EP1777414B1 - Magnetic pump drive - Google Patents

Magnetic pump drive Download PDF

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Publication number
EP1777414B1
EP1777414B1 EP05023064.8A EP05023064A EP1777414B1 EP 1777414 B1 EP1777414 B1 EP 1777414B1 EP 05023064 A EP05023064 A EP 05023064A EP 1777414 B1 EP1777414 B1 EP 1777414B1
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EP
European Patent Office
Prior art keywords
connection
path network
pump drive
magnetic pump
drive according
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Revoked
Application number
EP05023064.8A
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German (de)
French (fr)
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EP1777414A1 (en
Inventor
Thomas Eschner
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Klaus Union GmbH and Co KG
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Klaus Union GmbH and Co KG
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Application filed by Klaus Union GmbH and Co KG filed Critical Klaus Union GmbH and Co KG
Priority to ES05023064T priority Critical patent/ES2741644T3/en
Priority to EP05023064.8A priority patent/EP1777414B1/en
Publication of EP1777414A1 publication Critical patent/EP1777414A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/026—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/025—Details of the can separating the pump and drive area

Definitions

  • the invention relates to a magnetic pump drive with a driver driven by a motor, a rotor comprised by the driver to which the pump impeller is connected, drivers and travelers being occupied by opposing magnets, and a fixed containment shell formed of an outer pot and an inner pot, which surrounds the rotor, communicates on its inside with the pumped fluid of the pump, is sealed off from the pump housing, and by the force of the magnets for effecting the drive from the driver the runner passes, where the outer pot and the inner pot are connected to each other at their open end faces such that a gap between the outer pot and the inner pot is sealed against the pumped fluid of the pump.
  • the opposite, attracting magnets of the driver and the rotor must be arranged close to each other, in which case production tolerances and, above all, safety considerations play a role.
  • a distance of about 4 mm is usually present between the opposing permanent magnets, wherein this so-called air gap is traversed by the cylindrical part of the gap pot, which usually has a thickness of 1-2 mm.
  • the containment shell When bearing damage to the driver and the runner and in case of unforeseen solid infestation of the fluid, it can happen again and again that the containment shell is damaged, so that until then held under sealing fluid enters the open This danger is known to be encountered, the containment shell double-walled, or to provide an air-filled or evacuated intermediate space, in particular a road network, between two contacting gap pots, wherein in each case a display device can be connected to the intermediate space or to the road network, with the aid of which a pressure change and thus damage can be detected.
  • EP 0 268 013 A in that the outer pot and the inner pot touch at least in the region of the cylindrical lateral surfaces and within the contact zone small nubs or projections are arranged on the contacting surfaces.
  • a liquid medium can be arranged between the outer pot and the inner pot.
  • the invention has for its object to provide a magnetic pump drive of the type mentioned, in which also the heat generated in the outer pot is reliably dissipated.
  • Characteristic of the magnetic pump drive according to the invention is the arrangement of a liquid medium in the space between the outer pot and the inner pot.
  • a liquid medium is in the context of the application while any medium that has sufficient viscosity, such as.
  • As gaps, all areas of the containment shell between the outer pot and the inner pot are considered, where they do not abut each other. This can result both due to the existing surface roughness, as well as from a selected arrangement and / or configuration of the facing contact surfaces of the outer and inner pot.
  • the arrangement of the liquid medium in the interstices increases the thermal conductivity between the outer pot and inner pot and thus ensures that - even with large-volume pumps - the entire accumulating during operation of the pump in the outer pot heat can be reliably discharged through the inner pot to the medium to be delivered. Thus, damage to the pump will result thermally induced deformations of the containment shell effectively prevented. It can be dispensed with an expensive surface treatment of the outer and inner pot to increase the thermal conductivity. At their open end faces of the inner pot and the outer pot are connected to each other, for example, glued or welded, that the liquid medium can not escape from the gap.
  • the liquid medium to be used can basically be chosen freely, wherein application-specific different media can be used. If the interstices result solely from the surface roughness of the inner and outer pot, the use of a highly flowable liquid medium is recommended, whereas in the case of the existence of defined interstices, liquid media having a lower flow behavior or pasty masses can also be used.
  • the liquid media used have a particularly good thermal conductivity, in particular thermally conductive oils are characterized by their special fluidity and high thermal conductivity of more than 1w / m ⁇ , whereby a particularly good heat dissipation is ensured.
  • the outer pot and the inner pot contact each other at least in the area of the cylindrical lateral surface, and within this contact zone, a path network forming the intermediate space is embedded in the contacting surfaces, the road network being a cut-in helix.
  • a defined road network allows a particularly reliable determination of damage to the inner or outer pot, in particular of pressure changes. Damage can be detected particularly early and with high reliability, in particular false alarms being prevented in a special way.
  • a particularly effective and statically favorable road network results when, according to an advantageous embodiment of the invention, the road network is embedded in the inside of the outer pot.
  • the road network consists of a spiral cut into the containment shell, which preferably opens at the open end of the double-shell containment shell into an externally accessible first port for filling the road network with the liquid medium. Since damage, especially of the inner pot, occur primarily as recessed grooves on a circular path, there is a very high probability that at least one point of the coil is detected in case of damage to the inner pot when using a helix as a road network. This allows with the help of a monitoring of the road network with a basically arbitrarily designed device for detecting damage to the inner or outer pot, in particular via a pressure sensing the triggering of an immediate alarm.
  • the use of a first connection provided according to an advantageous development already constitutes a convenient filling possibility of the gap or of the road network.
  • this connection can be used after filling to arrange a device for detecting damage to the inner or outer pot, in particular pressure measuring device .
  • the intermediate space, in particular the road network is connected to an externally accessible second port for removing the liquid medium from the road network and / or for venting the road network, the second port preferably at the end opposite the first port the road network is arranged.
  • the static arrangement of the liquid medium is sufficient to ensure sufficient heat conduction from the outer pot.
  • the arrangement of a second connection which can be used for venting, so that a particularly simple filling by the first connection is possible, but can also be used to build a cooling circuit in which the liquid medium circulates through the network of paths and thereby accumulating heat removed. This can be particularly advantageous if, contrary to expectations, by the arrangement of the liquid Medium reached thermal conductivity in special applications is not sufficient to dissipate all heat from the outer and / or inner pot.
  • the second connection in the case of use as a vent opening, can be used to accommodate a device for detecting damage to the containment shell, in particular a pressure-measuring device. If no such device is provided, as in the case of the use of a single port, the ports may be sealed after filling the gaps.
  • the intermediate space in particular the road network, with an externally accessible third port for connecting a device for detecting damage to the inner or outer pot, in particular for pressure measurement in the road network and / or a fourth port accessible from the outside for cleaning the gap, in particular the road networks connected.
  • the arrangement of a separate connection for a display device makes it possible to select this, for example a pressure measuring device, regardless of the configuration of the connection, since connection compatibilities can be disregarded.
  • this third connection can be used to connect the display device, if monitoring of the inner and outer pot is not already carried out on the circulation-causing device.
  • a flushing of the intermediate space can take place through the first, second or third connection, wherein flushing is required when, as a consequence of a leak, the medium to be delivered has entered the intermediate space and has to be transported out of it before the pump can be opened , This is particularly necessary if the medium to be delivered has toxic properties.
  • the arrangement of a separate fourth terminal according to this embodiment of the invention allows a particularly good adaptation to be connected to the fourth terminal cleaning device.
  • FIG. 1 shows: Fig. Leasse cross-section through a magnetic pump drive with a double-shell containment shell.
  • FIG. 1 reproduced embodiment of the invention shows a coupling housing 1 to which the pump housing, not shown in detail, is fastened by means of tie rods in the rule.
  • an impeller 2 which is connected by means of a shaft 3 with an inner rotor 8.
  • the shaft 3 and the inner rotor 8 form an integral part.
  • the shaft 3 is supported by means of a thrust bearing 4 and with the help of lateral thrust washers 5 immediately behind the impeller 2, while the rotor 8 is guided by means of a separate radial bearing, which consists of a peripheral bearing ring 6 and a stationary bearing ring 7
  • a driver 10 is rotatably mounted, which is secured by means of a shaft nut 9 on a shaft only partially shown.
  • the driver 10 has a bell-shaped shape, and within the cavity is a double-shell containment shell 11, which in turn engages the rotor 8 like a bell.
  • permanent magnets 12 are mounted in pairs, wherein, based on each of the driver 10 or the rotor 8, the magnetic polarity alternate. So there are a south pole of the driver 10 and a north pole of the rotor 8, next to a north pole of the driver 10 and a south pole of the rotor 8 opposite, etc. With the help of these permanent magnets 12, the driving force of an electric motor, not shown here via the driver 10th transferred to the rotor 8 and thus to the impeller 2.
  • the double-shell containment shell 11 consists of an outer pot 15 and an inner pot 16, which are inserted into one another and abut each other in their cylindrical areas. This can also be done under bias. In the bottom area, a distance between the two pots 15 and 16 is present, which is a few tenths of a millimeter, that is less than in the Fig. 1 In the cylindrical shell region of the outer pot 15 and of the inner pot 16, there is one into the inner side of the outer pot 15 incised or embossed coil 17, which opens into a collection chamber-like annular space 18. It is so far pronounced that the space between the two bottoms of the pots 15, 16 is in flow-conducting connection with the coil 17.
  • a line for filling the coil and the annular space can be connected with a liquid medium.
  • port 20 may be used to connect a pressure gauge, liquid sensor or other pressure gauges which will ensure the integrity of both pots 15, 16 in such a way as to trigger an alarm whenever the coil 17 and / or the coil 17 are de-energized Gap between the floors connection with the pumped medium (damaged inner pot 16) or with the atmosphere (damaged outer pot 15) gets.
  • the coil 17 can be designed approximately arbitrarily, as long as sufficient heat conduction through the arranged in the coil 17 liquid medium and a sufficient control function is possible. For a sufficient safe monitoring a depth of a few tenths of a millimeter, while the slope should be chosen so that on the one hand a good detection of all surface areas is present, on the other hand, however, the outer pot 15 is not weakened unnecessarily. In the illustrated embodiment, both the outer pot 15 and the inner pot 16 are able to withstand the operating pressure of the pump alone, so that there is no risk of bursting in the damage of one of the two pots 15, 16.

