JP2015215131A - Two temperature-type showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-temperature type showcase capable of keeping an internal temperature of a low-temperature area at a set temperature by sufficiently supplying cold air to the low-temperature area while surely forming an air curtain at a front face of the low-temperature area.SOLUTION: In a two-temperature type showcase in which the inside of a display chamber 3 is divided into a low-temperature area A1 at a lower side and a high-temperature area A2 at an upper side by an intermediate duct 10, a duct body 25 of the intermediate duct 10 is provided with a first supply opening 28 for supplying cold air toward a suction port 17 to form an air curtain in the low-temperature area A1, and a second supply opening 29 for supplying cold air toward the inside of the low-temperature area A1. The first supply opening 28 is opened over right and left ends of a front edge portion of a lower wall 25b of the duct body 25, and the second supply opening 29 is opened at a rear edge portion of the lower wall 25b of the duct body 25. A distribution structure is disposed on the intermediate duct 10 to distribute and supply the cold air introduced by a damper portion 26 to the first supply opening 28 and the second supply opening 29.

Description

  The present invention relates to a two-temperature type showcase capable of displaying merchandise in a state where a showcase display room is divided into a low temperature area and a high temperature area by an intermediate duct, and more particularly to an improvement in a structure for supplying cold air to the low temperature area.

  The present applicant has previously proposed this type of showcase (Patent Document 1). In the showcase of Patent Document 1, an intermediate duct is arranged in the middle of the display room, and is divided into a low temperature area below the intermediate duct and a high temperature area above the intermediate duct. In the central part of the rear wall facing the display room, the rear wall outlet that blows out cold air or warm air toward both areas and the damper opening for inserting and installing the intermediate duct are located in a multistage manner. Arranged in a shape. The damper opening is closed by a door disposed on the rear side when the intermediate duct is not inserted and attached. By inserting and installing an intermediate duct into the damper opening, the cool air supplied through the first passage (cold air passage) is blown out from the front outlet of the intermediate duct, and an air curtain is formed by the cold air in front of the low temperature area. Then, the circulating air supplied through the second passage (circulating air passage) is blown out from the upper end front outlet of the high temperature area to form an air curtain by circulating air on the front surface of the showcase. In addition, the longitudinal duct of the first passage is divided into upper and lower parts by an intermediate duct, and cool air is blown out from the rear wall outlet below the damper opening where the intermediate duct is inserted and attached to the low temperature area, and the intermediate duct is inserted and attached. Warm air is blown from the rear wall outlet above the damper opening to the high temperature area.

  In the two-temperature type showcase according to the present invention, the intermediate duct is provided with an outlet for blowing out cool air toward the inside of the low-temperature area. For example, Patent Document 2 is known in this regard. The showcase of Patent Document 2 includes a duct portion (intermediate duct) that can blow cool air from the front end. The duct portion is provided with a group of air outlets over the entire lower surface of the duct portion. From the front end of the duct portion and the air outlet on the lower surface to the inside of the product storage portion (low temperature area) below the duct portion. Cold air is blowing out.

JP 2014-037916 A JP 2006-271823 A

  According to the two-temperature type showcase of Patent Document 1, for example, when the installation area of the showcase cannot be made large, such as a store in a station, it is convenient because products with different display temperatures can be displayed at the same time. Also, the ratio of the products displayed in each area can be adjusted by changing the vertical height of the low temperature area and the high temperature area depending on the vertical mounting position of the intermediate duct with respect to the damper opening. However, as the damper opening into which the intermediate duct is inserted and mounted is located on the upper side, the circulation path length of the cold air becomes longer, and the circulation air speed of the cold air becomes slower due to the pressure loss. In addition, if the circulating air speed of the cold air is slowed down, the wind speed of the cold air blown out from the rear outlet toward the low temperature area decreases, so the cold air is not sufficiently supplied to the inside of the low temperature area, and the internal temperature of the low temperature area Is difficult to maintain at the set temperature. The passage structure for blowing out cool air to the low temperature area is complicated, and this is also a factor that hinders effective circulation of cool air.

  In that respect, in the showcase of Patent Document 2, cold air is blown out from a group of air outlets provided on the lower surface of the duct portion toward the low temperature area, so that it is greatly affected by the circulating air speed of the cold air depending on the mounting position of the intermediate duct. The cold air can be sufficiently blown into the low temperature area without any trouble. However, in the showcase of Patent Document 2, since cold air is blown out from a group of air outlets on the lower surface of the duct portion, the amount of cold air reaching the outlet at the front end of the duct is insufficient, and an appropriate wind speed is applied to the front of the low temperature area. An air curtain cannot be formed. Therefore, the cold air in the low temperature area leaks out of the showcase, and it becomes difficult to maintain the internal temperature of the low temperature area at the set temperature. Further, when the cold air leaks out of the showcase, the operation time of the refrigeration equipment is lengthened to maintain the internal temperature of the low temperature area at the set temperature, leading to an increase in running cost of the showcase.

