JP3484131B2 - Freezer refrigerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator / freezer which is less likely to adversely affect the global environment such as ozone layer depletion and global warming.

[0002]

2. Description of the Related Art At present, Freon refrigerants are mainly used as refrigerants for refrigerators and freezers. CF among fluorocarbon refrigerants
When the C-based and HCFC-based refrigerants are released to the atmosphere, they destroy the ozone layer, and therefore the transfer to the HFC-based refrigerants is being promoted. R13, which is an HFC refrigerant in household refrigerators
4a is widely used.

22 to 24 show, for example, Japanese Patent Laid-Open No. 8-285.
It is a side sectional view, a refrigerant circuit block diagram, and a control timing chart figure of the conventional household refrigerator shown in JP440. In the figure, 1 is a compressor, 2 is a condenser, 3 is a capillary that is a throttle device, 4 is an evaporator, 5 is a header that stores excess refrigerant generated when load changes, etc., and these are sequentially connected by piping. Forming a refrigeration cycle.

Further, 6 is an electric heater (hereinafter referred to as an electric heater) installed below the evaporator 4 to melt the frost adhering to the evaporator 4, 7 is a cooling system ON time detecting means, and 8 is defrosting. A timer is for accumulating the operating time of the compressor 1, 10 is an inside temperature detecting means, 11 is an air circulating means, and 12 is an air circulation control of a freezing room which is a cold air circulation control means to the freezing room. Means, 73 is an opening connected to the refrigerating compartment, 14 is a cap provided above the electric heater, 1
Reference numeral 5 is a freezing compartment, 16 is a refrigerating compartment, 18 is a refrigerating compartment air outlet, and 44 is a freezing compartment air inlet.

Next, the defrosting operation of the refrigerator using the conventional CFC refrigerant will be described. Freezing room temperature detection means 1
When 0 reaches the preset temperature T1, the compressor 1
To stop. Next, the cooling system ON time (compressor operating time) accumulated by the defrost timer is preset by the cooling system ON time detecting means.
The time (compressor operating time) is compared, and when it is shorter than the set value, the air circulation control means 12 of the freezing compartment is closed, and the air circulation means 11 is continuously energized to continue blowing.

Therefore, the air blown by the air circulation means 11 is controlled by the air circulation control means 12 of the refrigeration chamber 1
5 does not flow into the refrigerator 5, but flows into the refrigerating chamber 16 from the opening 73 through the air return duct 28 in the refrigerator. After cooling the inside of the refrigerator, the temperature of the refrigerator reaches 5 to 7 ° C. and returns to the evaporator 4 from the air intake 18 of the refrigerating room to exchange heat with the evaporator 4 to melt the attached frost.

On the other hand, the cooling system ON time (compressor operating time) accumulated by the defrost timer is compared with the preset cooling system ON time (compressor operating time) in the cooling system ON time detecting means and set. If it is longer than the value, the air circulation control means 12 in the freezer is closed, the air circulation means 11 is stopped and the electric heater 6 for defrosting is energized, and the air heated by the electric heater 6 rises upward by natural convection. , Melt the frost attached to the evaporator 4. By these operations, the frost adhering to the evaporator 4 of the refrigerator-freezer is removed and the refrigerator is operated efficiently.

Further, the HFC-based refrigerant is a substance that promotes global warming when released into the atmosphere, and it has been considered to use a natural refrigerant such as a hydrocarbon-based refrigerant or ammonia that does not deteriorate the global environment as a refrigerant for a refrigerator. ing. As a refrigerator using a natural refrigerant, for example, Japanese Patent Laid-Open No. 8-178
There is one disclosed in Japanese Patent No. 481. As a refrigerant for this refrigerator / freezer, the impact on global warming is very small,
A hydrocarbon-based refrigerant such as propane or butane showing flammability is used.

[0009]

When a flammable refrigerant having a small effect on global warming is used in the conventional refrigerator as described above, first of all, it is the most important issue to secure the safety against flammability, and in the unlikely event that the refrigerant is a refrigerant. It is important to build a system that will not ignite even if a leak occurs.

Further, in order to suppress the global warming, not only the use of a flammable refrigerant having a small influence on the global warming but also the energy efficiency of the refrigerator / freezer,
Improving the defrosting method using an electric heater is also an important issue.

The present invention has been made in order to solve the above problems, and greatly improves the safety and further improves the efficiency of a refrigerating refrigerator using a refrigerant having a very small adverse effect on the global environment. The purpose is to get a freezer refrigerator.

[0012]

A refrigerating refrigerator according to the present invention comprises a refrigerating cycle in which a compressor, a condenser, a throttle device and an evaporator are sequentially connected by a refrigerant pipe, and a refrigerating compartment temperature provided in a refrigerating compartment. The air temperature from the evaporator to the refrigerating room is circulated to the refrigerating room by comparing the temperature inside the refrigerating room detected by the detecting means, the freezing room temperature detecting means provided in the freezing room, and the refrigerating room temperature detecting means with the set value. The air circulation control means of the refrigerating room controlling the temperature of the refrigerating room and the freezing room temperature detected by the freezing room temperature detecting means and the set value are compared to control the circulation of the air from the evaporator to the freezing room. Air circulation control means, a refrigerating room,
An air circulation means for circulating the air from the evaporator to the freezer compartment or the like, the air circulation control means of the freezer compartment being able to convey air to the freezer compartment or the air circulation control means of the refrigerating compartment When the air can be transported, the air circulation means is driven , the compressor stops, and the air in the freezer compartment
The circulation control means cannot convey air to the freezer.
If the temperature in the refrigerator compartment exceeds the set value,
The air circulation control means in the storage compartment can transfer air to the refrigerator compartment.
It is characterized by being controlled to a state.

[0013]

[0014] In addition, the refrigerator according to the present invention, cold
Table of the electric heater when freeze using refrigerant flammable refrigerant cycle, as an electric heater for defrosting the evaporator, and energized
An electric heater with a capacity that keeps the surface temperature below the ignition temperature of the flammable refrigerant.
Comprises a chromatography data, and controls so as to energize the electric heater when the compressor integrated operating time is longer than the set value.

[0015] In addition, the refrigerator according to the present invention, coagulation
It is possible to close the flow of refrigerant between the compressor and the expansion device.
Shut-off valve is installed, and the output of the freezer temperature detection means is preset.
When the pressure falls below the specified value, shut off the shutoff valve and
Control the compressor so that it stops after a set time.
Is characterized by.

[0016]

[0017] refrigerator according to the present invention, a compressor, a condenser, and connecting the flow path switching valve sequentially by refrigerant pipes, the flow path 2 is connected a throttle device in the switching valve in parallel, one aperture instrumentation
One evaporator is connected to the storage unit, and the defrost valve is attached to the other expansion device.
Connect the other evaporator via the outlet of one evaporator and the front
A refrigeration cycle in which a bypass flow path from the compressor is connected to a defrost valve, and a refrigerating compartment temperature detecting means provided in the refrigerating compartment.
And a freezer compartment temperature detecting means provided in the freezer compartment, a refrigerating compartment air circulating means for circulating air from one evaporator to the refrigerating compartment, and a freezing compartment for circulating air from the other evaporator to the freezer compartment. Air circulation means, and the flow path switching valve is refrigerated room temperature
Temperature detected by the temperature detection means is lower than the set value.
Switch the flow path to the other throttle device
After that, switch to one diaphragm device after a predetermined time,
Evaporate one side by operating the refrigerating room air circulation means for a predetermined time
Defrost the compressor and make the accumulated operating time of the compressor more than the set value.
If it becomes large, defrost the valve to bypass the bypass flow path and the other side.
Switch to the flow path to which the inlet of the generator is connected and switch the other evaporator
It is characterized by defrosting .

Further, the squeezing device is a capillary tube.

