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EP0320061B1 - Pump device for low-viscosity liquids - Google Patents

Pump device for low-viscosity liquids Download PDF

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Publication number
EP0320061B1
EP0320061B1 EP88202779A EP88202779A EP0320061B1 EP 0320061 B1 EP0320061 B1 EP 0320061B1 EP 88202779 A EP88202779 A EP 88202779A EP 88202779 A EP88202779 A EP 88202779A EP 0320061 B1 EP0320061 B1 EP 0320061B1
Authority
EP
European Patent Office
Prior art keywords
intermediate shaft
pump
shaft
motor
pump device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88202779A
Other languages
German (de)
French (fr)
Other versions
EP0320061A2 (en
EP0320061A3 (en
Inventor
Leo Bertram
Hugo Dr. Schemmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool Europe BV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0320061A2 publication Critical patent/EP0320061A2/en
Publication of EP0320061A3 publication Critical patent/EP0320061A3/en
Application granted granted Critical
Publication of EP0320061B1 publication Critical patent/EP0320061B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • 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
    • F04D29/20—Mounting rotors on shafts
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/001—Preventing vapour lock
    • F04D9/002—Preventing vapour lock by means in the very pump
    • F04D9/003—Preventing vapour lock by means in the very pump separating and removing the vapour
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the invention relates to a pumping device for slightly viscous liquids, in particular lightly polluted water, with an electric drive motor, which is arranged above the liquid level in a collecting container, the pump wheel of which is arranged at a distance from the motor at the bottom of the collecting container in a pumping chamber, and is driven via a shaft bridging the distance, which extends without a seal into the pump sump.
  • the intermediate bearing point is designed to absorb the bending forces which are exerted by the pump wheel on the intermediate shaft. Bending loads coming from the pump wheel can be absorbed by means of the intermediate bearing point of the intermediate bush. It is particularly advantageous if the intermediate storage location is provided at the point at which the risk of maximum bending occurs without storage.
  • the shaft arrangement consisting of the intermediate shaft and the intermediate bushing
  • the shaft arrangement can be inserted from above into a ceiling wall, which in turn is inserted into the container ceiling of the collecting container.
  • the motor is fixed by means of a snap spring on the ceiling wall and the intermediate shaft and the Intermediate socket defines. After inserting the intermediate bush and shaft, the motor is then attached, which holds the intermediate bush and shaft with its end shield; only the snap spring ensures a sufficiently firm, captive connection.
  • the pump wheel is constructed symmetrically and consists of elastic plastic, with a receiving opening for the intermediate shaft being provided in its center, the dimensions of which are of different sizes in two mutually perpendicular directions, and that in the receptacle insertable plug end of the intermediate shaft is shaped accordingly to ensure a positive connection to the pump wheel.
  • the elastic pump wheel formed from plastic in the injection molding process can thus be fixed in a rotationally fixed manner, for example, if the receiving opening and the plug end of the intermediate shaft are flattened.
  • the head of the plug end of the intermediate shaft is bead-shaped, then the elastic pump wheel can simply be buttoned onto the insertable intermediate shaft end.
  • the upper wall of the pump chamber is designed to rise conically towards the intermediate shaft and the size of an annular opening around the intermediate shaft is selected so that the ventilation of the pump chamber is ensured through the ring opening.
  • the pump device shown in FIG. 1 is provided for pumping condensate liquid out of a clothes dryer.
  • a clothes dryer with a condenser has a collecting container 1, into which a pump device 3 is inserted.
  • the container ceiling 4 has an opening 5 into which a ceiling wall 6 of the pump device 3 fits.
  • the top wall 6 of the pumping device 3 rests on shoulders 7 around the opening 5 and at the same time stands with feet 8 on the bottom 9 of the collecting container 4.
  • the pump connector 12 leads through the Ceiling wall 6 upwards.
  • a sewage pipe can be connected to it.
  • the bearing block 13 is provided with a central, vertical bore 15 and a connecting piece 16 which extends the bore 15 and serves to support a shaft arrangement 17.
  • the shaft arrangement 17 consists of an intermediate bush 18, which can rest on shoulders 19 of the bearing block 13.
  • the intermediate bushing 18 is provided with an intermediate storage location 20 between the top wall 6 and the pump chamber wall 10.
  • An intermediate shaft 21, which can be inserted into the intermediate bushing 18, is supported in the intermediate bearing point 20 and carries the pump wheel 23, which is made of elastic plastic, at a push-on end 22.
  • the intermediate shaft is axially fixed by a contact shoulder 39a of the motor end shield 39 and the run-up shoulder 18a of the intermediate bushing 18.
  • the intermediate bushing 18 and the intermediate shaft 21 consist of a wear-resistant and low-friction plastic.
  • the intermediate shaft 21 is positively connected to the shaft 24 of the rotor 25 of a two-pole single-phase synchronous motor 26.
  • the rotor 25 accordingly consists of a two-pole magnetized permanent magnetic material.
  • the motor 26 is pressed onto the bearing block 13 by means of a snap spring 27.
  • the snap spring 27 is supported on a bearing arm 28 and engages in a recess 30 in the bearing block 13.
  • the push-on end 22 of the intermediate shaft 21 has a button-shaped or bead-shaped extension 31 at the extreme end, via which the pump wheel 23 can be unbuttoned with a central receiving opening 40, as can be seen more clearly from FIG. 2.
  • the push-on end 22 is flattened in the button area 32, for example approximately elliptical in section.
  • a lower wall 33 of the pump chamber 11 is designed to be removable. In this lower wall there is a suction hole 34. Another hole 35 is provided around the intermediate shaft 21 in the upper wall 10 of the pump chamber. This wall runs slightly conically curved upwards towards the opening 35, and the opening 35 is kept so large around the intermediate shaft 21 that air bubbles can escape into the interior 36 of the collecting container 1 without difficulty.
  • the pump device is installed in such a way that the intermediate bush 18 is first inserted into the bearing block 13 of the pump device 37, namely into the bore 15, until it bears against the associated shoulders 19. Then the intermediate shaft 21 is inserted from above without the impeller Intermediate bush inserted and the motor 14 added.
  • the motor shaft 24 receives a positive connection 38 to the intermediate shaft 21 via an external toothing provided on it and an internal toothing provided on the intermediate shaft 21.
  • the motor is fixed on the bearing block 13, and at the same time the intermediate shaft 21 and the intermediate bushing 18 fixed by the motor end shield 39.
  • the intermediate storage location 20 then ensures adequate guidance and mounting of the intermediate shaft 21 at a distance below the ceiling wall 6.
  • the pump chamber is designed symmetrically so that the single-phase synchronous motor 14 can rotate the pump wheel 23 in both directions and the water entering through the central opening 34 from the sump 41 into the pump can be conveyed away through the radially arranged pump nozzle 12 in each direction of rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Textile Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung bezieht sich auf eine Pumpvorrichtung für leicht viskose Flüssigkeiten, insbesondere leicht verschmutztes Wasser, mit einem elektrischen Antriebsmotor, der oberhalb des Flüssigkeitsniveaus in einem Auffangbehälter angeordnet ist, dessen Pumpenrad in einem Abstand vom Motor am Boden des Auffangbehälters in einer Pumpkammer angeordnet ist und der über eine den Abstand überbrückende Welle angetrieben wird, die dichtungslos in den Pumpsumpf hineinreicht.The invention relates to a pumping device for slightly viscous liquids, in particular lightly polluted water, with an electric drive motor, which is arranged above the liquid level in a collecting container, the pump wheel of which is arranged at a distance from the motor at the bottom of the collecting container in a pumping chamber, and is driven via a shaft bridging the distance, which extends without a seal into the pump sump.

