JP2009186087A - Air cycle refrigeration unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air cycle refrigeration unit capable of improving temperature efficiency of constituting apparatuses of the refrigeration unit by preventing one refrigeration unit constituting apparatus from being affected by temperature of another refrigeration unit constituting apparatus with the temperature different from the former's. <P>SOLUTION: The refrigeration unit constituting apparatuses, including a compressor turbine unit, heat exchangers 10, 11, auxiliary machines, and a controller 20, are classified into a plurality of temperature sections according to the temperatures of the respective refrigeration unit constituting apparatuses. The inside of the air cycle refrigeration unit 1 is partitioned by partition walls 25, 26 into installation spaces by temperature sections 22, 23, 24 of the number of the temperature sections. The respective refrigeration unit constituting apparatuses are arranged in the installation spaces for every temperature section to which the temperature sections correspond. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air cycle refrigeration unit in which air is used as a refrigerant and is used in a refrigeration warehouse, a low-temperature room below zero degrees, air conditioning, and the like.

An air cycle refrigeration unit that uses air as a refrigerant has been proposed (see, for example, Patent Document 1). Some air cycle refrigeration units for containers have a front plate that covers the entire opening side, a fan that exhausts heat inside the unit is disposed, and an outside air inflow portion is provided.
Japanese Patent No. 2623202

  If you have a front plate that covers the entire opening side and arranges a fan that exhausts heat in the unit, because the heat radiation heat exchange high temperature side input part that exchanges heat between the compressor output and the outside air is arranged in the unit, There was a problem that the temperature inside the unit rose and the temperature efficiency of the regenerative heat exchanger was lowered.

An object of the present invention is to provide an air cycle refrigeration unit in which the refrigeration unit component device is not affected by the temperature of other refrigeration unit component devices having different temperatures, and the temperature efficiency of the refrigeration unit component device can be improved. It is.
Another object of the present invention is to provide an air cycle refrigeration unit in which the regenerative heat exchanger of the refrigeration unit constituent devices is not affected by the high temperature part and the temperature efficiency of the regenerative heat exchanger can be improved. Is to provide.

In the air cycle refrigeration unit of the present invention, the compressor wheel and the turbine wheel are attached to a common main shaft, and the main shaft is supported by a motor-integrated magnetic bearing device having a rolling bearing, a magnetic bearing, and a motor for driving the main shaft. Compressor / turbine unit, a plurality of or one heat exchanger interposed in the refrigerant path passing through the compressor and expansion turbine of the compressor / turbine unit, auxiliary equipment, and a controller for controlling the compressor / turbine unit. In an air cycle refrigeration unit for air conditioning or refrigeration,
The refrigeration unit components including the compressor / turbine unit, heat exchanger, auxiliary equipment, and controller are classified into a plurality of temperature categories according to the temperatures of the respective refrigeration unit components, and the air cycle refrigeration unit has a partition wall. In this manner, the refrigeration unit constituent devices are arranged in the temperature-division installation space corresponding to the temperature division.
The auxiliary machines are refrigeration unit components other than the compressor / turbine unit and the heat exchanger, and are devices that assist the compressor / turbine unit and the heat exchanger, for example, a blower for a heat exchanger, It includes at least one of an oil circulation pump and an oil cooling fan.

  According to this configuration, the refrigeration unit constituent devices are classified into a plurality of temperature sections, the inside of the air cycle refrigeration unit is divided into installation spaces for each temperature section by the partition wall, and each refrigeration unit constituent device is divided. Because the temperature section is arranged in the installation space classified by the corresponding temperature classification, the refrigeration unit constituting equipment arranged in the predetermined temperature classification installation space, for example, a heat exchanger such as a regenerative heat exchanger, The temperature efficiency of the heat exchanger is improved without being affected by the refrigeration unit constituent devices arranged in the temperature-specific installation space of the high temperature part.

  The temperature division installation space may be divided into three temperature division installation spaces of a high temperature portion, a normal temperature portion, and a low temperature portion. In this case, the installation space for each temperature classification in the high temperature part and the installation space for each temperature classification in the low temperature part can be separated via the normal temperature part. Therefore, it is possible to further improve the temperature efficiency of the refrigeration unit constituting device arranged in the installation space for each temperature division in the low temperature part, for example, a heat exchanger such as a regenerative heat exchanger.

