DE102013110843A1 - Turbocharger arrangement with cooling device - Google Patents

Abstract

The present invention relates to a turbocharger assembly having a cooling system. The turbocharger arrangement (1) comprises a first compressor wheel (3), the first compressor wheel (3) being arranged on a rotatably mounted shaft (2), a plurality of bearings (6, 7) for supporting the shaft (2), a heat exchanger (9 ) configured to flow compressed air from the first compressor wheel (3), a lubricant supply (14) for providing lubricant (10) for lubricating the bearings (6, 7). According to the invention, the heat exchanger (9) in the lubricant supply (14) is arranged so that a heat exchange between the air in the heat exchanger (9) with the lubricant (10) can be achieved, whereby on the one hand the air in the heat exchanger (9) cooled and on the other hand Lubricant (10) is preheated before the lubricant (10) is supplied to the bearings (6, 7) for lubrication.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a turbocharger arrangement with cooling device for cooling compressed air of a compressor arrangement. Furthermore, the present invention relates to a turbocharger arrangement with a multi-stage compressor arrangement and with a cooling device.

STATE OF THE ART

To ensure a given performance of a turbocharger with single or multi-stage compressor, turbochargers of the prior art often cool the compressed air before it is fed to the engine. For this purpose, these turbochargers use a charge air cooler. The charge air cooler improves the thermodynamic process efficiency and increases the amount of air supplied to the engine per charge change. In the book of Merker et al. "Fundamentals Combustion Engines - Functioning, Simulation, Measurement Technology", 6th, supplemented edition, Vieweg + Teubner Verlag, is on page 202 For example, a turbocharger with a multi-stage compressor arrangement is described which comprises a charge air cooler. The cooling of the compressed air takes place in such a way that with a coolant such as water, a heat exchange between the coolant and the compressed air is performed. The coolant absorbs the dissipated heat, which is generated during the compression process, and then performs this again by the coolant is discharged from the intercooler again.

In addition, to ensure lubrication of the bearing of the turbocharger, which carry the rotating shaft, the bearings are supplied via a lubricant supply with oil as a lubricant. In addition to the supply of lubricant, some turbocharger arrangements provide so-called emergency oil tanks. In the EP2054597 such an application is described. This is to ensure that in case of failure or a failure of the regular lubricant supply, the bearings are still supplied by the emergency oil tank continuously during the leakage of the lubricating oil to a standstill with lubricant in order not to jeopardize the operation of the turbocharger assembly.

However, the provision of separate devices for cooling compressed air and a lubricant supply for a turbocharger assembly as described above, always leads to a technical overhead, which must be taken into account in the maintenance and operating costs of the engine system.

SUMMARY OF THE INVENTION

The object of the present invention is to refine a turbocharger arrangement with a cooling device in such a way that the expense of providing coolant and lubricant for use in the turbocharger arrangement is reduced.

The object is solved by the features of independent claim 1.

In particular, the object is achieved by a turbocharger arrangement, comprising a first compressor wheel, wherein the first compressor wheel is arranged on a rotatably mounted shaft, a plurality of bearings for supporting the shaft, a heat exchanger, which is designed to flow compressed air from the first compressor wheel, a lubricant supply for providing lubricant for lubricating the bearings, and wherein the heat exchanger is arranged in the lubricant supply, so that a heat exchange between the air in the heat exchanger with the lubricant can be achieved, whereby on the one hand, the air is cooled in the heat exchanger and on the other hand, the lubricant is preheated before the lubricant is supplied to the bearings for lubrication.

Since the heat exchanger is arranged in the lubricant supply, a thermal coupling takes place between the air in the heat exchanger and the lubricant in the lubricant supply.

The present invention advantageously reduces the technical complexity of cooling the compressed air and the optimum lubrication of the bearings. The lubricant is preheated to an optimum temperature by heat exchange with the compressed air. At the same time the compressed air is cooled from the compressor. A preheated lubricant has the advantage that when using oil as a lubricant, the viscosity of the oil is reduced and in this way the bearing losses are reduced.

The lubricant can also be used advantageously for spray oil cooling for the compressor stage of the turbocharger assembly. In this way, can be dispensed with the use of additional provided with engine cooling water cooling circuits between the engine and turbocharger assembly.

