KR100250094B1 - Chiller cabinet - Google Patents

Abstract

It provides a cold storage that can reduce power consumption at the peak of power demand and contribute to leveling demand power.

The compressor 22, the condenser 23, the decompression device 25, the 1st cooler 26, and the 2nd cooler 27 are connected in an annular pipe order. The second cooler 27 is composed of a coolant 29 and an evaporation pipe 31. The control device 32 controls the operation of the compressor 22 based on the temperature in the reservoir and the set temperature, and stops the compressor 22 at the peak time of the power demand.

Description

Cooling Storage {CHILLER CABINET}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to refrigerated storage such as refrigerated and frozen showcases installed in stores such as supermarkets and convenience stores.

Conventionally, in such a cold storage, for example, as shown in Japanese Patent Application Laid-Open No. Hei 1-79,884 (F25D21 / 08) and Japanese Patent Application Laid-Open No. Hei 8-136107 (F25D16 / 00), a low-temperature article is stored in the storage. There existed a storage chamber and a cold air circulation circuit, and employ | adopted the structure which arrange | positions and cools a cool storage agent in this cold air circulation circuit. At the time of defrosting, the blower is operated to circulate air cooled by the latent heat of fusion of the coolant into the storage compartment to maintain the inside of the storage compartment at a predetermined temperature.

That is, in such a cold storage, since the cooling operation stops during the defrost of the cooler, the inside of the storage chamber cannot be cooled. For this reason, the coolant was placed in the cooling circulation circuit to freeze the coolant during the cooling operation, and during the defrosting of the cooler, the air circulated by the coolant was cooled to cool the inside of the storage chamber.

By the way, since the temperature rises in the middle of the summer and the like, in general homes, factories, shops, etc., the cooling is fully operated, and the peak demand power also increases. Therefore, in order to promote the efficient use of electric power, it is desired to cut and equalize the peak of the demand power, but in the supermarkets and convenience stores where showcases are operated all year round, measures against the leveling of the conventional power demand have been made. There was not.

The present invention has been made to solve such a conventional technical problem, and an object of the present invention is to provide a cooling reservoir that can reduce power consumption at the peak of power demand and contribute to leveling demand power.

1 is a front view of the cold reservoir of the present invention.

2 is a longitudinal side view of the cold storage.

3 is a refrigerant circuit diagram of a cooling device.

4 is a timing chart showing the operation of the compressor and the transition of the temperature in the reservoir.

Figure 5 is a longitudinal side view of a cold reservoir of another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: cooling storage

11: insulation box member

12: partition plate

14: Duct

15: In the store

18: glass door

21: cooling unit

22: compressor

23 condenser

24: blower

26: first cooler

27: second cooler

28: blower

29: coolant

30: machine room

31: evaporation pipe

32: control unit

That is, the cooling reservoir of the present invention is formed by cooling the inside of the reservoir with a cooler constituting the cooling apparatus, and the controller and the cooler for controlling the cooling apparatus based on the temperature in the reservoir or the temperature of the cold air circulated in the reservoir and the set temperature. The coolant provided in the heat exchanger is installed in the heat exchanger, and the control device stops the operation of the cooling device during a period when the demand power peaks.

According to the present invention, in a cooling reservoir formed by cooling the inside of a reservoir with a cooler constituting the cooling apparatus, a controller and a cooler for controlling the cooling apparatus based on the temperature in the reservoir or the temperature of the cold air circulated into the reservoir and the set temperature. The coolant provided in the heat exchanger is installed in the heat exchanger, and the control device stops the operation of the cooling device while the demand power peaks, and the operation of the blower is continued. Due to the latent heat of fusion, the cooling device can be shut down while maintaining the cooling capacity in the reservoir, thereby contributing to the leveling of demand power.

In particular, since the cooling machine is also defrosted in the period during which the cooling device is stopped, it is also possible to omit a special defrosting device such as a defrost heater.

2. The cooling device of the invention is characterized in that, in a period in which the demand power peaks, when the temperature in the storage room or the temperature of the cold air circulated into the storage room reaches a predetermined high temperature higher than the upper limit of the set temperature, the control device is configured to To start driving.

