Two-stage fan, pumps or the like, in particular for medical purposes

摘要

The invention relates to a two-stage apparatus for delivering gases, vapours or liquids by means of impellers driven in the two stages at different rates, in particular for medical purposes, and has the aim of providing an apparatus which is of simple construction, in its uncomplicated guidance of the delivery medium from one stage to the next and, moreover, makes it possible, with a small amount of elements, to achieve optimum adaptation to widely varying operating conditions. For this purpose, the invention proposes to arrange, between the drive motor and the impellers through which the medium is to be delivered, a gear mechanism with a drive shaft and two driven shafts, of which one is designed as a hollow shaft in which the other driven shaft is guided coaxially (Figure). <IMAGE>