PREFERRED EMBODIMENTS OF THE INVENTION

In a preferred embodiment of the present invention, it is provided that a part of the lubricant supply a surface which is in contact with the heat exchanger.

The term contact should be understood to mean the following:
First, a portion or portion of the surface of the lubricant supply may enter into direct physical contact with a surface of the heat exchanger. By a contact of the two surfaces can then be made a thermal coupling between the compressed air in the heat exchanger and the lubricant in the lubricant supply.

On the other hand, it is also possible if a part or a portion of the surface of the lubricant supply comes into contact with the compressed air in the heat exchanger in order to allow a heat exchange between the compressed air in the heat exchanger and the lubricant in the lubricant supply. The line or a conduit system through which the lubricant is transported can then be preferably passed directly through the heat exchanger. The heat exchanger is then arranged in the lubricant supply in this case. For the quality and speed of the heat exchange between the compressed air and the lubricant, therefore, the size of the surface of the lubricant supply of importance.

In a further preferred embodiment of the present invention, the heat exchanger comprises in its interior a conduit system through which compressed air flows, wherein the conduit system comprises at least one surface, so that the compressed air with the lubricant, which is introduced into the heat exchanger, can be thermally coupled. In and through the conduit system, which is arranged substantially in the interior of the heat exchanger or at least forms a part of the heat exchanger, flows the compressed and warm air, which is introduced from the first compressor in the line system of the heat exchanger. The compressed air flows through the heat exchanger by means of the line system and exits at another end of the heat exchanger out of the heat exchanger, for example, to be supplied to the engine or another compressor stage. By means of the surface of the conduit system in the heat exchanger, which at least physically separates the compressed air in the line system from the lubricant so that no physical mixing of air and lubricant takes place in this embodiment, the heat exchange between the compressed air in the line system and the lubricant to be heated in heat exchanger. The lubricant to be heated is introduced into the heat exchanger, for example via a lubricant supply. In this way, therefore, a thermal coupling between the compressed air and the lubricant can also be produced by means of the conduit system, which results in a heat exchange between compressed air and lubricant. The size of the surface of the conduit within the heat exchanger for the compressed air then also affects the quality of the heat exchange between the compressed air and the lubricant.

In a preferred embodiment of the present invention, the lubricant supply is located above the bearings. This has the advantage that the direction of the lubricant flow is directed due to gravity. This is important, for example, if an emergency oil pump fails, which provides for the transport of the lubricant to the bearings. Then at least the supply of lubricants bearing is ensured.

In a preferred embodiment of the present invention, oil is used as the lubricant.

In a preferred embodiment of the present invention, the lubricant supply has a tank of lubricant. The tank can be formed in an advantageous manner as a Notöltank, which provides oil as a lubricant when a regular supply of lubricant should fail. The tank may be installed inside the turbocharger assembly near the main oil consumers. However, the tank may also be installed outside the turbocharger assembly or outside the engine system, from which a conduit of lubricant is fed to the engine system. It is advantageous if the tank is arranged above the bearings, which carry the rotating shaft. Then the lubricant from the tank is guided solely by gravity through the line in the heat exchanger, which may favor the saving of an emergency oil pump, which would otherwise pump the lubricant from the tank to the camps.

In another embodiment of the present invention, the tank could provide at least one surface which contacts a surface of the heat exchanger to effect thermal coupling between the tank and the heat exchanger.

In an alternative embodiment of the present invention, the tank and the heat exchanger could also be formed as a common component. In such a case, the tank for the lubricant would already be integrated in the heat exchanger. The heat exchanger could then additionally contain a reservoir with lubricant. The lubricant would then be by means of the reservoir with the compressed air, which is the heat exchanger flows through, is thermally coupled. The reservoir could be interchangeable. However, the reservoir could also have a connection to a lubricating oil supply device to fill the reservoir with lubricant.

