KR100412533B1 - Showcase and Operating Control Method of The Same - Google Patents

Abstract

In addition to maintaining a constant internal temperature, it is possible to maintain a different temperature for each display space formed by each display shelf to form a suitable storage temperature for a variety of products, formed in the "c" shape and the front is open An outer case, an inner case which is installed at a predetermined distance from the outer case, and which is opened at the front, a plurality of display shelves which are installed in multiple stages on the vertical part of the inner case and form a display space where goods are displayed, and an outer case And an intermediate case which is installed between the vertical surfaces of the inner case and the curtain circulation passage through which air for air curtain circulates between the outer case and a cooling circulation passage through which the cooling circulation air circulates between the inner case and the inner case. , Which is installed in the curtain circulation passage and forcibly generates air flow to form an air curtain in the open front of the inner case. Refrigeration comprising an air curtain blower, a plurality of cooling circulation blowers installed in the cooling circulation passage and circulating air in each display space, and a plurality of evaporators installed in pairs corresponding to each display space in the cooling circulation passage. Provide a showcase that includes the system.

Description

Showcase and Operating Control Method of The Same}

The present invention relates to a showcase and a method for controlling the operation thereof, and by installing a pair of evaporators in each display space, the other one performs a freezing / refrigerating function during defrosting, so that the internal temperature is small and the display space is different for each display space. The present invention relates to a showcase capable of maintaining different storage temperatures and a method for controlling the operation thereof.

In general, showcase is a product applied with a refrigeration system that can store and store frozen and refrigerated foods or products fresh for a long time, and is mainly used in stores, supermarkets, large discount stores, shopping centers, and greengrocery stores. Since the showcase is mainly used for the sale of goods, it is possible to store frozen or refrigerated foods or goods fresh for a long time, as well as to facilitate the display or purchase of goods.

The showcase as described above has a horizontal type to display and take out goods upwards by installing horizontally, and a vertical type to display and take out goods forward by installing vertically. In addition, the showcase is provided with a door installed at the entrance and an open type to form an air curtain without installing the door.

Conventional showcase is composed of a frame constituting the skeleton, a partition installed in the frame to divide the display area, and a refrigeration system for maintaining the internal temperature in a predetermined range.

The partition is used as a shelf for displaying goods in the vertical case.

The refrigeration system is applied to a well-known general system consisting of a compressor, a condenser, an expansion valve, an evaporator, and includes a blower for forcibly generating the flow of air.

In addition, the frame is formed with a passage through which air, which flows are formed by the blower, is circulated.

Recently, with the establishment of department stores and large discount stores, the size of showcases is being manufactured and installed.

In the showcase as described above, if the refrigeration system is continuously operated, freezing occurs on the surface of the evaporator to be cooled, thereby lowering the cooling performance. Therefore, the conventional showcase installs a defrost heater or a bypass circuit as a defrosting means for removing frost generated on the surface of the evaporator.

In the conventional showcase made as described above, the temperature inside the core during defrosting (defrosting of the evaporator) rises, causing a change in the quality of the product.

And when the showcase is made large and large, and displays various kinds of products at the same time, the storage temperature is separated by simply dividing the display position up and down, but this alone is very difficult to control the storage temperature suitable for each product. .

An object of the present invention is to solve the problems as described above, by maintaining a constant internal temperature by installing a pair of evaporators to correspond to the display shelf installed in multiple stages and performing defrost in turn in turn It is possible to maintain a different temperature for each display space formed by each display shelf to provide a showcase that can provide a storage temperature suitable for a variety of products and its operation control method.

1 is a side cross-sectional view showing an embodiment of a showcase according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

Figure 4 is a block diagram showing one embodiment of a refrigeration system according to the present invention.

5 is a block diagram showing another embodiment of a refrigeration system according to the present invention.

Figure 6 is a flow chart showing a method of controlling the operation of the showcase according to the invention in one embodiment of the refrigeration system according to the present invention.

7 is a flow chart showing a method of controlling the operation of a showcase according to another embodiment of the refrigeration system according to the present invention.

The showcase proposed by the present invention has a box-shaped outer case whose cross-sectional shape is formed in a substantially "c" shape and the front side is opened, and is installed at a predetermined distance from the outer case and has a cross-sectional shape of a "c" shape. A plurality of display shelves formed in a box-shaped inner case having an open front side, installed in multiple stages at predetermined intervals in the vertical part of the inner case, and forming a display space in which goods are displayed; A plurality of cooling circulations installed between vertical surfaces of the inner case and forming one or more curtain circulation passages through which air for air curtain circulates between the outer case and the cooling circulation air circulates between the inner case and the inner case; An intermediate case forming a passage, and a horizontal portion of the curtain circulation passage between the outer case and the inner case or the intermediate case with the outer case At least one air curtain blower installed in the vertical portion of the curtain circulation passage between the air gaps and forcibly generating air to form an air curtain in the open front of the inner case, and between the intermediate case and the inner case vertical plane. And a refrigeration system including a plurality of cooling circulation blowers installed in the cooling circulation passage and circulating air in each display space, and a plurality of evaporators installed in pairs corresponding to each display space in the cooling circulation passage. .

