JP2006275467A - Showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a showcase for preserving articles stored in an article storage box at a proper temperature by performing cooling operation corresponding to cooling load and efficient defrosting operation. <P>SOLUTION: The showcase comprises a first air duct 15 provided with a first evaporator 15c and a first evaporator blower 15d for forming air curtain in an opening portion of a showcase body 10, and a second air duct 16 provided with a second evaporator 16c and a second evaporator blower 16d for forming air curtain in the opening portion of the showcase body 10. Thus, the distributing direction and air quantity of the air curtain to be formed in the opening portion of the showcase body 10 are changed over, and so the articles stored in the article storage box 13 can be always preserved at a proper temperature by performing cooling operation corresponding to cooling load and efficient defrosting operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerated / frozen showcase in which an air curtain is formed in an opening of a showcase body.

Conventionally, this type of showcase is formed between a showcase body having an opening for putting in and out products, a product storage provided in the showcase body, and between the showcase body and the product storage section. A pair of coolers and a pair of blowers are provided inside, and an air passage can be formed in the opening of the showcase body is known (for example, see Patent Document 1).
JP-A-60-194270

  However, in the conventional showcase, of the pair of coolers arranged in the ventilation path, one of the coolers is defrosted by the high-temperature refrigerant discharged from the compressor, and the other cooler performs the cooling operation. Since the air flowing through the ventilation path is heated by the heat of the refrigerant when defrosting, the cooling capacity is lowered or the necessary refrigeration capacity is obtained when the cooling load is large. There is a problem that the temperature of the product in the product storage rises.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to carry out the cooling operation according to the cooling load and the efficient defrosting operation so that the products stored in the product storage are stored. The object is to provide a showcase that can be stored at an appropriate temperature.

  In order to achieve the above object, the present invention provides a showcase including a showcase body having an opening for putting in and out a product, and a product storage provided in the showcase body, and an inner surface of the showcase body, A first ventilation path formed between the product storage and capable of forming an air curtain in the opening of the showcase body, and a first cooler and a first blower provided in the first ventilation path And a second ventilation path formed between the first ventilation path and the product storage and capable of forming an air curtain at the opening of the showcase body, and a second ventilation path provided in the second ventilation path. The cooler and the second blower are provided.

  Thereby, since the 1st and 2nd ventilation path which can form an air curtain in the opening part of a showcase main body is provided, the distribution direction and air volume of the air curtain formed in the opening part of a showcase main body are Switchable.

  According to the present invention, since the flow direction and the air volume of the air curtain formed in the opening of the showcase body can be switched, a cooling operation according to the cooling load and an efficient defrosting operation can be performed. Products stored in the product storage can always be stored at an appropriate temperature.

  1 to 10 show a first embodiment of the present invention. FIG. 1 is an overall perspective view of the showcase, FIG. 2 is a side sectional view of the showcase, and FIG. 3 is a refrigerant circuit diagram of the showcase. 4 is a block diagram showing the control system, FIG. 5 is a side sectional view of the showcase showing the flow of air flowing through the first ventilation path, and FIG. 6 is a showcase showing the flow of air flowing through the second ventilation path. FIG. 7 is a flowchart relating to switching control of the air curtain flow direction in the cooling operation, FIG. 8 is a flowchart relating to temperature control in the cooling operation, and FIG. 9 is a side sectional view of the showcase showing the air flow in the rapid cooling operation. FIG. 10 and FIG. 10 are side sectional views of the showcase showing the air flow in the defrosting operation.

  The showcase shown in FIG. 1 includes a showcase body 10 having an open top surface, a refrigerant circuit 20 configured in the showcase body 10, and a control unit 30 that controls the cooling operation and the defrosting operation. .

  As shown in FIG. 2, the showcase body 10 is covered with a heat insulating wall 11 on the front side, the bottom side, the back side, and the left and right sides, and partitions the interior along the front side, the bottom side, and the back side. Is divided into a ventilation path 12 and a product storage 13. A machine room 14 is formed in the lower part of the showcase body 10, and refrigeration equipment such as a compressor 14a, a condenser 14b, and a condenser blower 14c is installed therein.

