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You are on : Home > Products > DSP Series

DSP Series

Oil Free Screw
Clean Compressed Air, Energy-Saving, User-Friendly
HITACHI High Standard Model for Both Environment and Productivity

"Further Energy-Saving and User-Friendly" is the concept for HITACHI oil free screw compressor, NEW DSP series. Built-in inverter model achieved further energy saving by constant pressure control,and customer can choose from wide lineup.
  • Environmentally friendly, clean compressed air, without condesation process.
  • Easy operation by large LCD monitoring display.
  • Advanced functions and performance by scheduled operation and efficient maintenance.
  • Contribution to cost saving and productivity.

High Performance Air End

Stainless Steel Fine Rotor
Particular stainless steel,superior in corrosion resistance and durability, is applied for rotor, with highly accurate grinding. Furthermore, to reduce internal leakage, mirror finished surface enables to keep appropriate clearance, including thermal expansion during operation.
High Performance Rotor Profile
The rotor is enlarged significantly by thermal expansion. Heat expansion of the rotor occurs since it exposes 300℃ discharge air to the single-stage model. ( 200℃ even for the two-stage model) HITACHI original 3D correction technology is used to keep the most appropriate clearance.
Shaft Seal
Combination of air seal and visco seal prevents oil from entering compression room. Especially, HITACHI original visco seal, only designed for oil free screw compressor, pushes back oil strongly by its internal spiral groove.
PATENT-HOLDING HI-Precooler System
Hi-precooler system cools down high temperature discharge air to be at 180℃ and below before entering after cooler. This enables aftercooler to be less than the upper temperature limit. HITACHI applied this system to the large size, air-cooled model and improved reliability.