JP2567694B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cooling storage that indirectly cools a storage chamber defined inside a heat-insulating box and keeps the storage chamber at high humidity. is there.

(B) Conventional technology As a conventional technology, Japanese Utility Model Application Laid-Open No. 60-93882 discloses that a heat-insulating outer box and a thermally conductive inner box are fixedly provided with a certain space.
The inner box is cooled by circulating cold air in the space between the outer box and the inner box, and the inside of the inner box is used as a refrigerating room, and the evaporator of the refrigerator and the fan for circulating the cool air are cooled to the outside. It discloses a structure of a refrigerator characterized in that it is placed in a cold air circulation space between a box and an inner box, and a set other than an evaporator of a refrigerator is equipped outside the outer box.

Further, in JP-A-61-6570, a plurality of compartments which are not connected to each other by an inner box are provided in a storage chamber of a heat-insulating box body constituted by an outer box inner box and a heat insulating material filled between both boxes. A storage is disclosed in which cold air that has been formed and has undergone heat exchange in a cooler is circulated to a cold air passage by a blower and is indirectly cooled sequentially from the uppermost compartment.

(C) Problem to be Solved by the Invention Such a conventional refrigerator and storage are intended to cool the inner heat conduction box and the inner box, and indirectly cool the refrigerating compartment and the compartment. The internal humidity in such an indirect cooling system is determined by the difference between the internal air and the wall surface temperature (dew point). That is, the total of the internal load and the heat entering from the door surface is Q, the heat transfer coefficient of the internal wall surface is α, the cooling area of the five internal surfaces is A, the wall surface temperature is t _W , and the internal temperature is t _R. Then, the following equation holds: Q = α ・ A ・ (t _R −t _W ) …… (1) t _R −t _W ＝ Q / α ・ A …… (2) Here, in order to increase the humidity in the refrigerator, , (2) In equation (2), Q is reduced. (B) Increase α.
(C) Increase A. There are three methods. But,
(B) is decided because it is natural convection. Although (a) and (c) can be covered in terms of design, their numerical value has a limit, and therefore, high humidity also has a limit.

According to the present invention, when the temperature of the outside air (hereinafter, simply referred to as outside air) is higher than the temperature inside the refrigerator, the value of Q in the equation (2) increases, so that t _R −t _W increases and the humidity decreases. Also, paying attention to the fact that the absolute humidity contained in the outside air is much higher than the absolute humidity inside the refrigerator when the outside air temperature is high, keeping the inside of the refrigerator at a high humidity with an extremely simple structure and keeping the food high. It is intended to provide a cold storage that is kept fresh.

(D) Means for Solving the Problem In order to solve the above problems, the present invention provides a heat insulating box body having a vertical partitioning column and a horizontal partitioning column in which an opening / closing door is closely attached to a front opening. The upper and lower heat conducting boxes are arranged at a distance from the heat insulating box, and the insides of the upper and lower heat conducting boxes serve as an upper storage chamber and a lower storage chamber, respectively, and the heat insulating box and the heat conducting box are provided. In a cooling storage cabinet in which a cooling means for indirectly cooling the upper and lower storage chambers is disposed in the space of and, an external air introduction duct is formed in the vertical partitioning column, and the duct faces the upper portion of the upper storage chamber. Forming an upstream inlet at a position and a downstream inlet at a position facing the upper part of the lower storage chamber, and connecting the upper storage chamber and the lower storage chamber to each other; It is a cooling storage that is provided with an extending exhaust / drain pipe.

(E) Operation According to the present invention, the outside air inlet is formed in the upper part of the heat insulating box, that is, in the top wall of the heat insulating box, and the exhaust and drain pipe is provided from the lower part of the heat insulating box, that is, the bottom plate of the storage chamber to the outside of the box. By extending and forming the exhaust part of the indoor air, due to the difference in the specific gravity of the air, the outside air is sucked in from the outside air introduction port, and the indoor air is discharged from the exhaust part. Occurs. Further, convection is promoted by the introduction of outside air and the outflow of indoor air, and α in the above formula (2), that is, the heat transfer coefficient of the heat conduction box is increased, and as a result, the humidity of the storage chamber can be made high. .

When the upper and lower storage chambers are defined, the outside air sucked from the outside air introduction port enters the outside air introduction duct formed in the vertical partitioning column, and the upper and lower storage ports are respectively stored from the upstream inlet and the downstream inlet of the duct. When entering the chamber, the air in the upper storage chamber enters the lower storage chamber through the upper drain pipe, and the air in the lower storage chamber is exhausted outside the box through the exhaust / drain pipe. This allows the upper and lower storage chambers to have high humidity for the same reason as described above.

