SCR-G Screw compressors

High-Performance Airends

SCR-G series compressors are equipped with airends of the highest possible quality to produce completely oil-free compressed air with the lowest operating costs and for the longest possible service life. The excellent properties of the airends in SCR-G compressors are primarily based on advanced materials and technologies.

Rotor material – the first-stage rotors are made of high-quality carbon steel, and the second-stage rotors are stainless steel; the high material quality prevents corrosion and reduces premature wear of the rotor coating.

Rotor and housing material – the rotors and the inner wall of the airend housing are coated with a special MoS₂-based layer.

Double sealing – the rotor chamber is securely separated from the gearbox by labyrinth and hermetic seals made of stainless steel to completely prevent the ingress of gearbox oil.

Shaft bearings – to eliminate the risk of contact and reduce stress, the shafts are mounted in SKF radial and axial bearings and in gear wheels.

Unique Technology

Thanks to the combination of high-quality rotor materials, their precise mounting, and a molybdenum disulfide-based coating, a unique solution is created that extends operating life and significantly reduces energy costs and the frequency of expensive overhauls involving complete airend replacements.

Completely Oil-Free Air

The airends used in the SCR-G compressor series operate on the principle of two-stage compression. The intake air enters the first stage, where it is compressed to approximately 2 bar. It is then directed to the intercooler, where it is cooled and delivered to the second stage for final compression to the required discharge pressure.

Compression is provided by two pairs of rotors connected to the gearbox, which are hermetically sealed to ensure the air is produced completely oil-free. The airend design in SCR-G compressors meets the requirements for oil-free air with a Class 0 certification according to ISO 8573-1.

1st compression stage (pressure 2 bar)

2nd compression stage (pressure 7–10 bar)

Gearbox

Vector-Controlled Frequency Converters

SCR-HPM compressors are equipped with advanced INOVANCE frequency converters that maintain the required output pressure and adjust the drive speed to the immediate demand for compressed air. Thanks to this modern control system, idle running is significantly reduced, resulting in energy savings of tens of percent. Further cost reductions can be easily achieved by quickly adjusting the output pressure and control pressure range.

The vector-controlled converters used have been developed specifically for screw compressor applications and provide very high torque at frequencies as low as 0.1 Hz. Standard frequency converters either cannot operate below 5 Hz or are extremely inefficient in this range.

The new generation of INOVANCE vector converters ensures very high energy efficiency across the entire speed range.

SCR9000 electronic controller

Moderní systém pro ovládání chodu šroubových kompresorů s komfortní 7" dotykovou barevnou obrazovkou a disponuje následujícími funkcemi a vlastnostmi:

• button control
• display of all necessary parameters about machine operation
• indication of operational warnings and alarms
• alarm history for machine fault analysis
• user level via password
• practical display of electricity consumption
• weekly plan with 5 time slots for compressor start-up and shutdown
• automatic restart after power failure

Efficient Cooling System

During air compression in the dry-running airend of SCR-G compressors, the absence of oil and the extremely high rotor speeds generate a large amount of heat, reaching almost 200 °C, which must be effectively removed from the system and the entire machine. SCR-G compressors are therefore equipped with oversized coolers and an efficient ventilation system.

Information materials

Brochure for download