In a preferred embodiment of the present invention, the turbocharger assembly includes a multi-stage compressor assembly having a first compressor wheel, a second compressor wheel, the first compressor wheel and the second compressor wheel being mounted on a rotatably mounted shaft; and wherein at least one radial bearing is disposed between the first compressor wheel and the second compressor wheel, a heat exchanger configured to flow compressed air from the first compressor wheel, a lubricant supply for providing lubricant for lubricating the bearings, the heat exchanger in the lubricant supply is arranged, so that a heat exchange between the air in the heat exchanger with the lubricant can be achieved, whereby on the one hand cooled the air in the heat exchanger and on the other hand, the lubricant is preheated before the lubricant is supplied to the bearings for lubrication.

The use of a turbocharger assembly having a multi-stage compressor assembly includes individual compressor wheels which are connected in series and carried by a common shaft. Between the two compressor wheels at least one bearing is arranged. Between both compressor wheels there is an axial distance, which is defined by the at least one bearing, which is arranged between the two compressor wheels. Due to the fact that the two compressor wheels are arranged at a distance from each other, the advantage is achieved inter alia that a higher pressure ratio of the charge air can be achieved. The air exiting and compressed from the first compressor wheel is intercooled via the heat exchanger before the cooled air is supplied to the second compressor wheel.

The lubricant supply can advantageously be arranged between the two compressor wheels. This makes it possible, on the one hand, to act on the at least one bearing between the compressor wheels with lubricant, which may be in the form of oil. On the other hand, a so-called spray oil cooling for cooling, for example, at least one compressor wheel and a compressor housing is made possible in this way, so that another coolant, such as engine cooling water, can be saved. The present invention is not limited to two compressor wheels.

In a preferred embodiment of the turbocharger arrangement with a multi-stage compressor arrangement, it is provided that a part of the lubricant supply has a surface which is in contact with the heat exchanger.

In a preferred embodiment of the turbocharger arrangement with a multi-stage compressor arrangement, the heat exchanger comprises in its interior a conduit system through which compressed air flows, wherein the conduit system comprises at least one surface, so that the compressed air with the lubricant, which is introduced into the heat exchanger, can be thermally coupled is. In the line system, which is arranged substantially in the interior of the heat exchanger or at least forms a part of the heat exchanger, flows the compressed and warm air, which is introduced from the first compressor in the line system of the heat exchanger. The compressed air flows through the heat exchanger by means of the line system and exits at another end of the heat exchanger out of the heat exchanger, for example, to be supplied to the engine or another compressor stage. By means of the surface of the conduit system in the heat exchanger, which at least physically separates the compressed air in the conduit system from the lubricant, so that no physical mixing of air and lubricant takes place, then the heat exchange between the compressed air in the conduit system and the lubricant to be heated in the heat exchanger. The lubricant to be heated is introduced into the heat exchanger, for example via a lubricant supply. In this way, therefore, a thermal coupling between the compressed air and the lubricant can also be produced by means of the conduit system in the heat exchanger, which results in a heat exchange between compressed air and lubricant. The size of the surface of the conduit within the heat exchanger for the compressed air then also affects the quality of the heat exchange between the compressed air and the lubricant.

In a preferred embodiment of the turbocharger arrangement with a multi-stage compressor arrangement, the lubricant supply is arranged above the bearings. This has the advantage that the direction of the lubricant flow is directed due to gravity. A pump for conveying the lubricant flow to the bearings may be dispensed with in such a case.

In a preferred embodiment of the turbocharger assembly having a multi-stage compressor assembly, the lubricant supply includes a tank of lubricant, wherein the lubricant may be formed as oil. The tank can be formed in an advantageous manner as a Notöltank, which oil as a lubricant provides when a regular lubricant supply should fail. The tank may be installed inside the turbocharger assembly near the main oil consumers. However, the tank may also be installed outside the turbocharger assembly or outside the engine system, from which a conduit of lubricant is fed to the engine system. It is advantageous if the tank is arranged above the bearings, which carry the rotating shaft. Then the lubricant from the tank is guided solely by gravity through the line in the heat exchanger, which may favor the saving of an emergency oil pump, which would otherwise pump the lubricant from the tank to the camps.