  The ventilation path 12 is composed of a first ventilation path 15 and a second ventilation path 16 by partitioning the interior thereof into a heat insulating wall 11 side and a product storage case 13 side. A first air suction port 15a is provided at the upper end of the first ventilation path 15 located on the front side of the showcase body 10 toward the rear side, and the upper end of the first ventilation path 15 located on the rear side. On the side, a first air discharge port 15b is provided toward the front side. In addition, a second air discharge port 16a is provided on the upper end side of the second ventilation path 16 located below the first air intake port 15a toward the back side, and the first air discharge port 15b A second air inlet 16b is provided on the upper end side of the second ventilation path 16 located below toward the front side. The first air discharge port 15b and the second air discharge port 16a are provided with rectifying members 17a and 17b for forming an air curtain, respectively, and the first air discharge port 15b and the first air intake port 15a An air curtain can be formed between the second air discharge port 16a and the second air suction port 16b. A first evaporator 15c as a first cooler is provided in the first ventilation path 15, and a first air blower 15c as a first blower is provided on the first air inlet 15a side of the first evaporator 15c. One evaporator blower 15d is provided. A second evaporator 16c as a second cooler is provided in the second ventilation path 16, and a second blower is provided on the second air inlet 16b side of the second evaporator 16c. The second evaporator blower 16d is provided. The second evaporator blower 16d used here is provided so that the rotation direction can be rotated forward and backward, and the air in the second ventilation path 16 is circulated toward the second air discharge port 16a by rotating forward. In addition, it is possible to circulate also toward the second air suction port 16b side by rotating in the reverse direction. A first defrost heater 15e as a first heater is provided between the first evaporator 15c and the first evaporator blower 15d, and between the second evaporator 16c and the second evaporator blower 16d. Is provided with a second defrost heater 16e as a second heater. By energizing the first and second defrost heaters 15e and 16e, respectively, the air heated by the first and second defrost heaters 15e and 16e adheres to the first evaporator 15c and the second evaporator 16c. The frost is melted with heat.

  As shown in FIG. 3, the refrigerant circuit 20 includes a compressor 14a, a condenser 14b, a first evaporator 15c, a second evaporator 16c, and an expansion valve 21, which are connected by a refrigerant distribution pipe. ing. That is, the inflow side of the condenser 14b is connected to the discharge side of the compressor 14a, and the inflow side of the first evaporator 15c is connected to the outflow side of the condenser 14b. At this time, an expansion valve 21 is provided on the discharge side of the condenser 14b. The refrigerant circuit 20 is connected to the suction side of the second evaporator 16c on the outflow side of the first evaporator 15c, and to the suction side of the compressor 14a on the outflow side of the second evaporator 16c. Is configured.

  The control unit 30 is configured by a microcomputer, and a program related to control operations of the cooling operation, the rapid cooling operation, and the defrosting operation is stored in the memory. Further, as shown in FIG. 4, the control unit 30 detects the temperatures of the compressor 14 a, the first evaporator blower 15 d, the second evaporator blower 16 d, and the front side upper part inside the product storage 13. A first temperature detector 31 and a second temperature detector 32 for detecting the temperature of the upper part on the back side in the commodity storage 13 are connected. The first temperature detector 31 and the second temperature detector 32 detect the temperature of the air in the vicinity of the first air inlet 15a and the second air inlet 16b, respectively. A first temperature detector 31 is arranged on the first air inlet 15a side in the first ventilation path 15, and a second temperature detection is arranged on the second air inlet 16b side in the second ventilation path 16. A container 32 may be arranged.

  In the showcase configured as described above, when the compressor 14a, the condenser blower 14c, and the first evaporator blower 15d are operated in a state where the second evaporator blower 16d is stopped, the compressor 14a is discharged. After the refrigerant flows into the condenser 14b, the refrigerant sequentially flows into the first evaporator 15c and the second evaporator 16c through the expansion valve 21, and is sucked into the compressor 14a. At this time, since the second evaporator blower 16d is stopped, the refrigerant and the air in the second ventilation path are not subjected to heat exchange in the second evaporator 16c. Further, the air flowing into the first ventilation path 15 from the first air inlet 15a by the first evaporator blower 15d is cooled by the first evaporator 15c as shown in FIG. The air is discharged from the air discharge port 15b toward the first air suction port 15a. Thereby, an air curtain is formed in the opening of the showcase body 10 from the back side to the front side. However, since the high-temperature air outside the product storage 13 flows into the first ventilation path 15 from the first air intake port 15a together with the air in the product storage 13, the first air is continued when this operation is continued. The temperature of the upper part on the front side in the product storage 13 in which the suction port 15a is located increases.

