JPH0989434A - Refrigerator with deep freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the food temperature in a refrigerator substantially constant by providing pressure reducing means for alternately switching a damper during the operating of a capacity control compressor to vary the evaporating temperature of an evaporator at the time of cooling, and reducing the refrigerating capacity as compared with that at the time of cooling a deep freezing chamber at the time of normally cooling a cold storage chamber. SOLUTION: When the cooling time of a cold storage chamber 3 is entered, the circulating cold gas cooled by an evaporator 7 is introduced to the chamber 3 via a cold storage damper 5a by an evaporator fan 9, a predetermined time is elapsed, and then the damper 5a is closed. When the damper 5a is opened, the pressure reducing amount of pressure reducing means is simultaneously switched, and when the evaporating temperature of the evaporator 7 is raised to the vicinity of the cold storage chamber temperature, the suction pressure increases, the refrigerant circulating amount of a capacity control compressor 6 becomes twice to three times as compared with the evaporating temperature at the time of cooling in a deep freezing chamber 3, and the freezing capacity is increased. At this time, the compressor 6 controls the capacity, operates at 20Hz of about 1/3 at the time of cooling the chamber 3 to reduce the refrigerant circulating amount to 3 to 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control technique in a refrigerator-freezer having two or more chambers having different temperature zones.

[0002]

2. Description of the Related Art A conventional freezer / refrigerator of this type is disclosed in, for example, Japanese Utility Model Publication No. 7-159014, and will be described below with reference to FIG. 10 showing a schematic sectional view of the refrigerator / freezer.

In FIG. 10, reference numeral 51 denotes a refrigerator box, and 52
Is a freezing compartment, 53 is a refrigerating compartment, 54 is a freezing temperature sensor of the refrigerating compartment 52, and 55 is a refrigerating temperature sensor of the refrigerating compartment 53, which controls the opening and closing of the refrigerating damper 55a. 56 is a compressor, 5
7 is an evaporator, 58 is a defrosting heater, and 59 is an evaporator fan.

In the conventional freezer-refrigerator as described above, during normal operation of the refrigerator, the compressor 56 is operated by the signal from the freezing temperature sensor 54 installed in the freezer compartment 52, and the evaporator fan 59 is simultaneously rotated. Then, the return cold air from the freezer compartment 52 and the refrigerating compartment 53 passes through the evaporator 57, during which the cool air is cooled.

Then, the cooled cold air is reused in the freezer compartment 5.
2, and the freezer compartment 52 is cooled to a predetermined temperature. In this case, if the refrigerating chamber 53 is higher than a predetermined temperature,
The refrigerating damper 55a is in an open state, and cold air is sent to the refrigerating chamber 53 through the refrigerating damper 55a to cool the refrigerating chamber 53. If the temperature of the refrigerating chamber 53 is lower than the predetermined temperature, the refrigerating damper 55a is in the closed state, and the cool air is not sent to the refrigerating chamber 53.

Further, the frost on the evaporator 57 during operation is
By periodically energizing the defrosting heater 58, the evaporator 5
7 is heated for defrosting.

[0007]

However, in the above-mentioned refrigerator / freezer, the compressor 5 is not used during normal use.
If the temperature of only the refrigerating compartment 53 rises during the stop of 6,
The temperature of the freezer compartment 52 also rises, and until the compressor 56 and the evaporator fan 59 start operating, the temperature is not cooled and optimum temperature control cannot be performed.

Then, while the compressor 56 is stopped, the evaporator fan 59 is operated to send the relatively low temperature cold air cooled by the evaporator 57, which has a temperature far lower than that of the refrigerating chamber 53, to the refrigerating chamber 53. Even if the refrigerating chamber 53 is cooled by, most of the relatively low temperature cold air is sent to the freezing chamber 52, so that the temperature of the freezing chamber 52 rises quickly, and as a result, the compressor 56 can be operated more than necessary. There is a problem that it becomes necessary and leads to an increase in power consumption.