In another embodiment of the present invention, the tank could provide at least one surface in contact with a surface of the heat exchanger to provide thermal coupling between the compressed air and the lubricant. The tank and the heat exchanger could also be designed as a common component, that is, in the heat exchanger, the tank for the lubricant is already integrated. The heat exchanger could thus also contain a reservoir with lubricant. The lubricant would then be thermally coupled by means of the reservoir with the compressed air, which flows through the heat exchanger. The reservoir could be interchangeable. However, the reservoir could also be connected to a lubricant supply device to fill the reservoir with lubricant. An exemplary application of the inventive turbocharger arrangement with a single-stage or multi-stage compressor arrangement could be the use in a two-stroke engine. Alternatively, the reservoir in the heat exchanger could alternatively be formed by at least one surface or partition wall disposed within the heat exchanger, the surface physically separating the media, air, and lubricant within the heat exchanger. As a preferred application, the turbocharger assembly could be used with a single stage or multi-stage compressor assembly for a two-stroke engine.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to exemplary embodiments, which are explained in more detail with reference to drawings. Hereby show:

1 shows a turbocharger assembly with a single-stage compressor assembly and with a cooling device according to a first embodiment of the present invention;

2 shows a turbocharger assembly with a two-stage compressor assembly with cooling device according to a second embodiment of the present invention.

In the following description, identical reference numerals are used for the same and like-acting parts.

DETAILED DESCRIPTION OF THE DRAWINGS

1 shows a first embodiment of a turbocharger assembly 1 with a single-stage compressor arrangement. The turbocharger assembly includes a compressor wheel 3 and a turbine wheel 5 which on a rotatably mounted shaft 2 are arranged. The shaft is supported by several bearings, at least one radial bearing 6 and at least one thrust bearing 7 , A lubricant supply 14 , which may be designed as a conduit, conveys lubricant, which may preferably be oil, for the lubrication of the bearings 6 . 7 , The heat exchanger is arranged in the lubricant supply. The heat exchanger 9 can be inside or outside the turbocharger arrangement 1 be arranged.

The air in the heat exchanger 9 is there with the lubricant in the lubricant supply 14 thermally coupled. The heat exchanger 9 is formed, compressed air from the compressor wheel 3 to flow through. First, there is air 11 from the outside of the compressor wheel 3 sucked and compressed. The compressed air 12 is then via a line to the heat exchanger 9 fed. There is a heat exchange between that in the heat exchanger 9 located air and the lubricant in the lubricant supply 14 , In this sense, so the lubricant from the lubricant supply 14 doing so by means of the heat exchanger 9 thermally coupled with the air. The lubricant supply 14 can be designed as a line, of which a section directly into the heat exchanger 9 in and out again, that means the heat exchanger 9 in this sense in the lubricant supply 14 is arranged. Alternatively, a portion of the conduit could also be provided with a preferably-separating surface of the heat exchanger 9 to be in direct contact. By the heat exchange in the heat exchanger 9 The lubricant is preheated before it reaches the bearings 6 . 7 is distributed. At the same time, however, the compressed air in the heat exchanger 9 cooled down before this over a pipe 13 from the heat exchanger 9 out to a motor connected to the turbocharger (not shown). In this way, the performance and the efficiency of the engine can be increased because in the compressed and cooled air in the same volume of the engine compartment, a larger amount of air is included. To this Way, more fuel can be burned in the engine compartment. A tank 16 that with the lubricant supply 14 may be provided to be used as emergency oil tank when in the turbocharger assembly 1 provided lubricant supply systems fail or because of leakage no longer sufficient lubricant in the turbocharger assembly 1 is available. The lubricant supply 14 is with the tank 16 connected, so that the preheated lubricant directly into the tank 16 flow and can be stored there as a stock. Alternatively, the tank could 16 but also outside the turbocharger arrangement 1 be arranged to if necessary by means of the lubricant supply 14 , which may be designed as a conduit, provide lubricant, which after preheating by the heat exchanger 9 on the bearings via an outlet opening 17 at the tank 16 is distributed and which can also be used for a spray oil cooling of the compressor-side housing. The Tank 16 but could alternatively also below the camp 6 . 7 be arranged. A pump (not shown) would then have to provide the lubricant to the bearings 6 . 7 is transported.

