SE526437C2

SE526437C2 - Bearing arrangement involves inner ring sealed by seals against outer rings, forming together a closed bearing unit with a built-in circulation circuit for a lubricating oil vapor

Info

Publication number: SE526437C2
Application number: SE0400563A
Authority: SE
Inventors: Kjell Klintenstedt
Original assignee: Alfa Laval Corp Ab
Priority date: 2004-03-04
Filing date: 2004-03-04
Publication date: 2005-09-13
Also published as: SE0400563D0; SE0400563L

Abstract

The bearing arrangement involves an inner ring (8) sealed by seals (10) against outer rings (9), forming together a closed bearing unit with a built-in circulation circuit (11,19) for a lubricating oil vapor. In the circulation circuit are roller bodies (12) and roller tracks (13,14,15,18) which are lubricated by the oil vapor. Facilities are provided for forming a lubricating oil vapor out of a container (17) which is made to flow by devices (20) in the circulation circuit.

Description

20 25 30 526 f? 4,9? ut i en luftström, vilket orsakar en icke önskad uppvärmning av smörjoljan. Ändamålet med den föreliggande uppfinningen är att åstadkomma en enkel och kompakt lageranordning, i vilken ett slutet smörjoljesystem, som möjliggör en tillförlitlig och underhållsfri smörjning under lageranord- ningens livslängd utan onödig uppvärmning och förorening av smörjoljan, är anordnatl Ett speciellt ändamål med uppﬁnningen är att uppnå detta i en lageranordning som används för att roterbart uppbära en rotor i en centrifugalseparator och i ett sätt att roterbart uppbära en rotor i en centrifugalseparator, vilket ställer extra höga krav på lageranordningen och smörjningen av densamma. 20 25 30 526 f? 4.9? into an air stream, which causes an unwanted heating of the lubricating oil. The object of the present invention is to provide a simple and compact bearing device, in which a closed lubricating oil system, which enables a reliable and maintenance-free lubrication during the service life of the bearing device without unnecessary heating and contamination of the lubricating oil, is arranged to achieve a special object. this in a bearing device used to rotatably support a rotor in a centrifugal separator and in a method of rotatably supporting a rotor in a centrifugal separator, which places extra high demands on the bearing device and its lubrication.

Enligt den föreliggande uppﬁnningen åstadkommes detta genom att lageranordningens roterbara innerring är avtätad med hjälp av tätningar mot den icke roterande ytterringen och bildar tillsammans med den icke roterbara ytterringen en sluten lagerenhet. l denna lagerenhet är rullkropparna, den första och den andra rullbanan, behållaren för smörjolja och nämnda medel för att under drift bilda en oljedimma innehållande smörjoljedroppar från denna behållare och medel för att bringa oljedimman att strömma axiellt förbi och i smörjande kontakt med rullkropparna och rullbanoma anordnade. Det utrymme, i vilket rullkropparna är anordnade, bildar en första ﬂödeskanaldel, vilken sträcker sig axiellt från den ena sidan om rullkroppama axiellt förbi rullkroppama till den axiellt motsatta sidan om rullkroppama. Denna ﬂödeskanaldel bildar tillsammans med en andra ﬂödeskanaldel, som är bildad i ytterringen och är ansluten till den första ﬂödeskanaldelen vid båda axiella sidoma om rullkropparna, en cirkulationsﬂödeskrets för oljedimma under drift, vilken cirkulationsﬂödeskrets kommunicerar med det inre av behållaren för smörjolja. 10 15 20' 25 30 Företrädesvis är rotationsaxeln väsentligen vertikalt orienterad, varvid behållaren för smörjolja är belägen nedanför rullkropparna.According to the present invention, this is achieved in that the rotatable inner ring of the bearing device is sealed by means of seals against the non-rotating outer ring and together with the non-rotatable outer ring forms a closed bearing unit. In this bearing unit, the roller bodies, the first and second roller tracks, the container for lubricating oil and said means for forming during operation an oil mist containing lubricating oil droplets from this container and means for causing the oil mist to flow axially past and in lubricating contact with the roller bodies and roller tracks . The space in which the roller bodies are arranged forms a first ﬂ channel channel part, which extends axially from one side of the roller bodies axially past the roller bodies to the axially opposite side of the roller bodies. This ﬂ fate channel part forms together with a second ﬂ fate channel part, which is formed in the outer ring and is connected to the first ﬂ fate channel part at both axial sides of the roller bodies, a circulating ﬂ fate circuit for oil mist during operation, which circulation fate circuit communicates with the interior of the container. Preferably, the axis of rotation is substantially vertically oriented, the container for lubricating oil being located below the roller bodies.

