Abstract: An evaporator includes a cylindrical aluminum pipe, and two aluminum flanges which are fixed to both end surfaces of the aluminum pipe by screws. Screw holes into which screws are inserted can be formed in the wall of the aluminum pipe in a direction of the axis of the aluminum pipe simultaneously upon extrusion of the aluminum pipe. Communicating holes formed in the flanges communicate each set of two adjacent through holes among a plurality of the through holes formed in the wall of the aluminum pipe, thereby constructing one continuous coolant flow path inside the evaporator.

Abstract: An ice making drum with an improved ice making performance includes a cylindrical drum body, rotational shafts, and shaft members respectively provided at the end faces of the drum body. The drum body has refrigerant flow passages which are each defined by an outer wall portion forming an outer surface, an internal wall portion set apart from the outer wall portion inwardly in a radial direction, and adjoining partition portions extending between the outer wall portion and the internal wall portion. The whole drum body is integrally formed of the same metallic material.