EP0338484A2 - Liquid accumulator emptying device for water running household appliances - Google Patents

Liquid accumulator emptying device for water running household appliances Download PDF

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Publication number
EP0338484A2
EP0338484A2 EP89106861A EP89106861A EP0338484A2 EP 0338484 A2 EP0338484 A2 EP 0338484A2 EP 89106861 A EP89106861 A EP 89106861A EP 89106861 A EP89106861 A EP 89106861A EP 0338484 A2 EP0338484 A2 EP 0338484A2
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EP
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Prior art keywords
pump
liquid
area
pressure
centrifugal pump
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Granted
Application number
EP89106861A
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German (de)
French (fr)
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EP0338484A3 (en
EP0338484B1 (en
Inventor
Hans Haverkamp
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Hanning Elektro Werke GmbH and Co KG
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Hanning Elektro Werke GmbH and Co KG
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Publication of EP0338484A3 publication Critical patent/EP0338484A3/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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Definitions

  • the invention relates to a device for emptying a liquid collecting container of water-bearing household appliances, consisting of a centrifugal pump with a pump housing enclosing a floating pump impeller, which has an axial suction nozzle and a radial pressure nozzle, of which the suction nozzle with the optionally has a piece of hose attached to it Liquid collecting container is connected, and the pressure port is used to discharge the liquid delivered by the centrifugal pump.
  • centrifugal pumps used in such devices are consistently low-power pumps which are usually driven by shaded-pole motors and which are insensitive to Ver in their construction dirt, fluff, impurities and foreign bodies. Since the general efforts now also in household appliances to offer machines that are as quiet as possible, the drainage pump has been included in this process of minimizing noise. Through refined storage technology and electrical and magnetic motor design, it has now been possible to build such pumps so quietly that they have the desired running behavior during the normal pumping process.
  • noise condition that is only present after the liquid collecting container has been emptied is still a hindrance and is referred to in specialist circles as "snorkeling noise". This periodically occurring noise is louder than the other machine noises and, above all, very unpleasant because it alternately swells and swells, which is perceived as particularly annoying.
  • the return channel connecting the pressure side with the suction side of the centrifugal pump according to the invention ensures that a liquid circuit is formed in the pump housing after the collection container has been emptied, which now avoids the pressure fluctuations and periodic oscillations which previously occurred.
  • the simultaneously occurring, but only very small, reduction in the delivery rate of the pump is negligibly small in practice and is far outweighed by the advantage of noise reduction achieved.
  • the water-carrying domestic appliance 1 shown therein has a liquid collecting container 2, for the emptying of which a centrifugal pump 3 is provided at regular intervals.
  • This centrifugal pump 3 has a pump housing 4, which surrounds a pump wheel 6, which is overhung and is driven by an electric motor 5.
  • the axial suction port 7 of the pump housing 4 is connected to the liquid collecting container 2 via a first hose section 8, and the radial pressure connection 9 is fitted with a second hose section 10 serving to discharge the liquid conveyed by the centrifugal pump 3.
  • a reflux duct 11 designed as a hose section with a smaller cross-section leads into the area of the suction connection 7, in order to flow there into the hose section 8 connected to the liquid collecting container 2.
  • This backflow channel 11, which runs from the pressure port 9 to the intake port 7, causes a liquid circuit in the pumps due to the pressure difference between the intake port 7 and the pressure port 9 Housing 4 results, which eliminates the causes of the previous noise in the centrifugal pump 3.
  • the centrifugal pumps 12 and 13 shown in FIGS. 2 and 3 do not fundamentally differ in their construction from the centrifugal pump 3 just described. Only the pump housing 4 is formed differently from FIG. 1 in both cases, in that the return flow channel 11 is also included in this was included. Thus, in FIG. 2, based on the drawn side view of the centrifugal pump 12, it is guided in the form of a segment of a circle from the pressure nozzle 9 to the suction nozzle 7, so that it is possible to manufacture it in one piece by means of a core rotatably mounted in the mold and, in this respect, the pump housing 4.
  • the gap 14 it would also be possible for the gap 14 to extend into the intake port 7 instead of into the pressure port 9, or neither into the pressure port 9 nor into the intake port 7. Its effect would still be retained insofar as it opens into the annular pressure region of the pump wheel 6, whereby it can then be arranged at the bottom of the pump housing 4 according to structural conditions corresponding to any angle relative to the pressure connection 9 and / or the suction connection 7.

