DE102019115011A1 - Compressor with inlet insert and return duct - Google Patents

Abstract

The invention relates to a compressor for a charging device. The compressor comprises a compressor housing, an inlet insert with an inlet section and a jacket section. The compressor further comprises a return duct which extends along a chord line from a duct inlet which is arranged axially between the jacket section and the compressor housing to a duct outlet which is arranged axially between the inlet section and the jacket section. The chord line has a chord length au. The return duct has a first duct section that extends between the jacket section and the compressor housing, and a second duct section that extends between the jacket section and the inlet section. There are no flow obstacles in the first channel section.

Description

Technical area

The present disclosure relates to a compressor for a supercharger. The invention further relates to a charging device which has such a compressor.

background

There is a sweeping change in the individual mobility industry. In particular, the increasing number of electric vehicles that are coming onto the market means that conventional vehicles with internal combustion engines (ICE) are required to be more efficient. That is why more and more vehicles are being equipped with measures to increase efficiency, such as B. Charging devices or lightweight construction. Charging devices are widely known, for example, in which a compressor, which can be driven by an electric motor and / or an exhaust-gas powered turbine wheel, supplies compressed air to the ICE. This leads to an increase in the performance of the ICE.

Ordinary compressors include a compressor housing and a compressor wheel which is arranged in the housing. In operation, air is drawn in through a compressor inlet of the housing and is accelerated by the compressor wheel and then exits the compressor via a spiral in the compressor housing. Each compressor shows its specific compressor map, the operation of the compressor being limited to an area in the compressor map between the surge limit and the stuffing limit.

To further improve the efficiency of the ICE, it is known that the compressor map, e.g. B. by preventing pumping, d. H. Taking action to move the surge line to the left, improved. This can be done, for example, by providing compressor inlet adjustment mechanisms. Conventional adjustment mechanisms are configured, for example, to increase the speed of the airflow, modify the flow angle, or establish a flow path return. Flow path recirculation is performed by diverting a portion of at least a portion of pressurized air and returning that portion back to the compressor inlet. This latter method is often referred to as a "ported shroud" system. However, "ported shroud" systems known in the art regularly generate flow disturbances and are difficult to manufacture.

Accordingly, it is the object of the present invention to increase the efficiency of a compressor by providing improved compressor recirculation.

Brief description

The present invention relates to a compressor as set out in claim 1 and a corresponding turbocharger comprising such a compressor as set out in claim 15. Further embodiments are described in the dependent embodiments.

The inventive compressor for a supercharger comprises a compressor housing, an inlet insert and a return passage. The inlet insert includes an inlet section and a shell section. The return channel extends along a chord line from a channel inlet to a channel outlet. The duct inlet is arranged axially between the jacket section and the compressor housing. The channel outlet is arranged axially between the inlet section and the jacket section. The chord line has a chord length that may be restricted at one end by the channel inlet and at the other end by the channel outlet. The return channel has a first channel section and a second channel section. The first channel section extends between the jacket section and the compressor housing. The second channel section extends between the shell section and the inlet section. As a result, there are no flow obstacles in the first channel section. This means that there is always a gap between the jacket section and the compressor housing in the first duct section. In other words, the jacket section and the compressor housing are not in contact with the first channel section. To put it another way, the jacket section and the compressor housing are spaced apart from one another in the first duct section.

These features can lead to increased permeability of the return channel, ie flow disturbances are eliminated or at least reduced to a minimum, in particular in the first channel section. The feature of an unobstructed first channel section also means that the flow lines of the flow in the return channel are essentially parallel and describe a uniform solenoid at the beginning of the return channel, ie at least in the first channel section. This means that the turbulence / swirl of the flow can be freely formed in this area of the return duct and the vortex angle thereof can be changed in accordance with the compressor wheel speed. This means that the flow can freely and variably adapt its properties and move through without hindrance or hindrance according to the operating level at hand Can form ribs or the like. Furthermore, NVH advantages (NVH - Noise, Vibration and Harshness; noise, oscillations and roughness) can be achieved due to a more uniform flow. Overall, these features can improve the efficiency of the compressor or that of the ICE.

The return channel can be a substantially annular channel. The channel inlet and / or the channel outlet are also substantially annular. This means that the return channel extends along the chord line in a cross section of the compressor in a plane that is spanned by the axial direction and the radial direction, i.e. H. in a plane of a chordal cross-section. The jacket section and / or the inlet section are also substantially annular.

In a further aspect of the compressor, the first channel section can cover 50% to 95%, preferably 60% to 90% and most preferably 60% to 85%, of the chord length along the chord line from the channel inlet to the channel outlet. In particular, the first channel section can be any of the percentages of the chord length listed above along the chord line from an inlet opening of the channel inlet to the channel outlet, i.e. H. an outlet opening of the duct outlet. In a specific example, the first channel section may cover at least 75% of the chord length along the chord line from the channel inlet to the channel outlet. In another specific example, the first channel section may cover substantially 75% of the chord length from the channel inlet to the channel outlet. These features ensure that a certain percentage (in particular at least 50%) of the return channel does not have any flow obstacles, as a result of which the flow development in the return channel is improved. In other words, a certain channel length (i.e. chord length) of the return channel has no flow obstacles. Moreover, the fact that the beginning of the return channel has no obstacles up to a certain channel length (i.e. up to a certain percentage of the chord length or channel length) leads to a synergetic improvement in the flow development in the return channel. This is based on the findings of the present inventors that, particularly at the beginning of the return channel, a free development of the flow is more important than at the end. The beginning of the return channel is to be understood as the part of the return channel which begins at the channel inlet and continues to the channel outlet along the chord line. This is also the direction of flow when returning through the return channel. In other words, the beginning is to be regarded as a channel section that includes the channel inlet. The end is considered to be a return channel section including the channel outlet.

In a further aspect, which can be combined with the previous aspects, the return channel can extend in a substantially C-shape between the channel inlet and the channel outlet. This means that the chordal cross-section of the return channel can be essentially C-shaped. In other words, the course of the chord line can be essentially C-shaped. In particular, the shape of the return channel and / or the shape of the tendon cross-section and / or the shape of the course of the chord line is or are adapted to a “C”, but the lower leg of the “C” is cut away so that the upper leg and the lower legs have similarly oriented free ends; d. H. are essentially parallel.

In a further aspect which can be combined with any one of the preceding aspects, the jacket section can be attached to the inlet section in the region of the channel outlet. In addition, the jacket section can be attached to the inlet section in an axial direction. This means that the jacket section is arranged axially next to the inlet section. In other words, the fastening is arranged axially between the jacket section and the inlet section. This advantageously ensures that no fastening in a radial direction is required. Accordingly, no flow obstacles in the form of fastening elements which extend radially between the jacket section and the inlet section or radially between the jacket section and the compressor housing are required. Furthermore, an axial slot width of the channel outlet (see also the second slot width below) can be determined more precisely, since the fastening means can also be used as a spacer, i.e. H. a gap adjustment device, can serve. This is in contrast to prior art solutions in which the slot width is subject to die-casting tolerances, for example.

In a further aspect which can be combined with any one of the preceding aspects, the inlet insert can only be attached to the compressor housing via the inlet section. This means that there is no direct physical connection between the shell section and the compressor housing. In other words, the jacket section is only attached to the inlet section. This specific structural relationship advantageously leads to an unobstructed return channel in the area of the first channel section. In addition, the inlet section can comprise a flange section over which the inlet insert is attached to a flange portion of the compressor housing.

In a further aspect which can be combined with any of the preceding aspects, the compressor can furthermore comprise a sealing ring. The sealing ring can be arranged between the inlet section and the compressor housing. In addition, the sealing ring can be arranged between radially directed surfaces of the inlet section and the compressor housing. In particular, the sealing ring can be arranged between the flange section of the inlet section and the flange section of the compressor housing. In other words, the sealing ring can be arranged between a surface of the inlet section which is directed in a radially outward direction and a surface of the compressor housing which is directed in a radially inward direction. The sealing ring can be arranged coaxially with the inlet section and the compressor housing, that is to say with respect to the axial direction. The sealing ring can be configured as an O-ring, in particular a radial O-ring. An improved seal and improved coaxiality between the inlet insert ( 100 ) and the compressor housing.

In a further aspect that can be combined with any of the preceding aspects, the inlet insert can further comprise a fastening portion. The fastening section can be arranged axially between the inlet section and the jacket section. The fastening section can couple the inlet section and the jacket section to one another. In particular, the fastening section can firmly couple the inlet section and the jacket section to one another. The fastening section can extend in a substantially axial direction, preferably in a straight axial direction. For assembly purposes, however, an alignment that is slightly inclined away from the axial direction can be advantageous. In addition, the fastening section can be arranged at a slight distance from the channel outlet. This means that the attachment section along the chord line from the channel outlet to the channel inlet can be slightly spaced by 1% to 15%, preferably 2% to 10% and most preferably 3% to 5% of the chord length. In particular, the fastening section is from the outlet opening of the channel outlet along the chord line from the outlet opening of the channel outlet to the channel inlet, i.e. H. an inlet opening of the channel inlet, arranged slightly spaced. The flow behavior can be improved by the slight spacing of the fastening section from the channel outlet. For example, the flow coming through the return channel can be brought together again behind the fastening section towards the channel outlet. Furthermore, packaging constraints and performance can be optimized.

In a further aspect that can be combined with the previous aspects, the fastening section and the jacket section can be formed integrally together and can be fixed to the inlet section via the fastening section. Additionally or alternatively to this, the fastening section can be configured as an annular projection which extends from the jacket section in an axial direction to the inlet section. In this case, the fastening section can comprise at least two windows which extend over the circumference and form the channel outlet. In particular, the windows define the outlet opening of the duct outlet. The latter only applies if the fastening section is arranged directly on the duct outlet and not if the fastening section is spaced apart as defined in the preceding aspect. The windows can be fluidically connected, i. H. flush with the duct outlet, d. H. the annular outlet slot to allow an even flow out of the return channel. In other words, the fastening section extends axially upstream from the jacket section. Additionally or alternatively, the fastening section can comprise an external thread and can be screwed into an internal thread of the inlet section. Alternatively, the fastening section can be fastened, in particular fixed, to the inlet section by a press fit. The inlet section can therefore comprise an annular recess or an annular shoulder for receiving the fastening section.

As an alternative to the preceding aspects, the inlet section, the fastening section and the jacket section can be formed integrally together. Additionally or alternatively, the fastening section can comprise at least two webs. The webs can extend between the inlet section and the jacket section in an axial direction, so that at least two windows extending over the circumference are formed between the webs in a region of the channel outlet. In other words, the windows can form the duct outlet. The windows may be in fluid communication with the channel outlet to allow even flow out of the return channel. In addition, the webs between the inlet section and the jacket section can be distributed over the circumference. In addition, the webs can be evenly spaced apart. Additionally or alternatively, a cross section of the webs can be configured to be essentially teardrop-shaped. The teardrop shape can essentially be in be aligned in a circumferential direction. Furthermore, a radial outer surface of the web can wind radially inward. A radial inner surface of the web can extend essentially in a circumferential direction. An optimized flow profile can be provided. Furthermore, lower flow losses, more uniform flow and fewer flow disturbances can advantageously be achieved.

As an alternative to the previous aspects, the inlet section, the fastening section and the jacket section can be designed as separate parts. By forming the inlet insert with separate parts, there are fewer or no undercuts in the respective parts, which are easily malleable. A lighter surface treatment is also possible. A corresponding surface of the parts can be provided unmachined, machined with or without treatment. Furthermore, different material specifications are conceivable for each part, for example plastic, aluminum, steel alloys or any other suitable material.

In addition to the preceding aspect, the fastening section can comprise a plurality of screws distributed over the circumference that fasten the jacket section to the inlet section. In particular, the plurality of screws can comprise at least two, preferably three or more, preferably six, screws. In addition, the inlet section can comprise a plurality of first bores. The jacket section can comprise a plurality of second bores. The first and the second bores can be distributed accordingly in a circumferential direction to collectively receive a respective screw. In this context, the term "corresponding" means within the same circumferential distance; H. at the same circumferential positions so that they face each other. The number of first holes or the number of second holes can correspond to the number of screws. The first bores and the second bores may extend in the axial direction. Alternatively, the first bores and the second bores can extend inclined slightly away from the axial direction. As was explained further above, an orientation inclined slightly away from the axial direction can be advantageous for assembly purposes. In addition, the first bores can be configured as blind bores and the second bores can be configured as through bores. The screws can be inserted from and through the jacket section in an axial direction to the inlet section. This can provide a better seal to the outside. Alternatively, the first bores can be configured as through bores and the second bores can be configured as blind bores. The screws can be inserted from and through the inlet section in an axial direction to the jacket section. This can lead to fewer flow disturbances in the return channel, since no through-holes are necessary in the jacket section.

In addition to the previous aspects, the fastening section can comprise a plurality of spacers distributed over the circumference. The spacers can be arranged axially between the inlet section and the jacket section. The spacers can be arranged in respective depressions of the inlet section and of the jacket section. In addition, the spacers can be press-fitted into the recesses. Alternatively, the spacers can be formed integrally with the inlet section and / or the jacket section. In addition, a cross section of the spacers can be configured to be essentially teardrop-shaped. In particular, an outer contour of the cross section can be configured to be essentially teardrop-shaped. The teardrop shape can be oriented essentially in a circumferential direction. Furthermore, a radial outer surface of the spacer can wind radially inward. A radially inner surface of the spacer can extend substantially in a circumferential direction. An optimized flow profile to be provided. Lower flow losses, a more uniform flow and fewer flow disturbances can also advantageously be achieved. Additionally or alternatively, the spacers can be sleeve-shaped. One or more screws can extend through a respective spacer. This means that the spacers and the screws can be arranged in the same circumferential position and the spacer can serve as a shell or socket for the one or more screws.