Above the outer case and the inner case is formed a discharge port through which the air in the curtain circulation passage is discharged toward the display of the goods, and the inlet under which the air on the side where the goods are displayed is sucked under the outer case and the inner case. Form.

The air curtain is formed by suctioning the air discharged from the discharge port into the suction port.

The refrigeration system includes a plurality of evaporators for receiving a refrigerant to evaporate the gas phase by heat exchange, a compressor for compressing and supplying a refrigerant supplied from the evaporator, and a refrigerant compressed by the compressor to provide a liquid phase by heat exchange. And a condenser for condensing in the air, an expansion valve supplied with the refrigerant condensed in the condenser, expanded at a low pressure, installed in correspondence with each of the evaporators, and defrosting means for defrosting the evaporator.

In addition, the operation control method of the showcase proposed by the present invention is an air circulation operation for generating air flow by operating the air curtain blower and the cooling circulation blower, and circulating the refrigerant by operating the compressor of the refrigeration system Cooling operation for cooling the display space by the flow of air by the cooling circulation blower, and when the frost occurs in the evaporator of the refrigeration system, the cooling efficiency is lowered to one of the pair of evaporators The evaporator consists of a defrosting operation that continues to cool and defrost the other evaporator that is highly frosted.

Next, a preferred embodiment of a showcase and a driving control method thereof according to the present invention will be described in detail with reference to the drawings.

First, an embodiment of a showcase according to the present invention is as shown in Figures 1 to 4, the cross-sectional shape is formed in a substantially "C" shape, the front of the box-shaped outer case 10 and the outer case described above The inner case 11, which is installed at a predetermined interval from the 10, and has a cross-sectional shape having a substantially "c" shape, and whose front side is opened, and a predetermined interval in the vertical portion of the inner case 11 described above. The outer case is installed between the plurality of display shelves 20 and the vertical surface of the outer case 10 and the inner case 11, which are installed in multiple stages and form a display space 22 in which goods are displayed. A plurality of curtain circulation passages (12) in which at least one curtain circulation passage (12) through which air for the air curtain circulates and (10) is circulated with the inner case (11), Intermediate case 13 forming (36) and (37), and the above-mentioned The horizontal portion of the curtain circulation passage 12 between the subcase 10 and the inner case 11 or the vertical portion of the curtain circulation passage 12 between the outer case 10 and the intermediate case 13; At least one air curtain blower 30 for forcibly generating air to form an air curtain in the open front of the inner case 11, and the intermediate case 13 and the inner case 11 between the vertical plane. A plurality of cooling circulation blowers 31 and 32 installed in the cooling circulation passages 35, 36, and 37 for circulating air in each display space 22, and the cooling circulation passage 35 described above. ), (36), and (37) includes a refrigeration system (40) comprising a plurality of evaporators (41), (42) installed in pairs corresponding to each display space (22).

In the above-described plurality of evaporators 41 and 42, the first evaporator 41 and the second evaporator 42 are arranged in pairs in each display space 22, and the cooling circulation blower 31 is installed. The first and second blowers 31 and 32 are provided in pairs corresponding to the first and second evaporators 41 and 42, respectively.

Above the outer case 10 and the inner case 11, as shown in Fig. 1, the discharge port 14 for discharging the air in the curtain circulation passage 12 to the goods display side is formed.

In addition, the inlet 16 is formed below the outer case 10 and the inner case 11 through which the air on the side where the goods are displayed is sucked.

An air curtain is formed by the air discharged from the discharge port 14 being sucked into the suction port 16, and the air curtain cuts off between the low temperature air inside and the high temperature air outside.

As shown in FIG. 3, the air in each display space 22 is sucked toward the plurality of first evaporators 41 and the second evaporators 42, respectively, on the vertical surface 18 of the inner case 11. A plurality of grills are provided such that the air cooled while passing through the first evaporator 41 and the second evaporator 42 is discharged to the display space 22 by the first blower 31 and the second blower 32 for cooling circulation, respectively. The hole 19 is formed.

The cooling circulation passages 35, 36, and 37 formed by the inner case 11 and the intermediate case 13 are each of the grill holes 19 and the grill holes 19, as shown in FIG. 1. The cooling air passing through the first evaporator 41 and the second evaporator 42 does not flow into the curtain circulation passage 12 but passes through each of the first and second blowers 31 and 32 for cooling circulation. It is discharged to the grill hole 19 to guide the display space 22 of each layer to circulate. The cooling circulation passages 35, 36 and 37 are blocked by the intermediate case 13 so as not to communicate with the curtain circulation passage 12. Therefore, the curtain circulation passage 12 is not directly communicated with each of the display spaces 22, but only through the discharge port 14 and the suction port 16.

