Compressor Assembly for a Turbocharger

Abstract

The present invention relates to a compressor assembly for a turbocharger.

The compressor assembly (1) comprises: a spiral housing (2) with a flow channel (12) which is designed to convey a fluid which can be sucked up from outside the compressor assembly (1); a compressor outlet flange (3, 11, 16) which is fluidically connected to the spiral housing (2) via the flow channel (12), an injection device (4, 13, 20), wherein the injection device (4, 13, 20) is designed to introduce a fluid from outside the compressor assembly (1) into the flow channel (12), wherein the injection device (4) is arranged outside the flow channel (12) of the spiral housing (2).

Claims

1. A turbocharger, comprising: a spiral housing (2) with a flow channel (12) which is designed to convey a first fluid which can be sucked up from outside the compressor assembly (1) and to feed said fluid to a compressor outlet; wherein the spiral housing comprises a diffuser, a compressor outlet flange (3, 11, 16) which is arranged on the spiral housing and is adjacent to the diffuser, an injection device (4, 13, 20) for improving the load response behavior of an internal combustion engine connected to the turbo charger, wherein the injection device (4, 13, 20) is designed to introduce a second fluid from outside the compressor assembly (1) into the flow channel (12) in the diffuser, wherein the injection device (4) is arranged outside the flow channel (12) of the spiral housing (2), wherein the diffusor (5) is designed as a conical diffuser.

2. A compressor assembly (1) as claimed in claim 1, characterized in that the injection device (4) is at least partially incorporated in the spiral housing (2), and in that the injection device (4) comprises at least one opening (6) to the flow channel (12) so that the second fluid can be introduced from outside the compressor assembly (1) into the flow channel (12) by the injection device (4).

3. The compressor assembly (1) as claimed in claim 1, characterized in that the injection device (4) comprises a fluid channel (13).

4. The compressor assembly (1) as claimed in claim 1, characterized in that the injection device (4, 13, 20) is attached to an outer wall (7) of the spiral housing (2) so that a second fluid can be introduced from outside the compressor assembly (1) via the injection device (4) into the flow channel (12) through an opening (6) in the spiral housing (2).

5. The compressor assembly (1) as claimed in claim 4, characterized in that the outer wall (7) of the spiral housing (2), to which outer wall the injection device (4) is attached, forms part of an outer wall (8) of the diffuser (5).

6. The compressor assembly (1) as claimed in claim 1, characterized in that the compressor outlet flange (11) at least partially comprises an injection device (13) so that a second fluid can be introduced from outside the compressor assembly (1) by the injection device (13) into the flow channel (12) of the spiral housing (2).

7. The compressor assembly (1) as claimed in claim 6, characterized in that the injection device (20) comprises a fluid channel (23) in the compressor outlet flange (11), wherein the fluid channel (23) comprises a first opening (24) and a second opening (25), wherein a second fluid can be introduced from outside the compressor assembly (1) into the fluid channel (23) via the first opening (24) of the fluid channel (23), and wherein the second opening (25) of the fluid channel (23) fluidically connects the fluid channel (23) to the flow channel (12) of the spiral housing (2) so that the introduced second fluid can be introduced into the flow channel (12).

8. The compressor assembly (1) as claimed in claim 7, characterized in that a portion of the fluid channel (23) is formed by a connection piece (18) which is connectable to the compressor outlet flange (16).

9. The compressor assembly (1) as claimed in one of the preceding claims, characterized in that the injection device (4, 13, 20) has a reservoir (19) for storing the second fluid and for the uniform distribution of the second fluid over the circumference of the flow channel (12), wherein the reservoir (19) comprises part of the fluid channel (13, 23).

10. The compressor assembly (1) as claimed in one of the preceding claims, characterized in that the injection device (4, 13, 20) comprises a connection element (14) so that the second fluid can be introduced from outside the compressor assembly (1) into the injection device (4) via an injection element which is insertable into the connection element (14) and is designed a as a nozzle.