The heat exchanger includes a regenerative heat exchanger used for air cooling at the latter stage in the refrigerant path, the regenerative heat exchanger disposed upstream of the expansion turbine in the refrigerant path. You may arrange | position in the installation space classified by the temperature division of the said low-temperature part.
In this case, the regenerative heat exchanger placed in the installation space for each temperature division in the low temperature section is not affected by the refrigeration unit components such as the heat radiation heat exchanger placed in the installation space for each temperature division in the high sound section, It is possible to reliably improve the temperature efficiency of the regenerative heat exchanger arranged in the installation space for each temperature section. As a result, the regenerative heat exchanger and the compressor / turbine unit can be reduced in size, and the manufacturing cost can be reduced.

  The heat exchanger has a heat dissipating heat exchanger that is disposed downstream of the compressor in the refrigerant path and cools air compressed by the compressor, and the heat dissipating heat exchanger is disposed in the installation space for each temperature section of the high temperature section. You may do it. In this case, it is possible to prevent the temperature inside the unit from rising as a whole, and to increase the temperature efficiency of the refrigeration unit constituent devices arranged in the temperature division-specific installation space in the low temperature part.

  You may seal the installation space classified by temperature division of the said low-temperature part. Sealing the space can be maintained by laying a heat insulating material along the inner wall of the temperature section-specific installation space in the low-temperature part, or by providing a seal in the gap between the through holes through which the pipes pass. Thereby, it can prevent that the temperature rise of the refrigeration unit component apparatus arrange | positioned in the installation space classified by temperature division of a low-temperature part undesirably.

The installation space for each temperature division in the high temperature part may be open to the atmosphere. The air used for cooling the refrigeration unit components installed in the temperature-specific installation space of the high-temperature part can be smoothly discharged from a hole or the like for opening to the atmosphere.
As the auxiliary equipment, there is a fan that sends a cooling medium to the heat exchanger, and the fan is arranged in the installation space for each temperature division of the normal temperature section, and the air suction port in the installation space for the temperature division of the normal temperature section May be provided. The fan can be driven to rotate, air can be supplied from the air suction port, and the cooling medium can be sent to the heat exchanger. In this state, the installation space for each temperature division in the normal temperature part can be maintained at a substantially constant temperature.

In the air cycle refrigeration unit of the present invention, the compressor wheel and the turbine wheel are attached to a common main shaft, and the main shaft is supported by a motor-integrated magnetic bearing device having a rolling bearing, a magnetic bearing, and a motor for driving the main shaft. Compressor / turbine unit, a plurality of or one heat exchanger interposed in the refrigerant path passing through the compressor and expansion turbine of the compressor / turbine unit, auxiliary equipment, and a controller for controlling the compressor / turbine unit. In an air cycle refrigeration unit for air conditioning or refrigeration,
The refrigeration unit components including the compressor / turbine unit, heat exchanger, auxiliary equipment, and controller are classified into a plurality of temperature categories according to the temperatures of the respective refrigeration unit components, and the air cycle refrigeration unit has a partition wall. Since the refrigeration unit constituent devices are arranged in the temperature division installation space corresponding to the temperature category, the refrigeration unit component devices are arranged in other refrigeration units having different temperatures. It is possible to improve the temperature efficiency of the refrigeration unit constituent devices without being affected by the temperature of the unit constituent devices.

An embodiment of the present invention will be described with reference to FIGS.
An air cycle refrigeration unit 1 according to an embodiment of the present invention is a device that directly cools air in a cooled portion 2 such as a container freezer as a refrigerant, and the entire unit is sealed by a front plate 4 at a corner of the container 3. Has been stored. The air cycle refrigeration unit 1 has a refrigerant path 7 extending from an air intake 5 to a discharge 6, each opening in the cooled portion 2. In the refrigerant path 7, for example, a compressor 9 of the compressor / turbine unit 8, a heat dissipation heat exchanger 10, a regenerative heat exchanger 11, and an expansion turbine 12 of the compressor / turbine unit 8 are sequentially provided.

