JP2000230765A - Cooling device and showcase equipped with cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the peak-cut operation of an electric power in the daytime in summer especially by a method wherein a period of time, in which a surplus capacity is generated in a cooling device when an outdoor temperature is lowered at night, is utilized effectively to reduce an electric power consumption as well as a cost for heat. SOLUTION: A cooling device is installed in a showcase, in which the inside of a showcase main body 1, constituted of heat insulating walls 3, is defined by a duct sheet 4 to form a cold air passage 7 and a fan 12 is arranged in the air passage 7. In this case, the cooling device is provided with a cooler 16, installed in the air passage 7 and provided with a heat storage member for cooling air ventilated by the fan 12 to cool the inside of the main body 1, and a cooling circuit, connected to the cooler 16 to store heat in the heat storage member, while the heat storage operation of the heat storage member is controlled in accordance with the fluctuation of a temperature in the main body 1 and a set time of the heat storage member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device installed in a freezing and refrigerated showcase and a freezing and refrigerated showcase provided with the cooling device.

[0002]

2. Description of the Related Art For example, an open type refrigerated showcase is formed of a heat insulating wall 3 as shown in FIG. 15 and has a duct plate 4 and a bottom plate 15 inside a showcase body 1 having an opening 2 on the front surface. It is divided into a product storage 5 and a cool air passage 7, and the heat insulating wall 3 side in the cold air passage 7 is further divided by a partition plate 6 to form an air passage 8 on the heat insulating wall 3 side, A blower 12 and a cooler 13 are disposed in the cool air passage 7, and the upper end of the cool air passage 7 is connected to the cool air outlet 9.
The upper end of the ventilation passage 8 is formed at the outlet 10 at a position outside the cold air outlet 9, and the lower end of the opening 2 is formed with the cooling ventilation passage 7 and a suction port 11 communicating with the ventilation passage 8.
In the figure, reference numeral 14 denotes a product display shelf arranged in a plurality of stages in the product storage 5.

A cooling device provided in such a showcase is constituted by a conventionally known refrigeration cycle,
A condenser and an evaporator, which is a cooler, are sequentially connected to the outlet side of the compressor by a refrigerant pipe, and the outlet side of the evaporator is connected to the compressor by a refrigerant pipe.

In order to cool the inside of the product storage 5,
The air sucked from the inlet 11 by the blower 12 is cooled by the cooler 13 in the cool air passage 7, and is blown out from the upper cool air outlet 9 toward the front opening 2 through the cool air passage 7. Thereby, a cold air curtain is formed in the opening 2 to prevent the outside air from entering the product storage 5, and at the same time, the inside of the product storage 5 is cooled to a predetermined temperature. The cool air curtain is sucked from the lower suction port 11, cooled again by the cooler 13 in the cool air passage 7, and repeats this circulation.

On the other hand, a part of the air sucked into the suction port 11 by the blower 12 does not enter the cool air
After entering, it flows outside the formed cold air curtain blown out from the blowout port 10 and blown out from the cold air blowout port 9 to guard the cold air curtain.

[0006] The showcase operated in such a cooling manner is usually installed in a food store, and has a product storage 5.
In order to keep frozen refrigerated food stored inside,
The cooling operation is performed day and night, and the temperature in the refrigerator is detected by a temperature sensor such as a thermistor sensor disposed in an appropriate place such as the product storage 5. As shown in the operation control diagram of FIG. If the temperature has decreased to a certain value, the operation of the cooler 13 is turned off. Thereafter, if the temperature in the refrigerator rises to a certain value, the operation of the cooler 13 is restarted. The cooler 13 is continuously operated by repeating the fine on / off operation. Note that the blower for the cooler 13 operates even when the cooler 13 is off.

[0007]

As described above, in the cooling operation, although the cooler is finely turned on and off, the cooling operation is performed as a whole.
Operation has continued for 4 hours. Therefore, power consumption is high and heat cost is high. In addition, especially in summer, at the peak of power consumption in the daytime, the power consumption by the air conditioner is coupled to cause power shortage.

[0008] An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to reduce the outside air temperature such as at night, thereby suppressing the rise in the internal temperature. For showcases where products that are not stored in the refrigerator at night are stored, there is excess capacity in the cooling system, such as during the night, so that even if the cooling capacity is reduced, there is no problem in keeping the product cool. It is an object of the present invention to provide a cooling device and a showcase in which the cooling device is installed, which can be used effectively to reduce power consumption and heat costs, and in particular, to perform peak-cut operation of power during the daytime in summer.