Further, in the above-mentioned refrigerator / freezer, it is necessary to periodically defrost a large amount of frost attached to the evaporator 57 by the water in the freezer compartment 52 and the refrigerator compartment 53.

For defrosting, the defrosting heater 58 is energized to heat the air, and the heated air is convected in the evaporator 57.
The frost is melted by raising the temperature of the evaporator 57. At this time, however, the defrosting time becomes long because a large amount of frost is melted, and the energization heating amount to the defrosting heater 58 becomes large, and the generated heat is generated. There is also a problem that the load is increased and the temperature of the food in the freezer compartment 52 is temporarily increased due to the generated heat load, so that the maintenance of the freshness of the food is shortened.

Moreover, since the indoor temperature is high after the defrosting is completed, the operation time of the compressor 56 after the defrosting is also prolonged, which causes a problem that the power consumption is increased.

As described above, the conventional refrigerator-freezer has problems such as an increase in power consumption and a shorter freshness maintenance period in terms of food preservation.

The present invention solves the above-mentioned conventional problems, and requires cooling by opening and closing dampers provided in the freezing room, the refrigerating room, etc. when the temperature rises due to the load. It can supply the required amount of cool air only to the room and minimize the effect on other rooms.In addition, the amount of frost on the evaporator can be reduced to reduce the temperature rise during defrosting. An object of the present invention is to provide a freezer-refrigerator that can keep the temperature of food inside the container almost constant.

[0014]

In order to solve this problem, the refrigerator-freezer of the present invention is a cooling system in which a capacity control compressor capable of controlling the refrigerating capacity, a condenser, a pressure reducing means, an evaporator and a suction line are combined. And a condenser fan for cooling the capacity control compressor and the condenser by the cool air from the cooling system, and an evaporator room, a freezer room and a refrigerating room in which the evaporator, the cooler fan and the defrost heater are arranged. A refrigerator box provided, a temperature sensor for detecting the room temperature of the refrigerating room and the freezing room, a cooling duct communicating with each of the evaporator room, the freezing room, and the refrigerating room, and each of the refrigerating room and the freezing room To the cooling duct, a damper for opening and closing the cold air outlet, a signal from the temperature sensor, the capacity control compressor and the condenser fan. System, the system control means for controlling the cooler fan and the damper, and the damper of each chamber are alternately opened and closed during the operation of the capacity control compressor, and the evaporation temperature of the evaporator is controlled during cooling of each chamber. With a pressure reducing means for changing, during normal cooling operation of the refrigerating room,
This is to reduce the refrigerating capacity of the capacity control compressor as compared with the cooling operation of the freezing room.

Further, the condenser fan has a variable rotation speed, and when the temperature rising gradient of the refrigerating compartment becomes larger than a preset temperature rising gradient, only the damper for opening and closing the cold air outlet communicating with the refrigerating compartment is opened. However, it is also possible to increase the capacity of the capacity control compressor more than the capacity during the normal cooling operation of the refrigerating room and increase the rotation speeds of the condenser fan and the cooler fan whose rotation speeds can be changed.

Further, when the temperature rise gradient of the freezer compartment becomes larger than the preset temperature rise gradient, only the damper for opening and closing the cold air outlet communicating with the freezer compartment is opened to exceed the capacity in the normal cooling operation of the freezer compartment. It is also possible to increase the capacity of the capacity control compressor and increase the rotation speeds of the condenser fan and the cooler fan whose rotation speeds can be changed.

Further, a quenching switch is provided, and when the quenching switch is on, only the damper for opening and closing the cold air outlet communicating with the refrigerating compartment is opened, and the capacity of the capacity control compressor exceeds the capacity during normal cooling operation of the refrigerating compartment. May be increased to increase the rotational speeds of the condenser fan and the cooler fan whose rotational speeds can be varied.

