JP7208049B2 - Showcase - Google Patents

Description

TECHNICAL FIELD The present invention relates to a showcase that can be used as a product room with different temperature zones on the upper and lower sides of the product room.

As an example of this type of showcase, the showcase described in Patent Document 1 forms a cooling air curtain forward by circulating cold air sequentially through the front, bottom, back, ceiling, and front sections. a first air passage, a second air passage that forms a non-cooling air curtain that circulates outside the first air passage and protects the cooling air curtain, and a back portion in the middle of the first air passage. a third air passage for ventilating cooling air to the front portion through the intermediate shelf duct and forming a cooling air curtain in front of the lower side of the intermediate shelf, wherein the third air passage is formed and the first air passage is cut off, the area below the intermediate shelf is divided into a refrigeration temperature zone by the cooling air of the third air passage, and the area above the intermediate shelf is partitioned into a weak cooling temperature zone by the non-cooling air of the second air passage. .

JP 2007-187391 A

However, in the showcase described in Patent Literature 1, there is a possibility that the area above the intermediate shelf cannot be maintained in the slightly cool temperature zone especially when the outside air temperature is low.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a showcase capable of maintaining the upper and lower sides of a product room in respective desired temperature zones regardless of the outside air temperature.

According to one aspect of the present invention, a showcase is provided having a merchandise compartment with an open front. This showcase has an upper duct provided above the product chamber and having an air outlet on the front side of the product chamber, and an air suction port provided on the lower side of the product chamber and on the front side of the product chamber. A lower duct and a first rear passage that is provided on the rear side of the product room and communicates between the inside of the upper duct and the inside of the lower duct, and blows the air in the passage toward the upper duct on the upper side. The first rear passage in which an upper fan is arranged and a cooler and a lower heater are arranged in the lower side, and the upper duct and the A second rear passage that communicates with the inside of the lower duct, and an intermediate duct that is detachable with respect to the merchandise chamber, and which, when attached to the merchandise chamber, divides the merchandise chamber into an upper merchandise chamber and a lower merchandise chamber. and dividing the first rear passage into an upper rear passage in which the upper fan is arranged and a lower rear passage in which the cooler and the lower heater are arranged, and one end of which serves as the air outlet A first internal passage having one end open to face the upper rear passage and the other end opening into the upper rear passage, and a second inner passage having one end opened to face the air suction port and the other end opening into the lower rear passage. an internal passage; an upper heater disposed in at least one of the upper duct and a portion of the first rear passage forming the upper rear passage; A first lower fan that blows air toward the first rear passage, a second lower fan that blows the air in the lower duct toward the second rear passage, the upper fan, and a cooling operation by the cooler; a control unit capable of controlling the lower heater, the upper heater, the first lower fan and the second lower fan.

In the showcase, the control unit is configured to be capable of controlling the upper fan, the cooling operation of the cooler, the lower heater, the upper heater, the first lower fan, and the second lower fan. For this reason, when the intermediate duct is attached, the upper product chamber and the lower product chamber are separately cooled, and an air curtain is formed on the front surface of each of the upper product chamber and the lower product chamber. It is possible to form an air curtain of warm air in front of the heating chamber and an air curtain of cooling air in front of the lower commodity chamber while cooling it. Further, when the intermediate duct is not attached, an air curtain of cooling air is formed in front of the product room while cooling the product room, and an air curtain of warm air is formed in front of the product room while warming the product room. It is possible to form Therefore, according to the showcase, regardless of the outside temperature, the upper side (upper product chamber) and the lower side (lower product chamber) of the intermediate duct are maintained in respective desired temperature zones; The commodity room can be maintained in a desired temperature zone.

1 is a cross-sectional view of a showcase according to one embodiment of the present invention; FIG. FIG. 4 is a view showing the inside of the lower duct and the inside of the rear duct of the showcase as seen from the front side; 4 is an enlarged cross-sectional view of an intermediate duct of the showcase; FIG. 4 is a flow chart showing an example of control executed by a control unit of the showcase; 4 is a flow chart showing an example of control executed by a control unit of the showcase; FIG. 4 is a diagram for explaining air flow when the intermediate duct is not attached in the showcase; FIG. 4 is a diagram for explaining air flow when the intermediate duct is not attached in the showcase; FIG. 5 is a diagram for explaining air flow when the intermediate duct is attached in the showcase; FIG. 5 is a diagram for explaining air flow when the intermediate duct is attached in the showcase;

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

In this 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 clearance 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 includes an upper duct 61 positioned above the product room 4, a lower duct 62 positioned below the product room 4, and a rear side and a lower part of the upper duct 61 positioned on the back side of the product room 4. and a rear duct 63 connecting the rear side of the duct 62 .

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

Attached to the mounting hole 31 is a blocking plate 32 which is constantly biased in a direction to close the mounting hole 31 . The closing plate 32 is configured to open the mounting hole 31 by being pressed by the mounting portion 7a of the intermediate duct 7 inserted into the mounting hole 31 . Although not shown, a plurality of slit-shaped communication holes are formed in the inner panel 3 mainly below the mounting holes 31 to communicate the interior of the product chamber 4 and the interior of the rear duct 63 .

