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Title:
COMPRESSOR ASSEMBLY FOR A CHARGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/040701
Kind Code:
A1
Abstract:
The invention relates to a compressor assembly for a charging device comprising a compressor housing and a compressor wheel with a plurality of blades which is arranged in the compressor housing to rotate about a compressor axis. At least one part of a recirculating channel is formed in the compressor housing radially outside of an inlet area of the compressor housing. A plurality of guide blades is arranged at an upstream end of the recirculating channel. The guide blades are arranged inclined in the radial direction so that they set a recirculating airflow into rotation in the recirculating channel, said rotation corresponding in its direction of rotation to the direction of rotation of the compressor wheel.

Inventors:
DIETRICH, Konstantin (Rulaenderstrasse 17, Mainz, Mainz, DE)
FLORY, Mario (Mainstrasse 38, Mainz, Mainz, DE)
Application Number:
US2018/047672
Publication Date:
February 28, 2019
Filing Date:
August 23, 2018
Export Citation:
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Assignee:
BORGWARNER INC. (Patent Department, 3850 Hamlin RoadAuburn Hills, Michigan, 48326, US)
International Classes:
F04D27/02; F02B33/40; F04D29/42; F04D29/44; F04D29/68
Foreign References:
EP2803866A12014-11-19
DE102009019754A12010-11-04
DE19823274C11999-10-14
US20150377240A12015-12-31
US20160017791A12016-01-21
Other References:
None
Attorney, Agent or Firm:
LAPRAIRIE, David et al. (Howard & Howard Attorneys PLLC, 450 West Fourth StreetRoyal Oak, Michigan, 48067, US)
Download PDF:
Claims:
Claims

A compressor assembly (10) for a charging device comprising

a compressor housing (100); and

a compressor wheel (200) with a plurality of blades (210) which are arranged in the compressor housing (100) to rotate about a compressor axis (400);

wherein at least one part of a recirculating channel (120) is formed in the compressor housing (100) radially outside of an inlet area (110) of the compressor housing (100),

wherein a plurality of guide blades (510, 610) is located on an upstream end (122) of recirculating channel (120),

characterized in that the guide blades (510; 610) are arranged inclined in the radial direction so that they set a recirculating airflow into rotation in the recirculating channel (120), said rotation corresponding in its direction of rotation to the direction of rotation of the compressor wheel (200).

2. The compressor assembly according to Claim 1, characterized in that an intake tube (500) is additionally provided, wherein the intake tube (500) is coupled to the compressor housing (100) at an upstream end of the compressor housing (100).

The compressor assembly according to Claim 2, characterized in that the guide blades (510; 610) are arranged between the intake tube (500) and the compressor housing (100).

The compressor assembly according to Claim 2 or Claim 3, characterized in that the guide blades (510) are formed as an integral component of the intake tube (500).

5. The compressor assembly according to Claim 2 or Claim 3, characterized in that the compressor assembly (10) additionally comprises a ring insert (600), wherein the ring insert (600) includes the guide blades (610). The compressor assembly according to Claim 5, characterized in that the ring insert (600) has a first support ring (620, 630), wherein the guide blades (610) are arranged on the first support ring (620) distributed across the periphery; and optionally, wherein the ring insert (600) additionally has a second support ring (630), wherein the guide blades (610) are arranged between the first support ring (620) and the second support ring (630).

7. The compressor assembly according to any one of the preceding claims, characterized in that the guide blades (510; 610) are arranged exclusively on the upstream end (122) of the recirculating channel (120), wherein the upstream end (122) extends in the radial direction.

The compressor assembly according to any one of the preceding claims, characterized in that the guide blades (510; 610) are arranged exclusively radially outside of a radially inwardly disposed surface of a cylindrical wall (112) of the compressor housing (100), said cylindrical wall defining the inlet area (110) of the compressor housing (100).

The compressor assembly according to any one of the preceding claims, characterized in that the guide blades (510; 610) are flexible so that they may be bent over by the recirculating air in the recirculating channel (120) in order to permit a return flow of the air recirculating in the recirculating channel (120) into the inlet area (110) of the compressor housing (100).

A ring insert (600) for a compressor assembly (10) of a charging device, wherein the ring insert (600) is designed to be mounted between a compressor housing (100) and an intake tube (500) so that it is arranged in the area of an upstream end (122) of a recirculating channel (120) of the compressor housing (100),

characterized in that the ring insert (600) has at least one first support ring (610) and a plurality of guide blades (610) which are arranged on the first support ring (610), wherein the guide blades (610) are arranged inclined in the radial direction so that during use in a compressor assembly (10), they set a recirculating airflow into rotation in the recirculating channel (120), said rotation corresponding in its direction of rotation to the direction of rotation of the compressor wheel (200).

