte, wie Geschirrspülmaschinen oder Waschmaschinen ist mit einer elektrischen Heizungseinrichtung (2) innerhalb des Pumpengehäuses (3) zur Spülwassererwärmung ausgebildet, wobei das Pumpengehäuse (3) mit Ansaug- und Druckstutzen (4 bzw. 5, 5') und mit einem im Gehäuse umlaufenden radial verdichtenden Laufrad (6) für den Transport der Spülflüssigkeit versehen ist. Die Heizungseinrichtung (2) zur Erwärmung von in dem vorerwähnten wasserführenden Gerät benutzte Spüloder Reinigungsflüssigkeit ist im Pumpengehäuse (3) im Wasserlauf der Umwälzpumpe (1) zwischen Ansaugstutzen (4) und Druckstutzen (5, 5') installiert und als ein von der Spülflüssigkeit umspülter Rohrheizkörper (7) ausgebildet. Durch die Anordnung der Heizung im Wasserlauf werden Wärmeverluste vorteilhaft vermieden. Der Rohrheizkörper (7) ist umlaufend ringförmig vorzugsweise in Art einer gewickelten Zylinderspule mit einer oder mehreren Windungen gewunden und umgibt das Laufrad (6) konzentrisch. Ein so gewundener Rohrheizkörper (7) der Heizungseinrichtung (2) ist vorteilhaft im Pumpengehäuse (3) beispielsweise am Pumpendeckel montiert, wobei die elektrischen Anschlüsse (9) isoliert und flüssigkeitsdicht die topfförmige Gehäusewand des Pumpengehäuses (3) durchgreifen. Das Pumpengehäuse (3) ist für den Druckaufbau der zu fördernden Spülflüssigkeit in üblicher Ausbildung schneckenförmig gestaltet und lösbar am Motorgehäuse (10) der Pumpe montiert. Die im Pumpengehäuse (3) angeordnete Heizeinrichtung mit dem freiliegenden umspülten Rohrheizkörper (7) bildet mit dem umgebenden Pumpengehäuse (3) einen Durchlauferhitzer mit guter Leistungsausnutzung und mit hohem Wirkungsgrad, da alle Wärme bei der Spülwasserumwälzung auf die Spülflüssigkeit direkt übertragen wird. Jedoch ist der Pumpenwirkungsgrad nicht als optimal anzusehen, weil die innerhalb des Pumpengehäuses (3) im freien Wasserlauf zwischen Ansaug- und Druckstutzen (4 bzw. 5, 5') der Pumpe angeordneten Rohrheizkörper (7) eine unkontrollierbare Verwirbelung der strömenden Spülflüssigkeit infolge der freiliegenden Rohrheizkörper (7) erzeugen.An in FIG. 1 illustrated per se known pump, in particular a centrifugal pump as a circulating pump (1) for water-bearing appliances, such as dishwashers or washing machines with an electric heater (2) within the pump housing (3) for Spülwassererwärmung formed, wherein the pump housing (3) with suction and Pressure port (4 or 5, 5 ') and provided with a circulating in the housing radially compressing impeller (6) for the transport of the rinsing liquid. The heating device (2) for heating used in the aforementioned water-conducting device Spüloder cleaning liquid is in the pump housing (3) in the watercourse of the circulation pump (1) between the intake (4) and discharge nozzle (5, 5 ') installed and as one of the rinsing liquid umspülter Tubular heater (7) formed. The arrangement of the heater in the watercourse heat losses are advantageously avoided. The tubular heater (7) is circumferentially annular preferably wound in the manner of a wound cylindrical coil with one or more windings and surrounds the impeller (6) concentrically. Such a coiled tubular heater (7) of the heating device (2) is advantageously mounted in the pump housing (3), for example, the pump cover, the electrical connections (9) insulated and liquid-tight pass through the cup-shaped housing wall of the pump housing (3). The pump housing (3) is helical designed for the pressure build-up of the rinsing liquid to be conveyed in the usual training and removably mounted on the motor housing (10) of the pump. The arranged in the pump housing (3) heater with the exposed flushed tubular heater (7) forms with the surrounding pump housing (3) a water heater with good power efficiency and high efficiency, since all heat is transferred directly to the rinse liquid in the rinse water circulation. However, the pump efficiency is not optimal to see because within the pump housing (3) in the free water passage between the intake and discharge ports (4 or 5, 5 ') arranged the pump tubular heater (7) produce an uncontrollable turbulence of the flowing rinsing liquid due to the exposed tubular heater (7).