Enligt en föredragen utföringsform av uppﬁnningen innefattar nämnda medel för att bringa oljedimman att strömma förbi och i smörjande kontakt med rullkroppama och rullbanorna ett i utrymmet anordnat och med innerringen 'medroterande ﬂäkthjul.According to a preferred embodiment of the invention, said means for causing the oil mist to flow past and in lubricating contact with the roller bodies and the roller tracks comprise a sprockets arranged in the space and with the inner ring 'co-rotating'.

Enligt en annan utföringsform av uppﬁnningen är behållaren formad i en roterbar del, vilken är förbunden med innerringen, och vilken del även formar ett oljeledningselement, som utgör nämnda medel för att under drift bilda en oljedimma innehållande smörjoljedroppar. Oljelednings- elementet har en oljeledningsyta, som sträcker sig från en under drift oljefylld del av behållaren till en del av cirkulationskretsen, och en kant, vilken är belägen intill cirkulationskretsen, och till vilken kant oljelednings- ytan sträcker sig och leder smörjolja under centrifugalkraftens inverkan.According to another embodiment of the invention, the container is formed in a rotatable part, which is connected to the inner ring, and which part also forms an oil line element, which constitutes said means for forming an oil mist containing lubricating oil droplets during operation. The oil line element has an oil line surface extending from a during operation oil-filled part of the container to a part of the circulation circuit, and an edge, which is located next to the circulation circuit, and to which edge the oil line surface extends and conducts lubricating oil under the influence of centrifugal force.

Från denna kant avgår smörjoljedroppar, som medbringas i den i cirkulationskretsen strömmande oljedimman.From this edge depart lubricating oil droplets, which are carried in the oil mist flowing in the circulation circuit.

Enligt ett alternativ till denna utföringsform av en lageranordning enligt uppﬁnningen är behållaren formad i en icke roterbar del, som är förbunden med ytterringen, varvid nämnda medel för att under drift bilda en oljedimma innehållande smörjoljedroppar innefattar en roterbar dimalstrande del, vilken är förbunden med innerringen och sträcker sig ned i en del av behållaren, som under drift innehåller smörjolja.According to an alternative to this embodiment of a bearing device according to the invention, the container is formed in a non-rotatable part, which is connected to the outer ring, said means for forming an oil mist containing lubricating oil droplets during operation comprising a rotatable dimal-forming part, which is connected to the inner ring and extends into a part of the container, which during operation contains lubricating oil.

Enligt en speciell utföringsform av uppﬁnningen är den första rullbanan anordnad i en del av innerringen och den andra rullbanan anordnad i en del av ytterringen. Som ett altemativ till denna utföringsform av uppﬁn- ningen kan dock enligt den föreliggande uppﬁnningen den första 10 15 20 25 (II l J .fyr Ja. (få -J rullbanan även vara anordnad i en inre lagerring förbunden med innerringen och den andra rullbanan vara anordnad i en yttre lagerring förbunden med ytterringen.According to a special embodiment of the invention, the first roller conveyor is arranged in a part of the inner ring and the second roller conveyor is arranged in a part of the outer ring. As an alternative to this embodiment of the invention, however, according to the present invention, the first 10 15 20 25 (II l J .fyr Ja. arranged in an outer bearing ring connected to the outer ring.

Enligt ytterligare en utföringsform av uppﬁnningen är lageranordningen försedd med kanaler för ett kylmedium. Ändamålet med sättet att roterbart uppbära en rotor i en centrlfugalsepa- rator åstadkommes enligt den föreliggande uppﬁnningen genom att den roterbara innerringen avtätas mot den icke roterbara ytterringen med hjälp av tätningar och bildar tillsammans med den icke roterbara ytterringen en sluten lagerenhet, i vilken rullkropparna, den första och den andra rullbanan, behållaren för smörjolja anordnas. I lagerenheten bildas en oljedimma under drift innehållande smörjoljedroppar från denna behållare. Denna oljedimma bringas att strömma i en med behållaren för smörjolja kommunicerande cirkulationskrets axiellt förbi rullkroppama och rullbanorna i smörjande kontakt med dem. Denna cirkulationskrets bildas dels av en första ﬂödeskanaldel, vilken utgörs av det utrymme, i vilket rullkroppama är anordnade, och sträcker sig axiellt från den ena sidan om rullkropparna axiellt förbi rullkropparna till den axiellt motsatta sidan om rullkropparna, och dels av en andra ﬂödeskanaldel, som är bildad i ytterringen och är ansluten till den första ﬂödeskanaldelen vid båda axiella sidorna om rullkropparna.According to a further embodiment of the invention, the storage device is provided with channels for a cooling medium. The object of the method of rotatably supporting a rotor in a central bird separator is achieved according to the present invention by sealing the rotatable inner ring against the non-rotatable outer ring by means of seals and forming together with the non-rotatable outer ring a closed bearing unit, in which the roller bodies, the first and the second roller conveyor, the container for lubricating oil is arranged. In the storage unit, an oil mist is formed during operation containing lubricating oil droplets from this container. This oil mist is caused to flow in a circulation circuit communicating with the lubricating oil container axially past the roller bodies and the roller tracks in lubricating contact with them. This circulation circuit is formed partly by a first ﬂ channel channel part, which is constituted by the space in which the roller bodies are arranged, and extends axially from one side of the roller bodies axially past the roller bodies to the axially opposite side of the roller bodies, and partly by a second ﬂ channel channel part, which is formed in the outer ring and is connected to the first ﬂ fate channel part at both axial sides of the roller bodies.