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

Description

Die Erfindung betrifft einen magnetischen Pumpenantrieb, mit einem von einem Motor angetriebenen Treiber,
einem von dem Treiber umfassten Läufer, mit dem das Pumpenlaufrad verbunden ist, wobei Treiber und Läufer mit sich gegenüberliegenden Magneten besetzt sind, und
einem feststehenden, aus einem Außentopf und einem Innentopf gebildeten Spalttopf, der den Läufer umschließt, auf seiner Innenseite mit dem Fördermedium der Pumpe in Verbindung steht, gegenüber dem Pumpengehäuse abgedichtet ist, und durch den die Kraft der Magnete zur Bewirkung des Antriebes von dem Treiber auf den Läufer hindurchgeht, wobei
der Außentopf und der Innentopf an ihren offenen Stirnseiten derart miteinander verbunden sind, dass ein Zwischenraum zwischen dem Außentopf und dem Innentopf gegenüber dem Fördermedium der Pumpe abgedichtet ist.The invention relates to a magnetic pump drive with a driver driven by a motor,
a rotor comprised by the driver to which the pump impeller is connected, drivers and travelers being occupied by opposing magnets, and
a fixed containment shell formed of an outer pot and an inner pot, which surrounds the rotor, communicates on its inside with the pumped fluid of the pump, is sealed off from the pump housing, and by the force of the magnets for effecting the drive from the driver the runner passes, where
the outer pot and the inner pot are connected to each other at their open end faces such that a gap between the outer pot and the inner pot is sealed against the pumped fluid of the pump.

