JP5914801B2 - Open showcase - Google Patents

Description

  The present invention relates to an open showcase that includes an intermediate duct member that vertically divides the inside of a heat insulating wall that opens to the front, and that can be used at different temperatures in a display chamber positioned above and below the intermediate duct member.

  Conventionally, open showcases installed in supermarkets and convenience stores have a cold air duct between the inside of the heat insulating wall that opens to the front and a partition plate that is spaced from the inside. A display room is configured, and a cooler and a blower are installed in the cool air duct. Further, a cold air discharge port is formed at the upper edge of the opening of the display chamber, and a cold air suction port is formed at the lower edge of the opening in communication with the cold air duct. When the blower is operated, the cold air exchanged with the cooler is discharged from the cold air discharge port at the upper edge of the opening, and is sucked into the cold air duct from the cold air suction port at the lower edge of the opening. Thus, a cool air curtain is formed in the opening, and cool air is circulated and cooled in the display room.

  Further, a plurality of shelves are installed in the display room, and an intermediate duct member having an intermediate duct communicating with the cold air duct is attached to each shelf or a specific shelf. There are also things. In this case, a damper member is attached to the upper side of the intermediate duct member or the rear end of the intermediate duct member.

  When the display room is used as two different temperature zones, for example, normal temperature and refrigeration temperature (cooling), or refrigeration temperature and lower chilled temperature (both cooling), the shelf compartment that divides the temperature zone is used. The upper damper member is advanced into the cold air duct on the back to close it. Thereby, the cold air that has passed through the cooler that rises the cold air duct on the back surface is guided by the damper member into the intermediate duct formed inside the intermediate duct member, and cools the display chamber below the intermediate duct member. On the other hand, since the cold air that has passed through the cooler is not supplied by the damper member to the upper side of the shelf to which the intermediate duct member is attached, the display room above the shelf is set to a higher temperature zone than the lower display room such as room temperature. It was possible to use (for example, refer patent document 1).

JP 2009-72282 A

  Here, the display room above the shelf to which the intermediate duct member is attached is used to display lunch boxes or the like at room temperature, but the temperature around the open showcase in the store rises in summer or the like (for example, +27 When the temperature is about 20 ° C. (20 ± 2 ° C.), the temperature is higher than that suitable for lunch boxes. On the other hand, in the open showcase, even if the cool air duct on the back side is closed by the damper member, the heat that is transmitted through the slight gaps and metal members in various places causes the display room above the shelf to which the intermediate duct member is attached, The cold air duct is cooled by the lower display chamber and the cold air duct.

  Therefore, a blower is installed in the cold air duct above the damper member, and when the temperature rises, the air in the cold air duct (air cooled by the cooling action from the lower display chamber and the cold air duct) is discharged. It is considered that the temperature in the upper display chamber can be lowered to a temperature suitable for a lunch box or the like by discharging from the outlet and sucking from the back on the upper side of the shelf to which the intermediate duct member is attached.

  However, since the temperature around the open showcase also drops to about + 18 ° C. in winter, for example, even if the blower is stopped, the lower part of the upper display room is affected by the cooling action from the lower display room and the cold air duct. It becomes too cold, and the temperature becomes unsuitable for display such as lunch. Further, if an electric heater or the like for compensating the temperature in the upper display room is provided to solve this problem, there is a problem that this time the power consumption increases and the result is contrary to energy saving.

  The present invention has been made in order to solve the conventional technical problems, and is an open showcase in which upper and lower display chambers are formed in a heat insulating wall opened on the front surface, and can be used at two temperatures of normal temperature and cooling. The purpose of the present invention is to eliminate overcooling of the display room used at room temperature without using an electric heater or the like.

  In order to solve the above-mentioned problems, an open showcase of the present invention forms an upper display chamber and a lower display chamber by dividing the inside of a heat insulating wall opened on the front surface by an intermediate duct member. By circulating the cool air heat exchanged with the cooler through the lower back duct and the intermediate duct in the intermediate duct member in the display room, the cool air air curtain is formed in the front opening of the lower display room and the lower display room is The upper display chamber is cooled and used at a temperature different from that of the lower display chamber. The upper rear duct is located behind the upper display chamber and above the lower rear duct. A ceiling duct configured to communicate with the duct and above the upper display room; formed on the upper edge of the front opening of the upper display room; formed on the upper ventilation port communicating with the ceiling duct; and formed on the lower back of the upper display room; Lower draft communicating with upper and lower ducts And a blower that forms an air circulation between the upper display chamber, the upper back duct, and the ceiling duct, and a control device that controls the operation of the blower. Air is discharged from the upper vent through the ceiling duct and sucked from the lower vent, and the air is sucked from the upper duct and discharged from the lower vent through the ceiling duct and upper rear duct. The second operating state is executed.