An electric first heater 8 is arranged in the upper duct 61 . In this embodiment, the first heater 8 is attached to a portion forming the upper duct 61 on the inner surface of the case body 2, although not particularly limited. An air outlet 61a opening downward is provided on the front side of the product chamber 4 in the upper duct 61. As shown in FIG.

A first fan unit 9 is arranged in the lower duct 62 to blow the air in the lower duct 62 toward the rear duct 63 . The first fan unit 9 will be described later. Further, an air suction port 62a that opens upward is provided in the lower duct 62 on the front side of the product chamber 4. As shown in FIG. The air inlet 62a is arranged to face the air outlet 61a. The air suction port 62a does not need to strictly face the air blowout port 61a, and may generally face the air blowout port 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 rear duct 63 is directed toward the upper duct 61. A second fan unit 11, a cooler 12, and an electric third heater 13 are provided.

FIG. 2 shows the inside of the lower duct 62 and the inside of the rear duct 63 viewed from the front side. As shown in FIG. 2, a pair of partition plates 64, 64 are provided in the rear duct 63, each extending vertically to partition the rear duct 63 in the horizontal direction. The pair of partition plates 64, 64 are arranged with a gap substantially equal to or slightly smaller than the width of the mounting hole 31 (indicated by an imaginary line (two-dot chain line) in FIG. 2). It extends from the vicinity of the connection with the rear duct 63 to above the mounting hole 31 (here, the position corresponding to the height of the second display shelf 2 from the top) (see FIG. 1).

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

The second fan unit 11 is installed 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 rear duct 63 at a position substantially at the same height as the display shelf 5 on the second stage from the top. In this embodiment, the second fan unit 11 has a fan bracket 111 mounted on the upper surfaces of the pair of partition plates 64, 64, and four electric fans (first to fourth) fans 112a to 112a. 112d are incorporated in the fan bracket 111 at regular intervals in the horizontal 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 portion of the rear duct 63 and between a pair of partition plates 64,64. The cooler 12 is mounted on a support (not shown) so that the air from the lower duct 62 side can pass through. A part of the cooler 12 may be arranged inside the lower duct 62 .

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

A 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 member, and the third heater 13 is attached to the panel member so as to be positioned between the cooler 12 and the panel member. 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 and 64 on the inner surface of the case body 2 and between the attachment hole 31 and the cooler 12 .

Here, the inside of the rear duct 63 can be broadly divided into an upper space S1 located above the pair of partition plates 64 and in which the second heater 10 is arranged, and a space S1 located between the pair of partition plates 64 and 64. In addition, the space S2 between the partition plates in which the second fan unit 11 is arranged in the upper part and the cooler 12 and the third heater 13 are arranged in the lower part. 64, 64), and a right space S4 located on the right side of the inter-partition plate space S2 as viewed from the front side. Further, in the present embodiment, the upper portion of the right space S4 is closed by the closing plate 65. As shown in FIG.

Therefore, in this embodiment, two passages are formed in the rear duct 63 to communicate the inside of the upper duct 61 and the inside of the lower duct 62 . One of the two passages is a passage formed by the upper space S1 and the inter-partition plate space S2, that is, the second heater 10 and the second fan unit 11 are arranged on the upper side, and the cooler is arranged on the lower side. 12 and the third heater 13 (hereinafter referred to as "first rear passage") 66. FIG. 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 the inside of the upper duct 61 and the inside of the lower duct 62 ( 67, which is hereinafter referred to as a "second rear passage". In this embodiment, the second rear passage 67 is arranged to the left of the first rear passage 66 . However, it is not limited to this, and the second rear passage 67 may be arranged on the right side or rear side (rear side) of the first rear passage 66 . A refrigerant pipe 14 and an expander 17 are arranged in the right space S4 whose upper part is closed.

Next, the first fan unit 9 arranged inside 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 of the lower duct 62 in the left-right direction. The first fan unit 9 has a fan duct 91 extending in the left-right direction and having an opening on the back side of the product chamber 4. Four electric fans (first to fourth fans) 92a to 92d are connected to the fan duct It is mounted on the upper surface of the , leaving a space in the left and 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 it through the fan duct 91, and blows it toward the rear duct 63. is configured to Here, as indicated by the dashed 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 flows into the left space S3 of the rear duct 63 (that is, the left space S3). A guide plate 911 is provided in the fan duct 91 for guiding toward the rear passage 67).

Therefore, as indicated by arrows in FIG. 2, the first fan unit 9 moves the air in the lower duct 62 to the second direction by the operation of the leftmost first fan 92a among the first to fourth fans 92a to 92d. The air in the lower duct 62 is blown toward the rear passage 67 (left space S3), and the remaining second to fourth fans 92b to 92d operate to direct the air in the lower duct 62 toward the first rear passage 66 (the space S2 between the partition plates). to blow air. As in the case of the second fan unit 11, the first fan unit 9 includes at least one fan that blows the air in the lower duct 62 toward the second rear passage 67 and the air in the lower duct 62. and at least one fan that blows air toward the first rear passage 66 .

