JPH0989433A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling capacity and to maintain the performance of an evaporator high by providing temperature detecting means in a deep freezing chamber and a cold storage chamber, and providing cold control means for operating a compressor, air outlet switching means and cold air circulating means to switch the freezing chamber and the outlet. SOLUTION: The temperature of a deep freezing chamber 1 is detected by deep freezing chamber temperature detecting means 3, and it is detected that the detected temperature exceeds the previously set predetermined deep freezing chamber temperature and the upper limit of the deep freezing chamber temperature range. Cool control means 16 receives the detected signal, operates the compressor 15 and cold air circulating means 8, air output switching means 26 is so operated as to open a deep freezing chamber air outlet 24 to cool the freezing chamber 1. When it is detected that the temperature of the chamber 1 is lowered and the means 3 detects to exceed the lower limit of the deep freezing chamber temperature range, the means 16 receives the detection signal, stops the compressor 15 and the means 8, the means 26 closes the outlet 24 to stop the cooling. The cold storage chamber 2 is similarly operated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a freezer compartment of a refrigerator,
The present invention relates to cooling technology in a refrigerating room.

[0002]

2. Description of the Related Art A conventional refrigerator is disclosed in, for example, JP-A-7-15.
It is disclosed in Japanese Patent No. 9014, and will be described below with reference to FIG. 7.

The refrigerator is divided into a freezing compartment 51 and a refrigerating compartment 52, and temperature detecting means 53 and 54 are installed inside the freezing compartment 51 and the refrigerating compartment 52.

A freezer compartment door 55 is attached to the front side of the freezer compartment 51, the opening / closing of which is detected by a freezer compartment door switch 56, and an evaporator 57 and an electric fan 58 which is a cold air circulating means are provided at the inner part. A defrosting heater 59 is installed which cools the inside of the freezing chamber 51 by evaporating the refrigerant by the evaporator 57, circulates cool air by the electric fan 58, and removes frost attached to the vicinity of the evaporator 57. A defrost temperature sensor 60 that detects the defrost state is attached.

A refrigerating compartment door 61 is attached to the front of the refrigerating compartment 52, the opening / closing of the refrigerating compartment door 61 is detected by a refrigerating compartment door switch 62, and an electric damper 64 is provided in a cold air passage 63 connecting the freezing compartment 51 and the refrigerating compartment 52. Is installed, the cold air from the freezer compartment 51 is circulated to the refrigerating compartment 52 by the opening / closing operation of the electric damper 64, and in the rear part of the refrigerating compartment 52,
A compressor 65 that constitutes a refrigeration cycle is installed.
The temperature control of the freezer compartment 51 is performed by the control device 66 installed above the inner part.

Next, the operation will be described. Compressor 6
By the operation of 5, the high-temperature and high-pressure refrigerant discharged from the compressor 65 is condensed and liquefied by the condenser, further decompressed by the decompression means, and evaporated and vaporized by the evaporator 57 to cool the air. By operating the electric fan 58, heat is transferred to the freezing chamber 51 and the refrigerating chamber 52, and the refrigerant vaporized in the evaporator 57 is again sucked into the compressor 65 to perform the cooling operation, thereby performing the cooling chamber. 51 and the refrigerator compartment 52 are cooled.

Here, the relationship between the temperature change in the freezer compartment 51 and the cooling operation by the compressor 65 and the electric fan 58 will be described.

The temperature of the freezer compartment 51 fluctuates within a preset predetermined temperature range, and when the temperature of the freezer compartment 51 exceeds the upper limit of the temperature range, the cooling is insufficient, so the control device 66.
Turns on the compressor 65 and the electric fan 58 to start the cooling operation. Further, when the temperature of the freezer compartment 51 becomes lower than the lower limit of the temperature range, supercooling occurs, so the control device 66 causes the compressor 6
5 and the electric fan 58 are turned off to stop the cooling operation. By repeating these operations, the temperature of the freezer compartment 51 is kept within the range.

The refrigerating compartment 52 also fluctuates within a preset predetermined temperature range, and when the temperature of the refrigerating compartment 52 exceeds the upper limit of the temperature range, the cooling is insufficient, so the control device 66 causes the electric damper 64 and the electric fan. 58 is turned on to start the cooling operation, the cool air flows into the refrigerating compartment 52 through the cool air passage 63, and the temperature of the refrigerating compartment 52 is lowered. Further, when the temperature of the refrigerating room 52 becomes lower than the lower limit of the temperature range, it becomes supercooled, so that the control device 66 turns off the electric damper 64 and the electric fan 58 to stop the cooling operation. By repeating these operations, the temperature of the refrigerator compartment 52 is kept within the range.

When the cooling operation is continued in this way, the evaporator 5
Moisture contained in the air circulating through 7 adheres to the surface of the evaporator 57 as frost when heat is exchanged. When the frost formation progresses, the wind speed decreases due to the increase in ventilation resistance, and the air-side heat transfer coefficient of the evaporator 57 decreases due to the frost layer, so that the evaporator 57 is reduced.
The heat exchange performance of is reduced, and sufficient cooling operation becomes impossible.