Derartige Pumpenantriebe sind seit langem bekannt. Sie haben sich in der chemischen, insbesondere petrochemischen Industrie sowie in der Reaktortechnik als zuverlässig und betriebssicher erwiesen, wenn es darum geht, eine Wellendichtung herkömmlicher Art zu vermeiden. Infolge der eingangs genannten Pumpenantriebe sind nur noch statische Dichtungen vorhanden, die problemlos beherrscht werden und kein Risiko bezüglich eines ungewollten Flüssigkeitsaustritts bergen.Such pump drives have long been known. They have proven to be reliable and reliable in the chemical, in particular petrochemical and reactor technology, when it comes to avoiding a shaft seal of conventional type. As a result of the pump drives mentioned above, only static seals are present, which are easily controlled and do not pose any risk of unwanted liquid leakage.

Aus Gründen eines guten Wirkungsgrades müssen die sich gegenüberliegenden, einander anziehenden Magnete des Treibers und des Läufers nah aneinander angeordnet sein, wobei hier Fertigungstoleranzen und vor allen Dingen Sicherheitsüberlegungen eine Rolle spielen. Im Ergebnis ist zwischen den sich gegenüberliegen Permanentmagneten in der Regel ein Abstand von ca. 4 mm vorhanden, wobei dieser sogenannte Luftspalt von dem zylindrischen Teil des Spalttopfes durchzogen wird, welcher in der Regel eine Dicke von 1-2 mm aufweist.For reasons of good efficiency, the opposite, attracting magnets of the driver and the rotor must be arranged close to each other, in which case production tolerances and, above all, safety considerations play a role. As a result, a distance of about 4 mm is usually present between the opposing permanent magnets, wherein this so-called air gap is traversed by the cylindrical part of the gap pot, which usually has a thickness of 1-2 mm.

Bei Lagerschäden am Treiber und am Läufer sowie bei unvorhergesehenem Feststoffbefall des Fördermediums kann es immer wieder vorkommen, dass der Spalttopf beschädigt wird, so dass das bis dahin unter Abdichtung gehaltene Fördermedium ins Freie gelangt Dieser Gefahr wird bekanntermaßen dadurch begegnet, den Spalttopf doppelwandig auszubilden, bzw. zwischen zwei sich berührenden Spalttöpfen einen luftgefüllten oder evakuierten Zwischenraum, insbesondere ein Wegenetz vorzusehen, wobei an dem Zwischenraum, bzw. an das Wegenetz jeweils eine Anzeigevorrichtung anschließbar ist, mit deren Hilfe eine Druckänderung und damit eine Beschädigung feststellbar ist.When bearing damage to the driver and the runner and in case of unforeseen solid infestation of the fluid, it can happen again and again that the containment shell is damaged, so that until then held under sealing fluid enters the open This danger is known to be encountered, the containment shell double-walled, or to provide an air-filled or evacuated intermediate space, in particular a road network, between two contacting gap pots, wherein in each case a display device can be connected to the intermediate space or to the road network, with the aid of which a pressure change and thus damage can be detected.

Bei den bekannten magnetischen Pumpenantrieben, von denen einer in der EP 0 286 822 B1 beschrieben ist, werden systembedingt in dem Spalttopf Wirbelströme induziert, die in dem metallischen Material des Spalttopfes in Wärme umgesetzt werden. Insbesondere bei großvolumigen Pumpen kann zwar die im Innentopf anfallende Wärme über das zu fordernde Medium abgeführt werden. Die im Außentopf erzeugte Wärme kann jedoch nicht ausreichend über die den Außentopf umgebende Atmosphäre abgeleitet werden. Ferner ist auch die Wärmeleitfähigkeit zwischen dem Innentopf und dem Außentopf infolge der luftgefüllten oder evakuierten Zwischenräume, insbesondere im Falle eines vorhandenen Wegenetzes unter ungünstigen Umständen, nicht ausreichend, um die in dem Außentopf anfallende Wärme über den Innentopf an das zu fordernde Medium abzugeben. Infolgedessen kommt es bei übermäßiger Erwärmung zu Verformungen des Außentopfes, die zu einer Beschädigung der Pumpe führen.In the known magnetic pump drives, one of which in the EP 0 286 822 B1 is described systemically induced eddy currents in the containment shell, which are converted into heat in the metallic material of the containment shell. In particular, in the case of large-volume pumps, the heat accumulating in the inner pot can be dissipated via the medium to be demanded. However, the heat generated in the outer pot can not be sufficiently dissipated via the atmosphere surrounding the outer pot. Furthermore, the thermal conductivity between the inner pot and the outer pot due to the air-filled or evacuated spaces, especially in the case of an existing road network under unfavorable circumstances, not sufficient to deliver the heat in the outer pot via the inner pot to the medium to be challenged. As a result, excessive heating will cause deformation of the outer pot resulting in damage to the pump.

Um die Stabilität des Spalttopfes und die Wärmeübertragung zwischen Innentopf und Außentopf zu verbessern, schlägt die EP 0 268 013 A vor, dass sich der Außentopf und der Innentopf zumindest im Bereich der zylindrischen Mantelflächen berühren und innerhalb der Berührzone kleine Noppen oder Vorsprünge an den sich berührenden Flächen angeordnet sind. Zur Messung Anzeige von Undichtigkeiten kann zwischen dem Außentopf und dem Innentopf ein flüssiges Medium angeordnet sein. Eine zuverlässige und wirkungsvolle Feststellung von Beschädigungen des Innen- oder Außentopfs, insbesondere von Druckänderungen ist hierdurch jedoch nicht möglich. Beschädigungen sind so nicht früh und mit hoher Zuverlässigkeit feststellbar.To improve the stability of the can and the heat transfer between inner pot and outer pot, suggests EP 0 268 013 A in that the outer pot and the inner pot touch at least in the region of the cylindrical lateral surfaces and within the contact zone small nubs or projections are arranged on the contacting surfaces. To measure leaks, a liquid medium can be arranged between the outer pot and the inner pot. A reliable and effective determination of damage to the inner or outer pot, in particular of pressure changes is not possible thereby. Damage can not be detected early and with high reliability.

