| 摘要 |
PURPOSE:To enhance capacity and energy efficiency by forming the injection port at a location to be determined on the basis of the flow speed of the injected gas refrigerant at the intermediate pressure and thereby utilizing the refrigerant injected effectively. CONSTITUTION:An injection port 30 is provided at the intersecting point of No.1 circle A as rotor's 23 position where the internal pressure of cylinder chamber 24a becomes the injection pressure in the rotor's 23 compression stroke with No.2 circle B as rotor's position where rotor's inscribed point 01 with the cylinder chamber 24a is displaced in the backward direction to rotation for an amount corresponding to the time during which the gas refrigerant to be injected is sent forward with respect to the suction port's 28 closing position to reach the suction port 28, on their discharge port 29 side intersection among the two. The injection port 30 is formed so as to begin opening at the rotor position of No.2 circle B and finish closing at the rotor position of No.1 circle A. Thereby sufficient injection of gas refrigerant can be made, that will provide a highly efficient compressor operation with high energy efficiency. |
