JPS6144275A - 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 a refrigerator whose interior is indirectly cooled by a fan.

Conventional structure and its problems In the conventional fin-tube type cooler used in refrigerators, the intake side of the cooler where the cold air that cooled the inside of the refrigerator returns is concentrated compared to other parts. frost forms on the ground, and the air passage area becomes narrower. Therefore, the air velocity at the suction port of the cooler decreases, the air path resistance increases significantly, and the amount of air passing through the cooler rapidly decreases, resulting in a significant decrease in cooling efficiency.

For the reason mentioned above, when defrosting the cooler, the frost concentrated in one place on the suction port side falls to the bottom of the cooler, which worsens the boxing effect, and the heating pipe for defrosting is This has the problem of requiring a large amount of heat, which goes against energy conservation.

OBJECT OF THE INVENTION The present invention solves these conventional problems,
The purpose is to provide a refrigerator that improves cooling efficiency and contributes to power savings during defrosting.

Structure of the Invention In order to achieve this object, the present invention provides a fin-tube type cooler consisting of a meandering refrigerant pipe and radiation fins arranged orthogonally to the refrigerant pipe. A bypass air passage is formed opposite to the cooler, and a damper mechanism is provided to open and close the bypass air passage, and the damper is opened when frost forms on both ends of the cooler.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1st
In the figure, reference numeral 1 denotes a refrigerator body, which is formed by a freezing chamber 2, a refrigerating chamber 3, and a partition wall 4. A fin-tube type cooler 6 is vertically provided on the back side of the freezer compartment 2, and a partition plate 6 is provided on the front side of the refrigerator compartment 2 over two sides and the entire bottom surface.

Further, the partition wall 4 is formed with a duct portion 7 having suction ports 13 and 14 that communicate with the ventilation inlet side of the cooler 5 at one end and communicate with the freezer compartment 2 and refrigerator compartment 3 at the other end, respectively. 8
The cold air cooled by the cooler 6 is sent to the freezer compartment 2. This is a fan that forcibly circulates the air into the refrigerator compartment 3.

The six coolers include a refrigerant pipe 10 bent in a meandering manner as shown in FIG. It is formed by a heat dissipation fan 12 arranged orthogonally.

Next, FIG. 3 is a perspective view of the essential parts of the duct section, which consists of a refrigerator compartment duct 7a at the center and freezer compartment ducts 7b at both ends thereof. A damper mechanism 16 (a motor or the like 15c drives a cam 16b to open and close a damper 15a) is provided to form a bypass air passage 9 facing the center of the cooler 5 and to open and close it. .

In this configuration, during normal cooling motion, the bypass air passage 9 is closed, and the cold air circulating in the refrigerator compartment is passed through the refrigerator compartment duct 7.
The cold air circulated in the freezer compartment passes through the central part of the cooler 5 from the freezer compartment duct 1-7b and mainly passes through both ends of the cooler. The air is then discharged into the freezer compartment 2 by the fan 8 at the top of the cooler, and a portion of it is discharged into the refrigerator compartment 3.

Next, Fig. 4 is a cross section taken along line A-A' in Fig. 1, and shows that frost formation begins more intensively on the suction port side A of the cooler 6, where the cold air that has cooled the refrigerator compartment returns, compared to other parts. The air speed on the suction side of the device 5 is high, and the air volume decreases rapidly.

Therefore, frost builds up in the lower part of the cooler, and when it is about 60% clogged, the frost sensor 16 detects frost, and damper 15a
By opening it, cold air flows through the bypass air passage 9 and promotes heat exchange in the upper part of the cooler. Then, when the cam 16b of the damper mechanism 16 rotates once and the center of the cooler is completely clogged, the damper 15a closes again (at this time, the center of the cooler is evenly distributed). (Frost has formed and the container is almost 100% clogged.) Not only the return cold air from the freezer compartment 2 but also the return cold air from the refrigerator compartment 3 begins to pass through both ends of the cooler where the air path resistance is low.

In this way, the amount of frost formed on the entire cooler can be made uniform, and the air volume can be kept constant without reducing the air speed on the suction side of the cooler.

FIG. 6 shows the operating state of the cooling operation of the present invention and the damper (drive device) unboxing time versus time.

Here, for example, the temperature of the refrigerator room is 10°C (the saturated vapor pressure is 9.21a)
rffHg) Freezer room temperature -18℃ (saturated vapor pressure 0,94
111WHq) and set the cooler surface temperature to -2.
Assuming that the temperature is 6° C. (saturated vapor pressure 0.47 mHg), water equivalent to 6° C. solidifies and forms frost, which adheres to the cooler 6. It is generally known that the wind resistance is proportional to the square of the wind speed, and that the wind speed is inversely proportional to the ventilation area if the air volume is constant.

However, during normal cooling operation, the bypass air passage 9 is closed, and the cold air circulating in the refrigerator compartment passes through the refrigerator compartment duct 7a and then mainly through the center of the cooler 6, and the cold air circulating in the freezer compartment passes through the freezer compartment duct 7a. ) 7b, and mainly passes through both ends of the cooler 6. The air is then discharged into the freezer compartment by a fan 8 at the top of the cooler, and a part of it is discharged into the refrigerator compartment 3, forming an air path for indirect cooling.

At this time, as mentioned above, the amount of frost that adheres to the cooler 6 is much larger in the refrigerator compartment than in the frozen part, so the cold air that has cooled the refrigerator compartment is concentrated on the suction port side of the cooler 6, where it returns compared to other parts. Frost begins to form. For example, when the frost sensor 16 detects frost formation at 60% frost, the damper 15a is opened for a certain period of time, allowing cold air to flow through the bypass air passage 9 and heat exchange through the upper part of the cooler 6. It promotes cooling and does not impede cooling efficiency. Next, after a certain period of time, the Dan 7 be.

The par 15a is closed again, and not only the return cold air from the freezer compartment 2 but also the return cold air from the refrigerator compartment 3 begins to pass through both ends of the cooler 5, which has a small air path resistance.

In this way, the amount of frost formed on the entire cooler can be made uniform, the cooling efficiency is not reduced, and therefore the frost removal effect is also excellent.

Effects of the Invention As is clear from the above embodiments, the present invention provides a fin-tube type cooler consisting of a meandering refrigerant pipe and radiation fins disposed orthogonally to the refrigerant pipe, and A bypass air passage is formed opposite to the central portion of the heat dissipation fin, and a damper mechanism is provided that opens and closes the bypass air passage depending on the frosting state of the cooler, thereby improving cooling efficiency. When defrosting a cooler, the frost concentrated in one place on the suction port side does not fall to the lower part of the cooler, contributing to power saving during frosting with excellent defrosting effect.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a refrigerator equipped with a fin-tube cooler according to an embodiment of the present invention, FIG. 2 is a partial perspective view of the fin-tube cooler, and FIG. 4 is a sectional view taken along line 8-A' in FIG. 1, and FIG. 6 is an explanatory diagram of the operation. 6... Cooler, 8... Fan, 9... Bypass air path, 10... Refrigerant pipe, 12... Radiation fin, 16... Damper mechanism. Name of agent: Patent attorney Toshio Nakao and 1 other person
ward-dai

Claims (1)

[Claims] A fin-tube type cooler is provided, which consists of a refrigerant pipe bent in a meandering shape and radiation fins arranged orthogonally to the refrigerant pipe, and a fan is provided at the top of the cooler, and a fan is provided in the center of the radiation fin. A bypass air path is formed opposite to the
The refrigerator further includes a damper mechanism that opens and closes the bypass air passage depending on the frosting state of the cooler.