EP0599333B1 - Rotary Pump - Google Patents

Rotary Pump Download PDF

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Publication number
EP0599333B1
EP0599333B1 EP93119062A EP93119062A EP0599333B1 EP 0599333 B1 EP0599333 B1 EP 0599333B1 EP 93119062 A EP93119062 A EP 93119062A EP 93119062 A EP93119062 A EP 93119062A EP 0599333 B1 EP0599333 B1 EP 0599333B1
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EP
European Patent Office
Prior art keywords
groove
tongue
rotary pump
sealing
sealing strip
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Expired - Lifetime
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EP93119062A
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German (de)
French (fr)
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EP0599333A1 (en
Inventor
Alois Börger
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Individual
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Individual
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084Toothed wheels

Definitions

  • the invention relates to a rotor pump, in particular for the conveyance of liquids containing solids, according to the preamble of claim 1.
  • a rotor pump of the type mentioned is known from DE-AS 18 07 392.
  • the sealing strips are formed from plastic strips inserted into the displacer wing, the plastic strips preferably being inserted with a foot part into a corresponding guide on the displacer wing from the end face thereof.
  • flat disks or strips are attached to the two end faces of the rotor, which also cover the front ends of the sealing strips.
  • the front disks or strips are preferably made of the same material as the sealing strips, so they are elastic and relatively flexible.
  • a disadvantage of this known rotor pump is that the locking of the sealing strips on the displacement blades does not take place reliably because the front disks or strips used for this can only absorb small forces and cannot ensure a secure, displacement-free fit of the sealing strips during pump operation.
  • Another rotor pump is known from DE 37 07 722 A1.
  • An embodiment of this rotor pump provides a tongue and groove connection between the displacer wing and sealing strip.
  • At the outer end of the wing there is a projecting, undercut dovetail spring on which the sealing strip is placed.
  • the sealing strip is connected flat to a metal plate on its side facing the wing.
  • a dovetail groove that exactly matches the tongue is cut into the metal plate and into the lower part of the sealing strip.
  • the sealing strip with the metal plate on the wing is locked here solely by friction forces, which is sufficient for a secure fit if the friction forces are selected to be sufficiently high by appropriate dimensions. However, these high frictional forces make it very difficult to remove a worn sealing strip for the purpose of exchanging it for a new sealing strip.
  • the locking force exerted by the locking means can be changed as required. So for the purpose of insertion and removal of a sealing strip, the clamping wedge can be loosened, as a result of which the sealing strip can be pushed on and pulled off without great effort.
  • the clamping wedge In order to securely fix the sealing strip on the displacer wing, the clamping wedge is brought into its clamping position, whereby any unintentional and harmful displacement of the sealing strip on the displacer wing is excluded. Since the actuating element for the displacement of the clamping wedge is also accessible from the face of the sealing strip, easy access is provided. An opening in the front of the pump housing is therefore sufficient to remove and install one or more sealing strips. This advantageously reduces the time and effort required for the maintenance and repair of the rotor pump.
  • a preferred embodiment provides that the rotor blades are each formed with an undercut groove and the sealing strips are each formed with a spring which is shaped to match the groove and that the clamping wedge is in each case formed as part of the spring.
  • the rotor blades which remain in the pump for a longer operating time, therefore have no moving parts; the moving parts are provided on the sealing strips, which anyway have to be replaced from time to time due to the inevitable wear. This precludes the fact that, for example, the clamping wedge can no longer be displaced due to corrosion caused by aggressively pumped liquids.
  • the clamping wedge is designed as a loose body aligned with the rest of the fixed part of the spring, which rests against the adjacent fixed part of the spring via a pair of inclined surfaces.
  • the locking means do not require any special installation space, but are integrated into the spring of the sealing strip to save space.
  • the sloping surfaces are preferred aligned so that there is a clamping force acting in the radial direction of the rotor.
  • a further development of the invention provides that the fixed part of the spring occupies its central region, as seen in the longitudinal direction of the spring, and that a clamping wedge is aligned on both sides of this fixed part of the spring. This ensures that there is mutual jamming of the tongue and groove both in the front and in the rear area of the groove, which is particularly advantageous in the case of relatively long sealing strips, since the shear forces occurring during pump operation are thereby better distributed. This reduces the risk of shear fractures within the sealing strips, even with high mechanical loads.
  • the invention further proposes that the actuating element for the clamping wedge / the clamping wedges is formed by a screw bolt guided in the axial direction through the sealing strip, which can be screwed into a threaded bore provided in the clamping wedge / in one of the clamping wedges.
  • the head of the screw bolt, on which a suitable actuating tool is to be attached, then lies on the end face of the sealing strip, which enables simple actuation.
  • the head of the screw bolt is expediently countersunk in the sealing strip, i.e. arranged in the fixed part of the spring or when using two clamping wedges per spring in one of the clamping bodies in order to protect it from attack by aggressive liquids and any solid particles carried therein.
  • the groove is a T-groove or dovetail groove.
  • these groove shapes are relatively easy to manufacture and, on the other hand, they can withstand high mechanical loads.
  • the spring at its end located at the front end of the rotor / ends is made shorter than the groove and that in the free part the groove, an elastic plug contoured according to the groove cross section can be used.
  • the invention proposes that the sealing strip has a metallic core and that the plastic or rubber covering is injection molded or vulcanized onto the core. In this way, a particularly intimate connection of the plastic or rubber covering with the metallic core is achieved. In addition, the volume of the plastic or rubber covering is limited, so that damage that could occur in larger volumes due to creeping or shearing of the plastic or rubber is avoided here.
  • the spring of the sealing strip can be made in one piece with the metallic core, which enables simple manufacture and high stability.
  • the spring of the sealing strip can also be a separate component and connected to the metallic core, preferably by means of a screw connection. This offers the possibility that the spring with the clamping wedge can still be used if the plastic or rubber covering of the sealing strip is worn. It is then sufficient to replace the metallic core with the plastic or rubber covering.
  • the exemplary embodiment of the rotor pump 1 shown consists of a housing 10 with an inlet connection 11 and an outlet connection 12 and two rotors 2, 2 ′ arranged inside the housing 10, which is oval in cross section.
  • the two rotors 2, 2 ′ are each three-bladed, that is to say they each have three displacement vanes 21.
  • the rotors 2, 2 ' are mounted parallel to one another on two shafts 20, 20' and in opposite directions to one another can be driven in rotation, as indicated by the arrows at the ends of the shafts 20, 20 '.
  • a cover flange 14 is provided, on which a flat housing cover, not shown here, can be sealingly placed and fixed.
  • a drive 13 is provided, for example an electric motor with a gear, which are not shown in detail here.
  • the two rotors 2, 2 'each have three displacement vanes 21, each of which has a sealing strip 3 at its radially outer end. Tongue and groove connections are provided for connecting the sealing strips 3 to the wings 21.
  • a groove 22 with a T-shaped cross section is visible on the upper wing 21 of the upper rotor 2. This groove 22 runs in the longitudinal direction of the rotor 2 through the wing 21.
  • the sealing strip 3 shown pulled out has on its underside a spring 32 which is shaped to match the groove 22 and which allows the sealing strip 3 to be inserted in the axial direction. Conversely, the sealing strip 3 can be pulled out in the axial direction.
  • the sealing strip 3 is provided in the areas in which it comes into contact with the inside of the wall of the pump housing 10 and the respective other rotor 2, 2 'with a plastic or rubber covering 31.
  • This plastic or rubber covering 31 is connected in a suitable manner to the rest of the metallic part of the sealing strip 3.
  • the spring 32 of the sealing strip 3 is also made of metal, preferably steel.
  • the spring 32 has a spring section designed as a clamping wedge 33. This clamping wedge 33 is displaceable by means of a screw bolt 35 guided in the axial direction by the spring 32.
  • the clamping wedge 33 can be between a release position which enables a displacement of the sealing strip 3 and a clamping position which fixes the sealing strip 3 on the wing 21 of the rotor 2.
  • the spring 32 of the sealing strip 3 is designed to be somewhat shorter than the groove 22 in the wing 21.
  • the remaining one of the Spring 32 not occupied space of the groove 22 serves to receive an elastic plug 36, which is adapted to the cross-sectional shape of the groove 22 and which can be pressed into this for sealing.
  • the plug 36 can simply be pulled outwards.
  • FIG. 2 of the drawing shows the rotor 2 from the rotor pump 1 according to FIG. 1 in the disassembled state, a sealing strip 3 also being shown here in the removed state.
  • the length of the individual sealing strips 3 is such that two sealing strips 3 fit one behind the other on a wing 21 of the rotor 2.
  • the sealing strips 3 arranged one behind the other are completely identical to one another, so that each sealing strip 3 can be used at any position.
  • these sealing strips 3, in the manner of a modular system can be used to equip smaller or larger rotors 2 in a corresponding gradation with one, two or three more sealing strips 3 per wing 21.
  • the arrangement of the clamping wedge 33 on the underside of the sealing strip 3 is shown particularly clearly here.
  • the clamping wedge 33 bears against the right part of the spring 32 of the sealing strip 3 in FIG.
  • the clamping wedge 33 is moved up or down by sliding along the inclined surfaces 34, 34 ', whereby the desired clamping force can be generated or canceled when the sealing strip 3 is arranged in the groove 22 in the blade 21 of the rotor 2 .
  • Figure 3 of the drawing shows part of a sealing strip 3 in a modified version compared to Figures 1 and 2, wherein the sealing strip part shown here consists of a metallic core 30 and a molded or vulcanized plastic or rubber coating 31 thereon.
  • the contour of the metallic core 30 results in a particularly strong and permanent connection between the core 30 and the plastic or rubber covering 31.
  • Figure 4 of the drawing shows a complete sealing strip 3 in longitudinal section, the plastic or rubber covering 31, the metallic core 30 and the spring 32 of the sealing strip 3 being visible from top to bottom.
  • FIG. 4 further shows that the plastic or rubber covering also extends in one piece over the end faces of the metallic core 30, as a result of which an adequate end face also Seal between the housing and sealing strip 3 is reached.
  • the part of the spring 32 on the left in FIG. 4 is designed as a clamping wedge 33 which, in the unlocked position shown here, is aligned with the remaining part of the spring 32.
  • the fixed part of the spring 32 has an inclined surface 34 at its left end, the clamping wedge 33 has an opposite inclined surface 34 'at its right end.
  • a threaded bore 33 ′ runs through the clamping wedge 33, into which a threaded bolt 35 can be screwed.
  • the threaded bolt 35 lies with its head on the right side, i. H. the end face of the spring 32 and runs through an axially extending bore 35 'through the spring 32.
  • the bore 35' is made so large that sufficient play of the threaded bolt 35 remains up and down to a displacement of the clamping wedge 33 relative to allow for the rest of the spring 32 along the pair of inclined surfaces 34, 34 '.
  • Two further bores 32 ' run perpendicular to the bore 35' through the spring 32 and serve to pass through the threaded bolt 30 '' for connecting the spring 32 to the metallic core 30 of the sealing strip 3.
  • Figure 5 of the drawing shows a sealing strip 3 in a modified version, which is characterized in particular by the fact that it has two clamping wedges 33. These two clamping wedges 33 are on the front and rear (in the drawing left and right) end of the spring 32 and aligned with this.
  • the right, ie front clamping wedge 33 in FIG. 5 has a stepped bore for receiving the upper part and the head of the screw bolt 35 and the middle part of the spring 32 is fixed and also has a through hole for the shaft of the threaded bolt 35.
  • a threaded bore 33 ' is provided, into which the end of the threaded bolt 35 provided with a counter thread can be screwed.
  • the two clamping wedges 33 can be released from the fixed part of the spring 32, after which the threaded bolts 30 ′′ are then accessible for connecting the spring 32 to the overlying core 30 of the sealing strip 3.
  • a small part of the rubber covering 31 can still be seen in FIG. 5 on the left and right outer edge.
  • FIG. 6 of the drawing finally illustrates the T-shape of the spring 32 in cross section, the threaded bolt 35 running through the lower part of the spring 32. Above the spring 32, the metallic core 30 of the sealing strip 3, which is screwed to this, is also indicated.