The ring insert according to Claim 10, characterized in that the ring insert (600) additionally has a second support ring (630), wherein the guide blades (610) are arranged between the first support ring (620) and the second support ring (630).

The ring insert according to Claim 11, characterized in that the first support ring (629) and/or the second support ring (630) has a radial section (622, 632) and an axial section (624, 634), wherein the axial section (624, 634) functions for centering.

The ring insert according to any one of Embodiments 10 through 12, characterized in that the ring insert (600) additionally has anti-rotation means (640).

A compressor assembly (10) for a charging device comprising

a compressor housing (100);

a compressor wheel (200) with a plurality of blades (210) which are arranged in the compressor housing (100) to rotate about a compressor axis (400); and

an intake tube (500), wherein the intake tube (500) is coupled to the compressor housing (100) on an upstream end of the compressor housing (100);

wherein at least one part of a recirculating channel (120) is formed in the compressor housing (100) radially outside of an inlet area (110) of the compressor housing (100);

characterized in that a ring insert (600) according to any one of Claims 10 through 13 is arranged between the intake tube (500) and the compressor housing (100) and also in the area of an upstream end (122) of the recirculating channel (120).

15. A charging device with a compressor assembly (10) according to any one of Claims 1 through 9 and 14.

Description:
COMPRESSOR ASSEMBLY FOR A CHARGING DEVICE

Cross-Reference to Related Applications

[0001] This application claims the benefit of German Patent Application No. 102017214813.6 filed August 24, 2017, the disclosure of which is herein incorporated by reference in its entirety.

Field of the Invention

[0002] The present invention relates to a compressor assembly for a charging device, an insert ring for a compressor assembly, and a charging device comprising a corresponding compressor assembly.

Background Information

[0003] Increasingly more vehicles of the more recent generation are equipped with charging devices. In order to achieve the target demands and the legal requirements, it is imperative to promote development in the complete drive train and also to optimize the individual components as well as the system as a whole with respect to their reliability and efficiency. [0004] Exhaust gas turbochargers are known, for example, in which a turbine with a turbine wheel is driven by the exhaust gas flow of the internal combustion engine. A compressor with a compressor wheel, which is arranged with a turbine wheel on a mutual shaft, compresses the fresh air taken in for the engine through an inlet tube. By this means, the air or oxygen amount, available to the engine for combustion, is increased, which in turn leads to an increased output of the internal combustion engine.

[0005] Compressors may also be used in electrically supported exhaust turbochargers, or decoupled from exhaust gas turbochargers, for example mechanically or electrically driven compressors, or, for example, in combination with an air supply for a fuel cell engine.

[0006] Known compressors comprise a compressor housing in which a compressor wheel is arranged. The fresh air is sucked in through a compressor inlet, accelerated by the compressor wheel, and leaves the compressor via a spiral. Each compressor has a compressor-specific compressor characteristic map, wherein the operation of the compressor is limited to the range of the compressor characteristic map between the surge limit and the choke line. Depending on the size and configuration of the compressor, the operation at low or very large volume flows through the compressor may be inefficient or no longer possible as the surge limit or the choke line is reached. It is known to provide a recirculating channel as a characteristic map stabilizing measure (KSM: ported shroud in English). By using the KSM, an expansion of the characteristic map of the charging device is achieved, by which means the compressor gains a broader spectrum of use. However, known compressors with KSM have the problem that noise emissions are increased on the one hand and the efficiency of the compressor is reduced on the other, due to the recirculating channel. [0007] The object of the present invention is thus to provide an efficient and easily manufacturable compressor assembly with KSM which simultaneously has the lowest possible noise emissions.

Brief Summary of the Invention

[0008] The present invention relates to a compressor assembly for a charging device according to Claim 1 and Claim 14, an insert ring for a compressor assembly according to Claim 10, and a charging device comprising a corresponding compressor assembly according to Claim 15.

[0009] The compressor assembly according to the invention for a charging device has a compressor housing and a compressor wheel with a plurality of blades, which is arranged in the compressor housing to rotate about a compressor axis. At least one part of a recirculating channel is formed in the compressor housing radially outside of an inlet area of the compressor housing. A plurality of guide blades is arranged at an upstream end of the recirculating channel. The guide blades are arranged inclined in the radial direction so that they set a recirculating airflow into rotation in the recirculating channel, said rotation corresponding in its direction of rotation to the direction of rotation of the compressor wheel. The recirculating channel is a characteristic map stabilizing measure (KSM: ported shroud in English) for removing flow separations, which are flowing upstream from the compressor blades back into the inlet area upstream of the compressor wheel. Due to the guide blades arranged inclined in the radial direction, this recirculating airflow recirculated through the recirculating channel is set into a rotation at the end of the recirculating channel, said rotation corresponding to the direction of rotation of the compressor wheel, so that the introduction of the recirculated recirculating airflow into the inlet area (where it is combined with the recirculating airflow that comes out of the inlet tube) occurs most harmoniously. This achieves a more harmonious recirculating airflow in the entire inlet area up to or into the compressor wheel. This means, that the invention ensures an overall more harmonious flow behavior at the compressor inlet. The more harmonious air supply achieves a greater efficiency in the compressor assembly and additionally reduces noise formation in the compressor assembly. The compressor assembly according to the invention additionally contributes to the fact that a larger compressor characteristic map may be used, since the surge limit of the compressor assembly may be displaced farther to the left, thus in the direction of a lower volume flow, in the compressor characteristic map. [0010] Another advantage of placing the guide blades only in the upstream end of the recirculating channel lies in the reduced manufacturing costs and in their fast and easy assembly.

