Electronic vaporization device and vaporizer thereof

A vaporizer, comprising:

• a liquid storage housing;
• a vent tube arranged in the liquid storage housing, a liquid storage cavity being formed between an inner surface of the liquid storage housing and an outer surface of the vent tube;
• a piston sealingly arranged between the inner surface of the liquid storage housing and the outer surface of the vent tube, the piston having a first surface and a second surface arranged opposite each other, the first surface being in communication with atmosphere, the second surface being in communication with the liquid storage cavity;
• and
• a mouthpiece arranged at an upper end of the liquid storage housing, the mouthpiece comprising a mouthpiece portion,
• wherein an annular air cavity is formed between a lower end surface of the mouthpiece portion and the first surface, the annular air cavity being in communication with the atmosphere through an annular spacing formed between the lower end surface of the mouthpiece portion and the upper end surface of the liquid storage housing, and
• wherein the piston is movable in the liquid storage housing under air pressure of the atmosphere so as to change a volume of the liquid storage cavity, and
• wherein the annular spacing is arranged at a radially outermost periphery of the vaporizer such that air from the atmosphere is configured to enter the annular spacing in a radially inward direction from the radially outermost periphery and subsequently enter the annular air cavity as the piston moves away from the mouthpiece.