JPS6218942Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a refrigerator-freezer, and particularly relates to an air passage structure for forced cold air circulation.

In general, the cooling system of this type of refrigerator is configured to send cool air cooled by a blower into a freezer compartment and a refrigerator compartment to cool stored food.

A conventional air passage structure for circulating cold air was as shown in FIGS. 1 and 2. That is, the cold air path from the cooling compartment 9 to the refrigerator compartment 6 is provided by a blower 11 installed above the cooler 10 installed at the back of the freezing compartment, and an air outlet opened in the rear wall of the freezing compartment via a bell mouth portion 12a. The air is blown into the refrigerator compartment 6 through a back duct 14 formed on the back of the inner box. The air is then blown out from the rear duct outlet to a control box 17 installed inside the back of the cooling chamber, and a damper-type temperature regulator 1 installed inside the control box.
6, the air outlet 17a formed on the front side of the control box and the air outlet 17b formed on the lower side.
A predetermined amount of cold air is sent into the refrigerator compartment.
After being circulated within the refrigerator, the blown-out cold air is sucked in from the front lower surface of the partition, guided to the cooling chamber 9, and cooled again.

Further, in order to make the temperature distribution state in the freezer compartment 5 and the refrigerator compartment 6 uniform, the cold air outlet to each compartment is located approximately at the center of each compartment. That is, in order to rotate the blower 11 approximately at the center of the entire width of the main body, the rear duct 14 communicating with the inside of the refrigerator is provided at the upper center of the back of the refrigerator compartment after hanging down one side of the blower and bending at a predetermined position. It is designed to open inside the control box.

In the rear duct 14 configured in this way, the rear duct is disposed within a foam insulation material such as polyurethane, and the duct surface that is in contact with the foam insulation material and the cooling chamber side at the back of the freezer compartment are On the facing duct side, of course, when the blower is sending cold air into the freezer compartment and refrigerator compartment,
No problems occur due to the difference in heat capacity between the so-called normal operation when the blower is stopped and the stopped state, but if the rotatable doors of the freezer and refrigerator compartments are forgotten for a long time, When the temperature is close to high humidity, as shown in FIG. 1, the outside air enters through the front air outlet of the control box 17 located in the upper center of the refrigerator compartment, passes through the damper 16a of the damper type temperature controller, and enters the air outlet of the rear duct 14. It will rise from 15. Then, the humid outside air condenses or forms frost on the cooler parts of the wall inside the rear duct. Although the same phenomena and results as those described above occur in the case of forgetting to close the door on the freezer compartment side, forgetting to close the door on the refrigerator compartment side is generally more severe.
When defrosting of the cooler 10 is started while the inside of this duct is in a state of condensation or frost, the inside of the duct also warms up as shown in FIG. The frost that has formed will melt and flow downward along the duct wall. At this time, at the duct outlet, the damper 16a of the damper-type temperature regulator has a large upper opening and a lower opening close to the duct outlet, so that the drain water flows between the lower part of the damper and the duct outlet. There was a problem in that the drain accumulated at the outlet due to surface tension, and when the cooling operation was started again, the accumulated drain would freeze and the damper 16a would remain open, resulting in a phenomenon in which the refrigerator compartment became too cold.

This invention aims to eliminate the above-mentioned drawbacks.

