JPH10153371A - Freezer refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breaker of home electric wiring from tripping by driving one of freezer compressor or refrigerator compressor with a DC power supply and the other with a commercial power supply thereby preventing an undue overcurrent from flowing through a freezer refrigerator at the time of simultaneous start. SOLUTION: A compressor 3 being driven with a DC power supply is employed for a freezer and a compressor 4 being driven with a commercial power supply, is employed for a refrigerator. A current about ten times as high as steady current flows into the compressor 4 for refrigerator at the time of starting but the compressor 3 for freezer can be started without requiring an undue overcurrent. Consequently, even when two compressors 3, 4 are started simultaneously, starting current for the freezer refrigerator is substantially equal to the starting current of the compressor being driven with the commercial power supply. Since an undue overcurrent does not flow through the freezer refrigerator at the time of starting, possibility of tripping the breaker of home electric wiring can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having two refrigeration cycles.

[0002]

2. Description of the Related Art In recent years, refrigerators are provided with two refrigerating cycles having different evaporation temperature settings for a freezing room and a refrigerating room in order to improve the operating efficiency of the refrigerating cycle and to save power. It has been proposed.

[0003] Conventionally, a refrigerator having two refrigerating cycles is disclosed in Japanese Patent Application Laid-Open No. 7-71857.

Hereinafter, the above-mentioned conventional refrigerator-freezer will be described with reference to the drawings. FIG. 8 is a refrigeration cycle diagram for a freezer compartment of a conventional refrigerator-freezer, and FIG. 9 is a refrigeration cycle diagram for a refrigerator compartment of the same conventional refrigerator-freezer. 8, 1 is a freezing room, 28 is a freezing room compressor 25, a freezing room condenser 5,
The refrigeration cycle for freezer compartments comprising the decompressor 7 for freezer compartment, the cooler 9 for freezer compartment, and the forced air circulation fan 26 for freezer compartment is shown. In FIG. 9, reference numeral 2 denotes a refrigeration room, 29 denotes a refrigeration room compressor 4, a refrigeration room condenser 6, a refrigeration room depressurizer 8, a refrigeration room cooler 10, and a refrigeration room cold air forced circulation fan 27. The refrigeration cycle for the refrigerator compartment configured is shown. Further, 21 is a freezing room temperature detecting means, and 23 is a freezing room temperature detecting means 21.
A control circuit for the freezer compartment, which controls the operation of the compressor 25 for the freezer compartment and the forced air circulation fan 26 for the freezer compartment based on the input from the control unit 22; The control circuit for the refrigerator compartment controls the operation of the compressor 4 for the refrigerator compartment and the forced air circulation fan 27 for the refrigerator compartment by an input.

The operation of the refrigerator having the above-described structure will be described. If the temperature of the freezer compartment 1 detected by the freezer compartment temperature detecting means 21 is higher than the set temperature, the freezer compartment control circuit 23 switches the commercial power supply to the freezer compartment compressor 2.
The cool air cooled by the freezer cooler 9 is supplied into the freezer 1 by being supplied to the freezer 5 and the cool air forced circulation fan 26 for the freezer, thereby operating the both, thereby cooling the freezer 1.
Next, when the temperature of the freezing room 1 detected by the freezing room temperature detecting means 21 becomes lower than the set temperature, the operation of the freezing room compressor 25 is stopped by the freezing room control circuit 23 and the free air of the freezing room is forcedly circulated. The operation of the fan 26 is also stopped, and the freezing compartment 1 is not cooled. By repeating the above operation, the freezing room 1 is maintained at a predetermined temperature. If the temperature of the refrigerator compartment 2 detected by the refrigerator compartment temperature detecting means 22 is higher than the set temperature, the commercial power is supplied to the refrigerator compressor 4 and the cold air forced circulation fan 27 by the refrigerator control circuit 24. When both are operated, the refrigerator cooler 1
0 is supplied to the refrigeration room 2 and the refrigeration room 2
Is cooled. Next, when the temperature of the refrigerator compartment 2 detected by the refrigerator compartment temperature detecting means 22 becomes lower than the set temperature, the operation of the refrigerator compartment compressor 4 is stopped by the refrigerator compartment control circuit 24, and the cold air for the refrigerator compartment is forcedly circulated. The operation of the fan 27 is also stopped, and the refrigerator compartment 2 is not cooled. By repeating the above operation, the refrigerator compartment 2 is maintained at a predetermined temperature.