  Further, when the compressor 14a, the condenser blower 14c, and the second evaporator blower 16d are operated in a state where the first evaporator blower 15d is stopped, the refrigerant discharged from the compressor 14a flows into the condenser 14b. Thereafter, the refrigerant sequentially flows into the first evaporator 15c and the second evaporator 16c through the expansion valve 21, and is sucked into the compressor 14a. At this time, since the first evaporator blower 15d is stopped, heat is not exchanged between the refrigerant and the air in the first ventilation path 15 in the first evaporator 15c. Further, the air flowing into the second ventilation path 16 from the second air suction port 16b by the second evaporator blower 16d is cooled by the second evaporator 16c as shown in FIG. The air is discharged from the air discharge port 16a toward the second air suction port 16b. Thereby, an air curtain is formed from the front side of the opening of the showcase body 10 toward the back side. However, since the high-temperature air outside the product storage 13 flows into the second ventilation path 16 from the second air intake port 16b together with the air in the product storage 13, the second air is maintained when this operation is continued. The temperature of the upper part on the back side in the product storage 13 where the suction port 16b is located increases.

  Therefore, in the cooling operation, the control unit 30 performs the following switching control of the air curtain flow direction. First, the first evaporator blower 15d is operated to stop the second evaporator blower 16d (step S1 in FIG. 7), and the first evaporator blower 15d is operated to turn on the second evaporator blower 16d. When a predetermined time has elapsed since the stop (step S2 in FIG. 7), the first evaporator blower 15d is stopped and the second evaporator blower 16d is operated (step S3 in FIG. 7). When a predetermined time elapses after the first evaporator blower 15d is stopped and the second evaporator blower 16d is operated (step S4 in FIG. 7), the first evaporator blower 15d is operated again to perform the second operation. The evaporator blower 16d is stopped (step S1 in FIG. 7). By repeating such an operation, the flow direction of the air curtain formed in the opening of the showcase body 10 is switched every predetermined time, and the first air suction that causes the highest temperature in the product storage 13 It is possible to prevent a temperature rise in the vicinity of the port 15a and in the vicinity of the second air suction port 16b.

  In the cooling operation, the control unit 30 performs the following temperature control. First, the compressor 14a is operated (step S11 in FIG. 8). Next, the detected temperature T1 of the first temperature detector 31 detects a temperature that is equal to or lower than a predetermined first set temperature TL (step S12 in FIG. 8), and the detected temperature T2 of the second temperature detector 32 is predetermined. Is detected (step S13 in FIG. 8), the operation of the compressor 14a is stopped (step S14 in FIG. 8). Further, when one or both of the detected temperature T1 of the first temperature detector 31 and the detected temperature T2 of the second temperature detector 32 detect a temperature equal to or higher than a predetermined second set temperature TH (TH> TL) ( 8 (steps S15 and S16), the compressor 14a is operated (step S11 in FIG. 8).

  By repeatedly performing such an operation, it is possible to maintain the temperature in the vicinity of the first air inlet 15a and the vicinity of the second air inlet 16b in the commodity storage 13 within a predetermined set temperature range. Become.

  Next, when the cooling load is large, such as immediately after turning on the power or during the daytime in summer, the inside of the product storage 13 is cooled by a rapid cooling operation. First, when the compressor 14a, the condenser blower 14c, and the first evaporator blower 16a are operated, and the second evaporator blower 16b is operated in the reverse rotation direction, as shown in FIG. The air flowing into the first ventilation path 15 from the first air suction port 15a by the blower 15d is cooled by the first evaporator 15c and travels from the first air discharge port 15b to the first air suction port 15a. Discharged. Thereby, an air curtain is formed in the opening of the showcase body 10 from the back side to the front side. Further, the air flowing into the second ventilation path 16 from the second air discharge port 16a by the second evaporator blower 16d is cooled by the second evaporator 16c, and is then supplied from the second air suction port 16b to the second. The air is discharged toward the air discharge port 16a. As a result, an air curtain that circulates from the back side to the front side of the opening of the showcase body 10 is further formed below the air curtain formed by the air that circulates through the first ventilation path 15. Thus, the inside of the product storage 13 can be rapidly cooled. At this time, the rectifying member is not provided in the second air suction port 16b for discharging the air in the second ventilation path 16, but is covered by an air curtain formed by the air flowing through the first ventilation path 15. Therefore, the air curtain formed by the air flowing through the second ventilation path 15 is not disturbed.

