EP0017829A1 - Centrifugal pump and its housing - Google Patents

Centrifugal pump and its housing Download PDF

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Publication number
EP0017829A1
EP0017829A1 EP80101683A EP80101683A EP0017829A1 EP 0017829 A1 EP0017829 A1 EP 0017829A1 EP 80101683 A EP80101683 A EP 80101683A EP 80101683 A EP80101683 A EP 80101683A EP 0017829 A1 EP0017829 A1 EP 0017829A1
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EP
European Patent Office
Prior art keywords
rotor
shaft
pump
pump according
worm gear
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Granted
Application number
EP80101683A
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German (de)
French (fr)
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EP0017829B1 (en
Inventor
Arthur Milz
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Individual
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Individual
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Priority to AT80101683T priority Critical patent/ATE7946T1/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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
    • E04D13/08—Down pipes; Special clamping means therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal

Definitions

  • the invention relates to a centrifugal pump, in particular one with a rotor, which is accommodated in a working space which is provided in order to be at least partially immersed in the liquid to be conveyed.
  • a centrifugal pump in particular one with a rotor
  • Such pumps are known in large numbers and serve a wide variety of purposes, from pumping out the groundwater to lifting chemicals from drums and other vessels. Since this type of flooded pump with a drive motor generally arranged above the liquid level usually consists of a few parts, places little demands on the seals and is accordingly low-maintenance, it is used above all where either dirty or aggressive media are to be pumped, and also where cheapness of manufacture and extremely long, trouble-free operation are important. Both require an acceptable level of efficiency with a relatively low number of revolutions, such as that provided by a shaded-pole motor coupled directly to the shaft of the impeller cheaply and reliably.
  • the aim of the invention is to create a pump of the type mentioned at the outset which avoids these disadvantages and at the same time can be built as compactly as possible.
  • the invention proposes a centrifugal pump with a rotor rotating in a work space, which is characterized in that this space is connected to the outlet line of the pump by a worm gear beginning at one end thereof, a first section of the worm gear forming an opening, which is too open to the side of the working area and the worm gear, as seen in the direction of flow, winds around the axis of rotation of the rotor with a progressively smaller radius and an increasingly greater pitch.
  • both the outlet line of the pump and its connection to the work space lie entirely within the clear width of the work space determined parallel to the axis of rotation.
  • FIG. 1 denotes a substantially cylindrical base body or stator, for example made of plastic, on the upper end of which a pressure line 2 and a guide tube 4 containing the drive shaft 3 are screwed.
  • a pressure line 2 and a guide tube 4 containing the drive shaft 3 are screwed.
  • an electric motor (not shown) attacks while the lower end of the rotor 5 is applied.
  • the direction of rotation of the same is indicated by the arrow F in FIG. 2.
  • the lower bearing of the shaft 3 is formed by its passage through the stator; since this bearing is lubricated by the liquid to be pumped, it can have a relatively large clearance, for example 3/10 mm.
  • the liquid contained therein can optionally also be placed under a slight excess pressure.
  • the rotor 5 forms an impeller with four flat blades 6, which are parallel to the shaft 3 and which are fastened to an overhead, round base plate 7. At their lower, outer periphery of the wings 6 are at an angle ⁇ of about 30 ° - 50 0 chamfered.
  • a helical passage 8 is recessed, which - seen in the direction of flow, that is, in the direction of arrow G - leads from the periphery of the working space surrounding the impeller to the pressure line 2.
  • the radius of the screw, measured from shaft 3, progressively decreases, while at the same time the pitch of the screw parallel to shaft 3 increases progressively until it becomes infinite at the upper mouth of the screw flight, so that it goes into line 2 parallel to the shaft without kinks transforms.
  • this passage if it is milled out of the base body, will be open to the outside, ie, below point L in FIG. 1, it will only be closed radially outwards when the sleeve 9 provided in this embodiment surrounds the base body .
  • This sleeve also limits the working space surrounding the impeller and occasionally forms the intake port 10 of the pump. It can also, in a manner not shown, be extended upwards and be designed as a support tube for the whole pump.
  • Other manufacturing processes can the aisle, however, from its outlet opening in the pressure line 2 to its opposite junction in the periphery of the work space, be enclosed on all sides in the base body. In the lower mouth area, the course of which can be seen clearly from FIG.
  • the part of the passage cut out of the base body tapers and forms only a tapering channel. If one imagines this to be a passageway with a reasonably constant cross-section, then this would ultimately lie almost entirely in the work space from which the helical passageway is not separated in its upstream estuary. In this part, which is open on the side, along with the depth of the gutter recessed from the base body, the incline of the corridor, which was thought to be the full cross section, drops to almost zero. This open part, which in FIG. 2 extends almost over 360 °, will preferably not extend over less than about 180 °, and will flow evenly into the work area. Likewise, the whole aisle should of course be as free of kinks as possible. On the other hand, the presence of a base body is not necessary, since the passage can also be formed, for example, by a suitably fastened tube which is wound into a screw.
  • the sleeve 9 made of sheet metal in the described embodiment is pushed over the base body and fastened to it. It is constricted at point 11, at the same angle as the impeller. Below it, it expands again and carries an intake filter 12 at its lower end 10.
  • the sleeve on the constriction 11 is closed on the end face, as indicated by the dash-dotted line A.
  • the suction can then take place through one or more through bores in the base body, which connect the working space with the outside space around the pump, without to touch the snail gear.
  • Such a bore is shown in dash-dotted lines in FIG. 2 and is designated by B.
  • the suction on the top of the stator that this enables can be advantageous.
  • FIG. 3 shows a section of the shaft 3 leading from the impeller 5 to the drive motor (not shown). This is guided loosely, for example with a play of 1/2 mm, in the guide tube 4.
  • the space 13 between the shaft and the tube will be at least partially filled with the liquid to be pumped during operation of the pump, due to the excess pressure existing in the upper part of the working space and the aforementioned loose mounting of the shaft in the base body.
  • the pressure of the liquid in the intermediate space 13 can be achieved by attaching a pressure passage D (FIGS.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

