JPH11142008A - Cooling system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the power consumption of a cooling device, level the power, and reduce the cost by using inexpensive midnight power. In addition, rapid cooling and uniform cooling of the object to be cooled are achieved. SOLUTION: Switching devices 12 and 16 are opened and switching device 1 is opened.
g and 17 are closed, the refrigerant circuit passing through the compressor 1a and the condenser 1b is switched to the heat storage tank 9 side, and ice is made by midnight power to store heat. In the daytime, the refrigerant circuit is switched, the refrigerant discharged from the compressor 1a is introduced into the heat storage tank 9, the ice is thawed, and the cold heat is supplied to the air cooler 2 via the liquid receiver 1c, the accumulator 1d, and the electronic expansion valve 18. To supply. The liquid receiver 1c provided between the condenser 1b and the accumulator 1d absorbs a change in the refrigerant amount due to a change in the operation state. During the cooling operation, the flow direction of the air around the object to be cooled 4 is reversed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for cooling an object to be cooled such as food by circulating cool air in a target space such as a warehouse.

[0002]

2. Description of the Related Art As a conventional cooling device, page 22 of the fifth edition of Refrigeration and Air Conditioning Handbook, Vol. There is a cooling device described in FIGS. FIG. 10 is a configuration diagram showing this cooling device. In the figure, 1 is a cooling refrigerator, 2 is an air cooler connected to the cooling refrigerator 1 by a refrigerant pipe 7, 3 is a blower attached to the air cooler 2, 4 is a refrigerator in the refrigerator 8. The object to be cooled 5 is a canopy installed above the object to be cooled 4 and 6 is an air cooler 2
Baffle plate forming a ventilation passage for cool air blown out from
Is a refrigerant pipe connecting the cooling refrigerator 1 and the air cooler 2,
Reference numeral 8 denotes a target space, for example, a refrigerated warehouse.

Next, the operation will be described. When the work of storing the object to be cooled 4 in the refrigerated warehouse 8 is completed, the cooling operation of the cooling device is started. When the temperature in the refrigerator starts the cooling operation from room temperature and cools to a predetermined temperature, the cooling operation is performed until the unloading operation. The air cooler 2 installed in the refrigerated warehouse 8 and the cooling refrigerator 1 installed outside the refrigerator are connected to a refrigerant pipe 7.
And cools the air inside the refrigerator warehouse 8 during the cooling operation. The cooled air passes over the air guide plate 6 and the canopy 5 and flows to the object 4 to be cooled. Baffle plate 6 and canopy 5
As a result, the pressure of the air is limited, so that the air is not bypassed, and a differential pressure is applied between the inlet side and the outlet side of the airflow of the object to be cooled 4 to efficiently cool the object to be cooled 4 and flow to the outlet space. . The air that has flowed to the outlet space flows again to the air cooler 2 and repeats this circulation.

[0004]

Since the conventional cooling device is configured as described above, the load is high and the power consumption is large at the start of cooling at room temperature, and the power consumption is reduced as the cooling progresses. In other words, at the time of the start of cooling and the end of cooling, an imbalance in power use occurred. Since the cooling refrigerator 1 is selected at the maximum load, there is a problem that the equipment capacity is increased, and the power supply capacity of the equipment is also increased, and the contract power is increased. In particular, in the case of agricultural products, since they are harvested in the daytime and put in the refrigerated warehouse 8, the power consumption during the daytime increases. For this reason, the cooling device cannot be operated using inexpensive midnight power, and the running cost of the device has been increased.

[0005] Further, as the cooling progresses, there is a problem that a difference in cooling speed occurs between the air inlet side and the air outlet side of the article 4 to be cooled, and the cooling cannot be uniformly performed in the refrigerated warehouse 8.

When the object to be cooled 4 is an agricultural product such as a vegetable, the operation period of the cooling device is limited to each harvesting time according to the type of vegetable, so that the capacity of the equipment is as small as possible. There was a desire to hold it down.

[0007] Further, once the cooling is completed, a cooling operation must be performed until unloading the next day, but in the conventional cooling device, the cooling refrigerator 1 that has performed the cooling operation performs the cooling operation until the next day. I was In addition, the air cooler 2 has a job of producing cold air and cooling an object to be cooled. For this reason, it is necessary to operate the cooling refrigerator 1 and the air blower 2 having large capacities even in the cold-holding operation after the completion of cooling, and the capacities are excessive with respect to the load. There is a problem that the life of the device is shortened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The present invention has been made to reduce the high pressure during operation, to reduce the power consumption at the beginning of the cooling operation, to level the power, and to provide a cooling device. The purpose of the present invention is to reduce the capacity of the device.

Another object of the present invention is to provide a cooling device that stores running heat at night using inexpensive midnight electric power and uses the stored heat to cool the object to be cooled during the day, thereby reducing running costs. It is assumed that.

It is another object of the present invention to provide a cooling device that prevents frequent starting and stopping of equipment during a cooling operation, maintains the cooling device for a long time, and improves reliability.

Another object of the present invention is to provide a cooling device which can increase the cooling efficiency of the object to be cooled in a cooling process in a refrigerated warehouse and can realize rapid cooling and uniform cooling.

[0012]

According to a first aspect of the present invention, there is provided a cooling device in which a compressor, a condenser, and an accumulator are connected by piping, and an inlet for introducing a heat transfer medium and a heat transfer medium are led out to the accumulator. A cooling refrigerator having a lead-out portion for cooling, a heat storage tank for storing and releasing cold heat by ice making and melting, and cooling for supplying cold heat through a heat transfer medium to cool a target space storing an object to be cooled. Cooler, one of which is connected to the inlet of the accumulator, the other is connected to the heat storage tank and the cooler for cooling, respectively, and the suction pipe is connected to the outlet of the accumulator, and the other is the circuit switching device and the expansion valve. Between the condenser and the accumulator, which is connected to the heat storage tank through the liquid outlet and connected to the cooling cooler through the circuit switching device and the electronic expansion valve. It is obtained by a receiver provided on the pipe.

Further, a cooling device according to a second aspect of the present invention includes a discharge pipe connecting the discharge side of the compressor and one side of the heat storage tank,
A liquid inlet side pipe connecting the inlet side of the condenser and the other side of the heat storage tank with the outlet side of the condenser, and the heat transfer medium discharged from the compressor flows into the heat storage tank through the discharge pipe, In this heat storage tank, cold heat is given by thawing, and the cold heat is supplied to the cooling cooler through the liquid receiver, the accumulator, and the liquid outlet side pipe.

