JP2020130197A - Show case - Google Patents

Abstract

To provide a show case which can keep respective prescribed temperature zones of an upper side and a lower side of a merchandise chamber irrespective of an ambient temperature.SOLUTION: In a show case 1, a control unit 20 continuously operates second to fourth fans 92b-92d of a first fan unit 9 and first to fourth fans 112a-112d of a second fan unit 11 for carrying out a cooling operation by a cooler 12 and operates a first heater 8 and a second heater 10 when an intermediate duct 7 is mounted, and an ambient temperature is lower than a set temperature. Therefore, a heating/cooling mode for heating an upper side merchandise chamber 41 and cooling a lower side merchandise chamber 42 is carried out.SELECTED DRAWING: Figure 9

Description

The present invention relates to a showcase that can be used as a product room in a temperature zone in which the upper side and the lower side of the product room are different.

As an example of this type of showcase, in the showcase described in Patent Document 1, cold air circulates sequentially with the front portion, the bottom portion, the back portion, the ceiling portion, and the front portion to form a cooling air curtain forward. From the first air passage, the second air passage that circulates outside the first air passage to form an uncooled air curtain that protects the cooling air curtain, and the rear portion in the middle of the first air passage. A third air passage is provided, in which cooling air is ventilated to the front portion through an intermediate shelf duct to form a cooling air curtain in front of the lower side of the intermediate shelf, and the third air passage is formed and the first air passage is formed. When is shut off, the lower part of the intermediate shelf is divided into the refrigerating temperature zone by the cooling air of the third air passage, and the upper part of the intermediate shelf is divided into the weak cooling temperature zone by the uncooled air of the second air passage. ..

JP-A-2007-187391

However, in the showcase described in Patent Document 1, there is a possibility that the upper part of the intermediate shelf cannot be maintained in the weak cold temperature zone, especially when the outside air temperature is low.

Therefore, an object of the present invention is to provide a showcase capable of maintaining the upper side and the lower side of the product room in their respective desired temperature zones regardless of the outside air temperature.

According to one aspect of the present invention, there is provided a showcase having a commodity room with an open front surface. This showcase has an upper duct provided on the upper side of the product room and having an air outlet on the front side of the product room, and an air suction port provided on the lower side of the product room and having an air suction port on the front side of the product room. A first back passage provided on the back side of the product room and communicating the inside of the upper duct and the inside of the lower duct, and the air in the passage is blown toward the upper duct on the upper side. The first back passage in which the upper fan is arranged and the cooler and the lower heater are arranged on the lower side, and the inside of the upper duct and the above are provided separately from the first back passage on the back side of the product room. A second back passage that communicates with the inside of the lower duct, and an intermediate duct that is removable from the product room, and when attached to the product room, the product room becomes the upper product room and the lower product room. The first back passage is divided into an upper back passage in which the upper fan is arranged and a lower back passage in which the cooler and the lower heater are arranged, and one end thereof becomes the air outlet. A first internal passage that opens so as to face each other and the other end opens in the upper back passage, and a second that opens so that one end faces the air suction port and the other end opens in the lower back passage. The air in the intermediate duct having an internal passage, an upper heater arranged in at least one of the portions constituting the upper back passage in the upper duct and the first back passage, and the air in the lower duct. A first lower fan that blows air toward the first rear passage, a second lower fan that blows air in the lower duct toward the second back passage, the upper fan, and a cooling operation by the cooler. The lower heater, the upper heater, the first lower fan, and a control unit capable of controlling the second lower fan are included.

In the showcase, the control unit is configured to be able to control the upper fan, the cooling operation by the cooler, the lower heater, the upper heater, the first lower fan, and the second lower fan. Therefore, when the intermediate duct is attached, the upper product chamber and the lower product chamber are cooled separately, and an air curtain with cooling air is formed on the front surface of each of the upper product chambers, and the upper product chamber is formed. It is possible to form an air curtain with warmed air on the front surface of the chamber while heating it, and to form an air curtain with cooling air on the front surface while cooling the lower product chamber. When the intermediate duct is not attached, an air curtain with cooling air is formed on the front surface of the product room while cooling the product room, and an air curtain with warm air is formed on the front surface of the product room while heating the product room. It is possible to form. Therefore, according to the showcase, the upper side (upper product room) and the lower side (lower product room) of the intermediate duct should be maintained in their respective desired temperature zones regardless of the outside air temperature. The product room can be maintained in the desired temperature range.

It is sectional drawing of the showcase which concerns on one Embodiment of this invention. It is a figure which shows the state which the inside of the lower duct of the showcase and the inside of the back duct are seen from the front side. It is an enlarged sectional view of the intermediate duct of the showcase. It is a flowchart which shows an example of the control executed by the control unit of the showcase. It is a flowchart which shows an example of the control executed by the control unit of the showcase. It is a figure for demonstrating the flow of the air when the intermediate duct is not attached in the showcase. It is a figure for demonstrating the flow of the air when the intermediate duct is not attached in the showcase. It is a figure for demonstrating the flow of air when the intermediate duct is attached in the showcase. It is a figure for demonstrating the flow of air when the intermediate duct is attached in the showcase.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a showcase 1 according to an embodiment of the present invention. As shown in FIG. 1, the showcase 1 according to the present embodiment has a case body 2 having a heat insulating structure having a U-shaped cross-sectional shape with an open front surface. An inner panel 3 is attached to the inside of the case body 2, and the inside (space) of the inner panel 3 constitutes a product room 4 having a front opening. In the product room 4, a plurality of (here, 5) product display shelves (hereinafter, simply referred to as "display shelves") 5 are installed at intervals in the vertical direction.

In the present embodiment, the ventilation duct 6 is mainly formed by the inner surface of the case body 2 and the outer surface of the inner panel 3. That is, a predetermined gap space for ventilation is formed between the inner surface of the case body 2 and the outer surface of the inner panel 3. The ventilation duct 6 is located on the upper duct 61 located on the upper side of the product room 4, the lower duct 62 located on the lower side of the product room 4, and the back side and the lower side of the upper duct 61 on the back side of the product room 4. Includes a back duct 63 that connects to the back side of the duct 62.

An intermediate duct 7 is provided in the product room 4. The intermediate duct 7 is configured to be removable from the product room 4. Specifically, in the present embodiment, the intermediate duct 7 is attached to the product chamber 4 by inserting the mounting portion 7a, which is a part thereof, into the mounting hole 31 formed in the inner panel 3, and the mounting portion 7a is attached. It is configured to be removed from the product room 4 by being pulled out from the mounting hole 31. The mounting hole 31 is formed below the display shelf (intermediate display shelf) 5 located in the middle in the vertical direction among the plurality of display shelves 5 and extends from the center in the left-right direction to the left-right direction. It has a width narrower than the width of the shelf 5. The intermediate duct 7 is provided on a support portion (not shown) provided on the display shelf (intermediate display shelf) 5 corresponding to the main body portion 7b located in the product chamber 4 when the mounting portion 7a is inserted into the mounting hole 31. It is configured to be supported. Although not particularly limited, in the present embodiment, the mounting hole 31 is formed on the lower side of the display shelf 5 at the third stage from the top, and the intermediate duct 7 has the main body 7b when the mounting portion 7a is inserted into the mounting hole 31. It is supported by a support portion (not shown) provided on the display shelf 5 on the third stage from the top.

