Refrigerating device

Abstract

A first refrigeration circuit for a refrigerating apparatus which is formed into a two-stage cascade refrigerating cycle by establishing connection between a high temperature-side refrigerant circuit and a low temperature-side refrigerant circuit through a refrigerant heat exchanger, and a second refrigeration circuit which is formed into a refrigerating cycle different from that of the first refrigeration circuit are provided. A liquid piping line of the high temperature-side refrigerant circuit and a liquid piping line of the second refrigeration circuit are connected together through a first connection piping line and a suction-side gas piping line of the high temperature-side refrigerant circuit and a suction-side gal line of the second refrigeration circuit are connected together through a second connection piping line. Switching members are disposed for selective circulation of a refrigerant of the second refrigeration circuit to the refrigerant heat exchanger of the first refrigeration circuit through each of the connection piping lines, whereby, even when a heat source equipment stops operating in a two-stage cascade refrigerating cycle refrigeration system applied to a showcase or the like, it becomes possible to achieve continuation of refrigeration operation.

Dependencies are inferred from the claim text.