JP3001001U - Dew condensation prevention device for refrigerated showcase - Google Patents

Abstract

(57) [Summary] [Purpose] Effectively prevent condensation on the transparent plate of a refrigerated showcase. [Structure] A horizontally long transparent narrow heating film 12a is provided on a portion of the inner surface of the outer plate 5 of the transparent plate 11 of the refrigerated showcase close to the low temperature portion of the showcase, and a wide width is provided on a portion close to the high temperature portion. The heat generating films 12b are adhered in close proximity to each other, one ends of both heat generating films 12a and 12b are connected to each other with a conductive wire 13, and both ends are connected to a power source 10 with a cord 9 in series. As a result, the transparent plate 11 in the portion to which the narrow heating film 12a is attached heats more strongly than in the portion to which the wide heating film 12b is attached, preventing dew condensation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for preventing condensation on a transparent plate of a refrigerated showcase (hereinafter referred to as a showcase).

[0002]

[Prior art]

 Among the showcases, there is an open top type showcase that discharges cool air horizontally and forms an air curtain at the top opening. FIG. 4 shows a horizontal type showcase (1) having an upper surface opening, and a cool air blown out from a cool air discharge port (2) provided at the rear upper part of the inner surface toward a front cool air intake port (not shown). Air is sucked downward toward the transparent plate (3) made of a horizontally long glass plate provided in the front upper part of the case (1), cooled by a heat exchanger (not shown), and then re-emitted from the cool air discharge port (2). It gushes and circulates.

Since the transparent plate (3) is condensed on the outer surface by the cold air hitting the inner surface to make it difficult to see the food inside, a device for preventing this is already developed.

FIG. 5 and FIG. 6 show a conventional dew condensation preventing device, in which the transparent plate (4) is adjacent to the inside and outside and is parallel to each other and is made of a glass outer plate (5) and an inner plate (6). Are formed by sandwiching the spacer (7) between them.

On the inner surface of the outer plate (5), a known heating film (8) made by depositing a conductive metal such as silver or aluminum on a transparent polyester film is attached. The electrodes on the left and right ends of the heat-generating film (8) are connected to the power source (10) by the cord (9), which prevents the outer plate (5) from being heated and condensed.

[0006]

[Problems to be solved by the device]

 However, since the above-mentioned conventional dew condensation preventing device uniformly heats the entire outer plate (5), the lower part of the showcase (1) close to the low temperature part has a lower temperature than the upper part and is apt to be condensed. In order to prevent this, it is necessary to increase the total amount of heat generation.

In this way, the temperature of the upper portion is unnecessarily raised, and the cold air that circulates is warmed, and the power consumption is wasted. If the amount of heat generation is reduced, it will be difficult to prevent condensation on the lower part.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a dew condensation prevention device for a refrigerated showcase that can effectively prevent dew condensation with a minimum amount of electric power. I am trying.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 relates to a refrigerating showcase of an open upper surface type in which an air curtain is formed in an upper surface opening portion by cool air ejected from a cool air discharge port in an upper portion of an inner side surface. At least the side plate of the case facing the cold air discharge port is made of a plurality of transparent plates inside and outside which are closely adjacent to each other, and a narrow transparent part is formed on the inner surface of the outermost transparent plate near the low temperature part in the case. The heat-generating film is characterized in that a heat-generating film having a width wider than that of the heat-generating film is adhered to a portion close to the high-temperature portion along the longitudinal direction of the transparent plate.

In this case, it is desirable to electrically connect the heat generating films to each other in series (claim 2).

[0011]

[Action]

 The electric resistance values in the length direction of the narrow and wide heating films are inversely proportional to the width, and are larger in the narrow heating film.

Since the electric energy which is changed into thermal energy by the resistor is proportional to “resistance value × current”, the amount of heat generated in both heating films of equal length has a large resistance value when the current value is constant. The narrower heat generating film is larger, and the amount of heat generated per unit area is larger. Therefore, the part near the low temperature part where the narrow heating film is attached will be heated more strongly than the part where the wide heating film is attached, and the transparent plate that is close to the low temperature part inside the case even with a small amount of power. It is possible to effectively prevent dew condensation.

[0013]

【Example】

 1 and 2 show a first embodiment of the present invention, in which the same members as those in the conventional art are designated by the same reference numerals and the description thereof is omitted, and the showcase (1) is different from the conventional one. Because of the same, illustration and description are omitted.