The cooling device according to a third aspect of the present invention includes a heat exchanger for exchanging heat between cold obtained by thawing water by circulating water in a heat storage tank and a heat transfer medium flowing into a cooling cooler. It is provided.

Further, a cooling device according to a fourth aspect of the present invention provides a cooling refrigerator having a smaller capacity than that of the cooling refrigerator.
A cooling device having a capacity smaller than that of the cooling cooler and supplied with cold heat by the cooling refrigerator to maintain the temperature of the target space.

The cooling device according to a fifth aspect of the present invention is provided in an object space, wherein air cooled by a cooling cooler is
It is equipped with a blower that circulates so as to apply a differential pressure on both sides of the object to be cooled.

The cooling device according to a sixth aspect of the present invention is such that the flow direction of the air circulation path in the target space can be switched between forward and reverse.

The cooling device according to a seventh aspect of the present invention is a heat storage operation in which a refrigerant circuit is switched to condense in a condenser of a cooling refrigerator and evaporate in a heat storage tank; It is possible to switch the operation pattern between a heat storage heat dissipation operation that evaporates with a cooler and a normal cooling operation that condenses with a condenser of a cooling refrigerator and evaporates with a cooling cooler, and further condenses with a cooling refrigerator. It is provided with an operation pattern of a cooling operation in which the cooling air cooler evaporates.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a cooling device according to a first embodiment of the present invention will be described with reference to the drawings. FIG.
4 to 4 are circuit configuration diagrams showing states of different operation patterns of the first embodiment. 1 is a circuit configuration diagram of a normal cooling operation that does not use heat storage, FIG. 2 is a circuit configuration diagram of a heat storage operation, FIG. 3 is a circuit configuration diagram of a radiation cooling operation, and FIG. 4 is a circuit configuration diagram of a cold storage operation.

In FIG. 1, reference numeral 1 denotes a cooling refrigerator having a plurality of devices and piping. 1a is a refrigerant compressor, 1b is an air-cooled condenser comprising a blower 1b1 and a heat exchanger 1b2,
When the blower 1b1 is operated, the outside air is passed through the heat exchanger 1b2 to exchange heat between the refrigerant as a heat transfer medium and the outside air, thereby condensing the refrigerant. Reference numeral 1c denotes a liquid receiver, which is a container having a structure for storing the condensed refrigerant liquid therein. 1d is a container structure, an accumulator for preventing the refrigerant liquid from flowing into the refrigerant compressor 1a, 1e is a discharge check valve as a discharge check device, 1f and 1g are refrigerant circuit switching devices such as electromagnetic valves,
h, 1i are liquid check valves which are liquid check devices, 1j, 1k, 1
Reference numerals 1 and 1m denote stop valves serving as refrigerant circuit closing devices, 1n denotes a dust removing device, and 1p denotes a device for returning oil accumulated in the accumulator 1d. This oil return device 1p removes the oil accumulated at the bottom of the accumulator 1d little by little by a refrigerant compressor 1a.
Has the function to return to. Cooling refrigerator 1 with the above equipment
Is composed.

Reference numeral 2 denotes a cooling cooler, for example, a cooling air cooler incorporating a small blower. Reference numeral 3 denotes a cooling fan, 4 denotes an object to be cooled, and 6 denotes a baffle plate / partition plate which is arranged so as to partition an inlet space and an outlet space of the object to be cooled 4 and guides air blown out from the cooling fan 3. To wind. 7a, 7
Reference numerals b, 7c, and 7d denote refrigerant pipes connecting the cooling refrigerator 1 and the load side, respectively, 7a denotes a discharge pipe, 7b denotes a liquid inlet side pipe, 7c denotes a liquid outlet side pipe, and 7d denotes a suction pipe.
8 is a target space, for example, a refrigerated warehouse, 9 is a heat storage tank for storing and releasing cold heat by ice making and ice melting, and 10 is a refrigerator for cooling, which is not shown in detail, but is a compressor, an air-cooled condenser, and a blower for a condenser. , And a control device. 1
Reference numeral 1 denotes an air cooler for cooling, which is composed of, for example, a heat exchanger and a blower, and is supplied with cold heat by a refrigerator 10 for cooling. Reference numerals 12 and 13 denote refrigerant circuit switching devices, for example, solenoid valves, 1
4 is an expansion valve, 15 is a check valve which is a check device, 16, 17
Is a refrigerant circuit switching device, for example, an electromagnetic valve, 18 is an electronic expansion valve for the cooling air cooler 2, 19 is a refrigerant circuit switching device of the cooling refrigerator 10, for example, an electromagnetic valve, and 20 is a cooling air cooler 10 Expansion valve. Here, the stop valves 1i, 1
Reference numerals j, 1k, 11 and 1m are, for example, shut-off valves for manually shutting off each circuit. Here, when the refrigerant circuit switching device 12 has a backflow prevention function, the check valve 15 is unnecessary.

As shown in the figure, the outlet of the refrigerant compressor 1a is connected to an air-cooled condenser 1b via a refrigerant circuit switching device 1f and a stop valve 1j.
g, the heat storage tank 9 through the discharge pipe 7a through the stop valve 1q.
It is connected to. The liquid receiver 1c is connected to a liquid refrigerant pipe between the air-cooled condenser 1c and the accumulator 1d. The inlet side of the liquid receiver 1c is connected to the air-cooled condenser 1b by a refrigerant pipe, for example, and is connected to the heat storage tank 9 via the refrigerant circuit switching device 13 through the liquid inlet side pipe 7b. A heat exchanger composed of, for example, a supercooling coil is arranged in a lower portion inside the accumulator 1d, and an outlet side of the liquid receiver 1c communicates with a supercooling coil of the accumulator 1d through a refrigerant pipe. The outlet pipe of the supercooling coil serving as the outlet of the refrigerant from the cooling refrigerator 1 passes through the liquid outlet pipe 7c, is connected to the heat storage tank 9 via the load-side refrigerant circuit switching device 12, and is connected to the refrigerant. It is connected to the cooling air cooler 2 via a circuit switching device 17. Further, a gas inlet side serving as a refrigerant introduction portion from the load side of the accumulator 1d is connected to a cooling air cooler 2 serving as an evaporator and a suction pipe 7d connected to a gas return pipe of the heat storage tank 9,
The gas outlet side is attached to a suction pipe of the compressor 1a. The accumulator 1d temporarily absorbs the refrigerant liquid that could not be sufficiently evaporated in the cooling air cooler 2 and the heat storage tank 9 functioning as an evaporator, and prevents the refrigerant liquid from directly flowing back to the compressor 1a. Further, a heat exchanger is arranged at the bottom of the accumulator 1d, and the heat of the condensed and liquefied refrigerant is used to evaporate the refrigerant liquid accumulated in the accumulator 1d and return it to the compressor 1a as refrigerant gas.

