| 摘要 |
PURPOSE:To prevent the thermal deformation of a casing accompanied by the temperature rise of the discharged gas and permit the operation with the high discharge pressure having a high-temperature, by forming a cooling-water flow passage on the outer periphery of the discharge passage of the oil free screw fluid machinery. CONSTITUTION:A vacant chamber 15 for the flow of cooling water is formed in a casing 1, and the cooling water is allowed to flow into an effluence port 15b from in an inflow port 15a. In this case, an annular flow passage 21 for the cooling water is formed by a partitioning wall 20 on the outer periphery of a discharged-gas passage 14. The cooling water is allowed to flow in the casing 1 through an annular passage 21 from the inflow port 15a, and the cooling effect in the vicinity of the outer periphery of the discharged-gas passage 14 is improved.
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