Der Erfindung liegt die Aufgabe zugrunde, einen magnetischen Pumpenantrieb der eingangs genannten Art bereitzustellen, bei dem auch die in dem Außentopf erzeugte Wärme zuverlässig abgeführt wird.The invention has for its object to provide a magnetic pump drive of the type mentioned, in which also the heat generated in the outer pot is reliably dissipated.

Die Erfindung löst die Aufgabe durch einen magnetischen Pumpenantrieb mit dem Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen des magnetischen Pumpenantriebs sind in den abhängigen Ansprüchen angegeben. Kennzeichnend für den erfindungsgemäßen magnetischen Pumpenantrieb ist die Anordnung eines flüssigen Mediums in dem Zwischenraum zwischen dem Außentopf und dem Innentopf. Ein flüssiges Medium ist im Rahmen der Anmeldung dabei jedes Medium, das eine ausreichende Viskosität besitzt, wie z. B. Flüssigkeiten oder pastöse Massen, um selbstständig oder unter Druck in den oder die Zwischenräume zu gelangen. Als Zwischenräume werden dabei alle Bereiche des Spalttopfs zwischen dem Außentopf und dem Innentopf angesehen, an denen diese nicht aneinander anliegen. Dies kann sowohl aufgrund der vorhandenen Oberflächenrauhigkeiten, als auch aus einer gewählten Anordnung und/oder Ausgestaltung der einander zugewandten Kontaktflächen des Außen- und Innentopfes resultieren. Die Anordnung des flüssigen Mediums in den Zwischenräumen erhöht die Wärmeleitfähigkeit zwischen dem Außentopf und Innentopf und gewährleistet so, dass - auch bei großvolumigen Pumpen - die gesamte im Betrieb der Pumpe im Außentopf anfallende Wärme zuverlässig über den Innentopf an das zu fördernde Medium abgegeben werden kann. Somit wird einer Beschädigung der Pumpe in Folge von wärmebedingten Verformungen des Spalttopfes wirksam vorgebeugt. Dabei kann auf eine kostenintensive Oberflächenbearbeitung des Außen- und Innentopfes zur Erhöhung der Wärmeleitfähigkeit verzichtet werden. An ihren offenen Stirnseiten sind der Innentopf und der Außentopf derart miteinander verbunden, bspw. verklebt oder verschweißt, dass das flüssige Medium nicht aus dem Zwischenraum austreten kann.The invention solves the problem by a magnetic pump drive with the features of claim 1. Advantageous developments of the magnetic pump drive are specified in the dependent claims. Characteristic of the magnetic pump drive according to the invention is the arrangement of a liquid medium in the space between the outer pot and the inner pot. A liquid medium is in the context of the application while any medium that has sufficient viscosity, such as. As liquids or pasty masses to get into the space or on its own or under pressure. As gaps, all areas of the containment shell between the outer pot and the inner pot are considered, where they do not abut each other. This can result both due to the existing surface roughness, as well as from a selected arrangement and / or configuration of the facing contact surfaces of the outer and inner pot. The arrangement of the liquid medium in the interstices increases the thermal conductivity between the outer pot and inner pot and thus ensures that - even with large-volume pumps - the entire accumulating during operation of the pump in the outer pot heat can be reliably discharged through the inner pot to the medium to be delivered. Thus, damage to the pump will result thermally induced deformations of the containment shell effectively prevented. It can be dispensed with an expensive surface treatment of the outer and inner pot to increase the thermal conductivity. At their open end faces of the inner pot and the outer pot are connected to each other, for example, glued or welded, that the liquid medium can not escape from the gap.

Unter den o. g. Voraussetzungen kann das zu verwendende flüssige Medium grundsätzlich frei gewählt werden, wobei anwendungsspezifisch unterschiedliche Medien zum Einsatz kommen können. Falls die Zwischenräume allein aufgrund der Oberflächenrauhigkeit des Innen- und Außentopfes resultieren, empfiehlt sich die Verwendung eines sehr fließfähigen flüssigen Mediums, wohingegen im Falle des Bestehens von definierten Zwischenräumen auch flüssige Medien mit einem geringeren Fließverhalten oder pastöse Massen verwendbar sind. Gemäß einer besonders vorteilhaften Ausgestaltung der Erfindung weisen die verwendeten flüssigen Medien eine besonders gute Wärmeleitfähigkeit auf, wobei insbesondere wärmeleitfähige Öle sich durch ihre besondere Fließfähigkeit und ihre hohe Wärmeleitfähigkeit von mehr als 1w/mκ auszeichnen, wodurch eine besonders gute Wärmeabfuhr gewährleistet wird.Among the o. G. Prerequisites, the liquid medium to be used can basically be chosen freely, wherein application-specific different media can be used. If the interstices result solely from the surface roughness of the inner and outer pot, the use of a highly flowable liquid medium is recommended, whereas in the case of the existence of defined interstices, liquid media having a lower flow behavior or pasty masses can also be used. According to a particularly advantageous embodiment of the invention, the liquid media used have a particularly good thermal conductivity, in particular thermally conductive oils are characterized by their special fluidity and high thermal conductivity of more than 1w / mκ, whereby a particularly good heat dissipation is ensured.