  The compressor / turbine unit 8 includes a motor-integrated magnetic bearing device. In the motor-integrated magnetic bearing device, an oil flow path 13 for cooling a motor, a pump 14 for circulating oil, a heat exchanger 15 for cooling oil, and a fan 16 etc. As shown in FIG. 4, in the motor-integrated magnetic bearing device, the main shaft 17 is supported by a plurality of rolling bearings B1 and B2 in the radial direction, and either or both of the axial load and the bearing preload applied to the main shaft 17 are supported. These are provided with a motor M1 that is supported by an electromagnet 18 and a permanent magnet 19 that are magnetic bearings, and that rotationally drives the main shaft 17, respectively. The compressor / turbine unit 8 controls, for example, a sensor S1 for detecting an axial load acting on the main shaft 17 by air in the compressor 9 and the expansion turbine 12, and a bearing force by the electromagnet 18 according to the output of the sensor S1. Controller 20. The bearing force by the electromagnet 18 is controlled by the magnetic bearing controller 20B provided in the controller 20 in accordance with the output of the sensor S1. However, the control target of the controller 20 is not necessarily limited only to the bearing force by the electromagnet 18.

  As shown in FIG. 4, the compressor 9 has a housing 9b facing the compressor impeller 9a through a minute gap, and the air sucked in the axial direction from the suction port 9c in the center is received by the compressor impeller 9a. It compresses and discharges as shown by the arrow 9d from the exit (not shown) of an outer peripheral part. The expansion turbine 12 has a turbine housing 12b that is opposed to the turbine impeller 12a via a minute gap, and the air sucked from the outer peripheral portion as indicated by an arrow 12c is adiabatically expanded by the turbine impeller 12a, and the center portion Is discharged in the axial direction from the discharge port 12d.

  In the compressor / turbine unit 8, the main shaft 17 is supported by a plurality of bearings B 1 and B 2 in the radial direction, and the thrust force applied to the main shaft 17 is supported by an electromagnet 18. The electromagnet 18 is installed in the spindle housing SH so as to face the both surfaces or one surface of a flange-shaped thrust plate 17a made of a ferromagnetic material provided on the main shaft 17 without contact. The compressor / turbine unit 8 is provided with a motor M1 for driving the main shaft 17 to rotate. The motor M1 is provided side by side with the electromagnet 18, and includes a stator Ma provided on the spindle housing SH and a rotor Mb provided on the main shaft 17. The stator Ma has a stator coil Maa, and the rotor Mb is made of a magnet or the like. The motor M1 is controlled by the motor controller 20M of the controller 20.

  The bearings B1 and B2 that support the main shaft 17 are rolling bearings and have a function of restricting the position in the axial direction. For example, a deep groove ball bearing is used. In the case of a deep groove ball bearing, it has a thrust support function in both directions, and has the effect of returning the axial position of the inner and outer rings to the neutral position. These two bearings B1, B2 are arranged in the vicinity of the compressor wheel 9a and the turbine wheel 12a in the spindle housing SH, respectively. The bearing B2 is fitted in a bearing housing fitted in the spindle housing SH.

The main shaft 17 is a stepped shaft having a large-diameter portion 17b at the center and small-diameter portions 17c at both ends. The inner rings of the bearings B1 and B2 on both sides are fitted into the small diameter portion 17c in a press-fit state, and one width surface is engaged with the step surface between the large diameter portion 17b and the small diameter portion 17c.
The portions of the spindle housing SH closer to the respective impellers 9a and 12a than the bearings B1 and B2 on both sides are formed with inner diameters close to the main shaft 17, and non-contact seals SL1 and SL2 are formed on the inner diameter surfaces. Yes. The non-contact seals SL1 and SL2 are labyrinth seals formed by arranging a plurality of circumferential grooves in the axial direction on the inner diameter surface of the spindle housing SH.

  The oil circulation pump 14, the fan 16, and the blower 21 for the heat dissipation heat exchanger 10 correspond to auxiliary machinery.