When the intermediate case 13 is formed of a material having excellent thermal conductivity, heat exchange is performed by contacting the cooled air while passing through the first evaporator 41 and the second evaporator 42, and again, the curtain circulation passage ( Since the heat passing through the air passing through 12 and the intermediate case 13 is made, the air forming the air curtain is also cooled.

As described above, the first blower 31 and the second blower 32, the first evaporator 41, and the second evaporator 42 for cooling circulation are paired as shown in FIGS. 1 and 2, respectively. At least one is installed in the circulation passages (35), (36), (37).

As described above, the cooling circulation blowers 31, 32, and / or the evaporators 41, 42 are installed in pairs corresponding to the display space 22 and arranged in pairs.

That is, in the case where the display space 22 is formed to be horizontally long, for example, the display of the bottom layer formed by one display shelf 20 to improve the cooling efficiency and to maintain the temperature at different temperatures for each zone. The space 22 is divided into two or more zones, and a plurality of pairs of cooling circulation blowers 31, 32, and evaporators 41, 42 are provided.

As shown in Fig. 2, the cooling circulation blowers 31, 32, and evaporators 41, 42 are normally cooled on the other side while one side is defrosted by installing the two in correspondence with each other in pairs. Since it is configured to perform, it is configured to maintain a continuous cooling temperature.

In addition, as shown in FIG. 2, when the above-mentioned air curtain blower 30 is formed long horizontally, it is also possible to divide | segment into predetermined area | region, and to install two or more.

As shown in FIG. 4, the refrigeration system 40 includes a plurality of evaporators 41 and 42 which are supplied with a refrigerant and evaporated in the gas phase by heat exchange, and the evaporators 41 and 42 described above. Compressor 47 for compressing and supplying the refrigerant supplied from the), the condenser 48 to receive the refrigerant compressed by the compressor 47 and condensed in the liquid phase by heat exchange, and the condenser 48 To the expansion valves 49 and 50 and the respective evaporators 41 and 42 which are installed in correspondence with the respective evaporators 41 and 42 and are supplied with the supplied refrigerant. And a plurality of defrost heaters 43 and 44 which are defrosting means for performing defrosting.

The expansion valves 49 and 50 are provided in the first evaporator 41 and the second evaporator 42 to correspond to the first expansion valve 49 and the second expansion valve 50, respectively.

In addition, the defrost heaters 43 and 44 include a first defrost heater 43 and a second defrost heater 44 installed corresponding to the first evaporator 41 and the second evaporator 42, respectively. Installed in pairs.

In addition, as shown in FIG. 4, the refrigeration system 40 may include a first defrost valve 45 and a first defrost valve which block the flow of the refrigerant to prevent the refrigerant from being supplied to the expansion valves 49 and 50 during the defrosting. A second defrost valve 46 is provided between each of the first expansion valve 49 and the second expansion valve 50 and the condenser 47 (in front of each of the expansion valves 45 and 46).

Next, an embodiment of the showcase operation control method and an operation process of the showcase according to the present invention made as described above will be described.

First, as shown in FIG. 6, when the power is turned on and the operation is started, the air curtain blower 30 is turned on to forcibly generate a flow of air in the curtain circulation passage 12. The air curtain is formed by discharging to the discharge port 14 and suctioning to the suction port 16, and the above-described first cooling fan 31 and the second blower 32 for cooling circulation are turned on to operate each of the above. The air circulation operation to circulate the air in each display space 22 by forcibly generating a flow of air in the cooling circulation passages (35), (36), (37) of (S10).

In addition, since the compressors 47 of the refrigeration system 40 are turned on to start operation, the refrigerant is circulated to cool the air in contact with the first evaporator 41 and the second evaporator 42. Cooling operation is made (S10).

During the cooling operation, the first defrost valve 45 and the second defrost valve 46 remain open, and the first defrost heater 43 and the second defrost heater 44 are in an off state. Maintain (S10).

During the cooling operation, the refrigerant is compressed by the compressor 47 and supplied to the condenser 48, and the refrigerant condensed into the liquid refrigerant through heat exchange in the condenser 48 is respectively expanded to the expansion valves 49 and 50. And evaporate to gas through heat exchange while passing through each evaporator (41) and (42) in the expanded state at low pressure, and the refrigerant in the gas state flows into the compressor (47) and circulates the above process. do.

At this time, as the air curtain blower 30 is operated, air toward the display space 22 flows in through the suction port 16 and is discharged to the discharge port 14 through the curtain circulation passage 12. The air discharged through the discharge port 14 forms an air curtain that blocks the display space 22 from the outside, and circulation of air introduced into the suction port 16 is performed again.

In addition, as the cooling circulation blowers 31 and 32 operate, the air inside the display space 22 of each layer is the grill holes 19 and the respective evaporators of the vertical surface 18 of the inner case 11. 41 and 42 are introduced into each of the cooling circulation passages 35, 36, and 37 so that cooling is performed.

The air cooled by the heat exchange with each of the evaporators 41 and 42 while flowing into the cooling circulation passages 35, 36 and 37 is cooled by the cooling circulation blowers 31 and 32. According to the operation of the) through the grill hole 19 is discharged back to the display space 22 and the circulation of air for cooling is made.