[0011] In embodiments, the recirculating channel may have a part extending substantially axially which merges into the upstream end of the recirculating channel, said end extending substantially radially.

[0012] In embodiments, which are combinable with all previously described embodiments, an inlet tube may be additionally provided, wherein the inlet tube is coupled to the compressor housing at an upstream end of the compressor housing. At least one part of the recirculating channel may be formed in the inlet tube. The inlet tube may have a flange, wherein the part of the recirculating channel is formed in the area of the flange. The guide blades may be arranged between the intake tube and the compressor housing.

[0013] In embodiments, the guide blades may be formed as an integral component of the intake tube. This is advantageous, because the guide blades may then be manufactured integrally with the intake tube, for example, they may be molded, in particular injection molded. This means both a simple manufacturing of the guide blades as a component of the intake tube, and also a simple assembly of the compressor assembly, because no additional components need to be mounted. The intake tube and the guide blades may be manufactured from plastic material. [0014] In an alternative to the embodiment of the guide blades integrated into the intake tube, the compressor assembly may comprise a ring insert, wherein the ring insert contains the guide blades. The ring insert may be arranged between the intake tube and the compressor housing. The ring insert may have a first support ring, wherein the guide blades may be arranged distributed across the periphery on the first support ring. The guide blades and the first support ring may be formed as an integral component. Such an embodiment is advantageous, because, for example, the ring insert may then be molded, in particular injection molded. During the assembly, the ring insert may simply be inserted between the intake tube and the compressor housing and, after fastening the intake tube on the compressor housing, the ring insert is fixedly clamped between the intake tube and the compressor housing. The first support ring may have a radial section and an axial section. The axial section may function for centering. The ring insert may additionally have a second support ring, wherein the guide blades are arranged between the first support ring and the second support ring. The first support ring, the second support ring, and the guide blades may be formed as an integral component. The second support ring may have a radial section and an axial section, wherein the axial section may function for centering. [0015] In embodiments, the ring insert may additionally have at least one anti- rotation means. The at least one anti-rotation means may be provided in the form of an axially aligned pin, which extends from a radial section of one of the support rings and engages in a corresponding recess in the compressor housing or in the intake tube. Multiple anti-rotation means in the form of axially aligned pins may be provided distributed across the periphery.

[0016] In embodiments, the ring insert may be manufactured from plastic material. Alternatively, the ring insert may be manufactured from a metal.

[0017] In embodiments, which are combinable with all previously described embodiments, the guide blades are arranged exclusively on the upstream end of the recirculating channel. [0018] In embodiments, which may be combined with all previously described embodiments, the guide blades may be arranged exclusively radially outside of a radially inwardly disposed surface of a cylindrical wall of the compressor housing, said wall defining the inlet area of the compressor housing. This is advantageous, because the flow of the fresh air flowing in is only minimally affected, even at high loads (in the range of the nominal power of the motor). Thus, the guide blades only lead to very low flow losses at high loads.

[0019] In embodiments, which may be combined with all previously described embodiments, the guide blades may be flexible, so that they may be bent over by the recirculating air in the recirculating channel in order to permit a return flow of the air recirculating in the recirculating channel into the inlet area of the compressor housing.

[0020] The invention additionally comprises a ring insert for a compressor assembly of a charging device, wherein the ring insert is designed to be mounted between a compressor housing and an intake tube such that it is arranged in the area of an upstream end of an intake tube of the compressor housing. The ring insert has at least one first support ring and a plurality of guide blades which are arranged on the first support ring. The guide blades are arranged inclined in the radial direction so that during use in a compressor assembly, they set a recirculating airflow into rotation in the recirculating channel, said rotation corresponding in its direction of rotation to the direction of rotation of the compressor wheel.

[0021] In embodiments of the ring insert, the guide blades may be arranged distributed across the periphery on the first support ring.

