JPH0285675A - Cold showcase - Google Patents

Abstract

PURPOSE:To enhance preserving properties by providing a sliding-type door with a double construction, with a cold air passage therein, disposing a cooler in a cooling chamber provided at a bottom part of a storage chamber, and permitting cold air to flow downward from cold air outlet holes in a porous plate after passing through a cold air chamber provided at a ceiling part. CONSTITUTION:In the condition where an inner sliding door 13 and an outer sliding door 14 are closed, cold air cooled by a cooler 13 and provided with an appropriate humidity by humidifying air fed from an outlet part 19 flows through a cold air passage 5 into a cold air chamber 18. Then, the cold air flows out through cold air outlet holes 17 in a porous plate 16 into a storage chamber 11, flows downward in the chamber 11, and flows again into a cooling chamber 20 through a cold air return hole 21. A portion of the cold air entering the passage 15 flows into a hollow shelf plate 30, and similarly flows into the storage chamber 11 through cold air outlet holes 31. By the circulation of cold air, fresh foods in the storage chamber 11 is constantly surrounded by fresh humidified cold air, so that preserving properties are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a refrigerated showcase, and particularly to a refrigerated showcase suitable for displaying and preserving fresh products such as seafood, cakes, and fruits.

"Prior Art and its Problems" A refrigerated showcase has at least the front surface of a storage chamber made of transparent glass (transparent material) so that stored items can be seen from the outside. It is widely used to display and preserve fresh products such as seafood at a sushi restaurant, fruit at a fruit shop, and cakes at a cake shop. The cold air inside the preservation chamber is simply circulated by natural convection.

On the other hand, if cold air is directly blown onto perishable products, it will cause temperature unevenness in the perishables, which will quickly reduce their freshness.

However, according to the findings of the present inventors, the freshness of perishable products can be maintained for a longer period of time if cold air can be exchanged around the perishable products at an appropriate rate to constantly surround them with fresh cold air.

This is because not only can the temperature of the cold air surrounding fresh produce be maintained constant, but also because some fruits produce ethylene, a substance that accelerates ripening and aging. is also clear.

Against this background, the present applicant has already proposed a refrigeration system that can circulate cold air at an appropriate speed (Japanese Patent Application No. 60-298515 (Japanese Unexamined Patent Publication No. 62-1589)).
Due to its structure, this refrigeration system cannot be used as a showcase.

``Object of the Invention'' Therefore, the object of the present invention is to obtain a refrigerated showcase that can provide the same shelf life as the refrigeration device proposed in the above-mentioned Japanese Patent Application No. 60-298515.

"Summary of the Invention" The present invention provides a refrigerated showcase in which the front side of the storage chamber is made of a transparent material and the rear side is provided with a sliding door, in which a cold air chamber is formed through a perforated plate in the ceiling of the storage chamber. A cooling chamber communicating with the storage chamber is provided at the bottom of the storage chamber, and a cooler is disposed within this heating and cooling chamber, and the sliding door is a double structure with an inner sliding door and an outer sliding door. A cold air passage is formed between the cooling chamber and the cold air chamber, and a cold air circulation means is provided to communicate the cold air passage with the cooling chamber and the cold air chamber, and to cause the cold air to descend from the cooling chamber, the cold air passage, and the cold air chamber to the storage chamber through the perforated plate. It is characterized by

This refrigerated showcase was filed by the applicant in the above-mentioned patent application filed in 1983.
Compared to the refrigeration system proposed in No. 298515, the sliding door has a double structure with a cold air passage between them.
and a cooler is installed in the addition/extraction chamber provided at the bottom of the storage chamber.
Through this cooling room, cold air passage, and cold air chamber in the ceiling,
The feature is that the cold air is allowed to descend through the cold air blow-off holes in the perforated plate.

In particular, if the sliding door has a double structure with a cold air passage between them, it is possible to achieve very effective circulation of cold air in a refrigerated showcase whose front surface must be made of transparent glass. At times, the cold air passing through this cold air passage acts as a kind of air curtain, suppressing temperature changes inside the storage chamber. It is desirable to install a humidifier in the cooling room to add appropriate humidity to the cool air.

When installing shelves in the storage room, at least a plurality of inner sliding doors are provided above and below, a hollow shelf is provided in between that communicates with the cold air passage, and a cold air outlet is formed in this shelf. The circulation of cold air is not obstructed by this.

Further, the shelf board can be provided with an adjusting means for adjusting the opening area of the cold air blowing hole.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. The figure is a longitudinal sectional view of the refrigerated showcase of the present invention.

The front of the storage chamber 11 is made of transparent glass 1 so that the inside can be seen.
2, and a double-structured sliding door 2 having an inner sliding door 13 and an outer sliding door 14 is provided on the rear surface. A cold air passage 15 is formed by the gap between the inner sliding door 13 and the outer sliding door 14.

A cold air chamber 18 is defined in the upper part of the storage chamber 11 by a perforated plate 16 having a large number of cold air blowing holes 17, and a cooling chamber 20 is formed in the lower part of the storage chamber 11. The cold air chamber 18 and the cooling chamber 20 are both closed and communicated through the cold air passage 15. In the cooling chamber 20,
A cold air return hole 21 communicating with the storage chamber 11 is bored on the opposite side of the cold air passage 15.

A cooler 23 is disposed within the cooling chamber 20 . This cooler 23 is a well-known type that forms a refrigeration cycle with an outdoor unit 25 and a radiator 26 arranged in a heat radiation chamber 24 at the lower part of the cooling chamber 20, and its suction side is open to the cold air return hole 21 side. , the discharge side is located on the cold air passage 15 side. Further, a blower 27 for circulating cold air and an air outlet 29 of a humidifier 28 are opened on the cold air passage 15 side of the cooler 23. It is preferable to use an ultrasonic humidifier as the humidifier 28,
Its suction side connects to a water tank or water supply.