To prevent this state, defrosting is performed at a predetermined timing, and when defrosting is started, the compressor 65 is stopped and the defrosting heater 59 is operated. Frost on the surface of the evaporator 57 is melted. Evaporator 5
When the frost on the surface of No. 7 is melted, the defrosting temperature sensor 60 indicates that the defrosting is completed at a predetermined temperature (generally 10 to 20).
(° C) or higher, the defrost heater 59 is stopped, and then the normal cooling operation is resumed.

[0012]

However, in the conventional refrigerator as described above, the following two cases can be considered for cooling the refrigerating compartment 52 depending on the temperature condition of the freezing compartment 51. One is when the temperature of the freezer compartment 51 is above the lower limit of the range and the compressor 65 is operating, and the other is when the temperature of the freezer compartment 51 is below the upper limit of the range and the compressor 65 stops. That is the case.

In the former case, the cooled air is cooled by the freezing compartment 51 and the refrigerating compartment 52 depending on the air volume distribution ratio.
Air having a relatively high temperature mixed between the freezing compartment 51 and the refrigerating compartment 52 is sucked into the evaporator 57, so that extra air is added to the cooling of the freezing compartment 51. Since it is necessary to cool, the refrigerating chamber 52 has a small refrigerating effect, and the suction specific volume is also small, so that the refrigerating capacity is low.

In the latter case, the refrigerating chamber 5 is cooled.
Since the refrigerating compartment 52 is cooled by the air of No. 1, the cooling capacity is small, and there is a problem in that the temperature of the freezing compartment 51 rises and the temperature of the refrigerating compartment 51 becomes uneven.

In any case, the cooling of the refrigerating chamber 52 is incidental to the cooling of the freezing chamber 51.
For example, when the heat load of the refrigerating compartment 52 is increased, it is unavoidable that the capacity is insufficient, and when the freezing compartment door 55 is opened, the electric fan 58 is stopped while the compressor 65 is operating. Therefore, there are problems in energy saving such as the electric power of the compressor 65 and the loss of the electric fan 58 in the transitional period of startup.

Further, in the above-mentioned conventional refrigerator, when the cooling operation is continued, frost formation progresses, the wind speed decreases due to the increase in ventilation resistance, and the air-side heat transfer coefficient of the evaporator 57 decreases due to the frost layer. The heat exchange performance of the evaporator 57 deteriorates,
Since sufficient cooling operation becomes impossible, it is necessary to defrost at a predetermined timing.

Although the heat exchange performance of the evaporator 57 is restored by defrosting, since defrosting is normally performed two to three times a day,
Since most of the evaporator 57 is operated in a frosted state, the heat exchange performance of the evaporator 57 is lower than that in the original non-frosted state.

For defrosting, the defrosting heater 59 is used for the evaporator 57.
Since the heating of the defrosting heater 59 causes the temperature of the freezing chamber 51 to rise by heating the defrosting heater 59, an additional cooling operation is required due to the heat reception loss due to the heating of the heater, and there is a problem that the power consumption increases. .

Further, although the defrost heater 59 is usually installed in the lower part of the evaporator 57 having a good defrost efficiency, the cooling chamber is made compact and the volumetric efficiency which is an effective inner volume / outer volume ratio is improved. There was also a problem with.

The present invention solves the conventional problems.
Improves the cooling capacity of the freezer compartment and refrigerating room, makes it highly efficient, enables the heat exchange performance of the evaporator to be maintained at a high level, and reduces power loss when the freezer compartment door is opened. In addition, it is possible to prevent the heat loss of the evaporator due to the defrost heater to prevent the temperature of the freezing room from rising, reduce the power consumption for recooling, and provide a refrigerator with high volume efficiency. Is an issue.

[0021]

In order to solve this problem, a refrigerator according to the present invention is provided with a refrigerating cycle in which a compressor, a condenser, a capillary tube and an evaporator are sequentially connected in an annular shape, and at least one refrigerating chamber is installed. And at least one refrigerating chamber, an evaporator, a cool air circulating means, a freezing chamber blower outlet for sending cold air to the freezer chamber, a refrigerating chamber blower outlet for sending cold air to the refrigerating chamber, and a freezing chamber blower outlet and a refrigerating chamber blower outlet. A cooler chamber having an outlet switching means for switching is provided.

In the freezing compartment, a freezing compartment temperature detecting means,
A refrigerating compartment temperature detecting means is provided in the refrigerating compartment, and the operation of the compressor, the outlet switching means and the cold air circulating means, and the switching between the freezing compartment and the refrigerating compartment outlet are performed by the cooling control means to cool each compartment. Is.

When the compressor is stopped, the freezing chamber outlet is closed and the refrigerating chamber outlet is opened by the outlet switching means by the cooling control means for a predetermined time, and the cold air circulation means is operated to cool the refrigerator. The air in the room can also be heat-exchanged by the evaporator.

