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WO2000063595A2 - Dispositif pour rendre etanche une fente annulaire - Google Patents

Dispositif pour rendre etanche une fente annulaire Download PDF

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Publication number
WO2000063595A2
WO2000063595A2 PCT/EP2000/003559 EP0003559W WO0063595A2 WO 2000063595 A2 WO2000063595 A2 WO 2000063595A2 EP 0003559 W EP0003559 W EP 0003559W WO 0063595 A2 WO0063595 A2 WO 0063595A2
Authority
WO
WIPO (PCT)
Prior art keywords
annular gap
pole piece
magnetic
tube
end faces
Prior art date
Application number
PCT/EP2000/003559
Other languages
German (de)
English (en)
Other versions
WO2000063595A3 (fr
Inventor
Peter NÜSSER
Johannes Müller
Norbert Buske
Werner Neumann
Original Assignee
Berlin Heart 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 Berlin Heart Ag filed Critical Berlin Heart Ag
Priority to AU47494/00A priority Critical patent/AU4749400A/en
Publication of WO2000063595A2 publication Critical patent/WO2000063595A2/fr
Publication of WO2000063595A3 publication Critical patent/WO2000063595A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force

Definitions

  • the invention relates to a device for sealing an annular gap according to the preamble of claim 1.
  • Magnetic liquids are stable dispersions with superparamagnetic properties.
  • the dispersions generally consist of the magnetic component, amphiphilic additives and a carrier liquid. Ferromagnetic or ferromagnetic particles are used as magnetic components, the particle size of which is between 3 and 50 nm.
  • the so-called amphiphilic additives give the particles either hydrophilic or hydrophobic properties and can thus be homogeneously dispersed either in aqueous or organic carrier liquids.
  • the composition of the magnetic fluid depends on its application, which determines the desired saturation magnetization, the viscosity and the chemical composition. The saturation magnetization determines the interaction of the magnetic fluid in the magnetic field. The stronger the Magnetization is, the larger pressure differences the gasket can withstand.
  • the carrier liquid When used as a sealant, the carrier liquid consists of high-boiling liquids in order to avoid evaporation of the carrier liquid.
  • amphiphilic additives depends both on the magnetic component used and on the carrier liquid.
  • the type of surfactants determines both their fixability on the particle surface of the magnetic component and the dispersibility of the particles in the respective carrier liquid.
  • radial magnetic fluid seals are proposed, for example, for rotary unions.
  • the magnetic fluid is introduced into the space between a shaft and a housing and fixed by means of a magnetic field.
  • This magnetic field is generally generated by a permanent magnet that holds the magnetic fluid in the rotating union.
  • Corresponding rotary unions have proven themselves for sealing against a negative pressure or an excess pressure. These magnetic fluid seals are characterized by low friction, very good tightness and the avoidance of any abrasion.
  • SU patent no. 675248 describes an axial seal based on magnetic liquids.
  • a seal between a shaft and a housing is achieved by axially arranging the magnetic fluid.
  • a magnet between the poles of which a magnetic fluid is arranged, is guided in a ring around the shaft.
  • This seal also serves primarily to seal against gaseous or vaporous media.
  • the invention has for its object to provide a device for sealing an annular gap by means of a magnetic liquid, which makes it possible to seal two contact-free, axially abutting pipe ends so that there is no exchange between the fluid medium in the pipes and the environment, the magnetic liquid is not with mixed with the fluid medium and the tubes can be moved and rotated with little friction.
  • the object is achieved in that the tube ends forming an annular gap are connected in a magnetically conductive manner to the poles of a magnet arrangement fixed around the annular gap region and a magnetic fluid is arranged in the annular gap.