Företrädesvis är härvid rotationsaxeln väsentligen vertikalt orienterad med behållaren för smörjolja belägen nedanför rullkropparna.Preferably, the axis of rotation is substantially vertically oriented with the container for lubricating oil located below the roller bodies.

I en utföringsform av sättet enligt uppﬁnningen bringas oljedimman att strömma förbi och i smörjande kontakt med rullkropparna och rullbanorna 10 15 20 25 30 526' 437 med hjälp av ett i utrymmet anordnat och med innerringen medroterande ﬂäkfhjul.In an embodiment of the method according to the invention, the oil mist is caused to flow past and in lubricating contact with the roller bodies and the roller tracks 526 '437 by means of a spoke wheel arranged in the space and co-rotating with the inner ring.

I en speciell utföringsform av sättet enligt uppﬁnningen kyls lageranordningen med hjälp ett kylmedium, som bringas att strömma i kylkanaler bildade i lageranordningen.In a special embodiment of the method according to the invention, the storage device is cooled by means of a cooling medium, which is caused to flow in cooling channels formed in the storage device.

I det följande beskrivs några exempel pà utföringsformer av uppﬁnningen mer detaljerat med hänvisning till bifogade ritningar, pà vilka Fig. 1 schematiskt visar ett tvärsnitt genom en del av en centrifugalseparator, i vilken en lageranordning enligt uppﬁnningen är använd för att uppbära en centrifugalseparators rotor, Fig. 2 schematiskt visar ett tvärsnitt genom en lageranordning enligt en utföringsform av uppﬁnningen, Fig. 3 schematiskt visar ett tvärsnitt genom en* lageranordning enligt en annan utföringsform av uppﬁnningen, och Fig. 4 schematiskt visar en ytterligare utföringsform av uppﬁnningen, som är en förstoring av den i ﬁgur 1 som den undre lageranordningen 7 visade utföringsformen.In the following, some examples of embodiments of the invention are described in more detail with reference to the accompanying drawings, in which Fig. 1 schematically shows a cross section through a part of a centrifugal separator, in which a bearing device according to the invention is used to support a rotor of a centrifugal separator, Figs. Fig. 2 schematically shows a cross section through a bearing device according to an embodiment of the invention, Fig. 3 schematically shows a cross section through a bearing device according to another embodiment of the invention, and Fig. 4 schematically shows a further embodiment of the invention, which is an enlargement of the embodiment shown in Figure 1 as the lower bearing device 7.

Fig. 5 schematiskt visar ett tvärsnitt genom en lageranordning enligt en fjärde utföringsform av uppﬁnningen. ' Den i ﬁgur 1 visade centrifugalseparatorn har en rotor 1, som är anbringad på en remdriven axel 2. Rotorn 1 och axeln 2 uppbärs roterbart kring en vertikal rotationsaxel x i ett stativ 3 dels med hjälp av en på axeln 10 15 20 25 30 526 437 2 fast förbunden övre lageranordning 4, vilken via fjädrande element 5 och svängningsdämpande element 6 är förbunden med stativet 3 och dels med hjälp av en på axeln 2 fastförbunden undre lageranordning 7, vilken även är fast förbunden med stativet 3. Både den övre lageranordningen 4 och den undre lageranordningen 7 är utformade i enlighet med den föreliggande uppfinningen.Fig. 5 schematically shows a cross section through a bearing device according to a fourth embodiment of the invention. The centrifugal separator shown in Figure 1 has a rotor 1 which is mounted on a belt driven shaft 2. The rotor 1 and the shaft 2 are rotatably supported about a vertical axis of rotation x in a frame 3 partly by means of an on the shaft 10 15 20 25 30 526 437 2 fixedly connected upper bearing device 4, which via resilient element 5 and vibration-damping element 6 is connected to the frame 3 and partly by means of a lower bearing device 7 fixed to the shaft 2, which is also fixedly connected to the frame 3. Both the upper bearing device 4 and the lower bearing device 7 are designed in accordance with the present invention.

