OIL-SURFACE CONTROLLER OF PLURALITY OF OIL SEPARATORS FOR OIL-COOLING TYPE SCREW COMPRESSOR IN PARALLEL OPERATION

摘要

PURPOSE:To permit the free arrangement of oil separators by allowing the discharge side of each oil separator to communicate through the first valve and allowing the downstream side to communicate to the space after the closure of a compressor through the second valve and opening and closing the valves according to the signal of an oil-surface detector. CONSTITUTION:When the oil-surface lower-limit position detector 14a of an oil separator 4a operates, only the second solenoid valve 18a and the first solenoid valves 15b and 15c are opened, and oil flows into the oil separator 4a from the oil separators 4b and 4c through a compressor 1a by a sufficient pressure difference, and the oil surface rises. When the oil-surface reaches a prescribed height, an oil-surface upper-limit position detector 13a operates to close the first and the second solenoid valves 15b, 15c, and 18a, and the oil supply from outside is suspended, and the oil surface in the oil separator is kept at a prescribed position.