US Patent 9763462 Ice cream machine

Provided is an ice cream machine comprises a housing on which a compressor, a condenser, an evaporator, a stirring tank, a stirring shaft, a motor, a feeding bowl, a discharge valve and a control panel are arranged. The stirring tank comprises an inner tank body and an outer tank body, the evaporator comprises a helical element and a close element, and a cross section of the helical element is rectangular, an inner surface of the helical element is securely welded with outer wall of the inner tank body, and concave and convex surfaces which are alternately arranged are arranged on a side of the helical element.