Rotary Blower | Sliding Vane Blower | Wastewater Aeration Blower

Working Principle An offset rotor sits inside the cylinder, with vanes fitted into its slots. As the rotor turns, centrifugal force presses the vanes against the cylinder wall, causing the volume between vanes to change cyclically — drawing in, compressing, and discharging air. During operation, the pressure differential drives lubricating oil to the drip nozzle, which feeds oil into the cylinder to reduce friction and noise between vanes and the wall, while also sealing the vane gaps to prevent backflow. The main unit consists of an eccentric cylinder, rotor, vanes, pump covers, and main shaft. Vanes are inserted into equally spaced rotor slots, the shaft is fixed at the rotor center, and both ends connect to front and rear covers via bearings. Application Fields 1.Wastewater Treatment: Aeration and mixing for domestic sewage and industrial wastewater 2.Medical & Laboratory: Hospital sewage mixing aeration, laboratory gas supply 3.Industrial Auxiliary: Plating tank solvent mixing, industrial wastewater mixing aeration 4.Gas Supply: Vacuum paper feeding in printing, plastic welding air source, burner spraying, glass industry blowing FAQ Q1: What's the difference between a rotary blower and a Roots blower? A: Both are positive displacement blowers, but structurally different. Rotary blowers use an offset rotor with sliding vanes, where vanes press against the cylinder wall via centrifugal force. Roots blowers use two counter-rotating figure-eight rotors with small clearances to the housing. Rotary blowers are smaller and quieter, with flow typically under 5.41 m³/min. Roots blowers cover a wider flow range up to 500 m³/min for large-volume applications. Rotary blowers suit small wastewater aeration; Roots blowers handle medium-to-large water treatment and pneumatic conveying. Q2: What are the flow and pressure ranges of a rotary blower? A: Flow range is 0.31 to 5.41 m³/min, pressure range is 9.8 to 49 kPa. By flow, it's a small blower; by pressure, it's a medium-pressure unit. Specific models: HC-20S at 0.14–0.16 m³/min, HC-501S at 1.32–1.44 m³/min, HZ-501S at 1.44–1.32 m³/min, with noise ≤ 55 dB. Q3: What components make up a rotary blower? A: Main components include motor, air filter, blower main unit, air chamber, base (oil reservoir), and oil drip nozzle. The main unit is cast iron, containing metal rings (or springs), main shaft, rotor, vanes, eccentric cylinder, and pump covers. Rotor, vanes, covers, and eccentric cylinder are wear-resistant castings; the main shaft is 45# steel. The air chamber stabilizes discharge, and the drip nozzle feeds oil into the cylinder.