EP2772652B1 - Partition for sealing the rear section of a radial compressor - Google Patents

Partition for sealing the rear section of a radial compressor Download PDF

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Publication number
EP2772652B1
EP2772652B1 EP14155860.1A EP14155860A EP2772652B1 EP 2772652 B1 EP2772652 B1 EP 2772652B1 EP 14155860 A EP14155860 A EP 14155860A EP 2772652 B1 EP2772652 B1 EP 2772652B1
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EP
European Patent Office
Prior art keywords
intermediate wall
bearing housing
sealing
fastening
bores
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.)
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Application number
EP14155860.1A
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German (de)
French (fr)
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EP2772652A2 (en
EP2772652A3 (en
Inventor
Andrea Vacca
Matthias Jarusel
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.)
Turbo Systems Switzerland Ltd
Original Assignee
ABB Schweiz AG
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Publication date
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Publication of EP2772652A2 publication Critical patent/EP2772652A2/en
Publication of EP2772652A3 publication Critical patent/EP2772652A3/en
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Publication of EP2772652B1 publication Critical patent/EP2772652B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/04—Blade-carrying members, e.g. rotors for radial-flow machines or engines
    • F01D5/043—Blade-carrying members, e.g. rotors for radial-flow machines or engines of the axial inlet- radial outlet, or vice versa, type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage
    • F05D2260/6022—Drainage of leakage having past a seal

