EP2871363B1 - Gear pump with a sealing assembly - Google Patents

Gear pump with a sealing assembly Download PDF

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Publication number
EP2871363B1
EP2871363B1 EP13191707.2A EP13191707A EP2871363B1 EP 2871363 B1 EP2871363 B1 EP 2871363B1 EP 13191707 A EP13191707 A EP 13191707A EP 2871363 B1 EP2871363 B1 EP 2871363B1
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EP
European Patent Office
Prior art keywords
recess
gear pump
sealing
cavity
flushing medium
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EP13191707.2A
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German (de)
French (fr)
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EP2871363A1 (en
Inventor
René Triebe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maag Pump Systems AG
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Maag Pump Systems AG
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Publication date
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Priority to EP13191707.2A priority Critical patent/EP2871363B1/en
Priority to CN201410558029.1A priority patent/CN104632614B/en
Publication of EP2871363A1 publication Critical patent/EP2871363A1/en
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Publication of EP2871363B1 publication Critical patent/EP2871363B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons

Definitions

  • the present invention relates to a gear pump with a sealing arrangement and a method for operating the gear pump.
  • Gear pumps are often used as delivery devices below polymerization reactors. The task of these gear pumps is to discharge the finished reaction product from the reactor and convey it to further system components.
  • the critical (possibly leaky) process components eg the gear pump
  • the relevant system components are encompassed, for example, with a sheet metal jacket, with the space between the system components and the protective housing being flooded with pure nitrogen.
  • this has considerable disadvantages with regard to the price and also with regard to the accessibility of the system.
  • gas-filled metal O-rings are installed in the cover or the housing to seal sealing points between the gear pump housing and the gear pump cover.
  • the present invention was therefore based on the object of specifying a gear pump with a sealing arrangement that can be implemented simply and inexpensively, with the sealing arrangement optionally being able to be retrofitted to existing gear pumps.
  • the present invention relates first of all to a gear pump with an interior space which can be sealed off from an exterior space with a sealing arrangement.
  • the sealing arrangement comprises at least two parts to be sealed, each with a sealing surface, a recess being present in at least one of the sealing surfaces.
  • the sealing arrangement is characterized in that there is a sealing element which partially fills the recess, so that a cavity remains in the recess, that the recess with a source via a feed channel
  • Rinsing medium is connected, that the recess is connected via a discharge channel and that the cavity can be actively flushed through at least partially with flushing medium.
  • the gear pump is characterized in that the sealing element is an O-ring or a spiral seal. Further design variants of the gear pump according to the invention consist in that the supply channel and the discharge channel are at least partially designed as grooves in the sealing surface.
  • the feed channel and / or the discharge channel can easily be retrofitted to an existing recess with a sealing element by incorporating the feed and discharge channels into one or both sealing surfaces, for which a flex, for example, is ideally suited.
  • gear pump according to the invention consist in that the discharge channel is connected to a throttle valve at the outer end.
  • the cavity is flushed with flushing medium, which is then simply blown off into the environment via the throttle valve.
  • gear pump according to the invention consist in that the source, the supply channel, the recess or at least one cavity in the recess and the discharge channel form a closed flushing medium circuit.
  • gear pump according to the invention consist in that one part is a housing of the delivery device and the second part is a cover on the housing of the delivery device.
  • gear pump according to the invention consist in that a flow sensor is provided for measuring a flushing medium flow through the recess.
  • the measurement of the flushing medium flow opens up the possibility of checking the reliability of the sealing arrangement. Excessive flushing medium loss due to corrosion damage can therefore be detected by the measurement and a repair can be arranged in good time.
  • the flushing medium is an inert gas, in particular nitrogen, or an inert liquid, in particular a silicone oil.
  • gear pump according to the invention consist in that the sealing element is fixed within the recess by fixing elements.
  • gear pump according to the invention consist in that a liquid sealant is present between the sealing surfaces, the sealant being, for example, Permatex® High-Temp Red RTV Silicone Gasket (Permatex, 10 Columbus Bld, Hartford, Connecticut 06106, USA - www.permatex. com ) can be used.
  • the sealant being, for example, Permatex® High-Temp Red RTV Silicone Gasket (Permatex, 10 Columbus Bld, Hartford, Connecticut 06106, USA - www.permatex. com ) can be used.
  • the present invention relates to a method for operating a gear pump according to FIG one of the embodiment variants described above, wherein a sealing element is present which partially fills a recess, so that a cavity remains in the recess, the cavity being flushed with a flushing medium.
  • a variant of the method according to the invention consists in that a flow of the flushing medium through the cavity or a pressure of the flushing medium in the cavity is kept constant.
  • Fig. 1 a plan view of a housing 2 of a gear pump is shown, the viewing direction running parallel to shafts on which intermeshing gears are mounted.
  • the shafts and the gears are in Fig. 1 Not shown.
  • a recess 9 as part of a sealing arrangement 1 can be seen around the spectacle-shaped contour.
  • the recess 9 is guided completely around the spectacle-shaped contour and is connected to a supply channel 11 and a discharge channel 12, both of which are led through the housing 2 to the outside.
  • holes 10 can be seen, which are used for fastening a housing cover (in Fig. 1 not shown) are provided on the pump housing 2.
  • the housing cover is removed for assembly or disassembly of the gear pump.
  • the interior 7 must face the exterior 8 be as tight as possible.
  • the sealing arrangement is provided between the housing cover and the housing.
  • a sealing element is let into the recess 9 belonging to the sealing arrangement and will be explained in detail with reference to the following figures.
  • the recess 9 is - as in Fig. 1 shown - incorporated into the housing 2.
  • the recess 9 can also be incorporated into the housing cover.
  • the recess 9 is provided both in the housing 2 and in the housing cover.
  • Fig. 2 shows a section through the sealing arrangement 1 along the line in FIG Fig. 1 drawn section line AA.
  • the sealing arrangement 1 consists of a first part 2, for example a housing cover for a gear pump, and a second part 3, for example a housing for a gear pump.
  • a recess 9 is provided in the second part 3 for partially receiving a sealing element 4, which however does not completely fill the recess 9, so that a cavity 5 also remains when the first part 2 is pressed onto the second part 3.
  • the sealing element 4 must protrude beyond the sealing surface 16 for a good seal.
  • the sealing element 4 made of an elastic material is pressed together, whereby the Sealing arrangement 1 already seals the two parts 2, 3.
  • foreign matter can still reach the sealing element 4 through a sealing gap formed by the sealing surfaces 15, 16.
  • a cavity 5 is created in the recess 9, into which the feed channel 11 ( Fig. 1 ) a flushing medium is introduced which spreads in the cavity 5.
  • the flushing medium is discharged via the discharge channel 12, so that continuous renewal of the flushing medium in the cavity 5 is guaranteed.
  • An inert gas in particular nitrogen, or an inert liquid, in particular a silicone oil, is, for example, suitable as the flushing medium.
  • Fig. 3 shows a section according to Fig. 2 by a further embodiment of the present invention.
  • a fixing element 8 is provided in the recess 9, which ensures that the sealing element 4 is fixed in its position. This ensures that the cavity 5 has a desired cross-section and that the flushing medium can flow unhindered through the recess 9.
  • the fixing element 8 in any position within the Recess 9 can be arranged. It is also conceivable that several fixing elements 8 are provided so that the sealing element 4 can be held in the middle of the recess 9, for example, so that cavities 5 are created on both sides of the sealing element 4.
  • Fig. 4 shows in a section perpendicular to in Fig. 1 apparent sealing surface 15 is a detail C of the discharge channel 12 in the area of a connection point.
  • the discharge channel 12 is incorporated into the sealing surface 15.
  • the discharge channel 12 in the sealing surface 15 does not lead to the outside of the housing 2.
  • the discharge channel 12 is led to a connection point 14 through a bore 13 in the housing 2.
  • This has the advantage that the sealing surfaces 15, 16 are not passed through the connection point 14, which offers a simplified connection option for valves, connection lines and the like.
  • To connect the flushing medium source on the side of the feed channel 11 ( Fig. 1 ) is a corresponding connection point - as shown in Fig. 4 is shown for the discharge channel 12 - provided.
  • a further variant embodiment of the present invention consists in that the supply channel 11 and the discharge channel 12, as a modification of the one in FIGS Fig. 1 and 4th shown variant is not incorporated in the housing 2 but in the housing cover. It is conceivable that a hole through the housing cover directly to the recess 9 or to Cavity 5 is provided in order to supply this with flushing medium.
  • Another embodiment variant consists in that the sealing gap between the sealing surfaces 15 and 16 is designed as a liquid seal in that a liquid sealant is introduced into the sealing gap.
  • the sealant available under the trade name Permatex® High-Temp Red RTV Silicone Gasket (Permatex, 10 Columbus Bld, Hartford, Connecticut 06106, USA - www.permatex.com ) is suitable as a sealant .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Description