Derartige Pumpvorrichtungen sind bekannt zum Abpumpen von Kondensatflüssigkeit aus Auffangbehältern von Wäschetrocknern. Der deutliche Abstand zwischen Pumpenrad und Motor ist dabei durch die Kondensatorkonstruktion vorgegeben. Es ist bekannt, bei derartigen Pumpvorrichtungen Spaltpolmotoren einzusetzen, die auch aufgrund ihrer kräftigen Dimensionierung von Gewicht her schwer sind. Die etwas eigenwillige Konstruktion einer solchen Kondensatpumpe bringt es dann mit sich, daß solche Pumpen als Einzelteil nicht aufrecht stehen, sondern aufgrund ihrer Kopflastigkeit mit dem schweren Motor umfallen. Ihre Handhabung wird dadurch erschwert. Hinzu kommt, daß die gebräuchlichen Spaltpolmotoren aufgrund ihrer Dimensionen relativ viel Raum beanspruchen.Pump devices of this type are known for pumping out condensate liquid from collecting containers of tumble dryers. The clear distance between the impeller and the motor is determined by the capacitor design. It is known to use shaded-pole motors with such pumping devices, which are also heavy in weight due to their strong dimensions. The somewhat idiosyncratic design of such a condensate pump then means that such pumps do not stand upright as a single part, but instead fall over with the heavy motor due to their top heaviness. This makes their handling more difficult. In addition, the conventional shaded-pole motors take up a relatively large amount of space due to their dimensions.