  The open showcase of the invention of claim 2 includes an upper temperature sensor for detecting the temperature in the upper display chamber in the above, and the control device detects that the temperature in the upper display chamber detected by the upper temperature sensor is equal to or higher than a predetermined upper limit temperature. In this case, the air blower is controlled to the first operation state, and when the temperature in the upper display chamber becomes a predetermined lower limit temperature or less, the air blower is controlled to the second operation state.

  In the open showcase of the invention of claim 3, in each of the above inventions, the blower device includes a first blower for executing the first operation state, and a second blower for executing the second operation state. It is comprised from these.

  The open showcase according to a fourth aspect of the invention is characterized in that, in the above invention, the blower is attached to a grill formed on a mounting plate that closes the upper and lower ducts, and the first and second blowers are superposed. And

  The open showcase of the invention of claim 5 is characterized in that, in the invention of claim 1 or claim 2, the blower device is constituted by a single blower capable of rotating forward and backward.

  An open showcase according to a sixth aspect of the present invention includes a series of rear ducts extending from the lower display chamber to the upper display chamber in each of the above inventions, and the intermediate duct member is attached to the display chamber so that the position can be changed. Corresponding to each mounting position of the member, a damper member that closes the back duct so as to be openable and closable is provided, and this damper member forms an upper back duct and a lower back duct by closing the back duct, The cool air is guided from the lower back duct to the intermediate duct.

  The open showcase of the invention of claim 7 is characterized in that, in the above invention, the lower ventilation port and the air blower are arranged above a range in which the attachment position of the intermediate duct member can be changed.

  According to the present invention, the upper display chamber and the lower display chamber are formed by dividing the inside of the heat insulating wall opened to the front by the intermediate duct member, and the lower rear duct and the intermediate duct member are formed in the lower display chamber. By circulating the cool air exchanged with the cooler through the intermediate duct inside, the lower display room is cooled while forming a cool air curtain at the front opening of the lower display room, and the upper display room is In an open showcase that is used at a temperature different from that of the room, it is located behind the upper display room, above the lower back duct, and above the upper display room in communication with the upper back duct. A ceiling duct formed on the front opening of the upper display room and communicated with the ceiling duct; a lower vent formed at the lower back of the upper display room and communicated with the upper rear duct; , Upper display room, upper back duck And an air blower that forms an air circulation between the ceiling duct and a control device that controls the operation of the air blower, so that the lower display room is cooled to a temperature such as refrigeration or chilled while the upper display room Can be made into a two-temperature state in which the upper limit is used.

  At this time, the control device discharges the air in the upper and rear ducts from the upper ventilation port through the ceiling duct and sucks the air from the upper ventilation port and the air from the upper ventilation port. Since the second operation state of discharging from the lower vent through the ceiling duct and the upper rear duct is executed, an upper temperature sensor for detecting the temperature in the upper display chamber is provided and opened as in the invention of claim 2, for example. In the environment where the temperature around the showcase is high, when the temperature in the upper display chamber detected by the upper temperature sensor is equal to or higher than the predetermined upper limit temperature, the control device controls the blower to the first operating state, Lowers the temperature in the upper display chamber by discharging the air in the lower part of the upper and lower back ducts and the upper display room, which has been cooled by cooling from the lower display room and the lower rear duct, from the upper vent to the upper display room for circulation. be able to

  Also, in an environment where the temperature around the open showcase is not high, if the temperature in the upper display room falls below the predetermined lower limit due to cooling from the lower display room or the lower rear duct, By controlling the device to the second operating state, outside air can be sucked from the upper ventilation port, discharged from the lower ventilation port and circulated into the upper display chamber, and temperature drop in the upper display chamber can be eliminated or suppressed. .

