Reducing Discharge Energy Loss of a Screw Compressor

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  • スクリュー圧縮機の吐出損失動力の低減
  • スクリュー アッシュクキ ノ トシュツ ソンシツ ドウリョク ノ テイゲン

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Pressure loss of compressed air in discharge process decreases isentropic efficiency of a screw type compressor, because of excess compression energy for pressure loss. For this reason, we tried to reduce the pressure loss. Pressure inside a case was measured via a pressure transducer which was located in a female rotor. And discharge energy loss was estimated by analyzing a pressure diagram. The pressure loss is significantly influenced by shape of a discharge port. We examined their relation by comparing the pressure loss between three types of the discharge port with different shape of center convex. As a result, it was revealed that shortening convex of the discharge port causes decrease of discharge energy loss and degradation of volumetric efficiency. Therefore, in order to improve isentropic efficiency, the shape of center convex should be determined to minimize degradation of volumetric efficiency and to maximize decrease of discharge energy.

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