The refrigerating machine 10 is a refrigerant circuit switching device 1
9. It is connected to the cool air cooler 11 via the expansion valve 20. The capacity of the cooler 10 is smaller than the capacity of the cooler 1, and the capacity of the cooler 11 is smaller than the capacity of the cooler 2.

In the refrigerated warehouse 8, for example, agricultural products packed in cardboard with vents are stored as the object to be cooled 4, and the target cooling temperature of the object to be cooled 4, that is, the optimum storage temperature depends on the type of food. Differently, for example, lettuce, cabbage, carrot, onion and the like are at about 0 ° C., and tomato, pepper, okra, pumpkin and the like are at about 10 ° C.

FIG. 5 shows the relationship between the operation pattern according to the present embodiment, the internal temperature, and the power consumption, and the horizontal axis indicates time. Hereinafter, the cooling process for one day in the refrigerated warehouse 8 will be described with reference to FIGS. Assuming that the object to be cooled 4 is, for example, a crop, the object to be cooled 4 is harvested during the day and stored in the refrigerated warehouse 8, and rapidly cooled during the day to prevent quality deterioration. This cooling is performed on the object 4
Is a large cooling load, and mainly operates the cooling air cooler 2 and also operates the cooling air cooler 11 to cool the refrigerated warehouse 8. Also, at night, the object to be cooled 4 is in a considerably cold state, the load on the object to be cooled 4 is small, and it is sufficient to perform cold preservation while maintaining a low temperature. The cold storage in the refrigerated warehouse 8 is mainly performed by the cooler air cooler 11. As shown in the lowermost column of FIG.
The cooling is started at about 2:00, and the cooling is finished at about 18:00 on the assumption that the desired cooling target temperature has been reached. The cooling during this time is called, for example, a rapid cooling operation. Then, the cool keeping operation is performed at night after the cooling is completed. From around 8:00 in the morning to around 12:00 in the afternoon, it is necessary to carry out the loading / unloading work of the object to be cooled 4, and the cooling of the refrigerated warehouse 8 during this period is stopped.

Next, the cooling operation in the refrigerated warehouse 8 will be described. In the rapid cooling operation, the cooling blower 3, the cooling air cooler 2, and the cool keeping cooler 11 are operated. The airflow generated by rotating the cooling blower 3 in the forward direction has directivity in a direction parallel to the baffle plate / partition plate 6 due to the effect of the baffle plate / partition plate 6, so that the cooling object 4 is cooled. It flows into one side space. Here, since there is no sufficient space around the object 4 to allow air to pass through, the pressure on one side of the cooling blower 3, that is, the pressure on one side of the object 4 to be cooled gradually increases with respect to the other pressure. go. For this reason, a differential pressure is generated on both sides of the object 4 to be cooled. Generally, when a differential pressure is generated on both sides of an object, even if the gap between them is very small, a flow is generated through the gap according to the magnitude of the differential pressure. Therefore, air flows from one side of the object to be cooled 4 to the other through the inside and the periphery of the object to be cooled 4. Then, the air reaching the other side of the object to be cooled 4 forms an air circulation path in which the air is sucked into the cooling blower 3 again. Since the cooling air cooler 2 and the cooling air cooler 11 are in the air circulation path, the entire air circulating in the refrigerated warehouse 8 is cooled by the action of the cooling air cooler 2 to lower the temperature. . The low-temperature air passes through or around the object to be cooled, thereby cooling the object to be cooled. In the cool keeping operation, the cooling air cooler 2 is stopped and the cool air cooler 11 is operated to keep the refrigerator 8 cool.

In the quenching operation described above, since the inlet space and the outlet space of the cooling blower 3 are separated by the baffle plate / partition plate 6, a differential pressure is applied to both sides of the object 4 to be cooled, and a uniform and rapid pressure is applied. Cooling is possible. In cooling the object to be cooled 4, the larger the differential pressure between the two ends of the object to be cooled 4, the greater the flow velocity of air on the surface of the object to be cooled 4, and the higher the cooling speed. And desirable. However,
If this pressure difference is too large, a large amount of blower power is required, which is not practical. A practical differential pressure between both ends of the cooling object 4, in which the power of the cooling blower 3 is not so much applied and the cooling speed of the cooling object 4 is secured at a sufficient speed, is
It is desirable that the flow velocity of the air on the surface of is set to about 0.5 to 2 m / s and the cooling of the object to be cooled 4 is completed in about 6 hours. For example 20 mm H ₂ O about when the object to be cooled 4 lemon and onions in the case of grapefruit 10 mm H ₂ O of about, in the case of oranges is 50~100m
It is on the order of mH ₂ O.

When the temperature in the refrigerator decreases and reaches a temperature obtained by adding, for example, 3 ° C. to the cooling target temperature of the object 4 to be cooled, the cooling blower 3 is reversed to flow the air in the object 4 in the circulation direction of the air. Is reversed, more uniform cooling can be performed. When the flow of the air in or around the object 4 to be cooled is performed only in one direction, there is a phenomenon that the front of the object 4 cools better in the direction of the air flow and the rear does not cool much. It can happen. For this reason, when the refrigerated warehouse 8 has cooled to some extent during the period from the start of cooling to the end of cooling, the rotation direction of the cooling blower 3 is reversed so that the flow of air in or around the object to be cooled 4 is reversed. Is performed, the cooling of the object to be cooled 4 is performed more rapidly and uniformly. Means for reversing the rotation direction of the cooling blower 3 can be realized, for example, by reversing the motor. Further, even if the rotation direction of the cooling blower 3 is not reversed, the flow of the cool air in the object to be cooled 4 can be reversed by switching the air circulation path by the damper.

As shown in the lowermost column of FIG. 5, the cooling operation mode of the refrigerated warehouse 8 includes a rapid cooling operation mode and a cold storage operation mode, and is controlled so as to be switched according to time or the temperature of the refrigerated warehouse 8. . In order to realize such cooling, the cooling device is provided with four patterns of a normal cooling operation, a heat storage operation, a heat storage / radiation operation, and a cold storage operation, and a heat transfer medium according to a state of the cold storage 8 to be cooled. Operate by switching the circulation circuit. Roughly speaking, the normal cooling operation is an operation pattern of condensing in the cooling refrigerator 1 and evaporating in the cooling air cooler 2, and the heat storage operation is condensing in the cooling refrigerator 1 and evaporating in the heat storage tank 9. The heat storage and heat dissipation operation is an operation pattern in which the heat is condensed in the heat storage tank 9 and evaporated in the cooling air cooler 2, and the cold storage operation is the operation in which the cold storage is condensed in the refrigerator 10. Cooling air cooler 1
1 is an operation pattern of evaporating. In the quenching operation mode of the refrigerated warehouse 8, the normal cooling operation pattern or the heat storage / radiation operation pattern is appropriately performed. In the cold storage operation mode, the cold storage operation pattern is performed. Do.

