EP3734081A1 - Flow modification device for compressor - Google Patents

Abstract

The present invention relates to a flow modifying device for a compressor of a supercharging device. The flow modifying device comprises a cylindrical housing section which defines an inner jacket surface and comprises a downstream end area and an upstream end area in the axial direction. Furthermore, the flow modifying device comprises a plurality of pockets which are arranged spaced apart in the circumferential direction on the inner jacket surface. Each pocket is defined by a longitudinal projection line and a depth projection line. In an orientation plane that is formed by the longitudinal projection line and the depth projection line, a downstream entry angle α of the pocket relative to the inner surface of the jacket and an upstream entrance angle β of the pocket relative to the inner surface of the jacket are arranged. The downstream entry angle α defines a downstream opening area of the pocket and the upstream entry angle β defines an upstream opening area of the pocket. The pocket is designed such that: β <90 ° <α.

Description

Technical area

The present invention relates to a flow modifying device for a compressor of a supercharging device. The invention also relates to a compressor and a charging device with such a flow modifying device.

background

More and more vehicles of the newer generation are being equipped with charging devices in order to meet the requirements and legal requirements. When developing charging devices, it is important to optimize both the individual components and the system as a whole with regard to their reliability and efficiency.

Known charging devices usually have at least one compressor with a compressor wheel which is connected to a drive unit via a common shaft. The compressor compresses the fresh air drawn in for the internal combustion engine or for the fuel cell. This increases the amount of air or oxygen available to the engine for combustion and the fuel cell to react. This in turn leads to an increase in the performance of the internal combustion engine or the fuel cell. Charging devices can be equipped with different drive units. In the prior art, e-chargers, in which the compressor is driven by an electric motor, and exhaust gas turbochargers, in which the compressor is driven by an exhaust gas turbine, are known in particular. Combinations of both systems are also described in the prior art.

Each compressor has a compressor-specific compressor map, the operation of the compressor being limited to the area of the compressor map between the surge limit and the stuffing limit. In the compressor map, the volume flow achieved on the abscissa axis is compared with the pressure ratio between the compressor inlet and outlet on the ordinate axis. Furthermore, curves are plotted for different speeds up to the maximum permissible speed between the surge limit and the stuffing limit. Depending on the size and configuration of the compressor, operation at low volume flows through the compressor can be inefficient or no longer reliable because the surge limit is reached. This means that the surge limit limits the compressor map to the left, the stuffing limit to the right

Various measures are known in the prior art for optimizing the compressor map. In particular, these are adjustment mechanisms which are arranged in the inlet area of the compressor in the direction of flow in front of the compressor wheel and housing machining in the compressor inlet wall for flow modification. The flow cross-section in the compressor inlet can be varied by means of the adjusting mechanisms, whereby, for example, the flow velocity and the volume flow on the compressor wheel can be adjusted. The processing in the compressor inlet wall includes, in particular, so-called "ported shrouds" (e.g. recirculation channels). Both types of flow modifying devices act as a map-expanding or map-stabilizing measure, which in turn can reduce or avoid pumping of the compressor at engine-relevant operating points.

The object of the present invention is to provide an improved flow modifying device for stabilizing the characteristic map or a compressor with an improved compressor characteristic map.

Summary of the invention

The present invention relates to a flow modifying device for a compressor of a charging device according to claim 1. Furthermore, the invention relates to a compressor having a charging device with such a flow modifying device according to claim 10 or 15.

The flow modifier for a compressor of a supercharger comprises a cylindrical housing portion and a plurality of pockets. The cylindrical housing section defines an inner jacket surface. Furthermore, the cylindrical housing section comprises an end region which is downstream in the axial direction and an end region which is upstream in the axial direction. The upstream end area is arranged opposite the downstream end area in the axial direction. The pockets are arranged spaced apart in the circumferential direction on the inner lateral surface. There each pocket is defined by a longitudinal projection line and a depth projection line. In an orientation plane which is formed by the longitudinal projection line and the depth projection line, a downstream opening area of the pocket is defined by a downstream entry angle α of the pocket relative to the inner surface of the jacket. Also in the orientation plane, which is formed by the longitudinal projection line and the depth projection line, an upstream opening area of the pocket is defined by an upstream entry angle β of the pocket relative to the inner surface of the jacket. The pockets are designed in such a way that: β <90 ° <α. This special configuration of the pocket allows fluids to flow more easily into the pocket via the downstream opening region to the upstream opening region, in which the fluids can be guided again through the upstream entry angle β in the direction of the downstream end region. Such a configuration of the flow modifying device can, if it is used in a compressor, achieve a significant improvement in the stability of the characteristic field. In particular, both the lower and the upper map range can be stabilized. Compared to a "ported shroud" known from the prior art, the effectiveness of even lower pressure ratios can be seen. If the flow modifying device is used in a compressor for an internal combustion engine, the special design of the flow modifying device with the pockets enables a noticeable shift of the operating points near the surge limit towards lower throughputs (or higher pressure with the same throughput). As a result, an earlier and higher torque can be provided on the internal combustion engine. Furthermore, there are manufacturing advantages, for example in comparison to a "ported shroud", in which additional parts, for example a core for the recirculation cavity, are necessary, which, however, can be saved with the present flow modifying device.

In embodiments of the flow modifying device, the pocket can be designed in such a way that: β <180 ° - α. This configuration makes it possible to provide a steeper return flow from the pocket in the direction of the downstream end region. In alternative embodiments, the pocket can also be designed in such a way that β = 180 ° -α or β> 180 ° -α. The latter embodiment in particular can lead to simplifications in terms of manufacturing technology.

In configurations of the flow modifying device that can be combined with the previous configuration, the pocket can be designed such that 10 ° <β <30 °, preferably 15 ° <β <20 ° and particularly preferably 17 ° β 19 °.

In configurations of the flow modifying device that can be combined with any of the preceding configurations, the pocket can be designed such that 120 ° <α <165 °, preferably 130 ° <α <150 ° and particularly preferably 135 ° α 145 °.

In configurations of the flow modifying device which can be combined with any of the preceding configurations, the depth projection line can be inclined relative to the radial direction by an angle of incidence γ. In addition, the pocket can be designed such that 0 ° <γ <60 °, preferably 15 ° <γ <50 ° and particularly preferably 35 ° γ 45 °. In particular, the angle of incidence γ can be inclined in a direction of rotation of a compressor wheel from the radial direction. This advantageous embodiment leads to an improved flow of fluid into the pocket. This in turn allows a larger volume flow to be recirculated through the pocket back in the direction of the downstream end region. When using the flow modifying device in a compressor, a larger volume flow can thus be directed back to the compressor wheel, whereby the efficiency can be increased again.

In configurations of the flow modifying device that can be combined with any of the preceding configurations, a width of the pocket orthogonal to the orientation plane can be 1mm x F _D to 6mm x F _D , preferably 2mm x F _D to 5mm x F _D and particularly preferably 3mm x F _D to 4mm x F _D. Here, F _D = D / D _Ref , where D _{Ref is} preferably 60 mm and D corresponds to an outlet diameter of a compressor wheel of the compressor for which the flow modifying device is designed. In other words, this means that the dimensions of the pocket, in particular the width of the pocket, are configured as a function of the dimensions of the compressor wheel for the operation of which the flow modifying device is designed or with which it is used.

In configurations of the flow modifying device that can be combined with any of the preceding configurations, a length of the pocket along the longitudinal projection line can be 5mm x F _D to 30mm x F _D , preferably 10mm x F _D to 25mm x F _D and particularly preferably 15mm x F _D up to 20mm x F _D. Here, F _D = D / D _Ref , where D _{Ref is} preferably 60 mm and D corresponds to an outlet diameter of a compressor wheel of the compressor for which the flow modifying device is designed. In other words, this means that the dimensions of the pocket, in particular the length of the pocket, are configured as a function of the dimensions of the compressor wheel for whose operation the flow modifying device is designed or with which it is used together.

In configurations of the flow modifying device that can be combined with any of the preceding configurations, a depth of the pocket along the depth projection line can be 5mm x F _D to 30mm x F _D , preferably 10mm x F _D to 25mm x F _D and particularly preferably 15mm x F _D to 20mm x F _D. Here, F _D = D / D _Ref , where D _{Ref is} preferably 60 mm and D corresponds to an outlet diameter of a compressor wheel of the compressor for which the flow modifying device is designed. In other words, this means that the dimensions of the pocket, in particular the depth of the pocket, are configured depending on the dimensions of the compressor wheel for whose operation the flow modifying device is designed or with which it is used together.

In configurations of the flow modifying device which can be combined with any of the preceding configurations, the longitudinal projection line can be inclined relative to the axial direction by a tilt angle δ. In addition, the pocket can be designed such that 0 ° <δ <60 °, preferably 5 ° <δ <45 ° and particularly preferably 10 ° δ 30 °.

In configurations of the flow modifying device which can be combined with any of the preceding configurations, the pocket can comprise an opening with an opening area. In addition, the opening can comprise an opening length. The aperture length can extend along the longitudinal projection line and 2mm x 25mm x F _D to F _D, preferably 5mm x F _D F _D up to 20mm x 10mm, and more preferably x F _D to 15mm x F _D. The following applies to the factor F _D = D / D _Ref , where D _{Ref is} preferably 60 mm and D corresponds to an outlet diameter of a compressor wheel of the compressor for which the flow modifying device is designed. In other words, this means that the dimensions of the pocket, in particular the opening length of the pocket, are configured as a function of the dimensions of the compressor wheel for whose operation the flow modifying device is designed or with which it is used together. Alternatively or additionally, the longitudinal projection line can lie in a plane that is defined by the opening area.

In configurations of the flow modifying device which can be combined with any of the preceding configurations, the longitudinal projection line can run centrally through the pocket in the circumferential direction. Optionally, the longitudinal projection line can run centrally through the pocket in the circumferential direction, between the downstream opening area and the upstream opening area. Alternatively expressed, this means that the longitudinal projection line is a kind of center line in the longitudinal orientation of the pocket. The term "center" is to be understood here as a center seen in the circumferential direction. The course of the longitudinal projection line is along the longitudinal extent of the pocket. In other words, the longitudinal projection line runs from the downstream end area to the upstream end area. The longitudinal projection line also runs partly on the inner lateral surface.

In configurations of the flow modifying device which can be combined with any of the preceding configurations, the depth projection line can run centrally through the pocket in the circumferential direction. Expressed as an alternative, this means that the depth projection line is a kind of center line in the depth orientation of the pocket. The term "center" is to be understood here as a center seen in the circumferential direction.

In configurations of the flow modifying device which can be combined with any of the preceding configurations, the pocket can comprise a length, an opening with an opening length and a depth.

In configurations of the flow modifying device that can be combined with the previous configuration, a contour of the pocket can be defined by an entry point at which the downstream entry angle α is present, by an exit point at which the upstream entry angle β is present and by a changeover point between the entry point and the exit point will. In addition, the contour can lie in the orientation plane. This means that the contour is a kind of contour line of the pocket in a section in the orientation plane.

As an alternative or in addition to the preceding embodiment, the entry point can be determined by a downstream intersection between the longitudinal projection line and an opening contour of the opening. The exit point can be determined by an upstream point of intersection between the longitudinal projection line and the opening contour. The change point can represent the lowest point of the contour relative to the longitudinal projection line. That means the change point can be seen as the lowest point of the contour. That is, a point in the depth of the pocket at the intersection with the depth projection line.