[0009]

According to the present invention, in order to achieve the above object, first, an air passage is formed by partitioning an inside of a main body constituted by a heat insulating wall with a duct plate, and a blower is provided in the air passage. A cooling device installed in the arranged showcase, wherein the cooling device has a heat storage member that is installed in the air passage and cools the inside of the main body by cooling the air blown by the blower. A cooling circuit connected to the heat storage member for storing heat,
The heat storage member is configured such that the heat storage operation is controlled in accordance with the high / low state of the temperature inside the main body and the set time, so that the heat storage member can store heat at night or when the outside air temperature is low and the temperature inside the main body is low. The operation is performed, and the heat dissipation operation is performed, for example, during the peak power consumption in the daytime.

[0010] Since the heat storage operation is performed during a time when the temperature in the refrigerator is small, there is almost no hindrance to keeping the product cool.
By performing the heat dissipation operation at the peak power consumption in the daytime, the peak power cut operation can be achieved. Furthermore, if the heat storage operation is performed at night, cheap nighttime electric power can be used, and the heat cost can be reduced.

Second, the heat storage operation of the heat storage member is performed continuously or intermittently for a fixed time by the output from the cooling circuit, and when the temperature in the main body is low or a set time has come, the cooling operation is performed. By stopping or lowering the output for cooling from the circuit, when the cooling capacity for keeping the product cool is small, the excess cooling capacity is used effectively, and by suppressing the output, wasteful power consumption is reduced. Can be prevented.

Third, when the temperature inside the main body is high or low or when a set time has elapsed, the air flow rate of the blower is changed, so that the air flow rate is reduced when the cooling capacity for keeping the product cool is small and sufficient. By doing so, wasteful power consumption can be prevented.

Fourthly, a separate cooler is provided in a second air path which is independent of the first air path in which a cooler for storing the heat storage member is provided, and the heat storage member is stored in the heat storage member. During the heat storage operation, by stopping the air supply to the first air path,
The heat storage effect can be prevented from being hindered, and the cooler that stores the heat storage member can be prevented from receiving the wind and forming frost.

Fifth, by providing air path closing means for preventing the inflow of the air in the first air path for stopping the air blowing, during the heat storage operation for storing the heat of the heat storage member, the air path closing means is used. Since the airflow to the first air path is shut off, no air is blown to the cooler that stores the heat storage member. Therefore, it is possible to prevent frost from being formed on the cooler provided in the first air passage due to the blowing.

Sixth, in a showcase in which a main body constituted by a heat insulating wall is partitioned by a duct plate to form a cool air ventilation passage in which a cooler and a blower are disposed and a product storage for storing products, By partitioning the inside of the cool air ventilation path with a partition plate, and disposing the first cooler for performing heat storage and heat radiation and the second cooler for performing normal cooling in separate cool air ventilation paths,
The operation time of the first cooler and the operation time of the second cooler can be properly used. Therefore, by using the first cooler, the thermal cost can be reduced by effectively using the cheap nighttime electric power, and at the same time, the peak cut operation of the electric power can be performed, and the power consumption can be reduced.

Further, since the cool air passages in which the second cooler for performing normal cooling and the first cooler for performing heat storage and heat radiation are respectively provided are formed as separate and independent ones, the respective coolers are provided separately. Different evaporating temperatures corresponding to the functions can be set, and the function of each cooler can be secured. Incidentally, it is necessary to set the evaporating temperature of the first cooler that performs heat storage and heat release during the heat storage operation to be lower than the evaporating temperature of the second cooler that performs normal cooling.

Seventh, when the temperature inside the main body is high or low or when a set time has arrived, the respective operation timings of the first cooler and the second cooler are set, and heat radiation by the first cooler is performed. During operation, the cooling operation of the second cooler is stopped. For example, when the temperature in the main body is low or at night, the heat storage operation is performed in the first cooler, and the heat dissipation operation is performed during the peak power consumption in the daytime. However, if the second cooler is stopped during the heat dissipation operation, it is possible to reduce the heat cost by effectively using the cheap nighttime electric power, and at the same time, it is possible to perform the peak cut operation of the electric power, Power can be reduced.

