JP2000304407A - Cold storage type cold insulating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the using efficiency of a cold storage agent and the convenience of users by measuring the time after the interruption of supply of an external power source, starting the driving control of a fan on the basis of the detection signal which has detected the interruption of supply of the external power source, and stopping the fan when the measured time has passed the time for which cold insulation is permitted. SOLUTION: When an operation is started, cold storage control for freezing a cold storage agent 12 is done at first. That is to say, a cooling device of a compressor 17 and the like is driven to perform the cold storage of the cold storage agent 12. In the case when a transfer switch is pushed down during this cold storage, a transfer is made to the cold insulation control of a storage chamber 8. When the cold storage of the cold storage agent 12 has completed, the cooling device of the compressor 17 and the like is controlled so as to maintain the cold storage condition of the cold storage agent 12. A transfer is made to cold insulation control, and a fan 15 is operated in the case when a cold insulating container 1 is driven by batteries. At this time, the time-keeping of a timer is started. When the transfer switch is pushed down during cold insulation, the fan 15 is stopped. Further, when the time measured by the timer has passed a set time, cold insulation is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold storage type cold storage box used as a container or the like which can transport articles such as fresh food while keeping it cold.

[0002]

2. Description of the Related Art Heretofore, the applicant has proposed a regenerative cold storage of this type described in Japanese Patent Application Laid-Open No. 10-103848. This regenerative cold storage box is a heat insulating cold storage body provided with a door at the front opening, a regenerator disposed at the lower portion of the refrigerating chamber, and an evaporator provided in thermal close contact with the regenerator,
Equipped with equipment such as a compressor and a condenser that constitutes a cooling device connected to the evaporator, a blower that is arranged in the refrigerator and circulates cool air by a regenerator, and a battery that is used during transportation without power supply I have. In addition, an operation panel that displays the temperature in the refrigerator, various operating states, and the like and has various switches is attached to the upper front part of the cool storage cabinet.

In this regenerative cold storage, the evaporator is cooled by driving a compressor or the like, whereby the regenerator is cooled to a predetermined temperature (for example, about -36 ° C.) and frozen. At this time, usually, the inside of the refrigerator is not actively cooled without driving the blower. However, even if the inside of the refrigerator is cooled to a predetermined temperature (for example, about −22 ° C.) by driving and controlling the blower according to a user's instruction. Good. After the cool storage agent reaches the predetermined temperature, the cooling device is controlled so as to keep the cool storage agent frozen. At the same time, the blower is driven and controlled so that the inside of the refrigerator is maintained at the predetermined temperature (cooling) so that the user can use the cool storage refrigerator at any time. Here, while the inside of the refrigerator is being kept cold, the fact that the refrigerator is currently in the cold storage operation and the temperature inside the refrigerator are displayed on the operation panel.

When a user uses a regenerative refrigerator in a place where power is not supplied, the power plug is first removed. As a result, in the regenerative refrigerator, the operation of the cooling device such as the compressor is stopped. At the same time, the blower is driven and controlled by using the battery to keep the inside of the refrigerator cooled to the predetermined temperature (cooling). When a predetermined time (for example, 12 hours) has elapsed since the start of the cold-holding operation by the battery, the cooling performance of the cold-storage agent decreases, so that the blower is stopped and the cold-holding operation ends. However, for a predetermined period of time (for example, 3 hours) after the cold-holding operation is stopped, the fact that the cold-holding operation is stopped and the temperature in the refrigerator are displayed to improve user convenience.

[0005]

However, in this cold storage type cold storage, once the power plug is removed and the cold storage operation is started by the battery, the cold storage operation is performed after the predetermined time elapses regardless of the necessity of cooling in the storage. The cooling operation stops. On the other hand, as a usage mode of this kind of regenerative cold storage, it often takes a certain time from when the power plug is removed to when the product is actually stored and used in the refrigerator. For example, when two cold storage cool storages are used in a place where there is only one power plug, the second cold storage cool storage is charged and charged after the first cold storage and charging is completed. And then start using both. In this case, there is a problem that the cold storage operation time is shortened because the first cold storage cold storage performs the cold storage operation during the cold storage / charging of the second cold storage cold storage.

