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WO1988008495A1 - Multistage sealing device with ferrofluid - Google Patents

Multistage sealing device with ferrofluid Download PDF

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Publication number
WO1988008495A1
WO1988008495A1 PCT/DE1988/000214 DE8800214W WO8808495A1 WO 1988008495 A1 WO1988008495 A1 WO 1988008495A1 DE 8800214 W DE8800214 W DE 8800214W WO 8808495 A1 WO8808495 A1 WO 8808495A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
sealing
filled
sealing device
plastic
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.)
Ceased
Application number
PCT/DE1988/000214
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German (de)
French (fr)
Inventor
Iris Diesing
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FI885967A priority Critical patent/FI885967A7/en
Priority to JP63502816A priority patent/JPH02503705A/en
Priority to KR1019880701724A priority patent/KR900700802A/en
Publication of WO1988008495A1 publication Critical patent/WO1988008495A1/en
Priority to DK719888A priority patent/DK719888D0/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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

  • FIG. 1 There are multi-stage sealing devices with ferrofluid on the market which are produced according to FIG. 1 according to patent DE 2034213 C3. These consist of several rod permanent magnets or an axially magnetized permanent magnet ring (1) distributed around the shaft made of magnetizable stainless steel (5), and two pole rings made of magnetizable stainless steel (2) sealed with respect to the housing (4) with O-rings (3). Either the shaft (5) or the pole rings (2) are provided with sealing steps (7) for guiding the magnetic flux, the sealing step gaps being filled with ferrofluid (6) to achieve a gas-tight seal between the left and the right seal side.
  • the magnetic flux closes as indicated in FIG. 1 by field lines provided with directional arrows: permanent magnet ring (1) - right pole ring made of magnetizable stainless steel (2) - ferrofluid in the right sealing stage columns (6) - right sealing stages (7) - shaft made of magnetizable stainless steel (5) - left sealing steps (7) - ferrofluid in the left sealing step columns (6) - left pole ring magnetizable stainless steel (2) - permanent magnet ring (1).
  • This sealing device has the following disadvantages:.
  • the pole rings * must be sealed against the housing with O-rings.
  • the pole rings must be fixed to their seats with fasteners.
  • the shaft must be made of expensive stainless steel or at least a stainless steel bushing must be attached to the shaft.
  • the plastic material used is compared to the previously used magnetic material and the stainless steel material and processing much cheaper.
  • the plastic material used can at the same time make the static sealing with respect to the housing, which was previously done by O-rings.
  • REPLACEMENT LEAF 5 Because of the simple handling of the plastic block, which is simply pressed into the housing, the user can normally manufacture the shaft to be sealed (for example, a rotating union) and only the sealing element from a closed block made of plastic filled with magnetic particles and, if necessary buy a socket made of plastic filled with magnetic particles in addition to the ferrofluid.
  • the invention is therefore very suitable as a catalog item.
  • FIG 1 shows the prior art
  • FIG. 2 shows, according to patent claim 1, the sealing element consisting of a closed block made of plastic filled with magnetic particles, pressed into a housing (6).
  • the sealing element has no sealing steps. Rather, they are attached to the surface of the shaft made of magnetizable material.
  • FIG. 3 shows the sealing element consisting of a closed block made of plastic filled with magnetic particles.
  • the sealing steps are attached to the inner diameter of the sealing element.
  • REPLACEMENT LEAF Figure 4 shows according to claim 2, the multi-stage sealing device according to claim 1 with a mounted on the shaft sleeve made of plastic filled with magnetic particles.
  • the shaft can be made of non-magnetic material.
  • the sealing steps are applied to the surface of the bush.
  • FIG. 5 shows an embodiment with sealing stages attached to the inside diameter of the sealing element.
  • Figure 6 shows a sealing device according to Patent ⁇ claims 1 and 3.
  • the sealing element made of a closed block made of plastic filled with magnetic particles is pressed onto the shaft, the sealing stages are attached to the outer diameter of the sealing element, the magnetic circuit closes via the bush pressed into the housing made of plastic filled with magnetic particles.
  • FIG. 7 shows an exemplary embodiment according to patent claims 1 and 3, the sealing steps being located on the inside diameter of the
  • REPLACEMENT LEAF pressed shaft made of plastic filled with magnetic particles made of plastic filled with magnetic particles.
  • Figure 8 explains claims 5 and 6. Both in the sealing element according to claim 1 and in the bushings according to claim 2 (via the shaft) and claim 3 (in the housing) spring elements (1), reinforcements (2), separate axial magnets (3) and separate radial magnets (4) can be inserted.
  • FIG. 9 shows an exemplary embodiment according to patent claims 1 and 2.
  • the multi-stage sealing device is installed between two ball bearings in a rotary feedthrough, which transmits, for example, a rotary movement in a gas-tight sealed manner.
  • FIG. 10 shows an exemplary embodiment according to claim 1.
  • the multi-stage sealing device is installed, for example, in a rotary feedthrough which, for example, transmits rotary movements in a gas-tight manner in a crystal pulling system.
  • the multi-stage sealing device is installed, for example, in a rotary feedthrough which, for example, transmits rotary movements in a gas-tight manner in a crystal pulling system.
  • the multi-stage sealing device is installed, for example, in a rotary feedthrough which, for example, transmits rotary movements in a gas-tight manner in a crystal pulling system.
  • FIG 11 explains the claim 4.
  • the multi-stage sealing element made of a closed block made of plastic filled with magnetic particles consists of several magnetic areas. In this exemplary embodiment there are three magnetic areas, but there can be any number.
  • the field lines provided with directional arrows explain the closed magnetic flow.
  • Figure 12 explains claim 4 in conjunction with claim 3.
  • a bushing made of plastic filled with magnetic particles is pressed into the housing and carries the sealing steps on the inside diameter.

