JPS636374A - Low-temperature storehouse - 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 (a) Industrial Application Field The present invention relates to a low-temperature refrigerator that cools the interior of the refrigerator using a plate-shaped cooler.

(b) Conventional Technical Utility Model Publication No. Sho 57-10387 (F25B39102)
The upper surface is bent concavely from the front to the rear to form a triangular bent surface, and the upper surface is formed with a ventilation hole for the blower, making it an approximately inverted U-shaped cooling plate. A refrigerated showcase is constructed by arranging the container at the top of the storage chamber to form a cold air passage between it and the inner box, and arranging a blower so that the motor part is located between the folded surfaces and the propeller part is located at the ventilation opening. It is shown.

el Problems to be Solved by the Invention According to the above-mentioned conventional technology, since the blower is constantly operated, a large amount of cold air from the storage room leaks to the outside when the body is opened.
The amount of outside air entering the storage room increases and the temperature in the storage room increases sharply.Also, since the blower is still operating even after the door is closed, it takes a long time for the storage room to return to the specified temperature, and it is difficult to open the door. If the time is longer, the time for temperature recovery after closing B will be longer, which not only causes problems such as deterioration of the quality of stored products, but also when switching from a cooling operation suspension period called a thermocycle to cooling operation. However, because the blower continues to operate, it takes a long time for the plate cooler to drop to the specified temperature. This led to the problem that the cooling effect of the direct cooling method using the plate cooler was inhibited.

B) Means for Solving the Problems In order to solve the above problems, the present invention includes a plate-shaped cooling section (6) that cools the inside of the refrigerator (5), and agitates the cold air heat-exchanged with this cooler. The blower fan a9 is operated intermittently, and the operating time (T
To provide a low-temperature refrigerator (1) equipped with a control device that makes a stop time (T2) longer than that of 1).

(e) The intermittent control of the blower fan α9 by the control device (■) of the operational embodiment is carried out regardless of the opening/closing operation of the temperature regulator αη, and is performed during the period when the switch 1211 is open, that is, the stop time of the blower fan α9 (T, ), the interior of the refrigerator (5) is cooled by natural convection of cold air heat exchanged in the plate cooler (6),
Also, while the switch (211) is closed, that is, the blower fan α
During the operating time (T,) of 9, the cold air heat-exchanged by the plate cooler (6) is forced to circulate by the blower fan α9 as shown by the arrow in Fig. 4, so that the inside of the refrigerator +51 is cooled. As shown in Fig. 2, this intermittent operation is repeated, and as a result of this intermittent operation, the temperature difference between the temperature (t,) at the upper part of the refrigerator (51) and the temperature (t, ) at the lower part is small or the same. This will improve temperature unevenness.

(f) Example The following example will be explained with reference to the drawings as shown in Figure 3 (1).
is a low-temperature refrigerator such as a refrigerated showcase whose main body is composed of an inner box (2), an outer box (3), and a heat insulating material (4) filled between the two boxes, which is defined by the inner box. The inside of the refrigerator (51) is equipped with a direct cooling type plate cooler (6) formed by the roll pound method and bent into an approximately inverted U shape, and a shelf (7),
Furthermore, a slidable transparent door (8) is provided at the front of the storage room. (9) is a machine room in which a compressor αα, a condenser αυ, etc., which together with the cooler constitute a refrigeration cycle, are installed. The cooler has an upper surface (6a) and both side surfaces (6b), and the upper surface (6a) is bent into a concave shape so as to be sloped lower from the front to the rear, and the upper surface (6a) has approximately triangular folds on both sides. A curved surface (6c) is formed, and a ventilation hole CL3 is formed at the center of the upper surface. This cooler is located on the top (6a
) and a cold air passage U between both sides (6b) and the inner box (2).
is arranged on the upper part of the storage P3+51 so that it is formed. α
It is a serving plate.

Therefore, (is is motor part Cl 5A) is bent surface (6
During c), the propeller part (15B) is located at the ventilation port (1z), and the operation of the fan blows the cold air inside the refrigerator (5) to the cooler (6) as shown in Figure 4. )
It flows along the inner surface, reaches the cold air passage 131 through the ventilation opening t12, becomes a circulating flow flowing along the outer surface of the cooler (6), and heat is exchanged on the circular outer surface of the cooler (6).

FIG. 1 shows an electric circuit, in which El is an AC power source, αe is an operating circuit for the compressor α, and a drive means for the electric motor (CM) is provided between the two.

A starting relay (RY) and a starting capacitor (q) are provided in parallel, and the compressor (10) is operated or stopped by the temperature regulator aD, which opens and closes by detecting the temperature of the cooler (6). U is an operating circuit for the blower fan α9, which is in a parallel relationship with the operating circuit α6), and the transparent door (5) is operated in parallel with the operating circuit α6).
The door switch JTE4, which opens when the switch 8) is opened, the switch 211 of the control device (described later), and the motor section 15
This is a series circuit consisting of A).