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

Abstract

A device for emptying a liquid accumulator (2) of water-carrying domestic appliances comprises a centrifugal pump (3) with a pump housing (4) enclosing an overmounted pump wheel (6), which housing has an axial intake pipe (7) and a radial pressure pipe (9), of which, as necessary, the intake pipe (7) is connected to the liquid accumulator (2) and the pressure pipe (9) serves to drain the liquid delivered by the centrifugal pump (3), in each case by means of a hose section (8 or 10) fiited to them. In order, by very simple means, to effectively prevent the occurrence on such a device of unwanted gurgling noises from the centrifugal pump (3) and attendant motor noises, it is proposed that a return conduit (11) of smaller cross-section from the area of the pressure pipe (9) or from a hose section (10) fitted to this and serving for drainage of the delivered liquid, and/or from the annular pressure area of the pump wheel (6), should empty into the area of the intake pipe (7) or into a hose section (8) fitted to it and connectable to the liquid accumulator (2). …<IMAGE>…

Description

Die Erfindung betrifft eine Vorrichtung zum Entleeren eines Flüssigkeitsauffangbehälters von wasserführenden Haushaltsgeräten, bestehend aus einer Zentrifugalpumpe mit einem ein fliegend gelagertes Pumpenrad umschließen­den Pumpengehäuse, dus über einen axialen Ansaugstutzen sowie einen radialen Druckstutzen verfügt, von denen ge­gebenenfalls jeweils mittels eines ihnen aufgesetzten Schlauchstückes der Ansaugstutzen mit dem Flüssigkeits­auffangbehälter verbunden ist, und der Druckstutzen zum Abführen der von der Zentrifugalpumpe geförderten Flüs­sigkeit dient.The invention relates to a device for emptying a liquid collecting container of water-bearing household appliances, consisting of a centrifugal pump with a pump housing enclosing a floating pump impeller, which has an axial suction nozzle and a radial pressure nozzle, of which the suction nozzle with the optionally has a piece of hose attached to it Liquid collecting container is connected, and the pressure port is used to discharge the liquid delivered by the centrifugal pump.

Bei den in solchen Vorrichtungen verwendeten Zentrifugal­pumpen handelt es sich durchweg um Pumpen kleiner Lei­stung, die gewöhnlich mit Spaltpolmotoren angetrieben werden, und die in ihrem Aufbau unempfindlich gegen Ver­ schmutzungen, Flusen, Verunreinigungen und Fremdkörper sind. Da nun die allgemeinen Bestrebungen auch bei Haus­haltsgeräten dahin gehen, möglichst geräuscharme Maschi­nen anzubieten, ist die Entleerungspumpe in diesen Prozeß der Geräuschminimierung mit einbezogen worden. Durch ver­feinerte Technik der Lagerung und der elektrischen sowie magnetischen Motorauslegung ist es inzwischen gelungen, derartige Pumpen so geräuscharm zu bauen, daß sie während des normalen Abpumpvorganges das gewünschte Laufverhalten aufweisen.The centrifugal pumps used in such devices are consistently low-power pumps which are usually driven by shaded-pole motors and which are insensitive to Ver in their construction dirt, fluff, impurities and foreign bodies. Since the general efforts now also in household appliances to offer machines that are as quiet as possible, the drainage pump has been included in this process of minimizing noise. Through refined storage technology and electrical and magnetic motor design, it has now been possible to build such pumps so quietly that they have the desired running behavior during the normal pumping process.

Hinderlich ist zur Zeit aber noch ein Geräuschzustand, der sich erst nach dem Entleeren des Flüssigkeitsauffang­behälters ergibt, und den man in Fachkreisen als"Schnor­chelgeräusch" bezeichnet. Dieses periodisch auftretende Geräusch ist lauter als die sonstigen Maschinengeräusche und vor allem deshalb sehr unangenehm, weil es abwech­selnd an- und abschwillt, was als besonders lästig emp­funden wird.However, a noise condition that is only present after the liquid collecting container has been emptied is still a hindrance and is referred to in specialist circles as "snorkeling noise". This periodically occurring noise is louder than the other machine noises and, above all, very unpleasant because it alternately swells and swells, which is perceived as particularly annoying.