By differently controlling the operations of the evaporators 41 and 42 provided corresponding to the display spaces 22, it is also possible to maintain the storage temperature of each display space 22 differently.

If frost occurs in the first evaporator 41 or the second evaporator 42 of the refrigerating system 40 during the cooling operation as described above, and the cooling efficiency is lowered, a pair of evaporators 41 and 42 are used. Evaporator (e.g., the second evaporator 42) continues to perform cooling and defrost operation for the other evaporator (e.g., the first evaporator 41) that is highly frosted. Perform (S20).

That is, when frost is formed in each of the evaporators 41 and 42 during the cooling operation as described above and the cooling efficiency is lowered, defrosting of the evaporators 41 and 42 is performed sequentially.

Determination of whether or not to perform the defrost as the cooling efficiency is reduced in the above, for example, by measuring the flow (resistance) of the air passing through the evaporator (41), 42, the flow of air is less than a predetermined set value. If it is not smooth, it can be configured to judge that a lot of frost is generated.

As shown in FIG. 6, the defrosting operation is performed as to whether or not a defrost signal (signal of whether or not the set value is measured by measuring the flow of air) is input to the first evaporator 41 during the normal cooling operation. It is determined whether to start the defrost according to whether or not (S21), and if the defrost signal (defrost start signal) is not input to the first evaporator 41, whether or not the defrost signal for the second evaporator 42 is input again. Accordingly, it is determined whether the defrost is started (S25), and if the defrost signal (defrost start signal) is not input also to the second evaporator 42, normal cooling operation is continued.

When the defrost signal (defrost start signal) for the first evaporator 41 is input in the step S21, the first defrost valve 49 does not exchange heat by evaporation of the refrigerant in the first evaporator 41. To shut off the refrigerant and to prevent the heated air from being discharged into the display space 22 to raise the freezing / refrigerating temperature during the defrosting, the first blower 31 is turned off, and the defrosting is performed. In order to turn on the first defrost heater 43, which is a defrosting means, a defrosting operation of melting and removing frost generated in the first evaporator 41 is performed (S22).

As described above, it is determined whether the defrost of the first evaporator 41 is completed by defrosting (for example, when the defrosting is performed for a predetermined time, it is determined whether the time has elapsed) (S23), and the defrost is not completed. If the defrosting is not performed continuously, if the defrosting is completed, the first defrosting heater 43 is turned off to stop the defrosting operation, and the first defrosting valve is configured to exchange heat by evaporation of the refrigerant in the first evaporator 41. By opening 49, the refrigerant is introduced, and the first blower 31 is turned on so that the cooled air is discharged into the display space 22 and circulated to return to the normal cooling operation (S24).

In addition, when the defrost signal (defrost start signal) for the second evaporator 42 is input in step S25 of determining whether the defrost signal for the second evaporator 42 is input, the second defrost valve 50 may be used. To shut off the refrigerant to the second evaporator 42, turn off the second blower 32 to prevent hot air from being discharged to the display space 22, and defrost to defrost. Since the second defrost heater 44, which is a means, is turned on, defrosting is performed to dissolve and remove frost generated in the second evaporator 42 (S26).

As described above, the defrost proceeds to determine whether the defrost of the second evaporator 42 is completed (S27). If the defrost is not completed, the defrost is continuously performed. If the defrost is completed, the second defrost heater 44 is performed. Turn off the defrosting operation, open the second defrost valve 50 to allow heat exchange by evaporation of the refrigerant in the second evaporator 42, and introduce the refrigerant, and the cooled air is displayed in the display space 22. The second blower 32 is turned on to be discharged and circulated to return to normal cooling operation (S28).

While the defrosting of any one of the first evaporator 41 and the second evaporator 42 constituted as described above, the other is operated to cool the display space 22, so that the display space 22 It is possible to prevent the temperature of) from rising sharply and to maintain a nearly constant freezing / refrigeration temperature.

In the embodiment of the showcase according to the present invention, the defrosting means does not allow the high temperature and high pressure liquid refrigerant supplied from the condenser 48 to pass through the expansion valves 49 and 50, as shown in FIG. It is also possible to provide the bypass pipes 51 and 52 so that they can be directly supplied to the evaporators 41 and 42 without being supplied.

When the bypass pipes 51 and 52 are installed as described above, the high temperature and high pressure liquid refrigerant passing through the evaporators 41 and 42 corresponds to the other evaporators 42 and 41, respectively. The auxiliary connecting pipes 55 and 56 are installed to be supplied to the valves 50 and 49.

That is, the first bypass pipe 51 is installed so that the refrigerant is supplied to the first evaporator 41 without passing through the first expansion valve 49, and the refrigerant does not pass through the second expansion valve 50 and the second evaporator ( A second bypass pipe 52 is installed to be supplied to 42.

At this time, the first bypass pipe 51 and the second bypass pipe 52 branch from the front of the first defrost valve 45 and the second defrost valve 46, and the expansion valve 49, It installs so that it may be aerated between 50 and the evaporator 41 and 42.