The mounting hole 31 is provided with a closing plate 32 that is constantly urged in the direction of closing the mounting hole 31. The closing plate 32 is configured to be pressed by the mounting portion 7a of the intermediate duct 7 inserted into the mounting hole 31 to open the mounting hole 31. Further, although not shown, a plurality of slit-shaped communication holes are formed mainly below the mounting holes 31 of the inner panel 3 to communicate with the inside of the product chamber 4 and the inside of the back duct 63.

An electric first heater 8 is arranged in the upper duct 61. Although not particularly limited, in the present embodiment, the first heater 8 is attached to a portion of the inner surface of the case body 2 that forms the upper duct 61. Further, an air outlet 61a opened downward is provided on the front side of the product chamber 4 in the upper duct 61.

A first fan unit 9 for blowing air in the lower duct 62 toward the back duct 63 is arranged in the lower duct 62. The first fan unit 9 will be described later. Further, an air suction port 62a that opens upward is provided on the front side of the product chamber 4 in the lower duct 62. The air suction port 62a is arranged so as to face the air outlet 61a. The air suction port 62a does not have to be strictly opposed to the air outlet 61a, and may be substantially opposed to the air outlet 61a.

Inside the rear duct 63, the electric second heater 10 is directed from the upper side (closer to the upper duct 61) to the lower side (closer to the lower duct 62), and the air in the back duct 63 is directed toward the upper duct 61. A second fan unit 11, a cooler 12, and an electric third heater 13 are arranged to blow air.

FIG. 2 shows a state in which the inside of the lower duct 62 and the inside of the back duct 63 are viewed from the front side. As shown in FIG. 2, a pair of partition plates 64, 64 are provided in the back duct 63, each extending in the vertical direction and partitioning the back duct 63 in the left-right direction. The pair of partition plates 64, 64 are arranged at intervals of substantially the same as or slightly smaller than the width of the mounting holes 31 (indicated by the imaginary line (dashed-dotted line) in FIG. 2), and are arranged with the lower duct 62. It extends from the vicinity of the connection portion with the rear duct 63 to the upper side of the mounting hole 31 (here, a position corresponding to the height of the display shelf 2 in the second stage from the top) (see FIG. 1).

In the back duct 63, the second heater 10 is arranged above the pair of partition plates 64, 64. Although not particularly limited, in the present embodiment, the second heater 10 is attached to a portion forming the upper portion of the back duct 63 on the inner surface of the case body 2.

The second fan unit 11 is erected on the upper surfaces of the pair of partition plates 64, 64. Therefore, in the present embodiment, the second fan unit 11 is arranged in the back duct 63 at a position substantially the same height as the display shelf 5 on the second stage from the top. In the present embodiment, the second fan unit 11 has fan brackets 111 erected on the upper surfaces of the pair of partition plates 64, 64, and four electric fans (first to fourth) fans 112a to 112d are incorporated in the fan bracket 111 at equal intervals in the left-right direction. However, the present invention is not limited to this, and the second fan unit 11 may have at least one fan.

The cooler 12 is located in the lower part of the back duct 63 and is arranged between the pair of partition plates 64, 64. The cooler 12 is mounted on a support (not shown) so that air from the lower duct 62 side can pass through. A part of the cooler 12 may be arranged in the lower duct 62.

The cooler 12 is connected to the condensing unit 16 housed in the machine room 15 below the product room 4 via the refrigerant pipe 14 (see FIGS. 1 and 2). The condensin unit 16 includes an electric compressor and a condenser (or gas cooler) (not shown). Further, an expander 17 is arranged in the vicinity of the cooler 12. The condensin unit 16 is configured to supply low-temperature and high-pressure refrigerant to the cooler 12 via the expander 17 and return the refrigerant that has passed through the cooler 12. The cooler 12 executes a cooling operation when the compressor operates and a low-temperature / high-pressure refrigerant is supplied from the condensing unit 16 to a low-temperature / low-pressure in the expander 17, and the operation of the compressor is stopped. When the supply of the low-temperature and high-pressure refrigerant from the condensing unit 16 is stopped, the cooling operation is stopped.

The third heater 13 is attached to the front surface of the cooler 12 (see FIG. 1). Although not shown, the front surface of the cooler 12 is covered with a panel material, and the third heater 13 is attached to the panel material so as to be located between the cooler 12 and the panel material. However, it is not limited to this. The third heater 13 may be attached to a portion located between the pair of partition plates 64, 64 on the inner surface of the case body 2 and between the attachment hole 31 and the cooler 12.

Here, in the back duct 63, roughly divided, it is located above the pair of partition plates 64, 64 and is located between the upper space S1 and the pair of partition plates 64, 64 in which the second heater 10 is arranged. The space between the partition plates S2 in which the upper second fan unit 11 is arranged and the cooler 12 and the third heater 13 are arranged in the lower part, and the space between the partition plates S2 when viewed from the front side (a pair of partition plates). A left space S3 located on the left side of 64, 64) and a right space S4 located on the right side of the partition plate space S2 when viewed from the front side are formed. Further, in the present embodiment, the upper part of the right side space S4 is closed by the closing plate 65.

Therefore, in the present embodiment, two passages communicating with each other in the upper duct 61 and the lower duct 62 are formed in the back duct 63. One of the two passages is a passage formed by the upper space S1 and the space between partition plates S2, that is, the second heater 10 and the second fan unit 11 are arranged on the upper side and the cooler on the lower side. A passage (hereinafter referred to as “first back passage”) 66 in which the 12 and the third heater 13 are arranged. The other of the two passages is a passage mainly formed by the left space S3, that is, a passage that bypasses the cooler 12 and the third heater 13 and communicates with the inside of the upper duct 61 and the inside of the lower duct 62 ( Hereinafter referred to as "second back passage") 67. In the present embodiment, the second back passage 67 is arranged on the left side of the first back passage 66. However, the present invention is not limited to this, and the second back passage 67 may be arranged on the right side or the back side (rear side) of the first back passage 66. The refrigerant pipe 14 and the expander 17 are arranged in the right space S4 whose upper portion is closed.

Next, the first fan unit 9 arranged in the lower duct 62 will be described.
As shown in FIG. 2, in the present embodiment, the first fan unit 9 is arranged substantially in the center in the left-right direction in the lower duct 62. The first fan unit 9 has a fan duct 91 that extends in the left-right direction and the back side of the product chamber 4 is open, and four electric fans (first to fourth fans) 92a to 92d are fan ducts 91. It is attached to the upper surface of the fan with a space in the left-right direction.

When the first to fourth fans 92a to 92d operate, the first fan unit 9 guides the air in the lower duct 62 into the fan duct 91, passes through the fan duct 91, and blows air toward the rear duct 63. It is configured in. Here, as shown by a broken line in FIG. 2, in the present embodiment, the air guided into the fan duct 91 by the operation of the leftmost first fan 92a is introduced into the left space S3 of the rear duct 63 (that is, that is, A guide plate 911 that guides the vehicle toward the rear passage 67) is provided in the fan duct 91.