Hereinafter, the flow of the refrigerant as the heat transfer medium in each of the operation patterns will be described. First, the normal cooling operation pattern will be described with reference to FIG. In the normal cooling operation, the cooling refrigerator 1 is operated to supply the cooling air to the cooling air cooler 2. In the cooling refrigerator 1, the refrigerant circuit switching device 1f is opened, and the refrigerant compressed by the refrigerant compressor 1a flows to the air-cooled condenser 1b. By operating the condenser blower 1b1 of the air-cooled condenser 1b, outside air is passed through the condenser heat exchanger 1b2, and the high-temperature and high-pressure refrigerant gas flowing from the refrigerant compressor 1a is condensed and liquefied. The liquefied refrigerant is
It accumulates in the liquid receiver 1c through the check valve 1h. This receiver 1c
Has a function of absorbing fluctuations in the amount of refrigerant in the system due to changes in operating conditions. Further, the check valve 1e prevents the refrigerant accumulated in the air-cooled condenser 1b from flowing backward through the refrigerant compressor 1a to the low pressure side when the refrigerant compressor 1a is stopped. Similarly, the check valve 1h prevents the refrigerant in the liquid receiver 1c from flowing back to the air-cooled condenser 1b when the refrigerant compressor 1a is stopped. The refrigerant flowing out of the liquid receiver 1c passes through the stop valve 11 and the dust removing device 1n, passes through the supercooling coil of the accumulator 1d, exchanges heat, and is cooled. Then, the liquid is sent to the refrigerant circuit switching device 17 and the electronic expansion valve 18 through the liquid outlet side pipe 7c. The high-pressure refrigerant liquid is reduced to a low-pressure pressure by the electronic expansion valve 18 and evaporates while cooling the refrigerated warehouse 8 by the cooling air cooler 2. The refrigerant gas evaporates and passes through the suction pipe 7d, the accumulator 1d, the refrigerant compressor 1
Go back to a. At this time, the refrigerant circuit switching devices 1g, 12, 13, and 16 connected to the heat storage tank 9 are closed. Further, the refrigerant circuit switching device 19 is opened, and the cooling refrigerator 1 is opened.
The air in the refrigerated warehouse 8 is cooled by activating the air cooler 11 and the cooler 11.

Next, a heat storage operation pattern will be described with reference to FIG. The cooling refrigerator 1 performs a heat storage operation in which cold energy is stored in ice in the heat storage tank 9 by using late-night power, which is cheap at night. Since the flow of the refrigerant in the cooling refrigerator 1 is the same as in the normal cooling operation, the description is omitted. Refrigerant circuit switching device 1
2, 16 are opened, and the refrigerant circuit switching devices 1g, 13, 17 are closed. The refrigerant liquid condensed in the air-cooled condenser 1b and stored in the liquid receiver 1c passes through the liquid outlet side pipe 7c, passes through the refrigerant circuit switching device 12, the check valve 15, the expansion valve 14, and evaporates in the heat storage tank 9. . The refrigerant circuit switching device 16 and the suction pipe 7
Then, it flows to the accumulator 1d and the refrigerant compressor 1a through d. In this way, when the refrigerant is circulated and evaporated in the heat storage tank 9, cold heat is stored in the heat storage tank 9 with ice.

Next, the heat storage / radiation operation pattern will be described with reference to FIG. As described above, in the early stage of cooling, the temperature inside the refrigerator is high and the cooling load is large, and the refrigerated warehouse 8 needs to be rapidly cooled. The heat storage / radiation operation pattern is a pattern operated in the rapid cooling operation mode. In the heat storage operation pattern, the cold heat stored in the heat storage tank 9 with ice is used for the heat storage of the refrigerated warehouse 8. The refrigerant circuit switching devices 1f, 12, 16 are closed, and the refrigerant circuit switching devices 1g, 13 are opened. The refrigerant gas compressed by the compressor 1a is supplied from the refrigerant circuit switching device 1g to the discharge pipe 7a.
Through the heat storage tank 9. The refrigerant gas exchanges heat with ice stored in the heat storage tank 9 and condenses to radiate heat. The condensed refrigerant liquid is supplied to the refrigerant circuit switching device 13 and the liquid inlet side pipe 7.
b, passes through the check valve 1i and accumulates in the liquid receiver 1c. Liquid receiver 1
The flow circulating from c to the cooling air cooler 2 is the same as in the normal cooling operation pattern, and will not be described here. In this operation mode, the air-cooled condenser 1b of the refrigerator 1 is not operated, and the cold stored in the ice heat storage tank 9 is cooled.
To supply. Further, the refrigerant circuit switching device 19 is opened, and the refrigerator 10 and the air cooler 11 are operated to cool the air in the refrigerated warehouse 8.

Since the inside of the heat storage tank 9 is ice or water near 0 ° C. stored with ice, the circulating refrigerant exchanges heat with ice or water, so that the air-cooled condenser 1 using ordinary outside air is used.
The high pressure during operation is much lower than when using b. Therefore, power consumption during operation is greatly reduced. Since the differential pressure of the high and low pressures in the refrigerant circuit is small, the normal expansion valve cannot supply a sufficient amount of the refrigerant liquid. However, in this embodiment, since the electronic expansion valve 18 is used, the refrigerant is stable even at a low differential pressure. The liquid flow rate can be secured.

Next, the cooling operation pattern will be described with reference to FIG. This operation pattern is a pattern mainly operated at night when there is no cooling load. In order to maintain the temperature in the refrigerator 8, the refrigerator 10 and the air cooler 11 are used.
And the refrigerant circuit switching device 19 is opened. In the cold storage operation pattern, since there is no load in the cold storage 8, the refrigerator 10 for cooling may have a smaller capacity than the refrigerator 1 for cooling.
The cooling air cooler 11 may have a smaller capacity than the cooling air cooler 2.