Further, at least one freezer compartment door, at least one refrigerating compartment door, freezing compartment door opening / closing detecting means, and refrigerating compartment door opening / closing detecting means are provided, and the freezing compartment door opening / closing detecting means during cooling operation. While detecting the opening of the door, the cooling control means operates so that the outlet switching means closes the freezing compartment outlet and opens the refrigerating compartment outlet, and the refrigerating compartment door opening / closing detection means operates the door. While detecting the opening of the, the cooling control means operates so that the outlet switching means closes the refrigerating compartment outlet and opens the freezer compartment outlet.

Further, a defrost time is provided every predetermined period, the compressor is stopped during the defrost time, the freezer outlet is closed by the outlet switching means, the refrigerator outlet is opened, and the cold air circulation means is provided. The heat is exchanged between the refrigerating room air and the evaporator.

[0026]

With the above-mentioned means, in the refrigerator of the present invention, when the compressor is operated, the high temperature and high pressure refrigerant discharged from the compressor is condensed and liquefied by the condenser and decompressed by the capillary tube. , Evaporate and vaporize in the evaporator to cool the air,
The refrigerant vaporized in the evaporator is again sucked into the compressor, and the cooled air is transferred to at least one freezing compartment and at least one refrigerating compartment by the operation of the cool air circulation means and the outlet switching means. Cooling is performed.

During normal operation, the temperature of the freezer compartment is detected by the freezer compartment temperature detecting means, and the refrigerating compartment temperature is detected by the refrigerating compartment temperature detecting means. When the temperature rises due to the storage of the heat load of food or the like, the freezer compartment temperature detecting means causes the preset freezer compartment temperature (eg, −18 ° C.) and the freezer compartment temperature range (eg, ±).
It is detected whether or not the upper limit of 1 deg) is exceeded. Upon receiving this signal, the cooling control means operates the compressor and the cool air circulation means, and operates the blowout port switching means so that the freezing chamber blowout port is opened to cool the freezing chamber.

When the temperature in the freezer compartment is lowered and the freezer compartment temperature detecting means detects that the temperature in the freezer compartment is below the lower limit of the temperature range of the freezer compartment, the cooling control means receives this signal and operates the compressor and the cold air circulating means. Then, the air outlet switching means is operated so that the freezer outlet is closed to stop the cooling.

Similarly, when the temperature in the refrigerating compartment rises, the refrigerating compartment temperature detecting means detects the preset refrigerating compartment temperature (for example, 3 ° C.) and the refrigerating compartment temperature range (for example, ± 1 de).
It is detected that the upper limit of g) is exceeded. Receiving this signal, the cooling control means operates the compressor and the cold air circulation means, and operates the blowout port switching means so that the refrigerating compartment outlet is opened to cool the refrigerating compartment.

When the temperature in the refrigerating compartment decreases and the refrigerating compartment temperature detecting means detects that the temperature in the refrigerating compartment exceeds the lower limit of the temperature range of the refrigerating compartment, the cooling control means receives this signal and stops the compressor and the cold air circulating means. The outlet switching means is operated so that the refrigerating compartment outlet is closed to stop the cooling.

The temperature rises both in the freezer compartment and the refrigerator compartment,
In the state where the freezing room temperature detecting means detects that the temperature range upper limit of the freezing room is exceeded and the refrigerating room temperature detection means detects that the temperature range upper limit of the refrigerating room is exceeded, the cooling control means is The circulation means is operated, and the outlet switching means is operated so that the freezer compartment outlet and the refrigerator compartment outlet are sequentially switched and opened and closed to cool the freezer compartment and the refrigerator compartment.

By performing such a cooling operation, the freezing compartment and the refrigerating compartment are completely independently cooled, and they are not influenced by each other, so that the temperature of the freezing compartment does not rise due to the cooling of the refrigerating compartment.

The cold air circulation amount by the cold air circulation means is
All of them can be used in the freezer compartment and the refrigerator compartment, so that the temperature inside the refrigerator can be made uniform.

Furthermore, since the air in the freezer compartment is cooled during cooling of the freezer compartment, it is more efficient than the conventional case where relatively high temperature air is sucked in to cool the freezer compartment. As compared with the conventional case where the mixed air in the freezer compartment and the refrigerator compartment is sucked in, the refrigerating effect is large because the intake air temperature is relatively high, for example, 3 ° C., and the refrigerating capacity is large because the suction specific volume is large. Very large cooling is possible.

Further, it becomes possible to cool the freezing compartment and the refrigerating compartment in accordance with the respective heat loads, and it is possible to sufficiently cool the refrigerating compartment even when a large heat load is applied only to the refrigerating compartment.

Further, the freezing compartment and the refrigerating compartment are maintained within a predetermined temperature range, the compressor and the cold air circulating means are stopped, and the outlet switching means closes the freezing compartment outlet and the refrigerating compartment outlet. When in the state, the cooling control means operates the outlet switching means so that the refrigerating compartment outlet is open and the freezing compartment outlet is closed, and the cold air circulation means is operated.