Eighth, the operation time of each of the first cooler and the second cooler is set in accordance with the high / low state of the temperature in the main body or the arrival of the set time, and the heat is radiated by the first cooler. By stopping the cooling operation of the second cooler during operation and supplying a smaller amount of refrigerant to the first cooler than the amount supplied to the second cooler during normal cooling operation,
For example, the heat storage operation is performed by the first cooler in a time zone such as when the temperature in the main body is low or at night, and the heat dissipation operation is performed during the peak power consumption in the daytime.

In this heat dissipation operation, a small amount of refrigerant is supplied to the first cooler to perform a cooling action by heat exchange at the same time as the heat dissipation operation. The number of members can be reduced, and the whole can be configured at low cost. Since the amount of the refrigerant supplied to the first cooler during the heat dissipation operation is small as described above, even if the cooling circuit is operated, the operation cost can be reduced as compared with the case where the cooling circuit is operated normally.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal side view of a showcase in which a first embodiment of a cooling device of the present invention is installed.
The basic configuration is the same as that of the conventional example already described with reference to FIG. 15. The interior of the showcase main body 1 formed by the heat insulating wall 3 and having the opening 2 on the front surface is partitioned by the duct plate 4 and the bottom plate 15 to store the product storage 5. And a cold air ventilation path 7, and the heat insulating wall 3 side in the cold air ventilation path 7 is further partitioned by a partition plate 6 to form a ventilation path 8 on the side of the heat insulating wall 3. The blower 12 and the cooler 16 are provided.

In the present invention, the cooler 16 is constituted by a heat storage heat exchanger having a heat storage member. The heat exchanger for heat storage,
For example, as shown in FIGS. 2 and 3, a plurality of substantially flat heat storage members 20 are arranged in parallel with each other at a predetermined interval, and penetrate the heat storage members 20 at right angles to put the cooling pipe 22 in a meandering state. The end plates 21a and 21b are arranged outside the heat storage member 20 located at the end of the pipe.

The heat storage member 20 is formed of a hollow molded product made of a synthetic resin such as polyethylene, polypropylene, or polybutene, and a heat storage agent 23 is filled in the hollow. The heat storage agent 23 mainly stores heat by physical and chemical changes, and preferably has a large heat capacity per unit weight or volume and a large latent heat during melting and solidification. Usually, a cold heat storage agent is used. For example, sodium carbonate or potassium hydrogen carbonate is used depending on the heat storage temperature.
A sodium acetate mixture or the like is used as a heat storage agent for warming. Further, when the heat storage amount may be slightly smaller, it is possible to use water or the like as a heat storage agent and to store the heat by a change in the temperature. In this case, an inexpensive heat exchanger can be used. Is obtained.

A cooler 1 comprising such a heat storage heat exchanger
6 is provided with a cool air outlet 9 at the upper end of the cooling air passage 7.
In addition, the upper end of the ventilation passage 8 is formed at the outlet 10 at a position outside the cool air outlet 9, and the lower end of the opening 2 is formed with the suction opening 11 communicating with the cooling ventilation passage 7 and the ventilation passage 8. I have. In the figure, reference numeral 14 denotes a product display shelf arranged in a plurality of stages in the product storage 5. Although not shown, a temperature sensor using a thermistor or the like for detecting the temperature inside the showcase body 1 is provided at an appropriate place such as in the product storage 5.

A cooling circuit is connected to the cooler 16. As shown in FIG. 4, the cooling circuit connects the condenser 26, the liquid reservoir 27, the solenoid valve 28, and the cooler 16 in sequence with the refrigerant pipe 29 at the outlet side of the compressor 25, as is conventionally known, as shown in FIG. The outlet side of the compressor 16 is further connected to the inlet side of the compressor 25 via a refrigerant pipe 29 to form a refrigeration cycle. The cooler 16 is provided with a blower 12 for the cooler 16.

The on / off control of the cooler 16 is performed when it is determined that the temperature has fallen below a certain temperature based on an output from a temperature sensor for detecting the temperature inside the showcase body 1 or when a preset time is reached by a timer or the like. For example, 22
The control is configured to be turned on when the time comes.