Next, the intermediate duct 7 will be explained.
In this embodiment, the mounting portion 7a of the intermediate duct 7 has a width dimension approximately equal to the distance between the pair of partition plates 64, 64 and a depth dimension approximately equal to that of the rear duct 63. As shown in FIG. Further, the main body portion 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. As shown in FIG. Therefore, when the intermediate duct 7 is attached to the product chamber 4 , the inter-partition plate space S<b>2 is divided into an upper side and a lower side by the mounting portion 7 a of the intermediate duct 7 . Furthermore, the first rear passage 66 is provided with an upper rear passage 661 in which the second heater 10 and the second fan unit 11 are arranged, the cooler 12 and the third heater 13 by means of the mounting portion 7a of the intermediate duct 7. A lower rear passageway 662 is provided (see FIG. 1). When the intermediate duct 7 is attached to the product chamber 4, the product chamber 4 is divided into an upper product chamber 41 and a lower product chamber 42 by the body portion 7b of the intermediate duct 7 (see FIG. 1).

3 is an enlarged sectional view of the intermediate duct 7. FIG.
As shown in FIGS. 1 and 3, the interior of the intermediate duct 7 is divided vertically by a heat insulating member 71 . A first inlet 72 is formed near the end of the upper surface of the main body 7b opposite to the mounting portion 7a and faces the air outlet 61a when the intermediate duct 7 is attached to the product chamber 4. A first lead-out port 73 that opens into the upper rear passage 661 when the intermediate duct 7 is attached to the product chamber 4 is formed in the vicinity of the end on the upper surface of the mounting portion 7a opposite to the main body portion 7b. ing. Accordingly, a passage (hereinafter referred to as “first intermediate passage”) 74 is formed in the intermediate duct 7 from the first inlet 72 to the first outlet 73 via the upper space of the heat insulating member 71 . In other words, the intermediate duct 7 has one end opened as a first inlet 72 facing the air outlet 61 a when the intermediate duct 7 is attached to the product chamber 4 and the other end extending into the upper rear passage 661 . It has a first intermediate passage 74 that opens as one outlet 73 . It should be noted that the first inlet 72 need not strictly face the air outlet 61a, and may generally face the air outlet 61a.

A second outlet 75 is formed near the end of the lower surface of the body portion 7b opposite to the mounting portion 7a and faces the air suction port 62a when the intermediate duct 7 is attached to the product chamber 4. A second inlet 76 that opens into the lower rear passage 662 when the intermediate duct 7 is attached to the product chamber 4 is formed near the end on the lower surface of the 7a opposite to the main body 7b. Therefore, a passage (hereinafter referred to as a “second intermediate passage”) 77 is formed in the intermediate duct 7 from the second inlet 76 to the second outlet 75 via the lower space of the heat insulating member 71 . In other words, the intermediate duct 7 has one end that opens as a second outlet 75 facing the air suction port 62a when the intermediate duct 7 is attached to the product chamber 4, and the other end that extends into the lower rear passage 662. A second intermediate passage 77 opening as a second inlet 76 is provided below the first intermediate passage 74 . The second outlet 75 need not strictly face the air suction port 62a, and may generally face the air suction port 62a.

Returning to FIG. 1, an intermediate duct sensor 21 for detecting the presence or absence of the intermediate duct 7 (that is, whether or not the intermediate duct 7 is attached to the product chamber 4) is provided in the product chamber 4 or the rear duct 63. there is In this embodiment, the intermediate duct sensor 21 is attached near the mounting hole 31 in the rear duct 63, for example, at a position corresponding to the mounting hole 31 on the inner surface of the case body 2. output a signal. Although not particularly limited, by the magnetic force of a push switch operated 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 A working reed switch can be used as the mid-duct sensor 21 .

Further, the showcase 1 is provided with an outside air temperature sensor 22 for detecting outside air temperature. In this 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 corresponding to the outside air temperature. However, it is not limited to this, and the outside air temperature sensor 22 can be installed at any place in the showcase 1 .

Operations of the showcase 1 are mainly controlled by a control unit 20 installed on the upper surface of the case body 2 . In this embodiment, when the intermediate duct 7 is not attached, that is, when the product room 4 is not divided into the upper product room 41 and the lower product room 42, the control unit 20 controls the product room 4 ( The operation of the showcase 1 is controlled so that the temperature of the whole) is maintained at a set temperature TS (for example, 18 to 22° C.) suitable for boxed lunches and side dishes. Further, when the intermediate duct 7 is attached, that is, when the product chamber 4 is divided into the upper product chamber 41 and the lower product chamber 42, the control unit 20 determines that the temperature of the upper product chamber 41 is The setting temperature TS is maintained, and the temperature of the lower product chamber 42 is shown to maintain a predetermined temperature lower than the set temperature TS, for example, a refrigeration temperature or chilled temperature (hereinafter referred to as "refrigeration temperature, etc.") of 0 to 10°C. Controls the operation of Case 1.