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

Abstract

A hollow magnetic sealing element, comprising a closed block made of plastic filled with magnetic particles, pressed into a housing, surrounds a rotating shaft made of magnetizable material. A magnetic liquid, ferrofluid, is located between sealing layers, which conduct the magnetic flux, and the surface of the shaft. This forms a gas-light seal between the left and right sides of the hollow sealing element. In comparison with the state of the art, fewer structural components are required, handling is simplified, and materials and production costs are reduced.

Description

Beschreibung description

Mehrstufige Dichtungsvorrichtung mit FerrofluidMulti-stage sealing device with ferrofluid

Auf dem Markt befinden sich mehrstufige Dichtungs¬ vorrichtungen mit Ferrofluid die gemäß Figur 1 nach dem Patent DE 2034213 C3 hergestellt sind. Diese bestehen aus mehreren um die Welle aus magnetisier¬ barem Edelstahl (5) verteilten Stabdauermagneten oder einem axial magnetisierten Dauermagnetring (1) , und zwei gegenüber dem Gehäuse (4) mit O-Ringen (3) abgedichteten Polringen aus magnetisierbarem Edelstahl (2) . Entweder ist die Welle (5) oder es sind die Polringe (2) mit Dichtstufen (7) zur Führung des Magnetflusses versehen, wobei die Dichtstufenspalte mit Ferrofluid (6) zur Erzielung einer gasdichten Abdichtung der linken gegenüber der rechten Dichtungsseite gefüllt sind.There are multi-stage sealing devices with ferrofluid on the market which are produced according to FIG. 1 according to patent DE 2034213 C3. These consist of several rod permanent magnets or an axially magnetized permanent magnet ring (1) distributed around the shaft made of magnetizable stainless steel (5), and two pole rings made of magnetizable stainless steel (2) sealed with respect to the housing (4) with O-rings (3). Either the shaft (5) or the pole rings (2) are provided with sealing steps (7) for guiding the magnetic flux, the sealing step gaps being filled with ferrofluid (6) to achieve a gas-tight seal between the left and the right seal side.