Next, the operation will be described with reference to the time chart of FIG. When the temperature inside the showcase body 1 drops below a certain level to be in a low temperature state, or when the set time is, for example, at 22:00 in the night when the outside air temperature becomes low, the cooling circuit is activated and the solenoid valve 28 is turned on When opened, the refrigerant sent from the compressor 25 is supplied to the cooler 16 constituted by a heat storage heat exchanger via the condenser 26, whereby the heat storage operation is started.

In the cooler 16, the refrigerant flows through the cooling pipe 22 so that the cold energy of the refrigerant is stored in the heat storage member 20.
In addition to conducting heat to the heat storage agent 23 and cooling the heat storage agent 23, it cools a fluid, for example, air flowing outside the cooling pipe 22 and between the heat storage members 20. By this heat exchange action, cold energy is stored in the heat storage agent 23 of the heat storage member 20.

There are several methods for detecting the full storage of cold energy, one of which is to detect the surface temperature of the heat storage member 20 or the temperature of the heat storage agent 23 with a temperature sensor such as a thermistor sensor, If it is below, it is determined that it is full. As another method, the refrigerant control of the cooler 16 is performed by an electronic expansion valve, and when it is determined that the degree of superheat at the outlet of the cooling pipe 22 has become equal to or less than a predetermined value, it is determined that the storage is full. For example, when the degree of superheat at the start of the heat storage operation is 5 deg, the degree of superheat decreases with the progress of cold storage.

As described above, when it is determined that the cold energy is full, the heat storage operation is terminated. This heat storage operation is performed by using inexpensive nighttime electric power, for example, at night when the temperature inside the showcase main body 1 becomes low and the goods stored in the showcase such as a lunch box become empty.

Then, even after the heat storage operation is completed once, during a certain time period such as at night or when the temperature inside the showcase body 1 is low, the detection of the full storage of the cold energy is continued and the intermittent operation is performed intermittently. A full storage state is maintained by performing a heat storage operation. During the full storage operation, the cooling operation is not performed.
Since the blower 12 for 6 is turned on with the amount of blown air reduced, the temperature in the showcase main body 1 does not rise significantly. In addition, during a certain time period such as at night or when the temperature inside the showcase body 1 is low and the heat storage operation is not performed, the power consumption is reduced by stopping or reducing the output of the cooling circuit. To save money.

In the daytime or when the temperature inside the showcase body 1 is higher than a predetermined value and high, the heat radiation operation is performed. In this heat dissipation operation, the output of the cooling circuit is stopped, only the blower 12 of the cooler 16 constituted by the heat exchanger for heat storage is turned on, and the cold energy stored in the heat storage member 20 is released from the cool air outlet 9 and The inside is cooled to a predetermined temperature. Adjustment of the internal temperature is performed by adjusting the amount of air blown by the blower 12.

Cooler 1 comprising such heat storage heat exchanger
The showcase where 6 is installed is particularly suitable for a showcase that displays products that are not stored in the showcase at night, such as a lunch box, so that there is no problem even if only the heat storage operation is performed at night. It is effective and can reduce operating power cost with a simple structure.

FIG. 6 shows a second embodiment. The basic structure is the same as that of the first embodiment. In the first embodiment, a portion corresponding to the cool air passage 7 is further divided by a partition plate 17 in the ventilation direction. The first cold air passage 7a and the second cold air passage 7b are formed as separate independent first air passages 7a and second air passages 7b. The first cool air passage 7a located on the side of the commodity storage 5 has a wide lower portion formed therein, and a cooler 16 formed of a heat storage heat exchanger similar to that provided in the first embodiment here. Is arranged,
The second cool air ventilation passage 7b located on the side of the ventilation passage 8 has a wide upper portion formed therein, and the second cooler 1 for normal cooling is provided here.
3a is provided.

Then, as shown in FIG.
a, 7b, a plurality of blowers 12a,
A fan guide 18 having 12b mounted in parallel is provided, and the inside of the fan guide 18 is divided into two independent air paths by a partition plate 19, and each air path communicates with the cool air ventilation paths 7a and 7b. The blower 12a is made to correspond to the cool air passage 7a, and the blower 12b is made to correspond to the cool air passage 7b. In this case, in the illustrated example, of the four blowers 12a and 12b arranged in parallel in the width direction, two inner blowers 12a correspond to the cool air passage 7a, and two outer blowers 12b.
Correspond to the cool air passage 7b, but may be reversed.