  Next, in order to remove frost adhering to the first evaporator 15c and the second evaporator 16c, a defrosting operation is performed as follows. First, the operation of the compressor 14a is stopped, the first evaporator blower 15d and the second evaporator blower 16d are operated, and the first defrost heater 15e, the second defroster and the heater 16e are energized. At this time, the second evaporator blower 16d operates in the forward rotation direction. By operating the first evaporator blower 15d and the second evaporator blower 16d at the same time, no air curtain is formed in the opening of the showcase body 10, and as shown in FIG. The air discharged from the air discharge port 15b flows into the second ventilation path 16 from the second air suction port 16b, and the air discharged from the second air discharge port 16a flows from the first air suction port 15a. It flows into the first ventilation path 15. As a result, the first defrost heater 15e and the second defrost heater 16e cause the first evaporator 15c and the second evaporator 16c to be circulated through the first ventilation path 15 and the second ventilation path 16, respectively. It is possible to efficiently remove the attached frost.

  Thus, according to the showcase of the present embodiment, the first evaporator 15c and the first evaporator blower 15d are provided, and the first ventilation that can form an air curtain in the opening of the showcase body 10 is provided. The showcase is provided with the passage 15, the second evaporator 16c and the second evaporator blower 16d, and the second ventilation passage 16 capable of forming an air curtain at the opening of the showcase body 10. The flow direction and air volume of the air curtain formed at the opening of the main body 10 can be switched, and the products stored in the product storage 13 can be switched by performing cooling operation or efficient defrosting operation according to the cooling load. It is possible to always store at an appropriate temperature.

  The air curtain formed by the air flowing through the first ventilation path 15 and the air curtain formed by the air flowing through the second ventilation path 16 are configured to flow in opposite directions, respectively, Since the evaporator blower 15d and the second evaporator blower 16d are operated alternately every predetermined time, the flow direction of the air curtain formed in the opening of the showcase body 10 is switched every predetermined time. The temperature increase in the vicinity of the first air suction port 15a and the second air suction port 16b in the product storage 13 can be prevented, and the air curtain is unidirectional as in a conventional showcase. In addition, it is not necessary to set the evaporation temperature of the refrigerant in the evaporator low with reference to the temperature in the vicinity of the air inlet, and the consumption energy can be increased by setting the evaporation temperature of the refrigerant high. It is possible to achieve a reduction of Energy. In addition, by setting the refrigerant evaporation temperature to be high, the product temperature in the product storage 13 does not become too low, and the quality of the product can be improved.

  The air curtain formed by the air flowing through the first ventilation path 15 and the air curtain formed by the air flowing through the second ventilation path 16 are configured to flow in the same direction, and the first Since the evaporator blower 15d and the second evaporator blower 16d are simultaneously operated, the opening of the showcase body 10 is opened by the air flowing through the first ventilation path 15 and the air flowing through the second ventilation path 16. A double air curtain can be formed in the part, and the product in the product storage 13 can be cooled by a high cooling capacity.

  The air curtain formed by the air flowing through the first ventilation path 15 and the air curtain formed by the air flowing through the second ventilation path 16 are configured to flow in opposite directions, respectively, The evaporator blower 15d and the second evaporator blower 16d are operated at the same time, and the first evaporator 15c and the second evaporator 15c are defrosted by the first defrost heater 15e and the second defrost heater 16e, respectively. Therefore, the air discharged from the first air discharge port 15b flows into the second ventilation path 16 from the second air intake port 16b, and the air discharged from the second air discharge port 16a is By circulating air in the first ventilation path 15 and the second ventilation path 16 so as to flow into the first ventilation path 15 from the first air inlet 15a, the first evaporation 15c and a second evaporator 16c can be simultaneously defrosting, it is possible to reduce the rise in temperature in the commodity storage chamber 13 by performing a defrosting operation in a short time.