The first bypass pipe 51 and the second bypass pipe 52 are provided with a first bypass valve 53 and a second bypass valve 54 capable of opening and closing the flow of the refrigerant, respectively. .

In the above description, the first defrost valve 45 and the second defrost valve 46 and the first bypass valve 53 and the second bypass valve 54 are respectively provided, but the present invention is limited thereto. Instead, the three-way valve is provided at the branch points of the first bypass pipe 52 and the second bypass pipe 52 to bypass the pipes 51, 52, or expansion valves 49, 50. It is also possible to select and change the refrigerant flow in the furnace.

In addition, the first liquid refrigerant between the first evaporator 41, the second evaporator 42 and the compressor 47 can open and close the flow of the refrigerant to prevent the liquid refrigerant from entering the compressor 47, respectively. A shutoff valve 59 and a second liquid refrigerant shutoff valve 60 are provided.

The auxiliary connecting pipes 55 and 56 branch between the first evaporator 41 and the first liquid refrigerant shutoff valve 59, and the first auxiliary connection is aerated in front of the second expansion valve 50. It consists of a pipe 55 and a second auxiliary connecting pipe 56 branching between the second evaporator 42 and the second liquid refrigerant shut-off valve 60 and aerated in front of the first expansion valve 49.

The first auxiliary connecting pipe 55 and the second auxiliary connecting pipe 56 are provided with a first auxiliary valve 57 and a second auxiliary valve 58 that can open and close the flow of the refrigerant, respectively.

In the above description, the first liquid refrigerant blocking valve 59 and the second liquid refrigerant blocking valve 50, the first auxiliary valve 57 and the second auxiliary valve 58 are respectively provided, but the present invention is limited thereto. Rather, the three-way valve is installed at the branch points of the first auxiliary connecting pipe 55 and the second auxiliary connecting pipe 56 to flow the refrigerant to the auxiliary connecting pipe 55, 56, or the compressor 47. It is also possible to select and configure it so that it can be changed.

Next, the operation control method and operation process of the showcase in another embodiment of the showcase according to the present invention for installing the bypass pipes 51 and 52 as the defrost means as described above will be described.

First, as shown in FIG. 7, when the power is turned on and the operation is started, the air curtain blower 30 is turned on, and the cooling circulation first blower 31 and the second blower 32 are operated. The air circulation operation is performed to circulate the air in each display space 22 by forcibly generating a flow of air in each of the cooling circulation passages 35, 36, and 37 described above (S30). .

In addition, since the compressors 47 of the refrigeration system 40 are turned on to start operation, the refrigerant is circulated to cool the air in contact with the first evaporator 41 and the second evaporator 42. Cooling operation is made (S30).

During the cooling operation, the first defrost valve 45 and the second defrost valve 46 remain open, and the first bypass valve 53 and the second bypass valve 54 are closed. State, the first liquid refrigerant cutoff valve 59 and the second liquid refrigerant cutoff valve 60 remain open, and the first auxiliary valve 57 and the second auxiliary valve 58 are kept open. Maintains the closed state (S30).

During the cooling operation, the refrigerant is compressed by the compressor 47 and supplied to the condenser 48, and the refrigerant condensed into the liquid refrigerant through heat exchange in the condenser 48 is respectively expanded to the expansion valves 49 and 50. And evaporate to gas through heat exchange while passing through each of the evaporators 41 and 42 in the expanded state at low pressure, and the refrigerant in the gaseous state circulates the above-described process introduced into the compressor 47. Do it.

When the defrost signal for the first evaporator 41 or the second evaporator 42 is input while performing the normal cooling operation S30 as described above, the defrosting operation is performed (S40).

The defrosting operation determines whether to start the defrost according to whether or not the defrost signal for the first evaporator 41 is input (S41), the defrost signal (defrost start signal) is input to the first evaporator 41 If not, it is again determined whether the defrost is started according to whether or not the defrost signal for the second evaporator 42 is input (S45), and the defrost signal (defrost start signal) is also not input to the second evaporator 42. If not, continue with normal cooling operation.

When the defrost signal (defrost start signal) for the first evaporator 41 is input in the step S41, the first defrost valve 45 is closed and the first bypass valve 53 is opened to open a high temperature. The high pressure liquid refrigerant flows into the first evaporator 41 through the first bypass pipe 51 without passing through the first expansion valve 49 to dissolve and remove the frost. By closing the valve 59 and opening the first auxiliary valve 57 to prevent the liquid refrigerant passing through the first evaporator 41 into the compressor 47, the first auxiliary connecting pipe for evaporation ( 55) flows into the second expansion valve (50), and during the defrosting, the first blower (31) is opened to prevent hot air from being discharged into the display space (22) to raise the freezing / refrigerating temperature. The defrosting operation to turn off (S42).

