JP2008151439A - Storage device and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a showcase capable of shortening a defrosting time. <P>SOLUTION: The showcase 1 has a display compartment 3, a supply duct 21, a suction duct 22, and a connection duct 23 connecting the suction duct 22 and the supply duct 21. The connection duct 23 includes an evaporator 31 and an air distribution fan 32, and the showcase 1 has a condenser 42, a compressor 41, a hot gas bypass valve 35, and electric heaters 33a, 33b disposed on a bottom surface of the connection duct 23. In the showcase 1, the air distribution fan 32 is stopped, the compressor 41 is driven, the evaporator 31 is heated by opening the hot gas bypass valve 35, and the connection duct 23 is heated by turning the electric heaters 33a, 33b on, in a defrosting mode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a storage device such as a showcase suitable for displaying products in a cooled or frozen state and a control method thereof.

  In Patent Document 1, in a flat type freezer / refrigeration open showcase, a defrost heater is attached to a cooler, and a defrost operation for energizing the defrost heater in a defrost operation and a draining operation after the defrost operation is completed. It is described that it comprises.

In Patent Document 2, when the defrosting operation of the refrigerator for the refrigerator compartment is performed, the fan for the refrigerator compartment is also operated. It is described that the room fan is effectively compensated for and the defrosting time is shortened.
JP 2002-277145 A JP 2002-81844 A

  By driving the fan for supplying the air cooled by the cooler to the refrigerator or freezer even during defrosting, the air heated by the defrosting heater circulates, so the defrosting time can be shortened. . However, on the other hand, since the air heated by the defrosting heater is also supplied to the refrigerator or freezer, the internal temperature rises. When the temperature in the refrigerator rises, there is a possibility that products that are refrigerated or frozen are affected. Even if the increase in the internal temperature is limited by shortening the defrosting time and the influence on the refrigerated or frozen product is minimized, the internal temperature that has increased due to the defrosting can be defrosted. It needs to be lowered after completion, which consumes extra energy.

  In flat frozen open showcases such as ice cream cases, a large amount of outside air is sucked in when making an air curtain, so frost tends to form on the cooler. Therefore, it is necessary to frequently perform a defrosting operation, and it is important to suppress as much as possible the rise in the internal temperature during the defrosting.

  One aspect of the present invention includes a display chamber for displaying commodities in a refrigerated and / or frozen state, a supply duct for supplying cold air to the display chamber, and a suction duct for sucking air from the display chamber And a connecting device that connects the suction duct and the supply duct. The connection duct includes at least an evaporator for cooling the sucked air and a fan for blowing air. The storage device further includes a condenser for cooling the refrigerant, and a compressor for compressing the refrigerant and supplying the refrigerant cooled by the condenser to the evaporator. The storage device further includes a control unit including repeatedly controlling a cool air supply mode for supplying cool air to the display room and a defrost mode for performing defrosting of the evaporator. A cool air supply control function including driving the fan and the compressor, and a defrost control function including stopping the fan for blowing air.

  In this storage device, the fan for blowing is stopped when defrosting is performed by the defrosting control function of the control unit. By forcibly stopping the fan for blowing air that supplies cold air to the display chamber, it is possible to suppress supply of air whose temperature rises in the connection duct to the display chamber during defrosting.

  By stopping the fan for blowing air by the defrost control function, it becomes difficult to defrost the evaporator or the like entirely using the air heated by the defrost heater. Conversely, by stopping the fan for blowing air, it becomes difficult for hot air to be supplied to the display room, so individual elements that require defrosting, for example, an evaporator and a predetermined part (region or place) of the duct are individually provided. To a high temperature in a limited range. Therefore, defrosting can be performed in a short time, and an increase in the temperature of the display chamber during defrosting can also be suppressed.

