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`Notice
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`This translation is machine-generated. it cannot be guaranteed that it is intelligible, accurate,
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`complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
`
`financial decisions, should not be based on machine-translation output.
`
`CLAIMS JP5026736
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`A high temperature side refrigerant circuit and a low temperature side refrigerant circuit each
`
`constituting an independent refrigerant closed circuit which condenses and discharges the
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`refrigerant discharged from the compressor to exhibit a cooling action, wherein the low
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`temperature side refrigerant circuit comprises: A compressor, an evaporator, a plurality of
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`intermediate heat exchangers connected in series so that a returning refrigerant from the
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`evaporator flows, and a plurality of pressure reducing devices, wherein a nonazeotropic mixed
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`refrigerant comprising a plurality of types of refrigerants And a condensing refrigerant in the
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`refrigerant having passed through the condenser is merged into the intermediate heat exchanger
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`via the decompressor, and the uncondensed refrigerant in the refrigerant is cooled by the
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`intermediate heat exchanger, thereby sequentially Condensing the refrigerant having a lower
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`boiling point and allowing the refrigerant of the lowest boiling point to flow into the evaporator
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`through the decompressor of the final stage and by using the evaporator of the high temperature
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`side refrigerant circuit and the condenser of the low temperature side refrigerant circuit
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`Constructs a cascade heat exchanger A refrigerating apparatus comprising a refrigerator having
`an eVaporator of the low temperature side refrigerant circuit and configured to cool the storage
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`compartment in the heat insulating box at an extremely low temperature, comprising: a machine
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`configured on the side of the heat insulating box body and on which the compressors are
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`installed. What is claimed is: 1. An air conditioner comprising: a chamber; an opening formed in a
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`side wall of the heat insulating box body located on the machine room side in a front—to—rear
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`direction and opening rearward; and heat insulating Wherein the cascade heat exchanger is
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`disposed at one end of the heat insulating structure and the piping for connecting the equipment
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`in the heat insulating structure to the equipment outside the heat insulating structure is , The
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`heat insulating structure is disposed so as to be opposed to one end side surface on the side
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`opposite to the side on which the cascade heat exchanger is disposed and the heat insulating
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`structure is disposed so as to face the cascade heat exchanger from the side where the cascade
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`heat exchanger is disposed And is removably inserted into the inside of the heat insulating box
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`body Refrigeration system characterized in that it is arranged on the side wall of the chamber
`side.
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`2. The refrigerating apparatus according to claim 1, wherein a notch is formed in a rear portion
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`of a side wall of the heat insulating box body on the mechanical chamber side corresponding to
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`the opening.
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`The heat insulating box body is formed by a composite configuration of a vacuum heat insulating
`panel and a foam heat insulating material, and the vacuum heat insulating panel is disposed in a
`side wall opposite to the front and rear walls of the heat insulating box body and the machine
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`room Wherein the refrigerating apparatus according to claim 1 or 2 is characterized in that:
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`Powered by EPO and Goegie
`
` steer Traneiate
`
`Notice
`
`This translation is machine—generated. it cannot be guaranteed that it is intelligible, accurate,
`
`complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
`
`financial decisions, should not be based on machine—translation output.
`
`DESCRHWIONJP5026736
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`Refrigeration apparatus
`
`[0001]
`
`The present invention includes a high temperature side refrigerant circuit and a low temperature
`
`side refrigerant circuit each of which constitutes an independent refrigerant closed circuit which
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`condenses the refrigerant discharged from the compressor and evaporates it to exhibit the
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`cooling action, and the high temperature side refrigerant circuit Related to a refrigerating
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`apparatus in which a cascade heat exchanger is constituted by an evaporator and a condenser of
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`a low temperature side refrigerant circuit and a storage chamber constituted in the heat
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`insulating box body is cooled to an extremely low temperature by an evaporator of a low
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`temperature side refrigerant circuit .
