JP5143162B2 - Refrigerated open display case - Google Patents

Description

  The present invention relates to a freezer / refrigerated open showcase, and more particularly to the elimination of uneven temperature in a freezer / refrigerated open showcase having a multi-stage product display shelf in the refrigerator.

  Some conventional showcases averaged the amount of cool air blown into the cabinet through the cold vents on the back panel that opened at different heights to accommodate the product display shelves, eliminating temperature irregularities in the cabinet. (For example, refer to Patent Document 1).

  Also, two coolers are provided, the cool air that has passed through the first cooler is blown out from the lower stage of the product display shelf, and the cool air that has passed through the first cooler and the second cooler is blown out from the upper part of the product display shelf. There has been a low-temperature showcase (see, for example, Patent Document 2).

Japanese Patent Laying-Open No. 2008-125589 (page 4, FIG. 1) JP-A-60-256773 (page 3 to page 4, FIG. 4)

  As in Patent Document 1, when trying to eliminate the temperature distribution in the chamber by averaging the air volume of the cold air blown into the chamber, the cold air blown out from the lower cold air blowing hole is heated in the chamber through the back panel. The temperature rises more than the cold air blown out from the upper cold air blowing hole. In addition, the freezer / refrigerated open showcase insulates the outside air from the outside with a cool air curtain formed by the cool air blown out from the upper part of the inside of the cabinet. As the temperature increases, the temperature becomes higher, and as a result, the lower temperature of the product display shelf is higher than the upper temperature. Therefore, when cold air having a higher temperature than the upper stage is blown into the lower product display shelf having a high internal temperature, it is difficult to eliminate the temperature unevenness on the upper and lower stages only by adjusting the air volume.

  Also, as in Patent Document 2, when cold air is blown out only from the upper and lower product display shelves, the temperature unevenness in the middle is eliminated in a multi-stage freezer / refrigerated open showcase with five or more product display shelves. There was a problem that it was difficult to do.

  The present invention has been made in order to solve the above-described problems, and adjusts the air volume and temperature of the cold air blown from the rear panel so that there is no temperature unevenness in the upper, middle and lower stages. The purpose is to provide.

The frozen and refrigerated open showcase according to the present invention is
A product display room in which a plurality of product display shelves are installed is provided in a showcase body consisting of a box-shaped heat insulating wall whose front side is open, and a back panel is interposed between the product display room and the heat insulating wall. A cold air circulation type open showcase that keeps the displayed product cold by circulating cold air to the product display room through a main cooler arranged in the provided cold air circulation duct,
The cold air circulation duct communicates with the upper cold air outlet at the top of the product display room,
The main cooler is installed at the lower part between the rear panel in the cold air circulation duct with an air path separated,
The back panel is provided with a back cold air outlet corresponding to at least two commodity display shelves,
A sub-cooler is disposed in the air path between the rear panel and the main cooler,
The cool air cooled by the main cooler is blown out from the upper cool air outlet, the cool air cooled by the main cooler is blown out from a part of the rear cool air outlet holes, and the main cooler is blown out from the other rear cool air outlet holes. And the cooled air is blown out in the order of the sub-cooler ,
The back cold air outlet holes are arranged corresponding to the plurality of product display shelves, and the sub-cooler is lower than the uppermost rear cold air outlet hole and above the lowermost rear cold air outlet hole. arranged is obtained by the so that.

  The present invention is a freezing and refrigeration open showcase having an upper and lower multistage product display shelf that tends to have a higher temperature in the lower compartment than the upper stage, in the cold air blown out from the cold air outlet hole installed in the rear panel of the warehouse, Not only can the air volume be adjusted, but the temperature can be adjusted by cooling with the sub-cooler, so that the internal temperature irregularity can be efficiently eliminated. Moreover, the cooling capacity of the refrigerator can be reduced by eliminating the internal temperature unevenness, and an energy-saving freezer-refrigerated open showcase can be obtained.