Further, it is possible to install a cooler fan whose rotation speed can be varied and reduce only the rotation speed of the cooler fan during the normal cooling operation of the refrigerating compartment.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, according to the present invention, when the temperature of a freezing room, a refrigerating room or the like rises, a damper is opened / closed so that cold air can be supplied only to the room whose temperature has risen. During normal operation of, the system control means receives the signal of the temperature sensor installed in the freezer,
A capacity control compressor (for example, a capacity control compressor capable of converting the frequency to 100 to 20 Hz) repeats operation and stop while performing capacity control, and at the same time operates a condenser fan that cools the condenser and the capacity control compressor.

Further, the cooler fan also operates, the circulating cold air cooled by the evaporator is circulated through the cooling duct, and a damper for opening and closing the freezing room and the refrigerating room for exclusive use is provided in the cooling duct communicating with each room. When the capacity control compressor stops, the damper that opens and closes each chamber is fully closed, and the condenser fan and the cooler fan also stop.

During normal cooling of the freezing compartment, the capacity control compressor operates at 60 Hz, only the opening / closing damper provided in the cooling duct of the freezing compartment is opened for a certain period of time, and the evaporating temperature of the evaporator is about -30 ° C. by the pressure reducing means. Set to reduce the pressure to.

The cool air cooled by the evaporator is guided by the cooler fan to the freezer through the damper to cool only the freezer, and after a certain period of time, the damper in the freezer is closed.

Subsequently, only the damper in the refrigerating compartment is opened for a certain period of time to start cooling the refrigerating compartment, and as in the case of cooling the freezing compartment, the circulating cold air cooled in the evaporator is refrigerated through the damper by the cooler fan. Guided to the room, only the refrigerating room is cooled, and after a certain time, the damper in the refrigerating room is closed.

Further, when the damper of the refrigerating chamber is opened, the decompression amount of the decompression means is switched, and the evaporation temperature of the evaporator rises to near the temperature of the refrigerating chamber. Thus, the decompression amount of the decompression means is changed to evaporate temperature. By increasing the temperature to near the temperature of the refrigerating chamber, the suction pressure becomes high, and the refrigerant circulation amount of the compressor becomes 2-3 times as high as the evaporation temperature at the time of cooling the freezing chamber at -30 ° C, and the refrigerating capacity is increased. Will increase.

At this time, the capacity control compressor performs capacity control and operates at 20 Hz, which is about 1/3 of that in cooling in the freezing room, to reduce the refrigerant circulation amount to 3: 1.

At the same time that the pressure reducing means switches the pressure reducing amount,
Capacity control When the compressor controls the capacity, the evaporation temperature rises and the suction pressure rises when the refrigerating room is cooled, so the compressor can operate at a low compression ratio and operate efficiently. .

Therefore, when the refrigerating compartment is cooled, the refrigerating compartment is operated in the high evaporation temperature range, so that the operating efficiency through the normal cooling operation of the freezing compartment and the refrigerating compartment is improved.

Further, a condenser fan whose rotation speed can be varied and an evaporator fan are installed, and only the damper in the refrigerating compartment is opened only when the temperature rising gradient in the refrigerating compartment becomes larger than a preset temperature rising gradient. However, it is also possible to increase the capacity of the capacity control compressor beyond the capacity during the normal cooling operation of the refrigerating compartment, and to increase the number of rotations of the condenser fan and the cooler fan by changing them.

For example, a large amount of food enters only the refrigerating room,
When the temperature of the refrigerating room rises rapidly, temperature information is input to the system control means from the temperature sensor of the refrigerating room, and when the gradient of the temperature input value is equal to or higher than the preset temperature rising gradient, the frequency of the capacity control compressor is changed. The operation is performed at 40 Hz, which is twice the normal cooling operation, to double the amount of refrigerant circulation.

At this time, by increasing the number of rotations of the condenser fan, the condenser capacity corresponding to the increased refrigerant circulation amount is increased, and at the same time, the number of rotations of the evaporator fan is also increased to double the number. It is possible to effectively bring out the refrigerating capacity, and it is possible to quickly respond to the increase of food in the refrigerating room and cool it.