  Accordingly, in the present invention, a product such as a lunch box can be displayed in an appropriate temperature state without being overcooled in the upper display chamber. In particular, a heating device for temperature compensation such as an electric heater is not required, or the heating capacity of the heating device can be reduced, which can contribute to energy saving.

  In this case, if the blower device is constituted by the first blower for executing the first operation state and the second blower for executing the second operation state as in the invention of claim 3, A blower can be configured using a relatively inexpensive blower.

  Further, if the blower is attached to the grill formed on the mounting plate that closes the upper and rear ducts and the first and second blowers are overlapped and provided as in the invention of claim 4, the first operating state is obtained. Switching to the second operating state can be performed smoothly.

  On the other hand, if the blower device is constituted by a single blower capable of rotating forward and reverse as in the invention of claim 5, the number of parts can be reduced, and the ventilation resistance in the upper and lower ducts and the ceiling duct can be reduced. Is possible.

  Further, a series of rear ducts extending from the lower display chamber to the upper display chamber as in the invention of claim 6 are provided, and the intermediate duct member is mounted in the display chamber so that the position of the intermediate duct member can be changed. Correspondingly, a damper member for closing the rear duct so as to be openable and closable is provided, and by closing the rear duct with this damper member, the upper rear duct and the lower rear duct are partitioned to form an intermediate duct from the lower rear duct. If the cold air is guided, the ratio of the volume of the upper display chamber and the lower display chamber can be easily changed by changing the position of the intermediate duct member, and flexibly respond to changes in the products displayed. Will be able to.

  In this case, if the lower ventilation port and the blower device are arranged above the range in which the intermediate duct member can be mounted as described above, the upper and lower ventilation ports can be changed even if the position of the intermediate duct member is changed. And the air circulation in the upper display room using the blower can be formed without any trouble.

It is a front view of an open showcase to which the present invention is applied. It is a vertical side view of the open showcase of FIG. It is a block diagram of the control apparatus of the open showcase of FIG. It is a vertical side view explaining the 1st driving | running state of the open showcase of FIG. It is a vertical side view explaining the 2nd driving | running state of the open showcase of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an open showcase 1 to which the present invention is applied, and FIG. 2 is a longitudinal side view thereof (a state in which an intermediate duct member 35 is attached to a shelf 30 in the fourth stage from the top). The open showcase in the present embodiment displays, for example, processed food such as a lunch box at room temperature (for example, + 18 ° C. to + 22 ° C.) in the upper portion of the display chamber 11 (upper display chamber 11A described later), and the lower portion of the display chamber 11 ( In the lower display room 11B) described later, for example, daily goods such as beverages are displayed at a lower refrigeration temperature (so-called chilled, for example, + 3 ° C. to + 7 ° C.). In addition, the operating temperature of the lower display chamber 11B is not limited to the said temperature.

  The open showcase 1 is composed of a heat insulating wall 3 having a substantially U-shaped cross section that opens to the front surface and side plates 22 attached to both sides thereof, and a main body 5 is formed inside the heat insulating wall 3 from the back surface to the top surface. A metal partition plate (interria) 6 is disposed with a space therebetween, and a rear duct 7 and a ceiling duct 46 communicating with the upper end thereof are formed between the partition plate 6 and the heat insulating wall 3. A deck pan 10 extending forward is provided at the lower end of the partition plate 6. A display chamber 11 that opens to the front is formed inside the partition plate 6 and the deck pan 10.

  At the upper edge of the front opening 2 of the heat insulating wall 3, a cold air discharge port 14 is formed as an upper ventilation port communicating with the front end of the ceiling duct 46. A lower duct 12 communicating with the lower end of the rear duct 7 is formed on the lower side of the deck pan 10, and the front end of the lower duct 12 is located at the lower edge of the front opening of the display chamber 11 and from a plurality of slits. It communicates with the cold air inlet 13.

  A fan case 4A is installed in the lower duct 12 on the lower side of the deck pan 10, and a main blower 4 for supplying cold air is disposed in the fan case 4A. Further, a cooler 8 constituting a refrigeration cycle of the cooling device is vertically provided in the lower part of the rear duct 7 of the display chamber 11. Further, a cover member 21 for abutting a damper member 39 described later is provided above the cooler 8.