  For this reason, the storage device further includes a first electric heater for heating at least a part of the bottom surface of the connection duct, and the cold air supply control function of the control unit turns off the first electric heater and removes it. The frost control function preferably turns on the first electric heater. An example of the first electric heater is a heater disposed outside or inside a part of the bottom surface of the connection duct. Another example of the first electric heater is a sheathed heater arranged so that radiant heat reaches the bottom surface of the connection duct. One example of intensive heating when the evaporator is defrosted is to provide a hot gas bypass valve that guides the refrigerant before it is compressed by the compressor and cooled by the condenser to the evaporator. Another example of intensive heating of the evaporator is to reverse the refrigeration cycle (reverse cycle). Yet another example of intensively heating an evaporator is a sheathed heater arranged so that radiant heat reaches the evaporator.

  The storage device preferably further includes a second electric heater for heating at least part of the vicinity of the suction port of the suction duct, and the cool air supply control function of the control unit turns off the second electric heater. The defrosting control function preferably turns on the second electric heater. Since the fan for blowing is not driven during the defrosting, it is difficult to defrost the inside of the duct with the flowing air. On the other hand, since air does not flow, a place where frost easily forms in the duct does not cause a direct increase in the temperature of the display room even if the temperature is increased by a heater and a rapid defrost is performed. The vicinity of the suction port of the suction duct is a portion that is rapidly cooled when outside air enters, and is one of the places where frost easily forms in the suction duct. Therefore, by installing the second electric heater in that portion, the limited area can be made high temperature and defrosting can be performed efficiently and in a short time.

  It is desirable that the control unit further has a draining control function including stopping the compressor and driving a fan for blowing air. By turning the fan for blowing air and evaporating the water adhering to the portions heated by the defrost control function to remove latent heat, it is possible to rapidly cool them together with draining. At this stage, there is a possibility that warm air is supplied to the display room, but it is shorter than when the cool air supply control is started after waiting for the temperature of the heated part to decrease during defrosting. It is possible to start a service to supply cold air and to maintain the conditions in the display room.

  The evaporator is preferably provided with a plurality of pipe portions, and intermittent fins that are intermittent in the longitudinal direction and the circumferential direction protrude in the radial direction of the respective pipe portions. Such a tube is also called a spine fin type tube, and frost or ice adheres to the tip of the fin and grows. Therefore, unlike a plate fin or a corrugated fin, there is little possibility of clogging between the fins with ice, and the performance is easily maintained. At the same time, when the evaporator is heated suddenly by hot gas, the ice around the tube partially melts and the ice above the fins does not accumulate at the bottom of the fins. It is a possible type of evaporator.

  One form of the display room is an open showcase in which a part thereof is open, and in particular, a flat shape having a U-shaped cross section that opens upward. In this flat type showcase, the supply port of the supply duct and the suction port of the suction duct are arranged at the upper part of the facing wall of the display chamber. In the open showcase, when air curtain is formed, outside air is sucked in, so that frost easily forms on the evaporator and / or the duct, and the possibility of frequent defrosting is high. Therefore, the open showcase can shorten the defrosting time according to the present invention and can extend the cold air supply time, so that the quality of the product can be easily maintained for a long time.

  Another embodiment of the present invention is a storage device control method. The storage device includes a display room for displaying products in a refrigerated and / or frozen state, a supply duct for supplying cold air to the display room, a suction duct for sucking air from the display room, and a suction duct And a connecting duct connecting the supply duct. The connection duct includes at least an evaporator for cooling the sucked air and a fan for blowing air. Further, the storage device has a compressor for supplying the evaporator with the refrigerant cooled by the condenser. And the control method of the other form of this invention has the cool air supply mode including driving the fan and the compressor for ventilation, and the defrost mode including stopping the fan for ventilation.

  The storage device further includes a first electric heater for heating at least a part of the bottom surface of the connection duct. In the cold air supply mode, the first electric heater is turned off, and in the defrost mode, the first electric heater is turned off. It is preferable to turn on the electric heater.

  Further, the storage device further includes a second electric heater for heating at least a part of the suction port of the suction duct and the vicinity thereof, and in the cold air supply mode, the second electric heater is turned off and defrosting is performed. In the mode, it is preferable to turn on the second electric heater.

  Moreover, it is desirable to have a draining mode including stopping the compressor and driving a fan for blowing air.