Further, the throttle device and the flow path switching valve are flow rate control valves whose opening can be continuously adjusted.

Further, in the refrigerator-freezer according to the present invention, the compressor, the condenser, and the first flow path switching valve are sequentially connected by the refrigerant pipe, and two expansion devices are connected in parallel to the first flow path switching valve. and connecting the first, second evaporator to the respective throttle device, first
At the outlets of the 1st and 2nd evaporators, the 3rd and 4th passages are cut off respectively.
A switching valve is connected, and the inlet of the second evaporator is connected to the third flow path switching valve.
Of the first connecting pipe and the second expansion device connected to the
Connect to the second bypass channel connected to the inlet side, and
Second connection pipe for connecting the passage selector valve to the inlet of the first evaporator
And a third expansion device, and a refrigeration cycle in which the pipes from the defrost valve to which the first bypass flow path from the compressor is connected are connected to the inlets of the first and second evaporators , Refrigerating room temperature detecting means provided in the refrigerating room, freezing room temperature detecting means provided in the freezing room, refrigerating room air circulating means for circulating air from one evaporator to the refrigerating room, and the other to the freezing room A freezer air circulation means for circulating the air from the evaporator of
When defrosting the first evaporator, close the first flow path switching valve to defrost
The valve connects the first bypass channel and the inlet of the first evaporator.
The first evaporator is the condenser and the second evaporator is the evaporator.
The first flow during defrosting of the second evaporator.
The path switching valve is closed, and the defrost valve is used to connect the first bypass passage and the second bypass passage.
The second evaporator is connected to the condenser, and the first evaporator is connected to the first evaporator.
Characterized by forming a cycle in which the
And

A flammable refrigerant is used in the refrigeration cycle.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 to 6 are views showing a first embodiment, FIG. 1 is a side sectional view of a refrigerator-freezer, FIG. 2 is a refrigerant circuit diagram of the refrigerator-freezer, FIG. 3 is a control timing chart diagram of the refrigerator-freezer, and FIG. 4 is a refrigerator-freezer. Of FIG. 5 is a diagram showing the flow of air in the refrigerator when simultaneously cooling the refrigerator compartment, the vegetable compartment, and the freezer compartment. FIG. 5 is a diagram showing the flow of air in the refrigerator when cooling only the freezer compartment of the refrigerator-freezer. It is a figure showing the flow of the air in a refrigerator at the time of defrosting of a freezer.

As the refrigerant of this refrigeration cycle, a hydrocarbon refrigerant R600a which has a very small effect on global warming is used. In the figure, 1 is a compressor, 2 is a condenser, 3 is a capillary that is a throttle device, 4 is an evaporator, 5 is a header that stores excess refrigerant generated when load changes, etc., and these are sequentially connected by piping. Forming a refrigeration cycle.

Reference numeral 15 is a freezing compartment, 16 is a refrigerating compartment, 20 is a vegetable compartment, 10 is a freezer compartment internal temperature detecting means, 21 is a refrigerating compartment internal temperature detecting means, 4 is an evaporator, 11 is an air circulating means, 12
Is an air circulation control means for the freezing compartment which is a cooling air circulation control means for the freezing compartment, 13 is an air circulation control means for the refrigeration compartment which is a cooling air circulation control means for the refrigeration compartment, 19 is a refrigeration compartment air duct, 1
8a to 18d are air outlets for the refrigerating room, and 25a and 25b.
Is a refrigerator compartment air inlet, 26a to 26c are vegetable compartment air outlets, 27a and 27b are vegetable compartment air inlets, 28
Is an internal air return duct from the vegetable compartment to the evaporator, 4
Reference numeral 4 is an air inlet of the freezer.

In the air circulation control means 13 of the refrigerating compartment, the refrigerating compartment internal temperature detected by the refrigerating compartment internal temperature detecting means 21 installed in the refrigerating compartment is higher than a preset value stored in the controller 23 in advance. If opened, refrigerating room 16
The air from the evaporator 4 can be introduced into. On the other hand, when the temperature is lower than the set value, the air circulation control means 13 of the refrigerating compartment is closed and the introduction of air from the evaporator 4 to the refrigerating compartment 16 is shut off.

Similarly to the air circulation control means 13 of the refrigerating room, the air circulation control means 12 of the freezing room is the temperature inside the freezing compartment detected by the temperature detecting means 10 inside the freezing compartment installed in the freezing room in advance. It is opened when it is higher than the set value stored in the controller 23, and the air from the evaporator 4 can be introduced into the freezer compartment 15. On the other hand, when the temperature is lower than the set value, the air circulation control means 12 of the freezing compartment is closed to shut off the introduction of air from the evaporator 4 into the freezing compartment 15.

The compressor 1 is operated and set when the inside temperature detected by the inside-freezer temperature detecting means 10 installed in the inside of the freezer becomes higher than the set value stored in the controller 23. When it is less than the value, stop.

The air circulation means 11 is energized and operated when either the air circulation control means 12 of the freezing compartment or the air circulation control means 13 of the refrigerating compartment is opened, and the air circulation control means 12 of the freezing compartment and the refrigeration Room air circulation control means 1
Stop if both 3 are closed.

The operation of the refrigerator configured and controlled as described above and the flow of air in the refrigerator will be described with reference to FIGS. At a certain time t0, the compressor 1 and the air circulation means 1
1 is in operation, the air circulation control means 12 for the freezing compartment and the air circulation control means 13 for the refrigerating compartment are open, and both the refrigerating compartment 15 and the freezing compartment 16 are cooled. During that time, frost is attached and grown on the evaporator 4.

The flow of air in the refrigerator is shown in FIG. Regarding the flow of air in the refrigerator, the air blown out from the air circulating means 11 is divided into a refrigerating room 16 and a freezing room 15. The air that has passed through the air circulation control means 13 of the refrigerating compartment passes while cooling the duct 19 for the refrigerating compartment, and the air outlet 18 of the refrigerating compartment is blown out.
It blows off from a, 18b, 18c, 18d to the refrigerating room 15 at about -20 degreeC. The blown air is 3-5 in the refrigerator compartment 15.
Refrigerating chamber suction ports 25a, 25b while cooling to about ℃
To the vegetable compartment 20 through the vegetable compartment outlets 26a, 26b, 26c.

Further, the vegetable compartment 20 is cooled to about 5 to 7 ° C., and passed through an internal air return duct 28 to the evaporator 4 for 5 minutes.
It flows into the evaporator 4 at a temperature of about 7 ° C. Moisture in the air is taken by the evaporator 4 while exchanging heat with the evaporator 4 at about −30 ° C., and becomes air at about −27 ° C. and is blown out from the evaporator 4 again.

On the other hand, the air that has passed through the air circulation control means 12 of the freezing room is blown into the freezing room 15 at about -30 ° C. to cool the freezing room 15, and the freezing room air suction port 44 at the lower part of the freezing room.
From about −20 ° C. into the evaporator 4.

At time t1, since the temperature detected by the refrigerating compartment internal temperature detecting means 21 installed in the refrigerating compartment 16 becomes lower than the preset value stored in the controller 23 in advance, the air in the refrigerating compartment is reduced. The circulation control means 13 is closed, but the other states remain unchanged. As shown in FIG. 5, the flow of air in the refrigerator is only blown to the freezing compartment 15.

At time t2, the temperature detected by the temperature detecting means 10 in the freezer compartment installed in the freezer compartment 15 becomes lower than the preset value stored in the controller 23, so that the air in the freezer compartment is cooled. The circulation control means 12 is closed and the compressor 1 is also stopped. On the other hand, the air circulation control means 13 of the refrigerating compartment opens the air circulation control means 13 of the refrigerating compartment from the evaporator 4 for the refrigerating compartment because the temperature of the refrigerating compartment becomes higher than the preset value stored in the controller 23 in advance. The duct 19 is communicated. The air from the vegetable compartment 20 is 5
Since the temperature is -7 ° C, heat is exchanged with the evaporator 4 while melting the frost attached to the evaporator 4. The blowing temperature to the refrigerating room 16 is-
The air is sufficiently moistened at about 5 ° C. to 0 ° C., and does not heat the refrigerating chamber 16.

