JPH06137742A - Cooling and storing refrigerator - Google Patents

Abstract

PURPOSE:To prevent dew or frost blocks from being dropped from a dew receptor pan without damaging a cooling effect within a storing chamber in a cooling and storing refrigerator of a cold air natural circulation type. CONSTITUTION:A cooling device 16 is installed within a display chamber 9. An inside part of the display chamber 9 is cooled with natural circulation of cold air cooled by the cooling device 16. A dew receptor pan 19 is arranged below the cooling device 16. The cooling device 16 is comprised of a refrigerant pipe 34, and many heat exchanging fins 36 fixed to the refrigerant pipe 34. Corners of the fins 36 are formed to have a desired curved shape having a predetermined rate of curvature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling storage for cooling a storage chamber by natural circulation of cool air from a cooler provided in the storage chamber.

[0002]

2. Description of the Related Art Conventionally, this type of natural circulation type cold storage is
It is used for preserving foods such as vegetables and side dishes that do not like to be dried by forced circulation of cold air.
Like the upper evaporator (8b) shown in Japanese Patent No. 511 (F25D23 / 00), a cooler is provided above the storage chamber surrounded by a transparent glass wall, and stored by natural circulation of cold air flowing down from this cooler. The room is cooling. Since the moisture in the storage chamber adheres to and grows on the cooler as a frost, it is usually heated by a heater every predetermined time for defrosting. A dew pan is placed below the cooler to prevent frost lumps from falling below the storage compartment.

The structure around the cooler 100 of the conventional natural circulation type cold storage will be described with reference to FIGS. 11 and 12. The cooler 100 includes a meandering refrigerant pipe 101 that constitutes a refrigerating cycle, a large number of rectangular fins 102 for heat exchange inserted through the refrigerant pipe 101 and fixed in a heat conductive relationship, and a refrigerant on both sides of the cooler 100. Pipe 101
And a tube sheet 103 for fixing the same, and is hung by a fixture 105 on the lower surface of a ceiling wall 104 of a cooling storage (not shown). In addition, a dew tray 106 is suspended and fixed by a suspending tool 107 on the lower side of the cooler 100, and dew or frost lumps that fall when the cooler 100 is defrosted are received by the dew tray 106. Be discarded.

[0004]

That is, the dew tray 106
Has a slightly recessed upper surface inside, and as described above, at least in a range wider than the vertical projection range below the cooler 100 so as to be able to receive dew and frost lumps from the cooler 100. The upper surface thereof faces the lower surface of the cooler 100.

However, since the frost grows with a certain thickness around the fins 102 of the cooler 100 as shown in FIG. 13, the outer surface of the frost projects outside the fins 102.
At this time, since the fins 102 have a rectangular shape, the outer surface of the frost also has a shape substantially conforming to the shape of the fins 102, and the surface thereof is positioned outside the upper surface of the dew tray 106. When defrosting is started in that state, the dew that has melted from the surface of the frost flows down along the surface of the frost that is still frozen, and then flows outside the dew tray 106 as shown in FIGS. 14 and 15. It will fall as it is, or it will hit the edge and bounce outward.

Further, as the melting of frost progresses and the amount thereof decreases, the frost separates from the fins 102 as a lump, and a part of the frost is lifted up on the lower side as shown in FIG.
Comes to peel from. Then, the separated frost lumps drop downward as shown in FIG. 17, and fall outside the dew tray 106 as it is, or hit the edge of the debris tray and crack, and a part of the frost falls outside. Further, as dew and frost lumps spill, as shown in FIG. 18, water droplets also wrap around to the lower surface of the dew tray 106, which drips downward even after the completion of defrosting.

