JP3098909B2 - 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 regenerative refrigerator in which the interior of a refrigerator is kept cool by using a heat storage material.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of effective use of late-night power or leveling by peak cut of daytime power demand, a regenerative refrigerator that cools the inside of a refrigerator using a regenerative material has been disclosed in Japanese Patent Application Laid-Open No. Sho 63-163. As shown in Japanese Patent No. 247577, this is considered.

An example of the above-described conventional regenerative refrigerator will be described below with reference to the drawings.

The structure of the refrigerating cycle is as shown in FIG. 8, in which a compressor 4, a condenser 5, a first capillary 7, a second capillary 7a, and a cooler 8 are connected in sequence, and Constructs a refrigeration cycle. 19 is a cooler 8
Cooling fan.

[0005] In parallel with the second capillary 7a and the cooler 8, a series circuit of the first on-off valve 6a, the third capillary 7c and the regenerator 16 for the refrigerator, and the regenerator 16a for the condenser are provided.
And the series circuit of the second on-off valve 6b.

The regenerator 16 for the refrigerator compartment is filled with a latent heat type heat storage material 11, a refrigerant tube 12 for cooling and freezing the heat storage material 11 is disposed in a heat exchange manner, and fins 15 are provided on the outer surface. . Reference numeral 20 denotes a cooling fan for a regenerator.

The condenser regenerator 16a is filled with a latent heat type heat storage material 21, and a refrigerant pipe 22 for cooling and freezing the heat storage material 21 is disposed in a heat exchange manner. A refrigerant circuit having a third on-off valve 6 that connects the outlet of the condenser 5 with the condenser heat storage unit 16a and the second on-off valve 6b is provided to form a refrigeration cycle.

A control circuit 23 includes a compressor 4, a first on-off valve 6a, a second on-off valve 6b, a third on-off valve 6, a cooling fan 19, and a regenerator cooling fan 2 as shown by dotted arrows.
0 is controlled.

FIG. 9 is a vertical cross-sectional side view showing the structure of the refrigerator-freezer, and portions corresponding to those in FIG. The cooler 8 is disposed in the freezer compartment 17, and the regenerator 1 for the refrigerator compartment is provided.
6 is disposed in the refrigerator compartment 18, and the condenser regenerator 16 a is disposed in the heat insulating wall 23 of the freezer compartment 17. The freezer compartment 17 and the refrigerating compartment 18 communicate with each other via a duct (not shown).

Reference numeral 26 denotes a damper thermostat, which discharges a part of the cool air cooled by the cooler 8 into the refrigerator compartment 18 to control the cooling of the refrigerator compartment 18 to an arbitrary temperature.

In this configuration, during the normal cooling operation, the first
, The second on-off valve 6b, the third on-off valve 6b and the third on-off valve 6 are closed, and the compressor 4 → condenser 5 → first capillary 7 → second capillary 7a → cooler 8 → compressor A refrigeration cycle consisting of four routes is formed, and the freezing room 17 and the refrigerating room 18 are cooled to a predetermined temperature by the cooling fan 19 and the damper thermo 26.

During the heat storage operation at midnight, the first opening / closing valve 6a and the second opening / closing valve 6b are opened intermittently, and the refrigerant flows into the refrigerant tubes 12, 22 of the regenerator 16 for the refrigerator compartment and the regenerator 16a for the condenser, respectively. Flows, the heat storage materials 11 and 21 are frozen, and the cold heat source is stored.

During a predetermined heat storage cooling operation in the daytime, the first on-off valve 6a and the second on-off valve 6b are closed and the third on-off valve 6b is closed.
The on-off valve 6 is opened to form a refrigeration cycle consisting of the path of the compressor 4 → condenser 5 → condenser regenerator 16a → second capillary 7a → cooler 8 → compressor 4.

Then, the freezing chamber 17 is cooled by a refrigeration cycle having a small compression ratio using the cold heat source of the condenser regenerator 16a as the cooling heat source of the condenser 5. In addition, since the refrigerating compartment 18 operates the regenerator cooling fan 20 to cool the refrigerating compartment 18 with the cold heat source of the refrigerating compartment regenerator 16, the power consumption can be greatly reduced as compared with the normal cooling operation.

