Oil Free Screw Air Compressor

HITACHI

SDS U SERIES TWO-STAGE (105-440 kW)

Hitachi Super Dry Screw compressors cater to different industries where oil-free air is required in food and beverage, pharmaceutical, automotive and electronics industries. These models are higher capacity models which cater to factories with higher air requirements.


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    • Air Filter, two types of unwoven chemical fiber, combined with a three-dimensional construction, are used for air filter. Dust can be captured three-dimensionally with the multilayer construction. The filter is reusable when cleaned.
    • Discharge Silencer, providing lower noise level. This silencer reduces irritating high-frequency noises by reducing the pressure pulsations of the air compressor.
    • Check Valve supporting longer product life. This time-proven lift-type check valve is used to prevent the backflow of air. The valve construction with a reduced number of moving and sliding parts assures longer life and higher reliability.
    • Highly durable Capacity Regulator Valve. A simple construction that drives the intake valve by the hydraulic piston is adopted. Its excellent durability contributes to energy-saving as pressure setting range can be reduced during a load state.
    • Main Motor with improved reliability. A totally enclosed flange-type motor is used for the main motor to improve reliability. Maintenance operation is not necessary for main shaft, which is directly connected to gears without using a coupling or a step-up gear bearing.
    • Noise Control Cover in Robust Construction preventing noise leakage. Advanced measures are incorporated to prevent various kinds of noise such as the panel-transmitting noise and the noise leaking from the (suction) inlet and the air vent.
    • Environment-friendly Oil Capturing System. OMCS (Oil Mist Capturing System) is commonly equipped in this series. It collects smoke from the gear casing.
    • New Air-End, the essence of our original technologies behind abundant track record, is concentrated into profiling Air Block. The 3-D fluid analysis that makes full use of an advanced CFD (Computational Fluid Dynamics) technology simulates to assist in optimising shapes of air flow path, innlet, outlet, and rotor.
    • 3-D Screw Rotor Compensating Thermal Deformation. A 3-D screw rotor (patented) that compensates for the thermal deformation distribution from the difference in air temperature between the inlet and outlet sides. The rotor, for which the high precision machining technology is applied, has a surface coated with a new resin material (patented), which gives the rotor a high level of durability.
    • Long-Life Bearings. In addition to high quality materials and high precision technology used for the bearings, advanced analysis technologies and lubricating theory are applied to select the type of lubricant, cleanliness, spray nozzle shape and other items affecting the bearings. Every effort is made to give the bearings a longer life.
    • Highly Reliable Shaft Seal. Through the use of a wear-resistant floating seal, air leakage can be sealed for a long time. High quality thread seals are also employed for bearings, providing double prevention against oil mist entering the compression chamber.
    • New and Highly Functional Control Panel featuring quick and simple operations. An easy-to-watch, highly maneuverable and color LCD touch panel is adopted. Quick navigation function works to instantly reach your desired screen and facilitates your operation. It is capable of setting various parameters and displaying various histories as well as trend graph. HELP function also has been upgraded. Multi-control, data communication and remote monitoring can be selected as optional functions.
    • End Pressure Control with APC (Active Power Control). Air pressure discharged from a compressor loses as air decreases through various equipment. It automatically calculates and controls its pressure setting value to maintain constant end pressure to a user, reducing redundant high pressure operation and contributing to energy saving.
    • Precision Pressure Control with PSC (Power Save Control). It can automatically control pressure range while ensuring a specified load-unload cycle time, which leads to reducing abundant air pressure and contributing to energy saving.
    • Automatic Start/Stop with ASS (Auto Start & Stop). A compressor automatically stops as line pressure rises up to a certain preset pressure and also unload state continues over a specified time period. It automatically starts up when the line pressure drops to the preset pressure level.