Hereinafter, this invention will be explained in detail based on the embodiment shown in FIG. 3. 1 is a refrigerator main body, an inner box 2 made of synthetic resin, an outer box 3 made of steel plate, and a polyurethane foam etc. It is filled with a foamable heat insulating material 4. Reference numeral 7 denotes a partition that divides the inner box 2 into a freezer compartment 5 and a refrigerator compartment 6, and the outside of the heat insulating material is covered with resin. Reference numeral 8 denotes a fan grill, which has a freezer compartment cold air blowing part 8a at the upper part and a freezer compartment cold air suction part 8b at the lower part, and defines a cooling compartment 9 at the rear of the freezing compartment 5. 10 is a cooler arranged in this cooling chamber, 11 is a blower installed above this cooler, 12 is a casing made of a heat insulating material,
A bell mouth portion 12a for a blower is opened above the fan grille 8 so as to overlap it.
Moreover, on one side thereof, an air passage is formed which communicates with a rear duct which will be described later. Reference numeral 14 denotes a rear duct which is connected to the air outlet 12b of this air passage and whose other end is opened at the refrigerator compartment duct air outlet 15, which forms the inner box 2 in a concave shape and prevents moisture from entering the front surface on the freezer compartment side. It is surrounded by a thin plate 13 with good thermal conductivity for the purpose of concentrating dew or frost formation on the outside air. Reference numeral 20 denotes a drain receiving part formed by recessing the upper part of the rear end 7a of the partition 7 at the lower part of this thin plate, and is designed to temporarily store drain water flowing down one side of the duct. 16 is a damper type temperature regulator having a damper 16a that freely opens and closes the duct outlet; 17 houses this damper type temperature regulator;
It is a control box equipped with a front air outlet 17a and a lower air outlet 17b, and is provided above the center of the back of the refrigerator compartment 6. Reference numeral 18 denotes a suction port opened on the front lower surface of the partition 7. A defroster heater 19 is installed below the cooler 10, and is turned on after a certain period of time has elapsed based on the cumulative operation time.

Next, to describe the effect of this invention, as mentioned above, the freezer compartment 5 or the refrigerator compartment 6
If either the rotatable door 5a or 6a that covers the front of the cooler is forgotten to close for a long time in a humid environment, the blower 11 disposed above the cooler 10 will stop rotating. Since the compressor is stopped, even if it is operated, the freezer compartment 5 and refrigerator compartment 6
becomes uncool. Furthermore, since the refrigerant flows through the cooler 10, frost begins to form, and the temperature in the cooling chamber 9 becomes lower as cold air accumulates in the lower part due to natural convection. In this invention, a part of the back duct 14 located at the back of the cooler 10 is replaced with a thin plate 13 having good thermal conductivity.
Therefore, humid outside air that enters when the door is forgotten to close enters through the front air outlet of the control box located at the center of the upper part of the refrigerator room and forms frost on the back surface of the thin plate 13 of the back duct where the temperature is low. After that, when defrosting the cooler by energizing the defrost heater installed below the cooler due to operation integration, the frost on the back of the thin plate of the duct melts and flows along the thin plate to the drain receiver on the lower side. It accumulates in the department. Then, when the cooling operation is started again, the dew accumulated in the drain receiving part 7c will freeze, so ice will form between the duct outlet and the damper of the damper-type temperature controller, making it impossible for the damper to rotate. The problem that occurs can be resolved. Moreover, since the ice that has frozen inside the drain receiving section is sublimated by the cold air blown out from the blower, normal and stable cooling is possible.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a refrigerator, FIG. 2 is a sectional view of a main part of a conventional refrigerator, and FIG. 3 is a sectional view of a main part of a refrigerator showing an embodiment of this invention. In addition, the same reference numerals in the figures indicate the same or equivalent parts, 1 is the refrigerator main body, 5 is the freezer compartment, 6 is the refrigerator compartment, 7 is the partition, 11 is the blower, 13 is the thin plate, 1
4 is a rear duct.

Claims (1)

[Scope of utility model registration request] The inside of the refrigerator body is divided into upper and lower parts by a partition part to form a freezer compartment and a refrigerator compartment, and has a rear duct on the back side that communicates with both compartments, and through this duct cool air is sent to the freezer compartment and the refrigerator compartment by a blower. A forced draft type refrigerator-freezer that blows air, characterized in that the front part of the back duct of the freezer compartment is formed of a thin plate of a material with good thermal conductivity, and a drain receiving part is provided below the front part of the back duct. road structure.