JPH0771857A - Refrigerator - Google Patents

Abstract

PURPOSE:To exert a power saving effect to a satisfactory extent created by installing two refrigeration cycles and embody enhanced volume efficiency of a refrigerator body as well. CONSTITUTION:An evaporator 18 for a refrigerating chamber and an evaporator 19 for a cold storage chamber which each independent system-based refrigeration cycle for a refrigerating chamber and a refrigeration cycle for a cold storage chamber provide are installed in such a fashion that they may adjoin each other on both sides at the depth of the refrigerating chamber 12. A fan 20 for the refrigerating chamber and a fan 22 for the cold storage chamber generate an air flow circulating in the upper part while keeping contact with the equivalent evaporators 18 and 19, thereby supplying a cooled air from each of the evaporators 18 and 19 to the refrigerating chamber 12 and the cold storage chamber 13 respectively. Since an insulation parting member 17, whose inside is arranged as an air duct 17a, is laid out between the evaporators 18 and 19, the cooled air which is supplied into the cold storage chamber, is introduced into a vegetable chamber 14 by way of the air duct 17a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator in which the temperature control of a freezing compartment and a storage compartment is performed by a refrigerating cycle for the freezing compartment and a refrigerating cycle for the storage compartment which are independent of each other.

[0002]

2. Description of the Related Art In a refrigerator having a freezing compartment and a refrigerating compartment (storage room), generally, only one refrigeration cycle including a combination of a compressor, a condenser, an evaporator and the like is provided, and the cool air of the evaporator is supplied. A fan for circulating the inside of the refrigerator and a damper device for selectively supplying the circulating air to the refrigerating compartment are provided.

By the way, it is known to operate the refrigeration cycle at a high COP (coefficient of performance) to raise the evaporation temperature of the refrigerant as one of the conditions for improving the operation efficiency. On the other hand, as described above, in the refrigerator in which the evaporator in the refrigeration cycle is also used for cooling the freezing compartment and the refrigerating compartment, it is necessary to set the evaporation temperature in accordance with the cooling temperature of the freezing compartment. Since it is practically impossible to set a higher value, there is a problem that it is difficult to improve the operation efficiency of the refrigeration cycle and to realize power saving accordingly.

In order to deal with such a problem, conventionally, the refrigerating room and refrigerating room are temperature controlled by independent refrigerating room refrigerating cycle and refrigerating room refrigerating cycle, respectively. By increasing the refrigerant evaporation temperature on the room refrigeration cycle side and improving its operating efficiency, it is possible to achieve power saving for the entire refrigerator including the refrigeration cycle for the refrigeration room and the refrigeration cycle for the freezing room. Has been done.

Of the refrigerators having the two refrigeration cycles as described above, in particular, a refrigerator having a refrigerating compartment in the central portion and refrigerating compartments above and below the refrigerating compartment are It is considered to arrange the evaporator in the inside as shown in FIG.

That is, FIG. 5 shows a schematic front view of the refrigerator main body 1 with the door removed. The refrigerator main body 1 has a freezer compartment 2 arranged at the center thereof and the refrigerator is frozen. A refrigerating room 3 and a vegetable room 4 serving as storage rooms are arranged above and below the room 2. A freezing compartment duct (not shown) defined by a partition cover 2a is provided in the deep part of the freezing compartment 2, and the freezing compartment evaporator 5 included in the freezing compartment refrigeration cycle is provided in the duct. Will be placed. A refrigerating compartment duct (not shown) defined by a heat insulating cover 3a is provided at the back of the refrigerating compartment 3, and a refrigerating compartment evaporator 6 included in the refrigerating compartment refrigeration cycle is disposed in the duct. To be done.

In this case, each of the evaporators 5 and 6 is constructed so as to have a size corresponding to the heat load thereof, but in order to reduce the dead space generated on the left and right, the lateral size is set large. On the other hand, the shape is such that the dimension in the height direction is set small.

A freezer compartment fan 7 is provided at the center of the upper part of the freezer compartment duct. When the fan 7 is operated, the cool air in the freezer compartment evaporator 5 is
The air is supplied into the freezer compartment 2 through the blower port 2b. A refrigerating compartment fan 8 is provided at the center of the upper part of the refrigerating compartment duct. In the state in which the fan 8 is operated, the cool air of the refrigerating compartment evaporator 6 is blown by the blower port 3b.
Is supplied to the refrigerating compartment 3 via the
Is supplied into the vegetable compartment 4 through an air duct (not shown). The cold air supplied to the freezing compartment 2 or the refrigerating compartments 3 and 4 as described above passes through the air ducts (not shown) formed in the partition walls 9 and 10 between the compartments or the freezing compartment duct or It is designed to be returned to the refrigerator compartment duct.