  The upper end of the cover member 21 is substantially at the center of the rear duct 7, in the present embodiment, from the upper rear side of the fourth-tier shelf 30 to be described later to the position corresponding to the lower rear side of the fifth-tier shelf 30. The upper and lower ends are closed. The cover member 21 is provided with a predetermined distance from the upper surface of the cooler 8, and the front surface of the cover member 21 is provided with a predetermined distance from the partition plate 6. A cool air passage 24 is formed in the space between the partition plate 6 and the cover member 21, and the cool air outlet 23 for allowing the cool air after passing through the cooler 8 to flow into the cool air passage 24 is cooled with the lower end of the cover member 21. It is formed between the upper ends of the vessel 8.

  On the other hand, shelves 30 are erected in the display chamber 11 in a plurality of stages, in this embodiment, six stages. Each shelf 30 includes a bracket 31 and a shelf plate 32 supported by the bracket 31. A plurality of engagement claws (not shown) are formed at the rear end of the bracket 31, and the engagement claws are detachably engaged with the engagement holes of the column 31 </ b> A attached vertically to the left and right in the display chamber 11. As a result, the brackets 31 are attached to the display chamber 11 in a pair of left and right positions at a predetermined height.

  In the present embodiment, an intermediate duct member 35 is provided on the shelf 30 that is installed in the fourth row from the top. Hereinafter, the shelf 30 provided with the intermediate duct member 35 is referred to as a shelf 30A. This intermediate duct member 35 is configured by an internal hollow rectangular body that forms an intermediate duct 38 inside, and is mounted on the inner side of the brackets 31, 31 of the shelf 30 </ b> A and below the shelf plate 32. Yes. The intermediate duct member 35 can be attached to and detached from the display chamber 11 by allowing the shelf 30 </ b> A to be attached to and detached from the display chamber 11. In this case, the intermediate duct member 35 may be detachable from the shelf 30A.

  The intermediate duct member 35 (and the shelf 30) divides the interior of the display chamber 11 into upper and lower parts, and an upper display chamber 11A is formed above the intermediate duct member 35 and a lower display chamber 11B is formed below. The rear duct 7 is a series of ducts extending from the lower display chamber 11B to the upper display chamber 11A. The front end of the intermediate duct member 35 is configured to extend to the front end of the shelf plate 32 or to the front of the front end, and an intermediate cold air discharge port 36 that extends in the left-right direction and opens downward is formed at the front end of the lower surface. Is formed. The rear end of the intermediate duct member 35 extends further to the rear than the rear end of the shelf board 32, and a communication portion of the intermediate duct 38 opened rearward is formed at the rear end.

  Here, the partition plate 6 at a position corresponding to the rear of the intermediate duct member 35 attached to the shelf 30 </ b> A matches the communication portion at the rear end of the intermediate duct 38, and connects the rear duct 7 and the intermediate duct 38. A communication hole 40 is formed on the left and right sides.

  The communication hole 40 is not limited to the position corresponding to the shelf 30A installed in the fourth stage from the top, but in this embodiment, the shelf 30 (the fifth stage from the top) installed below the shelf 30A. The fifth shelf 30 is the shelf 30A provided with the intermediate duct member 35 (or the intermediate duct member 35 is attached to the fifth shelf 30). Mounting), the position of the intermediate duct member 35 can be changed in the display chamber 11. Correspondingly, the cover member 21 corresponds to the height of the shelf 30 at the fifth level from the top. Further, the communication hole 40 (when not in use) that the intermediate duct member 35 does not correspond to is closed by a damper member 39 described below.

  A metallic damper member 39 is attached to the upper side of each communication hole 40 of the partition plate 6 so as to be located in the rear duct 7. The upper end of the damper member 39 is pivotally supported on the rear duct 7 side of the partition plate 6, and is always suspended and closes the communication hole 40 as described above along the partition plate 6. When the rear duct 7 is opened and rotated and inclined, the front end of the rear duct 7 comes into contact with the cover member 21, so that the rear duct 7 (in the present embodiment, the rear duct) is located above the communication hole 40. The cold air passage 24) formed in the lower part of the duct 7 is closed. In this state, the series of rear ducts 7 is divided into an upper rear duct 7A and a lower rear duct 7B.

