Refrigerating apparatus

A refrigerating apparatus constituting a refrigerating cycle by sequentially connecting a compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator, wherein a triple-mixed refrigerant composed of 40-48 wt % of R-125, 47-57 wt % of R-143a and up to 10 wt % of R-134a is used as a refrigerant for said refrigerating cycle, ester oil, ether oil, or ester oil and ether oil is used as refrigerator oil, said compressor is composed of a scroll compressor, the downstream side of said condenser is connected to said scroll compressor through a liquid injection piping, and means for controlling an amount of a liquid injected into said compressor is provided in said liquid injection piping, wherein said condenser uses a heat exchanger whose piping has a diameter smaller than the refrigerant piping of a heat exchanger constituting said evaporator.

A refrigerating apparatus constituting a refrigerating cycle by sequentially connecting a compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator, wherein a triple-mixed refrigerant composed of 40-48 wt % of R-125, 47-57 wt % of R-143a and up to 10 wt % of R-134a is used as a refrigerant for said refrigerating cycle, ester oil, ether oil or ester oil and ether oil is used as refrigerator oil, said compressor is composed of a scroll compressor, the downstream side of said condenser is connected to said scroll compressor through a liquid injection piping, and means for controlling an amount of a liquid injected into said compressor is provided in said liquid injection piping, wherein the refrigerating piping of said heat exchanger constituting said condenser has a diameter of about 7 mm.

A refrigerating apparatus constituting a refrigerating cycle by sequentially connecting a compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator, wherein a triple-mixed refrigerant composed of 40-48 wt % of R-125, 47-57 wt % of R-143a and up to 10 wt % of R-134a is used as a refrigerant for said refrigerating cycle, ester oil, ether oil or ester oil and ether oil is used as refrigerator oil, said compressor is composed of a scroll compressor, the downstream side of said condenser is connected to said scroll compressor through a liquid injection piping, and means for controlling an amount of a liquid injected into said compressor is provided in said liquid injection piping, wherein an amount of a liquid injected into said scroll compressor is controlled so that an evaporating temperature of said evaporator covers a range of -60 to +5.degree. C.

A refrigerating apparatus constituting a refrigerating cycle by sequentially connecting a compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator, wherein a mixed refrigerant containing at least R-125 and R-143a is used as a refrigerant for said refrigerating cycle, ester oil, ether oil or ester oil and ether oil is used as refrigerator oil and a liquid injection type scroll compressor is used as said compressor, wherein a bypass piping is provided to connect the discharge side piping of said compressor to the outlet side piping of said evaporator and wherein an electromagnetic valve and a check valve are provided in said bypass piping.

A refrigerating apparatus constituting a refrigerating cycle by sequentially connecting a compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator, wherein a triple-mixed refrigerant composed of 40-48 wt % of R-125, 47-57 wt % of R-143a and up to 10 wt % of R-134a is used as a refrigerant for said refrigerating cycle, ester oil, ether oil or ester oil and ether oil is used as refrigerator oil, said compressor is composed of a scroll compressor, the downstream side of said condenser is connected to said scroll compressor through a liquid injection piping, and means for controlling an amount of a liquid injected into said compressor is provided in said liquid injection piping, wherein said liquid injection amount control means is an electronic expansion valve provided in said liquid injection piping and a controller is provided to adjust an amount of an injected liquid by controlling a degree of opening of said electronic expansion valve in response to a discharge said temperature of said compressor.

A refrigerating apparatus constituting a refrigerating cycle by sequentially connecting a scroll compressor, a condenser, a liquid receiver, and accumulator, an expansion valve and an evaporator, wherein the downstream side of said condenser and said scroll compressor are connected through a liquid injection piping, means for controlling an amount of a liquid injected into said compressor is provided in said liquid injection piping, a mixed refrigerant comprising at least R-125 and R-143a is used as a refrigerant or said refrigerating cycle, and an ester oil used as a refrigerant oil has a dynamic viscosity of 2-70 cSt at 40.degree. C. and 1-9 cSt at 100.degree. C.

A refrigerating apparatus constituting a refrigerating cycle by sequentially connecting a scroll compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator, wherein the downstream side of said condenser and said scroll compressor are connected through a liuqid injection piping, means for controlling an amount of a liquid injected into said compressor is provided in said liquid injection piping, a refrigerant composed at least of R-125 and R-143a is used as a refrigerant for said refrigerating cycle, an ester oil used as a refrigerant oil has a dynamic viscosity of 2-70 cSt at 40.degree. C. and 1-9 cSt at 100.degree. C., and said liquid injection amount control means includes an injection valve or an electronic expansion valve provided in said liquid injection piping so as to control an amount of an injected liquid.