Das Entstehen des vorgenannten Schnorchelgeräusches läßt sich durch die nachfolgend beschriebenen Vorgänge erklä­ren. Nachdem der Flüssigkeitsauffangbehälter leergepumpt ist, wird von der Pumpe Luft angesaugt, die dann in das Pumpengehäuse gelangt. Zu diesem Zeitpunkt steht über dem weiter rotierenden Pumpenrad eine Wassersäule in dem mit dem Druckstutzen verbundenen Schlauchstück. Sie wird, sobald Luft im Pumpengehäuse ist, infolge der Schwerkraft wieder in das Pumpengehäuse zurückgedrückt und kommt da­mit in den Bereich des immer noch umlaufenden Pumpenra­des, wird von ihm erfaßt und wieder in den Schlauch zu­rückgepumpt, woraufhin die Wassersäule erneut nach unten drückt und in das Pumpengehäuse eindringt. Bei diesen mit einer erheblichen Geräuschentwicklung verbundenen wechselnden Pumpvorgängen wird außerdem die Motorwelle der Entleerungspumpe in oszillierende Bewegungen versetzt, so daß sich die Welle und der Rotor in Achsrichtung hin- und herbewegen, und zwar soviel, wie es das Spiel der Lagerung erlaubt. Als Folge davon entstehen noch zusätz­liche, die Schnorchelgeräusche überlagernde Geräusche.The occurrence of the aforementioned snorkeling noise can be explained by the processes described below. After the liquid collection container has been pumped empty, air is sucked in by the pump, which then gets into the pump housing. At this time there is a water column above the rotating pump wheel piece of hose connected to the pressure port. As soon as there is air in the pump housing, it is pushed back into the pump housing due to the force of gravity and thus comes into the area of the still rotating pump wheel, is grasped by it and pumped back into the hose, whereupon the water column presses down again and into it Pump housing penetrates. In these alternating pumping processes, which are associated with considerable noise, the motor shaft of the drainage pump is also set in oscillating movements, so that the shaft and the rotor move back and forth in the axial direction, as much as the clearance of the bearing permits. As a result, there are additional noises superimposed on the snorkeling noises.

Bisher ist versucht worden, durch die Verwendung verschie­dener Schlauchausführungen und -anordnungen sowie mit dickeren und dünneren Schläuchen Abhilfe zu schaffen. Außerdem wurden als Filterkammern ausgebildete Vorkammern im Pumpengehäuse vorgesehen. Alle diese Maßnahmen blieben jedoch ergebnislos, und auch die Verringerung oder Unter­drückung des Axialspiels der Motorlagerung brachte keinen Erfolg.So far, attempts have been made to remedy this by using different hose designs and arrangements, as well as with thicker and thinner hoses. In addition, pre-chambers designed as filter chambers were provided in the pump housing. However, all of these measures were unsuccessful, and the reduction or suppression of the axial play of the motor bearing was also unsuccessful.

Unter den vorstehenden Gesichtspunkten ist es die Aufgabe der Erfindung, eine Vorrichtung zum Entleeren eines Flüs­ sigkeitsauffangbehälters von wasserführenden Haushalts­geräten zu schaffen, bei der das Auftreten der nachteili­gen Schnorchel- und Motorgeräusche sowohl wirksam als auch mit einfachsten Mitteln beseitigt wird.From the above points of view, it is the object of the invention to provide a device for emptying a river to create liquid collecting container of water-bearing household appliances, in which the occurrence of the disadvantageous snorkeling and motor noises is eliminated both effectively and with the simplest means.

Die zur Lösung der gestellten Aufgabe vorgeschlagenen Maßnahmen gehen aus den Ansprüchen hervor.The measures proposed to solve the task are evident from the claims.

Durch den gemäß der Erfindung die Druckseite mit der An­saugseite der Zentrifugalpumpe verbindenden Rückflußkanal wird erreicht, daß sich nach dem Leerpumpen des Auffang­behälters ein Flüssigkeitskreislauf im Pumpengehäuse bil­det, der nun die früher entstandenen Druckschwankungen und periodischen Schwingungen vermeidet. Die gleichzeitig auftretende, allerdings nur sehr geringe Reduzierung der Fördermenge der Pumpe ist in der Praxis vernachlässigbar klein und wird vom erzielten Vorteil der Geräuschminde­rung bei weitem überwogen.The return channel connecting the pressure side with the suction side of the centrifugal pump according to the invention ensures that a liquid circuit is formed in the pump housing after the collection container has been emptied, which now avoids the pressure fluctuations and periodic oscillations which previously occurred. The simultaneously occurring, but only very small, reduction in the delivery rate of the pump is negligibly small in practice and is far outweighed by the advantage of noise reduction achieved.

