JPH08285440A - Refrigerator - Google Patents

Abstract

PURPOSE: To change over a defrosting method according to a defrosting load when a cooling system is in an OFF state and reduce power supply to a heater by carrying out defrosting with a heat load in a refrigerating chamber while preventing cold air in a freezing chamber from circulating to operate a cooling fan when a defrosting load is low, and carrying out defrosting with the heater when a defrosting load is high. CONSTITUTION: A cooling system comprises a cold air circulation controlling means 21 for controlling the circulation of cold air to a freezing chamber 18, a cold air blowing means 10 for blowing cold air cooled by an evaporator and a defrosting load detecting means for detecting a defrosting load. In the case where the cooling system is in an OFF state, the inflow of cold air is prevented by the cold air circulation controlling means 21 in the freezing chamber, thereupon the cold air blowing means 10 is operated when a defrosting load detected by the defrosting load detecting means is high, while power is supplied to a defrosting heater 6 when a defrosting load is low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator / freezer, and more particularly to an operation control of a refrigerator / freezer in which an evaporator is heated and defrosted.

[0002]

2. Description of the Related Art FIGS. 10 to 11 show an example of a conventional refrigerator-freezer of this type, which is disclosed in Japanese Utility Model Laid-Open No. 60-65582 and Japanese Patent Laid-Open No. 2-33592. The figure and the principal part schematic diagram of a freezer-refrigerator are shown.

Reference numeral 1 is a refrigerator box, 2 is an evaporator chamber provided in the upper back side of the box, 3 is an evaporator provided in the evaporator chamber 2, and 4 is for supporting the evaporator 3. And a pair of end plates facing each other.

Reference numeral 5 denotes a pair of heat convection guides which are attached to the lower portion of the end plate 4 with their front ends facing inward, and 6 denotes defrosting means (hereinafter referred to as a defrosting heater) arranged below the evaporator 3. 7 is a bulkhead mounted directly above the defrosting heater 6, 8 is a lowermost portion 5 of the evaporator chamber 2, and is a toy for receiving frost-melting water, and 9 is an outlet of the evaporator 3. It is a liquid reservoir tank connected to the side and arranged above the evaporator 3.

Reference numeral 10 denotes a cool air blowing means installed in the upper part of the evaporator chamber 2 for forcibly convection the cool air cooled by heat exchange with the evaporator 3 into the chamber.

A defrosting timer 11 integrates the operating time of the compressor 12 to stop the operation of the compressor 12 at regular intervals, and activates the defrosting heater 6 to control the temperature of the evaporator 3. Is for restarting the compressor 12 after the temperature reaches a predetermined temperature.

Reference numeral 13 is a temperature fuse connected in series to the defrosting heater 6, 14 is an inside temperature detecting means connected in series to the compressor 12 via the defrosting timer 11, 15 is a condenser, 16
Is a decompression device.

The evaporator 3, the sump tank 9 and the compressor 1
2, the condenser 15, and the pressure reducing device 16 are connected in sequence by a refrigerant pipe line to form a refrigeration cycle circuit.

As described above, in the conventional refrigerator-freezer, since the defrost heater 6 is installed below the evaporator 3, a part of the air heated by the defrost heater is located above, that is, the evaporator 3. Natural convection to the lower part occurs, and part of the heated air is guided by the heat convection guide 5 and naturally convection to both sides of the evaporator 3. Further, a part of it convects to the central part of the evaporator 3.

Therefore, the frost adhering to the surfaces of the evaporator 3 and the liquid storage tank 9 is defrosted by exchanging heat with the air which naturally convects upward.

[0011]

However, in the refrigerating refrigerator as described above, the air heated by the defrosting heater 6 is convected to the lower portion of the evaporator 3 and both side portions thereof to raise the temperature of the evaporator 3 and frost. Melt. At this time, in addition to the defrosting, the temperature of peripheral parts and the like is also raised at the same time, and the heat quantity of the defrosting heater 6 is used in addition to the original role of melting the frost, which is extremely inefficient.

Further, since the food temperature in the freezing room rises temporarily due to the heat load generated during defrosting, the quality of the food is likely to deteriorate. Moreover, since the internal temperature of the refrigerator is high after the defrosting ends, the operating time of the compressor 12 after the defrosting ends becomes longer, which leads to an increase in the power consumption.

In the conventional method of defrosting, the defrosting is performed once or twice a day, and the operation of the evaporator 3 is almost always frosted, so that the efficiency of the evaporator 3 is maximized. Since it will continue to be inoperable, it will reduce the cooling capacity of the refrigerator and increase electricity.