[0015]

However, in the above-described configuration, the amount of cooling load heat of the refrigerating compartment during the heat storage cooling operation in the daytime (time period excluding the nighttime heat storage operation time) is low when the outside air temperature is low such as in winter. When the heat storage amount of the heat storage device is smaller than the heat storage amount, the heat storage material is not completely melted even after the heat storage cooling operation is completed, and the frost on the heat storage material surface does not melt, so frost remains on the next day. If the frost-remaining phenomenon lasts for several days, the frost blocks the air path, and there is a problem that the heat storage cooling capacity of the refrigerator compartment during the heat storage cooling operation is reduced.

The present invention solves the above-mentioned problems. Since the heat storage and cooling capacity can be sufficiently secured by defrosting the heat storage material surface even when the outside air temperature is low, the power consumption of the refrigerator during the daytime can be reduced throughout the year. An object of the present invention is to provide a refrigerator that can reduce the amount of heat stored therein and can effectively use the heat storage energy stored in the heat storage device.

[0017]

In order to solve the above-mentioned problems, a refrigerator according to the present invention comprises a refrigeration cycle in which a cooler and a heat accumulator having a heat accumulating material disposed inside a refrigerator compartment are connected in parallel or in series. A regenerator fan that sends out cool air in the regenerator, a ventilation duct that communicates the regenerator with the regenerator, a heat storage operation that stores heat in the regenerator at an arbitrary time, and the stored heat in the refrigerator. Time control means for performing time control of the heat storage cooling operation to cool the heat storage temperature detection means for detecting the temperature of the heat storage material, the melting temperature of the heat storage material is a temperature higher than the freezer compartment temperature, The target load calorie of the heat storage cooling operation is all refrigerator compartments except the freezer compartment,
When the heat storage material temperature is continuously detected by the heat storage temperature detecting means before the start time of the heat storage operation for a given number of days that the heat storage material temperature is equal to or lower than the temperature at which the frost to which the heat storage material temperature adheres is melted, The heat storage operation is controlled to be stopped until the temperature of the heat storage material becomes equal to or higher than the temperature at which the attached frost melts.

Further, a refrigeration cycle in which a cooler and a heat accumulator having a heat accumulating material disposed in a refrigerator compartment are connected in parallel or in series, a heat accumulator fan for sending out cold air in the heat accumulator, And a ventilation duct communicating the regenerator, and a time control means for performing time control of a regenerative operation for storing heat in the regenerator in an arbitrary time zone and a regenerative cooling operation for cooling the refrigerator with the stored heat. A heat storage temperature detection means for detecting a temperature of the heat storage material; and an operation time detection means for accumulating an operation time of the heat storage fan, wherein a melting temperature of the heat storage material is set to a temperature higher than a freezing room temperature. The load heat quantity to be subjected to the cooling operation is set to all the refrigerating compartments other than the freezing compartment, and the heat storage material temperature is measured by the heat storage temperature detecting means before the start time of the heat storage operation so that the frost to which the heat storage material temperature adheres is melted. If it is detected continuously that the heat storage fan has been operated for an arbitrary time until the operation time detecting means detects that the heat storage operation is performed, the frost to which the heat storage material temperature adheres is melted. The operation is stopped until the temperature becomes higher than the required temperature.

[0019]

According to the present invention, a heat storage material having a large latent heat of fusion can be used, the decrease in the effective internal volume of the refrigerator can be suppressed as much as possible, the stored heat can be used effectively, and the outside air temperature is low and the daytime heat storage can be achieved. Even when the cooling load heat capacity of the refrigerating compartment during the cooling operation (time period excluding nighttime heat storage operation time) is smaller than the heat storage capacity of the heat storage device, the heat storage device can be easily defrosted. By effectively using the stored heat energy, the power consumption of the refrigerator during the day can be reduced throughout the year.

Further, since the stoppage control of the heat storage operation is controlled by the operation time of the heat storage fan, the heat storage device can be naturally defrosted irrespective of the use condition of the customer in the daytime.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a functional block diagram of a refrigerator in a first embodiment of the present invention, FIG. 2 is a diagram of a refrigeration system in the embodiment, FIG. 3 is an electric circuit diagram of main parts in the embodiment, and FIG. FIG. 5 is a flowchart in the embodiment, and FIG. 5 is a one-day operation state diagram according to the room temperature in the embodiment.