At time t3, the temperature detected by the freezer compartment internal temperature detecting means 10 installed in the freezer compartment 15 becomes higher than the preset value stored in the controller 23. The circulation control means 12 is opened and the compressor 1 is operated. On the other hand, the air circulation control means 13 of the refrigerating compartment is closed because the air circulation control means 13 of the refrigerating compartment is lower than the preset temperature of the refrigerating compartment stored in the controller 23. The flow of air in the refrigerator is again as shown in FIG. 5, and only the freezing compartment 15 is cooled.

At time t4, the temperature detected by the freezer compartment internal temperature detecting means 10 installed in the freezer compartment 15 becomes lower than the preset value stored in the controller 23, so that the air in the freezer compartment is cooled. The circulation control means 12 is closed and the compressor 1 is stopped. On the other hand, since the air circulation control means 13 of the refrigerating room continues to be in a state of being lower than the refrigerating room set temperature stored in the controller 23, the closed state is continued. The air circulation means 11 detects that the air circulation control means 13 in the refrigerating room and the air circulation control means 12 in the freezing room are closed and stops.

As described above, the air circulation control means 1 for the refrigerating compartment
3. In order to control the air circulation control means 12 and the air circulation means 11 of the freezer compartment, the refrigerating compartment 16 is cooled by the heat capacity (frost, copper pipes, aluminum fins, refrigerant) of the evaporator 4 while the compressor 1 is stopped, If the heat capacity of the evaporator 4 is insufficient, the compressor 1
Will be cooled by. Further, the freezer compartment 15 is cooled during the operation of the compressor.

In a conventional refrigerator using a freon-based refrigerant such as R134a, the timing of defrosting is judged by the cumulative operating time of the compressor and the like, and compared with the case where defrosting is performed by an electric heater. As described above, if defrosting is performed using the air inside the refrigerator compartment 16 and the vegetable compartment 20 as a heat source, the refrigerator compartment will not be overloaded.

Further, when R600a, which is a flammable refrigerant, is used, assuming that the refrigerant leaks into the refrigerator, the conventional electric heater capacity may be an ignition source and is dangerous. However, in the present embodiment, since the air in the refrigerator is used as a heat source for melting frost, even if refrigerant leaks into the refrigerator, there is no electric heater and there is no possibility of ignition.

Further, by melting the frost of the evaporator 4, the temperature of the refrigerating compartment 16 can be adjusted, and the humidity can be kept high, so that the food can be preserved with good freshness.

In this embodiment, the example in which the capillary tube 3 is used as the diaphragm device has been described, but the invention is not limited to this.
An electronic expansion valve whose opening can be arbitrarily adjusted by an electric signal may be used.

Embodiment 2. Embodiment 2 of the present invention will be described below with reference to the drawings. 7 and 8 are views showing the second embodiment, FIG. 7 is a side sectional view of a refrigerator-freezer, and FIG. 8 is a control timing chart diagram of the refrigerator-freezer. The refrigerant circuit configuration is the same as that of FIG. 2 described in the first embodiment. In the figure, 1 is a compressor, 2 is a condenser, 3 is a capillary tube which is a throttle device, 4 is an evaporator, 5 is a header for storing excess refrigerant generated when the load fluctuates, and these are sequentially connected by piping. Forming a refrigeration cycle. As the refrigerant for this refrigeration cycle, a hydrocarbon-based refrigerant R600a that has a very small effect on global warming is used.

Reference numeral 15 is a freezing compartment, 16 is a refrigerating compartment, 20 is a vegetable compartment, 10 is a freezing compartment internal temperature detecting means, 21 is a refrigerating compartment internal temperature detecting means, 4 is an evaporator, 11 is an air circulating means, 12
Is an air circulation control means for the freezing compartment which is a cooling air circulation control means for the freezing compartment, 13 is an air circulation control means for the refrigeration compartment which is a cooling air circulation control means for the refrigeration compartment, 19 is a refrigeration compartment air duct, 1
8a to 18d are air outlets for the refrigerating room, and 25a and 25b.
Is a refrigerator compartment air inlet, 26a to 26c are vegetable compartment air outlets, 27a and 27b are vegetable compartment air inlets, 28
Is an internal air return duct from the vegetable compartment to the evaporator, 4
Reference numeral 4 is an air inlet of the freezer.

The air circulation control means 13 of the refrigerating compartment is the refrigerating compartment 1
6 is opened when the temperature inside the refrigerating compartment detected by the refrigerating compartment inside temperature detecting means 21 installed in 6 is higher than a preset value stored in the controller 23 in advance.
The air from the evaporator 4 can be introduced into. On the other hand, when the temperature is lower than the set value, the air circulation control means 13 in the refrigerating compartment is closed to shut off the introduction of air from the evaporator 4 into the refrigerating compartment 16. Further, when the controller 23 detects the stop of the compressor 1, the air circulation control means 13 in the refrigerating room controls so as to be opened.

The air circulation means 11 is energized and operated when either the air circulation control means 12 of the freezing compartment or the air circulation control means 13 of the refrigerating compartment is opened, and the air circulation control means 12 of the freezing compartment and the refrigerating compartment Air circulation control means 13
Will stop if both are closed.

Air circulation control means 12 in the freezer compartment, compressor 1
Is controlled in the same manner as in the first embodiment, and therefore its explanation is omitted.

The operation of the refrigerator configured and controlled as above will be described with reference to the timing chart of FIG. At time t4, the temperature detected by the freezer compartment internal temperature detecting means 10 installed in the freezer compartment becomes lower than the preset value stored in the controller 23 in advance, so that the air circulation control means 12 of the freezer compartment is turned on. Close and stop compressor 1.

On the other hand, although the air circulation control means 13 for the refrigerating room is lower than the preset temperature of the refrigerating room stored in the controller 23, it is detected that the compressor 1 has stopped and the air circulation control means 13 for the refrigerating room is opened. Then, cooling of the refrigerating compartment 16 is started. The air circulation means 11 is continuously operated as it is.

In the present embodiment, when the compressor 1 is stopped, the operation to melt the frost is always performed, so that the frost of the evaporator 4 is always maintained in a small capacity, so that the cooling efficiency is excellent and the energy saving operation is realized. . Furthermore, the humidity can be maintained high, and the food can be stored with good freshness.

Embodiment 3. Embodiment 3 of the present invention will be described below with reference to the drawings. 9 and 10 are views showing a third embodiment, and FIG. 9 is a side sectional view of a refrigerator-freezer.
0 is a control timing chart of the refrigerator-freezer.
The refrigerant circuit configuration is the same as that of FIG. 2 described in the first embodiment. In the figure, 1 is a compressor, 2 is a condenser, 3 is a capillary tube which is a throttle device, 4 is an evaporator, 5 is a header for storing excess refrigerant generated when the load fluctuates, and these are sequentially connected by piping. Forming a refrigeration cycle. As the refrigerant for this refrigeration cycle, a hydrocarbon-based refrigerant R600a that has a very small effect on global warming is used.