  On the other hand, the intermediate duct member 35 is switched between an actuator 37 for opening and closing the damper member 39 and a state in which the actuator 37 has moved forward and a state in which the actuator 37 projects into the rear duct 7 behind the communication hole 40. An operation unit (not shown) is provided. When the actuator 37 is protruded rearward by operating this operation portion, the actuator 37 abuts against the damper member 39 of the communication hole 40 corresponding to the intermediate duct member 35 to rotate it, and tilts obliquely. As a result, the rear duct 7 is closed. In this state, the cool air rising from below the damper member 39 is prevented from rising upward and is guided into the intermediate duct 38 via the communication hole 40 and the communication portion.

  Further, by closing with the damper member 39, the rear duct 7 is partitioned into an upper rear duct 7A above the damper member 39 and a lower rear duct 7B below it, and the upper rear duct 7A is the lower rear duct 7B. The cooler 8 is positioned in the lower back surface duct 7B so that the lower back surface duct 7B corresponds to the back side of the lower display chamber 11B.

  Further, the partition plate 6 at the lower back of the upper display chamber 11A between the shelf 30A of the embodiment and the shelf 30 thereabove is positioned above the position changeable range of the intermediate duct member 35 (the upper damper). A plurality of lower air vents 42 are formed across the left and right to communicate the interior of the upper display chamber 11A, the lower portion, and the upper rear duct 7A. Further, in the upper back duct 7A located above the lower ventilation opening 42, a mounting plate 41 for closing the upper rear duct 7A is attached over the entire width and formed on the left and right sides of the mounting plate 41. A blower 43 is attached to each grill.

  Each blower device 43 is composed of a first blower 44 and a second blower 45 each composed of an axial fan, and these are superposed. By superposing and using the two blowers 44 and 45 in this way, it is possible to suppress the natural convection of the cold air when it is not desired to circulate the cold air, that is, when the blowers 44 and 45 are stopped. it can. In this case, the lower first blower 44 rotates and discharges air upward, and the upper second blower 45 rotates and discharges air downward.

  On the other hand, the open showcase 1 in this embodiment includes a compressor 15 (FIG. 3), a condenser, a condenser blower 16 (FIG. 3) and the like that constitute a refrigeration cycle together with the cooler 8. Is provided separately, for example, in a machine room in a store.

  The cooling device constituting the refrigeration cycle includes a compressor 15, a condenser, an electric expansion valve (or electromagnetic valve) 17 (FIG. 3) as a decompression device, and a cooler 8 sequentially connected to form an annular refrigeration cycle. It is composed.

  Next, the control device 20 of the open showcase 1 in the present embodiment will be described in detail with reference to FIG. In the present embodiment, the control device 20 is constituted by a general-purpose microcomputer and incorporates a memory 25 as a storage unit.

  On the input side of the control device 20, there are a control panel 29, a setting changeover switch 26, an upper temperature sensor 27 for detecting the temperature in the upper display chamber 11A, and a lower temperature for detecting the temperature in the lower display chamber 11B. A sensor 28 is connected. The setting changeover switch 26 cools the entire display room 11 (upper display room 11A and lower display room 11B) to, for example, a chilled temperature, or changes the temperature in the display room 11 up and down, that is, lowers the upper display room 11A at room temperature. This is a switch for arbitrarily switching whether the display room 11B is set to the chilled temperature.

  On the other hand, on the output side of the control device 20, the compressor 15 constituting the cooling device, the expansion valve 17, the main blower 4, the condenser blower 16, and the first and second blowers 44 and 45 of the blower 43. (Shown one by one in FIG. 3, but actually two are provided).

  Next, the operation control of the open showcase 1 by the control device 20 with the above configuration will be described. In this case, the operation portion of the intermediate duct member 35 is operated so that the actuator 37 protrudes backward, the damper member 39 closes the rear duct 7, and the setting changeover switch 26 sets the upper display chamber 11A to room temperature. It is assumed that the lunch boxes are displayed and the lower display room 11B is switched to the chilled temperature to display daily items.

  When the compressor 15 and the main blower 4 are operated by the control device 20, the cold air sucked into the lower duct 12 is discharged from the rear part of the fan case 4 </ b> A, passes through the cooler 8, and the cool airflow of the cover member 21. From the outlet 23, the air flows into a cool air passage 24 formed between the front surface of the cover member 21 and the partition plate 6, and ascends the cool air passage 24.