In a further aspect, which can be combined with any of the preceding aspects relating to the fastening section, the fastening section can comprise a plurality of press-fit pins distributed over the circumference which fasten the jacket section to the inlet section. In addition, a cross section of the press fit pins may be configured to be substantially teardrop-shaped. In particular, an outer contour of the cross section can be configured to be essentially teardrop-shaped. The teardrop shape can be oriented essentially in a circumferential direction. In addition, a radially outer surface of the press fit pins can curl radially inward. A radially inner surface of the press fit pins may extend substantially in a circumferential direction. An optimized flow profile can be provided. Lower flow losses, a more uniform flow and fewer flow disturbances can also advantageously be achieved. Additionally or alternatively, the inlet section can comprise a plurality of first bores. The jacket section can comprise a plurality of second bores. The first and second bores are distributed accordingly in a circumferential direction to collectively receive a respective press-fit pin. In this context, the term "corresponding" means within the same circumferential distance; H. at the same circumferential positions so that they face each other. The first bores and the second bores may extend in the axial direction. The first bores and / or the second bores can be configured as blind bores. The number of first bores or the number of second bores can correspond to the number of press-fit pins. These aspects can advantageously result in reduced weight and a reduced number of parts in relation to e.g. B. lead the use of screws. Furthermore, possible outflow to the outside of the inlet insert and / or to the outside of the compressor housing through the bores can be prevented.

In a further aspect, which can be combined with any of the previous aspects relating to the fastening section, the fastening section can comprise an interference fit ring which fastens the jacket section to the inlet section. In addition, the inlet section can comprise a first annular groove and the jacket section can comprise a second annular groove. The first and second annular grooves may extend in the circumferential direction and may be arranged coaxially to collectively receive the interference fit ring. The first annular groove and the second annular groove can be recessed in the jacket section or in the inlet section in opposite axial directions. In other words, the press-fit ring can be received in the first annular groove and in the second annular groove in a press-fit manner and / or at least partially arranged therein. These aspects can advantageously result in reduced weight and a reduced number of parts with respect to e.g. B. the use of screws lead. Additionally or alternatively to this, the press-fit ring can comprise at least two windows extending over the circumference, which windows can be arranged in the region of the channel outlet. The windows may be fluidly connected to the channel outlet to allow uniform flow out of the return channel. In addition, respective webs of the press-fit ring can be arranged over the circumference between the windows. In addition, a cross section of the webs can be configured to be essentially teardrop-shaped. In particular, an outer contour of the cross section can be configured to be essentially teardrop-shaped. The teardrop shape can be oriented essentially in a circumferential direction. Furthermore, a radial outer surface of the web can wind radially inward. A radial inner surface of the web can extend essentially in a circumferential direction. An optimized flow profile can be provided. Lower flow losses, a more uniform flow and fewer flow disturbances can also advantageously be achieved.

In a further aspect that can be combined with any of the preceding aspects, the first channel section can comprise a diffuser region. The diffuser region may extend from the channel inlet along the chord line to the channel outlet. In addition, an area of an annular cross section of the return channel in a plane lying orthogonal to the chord line in the diffuser region along the chord line can increase in a direction from the channel inlet to the channel outlet. The diffuser area can be characterized by an area which at least remains constant or increases. This means that the area of the annular cross section is larger at the end of the diffuser area compared to the beginning of the diffuser area. In addition, the diffuser area can cover 50% to 95%, preferably 60% to 90% and most preferably 65% to 85%, of the chord length along the chord line from the channel inlet to the channel outlet. This means that the diffuser region can extend only along part of the first channel section, along the entire first channel section, or can extend further into the second channel section. The diffuser region can extend along 50% to 100%, preferably 60% to 90% and most preferably 65% to 85% of a first chord length range. The first chord length range is the range of the chord length along which the first channel section extends.

In a further aspect that can be combined with any of the preceding aspects, the compressor housing can define a first return surface of the return duct. The first return surface can extend between a first peripheral edge and a second peripheral edge of the compressor housing. In this context, “edges” generally need not represent sharp edges, but can be viewed as a type of marker line. In addition, the first return surface can define a radially outermost section of the return channel. Additionally or alternatively, a contour of the first Return surface have a differentiable course from the first peripheral edge to the second peripheral edge. In this context, the contour is to be regarded as a contour of the first return surface in a plane of the chordal cross section. “Differentiable” in this context also means (inter alia) that the contour of the first return surface has no gaps, interruptions, kinks or sharp edges (but edges in the sense of a marking). In addition or as an alternative to this, the second circumferential edge of the compressor housing can be arranged further radially outward than a radially furthest outward region of the casing section.

In a further aspect which can be combined with any one of the preceding aspects, the inlet section defines a second return surface of the return channel. The second return surface can extend between a first peripheral edge and a second peripheral edge of the inlet section. The jacket section can define a third return surface of the return channel. The third return surface can extend between a first peripheral edge and a second peripheral edge of the casing section.

In a further aspect which can be combined with the preceding two aspects, the return channel can be formed between the third return surface on one side and the first and the second return surface on an opposite side. This means that the third return surface can restrict the return channel to an inner side and the first and the second return surface can restrict the return channel to an outer side.

In a further aspect, which can be combined with any of the previous two aspects, a contour of the third return surface can have a substantially differentiable course from the first peripheral edge to the second peripheral edge of the jacket section. In addition, the second return surface can have a substantially differentiable course from the first peripheral edge to the second peripheral edge of the inlet section. In this context, the contour is to be regarded as a contour of the third return surface in a plane of the chordal cross section. Differentiable also means (inter alia) in this context that the contour of the third return surface has no gaps, interruptions, kinks or sharp edges (but edges in the sense of a marking). The course can be slightly interrupted by the second bores or the second annular groove. In the case of an interference fit ring, the ring, i. H. the windows can be shaped to the effect that the differentiable contour of the jacket section, i. H. the third return surface to restore.

In addition to the preceding aspect, the shell portion can include a third peripheral edge which is arranged on the third return surface. The third peripheral edge can be arranged between the first peripheral edge and the second peripheral edge. The third circumferential edge can define a radially outermost region of the jacket section. The third peripheral edge of the jacket section can be arranged radially inward of the second peripheral edge of the compressor housing. The third peripheral edge of the jacket section is not a sharp edge, but can be regarded as a kind of marking line. In addition, the third return surface can be shaped essentially elliptically between the first peripheral edge and the third peripheral edge. Additionally or alternatively, the third return surface can be shaped essentially circularly between the third peripheral edge and the second peripheral edge. Additionally or alternatively to this, the third peripheral edge of the jacket section can define an end of the diffuser area.

In a further aspect that can be combined with any of the preceding five aspects, the compressor housing can comprise a third peripheral edge. The third peripheral edge can be arranged on the first return surface between the first peripheral edge and the second peripheral edge. In addition, the third circumferential edge can define a radially outermost region of the first return surface. The third peripheral edge of the jacket section can be arranged radially inward of the third peripheral edge of the compressor housing. The third peripheral edge of the compressor housing is not a sharp edge, but can be viewed as a kind of marking line. In addition, the first return surface can be shaped essentially elliptically between the first peripheral edge and the third peripheral edge. In addition, the first return surface can be substantially circular in shape between the third peripheral edge and the second peripheral edge. Additionally or alternatively, the third circumferential edge of the compressor housing can define an end of the diffuser area.

In addition to the preceding two aspects, the third circumferential edge of the compressor housing and the third circumferential edge of the jacket section can be arranged at substantially the same axial positions.

In another aspect, that of any of the previous six aspects can be combined, the jacket section can comprise a compressor inlet surface. The compressor inlet surface can extend between the first peripheral edge and the second peripheral edge of the jacket section next to the third return surface. Furthermore, the compressor inlet surface can be essentially flush in an axial direction with corresponding surfaces of the inlet section and of the compressor housing axially upstream and axially downstream of the inlet surface, respectively.

In a further aspect which can be combined with any of the preceding aspects, the return channel can comprise a nozzle area. In addition, and in aspects including a diffuser area, the nozzle area may be formed along the chord line behind the diffuser area in a direction from the channel inlet along the chord line to the channel outlet. In addition, the second channel section can comprise the nozzle area. Additionally or alternatively, the nozzle area can begin at the third peripheral edge of the jacket section. In addition, an area of the annular cross-section of the return channel in a plane running orthogonal to the chord line in the nozzle area can decrease along the chord line in a direction from the channel inlet to the channel outlet. The nozzle area can be characterized by an area which at least remains constant or decreases. This means that the area of the annular cross section at the end of the nozzle area is reduced compared to the beginning of the nozzle area.

In a further aspect which can be combined with any of the preceding aspects, the channel outlet can be arranged axially upstream of the channel inlet.

In a further aspect that can be combined with any of the preceding aspects, the compressor can furthermore comprise a compressor wheel. The compressor wheel can be rotatably arranged in the compressor housing. The compressor wheel may further include a leading edge. The leading edge may be located axially upstream of the channel inlet.

In a further aspect which can be combined with any one of the preceding aspects, the channel inlet can have an annular inlet slot with a first slot width. The first slot width can be defined by the smallest distance between the compressor housing and the jacket section in a direction running orthogonally to the chord line. The first slot width can be determined by an axial distance between the inlet section and the jacket section. The annular inlet slot can extend substantially 360 ° along the circumference without interruptions. In other words, the annular inlet slot is defined between the first and third return surfaces. In addition, the annular inlet slot can be inclined from the radial direction to an axial direction from the inlet section to the jacket section at an angle α, where 20 ° α 50 °, preferably 25 ° α 45 ° and most preferably 30 ° ≤ α ≤ 40 °. In specific examples, the angle α can be 35 °.

In a further aspect that can be combined with any of the preceding aspects, the channel outlet can have an annular outlet slot with a second slot width. The second slot width can be defined by the smallest distance between the inlet section and the jacket section in a direction orthogonal to the chord line. The second slot width can be determined by an axial distance between the inlet section and the jacket section. This means that the second slot width can be set variably as a function of the axial height of a part of the fastening section which remains directly axially between the inlet section and the jacket section. The annular outlet slot extends substantially 360 ° along the circumference without interruptions, with the exception of, if applicable, fastening portions or elements thereof. In other words, the annular outlet slot is defined between the second and third return surfaces. In addition, the annular outlet slot can be inclined from the radial direction to an axial direction from the inlet section to the jacket section at an angle β, where 10 ° β 40 °, preferably 15 ° β 35 ° and most preferably 20 ° ≤ β ≤ 30 °. In specific examples, the angle α can be 25 °.

The invention also relates to a charging device. The charging device comprises a drive unit, a shaft and a compressor according to one of the preceding aspects. The compressor is rotatably coupled to the drive unit via the shaft. In addition, the drive unit can comprise a turbine wheel and / or an electric motor.

Figure list

• 1A Figure 12 shows an exploded view of the compressor with the inlet insert;
• 1B FIG. 13 shows a side sectional view of the compressor with the inlet insert of FIG 1 in an assembled state;
• 1C FIG. 13 shows the shell portion and the mounting portion of the compressor of FIG 1 in an isometric view;
• 2 represents two different mounting directions of the mounting portion of the assembled compressor of FIG 1 in a side sectional view opposite;
• 3A-3C FIG. 3 shows three different configurations of the fastening section comprising screws together with the jacket section of the compressor of FIG 1 ;
• 4A shows two different configurations of the fastening portion, comprising press fit pins and a press fit ring, respectively, in a side sectional view;
• 4B FIG. 13 shows a detailed section of the press fit pins and shell portion of FIG 4A along section line A: A;
• 4C FIG. 11 shows a detailed section of the interference fit ring and skirt portion of FIG 4A along section line A: A;
• 5 contrasts two different configurations of the fastening portion formed integrally with the shell portion in a side sectional view of the assembled compressor;
• 6A-6D show various views of the compressor with an inlet insert which has the fastening section, the jacket and the inlet section formed integrally with one another;
• 7th Figure 12 shows a side sectional view of the supercharger with a compressor including the inlet insert.

Detailed description

In the context of the present invention, the terms axial, axial or axial direction mean a direction which runs parallel to or along an axis of the compressor, ie the axis of rotation of the compressor wheel which is fastened in the compressor housing. With reference to the figures, see in particular 1B , 2 , 4A , 5 , 6B , 6C and 7th , thus becomes an axial dimension with the reference number 22nd described a radial dimension that is "radially" different from the axial dimension 22nd extends away is denoted by the reference number 24 described. Furthermore, a circumferential dimension becomes around the axial dimension 22nd around with the reference number 26th described.

The term "tendon line" 202 is as an imaginary line in a cross section of the compressor 300 coming from the radial direction 24 and the axial direction 22nd is stretched to interpret. An area of the return duct 200 This cross section is also referred to below as a chord cross section 264 designated. The tendon line 202 , ie the imaginary line or imaginary center line, extends between opposite surfaces of the jacket section 120 and the compressor housing 310 or opposite surfaces of the jacket section 120 and the inlet section 110 (see for example the dashed line in 1B , 2 , 4A , 5 , 6B) . Here is the chord line 202 from the respective opposite surface of the shell section 120 and the compressor housing 310 evenly spaced and from the respective opposite surface of the shell section 120 and the inlet section 110 evenly spaced. In other words, the chordal line 202 as a center line running through the center of the return channel 200 extends, to be interpreted. That means the tendon line 202 a center line of the return duct 200 is.