Ausführungsbeispiele des Anmeldungsgegenstandes werden nachfolgend anhand der Zeichnungen beschrieben. Darin zeigen im einzelnen:

  • Fig. 1 die schematische Schnittdarstellung einer in einem wasserführenden Haushaltsgerät mon­tierten erfindungsgemäßen Entleerungsvor­richtung und
  • Fig. 2 u. 3 zwei weitere in größerem Maßstab einzeln ab­gebildete ähnliche Entleerungsvorrichtungen.
Exemplary embodiments of the subject of the application are described below with reference to the drawings. The following show in detail:
  • Fig. 1 is a schematic sectional view of an emptying device according to the invention and mounted in a water-bearing household appliance
  • Fig. 2 u. 3 two further similar emptying devices individually shown on a larger scale.

Nach Fig. 1 besitzt das darin wiedergegebene wasserfüh­rende Haushaltsgerät 1 einen Flüssigkeitsauffangbehälter 2, zu dessen in regelmäßigen Abständen erforderlichen Entleerung eine Zentrifugalpumpe 3 vorgesehen ist. Diese Zentrifugalpumpe 3 weist ein Pumpengehäuse 4 auf, das ein fliegend gelagertes, von einem Elektromotor 5 ange­triebenes Pumpenrad 6 umschließt. Der axiale Ansaugstut­zen 7 des Pumpengehäuses 4 ist über ein erstes Schlauch­stück 8 mit dem Flüssigkeitsauffangbehälter 2 verbunden, und dem radialen Druckstutzen 9 ist ein zum Abführen der von der Zentrifugalpumpe 3 geförderten Flüssigkeit die­nendes zweites Schlauchstück 10 aufgesetzt.1, the water-carrying domestic appliance 1 shown therein has a liquid collecting container 2, for the emptying of which a centrifugal pump 3 is provided at regular intervals. This centrifugal pump 3 has a pump housing 4, which surrounds a pump wheel 6, which is overhung and is driven by an electric motor 5. The axial suction port 7 of the pump housing 4 is connected to the liquid collecting container 2 via a first hose section 8, and the radial pressure connection 9 is fitted with a second hose section 10 serving to discharge the liquid conveyed by the centrifugal pump 3.

Dem Hauptmerkmal der Erfindung entsprechend führt im Be­reich des Druckstutzens 9 aus dem ihm aufgesetzten Schlauchstück 10 ein als Schlauchstück geringeren Quer­schnitts ausgebildeter Rückflußkanal 11 in den Bereich des Ansaugstutzens 7, um dort in das mit dem Flüssig­keitsauffangbehälter 2 verbundene Schlauchstück 8 einzu­münden. Dieser vom Druckstutzen 9 zum Ansaugstutzen 7 verlaufende Rückflußkanal 11 bewirkt, daß sich infolge des Druckunterschiedes zwischen dem Ansaugstutzen 7 und dem Druckstutzen 9 ein Flüssigkeitskreislauf im Pumpen­ gehäuse 4 ergibt, der die Ursachen für die früheren Ge­räuscherscheinungen in der Zentrifugalpumpe 3 beseitigt.According to the main feature of the invention, in the area of the pressure connection 9, from the hose section 10 placed thereon, a reflux duct 11 designed as a hose section with a smaller cross-section leads into the area of the suction connection 7, in order to flow there into the hose section 8 connected to the liquid collecting container 2. This backflow channel 11, which runs from the pressure port 9 to the intake port 7, causes a liquid circuit in the pumps due to the pressure difference between the intake port 7 and the pressure port 9 Housing 4 results, which eliminates the causes of the previous noise in the centrifugal pump 3.

Die aus den Fig. 2 und 3 ersichtlichen Zentrifugalpumpen 12 und 13 unterscheiden sich in ihrem Aufbau grundsätz­lich nicht von der soeben beschriebenen Zentrifugalpum­pe 3. Lediglich das Pumpengehäuse 4 ist in beiden Fällen abweichend von Fig. 1 ausgebildet, indem der Rückfluß­kanal 11 jeweils mit in dieses einbezogen wurde. So ist er in Fig. 2 auf die gezeichnete Seitenansicht der Zen­trifugalpumpe 12 bezogen kreissegmentförmig vom Druck­stutzen 9 zum Ansaugstutzen 7 geführt, damit die Möglich­keit besteht, ihn durch einen drehbar im Formwerkzeug gelagerten Kern und insofern das Pumpengehäuse 4 ein­stückig herzustellen.The centrifugal pumps 12 and 13 shown in FIGS. 2 and 3 do not fundamentally differ in their construction from the centrifugal pump 3 just described. Only the pump housing 4 is formed differently from FIG. 1 in both cases, in that the return flow channel 11 is also included in this was included. Thus, in FIG. 2, based on the drawn side view of the centrifugal pump 12, it is guided in the form of a segment of a circle from the pressure nozzle 9 to the suction nozzle 7, so that it is possible to manufacture it in one piece by means of a core rotatably mounted in the mold and, in this respect, the pump housing 4.