Further, only when the temperature rising gradient of the freezing compartment becomes larger than the preset temperature rising gradient, only the damper of the freezing compartment is opened to increase the capacity of the capacity control compressor more than the capacity during the normal cooling operation of the freezing compartment. It is also possible to increase the number of revolutions of the condenser fan and the cooler fan which can be increased and whose number of revolutions can be changed.

For example, a large amount of food enters only the freezer,
When the temperature in the freezer compartment rises abruptly, the temperature sensor in the freezer compartment inputs the temperature rise to the system control means.When the gradient of the temperature input value is equal to or higher than the preset temperature rise gradient, the frequency of the capacity control compressor is changed. Maximum control width of 100Hz
Thus, the refrigerant circulation amount is increased by about 1.5 times.

At this time, by increasing the rotation speed of the condenser fan, the condenser capacity corresponding to the increased refrigerant circulation amount is increased, and at the same time, the rotation speed of the evaporator fan is also increased to about 1.5 times. It is possible to effectively draw out the increased refrigeration capacity, and it is possible to quickly respond to the increase in the amount of food in the freezing room and perform cooling.

Further, a quenching switch is provided, and when the quenching switch is turned on, only the damper in the refrigerating compartment is opened, the capacity of the capacity control compressor is increased beyond the capacity during normal cooling operation of the refrigerating compartment, and the rotational speed is variable. By increasing the number of rotations of the condenser fan and the cooler fan, it is possible to effectively cool foods and beverages that have been put in them, by turning on the rapid cooling switch.

At this time, the frequency of the capacity control compressor is set to 2 to 2 during the normal cooling operation by the signal of the system control means, for example.
Operate at 3 to 40 times the frequency of 40 to 60 Hz, and set the refrigerant circulation amount to 2 to
Increase to about 3 times.

By increasing the rotation speed of the condenser fan, the condenser capacity corresponding to the increased refrigerant circulation amount is increased, and at the same time, the rotation speed of the evaporator fan is also increased, so that it is increased by 2 to 3 times. It is possible to effectively bring out the above-mentioned refrigerating capacity, and it is possible to efficiently cool foods and beverages arbitrarily placed when they are desired to be quickly cooled.

Further, by reducing the rotation speed of the cooler fan during the normal cooling operation of the refrigerating compartment, during the cooling operation of the refrigerating compartment, the air volume of the evaporator fan becomes smaller than that of the cool air when cooling the freezing compartment. By reducing the number of rotations, reducing the cold air velocity that directly hits the stored food in the refrigerator compartment, and reducing the cold air velocity that directly hits the stored food, it is possible to prevent the food from drying.

[0038]

FIG. 1 to FIG. 9 show an embodiment of the present invention.
Will be described with reference to.

FIG. 1 is a schematic sectional view of a refrigerator-freezer according to an embodiment of the present invention, FIG. 2 is a cooling system diagram in the refrigerator-freezer, FIG. 3 is a timing chart in the refrigerator-freezer, and FIG. 4 is an operation cycle of the refrigerator-freezer. It is a Mollier diagram of.

In FIG. 1, 1 is a refrigerator box, 2 is a freezing compartment, 3 is a refrigerating compartment, 4 is a freezing temperature sensor in the freezing compartment 2, 4
a is a refrigeration damper whose opening and closing is controlled by receiving a signal from a freezing temperature sensor 4 which sets and adjusts the temperature of the freezing chamber 5, 5 is a refrigerating temperature sensor of the refrigerating chamber 3, and 5a is a refrigerating temperature sensor 5.
Refrigerator damper controlled to open and close by 6, 6 is 100-20
Capacity control compressor controlled at a frequency of Hz, 7 is an evaporator, 8 is a defrosting heater, 9 is an evaporator fan, 10 is system control means, and capacity control is performed by receiving a control signal from the freezing temperature sensor 4. A control signal for stopping the operation of the compressor 6 and the like is output. A cooling duct 11 communicates with the freezing compartment 2 and the refrigerating compartment 3. The freezing compartment 2 has a cooling air outlet 2a.
And a freezing damper 4a, and a cold air outlet 3a in the refrigerator compartment 3
And a refrigerating damper 5a are installed.

