ABB HT842831 Operation Manual page 7

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Preliminary remarks
Layout and function
Mode of operation
The turbocharger is a turbomachine consisting of the following main com-
ponents:
 Turbine
 Compressor
These are mounted on a common shaft.
Exhaust gases from the diesel or gas engine flow through the turbine cas-
ing (10) and the nozzle ring (9) to impinge on the turbine (7).
The turbine (7) uses the energy contained in the exhaust gas to drive the
compressor wheel (13). The compressor draws in fresh air, compresses it
and then forces it into the engine's cylinders.
The exhaust gases escape into the ambient air through the exhaust gas
pipe, which is connected to the gas outlet flange (8).
The air, which is necessary for operation of the diesel or gas engine and
is compressed in the turbocharger, is drawn into the compressor wheel
(13) through the suction branch or filter silencer (1). It then passes
through the diffuser (3) and leaves the turbocharger through the outlet on
the compressor casing (2).
The rotor runs in two radial plain bearings (6), which are located in the
bearing flanges (11/12) between the compressor and the turbine. The axi-
al thrust bearing (5) is located between the two radial plain bearings.
The bearings are connected to a central lubricating oil duct which is sup-
plied by the engine's lubricating oil circuit. The oil outlet is always at the
lowest point of the bearing casing (4).
Operation Manual / TPS48-D/E.. - TPS61-D/E..
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