Refrigerating apparatus
AssigneeHitachi, Ltd.
InventorsMakoto Fujita, Yoshikazu Amo
Life of this patent
Estimating the term…
Abstract
A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.
Claims30
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 and/or ether oil is used as refrigerator oil and a liquid injection type scroll compressor is used as said compressor.
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 and/or ether oil is used as refrigerator oil and a liquid injection type scroll compressor is used as said compressor.
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 and/or 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.
A refrigerating apparatus, comprising:
- a refrigerating cycle composed by sequentially connecting a scroll compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator;
- 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 used as a refrigerant for said refrigerating cycle;
- refrigerator oil composed of ester oil;
- a liquid injection piping connecting the downstream side of said condenser to said scroll compressor;
- means provided in said liquid injection piping for controlling an amount of a liquid injected into said compressor;
- a revolution-controllable motor for driving said scroll compressor;
- a blower for supplying external air to said condenser and a revolution controllable motor for said blower;
- means for detecting a discharge temperature of said compressor;
- means for detecting a liquid temperature of said condenser;
- and
- means for detecting a temperature of intake air to said condenser, wherein said liquid injection amount control means and the motor of said blower are controlled according to values detected by said detecting means.
A refrigerating apparatus, comprising:
- a refrigerating cycle composed by sequentially connecting a scroll compressor, a condenser, a liquid receiver, a dryer, an expansion valve, an evaporator, a strainer and an accumulator;
- 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 used as a refrigerant of said refrigerating cycle;
- refrigerator oil composed of ester oil;
- a liquid injection piping connecting the downstream side of said condenser to said scroll compressor;
- means provided in said liquid injection piping for controlling an amount of a liquid injected into said compressor, wherein a desiccating agent used for said dryer is composed of synthesized zeolite in which each of fine holes extending to molecule adsorbing cavities in a crystal structure has a diameter equal to or less than 3.3 angstroms which is smaller than a molecule of the hydrocarbon fluoride refrigerant which does not contain chloride and larger than a molecule of water.
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 double-mixed refrigerant composed of R-125 and R-143a is used as a refrigerant for said refrigerating cycle, ester 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.
A refrigerating apparatus, comprising:
- a refrigerating cycle composed by sequentially connecting a scroll compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator;
- a double-mixed refrigerant composed of R-125 and R-143a used as a refrigerant for said refrigerating cycle;
- refrigerator oil composed of ester oil;
- a liquid injection piping connecting the downstream side of said condenser to said scroll compressor;
- means provided in said liquid injection piping for controlling an amount of a liquid injected into said compressor;
- a revolution-controllable motor for driving said scroll compressor;
- a blower for supplying external air to said condenser and a revolution controllable motor for said blower;
- means for detecting a discharge temperature of said compressor;
- means for detecting a liquid temperature of said condenser;
- and
- means for detecting a temperature of intake air to said condenser, wherein said liquid injection amount control means and the motor of said blower are controlled according to values detected by said detecting means.
A refrigerating apparatus, comprising:
- a refrigerating cycle composed by sequentially connecting a scroll compressor, a condenser, a liquid receiver, a dryer, an expansion valve, an evaporator, a strainer and an accumulator;
- a double-mixed refrigerant composed of R-125 and R-143a used as a refrigerant of said refrigerating cycle;
- refrigerator oil composed of ester oil;
- a liquid injection piping connecting the downstream side of said condenser to said scroll compressor;
- means provided in said liquid injection piping for controlling an amount of a liquid injected into said compressor, wherein a desiccating agent used for said dryer is composed of synthesized zeolite in which each of fine holes extending to molecule adsorbing cavities in a crystal structure has a diameter equal to or less than 3.3 angstroms which is smaller than a molecule of the hydrocarbon fluoride refrigerant which does not contain chloride and larger than a molecule of water.
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° C. and 1-9 cSt at 100° 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° C. and 1-9 cSt at 100° 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.
Dependencies are inferred from the claim text.