A plurality of refrigeration unit components including the compressor / turbine unit 8, the radiant heat exchanger 10, the regenerative heat exchanger 11, the auxiliary devices, and the controller 20, depending on the temperatures of these refrigeration unit components (3 in this example). )).
The temperature division-specific installation spaces 22, 23, and 24 are classified according to the temperatures reached by the components of the refrigeration unit during the refrigeration cycle operation. The low temperature inlet side of the regenerative heat exchanger 11 that exchanges heat with air at a temperature close to room temperature in the freezer has a temperature close to −30 ° C., which is the temperature in the freezer, and is therefore divided into low temperature sections. Further, since the high temperature side inlet temperature of the heat-dissipating heat exchanger 10 that exchanges heat between the compressor output and normal temperature air is about 80 ° C. or higher and 120 ° C. or lower, it is divided into high temperature sections. The place where the oil circulation pump 14, the fan 16, the blower 21 for the heat-dissipating heat exchanger 10, the compressor / turbine unit 8 and the controller 20 are located close to the outside temperature. It was divided into.
The inside of the air cycle refrigeration unit 1 is divided into three temperature division installation spaces by partition walls 25 and 26, and the respective refrigeration unit components are arranged in the temperature division installation space corresponding to the temperature division. .
That is, two partition walls 25 and 26 that divide the inside of the air cycle refrigeration unit 1 into three temperature division installation spaces 22, 23, and 24 of a high temperature portion, a normal temperature portion, and a low temperature portion are provided. These partition walls 25 and 26 are disposed substantially parallel to the placement surface S of the container. However, the partition walls 25 and 26 may not be arranged “substantially parallel” to the placement surface S of the container. The temperature division-specific installation space 22 of the high temperature part is located at the lowest stage in the air cycle refrigeration unit 1. The heat-dissipating heat exchanger 10 is accommodated in the temperature-division-specific installation space 22 of the high-temperature portion, and the vicinity of the high-temperature side inlet of the heat-dissipating heat exchanger 10 is about 80 ° C. or higher and 120 ° C. or lower. An exhaust port 22a for opening to the atmosphere is formed in one side wall portion of the temperature-specific installation space 22, and the air introduced from the low temperature side inlet of the heat dissipation heat exchanger 10 is introduced from the high temperature side inlet. It exchanges heat with air, and is discharged to the atmosphere from the outlet on the high temperature side through the exhaust port 22a for opening to the atmosphere.

In the air cycle refrigeration unit 1, in the middle stage, that is, immediately above the temperature division installation space 22 in the high temperature section, the room temperature section installation space 23 in the normal temperature section is arranged via the partition wall 25. The auxiliary machines, the compressor / turbine unit 8, and the controller 20 are accommodated in the temperature-specific installation space 23. In addition, an air suction port 23a of the fan 16 among the auxiliary machines is formed in one side wall portion of the temperature division-specific installation space 23 in the normal temperature portion.
In addition, in the installation space 23 for each temperature section, an intake port and an exhaust port are formed to discharge heat from the power section of the controller 20 and heat from the drive motor of the auxiliary equipment to the outside of the unit. The exhaust performed through the intake port and the exhaust port may be exhausted by natural convection or positively performed by disposing a fan at the exhaust port.
Auxiliaries and spindles in the temperature division-specific installation space 23 in the normal temperature section and the heat-dissipating heat exchanger 10 in the temperature division-specific installation space 22 in the high temperature section are connected by piping.
The air output from the compressor of the compressor / turbine unit 8 is connected to the high temperature side inlet of the heat exchanger 10 for radiating heat disposed in the temperature-specific installation space 22 of the high-temperature section, and enters the temperature-specific installation space 22. The low-temperature-side outlet of the heat-dissipating heat exchanger 10 is connected to a pipe line that cools the motor part of the compressor / turbine unit 8 disposed in the temperature-division-specific installation space 23 of the normal-temperature part, and the heat-dissipating heat exchange The low temperature side inlet of the vessel 10 is connected to the blower 21 disposed in the temperature division-specific installation space 23 in the normal temperature part, and passes through the temperature division-specific installation space 22 and the temperature division-specific installation space 23 in the vertical direction. And the through-hole 25a which penetrates the partition 25 is formed, and each piping is passed and piping connection is carried out.
There is a temperature gradient in the temperature division-specific installation space 22 of the high-temperature section, and the temperature division installation space 22 in the temperature division, for example, near a temperature of about 20 ° C. and the temperature division-specific installation space 23 of the normal temperature section are vertically penetrated. A through-hole 25a is formed which penetrates the partition wall 25a. Pipings are passed through the through-hole 25a, and the heat exchanger 10 for heat dissipation is connected by piping.