Die vorliegende Erfindung betrifft eine Zahnradpumpe, mit einer Dichtungsanordnun sowie ein Verfahren zum Betrieb der Zahnradpumpe.The present invention relates to a gear pump with a sealing arrangement and a method for operating the gear pump.

Viele Prozesse in der Polymer-verarbeitenden Industrie sind sehr Sauerstoff-empfindlich. Ein Sauerstoffkontakt mit Polymer ist daher möglichst zu vermeiden. In der Regel laufen Polymerisationsprozesse im Vakuum ab. Es besteht daher gerade bei diesen Prozessen die Gefahr, dass durch einen Unterdruck in den Anlagekomponenten Sauerstoff mit eingezogen wird. Insbesondere weisen Zahnradpumpen Dichtstellen auf, die besonders anfällig für eine Leckage sind.Many processes in the polymer processing industry are very sensitive to oxygen. Oxygen contact with the polymer should therefore be avoided as far as possible. As a rule, polymerization processes take place in a vacuum. With these processes in particular, there is therefore the risk that oxygen is drawn in as a result of negative pressure in the system components. In particular, gear pumps have sealing points that are particularly susceptible to leakage.

Oft werden Zahnradpumpen als Fördereinrichtungen unterhalb von Polymerisationsreaktoren eingesetzt. Diesen Zahnradpumpen fällt die Aufgabe zu, das fertige Reaktionsprodukt aus dem Reaktor auszutragen und in weiterführende Anlagekomponenten zu fördern.Gear pumps are often used as delivery devices below polymerization reactors. The task of these gear pumps is to discharge the finished reaction product from the reactor and convey it to further system components.