[0009]

It is certain that the refrigerator configured as described above can promote power saving as compared with a refrigerator provided with only one refrigeration cycle, but the evaporators 5 and 6 are high in cost. Since it has a horizontally elongated shape with a small vertical dimension, an air flow vertically flowing in the freezer compartment duct and the refrigerating compartment duct as the fans 7 and 8 are operated,
The time for heat exchange with each of the evaporators 5 and 6 becomes short, and moreover, the amount of air flowing through the evaporators 5 and 6 is reduced.
There will be a large difference between the central part and the peripheral part. Therefore, it is unavoidable that the heat exchange efficiency is deteriorated, and it cannot be said that the power saving effect is sufficiently obtained.

Although the left and right dead spaces of the evaporators 5 and 6 are small, the upper and lower dead spaces of the evaporators 5 and 6 are inevitably large.
There is also a problem in that the volumetric efficiency of the refrigerator body is reduced. Moreover, the heat insulation wall of the refrigerating compartment 3 is essentially thinner than the heat insulation wall of the freezing compartment 2, but the refrigerating compartment 3 is not required.
Since the evaporator 6 for the refrigerating compartment is arranged in the inner part of the refrigerator, it is necessary to increase the thickness dimension of the heat insulating wall of the portion corresponding to the evaporator 6, and if the inner volume of the refrigerating compartment 3 is reduced accordingly. Inevitably, this also leads to a reduction in the volumetric efficiency of the refrigerator body.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to sufficiently exert the power saving effect of providing two refrigeration cycles and to improve the volumetric efficiency of the refrigerator body. To provide a refrigerator that will become.

[0012]

In order to achieve the above-mentioned object, the present invention comprises a freezing compartment arranged in the central portion and storage compartments having a set temperature higher than that of the freezing compartment above and below the freezing compartment. A refrigerator including a refrigerator main body, wherein the temperature control of the freezer compartment and each storage compartment is performed by an independent system refrigeration compartment refrigeration cycle and storage compartment refrigeration cycle The evaporator for the storage room and the evaporator for the storage room included in the refrigeration cycle for the storage room are arranged laterally adjacent to the inner part of the freezing room, and vertically flow while being in contact with the evaporator for the freezing room and the evaporator for the storage room. A freezing room fan and a storage room for supplying cold air from each evaporator to the freezing room and the upper storage room by generating an air flow. After arranging a room fan corresponding to each of the evaporators, the inside is arranged between the evaporator for the freezing room and the evaporator for the storage room, and the inside is configured as an air duct for guiding the cool air in the upper storage room to the lower storage room. A heat insulating partition member is provided (Claim 1).

In this case, the evaporator for the freezer compartment can be defrosted by the forced defrosting method by the heating means, and the evaporator for the storage room can be defrosted by the off-cycle natural defrosting method ( Claim 2).

Further, the dew-proof pipe for the freezer compartment is constructed by utilizing the heat-dissipating pipe in the freezer-cycle refrigeration cycle, and the dew-proof pipe for the storage room is used for heat-dissipation in the storage-room refrigeration cycle. It can also be configured by using piping (claim 3).

Further, an evaporation tray for receiving defrosting water from the evaporator for the freezing compartment and the evaporator for the storage compartment is provided, and as a heat source for evaporating the defrosting water in the evaporation tray, it is used for heat radiation during the refrigeration cycle for the storage compartment. It may be configured to use piping (claim 4).

[0016]

In the refrigerator according to the first aspect of the present invention, the temperature control of the freezer compartment and the storage compartments provided above and below the refrigerator compartment is performed by the independent refrigeration compartment refrigeration cycle and the storage compartment refrigeration cycle. Therefore, in particular, the refrigerant evaporation temperature in the refrigerating cycle for the storage room can be increased, and the COP of the refrigerating cycle can be increased. in this case,
Although the COP of the refrigerating cycle for the freezing room cannot be increased, it is possible to improve the operating efficiency of the entire refrigerator including the refrigerating cycle for the storage room and the refrigerating cycle for the freezing room so that power saving can be achieved. Become.