Die vorliegende Erfindung löst, wie insbesondere in Fig. 2 dargestellt, diese Problem dadurch, dass zum einen das Pumpengehäuse (3) der Umwälzpumpe (1) mit einer das Laufrad (6) rotationssymmetrisch umgebenden Pumpenkammer (11) ausgebildet ist. Zum anderen ist die kreisförmige Pumpenkammer (11) in einen das Laufrad (6) aufnehmenden strömungsintensiven Laufradraum (12), einen dem Laufradraum (12) nachgeschalteten Diffusorraum (13), in dem ein Teil der Strömungsgeschwindigkeit in Druck umgewandelt wird, und in einen diesem Raum nachgeordneten strömungsberuhigten Druckraum (14) geteilt. Von dem strömungsberuhigten Druckraum (14) zweigen ein oder mehrere Druckstutzen (5, 5') ab. In diesem Druckraum (14) befindet sich auch erfindungsgemäß die Heizungseinrichtung (2) in der Ausbildung als Rohrheizkörper (7), welcher als Spirale (Fig. 4) bzw. umlaufend ringförmig (Fig. 2, 3 und 4) vorzugsweise in Art einer gewickelten Zylinderspule ein- oder mehrfach gewunden ist. Die Heizungseinrichtung (2) ist somit im strömungsberuhigten Druckraum (14) als rotationssymmetrisches ringförmiges Heizmodul (Rohrheizkörper 7) ausgebildet. Gemäß Fig. 2 ist der Rohrheizkörper (7) dabei einfach gewunden und vorzugsweise am Pumpen-Gehäusedeckel (8), sh. auch Fig. 4, der Umwälzpumpe (1) z. B. lösbar befestigt, wobei gemäß Fig. 2 noch ein Sicherheitsabstand zu den Wandungen des Pumpengehäuses (3) eingehalten ist. Der aus Kunststoff oder Metall bestehende separate Pumpen-Gehäusedeckel (8) schließt das Pumpengehäuse (3) flüssigkeitsdicht (Ringdichtung 15) ab.The present invention solves, in particular in Fig. 2 represented, this problem in that on the one hand the pump housing (3) of the circulating pump (1) with a the impeller (6) rotationally symmetrical surrounding pump chamber (11) is formed. On the other hand, the circular pump chamber (11) in a the impeller (6) receiving flow-intensive impeller space (12), a the impeller space (12) downstream diffuser chamber (13) in which a part of the flow velocity is converted into pressure, and in this Room downstream flow-calmed pressure chamber (14) divided. From the flow-calmed pressure chamber (14) branch off one or more discharge nozzles (5, 5 '). In this pressure chamber (14) is also according to the invention, the heating device (2) in the form of a tubular heater (7), which as a spiral ( Fig. 4 ) or circumferentially annular ( Fig. 2 . 3 and 4 ) is preferably one or more wound in the manner of a wound cylindrical coil. The heating device (2) is thus formed in the flow-calmed pressure chamber (14) as a rotationally symmetrical annular heating module (tubular heater 7). According to Fig. 2 the tubular heater (7) is simply wound and preferably on the pump housing cover (8), sh. also Fig. 4 , the circulating pump (1) z. B. releasably secured, according to Fig. 2 still a safety distance to the walls of the pump housing (3) is maintained. The plastic or metal separate pump housing cover (8) closes the pump housing (3) liquid-tight (ring seal 15).