  An object of the present invention is a two-temperature type that can supply sufficient cold air into the low temperature area and maintain the internal temperature of the low temperature area at a set temperature while reliably forming an air curtain in front of the low temperature area. To provide a showcase.

  The present invention has a main body case 1 and an inner case 2 that partitions the display chamber 3, and a plurality of damper openings 11 are arranged in a multistage shape on the rear wall 2a of the inner case 2 facing the display chamber 3. A two-temperature type showcase in which the inside of the display chamber 3 is divided into a low temperature area A1 on the lower side and a high temperature area A2 on the upper side in an intermediate duct 10 that is inserted and installed in any one of the damper openings 11 Applicable. The intermediate duct 10 includes a duct main body 25 formed in a hollow box shape, and a damper portion 26 that is integrally formed at the rear end of the duct main body 25 and introduces cool air in the cool air passage 4 into the duct main body 25. Yes. Cold air is blown out into the duct body 25 toward the suction port 17 at the lower end front portion of the low temperature area A1 to form an air curtain in the low temperature area A1, and the cold air is blown toward the inside of the low temperature area A1. A second air outlet 29 is provided. The 1st blower outlet 28 is opened over the right-and-left end of the front edge part of the lower wall 25b of the duct main body 25, and the 2nd blower outlet 29 is opened to the rear edge part of the lower wall 25b of the duct main body 25. . The intermediate duct 10 is provided with a distribution structure that distributes and supplies the cold air introduced by the damper portion 26 to the first air outlet 28 and the second air outlet 29.

  A rear chamber 43 communicating with the cold air inlet 27 of the damper portion 26 is partitioned by a partition wall 33 at the inner surface rear portion of the duct body 25. The inside of the cold air inlet 27 and the rear chamber 43 is divided into a first duct 31 at the center of the left and right and a second duct 32 on both the left and right sides by partition walls 34 arranged on the left and right of the rear surface of the partition wall 33. The partition wall 33 facing the first duct 31 is formed with a ventilation hole 40 for supplying the cool air in the first duct 31 to the first outlet 28, and the lower wall of the rear chamber 43 facing the second duct 32. The 2nd blower outlet 29 is opened to 25b. The distribution structure includes a first duct 31 that supplies cold air to the first air outlet 28 and a second duct 32 that supplies cold air to the second air outlet 29.

  The third outlet 30 is opened in the lower wall 25 b of the rear chamber 43 facing the first duct 31.

  When the opening area of the 3rd blower outlet 30 is set to 1, the opening area of the vent hole 40 is set to 1-3.

  The first duct 31 includes a first inlet 37 that introduces cold air into the first duct 31, and the second duct 32 includes a second inlet 38 that introduces cold air into the second duct 32. When the opening area of the second introduction port 38 is 1, the opening area of the first introduction port 37 is set to 1-2.

  In the present invention, in a two-temperature type showcase in which the inside of the display chamber 3 is divided into a lower low temperature area A1 and an upper high temperature area A2 by an intermediate duct 10, an air curtain is provided in the low temperature area A1. The 1st blower outlet 28 to form was opened over the right-and-left end of the front edge part of the lower wall 25b of the duct main body 25. FIG. In addition, a second air outlet 29 that blows out cool air toward the inside of the low temperature area A <b> 1 was opened at the rear edge of the lower wall 25 b of the duct body 25. The intermediate duct 10 is provided with a distribution structure that distributes and supplies the cold air introduced by the damper portion 26 to the first air outlet 28 and the second air outlet 29.

  Therefore, according to the two-temperature type showcase of the present invention, an appropriate amount of cold air is surely blown out from each of the first and second blow-out ports 28 and 29, and the cold air blown out from the first blow-out port 28 is used in a low-temperature area. While the air curtain is reliably formed in A1, it is possible to supply sufficient cold air to the inside of the low temperature area A1 with the cold air blown from the second air outlet 29, so that the internal temperature of the low temperature area A1 can be maintained at the set temperature. . In addition, since cold air is blown out from the upper rear side of the low temperature area A1 farthest from the suction port 17 at the lower end front portion of the low temperature area A1, the cold air can be spread throughout the low temperature area A1, Uneven temperature in the low temperature area A1 can be eliminated. Furthermore, since the air curtain in the low temperature area A1 is reliably formed, the cold air in the low temperature area A1 can be prevented from leaking out of the showcase, and the operating time of the refrigeration equipment can be further shortened and the running cost can be reduced. .

