JPS6221897Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a refrigerator that prevents defrosting water from a freezing compartment from freezing in a drain pipe.

Conventionally, in refrigerators that have a freezer compartment and a refrigerator compartment, a cylindrical drain pipe is provided to communicate the bottom of the freezer compartment and the top of the refrigerator compartment, and an electric heater is attached around the drain pipe. During operation, that is, during cooling operation, moisture, defrost water, etc. freeze in the upper part of the drain pipe, thereby blocking the drain pipe and cutting off the communication between the freezer compartment and the refrigerator compartment. During defrosting, the electric heater is energized to generate heat to melt the ice at the top of the drain pipe and connect the freezer and refrigerator compartments. The defrosting water from the refrigerator is led to the water receiving gutter inside the refrigerator compartment through a drain pipe. By the way, according to the above-mentioned conventional configuration, the freezer compartment and the refrigerator compartment are in a non-communicating state during cooling operation, so there is a problem that the freezer compartment becomes negative pressure and it becomes difficult to open the freezer compartment door. For this reason, in the past, the back of the freezer compartment and the back of the refrigerator compartment were communicated with each other through a small diameter communication pipe, and
An electric heater is attached around the communication pipe, and the electric heater is energized to generate heat during cooling operation to prevent the communication pipe from clogging due to freezing due to moisture or the like. However, in the above-mentioned conventional configuration, the freezer compartment and the refrigerator compartment must be connected through two routes, a drain pipe and a communication pipe, and an electric heater must be attached to each, resulting in a complicated configuration. However, it is expensive and requires an electric heater, which increases power consumption.

The present invention was developed in view of the above circumstances, and its purpose is to discharge defrosting water from the freezer compartment and communicate with the freezer compartment and refrigerator compartment using only one drainage pipe, and to To provide a refrigerator that can reliably prevent freezing of defrosting water in a drain pipe, has a simple structure and assembly, can be manufactured at low cost, and can save power.

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

1 is an outer box having a back plate 2; 3 is a plastic back plate 4 disposed at the upper part of the inside of the outer box 1;
A rectangular box-shaped freezer compartment cooler 5 has an inner box made of plastic, and a foaming heat insulator 6 is filled between these inner boxes. The inside of the inner box 5 is used as a refrigerator compartment 8.
A refrigerator compartment cooler 9 is disposed in the rear upper part of the refrigerator compartment 8 so as to be inclined downward toward the rear.
A water receiving gutter 1 is installed so as to face the rear end from below.
0 is placed. 11 is the back plate 2 of the outer box 1
This is a condenser pipe that is attached in a meandering manner to the inner surface of the refrigeration cycle, and together with a compressor (not shown), the freezer compartment cooler 3, the refrigerator compartment cooler 9, etc., it constitutes a well-known refrigeration cycle. The heat generated in the condenser pipe 11 when the compressor is driven is dissipated from the back plate 2.

Now, 12 is a drain pipe line, which is a first drain pipe 1 integrally formed at the lower end of the back plate 4.
3, a second drain pipe 14 made of a metal with a small heat capacity, such as aluminum, and a third drain pipe 15 made of a material with a large heat capacity, such as plastic. The front opening opens downward and communicates with the inside of the freezer compartment 7, and the lower opening is formed with a square annular flange 13a, and the second drain pipe 14 and the third drain pipe 15 are rectangular. The third drain pipe 15 is formed into a cylindrical shape, for example, a square cylindrical shape, and the lower half of the third drain pipe 15 is formed into a tapered shape. The upper end of the second drain pipe 14 is fitted and connected to the flange 13a of the first drain pipe 13, and the lower end of the second drain pipe 14 is inserted into the upper half of the third drain pipe 15. The tapered lower end of the third drain pipe 15 airtightly passes through the upper surface plate 5a of the inner box 5 and connects to the rear end of the refrigerator compartment cooler 9 in the refrigerator compartment 8. They are designed to face each other from above. 16 is a heat transfer member;
This is formed by bending a long belt-shaped plate made of aluminum, and after bending heat transfer parts 16b, 16b, which are both ends of a relatively long heat receiving part 16a, so that they approach each other, The heat transfer portions 16b, 16b are curved parallel to each other, and have a generally looped shape with a U-shaped contact portion 16c at the tips of the heat transfer portions 16b, 16b. The heat transfer member 16 is attached by welding so that the contact portion 16c on one side contacts the outer surface of the three side walls of the second drain pipe 14, and the heat receiving portion 16a on the other side contacts a part of the condenser pipe 11. It is arranged in the heat insulating body 6 in this manner.

In addition, in the above case, the second drain pipe 14 is
The length dimension a of one side is set to 24 mm, and the height dimension b is set to 70 mm. d is set to 50 mm, the length e of the parallel part of the heat transfer part 16b is set to 31 mm, and the width (height) dimension f is set to 30 mm. Therefore, the total length of the contact part 16c is set to the second The length is 72 mm, which corresponds to the length of three sides of the drain pipe 14.

Therefore, when the compressor (not shown) is driven, that is, during cooling operation, a part of the heat of the condenser pipe 11 is received by the heat receiving part 16a of the heat transfer member 16 and transferred to the second heat transfer part 16b, 16b. Therefore, the second drain pipe 14 is heated by the heat of the condenser pipe 11, and the defrosting water flowing down the drain pipe 12 during defrosting is transferred to the second drain pipe 14. Even if water droplets remain in a drain pipe 14, they are prevented from freezing and gradually becoming larger.