In addition, one fan guide 18 is
9, the air passages respectively corresponding to the cool air passages 7a and 7b are formed. However, the present invention is not limited to this, and the fan guides respectively corresponding to the cool air passages 7a and 7b are formed separately and independently. May be.

Further, the vertical position of the cooler 13a and the cooler 16 may be opposite to that of the example shown in FIG. 6, and the positional relationship between the cool air passages 7a and 7b is also the same as that shown in FIG. Conversely, a second cool air passage 7b may be formed on the product storage 5 side, and a first cool air passage 7a may be formed behind the second cool air passage 7b.

FIG. 8 is a diagram showing a cooling circuit connected to the cooler 13a and the cooler 16. The outlet side of the compressor 25 is connected to the condenser 26 and the liquid reservoir 27 in order by the refrigerant pipe 29, and the liquid reservoir 2 is connected.
7 is connected to the inlet side of the cooler 13a via a solenoid valve 31 and a pressure reducing device 32 via a refrigerant pipe 29, and the outlet side of the cooler 13a is connected to a narrowing device 34 in parallel. The refrigerant pipe 29 was connected to the inlet side of the compressor 25 via a valve 33.

Further, a cooling circuit of a cooler 16 composed of a heat storage heat exchanger is formed in parallel with the cooling circuit of the normal cooler 13a. The cooling circuit of the cooler 16 branches the refrigerant pipe 29 on the inlet side of the solenoid valve 31, connects the branched refrigerant pipe 29 to the inlet side of the cooler 16 via the solenoid valve 28 and the throttle device 35, The outlet side of the heat exchanger 16 is joined with the refrigerant pipe 29 from the solenoid valve 33 so that the refrigerant pipe 29
To connect to the inlet side of the compressor 25.

Next, the operation will be described with reference to the time chart of FIG. In the normal cooling operation, the air sucked from the suction port 11 by the blower 12b passes through the cool air passage 7b, is sent to the normal cooler 13a, where it is exchanged heat and cooled to become cool air. The air is blown out, forming a cool air curtain in the opening 2 and cooling the inside of the product storage 5 to a predetermined temperature.

During this time, as shown in FIG. 10, in the cooling circuit, the solenoid valves 31 and 33 are opened, the refrigerant is supplied only to the cooler 13a, only the cooling operation by the normal refrigeration cycle is performed, and the solenoid valve 28 is closed. Therefore, no refrigerant is supplied to the cooler 16 constituted by the heat exchanger for heat storage, and the cooler 16 is stopped.

When a predetermined time at night set by a timer or the like arrives, or when the temperature inside the showcase main body 1 detected by the temperature sensor becomes lower than a predetermined value, a temperature drop occurs in the cooling circuit. Utilizing the excess cooling capacity that has been performed, as shown in FIG. 11, the electromagnetic valve 28 is opened to flow the refrigerant also to the cooler 16 constituted by the heat storage heat exchanger, and the cooler 16 performs the heat storage operation. Since the heat storage operation is the same as that of the first embodiment, the detailed description is omitted here.

The cooler 16 composed of this heat storage heat exchanger
Is to select a heat storage agent 23 that can exhibit the same performance as the cooler 13a during heat radiation.
In order to store the heat in step 6, the evaporation temperature needs to be set lower than that of the cooler 13a. To cope with this, in the present invention, during the heat storage operation, the solenoid valve 33 on the outlet side on the side of the cooler 13a is used.
Is closed, and the refrigerant is caused to flow to the side of the expansion device 34 to reduce the pressure, thereby returning the refrigerant to the same temperature as the evaporation temperature of the refrigerant sent from the cooler 16 and returning the refrigerant to the compressor 25.

By the way, in a normal cooling operation in which only the cooler 13a is operated, the temperature of the refrigerant returned to the compressor 25 is -6.degree.
However, during the heat storage operation, the evaporation temperature in the cooler 16 is about −13 ° C., so the refrigerant temperature returned to the compressor 25 also needs to be set to about −13 ° C.

In this way, the heat storage operation is performed using cheap nighttime electric power at night or the like, and the cold energy is stored. The detection of full storage is the same as in the first embodiment. During the heat storage operation, the blower 12a of the cooler 16 is stopped.
However, since one of the blowers 12b is operating, there is a possibility that the stopped blower 12a reversely flows into the cooler 16 due to a pressure difference, causing frost to form on the cooler 16. In order to deal with this, in the present invention, the blower 1
A small voltage is applied to 2a to prevent a reverse rotation in a locked state, or a small voltage is applied to the blower 12a to rotate forward at a low rotation to apply a pressure to prevent inflow, or if there is an installation space, an electric power is supplied to the blower 12a. Install a damper that can be opened and closed by dynamic control.