As an alternative or in addition to the previous embodiment, a first contour section with a variable angle α 'can be formed between the entry point and the changeover point. A second contour section with a variable angle β 'can be formed between the changeover point and the exit point. The variable angles α 'and β' can be seen relative to the inner surface of the jacket. This means that the variable angles α 'and β' are to be seen analogously to the downstream entry angle α and to the upstream entry angle β. Alternatively, the variable angles α 'and β' can also be seen relative to a parallel line of the longitudinal projection line in the depth of the pocket according to the Z-angle analogy.

In addition to the previous embodiment, the variable angle α 'can change from α' = α at the entry point to α '= 180 ° at the change point in such a way that the course of the first contour section from the entry point to the change point has no jumps or kinks and the variable angle α 'does not at least become smaller. In other words, the course of the first contour section can be defined as differentiable, wherein alternatively or additionally, the variable angle α 'is at least not smaller in the course from the entry point to the change point.

As an alternative or in addition to the previous embodiment, the variable angle β 'can change from β' = 180 ° at the change point to β '= β at the exit point in such a way that the course of the second contour section from the change point to the exit point does not have any jumps or kinks and the variable angle β 'is at least not larger. In other words, the course of the second contour section can be defined as differentiable, alternatively or additionally, the variable angle β 'in the course from the change point to the exit point at least not increasing.

As an alternative or in addition to either of the two preceding configurations, the contour between the change point and the exit point can have a reversal point. In other words, the second contour section can have a reversal point. The reversal point can be arranged between the change point and the exit point. The reversal point can define a maximum length of the pocket. The reversal point can be defined in that the following applies to the variable angle β ': β' = 90 °. In other words, the reversal point can be defined in that the variable angle β 'in the course from the change point to the exit point reaches a value of β' = 90 ° for the first time.

In configurations of the flow modifying device that can be combined with the preceding configuration, the pockets can be arranged equidistantly in the circumferential direction. In alternative configurations, the pockets can also be arranged unevenly distributed in the circumferential direction. Furthermore, one or more of the pockets can also be designed differently from the other pockets. In particular, one or more of the dimensions of one or more pockets, that is to say a width and / or a length and / or a depth and / or an opening with an opening length different from one or more of the dimensions of the other pockets. The flow modifying device can also have different numbers of pockets.

The invention also relates to a compressor for a charging device. The compressor comprises a compressor housing, a compressor wheel and a flow modifying device according to any one of the preceding embodiments. The compressor housing defines a compressor inlet with an inlet cross-section and a compressor outlet. The compressor wheel is rotatably arranged in the compressor housing between the compressor inlet and the compressor outlet. As already mentioned above, the use of the flow modifying device in a compressor can achieve a significant improvement in the stability of the characteristic field. In particular, both the lower and the upper map range can be stabilized. Compared to a "ported shroud" known from the prior art, the effectiveness can be seen even at lower pressure ratios. If the compressor is used for an internal combustion engine, the special design of the flow modifying device with the pockets enables a noticeable shift of the operating points near the surge limit towards lower throughputs (or higher pressure with the same throughput). As a result, an earlier and higher torque can be provided on the internal combustion engine. The flow modifying device can be incorporated into existing parts as a retrofit measure by means of machining. This means that different customer applications can be covered with identical raw parts. This results in manufacturing and financial advantages through a high degree of equality of parts.

In embodiments of the compressor, the compressor can furthermore comprise an adjustment mechanism with a plurality of diaphragm elements for changing the inlet cross-section. Through the combined use of the flow modifying device with the adjustment mechanism, a further improvement in the stability of the characteristic field can be achieved, both in the lower and in the upper characteristic field range. In particular, the adjustment mechanism can be actuated between a first, open position and a second, closed position. In the first position, the inlet cross-section is unchanged. In the second position, however, the inlet cross-section is reduced. In particular in the case of low volume flow and / or low pressure ratios, the compressor characteristic map can be optimized by the adjustment mechanism by moving the adjustment mechanism into the second position. Thus, in the two different positions of the adjustment mechanism, there are two different map areas that are in a limit area are separated from each other by a gap. Through the combination with the special design of the flow modifying device, this gap between the map areas can be reduced. This surprising effect when the adjusting mechanism is used in combination with the flow modifying device makes it possible to provide a considerably improved compressor with an improved compressor map in both positions of the adjusting mechanism.

In configurations of the compressor which can be combined with the preceding configuration, the cylindrical housing section can be arranged downstream of the screen elements.

In configurations of the compressor which can be combined with either of the two preceding configurations, the cylindrical housing section can be configured as a bearing ring for the diaphragm elements. In this way, a separate prefabricated module can be provided for insertion into the compressor. Furthermore, the compressor or the combination of adjusting mechanism and flow modifying device can thereby be made more compact.

In configurations of the compressor which can be combined with any of the preceding configurations, the cylindrical housing section can be manufactured integrally with the compressor housing. Alternatively, the cylindrical housing section can be manufactured as a separate component. If the cylindrical housing section is manufactured as a separate component, the cylindrical housing section can be inserted into the compressor housing from the compressor inlet in the axial direction to the compressor outlet or from the compressor outlet in the axial direction to the compressor inlet, i.e. in the opposite direction. In particular, if the cylindrical housing section can be inserted into the compressor housing from the compressor outlet in the axial direction to the compressor inlet, a compressor contour can be formed by the cylindrical housing section. Because this compressor contour is formed on the separate cylindrical housing section, the geometry / surface of the compressor contour is more flexible and more easily accessible for precise machining. By integrally manufacturing the cylindrical housing section with the compressor housing, the flow modifying device can be integrated into existing compressor geometries. Is the cylindrical housing section is designed as a separate component, compressor housings of the same type can optionally be used for different compressor applications, into which differently configured flow modifying devices can be inserted. In addition, there may be manufacturing and / or material advantages if the cylindrical housing section is designed as a separate component. In sum, these configurations can result in manufacturing and financial advantages due to a high degree of equality of parts.

In configurations of the compressor which can be combined with any of the preceding configurations, the cylindrical housing section can be constructed in several parts. In particular, the cylindrical housing section can comprise several subdivision sections in the circumferential direction. Alternatively or additionally, the cylindrical housing section can comprise a plurality of subdivision sections in the axial direction.

In configurations of the compressor that can be combined with the preceding configuration, the cylindrical housing section can consist of a first subdivision section in the axial direction and a second subdivision section in the axial direction. The first and the second subdivision section are designed in particular ring-shaped. The first and second dividing sections can separate the pockets at their lowest point. In other words, this means that the first and the second dividing section divide the pockets at the change point. This has advantages in terms of manufacturing technology in particular. In addition, one of the first and second partition portions may be made integral with the compressor housing. Alternatively or additionally, the other of the first or the second subdivision section can be inserted into the compressor housing from the compressor inlet in the axial direction to the compressor outlet or from the compressor outlet in the axial direction to the compressor inlet. In particular, if the cylindrical housing section can be inserted into the compressor housing from the compressor outlet in the axial direction to the compressor inlet, a compressor contour can be formed by the cylindrical housing section. Because this compressor contour is formed on the separate cylindrical housing section, the geometry / surface of the compressor contour is more flexible and more easily accessible for precise machining.

In configurations of the compressor that can be combined with any of the preceding configurations, the cylindrical housing section, if it is designed as a separate part, can be connected to the compressor housing by a press fit, a snap-fit connection, a screw connection or another suitable coupling technology. This also applies analogously to configurations in which individual or all subdivision sections (if present) and not the entire housing section are manufactured separately.

In configurations of the compressor that can be combined with any of the preceding configurations, the cylindrical housing section, if it is designed as a separate part, can be made of plastic. Optionally, the cylindrical housing section can have an oversize in the direction of the compressor wheel, which can be reduced, in particular grinded, by the compressor wheel during operation of the compressor. In particular, a contour area of the compressor, ie the already mentioned compressor contour when the housing section is inserted from the compressor outlet in the axial direction to the compressor inlet, can be oversized and can be ground in by the compressor wheel. This advantageously results in a reduced necessary manufacturing tolerance. This in turn can reduce manufacturing costs and simplify the entire manufacturing process.

In configurations of the compressor which can be combined with any one of the preceding configurations, the compressor wheel can comprise a plurality of blades distributed in the circumferential direction. Each blade has a leading edge, a side edge, a trailing edge, a front side and a rear side. In addition, the pockets can be arranged in the axial direction in such a way that the opening of a respective pocket is located both upstream and downstream of a corner at which the leading edge and the side edge converge. In addition, the pockets can be arranged in the axial direction in such a way that a center of the opening, which lies at half the opening length, is located approximately at the corner. Other arrangements are also possible in alternative configurations. For example, a ratio between a downstream opening length that is arranged downstream of the corner to an upstream opening length that is arranged upstream of the corner can also be greater or less than 1. In configurations of the compressor that can be combined with any of the preceding configurations, the angle of incidence γ can be angled in a direction of rotation ω of the compressor wheel from the radial direction. This advantageous embodiment leads to an improved flow of fluid into the pocket. As a result, a larger volume flow can in turn be directed or recirculated through the pocket back in the direction of the downstream end area, that is to say back to the compressor wheel, which in turn can increase efficiency.

The invention also relates to a charging device. The charging device comprises a compressor and a compressor according to any one of the preceding embodiments. The charging device furthermore comprises a shaft via which the compressor and the drive unit are coupled to one another in a rotationally fixed manner. The drive device can comprise a turbine and / or an electric motor.

The invention further comprises a manufacturing method of a compressor according to any one of the preceding configurations. The pockets are produced in the housing section by a milling process, an erosion process, a casting process or a combination of several manufacturing processes. It is particularly preferred to provide a plurality of basic shapes for the respective pockets in the cylindrical housing section by a casting process and the subsequent milling out of the pockets.

Brief description of the figures

FIG. 1A

FIG. 14 shows a sectional view of the flow modifying device along section AA from FIG FIG. 1B ;

FIG. 1B

FIG. 14 shows a sectional view of the flow modifying device along section BB from FIG FIG. 1A ;

FIGS. 2A-2C

Figure 3 shows three different side views of a three-panel projection of the geometry of the pocket;

FIG. 3A

shows part of the FIG. 1A , from which the angle of attack γ can be found;

FIG. 3B

shows the arrangement of the tilt angle δ of a pocket relative to the axial direction;

FIG. 4th

shows a detailed view of the bag FIG. 2A to clarify the contour of the pocket;

FIG. 5

shows the compressor with the compressor wheel and the flow modifying device in a side sectional view along the section CC from FIG. 1A and a detail section Y of the pocket through a section along the orientation plane of the pocket;

FIG. 6th

shows the compressor with compressor wheel, the flow modifying device in a to FIG. 5 analog view and additionally comprising an adjustment mechanism and a detail section Z of the pocket;

FIGS. 7A-7B

show a comparison of compressor maps of a compressor only with an adjusting mechanism and a compressor with an adjusting mechanism and the flow modifying device for the open and closed positions of the adjusting mechanism;

FIG. 8A

show the cylindrical housing section of the flow modifying device in a greatly simplified form in an integral construction with the compressor housing;

FIGS. 8B-8C

show the cylindrical housing section of the flow modifying device in a greatly simplified form as a separate component inserted downstream in the axial direction and inserted upstream in the axial direction;

FIGS. 9A-9D

show various configurations of a cylindrical housing section of the flow modifying device constructed in several parts in the axial direction in a greatly simplified form in a compressor;

FIGS. 10A-10D

show schematic views of different fastening variants of the cylindrical housing section of the flow modifying device in a greatly simplified form as a separate component;

FIGS. 11A-11B

show one in one piece in the circumferential direction and one in the circumferential direction multi-part cylindrical housing section of the flow modifying device in a greatly simplified form in a compressor housing;

FIGS. 12A-12D

show different configurations and arrangements of the pockets in the cylindrical housing section;

FIGS. 13A-13E

show schematic representations of different manufacturing processes for the pockets in the cylindrical housing section;

FIG. 14th

shows a schematic representation of a charging device with a flow modifying device shown in a simplified manner and an adjusting mechanism shown in a simplified manner.