The disclosure relates to a rotary pump especially for corrosive liquids including an impeller rotating in a working chamber. A spirally wound duct leads from one surface of the working chamber to the outlet pipe of the pump. The upstream end of the duct obliquely enters the working chamber, whereby the end portion of the duct is laterally open towards the chamber and forms a channel in the wall of the chamber. The duct winds helically around the rotation axis of the impeller, having an inside wall at a progressively decreasing radial distance from said rotation axis and a progressively increasing pitch when viewed in the direction of the flow. A feature is the provision of the wound duct in the form of a helix as an open groove formed on the outer surface of a solid stator body and closed by an encompassing casing. A further feature is the provision of a relatively loose, elongated drive shaft from a motor to the pump impeller disposed within a guide tube and a circumferential clearance between the shaft and the tube for leakage flow of liquid being pumped to lubricate the shaft wherein a bypass port is provided in the guide tube for return of the leakage flow upstream of a restriction in the clearance. The restriction increases pressure in the clearance to dampen lateral oscillation of the shaft in the tube. No seals are used for the shaft thereby precluding the tendency of seals to stick during prolonged rest periods.

Description

Die Erfindung betrifft eine Kreiselpumpe, insbesondere eine solche mit einem Rotor, der in einem Anbeitsraum untergebracht ist, welcher vorgesehen ist, um mindestens teilweise in der zu fördernden Flüssigkeit eingetaucht zu werden. Solche Pumpen sind in grosser Anzahl bekannt und dienen den verschiedensten Zwecken, vom Auspumpen des Grundwassers bis zum Heben von Chemikalien aus Fässern und anderen Gefässen. Da diese Art von überfluteter Pumpe mit im allgemeinen oberhalb des Flüssigkeitsspiegels angeordnetem Antriebsmotor meist aus wenigen Teilen besteht, geringe Ansprüche an die Dichtungen stellt und entsprechend wartungsarm ist, wird sie vor allem dort eingesetzt, wo entweder verschmutzte oder aggressive Medien gepumpt werden sollen, und auch dort, wo Billigkeit der Herstellung und äusserst lange störungsfreie Petriebsdauer wichtig sind. Beides erfordert einen annehmbaren Wirkungsgrad bei einer verhältnismässig niederen Tourenzahl, wie sie beispielsweise ein direkt an die Welle des Flügelrades angekoppelter Spaltpolmotor billig und zuverlässig liefern kann.The invention relates to a centrifugal pump, in particular one with a rotor, which is accommodated in a working space which is provided in order to be at least partially immersed in the liquid to be conveyed. Such pumps are known in large numbers and serve a wide variety of purposes, from pumping out the groundwater to lifting chemicals from drums and other vessels. Since this type of flooded pump with a drive motor generally arranged above the liquid level usually consists of a few parts, places little demands on the seals and is accordingly low-maintenance, it is used above all where either dirty or aggressive media are to be pumped, and also where cheapness of manufacture and extremely long, trouble-free operation are important. Both require an acceptable level of efficiency with a relatively low number of revolutions, such as that provided by a shaded-pole motor coupled directly to the shaft of the impeller cheaply and reliably.