  The inside of the cold air inlet 27 and the rear chamber 43 is divided into a first duct 31 at the center of the left and right sides and a second duct 32 at the left and right sides by a partition wall 34, and the distribution structure is sent to the first air outlet 28. It comprised with the 1st duct 31 to supply, and the 2nd duct 32 which sends cold air to the 2nd blower outlet 29. FIG. According to this, the cold air introduced from the cold air inlet 27 is distributed to the first duct 31 and the second duct 32 at a predetermined ratio, and each of the distributed cold air is distributed to the first and second outlets 28. 29 can be blown out. Therefore, sufficient cold air can be supplied to the inside of the low temperature area A1 while reliably forming the air curtain. Moreover, since the 2nd blower outlet 29 was opened to the lower wall 25b of the rear chamber 43 which faces the 2nd duct 32 of right-and-left both sides, cold air can be spread to every corner of the left-right end of low temperature area A1, and low temperature area The uneven temperature of A1 can be further eliminated. For example, when the present invention is applied to a plurality of types of showcases having different width dimensions, the ratio of cool air introduced into the first duct 31 and the second duct 32 can be freely set depending on the position where the partition wall 34 is provided. Therefore, there is an advantage that the distribution ratio of the cold air corresponding to the width dimension of the showcase can be easily set.

  Further, since the first duct 31 and the second duct 32 are divided by the partition wall 33 and the left and right partition walls 34, the passage structure is simplified and the ventilation resistance is reduced as compared with the conventional cold passage structure. The cold air can be circulated effectively by that amount. The inflow of cold air from the rear chamber 43 to the duct main body 25 side ahead of the partition wall 33 is suppressed by the partition wall 33 provided with the vent holes 40 facing the first duct 31. Thereby, the ventilation resistances of the first duct 31 and the second duct 32 are made substantially equal to prevent excessive cold air from being distributed to either the first duct 31 or the second duct 32.

  When the third air outlet 30 is opened in the lower wall 25b of the rear chamber 43 facing the first duct 31, a part of the cool air supplied to the first air outlet 28 in the first duct 31 is cooled from the third air outlet 30 to a low temperature. The air can be blown out toward the inside of the area A1, and the cold air can be blown out from the entirety of the rear edge portion of the duct body 25 in the left-right direction to the low temperature area A1. Therefore, it is possible to uniformly supply the cold air to the entire low temperature area A1 and to reliably eliminate the temperature unevenness in the low temperature area A1. In particular, in the case of a showcase having a large width in the left-right direction, a difference easily occurs between the temperature at the left and right ends of the low-temperature area A1 and the temperature at the center. By blowing out cool air to the low temperature area A1, the temperature unevenness as described above can be cleared.

  When the opening area of the 3rd blower outlet 30 is set to 1, the opening area of the vent hole 40 is set to 1-3 for the following reasons. This is because if the total opening area of the vent holes 40 is less than 1, the amount of cool air supplied to the first air outlet 28 is insufficient, and an air curtain with an appropriate wind speed cannot be formed on the front surface of the low temperature area A1. . Further, if the total opening area of the vent holes 40 exceeds 3, almost no cool air is blown out from the third outlet 30 and temperature unevenness occurs in the left and right central portions inside the low temperature area A1.

  When the opening area of the second introduction port 38 included in the second duct 32 is 1, the opening area of the first introduction port 37 included in the first duct 31 is set to 1 to 2 for the following reason. This is because if the opening area of the first introduction port 37 is less than 1, the amount of cool air supplied to the first air outlet 28 is insufficient, and an appropriate air curtain cannot be formed on the front surface of the low temperature area A1. Further, if the opening area of the first inlet 37 exceeds 2, the amount of cold air blown out from the second outlet 29 is insufficient, and temperature unevenness occurs in the low temperature area A1.

It is a bottom view of the intermediate duct in the two-temperature type showcase according to the present invention. It is a vertical side view which shows the schematic structure of a 2 temperature type showcase. It is a front view of a two-temperature type showcase. It is a vertical side view which shows the channel | path division structure of an intermediate | middle duct. It is the sectional view on the AA line in FIG.