Reference numeral 15 is a freezing compartment, 16 is a refrigerating compartment, 20 is a vegetable compartment, 10 is a freezing compartment internal temperature detecting means, 21 is a refrigerating compartment internal temperature detecting means, 4 is a freezing compartment evaporator, and 11 is a freezing compartment. Air circulation means, 31 is a refrigerating room evaporator, 32 is a refrigerating room air circulating means, 18a to 18d are refrigerating room air outlets, 2
5a and 25b are air inlets for the refrigerating compartment, 26a to 26c are air outlets for the vegetable compartment, 27a and 27b are air inlets for the vegetable compartment, 28 is an air return duct from the vegetable compartment to the evaporator, and 44 is a freezer. Room air suction port, 45 is a small capacity electric heater, 14 is a bulkhead, 46 is a tray for evaporating drain water generated during defrosting, 47 is a drain water passage pipe, 4
Reference numeral 8 is an evaporator temperature detecting means installed in the evaporator.

The air circulation control means 12 for the freezing compartment, the air circulation control means 13 for the refrigerating compartment, the air circulation means 11 and the compressor 1 are controlled in the same manner as in the first embodiment, and detailed description thereof will be omitted.

When the compressor cumulative operating time becomes longer than the preset compressor cumulative operating time stored in the controller 23, the freezing compartment air circulation control means 12 and the refrigeration compartment air circulation control means 13 are closed. After the compressor 1 and the air circulation means 11 are stopped, energization of the small capacity electric heater 45 is started, and energization is carried out when the temperature preset by the evaporator temperature detecting means 48 installed in the evaporator 4 is reached. It is controlled to finish.

The operation of the refrigerator configured and controlled as described above will be described with reference to the timing chart of FIG. Time t6
In the above, since the compressor integrated operation time stored in advance in the controller 23 becomes larger than the set value, the compressor 1 and the air circulation means 11 are stopped, and the air circulation control means 12 of the freezer compartment and the air circulation means of the refrigerating compartment are stopped. The control means 13 is closed. Further, the controller 23 uses the small capacity electric heater 4
Energization is started to 5.

At time t7, the evaporator temperature detecting means 48 installed in the evaporator 4 exceeds the preset temperature stored in the controller 23 in advance, and the power supply to the small capacity electric heater 45 is terminated. At the same time, both the freezer compartment internal temperature and the refrigerating compartment internal temperature become equal to or higher than the preset values, the compressor 1 and the air circulating means 11 are operated, and the refrigerating compartment air circulation controlling means 13 and the freezing compartment air circulating controlling means 12 are opened. Start the cooling operation.

In this embodiment, since the heat of fusion of frost attached to the evaporator 4 is used for cooling the refrigerating chamber 16, the amount of frost (the amount of frost attached) is smaller than that of the conventional evaporator. . Therefore, the heater capacity when defrosting with the electric heater can be made smaller than the conventional heater capacity.
The surface temperature is lower than the ignition temperature of a.

Further, since it is possible to make it larger than the set value of the conventional compressor integrated operation time and the capacity of the electric heater can be made small, the cooling efficiency is excellent and the energy saving operation is realized. Furthermore, since the cooling is performed by utilizing the heat of fusion of the frost attached to the evaporator, it is possible to maintain the humidity high, and the food can be stored with good freshness. Further, since a small capacity electric heater is used, it is possible to reduce the cost as compared with the electric heater used conventionally.

Fourth Embodiment Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. 11 to 13 are views showing the fourth embodiment, and FIG. 11 is a side sectional view of a refrigerator-freezer.
FIG. 12 is a refrigerant circuit diagram of the refrigerator-freezer, and FIG. 13 is a control timing chart diagram of the refrigerator-freezer. In FIG.
Reference numeral 15 is a freezing room, 16 is a refrigerating room, 20 is a vegetable room, 10 is a freezing room internal temperature detecting means, 21 is a cold room internal temperature detecting means, 4 is an evaporator, 11 is an air circulating means, and 12 is a freezing room. Air circulation control means of the freezing room, which is a cool air circulation control means to
Reference numeral 13 is an air circulation control means for the refrigerating room, which is a means for controlling the cold air to the refrigerating room, 19 is a refrigerating room air duct, and 18a to 18a.
d is a refrigerating room air outlet, 25a and 25b are refrigerating room air inlets, 26a to 26c are vegetable compartment air outlets,
27a and 27b are air inlets for the vegetable compartment, 28 is an air return duct for the air from the vegetable compartment to the evaporator, and 44 is an air inlet for the freezer.

Since the air circulation control means 12 for the freezing compartment, the air circulation control means 13 for the refrigerating compartment, the air circulation means 11 and the compressor 1 are controlled in the same manner as in the first embodiment, detailed description will be omitted.

As the refrigerant of the refrigeration cycle, a hydrocarbon type refrigerant R600a having a very small effect on global warming is used. In FIG. 12, 1 is a compressor, 2 is a condenser, 22 is a shutoff valve capable of closing the flow of the refrigerant according to a command from a controller, 3 is a capillary tube which is a throttle device, 4 is an evaporator,
Reference numeral 5 is a header that stores excess refrigerant generated when the load changes, and these are connected by piping to form a refrigeration cycle.

As soon as the temperature inside the freezer compartment becomes equal to or lower than the set value stored in the controller 23, the shutoff valve 22 shuts off the refrigerant circuit, but the compressor 1 is delayed by the set time stored in the controller 23. It is controlled to stop. Further, as soon as the temperature inside the freezer compartment becomes equal to or higher than the set value stored in the controller 23, the shutoff valve 22
Controls the refrigerant circuit to communicate with each other, and then the compressor 1 is controlled to operate.

The operation of the refrigerator configured and controlled as above will be described with reference to the timing chart of FIG. At t2, the temperature inside the freezer compartment becomes equal to or lower than the set value, the air circulation control means 13 of the freezer compartment is closed, the shutoff valve 22 shuts off the refrigerant circuit, and the compressor 1 is stopped after a set time delay.

On the other hand, the air circulation control means 13 for the refrigerating compartment opens the air circulation control means 13 for the refrigerating compartment from the evaporator 4 because the temperature of the refrigerating compartment has become higher than the preset value stored in the controller 23. The cold room duct 19 is communicated. Since the air from the vegetable compartment 20 has a temperature of 5 to 7 ° C., heat is exchanged with the evaporator 4 while melting the frost attached to the evaporator 4.

Since the compressor 1 is stopped with a delay of a set time after the shutoff valve 22 shuts off the refrigerant circuit, the liquid refrigerant in the evaporator 4 is moved to the condenser 2 so that the heat capacity of the evaporator 4 is the evaporator 4 itself. Since the heat capacity of the frost and the heat capacity of the attached frost are the same, the frost can be melted with less energy than before, and the refrigerator is not loaded at all, and the cooling efficiency is improved.

Embodiment 5. Embodiment 5 of the present invention will be described below with reference to the drawings. 14 to 16 are views showing a fifth embodiment, and FIG. 14 is a side sectional view of a refrigerator-freezer.
15 and 16 are refrigerant circuit diagrams of a refrigerator-freezer. 14
In the figure, 15 is a freezing room, 16 is a refrigerating room, 20 is a vegetable room, 10 is a freezing room internal temperature detecting means, 21 is a freezing room internal temperature detecting means, 74 is a freezing room evaporator, and 61 is freezing room air. Circulating means, 31 is a refrigerator evaporator, 32 is a refrigerator air circulating means, 18 is a refrigerator air outlet, and 25a, 25a.
Reference numeral b is a refrigerating room air intake port, 26a to 26c are vegetable room air blowing ports, and 27a and 27b are vegetable room air intake ports.

The refrigerating compartment air circulation means 32 is provided when the refrigerating compartment interior temperature detected by the refrigerating compartment interior temperature detecting means 21 installed in the refrigerating compartment 16 is higher than a preset value stored in the controller 23 in advance. It is controlled to stop.

