JPH05322426A - Moisture condensation preventive device for show case - Google Patents

Abstract

PURPOSE:To prevent a moisture condensation on a glass surface from taking place assuredly by the reaction of negative electrons by a method wherein a plurality of shelves made of a conductive body are provided in a show case which is electrically insulated, and negative electrons are applied on respective shelves by a negative electron generator, for the constitution. CONSTITUTION:A show case 6 is installed under a condition in which the show case 6 is electrically completely insulated from the ground and a refrigerator 2 by an electrically insulating material 3, and a plurality of shelves 4 made of a conductive body are provided in the insulated show case 5. Then, under the show case 6, a negative electron generator 1 for which a high tension static electricity transformer is stored together with the refrigerator 2. For the negative electron generator 1, an AC voltage of 100V is applied to the primary side, and at the same time, at the high tension secondary side, one electrode is insulated, and the other electrode is connected with the shelves 4. By this method, negative electrons become applicable to the shelves 4 by static induction and by the reaction of the negative electrons, even when the temperature in the show case is set at 5 deg.C--5 deg.C, the moisture condensation on the glass surface is prevented from taking place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dew condensation preventing device for preventing dew on the glass surface of a showcase.

[0002]

2. Description of the Related Art Face-to-face showcases are often used to refrigerate and display Western confectioneries, and reach-in showcases are often used to refrigerate and display products such as frozen foods.
In these showcases, the temperature inside the showcases is preferably 5 ° C to -5 ° C in order to maintain the freshness of the products for a long time. However, when the temperature inside the showcase is set within this temperature range, there is a drawback that the glass surface of the showcase is fogged, that is, dew is attached and the inside of the showcase cannot be seen.

In a face-to-face showcase, in order to avoid the problem of fogging, the temperature inside the showcase is generally operated at 5 ° C. or higher. In the reach-in showcase, a transparent special heater film is applied to the inner surface of the glass door, and a code heater is installed around the door frame, and these dew condensation prevention heaters are electrically heated to dew the showcase glass door to the dew point. It is common practice to keep the temperature above the temperature.

[0004]

In the face-to-face showcase, the temperature inside the showcase is relatively high, so that the freshness of the product cannot be maintained for a long time. The reach-in showcase has a problem that the power consumed by the dew condensation prevention heater is as large as the power consumed by the refrigerator and is not economical. Therefore, an object of the present invention is to make it possible to set the temperature in the showcase to 5 ° C to -5 ° C in order to maintain the freshness of the product for a long time, and to reduce the power consumed to prevent dew condensation. The present invention is to provide a dew condensation preventing device for a showcase that enables economical operation of the showcase.

[0005]

A dew condensation preventing apparatus according to the present invention for achieving the above object comprises an electrically insulated showcase, and a plurality of shelves made of an electric conductor installed in the showcase. And a negative electron generator for applying negative electrons to the plurality of shelves.

[0006]

When negative electrons are applied to a plurality of shelves made of a conductor, even if the temperature inside the showcase is set to 5 ° C to -5 ° C, the action of the negative electrons prevents dew condensation on the glass surface.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dew condensation preventing device according to the present invention will be described with reference to the accompanying drawings. 1 and 2 show the anti-condensation device of the present invention applied to a face-to-face showcase, and FIGS. 3 and 4 to a reach-in showcase. The showcase 6 is electrically completely insulated from the ground and the refrigerator 2 by the electric insulating material 3. In the insulated showcase 5, a plurality of shelves 4 made of a conductor are installed. In the face-to-face showcase, as shown in FIGS. 1 and 2, the refrigerator 2 and the anion generator 1 are provided in the lower portion of the showcase 6, and in the reach-in showcase, the refrigerator is shown in FIGS. 3 and 4. Thus, the refrigerator 2 and the anion generator 1 are installed on the upper part of the showcase 6. Cold air is flowing from the refrigerator 2 into the insulated showcase 5.

The anion generator 1 uses a high-voltage electrostatic transformer. An AC voltage of 100 V is applied to the primary side, one pole is insulated on the high-voltage secondary side, and the other one pole is used. Only is connected to the shelf 4 made of a conductor. This allows
Negative electrons due to electrostatic induction are applied to the shelf plate 4.

The current value on the primary side of the high-voltage electrostatic transformer is electrode 1
The optimum value is 0.02A to 0.3A per m ² , and the secondary side voltage requires a design value of 5,000V to 20,000V.

Tables 1 to 4 below show the results of performance comparison between a showcase to which the dew condensation preventing device according to the present invention is applied and a conventional showcase.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

[Table 3]

[0014]

[Table 4]

[0015]

According to the present invention, the dew condensation on the glass surface of the face-to-face showcase and the reach-in showcase is prevented. Therefore, even in the face-to-face showcase,
A temperature range of -5 ° C in the case can be obtained, which enables long-term storage and freshness of products such as cakes. Further, in the reach-in showcase, the dew condensation prevention heater becomes insoluble, the running cost becomes very low, and economical operation becomes possible.

[Brief description of drawings]

FIG. 1 is a side sectional view of a facing showcase to which a dew condensation preventing device according to the present invention is applied.

FIG. 2 is a front sectional view of a facing showcase to which the dew condensation preventing device according to the present invention is applied.

FIG. 3 is a side sectional view of a reach-in showcase to which the dew condensation preventing device according to the present invention is applied.

FIG. 4 is a front sectional view of a reach-in showcase to which the dew condensation preventing device according to the present invention is applied.

[Explanation of symbols]

 1 Anion generator 2 Refrigerator 3 Electric insulating material 4 Shelf 5 Inside showcase 6 Showcase

Claims (1)

[Claims] 1. A show having an electrically insulated showcase, a plurality of shelves made of a conductor installed in the showcase, and an anion generator for applying anion electrons to the plurality of shelves. Dew condensation prevention device for the case.