  The low temperature cold air that has risen in the cold air passage 24 is prevented from rising upward by the damper member 39, and is connected to the intermediate duct from the communication portion of the intermediate duct member 35 through the communication hole 40 formed in the partition plate 6. 38 flows in. The cold air flowing into the intermediate duct 38 is blown out from the intermediate cold air discharge port 36 formed at the front end of the intermediate duct member 35 toward the cold air suction port 13 formed at the lower edge of the front opening of the lower display chamber 11B. The Further, a part is blown out directly from the lower part of the partition plate 6 into the lower display chamber 11B.

  Thereby, the cold air discharged from the intermediate cold air discharge port 36 formed on the lower surface of the front end of the intermediate duct member 35 is cooled in the front opening of the lower display chamber 11B below the shelf 30A provided with the intermediate duct member 35. The inside of the lower display chamber 11B is cooled while forming an air curtain. And the circulation which is attracted | sucked by the lower duct 12 from the cold air inlet 13 and is suck | inhaled by the main air blower 4 again is repeated (it shows by the black arrow in FIG. 4, FIG. 5).

  The control device 20 controls the expansion valve 17 based on the temperature in the lower display chamber 11B detected by the lower temperature sensor 28. For example, when the temperature of the lower display chamber 11B falls to + 3 ° C. (lower limit) or lower, the expansion valve 17 is closed to stop the supply of refrigerant to the cooler 8 and rise to + 7 ° C. (upper limit) or higher. The expansion valve 17 is opened and the refrigerant supply is resumed. The main blower 4 is continuously operated. The compressor 15 and the condenser blower 16 are controlled by the low-pressure side pressure of the refrigeration cycle. As a result, the control device 20 maintains the inside of the lower display chamber 11B as an average at a chilled temperature of + 5 ° C.

  On the other hand, the control device 20 controls the operation of the blowers 44 and 45 of the blower device 43 based on the temperature in the upper display chamber 11 </ b> A detected by the upper temperature sensor 27. For example, when the ambient temperature of the open showcase 1 is increased to + 27 ° C. or the like in summer or the like and the temperature in the upper display chamber 11A rises to + 22 ° C. (upper limit) or more, the control device 20 outputs the output of the upper temperature sensor 27. Based on the above, the first blower 44 is operated, and the second blower 45 is stopped to be in the first operation state. The first blower 44 rotates to discharge air upward.

  Here, although the cool air does not flow into the upper and lower ducts 7A by the damper member 39 in principle, the upper and lower ducts 7A are moved by the movement of heat transmitted through the gaps between the constituent members and the metal damper members 39 and the partition plate 6. The inner and lower portions and the lower portion of the upper display chamber 11A are cooled. Therefore, the temperature of the air before and after the lower ventilation port 42 is low, and the low temperature air is sucked by the first blower 44 and blown up in the upper back duct 7A, passes through the ceiling duct 46, and the cold air discharge port 14 (Upper vent) is discharged from there toward the front opening of the upper display chamber 11A.

  The air discharged into the upper portion of the upper display chamber 11A cools the upper display chamber 11A, then flows into the upper rear duct 7A from the lower ventilation port 42 at the lower rear portion, and is sucked into the first blower 44 again. The circulation is repeated (indicated by white arrows in FIG. 4). Thereby, the inside of the upper display chamber 11A is cooled, and further temperature rise is prevented or suppressed.

  Next, for example, when the ambient temperature of the open showcase 1 is lowered to + 18 ° C. or the like in winter or the like (environment in which the outside air temperature is not so high), the temperature in the upper display chamber 11A also decreases. Based on the output of the upper temperature sensor 27, the control device 20 stops the first blower 44 and operates the second blower 45 when the temperature in the upper display chamber 11 </ b> A falls below + 18 ° C. (lower limit value). Switch to the second operating state. The second blower 45 rotates to discharge air downward.

  In addition, after stopping the 1st air blower 44, both the air blowers 44 and 45 may be stopped about several seconds, and you may make it drive the 2nd air blower 45 after that. In this case, the partition plate 41 closes the upper and rear ducts 7A, and both the blowers 44 and 45 are superposed. Therefore, when the first blower 44 stops, the natural convection of air due to inertia stops quickly. To come. As a result, when the second blower 45 starts to rotate, the air circulation direction can be quickly switched to smoothly switch from the first operating state to the second operating state.

