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(11) | EP 1 479 919 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Convertible transfer pump |
(57) Rotary pump for liquids comprising a pump body (2) with a rotary portion that may
include either a single or several stages to the purpose of attaining a head of at
least 3 kg/cm2. When air at a lower pressure than the pressure of the ambient air is to be blown
into the liquids, a convergent diffuser (30) is installed upstream of the pump body
(2) and, furthermore, a point situated between the outflow section (34) of such diffuser
and the rotary portion of the pump body (2) is connected with the outside air. |