At this time, it is generally known that the operating temperature of the refrigeration cycle can be increased by increasing the evaporation temperature of the refrigerant as much as possible. By setting to, the operating efficiency of the entire refrigeration cycle is increased.

[0007]

However, in the above configuration, the compressor 25 for the freezer compartment and the compressor 4 for the refrigerator compartment are driven by the commercial power supply, so that at startup, the startup is less than 10 times that of the normal operation. Electric current flows. For example, in the case of a general home refrigerator, the current value during normal operation is 1-2.
In contrast to [A], when starting, it becomes 10 to 15 [A], and when the two compressors 25 and 4 start simultaneously, an excessive starting current of 20 [A] or more flows in the refrigerator. . At this time, there is a drawback that a breaker of an electric wiring may fall in a general home.

[0008] The present invention solves the problems of the prior art.
It is an object of the present invention to provide a refrigerator which does not cause an excessive startup current to flow through the refrigerator even when two compressors are started at the same time, thereby reducing the possibility of a breaker of the electric wiring in the house from falling.

Further, in the above-mentioned conventional configuration, the cool air forced circulation fan 26 for the freezer compartment and the cold air forced circulation fan 27 for the refrigerator compartment are provided.
May be operated at the same time. At this time, since the two fans are driven by the same commercial power supply, the rotation frequency becomes the same, and there is a drawback that a growling sound is generated.

Another object of the present invention is to provide a refrigerator having a quiet sound by preventing the generation of humming noise even when the two fans are operated simultaneously.

Further, in the above-described conventional configuration, there is a disadvantage that the condenser 5 for the freezer compartment and the condenser 6 for the refrigerator have a natural radiation, so that the radiation efficiency is poor.

Another object of the present invention is to provide a refrigerating refrigerator having a low noise and a high refrigerating cycle efficiency by increasing the heat radiation efficiency of the two condensers.

[0013]

SUMMARY OF THE INVENTION To achieve this object, the present invention provides a method in which one of the compressors of two independent refrigeration cycles is driven by a DC power supply and an excessively large amount of power is generated at startup. The current stopped flowing. Thereby, it is possible to prevent an excessive starting current from flowing to the refrigerator when the two compressors are simultaneously started.

[0014] Of the compressors of the two independent refrigeration cycles, the compressor for the freezer compartment, which generally has a larger starting current when the commercial power supply is started, is driven by a DC power supply so that an excessive current does not flow at the time of starting. When the two compressors are started at the same time, an excessive starting current can be prevented from flowing to the refrigerator-freezer.

A voltage applied to the two forced air circulation fans by using a fan driven by a DC power supply and having the same rotation speed at the rated voltage as the cold air forced circulation fan for the freezer compartment and the cold air forced circulation fan for the refrigerator compartment. Was different. Thereby, the rotation speeds of the two fans can be shifted.

In addition, the condenser cooling fan for the freezer compartment is provided in the refrigerating cycle for the freezer compartment, the condenser cooling fan for the refrigerating compartment is provided in the refrigerating cycle for the refrigerating compartment, and has the same rotation speed at the rated voltage driven by the DC power supply. A fan is used as the condenser cooling fan for the freezer compartment and the cold air forced circulation fan for the refrigerator compartment, so that the voltages applied to the two condenser cooling fans are different. Thus, by forcibly flowing air through the two condensers, the heat transfer coefficient on the condenser air side is improved, the radiation efficiency is increased, and the rotation speed of the two condenser cooling fans used for that purpose is reduced. Can be shifted.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a freezer compartment, a freezer compartment compressor, a freezer compartment condenser, a freezer compartment decompressor, and a freezer compartment which independently control the temperature of each compartment. A refrigerator, a refrigerating cycle refrigeration cycle including a freezer forced air circulation fan, and a refrigerating compartment compressor, a refrigerating compartment condenser,
Two independent refrigeration cycles are provided: a refrigerator decompressor, a refrigerator compartment cooler, and a refrigerator compartment refrigeration cycle consisting of a cold air forced circulation fan, wherein the refrigerator compartment compressor and the refrigerator compartment compressor are provided. , One of which is driven by a DC power supply and the other is driven by a commercial power supply.

