Incubator

An incubator comprising:

• a culture chamber that comprises an insulated door and insulated walls;
• a circulation device configured to circulate air in the culture chamber;
• a temperature regulating device configured to regulate a temperature of the air in the culture chamber;
• and
• a humidifying device configured to humidify the air in the culture chamber,
• wherein the humidifying device comprises:
• a compressed gas generating device configured to generate a compressed gas;
• a water supply device configured to supply water to the circulation device;
• a mixed gas-liquid regulator fluidly connecting each of the compressed gas generating device and the water supply device to the circulation device and configured to mix gas delivered by the compressed gas generating device and water delivered by the water supply device to form a mist containing a mixture of said gas with said water;
• and
• a vaporizer configured between the mixed gas-liquid regulator and the circulation device to receive and vaporize said mist to produce water vapor that is sterilized and to directly supply said sterilized water vapor to the air circulated by the circulation device without passing said water vapor through an air filter,
• wherein:
• the vaporizer comprises an outer cylindrical tube having a cylindrical shape and a heating element extended in the outer cylindrical tube in parallel with a longitudinal direction thereof,
• the heating element comprises a rod-like heater oriented along said longitudinal direction and an evaporator tube spirally wound around an outer periphery of the heating element.