Zur Erzielung eines optimalen Druckaufbaus in der rotationsymmetrischen Pumpenkammer (11) ist der Diffusorraum (13) als Ringdiffusor ausgebildet. Der Diffusorraum (13) wird durch eine gehäusefeste rotationssymmetrische Stegwand (16) gebildet. Die Stegwand (16) ist in Strömungsrichtung (siehe Pfeil) der Spülflüssigkeit gesehen konzentrisch zum Laufrad (6) der Pumpe und vor diesem radial zum Laufradumfang ausgerichtet. Die Stegwand (16) selbst ist ringscheibenförmig gestaltet und kann an einem zumindest annähernd zylindrischen und achsgleich zum Laufrad (6) im Pumpengehäuse (3) angeordneten Einsatz (18) des Pumpengehäuses (3) ausgebildet sein, welcher die Räume (12 bis 14) in ihren Abmessungen begrenzt. Der Einsatz (18) bildet zweckmäßig mit dem Ansaugstutzen (4) am Pumpengehäuse (3) ein Bauteil. Auch kann die Heizungseinrichtung (2) im Pumpengehäuse (3) am Einsatz (18) montiert oder als separat montierbarer Teil des Pumpengehäuses (3) ausgebildet werden.To achieve an optimal pressure build-up in the rotationally symmetrical pump chamber (11), the diffuser space (13) is designed as a ring diffuser. The diffuser space (13) is formed by a housing-fixed rotationally symmetrical web wall (16). The web wall (16) is seen in the flow direction (see arrow) of the rinsing liquid concentric with the impeller (6) of the pump and aligned radially in front of this impeller circumference. The web wall (16) itself is designed annular disk-shaped and can be formed on an at least approximately cylindrical and coaxial with the impeller (6) in the pump housing (3) arranged insert (18) of the pump housing (3), which the spaces (12 to 14) in limited to their dimensions. The insert (18) expediently forms a component with the intake stub (4) on the pump housing (3). Also, the heating device (2) in the pump housing (3) can be mounted on the insert (18) or formed as a separately mountable part of the pump housing (3).

Die Unterteilung der Pumpenkammer (11) in den strömungsintensiven Laufradraum (12) und den strömungsberuhigten Druckraum (14), wobei zwischen diesen beiden Räumen der aus der ringscheibenförmigen Stegwand (16) und den angrenzenden Laufrad-Raumwänden-(Pumpengehäusewand 19) gebildete Diffusorraum (13) angeordnet ist, ist wesentlich für die Wirkungsgradoptimierung der Umwälzpumpe (1). Die Geschwindigkeitsenergie des transportierten Mediums (Spülflüssigkeit), welches aus dem Laufrad (6) in den Diffusorraum (13) strömt, besitzt eine hohe Umfangskomponente. Beim Einströmen in den strömungsberuhigten Druckraum (14) wird ein großer Teil davon in Druckenergie umgewandelt.The subdivision of the pump chamber (11) in the flow-intensive impeller chamber (12) and the flow-calmed pressure chamber (14), between these two spaces from the annular disk-shaped web wall (16) and the adjacent impeller Raumwänden- (pump housing wall 19) formed diffuser space (13) is arranged, is essential for the efficiency optimization of the circulation pump (1). The velocity energy of the transported medium (rinsing liquid), which flows from the impeller (6) into the diffuser space (13), has a high circumferential component. As it flows into the flow-calmed pressure chamber (14) a large part of it is converted into pressure energy.

Da im Gegensatz zu den Kreiselpumpen nach dem Stand der Technik mit Schneckengehäusen (Fig. 1) die Pumpenkammer (11) bzw. das Pumpengehäuse (3) der erfindungsgemäßen Pumpe rotationssymmetrisch ausgeführt ist, herrscht in dem abgeteilten Druckraum (14) überall annähernd konstanter Druck. Daher ist die Position der Auslassstutzen am strömungsberuhigten Druckraum (14) vorteilhaft frei wählbar und somit auch an problemvolle Einbauverhältnisse der Pumpe im Haushaltgerät raumsparend anpassbar. Der rotationssymmetrische strömungsberuhigte Druckraum (14) kann vorteilhaft den ringförmigen Rohrheizkörper (7) aufnehmen.In contrast to the centrifugal pumps of the prior art with screw housings ( Fig. 1 ), the pump chamber (11) or the pump housing (3) of the pump according to the invention is designed rotationally symmetrical, prevails everywhere in the divided pressure chamber (14) approximately constant pressure. Therefore, the position of the outlet on the flow-calmed pressure chamber (14) is advantageously freely selectable and thus also to problematic installation conditions of the pump in the household appliance space-saving adaptable. The rotationally symmetrical flow-calmed pressure chamber (14) can advantageously receive the annular tubular heater (7).