Definitions

  • the invention relates to the field of exhaust gas turbochargers for supercharged internal combustion engines.
  • It relates to an intermediate wall for sealing the rear space of the compressor wheel of a radial compressor with respect to a storage space enclosed by a bearing housing, a bearing device for mounting the rotor of a compressor with such an intermediate wall, a radial compressor with such a bearing device and an exhaust gas turbocharger with such a radial compressor.
  • Exhaust gas turbochargers are used to increase the performance of internal combustion engines.
  • the exhaust gas from the internal combustion engine is applied to the exhaust gas turbine of the exhaust gas turbocharger and its kinetic energy is used to suck in and compress air for the internal combustion engine.
  • the impellers of the turbine and the compressor are connected to one another via a shaft mounted in a bearing housing.
  • sealing air is often used on the turbine side in order to protect the bearing area from penetrating hot exhaust gases from the flow channel or to actively cool the turbine wheel.
  • This sealing air can be supplied externally or taken from the air flow downstream of the compressor.
  • sealing air can also be discharged from the back space of the compressor wheel, which has the positive effect of relieving the axial load on the compressor wheel, since the pressure in the back space of the compressor wheel is reduced by discharging the sealing air.
  • the air in the back space of the compressor wheel penetrates from the flow channel of the compressor wheel into this area, since the space between the rapidly rotating compressor wheel, which is subject to greater temperature fluctuations, cannot be sealed as well as desired.
  • the sealing air discharged in this way is guided through several components to the turbine side. This creates housing transitions which have to be sealed against the escape of the sealing air.
  • the at least one barrier air transition between the partition wall immediately adjacent to the compressor wheel pressure chamber and the bearing housing has so far been implemented by means of a round pin, which was attached to the partition wall and received in a corresponding opening in the bearing housing.
  • the at least one pin on the otherwise essentially rotationally symmetrical intermediate wall was produced by the complex machining process of circular milling.
  • the pamphlet DE 10 20009 034 962 B3 relates to a centrifugal compressor with a bearing housing having an interior space, a compressor shaft rotatably guided through the bearing housing and carrying a compressor impeller, and a housing cover which is fitted together on one impeller side of the bearing housing so that it at least partially closes the interior space, the bearing housing being one to has a radial extension corresponding to a diameter direction of the compressor shaft and a certain axial extension corresponding to a longitudinal direction of the compressor shaft and has a recess on an inside facing the interior of the bearing housing which, together with part of the interior, is fluidly connected to a cooling fluid inlet and a cooling fluid outlet of the bearing housing Forms cooling fluid passage, in which at least one rib is provided which does not interrupt a cooling fluid flow through the
  • the pamphlet DE 10 2006 048 784 A1 relates to a compressor, in particular a radial compressor, for a turbocharger comprising a compressor wheel which is rotatably accommodated in a compressor housing, a part of the compressor housing adjacent to the compressor wheel being flowed through by a cooling fluid.
  • the compressor wheel is at least partially provided with a coating that reduces the introduction of heat.
  • the pamphlet DE 10 2009 024 679 A1 relates to a compressor impeller and radial compressor equipped therewith, the compressor impeller having an impeller hub with a first side and a second side facing away from the first side and a plurality of impeller blades which are distributed along a circumferential direction of the impeller hub and which are arranged on the first side of the impeller hub Define a plurality of impeller passages for passing a compression fluid therethrough.
  • the impeller passages have a radially inner compression fluid inlet end and a radially outer compression fluid outlet end.
  • centrifugal flow blocking means are provided which are designed to stop a radially outward flow of liquid cooling medium applied to the second side.
  • the object of the invention is to provide a bearing device for bearing a rotor of a compressor, with which a sealing air discharge can be provided which can be produced in a simple manner.
  • the bearing device comprises a bearing housing which encloses a storage space with a central opening for receiving the rotor.
  • the storage device comprises an intermediate wall for sealing a rear space of a compressor wheel of the compressor with respect to the storage space, the intermediate wall comprising a rotationally symmetrical, disk-shaped base body with a central opening for passing through the rotor, with means being provided in the area of the central opening for a transition to seal the rotor.
  • the intermediate wall comprises a circumferential, rotationally symmetrically shaped fastening flange which is provided for fastening the intermediate wall to the bearing housing and which has a planar contact surface for resting on a contact surface of the bearing housing.
  • the bores include at least one sealing air duct and a plurality of bores distributed in the circumferential direction on the virtual circular line for receiving fastening means.
  • the bearing housing comprises a circumferential fastening flange which is provided for fastening the partition to the bearing housing and which has a planar contact surface for resting on the contact surface of the fastening flange of the partition.
  • Several bores are embedded on a virtual circular line in the fastening flange of the bearing housing, the bores comprising at least one sealing air channel and several bores distributed in the circumferential direction on the virtual circular line for receiving fastening means.
  • the multiple bores of the mounting flange of the bearing housing correspond to the multiple bores of the mounting flange of the partition, so that the at least one air barrier channel of the mounting flange of the bearing housing forms an axial continuation of the at least one air barrier channel of the partition.
  • the bores are arranged in the fastening flange of the intermediate wall for receiving fastening means.
  • the at least one sealing air duct of the fastening flange of the partition is arranged between two adjacent bores of the fastening flange of the partition for receiving fastening means.
  • Fig. 1 shows an exhaust gas turbocharger according to the prior art with an exhaust gas turbine 10 through which there is axial flow and a radial compressor 70.
  • the rotor is rotatably mounted in the bearing housing 30.
  • the exhaust gas coming from the combustion chambers of an internal combustion engine is guided through the gas inlet housing 12 onto the rotor blades of the turbine wheel 11.
  • the exhaust gas is then collected in the diffuser area of the gas outlet housing 13 and discharged via the exhaust system.
  • the compressor wheel which is driven by the turbine via the shaft, sucks in fresh air in order to compress it and feed it to the combustion chambers of the internal combustion engine under higher pressure.
  • sealing air is often used on the turbine side in order to protect the bearing area from penetrating hot exhaust gas or to cool the turbine wheel hub.
  • This sealing air is usually a by-product of the compressor wheel thrust relief, in which the air pressure in the rear space of the compressor wheel is reduced in that the air penetrating into this area from the flow channel of the compressor wheel is removed.
  • Fig. 2 shows a section taken along the shaft axis through the radial compressor of an exhaust gas turbocharger.
  • the compressor wheel 71 is arranged in the compressor housing 72.
  • the compressor wheel includes a hub body and a plurality of rotor blades.
  • the rear space is delimited by a disk-shaped partition 40.
  • the partition has a central opening in the interior through which the shaft 20 is guided. Depending on the way in which the compressor wheel is fastened on the shaft, a part of the compressor wheel 71 can also protrude into or through the central opening in the partition wall. A sealing point effective in two directions is provided in the radially inner area between the rotor and the partition. On the one hand, the aim is to prevent too much fresh air from escaping from the rear of the compressor wheel into the bearing area under ambient pressure (blow-by). On the other hand, it is to be prevented that at certain operating points of the compressor with reversed pressure conditions, oil or oil-laden air can get from the bearing area into the rear space of the compressor wheel.
  • the partition is attached to the bearing housing in the radially outer area and the transition is also secured with a seal 35.
  • the disk-shaped intermediate wall 40 On the side facing the bearing area, the disk-shaped intermediate wall 40 has a circumferential fastening flange 41 which, according to the invention, is provided for resting on a likewise circumferential fastening flange 31 of the bearing housing. Between the intermediate wall 40 and the bearing housing 30 there is a cavity 36, radially outside the circumferential flange, which can be used to cool the housing area at the outer edge or at the outlet of the compressor wheel. For example, a cooling medium (water or cool air) can be passed through the cavity.
  • a cooling medium water or cool air
  • the partition wall in the area of the fastening flange 41, there are several through openings, each of which either acts as a sealing air duct 42 for the discharge of sealing air from the rear space of the compressor wheel ( Fig. 2 , upper half), or as a hole 43 for receiving fasteners 50 ( Fig. 2 , lower half).
  • the flange 31 of the bearing housing holes corresponding to the openings in the intermediate wall are provided.
  • the bearing surfaces of the two flanges are designed as axial end faces and run in a plane perpendicular to the axis.
  • the bearing surfaces can also be aligned slightly conically, the bearing surfaces of the two flanges running strictly parallel to one another.
  • a sealing point 34 is located radially inside the openings arranged on a circle, advantageously designed as one or two grooves with an inserted sealing ring.
  • the groove can be embedded in the bearing surface of the flange 41 of the partition wall on one side, or - as in the embodiment shown - in the bearing surface of the flange 31 on the bearing housing, or on both sides in both bearing surfaces.
  • the sealing ring a conventional O-ring, is squeezed into the groove in the axial direction when the partition is placed on the bearing housing and thus seals between the two opposite bearing surfaces.
  • the sealing air duct is sealed off from the storage area so that no blow-by flow escapes into the storage area.
  • the fastening means are also sealed according to the invention, so that at the above-mentioned operating point with reversed pressure conditions, no oil or oil-laden air can get from the bearing area into the rear space of the compressor wheel.
  • the multiple bores for receiving fastening means 43 there are at least one sealing air duct 42 and the multiple bores for receiving fastening means 43 according to the invention at the same radial height, that is, they are on a circle concentric to the circular, disk-shaped partition.
  • the bores for receiving the fastening means can have the same diameter as the bore of the sealing air duct for receiving a screw head, except for a residual depth with a smaller diameter. This facilitates the manufacture of the partition wall.
  • the arrangement of the two types of bores can be regular or irregular.
  • the fastening means 50 are advantageously distributed regularly along the circumference.
  • the at least one sealing air duct 42 can take place as shown a fastening opening, or additionally between two fastening openings arranged at regular intervals.
  • FIG. 11 shows a view in the axial direction of the partition 40 in the FIG Fig. 2 indicated section, along III-III, through the rear area of the centrifugal compressor.
  • the depressions of the labyrinth seal 44 are indicated with several concentric circles.
  • the shaft 20 and the cylindrical extension of the compressor wheel surrounding the shaft are shown.
  • the continuation of the at least one sealing air channel 32 and the bores for receiving fastening means 33 are also at the same radial height, that is, they are also on a circle concentric to the shaft axis.
  • Fig. 4 shows partition and bearing housing along the in Fig. 2 indicated, along IV-IV section through the rear area of the centrifugal compressor Fig. 2 .
  • the bearing housing 30 is cut in the radially outer area.
  • the section then leads through the cavity 36 enclosed between the intermediate wall and the bearing housing, which can optionally be used to cool the housing area at the compressor wheel outlet.
  • the cavity 36 is delimited by the flange 31, in which, according to the invention, the bores 33 and at least one sealing air channel 32 are arranged.
  • the sealing point 34 can also be seen, which in the region of the flange 31, however, runs radially within the sealing air channel 32 and bores 33.
  • the shaft 20 In the radially innermost area, the shaft 20, the extension of the compressor wheel 71 and a piece of the intermediate wall 40 inclined towards the bearing side in this area are indicated.
  • the partition 40 is, according to the invention, a rotationally symmetrical disk which can be brought into its final shape during manufacture by turning and without milling. Only a drill is required for the sealing air duct, which can also be used to drill the holes to accommodate the fastening means. As a result, the manufacturing process can be simplified compared to a conventional partition wall.
  • the partition has an additional positioning bore, which is provided for receiving a positioning pin, which is located on the bearing housing is attached or is introduced into a positioning hole provided for this purpose in the bearing housing before assembly.
  • a positioning pin which is located on the bearing housing is attached or is introduced into a positioning hole provided for this purpose in the bearing housing before assembly.
  • the positioning can be realized by an irregular distribution of the bores for receiving the fastening means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Supercharger (AREA)

Description

TECHNISCHES GEBIETTECHNICAL AREA

Die Erfindung bezieht sich auf das Gebiet der Abgasturbolader von aufgeladenen Brennkraftmaschinen.The invention relates to the field of exhaust gas turbochargers for supercharged internal combustion engines.

