PM Variable Frequency Screw Air Compressor
Durable & Stable Airend
Designed with large rotors, oversized bearings and low rotational speed to cut noise & vibration, extending service life and boosting stability of the airend.
High-precision rotors deliver superior operational stability.
Adopts innovative 5:6 asymmetric rotor profile, fully measured via high-precision 3-coordinate measuring machines, increasing air output by 5%–10%.
Equipped with imported brand bearings.
Special Motor for Air Compressors
PM Variable Frequency Screw Air Compressor motor fitted with imported bearings, IP54 protection class and F-class insulation, suitable for harsh environments with heavy dust and high temperatures.
IE3 high-efficiency motor reduces power consumption to lower operational costs.
Designed with a service factor of 1.2, featuring high starting torque to meet diverse working condition demands.
Coupling
Torsionally elastic coupling with fail-safe protection, effectively damping vibration and impact generated during operation.
Elastic element only bears compressive force to withstand larger loads; drum-shaped teeth on the elastic body avoid stress concentration.
Stable & Reliable Electric Control System
Integrated monitoring functions for voltage, three-phase unbalance, overpressure, overtemperature, overload and limit violation, with corresponding alarms to provide real-time unit protection. The system automatically monitors operating status and executes load/unload, sleep and restart cycles without dedicated on-site supervision.
IoT-enabled system allows remote real-time equipment status viewing via mobile phones.
Intelligent control panel supports Chinese/English bilingual setup and multi-unit parallel connection.
Premium electrical components adopted; contactors sourced from international brands.
Emergency stop function: a push-type emergency stop button is installed in a prominent position for immediate shutdown in critical situations.
Inner Rotor Cooling Fan
IP44 cooling fan with F-class insulation.
Compared with outer rotor fans, inner rotor fans generate higher wind pressure and larger air volume for enhanced cooling performance.
Higher wind pressure prevents clogging of coolers and filter screens.
Three Core Filters
Air Filter: Filtration area reaches 150% of standard requirement, delivering low intake pressure drop and high energy efficiency.
Oil Filter: Oversized filter element made of imported glass fiber media; rated handling capacity ≥1.3 times the circulating oil volume, featuring high filtration precision and outstanding durability.
Oil Separator: Imported glass fiber separator core achieves superior oil removal efficiency with low pressure drop.
Special Valves
Intake Valve: Optimized via low-flow velocity testing with minimal pressure drop to cut energy consumption.
Minimum Pressure Check Valve: Low pressure drop, fast re-seating, and prevents air backflow.
Thermostatic Valve (Partial Models): Units fitted with mixed-flow thermostatic valves enable easy startup in low-temperature environments. It stabilizes unit performance by regulating oil supply temperature of the airend.

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