When frost is formed on the evaporator by normal operation, the air in the refrigerating chamber circulates in the cooler chamber to exchange heat with the evaporator. Therefore, the air in the refrigerating chamber is heated by sublimation or melting of frost. It is deprived of its heat and cooled slightly, and the temperature in the refrigerator compartment is maintained.

Further, in the evaporator, the amount of frost is reduced by heat exchange with the air in the refrigerating compartment, the reduction of the wind speed due to the reduction of ventilation resistance and the reduction of the heat transfer coefficient on the air side of the evaporator are prevented.

Further, when the freezing compartment door is opened during the cooling operation, the freezing compartment door opening / closing detection means detects the opening of the door and sends a signal to the cooling control means. While the opening is being detected, the outlet switching means is operated so that the freezer outlet is closed and the refrigerator outlet is opened.

When the refrigerator door is opened during the cooling operation, the refrigerator compartment door opening / closing detection means detects the door opening and sends a signal to the cooling control means, and the cooling control means receiving the signal detects the door opening. While it is in the state, the outlet switching means,
The refrigerator compartment outlet is closed and the freezer compartment outlet is opened.

By performing the operation when the door is opened and closed in this way, even if the door is opened and the room temperature rises, the other rooms are cooled. Therefore, after the door is closed, the room opened is opened. Therefore, it is possible to concentrate on re-cooling the temperature, and it is possible to quickly maintain the room in a predetermined temperature range.

Further, the cooling control means takes a defrosting time for each predetermined period, and when this defrosting time is started, the cooling control means stops the compressor and causes the blowout port switching means to move to the freezer compartment. Operate so that the outlet is closed and the refrigerator outlet is opened.

Further, by operating the cool air circulation means, the air in the refrigerating chamber is heat-exchanged with the evaporator, and the frost formed on the evaporator due to normal operation is sublimated or melted. After that, the defrosting time ends, and the cooling control means can return to the normal operation.

[0044]

FIG. 1 shows an embodiment of a refrigerator according to the present invention.
It will be described with reference to FIGS.

In FIG. 1, 1 is a freezing room, 2 is a refrigerating room,
3 is a freezer temperature detecting means, 4 is a refrigerating room temperature detecting means, 5
Is a freezer compartment door, 6 is a freezer compartment door opening / closing detection means, 7 is an evaporator,
Reference numeral 8 is a cold air circulation means, 11 is a refrigerating compartment door, and 12 is a refrigerating compartment door opening / closing detecting means. In the refrigerator, the compressor 15, the condenser 17, the capillary tube 18, and the evaporator 7 are sequentially connected in an annular shape to form a refrigeration cycle 19, and at least one freezer compartment 1 is provided below the heat insulating housing 22. , At least one refrigerating chamber 2 in the upper part, and a cooler chamber 20 in the inner part of the freezing chamber 1.
A machine room 21 is provided in the lower part of the back surface, and a cooling control means 16 is provided.

In the machine room 21, the compressor 15 and the condenser 1
An external fan 23 for forcibly cooling 7 is provided.

In the cooler chamber 20, an evaporator 7, a cool air circulating means 8 composed of a fan inside the refrigerator, a freezing chamber outlet 24 for sending cold air to the freezing chamber 1, and a cold chamber blowing air for sending cold air to the refrigerating chamber 2. An outlet 25 and an outlet switching unit 26 including an electric damper that opens and closes the freezer compartment outlet 24 and the refrigerator compartment outlet 25 to switch between the outlets are provided.

At least one freezing compartment door 5 is provided in the freezing compartment 1, and food and the like can be taken in and out by opening and closing the door.
The opening / closing of the door is detected by the freezing compartment door opening / closing detecting means 6 composed of a push switch which is pushed by the door member when the door is closed, and the freezing compartment temperature detection consisting of a thermistor in the freezing compartment 1 is detected. Means 3 are provided and freezer 1
Detects the temperature of.

Similarly, at least one refrigerating compartment door 11 is provided in the refrigerating compartment 2, and the opening / closing of the door is detected by the refrigerating compartment door opening / closing detecting means 12 composed of a push switch. A refrigerating compartment temperature detecting means 4 including a thermistor is provided to detect the temperature of the refrigerating compartment 2.

The cooling control means 16 receives signals from the refrigerating compartment temperature detecting means 4, the freezing compartment temperature detecting means 3, the freezing compartment door opening / closing detecting means 6 and the refrigerating compartment door opening / closing detecting means 12, and receives the signals from the compressor 15. The outlet switching means 26 and the cold air circulation means 8 are operated.

Further, the cooling control means 16 opens the freezing compartment outlet 24 and opens the refrigeration compartment outlet 25 by operating the outlet switching means 26 for a predetermined time when the compressor 15 is stopped. I am letting you.