2 and 5, 12 is a condenser,
Reference numeral 12a denotes the capacity control compressor 6 and the condenser 1 during the cooling operation.
A condenser fan that cools 2 is a decompression means, and 14 is a suction line that is sequentially connected to the capacity control compressor 6 and the evaporator 7 to form a cooling system 15.

In FIG. 5, which shows another cooling system diagram in the refrigerator-freezer, 16 is a condenser fan whose rotation speed is variable, and 17 is an evaporator fan whose rotation speed is variable.

The operation of the cooling system in the refrigerator / freezer thus constructed will be described (see FIGS. 3 and 4).

During normal operation of the freezer-refrigerator, the system control means 10 receives a signal from the freezing temperature sensor 4 installed in the freezer compartment 2 and the capacity control compressor 6 (for example, capacity control capable of converting frequency to 100 to 20 Hz). The compressor) is repeatedly operated and stopped while controlling the capacity.

In response to the signal from the system control means 10, the capacity control compressor 6 operates, and at the same time, the condenser fan 12a for cooling the condenser 12 and the capacity control compressor 6 also operates.
Further, the evaporator fan 17 is also operated to circulate the circulated cold air cooled by the evaporator 7 through the cooling duct 11, and the dedicated freezing for these chambers provided in the cooling duct 11 communicating with the freezing chamber 2 and the refrigerating chamber 3 is performed. The cycle in which the damper 4a and the refrigerating damper 5a are sequentially opened for one predetermined time is repeated. When the capacity control compressor 6 stops, the freezing damper 4a and the refrigerating damper 5a that open and close each chamber are closed, and the condenser fan 12a and the evaporator fan 9 also stop.

During normal cooling of the freezer compartment 2, the capacity control compressor 6 is operated at 60 Hz, and the cooling duct 11 of the freezer compartment 2 is operated.
Only the refrigeration damper 4a provided in the above is opened for a certain period of time, and the evaporation temperature of the evaporator 7 is set to be reduced to about −30 ° C. by the pressure reducing means 13. The cool air cooled by the evaporator 7 is guided by the evaporator fan 9 to the freezing compartment 2 through the freezing damper 4a to cool only the freezing compartment 2 and after a certain time has passed, the freezing damper 4a of the freezing compartment 2 is Close.

Next, when only the refrigerating damper 5a in the refrigerating chamber 3 is opened for a certain period of time and the refrigerating chamber 3 is cooled, the circulating cold air cooled by the evaporator 7 is the same as in the case of cooling the freezing chamber 2. The evaporator fan 9 is guided to the refrigerating compartment 3 through the refrigerating damper 5a to cool only the refrigerating compartment 3 and after a certain period of time, the refrigerating damper 5a in the refrigerating compartment 3 is closed.

When the refrigerating damper 5a in the refrigerating chamber 3 is opened and at the same time the depressurizing amount of the depressurizing means 13 is switched to raise the vaporizing temperature of the evaporator 7 to near the refrigerating chamber temperature and raise the vaporizing temperature to near the refrigerating temperature. The suction pressure becomes high, the refrigerant circulation amount of the capacity control compressor 6 becomes 2-3 times as high as the evaporation temperature at the time of cooling in the freezer compartment −30 ° C., and the refrigerating capacity increases.

At this time, the capacity control compressor 6 performs capacity control, operates at 20 Hz, which is about 1/3 of the time when the freezer compartment 2 is cooled, and reduces the refrigerant circulation amount to 3: 1.

When the capacity control compressor 6 controls the capacity at the same time as the pressure reduction amount of the pressure reducing means 13 is switched, the evaporation temperature rises and the suction pressure rises when the refrigerating chamber 3 is cooled. The operation of the machine 6 can be performed at a low compression ratio operation, and it can be operated efficiently.

As described above, since the refrigerating compartment 3 is operated in the high evaporation temperature range during cooling, the operating efficiency through the normal cooling operation in the freezing compartment 2 and the refrigerating compartment 3 is improved.