(Example) FIGS. 1-5 shows the Example of the 2 temperature type showcase which concerns on this invention. In this embodiment, front / rear, left / right, and upper / lower follow the cross arrows shown in FIGS. 1, 2, and 3 and the front / rear, left / right, and upper / lower indications shown near each arrow. In FIG. 2, the showcase includes a main body case 1 formed of a heat-insulating box having an open front surface, an inner case 2 that is disposed inside the main body case 1 and divides the display chamber 3, and between the cases 1 and 2. A cool air passage 4 and a circulating air passage 5 are provided. Reference numeral 6 is a shelf bracket, and reference numeral 7 is a plate glass shelf. The shelf bracket 6 is fixed to the left and right ends of the shelf board 7, respectively.

  The interior of the display chamber 3 is divided into a low temperature area A1 below the intermediate duct 10 and a high temperature area A2 above the intermediate duct 10 with an intermediate duct 10 disposed in the middle of the upper and lower sides of the inner case 2. Specifically, as shown in FIG. 3, four damper openings 11 for inserting and attaching the intermediate duct 10 are formed in a multistage shape in the vertical direction at the central portion of the rear wall 2 a of the inner case 2 facing the display chamber 3. The display chamber 3 can be divided into a low temperature area A1 and a high temperature area A2 by inserting the intermediate duct 10 into one of the damper openings 11 and attaching it. The vertical heights of the low temperature area A1 and the high temperature area A2 can be changed to large or small depending on the mounting position of the intermediate duct 10 with respect to the damper opening 11 in the vertical direction. FIG. 3 shows a state where the intermediate duct 10 is attached to the second damper opening 11 from the bottom.

  As shown in FIG. 2, the cool air passage 4 includes a bottom passage 4a formed from the lower part to the rear part of the low temperature area A1, and a vertical passage 4b rising upward from the rear part of the bottom passage 4a. The circulation fan 13 is disposed in the lower portion of the vertical passage 4b, and the evaporator 14 constituting the refrigeration equipment is disposed in the lower portion of the vertical passage 4b. The vertical passage 4b is defined between the rear wall 2a of the inner case 2 and an intermediate wall 15 disposed in parallel behind the wall 2a. As shown in FIG. 5, the width of the vertical passage 4 b where the damper opening 11 is disposed is set to be smaller in the width direction in the left-right direction than the other portions. Specifically, in the longitudinal passage 4b, U-shaped partition walls 15a are provided on the left and right sides in front view so as to connect the rear wall 2a and the intermediate wall 15 (see FIG. 3). The width dimension in the left-right direction is made smaller than that of the vertical passage 4b in which the evaporator 14 is disposed by the partition wall 15a.

  The circulation air passage 5 is branched from the rear part of the bottom passage 4 a between the circulation fan 13 and the evaporator 14, is formed along the rear part and the upper part of the main body case 1, and is fed from the circulation fan 13. A part of the circulating air before heat exchange is fed and guided toward the upper outlet 16. By circulating the circulating air fed through the circulating air passage 5 from the upper outlet 16 toward the suction port 17 at the lower front part of the low temperature area A1, the front surfaces of the high temperature area A2 and the low temperature area A1 are covered. In the state, an air curtain is formed by circulating air. A heater 18 made of a sheathed heater is disposed at the upper end of the intermediate wall 15. When the internal temperature of the high temperature area A 2 is set higher than the normal temperature, the heater 18 is energized to circulate the circulating air in the circulating air passage 5. After heating, circulating air is blown out from the upper outlet 16.

  In FIG. 3, reference numeral 2 b is an opening group that blows out a part of the cold air supplied through the vertical passage 4 b of the cold air passage 4 to the low temperature area A <b> 1, and reference numeral 2 c is supplied through the circulating air passage 5. It is an opening group which blows off a part of circulating air to high temperature area A2. Note that the amount of cool air or circulating air blown out from each of the opening groups 2b and 2c is very small, and is not so large as to change the internal temperatures of the low temperature area A1 and the high temperature area A2.

  The damper opening 11 is closed by a door 20 disposed on the rear side. As shown in FIG. 4, the upper and left ends of the door 20 are supported by the support shaft 21 so as to be able to swing open and close, so that the door 20 can return to the closed position by its own weight. An oblique joining wall 20a is bent at the lower part of each door 20, and each joining wall 20a is adsorbed by a rubber magnet 23 arranged at the upper end of a receiving wall 22 provided on the rear wall 2a. The door 20 can be kept closed.