In the context of the present invention, the terms “upstream” and “downstream” should be related to the main direction of flow of fluids through the compressor housing. That is, “upstream” refers to a side / direction against the flow path of air through the compressor, where “downstream” refers to a side / direction in the flow path of air through the compressor. For example, in 5 the compressor wheel 320 downstream of the inlet insert 110 arranged.

1 illustrates an exemplary embodiment of a compressor 300 for a charger 400 according to the present invention. The inventive compressor 300 includes an inlet insert 100 and a compressor housing 310 with a flange portion 314 . The inlet insert 100 includes an inlet section 110 , a jacket section 120 and an attachment portion 130 . The inlet section 110 includes a flange portion 114 over which the inlet insert 100 on the compressor housing 310 , ie at the flange portion 314 of the compressor housing 310 , is attached. That means the inlet insert 100 only through the inlet section 110 on the compressor housing 310 is attached while the jacket section 120 only over the fastening section 130 at the inlet section 110 is attached. This means that there is no direct physical connection or direct physical contact between the jacket section 130 and the compressor housing 310 there (see for example the assembled compressor 300 in 1B) . This specific structural relationship advantageously leads to an unobstructed return channel 200 in the area between the compressor housing 310 and the jacket section 120 .

Referring now to FIG 1B it can be seen that this return channel 200 between the inlet insert 100 and the compressor housing 310 is trained. The return channel 200 extends along a chord line 202 from a duct inlet 210 to a duct outlet 220 . The tendon line 202 is in 1B (also in 2 , 4A , 5 , 6B) shown schematically by the dashed line. The canal inlet 210 is axially between the shell section 120 and the compressor housing 310 arranged. The duct outlet 220 is axially between the inlet section 110 and the jacket section 120 arranged. That means the canal inlet 210 downstream of the channel outlet 220 is arranged. This allows fluids from the channel inlet 210 through the return channel 200 to the upstream channel outlet 220 stream. The tendon line 202 exhibits a chord length 203 on that from the duct inlet 210 at one end and the duct outlet 220 is restricted at the other end. This is indicated by the arrows at the respective ends of the dashed chord line 202 shown schematically. The return channel 200 has a first channel section 200a and a second channel section 200b on. The first channel section 202a extends between the shell section 120 and the compressor housing 310 . The second channel section 200b extends between the shell section 120 and the inlet section 110 . The first channel section 200a no flow obstacles. This means that there is always a gap between the jacket section 120 and the compressor housing 310 in the first channel section 200a gives. In other words, the jacket section 120 and the compressor housing 310 not with the first channel section 200a in contact. To put it another way are the jacket section 120 and the compressor housing 310 in the first channel section 200a spaced from each other.

These features can increase the permeability of the return channel 200 lead, ie flow disturbances are eliminated or at least reduced to a minimum, in particular in the first channel section 200a . The feature of an unobstructed first channel section 202a also leads to the fact that flow lines of the flow in the return channel 200 are essentially parallel and have a uniform solenoid at the beginning of the return channel 200 , ie at least in the first channel section 202a , describe. This means that in this area of the return duct 200 the vortex / swirl of the flow can be freely formed and the vortex angle thereof can be changed according to the compressor wheel speed. This means that the flow can freely and variably adapt its properties and can form according to the operating stage without hindrance or hindrance by ribs or the like. Furthermore, NVH advantages (NVH - Noise, Vibration and Harshness; noise, oscillations and roughness) can be achieved due to a more uniform flow. These characteristics can overall increase the efficiency of the compressor 300 or those of the ICE in which the compressor 300 can be used to improve.

The return channel 300 is a substantially annular channel. The canal inlet 210 and / or the duct outlet 220 are also substantially annular. That means that the return channel 200 along the tendon line 202 in a cross section of the compressor 300 in a plane extending from the axial direction 22nd and the radial direction 24 is spanned, ie in a plane of the above-mentioned chord cross section 264 , extends. The tendon cross section 264 is indicated by the hatched area in the return channel 200 from 1B shown. This means that, as an exception, this hatched area does not represent a section through solid material. The jacket section 120 and / or the inlet section 110 are also substantially annular.

In the examples of 1B , 2 , 4A and 5 covers the first channel section 200a about 75% of the chord length 203 along the tendon line 202 from the duct inlet 210 to the duct outlet 220 from. In the example of 6A to 6D covers the first channel section 200a about 90% of the chord length 203 along the tendon line 202 from the duct inlet 210 to the duct outlet 220 from. In all examples, the first channel section 200a however, alternatively, 50% to 95%, preferably 60% to 90%, and most preferably 65% to 85%, of the chord length 203 along the tendon line 202 from the duct inlet 210 to the duct outlet 220 cover. In particular, the first channel section 202a any of the percentages of chord length given above 203 along the tendon line 202 from an inlet port 216 of the duct inlet 210 to the duct outlet 220 , ie an outlet opening 226 of the duct outlet 220 , cover. See for example the inlet port 216 and the outlet port 226 in 1B . These features ensure that a certain percentage, in particular at least 50%, of the return duct 200 has no flow obstacles, whereby the flow development in the return channel 200 is improved. In other words, it has a certain canal length (ie the chord length 203 ) of the return duct 202 no flow obstacles. In addition, the fact that the beginning of the return channel leads 200 up to a certain canal length (ie up to a certain percentage of the chord length 203 or channel length) has no obstacles to a synergetic improvement of the Flow development in the return channel 200 . This is based on the findings of the present inventor, especially at the beginning of the return channel 200 a free development of the current is more important than at the end. Below the beginning of the return channel 200 is the part of the return duct 200 , which starts at the canal inlet and continues to the canal outlet along the chord line. This is also the direction of the (lateral) flow when returning through the return channel 200 . In other words, the beginning is as a channel section, which is the channel inlet 210 includes to look at. The end is analogous as a return duct section that is the duct outlet 220 includes to look at.

As in 1B is shown, the return channel extends 200 essentially C-shaped between the channel inlet 210 and the duct outlet 220 . That means that the tendon cross section 264 of the return duct 200 is essentially C-shaped. In other words, it is the course of the chord line 202 essentially C-shaped. In particular, the shape of the return channel 200 , the shape of the tendon cross-section 264 and the shape of the course of the chord line 202 adjusted to a "C". However, the lower leg of the “C” is cut away and / or bent so that the upper leg and the lower leg have similarly oriented free ends, ie are essentially parallel.

As mentioned above, the jacket section is 120 in the area of the duct outlet 220 at the inlet section 110 attached (see 1B , 2 , 4A , 5 , 6B , 6C and 7th ). The jacket section 120 is in an axial direction 22nd at the inlet section 110 attached. That means the jacket section 120 axially adjacent to the inlet section 110 is arranged. In other words, the fastening section is 130 axially between the jacket section 120 and the inlet section 110 arranged. That means the jacket section 120 not directly axially next to the inlet section 110 is arranged as the fastening portion 130 is arranged in between. The jacket section 120 however, is axially downstream of the inlet section 110 arranged. This advantageously ensures that no fastening element (ie element of the fastening section 130 ) in a radial direction 24 , ie radially next to the jacket section 120 , is required. As a result, there are no flow obstacles in the form of fastening elements which are located radially between the jacket section 120 and the inlet section 110 and / or radially between the jacket section 120 and the compressor housing 310 extend, required. Furthermore, an axial slot width of the channel outlet 220 (see second slot width 224 which will be explained later) can be determined more precisely because the attachment portion 130 can also serve as a spacer, ie a gap adjuster. This is in contrast to prior art solutions in which the slot width is subject to die-casting tolerances, for example.

As exemplified by 1B is explained, but applies to all examples, includes the compressor 300 also a sealing ring 152 . The sealing ring 152 is between the inlet section 110 and the compressor housing 310 arranged. Here is the sealing ring 152 between radially directed surfaces of the inlet section 110 and the compressor housing 310 arranged. In particular, the sealing ring 152 between the flange portion 114 of the inlet section 110 and the flange portion 314 of the compressor housing 310 arranged. In other words, is the sealing ring 152 between a surface of the inlet section 110 that are in an outward radial direction 24 is directed, and a surface of the compressor housing 310 that is in an inward radial direction 24 is directed, arranged. The sealing ring 152 is coaxial with the inlet section 110 and the compressor housing 310 , ie with respect to the axial direction 22nd , arranged. The sealing ring is configured as an O-ring, in particular a radial O-ring. This can result in improved sealing and improved coaxiality between the inlet insert 100 and the compressor housing 310 be achieved.

As mentioned above, the inlet insert comprises 100 furthermore a fastening section 130 , which is described in more detail below and with reference to all examples, unless explicitly mentioned otherwise. The fastening section 130 is axially between the inlet section 110 and the jacket section 120 arranged. The fastening section couples 130 the inlet section 110 and the jacket section 120 to each other. In particular, the fastening section couples 130 the inlet section 110 and the jacket section 120 rigid, especially tight, to one another. The fastening section 130 extends in a straight axial direction 22nd . For assembly purposes, however, it may be slightly off the axial direction 22nd an inclined orientation would be an advantage and also possible. The fastening section 130 is at a slight distance from the duct outlet 220 arranged (see for example 1B , 2 , 4A) .

That means the fastening section 130 along the tendon line 202 from the duct outlet 220 to the duct inlet 210 by about 4% ± 1% of the chord length 203 is slightly spaced. In alternative configurations, the attachment portion 130 along the tendon line 202 from the duct outlet 220 to the duct inlet 210 by 1% to 15%, preferably 2% to 10%, and most preferably 3% to 5%, of the chord length 203 be slightly spaced. In particular, the fastening section 130 from the outlet port 226 of the duct outlet 220 along the tendon line 202 from the outlet port 226 of the duct outlet 220 to the duct inlet 210 , ie an inlet port 216 of the duct inlet 210 , arranged slightly spaced. Due to the slight spacing of the fastening section 130 from the duct outlet 220 the flow behavior can be improved. For example, through the return channel 200 incoming flow behind the fastening section 130 to the duct outlet 220 to be brought together again. Furthermore, packaging constraints and performance can be optimized. However, particularly in examples where the jacket portion 120 and the attachment portion 130 or in which the jacket section 120 , the fastening section 130 and the inlet section 110 are integrally formed with each other, the fastening portion 130 alternatively, not from the duct outlet 220 be spaced. These are the following in the description that refer to 5 and 6A to 6D relates to find further explanations.

The following sections introduce three different embodiments of the compressor 300 the other configurations and sub-configurations with regard to the inlet insert 100 and in particular the fastening section 130 exhibit. Accordingly, an embodiment in which the inlet section 110 , the fastening section 130 and the jacket section 120 are designed as separate parts, referred to as the first embodiment. The second embodiment describes an inlet insert 100 , wherein the fastening portion 130 and the jacket section 120 are formed integrally with each other, while in the third embodiment the fastening portion 130 , the jacket section 120 and the inlet portion are integrally formed with each other.

Various configurations of the first embodiment are shown in FIG 1A to 1C , 2 , 3A to 3C and 4A to 4C shown. By forming the inlet insert 100 with separate parts there are fewer or no undercuts in the respective parts, which are therefore easy to shape. A lighter surface treatment is also possible. A corresponding surface of the parts can be provided unmachined, machined with or without treatment. Furthermore, different material specifications are conceivable for each part, for example plastic, aluminum, steel alloys or any other suitable material or any combination thereof.

The first embodiment includes three main configurations. A first configuration in which the attachment portion 130 Screws 136 includes (see 1A to 1C , 2 , 3A to 3C ), a second configuration in which the attachment portion 130 Press fit pins 137 includes (see 4A and 4B) and a third configuration in which the attachment portion 130 an interference fit ring 139 includes (see 4A and 4C ).

As already mentioned, the fastening section comprises 130 According to the first configuration of the first embodiment, a plurality of screws distributed over the circumference 136 (see for example 1A and 1C ). The screws 136 attach the jacket section 120 at the inlet section 110 . In particular, the multiple screws 136 six screws (see for example 1A and 1C ). In other examples, the multiple screws 136 but also at least two screws 136 , in particular exactly two screws 136 , (see for example 3C ), preferably three screws 136 (see for example 3A) , include. The inlet section 110 includes several first holes 116 . The jacket section 120 includes several second holes 126 . The first and second holes 116 , 126 are in a circumferential direction to that effect 26th distributed accordingly, a respective screw together 136 include (see for example 1B and 2 ). In this context, the term “corresponding” means at the same circumferential distance, that is, at the same circumferential positions so that they are opposite one another. The extensive distribution of the second holes 126 is best in 1A and 1C to see. The number of first holes 116 or the number of second holes 126 corresponds to the number of screws 136 . The first drilling 116 and the second holes 126 extend in the axial direction 22nd . In alternative examples (not shown) the first holes 116 and the second holes 126 slightly from the axial direction 22nd extend inclined. As explained above, one may be slightly off the axial direction 22nd tilted alignment for assembly purposes can be advantageous.

