Premixing compressor for supplying air and gas mixture into combustion chamber of gas burner to heat water in e.g. commercial application, has electric motor whose output shaft is coupled to impeller that is fastened to output shaft

摘要

The compressor (10) has a housing (20) with an inlet (22) and an outlet (24) that communicates with the inlet. An impeller is installed in the housing, where the impeller is manufactured from metal e.g. aluminum. An electric motor has an output shaft that is coupled to the impeller for driving the impeller. The impeller is detachably fastened to an output shaft, where a distal end of the output shaft extends through a fastening hole. A bumper (72) is arranged between a mounting plate (70) and the cover of the housing.