Further, based on the control of the cooling device according to the present embodiment, the inside temperature of the refrigerated warehouse 8, the ON / OFF of the cooling refrigerator 10 and the cooling refrigerator 1, and the power consumption are shown in FIG. Will be explained. As shown in FIG. 5, both the refrigerator for cooling 10 and the refrigerator for cooling 1 are turned off and stopped during the loading / unloading operation. With the start of the loading / unloading operation, the internal temperature rises. The power consumption at this time is zero.

When the loading / unloading operation is completed, cooling is started, and a rapid cooling operation mode is performed. After the cooling is started, the temperature in the refrigerator rapidly decreases with time. In the initial stage of the cooling start, the heat storage / radiation operation pattern is performed, the refrigerant compressor 1a of the cooling refrigerator 1 is turned on to operate, and the heat storage tank 9 is operated as a condenser instead of the air-cooled condenser 1b. The stored cold heat is supplied to the cooling air cooler 2. In this heat storage / radiation operation mode, the high pressure during operation can be reduced, so that the power consumption during operation is reduced by the air-cooled condenser 1b of the refrigerator.
It can be lower than when N is set.

Since the pressure difference between the high and low pressures is reduced, the expansion valve 18 provided on the inlet side of the cooling air cooler 2
Although a normal expansion valve cannot supply a sufficient amount of refrigerant, the present embodiment uses an electronic expansion valve 18.
A stable supply of refrigerant can be achieved, and the quality of equipment can be improved.
In addition, high efficiency operation of the cooling air cooler 2 is possible with low superheat control.

After a certain period of time, the temperature in the refrigerator decreases, and when the cold stored in the heat storage tank 9 is completely used, the operation mode is switched to the normal cooling operation pattern. In this switching, the temperature of ice or water in the heat storage tank 9 is detected, and when this temperature becomes, for example, about 12 ° C. or more, it is determined that the cold heat of the heat storage tank 9 has been used up and the switching is performed.

When the cooling operation is switched to the normal cooling operation pattern and the air-cooled condenser 1b is operated to supply the cooling air to the cooling air cooler 2, the high-pressure pressure is increased, but the electric power consumption is reduced because the temperature in the refrigerator is decreased. It does not rise extremely. In the rapid cooling operation mode, in the present embodiment, the refrigerator 10 for cooling is turned off.
It operates as N and cools the cold storage warehouse 8 by supplying cold heat to the cool air cooler 11. Depending on the load, the cooling refrigerator 10 may be turned off, but in the rapid cooling operation mode, it is necessary to lower the temperature in the refrigerated warehouse 8 anyway, and both the cooling air cooling 2 and the cooling air cooler 11 are operated. It is desirable to perform cooling.

When the internal temperature decreases to a predetermined temperature, the cooling is terminated and the cooling refrigerator 1 is stopped. The end time of the cooling is desirably around 18:00, as long as the temperature in the refrigerator 8 is at an optimum temperature for storing the object 4 to be cooled.

Thereafter, the cooling operation mode is entered, and the cooling object 10 is operated with the cooling refrigerator 10 and the cooling air cooler 11 kept ON according to the cooling operation pattern for the object 4 to be cooled, and the next morning in / out operation is performed. Is kept low until the start of the operation. At midnight, at a predetermined time, for example, at a time when the electricity rate becomes low after 22:00, the refrigerant circuit is switched, the cooling refrigerator 1 is turned on, and a heat storage operation pattern of storing heat in the heat storage tank 9 is performed. As shown in the electric power consumption of FIG. 5, the electric power consumption that becomes the heat storage operation pattern becomes the largest in one day, but in this case, a cooling device that is late-night electric power and can reduce the running cost as a whole is obtained. Then, the heat storage operation mode is performed until the entry / exit work of the next morning is started or the required amount of cold heat is stored in the heat storage tank 9.

As described above, in the present embodiment, the cold stored in the nighttime is used for condensing and radiating the cooling refrigerator 1 in the daytime cooling operation. Power consumption and power leveling. For this reason, the capacity of the equipment constituting the cooling device can be reduced. In addition, by switching the refrigerant circuit, each operation pattern of normal cooling operation, heat storage operation, and heat storage / radiation operation can be switched, and further provided with an operation pattern for performing a cooling operation with a small cooling capacity. And can operate efficiently in various ways. Since the refrigerant circuit is provided with the liquid receiver 1c, the increase and decrease in the required amount of refrigerant in the refrigerant circuit caused by the switching of the operation pattern is absorbed and adjusted by the liquid receiver 1c to improve the reliability of the cooling device. can do.

Further, since the cooling blower 3 is provided in the cold air passage in the refrigerated warehouse 8, the cooling efficiency of the object 4 to be cooled in the cooling process in the refrigerated warehouse 8 can be increased, and rapid cooling and uniform cooling can be realized. . Furthermore, since the circulation direction of the air circulation path is switched to the opposite direction during the operation, the object to be cooled 4 can be cooled more uniformly.

Further, since the refrigerator 10 having a small capacity is provided in the cooling operation pattern, frequent starting and stopping of the equipment as in the case of using a conventional large-capacity refrigerator can be prevented. The overall life can be kept long and reliability can be improved.

In the above, the air blown out from the cooling blower 3 in the refrigerated warehouse 8 is given directivity by the baffle plate / partition plate 6 to form an air circulation path. When the duct 3 itself has directivity, or when a duct is provided near the cooling blower 3, the air guide plate / partition plate 6 may not be provided. Also, a configuration has been described in which a differential pressure is generated on both sides of the object to be cooled 4 and a low-temperature air flow is formed by the differential pressure to cool the object to be cooled 4.
It is not limited to this. For example, a configuration may be made in which a cooling air blower 3 forms a circulation path of air using wind power, and circulates low-temperature air to cool the object 4 to be cooled. In this case, the cooling blower 3 is not limited to a blower capable of blowing air in a state where there is a differential pressure, so that the number of usable blowers increases. Further, the storage position of the article 4 to be cooled in the refrigerated warehouse 8 does not need to consider the differential pressure, and can be freely configured.

In the present embodiment, the object 4 to be cooled 4
The description has been made assuming that there is a hole as a vent hole. However, even when the object to be cooled 4 has no hole, air can flow around the object to be cooled. It goes without saying that the object to be cooled 4 is cooled.

The object 4 to be cooled in the refrigerated warehouse 8 according to the present embodiment is not limited to crops, but may be anything that needs to be kept cool at a predetermined temperature, such as boiled vegetables, fish,
It may be meat, a mold or the like.

