JPS5854613Y2 - frozen showcase - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a refrigerating showcase, and is particularly intended to improve the function of preventing frost from forming on the inner wall of the ventilation passage.

Generally, this type of showcase includes an open type in which the front or top opening for loading and unloading products is covered with an air curtain, and a closed type in which the showcase can be opened and closed with a glass door or sliding door.

Among these, the open type will be briefly explained with reference to FIG. 1, which schematically shows this.

This showcase is constructed by providing inner boxes 2 at regular intervals inside an outer box 1 made of an insulator with a large opening on the front side, and using the space between the outer box 1 and the inner box 2 to move from the bottom of the case to the back. A ventilation passage 3 is formed that reaches the ceiling through the ceiling, and a plurality of motor fans 4 arranged in the ventilation passage 3 connect an air outlet 5 on the front side of the ceiling to an air suction opening 6 on the front side of the bottom.
By forming an air curtain as shown by the arrow pointing toward , and performing circulating ventilation, the inside and outside of the case are blocked off. Also, by installing a cooling evaporator 7 in the back ventilation passage to cool the ventilation air, the interior of the case is The product is kept cool.

By the way, in the case of a refrigerated showcase, the temperature inside the case is quite low, so if the moisture in the air passing through the cold air suction port 6 is supersaturated, frost will form in the ventilation passage 3 directly below the suction port 6 and in the evaporator 7. tends to occur.

In contrast, conventionally, as shown in Fig. 2, a rod-shaped electric heater 8 is installed in the ventilation passage 3 directly below the suction port 6 where frost formation is likely to occur, and electricity is periodically turned on to perform defrosting operation by circulating hot air. was.

However, such a method is not preferable because it takes a long time to defrost, requires a relatively large amount of electric power, and affects the temperature inside the refrigerator.

The present invention aims to provide a refrigeration showcase having a structure that prevents frost from forming on the inner wall of the ventilation passage, which has less influence on the internal temperature and consumes less power than conventional products.

Generally, to prevent frost formation, it is sufficient to heat the cold air to raise its temperature by several degrees, and this can be achieved by installing cord heaters with low heat output on the ventilation duct walls. In particular, the present invention is designed to increase the heat transfer area by installing corrugated plates in areas where frosting is likely to occur, and by arranging cord heaters on the back side of the corrugated plates.

Examples of the present invention will be described below.

FIG. 3 shows an embodiment of the present invention with respect to the ventilation passage near the suction port.

In this embodiment, a corrugated plate 10.10' having a length extending over the entire length of the suction port 6 is provided along the ventilation passage walls of the outer box 1 and the inner box 2 directly below the suction port 6. This corrugated plate 1
A cord heater 8' is stretched around the back side of the 0.10', that is, the side not facing the ventilation path.

The wave height and wavelength of the corrugated plates 10 and 10' are such that the drawn cold air meander smoothly and the ventilation loss is not too large. It is preferable to install the mountain so that the valley is almost opposite to the other.

With this structure, the cold air sucked in from the suction port 6 flows and meander along the surface of the corrugated plate 10, 10', and the heat transfer area for the cold air becomes large, so the cord heater is simply attached to the ventilation duct wall. It is possible to prevent frost from forming on the corrugated plate portion and the subsequent inner wall of the ventilation passage on the leeward side even if the amount of heat generated by the cord heater 8' is smaller than when the cord heater 8' is installed in .

Although the cord heater 8' is always energized, its power consumption is small due to its low calorific value, and since there is no frost on the ventilation duct walls, the defrosting operation time for the evaporator using the rod heater can be shortened, resulting in defrosting. Efficiency is improved, power consumption is lower than before, and the effect on internal temperature is also reduced.

In addition, in the case of a refrigerated showcase, the temperature of the cold air is about minus several dozen degrees, so even if the temperature of the cold air flowing along the surface of the corrugated plate 10, 10' rises several degrees, it will have almost no effect on the temperature inside the refrigerator. .

In addition, in the example, for convenience, the case where the air curtain flow is a single layer was explained, but normally the air curtain flow is formed in multiple layers, the temperature of which increases toward the outside. The invention is applied to the coldest ventilation passages.

In addition, air curtains are not limited to the front-opening type as shown in Figure 1, but also the top-opening type, and even the closed type, which covers the front opening with a cold air curtain and opens and closes with a glass door. It can be applied to any type of refrigeration showcase that forms and circulates cold air.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the principle of a front-opening type refrigerating showcase, Fig. 2 is a schematic cross-sectional view partially showing the conventional cold air suction port and the ventilation passage directly below it, and Fig. 3 is a cross-sectional view showing the principle of a refrigerator showcase of the present invention. FIG. 2 is a cross-sectional view of essential parts of an embodiment. In the figure, 1 is an outer box, 2 is an inner box, 4 is a motor fan, 5 is an air outlet, 6 is an inlet, 7 is a cooling evaporator, 8 is a rod-shaped heater, 8' is a cord heater, 10, 10' is a corrugated board.

Claims (1)

[Scope of utility model registration request] In a refrigerated showcase whose front or top opening is covered with a cold air curtain, the ventilation passage walls of the inner box and outer box, which form the ventilation passage just below the cold air intake port of the air curtain, are each covered with a wall surface. 1. A refrigeration showcase comprising: a corrugated plate extending along the wind direction while gently meandering; and a cord heater disposed on the back side of the corrugated plate.