Den i ﬁgur 1 visade övre lageranordningen 4 visas förstorad i ﬁgur 2.The upper bearing device 4 shown in Figure 1 is shown enlarged in Figure 2.

Denna lageranordning har en innerring 8, som är inrättad att fast förbindas med en kring en rotationsaxel x roterbar axel 2, och en ytterring 9, som är inrättad att förbindas med ett icke roterbart stativ. lnnerringen 8 är avtätad mot ytterringen 9 med hjälp av tätningar 10 och mellan lnnerringen 8 och ytterringen 9 är ett utrymme 11 format, i vilket två rader av rullkroppar i form av kulor 12 är anordnade. Varje rad av rullkroppar 12 är inrättade att löpa dels i var sin rullbana 13 resp. 14, som är anordnade i lnnerringen 8, dels i var sin rullbana 15 resp. 16, som är anordnade i ytterringen 9. il lageranordningens nedre del är en behållare 17 för smörjolja anordnad i en med den roterbara lnnerringen 8 förbunden del 18. Utrymmet 11 utgör en första ﬂödeskanaldel och i ytterringen 9 bildas en andra ﬂödeskanaldel 19, som ansluter till den första ﬂödeskanaldelen 11 vid båda axiella sidoma om rullkropparna 12. Den första ﬂödeskanaldelen 11 och den andra ﬂödeskanaldelen, 19 bildar tillsammans en cirkulationsﬂödeskrets för cirkulation av en oljedimma.This bearing device has an inner ring 8, which is arranged to be fixedly connected to a shaft 2 rotatable about an axis of rotation x, and an outer ring 9, which is arranged to be connected to a non-rotatable stand. The inner ring 8 is sealed against the outer ring 9 by means of seals 10 and between the inner ring 8 and the outer ring 9 a space 11 is formed, in which two rows of roller bodies in the form of balls 12 are arranged. Each row of roller bodies 12 is arranged to run partly in their respective roller track 13 resp. 14, which are arranged in the inner ring 8, partly in their respective roller tracks 15 resp. 16, which are arranged in the outer ring 9. In the lower part of the bearing device a container 17 for lubricating oil is arranged in a part 18 connected to the rotatable inner ring 8. the first ﬂ fate channel portion 11 at both axial sides of the roller bodies 12. The first ﬂ fate channel portion 11 and the second ﬂ fate channel portion, 19 together form a circulating ﬂ fate circuit for circulating an oil mist.

Behållaren 17 för smörjolja är öppen mot cirkulationsﬂödeskretsen så att cirkulationskretsen kommunicerar med behållarens inre. För att driva cirkulationen av oljedimman i cirkulationskretsen är ett med den roterbara lnnerringen 8 förbundet ﬂäkthjul 20 anordnat. Den del18, i vilken behållaren 17 är formad, formar även ett oljeledningselement 21 för att under drift bilda en oljedimma innehållande smörjoljedroppar, som har en oljeledningsyta 22, som sträcker sig från en under drift oljefylld del av 10 15 20 25 behållaren 17 axiellt uppåt och radiellt utåt till en del av cirkulations- kretsen. Oljeledningselementet 21 har även en kant 23, vilken är belägen intill cirkulationskretsen, och till vilken kant 23 oljeledningsytan 22 sträcker sig och leder smörjolja under centrifugalkraftens inverkan, och från vilket kant 23 smörjoljedroppar avgår och medbringas i den i cirkulationskretsen strömmande oljedimman. \ﬁd behov kan en lageranordning enligt den föreliggande uppﬁnningen, såsom visas i denna utföringsform, ett gängat hål 24 för pàfyllnad av smörjolja och ett gängat hål 25 för avtappning av smörjolja. Dessa hål 24 och 25 förses förslagsvis med icke visade gängade pluggar. För att möjliggöra kylning av lageranordningen kan den, såsom också visas i denna utföringsform, vara försedd med kylkanaler 26, som är anordnade i ytterring för ett kylmedium.The lubricating oil container 17 is open to the circulation circuit so that the circulation circuit communicates with the interior of the container. In order to drive the circulation of the oil mist in the circulation circuit, a sprocket 20 connected to the rotatable inner ring 8 is provided. The part 18, in which the container 17 is formed, also forms an oil line element 21 for forming during operation an oil mist containing lubricating oil droplets, which has an oil line surface 22 extending from an oil-filled part of the container 17 axially upwards and radially outwards to a part of the circulation circuit. The oil line element 21 also has an edge 23, which is located next to the circulation circuit, and to which edge 23 the oil line surface 22 extends and conducts lubricating oil under the influence of centrifugal force, and from which edge 23 lubricating oil droplets depart and are carried in the oil mist flowing in the circulation circuit. If required, a bearing device according to the present invention, as shown in this embodiment, may have a threaded hole 24 for filling lubricating oil and a threaded hole 25 for draining lubricating oil. These holes 24 and 25 are preferably provided with threaded plugs (not shown). In order to enable cooling of the storage device, it can, as also shown in this embodiment, be provided with cooling channels 26, which are arranged in an outer ring for a cooling medium.