Die Strömungsgeschwindigkeit ist trotz stark reduzierter Umfangskomponente im Druckraum (14) der Heizungseinrichtung (2) einerseits ausreichend zur sicheren Wärmeabfuhr, andererseits aber so niedrig, dass der Pumpenwirkungsgrad nicht durch Wandreibung an den Heizrohren beeinträchtigt wird. Die Rotationssymmetrie bewirkt eine weitestgehend parallele Anströmung der Heizungs-Rohrheizkörper (7) bezüglich ihrer Längsachse. Hierdurch werden Wirbelbildung und Strömungsablösung, die zu lokalen Überhitzungen führen können, vermieden. Deshalb kann ein Verkalken sowie ein Verschmutzen der Heizungseinrichtung (2) in der durchlaufenden Flüssigkeit nahezu ausgeschlossen werden.The flow rate is, despite a greatly reduced peripheral component in the pressure chamber (14) of the heating device (2) on the one hand sufficient for safe heat dissipation, but on the other hand so low that the pump efficiency is not affected by wall friction on the heating tubes. The rotational symmetry causes a largely parallel flow of the heating tube heater (7) with respect to their longitudinal axis. As a result, vortex formation and flow separation, which can lead to local overheating, avoided. Therefore, calcification and fouling of the heater (2) in the passing liquid can be almost eliminated.

Das die Druckstutzen (5, 5') tragende rotationssymmetrische Pumpengehäuse (3) ist pumpenansaugseitig mit dem schon erwähnten Pumpen-Gehäusedeckel (8) verschlossen, welcher den Ansaugstutzen (4) zentrisch umgibt.The pressure nozzle (5, 5 ') supporting rotationally symmetrical pump housing (3) is pumpenansaugseitig with the aforementioned pump housing cover (8) closed, which surrounds the intake manifold (4) centrally.

Es versteht sich, dass der Pumpen-Gehäusedeckel auch nach Fig. 2 mit dem Ansaugstutzen (4) und/oder dem Einsatz (18) für den Ringdiffusor (13) und Druckraum (14) einteilig ausgebildet sein kann. Der Gehäusedeckel und/oder das den Laufradraum (12), Diffusorraum (13) und Druckraum (14) bildende Pumpengehäuse (3) kann dabei aus Metall oder Kunststoff bestehen.It is understood that the pump housing cover also after Fig. 2 with the intake manifold (4) and / or the insert (18) for the ring diffuser (13) and pressure chamber (14) may be integrally formed. The housing cover and / or the impeller chamber (12), diffuser chamber (13) and pressure chamber (14) forming the pump housing (3) may consist of metal or plastic.

Andererseits kann das die Druckstutzen (5, 5') tragende rotationssymmetrische Pumpengehäuse (3) lösbar gemäß Fig. 3 oder fest gemäß Fig. 2 und 4 mit dem Pumpenlagerschild für das Laufrad (6) verbunden werden, wobei das Pumpengehäuse (3) auch einteilig mit dem Pumpenlagerschild vorzugsweise als Kunststoffspritzteil gefertigt sein kann. Nach einer weiteren Ausführungsvariante kann das Pumpengehäuse (3) auch als Metallteil (21) mit integrierten Rohrheizkörpern (7) gemäß Fig. 3 der Heizungseinrichtung (2) ausgebildet werden, wobei der Ansaugstutzen (4) mit dem Pumpendeckel der Umwälzpumpe (1) sowie der Diffusor-Einsatz (18) dann eine Baueinheit (Fig. 3) bilden. Zwischen diesen Teilen ist das separate kreisrunde Pumpengehäuse (3) durch Dichtringe (15) flüssigkeitsdicht gehalten angeordnet.On the other hand, the rotationally symmetrical pump housing (3) carrying the discharge nozzles (5, 5 ') can be released in accordance with Fig. 3 or firmly according to Fig. 2 and 4 be connected to the pump bearing plate for the impeller (6), wherein the pump housing (3) can also be made in one piece with the pump bearing shield preferably as a plastic injection molded part. According to a further embodiment, the pump housing (3) as a metal part (21) with integrated tubular heating elements (7) according to Fig. 3 the heating device (2) are formed, wherein the intake manifold (4) with the pump cover of the circulation pump (1) and the diffuser insert (18) then a structural unit ( Fig. 3 ) form. Between these parts, the separate circular pump housing (3) is held liquid-tight by sealing rings (15).