Zur Vermeidung von Sauerstoffkontakt mit dem Fördermedium wurde bereits vorgeschlagen, eine Ummantelung bzw. Umhausung der kritischen (allenfalls undichten) Prozess-Komponenten (z.B. der Zahnradpumpe) mit einem zusätzlichen Schutzgehäuse vorzusehen. Hierzu werden die relevanten Anlagekomponenten beispielsweise mit einem Blechmantel umfasst, wobei der Zwischenraum zwischen den Anlagenkomponenten und dem Schutzgehäuse mit Reinststickstoff geflutet wird. Dies hat aber erhebliche Nachteile in Bezug auf den Preis und auch in Bezug auf die Zugänglichkeit der Anlage.To avoid oxygen contact with the conveying medium, it has already been proposed that the critical (possibly leaky) process components (eg the gear pump) be encased or encased with an additional Provide protective housing. For this purpose, the relevant system components are encompassed, for example, with a sheet metal jacket, with the space between the system components and the protective housing being flooded with pure nitrogen. However, this has considerable disadvantages with regard to the price and also with regard to the accessibility of the system.

Ferner ist aus der Offenlegungsschrift der internationalen Patentanmeldung WO 2013/127464 eine Dichtungsanordnung für eine Zahnradpumpe bekannt. Die bekannte Lehre ist sehr effektiv und ermöglicht eine sehr gute Abdichtung, wobei allerdings zwei Nuten für die Dichtring und eine Ausnehmung zur Flutung mit einem Dichtmedium erforderlich sind. Die bekannte Dichtungsanordnung kann bei bestehenden Anlagen nicht nachgerüstet werden und eignet sich daher lediglich für neue Anlagekomponenten. Eine ähnliche Dichtungsanordnung ist im Gebrauchsmuster mit dem Offenlegungszeichen DE 20 2004 018 733 U1 offenbart, wobei diese weniger effektiv als die Lehre gemäss WO 2013/127464 ist.Furthermore, from the laid-open specification of the international patent application WO 2013/127464 a sealing arrangement for a gear pump is known. The known teaching is very effective and enables a very good seal, although two grooves for the sealing ring and a recess for flooding with a sealing medium are required. The known sealing arrangement cannot be retrofitted in existing systems and is therefore only suitable for new system components. A similar sealing arrangement is in the utility model with the disclosure mark DE 20 2004 018 733 U1 disclosed, whereby these are less effective than the teaching according to WO 2013/127464 is.

Beispielsweise werden zur Abdichtung von Dichtstellen zwischen Zahnradpumpengehäuse und Zahnradpumpendeckel gasgefüllte Metall-O-Ringe in den Deckel oder das Gehäuse eingebaut.For example, gas-filled metal O-rings are installed in the cover or the housing to seal sealing points between the gear pump housing and the gear pump cover.

Unter normalen Bedingungen dichten diese recht zuverlässig gegen Austritt von Polymer aus der unter hohem Innendruck stehenden Pumpe ab. Allerdings ist die Dichtwirkung für Gase nicht unter allen Betriebszuständen optimal.Under normal conditions these seal quite reliably against leakage of polymer from the under high internal pressure standing pump. However, the sealing effect for gases is not optimal under all operating conditions.

Der vorliegenden Erfindung lag daher die Aufgabe zugrunde, eine Zahnradpumpe mit einer Dichtungsanordnung anzugeben, die einfach und kostengünstig realisiert werden kann, wobei die Dichtungsanordnung gegebenenfalls bei bestehenden Zahnradpumpen nachgerüstet werden kann.The present invention was therefore based on the object of specifying a gear pump with a sealing arrangement that can be implemented simply and inexpensively, with the sealing arrangement optionally being able to be retrofitted to existing gear pumps.

Diese Aufgabe wird durch die im kennzeichnenden Teil von Anspruch 1 angegebenen Merkmale gelöst. Vorteilhafte weitere Ausgestaltungen der vorliegenden Erfindung sowie ein Verfahren zum Betrieb der Zahnradpumpe sind in weiteren Ansprüchen angegeben.This object is achieved by the features specified in the characterizing part of claim 1. Advantageous further embodiments of the present invention and a method for operating the gear pump are specified in further claims.

Die vorliegende Erfindung betrifft zunächst eine Zahnradpumpe mit einem Innenraum, der gegenüber einem Aussenraum mit einer Dichtungsanordnung abdichtbar ist. Die Dichtungsanordnung umfasst mindestens zwei abzudichtende Teile mit je einer Dichtfläche, wobei eine Ausnehmung in mindestens einer der Dichtflächen vorhanden ist. Die Dichtungsanordnung zeichnet sich dadurch aus, dass ein Dichtungselement vorhanden ist, das die Ausnehmung teilweise ausfüllt, so dass ein Hohlraum in der Ausnehmung bestehen bleibt, dass die Ausnehmung über einen Zuführkanal mit einer Quelle mitThe present invention relates first of all to a gear pump with an interior space which can be sealed off from an exterior space with a sealing arrangement. The sealing arrangement comprises at least two parts to be sealed, each with a sealing surface, a recess being present in at least one of the sealing surfaces. The sealing arrangement is characterized in that there is a sealing element which partially fills the recess, so that a cavity remains in the recess, that the recess with a source via a feed channel

Spülmedium verbunden ist, dass die Ausnehmung über einen Abführkanal verbunden ist und dass der Hohlraum zumindest teilweise mit Spülmedium aktiv durchspülbar ist.Rinsing medium is connected, that the recess is connected via a discharge channel and that the cavity can be actively flushed through at least partially with flushing medium.

