REFRIGERATION CYCLE FOR CAR

Japanese Patent JPS6243312

A

PURPOSE:To permit speedy refrigeration by switching the opening degree of an electromagnetic expansion valve in main refrigeration cycle smaller and intermittently in refrigeration operation than in the ordinary operation, in the captioned refrigeration cycle for the refrigeration operation in an auxiliary refrigeration cycle. CONSTITUTION:When refrigeration operation is performed in auxiliary refrigeration cycle, a solenoid valve 10 is opened, and the car interior blow-out temperature Td is detected by an air temperature sensor 12, and compared with the set car interior blow-out temperature To. When Td is higher than To, the valve opening degree (x) of an electric expansion valve 4 is automatically controlled so that the excessive cooling degree SHe of the coolant at the outlet of an evaporator 5 becomes a constant value SHo. On the contrary, when Td