Außen am Pumpengehäuse (3) sind Sicherheitseinrichtungen, wie Thermoschalter (20), Druckschalter, Trübungssensoren oder dergl. vorzugsweise in Prägungen des Pumpengehäuses (3) und/oder des Pumpen-Gehäusedeckels (8) oder in Prägungen im Metallteil (21) angeordnet.Outside of the pump housing (3) safety devices, such as thermal switches (20), pressure switches, turbidity sensors or the like. Preferably in imprints of the pump housing (3) and / or the pump housing cover (8) or imprints in the metal part (21).

Die Rotationssymmetrie (Kreisform) der Pumpenkammer (11) begünstigt den einfachen modularen Aufbau der Pumpe; insbesondere als vormontierte, separat prüfbare Einheit. Bei Bedarf lassen sich auch mehrere Heizkörper mit unterschiedlichen Heizleistungen in das Pumpengehäuse (3) im Druckraum (14) integrieren.The rotational symmetry (circular shape) of the pump chamber (11) favors the simple modular design of the pump; in particular as a pre-assembled, separately testable unit. If required, several radiators with different heating capacities can also be integrated into the pump housing (3) in the pressure chamber (14).

Claims (19)

  1. Pump, more especially centrifugal pump as circulating pump (1) for water-conducting domestic appliances, such as dishwashers or washing machines, said pump being provided with an electric heating device (2) inside the pump housing (3) for heating the washing water, and where the pump housing (3) is provided with intake connection piece (4) and pressure connection piece (5, 5') and with a radially compressing impeller (6) rotating in the housing for the conveyance of the washing fluid,
    characterised in that the pump housing (3) of the circulating pump (1) is realised with a pump chamber (11), which surrounds the impeller (6) in a rotationally symmetrical manner and is divided into a flow-intensive impeller chamber (12) that accommodates the impeller (6), a diffuser chamber (13) connected downstream of the impeller chamber (12) in which a part of the flow velocity is converted into pressure, and into a flow-calmed pressure chamber (14) connected downstream of said diffuser chamber from which one or more pressure connection pieces (5, 5') branch off and in which the heating device (2) is situated.
  2. Circulating pump according to claim 1, characterised in that the diffuser chamber (13) is in the form of a ring diffuser.
  3. Circulating pump according to claims 1 and 2, characterised in that the diffuser chamber (13) is formed by a rotationally symmetrical web wall (16), which is secured to the housing and is aligned, when viewed in the direction of flow of the washing fluid, concentrically relative to the impeller (6) and in front of said impeller radially relative to the periphery of the impeller.
  4. Circulating pump according to claim 3, characterised in that the web wall (16) is shaped as a ring wheel.
  5. Circulating pump according to one or more of claims 1 to 4, characterised in that the web wall (16) is realised on an insert (18), which is almost cylindrical, is positioned equi-axially relative to the impeller (6) in the pump housing (3) and defines the flow-calmed pressure chamber (14).
  6. Circulating pump according to claim 6, characterised in that the insert (18) preferably with the intake connection piece (4) forms one component on the pump housing (3).
  7. Circulating pump according to one or more of claims 1 to 6, characterised in that the rotationally symmetrical pump housing (3) supporting the pressure connection pieces (5, 5') is closed on the pump intake side by a housing cover, which surrounds the intake connection piece (4) in a central manner.
  8. Circulating pump according to claim 7, characterised in that the housing cover is in one piece with the intake connecting piece (4) and/or the insert (18) for the ring diffuser and pressure chamber (14).
  9. Circulating pump according to claim 7 or 8, characterised in that the housing cover and/or the pump housing (3), forming the impeller chamber (12), diffuser chamber (13) and pressure chamber (14), is produced from metal or plastics material.
  10. Circulating pump according to one or more of claims 1 to 9, characterised in that the rotationally symmetrical pump housing (3), supporting the pressure connection pieces (5, 5'), is connected detachably or fixedly to an end housing for the impeller (6).
  11. Circulating pump according to claim 10, characterised in that the pump housing (3) is realised in one piece with the end housing, preferably as a plastics material injection moulding part.
  12. Circulating pump according to one or more of claims 1 to 11, characterised in that the pump housing (3) is realised as a metal part (21) with integrated tubular heating bodies (7) of the heating device (2).
  13. Circulating pump according to one or more of claims 1 to 12, characterised in that the heating device (2) in the flow-calmed pressure chamber (14) is in the form of a rotationally symmetrical, ring-shaped heating module (tubular heating body (7)).
  14. Circulating pump according to one or more of claims 7 to 13, characterised in that the heating device (2) is detachably secured in the pump housing (3) to the pump housing cover (8) of the circulating pump (1).
  15. Circulating pump according to one or more of claims 5 to 14,
    characterised in that the heating device (2) is mounted on the insert (18) in the pump housing (3).
  16. Circulating pump according to one or more of claims 1 to 15,
    characterised in that the tubular heating body (7) of the heating device (2) is wound once or multiple times in the form of a spiral or in a circumferentially ring-shaped manner, preferably in the manner of a wound cylinder coil.
  17. Circulating pump according to one or more claims 1 to 16, characterised in that the heating device (2) is in the form of a separately mountable part of the pump housing (3).
  18. Circulating pump according to one or more of claims 1 to 17,
    characterised in that safety devices, such as thermal switch (20), pressure switch, turbidity sensors or similar are positioned outside on the pump housing (3) preferably in stampings of the pump housing (3) and/or of the housing cover (8).
  19. Circulating pump according to one or more of claims 1 to 18,
    characterised in that the heating device (2) is mounted at a spacing from the walls of the pump housing (3) on the circulating pump (1).
EP02005593A 2001-04-04 2002-03-12 Pump, in particular centrifugal circulating pump for household appliances using water Expired - Lifetime EP1247993B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10116671 2001-04-04
DE10116671A DE10116671B4 (en) 2001-04-04 2001-04-04 Circulation pump with heating device