Description

Die Erfindung betrifft eine Rotorpumpe, insbesondere für die Förderung von Feststoffe enthaltenden Flüssigkeiten, nach dem Oberbegriff des Anspruchs 1.The invention relates to a rotor pump, in particular for the conveyance of liquids containing solids, according to the preamble of claim 1.

Eine Rotorpumpe der genannten Art ist aus der DE-AS 18 07 392 bekannt. Bei einer Ausführung dieser bekannten Rotorpumpe ist vorgesehen, daß die Dichtleisten aus in die Verdrängerflügel eingesetzten Kunststoffleisten gebildet sind, wobei vorzugsweise die Kunststoffleisten mit einem Fußteil in eine entsprechende Führung am Verdrängerflügel von dessen Stirnseite her eingesetzt sind. Um die Dichtleisten an einer Bewegung in ihrer Längsrichtung zu hindern, sind an den beiden Stirnseiten des Rotors flache Scheiben oder Leisten angebracht, die auch die Stirnenden der Dichtleisten überdecken. Die stirnseitigen Scheiben oder Leisten bestehen vorzugsweise aus dem gleichen Material wie die Dichtleisten, sind also elastisch und relativ nachgiebig.A rotor pump of the type mentioned is known from DE-AS 18 07 392. In one embodiment of this known rotor pump it is provided that the sealing strips are formed from plastic strips inserted into the displacer wing, the plastic strips preferably being inserted with a foot part into a corresponding guide on the displacer wing from the end face thereof. In order to prevent the sealing strips from moving in their longitudinal direction, flat disks or strips are attached to the two end faces of the rotor, which also cover the front ends of the sealing strips. The front disks or strips are preferably made of the same material as the sealing strips, so they are elastic and relatively flexible.

Als nachteilig wird bei dieser bekannten Rotorpumpe angesehen, daß die Arretierung der Dichtleisten an den Verdrängerflügeln nicht zuverlässig erfolgt, weil die dafür verwendeten stirnseitigen Scheiben oder Leisten nur geringe Kräfte aufnehmen können und einen sicheren, verschiebungsfreien Sitz der Dichtleisten während des Pumpenbetriebes nicht dauerhaft gewährleisten können.A disadvantage of this known rotor pump is that the locking of the sealing strips on the displacement blades does not take place reliably because the front disks or strips used for this can only absorb small forces and cannot ensure a secure, displacement-free fit of the sealing strips during pump operation.

