Diaphragm pump, particularly with three working chambers.

摘要

A pump comprising a housing (17) and a flexible diaphragm (33) mounted in the housing (17). A first region (61) of the diaphragm (33) partially defines a first pumping chamber (81), and the pumping chamber (81) has an inlet (83) and an outlet (85). A wobble plate drive is coupled to the first region (61) of the diaphragm (33) to provide a pumping action in the pumping chamber (81). The wobble plate drive has a nutating axis (53), and the first region (61) of the diaphragm (33) lies radially outwardly of the nutating axis (531. The first region 161) of the diaphragm (33) has a generally annular ramp section (71) which flexes when driven by the wobble plate drive to provide the pumping action, and the ramp section (71) is wider radially at a location remote from the nutatmg axis (53) than at a location nearer the nutating axis (53). The pump also has a single outlet valve (93) arranged to serve multiple pumping chambers.