Therefore, as shown by an arrow in FIG. 2, the first fan unit 9 secondizes the air in the lower duct 62 by the operation of the leftmost first fan 92a among the first to fourth fans 92a to 92d. Air is blown toward the back passage 67 (left space S3), and the air in the lower duct 62 is directed toward the first back passage 66 (space between partition plates S2) by the operation of the remaining second and fourth fans 92b to 92d. Blow. As in the case of the second fan unit 11, the first fan unit 9 blows the air in the lower duct 62 toward the second back passage 67 with at least one fan and the air in the lower duct 62. It suffices to have at least one fan that blows air toward the first back passage 66.

Next, the intermediate duct 7 will be described.
In the present embodiment, the mounting portion 7a of the intermediate duct 7 has a width dimension substantially equal to the distance between the pair of partition plates 64, 64 and a depth dimension substantially equal to that of the back duct 63. Further, the main body 7b of the intermediate duct 7 has a width dimension substantially equal to that of the product room 4 and a depth dimension larger than that of the display shelf 5. Therefore, when the intermediate duct 7 is attached to the product room 4, the partition plate space S2 is divided into an upper side and a lower side by the mounting portion 7a of the intermediate duct 7. Further, in the first back passage 66, the upper back passage 661 in which the second heater 10 and the second fan unit 11 are arranged, the cooler 12 and the third heater 13 are arranged by the mounting portion 7a of the intermediate duct 7. It is divided into a lower back passage 662 provided (see FIG. 1). Further, when the intermediate duct 7 is attached to the product room 4, the product room 4 is divided into an upper product room 41 and a lower product room 42 by the main body 7b of the intermediate duct 7 (see FIG. 1).

FIG. 3 is an enlarged cross-sectional view of the intermediate duct 7.
As shown in FIGS. 1 and 3, the inside of the intermediate duct 7 is vertically divided by a heat insulating member 71. A first introduction port 72 facing the air outlet 61a when the intermediate duct 7 is attached to the product chamber 4 is formed in the vicinity of the end portion on the upper surface of the main body portion 7b opposite to the mounting portion 7a. A first outlet 73 is formed on the upper surface of the mounting portion 7a in the vicinity of the end opposite to the main body portion 7b, which opens into the upper back passage 661 when the intermediate duct 7 is mounted in the product room 4. ing. Therefore, a passage 74 (hereinafter referred to as “first intermediate passage”) 74 is formed in the intermediate duct 7 from the first introduction port 72 to the first outlet port 73 via the space above the heat insulating member 71. In other words, the intermediate duct 7 has one end opened as a first introduction port 72 facing the air outlet 61a and the other end in the upper back passage 661 when the intermediate duct 7 is attached to the product room 4. It has a first intermediate passage 74 that opens as one outlet 73. The first introduction port 72 does not have to face the air outlet 61a exactly, but may generally face the air outlet 61a.

A second outlet 75 facing the air suction port 62a is formed on the lower surface of the main body 7b in the vicinity of the end opposite to the mounting portion 7a when the intermediate duct 7 is mounted in the product room 4, and the mounting portion is formed. A second introduction port 76 that opens into the lower back passage 662 when the intermediate duct 7 is attached to the product room 4 is formed in the vicinity of the end portion on the lower surface of the 7a opposite to the main body portion 7b. Therefore, a passage (hereinafter referred to as "second intermediate passage") 77 is formed in the intermediate duct 7 from the second introduction port 76 to the second outlet 75 via the space under the heat insulating member 71. In other words, when the intermediate duct 7 is attached to the product room 4, one end of the intermediate duct 7 opens as a second outlet 75 facing the air suction port 62a, and the other end enters the lower back passage 662. A second intermediate passage 77 that opens as a second introduction port 76 is provided below the first intermediate passage 74. The second outlet 75 does not have to face the air suction port 62a exactly, but may generally face the air suction port 62a.

Returning to FIG. 1, an intermediate duct sensor 21 for detecting the presence / absence of the intermediate duct 7 (that is, whether or not the intermediate duct 7 is attached to the product room 4) is provided in the product room 4 or the back duct 63. There is. In the present embodiment, the intermediate duct sensor 21 is mounted in the vicinity of the mounting hole 31 in the back duct 63, for example, at a position corresponding to the mounting hole 31 on the inner surface of the case body 2, depending on the presence or absence of the intermediate duct 7. Output the signal. Although not particularly limited, it is caused by the magnetic force of a push switch that operates by being pressed by the mounting portion 7a of the intermediate duct 7 inserted into the mounting hole 31 or a magnet (not shown) attached to the end of the mounting portion 7a of the intermediate duct 7. An operating reed switch can be used as the intermediate duct sensor 21.

Further, the showcase 1 is provided with an outside air temperature sensor 22 that detects the outside air temperature. In the present embodiment, the outside air temperature sensor 22 is installed on the side surface of the showcase 1, and the outside air temperature sensor 22 outputs a signal according to the outside air temperature. However, the present invention is not limited to this, and the outside air temperature sensor 22 can be installed at any place in the showcase 1.

The operation of the showcase 1 is mainly controlled by the control unit 20 installed on the upper surface of the case body 2. In the present embodiment, when the intermediate duct 7 is not attached to the control unit 20, that is, when the product room 4 is not divided into the upper product room 41 and the lower product room 42, the product room 4 ( The operation of the showcase 1 is controlled so that the temperature of the whole) maintains the set temperature TS (for example, 18 to 22 ° C.) suitable for lunch boxes and delicatessen items. Further, in the control unit 20, when the intermediate duct 7 is attached, that is, when the product room 4 is divided into the upper product room 41 and the lower product room 42, the temperature of the upper product room 41 is raised. Show so that the set temperature TS is maintained and the temperature of the lower product chamber 42 is maintained at a predetermined temperature lower than the set temperature TS, for example, a refrigerating temperature of 0 to 10 ° C. or a chilled temperature (hereinafter referred to as “refrigerating temperature or the like”). Control the operation of case 1.

Specifically, in the present embodiment, the control unit 20 has the first heater 8 and the first fan based on the output signal (detection result) of the intermediate duct sensor 21 and the output signal (detection result) of the outside temperature sensor 22. The fans 92a to 92d of the unit 9, the second heater 10, the fans 112a to 112d of the second fan unit 11, the cooling operation by the cooler 12, and the third heater 13 are controlled. Regarding the cooling operation by the cooler 12, the control unit 20 mainly executes the cooling operation by the cooler 12 by operating the compressor constituting the condensing unit 16 or stopping the operation of the compressor. Alternatively, the cooling operation by the cooler 12 is stopped.

Hereinafter, the control to be executed by the control unit 20 will be specifically described. 4 and 5 are flowcharts showing an example of the control executed by the control unit 20. This flowchart starts when Showcase 1 is activated. In the following description, the expression "to be in a stopped state" includes stopping the operation and maintaining the stopped state.