In the air cycle refrigeration unit 1, in the upper stage, that is, immediately above the temperature-specific installation space 23 in the normal temperature part, the temperature-specific installation space 24 in the low temperature part is arranged via the partition wall 26. The regenerative heat exchanger 11 is housed in the temperature division-specific installation space 24, and the vicinity of the low temperature side inlet of the regenerative heat exchanger 11 is close to −30 ° C. which is the temperature in the freezer. The regenerative heat exchanger 11 in the temperature division-specific installation space 24 in the low-temperature section and the auxiliary equipment and spindle in the temperature division-specific installation space 23 in the normal temperature section are connected by piping.
The air that has cooled the motor section of the compressor / turbine unit 8 disposed in the temperature section-specific installation space 23 of the normal temperature section is the high temperature side inlet of the regenerative heat exchanger 11 disposed in the temperature section-specific installation space 24 of the low temperature section. And the low temperature side outlet of the regenerative heat exchanger 11 is connected to the turbine input section of the compressor / turbine unit 8, and the high temperature side outlet of the regenerative heat exchanger 11 is the compressor input of the compressor / turbine unit 8. Is a through hole 26 a that is connected to a part and penetrates through a part of the temperature-space-specific installation space 24 in the low-temperature part and a part of the room-temperature-specific installation space 23 in the vertical direction. A hole 26a is formed. Pipings are passed through the through hole 26a, and the regenerative heat exchanger 11 is connected by piping.
The temperature section-specific installation space 24 in the low temperature part is formed by laying a heat insulating material 27 along the inner wall, and a seal 28 is provided in a gap between the pipes and the through hole 26a to be sealed.

FIG. 5 is a system diagram of this air cycle refrigeration unit.
Air flows from the outlet of the cooled portion 2 into the intake 5 of the refrigerant path 7. The air flowing into the intake port 5 is used for cooling the air in the refrigerant path 7 by the regenerative heat exchanger 11 and is heated. This air is compressed by the compressor 9 a of the compressor / turbine unit 8, and is cooled by the heat-dissipating heat exchanger 10 while being heated by the compression. The cooled air is cooled by the regenerative heat exchanger 11, then adiabatically expanded by the expansion turbine 12 of the compressor / turbine unit 8, cooled, and discharged from the discharge port 6 to the inlet of the cooled portion 2.

According to the air cycle refrigeration unit 1 described above, the refrigeration unit constituent devices are classified into three temperature categories according to the temperatures of the respective refrigeration unit constituent devices. Since the refrigeration unit constituent devices are arranged in the temperature division-specific installation spaces corresponding to the temperature divisions, the regenerative heat exchanger 11 is installed in the high-temperature section 22. The heat dissipation heat exchanger 10 is not affected, and the temperature efficiency of the regenerative heat exchanger 11 is improved. Thereby, size reduction of the regenerative heat exchanger 11, the turbine unit 8, etc. can be achieved, and size reduction of the whole air cycle refrigeration unit 1 can be achieved. In addition, since the installation space 23 for each temperature division in the normal temperature section is interposed between the installation space 22 for each temperature classification in the high temperature section and the installation space 24 for each temperature classification in the low temperature section, in the installation space 24 for each temperature classification in the low temperature section. The regenerative heat exchanger 11 can further reduce the influence of the heat dissipating heat exchanger 10 in the installation space 22 for each temperature section in the high temperature part.
Therefore, the manufacturing cost of the air cycle refrigeration unit 1 can be reduced, and the loading capacity of the container can be increased. With the downsizing of the entire air cycle refrigeration unit 1, versatility for containers can be improved.

The temperature division-specific installation space 24 in the low-temperature part is formed by laying a heat insulating material 27, and is sealed by providing a seal 28 in a gap between the piping and the through hole 26a. Thus, the heat insulation of the regenerative heat exchanger 11 housed in the temperature division-specific installation space 24 in the low temperature part can be improved, and the temperature efficiency of the regenerative heat exchanger 11 can be improved.
The high-temperature section-specific installation space 22 is opened to the atmosphere, and the air introduced into the cooling channel 10a of the heat-dissipation heat exchanger 10 by the blower 21 and this drive motor is supplied to the high-temperature section-specific temperature section installation space 22. It can be smoothly discharged from the formed hole 22a.
Since the fan 16 is arranged in the temperature division-specific installation space 23 of the room temperature portion and the air suction port 23a is provided, the fan 16 is rotated without being affected by the heat exchangers 10 and 11, and the cooling target is efficiently cooled. Can be made.

