| 摘要 |
PROBLEM TO BE SOLVED: To appropriately maintain the feed rate of a high temperature refrigerant to cascade condensers in a two-refrigerant refrigerator with a high temperature refrigerant circuit simplified. SOLUTION: Two refrigerating circuits (50a, 50b) and one cascade circuit (60) are connected in parallel to with an outdoor circuit (30) to constitute the high temperature refrigerant circuit (20), refrigerating units (13a, 13b) respectively house refrigerating evaporators (53a, 53b) of the refrigerating circuits (50a, 50b), an intermediate heat exchanger (66) is connected to the cascade circuit (60) with a cascade expansion valve (61) provided at the upstream of this heat exchanger (66), the opening of the cascade expansion valve (61) is adjusted, based on the outlet refrigerant temperature of the heat exchanger (66), a low temperature refrigerant circuit (70) is connected to the heat exchanger (66), and two refrigerating evaporators (76a, 76b) are parallel connected to the low temperature refrigerant circuit (70) and housed in the refrigerating units (14a, 14b), respectively.
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