  The air in the lower part of the upper rear duct 7A is discharged from the lower ventilation port 42 to the lower part in the upper display chamber 11A by the second blower 45 and rises in the upper display chamber 11A together with the air in the lower part to the cold air discharge port 14. Then, it is sucked from there and flows into the ceiling duct 46, and the circulation is again sucked into the second blower 45 through the upper and rear ducts 7A (indicated by white arrows in FIG. 5). At this time, outside air is also sucked from the cool air discharge port 14 through the front opening of the upper display chamber 11A.

  Here, as described above, the lower part in the upper display chamber 11A receives the cooling action from the lower display chamber 11B and the lower back duct 7B, so that even if the first blower 44 is stopped as described above, the upper display chamber 11A Although the temperature of the inner and lower parts continues to decrease and overcooling occurs, the second blower 45 is operated as in the present invention to suck outside air and discharge it from the lower vent 42 to the inner lower part of the upper display chamber 11A. The over-cooling in the lower part of the upper display chamber 11A is prevented or suppressed.

  Thus, according to the present invention, in the upper display chamber 11A, a product such as a lunch box can be displayed in an appropriate temperature state without being overcooled. In this case, an electric heater that consumes more power than the blowers 44 and 45 is not required, or the heating capacity of the electric heater can be reduced, which can contribute to energy saving.

  In the embodiment, the blower device 43 includes the first blower 44 for executing the first operation state and the second blower 45 for executing the second operation state. The blower device 43 is configured using a relatively inexpensive axial fan, so that an increase in cost can be suppressed.

  Here, when the outside air temperature increases and the temperature in the upper display chamber 11 </ b> A rises to the upper limit value or more, the control device 20 stops the second blower 45 and operates the first blower 44. Switch to the operating state. Also in this case, the first blower 44 may be operated with the second blower 45 and the first blower 44 both stopped for about several seconds.

  In the embodiment, the first blower 44 and the second blower 45 are superposed and arranged in the upper back duct 7A. However, the invention is not limited to this except for the invention of claim 4, and for example, the first blower 44 is placed on the upper rear face. The second blower 45 may be disposed in the ceiling duct 46 by being disposed in the duct 7A.

  Moreover, you may comprise the air blower 43 with the single air blower which can rotate forward / reverse, without comprising the air blower 43 from the two air blowers 44 and 45 like an Example. Thereby, the number of parts can be reduced, and the ventilation resistance in the upper and rear ducts 7A and the ceiling duct 46 can also be reduced.

  Furthermore, in the embodiment, a series of rear ducts 7 extending from the lower display chamber 11 </ b> B to the upper display chamber 11 </ b> A are provided, and the intermediate duct member 35 is attached in the display chamber 11 so that the position can be changed. A damper member 39 that closes the rear duct 7 so as to be openable and closable is provided corresponding to each mounting position of the intermediate duct member 35, and the upper duct 7A is closed by closing the rear duct 7 with the damper member 39. And the lower rear duct 7B are partitioned and the cool air is guided from the lower rear duct 7B to the intermediate duct 38. Therefore, the position of the intermediate duct member 35 is changed to change the upper display chamber 11A and the lower display chamber 11B. It becomes possible to easily change the volume ratio.

  Thereby, it becomes possible to flexibly cope with a change in the ratio of the lunch boxes to be displayed and the daily goods. Also in this case, since the lower ventilation port 42 and the blower 43 are provided above the range in which the intermediate duct member 35 can be mounted, the cold air discharge port 14 can be changed even if the mounting position of the intermediate duct member 35 is changed. The air circulation in the upper display chamber 11A using the lower ventilation port 42 and the blower device 43 can be formed without hindrance.

  Here, when the entire display chamber 11 (upper display chamber 11A and lower display chamber 11B) is used at room temperature (for lunch), the operation portion of the intermediate duct member 35 is operated to move the actuator forward. As a result, the damper member 39 opens the rear duct 7 (cold air passage 24). Then, the setting changeover switch 26 is switched to a setting in which the entire display chamber 11 is at room temperature. With this setting switching, the control device 20 controls the main blower 4 (the expansion valve 17 is closed) based on the temperature of the entire display chamber 11 detected by the upper temperature sensor 27 this time.

