JPH11337191A - Heat storage chiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat storage chiller in which power consumption can be reduced efficiently and economically through simple arrangement while suppressing fluctuation of load at the time of peak power. SOLUTION: The heat storage chiller has a normal refrigeration cycle comprising a compressor 401, a condenser 402, a first expansion valve 202 and an evaporator 203, a heat storage refrigeration cycle comprising the compressor 401, the condenser 402, a second expansion valve 206, a heat exchanger 207 for heat storage material and a suction pressure regulation valve 500, and a liquefaction refrigerant circulation cycle comprising a circulation pump 211 for liquefaction refrigerant, the heat exchanger 207 for heat storage material and the evaporator 203. When refrigeration load is reduced in cold storage operation mode, the suction pressure regulation valve 500 is opened and cold is stored in a heat storage material 214. In liquefaction refrigerant circulation operation mode, liquefaction refrigerant is circulated by a liquefaction refrigerant circulation pump and cold heat stored in the heat storage material 214 is discharged in the evaporator 203. Since the compressor 401 and a condenser tan 404 can be stopped in that operation mode, power consumption can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus used for cooling a refrigerating showcase or the like installed in a store or the like. It concerns the device.

[0002]

2. Description of the Related Art In recent years, the demand for electric power has been concentrated particularly during the daytime in summer, and it is an industry problem to reduce the maximum electric power demand efficiently and economically in order to reduce the electric power consumption at the peak time. there were. In order to solve this problem, various regenerative refrigeration systems as described above have been developed. Here, a conventional regenerative refrigerator of this type is disclosed in
The one disclosed in JP-A-133661 is known. This conventional regenerative refrigerator will be described with reference to FIG. FIG. 5 is a refrigerant circuit diagram illustrating a refrigeration cycle of a conventional regenerative refrigerator.

The regenerative refrigeration system 1 has a plurality of refrigeration systems 2 and an ice heat storage tank 20 common to each refrigeration system 2. Each refrigerating device 2 sequentially connects a compressor 5, a condenser 6, a first solenoid valve 7, a first expansion valve 8, and the evaporator 4 to an evaporator 4 arranged in a refrigerating showcase 3 serving as a load. It has a normal refrigeration cycle. A condenser fan 9 is installed in the vicinity of the condenser 6 to cool the condenser 6 at a high temperature. In addition, from the condenser 6, the second solenoid valve 10, the second expansion valve 11, the water heat exchanger 1
A cycle in which the two- and three-way switching valve 13 and the compressor 5 are sequentially connected is provided, and the second solenoid valve 10 and the second
A third solenoid valve (14) is provided to bypass the series circuit composed of the expansion valve (11). Further, the three-way switching valve 13 is connected to the first expansion valve 8 side of the first solenoid valve 7.
The water heat exchanger 12 of each refrigerating device 2 is provided with a common ice heat storage tank 2.
0, and a medium such as oil is circulated by driving the pump 15 to exchange heat with water stored in the ice heat storage tank 20.

With such a configuration, during normal refrigeration operation, the first solenoid valve 7 is opened, and the second solenoid valve 10 and the third solenoid valve 10 are opened.
The inside of the refrigeration showcase 3 is cooled by closing the solenoid valve 14 and operating each compressor 5 to form a normal refrigeration cycle. In the heat storage operation, the second electromagnetic valve 10 is opened, the first electromagnetic valve 7 and the third electromagnetic valve 14 are closed, and the compressor 5 is operated to store cold heat in the ice heat storage tank 20. Furthermore, during the heat storage operation, the third
The solenoid valve 14 is opened, and the first solenoid valve 7 and the second solenoid valve 10
Is closed, the three-way switching valve 13 is switched and controlled, the compressor 5 is operated, and the condenser fan 9 is stopped. As a result, the refrigerant from the compressor 5 is not condensed in the condenser 6 but condensed in the water heat exchanger 12, and then passes through the three-way switching valve 13, where the first expansion valve 8, the evaporator 4, and the compressor A cycle of circulating 5 is formed. That is, during the heat storage take-out operation, the power consumption is reduced by stopping the driving of the condenser fan 9.

[0005]

However, in the conventional refrigeration system, the power consumption is not sufficiently reduced because the compressor 5 that consumes relatively large power is driven even during the cold storage operation.

