Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Patent
1988-07-06
1990-02-27
Koczo, Michael
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
F02B 3700
Patent
active
049034898
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a supercharged multi-cylinder reciprocating piston-internal combustion engine with several exhaust gas turbochargers operating in parallel with at least one of the turbochargers being selectively interconnected. An optimum charging air supply matched to the operating condition of the reciprocating piston-internal combustion engine is attained with such an arrangement.
A reciprocating piston-internal combustion engine of the aforementioned type is known from the DE-PS 28 38 952 (corresponding to U.S. Pat. No. 4,299,090) in which one exhaust gas turbocharger is coordinated to each cylinder row. So-called blocking air seals for limiting lubricating oil losses are arranged at the rotors of the exhaust gas turbochargers, which blocking air seals are supplied with compressed air from the charging air line of the reciprocating piston-internal combustion engine. When turning-off one cylinder row, the associated exhaust gas turbocharger is stopped by closing-off the exhaust gas supply to the turbine. The air supply of the shut-down cylinders operated as compressor takes place either through the idle charging air compressor or by way of additional suction valves at the cylinders directly out of the atmosphere. During this operating condition, no positive charging air pressure is present in the charging air compressor of the shut-down exhaust gas turbocharger and in the charging air line of the shut-down cylinders. The excess pressure necessary for the functioning ability of the blocking air seals is therewith lacking. The lubricating oil supply is not interrupted during the temporary shut-down of the exhaust gas turbocharger. With lacking blocking air pressure, lubricating oil escapes through the blocking air seals. The leakage oil collects as a pool in the spiral housing of the exhaust gas turbine and charging air compressor of the shut-down exhaust gas turbocharger. When connecting-in the exhaust gas turbocharger, the leakage oil pool is pulled out of the spiral housing of the charging air compressor by the charging air stream into the charging air manifold which leads to operation-endangering overheating in the associated cylinders. Leakage oil escaping at the exhaust gas turbine leads to coking and to uncontrollable exhaust gas fire with damages endangering the operation at the rotor and the exhaust gas installation.
It is therefore an object of the invention to create a reciprocating piston-internal combustion engine in which, during operating periods with small partial load, a pressure lying above the atmospheric pressure remains preserved in the charging air manifold also after shutting-down of the exhaust gas turbochargers and shutting down of some cylinders.
This object is achieved according to the invention by providing an arrangement wherein atmospheric air is supplied to the disabled group of cylinders so as to provide atmospheric air pressure in the active supercharged air line from which air for the air seal is obtained.
The advantages attained with the invention reside in particular in that by decoupling of the air supply for the shut-down cylinders, the air mass flow rate of the non-disconnectable exhaust gas turbocharger produces an operation in the optimum operating range and increased pressure condition, in that during idling and partial load, a charging air pressure lying above the atmospheric air pressure is achieved in the charging air line system, in that during the operation periods with shut-down cylinders, also the charging air compressor of the shut-down exhaust gas turbocharger is acted upon with the charging air pressure prevailing in the charging air line system as a result of the closure device arranged on the suction side, in that the blocking air seals at the rotors of both exhaust gas turbochargers are supplied adequately with compressed air by the increased charging air pressure, which prevents lubricating oil from escaping into the spiral housing and in that with the improved charging air supply of the non-shut-down cylinders, the operation of
REFERENCES:
patent: 4422296 (1983-12-01), Dinger et al.
Koczo Michael
MTU Motoren - und Turbinen-Union Friedrichshafen GmbH
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