As a result, since one of the compressors of the two independent refrigeration cycles is driven by a DC power supply, an excessive current does not flow at the time of startup.
When the two compressors are started at the same time, an excessive starting current does not flow through the refrigerator.

In addition, since a compressor driven by a DC power supply is used for a freezing room compressor and a compressor driven by a commercial power supply is used for a refrigerator compartment compressor, the starting current of the commercial power supply generally increases. By driving a large freezing room compressor with a DC power supply to prevent excessive current from flowing at startup,
When the two compressors are started at the same time, excessive starting current does not flow to the refrigerator again.

A voltage applied to the two forced air circulating fans by using a fan driven by a DC power supply and having the same rotation speed at the rated voltage as the cold air forced circulation fan for the freezing room and the cold air forced circulation fan for the cold room. By providing the freezer forced air circulation fan control circuit and the refrigerating room forced air forced circulation fan control circuit independently, the rotation speeds of the two fans can be shifted.
Even if the two fans are operated at the same time, generation of a growling sound is prevented.

The condenser cooling fan for the freezer compartment is provided in the refrigerating cycle for the freezer compartment, and the condenser cooling fan for the refrigerating compartment is provided in the refrigerating cycle for the refrigerating compartment. A freezing room condenser cooling fan control circuit and a refrigeration unit, wherein a fan is used as the freezing room condenser cooling fan and the refrigerator room condenser cooling fan so that the voltages applied to the two condenser cooling fans are different. By independently providing the room condenser cooling fan control circuits, the air-side heat transfer coefficient of the two condensers is improved, and the heat radiation efficiency is increased.
The number of rotations of the two condenser cooling fans can be shifted, and the generation of a growling noise can be prevented even when the fans are operated simultaneously.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigerator according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a refrigeration cycle diagram for a freezer compartment of a refrigerator according to a first embodiment of the present invention, and FIG. 2 is a refrigeration cycle diagram for a refrigerator compartment of the refrigerator according to the first embodiment. FIG. 3 is a characteristic diagram showing a change in current flowing through the refrigerator before and after starting the compressor of the embodiment.

1 and 2, reference numeral 3 denotes a refrigerator compressor driven by a DC power supply, and reference numeral 4 denotes a refrigerator compressor driven by a commercial power supply.

The operation of the refrigerator-freezer constructed as described above will be described below with reference to the current change characteristic diagram of FIG.

Since the refrigerating compartment compressor 4 is driven by a commercial power source, a starting current that is slightly less than ten times that of a normal operation flows at the time of startup, while the refrigerating compartment compressor 3 is driven by a DC power source. , It can be started without the need for excessive starting current. For example, a starting current A1 of a compressor driven by a commercial power supply is 10 to 15 [A], whereas a starting current A1 of a compressor driven by a DC power supply is 1 [A].
The following starting current A2 is sufficient. As a result, even if the two compressors 3 and 4 are started simultaneously, the starting current A3 of the refrigerator-freezer is almost the same as the starting current A1 of the compressor driven by one commercial power supply. Will not flow.

At this time, since the compressor driven by the DC power supply is used for the refrigerator 3 and the compressor driven by the commercial power supply is used for the refrigerator 4, the refrigerating capacity is generally reduced. In the case of a commercial power supply, the starting current of the compressor 3 is large. Therefore, the compressor 3 for a freezer compartment is driven by a DC power supply, so that an excessive current does not flow at the time of starting. For this reason, when the two compressors 3 and 4 are started at the same time, an excessive starting current does not flow to the refrigerator again.

As described above, the refrigerator-freezer of this embodiment comprises a freezer compartment 1, a refrigerator compartment 2 and a freezer compartment compressor 3 for independently controlling the temperature of each compartment, a freezer compartment condenser 5, Room decompressor 7, freezer room cooler 9, freezer room refrigeration cycle 13 composed of freezer forced air circulation fan 26, and refrigerator compartment compressor 4, refrigerator compartment condenser 6, refrigerator compartment decompression Two independent refrigeration cycles of a refrigerator compartment refrigeration cycle 14 including a refrigerator 8, a refrigerator compartment refrigerator 10, and a refrigerator cold air forced circulation fan 27 are provided, and the refrigerator compartment compressor 3 and the refrigerator compartment compressor 4 are provided. Of these, one is driven by a DC power supply and the other is driven by a commercial power supply, so that even if the two compressors 3 and 4 start simultaneously, an excessive start-up current does not flow in the refrigerator-freezer. Breaker of electrical wiring inside may fall It is reduced.