In a conventional refrigeration system, an ice heat storage tank 20 is provided.
At the time of the heat storage operation for storing heat in the refrigerator 3
Can not be cooled inside. Therefore, in order to cool the inside of the showcase, switching control of an appropriate solenoid valve (for example,
For example, control for switching between the cold storage operation and the normal operation must be performed every hour, and this control is complicated. In addition, the first solenoid valve 7 and the second solenoid valve 1
A combined operation in which the normal operation and the cold storage operation are simultaneously performed by opening 0 and closing the third solenoid valve 14 is also disclosed. In this case, the refrigeration load in the refrigeration showcase 3 is high. Regardless of whether the load is low or low, both the evaporator 4 and the water heat exchanger 12 are cooled.
For this reason, when the load is low, either the evaporator 4 or the water heat exchanger 12 may be excessively cooled, causing wasteful power consumption. On the other hand, when the load is high, the showcase may be insufficiently cooled.

Further, in the conventional refrigeration system, the ice heat storage tank 2
0 is required, and it is difficult to reduce the size.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat storage device capable of efficiently and economically reducing power consumption and having a load change at a power peak time with a simple configuration. An object of the present invention is to provide a refrigerating apparatus.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a heat storage material is provided, and refrigerant is sequentially supplied to a compressor, a condenser, a first expansion device, a cooler, and the compressor. A normal refrigeration cycle to circulate, and the compressor,
The condenser, the second expansion device, a heat storage refrigeration cycle that sequentially circulates through the heat storage material heat exchanger and the compressor and a heat storage refrigeration device that aims to shift the peak of power consumption,
A liquefied refrigerant circulation cycle for circulating the liquefied refrigerant to a heat storage material heat exchanger and a cooler by providing a liquefied refrigerant circulation pump is proposed.

According to the present invention, in the heat storage refrigeration cycle, the heat exchanger for the heat storage material can be cooled and cold heat can be stored in the heat storage material. In the liquefied refrigerant circulation cycle, since the liquefied refrigerant circulates through the heat storage material heat exchanger and the evaporator by the circulation pump, the cold stored in the heat storage material heat exchanger is radiated by the evaporator via the refrigerant. be able to. In this case, the compressor does not need to be driven, and the circulating pump capacity (output) may be much smaller than that of the compressor. Further, the power consumption is small, so that the power consumption is reduced in the liquefied refrigerant circulation cycle. Can be achieved.

According to a second aspect of the present invention, in the regenerative refrigerating apparatus according to the first aspect, a suction pressure adjusting valve is connected in series between the heat exchanger for heat storage material and the compressor in the heat refrigerating cycle. It is proposed that the suction pressure control valve be connected to be opened when the refrigerant pressure on the compressor side becomes equal to or lower than a predetermined set pressure.

According to the present invention, when the suction side pressure of the compressor in the normal refrigeration cycle becomes equal to or less than the set pressure due to reduction of the refrigeration load, the suction pressure regulating valve is opened.
Thereby, a heat storage refrigeration cycle is formed in parallel with the normal refrigeration cycle. When the suction side pressure of the compressor in the normal refrigeration cycle becomes larger than the set pressure due to an increase in the refrigeration load or the like, the suction pressure regulating valve closes. Thereby, the heat storage refrigeration cycle is shut off, and only the normal refrigeration cycle is formed. Therefore, it is possible to efficiently store the cold heat in the heat storage material while maintaining the cooling of the cooler by the normal refrigeration cycle according to the increase or decrease of the refrigeration load.

According to a third aspect of the present invention, in the regenerative refrigeration system according to the first aspect, the heat storage material, the first expansion device, the cooler, the second expansion device, the heat storage material heat exchanger, and the circulation pump are provided. And a compressor unit having a compressor unit having the compressor and the condenser.

Further, the invention of claim 4 proposes a regenerative refrigerating apparatus according to claim 3, wherein a plurality of the cooler units are connected to a common compressor unit.

According to the third and fourth aspects of the present invention, since the heat storage material is built in the cooler unit, the space can be efficiently used, and when the cooler unit is installed, piping work around the heat storage material is performed. The workability is improved without the need. In addition, since the compressor unit having the compressor and the condenser is also used for a normal non-heat storage type refrigerator such as the present invention, it is possible to share a compressor unit with a normal non-heat storage type refrigeration apparatus. it can. Thereby, cost reduction and improvement of workability can be achieved.

