| 摘要 |
PROBLEM TO BE SOLVED: To regulate the rise of inlet pressure at the time of the low discharge pressure of a compressor by simple structure, to prevent the occurrence of dewing in a compartment due to the insufficient function of an evaporator. SOLUTION: A valve unit driving means 50 is provided which is making a valve element 43 move in a direction nearing the valve element 43 to a valve seat 35 when pressure Ps is increased, in accordance with the pressure Ps in a low-pressure chamber 34; and making the valve element 43 move in a direction receding from the valve seat 35 when the pressure Ps is reduced. Also, valve seat driving means 36 and 55 are provided which is making the valve seat 35 move in a direction receding from the valve element 43 when the different pressure (Pd-Pc) is increased in accordance with the different pressure between the pressure Pd in a high-pressure chamber 32 and pressure Pc in a middle pressure chamber 33; and move the valve seat 35 in a direction nearing the valve seat 35 to the valve element 43 when the different pressure (Pd-Pc) is reduced. |