Eine wiederum gegenüber der Fig. 2 abgewandelte Ausge­staltung des zwischen dem Druckstutzen 9 und dem Ansaug­stutzen 7 verlaufenden Rückflußkanals 11 zeigt Fig. 3, wo er als zum Pumpenrad 6 hin offener Spalt 14 in das Pumpengehäuse 4 eingeformt ist. Ein solches Pumpengehäuse 4 läßt sich nicht nur sehr viel einfacher fertigen als das Pumpengehäuse 4 der Fig. 2, sondern der zum Pumpen­rad 6 hin offene Spalt 14 kann auch weniger leicht mit Schmutzteilchen verstopft werden, das insbesondere für die Entleerungspumpen von Wasch- oder Geschirrspülma­ schinen große Bedeutung hat.3, where it is molded into the pump housing 4 as a gap 14 which is open towards the pump wheel 6, shows a configuration, again modified in comparison with FIG. 2, of the return flow channel 11 running between the pressure port 9 and the intake port 7. Such a pump housing 4 is not only much easier to manufacture than the pump housing 4 of FIG. 2, but the gap 14 which is open towards the pump wheel 6 can also be less easily clogged with dirt particles, in particular for the drainage pumps of washing or dishwashing machines seems very important.

Abweichend von Fig. 3 wäre es auch möglich, daß der Spalt 14 statt in den Druckstutzen 9 in den Ansaugstutzen 7 oder weder in den Druckstutzen 9 noch in den Ansaugstut­zen 7 hineinreicht. Seine Wirkung bliebe trotzdem erhal­ten, insofern er in den ringförmigen Druckbereich des Pumpenrades 6 einmündet, wobei man ihn sodann konstruk­tiven Gegebenheiten entsprechend um einen beliebigen Win­kel gegenüber dem Druckstutzen 9 und/oder dem Ansaugstut­zen 7 versetzt am Boden des Pumpengehäuses 4 anordnen kann.3, it would also be possible for the gap 14 to extend into the intake port 7 instead of into the pressure port 9, or neither into the pressure port 9 nor into the intake port 7. Its effect would still be retained insofar as it opens into the annular pressure region of the pump wheel 6, whereby it can then be arranged at the bottom of the pump housing 4 according to structural conditions corresponding to any angle relative to the pressure connection 9 and / or the suction connection 7.

Claims (3)

1. Vorrichtung zum Entleeren eines Flüssigkeitsauffang­behälters von wasserführenden Haushaltsgeräten, be­stehend aus einer Zentrifugalpumpe mit einem ein flie­gend gelagertes Pumpenrad umschließenden Pumpenge­häuse, das über einen axialen Ansaugstutzen sowie einen radialen Druckstutzen verfügt, von denen ge­gebenenfalls jeweils mittels eines ihnen aufgesetzten Schlauchstückes der Ansaugstutzen mit dem Flüssig­keitsauffangbehälter verbunden ist, und der Druck­stutzen zum Abführen der von der Zentrifugalpumpe geförderten Flüssigkeit dient,
dadurch gekennzeichnet, daß aus dem Bereich des Druck­stutzens (9) oder von einem ihm aufgesetzten, zum Abführen der geförderten Flüssigkeit dienenden Schlauchstück (10) bzw. aus dem ringförmigen Druck­bereich das Pumpenrades (6) ein in den Bereich des Ansaugstutzens (7) oder in ein diesem aufgesetztes, mit dem Flüssigkeitsauffangbehälter (2) verbindbares Schlauchstück (8) ein Rückflußkanal (11) geringeren Querschnitts einmündet.1.Device for emptying a liquid collecting container from water-bearing household appliances, consisting of a centrifugal pump with a pump housing surrounding a floating pump wheel, which has an axial suction nozzle and a radial pressure nozzle, of which, if necessary, the suction nozzle is connected to the liquid collecting container by means of a piece of hose placed on them and the pressure port serves to discharge the liquid conveyed by the centrifugal pump,
characterized in that from the area of the pressure port (9) or from one placed on it, for Discharge of the conveyed liquid serving hose section (10) or from the ring-shaped pressure area the pump wheel (6) into the area of the suction nozzle (7) or into a hose section (8), which can be connected to the liquid collection container (2) and a return flow channel (11 ) leads to a smaller cross-section. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Rückflußkanal (11) in kreissegmentförmiger Anordnung vom Druckstutzen (9) zum Ansaugstutzen (7) führt.2. Apparatus according to claim 1, characterized in that the return flow channel (11) leads in a circular segment-shaped arrangement from the pressure port (9) to the intake port (7). 3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Rückflußkanal (11) als zum Pumpenrad (6) hin offener Spalt (14) in das Pumpengehäuse (4) einge­formt ist.3. Apparatus according to claim 1, characterized in that the return flow channel (11) is formed as an open to the pump wheel (6) towards the gap (14) in the pump housing (4).
EP89106861A 1988-04-20 1989-04-17 Liquid accumulator emptying device for water running household appliances Expired - Lifetime EP0338484B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8805234U 1988-04-20
DE8805234 1988-04-20