Further, since the respective evaporators of the refrigerating cycle for the freezing room and the refrigerating cycle for the storage room are arranged in the deep part of the freezing room so as to be adjacent to each other on the left and right sides,
Even if the lateral dimension of each evaporator is set small, the dead spaces generated on the left and right of them are naturally reduced, and accordingly, the dimension in the height direction of each evaporator can be set relatively large. In this case, the airflow generated by the freezer compartment fan and the storage compartment fan corresponding to each evaporator is configured to flow vertically while contacting each evaporator,
The time for heat exchange between the airflow and each evaporator becomes long. Further, as a result of the reduction in the lateral dimension of each evaporator in this way, the air circulation amount in these evaporators becomes uniform in the central portion and the peripheral portion.
Therefore, unlike the conventional configuration shown in FIG. 5, the heat exchange efficiency is not lowered, and the power saving effect can be sufficiently exerted.

Moreover, as described above, since both the evaporator for the freezing compartment and the evaporator for the storage compartment are arranged in the deep part of the freezing compartment, the heat insulation wall of the storage compartment has a large thickness dimension as in the conventional structure. Therefore, it is possible to improve the volumetric efficiency of the refrigerator body as a result. Further, since the heat insulating partition member for partitioning between the evaporator for the freezer compartment and the evaporator for the store room also serves as an air duct for guiding the cool air in the upper store room to the lower store room, from this aspect as well. The volumetric efficiency of the refrigerator body can be improved.

In the refrigerator according to the second aspect, since the defrosting of the evaporator for the storage room is periodically performed by the off-cycle natural defrosting method, the power for the defrosting is forced by the evaporator for the freezing room. It is only required for defrosting, and it is less necessary than the conventional configuration that requires forced defrosting of a relatively large evaporator for cooling the freezer compartment and the storage compartment. Power saving can be promoted. Moreover, since off-cycle natural defrosting is performed every time the operation of the storage room evaporator is stopped, the amount of frost formation is relatively small, and as a result, the radiation fin pitch of the storage room evaporator is set small. As a result, the volumetric efficiency can be improved, and the miniaturization can be realized.

In the refrigerator according to the third aspect, as the dew-proof pipe for the freezer compartment, a dew-proof pipe utilizing heat-radiating pipes that generate heat during operation of the refrigerating cycle for the freezer compartment is provided. Since the dew proofing function of the pipe can be reliably obtained, and the dew proof pipe for the storage room is provided with a heat radiating pipe that generates heat during operation of the refrigerating cycle for the storage room. The dew-proof function of the dew-proof pipe can be reliably obtained.

In the refrigerator according to the fourth aspect, the defrost water in the evaporation tray (the defrost water from the evaporator for the freezer and the evaporator for the store) is generated by the heat from the heat radiation pipe in the freezer cycle for the store. Which is evaporated, but generally
Since the operating time of the refrigerating cycle for the storage room is longer than the operating time of the refrigerating cycle for the freezing room, sufficient heat can be given to the evaporating dish to ensure that the defrosted water inside it is To be able to evaporate.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. FIG. 1 shows a schematic configuration of a refrigerator in a state where a main part is seen through. In FIG. 1, the refrigerator main body 11 has a freezing compartment 12 (which is actually divided into, for example, two compartments, upper and lower, but is omitted here) in the center thereof, and the refrigerator compartment 11 is A refrigerating room 13 and a vegetable room 14 as storage rooms having a set temperature higher than that of the freezing room 12 are arranged above and below the freezing room 12. A partition cover 15 is provided at the back of the freezer compartment 12.
A freezer compartment duct 15 defined by a and a refrigerating compartment duct 16 defined by a heat insulating cover 16a are provided in a state of being adjacent to each other on the left and right.
The space between 6 is partitioned by a heat insulating partition member 17.

An air duct 17a extending vertically is formed inside the heat insulating partition member 17, and the air duct 17a is arranged so as to guide cold air in the refrigerating compartment 13 into the vegetable compartment 14 as described later. ing.

Inside the freezer compartment duct 15, a freezer compartment evaporator (hereinafter abbreviated as F evaporator) 18 included in a freezer compartment refrigeration cycle, which will be described later, is arranged, and inside the refrigerating compartment duct 16. Is a refrigerator evaporator (hereinafter abbreviated as R evaporator) 19 as a storage chamber evaporator included in the storage chamber refrigeration cycle described later, whereby the F evaporator 18 and the R evaporator 19 are:
The freezer compartment 2 is provided in a state of being laterally adjacent to each other and separated from each other by a heat insulating partition member 17.