As described above, the conventional heater-heating-type defrosting has major drawbacks in terms of both power consumption and food preservation.

The present invention solves the above-described problems of the conventional example. When the defrosting load is small, defrosting is performed by an air heat source in a refrigerator such as a refrigerating room or a vegetable room. By providing defrosting with a defrosting heater when the load is heavy, the frequency of use of the defrosting heater can be reduced, and since the evaporator can be maintained in a state with almost no frost formation, a highly efficient and energy-saving refrigerator / freezer is provided. To do.

Further, since it is possible to reduce a large rise in the temperature of the food in the freezer during defrosting, the temperature of the food in the refrigerator can be kept substantially constant, and the food can be preserved with high quality,
It is a novel freezer-refrigerator that is unprecedented and can be maintained.

[0017]

In order to achieve this object, a refrigerator-freezer of the present invention controls a cooling system which is turned on and off based on an output result of a temperature detecting means in a refrigerator, and a cold air circulation to a freezing compartment. Cooling air circulation control means, cooling air blowing means for sending the cool air cooled by the evaporator, and defrosting load detecting means for detecting the defrosting load.
When the FF is performed and the defrosting load is less than a preset value, the cold air circulation control means of the freezing room prevents the cold air from flowing into the freezing room and drives the cold air blowing means to stop the inside of the refrigerating room. When the defrosting load is larger than a preset value, the defrosting heater defrosts the air by exchanging heat with the evaporator.

Further, a cooling system which is turned on and off based on the output result of the internal temperature detection means, a cold air circulation control means which controls the cold air circulation to the freezing room, and a cool air which is cooled by the evaporator are sent. When the cooling system is off and the evaporator frost amount is less than the preset frost amount, the freezer is composed of a cool air blowing unit and an evaporator frost amount detecting unit that detects the frost amount of the evaporator. The cold air circulation control means prevents the cold air from flowing into the freezing room and drives the cold air blowing means to defrost the air inside the cold storage room by exchanging heat with the evaporator at the time of stop, and When the amount of frost is larger than the set amount, defrosting is performed by the defrosting heater.

Further, a cooling system which is turned on and off based on the output result of the internal temperature detection means, a cold air circulation control means which controls cold air circulation to the freezer compartment, and a cool air which is cooled by the evaporator are sent. Cold air blowing means and cooling system ON
It consists of a cooling system ON time detection means for detecting time, and prevents the cold air from flowing into the freezing room by the cooling air circulation control means of the freezing room only when the cooling system is OFF and the cooling system ON time is shorter than the preset time. In addition, by driving the cool air blowing means, the air inside the refrigerating room is heat-exchanged with the evaporator to defrost when stopped, and when the cooling system ON time is lower than the preset time, the defrost heater defrosts it. It is what makes me.

Further, a cooling system that is turned on and off based on the output result of the internal temperature detection means, a cold air circulation control means that controls the cold air circulation to the freezer compartment, and a cool air that is cooled by the evaporator are sent. It consists of cold air blowing means and outside air temperature detecting means for detecting the outside air temperature, and the cooling system is turned off.
And only when the outside air temperature is included in the preset temperature range, the cold air circulation control means of the freezing room prevents cold air from flowing into the freezing room, and the cold air blowing means is driven to remove the air inside the refrigerating room at the time of stop. Defrosting is performed by exchanging heat with the evaporator, and when the outside air temperature is not within the preset temperature range, defrosting is performed by the defrosting heater.

[0021]

The present invention does not melt the frost in the evaporator by heating the defrosting heater to stop the compressor at regular intervals as in the prior art, but the cooling system is turned off by the above configuration.
If the defrosting load is less than the preset value, the blowout to the freezer is closed and the cool air blower is driven to defrost the air heat source in the refrigerator and the defrosting load is set to the preset value. Defrosting with a defrosting heater when it is larger than that can minimize the use of the defrosting heater as much as possible, and because the evaporator can always be kept in a state with almost no frost, it is a very efficient and energy-saving refrigerator / freezer. provide. Moreover, since the heating of the defrosting heater can be reduced, the temperature rise of the food in the freezer compartment or the refrigerator compartment can be reduced, and high-quality food preservation can be achieved.