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`[0002]
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`Conventionaily, a binary refrigerating apparatus is used for an ultra—low temperature
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`refrigerating apparatus used in the biotechnology field of storing cells, microorganisms and the
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`like, FIG. i0 shows a refrigerant circuit diagram of a refrigerating apparatus 335 using a binary
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`refrigerating apparatus. The refrigerant circuit 100 includes a high-temperature-side
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`refrigeration cycle 101 and a low—temperature-side refrigeration cycle 102. The discharge side
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`pipe 103 D of the compressor 103 constituting the high temperature side refrigeration cycle 101
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`is connected to the auxiliary condenser 105 and the auxiliary condenser 105 is connected to the
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`frame pipe 104 and then condensed via the oil cooler 106 of the compressor 103 Device 107.
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`The condenser 107 is cooled by the condenser blower 116. The outlet side refrigerant pipe of
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`the condenser 107 is connected to the evaporator 1 10 as an evaporator part constituting the
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`evaporator through the dryer 108 and the pressure reducer 109 sequentially. An accumulator
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`1 1 l is connected to the outlet side refrigerant pipe of the evaporator l 10, and the refrigerant
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`pipe exiting the accumulator 111 is connected to the suction side pipe 103 S of the compressor
`103.
`
`[0003
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`On the other hand, an oil separator 1 14 is connected to the discharge side pipe 1 13 D of the
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`compressor 1 13 constituting the low temperature side refrigeration cycle 102, and the
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`refrigerant pipe connected to the outlet side of the oil separator 114 is connected to the inside of
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`the evaporator 1 10 And is connected to a condensing pipe 1 15 as a high temperature side pipe
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`inserted into the condensing pipe 1 15. The condensing pipe 1 15 and the evaporator 110
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`constitute a cascade heat exchanger 130.
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`[0004]
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`The discharge pipe connected to the outlet side of the condensing pipe 1 15 is connected to the
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`first gas-liquid separator l .16 via, a dryer 131, and the separated gas-phase refrigerant is
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`separated by the gas— Passes through the first intermediate heat exchanger 1 17 via the gas phase
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`piping, and flows into the second gas-liquid separator 118. The liquid—phase refrigerant
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`separated by the gas—liquid separator 1 16 flows into the first intermediate heat exchanger 1 17
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`via the liquid phase piping through the dryer 1 19 and the pressure reducer 1.20 to evaporate the
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`gas—phase refrigerant Cooling.
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`[0005]
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`The liquid—phase refrigerant separated by the second gaseiiquid separator 118 flows into the
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`second intermediate heat exchanger 123 via the decornpressor 122 after passing through the
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`dryer 121 by the liquid phase piping. The gas-phase refrigerant separated by the second gas—
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`liquid separator 1 18 passes through the inside of the second intermediate heat exchanger 123
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`via the vapor phase piping, passes through the inside of the third intermediate heat exchanger
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`124, and further And flows into the decompressor 126 via the dryer 125. The decompressor 126
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`is connected to an evaporation pipe 127 as an evaporator disposed so as to be exothermic on the
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`inner wall on the storage compartment side of the insulating box body 132 of the refrigeration
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`apparatus, and the evaporation pipe 127 is connected to the third intermediate heat exchanger
`124.
`
`[0006]
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`The third intermediate heat exchanger 124 is connected to the second and first intermediate heat
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`exchangers one after another and then connected to the suction side pipe 1 13 S of the
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`compressor 1 13. An expansion tank 128 for storing the refrigerant when the compressor 1 13
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`stops is further connected to the suction side pipe 1 13 8 via a decompressor 129.
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`[0007]
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`in such a refrigeration apparatus 135, the evaporation pipe 127 of the low temperature side
`refrigeration cycle 102 has an ultra—low temperature of —l50 ° C. or less, and also in the cascade
`heat exchanger 130, the temperature becomes about —40 ° C. For this reason, it is necessary to
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`sufficiently insulate the cascade heat exchanger 130 portion. Conventionally, as shown in FIG.
`
`1 1, the cascade heat exchanger 130 is provided on the back surface of the heat insulating box
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`132 constituting the main body of the refrigeration device 135 (Refer to Japanese Patent
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`Application Laid—Open No. 20041—328583), which is formed in advance and secured in an
`outwardly opening storage recess 133 and is incorporated after foaming of the heat. insulating
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`materiai of the heat insulating box member 132.
