SPLIT NOZZLE RING TO CONTROL EGR AND EXHAUST FLOW

• US 20150345316A1
• Filed: 12/19/2013
• Published: 12/03/2015
• Est. Priority Date: 01/14/2013
• Status: Active Grant

• Current Assignee: BorgWarner Incorporated
• Original Assignee: BorgWarner Incorporated
• Inventors: HENDERSON, Kurt, VEMULA, Rajendra
• Granted Patent: US 9,995,158 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01D 17/105 by passing part of the fluid
• CPC Class Codes: F01D 9/026 Scrolls for radial machines or engines
• CPC Class Codes: F02B 37/013 with exhaust-driven pumps arranged in series
• CPC Class Codes: F05D 2220/40 in turbochargers

Abstract

A turbocharger (10) for an internal combustion engine includes a symmetric twin-volute turbine housing (12) having first and second volutes (16, 18). A turbine wheel (22) is disposed within the symmetric twin-volute turbine housing (12) for rotation about a turbocharger axis (R1). A nozzle ring (42, 58) is fixedly secured to the symmetric twin-volute turbine housing (12). The nozzle ring (42, 58) includes a plurality of fixed vanes (44, 62, 66) disposed circumferentially around the turbocharger axis (R1). The plurality of fixed vanes (44, 62, 66) form nozzle passages leading from at least one of the first and second volutes (16, 18) to the turbine wheel (22) for directing exhaust gas against the turbine wheel (22) at an optimum angle.

Claims

1. A turbocharger (10) for an internal combustion engine comprising:

a twin-volute turbine housing (12) including first and second volutes (16, 18);

a turbine wheel (22) disposed within said twin-volute turbine housing (12) for rotation about a turbocharger axis (R1); and

a nozzle ring (42, 58) fixedly secured to said twin-volute turbine housing (12), said nozzle ring (42, 58) including a plurality of fixed vanes (44, 62, 66) disposed circumferentially around said turbocharger axis (R1), wherein said plurality of fixed vanes (44, 62, 66) form nozzle passages leading from at least one of said first and second volutes (16, 18) to said turbine wheel (22) for directing exhaust gas against said turbine wheel (22) at an optimum angle.

2. The turbocharger (10) as set forth in claim 1 wherein said first and second volutes (16, 18) are symmetric.

3. The turbocharger (10) as set forth in claim 2 wherein said plurality of fixed vanes (44) form nozzle passages leading from one of said first and second volutes (16, 18) to said turbine wheel (22).

4. The turbocharger (10) as set forth in claim 3 wherein said plurality of fixed vanes (44) promote exhaust gas recirculation.

5. The turbocharger (10) as set forth in claim 4 wherein said nozzle ring (42) is disposed axially between said first and second volutes (16, 18).

6. The turbocharger (10) as set forth in claim 2 wherein said nozzle ring (58) includes a first side (60) having said plurality of fixed vanes (62) and a second side (64), opposite said first side (60), having said plurality of fixed vanes (66).

7. The turbocharger (10) as set forth in claim 6 wherein said plurality of fixed vanes (62) form nozzle passages leading from said first volute (16) to said turbine wheel (22), and wherein said plurality of fixed vanes (66) form nozzle passages leading from said second volute (18) to said turbine wheel (22).

8. The turbocharger (10) as set forth in claim 7 wherein a vane count of said plurality of fixed vanes (62) does not equal a vane count of said plurality of fixed vanes (66).

9. The turbocharger (10) as set forth in claim 8 wherein said plurality of fixed vanes (62) promote exhaust gas recirculation, and wherein said plurality of fixed vanes (66) promote a high turbine output.

10. The turbocharger (10) as set forth in claim 9 wherein said nozzle ring (58) is disposed axially between said first and second volutes (16, 18).

11. A turbine housing (12) for a turbocharger (10), said turbine housing (12) comprising:

a pair of symmetric volutes defining a first volute (16) and a second volute (18);

a turbine wheel (22) disposed within said turbine housing (12) for rotation about a turbocharger axis (R1); and

a nozzle ring (42) fixedly secured to said turbine housing (12), said nozzle ring (42) including a plurality of fixed vanes (44) disposed circumferentially around said turbocharger axis (R1), wherein said plurality of fixed vanes (44) form nozzle passages leading from one of said first and second volutes (16, 18) to said turbine wheel (22) for directing exhaust gas against said turbine wheel (22) at an optimum angle.

12. A turbine housing (12) for a turbocharger (10), said turbine housing (12) comprising:

a pair of symmetric volutes defining a first volute (16) and a second volute (18);

a turbine wheel (22) disposed within said turbine housing (12) for rotation about a turbocharger axis (R1); and

a nozzle ring (58) fixedly secured to said turbine housing (12), said nozzle ring (58) including a first side (60) having a plurality of first fixed vanes (62) disposed circumferentially around said turbocharger axis (R1) and a second side (64) having a plurality of second fixed vanes (66) disposed circumferentially around said turbocharger axis (R1), wherein said plurality of first fixed vanes (62) form nozzle passages leading from said first volute (16) to said turbine wheel (22) for directing exhaust gas against said turbine wheel (22) at an optimum angle, and wherein said plurality of second fixed vanes (66) form nozzle passages leading from said second volute (18) to said turbine wheel (22) for directing exhaust gas against said turbine wheel (22) at an optimum angle.

13. The turbine housing (12) as set forth in claim 12 wherein a vane count of said plurality of first fixed vanes (62) does not equal a vane count of said plurality of second fixed vanes (66).

14. The turbine housing (12) as set forth in claim 13 wherein said plurality of first fixed vanes (62) promote exhaust gas recirculation, and wherein said plurality of second fixed vanes (66) promote a high turbine output.

15. The turbine housing (12) as set forth in claim 14 wherein said nozzle ring (58) is disposed axially between said first and second volutes (16, 18).