ABB HT563830 Operation Manual page 9

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Operation Manual / TPL65-A32 / -A33 / -A36 + TPL69-A32 / -A33
Preliminary remarks
Layout and function
Working principle
The turbocharger is a turbo-machine and consists of the following main
components:
 Turbine
 Compressor
These are both mounted on a common shaft.
The exhaust gases from the diesel engine flow through the gas inlet
casing (7) and nozzle ring (8) to the turbine wheel.
The turbine wheel (9) uses the energy contained in the exhaust gas to
drive the compressor wheel (12), whereby the compressor draws in fresh
air, and the compressed air is forced into the cylinders.
The exhaust gases escape to free air through the exhaust manifold which
is connected to the gas outlet casing (6).
The air which is necessary for the operation of the diesel engine and
which is compressed in the turbocharger is drawn through the suction
branch or the filter silencer (1) into the compressor wheel (12). It then
passes through the diffusor (11) and leaves the turbocharger through the
compressor casing (13).
The rotor runs in two radial plain bearings (2/5). One plain bearing is
situated in the bearing bush (4) and one plain bearing is situated in the
axial thrust bearing (3) at the compressor side.
The plain bearings are connected to a central lubricating oil channel which
is fed with oil from the engine lubrication circuit. The oil outlet is always at
the lowest point of the bearing casing (10).
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