Der Magnetfluß schließt sich wie in Figur 1 durch mit Richtungspfeilen versehenen Feldlinien angegeben: Dauermagnetring (1) - rechter Polring aus magnetisierbarem Edelstahl (2) - Ferrofluid in den rechten Dichtstufenspalten (6) - rechte Dicht¬ stufen (7) - Welle aus magnetisierbarem Edelstahl (5) - linke Dichtstufen (7) - Ferrofluid in den linken Dichtstufenspalten (6) - linker Polring aus magnetisierbarem Edelstahl (2) - Dauermagnetring (1) .The magnetic flux closes as indicated in FIG. 1 by field lines provided with directional arrows: permanent magnet ring (1) - right pole ring made of magnetizable stainless steel (2) - ferrofluid in the right sealing stage columns (6) - right sealing stages (7) - shaft made of magnetizable stainless steel (5) - left sealing steps (7) - ferrofluid in the left sealing step columns (6) - left pole ring magnetizable stainless steel (2) - permanent magnet ring (1).

Diese Dichtungsvorrichtung hat folgende Nachteile: .This sealing device has the following disadvantages:.

1. Für den Dauermagnetring oder die bei größeren Dichtungen verwendeten Stabdauermagnetringe steht nur ein begrenztes Volumen an magnetischer Masse und damit . an magnetischer Energie zur Verfügung.1. For the permanent magnet ring or the rod permanent magnet rings used for larger seals, there is only a limited volume of magnetic mass and thus. of magnetic energy.

2. Die Polringe* müssen mit O-Ringen gegenüber dem Gehäuse abgedichtet werden.2. The pole rings * must be sealed against the housing with O-rings.

3. Für die Polringe muß teurer magnetisierbarer Edelstahl verwendet werden. (Rostansätze können zur Zersetzung des Ferrofluids führen) .3. Expensive magnetizable stainless steel must be used for the pole rings. (Rust deposits can lead to decomposition of the ferrofluid).

4. Die Montage der mindestens drei Bauteile Dauermagnetring (oder mehrere Stabdauermagnete) und zwei Polringe muß mit großer Sorgfalt an ihre konstruktionsmäßig mit kleinen Toleranzen vorgesehenen Sitze erfolgen.4. The assembly of the at least three permanent magnet ring components (or several permanent magnet magnets) and two pole rings must be carried out with great care on their seats, which are designed with small tolerances.

5. Die Polringe müssen an ihren Sitzen mit Befestigungs¬ mitteln fixiert werden.5. The pole rings must be fixed to their seats with fasteners.

6. Die Welle muß aus teurem nichtrostenden Edelstahl sein oder es muß zumindest eine Buchse aus nichtrostendem Edelstahl auf der Welle angebracht sein.6. The shaft must be made of expensive stainless steel or at least a stainless steel bushing must be attached to the shaft.

ERSÄTZBLATT Der Erfindung liegt die Aufgabe zugrunde, die vorste¬ henden Nachteile zu vermeiden und die nachstehend an¬ gegebenen Vorteile zu erzielen. Die Aufgabe wird durch die in Anspruch 1 angegebenen Merkmale gelöst.REPLACEMENT LEAF The object of the invention is to avoid the above disadvantages and to achieve the advantages given below. The object is achieved by the features specified in claim 1.

Vorteile der Erfindung:Advantages of the invention:

1. Die mindestens drei Bauteile Dauermagnetring und zwei Polringe der bisherigen Ausführung werden durch ein einziges Bauteil aus mit magnetischen Partikeln gefülltem Kunststoff ersetzt.1. The at least three components permanent magnet ring and two pole rings of the previous version are replaced by a single component made of plastic filled with magnetic particles.

2. Das verwendete Kunststof material ist gegenüber dem bisher verwendeten Magnetmaterial und dem rostfreien Edelstahl vom Material und der Verarbeitung her wesentlich preisgünstiger.2. The plastic material used is compared to the previously used magnetic material and the stainless steel material and processing much cheaper.