Grundsätzlich besteht die Möglichkeit, unabhängig von der Ausgestaltung der Kontaktflächen des Außen- und Innentopfes, an den mit dem flüssigen Medium gefüllten Zwischenraum eine Anzeigevorrichtung anzuschließen, mit deren Hilfe, bspw. durch eine Überwachung des Drucks im Zwischenraum, eine Beschädigung des Innen- oder Außentopfes feststellbar ist. Erfindungsgemäß berühren sich der Außentopf und der Innentopf zumindest im Bereich der zylindrischen Mantelfläche und innerhalb dieser Berührzone ist ein den Zwischenraum bildendes Wegenetz in die sich berührenden Flächen eingelassen, wobei das Wegenetz eine eingeschnittene Wendel ist. Ein definiertes Wegenetz ermöglicht dabei eine besonders zuverlässige Feststellung von Beschädigungen des Innen- oder Außentopfs, insbesondere von Druckänderungen. Beschädigungen sind besonders früh und mit hoher Zuverlässigkeit feststellbar, wobei insbesondere Fehlalarmen in besonderer Weise vorgebeugt wird.Basically, there is the possibility, regardless of the design of the contact surfaces of the outer and inner pot to connect to the filled with the liquid medium space a display device, with their help, for example. By monitoring the pressure in the space, damage to the inner or outer pot is detectable. According to the invention, the outer pot and the inner pot contact each other at least in the area of the cylindrical lateral surface, and within this contact zone, a path network forming the intermediate space is embedded in the contacting surfaces, the road network being a cut-in helix. A defined road network allows a particularly reliable determination of damage to the inner or outer pot, in particular of pressure changes. Damage can be detected particularly early and with high reliability, in particular false alarms being prevented in a special way.

Ein besonders wirkungsvolles und statisch günstiges Wegenetz ergibt sich dann, wenn nach einer vorteilhaften Weiterbildung der Erfindung das Wegenetz in die Innenseite des Außentopfes eingelassen ist. Insbesondere wenn das Wegenetz aus einer in den Spalttopf eingeschnittenen Wendel besteht, welche vorzugsweise am offenen Ende des doppelschaligen Spalttopfs in einen von außen zugänglichen ersten Anschluss zum Befüllen des Wegenetzes mit dem flüssigen Medium mündet. Da Beschädigungen, insbesondere des Innentopfs, vornehmlich als sich vertiefende Riefungen auf einer Kreisbahn auftreten, besteht bei der Verwendung einer Wendel als Wegenetz eine sehr hohe Wahrscheinlichkeit, dass mindestens eine Stelle der Wendel bei einer Beschädigung des Innentopfes erfasst wird. Das ermöglicht mit Hilfe einer Überwachung des Wegenetzes mit einer grundsätzlich beliebig ausgebildeten Vorrichtung zur Feststellung einer Beschädigung des Innen- oder Außentopfs, insbesondere über eine Druckabfragung die Auslösung eines sofortigen Alarms.A particularly effective and statically favorable road network results when, according to an advantageous embodiment of the invention, the road network is embedded in the inside of the outer pot. In particular, when the road network consists of a spiral cut into the containment shell, which preferably opens at the open end of the double-shell containment shell into an externally accessible first port for filling the road network with the liquid medium. Since damage, especially of the inner pot, occur primarily as recessed grooves on a circular path, there is a very high probability that at least one point of the coil is detected in case of damage to the inner pot when using a helix as a road network. This allows with the help of a monitoring of the road network with a basically arbitrarily designed device for detecting damage to the inner or outer pot, in particular via a pressure sensing the triggering of an immediate alarm.

Grundsätzlich stellt bereits die gemäß einer vorteilhaften Weiterbildung vorgesehene Verwendung eines ersten Anschlusses eine komfortable Befüllmöglichkeit des Zwischenraums bzw. des Wegenetzes dar. Darüber hinaus kann dieser Anschluss nach dem Befüllen zur Anordnung einer Vorrichtung zur Feststellung einer Beschädigung des Innen- oder Außentopfes, insbesondere Druckmesseinrichtung verwendet werden. Nach einer vorteilhaften Weiterbildung der Erfindung ist der Zwischenraum, insbesondere das Wegenetz, mit einem von außen zugänglichen zweiten Anschluss zur Abfuhr des flüssigen Mediums aus dem Wegenetz und/oder zur Entlüftung des Wegenetzes verbunden, wobei der zweite Anschluss vorzugsweise an dem dem ersten Anschluss gegenüberliegenden Ende des Wegenetzes angeordnet ist.In principle, the use of a first connection provided according to an advantageous development already constitutes a convenient filling possibility of the gap or of the road network. In addition, this connection can be used after filling to arrange a device for detecting damage to the inner or outer pot, in particular pressure measuring device , According to an advantageous development of the invention, the intermediate space, in particular the road network, is connected to an externally accessible second port for removing the liquid medium from the road network and / or for venting the road network, the second port preferably at the end opposite the first port the road network is arranged.

Grundsätzlich reicht bereits die statische Anordnung des flüssigen Mediums aus, um eine ausreichende Wärmeleitung aus dem Außentopf zu gewährleisten. Die Anordnung eines zweiten Anschlusses, welcher zur Entlüftung verwenbar ist, so dass ein besonders einfaches Befüllen durch den ersten Anschluss möglich ist, kann jedoch auch dazu genutzt werden, um einen Kühlkreislauf aufzubauen, bei dem das flüssige Medium durch das Wegenetz zirkuliert und dabei anfallende Wärme abtransportiert. Dies kann insbesondere dann von Vorteil sein, wenn wider Erwarten die durch die Anordnung des flüssigen Mediums erreichte Wärmeleitfähigkeit in speziellen Anwendungsfällen nicht ausreicht, um sämtliche Wärme aus dem Außen- und/oder Innentopf abzuführen.Basically, even the static arrangement of the liquid medium is sufficient to ensure sufficient heat conduction from the outer pot. However, the arrangement of a second connection, which can be used for venting, so that a particularly simple filling by the first connection is possible, but can also be used to build a cooling circuit in which the liquid medium circulates through the network of paths and thereby accumulating heat removed. This can be particularly advantageous if, contrary to expectations, by the arrangement of the liquid Medium reached thermal conductivity in special applications is not sufficient to dissipate all heat from the outer and / or inner pot.