As described above, the defrost proceeds to determine whether the defrost of the first evaporator 41 is completed (S43). If the defrost is not completed, the defrost is continuously performed, and if the defrost is completed, the heat exchange by evaporation of the refrigerant is performed again. The first defrost valve 45 is opened and the first bypass valve 53 is closed so that the refrigerant flows into the first evaporator 41 through the first expansion valve 49 to perform the first evaporator. The first liquid refrigerant shut-off valve 59 is opened and the first auxiliary valve 57 is closed so that the refrigerant evaporated while passing through the 41 flows into the compressor 47, and the cooled air is displayed in the display space 22. The first blower 31 is turned on so as to be discharged to the circulation and return to normal cooling operation (S44).

In addition, when the defrost signal (defrost start signal) for the second evaporator 42 is input in step S45 of determining whether the defrost signal for the second evaporator 42 is input, the second defrost valve ( 46 is closed and the second bypass valve 54 is opened so that the high temperature and high pressure liquid refrigerant does not pass through the second expansion valve 50 to the second evaporator 42 through the second bypass pipe 52. The liquid refrigerant that has passed through the second evaporator 42 by closing the second liquid refrigerant shutoff valve 60 and opening the second auxiliary valve 58 by dissolving the frost by inflow is removed. While entering the first expansion valve 49 through the second auxiliary connecting pipe 56 for evaporation while preventing the inflow, the heated air is discharged to the display space 22 during the defrosting to freeze / Defrost operation to turn off the second blower 32 in order to prevent the increase in the refrigeration temperature (S46).

As described above, the defrost proceeds to determine whether the defrost of the second evaporator 42 is completed (S47). If the defrost is not completed, the defrost is continuously performed. When the defrost is completed, the heat exchange by evaporation of the refrigerant is performed again. The second defrost valve 46 is opened and the second bypass valve 54 is closed so that the refrigerant flows into the second evaporator 42 through the second expansion valve 50 to perform the second evaporator. The second liquid refrigerant shutoff valve 60 is opened and the second auxiliary valve 58 is closed so that the refrigerant evaporated while passing through the 42 is introduced into the compressor 47, and the cooled air is displayed in the display space 22. The second blower 32 is turned on so as to be discharged to the circulation and return to normal cooling operation (S48).

In the above description of a preferred embodiment of a showcase and a driving control method thereof according to the present invention, the present invention is not limited thereto, and the present invention is not limited thereto. It is possible and this also belongs to the scope of the present invention.

According to the showcase and the operation control method according to the present invention made as described above, during the defrosting of one evaporator of the pair of evaporator is always refrigerated / refrigeration for the display space by the other evaporator is always maintained It is possible to maintain a constant freezing / refrigeration temperature.

In addition, since the air whose temperature rises during defrosting does not immediately flow into the display space, and the temperature does not temporarily rise, it is possible to always store and store the product in a high quality state.

In addition, since the evaporator is installed corresponding to each display space, it is possible to maintain different temperatures according to the products displayed in each display space, and various products can be stored and stored in an optimal state.

Claims (8)