11. The compressor assembly (1) as claimed in one of the preceding claims, characterized in that the injection device (4, 13, 20) is of nozzle-shaped design.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The invention is described below with reference to exemplary embodiments which are explained in more detail with reference to drawings, in which:

[0022] FIG. 1 shows a compressor assembly with an injection device in a sectional view according to a first embodiment of the present invention;

[0023] FIG. 2 shows a cutout of a compressor outlet flange with an integrated injection device according to a second embodiment of the present invention;

[0024] FIG. 3 shows a cutout of a compressor outlet flange with an injection device according to a third embodiment of the present invention;

[0025] FIG. 4 shows an exterior view of an exhaust gas turbocharger with a filter sound absorber, compressor outlet housing (spiral housing), a bearing housing, a gas outlet housing and a gas inlet housing.

[0026] In the description below, identical reference signs are used for parts which are identical and act in an identical manner.

DETAILED DESCRIPTION OF THE DRAWINGS

[0027] FIG. 4 shows an exhaust gas turbocharger with an axial turbine and a radial compressor. The housing parts which can be seen in the exterior view are as follows, from left to right: the filter sound absorber 9 is located on the air inlet side of the compressor. The air sucked up via the filter sound absorber is guided through a central opening in the filter sound absorber into the adjacent compressor housing having the spiral housing 2. Indicated at the upper edge of the spiral housing is the compressor outlet flange 3 which is provided for the fastening of a pipe with which the compressed air is fed to an internal combustion engine. The compressor is driven via an exhaust gas turbocharger shaft which is mounted rotatably in the bearing housing 10. The shaft is driven by a turbine wheel which is arranged in the turbine housing. The turbine housing comprises a gas outlet housing 30 and a gas inlet housing 31 which, in the embodiment illustrated, is designed with two pipes.

[0028] FIG. 1 shows, in a section perpendicular to the shaft axis of the exhaust gas turbocharger through the spiral housing of a compressor assembly. The compressor assembly 1 comprises the spiral housing 2 with a flow channel 12, wherein the flow channel 12 is designed to convey a first fluid, such as, for example, air, which can be sucked up from outside the compressor assembly 1. The compressor assembly 1 furthermore comprises a compressor outlet flange 3 which is fluidically connected to the spiral housing 2 via the flow channel 12. The compressor assembly 1 furthermore comprises a diffuser 5. The diffuser 5 is fluidically connected to the compressor outlet flange 3 via the flow channel 12.

[0029] However, the diffuser 5 is also fluidically connected to the spiral housing 2 via the flow channel 12. The diffuser can also be designed here as a conical diffuser. The injection device 4 is designed to introduce a second fluid from outside the compressor assembly 1 into the flow channel 12. The injection device 4 is arranged outside the flow channel 12 of the spiral housing 2 in FIG. 1. The injection device 4 comprises a connection element 14 for the supply of a second fluid, and a fluid channel 13 through which the second fluid which can be introduced from outside the compressor assembly 1 flows. The fluid channel 13 is connected to the flow channel 12 via an opening 6 in the spiral housing. The second fluid which is injected via the fluid channel 13 therefore interacts with the first fluid in the flow channel 12 and can reinforce the swirl flow of the first fluid in the flow channel 12. In FIG. 1, the injection device 4 is partially incorporated into the spiral housing 2. In detail, the injection device 4 in FIG. 1 is attached to an outer wall 7 of the spiral housing 2 so that a second fluid can flow from outside the compressor assembly 1 via the injection device 4 into the flow channel 12 through the opening 6 in the spiral housing 2. In FIG. 1, the outer wall 7 of the spiral housing 2, to which outer wall the injection device 4 is attached, forms part of an outer wall 8 of the diffuser 5. The compressor assembly according to the embodiment of FIG. 1 can be part of a turbocharger (not illustrated).