It is a longitudinal cross-sectional view of the freezer / refrigeration open showcase which concerns on Embodiment 1 of this invention. FIG. 3 is a refrigerant circuit diagram of the freezer / refrigeration open showcase according to Embodiment 1. It is a refrigerant circuit figure of the freezer / refrigeration open showcase which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
In FIG. 1, a showcase body 3 of a freezer / refrigerated open showcase (hereinafter simply referred to as an open showcase) is formed of a substantially box-shaped heat insulating wall 1 and has an opening 2 for putting in and out a product on the front surface. Yes. The interior of the showcase body 3 is partitioned into a product display chamber 5 and a cold air circulation duct 6 by a partition plate (back panel) 4. Further, a protective air circulation duct 7 is provided outside the cold air circulation duct 6. Is formed. The cold air circulation duct 6 and the protective air circulation duct 7 are formed in a substantially U-shaped cross section along the heat insulating wall 1, and the cold air circulation duct 6 includes a cold air bottom duct 6a, a cold air back surface duct 6b, and a cold air upper surface duct 6c. The protective air circulation duct 7 includes an air bottom duct 7a, an air back duct 7b, and an air top duct 7c.

  The cool air circulation duct 6 includes a blower 8, a main cooler 9, and a sub cooler 10. The blower 8 is disposed in the cool air bottom duct 6 a, and the main cooler 9 and the sub cooler 10 are cool air. It is disposed in the back duct 6b. The upper part of the cool air circulation duct 6 (the downstream end of the cool air upper surface duct 6 c) communicates with the cool air outlet 11, and the lower part (the upstream end of the cool air bottom duct 6 a) communicates with the cold air inlet 12.

  The protective air circulation duct 7 has a blower (not shown) disposed therein, and the upper part (the downstream end of the air upper surface duct 7 c) communicates with a protective air outlet 13 provided on the front side of the cold air outlet 11. The lower part (upstream end of the air bottom duct 7a) communicates with the protective air suction port 14.

  The merchandise display room 5 is provided with a plurality of merchandise display shelves 15. For example, the first display shelf 15 a, the second display shelf 15 b, the third display shelf 15 c, and the fourth display are arranged below the upper level. A shelf 15d is installed.

  In the partition plate 4, for example, one or a plurality of back cold air blowing holes 16 are provided in one stage of the product display shelf 15, and the cool air is blown out from the back surface of the product display shelf 15. In the first embodiment, a first cold air outlet 16a is provided above the third display shelf 15c, and a second cold air outlet 16b is provided above the fourth display shelf 15d. Below the four display shelves 15d, third, fourth, and fifth cold air outlets 16c, 16d, and 16e are provided.

  The main cooler 9 is disposed on the protective air circulation duct 7 side of the cold air circulation duct 6, and an air passage 18 is formed between the partition plate 4 and the cooler partition plate 17.

  The sub-cooler 10 is installed below the uppermost backside cold air outlet 16 in the air passage 18 and above the lowermost backside cold air outlet 16. In this Embodiment 1, it is installed between the 1st cold air blowing hole 16a and the 2nd cold air blowing hole 16b.

  In the refrigerant circuit diagram of the open showcase of FIG. 2, the main cooler 9 and the sub-cooler 10 are composed of a compressor 22, a condenser 23, an expansion valve in a refrigerator 21 installed separately from the open showcase body 3. 24 are connected in parallel between the expansion valve 24 and the compressor 22 connected by the refrigerant pipe 25 in the order of 24. Further, between the expansion valve 24, the main cooler 9 and the sub cooler 10, an adjustment valve 26 for adjusting the amount of refrigerant flowing into the main cooler 9 and the sub cooler 10 is provided.

