JPH06105149B2 - Cooling showcase - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a showcase that blows and cools cold air into a product storage chamber, and more particularly to an improvement of a see-through member that surrounds the product storage chamber.

Conventional technology In a showcase that displays products, making it easy to see the product storage space from the outside is an indispensable requirement. It is well known that the side surface is composed of a transparent body on a plate (so-called four-sided glass type showcase), and one example thereof is JP-B-62-16621. On the other hand, in order to cover the product storage space with a transparent body having a curved surface, JP-B-39-10268 and JP-B-61-14528
There are publications such as No. 3.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In Japanese Utility Model Publication No. 62-16621, a showcase having four side surfaces made up of four double glazings is presented, and by cooling the showcase, it is provided between a storage part and the outside. Since the temperature difference causes condensation to occur on the outer surface of the glass, warm air introduced from the machine room is blown onto the outer surface of the glass to prevent condensation. It should be noted that each side surface is formed by arranging two flat glasses in parallel with a space therebetween. In forming it, by arranging a spacer on the edge side of the glass and coating the frame body on the periphery,
It is easy to maintain a fixed interval, and it is not necessary to devise it separately, but when curved glass is adopted, maintaining the interval becomes very troublesome while increasing the manufacturing cost, especially the hemisphere. There is no double juxtaposition of flat glass.

On the other hand, in Japanese Utility Model Publication No. 39-10268, the side view is approximately 1/4.
A large and small upper lid made of a transparent material such as a circular plastic is rotatably attached, and the large or small upper lid is rotated to open and close the product storage unit. However, since this upper lid is composed of a single plate, its heat insulation is poorer than that of a multi-layer structure, and heat loss is large. For this reason, it cannot be used for those with severe temperature control zones such as a constant temperature oven where heat loss cannot be ignored in operation control, and no devise has been made in terms of dew prevention. When used as a product, there is a problem that the outer surface of the upper lid made of a transparent material such as plastic may be fogged or have a dew phenomenon, which impairs the transparency of the displayed product and makes it impossible to expect a sufficient exhibition effect. I was out.

On the other hand, in Japanese Utility Model Laid-Open No. 61-145283, a storage portion for products such as fresh confectionery is surrounded by a lid having a substantially cylindrical shape with an opened lower surface. Since this lid is also made of a single plate, it is not suitable for use in those with a severe temperature control band whose thermal loss cannot be ignored, and devised in terms of dew prevention. Not not.

Therefore, the present invention enhances heat insulation by stacking three-dimensional transparent resin bodies each having a curved surface at a distance from each other, and obtains a product storage portion in which fogging is less likely to occur and visibility is improved. The purpose is to provide an inexpensive showcase without damaging the.

[Structure of Invention]

Means for Solving the Problems The frozen showcase of the present invention includes an inner plate, a middle plate, and an outer plate that are three-dimensionally formed each having a lower surface opening, are formed of transparent resin, and are arranged in triples at intervals. A transparent member composed of an annular frame member arranged along the peripheral edge of the lower surface opening, a commodity storage unit kept at a humidity lower than the surroundings by the transparent member, and water vapor on the inner plate and the middle plate. A communicating portion for passage is provided, and the thickness of the middle plate is smaller than the thickness of the inner plate and the outer plate.

By constructing the outer plate, middle plate, and inner plate with transparent resin, the three-dimensional shape of the lower surface opening can be easily molded, but due to its high water permeability, it has a high water vapor partial pressure and the surrounding area.
Due to the difference in the partial pressures of water vapor, water will enter the inside of the see-through member that divides the transparent member that separates the commodity storage chamber in which the partial pressure of water vapor is reduced by cooling. If the amount m of water intruded through the inner plate into the product storage chamber is smaller than the amount M of water intruding, the transparent member will be fogged and dewed. Therefore, a hole for passing water vapor is formed in the inner plate. So that M <m. Further, the diameter and the number of the holes are set within a range that does not impair the heat insulating property of the air layer inside the see-through member.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

(G) is a display stand, and a leg member (T) that forms an unused space (S) is provided below a room for displaying products.