  As shown in FIG. 1 and FIG. 4, the intermediate duct 10 is formed integrally with a duct main body 25 formed in a hollow box shape and a rear end of the duct main body 25, and cool air supplied through the cold air passage 4 is received. And a damper portion 26 to be introduced into the duct body 25. The duct body 25 is composed of upper and lower walls 25a and 25b, left and right walls 25c and 25d, and front and rear walls 25e and 25f, and is formed in a hollow box shape with small vertical dimensions, and a duct is formed at the center of the rear wall 25f. An introduction opening 25g for introducing cool air into the body 25 is formed. The damper portion 26 is formed in a square lid shape with an upper wall 26a, left and right walls 26b and 26c, and a rear wall 26d, and the front and lower surfaces are open, and the front end portions of the upper wall 26a and the left and right walls 26b and 26c are The upper opening and the left and right edges of the introduction opening 25g are fixed. Thereby, the lower surface of the damper part 26 is opened as the cold air inlet 27.

  The duct body 25 is provided with a first air outlet 28 and a second air outlet 29. The 1st blower outlet 28 is opened over the right-and-left end of the front edge part of the lower wall 25b of the duct main body 25, and the 2nd blower outlet 29 is opened to the rear edge part of the lower wall 25b of the duct main body 25. . In FIG. 4, reference numeral 28 a denotes a lattice-shaped rectifying frame that directs the cold air blowing direction toward the suction port 17. By blowing the cool air fed through the cool air passage 4 from the first air outlet 28 toward the suction port 17 through the duct body 25, the air curtain by the cool air is provided behind the air curtain by the circulating air. Is formed. Therefore, a double air curtain is formed on the front side of the low-temperature area A1, that is, an air curtain made of cold air and an air curtain made of circulating air. A part of the cool air forming the air curtain is also supplied to the inside of the low temperature area A1.

  The 2nd blower outlet 29 is opened by the lower wall 25b of the rear chamber 43 which faces the 2nd duct 32 of the right-and-left both sides mentioned later. The left and right second air outlets 29 are each constituted by a group of air outlets 29a, and five oval air outlets 29a are formed in a straight line on each of the left and right sides. The cold air fed through the cold air passage 4 is blown out from the left and right second air outlets 29 at the mounting base end (rear edge) of the duct body 25 toward the inside of the low temperature area A1, so that the low temperature area A1. The cold air can be spread to every corner of the left and right ends, and temperature unevenness in the low temperature area A1 can be eliminated.

  The intermediate duct 10 is provided with a distribution structure that distributes and supplies the cold air introduced at the cold air inlet 27 of the damper portion 26 to the first air outlet 28 and the second air outlet 29. The distribution structure includes a first duct 31 that supplies cold air to the first air outlet 28 and a second duct 32 that supplies cold air to the second air outlet 29. A rear chamber 43 communicating with the cold air inlet 27 of the damper portion 26 is partitioned by a partition wall 33 at the rear of the inner surface of the duct main body 25, and the interior of the duct main body 25 is thus separated from the front chamber 42 and the rear side of the front side. It is divided into a rear chamber 43. The inside of the cold air inlet 27 and the rear chamber 43 is divided into a first duct 31 at the center of the left and right and a second duct 32 on both the left and right sides by partition walls 34 disposed on the left and right of the rear surface of the partition wall 33. Specifically, the rear chamber 43 is partitioned by a left and right partition wall 34 into a first chamber 35 at the center in the left and right and a second chamber 36 on both the left and right sides. Further, the cold air inlet 27 of the damper portion 26 is divided into a first inlet 37 at the center of the left and right and second inlets 38 on the left and right sides by the left and right partition walls 34. The first duct 31 includes a first chamber 35 and a first introduction port 37, and the second duct 32 includes a second chamber 36 and a second introduction port 38.

  The left and right partition walls 34 are fixed so as to be inclined by 45 degrees with respect to the partition plate 33, with one end contacting the partition wall 33 and the other end contacting the rear wall 26 d of the damper portion 26. Thereby, a first chamber 35 having an isosceles trapezoidal shape is defined in the left and right central portion of the rear portion of the duct body 25, and a trapezoidal second chamber 36 is defined on the left and right of the chamber 35. Similarly, an isosceles trapezoidal first introduction port 37 is divided at the left and right central portions of the cold air introduction port 27, and a trapezoidal second introduction port 38 is divided at the left and right of the introduction port 37. The cold air in the vertical passage 4b is distributed to the first and second ducts 31 and 32 in proportion to the areas of the two introduction ports 37 and 38 facing the vertical passage 4b. The partition wall 34 also serves as a guide body that guides cold air to the second chamber 36. Since the first duct 31 and the second duct 32 are separated by the partition wall 33 and the left and right partition walls 34, the passage structure can be simplified and the ventilation resistance can be reduced compared to the conventional cold air passage structure, and the cold air can be reduced accordingly. It can be circulated effectively.