Eine weitere Rotorpumpe ist aus der DE 37 07 722 A1 bekannt. Ein Ausführungsbeispiel dieser Rotorpumpe sieht eine Nut- und Federverbindung zwischen Verdrängerflügel und Dichtleiste vor. Dabei ist am Außenende des Flügels eine vorspringende, hinterschnittene Schwalbenschwanzfeder angeordnet, auf welche die Dichtleiste aufgesetzt ist. Um Bewegungen der Dichtleiste relativ zum Flügel im Übergangsbereich zwischen beiden zu vermeiden, ist die Dichtleiste an ihrer dem Flügel zugewandten Seite mit einer Metallplatte flächig verbunden. In die Metallplatte sowie in den unteren Teil der Dichtleiste ist eine zur Feder genau passende Schwalbenschwanznut eingeschnitten. Die Arretierung der Dichtleiste mit der Metallplatte auf dem Flügel erfolgt hier allein durch Reibungskräfte, was, wenn die Reibungskräfte durch entsprechende Bemaßung ausreichend hoch gewählt werden, für einen sicheren Sitz ausreichend ist. Jedoch erschweren diese hohen Reibungskräfte sehr stark das Ausbauen einer verschlissenen Dichtleiste zum Zweck des Austausches gegen eine neue Dichtleiste.Another rotor pump is known from DE 37 07 722 A1. An embodiment of this rotor pump provides a tongue and groove connection between the displacer wing and sealing strip. At the outer end of the wing there is a projecting, undercut dovetail spring on which the sealing strip is placed. In order to avoid movements of the sealing strip relative to the wing in the transition area between the two, the sealing strip is connected flat to a metal plate on its side facing the wing. A dovetail groove that exactly matches the tongue is cut into the metal plate and into the lower part of the sealing strip. The sealing strip with the metal plate on the wing is locked here solely by friction forces, which is sufficient for a secure fit if the friction forces are selected to be sufficiently high by appropriate dimensions. However, these high frictional forces make it very difficult to remove a worn sealing strip for the purpose of exchanging it for a new sealing strip.

Es stellt sich daher die Aufgabe, eine Rotorpumpe der eingangs genannten Art zu schaffen, bei der ein dauerhaft sicherer Sitz der Dichtleisten während des Pumpenbetriebes gewährleistet ist und bei der zugleich Wartungsarbeiten, insbesondere das Erneuern von Dichtleisten, schnell, einfach und kostengünstig durchführbar sind.It is therefore the task of creating a rotor pump of the type mentioned in the introduction, in which a permanently secure fit of the sealing strips is ensured during pump operation and in which maintenance work, in particular the renewing of sealing strips, can be carried out quickly, easily and inexpensively.

Die Lösung dieser Aufgabe gelingt erfindungsgemäß durch eine Rotorpumpe der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 1.This object is achieved according to the invention by a rotor pump of the type mentioned at the outset with the characterizing features of claim 1.

Mit der Erfindung wird zum einen erreicht, daß die von den Arretierungsmitteln ausgeübte Arretierungskraft nach Bedarf veränderbar ist. So kann zum Zweck des Einsetzens und Ausbauens einer Dichtleiste der Klemmkeil gelockert werden, wodurch das Aufschieben und Abziehen der Dichtleiste ohne großen Kraftaufwand vonstatten gehen kann. Zur sicheren Festlegung der Dichtleiste auf dem Verdrängerflügel wird der Klemmkeil in seine Klemmstellung gebracht, wodurch jede unbeabsichtigte und schädliche Verschiebung der Dichtleiste auf dem Verdrängerflügel ausgeschlossen wird. Da zudem das Betätigungselement für die Verschiebung des Klemmkeils von der Dichtleistenstirnseite her zugänglich ist, ist ein problemloser Zugang gegeben. Es genügt also eine stirnseitige Öffnung im Pumpengehäuse, um eine oder mehrere Dichtleisten aus- und einzubauen. Hierdurch werden der Zeit- und Arbeitsaufwand für die Wartung und Reparatur der Rotorpumpe vorteilhaft verringert.With the invention it is achieved on the one hand that the locking force exerted by the locking means can be changed as required. So for the purpose of insertion and removal of a sealing strip, the clamping wedge can be loosened, as a result of which the sealing strip can be pushed on and pulled off without great effort. In order to securely fix the sealing strip on the displacer wing, the clamping wedge is brought into its clamping position, whereby any unintentional and harmful displacement of the sealing strip on the displacer wing is excluded. Since the actuating element for the displacement of the clamping wedge is also accessible from the face of the sealing strip, easy access is provided. An opening in the front of the pump housing is therefore sufficient to remove and install one or more sealing strips. This advantageously reduces the time and effort required for the maintenance and repair of the rotor pump.

Eine bevorzugte Ausgestaltung sieht vor, daß die Rotorflügel jeweils mit einer hinterschnittenen Nut und die Dichtleisten jeweils mit einer zur Nut passend geformten Feder ausgebildet sind und daß der Klemmkeil jeweils als Teil der Feder ausgebildet ist. Die Rotorflügel, die für eine längere Betriebsdauer in der Pumpe verbleiben, weisen damit keine beweglichen Teile auf; die beweglichen Teile sind an den Dichtleisten vorgesehen, die ohnehin von Zeit zu Zeit aufgrund des zwangsläufig auftretenden Verschleißes ausgetauscht werden müssen. Hierdurch wird ausgeschlossen, daß aufgrund von Korrosion durch aggressive geförderte Flüssigkeiten beispielsweise der Klemmkeil nicht mehr verschoben werden kann.A preferred embodiment provides that the rotor blades are each formed with an undercut groove and the sealing strips are each formed with a spring which is shaped to match the groove and that the clamping wedge is in each case formed as part of the spring. The rotor blades, which remain in the pump for a longer operating time, therefore have no moving parts; the moving parts are provided on the sealing strips, which anyway have to be replaced from time to time due to the inevitable wear. This precludes the fact that, for example, the clamping wedge can no longer be displaced due to corrosion caused by aggressively pumped liquids.

Weiter ist vorgesehen, daß der Klemmkeil als mit dem übrigen, festen Teil der Feder fluchtender loser Körper ausgebildet ist, der über ein Schrägflächenpaar an dem benachbarten festen Teil der Feder anliegt. Die Arretierungsmittel benötigen auf diese Weise keinen besonderen Einbauraum, sondern sind platzsparend in die Feder der Dichtleiste integriert. Die Schrägflächen sind vorzugsweise so ausgerichtet, daß sich eine in Radialrichtung des Rotors wirkende Klemmkraft ergibt.It is further provided that the clamping wedge is designed as a loose body aligned with the rest of the fixed part of the spring, which rests against the adjacent fixed part of the spring via a pair of inclined surfaces. In this way, the locking means do not require any special installation space, but are integrated into the spring of the sealing strip to save space. The sloping surfaces are preferred aligned so that there is a clamping force acting in the radial direction of the rotor.