[0022] In embodiments of the ring insert, which are combinable with all previously described embodiments, the guide blades and the first support ring may be formed as an integral component. Advantageously, for example, the ring insert may then be molded, in particular injection molded. During the assembly, the ring insert may simply be inserted between the intake tube and the compressor housing and, after fastening the intake tube on the compressor housing, the ring insert is fixedly clamped between the intake tube and the compressor housing.

[0023] In embodiments of the ring insert, which are combinable with all previously described embodiments, the first support ring may have a radial section and an axial section, wherein the axial section may function for centering.

[0024] In embodiments of the ring insert, which are combinable with all previously described embodiments, the ring insert may additionally have a second support ring, wherein the guide blades are arranged between the first support ring and the second support ring. The first support ring, the second support ring, and the guide blades may be formed in this case as an integral component. The second support ring may have a radial section and an axial section, wherein the axial section may function for centering.

[0025] In embodiments of the ring insert, which are combinable with all previously described embodiments, the ring insert may additionally have at least one anti-rotation means. The at least one anti-rotation means may be provided in the form of an axially aligned pin, which extends from a radial section of one of the support rings and engages in a corresponding recess in the compressor housing or in the intake tube. Multiple anti-rotation means in the form of axially aligned pins may be provided distributed across the periphery.

[0026] In embodiments of the ring insert, which are combinable with all previously described embodiments, the ring insert may be manufactured from plastic material. Alternatively, the ring insert may be manufactured from a metal. The ring insert may also be manufactured from a combination made of plastic material or metal. [0027] The invention additionally comprises a compressor assembly for a charging device with a compressor housing, a compressor wheel with a plurality of blades, which is arranged in the compressor housing to rotate about a compressor axis, and an intake tube, wherein the intake tube is coupled to the compressor housing at an upstream end of the compressor housing. At least one part of a recirculating channel is formed in the compressor housing radially outside of an inlet area of the compressor housing. A ring insert according to any one of the preceding embodiments is arranged between the intake tube and the compressor housing and also in the area of an upstream end of the recirculating channel.

[0028] The invention additionally comprises a charging device with a compressor assembly according to any one of the preceding embodiments. The charging device may be an exhaust gas turbocharger and additionally may comprise a turbine. The exhaust gas turbocharger may be an electrically-supported exhaust gas turbocharger and comprise an electric motor. In particular, the exhaust gas turbocharger may additionally comprise a bearing housing, wherein the electric motor is arranged in the area of the bearing housing between the turbine and the compressor. Alternatively, the charging device may comprise an electric motor and the compressor assembly may be driven purely electrically.

[0029] Additional details and features of the invention are subsequently described by way of the figures.

Brief Description of the Drawings Figure 1 shows a sectional view of one embodiment of a compressor assembly according to the invention; Figure 2 shows an exploded view of one embodiment of the compressor according to the invention;

Figure 3 shows an exploded view of another example of the compressor according to the invention;

Figure 4 shows a perspective view of one embodiment of the ring insert according to the invention.

Detailed Description of the Invention

[0030] Embodiments of the compressor assembly 10 according to the invention and of the ring insert 600 according to the invention and the compressor 10 according to the invention comprising a corresponding compressor assembly 10 are subsequently described by way of the figures. All details and advantages subsequently described apply both to compressor 10 and also to a charging device with a corresponding compressor 10. In the scope of this application, radial surfaces/planes refer to surfaces/planes that are arranged essentially orthogonal to axis of rotation 400 of compressor wheel 200 of compressor assembly 10. The radial direction is perpendicular to the direction of axis of rotation 400. The designations upstream and downstream relate to the primary flow direction in and through the compressor assembly. The primary direction of the flow in the recirculating channel is opposite to the primary flow direction.

[0031] Figure 1 shows a sectional view of one embodiment of compressor assembly 10 according to the invention. Compressor assembly 10 comprises a compressor housing 100 and a compressor wheel 200 with a plurality of blades 210. Compressor wheel 200 is arranged in compressor housing 100 to rotate about a compressor axis 400. Compressor housing 100 has an inlet area 110, through which air that is taken in enters into the compressor housing and is guided to compressor wheel 200. Compressor assembly 10 additionally comprises an intake tube 500 with a flange 520, wherein intake tube 500 is coupled on compressor housing 100 at an upstream end of compressor housing 100 in the area of flange 520.

