JP2004076995A - Refrigerator and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-cooled refrigerator having an evaporator for evaporating refrigerant and a fan for circulating nearby cold air through the refrigerator and operated to remove frost clinging to the evaporator or nearby portions, and its control method, while omitting a heating means for defrosting at the position of the evaporator for a cold storage area, thereby ensuring defrosting while providing a simplified structure and achieving a reduction in manufacturing cost and power saving. <P>SOLUTION: Air blowing is continued by a fan 25 for the cold storage area until the surface of the evaporator 15 for the cold storage area reaches a temperature of 3°C, even after a cold storage area cooling mode for circulating the refrigerant through the evaporator 15 has ended. At appropriate time intervals, e.g., once every twenty hours, the air blowing is continued until the surface of the evaporator 15 reaches a temperature of 5°C after the cold storage area cooling mode has ended. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides an air-cooled refrigerator including an evaporator for vaporizing a refrigerant and a blower for circulating cool air in the vicinity of the evaporator in the refrigerator, and performing an operation of removing frost attached to the evaporator or the vicinity thereof, and a refrigerator thereof. It relates to a control method. In particular, the first and second evaporators are connected to one compressor via a condenser and a switching valve, and the switching valve performs a cooling operation using the first evaporator and a cooling operation using the second evaporator. And that switching is alternately performed between
[0002]
[Prior art]
When a refrigerator or a freezer is cooled by an evaporator that vaporizes a refrigerant, moisture in the storage chamber causes frost on the surface of the evaporator or in the vicinity thereof. For defrosting to remove this frost, a heating means such as an electric heater is provided in the vicinity of the evaporator. When performing defrosting, after stopping the flow of the refrigerant into the evaporator, the heating means (For example, JP-A-2000-88439, JP-A-2001-27471).
[0003]
A type in which a refrigerator compartment evaporator for cooling a refrigerator compartment such as a refrigerator compartment or a vegetable compartment and a freezer compartment evaporator for cooling a freezer compartment such as a freezer compartment or an ice making compartment are separately provided. In the refrigerators described above, heating means such as an electric heater are provided for each evaporator, and each evaporator is defrosted.
[0004]
[Problems to be solved by the invention]
In the conventional refrigerator and defrosting method as described above, since it is necessary to provide a heating means such as an electric heater for each evaporator, the cost and the number of members are required, and energy for heating is consumed. This is contrary to the demand for energy saving.
[0005]
However, from years of experience, it has been considered difficult to perform reliable defrosting without such a heating means.
[0006]
The inventors of the present invention have conducted intensive studies in view of the above problems, and as a result, if the operation control method is significantly improved, a separate heating means is omitted for an evaporator for a refrigerated compartment in which the storage room has a freezing point or higher. Has come to the conclusion that it is possible.
[0007]
The present invention provides an air-cooled refrigerator including an evaporator for vaporizing a refrigerant and a blower for circulating cool air in the vicinity of the evaporator in the refrigerator, and performing an operation of removing frost attached to the evaporator or the vicinity thereof, and a refrigerator thereof. In the control method, omitting the heating means for defrosting at the location of the evaporator for the refrigerated compartment, it is possible to reliably defrost while realizing the simplification of the structure, the reduction of the manufacturing cost, and the power saving. I will provide a.
[0008]
[Means for Solving the Problems]
The refrigerator of the present invention has a compressor, and first and second evaporators connected to the compressor via a condenser and a switching valve. The operation is alternately switched between a first cooling operation mode for cooling the storage compartment and a second cooling operation mode for cooling the second storage compartment. A refrigerator provided with a first blower for circulating cold air in the first storage compartment and a first evaporator temperature sensor for detecting a temperature of the surface or the inside of the evaporator, After the end of the operation mode, the operation of the first blower is continued until the temperature detected by the first evaporator temperature sensor rises and reaches a first set value exceeding the freezing point, and the first storage is performed. The surface of the first evaporator is supplied by heat supplied by air circulation in the compartment. And removing the frost on the beauty vicinity.