In step S1, it is determined whether or not the intermediate duct 7 is attached based on the output signal (detection result) of the intermediate duct sensor 21. If the intermediate duct 7 is not attached (step S1: NO), the process proceeds to step S2. As described above, when the intermediate duct 7 is not attached, the product room 4 is not divided into the upper product room 41 and the lower product room 42. Therefore, the control unit 20 controls the operation of the showcase 1 so that the temperature of the product room 4 (overall) maintains the set temperature TS (steps S2 to S9). On the other hand, when the intermediate duct 7 is attached (step S1: YES), the process proceeds to step S10. As described above, when the intermediate duct 7 is attached, the product room 4 is divided into an upper product room 41 and a lower product room 42. Therefore, the control unit 20 controls the operation of the showcase 1 so that the temperature of the upper product chamber 41 maintains the set temperature TS and the temperature of the lower product chamber 42 maintains the refrigeration temperature or the like (steps S10 to 10). S17). When the intermediate duct 7 is attached, the first back passage 66 is divided into an upper back passage 661 and a lower back passage 662.

In step S2, the "overall cooling mode" for cooling the entire product room 4 is executed. Specifically, the control unit 20 continuously operates the first to fourth fans 92a to 92d of the first fan unit 9 and the first to fourth fans 112a to 112d of the second fan unit 11, and the cooler 12 Perform the cooling operation by. Further, the control unit 20 puts the first heater 8, the second heater 10, and the third heater 13 in a stopped state.

Then, air is sucked into the lower duct 62 from the air suction port 62a, and the sucked air passes through the lower duct 62 and is guided to the first back passage 66 and the second back passage 67 in the back duct 63. The air guided to the first back passage 66 is cooled by the cooler 12 and introduced into the upper duct 61, passes through the upper duct 61, and blows out from the air outlet 61a toward the air suction port 62a of the lower duct 62. Will be done. Further, the air guided to the second back passage 67 is also introduced into the upper duct 61.

Therefore, as shown by the white arrows in FIG. 6, the cooling air is supplied to the first back passage 66, the upper duct 61, the front surface of the product chamber 4 (between the air outlet 61a and the air suction port 62a), and the lower part. It circulates in the order of duct 62. As a result, the product room 4 is cooled and an air curtain with cooling air is formed on the front surface of the product room 4. In other words, the first circulating air passage that circulates the cooling air and forms an air curtain by the cooling air is formed on the front surface of the product chamber 4. Further, as shown by the broken line arrow in FIG. 6, the air passing through the second back passage 67 is also introduced into the upper duct 61 and mixed with the cooling air circulating in the first circulation air passage. Therefore, even if the outside air temperature is high, the temperature of the entire product room 4 can be uniformly maintained at the set temperature TS.

Here, the control unit 20 that executes the "overall cooling mode" is the first to fourth fans 92a to 92d of the first fan unit 9 and the first to fourth fans of the second fan unit 11 according to the outside air temperature. The control of the fans 112a to 112d may be changed. For example, the control unit 20 that executes the "overall cooling mode" increases the flow rate of air passing through the first back passage 66 (that is, the flow rate of cooling air circulating in the first circulating air passage) as the outside air temperature rises. Do more. The control unit 20 that executes the "overall cooling mode" increases the rotation speeds of the second to fourth fans 92b to 92d of the first fan unit 9 and the first to fourth fans 112a to 112d of the second fan unit 11. By doing so, the flow rate of the cooling air circulating in the first circulation air passage can be increased. By doing so, when the outside air temperature is high, an air curtain by the cooling air can be surely formed on the front surface of the product room 4, and the temperature of the product room 4 can be more accurately maintained at the set temperature TS.

Further, the control unit 20 that executes the "overall cooling mode" increases or decreases the rotation speed of the first fan 91a of the first fan unit 9 according to the outside temperature, thereby circulating the first circulation air passage. The temperature of the cooling air that circulates in the first circulating air passage by adjusting the flow rate of the air that has passed through the second back passage 67 (that is, the flow rate of the air that bypasses the cooler 12), which is mixed with the cooling air. As a result, it is possible to finely adjust the temperature of the product room 4.

In step S3, it is determined whether or not the intermediate duct 7 is attached based on the output signal (detection result) of the intermediate duct sensor 21. If the intermediate duct 7 is not attached (step S3: NO), the process proceeds to step S4. On the other hand, when the intermediate duct 7 is attached (step S3: YES), that is, when the intermediate duct 7 is attached during the execution of the "overall cooling mode", the process proceeds to step S10, and "cooling / cooling / Execute the "cooling mode" (shift from the "overall cooling mode" to the "cooling / cooling mode").

In step S4, the outside air temperature is detected based on the output signal (detection result) of the outside air temperature sensor 22.

In step S5, it is determined whether or not the outside air temperature detected in step S4 is less than the first threshold temperature Tth1. When the outside air temperature is equal to or higher than the first threshold temperature Tth1 (step S5: NO), the "overall cooling mode" is continued. On the other hand, when the outside air temperature is less than the first threshold temperature Tth1 (step S5: YES), that is, when the outside air temperature becomes less than the first threshold temperature Tth1 during the execution of the "overall cooling mode", step S6. Proceed to. In the present embodiment, the first threshold temperature Tth1 is set to the lower limit value (for example, 18 ° C.) of the set temperature TS. However, it is not limited to this. The first threshold temperature Tth1 can be arbitrarily set according to the set temperature TS, the size (volume) of the product room 4, and the like.

In step S6, the "overall heating mode" for heating the entire product room 4 is executed (shifting from the "overall cooling mode" to the "overall heating mode"). Specifically, the control unit 20 continuously operates the first to fourth fans 92a to 92d of the first fan unit 9 and the first to fourth fans 112a to 112d of the second fan unit 11, and also causes the first heater. 8. Operate the second heater 10 and the third heater 13. Further, the control unit 20 stops the cooling operation by the cooler 12.

Then, air is sucked into the lower duct 62 from the air suction port 62a, and the sucked air passes through the lower duct 62 and is guided to the first back passage 66 and the second back passage 67 in the back duct 63. The air guided to the first back passage 66 is heated by the third heater 13 and the second heater 10 and introduced into the upper duct 61, and after being further heated by the first heater 8 in the upper duct 61, air is blown. It is blown out from the outlet 61a toward the air suction port 62a of the lower duct 62. Further, the air guided to the second back passage 67 is also introduced into the upper duct 61.

Therefore, as shown by the black arrows in FIG. 7, the heated air is supplied to the first back passage 66, the upper duct 61, and the front surface of the product chamber 4 (between the air outlet 61a and the air suction port 62a). And the lower duct 62 circulate in this order. As a result, the product room 4 is heated and an air curtain by the heated air is formed on the front surface of the product room 4. In other words, a second circulating air passage is formed in which the warmed air circulates and forms an air curtain by the warmed air on the front surface of the product room 4. Further, as shown by the broken line arrow in FIG. 7, the air passing through the second back passage 67 is also introduced into the upper duct 61 and mixed with the warmed air circulating in the second circulation air passage, and the first heater. It is heated by 8. Therefore, even when the outside air temperature is low, the temperature of the entire product room 4 can be uniformly maintained at the set temperature TS.