Similarly to the conventional case, the see-through plate (11) of this embodiment is also formed by sandwiching a spacer (7) between the outer plate (5) and the inner plate (6) made of glass and sandwiching them. The following heat generating film (12) is attached to the inner surface of (5).

The heat generating film (12) is composed of a narrow heat generating film (12a) on the lower side and a wide heat generating film (12b) on the upper side which are parallel to each other in the longitudinal direction. In addition to being connected by a wire (13), the other end is connected to a power source (10) with a cord (9).

With the configuration of this embodiment, the heat generation amount per unit area of the transparent plate in the vicinity of the low temperature part in the showcase can be made larger than that of the other parts, and the power consumption can be minimized. Condensation on the outer surface of the transparent plate can be effectively prevented, and since the upper portion does not heat up more than necessary as in the conventional case, energy loss due to heating cold air circulating in the case can be reduced.

Further, as compared with the heat generation amount in the conventional example as shown in FIG. 3A, as shown in FIG. 3B, the electric resistance value as a whole is increased and the heat generation amount can be reduced. Therefore, it becomes possible to reduce the need for electric devices such as transformers, and also to reduce the cost in terms of configuration or power consumption.

In some cases, three or more heat generating films having different widths that are parallel to each other are attached to the outer plate (5) so that the lower portion is narrower than the upper portion, and the heating films are connected in series. The ends may be connected to the power supply (10).

Further, the means for connecting one ends of the upper and lower heat generating films (12a), (12b) to each other may be an integrated electrode made of a conductive plate or the like, instead of the conductive wire (13).

Further, not only the inner surface of the transparent outer plate (5) but also the inner surface of the inner plate (6) is provided with a plurality of heat-generating films (12) having different widths, and they are all connected in series. You may implement it.

[0021]

[Effect of device]

 According to the invention of claim 1, the amount of heat generated per unit area of the portion of the transparent plate which is close to the low temperature portion in the showcase is larger than that of other portions, so that the dew condensation on the outer surface of the transparent plate can be performed with a minimum electric power. Can be effectively prevented, and since the temperature of the upper portion does not rise more than necessary as in the conventional case, the cold air circulating in the case is not heated.

According to the second aspect of the invention, it is possible to save the work of individually connecting the upper and lower heat generating films to the power source, and reduce the number of manufacturing and assembling steps of the device.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory view of the operation of the same embodiment, (a) is a comparative conventional example,
(b) shows the present embodiment.

FIG. 4 is a perspective view of an example of a conventional refrigerated showcase.

FIG. 5 is a front view of a conventional device.

6 is an enlarged cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 (1) Refrigerated showcase (2) Cold air discharge hole (3) (4) Transparent plate (5) Outer plate (6) Inner plate (7) Spacer (8) Heating film (9) Cord (10) Power supply (11) Transparent plate (12) Heating film (12a) Narrow heating film (12b) Wide heating film (13) Conductive wire

Claims (2)

[Scope of utility model registration request] 1. A side plate of a case in which at least a cold air discharge port of an open upper surface type refrigeration showcase in which an air curtain is formed at an upper surface opening by cold air spouted from a cool air discharge port at an upper portion of an inner side surface. A plurality of inner and outer transparent plates closely facing each other, and a narrow transparent heat-generating film in a portion of the inner surface of the outermost transparent plate that is close to the low temperature portion in the case, and a portion that is close to the high temperature portion. A dew condensation preventing device for a refrigerating showcase, characterized in that a heat generating film having a width wider than that of the heat generating film is adhered along the longitudinal direction of the transparent plate. 2. A side plate of a case facing at least the cold air discharge port in a refrigeration showcase of an open upper surface in which an air curtain is formed in an upper surface opening by the cool air discharged from the cool air discharge port on the upper side of the inner surface. A plurality of inner and outer transparent plates closely facing each other, and a narrow transparent heat-generating film in a portion of the inner surface of the outermost transparent plate that is close to the low temperature portion in the case, and a portion that is close to the high temperature portion. A heat-generating film having a width wider than that of the heat-generating film is adhered along the longitudinal direction of the transparent plate, and these heat-generating films are electrically connected in series to prevent dew condensation in a refrigerated showcase. apparatus.