Project Description

Tri Lobe Blowers

Tri Lobe Blowers

  • Tri Lobe Blowers with pressure to 1,000 mbar (g), vacuum to 500 mbar (a) & air flow to 25,000 m³/h
  • Innovative Positive Displacement Rotary Lobe Blowers for any application
  • Superior efficiency, low noise emissions, small footprint, minimum maintenance and long service life
Request for Quotation


Robuschi design and manufacture high performance rotary tri lobe blowers that meet any working condition with superior efficiency, low noise emission, small footprint, minimum maintenance, competitive operating costs and long service life. The Tri Lobe Rotary Positive Displacement Blower, RBS, is an innovative tri lobe rotary blower equipped with a special low pulse system to reduce pressure pulsations.

The cast iron, dynamically balanced tri lobe blower is a positive displacement unit with a pumping capacity determined by size, operating speed and pressure conditions. It operates with two tri-lobe impellers mounted on parallel shafts, rotating in opposite directions within a casing closed at the ends by side plates. As the impellers rotate, air is drawn into one side of the casing and forced out of the opposite side against the existing pressures. The discharge pressure depends upon the system resistance or back pressure. A pair of accurately machined alloy steel, hardened and ground timing gears maintain clearances between the impellers during rotation, resulting in 100% oil free air.

Lobe compressor blowers are constant volume machines and as such, deliver a fixed discharge against the system back pressure. It is important to have adequate size piping and large radius bends to maintain high working efficiency and low power consumption. Recirculating air from the discharge to suction may result in over heating. Using throttle valves in the intake or discharge piping to increase capacity, increases the power load on the motor which may seriously damage the compressor.

Robuschi Pressure Vacuum Model bearings have a lifespan of 20,000 hours, even under the most severe operating conditions. The rotors ensure reduced clearances, which increases volumetric efficiency. The gas seal on the rotor shafts is an exemplary feature. It ensures the flow of oil-free gas by a labyrinth seal coupled to oil splash discs.

There are variations in the range of tri lobe models. The cooled version is equipped with two cooling coils that maintain the oil temperature below 100°C in all working conditions. It is an ideal blower system for situations when the gas discharge temperature exceeds 140°C.

It comes with two types of coating:

  • Niploy (Electroless nickel plating): it guarantees high resistance to corrosion and wear.
  • Chemcoat (fluoropolymer lining): it guarantees corrosion resistance for contact with damp substances, nonstick and sliding properties.

The RBS INOX is a stainless steel version of tri lobe blowers, constructed from stainless steel (AISI 316 or DUPLEX), to provide excellent top performance corrosion resistance in a variety of heavy-duty applications such as wastewater treatment, ozone and evaporation processes.

The series of pumps come in a range of models capable of working at top level performance in just about any environment and able to meet just about any service test. When it comes to providing the right tri lobe blower to provide the working pressure that pumps oil free air at the required rates, our range of blowers are hard to beat. Your blower unit can also be customised to provide the exact requirements needed.