Further, according to a fifth aspect of the present invention, in the regenerative refrigerating apparatus according to the fourth aspect, a heat storage material heat exchanger of each of the plurality of cooler units and a compressor of the compressor unit are provided. It is proposed that a common suction pressure adjusting valve is connected in series, and the suction pressure adjusting valve is opened when the refrigerant pressure on the compressor side becomes equal to or lower than a predetermined set pressure.

According to the present invention, since the heat storage material heat exchanger in each cooler unit is connected to the common suction pressure regulating valve, the heat storage refrigeration cycle is performed when the refrigeration load in each cooler unit is reduced. It is formed. Thereby, it becomes possible to efficiently store the cold heat in the heat storage material according to the increase or decrease of the refrigeration load in the total cooler unit.

According to a sixth aspect of the present invention, in the regenerative refrigeration system of the second aspect, the heat storage material, the first expansion device, the cooler, the second expansion device, the heat storage material heat exchanger, the circulation pump, The present invention proposes a configuration in which a cooler unit having a suction pressure regulating valve is connected to a compressor unit having the compressor and the condenser.

According to the present invention, since the heat storage material is incorporated in the cooler unit, the space can be efficiently used, and when the cooler unit is installed, piping work around the heat storage material is not required, and workability is improved. I do. In addition, since the compressor unit having the compressor and the condenser is also used for a normal non-heat storage type refrigerator such as the present invention, it is possible to share a compressor unit with a normal non-heat storage type refrigeration apparatus. it can. Thereby, cost reduction and improvement of workability can be achieved.

Furthermore, the invention of claim 7 proposes the regenerative refrigerating apparatus of claim 6, wherein a plurality of the cooler units are connected to a common compressor unit.

According to the present invention, since the heat exchanger for heat storage material in each cooler unit is connected to the common suction pressure regulating valve, the heat storage refrigeration cycle is performed when the refrigeration load on each cooler unit is reduced. It is formed. Thereby, it becomes possible to efficiently store the cold heat in the heat storage material according to the increase or decrease of the refrigeration load in the total cooler unit. In particular, since the set pressure of the suction pressure regulating valve can be set for each cooler unit, a cooler unit that preferentially stores the heat storage material can be set.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A regenerative refrigeration apparatus according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a refrigerant circuit diagram illustrating a refrigeration cycle of a regenerative refrigeration apparatus. In the present embodiment, a regenerative refrigeration system used in a store such as a supermarket will be described.

The regenerative refrigeration system 100 includes a plurality (for example, two) of chiller units 200 and 300, which are refrigeration showcases installed in a store, and a compressor installed outdoors or in a backyard of the store. It is provided with a unit 400 and a suction pressure adjusting valve 500. Since the cooler units 200 and 300 have the same configuration, only the former will be described here.

The cooler unit 200 is provided between the output side and the input side pipe of the compressor unit 400 and the first solenoid valve 20.
1, a first expansion valve 202 as a throttle device, an evaporator 203 as a cooler, and a second solenoid valve 204 are sequentially connected in series. In parallel with this, the third solenoid valve 205, the second expansion valve 206, the heat storage material heat exchanger 207, the fourth solenoid valve 208
Are connected in series to the input pipe of the compressor unit 400 via the suction pressure regulating valve 500. Further, the heat storage material heat exchanger 207 and the fourth solenoid valve 20
8, the fifth solenoid valve 209 and the first check valve 210
Is connected between the first expansion valve 202 and the evaporator 203. Here, the first check valve 2
Numeral 10 is connected so that the refrigerant flows from the heat storage material heat exchanger 207 to the evaporator 203. Furthermore, evaporator 2
03 and the second solenoid valve 204, a series circuit including the liquefied refrigerant circulation pump 211, the second check valve 212, and the sixth solenoid valve 213 is connected to the second expansion valve 206 and heat exchange for the heat storage material. Connected to the container 207. Here, the second check valve 212 is connected to the heat storage material heat exchanger 20 from the evaporator 203 side.
It is connected so that the refrigerant flows to the 7 side. The opening and closing of the first solenoid valve 201 is controlled by a temperature detecting means (not shown) such as a thermostat installed in the showcase. Control for closing the first solenoid valve 201 is performed in order to prevent this. In addition, the first solenoid valve 201
Opening / closing control as described later is performed separately from the temperature detecting means.

A heat storage material 214 is provided in the vicinity of the heat storage material heat exchanger 207 so that heat exchange with the heat storage material heat exchanger 207 is possible. Here, as the heat storage material 214,
One that freezes at a temperature approximately equal to the evaporator temperature in the normal operation mode described later, or an antifreeze solution is used.