The refrigerated warehouse 8 to be cooled is not limited to the present embodiment, but may be any space that stores the object 4 to be cooled. For example,
A closed space that is completely separated spatially by walls, a semi-closed space where some parts have openings such as doors, and sometimes open, and an air circulation path in the target space There is a semi-open space where a part of the space has an air path forming partition plate etc. to form it, an open space just partitioned by an air curtain etc., and there are differences in the effect size, but whatever Good.

In this embodiment, the refrigerated warehouse 8 to be cooled can be used for any purpose as long as it cools the object 4 to be cooled. A pre-cooled refrigerator for cooling before shipment, a showcase installed in a store, a brine cooling, various storages, and a large space such as a gymnasium for air conditioning can be considered.

In the present embodiment, the refrigerated warehouse 8 is
However, the cooling target space is not limited to one. The cooling air cooler 2 and the cooling blower 3 are provided in each space, and the heat transfer medium is provided for each cooling air. As long as it is distributed to the cooler 2, there may be any number. Further, the cooling air cooler 2 and the cooling blower 3 in the refrigerated warehouse 8 have been described as one example each, but a plurality of cooling air coolers are provided in the same target space, and all the cooling air coolers are provided. Air cooler is a blower for circulation 3
In the circulating air passage in the refrigerated warehouse 8 formed by
Any number of cooling air coolers may be used as long as the heat transfer medium is configured to be distributed in parallel from the cooling refrigerator 1 or the regenerator 9 to each cooling air cooler.

Embodiment 2 In the first embodiment, the stored heat is used for heat dissipation of the condenser.
Uses the refrigerant liquid in the refrigerant liquid pipe of the cooling refrigerator 1 for liquid subcooling. That is, the cold heat accumulated by making ice in the heat storage tank 9 is melted, and cold water is flown by a pump through a heat exchanger provided in a refrigerant liquid pipe flowing into the cooling air cooler 2, and the refrigerant liquid is cooled during the rapid cooling operation. Used to improve the capacity during rapid cooling operation by supercooling.

FIG. 6 is a circuit configuration diagram showing a heat storage operation pattern of the cooling device according to the present embodiment. FIG. 7 shows a heat storage heat dissipation operation pattern of the cooling device according to the present embodiment, in which chilled water is supercooled. FIG. 3 is a circuit configuration diagram of FIG.

In FIG. 6, the outlet of the refrigerant compressor 1a is
The refrigerant circuit switching device 1f is connected to the air-cooled condenser 1b via a stop valve 1j, and the inlet of the liquid receiver 1c is connected to the air-cooled condenser 1b by a refrigerant pipe. That is, in the first embodiment, there is a pipe that circulates from the refrigerant compressor 1a through the heat storage tank 9 to the inlet of the liquid receiver 1c, but in the present embodiment,
The piping is unnecessary. 21 is a chilled water pump, 22 is a heat exchanger, here a liquid subcooler. The other members are the same as those in the first embodiment, and a description thereof will be omitted.

Hereinafter, a heat storage operation pattern in the cooling device according to the present embodiment will be described with reference to FIG. As shown in the figure, the refrigerant circuit switching devices 1f, 12, 16 are opened, and the refrigerant circuit switching device 17 is closed. Refrigerant compressor 1
The refrigerant gas compressed in a passes through the check valve 1e, the refrigerant circuit switching device 1f, and the stop valve 1j, and is condensed in the air-cooled condenser 1b. The condensed and liquefied refrigerant passes through the check valve 1h and the stop valve 1k and accumulates in the liquid receiver 1c. The accumulated refrigerant liquid is supplied to the stop valve 11, the dust removal device 1 n, the accumulator 1 d,
It flows to the heat storage tank 9 through the refrigerant circuit switching device 12, the check valve 15, and the expansion valve 14 through the liquid outlet side pipe 7c. The refrigerant liquid evaporates in the heat storage tank 9, takes heat from the water in the heat storage tank 9, converts the water into ice, and stores the heat. Thereafter, the refrigerant gas evaporated in the heat storage tank 9 flows through the refrigerant circuit switching device 16, the suction pipe 7d, flows to the stop valve 1m, and returns to the compressor 1a via the accumulator 1d. At this time, the cold water pump 21 has stopped.

FIG. 7 is a circuit diagram showing a heat storage heat dissipation operation pattern utilizing the stored cold heat. In the heat storage / radiation operation pattern according to the present embodiment, the air-cooled condenser 1b of the cooling refrigerator 1 is also operated, and the refrigerant is circulated as in the normal cooling operation pattern in the first embodiment. That is, the cooling refrigerator 1 is operated to supply the cooling air to the cooling air cooler 2. Refrigerant circuit switching device 1f
Is opened, the refrigerant circuit switching devices 12 and 16 are closed, and the refrigerant circuit switching device 17 is opened. The high-temperature and high-pressure refrigerant gas compressed by the refrigerant compressor 1a flows into the air-cooled condenser 1b, and the condenser air blower 1b1 of the air-cooled condenser 1b is operated to pass outside air to the condenser heat exchanger 1b2 to condense. The condensed and liquefied refrigerant passes through the check valve 1h and accumulates in the receiver 1c.

The refrigerant flowing out of the liquid receiver 1c is supplied to the stop valve 1
l, the heat passes through the supercooling coil of the accumulator 1d through the dust removing device 1n, and is cooled by heat exchange. Then, the liquid is sent to the refrigerant circuit switching device 17 and the electronic expansion valve 18 through the liquid outlet side pipe 7c. The high-pressure refrigerant liquid is reduced to a low-pressure pressure by the electronic expansion valve 18 and evaporates while cooling the refrigerated warehouse 8 by the cooling air cooler 2. The refrigerant gas evaporates and passes through the suction pipe 7d, and accumulator 1
d, Return to the refrigerant compressor 1a.

On the other hand, the chilled water pump 21 is operated, and the chilled water obtained by thawing in the heat storage tank 9 is sent to the liquid subcooler 22.
Exchange heat with refrigerant liquid. Here, the cold water heated by the heat exchange returns to the heat storage tank 9 again. For this reason, the liquid supercooler 22 is drawn out of the cooling refrigerator 1 and passes through the liquid outlet side pipe 7c.
The refrigerant that has flown into the cooling air cooler 2 through the electronic expansion valve 18 undergoes supercooling with cold water from the heat storage tank 9, increases latent heat, and flows therethrough. As described above, the liquid is cooled by the liquid subcooler 22, and the latent heat is increased, thereby increasing the cooling capacity.