  FIG. 1 is a sectional view showing a schematic configuration of a storage device according to an embodiment of the present invention. This storage device 1 is an open type frozen showcase suitable for storing and displaying ice cream, frozen foods, etc., and is a flat type (flat rectangular parallelepiped shape) with a floor-standing type and an opening 2 at the top. The center of the housing 10 is a display chamber (storage space) 3 having a substantially U-shaped cross section with the upper part opened. The showcase 1 further includes a duct system 20 that circulates cool air A to the display chamber 3, and the duct system 20 is disposed between the inner wall 5 constituting the display chamber 3 and the housing 10. Yes.

  The duct system 20 connects the supply duct 21 for supplying the cold air A to the display chamber 3, the suction duct 22 for sucking air from the display chamber 3, the suction duct 22 and the supply duct 21, and is sucked. An evaporator 31 for cooling the air and a connection duct 23 incorporating a fan (blower fan) 32 for blowing air. The connection duct 23 extends along the bottom 5b on the opposite side of the bottom 5b of the inner wall 5 constituting the display chamber 3, and the supply duct 21 and the suction duct 22 are the side portions (side walls) 5a and 5c of the inner wall 5. Standing up along. The supply duct 21 and the suction duct 22 are respectively connected to a supply port 25 and a suction port 26 provided at the upper portions of the opposing side walls 5a and 5c, and an air curtain can be formed in the upper opening of the display chamber 3 by the cold air A. It is like that.

  The showcase 1 further includes a heat exhaust portion 40 disposed below the connection duct 23. The exhaust heat unit 40 includes a compressor 41 for compressing the refrigerant supplied to the evaporator 31, a condenser 42 for cooling the compressed refrigerant, and a heat radiation for cooling the condenser 42 by introducing outside air. And a fan 43. The exhaust heat unit 40 is provided with a drain pan 44 for self-evaporating the drain so that the drain can be received from the connection duct 23 through the drain pipe 39.

  The showcase 1 further includes defrosting electric heaters 33 a and 33 b arranged on the bottom surface 23 b of the connection duct 23 and defrosting electric heaters 34 a and 34 b arranged in the vicinity of the suction port 26 of the suction duct 22. And have. The electric heater 33 a is disposed in a region on the lower side of the evaporator 31 in the bottom surface 23 b of the connection duct 23. The electric heater 33b is disposed upstream of the blower fan 32 in the bottom surface 23b of the connection duct 23. Below the evaporator 31 on the bottom surface 23b of the connection duct 23 is an area where frost or ice generated in the evaporator 31 is likely to accumulate. Further, the vicinity of the suction port 26 of the suction duct 22 is an area where moisture contained in the sucked air is frozen and easily becomes frost and / or ice. In particular, in an open type showcase (open showcase) in which a part of the display chamber 3 is an opening 2, when forming an air curtain in the opening 2, not only the cold air A but also the outside air is sucked in. The contained moisture becomes frost or ice and adheres to or accumulates on the evaporator 31 and the like. The adhering frost or ice hinders heat transfer, and a pressure loss is generated to reduce the opening area in the duct, thereby reducing the ability to supply the cold air A to the display chamber 3. Therefore, it is necessary to perform a defrosting operation for removing frost and / or ice when a predetermined condition such as a decrease in air volume is reached and / or periodically.

  FIG. 2 shows the refrigerant cycle and control configuration of the showcase 1. The showcase 1 has a refrigerant cycle 45 including a compressor 41, a condenser 42, and an evaporator 31. The refrigerant cycle 45 further includes an expansion valve 46 for expanding the refrigerant compressed by the compressor 41 and cooled by the condenser 42 and supplying the refrigerant to the evaporator 31, and before being compressed by the compressor 41 and cooled by the condenser 42. And a hot gas bypass valve 35 for guiding the refrigerant (hot gas) to the evaporator 31. The hot gas bypass valve 35 is opened when the evaporator 31 is defrosted, and is closed in a normal service state in which cold air is supplied.

