The compressor is equipped with two stage air end ("of dry-type") without oil injection into the
compression chamber with the bearings and gearing and the coat of the high pressure part are
lubricated and cooled with oil.
POWER AND CONTROL
The compressor (screw air-end) is driven by an electric motor through a flexible coupling . Control
of the entire electrical system is placed in a electrical box.
AIR CIRCULATION
The air is sucked through the air filter (1) and the suction controller (2) to the first stage (3). The
compressor suction regulator is equipped with a second stage discharge (4) terminated by a noise
damper (5). After compression to the overpressure of 0,35 MPa the air is forced from the 1st
stage to the intercooler (air-water exchanger) (6). After cooling in the cooler, the air flows through
the condensate separator (7) and is sucked to the second stage (8). I-stage compression and
internal system are protected against pressure rise above the permissible value by a safety valve
(9). After compression, it reaches an overpressure of up to 1,0 MPa and is forced into the end
cooler (air-water exchanger) (10), and then through the check valve (11) to the compressor outlet.
OIL CIRCUM
The oil is sucked by the pump (13) from the compressor reservoir (13) and is forced to the
overflow valve (16) in which the oil overpressure is limited to 0.25-0.30 MPa and then flows to
the oil filter assembly (18). The oil filter set is fitted with a thermostat (17) which, depending on
the oil temperature, directs the oil directly through the oil filter (18) to the manifold (19) or at
temperature exceeding 55 ° C to the oil cooler (20) and then through oil filter (18) to the
manifold (19). The pressure in the manifold is limited to 0.14-0.16 MPa with an overflow valve
(15). The outlets from the oil filter assembly to the oil cooler and inlet from the radiator to the
unit are equipped with electromagnetic shut off valves (21) and (30) which are closed (normally
closed NZ) when in the de-energized condition. These valves are designed to prevent the flow of
oil from the radiator to the installation and further to the oil tank, which avoids the need to
always fill the radiator with oil after the compressor's standstill. In addition, the oil level display in
the sight glass (22) is always reliable (without shut off valves the sight glass would be completely
filled with oil).
From the manifold the oil is distributed to both compression stages ie bearings, seals and coats of
I-stage and II- stage. After passing through the compressor, the oil flows to its reservoir (14).
After the filter, the oil is also fed to the three-way valve (23) and, depending on the compressor
load, flows to the hydraulic cylinder (24) controlling the shutter (25) in the suction controller (3).
In the second position, the oil from the valve (23) flows to the compressor reservoir (14). Also the
oil from the hydraulic cylinder is directed to the compressor tank.
