The mechanism is intended for moving a medium in gas, vapour or liquid form by means of a, pref. liquid, fluid which is propelled by a centrifugal pump with axial inlet (3), bladed (6) impeller (5,8) and radial outlet (4). This outlet forms the annular drive nozzle for an ejector having an annular inlet (9) for the medium, an annular mixing chamber (16) and a diffusor (17,17'). The flow passage consisting of nozzle (4), mixing chamber (16) and diffusor (17,17') has at least one of its two axial boundaries formed by an annular disc (2,15) which is fixed to the housing (1,2) or rotates with the impeller.
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