According to the present invention, in the period in which the demand power peaks, when the temperature in the storage room or the temperature of the cold air circulated into the storage room reaches a predetermined high temperature higher than the upper limit of the set temperature, the control device stops the operation of the cooling device. Since the temperature of the storage compartment and the like has risen to the high temperature while the operation of the cooling device is stopped, the operation of the cooling device is started, and the cooling operation by the cooler is resumed.

Therefore, frequent entry and exit of articles in the reservoir is performed during the period in which the cooling device is stopped, and the inside of the reservoir can be surely cooled even if the temperature in the reservoir rises abnormally.

3. The cold storage of the invention has a predetermined low temperature in which the temperature of the storage or the temperature of the cold air circulated into the storage is higher than the lower limit of the set temperature after starting the operation of the cooling apparatus in the period in which the demand power becomes the peak. If so, the control device stops the operation of the cooling device.

According to the invention, in the period in which the demand power peaks, after the operation of the cooling device starts, the temperature in the reservoir or the temperature of the air circulated into the reservoir reaches a predetermined low temperature higher than the lower limit of the set temperature. In this case, since the control device stops the operation of the cooling device, it is possible to minimize the operation of the cooling device due to the abnormal temperature rise and to minimize the increase in power consumption during the period when the demand power peaks. Will be.

4. In each of the above inventions, the cold storage of the invention comprises a cooler provided with a first cooler and a second cooler provided in a duct, and the compressor, the condenser, the decompression device, the second cooler, and the first cooler are connected in turn in an annular manner. The refrigerant circuit of the cooling device is configured, and the second cooler is provided with a coolant and disposed on the downstream side of cold air in the duct.

According to the invention, each of the above inventions comprises a cooler composed of a first cooler and a second cooler installed in a duct, and a compressor, a condenser, a pressure reducing device, a second cooler, and a first cooler are connected in turn in an annular manner to cool the refrigerant of the cooling device. In addition to the circuit configuration, the second cooler was provided with a coolant and disposed downstream of the cold air in the duct. Thus, the refrigerant decompressed by the pressure reducing device first flows into the second cooler, thereby lowering the temperature of the second cooler the most. It is possible to freeze stably and reliably.

In particular, since the second cooler is located downstream of the cold air of the first cooler, the moisture in the circulating cold air is formed to be removed by the first cooler, thereby minimizing the conception of the coolant.

5. In each of the above inventions, the cold storage of the invention comprises a first cooler and a second cooler provided in a duct, and the compressor, the condenser, the pressure reducing device, the second cooler, and the first cooler are connected in an annular fashion in order. The coolant circuit of the cooling device is configured, and a coolant is provided in the second cooler and disposed on the upstream side of cold air in the duct.

According to the fifth aspect of the present invention, in addition to the above-described inventions, a cooler comprises a first cooler and a second cooler installed in a duct, and a compressor, a condenser, a pressure reducing device, a second cooler, and a first cooler are connected in turn in an annular manner to cool the refrigerant of the cooling device. In addition to configuring the circuit, the second cooler was provided with a coolant and disposed on the upstream side of the cold air in the duct. Thus, the refrigerant depressurized by the decompression device first flows into the second cooler, whereby the temperature of the second cooler is lowered most. It is possible to freeze the coolant stably and reliably.

In particular, since the second cooler is located on the upstream side of the cold air of the first cooler, a cold air having a high temperature that has cooled the inside of the reservoir is blown into the coolant to accelerate the melting of the coolant.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing. 1 is a front view of a cooling reservoir 10 to which the present invention is applied, FIG. 2 is a longitudinal side view of the cooling reservoir 10, and FIG. 3 shows a refrigerant circuit diagram of the cooling apparatus 21, respectively.

The cold storage 10 of the embodiment is a so-called showcase of the rich doll, and is composed of a heat insulation box member 11 that opens on the front face. The front opening of the heat insulation box member 11 is closed by the opening and closing glass doors 18 and 18 so that opening and closing is possible. Moreover, the partition plate 12 is affixed in the inside of the heat insulation box member 11 at predetermined intervals, and the inside of the partition plate 12 turns into the storage 15 (storage chamber).

In the storage 15, a plurality of shelves 17 are arranged at predetermined intervals, and the products are arranged on the shelves 17 so as to be cooled and stored. 20 is a fluorescent lamp for illuminating the inside of the reservoir 15, and is attached to both sides of the inside of the reservoir 15. 19 and 19 are handles for opening and closing the glass doors 18 and 18.