(F) Example An example of the cooling storage of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 is a heat-insulating box body having four opening / closing doors 2 in the front opening, and the heat-insulating box body 1 is configured by filling a heat insulating material between both inner and outer boxes, and a central portion of the front opening is A vertical middle partition column 4 and a horizontal middle partition column 5 to which the packing 3 mounted on the inner peripheral surface of the door 2 adheres are fixedly equipped. Inside the heat insulating box 1, an upper heat conducting box 6 and a lower heat conducting box 7 made of, for example, stainless steel, which are open on the front surface, are fixed to all the inner wall surfaces of the heat insulating box 1 at intervals. The space formed by this is used as the cold air passage 8,
The inside defined by the upper heat conducting box 6 and the lower heat conducting box 7 is referred to as an upper storage chamber 9 and a lower storage chamber 10, respectively.

In the upper part of the upper storage chamber 9, a top plate of the upper heat conducting box 6 which is slanted rearward and an upper dew receiving plate 11 which is slanted rearward with a small clearance are detachably arranged. Similarly, in the upper part of the lower storage chamber 10, a lower dew receiving plate 12 which is slanted backward at a small distance from the top plate of the lower heat conducting box 7 is detachably arranged. . The dew receiving plates 11 and 12 are made of sheet metal covered with a cloth such as cotton. In addition, vertical vertical partition 4
An outside air introduction duct 13 is formed on the indoor side of the outside air introduction port 13 formed on the top wall of the heat insulating box 1.
14 communicates with the upper end, and the lower end reaches the upper facing position of the lower storage chamber 10. Then, the duct 13 has an upstream inlet 15 at a position facing between the top plate of the upper storage chamber 9 and the upper dew receiving plate 11. And the downstream inlet 16 is formed at a position facing between the top plate of the lower storage chamber 10 and the lower dew receiving plate 12.

On the other hand, the upper storage chamber 9 and the lower storage chamber 10 are inserted through the upper drain pipe 17 which extends from the bottom plate of the upper heat conducting box 6 through the top plate of the lower heat conducting box 7 and faces the lower dew receiving plate 12. The lower storage chamber 10 and the outside communicate with each other, and the lower storage chamber 10 and the outside are connected to the bottom plate of the lower heat-conducting box 7 through the bottom wall of the heat insulating box 1 and hang down outside the box.
Through the.

Here, the outside air inlet 14 and the exhaust / drain pipe 18
The opening area of is determined by the indoor relative humidity, the indoor temperature distribution, the operating rate of the refrigeration system, and the like.In the embodiment, the outside air temperature is 30 ° C., the outside air relative humidity is 35%, and the internal volume is about 900 liters. As for the indoor relative humidity of 70% before, 90% or more of humidity could be obtained with the outside air introduction port 14 of about 4 cm ² and the exhaust port of about 2 cm ² . By the way, the amount of outside air introduced at this time is 1 m measured.
The wind speed is about / s and the amount of outside air introduced is 0.72 m ³ / h.

In the cold air passage 8 between the top wall of the heat-insulating box 1 and the top plate of the upper heat conducting box 6 facing the top wall, a blow-out port 19 is provided at the front part and a suction port 20 is provided at the rear part as cooling means. A unit cover 21 having the above is disposed, and inside the unit cover 21, a refrigerating evaporator 22 and a cooler air blower 23 facing the outlet 19 are housed in front of the evaporator 22. The evaporator 22 is an electric compressor 24 and a condenser 25 mounted on the top wall of the box 1.
The refrigeration cycle is configured by connecting with. 26 is a condenser air cooling fan.

In the cold air passage 8 between the rear wall of the heat-insulating box 1 and the rear plates of the upper and lower heat-conducting boxes 6 and 7 facing the rear wall, a vertical partition plate 27 is provided in the vertical direction to form a discharge passage 8A. A return passage 8B is formed, and both passages are linked by the lower communication port 28. Further, in the cold air passage 8 between the bottom plate of the upper heat conducting box 6 and the top plate of the lower heat conducting box 7, a horizontal horizontal partition plate 30 having a communication port 29 formed at the front is arranged. .

In the above-mentioned configuration, the cool air that has undergone heat exchange in the evaporator 22 is discharged from the outlet 19 to the cool air passage 8 by the blower 23 and circulated in the path shown by the arrow in FIG. After cooling, the lower heat conducting box 7 is cooled through the communication port 29, and then the lower communication port 28 is passed through the return passage 8B to the suction port.
From 20, it is returned to the evaporator 22 again. As a result, the air in the upper storage chamber 32 and the lower storage chamber 33 is indirectly cooled via the upper and lower heat conducting boxes 6 and 7. Such a storage room 9,10
The indirect cooling method of (1) exerts a great effect as one requirement for maintaining the storage chambers 9, 10 at high humidity.