When the cooling system is off and the amount of frost formation on the evaporator is less than the amount of frost formation set in advance,
After closing the blowout to the freezer, the cold air blower is driven to defrost the air heat source in the refrigerator, and when the evaporator frost amount is greater than the preset frost amount, the defrost heater defrosts it. By doing so, it is possible to provide a very efficient and energy-saving refrigerator / refrigerator because it is possible to keep the evaporator almost free of frost while using the defrosting heater as little as possible. Moreover, since the heating of the defrosting heater can be reduced, the temperature rise of the food in the freezer compartment or the refrigerator compartment can be reduced, and high-quality food preservation can be achieved.

Further, only when the cooling system is OFF and the cooling system ON time is shorter than a preset time, the blowing to the freezer is closed, the cool air blowing means is driven, and the air heat source in the refrigerator removes the air. When defrosting is performed and the cooling system ON time is longer than the preset time, defrosting is performed by the defrost heater.
The defrosting heater is used as little as possible, and the evaporator can be maintained in a state where there is almost no frost. Moreover,
Since the heating of the defrost heater can be reduced, the temperature rise of the food in the freezer compartment or the refrigerator compartment can be reduced, and high-quality food preservation can be achieved.

Further, only when the cooling system is turned off and the outside air temperature is within the preset temperature range,
After closing the blowout to the freezer, the cold air blower is driven to defrost the air heat source inside the refrigerator, and when the outside air temperature is not within the preset temperature range, the defrost heater defrosts it. As a result, it is possible to provide a very efficient and energy-saving refrigerator / freezer because the evaporator can always be maintained in a state with almost no frost, while using the defrost heater as little as possible. Moreover, since the heating of the defrosting heater can be reduced, the temperature rise of the food in the freezer compartment or the refrigerator compartment can be reduced, and high-quality food preservation can be achieved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A freezer-refrigerator according to an embodiment of the present invention will be described below with reference to the drawings.

The same components as those of the conventional example are designated by the same reference numerals and detailed description thereof will be omitted. Reference numeral 17 denotes a cool air circulation control means installed on the back side of the freezing room 18 above the evaporator chamber 2 and in front of the cool air blowing means 10. The cold air circulation control means has a damper 17a which opens and closes in synchronization with the on / off of the cooling system. In addition, an opening 21 is provided on the side of the cool air blowing means 10 and connected to the refrigerating compartment 20 via a refrigerating compartment duct 19.

A cold air suction port 22 is provided on the bottom of the freezing chamber 18, and a suction port 23 is provided on the upper surface of the refrigerating chamber 20.

Further, a drain guide 24 for receiving water discharged during defrosting and discharging it to the outside of the refrigerator is installed on the back surface of the refrigerator, and an evaporation tray 25 is provided below the discharge port.

A defrost heater 6 is installed below the evaporator 3 as in the conventional case. Reference numeral 30 is a defrosting load detecting means installed on the upper left part of the evaporator 3.

Generally, the defrosting load detecting means 30 is installed at a position where frost is most likely to occur in the evaporator.

The operation of the refrigerator / refrigerator constructed as above will be described. The compressor keeps the refrigerator at a constant temperature by performing a normal operation operation of stopping when the temperature becomes lower and operating when the temperature becomes higher based on the output of the inside temperature detecting means 14. Cold air circulation control means 1 in this normal operation mode
7, the control operation of the temperature and the like of the cool air blowing unit 10 and the evaporator 3 will be described with reference to the timing chart of FIG.

While the compressor 12 is on, the cool air circulation control means 17 is opened by the damper 17a, and the cool air blowing means 10 is on to send the cool air into the refrigerator. As a result, the inside of the refrigerator is cooled and the temperature of the evaporator 3 also decreases with time. Then, at the time T1 when the internal temperature detection means 14 is sufficiently cooled, the compressor 12 is stopped and the damper 17a of the cold air circulation control means 17 is closed. If the value detected by the defrosting load detecting means 30 is smaller than the predetermined amount G1 at this time point, the cool air blowing means 10 continues to blow air while still being energized.

Therefore, the air blown by the cool air blowing means 10 does not flow into the freezer compartment 18 by the damper 17a of the cool air circulation control means 17, but goes into the refrigerating compartment 20 from the side opening 21 through the refrigerating compartment duct 19. Flows in. After cooling the inside of the refrigerator, the temperature of the refrigerator reaches about 5 to 7 ° C., returns from the suction port 23 to the evaporator chamber 2, exchanges heat with the evaporator 3 again, and is then sent to the opening 21 by the cool air blowing means 10. Be done. This operation is repeated.