Specifically, in the present embodiment, the control unit 20 controls the first heater 8, first fan The cooling operation by 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 cooler 12, and the third heater 13 are controlled. Regarding the cooling operation by the cooler 12, the control unit 20 mainly operates or stops the compressor constituting the condensing unit 16 to perform the cooling operation by the cooler 12. Alternatively, the cooling operation by the cooler 12 is stopped.

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

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

In step S2, the "whole 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, Execute the cooling operation by In addition, 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 62 a , passes through the lower duct 62 and is led to the first rear passage 66 and the second rear passage 67 in the rear duct 63 . The air guided to the first rear passage 66 is cooled by the cooler 12 and introduced into the upper duct 61, passes through the upper duct 61, and is blown out from the air outlet 61a toward the air inlet 62a of the lower duct 62. be done. Also, the air guided to the second rear passage 67 is also introduced to the upper duct 61 .

Therefore, as indicated by white arrows in FIG. 6, the cooling air flows through the first rear passage 66, the upper duct 61, the front surface of the product chamber 4 (between the air outlet 61a and the air inlet 62a) and the lower portion. It circulates through the duct 62 in order. As a result, the product room 4 is cooled, and an air curtain of cooling air is formed in front of the product room 4 . In other words, the cooling air is circulated to form a first circulation air passage in which an air curtain of the cooling air is formed in front of the commodity chamber 4 . In addition, as indicated by the dashed arrows in FIG. 6, the air passing through the second rear passage 67 is also introduced into the upper duct 61 and mixed with the cooling air circulating through 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 "whole cooling mode" controls 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. Control of the fans 112a-112d may vary. For example, the control unit 20 that executes the "total cooling mode" increases the flow rate of air passing through the first rear passage 66 (that is, the flow rate of cooling air circulating through the first circulation air passage) as the outside air temperature increases. do more The control unit 20 that executes the "whole cooling mode" increases the rotational 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, it is possible to increase the flow rate of the cooling air circulating through the first circulation air passage. In this way, when the outside air temperature is high, an air curtain of cooling air can be reliably formed in front of the product room 4, and the temperature of the product room 4 can be more accurately maintained at the set temperature TS.

In addition, the control unit 20 that executes the "whole cooling mode" increases or decreases the number of rotations of the first fan 91a of the first fan unit 9 according to the outside air temperature, thereby circulating through the first circulation air passage. The temperature of the cooling air circulating in the first circulation air passage by adjusting the flow rate of the air that has passed through the second rear passage 67 (that is, the flow rate of the air that bypassed the cooler 12), which is mixed with the cooling air, As a result, it is also possible to finely adjust the temperature of the product room 4 .

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

In step S<b>4 , the outside temperature is detected based on the output signal (detection result) of the outside temperature sensor 22 .

In step S5, it is determined whether or not the outside air temperature detected in step S4 is lower 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, if the outside air temperature is less than the first threshold temperature Tth1 (step S5: YES), that is, if the outside air temperature becomes less than the first threshold temperature Tth1 during execution of the "whole cooling mode", step S6 proceed to In the present embodiment, the first threshold temperature Tth1 is set to the lower limit (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 "whole heating mode" for heating the entire product room 4 is executed (the "whole cooling mode" is shifted to the "whole 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 controls the first heater. 8. The second heater 10 and the third heater 13 are operated. Also, 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 62 a , passes through the lower duct 62 and is led to the first rear passage 66 and the second rear passage 67 in the rear duct 63 . The air guided to the first rear passage 66 is heated by the third heater 13 and the second heater 10, introduced into the upper duct 61, further heated by the first heater 8 in the upper duct 61, and then blown. The air is blown out from the outlet 61 a toward the air suction port 62 a of the lower duct 62 . Also, the air guided to the second rear passage 67 is also introduced to the upper duct 61 .

Therefore, as indicated by black arrows in FIG. 7, the heated air flows through the first rear passage 66, the upper duct 61, and the front surface of the product chamber 4 (between the air outlet 61a and the air inlet 62a). and the lower duct 62 in that order. As a result, the product room 4 is heated and an air curtain is formed in front of the product room 4 by the heated air. In other words, the heated air is circulated to form a second circulation air passage in which an air curtain of the heated air is formed in front of the commodity chamber 4 . 7, the air passing through the second rear passage 67 is also introduced into the upper duct 61 and mixed with the heated air circulating in the second circulation air passage, and the first heater 8 warmed. Therefore, even when the outside air temperature is low, the temperature of the entire merchandise room 4 can be uniformly maintained at the set temperature TS.

