IMPROVEMENTS IN AND RELATING TO SINGLE SCREW COMPRESSORS

摘要

A single screw compressor having at least two pumping chambers (10A, 10B) of variable volume formed in the flutes of a screw, each of which receives fluid to be compressed from a primary inlet (14:34) when the respective pumping chamber has a first volume at least close to its maximum volume and each of which discharges compressed fluid from an outlet (13a, 13b) when the respective pumping chamber has a second volume which is less than said first volume, one of said pumping chambers (10B) having a secondary inlet (12b, 36) open to the said one chamber (10B) when it has a third volume intermediate the first and second volumes after said one chamber (10B) is closed off from its primary inlet but before the said one chamber (10B) opens to its outlet, is characterised in that means (38a, 38b: 40) is provided on the compressor to connect the outlet of the other pumping chamber (10A) to the secondary inlet (12b, 36) of said one pumping chamber (10B).