DIRECT FLAME BOILER, IN PARTICULAR FOR A GENERATOR OF COOLANT VAPOR FOR ABSORPTION THERMAL MACHINES, AND GENERATOR INCLUDING SUCH A BOILER

Direct flame boiler (100), characterized in that it comprises at least: - a first body (1) which extends along a substantially vertical reference axis (X) and at least partially encloses a first internal cavity (2) suitable for receiving a liquid solution; - a second body (10) which, with reference to said substantially vertical axis (X), is arranged below said first body (2) and at least partially encloses a second internal cavity (12) in which there is placed a burner ( 11) capable of generating heat to keep the liquid solution in the first internal cavity (2) boiling; - a third body (10B) which is arranged for at least a part thereof around the second body (10), said second and third bodies (10, 10B) delimiting between them a third internal cavity (13) which is arranged, for at least a part thereof, laterally around said second cavity (12); and - a fourth body (20) which is interposed between said first body (1) and said second body (10) and is at least integrally connected to them, said fourth body (20) being configured so that hot fumes (Fc) produced by the burner (11 ) flows through it flowing from said second internal cavity (12) towards the outer surface (6) of the first body (1) and flows of said liquid solution flow through it flowing from said first internal cavity (2) into said third internal cavity (13), wherein said fourth body (20) comprises one or more first through holes (21) which extend in a direction transverse to said substantially vertical reference axis (X) and are configured to put said first internal cavity (2) in communication with said third internal cavity (13).