JPH0739899B2 - Method for equalizing the temperature inside the freezer container, etc. - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for equalizing the temperature inside a freezer container or a prefabricated refrigerator (hereinafter simply referred to as a freezer container or the like).

(Prior Art) For example, vegetable-based fresh foods such as vegetables, fruits and flowers,
Alternatively, when transporting animal-based fresh food such as seafood and meat, it is extremely important not to reduce the freshness of the fresh food during transportation and storage.

As shown in FIG. 6 and FIG. 7, when the refrigerator is operated and the cooler is operated in the refrigerating container 1 mounted on the vehicle, the cool air that has exchanged heat with the cooler flows through the inside of the refrigerator in the path indicated by the arrow. As the air circulates, the temperature of the air in the refrigerator drops. Then, it is cooled to a desired set temperature, for example + 3 ° C. As the temperature inside the refrigerator cools and the temperature decreases, the volume of air tends to decrease. This phenomenon resulted in the invasion of warm air from the outside. Although the four rounds of the rear door 3, which is the loading / unloading port for the cargo of the refrigeration container, are finished in a sealed structure, they become imperfect with the aging, and warm air enters from there. Due to this phenomenon, there was always a temperature difference between the front part and the rear part inside the freezing container. That is, the temperature inside the refrigerator was uneven.

(Problems to be Solved by the Invention) When a refrigerating container operates, especially when the operating rate of the refrigerator increases at high temperatures in summer, the temperature inside the refrigerator is prevented from becoming non-uniform, and the temperature inside the refrigerator is always uniform. It is intended to provide a refrigerating container in a temperature distribution state.

(Means for Solving the Problem) In a refrigeration container equipped with a refrigerator, a ventilation window for ventilation is installed on a wall surface near the cooler, and the ventilation window is opened / closed in conjunction with operation / stop of the refrigerator. Then, the outside air taken in through the ventilation window passed through the cooler and was circulated in the refrigerator.

Further, when opening and closing the ventilation window, the ventilation window is closed later than the stop of the refrigerator.

Furthermore, ventilation ventilation windows can be installed on the side wall surface near the cooler.

(Function) When the ventilation window is opened in conjunction with the operation of the refrigerator, the outside air is sucked in through the ventilation window. Although the inside of the refrigerator tends to be decompressed due to the cooling inside, the decompression is prevented by inhaling the outside air from the ventilation window, thus preventing the outside air from entering through the rear door gap and the like and preventing the temperature inside the refrigerator from becoming uneven. be able to.

(Example 1) FIG. 1 is a vertical cross-sectional view of a refrigerating container 1 mounted on a vehicle. 2 is a cooler provided on the upper part of the front wall of the freezing container 1,
Reference numeral 3 is a pair of rear doors of the gannon type. Reference numeral 5 denotes a ventilation window provided on the front wall side for opening and closing for ventilation. As this ventilation window 5, for example, the ventilation adjusting device described in Japanese Utility Model Publication No. 46-21430 can be used.

The ventilation window is opened and closed in conjunction with the operation and stop of the refrigerator or by detecting the temperature inside the refrigerator. Further, it is preferable that the ventilation window is closed with a slight time delay due to the stop of the refrigerator.

The ventilation window may be provided not only on the front wall but also on the side portion.

With this configuration, when the refrigerator is operated, the ventilation window 5 is automatically opened in association with this, and the outside air is sucked in from the ventilation window 5 to increase the pressure drop in the refrigerator due to the temperature drop. Then, the outside air that has entered from the front wall passes through the cooler and is cooled, and then is uniformly circulated in the refrigerator.

In this way, the volume decrease caused by air cooling in the refrigerator during operation of the refrigerator is supplemented with air from the outside, and the air that has been heat exchanged with the cooler is supplemented to prevent uneven temperature in the refrigerator. be able to.

(Experimental example 1) Next, the result of having measured the temperature distribution state of the refrigerating container which has the ventilation ventilation window which consists of the above structure, and the refrigeration container which does not have a ventilation ventilation window on the same conditions is shown below.

In FIG. 2, the temperature sensor 5 is installed in the vicinity of the outlet of the cooler 2, the temperature sensor 6 is installed in the vicinity of the inner floor of the double door, and the temperature sensor 7 is installed outside the refrigeration container. The refrigerating container 1 used was 40 feet in length, the thickness of the heat insulating urethane foam was 100 mm, the temperature condition was set to + 3 ° C inside the chamber, and the outside temperature was set to 30 ° C (temperature inside the constant temperature chamber). The temperature t 6 at the position of the temperature sensor ₆ and the temperature sensor 5
The temperature difference between the temperature t ₅ at positions, for t ₆ -t _5, that were measured are in Table 1.

As is clear from this table, in the case of a refrigerating container equipped with a ventilation / ventilation window, there is no change in the temperature difference t ₆ −t ₅ even when the refrigerator is operating or when the refrigerator is stopped. This means that no volume reduction of air was observed, indicating that heat was not transferred to the inside of the refrigerator.

