Arrangement of an exhaust-gas return system for an internal-comb

Details Arrangement of an exhaust-gas return system for an internal-comb Arrangement of an exhaust-gas return system for an internal-comb

1983-03-14

1985-12-03

Hart, Douglas

Power plants

Fluid motor means driven by waste heat or by exhaust energy...

With supercharging means for engine

60278, F02B 3700, F02M 2506

Patent

active

045559040

DESCRIPTION:

BRIEF SUMMARY
The invention refers to an arrangement according to the type indicated in the introductory part of the main claim.
It is known, in the case of internal-combustion engines, to connect the exhaust-gas turbosupercharger in the center of the flow at the exhaust-gas collector. This results in exhaust-gas currents in the exhaust-gas collector that go in opposite directions which, in order to avoid a disadvantageous mutual influencing in the exhaust-gas collector, are, in each case, led separately to the hot-gas inlet of the turbine of the exhaust-gas turbosupercharger.
It is also known, in the case of an exhaust-gas superturbocharged internal-combustion engine having an exhaust-gas return system, to connect an exhaust-gas return system at the exhaust-gas collector. In order to achieve a perfect exhaust-gas return, this system must be connected with each individual gas-distribution duct of the exhaust-gas collector. This requires the development of additional connecting ducts in the exhaust-gas collector that are separate from one another, which makes the exhaust-gas collector costly to manufacture.
In addition, in the case of the known exhaust-gas return systems, a relatively long connecting pipe is used, which is heavy because of additional mounting support, and which is frequently led over the cover of the control-shaft space or of the cylinder head of the internal-combustion engine to the air collector. In addition to the increased mounting costs for the connecting pipe, there is also the disadvantage that the abovementioned parts of the internal-combustion engine during maintenance are not accessible without a dismounting of the exhaust-gas return system or the connecting pipe.
The invention therefore has an objective of creating an arrangement of an exhaust-gas return system for an internal-combustion engine having an exhaust-gas turbosupercharger, that is lighter and simpler in construction.
This objective is achieved according to the invention wherein a combustion engine has an exhaust-gas turbosupercharger, the latter having a compressor casing flanged to the turbine casing such that the exhaust gas return system comprises a connecting pipe and a control valve, the assembly comprising an arrangement of the exhaust-gas return system at the exhaust-gas turbosupercharger between the hot-gas inlet of the turbine casing and the air-charge outlet of the compressor casing.
By means of the exhaust-gas return system connected at the exhaust gas turbosupercharger according to the invention, relatively long and therefore heavy exhaust-gas return pipes including additional mountings are advantageously avoided. Since there is no long exhaust-gas return pipe, access to the structural components of the internal-combustion engine is significantly improved. The arrangement also results in an improved accessibility of the whole exhaust-gas return system and therefore also facilitates maintenance when the internal-combustion engine is built in. Further, by means of the invention, an assembly unit is advantageously created consisting of the exhaust-gas turbosupercharger and the complete exhaust-gas return system. Finally, the arrangement as connected also results in a longer mixing path of the air charge and the returned exhaust gas.
An object of the invention is an exhaust-gas return system which comprises an overflow opening in the wall of the turbine casing connected with a damming chamber assigned to an integrated exhaust-gas bypass valve, in the hot-gas inlet duct of the turbine of the exhaust-gas turbosupercharger. Another object of the invention is an exhaust-gas return system which, by means of an aperture in the wall of the compressor casing, is connected with an annular chamber disposed in the compressor outlet duct, a transverse inflow of the returned exhaust gas with a damming effect of the air charge in the outlet duct of the compressor being thereby avoided. Another object of the invention is an exhaust-gas return system wherein a section of a connecting pipe is disposed at a connecting piece of a compressor c

REFERENCES:
patent: 4250711 (1981-02-01), Zehnder
patent: 4355505 (1982-10-01), Grohn

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