Here, the control unit 20 that executes the "whole 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, when the difference between the set temperature TS and the outside air temperature is equal to or greater than the first predetermined value, the control unit 20 that executes the "total heating mode" controls 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 In this way, the temperature of the product room 4 can be more accurately maintained at the set temperature TS when the outside air temperature is low.

In addition, the control unit 20 that executes the "whole heating mode" controls 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. Control of the fans 112a-112d may vary. For example, the control unit 20 that executes the "overall heating mode" increases the flow rate of air passing through the first rear passage 66 (that is, the flow rate of heated air circulating in the first circulation air passage) as the outside air temperature decreases. ). The control unit 20 that executes the "whole heating mode" controls the rotational 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 it, it is possible to increase the flow rate of the heated air circulating through the first circulation air passage. In this way, when the outside air temperature is low, an air curtain of heated air can be reliably formed in front of the product room 4, and the temperature of the product room 4 can be more accurately maintained at the set temperature TS.

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

A 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, if the intermediate duct 7 is attached (step S7: YES), i.e., if the intermediate duct 7 is attached during execution of the above-mentioned "entire heating mode", the process proceeds to step S14, and the process proceeds to step S14. "warming/cooling mode" (transition from the overall warming mode to the "warming/cooling mode").

In step S<b>8 , the outside temperature is detected based on the output signal (detection result) of the outside 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 a second threshold temperature Tth2 higher than the first threshold temperature Tth1. When the outside air temperature is lower than the second threshold temperature Tth2 (step S9: NO), the "overall heating mode" is continued. On the other hand, if the outside air temperature is equal to or higher than the second threshold temperature Tth2 (step S9: YES), that is, if the outside air temperature becomes equal to or higher than the second threshold temperature Tth2 during execution of the "whole heating mode", step Proceeding to S2, the "whole cooling mode" is executed (shift from the "whole heating mode" to the "whole cooling mode"). In this 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 any temperature higher than the first threshold temperature Tth1, and can be arbitrarily set according to the set temperature TS and the size (volume) of the commodity room 4 and the like.

In step S10, a "cooling/cooling mode" is executed to cool the upper product chamber 41 and the lower product chamber 42 separately. Specifically, the control unit 20 causes the first fan 92a of the first fan unit 9 to operate intermittently, the second to fourth fans 92b to 92d of the first fan unit 9, and the first to fourth fans 92b to 92d of the second fan unit 11. The fourth fans 112a to 112d are continuously operated, and the cooling operation by the cooler 12 is performed. In addition, 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 rear passage 662 and the second rear passage 67. be introduced. The air introduced into the lower rear passage 662 is cooled by the cooler 12, introduced from the second inlet 76 of the intermediate duct 7 into the second intermediate passage 77 of the intermediate duct 7, and passed through the second intermediate passage 77. The air 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 rear passage 67 passes through the second rear passage 67 and is introduced into the upper duct 61 .

For this reason, as indicated by white arrows in FIG. air inlet 62a) and inside the lower duct 62 in that order. That is, the cooling air is circulated to form the third circulation air passage in which an air curtain of the cooling air is formed in front of the lower commodity chamber 42 . Therefore, even when the outside air temperature is high, the temperature of the lower product compartment 42 can be maintained at the refrigeration temperature or the like.

Here, the control unit 20 executing the "cooling/cooling mode" may change 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 "cooling/cooling mode" increases the flow rate of air passing through the lower rear passage 662 (that is, the cooling air that circulates through the third circulation air passage) as the outside air temperature increases. do. The control unit 20 that executes the "cooling/cooling mode" increases the rotation speed of at least one of the second to fourth fans 92b to 92d of the first fan unit 9 to circulate in the third circulation air passage. The flow rate of cooling air can be increased. In this way, when the outside air temperature is high, an air curtain of cooling air can be reliably formed in front of the lower commodity chamber 42, and the temperature of the lower commodity chamber 42 can be more accurately maintained at a refrigeration temperature or the like. obtain.

Above the intermediate duct 7, air is introduced from the first inlet 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 and enters the first guide. It is drawn out from the outlet 73 into the upper rear passage 661 . Air drawn into the upper rear passage 661 is introduced into the upper duct 61 . In addition, the air that has passed through the second rear passage 67 is also introduced into the upper duct 61 . The air introduced into the upper duct 61 passes through the inside of the upper duct 61 and is blown out from the air outlet 61 a toward the first inlet 72 of the intermediate duct 7 . Here, the air that passes through the upper rear passage 661 and is introduced into the upper duct 61 is uncooled air (non-cooled air), and the air that passes through the second rear passage 67 and is introduced into the upper duct 61 contains the air sucked into the lower duct 62 from the air suction port 62a, that is, the cooling air circulating through the third circulation air passage. Therefore, a mixture of non-cooled air and cooled air is blown out from the air outlet 61 a toward the first inlet 72 of the intermediate duct 7 . The blown mixture is cooler than the uncooled air and hotter than the cooled air.

