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.
Claims3
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, comprising:
- a liquid injection piping connecting the downstream side of said condenser to said compressor which is a scroll 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 electromagnetic valve and a check valve provided in said bypass 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, an amount of a liquid injection into said scroll compressor is controlled so that an evaporating temperature of said evaporator covers a range of −60 to +5° C.
A refrigerating apparatus, comprising:
- refrigerating cycle composed by sequentially connecting a scroll compressor, a condenser, a liquid receiver, an accumulator, an expansion valve and an evaporator, comprising:
- a liquid injection piping connecting the downstream side of said condenser to said scroll compressor;
- an electronic expansion valve provided in said liquid injection piping so as to control an amount of a liquid injected into said scroll 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;
- means for detecting a temperature of intake air to said condenser;
- and
- a pressure controller controlling a degree of opening of said electronic expansion valve and said motor for said blower according to values detected by said detecting means, and detecting a pressure of said condenser and decrease, when the pressure reaches a present high pressure valve, a capacity of said compressor by decreasing revolutions of said compressor motor, whereas increase, when the pressure reaches a present low pressure value, a capacity of said compressor by increasing revolutions of said compressor motor.
Dependencies are inferred from the claim text.