`
`1.
`
`A refrigeration apparatus comprising:
`
`a refrigerant circuit in which a refrigerant
`
`discharged from a compressor is.condensed and then
`
`evaporated to exert a cooling function; and
`
`a tank connected to a pipe of the.compressor on a
`
`suction side via a pressure reducing unit,
`
`the pressure
`
`reducing unit being connected in parallel with a check
`
`valve,
`
`the direction of the tank being the forward
`
`10
`
`direction of the check valve.
`
`2.
`
`A refrigeration apparatus comprising:
`
`a high—temperature—side refrigerant circuit and a
`
`15
`
`20
`
`low-temperature-side refrigerant circuit each constituting
`
`an independent refrigerant closed circuit in which a
`
`refrigerant diSCharged from a compressor is condensed and
`
`then evaporated to exert a cooling function, an evaporator
`
`of the high-temperature-side refrigerant circuit and a
`
`condenser of the low—temperature—side refrigerant circuit
`
`constituting a cascade heat exchanger. an evaporator of the
`
`low—temperature—side refrigerant circuit achieving an
`
`extremely low temperature; and
`
`a tank connected to a pipe of the compressor of
`
`the low—temperature-side refrigerant circuit on a suction
`
`25
`
`side via a pressure reducing unit.
`
`the pressure reducing
`
`unit being connected in parallel with a check valve,
`
`the
`
`direction of the tank being the forward direction of the
`
`
`
`check valve.
`
`3.
`
`A refrigeration apparatus comprising: a
`
`compressor, a condenser, an evaporator, and a plurality of
`
`intermediate heat exchangers and a plurality of pressure-
`
`reducing units connected in series so that a refrigerant
`
`fed back from the evaporator circulates, wherein a
`
`plurality of types of non-azeotropic mixed refrigerants are
`
`introduced, a condensed refrigerant in the refrigerants fed
`
`10
`
`through the condenser is allowed to join the intermediate
`
`heat exchanger via the pressure reducing unit, and a non—
`
`condensed refrigerant in the refrigerants is coaled by the
`
`intermediate heat exchanger to successively condense the
`
`rrefrigerant having a lower boiling point, and the
`
`15
`
`refrigerant having the lowest boiling point is allowed to
`
`flow into the evaporator via the final—stage pressure
`
`reducing unit to obtain an extremely low temperature,
`
`the refrigeration apparatus further comprising: a
`
`tank connected to a pipe of the compressor on a suction
`
`side via the pressure reducing unit,
`
`the pressure reducing
`
`unit being connected in parallel with a check valve,
`
`the
`
`direction of the tank being the forward direction of the
`
`check valve.
`
`4.
`
`A refrigeration apparatus comprising: a high—
`
`temperature—side refrigerant circuit and a low—temperature-
`
`side refrigerant circuit each constituting an independent
`
`20
`
`25
`
`
`
`refrigerant closed circuit in which a refrigerant
`
`discharged from a compressor is condensed and then
`
`evaporated to exert a cooling function,
`
`the low—
`
`temperature—side refrigerant circuit having the compressor,
`
`a condenser, an evaporator, and a plurality of intermediate
`
`heat exchangers and a plurality of pressure reducing units
`
`connected in series so that the refrigerant fed back from
`
`the evaporator circulates, wherein a plurality of types of
`
`10
`
`15
`
`non-azeotropic mixed refrigerants are introduced, a
`
`condensed refrigerant in the refrigerants fed through the
`
`condenser is allowed to join the intermediate heat
`
`exchanger via the pressure reducing unit, a non—condensed
`
`refrigerant in the refrigerants is cooled by the
`
`intermediate heat exchanger to Successively condense the
`
`refrigerant having a lower boiling point,
`
`the refrigerant
`
`having the lowest boiling point is allowed to flow into the
`
`evaporator via the final-stage pressure reducing unit, an
`
`evaporator of the high—temperature—side refrigerant circuit
`
`and the condenser of the low-temperature—side refrigerant
`circuit constitute a cascade heat exchanger, and the
`
`20
`
`evaporator of the low—temperature—side refrigerant circuit
`
`obtains an extremely low temperature,
`
`the refrigeration apparatus further comprising: a
`
`tank connected to a pipe of the compressor of the low-
`
`25
`
`temperature-side refrigerant circuit on a suction side via
`
`the pressure reducing unit,
`
`the pressure reducing unit
`
`being connected in parallel with a check valve.
`
`the
`
`
`
`direction of the tank being the forward direction of the
`
`check valve.
`
`
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