A duct 14 is configured between the partition plate 12 and the heat insulation box member 11. In the lower part of this duct 14, the 1st cooler 26 (a tube shape) which comprises a part of cooling device 21 is installed in a longitudinal direction, and above the 1st cooler 26 at predetermined intervals. The second cooler 27 is provided in the duct 14 in the longitudinal direction.

In addition, a blower 28 is installed in the upper portion of the duct 14 to be the upper side of the second cooler 27 to suck cold air from the lower duct 14 and discharge and circulate cold air in the front reservoir 15. It is. That is, the second cooler 27 is arranged in the duct 14 on the downstream side of the cold air of the first cooler 26. In addition, the blower 28 is always operated during operation of the cooling reservoir 10, and 16 is a drainage hole.

Moreover, the machine room 30 is provided below the heat insulation box member 11, and inside this machine room 30, the compressor 22, such as a reciprocating type, a rotary type, or a scroll type which comprises a part of the cooling apparatus 21, is provided. ), A condenser 23 and a blower 24 for the condenser are provided. In this case, the condenser 23 is provided in the machine room 30 front side, and the suction type condenser blower 24 is provided between this condenser 23 and the compressor 22.

On the other hand, the refrigerant circuit of the cooling device 21, as shown in Fig. 3, the discharge side of the compressor 22, the condenser 23, the pressure reducing device 25 (expansion valve or capillary tube), the second cooler 27 ), And the suction side of the 1st cooler 26 and the compressor 22 are connected in an annular order by piping. The second cooler 27 is composed of an evaporating pipe 31 connected between the pressure reducing device 25 and the first cooler 26 and a coolant 29 installed in a heat exchangeable manner. 29 is comprised so that attachment and detachment are possible with the evaporation pipe 31.

Here, the cool storage 29 is, for example, a Chilfest (trade name) manufactured by Nippon Keimin Co., Ltd., and is configured to freeze by cooling for a predetermined time and to store cold heat. Then, when the coolant 29 is melted, the surrounding environment can be cooled to a predetermined temperature by latent heat.

The cooling device 21 is run controlled by a control device 32 composed of a microcomputer or the like.

When the cooling device 21 is operated, cold air in the duct 14 is sucked upward by the blower 28, and discharged and circulated in the front reservoir 15. That is, the air in the duct 14 is cooled by exchanging heat with the first cooler 26 and the second cooler 27 in order, and then blows the upper portion of the inside of the reservoir 15. The cool air circulates in the reservoir 15 from above to below to cool the goods, and then performs circulation (in-drawing arrows) that is sucked into the duct 14 rather than the front lower part. The coolant 29 is connected immediately after the pressure reducing device 25, and is cooled by the evaporation pipe 31 which is lower than the first cooler 26.

In the above configuration, the operation will be described next with reference to FIG. The control device 32 is a sensor (not shown) for detecting the temperature of the inside of the reservoir 15 (hereinafter referred to as the temperature in the reservoir) or the temperature of cold air discharged from the duct 14 into the reservoir 15. In the embodiment, the temperature in the reservoir is detected. When the compressor 22 is operated by the control device 32, the high temperature and high pressure gas refrigerant discharged from the compressor 22 flows into the condenser 23, radiates heat there, and condenses the liquid. The gas refrigerant condensed and condensed by the condenser 23 is reduced in pressure by the decompression device 25, and then evaporated by the evaporation pipe 31 of the second cooler 27 to absorb heat from the surroundings, thereby exerting a cooling effect. Cool freeze (29). Next, the remaining refrigerant flows into the first cooler 26, and evaporates therein to absorb the heat from the surroundings, thereby exerting a cooling effect.

That is, the cold air circulating in the duct 14 is cooled by the first cooler 26 and cooled by the second cooler 27. In addition, the refrigerant leaving the first cooler 26 is sucked into the compressor.

When the temperature in the reservoir rises and reaches the upper limit of t1 (for example, + 5 ° C), the control device 32 starts the compressor 22 and starts operation. When the temperature in the reservoir decreases by cooling and reaches t2 (for example, 0 ° C) which is the lower limit of the set temperature, the compressor 22 is stopped (OFF). By repeating this, the inside of the reservoir 15 of the cooling reservoir 10 is maintained at a set temperature in the range of t1 to t2. In other words, the control device 32 normally controls the temperature in the reservoir to the refrigerating temperature of t1 to t2 and freezes the coolant 29.