Da die eingangs genannte Art von Pumpen sich besonders zur Verwendung als in einen Behälter, absenkbare. sogenannte Fasspumpen eignet, ist es auch erwünscht, die Aussenabmessung des Pumpenkörpers möglichst klein zu halten, damit die Pumpe durch eine enge Oeffnung in einen Pehälter gesenkt werden kann.Since the type of pumps mentioned at the outset is particularly suitable for use as a container, lowerable. Suitable so-called barrel pumps, it is also desirable to keep the outer dimension of the pump body as small as possible so that the pump can be lowered into a container by a narrow opening.

Es existieren sehr einfache Pumpen dieser Art, wie etwa in den Schweizer Patentschriften Nrn. 95.098 oder 444.673 beschrieben, bei welchen der Pumpenkörper aber verhältnismässig sperrig ist. Andere bekannte Ausführungen. wie etwa diejenigen der Schweizer Patentschriften Nrn. 243.663, 450.925 oder 599.467 sind wiederum ziemlich aufwendig in der Konstruktion und verlangen insbesondere gut wirkende Dichtungen und spielfreie Lager.Very simple pumps of this type exist, as described for example in Swiss Patent Nos. 95.098 or 444.673, in which the pump body is relatively bulky. Other known designs. such as those of Swiss Patent Nos. 243,663, 450,925 or 599,467 are again quite complex to construct and are particularly demanding effective seals and play-free bearings.

Es ist das Ziel der Erfindung, eine Pumpe der eingangs genannten Art zu schaffen, welche diese Nachteile vermeidet und gleichzeitig möglichst kompakt gebaut werden kann.The aim of the invention is to create a pump of the type mentioned at the outset which avoids these disadvantages and at the same time can be built as compactly as possible.

Zu diesem Zweck schlägt die Erfindung eine Kreiselpumpe mit in einem Arbeitsraum drehendem Rotor vor, welche dadurch gekennzeichnet ist, dass dieser Raum durch einen an einer Stirnseite desselben beginnenden Schneckengang mit der Ausgangsleitung der Pumpe verbunden ist, wobei ein erster Abschnitt des Schneckenganges eine Mündung bildet, die seitlich gegen den Arbeitsraum zu offen ist und sich der Schneckengang in Strömungsrichtung gesehen mit progressiv kleiner werdendem Radius und zunehmend grösserer Steigung um die Drehachse des Rotors windet. In einer anderen Ausführung liegen sowohl die Ausgangsleitung der Pumpe wie deren Verbindung mit dem Arbeitsraum gänzlich innerhalb der parallel zur Rotationsachse bestimmten lichten Weite des Arbeitsraumes.For this purpose, the invention proposes a centrifugal pump with a rotor rotating in a work space, which is characterized in that this space is connected to the outlet line of the pump by a worm gear beginning at one end thereof, a first section of the worm gear forming an opening, which is too open to the side of the working area and the worm gear, as seen in the direction of flow, winds around the axis of rotation of the rotor with a progressively smaller radius and an increasingly greater pitch. In another embodiment, both the outlet line of the pump and its connection to the work space lie entirely within the clear width of the work space determined parallel to the axis of rotation.

Im folgenden soll die Erfindung anhand von Varianten eines bevorzugten Ausführungsbeispieles näher erläutert werden.The invention will be explained in more detail below with the aid of variants of a preferred exemplary embodiment.

Es zeigt:

  • Fig. l eine teilweise geschnittene Ansicht der Pumpe,
  • Fig. 2 eine Ansicht des Grundkörpers der Fig. 1 von unten, und
  • Fig. 3 einen Abschnitt der Antriebswelle samt ihrer Führung.
It shows:
  • 1 is a partially sectioned view of the pump,
  • Fig. 2 is a view of the base body of FIG. 1 from below, and
  • Fig. 3 shows a portion of the drive shaft with its guide.

In der Fig. l bezeichnet 1 einen, beispielsweise aus Kunststoff gefertigten, im wesentlichen zylindrischen Grundkörper oder Stator, an dessen oberer Stirnseite eine Druckleitung 2 und ein die Antriebswelle 3 enthaltendes Führungsrohr 4 eingeschraubt sind. Am oberen Ende der Welle 3 greift ein (nicht gezeigter) Elektromotor an, während an ihrem unteren Ende der Rotor 5 aufgebracht ist. Der Drehsinn desselben ist durch den Pfeil F der Fig. 2 angedeutet. Das untere Lager der Welle 3 wird durch ihren Durchgang durch den Stator gebildet; da dieses Lager durch die zu pumpende Flüssigkeit geschmiert ist, kann es ein relativ grosses Spiel, von beispielsweise 3/10 mm aufweisen. Wie weiter unten beschrieben, kann die darin befindliche Flüssigkeit wahlweise auch unter leichten Ueberdruck gesetzt werden.In FIG. 1, 1 denotes a substantially cylindrical base body or stator, for example made of plastic, on the upper end of which a pressure line 2 and a guide tube 4 containing the drive shaft 3 are screwed. At the upper end of the shaft 3, an electric motor (not shown) attacks while the lower end of the rotor 5 is applied. The direction of rotation of the same is indicated by the arrow F in FIG. 2. The lower bearing of the shaft 3 is formed by its passage through the stator; since this bearing is lubricated by the liquid to be pumped, it can have a relatively large clearance, for example 3/10 mm. As described further below, the liquid contained therein can optionally also be placed under a slight excess pressure.