Detailed description

In the context of this application, the terms axial and axial direction relate to an axis of the flow modifying device, that is to say to a cylinder axis of the cylindrical housing section or to an axis of rotation of the compressor or of the compressor wheel. With reference to the figures (see e.g. FIGS. 1A - 1B or FIG. 5 ) the axial direction of the flow modifying device or compressor is shown with the reference number 22. A radial direction 24 relates to the axis 22 of the flow modifying device or of the compressor. Likewise, a circumference or a circumferential direction 26 relates to the axis 22 of the flow modifying device or of the compressor. Furthermore, the term downstream refers to a substantially axial direction 22 from one end region of the flow modifying device (more precisely: upstream end region) to another end region of the flow modifying device (more precisely: downstream end region). The term upstream refers to a direction substantially opposite to the downstream direction. With regard to the compressor, the terms downstream and upstream are to be regarded analogously, that is to say as essentially axial directions (22) which, starting from the compressor inlet, are directed towards or away from a compressor wheel of the compressor.

FIGS. 1A and 1B show the flow modifying device 10 according to the invention for a compressor 100 of a charging device 400. The flow modifying device 10 comprises a cylindrical housing section 150 and a plurality of pockets 200, which in the sectional view of FIG FIG. 1A is easy to see. The cylindrical housing section 150 defines an inner jacket surface 152 and an outer jacket surface 158. Furthermore, the cylindrical housing section 150 comprises an end region 154 downstream in the axial direction 22 and an end region 156 upstream in the axial direction 22. The upstream end region 156 is the downstream end region 154 in the axial direction 22 arranged opposite one another. The downstream end region 154 terminates in the axial direction 22 with a downstream end face 153. The upstream end region 156 terminates in the axial direction 22 with an upstream end face 155. The pockets 200 are arranged spaced apart in the circumferential direction 26 on the inner lateral surface 152. FIG. 1B shows how the pockets 200 along the section BB from FIG. 1A are arranged on the inner lateral surface 152. A respective opening 210 of a pocket 200 and the corresponding opening contour 210a can be seen. Shown in dashed lines and following the opening contour 210a of a respective pocket 200 is the course of the respective pocket 200, which is created because the respective pocket 200 has a special geometry and is oriented in a special orientation relative to the cylindrical housing section 150 or its inner lateral surface 152 is (see for example FIG. 1A ).

In order to define the geometry of a pocket 200 more precisely, a respective longitudinal projection line 202 and a respective depth projection line 204 can be introduced for a pocket 200 (see FIG FIGS. 2A-2C ). The pocket geometry is explained below using a pocket 200 as an example. However, this should be understood analogously for all pockets 200. In this regard, in FIG. 2A a section through the pocket 200 in an orientation plane 203 which is formed by the longitudinal projection line 202 and the depth projection line 204. To simplify understanding, it should be noted that the FIG. 2A while the section X from the FIG. 1A corresponds. That is, the section BB runs exactly along the orientation plane 203 of the pocket 200 from the section X. With reference to Figure 2A it can be seen that the pocket 200 has a downstream opening area 214 and an upstream opening area 216. The downstream opening area 214 is thereby through a downstream Entry angle α of pocket 200 is defined relative to inner surface 152. The upstream opening region 216 is defined by an upstream entry angle β of the pocket 200 relative to the lateral inner surface 152. "Relative to the inner jacket surface 152" is to be understood here relative to the solid material of the inner jacket surface 152. Both the downstream entry angle α and the upstream entry angle β lie in the orientation plane 203 (see FIG FIG. 2A ). The pocket 200 is designed in such a way that the following applies: β <90 ° <α.

This special configuration of the pocket 200 allows fluids, in particular backflowing fluids, to flow in a simplified manner into the pocket 200 via the downstream opening area 214 to the upstream opening area 216, in which the fluids can be guided again through the upstream entry angle β in the direction of the downstream end area 154 . This means that fluids flowing back can be effectively diverted in a downstream direction. Such a configuration of the flow modifying device 10 can, if it is used in a compressor 300, achieve a significant improvement in the stability of the characteristics map. In particular, both the lower and the upper map range can be stabilized. Compared to a "ported shroud" known from the prior art, the effectiveness of even lower pressure ratios can be seen. If the flow modifying device 10 is used in a compressor 300 for an internal combustion engine, the special design of the flow modifying device 10 with the pockets 200 enables a noticeable shift of the operating points near the surge limit towards smaller throughputs (or higher pressure with the same throughput). As a result, an earlier and higher torque can be provided on the internal combustion engine. Furthermore, there are manufacturing advantages, for example compared to a "ported shroud", in which additional parts, for example a core for the recirculation cavity, are necessary, which, however, can be saved in the present flow modifying device 10 through the special design with pockets 200.

As in FIG. 2 B As can be seen, the longitudinal projection line 202 runs centrally through the pocket 200 in the circumferential direction 26. In other words, this means that the longitudinal projection line 202 viewed centrally through the pocket 200 in the circumferential direction 26, between the downstream opening region 214 and the upstream opening region 216 runs or is oriented. This means that the longitudinal projection line 202 is to be understood as a kind of center line in the longitudinal orientation of the pocket 200. The term “center” is to be understood here as a center seen in the circumferential direction 26. In this regard, the FIGS. 1A, 1B , 2B and 2C a first side wall 232 and a second side wall 234 that each pocket 200 has. For reasons of clarity, the side walls 232, 234 are attached to the pockets 200 from the outside, although they are formed from the inside of the pockets 200 towards the cylindrical housing section 150. In particular the FIG. 2 B It can be clearly seen that the longitudinal projection line 202 extends centrally between the first side wall 232 and the second side wall 234. The course of the longitudinal projection line 202, on the other hand, is along the longitudinal extent of the pocket 200. Expressed alternatively, the longitudinal projection line 202 is from the downstream one End region 154 oriented towards the upstream end region 156. However, this only applies if the following applies to the tilt angle δ explained below: δ = 0 °. The longitudinal projection line 202 runs in a plane of the inner lateral surface 152. This is shown in particular in FIGS FIGS. 2A and 2B clearly, in which it can be seen that the longitudinal projection line 202 in the right part of the illustrated pocket 200 runs on a plane of the inner circumferential surface 152 or the opening 210 of the pocket 200. The opening 210 has an opening area 211. This opening area 211 is delimited by the opening contour 210a. The opening surface 211 lies in the same plane, in particular in a curved plane, as the inner lateral surface 152 (indicated in FIG FIG. 2 B ). This means that the opening area 211 lies on a lateral plane of the inner lateral surface. That is to say, the opening area 211 has a curvature or bulge. For the longitudinal projection line 202 this means that it lies in the right part of the illustrated pocket 200 on the opening surface 211. Expressed as an alternative, the longitudinal projection line 202 lies in a plane which is defined by the opening area 211. In the left part of the illustrated pocket 200, the longitudinal projection line 202 also runs at least partially directly on the lateral inner surface 152. The depth projection line 204, which also runs centrally through the pocket 200 in the circumferential direction 26, can be seen analogously. This means that the depth projection line 204 is a kind of center line in the depth orientation of the pocket 200. A depth orientation can be understood here as an orientation of the pocket 200 which, starting from the opening 210, is centered between the side walls 232, 234, starting from the inner lateral surface 152, into the Material of the cylindrical housing section 150 extends to the lowest point of the pocket 200 (see FIGS. 2A and 2C ). The term “center” is to be understood here as a center seen in the circumferential direction 26. In principle, the longitudinal projection line 202 and the depth projection line 204 are to be understood as relative orientation lines of the pocket 200, which each run centrally between the side walls 232, 234 of the pocket 200. For this reason, the longitudinal projection line 202 and the depth projection line 204 are shown as dash-dot-lined straight lines in the respective views of the figures. In this regard, please also refer to the FIG. 1A and the FIG.1B referenced, in which by way of example for a pocket 200, the depth projection line 204 or the longitudinal projection line 202 are shown (see pocket 200 on the far right in section BB).

How on that FIG. 2A As can be seen, the pocket 200 is designed such that the following applies: β <180 ° - α. This configuration makes it possible to provide a steeper return flow from the pocket 200 in the direction of the downstream end region 154. In alternative embodiments, however, the pocket 200 can also be designed such that β = 180 ° −α or β> 180 ° −α applies. In particular, the latter configuration can lead to simplifications in terms of manufacturing technology, since the undercut at the upstream entry angle β, that is to say at the upstream opening region 216, may be easier to manufacture. In the example of FIG. 2A the pocket 200 is formed with an upstream entry angle β of approximately 17 ° β 19 °, and with a downstream entry angle α of approximately 135 ° α 145 °. That is, the upstream entry angle β or the downstream entry angle α is an exact value from the respective interval. In principle, however, other values can also be selected for the entry angles α and β in alternative designs. For example, the upstream entry angle β can also assume a value in the range of 10 ° <β <30 °, preferably in the range of 15 ° <β <20 °. The downstream entry angle α can also assume a value in the range of 120 ° <α <165 °, preferably in the range of 130 ° <α <150 °.

As in FIG. 1A can be seen and in FIG. 3A is shown in detail, depth projection line 204 is inclined relative to the radial direction 24 by an angle of incidence γ. A value of 35 ° <γ <45 ° particularly preferably applies to this angle of incidence γ. Alternatively, the pocket can also be designed so that 0 ° <γ <60 ° and preferably 15 ° <γ <50 ° applies to the angle of incidence γ. Is the flow modifier 10 in a compressor 300, the angle of incidence γ can be inclined in particular in a direction of rotation ω of a compressor wheel 320 from the radial direction 24. A direction of rotation ω in the is exemplary FIGS. 1A and 3A shown. This advantageous embodiment leads to an improved flow of fluid into the pocket 200. This in turn allows a larger volume flow to be recirculated through the pocket 200 back in the direction of the downstream end region 154. When using the flow modifying device 10 in a compressor 300, a larger volume flow can thus be directed back to the compressor wheel 320, whereby the efficiency can be increased again.

Only in the FIG. 3B a further design option of the flow modifying device 10 is indicated schematically, which can be implemented in addition or as an alternative to one, more or all of the design options. An exemplary pocket 200 is shown here relative to the axial direction 22. It can be seen here that the longitudinal projection line 202 can be inclined relative to the axial direction 22 by a tilt angle δ. This tilt angle δ can assume a value from 0 ° <δ <60 °, preferably 5 ° <δ <45 ° and particularly preferably 10 ° 30 °. In particular, it is advantageous here if the longitudinal projection line 202 is inclined from the axial direction 22 by the tilt angle δ in such a way that the upstream opening area 216 is inclined from the axial direction 22 counter to a direction of rotation ω of a compressor wheel 320. This has the particular advantage that the fluids flowing out of the pocket 200 experience a movement component in the circumferential direction 26. In this way, a flow onto a compressor wheel 320 can be improved.