In this embodiment, since the cooling refrigerator 1 is also operated according to the heat storage / radiation operation pattern, the utilization time of the stored cold heat can be extended. In the first embodiment, it is necessary to switch to the normal cooling operation in which the air-cooled condenser 1b is operated by ending the use of the cold heat stored in the heat-storage / radiation operation pattern during the rapid cooling operation mode. On the other hand, in the present embodiment, it is also possible to perform cooling in the heat storage / radiation operation pattern during the rapid cooling operation mode. Embodiment 1
As compared with the above, the refrigerant piping is simplified.

As described above, in the present embodiment as well, cold energy can be stored by using midnight electric power, and the cold heat stored in the daytime rapid cooling operation mode can be used. The cooling device can be made smaller than the capacity of the refrigerator in (1), the power rate is low, and the maximum power consumption is kept low.

Embodiment 3 In the first embodiment, the cooling device according to the present invention is shown as being used in a refrigerated warehouse for pre-cooling and cooling vegetables and foods. However, instead of pre-cooling, the cooling device according to the present invention is used as freezing heat storage. May be. FIGS. 8 and 9 show circuit configuration diagrams of the cooling device when used for freezing. In the present embodiment, the cold heat stored in the heat storage tank 9 using the late-night power is used for the subcooling of the condensate during the freezing operation. Unlike the case where it is used for pre-cooling, there is no cooling refrigerator. In the case of freezing, since the latent heat of the object to be cooled 4 at the time of completion of freezing is large, the cold storage 8
If the heat insulation is firm, the temperature of the object to be cooled 4 rarely rises once the freezing is completed. Therefore, a refrigerator for cooling is not required.

FIG. 8 is a circuit diagram showing the flow of the refrigerant in the heat storage operation pattern, and FIG. 9 is a circuit diagram showing the flow of the refrigerant in the heat storage / radiation operation pattern. The same or corresponding parts as those of the second embodiment are denoted by the same reference numerals, and description thereof will be omitted. The operation of the heat storage operation pattern in FIG. 8 is the same as that in FIG. 6 in the second embodiment, in which the refrigerant gas compressed by the refrigerant compressor 1a is condensed by the air-cooled condenser 1b, and the liquid receiver 1
c, through the accumulator 1d and the liquid outlet side pipe 7c, and introduced into the heat storage tank 9. The refrigerant liquid evaporates in the heat storage tank 9 to remove heat from the water in the heat storage tank 9 and convert the water into ice to store heat. At this time, the cold water pump 21 has stopped.

In the heat storage / radiation operation pattern shown in FIG. 9, the refrigerant circuit switching devices 12 and 16 are closed and the refrigerant circuit switching circuit 17 is opened. The chilled water pump 21 is operated to send the cold stored in the heat storage tank 9 to the liquid subcooler 22 via water. The refrigerant liquid condensed and liquefied by the cooling refrigerator 1 is supplied to the liquid subcooler 22.
And undergo supercooling with cold water. The supercooled refrigerant liquid passes through the refrigerant circuit switching device 17, the electronic expansion valve 18, and
The air is cooled by evaporating in the cooling air cooler 2. The air cooled by the cooling air cooler 2 is circulated in the refrigerated warehouse 8 by the cooling blower 3 to cool and freeze the object 4 to be cooled.

With the above configuration, in the present embodiment, heat can be stored in the heat storage tank 9 when the cooling refrigerator 1 is not operating, that is, when the nighttime electricity rate is low, and this heat storage is frozen. Since it can be used for operation, the capacity of the cooling refrigerator 1 can be selected to be small. For this reason, the basic contract power can be reduced, and a cooling device with a low power rate can be obtained.

In the heat storage / radiation operation shown in FIGS. 7 and 9, the piping is slightly complicated, but the heat exchange between the cold water obtained by thawing in the heat storage tank 9 and the refrigerant from the refrigerant compressor 1a is performed by the heat exchanger 22. Then, it may be configured to supply the cooling air cooler 2. In this case, as in the first embodiment, a heat storage / radiation operation using cold heat stored without operating the air-cooled condenser 1b and a normal cooling operation to operate the air-cooled condenser 1b are provided.

On the contrary, in the heat storage / radiation operation of FIG.
The refrigerant derived from the accumulator 1 d and flowing through the liquid outlet side pipe 7 c flows into the heat storage tank 9, the ice in the heat storage tank 9 is thawed, and the supercooled liquid is supplied to the cooling air cooler 2. May be. In this case, Embodiment 2,
3, the air-cooled condenser 1b is operated, and the heat storage tank 9 is operated.
Rapid cooling is performed by a heat storage heat dissipation operation that uses the cold heat stored in the supercooling. Compared with FIG. 3, it is not necessary to provide the normal cooling operation discharge pipe 7a for operating the air-cooled condenser 1b and the liquid inlet side pipe 7b, and the pipe is simplified.

[0066]

As described above, according to the first aspect of the present invention, the compressor, the condenser, and the accumulator are connected by pipes, and the inlet for introducing the heat transfer medium and the heat transfer medium are led out to the accumulator. A cooling refrigerator having an outlet, a heat storage tank for storing and releasing cold heat by ice making and melting, and cooling for supplying cold heat through a heat transfer medium to cool a target space storing an object to be cooled. A cooler, one is connected to the inlet of the accumulator, the other is a suction pipe connected to the heat storage tank and the cooler for cooling, respectively, one is connected to the outlet of the accumulator, and the other is a circuit switching device and an expansion valve. Connected to the heat storage tank via
Uses late-night power by providing a liquid outlet side pipe connected to the cooling cooler via the circuit switching device and the electronic expansion valve, and a liquid receiver provided in the pipe between the condenser and the accumulator The stored heat is used for cooling in the daytime, so that the capacity of each device can be reduced, and a cooling device that can reduce the power rate can be obtained.

According to the second aspect of the invention, the discharge pipe connecting the discharge side of the compressor and one side of the heat storage tank, the outlet side of the condenser and the inlet side of the liquid receiver and the other side of the heat storage tank. The heat transfer medium discharged from the compressor flows into the heat storage tank through the discharge pipe, and the heat is supplied to the heat storage tank by thawing, and the liquid is supplied to the receiver, the accumulator, and the liquid. By supplying cold heat to the cooling cooler through the outlet pipe, the heat stored using midnight power is used as condensing heat for daytime cooling, and the high pressure during operation is reduced to cool down There is an effect that a cooling device that can reduce power consumption at the beginning of operation, level power, and reduce the capacity of each device can be obtained.

According to the third aspect of the present invention, there is provided a heat exchanger for exchanging heat between cold heat obtained by thawing water by circulating water in the heat storage tank and a heat transfer medium flowing into the cooling cooler. This has the effect of using the heat stored using the midnight power for daytime cooling, thereby reducing the capacity of each device and obtaining a cooling device that can reduce the power rate.