Der Rotor 5 bildet in der beschriebenen einfachen Ausführung ein Flügelrad mit vier ebenen, parallel zur Welle 3 liegenden Flügeln 6, welche an einer obenliegenden, runden Grundscheibe 7 befestigt sind. An ihren unteren, äusseren Umfang sind die Flügel 6 unter einem Winkel α von etwa 30° - 500 abgeschrägt.In the simple embodiment described, the rotor 5 forms an impeller with four flat blades 6, which are parallel to the shaft 3 and which are fastened to an overhead, round base plate 7. At their lower, outer periphery of the wings 6 are at an angle α of about 30 ° - 50 0 chamfered.

Im Stator 1 ist ein schneckenförmiger Gang 8 ausgegespart, welcher - in Strömungsrichtung gesehen, das heisst in Richtung des Pfeiles G - von der Peripherie des das Flügelrad umgebenden Arbeitsraumes zur Druckleitung 2 führt. Dabei nimmt der von der Welle 3 aus gemessene Radius der Schnecke progressiv ab, während gleichzeitg die Steigung der Schnecke parallel zur Welle 3 progressiv zunimmt, bis sie an der oberen Mündung des Schneckenganges unendlich wird, so dass dieser knickfrei in die zur Welle parallele Leitung 2 übergeht.In the stator 1, a helical passage 8 is recessed, which - seen in the direction of flow, that is, in the direction of arrow G - leads from the periphery of the working space surrounding the impeller to the pressure line 2. The radius of the screw, measured from shaft 3, progressively decreases, while at the same time the pitch of the screw parallel to shaft 3 increases progressively until it becomes infinite at the upper mouth of the screw flight, so that it goes into line 2 parallel to the shaft without kinks transforms.

Aus fertigungstechnischen Gründen wird dieser Gang, sofern er aus dem Grundkörper ausgefräst ist, nach aussen hin offen sein, d.h. unterhalb des Punktes L in Fig. 1 erst dann radial nach aussen hin abgeschlossen sein, wenn die in dieser Ausführung vorgesehene Hülse 9 den Grundkörper umgibt. Diese Hülse begrenzt auch den das Flügelrad umgebenden Arbeitsraum und bildet fallweise den Ansaugstutzen 10 der Pumpe. Sie kann auch, in nicht gezeigter Weise, nach oben hin verlängert und als Tragrohr für di.e ganze Pumpe ausgebildet sein. Bei anderen Herstellungsverfahren kann der Gang aber auch von seinem in die Druckleitung 2 mündenden Ausgang bis zu seiner entgegengesetzten Einmündung in die Peripherie des Arbeitsraumes, allseitig im Grundkörper eingeschlossen sein. Im unteren Mündungsgebiet, dessen Verlauf gut aus der Fig. 2 zu ersehen ist, verjüngt sich der aus dem Grundkörper ausgenommene Teil des Ganges und bildet nur noch eine auslaufende Rinne. Wenn man sich diese zu einem Gang mit einigermassen konstantem Querschnitt ergänzt vorstellt, dann würde dieser schliesslich fast ganz im Arbeitsraum liegen, von welchem der schneckenförmige Gang in seinem stromaufwärts liegenden Mündungsgebiet nicht getrennt ist. In diesem seitlich offenen Teil sinkt, zusammen mit der Tiefe der aus dem Grundkörper ausgenommenen Rinne auch die Steigung des zu seinem vollen Ouerschnitt ergänzt gedachten Ganges auf nahezu Null. Dieser offene Teil, der sich in Fig. 2 fast über 360° erstreckt, wird sich vorzugsweise nicht über weniger als etwa 180° erstrekken, und gleichmässig in den Arbeitsraum auslaufen. Desgleichen sollte natürlich der ganze Gang einen möglichst knickfreien Verlauf aufweisen. Andererseits ist das Vorhandensein eines Grundkörpers nicht notwendig, da der Gang z.B. auch durch ein geeignet befestigtes, zu einer Schnecke gewundenes Rohr gebildet werden kann.For manufacturing reasons, this passage, if it is milled out of the base body, will be open to the outside, ie, below point L in FIG. 1, it will only be closed radially outwards when the sleeve 9 provided in this embodiment surrounds the base body . This sleeve also limits the working space surrounding the impeller and occasionally forms the intake port 10 of the pump. It can also, in a manner not shown, be extended upwards and be designed as a support tube for the whole pump. Other manufacturing processes can the aisle, however, from its outlet opening in the pressure line 2 to its opposite junction in the periphery of the work space, be enclosed on all sides in the base body. In the lower mouth area, the course of which can be seen clearly from FIG. 2, the part of the passage cut out of the base body tapers and forms only a tapering channel. If one imagines this to be a passageway with a reasonably constant cross-section, then this would ultimately lie almost entirely in the work space from which the helical passageway is not separated in its upstream estuary. In this part, which is open on the side, along with the depth of the gutter recessed from the base body, the incline of the corridor, which was thought to be the full cross section, drops to almost zero. This open part, which in FIG. 2 extends almost over 360 °, will preferably not extend over less than about 180 °, and will flow evenly into the work area. Likewise, the whole aisle should of course be as free of kinks as possible. On the other hand, the presence of a base body is not necessary, since the passage can also be formed, for example, by a suitably fastened tube which is wound into a screw.