Ein weiterer Nachteil der bekannten Konstruktionen ist, daß die metallische Motorwelle bis in den Sumpf der Pumpvorrichtung hinein reicht und deshalb aus Sicherheitsgründen geerdet werden muß. Diese Erdung erfordert besondere Montagemaßnahmen.Another disadvantage of the known designs is that the metallic motor shaft extends into the sump of the pump device and must therefore be earthed for safety reasons. This grounding requires special installation measures.

Es ist Aufgabe der Erfindung, eine Pumpvorrichtung der eingangs erwähnten Art zu schaffen, bei der in den Sumpf keine Metallteile des Motors hineinreichen und bei der der Bedarf an Antriebsleistung derart herabgesetzt ist, daß ein kleiner dimensionierter Motor eingesetzt werden kann und daß die Handhabung verbessert ist.It is an object of the invention to provide a pumping device of the type mentioned in the introduction, in which no metal parts of the motor extend into the sump and in which the need for drive power is reduced in such a way that a smaller-sized motor can be used and that handling is improved .

Die Aufgabe wird erfindungsgemäß gelöst durch die Kombination folgender Merkmale:

a)
der Antriebsmotor ist ein kleinbauender Elektromotor, insbesondere ein zweipoliger Einphasensynchronmotor mit permanentmagnetischem Rotor,
b)
es ist eine Zwischenwelle vorgesehen, die aus einem verschleißfesten und reibungsarmen Kunststoff besteht,
c)
die Zwischenwelle ist trennbar, jedoch formschlüssig mit der Motorwelle verbunden,
d)
auf die Zwischenwelle ist eine Zwischenbuchse aus verschleißfestem und reibungsarmem Kunststoff aufgeschoben, die die Zwischenwelle am Motorlagerschild zentriert und lagert an einer Zwischenlagerstelle zwischen formschlüssiger Verbindung und Pumpenrad,
e)
das Pumpenrad ist abnehmbar und wird erst beim Zusammenbau aufgeschoben.

The object is achieved according to the invention by combining the following features:
a)
the drive motor is a small electric motor, in particular a two-pole single-phase synchronous motor with a permanent magnetic rotor,
b)
an intermediate shaft is provided, which consists of a wear-resistant and low-friction plastic,
c)
the intermediate shaft is separable, but positively connected to the motor shaft,
d)
an intermediate bush made of wear-resistant and low-friction plastic is pushed onto the intermediate shaft, which centers the intermediate shaft on the motor end shield and supports it at an intermediate bearing point between the positive connection and the pump wheel,
e)
the pump wheel is removable and is only pushed on during assembly.

Durch einen derartigen Aufbau der Wellenverbindung zu dem Pumpenrad kann auf eine metallische Welle, die bis zum Pumpenrad reicht, verzichtet werden. Die Zwischenbuchse sorgt mit der Zwischenlagerstelle für eine ausreichende Führung und Stabilisierung der Kunststoffwelle. Eine lösbare Verbindung von Motor und Pumpenrad bietet Vorteile in fertigungstechnischer Hinsicht und ist servicefreundlicher. Der Einsatz eines Einphasensynchronmotors bringt Vorteile hinsichtlich des Gewichts- und Raumbedarfes.With such a structure of the shaft connection to the pump wheel, a metallic shaft extending up to Pump wheel is enough to be dispensed with. The intermediate bushing with the intermediate bearing point ensures adequate guidance and stabilization of the plastic shaft. A detachable connection between motor and pump wheel offers advantages in terms of production technology and is more service-friendly. The use of a single-phase synchronous motor brings advantages in terms of weight and space requirements.

Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß die Zwischenlagerstelle zum Auffangen der Biegekräfte, die vom Pumpenrad auf die Zwischenwelle ausgeübt werden, ausgelegt ist. Mittels der Zwischenlagerstelle der Zwischenbuchse lassen sich Biegebelastungen, die vom Pumpenrad her kommen, auffangen. Besonders günstig ist es dabei, wenn die Zwischenlagerstelle an der Stelle vorgesehen ist, an der die Gefahr maximaler Biegung ohne Lagerung auftritt.According to a further embodiment of the invention it is provided that the intermediate bearing point is designed to absorb the bending forces which are exerted by the pump wheel on the intermediate shaft. Bending loads coming from the pump wheel can be absorbed by means of the intermediate bearing point of the intermediate bush. It is particularly advantageous if the intermediate storage location is provided at the point at which the risk of maximum bending occurs without storage.

Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß die Wellenanordnung, bestehend aus der Zwischenwelle und der Zwischenbuchse, von oben her in eine Deckenwand einsetzbar ist, die ihrerseits in die Behälterdecke des Auffangbehälters eingesetzt ist. Mit dieser Konstruktion wird die Montage der Pumpvorrichtung wesentlich erleichtert. Nacheinander werden die Zwischenbuchse und die Welle durch die Deckenwand in den Auffangbehälter eingesetzt. Eine solche Montage läßt sich ohne weiteres automatisieren.According to a further embodiment of the invention it is provided that the shaft arrangement, consisting of the intermediate shaft and the intermediate bushing, can be inserted from above into a ceiling wall, which in turn is inserted into the container ceiling of the collecting container. With this construction, the assembly of the pump device is made considerably easier. The intermediate bushing and the shaft are inserted one after the other through the ceiling wall into the collecting container. Such an assembly can be automated easily.

In Verfolgung dieses Gedankens ist vorgesehen, daß der Motor mittels einer Schnappfeder auf der Deckenwand festgesetzt ist und dabei die Zwischenwelle und die Zwischenbuchse festlegt. Nach dem Einsetzen von Zwischenbuchse und Welle wird dann der Motor aufgesetzt, der mit seinem Lagerschild Zwischenbuchse und Welle festhält; lediglich die Schnappfeder sorgt für eine ausreichend feste unverlierbare Verbindung.In pursuit of this idea it is provided that the motor is fixed by means of a snap spring on the ceiling wall and the intermediate shaft and the Intermediate socket defines. After inserting the intermediate bush and shaft, the motor is then attached, which holds the intermediate bush and shaft with its end shield; only the snap spring ensures a sufficiently firm, captive connection.

Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß das Pumpenrad symmetrisch aufgebaut ist und aus elastischem Kunststoff besteht, wobei in seinem Zentrum eine Aufnahmeöffnung für die Zwischenwelle vorgesehen ist, deren Abmessung in zwei senkrecht aufeinander stehenden Richtungen unterschiedlich groß ausgebildet ist, und daß das in die Aufnahmeöffnung einsteckbare Steckende der Zwischenwelle entsprechend geformt ist, um eine formschlüssige Verbindung zum Pumpenrad zu gewährleisten. Das aus Kunststoff im Spritzverfahren gebildete elastische Pumpenrad kann so beispielsweise auf der Zwischenwelle verdrehfest festgelegt werden, wenn die Aufnahmeöffnung und das Steckende der Zwischenwelle abgeplattet ausgebildet sind. Wenn darüber hinaus in Weiterbildung der Erfindung vorgesehen ist, daß der Kopf des Steckendes der Zwischenwelle wulstförmig ausgebildet ist, dann läßt sich das elastische Pumpenrad einfach auf das einsteckbare Zwischenwellenende aufknöpfen.According to a further embodiment of the invention it is provided that the pump wheel is constructed symmetrically and consists of elastic plastic, with a receiving opening for the intermediate shaft being provided in its center, the dimensions of which are of different sizes in two mutually perpendicular directions, and that in the receptacle insertable plug end of the intermediate shaft is shaped accordingly to ensure a positive connection to the pump wheel. The elastic pump wheel formed from plastic in the injection molding process can thus be fixed in a rotationally fixed manner, for example, if the receiving opening and the plug end of the intermediate shaft are flattened. In addition, if it is provided in a further development of the invention that the head of the plug end of the intermediate shaft is bead-shaped, then the elastic pump wheel can simply be buttoned onto the insertable intermediate shaft end.

Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß die obere Wand der Pumpenkammer zur Zwischenwelle hin kegelförmig ansteigend ausgebildet ist und die Größe einer Ringöffnung um die Zwischenwelle so gewählt ist, daß die Entlüftung der Pumpenkammer durch die Ringöffnung hindurch gewährleistet ist.According to a further embodiment of the invention, it is provided that the upper wall of the pump chamber is designed to rise conically towards the intermediate shaft and the size of an annular opening around the intermediate shaft is selected so that the ventilation of the pump chamber is ensured through the ring opening.

Die Erfindung wird anhand der Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 einen Schnitt durch eine Pumpvorrichtung für leicht viskose Flüssigkeiten, die für einen Kondensations-Wäschetrockner geeignet ist,
  • Fig. 2 einen Schnitt durch das Pumpenrad und die Pumpkammer der Pumpvorrichtung.
The invention is explained in more detail with reference to the drawing. Show it:
  • 1 shows a section through a pumping device for slightly viscous liquids, which is suitable for a condensation dryer,
  • Fig. 2 shows a section through the pump wheel and the pump chamber of the pump device.

Die in Fig. 1 dargestellte Pumpvorrichtung ist vorgesehen für das Abpumpen von Kondensatflüssigkeit aus einem Wäschetrockner. Ein Wäschetrockner mit Kondensator weist einen Auffangbehälter 1 auf, in den eine Pumpvorrichtung 3 eingesetzt ist. Zu diesem Zweck hat die Behälterdecke 4 eine Öffnung 5, in die eine Deckenwand 6 der Pumpvorrichtung 3 hineinpaßt. Die Deckenwand 6 der Pumpvorrichtung 3 liegt auf Schultern 7 rings um die Öffnung 5 auf und steht gleichzeitig mit Füßen 8 auf dem Boden 9 des Auffangbehälters 4.The pump device shown in FIG. 1 is provided for pumping condensate liquid out of a clothes dryer. A clothes dryer with a condenser has a collecting container 1, into which a pump device 3 is inserted. For this purpose, the container ceiling 4 has an opening 5 into which a ceiling wall 6 of the pump device 3 fits. The top wall 6 of the pumping device 3 rests on shoulders 7 around the opening 5 and at the same time stands with feet 8 on the bottom 9 of the collecting container 4.

Auf der Deckenwand 6, die gemeinsam mit einer Wand 10, einer Pumpkammer 11 und einem Pumpstutzen 12 aus Kunststoff gespritzt ist, befindet sich ein ebenfalls mitgespritzter Lagerbock 13 für einen Antriebsmotor 14. Wie man aus Fig. 1 erkennt, führt der Pumpstutzen 12 durch die Deckenwand 6 nach oben hindurch. Oberhalb der Deckenwand 6 kann an ihn eine Abwasserleitung angeschlossen werden. Der Lagerbock 13 ist mit einer zentralen, lotrechten Bohrung 15 und einem die Bohrung 15 verlängernden Stutzen 16 versehen, der der Lagerung einer Wellenanordnung 17 dient.On the top wall 6, which is injection-molded from plastic together with a wall 10, a pump chamber 11 and a pump connector 12, there is also a bearing block 13 for a drive motor 14, which is also co-injected. As can be seen from FIG. 1, the pump connector 12 leads through the Ceiling wall 6 upwards. Above the ceiling wall 6, a sewage pipe can be connected to it. The bearing block 13 is provided with a central, vertical bore 15 and a connecting piece 16 which extends the bore 15 and serves to support a shaft arrangement 17.