`
`[0008}
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`A heat insulating material is positioned on the peripheral surface of the cascade heat exchanger
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`130, and a gap between the housing recess 133 and the cascade heat exchanger 130 is received,
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`and a flat plate-shaped heat insulating material 134 opens the opening it is covered so as to close
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`the whole. Japanese Unexamined Patent Application Publication No. 2000105047
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`[0009]
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`However, since the cascade heat exchanger 130 has a low temperature of about ‘40 ° C., dew
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`may adhere to the outer surface of the body around the cascade heat exchanger 130. For this
`
`reason, it is necessary to sufficiently insulate the relevant portion, and the thickness of the heat
`insulating material 134 is made extremely thick, and the Cover portion is covered on the outside
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`thereof. However, when the thickness of the heat insulating material 134 is increased, there is a
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`problem that the protruding portion exists by the thickness of the heat insulating material 134
`
`on the back surface portion of the main body, which hinders the installation of the refrigerating
`device 135.
`
`[0010]
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`in particular, when the refrigerating apparatus 135 is carried into a room, inconveniences may
`
`arise in which it is difficult to carry in the refrigeration apparatus 135 while taking it to the
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`loading port of the installation place. Therefore, if the product design is such that the thickness of
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`the heat insulating material of the overhanging portion is secured over the entire body in order
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`to smoothly carry in the loading, unless the outer dimension is increased, the volume in the
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`storage compartment is increased by that much There is a problem that it becomes narrow.
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`[0011]
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`Therefore, in the freezer disclosed in Patent Document 1 as described above, a heat insulating
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`material covering the back surface of the cascade heat exchanger is covered with an inner cover,
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`a second heat insulating material and an outer cover that covers the outer cover are provided
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`outside the inner cover And the outer cover is detachably attached to the inner cover by a
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`plurality of screws. Thus, at the time of carrying-in, by carrying out the loading operation of the
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`refrigerating apparatus in a state where the outer cover is detached, it is possible to avoid the
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`inconvenience that the overhanging portion is caught by the carryingin entrance.
`
`[0012]
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`However, with such a configuration, there is still the overhanging portion on the back surface
`
`portion of the main body at the installation place. Even in such a case, the product design that
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`ensures the thickness of the overhang portion over the entire body , There is a problem that the
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`storage volume becomes narrower with respect to the depth as the external size. Also, after the
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`installation, it is necessary to perform. an operation of attaching the outer cover, and there is a
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`problem that the loading operation becomes complicated.
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`[0013]
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`SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the
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`conventional technical problem, and it is an object of the present invention to provide a
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`refrigerating apparatus having a cascade heat exchanger, which has a thickness dimension of a
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`heat insulating material for covering the cascade heat exchanger The depth dimension of the
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`apparatus itself can be reduced without being influenced by the loading port of the refrigerating
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`apparatus, and the refrigerating apparatus can be easily loaded, from a normal loading port.
`
`[0014}
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`The refrigeration apparatus of the present invention includes a high temperature side refrigerant
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`circuit and a low temperature side refrigerant circuit each of which constitutes an independent
`
`refrigerant closed circuit which evaporates refrigerant discharged from the compressor and
`
`exerts a cooling action, and the low temperature side refrigerant circuit Side refrigerant circuit
`
`includes a compressor, a condenser, an evaporator, a plurality of intermediate heat exchangers
`
`connected in series so that a return refrigerant from the evaporator flows, and a plurality of
`
`pressure reducing devices, A non—azeotropic mixed refrigerant is enclosed in the condenser, and
`
`the condensed refrigerant in the refrigerant passed through the condenser is merged into the
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`intermediate heat exchanger via the decompressor, and the uncondensed refrigerant in the
`
`refrigerant is cooled in the intermediate heat exchanger , The low boiling point refrigerant is
`
`condensed in order and the lowest boiling point refrigerant is caused to flow into the evaporator
`
`via the final stage decompressor while the evaporator of the high, temperature side refrigerant
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`circuit and the condenser of the low temperature side refrigerant circuit perform cascade heat
`
`Constitutes an exchanger, and the low temperature side refrigerant circuit A machine room
`
`which is formed by cooling the storage compartment constituted in the heat insulation box by an
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`evaporator to an extremely low temperature and which is constituted on the side of the
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`insulation box body and in which each compressor is installed and a machine room A heat
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`insulating structure which is formed to extend in the front-rear direction on the side wall of the
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`heat insulating box body located at the rear side of the cabinet, has an opening opening
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`rearward, and a heat insulating structure surrounding the periphery of the cascade heat
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`exchanger and each intermediate heat exchanger with a heat insulating material Wherein the
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`cascade heat exchanger is disposed at one end of the heat insulating structure and the piping
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`connecting the equipment in the heat insulation structure and the equipment outside the heat
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`insulation structure is disposed on the side on which the cascade heat exchanger is disposed and
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`the side on which the cascade heat exchanger is disposed And the heat insulating structure is
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`inserted into the opening so as to be insertable and removable from the side where the cascade
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`heat exchanger is disposed so that the heat insulating structure is installed in the machine room
`of the heat insulating box Side walls of the first electrode.