Die Zahnradpumpe zeichnet sich dadurch aus, dass das Dichtungselement ein O-Ring oder eine Spiraldichtung ist. Weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass der Zuführkanal und der Abführkanal zumindest teilweise als Nuten in der Dichtfläche ausgebildet sind.The gear pump is characterized in that the sealing element is an O-ring or a spiral seal. Further design variants of the gear pump according to the invention consist in that the supply channel and the discharge channel are at least partially designed as grooves in the sealing surface.

Der Zuführkanal und/oder der Abführkanal können auf einfache Weise auch bei einer bestehenden Ausnehmung mit Dichtungselement nachgerüstet werden, indem die Zuführ- und Abführkanäle in eine oder beide Dichtflächen eingearbeitet werden, wozu sich beispielsweise ein Flex vorzüglich eignet.The feed channel and / or the discharge channel can easily be retrofitted to an existing recess with a sealing element by incorporating the feed and discharge channels into one or both sealing surfaces, for which a flex, for example, is ideally suited.

Weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass der Zuführkanal und/oder der Abführkanal zumindest abschnittsweise durch mindestens ein abzudichtendes Teil zu einer äusseren Anschlussstelle führt, die nicht in den Dichtflächen liegt.Further design variants of the gear pump according to the invention consist in that the supply channel and / or the discharge channel lead at least in sections through at least one part to be sealed to an external connection point that is not in the sealing surfaces.

Damit wird eine stabile Anschlussstelle geschaffen, die auch bei einer Demontage der Dichtungsanordnung bestehen bleiben kann.This creates a stable connection point that can remain in place even when the sealing arrangement is dismantled.

Noch weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass der Abführkanal am äusseren Ende mit einem Drosselventil verbunden ist.Still further design variants of the gear pump according to the invention consist in that the discharge channel is connected to a throttle valve at the outer end.

Bei dieser Ausführungsvariante der Hohlraum mit Spülmedium gespült, das danach über das Drosselventil einfach in die Umgebung abgeblasen wird.In this variant, the cavity is flushed with flushing medium, which is then simply blown off into the environment via the throttle valve.

Noch weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass die Quelle, der Zuführkanal, die Ausnehmung bzw. zumindest ein Hohlraum in der Ausnehmung und der Abführkanal einen geschlossenen Spülmediumkreislauf bilden.Still further design variants of the gear pump according to the invention consist in that the source, the supply channel, the recess or at least one cavity in the recess and the discharge channel form a closed flushing medium circuit.

Noch weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass der eine Teil ein Gehäuse der Fördereinrichtung und der zweite Teil ein Deckel auf dem Gehäuse der Fördereinrichtung ist.Still further design variants of the gear pump according to the invention consist in that one part is a housing of the delivery device and the second part is a cover on the housing of the delivery device.

Noch weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass ein Durchflussensor zur Messung eines Spülmediumflusses durch die Ausnehmung vorgesehen ist.Still further design variants of the gear pump according to the invention consist in that a flow sensor is provided for measuring a flushing medium flow through the recess.

Die Messung des Spülmediumflusses eröffnet die Möglichkeit, die Dichtungsanordnung in Bezug auf ihre Zuverlässigkeit zu überprüfen. Mithin kann übermässiger Spülmediumverlust aufgrund von Korrosionsschäden durch die Messung detektiert werden und es kann rechtzeitig eine Reparatur angeordnet werden.The measurement of the flushing medium flow opens up the possibility of checking the reliability of the sealing arrangement. Excessive flushing medium loss due to corrosion damage can therefore be detected by the measurement and a repair can be arranged in good time.

Weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass das Spülmedium ein inertes Gas, insbesondere Stickstoff, oder eine inerte Flüssigkeit, insbesondere ein Silikon-Öl, ist.Further design variants of the gear pump according to the invention consist in that the flushing medium is an inert gas, in particular nitrogen, or an inert liquid, in particular a silicone oil.

Noch weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass das Dichtelement durch Fixierelemente innerhalb der Ausnehmung fixiert ist.Still further design variants of the gear pump according to the invention consist in that the sealing element is fixed within the recess by fixing elements.

Damit ist sichergestellt, dass der Hohlraum vollständig mit Spülmedium durchströmt wird.This ensures that the flushing medium flows completely through the cavity.

