JPS5930981B2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerator that concentrates frost formation in a freezer compartment in one place.

In general, in a so-called direct cooling type refrigerator, in which the freezing cooler is formed into a substantially rectangular box shape so as to form the wall of the freezing chamber, and the inside of the box is used as the freezing chamber, the freezing chamber is formed from approximately the entire inner surface of the freezing chamber. I try to cool it evenly.

However, during cooling operation, frost adheres to almost the entire inner surface of the refrigeration cooler, and the frost acts in an adiabatic manner, resulting in a decrease in cooling efficiency, and also has the disadvantage that frost adheres to the contents such as ice cube trays. .

In addition, when defrosting operation is performed, the power is temporarily turned off to stop the cooler operation, or the frosted walls are heated with a heater, but this means that the entire freezer compartment is heated. It has the disadvantage that it can even melt frozen food indoors.

To compensate for this drawback, the frozen food in the freezer compartment may be temporarily stored in the refrigerator compartment; however, this method has drawbacks such as being time-consuming.

The present invention has been made in order to solve the various drawbacks mentioned above, and its purpose is to improve refrigeration efficiency by concentrating frost formation in the freezer compartment in one place without adversely affecting other parts. In addition, it is possible to promote the concentrated action of frost formation as described above with an extremely simple structure,
Moreover, it is an object of the present invention to provide a refrigerator that can improve the usability of the freezer compartment.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes an insulated box whose interior is partitioned into an upper freezer compartment 3 and a lower refrigerator compartment 4 by an insulating partition wall 2 A cooler 6 for the refrigerator compartment is arranged in an inclined manner at the upper part of the interior of the refrigerator compartment 4.

A drain receiver 7 is provided at the lower part of the refrigerator compartment cooler 6 so as to face it from below, and water caused by defrosting passes through the rear wall of the insulation box 1. The liquid is guided out of the refrigerator through a pipe 8 provided in the refrigerator, and further flows down inside a pipe 9 to be guided into an evaporation tray 10 disposed at the lower part of the heat insulating box 1.

On the other hand, reference numeral 11 denotes a partition plate disposed so as to divide the interior of the freezer compartment 3 into a frozen material storage section 12 at the front and a non-accommodation section 13 at the rear between the inside of the freezer compartment 3 and the rear side wall surface. 7 so that a gap exists between the upper and lower walls of the freezer compartment 3 and the upper and lower walls of the freezer compartment 3.
Therefore, these spaces are used as an upper vent 14 and a lower vent 15, respectively, which communicate between the frozen material accommodating part 12 and the non-accommodating part 13.

Note that the volume of the non-accommodating portion 13 is set to be sufficiently smaller than that of the frozen material accommodating portion 12.

Therefore, 16 is a second tube disposed vertically in the non-accommodating portion 13 so as not to come into contact with the wall surface of the freezer compartment 3 and the partition plate 11.
This is a cooler, and this will be described below.

That is, this second cooler 16 is a pipe bent into a meandering shape, and as shown in FIG.
o is relatively smaller than the height dimension h1 of the freezer compartment 3, and its vertical center position (second
It is arranged so that point A in the figure) is above the vertical center position of the non-accommodating portion 13 (point B in FIG. 2).

Therefore, the second cooler 16 is located in the upper part of the non-accommodating part 13, and its center position A is located at the bottom surface of the freezer compartment 3.
1- to H=-+-.

In addition, a water receiving gutter 17 is provided in the non-accommodating part 13 so as to face the second cooler 16 from below, and the water accompanying the defrosting of the second cooler 16 is collected from this water. The receiving gutter 17 is also guided outside the refrigerator through a pipe 18 provided through the rear wall of the heat insulating box 1, and further guided into the evaporating dish 10 from the pipe 9.

In addition, 19 and 20 are a door for a freezer compartment and a door for a refrigerator compartment, respectively.
21 is a compressor, and 22 is a capacitor.

Now, the above-mentioned first cooler 5. Refrigerator cooler 6. Second cooler 16. Compressor 21 and capacitor 22
are connected as shown in FIG. 3 to form a refrigeration cycle.

That is, the high temperature and high pressure refrigerant compressed by the compressor 21 (
For example, Freon R-12) is liquefied in the condenser 22 and the first capillary tube 23, and then flows into the first branch path 24a and the second branch path 24t, respectively.

Then, the refrigerant that has flowed into the first branch path 24a is transferred to the solenoid valve 2.
When the solenoid valve 5 is open, it flows into the refrigerator compartment cooler 6 and the first cooler 5 in order and reaches the pressure regulator 26 while evaporating inside each, and when the solenoid valve 25 is closed, The second capillary tube 27 flows into the first cooler 5 from the intervening bypass path, and reaches the pressure regulator 26 while evaporating internally, and then returns from the pressure regulator 26 to the compressor 21.