In FIGS. 1 and 3, reference numeral 30 denotes a refrigerator main body, and a cabinet 2 having a built-in heat insulating material and a door 3.
And a gasket 14 for sealing a gap between the door 3 and the cabinet 2. The interior is partitioned into two compartments, an upper freezer compartment 17 and a lower refrigerating compartment 18, by a horizontally arranged heat insulating partition wall 33, and a refrigerator compartment suction port 35 is formed in the heat insulating partition wall 33. .

Reference numeral 62 denotes a cooling room provided in the freezing room 17, in which the cooler 8, the cooling fan 19, and a heater 58 for defrosting the cooler are provided, and 36 is a freezing room suction port. is there.

Reference numeral 26 denotes a damper for adjusting the amount of cold air blown into the refrigerator compartment duct 25 by the cooling fan 19 to the refrigerator compartment 18 to control the refrigerator compartment 18 to a set temperature.

Reference numeral 31 denotes a regenerator, a regenerator 34 in which a regenerator 32 is filled, a regenerator cooling pipe 38 for cooling the regenerator 32 in the regenerator 34, and a cool air in the regenerator 31. Thermal storage fan 39 for blowing air and thermal storage material temperature sensor 5
7 are arranged.

Reference numeral 37 denotes a heat storage unit suction port formed in the heat storage unit 31; reference numeral 56 denotes a heat storage temperature detecting means for detecting the temperature of the heat storage material 32 by a heat storage material temperature sensor 57 mounted in the heat storage unit 31; Is a ventilation duct which connects the heat storage unit 31 and the cooling chamber 62 provided on the back of the refrigerator compartment.

Reference numeral 63 denotes a defrosting start judging means for judging the defrosting start time of the cooler 8 in accordance with a signal of the room temperature detecting means 40 for detecting the ambient temperature of the refrigerator.

Only the portions of the electric circuit diagram relevant to the gist of the present invention are shown, and reference numeral 46 denotes C as time control means.
The PU operates according to a program stored in a storage circuit (not shown) as is well known, and includes a clock circuit 45 that outputs the current time, a room temperature detection unit 40, a freezer temperature detection unit 44, and a refrigerator temperature detection unit 75. The power supply control of the relays 47, 49, 51, 53, 59, 66 is performed by the output signal of. That is, each relay 47, 49, 51, 5
3, 59, 66 connected to each of the transistors 48, 5
By applying a high-level signal to the bases of 0, 52, 54, 60, 67, each of the relays 47, 49, 51, 5,
3, 59 and 66 are energized.

When the relay 47 is energized, the compressor 4
Drives. When the relay 49 is energized, the electromagnetic valve 64 operates to communicate the condenser 5 and the cooler 8. When the relay 51 is energized, the electromagnetic valve 65 operates to communicate the capacitor 5 and the regenerator 31. When the relay 53 is energized, the cooling fan 19 operates. When the relay 59 is energized, the heater 5
8, the cooler 8 is defrosted, and when the relay 66 is energized, the regenerator fan 39 operates.

The freezer temperature detecting means 44 outputs a signal to the time control means 46 when the value detected by the freezer compartment temperature sensor 43 is equal to or higher than the set temperature. The refrigerator temperature detecting means 75 outputs a signal to the time control means 46 when the value detected by the refrigerator temperature sensor 74 is equal to or higher than the set temperature. The room temperature detecting means 40 digitizes the output voltage of the room temperature sensor 41 from the room temperature sensor 41 by the A / D converter 42 and outputs the signal to the time control means 46. Further, the heat storage temperature detecting means 56 outputs a signal to the time control means 46 when the value detected by the heat storage material temperature sensor 57 is equal to or higher than the set temperature.

In FIG. 2, reference numeral 4 denotes a compressor,
The solenoid valve 64 and the solenoid valve 65 are connected via the capacitor 5. Further, the solenoid valve 64 is connected to the compressor 4 through the capillary 7, the cooler 8 and the accumulator 13 in this order.
Connected to. On the other hand, the solenoid valve 65 is connected to the regenerator capillary 9 and the regenerator cooling pipe 38 arranged in the regenerator 31.
Are sequentially connected to the accumulator 13.

The operation of the refrigerator constructed as described above will be described with reference to FIGS. 1, 2, 3, 4 and 5.