Eine Weiterbildung der Erfindung sieht vor, daß der feste Teil der Feder deren in Federlängsrichtung gesehen mittleren Bereich einnimmt und daß beiderseits dieses festen Teils der Feder je ein Klemmkeil fluchtend angeordnet ist. Hierdurch wird erreicht, daß eine gegenseitige Verklemmung von Feder und Nut sowohl im vorderen als auch im hinteren Bereich der Nut erfolgt, was inbesondere bei relativ langen Dichtleisten vorteilhaft ist, da hierdurch die im Pumpenbetrieb auftretenden Scherkräfte besser verteilt werden. Dies vermindert das Risiko von Scherbrüchen innerhalb der Dichtleisten auch bei hohen mechanischen Belastungen.A further development of the invention provides that the fixed part of the spring occupies its central region, as seen in the longitudinal direction of the spring, and that a clamping wedge is aligned on both sides of this fixed part of the spring. This ensures that there is mutual jamming of the tongue and groove both in the front and in the rear area of the groove, which is particularly advantageous in the case of relatively long sealing strips, since the shear forces occurring during pump operation are thereby better distributed. This reduces the risk of shear fractures within the sealing strips, even with high mechanical loads.

Die Erfindung schlägt weiter vor, daß das Betätigungselement für den Klemmkeil/die Klemmkeile durch einen in Axialrichtung durch die Dichtleiste geführten Schraubbolzen gebildet ist, der in eine in dem Klemmkeil/in einem der Klemmkeile vorgesehene Gewindebohrung einschraubbar ist. Hierbei liegt dann der Kopf des Schraubbolzens, an welchem ein geeignetes Betätigungswerkzeug anzusetzen ist, an der Stirnseite der Dichtleiste, was eine einfache Betätigung ermöglicht. Zweckmäßig ist der Kopf des Schraubbolzens versenkt in der Dichtleiste, d.h. im festen Teil der Feder oder bei Verwendung von zwei Klemmkeilen je Feder in einem der Klemmkörper angeordnet, um ihn vor dem Angriff von aggressiven Flüssigkeiten und darin gegebenenfalls mitgeführten Feststoffteilchen zu schützen.The invention further proposes that the actuating element for the clamping wedge / the clamping wedges is formed by a screw bolt guided in the axial direction through the sealing strip, which can be screwed into a threaded bore provided in the clamping wedge / in one of the clamping wedges. The head of the screw bolt, on which a suitable actuating tool is to be attached, then lies on the end face of the sealing strip, which enables simple actuation. The head of the screw bolt is expediently countersunk in the sealing strip, i.e. arranged in the fixed part of the spring or when using two clamping wedges per spring in one of the clamping bodies in order to protect it from attack by aggressive liquids and any solid particles carried therein.

Hinsichtlich der Nutformen ist bevorzugt vorgesehen, daß die Nut eine T-Nut oder Schwalbenschwanznut ist. Diese Nutformen sind einerseits relativ einfach herstellbar und andererseits mechanisch hoch belastbar.With regard to the groove shapes, it is preferably provided that the groove is a T-groove or dovetail groove. On the one hand, these groove shapes are relatively easy to manufacture and, on the other hand, they can withstand high mechanical loads.

Um die Nut gegen das Eindringen von aggressiven Flüssigkeiten, die mit der Pumpe gefördert werden, zu schützen, ist vorgesehen, daß die Feder an ihrem/ihren am Stirnende des Rotors liegenden Ende/Enden kürzer als die Nut ausgeführt ist und daß in den freien Teil der Nut ein entsprechend dem Nutquerschnitt konturierter elastischer Stopfen einsetzbar ist.In order to protect the groove against the penetration of aggressive liquids which are conveyed by the pump, it is provided that the spring at its end located at the front end of the rotor / ends is made shorter than the groove and that in the free part the groove, an elastic plug contoured according to the groove cross section can be used.

Um auf möglichst einfache Weise einen Zugang zur Stirnseite der Rotoren zu gewährleisten, ist vorgesehen, daß das Pumpengehäuse an seiner dem Antrieb abgewandten Stirnseite einen abnehmbaren flachen Deckel aufweist, vor dessen Innenseite im angebauten Zustand des Deckels das freie Stirnende der beiden Rotoren liegt. Damit wird auch eine einfachere Form des Pumpengehäuses ermöglicht, was dessen Herstellung vereinfacht und verbilligt. Trotzdem genügt diese stirnseitige Öffnung vollkommen zum Austausch der Dichtleisten.In order to ensure access to the end face of the rotors in the simplest possible way, it is provided that the pump housing has a removable flat cover on its end face facing away from the drive, in front of which the free end face of the two rotors lies in the installed state of the cover. This also enables a simpler shape of the pump housing, which simplifies and makes it cheaper to manufacture. Nevertheless, this opening on the front is completely sufficient to replace the sealing strips.

Hinsichtlich der Ausgestaltung der Dichtleisten schlägt die Erfindung vor, daß die Dichtleiste einen metallischen Kern aufweist und daß der Kunststoff- oder Gummibelag an den Kern angespritzt oder anvulkanisiert ist. Hierdurch wird eine besonders innige Verbindung des Kunststoff- oder Gummibelages mit dem metallischen Kern erreicht. Außerdem wird das Volumen des Kunststoff- oder Gummibelages begrenzt, so daß Schäden, die bei größeren Volumina infolge eines Kriechens oder Abscherens des Kunststoffes oder Gummis auftreten könnten, hier vermieden werden.With regard to the design of the sealing strips, the invention proposes that the sealing strip has a metallic core and that the plastic or rubber covering is injection molded or vulcanized onto the core. In this way, a particularly intimate connection of the plastic or rubber covering with the metallic core is achieved. In addition, the volume of the plastic or rubber covering is limited, so that damage that could occur in larger volumes due to creeping or shearing of the plastic or rubber is avoided here.

Die Feder der Dichtleiste kann mit dem metallischen Kern einstückig ausgeführt sein, was eine einfache Herstellung ermöglicht und eine hohe Stabilität ergibt. Alternativ kann die Feder der Dichtleiste auch ein separates Bauteil sein und mit dem metallischen Kern verbunden sein, bevorzugt durch eine Verschraubung. Dies bietet die Möglichkeit, daß die Feder mit dem Klemmkeil noch weiterverwendbar ist, wenn der Kunststoff- oder Gummibelag der Dichtleiste verschlissen ist. Hier genügt dann der Austausch des metallischen Kerns mit dem Kunststoff- oder Gummibelag.The spring of the sealing strip can be made in one piece with the metallic core, which enables simple manufacture and high stability. Alternatively, the spring of the sealing strip can also be a separate component and connected to the metallic core, preferably by means of a screw connection. This offers the possibility that the spring with the clamping wedge can still be used if the plastic or rubber covering of the sealing strip is worn. It is then sufficient to replace the metallic core with the plastic or rubber covering.