At the time of peak power consumption in the daytime, as shown in FIG. 12, the operation of the compressor 25 and other normal cooling circuits including the cooler 13a for normal cooling and all the blowers 12b are stopped. Blower 12a for heat storage
Only the operation is performed to perform a heat radiation operation of radiating heat from the cooler 16 to cool the inside of the refrigerator. This is performed by adjusting the air volume of the blower 12a for controlling the internal temperature by allowing the cooler 16 to cool. As a result, the electric power used at the time of the peak power consumption is used only for the operation of the blower 12a, and the peak can be cut.

During the heat dissipation operation, the compressor 25 is operated as described above.
Without completely stopping the operation of the other normal cooling circuits and all of the blowers 12b, a smaller amount of refrigerant than the supply amount of the refrigerant flowing to the cooler 13a in the normal cooling operation is supplied to the cooler 16 to store heat. And cooling operation can be performed simultaneously. In this case, the operating power of the cooler 15 is required, but the capacity of the cooling circuit is controlled and the amount of supplied refrigerant is small, so that the operating cost can be lower than in the normal operation. Further, since the size of the cooler 16 can be reduced, the amount of the expensive heat storage agent used can be reduced.

In the second embodiment, the blowers 12a, 12a
b is provided separately as corresponding to the cool air passages 7a and 7b, but in the third embodiment, the blower 12 is shared by the cooler 13a and the cooler 16 as shown in FIGS. , The cool air ventilation passages 7a, 7 on the side where the ventilation is stopped
As a means for closing b, a damper 36 is provided at the suction port 11 at a position downstream of the blower 12.

In the example shown in FIG.
The side surface is formed in an L-shape, and the corner portion of the L-shape is used as a rotation axis. The state shown in the figure is a state during a normal cooling operation or a heat storage operation.
b communicates with the suction port 11. If the damper 36 is rotated 90 degrees rightward from this state during the heat dissipation operation, the cool air passage 7a communicates with the suction port 11 and the cool air passage 7b is shut off.

The example of the damper 37 shown in FIG. 14 is a flat plate, and its end is rotatable in the direction of the cool air passages 7a, 7b at the end of the partition plate 17 which separates the cool air passages 7a, 7b. Attached to.

In the above-described embodiment, the showcase is an open showcase in which the front surface is formed in the opening 2, but the present invention is not limited to this, and the present invention can be applied to a type in which an opening is formed in the upper surface.

[0051]

As described above, in the cooling device of the present invention and the showcase in which the cooling device is installed, first, the inside of the main body composed of the heat insulating wall is partitioned by the duct plate to form the air passage. A cooling device installed in a showcase in which a blower is disposed in the air passage, the heat storage member being installed in the air passage and cooling air blown by the blower to cool the inside of the main body. A cooling circuit connected to the cooling device and configured to store heat in the heat storage member, wherein the heat storage member is configured such that a heat storage operation is controlled according to a high / low state of the temperature in the main body and a set time. By doing so, the heat storage operation is performed at night or when the outside air temperature is low and the temperature inside the main body is low, and the heat dissipation operation is performed, for example, during the peak power consumption in the daytime.

Since the heat storage operation is performed during a time when the temperature in the refrigerator is small, there is almost no problem in keeping the product cool.
By performing the heat dissipation operation at the peak power consumption in the daytime, the peak power cut operation can be achieved. Furthermore, if the heat storage operation is performed at night, cheap nighttime electric power can be used, and the heat cost can be reduced.

Secondly, the heat storage operation of the heat storage member is performed continuously or intermittently for a fixed time by the output from the cooling circuit, and when the temperature in the main body is low or a set time has come, the cooling operation is performed. By stopping or lowering the output for cooling from the circuit, when the cooling capacity for keeping the product cool is small, the excess cooling capacity is used effectively, and by suppressing the output, wasteful power consumption is reduced. Can be prevented.