As a result, the temperature of the evaporator 3 exchanges heat with the air of about 5 to 7 ° C., and the temperature rises rapidly.
Then, the temperature reaches a temperature exceeding 0 ° C. at which the frost attached to the evaporator 3 melts.

Then, at time T2 when the temperature of the internal temperature detecting means 14 rises, the compressor 12 is energized and turned on, and the cold air circulation control means 17 is opened. As a result, the temperature of the evaporator 3 drops, and cold air is sent to the freezer compartment 18 and the refrigerating compartment 20. If the temperature drops sufficiently, the compressor 12 stops. By repeatedly performing such an operation, while maintaining a substantially constant temperature, the frosted evaporator 3 is heat-exchanged with the relatively high temperature air in the refrigerating room to melt when the cooling system is stopped,
The drain guide 24 is discharged to the evaporation tray 25, and the compressor 1
It is evaporated with the heat of 2.

Further, the compressor 12 is stopped at the time T3 when the inside temperature detecting means 14 is sufficiently cooled, and is detected by the defrosting load detecting means 30 at the time when the damper 17a of the cold air circulation control means 17 is closed. When the defrosting load is larger than a predetermined amount G1, a part of the air heated by the defrosting heater 6 installed below the evaporator 3 is used as in the conventional defrosting method of the refrigerator / freezer. But above, ie the evaporator 3
Natural convection to the lower part occurs, and part of the heated air is guided by the heat convection guide 5 and naturally convection to both sides of the evaporator 3.
Further, a part of it convects to the central part of the evaporator 3.

Therefore, the frost attached to the surfaces of the evaporator 3 and the liquid storage tank 9 is defrosted by exchanging heat with the air that naturally convects upward.

As a result, instead of stopping the compressor at regular intervals and melting the frost in the evaporator by heating the defrosting heater as in the conventional case, the defrosting according to the defrosting load is achieved by the above configuration. When the method is switched and the defrosting load is small, while the cooling cycle is ON and OFF, the blowout to the freezer is closed and the cool air blower is driven to perform defrosting with the air heat source inside the refrigerator. As a result, the defrosting heater 6 is deenergized as much as possible, so that the heater power required for defrosting and the power required for operating the cooling system associated with the temperature rise during defrosting are suppressed, resulting in significant energy savings.

Moreover, since the evaporator 3 can be maintained in a state where there is almost no frost, the evaporator 3 can be maintained with a very high efficiency, so that a more energy-saving refrigerator / freezer can be provided.

Moreover, since the heating of the defrosting heater can be reduced, the temperature rise of the food in the freezer compartment or the refrigerator compartment can be suppressed, and higher quality food can be preserved.

Next, a second embodiment of the refrigerator-freezer according to the present invention will be described with reference to FIGS. 4 and 5 focusing on the points different from the first embodiment.

Reference numeral 31 is an evaporator frost amount detecting means installed on the upper left part of the evaporator 3. Generally, the evaporator frost formation detecting means 30 is installed at a position where frost is most likely to occur in the evaporator.

The operation of the refrigerator / refrigerator constructed as above will be described. The compressor keeps the refrigerator at a constant temperature by performing a normal operation operation of stopping when the temperature becomes lower and operating when the temperature becomes higher based on the output of the inside temperature detecting means 14.

The control operation of the temperature of the cool air circulation control means 17, the cool air blowing means 10 and the evaporator 3 in this normal operation mode will be described with reference to the timing chart of FIG.

While the compressor 12 is on, the cold air circulation control means 17 is opened by the damper 17a, and the cold air blowing means 10 is on to send the cool air to the inside of the refrigerator. As a result, the inside of the refrigerator is cooled and the temperature of the evaporator 3 also decreases with time.

At time T5 when the internal temperature detecting means 14 is sufficiently cooled, the compressor 12 is stopped and the damper 17a of the cold air circulation control means 17 is closed.

At this time, when the frost formation detected by the evaporator frost formation detection unit 31 is smaller than the predetermined amount G2, the cool air blowing unit 10 continues to blow air while being energized.

Therefore, the air blown by the cool air blowing means 10 does not flow into the freezer compartment 18 by the damper 17a of the cool air circulation control means 17, but goes into the refrigerating compartment 20 from the side opening 21 through the refrigerating compartment duct 19. Flows in.

Then, after cooling the inside of the refrigerator, 5 to 7
The temperature reaches about 0 ° C., returns to the evaporator chamber 2 from the suction port 23, exchanges heat with the evaporator 3 again, and is then sent to the opening 21 by the cool air blowing means 10. This operation is repeated.