A shelf board 30 is provided within the storage chamber 11. This shelf board 30 is hollow and communicates with the cold air passage 15, and has a large number of cold air blowing holes 31 formed at least on its lower surface. A cold air adjustment plate 32 is stacked on the shelf board 30, and by slidingly adjusting the position of this cold air adjustment plate 32, the opening area of the cold air blowing hole 31 can be adjusted. Similar means for adjusting the opening area of the cold air blowing holes 17 can be provided on the perforated plate 16 as well. Inner sliding door 13
is divided into two upper and lower stages by this shelf board 30,
Each can be opened and closed independently.

This refrigerated showcase with the above configuration is configured such that when the inner sliding door 13 and the outer sliding door 14 are closed, the cooler 23 (
When the outdoor unit 25), the blower 27, and the humidifier 28 are operated, cold air that has been cooled by the cooler 23 and given appropriate humidity by humidified air from the outlet 29 flows into the cold air chamber 18 from the cold air passage 15. . And this cold air is perforated plate 1
The cold air is blown into the storage chamber 11 from the cold air blow-off hole 17 of No. 6, and after descending inside the storage chamber 11, it enters the addition/removal chamber 20 again through the cold air return hole 21. Further, a part of the cold air that has entered the cold air passage 15 enters the hollow shelf board 30 and is similarly blown out into the storage chamber 11 through the cold air blow-off hole 31, and then flows into the addition/removal chamber 20 through the cold air return hole 21. enter. Through the above circulation, storage room 11
Perishable items inside are always surrounded by fresh, humidified, cool air, improving their shelf life. In addition, it is desirable to arrange an adsorbent in the addition/removal chamber 20 to adsorb aging ripening promoting substances such as ethylene.

According to the inventor's experiments, the descending speed of cold air that does not adversely affect fresh products is 0.1 to 0.3 m/sec.

The size and number of the cold air blowing holes 17 of the perforated plate 16 and the cold air blowing holes 31 of the shelf board 30 are determined in consideration of the capabilities of the cooler 23 and the blower 27 so that a descending speed of this level can be obtained. Of course, the rate of descent of this cold air can be set so as to obtain the optimum preservation quality depending on the type and quantity of perishable products.

When taking out or taking out perishables in the storage room 11, the outer sliding door 14 and the inner sliding door 13 are opened.
The cold air flowing from the bottom to the top in the cold air passage 15 acts as an air curtain to prevent the cold air in the storage chamber 11 from escaping. Therefore, temperature fluctuations within the storage chamber 11 during opening and closing are only slight, and excellent temperature stability can be obtained. Sliding doors also have the advantage of not requiring a lot of space at the rear.

"Effects of the Invention" As described above, the refrigerated showcase of the present invention circulates cold air inside the storage room, and the passage for this purpose has a double structure, the cold air passage between the sliding doors on the rear side, the ceiling It is formed by a cold air chamber at the bottom of the storage chamber and a heating and cooling chamber at the bottom of the storage chamber, and the cold air added and removed in the heating and cooling chamber is circulated by a circulation means, so that fresh cold air is always supplied into the storage chamber, and perishables are kept fresh and cold. can be wrapped and held within a narrow temperature range. In addition, in the case of fruits that produce harmful substances that accelerate aging and ripening, such as ethylene, the harmful substances can be immediately removed from around the fruit, which further improves storage stability. In addition, by creating a cold air passage between the double-structure sliding doors, it is possible to prevent cold air from escaping within the storage chamber when the doors are opened.

When a shelf board is provided in the storage chamber, by making the shelf board hollow and communicating with the cold air passage and opening a cold air outlet, it is possible to further ensure the circulation of cold air within the storage chamber. If the opening area of the cold air outlet can be adjusted, it is possible to easily deal with the amount, nature, etc. of stored items.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an embodiment of the refrigerated showcase of the present invention. 11... Storage room, 12... Transparent glass, 13...
Inner sliding door, 14... Outer sliding door, 15... Cold air passage, 16... Perforated plate, 17... Cold air outlet, 18.
... Cold air chamber, 20... Addition/extraction chamber, 21... Cold air return hole, 23... Cooler, 24... Heat radiation chamber, 25... Outdoor unit, 26... Heat radiator, 28...・・Humidifier, 29・・
- Humidified air outlet, 30...Shelf board, 31...Cold air outlet, 32...Cold air adjustment plate. Patent applicant: Dyne Foods Industry Co., Ltd. DML Co., Ltd. Agent: Kunio Miura

Claims (3)

[Claims] (1) In a refrigerated showcase where the front side of the storage room is made of transparent material and the rear side is equipped with a sliding door, a cold air room is formed through a perforated plate with a large number of cold air outlet holes in the ceiling of the storage room. A cooling chamber communicating with the storage chamber is provided at the bottom of the storage chamber, a cooler is disposed within this cooling chamber, and the above-mentioned sliding door is constructed as a double structure having an inner sliding door and an outer sliding door. A cold air passage is formed between the two, and this cold air passage is communicated with the cooling chamber and the cold air chamber, and the cold air is further passed from the cooling chamber, the cold air passage, and the cold air chamber to the storage chamber through the cold air blowing holes in the perforated plate. A refrigerated showcase characterized by being provided with a means for circulating cold air. (2) In claim 1, at least the inner sliding door is provided in a plurality of upper and lower stages, a hollow shelf board communicating with the cold air passage is provided between them, and a cold air blowing hole is provided in the shelf board. A refrigerated showcase. (3) The refrigerated showcase according to claim 2, wherein the shelf board is provided with an adjusting means for adjusting the opening area of the cold air blowing hole.