  The showcase 1 further includes a control unit 50 having a function of controlling the blower fan 32, the compressor 41, the exhaust heat fan 43, the hot gas bypass valve 35, and the electric heaters 33a, 33b, 34a, and 34b. . The control unit 50 controls the cold air supply control function 51 for controlling each device in the cold air supply mode, the defrost control function 52 for controlling each device in the defrost mode, and controls each device in the draining mode. The water draining control function 53 is included. In the cool air supply mode, the cool air supply control function 51 turns on the blower fan 32, the exhaust heat fan 43 and the compressor 41 as shown in FIG. 2, and the hot gas bypass valve 35 is closed. The electric heaters 33a, 33b, 34a and 34b are turned off. Therefore, the air sucked from the suction port 26 by the suction force of the blower fan 32 is guided to the connection duct 23 via the suction duct 22 and cooled by the evaporator 31. Then, the cooled air (cold air) A is supplied from the supply port 25 to the display chamber 3 through the supply duct 21 to cool the display chamber 3 and form an air curtain in the opening 2. During this time, frost or ice adheres and accumulates in the vicinity of the suction port 26 of the suction duct 22, the bottom surface 23 b of the connection duct 23, and the evaporator 31.

  In the defrost mode, the fan 32 for blowing is stopped by the defrost control function 52, the fan 43 for exhaust heat and the compressor 41 are driven, the hot gas bypass valve 35 is opened, and the evaporator 31 is heated. The Furthermore, when the electric heaters 33a, 33b, 34a and 34b are turned on (energized), places where frost formation or icing is likely to occur such as the bottom surface 23b of the connection duct 23 and the suction port 26 of the suction duct 22 are heated. The The frost or ice adhering to and / or depositing on the evaporator 31 is melted and drained. These drains pass through the bottom surface 23 b of the connection duct 23 and are collected in the drain pan 44 through the drain pipe 39. Further, frost or ice adhering to and / or depositing on the suction duct 22 and the connection duct 23 is melted and drained. At this time, since the blower fan 32 is stopped, the air flow (forced flow) inside the duct system 20 including the suction duct 22, the connection duct 23, and the supply duct 21, as shown in FIG. The display chamber 3 is not supplied with cold air or hot air from the duct system 20.

  In the draining mode, the draining control function 53 stops the compressor 41, closes the hot gas bypass valve 35, turns off the electric heaters 33a, 33b, 34a and 34b, and drives the fan 32 for blowing air. Accordingly, air flows inside the duct system 20 including the suction duct 22, the connection duct 23, and the supply duct 21. Drain remaining in the bottom surface 23 b of the connection duct 23, the vicinity of the suction port 26 of the suction duct 22, the evaporator 31, and the like is collected or evaporated through the drain pipe 39 by the air flow. In addition, due to the latent heat of evaporation of the drain, the portion where the drain is generated by heating, that is, the bottom surface 23b of the connection duct 23, the vicinity of the suction port 26 of the suction duct 22, and the evaporator 31 are cooled.

  After the operation in the draining mode is continued for a predetermined time, the operation proceeds to the cold air supply mode. The cool air supply control function 51 supplies the cool air A from the duct system 20 to the display chamber 3 and cools the display chamber 3. In the defrosting mode in which a part of the duct system 20 and the evaporator 31 are heated, air is not supplied from the duct system 20 to the display chamber 3. Therefore, the influence on the display chamber 3 by heating a part of the duct system 20 and the evaporator 31 can be suppressed.

  In the draining mode, the air whose temperature is not actively controlled by the evaporator 31 is supplied to the display chamber 3. Since part of the duct system 20 and the evaporator 31 are heated, air having a high temperature may be supplied to the display chamber 3 in the draining mode, particularly in the initial stage of the draining mode. However, the time for the draining mode is very short for the cold air supply mode. For example, the time for the defrosting mode is about 15 minutes and the time for the water draining mode is 2 minutes for the cold air supply mode of 8 hours. Expected to be about. Therefore, in this showcase 1, with respect to the cold air supply for 8 hours, air (wind) is not supplied to the display chamber 3 at the time of defrosting, and the defrosting is completed for about 2 minutes after draining. Air (wind) that has passed through the system 20 is supplied to the display chamber 3.

