JPH04281175A - Open showcase - Google Patents

Abstract

PURPOSE:To eliminate a negative pressure generated on the surface of a ceiling plate by providing cold air discharging ports at places near the ceiling plate of a back plate and below the back plate of a detachable shelf, in an open showcase whose inside is cooled by air curtain and the cold air discharged out of the cold air discharging port provided on the back plate of the lower surface of the case. CONSTITUTION:Air curtain is formed by a method wherein cold air, effecting heat exchange in a cooler 5a, is discharged out of a cold air discharging port 8 provided at the fore end of a case ceiling plate 7 by a cooling fan 4 against a cold air sucking port 10 provided at the fore end of a deck pan 9. On the other hand, cold air is discharged out of cold air discharging ports H1, H2, provided on the back plate 11 of the lower surface of the case to cool the inside of the case. In such an open showcase, one row of cold air discharging ports H3 are provided above the back plate 11 of the uppermost detachable shelf S1 along the total width of the case. Further, two rows of cold air discharging ports H4 are provided on the back plate 11 between the shelf S1 and the shelf S2 nearest to the cold air discharging port 8 along the total width of the case. According to this method, cooling in the case can be effected uniformly.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open showcase that cools the inside of the case by blocking outside air with an air curtain of cooling air.

0002

2. Description of the Related Art A conventional open showcase (hereinafter referred to as a case) 1 is provided with a compressor 3 and a condenser 4 in the lower part of a machine room 2, and a cooler 5 on the back of the case, as shown in FIG. By providing this, a refrigerant circuit is constructed.

[0003]The cold air shown by the arrow that has undergone heat exchange in the cooler 5 is discharged from a cold air outlet 8 provided at the front end of the case top plate 7 by a cooling fan 6 provided at the top of the machine room 2. The cold air is sucked in from a cold air intake port 10 provided at the front end of the deck pan 9. This flow of cold air forms an air curtain at the front opening of the case 1.

Further, for example, if this case 1 is equipped with three removable shelves, the three shelves S of the case 1
1, S2, S3 and the deck pan 9, the cooling effect of the respective spaces of the lowest shelf S3 and the deck pan 9 which are far from the cold air outlet 8 decreases. Therefore, this cold air is transferred to the upper part of the back plate 11 of the lowest shelf S3 and the cold air discharge hole H1 provided in the upper part of the back plate 11 of the deck pan 9, respectively.
, H2 to improve the cooling effect below the case.

[0005]

[Problems to be Solved by the Invention] However, if the top shelf S1 of the case 1 is removed for reasons such as enhancing the display effect, the cold air outlet 8 is connected to the cold air outlet 8. The distance from the nearest shelf S2 increases. As described above, when the distance between the cold air outlet 8 and the shelf increases, the negative pressure generated near the surface of the top plate 7 due to the discharge of cold air from the cold air outlet 8 causes the Coanda effect.

[0006] When this Coanda effect occurs, the cold air forming the air curtain reaches the shelf S closest to the cold air outlet 8.
Since the air is drawn in the second direction, disturbances occur in the air curtain. When the air curtain is disturbed, the air temperature below the case increases, and cool air is discharged from the cold air discharge holes H1 and H2 provided above the back plate 11 of the bottom shelf S3 and above the back plate 11 of the deck pan 9, respectively. There is a problem in that the inside of the case cannot be uniformly cooled even by the discharge of cold air.

SUMMARY OF THE INVENTION An object of the present invention is to provide an open showcase that can uniformly cool the inside of the case even if the cold air outlet and the shelf are far apart.

[0008]

[Means for Solving the Problems] The present invention provides an open display system equipped with an air curtain that blocks outside air and a removable shelf that cools the inside of the case with cold air discharged from cold air discharge holes provided on the back plate at the bottom of the case. In the case, the cold air discharge holes are provided near the top plate of the back plate of the case and below the back plate of the shelf that is removed above the case.

[0009]

[Operation] With this configuration, cold air can be discharged from the cold air discharge holes provided near the top plate of the back plate of the case and below the back plate of the shelf that is to be removed above the case. This discharged cold air eliminates the negative pressure generated on the surface of the top plate and prevents the air curtain from being disturbed.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of an open showcase according to an embodiment of the present invention, and FIG. 2 is a front view thereof. 1 and 2, the same reference numerals as in FIGS. 3 and 4 indicate the same or corresponding parts, and the top shelf S1 of the case 1 is now removed.