As a result, the temperature of the evaporator 3 exchanges heat with the air at about 5 to 7 ° C., and the temperature rises rapidly.
Then, the temperature reaches a temperature exceeding 0 ° C. at which the frost attached to the evaporator 3 melts.

Then, at time T6 when the temperature of the internal temperature detecting means 14 rises, the compressor 12 is energized and turned on, and the cold air circulation control means 17 is opened. As a result, the temperature of the evaporator 3 drops, and cold air is sent to the freezer compartment 18 and the refrigerating compartment 20. If the temperature drops sufficiently, the compressor 12 stops. By repeatedly performing such an operation, while maintaining a substantially constant temperature, the frosted evaporator 3 is heat-exchanged with the relatively high temperature air in the refrigerating room to melt when the cooling system is stopped,
The drain guide 24 is discharged to the evaporation tray 25, and the compressor 1
It is evaporated with the heat of 2.

At the time T7 when the inside temperature detecting means 14 is sufficiently cooled, the compressor 12 is stopped, and at the time when the damper 17a of the cool air circulation control means 17 is closed, the evaporator frost amount detecting means 31 is used. When the detected frosting amount is larger than the predetermined amount G2, the defrosting heater 6 installed below the evaporator 3 is similar to the defrosting method of the conventional refrigerator-freezer.
Part of the air heated by means of natural convection to the upper part, that is, the lower part of the evaporator 3, and part of the heated air is guided by the heat convection guides 5 and naturally convection to both sides of the evaporator 3. Further, a part of it convects to the central part of the evaporator 3.

Therefore, the frost adhering to the surfaces of the evaporator 3 and the liquid storage tank 9 is defrosted by exchanging heat with the air that naturally convects upward.

As a result, instead of stopping the compressor at regular intervals and melting the frost of the evaporator by heating the defrosting heater as in the conventional case, the above-mentioned configuration allows defrosting depending on the defrosting load. When the method is switched and the defrosting load is small, while the cooling cycle is ON and OFF, the blowout to the freezer is closed and the cool air blower is driven to perform defrosting with the air heat source inside the refrigerator. As a result, the defrosting heater 6 is deenergized as much as possible, so that the heater power required for defrosting and the power required for operating the cooling system associated with the temperature rise during defrosting are suppressed, resulting in significant energy savings.

Moreover, since the evaporator 3 can be maintained in a state where almost no frost is formed at all times, the evaporator 3 can be maintained with a very high efficiency, so that a more energy-saving refrigerator / freezer can be provided.

Moreover, since the heating of the defrosting heater can be reduced, the temperature rise of the food in the freezer compartment or the refrigerating compartment can be reduced, and higher quality food can be preserved.

Next, a third embodiment of the refrigerator-freezer according to the present invention will be described with reference to FIGS. 6 and 7, focusing on the points different from the first embodiment.

Reference numeral 32 is a cooling system ON time detecting means for detecting the ON time of one cycle immediately before the cooling system.

The operation of the refrigerator constructed as described above will be described with reference to the timing chart of FIG.

While the compressor 12 is on, the cold air circulation control means 17 is opened by the damper 17a, and the cold air blowing means 10 is on to send the cool air to the inside of the refrigerator.

As a result, the freezer compartment 18 and the refrigerating compartment 20 are cooled to an appropriate temperature, and the temperature of the evaporator 3 also decreases with time. And at time T9 when the inside temperature detecting means 14 is sufficiently cooled
Thus, the compressor 12 is stopped and the damper 17a of the cold air circulation control means 17 is closed.

At this time, the cooling system ON time detecting means 32 detects the cooling system ON time of the immediately preceding cycle, and the cooling air blowing means 10 is driven only when the cooling system ON time TR1 is equal to or shorter than a predetermined time Ta.

The air blown by the cool air blowing means 10 does not flow into the freezer compartment 18 by the damper 17a of the cool air circulation control means 17 but flows into the refrigerating compartment 20 from the side opening 21 through the refrigerating compartment duct 19. .

Then, after cooling the inside of the refrigerator, 5 to 7
The temperature reaches about 0 ° C., returns to the evaporator chamber 2 from the suction port 23, exchanges heat with the evaporator 3 again, and is then sent to the opening 21 by the cool air blowing means 10. This operation is repeated.

As a result, the temperature of the evaporator 3 exchanges heat with the air of about 5 to 7 ° C., and the temperature rises rapidly.
Then, the temperature reaches a temperature exceeding 0 ° C. at which the frost attached to the evaporator 3 is melted.

