SKF CLU5, Руководство пользователя

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Page 84
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4. Description
4.1 System description
Reliable and durable systems are required for
cylinder lubrication of large 2-stroke diesel
motors used to power ships and generators.
The CLU5 pulse lubrication system is based
on an oil supply unit with integrated ilter unit
and up to eight modular timed lubricators
with external monitoring electronics. These
are connected to downstream injector nozzles
that lubricate cylinder's wall or, depending on
the actuation time, the piston ring package or
piston skirt.
A central main line extending from the oil
supply unit supplies all timed lubricators with
lubricant simultaneously.
A pressure relief valve (adjusted on 50 bar
according to the engine manufacturer) at the
end of the main line is used to convey excess
lubricating oil into the tank return line. The
main line is constantly pre-tensioned and acts
as an external pressure accumulators and
provides hydraulic drive for the timed lubrica-
tors.
If a changeover signal is issued to the
4/2 directional solenoid valve (to one of the
4. Description
timed lubricators) through the monitoring
electronics, the solenoid valve changes over,
which also causes the central piston in the
timed lubricator to change over. The central
piston moves against the four static delivery
pistons. A predeined quantity of lubricant then
passes through control grooves on the control
piston to reach all outlets of the feeding timed
lubricator.
From there, over the lubricating oil lines, it is
metered dynamically and under high pressure
to the injector nozzles assigned to the pump.
At the same time as the changeover opera-
tion, the opposite side of the central piston is
illed with lubricating oil. When the 4/2 direc-
tional solenoid valve switches again, causing
the central piston to change over, a predeined
quantity of lubricant is again metered to the
injector nozzles assigned to the pump.
The central piston is then back in its initial
position. The complete changeover procedure
for the delivery piston thus consistent of two
consecutive delivery strokes.
The injector nozzles have the task of lubri-
cating the cylinder wall at precisely timed
intervals. The lubricating procedure can be
performed earlier or later, i.e. at or above the
piston, depending on the time when electronic
actuation is performed.
The piston then transports the oil into the
upper portion of the cylinder so that optimum
lubrication and corrosion protection can be
achieved.
When using the timed lubricator PDYS, four
injector nozzles per cylinder are supplied with
lubricating oil simultaneously.
Depending on the load and operating state,
a lubrication pulse can be triggered on every
piston stroke and/or crankshaft revolution.
The monitoring electronics corrects minor
differences in response time if necessary, so
that the injection of the lubricant is initiated
accurately to an angular degree.
Signiicant reductions in lubricant consumption
can be achieved by optimizing the timing.