[0006] After the cooling operation by the battery is started, the cooling operation is performed until the predetermined time elapses. However, the elapsed time from the cooling operation or the remaining time until the end of the cooling operation is not displayed. Was lacking. In other words, it is possible to use the regenerator without re-cooling and recharging if the refrigerating agent has sufficient cooling capacity.However, since there is no means to know this, unnecessary refrigerating / charging was sometimes performed. .

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a regenerative refrigerator having excellent use efficiency of a regenerator and user convenience.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a regenerator, a cooling device for cooling the regenerator, a blower for circulating cool air by the regenerator in a refrigerator, A power supply detecting means for detecting power supply from the outside in a regenerative cold storage that cools the inside of the refrigerator by circulating cool air by driving a blower, and a time after the external power supply is cut off. Time-measuring means, and input means for inputting the operation switching of the blower, and start the drive control of the blower based on a detection signal that detects the supply cutoff of the external power supply, and when the operation stop is input by the input means, Stops the driving of the blower and the timing of the timing means, and when the operation start is input by the input means, returns the driving of the blower and the timing of the timing means, and the preset time can be kept cool. Propose those characterized by further comprising a control means for stopping the blower after the lapse between.

According to the present invention, when the external power supply is cut off, the drive control of the blower is performed until the time measured by the time counting means reaches a preset coolable time, thereby keeping the refrigerator cool. Here, if the operation stop is input by the input means during the cold keeping in the refrigerator, the driving of the blower is stopped to stop the cold keeping operation in the refrigerator, and the time counting by the timing means is stopped. In other words, while the cold storage operation is stopped, a decrease in the cold storage capacity of the cold storage agent becomes small. Accordingly, by stopping the time measurement, the available time can be extended while maintaining the cold storage capacity of the cold storage agent.

[0010] In the invention according to claim 2, there is provided temperature detecting means for detecting the temperature of the regenerator, and the control means makes the temperature of the regenerator higher than a predetermined set temperature while the timer of the timer is stopped. In such a case, it is suggested that the timing be restored.

In the present invention, the temperature of the regenerator rises while the time keeping by the time keeping means is stopped, and the time keeping restarts when the temperature becomes higher than a predetermined set temperature. As described above, while the cooling operation is stopped, the cooling performance of the regenerator is small. However, when the cooling operation is stopped for a long time, the cooling performance is not negligible. So, by restoring the timing,
We try not to extend the available time too much. This makes it possible to prevent a cold-holding operation in a state where the cold-holding capacity is insufficient.

According to a third aspect of the present invention, there is provided a display device for displaying a remaining time until expiration of the cool-down time when an operation stop or an operation start is inputted by the input means. suggest.

[0013] According to the present invention, the remaining time until the expiration of the cool-down time is displayed on the display means every time the input operation of the input means is performed, which is convenient for the user.
Further, since the remaining time is not always displayed, it is possible to prevent the battery from being wasted due to the excessive time display.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A regenerative cold storage according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the appearance of a cool storage cooler, FIG. 2 is a side sectional view of the cool cool cooler, FIG. 3 is an enlarged view of an operation panel, FIG. 4 is a schematic circuit diagram of a power supply system of the cool cool cooler, FIG. Is a schematic configuration diagram of the control device, and FIGS. 6 to 10 are flowcharts for explaining the operation of the control device.

This regenerative cold storage (hereinafter simply referred to as a "refrigerator")
1), as shown in FIG. 1, includes a cold storage main body 2 having a front opening, and a heat insulating door 3 for opening and closing the front opening of the cold storage main body 2. An operation panel 4 for performing various displays and operations is attached to an upper front portion of the cool box main body 2. A power supply connector 5 for connecting an AC power supply is provided at an upper portion of the front surface of the cool box 2. This cool box 1 stores the cold storage agent and charges the battery by connecting the power cable C at a predetermined place. Further, wheels 4a for transportation are attached to the four corners of the bottom surface of the cool box main body 2.