[0030] FIG. 2 shows a cutout of a compressor outlet flange 11 with an injection device 13 integrated in the compressor outlet flange 11. Alternatively, the injection device 13 can also be incorporated only partially (not illustrated) into the compressor outlet flange 11 so that a second fluid can be introduced from outside the compressor assembly 1 into the flow channel 12 of the spiral housing 2 by the injection device 13. The injection device 13 comprises a fluid channel 23 in the compressor outlet flange 11, wherein the fluid channel 23 comprises a first opening 24 and a second opening 25, wherein a second fluid can be introduced from outside the compressor assembly 1 into the fluid channel 23 via the first opening 24 of the fluid channel 23, and wherein the second opening 25 of the fluid channel 23 fluidically connects the fluid channel 23 to the flow channel 12 of the spiral housing 2 so that the introduced second fluid can be introduced into the flow channel 12. In FIG. 2, the injection device 13 comprises a connection element 14. An injection element designed as a nozzle can be inserted into the injection device 4 in the connection element 14 so that the second fluid can be introduced from outside the compressor assembly 1 into the injection device 4. The injection device 13 can be of nozzle-shaped design here.

[0031] FIG. 3 shows a cutout of a compressor outlet flange 16 with an injection device 20 of a compressor assembly 1. The injection device 20 comprises a fluid channel 23 in the compressor outlet flange 17, wherein the fluid channel 23 comprises a first opening 24 and a second opening 25, wherein a second fluid can be introduced from outside the compressor assembly 1 into the fluid channel 23 via the first opening 24 of the fluid channel 23, and wherein the second opening 25 of the fluid channel 23 fluidically connects the fluid channel 23 to the flow channel 12 of the spiral housing 2 so that the introduced second fluid can be introduced into the flow channel 12. In contrast to FIG. 2, in the embodiment of FIG. 3, a portion of the fluid channel 23 is formed by a connection piece 18 which is connectable to the compressor outlet flange 16. This connection piece 18 can be configured here on the engine side. Also in FIG. 3, the injection device 20 comprises a connection element 14. Furthermore, the injection device 20 comprises a reservoir 19 for storing the second fluid and for the uniform distribution of the fluid over the circumference of the flow channel 12, wherein the reservoir 19 comprises part of the fluid channel 23. Also in the embodiment of FIG. 3, the injection device 20 can be of nozzle-shaped design.

[0032] In the embodiments of FIGS. 1 to 3, the injection device 4, 13, 20 can be arranged in each case in such a manner that the second fluid which can be introduced into the flow channel 12 by the injection device 4, 13, 20 optimally follows a swirl flow of the first fluid in the flow channel 12 of the compressor assembly 1 in order to reinforce the swirl flow of the first fluid.

[0033] In addition, in the embodiments of FIGS. 1 to 3, the fluid channel 13, 23 can form the contour for the nozzle.

LIST OF REFERENCE SIGNS

[0034] 1 compressor assembly with diffuser

[0035] 2 spiral housing of the compressor assembly (compressor outlet housing)

[0036] 3 compressor outlet flange

[0037] 4 injection device

[0038] 5 diffuser

[0039] 6 opening in the spiral housing

[0040] 7 outer wall of the spiral housing

[0041] 8 outer wall of the diffuser

[0042] 9 filter sound absorber at the input of the compressor

[0043] 10 bearing housing for the mounting of the shaft of the exhaust gas turbocharger

[0044] 11 compressor outlet flange

[0045] 12 flow channel

[0046] 13 fluid channel of the injection device

[0047] 14 connection element for supply of fluid

[0048] 16 compressor outlet flange with connection piece

[0049] 17 compressor outlet flange

[0050] 18 connection piece

[0051] 19 reservoir

[0052] 20 injection device

[0053] 23 fluid channel of the injection device

[0054] 24 first opening of the injection device

[0055] 25 second opening of the injection device

[0056] 30 gas outlet housing of the turbine of the exhaust gas turbocharger

[0057] 31 gas inlet housing of the turbine of the exhaust gas turbocharger