  • the invention has several advantages. It is thus possible to seal two non-contact, axially abutting pipe ends and to guarantee that the two pipe ends can move with respect to one another without this causing sealing problems. In the case of a circular cross-sectional area of the pipe ends, it is even possible to carry out axial rotational movements of the two pipe ends against one another. Here, too, there are no sealing problems. No abrasion is observed due to the liquid sealant.
  • Carrier liquids can be equipped.
  • the range of liquids that can be used ranges from
  • Character of the fluid medium to be transported through the pipelines are adapted, that is, if aqueous media flow past the sealing device, it is expedient to use a
  • the seal according to the invention has proven to be extremely low-friction, so that the energy expenditure for generating an axial rotation can be greatly minimized and the medium to be conveyed does not heat up.
  • Another advantage of the invention is that tubes or tube ends that do not have a circular cross section can also be axially sealed to one another. This applies to both oval cross-sections and polygonal cross-sections. It is only necessary that, according to the invention, a symmetrical magnetic field is generated by a magnet arrangement, which generates a magnetic north and a magnetic south pole at one end of the tube, and thus the magnetic fluid is fixed in the annular gap. The surface quality, such as roughness of the end faces of the pipe ends, is largely insignificant. Advantageous embodiments of the invention are given in claims 2 to 20.
  • the arrangement of a peripheral barrier according to claims 6 and 7 allows the formation of a north and south pole by the contact-free contact of the magnetic part of the two-part pole shoe between the barrier and the magnetic part. This advantageously leads to a compensation of the magnetic attraction between the pipe ends.
  • the configurations according to claims 8 and 9 relate to the formation of the magnets of the magnet arrangement. Allow to use ring magnets to separate the annular gap from the surroundings if the external conditions make this necessary. In contrast, the arrangement of at least two individual magnets advantageously allows a direct observation of the partially freely visible annular gap.
  • the development according to claim 10 shows the possibility, on the one hand, of placing the pole pieces on the pipe end and, on the other hand, of directly shaping the pipe end.
  • the former case essentially assumes that pipes made of non-magnetizable material are present, while the second specified embodiment can be used in particular for pipes made of magnetizable materials.
  • the design of the end faces of the pipe ends, between which the magnetic fluid is arranged, is essential for the functionality of the device according to the invention.
  • the end faces form the pipe-side boundary of the annular gap.
  • the embodiment according to claim 19 shows the
  • the development according to claim 21 relates to the arrangement and attachment of individual and / or ring magnets directly on the pipe ends. For certain applications, it is advantageously possible to minimize the size of the device according to the invention by omitting or partially omitting pole shoes.
  • 3a is an axial view of the device with a ring magnet
  • 3b is an axial view of the device with two individual magnets
  • 4 is a sectional view of the device on a funnel-shaped tube extension
  • 5 is a sectional view of the device with a barrier to reduce attraction
  • FIG. 6a exemplary representations of the training up to the end faces
  • Fig. 6g exemplary representations of the training up to the end faces
  • Fig. 8 is a sectional view with an asymmetrically attached magnet.
  • FIGS. 2 to 8 show a sectional view of an exemplary arrangement of the device according to the invention, here and in FIGS. 2 to 8 for a clear representation the exemplary embodiments of the invention on tube walls 4a and 5a of tubes 4 and 5 in the region of tube ends 9 and 10 are shown are.
  • the tube ends 9 and 10 are so far approached that an annular gap 1 defined by end faces 14 and 15 is formed.