Die Wellenanordnung 17 besteht aus einer Zwischenbuchse 18, die auf Schultern 19 des Lagerbockes 13 aufsitzen kann. Die Zwischenbuchse 18 ist zwischen Deckenwand 6 und Pumpkammerwand 10 mit einer Zwischenlagerstelle 20 versehen. In der Zwischenlagerstelle 20 wird eine in die Zwischenbuchse 18 einschiebbare Zwischenwelle 21 gelagert, die an einem Aufsteckende 22 das aus elastischem Kunststoff bestehende Pumpenrad 23 trägt. Dabei wird die Zwischenwelle axial fixiert durch eine Anlageschulter 39a des Motorlagerschildes 39 und der Auflaufschulter 18a der Zwischenbuchse 18. Die Zwischenbuchse 18 und die Zwischenwelle 21 bestehen aus einem verschleißfesten und reibungsarmen Kunststoff. Die Zwischenwelle 21 ist formschlüssig verbunden mit der Welle 24 des Rotors 25 eines zweipoligen Einphasensynchronmotors 26. Der Rotor 25 besteht entsprechend aus einem zweipolig magnetisierten dauermagnetischen Magnetmaterial. Der Motor 26 wird mittels einer Schnappfeder 27 auf den Lagerbock 13 aufgepreßt. Die Schnappfeder 27 stützt sich zu diesem Zweck an einem Lagerarm 28 ab und greift in eine Vertiefung 30 des Lagerbockes 13.The shaft arrangement 17 consists of an intermediate bush 18, which can rest on shoulders 19 of the bearing block 13. The intermediate bushing 18 is provided with an intermediate storage location 20 between the top wall 6 and the pump chamber wall 10. An intermediate shaft 21, which can be inserted into the intermediate bushing 18, is supported in the intermediate bearing point 20 and carries the pump wheel 23, which is made of elastic plastic, at a push-on end 22. The intermediate shaft is axially fixed by a contact shoulder 39a of the motor end shield 39 and the run-up shoulder 18a of the intermediate bushing 18. The intermediate bushing 18 and the intermediate shaft 21 consist of a wear-resistant and low-friction plastic. The intermediate shaft 21 is positively connected to the shaft 24 of the rotor 25 of a two-pole single-phase synchronous motor 26. The rotor 25 accordingly consists of a two-pole magnetized permanent magnetic material. The motor 26 is pressed onto the bearing block 13 by means of a snap spring 27. For this purpose, the snap spring 27 is supported on a bearing arm 28 and engages in a recess 30 in the bearing block 13.

Das Aufsteckende 22 der Zwischenwelle 21 weist am äußersten Ende eine knopf- oder wulstförmige Erweiterung 31 auf, über die das Pumpenrad 23 mit einer zentralen Aufnahmeöffnung 40, wie deutlicher aus Fig. 2 zu ersehen ist, aufknöpfbar ist. Das Aufsteckende 22 ist, um eine ausreichende Verdrehsicherheit zu erhalten, im Aufknöpfbereich 32 abgeflacht, im Schnitt beispielsweise etwa elliptisch, ausgebildet.The push-on end 22 of the intermediate shaft 21 has a button-shaped or bead-shaped extension 31 at the extreme end, via which the pump wheel 23 can be unbuttoned with a central receiving opening 40, as can be seen more clearly from FIG. 2. In order to obtain sufficient security against rotation, the push-on end 22 is flattened in the button area 32, for example approximately elliptical in section.

Eine untere Wand 33 der Pumpkammer 11 ist abnehmbar gestaltet. In dieser unteren Wand befindet sich ein Ansaugloch 34. Ein weiteres Loch 35 ist rings um die Zwischenwelle 21 in der oberen Wand 10 der Pumpkammer vorgesehen. Diese Wand läuft schwach kegelförmig nach oben gewölbt auf die Öffnung 35 zu, und die Öffnung 35 ist rings um die Zwischenwelle 21 so groß gehalten, daß Luftblasen ohne Schwierigkeiten in den Innenraum 36 des Auffangbehälters 1 entweichen können.A lower wall 33 of the pump chamber 11 is designed to be removable. In this lower wall there is a suction hole 34. Another hole 35 is provided around the intermediate shaft 21 in the upper wall 10 of the pump chamber. This wall runs slightly conically curved upwards towards the opening 35, and the opening 35 is kept so large around the intermediate shaft 21 that air bubbles can escape into the interior 36 of the collecting container 1 without difficulty.

Die Montage der Pumpvorrichtung erfolgt in der Weise, daß in den Lagerbock 13 der Pumpvorrichtung 37, und zwar in die Bohrung 15 zunächst die Zwischenbuchse 18 eingeschoben wird bis zum Anliegen an den zugeordneten Schultern 19. Dann wird von oben die Zwischenwelle 21 ohne Pumpenrad in die Zwischenbuchse eingeschoben und der Motor 14 nachgesetzt. Die Motorwelle 24 erhält dabei über eine an ihr vorgesehene Außenzahnung und eine an der Zwischenwelle 21 vorgesehene Innenzahnung eine formschlüssige Verbindung 38 zu der Zwischenwelle 21. Durch das Aufschnappen der Feder 27 wird der Motor auf dem Lagerbock 13 festgelegt, und gleichzeitig werden Zwischenwelle 21 und Zwischenbuchse 18 vom Motorlagerschild 39 festgesetzt. Die Zwischenlagerstelle 20 sorgt dann für eine ausreichende Führung und Lagerung der Zwischenwelle 21 in einem Abstand unterhalb der Deckenwand 6.The pump device is installed in such a way that the intermediate bush 18 is first inserted into the bearing block 13 of the pump device 37, namely into the bore 15, until it bears against the associated shoulders 19. Then the intermediate shaft 21 is inserted from above without the impeller Intermediate bush inserted and the motor 14 added. The motor shaft 24 receives a positive connection 38 to the intermediate shaft 21 via an external toothing provided on it and an internal toothing provided on the intermediate shaft 21. By snapping the spring 27, the motor is fixed on the bearing block 13, and at the same time the intermediate shaft 21 and the intermediate bushing 18 fixed by the motor end shield 39. The intermediate storage location 20 then ensures adequate guidance and mounting of the intermediate shaft 21 at a distance below the ceiling wall 6.

