JPS60228869A - Cooling box body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling box body that is provided with a transparent plate on one side that allows the inside of the refrigerator to be seen through from the outside. The purpose is to prevent dew condensation on both sides and to improve the cooling effect inside the refrigerator.

In general, cooling boxes such as freezer showcases that have an opening for storing and taking out products on the top surface are designed to insulate the inside and outside of the refrigerator and to maintain the transparency of the interior of the refrigerator. It was equipped with a transparent door that filled with dry air and could be opened and closed at will. This transparent door was an attempt to reduce heat transfer by conduction by taking advantage of the low thermal conductivity of dry air, which forms a static air layer. The spectral characteristics of glass have a high emissivity in the room temperature range, so most of the radiant heat from outside the refrigerator is absorbed by the glass outside the refrigerator, and is re-radiated from the glass inside the refrigerator through the dry air to the inside trap, where it passes through the refrigerator. They had become equivalent.

Therefore, when using this type of transparent door, even if heat transfer by conduction is prevented, there is no insulating effect against radiant heat transfer.

Furthermore, since the glass itself has a high emissivity, the glass inside the refrigerator is radiatively cooled by the low temperature inside the refrigerator, and the glass outside the refrigerator is also radiatively cooled through the dry air, so the temperature of both glasses decreases.
There was a drawback that condensation occurred on the back surface of the glass inside the refrigerator and on the surface of the glass outside the refrigerator.

In order to prevent this condensation, JP-A-52-61345 incorporates both an electric heater and an infrared reflective coating into the transparent door, and uses both to heat the outside glass of the refrigerator. In this configuration, the infrared reflective coating is provided on the outside surface of the inside glass, so it acts to radiate cooling inside the refrigerator and reflects the cold heat that has passed through the inside glass back to the inside of the refrigerator. The inside surface of the glass inside the refrigerator, which is exposed to the cold air inside the refrigerator, becomes low temperature due to the cooling effect of the human skin radiation of the cold heat, and is maintained below the dew point temperature of the cold air inside the refrigerator, and every time the transparent door is opened, dew condensation or Not only does this lead to frost formation, but the transparency effect of the transparent door becomes worse. However, this also led to the risk of electrical leakage and an increase in the refrigeration load.

The present invention has been made in view of the above drawbacks, and the following are the first points.
To explain the embodiment with reference to Figure 2, (1) is a heat insulating wall (1) formed with an opening (3) for storing and taking out products on the upper surface.
An inner box (2a) K that forms the inner wall of the heat insulating wall in a cooling box body such as a refrigerated showcase whose main body is constituted by 2).
The interior of the refrigerator (4) is defined by the inner box, and the load (products) in the refrigerator (4) is cooled by the cooling air that undergoes heat exchange and natural convection in the cooler (5) disposed on the outer surface of the inner box. It is something to do. (6) is a load line (loading water line) provided in the inner box (2a), and the load is stored and cooled below the line. (7) is a transparent door that can be opened and closed at the top opening, and has a main plate (8) made of transparent glass or resin, and a plate attached to the back side of the plate, that is, the inside surface of the refrigerator. a membrane (9), the plate body, and a handle α that covers the periphery of the membrane;
υ-attached protection member Q1. By providing the transparent door at the top opening (3), the transparent door (7)
) and the load line (6).
The temperature of this air layer is higher than that of the air layer below the load line (6), so it becomes stationary. The film is, for example, a vapor-deposited film using a metal having a high reflectance in the infrared region, and has a selective transmission/reflection function, transmitting visible light and reflecting infrared light.

According to this configuration, the air layer a formed between the transparent door (7) and the load line (6) when the door is closed has a higher temperature than the cooling air layer below the load line (6). .

In addition, in order to maintain a substantially stationary state, it is possible to prevent the natural convection cooling air from coming into contact with the transparent door (7), and to prevent the cooling air from coming into contact with the transparent door (7), which acts as a boundary layer to alleviate radiation cooling against force. In addition, the film (9) itself has a high reflectance in the infrared region, the temperature of the heat transfer surface is low, and the radiation cooling from the cooling air is reflected toward the interior (4) of the refrigerator.
The heat transfer from conduction to the membrane (9) is so small that it can be ignored, and the heat transfer due to radiation is largely reflected, keeping the temperature of the inside surface of the transparent door (7) above the dew point of the inside of the refrigerator (4). can be maintained. In addition, since the plate (8) itself has a high emissivity in the infrared region, it absorbs radiant heat (infrared rays) from outside the refrigerator, and the membrane (9) itself has a small emissivity, so the plate The inside surface of the plate (8) reflects the infrared rays that have passed through the refrigerator toward the outside of the refrigerator, and the temperature of the outside surface of the plate (8) surrounds the cooling box (1). air (outside air)
The temperature can be brought close to the dew point and maintained above the dew point.

As a result, dew condensation on the front and back surfaces of the transparent door (7) can be prevented, and the see-through effect in the visible light range can be improved.

Figure 3 shows the transparent door A of the present invention and the conventional transparent door B made of double-glazed glass. , is a characteristic diagram comparing the temperature C on the load line of each box body under various conditions. Note that d is the outside temperature. According to FIG. The surface temperature is higher, and the load line temperature of the box with door A is lower than that of the box with door B, and the surface temperature and load line of the box with door A is lower than that of the box with door B. It can be seen that the temperature difference is large and the insulation effect is excellent.

In addition, door A is always maintained at a temperature closer to the outside air temperature than door B, and in a sunny location, the plate (8) itself absorbs radiant heat directly from outside the refrigerator, and indirectly absorbs radiant heat due to reflection from the membrane (9). It can be seen that the temperature is higher than the outside temperature and is always maintained above the dew point temperature. Therefore, the cooling box body of the present invention (
1) can be fully used even under direct sunlight.

Moreover, since the present invention provides a protective member a around the transparent door (7), peeling of the film (9) from the plate (8) is prevented.

It is possible to reduce the impact when opening and closing the door, and to improve the airtight effect between the end surface of the top opening (3) and the transparent door (7).

As described above, the present invention consists of a transparent plate that constitutes the main body, which allows the inside of the refrigerator to be seen through from the outside, and a transparent plate glue that allows the inside of the refrigerator to be seen through from the outside. Since it is provided with a selective transmission reflection film that maintains the temperature of the surface higher than the temperature of the outside air, the film minimizes the heat transfer from the cooling air by conduction and radiation, so that the inside surface of the transparent plate is The temperature can be maintained above the dew point.

In addition, by transmitting the infrared rays of direct sunlight through the transparent plate by the infrared absorption effect of the transparent plate itself and the reflection effect of the film, the surface 1fr on the outside of the transparent plate is higher than the outside air temperature, which is a temperature higher than the dew point temperature. As a result, dew condensation on both the front and back surfaces of the transparent plate can be eliminated, improving the see-through effect, and improving the cooling effect inside the refrigerator by avoiding radiation cooling to the transparent plate. I can do it.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of the cooling box of the present invention, FIG. 2 is a perspective view of the same transparent door, and FIG. 3 is a temperature characteristic diagram of the box of the present invention and a conventional box. (8)... Plate, (9)... Membrane Figure 1 Figure 2

Claims (1)

[Claims] Selective transmission and reflection is applied to the inside surface of the transparent plate exposed to the cold air, which allows the inside of the refrigerator to be seen from the outside, to maintain the temperature of the outside surface of the refrigerator, which is exposed to the outside air, higher than the temperature of the outside air in direct sunlight. A cooling box body with a membrane.