The compressor unit 400 has a compressor 401, a condenser 402, and a liquid receiver 403 connected in series in order. A condenser fan 404 is provided near the condenser 402, and a condenser fan 404 is provided. Forced cooling by air is attempted. A pressure switch (not shown) is attached to the suction side pipe of the compressor 401, and when the suction side pressure of the compressor 401 becomes equal to or lower than a predetermined set pressure, the refrigeration load in the cooler units 200 and 300 is reduced. And the compressor 401 stops driving. At this time, the drive of the condenser fan 404 also stops in conjunction with the compressor 401.

With such a configuration, the regenerative refrigeration system 1
00 can perform a refrigeration operation in the following four operation modes. The four operation modes are a normal operation mode, a cold storage operation mode mainly operated at night when the power demand is small and the power cost is small, a liquefied refrigerant circulation operation mode mainly operated during the day when the power demand peaks, and the cold storage operation. This is a shift operation mode from the mode to the liquefied refrigerant circulation operation mode. Hereinafter, the operation in each operation mode will be described.

First, the normal operation mode will be described.
In the normal operation mode, the first solenoid valves 201 and 301 are controlled to open and close based on the thermostat, and the second solenoid valves 204 and 304 and the fourth solenoid valves 208 and 308 are opened.
Third solenoid valves 205 and 305, fifth solenoid valves 209 and 30
9. The sixth solenoid valves 213 and 313 are closed. This allows
The refrigerant is supplied to the first solenoid valves 201 and 301, the first expansion valve 202,
302, evaporators 203 and 303, second solenoid valves 204 and 3
04, a compressor 401, a condenser 402, and a liquid receiver 403 are sequentially formed to form a normal refrigeration cycle (see a solid arrow in FIG. 1). In this normal operation mode, the compressor 4
01 and the condenser fan 404,
The refrigerant circulates to cool the evaporators 203 and 303, thereby cooling each showcase. At this time, the first solenoid valve 201 is controlled so that the temperature in each showcase is maintained at a predetermined temperature.
And 301 are controlled to open and close by the temperature detecting means (not shown). Also, both first solenoid valves 201 and 301
Is closed, the suction-side pressure of the compressor 401 decreases, so that the compressor 401 and the condenser fan 404 stop driving by controlling a pressure switch (not shown). As described above, each of the cooler units 200 and 300 can keep the inside of each showcase cooled to a predetermined temperature.
Note that the fourth solenoid valves 208 and 308 may be closed.

Next, the cold storage operation mode will be described.
In this cold storage operation mode, the first solenoid valves 201 and 301 are controlled to open and close based on the thermostat, the second solenoid valves 204 and 304, the third solenoid valves 205 and 305, and the fourth solenoid valves 208 and 308 are opened. 5 solenoid valves 209, 30
9. The sixth solenoid valves 213 and 313 are closed. As a result, the normal refrigeration cycle is formed, and the third solenoid valves 205 and 305, the second expansion valves 206 and 306, the heat storage material heat exchangers 207 and 307, and the fourth solenoid valves 208 and 30 are formed.
8, suction pressure regulating valve 500, compressor 401, condenser 40
2. A heat storage refrigeration cycle called a liquid receiver 403 is formed (see a white arrow in FIG. 1). Here, the suction pressure regulating valve 5
00 in the normal operation mode when the first solenoid valves 201 and 301 are opened.
01 is set slightly lower than the suction side pressure. In this cold storage operation mode, when the refrigerating load of each of the cooler units 200 and 300 is high and both the first solenoid valves 201 and 301 are opened, the suction pressure regulating valve 500 is closed and the heat storage material heat is released. The refrigerant does not flow through the exchangers 207 and 307, and therefore, the cold heat is not stored in the heat storage materials 214 and 314. When one or both of the cooler units 200 and 300 are cooled, the first solenoid valve 201 or 30
1 is closed, and the pressure of the suction pressure regulating valve 500 on the compressor 401 side decreases. Then, the suction pressure adjusting valve 500 is opened, so that the refrigerant flows through the heat storage material heat exchangers 207 and 307, and cool heat is stored in the heat storage materials 214 and 314.
That is, one or both of the cooler units 200 or 3
The excess refrigeration capacity resulting from the reduction in the load at 00 is used to store cold heat in the heat storage materials 214 and 314. Thereby, it is possible to efficiently and efficiently maintain the cooling capacity of the cooler units 200 and 300, and store the cold of the heat storage materials 214 and 314.