Further, due to the difference in the specific gravity of the air, the outside air sucked from the outside air introduction port 14 enters the outside air introduction duct 13 formed in the vertical partitioning column 4, and is vertically moved from the upstream inlet 15 and the downstream inlet 16 of the introduction duct 13, respectively. Enter the storage chambers 9 and 10 of the above, pass over the upper dew receiving plate 11 and the lower dew receiving plate 12, and the upper and lower heat conducting boxes 6, 7
It is cooled by exchanging heat with the top plate of the above, and flows downward in the room through the gaps on both sides and the rear of these dew receiving plates 11 and 12. This time,
The cooled and supersaturated water condenses on the top plate and adheres to the top plate or drops to wet the dew receiving plates 11 and 12.

In this way, by getting the dew receiving plates 11 and 12 wet, a transpiration action accompanied by latent heat occurs between the room and the dew receiving plates 11 and 12.
As a result, heat transfer is promoted between the top plate and the dew receiving plates 11 and 12, and the cooling surface of the top plate can be effectively used, resulting in the temperature difference (t _R −t _W ) Becomes smaller, and the humidity in the upper and lower storage chambers 9 and 10 can be increased.

On the other hand, since the indoor air has a lower temperature and a larger specific weight than the outside air, the air in the upper storage chamber 9 is
Then, the air in the lower storage chamber 10 is discharged through the exhaust / drain pipe 18 to the outside of the box body.

In this way, by introducing the outside air whose absolute humidity is higher than that of the room air, the humidifying effect is generated, and the convection is promoted by the outflow of the room air. Α, that is, the heat transfer coefficient of the heat-conducting boxes is large, and the temperature difference between the upper and lower heat-conducting boxes 6 and 7 and the room air is small.As a result, the humidity of the upper and lower storage chambers 9 and 10 is increased. Can be humidity.

The above description is an example in which the storage chamber is formed vertically. When the storage chamber is one chamber, the same operation as that of the embodiment is achieved only by the configurations of the outside air inlet 14 and the exhaust / drain pipe 18 of the above embodiment. The effect can be exerted. Further, the outside air inlet formed in the upper part of the heat insulating box and the exhaust part formed in the lower part of the heat insulating box are not limited to the configuration of the embodiment, and may be changed without departing from the spirit of the present invention. can do.

(G) Effect of the Invention The present invention has the effects listed below.

By introducing external air into the storage room, convection is promoted in the storage room, and the heat transfer coefficient of the heat conducting box increases.
The temperature difference between the heat conduction box and the room air is reduced, and as a result, the humidity in the storage room can be increased, and the freshness of the stored food can be maintained well.

By introducing external air having a higher absolute humidity than indoors, a humidifying effect due to the absolute humidity occurs, the storage chamber can be made high in humidity, and the freshness of stored food can be favorably maintained.

In the cooling storage, the outside air introduced from the outside air introduction port is effectively used in the partition column, and the outside air introduction passage is passed between the heat conduction box and the dew receiving plate to form the drain drain pipe. Since it also has a function of discharging the outside air passing through the inside of the refrigerator, the structure can be simplified and the humidifying effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a cooling storage of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. 1 ... Insulation box, 4 ... Vertical partitioning column, 6 ... Upper heat conducting box, 7 ... Lower heat conducting box, 9 ... Upper storage room, 10 ... Lower storage room, 13 ... Outside air inlet duct, 14 ... Outside air inlet port, 15
…… Upstream inlet, 16 …… Downstream inlet, 17 …… Upper drain pipe, 18 …… Exhaust and drain pipe (exhaust section).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Showa 52-69667 (JP, U) Showa Hira 1-31974 (JP, U) Showa 62-29082 (JP, U) Japanese Patent Sho 46- 17737 (JP, B1)

Claims (1)

(57) [Claims] 1. A heat-conducting box is disposed inside a heat-insulating box having a vertical partitioning column and a horizontal partitioning column whose opening and closing doors are in close contact with the front opening, at a distance from the heat-insulating box. In the cooling storage cabinet, wherein the inside of the heat conducting box is a storage chamber, and a cooling means for indirectly cooling the storage chamber is provided in the space between the heat insulating box and the heat conducting box, the vertical partitioning column. An external air introducing duct is formed in the duct, and an external air introducing port is formed in the duct at a position facing the upper portion of the storage chamber, and the dew receiving portion is provided between the upper portion of the storage chamber and the heat conducting box. By providing a plate, an external air introduction path is formed between the heat conducting box and the dew receiving plate, and an exhaust / drain pipe extending outside the box is provided in the lower part of the storage chamber. Cooling storage characterized by.