Sie betrifft eine Zwischenwand zur Abdichtung des Rückraums des Verdichterrades eines Radialverdichters bezüglich eines von einem Lagergehäuse umschlossenen Lagerraums, eine Lagervorrichtung zum Lagern des Rotors eines Verdichters mit einer derartigen Zwischenwand, einen Radialverdichter mit einer derartigen Lagervorrichtung sowie ein Abgasturbolader mit einem derartigen Radialverdichter.It relates to an intermediate wall for sealing the rear space of the compressor wheel of a radial compressor with respect to a storage space enclosed by a bearing housing, a bearing device for mounting the rotor of a compressor with such an intermediate wall, a radial compressor with such a bearing device and an exhaust gas turbocharger with such a radial compressor.

STAND DER TECHNIKSTATE OF THE ART

Abgasturbolader werden zur Leistungssteigerung von Brennkraftmaschinen eingesetzt. Dabei wird die Abgasturbine des Abgasturboladers mit den Abgasen der Brennkraftmaschine beaufschlagt und deren kinetische Energie zum Ansaugen und Verdichten von Luft für die Brennkraftmaschine verwendet. Die Laufräder der Turbine und des Verdichters sind über eine in einem Lagergehäuse gelagerte Welle miteinander verbunden.Exhaust gas turbochargers are used to increase the performance of internal combustion engines. The exhaust gas from the internal combustion engine is applied to the exhaust gas turbine of the exhaust gas turbocharger and its kinetic energy is used to suck in and compress air for the internal combustion engine. The impellers of the turbine and the compressor are connected to one another via a shaft mounted in a bearing housing.

Bei Abgasturboladern mit Axialturbinen wird auf der Turbinenseite häufig Sperrluft eingesetzt, um den Lagerbereich vor eindringendem heissen Abgasen aus dem Strömungskanal zu schützen oder um das Turbinenrad aktive zu kühlen. Diese Sperrluft kann extern zugeführt werden oder aus dem Luftstrom stromabwärts des Verdichters entnommen werden. Alternativ lässt sich Sperrluft auch aus dem Rückraum des Verdichterrades abführen, was den positiven Effekt einer Entlastung der axialen Belastung des Verdichterrades mit sich bringt, da sich durch das Abführen der Sperrluft der Druck im Rückraum des Verdichterrades verringert. Die Luft im Rückraum des Verdichterrades dringt aus dem Strömungskanal des Verdichterrades in diesen Bereich vor, da sich der Zwischenraum zwischen dem schnell drehenden und grösseren Temperaturschwankungen ausgesetzten Verdichterrad nicht beliebig gut abdichten lässt.In exhaust gas turbochargers with axial turbines, sealing air is often used on the turbine side in order to protect the bearing area from penetrating hot exhaust gases from the flow channel or to actively cool the turbine wheel. This sealing air can be supplied externally or taken from the air flow downstream of the compressor. Alternatively, sealing air can also be discharged from the back space of the compressor wheel, which has the positive effect of relieving the axial load on the compressor wheel, since the pressure in the back space of the compressor wheel is reduced by discharging the sealing air. The air in the back space of the compressor wheel penetrates from the flow channel of the compressor wheel into this area, since the space between the rapidly rotating compressor wheel, which is subject to greater temperature fluctuations, cannot be sealed as well as desired.

Die auf diese Weise abgeführte Sperrluft wird durch mehrere Bauteile bis zur Turbinenseite geführt. Dadurch entstehen Gehäuseübergänge, welche gegen Austritt der Sperrluft abgedichtet werden müssen. Der mindestens eine Sperrluft-Übergang zwischen der unmittelbar an den Verdichterradrückraum angrenzenden Zwischenwand und dem Lagergehäuse wurde bislang mittels jeweils eines runden Zapfens realisiert, welcher an der Zwischenwand abgebracht war und in einer entsprechenden Öffnung im Lagergehäuse aufgenommen wurde. Der mindestens eine Zapfen an der ansonsten im wesentlichen rotationssymmetrisch ausgebildeten Zwischenwand wurde durch das aufwändige Bearbeitungsverfahren Zirkularfräsen hergestellt.The sealing air discharged in this way is guided through several components to the turbine side. This creates housing transitions which have to be sealed against the escape of the sealing air. The at least one barrier air transition between the partition wall immediately adjacent to the compressor wheel pressure chamber and the bearing housing has so far been implemented by means of a round pin, which was attached to the partition wall and received in a corresponding opening in the bearing housing. The at least one pin on the otherwise essentially rotationally symmetrical intermediate wall was produced by the complex machining process of circular milling.