  At this time, the blowers 44 and 45 of the blower device 43 are stopped (the first blower 44 may be operated). As a result, air at normal temperature reaches the ceiling duct 46 from the rear duct 7 and is repeatedly circulated through the cold air outlet 14 and sucked from the cold air inlet 13. Thus, the entire display chamber 11 is maintained at room temperature.

  Moreover, it is also possible to cool the entire display chamber 11 to the chilled temperature by controlling the expansion valve 17 by the control device 20 and exerting the cooling action by the cooler 8. Thereby, the open showcase 1 can be made convenient.

  Further, in the embodiment, the position of the intermediate duct member 35 can be changed, and the series of the rear duct 7 is divided into the upper rear duct 7A and the lower rear duct 7B by the damper member 39. In the invention, the heat insulating wall 3 is not limited thereto, and the intermediate duct member 35 is fixed, and the upper display chamber 11A, the lower display chamber 11B, and the upper back duct 7A and the lower back duct 7B are respectively independent display chambers and ducts from the beginning. Even those configured inside are also effective.

DESCRIPTION OF SYMBOLS 1 Open showcase 2 Heat insulation wall 4 Main blower 6 Partition plate 7 Back surface duct 8 Cooler 11 Display room 11A Upper display room 11B Lower display room 12 Lower duct 13 Cold air inlet 14 Cold air outlet (upper vent)
20 Control Device 27 Upper Temperature Sensor 28 Lower Temperature Sensor 30 Shelf 30A Shelf (having an intermediate duct member)
35 Intermediate duct member 36 Intermediate cool air discharge port 38 Intermediate duct 39 Damper member 42 Lower ventilation port 43 Blower device 44 First blower 45 Second blower 46 Ceiling duct

Claims (7)

By dividing the inside of the heat insulating wall opened on the front surface vertically by an intermediate duct member, an upper display chamber and a lower display chamber are formed, and the lower back duct and the intermediate duct in the intermediate duct member are formed in the lower display chamber. By circulating the cool air heat exchanged with the cooler, the lower display chamber is cooled while forming a cool air curtain at the front opening of the lower display chamber, and the upper display chamber is different from the lower display chamber In an open showcase used at temperature,
An upper rear duct configured to be behind the upper display chamber and above the lower rear duct;
A ceiling duct configured to communicate with the upper back duct and above the upper display chamber;
An upper ventilation opening formed at the upper edge of the front opening of the upper display chamber and communicating with the ceiling duct;
A lower ventilation port formed at the lower back of the upper display chamber and communicating with the upper rear duct;
A blower that forms an air circulation between the upper display chamber, the upper back duct, and the ceiling duct;
A control device for controlling the operation of the blower,
The control device is configured to discharge the air in the upper back duct through the ceiling duct from the upper ventilation port and suck the air from the lower ventilation port by the blower;
An open showcase, wherein a second operation state is performed in which air is sucked from the upper vent and discharged from the lower vent via the ceiling duct and the upper back duct. An upper temperature sensor for detecting the temperature in the upper display chamber;
When the temperature in the upper display chamber detected by the upper temperature sensor is equal to or higher than a predetermined upper limit temperature, the control device controls the blower to the first operating state,
2. The open showcase according to claim 1, wherein when the temperature in the upper display chamber becomes equal to or lower than a predetermined lower limit temperature, the blower is controlled to the second operation state.   The said air blower is comprised from the 1st air blower for performing the said 1st driving | running state, and the 2nd air blower for performing the said 2nd driving | running state, It is characterized by the above-mentioned. The open showcase according to claim 1 or claim 2.   4. The open showcase according to claim 3, wherein the blower is attached to a grill formed on a mounting plate that closes the upper and rear ducts, and the first and second blowers are superposed. 5. .   The open showcase according to claim 1 or 2, wherein the blower device is configured by a single blower capable of rotating forward and reverse. A series of rear ducts extending from the lower display room to the upper display room;
The intermediate duct member is mounted in the display chamber so that the position of the intermediate duct member can be changed, and a damper member that closes the rear duct so as to be openable and closable is provided corresponding to each mounting position of the intermediate duct member. 6. The upper rear duct and the lower rear duct are partitioned by closing the rear duct, and cool air is guided from the lower rear duct to the intermediate duct. Open showcase described in any of them.   The open showcase according to claim 6, wherein the lower ventilation port and the blower are arranged above a range in which the attachment position of the intermediate duct member can be changed.

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