According to this embodiment, the following effects can be obtained. That is, the lower back part of the freezer compartment 7 and the upper back part of the refrigerator compartment 8 are communicated with each other through a drain pipe line 12 consisting of first, second, and third drain pipes 13, 14, and 15, and the second drain pipe Since the heat from the condenser pipe 11 is transferred to the condenser pipe 14 through the heat transfer member 16, during defrosting, the defrosting water from the freezer compartment 7 is transferred to the water receiving gutter in the refrigerator compartment 8 via the drain pipe 12. 1
Furthermore, during the cooling operation, the defrosting water remaining in the drain pipe 12 can be prevented from freezing, and the freezer compartment 7 and the refrigerator compartment 8 can be kept in communication with each other. This can prevent the inside of the freezer compartment 7 from becoming negative pressure and prevent the freezer compartment door (not shown) from becoming difficult to open. Since the lower half of the drain pipe 15 is tapered, cold air convection between the freezer compartment 7 and the refrigerator compartment 8 can be prevented as much as possible. Therefore, the single drainage pipe 12 can both discharge the defrosting water from the freezer compartment 7 and communicate the freezer compartment 7 and the refrigerator compartment 8, making the structure simpler and cheaper than before. Moreover, the heat of the condenser pipe 11 can be transferred to the second pipe by the heat transfer member 16.
Since the power is transmitted to the drain pipe 14 of the heater, the wiring work during assembly can be simplified compared to the conventional method that uses an electric heater, and there is no need to consider electrical insulation, making the structure even simpler and cheaper to manufacture. Moreover, by not using an electric heater, it is possible to save power. Furthermore, since the upper end and lower end of the second drain pipe 14 having heat conductive properties are connected to the first drain pipe 13 and the third drain pipe 15, respectively, which have heat insulating properties, the second drain pipe 14 The heat transferred to the freezer compartment 7
This can reliably prevent the heat from being transmitted to the refrigerator compartment 8. The second drain pipe 14 is formed into a square cylindrical shape, and heat transfer members 1 are provided on the outer surface of the three side walls.
Since the contact portion 16c of No. 6 is brought into contact,
The contact area between the second drain pipe 14 and the heat transfer member 16 can be made relatively large. Now, the heat transfer member 16 of the present embodiment shown in FIG.
A comparison will be made with the case where the contact portion 18a of the heat transfer member 18 is brought into contact. In this case, the cross-sectional area of the second drain pipe 14 and the cross-sectional area of the drain pipe 17 are set to be equal, a ² =S=πr ² . Therefore, the length l ₁ of the contact portion 16c is l ₁ =3a=3√, and the contact portion 18
The length dimension l ₂ of a is l ₂ =πr=√, and the ratio l ₁ /l ₂ is approximately 1.7, and the contact area in this embodiment is approximately 70% larger. In addition, since the heat transfer member 16 is formed into a substantially loop shape that widens at the end, the heat receiving area of the heat receiving portion 16a relative to the condenser pipe 11 becomes large. Therefore, according to this embodiment, the heat receiving area of the heat receiving part 16a is large and the contact part 16
Since the contact area of c is large, the heat of the condenser pipe 11 can be effectively transferred to the second drain pipe 14, and the second drain pipe 14 can more reliably prevent the defrosting water from freezing. be able to.

In the above embodiment, the first drain pipe 13 is integrally molded at the lower end of the back plate 4, but it may be formed separately and attached to the lower end of the back plate 4. .

In addition, the present invention is not limited to the embodiments described above and shown in the drawings; for example, the second drain pipe of the drain pipe line is not limited to a square tubular shape, but may be formed into a rectangular tubular shape. It goes without saying that the present invention may be modified and implemented as appropriate without departing from the scope of the invention.

As explained above, the present invention is designed to connect the drain pipe that discharges defrosting water from the freezer compartment to the refrigerator compartment side with an insulating first pipe.
It consists of a drain pipe, a heat conductive second drain pipe in the shape of a rectangular cylinder, and an insulating third drain pipe with a tapered bottom. Since the heat transfer material is transmitted through a generally loop-shaped heat transfer member, it is possible to connect the discharge of defrosting water from the freezer compartment and the communication between the freezer compartment and the refrigerator compartment using only one drainage pipe route. It is possible to do both, and also to reliably prevent the defrosting water from freezing in the drain pipe.
It is easy to configure and assemble, can be manufactured at low cost, saves power, and also ensures that the heat of the second drain pipe is not conducted to the freezer and refrigerator compartments and causes adverse thermal effects. It is possible to provide a refrigerator that can prevent

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a vertical sectional side view of the main parts, FIG. 2 being a perspective view of the second drain pipe and the heat transfer member, and FIG. 3 being an explanatory view of the operation. In the drawing, 1 is an outer box, 2 is a back plate, 3 is a freezer cooler, 4 is a back plate (back), 7 is a freezer compartment, 8 is a refrigerator compartment, 11 is a condenser pipe, 12 is a drainage pipe, 13 is a first drain pipe, 14 is a second drain pipe,
15 is a third drain pipe, 16 is a heat transfer member, 16a is a heat receiving part, and 16c is a contact part.

Claims (1)

[Scope of utility model registration request] A condenser pipe is attached to the back plate of an outer box that has a freezer compartment and a refrigerator compartment formed therein through a heat insulator, and the defrosting water from the freezer compartment is discharged to the refrigerator compartment side through a drain pipe. In the apparatus, the drain pipe is connected to an insulating first drain pipe provided in a lower part of the back of the freezer compartment so as to communicate with the freezer compartment, and an upper end thereof is connected to the first drain pipe. a heat-conductive second drain pipe having a rectangular cylindrical shape; 3, a generally loop-shaped heat transfer member having a diverging shape and having a contact portion on one side in contact with the outer periphery of the second drain pipe and a heat receiving portion on the other side in contact with the condenser pipe. A refrigerator characterized by having: