EP1126180B1 - Impeller for a centrifugal dish washer pump - Google Patents

Impeller for a centrifugal dish washer pump Download PDF

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Publication number
EP1126180B1
EP1126180B1 EP00126832A EP00126832A EP1126180B1 EP 1126180 B1 EP1126180 B1 EP 1126180B1 EP 00126832 A EP00126832 A EP 00126832A EP 00126832 A EP00126832 A EP 00126832A EP 1126180 B1 EP1126180 B1 EP 1126180B1
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EP
European Patent Office
Prior art keywords
impeller
pump
vane
covering
wheel
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EP00126832A
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German (de)
French (fr)
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EP1126180A2 (en
EP1126180A3 (en
Inventor
Walter Assmann
Hans Joachim Hegemann
Ulrich Hettenhausen
Peter Dr. Rode
Hermann-Josef Theis
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Miele und Cie KG
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Miele und Cie KG
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Publication of EP1126180A3 publication Critical patent/EP1126180A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly

Definitions

  • the object of the invention relates to a centrifugal pump, in particular circulating pump for Use in dishwashers or washing machines, with a pump impeller, which in a counter-stored in a provided with suction and discharge nozzle pump housing rotates and formed with a plurality of blades and with an abutment ring of a mechanical seal is, with the blades from the wheel hub to the wheel circumference of the wheel extend radially and on an upstream front blade cover and a Pump housing side rear blade cover are arranged.
  • centrifugal pumps radial design for water-bearing appliances especially for Dishwashers whose impellers are on the pump housing side or upstream
  • So are open at the rear or front, for example, from US-A-3,354,529.
  • closed Wheels known, sh. for example DE 198 01 112 A1 or DE 37 06 770 OS, where the rear wheel cover the blades completely and the front cover the blades cover up to the suction-side inflow cross section.
  • the open Impellers have the advantage that they are easier to manufacture.
  • the open wheels are distinguished compared to the closed wheels by a poorer hydraulic Efficiency, because by pressure differences between the front blade and Rear of the blade considerable gap losses occur.
  • the invention is based on the object, a centrifugal pump with a pump impeller to create, which is easy and inexpensive to manufacture, through a stable pump performance also distinguished in axial position tolerances, and in the disturbing running noise and Bleed problems are eliminated.
  • FIG. 1 A in Fig. 1 with (1) designated pump impeller for a known per se and not shown in detail Centrifugal pump, especially for one in dishwashers or washing machines usable circulating pump according to the invention as the front and rear each semi-open impeller educated.
  • Such an impeller (1) can in a provided with suction and discharge nozzle pump housing, as shown for example in DE 198 01 112 A1, are used.
  • the Pump shaft seal in a conventional manner by means of a mechanical seal, consisting from a arranged in the motor-side shield of the pump housing rubber sleeve with fixed sliding ring made of sintered carbon material or the like.
  • an abutment ring (2) made of ceramic material on the impeller (1).
  • the sliding ring is supported by spring pressure on the perpendicular to the shaft sealing surface of the ceramic counter-bearing ring (2).
  • the impeller (1) (Fig. 1 to 3) is provided with a plurality of blades (3), which differs from the Impeller hub (4) extend radially to the impeller outer circumference and between blade covers (5, 6) of the impeller (1) are arranged.
  • the impeller (1) with the blade covers (5, 6) is inventively in one piece, preferably made in one piece, wherein the initially mentioned semi-open design is selected. After this construction cover both sides the rotor blades (3) provided blade covers (5, 6) the blades (3) front and back only partially off.
  • the one-piece impeller (1) is designed as an injection molded part, wherein the ceramic counter-bearing ring (2) is preferably cast with.
  • the ceramic counter-bearing ring (2) is preferably cast with.
  • the ceramic counter-bearing ring (2) with a in the impeller material provided immersion gradation (7) and positively and / or non-positively in the impeller (1) fixed.
  • the gradation (7) is encapsulated by the impeller material.
  • the blades (3) end on the front blade cover (5) and concealed by this in the upper area on one Bucket outer circle diameter (A'-5).
  • the blade outer circle diameter (A'-5) is preferable smaller than the outer diameter (A-5) of the annular front blade cover (5) elected.
  • the outer diameter (A-6) of the rear blade cover (6) or the approximately equal inner diameter (I-5) of the front blade cover (5) lies approximately in the middle between the outer diameter (A-5) of the front blade cover (5) and the blade inner circle diameter (I'-6) the rear cover (6).
  • the above-described shaping of the invention in an injection completely produced semi-open pump impeller (1) has the advantage that axial position tolerances of the impeller (1) can not affect the output power of the pump. Becomes assumed from the fact that the width of a leakage water gap between the open Buckets and the adjacent pump housing walls, not shown, the pump capacity influenced, so a negative influence does not occur because when moving of both sides semi-open impeller (1) on the one side enlarging Leakage water gap on the opposite side in the open blade area accordingly reduced. At the selected diameter ratios of the blade covers (5, 6) the effects (pressure distributions, etc.) cancel each other out, so that the pump performance at least constant. Experiments have shown that compared to the known, closed Impellers (DE 198 01 112 A1) even efficiency improvements occur.
  • the impeller (1) promotes water / air mixtures or foam compared to known Klaufrädem with less disturbing noises, d. H. relatively quiet. This is achieved through the large bladed hub, because it sucked air bubbles on the inflow side Do not inject straight into the rear bucket cover and make noise on impact generate, but in the region of the impeller hub (4) deflected by the blades (3) and be crushed by the blades. This process takes place inside the impeller (1) instead of and is thus acoustically largely decoupled.
  • Impellers are the volumes of shovel-free annular clearance between the impeller hub (4) and the initially mentioned pump housing or the front impeller cover (5) and the pump housing is reduced to less than half. By reducing the size of the annular space thus less air accumulates, so that bleeding the pump less is hampered.
  • the impeller (1) can be made in one piece, because the outer diameter (A-6) of the rear wheel cover (6) equal to or slightly smaller than the inside diameter (I-5) of the front cover (5). If the counter ring bearing ceramic (2) is inserted into the impeller injection molding tool, this eliminates the separate mounting of the bearing. The complete impeller (1) can in one Operation are made. Likewise, the direct injection molded bearing ceramic reduces the number of components achieved, as a sealing sleeve and a separately used brass bushing can be omitted for receiving the ceramic disc. Direct injection of the ceramic counter bearing ring (2) is of course also applicable in a multi-part impeller.

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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 impeller comprises impeller blades(3) extending radially from the hub towards the periphery, and installed on a front shroud on the inlet side and/or rear shroud on the pump casing side. The impeller is constructed semi-shrouded, and manufactured as an injection moulded part with a cast-in ceramic support bearing ring(2). The shrouds overlap the impeller blades on the front and rear sides only partially, with the front shroud(5) being in ring form, and the rear shroud(6) as a closed disc with an external diameter the same or smaller than the internal diameter of the front shroud.

Description

Der Gegenstand der Erfindung betrifft eine Kreiselpumpe, insbesondere Umwälzpumpe zum Einsatz in Geschirrspülmaschinen oder Waschmaschinen, mit einem Pumpenlaufrad, welches in einem mit Ansaug- und Druckstutzen versehenen Pumpengehäuse gegengelagert umläuft und mit mehreren Laufschaufeln sowie mit einem Gegenlagerring einer Gleitringdichtung ausgebildet ist, wobei sich die Laufschaufeln von der Radnabe zum Radumfang des Laufrades radial erstrecken und an einer anströmseitigen vorderen Laufschaufelabdeckung und einer pumpengehäuseseitigen hinteren Laufschaufelabdeckung angeordnet sind.The object of the invention relates to a centrifugal pump, in particular circulating pump for Use in dishwashers or washing machines, with a pump impeller, which in a counter-stored in a provided with suction and discharge nozzle pump housing rotates and formed with a plurality of blades and with an abutment ring of a mechanical seal is, with the blades from the wheel hub to the wheel circumference of the wheel extend radially and on an upstream front blade cover and a Pump housing side rear blade cover are arranged.

Es sind Kreiselpumpen radialer Bauart für wasserführende Haushaltgeräte, insbesondere für Geschirrspülmaschinen bekannt, deren Laufräder pumpengehäuseseitig oder anströmseitig, also hinten oder vorn offen sind, beispielsweise aus der US-A-3 354 529 . Ebenso sind geschlossene Laufräder bekannt, sh. beispielsweise DE 198 01 112 A1 oder DE 37 06 770 OS, bei denen die hintere Laufradabdeckung die Laufschaufeln vollständig und die vordere Abdeckung die Laufschaufeln bis auf den saugseitigen Einströmquerschnitt abdeckt. Die offenen Laufräder haben den Vorteil, dass sie einfacher zu fertigen sind. Ferner sind die Schaufelkanäle der offenen Laufräder, falls notwendig, nachträglich gut zu bearbeiten oder für Inspektionszwecke auch gut einsehbar. Demgegenüber zeichnen sich die offenen Laufräder gegenüber den geschlossenen Laufrädern durch einen schlechteren hydraulischen Wirkungsgrad aus, weil durch Druckdifferenzen zwischen Schaufelvorderseite und Schaufelrückseite erhebliche Spaltverluste entstehen.There are centrifugal pumps radial design for water-bearing appliances, especially for Dishwashers whose impellers are on the pump housing side or upstream, So are open at the rear or front, for example, from US-A-3,354,529. Likewise are closed Wheels known, sh. for example DE 198 01 112 A1 or DE 37 06 770 OS, where the rear wheel cover the blades completely and the front cover the blades cover up to the suction-side inflow cross section. The open Impellers have the advantage that they are easier to manufacture. Furthermore, the blade channels the open wheels, if necessary, subsequently to edit well or for Inspection purposes also well visible. In contrast, the open wheels are distinguished compared to the closed wheels by a poorer hydraulic Efficiency, because by pressure differences between the front blade and Rear of the blade considerable gap losses occur.

Im Vergleich hierzu weist ein geschlossenes Laufrad weniger Spaltverluste auf, da hinreichend ähnliche Druckverteilungen auf beiden Seiten des Laufrades vorliegen. Jedoch verändern auch hier axiale Lagetoleranzen des Laufrades die Leistungsabgabe erheblich, so dass Abhilfe zu schaffen ist. Ferner ist es beim bekannten Technikstand als nachteilig zu sehen, dass erhebliche Laufgeräusche der Pumpe bei Schaumbildung in der geförderten Flüssigkeit auftreten können, die als störend wahrgenommen werden. Auch Wirkungsgradverschlechterungen durch ungenügende Laufradentlüftungen können auftreten.In comparison, a closed impeller has less gap losses, since sufficient similar pressure distributions are present on both sides of the impeller. However, change too here axial position tolerances of the impeller the power output considerably, so remedy too create is. Furthermore, it is disadvantageous in the prior art that substantial Running noise of the pump when foaming in the pumped liquid occur can be perceived as disturbing. Also efficiency deterioration by insufficient impeller vents may occur.

Um ferner bei offenen und geschlossenen Pumpenlaufrädern eine präzise Abdichtung nach außen hin zu erreichen, sind Gleitringdichtungen für die umlaufenden Pumpenwellen bekannt, wofür in einem dem Pumpenlaufrad rückseitig zugekehrten Lagerschild des Pumpengehäuses ein Gummibalg eingesetzt ist, an welchem ein axial dichtender Gleitring aus gesintertem Kohlewerkstoff oder dergl. anvulkanisiert oder auf andere Weise befestigt ist. Der Gleitring stützt sich unter Federdruck an einer senkrecht zur Welle stehende Dichtfläche eines aus Keramikmaterial gefertigten Gegenlagerringes ab, der in einer separat eingesetzten Messingbuchse oder dergl. des Pumpenlaufrades unter Zwischenlage einer Gummimanschette eingepresst ist. Die Aufnahme für den Gegenlagerring im Pumpenlaufrad muss dabei sehr genau gearbeitet sein, weil der Gegenlagerring erheblichen Schwingungs- und Wärmebelastungen ausgesetzt ist, die zu Undichtheiten der Dichtung führen können. Nachteilig ist der Gegenlagerring samt seinen ihn aufnehmenden Lagerteilen zeitraubend in separaten zusätzlichen Montagegängen mit dem Pumpenlaufrad zu verbinden. Auch hier soll die Erfindung Abhilfe schaffen.Furthermore, with open and closed pump impellers, precise sealing is required To reach the outside, mechanical seals for the rotating pump shafts are known, what for in a the pump impeller back facing bearing plate of the pump housing a rubber bellows is used, on which an axially sealing sliding ring made of sintered carbon material or the like vulcanized or otherwise secured. The sliding ring is supported under spring pressure on a standing perpendicular to the shaft sealing surface of a ceramic material manufactured counter bearing ring, which in a separately inserted brass bushing or the like. of the pump impeller with the interposition of a rubber sleeve is pressed. The recording for the counter-bearing ring in the pump impeller must be worked very carefully because the counter bearing ring is exposed to significant vibration and heat loads, the Leaks in the seal can lead. The disadvantage of the counter bearing ring together with his him receiving bearing parts time consuming in separate additional assembly operations with the Pump impeller to connect. Again, the invention is intended to remedy this.