Noch weitere Ausführungsvarianten der erfindungsgemässen Zahnradpumpe bestehen darin, dass zwischen den Dichtflächen ein flüssiges Dichtmittel vorhanden ist, wobei als Dichtmittel beispielsweise Permatex® High-Temp Red RTV Silicone Gasket (Permatex, 10 Columbus Bld, Hartford, Connecticut 06106, USA - www.permatex.com) verwendbar ist.Still further design variants of the gear pump according to the invention consist in that a liquid sealant is present between the sealing surfaces, the sealant being, for example, Permatex® High-Temp Red RTV Silicone Gasket (Permatex, 10 Columbus Bld, Hartford, Connecticut 06106, USA - www.permatex. com ) can be used.

Schliesslich ist die vorliegende Erfindung auf ein Verfahren zum Betreiben einer Zahnradpumpe gemäss einer der vorstehend beschriebenen Ausführungsvarianten gerichtet, wobei ein Dichtungselement vorhanden ist, das eine Ausnehmung teilweise ausfüllt, so dass ein Hohlraum in der Ausnehmung bestehen bleibt, wobei der Hohlraum mit einem Spülmedium durchspült wird.Finally, the present invention relates to a method for operating a gear pump according to FIG one of the embodiment variants described above, wherein a sealing element is present which partially fills a recess, so that a cavity remains in the recess, the cavity being flushed with a flushing medium.

Eine Ausführungsvariante des erfindungsgemässen Verfahrens besteht darin, dass ein Durchfluss des Spülmediums durch den Hohlraum oder ein Druck des Spülmediums im Hohlraum konstant gehalten wird.A variant of the method according to the invention consists in that a flow of the flushing medium through the cavity or a pressure of the flushing medium in the cavity is kept constant.

Weitere Ausführungsvarianten des erfindungsgemässen Verfahrens bestehen darin, dass ein Durchfluss des Spülmediums durch den Hohlraum gemessen wird.Further variants of the method according to the invention consist in measuring a flow of the flushing medium through the cavity.

Es wird ausdrücklich darauf hingewiesen, dass die vorstehend erläuterten Ausführungsvarianten in beliebiger Weise kombiniert werden können. Lediglich diejenigen Ausführungsvarianten sind ausgeschlossen, die - bei Kombination - zu einem Widerspruch führen würden.It is expressly pointed out that the design variants explained above can be combined in any way. Only those design variants are excluded which - if combined - would lead to a contradiction.

Im Folgenden wird die vorliegende Erfindung anhand von in Zeichnungen dargestellten Ausführungsbeispielen weiter erläutert. Es zeigen:

Fig. 1
eine Draufsicht auf ein Gehäuse einer Zahnradpumpe ohne Deckel und ohne Zahnräder mit dazugehörenden Wellen und,
Fig. 2
einen Querschnitt durch eine erste Ausführungsvariante einer erfindungsgemässen Dichtungsanordnung,
Fig. 3
einen Querschnitt durch eine zweiten Ausführungsvariante einer erfindungsgemässen Dichtungsanordnung und
Fig. 4
einen Querschnitt durch eine Anschlussstelle, die zu Dichtungsflächen beabstandet angeordnet ist.
In the following, the present invention is explained further with reference to exemplary embodiments shown in the drawings. Show it:
Fig. 1
a plan view of a housing of a gear pump without cover and without gears with associated shafts and,
Fig. 2
a cross section through a first embodiment of a sealing arrangement according to the invention,
Fig. 3
a cross section through a second variant embodiment of a sealing arrangement according to the invention and
Fig. 4
a cross section through a connection point which is arranged at a distance from sealing surfaces.

In Fig. 1 ist eine Draufsicht auf ein Gehäuse 2 einer Zahnradpumpe dargestellt, wobei die Blickrichtung parallel zu Wellen verläuft, auf denen ineinander greifende Zahnräder montiert sind. Die Wellen und die Zahnräder sind in Fig. 1 nicht gezeigt. Da ein das Pumpengehäuse abschliessender Deckel nicht vorhanden ist, ist der Blick frei in den Innenraum 7 mit Brillen-förmigem Querschnitt. Um die Brillen-förmige Kontur ist eine Ausnehmung 9 als Teil einer Dichtungsanordnung 1 ersichtlich. Die Ausnehmung 9 ist vollständig um die Brillen-förmige Kontur herumgeführt und ist mit einem Zuführkanal 11 und einem Abführkanal 12 verbunden, die beide durch das Gehäuse 2 nach aussen geführt sind. Ferner sind Bohrungen 10 ersichtlich, die zur Befestigung eines Gehäusedeckels (in Fig. 1 nicht dargestellt) auf dem Pumpengehäuse 2 vorgesehen sind. Der Gehäusedeckel wird zur Montage bzw. Demontage der Zahnradpumpe entfernt. Im normalen Betrieb der Zahnradpumpe muss der Innenraum 7 zum Aussenraum 8 möglichst dicht sein. Hierzu ist die Dichtungsanordnung zwischen Gehäusedeckel und Gehäuse vorgesehen.In Fig. 1 a plan view of a housing 2 of a gear pump is shown, the viewing direction running parallel to shafts on which intermeshing gears are mounted. The shafts and the gears are in Fig. 1 Not shown. Since there is no cover closing off the pump housing, there is a clear view into the interior 7 with a spectacle-shaped cross section. A recess 9 as part of a sealing arrangement 1 can be seen around the spectacle-shaped contour. The recess 9 is guided completely around the spectacle-shaped contour and is connected to a supply channel 11 and a discharge channel 12, both of which are led through the housing 2 to the outside. Furthermore, holes 10 can be seen, which are used for fastening a housing cover (in Fig. 1 not shown) are provided on the pump housing 2. The housing cover is removed for assembly or disassembly of the gear pump. During normal operation of the gear pump, the interior 7 must face the exterior 8 be as tight as possible. For this purpose, the sealing arrangement is provided between the housing cover and the housing.