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`[0015]
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`According to a second aspect of the present invention, in the refrigeration apparatus of the
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`second aspect, a cutout is formed in a rear portion of a side wall of the heat insulating box body
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`corresponding to the opening on the machine room side.
`
`[0016]
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`In the refrigerating apparatus according to the third aspect of the present invention, in each of
`
`the above inventions, the heat insulating box body is formed by a composite configuration of a
`
`vacuum heat insulating panel and a foam heat insulating material, and the vacuum heat
`
`insulating panel is attached to the front and rear walls of the heat insulating box body and the
`
`machine And is disposed in a side wall opposite to the chamber.
`
`[0017]
`
`According to the present invention, there is provided a high—temperature side refrigerant circuit
`
`and a low-temperature side refrigerant circuit which constitute an independent refrigerant closed
`
`circuit which condenses the refrigerant discharged from the compressor and then evaporates and
`
`exerts a cooling action, and the low temperature side refrigerant circuit The refrigerant circuit
`
`includes a compressor, a condenser, an evaporator, a plurality of intermediate heat exchangers
`
`connected in series so that the. return refrigerant from the evaporator flows, and a plurality of
`
`pressure reducing devices, and is constituted of a plurality of types of refrigerant A non—
`
`azeotropic mixed refrigerant is enclosed in the intermediate heat exchanger, the condensed
`
`refrigerant in the refrigerant having passed through, the condenser is merged into the
`
`intermediate heat exchanger via the decompressor, and the uncondensed refrigerant in the
`
`refrigerant is cooled by the intermediate heat exchanger, The lowest boiling point refrigerant is
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`condensed in order and the lowest boiling point refrigerant is caused to flow into the evaporator
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`via the final stage decompressor while the evaporator of the high temperature side refrigerant
`
`circuit and the condenser of the low temperature side refrigerant circuit perform cascade heat
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`exchange , And the low temperature side refrigerant circuit steam A cryogenic heat exchanger
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`and a cabinet heat exchanger which are constituted on the side of the heat insulating box and in
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`which the respective compressors are installed are provided, Since the heat insulating structure
`
`surrounding each intermediate heat exchanger with a heat insulating material is disposed on the
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`side wall on the side of the machine room of the insulating box body, it is possible to prevent the
`
`cascade heat exchanger and each of the intermediate heat exchangers It is possible to reduce the
`
`depth dimension of the entire apparatus as compared with the case where the heat insulating
`
`structure surrounded by a heat insulating material is installed on the back side of the heat
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`insulating box.
`
`[0018]
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`This makes it possible to avoid the inconvenience of being caught by the cabinet heat exchanger
`
`and the respective heat exchangers due to the presence of the overhanging portion of the heat
`
`insulating structure surrounding the periphery of the cascade heat exchanger and the respective
`
`intermediate heat exchangers, It is possible to easily carry out the loading / unloading of the
`
`refrigerating machine without particularly reducing the size of the refrigerating machine. Also,
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`even at the installation site, since the heat insulating structure surrounding the cascade heat
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`exchanger and each intermediate heat exchanger does not project outward from the back
`
`surface, it is necessary to narrow the area required for installation Is possible.