Under drift driver ﬂäkthjulet 20 smörjoljebemängda luften, som utgör oljedimman att cirkulera i cirkulationskretsen samtidigt som smörjolja i behållaren 17 av centrifugalkraftens inverkan drivs utmed oljelednings- ytan 22 till kanten 23 där smörjoljedroppar avgår till den i cirkulations- kretsen strömmande oljedimman och vidare in i den andra ﬂödeskanal- delen 19. En del smörjolja kryper i en smörjoljeﬁlm utefter den andra ﬂödeskanaldelens 19 radiellt yttre väggyta och drivs vidare av oljedim- ﬂödet. Även från smörjoljeﬁlmen avgår oljedroppar till oljedimman. Från den andra ﬂödeskanaldelen 19 strömmar oljedimman över i den första ﬂödeskanaldelen 11 och passerar och smörjer rullkroppama 12 och rullbanoma 13, 14, 15 och 16. En del av smörjoljan avsätter sig på den första ﬂödeskanaldelens 11 väggytor och rinner åter ner i behållaren 17 medaan resten av smörjoljan är kvar i den cirkulerande oljedimman. '10 15 20 25 30 526 437 I ﬁgur 3 visas en annan utföringsform av en lageranordning enligt uppﬁnningen, vilken skiljer sig mot den iﬁgur 2 visade utföringsformen genom att varje rad av rullkroppar 12 är inrättade att löpa dels i var sin rullbana 27 resp. 28, som är anordnade i var sin inre lagerring 29 resp. 30 förbundna med innerringen 8, dels i var sin rullbana 31 resp. 32, som år anordnade i var sin yttre lagerring 33 resp. 34 förbundna med ytterringen 9. i denna utföringsform är ﬂäkthjulet 35 utformat som en separat del, vilken är förbunden med innerringen 8 och samtidigt som ett distans- element mellan de båda inre lagerringarna 29 och 30. De båda yttre lagerringarna 33 och 34 hålls axiellt av en distansring 36. I övrigt överensstämmer utföringsformen enligt ﬁgur 3 med utföringsformen enligt ﬁgur2.During operation, the sprocket 20 drives the lubricating oil-laden air, which constitutes the oil mist to circulate in the circulation circuit while lubricating oil in the container 17 is driven by the influence of the centrifugal force along the oil conduit surface 22 to the edge 23 where lubricating oil droplets enter the ﬂ the fate channel part 19. Some lubricating oil creeps in a lubricating oil m lm along the radially outer wall surface of the other ﬂ fate channel part 19 and is further driven by the oil mist ﬂ fate. Oil droplets also escape from the lubricating oil oil to the oil mist. From the second ﬂ channel channel part 19 the oil mist flows into the first d channel channel part 11 and passes and lubricates the roller bodies 12 and the roller tracks 13, 14, 15 and 16. A part of the lubricating oil deposits on the wall surfaces of the first ﬂ channel channel 11 and flows back into the container 17 with the rest of the lubricating oil remains in the circulating oil mist. Figure 3 shows another embodiment of a bearing device according to the invention, which differs from the embodiment shown in Figure 2 in that each row of roller bodies 12 is arranged to run partly in their respective roller tracks 27 and 27, respectively. 28, which are arranged in their respective inner bearing ring 29 resp. 30 connected to the inner ring 8, partly in their respective roller tracks 31 resp. 32, which years are arranged in each outer bearing ring 33 resp. 34 connected to the outer ring 9. in this embodiment, the sprocket 35 is formed as a separate part, which is connected to the inner ring 8 and at the same time as a spacer element between the two inner bearing rings 29 and 30. The two outer bearing rings 33 and 34 are axially held by a spacer ring 36. Otherwise, the embodiment according to ﬁ gur 3 corresponds to the embodiment according to ﬁ gur2.