(1) is a closed-type display box (2), which is formed separately from the display box, stores mechanical parts, and draws cooling air, that is, cool air, for example, the display box such as the unused space (S) Blowers that are in communication with the machine box (3) disposed at a position distant from (2) and both boxes (2) and (3) so that air can flow, and that are covered with a heat insulating material to suppress the temperature rise of cold air. A separate type showcase consisting of a pipe (4), which can be used for freezing, refrigerating, ice temperature and warming by changing the temperature range to be controlled according to the type of products to be stored. In the example, a refrigerated showcase will be described as an example.

The display box (2) is mounted on the turntable (14) and the base (11) having the turntable (14) on which the sale product is placed and which is rotatably and detachably held A see-through member (hereinafter referred to as a hood) (13) that surrounds the product and defines a product storage chamber (12) above the base (11).
And is placed on a stand such as a display stand (G).

The base (11) has a substantially circular shape in plan view and has a product storage chamber (1
The ventilation chamber (15) is formed in the lower upper stage of the turntable (14) which is the bottom wall of 2), and the illumination chamber (16) is formed in the lower stage. Both chambers (15) and (16) have partition plates and heat insulation. Material (17) and translucent member having heat insulating property, for example, three-layer transparent glass (18)
It is divided by.

Then, the ventilation chamber (15) introduces the cold air carried from the machine box (3) through the blower pipe (4), and the cold air is blown from the blowout port (19) of the turntable (14) to the product storage chamber (12). Cold air supply as high pressure space to guide and product storage room (12)
A cold air return portion as a low-pressure space for collecting the internal air from the suction port (20) of the turntable (14) and leading it to the blower pipe (4) is separately formed.

Further, in the illumination room (16), an illumination lamp which is a part of the illumination device, for example, an annular fluorescent lamp (21) is arranged below the three-layer transparent glass (18). The central space of the fluorescent lamp (21) is used to arrange electric parts such as a glow lamp.

On the other hand, the hood (13) surrounding the product storage chamber (12) has a plurality of three-dimensional shapes (for example, a hemispherical surface) of the lower surface opening made of a transparent resin such as acrylic acid resin (in this example, the outer plate (30), The inner plate (31) and the middle plate (32), which are three transparent bodies, are arranged in a plurality of layers (three layers) at a distance from each other to form the main body and are located in the outermost layer. A fixing piece (30A) that is formed so as to project outward from the lower portion of the outer plate (30) is fixed to the hinge device. The spacing between the plates should be selected within the range where air convection is unlikely to occur in the air layers formed between the plates (for flat plates, refer to the description in JP-B-61-3201) and set the air layers. It is used as a heat insulating layer.
It is about 5 mm. Further, an annular frame body (33) made of resin is arranged around the lower ends of the inner plate (31) and the outer plate (30) along the periphery of the lower surface opening, and the entire lower surface of the annular frame body (33) is arranged. Packing (3) that seals between the hood (13) and the base (more specifically, the horizontal part of the partition plate) (11) in the recess formed in the periphery.
4) is attached. Further, in this example, the space formed by the inner plate (31) and the middle plate (32), the outer plate (30) and the middle plate (32)
The space formed by and communicates with the lower end thereof, and the thickness of the middle plate (32) is smaller than the thickness of the other plates. Moreover, since the inner plate (31) and the outer plate (30) are formed by the injection molding method and the middle plate (32) is formed by the blow molding method, the plate thickness of the middle plate (32) is not uniform and the zenith portion is not formed. It is thin.

(37) is a mounting portion (3) having a protrusion (36B) on which an outward flange (35) of the middle plate (32) is mounted at a proper position of the inner plate (31).
Directly above the 6), the air in the product storage room (12) and the hood (1
3) Water vapor passage holes that are all appropriately sized so that water vapor can travel to and from the air layer inside.

