REFRIGERATING CYCLE DEVICE

PROBLEM TO BE SOLVED: To provide a refrigerating cycle device in which an expansion valve suitable for refrigerant flow control, reducing refrigerant flow sound and having proof stress to plugging of foreign matter is installed. SOLUTION: A valve chamber 5 provided with an inflow port 32 formed in a side face, and a valve seat 6 formed at a bottom face, is formed inside an expansion valve body part 3 of the expansion valve 1, and a needle 2 that can advance to and retreat from the valve seat 6 is installed penetrating the top face of the valve chamber 5. A needle tip part 4 gradually reduced in diameter in a flow-out direction is formed at the tip of the needle 2, and the valve seat 6 is formed with an orifice inlet part 7 gradually reduced in diameter in the flow-out direction, an orifice center part 8 of approximately cylindrical shape, and an orifice outlet part 9 gradually enlarged in diameter in the flow-out direction. A clearance passage 47 gradually narrowed in the flow-out direction is thereby formed by the needle tip part 4 and the orifice inlet part 7, and the separation of refrigerant flow is reduced in the start position of the orifice center part 89 to reduce noise. COPYRIGHT: (C)2007,JPO&INPIT