Next, the operation will be described.
In order to keep the inside of the product display room 5 cool, the fan 8, the main cooler 9, and the subcooler 10 are operated, and the air sucked from the cold air inlet 12 is cooled by the cold air circulation duct 6 (cold air bottom duct 6 a, cold air rear duct 6b and the cool air upper surface duct 6c) are cooled and blown out as cool air from the upper cool air outlet 11 toward the opening 2 to form a cool air curtain 19 in the opening 2 (the flow of air is indicated by a solid line a). At the same time, a blower (not shown) in the protective air circulation duct 7 (the air bottom duct 7a, the air back duct 7b, and the air top duct 7c) is activated, and the outside air sucked from the protective air inlet 14 is protected by the protective air outlet 13. The protective air curtain 20 is formed outside the cold air curtain 19 (the air flow is indicated by a broken line C). In addition, cool air is blown out from the back cold air blowing holes 16 (first to fifth cold air blowing holes 16a to 16e) to keep the inside of the commodity display chamber 5 (the flow of air is indicated by a solid line B).

  In the open showcase according to Embodiment 1 of the present invention, in addition to the cold air curtain 19 from the cold air outlet 11, the cold air blown out from the back cold air outlet hole 16, that is, the first cold air outlet hole 16a is blown out. In order to keep the inside of the product display chamber 5 with the cool air further cooled by the sub cooler 10, that is, the cool air blown out from the second to fifth cool air blowing holes 16b to 16e, Rather than adjusting the air volume of the cool air from the blowout hole to keep the product display room cool, the product display room 5 is effectively kept cool even when the product display room 5 is full of products up to the back of the product display room 5. can do.

  Further, the amount of refrigerant in the main cooler 9 and the sub cooler 10 is adjusted using the adjustment valve 26, and the evaporation temperature of the main cooler 9 and the sub cooler 10 is adjusted, so that the temperature in the product display chamber 5 can be reduced. Correspondingly, the temperature of the cool air from the cool air curtain 19 and the back cool air blowing holes 16 (first to fifth cold air blowing holes 16a to 16e) can be controlled, and temperature unevenness can be eliminated.

  In addition, the sub cooler 10 has a lowermost rear cool air outlet 16 (fifth cool air outlet) below the uppermost rear cool air outlet 16 (first cold outlet 16a) of the air passage 18. It is installed above the hole 16e). Therefore, the cool air blown out from the back cool air blowing holes 16 (second to fifth cool air blowing holes 16b to 16e) located below the sub cooler 10 is located on the back side above the sub cooler 10. The temperature can be lower than that of the cold air blown out from the cold air blowing hole 16 (first cold air blowing hole 16a). Therefore, by providing the uppermost rear cool air outlet 16 in the middle stage of the product display shelf 15, the middle stage of the product display shelf 15 is cooled by the cold air immediately after passing through the main cooler 9, and the temperature rises further than the middle stage. The lower stage of the display shelf 15 can be cooled by the main cooler 9 and further cooled by the cool air cooled by the sub cooler 10, and even in an open showcase with a large number of shelves such as five or more product display shelves, The temperature unevenness in the middle and lower stages can be finely eliminated.

  Moreover, by eliminating the inside temperature unevenness as described above, the cooling capacity of the refrigerator can be reduced, and an energy-saving open showcase can be obtained.

Embodiment 2. FIG.
In the first embodiment, the main cooler 9 and the sub-cooler 10 are configured by the refrigerant pipe 25 in the order of the compressor 22, the condenser 23, and the expansion valve 24 in the refrigerator 21 installed separately from the open showcase body 3. The main cooler 9 and the sub-cooler are connected in parallel between the connected expansion valve 24 and the compressor 22 by a regulating valve 26 provided between the expansion valve 24, the main cooler 9 and the sub-cooler 10. 10 by adjusting the amount of refrigerant flowing into 10 and adjusting each evaporation temperature to control the temperature of the cold air from the cold air curtain 19 and the back cold air outlet 16 in response to the temperature unevenness of the commodity display chamber 5; Although configured so as to eliminate the temperature unevenness, in the second embodiment, the main cooler 9 and the sub cooler 10 are installed in series.
In the refrigerant circuit diagram of the open showcase of FIG. 3, the same functional parts as those of the first embodiment are denoted by the same reference numerals, and the description of the overlapping configuration is omitted, and different configurations are described.