Based on FIGS. 2A-2C further dimensions of the pocket 200 are explained. These include, for example, a width 207 of the pocket 200, a length 208 of the pocket 200, a depth 209 of the pocket 200 and an opening length 212 of the already mentioned opening 210 of the pocket 200. These dimensions are given in a factorized manner to allow for a corresponding variance for different compressor applications to cover different sizes. The factor F _{D is} used, which is defined as follows: F _D = D / D _Ref . D _Ref corresponds to a reference outlet diameter of a compressor wheel 320 and is preferably 60 mm. D corresponds to an outlet diameter of a compressor wheel 320 of the compressor 300 of the present application. That is, D corresponds to an outlet diameter of a compressor wheel 320 of the compressor 300 for which the Flow modifying device 10 is designed. In other words, this means that the dimensions of the pocket 200, in particular the width 207, the length 208, the depth 209 and the opening length 212 depending on the dimensions of the compressor wheel 320 for its operation, the flow modifying device 10 is designed or with the used together, configured. 207 Concretely, the width of the pocket 200 a value between 1 mm x F _D and 6mm x F _D, preferably a value between 2 mm x F _D and 5mm x F _D, and more preferably a value between 3mm x F _D and 4mm x F _D at. The width 207 can be seen orthogonally to the orientation plane 203. That is, the width 207 is to be seen as the distance between the side walls 232, 234 (see FIG FIG. 2B and 2C ). Specifically, the length 208 of the pocket 200 takes a value between 5mm x F _D and 30mm x F _D , preferably a value between 10mm x F _D and 25mm x F _D and particularly preferably a value between 15mm x F _D and 20mm x F _D at. The length 208 runs along the longitudinal projection line 202. That is, the length 208 runs in the orientation plane 203. In other words, the length 208 corresponds to a maximum extent of the pocket 200 in the orientation plane 203 along the longitudinal projection line 202 (see FIG FIG. 2A and 2B ). 209 concrete increases the depth of the pocket 200 a value between 5mm x F _D and 30mm x F _D, preferably a value between 10mm x F _D and 25mm x F _D, and more preferably a value between 15mm x F _D and 20mm x F _D at. The depth 209 runs along the depth projection line 204. That is, the depth 209 runs in the orientation plane 203. In other words, the depth 209 corresponds to a maximum extent of the pocket 200 starting from the inner lateral surface 152 or from the opening surface 211 along the Depth projection lines 204 in the material of the cylindrical housing section 150 down to the deepest point of the pocket 200 (see FIG. 2A and 2C ). Specifically, the opening length 212 of the pocket 200 takes a value between 2mm x F _D and 25mm x F _D , preferably a value between 5mm x F _D and 20mm x F _D and particularly preferably a value between 10mm x F _D and 15mm x F _D at. The opening length 212 runs along the longitudinal projection line 202. That is, the opening length 212 runs in the orientation plane 203. The opening length 212 in the downstream opening area 214 and in the upstream opening area 216 are each limited by the opening contour 210a (see FIG FIG. 2A and 2B ).

In the following, further properties of the pocket 200 will be explained with reference to FIG FIG. 4th explained. It can be seen here that the pocket 200 can be defined more precisely by a contour 220 which lies in the orientation plane 203. That is, the contour 220 is a type of contour line of the pocket 200 in a section in the orientation plane 203. The contour 220 has an entry point 222 at which the downstream entry angle α is present, an exit point 228 at which the upstream entry angle β is present and a change point 224, which lies between the entry point 222 and the exit point 228. The entry point 222 is determined by a downstream intersection between the longitudinal projection line 202 and the opening contour 210a (see FIG FIG. 2 B ). The exit point 228 is determined by an upstream point of intersection between the longitudinal projection line 202 and the opening contour 210a (see FIG FIG. 2 B ). The change point 224 represents the lowest point of the contour 220 relative to the longitudinal projection line 202. That is, the change point 224 can be viewed as the lowest point of the contour 220. In other words, the change point 224 can be an intersection of the depth projection line 204 with the pocket 200 at the depth 209. A first contour section 220a with a variable angle α 'is formed between the entry point 222 and the change point 224. A second contour section 220b with a variable angle β 'is formed between the changeover point 224 and the exit point 228. The variable angles α 'and β' can be seen relative to the inner surface 152. This means that the variable angles α 'and β' are to be seen analogously to the downstream entry angle α and to the upstream entry angle β. More precisely, the variable angles α 'and β' can also be seen according to the Z-angle analogy relative to a parallel P of the longitudinal projection line 202 in the depth 209 of the pocket 200 (see FIG FIG. 4th ). The first contour section 220a extends within a downstream longitudinal section 208a of the length 208 of the pocket 200. The second contour section 220b extends within an upstream longitudinal section 208b of the length 208 of the pocket 200.

The contour 220 has a course such that the variable angle α 'changes from α' = α at the entry point 222 to α '= 180 ° at the changeover point 224. The variable angle α 'changes from the entry point 222 to the changeover point 224 in such a way that the course of the first contour section 220a from the entry point 222 to the changeover point 224 has no jumps or kinks and the variable angle α' is at least not smaller. In other words, the course of the first contour section 220a can be defined as differentiable, the variable angle α 'at least not becoming smaller in the course from the entry point 222 to the changeover point 224. The contour 220 has a course such that the variable angle β 'changes from β' = 180 ° at the change point 224 to β '= β at the exit point 228 such that the course of the second contour section 220b from the change point 224 to the exit point 228 has no cracks or kinks and the variable angle β 'is at least not larger. In other words, the course of the second contour section 220b can be defined as differentiable, alternatively or additionally, the variable angle β 'in the course from the change point 224 to the exit point 228 at least not increasing. These particularly advantageous configurations lead to improved and more uniform flow conditions within a pocket 200.

Furthermore, the FIG. 4th it can be seen that the contour 220 has a reversal point 226 between the changeover point 224 and the exit point 228. More precisely, the reversal point 226 is arranged in the second contour section 220b. The reversal point 226 is arranged between the changeover point 224 and the exit point 228. The reversal point 226 limits the maximum length 208 of the pocket 200, in particular the maximum length 208 of the pocket 200 in the upstream direction. The reversal point 226 is defined in that the following applies to the variable angle β ': β' = 90 °. In other words, the reversal point can be defined in that the variable angle β 'in the course from the change point 224 to the exit point 228 reaches a value of β' = 90 ° for the first time.

The FIGS. 12A-12D show various flow modifying devices 10 with different configurations and arrangements of the pockets 200 in the cylindrical housing section 150. Compared to FIG FIG. 1A , in which the flow modifying device 10 comprises 19 pockets 200, the flow modifying devices 10 of FIG FIGS. 12A and 12B only 10 or 5 pockets 200 each. For example, depending on the operating requirements of the flow modifying device 10 in use in a compressor 300 and / or different configurations of the pockets 200 (e.g. different configurations of the width 207, the length 208, the depth 209, the angles α, α ', β, β' and / or the opening length 212 of a pocket 200), the flow modifying device 10 have different numbers of pockets 200, also more than 19, less than 5 or other numbers between 5 and 19. Here, the FIG. 12D an example of a flow modifying device 10 in which differently configured pockets 200 are present. Although in the FIG. 12D Only two different types of configurations of pockets 200 are shown, several of the pockets can also be configured differently from other pockets 200 (for example 3, 4, 5, etc. different types of configurations of pockets 200). In particular, one or more of the dimensions of one or more pockets 200, i.e. a width 207 and / or a length 208 and / or a depth 209 and / or an opening 210 with an opening length 212 and / or one or more of the angles α, α ', β, β' can be designed differently from one or more of the dimensions of the other pockets 200. In the examples of the FIGS. 1A , 12A, 12B and 12D the pockets 200 are arranged equidistantly in the circumferential direction 26. In alternative configurations, the pockets 200 can also be arranged unevenly distributed in the circumferential direction 26 (see FIG FIG. 12C ). In particular, combinations of different arrangements with different designs of pockets 200 are also possible.

The invention further relates to a compressor 300 for a charging device 400, which is shown schematically in a side sectional view in FIG FIG. 5 and the corresponding detail section Y is shown. The detail section Y is in area Y of the FIG. 5 to be located, but runs in the area of the pocket 200 through a section along the orientation plane 203 of the pocket 200. That is, the FIG. 5 and the corresponding detail section Y are basically in section CC of FIG. 1 shown, but the upper pocket 200, which is explained in detail in detail Y, is shown in a section along the orientation plane 203 of the pocket 200 in order to be able to describe the opening length 212 accordingly. In comparison, the FIG. 6th and the associated detail section Z completely in section CC of FIG. 1 shown. The compressor 300 comprises a compressor housing 310, a compressor wheel 320 and the flow modifying device 10. The compressor housing 310 defines a compressor inlet 312 with an inlet cross section 312a and a compressor outlet 314. The compressor wheel 320 is rotatably arranged in the compressor housing 310 between the compressor inlet 312 and the compressor outlet 314 . As already mentioned above, the use of the flow modifying device 10 in a compressor 300 can result in a significant improvement the map stability can be achieved. In particular, both the lower and the upper map range can be stabilized. Compared to a "ported shroud" known from the prior art, the effectiveness can be seen even at lower pressure ratios. If the compressor 300 is used for an internal combustion engine, the special design of the flow modifying device 10 with the pockets 200 enables a noticeable shift of the operating points near the surge limit towards lower throughputs (or higher pressure with the same throughput). As a result, an earlier and higher torque can be provided on the internal combustion engine. The flow modifying device 10 can be incorporated as a retrofit measure into existing parts by means of machining. This means that different customer applications can be covered with identical raw parts. This results in manufacturing and financial advantages through a high degree of equality of parts.

In the example of FIG. 5 For example, the cylindrical housing section 150 of the flow modifying device 10 is manufactured integrally with the compressor housing 310. Alternatively, the cylindrical housing section 150 can also be manufactured as a separate component. In this regard, they show FIGS. 8A-8C Simplified compressor housing 310 with a flow modifying device 10 shown in a greatly simplified manner and without a turbine wheel 320. Here, FIG FIG. 8A a cylindrical housing section 150 manufactured integrally with the compressor housing 310, a cylindrical housing section 150, which is manufactured as a separate component from the FIGS. 8B and 8C juxtaposed. The flow modifying device 10 or the cylindrical housing section 150 can be configured from the compressor inlet 312 in the axial direction 22 to the compressor outlet 314 (see FIG FIG. 8B ) or from the compressor outlet 314 in the axial direction to the compressor inlet 312, that is to say in the opposite direction, to be insertable into the compressor housing 310 (see FIG FIG. 8C ). In particular, if the cylindrical housing section 150 can be inserted into the compressor housing 310 from the compressor outlet 314 in the axial direction 22 to the compressor inlet 312, a compressor contour 316 can be formed by the cylindrical housing section 150. Because this compressor contour 316 is formed on the separate cylindrical housing section 150, the geometry / surface of the compressor contour 316 is more flexible and more easily accessible for precise machining. By an integral manufacture of the cylindrical housing section 150 with the compressor housing 310, the Flow modifying device 10 can be integrated into existing compressor geometries. If the cylindrical housing section 150 is designed as a separate component, compressor housings 310 of the same type can optionally be used for different compressor applications, into which differently configured flow modifying devices 10 can be inserted. Furthermore, there may be manufacturing and / or material advantages if the cylindrical housing section 150 is designed as a separate component. In sum, these configurations can result in manufacturing and financial advantages due to a high degree of equality of parts.

