JPS61291883A - Cooling device for refrigerator, etc. - 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 cooling device such as a refrigerator, and particularly relates to the shape and arrangement of the fins of the cooler.

2. Description of the Related Art In recent years, cooling devices such as refrigerators are desired to have as high a capacity as possible within a limited size. Hereinafter, an example of a conventional cooling device such as a refrigerator will be described with reference to sectional views of main parts of a conventional refrigerator shown in FIGS. 4 to 6.

1 is a refrigerator main body, 2 is a freezing compartment, 3 is a refrigerating compartment, and 4 is a dividing wall between the freezing compartment 2 and the refrigerating compartment 3, which has a cooling compartment 5 inside. Inside the cooling chamber 5, there are a cooler 6 that forms part of the refrigeration system, a fan 7 for forced ventilation of cold air, and a cooler 6.
There are heat insulating materials 8A and 8B provided at the upper and lower parts of the cooler 6, and the upper heat insulating material 8B has a gap between the notch 9 and the cooler 6, which extends halfway from the windward side to the leeward side of the cooler 6. A bypass air passage 10 is formed by this. Further, the upper end of the leeward side of the cooler 6 is in contact with the upper heat insulating material 8B, and the bypass air passage 10 is blocked. A drain pan 11 is disposed below the cooler 6 to distribute defrost water during defrosting.

Next, the cooler 6 will be explained. Reference numeral 12 denotes a large number of divided small piece fins, and a refrigerant pipe 13 is arranged approximately in the center thereof for heat exchange. Pipe heaters 14 are installed above and below the small piece fins 12.

Next, the flow of wind will be explained. Due to the operation of the fan 7, the air in the freezer compartment 2 passes through the freezer compartment side suction port 15,
In addition, the air inside the refrigerator compartment 3 passes through the refrigerator compartment side suction port 16, is sucked into the cooler 6 through the bypass air passage 10, flows as shown by the arrow, and then flows from the rear of the fan 7 into the fan duct 17.
The flow of air when frost has progressed to the ninth-order cooler 6, which is returned to the freezer compartment 2 and the refrigerator compartment 3 via the refrigerator compartment 3, will be explained. Frosting of the cooler 6 progresses from the air suction side 18 and gradually progresses to the air discharge side 19, and as the frosting progresses, the ventilation resistance of the cooler 6 increases. If the ventilation resistance on the suction side 18 of the cooler 6 increases in this way, the ventilation resistance balance with the bypass air path 10 will be disrupted, and the amount of air passing through the bypass air path 10 will increase due to the increase in the ventilation resistance on the suction side 18 of the cooler 6. The air volume on the suction side 18 of the cooler 6 decreases. At this time, the air volume on the discharge side 19 of the cooler 6 decreases slightly because the overall ventilation resistance increases slightly due to frost formation, but the cooling performance remains unchanged even if the frost formation progresses.
By setting it to 0, it can be maintained.

Problems to be Solved by the Invention However, in the above configuration, in order to maintain cooling performance during frost formation, a bypass air passage IO must be provided in the upper part of the cooler 6. The heat insulating material 8B on the top of the cooler 6 becomes thinner and a lot of frost forms on the top of the cooler 6, so pipe heaters 14 must be installed both above and below the cooling unit to defrost the freezer. There was a lot of heat influence on 2. In addition, the drain pan 11 for draining defrost water during defrosting is
A downward diagonal angle is required, and there is a problem in that the front wind speed decreases in the middle of the cooler, resulting in a decrease in heat transfer coefficient.

In view of the above-mentioned problems, the present invention provides a cooling device for a refrigerator or the like in which the cooling chamber is less affected by heat during defrosting.

Means for Solving the Problems In order to solve the above-mentioned problems, the cooling device for a refrigerator, etc. of the present invention has a large number of divided small pieces of fins, which are different in size in the vertical direction, on the windward side of the cooler. The cooler is arranged horizontally in the cooling chamber in combination only in the first row, the drain pan is installed at the bottom of the cooler, and the gap between the cooler and the drain pan is used as a bypass air path. It is something.

