Process, oil and cooling flows – a step by step guide

• Air intake with noise attenuating baffle system.

• Air is filtered prior to entering the screwblower element.

• Internal compression in the oil-free screwblower element.

• At start-up, the blow-off valve is ‘open’ for smooth unit start-up. That valve closes itself, pushed by the increased air pressure.

• As soon as the blow-off valve is closed, air pressure increases further, resulting in enough force to push the check-valve open.

• Discharge silencer reduces the pressure pulsation levels to the minimum.

• Air delivery to the system.

• Oil pump, mounted on screwblower shaft hence directly driven.

• Oil suction from carter, integrated in the gearbox.

• All oil is pumped to oil cooler; all oil is cooled.

• Cool oil flows through Permanent Magnet motor cooling jacket.

• Bypass valve decides exact oil flow that is required for bearing- and gear cooling and lubrication.

• That oil first is fine-filtered.

• Filtered cool oil is distributed to individually tuned oil nozzles per bearing and/or gear in screwblower element, gearbox and Permanent Magnet motor.

• Internal drains recover all oil in the carter (in the gearbox).

• One cooling fan pulls the hot air out of the canopy.

• Fresh air is taken from the unit back side.

• That air first passes a noise attenuating baffle system.

• The cooling fan forces the canopy air through the oil cooler, taking away the heat of the oil. The hot air then leaves the canopy through the roof-top grating.

• The VSD cubicle is cooled with fresh air taken-in through filters in the front door.

• Cubicle fans push the hot air out of the cubicle, the hot air can leave the canopy through the same roof-top grating.