The compressor driven by the DC power supply is used for the refrigerator 3 and the compressor driven by the commercial power supply is used for the refrigerator 4, so that the two compressors 3 and Even if 4 starts at the same time, excessive starting current will not flow to the refrigerator again, and the possibility that the breaker of the electric wiring in the house will fall is reduced.

Further, since it is difficult for an excessive starting current to flow through the refrigerator, the reliability and durability of compressor-related electric components of the refrigerator can be improved.

(Embodiment 2) FIG. 4 is a refrigeration cycle diagram for a refrigerator of a refrigerator according to a second embodiment of the present invention, and FIG. 5 is a refrigeration cycle diagram for a refrigerator of the refrigerator according to the second embodiment.

4 and 5, reference numeral 11 denotes a forced-air cooling fan for a freezer compartment driven by a DC power supply.
Reference numeral 2 denotes a cool air forced circulation fan for a refrigerator, which uses a fan having a rated voltage and the same rotation speed. Reference numeral 15 denotes a cool air forced circulation fan control circuit for the freezer compartment, and reference numeral 16 denotes a cold air forced circulation fan control circuit for the refrigerator compartment, each having a different voltage V1, V2.
2 is applied to the two cool air forced circulation fans 11 and 12.

The operation of the refrigerator having the above-described structure will be described below. The cold air forced circulation fan 11 for the freezing room and the cold air forced circulation fan 12 for the cold room are controlled by the operation of the compressor 3 for the freezing room and the compressor 4 for the cold room, respectively. Circuit 15 and cold air forced circulation fan control circuit 1 for refrigerator compartment
6, different voltages are applied and the operation is performed. In general, the number of rotations of a fan driven by a DC power supply changes in a substantially proportional relationship depending on the supplied voltage. Therefore, the two fans 11 and 12 have different rotation speeds even though the fans have the same rotation speed at the rated voltage. Therefore, it is possible to prevent generation of a growling sound due to driving at the same rotation speed. For example, 1800 [r.
p. m. When 10 [V] is applied to the rotating fan, the number of rotation is increased to 1600 [r. p. m. ] To 8 [V], the number of rotations is increased to 1400 [r. p. m. ] Can be reduced. On the other hand, it is known that generation of a growling sound can be prevented by shifting the rotation frequency by 5 Hz or more in the case of a fan. If this is applied to the fan of this embodiment, the rotation speed of one fan is set to 1800 [r. p. m. ], 3 fans
The rotation frequency is as follows, assuming a multi-blade fan with a single blade and a slip of 0.5.

1800 [r. p. m. ] × 0.5 × 3
(Sheets) / 60 = 45 [Hz] At this time, to prevent humming, 45 [Hz] to 5 [H]
z] or more, and the rotational speed in this case is calculated back as follows.

40 [Hz] × 60 / (0.5 × 3
(Sheets)) = 1600 [r. p. m. Therefore, in the case of the fans, it is possible to prevent the generation of growling noise by changing the voltage supplied to each fan by 2 [V].

As described above, the refrigerator-freezer of the present embodiment uses the fans having the same rotation speed at the rated voltage driven by the DC power supply for the freezing room forced air circulation fan 11 and the refrigerating room forced air forced circulation fan 12. By providing the freezing room forced air circulation fan control circuit 15 and the refrigerating room forced air forced circulation fan control circuit 16 in which the voltages applied to the two cold air forced circulation fans 11 and 12 are different from each other, The number of rotations of the two fans 11, 12 can be shifted, and even if the two fans 11, 12 are operated at the same time, the generation of humming noise can be prevented, and a quiet refrigerator can be provided.

Further, a fan having a rated voltage and the same number of rotations can be used for the cold air forced circulation fan 11 for the freezing room and the cold air forced circulation fan 12 for the cold room, so that the parts to be used can be shared and the refrigerator / freezer having good assemblability can be obtained. Can be provided.

(Embodiment 3) FIG. 6 is a refrigeration cycle diagram for a freezer compartment of a refrigerator-freezer according to a third embodiment of the present invention, and FIG. 7 is a refrigeration cycle diagram for a refrigerator compartment of the refrigerator-freezer according to the third embodiment.

