Improvements relating to gas and/or vapour compressors.

摘要

A gas and/or vapour compressor comprises a casing containing liquid and having located within it a shaft driven radial impeller for pressurising the liquid before it is fed to a further rotatable structure where by rotation thereof the high pressure liquid compresses a gas or vapour within the compressor casing and expels it from the casing through an outlet port therein. The high pressure liquid inlet end of the rotatable structure is partially shrouded by shroud means to restrict the input of high pressure liquid to part of said rotatable structure. The shroud means has an opening therein which allows the high pressure liquid entering the rotatable structure to be depressurised and returned to the inlet end of the radial impeller after compressing said gas and/or vapour. By so doing further gas and/or vapour for compression will be drawn into said compressor casing.