Then, at time T10 when the temperature of the internal temperature detecting means 14 rises, the compressor 12 is energized and turned on, and the cold air circulation control means 17 is opened. As a result, the temperature of the evaporator 3 drops, and cold air is sent to the freezer compartment 18 and the refrigerator compartment 20,
When the temperature is lowered sufficiently, the compressor 12 is stopped. By repeating such operations, while maintaining a substantially constant temperature, when the cooling system is stopped, the frosted evaporator 3 is heat-exchanged with the relatively high temperature air in the refrigerating chamber to be melted and the drainage is drained. It is discharged to the evaporation tray 25 through the guide 24 and evaporated by the heat of the compressor 12.

The cooling system ON time detecting means 32 detects when the compressor 12 is stopped and the damper 17a of the cold air circulation control means 17 is closed at the time T11 when the inside temperature detecting means 14 is sufficiently cooled. When the cooling system ON time TR2 of one cycle immediately before OFF is longer than the predetermined time Ta, the defrost heater 6 is energized and the temperature is lowered below the evaporator 3 as in the defrosting method of the conventional refrigerator-freezer. Part of the air heated by the installed defrost heater 6 naturally convects upward, that is, to the lower part of the evaporator 3, and part of the heated air is guided by the heat convection guide 5 to cause evaporation of the evaporator 3. Natural convection on both sides of. Further, a part of it convects to the central part of the evaporator 3.

Therefore, the frost adhering to the surfaces of the evaporator 3 and the liquid storage tank 9 is defrosted by exchanging heat with the air that naturally convects upward.

As a result, instead of stopping the compressor at regular intervals and melting the frost in the evaporator by heating the defrosting heater as in the conventional case, the defrosting method by the defrosting load can be performed by the above-described configuration. When the switching and cooling system ON time is short, the blowoff to the freezer is closed during the ON / OFF of the cooling cycle, and the cool air blowing means is used only when the evaporator suction temperature necessary for defrosting is obtained. It is driven and defrosts by the air heat source inside the refrigerator, and the cooling system is turned on.
When the time is long, defrosting is performed by the defrosting heater 6 as in the conventional case.

As a result, the power supply to the defrosting heater 6 is eliminated as much as possible, so that the heater power required for defrosting and the power required for operating the cooling system accompanying the temperature rise during defrosting can be reduced, resulting in significant energy savings.

Moreover, since the evaporator 3 can be maintained in a state where there is almost no frost, it is possible to maintain the evaporator 3 with a very high efficiency, and thus it is possible to provide a more energy-saving refrigerator / freezer. Moreover, since the defrosting heater is less heated than in the conventional case, the temperature rise of the food in the freezing room or the refrigerating room can be suppressed, and higher quality food can be preserved.

Next, a fourth embodiment of the refrigerator-freezer according to the present invention will be described with reference to FIGS. 8 and 9 focusing on the points different from the first embodiment.

Reference numeral 33 is an outside air temperature detecting means for detecting the outside air ambient temperature of the refrigerator. The operation of the refrigerator / refrigerator configured as described above will be described with reference to the timing chart of FIG.

While the compressor 12 is on, the cool air circulation control means 17 is opened by the damper 17a, and the cool air blowing means 10 is on to send the cool air into the refrigerator.

As a result, the freezing compartment 18 and the refrigerating compartment 20 are cooled to an appropriate temperature, and the temperature of the evaporator 3 also decreases with time.

At time T13 when the inside temperature detecting means 14 is sufficiently cooled, the compressor 12 is stopped and the damper 17a of the cool air circulation control means 17 is closed. At this time, the outside air temperature detecting means 33 detects the outside air temperature, and the cold air blowing means 10 is driven only when the outside air temperature falls within a preset temperature range.

The air blown by the cool air blowing means 10 does not flow into the freezer compartment 18 by the damper 17a of the cool air circulation control means 17 but flows into the refrigerating compartment 20 from the side opening 21 through the refrigerating compartment duct 19. . Then, after cooling the inside of the refrigerator, the temperature reaches about 5 to 7 ° C., the air returns from the suction port 23 to the evaporator chamber 2, exchanges heat with the evaporator 3 again, and is then sent to the opening 21 by the cool air blowing means 10. Be done. This operation is repeated.

As a result, the temperature of the evaporator 3 exchanges heat with the air of about 5 to 7 ° C., and the temperature rises rapidly.
Then, the temperature reaches a temperature exceeding 0 ° C. at which the frost attached to the evaporator 3 is melted.