3. Das verwendete Kunststoffmaterial kann gleichzeitig die bisher durch O-Ringe erfolgte statische Abdichtung gegenüber dem Gehäuse vornehmen.3. The plastic material used can at the same time make the static sealing with respect to the housing, which was previously done by O-rings.

4. Buchsen aus mit magnetischen Partikeln gefülltem Kunststoff erlauben Wellen aus unmagnetischem und nicht rostfreien Material.4. Bushings made of plastic filled with magnetic particles allow shafts made of non-magnetic and non-rusting material.

ERSÄTZBLATT 5. Durch die einfache Handhabung des einfach in das Gehäuse gepreßten Kunststoffblocks kann sich der Anwender im Normalfalle seine abzudichtende Welle (zum Beispiel eine Drehdurchführung) selbst her¬ stellen und nur das Dichtungselement aus einem ge¬ schlossenen Block aus mit magnetischen Partikeln gefüllten Kunststoff und gegebenenfalls noch eine Buchse aus mit magnetischen Partikeln gefüllten Kunststoff nebst dem Ferrofluid kaufen. Die Erfindung eignet sich also sehr gut als Katalogartikel.REPLACEMENT LEAF 5. Because of the simple handling of the plastic block, which is simply pressed into the housing, the user can normally manufacture the shaft to be sealed (for example, a rotating union) and only the sealing element from a closed block made of plastic filled with magnetic particles and, if necessary buy a socket made of plastic filled with magnetic particles in addition to the ferrofluid. The invention is therefore very suitable as a catalog item.

6. Dadurch, daß das gesamte Dichtelement aus mit magnetischen Partikeln gefülltem Kunststoff besteht, ist auch das Volumen an magnetischer Masse größer gegenüber der bisherigen Ausführung, damit ist auch die unterzubringende magnetische Ene'rgie größer» Die Verwendung teurer Magnete, zum Beispiel aus seltenen Erden entfällt. Beschreibung der Abbildungen6. The fact that the entire sealing element consists of filled with magnetic particles of plastic, and the volume of magnetic mass is greater compared to the previous embodiments, so is also be housed magnetic Ene 'rgy greater "The use of expensive magnets, such as rare earth not applicable. Description of the pictures

Figur 1 zeigt den bisherigen Stand der TechnikFigure 1 shows the prior art

Figur 2 zeigt gemäß Patentanspruch 1 das aus einem geschlossenen Block aus mit magnetischen Partikeln gefülltem Kunststoff bestehende Dichtungselement, ein¬ gepreßt in ein Gehäuse (6) .FIG. 2 shows, according to patent claim 1, the sealing element consisting of a closed block made of plastic filled with magnetic particles, pressed into a housing (6).

In diesem Ausführungsbeispiel hat das Dichtungselement keine Dichtstufen. Diese sind vielmehr an der Oberfläche der aus magnetisierbarem Material bestehenden Welle angebracht.In this exemplary embodiment, the sealing element has no sealing steps. Rather, they are attached to the surface of the shaft made of magnetizable material.

Die mit Richtungspfeilen versehenen Feldlinien (1) erklären den durch Dichtungselement (2) , Ferrofluid im Dichtstufenspalt (3) , Dichtstufe (4) auf der einen Seite, dann durch die Welle (5), Dichtstufe (4) , Ferrofluid im Dichtstufenspalt (3) und zurück zum Dichtungselement (2) auf der anderen Seite ge¬ schlossenen Magnetfluß.The field lines (1) provided with directional arrows explain that through the sealing element (2), ferrofluid in the sealing step gap (3), sealing step (4) on one side, then through the shaft (5), sealing step (4), ferrofluid in the sealing step gap (3 ) and back to the sealing element (2) on the other side closed magnetic flux.

Figur 3 zeigt das gemäß Patentanspruch 1 aus einem geschlosseen Block aus mit magnetischen Partikeln gefülltem Kunststoff bestehende Dichtungselement. In diesem Ausführungsbeispiel sind die Dichtstufen am Innendurchmesser des Dichtungselementes angebracht.FIG. 3 shows the sealing element consisting of a closed block made of plastic filled with magnetic particles. In this embodiment, the sealing steps are attached to the inner diameter of the sealing element.

