TWO-STAGE SCREW COMPRESSION TYPE REFRIGERATING DEVICE

摘要

PURPOSE: A two-stage screw compression type refrigerating apparatus is provided to increase the drawing pressure of a first stage and to supply oil to a bearing in discharging side in case the discharging pressure of a second stage is lowered. CONSTITUTION: A two-stage screw compression type refrigerating apparatus comprises first and second step screw compression parts(8, 9) connected in series for the compression of coolant and an oil supply passage and oil discharge passage. The oil supply passage supplies oil to the bearing in the discharging part of the second step screw compression part. The oil discharge passage discharges oil to the compression space of the first step screw compression part from the bearing.