The following are the diameters and the number of the holes for water vapor passage (in this example, it is a refrigerating type, the air inside the product storage room is dehumidified by cooling and the holes themselves act as an aspirator, so they will be referred to as asperator holes) (37). Detailed description. The water vapor transmission rate of acrylic that constitutes the hood (13) is 31.6.
Since it has a high moisture permeability of [g-mm / m ³ · 24hr · atm], moisture migrates from the ambient air side with a high moisture vapor pressure to the storage room air side with a low moisture vapor pressure during cooling operation. Where the ambient temperature
30 ℃, the temperature in the chamber is 7 ℃, both humidity is 100%, and the outer plate (3
The amount of water that has penetrated into the hood is assumed to be completely absorbed by the desiccant (moisture absorbent) (38) such as morphicula sieves and silica gel arranged in the hood.
Calculating [= (water vapor transmission rate x surface area x partial pressure difference) / plate thickness], M = 31.6 x 0.2446 x 31.82 / 2.7 x 760 = 0.12 [g / 24hr) ...
… (31.82 [mmHg] is saturated vapor pressure of 30 ℃, 0.2
446 [m ² ] is the outer surface area of the outer plate). Since the pressure difference between the inside of the hood and the inside of the refrigerator is smaller than the pressure difference between the surroundings and the inside of the hood (see FIG. 7), this invading water remains in the hood and eventually condenses. Will cause dew condensation. Therefore, it is necessary to reliably transfer the water that enters the hood to the inside of the refrigerator (that is, set the asperator holes so that the amount of water m flowing out from the inner plate to the product storage chamber is m> M). First, outer plate (30), inner plate (31), middle plate (32)
When the ambient temperature and the interior temperature are set to the same conditions as described above, assuming that they are arranged in three layers in a plane, the surface temperature of each plate is as shown in FIG. Here, the temperature of the inner plate outer surface is 1
It is 0.64 ° C, the saturated vapor pressure at this temperature is 9.61 mmHg, and the pressure difference Δh with the air in the refrigerator is expressed by the pressure head, Δh = (9.61-7.51) × 10.33 / 760 = 2.85 × 10 ^-2 [ mAq]. Moisture transfer from inside the hood to the inside
It is the same as the pressure difference disappears, that is, Δh shifts from 2.85 × 10 ^-2 m to 0 m. Is required. Now, assuming that the area of the asperator hole is A and the outflowing air amount is G, G = ρ · A · = 1.2 × 10 ³ × 0.0142A = 17.04A [g / S] (ρ: air density) Included in the outflowing air The water content W is the absolute water content x = 7.6 × 10 ^-3
From [g / g] W = G · x = 17.04 × 7.6 × 10 ⁻³ × A = 0.1295A [g / S] ≈11189A [g / 24hr] If this value W is W> 0.12, there is no problem. . Caliber now
Assuming ² mm, A = πr ² = 1 / 4π × (0.002) ² ＝ 3.14 × 10 ^-6
[M ² ], W = 11189 × 3.14 × 10 ⁻⁶ = 0.035 [g / 24hr] That is, 4W = 4 × 0.035 = 0.14> 0.12, and when the diameter is 2 mm, four or more holes are required. . When the diameters are 3 mm and 4 mm, the water outflow W is W = 0.0788 [g / 2
4 hr] and W = 0.14 [g / 24 hr]. Therefore caliber 3mm
In this case, two or more holes are required, and when the bore diameter is 4 mm, one or more holes are required. In this embodiment, the bore diameter is 3 mm and the number of holes is 4 with a margin. It is desirable to install a filter in the hole that prevents insects, dust, etc. from entering the hood through the hole, but this filter will reduce the water permeability, so be careful when installing the filter. Is.