Here, the control unit 20 that executes the "overall heating mode" may change the control of the first heater 8, the second heater 10, and the third heater 13 according to the outside air temperature. For example, in the control unit 20 that executes the "overall heating mode", when the difference between the set temperature TS and the outside air temperature is equal to or greater than the first predetermined value, the first heater 8, the second heater 10, and the third heater 13 is operated, and when the difference between the set temperature TS and the outside air temperature is less than the first predetermined value, the third heater 13 is operated and at least one of the first heater 8 and the second heater 10 is stopped or intermittently operated. Let me. By doing so, the temperature of the product room 4 can be more accurately maintained at the set temperature TS when the outside air temperature is low.

Further, the control unit 20 that executes the "overall heating mode" has the first to fourth fans 92a to 92d of the first fan unit 9 and the first to fourth fans of the second fan unit 11 according to the outside air temperature. The control of the fans 112a to 112d may be changed. For example, in the control unit 20 that executes the "overall heating mode", the lower the outside air temperature, the more the flow rate of air passing through the first back passage 66 (that is, the flow rate of warm air circulating in the first circulating air passage). ) Is increased. The control unit 20 that executes the "overall heating mode" determines the rotation speeds of the second to fourth fans 92b to 92d of the first fan unit 9 and the first to fourth fans 112a to 112d of the second fan unit 11. By increasing the amount, the flow rate of the heated air circulating in the first circulating air passage can be increased. By doing so, when the outside air temperature is low, an air curtain by the heated air can be surely formed on the front surface of the product room 4, and the temperature of the product room 4 can be more accurately maintained at the set temperature TS.

Further, the control unit 20 that executes the "overall heating mode" stops the first heater 8 and increases / decreases the rotation speed of the first fan 91a of the first fan unit 9 according to the outside air temperature, thereby increasing or decreasing the rotation speed. , The flow rate of the air passing through the second back passage 67 mixed with the warmed air circulating in the second circulation air passage (that is, the flow rate to the air bypassing the third heater 13) is adjusted to adjust the second. It is also possible to finely adjust the temperature of the heated air circulating in the circulating air passage, and by extension, the temperature of the product room 4.

Step S7 determines whether or not the intermediate duct 7 is attached based on the output signal (detection result) of the intermediate duct sensor 21. If the intermediate duct 7 is not attached (step S7: NO), the process proceeds to step S8. On the other hand, when the intermediate duct 7 is attached (step S7: YES), that is, when the intermediate duct 7 is attached during the execution of the "overall heating mode", the process proceeds to step S14, and "addition" described later is performed. Execute the "warming / cooling mode" (shift from the overall heating mode to the "heating / cooling mode").

In step S8, the outside air temperature is detected based on the output signal (detection result) of the outside air temperature sensor 22.

In step S9, it is determined whether or not the outside air temperature detected in step S8 is equal to or higher than the second threshold temperature Tth2, which is higher than the first threshold temperature Tth1. When the outside air temperature is less than the second threshold temperature Tth2 (step S9: NO), the "total heating mode" is continued. On the other hand, when the outside air temperature becomes the second threshold temperature Tth2 or more (step S9: YES), that is, when the outside air temperature becomes the second threshold temperature Tth2 or more during the execution of the "overall heating mode", the step. Proceed to S2 and execute the "overall cooling mode" (shift from the "overall heating mode" to the "overall cooling mode"). In the present embodiment, the second threshold temperature Tth2 is set to the upper limit value (for example, 22 ° C.) of the set temperature TS. However, it is not limited to this. The second threshold temperature Tth2 may be a temperature higher than the first threshold temperature Tth1, and can be arbitrarily set according to the set temperature TS, the size (volume) of the product room 4, and the like.

In step S10, a "cooling / cooling mode" is executed in which the upper product chamber 41 and the lower product chamber 42 are cooled separately. Specifically, the control unit 20 intermittently operates the first fan 92a of the first fan unit 9, and causes the second to fourth fans 92b to 92d of the first fan unit 9 and the first to second fans of the second fan unit 11. The fourth fans 112a to 112d are continuously operated, and the cooling operation by the cooler 12 is executed. Further, the control unit 20 puts the first heater 8, the second heater 10, and the third heater 13 in a stopped state.

Then, below the intermediate duct 7, air is sucked into the lower duct 62 from the air suction port 62a, and the sucked air passes through the lower duct 62 to the lower back passage 662 and the second back passage 67. be introduced. The air introduced into the lower back passage 662 is cooled by the cooler 12 and introduced from the second introduction port 76 of the intermediate duct 7 into the second intermediate passage 77 of the intermediate duct 7, and passes through the second intermediate passage 77. It is blown out from the second outlet 75 of the intermediate duct 7 toward the air suction port 62a. The air introduced into the second back passage 67 passes through the second back passage 67 and is introduced into the upper duct 61.

Therefore, as shown by the white arrows in FIG. 8, the cooling air is the lower back passage 662, the second intermediate passage 77 of the intermediate duct 7, and the front surface of the lower product chamber 42 (second outlet 75 and air). It circulates in this order between the suction port 62a) and the lower duct 62. That is, the third circulation air passage that circulates the cooling air and forms an air curtain by the cooling air is formed on the front surface of the lower product chamber 42. Therefore, even when the outside air temperature is high, the temperature of the lower product chamber 42 can be maintained at the refrigerating temperature or the like.

Here, the control unit 20 that executes the "cooling / cooling mode" may change the control of the second to fourth fans 92b to 92d of the first fan unit 9 according to the outside air temperature. For example, in the control unit 20 that executes the "cooling / cooling mode", the higher the outside air temperature, the larger the flow rate of air passing through the lower back passage 662 (that is, the cooling air circulating in the third circulation air passage). To do. The control unit 20 that executes the "cooling / cooling mode" circulates in the third circulation air passage by increasing the rotation speed of at least one of the second to fourth fans 92b to 92d of the first fan unit 9. The flow rate of cooling air can be increased. By doing so, when the outside air temperature is high, an air curtain by cooling air can be surely formed on the front surface of the lower product chamber 42, and the temperature of the lower product chamber 42 is more accurately maintained at the refrigerating temperature or the like. obtain.

Above the intermediate duct 7, air is introduced from the first introduction port 72 of the intermediate duct 7 into the first intermediate passage 74 of the intermediate duct 7, and the introduced air passes through the first intermediate passage 74 to lead the first guide. It is led out from the exit 73 into the upper back passage 661. The air led out in the upper back passage 661 is introduced into the upper duct 61. In addition, air that has passed through the second back passage 67 is also introduced into the upper duct 61. The air introduced into the upper duct 61 passes through the upper duct 61 and is blown out from the air outlet 61a toward the first introduction port 72 of the intermediate duct 7. Here, the air that passes through the upper back passage 661 and is introduced into the upper duct 61 is uncooled air (uncooled air), and the air that passes through the second back passage 67 and is introduced into the upper duct 61. Includes air sucked into the lower duct 62 from the air suction port 62a, that is, cooling air circulating in the third circulation air passage. Therefore, the air-fuel mixture of the uncooled air and the cooled air is blown out from the air outlet 61a toward the first introduction port 72 of the intermediate duct 7. The air-fuel mixture blown out has a lower temperature than the uncooled air and a higher temperature than the cooling air.