According to the fourth aspect of the present invention, a cooling refrigerator having a capacity smaller than the capacity of the cooling refrigerator, and cooling heat supplied by the cooling refrigerator having a capacity smaller than the capacity of the cooling cooler. The cooling device that keeps the temperature of the target space in the cold storage, prevents the frequent start and stop of the equipment during the cold storage operation, and provides a cooling device that can maintain a long life and improve reliability. There is.

According to the fifth aspect of the present invention, the air blower provided in the target space and circulating the air cooled by the cooling cooler so as to apply a differential pressure to both sides of the object to be cooled is provided. In addition, uniform cooling and improvement in cooling efficiency can be achieved, and a cooling device capable of shortening the cooling time and reducing power consumption can be obtained.

According to the sixth aspect of the present invention, since the flow direction of the air circulation path in the target space can be switched between forward and reverse, a cooling device capable of further rapid cooling and uniform cooling can be obtained. .

According to the seventh aspect of the invention, by switching the refrigerant circuit, a heat storage operation in which the refrigerant is condensed in the condenser of the cooling refrigerator and evaporated in the heat storage tank, and a cooling cooler which is condensed in the heat storage tank and condensed. The operation pattern can be switched between a heat storage and heat dissipation operation that evaporates in the cooling refrigerator and a normal cooling operation in which the cooling cooler condenses in the condenser and evaporates in the cooling cooler. The provision of the operation pattern of the cold-holding operation in which the air cooler evaporates provides an effect of obtaining a cooling device that can be efficiently and variously operated depending on the case.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a normal cooling operation pattern of a cooling device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a heat storage operation pattern of the cooling device according to the first embodiment.

FIG. 3 is a circuit configuration diagram of a heat storage / radiation operation pattern of the cooling device according to the first embodiment.

FIG. 4 is a circuit configuration diagram of a cooling operation pattern of the cooling device according to the first embodiment.

FIG. 5 is an explanatory diagram showing a relationship among an operation mode, an internal temperature, and a power consumption according to the first embodiment.

FIG. 6 is a circuit configuration diagram of a heat storage operation pattern of a cooling device according to a second embodiment of the present invention.

FIG. 7 is a circuit configuration diagram of a heat storage / radiation operation pattern of the cooling device according to the second embodiment.

FIG. 8 is a circuit configuration diagram of a heat storage operation pattern of a cooling device according to a third embodiment of the present invention.

FIG. 9 is a circuit configuration diagram of a heat storage / radiation operation pattern of the cooling device according to the third embodiment.

FIG. 10 is a configuration diagram showing a conventional cooling device.

[Explanation of symbols]

Reference Signs List 1 Refrigerator for cooling, 1a Refrigerant compressor, 1b Air-cooled condenser, 1b1 Blower for condenser, 1b2 Heat exchanger for condenser, 1c Liquid receiver, 1d Accumulator, 1e Discharge check valve, 1f Refrigerant circuit switching device, 1g Refrigerant Circuit switching device, 1h liquid check valve, 1i liquid check valve, 1j stop valve, 1k stop valve, 1l stop valve, 1m stop valve, 1n
Dust removal device, 1p oil return device, 1q stop valve, 2
Cooling cooler, 3 Cooling blower, 4 Cooled object, 6
Baffle plate / partition plate, 7a discharge pipe, 7b liquid inlet side pipe, 7c liquid outlet side pipe, 7d suction pipe, 8 refrigerated warehouse, 9 heat storage tank, 10 refrigeration refrigerator, 11 refrigeration air cooler, 12 refrigerant Circuit switching device, 13 refrigerant circuit switching device, 14 expansion valve, 15 check valve, 16 refrigerant circuit switching device, 17 refrigerant circuit switching device, 18 electronic expansion valve, 19 refrigerant circuit switching device, 20 expansion valve, 21 chilled water pump , 22 heat exchanger.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Yamashita 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Seishi Yokoyama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd.

Claims (7)

[Claims] 1. A cooling refrigerator having a compressor, a condenser, and an accumulator connected by piping, and the accumulator having an inlet for introducing a heat transfer medium and an outlet for extracting the heat transfer medium, and ice making. And a heat storage tank for storing and radiating cold heat by melting ice, a cooling cooler supplied with cold heat through the heat transfer medium to cool a target space storing an object to be cooled, and one of which is an introduction of the accumulator. And the other is connected to the outlet of the accumulator, and the other is connected to the heat storage tank via a circuit switching device and an expansion valve. A liquid outlet side pipe connected to the cooling cooler via a circuit switching device and an electronic expansion valve, and a connection between the condenser and the accumulator. A cooling device, comprising: a liquid receiver provided on a pipe. 2. A discharge pipe connecting the discharge side of the compressor to one side of the heat storage tank, and a liquid inlet side pipe connecting the outlet side of the condenser and the inlet side of the liquid receiver to the other side of the heat storage tank. Wherein the heat transfer medium discharged from the compressor is allowed to flow into the heat storage tank through the discharge pipe, and the heat storage tank is provided with cold heat by thawing, and the liquid receiver, the accumulator,
The cooling device according to claim 1, wherein the cooling heat is supplied to a cooling cooler through a liquid outlet side pipe. 3. A heat exchanger for circulating water in a heat storage tank and exchanging heat between cold obtained by thawing and a heat transfer medium flowing into a cooling cooler. Cooling system. 4. A cooling refrigerator having a capacity smaller than the capacity of the cooling refrigerator, and a cooling heat supplied by the cooling refrigerator having a capacity smaller than the capacity of the cooling cooler to reduce the temperature of the target space. The cooling device according to any one of claims 1 to 3, further comprising: a cooler for keeping cool. 5. A blower provided in a target space and circulating air cooled by a cooling cooler so as to apply a differential pressure to both sides of an object to be cooled. Item 5. The cooling device according to any one of items 4. 6. The cooling device according to claim 5, wherein the flow direction of the air circulation path in the target space can be switched between forward and reverse. 7. A heat storage operation in which a refrigerant circuit is switched to condense in a condenser of a cooling refrigerator and evaporate in a heat storage tank, and a heat storage heat radiation operation in which the heat is condensed in the heat storage tank and evaporated in a cooling cooler. It is possible to switch each operation pattern between a normal cooling operation in which the condenser of the cooling refrigerator condenses and evaporates in the cooling cooler, and further condenses in the cooling refrigerator and evaporates in the cooling refrigerator. The cooling device according to any one of claims 4 to 6, further comprising an operation pattern of a cooling operation to be performed.