Liquid injected compressor installation, includes lubricant supplying cool liquid to rotor bearings in compressor casing

摘要

A lubricant line (28) has an outlet end connected to the cooler outlet (20) or to a second injection pipe portion (16B) connecting the cooler outlet to the compressor (2). The other end of the lubricant line communicates with the compressor casing (3) in the region of the rotor bearings (7), so that these bearings can be lubricated. The compressor casing encloses a compressor space containing at least one rotor. The compressor has an air inlet and a compressed air outlet connected to a liquid separator, which in turn is connected to the compressor via an injection pipe. A first portion of the injection pipe connects the liquid separator to a cooler inlet. A bridge (22) extends above the cooler (20) between the first and second portions of the injection pipe. The bridge includes a control mechanism for the flow of liquid through it.