As another embodiment of the present invention, a partition wall may be provided only between the high temperature part and the normal temperature part, and no partition wall may be provided between the normal temperature part and the low temperature part. On the contrary, it is good also as a structure which provides a partition between a normal temperature part and a low temperature part, without providing a partition between a high temperature part and a normal temperature part. In these cases, although the temperature efficiency of the regenerative heat exchanger 11 is inferior to that of the present embodiment shown in FIG. 1, the temperature efficiency of the regenerative heat exchanger 11 can be improved than that of the prior art.
In this embodiment, the through holes 25a and 26a are formed in the partition walls 25 and 26, and the piping is passed through the through holes 25a and 26a. However, the present invention is not necessarily limited to this form. For example, without forming a through-hole in the partition wall, it penetrates through each side wall portion of the installation space 22 for each temperature division in the high temperature portion, the installation space 23 for each temperature division in the normal temperature portion, and the installation space 24 for each temperature division in the low temperature portion. A hole may be formed and pipe connection may be made through this through hole.

The front plate may be provided at the opening end of the container so as to be detachable or openable. In this case, the front plate can be removed or opened, and operations such as repair, inspection, and part replacement of the air cycle refrigeration unit can be easily performed.
Although the heat insulating material is laid along the inner wall of the installation space for each temperature division in the low temperature portion, the heat insulating material may be laid along the outer wall of the installation space for each temperature division of the low temperature portion. A heat insulating material may be laid on the inner wall and the outer wall. Moreover, it is also possible to provide a heat insulating material inside the wall of the installation space for each temperature division in the low temperature part.

It is the schematic which divided the inside of the air cycle refrigeration unit concerning one embodiment of this invention into the installation space according to three temperature divisions. It is a figure showing the relationship between the air cycle refrigeration unit and a container. It is a figure showing the refrigeration unit structure apparatus arrange | positioned in the installation space according to each temperature division. It is sectional drawing of the compressor * turbine unit of the same air cycle refrigeration unit. It is a systematic diagram of the same air cycle refrigeration unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air cycle refrigeration unit 7 ... Refrigerant path 8 ... Compressor turbine unit 9 ... Compressor 10 ... Heat exchanger 11 for heat radiation ... Regenerative heat exchanger 12 ... Expansion turbine 14 ... Pump 15 ... Heat exchanger 16 ... Fan 17 ... Main shaft 20 ... Controllers 22, 23, 24 ... Installation space 25, 26 by temperature classification ... Partition walls B1, B2 ... Rolling bearings

Claims (7)

A compressor / turbine unit in which a compressor impeller and a turbine impeller are attached to a common main shaft, and the main shaft is supported by a motor-integrated magnetic bearing device having a rolling bearing, a magnetic bearing, and a motor for rotating the main shaft, and the compressor An air cycle refrigeration unit that includes a plurality of or one heat exchanger interposed in the refrigerant path passing through the compressor and expansion turbine of the turbine unit, auxiliary equipment, and a controller that controls the compressor / turbine unit, and performs air conditioning or refrigeration. In
The refrigeration unit components including the compressor / turbine unit, heat exchanger, auxiliary equipment, and controller are classified into a plurality of temperature categories according to the temperatures of the respective refrigeration unit components, and the air cycle refrigeration unit has a partition wall. The air cycle refrigeration unit is characterized in that the refrigeration unit constituent devices are divided into temperature space-based installation spaces, and the refrigeration unit constituent devices are arranged in the temperature space-specific installation spaces corresponding to the temperature categories.   2. The air cycle refrigeration unit according to claim 1, wherein the temperature-division installation space is divided into three temperature-division installation spaces of a high temperature part, a normal temperature part, and a low temperature part.   The heat exchanger according to claim 2, wherein the heat exchanger includes a regenerative heat exchanger that is used for cooling air in a subsequent stage in the refrigerant path, and is disposed upstream of the expansion turbine in the refrigerant path. An air cycle refrigeration unit in which a regenerative heat exchanger is arranged in an installation space for each temperature section in the low temperature part.   4. The heat exchanger according to claim 2, further comprising: a heat dissipating heat exchanger that is disposed downstream of the compressor in the refrigerant path and that cools the air compressed by the compressor. Cycle refrigeration unit placed in the installation space for each temperature section.   The air cycle refrigeration unit according to any one of claims 2 to 4, wherein an installation space for each temperature section of the low temperature part is sealed.   The air cycle refrigeration unit according to any one of claims 2 to 5, wherein an installation space of the high-temperature part according to temperature classification is open to the atmosphere.   7. The apparatus according to claim 2, further comprising: a fan that sends a cooling medium to the heat exchanger as the auxiliary equipment, and the fan is arranged in an installation space for each temperature division in the room temperature portion. An air cycle refrigeration unit in which an air suction port is provided in the temperature-specific installation space of the room temperature section.

Images