2 shows that the screws 136 from and through the jacket section 120 in an axial direction 22nd to the inlet section 110 can be introduced (left side of 2 ), or the screws 136 can from and through the inlet section 110 in an axial direction 22nd to the jacket section 120 be introduced (right side of 2 ). There are the first holes 116 configured as blind holes and the second holes 126 are configured as through holes (left side of 2 ). In the example the right side of 2 are the first holes 116 configured as through holes and the second holes 126 are configured as blind holes. These two options can be combined, for example some of the multiple screws 136 be inserted alternately from one side and the rest of the several screws 136 could be inserted from an opposite side. However, it is preferred that all of the plurality of screws 136 be introduced from the same side. That means that preferably all first holes 116 are configured the same and all other holes 126 are configured the same. The left side sub-configuration of 2 can provide a better seal to the outside. The right side sub-configuration of 2 can lead to fewer flow disturbances in the return channel 200 lead, as there are no through holes in the jacket section 120 are necessary.

The fastening section also comprises 130 According to the first configuration of the first embodiment, a plurality of spacers distributed over the circumference 138 (see for example 1A and 1C ). The spacers 138 are axially between the inlet section 110 and the jacket section 120 arranged. The spacers 138 are in the respective wells 116a , 126a of the inlet section 110 and the jacket section 120 arranged. The depressions 116a of the inlet section 110 surround the first holes 116 (see for example 2 ). The depressions 126a of the jacket section 120 surround the second holes 126 (see for example 1A and 2 ). The spacers 138 are in the respective wells 116a , 126a press fit. In alternative examples, the spacers could 138 also with the inlet section 110 or the jacket section 120 be integrally formed. In alternative embodiments, the spacers 138 also over the circumference between two adjacent first bores 116 (or second holes 126 ) be arranged. In some sub-configurations there is a cross-section 138a the spacer 138 configured essentially drop-shaped and / or flow-optimized (see for example 3C ). In particular, an outer contour of the cross section 138a be configured essentially teardrop-shaped. The teardrop shape can be substantially in a circumferential direction 26th be aligned. Furthermore, a radial outer surface of the spacer can be 138 wind radially inwards. A radially inner surface of the spacer 138 can move essentially in a circumferential direction 26th extend or may extend to the radially outer surface along a longitudinal axis of the spacer 138 be mirrored. An optimized flow profile can be provided. Lower flow losses, a more uniform flow and fewer flow disturbances can also advantageously be achieved. Generally the spacers are 138 sleeve-shaped. It extends through each spacer 138 a respective screw 136 (see for example 2 and 3A to 3C ). That means the spacers 138 and the screws 136 are arranged at the same circumferential position and the spacer 138 as a shell or socket for the screws 136 can serve. The number of spacers 138 however, it does not have to be the number of screws 136 correspond. For example, only every second screw 136 by a spacer 138 extend (see for example 1A to 1C and 3A) .

As already mentioned, the fastening section comprises 130 According to the second configuration of the first embodiment, a plurality of press-fit pins distributed over the circumference 137 . This second configuration is combined with the third configuration in one figure (see 4A) . The left side of 4A the second configuration with interference fit pins 137 , and the right side of 4A describes the third configuration with an interference fit ring 139 . Also shown are respective detailed views along section line A: A for the second configuration showing only the press fit pins 137 and the jacket section 120 show (see 4B) and for the third configuration which is just the interference fit ring 139 and the jacket section 120 show (see 4C ) provided.

The press fit pins 137 attach the jacket section 120 at the inlet section 110 . Therefore, the inlet section comprises 110 several first holes 116 , and the jacket section 120 includes several second holes 126 , similar to the first configuration. The first and second holes 116 , 126 are in a circumferential direction 26th distributed accordingly, a respective press fit pin together 137 record. In this context, the term “corresponding” means at the same circumferential distance, that is, at the same circumferential positions so that they are opposite one another. The number of first holes 116 and the number of second holes 126 each correspond to the number of press fit pins 137 . The first drilling 116 and the second holes 126 extend in the axial direction 22nd . The first drilling 116 and the second holes 126 are configured as blind holes (see 4A) . A cross section 137a the press fit pins 137 is configured essentially teardrop-shaped. In particular, an outer contour of the cross section 137A is configured to be essentially teardrop-shaped. The teardrop shape can be substantially in a circumferential direction 26th be aligned. Furthermore, a radial Outer surface of the press fit pins 137 wind radially inwards. An inner radial surface of the press fit pins 137 can move essentially in a circumferential direction 26th extend (see 4B) . An optimized flow profile can be provided. Lower flow losses, a more uniform flow and fewer flow disturbances can also advantageously be achieved. These aspects can advantageously result in reduced weight and a reduced number of parts in relation to e.g. B. the use of screws 136 to lead. Furthermore, possible outflow to the outside of the inlet insert can occur 100 and / or to the outside of the compressor housing 310 prevented by the holes.

The third configuration of the first embodiment with the press fit ring 139 is in 4A and 4C shown. The press fit ring 139 fastens the jacket section 120 at the inlet section 110 . Therefore, the inlet section comprises 110 a first ring groove 119 and the jacket section 120 includes a second annular groove 129 . The first and the second ring groove 119 , 129 extend in the circumferential direction 26th and are coaxially arranged to that effect, collectively the interference fit ring 139 record. The first ring groove 119 and the second ring groove 129 are in the jacket section 120 or in the inlet section 110 in opposite axial directions 22nd deepened. In other words, is the interference fit ring 139 in the first ring groove 119 and in the second ring groove 129 received together press-fit and at least partially arranged therein. These aspects can advantageously result in reduced weight and a reduced number of parts with respect to e.g. B. the use of screws 136 to lead. The press fit ring 139 includes four circumferential windows 132 (please refer 4A and C. ). The window 132 are in the area of the duct outlet 220 arranged, in particular slightly from the channel outlet 220 spaced as explained above. The window 132 are related to the duct outlet 220 flow-connected, a uniform flow from the return channel 200 to allow beyond. The press fit ring 139 also includes four webs 134 running across the perimeter between the windows 132 are arranged. In other examples, the number of ridges 134 or the number of windows 132 more or less than four, but preferably at least two and necessarily at least one. A cross section 134a the webs 134 is configured essentially drop-shaped (not shown for this first embodiment, but analogous to the webs 134 the third embodiment in 6D ). In particular, there is an outer contour of the cross section 134a configured essentially teardrop-shaped. The teardrop shape is substantially in a circumferential direction 26th aligned. Furthermore, a radial outer surface of the web winds 134 radially inwards. A radially inner surface of the web 134 extends essentially in a circumferential direction. An optimized flow profile can be provided. Lower flow losses, a more uniform flow and fewer flow disturbances can also advantageously be achieved. Alternatively, and as in 4C is shown, the cross-section 134a the webs 134 simply the shape of the rest of the interference fit ring 139 resemble.

The second embodiment in which the fastening portion 130 and the jacket section 120 are integrally formed with each other is in 5 shown. The jacket section 120 so is about the attachment section 130 at the inlet section 110 fixed. With regard to the details of the attachment, two different configurations of this second embodiment are shown in FIG 5 united. The left side of 5 Fig. 13 shows a first configuration of the second embodiment in which the attachment portion 130 by a threaded connection on the inlet section 110 is attached. The fastening section 130 thus includes an external thread 131 and is in an internal thread 111 of the inlet section 110 screwed. The internal thread 111 is on an annular shoulder 118 of the inlet section 110 intended. In alternative examples, the external thread could 131 also at the inlet section 111 be arranged, and the internal thread 111 could also be attached to the fastening section 130 be arranged. The right side of 5 Fig. 13 shows a second configuration of the second embodiment in which the attachment portion 130 by interference fit at the inlet section 110 attached, in particular fixed thereto, is. The inlet section 110 therefore includes an annular shoulder 118 for receiving the fastening section. In other exemplary configurations, the inlet section 110 alternatively, an annular recess similar to the first annular groove 119 as explained above.

The fastening portion applies to both configurations of the second embodiment 130 as an annular projection extending from the shell portion 120 in an axial direction 22nd to the inlet section 110 extends, configured. The fastening section 130 four circumferential windows 132 include (see 5 , only one visible at a time). The window 132 form the duct outlet 220 . In particular, define the windows 132 the outlet opening 226 of the duct outlet 220 . The latter only applies if the fastening section 130 directly at the duct outlet 220 is arranged (see 5 ) and not if the fastening section 130 is spaced (not shown here) as in connection with of the first embodiment will be explained. The window 132 are flow-connected, ie flush with the duct outlet 220 , ie the annular outlet slot 222 of the duct outlet 220 (as explained further below) to ensure an even flow out of the return duct 200 to allow. In other words, the fastening section extends 130 axially upstream of the shell section 120 . The fastening section 130 also includes four webs 134 running across the perimeter between the windows 132 are arranged. The specifications of the bars 134 , which are explained above with regard to the first embodiment, also apply to the webs 134 this second embodiment.

The third embodiment, in which the inlet portion 110 , the jacket section 120 and the attachment portion 130 are integrally formed with each other is in 6A to 6D shown in more detail. The fastening section is more precise 130 similar to the fastening section 130 the second embodiment and the interference fit ring 139 of the first embodiment, the main difference being that it is configured with the shell portion 120 as well as with the inlet section 110 is firmly connected. The fastening portion thus comprises 130 also four bridges 134 . The bridges 134 extend between the inlet section 110 and the jacket section 120 in an axial direction 22nd so that there are four circumferential windows 132 between the webs 134 in the area of the duct outlet 220 are formed. In other words, the windows form 132 the duct outlet 220 . The window 132 are related to the duct outlet 220 flow-connected, a uniform flow from the return channel 200 to allow beyond. The bridges 134 are distributed over the perimeter. There are the webs 134 evenly spaced apart. In alternative examples, the webs 134 also be distributed unevenly spaced. A cross section 134a the webs 134 is essentially teardrop-shaped (see 6D ). The teardrop shape is substantially in a circumferential direction 26th aligned. Furthermore, a radial outer surface of the web winds 134 radially inwards. A radially inner surface of the web 134 extends essentially in a circumferential direction 26th . This enables an optimized flow profile to be provided. Lower flow losses, a more uniform flow and fewer flow disturbances can also advantageously be achieved. In other examples, the number of bars 134 or the number of windows 132 more or less than four, but preferably at least two and necessarily at least one.

• Der erste Kanalabschnitt 200a umfasst einen Diffusorbereich 204 (siehe beispielsweise 1B und 5). Der Diffusorbereich 204 erstreckt sich von dem Kanaleinlass 210 entlang der Sehnenlinie 202 zu dem Kanalauslass 220. Dabei nimmt eine Fläche eines ringförmigen Querschnitts 262 des Rückführungskanals 200 in dem Diffusorbereich 204 entlang der Sehnenlinie 202 in einer Richtung von dem Kanaleinlass 210 zu dem Kanalauslass 220 zu. Der ringförmige Querschnitt 262 wird in 5 schematisch angegeben und stellt einen Querschnitt durch den Rückführungskanal 200 in einer orthogonal zu der Sehnenlinie 202 laufenden Ebene dar. An den meisten Positionen entlang der Sehnenlinie 202 weist diese Ebene, d. h. der Querschnitt, eine konische Form auf (beispielsweise der beispielhafte ringförmige Querschnitt 264 in 5). An der Grenzposition zwischen dem Verdichtergehäuse 310 und dem Einlasseinsatz 110 in 5 liegt die oben erwähnte Ebene und somit auch der ringförmige Querschnitt 264 in einer radialen Ebene. Der Diffusorbereich 204 wird durch eine Fläche, die entlang der Sehnenlinie 202 zumindest konstant bleibt oder zunimmt, gekennzeichnet. Das bedeutet, dass die Fläche des ringförmigen Querschnitts 262 an dem Ende des Diffusorbereichs 204 im Vergleich zum Anfang des Diffusorbereichs 204 größer ist. Beispielsweise deckt der Diffusorbereich 204 in dem Beispiel von 1B, 2 und 5 etwa 75 % der Sehnenlänge 203 entlang der Sehnenlinie 202 von dem Kanaleinlass 210 zu dem Kanalauslass 220 ab. In allen Beispielen kann der Diffusorbereich 204 jedoch alternativ dazu 50 % bis 95 %, vorzugsweise 60 % bis 90 % und am stärksten bevorzugt 65 % bis 85 %, der Sehnenlänge 203 entlang der Sehnenlinie 202 von dem Kanaleinlass 210 zu dem Kanalauslass 220 abdecken. Das bedeutet, dass sich der Diffusorbereich 204 nur entlang einem Teil des ersten Kanalabschnitts 202a, entlang dem gesamten ersten Kanalabschnitt 202a erstrecken kann oder sich weiter in den zweiten Kanalabschnitt 200b erstrecken kann. In dem Beispiel von 1B, 2 und 5 erstreckt sich der Diffusorbereich 204 entlang etwa 100 % eines ersten Sehnenlängenbereichs 203a. In allen Beispielen kann sich der Diffusorbereich 204 jedoch alternativ dazu entlang 50 % bis 100 %, vorzugsweise 60 % bis 90 % und am stärksten bevorzugt 65 % bis 85 % des ersten Sehnenlängenbereichs 203a erstrecken. Der erste Sehnenlängenbereich 203a ist dabei der Bereich der Sehnenlänge 203, entlang dem sich der erste Kanalabschnitt 202a erstreckt (siehe 2). Der Diffusorbereich führt zu einem verbesserten Strömungsverhalten in den Rückführungskanal 200.