ERSATZBLATT Figur 4 zeigt gemäß Patentanspruch 2 die mehrstufige Dichtungsvorrichtung nach Patentanspruch 1 mit einer auf der Welle angebrachten Buchse aus mit magnetischen Partikeln gefülltem Kunststoff. In diesem Falle kann die Welle aus unmagnetischem Material sein. In diesem Ausführungsbeispiel sind die Dichtstufen auf der Buchsenoberfläche angebrach .REPLACEMENT LEAF Figure 4 shows according to claim 2, the multi-stage sealing device according to claim 1 with a mounted on the shaft sleeve made of plastic filled with magnetic particles. In this case the shaft can be made of non-magnetic material. In this embodiment, the sealing steps are applied to the surface of the bush.

Figur 5 zeigt ein Ausführungsbeispiel mit am Innen¬ durchmesser des Dichtungselementes angebrachten Dichtstufen.FIG. 5 shows an embodiment with sealing stages attached to the inside diameter of the sealing element.

Figur 6 zeigt eine DichtungsVorrichtung gemäß Patent¬ anspruch 1 und 3. Das Dichtungselement aus einem geschlossenen Block aus mit magnetischen Partikeln gefülltem Kunststoff ist auf die Welle aufgepreßt, die Dichtstufen sind am Außendurchmesser des Dichtungselementes angebracht, der Magnetkreis schließt über die in das Gehäuse eingepreßte Buchse aus mit magnetischen Partikeln gefüllten Kunststoff.Figure 6 shows a sealing device according to Patent¬ claims 1 and 3. The sealing element made of a closed block made of plastic filled with magnetic particles is pressed onto the shaft, the sealing stages are attached to the outer diameter of the sealing element, the magnetic circuit closes via the bush pressed into the housing made of plastic filled with magnetic particles.

Figur 7 zeigt ein Ausführungsbeispiel gemäß Patentanspruch 1 und 3, wobei die Dichtstufen sich am Innendurchmesser der in das Gehäuse einge-FIG. 7 shows an exemplary embodiment according to patent claims 1 and 3, the sealing steps being located on the inside diameter of the

ERSATZBLATT preßten Welle aus mit magnetischen Partikeln gefülltem Kunststoff befinden.REPLACEMENT LEAF pressed shaft made of plastic filled with magnetic particles.

Figur 8 erläutert den Patentanspruch 5 und 6. Sowohl in das Dichtungselement nach Patent¬ anspruch 1 als auch in die Buchsen nach Patentanspruch 2 (über die Welle) und Patentanspruch 3 (in das Gehäuse) können Federelemente (1) , Verstärkungen (2) , separate axiale Magnete (3) und separate radiale Magnete (4) eingelegt werden.Figure 8 explains claims 5 and 6. Both in the sealing element according to claim 1 and in the bushings according to claim 2 (via the shaft) and claim 3 (in the housing) spring elements (1), reinforcements (2), separate axial magnets (3) and separate radial magnets (4) can be inserted.

Figur 9 zeigt ein Ausführungsbeispiel nach Patent¬ anspruch 1 und 2. Die mehrstufige Dichtungs¬ vorrichtung ist in eine Drehdurchführung, die zum Beispiel eine Drehbewegung in einen Vakuumkessel gasdicht abgedichtet überträgt zwischen zwei Kugellager eingebaut.FIG. 9 shows an exemplary embodiment according to patent claims 1 and 2. The multi-stage sealing device is installed between two ball bearings in a rotary feedthrough, which transmits, for example, a rotary movement in a gas-tight sealed manner.