As shown in FIG. 2, the cool box main body 2 is formed of a heat insulating material having a substantially U-shaped cross section. Refrigerator body 2
A heat-insulating back plate 6 and a bottom plate 7 are arranged on the back side and the bottom side inside the box, at a distance from the wall surface of the cool box body 2. Thus, a storage room 8 for articles is formed above the bottom plate 7 and in front of the back plate 6, a cool storage agent chamber 9 is formed below the bottom plate 7, and a cool air passage 10 is formed behind the back plate 6. The storage room 8 and the cool storage agent room 9 communicate with each other at the front part of the cool storage body 2, and the cool storage agent room 9 and the cool air passage 10 are connected to the cool storage body 2.
The cold air passage 10 and the storage room 8 communicate with each other at the rear upper portion of the cool box 2. Further, a machine room 11 is formed in an upper part of the cool box main body 2.

The regenerator 9 is provided with a regenerator 12 for cooling the inside of the refrigerator and an evaporator 13 which is provided in thermal contact with the regenerator 12. Thereby, the evaporator 1
3 is cooled, cold energy is accumulated in the regenerator 12. As the evaporator 13, for example, a thin plate such as a pipe formed in a meandering shape or a roll bond formed by laminating a plate-like member having a groove meandering on its surface and a plate-like member covering the groove is used. Shaped ones are used.

On the surface of the regenerator 12, a regenerator temperature sensor 14 for detecting the temperature of the regenerator 12 is provided. As the regenerator temperature sensor 14, for example, a thermistor is used.

The storage room 8 is provided with a blower 15 near the outlet of the cool air passage 10. The blower 15 cools the storage room 8 by blowing cool air from the cool storage agent room 9 into the storage room 8 through the cool air passage 10.

The cold air passage 10 is provided with an internal temperature sensor 16 for detecting the internal temperature. The in-compartment temperature sensor 16 is provided at a position slightly higher than the center in the cold air passage 10. Thereby, the in-compartment temperature sensor 16 can detect a temperature substantially equal to the temperature in the storage room 8. As the internal temperature sensor 16,
For example, a thermistor is used.

In the machine room 11, a compressor 17 and a condenser 18 which are connected to the evaporator 13 to constitute a refrigerating apparatus are arranged. In addition, a condenser fan 19 that mainly cools the condenser 18 is provided. The machine room 11 communicates with the outside of the cool box 1, and the outside air is introduced into the machine room 11 by driving the condenser fan 19.

The operation panel 4 is, as shown in FIG.
It has a display 20 for displaying various information, a changeover switch 21 for inputting an operation changeover of the blower 15, and temperature selection switches 22 and 23 for selecting a temperature in the refrigerator.

The display 20 includes a first display 20a for displaying that the cold storage agent 12 is being stored, a second display 20b for displaying that the storage of the cold storage agent 12 has been completed, and the storage room 8. Display 20c that indicates that the device is being kept cool
And a fourth display 20d for displaying the room temperature of the storage room 8 and for displaying the remaining time during which the cool operation can be performed.
Here, the first to third indicators 20a to 20c are configured by, for example, LEDs. In addition, the fourth display 20
d is constituted by, for example, a 7-segment LED.

The changeover switch 21 switches whether or not to control the cooling of the storage room 8 by controlling the operation of the blower 15. The signal of the changeover switch 21 is input to a control device 40 described later. Further, the temperature selection switches 22 and 23 select the inside temperature of the storage room 8. As the inside temperature, the temperature selection switch 22 selects the refrigeration temperature (about 3 ° C.), and the temperature selection switch 23 selects the freezing temperature (about −22 ° C.).

As shown in FIG. 4, the cool box 1 includes a stabilized DC power supply 31 and a battery 32. When the refrigerator compartment 1 is connected to an AC power supply AC, the DC stabilized power supply 31 converts the DC power to DC and supplies power to the control device 40 and other devices. Further, when the refrigerator 1 is not connected to the AC power supply AC, the battery 32
And power to other equipment. Here, the switching between the DC stabilized power supply 31 and the battery 32 is performed by the power supply switching relay 33.
Done by That is, by connecting the AC power supply AC to the relay coil 33a of the power supply switching relay 33, the first relay switch 33b switches the power supply to be used. The second relay switch 33c is connected to the control device 40
, So that the control device 40 can detect the switching of the used power supply. The battery 32 is a storage battery that is charged by a charging circuit (not shown).