delete delete delete A box-shaped outer case having a cross-sectional shape formed in a "c" shape and having an open front side; A box-shaped inner case installed at a predetermined distance from the outer case and having a cross-sectional shape in a "c" shape and having an open front side; A plurality of display shelves installed in multiple stages at predetermined intervals in the inner case and forming a display space in which goods are displayed; It is installed between the outer case and the vertical surface of the inner case and forms one or more curtain circulation passages through which the air curtain air is circulated between the outer case and the cooling circulation air is circulated between the inner case and the inner case. An intermediate case forming a plurality of cooling circulation passages, It is installed in the horizontal portion of the curtain circulation passage between the outer case and the inner case or the vertical portion of the curtain circulation passage between the outer case and the middle case and generates a flow of air to force the air in the open front of the inner case. One or more air curtain blowers forming a curtain, A plurality of cooling circulation blowers installed in the cooling circulation passage between the intermediate case and the inner case vertical plane, and circulating air in each display space; And a refrigeration system including a plurality of evaporators installed in pairs corresponding to each display space in the cooling circulation passage. The refrigeration system receives a refrigerant and evaporates to the gas phase by heat exchange, and a plurality of evaporators and the first evaporator and the second evaporator are arranged in pairs to correspond to each display space, and the refrigerant supplied from the evaporator A compressor for compressing and supplying, a condenser that receives the refrigerant compressed by the compressor, and condenses it into a liquid phase by heat exchange, and expands and supplies the refrigerant condensed in the condenser at a low pressure. An expansion valve having a first expansion valve and a second expansion valve corresponding to each of the two evaporators, and defrosting means for performing defrosting on the evaporator; The cooling circulation blower is provided with a pair of first blowers and second blowers corresponding to each of the first evaporator and the second evaporator, The defrost means comprises a defrost heater in which the first defrost heater and the second defrost heater are installed in pairs, respectively, installed in correspondence with the first evaporator and the second evaporator. Showcase is provided between the first expansion valve and the second expansion valve and the condenser, the first defrost valve and the second defrost valve for opening and closing the flow of the refrigerant. A box-shaped outer case having a cross-sectional shape formed in a "c" shape and having an open front side; A box-shaped inner case installed at a predetermined distance from the outer case and having a cross-sectional shape in a "c" shape and having an open front side; A plurality of display shelves installed in multiple stages at predetermined intervals in the inner case and forming a display space in which goods are displayed; It is installed between the outer case and the vertical surface of the inner case and forms one or more curtain circulation passages through which the air curtain air is circulated between the outer case and the cooling circulation air is circulated between the inner case and the inner case. An intermediate case forming a plurality of cooling circulation passages, It is installed in the horizontal portion of the curtain circulation passage between the outer case and the inner case or the vertical portion of the curtain circulation passage between the outer case and the middle case and generates a flow of air to force the air in the open front of the inner case. One or more air curtain blowers forming a curtain, A plurality of cooling circulation blowers installed in the cooling circulation passage between the intermediate case and the inner case vertical plane, and circulating air in each display space; And a refrigeration system including a plurality of evaporators installed in pairs corresponding to each display space in the cooling circulation passage. The refrigeration system receives a refrigerant and evaporates to the gas phase by heat exchange, and a plurality of evaporators and the first evaporator and the second evaporator are arranged in pairs to correspond to each display space, and the refrigerant supplied from the evaporator A compressor for compressing and supplying, a condenser that receives the refrigerant compressed by the compressor, and condenses it into a liquid phase by heat exchange, and expands and supplies the refrigerant condensed in the condenser at a low pressure. An expansion valve having a first expansion valve and a second expansion valve corresponding to each of the two evaporators, and defrosting means for performing defrosting on the evaporator; The cooling circulation blower is provided with a pair of first blowers and second blowers corresponding to each of the first evaporator and the second evaporator, Between the first expansion valve and the second expansion valve and the condenser is provided a first defrost valve and a second defrost valve for opening and closing the flow of the refrigerant, The defrosting means includes a first bypass pipe and a second bypass pipe installed to supply the high temperature and high pressure liquid refrigerant supplied from the condenser to the first evaporator and the second evaporator without passing through the first expansion valve and the second expansion valve. A first bypass valve and a second bypass valve installed in the pass pipe, the first bypass pipe and the second bypass pipe to open and close the flow of the refrigerant, and the first evaporator and the second evaporator. The first liquid refrigerant shutoff valve and the second liquid refrigerant shutoff valve, which are installed between the compressors and open and close the flow of the refrigerant, branch between the first evaporator and the first liquid refrigerant shutoff valve and are agglomerated at the front of the second expansion valve. A second auxiliary connector pipe branched between the second evaporator and the second liquid refrigerant shut-off valve and aerated in front of the first expansion valve, and the first auxiliary connector pipe and the second valve Installed in the auxiliary connector and the flow of refrigerant A showcase comprising a first auxiliary valve and a second auxiliary valve to open and close. delete A plurality of display shelves, which are installed in multiple stages at predetermined intervals and form a display space for displaying goods, form a curtain circulation passage between the outer case and the vertical surface of the inner case, and form a cooling circulation passage between the inner case. The intermediate case, the air curtain blower installed in the curtain circulation passage, the plurality of cooling circulation first blowers and the second blower installed in the circulation circulation passage, and the first evaporator and the second evaporator are configured in pairs A first expansion valve and a second expansion valve are installed to correspond to the first evaporator and the second evaporator, respectively. A refrigeration system comprising an expansion valve and defrost means for defrosting the first evaporator and the second evaporator, wherein the first evaporator The first defrost heater and the second defrost heater are installed in pairs to correspond to the second evaporator, respectively, and are configured to block the flow of the refrigerant between the first expansion valve, the second expansion valve, and the condenser. In a showcase in which a first defrost valve and a second defrost valve are installed, The air circulation operation to generate air flow by operating the air curtain blower and the cooling circulation blower, and the flow of air by the cooling circulation blower as described above by activating the