  FIG. 4A shows the on / off state of each device described above. FIG. 4B shows how the cold air supply mode 55, the defrosting mode 56, and the draining mode 57 transition in the control method of the showcase 1. When the showcase 1 is started, first, the cold air supply mode 55 is set. In this mode, the cool air supply control function 51 turns on the compressor 41 and the blower fan 32. Therefore, the refrigerant cycle 45 moves and the cold air cooled by the evaporator 31 is supplied from the duct system 20 to the display chamber 3.

  When a predetermined service time T1, for example, 8 hours elapses, the defrosting mode 56 is entered. The timing for shifting to the defrosting mode 56 may be managed by the service time T1, or may be managed by factors such as a decrease in the amount of cold air supplied from the supply duct 21. In the defrost mode 56, the blower fan 32 is stopped by the defrost control function 52, the hot gas bypass valve 35 is opened, and the heaters 33a, 33b, 34a and 34b are turned on. Therefore, due to the heat of the hot gas and the heaters 33a, 33b, 34a and 34b, portions where frost or ice adheres, or portions where frost or the like easily adheres, that is, the evaporator 31 or a predetermined portion of the duct generate heat and temperature. Rises and melts frost or ice adhering to those parts.

  In the defrost mode 56, the blower fan 32 is stopped by the defrost control function 52 of the control unit 50. By forcibly stopping the blower fan 32 that supplies air (wind) from the duct system 20 to the display chamber 3, even if the temperature is suddenly increased inside the connection duct 23 during defrosting, the display chamber 3 is returned to. Hot air is not supplied. For this reason, the evaporator 31 can be rapidly heated by hot gas, and the portion of the connection duct 23 where frost easily adheres and / or accumulates can be rapidly heated by the electric heaters 33a and 33b. Accordingly, the portion where frost and / or ice is attached or deposited can be concentrated and heated to rapidly melt the frost and / or ice. For this reason, time (defrosting time) T2 of a defrosting operation can be shortened.

  When defrosting time T2, for example, 15 minutes elapses, the process proceeds to draining mode 57. In the draining mode 57, the blower fan 32 is turned on by the draining control function 53, the compressor 41 is turned off, and the hot gas bypass valve 35 and the heaters 33a, 33b, 34a and 34b are also turned off. Therefore, since the refrigerant cycle 45 does not operate, it is not cooled and the heaters 33a, 33b, 34a and 34b do not generate heat. In this state, only air circulates through the duct system 20 and drains water.

  When the draining time T3, for example, 2 minutes elapses, the process proceeds to the cold air supply mode 55. Therefore, the refrigerant cycle 45 again moves, and the cold air cooled by the evaporator 31 is supplied from the duct system 20 to the display chamber 3.

  FIG. 5 shows an enlarged configuration of the vicinity of the suction port 26 of the suction duct 22. In the vicinity of the suction port 26, there is a region where the cold air A forming the air curtain is sucked together with the outside air, and the temperature of the outside air rapidly decreases due to the cold air A. Therefore, the vicinity of the suction port 26, particularly the inside of the suction duct 22, is a portion where the moisture of the outside air is initially condensed and frost is likely to be formed. When the humidity of outside air is high, frost tends to adhere. In the conventional defrosting operation, the fan is driven to circulate air in the duct system. Therefore, since air or outside air heated for defrosting in the duct is sucked from the suction port 26, the vicinity of the suction port 26 is one of the portions where the temperature easily rises during defrosting, such as a heater. It can be defrosted well without providing.

  In the showcase 1, since the blower fan 32 is stopped in the defrost mode 56, outside air or heated air is not sucked from the suction port 26. For this reason, the vicinity of the suction port 26 of the suction duct 22 is bent into an L shape, and an electric heater 34 b is installed on the back surface of the panel 28 a immediately below the suction port 26. Further, a flat region (horizontal portion) 29 is generated below the suction port 26, and an electric heater 34 a is installed in the flat region 29.

  This flat region 29 is easy to accumulate frost and easily remove the accumulated frost. That is, in this example, a shape in which frost easily accumulates is provided in a specific place of the suction duct 22, and a heater 34 a is installed there, and concentrated heating is performed by the heater 34 a, thereby facilitating removal of frost during defrosting. ing. At the same time, the vicinity of the suction port 26 immediately above the flat region 29 is also warmed by the heater 34b. Therefore, the frost adhering to the vicinity of the suction port 26 can also be removed, and the drain that melted the frost is dropped into the flat region 29 heated by the heater 34a. Can be removed.