Figur 10 zeigt ein Ausführungsbeispiel nach Patentanspruch 1. Die mehrstufige Dichtungs¬ vorrichtung ist zum Beispiel in eine Dreh¬ durchführung eingebaut, die beispielsweise Drehbewegungen gasdicht abgedichtet in eine Kristallziehanlage überträgt. Hier ist die mehrstufige DichtungsvorrichtungFIG. 10 shows an exemplary embodiment according to claim 1. The multi-stage sealing device is installed, for example, in a rotary feedthrough which, for example, transmits rotary movements in a gas-tight manner in a crystal pulling system. Here is the multi-stage sealing device

ERSATZBLATT vor die Kugellager direkt an den Montageflansch plaziert.ER S ATZBLATT in front of the ball bearings placed directly on the mounting flange.

Figur 11 erläutert den Patentanspruch 4. Das mehrstufige Dichtungselement aus einem geschlossenen Block aus mit magnetischen Partikeln gefülltem Kunststoff besteht aus mehreren magnetischen Bereichen. In diesem Ausführungsbeispiel sind es drei magnetische Bereiche, es können aber beliebig viele sein. Die mit Richtungspfeilen versehenen Feldlinien erläutern den geschlossenen magnetischen Flu .Figure 11 explains the claim 4. The multi-stage sealing element made of a closed block made of plastic filled with magnetic particles consists of several magnetic areas. In this exemplary embodiment there are three magnetic areas, but there can be any number. The field lines provided with directional arrows explain the closed magnetic flow.

Figur 12 erläutert den Patentanspruch 4 in Verbindung mit Patentanspruch 3. Eine Buchse aus mit magnetischen Partikeln gefülltem Kunststoff ist in das Gehäuse gepreßt und trägt die Dichtstufen am Innendurchmesser. Figure 12 explains claim 4 in conjunction with claim 3. A bushing made of plastic filled with magnetic particles is pressed into the housing and carries the sealing steps on the inside diameter.

Claims

Ansprüche Expectations 1. Mehrstufige Dichtungsvorrichtung in Form eines hohlen magnetisierten Dichtungselementes, das eine drehbare oder stehende Welle aus magnetisierbarem Material ringförmig umschließt, wobei die seitlichen Bereiche als Polschuhe wirken und mehrere Dichtstufenspalte mit der Wellenoberfläche oder der Gehäuseinnenfläche bilden über die sich ein Magnetkreis schließt und von denen mindestens ein oder mehrere Dichtstufenspalten mindestens eines seitlichen Bereichs mit Ferrofluid gefüllt sind, dadurch ge¬ kennzeichnet, daß das Dichtungselement aus einem ge¬ schlossenen Block aus mit magnetischen Partikeln gefülltem Kunststoff besteht.1.Multi-stage sealing device in the form of a hollow magnetized sealing element which surrounds a rotatable or standing shaft made of magnetizable material in an annular manner, the lateral areas acting as pole shoes and forming several sealing step gaps with the shaft surface or the inner surface of the housing, via which a magnetic circuit closes and at least of which one or more sealing step gaps of at least one lateral area are filled with ferrofluid, characterized in that the sealing element consists of a closed block made of plastic filled with magnetic particles. 2. Dichtungsvorrichtung nach Anspruch 1, dadurch gekenn¬ zeichnet, daß eine Buchse aus mit magnetischen Parti¬ keln gefülltem Kunststoff die Welle umschließt.2. Sealing device according to claim 1, characterized gekenn¬ characterized in that a socket made of magnetic Parti¬ keln filled plastic surrounds the shaft. 3. Dichtungsvorrichtung nach Anspruch 1, dadurch gekenn¬ zeichnet, daß eine Buchse aus mit magnetischen Parti¬ keln gefülltem Kunststoff in das Gehäuse eingesetzt ist. 3. Sealing device according to claim 1, characterized gekenn¬ characterized in that a socket made of magnetic Parti¬ keln filled plastic is inserted into the housing. 4. Dichtungsvorrichtung nach Anspruch 1, dadurch gekenn¬ zeichnet, daß das aus einem geschlossenen Block aus mit magnetischen Partikeln gefülltem Kunststoff be¬ stehende Dichtungselement aus mehreren magnetischen Bereichen besteht.4. Sealing device according to claim 1, characterized gekenn¬ characterized in that the be¬ consisting of a closed block of magnetic particle-filled plastic sealing element consists of several magnetic areas. 5. Dichtungsvorrichtung nach den Ansprüchen 1 und 4, da¬5. Sealing device according to claims 1 and 4, da¬ durch gekennzeichnet, daß in den geschlossenen Block aus mit magnetischen Partikeln gefülltem Kunststoff Fede elemente, Verstärkungselemente und oder separate Dauermagnete eingelegt sind.characterized in that elements, reinforcing elements and or separate permanent magnets are inserted into the closed block made of plastic filled with magnetic particles. 6. Dichtungsvorrichtung nach den Ansprüchen 2 und 3, da¬ durch gekennzeichnet, daß in die Buchse aus mit magnetischen Partikeln gefülltem Kunststoff Feder¬ elemente, Verstärkungselemente und oder separate Dauermagnete eingelegt sind. 6. Sealing device according to claims 2 and 3, da¬ characterized in that Feder¬ elements, reinforcing elements and or separate permanent magnets are inserted into the socket made of plastic filled with magnetic particles.
PCT/DE1988/000214 1987-04-23 1988-03-31 Multistage sealing device with ferrofluid Ceased WO1988008495A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FI885967A FI885967A7 (en) 1987-04-23 1988-03-31 Multi-stage ferrofluid-containing sealing device
JP63502816A JPH02503705A (en) 1988-03-31 1988-03-31 Multi-stage sealing device using fluid iron
KR1019880701724A KR900700802A (en) 1987-04-23 1988-03-31 Multistage sealer with iron-containing fluid
DK719888A DK719888D0 (en) 1988-03-31 1988-12-23 MULTI-STEP SEALING FERROFLUID