As described above, conventionally, since the dew tray 106 does not completely receive the dew and frost lumps that fall from the cooler 100, the dew tray 106 does not completely catch the dew and frost, and therefore the dew tray 106 is placed on the food or the like displayed in the storage room below the dew tray 106. There was a problem that it fell on the surface and was polluted and deteriorated in quality. In addition, if the dew tray 106 is enlarged in order to solve this problem, this will interfere with the natural circulation of cold air, and the cooling effect inside the storage chamber will be impaired.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and in a so-called cold air natural circulation type cold storage, the dew from the dew tray is not impaired without impairing the cooling effect in the storage chamber. The purpose is to prevent the lump of frost from falling.

[0009]

That is, in a cooling storage (showcase) 1 of the present invention, a cooler 16 is provided in a storage room (exhibition room) 9, and natural circulation of cold air cooled by the cooler 16 is performed. The inside of the storage room (exhibition room) 9 is cooled by the above, and the dew tray 19 is arranged below the cooler 16, and the cooler 16 is provided with the refrigerant pipe 34 and a large number of the refrigerant pipes 34 attached to the refrigerant pipe 34. It is characterized in that it is composed of heat exchanging fins 36, and the corners of these fins 36 have a curved shape with a predetermined curvature.

[0010]

In the cooling storage (showcase) 1 of the present invention, the frost grows on the cooler 16 with a certain thickness, but the outer surface of the frost has a curved shape whose corners follow the shape of the fins 36. Become. Therefore, even if the outermost side of the frost that has grown on the cooler 16 extends beyond the upper surface of the dew tray 19, the dew that has melted from the surface of the frost during defrosting of the cooler 16 is still frozen. The frost flows along the surface of the frost, wraps inward along its shape, and then drops onto the upper surface of the dew tray 19 below. Further, the frost lumps that have fallen due to the progress of defrost also wrap around the lower surface of the fin 36 along the curved shape of the fin 36 and then fall on the upper surface of the dew tray 19 below.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical sectional side view of a showcase 1 as an embodiment of a cooling storage of the present invention, and FIG. 2 is a perspective view of the showcase 1. In the showcase 1, a transparent front glass 7 is attached to the front surface of a main body 6 composed of a top wall 2, a bottom wall 3 and left and right side plates 4 and 4, and a sliding door type door 8 made of transparent glass is attached to the rear surface. An exhibition room 9 as a storage room is formed in the interior of each of the walls. In the exhibition room 9, there are provided brackets 12 having rear ends engaged with and held by shelf columns 11 standing on both rear sides and in the center, and shelves 13 supported by the brackets 12 are two-tiered. , The bottom plate 1 at the bottom of the exhibition room 9
4 is laid.

A so-called cross fin type cooler 16 is attached to the uppermost part in the exhibition room 9 below the ceiling wall 2, and
Each bracket 12 has a cooler 1 formed of a meandering refrigerant pipe located below the shelf 13 and forming a refrigeration cycle.
Nos. 7 and 18 are horizontally attached. Below each of the coolers 16, 17, 18 is a horizontally long container-like dew tray 1 for receiving and discharging defrosting water dripping from them.
9, 21 and 22 are arranged respectively, and the upper surface of any of the dew trays 19, 21 and 22 is inclined so as to gradually decrease toward a drain hole (not shown), but as a whole, it is cooled horizontally. It is attached to the container 16 or the bracket 12, respectively. Fluorescent lamps 24 are attached to the front side of the cooler 16 and the front portions of the lower surfaces of the shelves 13 and 13 to illuminate the inside of the exhibition room 9.

Further, each dew pan 19, 21, 22 has a top surface shape with a slight depression inside, and each cooler 16, 1
In order to be able to receive the dew and the frost lump from 7, 18, the upper surface of the cooler 16, 17, 18 is wider than the vertical projection range below each cooler 16, 17, 18 at least.
The lower surfaces of the 18 are opposed to each other. Also, each dew pan 1
Duct plates 27, 28, and
29 is placed and stored. The duct plates 27, 28, 29 are formed by bending a horizontally long steel plate so that the central portions thereof become higher as shown in FIG.
Have a mountain-shaped top surface shape that is inclined toward the front and back, and the front and rear ends are the dew tray 1
It is located inward of the front and rear edges of the upper surfaces of 9, 21, and 22. Further, as shown in FIG. 3, a defrosting heater 33, which is an electric heater, is attached to the back surface of the duct plate 27 with an aluminum tape 32.