Therefore, as shown by the hatching arrows in FIG. 8, the air-fuel mixture (weakly cooled air) is in the upper duct 61 and in front of the upper product chamber 41 (between the air outlet 61a and the first introduction port 72). , The first intermediate passage 74 of the intermediate duct 7 and the upper back passage 661 circulate in this order. As a result, the upper product chamber 41 is cooled (weakly cooled), and an air curtain by the air-fuel mixture (weakly cooled air) is formed on the front surface of the upper product chamber 41. In other words, a fourth circulating air passage is formed in which the weakly cooled air circulates to form an air curtain by the weakly cooled air on the front surface of the upper product chamber 41. Therefore, the temperature of the upper product chamber 41 can be maintained at the set temperature TS even when the outside air temperature is high.

Here, the control unit 20 that executes the "cooling / cooling mode" may adjust the ratio of the cooling air in the air-fuel mixture according to the outside air temperature. For example, the control unit 20 increases the proportion of cooling air in the air-fuel mixture as the outside air temperature rises. The control unit 20 that executes the "cooling / cooling mode" may reduce the disconnection time (longer operating time) of the first fan 9a of the first fan unit 9 and / or the first of the second fan unit 11. The ratio of the cooling air in the air-fuel mixture can be increased by reducing or stopping at least one rotation speed of the fourth fans 112a to 112d. In this way, since the cooling capacity of the air-fuel mixture is adjusted, the temperature of the upper product chamber 41 can be more accurately maintained at the set temperature TS.

In step S11, it is determined whether or not the intermediate duct 7 is attached based on the output signal (detection result) of the intermediate duct sensor 21. If the intermediate duct 7 is not attached (step S11: NO), that is, if the intermediate duct 7 is removed during the execution of the "cooling / cooling mode", the process proceeds to step S2, and the "overall cooling mode" is performed. (Transition from the "cooling / cooling mode" to the "overall cooling mode". On the other hand, when the intermediate duct 7 is attached (step S11: YES), the process proceeds to step S12.

In step S12, the outside air temperature is detected based on the output signal (detection result) of the outside air temperature sensor 22.

In step S13, it is determined whether or not the outside air temperature detected in step S12 is less than the first threshold temperature Tth1. When the outside air temperature is equal to or higher than the first threshold temperature Tth1 (step S13: NO), the "cooling / cooling mode" is continued. On the other hand, when the outside air temperature is less than the first threshold temperature Tth1 (step S13: YES), that is, when the outside air temperature becomes less than the first threshold temperature Tth1 during the execution of the "cooling / cooling mode", the step. Proceed to S14.

In step S14, a "warming / cooling mode" for heating the upper product chamber 41 and cooling the lower product chamber 42 is executed (shifting from the "cooling / cooling mode" to the "heating / cooling mode"). ). Specifically, the control unit 20 continuously operates the second to fourth fans 92b to 92d of the first fan unit 9 and the first to fourth fans 112a to 112d of the second fan unit 11 by the cooler 12. A cooling operation is performed, and the first heater 8 and the second heater 10 are operated. Further, the control unit 20 puts the first fan 92a and the third heater 13 of the first fan unit 9 in a stopped state.

Then, above the intermediate duct 7, air is introduced from the first introduction port 72 of the intermediate duct 7 into the first intermediate passage 74 of the intermediate duct 7, and the introduced air passes through the first intermediate passage 74. It is led out from the first outlet 73 into the upper back passage 661. The air led out in the upper back passage 661 is heated by the second heater 10 and introduced into the upper duct 61, further heated by the first heater 8 in the upper duct 61, and then from the air outlet 61a to the intermediate duct. It is blown out toward the first introduction port 72 of 7.

Therefore, as shown by the black arrows in FIG. 9, the heated air is supplied to the upper duct 61, the front surface of the upper product chamber 41 (between the air outlet 61a and the first introduction port 72), and the intermediate duct 7. The first intermediate passage 74 and the upper back passage 661 are circulated in this order. As a result, the upper product chamber 41 is heated, and an air curtain with heated air is formed on the front surface of the upper product chamber 41. In other words, a fifth circulating air passage is formed in which the warmed air circulates and forms an air curtain by the warmed air on the front surface of the upper product chamber 41. Therefore, the temperature of the upper product chamber 41 can be maintained at the set temperature TS even when the outside air temperature is low.

Here, the control unit 20 that executes the "heating / cooling mode" may change the control of the first heater 8 and the second heater 10 according to the outside air temperature. For example, the control unit 20 that executes the "heating / cooling mode" operates the first heater 8 and the second heater 10 when the difference between the set temperature TS and the outside air temperature is equal to or greater than the second predetermined value. When the difference between the set temperature TS and the outside air temperature is less than the second predetermined value, one of the first heater 8 and the second heater 10 is operated and the other of the first heater 8 and the second heater 10 is stopped. Or it is operated intermittently. By doing so, the temperature of the upper product chamber 41 can be more accurately maintained at the set temperature TS when the outside air temperature is low.

Further, the control unit 20 that executes the "heating / cooling mode" may change the control of the first to fourth fans 112a to 112d of the second fan unit 11 according to the outside air temperature. For example, the control unit 20 that executes the "heating / cooling mode" reduces the flow rate of air passing through the upper back passage 661 (that is, the heated air circulating in the fourth circulation air passage) as the outside air temperature is lower. Do more. The control unit 20 can increase the flow rate of the heated air circulating in the fifth circulating air passage by increasing the rotation speeds of the first to fourth fans 112a to 112d of the second fan unit 11. By doing so, when the outside air temperature is low, an air curtain by warmed air can be reliably formed on the front surface of the upper product chamber 41, and the temperature of the upper product chamber 41 can be more accurately maintained at the set temperature TS. ..

Below the intermediate duct 7, air is sucked into the lower duct 62 from the air suction port 62a, and the sucked air passes through the lower duct 62 and is introduced into the lower back passage 662. The air introduced into the lower back passage 662 is cooled by the cooler 12 and introduced from the second introduction port 76 of the intermediate duct 7 into the second intermediate passage 77 of the intermediate duct 7, and passes through the second intermediate passage 77. It is blown out from the second outlet 75 of the intermediate duct 7 toward the air suction port 62a.

Therefore, as shown by the white arrows in FIG. 9, the cooling air is supplied to the lower back passage 662, the second intermediate passage 77 of the intermediate duct 7, and the front surface of the lower product chamber 42 (second outlet 75 and air). It circulates in the order of the suction port 62a) and the lower duct 62. That is, the third circulation air passage that circulates the cooling air to form an air curtain by the cooling air is formed on the front surface of the lower product chamber 42, and the temperature of the lower product chamber 42 can be maintained at the refrigerating temperature or the like.