In die zur Dichtungsanordnung gehörenden Ausnehmung 9 ist ein Dichtungselement eingelassen, das anhand der folgenden Figuren im Detail noch erläutert wird.A sealing element is let into the recess 9 belonging to the sealing arrangement and will be explained in detail with reference to the following figures.

Die Ausnehmung 9 ist - wie in Fig. 1 dargestellt - in das Gehäuse 2 eingearbeitet. Alternativ kann die Ausnehmung 9 auch in den Gehäusedeckel eingearbeitet sein. Schliesslich ist es auch denkbar, dass die Ausnehmung 9 sowohl im Gehäuse 2 als auch im Gehäusedeckel vorgesehen ist.The recess 9 is - as in Fig. 1 shown - incorporated into the housing 2. Alternatively, the recess 9 can also be incorporated into the housing cover. Finally, it is also conceivable that the recess 9 is provided both in the housing 2 and in the housing cover.

Fig. 2 zeigt einen Schnitt durch die Dichtungsanordnung 1 entlang der in Fig. 1 eingezeichneten Schnittlinie A-A. Die Dichtungsanordnung 1 besteht aus einem ersten Teil 2, beispielsweise einem Gehäusedeckel für eine Zahnradpumpe, und einem zweiten Teil 3, beispielsweise einem Gehäuse einer Zahnradpumpe. In den zweiten Teil 3 ist eine Ausnehmung 9 zur teilweisen Aufnahme eines Dichtungselementes 4 vorgesehen, das die Ausnehmung 9 jedoch nicht vollständig ausfüllt, so dass ein Hohlraum 5 auch dann übrig bleibt, wenn der erste Teil 2 auf den zweiten Teil 3 gepresst wird. Zudem muss vor dem Zusammenpressen der beiden Teile 2. und 3 das Dichtungselement 4 für eine gute Abdichtung über die Dichtungsfläche 16 hinausragen. Durch das Zusammenpressen des ersten und des zweiten Teils 2, 3 bzw. deren Dichtflächen 15, 16 wird das aus einem elastischen Material bestehende Dichtungselement 4 zusammengedrückt, womit die Dichtungsanordnung 1 die beiden Teile 2, 3 bereits abdichtet. Allerdings können nach wie vor Fremdstoffe durch einen durch die Dichtflächen 15, 16 gebildeten Dichtspalt zum Dichtungselement 4 gelangen. Je nach Fremdstoff kann es daher im Bereich der Ausnehmung 9 zu Korrosion führen, die im schlimmsten Fall zu einer Unterwanderung des Dichtungselementes 4 führen, womit die Dichtanordnung undicht werden kann. Erfindungsgemäss wird daher in der Ausnehmung 9 ein Hohlraum 5 geschaffen, in den über den Zuführkanal 11 (Fig. 1) ein Spülmedium eingeleitet wird, das sich im Hohlraum 5 ausbreitet. Das Spülmedium wird über den Abführkanal 12 abgeleitet, so dass eine laufende Erneuerung von Spülmedium im Hohlraum 5 gewährleitet ist. Fig. 2 shows a section through the sealing arrangement 1 along the line in FIG Fig. 1 drawn section line AA. The sealing arrangement 1 consists of a first part 2, for example a housing cover for a gear pump, and a second part 3, for example a housing for a gear pump. A recess 9 is provided in the second part 3 for partially receiving a sealing element 4, which however does not completely fill the recess 9, so that a cavity 5 also remains when the first part 2 is pressed onto the second part 3. In addition, before the two parts 2 and 3 are pressed together, the sealing element 4 must protrude beyond the sealing surface 16 for a good seal. By pressing the first and second parts 2, 3 or their sealing surfaces 15, 16 together, the sealing element 4 made of an elastic material is pressed together, whereby the Sealing arrangement 1 already seals the two parts 2, 3. However, foreign matter can still reach the sealing element 4 through a sealing gap formed by the sealing surfaces 15, 16. Depending on the foreign matter, it can therefore lead to corrosion in the area of the recess 9, which in the worst case can lead to infiltration of the sealing element 4, which can cause the sealing arrangement to leak. According to the invention, therefore, a cavity 5 is created in the recess 9, into which the feed channel 11 ( Fig. 1 ) a flushing medium is introduced which spreads in the cavity 5. The flushing medium is discharged via the discharge channel 12, so that continuous renewal of the flushing medium in the cavity 5 is guaranteed.

Als Spülmedium eignet sich beispielsweise ein inertes Gas, insbesondere Stickstoff, oder eine inerte Flüssigkeit, insbesondere ein Silikon-Öl.An inert gas, in particular nitrogen, or an inert liquid, in particular a silicone oil, is, for example, suitable as the flushing medium.