In the normal cooling operation, the inside of the refrigerator is cooled by using the cooler 8 and kept at a set temperature. That is, CPU4
6, the relay 49 is turned on and the relay 66 is turned off, so that the refrigerant flow path is connected to the cooler 8 (step S5).
1), the regenerator fan 39 is stopped (step S2), and when the internal temperature is equal to or higher than the set value, the signal from the freezer internal temperature detecting means 44 causes the CPU 46 to operate the relays 47 and 5
By turning on the compressor 3 and operating the compressor 4 and the cooling fan 19 (step S3), the cool air from the cooler 8 is supplied to the freezer compartment 17 from the upper outlet 20 of the freezer compartment 17 for the freezer compartment 17.
The inside of the refrigerator is cooled below the set temperature by circulating through the inside of the refrigerator compartment suction port 36 and circulating through the refrigerator compartment duct 25, the damper 26, and the refrigerator compartment 18 through the refrigerator compartment suction port 35. I do.

When the temperature in the refrigerator becomes equal to or lower than the set value, the signal of the temperature detector 44 in the refrigerator becomes OFF and the CPU 4
6 turns off the relays 47 and 53 to stop the circulation of the refrigerant and the cool air (step S4). By repeating the above operation, the inside of the refrigerator is kept cool to the set temperature.

In the heat storage operation, during a predetermined time period during which nighttime power demand is low (from 23:00 to 7:00 of the next day) (step S5), the heat storage material 32 filled in the heat storage device 31 is charged at a predetermined time during the night. The electric power in the time zone is stored instead of heat. That is, when the temperature in the refrigerator is equal to or higher than the set value, the signal from the freezer temperature detecting means 44 causes the CPU 46 to operate the relay 4.
7 and 53 are turned on, the compressor 4 and the cooling fan 1
9 is performed (step S6), and when the temperature in the refrigerator becomes equal to or lower than the set value, the relays 51 and 47 are turned on by the CPU 46 based on the signal from the temperature detector 44 in the freezer to store the refrigerant in the refrigerant passage. The refrigerant is held on the side where the heat exchanger 31 communicates, and the refrigerant is stored by operating the compressor 4.
The heat storage material 32 is evaporated by the heat storage device cooling pipe 38, and the heat storage material 32 is frozen (step S7).

The weight of the heat storage material 32 is as follows:
The weight is set based on the room in the refrigerated temperature zone at the time of low room temperature (15 ° C.) such as in autumn. That is, at the time of the low room temperature, the total load heat amount of the refrigerating compartment during a predetermined time period (from 7:00 to 23:00) when the daytime power demand is large, and the sum of the sensible heat amount and the latent heat amount up to the melting temperature of the heat storage material is obtained. The weight should be equivalent to the calorific value.

In the heat storage cooling operation, the return air in the room other than the freezing room is cooled by using the heat stored by the heat storage unit 31 during the peak time of daytime power demand. That is, when the freezing room temperature is equal to or higher than the set value, the CPU 46 turns on the relays 47 and 53 by a signal from the freezer temperature detecting means 44.
By operating the compressor 4 and the cooling fan 19, the freezing room is cooled to a set temperature or lower.

The temperature of the refrigerator compartment 18 is controlled to a set temperature by controlling the operation of the regenerator fan 39. When the temperature of the refrigerator compartment is equal to or higher than the set temperature, the CPU 46 turns on the relay 66 by a signal from the refrigerator temperature detecting means 75.
N (step S8), and by operating the regenerator fan 39, the cool air discharged from the refrigerating room duct 25 into the refrigerating room 18 is sucked into the regenerator 31 from the regenerator suction port 37, and is cooled before being ventilated. It returns to the cooler 8 via the duct 55. Thus, the amount of heat to be cooled by the cooler 8 is only the amount of heat applied to the freezing compartment.

When the temperature in the refrigerator becomes lower than the set value, the signal of the temperature detector 44 in the refrigerator becomes OFF and the CPU 4
6 turns off the relays 47, 53 and 66 and stops the circulation of the compressor and the cool air. By repeating the above operation, the inside of each refrigerator is kept at the set temperature.

The method for controlling the defrosting of the cooler 8 is determined by the ambient temperature (room temperature) of the refrigerator. It is cabinet 2
The amount of heat entering from outside, the refrigeration capacity of the system, and the amount of moisture entering when opening and closing the door 3 change depending on the room temperature.
This is because the amount of frost to be frosted is different.

In the summer time when the heat storage operation time is long and the room temperature is high,
Room temperature detecting means 4 that the temperature is equal to or higher than the set temperature at an arbitrary time
The defrost start determination means 63, which receives the signal from 0, ensures that the frost formed on the cooler 8 is thawed without fail during the daytime except when the power demand peaks and during the nighttime. Start the frost.