Ausführungsbeispiele der Erfindung werden im foglenden anhand einer Zeichnung erläutert. Die Figuren der Zeichnung zeigen:

Figur 1
eine Rotorpumpe mit geöffnetem Pumpengehäuse und mit einer herausgezogenen Dichtleiste, in perspektivischer Darstellung,
Figur 2
einen Rotor der Rotorpumpe mit einer ausgebauten Dichtleiste, in perspektivischer Ansicht,
Figur 3
einen Teil einer Dichtleiste in einer geänderten Ausführung, im Querschnitt,
Figur 4
die vervollständigte Dichtleiste im Längsschnitt,
Figur 5
die Dichtleiste in einer geänderten Ausführung, ebenfalls im Längsschnitt, und
Figur 6
die Dichtleiste aus Figur 5 im Querschnitt entlang der Linie VI - VI.
Embodiments of the invention are explained below with reference to a drawing. The figures in the drawing show:
Figure 1
a rotor pump with an open pump housing and with a pulled sealing strip, in a perspective view,
Figure 2
a rotor of the rotor pump with an expanded sealing strip, in a perspective view,
Figure 3
a part of a sealing strip in a modified version, in cross section,
Figure 4
the completed sealing strip in longitudinal section,
Figure 5
the sealing strip in a modified version, also in longitudinal section, and
Figure 6
the sealing strip of Figure 5 in cross section along the line VI - VI.

Wie die Figur 1 der Zeichnung zeigt, besteht das dargestellte Ausführungsbeispiel der Rotorpumpe 1 aus einem Gehäuse 10 mit Zulaufstutzen 11 und Ablaufstutzen 12 sowie zwei im Inneren des im Querschnitt gesehen ovalen Gehäuses 10 angeordneten Rotoren 2, 2'. Die beiden Rotoren 2, 2' sind in diesem Ausführungsbeispiel jeweils dreiflüglig, d. h. mit jeweils drei Verdrängerflügeln 21 ausgeführt. Die Rotoren 2, 2' sind parallel zueinander auf zwei Wellen 20, 20' gelagert und gegensinnig zueinander drehantreibbar, wie durch die Pfeile an den Stirnenden der Wellen 20, 20' angedeutet ist. An dem hier mit offener Stirnseite gezeigten Gehäuse 10 ist ein Deckelflansch 14 vorgesehen, auf welchen ein hier nicht eigens dargestellter flacher Gehäusedeckel dichtend aufsetzbar und festlegbar ist. Am gegenüberliegenden Ende des Gehäuses 10 der Rotorpumpe 1 ist ein Antrieb 13 vorgesehen, beispielsweise ein Elektromotor mit einem Getriebe, die hier nicht im einzelnen dargestellt sind.As FIG. 1 of the drawing shows, the exemplary embodiment of the rotor pump 1 shown consists of a housing 10 with an inlet connection 11 and an outlet connection 12 and two rotors 2, 2 ′ arranged inside the housing 10, which is oval in cross section. In this exemplary embodiment, the two rotors 2, 2 ′ are each three-bladed, that is to say they each have three displacement vanes 21. The rotors 2, 2 'are mounted parallel to one another on two shafts 20, 20' and in opposite directions to one another can be driven in rotation, as indicated by the arrows at the ends of the shafts 20, 20 '. On the housing 10 shown here with an open end face, a cover flange 14 is provided, on which a flat housing cover, not shown here, can be sealingly placed and fixed. At the opposite end of the housing 10 of the rotor pump 1, a drive 13 is provided, for example an electric motor with a gear, which are not shown in detail here.

Die beiden Rotoren 2, 2' besitzen jeweils drei Verdrängerflügel 21, die an ihrem radial äußeren Ende jeweils eine Dichtleiste 3 tragen. Zur Verbindung der Dichtleisten 3 mit den Flügeln 21 sind jeweils Nut- und Feder-Verbindungen vorgesehen. An dem oberen Flügel 21 des oberen Rotors 2 ist eine im Querschnitt T-förmige Nut 22 sichtbar. Diese Nut 22 verläuft in Längsrichtung des Rotors 2 durch den Flügel 21. Die herausgezogen dargestellte Dichtleiste 3 besitzt an ihrer Unterseite eine zu der Nut 22 passend geformte Feder 32, die ein Einschieben der Dichtleiste 3 in Axialrichtung erlaubt. Umgekehrt ist ein Herausziehen der Dichtleiste 3 in Axialrichtung möglich. Die Dichtleiste 3 besteht in den Bereichen, in denen sie in Anlage an die Innenseite der Wandung des Pumpengehäuses 10 sowie an den jeweils anderen Rotor 2, 2' gelangt, mit einem Kunststoff- oder Gummibelag 31 versehen. Dieser Kunststoff- oder Gummibelag 31 ist in geeigneter Weise mit dem übrigen, metallischen Teil der Dichtleiste 3 verbunden. Die Feder 32 der Dichtleiste 3 besteht ebenfalls aus Metall, vorzugsweise aus Stahl. Zur Arretierung der Dichtleiste 3 auf dem Flügel 21 des Rotors 2 besitzt die Feder 32 einen als Klemmkeil 33 ausgebildeten Federabschnitt. Dieser Klemmkeil 33 ist mittels eines in Axialrichtung durch die Feder 32 geführten Schraubbolzens 35 verschiebbar. Durch Verdrehen des Schraubbolzens 35, dessen Kopf an der Stirnseite der Dichtleiste 3 liegt, kann der Klemmkeil 33 zwischen einer eine Verschiebung der Dichtleiste 3 ermöglichenden Lösestellung und einer die Dichtleiste 3 auf dem Flügel 21 des Rotors 2 festlegenden Klemmstellung verstellt werden. Um ein Eindringen von aggressiven, durch die Pumpe geförderten Flüssigkeiten in die Nut 22 sowie in den Bereich des Kopfes des Schraubbolzens 35 zu verhindern, ist die Feder 32 der Dichtleiste 3 etwas kürzer ausgebildet als die Nut 22 im Flügel 21. Der verbleibende, von der Feder 32 nicht eingenommene Raum der Nut 22 dient zur Aufnahme eines elastischen Stopfens 36, der der Querschnittsform der Nut 22 angepaßt ist und der in diese zur Abdichtung eindrückbar ist. Um zu dem Kopf des Schraubbolzens 35 für die Verstellung des Klemmteils 33 zu gelangen, kann der Stopfen 36 einfach nach außen herausgezogen werden.The two rotors 2, 2 'each have three displacement vanes 21, each of which has a sealing strip 3 at its radially outer end. Tongue and groove connections are provided for connecting the sealing strips 3 to the wings 21. A groove 22 with a T-shaped cross section is visible on the upper wing 21 of the upper rotor 2. This groove 22 runs in the longitudinal direction of the rotor 2 through the wing 21. The sealing strip 3 shown pulled out has on its underside a spring 32 which is shaped to match the groove 22 and which allows the sealing strip 3 to be inserted in the axial direction. Conversely, the sealing strip 3 can be pulled out in the axial direction. The sealing strip 3 is provided in the areas in which it comes into contact with the inside of the wall of the pump housing 10 and the respective other rotor 2, 2 'with a plastic or rubber covering 31. This plastic or rubber covering 31 is connected in a suitable manner to the rest of the metallic part of the sealing strip 3. The spring 32 of the sealing strip 3 is also made of metal, preferably steel. For locking the sealing strip 3 on the wing 21 of the rotor 2, the spring 32 has a spring section designed as a clamping wedge 33. This clamping wedge 33 is displaceable by means of a screw bolt 35 guided in the axial direction by the spring 32. By turning the screw bolt 35, the head of which lies on the end face of the sealing strip 3, the clamping wedge 33 can be between a release position which enables a displacement of the sealing strip 3 and a clamping position which fixes the sealing strip 3 on the wing 21 of the rotor 2. In order to prevent aggressive liquids conveyed by the pump from penetrating into the groove 22 and into the area of the head of the screw bolt 35, the spring 32 of the sealing strip 3 is designed to be somewhat shorter than the groove 22 in the wing 21. The remaining one of the Spring 32 not occupied space of the groove 22 serves to receive an elastic plug 36, which is adapted to the cross-sectional shape of the groove 22 and which can be pressed into this for sealing. In order to get to the head of the bolt 35 for the adjustment of the clamping part 33, the plug 36 can simply be pulled outwards.