The following aspects again relate to all of the previously illustrated embodiments, although they may be explained with only one illustrative figure:

• The first channel section 200a includes a diffuser area 204 (see for example 1B and 5 ). The diffuser area 204 extends from the channel inlet 210 along the tendon line 202 to the duct outlet 220 . It takes up an area of an annular cross-section 262 of the return duct 200 in the diffuser area 204 along the tendon line 202 in a direction from the channel inlet 210 to the duct outlet 220 to. The annular cross section 262 is in 5 indicated schematically and represents a cross section through the return channel 200 in an orthogonal to the chord line 202 along the chord line at most positions 202 if this plane, ie the cross section, has a conical shape (for example the exemplary annular cross section 264 in 5 ). At the boundary position between the compressor housing 310 and the inlet insert 110 in 5 lies the above-mentioned plane and thus also the annular cross-section 264 in a radial plane. The diffuser area 204 is represented by an area running along the chord line 202 at least remains constant or increases. That means that the area of the annular cross-section 262 at the end of the diffuser area 204 compared to the beginning of the diffuser area 204 is bigger. For example, the diffuser area covers 204 in the example of 1B , 2 and 5 about 75% of the chord length 203 along the tendon line 202 from the duct inlet 210 to the duct outlet 220 from. In all examples, the diffuser area 204 however, alternatively 50% to 95%, preferably 60% to 90%, and most preferably 65% to 85%, of the chord length 203 along the tendon line 202 from the duct inlet 210 to the duct outlet 220 cover. That means that the diffuser area 204 only along part of the first channel section 202a , along the entire first channel section 202a may extend or further into the second channel section 200b can extend. In the example of 1B , 2 and 5 extends the diffuser area 204 along about 100% of a first chord length range 203a . In all examples, the diffuser area can be 204 however, alternatively along 50% to 100%, preferably 60% to 90%, and most preferably 65% to 85% of the first chord length range 203a extend. The first range of chord length 203a is the range of the chord length 203 along which the first channel section 202a extends (see 2 ). The diffuser area leads to an improved flow behavior in the return channel 200 .

Referring again to FIG 1B and 6B becomes the geometry of the return duct 200 further specified. The return channel 200 has a first return surface 230 , a second return surface 240 and a third return surface 250 on. The first return surface 230 is from the compressor housing 310 defines the second return surface 240 is from the inlet section 110 defined, and the third return surface 250 is from the jacket section 120 Are defined. The first return surface 230 extends between a first peripheral edge 312a and a second peripheral edge 312b of the compressor housing 310 . The second return surface 240 extends between a first peripheral edge 112a and a second peripheral edge 112b of the inlet section 110 . The third return surface 250 extends between a first peripheral edge 122a and a second peripheral edge 122b of the jacket section 120 . In this context, “edges” generally need not represent sharp edges, but can be viewed as a type of marker line.

The first return surface 230 defines a radially outermost portion of the return duct 200 (see for example 1B and 6B) . A contour of the first return surface has here 230 a differentiable course from the first peripheral edge 312a to the second peripheral edge 312b on. In this context, the contour is a contour of the first return surface 230 in one plane of the tendon cross-section 264 consider. “Differentiable” also means (inter alia) in this context that the contour of the first return surface 230 has no gaps, interruptions, kinks or sharp edges (but edges in the sense of a marking). The second peripheral edge 312b of the compressor housing 310 is farther radially outward than a radially outermost region of the jacket section 120 arranged.

The return channel 200 is therefore between the third return surface 250 on one side and the first and second return surfaces 230 , 240 formed on an opposite side. That means that the third return surface 250 the return channel 200 restricted to an inboard side and the first and second return surfaces 230 , 240 the return channel 200 to an outside lying side.

Furthermore, a contour of the third return surface has 250 a substantially differentiable course from the first peripheral edge 122a to the second peripheral edge 122b of the jacket section 120 on (see for example 2 ). In addition, the second return surface 240 a substantially differentiable course from the first peripheral edge 112a to the second peripheral edge 112b of the inlet section 110 on (see for example 1B and 5 ). The contour is in this context as a contour of the second and third third return surface 240 , 250 in one plane of the tendon cross-section 264 consider. Differentiable means (inter alia) in this context that the contour of the third return surface 250 has no gaps, interruptions, kinks or sharp edges (but edges in the sense of a marking). The course of the contour of the second and third return surface 240 , 250 however, it can pass slightly through openings in the first and second holes 116 , 126 or the first and second annular groove 119 , 129 or by another technically necessary element for the fastening section 130 be interrupted. In the case of an interference fit ring 139 (please refer 4A and 4C ) or another fastening section 130 with windows 132 (please refer 5 and 6A to 6D ) can open the windows 132 however, be shaped to the effect that the differentiable contour of the inlet section 110 or jacket section 120 , ie the second return surface 240 or the third return surface 250 to restore.

As best in 1B can be seen, comprises the jacket portion 120 also a third peripheral edge 122c that is on the third return surface 250 is arranged. The third peripheral edge 122c is between the first peripheral edge 122a and the second peripheral edge 122b arranged. The third peripheral edge 122c defines a radially outermost area of the jacket section 120 . The third peripheral edge 122c of the jacket section 120 is from the second peripheral edge 312b of the compressor housing 310 arranged radially on the inside. The third peripheral edge 122c of the jacket section 120 is not a sharp edge, but can be seen as a kind of marking line. Beyond that is the third return surface 250 substantially elliptical between the first peripheral edge 122a and the third peripheral edge 122c shaped. The third return surface 250 is substantially circular between the third peripheral edge 122c and the second peripheral edge 122b shaped. The third peripheral edge 122c of the jacket section 120 defines one end of the diffuser area 204 (see for example 1B and 6B) .

In the third embodiment, the compressor housing comprises 310 also a third Peripheral edge 312c (please refer 6B) . The third peripheral edge 312c is on the first return surface 230 between the first peripheral edge 312a and the second peripheral edge 312b arranged. The third peripheral edge 312c defines a radially outermost region of the first return surface 230 . The third peripheral edge 122c of the jacket section 120 is from the third peripheral edge 312c of the compressor housing 310 arranged radially on the inside. The third peripheral edge 312c of the compressor housing 310 is not a sharp edge, but can be seen as a kind of marking line. The first return surface 230 is substantially elliptical between the first peripheral edge 312a and the third peripheral edge 312c shaped. The first return surface 230 is substantially circular between the third peripheral edge 312c and the second peripheral edge 312b shaped. The third peripheral edge 312c of the compressor housing 310 defines one end of the diffuser area 204 .

The jacket section 120 includes a compressor inlet surface 124 (see for example 1B , 1C and 6B) . The compressor inlet area 124 extends between the first peripheral edge 122a and the second peripheral edge 122b of the jacket section 120 next to the third return surface 250 . The compressor inlet area 124 is in an axial direction 22nd substantially flush with corresponding surfaces of the inlet section 110 and the compressor housing 310 axially upstream and axially downstream of the inlet surface 124 .

The return channel 200 further comprises a nozzle area 206 (see for example 1B , 2 and 5 ). The nozzle area 206 is along the chord line 202 behind the diffuser area 204 in a direction from the channel inlet 210 along the tendon line 202 to the duct outlet 220 educated. The second channel section 200b includes the nozzle area 206 . The nozzle area 206 starts at the third peripheral edge 122c of the jacket section 120 . A face of the annular cross section 262 of the return duct 200 takes in an orthogonal to the chordal line 202 running plane in the nozzle area 206 along the tendon line 202 in a direction from the channel inlet 210 to the duct outlet 220 from. The nozzle area becomes 206 characterized by an area which at least remains constant or decreases. That means that the area of the annular cross-section 262 at the end of the nozzle area 204 compared to the beginning of the nozzle area 206 is decreased.

As best in 5 can be seen includes the compressor 300 also a compressor wheel 320 . The compressor wheel 320 is rotatable in the compressor housing 310 arranged. The compressor wheel 320 further includes a leading edge 322 . The front edge 322 is axially upstream of the channel inlet 210 arranged. In other words, it is the channel inlet 210 axially downstream of the leading edge 322 arranged.

As best in 2 can be seen, the channel inlet points 210 an annular inlet slot 212 on, and the duct outlet 220 has an annular outlet slot 222 on. The annular inlet slot 212 has a first slot width 214 on. The annular outlet slot 222 has a second slot width 224 on. The first slot width 214 is determined by the smallest distance between the compressor housing 110 and the jacket section 120 in an orthogonal to the chord line 202 running direction defined while the second slot width 224 by the smallest distance between the inlet section 110 and the jacket section 120 in an orthogonal to the chord line 202 running direction is defined. The first slot width 214 is by an axial distance between the inlet section 110 and the jacket section 120 certainly. The annular inlet slot 214 extends essentially 360 ° along the circumference without interruptions. In other words, the annular inlet slot becomes 214 between the first and third return surfaces 230 , 250 Are defined. In addition is the annular inlet slot 212 from the radial direction 24 to an axial direction 22nd from the inlet section 110 to the jacket section 120 inclined at an angle α, where 20 ° α 50 °, preferably 25 ° α 45 ° and most preferably 30 ° α 40 °. In specific examples, the angle α can be 35 °. The second width of the slot 224 is determined by the axial distance between the inlet section 110 and the jacket section 120 Are defined. That means the second slot width 224 depending on the axial height of a part of the fastening section 130 that is directly axially between the inlet section 110 and the jacket section 120 remains, is set variably. The annular outlet slot 224 extends substantially 360 ° along the circumference without interruptions, with the exception of, if applicable, the attachment portion 130 or elements thereof. In other words, the annular outlet slot becomes 224 between the second and third return surfaces 240 , 250 Are defined. The annular outlet slot 222 is from the radial direction 24 to an axial direction 22nd from the inlet section 110 to the jacket section 120 inclined at an angle β, where 10 ° β 40 °, preferably 15 ° β 35 ° and most preferably 20 ° β 30 °. In specific examples, the angle α can be 25 °.

The invention also relates to a charging device 400 (please refer 7th ). The charger 400 includes a drive unit 410 , a wave 420 and the compressor 300 . The compressor 300 is about the wave 420 rotatable with the drive unit 410 coupled. In the example of 7th includes the drive unit 410 a turbine wheel. In other examples, the drive unit 410 additionally or alternatively comprise an electric motor. The compressor 300 includes the inlet section 100 , which is shown in a simplified manner.