Aus der US-A-3 079 866 ist ein halboffenes Pumpenlaufrad bekannt. Bei diesem Laufrad ist die vordere, ansaugseitige Laufschaufelabdeckung trichterförmig gebogen ausgebildet, so dass zwischen dem inneren Rand der Abdeckung und dem Pumpengehäuse ein axial gerichteter Spalt entsteht.From US-A-3 079 866 a semi-open pump impeller is known. This impeller is the front, suction-side blade cover formed funnel-shaped curved, so that between the inner edge of the cover and the pump housing an axially directed Gap arises.

Der Erfindung liegt die Aufgabe zugrunde, eine Kreiselpumpe mit einem Pumpenlaufrad zu schaffen, das einfach sowie kostengünstig zu fertigen ist, sich durch eine stabile Pumpenleistung auch bei axialen Lagetoleranzen auszeichnet, und bei dem störende Laufgeräusche und Entlüftungsprobleme beseitigt sind.The invention is based on the object, a centrifugal pump with a pump impeller to create, which is easy and inexpensive to manufacture, through a stable pump performance also distinguished in axial position tolerances, and in the disturbing running noise and Bleed problems are eliminated.

Ausgehend von einer Kreiselpumpe der eingangs genannten Art wird diese Aufgabe erfindungsgemäß durch die im Patentanspruch 1 angegebenen Merkmale gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.Starting from a centrifugal pump of the type mentioned, this object is achieved according to the invention solved by the features specified in claim 1. Advantageous embodiments and further developments of the invention will become apparent from the following subclaims.

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

Figur 1
ein Pumpenlaufrad einer Kreiselpumpe in der Vorderansicht (Anströmseite),
Figur 2
das Pumpenlaufrad in der Seitenansicht im Längsschnitt,
Fig. 3
das Pumpenlaufrad in der Rückansicht.
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 pump impeller of a centrifugal pump in the front view (upstream side),
FIG. 2
the pump impeller in the side view in longitudinal section,
Fig. 3
the pump impeller in the rear view.

Ein in Fig. 1 mit (1) bezeichnetes Pumpenlaufrad für eine an sich bekannte und nicht näher gezeigte Kreiselpumpe, insbesondere für eine in Geschirrspülmaschinen oder Waschmaschinen einsetzbare Umwälzpumpe ist erfindungsgemäß als vorne und hinten jeweils halboffenes Laufrad ausgebildet. A in Fig. 1 with (1) designated pump impeller for a known per se and not shown in detail Centrifugal pump, especially for one in dishwashers or washing machines usable circulating pump according to the invention as the front and rear each semi-open impeller educated.

Ein solches Laufrad (1) kann in einem mit Ansaug- und Druckstutzen versehenen Pumpengehäuse, wie beispielsweise in DE 198 01 112 A1 gezeigt, eingesetzt werden. Dabei erfolgt die Pumpenwellenabdichtung in an sich bekannter Weise mittels einer Gleitringdichtung, bestehend aus einer im motorseitigen Lagerschild des Pumpengehäuses angeordneten Gummimanschette mit festgesetztem Gleitring aus gesintertem Kohlewerkstoff oder dergl. und einem Gegenlagerring (2) aus Keramikmaterial am Laufrad (1). Der Gleitring stützt sich unter Federdruck an der senkrecht zur Welle stehenden Dichtfläche des Keramik- Gegenlagerringes (2) ab. Such an impeller (1) can in a provided with suction and discharge nozzle pump housing, as shown for example in DE 198 01 112 A1, are used. In doing so, the Pump shaft seal in a conventional manner by means of a mechanical seal, consisting from a arranged in the motor-side shield of the pump housing rubber sleeve with fixed sliding ring made of sintered carbon material or the like. And an abutment ring (2) made of ceramic material on the impeller (1). The sliding ring is supported by spring pressure on the perpendicular to the shaft sealing surface of the ceramic counter-bearing ring (2).

Das Laufrad (1) (Fig. 1 bis 3) ist mit mehreren Laufschaufeln (3) versehen, welche sich von der Laufradnabe (4) zum Laufradaußenumfang hin radial erstrecken und zwischen Laufschaufelabdeckungen (5, 6) des Laufrades (1) angeordnet sind. Das Laufrad (1) mit den Laufschaufelabdeckungen (5, 6) ist erfindungsgemäß einteilig, vorzugsweise einstückig gefertigt, wobei die anfangs erwähnte halboffene Bauweise gewählt ist. Nach dieser Bauweise decken die beiderseits der Laufschaufeln (3) vorgesehenen Laufschaufelabdeckungen (5, 6) die Laufschaufeln (3) vorder- und rückseitig nur teilweise ab.The impeller (1) (Fig. 1 to 3) is provided with a plurality of blades (3), which differs from the Impeller hub (4) extend radially to the impeller outer circumference and between blade covers (5, 6) of the impeller (1) are arranged. The impeller (1) with the blade covers (5, 6) is inventively in one piece, preferably made in one piece, wherein the initially mentioned semi-open design is selected. After this construction cover both sides the rotor blades (3) provided blade covers (5, 6) the blades (3) front and back only partially off.

Das einteilige Laufrad (1) ist als Spritzgußteil ausgebildet, wobei der Keramik-Gegenlagerring (2) vorzugsweise mit eingegossen ist. Gemäß dem gezeigten Ausführungsbeispiel (sh. insbesondere Fig. 2) ist der Keramik-Gegenlagerring (2) dafür mit einer in das Laufradmaterial eintauchenden Abstufung (7) versehen und form- und/oder kraftschlüssig im Laufrad (1) festgesetzt. Dabei ist die Abstufung (7) vom Laufradmaterial umgossen.The one-piece impeller (1) is designed as an injection molded part, wherein the ceramic counter-bearing ring (2) is preferably cast with. According to the embodiment shown (see. In particular Fig. 2) is the ceramic counter-bearing ring (2) with a in the impeller material provided immersion gradation (7) and positively and / or non-positively in the impeller (1) fixed. The gradation (7) is encapsulated by the impeller material.

Zur Herstellung des Kunststoff-Laufrades (1) genügt ein Spritzgusswerkzeug in einfacher zweiteiliger Schieber-Bauart. Dies gelingt bei dem erfindungsgemäß halboffenen Laufrad (1) dadurch, dass die vordere oder anströmseitige Laufschaufelabdeckung (5) kreisringförmig und die hintere den Gegenlagerring (2) tragende Laufschaufelabdeckung (6) als geschlossene Scheibe mit einem Außendurchmesser (A-6) ausgebildet ist, der gleich oder kleiner als der Innendurchmesser (I-5) der vorderen Laufschaufelabdeckung (5) ist. Dabei beginnen die an der hinteren Laufschaufelabdeckung (6) angeformten Laufschaufeln (3) an der Laufradnabe (4) mit dem Keramik-Gegenlagerring (2) auf einem frei im Ansaugbereich (S) des Laufrades (1) liegenden Schaufel-Innenkreisdurchmesser (1'-6) und bleiben unabgedeckt bis zum Innendurchmesser (I-5) der vorderen Laufschaufelabdeckung (5). Die Laufschaufeln (3) enden auf der vorderen Laufschaufelabdeckung (5) und von dieser im oberen Bereich verdeckt auf einem Schaufel-Außenkreisdurchmesser (A'-5). Der Schaufel-Außenkreisdurchmesser (A'-5) ist vorzugsweise kleiner als der Außendurchmesser (A-5) der kreisringförmigen vorderen Laufschaufelabdeckung (5) gewählt. Der Außendurchmesser (A-6) der hinteren Laufschaufelabdeckung (6) bzw. der annähernd gleich große Innendurchmesser (I-5) der vorderen Laufschaufelabdeckung (5) liegt dabei annähernd in der Mitte zwischen dem Außendurchmesser (A-5) der vorderen Laufschaufelabdeckung (5) und dem Schaufel-Innenkreisdurchmesser (I'-6) der hinteren Abdeckung (6). Somit ist die Entformung eines zweiteiligen Spritzwerkzeuges einfach möglich.For the production of the plastic impeller (1) an injection molding tool in a simple two-part suffices Vane type. This is achieved with the half-open impeller (1) according to the invention, in that the front or upstream blade cover (5) is annular and the rear rotor blade cover (6) carrying the counter bearing ring (2) as a closed disk is formed with an outer diameter (A-6) equal to or smaller than the inner diameter (I-5) of the front blade cover (5). This starts at the rear Blade cover (6) integrally formed blades (3) on the impeller hub (4) with the Ceramic counter-bearing ring (2) on a free in the intake (S) of the impeller (1) lying Vane inner circle diameter (1'-6) and remain uncovered to the inside diameter (I-5) of the front blade cover (5). The blades (3) end on the front blade cover (5) and concealed by this in the upper area on one Bucket outer circle diameter (A'-5). The blade outer circle diameter (A'-5) is preferable smaller than the outer diameter (A-5) of the annular front blade cover (5) elected. The outer diameter (A-6) of the rear blade cover (6) or the approximately equal inner diameter (I-5) of the front blade cover (5) lies approximately in the middle between the outer diameter (A-5) of the front blade cover (5) and the blade inner circle diameter (I'-6) the rear cover (6). Thus, the demolding of a two-part injection molding tool is easy possible.