Figur 2 der Zeichnung zeigt den Rotor 2 aus der Rotorpumpe 1 gemäß Figur 1 in ausgebautem Zustand, wobei auch hier eine Dichtleiste 3 in herausgenommenem Zustand gezeigt ist. Wie aus der Figur 2 weiterhin deutlich wird, sind die einzelnen Dichtleisten 3 in ihrer Länge so bemessen, daß jeweils zwei Dichtleisten 3 hintereinander auf einen Flügel 21 des Rotors 2 passen. Im Fall einer nur teilweisen Beschädigung eines Rotors im Bereich einer einzelnen Dichtleiste 3 genügt hier also auch der Austausch einer einzelnen, nur über die halbe Länge des Rotors 2 reichenden Dichtleiste 3, was den Aufwand für Ersatzteile vermindert. Die hintereinander angeordneten Dichtleisten 3 sind dabei untereinander vollkommen identisch, so daß jede Dichtleiste 3 an jeder beliebigen Position eingesetzt werden kann. Auch können mit diesen Dichtleisten 3 nach Art eines Baukastensystems kleinere oder größere Rotoren 2 in entsprechender Abstufung mit einer, zwei oder drei mehr Dichtleisten 3 je Flügel 21 bestückt werden.FIG. 2 of the drawing shows the rotor 2 from the rotor pump 1 according to FIG. 1 in the disassembled state, a sealing strip 3 also being shown here in the removed state. As is also clear from FIG. 2, the length of the individual sealing strips 3 is such that two sealing strips 3 fit one behind the other on a wing 21 of the rotor 2. In the event of only partial damage to a rotor in the area of a single sealing strip 3, it is therefore sufficient here to replace a single sealing strip 3 which only extends over half the length of the rotor 2, which reduces the outlay for spare parts. The sealing strips 3 arranged one behind the other are completely identical to one another, so that each sealing strip 3 can be used at any position. Also, these sealing strips 3, in the manner of a modular system, can be used to equip smaller or larger rotors 2 in a corresponding gradation with one, two or three more sealing strips 3 per wing 21.

An der herausgezogen dargestellten Dichtleiste 3 wird hier besonders deutlich die Anordnung des Klemmkeils 33 an der Unterseite der Dichtleiste 3 gezeigt. Über ein Paar von Schrägflächen 34, 34' liegt der Klemmkeil 33 an dem in der Figur 2 rechten Teil der Feder 32 der Dichtleiste 3 an. Durch Verdrehen des Schraubbolzens 35 wird der Klemmkeil 33 durch Verschieben entlang der Schrägflächen 34, 34' nach oben oder unten bewegt, wodurch die gewünschte Klemmkraft erzeugt oder aufgehoben werden kann, wenn die Dichtleiste 3 in die Nut 22 im Flügel 21 des Rotors 2 angeordnet ist.On the sealing strip 3 shown pulled out, the arrangement of the clamping wedge 33 on the underside of the sealing strip 3 is shown particularly clearly here. Via a pair of inclined surfaces 34, 34 ', the clamping wedge 33 bears against the right part of the spring 32 of the sealing strip 3 in FIG. By turning the bolt 35, the clamping wedge 33 is moved up or down by sliding along the inclined surfaces 34, 34 ', whereby the desired clamping force can be generated or canceled when the sealing strip 3 is arranged in the groove 22 in the blade 21 of the rotor 2 .

Werden mehrere Dichtleisten 3 hintereinander auf einem Flügel 21 angeordnet, wird, falls ein Austausch der hinteren, d. h. in Figur 2 linken Dichtleiste 3 erforderlich ist, zunächst die vordere Dichtleiste 3 ausgebaut, wodurch dann der Schraubbolzen 35 in der Stirnseite der hinteren Dichtleiste zugänglich wird. Der Einbau der Dichtleisten 3 erfolgt in umgekehrter Reihenfolge.If several sealing strips 3 are arranged one behind the other on a wing 21, if an exchange of the rear, ie. H. In FIG. 2 left sealing strip 3 is required, the front sealing strip 3 is first removed, as a result of which the screw bolt 35 in the end face of the rear sealing strip is then accessible. The sealing strips 3 are installed in the reverse order.

Figur 3 der Zeichnung zeigt einen Teil einer Dichtleiste 3 in einer gegenüber den Figuren 1 und 2 geänderten Ausführung, wobei der hier gezeigte Dichtleistenteil aus einem metallischen Kern 30 und aus einem an diesen angespritzten oder anvulkanisierten Kunststoff- oder Gummibelag 31 besteht. Durch die Kontur des metallischen Kerns 30 wird eine besonders feste und dauerhafte Verbindung zwischen dem Kern 30 und dem Kunststoff- oder Gummibelag 31 erreicht.Figure 3 of the drawing shows part of a sealing strip 3 in a modified version compared to Figures 1 and 2, wherein the sealing strip part shown here consists of a metallic core 30 and a molded or vulcanized plastic or rubber coating 31 thereon. The contour of the metallic core 30 results in a particularly strong and permanent connection between the core 30 and the plastic or rubber covering 31.

Figur 4 der Zeichnung zeigt eine komplette Dichtleiste 3 im Längsschnitt, wobei von oben nach unten zunächst der Kunststoff- oder Gummibelag 31, der metallische Kern 30 und die Feder 32 der Dichtleiste 3 sichtbar sind. Weiter zeigt die Figur 4, daß der Kunststoff- oder Gummibelag einstückig auch über die Stirnseiten des metallischen Kerns 30 reicht, wodurch auch stirnseitig eine ausreichend Dichtung zwischen Gehäuse und Dichtleiste 3 erreicht wird.Figure 4 of the drawing shows a complete sealing strip 3 in longitudinal section, the plastic or rubber covering 31, the metallic core 30 and the spring 32 of the sealing strip 3 being visible from top to bottom. FIG. 4 further shows that the plastic or rubber covering also extends in one piece over the end faces of the metallic core 30, as a result of which an adequate end face also Seal between the housing and sealing strip 3 is reached.

Die Feder 32 hat hier im Querschnitt eine T-Form, wobei der T-Querbalken nach unten weist. Der schmalere Teil der T-förmigen Feder 32 liegt in einer Ausnehmung in der Unterseite des metallischen Kerns 30 und ist mit diesem mittels zweier Gewindebolzen 30'' lösbar verschraubt.The spring 32 here has a T-shape in cross section, the T-crossbar pointing downward. The narrower part of the T-shaped spring 32 lies in a recess in the underside of the metallic core 30 and is detachably screwed to it by means of two threaded bolts 30 ″.