  Further, the panel below the suction port 26 has a panel 28a immediately below the suction port 26 disposed inside the duct 22 with respect to the lower panel 28b. Even when frost is formed on the outer surface of the panel 28a immediately below the suction port 26, the drained frost is dripped into the suction duct 22 during the defrosting. Therefore, it is possible to prevent the product stored in the display chamber 3 from getting wet with drainage.

  FIG. 6 is an enlarged cross-sectional view of a part of the evaporator 31. The evaporator 31 is a spine fin type heat exchanger in which a tube (spine fin tube) 69 including a spine fin 64 is bent in a direction crossing the connection duct 23 to form a plurality of pipe portions 66. Therefore, from each tube main body 62, the spine fin 64 of the shape interrupted in the longitudinal direction and the circumferential direction protrudes in the radial direction. The spine fin tube 69 can be manufactured by cutting a plate material into a strip shape, and winding a band-like member obtained by bending the plate material into a bowl shape around the tube body 62 as a fin 64 and joining them.

  The distance between the spine fins 64 is narrow at the root (the tube body 62 side) and wide at the tip. Therefore, in the evaporator 31 that employs the spine fin tube 69, even if frosting or icing progresses, the tip of the fin 64 is widened so that it is difficult to block, and a decrease in the air volume of the cold air A can be prevented. Furthermore, since the tips of the fins 64 are spread when heated rapidly by hot gas, frost or ice that has melted away from the tube main body 62 is easily separated from the fins 64. Therefore, frost or ice that has melted away from the tube, such as plate fins or corrugated fins, is sandwiched between the fins, and it is rarely difficult to improve the air volume. For this reason, it can heat rapidly by flowing hot gas to the evaporator 31, and can defrost in a short time. Further, even if the temperature of the evaporator 31 is increased, since the blower fan 32 is stopped, the heated air does not flow into the display chamber 3, and the frozen food in the display chamber 3 melts or the ice cream softens. Can be prevented.

  Thus, in the showcase 1, when defrosting, circulating hot air to the duct system does not remove frost or ice adhering or accumulating in the duct system, but stops air circulation. Frost and ice are removed by partially heating areas where frost and ice are likely to adhere or accumulate. Therefore, it is possible to prevent heat during the defrosting from reaching the display room 3, and to prevent the temperature of the display room 3 from rapidly rising during the defrosting to prevent the quality of the refrigerated product such as frozen food from deteriorating. it can. In this showcase 1, in order to stop the circulation of air during defrosting, for example, a heater is disposed in a region or place where frost formation or icing is likely to occur, such as in the vicinity of the suction port 26 of the suction duct 22. And need to be defrosted. In areas where frost formation or icing is likely to occur, a location or shape where frost formation or icing is likely to occur is provided in order to increase the defrosting effect of the heater, and the heater is installed in such a location. Installation is also effective.

  In the showcase 1 described above, the heater is disposed along the outer side or the inner side of the portion where frosting of the duct is considered to be a problem. Any heater may be used as long as it can heat those portions. For example, a sheathed heater arranged in a duct so that radiant heat is supplied to those portions may be used. In the showcase 1 described above, hot gas supplied via a bypass valve is used to heat the evaporator, but the refrigeration cycle may be reversed (reverse cycle). Furthermore, a sheathed heater may be arranged so as to heat the evaporator.

  After the defrosting, the air fan 32 may not be driven for an appropriate time, and the refrigerant cycle 45 may not be moved, and the state may be left and the drain may be drained (drained) naturally. Since the display chamber 3 is not affected by the heat after defrosting, it is preferable in that respect. However, since time elapses before shifting to cold air supply, the supply of cold air may be delayed. As described above, the drainage mode 57 may be provided to drive the blower fan 32 to circulate the air inside the duct system 20, promoting draining and promoting drain evaporation, and re-solidifying drain. In addition, by removing the heat of evaporation (latent heat), the portion heated for defrosting can be rapidly cooled. Therefore, after defrosting, the time to shift to cold air supply can be shortened.