  Further, when the detected temperature T1 of the first temperature detector 31 and the detected temperature T2 of the second temperature detector 32 are both equal to or lower than a predetermined first set temperature TL while the compressor 14a is operated, the compressor 14a is stopped, and when the detected temperature of one of the detected temperature T1 and the detected temperature T2 becomes higher than a predetermined second set temperature TH, the compressor 14a is operated. Can be held within a predetermined temperature range, and the temperature of the product stored in the product storage 13 can be maintained at an appropriate temperature.

  11 to 13 show a second embodiment of the present invention. FIG. 11 is a refrigerant circuit diagram of a showcase, FIG. 12 is a block diagram showing a control system, and FIG. 13 is a flow direction of an air curtain in cooling operation. It is a flowchart regarding the switching control. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said 1st Embodiment.

  The showcase of this embodiment includes a refrigerant circuit 40 in which a first evaporator 15c and a second evaporator 16c are connected in parallel.

  As shown in FIG. 11, the refrigerant circuit 40 includes a compressor 14a, a condenser 14b, a first evaporator 15c, a second evaporator 16c, an expansion valve 41, a first electromagnetic valve 42a, and a second electromagnetic valve. 42b, and these are connected by piping for refrigerant distribution. That is, the inflow side of the condenser 14b is connected to the discharge side of the compressor 14a, and the inflow side of the first evaporator 15c and the inflow side of the second evaporator 16c are connected in parallel to the outflow side of the condenser 14b. Has been. At this time, an expansion valve 41 is provided on the outflow side of the condenser 14b, a first electromagnetic valve 42a is provided between the expansion valve 41 and the first evaporator 15c, and the expansion valve 41 and the second A second electromagnetic valve 42b is provided between the evaporators 16c. The refrigerant circuit 40 is configured by connecting the suction side of the compressor 14a to the outflow side of the first evaporator 15c and the outflow side of the second evaporator 16c, respectively.

  12, the controller 30 detects the temperatures of the compressor 14a, the first evaporator blower 15d, the second evaporator blower 16d, and the upper temperature on the front side in the product storage 13. 1 temperature detector 31, a second temperature detector 32 for detecting the temperature of the upper part on the back side in the product storage 13, a first electromagnetic valve 42 a, and a second electromagnetic valve 42 b are connected.

  Further, the first and second defrost heaters 15e and 16e of the present embodiment are incorporated in the first and second evaporators 15c and 16c, respectively, and the first and second evaporators are directly applied by energization. 15c and 16c are heated.

  In the showcase configured as described above, in the cooling operation, the control unit 30 performs the following switching control of the air curtain flow direction. First, the first evaporator blower 15d is operated to stop the second evaporator blower 16d (step S21 in FIG. 13), the first electromagnetic valve 42a is opened, and the second electromagnetic valve 42b is closed. (Step S22 in FIG. 13). When a predetermined time elapses after the first electromagnetic valve 42a is opened and the second electromagnetic valve 42b is closed (step S23 in FIG. 13), the first evaporator blower 15d is stopped to turn on the second evaporator. The blower 16d is operated (step S24 in FIG. 13), the first electromagnetic valve 42a is closed, and the second electromagnetic valve 42b is opened (step S25 in FIG. 13). When a predetermined time elapses after the first electromagnetic valve 42a is closed and the second electromagnetic valve 42b is opened (step S26 in FIG. 13), the first evaporator blower 15d is operated again to perform the second evaporation. The machine blower 16d is stopped (step S21 in FIG. 13), the first electromagnetic valve 42a is opened, and the second electromagnetic valve 42b is closed (step S22 in FIG. 13). By repeating such an operation, the flow direction of the air curtain formed in the opening of the showcase body 10 is switched every predetermined time, and the vicinity of the first air inlet 15a in the product storage 13 and the first It is possible to prevent a temperature rise in the vicinity of the second air inlet 16b. Further, when the first evaporator blower 15d is stopped, the flow of the refrigerant to the first evaporator 15c is restricted by the first electromagnetic valve 42a, and the second evaporator blower 16d is stopped. Sometimes, the flow of the refrigerant to the second evaporator 16c is restricted by the second electromagnetic valve 42a.

  In the cooling operation, the control unit 30 performs temperature control similar to that in the first embodiment.

