Patent ID: 8746493

Claim:
A tank body of a container arranged inside a frame with a square cross section comprising: a cylindrical main body part; end enclosures arranged at both ends of the cylindrical main body part and fixedly connected with the cylindrical main body part; and a tank body strengthening device, wherein the cylindrical main body part comprises a plurality of surfaces having arc-shaped cross sections, the cylindrical main body part formed by one piece of square sheet material, wherein a cross section of the cylindrical main body part of the tank body is located substantially between the square cross section of the frame and an inscribed circle of the square cross section; and the tank body strengthening device comprises a plurality of strengthening rings fitted and fixed with the cylindrical main body part, each of the strengthening rings arranged inside the cylindrical main body part, a cross section of each of the strengthening ring is substantially a “I ” shape, and wherein each of the strengthening rings comprises an external ring, a middle part and an internal ring, the external ring cylindrically configured and coaxial with the cylindrical main body part, the external ring fixedly connected to the cylindrical main body part, the middle part comprises an annular strengthening plate perpendicular to the external ring, and the internal ring comprises an internal strengthening member having a circular or a ring-shaped cross section and fixedly connected to the inner side of the annular strengthening plate.