[0032] A part of a recirculating channel 120 is formed radially outside of inlet area 110 of compressor housing 100. A second part of recirculating channel 120 is formed in flange 520 of intake tube 500. A plurality of guide blades 510, 610 is arranged on an upstream end 122 of recirculating channel 120. End 122 of recirculating channel 120, in which guide blades 510, 610 are located, extends inward in the radial direction. Guide blades 510, 610 extend radially and are arranged inclined in the radial direction. The radially inclined arrangement of guide blades 510, 610 means that the air of the recirculating airflow is guided predominantly in the radial direction between guide blades 510, 610, and the recirculating airflow gains a tangential component from guide blades 510, 610 so that the recirculating airflow is set into rotation. This means that the air flows predominantly perpendicular to axis of rotation 400 between guide blades 510, 610. In other words, the leading edges and the trailing edges of guide blades 510, 610 extend approximately parallel to axis of rotation 400 of compressor wheel 200. The leading edges and the trailing edges are thereby offset radially on the one hand and circumferentially on the other, such that the recirculating airflow is set into rotation. Expressed in other words, the leading edges of blades 510, 610 are arranged along the periphery of a first circle and the trailing edges of blades 510, 610 are arranged along the periphery of a second circle, wherein the first circle and the second circle are arranged concentrically and the first circle has a greater diameter than the second circle. The orientation of guide blades 510, 610 is selected so that the induced direction of rotation of the recirculating airflow corresponds to the direction of rotation of compressor wheel 200 during operation of compressor assembly 10. As is clear from Figure 1, guide blades 510, 610 are arranged between intake tube 500 and compressor housing 100. More precisely, guide blades 510, 610 are arranged in the area of flange 520 of intake tube 500 and between a tubular area 530 of intake tube 500 and an axial end of a cylindrical wall 112 of compressor housing 100. [0033] Recirculating channel 120 additionally functions as a characteristic map stabilizing measure (KSM: ported shroud in English) for removing flow separations, which are flowing upstream from compressor blades 210 back into inlet area 110 upstream of compressor wheel 200. Due to guide blades 510, 610 arranged inclined in the radial direction, said recirculating airflow, which is guided back through recirculating channel 120, is set into the previously specified rotation at end 122 of recirculating channel 120, said rotation corresponding to the direction of rotation of compressor wheel 200. Thus, the introduction of the recirculated recirculating airflow into inlet area 110 (where it is combined with the recirculating airflow coming from the intake tube) proceeds most harmoniously. This achieves a more harmonious recirculating airflow in entire inlet area 110 up to or into compressor wheel 200. This means, that the invention ensures an overall more harmonious flow behavior in the area of the compressor inlet. The more harmonious air supply achieves a greater efficiency of compressor assembly 10 and additionally reduces noise formation in compressor assembly 10. Compressor assembly 10 according to the invention additionally contributes to the fact that a larger compressor characteristic map may be used, since the surge limit of compressor assembly 10 may be displaced farther to the left, thus in the direction of a lower volume flow, in the compressor characteristic map.

[0034] As is clear in Figure 1, guide blades 510, 610 are located exclusively in the area of upstream end 122, which extends radially, of recirculating channel 120. The arrangement only in upstream end 122 of recirculating channel 120 advantageously affects the manufacturing costs of compressor assembly 10 with guide blades 510, 610, which may be kept very low. In addition, this type of arrangement facilitates a fast and easy assembly of compressor assembly 10 according to the invention.

[0035] Based on Figure 1, it is also clear that recirculating channel 120 is formed with an annular shape in the compressor housing. Guide blades 510, 610 are arranged distributed across the periphery of annular and radially extending end 122 of recirculating channel 120. In particular, guide blades 510, 610 are arranged uniformly distributed on the periphery. [0036] As is likewise clear from Figure 1, recirculating channel 120 has one part 124 extending substantially axially, thus a part which extends approximately parallel to axis of rotation 400. Part 124, extending substantially axially, merges into upstream end 122 of recirculating channel 120 which extends substantially radially. Recirculating channel 120 is also configured in such a way that, after entry into recirculating channel 120, a recirculating airflow is guided axially approximately parallel to yet opposite from the flow direction in inlet area 110 of compressor housing 100. Subsequently, the recirculating airflow is guided radially inward to pass over guide blades 510, 610, before it is guided back into inlet area 110 of compressor housing 100. Recirculating channel 120 has a channel section 126, oriented inclined to axis of rotation 400 and located between substantially axially extending part 124 and an upstream end 128 of recirculating channel 120; a recirculating airflow passes through said channel section first after entering into recirculating channel 120.

[0037] It may be provided that guide blades 510, 610 are arranged exclusively radially outside of a radially inwardly disposed surface of cylindrical wall 112 of compressor housing 100, said cylindrical wall defining inlet area 110 of compressor housing 100. This is advantageous, because the flow of the fresh air flowing in is only minimally affected, even at high loads (in the range of the nominal power of the motor). Thus, guide blades 510, 610 only lead to very low flow losses at high loads.