Die vorbeschriebene erfindungsgemäße Formgebung des in einem Spritzvorgang komplett zu fertigenden halboffenen Pumpenlaufrades (1) erzielt den Vorteil, dass sich axiale Lagetoleranzen des Laufrades (1) nicht auf die abgegebene Pumpenleistung auswirken können. Wird von der Tatsache ausgegangen, dass die Breite eines Leckwasserspaltes zwischen den offenen Schaufeln und den benachbarten nicht gezeigten Pumpengehäusewandungen die Pumpenleistung beeinflusst, so tritt eine negative Beeinflussung deshalb nicht auf, weil beim Verschieben des beidseitig halboffenen Laufrades (1) der sich auf der einen Seite vergrößernde Leckwasserspalt auf der gegenüber liegenden Seite im offenen Schaufelbereich entsprechend verkleinert. Bei den gewählten Durchmesserverhältnissen der Laufschaufelabdeckungen(5, 6) heben sich die Effekte (Druckverteilungen usw.) gegenseitig auf, so dass die Pumpenleistung zumindest konstant bleibt. In Versuchen hat sich gezeigt, dass gegenüber den bekannten, geschlossenen Laufrädern (DE 198 01 112 A1) sogar Wirkungsgradverbesserungen auftreten.The above-described shaping of the invention in an injection completely produced semi-open pump impeller (1) has the advantage that axial position tolerances of the impeller (1) can not affect the output power of the pump. Becomes assumed from the fact that the width of a leakage water gap between the open Buckets and the adjacent pump housing walls, not shown, the pump capacity influenced, so a negative influence does not occur because when moving of both sides semi-open impeller (1) on the one side enlarging Leakage water gap on the opposite side in the open blade area accordingly reduced. At the selected diameter ratios of the blade covers (5, 6) the effects (pressure distributions, etc.) cancel each other out, so that the pump performance at least constant. Experiments have shown that compared to the known, closed Impellers (DE 198 01 112 A1) even efficiency improvements occur.

Darüber hinaus fördert das Laufrad (1) Wasser/Luftgemische bzw. Schaum im Vergleich zu bekannten Klaufrädem mit weniger störenden Geräuschen, d. h. relativ leise. Erreicht wird dies durch die große beschaufelte Radnabe, weil dadurch anströmseitig angesaugte Luftblasen nicht direkt geradlinig auf die hintere Schaufelabdeckung einschießen und beim Aufprall Geräusche erzeugen, sondern im Bereich der Laufradnabe (4) von den Laufschaufeln (3) umgelenkt und durch die Schaufeln zerkleinert werden. Dieser Vorgang findet innerhalb des Laufrades (1) statt und ist damit akustisch weitgehend entkoppelt.In addition, the impeller (1) promotes water / air mixtures or foam compared to known Klaufrädem with less disturbing noises, d. H. relatively quiet. This is achieved through the large bladed hub, because it sucked air bubbles on the inflow side Do not inject straight into the rear bucket cover and make noise on impact generate, but in the region of the impeller hub (4) deflected by the blades (3) and be crushed by the blades. This process takes place inside the impeller (1) instead of and is thus acoustically largely decoupled.