Der in Figur 4 linke Teile der Feder 32 ist als Klemmkeil 33 ausgebildet, der in der hier gezeigten, entarretierten Stellung mit dem übrigen Teil der Feder 32 fluchtet. Der feststehende Teil der Feder 32 besitzt an seinem linken Ende eine Schrägfläche 34, der Klemmkeil 33 besitzt an seinem rechten Ende eine gegengleich verlaufende Schrägfläche 34'. Durch den Klemmkeil 33 verläuft eine Gewindebohrung 33', in welche ein Gewindebolzen 35 einschraubbar ist. Der Gewindebolzen 35 liegt mit seinem Kopf an der rechten Seite, d. h. der Stirnseite der Feder 32 und läuft durch eine in Axialrichtung verlaufende Bohrung 35' durch die Feder 32. Die Bohrung 35' ist dabei so groß ausgeführt, daß ein ausreichendes Spiel des Gewindebolzens 35 nach oben und unten verbleibt, um eine Verschiebung des Klemmkeils 33 relativ zum übrigen Teil der Feder 32 entlang dem Schrägflächenpaar 34, 34' zu ermöglichen. Zwei weitere Bohrungen 32' verlaufen senkrecht zur Bohrung 35' durch die Feder 32 und dienen zur Durchführung der Gewindebolzens 30'' für die Verbindung der Feder 32 mit dem metallischen Kern 30 der Dichtleiste 3. Für die Einführung des in Figur 4 rechten Gewindebolzens 30'' muß zuvor der Gewindebolzen 35 entfernt werden.The part of the spring 32 on the left in FIG. 4 is designed as a clamping wedge 33 which, in the unlocked position shown here, is aligned with the remaining part of the spring 32. The fixed part of the spring 32 has an inclined surface 34 at its left end, the clamping wedge 33 has an opposite inclined surface 34 'at its right end. A threaded bore 33 ′ runs through the clamping wedge 33, into which a threaded bolt 35 can be screwed. The threaded bolt 35 lies with its head on the right side, i. H. the end face of the spring 32 and runs through an axially extending bore 35 'through the spring 32. The bore 35' is made so large that sufficient play of the threaded bolt 35 remains up and down to a displacement of the clamping wedge 33 relative to allow for the rest of the spring 32 along the pair of inclined surfaces 34, 34 '. Two further bores 32 'run perpendicular to the bore 35' through the spring 32 and serve to pass through the threaded bolt 30 '' for connecting the spring 32 to the metallic core 30 of the sealing strip 3. For the introduction of the right-hand threaded bolt 30 'in FIG. 'The threaded bolt 35 must be removed beforehand.

Figur 5 der Zeichnung zeigt eine Dichtleiste 3 in einer geänderten Ausführung, die insbesondere dadurch charakterisiert ist, daß sie zwei Klemmkeile 33 aufweist. Diese beiden Klemmkeile 33 sind am vorderen und hinteren (in der Zeichnung linken und rechten) Ende der Feder 32 angeordnet und fluchten mit dieser. Der in Figur 5 rechte, d.h. vordere Klemmkeil 33 besitzt eine abgestufte Bohrung zur Aufnahme des oberen Teils und des Kopfes des Schraubbolzens 35 und der mittlere Teil der Feder 32 ist fest und weist ebenfalls eine Durchgangsbohrung für den Schaft des Gewindebolzens 35 auf. In dem in Figur 5 linken, d.h. hinteren Klemmkeil 33 ist eine Gewindebohrung 33' vorgesehen, in welche das mit einem Gegengewinde versehene Ende des Gewindebolzens 35 einschraubbar ist. Durch Verdrehen des Gewindebolzens 35 in Einschraubrichtung werden die beiden Klemmkeile 33 gegeneinander gezogen, wodurch sie auf den Schrägflächen 34', 34 nach oben gleiten und sich so in der Nut 22 im Rotor 2 (hier nicht dargestellt) verklemmen. Ersichtlicherweise erfolgt eine Verklemmung sowohl im vorderen als auch im hinteren Teil der Nut, so daß eine gleichmäßige Krafteinleitung ermöglicht wird.Figure 5 of the drawing shows a sealing strip 3 in a modified version, which is characterized in particular by the fact that it has two clamping wedges 33. These two clamping wedges 33 are on the front and rear (in the drawing left and right) end of the spring 32 and aligned with this. The right, ie front clamping wedge 33 in FIG. 5 has a stepped bore for receiving the upper part and the head of the screw bolt 35 and the middle part of the spring 32 is fixed and also has a through hole for the shaft of the threaded bolt 35. In the left, ie rear clamping wedge 33 in FIG. 5, a threaded bore 33 'is provided, into which the end of the threaded bolt 35 provided with a counter thread can be screwed. By turning the threaded bolt 35 in the screwing-in direction, the two clamping wedges 33 are pulled against each other, whereby they slide upwards on the inclined surfaces 34 ', 34 and thus become jammed in the groove 22 in the rotor 2 (not shown here). Obviously there is a jamming in both the front and the rear part of the groove, so that a uniform introduction of force is made possible.

Durch vollständiges Herausdrehen des Gewindebolzens 35 können die beiden Klemmkeile 33 vom festen Teil der Feder 32 gelöst werden, wonach dann die Gewindebolzen 30'' zur Verbindung der Feder 32 mit dem darüberliegenden Kern 30 der Dichtleiste 3 zugänglich werden. An den Stirnenden, d.h. in Figur 5 am linken und rechten äußeren Rand ist noch ein kleiner Teil des Gummibelages 31 erkennbar.By completely unscrewing the threaded bolt 35, the two clamping wedges 33 can be released from the fixed part of the spring 32, after which the threaded bolts 30 ″ are then accessible for connecting the spring 32 to the overlying core 30 of the sealing strip 3. At the ends, i.e. a small part of the rubber covering 31 can still be seen in FIG. 5 on the left and right outer edge.

Figur 6 der Zeichnung schließlich verdeutlicht die T-Form der Feder 32 im Querschnitt, wobei durch den unteren Teil der Feder 32 der Gewindebolzen 35 verläuft. Oberhalb der Feder 32 ist noch der mit dieser verschraubte metallische Kern 30 der Dichtleiste 3 angedeutet.Figure 6 of the drawing finally illustrates the T-shape of the spring 32 in cross section, the threaded bolt 35 running through the lower part of the spring 32. Above the spring 32, the metallic core 30 of the sealing strip 3, which is screwed to this, is also indicated.