Im Falle der Verwendung als Entlüftungsöffnung kann der zweite Anschluss, wie auch der erste Anschluss, zur Aufnahme einer Vorrichtung zur Feststellung von Beschädigungen des Spalttopfs, insbesondere einer Druckmesseinrichtung verwendet werden. Falls keine solche Vorrichtung vorgesehen ist, können die Anschlüsse, wie auch im Falle der Verwendung eines einzigen Anschlusses, nach dem Befüllen der Zwischenräume versiegelt werden.In the case of use as a vent opening, the second connection, as well as the first connection, can be used to accommodate a device for detecting damage to the containment shell, in particular a pressure-measuring device. If no such device is provided, as in the case of the use of a single port, the ports may be sealed after filling the gaps.

Nach einer besonders vorteilhaften Weiterbildung der Erfindung ist der Zwischenraum, insbesondere das Wegenetz, mit einem von außen zugänglichen dritten Anschluss zum Anschluss einer Vorrichtung zur Feststellung von Beschädigungen des Innen- oder Außentopfs, insbesondere zur Druckmessung im Wegenetz und/oder einem von außen zugänglichen vierten Anschluss zur Reinigung des Zwischenraums, insbesondere des Wegenetze, verbunden. Die Anordnung eines separaten Anschlusses für eine Anzeigevorrichtung ermöglicht es, diese, bspw. eine Druckmesseinrichtung unabhängig von der Ausgestaltung des Anschlusses zu wählen, da Anschlusskompatibilitäten unberücksichtigt bleiben können. Überdies kann dieser dritte Anschluss im Falle der vorteilhafterweise vorzusehenden Zirkulation des flüssigen Mediums zum Anschluss der Anzeigevorrichtung verwendet werden, wenn eine Überwachung des Innen- und Außentopfes nicht bereits an der die Zirkulation bewirkenden Vorrichtung erfolgt.According to a particularly advantageous embodiment of the invention, the intermediate space, in particular the road network, with an externally accessible third port for connecting a device for detecting damage to the inner or outer pot, in particular for pressure measurement in the road network and / or a fourth port accessible from the outside for cleaning the gap, in particular the road networks connected. The arrangement of a separate connection for a display device makes it possible to select this, for example a pressure measuring device, regardless of the configuration of the connection, since connection compatibilities can be disregarded. Moreover, in the case of advantageously provided circulation of the liquid medium, this third connection can be used to connect the display device, if monitoring of the inner and outer pot is not already carried out on the circulation-causing device.

Grundsätzlich kann eine Spülung des Zwischenraums durch den ersten, zweiten oder dritten Anschluss erfolgen, wobei eine Spülung dann erforderlich ist, wenn in Folge eines Lecks das zu fördernde Medium in den Zwischenraum gelangt ist und aus diesem herausbefördert werden muss, bevor die Pumpe geöffnet werden kann. Dies ist insbesondere dann zwingend erforderlich, wenn das zu fördernde Medium toxische Eigenschaften besitzt. Die Anordnung eines separaten vierten Anschlusses gemäß dieser Weiterbildung der Erfindung ermöglicht eine besonders gute Anpassung an die an den vierten Anschluss anzuschließende Reinigungsvorrichtung.In principle, a flushing of the intermediate space can take place through the first, second or third connection, wherein flushing is required when, as a consequence of a leak, the medium to be delivered has entered the intermediate space and has to be transported out of it before the pump can be opened , This is particularly necessary if the medium to be delivered has toxic properties. The arrangement of a separate fourth terminal according to this embodiment of the invention allows a particularly good adaptation to be connected to the fourth terminal cleaning device.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeichnung beschrieben. Die Zeichnung zeigt: Fig. leine Querschnittsansicht durch einen magnetischen Pumpenantrieb mit einem doppelschaligen Spalttopf.Hereinafter, an embodiment of the invention will be described with reference to a drawing. The drawing shows: Fig. Leasse cross-section through a magnetic pump drive with a double-shell containment shell.

Das in der Fig. 1 wiedergegebene Ausführungsbeispiel der Erfindung zeigt ein Kupplungsgehäuse 1, an dem in der Regel das nicht näher dargestellte Pumpengehäuse mit Hilfe von Zugankern befestigt ist. Innerhalb des Pumpengehäuses rotiert ein Laufrad 2, das mit Hilfe einer Welle 3 mit einem Innenläufer 8 verbunden ist. Die Welle 3 und der Innenläufer 8 bilden einen integralen Bestandteil. Die Welle 3 ist mit Hilfe eines Axiallagers 4 und mit Hilfe seitlicher Axiallagerscheiben 5 unmittelbar hinter dem Laufrad 2 gelagert, während der Läufer 8 mit Hilfe eines gesonderten Radiallagers geführt ist, das aus einem umlaufenden Lagerring 6 und einem feststehenden Lagerring 7 bestehtThat in the Fig. 1 reproduced embodiment of the invention shows a coupling housing 1 to which the pump housing, not shown in detail, is fastened by means of tie rods in the rule. Within the pump housing rotates an impeller 2, which is connected by means of a shaft 3 with an inner rotor 8. The shaft 3 and the inner rotor 8 form an integral part. The shaft 3 is supported by means of a thrust bearing 4 and with the help of lateral thrust washers 5 immediately behind the impeller 2, while the rotor 8 is guided by means of a separate radial bearing, which consists of a peripheral bearing ring 6 and a stationary bearing ring 7