Ebenso entlüftet das halboffene Laufrad (1) vorteilhaft, denn im Vergleich zu geschlossenen Laufrädern sind die Volumina der schaufellosen Ringspalträume zwischen der Laufradnabe (4) und dem anfangs erwähnten Pumpengehäuse bzw. der vorderen Laufradabdeckung (5) und dem Pumpengehäuse auf weniger als die Hälfte reduziert. Durch die Verkleinerung der Ringspalträume sammelt sich somit weniger Luft an, so dass ein Entlüften der Pumpe weniger stark behindert ist.Likewise vented the semi-open impeller (1) advantageous, because compared to closed Impellers are the volumes of shovel-free annular clearance between the impeller hub (4) and the initially mentioned pump housing or the front impeller cover (5) and the pump housing is reduced to less than half. By reducing the size of the annular space thus less air accumulates, so that bleeding the pump less is hampered.

Das Laufrad (1) läßt sich einteilig fertigen, weil der Außendurchmesser (A-6) der hinteren Laufradabdeckung (6) gleich oder etwas kleiner als der Innendurchmesser (I-5) der vorderen Abdeckung (5) ist. Wird die Gegenring-Lagerkeramik (2) mit in das Laufrad-Spritzwerkzeug eingesetzt, so entfällt das separate Montieren des Lagers. Das komplette Laufrad (1) kann in einem Arbeitsgang gefertigt werden. Ebenfalls wird durch die direktumspritzte Lagerkeramik eine Bauteilereduzierung erreicht, da eine Dichtmanschette und eine separat einzusetzende Messingbuchse für die Aufnahme der Keramikscheibe entfallen können. Das Direkteinspritzen des Keramik-Gegenlagerringes (2) ist selbstverständlich auch anwendbar in einem mehrteiligen Laufrad.The impeller (1) can be made in one piece, because the outer diameter (A-6) of the rear wheel cover (6) equal to or slightly smaller than the inside diameter (I-5) of the front cover (5). If the counter ring bearing ceramic (2) is inserted into the impeller injection molding tool, this eliminates the separate mounting of the bearing. The complete impeller (1) can in one Operation are made. Likewise, the direct injection molded bearing ceramic reduces the number of components achieved, as a sealing sleeve and a separately used brass bushing can be omitted for receiving the ceramic disc. Direct injection of the ceramic counter bearing ring (2) is of course also applicable in a multi-part impeller.

Claims (6)

  1. Centrifugal pump, more especially a circulating pump for use in dishwashing machines or washing machines, said pump having a pump impeller wheel (1), which rotates in a supported manner in a pump housing provided with suction and pressure pipes and is provided with a plurality of impeller vanes (3) as well as with a supporting ring (2) of a sliding ring seal, the impeller vanes (3) extending radially from the wheel hub (4) to the wheel circumference of the impeller wheel (1) and being disposed on a front impeller vane covering (5) on the inflow side and a rear impeller vane covering (6) on the pump housing side, characterised in that the impeller wheel (1) with the impeller vane coverings (5, 6) is configured to be half-open, so that the impeller vane coverings (5, 6) only partially cover the impeller vanes (3) on the front side and on the rear side, the front impeller vane covering (5) being configured in a circular manner, and the rear impeller vane covering (6) being in the form of a closed disc with an external diameter (A-6), which is equal to or smaller than the internal diameter (I-5) of the front impeller vane covering (5).
  2. Centrifugal pump having a pump impeller wheel according to claim 1, characterised in that the impeller wheel (1) is manufactured as a one-piece injection-moulded part, possibly with a ceramic supporting ring (2) incorporated therein.
  3. Centrifugal pump having a pump impeller wheel according to one of claims 1 or 2, characterised in that the impeller vanes (3), connected to the rear impeller vane covering (6), begin before the impeller wheel hub (4) on an internal vane diameter (I'-6) and end on the front impeller vane covering (5) on an external vane diameter (A'-5), which is preferably selected to be smaller than the external diameter (A-5) of the circular front impeller vane covering (5).
  4. Centrifugal pump having a pump impeller wheel according to one or more of claims 1 to 3, characterised in that the external diameter (A-6) of the rear impeller vane covering (6), or respectively the approximately equally large internal diameter (1-5) of the front impeller vane covering (5), lies preferably in the centre between the external diameter (A-5) of the impeller vane covering (5) on the inflow side and the internal vane diameter (I'-6).
  5. Centrifugal pump having a pump impeller wheel according to one or more of claims 1 to 4, characterised in that the ceramic supporting ring (2) is secured in the impeller wheel (1) in a form-fitting manner and/or in a force-fitting manner.
  6. Centrifugal pump having a pump impeller wheel according to one or more of claims 1 to 5, characterised in that the ceramic supporting ring (2) is provided with a stepped portion (7), which is surrounded by the impeller wheel material.
EP00126832A 2000-02-16 2000-12-07 Impeller for a centrifugal dish washer pump Expired - Lifetime EP1126180B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10006983 2000-02-16
DE10006983A DE10006983A1 (en) 2000-02-16 2000-02-16 Pump impeller for a centrifugal pump, in particular for a circulation pump that can be used in dishwashers or washing machines