Die in der beschriebenen Ausführung aus Blech bestehende Hülse 9 ist über den Grundkörper geschoben und daran befestigt. Sie ist an der Stelle 11, unter demselben Winkel wie das Flügelrad eingeschnürt. Darunter erweitert sie sich wieder und trägt an ihrem unteren Ende 10 einen Ansaugfilter 12.The sleeve 9 made of sheet metal in the described embodiment is pushed over the base body and fastened to it. It is constricted at point 11, at the same angle as the impeller. Below it, it expands again and carries an intake filter 12 at its lower end 10.

In einer anderen, nur angedeuteten und nicht getrennt gezeigten Variante ist die Hülse an der Einschnürung 11 stirnseitig geschlossen, wie durch die strichpunktierte Linie A angedeutet. Das Ansaugen kann dann durch eine oder mehrere durchgehende Bohrungen im Grundkörper erfolgen, welche den Arbeitsraum mit dem Aussenraum um die Pumpe herum verbinden, ohne
den Schneckengang zu berühren. In der Fig. 2 ist eine solche Bohrung strichpunktiert gezeigt und mit B bezeichnet. Für gewisse Anwendungen kann das damit ermöglichte Ansaugen an der Oberseite des Stators von Vorteil sein.In another variant, only indicated and not shown separately, the sleeve on the constriction 11 is closed on the end face, as indicated by the dash-dotted line A. The suction can then take place through one or more through bores in the base body, which connect the working space with the outside space around the pump, without
to touch the snail gear. Such a bore is shown in dash-dotted lines in FIG. 2 and is designated by B. For certain applications, the suction on the top of the stator that this enables can be advantageous.