The cool box 1 is controlled by a control device 40 as shown in FIG. The control device 40 has a CPU
41, a ROM 42, a RAM 43, a timer 44,
It is provided with an I / O interface 45 for connecting to various devices and a bus 46 for connecting these. The control circuit 40 is connected to the second
Relay switch 33c, the changeover switch 21, the regenerator temperature sensor 14, the refrigerator temperature sensor 16, and the blower 1
5. The compressor 17 is connected to the display 20 and the like.

The refrigerator 1 is controlled based on a control program stored in the ROM 42. Hereinafter, the control will be described with reference to the flowcharts of FIGS.

When the control program starts to operate when the power supply cable C is attached to the power supply connector 5 and the supply of AC power is started, first, as shown in FIG. Cold storage control is performed (step S1). After that, when the cool box 1 is driven by the battery 32, the processing is shifted to cool control (steps S2 and S3). Here, the detection that the power source is the battery 32 may be achieved by detecting conduction of the second relay switch 33c. Hereinafter, each control of steps S1 and S3 will be described in detail.

In the cold storage control in step S1, as shown in FIG. 7, a cold storage lamp, that is, the first display 20a is first lit (step S11). Next, the cooling device such as the compressor 17 is driven to start the cold storage of the cold storage agent 12 (step S12). If the changeover switch 21 is pressed during the cold storage, a process for switching the cold storage control of the storage room 8 is performed (Step S13,
S14). This switching process will be described later.

Next, when the cold storage of the cold storage agent 12 is completed,
The cold storage completion lamp, that is, the second display 20b is turned on (steps S15 and S16). Here, the completion of the cold storage may be determined by detecting whether or not the temperature of the cold storage 12 has reached a predetermined temperature (for example, about −36 ° C.) by the cold storage temperature sensor 14. Thereafter, the cooling device such as the compressor 17 is controlled to maintain the cold storage state of the cold storage agent 12 (step S17). In the operation for maintaining the cold storage state, when the temperature of the cold storage agent 12 becomes lower than the predetermined temperature, the cooling device is stopped, and the temperature of the cold storage agent 12 becomes several degrees (for example, 3 degrees) higher than the predetermined temperature. In this case, the operation is performed by returning the operation of the cooling device. If the operation changeover switch 21 is pressed during the operation of maintaining the cold storage state, a process for switching the cold storage of the storage room 8 is performed (steps S18 and S19). This process is the same as step S14, and the switching operation will be described later.

As shown in FIG. 8, the switching process in the steps S14 and S19 is to stop the cooling if the storage room 8 is being kept cold, and to start the cooling if the storage is stopped (step S19). S21 to S25). Here, to keep the storage room 8 cool, the blower 15 is drive-controlled based on the internal temperature sensor 16 so as to maintain the inside of the storage room 8 at a predetermined temperature (step S22). At the same time, the inside-cooling lamp, that is, the third display 20c is turned on, and the fourth temperature indicator 20d is provided on the fourth display 20d.
6 is displayed (step S2).
3). To stop the cooling of the storage room 8, it is sufficient to stop the blower 15 and stop the display of the indicators 20c and 20d (steps S24 and S25). Note that the cooling temperature of the storage room 8 is selected by the temperature selection switches 22 and 23 as described above.

According to the above steps, when the changeover switch 21 is depressed during the cold storage of the regenerator 12 and after the completion of the cold storage, the cold storage and the cold stop of the storage room 8 are switched each time the switch 21 is pressed.

Next, when the supply of power is stopped due to the release of the power cable C or the stop of energization, the processing shifts to the cool keeping control shown in FIG. 9 (see steps S2 and S3). When the process shifts to the cool keeping control, first, the first display 20a (the cold storage lamp) is turned off (step S31). In addition, the display of the third display 20c (in-chamber cooling lamp) and the fourth display 20d (temperature display) is started (step S).
32). Next, time measurement by the timer 44 is started (step S33).