  In the above description, the present invention has been described by taking a flat open showcase as an example. However, the present invention is not limited to a flat type, and may be an open showcase whose front or back is open. Furthermore, by applying the present invention to a closed type or semi-closed type display case having a display room (storage room, storage room) that can be opened and closed by a door, the defrosting time can be shortened. It is possible to prevent quality deterioration of products stored in the room.

Sectional drawing which shows schematic structure of a flat type showcase. It is a figure which shows the refrigerant cycle and system configuration | structure of the showcase shown in FIG. 1, and is a figure for demonstrating the state (cold air supply mode) of cold air supply. It is a figure which shows the refrigerant cycle and system configuration | structure of the showcase shown in FIG. 1, and is a figure for demonstrating the state (defrost mode) of a defrost. FIG. 4A shows the on / off status of the device in each mode, and FIG. 4B shows the transition to each mode. Sectional drawing which expands and shows the structure of the vicinity of the suction opening of a suction duct. Sectional drawing which expands and shows the structure of an evaporator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Showcase, 3 Display room (storage area), 5 Inner wall of display room 10 Housing 20 Duct system, 21 Supply duct, 22 Suction duct, 23 Connection duct 25 Supply port, 26 Suction port 31 Evaporator, 32 Fan for ventilation ( Blower fan)
33a, 33b, 34a, 34b Heater (electric heater)
35 Hot gas bypass valve 41 Compressor, 42 Condenser 50 Control unit

Claims (10)

A display room for displaying goods in a refrigerated and / or frozen state;
A supply duct for supplying cold air to the display room;
A suction duct for sucking air from the display room;
A connection duct having at least a built-in evaporator and a blower fan for connecting the suction duct and the supply duct and cooling the sucked air;
A compressor for compressing the refrigerant and supplying the evaporator with the refrigerant cooled by the condenser;
A control unit including repeatedly controlling a cool air supply mode for supplying cool air to the display room and a defrost mode for defrosting the evaporator;
The control unit includes a cool air supply control function including driving the fan for blowing and the compressor, and a defrost control function including stopping the fan for blowing. The first electric heater according to claim 1, further comprising a first electric heater for heating at least a part of a bottom surface of the connection duct,
The storage device in which the cold air supply control function of the control unit turns off the first electric heater, and the defrost control function turns on the first electric heater. The second electric heater according to claim 2, further comprising a second electric heater for heating at least part of the vicinity of the suction port of the suction duct,
The storage device in which the cold air supply control function of the control unit turns off the second electric heater, and the defrost control function turns on the second electric heater.   The storage device according to claim 1, wherein the control unit further includes a draining control function including stopping the compressor and driving the fan for blowing air.   In any one of Claims 1 thru | or 4, The said evaporator is provided with the several pipe part, The intermittent type fin of the shape interrupted in the longitudinal direction and the circumferential direction protrudes in the radial direction of each pipe part, Storage device.   6. The storage device according to claim 1, wherein the display chamber is a flat shape having a U-shaped cross section that opens upward. A storage device control method having a display room for displaying goods in a refrigerated and / or frozen state, wherein the storage device further comprises:
A supply duct for supplying cold air to the display room;
A suction duct for sucking air from the display room;
A connection duct having at least a built-in evaporator and a blower fan for connecting the suction duct and the supply duct and cooling the sucked air;
A compressor for compressing the refrigerant and supplying the refrigerant cooled by the condenser to the evaporator;
The control method is
A cold air supply mode including driving the fan for blowing and the compressor;
And a defrosting mode including stopping the fan for blowing air. 8. The storage device according to claim 7, further comprising a first electric heater for heating at least a part of a bottom surface of the connection duct.
The control method of turning off the first electric heater in the cold air supply mode and turning on the first electric heater in the defrosting mode. In Claim 7, the storage device further includes a second electric heater for heating at least a part of the suction port of the suction duct and the vicinity thereof,
The control method of turning off the second electric heater in the cold air supply mode and turning on the second electric heater in the defrosting mode.   8. The control method according to claim 7, further comprising a draining mode including stopping the compressor and driving the fan for blowing air.

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