The freezer compartment air circulation means 61 is used when the freezer compartment temperature detected by the freezer compartment temperature detection means 10 installed in the freezer compartment 15 is higher than the preset value stored in the controller 23 in advance. Energize and operate. Also,
When it is lower than the set value, it is controlled to stop. Further, the defrost valve 34, which will be described later, is installed in the first bypass passage 3
5 and the inlet pipe of the evaporator 74 for the freezer compartment are switched to a non-energized state and stopped when switched to a flow path connected to the inlet pipe.

In the compressor 1, the temperature inside the freezer compartment detected by the temperature detecting means 10 inside the freezer compartment 15 and the temperature detecting means 21 inside the refrigerating compartment inside the refrigerating compartment 16 are controlled by the controller. It is controlled to operate when the value becomes higher than the set value stored in 23, and to stop when the value becomes lower than the set value. Further, a defrost valve 3 described later
When 4 is switched to the flow path to which the first bypass flow path 35 and the inlet pipe of the freezer compartment evaporator 74 are connected, it is controlled to operate.

As the refrigerant for the refrigeration cycle, the hydrocarbon refrigerant R600a, which has a very small effect on global warming, is used. In FIG. 15, 1 is a compressor, 35 is a first bypass flow path used when frost in the freezer compartment evaporator 74 is melted, 2
Is a condenser, 33 is a first flow path switching valve capable of switching and closing the flow of the refrigerant in response to a command from the controller 23, 3a is a capillary tube which is a refrigerating room expansion device, 3b is a freezing room expansion device , 31 are refrigerator evaporators, 3
Reference numeral 4 denotes a defrost valve capable of switching the flow of the refrigerant in response to a command from the controller 23, 74 denotes a freezer evaporator, and 5 denotes a header that stores excess refrigerant generated when the load fluctuates, and these are connected by piping. It constitutes a refrigeration cycle.

The first flow path switching valve 33 is provided when the inside temperature of the refrigerator detected by the inside temperature detector 21 installed in the refrigerator 16 becomes lower than the set value stored in the controller 23. The flow path is switched to the capillary tube 3b, which is the expansion device for the freezing room, and when it becomes higher than the set value, the controller 2
After a preset time in 3, the flow path is controlled to switch to the capillary tube 3a which is the refrigerating chamber expansion device.
Further, the compressor 1 is controlled so as to close when it stops.

The defrost valve 34 opens the flow path when the inside temperature detected by the inside temperature detecting means 21 of the refrigerating room installed in the refrigerating room becomes lower than the set value stored in the controller 23. Switching to the flow path that connects the capillary tube 3b, which is the expansion device, and the inlet pipe of the freezer compartment evaporator 74, and immediately when it becomes higher than the set value, the outlet pipe of the refrigerator compartment evaporator 31 and the inlet of the freezer compartment evaporator 74 are immediately switched. It is controlled to switch to the flow path that connects the piping.

The set value stored in advance in the controller 23 is compared with the actual integrated operating time of the compressor 1. If the integrated operating time is larger than the set value, the first bypass flow path 3
5 and the inlet pipe of the freezer compartment evaporator 74 are controlled so as to switch to a flow path connected to them.

Further, if the set value stored in advance in the controller 23 and the temperature detected by the evaporator temperature detecting means 54 attached to the header 5 become higher than the set value, the first bypass flow path 35 is formed. It is controlled so that the connection of the inlet pipe of the freezer compartment evaporator 74 is released.

The operation of the refrigerator configured and controlled as described above during the defrosting operation will be described. In the refrigerator of the present embodiment, when the temperature inside the freezer compartment becomes higher than the set value stored in the controller 23, the first flow path switching valve 33 causes the refrigerant flow path to flow after the set time stored in the controller 23. Is connected to the capillary tube 3a which is a refrigerating room squeezing device, the refrigerant does not flow into the refrigerating room evaporator 31 during the set time. Since the refrigerating compartment air circulating means 32 for the refrigerating compartment evaporator 31 is operated according to a command from the controller 23, the air in the refrigerating compartment 16 passes through the vegetable compartment 20 and is supplied to the evaporator 4 as air at 5 to 7 ° C. Pour in. The air and the evaporator 4 exchange heat with each other, so that the frost attached to the evaporator 4 can be melted.

On the other hand, the evaporator 74 for the freezer compartment compares the preset value stored in the controller 23 with the actual cumulative operating time of the compressor 1, and when the cumulative operating time becomes larger than the preset value, 1 Bypass flow path 35 and evaporator 74 for freezer
Is switched to the flow path to which the inlet pipe of the compressor 1 is connected, the high-temperature refrigerant discharged from the compressor 1 flows in, and the evaporator 74 for the freezer compartment
It can be completed in a short time to melt the frost adhering to the refrigerator, and it can be performed with a low input because the refrigeration cycle is used. Since it is heated from the inside of the freezer compartment evaporator 74, the heat load on the refrigerator can be kept very small. You can

Furthermore, when R600a which is a flammable refrigerant is used and the refrigerant leaks into the refrigerator, the electric heater may be an ignition source, which is very dangerous.
However, in the present embodiment, since the air in the refrigerator and the refrigeration cycle (compressor) are used as heat sources, even if refrigerant leaks into the refrigerator, there is no electric heater, so there is a very low possibility of ignition and it is safe. .

Further, the refrigerating compartment 16 is the evaporator 31 for the refrigerating compartment.
It is possible to adjust the temperature of the refrigerating compartment 16 by melting the frost and to keep the humidity high, so that the food can be stored with good freshness.

In the present embodiment, the case where the expansion device is formed of a capillary tube and the first flow path switching valve is used has been described as an example. However, the present invention is not limited to this, and an electric signal as shown in FIG. 16 is used. Two electronic expansion valves each of which can be arbitrarily adjusted in opening degree by means of may be used.

Sixth Embodiment Embodiment 6 of the present invention will be described below with reference to the drawings. 17 to 21 are views showing the sixth embodiment, and FIG. 17 is a side sectional view of a refrigerator-freezer.
FIG. 18 is a refrigerant circuit diagram of a freezer-refrigerator, FIG. 19 is a refrigerant circuit diagram showing a flow of a refrigerant when defrosting a refrigerator compartment evaporator of a freezer-refrigerator, and FIG. 20 is defrosting a freezer compartment evaporator of a refrigerator-freezer. FIG. 21 is a refrigerant circuit diagram showing the flow of the refrigerant in FIG. 21, and FIG. 21 is a refrigerant circuit diagram of the refrigerator-freezer. In FIG. 17, 15 is a freezing room, 16 is a refrigerating room, 20 is a vegetable room, 10 is a freezing room internal temperature detecting means, 21 is a cold room internal temperature detecting means, 74 is a freezing room evaporator, and 61 is a freezing room. Room air circulation means, 31 is a refrigerator compartment evaporator, 32 is a refrigeration room air circulation means, 18 is a refrigeration room air outlet, 25a and 25b are refrigeration room air inlets, 26a to 26c are vegetable compartment air outlets, and 27a. ，
27b is an air inlet for the vegetable compartment.

The refrigerating compartment air circulation means 32 is provided when the refrigerating compartment interior temperature detected by the refrigerating compartment interior temperature detecting means 21 installed in the refrigerating compartment 16 is higher than the preset value stored in the controller 23 in advance. It is controlled to stop.

When the freezer compartment air circulation means 61 has a freezer compartment temperature detected by the freezer compartment temperature detection means 10 installed in the freezer compartment 15 higher than a preset value stored in the controller 23 in advance. Energize and operate. Also,
When it is lower than the set value, it is controlled to stop. Further, the defrost valve 34, which will be described later, is installed in the first bypass passage 3
5 and the inlet pipe of the evaporator 74 for the freezer compartment are switched to a non-energized state and stopped when switched to a flow path connected to the inlet pipe.