When the time measured by the timer 44 exceeds the first set time, the process proceeds to step S45 to end the cooling of the storage room 8 (step S34). Here, the first
The set time indicates the maximum coolable time after the cooling of the storage room 8 is started by driving the battery, and is set in advance according to the cooling ability of the cold storage agent 12. In the present embodiment, it is set to 12 hours. If the time measured by the timer 44 is within the first set time, the changeover switch 21
It is determined whether or not has been pressed (step S35). If not, the drive control of the blower 15 is performed to maintain the storage room 8 at the predetermined temperature (step S36). This control is similar to the control in step S22 described above. If the changeover switch 21 has been pressed, the process proceeds to step S37 to temporarily stop the cooling of the storage room 8.

To temporarily stop the cooling of the storage room 8, the blower 15 is first stopped (step S37). Next, the timer 44 temporarily stops the counting (step S3).
8). Further, the remaining time until the coolable time expires is displayed on the fourth display 20d for several seconds (for example, 3 seconds), and the third display (cooling lamp in the refrigerator) is turned off (step S39). ). Here, the remaining time is
The time may be obtained by subtracting the time measured by the timer 44 from the first set time.

While the cooling of the storage room 8 is stopped, the temperature of the regenerator 12 rises, albeit moderately. It is considered that when the cold-holding time is prolonged, when the cold storage in the storage room 8 is restarted, the cool-preservable time of the cold storage agent 12 is reduced to a considerable extent. Therefore, when the temperature of the cold storage agent 12 becomes higher than the predetermined temperature, the timer 44 is reset (steps S40 and S41). Here, the reference predetermined temperature was set to the same temperature as when restarting the operation of the cooling device when maintaining the cold storage state of the cold storage agent 12 in steps S14 and S22. Then, similarly to step S34, the time counted by the timer 44 is the first time.
If the set time has elapsed, the process proceeds to step S45 (step S42).

Also, while the cooling of the storage room 8 is stopped, it is determined whether or not the changeover switch 21 is pressed (step S43). When the changeover switch 21 is pressed, the fourth display 20d is operated in the same manner as in step S39.
, The remaining time until the time that can be kept cool is expired is displayed for several seconds (for example, 3 seconds), and the process proceeds to step S32 in order to restart the keeping of cold in the storage room 8.

When the time measured by the timer 44 has exceeded the first set time, first, the display of the third display 20c (cooling lamp in the refrigerator) is stopped, and the blower 15
Is stopped (steps S45 and S46). Then
The timer 44 is reset to start a new time measurement (step S47). Then, the internal temperature is blinked on the fourth display 20d until the time measured by the timer 44 elapses the second set time, and the temperature display is stopped after the second set time elapses (step S48, S49, S
50). Here, the second set time defines a time for which the temperature display is continued after the cooling of the storage room 8 is completed, and is set in advance. In the present embodiment, it is set to 3 hours.

According to the cold storage type cold storage 1 according to the present embodiment, the power supply from the external power supply is cut off.
When the battery drive is started, the timer 44 starts counting time. The drive control of the blower 15 is performed until the measured time reaches the first set time, which is set in advance, to keep the refrigerator cool. Here, the change-over switch 21
When the button is pressed, the driving of the blower 15 is stopped to stop the cool operation in the refrigerator, and the timer 44 stops counting time. That is, while the cold storage operation is stopped, the decrease in the cold storage capacity of the cold storage agent 12 is small. Accordingly, by stopping the time measurement, the available time can be extended while maintaining the cold storage capacity of the cold storage agent 12.

Further, while the cold storage of the storage room 8 is stopped, the cold storage agent 12
When the temperature becomes higher than a predetermined set temperature, the timing is restarted. When the cold-holding time is prolonged, the temperature of the cold storage agent 12 rises to such an extent that the cooling capacity is affected. So, timer 4
By restoring the time measurement of 4, the available time is not excessively extended. This makes it possible to prevent a cold-holding operation in a state where the cold-holding capacity is insufficient.

Further, each time the switch 21 is pressed, the remaining time until the expiration of the cool-down time is displayed on the fourth display 20d, which is convenient for the user. Further, since the remaining time is not always displayed, it is possible to prevent the battery from being wasted due to the excessive time display.

In this embodiment, one changeover switch 2 is used as input means for inputting the operation changeover of the blower.
1, but the present invention is not limited to this. For example, two switches may be provided, and one may be used as input means for starting driving of the blower and the other for stopping driving. Further, for example, a touch panel or the like may be used.