■ is a control device that intermittently controls the operation of the blower fan α9, and is connected to a timer motor (T
M) and a switch (21J) that is open for a period of time as the timer motor rotates.The timer motor (TM) is, for example, a cycle timer motor with a period of 10 minutes, and is open for 7 minutes. A mechanism is provided to keep the switch CI!11 in the OFF state, ie, the switch CI!11 is in the open state, and the switch CI!11 is kept in the ON state, ie, the switch CI!11 is in the closed state, for 3 minutes, and this mechanism is repeatedly performed.

The intermittent control of the blower fan α9 by the control device is performed regardless of the opening/closing operation of the temperature regulator (171),
While the switch is open, that is, during the stop time (T) of the air blower, the inside of the refrigerator (5) is cooled by the natural convection of the cold air that has undergone heat exchange in the plate cooler (6). In addition, while the switch (2υ) is closed, that is, during the operation time (T1) of the blower fan α9, the cold air that has been heat exchanged with the plate cooler (6) is forced to circulate as shown by the arrow in Figure 4 using the blower fan. As a result, the inside of the refrigerator (5) is cooled, and this intermittent operation is repeated as shown in Fig. 2. The temperature difference with the temperature (t2) at 9 will be smaller, and the temperature unevenness will be improved.In addition, when the transparent door (8) is opened while the blower fan α is operating, the door switch α9 will be opened, and the Fan αS will be stopped.

In addition, the present invention is applicable to the low temperature thickness fl shown in FIG. 5 as another embodiment.
+, that is, a plate fin-shaped auxiliary cooler (7) is provided in the upper part of the inside of the refrigerator (5), and a meandering cooling pipe C311 is arranged on the outer surface of the inner box (2) to make this inner box into a plate-like shape. Cooler (6
) and is also applied to a low-temperature refrigerator (1) called a dipping case with a small nc3'a on the back. In this embodiment, the cold air in the auxiliary cooler (2) always undergoes natural convection as shown by the arrow (A), and the cool air heat-exchanged in the plate-shaped cooler (6) during the intermittent operation of the air blower 7 an α9. Extremely slow speed as shown by the arrow (B), for example, O, 1 m to 0.2 @/sec, to slightly dry frozen desserts such as ice cream filled with light in coated cans stored in the chamber (5). forced circulation to a certain degree. In the case of this low temperature refrigerator + IJ, there is a small door c3 on the back.
2, the cooling effect from the back of the refrigerator interior (5) is weaker than that from the front, so temperature unevenness tends to occur. It is possible to resolve the issue.

In addition, as shown in Fig. 6, the control device (■) is installed inside the refrigerator (5).
Both the first and second temperature sensors (B) (to) are provided to detect the temperature at the upper and lower parts of the
When the temperature difference detected by the switch (to) exceeds 3℃, the switch (
211 may be closed and the blower fan α9 may be operated intermittently.

Therefore, according to this configuration, in addition to being able to mainly cool the refrigerator interior (5) with cold air that undergoes heat exchange and natural convection in the plate cooler (6), the cooling time is shorter than that of the natural convection. Since the blower fan 051 can be operated for hours to agitate the cold air, stored items can be stored at a predetermined temperature using the plate cooler + 610 liter cooling method, and drying can be reduced. The temperature unevenness, which is a drawback, is solved by the intermittent operation of the ventilation fan (151), and the inside of the refrigerator (5
) The entire area can be maintained at a substantially uniform temperature.

(G) Effects of the Invention According to the present invention, it is possible to lower the temperature of a plate-shaped cooler to a predetermined temperature, and mainly cool stored items with the cold air that undergoes heat exchange and natural convection in the plate-shaped cooler, and Natural convection of cold air is stirred for a short period of time by a blower fan to even out the temperature inside the refrigerator, so the cooling effect inside the refrigerator can be improved and dryness inside the refrigerator can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the low-temperature refrigerator of the present invention, and FIG. 1 is an electric circuit diagram, FIG. 2 is a temperature characteristic diagram inside the refrigerator, FIG. 3 is a vertical cross-sectional view of the low-temperature refrigerator, and FIG. 4 is a front view of the main parts. FIG. 5 is a vertical sectional view of another embodiment corresponding to FIG. 3. FIG. 6 is an electrical circuit diagram of another embodiment corresponding to FIG. 1. (51...interior, (6)...cooler, α5)...
・Blower fan. Applicant Sanyo Electric Co., Ltd. 1 other agent Patent attorney 4th R.I. Nishino 4th rI! J gS5 Figure Top 16

Claims (1)

[Claims] 1. A plate-shaped cooler that cools the inside of the refrigerator, a blower fan that stirs the cold air that has been heat exchanged with this cooler, and this blower fan that operates intermittently, and a stop time that is longer than the operating time of this blower fan. A low-temperature refrigerator equipped with a control device that lengthens the temperature.