In addition, by operating the cold air circulation means 8, it is possible to cause the evaporator 7 to exchange heat with the air in the refrigerating compartment 2 which is at a relatively high temperature of 3 ° C., for example.

Further, the cooling control means 16 opens the freezing compartment door 5 during the cooling of the freezing compartment 1 and receives the signal from the freezing compartment door opening / closing detecting means 6 that the opening of the freezing compartment door is detected, so that the door is opened. During this period, the outlet switching means 26 is operated so that the freezer compartment outlet 24 is closed and the refrigerator compartment outlet 25 is opened.

Further, during cooling of the refrigerating compartment 2, the refrigerating compartment door 11
When the door is opened and the door open state is received from the refrigerating room door opening / closing detection means 12, while the door is open,
The outlet switching means 26 is operated to close the refrigerating compartment outlet 25 and open the freezer compartment outlet 24.

Further, the cooling control means 16 has an internal timer 27, which provides a defrosting time for each predetermined period, stops the compressor 15 during the defrosting time, and operates the outlet switching means 26. The freezer compartment outlet 24 is closed and the refrigerator compartment outlet 2
5 should be open. In addition, by operating the cold air circulation means 8 composed of an internal fan, it is possible to cause the evaporator 7 to exchange heat with the relatively high temperature air of, for example, 3 ° C. in the refrigerating compartment 2.

The operation of the refrigerator of this embodiment having the above structure will be described below.

First, the cooling operation of the refrigeration cycle 19 will be described. The compressor 1 is instructed by the cooling control means 16.
5, the high temperature and high pressure refrigerant is discharged from the compressor 15, the refrigerant is forcibly cooled by the outside fan 23 in the condenser 17 to be condensed and liquefied, and is decompressed by the capillary tube 18, and the depressurized refrigerant is evaporated. The refrigerant evaporated and vaporized in the evaporator 7 takes heat of vaporization from the air around the evaporator 7 and is cooled, and the refrigerant evaporated in the evaporator 7 is again sucked into the compressor 15. Cold air circulation means 8
The air is circulated to the freezer compartment 1 and the refrigerating compartment 2 by the operation of the air outlet switching means 26 and the heat is transferred to perform cooling.

During normal operation, the temperature of the freezer compartment 1 is detected by the freezer compartment temperature detecting means 3, the refrigerating compartment 2 is detected by the refrigerating compartment temperature detecting means 4, and the temperature of the room is invaded by heat from the heat insulating housing 22 and frozen. It rises by opening and closing the room door 5 and the refrigerating room door 11 and storing a heat load such as food. The cooling operation is performed in time with respect to such a temperature rise in the room to maintain the room temperature. These cooling operations include the case of cooling only the freezing room 1 and the case of cooling only the refrigerating room 2. And the case where both the freezer compartment 1 and the refrigerating compartment 2 are cooled.

FIG. 2 shows the case where only the freezer compartment 1 is cooled.
The operation will be described based on the time chart of.

The temperature of the freezer compartment 1 is determined by the freezer compartment temperature detecting means 3
The temperature is detected by a predetermined freezing room temperature (for example, -18 ° C) and the freezing room temperature range (for example ±
It is detected that the upper limit Tfh of 1 deg) is exceeded (t
1, t3). Upon receiving the detected signal, the cooling control means 16 operates the compressor 15 and the cold air circulation means 8 and operates the outlet switching means 26 to open the freezing compartment outlet 24 to cool the freezing compartment 1.

When the temperature in the freezer compartment 1 decreases and the freezer compartment temperature detecting means 3 detects that it exceeds the lower limit Tf1 of the freezer compartment temperature range (t2), the cooling control means 16 receives this detection signal and the compressor 15 receives. Then, the cold air circulation means 8 is stopped, and the outlet switching means 26 is operated so as to close the freezer compartment outlet 24 to stop the cooling.

By repeating the above operation, the temperature of the freezer compartment 1 is maintained. Next, the operation when only the refrigerating compartment 2 is cooled will be described based on the time chart of FIG.

The temperature of the refrigerating compartment 2 is determined by the refrigerating compartment temperature detecting means 4
Temperature of the refrigerating room (for example, ± 1d)
It is detected that the upper limit Trh of (eg) is exceeded (t1, t
3). Receiving this detection signal, the cooling control means 16 operates the compressor 15 and the cold air circulation means 8 and operates the outlet switching means 26 to open the refrigerating compartment outlet 25 to cool the refrigerating compartment 2.

When the temperature inside the refrigerating compartment 2 decreases and the refrigerating compartment temperature detecting means 4 detects that it exceeds the lower limit Tr1 of the refrigerating compartment temperature range (t2), the cooling control means 16 receives this detection signal and the compressor 15 receives. Then, the cooling air circulation means 8 is stopped, and the outlet switching means 26 is operated so as to close the refrigerating compartment outlet 25 to stop the cooling.

The temperature of the refrigerator compartment 2 is maintained by repeating the above operation. The operation of cooling both the freezing compartment 1 and the refrigerating compartment 2 will be described with reference to the time chart of FIG.

When the temperature of the freezing compartment 1 exceeds the upper limit Tfh of the temperature range at t1, the cooling operation of the freezing compartment 1 is performed as described above, and at t2 and t4 during cooling of the freezing compartment 1,
When it is detected that the temperature of the refrigerating compartment 2 exceeds the upper limit Trh of the temperature range, the cooling control means 16 receives this detection signal and determines that the cooling operation of the freezing compartment 1 and the refrigerating compartment 2 is necessary. The outlet switching means 26 is operated so that the freezer outlet 24 and the refrigerator outlet 25 are sequentially opened and closed.

First, the outlet switching means 26 is operated so that the freezing compartment outlet 24 is opened and the refrigerating compartment outlet 25 is closed, and after the time tf has elapsed, the outlet switching means 26 is operated to freeze. The room outlet 24 is closed, the refrigerating room outlet 25 is opened, and after the time tr has elapsed, the freezing room outlet 24 is opened again in the air outlet switching means 26, and the refrigerating room outlet 25 is opened.
Drive to shut.

When the temperature of the refrigerating compartment 2 exceeds the lower limit Tr1 of the temperature range (t3, t5), the cooling of the refrigerating compartment 2 is completed, the cooling operation of only the freezing compartment 1 is resumed, and the refrigerating compartment 2 is frozen during the cooling operation. The same applies when the chamber 1 is cooled.

By performing such a cooling operation, the freezing compartment 1 and the refrigerating compartment 2 are cooled completely independently, so that the cold air in the freezing compartment 1 is used when cooling the refrigerating compartment 2 as in the conventional case. Although the temperature of the freezer compartment 1 rises due to this, since the respective compartments are not affected by each other, the temperature of the freezer compartment 1 will not rise due to the cooling of the refrigerating compartment 2.

Further, the cold air circulation means 8 for independent cooling
Since it is not necessary to divide the air flow rate into each room, 100% of the fan air flow can be used in each room, which is efficient.

Since the cooling can be performed independently, the freezer compartment 1
Since it sucks the air in the freezer compartment 1 to cool it, it is more efficient than mixing and sucking the air in the freezer compartment 1 and the refrigerating compartment 2 as in the conventional case, and when cooling the refrigerating compartment 2. In comparison with the conventional case where the mixed air in the freezer compartment 1 and the refrigerator compartment 2 is sucked in, the intake air temperature becomes relatively high, for example, 3 ° C, the refrigerating effect is large, the suction specific volume is large, and the refrigerating capacity is extremely high. Greater cooling is possible.

Further, it is possible to cool the freezer compartment 1 and the refrigerating compartment 2 according to their respective heat loads, and for example, even when a large heat load is applied only to the refrigerating compartment 2, the refrigerating compartment 2 can be sufficiently cooled. Further, it is possible to rapidly cool the whole or a part of the refrigerating room 2.

Regarding the operation of the outlet switching means 26 so as to open and close the freezer compartment outlet 24 and the refrigerator compartment outlet 25 in sequence, the freezer compartment outlet 24 was opened first, but the refrigerator compartment outlet was opened. The outlet 25 may be opened first.

Next, the operation when cooling is stopped will be described with reference to the time chart of FIG.

The freezer compartment 1 and the refrigerating compartment 2 are maintained within a predetermined temperature range, the compressor 15 and the cold air circulating means 8 are stopped, and the outlet switching means 26 is operated by the freezer compartment outlet 24 and the refrigerator compartment outlet 2.
After the time tm has passed from the time when the state of closing 5 and the state of closing (t1, t4), the cooling control means 16 opens the outlet switching means 26 in the refrigerating compartment outlet 25 and the freezing compartment outlet 24.
Is operated so as to be closed, and the cold air circulation means 8 is also operated (t2).

With respect to the frost formation on the evaporator 7 caused by the normal operation, the air in the refrigerating compartment 2 circulates in the cooler compartment 20 and exchanges heat with the evaporator 7. Since the heat is taken away by the sublimation or melting of the frost and the frost is slightly cooled, the temperature of the refrigerator compartment 2 is maintained.

Further, since the amount of frost formed on the evaporator 7 is reduced by heat exchange with the air in the refrigerating compartment 2, a reduction in air flow resistance due to a reduction in ventilation resistance is prevented, and a heat transfer coefficient on the air side of the evaporator 7 is reduced. Can be prevented.

After the elapse of the predetermined time td, the cooling control means 16 operates the outlet switching means 26 so that the refrigerating compartment outlet 25 is closed and stops the cold air circulation means 8 (t
3) After that, the temperature of each chamber rises and cooling is performed again.
However, when a signal that the temperature of each room exceeds the upper limit of the temperature range is sent, the cooling operation described above is started even within the time td.