Bezüglich des Standes der Technik wird beispielhaft auf die Druckschriften DE 10 20009 034 962 B3 , DE 10 2006 048 784 A1 , und DE 10 2009 024 679 A1 verwiesen. Die Druckschrift DE 10 20009 034 962 B3 betrifft einen Radialverdichter mit einem einen Innenraum aufweisenden Lagergehäuse, einer drehbar durch das Lagergehäuse hindurchgeführten ein Verdichterlaufrad tragenden Verdichterwelle, und einem Gehäusedeckel, der auf einer Laufradseite des Lagergehäuses mit diesem zusammengepasst ist, so dass dieser den Innenraum zumindest teilweise verschließt, wobei das Lagergehäuse eine zu einer Durchmesserrichtung der Verdichterwelle korrespondierende radiale Erstreckung und eine bestimmte zu einer Längsrichtung der Verdichterwelle korrespondierende axiale Erstreckung hat und auf einer dem Innenraum des Lagergehäuses zugewandten Innenseite dessen eine Aussparung hat, die gemeinsam mit einem Teil des Innenraums eine mit einem Kühlfluideinlass und einem Kühlfluidauslass des Lagergehäuses fluidverbundene Kühlfluidpassage bildet, in der wenigstens eine einen Kühlfluidfluss durch die Kühlfluidpassage nicht unterbrechende Rippe vorgesehen ist, die eine axiale Weite der Kühlfluidpassage von einem laufradseitigen zu einem innenraumseitigen Wandabschnitt der Kühlfluidpassage hin überbrückt, so dass die Kühlfluidpassage im Bereich der Rippe eine Querschnittsreduzierung aufweist, wobei der laufradseitige Wandabschnitt über die Rippe zugkraftübertragend mit dem innenraumseitigen Wandabschnitt verbunden ist. Die Druckschrift DE 10 2006 048 784 A1 betrifft einen Verdichter, insbesondere ein Radialverdichter, für einen Turbolader umfassend ein Verdichterrad, das drehbar in einem Verdichtergehäuse aufgenommen ist, wobei ein dem Verdichterrad benachbarter Teil des Verdichtergehäuses von einem Kühlfluid durchströmt wird. Das Verdichterrad ist wenigstens teilweise mit einer wärmeeintragverringernden Beschichtung versehen. Die Druckschrift DE 10 2009 024 679 A1 betrifft ein Verdichterlaufrad und damit ausgerüsteter Radialverdichter, wobei das Verdichterlaufrad eine Laufradnabe mit einer ersten Seite und einer der ersten Seite abgewandten zweiten Seite und eine Mehrzahl von Laufradschaufeln aufweist, die entlang einer Umfangsrichtung der Laufradnabe verteilt auf der ersten Seite der Laufradnabe angeordnet sind und die eine Mehrzahl von Laufradpassagen zum Hindurchleiten eines Verdichtungsfluids definieren. Die Laufradpassagen weisen ein radial innenliegendes Verdichtungsfluid-Eintrittsende und ein radial außenliegendes Verdichtungsfluid-Austrittsende auf. An einem zum Verdichtungsfluid-Aus- trittsende radial korrespondierenden Abschnitt der zweiten Seite der Laufradnabe sind Fliehkraftfluss-Sperrmittel vorgesehen, welche eingerichtet sind, einen radial auswärts gerichteten Fluss von auf die zweite Seite aufgebrachtem flüssigem Kühlmedium zu stoppen.With regard to the state of the art, reference is made to the publications by way of example DE 10 20009 034 962 B3 , DE 10 2006 048 784 A1 , and DE 10 2009 024 679 A1 referenced. The pamphlet DE 10 20009 034 962 B3 relates to a centrifugal compressor with a bearing housing having an interior space, a compressor shaft rotatably guided through the bearing housing and carrying a compressor impeller, and a housing cover which is fitted together on one impeller side of the bearing housing so that it at least partially closes the interior space, the bearing housing being one to has a radial extension corresponding to a diameter direction of the compressor shaft and a certain axial extension corresponding to a longitudinal direction of the compressor shaft and has a recess on an inside facing the interior of the bearing housing which, together with part of the interior, is fluidly connected to a cooling fluid inlet and a cooling fluid outlet of the bearing housing Forms cooling fluid passage, in which at least one rib is provided which does not interrupt a cooling fluid flow through the cooling fluid passage and which has an axial width of the cooling fluid passage of a tepid The wheel-side is bridged to an interior-side wall section of the cooling fluid passage so that the cooling-fluid passage has a cross-sectional reduction in the region of the rib, the impeller-side wall section being connected to the interior-side wall section in a tensile force-transmitting manner via the rib. The pamphlet DE 10 2006 048 784 A1 relates to a compressor, in particular a radial compressor, for a turbocharger comprising a compressor wheel which is rotatably accommodated in a compressor housing, a part of the compressor housing adjacent to the compressor wheel being flowed through by a cooling fluid. The compressor wheel is at least partially provided with a coating that reduces the introduction of heat. The pamphlet DE 10 2009 024 679 A1 relates to a compressor impeller and radial compressor equipped therewith, the compressor impeller having an impeller hub with a first side and a second side facing away from the first side and a plurality of impeller blades which are distributed along a circumferential direction of the impeller hub and which are arranged on the first side of the impeller hub Define a plurality of impeller passages for passing a compression fluid therethrough. The impeller passages have a radially inner compression fluid inlet end and a radially outer compression fluid outlet end. At a section of the second side of the impeller hub that corresponds radially to the compression fluid outlet end, centrifugal flow blocking means are provided which are designed to stop a radially outward flow of liquid cooling medium applied to the second side.

KURZE DARSTELLUNG DER ERFINDUNGSUMMARY OF THE INVENTION

Die Aufgabe der Erfindung besteht darin eine Lagervorrichtung zum Lagern eines Rotors eines Verdichters bereitzustellen, mit welcher eine Sperrluftabführung bereitgestellt werden kann, die auf einfache Weise herzustellen ist.The object of the invention is to provide a bearing device for bearing a rotor of a compressor, with which a sealing air discharge can be provided which can be produced in a simple manner.

Erfindungsgemäß umfasst die Lagervorrichtung ein Lagergehäuse, welches einen Lagerraum mit einer zentralen Öffnung zur Aufnahme des Rotors umschliesst. Zusätzlich umfasst die Lagervorrichtung eine Zwischenwand zur Abdichtung eines Rückraums eines Verdichterrades des Verdichters bezüglich des Lagerraums, wobei die Zwischenwand einen rotationssymmetrischen, scheibenförmigen Grundkörper, mit einer zentralen Öffnung zum Durchführen des Rotors umfasst, wobei im Bereich der zentralen Öffnung Mittel vorgesehen sind, um einen Übergang zum Rotor abzudichten. Die Zwischenwand umfasst einen umlaufenden, rotationssymmetrisch geformten Befestigungsflansch, welcher zur Befestigung der Zwischenwand an dem Lagergehäuse vorgesehen ist und welcher eine plane Kontaktfläche zur Auflage auf einer Kontaktfläche des Lagergehäuses aufweist. In den Befestigungsflansch sind auf einer virtuellen Kreislinie mehrere Bohrungen eingelassen. Die Bohrungen umfassen mindestens einen Sperrluftkanal sowie mehrere, in Umfangsrichtung auf der virtuellen Kreislinie verteilt angeordnete Bohrungen zur Aufnahme von Befestigungsmitteln. Das Lagergehäuse umfasst einen umlaufenden Befestigungsflansch, welcher zur Befestigung der Zwischenwand an dem Lagergehäuse vorgesehen ist, und welcher eine plane Kontaktfläche zur Auflage auf der Kontaktfläche des Befestigungsflansches der Zwischenwand aufweist. In den Befestigungsflansch des Lagergehäuses sind auf einer virtuellen Kreislinie mehrere Bohrungen eingelassen, wobei die Bohrungen mindestens einen Sperrluftkanal sowie mehrere, in Umfangsrichtung auf der virtuellen Kreislinie verteilt angeordnete Bohrungen zur Aufnahme von Befestigungsmitteln umfassen. Die mehreren Bohrungen des Befestigungsflansches des Lagergehäuses korrespondieren mit den mehreren Bohrungen des Befestigungsflansches der Zwischenwand, so dass der mindestens eine Sperrluftkanal des Befestigungsflansches des Lagergehäuses eine axiale Fortsetzung des mindestens einen Sperrluftkanals der Zwischenwand bildet. Die Bohrungen sind zur Aufnahme von Befestigungsmitteln im Befestigungsflansch der Zwischenwand angeordnet. Der mindestens eine Sperrluftkanal des Befestigungsflansches der Zwischenwand ist jeweils zwischen zwei benachbart angeordneten Bohrungen des Befestigungsflansches der Zwischenwand zur Aufnahme von Befestigungsmitteln angeordnet.According to the invention, the bearing device comprises a bearing housing which encloses a storage space with a central opening for receiving the rotor. In addition, the storage device comprises an intermediate wall for sealing a rear space of a compressor wheel of the compressor with respect to the storage space, the intermediate wall comprising a rotationally symmetrical, disk-shaped base body with a central opening for passing through the rotor, with means being provided in the area of the central opening for a transition to seal the rotor. The intermediate wall comprises a circumferential, rotationally symmetrically shaped fastening flange which is provided for fastening the intermediate wall to the bearing housing and which has a planar contact surface for resting on a contact surface of the bearing housing. Several holes are embedded in the mounting flange on a virtual circular line. The bores include at least one sealing air duct and a plurality of bores distributed in the circumferential direction on the virtual circular line for receiving fastening means. The bearing housing comprises a circumferential fastening flange which is provided for fastening the partition to the bearing housing and which has a planar contact surface for resting on the contact surface of the fastening flange of the partition. Several bores are embedded on a virtual circular line in the fastening flange of the bearing housing, the bores comprising at least one sealing air channel and several bores distributed in the circumferential direction on the virtual circular line for receiving fastening means. The multiple bores of the mounting flange of the bearing housing correspond to the multiple bores of the mounting flange of the partition, so that the at least one air barrier channel of the mounting flange of the bearing housing forms an axial continuation of the at least one air barrier channel of the partition. The bores are arranged in the fastening flange of the intermediate wall for receiving fastening means. The at least one sealing air duct of the fastening flange of the partition is arranged between two adjacent bores of the fastening flange of the partition for receiving fastening means.

