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A cooling unit adapted for use in a freezing mechanism, which is composed a metallic cylindrical evaporator housing and a metallic freezing pipe helically wound on an outer periphery of the evaporator housing for thermal contact with the evaporator housing, wherein the freezing pipe is embedded in a

A cooling unit adapted for use in a freezing mechanism, which is composed a metallic cylindrical evaporator housing and a metallic freezing pipe helically wound on an outer periphery of the evaporator housing for thermal contact with the evaporator housing, wherein the freezing pipe is embedded in a metal layer formed by slip casting of a low melting point alloy such as aluminum alloy, tin alloy or magnesium alloy on the outer periphery of the evaporator housing.

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1. A cooling unit adapted for use in a freezing mechanism, comprising a metallic cylindrical evaporator housing and a metallic freezing pipe helically wound on an outer periphery of the evaporator housing forming a series of coil segments for thermal contact with the evaporator housing,wherein conse

1. A cooling unit adapted for use in a freezing mechanism, comprising a metallic cylindrical evaporator housing and a metallic freezing pipe helically wound on an outer periphery of the evaporator housing forming a series of coil segments for thermal contact with the evaporator housing,wherein consecutive ones of the coil segments contact each other along a helically shaped line of contact defining a first freezing pipe surface section facing exteriorly relative to the line of contact and a space formed between the contacting coil segments, respective second freezing pipe surface sections of the consecutive ones of the coil segments facing interiorly relative to the line of contact and the outer periphery of the evaporator housing, wherein said freezing pipe is embedded in a metal layer formed by slip casting of a low melting point alloy, the low melting point alloy completely filling the space and completely covering the first freezing pipe surface section. 2. A cooling unit as claimed in claim 1, wherein the metal layer is formed by slip casting of an alloy whose melting point is lower than that of the material of said freezing pipe.3. A cooling unit as claimed in claim 2, wherein the low melting point alloy forming the metal layer is selected from a group consisting of aluminum alloy, tin alloy and magnesium alloy.4. A cooling unit adapted for use in a freezing mechanism of an auger type ice making machine, comprising a metallic cylindrical evaporator housing formed to contain an auger and a metallic freezing pipe helically wound on an outer periphery of the evaporator housing forming a series of coil segments for thermal contact with the evaporator housing,wherein consecutive ones of the coil segments contact each other with portions of each contacting coil segment and the outer periphery of the evaporator housing defining a space and said freezing pipe is embedded in a metal layer formed by slip casting of a low melting point alloy, the low melting point alloy completely filling the space thereby being in complete contact with the portions of each contacting coil segment and the outer periphery of the evaporator housing defining the space and completely covering a surface of the metallic freezing pipe facing exteriorly relative to the evaporator housing. 5. A manufacturing method of a cooling unit adapted for use in a freezing mechanism, comprising the steps of:helically winding a metallic freezing pipe on an outer periphery of a metallic cylindrical evaporator housing in a closed relationship to provide a cooling unit assembly; setting the cooling unit assembly in a mold; and supplying a low melting point alloy in a melted condition into the mold and casting the alloy in the mold to form a metal layer on the outer periphery of the evaporator housing in such a manner that the freezing pipe is embedded in the metal layer. 6. A manufacturing method of a cooling unit as claimed in claim 5, wherein the low melting point alloy in the melted condition is cast under reduced pressure in the mold to form the metal layer on the outer periphery of the evaporator housing.7. A cooling unit adapted for use in a freezing mechanism, comprising:a metallic cylindrical evaporator housing having an outer periphery; a metallic freezing pipe helically wound on the outer periphery for thermal contact with the evaporator housing, the metallic freezing pipe forming a series of coil segments such that consecutive ones of the coil segments contact each other along a helically shaped line of contact to define a first freezing pipe surface section facing exteriorly relative to the line of contact and a space formed between contacting coil segment portions of the metallic freezing pipe defined by respective second freezing pipe surface sections of the consecutive ones of the coil segments facing interiorly relative to the line of contact and the outer periphery of the evaporator housing; and a metal layer of a low melting point alloy completely encasing the first freezing pipe surface section and the low melting point alloy completely filling the space.