Next, during peak power hours during the summer day (for example, between 13:00 and 16:00), the control device 32 forcibly stops the compressor 22 (OFF), and the blower 28 operates. Continue. In this case, the air circulating in the reservoir 15 is cooled by the latent heat of fusion of the coolant 29 when passing through the range of the second cooler 27 accumulator 29 installed in the duct 14. Thus, the interior 15 of the reservoir is cooled by the coolant 29.

On the other hand, during the operation stop of the compressor 22 during the power peak period, for example, the glass door 18 is frequently opened and closed, such that the inside temperature of the reservoir rises, and the temperature is higher than t1, for example, + 10 ° C. ), The control device 32 starts (ON) the compressor 22 to start operation despite the forced stop (dotted line in the drawing). In this manner, the coolant 29 is cooled by the second cooler 27, and the inside of the reservoir 15 is cooled by the cooling action of both coolers 26 and 27.

When the temperature inside the reservoir decreases during operation of the compressor 22 and reaches a low temperature t4 such as + 3 ° C higher than t2, the control device 32 stops the operation of the compressor 22 (OFF). . Thereafter, only the blower 28 is operated as described above, and the inside of the reservoir 15 is cooled by the latent heat of fusion of the coolant 29. That is, the control apparatus 32 operates the compressor 22, and performs cooling by both coolers 26 and 27, even when the temperature in a reservoir becomes abnormally high even in an electric power peak time slot.

This makes it possible to stop the operation of the compressor 22 during a period when the demand power peaks while maintaining the inside of the reservoir 15 at a predetermined temperature due to the latent heat of fusion of the coolant 29.

Moreover, since the refrigerant depressurized by the decompression device 25 is first introduced into the second cooler 27, the temperature of the second cooler 27 can be lowered most. As a result, the coolant 29 can be reliably frozen, and the inside of the reservoir 15 can be stably cooled by the latent heat of fusion of the coolant 29.

Moreover, since the 2nd cooler 27 is provided in the cold air downstream of the 1st cooler 26, the moisture in circulation cold air can be removed by the 1st cooler 26. As shown in FIG. As a result, the conception of the coolant 29 can be minimized. In addition, since it is possible to cool the inside of the reservoir 15 while defrosting the first cooler 26 by operating the blower 28 in a state where the operation of the compressor 22 is stopped, the first cooler 26. So-called off cycle defrosting can also be performed.

Next, another embodiment of the cooling reservoir 10 is shown in FIG. In this case, the second cooler 27 is installed in the duct 14 below the reservoir 15. And the 2nd cooler 27 mentioned above is comprised with the evaporation pipe 31 between the decompression device 25 and the 1st cooler 26, and the coolant 29 installed so that heat exchange was possible. In addition, since the other structure is the same as that mentioned above, description is abbreviate | omitted.

That is, in this case, since the 2nd cooler 27 is arrange | positioned in the duct 14 upstream of the cold air of the 1st cooler 26, the cold air with high temperature after cooling the inside of the reservoir 15 is a coolant 29 ), And it becomes possible to promote the fusion of the heat storage coolant (29).

In addition, in the embodiment, the compressor 22 is stopped at the peak peak time during which the power consumption is maximized during the day, and the inside of the reservoir 15 is cooled by the cold heat stored in the coolant 29. In addition, the compressor 22 may be stopped in a time zone (for example, in the evening) in which other power consumption is large.

As described above, according to the present invention, in the cooling reservoir formed by cooling the inside of the reservoir with the cooler constituting the cooling apparatus, the cooling apparatus is controlled based on the temperature in the reservoir or the cold air temperature circulated into the reservoir and the set temperature. The control device and the coolant installed in the cooler so as to be heat-exchangable, the control device stops the operation of the cooling device, the operation of the blower is continued while the demand power peaks, so that the demand power peaks The period can contribute to the leveling of demand power by stopping the cooling device while maintaining the cooling capacity in the reservoir by the latent heat of fusion of the coolant.