Weitere Vorteile ergeben sich aus den abhängigen Ansprüchen.Further advantages result from the dependent claims.

KURZE BESCHREIBUNG DER ZEICHNUNGENBRIEF DESCRIPTION OF THE DRAWINGS

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert. Hierbei zeigt:

Fig1
eine isometrische Darstellung eines teilweise aufgeschnittenen Abgasturboladers gemäss dem Stand der Technik mit einem Radialverdichter und einer Axialturbine,
Fig. 2
einen entlang der Wellenachse geführten Schnitt durch den Radialverdichter eines Abgasturboladers nach Fig.1, mit einem im Rückraum des Verdichterrades zwischen Zwischenwand und Lagergehäuse erfindungsgemäss ausgestalteten Sperrluftübergang,
Fig. 3
einen im Zwischenraum zwischen Verdichterrad und Zwischenwand entlang III-III geführten Schnitt durch die Anordnung nach Fig. 2, und
Fig. 4
einen durch die Trennstelle zwischen Zwischenwand und Lagergehäuse entlang IV-IV geführten Schnitt durch die Anordnung nach Fig. 2.
The invention is explained in more detail below with reference to drawings. Here shows:
Fig1
an isometric view of a partially cut-open exhaust gas turbocharger according to the prior art with a radial compressor and an axial turbine,
Fig. 2
a section along the shaft axis through the radial compressor of an exhaust gas turbocharger Fig. 1 , with a sealing air transition designed according to the invention in the rear space of the compressor wheel between the partition wall and the bearing housing,
Fig. 3
a section through the arrangement shown in the space between the compressor wheel and the partition wall along III-III Fig. 2 , and
Fig. 4
a section through the arrangement taken through the separation point between the partition and the bearing housing along IV-IV Fig. 2 .

WEG ZUR AUSFÜHRUNG DER ERFINDUNGWAY TO CARRY OUT THE INVENTION

Fig. 1 zeigt einen Abgasturbolader gemäss dem Stand der Technik mit einer axial durchströmten Abgasturbine 10 sowie einem Radialverdichter 70. Der teilweise aufgeschnittene Abgasturbolader weist einen Rotor bestehend aus Turbinenrad 11, Verdichterrad 71 und dazwischenliegender Welle 20 auf. Der Rotor ist drehbar im Lagergehäuse 30 gelagert. Das aus den Brennkammern eines Verbrennungsmotors stammende Abgas wird durch das Gaseintrittsgehäuse 12 auf die Laufschaufeln des Turbinenrades 11 geführt. Anschliessend wird das Abgas im Diffusorbereich des Gasaustrittsgehäuses 13 gesammelt und über die Auspuffanlage abgeführt. Das durch die Turbine über die Welle angetriebene Verdichterrad saugt Frischluft an um diese zu verdichten und unter höherem Druck den Brennkammern des Verbrennungsmotors zuzuführen. Fig. 1 shows an exhaust gas turbocharger according to the prior art with an exhaust gas turbine 10 through which there is axial flow and a radial compressor 70. The rotor is rotatably mounted in the bearing housing 30. The exhaust gas coming from the combustion chambers of an internal combustion engine is guided through the gas inlet housing 12 onto the rotor blades of the turbine wheel 11. The exhaust gas is then collected in the diffuser area of the gas outlet housing 13 and discharged via the exhaust system. The compressor wheel, which is driven by the turbine via the shaft, sucks in fresh air in order to compress it and feed it to the combustion chambers of the internal combustion engine under higher pressure.

Bei derartigen Abgasturboladern mit Axialturbinen wird auf der Turbinenseite häufig Sperrluft eingesetzt, um den Lagerbereich vor eindringendem heissen Abgas zu schützen oder um die Turbinenradnabe zu kühlen. Diese Sperrluft ist meist ein Beiprodukt der Verdichterradschubentlastung, bei welcher der Luftdruck im Rückraum des Verdichterrades reduziert wird, indem die aus dem Strömungskanal des Verdichterrades in diesen Bereich eindringende Luft abgeführt wird.In such exhaust gas turbochargers with axial turbines, sealing air is often used on the turbine side in order to protect the bearing area from penetrating hot exhaust gas or to cool the turbine wheel hub. This sealing air is usually a by-product of the compressor wheel thrust relief, in which the air pressure in the rear space of the compressor wheel is reduced in that the air penetrating into this area from the flow channel of the compressor wheel is removed.