In a season in which the heat storage operation time is short and the room temperature is low, the defrost start determination means 63 starts defrosting the cooler 8 in a predetermined time zone at night when power demand is low.

For example, as shown in FIG. 5, defrosting is started at 11:00 and 23:00 when the room temperature is higher than the set temperature, and at 23:00 when the room temperature is lower than the set temperature.

Next, a method of controlling each operation will be described. The time control means 46 performs an alternate operation of the normal cooling operation and the heat storage operation after the defrost of the cooler 8 during a predetermined time period during which the nighttime power demand is low (from 23:00 to 7:00 the next day). That is, when the internal temperature is equal to or higher than the set value, the internal cooling is performed by the normal cooling operation,
When the temperature in the refrigerator is equal to or lower than the set value, the heat storage operation is performed to store the heat instead of heat (step S5). The end of freezing is detected to end the heat storage operation (step S10).

Further, during the heat storage cooling operation in the daytime, the heat storage material 32 is not completely melted and the heat storage material 32 is not completely melted even when the heat storage cooling operation is completed because the cooling load heat amount of the refrigerator compartment is smaller than the heat storage amount of the heat storage device. Since the frost cannot be melted, the frost remaining on the heat storage material 32 by the heat storage temperature detecting means 56 before the start of the heat storage operation is completely removed at a low room temperature (15 ° C.) or less when the frost remains on the next day. It is detected that the temperature has not reached the melting temperature (step S12), and if the state continues for an arbitrary number of days (for example, 5 days) (step S1)
In 3), the heat storage operation is stopped until the heat storage temperature detecting means 56 detects that the temperature of the frost on which the heat storage material 32 is frosted is completely melted or higher.

According to the above control, the frost formed on the heat storage unit 31 to which no heat is supplied by the heat storage operation is completely melted by the heat load during the heat storage cooling operation on the next day. As a result, the regenerator 31 can perform the natural defrosting until the amount of frost that affects the cooling capacity during the thermal storage cooling operation is reached, so that the regenerator 31 can always have the necessary cooling capacity.

The daytime load amount is estimated by the time control means 46 from the average daytime room temperature of the day before detected by the room temperature detection means 40.

Based on this estimated value, the time control means 46 determines that at least the daytime power demand is in the peak time zone (13:00 from 13:00).
6:00) is started (step S11). Then, the heat storage temperature detecting means 56
When the temperature exceeds the set temperature (the temperature at which the attached frost melts) and the cooling capacity of the heat accumulator 31 is lost, a signal indicating that the frost has been melted and melted is sent to the time control means 46 to thereby store and cool the heat. Operation is terminated.

For example, as shown in FIG. 5, the time for the heat storage cooling operation is about 7 hours when the room temperature is 30 ° C., and about 16 hours when the room temperature is 15 ° C.

As described above, according to the present embodiment, the cooler 8
And a refrigerating cycle in which a regenerator 31 having a regenerator material 32 disposed inside the refrigerating chamber 18 are connected in parallel or in series, and a regenerator fan 3 for sending out cool air in the regenerator 31
9, a ventilation duct 55 for communicating the cooler 8 with the heat accumulator 31, a heat accumulating operation for accumulating heat in the heat accumulator 31 at an arbitrary time, and a heat accumulating cooling for cooling the refrigerator 18 by the accumulated heat. Time control means for performing time control of operation,
Heat storage temperature detecting means 56 for detecting the temperature of the heat storage material 32
Wherein the melting temperature of the heat storage material 32 is higher than the freezing room temperature, the target load heat amount of the heat storage cooling operation is all the refrigerating rooms other than the freezing room, and the heat storage material is stored before the start time of the heat storage operation. When the heat storage material temperature continuously detects that the heat storage material temperature is equal to or lower than the temperature at which the frost to which the heat storage material temperature adheres is melted up to an arbitrary number of days, the heat storage operation is performed when the heat storage material temperature is reduced. Since it is controlled to stop until the temperature of the adhering frost becomes higher than the melting temperature, a heat storage material with a large latent heat of melting can be used, the decrease in the effective internal volume of the refrigerator is suppressed as much as possible, and the heat stored can be used effectively, Also, even when the outdoor air temperature is low and the cooling load heat amount of the refrigerator compartment during the daytime heat storage cooling operation is smaller than the heat storage amount of the heat storage device, the frost residue of the heat storage device can be periodically naturally defrosted. Heat storage And effective use of the thermal storage energy, it is possible to reduce the daytime power consumption of refrigerators throughout the year.