  Next, in order to remove frost adhering to the first evaporator 15c and the second evaporator 16c, a defrosting operation is performed as follows. In the case of defrosting the first evaporator 15c, the first electromagnetic valve 42a is closed and the second electromagnetic valve 42b is opened, the first evaporator blower 15d is stopped, and the second evaporator is used. The blower 16d is operated, and the first defrost heater 15e is energized. The first evaporator 15c is heated by the first defrost heater 15e, and an air curtain is formed in the opening of the showcase body 10 to cool the inside of the product storage case 13. Further, when defrosting the second evaporator 16c, the first electromagnetic valve 42a is opened and the second electromagnetic valve 42b is closed, and the first evaporator blower 15d is operated to operate the second evaporator 16c. The evaporator blower 16d is stopped, and the second defrost heater 16e is energized. The second evaporator 16c is heated by the second defrost heater 16e, and an air curtain is formed at the opening of the showcase body 10 to cool the inside of the product storage case 13. Thereby, it becomes possible to cool the inside of the product storage 13 at the same time as defrosting of the first evaporator 15c or the second evaporator 16c.

  Thus, according to the showcase of the present embodiment, when the first evaporator blower 15d is operated and the second evaporator blower 16d is stopped, the first electromagnetic valve 42a is opened and the second electromagnetic blower 16d is opened. When the valve 42b is closed, the first evaporator blower 15d is stopped and the second evaporator blower 16d is operated, the first electromagnetic valve 42a is closed and the second electromagnetic valve 42b is opened. Therefore, the refrigerant can be circulated only to the evaporator in the ventilation path through which the air circulates, and the amount of refrigerant charged in the refrigerant circuit 20 can be reduced.

  Further, when the first defrost heater 15e is operated, the first evaporator blower 15d is stopped and the second evaporator blower 16d is operated, and when the second defrost heater 16e is operated, the first evaporator blower is operated. Since the second evaporator blower 16d is stopped by operating 15d, the inside of the product storage 13 is cooled by the air flowing through the second ventilation path 16 at the same time as the first evaporator 15c is defrosted. In addition, the inside of the product storage 13 can be cooled by the air flowing through the first ventilation path 15 at the same time that the second evaporator 16c is defrosted, and at the same time as the defrosting operation is performed, the product storage 13 By continuing the cooling inside, it is possible to prevent the temperature of the product in the product storage 13 from rising.

  In the first and second embodiments, in the showcase with a built-in refrigerator, in which the compressor 14a is built in the showcase body 10, the operation of the compressor 14a and the stoppage of the operation cause the inside of the commodity storage 13 However, in the case of a separate refrigerator-type showcase in which multiple showcases are connected to a single refrigerator, piping for circulating refrigerant through each showcase By opening and closing the solenoid valve provided in the case, it is possible to control the temperature in the product storage 13 as in the above embodiment.

  In the first and second embodiments, the detected temperature T1 of the first temperature detector 31 and the detected temperature T2 of the second temperature detector 32 are both predetermined with the compressor 14a operating. 1 or lower, the operation of the compressor 14a is stopped, and one or both of the detected temperature T1 of the first temperature detector 31 and the detected temperature T2 of the second temperature detector 32 are set to the second setting. When the temperature is equal to or higher than the temperature TH, the compressor 14a is started to operate, and the temperature in the product storage 13 is controlled. As shown in FIG. 14, the compressor 14a is operated ( In step S31), when the average temperature TM between the detected temperature T1 of the first temperature detector 31 and the detected temperature T2 of the second temperature detector 32 becomes equal to or lower than a predetermined first set temperature TL1 (step S32), the compression is performed. The drive of the machine 14a is stopped (step S33), when the average temperature TM of the detected temperature T1 of the first temperature detector 31 and the detected temperature T2 of the second temperature detector 32 becomes equal to or lower than a predetermined second set temperature TH1 (step S34). The same effect can be obtained by controlling the temperature in the product storage 13 by starting the operation of the machine 14a (step S31).