Here, the control unit 20 that executes the "heating / cooling mode" may change the control of the second to fourth fans 92b to 92d of the first fan unit 9 according to the outside air temperature. For example, the control unit 20 that executes the "heating / cooling mode" reduces the flow rate of air passing through the lower back passage 662 (that is, the cooling air circulating in the fifth circulation air passage) as the outside air temperature becomes lower. Reduce. The control unit 20 reduces the flow rate of the cooling air circulating in the fifth circulation air passage by reducing or stopping at least one rotation speed of the second to fourth fans 92b to 92d of the first fan unit 9. Can be done. By doing so, the temperature of the lower product chamber 42 can be maintained at the refrigerating temperature or the like, and the power consumption can be reduced.

In step S15, it is determined whether or not the intermediate duct 7 is attached based on the output signal (detection result) of the intermediate duct sensor 21. If the intermediate duct 7 is not attached (step S15: NO), that is, if the intermediate duct 7 is removed during the execution of the "heating / cooling mode", the process proceeds to step S6, and the "overall heating" is performed. Execute the "mode" (shift from the "heating / cooling mode" to the "overall heating mode"). On the other hand, when the intermediate duct 7 is attached (step S15: YES), the process proceeds to step S16.

In step S16, the outside air temperature is detected based on the output signal (detection result) of the outside air temperature sensor 22.

In step S17, it is determined whether the outside air temperature detected in step S16 is equal to or higher than the second threshold temperature Tth2. When the outside air temperature is less than the second threshold temperature Tth2 (step S17: NO), the "heating / cooling mode" is continued. On the other hand, when the outside air temperature becomes the second threshold temperature Tth2 or more (step S17: YES), that is, when the outside air temperature becomes the second threshold temperature Tth2 or more during the execution of the "heating / cooling mode". The process proceeds to step S10, and the "cooling / cooling mode" is executed (shifting from the "heating / cooling mode" to the "cooling / cooling mode").

As described above, in the present embodiment, the control unit 20 has the "overall cooling mode" and the "overall cooling mode" based on the output signal (detection result) of the intermediate duct sensor 21 and the output signal (detection result) of the outside air temperature sensor 22. It is configured to selectively execute either the "overall heating mode", the "cooling / cooling mode", or the "heating / cooling mode". Therefore, it is not necessary for the operator to input the presence / absence of the intermediate duct 7 to the control unit 20 by operating a switch or the like, and the inside of the product room 4 is automatically maintained at the optimum temperature state according to the presence / absence of the intermediate duct 7. Will be done. In addition, a temperature abnormality in the product room 4 due to an erroneous switch operation or the like is prevented.

In the showcase 1 according to the present embodiment, the first to fourth fans 112a to 112d of the second fan unit 11 correspond to the "upper fan" of the present invention, and the third heater 13 becomes the "lower heater" of the present invention. The first heater 8 and the second heater 10 correspond to the "upper heater" of the present invention, and the second to fourth fans 9b to 9d of the first fan unit 9 correspond to the "first lower fan" of the present invention. The first fan 9a of the first fan unit 9 corresponds to the "second lower fan" of the present invention.

In the above-described embodiment, the control unit 20 determines whether or not the intermediate duct 7 is attached based on the output signal (detection result) of the intermediate duct sensor 21. However, it is not limited to this. The control unit 20 may determine whether or not the intermediate duct 7 is attached based on a signal from a switch or the like operated by the operator when the intermediate duct 7 is attached or removed.

Further, in the above-described embodiment, the control unit 20 of the first heater 8 and the first fan unit 9 is based on the output signal (detection result) of the intermediate duct sensor 21 and the output signal (detection result) of the outside temperature sensor 22. The fans 92a to 92d, the second heater 10, the fans 112a to 112d of the second fan unit 11, the cooling operation by the cooler 12, and the third heater 13 are controlled. However, it is not limited to this. Instead of the output signal (detection result) of the outside air temperature sensor 22, the output signal (detection result) of the upper temperature detection sensor that detects the upper temperature in the product room 4 may be used. This is because the product room 4 of the showcase 1 has an open front surface, so that the outside air temperature can be substantially detected by detecting the upper temperature inside the product room 4. Since the upper temperature detection sensor is arranged in the product room 4, it has an advantage that it is less affected by external airflow and the like than the outside air temperature sensor 22, and stable temperature control becomes possible. The upper temperature detection sensor is arranged above the mounting hole 31 in the product room 4. For example, the upper temperature detection sensor may be mounted on a position above the mounting hole 31 on the inner surface of the inner panel 3 or on a display shelf 5 above the mounting hole 31. In this case, "outside air temperature" in the above description is read as "upper temperature in the product room 4."

Further, in the above-described embodiment, only one mounting hole 31 for the intermediate duct 7 is provided. However, it is not limited to this. Although not shown, a plurality of mounting holes 31 may be provided in the vertical direction, and the intermediate duct 7 may be mounted in any of the mounting holes 31. In this case, the intermediate duct sensor 21 is mounted at a position corresponding to each mounting hole 31, and the control unit 20 determines whether or not the intermediate duct 7 is mounted based on the output signal (detection result) of the intermediate duct sensor 21. At the same time as determining, if it is attached, the attachment position of the intermediate duct 7 is determined. Then, in the control unit 20 that executes the "cooling / cooling mode" or the "heating / cooling mode", the lower the mounting position of the intermediate duct 7, the lower the mounting position of the intermediate duct 7, the lower the second to fourth fans 92b to 92d of the first fan unit 9. The rotation speed of the first to fourth fans 112a to 112d of the second fan unit 11 is increased as well as the rotation speed of the second fan unit 11. In this way, the air volumes of the air (cooling air, weakly cooled air, or heated air) circulating in the third to fifth circulating air passages can be made substantially equal regardless of the mounting position of the intermediate duct 7.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and further modifications and modifications can be made based on the technical idea of the present invention.

1 ... Showcase, 4 ... Product room, 5 ... Display shelf, 6 ... Ventilation duct, 7 ... Intermediate duct, 8 ... 1st heater (upper heater), 9 ... 1st fan unit, 10 ... 2nd heater (upper heater) ), 11 ... 2nd fan unit, 12 ... cooler, 13 ... 3rd heater (lower heater), 20 ... control unit, 21 ... intermediate duct sensor, 22 ... outside temperature sensor, 41 ... upper product room, 42 ... lower Side product room, 61 ... upper duct, 61a ... air outlet, 62 ... lower duct, 62a ... air suction port, 63 ... rear duct, 74 ... first intermediate passage, 77 ... second intermediate passage, 91a ... first fan 1st fan (2nd lower fan) of the unit, 91b to 91d ... 2nd to 4th fans (1st lower fan) of the 1st fan unit, 11a to 11b ... 1st to 4th fans of the 2nd fan unit (1st to 4th fans) Upper fan), 66 ... 1st back passage, 67 ... 2nd back passage, 661 ... upper back passage, 662 ... lower back passage

Claims (10)

