We offer both types of Robuschi positive displacement blowers. The rotary lobe (capacity up to 25,000 m³/h) and the screw (capacity up to 10.100 m³/h) meet the various needs of customers and their wide range of applications.


Robuschi rotary lobe blowers

The range of Robuschi Rotary Lobe Blowers has been reinvented, focusing on delivering exacting customer requirements.

We launch the new Robox blower unit concept, a cutting-edge solution that can accommodate rotary lobe and screw technologies to provide users with greater choice than ever before in helping meet their industrial air and gas needs.

With the new Robox, the difference between lobe and screw technology is reduced to just a few components. This makes it simpler than ever to change from one technology to another and embraces the ongoing shift in mindset from capital investment to total cost of ownership.

Robuschi rotary lobe blowers are available at varying pressures above atmospheric up to 1,000 mbar (g) and for vacuum duties up to 100 mbar (a) along with maximum air flow of 25,000 m³/h.

Pressure - Vacuum


Three Lobe Rotary Blowers. Pressure up to 1,000 mbar (g) – Vacuum up to 500 mbar (a) – Capacity up to 25,000 m³/h.


Rotary Lobe Blowers for MVR. Pressure up to 1,000 mbar(g) – Vacuum up to 500 mbar(a) – Capacity up to 13,859 m³/h.


Blower Unit (new sizes 3.5 & 4). Pressure up to 1,000 mbar(g). Vacuum up to 500 mbar(a). Capacity up to 10,500 m³h.


Rotary Lobe Blower Units for AQUA culture Application. Pressure up to 1,000 mbar (g) – Capacity up to 700 m³/h.


Table Top Blower Units. Pressure up to 1,000 mbar (g) – Vacuum up to 500 mbar (a) – Capacity up to 25,000 m³/h.


Rotary Lobe Blower Units for Biogas and Gas Applications. Pressure up to 1,000 mbar (g) – Vacuum up to 500 mbar (a) – Capacity up to 2,850 m³/h.


Rotary Lobe Blower Skid for Biogas Applications. Pressure up to 400 mbar (g) – Vacuum up to 500 mbar (a) – Capacity up to 2,850 m³/h.


Vacuum Blowers. Vacuum up to 100 mbar (a) – Capacity up to 10,500 m³/h.


Packaged version of RB-DV complete with noise enclosure.


Rotary Lobe Blower Package for Ehnanced Efficiency. Pressure up to 1,000 mbar(g) – Capacity up to 700 m³/h.



Vacuum Units Vacuum up to 100 mbar (a) – Capacity up to 10,500 m³/h.


High Vacuum Blowers. Vacuum up to 0.001 mbar (a) – Capacity up to 9,400 m³/h.

Because of the wide range of models, sizes, options, and configurations available from Robuschi, there is a rotary lobe blower that can provide solutions for most industrial applications. These blowers can operate in pressure and vacuum, and can be equipped as a complete package, with customisation according to specific industrial technical requirements and providing optimal performance and maximum uptime with consistent quality and reliability in every application.

There is a rotary lobe vacuum product for just about any industrial requirement.

Functionality of the “Roots” Positive Displacement Blowers

The air flow depends on the position and direction of the rotors. The typical installation provides a constant air flow, and that the rotational direction is dependent on the “Roots” blower design. As a side note, the Roots blower design is enduring and durable. The rotary positive air blower was designed in the 1850s and patented in 1860 by brothers Francis and Philander Roots and the Roots name has remained as the description of the design.

The basic principle is as follows: the process starts with air flowing from the inlet port into the element chamber. The timed rotation of the rotors against the wall of the chamber creates so-called “air flow direction”. There is still atmospheric pressure in these chambers.

As soon as the first lobe passes the opening to the pressure side, the system pressure is adjusted. This is called isochoric compression. The rotors seal each other off to the inside, which prevents a change of pressure.

Robuschi screw blowers

How the Robuschi Screw Blower Airend Works?
The Robuschi oil-free screw blower airend is a positive displacement machine with rotary motion, also known as “helical screw” compressor.

It delivers constant flow (volume) and variable pressure, which means that at a given speed (rpm), the compressor airend always supply the same amount of air, independently by the pressure variation.

The screw blower airend consists of a pair of helical profile rotors (one male rotor with 3 convex lobes and one female rotor with 5 concave lobes or “flutes”), contained in a casing.

The rotors turn in opposite direction maintaining precise alignment by means of timing; meshing they form a series of working chambers between the rotors and the casing wall.

The gas is sucked from the intake side (suction), trapped between the rotors and the casing (radially) and the cover (axially), transported to the compression side (discharge) where the working chamber shrinks, and compressed.     The internal compression leads to supply a steady, non-pulsating air flow, minimizing vibration and maintenance and maximizing lifetime.

Due to the fact that there is no oil for sealing (oil-free screw), the rotors have very precise and small tolerances to maintain a very small air-gap between the two in order to guarantee optimal performance without touching each other.

The Robuschi Screw Blower Range

The Robuschi screw blower range combines innovative components, cutting-edge design and outstanding efficiency. The result is a very comprehensive choice of screw blowers that includes Robox Screw and Robox Energy series.

The new Robox Screw blower fits the state-of-the-art CDL airend. This patented screw blower is equipped with 3×5 profile rotors designed with wide diameter shafts. This reduces the deformation caused by internal and external loads, and ensures the blower can work efficiently in even the harshest conditions.

Thanks to its exclusive design, Robox Screw ensures low noise with a new canopy concept and improved panels. It has a small footprint that uses up to 11% less space while delivering 20% more air flow. It also provides energy efficiency, easy installation and simple accessibility for service and maintenance.

Robox Energy meets the unique characteristics of the RSW “core” (patent) that uses an innovative motor with permanent magnets and an integrated electrical panel. This offers maximum efficiency, compactness, simple maintenance and flexibility for wastewater treatment plant requirements.


Screw Blower Unit. Pressure up to 1,000 mbar(g) – Capacity up to 10,100 m³h.


Screw Blower Unit with Permanent Magnet Motor. Pressure up to 1,000 mbar(g) – Capacity up to 4,200 m³/h.

Products range