  In the first and second embodiments, the temperature in the product storage 13 is controlled by regulating the flow of the refrigerant in the refrigerant circuit 20 by operating the compressor 14a and stopping the operation. As shown in FIG. 15, the detected temperature T1 of the first temperature detector 31 and the detected temperature T2 of the second temperature detector 32 are compared (step S41), and the temperature detected by the higher temperature is detected. When the detected temperature of the container is higher than the predetermined set temperature TS (steps S42 and S43), the flow rate of the refrigerant flowing through the refrigerant circuits 20 and 40 is increased (step S44), and the detection of the higher temperature detector is performed. When the temperature is equal to or lower than the predetermined set temperature TS (steps S42 and S43), the flow rate of the refrigerant flowing through the refrigerant circuits 20 and 40 may be decreased (step S45). In addition, as shown in FIG. 16, the temperature control in the product storage 13 is performed by setting an average temperature TM of the detection temperature T1 of the first temperature detector 31 and the detection temperature T2 of the second temperature detector 32 to a predetermined value. When the temperature is higher than the temperature TS1 (step S51), the flow rate of the refrigerant flowing through the refrigerant circuits 20 and 40 is increased (step S52), and the detected temperature T1 of the first temperature detector 31 and the second temperature detector 32 are increased. When the average temperature TM of the detected temperature T2 is lower than the predetermined set temperature TS1 (step S51), the flow rate of the refrigerant flowing through the refrigerant circuits 20 and 40 may be decreased (step S53). In these cases, the flow rate of the refrigerant flowing through the refrigerant circuit 20 is adjusted by using the compressor 14a whose rotation speed can be adjusted by inverter control or the like as the flow rate adjusting means for adjusting the flow rate of the refrigerant flowing through the refrigerant circuits 20 and 40. You may make it increase / decrease. Further, the flow rate of the refrigerant flowing into the first evaporator 15c and the second evaporator 16c may be increased or decreased by using an expansion valve 21 such as an electronic expansion valve whose valve opening can be adjusted by the control unit 30. Good.

1 is an overall perspective view of a showcase showing a first embodiment of the present invention. Side cross-sectional view of showcase Showcase refrigerant circuit diagram Block diagram showing the control system Side sectional view of the showcase showing the flow of air flowing through the first ventilation path Side sectional view of the showcase showing the flow of air flowing through the second ventilation path Flowchart for switching control of air curtain flow direction in cooling operation Flow chart for temperature control in cooling operation Side sectional view of showcase showing air flow in rapid cooling operation Side sectional view of showcase showing air flow in defrosting operation Refrigerant circuit diagram of a showcase showing the second embodiment of the present invention Block diagram showing the control system Flowchart for switching control of air curtain flow direction in cooling operation Flow chart for temperature control showing other examples Flow chart for temperature control showing other examples Flow chart for temperature control showing other examples

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Showcase main body, 13 ... Commodity storage, 14a ... Compressor, 15 ... 1st ventilation path, 15c ... 1st evaporator, 15d ... 1st blower for evaporators, 15e ... 1st defrost heater, DESCRIPTION OF SYMBOLS 16 ... 2nd ventilation path, 16c ... 2nd evaporator, 16d ... 2nd evaporator fan, 16e ... 2nd defrost heater, 20 ... Refrigerant circuit, 40 ... Refrigerant circuit, 42a ... 1st solenoid valve 42b ... second solenoid valve, 30 ... control section, 31 ... first temperature detector, 32 ... second temperature detector.

Claims (10)