Then, at time T14 when the temperature of the internal temperature detecting means 14 rises, the compressor 12 is energized and turned on, and the cold air circulation control means 17 is opened. As a result, the temperature of the evaporator 3 drops, and cold air is sent to the freezer compartment 18 and the refrigerator compartment 20,
When the temperature is lowered sufficiently, the compressor 12 is stopped. By repeating such operations, while maintaining a substantially constant temperature, when the cooling system is stopped, the frosted evaporator 3 is heat-exchanged with the relatively high temperature air in the refrigerating chamber to be melted and the drainage is drained. It is discharged to the evaporation tray 25 through the guide 24 and evaporated by the heat of the compressor 12.

Further, the compressor 12 is stopped at the time T13 'when the inside temperature detecting means 14 is sufficiently cooled, and the outside air temperature detecting means 33 detects it at the time when the damper 17a of the cold air circulation controlling means 17 is closed. When the outside air temperature is not included in the predetermined temperature range, the mode is switched to the defrosting method of the conventional refrigerator / freezer, and the compressor 12 is operated for a predetermined time in the same manner as the conventional refrigerator. The cool air blowing means 10 is turned off while the compressor 12 is turned on, the cool air blowing means 10 is turned on while the compressor 12 is turned on, and the cool air blowing means 10 is installed below the evaporator 3 at a predetermined time. A part of the air heated by the defrosting heater 6 is naturally convected to the upper side, that is, the lower part of the evaporator 3, and a part of the heated air is guided by the heat convection guides 5 to both side parts of the evaporator 3. Natural convection to. Further, a part of it convects to the central part of the evaporator 3.

Therefore, the frost attached to the surfaces of the evaporator 3 and the liquid storage tank 9 is defrosted by exchanging heat with the air that naturally convects upward. After that, the compressor 12 is turned on and the above-described operation is repeated.

As a result, instead of stopping the compressor at regular intervals and melting the frost of the evaporator by heating the defrosting heater as in the conventional case, the cooling cycle O
While N and OFF are turned off, the blowout to the freezer is closed, and the cold air blower is driven only when the outside air temperature allows defrosting at the air temperature inside the refrigerator and the air heat source inside the refrigerator removes it. Do frost.

As a result, the power to the defrosting heater 6 is removed as much as possible, so that the heater power required for defrosting and the power required to operate the cooling system associated with the temperature rise during defrosting can be reduced, resulting in significant energy savings.

Moreover, since the evaporator 3 can be maintained in a state where there is almost no frost, the evaporator 3 can be maintained very efficiently, and thus a more energy-saving refrigerator / freezer can be provided.
Moreover, since the defrosting heater heats less than before, it is possible to reduce the temperature rise of the food in the freezer or the refrigerator,
Higher quality food can be preserved.

[0085]

As described above, the refrigerating refrigerator of the present invention does not melt the frost of the evaporator only by heating the defrosting heater and stopping the compressor at regular intervals as in the prior art, but has the above-mentioned configuration. Thus, when the defrosting load is small, the cooling air is blown to the freezing room while the cooling cycle is on and off, and the cold air blowing means is driven to defrost the air from the air source in the refrigerator. Since the frequency of use of the defrost heater is reduced, the power for the defrost heater can be saved.
Moreover, since the evaporator can be maintained in a state where there is almost no frost, it provides a very efficient and energy-saving refrigerator / freezer. Moreover, the frequency of heating of the defrosting heater is reduced, so that the temperature rise of the food in the freezer compartment or the refrigerator compartment is reduced, and higher quality food can be preserved.

Further, when the amount of frost formation on the evaporator is small, while the cooling cycle is on and off, the blowout to the freezer is closed and the cold air blowing means is driven to defrost by the air heat source in the refrigerator. By doing so, the frequency of use of the defrost heater is reduced, so the electric power of the defrost heater can be saved, and the evaporator can be maintained in a state where almost no frost is formed at all. I will provide a.

Moreover, since the frequency of heating of the defrosting heater is reduced, the temperature rise of the food in the freezer compartment or the refrigerator compartment is reduced,
Higher quality food preservation is possible.

When the cooling system ON time is shorter than the preset time, the cooling cycle is turned ON / OFF.
The power of the defrost heater is reduced because the frequency of use of the defrost heater is reduced by closing the blow-off to the freezer and driving the cool air blower to defrost the air heat source inside the refrigerator while the power is off. It saves energy and keeps the evaporator almost free from frost, providing a very efficient and energy-saving refrigerator / freezer.