Innerhalb des Kupplungsgehäuses 1 ist ein Treiber 10 drehbar gelagert, der mit Hilfe einer Wellenmutter 9 auf einer nur partiell dargestellten Welle gesichert ist. Der Treiber 10 hat eine glockenförmige Gestalt, und innerhalb der Höhlung befindet sich ein doppelschaliger Spalttopf 11, der wiederum glockenartig den Läufer 8 übergreift. Auf der Außenseite des Läufers 8 sowie auf der Innenseite des Treibers 10 sind Permanentmagnete 12 paarweise angebracht, wobei sich, bezogen auf jeweils den Treiber 10 oder den Läufer 8, die magnetischen Polungen abwechseln. Es liegen sich also ein Südpol des Treibers 10 und ein Nordpol des Läufers 8, daneben ein Nordpol des Treibers 10 und ein Südpol des Läufers 8 gegenüber usw. Mit Hilfe dieser Permanentmagnete 12 wird die Antriebskraft von einem, hier nicht dargestellten Elektromotor über den Treiber 10 auf den Läufer 8 und damit auf das Pumpenrad 2 übertragen.Within the clutch housing 1, a driver 10 is rotatably mounted, which is secured by means of a shaft nut 9 on a shaft only partially shown. The driver 10 has a bell-shaped shape, and within the cavity is a double-shell containment shell 11, which in turn engages the rotor 8 like a bell. On the outside of the rotor 8 and on the inside of the driver 10 permanent magnets 12 are mounted in pairs, wherein, based on each of the driver 10 or the rotor 8, the magnetic polarity alternate. So there are a south pole of the driver 10 and a north pole of the rotor 8, next to a north pole of the driver 10 and a south pole of the rotor 8 opposite, etc. With the help of these permanent magnets 12, the driving force of an electric motor, not shown here via the driver 10th transferred to the rotor 8 and thus to the impeller 2.

Der doppelschalige Spalttopf 11 besteht aus einem Außentopf 15 sowie aus einem Innentopf 16, die ineinandergesteckt sind und in ihren zylindrischen Bereichen aneinander anliegen. Dies kann auch unter Vorspannung erfolgen. Im Bodenbereich ist ein Abstand zwischen beiden Töpfen 15 und 16 vorhanden, der wenige zehntel Millimeter beträgt, also geringer ist als in der Fig. 1 dargestellt In dem zylindrischen Mantelbereich des Außentopfes 15 sowie des Innentopfes 16 befindet sich eine in die Innenseite des Außentopfes 15 eingeschnittene bzw. eingeprägte Wendel 17, die in einen sammelkammerartigen Ringraum 18 mündet. Sie ist soweit ausgeprägt, dass der Zwischenraum zwischen den beiden Böden der Töpfe 15, 16 in strömungsleitender Verbindung mit der Wendel 17 steht. Zu dem Ringraum 18 führt eine Bohrung 19, die wiederum Verbindung zu einem Anschluss 20 hat An diesen Anschluss 20 können eine Leitung zum Befüllen der Wendel und des Ringraums mit einem flüssigen Medium angeschlossen werden. Nach der Befüllung kann der Anschluss 20 zum Anschluss eines Manometers, eines Flüssigkeitsfühlers oder anderer Druckmesseinrichtungen verwendet werden, die eine Überwachung der Unversehrtheit beider Töpfe 15, 16 in der Weise bewirken, dass immer dann ein Alarm ausgelöst wird, wenn die Wendel 17 bzw. der Zwischenraum zwischen den Böden Verbindung mit dem Fördermedium (beschädigter Innentopf 16) bzw. mit der Atmosphäre (beschädigter Außentopf 15) bekommt.The double-shell containment shell 11 consists of an outer pot 15 and an inner pot 16, which are inserted into one another and abut each other in their cylindrical areas. This can also be done under bias. In the bottom area, a distance between the two pots 15 and 16 is present, which is a few tenths of a millimeter, that is less than in the Fig. 1 In the cylindrical shell region of the outer pot 15 and of the inner pot 16, there is one into the inner side of the outer pot 15 incised or embossed coil 17, which opens into a collection chamber-like annular space 18. It is so far pronounced that the space between the two bottoms of the pots 15, 16 is in flow-conducting connection with the coil 17. To the annular space 18 leads a bore 19, which in turn has a connection to a connection 20 to this connection 20, a line for filling the coil and the annular space can be connected with a liquid medium. After filling, port 20 may be used to connect a pressure gauge, liquid sensor or other pressure gauges which will ensure the integrity of both pots 15, 16 in such a way as to trigger an alarm whenever the coil 17 and / or the coil 17 are de-energized Gap between the floors connection with the pumped medium (damaged inner pot 16) or with the atmosphere (damaged outer pot 15) gets.

Die Wendel 17 kann annähernd beliebig gestaltet werden, solange eine ausreichende Wärmeleitung über das in der Wendel 17 angeordnete flüssige Medium und eine ausreichende Kontrollfunktion möglich ist. Für eine ausreichende sichere Überwachung reicht eine Tiefe von wenigen zehntel Millimetern aus, während die Steigung so gewählt werden sollte, dass einerseits eine gute Erfassung aller Flächenbereiche vorhanden ist, andererseits jedoch der Außentopf 15 nicht unnötig geschwächt wird. In dem dargestellten Ausführungsbeispiel sind sowohl der Außentopf 15 als auch der Innentopf 16 in der Lage, den Betriebsdruck der Pumpe allein zu widerstehen, so dass bei der Beschädigung des einen der beiden Töpfe 15, 16 keine Berstgefahr besteht.The coil 17 can be designed approximately arbitrarily, as long as sufficient heat conduction through the arranged in the coil 17 liquid medium and a sufficient control function is possible. For a sufficient safe monitoring a depth of a few tenths of a millimeter, while the slope should be chosen so that on the one hand a good detection of all surface areas is present, on the other hand, however, the outer pot 15 is not weakened unnecessarily. In the illustrated embodiment, both the outer pot 15 and the inner pot 16 are able to withstand the operating pressure of the pump alone, so that there is no risk of bursting in the damage of one of the two pots 15, 16.