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3713567A DE3713567C1 (en) 1987-04-23 1987-04-23 Multi-stage sealing device with ferrofluid
DEP3713567.8 1987-04-24

Publications (1)

Publication Number Publication Date
WO1988008495A1 true WO1988008495A1 (en) 1988-11-03

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PCT/DE1988/000214 Ceased WO1988008495A1 (en) 1987-04-23 1988-03-31 Multistage sealing device with ferrofluid

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EP (1) EP0312554A1 (en)
KR (1) KR900700802A (en)
DE (1) DE3713567C1 (en)
FI (1) FI885967A7 (en)
WO (1) WO1988008495A1 (en)

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US5134331A (en) * 1990-05-31 1992-07-28 Nippon Densan Corporation Spindle motor
US7129609B1 (en) * 2005-08-30 2006-10-31 Ferrolabs, Inc. Magneto-fluidic seal with wide working temperature range

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CH674887A5 (en) * 1986-06-10 1990-07-31 Papst Motoren Gmbh & Co Kg
DE3807893C2 (en) * 1988-03-10 1994-02-24 Freudenberg Carl Fa Seal for a magnetizable shaft
DE3822198A1 (en) * 1988-04-09 1989-10-19 Lechler Elring Dichtungswerke MAGNETIC SEALING DEVICE
US5975536A (en) * 1997-09-30 1999-11-02 Rigaku/Usa, Inc. Rotary motion feedthrough with rotating magnet system
DE102006051992B3 (en) * 2006-11-03 2008-01-31 Dtg - Development & Technology Gmbh Magnetic fluid seal for sealing of shaft or axle against hub, has magnet with rubber elastic material with two radial projections and magnetic poles of different polarity are formed, whose tips are in contact with counter direction position
CN106122285B (en) * 2016-09-09 2018-03-20 广西科技大学 A kind of circular cone type device for sealing magnetic fluid

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US7129609B1 (en) * 2005-08-30 2006-10-31 Ferrolabs, Inc. Magneto-fluidic seal with wide working temperature range
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Also Published As

Publication number Publication date
EP0312554A1 (en) 1989-04-26
DE3713567C1 (en) 1987-12-03
FI885967A7 (en) 1989-10-01
KR900700802A (en) 1990-08-17
FI885967L (en) 1988-12-23

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