Patent ID: 6393858
Filing Date: 2002-05-28
Classification: F24F,F25B,Y02B

Abstract:
A refrigeration system, comprising a heat source side refrigerant circuit (70) having a plurality of refrigerant heat exchangers (50, 60), and a plurality of user-side refrigerant circuits (11, 21) corresponding to the respective refrigerant heat exchangers (50, 60), wherein:the heat source side refrigerant circuit (70) comprises compressors (41, 42), first switching means (43, 44), and heat source side heat exchangers (45, 46) which are respectively switched by the first switching means (43, 44) between a state where they are communicated to a discharge side of the compressors (41, 42) and another state where they are communicated to an suction side thereof; one end of a high pressure gas pipe (LG-H) is connected between the discharge side of the compressors (41, 42) and the first switching means (43, 44), one end of a low pressure gas pipe (LG-L) is connected between the suction side of the compressors (41, 42) and the first switching means (43, 44), and one end of a liquid pipe (LL) is connected to a liquid side of the heat source side heat exchangers (45, 46); the pipes (LG-H, LG-L, LL) at the other end are branched into branch pipes (LG-H1, LG-H2, LG-L1, LG-L2, LL1, LL2), respectively; one end side of the refrigerant heat exchanger (50) of one of the plurality of user-side refrigerant circuits (11, 21) is connected to one of the branch pipes (LL1, LL2) of the liquid pipe (LL), and one end side of the refrigerant heat exchanger (60) of the other one of the plurality of user-side refrigerant circuits (11, 21) is connected to the other one of the branch pipes (LL1, LL2) of the liquid pipe (LL); the other end side of the one refrigerant heat exchanger (50) is configured so as to be switched by second switching means (52) between a state where it is communicated to one of the branch pipes (LG-H1, LG-H2) of the high pressure gas pipe (LG-H) and another state where it is communicated to one of the branch pipes (LG-L1, LG-L2) of the low pressure gas pipe (LG-L); and the other end side of the other one refrigerant heat exchanger (60) is configured so as to be switched by second switching means (62) between a state where it is communicated to the other one of the branch pipes (LG-H1, LG-H2) of the high pressure gas pipe (LG-H) and another state where it is communicated to the other one of the branch pipes (LG-L1, LG-L2) of the low pressure gas pipe (LG-L); and the heat source side refrigerant circuit (70) and the user-side refrigerant circuits (11, 21) are configured so that a heat source side refrigerant circulating through the heat source side refrigerant circuit (70) and user-side refrigerants circulating through the user-side refrigerant circuits (11, 21) exchange heat with each other at the refrigerant heat exchangers (50, 60), thereby performing a multi-stage cascade refrigerating cycle.