List of reference symbols

22nd

Axial direction

24

Radial direction

26th

Circumferential direction

100

Inlet insert

110

Inlet section

111

inner thread

112a

First peripheral edge

112b

Second peripheral edge

114

Flange section

116

First drilling

116a

Recesses of the first holes

118

Annular heel

119

First ring groove

120

Jacket section

122a

First peripheral edge

122b

Second peripheral edge

122c

Third peripheral edge

124

Compressor inlet area

126

Second holes

126a

Recesses of the second holes

129

Second ring groove

130

Fastening section

131

thread

132

window

134

Bridges

134a

Cross section of the bars

136

Screws

137

Press fit pins

137a

Cross section of the press fit pins

138

Spacers

138a

Cross-section of the spacer

139

Interference fit ring

152

Sealing ring

200

Return channel

200a

First canal section

200b

Second canal section

202

Tendon line

202a

First chord line area

202b

Second chord line area

203

Chord length

203a

First range of chord length

203b

Second range of tendon length

204

Diffuser area

206

Nozzle area

210

Duct inlet

212

Annular inlet slot

214

First slot width

216

Inlet opening

220

Duct outlet

222

Annular outlet slot

224

Second slot width

226

Outlet opening

230

First return area

240

Second return area

250

Third return area

262

Annular cross-section

264

Tendon cross-section

300

compressor

310

Compressor housing

312a

First peripheral edge

312b

Second peripheral edge

312c

Third peripheral edge

314

Flange section

320

Compressor wheel

322

Front edge

400

Charger

410

Drive unit

420

wave

1. 1. Verdichter (300) für eine Aufladeeinrichtung (400), der Folgendes umfasst:
   • - ein Verdichtergehäuse (310),
   • - einen Einlasseinsatz (100) mit einem Einlassabschnitt (110) und einem Mantelabschnitt (120), und
   • - einen Rückführungskanal (200), der sich entlang einer Sehnenlinie (202) von einem Kanaleinlass (210), der axial zwischen dem Mantelabschnitt (120) und dem Verdichtergehäuse (310) angeordnet ist, zu einem Kanalauslass (220), der axial zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) angeordnet ist, erstreckt,
   • - wobei die Sehnenlinie (202) eine Sehnenlänge (203) aufweist,
   • - wobei der Rückführungskanal (200) einen ersten Kanalabschnitt (200a), der sich zwischen dem Mantelabschnitt (120) und dem Verdichtergehäuse (310) erstreckt, und einen zweiten Kanalabschnitt (200b), der sich zwischen dem Mantelabschnitt (120) und dem Einlassabschnitt (110) erstreckt, aufweist, und wobei
   • - es in dem ersten Kanalabschnitt (200a) keine Strömungshindernisse gibt.
2. 2. Verdichter (300) nach Ausführungsform 1, wobei der erste Kanalabschnitt (200a) 50 % bis 95 %, vorzugsweise 60 % bis 90 % und am stärksten bevorzugt 60 % bis 85 % der Sehnenlänge (203) entlang der Sehnenlinie (202) von dem Kanaleinlass (210) zu dem Kanalauslass (220) abdeckt.
3. 3. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei sich der Rückführungskanal (200) im Wesentlichen C-förmig zwischen dem Kanaleinlass (210) und dem Kanalauslass (220) erstreckt.
4. 4. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der Mantelabschnitt (120) in dem Bereich des Kanalauslasses (220) an dem Einlassabschnitt (110) befestigt ist,und optional wobei der Mantelabschnitt (120) in einer axialen Richtung (22) an dem Einlassabschnitt (110) befestigt ist.
5. 5. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der Einlasseinsatz (100) lediglich über den Einlassabschnitt (110) an dem Verdichtergehäuse (310) befestigt ist.
6. 6. Verdichter (300) nach Ausführungsform 5, wobei der Einlassabschnitt (110) einen Flanschabschnitt (114) umfasst, über den der Einlasseinsatz (100) an einem Flanschabschnitt (314) des Verdichtergehäuses (310) befestigt ist.
7. 7. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, der ferner einen Dichtungsring (152) umfasst, der zwischen dem Einlassabschnitt (110) und dem Verdichtergehäuse (310) angeordnet ist, und wobei optional der Dichtungsring (152) zwischen radial gerichteten Flächen des Einlassabschnitts (110) und des Verdichtergehäuses (310) angeordnet ist.
8. 8. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der Einlasseinsatz (100) ferner einen Befestigungsabschnitt (130) umfasst, der axial zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) angeordnet ist und den Einlassabschnitt (110) und den Mantelabschnitt (120) aneinander koppelt.
9. 9. Verdichter (300) nach Ausführungsform 8, wobei der Befestigungsabschnitt (130) von dem Kanalauslass (220) entlang der Sehnenlinie (202) von dem Kanalauslass (220) zu dem Kanaleinlass (210) um 1 % bis 15 %, vorzugsweise 2 % bis 10 % und am stärksten bevorzugt 3 % bis 5 % der Sehnenlänge (203), geringfügig beabstandet ist.
10. 10. Verdichter (300) nach einer der Ausführungsformen 8 oder 9, wobei der Befestigungsabschnitt (130) und der Mantelabschnitt (120) integral zusammen ausgebildet und über den Befestigungsabschnitt (130) an dem Einlassabschnitt (110) fixiert sind.
11. 11. Verdichter (300) nach einer der Ausführungsformen 8-10, wobei der Befestigungsabschnitt (130) als ein ringförmiger Vorsprung, der sich von dem Mantelabschnitt (120) in einer axialen Richtung (22) zu dem Einlassabschnitt (110) erstreckt, konfiguriert ist und mindestens zwei sich über den Umfang hinweg erstreckende Fenster (132), die den Kanalauslass (220) bilden, umfasst.
12. 12. Verdichter (300) nach einer der Ausführungsformen 10 oder 11, wobei der Befestigungsabschnitt (130) ein Außengewinde (131) umfasst und in ein Innengewinde (111) des Einlassabschnitts (110) geschraubt ist.
13. 13. Verdichter (300) nach einer der Ausführungsformen 8 oder 9, wobei der Einlassabschnitt (110), der Befestigungsabschnitt (130) und der Mantelabschnitt (120) integral zusammen ausgebildet sind.
14. 14. Verdichter (300) nach einer der Ausführungsformen 8, 9 oder 13, wobei der Befestigungsabschnitt (130) mindestens zwei Stege (134) umfasst, die sich zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) in einer axialen Richtung (22) erstrecken, so dass mindestens zwei sich über den Umfang hinweg erstreckende Fenster (132) zwischen den Stegen (134) in dem Bereich des Kanalauslasses (220) ausgebildet werden.
15. 15. Verdichter (300) nach Ausführungsform 14, wobei die Stege (134) zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) über den Umfang hinweg verteilt sind, und optional wobei die Stege (134) gleichmäßig beabstandet verteilt sind.
16. 16. Verdichter (300) nach einer der Ausführungsformen 14 oder 15, wobei ein Querschnitt (134a) der Stege (134) im Wesentlichen tropfenförmig konfiguriert ist.
17. 17. Verdichter (300) nach einer der Ausführungsformen 8 oder 9, wobei der Einlassabschnitt (110), der Befestigungsabschnitt (130) und der Mantelabschnitt (120) als separate Teile ausgebildet sind.
18. 18. Verdichter (300) nach einer der Ausführungsformen 8, 9 oder 17, wobei der Befestigungsabschnitt (130) mehrere über den Umfang hinweg verteilte Schrauben (136) umfasst, die den Mantelabschnitt (120) an dem Einlassabschnitt (110) befestigen.
19. 19. Verdichter (300) nach Ausführungsform 18, wobei der Einlassabschnitt (110) mehrere erste Bohrungen (116) umfasst und der Mantelabschnitt (120) mehrere zweite Bohrungen (126) umfasst, wobei die ersten und die zweiten Bohrungen (116, 126) dahingehend in einer Umfangsrichtung (26) entsprechend verteilt sind, gemeinsam eine jeweilige Schraube (136) aufzunehmen.
20. 20. Verdichter (300) nach Ausführungsform 19, wobei die ersten Bohrungen (116) als Sacklochbohrungen konfiguriert sind und die zweiten Bohrungen (126) als Durchgangsbohrungen konfiguriert sind.
21. 21. Verdichter (300) nach Ausführungsform 19, wobei die ersten Bohrungen (116) als Durchgangsbohrungen konfiguriert sind und die zweiten Bohrungen (126) als Sacklochbohrungen konfiguriert sind.
22. 22. Verdichter (300) nach einer der Ausführungsformen 19 oder 20, wobei die Schrauben (136) von und durch den Mantelabschnitt (120) in einer axialen Richtung (22) zu dem Einlassabschnitt (110) eingeführt werden.
23. 23. Verdichter (300) nach einer der Ausführungsformen 19 oder 21, wobei die Schrauben (136) von und durch den Einlassabschnitt (110) in einer axialen Richtung (22) zu dem Mantelabschnitt (120) eingeführt werden.
24. 24. Verdichter (300) nach einer der Ausführungsformen 17-23, wobei der Befestigungsabschnitt (130) mehrere über den Umfang hinweg verteilte Abstandshalter (138) umfasst, die axial zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) angeordnet sind.
25. 25. Verdichter (300) nach Ausführungsform 24, wobei ein Querschnitt (138a) der Abstandshalter (138) im Wesentlichen tropfenförmig konfiguriert ist.
26. 26. Verdichter (300) nach einer der Ausführungsformen 24 oder 25, wobei die Abstandshalter (138) hülsenförmig sind und wobei sich optional eine oder mehrere Schrauben (136) durch einen jeweiligen Abstandshalter (138) hindurch erstrecken.
27. 27. Verdichter (300) nach einer der Ausführungsformen 8, 9 oder 17, wobei der Befestigungsabschnitt (130) mehrere über den Umfang hinweg verteilte Presspassungsstifte (137) umfasst, die den Mantelabschnitt (120) an dem Einlassabschnitt (110) befestigen.
28. 28. Verdichter (300) nach Ausführungsform 27, wobei ein Querschnitt (137a) der Presspassungsstifte (137) im Wesentlichen tropfenförmig konfiguriert ist.
29. 29. Verdichter (300) nach einer der Ausführungsformen 27 oder 28, wobei der Einlassabschnitt (110) mehrere erste Bohrungen (116) umfasst und der Mantelabschnitt (120) mehrere zweite Bohrungen (126) umfasst, wobei die ersten und die zweiten Bohrungen (116, 126) dahingehend entsprechend in einer Umfangsrichtung (26) verteilt sind, gemeinsam einen jeweiligen Presspassungsstift (137) aufzunehmen.
30. 30. Verdichter (300) nach einer der Ausführungsformen 8, 9 oder 17, wobei der Befestigungsabschnitt (130) einen Presspassungsring (139) umfasst, der den Mantelabschnitt (120) an dem Einlassabschnitt (110) befestigt.
