EP1473504A1 - Exhaust manifold for an engine - Google Patents

Exhaust manifold for an engine Download PDF

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Publication number
EP1473504A1
EP1473504A1 EP02075220A EP02075220A EP1473504A1 EP 1473504 A1 EP1473504 A1 EP 1473504A1 EP 02075220 A EP02075220 A EP 02075220A EP 02075220 A EP02075220 A EP 02075220A EP 1473504 A1 EP1473504 A1 EP 1473504A1
Authority
EP
European Patent Office
Prior art keywords
exhaust manifold
elbow
bent portion
tubular portion
engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02075220A
Other languages
German (de)
French (fr)
Inventor
Georges Bouraad
Jean-Francois Preuhs
Befrui Bizhan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1473504A1 publication Critical patent/EP1473504A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds

Definitions

  • the present invention relates to an exhaust manifold for an internal combustion engine.
  • Exhaust manifolds for engines may include a bent portion.
  • Such a bent portion may induce flow separation at the inner radius surface of the bent portion.
  • the flow separation can have an effect on the efficiency of the catalytic converter (downstream of the bent portion) because of non-uniform exhaust gas flow and pressure loss.
  • An exhaust manifold in accordance with the present invention is characterised by the features specified in claim 1.
  • the present invention overcomes the problem of flow separation.
  • the exhaust manifold 10 comprises, sequentially, an inlet 12; a first tubular portion 14; a bent portion 16; a second tubular portion 18; and an outlet 20.
  • the bent portion 16 comprises an expanded portion or elbow 22 and an adjacent inflexion 24 at the outer radius surface 26 of the bent portion.
  • the inflexion 24 is located between the elbow 22 and the second tubular portion 18.
  • the elbow 22 has an enlarged diameter relative to the first and second tubular portions 14, 18 to define a concave inner surface which is substantially hemispherical in shape.
  • the inflexion 24 is a line where the curvature of a portion of the inner surface changes from concave to convex.
  • the combination of the elbow 22 and the inflexion 24 collectively enforce a reverse flow of exhaust gases passing through the manifold 10 with minimal flow separation.
  • Such an arrangement substantially prevents the common flow separation at the inner-radius surface of the bent portion 16, through optimal opposing pressure fields.
  • the prevention of the flow separation at the bent portion 16 results in an improvement in the exhaust gas flow profile (uniform distribution and directional angle) with consequent improvement of the catalytic converter flow uniformity index and pressure loss, thereby providing improvements in emission conversion, converter aging, as well as engine power/torque performance.
  • the present invention provides an exhaust manifold which offers a solution to the problem of flow through broad acute-to-obtuse (in the range 60-120 degrees) bends, where flow separation within the bent portion may result in downstream flow mal-distribution, turbulence and pressure loss. This is particularly important where a close-coupled catalytic converter is positioned in the exhaust system, where flow uniformity is critical to optimum utilization, performance and durability of the catalyst.
  • the present invention is ideally suited for use with diesel engines, where the catalytic converter is interfaced to a turbocharger, but packaging restrictions enforce a substantially L-shaped exhaust manifold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An exhaust manifold comprising, sequentially, an inlet (12); a first tubular portion (14); a bent portion (16); a second tubular portion (18); and an outlet (20); characterised in that the bent portion comprises an elbow (22) connected to the first tubular portion, and an inflexion (24) adjacent the elbow and connected to the second tubular portion.