Next, under the same conditions as described above with a diameter of 3 mm and the number of arrangements of 4, arrange 5 g of water in a hood by moistening it with a material that easily evaporates, such as absorbent cotton, and perform normal cooling operation. An experiment of water discharge revealed that the inner plate (31) was in the range shown by the dotted line in the initial stage of cooling operation (that is, on the first day).
Haze occurred on the outer surface. Then, after 3 days, the cloudy part had developed to the area shown by the shaded area in FIG. 1, and after 3 days, the cloudy weather had completely disappeared. From this, about 0.7 [g / 24h
It is considered that there was evaporation of [r] (however, the amount of water penetrating is not included). 0.17 per hole
It becomes 5 [g / 24 hr. 1 hole], which is a little more than twice the theoretical value described above, and exceeds the theoretical water content of 0.12 [g / 24 hr], and the asperator effect by the asperator hole (37) is Sufficient to say.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The inner plate, the middle plate, and the outer plate have an interval (1 mm to 10 mm for flat plates, set to about 5 mm in this example) that does not cause convection to the air located between the plates. Since it is arranged, the air layer between the plates can be used as a heat insulating layer.
Considering that the product storage room surrounded by the see-through member is kept at a lower humidity than the surroundings due to its cooling, the inner plate is 2 m long.
A hole for water vapor passage of about m ~ 4 mm is provided so that the amount of water discharged from the hole into the product storage chamber is larger than the amount of water entering the transparent member. Through this hole, the partial pressure of water vapor is balanced with the partial pressure of water vapor in the air in the storage room to dehumidify, and it is possible to prevent dew condensation on the outer surface of the inner plate and the inner surface of the middle plate.

On the other hand, by connecting the space formed by the outer plate and the middle plate and the space formed by the inner plate and the middle plate to each other, the water vapor partial pressures of both spaces are equilibrated, so that they are formed in the inner plate. The air in both spaces is dehumidified by the water vapor vent holes, and it is possible to prevent dew condensation on the outer surface of the inner plate, both surfaces of the inner plate, and the inner surface of the outer plate, and not impair the see-through performance of the see-through member, that is, the display effect. Further, since each plate is formed of a transparent resin, if it has moisture permeability, if the thickness of the middle plate is made thinner than the thickness of the other plates,
Moisture that has entered the inside of the see-through member from the outer plate surface easily permeates through the middle plate, so it is easy to be discharged into the storage chamber through the holes for passing water vapor, and it is possible to make it difficult for it to stay inside the see-through member. It is possible to suppress dew formation. Furthermore, as the transparent body having the curved surface forming the showcase, since the multiple transparent resin bodies are used instead of using the glass having high manufacturing cost, it is very possible to maintain the interval between the multiple transparent resin bodies having the curved surface. It is simple, and moreover, the outer plate, the middle plate, and the inner plate of the multiple transparent resin bodies are made thinner than the outer plate and the inner plate, so not only the material cost can be reduced,
Since the middle plate can be obtained by the blow molding method which is easy to cost, the cost can be further reduced.

[Brief description of drawings]

Each drawing shows one embodiment of the present invention, FIG. 1 is an external perspective view of a hood showing a cloudy partial shrinkage state when the degree of water vapor passage is measured, and FIG. 2 is a partially cutaway state of a cooling showcase. FIG. 3, FIG. 3 is an enlarged cross-sectional view of the main part of the lower part of the hood, FIG. 4 is an exploded perspective view corresponding to FIG. 3, and FIG. 5 is an enlarged cross-sectional view schematically showing the discharge state of water vapor, FIG. 6 is an explanatory view of the dimensions of the hood, and FIG. 7 is an explanatory view of temperature and water vapor pressure distribution when the hood is arranged in three layers. (1) …… Cooling showcase, (2) …… Exhibition box, (1
2) …… Product storage room, (13) …… Hood (transparent member),
(30) …… Outer plate, (31) …… Inner plate, (32) …… Middle plate,
(33) …… Ring frame, (37) …… Aspirator hole (hole for water vapor passage).

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuo Noda 2-18 Keihan Hon-dori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Koji Mizuno 2--18, Keihan Hon-dori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. Incorporated (56) References Actual Development Sho 59-150359 (JP, U) Special Public Examination Sho 38-15128 (JP, B1) Actual Public Sho 9-4133 (JP, Y1)

Claims (1)

[Claims] 1. An inner plate, a middle plate, and an outer plate, each of which has a three-dimensional shape having a lower surface opening, is made of transparent resin, and is arranged in a triple manner with a space therebetween, and is arranged along the periphery of the lower surface opening. A see-through member consisting of an annular frame member that is provided, a product storage portion that is kept at a lower humidity than the surroundings by the see-through member, a communication portion for passing water vapor is provided in the inner plate and the middle plate, and A cooling showcase characterized in that the thickness of the middle plate is thinner than the thickness of the inner and outer plates.