F evaporator 18 in freezer compartment duct 15
A freezer compartment fan 20 is disposed above the above-mentioned position, and in the state in which the fan 20 is operated, an air circulation path as described below is formed. That is, the duct 15 for the freezer compartment → the outlet 15 formed in the partition cover 15a.
b → freezing room 12 → suction port 12a formed at the bottom of the freezing room 12 → freezing room air duct (not shown) formed on the partition wall 21 between the freezing room 12 and the vegetable room 14 → the freezing room duct 15 A flowing air flow path is formed, and accordingly, an air flow that flows upward while being in contact with the F-eva 18 is generated.

The upper part of the refrigerating compartment duct 16 is communicated with an auxiliary duct 16b located at the back of the refrigerating compartment 13, and a refrigerating compartment fan 22 as a storage room fan is provided in the auxiliary duct 16b. It is arranged. In the state where the refrigerating compartment fan 22 is operated, an air circulation path as described below is formed. That is, the refrigerator compartment duct 16
→ Blowout port 16c formed in the auxiliary duct 16b → Refrigerating chamber 13 → Suction port 13a formed at the bottom of the refrigerating chamber 13 → Air duct (not shown) formed in the partition wall 23 between the freezing chamber 12 and the refrigerating chamber 13 → In the path of the air duct 17a in the heat insulating partition member 17 → the vegetable compartment 14 → the suction port 14a formed in the ceiling of the vegetable compartment 14 → the air duct for the vegetable compartment (not shown) formed in the partition wall 21 → the duct 16 for the refrigerating compartment A flowing air flow path is formed, and accordingly, an air flow that flows upward while being in contact with the R-eva 19 is generated.

FIG. 2 schematically shows a piping configuration of the refrigerating compartment refrigeration cycle A including the F evaporator 8. This Figure 2
In the above, the compressed vaporized refrigerant discharged from the refrigerating operation compressor 24 passes through the condenser 25 and the dew-prevention pipe 26, which constitute the heat radiation pipe, respectively, and then the dryer 2
7. After being liquefied through the capillary tube 28, it is supplied to the F evaporator 18, where it is heat-exchanged and evaporated, and then returned to the compressor 24. In the refrigerating cycle A for the freezer compartment, the frost formed on the F evaporator 18 is melted by a forced defrosting method using a heating means (defrosting heater or hot gas from the compressor 24) not shown. There is.

FIG. 3 schematically shows the piping configuration of the storage compartment refrigeration cycle B including the R evaporator 19. In FIG. 3, the compressed vaporized refrigerant discharged from the refrigeration operation compressor 29 passes through an evaporation dish pipe 30, a condenser 31, and a dew-prevention pipe 32, each of which constitutes a heat radiation pipe, and then passes through a dryer 33 and a capillary tube 34. After being liquefied, it is supplied to the R-evaporator 19, where it is heat-exchanged and evaporated, and then returned to the compressor 29. In this storage room refrigeration cycle B, the frost formed on the R evaporator 19 is periodically melted by a so-called off-cycle natural defrosting method.

FIG. 4 shows each refrigeration cycle A as described above.
The piping configurations of B and B are substantially shown. That is, in the refrigeration cycle A for the freezer compartment, the condenser 25 is attached to the inside of the steel plate portion that constitutes the left side surface (the right side surface in FIG. 4) of the refrigerator body 11 in a heat transfer manner, and at the same time, it is protected The dew pipe 26 is attached to the inside of each front surface of the partition walls 21 and 23 (and the front surface of the partition wall between the upper and lower freezing chambers (not shown)) in a heat transfer manner.

In the refrigerating cycle B for the storage room, the evaporating dish pipe 30 is arranged at the bottom of the refrigerator body 11 so as to receive defrost water from the F and R evaporators 18 and 35. The condenser 31 is arranged so as to be in contact with the back surface of the refrigerator, and is attached to the inside of the steel plate portion constituting the right side surface (left side surface in FIG. 4) of the refrigerator body 11 in a heat transfer manner, and the dew proof pipe 32 is provided. It is attached to the inside of the front side peripheral portions of the refrigerator main body 11 (the front side peripheral portions of the refrigerating compartment 13 and the vegetable compartment 14) in a heat transfer manner.