On the other hand, the refrigerant that has flowed into the second branch path 241 is reduced in pressure by the third capillary tube 28 to approximately the same pressure as the outflow side of the pressure regulator 26, and then flows into the cooler 16 of the tube 2. It returns to the compressor 21 while evaporating, and this cycle is repeated thereafter.

At this time, the internal pressures of the refrigerator compartment cooler 6 and the first cooler 5 are approximately the same, so the surface temperatures thereof are approximately the same - 25°C. By setting the area etc. appropriately, the inside of the refrigerator compartment 4 can be heated to +3℃,
The inside of the freezer compartment 3 is configured to have a temperature of about 120°C.

In addition, in the second cooler 16, the internal pressure is lower than that in the respective coolers 6 and 5, and Freon, which is a component of the refrigerant, has the property of evaporating at a lower temperature as the pressure is lower. The surface temperature of the first cooler 16 is about -30° C., which is lower than that of the first cooler 5.

By the way, when operated in the cycle described above, the refrigerator compartment 4
Although the inside and the inside of the freezer compartment 3 are gradually cooled,
At this time, since the second □ cooler 16 exhibiting a lower temperature is located above the non-accommodating part 13, a vertical temperature difference occurs within the non-accommodating part 13, and as a result, the inside of the freezer compartment 5 is Natural convection as shown by A, that is, frozen material storage section 12
Convection is generated in a path in which air flows into the non-accommodating part 13 through the upper vent 14 and then returns into the frozen material accommodating part 12 from the lower vent 15.

- When the temperature inside the freezer compartment 3 falls below 0°C, frost adheres to the inner walls and the surfaces of the stored items.

However, as mentioned above (from the surface temperature of the first cooler 6,
Since the surface temperature of the second cooler 16 is set to be lower, the frost adhering to the inner wall and the surface of the stored items gradually sublimates and vaporizes, and this vapor is transferred to the self-contained convection tank mentioned above. and move into the non-accommodating part 13, where the second cooler 1
Frost forms on the surface of 6.

In this case, natural convection also promotes the sublimation of frost adhering to the surfaces of the stored items, etc., and these frosts quickly move to the surface of the second cooler 16.

Therefore, in a steady state, only the surface of the second cooler 16 is where frost forms in the freezer compartment 3 .

Therefore, when the surface of the second cooler 1G reaches a predetermined frost thickness, if the electric heater 29 attached to the second cooler 16 is energized, the frost will melt and fall into the water receiving gutter 17, causing the pipe 1
8 and 9 flow down into the evaporating dish 10 and evaporate.

At this time, the electric heater 29 may be set to be turned off once the defrosting of the cooler 16 has been completed by an appropriate amount.

According to the present embodiment described above, the inside of the freezer compartment 3 is partitioned into the frozen food accommodating section 12 that directly accommodates frozen items such as food, and the non-accommodating section 13 that communicates with this. Since the second cooler 16 that is cooled to a lower temperature is arranged to concentrate frost formation on the second cooler 16,
It is possible to reliably prevent the formation of frost on the walls of the freezer compartment 3 and the surfaces of the stored items, thereby preventing frost from acting as an insulator as in the past, thereby improving refrigeration efficiency. obtain.

Additionally, an upper vent 14 and a lower vent 15 are provided to communicate between the frozen material storage section 12 and the non-accommodation section 13 at their upper and lower portions, and the second cooler 16 is connected to the non-accommodation section 1.
Since natural convection is actively generated in the freezer compartment 3 by placing it above the second cooler 16, this convection can promote the concentration of frost on the second cooler 16, and the storage contents Even if frost forms on the surface of the stored items, such as immediately after the box is stored, the natural convection will quickly move the box to the non-storage area 1.
3 to the surface of the second cooler 160 in the second cooler 160, and the time required not only for dehumidification but also for freezing can be shortened.

Moreover, since the above-mentioned convection can be generated without using a fan or the like, the structure does not become complicated.

The strength of natural convection depends on the air pressure difference caused by the difference in air density caused by the difference in upper and lower temperatures, and the pressure difference P is expressed as P = kH (r 2 - r 1). be done.

Claims (1)

[Claims] 1. A first cooler provided to form a wall of the freezing chamber;
A partition plate that divides the freezer compartment into a frozen food storage area and a non-housing area between the side walls of the freezer compartment, and an upper vent that communicates between the frozen food storage area and the non-housing area above and below the people. and a lower vent hole, and a second cooler provided in the non-accommodating part and exhibiting a lower temperature than the first cooler, wherein the second cooler has a center position in the vertical direction that is located in the non-accommodating part. A refrigerator characterized in that the refrigerator is arranged above the center position in the vertical direction of the refrigerator.