In the compressor 1, the temperature inside the freezer compartment detected by the temperature detecting means 10 inside the freezer compartment 15 and the temperature detecting means 21 inside the refrigerating compartment inside the refrigerating compartment 16 are controlled by the controller. It is controlled to operate when the value becomes higher than the set value stored in 23, and to stop when the value becomes lower than the set value. Further, a defrost valve 3 described later
When 4 is switched to the flow path to which the first bypass flow path 35 and the inlet pipe of the freezer compartment evaporator 74 are connected, it is controlled to operate.

Further, in FIG. 18, 36 is a third flow passage switching valve, 37 is a fourth flow passage switching valve, and 38 is a refrigerator compartment evaporator 3.
1 is a first connecting pipe for connecting the freezer compartment evaporator 74 to each other without pressure loss, 39 is a capillary tube as a second expansion device, 40 is a pressure loss between the freezer compartment evaporator 74 and the refrigerating compartment evaporator 31. No. 2 connection pipe connected without connection, 41 is a capillary tube that is a third expansion device, 42 is a second bypass pipe, 50 is a defrost valve 34
And a refrigerating room evaporator 31 inlet pipe connecting the third connecting pipe, and 51 a defrosting valve 34 and a freezing room evaporator 74 inlet pipe connecting the fourth connecting pipe. The refrigerant of this refrigeration cycle is a hydrocarbon-based refrigerant R that has a very small effect on global warming.
600a is used.

The third flow path switching valve 36 is in a state of being connected to the outlet 31 of the refrigerator compartment evaporator 31 and the first connecting pipe 38 during the normal cooling operation. When the frost attached to the refrigerator compartment evaporator 31 is melted, the flow path is controlled so as to connect the outlet of the refrigerator room evaporator 31 and the capillary tube 39 serving as the second expansion device. Further, when the frost attached to the freezer compartment evaporator 4 is melted, the flow path is controlled so as to connect the outlet of the refrigerator room evaporator 31 and the bypass pipe 42.

The fourth flow path switching valve 37 is in a state of being connected to the outlet 74 of the evaporator 74 for the freezer and the header 5 inlet pipe during the normal cooling operation. When the frost attached to the freezer compartment evaporator 74 is melted, the flow path is controlled so as to connect the outlet of the freezer compartment evaporator 74 and the capillary 41 as the third expansion device. Further, when the frost attached to the refrigerator compartment evaporator 31 is melted, the flow path is controlled so as to connect the outlet of the freezer compartment evaporator 74 and the header 5 inlet pipe.

The operation during the defrosting operation of the refrigerator of the present embodiment configured and controlled as described above will be described first with reference to FIG. 19 in the case of the refrigerator compartment evaporator 31. The first flow path switching valve 33 is closed, and the defrost valve 34 connects the third connection pipe 50 and the first bypass flow path 35. The third flow path switching valve 36 connects the evaporator 31 outlet for the refrigerating compartment and the capillary tube 39 that is the second expansion device, and the fourth flow path switching valve 37 connects the evaporator 74 outlet for the freezing compartment and the header 5 inlet pipe. To do.

Therefore, the high-temperature and high-pressure vapor refrigerant discharged from the compressor 1 is stored in the refrigerator compartment evaporator 31 by the refrigerator compartment evaporator 31.
It is cooled and condensed by the frost attached to the refrigerator 3
The frost adhering to 1 draws heat from the refrigerant and melts. Further, the condensed and liquefied refrigerant passes through the capillary tube 39, which is the second expansion device, is reduced in pressure to become a low-pressure two-phase refrigerant, and flows into the freezer compartment evaporator 74. Therefore, the low-pressure two-phase refrigerant takes heat from the freezer compartment 15 to be evaporated and vaporized, and flows into the compressor 1 via the header 5 as a low-pressure vapor refrigerant.

Next, the case of the freezer compartment evaporator 74 will be described with reference to FIG. The first flow path switching valve is closed, and the defrost valve 34 connects the fourth connection pipe 51 and the first bypass flow path 35. The third flow path switching valve 36 connects the refrigerating compartment evaporator 31 outlet and the second bypass pipe 42, and the fourth flow path switching valve 37 connects the freezing compartment evaporator 74 outlet and the capillary 41 that is the third expansion device. Connecting.

Therefore, the high-temperature high-pressure vapor refrigerant discharged from the compressor 1 is transferred to the freezer compartment evaporator 74 by the freezer compartment evaporator 74.
It is cooled and condensed from the frost adhering to the freezer compartment evaporator 74.
The frost adhering to the heat sinks heat from the refrigerant and melts. Further, the condensed and liquefied refrigerant passes through the capillary 41, which is the third expansion device, is decompressed, becomes a low-pressure two-phase refrigerant, and flows into the refrigerator compartment evaporator 31. Therefore, the low-pressure two-phase refrigerant takes heat from the refrigerating chamber 16 to be evaporated and vaporized, and flows into the compressor 1 via the header 5 as a low-pressure vapor refrigerant.

Since the refrigerant circuit operates as described above during defrosting, the defrosting time of the refrigerator compartment evaporator 31 and the freezing compartment evaporator 74 ends in a short time, and the refrigeration cycle (phase change of the refrigerant). Since it is used, it can be performed with a low input, and since it is heated from inside the evaporator, the heat load on the refrigerator can be suppressed to a very small level. Furthermore, while performing the defrosting operation,
The evaporator that is not defrosted can perform cooling operation and is very energy efficient. Furthermore, the liquid refrigerant does not return to the compressor 1, and the reliability of the compressor 1 can be improved.

When R600a which is a flammable refrigerant is used, assuming that the refrigerant leaks into the refrigerator, the electric heater may be an ignition source and is very dangerous. However, in the present embodiment, since the air in the refrigerator and the refrigeration cycle (compressor) are used as heat sources, even if refrigerant leaks into the refrigerator, there is no electric heater, so there is a very low possibility of ignition and it is safe. .

In the present embodiment, an example in which the capillaries and the first switching valve are used as the expansion device for the freezer compartment and the refrigerator compartment has been described, but the present invention is not limited to this, and as shown in FIG. Two electronic expansion valves each of which can arbitrarily adjust the opening degree by an electric signal may be used.

Further, in the present embodiment, the first connecting pipe 3
8, the case of using the capillary tube 39 and the second connecting pipe 40 which is the second expansion device, and the capillary tube 41 which is the third expansion device has been described, but the present invention is not limited to this, and as shown in FIG. Two electronic expansion valves each of which can arbitrarily adjust the opening degree by an electric signal may be used.

In the first to sixth embodiments, the hydrocarbon refrigerant R600a (isobutane) is used as the refrigerant.
Although the case of using is described, the invention is not limited to this.
It may be a hydrocarbon refrigerant such as R600 (butane) or R290 (propane), a natural refrigerant such as ammonia, or a mixed refrigerant thereof. Also, R134a and R32
It may be an HFC-based CFC refrigerant having a small global warming potential, such as R152a or R152a, or a mixed refrigerant thereof.

Further, although the refrigerating machine oil used in the first to sixth embodiments is not specified, mineral oil, alkylbenzene, ester oil, ether oil, PA
It may be a synthetic oil such as G oil.

Further, although the compressors used in the first to sixth embodiments are not specified,
It may be a reciprocating type, a rotary type, a scroll type, or the like, and may be either a high pressure shell type in which the pressure inside the compressor is kept high or a low pressure shell type in which the pressure inside the compressor is kept low.

Furthermore, although the condensers used in the first to sixth embodiments are not specified,
Either a natural convection type in which a copper pipe embedded in a side wall of a refrigerator and an outer plate are in contact with each other or a forced convection type using a blowing means may be used.

