Gas burner for cooking appliances

A gas burner for cooking appliances, having a main flame ring and a simmering flame ring vertically overlapping each other, comprising:

• an injector holder assembly associated with a first injector and a second injector, the injector holder assembly being adapted to be positioned below a cooktop at an opening made therein;
• and
• a head assembly of the gas burner associated at a top with the injector holder assembly and adapted to be positioned above the cooktop at the opening made therein, the head assembly comprising therein a first chamber in communication with the first injector and with a plurality of doors for ejecting a mixture of gas and primary air supplied to the main flame ring, and a second chamber in communication with the second injector and with a passageway for ejecting the mixture of gas and primary air supplied to the simmering flame ring,
• wherein:
• the second chamber is in communication with a through opening defined in outer side walls of the head assembly for introducing the primary air from above the cooktop,
• the head assembly is configured to completely seal from above the opening in the cooktop where the gas burner is intended to be installed,
• the second chamber is in communication with the second injector via a vertical axial duct made in the head assembly and facing the second injector, and
• the through opening for introducing the primary air from above the cooktop comprises at least one duct which crosses the outer side walls and directly ends in the vertical axial duct.