Next, a refrigerator according to a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the conventional and the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 68 denotes an operation time detecting means, which accumulates the operation time of the regenerator fan 39 and outputs it to the time control means 46 when an arbitrary time has elapsed.

During the daytime heat storage cooling operation, the heat storage material 32 is not completely melted and the frost on the surface of the heat storage material even if the cooling load heat amount of the refrigerator compartment is smaller than the heat storage amount of the heat storage device 31 and the heat storage cooling operation ends. When the temperature is lower than the low room temperature (15 ° C.) where the frost remains on the next day, the heat storage temperature detecting means 56 completely melts the frost on the heat storage material 32 before the heat storage operation starts. When the operating time detecting means 68 detects that the temperature has not reached the operating temperature (step S12) and that the state has continued for an arbitrary time (for example, 40 hours) (step S13), the heat storage is performed. The heat storage operation is stopped until the temperature detecting means 56 detects that the temperature of the frost on which the heat storage material 32 is frosted is equal to or higher than the temperature at which the frost is completely melted.

By the above control, the frost formation state of the heat accumulator can be grasped by detecting the operation time of the heat accumulator fan 39 irrespective of the use condition of the customer used. Defrosted frost can be completely removed.

As described above, according to the present embodiment, the cooler 8
And a refrigerating cycle in which a regenerator 31 having a regenerator material 32 disposed inside the refrigerating chamber 18 are connected in parallel or in series, and a regenerator fan 3 for sending out cool air in the regenerator 31
9, a ventilation duct 55 communicating the cooler 8 with the heat accumulator 31; a heat accumulating operation for accumulating heat in the heat accumulator 31 at an arbitrary time; and a heat accumulating cooling operation for cooling the refrigerator with the heat accumulated. Time control means 46 for performing time control of
Heat storage temperature detecting means 56 for detecting the temperature of the heat storage material 32
Operating time detecting means 68 for accumulating the operating time of the regenerator fan 39, wherein the melting temperature of the heat storage material 32 is higher than the freezing room temperature, and the target load heat amount of the regenerative cooling operation is the freezing room. And the heat storage fan is operated for an arbitrary time by the heat storage temperature detecting means 56 that the temperature of the heat storage material is equal to or lower than the temperature at which the attached frost melts before the start time of the heat storage operation. If the heat storage operation is continuously detected until the operation time detection means detects that the heat storage operation is stopped, the heat storage operation is stopped until the temperature of the heat storage material becomes equal to or higher than the temperature at which the frost to which the attached heat storage material is melted. By performing the control based on the operation time of the heat storage fan, the heat storage device can be naturally defrosted irrespective of the use state of the customer in the daytime.

[0057]

As described above, according to the present invention, a refrigerating cycle in which a cooler and a heat accumulator having a heat accumulating material disposed inside a refrigerator compartment are connected in parallel or in series, and cool air in the heat accumulator is sent out. A regenerator fan, a ventilation duct communicating the cooler with the regenerator, a heat storage operation for storing heat in the regenerator in an arbitrary time zone, and a time for a heat storage cooling operation for cooling the refrigerator by the stored heat. Time control means for performing control, heat storage temperature detection means for detecting the temperature of the heat storage material, the melting temperature of the heat storage material is a temperature higher than the freezer compartment temperature, the target load calorie of the heat storage cooling operation is Any number of days in which all the refrigerating rooms other than the freezing room are used, and the number of days that the temperature of the heat storage material is equal to or lower than the temperature at which the frost to which the heat storage material temperature adheres is melted by the heat storage temperature detecting unit before the start time of the heat storage operation Up to If it is detected, the heat storage operation is controlled so as to be stopped until the temperature of the heat storage material becomes equal to or higher than the temperature at which the adhering frost melts, so that the outdoor air temperature is low and the cooling load of the refrigerator compartment during the daytime heat storage cooling operation is reduced. Even when the amount of heat is smaller than the amount of heat stored in the regenerator, natural defrosting can be performed on the frost residue of the regenerator periodically, so that the heat storage energy stored in the regenerator can be effectively used without reducing the cooling capacity of the regenerator. Used to reduce daytime power consumption of refrigerators throughout the year.

