Quinny 65040-AB manual General Description, Compression Cycle and Air Flow

Section II - Description

•General Description

•The Compression Cycle

•Cooling System

•Lubricating Fluid System

•Moisture Separator

•Capacity Control System

•Electrical System

•Indicators

General Description

The QSD™ compressor is a two-stage, positive displacement, oil-free rotary screw unit consisting of two precision-machined rotors per stage. The male rotor of each stage are turned by a set of precision timing gears which are driven by the motor through a flexible drop-out type coupling. Both rotors (of each stage) are housed in a single cast iron cylinder with water jackets surrounding them.

All models are equipped with a positive displacement fluid pump mounted to the gearbox to circulate fluid through the bearing system and to the gear mesh. The fluid cooler, fluid pressure relief valve, and fluid filter are also mounted on the gearbox.

All components are attached to a heavy-duty steel frame. Controls and indicators are arranged on a control panel. An acoustical cabinet is included to reduce machine sound levels.

The Compression Cycle and Air Flow

The compression cycle of the two-stage QSD™ rotary compressor is a continuous process from the intake of stage one to the discharge of stage two. Each stage consists of two rotors in constant mesh, housed in a cylinder with two parallel adjoining bores. Each male rotor has lobes that mesh with flutes in the female rotor. The rotors are synchronized via AGMA12 timing gears. All parts are machined to exacting tolerances.

As the rotors of stage one rotate, air is drawn into the cylinder through the inlet port located immediately after the air cleaner connection. A volume of air is trapped as the rotor lobes pass the inlet cut off points in the cylinders. Compression occurs as the male rotor rolls into the female flute, progressively reducing the space, thereby raising the pressure.

Compression continues until the lobe and flute pass the discharge port. The compressed air is then discharged into the intercooler. The air then flows through a moisture separator/trap assembly to remove condensate from the cooling process. From there the air flows to the inlet of stage two. Air inlet pressure at the stage two inlet should be between 30 to 36 psig.

In stage two, the above compression process is repeated. Discharge air pressure from stage two will be the requested system pressure. From stage two the compressed air travels through an aftercooler and a second moisture separator/trap assembly. The compressed air passes through a minimum pressure check valve and into the compressed air distribution system.

Quincy Compressor® - QSD™ 9