Next, a shift operation mode, which is an operation mode for shifting from the cold storage operation mode to a liquefied refrigerant circulation operation mode described later, will be described. In this shift operation mode, the second solenoid valves 204 and 304, the fourth solenoid valve 20
8, 308 are closed, the first solenoid valves 201, 301,
The solenoid valves 205 and 305, the fifth solenoid valves 209 and 309, and the sixth solenoid valves 213 and 313 are opened to drive the compressor 401. As a result, the liquefied refrigerant accumulates in the pipes of the evaporators 203 and 303 and the heat storage material heat exchangers 207 and 307. The shift operation mode may be ended when a predetermined amount of liquefied refrigerant has accumulated or when the operation has been performed for a predetermined time, and may be shifted to a liquefied refrigerant circulation operation mode described later.

Next, the liquefied refrigerant circulation operation mode will be described. In this operation mode, the first solenoid valves 201, 30
Reference numeral 1 denotes a state where the thermostat is not opened and closed and is always closed, and the second solenoid valves 204 and 304 and the third solenoid valves 205 and 3
05, the fourth solenoid valves 208 and 308 are closed, the fifth solenoid valves 209 and 309 and the sixth solenoid valves 213 and 313 are opened,
The liquefied refrigerant circulation pumps 211 and 311 are driven, and the compressor 401 and the condenser fan 404 are stopped. As a result, the liquefied refrigerant is transferred to the heat storage material heat exchangers 207 and 307 and the fifth heat exchanger.
Solenoid valves 209, 309, first check valves 210, 310, evaporators 203, 303, liquefied refrigerant circulation pumps 211, 3
11, second check valves 212 and 312, sixth solenoid valve 213,
A liquefied refrigerant circulation cycle is formed that sequentially flows through the heat exchanger 313 and the heat storage material heat exchangers 207 and 307 (see the dotted arrow in FIG. 1). That is, in the shift operation mode described above, the evaporators 203 and 303 and the heat exchangers 207 and 30 for heat storage materials are used.
7 circulates the liquefied refrigerant stored in the evaporators 203 and 303.
Is to dissipate heat. Therefore, in this operation mode,
Compressor 401 and condenser fan 4 with relatively large power consumption
It is not necessary to drive the power supply 04, and it is sufficient to operate the liquefied refrigerant circulation pumps 211 and 311 with low power consumption, so that the power consumption can be reduced as a whole.

As described above, in the regenerative refrigerating apparatus 100 according to the present embodiment, in the liquefied refrigerant circulating operation mode, it is not necessary to drive the compressor or the condenser fan, so that the power consumption can be reduced. In the cold storage operation mode for accumulating cold heat in the heat storage material, the heat storage refrigeration cycle is formed in parallel with the normal refrigeration cycle when the load on the compressor in the normal refrigeration cycle is reduced. It is possible to efficiently cool the heat storage material while maintaining the refrigeration operation in the unit. Further, since the heat storage material is arranged in the cooler unit, the space can be effectively used, and when the cooler unit is installed, piping work around the heat storage material is not required, thereby improving workability. Also, since a compressor unit having a compressor and a condenser is also used in a non-heat storage type ordinary unit as in the present invention,
The compressor unit can be shared with a normal refrigeration device that is not a heat storage type. Thereby, cost reduction and improvement of workability can be achieved.

(Second Embodiment) A regenerative refrigeration apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a refrigerant circuit diagram illustrating a refrigeration cycle of the regenerative refrigeration apparatus. In the drawings, the same members corresponding to FIG. 1 are denoted by the same reference numerals.

The regenerative refrigeration system 100 differs from that of the first embodiment in that suction pressure regulating valves 230 and 330 are arranged in each of the cooler units 200 and 300 as shown in FIG. It is in. Here, the set pressure of each suction pressure adjusting valve 230 and 330 may be the same as that of the suction pressure adjusting valve 500 according to the first embodiment.

With this configuration, the number of pipes connecting the compressor unit 400 and the respective cooler units 200 and 300 can be reduced, so that workability is improved. Further, each suction pressure adjusting valve 230 and 330
If the set pressures are different, the cooler unit 200 or 300 that starts the heat storage operation to the heat storage material preferentially
Can be set. That is, the heat storage operation of the cooler unit having the suction pressure adjusting valve having the higher set pressure is performed with priority over the other cooler units. Other operations and effects are the same as those of the first embodiment.

