Gas burner with multiple gas rings

A gas burner with multiple gas rings designed to be mounted on a top plate of a cooking appliance comprising:

• a central burner having a ring for peripheral flames;
• at least one annular burner having at least one gas ring surrounding the central burner at a certain distance therefrom;
• a burner body designed to be fixed to a bottom surface of the top plate, said burner body having a first gas inlet communicating with a first gas injector, an axis of which is upwardly directed, and a second gas inlet communicating with a second gas injector having a substantially horizontal axis and disposed facing a convergent-divergent pipe forming a venturi, extending across a greater part of a transverse extension of the burner body, said pipe communicating at an end opposite the second injector with a substantially vertical well having an open top;
• an outer burner head supported by support means inserted in a cut-out section of said top plate, by said burner body, said burner head having a substantially annular chamber provided with passages for flames at least around one side and a base having an opening which faces said substantially vertical well of the burner body, a central region having a central, vertical recess, and ports disposed between said annular chamber and said central region, such that said support means for the outer burner head is designed so that said burner head is disposed above and at a distance from the top plate, forming in conjunction therewith an annular space surrounding said central region, said support means having lateral recesses providing a communication between said central recess of the central region and said annular space and;
• an inner burner head centrally supported by said outer burner head facing said central recess of the central region, said inner burner head having a central well coaxially aligned with the axis of said first gas injector, such that all primary air needed to operate the central burner and the annular burner is delivered to the first and second gas injectors exclusively from above the top plate, and secondary air needed for the multiple gas rings is delivered to a bottom portion of the flames exclusively from above the top plate.