Positive displacement pump with impeller and method of manufacturing

A rotary positive displacement pump with impeller, where the impeller or rotor (3;

• 3′) defines, within a stator (2, 2′) defining a pumping chamber (20), a plurality of successive chambers (21) with variable volume through which a fluid is mechanically conveyed from an inlet (7) to an outlet (8) of the pump (1;
• 1′),
• said chambers (21) with variable volume being defined, at axially opposite ends, by a pair of rotational surfaces (40, 50;
• 40′, 50′) that axially close said pumping chamber (20) and are arranged to rotate about mutually inclined axes, characterised in that
• the stator (2;
• 2′) and the rotor (3, 4, 5;
• 3′, 4′, 5′) are made of flexible material.

A method of manufacturing a positive displacement pump (1;

• 1′) with impeller, characterised by the steps of:
• providing a stator (2, 2′) defining a pumping chamber (20) made of flexible material;
• mounting an impeller or rotor made of flexible material (3;
• 3′) in said pumping chamber (20);
• closing the pumping chamber (20), at axially opposite ends, by means of a pair of rotational surfaces (40, 50;
• 40′, 50′) having mutually inclined axes and arranged in rotational engagement with the impeller (3;
• 3′).