In an ejector-type depressurizer, a nozzle arrangement converts pressure energy
of refrigerant supplied from a radiator into velocity energy to depressurize and
expand the refrigerant, and a pressurizer arrangement mixes the refrigerant discharged
from the nozzle arrangement with the refrigerant drawn from an evaporator and converts
the velocity energy of the refrigerant discharged from the nozzle arrangement into
pressure energy to increase the pressure of the mixed refrigerant discharged from
the pressurizer arrangement. The pressurizer arrangement includes a refrigerant
passage that conducts the refrigerant supplied from the nozzle arrangement and
the refrigerant supplied from the evaporator, and the refrigerant passage includes
a refrigerant passing zone, through which the refrigerant from the nozzle arrangement
and the refrigerant from the evaporator mainly pass during operation of the ejector-type
depressurizer. A cross sectional size of the refrigerant passing zone of the refrigerant
passage is variable.