As a result, in normal operation, the heat exchanger can always be operated in a good state, that is, in a state with little frost formation, so that efficient cooling can be performed, which is effective in reducing the amount of power consumption. Since it is possible to eliminate the influence of, the size of the evaporator 7 can be reduced, which is effective in improving the volumetric efficiency.

If tm is 0, the above-described operation can be performed after the cooling operation, so that the loss at the time of starting the cold air circulation means 8 can be reduced and the power consumption can be reduced.

Next, the operation when the door is opened and closed will be described with reference to the time chart of FIG.

Cooling of the freezer compartment 1 is started from t1, and t2
When the freezer compartment door 5 is opened at, the freezer compartment door open / close detection means 6
Detects the opening of the door and sends a signal to the cooling control means 16.
The cooling control means 16 that has received the signal operates the outlet switching means 26 to close the freezer compartment outlet 24 and close the freezer compartment outlet 2 as long as the refrigerator compartment 2 does not exceed the lower limit of the refrigerator compartment temperature range.
5 is opened.

When the temperature in the refrigerating compartment 2 exceeds the lower limit of the refrigerating compartment temperature range, the cold air circulating means 8 is stopped, and when the freezing compartment door 5 is closed at t3, the freezing compartment door opening / closing detecting means 6 is activated. The closed state of the door is detected, a signal is sent to the cooling control means 16, and the cooling control means 16 having received the signal continues the operation before opening and closing the door.

When the cooling of the freezer compartment 1 and the refrigerating compartment 2 is started at t4 and the refrigerating compartment door 11 is opened at t5, the refrigerating compartment door opening / closing detecting means 12 detects the open state of the door and controls the cooling of the signal. Cooling control means 16 which has been sent to the means 16 and has received the signal
As long as the freezer compartment 1 does not exceed the lower limit of the freezer compartment temperature range, the outlet switching means 26 is operated to close the refrigerating compartment outlet 25 and open the freezer compartment outlet 24. When the temperature in the freezer compartment 1 exceeds the lower limit of the freezer compartment temperature range,
When the cold air circulation means 8 is stopped and the refrigerating compartment door 11 is closed at t6, the refrigerating compartment door opening / closing detection means 12 detects the closed state of the door, sends a signal to the cooling control means 16, and receives the signal. The means 16 continues the operation before opening and closing the door,
At t7, the cooling of the refrigerating compartment 2 is completed.

By performing the operation when the door is in the open / closed state in this way, even if the door is opened and the room temperature rises, the other room is cooled, so the door is opened and then opened. It is possible to concentrate on re-cooling the temperature of the room and quickly maintain the room in a predetermined temperature range.

Next, the operation of slow frost will be described. The cooling control means 16 takes a defrosting time every predetermined period,
When the slow frost time starts, the cooling control means 16 stops the compressor 15 and operates the outlet switching means 26 so that the freezer compartment outlet 24 is closed and the refrigerating compartment outlet 25 is opened. . Further, by operating the cold air circulation means 8,
When the air in the refrigerating compartment 2 is heat-exchanged with the evaporator 7, the frost formed on the evaporator 7 caused by normal operation is sublimated or melted, and after a predetermined time has elapsed, the slow frost time ends. The cooling control means 16 restores normal operation.

As a result, it is possible to eliminate the slow frost from the heater, improve the volumetric efficiency by reducing the heater volume, and since there is no heat loss of the evaporator due to the slow frost heater, it is possible to prevent the temperature of the freezing chamber from rising. It enables reduction of power consumption for recooling.

In this embodiment, the freezer compartment 1 is located below and the refrigerating compartment 2 is located above.
Is the same as above and the refrigerating compartment 2 is below, and the cooler compartment 20 is provided at the back of the freezing compartment 1.
There is no problem even in the deep part of the refrigerating room 2, and it is the same even if it is provided in the barrier part between the freezing room 1 and the refrigerating room 2.

In the cooling of the condenser 17, the external fan 23 is used for forced cooling, but a part of the condenser 17 is buried in the heat insulating housing 22, or the machine room 21 is cooled.
The same applies to the case where the condenser 17 is installed outside the machine and the machine is naturally cooled without using the outside fan 23.

Further, in this embodiment, the freezer compartment 1 and the refrigerator compartment 2
Although the air outlet switching means 26 is provided for the air outlet of each chamber, the same effect can be obtained by providing the air outlet switching means 26 at the air inlet.

[0091]

As described above, according to the refrigerator of the present invention, a refrigerating cycle in which a compressor, a condenser, a capillary tube and an evaporator are sequentially connected in an annular shape is installed, and at least one refrigerating chamber and at least one refrigerating chamber are provided. Two refrigerating chambers, evaporator, cold air circulation means, freezing chamber outlet for sending cold air to the freezing chamber, refrigerating chamber outlet for sending cold air to the refrigerating chamber, and outlet switching for switching between the freezing chamber outlet and the refrigerating chamber outlet A cooler room having means, a freezer room temperature detecting means provided in the freezer room, a refrigerating room temperature detecting means provided in the refrigerating room, the compressor,
By providing the cooling control means for operating the blower outlet switching means and the cold air circulation means to sequentially switch the freezer compartment outlet and the refrigerating compartment blower outlet, the cooling capacity of the freezer compartment and the refrigerating compartment is improved, and high efficiency is achieved. Can provide a simple refrigerator.