Moreover, since the frequency of heating of the defrosting heater is reduced, the temperature rise of the food in the freezer compartment or the refrigerator compartment is reduced,
Higher quality food preservation is possible.

When the outside air temperature is within the preset temperature range, the cooling cycle is turned ON and OFF is turned OFF.
Inside, the frequency of use of the defrost heater is reduced by closing the blowout to the freezer and driving the cool air blower to defrost the air heat source in the refrigerator. It provides energy-saving refrigerators and refrigerators that are extremely efficient and energy-saving because the evaporator can be maintained in a state where there is almost no frost. Moreover, the frequency of heating of the defrosting heater is reduced, so that the temperature rise of the food in the freezer compartment or the refrigerating compartment is reduced, and higher quality food can be preserved.

[Brief description of drawings]

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

FIG. 2 is a front view of the main part of the refrigerator-freezer according to the embodiment.

FIG. 3 is a timing chart of the refrigerator-freezer in the same embodiment.

FIG. 4 is a front view of the essential parts of the refrigerator-freezer according to the second embodiment.

FIG. 5 is a timing chart of the refrigerator-freezer according to the second embodiment.

FIG. 6 is a configuration diagram of a cooling system according to a third embodiment.

FIG. 7 is a timing chart of the refrigerator-freezer according to the third embodiment.

FIG. 8 is a vertical sectional view of a refrigerator-freezer according to a fourth embodiment.

FIG. 9 is a timing chart of the refrigerator / freezer according to the fourth embodiment.

FIG. 10 is a configuration diagram of a cooling system for a conventional refrigerator-freezer.

FIG. 11 is a front view of a main part of a conventional refrigerator-freezer.

[Explanation of symbols]

 1 Refrigerator Box 2 Evaporator Chamber 3 Evaporator 4 End Plate 5 Heat Convection Guide 6 Defrost Heater 7 Casa 8 Toy 9 Liquid Storage Tank 10 Cold Air Blower 11 Defrost Timer 12 Compressor 14 Internal Temperature Detecting Means 17 Cold Air Circulation control means 17a Damper 18 Freezing room 19 Refrigerating room duct 20 Refrigerating room 21 Cold air circulation control means 22 Cold air suction port 23 Cold air upper surface suction port 24 Drain guide 25 Evaporation tray 30 Defrost load detection means 31 Evaporator frost amount detection means 32 Cooling system ON time detection means 33 Outside air temperature detection means

Claims (4)

[Claims] 1. O based on the output result of the internal temperature detection means
N, OFF cooling system, cold air circulation control means for controlling cold air circulation to the freezer, cold air blowing means for sending cold air cooled by the evaporator, and defrost load detection means for detecting defrost load. And the cooling system is off
And, only when the defrosting load is smaller than a preset value, the cold air circulation control means of the freezing room prevents the cold air from flowing into the freezing room and drives the cold air blowing means. 2. O based on the output result of the internal temperature detection means
N, OFF cooling system, cold air circulation control means for controlling cold air circulation to the freezer, cold air blowing means for sending cold air cooled by the evaporator, and evaporator attachment for detecting evaporator frost amount The cold air circulation control means for the freezing compartment prevents the inflow of cold air into the freezing compartment only when the cooling system is turned off and the evaporator frost formation amount is less than the preset frost formation amount. A freezer-refrigerator that drives cold air blowing means. 3. O based on the output result of the internal temperature detection means
O of cooling system, cooling system for turning off and on, cooling air circulation control means for controlling cooling air circulation to the freezing compartment, cooling air blowing means for feeding the cooling air cooled by the evaporator, and cooling system
The cooling system ON time calculating means for calculating the N time is provided, and the cooling air inflow to the freezing room is controlled by the cooling air circulation control means of the freezing room only when the cooling system is OFF and the cooling system ON time is shorter than a preset time. A freezer-refrigerator that prevents the air and blows cold air. 4. O based on the output result of the in-compartment temperature detecting means
N, OFF cooling system, cold air circulation control means for controlling cold air circulation to the freezing compartment, cold air blowing means for sending cold air cooled by the evaporator, and outside air temperature detecting means for detecting the outside air temperature of the refrigerator And the cooling system is O
A freezer-refrigerator in which cold air circulation control means of the freezing compartment prevents cold air from flowing into the freezing compartment and drives the cold air blowing means only when FF is performed and the outside air temperature is within a preset temperature range.