Die Fig. 3 zeigt einen Abschnitt der vom Flügelrad 5 zum (nicht gezeigten) Antriebsmotor führenden Welle 3. Diese wird lose, beispielsweise mit einem Spiel von 1/2 mm, im Führungsrohr 4 geführt. Der Zwischenraum 13 zwischen Welle und Rohr wird beim Betrieb der Pumpe, infolge des im oberen Teil des Arbeitsraumes bestehenden Ueberdruckes und der erwähnten losen Lagerung der Welle im Grundkörper, mindestens teilweise mit der zu fördernden Flüssigkeit angefüllt sein. Um diese besser zur Dämpfung, eines eventuellen Schlagens und Schwingens der oft ziemlich langen und möglichst leicht ausgeführten Welle auszunützen, kann der Druck der Flüssigkeit im Zwischenraum 13 durch Anbringen einer Durckdurchführung D (Fig. 1 und 2), welche eine Stelle hohen Druckes im Schneckendurchgang mit dem die Welle umgebenden Raum verbindet, erhöht werden, Um ein Ansteigen der oft korrosiven Flüssigkeit bis zum Motor zu vermeiden, ohne eigentliche Dichtungen zu verwenden - welche bei längerem Nichtgebrauch zum Festsitzen neigen - wird mit Vorteil im oberen Teil des Fuhrungsrohres 4 eine strömungshemmende Schikane 4 vorgesehen und das Führungsrohr selbst oberhalb derselben mit einer Rückflussöffnung 15 versehen. Das Spiel zwischen Welle und Schikane kann beispielsweise Das zwischen Welle und Schikane kann beispielsweise etwa 0,2 mm betragen, was genügt, um im darunterliegenden Zwischenraum einen erhöhten, schlagdämpfenden Ueberdruck entstehen zu lassen. Die restliche nach oben durchtretende Flüssigkeit fliesst dann durch die Oeffnung 15 zurück, und der weiter oben liegende Motor braucht nicht durch zusätzliche Dichtungen geschützt zu werden, so dass der ganze Pumpenaufbau weder von der zu fördernden Flüssigkeit beaufschlagte Dichtungen, noch eigentliche - d.h. im wesentli- chen spielfreie - Lager aufweist, was unter anderem die durchgehende Verwendung spröder, chemikalienfester Materialien, wie etwa Glas, erlaubt. Falls die Dichtungsfreiheit nicht den Vorrang hat, kann die hier der Klarheit halber nur in der Vertikallage beschriebene Pumpe natürlich bei jeder beliebigen Orientierung im Raum betrieben werden.FIG. 3 shows a section of the shaft 3 leading from the impeller 5 to the drive motor (not shown). This is guided loosely, for example with a play of 1/2 mm, in the guide tube 4. The space 13 between the shaft and the tube will be at least partially filled with the liquid to be pumped during operation of the pump, due to the excess pressure existing in the upper part of the working space and the aforementioned loose mounting of the shaft in the base body. In order to better utilize this for damping, eventual beating and swinging of the often rather long and lightest possible shaft, the pressure of the liquid in the intermediate space 13 can be achieved by attaching a pressure passage D (FIGS. 1 and 2), which is a point of high pressure in the screw passage with the space surrounding the shaft can be increased to avoid rising of the often corrosive liquid up to the motor without using actual seals - which tend to stick if not used for a long time - will advantageously be a flow-inhibiting baffle in the upper part of the guide tube 4 4 is provided and the guide tube itself is provided with a backflow opening 15 above it. The play between the shaft and the chicane, for example, that between the shaft and the chicane can be, for example, about 0.2 mm, which is sufficient to allow an increased, shock-absorbing excess pressure to arise in the space below. The rest of the liquid that flows upward then flows back through the opening 15, and the motor located further up does not need to be protected by additional seals, so that the entire pump structure does not have any seals that are acted upon by the liquid to be pumped, nor are actual seals, ie essentially Chen play-free - bearing, which among other things continuous use of brittle, chemical-resistant materials such as glass allowed. If the freedom from sealing is not a priority, the pump described here only in the vertical position can of course be operated with any orientation in the room for the sake of clarity.

Claims (11)