  • the magnet arrangement 8 contains a magnet 6, which is positioned around the annular gap 1 in a ring-shaped or ring-shaped manner and so-called pole shoes 2 and 3, which serve to transmit the magnetic flux and the optimal orientation of the magnetic field in the annular gap 1.
  • the pole piece 3 is connected to the tube wall 5a.
  • the pole piece 2 forms a secondary gap 7 with the tube wall 4a.
  • the magnet 6 is removed from the pole piece 3 above the annular gap 1 supported.
  • the tube ends 9 and 10 are connected to the magnet 6 in a magnetically conductive manner via the pole shoes 2 and 3.
  • the size of the secondary gap 7 formed between the pole piece 2 of the magnet arrangement 8 and the tube wall 4a is such that a transmission of the magnetic field from the magnet 6 via the pole piece 2 to the tube end 9 is possible.
  • the side gap 7 allows for a flexible coupling of the two pipes 4 and 5.
  • the transmission of the magnetic flux through the pole pieces 2 and 3 lead • for forming a magnetic north and south pole at the tube ends 9 and 10 between which the magnetic liquid is held. 11
  • Fig. 2 shows a development of the device according to the invention
  • the pipes 4 and 5 to be connected are made of non-magnetizable material.
  • the pole shoes 2 and 3 are attached to the ends of the tube ends 9 and 10 of the non-magnetizable tubes 4 and 5.
  • the pole shoe 2 is divided into two to maintain the secondary gap 7.
  • a magnet part 2a of the pole piece 2 is in direct contact with the magnet 6 and a pipe part 2b of the pole piece 2 is attached to the end of the pipe end 9.
  • the tubular part 2b and the magnetic part 2a form the secondary gap 7.
  • the annular gap 1 is formed, which has the required different magnetic polarity
  • FIG. 3a and 3b show axial views of the device according to the invention seen from the tube 4. The two views are partially cut away in order to recognize the formation of the magnet 6.
  • a circular cross section of the pipes 4 and 5 to be connected In this representation of the device according to the invention a circular cross section of the pipes 4 and 5 to be connected.
  • an annular magnet 6 is provided, which is fixed between the pole pieces 2 and 3. 3b, on the other hand, two opposite individual magnets 6 are arranged, which are also fixed between the pole pieces 2 and 3.
  • Pole shoes 2 and 3 have a different shape here. This shape is necessary in order to optimize the magnetic field formation in the direction of the annular gap 1.
  • the tube 4 forms the ' secondary gap 7 with the pole piece 2.
  • two magnets 6 are shown in an individual arrangement by way of example, but depending on sealing problems to be solved between two tubes 4 and 5, the further arrangement of magnets 6 is advantageously possible. It would then be necessary to adapt the shape of the pole shoes 2 and 3.
  • Fig. 4 shows an example of an embodiment of the invention in which funnel-shaped extensions or constrictions of pipe ends are brought together.
  • the magnet arrangement 8 corresponds to the magnet arrangement 8 in FIG. 1.
  • FIG. 5 allows, by arranging a circumferential barrier 12, which forms an axial gap 13 with the pole shoe 2, to build up a magnetic counterforce which counteracts the attraction between the end faces 14 and 15. This is achieved in that the barrier 12 is also magnetically polarized with respect to the pole piece 2.
  • 6a to 6g show different embodiments of the annular gap 1 or of the end faces 14 and 15 which delimit the annular gap 1 in the axial direction.
  • the magnetic fluid 11 is arranged in the annular gap 1.
  • the magnet 6 of the magnet arrangement 8 is fastened directly on the tube wall 5a.
  • the pole piece 2 transmits the magnetic field across the secondary gap 7 to the tube end 9 of the soft magnetic tube 4.
  • the magnet 6 is arranged on the tube end 10, the magnet 6 being designed as a ring magnet.
  • a pole ring 16 is attached directly to the magnet 6 and forms the annular gap 1 with its end face 14 and the end face 15 of the tube end 9.
  • the pole piece 3 is guided across the magnet 6 and the annular gap 1 to the tube end 9. Here it forms the secondary gap 7 with the tube wall 4a of the soft magnetic tube 4.
  • Pole shoe 30 10 tube end a magnetic part b tube part 11 magnetic fluid