  The partition wall 33 facing the first duct 31 is formed with a vent hole 40 for supplying the cool air in the first duct 31 to the first air outlet 28. The vent holes 40 are formed in an oval shape, and thirteen vent holes 40 are opened in a straight line. By connecting the rear chamber 43 and the front chamber 42 through the vent hole 40, the cold air introduced into the first duct 31 can be supplied to the front chamber 42 and blown out from the first air outlet 28. The inflow of cold air from the rear chamber 43 to the front chamber 42 side is suppressed by the partition wall 33 provided with the vent hole 40. Therefore, the ventilation resistance of the first duct 31 and the second duct 32 is made substantially equal, The cold air is prevented from being excessively distributed to either the first duct 31 or the second duct 32. Thereby, it is possible to distribute the cold air to the first and second ducts 31 and 32 in proportion to the areas of the two introduction ports 37 and 38 facing the vertical passage 4b.

  As described above, the interior of the rear chamber 43 partitioned by the cold air inlet 27 and the partition wall 33 is partitioned into the first duct 31 and the second duct 32 by the partition wall 34, and the distribution structure is separated from the first duct 31. When configured with the second duct 32, the cold air introduced from the cold air inlet 27 is distributed to the first duct 31 and the second duct 32 at a predetermined ratio, and each of the distributed cold air is first and second. It can blow out from blower outlets 28 and 29. Therefore, sufficient cold air can be supplied to the inside of the low temperature area A1 while reliably forming the air curtain.

  The first introduction port 37 and the second introduction port 38 divided by the left and right dividing walls 34 have an opening area of the first introduction port 37 of 1 when the total opening area of the left and right second introduction ports 38 is 1. It is preferable to set to ~ 2. This is because if the opening area of the first introduction port 37 is less than 1, the amount of cool air supplied to the first air outlet 28 is insufficient, and an appropriate air curtain cannot be formed on the front surface of the low temperature area A1. Moreover, when the opening area of the 1st inlet 37 exceeds 2, the quantity of the cool air blown off from the 2nd blower outlet 29 will run short, and temperature unevenness will arise inside the low temperature area A1. More preferably, the opening area of the first introduction port 37 may be set to 1.4 to 1.8. In this embodiment, when the total opening area of the second introduction ports 38 is 1, the opening area of the first introduction port 37 is set to 1.6. Therefore, about 62% of the cold air introduced into the duct body 25 at the cold air inlet 27 is introduced into the first duct 31 and the remaining 38% is introduced into the second duct 32.

  As shown in FIGS. 4 and 5, a third outlet 30 is opened in the lower wall 25 b facing the first chamber 35 of the first duct 31. The 3rd blower outlet 30 is comprised by the group of blower openings 30a formed along the left-right direction. The blowing openings 30a are formed in the same shape as the blowing openings 29a, and twelve blowing openings 30a are opened in a straight line. Thereby, a part of cold air sent to the 1st blower outlet 28 with the 1st duct 31 can be blown out toward the inside of low temperature area A1 from the 3rd blower outlet 30, and the right-and-left direction of duct body 25 is made. Cold air can be supplied to the low temperature area A1 from the whole. Therefore, it is possible to uniformly supply the cold air to the entire low temperature area A1 and to reliably eliminate the temperature unevenness in the low temperature area A1. In particular, in the case of a showcase having a large width in the left-right direction, a difference easily occurs between the temperature at the left and right ends of the low-temperature area A1 and the temperature at the center. By blowing out cool air to the low temperature area A1, the temperature unevenness as described above can be cleared.

  The group of outlet openings 29a that constitute the second outlet 29 and the group of outlet openings 30a that constitute the third outlet 30 are formed in the same axis. The adjacent pitch of the blowout openings 29a is different from the adjacent pitch of the blowout openings 30a, and the adjacent pitch of the blowout openings 30a is set to be larger than the adjacent pitch of the blowout openings 29a. This is because if the adjacent pitch of the blowout openings 30a is set to be the same as or smaller than the adjacent pitch of the blowout openings 29a, the total opening area of the blowout openings 30a becomes large, and the cool air blown from the first blowout opening 28 and the third This is because it is difficult to appropriately adjust the balance with the cool air blown from the blower outlet 30.

