EP2871363B1 - Pompe à engrenages avec un ensemble d'étanchéité - Google Patents

Pompe à engrenages avec un ensemble d'étanchéité 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
Authority
EP
European Patent Office
Prior art keywords
recess
gear pump
sealing
cavity
flushing medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13191707.2A
Other languages
German (de)
English (en)
Other versions
EP2871363A1 (fr
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
Original Assignee
Maag Pump Systems AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maag Pump Systems AG filed Critical Maag Pump Systems AG
Priority to EP13191707.2A priority Critical patent/EP2871363B1/fr
Priority to CN201410558029.1A priority patent/CN104632614B/zh
Publication of EP2871363A1 publication Critical patent/EP2871363A1/fr
Application granted granted Critical
Publication of EP2871363B1 publication Critical patent/EP2871363B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • 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 .

Landscapes

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

Claims (13)

  1. Pompe à engrenages comprenant un espace intérieur (7) pouvant être rendu étanche par rapport à un espace extérieur (6) par le biais d'un dispositif d'étanchéité (1), le dispositif d'étanchéité (1) comprenant au moins deux parties à étanchéifier (2, 3) avec chacune une surface d'étanchéité (15, 16), les deux parties (2, 3) étant fixées l'une à l'autre, de sorte qu'elles sont appuyées l'une contre l'autre, et un évidement (9) étant agencé dans au moins une des surfaces d'étanchéité (15, 16), caractérisée en ce qu'il est installé un élément d'étanchéité (4) réalisé sous la forme d'un joint torique ou d'un joint d'étanchéité en spirale qui vient remplir au moins partiellement l'évidement (9) de façon à ce qu'il reste un espace vide (5) dans l'évidement (9), en ce que l'évidement (9) est raccordé à une source de fluide de rinçage par le biais d'un canal d'alimentation (11), en ce que l'évidement (9) est raccordé à un canal d'évacuation (12) et en ce que l'espace vide (5) peut être rincé activement au moins partiellement avec du fluide de rinçage.
  2. Pompe à engrenages selon la revendication 1, caractérisée en ce que le canal d'alimentation (11) et le canal d'évacuation (12) sont réalisés au moins partiellement sous la forme de rainures dans la surface d'étanchéité (15, 16).
  3. Pompe à engrenages selon l'une des revendications 1 à 2, caractérisée en ce que le canal d'alimentation (11) et/ou le canal d'évacuation (12) conduit au moins par endroits par au moins une partie à étanchéifier (2, 3) à un point de raccordement extérieur (14) qui ne se trouve pas dans les surfaces d'étanchéité (15, 16).
  4. Pompe à engrenages selon l'une des revendications 1 à 3, caractérisée en ce que le canal d'évacuation (12) est raccordé au niveau de l'extrémité extérieure à une vanne papillon.
  5. Pompe à engrenages selon l'une des revendications 1 à 3, caractérisée en ce que la source, le canal d'alimentation (11), l'évidement (9) et au moins un espace vide (5) dans l'évidement (9), et le canal d'évacuation (12) forment un circuit de fluide de rinçage fermé.
  6. Pompe à engrenages selon l'une des revendications 1 à 5, caractérisée en ce que la première partie (2) est le boîtier du système de transport et la deuxième partie (3) le couvercle sur le boîtier du système de transport.
  7. Pompe à engrenages selon l'une des revendications 1 à 6, caractérisée en ce qu'il est prévu un débitmètre pour mesurer le débit du fluide de rinçage à travers l'évidement (9).
  8. Pompe à engrenages selon l'une des revendications 1 à 7, caractérisée en ce que le fluide de rinçage est un gaz inerte, en particulier de l'azote, ou bien un liquide inerte, en particulier une huile de silicone.
  9. Pompe à engrenages selon l'une des revendications 1 à 8, caractérisée en ce que l'élément d'étanchéité (4) est fixé par des éléments de fixation (8) à l'intérieur de l'évidement (9).
  10. Pompe à engrenages selon l'une des revendications 1 à 9, caractérisée en ce qu'il est installé entre les surfaces d'étanchéité (15, 16) un moyen d'étanchéité liquide.
  11. Procédé pour faire fonctionner une pompe à engrenages selon l'une des revendications 1 à 10, dans lequel il est installé un élément d'étanchéité (4) qui vient remplir partiellement un évidement (9) de sorte qu'il reste un espace vide (5) dans l'évidement (9), caractérisé en ce que l'espace vide (5) est rincé avec un fluide de rinçage.
  12. Procédé selon la revendication 11, caractérisé en ce que le débit du fluide de rinçage à travers l'espace vide (5) ou la pression du fluide de rinçage dans l'espace vide (5) est maintenu(e) constant(e).
  13. Procédé selon la revendication 11 ou 12, caractérisé en ce que l'on mesure le débit du fluide de rinçage à travers l'espace vide (5).
EP13191707.2A 2013-11-06 2013-11-06 Pompe à engrenages avec un ensemble d'étanchéité Active EP2871363B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13191707.2A EP2871363B1 (fr) 2013-11-06 2013-11-06 Pompe à engrenages avec un ensemble d'étanchéité
CN201410558029.1A CN104632614B (zh) 2013-11-06 2014-10-20 密封结构、带密封结构的输送装置及密封结构的操作方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13191707.2A EP2871363B1 (fr) 2013-11-06 2013-11-06 Pompe à engrenages avec un ensemble d'étanchéité

Publications (2)

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

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ID=49546301

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Application Number Title Priority Date Filing Date
EP13191707.2A Active EP2871363B1 (fr) 2013-11-06 2013-11-06 Pompe à engrenages avec un ensemble d'étanchéité

Country Status (2)

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EP (1) EP2871363B1 (fr)
CN (1) CN104632614B (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700381A1 (de) * 1977-01-07 1978-07-13 Bosch Gmbh Robert Verdraengermaschine
DE3116283A1 (de) * 1981-04-24 1982-11-11 Lederle GmbH Pumpen- und Maschinenfabrik, 7803 Gundelfingen "kreiskolbenpumpe mit einer gleitringdichtung"
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 (de) * 2006-04-04 2007-10-11 Hydac System Gmbh Einrichtung zum Fördern strömungsfähiger Medien, insbesondere von Schmierstoffen
CN202091196U (zh) * 2011-05-24 2011-12-28 博顿液压股份有限公司 齿轮泵及马达的密封件
EP2820247B1 (fr) 2012-03-02 2021-02-17 Maag Pump Systems AG Système d'étanchéité, dispositif de transport pourvu d'un système d'étanchéité ainsi que procédé permettant de faire fonctionner ledit système d'étanchéité

Non-Patent Citations (1)

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

Also Published As

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

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