Another possibility is a thermal coupling between the compressed air in the heat exchanger 9 and to produce the lubricant can also be when the lubricant directly into the heat exchanger 9 of the 1 flows before it enters the tank 16 is initiated. The heat exchanger 9 itself then includes in its interior, for example, a pipe system 18 , where the pipe system 18 in the heat exchanger 9 a surface 19 which shows the air in the pipe system 8th from the lubricant in the heat exchanger 9 physically separated from each other. The lubricant and the air in this embodiment are preferably not in direct physical contact with each other. Through the pipe system 18 then flows the compressed and warm air, which from the first compressor wheel 3 in the heat exchanger 9 is introduced and which at one end of the heat exchanger 9 the heat exchanger 9 leaves again. By means of the separating surface between the pipe system 18 in the heat exchanger 9 and the lubricant to be heated in the heat exchanger 9 then takes place the heat exchange between the compressed air and the lubricant. In this way, so also a thermal coupling between the compressed air and the lubricant can be produced. As a result of the heat exchange, the compressed air is cooled and the lubricant is heated. The larger the surface of the pipe system 18 in the heat exchanger, the more efficient and faster the heat exchange between the two media air and lubricant can take place. Via an opening in the heat exchanger 9 (not shown) could the preheated lubricant after a successful heat exchange with the compressed air in the heat exchanger 9 the heat exchanger 9 leave again. The lubricant could then be directly into the tank 16 be introduced, which may also be designed as Notöltank. About an opening 17 in the tank 16 could then be the preheated lubricant for lubrication on the bearings 6 . 7 or for spray oil cooling of the compressor stage 3 be drained.

Alternatively, however, an embodiment of the present invention would be conceivable in which the heat exchanger 9 in the lubricant supply 14 is arranged, but in which both media, so air and lubricant, physically mix together. For this purpose, for example, the lubricant would be directly into the heat exchanger 9 introduced and the air in the heat exchanger 9 then would not be with a pipe system 18 inside the heat exchanger 9 through the heat exchanger 9 but would be in the heat exchanger 9 moving freely from one end to another end of the heat exchanger 9 ,

2 shows a second embodiment of a turbocharger assembly 20 with a multi-stage compressor arrangement 30 , The turbocharger arrangement 20 includes a first compressor wheel 3 , a second compressor wheel 4 and a turbine wheel 5 which on a rotatably mounted shaft 2 are arranged. The shaft is supported by several bearings, at least one radial bearing 6 and at least one thrust bearing 7 , In the multi-stage compressor arrangement 30 can be the first compressor wheel 3 as a low pressure compressor wheel and the second compressor wheel 4 be designed as a high pressure compressor wheel.

The first compressor wheel 3 and the second compressor wheel 4 are in this embodiment the 2 are connected in series and are supported by a common shaft. Between the first compressor wheel 3 and the second compressor wheel 4 is at least one warehouse 6 or a warehouse 7 arranged. Between the first compressor wheel 3 and the second compressor wheel 4 there is a distance, which of the at least one bearing 6 or the warehouse 7 is defined, which between the first compressor wheel 3 and the second compressor wheel 4 is arranged. By the spaced apart two compressor wheels 3 . 4 Among other things, the advantage is achieved that a higher pressure ratio before the engine can be achieved.

In contrast to the known from the prior art so-called back-to-back compressor stages in which both compressor stages are not spaced from each other on the common shaft, brings in 2 illustrated form of the arrangement of the individual compressor wheels 3 . 4 the following advantages: Only low shaft load, as there is no overhanging Verdichterradmasse on the compressor side of the turbocharger are, avoiding expensive wiring between the low-pressure and high-pressure compressor stage, lower vibration excitation on the inlet side of the high-pressure compressor stage and a manageable axial thrust, which is caused by a pressure difference between the compressor and turbine side, because this must be absorbed by axial thrust bearings However, their capacity is limited. Another advantage is the fact that a larger space for the gas outlet housing of the turbine is available, resulting in a better, turbine-side outflow of the gas with good pressure recovery.

The turbocharger arrangement 20 of the 2 comprises a cooling device for cooling compressed air via a heat exchanger 9 and a lubricant supply 14 for providing lubricant.

As in 1 already shown in detail, can also in 2 between the compressed air in the heat exchanger 9 and the lubricant can be thermally coupled in a variety of ways. In the 1 described ways of implementing a thermal coupling are therefore also for the turbocharger assembly 20 in 2 implemented.