Third, when the temperature inside the main body is high or low or when a set time has come, the air flow of the blower is changed, so that the air flow is reduced when the cooling capacity for cooling the product is small and sufficient. By doing so, wasteful power consumption can be prevented.

Fourth, a separate cooler is provided in a second air passage which is independent of the first air passage in which a cooler for storing the heat storage member is provided, and the heat storage member is stored in the heat storage member. During the heat storage operation, by stopping the air supply to the first air path,
The heat storage effect can be prevented from being hindered, and the cooler that stores the heat storage member can be prevented from receiving the wind and forming frost. Also,
By separating the cool air passage for performing the normal cooling operation and the cool air passage for performing the heat storage operation and the heat dissipation operation, the temperature drop in each cool air passage can be reduced, and the cooling efficiency is improved.

Fifthly, by providing air path closing means for preventing the inflow of the air in the first air path for stopping the air blowing, during the heat storage operation for storing heat in the heat storage member, the air path closing means is used. Since the airflow to the first air path is shut off, no air is blown to the cooler that stores the heat storage member. Therefore, it is possible to prevent frost from being formed on the cooler provided in the first air passage due to the blowing.

Sixth, in a showcase in which the inside of a main body constituted by a heat insulating wall is partitioned by a duct plate to form a cool air ventilation passage in which a cooler and a blower are disposed and a product storage for storing products, By partitioning the inside of the cool air ventilation path with a partition plate, and disposing the first cooler for performing heat storage and heat radiation and the second cooler for performing normal cooling in separate cool air ventilation paths,
The operation time of the first cooler and the operation time of the second cooler can be properly used. Therefore, by using the first cooler, the thermal cost can be reduced by effectively using the cheap nighttime electric power, and at the same time, the peak cut operation of the electric power can be performed, and the power consumption can be reduced.

Further, since the cool air ventilation passages in which the second cooler for performing normal cooling and the first cooler for performing heat storage and heat radiation are respectively formed are formed separately and independently, each cooler is provided with a separate cooler. Different evaporating temperatures corresponding to the functions can be set, and the function of each cooler can be secured. Incidentally, it is necessary to set the evaporating temperature of the first cooler that performs heat storage and heat release during the heat storage operation to be lower than the evaporating temperature of the second cooler that performs normal cooling.

Seventh, when the temperature inside the main body is high or low or when a set time has come, the respective operation timings of the first cooler and the second cooler are set, and the heat is radiated by the first cooler. During operation, the cooling operation of the second cooler is stopped. For example, when the temperature in the main body is low or at night, the heat storage operation is performed in the first cooler, and the heat dissipation operation is performed during the peak power consumption in the daytime. However, if the second cooler is stopped during the heat dissipation operation, it is possible to reduce the heat cost by effectively using the cheap nighttime electric power, and at the same time, it is possible to perform the peak cut operation of the electric power, Power can be reduced.

Eighth, when the temperature inside the main body is high or low or when a set time has come, the respective operation timings of the first cooler and the second cooler are set, and the heat is radiated by the first cooler. By stopping the cooling operation of the second cooler during operation and supplying a smaller amount of refrigerant to the first cooler than the amount supplied to the second cooler during normal cooling operation,
For example, the heat storage operation is performed by the first cooler in a time zone such as when the temperature in the main body is low or at night, and the heat dissipation operation is performed during the peak power consumption in the daytime.

In this heat radiating operation, a small amount of refrigerant is supplied to the first cooler to perform the cooling operation by heat exchange at the same time as the heat radiating operation. The number of members can be reduced, and the whole can be configured at low cost. Since the amount of the refrigerant supplied to the first cooler during the heat dissipation operation is small as described above, the operation cost can be reduced even when the cooling circuit is operated, as compared with the case where the cooling circuit is operated normally.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a showcase provided with a first embodiment of a cooling device of the present invention.

FIG. 2 is a front view of a cooler provided in the cooling device of the present invention.

FIG. 3 is a vertical sectional front view of a heat storage member which is a main part of a cooler provided in the cooling device of the present invention.

FIG. 4 is a cooling circuit diagram of the first embodiment of the cooling device of the present invention.

FIG. 5 is a time chart of operation control of the cooling device according to the first embodiment of the present invention.

FIG. 6 is a vertical sectional side view of a showcase including a cooling device according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a main part of a showcase including a cooling device according to a second embodiment of the present invention.