  When the total opening area of the outlet openings 30a of the third outlet 30 is 1, it is preferable to set the total opening area of the vent holes 40 to 1 to 3. This is because if the total opening area of the vent holes 40 is less than 1, the amount of cool air supplied to the first air outlet 28 is insufficient, and an air curtain with an appropriate wind speed cannot be formed on the front surface of the low temperature area A1. . Further, if the total opening area of the vent holes 40 exceeds 3, almost no cool air is blown out from the blowout opening 30a, and temperature unevenness occurs in the left and right central portions inside the low temperature area A1. More preferably, the total opening area of the vent holes 40 may be set to 1.5 to 2.5. In this embodiment, when the total opening area of the outlet openings 30a of the third outlet 30 is 1, the total opening area of the vent holes 40 is set to 2. Accordingly, about 41% of the cold air introduced from the cold air inlet 27 into the duct body 25 is from the first outlet 28, about 38% is from the second outlet 29, and about 21% is the outlet of the third outlet 30. It will be blown from 30a.

  As shown in FIGS. 3 and 5, the left-right width of the duct body 25 is set slightly smaller than the left-right width of the shelf 7, and the left-right width of the damper portion 26 is slightly smaller than the left-right width of the damper opening 11. Is set. On the rear wall 26d of the damper portion 26, a seal body 44 provided with a magnet that closes a gap between the intermediate wall 15 and the intermediate wall 15 is fixed. The rear wall 25f of the duct body 25 has a seal wall 25h extending downward, and a sponge seal 45 is provided so as to surround the left and right sides and the lower side of the front end of the damper portion 26 (see FIG. 4). As a result, in a state where the damper portion 26 is inserted into and installed in the damper opening 11, the gap between the rear wall 26 d of the damper portion 26 and the intermediate wall 15 is sealed with the sealing body 44, and the left and right sides of the damper portion 26 and the damper opening 11 are sealed. The lower gap is sealed with a sponge seal 45, and the cold air in the cold air passage 4 leaks into the vertical passage 4b above the damper portion 26 and the inside of the low temperature area A1 through the both gaps. It is preventing.

  In order to support the intermediate duct 10 inserted into the damper opening 11 in a stable state, a support structure and a coupling structure that engage with each other are provided between the left and right side walls of the duct body 25 and the shelf bracket 6. . The support structure includes a wing piece 46 provided on the left and right side walls of the duct body 25 and a support piece 47 provided integrally with the shelf bracket 6 and receiving the wing piece 46. The connection structure includes a male connection body 48 fixed to the left and right side walls of the duct body 25 and a horizontal V-shaped female connection body 49 fixed to the shelf bracket 6. Both coupling bodies 48 and 49 are each formed of a plastic molded product.

  When the rear end of the damper part 26 of the intermediate duct 10 is inserted into the damper opening 11 while being pressed against the door 20, the door 20 is opened and swung as shown in FIG. 4 so that the damper part 26 is positioned in the cold air passage 4. Can be made. The damper portion 26 divides the vertical passage 4 b of the cold air passage 4 into upper and lower portions, and the seal body 44 in this state is in contact with the intermediate wall 15. Therefore, the cold air after heat exchange supplied to the cold air passage 4 is introduced into the duct body 25 from the cold air inlet 27 of the damper portion 26. The cold air introduced into the first duct 31 is blown out from the first air outlet 28 and the third air outlet 30 to supply the cold air to the inside of the low temperature area A1 while forming a cold air curtain. Moreover, the cold air introduced into the second duct 32 is blown out from the second air outlet 29 to supply the cold air to the inside of the low temperature area A1.

  As described above, when the cold air inlet 27 of the duct body 25 is provided with a distribution structure, the cold air introduced from the cold air inlet 27 is supplied to the first air outlet 28 and the second air outlet 29 in a distributed state. An appropriate amount of cold air can be reliably blown out from each of the outlets 28 and 29. Accordingly, the cool air blown from the first air outlet 28 reliably forms an air curtain in the low temperature area A1, while the cool air blown from the second air outlet 29 supplies sufficient cold air to the inside of the low temperature area A1 to reduce the temperature. The internal temperature of the area can be maintained at the set temperature. In addition, since cold air is blown out from the upper rear side of the low temperature area A1 farthest from the suction port 17 at the lower end front portion of the low temperature area A1, the cold air can be spread throughout the low temperature area A1, Uneven temperature in the low temperature area A1 can be eliminated. Furthermore, since the air curtain is reliably formed in the low temperature area A1, it is possible to prevent the cold air in the low temperature area A1 from leaking out of the showcase, thereby shortening the operation time of the refrigeration equipment and reducing the running cost. .