FIG. 6th and the associated detail section Z show a further embodiment of the compressor 300, in which the compressor 300 comprises an adjusting mechanism 100 with a plurality of diaphragm elements 110 for changing the inlet cross section 312a. All of the previously explained possible variations of the compressor 300 and / or the flow modifying device 10 also apply to this embodiment of the compressor 300. The flow modifying device 10 is arranged downstream of the adjustment mechanism 100 or downstream of the screen elements 110. More precisely, the cylindrical housing section 150 is arranged downstream of the adjustment mechanism 100 or downstream of the screen elements 110. Regardless of whether the cylindrical housing section 150 is manufactured integrally with the bearing housing 310 or as a separate component, the cylindrical housing section 150 can be configured as a bearing ring 130 for the diaphragm elements 110 (see FIG FIG. 6th ). In this way, a separate prefabricated module can be provided for insertion into the compressor 300. Furthermore, the compressor 300 or the combination of adjusting mechanism 100 and flow modifying device 10 can be made more compact as a result. For the sake of completeness, it should be mentioned that the adjusting mechanism 100 comprises an adjusting ring 120 for adjusting the panel elements 110 (see detail section Z of FIG FIG. 6th ).

Through the combined use of the flow modifying device 10 with the adjusting mechanism 100, a further improvement in the map stability can be achieved, both in the lower and in the upper map area. The adjustment mechanism 100 can be actuated between a first, open position and a second, closed position. In the first position, the inlet cross section 312a is unchanged. In the second position, however, the inlet cross section 312a is reduced (see FIG FIG. 6th ). In particular in the case of low volume flows and / or low pressure ratios, the compressor map can be optimized by the adjustment mechanism 100 by moving the adjustment mechanism 100 into the second position. Thus, in the two different positions of the adjusting mechanism 100, there are two different map areas K ₁ (closed) and K ₂ (open), which are separated from one another in a border area by a gap area L. This connection is in the FIG. 7A which shows a compressor map in which the pressure ratio p ₁ / p ₂ is plotted over the volume flow V̇ for a compressor which comprises only one adjusting mechanism 100 and no flow modifying device 10. In the compressor map of the FIG. 7A the two map areas K ₁ (closed) and K ₂ (open) and the gap area L are plotted. By means of the adjustment mechanism 100, a significant expansion of the map area K ₁ to the map area K2 towards low volume flows V̇ and low pressure ratios p ₁ / p _{2 can be} achieved. However, for operating points in the gap region L, pumping or plugging (depending on the position in which the adjusting mechanism 100 is) of the compressor can occur. In contrast, the FIG. 7B the compressor map of a compressor 300 according to the invention comprises both the adjusting mechanism 100 and the flow modifying device 10. It can be seen that, in particular, the map area K ₁ (open position) can be expanded significantly in the direction of lower volume flows V and lower pressure ratios p ₁ / p ₂ by the map area K _Δ (shown in dashed lines) in relation to the map area K ₁ of FIG. 7A . This can be achieved by combining the adjustment mechanism 100 with the special design of the flow modifying device 10, whereby the gap area L is made FIG. 7A can be reduced significantly. As a result of this surprising effect with a combined use of the adjusting mechanism 100 with the flow modifying device 10, a considerably improved compressor 300 can be provided with a compressor map or map areas improved in both positions of the adjusting mechanism 100.

The FIGS. 9A-9D and 11B show exemplary configurations in which the cylindrical housing section 150 is constructed in several parts. As in FIG. 11B As shown, the cylindrical housing section 150 may comprise a plurality of subdivision sections 157 in the circumferential direction 26. These subdivision sections 157 in the circumferential direction 26 may also be referred to as circumferential partition sections 157. For example, a separate, circumferential dividing section 157 can be provided for each pocket 200 (see FIG FIG. 11B ). Alternatively, a circumferential dividing section 157 can also accommodate a plurality of pockets 200. Even if the FIG. 11B 8th circumferential subdivision sections 157 are shown, the cylindrical housing section 150 can also comprise more or less circumferential subdivision sections 157. For example, a circumferential dividing section 157 can be designed to be essentially T-shaped in cross-section in order to be secured against slipping out in the radial direction 24 (see also FIG FIG. 11B ). In contrast, the cylindrical housing section 150 can also, as in FIG FIG. 11A shown, consist of a single component in the circumferential direction 26. It should be noted that the FIGS. 9A-9D , 11A and 11B show greatly simplified compressor housings 310 with likewise greatly simplified flow modifying devices 10.

The FIGS. 9A-9D however show how the cylindrical housing section 150 can comprise a plurality of subdivision sections 159 in the axial direction 22. These dividing sections 159 in the axial direction 22 can also be referred to as axial dividing sections 159. In particular, the cylindrical housing section 150 can consist of a first dividing section 159a in the axial direction 22 and a second dividing section 159a in the axial direction 22 (see FIG FIGS. 9C and 9D ). The first axial subdivision section 159a and the second axial subdivision section 159b are designed in particular in the form of a ring. The first axial dividing section 159a and the second axial dividing section 159b are designed in such a way that they separate the pockets 200 at their lowest point. In other words, this means that the first axial subdivision section 159a and the second axial subdivision section 159b subdivide the pockets 200 at the change point 224. This has advantages in terms of manufacturing technology in particular, such as simplified accessibility to the pocket 200.

As in the FIGS. 9A and 9B As can be seen, one of the first axial dividing portion 159 a and the second axial dividing portion 159 b can be manufactured integrally with the compressor housing 310. In such embodiments, the other of the first axial dividing portion 159a and the second axial dividing portion 159b from the compressor inlet 312 in the axial direction 22 to the Compressor outlet 314 or from the compressor outlet 314 in the axial direction 22 to the compressor inlet 312 in the compressor housing 310. This also applies in an analogous manner to a cylindrical housing section 150 with a first axial subdivision section 159a and a second axial subdivision section 159b, none of which is manufactured integrally with the compressor housing 310. Here, for example, both the first axial dividing section 159a and the second axial dividing section 159b can be inserted into the compressor housing 310 from the compressor inlet 312 in the axial direction 22 to the compressor outlet 314 (see FIG FIG. 9C ). Alternatively, the first axial subdivision section 159a and also the second axial subdivision section 159b can be inserted into the compressor housing 310 from the compressor outlet 314 in the axial direction 22 to the compressor inlet 312. A corresponding adaptation of the compressor housing 310 according to the respective direction of insertion of the cylindrical housing section 150 is of course and, for example, from the FIGS. 9A-9D evident. In particular, if the cylindrical housing section 150 can be inserted into the compressor housing 310 from the compressor outlet 314 in the axial direction 22 to the compressor inlet 312, the compressor contour 316 can be formed by the cylindrical housing section 150. Because this compressor contour 316 is formed on the separate cylindrical housing section 150, the geometry / surface of the compressor contour 316 is more flexible and more easily accessible for precise machining.

Basically, it should be noted that combinations of different circumferential subdivision sections 157 and axial subdivision sections 159 are also possible. For example, the first axial subdivision section 159a and / or the second axial subdivision section 159b also have two or more circumferential subdivision sections 157.

The FIGS. 10A-10D show, by way of example, various fastening devices 330 of the cylindrical housing section 150 of the flow modifying device 10 in a highly simplified form. In detail, the flow modifying device 10 can be fastened in the compressor housing 310 via its cylindrical housing section 150, if this is designed as a separate part. Various coupling technologies, such as a press fit, a snap hook connection, a screw connection or other suitable ones, are used as the fastening device 330 Technologies in question. They show FIGS. 10A and 10B Two different configurations of fastening devices 330 in the form of snap-hook connections between the cylindrical housing section 150 and the compressor housing 310. The snap-hook connection is arranged on the outer jacket surface 158. In the axial direction 22, the snap hook connection can be arranged at different positions of the cylindrical housing section 150. For example, the snap hook connection in the upstream end region 156 (not shown), in the downstream end region 154 (see FIG FIG. 10B ) or axially between the upstream end region 156 and the downstream end region 154 (see FIG FIG. 10A ). FIG. 10C shows an embodiment of the fastening devices 330 as a screw connection in which the cylindrical housing section 150 is screwed via a thread on its outer jacket surface 158 with a thread on an inner jacket surface of the compressor housing 310. FIG. 10D shows an embodiment of the fastening devices 330 as a press connection, in which the cylindrical housing section 150 is held in the compressor housing 310 with a friction fit between its outer jacket surface 158 and an inner jacket surface of the compressor housing 310. The configurations just explained also apply analogously to configurations of the flow modifying device 10 in which individual or all subdivision sections 157, 159 (if present) and not the entire cylindrical housing section 150 are manufactured separately.

If the cylindrical housing section 150 is manufactured as a separate component, it can be advantageous to manufacture the cylindrical housing section 150 from plastic. Optionally, the cylindrical housing section 150 can have an oversize 160 in the direction of the compressor wheel 320 (see FIG FIGS. 13D and 13E ). For better illustration, the FIGS. 13D and 13E only the outer contours of the compressor wheel 320 are shown in dashed lines. In the state immediately after being inserted into the compressor, the cylindrical housing section 150 has an oversize 160. In the FIG. 13D the flow modifying device 10 or the cylindrical housing section 150 is designed to be inserted into the compressor housing 310 from the compressor inlet 312 in the axial direction 22 to the compressor outlet 314. Here, the oversize 160 is formed inward in the radial direction 24. The oversize 160 is only present in a partial area of the compressor contour 316. In the FIG. 13E is the flow modifier 10 or the cylindrical housing section 150 is designed to be inserted into the compressor housing 310 from the compressor outlet 314 in the axial direction 22 to the compressor inlet 312. Here the oversize 160 is formed in the area of the compressor contour 316. In other words, this means that the oversize 160 is formed downstream in the axial direction 22 and inward in the radial direction 24. During operation of the compressor 300, the oversize 160 can be reduced, in particular grinded in or ground off, by the compressor wheel 320. This means that the compressor wheel 320, which is made of a metallic material, can remove or grind the softer and unnecessary plastic material of the cylindrical housing section 150 in the area of the oversize 160. In this way, a precisely fitting compressor contour 316 can be generated, which is shaped complementarily to the contour of the compressor wheel 320. This enables a collision-free (after grinding by the compressor wheel) rotation of the compressor wheel 320. This advantageously results in a reduced necessary manufacturing tolerance. This in turn can lead to reduced production costs and to a simplification of the entire production process.

The invention further comprises a manufacturing method of the compressor 300 or the flow modifying device 10. As already mentioned, the cylindrical housing section 150 can be provided integrally with the compressor housing 310 or as a separate component. It is also possible for only individual, several or all of the subdivision sections 157, 159 (if present) to be provided integrally with the compressor housing 310 or as separate components. If the cylindrical housing section 150 or the subdivision sections 157, 159 are provided as separate components, the pockets 200 can be produced directly with the cylindrical housing section 150 or the subdivision sections 157, 159, for example in an injection molding process. Alternatively, the pockets 200 can subsequently be introduced into the cylindrical housing section 150 or into the subdivision sections 157, 159 by removing processes. In particular, if the cylindrical housing section 150 or the subdivision sections 157, 159 (if present) are provided integrally with the compressor housing 310, the pockets 200 can be made into the cylindrical housing section 150 or the subdivision sections 157, 159 or into the Compressor housing 310 be introduced. In this regard, the FIG. 13A exemplary pockets 200 that are in an erosion process in the compressor housing 310 were introduced. The FIGS. 13B and 13C show a combination of a casting process in which a basic shape of the pockets 200 is already provided in the compressor housing 310 (see FIG FIG. 13B ), followed by a removal process, in particular a milling process, by means of which the final geometry of the pocket 200 (as described above) is generated (see FIG FIG. 13C ). That is to say, the pockets 200 can be produced by an erosion process, a casting process, an abrasive process or any combination of two or more of the above-mentioned and / or other suitable processes.

