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.
Claims11
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 said compressor is a scroll compressor and said refrigerating apparatus further comprises:
- a liquid injection piping connecting the downstream side of said condenser to said compressor;
- an injection valve or an electronic expansion valve provided in said liquid injection piping so as to control an amount of a liquid injected into said compressor;
- a bypass piping connecting the discharge piping of said compressor to the outlet piping of said evaporator;
- and
- an electromagnet valve and a check valve provided in said bypass piping.
A refrigerating apparatus for constituting a refrigerating cycle including at least a scroll compressor, a condenser, a mixed refrigerant containing at least R-125 and R-143a, and a refrigerator oil composed of ester oil, the refrigerating apparatus further comprising:
- piping connecting downstream of said condenser to said scroll compressor, said piping including an electromagnetic valve and a capillary provided downstream of said electromagnetic valve, and a strainer provided upstream of said electromagnetic valve.
A refrigerator comprising a scroll compressor, a condenser, a liquid receiver, a mixed refrigerant containing at least R-125 and R-143a, and a refrigerator oil composed of ester oil, the refrigerator further comprising:
- a liquid injection piping connecting downstream of said liquid receiver to said scroll compressor,
- expansion equipment provided in said liquid injection piping,
- an electromagnetic valve provided upstream of said expansion equipment in said liquid injection piping, and
- a strainer provided upstream of said electromagnetic valve.
A refrigerating apparatus constituting a refrigerating cycle by including at least a compressor, a condenser and a liquid receiver, further comprising:
- a dryer disposed in said refrigerating cycle downstream side of said liquid receiver to remove water mixed into said refrigerating cycle;
- a liquid injecting piping connecting between said condenser and said dryer to said compressor;
- and
- an expansion valve provided in said liquid injection piping so as to control an amount of a liquid injected into said compressor,
- wherein a strainer is provided upstream side of said expansion valve in said liquid piping.
A refrigerating apparatus constituting a refrigerating cycle by including at least a compressor, a condenser and a liquid receiver, further comprising:
- a dryer disposed in said refrigerating cycle downstream side of said liquid receiver to remove water mixed into said refrigerating cycle;
- a liquid injecting piping connecting between said condenser and said dryer to said compressor;
- and
- an expansion valve provided in said liquid injection piping so as to control an amount of a liquid injected into said compressor,
- wherein a mixed refrigerant containing at least R-125 and R-143a is used as a refrigerant, and ether oil or ester oil is used as a refrigerator oil and a liquid injection type scroll compressor is used as said compressor.
A refrigerating apparatus for constituting a refrigerating cycle by including at least a liquid injection type scroll compressor, a condenser, a liquid receiver, a mixed refrigerant containing at least R-125 and R-143a, and a refrigerator oil composed of ether oil or ester oil, the apparatus further comprising:
- a dryer disposed in said refrigerating cycle downstream side of said liquid receiver to remove water mixed into said refrigerating cycle;
- a liquid injecting piping connecting between said condenser and said dryer to said compressor;
- and
- an expansion valve provided in said liquid injection piping so as to control an amount of a liquid injected into said compressor,
- a blower for supplying external air to said condenser and a revolution controllable motor for said blower;
- and
- a controller controlling said motor for said blower according to a temperature of intake air to said condenser.
A refrigerating apparatus for constituting a refrigerating cycle by including at least a liquid injection type scroll compressor, a condenser, a liquid receiver, a mixed refrigerant containing at least R-125 and R-143a, and a refrigerator oil composed of ether oil or ester oil, further comprising:
- a dryer disposed in said refrigerating cycle downstream side of said liquid receiver to remove water mixed into said refrigerating cycle;
- a liquid injecting piping connecting between said condenser and said dryer to said compressor;
- and
- an expansion valve provided in said liquid injection piping so as to control an amount of a liquid injected into said compressor,
- wherein a degree of opening of said expansion valve is varied according to a temperature of intake air to said condenser.
Dependencies are inferred from the claim text.