A showcase with a product room with an open front
An upper duct provided on the upper side of the product room and having an air outlet on the front side of the product room,
A lower duct provided on the lower side of the product room and having an air suction port on the front side of the product room,
A first back passage provided on the back side of the product room and communicating the inside of the upper duct and the inside of the lower duct, and an upper fan for blowing air in the passage toward the upper duct is arranged on the upper side. The first back passage, which is provided and the cooler and the lower heater are arranged on the lower side,
A second back passage provided on the back side of the product room separately from the first back passage and communicating the inside of the upper duct and the inside of the lower duct,
An intermediate duct that can be attached to and detached from the product room, and when attached to the product room, the product room is divided into an upper product room and a lower product room, and the first back passage is provided by the upper fan. The upper back passage is divided into the arranged upper back passage and the lower back passage in which the cooler and the lower heater are arranged, and one end is opened so as to face the air outlet and the other end is the upper back passage. The intermediate duct having a first intermediate passage that opens inward and a second intermediate passage that opens one end so as to face the air suction port and the other end opens in the lower rear passage.
An upper heater disposed in the upper duct and at least one of the portions constituting the upper back passage in the first back passage.
A first lower fan that blows air in the lower duct toward the first rear passage, and
A second lower fan that blows air in the lower duct toward the second back passage, and
A control unit capable of controlling the upper fan, the cooling operation by the cooler, the lower heater, the upper heater, the first lower fan, and the second lower fan.
Including, showcase. Includes a temperature sensor that detects the outside air temperature or the upper temperature inside the product room.
The control unit
When the intermediate duct is not attached, the upper fan, the cooling operation by the cooler, and the lower part so that the temperature of the product room maintains the preset set temperature based on the detection result of the temperature sensor. Control the heater, the upper heater, the first lower fan and the second lower fan,
When the intermediate duct is attached, the temperature of the upper product chamber maintains the set temperature and the temperature of the lower product chamber is a predetermined temperature lower than the set temperature based on the detection result of the temperature sensor. Control the upper fan, the cooling operation by the cooler, the lower heater, the upper heater, the first lower fan and the second lower fan so as to maintain.
The showcase according to claim 1. The control unit
When the intermediate duct is not attached and the outside air temperature or the upper temperature of the product room is higher than the set temperature, the upper fan, the first lower fan and the second lower fan are continuously operated. At the same time, the cooling operation by the cooler is executed, thereby executing the overall cooling mode for cooling the entire product room.
When the intermediate duct is not attached and the outside air temperature or the upper temperature of the product room is lower than the set temperature, the upper fan, the first lower fan and the second lower fan are continuously operated. At the same time, the lower heater and the upper heater are operated, thereby executing the overall heating mode for heating the entire product room.
The showcase according to claim 2. When the outside air temperature or the upper temperature of the product room becomes lower than the first threshold temperature during the execution of the overall cooling mode, the control unit shifts from the overall cooling mode to the overall heating mode, and the control unit shifts to the overall heating mode. When the outside air temperature or the upper temperature of the product room becomes equal to or higher than the second threshold temperature higher than the first threshold temperature during the execution of the overall heating mode, the mode shifts from the overall heating mode to the overall cooling mode. The showcase according to claim 3. The control unit is
When the intermediate duct is attached and the outside temperature or the upper temperature of the product room is higher than the set temperature, the upper fan and the first lower fan are continuously operated, and the second lower fan is operated. An intermittent operation and a cooling operation by the cooler are executed, thereby executing a cooling / cooling mode in which the upper product room and the lower product room are cooled separately.
When the intermediate duct is attached and the outside temperature or the upper temperature of the product room is lower than the set temperature, the upper fan and the first lower fan are continuously operated, and the cooling operation by the cooler is performed. And operate the upper heater, thereby executing a heating / cooling mode for heating the upper commodity chamber and cooling the lower commodity chamber.
The showcase according to any one of claims 2 to 4. The control unit shifts from the cooling / cooling mode to the heating / cooling mode when the outside temperature or the upper temperature of the product room becomes lower than the first threshold temperature during the execution of the cooling / cooling mode. Then, when the outside temperature or the upper temperature of the product room becomes higher than the second threshold temperature higher than the first threshold temperature during the execution of the heating / cooling mode, the heating / cooling mode is performed. The showcase according to claim 5, wherein the showcase shifts to a cooling / cooling mode. Including an intermediate duct sensor that detects whether or not the intermediate duct is attached,
Based on the detection result of the temperature sensor and the detection result of the intermediate duct sensor, the control unit includes the upper fan, the cooling operation by the cooler, the lower heater, the upper heater, the first lower fan, and the second. Control the lower fan,
The showcase according to claim 2. The control unit
When the intermediate duct is not attached and the outside air temperature or the upper temperature of the product room is higher than the set temperature, the upper fan, the first lower fan and the second lower fan are continuously operated. At the same time, the cooling operation by the cooler is executed, thereby executing the overall cooling mode for cooling the entire product room.
When the intermediate duct is not attached and the outside air temperature or the upper temperature of the product room is lower than the set temperature, the upper fan, the first lower fan and the second lower fan are continuously operated. At the same time, the lower heater and the upper heater are operated, thereby executing the overall heating mode for heating the entire product room.
When the intermediate duct is attached and the outside temperature or the upper temperature of the product room is higher than the set temperature, the upper fan and the first lower fan are continuously operated, and the second lower fan is operated. An intermittent operation and a cooling operation by the cooler are executed, thereby executing a cooling / cooling mode in which the upper product chamber and the lower product chamber are cooled separately.
When the intermediate duct is attached and the outside temperature or the upper temperature of the product room is lower than the set temperature, the upper fan and the first lower fan are continuously operated, and the cooling operation by the cooler is performed. And operate the upper heater, thereby executing a heating / cooling mode for heating the upper product chamber and cooling the lower product chamber.
The showcase according to claim 7. The control unit
When the outside air temperature or the upper temperature of the product room becomes lower than the first threshold temperature during the execution of the overall cooling mode, the overall cooling mode is shifted to the overall heating mode, and the overall cooling mode is executed. When the intermediate duct is installed inside, the mode shifts from the overall cooling mode to the cooling / cooling mode.
When the outside air temperature or the upper temperature of the product room becomes equal to or higher than the second threshold temperature higher than the first threshold temperature during the execution of the overall heating mode, the overall heating mode is changed to the overall cooling mode. If the intermediate duct is attached during the execution of the overall heating mode, the transition is made from the overall heating mode to the heating / cooling mode.
When the outside temperature or the upper temperature of the product room becomes lower than the first threshold temperature during the execution of the cooling / cooling mode, the cooling / cooling mode is shifted to the heating / cooling mode, and the cooling is performed. If the intermediate duct is removed during the execution of the / cooling mode, the cooling / cooling mode is shifted to the overall cooling mode.
When the outside air temperature or the upper temperature of the product room becomes equal to or higher than the second threshold temperature during the execution of the heating / cooling mode, the heating / cooling mode is shifted to the cooling / cooling mode, and the heating is performed. If the intermediate duct is removed during the execution of the heating / cooling mode, the heating / cooling mode shifts to the overall heating mode.
The showcase according to claim 8. The showcase according to any one of claims 1 to 9, wherein the second back passage is arranged on the side of the first back passage.