JP3015622B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of disposing a heat conduction box at intervals in an insulated box, and circulating cool air within this interval to indirectly cool a storage room in the heat conduction box. It relates to a cold storage.

[0002]

2. Description of the Related Art Conventionally, this kind of low-temperature storage is, as shown in, for example, Japanese Patent Application Laid-Open No. 2-279970 (F25D17 / 08), provided with a heat conduction box at intervals in an insulated box opened to the front. The heat conduction box is used as a storage room, and the evaporator and blower of the cooling unit are arranged in the space between the heat conduction box and the heat insulation box, and the cool air cooled by the evaporator is supplied to the blower. The storage chamber is indirectly cooled by forced circulation within the interval.

According to such a low-temperature storage, since the inside of the storage room is cooled by the upper, lower, left and right and rear wall surfaces of the heat conduction box, and there is no direct invasion of dry cold air into the storage room, drying in the storage room is suppressed. , Its humidity can be kept high.
Therefore, it was suitable for storing fresh foods and cooked dishes at a low temperature without drying.

[0004]

In a hotel, restaurant, or the like, it is necessary to temporarily store food cooked in a kitchen in a high-humidity storage room until the food is provided to a customer. However, since the conventional low-temperature storage was opened only on the front side, it was necessary to take out and store cooked food from the same direction, and to provide food to customers and replenish food to the storage room smoothly. There was a problem that could not be done.

[0005] Therefore, if the low-temperature storage is configured to be opened on the front and rear surfaces, it is possible to store the food from one opening and take it out from the other opening, so that the above problem can be solved. Since both the front and rear surfaces of the box are opened, indirect cooling from the opening is impossible, so that the cooling effect in the storage room is inevitably reduced, and there is a problem that a temperature distribution occurs in the storage room. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and an object of the present invention is to improve the cooling performance of a storage room in an indirectly-cooled low-temperature storage which is opened front and rear. .

[0007]

That is, the low-temperature storage 1 according to the first aspect of the present invention comprises a heat insulating box 6 having openings 7 and 8 on the front and rear surfaces, and a front and rear opening 7 and 8 of the heat insulating box 6. Doors 44 and 46 that are respectively closed openably and closably, and have openings on front and rear surfaces,
It is arranged in the heat insulation box 6 at intervals, and the inside is the storage room 3.
1 and 32 and the heat conduction boxes 2 and 2
A cool air passage 39 formed between the heat conduction boxes 21 and 22 and the heat insulating box 6 on the upper, lower, left and right sides of the first and second heat exchangers 1, and an evaporator 33 and an evaporator blower 34 of a cooling device disposed in the cool air passage 39; The indirect cooling of the storage chambers 31 and 32 is performed by forcibly circulating the cool air cooled by the evaporator 33 into the cool air passage 39 by the evaporator blower 34. A duct plate 5 disposed in the storage rooms 31 and 32 with an interval from a top wall and side walls of the boxes 21 and 22;
A blower for internal circulation 20 provided between the top wall 25 of the duct plate 5 and the top walls of the heat conduction boxes 21 and 22; a discharge port 30 formed around the side wall 26 of the duct plate 5; 5 and a suction port 35 formed before and after the top wall 25.

Further, the low-temperature storage 1 according to the second aspect of the present invention
A heat insulating box 6 having openings 7 and 8 on the front and rear surfaces, doors 44 and 46 for opening and closing the front and rear openings 7 and 8 of the heat insulating box 6 respectively, and an insulating box having openings on the front and rear surfaces Heat conduction boxes 21 and 22 disposed at intervals in the body 6 and having storage chambers 31 and 32 therein, and heat conduction boxes 21 and 22 on the upper, lower, left and right sides of the heat conduction boxes 21 and 22. And a cool air passage 39 formed between the heat insulating box 6 and a cooling device evaporator 33 and an evaporator blower 34 disposed in the cool air passage 39,
The cool air cooled by the evaporator 33 is forcibly circulated into the cool air passage 39 by the evaporator blower 34, thereby indirectly cooling the inside of the storage chambers 31 and 32. Storage room 3 with a distance from the ceiling and side walls
1 and 32, the duct plate 5
And a blower 20 for circulating in the refrigerator provided between the heat conduction boxes 21 and 22, and a discharge port 30 and a suction port 35 formed in the duct plate 5. The top wall 25 of the duct plate 5 It is inclined downward on both sides with the approximate center at the top.