  In the two-temperature type showcase configured as described above, tea, juice, carbonated beverages, and the like can be cooled by maintaining the internal temperature of the low temperature area A1 at a low temperature. In addition, the internal temperature of the high temperature area A2 is maintained at a normal temperature to prevent the rice balls and lunch boxes from being cooled. The two-temperature type showcase can be used as a refrigerated showcase by removing the intermediate duct 10 so that the entire display chamber 3 is made into a low temperature area A1. In that case, all the damper openings 11 are closed by the doors 20, so that the cold air fed into the cold air passage 4 can be circulated to the circulation air passage 5 and blown out from the upper outlet 16. it can. When the showcase is used as a refrigerated showcase, the heater 18 is not energized.

  In the above-described embodiment, the left and right partition walls 34 are arranged in a letter C shape so as to be inclined with respect to the partition wall 33, but may be arranged so as to be orthogonal to the partition wall 33. The inside of the mouth 27 and the rear chamber 43 may be divided into the first duct 31 and the second duct 32. Although the circulating air is heated by the heater 18, the heater 18 can be omitted when it is not necessary to heat the circulating air. In addition, the circulating air may be heated using a planar heater or a nichrome wire heater as a heat source instead of the sheathed heater. The evaporator 14 can be arrange | positioned in the up-and-down several places of the vertical channel | path 4b. Since the opening shape and arrangement pattern of the 2nd blower outlet 29 can be set freely, it is not limited to the opening shape and arrangement pattern which were demonstrated in the Example. The shelf plate 7 may be formed of a metal plate material or a plastic plate material in addition to the plate glass.

DESCRIPTION OF SYMBOLS 1 Main body case 2 Inner case 3 Display chamber 4 Cold air passage 10 Intermediate | middle duct 11 Damper opening 17 Suction port 25 Duct main body 25b Lower wall 26 Damper part 27 Cold air inlet 28 1st outlet 29 2nd outlet 30 3rd outlet 31 First duct 32 Second duct 33 Partition wall 34 Partition wall 37 First inlet 38 Second inlet 40 Ventilation hole A1 Low temperature area A2 High temperature area

Claims (5)

It has a main body case (1) and an inner case (2) that partitions the display chamber (3), and has a plurality of damper openings (11) on the rear wall (2a) of the inner case (2) facing the display chamber (3). ) Are arranged in multiple stages,
In the intermediate duct (10) that is inserted into and installed in any one of the damper openings (11), the inside of the display chamber (3) is divided into a low temperature area (A1) on the lower side and a high temperature area (A2) on the upper side. A two-temperature showcase
The intermediate duct (10) is formed integrally with the duct main body (25) formed in a hollow box shape and the rear end of the duct main body (25), and cool air in the cold air passage (4) is transferred to the duct main body (25). And a damper part (26) to be introduced into the
A first air outlet (28) that blows out cool air toward the duct body (25) toward the suction port (17) at the lower end front portion of the low temperature area (A1) to form an air curtain in the low temperature area (A1), and a low temperature A second outlet (29) for blowing out cool air toward the inside of the area (A1),
The first outlet (28) is opened over the left and right ends of the front edge of the lower wall (25b) of the duct body (25), and the second outlet (29) is the lower wall of the duct body (25). (25b) is open at the rear edge,
The intermediate duct (10) is provided with a distribution structure for distributing and feeding the cold air introduced by the damper portion (26) to the first air outlet (28) and the second air outlet (29). A characteristic two-temperature showcase. A rear chamber (43) communicating with the cold air inlet (27) of the damper portion (26) is partitioned by a partition wall (33) at the inner surface rear portion of the duct body (25),
The inside of the cold air inlet (27) and the rear chamber (43) is a partition wall (34) disposed on the left and right of the rear surface of the partition wall (33). It is divided into two ducts (32),
The partition wall (33) facing the first duct (31) is formed with a vent hole (40) for supplying the cool air in the first duct (31) to the first outlet (28). A second outlet (29) is opened in the lower wall (25b) of the rear chamber (43) facing the duct (32),
The distribution structure is composed of a first duct (31) for supplying cold air to the first air outlet (28) and a second duct (32) for supplying cold air to the second air outlet (29). The two-temperature type showcase according to claim 1.   The two-temperature type showcase according to claim 2, wherein the third outlet (30) is opened in the lower wall (25b) of the rear chamber (43) facing the first duct (31).   The two-temperature showcase according to claim 3, wherein when the opening area of the third outlet (30) is 1, the opening area of the ventilation hole (40) is set to 1 to 3. The first duct (31) includes a first inlet (37) that introduces cold air into the first duct (31), and the second duct (32) introduces cold air into the second duct (32). A second inlet (38),
The two-temperature equation according to any one of claims 2 to 4, wherein when the opening area of the second introduction port (38) is 1, the opening area of the first introduction port (37) is set to 1 to 2. Showcase.

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