[0098]

The refrigerator / freezer according to the present invention comprises a compressor,
A refrigeration cycle in which a condenser, an expansion device, and an evaporator are sequentially connected by a refrigerant pipe, a refrigerating compartment temperature detecting means provided in the refrigerating compartment, a freezing compartment temperature detecting means provided in the refrigerating compartment, and a refrigerating compartment temperature. The temperature inside the refrigerating compartment detected by the detecting means is compared with the set value, and the air circulation control means of the refrigerating compartment controlling the circulation of the air from the evaporator to the refrigerating compartment and the freezing compartment temperature detecting means are detected. The freezer compartment temperature is compared with the set value, and the air circulation control means of the freezer compartment that controls the circulation of the air from the evaporator to the freezer compartment and the air from the evaporator to the refrigerator compartment, the freezer compartment, etc. And an air circulation means for circulating,
When the air circulation control means of the freezer compartment is in a state where it can convey air to the freezer compartment or the air circulation control means of the refrigerating compartment is in a state where it can convey air to the refrigerating compartment, the air circulation means is driven and the compressor is stopped. In addition, the freezer air circulation control hand
It is impossible to transfer air to the freezer compartment,
If the temperature exceeds the set value, the air circulation in the refrigerator compartment
The ring control means is controlled so that air can be transferred to the refrigerator compartment.
Since that, the power consumption reduction effect is obtained, the effect is obtained that can defrosting without further using an electric heater.

[0099]

[0100] In addition, the refrigerator according to the present invention, cold
Table of the electric heater when freeze using refrigerant flammable refrigerant cycle, as an electric heater for defrosting the evaporator, and energized
An electric heater with a capacity that keeps the surface temperature below the ignition temperature of the flammable refrigerant.
Since the electric heater is controlled to energize when the compressor integrated operating time becomes longer than the set value, the effect of completely removing the frost from the evaporator can be obtained.

[0101] In addition, the refrigerator according to the present invention, coagulation
It is possible to close the flow of refrigerant between the compressor and the expansion device.
Shut-off valve is installed, and the output of the freezer temperature detection means is preset.
When the pressure falls below the specified value, shut off the shutoff valve and
Since the compressor is controlled so as to be stopped after delaying the set time , the evaporator has a small amount of liquid refrigerant, the heat capacity of the evaporator is reduced, the defrost time is shortened, and the power consumption is reduced. The effect is obtained.

[0102]

[0103] Further, refrigerator according to the present invention, a compressor, a condenser, the flow path switching valve is connected with the sequential refrigerant pipe, two connect the throttle device in parallel to the flow path switching valve, one of the aperture instrumentation
One evaporator is connected to the storage unit, and the defrost valve is attached to the other expansion device.
Connect the other evaporator via the outlet of one evaporator and the front
A refrigeration cycle in which a bypass flow path from the compressor is connected to a defrost valve, and a refrigerating compartment temperature detecting means provided in the refrigerating compartment.
And a freezer compartment temperature detecting means provided in the freezer compartment, a refrigerating compartment air circulating means for circulating air from one evaporator to the refrigerating compartment, and a freezing compartment for circulating air from the other evaporator to the freezer compartment. Air circulation means, and the flow path switching valve is refrigerated room temperature
Temperature detected by the temperature detection means is lower than the set value.
Switch the flow path to the other throttle device
After that, switch to one diaphragm device after a predetermined time,
Evaporate one side by operating the refrigerating room air circulation means for a predetermined time
Defrost the compressor and make the accumulated operating time of the compressor more than the set value.
If it becomes large, defrost the valve to bypass the bypass flow path and the other side.
Switch to the flow path to which the inlet of the generator is connected and switch the other evaporator
By performing defrosting, the effect is obtained that can perform a defrosting without using an electric heater. Further, since the phase change of the refrigerant is used for defrosting, the effect of reducing the power consumption can be obtained.

Further, since the diaphragm device is a capillary tube, the effect of suppressing the cost can be obtained. Moreover, there is an effect that the degree of freedom of the installation space is increased.

Further, since the throttle device and the flow path switching valve are flow rate control valves capable of continuously adjusting the opening degree, the evaporator can be operated efficiently and the effect of reducing the power consumption can be obtained.

Further, in the refrigerator / freezer according to the present invention, the compressor, the condenser, and the first flow path switching valve are sequentially connected by the refrigerant pipe, and two throttle devices are connected in parallel to the first flow path switching valve. and connecting the first, second evaporator to the respective throttle device, first
At the outlets of the 1st and 2nd evaporators, the 3rd and 4th passages are cut off respectively.
A switching valve is connected, and the inlet of the second evaporator is connected to the third passage switching valve
Of the first connecting pipe and the second expansion device connected to the
Connect to the second bypass channel connected to the inlet side, and
Second connection pipe for connecting the passage selector valve to the inlet of the first evaporator
And a third expansion device, and a refrigeration cycle in which the pipes from the defrost valve to which the first bypass flow path from the compressor is connected are connected to the inlets of the first and second evaporators , Refrigerating room temperature detecting means provided in the refrigerating room, freezing room temperature detecting means provided in the freezing room, refrigerating room air circulating means for circulating air from one evaporator to the refrigerating room, and the other to the freezing room A freezer air circulation means for circulating the air from the evaporator of
When defrosting the first evaporator, close the first flow path switching valve to defrost
The valve connects the first bypass channel and the inlet of the first evaporator.
The first evaporator is the condenser and the second evaporator is the evaporator.
The first flow during defrosting of the second evaporator.
The path switching valve is closed, and the defrost valve is used to connect the first bypass passage and the second bypass passage.
The second evaporator is connected to the condenser, and the first evaporator is connected to the first evaporator.
By configuring a cycle in which the
Ri, effect that can also be cooled during operation defrosting operation can be obtained. Furthermore, since the waste heat of the refrigeration cycle is used for defrosting, the effect of significantly reducing the power consumption of the refrigerator / freezer can be obtained.

Further, since a flammable refrigerant is used in the refrigeration cycle, it is possible to obtain the effect of less adversely affecting the global environment such as ozone layer depletion and global warming.

[Brief description of drawings]

FIG. 1 shows the first embodiment and is a side sectional view of a refrigerator-freezer.

FIG. 2 shows the first embodiment and is a refrigerant circuit diagram of a refrigerator-freezer.

FIG. 3 shows the first embodiment and is a control timing chart of the refrigerator-freezer.

FIG. 4 shows the first embodiment and is a diagram showing a flow of air in the refrigerator in the case of simultaneously cooling the refrigerating room, the vegetable room, and the freezing room of the freezer-refrigerator.

FIG. 5 is a diagram showing the first embodiment and is a diagram showing a flow of air in the refrigerator when only the freezing compartment of the refrigerator is cooled.

FIG. 6 is a diagram showing the first embodiment and is a diagram showing a flow of air in the refrigerator during defrosting of the refrigerator-freezer.

FIG. 7 shows the second embodiment and is a side sectional view of a refrigerator-freezer.

FIG. 8 shows the second embodiment and is a control timing chart of the refrigerator-freezer.

FIG. 9 is a diagram showing the third embodiment and is a side sectional view of a refrigerator-freezer.

FIG. 10 shows the third embodiment and is a control timing chart of the refrigerator-freezer.

FIG. 11 shows Embodiment 4 and is a side sectional view of a refrigerator-freezer.

FIG. 12 shows Embodiment 4 and is a refrigerant circuit diagram of a refrigerator-freezer.

FIG. 13 shows the fourth embodiment and is a control timing chart of the refrigerator-freezer.

FIG. 14 is a view showing the fifth embodiment and is a side sectional view of a refrigerator-freezer.

FIG. 15 shows the fifth embodiment and is a refrigerant circuit diagram of a refrigerator-freezer.

FIG. 16 is a diagram showing the fifth embodiment and is a refrigerant circuit diagram of a refrigerator-freezer.

FIG. 17 shows Embodiment 6 and is a side sectional view of a refrigerator-freezer.

FIG. 18 shows Embodiment 6 and is a refrigerant circuit diagram of a refrigerator-freezer.