I ﬁgur 4 visas en tredje utföringsform av en lageranordning, vilken skiljer sig mot den i ﬁgur 3 visade utföringsformen genom att rullkroppama de inre och yttre lagerringama ersatts av ett konventionellt sfäriskt rullager “ 37 med rullkroppar i form av två rader av rullar 38, vilka löper dels i rullbanor 39 och 40 i en inre lagerring 41, som är förbunden med innerringen 8, dels i en sfärisk rullbana 42 i en yttre lagerring 43, som är fast förbunden med en ytterring 9.Figure 4 shows a third embodiment of a bearing device, which differs from the embodiment shown in Figure 3 in that the roller bodies the inner and outer bearing rings are replaced by a conventional spherical roller bearing 37 with roller bodies in the form of two rows of rollers 38, which run partly in roller tracks 39 and 40 in an inner bearing ring 41, which is connected to the inner ring 8, partly in a spherical roller track 42 in an outer bearing ring 43, which is fixedly connected to an outer ring 9.

I samtliga utföringsformer av uppﬁnningen, som visasfi ﬁgurerna 1, 2, 3 och 4 är behàllarna 17 formad i en med den roterbara innerringen 8 förbunden del 18. En altemativ utföringsform visas i ﬁgur 5, i vilken behållaren 44 är formad i en icke roterbar del 45, som är förbunden med ytterringen 9 och att nämnda medel för att under drift bilda en oljedimma innehållande smörjoljedroppar innefattar en roterbar dimalstrande del 46, vilken är förbunden med innerringen 8 och sträcker sig ned i en del av behållaren 44, som under drift innehåller smörjolja. 10 15 20 25 30 526 4-717 Under driﬁ av denna lageranordning rör den roterande dimalstrande delen 46 upp smörjoljedroppar ur den icke roterande behållaren 44, vilka medbringas i ﬂödet av oljedimman i cirkulationskretsen. I övrigt fungerar lageranordningen enligt denna utföringsform på samma sätt som den i ﬁgur 2 visade utföringsformen av uppﬁnningen.In all embodiments of the invention, as shown in Figures 1, 2, 3 and 4, the containers 17 are formed in a part 18 connected to the rotatable inner ring 8. An alternative embodiment is shown in Figure 5, in which the container 44 is formed in a non-rotatable part. 45, which is connected to the outer ring 9 and that said means for forming an oil mist containing lubricating oil droplets during operation comprises a rotatable dimal generating part 46, which is connected to the inner ring 8 and extends into a part of the container 44, which during operation contains lubricating oil. . During operation of this bearing device, the rotating dimal generating member 46 moves lubricating oil droplets out of the non-rotating container 44, which are entrained in the av by the oil mist in the circulation circuit. Otherwise, the bearing device according to this embodiment functions in the same way as the embodiment of the invention shown in Figure 2.

Mängden olja i oljedimman skall vara väl avpassad till smörjbehovet. Den skall inte vara för stor då detta kan förorsaka skadlig uppvärmning av lageranordningen. Även ﬂödet av oljedimman, som ﬂäkthjulet åstadkommer i kontakt med smörjoljan i behållaren 17 eller 44, kan i vissa fall vara tillräckligt för att bilda en oljedimma, som innehåller tillräckligt mycket olja.The amount of oil in the oil mist must be well adapted to the need for lubrication. It should not be too large as this may cause harmful heating of the storage device. Even the fate of the oil mist caused by the sprocket in contact with the lubricating oil in the container 17 or 44 may in some cases be sufficient to form an oil mist which contains sufficient oil.

För att säkerställa att olja snabbt vid start når rullkropparna kan innerringen 8 vara försedd med en mindre extra behållare belägen i cirkulationskretsen uppströms om rullkropparna (ovanför i de visade I utföringsformema). Denna extra behållare ansamlar en mindre mängd smörjolja när axeln stannar och tömmer vid start med hjälp av centrifugalkraften ut smörjoljan i cirkulationskretsen.To ensure that oil reaches the roller bodies quickly at start-up, the inner ring 8 can be provided with a smaller extra container located in the circulation circuit upstream of the roller bodies (above in the embodiments shown). This extra container accumulates a small amount of lubricating oil when the shaft stops and empties out of the lubricating oil in the circulation circuit by means of the centrifugal force.

Genom att på detta sätt använda en lageranordning enligt den föreliggan- de uppﬁnningen för att roterbart uppbära en rotor i en centrifugalsepara- tor elimineras behovet av något smörjsystem utanför lageranordningama.By using a bearing device according to the present invention in this way to rotatably support a rotor in a centrifugal separator, the need for a lubrication system outside the bearing devices is eliminated.