Further, the cooling control means operates the outlet switching means for a predetermined time when the compressor is stopped to close the freezer compartment outlet and open the refrigerating compartment outlet to operate the cold air circulation means. As a result, heat can be exchanged between the refrigerating room air and the evaporator, so that a refrigerator capable of maintaining high heat exchange performance can be provided.

Further, at least one freezing compartment door, at least one refrigerating compartment door, and freezing compartment door opening / closing detecting means,
Refrigerator door opening / closing detection means is provided, and while the freezing compartment door opening / closing detection means detects the open state of the freezing compartment during cooling operation, the cooling control means operates the outlet switching means to close the freezing compartment outlet. Then, the refrigerating compartment outlet is opened, and while the refrigerating compartment door opening / closing detecting means is detecting the open state of the refrigerating compartment, the cooling control means operates the outlet switching means to operate the refrigerating compartment outlet. Since it is closed and the freezer outlet is opened, it is possible to provide a refrigerator that can reduce power loss when the freezer door is opened.

Furthermore, a defrosting time is provided every predetermined period, the compressor is stopped during the defrosting time, the blower outlet switching means is operated to close the freezer compartment outlet, and the refrigerating compartment outlet is opened. Since the air in the refrigerating room and the evaporator are heat-exchanged by the cold air circulation means, it is possible to prevent a temperature rise in the freezing room, reduce the power consumption for recooling, and provide a refrigerator with high volume efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a time chart showing the cooling operation of the freezer compartment of the refrigerator.

FIG. 3 is a time chart showing the cooling operation of the refrigerator compartment of the refrigerator.

FIG. 4 is a time chart showing the cooling operation of the freezer compartment and the refrigerator compartment of the refrigerator.

FIG. 5 is a time chart showing a cooling operation when the refrigerator is stopped.

FIG. 6 is a time chart showing the cooling operation when opening and closing the door of the refrigerator.

FIG. 7 is a sectional view of a conventional refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Freezing room 2 Refrigerating room 3 Freezing room temperature detecting means 4 Refrigerating room temperature detecting means 5 Freezing room door 6 Freezing room door opening / closing detecting means 7 Evaporator 8 Cold air circulating means 11 Refrigerating room door 12 Refrigerating room door opening / closing means 15 Compressor 16 Cooling Control Means 17 Condenser 18 Capillary 19 Refrigeration Cycle 20 Cooler Chamber 24 Freezer Chamber Outlet 25 Refrigerator Outlet 26 Outlet Switching Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshinori Noda 4-5 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerator Co., Ltd. (72) Inventor Shinichi Kanaoka 4-chome Takaidamoto-dori, East Osaka No. 2-5 Matsushita Cold Machinery Co., Ltd.

Claims (4)

[Claims] 1. A refrigeration cycle in which a compressor, a condenser, a capillary tube, and an evaporator are sequentially connected in an annular shape is installed, and at least one freezer compartment, at least one refrigerating compartment, an evaporator, a cold air circulation means, and a freezer. A freezer compartment for sending cold air to the room, a refrigerating compartment outlet for sending cold air to the refrigerating compartment, and a cooler compartment having an outlet switching means for switching between the refrigerating compartment outlet and the refrigerating compartment outlet; It is provided with a freezer compartment temperature detecting means, a refrigerating compartment temperature detecting means provided in the refrigerating compartment, a cooling control means for operating the compressor, the outlet switching means, and the cold air circulating means to switch between the freezer compartment and the refrigerator outlet. Fridge. 2. The cooling control means, when the compressor is stopped, operates the outlet switching means for a predetermined time to close the freezer compartment outlet, open the refrigerating compartment outlet, and operate the cold air circulation means. The refrigerator according to claim 1, wherein heat is exchanged between the air in the refrigerating compartment and the evaporator. 3. At least one freezing compartment door, at least one refrigerating compartment door, freezing compartment door opening / closing detection means, and refrigeration compartment opening / closing detection means are provided, and the freezing compartment door opening / closing detection means is a door during cooling operation. While the open state is being detected, the cooling control means operates the outlet switching means to close the freezer compartment outlet, open the refrigerating compartment outlet, and the refrigerating compartment door open / close detection means opens the door. The refrigerator according to claim 1 or 2, wherein the cooling control means operates the outlet switching means to close the refrigerating compartment outlet and open the freezing compartment outlet while detecting. 4. A defrosting time is provided for each predetermined period, the compressor is stopped during the defrosting time, the outlet switching means closes the freezer compartment outlet, opens the refrigerating compartment outlet, and cools air circulation. The refrigerator according to any one of claims 1 to 3, wherein heat is exchanged between the air in the refrigerating chamber and the evaporator by means.