Publications (3)

Publication Number Publication Date
EP1247993A2 EP1247993A2 (en) 2002-10-09
EP1247993A3 EP1247993A3 (en) 2003-01-15
EP1247993B1 true EP1247993B1 (en) 2009-03-04

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EP02005593A Expired - Lifetime EP1247993B1 (en) 2001-04-04 2002-03-12 Pump, in particular centrifugal circulating pump for household appliances using water

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EP (1) EP1247993B1 (en)
AT (1) ATE424511T1 (en)
DE (2) DE10116671B4 (en)
ES (1) ES2320417T3 (en)

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US9145901B2 (en) 2011-04-15 2015-09-29 Johnson Electric S.A. Heating pump
US9297553B2 (en) 2013-07-01 2016-03-29 Whirlpool Corporation Pump assembly
US9713413B2 (en) 2013-07-01 2017-07-25 Whirlpool Corporation Dishwasher for treating dishes
DE102017108349A1 (en) 2016-05-23 2017-11-23 Miele & Cie. Kg Washing machine or dishwasher with a heating device for heating the washing or rinsing liquid
US10052010B2 (en) 2013-07-15 2018-08-21 Whirlpool Corporation Dishwasher with sprayer
US10058229B2 (en) 2011-09-22 2018-08-28 Whirlpool Corporation Dishwasher with sprayer
CN108518360A (en) * 2014-04-24 2018-09-11 佛山市顺德区美的洗涤电器制造有限公司 Heat pump and dish-washing machine for dish-washing machine
WO2019041690A1 (en) * 2017-08-31 2019-03-07 广东威灵电机制造有限公司 Fluid pumping device and household electric appliance