Smörjningen av lageranordningen ombesörjs tillförlitligt istället internt i den enkla och kompakta lageranordningens slutna lagerenhet, som är avtätad mot omgivningen, utan onödig uppvärmning och förorening av smörjoljan.The lubrication of the bearing device is reliably provided instead internally in the closed and compact bearing unit of the simple and compact bearing device, which is sealed to the environment, without unnecessary heating and contamination of the lubricating oil.

I det visade utföringsexemplet har centrifugalseparatorn en remdrivenw rotor, men den kan naturligtvis även vara motordriven via skruwäxel eller (fl I J C;\ -Cä CN *J 10 vara direktdriven. Rotor behöver inte vara roterbar kring en vertikal axel utan kan även vara roterbar kring en horisontell axel, såsom i en dekanter.In the embodiment shown, the centrifugal separator has a belt-driven rotor, but it can of course also be motor-driven via a screw gear or be directly driven. The rotor need not be rotatable about a vertical axis but may also be rotatable about a horizontal axis, such as in a decanter.

Claims

10 15 20 25 30 526 437 11 Patent claims

A bearing device for bearing a shaft (2), which is rotatable about an axis of rotation (x) in a frame (3), the bearing device (4, 7) comprising a rotatable inner ring (8) connected to the shaft (2) and a non-rotatable outer ring (9) connected to the frame (3) and at least one row of roller bodies (12, 38), which are arranged in a space (11) formed in the bearing device (4, 7) between the rotatable inner ring (8) and the non-rotatable outer ring (9), and during operation the row of roller bodies (12, 38) is arranged to run in a first roller track (13, 14, 27, 28, 39, 40), which is arranged one with the shaft rotatable inner ring (8) connected part (8, 29, 30, 41) of the bearing device (4, 7), and partly in a second roller track (15, 16, 31, 32, 42), which is arranged in one with the non-rotating rotatable outer ring (9) connected part (9, 33, 34, 43) of the bearing device (4, 7), which bearing device (4, 7) also comprises a container (17, 44) for lubricating oil and means (21, 46) for to form an oil mist lubricating oil from this container (17, 44) and means (20, 35) for passing the oil mist past and in lubricating contact with the roller bodies (12, 38) and the roller tracks (13, 14, 15, 16, 27, 28, 31, 32, 39, 40, 42), characterized in that the rotatable inner ring (8) is sealed to the non-rotatable outer ring (9) by means of seals (10) and together with the non-rotatable outer ring (9) forms a closed bearing unit , in which the roller bodies (12, 38), the first and the second roller conveyor (13, 14, 27, 28, 39, 40 and 15, 16, 31, 32,42), bell bellaren (11, 44) fbr emdrlelja, said means (21, 46) fdr all during operation form an oil mist containing lubricating oil droplets from this container, means (20, 35) fdr all bring eljedlmman 30 15 52 25 30, 526 457 12 to flow axially past and in lubricating contact with the roller bodies (12, 38) and the roller tracks (13, 14, 15, 16, 27, 28, 31, 32, 39, 40, 42) are and - that the space (11) in which the roller bodies (12, 38) are arranged forms a first fate channel part (11), which extends axially from one side of the roller bodies (12, 38) axially past the roller bodies (12). , 38) to the axially opposite side of the roller bodies (12, 38), and which together with a second ﬂ channel channel part (19), which is formed in the outer ring (9) and is connected to the first ﬂ channel channel part (11) at both axial sides about the roller bodies (12, 38), an 'circulating ulations circuit of oil forms during operation, which circulating ﬂ circuit communicates with the interior of the container (17, 44) for r lubricating oil.

A bearing device according to claim 1, characterized in that the axis of rotation (x) is substantially vertically oriented.

A bearing device according to claim 2, characterized in that the container (17, 44) for lubricating oil is located below the roller bodies (12, 38).

A bearing device according to any one of the preceding claims, characterized in that said means for causing the oil mist to flow past and in lubricating contact with the roller bodies (12, 38) and the roller tracks (13, 14, 15, 16, 27 , 28, 31, 32, 39, 40, 42) comprises a sprocket (20, 35) arranged in the space (11) and co-rotating with the inner ring.

