| 摘要 |
PROBLEM TO BE SOLVED: To reduce costs, prevent corrosion, and improve durability by forming piping for a water circulation circuit with aluminum alloy, forming a connecting member of the piping with a cupper alloy material, and covering its outer surface with a metallic material having small corrosion potential difference with respect to the aluminum alloy. SOLUTION: A receiver tank 5 is formed with special alloy serving aluminum as a main body and having strength withstarding the pressure of compressed air. A heat exchanger 11 is also formed with aluminum alloy having a high thermal conduction ratio. Each piping connected to each apparatus, namely, a delivery pipe 4, a water piping 12, a cooling piping 14, and the like are simultaneously formed with aluminum alloy. In a piping coupler as a connecting part of the piping, namely, in a joint, a sleeve and a sleeve nut, an easily passivated metallic surface treating material such as nickel chrome plating, electroless nickel plating, or the like is applied to a surface of a base material made of cupper alloy, and the whole of the base material is covered.
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