Further, even when the evaporator 7 is frosted and defrosted, the evaporation temperature is raised during the cooling of the refrigerating chamber 3 to operate, so that the amount of frost adhering to the evaporator 7 can be reduced and the evaporator 7 can be regularly operated. The defrosting heater 8 can reduce the amount of frost even during defrosting.
Since the heating time for energizing the product is shortened and the temperature rise in the refrigerator due to defrosting is reduced, the temperature rise of the temporarily stored food can be suppressed to a low level, and the shortening of the freshness retention period of the food can be prevented.

Further, the condenser fan 1 whose rotation speed can be changed
6 and the evaporator fan 17 are installed (see FIG. 5), and when the temperature rising gradient of the refrigerating compartment 2 becomes larger than the preset temperature rising gradient, the refrigerating damper 5a of the refrigerating compartment 3 is
It is also possible to operate by increasing the rotation speed of the condenser fan 16 and the evaporator fan 17 by increasing only the capacity of the capacity control compressor 6 beyond the capacity at the time of the normal cooling operation of the refrigerating room 3 by opening only. (See FIG. 6).

For example, when a large amount of food enters only the refrigerating compartment 3 and the temperature of the refrigerating compartment 3 rapidly rises, temperature information is input to the system control means 10 from the refrigerating temperature sensor 5 of the refrigerating compartment 3 and the temperature input value. When the gradient is equal to or higher than the preset temperature gradient, the decompression amount of the decompression means 13 is switched to raise the evaporation temperature of the evaporator 7 to near the refrigerating room temperature.

In this case, the capacity control compressor 6 is operated at a frequency of 40 Hz, which is twice the normal cooling operation, to double the refrigerant circulation amount, and the variable condenser fan 16 increases the rotation speed. As a result, the condenser 12 has an increased condensing capacity corresponding to the increased refrigerant circulation amount, and at the same time, the rotation speed of the evaporator fan 17 is also increased, so that the refrigerating capacity doubled can be effectively drawn out. Is possible,
The load can be quickly cooled as the amount of food in the refrigerating room increases.

Further, only when the temperature rising gradient of the freezing compartment 2 becomes larger than the preset temperature rising gradient, only the open / close refrigeration damper 4a of the freezing compartment 2 is opened, and the capacity higher than that of the normal cooling operation of the freezing compartment 2 is reached. The control compressor 6 can increase the capacity, and can also increase the rotation speeds of the condenser fan 16 and the evaporator fan 17 whose rotation speeds can be varied (see FIG. 7).

For example, when a large amount of food enters only the freezing compartment 2 and the temperature of the freezing compartment 2 rises rapidly, the freezing temperature sensor 4 of the freezing compartment 2 inputs temperature information to the system control means 10. When the gradient of the temperature input value is equal to or higher than the preset temperature rise gradient, the pressure reducing means 13 causes the evaporator 7
The evaporation temperature is set to about -30 ° C.

In this case, the capacity control compressor 6 is operated with the maximum control width of 100 Hz, and the refrigerant circulation amount is 1.
By increasing the number of revolutions of the condenser fan 16 by about 5 times, the condensing capacity corresponding to the increased refrigerant circulation amount is increased, and at the same time, the number of revolutions of the evaporator fan 17 is also increased by 1.5 times. The refrigerating capacity increased to some extent can be effectively brought out, and the load can be quickly cooled against the increase in the food in the freezer compartment 2.

Further, a quenching switch is provided, and when this quenching switch is turned on, only the refrigerating damper 5a of the refrigerating compartment 3 is opened, and the capacity control compressor 6 has a capacity higher than the capacity during the normal cooling operation of the refrigerating compartment 3. It is also possible to increase the number of rotations of the condenser fan 16 and the evaporator fan 17 whose number of rotations can be increased (see FIG. 8).