Fig. 2 zeigt einen entlang der Wellenachse geführten Schnitt durch den Radialverdichter eines Abgasturboladers. Das Verdichterrad 71 ist im Verdichtergehäuse 72 angeordnet. Das Verdichterrad umfasst einen Nabenkörper sowie eine Vielzahl von Laufschaufeln. Im Rückraum des Verdichterrades 71, also der dem Lagerbereich zugewandten Seite, befindet sich im radial äusseren Bereich des Verdichterrades eine Dichtung, welche in der Regel als Labyrinthdichtung ausgeführt ist. Diese Dichtung sorgt dafür, dass keine grössere Menge der unter erhöhtem Druck stehenden Frischluft aus dem Strömungskanal am Austritt des Verdichterrades in den Rückraum des Verdichterrades entweicht. Zum Lagergehäuse 30 hin ist der Rückraum durch eine scheibenförmige Zwischenwand 40 begrenzt. Die Zwischenwand weist im Innern eine zentrale Öffnung auf, durch die die Welle 20 geführt ist. Je nach Befestigungsweise des Verdichterrades auf der Welle kann auch ein Teil des Verdichterrades 71 in oder durch die zentrale Öffnung in der Zwischenwand hinein- oder hindurchragen. Zwischen dem Rotor und der Zwischenwand ist im radial inneren Bereich eine in zwei Richtungen wirksame Dichtstelle vorgesehen. Einerseits soll verhindert werden, dass zu viel Frischluft aus dem Rückraum des Verdichterrades in den unter Umgebungsdruck stehenden Lagerbereich entweicht (blow-by). Andererseits soll verhindert werden, dass bei gewissen Betriebspunkten des Verdichters bei umgekehrt gerichteten Druckverhältnissen Öl oder ölbehaftete Luft aus dem Lagerbereich in den Rückraum des Verdichterrades gelangen kann. Fig. 2 shows a section taken along the shaft axis through the radial compressor of an exhaust gas turbocharger. The compressor wheel 71 is arranged in the compressor housing 72. The compressor wheel includes a hub body and a plurality of rotor blades. In the rear space of the compressor wheel 71, that is to say on the side facing the bearing area, there is a seal in the radially outer region of the compressor wheel, which is usually designed as a labyrinth seal. This seal ensures that no larger amount of the fresh air under increased pressure escapes from the flow channel at the outlet of the compressor wheel into the rear space of the compressor wheel. Towards the bearing housing 30, the rear space is delimited by a disk-shaped partition 40. The partition has a central opening in the interior through which the shaft 20 is guided. Depending on the way in which the compressor wheel is fastened on the shaft, a part of the compressor wheel 71 can also protrude into or through the central opening in the partition wall. A sealing point effective in two directions is provided in the radially inner area between the rotor and the partition. On the one hand, the aim is to prevent too much fresh air from escaping from the rear of the compressor wheel into the bearing area under ambient pressure (blow-by). On the other hand, it is to be prevented that at certain operating points of the compressor with reversed pressure conditions, oil or oil-laden air can get from the bearing area into the rear space of the compressor wheel.

Die Zwischenwand ist im radial äusseren Bereich am Lagergehäuse befestigt und der Übergang ist ebenfalls mit einer Dichtung 35 gesichert.The partition is attached to the bearing housing in the radially outer area and the transition is also secured with a seal 35.

Die scheibenförmige Zwischenwand 40 weist auf der dem Lagerbereich zugewandten Seite einen umlaufenden Befestigungsflansch 41 auf, welcher erfindungsgemäss zur Auflage an einem ebenfalls umlaufenden Befestigungsflansch 31 des Lagergehäuses vorgesehen ist. Zwischen Zwischenwand 40 und Lagergehäuse 30 ergibt sich radial ausserhalb der umlaufenden Flansche ein Hohlraum 36, welcher zur Kühlung des Gehäusebereichs am äusseren Rand bzw. am Austritt des Verdichterrades verwendet werden kann. So kann beispielsweise ein Kühlmedium (Wasser oder kühle Luft) durch den Hohlraum geleitet werden.On the side facing the bearing area, the disk-shaped intermediate wall 40 has a circumferential fastening flange 41 which, according to the invention, is provided for resting on a likewise circumferential fastening flange 31 of the bearing housing. Between the intermediate wall 40 and the bearing housing 30 there is a cavity 36, radially outside the circumferential flange, which can be used to cool the housing area at the outer edge or at the outlet of the compressor wheel. For example, a cooling medium (water or cool air) can be passed through the cavity.

In die Zwischenwand sind im Bereich des Befestigungsflansches 41 mehrere durchgehende Öffnungen eingelassen, welche jeweils entweder als Sperrluftkanal 42 der Abführung von Sperrluft aus dem Rückraum des Verdichterrades (Fig. 2, obere Hälfte), oder als Bohrung 43 der Aufnahme von Befestigungsmitteln 50 (Fig. 2, untere Hälfte) dienen. Im Flansch 31 des Lagergehäuses sind mit den Öffnungen in der Zwischenwand korrespondierende Bohrungen vorgesehen. Die Auflageflächen der beiden Flansche sind in der dargestellten Ausführungsform als axiale Stirnflächen ausgebildet und verlaufen in einer Ebene senkrecht zur Achse. Optional können die Auflageflächen auch leicht konisch ausgerichtet sein, wobei die Auflageflächen der beiden Flansche streng parallel zueinander verlaufen. Erfindungsgemäss befindet sich radial innerhalb der auf einem Kreis angeordneten Öffnungen eine Dichtstelle 34, vorteilhafterweise als eine oder zwei Nuten mit eingesetztem Dichtungsring ausgebildet. Dabei kann die Nut einseitig entweder in die Auflagefläche des Flansches 41 der Zwischenwand, oder - wie in der dargestellten Ausführungsform - in die Auflagefläche des Flansches 31 am Lagergehäuse, oder aber beidseitig in beide Auflageflächen eingelassen sein. Der Dichtungsring, ein herkömmlicher O-Ring, wird beim Aufsetzen der Zwischenwand auf das Lagergehäuse in axialer Richtung in die Nut gequetscht und dichtet somit zwischen den beiden gegenüberliegenden Auflageflächen. Abgedichtet wird dabei insbesondere der Sperrluftkanal gegenüber dem Lagerbereich, so dass keine Blow-By Strömung in den Lagerbereich entweicht. Aber auch die Befestigungsmittel werden erfindungsgemäss abgedichtet, so dass im oben erwähnten Betriebspunkt mit umgekehrt gerichteten Druckverhältnissen kein Öl oder ölbehaftete Luft aus dem Lagerbereich in den Rückraum des Verdichterrades gelangen kann.In the partition wall, in the area of the fastening flange 41, there are several through openings, each of which either acts as a sealing air duct 42 for the discharge of sealing air from the rear space of the compressor wheel ( Fig. 2 , upper half), or as a hole 43 for receiving fasteners 50 ( Fig. 2 , lower half). In the flange 31 of the bearing housing, holes corresponding to the openings in the intermediate wall are provided. In the embodiment shown, the bearing surfaces of the two flanges are designed as axial end faces and run in a plane perpendicular to the axis. Optionally, the bearing surfaces can also be aligned slightly conically, the bearing surfaces of the two flanges running strictly parallel to one another. According to the invention, a sealing point 34 is located radially inside the openings arranged on a circle, advantageously designed as one or two grooves with an inserted sealing ring. The groove can be embedded in the bearing surface of the flange 41 of the partition wall on one side, or - as in the embodiment shown - in the bearing surface of the flange 31 on the bearing housing, or on both sides in both bearing surfaces. The sealing ring, a conventional O-ring, is squeezed into the groove in the axial direction when the partition is placed on the bearing housing and thus seals between the two opposite bearing surfaces. In particular, the sealing air duct is sealed off from the storage area so that no blow-by flow escapes into the storage area. However, the fastening means are also sealed according to the invention, so that at the above-mentioned operating point with reversed pressure conditions, no oil or oil-laden air can get from the bearing area into the rear space of the compressor wheel.