The main cooler 9 and the sub cooler 10 are an expansion valve 24 connected by a refrigerant pipe 25 in the order of a compressor 22, a condenser 23, and an expansion valve 24 in a refrigerator 21 installed separately from the open showcase body 3. Are connected in series in the order of the sub-cooler 10 and the main cooler 9. Thereby, the cool air of the back cool air outlet 16 can be made cooler than the cool air curtain 19 that blows out from the cool air outlet 11, and the lower part of the product display shelf 15 that easily rises in temperature is effectively cooled. Can do.
Moreover, the cooling capacity of the refrigerator can be reduced by eliminating the uneven temperature inside the cabinet, and an energy-saving open showcase can be obtained.
Further, since the main cooler 9 and the sub cooler 10 can be connected with a simpler structure than connecting them in parallel, the product weight and manufacturing cost can be reduced.

  DESCRIPTION OF SYMBOLS 1 Heat insulation wall, 2 opening, 3 Showcase main body, 4 Partition plate (back panel), 5 Product display room, 6 Cold air circulation duct, 7 Protective air circulation duct, 8 Blower, 9 Main cooler, 10 Sub cooler, 11 Cold air outlet, 12 Cold air inlet, 13 Protective air outlet, 14 Protective air inlet, 15 Product display shelf, 16 Back cold air outlet, 17 Cooler divider, 18 Air passage, 19 Cold air curtain, 20 Protective air Curtain, 21 Refrigerator, 22 Compressor, 23 Condenser, 24 Expansion valve, 25 Refrigerant piping, 26 Regulating valve.

Claims (5)

A product display room in which a plurality of product display shelves are installed is provided in a showcase body formed of a box-shaped heat insulating wall whose front side is open, and a back panel is provided between the product display room and the heat insulating wall. A cold air circulation type open showcase that circulates cold air to the commodity display room through a main cooler disposed in a cold air circulation duct provided via the cold air circulation type,
The cold air circulation duct communicates with an upper cold air outlet installed in an upper part of the commodity display room,
The main cooler is installed at a lower portion between the rear panel in the cold air circulation duct with an air path therebetween,
The back panel is provided with a back cold air outlet corresponding to at least two of the commodity display shelves,
A sub-cooler is disposed in the air path between the back panel and the main cooler;
Cold air cooled by the main cooler is blown out from the upper cold air outlet, and cold air cooled by the main cooler is blown out from a part of the rear cold air outlet hole, and the other rear cold air outlet hole. From which the cool air cooled in the order of the main cooler and the sub-cooler is blown out ,
The back cold air outlet holes are arranged corresponding to the plurality of product display shelves, and the sub-cooler is lower than the uppermost rear cold air outlet hole and above the lowermost rear cold air outlet hole. A freezer-refrigerated open showcase characterized by being arranged .   The protective air circulation duct which connects with the protective air blower provided in the front side of the said upper cold air blower outlet was provided between the heat insulation wall of the said showcase main body, and the cold air circulation duct. Freezer refrigerated open showcase. The main cooler and the sub cooler are connected in parallel to the expansion valve of a refrigerator having a separately installed compressor, a condenser, and an expansion valve,
The freezer / refrigeration open showcase according to claim 1 or 2, further comprising an adjustment valve for adjusting a refrigerant amount between the expansion valve, the main cooler, and the sub-cooler.   The main cooler and the sub cooler are connected in series in the order of the sub cooler and the main cooler to the expansion valve of a refrigerator having a separately installed compressor, a condenser, and an expansion valve. The refrigerated open showcase according to any one of claims 1 to 3, wherein The rear cool air outlets are respectively provided at the lower part of the second stage product display shelf and the third stage product display shelf of the first stage to fourth stage product display shelves installed in the upper and lower four stages. Three places are installed in the lower part of the fourth stage product display shelf, and the sub-cooler has an upper end near the lower part of the rear cold air outlet provided in the lower part of the second stage product display shelf. The lower end part is arrange | positioned in the upper part of the back surface cold air blowing hole provided in the lower part of the said 3rd step | item merchandise display shelf, The one in any one of Claims 1-4 characterized by the above-mentioned. Refrigerated open showcase.

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