Curing device for tires

A tire curing device including an upper half mold and a lower half mold;

• a toroidal chamber for accommodating a tire to be cured and defined by said half molds;
• a closed circuit for a batch charge of a heat exchange fluid, said toroidal chamber forming part of said closed circuit;
• impeller means for force circulating said heat exchange fluid along said closed circuit, said closed circuit including a delivery conduit and a return conduit for said heat exchange fluid, connected to said toroidal chamber;
• and heating means located along said return conduit, for heating said heat exchange fluid to a predetermined temperature;
• said return conduit being an annular section conduit defined internally by said heating means, and having an annular outlet end;
• said impeller means having an annular inlet end coaxial and aligned with said outlet end;
• said return conduit presenting a section increasing toward said annular outlet end such as to enable expansion of said heat exchange fluid during heating;
• and radially extending guide means along said return conduit for guiding said heat exchange fluid in an axial direction in relation to said impeller means.