Also known as steam pot, cooking pot, sandwich steam pot. It usually consists of a pot body and legs. The pot body is a double-layer structure composed of an inner and outer spherical pot body, and the middle layer is heated by steam. There are fixed, tiltable, stirring and other styles. The jacketed pot has the characteristics of large heating area, high thermal efficiency, uniform heating, short boiling time of liquid material, easy control of heating temperature, beautiful appearance, easy installation, convenient operation, safety and reliability.