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EP0338484A2 true EP0338484A2 (en) 1989-10-25
EP0338484A3 EP0338484A3 (en) 1990-04-04
EP0338484B1 EP0338484B1 (en) 1992-12-16

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EP (1) EP0338484B1 (en)
DE (2) DE58902991D1 (en)

Cited By (3)

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DE4034927A1 (en) * 1990-11-02 1992-05-07 Miele & Cie Installation for emptying liq. collection receptacle of washing machine etc. - incorporates pump unit connected to receptacle via suction nipple and reduces noise without reduction in conveying performance
DE4128689A1 (en) * 1991-08-29 1993-03-04 Miele & Cie Pumping-out installation for dryer condensn. unit - has pump carried by top side of support plate covering collecting vessel
EP1887126A1 (en) * 2006-08-07 2008-02-13 Electrolux Home Products Corporation N.V. Electric motor-driven water pump for a washing machine

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US5143513A (en) * 1990-11-14 1992-09-01 Maytag Corporation Dishwasher pump
AU747592B2 (en) * 1998-03-13 2002-05-16 Unitec Institute Of Technology Improved pumping apparatus and methods
AU2447599A (en) * 1999-02-08 2000-08-25 Arcelik A.S. Washing machine with a suppressed discharge-pump noise
NZ336855A (en) * 1999-07-21 2002-03-01 Unitec Inst Of Technology Multi-phase flow pump with vanes having large spaces there between
NL1022785C2 (en) * 2003-02-26 2004-08-30 Tendris Solutions Bv Pump or turbine, drive that includes such a pump or turbine and outboard motor.
ATE403805T1 (en) * 2005-09-23 2008-08-15 Coprecitec Sl DRAIN PUMP OF A HOUSEHOLD APPLIANCE
DE102012215626A1 (en) * 2012-09-04 2014-05-28 Bayerische Motoren Werke Aktiengesellschaft Sliding roof rain gutter for motor car, has pipe sections interconnected through curved intermediate portion, where one of pipe section runs into intermediate portion in parallel manner and extended to drain groove of pipe socket
WO2015037669A1 (en) 2013-09-12 2015-03-19 株式会社 荏原製作所 Device and method for alleviating and preventing cavitation surge of water supply conduit system
US10513343B2 (en) * 2015-08-03 2019-12-24 Parker-Hannifin Corporation Integral pump pressure relief valve
DE102016216737B4 (en) * 2016-09-05 2018-03-15 BSH Hausgeräte GmbH Laundry care device with a controller

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Publication number Priority date Publication date Assignee Title
DE4034927A1 (en) * 1990-11-02 1992-05-07 Miele & Cie Installation for emptying liq. collection receptacle of washing machine etc. - incorporates pump unit connected to receptacle via suction nipple and reduces noise without reduction in conveying performance
DE4128689A1 (en) * 1991-08-29 1993-03-04 Miele & Cie Pumping-out installation for dryer condensn. unit - has pump carried by top side of support plate covering collecting vessel
EP1887126A1 (en) * 2006-08-07 2008-02-13 Electrolux Home Products Corporation N.V. Electric motor-driven water pump for a washing machine

Also Published As

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DE58902991D1 (en) 1993-01-28
US4964783A (en) 1990-10-23
DE8904866U1 (en) 1989-07-27
EP0338484A3 (en) 1990-04-04
EP0338484B1 (en) 1992-12-16

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