The relative position of the pockets 200 to the compressor wheel 320 is based on FIG. 5 and the detail section Y. The compressor wheel 320 comprises a plurality of blades 322 distributed in the circumferential direction 26, as is also known from the prior art. In the FIG. 5 two blades 322 are shown in this regard. Each blade 322 has a leading edge 324, a side edge 325, a trailing edge 326, a front side 327 and a rear side 328. This can be seen in detail Y, in which the compressor housing 310 or the pocket 200 is not shown along the section CC, but along a section through the orientation plane of the pocket 20. For perspective reasons, only the rear side is for one vane 322 328 and for the other blade only the front side 327 can be seen. The front side 327 and the rear side 328 can be seen relative to the direction of rotation ω of the compressor wheel 320. The pockets 200 are arranged in the axial direction 22 or at an axial position in such a way that the opening 210 of a respective pocket 200 is located both upstream and downstream of a corner 329 at which the leading edge 324 and the side edge 325 converge. In the exemplary implementation of the FIG. 5 or of the detail section Y, the pockets 200 are arranged in the axial direction 22 or at an axial position in such a way that a center of the opening 210, which lies at half the opening length 212, is located approximately at the corner 329. Other arrangements are also possible in alternative configurations. For example, a ratio between a downstream opening length 212 a, which is arranged downstream of the corner 329, to an upstream opening length 212 b, which is arranged upstream of the corner 329, can also be greater or less than 1.

As already mentioned, the angle of incidence γ is angled in a direction of rotation ω of the compressor wheel 320 from the radial direction 24. This advantageous embodiment leads to an improved fluid flow into the pocket 200. As a result, a larger volume flow can in turn be directed or recirculated through the pocket 200 back in the direction of the downstream end region 154, i.e. back to the compressor wheel 320, which in turn can increase efficiency .

The invention also relates to a charging device 400 (see FIG. 14th ). The charging device 400 includes and the compressor 300. The in FIG FIG. 14th The compressor 300 shown comprises a flow modifying device 10 and an adjusting mechanism 100. The cylindrical housing section 150 is formed integrally with the compressor housing 310. Alternatively, the cylindrical housing section 150 can also be designed as a separate component. In principle, all of the configuration variants mentioned above can be transferred to the charging device 400. For example, the compressor 300 can also only comprise a flow modifying device 10 and no adjusting mechanism 100. In the exemplary representation of the FIG. 14th the compressor 300 further comprises a compressor inlet connection 340 which is arranged in the axial direction 220 upstream of the compressor housing 310 and is fastened to the latter. The adjustment mechanism 100 is arranged axially between the compressor inlet connection 340 and the compressor housing 310. The charging device 400 further comprises a shaft 420 via which the compressor 300 and the drive unit 410 are coupled to one another in a rotationally fixed manner. In the exemplary embodiment shown, the drive device 410 is a turbine. Alternatively or additionally, however, the drive unit 410 can also comprise an electric motor. <b> List of reference symbols </b> 10 Flow modifying unit 22nd axial direction 24 radial direction 26th Circumferential direction 100 Adjustment mechanism 110 Screen elements 120 Adjustment ring 130 Bearing ring 150 cylindrical housing section 152 Inner jacket surface 153 downstream end face 154 downstream end area 155 upstream end face 156 upstream end region 157 extensive subdivision sections 158 Outer jacket surface 159 axial dividing sections 160 Excess 200 bag 202 longitudinal projection line 203 Orientation level 204 Depth projection line 207 Width of the pocket 208 Length of the bag 208a Downstream length 208b Upstream length 209 Depth of the pocket 210 opening 210a Opening contour 211 Opening area 212 Opening length 212a Downstream opening length 212b Upstream opening length 214 downstream opening area 216 upstream opening area 220 contour 222 Entry point 224 Turning point 226 Turning point 228 Exit point 232 First sidewall 234 Second side wall 300 compressor 310 Compressor housing 312 Compressor inlet 312a Inlet cross-section 314 Compressor outlet 316 Compressor contour 320 Compressor wheel 322 Shovels 324 Leading edge 325 Side edge 326 Trailing edge 327 front 328 back 329 corner 330 Fastening device 340 Compressor inlet port 400 Charging device 410 Drive unit 420 wave P Parallel to the longitudinal projection line X Cutout α downstream entry angle α ' Variable downstream angle β upstream entry angles β ' Variable upstream angle γ Angle of attack δ Tilt angle ω Direction of rotation

1. 1. Strömungsmodifiziereinrichtung (10) für einen Verdichter (300) einer Aufladevorrichtung (400) umfassend:
   • einen zylindrischen Gehäuseabschnitt (150), der eine Innenmantelfläche (152) definiert und in axialer Richtung (22) einen stromabwärtigen Endbereich (154) sowie einen stromaufwärtigen Endbereich (156) umfasst; und
   • eine Mehrzahl an Taschen (200), die in Umfangsrichtung (26) beabstandet an der Innenmantelfläche (152) angeordnet sind;
     • wobei jede Tasche (200) durch eine longitudinale Projektionslinie (202) und eine Tiefenprojektionslinie (204) definiert wird,
     • wobei in einer Orientierungsebene (203), die durch die longitudinale Projektionslinie (202) und die Tiefenprojektionslinie (204) gebildet wird, ein stromabwärtiger Eintrittswinkel (α) der Tasche (200) relativ zur Mantelinnenfläche (152) einen stromabwärtigen Öffnungsbereich (214) der Tasche (200) definiert und ein stromaufwärtiger Eintrittswinkel (β) der Tasche (200) relativ zur Mantelinnenfläche (152) einen stromaufwärtigen Öffnungsbereich (216) der Tasche (200) definiert, und
     • wobei die Tasche (200) derart ausgebildet ist, dass gilt: (β)<90°<(α).
2. 2. Strömungsmodifiziereinrichtung (10) nach Ausführungsform 1, wobei die Tasche (200) derart ausgebildet ist, dass gilt: (β)<180°-(α).
3. 3. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei 10°<(β)<30°, bevorzugt 15°<(β)<20° und besonders bevorzugt 17°≤(β)≤19° gilt.
4. 4. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei 120°<(α)<165°, bevorzugt 130°<(α)<150° und besonders bevorzugt 135°≤(α)≤145° gilt.
5. 5. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei die Tiefenprojektionslinie (204) relativ zur radialen Richtung (24) um einen Anstellwinkel (γ) geneigt ist.
6. 6. Strömungsmodifiziereinrichtung (10) nach Ausführungsform 5, wobei 0°<(γ)<60°, bevorzugt 15°<(γ)<50° und besonders bevorzugt 35°≤(γ)≤45° gilt.
7. 7. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei eine Breite (207) der Tasche (200) orthogonal zur Orientierungsebene (203) 1mm x F_D bis 6mm x F_D, bevorzugt 2mm x F_D bis 5mm x F_D und besonders bevorzugt 3mm x F_D bis 4mm x F_D beträgt, wobei F_D=D/D_Ref, wobei D_Ref bevorzugt 60mm beträgt und D einem Austrittsdurchmesser eines Verdichterrads des Verdichters (300) entspricht, für den die Strömungsmodifiziereinrichtung (10) ausgelegt ist.
8. 8. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei eine Länge (208) der Tasche (200) entlang der longitudinalen Projektionslinie (202) 5mm x F_D bis 30mm x F_D, bevorzugt 10mm x F_D bis 25mm x F_D und besonders bevorzugt 15mm x F_D bis 20mm x F_D beträgt, wobei F_D=D/D_Ref, wobei D_Ref bevorzugt 60mm beträgt und D einem Austrittsdurchmesser eines Verdichterrads des Verdichters (300) entspricht, für den die Strömungsmodifiziereinrichtung (10) ausgelegt ist.
9. 9. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei eine Tiefe (209) der Tasche (200) entlang der Tiefenprojektionslinie (204) 5mm x F_D bis 30mm x F_D, bevorzugt 10mm x F_D bis 25mm x F_D und besonders bevorzugt 15mm x F_D bis 20mm x F_D beträgt, wobei F_D=D/D_Ref, wobei D_Ref bevorzugt 60mm beträgt und D einem Austrittsdurchmesser eines Verdichterrads des Verdichters (300) entspricht, für den die Strömungsmodifiziereinrichtung (10) ausgelegt ist.
10. 10. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei die longitudinale Projektionslinie (202) relativ zur axialen Richtung (22) um einen Kippwinkel (δ) geneigt ist.
11. 11. Strömungsmodifiziereinrichtung (10) nach Ausführungsform 10, wobei 0°<(δ)<60°, bevorzugt 5°<(δ)<45° und besonders bevorzugt 10°≤(δ)≤30° gilt.
12. 12. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei die Tasche (200) eine Öffnung (210) mit einer Öffnungsfläche (211) umfasst.