Effect of the present invention With the above-mentioned configuration, the conventional bypass air passage can be abolished, which increases the thickness of the insulation material in the upper part of the cooler and reduces frost formation on the upper part, so that the pipe heater can be connected to the lower part of the cooler. It can be installed only to enable defrosting,
The effect of heat on the freezer compartment during defrosting is significantly reduced.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. Components that are the same or almost the same as those of the conventional example (FIGS. 4 to 6) will be designated by the same numbers. Therefore, detailed explanation thereof will be omitted.

12a is a small piece fin that is smaller in height in the vertical direction than the small piece fin 12. In order to distinguish it from the small piece fin L2a, the small piece fin 12 will be hereinafter referred to as the larger small piece fin. 8 is a heat insulating material located above the cooler 6.

20 is a pipe heater, which is installed only at the lower part of the cooler 6.

Next, the operation of the above configuration will be explained.

In the cooler 6, the larger small piece fins 12 and the smaller small piece fins 12a are alternately combined only in the first row on the windward side, and the remaining rows are composed of only the larger small piece fins 12. be. And the smaller piece fin 12a
The lower end is located above the lower end of the larger small piece fin 12.

Further, a pipe heater 20 is installed between the larger fins 12 at the bottom of the windward side of the cooler 6. As a result, the pitch between the larger small fins 12 can be made seemingly larger, and even during frost formation, the ventilation resistance increases in the portion of the upper windward side 21 of the cooler 6 where the fin pitch is small. However, since the windward side lower part 22 has a large fin pitch, the ventilation resistance increases only slightly. In addition, by using the gap between the cooler 6 and the drain pan 11 as a bypass air path, in the event of frost formation, the upper windward side 21 of the cooler 6
As the ventilation resistance increases, the lower windward side 22 of the cooler 6
The amount of air passing through the gap between the cooler 6 and the drain pan 11 increases. At this time, the air volume on the discharge side 19 of the cooler 6 decreases slightly because the overall ventilation resistance increases slightly due to frost formation, but the cooling performance can be maintained to a large extent. By abolishing the conventional bypass air path in this way, the insulation material 8 above the cooler 6 becomes thicker, and the air flow uses the gap between the cooler 6 and the drain pan 11 as a bypass air path. Since a large amount of water flows, more frost forms at the bottom, and defrosting is possible by simply installing the pipe heater 20 at the bottom, which greatly reduces the thermal effect on the freezer compartment 2 during defrosting. It is.

Effects of the Invention As described above, the present invention has a cooler in which a large number of divided small pieces of fins of different sizes are combined only in the first row on the windward side of the cooler, which is placed horizontally in a cooling chamber. A drain pan is installed at the bottom of the cooler, and the gap between the cooler and drain pan is used as a bypass air path, so the effect of heat on the freezer compartment during defrosting can be significantly reduced.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a sectional view of essential parts of a refrigerator, Figure 2 being a perspective view of a cooler of the cooling device, and Figure 3 being a side view of the cooler. Figures 4 to 6 show conventional examples, with Figure 4 being a sectional view of the main parts of the refrigerator, Figure 5 being a perspective view of the cooler of the refrigerator, and Figure 6 being a side view of the cooler. be. 2... Freezer room, 3... Refrigerator room, 4... Compartment wall, 5
...Cooling room, 6...Cooler, 7...Fan, 8,
8B...Insulation material, 11...Drain pan, 12...
Larger small piece fin, 12a... Smaller piece fin, 13... Refrigerant pipe, 20... Pipe heater agent Yoshihiro Morimoto Figure 1 tr--Drain hole 0n 12--Missing 31 way o＼ vs. fin/2d-,-small'I S ;! j 471

Claims (1)

[Claims] 1. A cooler consisting of two types of divided small pieces of fins of different sizes in the vertical direction, a refrigerant pipe, and a pipe heater.
It is placed horizontally in a cooling chamber having a fan, a drain pan is installed at the bottom of the cooler, and only one row on the windward side of the cooler is constructed by combining the two divided small pieces of fins of different sizes. A cooling device for a refrigerator or the like that uses the gap between the cooler and the drain pan as a bypass air path.