In FIGS. 1 and 2, above the back plate 11 of the top shelf S1 of the removed case 1, there is a
A row of cold air discharge holes H3 is provided over the entire width of the case. Also, the removed shelf S1 below the removed shelf S1
Two rows of cold air discharge holes H4 are provided across the entire width of the case on the back plate 11 between the shelf S2 and the shelf S2 closest to the cold air discharge port 8.

Furthermore, a cooler 5a having the full height of the back surface of the case 1 is provided on the back surface of the case 1 in order to cool the inside of the case more uniformly. Note that 12 is a fluorescent lamp that illuminates the inside of the case 1, and 13 is a fan that cools the condenser 4.

[0014] In a case configured in this way,
The cold air heat-converted by the cooler 5a is discharged from the cold air discharge port 8. In addition, this cold air is distributed to the cold air discharge hole H3 near the top plate 7, the cold air discharge hole H4 provided below the removed shelf S1, the upper part of the back plate 11 of the bottom shelf S3, and the back plate of the deck pan 9. Cold air is discharged from respective cold air discharge holes H1 and H2 provided above 11.

[0015] Here, each cold air discharge hole H1, H2, H
3. In the case of this embodiment, the wind speed of the cold air discharged from H4 is 2.5 m/s at the cold air discharge hole H3 near the top plate 7, and 2.5 m/s at the cold air discharge hole below the removed shelf S1. 0.6 m/s for H4, 0.8 m/s for cold air discharge hole H1 above the back plate 11 of the bottom shelf S3, and 0.8 m/s for the deck pan 9.
1.0 m/s at the cold air discharge hole H2 above the back plate 11.
It becomes.

[0016] As the cold air having such wind speed is discharged from the cold air discharge hole H3 near the top plate 7,
Negative pressure generated near the surface of the top plate 7 is eliminated. Also,
By discharging cold air from the cold air discharge hole H4 provided below the removed shelf S1, it is possible to prevent the air curtain from being drawn in the direction of the shelf S2 closest to the cold air discharge hole opening 8.

Therefore, the cold air discharged from the cold air discharge port 8 is caused by the cold air discharged from the cold air discharge hole H3 near the top plate 7 and the cold air discharge hole H4 provided below the removed shelf S1. An air curtain is formed by drawing in the cold air directly from the cold air suction port 10 without being drawn in the direction of the shelf S2 closest to the cold air discharge hole H3.

In addition, the cold air discharged from these two cold air discharge holes H3 and H4 not only prevents the occurrence of the Coanda effect, but also prevents the occurrence of the Coanda effect, as well as the upper part of the back plate 11 of the bottom shelf S3 and the back plate 11 of the deck pan 9. Each discharge hole H provided above
1. Together with the cold air from H2, it serves to uniformly cool the inside of the case 1.

Note that when the top shelf S1 is attached, the amount of cold air discharged from these two cold air discharge holes H3 and H4 is small, so that it will not cause disturbance to the air curtain. do not have.

[0020] In this way, by providing the cold air outlet near the top plate and below the removed shelf over the entire width of the case, the Coanda effect can be generated even if the distance from the shelf closest to the cold air outlet is large. can be prevented.

In addition, in this embodiment, the cold air discharge holes provided near the top plate are in one row, and the cold air discharge holes provided below the removed shelf are in two rows, but this effectively eliminates the Coanda effect. The number of rows may be any number as long as it can prevent the occurrence of the problem and uniformly cool the inside of the case.

[0022]

[Effects of the Invention] As described above, according to the present invention, cold air can be discharged from the cold air discharge holes provided near the top plate of the back plate of the case and below the back plate of the shelf that is to be removed above the case. . This discharged cold air can eliminate the negative pressure generated on the surface of the top plate, prevent the air curtain from being disturbed, and uniformly cool the inside of the case.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an open showcase according to an embodiment of the present invention.

[Fig. 2] Front view of an open showcase according to an embodiment of the present invention.

FIG. 3 is a side sectional view of a conventional open showcase.

[Figure 4] Front view of conventional open showcase

[Explanation of symbols] 1 Open showcase 7 Top plate 8 Cold air outlet 11 Back plate S Shelf H Cold air outlet

Claims (1)

[Claims] Claim 1: In an open showcase equipped with an air curtain that blocks outside air and a removable shelf that cools the inside of the case with cold air discharged from cold air discharge holes provided on the back plate at the bottom of the case, An open showcase characterized in that the cold air discharge hole is provided near the top plate and below the back plate of the shelf that is removed above the case.