JPS61140771A - Refrigerator - 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 Field of the Invention The present invention relates to an improvement in a refrigerator that uses a fan to forcibly cool the inside of the refrigerator.

Conventional structure and its problems Conventionally, frost forms on the fins of this type used in refrigerators, etc., so the air passage through which cold air flows becomes narrow even though other parts are free of frost. .

Therefore, when frost builds up on the cooler, the ventilation resistance increases significantly, and the amount of air passing through the cooler drops sharply, resulting in a significant drop in cooling efficiency.

Also, if the cooler is used vertically, the frost on the top during defrosting will fall downward and land again on the refrigerant pipes at the bottom where defrosting has already been completed, resulting in poor defrosting effectiveness. This has the problem that the number of times the heater is heated is large, which is contrary to power saving.

Purpose of the Invention The present invention solves these conventional problems, improves cooling efficiency, reduces the number of times the heater is heated for defrosting,
The purpose is to provide a refrigerator that contributes to power saving.

Structure of the Invention In order to achieve this object, the present invention provides a vertically elongated fin-tube type cooler in the cooler chamber. It is equipped with a large number of radiation fins arranged perpendicularly to the tube and arranged in parallel, and a heating tube which is installed in parallel with the refrigerant pipe and intersects with the radiation fins. The fins are dense and have a lower height than the center fin height, and a bypass air passage for circulating cold air is provided opposite the sparse fin pitch area.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, 1 is the main body of the refrigerator, which has a freezer compartment 2, a refrigerator compartment 3, and a partition wall 4.
It is formed by A fin-tube type cooler 5 is provided vertically on the back side of the freezer compartment 2, and a partition plate 6 is provided on the front side thereof.
A duct portion 7 is formed which has suction ports 13 and 14 whose other ends communicate with the freezer compartment 2 and the refrigerator compartment 3, respectively.

A fan 8 forcibly circulates the cold air cooled by the cooler 5 into the freezer compartment 2 and the refrigerator compartment 3.

The cooler 6 includes a refrigerant pipe 10 bent in a meandering manner as shown in FIG. It is formed of a plurality of heat dissipating fins 12 arranged in a shape. The heat dissipation fin 12 has a sparse pitch of heat dissipation fins in the center so that the ventilation resistance J- is achieved.
A fin-chip type cooler 5, consisting of a group of radiating fins 12b, which are densely packed on both sides with high ventilation resistance and lower than the fin height in the center, and arranged parallel to the ventilation path. It is arranged so as to be parallel to the direction in which the air flows by the fan 8.

Here, the cold air returned from the freezer compartment passes through the freezer compartment duct, undergoes heat exchange mainly at both ends of the cooler, and is discharged by a fan to cool the freezer compartment. A part of the cold air in the freezer compartment is directed to the refrigerator compartment through the entire air path of the refrigerator compartment and is discharged by a fan.

Page 5 Therefore, while both ends of the cooler work to cool the freezer compartment, the center part of the cooler works to cool the refrigerator compartment, making it possible to reduce the fin pitch, resulting in improved heat exchange. Since the area is a dog, the fin height is set low. The duct section 7 consists of a refrigerator compartment duct) 7a in the center and a freezer compartment duct 7b at both ends thereof. The radiation fin group 12 is arranged parallel to the ventilation path.
b can be arranged, and a bypass air path is formed facing the radiation fin group 12a. In this configuration, the return cold air from the refrigerator compartment enters from the ventilation inlet side A of the cooler 5 through the refrigerator compartment duct Tai, and enters the cooling fin group 12.
The path for heat exchange in a circulates through the shortest part. The cold air returned from the freezer compartment passes through the freezer compartment ducts b2 at both ends, enters from the ventilation inlet side B of the cooler 5, and exchanges heat with the radiation fin groups 12b at both ends of the cooler 5, respectively.

Here, for example, the temperature in the refrigerator compartment is 10°C (saturated vapor pressure 6 9.21 mHf), the temperature in the freezer compartment is -18°C (saturated vapor pressure 0
．． 94mmHf') and set the cooler surface temperature to -2.
Assuming 5℃ (saturated vapor pressure 0.47 mmHf), refrigerator compartment = vapor pressure difference 8.74 mmHt) 1g (9,21 + n + rlHf - 0,47 mmHt) freezer compartment = vapor pressure difference 0.47 mmH2 (0, The moisture corresponding to the 94 end Hf -0,47#H?) solidifies, becomes frost, and adheres to the cooler.

Therefore, in the cooler 5 of the present invention, the radiation fin group 12ai parallel to the ventilation path from the refrigerator compartment is made sparse, and the radiation fin group 12bi parallel to the ventilation passage from the freezer compartment is made dense, and the heat exchange area is kept to the minimum necessary. This is what I did. Furthermore, by forming a bypass air passage facing the radiation fin group 12a of the cooler 6, heat exchange is performed on the humid air in the refrigerator compartment, so that even if there is a lot of frost on the suction port side, the air passage area is heat is exchanged with the upper part of the cooler through the bypass air path.

As a result, the amount of air flowing through the cooler 5 can be made uniform, and the cooling efficiency can be improved significantly.

7Peno In addition, since frost does not concentrate on the suction port, heating pipe 1 for defrosting
1 can be made small, contributing to power saving.

In addition, the frost that accumulates above can easily flow downward due to the sparse portions, so it does not freeze below.

Effects of the Invention As is clear from the above embodiments, the present invention includes a refrigerant pipe bent in a meandering manner, and a large number of heat dissipation fins arranged orthogonally to the refrigerant pipe. A fin-tube type cooler with a sparse radiating fin pitch, denser fins on both sides, and lower than the fin height in the center, and a bypass air path opposite the part of the cooler with a sparse radiating fin pitch. As a result, the amount of frost that adheres to the cooler can be made uniform, and the amount of heat in the heating tube 11 for defrosting can be reduced, which contributes to improving the efficiency of the cooler and saving power during defrosting. It is something to do.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a refrigerator equipped with a fin-tube type cooler which is an embodiment of the present invention, Fig. 2 is a partial perspective view of the fin-tube type cooler which is a part of the present invention, and Fig. 3 1 is a perspective view of the main part of FIG. 1, and FIG. 4 is a sectional view taken along the line a-a' in FIG. 5...Cooler, 9...Bypass air path,
10...Refrigerant pipe, 12, 12a, 12b...
- Heat dissipation fin.

Claims (1)

[Claims] A cooler is formed by a refrigerant pipe bent in a serpentine shape and a large number of radiation fins arranged orthogonally to the refrigerant pipe and arranged in parallel, and the pitch of the radiation fins in the center of the cooler is made sparse. A refrigerator characterized by having a bypass air passage for circulating cold air opposite to a part of the cooler which has dense fins on both sides, is lower than the height of the fins in the center, and has a sparse pitch of radiation fins.