Abstract: The present disclosure relates to a double cooking container having improved stability and improved heating efficiency. Particularly, the double cooking container has a double structure in which an inner cylinder is formed inside an outer cylinder, a heat retaining space formed by inserting the inner cylinder into the inside of the outer cylinder and thus maintaining a predetermined interval between the bottom of the outer cylinder and the bottom of the inner cylinder, and a side fluid channel formed between the outer cylinder and the inner cylinder to communicate with the heat retaining space, wherein a plurality of discharge holes communicating with the side fluid channel are formed in the outer cylinder, and the entire sectional area of the discharge holes is controlled to be within a predetermined range in order to implement high heating efficiency as well as ensure stability.

Abstract: The present invention relates to a low vacuum and vacuum release device for an electric rice cooker, the device being capable of releasing a vacuum and maintaining a vacuum state by the rotation of an operation lever.

Abstract: The present disclosure relates to a double cooking container having improved stability and improved heating efficiency. Particularly, the double cooking container has a double structure in which an inner cylinder is formed inside an outer cylinder, a heat retaining space formed by inserting the inner cylinder into the inside of the outer cylinder and thus maintaining a predetermined interval between the bottom of the outer cylinder and the bottom of the inner cylinder, and a side fluid channel formed between the outer cylinder and the inner cylinder to communicate with the heat retaining space, wherein a plurality of discharge holes communicating with the side fluid channel are formed in the outer cylinder, and the entire sectional area of the discharge holes is controlled to be within a predetermined range in order to implement high heating efficiency as well as ensure stability.

Abstract: Electric rice cooker comprises: an upper casing unit having a valve unit discharging pressure; an inner bowl arranged beneath the upper casing unit and containing food; a heat insulating outer bowl enclosing the inner bowl and forming a first heat sustaining space between the inner and outer bowls; a lower casing unit enclosing the heat insulating outer bowl and having air supply ports; a lower heating unit, interposed between the heat insulating outer bowl and the inner bowl, for generating heat; an upper heater unit arranged inside the upper casing unit to operate with the lower heater unit; a vacuum packing unit interposed between the upper casing unit and the inner bowl to cut off air flow; a stopper groove formed along an edge of the upper casing unit facing the inner bowl; and a stopper protrusion for causing the vacuum packing unit to be caught at the stopper groove.