Therefore, as indicated by hatched arrows in FIG. 8, the air-fuel mixture (weak cooling air) flows into the upper duct 61 and in front of the upper product chamber 41 (between the air outlet 61a and the first inlet 72). , the first intermediate passage 74 of the intermediate duct 7 and the upper rear passage 661 in that order. As a result, the upper product chamber 41 is cooled (weakly cooled), and an air curtain is formed in front of the upper product chamber 41 by the mixture (weak cooling air). In other words, a fourth circulation air passage is formed in which the weak cooling air circulates and forms an air curtain of the weak cooling air on the front surface of the upper product chamber 41 . Therefore, even when the outside air temperature is high, the temperature of the upper product compartment 41 can be maintained at the set temperature TS.

Here, the control unit 20 that executes the "cooling/cooling mode" may adjust the proportion of 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 increases. The control unit 20 that executes the "cooling/cooling mode" is controlled by shortening the shut-down time (increasing the operating time) of the first fan 9a of the first fan unit 9 and/or the first fan of the second fan unit 11. The proportion of cooling air in the air-fuel mixture can be increased by reducing or stopping the rotation speed of at least one of the fourth fans 112a to 112d. In this way, the cooling capacity of the air-fuel mixture is adjusted, so that the temperature of the upper commodity chamber 41 can be maintained at the set temperature TS with higher accuracy.

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

In step S<b>12 , 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 lower 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, if the outside air temperature is less than the first threshold temperature Tth1 (step S13: YES), that is, if the outside air temperature becomes less than the first threshold temperature Tth1 during execution of the "cooling/cooling mode", step Proceed to S14.

In step S14, the "heating/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 so that the cooler 12 A cooling operation is performed and the first heater 8 and the second heater 10 are operated. Also, the control unit 20 stops the first fan 92a and the third heater 13 of the first fan unit 9 .

Then, above the intermediate duct 7, air is introduced from the first inlet 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 drawn out into the upper rear passage 661 through the first outlet 73 . The air led out into the upper rear 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 discharged from the air outlet 61a into the intermediate duct. It is blown out toward the first inlet 72 of 7.

For this reason, as indicated by black arrows in FIG. , the first intermediate passage 74 and the upper rear passage 661 in this order. As a result, the upper product chamber 41 is heated and an air curtain is formed on the front surface of the upper product chamber 41 by the heated air. In other words, the heated air is circulated to form a fifth circulation air passage in which an air curtain of the heated air is formed in front of the upper commodity chamber 41 . Therefore, even when the outside air temperature is low, the temperature of the upper product compartment 41 can be maintained at the set temperature TS.

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 a 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 intermittent operation. In this way, the temperature of the upper product compartment 41 can be more accurately maintained at the set temperature TS when the outside air temperature is low.

Further, the control unit 20 executing 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" increases the flow rate of the air passing through the upper rear passage 661 (that is, the heated air that circulates through the fourth circulation air passage) as the outside air temperature decreases. do more The control unit 20 can increase the flow rate of the heated air circulating through the fifth circulation air passage by increasing the rotational speeds of the first to fourth fans 112a to 112d of the second fan unit 11. FIG. In this way, when the outside air temperature is low, an air curtain of heated air can be reliably formed in front 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 through the air suction port 62 a , and the sucked air passes through the lower duct 62 and is introduced into the lower rear passage 662 . The air introduced into the lower rear passage 662 is cooled by the cooler 12, introduced from the second inlet 76 of the intermediate duct 7 into the second intermediate passage 77 of the intermediate duct 7, and passed through the second intermediate passage 77. The air is blown out from the second outlet 75 of the intermediate duct 7 toward the air suction port 62a.

For this reason, as indicated by white arrows in FIG. air inlet 62a) and the lower duct 62 in that order. That is, the cooling air is circulated to form the third circulation air passage in which the cooling air forms an air curtain in front of the lower commodity chamber 42, and the temperature of the lower commodity chamber 42 can be maintained at a refrigeration temperature or the like.

Here, the control unit 20 that executes the "heating/cooling mode" may change 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 "warming/cooling mode" increases the flow rate of the air passing through the lower rear passage 662 (that is, the cooling air that circulates through the fifth circulation air passage) as the outside air temperature decreases. Reduce. The control unit 20 reduces or stops the rotation speed of at least one of the second to fourth fans 92b to 92d of the first fan unit 9, thereby reducing the flow rate of the cooling air circulating through the fifth circulation air passage. can be done. In this way, power consumption can be reduced while maintaining the temperature of the lower product compartment 42 at a refrigeration temperature or the like.

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

In step S<b>16 , the outside temperature is detected based on the output signal (detection result) of the outside 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 lower than the second threshold temperature Tth2 (step S17: NO), the "warming/cooling mode" is continued. On the other hand, if the outside air temperature is equal to or higher than the second threshold temperature Tth2 (step S17: YES), that is, if the outside air temperature becomes equal to or higher than the second threshold temperature Tth2 during execution of the "heating/cooling mode" Proceeding to step S10, the "cooling/cooling mode" is executed (shifting from the "heating/cooling mode" to the "cooling/cooling mode").