FIG. 19 is a diagram showing the sixth embodiment and is a refrigerant circuit diagram showing the flow of the refrigerant during defrosting of the evaporator for the refrigerating compartment of the refrigerator / freezer.

FIG. 20 is a diagram showing the sixth embodiment and is a refrigerant circuit diagram showing the flow of the refrigerant when defrosting the evaporator for the freezer compartment of the refrigerator / freezer.

FIG. 21 shows Embodiment 6 and is a refrigerant circuit diagram of a refrigerator-freezer.

FIG. 22 is a side sectional view of a conventional refrigerator.

FIG. 23 is a refrigerant circuit diagram of a conventional refrigerator-freezer.

FIG. 24 is a control timing chart of a conventional refrigerator-freezer.

[Explanation of symbols]

1 compressor, 2 condenser, 3 capillary tube, 4 evaporator, 5
Header, 10 Freezing room internal temperature detecting means, 11 Air circulation means, 12 Freezing room air circulation control means, 13
Air circulation control means for refrigerating room, 14 Casa, 15 freezing room, 16 refrigerating room, 17 freezing room air outlet, 18a
-18d Refrigerating room air outlet, 19 Refrigerating room duct, 20 Vegetable room, 21 Refrigerating room temperature detecting means, 2
2 Shut-off valve, 23 Controller, 25a, 25b Refrigerator air inlet, 26a-26c Vegetable room air outlet, 27a, 27b Vegetable room air inlet, 28 Air return duct, 31 Refrigerator evaporator, 32 Refrigerator Room air circulation means, 33 first flow path switching valve, 34 defrost valve,
35 first bypass passage, 36 third passage switching valve, 37
4th flow-path switching valve, 38 1st connection piping, 39 2nd expansion device capillary, 40 2nd connection piping, 41 3rd expansion device capillary, 42 2nd bypass flow path, 43
Third bypass flow passage, 44 Freezer air intake, 45
Small-capacity electric heater, 46 evaporation tray, 47 drain water passage pipe, 48 evaporator temperature detecting means, 50 third connecting pipe, 51 fourth connecting pipe, 61 freezer compartment air circulating means, 63a, 63b electronic as throttle device Expansion valve, 69
Electronic expansion valve that is the second expansion device, 71 Electronic expansion valve that is the third expansion device, 74 Freezer evaporator.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-113092 (JP, A) JP-A-9-189473 (JP, A) JP-A-11-211328 (JP, A) JP-A-7- 248164 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F25D 11/02

Claims (8)

(57) [Claims] 1. A refrigeration cycle in which a compressor, a condenser, a throttle device and an evaporator are sequentially connected by a refrigerant pipe, a refrigerating compartment temperature detecting means provided in the refrigerating compartment, and a freezing compartment provided in the freezing compartment. An air circulation control of the refrigerating compartment, which compares the temperature inside the refrigerating compartment detected by the refrigerating compartment temperature detecting means with a set value, and controls the circulation of air from the evaporator to the refrigerating compartment. Means, comparing the temperature inside the freezer compartment detected by the freezer compartment temperature detection means and a set value, and air circulation control means of the freezer compartment for controlling the circulation of air from the evaporator to the freezer compartment; An air circulation means for circulating the air from the evaporator to the refrigerating compartment, the freezing compartment, etc., wherein the air circulation control means of the refrigerating compartment is capable of transporting air to the freezing compartment or the refrigerating compartment The air circulation control means of the refrigeration When the air can be conveyed to the chamber, the air circulating means is driven and the compressor is stopped.
At the same time, the air circulation control means of the freezer is installed in the freezer.
Air cannot be transported, and the temperature in the
When it becomes larger than the set value, the air circulation control in the refrigerating room
The control means is controlled so that air can be transferred to the refrigerating chamber.
A freezer-refrigerator characterized in that 2. A flammable refrigerant is used as the refrigerant of the refrigeration cycle.
Then, electricity was supplied as an electric heater for defrosting the evaporator.
In this case, the surface temperature of the electric heater is the ignition temperature of the flammable refrigerant.
2. The refrigerator / freezer according to claim 1, further comprising an electric heater having a capacity of less than or equal to 10 degrees, and controlling to energize the electric heater when the compressor cumulative operating time becomes longer than a set value. 3. A refrigerant between the condenser and the expansion device.
The shutoff valve that can close the flow of
When the output of the room temperature detection means falls below a preset value
Shut off the shutoff valve and set the compressor for the set time.
A contract characterized by controlling to delay and stop
The freezer-refrigerator according to claim 1. 4. A compressor, a condenser, and a flow path switching valve are sequentially connected by a refrigerant pipe, two flow path switching valves are connected in parallel with two expansion devices, and one expansion device is connected with one evaporator. , The other diaphragm
Connect the other evaporator via the defrost valve to the
The outlet of the evaporator and the bypass flow path from the compressor are
A refrigeration cycle connected to the defrost valve, a refrigerating compartment temperature detecting means provided in the refrigerating compartment, a freezing compartment temperature detecting means provided in the refrigerating compartment, and air from the one evaporator is circulated to the refrigerating compartment. And a freezing room air circulating means for circulating the air from the other evaporator to the freezing room, the flow path switching valve being detected by the refrigerating room temperature detecting means.
When the temperature of the refrigerating room is lower than the set value, switch the flow path to the other side.
Switch to the squeezing device and if it becomes higher than the set value, it will take a predetermined time
After switching to one diaphragm device later,
While operating the refrigerating compartment air circulation means, the one evaporator
After defrosting, the accumulated operating time of the compressor became larger than the set value.
In this case, the defrosting valve is connected to the bypass passage and the other steam
Switch to the flow path to which the inlet of the generator is connected and evaporate the other
A refrigerator / freezer characterized by defrosting the container . 5. The refrigerator-freezer according to claim 4, wherein the squeezing device is a capillary tube. 6. The refrigerator-freezer according to claim 4 , wherein the expansion device and the flow path switching valve are flow rate control valves capable of continuously adjusting the opening degree. 7. A compressor, a condenser, and a first flow path switching valve are sequentially connected by a refrigerant pipe, and two throttling devices are connected in parallel to the first flow path switching valve, and each throttling device has a first First and second evaporators are connected to the outlets of the first and second evaporators.
The third and fourth flow path switching valves are connected to each other, and the third flow path is connected.
The switching valve has a first connection arrangement connected to the inlet of the second evaporator.
A pipe and a second expansion device, and a first connecting device connected to the suction side of the compressor
2 Bypass flow path is connected to the fourth flow path switching valve
Note Second connecting pipe and third connecting to the inlet of the first evaporator
A refrigeration cycle in which a throttle device is connected and a pipe from a defrost valve in which the first bypass flow path from the compressor is connected to the inlets of the first and second evaporators is connected, and a refrigerating chamber is provided. Refrigerating compartment temperature detecting means, freezing compartment temperature detecting means provided in the freezing compartment, refrigerating compartment air circulating means for circulating air from the one evaporator to the refrigerating compartment, and the other to the freezing compartment A freezer compartment air circulation means for circulating the air from the evaporator; and when the first evaporator is defrosted, the first flow path cutoff
The exchange valve is closed, and the defrost valve connects the first bypass passage
The inlet of the first evaporator is in communication with the first evaporator.
A cycle in which the condenser and the second evaporator serve as an evaporator is constructed.
And when the second evaporator is defrosted, the first flow path switching valve is closed.
The first bypass passage and the second bypass passage by the defrost valve.
And the second evaporator is connected to the condenser,
A cycle in which the first evaporator is an evaporator can be configured.
Refrigerator and refrigerator characterized by. 8. The freezer-refrigerator according to claim 1, wherein a flammable refrigerant is used in the refrigeration cycle.