31. 31. Verdichter (300) nach Ausführungsform 30, wobei der Einlassabschnitt (110) eine erste Ringnut (119) umfasst und der Mantelabschnitt (120) eine zweite Ringnut (129) umfasst, wobei sich beide Nuten (119, 129) in der Umfangsrichtung (26) erstrecken und dahingehend koaxial angeordnet sind, gemeinsam den Presspassungsring (139) aufzunehmen.
32. 32. Verdichter (300) nach einer der Ausführungsformen 30 oder 31, wobei der Presspassungsring (139) mindestens zwei sich über den Umfang hinweg erstreckende Fenster (132) umfasst, die in dem Bereich des Kanalauslasses (220) angeordnet sind.
33. 33. Verdichter (300) nach Ausführungsform 32, wobei jeweilige Stege (134) des Presspassungsrings (139) über den Umfang hinweg zwischen den Fenstern (132) angeordnet sind und wobei optional ein Querschnitt (134a) der Stege (134) im Wesentlichen tropfenförmig konfiguriert ist.
34. 34. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der erste Kanalabschnitt (200a) einen Diffusorbereich (204) umfasst, der sich von dem Kanaleinlass (210) entlang der Sehnenlinie (202) zu dem Kanalauslass (220) erstreckt.
35. 35. Verdichter (300) nach Ausführungsform 34, wobei ein Fläche eines ringförmigen Querschnitts (262) des Rückführungskanals (200) in einer orthogonal zu der Sehnenlinie (202) liegenden Ebene in dem Diffusorbereich (204) entlang der Sehnenlinie (202) in einer Richtung von dem Kanaleinlass (210) zu dem Kanalauslass (220) zunimmt.
36. 36. Verdichter (300) nach einer der Ausführungsformen 34 oder 35, wobei der Diffusorbereich (204) 50 % bis 95 %, vorzugsweise 60 % bis 90 % und am stärksten bevorzugt 65 % bis 85 %, der Sehnenlänge (203) entlang der Sehnenlinie (202) von dem Kanaleinlass (210) zu dem Kanalauslass (220) abdeckt.
37. 37. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei das Verdichtergehäuse (310) eine erste Rückführungsfläche (230) des Rückführungskanals (200) zwischen einem ersten Umfangsrand (312a) und einem zweiten Umfangsrand (312b) des Verdichtergehäuses (310) definiert.
38. 38. Verdichter (300) nach Ausführungsform 37, wobei die erste Rückführungsfläche (230) einen radial am weitesten außen liegenden Abschnitt des Rückführungskanals (200) definiert.
39. 39. Verdichter (300) nach einer der Ausführungsformen 37 oder 38, wobei eine Kontur der ersten Rückführungsfläche (230) einen differenzierbaren Verlauf von dem ersten Umfangsrand (312a) zu dem zweiten Umfangsrand (312b) aufweist.
40. 40. Verdichter (300) nach einer der Ausführungsformen 37-39, wobei der zweite Umfangsrand (312b) des Verdichtergehäuses (310) weiter radial nach außen hin als ein radial am weitesten außen liegender Bereich des Mantelabschnitts (120) angeordnet ist.
41. 41. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der Einlassabschnitt (110) eine zweite Rückführungsfläche (240) des Rückführungskanals (200) zwischen einem ersten Umfangsrand (112a) und einem zweiten Umfangsrand (112b) des Einlassabschnitts (110) definiert und wobei der Mantelabschnitt (120) eine dritte Rückführungsfläche (250) des Rückführungskanals (200) zwischen einem ersten Umfangsrand (122a) und einem zweiten Umfangsrand (122b) des Mantelabschnitts (120) definiert.
42. 42. Verdichter (300) nach Ausführungsform 41, insofern abhängig von Ausführungsform 37, wobei der Rückführungskanal (200) zwischen der dritten Rückführungsfläche (250) auf einer Seite und der ersten und der zweiten Rückführungsfläche (230, 240) auf einer gegenüberliegenden Seite ausgebildet ist.
43. 43. Verdichter (300) nach einer der Ausführungsformen 41 oder 42, wobei eine Kontur der dritten Rückführungsfläche (250) einen im Wesentlichen differenzierbaren Verlauf von dem ersten Umfangsrand (122a) zu dem zweiten Umfangsrand (122b) des Mantelabschnitts (120) aufweist und wobei optional die zweite Rückführungsfläche (240) einen im Wesentlichen differenzierbaren Verlauf von dem ersten Umfangsrand (112a) zu dem zweiten Umfangsrand (112b) des Einlassabschnitts (110) aufweist.
44. 44. Verdichter (300) nach einer der Ausführungsformen 41-43, wobei der Mantelabschnitt (120) einen dritten Umfangsrand (122c) umfasst, der auf der dritten Rückführungsfläche (250) zwischen dem ersten Umfangsrand (112a) und dem zweiten Umfangsrand (112b) angeordnet ist und einen radial am weitesten außen liegenden Bereich des Mantelabschnitts (120) definiert.
45. 45. Verdichter (300) nach Ausführungsform 44, wobei die dritte Rückführungsfläche (250) im Wesentlichen elliptisch zwischen dem ersten Umfangsrand (122a) und dem dritten Umfangsrand (122c) geformt ist und wobei optional die dritte Rückführungsfläche (250) im Wesentlichen kreisförmig zwischen dem dritten Umfangsrand (122c) und dem zweiten Umfangsrand (122b) geformt ist.
46. 46. Verdichter (300) nach einer der Ausführungsformen 44 oder 45, insofern abhängig von Ausführungsform 34, wobei der dritte Umfangsrand (122c) des Mantelabschnitts (120) ein Ende des Diffusorbereichs (204) definiert.
47. 47. Verdichter (300) nach einer der Ausführungsformen 37-46, wobei das Verdichtergehäuse (310) einen dritten Umfangsrand (312c) umfasst, der auf der ersten Rückführungsfläche (230) zwischen dem ersten Umfangsrand (312a) und dem zweiten Umfangsrand (312b) angeordnet ist, und wobei optional der dritte Umfangsrand (312c) einen radial am weitesten außen liegenden Bereich der ersten Rückführungsfläche (230) definiert.
48. 48. Verdichter (300) nach Ausführungsform 47, wobei die erste Rückführungsfläche (230) im Wesentlichen elliptisch zwischen dem ersten Umfangsrand (312a) und dem dritten Umfangsrand (312c) geformt ist und wobei optional die erste Rückführungsfläche (230) im Wesentlichen kreisförmig zwischen dem dritten Umfangsrand (312c) und dem zweiten Umfangsrand (312b) geformt ist.
49. 49. Verdichter (300) nach einer der Ausführungsformen 47 oder 48, insofern abhängig von Ausführungsform 34, wobei der dritte Umfangsrand (312c) des Verdichtergehäuses (310) ein Ende des Diffusorbereichs (204) definiert.
50. 50. Verdichter (300) nach einer der Ausführungsformen 47-49, insofern abhängig von Ausführungsform 44, wobei der dritte Umfangsrand (312c) des Verdichtergehäuses (310) und der dritte Umfangsrand (122c) des Mantelabschnitts an im Wesentlichen gleichen axialen Positionen angeordnet sind.
51. 51. Verdichter (300) nach einer der Ausführungsformen 41-50, wobei der Mantelabschnitt (120) eine Verdichtereinlassfläche (124) umfasst, die sich zwischen dem ersten Umfangsrand (122a) und dem zweiten Umfangsrand (122b) des Mantelabschnitts (120) neben der dritten Rückführungsfläche (250) erstreckt.
52. 52. Verdichter (300) nach Ausführungsform 51, wobei die Verdichtereinlassfläche (124) in einer axialen Richtung (24) im Wesentlichen bündig mit entsprechenden Flächen des Einlassabschnitts (110) und des Verdichtergehäuses (310) axial stromaufwärts bzw. axial stromabwärts der Einlassfläche (124) ist.
53. 53. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, insofern abhängig von Ausführungsform 34, wobei der Rückführungskanal (200) einen Düsenbereich (206) umfasst und wobei optional der Düsenbereich (206) entlang der Sehnenlinie (202) hinter dem Diffusorbereich (204) in einer Richtung von dem Kanaleinlass (210) entlang der Sehnenlinie (202) zu dem Kanalauslass (220) ausgebildet ist.
54. 54. Verdichter (300) nach Ausführungsform 53, wobei eine Fläche des ringförmigen Querschnitts (262) des Rückführungskanals (200) in einer orthogonal zu der Sehnenlinie (202) verlaufenden Ebene in dem Düsenbereich (206) entlang der Sehnenlinie (202) in einer Richtung von dem Kanaleinlass (210) zu dem Kanalauslass (220) abnimmt.
55. 55. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der Kanalauslass (220) axial stromaufwärts des Kanaleinlasses (210) angeordnet ist.
56. 56. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, der ferner ein Verdichterrad (320) umfasst, das drehbar in dem Verdichtergehäuse (310) angeordnet ist und das einen vorderen Rand (322) umfasst, wobei der vordere Rand (322) axial stromaufwärts des Kanaleinlasses (210) angeordnet ist.
57. 57. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der Kanaleinlass (210) einen ringförmigen Einlassschlitz (212) mit einer ersten Schlitzbreite (214), die durch den kleinsten Abstand zwischen dem Verdichtergehäuse (110) und dem Mantelabschnitt (120) in einer orthogonal zu der Sehnenlinie (202) verlaufenden Richtung definiert wird, aufweist, wobei die erste Schlitzbreite (214) durch einen axialen Abstand zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) bestimmt wird.
58. 58. Verdichter (300) nach Ausführungsform 57, wobei der ringförmige Einlassschlitz (212) von der radialen Richtung (24) zu einer axialen Richtung von dem Einlassabschnitt (110) zu dem Mantelabschnitt (120) in einem Winkel (α) hingeneigt ist, wobei 20° ≤ α ≤ 50°, vorzugsweise 25° ≤ α ≤ 45° und stärkster bevorzugt 30° ≤ α ≤ 40°.
59. 59. Verdichter (300) nach einer der vorhergehenden Ausführungsformen, wobei der Kanalauslass (220) einen ringförmigen Auslassschlitz (222) mit einer zweiten Schlitzbreite (224), die durch den kleinsten Abstand zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) in einer orthogonal zu der Sehnenlinie (202) verlaufenden Richtung definiert wird, aufweist, wobei die zweite Schlitzbreite (224) durch einen axialen Abstand zwischen dem Einlassabschnitt (110) und dem Mantelabschnitt (120) bestimmt wird.
60. 60. Verdichter (300) nach Ausführungsform 59, wobei der ringförmige Auslassschlitz (222) von der radialen Richtung (24) zu einer axialen Richtung von dem Einlassabschnitt (110) zu dem Mantelabschnitt (120) in einem Winkel (β) hingeneigt ist, wobei 10° ≤ β ≤ 40°, vorzugsweise 15° ≤ β ≤ 35° und stärkster bevorzugt 20° ≤ β ≤ 30°.
61. 61. Aufladeeinrichtung (400), die Folgendes umfasst:
    • eine Antriebseinheit (410),
    • eine Welle (420),
    • einen Verdichter nach einer der vorhergehenden Ausführungsformen, wobei der Verdichter über die Welle (420) drehbar mit der Antriebseinheit (410) gekoppelt ist.
62. 62. Aufladeeinrichtung (400) nach Ausführungsform 61, wobei die Antriebseinheit (410) ein Turbinenrad und/oder einen Elektromotor umfasst.

