Two-stage supercharging exhaust turbocharger

• US 8,844,285 B2
• Filed: 10/03/2008
• Issued: 09/30/2014
• Est. Priority Date: 10/12/2007
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: An, Byeongil
• Primary Examiner(s): Bomberg, Kenneth
• Assistant Examiner(s): DAVIS, MARY ALICE
• Application Number:
  US12/524,394
• Publication Number:
  US 20100095672A1
• Time in Patent Office: 2,188 Days
• Field of Search: 606/12, 606/052, 123/562
• US Class Current: 60/605.2
• CPC Class Codes: F01D 17/105 by passing part of the fluid
• CPC Class Codes: F01D 25/24 Casings modified for heating or cooling F01D25/14; Casing parts, e.g. diaphragms, casing fastenings casings for rotary machines or engines in general F16M ; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045
• CPC Class Codes: F01N 13/10 of exhaust manifolds with cooling jacket F01N3/046
• CPC Class Codes: F02B 37/004 with exhaust drives arranged in series
• CPC Class Codes: F02B 37/013 with exhaust-driven pumps arranged in series
• CPC Class Codes: F02B 37/02 Gas passages between engine outlet and pump drive, e.g. reservoirs
• CPC Class Codes: F02B 37/183 Arrangements of bypass valves or actuators therefor
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F02M 26/16 with EGR valves located at or near the connection to the exhaust system
• CPC Class Codes: F05D 2230/21 by casting
• CPC Class Codes: F05D 2270/58 by mechanical means, e.g. levers, gears or cams
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A two-stage supercharging exhaust turbocharger includes: a high-pressure-stage supercharger having a high-pressure turbine driven by exhaust gas discharged from an exhaust manifold of an engine; a low-pressure-stage supercharger having a low-pressure turbine driven by the exhaust gas used to drive the high-pressure-stage supercharger, the high-pressure-stage supercharger and the low-pressure-stage supercharger being arranged in series in an exhaust gas passageway; and an exhaust gas control valve configured to selectively change flow rates of the exhaust gas passageways of the high-pressure-stage supercharger and the low-pressure-stage supercharger, wherein an exhaust manifold incorporating casing is configured by integrally forming the exhaust manifold, a high-pressure turbine housing of the high-pressure-stage supercharger, and a valve casing accommodating the exhaust gas control valve.

Claims

1. A two-stage supercharging exhaust turbocharger comprising:

a high-pressure-stage supercharger having a high-pressure turbine driven by exhaust gas discharged from an exhaust manifold of an engine;

a low-pressure-stage supercharger having a low-pressure turbine driven by the exhaust gas used to drive the high-pressure-stage supercharger, the high-pressure-stage supercharger and the low-pressure-stage supercharger being arranged in series in an exhaust gas passageway; and

an exhaust gas control valve configured to selectively change flow rates of the exhaust gas passageways of the high-pressure-stage supercharger and the low-pressure-stage supercharger,

wherein an exhaust manifold incorporating casing is configured by integrally forming the exhaust manifold, a high-pressure turbine housing of the high-pressure-stage supercharger having a rotary center line extending in parallel to a center line of the exhaust manifold, and a valve casing, accommodating the exhaust gas control valve, is disposed such that a center line of the exhaust gas control valve crosses the center line of the exhaust manifold and the rotary center line of the high-pressure turbine housing,

the exhaust manifold incorporating casing comprises a single cast body structure and is provided with a plurality of exhaust inlet flanges of respective cylinders of the engine, wherein a flange surface of each exhaust inlet flange is a surface at right angle to a flange surface of the high-pressure housing, and

the valve casing is provided with an attachment surface facing downward, and the low-pressure -stage supercharger is mounted on the attachment surface at a position lower than the valve casing, and the valve casing has a first port and a second port for discharging the exhaust gas to an outside of the valve casing, and the first port discharges the exhaust gas to the low-pressure turbine.

2. The two-stage supercharging exhaust turbocharger according to claim 1, wherein the valve casing includes an exhaust gas passageway opened or closed by the exhaust gas control valve and disposed on the side of the exhaust manifold and an exhaust gas passageway disposed on the side of a low-pressure turbine inlet of the low-pressure-stage supercharger.

3. The two-stage supercharging exhaust turbocharger according to claim 1, wherein a low-pressure inlet casing of the low-pressure-stage supercharger is directly connected to a lower portion of the exhaust manifold incorporating casing.

4. The two-stage supercharging exhaust turbocharger according to claim 1, wherein the second port discharged the exhaust gas to an EGR pipe.

5. The two-stage supercharging exhaust turbocharger according to claim 1, wherein the valve casing forming the exhaust gas manifold incorporating casing is disposed in an exhaust gas discharge side of the high-pressure turbine housing, and along the center line of the exhaust manifold and alongside the high-pressure turbine housing in a horizontal direction.