[0038] An exploded view of one embodiment of compressor assembly 10 is depicted in Figure 2. In this embodiment, guide blades 510 are formed as an integral component of intake tube 500. This is advantageous, because guide blades 510 may then be manufactured integrally with intake tube 500, for example, they may be molded, in particular injection molded. This means not only a simple manufacturing of guide blades 510 as a component of intake tube 500, but also a simple assembly of compressor assembly 10, because no additional components need to be mounted. In this case, guide blades 510 are formed upstream, contact tubular area 530 of intake tube 500, and are arranged distributed across the periphery of the end of tubular area 530 (See Figure 2). After assembly, guide blades 510 are arranged downstream and contact the axial end of cylindrical wall 112 of compressor housing 100 (compare Figure 1). Intake tube 500 and guide blades 510 may be manufactured in this case from a plastic material, for example. Alternative materials, for example, metals, may be used additionally or supplementally for intake tube 500 and/or guide blades 510.

[0039] Figure 3 shows an exploded view of an alternative embodiment of compressor assembly 10, in which guide blades 510, 610 are not integrated into intake tube 500. In this embodiment, compressor assembly 10 comprises a ring insert 600. Ring insert 600 includes guide blades 610. Ring insert 600 is arranged between intake tube 500 and compressor housing 100, see Figure 3. More precisely, ring insert 600 contacts tubular area 530 of intake tube 500 upstream in the area of flange 520 and contacts downstream on the axial end of cylindrical wall 112 of compressor housing 100. [0040] Additional details are subsequently described for ring insert 600 according to the invention, which is shown in an embodiment in an enlarged view in Figure 4. Ring insert 600 has a first support ring 620 and a second support ring 630. Guide blades 610 are arranged between first support ring 620 and second support ring 630 and are also distributed across the periphery of support rings 620, 630. Guide blades 610 are arranged inclined in the radial direction with respect to the center axis of ring insert 600. The center axis of ring insert 600 corresponds in the installed state to axis of rotation 400 (see Figure 1 and Figure 3). In particular, it may be provided that guide blades 610 and also first support ring 620 and second support ring 630 are formed as an integral component. Such a configuration is advantageous, because, for example, ring insert 600 may then be molded, in particular injection molded. During assembly, ring insert 600 may simply be inserted between intake tube 500 and compressor housing 100 and, after fastening intake tube 500 on compressor housing 100, the ring insert is fixedly clamped between intake tube 500 and compressor housing 100. First support ring 620 and second support ring 630 have a radial section 622 or 632 and an axial section 624 or 634. However, it may also be provided that neither or only one of the two support rings 620, 630 has an axial and a radial section, and the other or both support rings 620, 630 has, for example, only a radial section. The axial section(s) 624, 634 may function for centering. First support ring 620 and/or second support ring 630 (both support rings 620, 630 in Figure 4) may have, for example, an reshaped or J-shaped cross section. However, other cross sections may also be provided. Due to the L- or J-shaped cross sections of support rings 620, 630, ring insert 600 may be centered both on compressor housing 100 and also on intake tube 500. In addition, intake tube 500 may be aligned and centered with respect to compressor housing 100 with the aid of ring insert 600. As is shown in Figure 4, axial sections 624, 634 of support rings 620, 630 may contact a radially inner end of radial sections 622, 632. If no axial sections 624, 634 are provided, then the centering may be carried out using corresponding geometries on compressor housing 100 and/or intake tube 500.

[0041] Anti-rotation means 640 are likewise depicted on ring insert 600 in Figure 4. Figure 4 shows four anti-rotation means 640 on support ring 620 of ring insert 600. However, one, two, or more than four anti-rotation means 640 may also be provided. In the embodiment from Figure 4, anti-rotation means 640 are formed in the shape an axially aligned pin which extends from radial section 622 of support ring 620. In the installed state, the pins engage in a corresponding recess (not shown in the figures) in compressor housing 100 or in intake tube 500. The anti-rotation means may be provided on one or on both support rings 620, 630.

[0042] Alternatively, a ring insert may also be provided that has only one support ring. In this case, the guide blades are applied on the one support ring and arranged distributed across its periphery. The one support ring may be configured corresponding to the first and second support rings described above. In this case as well, the ring insert may be provided as a one piece, integrally-manufactured component. The one support ring may be designed to be coupled either to compressor housing 100 or to intake tube 500.

[0043] Ring insert 600 may be manufactured, for example, from a plastic material. Manufacturing from plastic material is fast, easy, and very economical (injection molding method). In particular, if an exhaust gas recirculation is additionally provided for the compressor assembly, then, however, ring insert 600 may also be manufactured from an alternative material, for example, from a metal or a ceramic or a combination of the same (also combined with a plastic material). [0044] It may be provided for all previously described embodiments of compressor assembly 10 and ring insert 600 that guide blades 510, 610 are flexible. In this case, guide blades 510, 610 may be bent over by the recirculating air in recirculating channel 120 in order to permit a return flow of the air recirculating in recirculating channel 120 into inlet area 110 of compressor housing 100. This means, they are arranged inclined in the radial direction in such a way that, if no air flows through recirculating channel 120 (the KSM), then blades 510, 610 may approximately seal recirculating channel 120. Only if an recirculating airflow presses against blades 510, 610 are these bent over so that the recirculating air arrives back into inlet area 110 of compressor assembly 10.