[0009]

According to the low-temperature storage according to the first aspect of the present invention, the door is provided.
Since the insides of the storage chambers 31 and 32 are opened in the front-back direction by opening the doors 4 and 46, articles can be stored from one side and taken out from the other side. Therefore, provision of articles such as cooked dishes and replenishment to the storage rooms 31 and 32 can be performed smoothly. Further, since the inside of the storage chambers 31 and 32 is indirectly cooled from the upper, lower, left and right surfaces of the heat conduction boxes 21 and 22 other than the front and rear openings, foods such as dishes stored in the storage chambers 31 and 32 are provided. Can be favorably stored at a low temperature without drying.

[0010] In particular, in the storage rooms 31 and 32,
The duct plate 5 is disposed at a distance from the top wall and the side wall of the duct plates 1 and 22, and the top wall 25 of the duct plate 5 and the heat conduction boxes 21 and 22 are provided.
Cool air is discharged from outlets 30 formed around the side walls 26 of the duct plate 5 into the storage chambers 31 and 32 by the internal circulation blower 20 provided between the top walls of the duct plate 5. Cool air circulation drawn from the suction port 35 formed around 25 is formed. Accordingly, heat exchange with the top wall and the side wall surface of the heat conduction boxes 21 and 22 is promoted, whereby the humidity in the storage rooms 31 and 32 is improved, and the storage room 3 is improved.
Since a cold air flow is generated at the front and rear portions of the storage chambers 1 and 32, the heat distribution from the doors 44 and 46 can be blocked to improve the temperature distribution. Cold air flow does not hit and their drying is suppressed.

According to the low-temperature storage 1 of the second aspect of the present invention, the storage chambers 31, 3 are opened by opening the doors 44, 46 in the same manner.
Since the inside of 2 is opened in the front-back direction, articles can be stored from one side and taken out from the other side. Therefore, provision of articles such as cooked dishes and replenishment to the storage rooms 31 and 32 can be performed smoothly. In addition, storage room 3
The inside of the storage compartments 31, 32 is indirectly cooled from the upper, lower, left and right surfaces of the heat conduction boxes 21, 22, except for the front and rear openings, so that the food such as dishes stored in the storage compartments 31, 32 is dried. And can be stored at a low temperature.

In particular, in the storage chambers 31, 32, the heat conduction box 2
A duct plate 5 is arranged with a space between the top wall and the side wall of the ducts 1, 22, and a storage room 31 is provided by the internal circulation blower 20 provided between the duct plate 5 and the heat conduction boxes 21, 22. , 32, cool air is discharged from a discharge port 30 formed in the duct plate 5 to form a cool air circulation sucked from a suction port 35. Therefore, heat exchange with the wall surfaces of the heat conduction boxes 21 and 22 is promoted, whereby the humidity in the storage rooms 31 and 32 can be improved, and the temperature distribution in the storage rooms 31 and 32 is also improved. Also, since the top wall 25 of the duct plate 5 is inclined low on both sides with the substantially central portion as the apex, the top wall 2 of the duct plate 5
5 The dew attached to the lower surface smoothly flows to both sides. Therefore, the storage room 31 below the top wall 25 of the duct plate 5,
The inconvenience that the dew condensation water concerning the food stored in the inside 32 drops can be solved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical front view of the low-temperature storage 1 of the present invention, FIG. 2 is a vertical side view of the low-temperature storage 1, and FIG. The low-temperature storage 1 of the present invention is installed in, for example, a kitchen of a restaurant, and includes a heat insulating box 6 in which a heat insulating material 4 is filled between inner and outer boxes 2 and 3. The heat-insulating box 6 has front and rear openings 7 and 8, and one side portion of the top wall 6 </ b> A is formed to protrude upward to form a protruding portion 9. A chamber 11 is configured.

The front and rear openings 7 and 8 of the heat-insulating box 6 are vertically divided by horizontal partition members 50 (shown in FIG. 5), and left and right by vertical partition members 12 and 13, respectively. A mounting plate 14 is provided between the horizontal partition members 50 to partition the inside of the heat insulating box 6 up and down. Inside and outside of the vertical partition members 12 and 13, upper and lower outside air introduction passages 16 and 17 are formed. The upper ends of the outside air introduction passages 18 and 19 formed in the top wall 6 </ b> A of the heat insulation box 6 are outside the heat insulation box 6. Are in communication with each other.