Bei abgenommener unterer Pumpkammerwand 33 wird nun über die knopfförmige Erweiterung das aus Fig. 2 im Schnitt zu erkennende Pumpenrad 23 aufgeknöpft. Dieses Pumpenrad 23 besteht aus einem elastischen Werkstoff, und dementsprechend sind die Flügel 23a des Pumpenrades 23 entgegen der jeweiligen Drehrichtung wegbiegbar. Weitere Einzelheiten zu der elastischen Flügelausbildung sind in der DE-PS 2407109 beschrieben.With the lower pump chamber wall 33 removed, the pump wheel 23, which can be seen in section in FIG. 2, is now unbuttoned via the button-shaped extension. This impeller 23 is made of an elastic material, and accordingly the vanes 23a of the impeller 23 are opposite bendable in the respective direction of rotation. Further details on the elastic wing formation are described in DE-PS 2407109.

Die Pumpenkammer ist symmetrisch ausgebildet, so daß der Einphasensynchronmotor 14 das Pumpenrad 23 in beiden Richtung drehen kann und in jeder Drehrichtung das durch die zentrale Öffnung 34 aus dem Sumpf 41 in die Pumpe eintretende Wasser durch den radial angeordneten Pumpstutzen 12 wegförderbar ist.The pump chamber is designed symmetrically so that the single-phase synchronous motor 14 can rotate the pump wheel 23 in both directions and the water entering through the central opening 34 from the sump 41 into the pump can be conveyed away through the radially arranged pump nozzle 12 in each direction of rotation.

Infolge des Einsatzes einer Kunststoff-Zwischenwelle 21 kann bei dem Antriebsmotor 14 auf eine Erdung verzichtet werden. Bei Verwendung eines Einphasensynchronmotors erzielt man eine beträchtliche Gewichts- und Raumersparnis. Das System ist leicht montierbar und servicefreundlich. Es treten keine Probleme hinsichtlich der Kopflastigkeit auf, weil der Motor von Gewicht leicht ist.As a result of the use of a plastic intermediate shaft 21, grounding can be dispensed with in the drive motor 14. When using a single-phase synchronous motor, considerable weight and space savings are achieved. The system is easy to assemble and easy to service. There are no problems with top heaviness because the motor is light in weight.

Claims (9)

1. A pump device for low-viscosity liquids, in particular slightly polluted water, which device comprises an electric drive motor arranged above the liquid level in a receptacle (1) and whose pump wheel (23) is arranged in a pump chamber (11) at a distance from the motor (14) on the bottom (9) of the receptacle (1) and is driven by a shaft (21) which bridges the distance and which extends into the pump well (41) without a sealing, characterised by the combination of the following features:
a)   the drive motor (14) is a compact electric motor, in particular a two-pole single-phase synchronous motor with a permanent-magnet rotor (25),
b)   there is provided an intermediate shaft (21) made of a wear-resistant and low-friction synthetic material,
c)   the intermediate shaft (21) is detachably but positively coupled to the motor shaft (24),
d)   an intermediate sleeve (18) made of a wear-resistant and low-friction synthetic material is slid onto the intermediate shaft, which sleeve centres the intermediate shaft at the motor bearing shield (39) and supports the intermediate shaft at an intermediate bearing arrangement (20) between the positive coupling (38) and the pump wheel (23),
e)   the pump wheel (23) is removable and is not mounted before assembly.