As described above, in this embodiment, the control unit 20 controls the above-mentioned "overall cooling mode", the above-mentioned " Any one of the "overall heating mode", the "cooling/cooling mode", and the "warming/cooling mode" is selectively executed. 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 interior of the commodity chamber 4 is automatically maintained at an optimum temperature state according to the presence/absence of the intermediate duct 7. be done. In addition, temperature anomalies in the product compartment 4 due to erroneous switch operation or the like are prevented.

In the showcase 1 according to this embodiment, the first to fourth fans 112a to 112d of the second fan unit 11 correspond to the "upper fan" of the invention, and the third heater 13 corresponds to the "lower heater" of the 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. , and 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 attaching or detaching the intermediate duct 7 .

In the above-described embodiment, the control unit 20 controls the operation of the first heater 8 and the first fan unit 9 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. The cooling operation by the fans 92a to 92d, the second heater 10, the fans 112a to 112d of the second fan unit 11, 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, an output signal (detection result) of an 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 detecting the upper temperature in the product room 4 substantially detects the outside air temperature. Since the upper temperature detection sensor is arranged in the product compartment 4, it is less susceptible to external air currents than the outside air temperature sensor 22, and has the advantage of enabling stable temperature control. The upper temperature detection sensor is arranged above the mounting hole 31 in the commodity chamber 4 . For example, the upper temperature detection sensor can be attached to a position above the attachment hole 31 on the inner surface of the inner panel 3 or to the display shelf 5 above the attachment hole 31 . In this case, the "outside air temperature" in the above description can be read as the "upper temperature in the product room 4".

Further, only one mounting hole 31 for the intermediate duct 7 is provided in the above-described embodiment. However, it is not limited to this. Although illustration is omitted, a plurality of attachment holes 31 may be provided in the vertical direction, and the intermediate duct 7 may be attached to one of the attachment holes 31 . In this case, the intermediate duct sensor 21 is attached at a position corresponding to each attachment hole 31, and the control unit 20 determines whether the intermediate duct 7 is attached based on the output signal (detection result) of the intermediate duct sensor 21. When the determination is made and the intermediate duct 7 is attached, the attachment position of the intermediate duct 7 is determined. The control unit 20 that executes the "cooling/cooling mode" or the "heating/cooling mode" increases the second to fourth fans 92b to 92d of the first fan unit 9 as the mounting position of the intermediate duct 7 is lower. is decreased, and the rotation speeds of the first to fourth fans 112a to 112d of the second fan unit 11 are increased. In this way, regardless of the mounting position of the intermediate duct 7, the volume of air (cooling air, weak cooling air, or heating air) circulating in the third to fifth circulation air passages can be substantially equalized.

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 changes are possible based on the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1... Showcase, 4... Merchandise room, 5... Display shelf, 6... Ventilation duct, 7... Intermediate duct, 8... First heater (upper heater), 9... First fan unit, 10... Second heater (upper heater ), 11...Second fan unit, 12...Cooler, 13...Third heater (lower heater), 20...Control unit, 21...Intermediate duct sensor, 22...Outside air temperature sensor, 41...Upper product compartment, 42...Lower Side product compartment 61 Upper duct 61a Air outlet 62 Lower duct 62a Air inlet 63 Rear duct 74 First intermediate passage 77 Second intermediate passage 91a First fan First fan of unit (second lower fan), 91b to 91d... Second to fourth fan of first fan unit (first lower fan), 11a to 11b... First to fourth fan of second fan unit ( Upper fan), 66... First rear passage, 67... Second rear passage, 661... Upper rear passage, 662... Lower rear passage

Claims (10)