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

L'invention concerne un dispositif pour rendre étanche une fente annulaire. Elle a pour but d'obtenir un dispositif pour rendre étanche une fente annulaire au moyen d'un liquide magnétique permettant que deux extrémités de tube soient disposés hermétiquement, axialement, sans contact, de façon qu'il ne se produise aucun échange entre le milieu fluide dans les tubes et l'environnement, que le liquide magnétique ne se mélange pas avec ledit milieu fluide et de manière que les tubes puissent être entraînés par translation et en rotation, sans friction les uns par rapport aux autres. A cet effet, l'invention est caractérisée en ce que les extrémités des tubes formant une fente annulaire sont liées par conduction magnétique avec les pôles d'un dispositif magnétique fixé autour de la zone de la fente annulaire, et en ce qu'un liquide magnétique est disposé dans ladite fente annulaire.
PCT/EP2000/003559 1999-04-20 2000-04-19 Dispositif pour rendre etanche une fente annulaire WO2000063595A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47494/00A AU4749400A (en) 1999-04-20 2000-04-19 Device for sealing an annular gap

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19918839.4 1999-04-20
DE1999118839 DE19918839A1 (de) 1999-04-20 1999-04-20 Vorrichtung zum Abdichten eines Ringspaltes

Publications (2)

Publication Number Publication Date
WO2000063595A2 true WO2000063595A2 (fr) 2000-10-26
WO2000063595A3 WO2000063595A3 (fr) 2001-04-26

Family

ID=7905858

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/003559 WO2000063595A2 (fr) 1999-04-20 2000-04-19 Dispositif pour rendre etanche une fente annulaire

Country Status (3)

Country Link
AU (1) AU4749400A (fr)
DE (2) DE19918839A1 (fr)
WO (1) WO2000063595A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012048157A2 (fr) * 2010-10-09 2012-04-12 M-I L.L.C. Appareil et procédés de gestion de fuite magnétiques
CN108662149A (zh) * 2018-06-06 2018-10-16 安徽普氏生态环境工程有限公司 一种磁性密封结构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU675248A1 (en) 1978-03-23 1979-07-25 Georgij A Lekomtsev Magnet-liquid seal
US4830384A (en) 1987-06-29 1989-05-16 Ferrofluidics Corporation Compact long-life magnetic fluid seal

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE851880C (de) * 1948-12-23 1952-10-09 Adolf Dr Razdowitz Dichtung
FR1297265A (fr) * 1961-05-17 1962-06-29 Nouveau procédé et dispositif de joints étanches
DE1209822B (de) * 1962-11-20 1966-01-27 Alsacienne Atom Vorrichtung zum dichten Einfuegen einer Filterscheibe zwischen die Enden zweier Rohre
AT277686B (de) * 1965-04-09 1970-01-12 Ife Ges Fuer Maschinen Und App Spaltdichtung
DE1956759C3 (de) * 1969-11-12 1974-06-12 Dornier System Gmbh, 7990 Friedrichshafen Spaltdichtung zwischen einer Fläche und einem relativ zu dieser Fläche beweglichen und mit der Fläche einen abgeschlossenen Innenraum bildenden Körper mit einer der Fläche gegenüberliegenden Dichtleiste
US4171818A (en) * 1977-04-04 1979-10-23 Ferrofluidics Corporation Dynamic lip seal using ferrofluids as sealant/lubricant
JPH0198765A (ja) * 1987-10-06 1989-04-17 Mitsubishi Electric Corp 磁気密閉装置
AU4863093A (en) * 1992-10-08 1994-04-21 Ferrofluidics Corporation Ferrofluidic seal centering ring
US5660397A (en) * 1994-09-23 1997-08-26 Holtkamp; William H. Devices employing a liquid-free medium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU675248A1 (en) 1978-03-23 1979-07-25 Georgij A Lekomtsev Magnet-liquid seal
US4830384A (en) 1987-06-29 1989-05-16 Ferrofluidics Corporation Compact long-life magnetic fluid seal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012048157A2 (fr) * 2010-10-09 2012-04-12 M-I L.L.C. Appareil et procédés de gestion de fuite magnétiques
WO2012048157A3 (fr) * 2010-10-09 2012-07-12 M-I L.L.C. Appareil et procédés de gestion de fuite magnétiques
US9476277B2 (en) 2010-10-09 2016-10-25 M-I L.L.C. Magnetic leak management apparatus and methods
CN108662149A (zh) * 2018-06-06 2018-10-16 安徽普氏生态环境工程有限公司 一种磁性密封结构

Also Published As

Publication number Publication date
WO2000063595A3 (fr) 2001-04-26
DE20007579U1 (de) 2000-09-28
AU4749400A (en) 2000-11-02
DE19918839A1 (de) 2000-11-30

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