2. A pump device as claimed in Claim 1, characterised in that the intermediate bearing arrangement (20) is constructed to take up the transverse forces exerted on the intermediate shaft (21) by the pump wheel (23).
3. A pump device as claimed in Claim 1 or 2, characterised in that the shaft arrangement (17) comprising the intermediate shaft (21) and the intermediate sleeve (18) can be mounted from the top in a cover wall (6) mounted in the receptacle cover (4) of the receptacle.
4. A pump device as claimed in any one or several of the Claims 1 to 3, characterised in that the motor (14) is secured to the cover wall (6) by means of a snap spring (27) and thereby locates the intermediate shaft (21) and the intermediate sleeve (18).
5. A pump device as claimed in Claim 1, characterised in that the pump wheel (23) is symmetrical and is made of an elastic synthetic material, the wheel having in its centre a recess (40) for receiving the intermediate shaft (21), which recess has different dimensions in two mutually perpendicular directions, and the end of the intermediate shaft (21) to be inserted into the recess is shaped accordingly to guarantee a positive coupling with the pump wheel (23).
6. A pump device as claimed in Claim 5, characterised in that the recess (40) and the insertion end of the intermediate shaft (21) have a flat shape.
7. A pump device as claimed in Claim 6 or 7, characterised in that the head (31) of the insertion end of the intermediate shaft is toric.
8. A pump device as claimed in Claim 7, characterised in that the pump wheel (23) can be locked on the insertion end of the intermediate shaft (21) over the toric head (31).
9. A pump device as claimed in Claim 1, characterised in that the upper wall (10) of the pump chamber (11) tapers upwardly towards the intermediate shaft (21), and an annular opening (35) around the intermediate shaft (21) is dimensioned so as to guarantee venting of the pump chamber (11) through the annular opening (35).
EP88202779A 1987-12-11 1988-12-05 Pump device for low-viscosity liquids Expired - Lifetime EP0320061B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873741978 DE3741978A1 (en) 1987-12-11 1987-12-11 PUMPING DEVICE FOR LIGHT VISCOSE LIQUIDS
DE3741978 1987-12-11

Publications (3)

Publication Number Publication Date
EP0320061A2 EP0320061A2 (en) 1989-06-14
EP0320061A3 EP0320061A3 (en) 1990-01-24
EP0320061B1 true EP0320061B1 (en) 1991-10-16

Family

ID=6342345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202779A Expired - Lifetime EP0320061B1 (en) 1987-12-11 1988-12-05 Pump device for low-viscosity liquids

Country Status (3)

Country Link
EP (1) EP0320061B1 (en)
DE (2) DE3741978A1 (en)
ES (1) ES2027757T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104265647A (en) * 2014-07-31 2015-01-07 苏州淮通电气有限公司 Wear-resistant and impact-resistant submersible pump

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29606135U1 (en) * 1996-04-02 1996-08-22 Speck Pumpenfabrik Walter Spec Galvanically isolated pump
TWM263435U (en) * 2004-05-28 2005-05-01 Liung Feng Ind Co Ltd Co-axial power system
DE102010003580A1 (en) * 2010-04-01 2011-10-06 BSH Bosch und Siemens Hausgeräte GmbH Domestic appliance for the treatment of laundry
CN103454183A (en) * 2013-09-14 2013-12-18 苏州多贝机械科技有限公司 Portable fluorocarbon paint viscometer
CN106015120A (en) * 2014-07-31 2016-10-12 丁永新 Wear-resisting impact-resisting jet vacuum pump
CN106122095A (en) * 2014-07-31 2016-11-16 充梦霞 Use the wear-resisting jet vacuum pump of ceramic body

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US3072062A (en) * 1961-04-17 1963-01-08 Little Giant Corp Liquid pump
DE2407109C2 (en) * 1974-02-14 1975-04-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Pump device for liquids
DE7623892U1 (en) * 1976-07-29 1977-01-27 Tunze, Norbert, 8122 Penzberg CENTRIFUGAL PUMP

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104265647A (en) * 2014-07-31 2015-01-07 苏州淮通电气有限公司 Wear-resistant and impact-resistant submersible pump
CN104265647B (en) * 2014-07-31 2016-11-09 苏州海而仕信息科技有限公司 Abrasion-resistant and impact-resistant submersible pump

Also Published As

Publication number Publication date
DE3865645D1 (en) 1991-11-21
ES2027757T3 (en) 1992-06-16
EP0320061A2 (en) 1989-06-14
EP0320061A3 (en) 1990-01-24
DE3741978A1 (en) 1989-06-22

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