FIG. 8 is a cooling circuit diagram of a cooling device according to a second embodiment of the present invention.

FIG. 9 is a time chart of operation control of a cooling device according to a second embodiment of the present invention.

FIG. 10 is a cooling circuit diagram in a normal cooling operation of a cooling device according to a second embodiment of the present invention.

FIG. 11 is a cooling circuit diagram of a heat storage operation of a cooling device according to a second embodiment of the present invention.

FIG. 12 is a cooling circuit diagram of a cooling operation of a cooling device according to a second embodiment of the present invention.

FIG. 13 is a vertical sectional side view of a showcase including a cooling device according to a third embodiment of the present invention.

FIG. 14 is a longitudinal sectional side view of a main part of a showcase including a cooling device according to a third embodiment of the present invention.

FIG. 15 is a vertical side view of a showcase provided with a conventional cooling device.

FIG. 16 is a time chart of operation control of a conventional cooling device.

[Explanation of symbols]

1 ... showcase body, 2 ... opening, 3
... heat insulation wall, 4 ... duct plate, 5 ... goods storage, 6 ... partition plate, 7, 7a, 7b ... cold air passage, 8
... Ventilation path, 9 ... Cold air outlet, 10 ... Air outlet,
11 ... suction port, 12, 12a, 12b ... blower, 13, 13a ... cooler, 14 ... display shelf,
15 ... bottom plate, 16 ... cooler, 17 ...
Partition plate, 18: Fan guide, 19: Partition plate, 20: Heat storage member, 21a, 21b ...
End plate, 22 ... Cooling pipe, 23 ...
Heat storage agent, 25 ... compressor, 26 ... condenser,
27: liquid reservoir, 28: solenoid valve, 29: refrigerant pipe, 31: solenoid valve, 32: throttle device, 33: solenoid valve, 34: throttle device,
35: diaphragm device, 36: damper, 37
… Damper

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masami Imanishi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Koji Yamashita 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 3B110 AA10 BA05 BA06 3L045 AA04 BA01 BA10 CA02 DA02 EA01 GA04 HA01 HA02 HA07 KA16 PA04

Claims (8)

[Claims] 1. A cooling device installed in a showcase in which an inside of a main body constituted by a heat insulating wall is partitioned by a duct plate to form an air passage, and a blower is disposed in the air passage, wherein the air passage is provided. A cooling device having a heat storage member that cools air blown by a blower and cools the inside of the main body, and a cooling circuit that is connected to the cooler and stores the heat storage member. A cooling device characterized in that a heat storage operation is controlled in accordance with a high / low state of a temperature in a main body and a set time. 2. A heat storage operation of the heat storage member is performed continuously or intermittently for a fixed time by an output from a cooling circuit, and when a temperature in the main body is low or a set time has come, a cooling circuit is started. 2. The cooling device according to claim 1, wherein the output for cooling is stopped or reduced. 3. The cooling device according to claim 1, wherein an amount of air blown by the blower is changed according to a high or low state of the temperature in the main body or a set time. 4. A heat storage for storing heat in the heat storage member by providing a separate cooler in a second air path separate from the first air path in which a cooler for storing heat in the heat storage member is provided. While driving,
The cooling device according to claim 1, wherein blowing air to the first air passage is stopped. 5. The cooling device according to claim 4, wherein airflow closing means for preventing airflow is provided in the first airflow path for stopping airflow. 6. A showcase in which the inside of a main body constituted by a heat insulating wall is partitioned by a duct plate to form a cool air ventilation passage in which a cooler and a blower are arranged and a product storage for storing products. A showcase, wherein the inside of a ventilation path is partitioned by a partition plate, and a first cooler for performing heat storage and heat radiation and a second cooler for performing normal cooling are respectively disposed in separate cool air ventilation paths. 7. An operation timing of each of a first cooler and a second cooler is set according to a high / low state of the temperature in the main body or a set time, and during the heat dissipation operation by the first cooler. The showcase according to claim 1, wherein the cooling operation of the second cooler is stopped. 8. An operation timing of each of a first cooler and a second cooler is set according to a high / low state of the temperature in the main body or a set time, and during the heat dissipation operation by the first cooler. Stops the cooling operation of the second cooler,
The showcase according to claim 6, wherein a smaller amount of refrigerant is supplied to the first cooler than is supplied to the second cooler during a normal cooling operation.