The cooler 16 has a meandering refrigerant pipe 34 constituting a refrigerating cycle, a large number of heat exchange fins 36 made of aluminum attached to the refrigerant pipe 34 in a heat conductive relationship, and the refrigerant pipe 34. And a tube plate 37 for fixing the same to the lower surface of the ceiling wall 2 as shown in FIG. Further, the dew tray 19 is attached to the lower side of the cooler 16 so as to face it by a suspending tool 39. Further, each of the fins 3
6 has a strip shape that is long in the front-rear direction, and its four corners are cut into curved arcs with predetermined curvatures, and curved shape portions 40 are formed therein.

The cooling and defrosting operations of the showcase 1 having the above structure will be described. The showcase 1 is a showcase for prepared foods in which the interior of the exhibition room 9 is kept at a refrigerating temperature of 0 ° C. to + 10 ° C., for example, and the coolers 16, 17, 18 are provided in a machine room (not shown) below the bottom wall 3. In addition, a compressor (not shown) that constitutes a well-known refrigeration cycle is provided, and when this compressor is operated, the cool air cooled by each cooler 16, 17, 18 is a duct plate immediately below the cooler 16, 17, 18. 27, 28, and 29, respectively, and are branched in the front-back direction along the inclined shape of the upper surface of each duct plate 27, 28, 29 as indicated by the arrow in FIG. The cool air flowing forward on the upper surface of each duct plate 27, 28, 29 overflows from the front end portions of the dew pans 19, 21, 22 and falls near the center on the shelves 13, 13 or the bottom plate 14 below them. Further, the cold air flowing backward on the upper surfaces of the duct plates 27, 28, 29 overflows from the rear end portions of the dew trays 19, 21, 22 and flows toward the door 8 to descend in front of the door 8. Finally, a natural circulation that rises inside the front glass 7 is formed, whereby the interior of the exhibition room 9 is cooled substantially uniformly.

By such cooling operation, each cooler 16, 1
Since frost grows on 7 and 18, the control device (not shown) stops the compressor once or twice in 24 hours and energizes the defrost heater 33 to start defrosting the cooler 16. To do. The defrost heater 33 is energized and generates heat, thereby heating the cooler 16 from below. This defrosting operation ends when the temperature of the cooler 16 rises to a predetermined temperature, but the duct plate 27 is closer to the cooler 16 than the dew receiving plate 19, and the defrost heater 33 attached to the back surface thereof. Since the heat from the can cools the cooler 16 effectively, the defrosting of the cooler 16 can be quickly completed and the temperature rise in the exhibition room 9 can be minimized. still,
The coolers 17 and 18 of the shelves 13 and 13 melt the frost by natural defrosting without special heating.

Next, the operation of dropping the dew and frost lumps from the cooler 16 during defrosting will be described with reference to FIGS. Frost grows on the cooler 16 with a thickness, and the outermost edge thereof is located above the edge of the upper surface of the dew tray 19 as shown in FIG. , The outer surface shape of the frost is the curved shape portion 40 of the fin 36 at the corner.
The curved shape follows the shape of. And the defrost heater 3
When 3 starts to generate heat, the dew melted from the surface of the frost
The frost that is still frozen flows along the surface. At this time, since the outer surface of the frost has a curved shape as described above, the frost that flows down follows the curved shape of FIG. 6 and FIG. 7. After wrapping around inward as described above, the dew tray 19 on the lower side or the upper surface of the duct plate 27 is dropped.

Further, as the melting of frost progresses and the amount thereof decreases, the frost comes to peel off from the fins 36 as a lump, and a part of the frost rises and peels off from the fins 36 as shown in FIG. . However, even in that case, since the corners of the fins 36 are curved portions 40, frost is not lifted up so much that the frost lumps are curved portions 4 as shown in FIGS. 9 and 10.
After wrapping around the lower surface of the fin 36 along the curved shape of 0, it falls onto the dew tray 19 below or the upper surface of the duct plate 27.