1. Kreiselpumpe mit in einem Arbeitsraum rotierendem Rotor, dadurch gekennzeichnet, dass dieser Raum durch einen an einer Stirnseite desselben beginnenden Schneckengang mit der Ausgangsleitung der Pumpe verbunden ist, wobei ein erster Abschnitt des Schneckenganges eine Mündung bildet, die seitlich gegen den Arbeitsraum zu offen ist, und sich der Schneckengang in Strömungsrichtung gesehen mit progressiv kleiner werdendem Radius und zunehmend grösserer Steigung um die Drehachse des Rotors windet.1. Centrifugal pump with a rotor rotating in a work space, characterized in that this space is connected to the output line of the pump by a worm gear beginning at the end thereof, a first section of the worm gear forming an opening that is too open to the side of the work space , and the worm gear, seen in the direction of flow, winds around the axis of rotation of the rotor with a progressively smaller radius and increasingly larger pitch. 2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass der erste Teil des Schneckenganges an die Mantelfläche des Arbeitsraumes angrenzt, und dass sich sein offener Mündungsteil über mindestens 180° erstreckt.2. Pump according to claim 1, characterized in that the first part of the screw flight adjoins the outer surface of the working space, and that its open mouth part extends over at least 180 °. 3. Pumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der offene Mündungsteil des Schneckenganges durch eine Rinne mit in Strömungsrichtung gesehen progressiv zunehmendem Ouerschnitt gebildet wird.3. Pump according to one of the preceding claims, characterized in that the open mouth part of the screw flight is formed by a channel with a progressively increasing cross section as seen in the flow direction. 4. Pumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Rotor an seiner dem Schneckengang zugekehrten Seite eine quer zu seiner Drehachse liegende Platte aufweist, welche den offenen Mündungsteil des Schneckenganges teilweise abdeckt.4. Pump according to one of the preceding claims, characterized in that the rotor on its side facing the worm gear has a plate lying transversely to its axis of rotation, which partially covers the open mouth part of the worm gear. 5. Pumpe nach einem der vorangehenden Ansprüche, gekernzeichnet durch einen von einer Hochdruckstelle im Schneckengang zu dem, die Antriebswelle des Rotors umgebenden Raum führenden Durchgang.5. Pump according to one of the preceding claims, core characterized by a passage leading from a high-pressure point in the worm gear to the space surrounding the drive shaft of the rotor. 6. Pumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Antriebswelle des Rotors lose in einem Führungsrohr geführt ist, das mit einem Flüssigkeitsaustrittsloch versehen ist.'6. Pump according to one of the preceding claims, characterized in that the drive shaft of the rotor is loosely guided in a guide tube which is provided with a liquid outlet hole. ' 7. Pumpe nach Anspruch 6, dadurch gekennzeichnet, dass der zylindrische Spalt zwischen Welle und Führungsrohr in der Nähe des Loches eine Verengung aufweist.7. Pump according to claim 6, characterized in that the cylindrical gap between the shaft and the guide tube in the vicinity of the hole has a constriction. 8. Kreiselpumpe mit in einem Arbeitsraum rotierendem Rotor, gekennzeichnet durch eine im wesentlichen zur Drehachse des Rotors narallelen Ausgangsleitung sowie durch einen diese Leitung mit dem Arbeitsraum verbindenden Schnekkengang, welcher gänzlich innerhalb der parallel zur Drehachse bestimmten lichten Weite des Arbeitsraumes liegt.8. Centrifugal pump with a rotating rotor in a work area, characterized by an output line essentially parallel to the axis of rotation of the rotor and by a screw passage connecting this line to the work area, which lies entirely within the clear width of the work area determined parallel to the axis of rotation. 9. Pumpe nach Anspruch 8, dadurch gekennzeichnet, dass der Gang an einer Stirnseite des Arbeitsraumes mündet und sich dieser über mindestens einen Teil seiner Länge gegen die andere Stirnseite hin verengt.9. Pump according to claim 8, characterized in that the passage opens at one end of the working space and this narrows over at least part of its length towards the other end. 10. Pumpe nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der Rotor ein Flügelrad ist, und dass die radial aussenliegenden Kanten seiner Flügel im wesentlichen parallel zur Mantelfläche des Arbeitsraumes verlaufen.10. Pump according to claim 8 or 9, characterized in that the rotor is an impeller, and that the radially outer edges of its wings extend substantially parallel to the outer surface of the working space. 11. Rumme nach Anspruch 8, dadurch gekennzeichnet, dass der Roton auf seiner dem Gang zugekehrten Seite eine Platte aufweist, welche die Mündung des Ganges in den Arbeitsnaum teilweise überdeckt.11. Rumme according to claim 8, characterized in that the Roton on its side facing the aisle has a plate which partially covers the mouth of the aisle in the working area.
EP80101683A 1979-04-09 1980-03-28 Centrifugal pump and its housing Expired EP0017829B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101683T ATE7946T1 (en) 1979-04-09 1980-03-28 CENTRIFUGAL PUMP AND ITS HOUSING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH332779A CH643918A5 (en) 1979-04-09 1979-04-09 CENTRIFUGAL PUMP.
CH3327/79 1979-04-09

Publications (2)

Publication Number Publication Date
EP0017829A1 true EP0017829A1 (en) 1980-10-29
EP0017829B1 EP0017829B1 (en) 1984-06-13

Family

ID=4253569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101683A Expired EP0017829B1 (en) 1979-04-09 1980-03-28 Centrifugal pump and its housing

Country Status (8)

Country Link
US (1) US4349311A (en)
EP (1) EP0017829B1 (en)
JP (1) JPS55139998A (en)
AT (1) ATE7946T1 (en)
CH (1) CH643918A5 (en)
DE (1) DE3013138A1 (en)
DK (1) DK148105C (en)
NO (1) NO151979C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516987A1 (en) * 1981-11-23 1983-05-27 Peugeot Water pump for IC engine - has helically grooved plug in discharge chamber to connect to outlet branch
EP0443354A1 (en) * 1990-02-21 1991-08-28 KSB Aktiengesellschaft Centrifugal pump

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4448573A (en) * 1982-03-25 1984-05-15 General Electric Company Single-stage, multiple outlet centrifugal blower
DE3814721A1 (en) * 1988-04-30 1989-11-09 Asea Brown Boveri RADIAL FAN WITH INTEGRATED DIRT SEPARATOR
CN103016361B (en) * 2012-12-12 2015-05-13 君禾泵业股份有限公司 Low-water-sucking water pump