Inside the heat insulation box 6, upper and lower heat conduction boxes 21 and 22 formed of a heat conductive material such as stainless steel and opened to the front and rear are provided at a predetermined distance from the inner surface of the heat insulating box 6, respectively. It is stored and arranged above and below. At this time, the lower heat conduction box 22 is located below the mounting plate 14 at the bottom wall 6 of the heat insulating box 6.
B is fixed on the mounting plate 23 provided on the top surface of B at a distance from the bottom wall 6B, and the upper heat conduction box 21 is mounted on the mounting plate 14 with the mounting plate 24 spaced from the mounting plate 14. Fixed. The front and rear opening edges of the upper and lower heat conduction boxes 21 and 22 are in contact with the inner surface of the heat insulation box 6. Isolated from the space between the heat conduction boxes 21 and 22, and
Upper and lower storage chambers 31 and 32 open front and rear are formed.

On the other hand, an evaporator 33 constituting a cooling device and a blower 34 for the evaporator are housed and arranged in the cooling chamber 11, and the heat insulating box 6 on the side of the overhang portion 9 is provided on the top wall 6A. Similarly, a compressor 36, a condenser 37, and a condenser blower 38 which constitute a cooling device are provided. Also, the mounting plate 14
The through holes 14 are provided on both sides of the
A, 23A, 24A are drilled, whereby
A series of cold air passages 39 are formed between the upper and lower heat conduction boxes 21 and 22 and the heat insulating box 6 and between the upper and lower heat conduction boxes 21 and 22.

The cooling chamber 11 is provided in the cold air passage 39.
In the lower part of the side wall of the overhang portion 9 on the side of the condenser 37, a cool air passage 39 above the upper heat conduction box 21 in a range extending from the front end of the heat insulating box 6 to the rear edge of the evaporator 33. And evaporator 33
A cover 41 for closing the rear surface is attached. Further, a space communicating with the cool air passage 39 is formed above the evaporator 33, and the blower 34 is arranged below the evaporator 33. With such an arrangement, the blower 34 is positioned above one side of the upper heat conduction box 21, and the blowout side (one upper corner of the upper heat conduction box 21) of the blower 34 is used as the outlet 42 and the upper heat The other upper corner portion of the good conductor box 21 is a suction port 43. Therefore, the cover 41 is in the form of partitioning the outlet 42 and the inlet 43.

On the other hand, duct plates 5 as shown in FIG. 4 are mounted in the upper and lower storage chambers 31, 32, respectively (note that the duct plates 5 in the upper and lower storage chambers 31, 32 are the same, so that Only the chamber 31 will be described). This duct plate 5 is similarly assembled with a heat conductive plate made of stainless steel or the like, and a top wall 25, left and right side walls 26,
26, and front and rear walls 27 and 28 formed by raising the front and rear edges of the top wall 25. Outward flanges 29 are formed on the front and rear edges of the left and right side walls 26, 26, respectively.
Each flange 29 is formed with a discharge port 30 formed of a plurality of round holes formed vertically and facing frontward and rearward.

The top wall 25 is inclined low on both sides with the approximate center at the apex due to the combination of the two stainless steel plates, and the bottom edges of the left and right side walls 26, 2
6 is connected to the upper end. And the front and rear walls 27, 28
Is formed flush with the flange 29, and an upper portion thereof is formed with a suction port 35 formed of a plurality of round holes formed in the left and right directions, facing the front and rear. In addition, the front and rear walls 27, 28
On both sides in between, blowers 20 for internal circulation are mounted by mounting plates 15, 15, respectively.

In the duct plate 5, the front and rear edges of the left and right side walls 26 and 26 and the left and right edges of the front and rear walls 27 and 28 are arranged on the left and right side walls of the upper heat conduction box 21, and the upper edges of the front and rear walls 27 and 28 are heated. By fixing to the top wall of the good heat conduction box 21, it is attached to the upper heat good heat conduction box 21 (the same applies to the lower heat good heat conduction box 22). At this time, the top wall 25 has an interval below the top wall of the upper heat conduction box 21, and the left and right side walls 26, 26 face each other with an interval inside the left and right side walls of the upper heat conduction box 21. As a result, a series of ducts 51 are formed between the duct plate 5 and the upper heat conduction box 21 from the top to the left and right sides and separated from the upper storage chamber 31. Blowers 20, 20
Duct 51 between the top wall 25 and the top wall of the upper heat conduction box 21
It is a form that is located inside.