In particular, since the cooling machine is also defrosted in the period during which the cooling device is stopped, it is also possible to omit a special defrosting device such as a defrost heater.

According to the present invention, in the period in which the demand power peaks, when the temperature in the reservoir or the temperature of the cold air circulated in the reservoir reaches a predetermined high temperature higher than the upper limit of the set temperature, the control device stops the operation of the cooling device. Since it is made to start, when the temperature rises to the said high temperature, such as the temperature in a reservoir, during the period in which operation | movement of a cooling apparatus is stopped, operation of a cooling apparatus will start and cooling operation by a cooler will be resumed.

Therefore, frequent entry and exit of articles in the storage and the like within the period of stopping the cooling device can be performed, and the inside of the storage can be surely cooled even when the temperature in the storage is abnormally raised.

According to the invention, in the period in which the demand electric power peaks, after the operation of the cooling device starts, the temperature in the reservoir or the temperature of the cold air circulated into the reservoir reaches a predetermined low temperature higher than the lower limit of the set temperature. In this case, since the control device stops the operation of the cooling device, it is possible to minimize the operation of the cooling device due to the abnormal temperature rise and to suppress the increase in the power consumption during the period when the demand power peaks. will be.

According to the invention, each of the above inventions comprises a cooler having a cooler installed in a duct and a second cooler, and the compressor, the condenser, the pressure reducing device, the second cooler, and the first cooler are connected in an annular manner in order to connect the refrigerant to the cooling device. At the same time, the second cooler was provided with a coolant and disposed on the downstream side of the cold air in the duct, so that the refrigerant depressurized by the pressure reducing device first flowed into the second cooler, thereby lowering the temperature of the second cooler the most. It is possible to freeze stably and surely.

In particular, since the second cooler is located downstream of the cold air of the first cooler, the moisture in the circulating cold air is formed to be removed by the first cooler, thereby minimizing the conception of the coolant.

According to the fifth aspect of the present invention, in addition to the above-described inventions, a cooler comprises a first cooler and a second cooler installed in a duct, and a compressor, a condenser, a pressure reducing device, a second cooler, and a first cooler are connected in turn in an annular manner to cool the refrigerant of the cooling device. In addition to the circuit configuration, the second cooler was provided with a coolant and disposed on the upstream side of the cold air in the duct. Thus, the refrigerant depressurized by the pressure reducing device first flows into the second cooler, thereby lowering the temperature of the second cooler the most. It is possible to freeze stably and reliably.

In particular, since the second cooler is located on the upstream side of the cold air of the first cooler, the cold air having a high temperature that has cooled the inside of the reservoir is blown into the coolant, and the melting of the coolant can be promoted.

Claims (5)

In the cooling reservoir formed by cooling the inside of the reservoir with a cooler constituting the cooling device, And a control device for controlling the cooling device based on the temperature in the storage room or the temperature of the cold air circulated in the storage room and a set temperature, and a coolant installed in the refrigerator so as to exchange heat. Cooling storage, characterized in that the operation of the cooling device is stopped during the peak period, the operation of the blower is continued. The control apparatus according to claim 1, wherein, in a period in which the demand power peaks, when the temperature in the reservoir or the temperature of the cold air circulated in the reservoir reaches a predetermined high temperature higher than the upper limit of the set temperature, the control device stops the operation of the cooling apparatus. Cooling storage, characterized in that the starting. The temperature in the storage compartment or the temperature of the cold air circulated into the storage chamber reaches a predetermined low temperature higher than the lower limit of the set temperature after the operation of the cooling device is started in a period in which the demand power peaks. And the control device stops the operation of the cooling device. The cooler according to claim 1, 2 or 3, wherein the cooler comprises a first cooler and a second cooler installed in the duct, and the compressor, the condenser, the pressure reducing device, the second cooler, and the first cooler are sequentially annular. A pipe is connected to form a refrigerant circuit of the cooling device, and the second cooler is provided with a coolant to be disposed downstream of the cold air in the duct. The cooler according to claim 1, 2 or 3, wherein the cooler comprises a first cooler and a second cooler installed in the duct, and the compressor, the condenser, the pressure reducing device, the second cooler, and the first cooler are sequentially annular. A pipe is connected to constitute a refrigerant circuit of the cooling device, and the second cooler is provided with a coolant and disposed on an upstream side of cold air in the duct.

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