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR831864A (en) * 1937-04-15 1938-09-15 Neu Sa Further development of axial-centrifugal fans
GB673062A (en) * 1947-12-31 1952-06-04 Sfindex Improvements in guiding means for annular flow of fluids
US2618223A (en) * 1948-10-21 1952-11-18 Ransohoff Inc N Centrifugal pump housing
DE1026475B (en) * 1955-02-24 1958-03-20 Realisations Ind Fournier & Mo Semi-axial fan with an axially radial outlet spiral and with a tapered impeller hub
DE1155677B (en) * 1960-01-14 1963-10-10 Ernst Van Gerfsheim Self-priming centrifugal pump for dirt and waste water with a filling and ventilation chamber located below the pressure port
GB986339A (en) * 1963-12-22 1965-03-17 Robert Mortimer Penney Centrifugal pump
CH450925A (en) * 1965-07-30 1968-05-15 Flux Geraete Gmbh Pump, especially barrel pump
FR2169496A5 (en) * 1972-01-28 1973-09-07 Sodery
GB1406827A (en) * 1972-11-08 1975-09-17 Reid K D Mounting of rotatable impeller shafts
CH599467A5 (en) * 1973-02-13 1978-05-31 Siemens Ag
NL7708887A (en) * 1977-08-11 1979-02-13 Stork Koninklijke Maschf Pump with axial flow impeller - has tangential branch on housing above impeller forming outlet

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11544A (en) * 1854-08-22 William
US406394A (en) * 1889-07-02 Joseph j
US976565A (en) * 1909-11-22 1910-11-22 El Campo Machine Company Well-pumping mechanism.
CH95098A (en) * 1921-05-09 1922-06-16 Bucher Guyer J Centrifugal slurry pump.
FR676564A (en) * 1929-06-12 1930-02-25 Fan
US2007856A (en) * 1934-03-16 1935-07-09 Haldeman James Fred Fountain
US2331641A (en) * 1941-01-21 1943-10-12 Jack E Walker Shaft sealing means for pumps
CH243663A (en) * 1944-12-16 1946-07-31 Flueck Hans Centrifugal pump.
US2445182A (en) * 1946-11-01 1948-07-13 Deming Co Means for connecting a driving motor to the shaft of a rotary pump
US2910946A (en) * 1953-01-17 1959-11-03 Ask Emil Julius Pumps
US2930325A (en) * 1958-05-09 1960-03-29 William D Beard Elevated discharge sump pump
GB1041935A (en) * 1964-08-31 1966-09-07 Miklos Patay Improvements in centrifugal pumps
GB1352209A (en) * 1971-11-30 1974-05-08 Bp Chem Int Ltd Submersible pump

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR831864A (en) * 1937-04-15 1938-09-15 Neu Sa Further development of axial-centrifugal fans
GB673062A (en) * 1947-12-31 1952-06-04 Sfindex Improvements in guiding means for annular flow of fluids
US2618223A (en) * 1948-10-21 1952-11-18 Ransohoff Inc N Centrifugal pump housing
DE1026475B (en) * 1955-02-24 1958-03-20 Realisations Ind Fournier & Mo Semi-axial fan with an axially radial outlet spiral and with a tapered impeller hub
DE1155677B (en) * 1960-01-14 1963-10-10 Ernst Van Gerfsheim Self-priming centrifugal pump for dirt and waste water with a filling and ventilation chamber located below the pressure port
GB986339A (en) * 1963-12-22 1965-03-17 Robert Mortimer Penney Centrifugal pump
CH450925A (en) * 1965-07-30 1968-05-15 Flux Geraete Gmbh Pump, especially barrel pump
FR2169496A5 (en) * 1972-01-28 1973-09-07 Sodery
GB1406827A (en) * 1972-11-08 1975-09-17 Reid K D Mounting of rotatable impeller shafts
CH599467A5 (en) * 1973-02-13 1978-05-31 Siemens Ag
NL7708887A (en) * 1977-08-11 1979-02-13 Stork Koninklijke Maschf Pump with axial flow impeller - has tangential branch on housing above impeller forming outlet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516987A1 (en) * 1981-11-23 1983-05-27 Peugeot Water pump for IC engine - has helically grooved plug in discharge chamber to connect to outlet branch
EP0443354A1 (en) * 1990-02-21 1991-08-28 KSB Aktiengesellschaft Centrifugal pump

Also Published As

Publication number Publication date
DE3013138A1 (en) 1980-10-23
NO151979B (en) 1985-04-01
CH643918A5 (en) 1984-06-29
JPS55139998A (en) 1980-11-01
DK148105B (en) 1985-03-04
NO801003L (en) 1980-10-10
US4349311A (en) 1982-09-14
DK148105C (en) 1989-11-20
DE3013138C2 (en) 1992-02-13
ATE7946T1 (en) 1984-06-15
DK140280A (en) 1980-10-10
EP0017829B1 (en) 1984-06-13
NO151979C (en) 1985-07-10

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