`
`[0019]
`
`in particular, an opening is formed in the side wall of the heat insulating box body located on the
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`machine room side in the front-rear direction to form an opening opening rearwardly, and the
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`cascade heat exchanger is disposed at one end of the heat insulating structure, A pipe connecting
`
`the equipment in the body and the equipment outside the heat insulation structure is disposed so
`
`as to face the one side end face on the side opposite to the side where the cascade heat
`
`exchanger is disposed and the heat insulation structure is cascade heat exchange The cascade
`
`heat exchanger and each of the intermediate heat exchangers can be easily incorporated into the
`
`main body and the assembling workability is improved because the cascade heat exchanger and
`
`each intermediate heat exchanger can be easily inserted into the opening from the side where the
`
`vessel is disposed . in addition, the integrated heat insulating structure can be detached from the
`
`main body by pulling it backward, so that the maintenance work of the cascade heat exchanger
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`and the intermediate heat exchanger can be easily performed.
`
`[0020]
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`Further, since the piping from inside the heat insulating structure faces the rear surface on which
`
`the heat insulating structure is inserted and removed, after placing each compressor in the
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`machine room, the heat insulating structure is finally inserted, It becomes possible to easily
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`connect with the pipe from the machine room side or the heat insulating box side in this state,
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`thereby also making it possible to improve piping workability and assembling workability. in this
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`case as well, if the notch is formed in the rear part of the side wall of the insulation box body side
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`corresponding to the opening as in the invention of claim 2, the maintenance work and assembly
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`workability are further improved.
`
`[0021]
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`Accord.ng to a third aspect of the present invention, in each of the above inventions, the heat
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`insulating box body is formed by a composite structure of a vacuum heat insulating panel and a
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`foam heat insulating material, and the vacuum heat insulating panel is divided into front and rear
`
`walls of the heat insulating box, The cascade heat exchanger and the heat insulating structure for
`
`surrounding the peripheries of the respective intermediate heat exchangers are not provided on
`
`the back surface of the heat insulating box body as in the conventional case , It is possible to
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`dispose the vacuum insulation panel in the front and rear walls of the insulation box and the side
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`wall opposite to the machine room without being affected by the heat insulation structure and
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`reduce the amount of cold heat leaked in the storage compartment And it is possible to suppress
`
`wasteful consumption of cooling energy.
`
`[0022]
`
`In particular, by disposing vacuum insulation panels in the front and rear walls of the heat
`
`insulating box body facing the exterior and the side walls on the side opposite to the machine
`
`room, it is possible to keep the inside of the storage compartment at an extremely low
`
`temperature such as -80 a C. or less , it is possible to improve the heat insulating performance
`
`of the heat insulating box itself and it is possible to reduce the size and even if the external
`
`dimensions are the same as in the prior art, the expansion of the storage capacity in the storage
`
`compartment it is possible to draw Alternatively, even if the storage capacity is the same as in
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`the conventional case, it is possible to reduce the external size, which also makes it possible to
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`narrow the area required for installing the refrigeration apparatus.
`
`[0023]
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`Hereinafter, embodiments of the present invention will be described in detail with reference to
`
`the drawings. 2 is a front view of the refrigerating apparatus 1, FIG. 3 is a plan view of the
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`refrigerating apparatus 1, FIG. 4 is a perspective view of the storage chamber 4 of the
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`refrigerating apparatus 1 And FIG. 5 is a perspective view of the refrigerating apparatus 1 in a
`
`state in which the top panel 5 is opened. The refrigerating apparatus 1 of the present
`
`embodiment is suitable for ultra low temperature preservation of, for example, a living body
`
`tissue or a specimen for long-term low temperature storage, and has a heat insulating box body 2
`
`opening on the upper surface and a heat insulating box body 2 positioned on the side of the heat
`
`insulating box body 2 And a machine room 3 in which a compressor 10 and the like are installed,
`
`and the main body is constituted.
`
`[0024]
`
`The insulating box body 2 includes an outer box 6 made of a steel plate having an opened. top
`
`surface, an inner box 7 made of metal such as aluminum having high thermal conductivity, a
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`synthetic resin connecting upper ends of the two boxes 6 And a heat insulating material 9 made
`
`of polyurethane resin filled in the space surrounded by the outer box 6, the inner box 7 and the
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`breaker 8 by the in-situ foaming method, and the inner box 7 So that the inside of the storage
`
`room 4 is opened.