The discharge ports 30 and the suction ports 35 are located near the inside of the openings 7 and 8 of the heat insulating box 6. On the other hand, an outside air discharge port 53 corresponding to the suction port 35 of the front wall 27 of the duct plate 5 of the lower heat conduction box 22 is formed in the outside air introduction passage 16 in the vertical partition member 12. Inside air introduction passages 17 are formed with outside air discharge ports 54, 54 corresponding to the suction ports 35, 35 of the rear walls 28, 28 of the duct plates 5, 5 of the upper and lower heat conduction boxes 21, 22.

The front and rear openings 7 and 8 of the heat insulating box 6 are closed by opening and closing heat insulating doors 44, 44, 46 and 46, respectively, for example. The low-temperature storage 1 is installed between the kitchen and the customer seat, the front opening 7 is on the kitchen side, and the rear opening 8 is on the customer side. Compressor for cooling system 3
6 and the evaporator blower 34 are operated, the evaporator 33
The cool air cooled by the above is sucked downward by the evaporator blower 34 and is blown downward from the outlet 42. The cool air blown out from the outlet 42 flows into the cool air passage 39 on one side of the upper heat conduction box 21 as shown by the thin arrow in FIG. 1 and flows down there. After passing through 14A, it flows into the cold air passage 39 on one side of the lower heat conduction box 22 as it is, and the remainder flows into the cold air passage 39 between the upper and lower heat conduction boxes 21 and 22.

The cold air flowing into the cold air passage 39 on one side of the lower heat conduction box 22 flows into the cold air passage 39 below the lower heat conduction box 22, and then passes through the through holes 23A, 23A to be cooled. The heat flows into the cool air passage 39 on the other side of the heat conduction box 22. The cool air flowing into the cold air passage 39 on the other side of the lower heat conduction box 22 rises there and flows into the cold air passage 39 on the other side of the upper heat conduction box 21 from the through hole 14A. And the upper and lower heat conduction boxes 21, 2
The cold air that has passed through the cold air passage 39 between the two is joined in the cold air passage 39 on the other side of the upper heat conduction box 21, and the cool air above the upper heat conduction box 21 from the suction port 43. It flows into the passage 39.

The cool air flowing into the cool air passage 39 above the upper heat conduction box 21 flows from the other side of the upper heat conduction box 21 to one side rear and rises in the cooling chamber 11 behind the evaporator 33. Then, it returns to the evaporator 33 from above the evaporator 33. By such a series of forced circulation of the cool air, the cool air from the evaporator 33 flows along substantially the entire upper, lower, left and right surfaces of the upper and lower heat conduction boxes 21 and 22. Therefore, the air in the upper and lower storage chambers 31 and 32 is cooled by the upper, lower, left and right walls of the upper and lower heat conduction boxes 21 and 22.

In the upper and lower storage chambers 31, 32, dishes cooked in the kitchen are stored through the front opening 7 with the door 44 opened. The prepared dishes are stored in the upper and lower storage rooms 31,
32, the waiter opens the door 46 after receiving an order, or in accordance with the progress of a banquet, etc., and takes out the food from the opening 8 on the rear surface and provides the food to the customer. In addition, since the replenishment of the taken out food can be similarly performed from the opening 7 on the opposite side, storage, provision, and replenishment of the food can be performed extremely smoothly.

At this time, since the cold air does not flow directly into the upper and lower storage chambers 31 and 32 and is indirectly cooled from the upper, lower, left and right wall surfaces as described above, it is stored in the upper and lower storage chambers 31 and 32. The dishes are stored cold without drying. Therefore, the food can be stored in a delicious state without being wrapped in a wrap or the like. On the other hand, upper and lower storage rooms 3
When the internal circulation blower 20 in 1 and 32 is operated, the cool air in the duct 51 above the top wall 25 of the duct plate 5 is sucked in and blown out toward the duct 51 on the left and right side walls 26 and 26 side. The cool air that has flowed into the ducts 51 on the left and right side walls 26 and 26 exchanges heat with the left and right side walls of the upper and lower heat conduction boxes 21 and 22, respectively, and then blows out from the front and rear discharge ports 30 as shown by arrows in FIG. . Then, the cool air in the storage chambers 31 and 32 is sucked from the suction ports 35 of the front and rear walls 27 and 28 and exchanges heat with the top walls of the upper and lower heat conduction boxes 21 and 22, and then returns to the internal circulation blower 20. As a result, a cool air circulation is formed in the upper and lower storage chambers 31 and 32 as shown by white arrows in FIGS.