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DE102004048362A1 (en) * 2004-03-05 2005-09-22 Aweco Appliance Systems Gmbh & Co. Kg Rotary pump for domestic appliances has an integrated heating element having improved efficiency due to greater contact with the circulated water
EP1650440A1 (en) * 2004-10-20 2006-04-26 Pedrollo S.p.a. Pump casing for centrifugal pump and method for producing said casing
GB2427437B8 (en) * 2005-06-23 2011-08-24 Otter Controls Ltd Combined heater pump apparatus
DE102005043026A1 (en) * 2005-09-09 2007-03-15 BSH Bosch und Siemens Hausgeräte GmbH Water-bearing household appliance with a pump
DE102006028913A1 (en) * 2006-06-21 2007-12-27 Aweco Appliance Systems Gmbh & Co. Kg Pump, in particular for water-bearing household machines
DE102012203715A1 (en) * 2012-03-08 2013-09-12 BSH Bosch und Siemens Hausgeräte GmbH Water-conducting household appliance with at least one motor-driven pump and a heating device
DE102012210554A1 (en) * 2012-06-22 2013-12-24 E.G.O. Elektro-Gerätebau GmbH pump
US9532701B2 (en) 2013-03-01 2017-01-03 Whirlpool Corporation Dishwasher with sprayer
CN104706292B (en) * 2014-01-02 2019-07-05 美的集团股份有限公司 The top spray device of dish-washing machine
DE102014207562A1 (en) * 2014-04-22 2015-10-22 E.G.O. Elektro-Gerätebau GmbH pump
US10602905B2 (en) * 2014-04-24 2020-03-31 Foshan Shunde Midea Washing Appliances Mfg. Co. Lt Heat pump and dishwasher comprising the same
DE102014109625A1 (en) * 2014-07-09 2016-01-14 Hanning Elektro-Werke Gmbh & Co. Kg pump assembly
CN105465050B (en) 2014-08-07 2019-06-11 德昌电机(深圳)有限公司 Heat pump
WO2017101086A1 (en) * 2015-12-17 2017-06-22 广东威灵电机制造有限公司 Centrifugal pump
EP3312429B1 (en) * 2016-10-21 2020-03-04 Miele & Cie. KG Circulating pump for a dish washer
CN113662486B (en) * 2020-05-13 2022-09-20 佛山市威灵洗涤电机制造有限公司 Heating pump and dish washing machine
CN111706520B (en) * 2020-06-19 2021-08-27 佛山市威灵洗涤电机制造有限公司 Shell assembly of electric pump, electric pump and dish washing machine

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9145901B2 (en) 2011-04-15 2015-09-29 Johnson Electric S.A. Heating pump
US10058229B2 (en) 2011-09-22 2018-08-28 Whirlpool Corporation Dishwasher with sprayer
US10602907B2 (en) 2011-09-22 2020-03-31 Whirlpool Corporation Dishwasher with sprayer
US9297553B2 (en) 2013-07-01 2016-03-29 Whirlpool Corporation Pump assembly
US9713413B2 (en) 2013-07-01 2017-07-25 Whirlpool Corporation Dishwasher for treating dishes
US10213085B2 (en) 2013-07-01 2019-02-26 Whirlpool Corporation Dishwasher for treating dishes
US10052010B2 (en) 2013-07-15 2018-08-21 Whirlpool Corporation Dishwasher with sprayer
CN108518360A (en) * 2014-04-24 2018-09-11 佛山市顺德区美的洗涤电器制造有限公司 Heat pump and dish-washing machine for dish-washing machine
DE102017108349A1 (en) 2016-05-23 2017-11-23 Miele & Cie. Kg Washing machine or dishwasher with a heating device for heating the washing or rinsing liquid
DE102017108349B4 (en) 2016-05-23 2023-03-09 Miele & Cie. Kg Washing machine or dishwasher with a heating device for heating the washing or rinsing liquid
WO2019041690A1 (en) * 2017-08-31 2019-03-07 广东威灵电机制造有限公司 Fluid pumping device and household electric appliance

Also Published As

Publication number Publication date
EP1247993A2 (en) 2002-10-09
ES2320417T3 (en) 2009-05-22
EP1247993A3 (en) 2003-01-15
ATE424511T1 (en) 2009-03-15
DE50213324D1 (en) 2009-04-16
DE10116671A1 (en) 2002-10-17
DE10116671B4 (en) 2006-04-27

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