Description

    Technical Field
  • The present invention relates to an exhaust manifold for an internal combustion engine.
    • Background of the Invention
  • Exhaust manifolds for engines may include a bent portion. Such a bent portion may induce flow separation at the inner radius surface of the bent portion. The flow separation can have an effect on the efficiency of the catalytic converter (downstream of the bent portion) because of non-uniform exhaust gas flow and pressure loss.
    • Summary of the Invention
  • It is an objection of the present invention to overcome this problem.
  • An exhaust manifold in accordance with the present invention is characterised by the features specified in claim 1.
  • The present invention overcomes the problem of flow separation.
    • Brief Description of the Drawings
  • The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:-
  • Figure 1 is three side views of an exhaust manifold in accordance with the present invention; and
  • Figure 2 is an enlarged side view of the exhaust manifold of Figure 1.
    • Description of the Preferred Embodiment
  • The exhaust manifold 10 comprises, sequentially, an inlet 12; a first tubular portion 14; a bent portion 16; a second tubular portion 18; and an outlet 20. The bent portion 16 comprises an expanded portion or elbow 22 and an adjacent inflexion 24 at the outer radius surface 26 of the bent portion. The inflexion 24 is located between the elbow 22 and the second tubular portion 18. The elbow 22 has an enlarged diameter relative to the first and second tubular portions 14, 18 to define a concave inner surface which is substantially hemispherical in shape. The inflexion 24 is a line where the curvature of a portion of the inner surface changes from concave to convex. The combination of the elbow 22 and the inflexion 24 collectively enforce a reverse flow of exhaust gases passing through the manifold 10 with minimal flow separation.
  • Such an arrangement substantially prevents the common flow separation at the inner-radius surface of the bent portion 16, through optimal opposing pressure fields. The prevention of the flow separation at the bent portion 16 results in an improvement in the exhaust gas flow profile (uniform distribution and directional angle) with consequent improvement of the catalytic converter flow uniformity index and pressure loss, thereby providing improvements in emission conversion, converter aging, as well as engine power/torque performance.
  • The present invention provides an exhaust manifold which offers a solution to the problem of flow through broad acute-to-obtuse (in the range 60-120 degrees) bends, where flow separation within the bent portion may result in downstream flow mal-distribution, turbulence and pressure loss. This is particularly important where a close-coupled catalytic converter is positioned in the exhaust system, where flow uniformity is critical to optimum utilization, performance and durability of the catalyst. The present invention is ideally suited for use with diesel engines, where the catalytic converter is interfaced to a turbocharger, but packaging restrictions enforce a substantially L-shaped exhaust manifold.

Claims (4)

  1. An exhaust manifold comprising, sequentially, an inlet (12); a first tubular portion (14); a bent portion (16); a second tubular portion (18); and an outlet (20); characterised in that the bent portion comprises an expanded elbow (22) connected to the first tubular portion, and an inflexion (24) adjacent the elbow and connected to the second tubular portion.
  2. An exhaust manifold as claimed in Claim 1, wherein the elbow (22) has an enlarged diameter relative to the diameter of the first and second tubular portions (14,18).
  3. An exhaust manifold as claimed in claim 1 or Claim 2, wherein the inner surface of the elbow (16) is concave and substantially hemispherical in shape.
  4. An exhaust manifold as claimed in Claim 1, wherein the bent portion (16) is bent through an angle in the range 60 degrees to 120 degrees.
EP02075220A 2001-02-20 2002-01-18 Exhaust manifold for an engine Withdrawn EP1473504A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0104150 2001-02-20
GB0104150A GB0104150D0 (en) 2001-02-20 2001-02-20 Exhaust manifold for an engine

Publications (1)

Publication Number Publication Date
EP1473504A1 true EP1473504A1 (en) 2004-11-03

Family

ID=9909121

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02075220A Withdrawn EP1473504A1 (en) 2001-02-20 2002-01-18 Exhaust manifold for an engine

Country Status (2)

Country Link
EP (1) EP1473504A1 (en)
GB (1) GB0104150D0 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB184082A (en) * 1921-09-08 1922-08-10 Victor Kaplan Improvements in elbows for pipes
DE1096830B (en) * 1956-01-23 1961-01-05 Franz Josef Sellmeier Dipl Ing Pipe elbow for conveying lines for blown and flushed goods
EP0195528A1 (en) * 1985-03-20 1986-09-24 Kiyoshi Horii Pipe elbow
WO1987000601A1 (en) * 1985-07-12 1987-01-29 Warman International Limited Adjustable pipe bend
WO1998015769A1 (en) * 1996-10-07 1998-04-16 Fmc Corporation Low erosive wear elbow joint design
WO2000017562A1 (en) * 1998-09-21 2000-03-30 Dong Lim Industrial Co., Ltd. Anti-abrasion pipe fittings for high-speed particle-laden flow

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB184082A (en) * 1921-09-08 1922-08-10 Victor Kaplan Improvements in elbows for pipes
DE1096830B (en) * 1956-01-23 1961-01-05 Franz Josef Sellmeier Dipl Ing Pipe elbow for conveying lines for blown and flushed goods
EP0195528A1 (en) * 1985-03-20 1986-09-24 Kiyoshi Horii Pipe elbow
WO1987000601A1 (en) * 1985-07-12 1987-01-29 Warman International Limited Adjustable pipe bend
WO1998015769A1 (en) * 1996-10-07 1998-04-16 Fmc Corporation Low erosive wear elbow joint design
WO2000017562A1 (en) * 1998-09-21 2000-03-30 Dong Lim Industrial Co., Ltd. Anti-abrasion pipe fittings for high-speed particle-laden flow

Also Published As

Publication number Publication date
GB0104150D0 (en) 2001-04-11

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