Wie in Fig. 3 dargestellt, befinden sich mindestens ein Sperrluftkanal 42 und die mehreren Bohrungen zur Aufnahme von Befestigungsmittel 43 erfindungsgemäss auf der gleichen radialen Höhe, liegen also auf einem Kreis konzentrisch zur kreisrunden, scheibenförmigen Zwischenwand. Die Bohrungen zur Aufnahme der Befestigungsmittel können dabei zur Aufnahme eines Schraubenkopfs bis auf eine Resttiefe mit geringerem Durchmesser den gleichen Durchmesser aufweisen wie die Bohrung des Sperrluftkanals. Dadurch erleichtert sich die Herstellung der Zwischenwand. Die Anordnung der beiden Typen von Bohrungen kann regelmässig oder unregelmässig sein. Vorteilhafterweise sind die Befestigungsmittel 50 regelmässig entlang des Umfangs verteilt. Der mindestens eine Sperrluftkanal 42 kann wie dargestellt anstelle einer Befestigungsöffnung, oder aber zusätzlich zwischen zwei in regelmässigem Abstand angeordneten Befestigungsöffnungen angeordnet sein.As in Fig. 3 shown, there are at least one sealing air duct 42 and the multiple bores for receiving fastening means 43 according to the invention at the same radial height, that is, they are on a circle concentric to the circular, disk-shaped partition. The bores for receiving the fastening means can have the same diameter as the bore of the sealing air duct for receiving a screw head, except for a residual depth with a smaller diameter. This facilitates the manufacture of the partition wall. The arrangement of the two types of bores can be regular or irregular. The fastening means 50 are advantageously distributed regularly along the circumference. The at least one sealing air duct 42 can take place as shown a fastening opening, or additionally between two fastening openings arranged at regular intervals.

Fig. 3 zeigt eine Ansicht in axialer Richtung auf die Zwischenwand 40 in dem in Fig. 2 angedeuteten, entlang III-III geführten Schnitt durch den Rückraumbereich des Radialverdichters. Im radial äusseren Bereich der Zwischenwand sind die Vertiefungen der Labyrinthdichtung 44 mit mehreren konzentrischen Kreisen angedeutet. Im radial inneren Bereich ist die Welle 20 und der die Welle umschliessende, zylinderförmige Fortsatz des Verdichterrades dargestellt. Fig. 3 FIG. 11 shows a view in the axial direction of the partition 40 in the FIG Fig. 2 indicated section, along III-III, through the rear area of the centrifugal compressor. In the radially outer area of the partition wall, the depressions of the labyrinth seal 44 are indicated with several concentric circles. In the radially inner area, the shaft 20 and the cylindrical extension of the compressor wheel surrounding the shaft are shown.

Wie in Fig. 4 dargestellt, befinden sich die Fortsetzung des mindestens einen Sperrluftkanals 32 sowie die Bohrungen zur Aufnahme von Befestigungsmittel 33 ebenfalls auf gleicher radialen Höhe, liegen also ebenfalls auf einem Kreis konzentrisch zur Wellenachse. Fig. 4 zeigt Zwischenwand und Lagergehäuse entlang dem in Fig. 2 angedeuteten, entlang IV-IV geführten Schnitt durch den Rückraumbereich des Radialverdichters nach Fig. 2. Dabei ist im radial äusseren Bereich das Lagergehäuse 30 angeschnitten. Anschliessend führt der Schnitt durch den zwischen Zwischenwand und Lagergehäuse eingeschlossenen Hohlraum 36, welcher optional zur Kühlung des Gehäusebereichs am Verdichterrad-Austritt verwendet werden kann. Gegen innen ist der Hohlraum 36 durch den Flansch 31 begrenzt, in welchen erfindungsgemäss die Bohrungen 33 und wenigstens ein Sperrluftkanal 32 angeordnet sind. In dieser Darstellung ist auch die Dichtstelle 34 ersichtlich, welche im Bereich des Flansches 31 aber radial innerhalb von Sperrluftkanal 32 und Bohrungen 33 verläuft. Im radial innersten Bereich ist wiederum die Welle 20, der Fortsatz des Verdichterrades 71 sowie ein Stück der in diesem Bereich zur Lagerseite hin geneigten Zwischenwand 40 angedeutet.As in Fig. 4 shown, the continuation of the at least one sealing air channel 32 and the bores for receiving fastening means 33 are also at the same radial height, that is, they are also on a circle concentric to the shaft axis. Fig. 4 shows partition and bearing housing along the in Fig. 2 indicated, along IV-IV section through the rear area of the centrifugal compressor Fig. 2 . The bearing housing 30 is cut in the radially outer area. The section then leads through the cavity 36 enclosed between the intermediate wall and the bearing housing, which can optionally be used to cool the housing area at the compressor wheel outlet. On the inside, the cavity 36 is delimited by the flange 31, in which, according to the invention, the bores 33 and at least one sealing air channel 32 are arranged. In this illustration, the sealing point 34 can also be seen, which in the region of the flange 31, however, runs radially within the sealing air channel 32 and bores 33. In the radially innermost area, the shaft 20, the extension of the compressor wheel 71 and a piece of the intermediate wall 40 inclined towards the bearing side in this area are indicated.

Die Zwischenwand 40 ist erfindungsgemäss, trotz vorhandener Sperrluftdurchführung, eine rotationssymmetrische Scheibe, welche in der Herstellung durch Drehen und ohne Fräsen in ihre endgültige Form gebracht werden kann. Für die Sperrluftdurchführung ist lediglich ein Bohrer notwendig, welcher ebenfalls für das Anbohren der Bohrungen zur Aufnahme der Befestigungsmittel verwendet werden kann. Dadurch kann der Herstellungsprozess gegenüber einer herkömmlichen Zwischenwand vereinfacht werden.In spite of the presence of a sealing air duct, the partition 40 is, according to the invention, a rotationally symmetrical disk which can be brought into its final shape during manufacture by turning and without milling. Only a drill is required for the sealing air duct, which can also be used to drill the holes to accommodate the fastening means. As a result, the manufacturing process can be simplified compared to a conventional partition wall.