Claims (10)

  1. Magnetic pump drive having
    - a driver (10) which is driven by a motor,
    - a rotor (8) which is surrounded by the driver (10) and to which the pump impeller (2) is connected, wherein the driver (10) and rotor (8) are equipped with magnets (12) situated opposite one another, and
    - a stationary containment can (11) which is formed from an outer can (15) and an inner can (16), encloses the rotor (8), is in connection on its inner side with the delivery medium of the pump and is sealed off with respect to the pump housing (1), and through which the force of the magnets (12) for effecting the drive passes from the driver (10) to the rotor (8), wherein
    - the outer can (15) and the inner can (16) are connected to one another at their open end sides such that an intermediate space between the outer can (15) and the inner can (16) is sealed off with respect to the delivery medium of the pump, wherein a liquid medium is arranged between the outer can (15) and the inner can (16), wherein the liquid medium is formed such that it fills the intermediate space between the outer can (15) and the inner can (16), wherein the outer can (15) and the inner can (16) are in contact at least in the region of the cylindrical casing surfaces and, within the contact zone, a path network (17) forming the intermediate space is made in the surfaces in contact with one another,
    characterized
    in that the path network (17) consists of a spiral (17) cut into the containment can (15, 16).
  2. Magnetic pump drive according to Claim 1, characterized in that the liquid medium has good thermal conductivity.
  3. Magnetic pump drive according to Claim 1 or 2, characterized in that thermally conductive oils are able to be used as liquid medium.
  4. Magnetic pump drive according to one of the preceding claims, characterized in that the path network (17) is made in the outer can (15).
  5. Magnetic pump drive according to one of the preceding claims, characterized in that the intermediate space, in particular the path network (17), is connected to at least one externally accessible first connection (20) for the filling of the path network (17) with the liquid medium.
  6. Magnetic pump drive according to one of the preceding claims, characterized in that the intermediate space, in particular the path network (17), is connected to an externally accessible second connection for the removal of the liquid medium from the path network and/or for the deaeration of the path network (17), said second connection preferably being arranged at that end of the path network (17) which is situated opposite the first connection (20).
  7. Magnetic pump drive according to one of the preceding claims, characterized in that the intermediate space, in particular the path network (17), is connected to an externally accessible third connection for the connection of a device for establishing damage to the inner and outer cans, in particular for measuring pressure in the path network (17), and/or to an externally accessible fourth connection for the cleaning of the intermediate space, in particular the path network (17) .
  8. Magnetic pump drive according to one of Claims 5 to 7, characterized in that a device for measuring pressure is connected to a connection (20), in particular to the third connection.
  9. Magnetic pump drive according to one of the preceding claims, characterized in that the path network (17) opens out into a collecting chamber (18), which is connected to the first connection (20) via a bore (19).
  10. Magnetic pump drive according to one of the preceding claims, characterized in that the wall thickness of the outer can (15) is sufficient for the sole control of the operating pressure and the wall thickness of the inner can (16) is essentially freely selectable.
EP05023064.8A 2005-10-21 2005-10-21 Magnetic pump drive Revoked EP1777414B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES05023064T ES2741644T3 (en) 2005-10-21 2005-10-21 Magnetic pump drive
EP05023064.8A EP1777414B1 (en) 2005-10-21 2005-10-21 Magnetic pump drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05023064.8A EP1777414B1 (en) 2005-10-21 2005-10-21 Magnetic pump drive

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EP1777414A1 EP1777414A1 (en) 2007-04-25
EP1777414B1 true EP1777414B1 (en) 2019-05-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2503276B (en) * 2012-06-22 2019-05-08 Cummins Ltd Magnetic coupling with fluid cooled barrier
DE202012006480U1 (en) 2012-07-06 2012-08-06 Ruhrpumpen Gmbh Double-walled containment shell of a magnetic coupling, in particular a magnetic coupling pump
DE102012017322A1 (en) 2012-09-03 2014-03-06 Klaus Union Gmbh & Co. Kg Stationary containment shell for magnetically-operated clutch pump, has shell main portion whose outer and inner sides are applied with coating consisting of tungsten carbide so that shell is mechanically stabilized
DE102012019423B3 (en) 2012-10-02 2013-12-05 Dickow-Pumpen Kg Double can
DE102019002797A1 (en) * 2019-04-17 2020-10-22 KSB SE & Co. KGaA Containment shell
CN117646727B (en) * 2024-01-29 2024-04-16 烟台恒邦泵业有限公司 Vertical multistage magnetic drive pump

Citations (3)

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EP0268013A2 (en) 1986-11-20 1988-05-25 Reinecker, Heyko Canned motor pump or pump with an encased magnetic coupling
EP0268015A2 (en) 1986-11-20 1988-05-25 HERMETIC-PUMPEN GmbH Canned motor pump or pump with an encased magnetic coupling
EP0286822A2 (en) * 1987-04-11 1988-10-19 Franz Klaus Union Armaturen Pumpen GmbH & Co. Magnetic pump drive

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FR1552305A (en) * 1967-12-15 1969-01-03
SU684679A2 (en) * 1978-01-20 1979-09-05 Fedorov Viktor F Stator protective sleeve
EP0164798A1 (en) * 1981-09-01 1985-12-18 George Andrew Olah Process for the preparation of methyl monohalides

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0268013A2 (en) 1986-11-20 1988-05-25 Reinecker, Heyko Canned motor pump or pump with an encased magnetic coupling
EP0268015A2 (en) 1986-11-20 1988-05-25 HERMETIC-PUMPEN GmbH Canned motor pump or pump with an encased magnetic coupling
EP0286822A2 (en) * 1987-04-11 1988-10-19 Franz Klaus Union Armaturen Pumpen GmbH & Co. Magnetic pump drive
EP0286822B1 (en) 1987-04-11 1991-07-24 Franz Klaus Union Armaturen Pumpen GmbH & Co. Magnetic pump drive

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EP1777414A1 (en) 2007-04-25

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