Claims (10)

  1. Rotary pump particularly for the delivering of liquids containing solid particles comprising a pump housing (10) with an oval cross-section, a pair of meshing and counter-rotatable rotors (2, 2') arranged on shafts (20, 20') in the housing (10) with the rotors each comprising several displacing vanes (21) each carrying at the radially outmost end thereof at least one replaceable sealing ledge (3) with a plastic or rubber coating (31) which ledges rotate along the inner side of the wall of the pump housing (10) in a sealing fashion and contact the other rotor (2, 2') when rotating the rotors (2, 2'), wherein the sealing ledges (3) are mountable onto the displacing vanes (21) in axial direction by means of a groove and tongue connection, and are securable by locking means at the vanes,
    characterized in
    that the locking means consist of at least one clamp wedge (33) per sealing ledge (3) with the wedge displaceable by an actuating element accessible from the front side of the sealing ledge.
  2. Rotary pump as claimed in claim 1, characterized in that the rotor vanes (21) are shaped with an undercut groove (22) each, and the sealing ledges (3) are shaped with a tongue (32) formed correspondingly with the groove (22), and that the clamp wedge (33) is shaped as a part of the tongue (32).
  3. Rotary pump as claimed in claim 2, characterized in that the clamp wedge (33) is formed as a loose member flush with the remaining secured part of the tongue (32) with the loose member abutting the adjacent secured part of the tongue (32) with a pair of angular surfaces (34, 34').
  4. Rotary pump as claimed in claim 3, characterized in that the secured part of the tongue (32) is positioned in the centre area thereof as viewed in longitudinal direction of the tongue, and that at each of both sides of this secured part of the tongue (32) a clamp wedge (33) is arranged in an aligned fashion.
  5. Rotary pump as claimed in one of the claims 1 to 4, characterized in that the actuating element for the clamp wedge/wedges (33) is formed by a threaded bolt (35) extending through the sealing ledge (3) in axial direction with the threaded bolt (35) to be screwed into a threaded bore (33') provided in the clamp wedge or one of the clamp wedges (33), respectively.
  6. Rotary pump as claimed in one of the claims 2 to 5, characterized in that the groove (22) is a T-groove or a dovetail groove.
  7. Rotary pump as claimed in one of the claims 1 to 6, characterized in that the tongue (32) at the end/ends thereof adjacent to the front end of the rotor (2, 2') is made shorter than the groove (22), and that an elastic plug (36) is insertable into the free part of the groove (22) with the plug shaped correspondingly with the cross-section of the groove.
  8. Rotary pump as claimed in one of the claims 1 to 7, characterized in that the pump housing (10) at the front side thereof facing away from the drive (13) comprises a flat detachable lid with the free front end of the rotors (2, 2') arranged in front of the inner side of the lid in the mounted condition.
  9. Rotary pump as claimed in one of the claims 1 to 8, characterized in that the sealing ledge (3) comprises a metallic core (30), and that the plastic or rubber coating (31) is spray-coated or vulcanized at the core (30).
  10. Rotary pump as claimed in claim 9, characterized in that the tongue (32) is formed integral with the metallic core (30), or is detachably connected with the metallic core (30) as a separate member.
EP93119062A 1992-11-27 1993-11-25 Rotary Pump Expired - Lifetime EP0599333B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9216170U DE9216170U1 (en) 1992-11-27 1992-11-27
DE9216170U 1992-11-27

Publications (2)

Publication Number Publication Date
EP0599333A1 EP0599333A1 (en) 1994-06-01
EP0599333B1 true EP0599333B1 (en) 1996-06-12

Family

ID=6886502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119062A Expired - Lifetime EP0599333B1 (en) 1992-11-27 1993-11-25 Rotary Pump

Country Status (3)

Country Link
EP (1) EP0599333B1 (en)
JP (1) JP3363189B2 (en)
DE (2) DE9216170U1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2304380A (en) * 1995-08-17 1997-03-19 Tochigi Fuji Sangyo Kk Chucking flats formed in the end of a hollow toothed screw rotor.
DE19802264C1 (en) * 1998-01-22 1998-11-26 Boerger Gmbh Rotary pump for solid suspensions in fluids
WO2001088377A1 (en) 2000-05-18 2001-11-22 Hugo Vogelsang Maschinenbau Gmbh Rotating piston pump
DE102008045440A1 (en) 2008-09-02 2010-03-04 Börger GmbH Rotary piston for use in rotary piston pump for conveying fibrous material, has radial sealing area laminarly designed as cylinder barrel section surface, and linear recess arranged in radial and axial sealing areas

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Publication number Priority date Publication date Assignee Title
DE4313457C1 (en) * 1993-04-24 1994-05-11 Alois Boerger Pump with intermeshing lobed rotors - has adjusting mechanism in each lobe thrusting elastomer cover at tip outwards and has adjusting body sliding in groove inside lobe
DE10022097C1 (en) * 2000-05-08 2001-09-27 Boerger Gmbh Rotary piston pump, especially for delivery of fluids containing solids, has exchangeable, detachably mounted strip installed on each acutely angled edge of each displacement vane
DE202006007501U1 (en) * 2006-05-11 2007-09-13 Hugo Vogelsang Maschinenbau Gmbh Rotary pump
JP2008286183A (en) * 2007-05-20 2008-11-27 Yoshio Abe Rotor seal
WO2013019948A1 (en) * 2011-08-03 2013-02-07 Ramos Rolando Nico M Piston with replaceable and/or adjustable surfaces
KR101439349B1 (en) * 2013-01-25 2014-09-11 제이엠모터스 주식회사 Belt with interchange able wear-resistant rotor with rotary positive displacement pumps
CN104791243A (en) * 2015-04-07 2015-07-22 上海大学 Combined special-tooth-profile cam rotor pump
CN107218214A (en) * 2017-07-03 2017-09-29 重庆洪量泵业有限公司 One kind deformation scraping blade displacement pump
CN110735795B (en) * 2019-11-19 2021-04-06 西安理工大学 Annular sealing structure for rotor end face of Roots blower
DE102020111306A1 (en) 2020-04-24 2021-10-28 Dt Swiss Ag Bicycle component with an adjustable seat post device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE105715C (en) *
FR96392E (en) * 1968-11-07 1972-06-16 Eisenwerke Kaiserslautern G M Rotary piston pump for viscous products.
DE3707722A1 (en) * 1987-03-11 1988-09-29 Alois Boerger Rotor pump, especially for pumping liquids containing solids

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2304380A (en) * 1995-08-17 1997-03-19 Tochigi Fuji Sangyo Kk Chucking flats formed in the end of a hollow toothed screw rotor.
GB2304380B (en) * 1995-08-17 1998-06-10 Tochigi Fuji Sangyo Kk Fluid machine
DE19802264C1 (en) * 1998-01-22 1998-11-26 Boerger Gmbh Rotary pump for solid suspensions in fluids
WO2001088377A1 (en) 2000-05-18 2001-11-22 Hugo Vogelsang Maschinenbau Gmbh Rotating piston pump
DE102008045440A1 (en) 2008-09-02 2010-03-04 Börger GmbH Rotary piston for use in rotary piston pump for conveying fibrous material, has radial sealing area laminarly designed as cylinder barrel section surface, and linear recess arranged in radial and axial sealing areas
DE102008045440B4 (en) * 2008-09-02 2017-02-09 Börger GmbH Rotary piston of a rotary lobe pump and rotary lobe pump

Also Published As

Publication number Publication date
EP0599333A1 (en) 1994-06-01
DE9216170U1 (en) 1993-01-14
DE59302906D1 (en) 1996-07-18
JPH06257574A (en) 1994-09-13
JP3363189B2 (en) 2003-01-08

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