[0045] The invention additionally comprises a charging device with a compressor assembly according to any one of the preceding embodiments. The charging device may, for example, be an exhaust gas turbocharger and additionally may comprise a turbine. The exhaust gas turbocharger may be an electrically-supported exhaust gas turbocharger and comprise an electric motor. In particular, the exhaust gas turbocharger may additionally comprise a bearing housing, wherein the electric motor is arranged in the area of the bearing housing between the turbine and compressor assembly 10. Alternatively, the charging device may comprise an electric motor and compressor assembly 10 may be driven purely electrically.

Although the present invention has been described and is defined in the attached claims, it should be understood that the invention may also be alternatively defined according to the following embodiments: 1. A compressor assembly (10) for a charging device comprising

a compressor housing (100); and

a compressor wheel (200) with a plurality of blades (210) which are arranged in the compressor housing (100) to rotate about a compressor axis (400);

wherein at least one part of a recirculating channel (120) is formed in the compressor housing (100) radially outside of an inlet area (110) of the compressor housing (100),

wherein a plurality of guide blades (510, 610) is located on an upstream end (122) of recirculating channel (120),

characterized in that the guide blades (510; 610) are arranged inclined in the radial direction so that they set a recirculating airflow into rotation in the recirculating channel (120), said rotation corresponding in its direction of rotation to the direction of rotation of the compressor wheel (200). 2. The compressor assembly according to Embodiment 1, characterized in that the recirculating channel (120) has a part (124) extending substantially axially which merges into the upstream end (122) of the recirculating channel (120), said upstream end extending substantially radially. 3. The compressor assembly according to Embodiment 1 or Embodiment 2, characterized in that an intake tube (500) is additionally provided, wherein the intake tube (500) is coupled to the compressor housing (100) at an upstream end of the compressor housing (100). 4. The compressor assembly according to Embodiment 3, characterized in that at least one part of the recirculating channel (120) is formed in the intake tube (500). The compressor assembly according to Embodiment 4, characterized in that the intake tube (500) has a flange (520), and the part of the recirculating channel (120) is formed in the area of the flange (520). The compressor assembly according to any one of Embodiments 3 through

5, characterized in that the guide blades (510; 610) are arranged between the intake tube (500) and the compressor housing (100). The compressor assembly according to any one of Embodiments 3 through 6, characterized in that the guide blades (510) are formed as an integral component of the intake tube (500). The compressor assembly according to Embodiment 7, characterized in that the intake tube (500) and the guide blades (510) are manufactured from plastic material. The compressor assembly according to any one of Embodiments 3 through

6, characterized in that the compressor assembly (10) additionally comprises a ring insert (600), wherein the ring insert (600) includes the guide blades (610). The compressor assembly according to Embodiment 9, characterized in that the ring insert (600) is arranged between the intake tube (500) and the compressor housing (100). The compressor assembly according to Embodiment 9 or Embodiment 10, characterized in that the ring insert (600) has a first support ring (620, 630), wherein the guide blades (610) are arranged on the first support ring (620) distributed over the periphery. The compressor assembly according to Embodiment 11, characterized in that the guide blades (610) and the first support ring (620, 630) are formed as an integral component. The compressor assembly according to Embodiment 11 or Embodiment 12, characterized in that the first support ring (620) has a radial section (622) and an axial section (624), wherein the axial section (624) functions for centering.

The compressor assembly according to any one of Embodiments 11 through 13, characterized in that the ring insert (600) additionally has a second support ring (630), wherein the guide blades (610) are arranged between the first support ring (620) and the second support ring (630).

The compressor assembly according to Embodiment 14, characterized in that the first support ring (620), the second support ring (630), and the guide blades (610) are formed as an integral component.

The compressor assembly according to Embodiment 14 or Embodiment

15, characterized in that the second support ring (630) has a radial section (632) and an axial section (634), wherein the axial section (634) functions for centering.

The compressor assembly according to any one of Embodiments 9 through

16, characterized in that the ring insert (600) additionally has anti- rotation means (640).

The compressor assembly according to Embodiment 17, characterized in that the at least one anti-rotation means (640) is provided in the form of an axially aligned pin, which extends from a radial section (622, 632) of one of the support rings (620, 630) and engages in a corresponding recess in the compressor housing (100) or in the intake tube (500).