On the other hand, in the case of a refrigeration container without a ventilation window,
When operating the refrigerator, the temperature difference t ₆ -t ₅ is 3.5 ° C when operating the refrigerator.
In comparison with the case of a refrigerating container equipped with a ventilation / ventilation window even when the refrigerator is stopped, the temperature difference is clearly higher. It is clear that this is due to
In this way, the effect of equalizing the temperature by means of the ventilation window is clearly shown.

(Experimental example 2) The size of the box is 9.4 m in length, 2.3 m in width, 2.0 m in height, the heat insulation wall is 100 mm in thickness of heat insulation urethane foam, and the refrigerator is set temperature 3 ℃, outside temperature 30 ℃ Table 2 shows the results of experiments conducted on the above.

As is clear from this experiment, when there is a ventilation ventilation window linked to the refrigerator, it is about 1.0 when the refrigerator is operating and when the refrigerator is stopped.
Although it is almost uniform at ℃ and about 0.8 ℃, the difference is large at 2.5 ℃ and 2.0 ℃ without a ventilation window.

Example 2 Next, an example of the prefabricated refrigerator shown in FIGS. 4 and 5 will be described. FIG. 4 is a vertical sectional view of the prefabricated refrigerator, and FIG. 5 is a horizontal sectional view of the same.

In the figure, 9 is a prefabricated refrigerator, and a cooler 11 is provided on the top of the prefabricated refrigerator 9 and a door 10 is provided on the side surface. Reference numeral 12 is a ventilation window provided on the upper side wall of the refrigerator 9.

(Experimental Example 3) The result of measuring the temperature distribution at two points of the prefabricated refrigerator 9, that is, the temperature sensor 13 in the vicinity of the outlet of the cooler 11 and the temperature sensor 14 located at a position away from the outlet is the third result.
Shown in the table.

As a measurement condition, the prefabricated refrigerator has an area of about 1 tsubos, the thickness is 42mm with heat insulating urethane foam, the set temperature is 3 ℃ in the refrigerator, and the outside temperature is 3
It is 0.5 ° C.

As is clear in the above table, the temperature difference t between the temperature t ₁₄ at the location of the temperature t ₁₃ and the temperature sensor 14 at the position of the temperature sensor 13 when the refrigerator is stopped at the time of the refrigerator operation when there is a ventilation window 12 ₁₄ −t ₁₃ is about 1.0 ℃ and about 0.7 ℃.

On the other hand, when the ventilation ventilation window 12 is not provided, t ₁₄ −t ₁₃ is about 3.0 ° C when the refrigerator is operating, whereas t ₁₄ −t ₁₃ is t 3.0 when the refrigerator is stopped.
The value of _14- t ₁₃ is 0.8 ℃, which is small.

Also, t ₁₄ −t ₁₃ when the refrigerator is operating and with a ventilation window is 1.0
In contrast to the temperature of ℃, without a ventilation window, the value is as large as 3.0 ℃, and it can be seen that warm air enters due to the volume decrease.

(Effect) As described above, the ventilation ventilation window is provided in the vicinity of the cooler of the refrigeration container, and the air sucked through the ventilation window is circulated through the cooler together with the cold air circulating in the refrigerator. Since it is possible to prevent the decompression of the air in the refrigerator and prevent the outside air from entering from the rear door or the floor due to the decompression, it is possible to keep the temperature inside the refrigerator uniform.

By eliminating the temperature unevenness in the refrigerator, all the frozen foods and the like in the refrigerator can always be kept under the same conditions, which is suitable for maintaining the quality.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a refrigerating container which is a first embodiment of the present invention. FIG. 2 is a vertical sectional view of the refrigerating container, and FIG. 3 is a horizontal sectional view of the same, showing a temperature sensor installation position. FIG. 4 is a longitudinal sectional view of the prefabricated refrigerator according to the second embodiment of the present invention, and FIG. 5 is a transverse sectional view of the same, showing the location of the temperature sensor. FIG. 6 is a vertical sectional view of a known refrigerating container, and FIG. 7 is a horizontal sectional view of the same. In the figure; 1 ... Refrigerating container, 2 ... Cooler 3 ... Rear door, 4 ... Floor 5 ... Ventilation window (for ventilation) 6,7,8 ... Temperature sensor 9 ... Prefabricated refrigerator, 10 …… door 11 …… cooler, 12 …… ventilation window 13,14 …… temperature sensor

Claims (3)

[Claims] 1. In a refrigerating container or the like equipped with a refrigerator, a ventilation window for ventilation is installed on a wall surface near a cooler provided inside the refrigerator, and the ventilation window is opened / closed in conjunction with operation / stop of the refrigerator. In this way, the outside air taken in through the ventilation window is circulated in the inside of the refrigerator after passing through the cooler. 2. The opening / closing of the ventilation window, wherein the ventilation window is closed with a time delay due to the stop of the refrigerator, so that the inside temperature of the refrigerating container or the like is made uniform. Method. 3. The method for equalizing the internal temperature of a refrigerating container or the like according to claim 1, wherein a ventilation window is installed on a side wall surface near the cooler.