A bearing device according to claim 4, characterized in that the container (17) is formed in a rotatable part (18), which is connected to the inner ring 10 "! FJ O \ 4> f» l "<3 13 (8), and which part also forms an oil line element (21), which constitutes said means for forming during operation an oil mist containing lubricating oil droplets, and which has an oil line surface (22) extending from an oil-filled part of the container ( 17) -to a part of the circulation circuit, the oil line element having an edge (23) which is located adjacent to the circulation circuit, and to which edge (23) the oil line surface (22) extends and conducts lubricating oil under the influence of the centrifugal force, and from which edge ( 23) lubricating oil droplets depart and are carried in the oil mist flowing in the circulation circuit.

A bearing device according to claim 4, characterized in that the container (44) is formed in a non-rotatable part (45), which is connected to the outer ring (9) and that said means for forming an oil mist containing lubricating oil droplets during operation comprises a rotatable dimal-forming part (46), which is connected to the inner ring (8) and extends down into a part of the container (44), which during operation contains lubricating oil.

A bearing device according to any one of the preceding claims, characterized in that the first roller conveyor (13, 14) is arranged in a part of the inner ring (8) and the second roller conveyor (15, 16) is arranged in a part of the outer ring (9).

A bearing device according to any one of claims 1 to 5, characterized in that the first roller conveyor (27, 28) is arranged in an inner bearing ring (29, 30) connected to the inner ring (8) and the second roller conveyor (31, 32). ) is arranged in an outer bearing ring (33, 34) connected to the outer ring (9). 10 15 20 25 30 526 437 14

A storage device according to any one of the preceding claims, characterized in that the storage device is provided with channels (26) for a refrigerant.

Use of a bearing device according to any one of the preceding claims, characterized in that the bearing device (4, 7) is arranged to rotatably support a rotor (1) in a centrifugal separator.

A method of supporting a rotor (1) of a centrifugal separator rotatably about an axis of rotation (x) on an axis (2), which is mounted in a frame (3) via a bearing device (4, 7) comprising an inner ring (8), which is connected to the shaft (2) and an outer ring (9), which is connected to the frame (3) and at least a row of roller bodies (12, 38), which are arranged in a space (11) formed in the bearing device (4, 7) between the rotatable inner ring (8) and the non-rotatable outer ring (9) and during operation run partly in a first roller track (13, 14, 27, 28, 39, 40), which is arranged in a rotatable manner connected to the inner ring (8) connected to the shaft. part (8, 29, 30, 41) of the bearing device (4, 7), and partly in a second roller conveyor (15, 16, 31, 32, 42), which is arranged in a non-rotatable part connected to the outer ring (9). (9, 33, 34, 43) of the bearing device (4, 7), whereby lubricating oil from a container (17, 44) in the bearing device (4, 7) is caused to form an oil mist, which is caused to flow axially past and lubricate the roller bodies (12, 38) and the roller tracks (13, 14, 15, 16, 27, 28, 31, 32, 39, 40, 42), characterized in that the rotating inner ring (8) is sealed against the non-rotating outer ring (9) by means of seals (1 1 ) and together with the non-rotating outer ring (9) form a closed bearing unit, in which the roller bodies' (12, 38), the first and the second roller conveyor (13, 14, 27, 28, 39, 40 and 39, respectively . 15, 16, 31, 32, 42), the container (17, 44) for lubricating oil is arranged and in which an oil mist is formed during operation containing lubricating oil droplets from this container (17, 44) and the formed oil mist is caused to flow axially past and in lubricate the roller bodies (12, 38) and the roller tracks (13, 14, 15, 16, 27, 28, 31, 32, 39, 40, 42), causing the oil mist to flow during operation in a circulation circuit which communicates with the container (17 , 44) for lubricating oil, and which is formed partly by a first ﬂ channel channel part (11), which is constituted by the space (11) in which the roller bodies (12, 38) are arranged, and extends axially from one side of the roller bodies ( 12, 38) axially past the roller bodies (12, 38) to the axially opposite side of the roller bodies (12, 38), and partly of a second ﬂ channel channel part (19), which is formed in the outer ring (9) and is connected to the first ﬂ channel channel part (11) at both axial sides of the roller bodies (12, 38).

A method according to claim 11, characterized in that the axis of rotation (x) is oriented substantially vertically with the container (17, 44) for lubricating oil located below the roller bodies (12, 38).

A method according to any one of claims 11 or 12, characterized in that the oil mist is caused to flow past and in lubricating contact with the roller bodies (12, 38) and the roller tracks (13, 14, 15, 16, 27, 28, 31, 32, 39, 40, 42) by means of a gear wheel (20, 35) arranged in the space (11) and co-rotating with the inner ring (8).

A method according to any one of claims 11 - 13, characterized in that the storage device is cooled by means of a cooling medium, which is caused to flow in cooling channels (26) formed in the storage device.