At this time, for example, by the signal of the system control means 10, the capacity control compressor 6 is operated at a frequency of 40 to 60 Hz which is 2 to 3 times that of the normal cooling operation, and the refrigerant circulation amount is about 2 to 3 times. By increasing the number of rotations of the condenser fan 16, the condensing capacity corresponding to the increased amount of refrigerant circulation is increased, and at the same time, the number of rotations of the evaporator fan 17 is also increased to increase the number of times by 2 to 3 times. It becomes possible to effectively bring out the refrigerating capacity, and when it is desired to quickly cool a food or beverage that has been arbitrarily placed, it is possible to efficiently cool it at a cooling rate that is 2 to 3 times that of the conventional case.

Further, during the cooling operation of the refrigerating compartment 3, the rotation speed of only the evaporator fan 17 is reduced so that the air volume becomes smaller than the cool air volume at the time of cooling the freezing compartment 2 so that the cold air velocity directly hits the food stored in the refrigerating compartment. Can also be reduced (Fig. 9
reference).

In this case, by reducing the cold air velocity that directly hits the stored food, it is possible to prevent the food from drying and to maintain the freshness of the food for a longer period of time.

[0063]

As described above, the present invention provides a cooling system in which a capacity control compressor capable of controlling the refrigerating capacity, a condenser, a pressure reducing means, an evaporator, and a suction line are sequentially joined, and the cooling system. In the system, a condenser fan that cools the capacity control compressor and the condenser, an evaporator room in which the evaporator fan, a cooler fan provided in the vicinity of the evaporator, and a defrost heater are arranged, a freezing room, and a refrigerating room are provided. A refrigerator box provided, a temperature sensor for detecting the room temperature of the refrigerating room and the freezing room, a cooling duct communicating with each of the evaporator room, the freezing room and the refrigerating room, a cooling duct for each of the refrigerating room and the freezing room And a damper for opening and closing the cold air outlet, and a system control for controlling the capacity control compressor, the condenser fan, the cooler fan and the damper by a signal from the temperature sensor. Means, and while opening and closing the damper of each chamber during the operation of the capacity control compressor, comprises a decompression means for changing the evaporation temperature of the evaporator when cooling each chamber, during normal cooling operation of the refrigerating room, Since the refrigerating capacity of the capacity control compressor is reduced as compared with the cooling operation of the freezing compartment, the freezing compartment and the refrigerating compartment can be independently cooled during the operation of the compressor.

At the same time, when the refrigerating chamber is cooled, the evaporation temperature is raised, so that the compressor can be operated with high efficiency and energy can be saved.

Further, since the amount of frost on the evaporator is reduced and the defrosting time is shortened, it is possible to save energy during defrosting.

Only when the temperature rise gradient of the refrigerating compartment becomes larger than the preset temperature rise gradient, only the damper of the refrigerating compartment is opened, and the capacity of the capacity control compressor exceeds the capacity during the normal cooling operation of the refrigerating compartment. Since the number of revolutions is increased by using a condenser fan and a cooler fan that can change the number of revolutions, it is possible to quickly respond to a sudden rise in temperature of the refrigerating compartment due to replacement of food in the refrigerating compartment,
Since the food can be cooled and the temperature rise of the food can be suppressed, the food can retain freshness more than ever before.

Only when the temperature rising gradient of the freezing compartment becomes larger than the preset temperature rising gradient, only the damper of the freezing compartment is opened, and the capacity of the capacity control compressor exceeds the capacity during the normal cooling operation of the freezing compartment. The temperature of the condenser fan and the cooling fan that can change the rotation speed are increased, so that it is possible to quickly respond to sudden temperature rises in the freezer compartment due to the replacement of food in the freezer compartment and to cool the food. Since the food can be frozen at home freezing quickly and the temperature rise of the food can be suppressed, the food can be kept fresher than ever.

Further, a rapid cooling switch is provided, and when the rapid cooling switch is turned on, only the damper in the refrigerating compartment is opened to increase the capacity of the capacity control compressor beyond the capacity in the normal cooling operation of the refrigerating compartment to increase the rotation speed. The number of rotations of the variable condenser fan and cooler fan is increased, and food or beverage (beer, drinking water) put in the refrigerating room can be quickly cooled at any time.