compressor of the refrigeration system to circulate the refrigerant When the frost occurs in the evaporator of the refrigerating system and the cooling efficiency is lowered, one of the pair of evaporators continues to cool and the other evaporator that has generated a lot of frost It consists of defrosting operation to perform defrosting, In the air circulation operation, the air curtain blower is turned on to generate an air curtain by forcibly generating air flow in the curtain circulation passage, and the first blower and the second blower for cooling circulation are turned on. It is operated to generate a flow of air forcibly in each of the cooling circulation passages to circulate the air in each display space, In the cooling operation, the first defrost valve and the second defrost valve remain open, the first defrost heater and the second defrost heater remain off, and the compressor of the refrigeration system is turned on. It is made so as to circulate the refrigerant to perform cooling for the air in contact with the first evaporator and the second evaporator, The defrosting operation determines whether to start the defrosting according to whether the defrosting signal for the first evaporator is input while performing the cooling operation, and if the defrosting signal is not input to the first evaporator, the defrosting for the second evaporator again. It is determined whether to start the defrost according to whether a signal is input, and if the defrost signal is not input to the second evaporator, the cooling operation is continuously performed. When the defrost signal for the first evaporator is input, the first defrost valve is opened. Defrost the first blower, turn off the first blower and turn on the first defrost heater to dissolve and remove the frost generated in the first evaporator, determine whether the defrost for the first evaporator is completed, If the defrost is not completed, continue defrosting. If the defrost is completed, turn off the first defrost heater, open the first defrost valve, and turn on the first blower. When the defrost signal for the second evaporator is inputted, the second defrost valve is closed, the second blower is turned off, and the second defrost heater is turned on to melt and remove the frost generated in the second evaporator. Proceed with defrosting, determine whether defrosting for the second evaporator is completed, continue defrosting if the defrosting for the second evaporator is not completed, turn off the second defrost heater if the defrosting is completed, and A method of controlling a showcase in which a defrost valve is opened and a second blower is turned on to return to a cooling operation. A plurality of display shelves, which are installed in multiple stages at predetermined intervals and form a display space for displaying goods, form a curtain circulation passage between the outer case and the vertical surface of the inner case, and form a cooling circulation passage between the inner case. The intermediate case, the air curtain blower installed in the curtain circulation passage, the plurality of cooling circulation first blowers and the second blower installed in the circulation circulation passage, and the first evaporator and the second evaporator are configured in pairs A first expansion valve and a second expansion valve are installed to correspond to the first evaporator and the second evaporator, respectively. A refrigeration system comprising an expansion valve and defrosting means for defrosting the first and second evaporators; And a first defrost valve and a second defrost valve are installed between the second expansion valve and the condenser, and the first evaporator and the second expansion valve are not passed through the first expansion valve and the second expansion valve without passing the high temperature and high pressure liquid refrigerant supplied from the condenser. A first bypass valve and a second bypass pipe are installed so that the second bypass pipe can be supplied to the second evaporator, and the refrigerant flow is opened and closed in the first bypass pipe and the second bypass pipe, respectively. By-pass valves are installed, and a first liquid refrigerant shutoff valve and a second liquid refrigerant shutoff valve are respectively installed between the first evaporator, the second evaporator and the compressor, and the first evaporator and the first liquid refrigerant shutoff valve are respectively provided. A second auxiliary connecting pipe branching between the first expansion valve and the second auxiliary valve for aeration in front of the second expansion valve, and branching between the second evaporator and the second liquid refrigerant shut-off valve and aeration in front of the first expansion valve. Install the connector, and the first report above In the showcase to install the connector, and the second auxiliary connection pipe the first auxiliary valve and the second auxiliary valve to open and close respectively the flow of the refrigerant in, The air circulation operation to generate air flow by operating the air curtain blower and the cooling circulation blower, and the flow of air by the cooling circulation blower as described above by activating the compressor of the refrigeration system to circulate the refrigerant When the frost occurs in the evaporator of the refrigerating system and the cooling efficiency is lowered, one of the pair of evaporators continues to cool and the other evaporator that has generated a lot of frost It consists of defrosting operation to perform defrosting, In the air circulation operation, the air curtain blower is turned on to generate an air curtain by forcibly generating air flow in the curtain circulation passage, and the first blower and the second blower for cooling circulation are turned on. It is operated to generate a flow of air forcibly in each of the cooling circulation passages to circulate the air in each display space, In the cooling operation, the first defrost valve and the second defrost valve maintain the open state, and the first bypass valve and the second bypass valve maintain the closed state, and the first liquid refrigerant shutoff valve and The second liquid refrigerant shutoff valve is kept open and the first and second auxiliary valves are kept closed and the compressor of the refrigeration system is turned on to start operation. To cool the air in contact with the first evaporator and the second evaporator, The defrosting operation determines whether to start the defrost according to whether or not the defrost signal for the first evaporator is input, and if the defrost signal is not input to the first evaporator, the defrost signal for the second evaporator is input again. If the defrost signal is not input to the second evaporator, the cooling operation is continuously performed. If the defrost signal for the first evaporator is input, the first defrost valve is closed. Open the first bypass valve, close the first liquid refrigerant shut-off valve, open the first auxiliary valve), defrost the first blower, and verify that the defrost for the first evaporator is completed. If it is determined that the defrost is not completed, the defrost is continued. If the defrost is completed, the first defrost valve is opened and the first bypass valve is closed. Open the refrigerant shutoff valve, close the first auxiliary valve, turn on the first blower to return to cooling operation, and when the defrost signal for the second evaporator is input, close the second defrost valve and close the second bypass valve. Open and close the second liquid refrigerant shut-off valve, open the second auxiliary valve and perform the defrost operation to turn off the second blower, determine whether the defrost for the second evaporator is completed, If the defrost is not completed, continue defrosting, if the defrost is completed, open the second defrost valve, close the second bypass valve, open the second liquid refrigerant shut-off valve and close the second auxiliary valve A method for controlling operation of a showcase configured to turn on a second blower to return to a cooling operation.