Since the cool air in the upper and lower storage chambers 31, 32 is stirred by the circulation of the cool air in the upper and lower storage chambers 31, 32,
The temperature is made uniform and the upper and lower storage chambers 31, 32
Since heat exchange between the inner cold air and the top and side walls of the upper and lower heat conduction boxes 21 and 22 is promoted, the cooling efficiency in the upper and lower storage chambers 31 and 32 is improved, and the humidity is improved. Further, since the discharge port 30 and the suction port 35 are located before and after the upper and lower storage chambers 31 and 32, the cool air flow in the upper and lower storage chambers 31 and 32 occurs in the front and rear portions of the upper and lower storage chambers 31 and 32. . Therefore, heat intrusion from the front and rear doors 44 and 46 can be blocked, and the resulting upper and lower storage chambers 3 can be prevented.
In addition to improving the temperature distribution in the doors 1 and 32,
When the door 6 is opened, the cool air flow acts as an air curtain, and the invasion of the outside air can be suppressed, and the temperature rise in the upper and lower storage chambers 31 and 32 due to the intrusion of the outside air can be suppressed.
In addition, since the cold air flow does not directly hit the dishes and the like in the upper and lower storage chambers 31 and 32, their drying is suppressed.

Further, the cooling air circulation in the upper and lower storage chambers 31 and 32 causes the suction ports 3 in the front and rear walls 27 and 28 of the duct plate 5 to circulate.
Since the outside air containing moisture is sucked from the outside air outlets 53, 54, 54 through the outlet 5, the humidity in the upper and lower storage chambers 31, 32 is maintained higher by the introduction of the outside air. Here, since the outside air introduction amount decreases as the distance from the outside air introduction ports 18 and 19 increases, outside air is introduced only into the upper storage chamber 31 from the rear outside air discharge port 54, and the front and rear outside air discharge ports are introduced into the lower storage chamber 32. The introduction amount is equalized by introducing from both of the outlets 53 and 54.

Here, as the humidity in the upper and lower storage chambers 31 and 32 increases, dew condensation occurs on the lower surface of the top wall 25 and the inner surfaces of the left and right side walls 26 and 26 of the duct plate 5. However, since the top wall 25 is inclined to the left and right with the approximate center at the top, the dew condensation adhering to the lower surface of the top wall 25 smoothly flows in the left and right side walls 26, 26. Therefore, the inconvenience of condensation water dropping on dishes below the ceiling wall 25 is also eliminated.

In the embodiment, the overhanging portion 9 is formed on the top wall 6A of the heat insulating box 6, and the cooling chamber 11 in which the evaporator 33 is disposed in the overhanging portion 9 is formed. The evaporator 33 and the blower 34 can be provided without reducing the volume of the 31 and 32. Further, in the embodiment, the low-temperature storage having the upper and lower storage chambers has been described. However, the present invention is not limited thereto, and the present invention is effective even in a low-temperature storage having only one room.

[0031]

As described in detail above, according to the first aspect of the present invention, since the storage chamber is opened in the front-rear direction by opening the door, articles can be stored from one side and taken out from the other side. Therefore, provision of articles such as cooked dishes and replenishment to the storage room can be performed smoothly. In addition, since the storage room is indirectly cooled from the top, bottom, left and right sides of the heat conduction box except for the front and rear openings, foods such as dishes stored in the storage room should be stored at low temperature without drying. Will be able to

In particular, a duct plate is arranged in the storage room with a space between the top wall and the side wall of the heat conduction box, and a storage space provided between the top wall of the duct plate and the top wall of the heat conduction box. By internal circulation blower,
Cool air is discharged from outlets formed before and after the side wall of the duct plate into the storage room, and forms cool air circulation sucked from suction holes formed before and after the top wall of the duct plate. Heat exchange with the side wall surface is promoted, thereby improving the humidity inside the storage room, and generating a cool air flow at the front and back of the storage room, so that heat is prevented from entering the door and the temperature distribution is improved. it can. In addition, the cold air flow does not directly hit foods such as dishes in the storage room, so that their drying can be suppressed.

