JPS6293660U

JPS6293660U -

Info

Publication number: JPS6293660U
Application number: JP18501285U
Authority: JP
Priority date: 1985-11-29
Filing date: 1985-11-29
Publication date: 1987-06-15

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例による冷凍装置の
冷媒回路図、第２図は従来の冷媒回路図である。１：第１の圧縮機、２：第２の圧縮機、３：凝
縮器、４：膨脹弁、５：蒸発器、６：切換四方弁
、７：逆止弁。なお、図中、同一符号は同一又は
相当部分を示す。 FIG. 1 is a refrigerant circuit diagram of a refrigeration system according to an embodiment of this invention, and FIG. 2 is a conventional refrigerant circuit diagram. 1: first compressor, 2: second compressor, 3: condenser, 4: expansion valve, 5: evaporator, 6: switching four-way valve, 7: check valve. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

The second compressor has a first compressor and a second compressor, and the discharge gas of the first compressor passes through the second compressor, a condenser, an expansion valve, and an evaporator, and is sucked into the first compressor again. In a stage compression type refrigeration system, a four-way switching valve is provided in the discharge gas line of the first compressor, and by switching the four-way valve, the discharge gas of the first compressor is transferred to the second compressor, the condenser, and the expansion valve. and a two-stage compression refrigeration cycle in which the gas is sucked into the first compressor again via the evaporator, a check valve that allows the gas discharged from the first compressor to flow only from the switching four-way valve to the condenser, the condenser, and the expansion valve. , a single-stage compression refrigeration cycle in which the refrigerant gas is sucked into the first compressor via the evaporator, and the refrigerant gas is sucked from the evaporator into the second compressor via the four-way switching valve, and then passes through the condenser and expansion valve to the evaporator again. A refrigeration system characterized in that a single-stage parallel compression type refrigeration cycle is carried out in the refrigeration cycle flowing into the refrigeration cycle, and the switching of the four-way switching valve is switched to the single-stage parallel compression type refrigeration cycle side when the evaporation temperature is high.