6 and 7, reference numeral 17 denotes a freezing room condenser cooling fan driven by a DC power source provided in the freezing room refrigeration cycle 13, and reference numeral 18 denotes a refrigeration provided in the freezing room refrigeration cycle 14. Room condenser cooling fans, each of which has the same rotation speed at the rated voltage. 19 is a condenser cooling fan control circuit for the freezer compartment,
Is a condenser cooling fan control circuit for the refrigerator compartment, which applies different voltages V3 and V4 to the two condenser cooling fans 17 respectively.
And 18.

The operation of the refrigerator having the above-described structure will be described below. The condenser cooling fan 17 for the freezer compartment and the condenser cooling fan 18 for the refrigerator compartment control the cooling fan for the freezer compartment in conjunction with the operation of the compressor 3 for the freezer compartment and the compressor 4 for the refrigerator compartment, respectively. Circuit 19,
Further, the operation is performed by applying different voltages from the refrigerator cooling fan control circuit 20 for the refrigerator. The operation of the freezing room condenser cooling fan 17 and the freezing room condenser cooling fan 18 causes the freezing room condenser 5 and
The heat radiation efficiency of the refrigerator compartment condenser 6 rises, and the efficiency of the refrigeration cycle increases. At this time, the two fans 17 and 18
Is different from the voltage supplied to
The rotation speeds of the two fans 17 and 18 can be shifted, thereby preventing generation of a growling noise and providing a quiet refrigerator.

As described above, in the refrigerator-freezer of this embodiment, the cooling fan 17 for the freezer compartment is connected to the refrigerating cycle 1 for the freezer compartment.
3, a refrigerator cooling fan 18 for the refrigerator compartment is provided in the refrigerator cycle 14 for the refrigerator compartment, and a fan of the same rotation speed at the rated voltage driven by the DC power supply is connected to the condenser cooling fan 13 for the refrigerator compartment and the refrigerator cooling fan 13. Cold air forced circulation fan 14
, A freezing compartment condenser cooling fan control circuit 19 and a refrigerator compartment condenser cooling fan control circuit 20 having different voltages applied to the two condenser cooling fans are provided independently of each other. In addition, the radiation efficiency of the two condensers 5 and 6 is increased, and an efficient refrigerating refrigerator of a refrigerating cycle is provided, and the rotation speeds of the two condenser cooling fans 17 and 18 used for that purpose can be shifted. Even if the fans operate at the same time, the generation of humming noise is prevented, and a refrigerator with a quiet sound can be provided.

Further, a fan having the same rotation speed at the rated voltage can be used for the cooling fan 17 for the freezing room and the cooling fan 18 for the freezing room, so that the used parts can be shared and the assembling property is good. Freezer refrigerator can be provided.

[0043]

As described above, according to the present invention, one of the compressors for the freezer compartment and the compressor for the refrigerator compartment of the two independent refrigeration cycles is driven by a DC power supply and the other is driven by a commercial power supply. By doing so, even if the two compressors start up at the same time, an excessive start-up current does not flow to the refrigerator-freezer, and further, the compressor driven by the DC power supply is used as a freezer compartment compressor. By using a compressor driven by a commercial power supply for the refrigerator compartment compressor, an excessive start-up current does not flow to the refrigerator even if the two compressors are started at the same time. Breakers are less likely to fall.

Further, since it is difficult for an excessive starting current to flow through the refrigerator, the reliability and durability of compressor-related electrical components of the refrigerator can be improved.

Further, a fan to be applied to the two cold air forced circulation fans by using a fan driven by a DC power supply and having the same rotation speed at the rated voltage as the cold air forced circulation fan for the freezer compartment and the cold air forced circulation fan for the refrigerator compartment. The independent provision of the cool air forced circulation fan control circuit for the freezer compartment and the cold air forced circulation fan control circuit for the refrigerator compartment which are different from each other prevents generation of a growling sound even when the two fans are operated simultaneously. And a refrigerator with a quiet sound can be provided.

Further, by using a fan having a rated voltage and the same number of revolutions as the cold air forced circulation fan for the freezer compartment and the cold air forced circulation fan for the refrigerator compartment, the components to be used can be shared, and a refrigerating refrigerator with good assemblability can be provided. .

