JPH0746014B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a low-temperature warehouse in which the interior of a refrigerator is cooled by a plate cooler.

(B) Conventional technology According to Japanese Utility Model Publication No. 57-10387 (F25B39 / 02), the upper surface is bent in a concave shape so as to be inclined lower from the front portion to the rear portion, and a triangular curved surface is formed. A substantially inverted U-shaped plate cooler having a ventilation port for installation is installed in the upper part of the storage chamber to form a cool air passage between itself and the inner box. A refrigerated showcase in which a blower is arranged so that a part is located at a ventilation port is shown.

(C) Problems to be Solved by the Invention According to the above-mentioned conventional technique, since the blower is constantly operated, when the door is opened, a large amount of cold air leaks to the outside of the storage room, and the air flow to the storage room is increased. The amount of outside air intruded increases and the temperature in the storage room rises sharply, and the blower is still operating even after the door is closed.Therefore, it takes a long time for the storage room to return to the specified temperature, and the door open time is long. If so, not only is there a problem that the temperature recovery time after closing the door will be long, and the quality of the stored products will deteriorate.In addition, the blower will continue to operate even when switching from the cooling operation suspension period called a thermocycle to the cooling operation. Since it is operated, it takes a long time for the plate cooler to cool to a predetermined temperature, and the blower for eliminating the temperature unevenness in the storage chamber and making the temperature distribution in the storage chamber uniform is plate cooling. Direct by the vessel I had to lead to the problem of inhibiting the cooling effect of the system.

(D) Means for Solving the Problems In order to solve the above problems, the present invention is a frozen showcase in which a main body is composed of an inner box, an outer box, and a heat insulating material filled between the two boxes. A meandering cooling pipe on the outer surface of the inner box, an auxiliary cooler provided above the inside of the refrigerator, a blower fan that agitates the cold air that has undergone heat exchange in the cooling pipe, and the temperatures of the upper and lower portions inside the refrigerator. And a first and a second temperature sensor for detecting the temperature difference are provided, and a low temperature warehouse is provided in which the blower fan is intermittently operated by the temperature difference detected by the temperature sensor.

(E) Action Lower the meandering cooler and auxiliary cooler to a predetermined temperature,
It is possible to mainly cool stored items with cool air that is heat-exchanged by an auxiliary cooler and naturally convection, and is cooled by a meandering cooler when the temperature difference between the upper and lower parts of the refrigerator reaches a certain value. Since the generated cool air can be stirred for a short time by a blower fan to eliminate the temperature unevenness in the refrigerator, the cooling effect in the refrigerator can be improved and the drying in the refrigerator can be reduced.

(F) Example An example will be described below with reference to the drawings. In addition to providing a plate fin type auxiliary cooler (30) on the low temperature chamber (1) shown in FIG. A meandering cooling pipe (31) is arranged on the outer surface of the box (2), and the inner box constitutes a plate cooler (6), and is called a dipping case in which a small door (32) is provided on the back surface. It also applies to cold storage (1). In such an embodiment, the cool air of the auxiliary cooler (30) always spontaneously convects as shown by the arrow (a), while the cool air exchanged by the plate cooler (6) operates intermittently in the blower fan (15). At an extremely slow speed as indicated by the arrow (b), for example, at a speed of 0.1 m to 0.2 m / sec, which slightly dries the frozen dessert such as ice cream filled in the coat can (33) stored in the refrigerator (5). Forced circulation. In the case of this cold storage (1), there is a small door (32) on the back.
Since the cooling effect from the back side of the inside (5) is lower than that from the front side due to the provision of the temperature unevenness, temperature unevenness is likely to occur, but it is possible to eliminate this temperature unevenness by the blower fan (15). it can.

As shown in FIG. 3, the control device (20) is provided with first and second temperature sensors (34) (35) for detecting the temperature of the upper part and the lower part of the inside (5). When the temperature difference detected by the temperature sensors (34) (35) becomes 3 ° C. or more, the switch (21) may be closed to intermittently operate the blower fan (15).

Therefore, according to such a configuration, it is possible to mainly cool the inside (5) with cold air that is heat-exchanged by the plate cooler (6) and naturally convection, which is shorter than the cooling time by this natural convection. Since the time ventilation fan (15) can be operated to stir the cool air, the direct cooling system of the plate cooler (6) can store the stored product at a predetermined temperature to reduce the drying thereof. The temperature unevenness, which is a drawback of the direct cooling system, is eliminated by the intermittent operation of the blower fan (15), and the inside (5)
The whole area can be maintained at a substantially uniform temperature.

(G) Effect of the Invention According to the present invention, it is possible to lower the temperature of the meandering cooler and the auxiliary cooler to a predetermined temperature, and mainly cool the stored product with the cool air that is heat-exchanged by the auxiliary cooler and is naturally convected. At the same time, when the temperature difference between the upper part and the lower part in the refrigerator reaches a certain value, the air cooled by the meandering cooler can be stirred for a short time with a blower fan to eliminate uneven temperature in the refrigerator. As a result, the cooling effect inside the refrigerator can be improved, and the drying inside the refrigerator can be reduced.

[Brief description of drawings]

Each of the drawings shows an embodiment of the low temperature storage chamber according to the present invention. FIG. 1 is a vertical sectional view of the low temperature storage chamber, FIG. 2 is a temperature characteristic diagram inside the storage chamber, and FIG. (5) …… Inside the refrigerator, (6) …… Cooler, (15) …… Blower fan.

Claims (1)

[Claims] 1. A refrigeration showcase comprising a main body composed of an inner box, an outer box, and a heat insulating material filled between the two boxes.
A meandering cooling pipe on the outer surface of the inner box, an auxiliary cooler provided above the inside of the refrigerator, a blower fan that agitates the cold air that has been heat-exchanged by the cooling pipe, and detects the temperatures of the upper and lower portions of the inside of the refrigerator. A low-temperature warehouse provided with both first and second temperature sensors, and intermittently operating the blower fan according to the temperature difference detected by the temperature sensors.