13. 13. Strömungsmodifiziereinrichtung (10) nach Ausführungsform 12, wobei die Öffnung (210) eine Öffnungslänge (212) umfasst, wobei sich die Öffnungslänge (212) entlang der longitudinalen Projektionslinie (202) erstreckt und 2mm x F_D bis 25mm x F_D, bevorzugt 5mm x F_D bis 20mm x F_D und besonders bevorzugt 10mm x F_D bis 15mm x F_D beträgt, wobei der Faktor F_D=D/D_Ref, wobei D_Ref bevorzugt 60mm beträgt und D einem Austrittsdurchmesser eines Verdichterrads des Verdichters (300) entspricht, für den die Strömungsmodifiziereinrichtung (10) ausgelegt ist.
14. 14. Strömungsmodifiziereinrichtung (10) nach irgendeiner der Ausführungsformen 12 oder 13, wobei die longitudinale Projektionslinie (202) in einer Ebene liegt, die durch die Öffnungsfläche (211) definiert wird.
15. 15. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei die longitudinale Projektionslinie (202) mittig durch die Tasche (200) in Umfangsrichtung (26) gesehen, verläuft, und optional wobei die longitudinale Projektionslinie (202) mittig durch die Tasche (200) in Umfangsrichtung (26) gesehen, zwischen dem stromabwärtigen Öffnungsbereich (214) und dem stromaufwärtigen Öffnungsbereich (216) verläuft.
16. 16. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei die Tiefenprojektionslinie (204) mittig durch die Tasche (200) in Umfangsrichtung (26) gesehen, verläuft.
17. 17. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei die Tasche (200) eine Länge (208), eine Öffnung (210) mit einer Öffnungslänge (212) und eine Tiefe (209) umfasst.
18. 18. Strömungsmodifiziereinrichtung (10) nach Ausführungsform 17, wobei eine Kontur (220) der Tasche (200) durch einen Eintrittspunkt (222) an dem der strömabwärtige Eintrittswinkel (α) vorliegt, durch einen Austrittspunkt (228) an dem der stromaufwärtiger Eintrittswinkel (β) vorliegt und durch einen Wechselpunkt (224) zwischen dem Eintrittspunkt (222) und dem Austrittspunkt (228) bestimmt ist.
19. 19. Strömungsmodifiziereinrichtung (10) nach Ausführungsform 18, wobei die Kontur (220) in der Orientierungsebene (203) liegt.
20. 20. Strömungsmodifiziereinrichtung (10) nach irgendeiner der Ausführungsformen 18 oder 19, wobei der Eintrittspunkt (222) durch einen stromabwärtigen Schnittpunkt zwischen der longitudinalen Projektionslinie (202) und einer Öffnungskontur (210a) der Öffnung (210) bestimmt ist, wobei der Austrittspunkt (228) durch einen stromaufwärtigen Schnittpunkt zwischen der longitudinalen Projektionslinie (202) und der Öffnungskontur (210a) bestimmt ist, und wobei der Wechselpunkt (224) den tiefsten Punkt der Kontur (220) relativ zur longitudinalen Projektionslinie (202) darstellt.
21. 21. Strömungsmodifiziereinrichtung (10) nach irgendeiner der Ausführungsformen 18 bis 20, wobei zwischen dem Eintrittspunkt (222) und dem Wechselpunkt (224) ein erster Konturabschnitt (220a) mit einem variablen Winkel (α') und zwischen dem Wechselpunkt (224) und dem Austrittspunkt (228) ein zweiter Konturabschnitt (220b) mit einem variablen Winkel (β') ausgebildet ist.
22. 22. Strömungsmodifiziereinrichtung (10) nach Ausführungsform 21, wobei sich (α') von (α')=(α) am Eintrittspunkt (222) zu (α')=180° am Wechselpunkt (224) derart verändert, dass der Verlauf des ersten Konturabschnitts (220a) vom Eintrittspunkt (222) zum Wechselpunkt (224) keine Sprünge oder Knicke aufweist und (α') zumindest nicht kleiner wird.
23. 23. Strömungsmodifiziereinrichtung (10) nach irgendeiner der Ausführungsformen 21 oder 22, wobei sich (β)' von (β)'=180° am Wechselpunkt (224) zu (β)'=(β) am Austrittspunkt (228) derart verändert, dass der Verlauf des zweiten Konturabschnitts (220b) vom Wechselpunkt (224) zum Austrittspunkt (228) keine Sprünge oder Knicke aufweist und (β)' zumindest nicht größer wird.
24. 24. Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen, wobei die Taschen (200) äquidistant in Umfangsrichtung (26) angeordnet sind.
25. 25. Verdichter (300) für eine Aufladevorrichtung (400) umfassend:
    • ein Verdichtergehäuse (310), das einen Verdichtereinlass (312) mit einem Einlassquerschnitt (312a) und einen Verdichterauslass (314) definiert;
    • ein Verdichterrad (320), das zwischen dem Verdichtereinlass (312) und dem Verdichterauslass (314) drehbar in dem Verdichtergehäuse (310) angeordnet ist; und
    • eine Strömungsmodifiziereinrichtung (10) nach irgendeiner der vorangehenden Ausführungsformen.
26. 26. Verdichter (300) nach Ausführungsform 25, weiterhin umfassend einen Verstellmechanismus (100) mit mehreren Blendenelementen (110) zum Verändern des Einlassquerschnitts (312a).
27. 27. Verdichter (300) nach Ausführungsform 26, wobei der zylindrische Gehäuseabschnitt (150) stromabwärts der Blendenelemente (110) angeordnet ist.
28. 28. Verdichter (300) nach irgendeiner der Ausführungsformen 26 oder 27, wobei der zylindrische Gehäuseabschnitt (150) als Lagerring (130) für die Blendenelemente (110) konfiguriert ist.
29. 29. Verdichter (300) nach irgendeiner der Ausführungsformen 25 bis 28, wobei der zylindrische Gehäuseabschnitt (150) integral mit dem Verdichtergehäuse (310) gefertigt ist oder als separates Bauteil gefertigt ist.
30. 30. Verdichter (300) nach irgendeiner der Ausführungsformen 25 bis 29, wobei der zylindrische Gehäuseabschnitt (150) mehrteilig aufgebaut ist und mehrere Unterteilungsabschnitte (157) in Umfangsrichtung (26) und/oder mehrere Unterteilungsabschnitte (159) in axialer Richtung (22) umfasst.
31. 31. Verdichter (300) nach Ausführungsform 30, wobei der zylindrische Gehäuseabschnitt (150) aus einem ersten Unterteilungsabschnitt (159a) in axialer Richtung (22) und einem zweiten Unterteilungsabschnitte (159b) in axialer Richtung (22) besteht.
32. 32. Verdichter (300) nach Ausführungsform 31, wobei einer von dem ersten oder dem zweiten Unterteilungsabschnitt (159a, 159b) integral mit dem Verdichtergehäuse (310) gefertigt ist und optional, wobei der andere von dem ersten oder dem zweiten Unterteilungsabschnitt (159a, 159b) von dem Verdichtereinlass (312) in axialer Richtung (22) zu dem Verdichterauslass (314) oder von dem Verdichterauslass (314) in axialer Richtung (22) zu dem Verdichtereinlass (312) in das Verdichtergehäuse (310) einsetzbar ist.
33. 33. Verdichter (300) nach irgendeiner der Ausführungsformen 25 bis 32, wobei der zylindrische Gehäuseabschnitt (150), wenn dieser als separates Teil ausgebildet ist, durch eine Presspassung, eine Schnapphakenverbindung, eine Verschraubung oder eine andere geeignete Befestigungseinrichtung (330) mit dem Verdichtergehäuse (310) verbunden ist.
34. 34. Verdichter (300) nach irgendeiner der Ausführungsformen 25 bis 33, wobei der zylindrische Gehäuseabschnitt (150), wenn dieser als separates Teil ausgebildet ist, von dem Verdichtereinlass (312) in axialer Richtung (22) zu dem Verdichterauslass (314) oder in entgegengesetzter axialer Richtung (22) in das Verdichtergehäuse (310) einsetzbar ist.
35. 35. Verdichter (300) nach irgendeiner der Ausführungsformen 25 bis 34, wobei der zylindrische Gehäuseabschnitt (150), wenn dieser als separates Teil ausgebildet ist, aus Kunststoff hergestellt ist, und optional, wobei der zylindrische Gehäuseabschnitt (150) ein Übermaß (160) in Richtung des Verdichterrads (320) aufweist, das im Betrieb des Verdichters (300) durch das Verdichterrad (320) reduzierbar, insbesondere einschleifbar ist.
36. 36. Verdichter (300) nach irgendeiner der Ausführungsformen 25 bis 35, wobei das Verdichterrad (320) mehrere in Umfangsrichtung (26) verteilte Schaufeln (322) umfasst, wobei jede Schaufel (322) eine Anströmkante (324), eine Seitenkante (325), eine Abströmkante (326), eine Vorderseite (327) und eine Rückseite (328) aufweist.
37. 37. Verdichter (300) nach Ausführungsform 36, wobei die Taschen (200) derart in axialer Richtung (22) angeordnet sind, dass sich die Öffnung (210) einer jeweiligen Tasche (200) sowohl stromaufwärts als auch stromabwärts einer Ecke (329), an der die Anströmkante (324) und die Seitenkante (325) zusammenlaufen, befindet.
38. 38. Verdichter (300) nach Ausführungsform 37, wobei die Taschen (200) derart in axialer Richtung (22) angeordnet sind, dass sich eine Mitte der Öffnung (210), die an der halben Öffnungslänge (212) liegt, ungefähr an der Ecke (329) befindet.
39. 39. Verdichter (300) nach irgendeiner der Ausführungsformen 25 bis 38, wobei der Anstellwinkel (γ) in eine Rotationsrichtung (ω) des Verdichterrads (320) von der radialen Richtung (24) abgewinkelt ist.
40. 40. Aufladevorrichtung (400) umfassend:
    eine Antriebseinheit (410) und einen Verdichter (300) nach irgendeiner der vorangehenden Ausführungsformen, wobei die Aufladevorrichtung (400) eine Welle (420) umfasst, über die der Verdichter (300) und die Antriebseinheit (410) drehfest miteinander gekoppelt sind.
41. 41. Aufladevorrichtung (400) nach Ausführungsform 40, wobei die Antriebseinheit (410) eine Turbine und/oder einen Elektromotor umfasst.