The compressor assembly according to Embodiment 18, characterized in that multiple anti-rotation means (640) in the form of axially aligned pins are provided distributed over the periphery. The compressor assembly according to any one of Embodiments 9 through 19, characterized in that the ring insert (600) is manufactured from plastic material, or characterized in that the ring insert (600) is manufactured from a metal.

The compressor assembly according to any one of the preceding embodiments, characterized in that the guide blades (510; 610) are arranged exclusively on the upstream end (122) of the recirculating channel (120).

The compressor assembly according to any one of the preceding embodiments, characterized in that the guide blades (510; 610) are arranged exclusively radially outside of a radially inwardly disposed surface of a cylindrical wall (112) of the compressor housing (100), said cylindrical wall defining the inlet area (110) of the compressor housing (100).

The compressor assembly according to any one of the preceding embodiments, characterized in that the guide blades (510; 610) are flexible so that they may be bent over by the recirculating air in the recirculating channel (120) in order to permit a return flow of the air recirculating in the recirculating channel (120) into the inlet area (110) of the compressor housing (100).

A ring insert (600) for a compressor assembly (10) of a charging device, wherein the ring insert (600) is designed to be mounted between a compressor housing (100) and an intake tube (500) so that it is arranged in the area of an upstream end (122) of a recirculating channel (120) of the compressor housing (100),

characterized in that the ring insert (600) has at least one first support ring (610) and a plurality of guide blades (610) which are arranged on the first support ring (610), wherein the guide blades are arranged inclined in the radial direction so that during use in a compressor assembly (10), they set a recirculating airflow into rotation in the recirculating channel (120) said rotation corresponding in its direction of rotation to the direction of rotation of the compressor wheel (200).

The ring insert according to Embodiment 24, characterized in that the guide blades (610) are arranged on the first support ring (620) distributed over the periphery.

The ring insert according to Embodiment 24 or Embodiment 25, characterized in that the guide blades (610) and the first support ring (620, 630) are formed as an integral component.

The ring insert according to any one of Embodiments 24 through 26, characterized in that the first support ring (620) has a radial section (622) and an axial section (624), wherein the axial section (624) functions for centering.

The ring insert according to any one of Embodiments 24 through 27, characterized in that the ring insert (600) additionally has a second support ring (630), wherein the guide blades (610) are arranged between the first support ring (620) and the second support ring (630).

The ring insert according to Embodiment 28, characterized in that the first support ring (620), the second support ring (630), and the guide blades (610) are formed as an integral component.

The ring insert according to Embodiment 28 or Embodiment 29, characterized in that the second support ring (630) has a radial section (632) and an axial section (634), wherein the axial section (634) functions for centering.

The ring insert according to any one of Embodiments 24 through 30, characterized in that the ring insert (600) additionally has at least one anti- rotation means (640). The ring insert according to Embodiment 31, characterized in that the at least one anti-rotation means (640) is provided in the form of an axially aligned pin, which extends from a radial section (622, 632) of one of the support rings (620, 630) and engages in a corresponding recess in the compressor housing (100) or in the intake tube (500).

The ring insert according to Embodiment 32, characterized in that multiple anti-rotation means (640) in the form of axially aligned pins are provided distributed over the periphery.

The ring insert according to any one of Embodiments 24 through 33, characterized in that the ring insert (600) is manufactured from plastic material, or characterized in that the ring insert (600) is manufactured from a metal.

A compressor assembly for a charging device comprising

a compressor housing (100);

a compressor wheel (200) with a plurality of blades (210) which are arranged in the compressor housing (100) to rotate about a compressor axis (400); and

an intake tube (500), wherein the intake tube (500) is coupled to the compressor housing (100) on an upstream end of the compressor housing (100);

wherein at least one part of a recirculating channel (120) is formed in the compressor housing (100) radially outside of an inlet area (110) of the compressor housing (100);

characterized in that a ring insert (600) according to any one of Embodiments 24 through 34 is arranged between the intake tube (500) and the compressor housing (100) and also in the area of an upstream end (122) of the recirculating channel (120).

A charging device with a compressor assembly (10) according to any one of Embodiments 1 through 23 and 35. The charging device according to Embodiment 36, characterized in that the charging device is an exhaust gas turbocharger and additionally comprises a turbine.

The charging device according to Embodiment 37, characterized in that the exhaust gas turbocharger is an electrically supported exhaust gas turbocharger and comprises an electric motor, in particular wherein the exhaust gas turbocharger additionally comprises a bearing housing, in particular wherein the electric motor is arranged in the area of the bearing housing between the turbine and the compressor assembly (10).

A charging device according to Embodiment 36, characterized in that the charging device comprises an electric motor, and the compressor assembly (10) is driven purely electrically.