`
`[0025]
`
`in this embodiment, the target internal temperature of the storage compartment; 4 (hereinafter
`
`referred to as internal temperature). ) Is set to, for example, 450 ° C. or less, the heat insulating
`
`box body 2 that demarcates the inside of the storage chamber 4 and the outside air needs a
`
`larger heat insulating capability than the low temperature at which the internal temperature is
`
`set to around 0 ° C.
`
`. Therefore, in order to secure the heat insulating capability by only the heat
`
`insulating material 9 made of the polyurethane resin as described above, it is necessary to form, it
`
`extremely thick, and with a limited body size, the storage amount in the storage chamber 4 is
`sufficient It can not be secured in this case.
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`[0026]
`
`Therefore, in the insulating box body 2 of this embodiment, vacuum insulation made of glass
`
`wool is applied to each inner wall surface of the side wall 6C located on the side opposite to the
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`side where the front wall 6A, the rear wall SB and the machine room 3 of the outer box 6 are
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`provided Once the panel 12 is placed and temporarily fixed with a double-sided adhesive tape,
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`the heat insulating material 9 is filled between these boxes 6 and 7 by the in-situ foaming
`method.
`
`[0027]
`
`The vacuum heat insulating panel 12 stores glass wool having heat insulating property in a
`
`container constituted by a multilayer film made of aluminum, synthetic resin or the like having
`
`no air permeability. Thereafter, the air in the container is discharged by a predetermined vacuum
`
`exhaust means, and the opening portion of the container is joined by thermal welding. Therefore,
`
`the vacuum insulation panel 12 can obtain the same heat insulating effect while reducing the
`
`thickness dimension of the heat insulating material 9 as compared with the conventional one due
`
`to the heat insulating performance.
`
`[0028}
`
`On the other hand, an evaporator (evaporating pipe) 62 constituting a refrigerant circuit of the
`
`cooling device R, which will be described in detail later, is mounted in a heat-insulating manner
`
`on the peripheral surface of the inner box 7 on the side of the heat insulating material 9.
`
`[0029]
`
`As shown in FIGS. 2 and 4-, the upper surface of the breaker 8 of the insulating box body 2
`
`configured as described above is formed in a staircase shape, and the heat insulating door 13 is
`
`connected at one end thereof via a packing (not shown) _. in the present embodiment, it is
`
`rotatably provided by the pivot members 14, 14 around the rear end. Further, an inner lid 15
`
`made of a heat insulating material is provided so as to be freely opened and closed on the upper
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`opening of the storage chamber 4. Further, a pressing portion configured to protrude downward
`
`is formed on the lower surface of the heat insulating door 13, whereby the pressing portion of
`
`the heat insulating door 13 presses the inner lid 15, whereby the upper surface of the storage
`
`chamber 4 The opening is closed so as to freely open and close. A handle portion 16 is provided
`
`at the other end of the heat insulating door 13, that is, in the front end in the present
`
`embodiment, and by operating the handle portion 16, the heat: insulating door 13 is opened and
`closed.
`
`[0030]
`
`On the other hand, a machine room 3 is provided on the side of the insulating box body 2 by a
`
`side panel 313 constituting a side surface on the opposite side to the side on which the front panel
`
`3A, a not-shown rear panel and a heat insulating box body 2 are provided . The machine room 3
`
`in this embodiment is provided with a partition plate 17 that partitions the inside into upper and
`
`lower parts. Compressors 10, 20 and the like constituting the cooling device R as described
`
`above are accommodated and installed below the partition plate 17 , and the front panel 3 </ b>
`
`A and the side panel 3 </ b> B positioned below the partition plate 17 are provided with
`ventilation A slit 3C is formed.
`
`[0031]
`
`Above the partition plate 17, an upper machine room 18 whose upper face is opened is formed.