[0043]

As described above in detail, according to the first aspect of the present invention, when the external power supply is cut off, the drive control of the blower is performed until the time measured by the time measuring means reaches the preset coolable time. The inside of the warehouse is kept cool. Here, if the operation stop is input by the input means during the cold keeping in the refrigerator, the driving of the blower is stopped to stop the cold keeping operation in the refrigerator, and the time counting by the timing means is stopped. In other words, while the cold storage operation is stopped, the decrease in the cold storage capacity of the cold storage agent is small,
By stopping the time measurement in accordance with this, it is possible to extend the available time while maintaining the cooling performance of the regenerator.

According to the second aspect of the present invention, the temperature of the regenerator increases while the time measurement by the time measurement means is stopped.
When the temperature becomes higher than the predetermined set temperature, the timing is restarted. As described above, while the cooling operation is stopped, the decrease in the cooling performance of the regenerator is small, but when the cooling operation is stopped for a long time, the deterioration in the cooling performance is not negligible. Therefore, by restoring the time measurement, the available time is not excessively extended. This makes it possible to prevent a cold-holding operation in a state where the cold-holding capacity is insufficient.

Further, according to the third aspect of the present invention, the remaining time until the end of the cool-down time is displayed on the display means every time the input operation of the input means is performed, which is convenient for the user. Further, since the remaining time is not always displayed, it is possible to prevent the battery from being wasted due to the excessive time display.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a regenerative refrigerator.

FIG. 2 is a side cross-sectional view of a cold storage type cool box;

FIG. 3 is an enlarged view of an operation panel.

FIG. 4 is a schematic circuit diagram of a power supply system of a regenerative refrigerator.

FIG. 5 is a schematic configuration diagram of a control device.

FIG. 6 is a flowchart illustrating the operation of the control device.

FIG. 7 is a flowchart illustrating the operation of the control device.

FIG. 8 is a flowchart illustrating the operation of the control device.

FIG. 9 is a flowchart illustrating the operation of the control device.

FIG. 10 is a flowchart illustrating the operation of the control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cold storage type cold storage box, 2 ... Cold storage main body, 3 ... Door, 4 ... Operation panel, 8 ... Storage room, 9 ... Cold storage agent room, 10 ... Cold air passage,
11 ... machine room, 12 ... cool storage agent, 13 ... evaporator, 14 ... cool storage agent temperature sensor, 15 ... blower, 16 ... internal temperature sensor, 17 ... compressor, 18 ... condenser, 20 ... display, 21
... Changeover switch, 31 ... DC stabilized power supply, 32 ... Battery, 40 ... Control device,

Continued on the front page (72) Inventor Keisuke Miura 20 Kotobukicho, Isesaki-shi, Gunma F-term in Sanden Co., Ltd. (Reference) 3L045 AA02 BA01 CA02 DA02 EA01 FA03 KA16 LA09 LA18 MA01 MA12 NA03 NA16 PA02 PA03 PA04

Claims (3)

[Claims] A cooling device that cools the regenerator, a blower that circulates cold air from the regenerator into the refrigerator, and a battery, and cools the refrigerator by driving the cooler to circulate the cool air. In a regenerative refrigerator, a power supply detecting means for detecting an external power supply, a time measuring means for measuring a time after the external power supply is cut off, an input means for inputting a switching operation of a blower, Drive control of the blower is started based on a detection signal that has detected the cutoff of the power supply, and when the operation stop is input by the input means, the drive of the blower and the timing of the timer are stopped, and the operation is started by the input means. Is input, a control means is provided for resetting the drive of the blower and the timekeeping of the timekeeping means, and stopping the blower when the timed time exceeds a preset coolable time. Cold accumulation refrigerator to. 2. A temperature detecting means for detecting the temperature of the regenerator, wherein the control means resets the timer if the temperature of the regenerator becomes higher than a predetermined temperature while the timer of the timer is stopped. The cold storage type cold storage according to claim 1, wherein: 3. The display device according to claim 1, further comprising: display means for displaying a remaining time until the end of the cool-down time when an operation stop or an operation start is input by the input means.
Or the cool storage type cold storage of any one of Claim 2.