Further, a refrigerating cycle in which a cooler and a heat accumulator having a heat accumulating material disposed inside a refrigerator compartment are connected in parallel or in series, a heat accumulator fan for sending cool air in the heat accumulator, and a heat accumulator fan. And a ventilation duct communicating the regenerator, and a time control means for performing time control of a regenerative operation for storing heat in the regenerator in an arbitrary time zone and a regenerative cooling operation for cooling the refrigerator with the stored heat. A heat storage temperature detection means for detecting a temperature of the heat storage material; and an operation time detection means for accumulating an operation time of the heat storage fan, wherein a melting temperature of the heat storage material is set to a temperature higher than a freezing room temperature. The load heat quantity to be subjected to the cooling operation is set to all the refrigerating compartments other than the freezing compartment, and the heat storage material temperature is not more than the temperature at which the attached frost is melted by the heat storage temperature detecting means before the start time of the heat storage operation. If the operation time detecting means continuously detects the heat storage fan until an arbitrary time, the heat storage operation is stopped until the temperature of the heat storage material becomes equal to or higher than the temperature at which the attached frost melts. The suspension control of the heat storage is controlled by the operation time of the heat storage fan, so that the heat storage can be naturally defrosted irrespective of the use state of the customer in the daytime.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a refrigeration system diagram of the refrigerator of FIG. 1;

FIG. 3 is an electric circuit diagram of a main part of the refrigerator of FIG. 1;

FIG. 4 is a flowchart of the refrigerator of FIG. 1;

FIG. 5 is a time chart of the day according to the room temperature in FIG.

FIG. 6 is a functional block diagram of a refrigerator according to a second embodiment of the present invention.

FIG. 7 is a flowchart of the refrigerator in FIG. 6;

FIG. 8 is a refrigeration system diagram of a conventional refrigerator.

9 is a side longitudinal sectional view showing the structure of the refrigerator in FIG. 8;

[Explanation of symbols]

 Reference Signs List 8 cooler 31 heat storage device 32 heat storage material 39 heat storage device fan 46 time control means 55 ventilation duct 56 heat storage temperature detection means 68 operation time detection means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-52478 (JP, A) JP-A-6-123539 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25D 16/00 F25B 5/00 F25D 21/06

Claims (2)

(57) [Claims] 1. A refrigeration cycle in which a cooler and a heat accumulator having a heat accumulating material disposed inside a refrigerator compartment are connected in parallel or in series, a regenerator fan for sending out cool air in the regenerator, and the cooler And a ventilation duct communicating the regenerator,
A heat storage operation for storing heat in the heat storage device in an arbitrary time zone, time control means for performing time control of a heat storage cooling operation for cooling the refrigerator by the stored heat, and a heat storage temperature detection for detecting a temperature of the heat storage material Means, the melting temperature of the heat storage material is a temperature higher than the freezing room temperature, the target load heat amount of the heat storage cooling operation is all refrigerator compartments other than the freezer room, the heat storage temperature before the start time of the heat storage operation When the detecting means continuously detects that the temperature of the heat storage material is equal to or lower than the temperature at which the attached frost melts for any number of days, the heat storage operation is performed to melt the frost to which the temperature of the heat storage material is attached. A refrigerator characterized in that it is stopped until the temperature becomes higher. 2. A refrigeration cycle in which a cooler and a heat accumulator having a heat accumulating material disposed inside a refrigerator are connected in parallel or in series, a heat accumulator fan for sending cool air in the heat accumulator, and the cooler. And a ventilation duct communicating the regenerator,
A heat storage operation for storing heat in the heat storage device in an arbitrary time zone, time control means for performing time control of a heat storage cooling operation for cooling the refrigerator by the stored heat, and a heat storage temperature detection for detecting a temperature of the heat storage material Means, and operating time detecting means for integrating the operating time of the regenerator fan, the melting temperature of the heat storage material is higher than the freezing room temperature, the target load heat amount of the heat storage cooling operation is other than freezer room All refrigeration rooms
Before the start time of the thermal storage operation, the thermal storage temperature is detected by the thermal storage temperature detection means that the thermal storage material temperature is equal to or lower than the temperature at which the frost to which the thermal storage material temperature adheres is melted. The refrigerator is characterized in that, if the operation is continuously detected until the operation time detecting means detects the operation, the heat storage operation is stopped until the temperature of the heat storage material becomes equal to or higher than a temperature at which the frost to which the attached heat storage material melts.