As described above, according to the present invention, the lumps of dew or frost from the cooler 16 wrap around the inside of the lower surface of the cooler 16 along the curved shape portions 40 of the fins 36 and fall from there. Thus, the dew pan 19 can smoothly receive dew or a lump of frost generated by the defrosting of the cooler 16. Therefore, the dew and frost lumps concerned are exposed to the dew pan 19
It is possible to eliminate the inconvenience of falling on the lower shelf 13 or the food on the bottom plate 14 to stain them and deteriorate the quality. In particular, since it does not increase the area of the dew tray 19, it has little adverse effect on the natural circulation of cold air in the exhibition room 9.

In the embodiment, the present invention is applied to a side dish showcase, but the present invention is effective for all refrigerators that cool the storage chamber by natural circulation of cool air, or low temperature showcases.

[0021]

As described above in detail, according to the present invention, since the fin corners of the cooler have a curved shape with a predetermined curvature, dew and frost lumps falling from the cooler during defrosting are directed inward. It becomes possible to wrap around and fall smoothly to the lower dew tray, so that it is possible to prevent or suppress the fall of dew and lumps of frost to the outside of the dew tray to prevent deterioration of the stored article. In particular,
Since there is no need to enlarge the dew tray, the natural circulation of cold air is not deteriorated and the cooling effect is not impaired, and a great effect is achieved in the cold air natural circulation type cold storage.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a showcase as an embodiment of a cold store according to the present invention.

FIG. 2 is a perspective view of a showcase.

FIG. 3 is a vertical cross-sectional side view of the cooler at the top of the exhibition room of the showcase.

FIG. 4 is a perspective view of a cooler at the top of the showroom of the showcase.

FIG. 5 is a diagram illustrating a state where dew and frost lumps are falling during defrosting of the cooler.

FIG. 6 is a diagram for explaining a state of dew and frost lumps falling during defrosting of the cooler.

FIG. 7 is a view for explaining a state of dew and frost lumps falling during defrosting of the cooler.

FIG. 8 is a diagram illustrating a state of dew and frost lumps falling during defrosting of the cooler.

FIG. 9 is a diagram for explaining a state of dew and frost lumps falling during defrosting of the cooler.

FIG. 10 is a diagram for explaining a state of dew and frost lumps falling during defrosting of the cooler.

FIG. 11 is a vertical sectional side view of a conventional cooler for a cold storage.

FIG. 12 is a perspective view of a conventional cooler for a cold store.

FIG. 13 is a diagram illustrating a state of dew and frost lumps falling during defrosting of a cooler of a conventional cooling storage.

FIG. 14 is a diagram illustrating a state of dew and frost lumps falling during defrosting of the conventional cooler of the cooling storage.

FIG. 15 is a diagram illustrating a state of dew and frost lumps falling during defrosting of the conventional cooler of the cooling storage.

FIG. 16 is a diagram illustrating a state of dew and a lump of frost falling during defrosting of a cooler of a conventional cooling storage.

FIG. 17 is a diagram for explaining a state of dew and frost lumps falling during defrosting of a cooler of a conventional cooling storage.

FIG. 18 is a view for explaining a state of dew and frost lumps falling during defrosting of the conventional cooler of the cooling storage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Showcase 9 Exhibition room 16 Cooler 19 Dew tray 33 Defrost heater 34 Refrigerant pipe 36 Fin 40 Curved part

Claims (1)

[Claims] 1. A cooling storage provided with a cooler in the storage room, wherein the storage room is cooled by natural circulation of cool air cooled by the cooler, and the cooling storage is provided with a dew tray below the cooler. A refrigerating storage cabinet, characterized in that the container is composed of a refrigerant pipe and a large number of heat exchange fins attached to the refrigerant pipe, and a corner portion of the fin is curved to have a predetermined curvature.