Optional weist die Zwischenwand eine zusätzliche Positionierungsbohrung auf, welche zur Aufnahme eines Positionierungsstifts vorgesehen ist, welcher am Lagergehäuse angebracht ist oder vor der Montage in eine dafür vorgesehenen Positionierungsbohrung im Lagergehäuse eingebracht wird. Dadurch lässt sich die Zwischenwand bei der Montage bezüglich der Winkellage gegenüber dem Lagergehäuse einfacher Positionieren. Optional lässt sich die Positionierung durch eine unregelmässige Verteilung der Bohrungen zur Aufnahme der Befestigungsmittel realisieren.Optionally, the partition has an additional positioning bore, which is provided for receiving a positioning pin, which is located on the bearing housing is attached or is introduced into a positioning hole provided for this purpose in the bearing housing before assembly. This makes it easier to position the partition wall with respect to the angular position relative to the bearing housing during assembly. Optionally, the positioning can be realized by an irregular distribution of the bores for receiving the fastening means.

BEZEICHNUNGSLISTEDESIGNATION LIST

1010
AbgasturbineExhaust gas turbine
1111
TurbinenradTurbine wheel
1212th
GaseintrittsgehäuseGas inlet housing
1313th
GasaustrittsgehäuseGas outlet housing
2020th
Wellewave
3030th
LagergehäuseBearing housing
3131
Befestigungsflansch mit AuflageflächeMounting flange with support surface
3232
SperrluftkanalSealing air duct
3333
Bohrung zur Aufnahme von BefestigungsmittelnHole for receiving fasteners
34, 3534, 35
Dichtstelle, Umlaufende Nut mit DichtungsringSealing point, circumferential groove with sealing ring
3636
Hohlraum, für Kühlung des Verdichterrades nutzbarCavity, usable for cooling the compressor wheel
4040
ZwischenwandPartition wall
4141
Befestigungsflansch mit AuflageflächeMounting flange with support surface
4242
SperrluftkanalSealing air duct
4343
Bohrung zur Aufnahme von BefestigungsmittelnHole for receiving fasteners
4444
Labyrinth-Dichtung zwischen Verdichterrad und ZwischenwandLabyrinth seal between the compressor wheel and the partition
5050
BefestigungsmittelFasteners
7070
Verdichtercompressor
7171
VerdichterradCompressor wheel
7272
VerdichtergehäuseCompressor housing

Claims (7)

  1. Bearing device for the mounting of a rotor of a compressor, comprising:
    - a bearing housing (30), which encloses a bearing chamber with a central opening for receiving the rotor, and
    - an intermediate wall (40) for sealing off a rear chamber of a compressor wheel of the compressor with respect to the bearing chamber, wherein the intermediate wall comprises a rotationally symmetrical, disc-shaped main body with a central opening for the leadthrough of the rotor, wherein, in the region of the central opening, there are provided means for sealing off a transition to the rotor,
    wherein the intermediate wall comprises an encircling fastening flange (41) which is of rotationally symmetrical shape and which is provided for the fastening of the intermediate wall to the bearing housing and which has a planar contact surface for support on a contact surface of the bearing housing, wherein multiple bores (42, 43) are formed into the fastening flange (41) on a virtual circular line, and wherein the bores comprise at least one sealing-air channel (42) and multiple bores (43), arranged so as to be distributed in a circumferential direction on the virtual circular line, for receiving fastening means,
    wherein the bearing housing comprises an encircling fastening flange (31) which is provided for the fastening of the intermediate wall (40) to the bearing housing (30) and which has a planar contact surface for support on the contact surface of the fastening flange (41) of the intermediate wall,
    wherein multiple bores (32, 33) are formed into the fastening flange (31) of the bearing housing on a virtual circular line, wherein the bores comprise at least one sealing-air channel (32) and multiple bores (33), which are arranged so as to be distributed in a circumferential direction on the virtual circular line, for receiving fastening means, and wherein the multiple bores (32, 33) of the fastening flange (31) of the bearing housing correspond with the multiple bores (42, 43) of the fastening flange (41) of the intermediate wall (40), such that the at least one sealing-air channel (32) of the fastening flange (31) of the bearing housing forms an axial continuation of the at least one sealing-air channel (42) of the intermediate wall (40), wherein the bores (43) for receiving fastening means are arranged in the fastening flange of the intermediate wall (40), and the at least one sealing-air channel (42) of the fastening flange of the intermediate wall is arranged in each case between two adjacently arranged bores (43) of the fastening flange of the intermediate wall (40) for receiving fastening means (50).
  2. Bearing device according to Claim 1, wherein further means (34) for sealing off the transition between bearing housing and intermediate wall are provided in the region of the contact surfaces, radially within the virtual circular lines.
  3. Bearing device according to Claim 2, wherein a first groove (34) for receiving a seal ring is formed into the contact surface on the flange (31) of the bearing housing (30), radially within the virtual circular lines.
  4. Bearing device according to any one of Claims 1 to 3, wherein a second groove (35) for receiving a seal ring is formed into the contact surface of the fastening flange (41) of the intermediate wall (40).
  5. Bearing device according to any one of Claims 1 to 4, wherein the bores (43) for receiving fastening means in the fastening flange of the intermediate wall (40) are arranged at regular angular intervals on the virtual circular line.
  6. Radial compressor, comprising a rotor with a shaft (20), which is mounted rotatably in a bearing device according to any one of Claims 1 to 6, and with a compressor wheel (71).
  7. Exhaust-gas turbocharger comprising a radial compressor according to Claim 6.
EP14155860.1A 2013-02-28 2014-02-20 Partition for sealing the rear section of a radial compressor Active EP2772652B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013203455.5A DE102013203455A1 (en) 2013-02-28 2013-02-28 Partition wall for sealing the rear space of a centrifugal compressor

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EP2772652A2 EP2772652A2 (en) 2014-09-03
EP2772652A3 EP2772652A3 (en) 2018-03-28
EP2772652B1 true EP2772652B1 (en) 2021-10-06

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CN109209520B (en) * 2018-09-13 2023-08-04 中国科学院工程热物理研究所 Structure for inhibiting leakage flow loss of back cavity of centripetal turbine impeller

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CN104018933B (en) 2016-10-12
EP2772652A2 (en) 2014-09-03
JP2014169699A (en) 2014-09-18
CN104018933A (en) 2014-09-03
EP2772652A3 (en) 2018-03-28
KR20140108123A (en) 2014-09-05
DE102013203455A1 (en) 2014-08-28
JP5850965B2 (en) 2016-02-03
KR101617938B1 (en) 2016-05-18

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