Further, during the cooling operation of the refrigerating compartment, the number of rotations of the evaporator fan is reduced so that the air volume is smaller than that of the cooling air when cooling the freezing compartment, and the cold air velocity directly hitting the stored food in the refrigerating compartment is reduced. By reducing the cold air velocity that directly hits the stored food, it is possible to prevent the food from drying,
The freshness of the food can be maintained for a long time.

[Brief description of drawings]

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

[Fig. 2] Cooling system diagram of the refrigerator-freezer

FIG. 3 is a timing chart of the refrigerator / freezer.

FIG. 4 is a Mollier diagram of the operation cycle of the refrigerator-freezer.

[Fig. 5] Another cooling system diagram of the refrigerator-freezer.

FIG. 6 is another timing chart of the refrigerator-freezer.

FIG. 7 is another timing chart of the refrigerator-freezer.

FIG. 8 is another timing chart of the refrigerator-freezer.

FIG. 9 is another timing chart of the refrigerator-freezer.

FIG. 10 is a schematic sectional view of a conventional refrigerator-freezer.

[Explanation of symbols]

 2 Freezing room 2a, 3a Cold air outlet 3 Refrigerating room 4 Freezing temperature sensor 4a Freezing damper 5 Refrigeration temperature sensor 5a Refrigeration damper 6 Capacity control compressor 7 Evaporator 9,17 Evaporator fan 10 System control means 11 Cooling duct 12 Condenser 12a, 16 condenser fan 13 decompression means 15 cooling system

Claims (5)

[Claims] 1. A capacity control compressor capable of controlling refrigeration capacity, a cooling system having a condenser and an evaporator, a condenser fan cooling the capacity control compressor and the condenser, and the evaporator and cooler fan. , A temperature sensor for detecting the room temperature of the freezer compartment and the refrigerator compartment, a cooling duct provided with a cool air outlet communicating with the freezer compartment and the refrigerator compartment, and dampers for opening and closing the cool air outlet. And system control means for controlling the capacity control compressor, the condenser fan, the cooler fan, and the damper by the signal of the temperature sensor, and alternately opening and closing the damper while the capacity control compressor is in operation. And a pressure reducing means for changing the evaporation temperature of the evaporator at the time of cooling, and when the refrigerating chamber is normally cooled, the freezing chamber is cooled. Refrigerator / refrigerator that reduces the refrigeration capacity of the capacity control compressor compared to when it is used. 2. A condenser fan and an evaporator fan whose rotation speed can be changed are installed, and a damper of a cool air outlet communicating with the refrigerating compartment is opened only when the temperature of the refrigerating compartment rises above a preset temperature. 2. The refrigerator / freezer according to claim 1, wherein the capacity of the capacity control compressor is increased more than the capacity at the time of performing the normal cooling operation of the refrigerating room to increase the rotational speeds of the condenser fan and the cooler fan. 3. A condenser fan and an evaporator fan whose rotation speed can be changed are installed, and a damper of a cold air outlet communicating with the freezing compartment is opened only when the temperature of the freezing compartment rises above a preset temperature. 2. The refrigerator / freezer according to claim 1, wherein the capacity of the capacity control compressor is increased more than the capacity at the time of performing the normal cooling operation of the freezer compartment to increase the rotation speeds of the condenser fan and the cooler fan. 4. A condenser fan and an evaporator fan whose rotation speed can be changed are installed, a quenching switch is provided, and when the quenching switch is turned on, a damper of a cold air outlet communicating with the refrigerating room is opened to open the refrigerating room. The rotational speed of the condenser fan and the cooler fan is increased by increasing the capacity of the capacity control compressor more than the capacity during normal cooling operation of the compressor.
A refrigerator as described. 5. The refrigerator / freezer according to claim 1, wherein the number of rotations of the cooler fan is reduced when the refrigerating compartment is normally cooled.