Although the present invention has been described above and is defined in the appended claims, it should be understood that the invention may alternatively be defined in accordance with the following embodiments:

1. 1. A flow modifying device (10) for a compressor (300) of a supercharging device (400) comprising:
   • a cylindrical housing section (150) which defines an inner circumferential surface (152) and in the axial direction (22) comprises a downstream end region (154) and an upstream end region (156); and
   • a plurality of pockets (200) which are arranged spaced apart in the circumferential direction (26) on the inner circumferential surface (152);
     • each pocket (200) being defined by a longitudinal projection line (202) and a depth projection line (204),
     • wherein in an orientation plane (203) which is formed by the longitudinal projection line (202) and the depth projection line (204), a downstream entry angle (α) of the pocket (200) relative to the jacket inner surface (152) has a downstream opening area (214) of the pocket (200) defines and an upstream entry angle (β) of the pocket (200) relative to the jacket inner surface (152) defines an upstream opening area (216) of the pocket (200), and
     • wherein the pocket (200) is designed such that: (β) <90 ° <(α).
2. 2. Flow modifying device (10) according to embodiment 1, the pocket (200) being designed such that: (β) <180 ° - (α).
3. 3. Flow modifying device (10) according to any one of the preceding embodiments, where 10 ° <(β) <30 °, preferably 15 ° <(β) <20 ° and particularly preferably 17 ° (β) 19 °.
4. 4. Flow modifying device (10) according to any of the preceding embodiments, where 120 ° <(α) <165 °, preferably 130 ° <(α) <150 ° and particularly preferably 135 ° (α) 145 °.
5. 5. The flow modifier (10) according to any one of the preceding embodiments, wherein the depth projection line (204) is inclined relative to the radial direction (24) by an angle of attack (γ).
6. 6. Flow modifying device (10) according to embodiment 5, where 0 ° <(γ) <60 °, preferably 15 ° <(γ) <50 ° and particularly preferably 35 ° (γ) 45 °.
7. 7. Flow modifying device (10) according to any one of the preceding embodiments, wherein a width (207) of the pocket (200) orthogonal to the orientation plane (203) 1 mm x F _D to 6 mm x F _D , preferably 2 mm x F _D to 5 mm x F _D and particularly preferably 3mm x F _D to 4mm x F _D , where F _D = D / D _Ref , where D _{Ref is} preferably 60mm and D corresponds to an outlet diameter of a compressor wheel of the compressor (300) for which the flow modifying device (10) is designed .
8. 8. Strömungsmodifiziereinrichtung (10) according to any of the preceding embodiments, wherein a length (208) of the pocket (200) along the longitudinal projection line (202) 5mm x F _D to 30mm x F _D preferably, 10mm x F _D to 25mm x F _D and particularly preferably 15mm x F _D to 20mm x F _D , where F _D = D / D _Ref , where D _{Ref is} preferably 60mm and D corresponds to an outlet diameter of a compressor wheel of the compressor (300) for which the flow modifying device (10) is designed is.
9. 9. Strömungsmodifiziereinrichtung (10) according to any of the preceding embodiments, wherein a depth (209) of the pocket (200) along the depth projection line (204) 5mm x F _D to 30mm x F _D preferably, 10mm x F _D to 25mm x F _D and particularly preferably 15mm x F _D to 20mm x F _D , where F _D = D / D _Ref , where D _{Ref is} preferably 60mm and D corresponds to an outlet diameter of a compressor wheel of the compressor (300) for which the flow modifying device (10) is designed .
10. 10. The flow modifying device (10) according to any one of the preceding embodiments, wherein the longitudinal projection line (202) is inclined relative to the axial direction (22) by a tilt angle (δ).
11. 11. Flow modifying device (10) according to embodiment 10, where 0 ° <(δ) <60 °, preferably 5 ° <(δ) <45 ° and particularly preferably 10 ° (δ) 30 °.
12. 12. The flow modifier (10) according to any one of the preceding embodiments, wherein the pocket (200) comprises an opening (210) with an opening area (211).
13. 13. Flow modifying device (10) according to embodiment 12, wherein the opening (210) comprises an opening length (212), the opening length (212) extending along the longitudinal projection line (202) and 2mm x F _D to 25mm x F _D , preferably 5mm x F _D to 20mm x F _D, and more preferably 10mm x F _D up to 15mm x F _D is, where the factor F _D = D / D _ref, where D _Ref preferably 60mm is and D an exit diameter of a compressor wheel of the compressor (300 ) corresponds to which the flow modifying device (10) is designed.
14. 14. The flow modifier (10) of any one of embodiments 12 or 13, wherein the longitudinal projection line (202) lies in a plane defined by the opening area (211).
15. 15. The flow modifying device (10) according to any one of the preceding embodiments, wherein the longitudinal projection line (202) runs centrally through the pocket (200) in the circumferential direction (26), and optionally wherein the longitudinal projection line (202) runs centrally through the pocket (200 ) seen in the circumferential direction (26) between the downstream opening area (214) and the upstream opening area (216).
16. 16. The flow modifying device (10) according to any one of the preceding embodiments, wherein the depth projection line (204) runs centrally through the pocket (200) as seen in the circumferential direction (26).
17. 17. The flow modifier (10) according to any of the preceding embodiments, wherein the pocket (200) comprises a length (208), an opening (210) having an opening length (212) and a depth (209).
18. 18. Flow modifying device (10) according to embodiment 17, wherein a contour (220) of the pocket (200) through an entry point (222) at which the downstream entry angle (α) is present, through an exit point (228) at which the upstream entry angle (β ) is present and is determined by a changeover point (224) between the entry point (222) and the exit point (228).
19. 19. Flow modifying device (10) according to embodiment 18, wherein the contour (220) lies in the orientation plane (203).
20. 20. The flow modifying device (10) according to any one of embodiments 18 or 19, wherein the entry point (222) is determined by a downstream intersection between the longitudinal projection line (202) and an opening contour (210a) of the opening (210), the exit point (228 ) is determined by an upstream point of intersection between the longitudinal projection line (202) and the opening contour (210a), and wherein the change point (224) represents the lowest point of the contour (220) relative to the longitudinal projection line (202).
21. 21. Flow modifying device (10) according to any one of embodiments 18 to 20, wherein between the entry point (222) and the changeover point (224) a first contour section (220a) with a variable angle (α ') and between the changeover point (224) and the Exit point (228) a second contour section (220b) is formed with a variable angle (β ').
22. 22. Flow modifying device (10) according to embodiment 21, where (α ') changes from (α') = (α) at the entry point (222) to (α ') = 180 ° at the changeover point (224) in such a way that the course of the first contour section (220a) from the entry point (222) has no cracks or kinks at the changeover point (224) and (α ') at least does not become smaller.
23. 23. The flow modifying device (10) according to any one of the embodiments 21 or 22, wherein (β) 'changes from (β)' = 180 ° at the changeover point (224) to (β) '= (β) at the exit point (228) in such a way that that the course of the second contour section (220b) from the change point (224) to the exit point (228) has no cracks or kinks and (β) 'at least does not become larger.
24. 24. Flow modifying device (10) according to any one of the preceding embodiments, wherein the pockets (200) are arranged equidistantly in the circumferential direction (26).
25. 25. Compressor (300) for a charging device (400) comprising:
    • a compressor housing (310) defining a compressor inlet (312) with an inlet cross-section (312a) and a compressor outlet (314);
    • a compressor wheel (320) which is rotatably arranged in the compressor housing (310) between the compressor inlet (312) and the compressor outlet (314); and
    • a flow modifier (10) according to any one of the preceding embodiments.
26. 26. Compressor (300) according to embodiment 25, further comprising an adjusting mechanism (100) with a plurality of diaphragm elements (110) for changing the inlet cross section (312a).
27. 27. Compressor (300) according to embodiment 26, wherein the cylindrical housing section (150) is arranged downstream of the diaphragm elements (110).
28. 28. The compressor (300) according to any one of the embodiments 26 or 27, wherein the cylindrical housing section (150) is configured as a bearing ring (130) for the diaphragm elements (110).
29. 29. The compressor (300) according to any one of embodiments 25 to 28, wherein the cylindrical housing section (150) is manufactured integrally with the compressor housing (310) or is manufactured as a separate component.
30. 30. Compressor (300) according to any one of embodiments 25 to 29, wherein the cylindrical housing section (150) is constructed in several parts and comprises several subdivision sections (157) in the circumferential direction (26) and / or several subdivision sections (159) in the axial direction (22) .
31. 31. The compressor (300) according to embodiment 30, wherein the cylindrical housing section (150) consists of a first dividing section (159a) in the axial direction (22) and a second dividing section (159b) in the axial direction (22).
32. 32. Compressor (300) according to embodiment 31, wherein one of the first or the second partition section (159a, 159b) is manufactured integrally with the compressor housing (310) and optionally, the other of the first or the second partition section (159a, 159b) ) can be inserted into the compressor housing (310) from the compressor inlet (312) in the axial direction (22) to the compressor outlet (314) or from the compressor outlet (314) in the axial direction (22) to the compressor inlet (312).
33. 33. Compressor (300) according to any one of embodiments 25 to 32, wherein the cylindrical housing section (150), if this is formed as a separate part, is connected to the compressor housing by an interference fit, a snap-hook connection, a screw connection or another suitable fastening device (330) (310) is connected.
34. 34. Compressor (300) according to any one of embodiments 25 to 33, wherein the cylindrical housing section (150), if this is formed as a separate part, from the compressor inlet (312) in the axial direction (22) to the compressor outlet (314) or in opposite axial direction (22) can be inserted into the compressor housing (310).
35. 35. Compressor (300) according to any one of embodiments 25 to 34, wherein the cylindrical housing section (150), if this is formed as a separate part, is made of plastic, and optionally, wherein the cylindrical housing section (150) is oversized (160) in the direction of the compressor wheel (320), which can be reduced, in particular grinded, by the compressor wheel (320) during operation of the compressor (300).
36. 36. Compressor (300) according to any one of embodiments 25 to 35, wherein the compressor wheel (320) comprises a plurality of blades (322) distributed in the circumferential direction (26), each blade (322) having a leading edge (324), a side edge (325) , a trailing edge (326), a front side (327) and a rear side (328).
37. 37. Compressor (300) according to embodiment 36, wherein the pockets (200) are arranged in the axial direction (22) such that the opening (210) of a respective pocket (200) extends both upstream and downstream of a corner (329), at which the leading edge (324) and the side edge (325) converge.
38. 38. Compressor (300) according to embodiment 37, wherein the pockets (200) are arranged in the axial direction (22) such that a center of the opening (210), which is half the opening length (212), is approximately at the corner (329) is located.
39. 39. Compressor (300) according to any one of embodiments 25 to 38, wherein the angle of incidence (γ) is angled in a direction of rotation (ω) of the compressor wheel (320) from the radial direction (24).
40. 40. A charging device (400) comprising:
    a drive unit (410) and a compressor (300) according to any one of the preceding embodiments, wherein the charging device (400) comprises a shaft (420) via which the compressor (300) and the drive unit (410) are rotatably coupled to one another.
41. 41. Charging device (400) according to embodiment 40, wherein the drive unit (410) comprises a turbine and / or an electric motor.

Claims (15)

A flow modification device (10) for a compressor (300) of a charging device (400) comprising: a cylindrical housing section (150) which defines an inner circumferential surface (152) and in the axial direction (22) comprises a downstream end region (154) and an upstream end region (156); and a plurality of pockets (200) which are arranged spaced apart in the circumferential direction (26) on the inner circumferential surface (152); - wherein each pocket (200) is defined by a longitudinal projection line (202) and a depth projection line (204), - wherein in an orientation plane (203) which is formed by the longitudinal projection line (202) and the depth projection line (204), a downstream entry angle (α) of the pocket (200) relative to the jacket inner surface (152) has a downstream opening area (214) of the Pocket (200) defines and an upstream entry angle (β) of the pocket (200) relative to the jacket inner surface (152) defines an upstream opening area (216) of the pocket (200), and - The pocket (200) being designed such that: (β) <90 ° <(α). Flow modifying device (10) according to any one of the preceding claims, wherein 10 ° <(β) <30 °, preferably 15 ° <(β) <20 ° and particularly preferably 17 ° ((β) 19 °. Flow modifying device (10) according to any one of the preceding claims, wherein 120 ° <(α) <165 °, preferably 130 ° <(α) <150 ° and particularly preferably 135 ° ≤ (α) ≤145 ° applies. A flow modifier (10) according to any one of the preceding claims, wherein the depth projection line (204) relative to the radial direction (24) is inclined by an angle of attack (γ), and optionally, where 0 ° <(γ) <60 °, preferably 15 ° <(γ) <50 ° and particularly preferably 35 ° (γ) 45 °. A flow modifier (10) according to any one of the preceding claims, wherein the pocket (200) comprises an opening (210) with an opening area (211). The flow modifier (10) according to any one of the preceding claims, wherein the pocket (200) comprises a length (208), an opening (210) having an opening length (212) and a depth (209), and wherein a contour (220) of the Pocket (200) through an entry point (222) at which the downstream entry angle (α) is present, through an exit point (228) at which the upstream entry angle (β) is present and through a changeover point (224) between the entry point (222) and the Exit point (228) is determined, and optionally, wherein the contour (220) lies in the orientation plane (203). The flow modifier (10) according to claim 6, wherein the entry point (222) is determined by a downstream intersection between the longitudinal projection line (202) and an opening contour (210a) of the opening (210), the exit point (228) being defined by an upstream intersection between the longitudinal projection line (202) and the opening contour (210a) is determined, and wherein the change point (224) represents the lowest point of the contour (220) relative to the longitudinal projection line (202). The flow modifying device (10) according to any one of claims 6 or 7, wherein between the entry point (222) and the change point (224) a first contour section (220a) with a variable angle (α ') and between the change point (224) and the exit point ( 228) a second contour section (220b) is formed with a variable angle (β ') and optionally, where (α') varies from (α ') = (α) at the entry point (222) to (α') = 180 ° am Change point (224) changed in such a way that the course of the first contour section (220a) from entry point (222) to change point (224) has no jumps or kinks and (α ') is at least not smaller. The flow modifying device (10) according to claim 8, wherein (β) 'changes from (β)' = 180 ° at the change point (224) to (β) '= (β) at the exit point (228) in such a way that the course of the second contour section changes (220b) has no cracks or kinks from the change point (224) to the exit point (228) and (β) 'at least does not become larger. A compressor (300) for a supercharger (400) comprising: a compressor housing (310) defining a compressor inlet (312) with an inlet cross-section (312a) and a compressor outlet (314); a compressor wheel (320) which is rotatably arranged in the compressor housing (310) between the compressor inlet (312) and the compressor outlet (314); and a flow modifier (10) according to any one of the preceding claims. Compressor (300) according to claim 10, further comprising an adjusting mechanism (100) with several diaphragm elements (110) for changing the inlet cross-section (312a) and optionally,
wherein the cylindrical housing section (150) is arranged downstream of the screen elements (110). The compressor (300) according to any one of claims 10 or 11, wherein the cylindrical housing section (150) is manufactured integrally with the compressor housing (310) or is manufactured as a separate component. Compressor (300) according to any one of claims 10 to 12, wherein the cylindrical housing section (150) is constructed in several parts and comprises a plurality of subdivision sections (157) in the circumferential direction (26) and / or a plurality of subdivision sections (159) in the axial direction (22). Compressor (300) according to any one of claims 10 to 13, wherein the cylindrical housing section (150), if this is formed as a separate part, from the compressor inlet (312) in the axial direction (22) to the compressor outlet (314) or in the opposite axial direction Direction (22) can be inserted into the compressor housing (310). A charging device (400) comprising:
a drive unit (410) and a compressor (300) according to any one of the preceding claims, wherein the charging device (400) comprises a shaft (420) via which the compressor (300) and the drive unit (410) are rotatably coupled to one another.

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