From the first compressor wheel 3 gets air from outside 11 sucked and compressed. The compressed air 12 becomes the heat exchanger 9 fed. The heat exchanger 9 is in one embodiment in the lubricant supply 14 arranged. It has a part or a portion of the lubricant supply 14 which may for example be formed as a surface of a pipe or conduit, either direct contact with a surface of the heat exchanger 9 or leads directly into the heat exchanger 9 into it. A heat exchange then takes place between the air in the heat exchanger 9 and the lubricant in the lubricant supply 14 in a section or area within the heat exchanger 9 , in which a portion of the lubricant supply 14 inside the heat exchanger 9 located. The heat exchanger 9 can thus in this sense in the lubricant supply 14 be arranged. In this way, the air in the heat exchanger 9 with the lubricant in the lubricant supply 14 thermally coupled. The thus cooled air in the heat exchanger 9 is then via a line 13 in the second compressor wheel 4 introduced or alternatively passed directly to the engine (not shown). The preheated lubricant is placed in a tank 16 directed, which can serve as Notöltank, and from there via an outlet opening 17 in the tank 16 to the camps 6 . 7 distributed.

Alternatively, the preheated lubricant for a splash oil cooling for the first compressor 3 be used. Preferably, in 1 and 2 the lubricant supply 14 and the tank 16 above the camp 6 . 7 arranged so that due to the gravity of the flow direction of the lubricant is carried out automatically - namely in the direction of the shaft 2 and the camp 6 . 7 , In this way, a pump, which may be designed as an additional emergency oil pump for the transport of the lubricant, save on its consumption location. In an alternative embodiment of the thermal coupling and as detailed below 1 described, the lubricant is directly in the heat exchanger 9 initiated. The heat exchanger 9 itself then includes in its interior, for example, a pipe system 18 which is opposite to the lubricant in the heat exchanger 9 a surface 19 having. Through the pipe system 18 then flows the compressed and warm air, which from the first compressor wheel 3 in the heat exchanger 9 is introduced and which at one end of the heat exchanger 9 leaves the heat exchanger again.

By means of the surface between the pipe system 18 in the heat exchanger 9 , which the compressed air in the pipe system 18 from the lubricant to be heated in the heat exchanger 9 separates, then carried out a heat exchange between the lubricant to be heated in the heat exchanger 9 and the compressed air. In this way, so also a thermal coupling between the compressed air and the lubricant can be produced. As a result of the heat exchange, the compressed air is cooled and the lubricant is heated. Via an opening in the heat exchanger 9 (not shown) could the preheated lubricant after a successful heat exchange with the compressed air in the heat exchanger 9 the heat exchanger 9 leave again. The lubricant could then be directly into the tank 16 be introduced, which may also be designed as Notöltank. About an opening 17 in the tank 16 could then be the preheated lubricant for lubrication on the bearings 6 . 7 or for spray oil cooling of the compressor stage 3 be drained. As a possible application example, the turbocharger assembly of the present invention could be used with a single-stage or multi-stage compressor assembly for a two-stroke engine.

LIST OF REFERENCE NUMBERS

1

turbocharger assembly

2

wave

3

compressor

4

compressor

5

turbine

6

radial bearings

7

thrust

9

heat exchangers

11

Air flow from the outside

12

Compressed air

13

Cooled and compressed air

14

lubricant supply

16

tank

17

outlet

18

line system

19

Surface of the pipe system

20

turbocharger assembly

30

compressor assembly

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2054597 [0003]

Cited non-patent literature

• Merker et al. "Fundamentals of Combustion Engines - Functionality, Simulation, Measurement Technology", 6th, supplemented edition, Vieweg + Teubner Verlag, on page 202 [0002]

Claims (15)