(Third Embodiment) A regenerative refrigeration apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a refrigerant circuit diagram illustrating a refrigeration cycle of the regenerative refrigeration apparatus. In the drawings, the same members corresponding to FIG. 1 are denoted by the same reference numerals.

The point that the regenerative refrigeration system 100 differs from that of the first embodiment is that a liquefied refrigerant recovery circuit 220 is provided in order to quickly shift from the liquefied refrigerant circulation operation mode to the normal operation mode. On the point.

As shown in FIG. 3, the liquefied refrigerant recovery circuit 220 includes a branch point A which branches from between the evaporator 203 and the second solenoid valve 204 to the liquefied refrigerant circulation pump 211, and a suction side of the compressor 401. And a series circuit in which a first capillary pipe 221 having a throttle action, a third check valve 222, and a seventh solenoid valve 223 are sequentially connected. A second capillary having a throttling function is provided between a branch point B where the fifth solenoid valve 209 branches from between the heat storage material heat exchanger 207 and the fourth solenoid valve 208 and the suction side of the compressor 401. Tube 2
24, a fourth check valve 225 and a series circuit in which the seventh solenoid valve 223 is sequentially connected.

With such a configuration, it is possible to perform the liquefied refrigerant recovery operation mode in order to quickly shift from the liquefied refrigerant circulation operation mode to the normal operation mode.
In the liquefied refrigerant recovery operation mode, only the seventh solenoid valve 223 is opened, all other solenoid valves are closed, and the compressor 401
Drive. As a result, the liquefied refrigerant flowing through the evaporator 203 and the heat storage material heat exchanger 207 in the liquefied refrigerant circulation operation mode becomes refrigerant gas through the first capillary tube 221 and the second capillary tube 224 and becomes a compressor. It flows into 402. If this operation mode is terminated when the liquefied refrigerant in the evaporator 203 or the heat storage material heat exchanger 207 is exhausted, the normal refrigeration cycle can be formed and the operation can be performed in the normal operation mode.

As described above, according to the regenerative refrigerating apparatus according to the present embodiment, the liquefied refrigerant circulating operation mode in the first embodiment can be quickly shifted to the normal operation mode. Other functions and effects are the same as those of the first embodiment.

As shown in FIG. 4, the suction pressure regulating valve 230 may be provided with the cooler unit 200. In this case, the same operation and effect as those described in the second embodiment can be obtained.

In the first to third embodiments, the compressor is driven and stopped in accordance with the refrigeration load based on the pressure switch. It may correspond to a refrigeration load. Further, the number of cooler units is not limited to two, and may be another number.

[0043]

As described in detail above, if the liquefied refrigerant circulation cycle is formed and operated when cold heat is stored in the heat storage material, it is not necessary to drive the compressor and the condenser fan, so that power consumption is reduced. Can be reduced.

Further, since a suction pressure control valve is connected in series between the heat storage material heat exchanger and the compressor in the regenerative refrigerating cycle, the compressor in the normal refrigerating cycle is reduced by reducing the refrigerating load and the like. When the suction side pressure falls below the set pressure, the suction pressure regulating valve opens. When the suction side pressure of the compressor in the normal refrigeration cycle becomes larger than the set pressure due to an increase in the refrigeration load or the like, the suction pressure regulating valve closes. Therefore, when the refrigeration load is large, only the cooling of the cooler by the normal refrigeration cycle is performed, and when the refrigeration load becomes small and the cooling of the cooler by the normal refrigeration cycle becomes unnecessary, the heat storage refrigeration cycle is performed in parallel with the normal refrigeration cycle. Is formed. That is, it is possible to efficiently accumulate cold heat in the heat storage material while maintaining cooling of the cooler according to the refrigeration load, and it becomes unnecessary to perform complicated control according to the refrigeration load. In particular, when a plurality of cooler units are provided, it is possible to efficiently store cold heat in the heat storage material according to the increase or decrease of the refrigeration load in all the cooler units.

Therefore, during the daytime in summer when power demand is concentrated, the liquefied refrigerant circulation cycle is formed to reduce power consumption, and at night when the electricity rate is low, a heat storage refrigeration cycle is formed to store heat into the heat storage material. Heat storage can be achieved. In addition, since the cooling of the cooler in the cooler unit can be maintained during the heat storage, it is particularly suitable for a store or the like that operates for 24 hours.