`
`in the top opening of the upper machine room 18, a top panel 5 is provided so as to be rotatable
`
`about one end, in this embodiment around the rear end, so that the upper machine room 18 can
`
`be opened and closed freely . A panel provided on the front surface of the upper machine room
`
`18 is an operation panel 21 for operating the refrigerating apparatus 1.
`
`[0032]
`
`A measurement hole 19 is formed on the side surface of the upper machine room 18 on the side
`
`of the insulating box body 2. The measuring hole 19 penetrates the outer box 6, the heat
`
`insulating material 9, and the inner box 7 constituting the heat insulating box body 2 so as to
`
`communicate with the storage chamber 4 formed in the adjacent heat insulating box body 2 For
`
`example. The measurement hole 19 is capable of inserting a temperature sensor into the storage
`
`chamber 4 from the outside, and the wiring drawn out from the temperature sensor is connected
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`to the external recording apparatus main body via the measurement hole 19. The measuring hole
`
`19 is closed by a plug 19 </ b> A formed of a special material having a sponge-like deformable
`
`property and heat insulating property. in a state where the temperature sensor is not attached,
`
`the measurement hole 19 is adiabatically closed by the plug 19 </ b> A.
`
`[0033]
`
`Thereby, when using a device for measuring, recording, and the like in the storage chamber 4,
`
`the top panel 5 provided in the machine room 3 is opened and the heat insulating box 2 located
`
`in the upper machine room 18 It is possible to insert the measuring instrument into the storage
`
`chamber 4 through the measuring hole 19 formed in the side surface on the side opposite to the
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`measuring side. Therefore, it is easy to install the measuring instrument in the storage
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`compartment 4 which has been cooled to a predetermined. ultra—low temperature.
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`[0034]
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`In particular, since the measurement hole 19 in this embodiment is formed on the side surface of
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`the heat insulating box 2 on the side of the machine room 18, unlike the measurement hole
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`provided in the conventional freezing device, It is unnecessary to have the interval necessary to
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`use the measurement hole 19 in particular even in the case where it is installed adjacent to the
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`wail of the installation environment or other equipment. This makes it possible to narrow the
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`area required for installing the refrigerating apparatus 1, which is suitable for layout in a
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`laboratory or the like.
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`[0035]
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`Further, since the measuring hole 19 is formed on the wall surface of the insulating box body 2
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`on the side adjacent to the machine room 3, the side surface other than the side adjacent to the
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`machine room 3, that is the heat insulating box The vacuum insulation panel 12 as described
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`above can be disposed on the front and rear walls and the side face of the body 2 without
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`affecting the formation position of the measurement hole 19.
`
`[0036]
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`04—10—2017
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`12
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`

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`Further, on the wall surface of the heat insulating box body 2 on which the measuring hole 19 is
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`formed, a heat insulating structure 70 in which the cascade heat exchanger 43, the respective
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`intermediate heat exchangers 48, and the like are formed integrally with a heat insulating
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`material The heat insulating structure 70 makes it possible to effectively insulate the interior of
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`the storage chamber 4 even if the vacuum heat. insulating panel 12 is not provided.
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`[0037]
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`Thereby, it is possible to reduce the leakage amount of cold heat in the storage chamber 4, and it
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`is possible to suppress wasteful cooling energy waste.
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`[0038]
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`Therefore, even when the interior of the storage chamber 4 is set to an ultra-low temperature of,
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`for example, -150 ° C. or less as in this embodiment, the heat insulating performance of the
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`insulating box body 2 itself can be improved, and the dimension of the heat insulating wall And it
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`is possible to enlarge the storage volume in the storage compartment 4 even with the same outer
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`dimensions as in the conventional. case. Alternatively, even if the storage capacity is the same as
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`in the conventional case, it is possible to reduce the external size, which also makes it possible to
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`narrow the area required for installing the refrigerating apparatus 1,
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`[0039]
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`Furthermore, since the measuring hole 19 in this embodiment can be concealed by the top panel
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`5 capable of opening and closing the top opening of the upper machine room 18, it is preferable
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`that the measuring hole 19 is not exposed to the external appearance And it is possible to
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`improve the appearance. in addition, by opening the top panel 5, it is possible to easily operate
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`the measurement hole 19, and it is possible to improve workability. in addition,