The condenser cooling fan for the freezer compartment is provided in the refrigerating cycle for the freezer compartment, the condenser cooling fan for the refrigerating compartment is provided in the refrigerating cycle for the refrigerating compartment, and has the same rotation speed at the rated voltage driven by the DC power supply. A refrigerator cooling fan control circuit and a refrigeration unit, wherein a fan is used for the freezing room condenser cooling fan and the cold room forced air circulating fan so that the voltages applied to the two condenser cooling fans are different. Since the room condenser cooling fan control circuits are provided independently of each other, the heat dissipation efficiency of the two condensers is increased, and an efficient refrigerator having a refrigeration cycle is provided, and the two condensers used for that purpose are provided. The number of rotations of the cooling fan can be shifted, and even if the fans are operated at the same time, the generation of humming noise is prevented, and a refrigerator with a quiet sound can be provided.

Further, a fan having a rated voltage and the same number of revolutions can be used for the condenser cooling fan for the freezer compartment and the condenser cooling fan for the refrigerator compartment. Can be provided.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram for a freezer compartment of Embodiment 1 of a refrigerator-freezer according to the present invention.

FIG. 2 is a refrigeration cycle diagram for a refrigerator in a refrigerator according to a first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a change in current flowing in a refrigerator before and after starting the compressor of the embodiment.

FIG. 4 is a refrigeration cycle diagram for a refrigerator in a refrigerator according to a second embodiment of the present invention.

FIG. 5 is a refrigeration cycle diagram for a refrigerator in a refrigerator-freezer according to a second embodiment of the present invention.

FIG. 6 is a refrigeration cycle diagram for a freezer compartment of a refrigerator according to a third embodiment of the present invention.

FIG. 7 is a refrigeration cycle diagram for a refrigerator in a refrigerator according to a third embodiment of the present invention.

FIG. 8 is a refrigeration cycle diagram for a freezer of a conventional refrigerator-freezer.

FIG. 9 is a refrigeration cycle diagram for a refrigerator in a conventional refrigerator-freezer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Freezer room 2 Refrigerator room 3 Refrigerator compressor 4 Refrigerator compressor 5 Refrigerator cooler 6 Refrigerator cooler 7 Freezer cooler 8 Refrigerator cooler 9 Freezer cooler 10 Refrigerator Room cooler 11 Freezer forced air circulation fan 12 Freezer forced air circulation fan 13 Freezer freezing cycle 14 Cold room freezer cycle 15 Freezer forced air circulation fan control circuit 16 Cold room forced air forced circulation fan Control Circuit 17 Condenser Cooling Fan for Freezer Room 18 Condenser Cooling Fan for Cold Room 19 Condenser Cooling Fan Control Circuit for Freezer Room 20 Condenser Cooling Fan Control Circuit for Cold Room

Claims (4)

[Claims] 1. A freezer compartment, a freezer compartment, and a freezer compartment compressor, a freezer compartment condenser, a freezer compartment decompressor, a freezer compartment cooler, and a freezer compartment that independently control the temperature of each compartment. A refrigeration cycle for a freezer including a forced air circulation fan, and
Providing two independent refrigerating cycles, a refrigerating room refrigerating cycle comprising a refrigerating room compressor, a refrigerating room condenser, a refrigerating room decompressor, a refrigerating room cooler, and a refrigerating room forced air circulating fan; A refrigerator-freezer characterized in that one of a room compressor and a refrigerator compartment compressor is driven by a DC power supply and the other is driven by a commercial power supply. 2. The refrigerator according to claim 1, wherein a compressor driven by a DC power supply is used as a compressor for a freezer compartment, and a compressor driven by a commercial power supply is used as a compressor for a refrigerator compartment. . 3. A voltage applied to the two forced air circulation fans by using a fan driven by a DC power supply and having the same rotation speed at a rated voltage for the freezer forced air circulation fan and the refrigerating room forced air forced circulation fan. The refrigerator-freezer according to claim 1, wherein a cold air forced circulation fan control circuit for the freezer compartment and a cold air forced circulation fan control circuit for the refrigerator compartment are provided independently of each other. 4. A freezing room condenser cooling fan is provided in a freezing room refrigeration cycle, a refrigerator room condenser cooling fan is provided in a refrigerator room refrigeration cycle, and the same fan driven by a DC power supply is provided in the freezing room. Condenser cooling fan control circuit and refrigerator cooling circuit, wherein different voltages are applied to the two condenser cooling fans using the condenser cooling fan and the cold air forced circulation fan for the refrigerator. 2. The refrigerator according to claim 1, wherein the fan control circuits are independently provided.