Further, since the heat storage material is incorporated in the cooler unit, the space can be efficiently used, and when the cooler unit is installed, piping work around the heat storage material is not required, thereby improving workability. In addition, since the compressor unit having the compressor and the condenser is also used for a normal non-heat storage type refrigerator such as the present invention, it is possible to share a compressor unit with a normal non-heat storage type refrigeration apparatus. it can. Thereby, cost reduction and improvement of workability can be achieved.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram illustrating a refrigeration cycle of a regenerative refrigerating apparatus according to a first embodiment.

FIG. 2 is a refrigerant circuit diagram illustrating a refrigeration cycle of a regenerative refrigeration apparatus according to a second embodiment.

FIG. 3 is a refrigerant circuit diagram illustrating a refrigeration cycle of a regenerative refrigeration apparatus according to a third embodiment.

FIG. 4 is a refrigerant circuit diagram illustrating a refrigeration cycle of a regenerative refrigeration apparatus according to another example of the third embodiment.

FIG. 5 is a refrigerant circuit diagram illustrating a refrigeration cycle of a conventional regenerative refrigerator.

[Explanation of symbols]

 100: regenerative refrigerator, 200, 300: cooler unit, 201, 301: first solenoid valve 202, 302 ... expansion valve 203, 303 ... evaporator 204, 304 ... second solenoid valve 205, 305: third solenoid Valves 206, 306 Second expansion valves 207, 307 Heat exchangers for heat storage materials 208, 308 Fourth solenoid valves 209, 309 Fifth solenoid valves 210, 310 First check valves 211, 311 Liquefied refrigerant Circulating pumps 212 and 312 second check valves 213 and 313 sixth electromagnetic valves 214 and 314 heat storage materials 220 and 320 liquefied refrigerant recovery circuit 221 first capillary tube 222 third check valve 223 7 solenoid valve 224 ... second capillary tube 225 ... fourth check valve 230,330 ... suction pressure adjusting valve 400 ... compressor unit 401 ... compressor 402 ... condenser 403 ... receiver Vessel 404 ... condenser fan 500 ... suction pressure regulating valve

Claims (7)

[Claims] 1. A storage device comprising a heat storage material, wherein a refrigerant, a compressor, a condenser,
A first refrigeration cycle for sequentially circulating the first expansion device, the cooler and the compressor, and the refrigerant, the compressor, the condenser,
A regenerative refrigerating apparatus that has a second expansion device, a heat storage material heat exchanger, and a regenerative refrigerating cycle that sequentially circulates through the compressor to achieve a peak shift in power consumption, comprising a circulating pump for liquefied refrigerant. A regenerative refrigeration system having a liquefied refrigerant circulation cycle for circulating the liquefied refrigerant to a heat storage material heat exchanger and a cooler. 2. A suction pressure control valve is connected in series between the heat storage material heat exchanger and the compressor in the heat storage refrigeration cycle, and the suction pressure control valve has a predetermined refrigerant pressure on the compressor side. 2. The regenerative refrigerating apparatus according to claim 1, wherein the refrigerating apparatus is opened when the pressure becomes equal to or lower than a set pressure. 3. A cooling unit having the heat storage material, a first expansion device, a cooler, a second expansion device, a heat storage material heat exchanger and a circulation pump, and a compressor unit having the compressor and the condenser. 2. The regenerative refrigeration system according to claim 1, wherein the regenerative refrigeration system is configured to be connected. 4. The regenerative refrigeration system according to claim 3, wherein a plurality of said cooler units are connected to a common compressor unit. 5. A common suction pressure adjusting valve is connected in series between each heat storage material heat exchanger of the plurality of cooler units and a compressor of the compressor unit, and the suction pressure adjusting valve is 5. The regenerative refrigerating apparatus according to claim 4, wherein the refrigerating apparatus is opened when the refrigerant pressure on the compressor side becomes equal to or lower than a predetermined set pressure. 6. A cooling unit having the heat storage material, a first expansion device, a cooler, a second expansion device, a heat storage material heat exchanger, a circulation pump and a suction pressure adjusting valve, and the compressor and the condenser. 3. The regenerative refrigeration system according to claim 2, wherein the regenerative refrigeration system is configured to be connected to a compressor unit. 7. The regenerative refrigeration system according to claim 6, wherein a plurality of said cooler units are connected to a common compressor unit.