Therefore, according to the configuration of this embodiment described above, the following actions and effects can be obtained. Temperature control of the freezer compartment 12, the refrigerator compartment 13 and the vegetable compartment 1
Since the temperature control of 4 is performed by the freezing compartment refrigeration cycle A and the storage compartment refrigeration cycle B which are independent systems, the refrigerant evaporation temperature in the storage compartment refrigeration cycle B can be particularly increased. , CO of the refrigeration cycle B
P can be increased. In this case, the COP of the refrigerating cycle A for the freezer cannot be increased, but the operating efficiency as a whole of the refrigerator including the refrigerating cycle B for the storage room and the refrigerating cycle A for the refrigerating room can be increased to save power. Can be achieved.

The F-evaporator 18 and the R-evaporator 19 are connected to the freezer compartment 12.
Since they are arranged in the back and left adjacent to the left and right sides, even if the lateral dimensions of the F and R eva 19 are set small, the dead spaces generated on the left and right of them are naturally reduced. As a result, the size of each of the rivs 18 and 19 in the height direction can be set to be relatively large. In this case, the airflows generated by the freezer compartment fan 20 and the refrigerating compartment fan 22 corresponding to the respective evaporators 18 and 19 flow in the upward direction while being in contact with the F evaporator 18 and the R evaporator 19, respectively. Therefore, the time for heat exchange between the air flow and each of the evas 18 and 19 becomes long. Of course, in this way,
As a result of the reduction in the lateral dimension of 9, the air flow rates in the effluents 18 and 19 are made uniform in the central portion and the peripheral portion. Therefore, as in the conventional configuration shown in FIG. The efficiency is not lowered and the power saving effect can be fully exerted.

As described above, the F Eva 18 and the R Eva 19
Since both of them are arranged at the back of the freezer compartment 12, there is no need to increase the thickness dimension of the heat insulation wall of the refrigerating compartment 13 (and the vegetable compartment 14) as in the conventional configuration, and as a result, the refrigerator main body 11 It becomes possible to improve the volumetric efficiency.
In addition, since the heat insulating partition member 17 for partitioning the F-evaporator 18 and the R-evaporator 19 is configured to internally include an air duct 17a for guiding the cool air in the refrigerating compartment 13 to the vegetable compartment 14, this surface Therefore, the volumetric efficiency of the refrigerator main body 11 can be improved.

Since the defrosting of the R-evaporator 19 is performed periodically by the off-cycle natural defrosting method, the power for defrosting is only required during the forced defrosting of the F-evaporator 18. Therefore, it is possible to reduce the number as compared with the conventional configuration in which forced defrosting of a relatively large-sized evaporator for cooling the freezing compartment and the refrigerating compartment is required, and power saving can be promoted also from this aspect. In addition, the R-evaporator 19 has a relatively small amount of frost formation due to the off-cycle natural defrosting performed every time the operation of the R-Eva 19 is stopped. Can be set small to improve the volumetric efficiency, and the miniaturization can be realized.

During operation of the refrigerating cycle A for the freezer compartment, the dew-proof pipe 26 using the heat radiation pipes in the refrigerating cycle A generates heat, so that the dew-proof pipe 26 ensures the dew-proof function. In addition, during operation of the refrigeration cycle B for the storage room, the dew-prevention pipe 32 using the heat-dissipating pipe in the refrigeration cycle B generates heat. The dew-proof function can be surely obtained.

Evaporating dish 35 from F Eva 18 and R Eva 19
The defrosted water flowing into the inside is evaporated by the heat from the evaporation dish pipe 30 constituted by the heat radiation pipe in the storage room refrigeration cycle B, but in general, the storage room refrigeration cycle B Since the operating time of is longer than the operating time of the refrigerating cycle A for the freezer compartment, sufficient heat can be given to the evaporating dish 35, and the defrosting water inside can be surely evaporated. .

[0037]

As is clear from the above description, according to the refrigerator of the first aspect, the freezer compartment is arranged in the central portion and the storage compartments having the set temperature higher than that of the freezer compartment are provided above and below the freezer compartment. In a refrigerator provided with a refrigerator body arranged, a freezer evaporator and a storage room evaporator, which are included in the independent refrigerating cycle refrigerating cycle and the storing room refrigerating cycle, are adjacent to the inner side of the freezing room. In addition to the above, the heat insulating partition member, which is configured as an air duct for guiding the cool air in the upper storage chamber to the lower storage chamber, is arranged between the evaporator for the freezer compartment and the evaporator for the storage compartment. ,
This has the beneficial effect that the power saving effect due to the provision of the two refrigeration cycles can be sufficiently exerted and the volumetric efficiency of the refrigerator main body can be improved.