In a showcase comprising a showcase body having an opening for putting in and out of goods, and a product storage provided in the showcase body,
A first ventilation path formed between the inner surface of the showcase body and the product storage, and capable of forming an air curtain at the opening of the showcase body;
A first cooler and a first blower provided in the first ventilation path;
A second ventilation path formed between the first ventilation path and the product storage, and capable of forming an air curtain at the opening of the showcase body;
A showcase comprising a second cooler and a second blower provided in the second ventilation path. An air curtain formed by air discharged from the first ventilation path and an air curtain formed by air discharged from the second ventilation path are configured to circulate in opposite directions, respectively.
The showcase according to claim 1, further comprising cooling operation control means for performing a cooling operation by operating the first blower and the second blower alternately every predetermined time. An air curtain formed by air discharged from the first ventilation path and an air curtain formed by air discharged from the second ventilation path are configured to circulate in the same direction.
The showcase according to claim 1, further comprising a rapid cooling means for performing a rapid cooling operation by operating the first blower and the second blower simultaneously. A first heater for defrosting the first cooler;
A second heater for defrosting the second cooler;
An air curtain formed by air discharged from the first ventilation path and an air curtain formed by air discharged from the second ventilation path are configured to circulate in opposite directions, respectively.
Defrosting means for defrosting the first cooler and the second cooler by the first defrost heater and the second defrost heater by operating the first blower and the second blower simultaneously is provided. The showcase according to claim 1. A refrigerant circuit for circulating refrigerant through the first cooler and the second cooler;
A flow regulating means capable of regulating the flow of the refrigerant to the first cooler and the second cooler;
A first temperature detector for detecting the temperature of air flowing through the air suction side of the first ventilation path;
A second temperature detector for detecting the temperature of the air flowing through the air suction side of the second ventilation path;
When both the detected temperature of the first temperature detector and the detected temperature of the second temperature detector are equal to or lower than the predetermined first set temperature, the refrigerant to the first cooler and the second cooler is set by the flow regulating means. Is stopped, and one or both of the detected temperature of the first temperature detector and the detected temperature of the second temperature detector is equal to or higher than a predetermined second set temperature higher than the first set temperature. The showcase according to claim 2, further comprising distribution control means for releasing the suspension of refrigerant flow to the first cooler and the second cooler by the flow restriction means. A refrigerant circuit for circulating refrigerant through the first cooler and the second cooler;
A flow regulating means capable of regulating the flow of the refrigerant to the first cooler and the second cooler;
A first temperature detector for detecting the temperature of air flowing through the air suction side of the first ventilation path;
A second temperature detector for detecting the temperature of the air flowing through the air suction side of the second ventilation path;
When the average temperature of the detected temperature of the first temperature detector and the detected temperature of the second temperature detector becomes equal to or lower than a predetermined first set temperature, the flow restricting means supplies the first cooler and the second cooler. When the average temperature of the detected temperature of the first temperature detector and the detected temperature of the second temperature detector is equal to or higher than a predetermined second set temperature higher than the first set temperature, The showcase according to claim 2, further comprising a flow control means for releasing the suspension of the flow of the refrigerant to the first cooler and the second cooler by the flow restriction means. A refrigerant circuit for circulating refrigerant through the first cooler and the second cooler;
A flow rate adjusting means capable of adjusting a flow rate of the refrigerant flowing through the first cooler and the second cooler;
A first temperature detector for detecting the temperature of air flowing through the air suction side of the first ventilation path;
A second temperature detector for detecting the temperature of the air flowing through the air suction side of the second ventilation path;
The first cooler and the second cooler are adjusted by the flow rate adjusting means so that the higher one of the detected temperature of the first temperature detector and the detected temperature of the second temperature detector becomes the predetermined first set temperature. The showcase according to claim 2, further comprising a flow rate control unit that controls a flow rate of the refrigerant flowing through the cooler. A refrigerant circuit for circulating refrigerant through the first cooler and the second cooler;
A flow rate adjusting means capable of adjusting a flow rate of the refrigerant flowing through the first cooler and the second cooler;
A first temperature detector for detecting the temperature of air flowing through the air suction side of the first ventilation path;
A second temperature detector for detecting the temperature of the air flowing through the air suction side of the second ventilation path;
The first temperature detector and the second temperature detector are circulated to the first cooler and the second cooler by the flow rate adjusting means so that the average temperature of the detected temperatures becomes a predetermined first set temperature. The showcase according to claim 2, further comprising a flow rate control unit that controls a flow rate of the refrigerant. A refrigerant circuit in which the first cooler and the second cooler are connected in parallel;
A first on-off valve that opens and closes a refrigerant flow path to the first cooler;
A second on-off valve that opens and closes a refrigerant flow path to the second cooler;
When the first blower is operated and the second blower is stopped, the first open / close valve is opened and the second open / close valve is closed, and the first blower is stopped and the second blower is operated. The showcase according to claim 1, further comprising a flow path switching unit that closes the first on-off valve and opens the second on-off valve. A first heater for defrosting the first cooler;
A second heater for defrosting the second cooler;
By stopping the first blower and operating the second blower, the first heater is defrosted by the first heater, and the first blower is operated and the second blower is stopped. The showcase according to claim 9, further comprising a defrosting unit configured to defrost the second cooler by the second heater.

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