Patent ID: 7547203
Filing Date: 2009-06-16
Classification: F04C,Y10S

Abstract:
1. Screw compressor for compressing refrigerant in a refrigerant circuit, comprising a compressor housing, a screw rotor receiving means and an inlet channel as well as an outlet channel for the refrigerant to be compressed being provided in said housing, at least one screw rotor arranged in the screw rotor receiving means, a drive for the at least one screw rotor and a lubricant supply conveying lubricant from a lubricant reservoir acted upon by pressure via a line system to the at least one screw rotor during operation, said lubricant supply comprising a first differential pressure detection element detecting a difference in pressure between the pressure in the outlet channel and a reference pressure influenced by a pressure in the refrigerant circuit, the first differential compressor detection element comprising an actuating device for the valve in the lubricant supply as well as a sensor detecting actuation positions thereof, and a compressor control, said control switching off the drive for the at least one screw rotor when the difference in pressure following a starting phase of the drive is not in an operating pressure range determined by compression of the refrigerant as determined by the first differential compressor detection element.