Turbocharger arrangement ( 1 ), comprising: - a first compressor wheel ( 3 ), wherein the first compressor wheel ( 3 ) on a rotatably mounted shaft ( 2 ) is arranged; - several warehouses ( 6 . 7 ) for supporting the shaft ( 2 ); A heat exchanger ( 9 ), which is formed, compressed air from the first compressor wheel ( 3 ) to flow through; A lubricant supply ( 14 ) for providing lubricant ( 10 ) for the lubrication of the bearings ( 6 . 7 ); characterized in that the heat exchanger ( 9 ) in the lubricant supply ( 14 ) is arranged so that a heat exchange between the air in the heat exchanger ( 9 ) with the lubricant ( 10 ), whereby on the one hand the air in the heat exchanger ( 9 ) and on the other hand the lubricant ( 10 ) is preheated before the lubricant ( 10 ) the camps ( 6 . 7 ) is supplied for lubrication. Turbocharger arrangement ( 1 ) according to claim 1, characterized in that a part of the lubricant supply ( 14 ) a surface ( 15 ), which with the heat exchanger ( 9 ) is in contact. Turbocharger arrangement ( 1 ) according to claim 1 or 2, characterized in that the lubricant supply ( 14 ) above the bearings ( 6 . 7 ) is arranged. Turbocharger arrangement ( 1 ) according to one of the preceding claims, characterized in that the lubricant supply ( 14 ) a tank ( 16 ) with lubricant ( 10 ) having. Turbocharger arrangement ( 1 ) according to claim 4, characterized in that the tank ( 16 ) above the bearings ( 6 . 7 ) is arranged. Turbocharger arrangement ( 1 ) according to one of the preceding claims, characterized in that the heat exchanger ( 9 ) in its interior a pipe system ( 18 ), through which compressed air flows, wherein the conduit system ( 18 ) at least one surface ( 19 ), so that the compressed air with the lubricant, which in the heat exchanger ( 9 ), is thermally coupled. Turbocharger arrangement ( 1 ) according to one of the preceding claims 1 to 6, characterized in that the lubricant ( 10 ) Oil is. Turbocharger arrangement ( 20 ) with a multi-stage compressor arrangement ( 30 ), comprising: - a first compressor wheel ( 3 ); A second compressor wheel ( 4 ); - wherein the first compressor wheel ( 3 ) and the second compressor wheel ( 4 ) on a rotatably mounted shaft ( 2 ) is arranged; and - wherein between the first compressor wheel ( 3 ) and the second compressor wheel ( 4 ) at least one radial bearing ( 6 ) is arranged; A heat exchanger ( 9 ), which is formed, compressed air from the first compressor wheel ( 3 ) to flow through; A lubricant supply ( 14 ) for providing lubricant ( 10 ) for the lubrication of the bearings ( 6 . 7 ); characterized in that the heat exchanger ( 9 ) in the lubricant supply ( 14 ) is arranged so that a heat exchange between the air in the heat exchanger ( 9 ) with the lubricant ( 10 ), whereby on the one hand the air in the heat exchanger ( 9 ) and on the other hand the lubricant ( 10 ) is preheated before the lubricant ( 10 ) the camps ( 6 . 7 ) is supplied for lubrication. Turbocharger arrangement ( 20 ) according to claim 8, characterized in that a part of the lubricant supply ( 14 ) a surface ( 15 ), which with the heat exchanger ( 9 ) is in contact. Turbocharger arrangement ( 20 ) according to claim 8 or 9, characterized in that the lubricant supply ( 14 ) above the bearings ( 6 . 7 ) is arranged. Turbocharger arrangement ( 20 ) according to one of claims 8 to 10, characterized in that the lubricant supply ( 14 ) a tank ( 16 ) with lubricant ( 10 ) having. Turbocharger arrangement ( 20 ) according to one of claims 8 to 11, characterized in that the heat exchanger ( 9 ) in its interior a pipe system ( 18 ), through which compressed air flows, wherein the conduit system ( 18 ) at least one surface ( 19 ), so that the compressed air with the lubricant, which is introduced into the heat exchanger, can be thermally coupled. Turbocharger arrangement ( 20 ) according to claim 11, characterized in that the tank ( 16 ) above the bearings ( 6 . 7 ) is arranged. Turbocharger arrangement ( 20 ) according to one of the preceding claims 8 to 13, characterized in that the lubricant ( 10 ) Oil is. Two-stroke engine with a turbocharger arrangement ( 1 ) according to one of claims 1 to 7 or a turbocharger arrangement ( 20 ) according to one of claims 8 to 14.

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