Publications (3)

Publication Number Publication Date
EP1126180A2 EP1126180A2 (en) 2001-08-22
EP1126180A3 EP1126180A3 (en) 2002-08-14
EP1126180B1 true EP1126180B1 (en) 2005-03-02

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ID=7631148

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Application Number Title Priority Date Filing Date
EP00126832A Expired - Lifetime EP1126180B1 (en) 2000-02-16 2000-12-07 Impeller for a centrifugal dish washer pump

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EP (1) EP1126180B1 (en)
AT (1) ATE290169T1 (en)
DE (2) DE10006983A1 (en)
ES (1) ES2234504T3 (en)

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US7047914B2 (en) 2001-02-15 2006-05-23 Litens Automotive Internal combustion engine combination with direct camshaft driven coolant pump
CA2492764C (en) * 2002-08-13 2012-09-18 Litens Automotive Internal combustion engine combination with direct camshaft driven coolant pump
DE102005031589A1 (en) * 2005-07-06 2007-01-11 Schaeffler Kg Wasserpumpenflügelrad
WO2011148396A1 (en) * 2010-05-28 2011-12-01 Coplast Srl Cooling fan for a rotary machine technical field of application of the invention
WO2011148397A1 (en) * 2010-05-28 2011-12-01 Coplast Srl Cooling fan for a rotary machine
WO2011148398A1 (en) * 2010-05-28 2011-12-01 Coplast Srl Cooling fan for a rotary machine
CN102562650A (en) * 2010-12-08 2012-07-11 湖北省天门泵业有限公司 Semi-closed impeller of pump
ITPD20100386A1 (en) * 2010-12-21 2012-06-22 Unox Spa FAN PERFECTED OF CENTRIFUGAL FAN, IN PARTICULAR INTENDED FOR COOKING OVENS OF THE CONVECTION TYPE AND METHOD OF MANUFACTURE OF SUCH FAN
CN104141632B (en) * 2014-07-25 2016-04-06 吉首长潭泵业有限公司 Abrasion resistance alloy mortar pump impeller and manufacture method thereof
CN105275834B (en) * 2015-10-27 2018-05-11 上海华鼓鼓风机有限公司 A kind of three-dimensional flow centrifugal blower of low speed multi-level vertical subdivision cylindrical structure
US10349809B2 (en) 2017-08-08 2019-07-16 Haier Us Appliance Solutions, Inc. Pump assembly for a dishwashing appliance
US10349810B2 (en) 2017-08-08 2019-07-16 Haier Us Appliance Solutions, Inc. Pump assembly for a dishwashing appliance

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Also Published As

Publication number Publication date
ATE290169T1 (en) 2005-03-15
DE10006983A1 (en) 2001-08-23
DE50009642D1 (en) 2005-04-07
EP1126180A2 (en) 2001-08-22
EP1126180A3 (en) 2002-08-14
ES2234504T3 (en) 2005-07-01

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