Air heating assembly, heating module, controllable heating module, and electronic cigarette device

An air heating assembly, comprising:

• a heat retention part, wherein a plurality of air heating passages are arranged in the heat retention part;
• and
• a first heating element disposed inside and integrally formed with the heat retention part by sintering and a second heating element disposed on an outer surface of the heat retention part, wherein the second heating element is a resistance heating circuit coated on the outer surface of the heat retention part, and the first heating element and the second heating element are configured to heat gas passing by the air heating passages, and the heated air is used to heat cigarettes;
• wherein each of the air heating passages is configured along a central axis of the heat retention part, each of the air heating passages extends in a spiral or wavy shape, so as to extend a heating route;
• wherein each of the air heating passages is a concave provided in a sidewall of the heat retention part, the heat retention part comprises a first end and a second end disposed opposite to each other, each of the air heating passage passes through the heat retention part along a direction from the first end to the second end, the heat retention part consists of sintered silicon dioxide, sintered alumina, sintered silicon nitride or sintered silicon carbide.