Fig. 3 zeigt einen Schnitt gemäss Fig. 2 durch eine weitere Ausführungsvariante der vorliegenden Erfindung. Im Unterschied zur Ausführungsvariante gemäss Fig. 2 ist bei der Ausführungsvariante gemäss Fig. 3 in der Ausnehmung 9 ein Fixierelement 8 vorgesehen, das gewährleistet, dass das Dichtungselement 4 in seiner Position fixiert ist. Damit ist gewährleistet, dass der Hohlraum 5 einen angestrebten Querschnitt aufweist und dass das Spülmedium ungehindert durch die Ausnehmung 9 strömen kann. Fig. 3 shows a section according to Fig. 2 by a further embodiment of the present invention. In contrast to the variant according to Fig. 2 is for the variant according to Fig. 3 A fixing element 8 is provided in the recess 9, which ensures that the sealing element 4 is fixed in its position. This ensures that the cavity 5 has a desired cross-section and that the flushing medium can flow unhindered through the recess 9.

Es wird ausdrücklich darauf hingewiesen, dass das Fixierelement 8 in einer beliebigen Position innerhalb der Ausnehmung 9 angeordnet sein kann. Denkbar ist auch, dass mehrere Fixierelemente 8 vorgesehen sind, so dass das Dichtungselement 4 beispielsweise mittig in der Ausnehmung 9 gehalten werden kann, womit beidseits des Dichtungselementes 4 Hohlräume 5 entstehen.It is expressly pointed out that the fixing element 8 in any position within the Recess 9 can be arranged. It is also conceivable that several fixing elements 8 are provided so that the sealing element 4 can be held in the middle of the recess 9, for example, so that cavities 5 are created on both sides of the sealing element 4.

Fig. 4 zeigt in einem Schnitt senkrecht zur in Fig. 1 ersichtlichen Dichtungsfläche 15 ein Detail C des Abführkanals 12 im Bereich einer Anschlussstelle. Wie schon aus Fig. 1 ersichtlich ist, ist der Abführkanal 12 in die Dichtfläche 15 eingearbeitet. Bei der dargestellten Ausführungsvariante ist der Abführkanal 12 jedoch in der Dichtfläche 15 nicht bis zur Aussenseite des Gehäuses 2 führt. Der Abführkanal 12 wird durch eine Bohrung 13 im Gehäuse 2 zu einer Anschlussstelle 14 geführt. Dies hat den Vorteil, dass die Dichtflächen 15, 16 nicht durch die Anschlussstelle 14 hindurchgeführt ist, womit eine vereinfachte Anschlussmöglichkeit für Ventile, Anschlussleitungen und dergleichen angeboten wird. Zum Anschliessen der Spülmediums-Quelle auf der Seite des Zuführkanals 11 (Fig. 1) ist eine entsprechende Anschlussstelle - wie sie in Fig. 4 für den Abführkanal 12 gezeigt ist - vorgesehen. Fig. 4 shows in a section perpendicular to in Fig. 1 apparent sealing surface 15 is a detail C of the discharge channel 12 in the area of a connection point. Like already from Fig. 1 As can be seen, the discharge channel 12 is incorporated into the sealing surface 15. In the embodiment variant shown, however, the discharge channel 12 in the sealing surface 15 does not lead to the outside of the housing 2. The discharge channel 12 is led to a connection point 14 through a bore 13 in the housing 2. This has the advantage that the sealing surfaces 15, 16 are not passed through the connection point 14, which offers a simplified connection option for valves, connection lines and the like. To connect the flushing medium source on the side of the feed channel 11 ( Fig. 1 ) is a corresponding connection point - as shown in Fig. 4 is shown for the discharge channel 12 - provided.

Eine weitere Ausführungsvariante der vorliegenden Erfindung besteht darin, dass der Zuführkanal 11 und der Abführkanal 12 in Abwandlung zu der in den Fig. 1 und 4 gezeigten Variante nicht im Gehäuse 2 sondern in den Gehäusedeckel eingearbeitet ist. Denkbar ist dabei, dass eine Bohrung durch den Gehäusedeckel direkt zur Ausnehmung 9 bzw. zur Hohlraum 5 vorgesehen ist, um diesen mit Spülmedium zu versorgen.A further variant embodiment of the present invention consists in that the supply channel 11 and the discharge channel 12, as a modification of the one in FIGS Fig. 1 and 4th shown variant is not incorporated in the housing 2 but in the housing cover. It is conceivable that a hole through the housing cover directly to the recess 9 or to Cavity 5 is provided in order to supply this with flushing medium.

Eine weitere Ausführungsvariante besteht darin, dass der Dichtspalt zwischen den Dichtflächen 15 und 16 als Flüssigdichtung ausgestaltet ist, indem ein flüssiges Dichtmittel in den Dichtspalt eingebracht wird. Gleiches gilt auch für alle Anschlussstellen, etc. Als Dichtmittel eignet sich dabei beispielsweise das unter dem Handelsnamen Permatex® High-Temp Red RTV Silicone Gasket (Permatex, 10 Columbus Bld, Hartford, Connecticut 06106, USA - www.permatex.com) erhältliche Dichtmittel.Another embodiment variant consists in that the sealing gap between the sealing surfaces 15 and 16 is designed as a liquid seal in that a liquid sealant is introduced into the sealing gap. The same applies to all connection points, etc. The sealant available under the trade name Permatex® High-Temp Red RTV Silicone Gasket (Permatex, 10 Columbus Bld, Hartford, Connecticut 06106, USA - www.permatex.com ) is suitable as a sealant .