According to the second aspect of the present invention, since the storage chamber is similarly opened in the front-rear direction by opening the door, articles can be stored from one side and taken out from the other side.
Therefore, provision of articles such as cooked dishes and replenishment to the storage room can be performed smoothly. In addition, since the storage room is indirectly cooled from the top, bottom, left and right sides of the heat conduction box except for the front and rear openings, foods such as dishes stored in the storage room should be stored at low temperature without drying. Will be able to

In particular, a duct plate is disposed in the storage room with a space between the top wall and the side wall of the heat conduction box, and a ventilation fan provided between the duct plate and the heat conduction box for circulating in the refrigerator. Cool air is discharged from the discharge port formed in the duct plate into the storage room and forms a cool air circulation that is sucked from the suction port, thereby promoting heat exchange with the wall of the heat conduction box and thereby improving the humidity in the storage room. And the temperature distribution in the storage room is improved. In addition, since the top wall of the duct plate is inclined downward at both sides with the substantially central portion as the apex, dew attached to the lower surface of the top wall of the duct plate flows smoothly to both sides. Therefore, it is possible to eliminate the inconvenience of dew condensation of the food and the like stored in the storage room below the top wall of the duct plate.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a low-temperature storage according to the present invention.

FIG. 2 is a vertical side view of the low-temperature storage according to the present invention.

FIG. 3 is a perspective view of a low-temperature storage according to the present invention.

FIG. 4 is a perspective view of a duct plate of the low-temperature storage of the present invention.

FIG. 5 is a perspective view of the upper part of the heat insulating box except for the door of the low-temperature storage of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-temperature storage 5 Duct plate 6 Heat insulation box 7 Opening 8 Opening 20 Blower for circulation in a warehouse 21 Upper heat conduction box 22 Lower heat conduction box 25 Top wall 30 Discharge port 31 Upper storage room 32 Lower storage room 33 Evaporator 34 Blower for evaporator 35 Suction port 39 Cold air passage 44 Door 46 Door

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kenji Sato 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-3-105186 (JP, A) 2-55069 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25D 17/08 311 F25D 23/02

Claims (2)

(57) [Claims] 1. A heat insulating box having an opening on front and rear surfaces, and a door for closing the front and rear opening of the heat insulating box so as to be openable and closable, respectively.
A heat conduction box having openings in front and rear surfaces, disposed at intervals in the heat insulation box, and having an interior as a storage room; and cold air formed between the heat conduction box and the heat insulation box. A passage, comprising an evaporator and an evaporator blower of a cooling device disposed in the cool air passage, forcibly circulating the cool air cooled by the evaporator into the cool air passage by the evaporator blower, In a low-temperature storage for indirectly cooling the storage room, a duct plate disposed in the storage room at an interval from a top wall and a side wall of the heat conduction box, and a top wall of the duct plate and the heat source. A ventilation fan provided between the top walls of the good guide box, a discharge port formed before and after the side wall of the duct plate, and a suction port formed before and after the top wall of the duct plate; Characterized by a cold storage. 2. A heat insulating box having an opening in front and rear surfaces, and a door for closing the front and rear opening of the heat insulating box so as to be openable and closable, respectively.
A heat conduction box having openings in front and rear surfaces, disposed at intervals in the heat insulation box, and having an interior as a storage room; and cold air formed between the heat conduction box and the heat insulation box. A passage, comprising an evaporator and an evaporator blower of a cooling device disposed in the cool air passage, forcibly circulating the cool air cooled by the evaporator into the cool air passage by the evaporator blower, In a low-temperature storage for indirectly cooling the storage room, a duct plate disposed in the storage room at an interval from a top wall and a side wall of the heat conduction box, and the duct plate and the heat conduction box It is provided with an in-compartment circulation blower provided therebetween, and a discharge port and a suction port formed in the duct plate, and the top wall of the duct plate is inclined to be lower on both sides with a substantially central portion as a vertex. Low-temperature storage.