Aerosol-generation device

An aerosol-generation device, configured to heat an aerosol-forming substrate to generate an aerosol for inhalation, and comprising:

• a cavity, configured to receive the aerosol-forming substrate;
• a heater, configured to heat the aerosol-forming substrate received in the cavity, the heater having a first end and a second end respectively disposed at two opposite sides of the cavity;
• a heat insulation tube, arranged outside the heater, wherein the heat insulation tube has an inner tube and an outer tube that are arranged along a radial direction of the cavity, and a sealing space is formed between the inner tube and the outer tube;
• and the sealing space is filled with gas;
• and
• a first end cap disposed at the first end of the heater, the first end cap comprising a retaining portion extending toward the second end of the heater, the retaining portion abutting against an outer surface of the heater and abutting against an inner surface of the heat insulation tube to be sandwiched between the heater and the heat insulation tube along the radial direction of the cavity;
• a second end cap disposed at the second end of the heater, the second end cap comprising an outer cylinder extending toward the first end of the heater, the outer cylinder abutting against the outer surface of the heater and abutting against the inner surface of the heat insulation tube to be sandwiched between the heater and the heat insulation tube along the radial direction of the cavity;
• a heat insulation layer, arranged between the heater and the heat insulation tube.