Claims (13)

  1. Gear pump with an interior space (7) that can be sealed off from an outside space (6) with a sealing arrangement (1), the sealing arrangement comprising at least two parts (2, 3) to be sealed, each with a sealing surface (15, 16), the two parts (2, 3) being fixed at each other such that they are pressed against each other, and wherein there is a recess (9) in at least one of the sealing surfaces (15, 16), characterized in that a sealing element (4) designed as an O-ring or as a spiral sealing is provided which partially fills the recess (9) so that a cavity (5) in the recess (9) remains, that the recess (9) is connected to a source of flushing medium via a feed channel (11), that the recess (9) is connected via a discharge channel (12) and that the cavity (5) is at least partially flushable with flushing medium.
  2. Gear pump according to claim 1, characterized in that the feed channel (11) and the discharge channel (12) are at least partially formed as grooves in the sealing surfaces (15, 16).
  3. Gear pump according to one of the claims 1 to 2, characterized in that the feed channel (11) and/or the discharge channel (12) leads at least in sections through at least one part to be sealed (2, 3) to an outer connection point (14), which is not in the sealing surfaces (15, 16).
  4. Gear pump according to one of claims 1 to 3, characterized in that the discharge channel (12) is connected at the outer end to a throttle valve.
  5. Gear pump according to one of claims 1 to 3, characterized in that the source, the feed channel (11), the recess (9) or at least one cavity (5) in the recess (9), respectively, and the discharge channel (12) form a closed flushing medium circuit.
  6. Gear pump according to one of claims 1 to 5, characterized in that one part (2) is a housing of the conveyor and the second part (3) is a cover on the housing of the conveyor.
  7. Gear pump according to one of claims 1 to 6, characterized in that a flow sensor for measuring a flow of flushing medium through the recess (9) is provided.
  8. Gear pump according to one of claims 1 to 7, characterized in that the flushing medium is an inert gas, in particular nitrogen, or an inert liquid, in particular a silicone oil.
  9. Gear pump according to one of claims 1 to 8, characterized in that the sealing element (4) is fixed by fixing elements (8) within the recess (9).
  10. Gear pump according to one of claims 1 to 9, characterized in that a liquid sealant is present between the sealing surfaces (15, 16).
  11. Method for operating a sealing arrangement (1) according to one of claims 1 to 10, wherein a sealing element (4) is provided which partially fills a recess (9) so that a cavity (5) remains in the recess (9), characterized in that the cavity (5) is flushed with a flushing medium.
  12. Method according to claim 11, characterized in that a flow of the flushing medium through the cavity (5) or a pressure of the flushing medium in the cavity (5) is kept constant.
  13. Method according to claim 11 or 12, characterized in that a flow of the flushing medium through the cavity (5) is measured.
EP13191707.2A 2013-11-06 2013-11-06 Gear pump with a sealing assembly Active EP2871363B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13191707.2A EP2871363B1 (en) 2013-11-06 2013-11-06 Gear pump with a sealing assembly
CN201410558029.1A CN104632614B (en) 2013-11-06 2014-10-20 The operating method of sealing structure, the conveying device with sealing structure and sealing structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13191707.2A EP2871363B1 (en) 2013-11-06 2013-11-06 Gear pump with a sealing assembly

Publications (2)

Publication Number Publication Date
EP2871363A1 EP2871363A1 (en) 2015-05-13
EP2871363B1 true EP2871363B1 (en) 2020-10-07

Family

ID=49546301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13191707.2A Active EP2871363B1 (en) 2013-11-06 2013-11-06 Gear pump with a sealing assembly

Country Status (2)

Country Link
EP (1) EP2871363B1 (en)
CN (1) CN104632614B (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700381A1 (en) * 1977-01-07 1978-07-13 Bosch Gmbh Robert DISPLACEMENT MACHINE
DE3116283A1 (en) * 1981-04-24 1982-11-11 Lederle GmbH Pumpen- und Maschinenfabrik, 7803 Gundelfingen Rotary piston pump with a face seal
US4993720A (en) * 1988-08-15 1991-02-19 Ciotola Alfredo A Self-sealing mechanical seal gland for pumps and other machinery
GB2408801A (en) * 2003-12-03 2005-06-08 Boc Group Plc Detection of seal leak using differential pressure measurement
DE102006015602A1 (en) * 2006-04-04 2007-10-11 Hydac System Gmbh Device for conveying fluid media, in particular lubricants
CN202091196U (en) * 2011-05-24 2011-12-28 博顿液压股份有限公司 Sealing element for gear pump or motor
EP2820247B1 (en) 2012-03-02 2021-02-17 Maag Pump Systems AG Sealing arrangement, a conveying device having a sealing arrangement and a method for operating the sealing arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2871363A1 (en) 2015-05-13
CN104632614A (en) 2015-05-20
CN104632614B (en) 2018-09-14

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