A showcase having a product room with an open front,
an upper duct provided above the product chamber and having an air outlet on the front side of the product chamber;
a lower duct provided on the lower side of the product chamber and having an air suction port on the front side of the product chamber;
A first rear passage provided on the rear side of the product room and communicating between the inside of the upper duct and the inside of the lower duct, wherein an upper fan for blowing air in the passage toward the upper duct is arranged on the upper side. the first rear passage provided and having a cooler and a lower heater disposed on the lower side;
a second rear passage provided separately from the first rear passage on the rear side of the product chamber and communicating between the inside of the upper duct and the inside of the lower duct;
An intermediate duct that is detachable from the merchandise chamber, and which, when attached to the merchandise chamber, divides the merchandise chamber into an upper merchandise chamber and a lower merchandise chamber, and moves the first rear passage through the upper fan. divided into an upper rear passage and a lower rear passage in which the cooler and the lower heater are arranged, one end of which is open to face the air outlet and the other end of which is the upper rear passage the intermediate duct having a first intermediate passage opening inward and a second intermediate passage having one end opening facing the air suction port and the other end opening into the lower rear passage;
an upper heater disposed in at least one of the upper duct and a portion forming the upper rear passage in the first rear passage;
a first lower fan that blows air in the lower duct toward the first rear passage;
a second lower fan that blows the air in the lower duct toward the second rear passage;
a control unit capable of controlling the upper fan, cooling operation by the cooler, the lower heater, the upper heater, the first lower fan and the second lower fan;
Showcase, including. including a temperature sensor that detects the outside temperature or the upper temperature in the product room,
The control unit is
When the intermediate duct is not attached, the upper fan, the cooler, and the lower part are operated to maintain the temperature of the product room at a preset temperature based on the detection result of the temperature sensor. controlling 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 compartment maintains the set temperature and the temperature of the lower product compartment reaches a predetermined temperature lower than the set temperature based on the detection result of the temperature sensor. controlling the upper fan, cooling operation by the cooler, the lower heater, the upper heater, the first lower fan and the second lower fan to maintain
The showcase according to claim 1. The control unit is
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 operated continuously. and performing a cooling operation by the cooler, thereby performing an 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 operated continuously. and operating the lower heater and the upper heater together, thereby executing an overall heating mode for heating the entire product room.
The showcase according to claim 2. The control unit shifts from the general cooling mode to the general heating mode when the outside air temperature or the upper temperature of the product room becomes less than a first threshold temperature during execution of the general cooling mode, and When the outside air temperature or the upper temperature of the product room becomes equal to or higher than a second threshold temperature higher than the first threshold temperature during execution of the overall heating mode, the overall heating mode is shifted to the overall cooling mode. 4. The showcase of claim 3, wherein The control unit is
When the intermediate duct is attached and the outside air temperature or the upper temperature of the product room is higher than the set temperature, the upper fan and the first lower fan are operated continuously, and the second lower fan is operated. performing intermittent operation and cooling operation by the cooler, thereby performing a cooling/cooling mode in which the upper product compartment and the lower product compartment are separately cooled;
When the intermediate duct is attached and the outside air 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 to perform a cooling operation by the cooler. and operating the upper heater, thereby performing a heating/cooling mode that warms the upper merchandise compartment and cools the lower merchandise compartment;
The showcase according to any one of claims 2-4. The control unit transitions from the cooling/cooling mode to the heating/cooling mode when the outside air temperature or the upper temperature of the product room becomes less than a first threshold temperature during execution of the cooling/cooling mode. and when the outside air temperature or the upper temperature of the product room becomes equal to or higher than a second threshold temperature higher than the first threshold temperature during execution of the heating/cooling mode, the heating/cooling mode is switched to the 6. The showcase of claim 5, transitioning to cooling/chilling mode. including an intermediate duct sensor that detects whether the intermediate duct is attached;
The control unit controls cooling operations by the upper fan and the cooler, the lower heater, the upper heater, the first lower fan and the second fan based on the detection result of the temperature sensor and the detection result of the intermediate duct sensor. to control the bottom fan,
The showcase according to claim 2. The control unit is
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 operated continuously. and performing a cooling operation by the cooler, thereby performing an 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 operated continuously. and operating the lower heater and the upper heater, thereby performing an overall heating mode for heating the entire product room,
When the intermediate duct is attached and the outside air temperature or the upper temperature of the product room is higher than the set temperature, the upper fan and the first lower fan are operated continuously, and the second lower fan is operated. intermittent operation and cooling operation by the cooler, thereby performing a cooling/cooling mode in which the upper product compartment and the lower product compartment are separately cooled;
When the intermediate duct is attached and the outside air 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 to perform a cooling operation by the cooler. and operating the upper heater, thereby performing a heating/cooling mode that warms the upper merchandise compartment and cools the lower merchandise compartment;
The showcase according to claim 7. The control unit is
When the outside air temperature or the upper temperature of the product room becomes less than a first threshold temperature during execution of the general cooling mode, the general cooling mode is shifted to the general heating mode, and the general cooling mode is executed. When the intermediate duct is installed inside, the overall cooling mode is shifted to the cooling/cooling mode,
When the outside air temperature or the upper temperature of the product room becomes equal to or higher than a second threshold temperature higher than the first threshold temperature during execution of the overall heating mode, the overall heating mode is switched to the overall cooling mode. transitioning from the overall heating mode to the heating/cooling mode when the intermediate duct is attached during execution of the overall heating mode;
When the outside air temperature or the upper temperature of the product room becomes less than the first threshold temperature during execution of the cooling/cooling mode, the cooling/cooling mode is shifted to the heating/cooling mode, and the cooling is performed. / transitioning from the cooling/cooling mode to the overall cooling mode when the intermediate duct is removed during execution of the cooling mode;
When the outside air temperature or the upper temperature of the product room reaches or exceeds a second threshold temperature during execution of the heating/cooling mode, the heating/cooling mode is shifted to the cooling/cooling mode, and the heating/cooling mode is switched to the cooling/cooling mode. When the intermediate duct is removed during execution of the heating/cooling mode, the heating/cooling mode is shifted to the overall heating mode.
A showcase according to claim 8. The showcase according to any one of claims 1 to 9, wherein said second rear passage is arranged laterally of said first rear passage.

Images