It will be understood that the present invention can also (alternatively) be defined in accordance with the following embodiments:

1. 1st compressor ( 300 ) for a charger ( 400 ), which includes:
   • - a compressor housing ( 310 ),
   • - an inlet insert ( 100 ) with an inlet section ( 110 ) and a jacket section ( 120 ), and
   • - a return channel ( 200 ), which extends along a chord line ( 202 ) from a duct inlet ( 210 ) axially between the jacket section ( 120 ) and the compressor housing ( 310 ) is arranged to a duct outlet ( 220 ) axially between the inlet section ( 110 ) and the jacket section ( 120 ) is arranged, extends,
   • - where the chord line ( 202 ) a chord length ( 203 ) having,
   • - where the return channel ( 200 ) a first channel section ( 200a ), which is between the jacket section ( 120 ) and the compressor housing ( 310 ) and a second channel section ( 200b ), which is between the jacket section ( 120 ) and the inlet section ( 110 ) extends, has, and wherein
   • - it in the first duct section ( 200a ) there are no flow obstacles.
2. 2nd compressor ( 300 ) according to embodiment 1, wherein the first channel section ( 200a ) 50% to 95%, preferably 60% to 90% and most preferably 60% to 85% of the chord length ( 203 ) along the chord line ( 202 ) from the duct inlet ( 210 ) to the duct outlet ( 220 ) covers.
3. 3rd compressor ( 300 ) according to one of the preceding embodiments, wherein the return channel ( 200 ) essentially C-shaped between the duct inlet ( 210 ) and the duct outlet ( 220 ) extends.
4. 4th compressor ( 300 ) according to one of the preceding embodiments, wherein the jacket section ( 120 ) in the area of the duct outlet ( 220 ) at the inlet section ( 110 ) is attached, and optionally where the jacket section ( 120 ) in an axial direction ( 22nd ) at the inlet section ( 110 ) is attached.
5. 5th compressor ( 300 ) according to one of the preceding embodiments, wherein the inlet insert ( 100 ) only via the inlet section ( 110 ) on the compressor housing ( 310 ) is attached.
6. 6. Compressor ( 300 ) according to embodiment 5, wherein the inlet section ( 110 ) a flange section ( 114 ), through which the inlet insert ( 100 ) on a flange section ( 314 ) of the compressor housing ( 310 ) is attached.
7. 7. Compressor ( 300 ) according to one of the preceding embodiments, which also has a sealing ring ( 152 ) between the inlet section ( 110 ) and the compressor housing ( 310 ) is arranged, and optionally the sealing ring ( 152 ) between radially directed surfaces of the inlet section ( 110 ) and the compressor housing ( 310 ) is arranged.
8. 8. Compressor ( 300 ) according to one of the preceding embodiments, wherein the inlet insert ( 100 ) also a fastening section ( 130 ), axially between the inlet section ( 110 ) and the jacket section ( 120 ) is arranged and the inlet section ( 110 ) and the jacket section ( 120 ) couples to each other.
9. 9. Compressor ( 300 ) according to embodiment 8, wherein the fastening section ( 130 ) from the duct outlet ( 220 ) along the chord line ( 202 ) from the duct outlet ( 220 ) to the duct inlet ( 210 ) by 1% to 15%, preferably 2% to 10% and most preferably 3% to 5% of the chord length ( 203 ), is slightly spaced.
10. 10. Compressor ( 300 ) according to one of the embodiments 8 or 9, wherein the fastening section ( 130 ) and the jacket section ( 120 ) integrally formed together and via the fastening section ( 130 ) at the inlet section ( 110 ) are fixed.
11. 11. Compressor ( 300 ) according to one of the embodiments 8-10, wherein the fastening section ( 130 ) as an annular projection extending from the shell section ( 120 ) in an axial direction ( 22nd ) to the inlet section ( 110 ) is configured and has at least two circumferential windows ( 132 ), the duct outlet ( 220 ) includes.
12. 12. Compressor ( 300 ) according to one of the embodiments 10 or 11, wherein the fastening section ( 130 ) an external thread ( 131 ) and into an internal thread ( 111 ) of the inlet section ( 110 ) is screwed.
13. 13. Compressor ( 300 ) according to one of the embodiments 8 or 9, wherein the inlet section ( 110 ), the fastening section ( 130 ) and the jacket section ( 120 ) are integrally formed together.
14. 14. Compressor ( 300 ) according to one of the embodiments 8, 9 or 13, wherein the fastening section ( 130 ) at least two bars ( 134 ), which extends between the inlet section ( 110 ) and the jacket section ( 120 ) in an axial direction ( 22nd ) so that at least two circumferential windows ( 132 ) between Webs ( 134 ) in the area of the duct outlet ( 220 ) be formed.
15. 15. Compressor ( 300 ) according to embodiment 14, wherein the webs ( 134 ) between the inlet section ( 110 ) and the jacket section ( 120 ) are distributed over the circumference, and optionally where the webs ( 134 ) are evenly spaced apart.
16. 16. Compressor ( 300 ) according to one of the embodiments 14 or 15, wherein a cross section ( 134a ) the bars ( 134 ) is configured essentially teardrop-shaped.
17. 17. Compressor ( 300 ) according to one of the embodiments 8 or 9, wherein the inlet section ( 110 ), the fastening section ( 130 ) and the jacket section ( 120 ) are designed as separate parts.
18. 18. Compressor ( 300 ) according to one of the embodiments 8, 9 or 17, wherein the fastening section ( 130 ) several screws distributed over the circumference ( 136 ) which includes the jacket section ( 120 ) at the inlet section ( 110 ) fasten.
19. 19. Compressor ( 300 ) according to embodiment 18, wherein the inlet section ( 110 ) several first holes ( 116 ) and the jacket section ( 120 ) several second holes ( 126 ), wherein the first and the second bores ( 116 , 126 ) in a circumferential direction ( 26th ) are distributed accordingly, a respective screw ( 136 ).
20. 20. Compressor ( 300 ) according to embodiment 19, wherein the first bores ( 116 ) are configured as blind holes and the second holes ( 126 ) are configured as through holes.
21. 21. Compressor ( 300 ) according to embodiment 19, wherein the first bores ( 116 ) are configured as through holes and the second holes ( 126 ) are configured as blind holes.
22. 22. Compressor ( 300 ) according to one of the embodiments 19 or 20, wherein the screws ( 136 ) from and through the jacket section ( 120 ) in an axial direction ( 22nd ) to the inlet section ( 110 ) are introduced.
23. 23. Compressor ( 300 ) according to one of the embodiments 19 or 21, wherein the screws ( 136 ) from and through the inlet section ( 110 ) in an axial direction ( 22nd ) to the jacket section ( 120 ) are introduced.
24. 24. Compressor ( 300 ) according to one of the embodiments 17-23, wherein the fastening section ( 130 ) several spacers distributed over the circumference ( 138 ) which axially between the inlet section ( 110 ) and the jacket section ( 120 ) are arranged.
25. 25. Compressor ( 300 ) according to embodiment 24 , where a cross section ( 138a ) the spacer ( 138 ) is configured essentially teardrop-shaped.
26. 26. Compressor ( 300 ) according to one of the embodiments 24 or 25, where the spacers ( 138 ) are sleeve-shaped and with one or more screws ( 136 ) by a respective spacer ( 138 ) extend through.
27. 27. Compressor ( 300 ) according to one of the embodiments 8, 9 or 17, wherein the fastening section ( 130 ) several press-fit pins distributed over the circumference ( 137 ) which includes the jacket section ( 120 ) at the inlet section ( 110 ) fasten.
28. 28. Compressor ( 300 ) according to embodiment 27, wherein a cross section ( 137a ) the press fit pins ( 137 ) is configured essentially teardrop-shaped.
29. 29. Compressor ( 300 ) according to one of the embodiments 27 or 28, wherein the inlet section ( 110 ) several first holes ( 116 ) and the jacket section ( 120 ) several second holes ( 126 ), wherein the first and the second bores ( 116 , 126 ) accordingly in a circumferential direction ( 26th ) are distributed, together a respective press fit pin ( 137 ).
30. 30. Compressor ( 300 ) according to one of the embodiments 8, 9 or 17, wherein the fastening section ( 130 ) an interference fit ring ( 139 ) which includes the jacket section ( 120 ) at the inlet section ( 110 ) attached.
31. 31. Compressor ( 300 ) according to embodiment 30, wherein the inlet section ( 110 ) a first ring groove ( 119 ) and the jacket section ( 120 ) a second ring groove ( 129 ), with both grooves ( 119 , 129 ) in the circumferential direction ( 26th ) and are arranged coaxially to that effect, together the press fit ring ( 139 ).
32. 32nd compressor ( 300 ) according to one of the embodiments 30 or 31, wherein the press fit ring ( 139 ) at least two windows extending over the perimeter ( 132 ), which in the area of the duct outlet ( 220 ) are arranged.
33. 33. Compressor ( 300 ) according to embodiment 32, with respective webs ( 134 ) of the interference fit ring ( 139 ) across the perimeter between the windows ( 132 ) are arranged and where optionally a cross section ( 134a ) the bars ( 134 ) is configured essentially teardrop-shaped.
34. 34. Compressor ( 300 ) according to one of the preceding embodiments, wherein the first channel section ( 200a ) a diffuser area ( 204 ) that extends from the duct inlet ( 210 ) along the chord line ( 202 ) to the duct outlet ( 220 ) extends.
35. 35. Compressor ( 300 ) according to embodiment 34, wherein a surface of an annular cross section ( 262 ) of the return duct ( 200 ) in an orthogonal to the chord line ( 202 ) lying plane in the diffuser area ( 204 ) along the chord line ( 202 ) in one direction from the duct inlet ( 210 ) to the duct outlet ( 220 ) increases.
36. 36. Compressor ( 300 ) according to one of the embodiments 34 or 35, wherein the diffuser area ( 204 ) 50% to 95%, preferably 60% to 90% and most preferably 65% to 85%, of the chord length ( 203 ) along the chord line ( 202 ) from the duct inlet ( 210 ) to the duct outlet ( 220 ) covers.
37. 37. Compressor ( 300 ) according to one of the preceding embodiments, wherein the compressor housing ( 310 ) a first return surface ( 230 ) of the return duct ( 200 ) between a first peripheral edge ( 312a ) and a second peripheral edge ( 312b ) of the compressor housing ( 310 ) Are defined.
38. 38. Compressor ( 300 ) according to embodiment 37, wherein the first return surface ( 230 ) a radially outermost section of the return duct ( 200 ) Are defined.
39. 39. Compressor ( 300 ) according to one of the embodiments 37 or 38, wherein a contour of the first return surface ( 230 ) a differentiable course from the first peripheral edge ( 312a ) to the second peripheral edge ( 312b ) having.
40. 40th compressor ( 300 ) according to one of the embodiments 37-39, wherein the second peripheral edge ( 312b ) of the compressor housing ( 310 ) further radially outwards than a radially outermost area of the casing section ( 120 ) is arranged.
41. 41. Compressor ( 300 ) according to one of the preceding embodiments, wherein the inlet section ( 110 ) a second return surface ( 240 ) of the return duct ( 200 ) between a first peripheral edge ( 112a ) and a second peripheral edge ( 112b ) of the inlet section ( 110 ) and where the jacket section ( 120 ) a third return surface ( 250 ) of the return duct ( 200 ) between a first peripheral edge ( 122a ) and a second peripheral edge ( 122b ) of the jacket section ( 120 ) Are defined.
42. 42. Compressor ( 300 ) according to embodiment 41, insofar as it is dependent on embodiment 37, wherein the return channel ( 200 ) between the third return surface ( 250 ) on one side and the first and second return surfaces ( 230 , 240 ) is formed on an opposite side.
43. 43. Compressor ( 300 ) according to one of the embodiments 41 or 42, wherein a contour of the third return surface ( 250 ) an essentially differentiable course from the first peripheral edge ( 122a ) to the second peripheral edge ( 122b ) of the jacket section ( 120 ) and wherein optionally the second return surface ( 240 ) an essentially differentiable course from the first peripheral edge ( 112a ) to the second peripheral edge ( 112b ) of the inlet section ( 110 ) having.
44. 44. Compressor ( 300 ) according to one of the embodiments 41-43, wherein the jacket section ( 120 ) a third peripheral edge ( 122c ), which on the third return surface ( 250 ) between the first peripheral edge ( 112a ) and the second peripheral edge ( 112b ) is arranged and a radially outermost area of the jacket section ( 120 ) Are defined.
45. 45. Compressor ( 300 ) according to embodiment 44, wherein the third return surface ( 250 ) essentially elliptical between the first peripheral edge ( 122a ) and the third peripheral edge ( 122c ) and where optionally the third return surface ( 250 ) essentially circular between the third peripheral edge ( 122c ) and the second peripheral edge ( 122b ) is shaped.
46. 46. Compressor ( 300 ) according to one of the embodiments 44 or 45, insofar as it is dependent on embodiment 34, the third peripheral edge ( 122c ) of the jacket section ( 120 ) one end of the diffuser area ( 204 ) Are defined.
47. 47. Compressor ( 300 ) according to one of the embodiments 37-46, wherein the compressor housing ( 310 ) a third peripheral edge ( 312c ), which on the first return surface ( 230 ) between the first peripheral edge ( 312a ) and the second peripheral edge ( 312b ) is arranged, and optionally the third peripheral edge ( 312c ) a radially outermost area of the first return surface ( 230 ) Are defined.
48. 48. Compressor ( 300 ) according to embodiment 47, wherein the first return surface ( 230 ) essentially elliptical between the first peripheral edge ( 312a ) and the third Perimeter margin ( 312c ) and where optionally the first return surface ( 230 ) essentially circular between the third peripheral edge ( 312c ) and the second peripheral edge ( 312b ) is shaped.
49. 49. Compressor ( 300 ) according to one of the embodiments 47 or 48, insofar as dependent on embodiment 34, wherein the third peripheral edge ( 312c ) of the compressor housing ( 310 ) one end of the diffuser area ( 204 ) Are defined.
50. 50th compressor ( 300 ) according to one of the embodiments 47-49, insofar as it depends on embodiment 44, the third peripheral edge ( 312c ) of the compressor housing ( 310 ) and the third peripheral edge ( 122c ) of the jacket section are arranged at substantially the same axial positions.
51. 51. Compressor ( 300 ) according to one of the embodiments 41-50, wherein the jacket section ( 120 ) a compressor inlet area ( 124 ), which extends between the first peripheral edge ( 122a ) and the second peripheral edge ( 122b ) of the jacket section ( 120 ) next to the third return surface ( 250 ) extends.
52. 52. Compressor ( 300 ) according to embodiment 51, wherein the compressor inlet area ( 124 ) in an axial direction ( 24 ) essentially flush with corresponding surfaces of the inlet section ( 110 ) and the compressor housing ( 310 ) axially upstream or axially downstream of the inlet surface ( 124 ) is.
53. 53. Compressor ( 300 ) according to one of the preceding embodiments, insofar as dependent on embodiment 34, wherein the return channel ( 200 ) a nozzle area ( 206 ) and where optionally the nozzle area ( 206 ) along the chord line ( 202 ) behind the diffuser area ( 204 ) in one direction from the duct inlet ( 210 ) along the chord line ( 202 ) to the duct outlet ( 220 ) is trained.
54. 54. Compressor ( 300 ) according to embodiment 53, wherein a surface of the annular cross section ( 262 ) of the return duct ( 200 ) in an orthogonal to the chord line ( 202 ) running plane in the nozzle area ( 206 ) along the chord line ( 202 ) in one direction from the duct inlet ( 210 ) to the duct outlet ( 220 ) decreases.
55. 55. Compressor ( 300 ) according to one of the preceding embodiments, wherein the channel outlet ( 220 ) axially upstream of the duct inlet ( 210 ) is arranged.
56. 56. Compressor ( 300 ) according to one of the preceding embodiments, which also has a compressor wheel ( 320 ) which is rotatable in the compressor housing ( 310 ) is arranged and one front edge ( 322 ), with the leading edge ( 322 ) axially upstream of the duct inlet ( 210 ) is arranged.
57. 57. Compressor ( 300 ) according to one of the preceding embodiments, wherein the channel inlet ( 210 ) an annular inlet slot ( 212 ) with a first slot width ( 214 ), which is caused by the smallest distance between the compressor housing ( 110 ) and the jacket section ( 120 ) in an orthogonal to the chord line ( 202 ) extending direction, the first slot width ( 214 ) by an axial distance between the inlet section ( 110 ) and the jacket section ( 120 ) is determined.
58. 58. Compressor ( 300 ) according to embodiment 57, wherein the annular inlet slot ( 212 ) from the radial direction ( 24 ) to an axial direction from the inlet portion ( 110 ) to the jacket section ( 120 ) is inclined at an angle (α), where 20 ° α 50 °, preferably 25 ° α 45 ° and most preferably 30 ° α 40 °.
59. 59. Compressor ( 300 ) according to one of the preceding embodiments, wherein the channel outlet ( 220 ) an annular outlet slot ( 222 ) with a second slot width ( 224 ) determined by the smallest distance between the inlet section ( 110 ) and the jacket section ( 120 ) in an orthogonal to the chord line ( 202 ) running direction, the second slot width ( 224 ) by an axial distance between the inlet section ( 110 ) and the jacket section ( 120 ) is determined.
60. 60th compressor ( 300 ) according to embodiment 59, wherein the annular outlet slot ( 222 ) from the radial direction ( 24 ) to an axial direction from the inlet portion ( 110 ) to the jacket section ( 120 ) is inclined at an angle (β), where 10 ° β 40 °, preferably 15 ° β 35 ° and most preferably 20 ° β 30 °.
61. 61. Charger ( 400 ), which includes:
    • a drive unit ( 410 ),
    • a wave ( 420 ),
    • a compressor according to one of the preceding embodiments, wherein the compressor via the shaft ( 420 ) rotatable with the drive unit ( 410 ) is coupled.
62. 62. Charger ( 400 ) according to embodiment 61, wherein the drive unit ( 410 ) comprises a turbine wheel and / or an electric motor.

Claims (15)

A compressor (300) for a charging device (400), comprising: - a compressor housing (310), - An inlet insert (100) with an inlet section (110) and a jacket section (120), and - A return duct (200) which extends along a chord line (202) from a duct inlet (210), which is arranged axially between the shell section (120) and the compressor housing (310), to a duct outlet (220) which is axially between the Inlet section (110) and the jacket section (120) is arranged, extends, - wherein the chord line (202) has a chord length (203), - wherein the return duct (200) has a first duct section (200a) which extends between the jacket section (120) and the compressor housing (310), and a second duct section (200b) which extends between the jacket section (120) and the inlet section ( 110) extends, has, and wherein - There are no flow obstacles in the first channel section (200a). Compressor (300) after Claim 1 wherein the first channel section (200a) 50% to 95%, preferably 60% to 90% and most preferably 60% to 85%, of the chord length (203) along the chord line (202) from the channel inlet (210) to the channel outlet (220) covers. The compressor (300) according to any one of the preceding claims, wherein the return duct (200) extends in a substantially C-shape between the duct inlet (210) and the duct outlet (220). Compressor (300) according to one of the preceding claims, wherein the jacket section (120) is attached to the inlet section (110) in the region of the duct outlet (220) and optionally wherein the jacket section (120) is attached to the inlet section in an axial direction (22) (110) is attached. The compressor (300) according to any one of the preceding claims, wherein the inlet insert (100) is attached to the compressor housing (310) only via the inlet section (110). The compressor (300) according to any one of the preceding claims, wherein the inlet insert (100) further comprises a fastening section (130) which is arranged axially between the inlet section (110) and the jacket section (120) and the inlet section (110) and the jacket section ( 120) couples to one another, and optionally the fastening section (130) to the channel outlet (220) along the chord line (202) from the channel outlet (220) to the channel inlet (210) by 1% to 15%, preferably 2% to 10% and most preferably 3% to 5% of the chord length (203), is slightly spaced. Compressor (300) after Claim 6 wherein the fastening section (130) and the jacket section (120) are integrally formed together and are fixed to the inlet section (110) via the fastening section (130). Compressor (300) after Claim 6 wherein the inlet section (110), the fastening section (130) and the jacket section (120) are integrally formed together. Compressor (300) after Claim 6 , wherein the inlet section (110), the fastening section (130) and the jacket section (120) are designed as separate parts. Compressor (300) after one of the Claims 6 or 9 wherein the fastening section (130) comprises a plurality of screws (136) distributed over the circumference, which fasten the jacket section (120) to the inlet section (110). Compressor (300) after one of the Claims 6 or 9 wherein the fastening section (130) comprises a plurality of press-fit pins (137) distributed over the circumference, which fasten the jacket section (120) to the inlet section (110). The compressor (300) according to any one of the preceding claims, wherein the compressor housing (310) defines a first return surface (230) of the return duct (200) between a first peripheral edge (312a) and a second peripheral edge (312b) of the compressor housing (310) and optionally wherein a contour of the first return surface (230) has a differentiable course from the first peripheral edge (312a) to the second peripheral edge (312b). The compressor (300) according to any one of the preceding claims, wherein the first channel section (200a) comprises a diffuser region (204) extending from the channel inlet (210) along the chord line (202) to the channel outlet (220) and optionally wherein the return channel (200) comprises a nozzle area (206) and optionally wherein the nozzle area (204) along the chord line (202) behind the diffuser area (24) in a direction from the channel inlet (210) along the chord line (202) to the channel outlet (220) is trained. The compressor (300) according to any one of the preceding claims, wherein the duct outlet (220) is arranged axially upstream of the duct inlet (210). A charging device (400) comprising: a drive unit (410), a shaft (420), a compressor according to one of the preceding claims, wherein the compressor is rotatably coupled to the drive unit (410) via the shaft (420).

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