PIPING WASHING METHOD AND PIPING WASHING APPARATUS FOR REFRIGERATING APPARATUSES

摘要

A closed circuit (13) is configured by connecting upper ends of existing refrigerant pipings (2A, 2B) of a refrigerant circuit with an upper connecting path (11) and lower ends thereof with a lower connecting path (12), and the closed circuit (13) is filled with a refrigerant. A separator (50) on the lower connecting path (12) heats and evaporates liquid refrigerant with a separating heat exchanger coil (52), and collects foreign matters from gaseous refrigerant with a filter (53). Two carrying heat exchangers (7A, 7B) on the lower connecting path (12) give a carrying force to the refrigerant by alternately repeating cooling action to cool the gaseous refrigerant whose phase has been changed by the separator (50) to change its phase to a liquid phase and pressuring action to heat and pressure this liquid refrigerant in a liquid phase state. The refrigerant circulates in the closed circuit (13) from the carrying heat exchangers (7A, 7B) to wash the existing refrigerant pipings (2A, 2B).