According to the refrigerator of the second aspect, since the electric power is required only for defrosting the evaporator for the freezer compartment, the electric power required for defrosting can be reduced.

According to the refrigerator of claim 3, the dew-proof pipe for the freezing compartment is constructed by utilizing the heat radiation pipe in the refrigerating cycle for the freezing compartment, and the dew-proof pipe for the storage compartment is frozen for the storage compartment. Since the heat radiation pipes in the cycle are used for the configuration, the dew-preventing function of the dew-preventing pipes can be surely exhibited.

According to the fourth aspect of the refrigerator, the heat dissipation pipe in the refrigeration cycle for the storage room is used as the heat source of the evaporation tray for receiving defrosting water from the evaporator for the freezing room and the evaporator for the storage room. As a result, sufficient heat is applied to the evaporation dish, and the defrosted water inside the evaporation dish is surely evaporated.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a refrigerator in a transparent state according to an embodiment of the present invention.

FIG. 2 Piping diagram of refrigeration cycle part 1

[Fig. 3] Piping diagram of refrigeration cycle 2

FIG. 4 is a perspective view showing the piping of the refrigeration cycle in substance.

FIG. 5 is a front view of a refrigerator body showing a conventional example.

[Explanation of symbols]

In the drawings, 11 is a refrigerator main body, 12 is a freezing room, 13 is a refrigerating room (storage room), 14 is a vegetable room (storage room), 15 is a freezing room duct, 15a is a partition cover, 16 is a refrigerating room duct, 16a is a heat insulating cover, 17 is a heat insulating partition member, 17a
Is an air duct, 18 is an evaporator for a freezer, 19 is an evaporator for a cold room, 20 is a fan for a freezer, 22 is a fan for a cold room (fan for a storage room), 24 is a compressor for freezing operation, and 26 is a dew-proof pipe ( (Radiation pipe), 29 is a compressor for refrigerating operation, 30 is an evaporation dish pipe (radiation pipe), 32 is a dew-proof pipe (radiation pipe), 35 is an evaporation dish, A is a freezer compartment refrigeration cycle, and B is storage. A room refrigeration cycle is shown.

Claims (4)

[Claims] 1. A refrigerator main body comprising a freezing compartment arranged in a central portion and storage compartments having a set temperature higher than that of the freezing compartment arranged above and below the freezing compartment, and temperature control of the freezing compartment and each storage compartment. In a refrigerator configured to perform a refrigerating cycle refrigerating cycle and a refrigerating chamber refrigerating cycle having independent systems, a refrigerating compartment evaporator included in the refrigerating compartment refrigerating cycle and a storage compartment evaporator included in the refrigerating compartment freezing cycle. Is arranged adjacent to the inner side of the freezer compartment on the left and right, and cool air from each evaporator is generated by generating an air flow that flows vertically while being in contact with the evaporator for the freezer compartment and the evaporator for the storage compartment. And a fan for the freezing room and a fan for the storage room, which are respectively supplied to the upper storage room and the upper storage room, are arranged corresponding to the above evaporators. In addition, a heat insulating partition member disposed between the evaporator for the freezing compartment and the evaporator for the storage compartment, the inside being configured as an air duct for guiding the cool air in the upper storage compartment to the lower storage compartment, Refrigerator to do. 2. The freezing chamber evaporator is defrosted by a forced defrosting method by a heating means, and the storage chamber evaporator is defrosted by an off-cycle natural defrosting method. Refrigerator according to 1. 3. A dew-proof pipe for a freezer compartment is constructed by using a heat-dissipating pipe in a freezer-cycle refrigeration cycle, and a dew-proof pipe for a storage room is used for heat-dissipation in a refrigerating cycle for a store room. The refrigerator according to claim 1, wherein the refrigerator is configured by using piping. 4. An evaporator for a freezer compartment and an evaporation dish for receiving defrosting water from the evaporator for a store room, and as a heat source for evaporating the defrosting water in the evaporator tray, for radiating heat in the refrigeration cycle for the storage room. The refrigerator according to claim 1, wherein the refrigerator uses a pipe.