[0009]
With the above configuration, defrosting can be reliably performed while simplifying the structure, reducing manufacturing costs, and saving power.
[0010]
The refrigerator of the present invention is particularly provided with a first storage section temperature sensor for detecting a temperature in the first storage section, and a temperature detected by the first storage section temperature sensor and the first evaporator. The start of the first cooling operation mode is determined based on the temperature detected by the temperature sensor.
[0011]
With such a configuration, the cooling operation can be performed immediately after the completion of the defrosting and when the cooling needs to be started.
[0012]
Preferably, every time the first cooling operation mode is ended, while performing a first defrosting operation of continuing the operation of the blower until the first set value is reached, every time a predetermined integrated operation time elapses, or Each time the first cooling operation mode is repeated a specific number of times, after the first cooling operation mode ends, the temperature detected by the first evaporator temperature sensor is higher than the first set value. Until the second set value is reached, a second defrosting operation is performed to further continue the blowing by the first blower.
[0013]
With such a configuration, more reliable defrosting can be performed.
[0014]
More preferably, during the second defrosting operation, when the temperature detected by the first storage compartment temperature sensor reaches a set temperature instructing the start of the first cooling operation mode, the first blower is reversed. The first cooling operation mode is started after the air is blown by rotating.
[0015]
This makes it possible to suppress the temperature rise in the storage compartment while continuing the defrosting operation until the attached frost is completely removed.
[0016]
In addition, when the first evaporator temperature becomes equal to or lower than a predetermined value near the freezing point in the second cooling operation mode or when the operation of the compressor is stopped, the operation of the first blower is restarted.
[0017]
This prevents the evaporator from being excessively cooled and forming frost when there is a leakage of refrigerant (valve leakage) from the path that should have been blocked by the switching valve.
[0018]
According to another preferred aspect of the present invention, when one operation time of the first cooling operation mode and one operation time of the second cooling operation mode are set in advance and the operation is switched alternately, In the operation in the first cooling operation mode, the temperature detected by the first evaporator temperature sensor is equal to or higher than a predetermined value even after a lapse of a predetermined duration of the first cooling operation mode, and When the inside temperature detected by the storage compartment temperature sensor is higher than the set temperature at which the cooling operation is instructed to stop, the operation in the first cooling operation mode is further continued for a predetermined extension time.
[0019]
With such a configuration, an efficient cooling operation can be performed while reliably preventing the temperature in the refrigeration compartment from becoming excessively high.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0021]
FIG. 1 is a flowchart showing the operation control of the refrigerator, and FIG. 2 is a schematic diagram for explaining the basic configuration of the refrigerator and the refrigerant flow path.
[0022]
As shown in FIG. 2, a compressor 11 is disposed at a lower rear portion of the refrigerator 1, and a three-way switching valve 13 is connected from a discharge port of the compressor 11 via a condenser 12. The first outlet of the switching valve 13 is connected to the evaporator 14 for the freezing compartment, and the second outlet of the switching valve 13 is connected to the evaporator 15 for the refrigeration compartment via a capillary tube. A control unit 16 for performing operation control of the compressor 11, operation control of the switching valve 13, and the like is disposed on the upper rear side of the refrigerator.
[0023]
Further, the evaporator 14 for the freezing compartment and the evaporator 15 for the refrigerated compartment are provided with temperature sensors 14a and 15a for detecting the surface temperature, for example, near the refrigerant introduction port, and the control unit 16 is electrically connected via signal transmission wiring. Connected. These temperature sensors 14a and 15a may detect the temperature inside the evaporators 14 and 15, or may be arranged at appropriate places away from the refrigerant inlet.
[0024]
Further, a freezing compartment temperature sensor 17 for detecting the temperature of a predetermined location in the freezing compartment 21 and a refrigeration compartment temperature sensor 18 for detecting the temperature of a predetermined location in the refrigeration compartment 22 are provided along the inner wall of the refrigerator, It is electrically connected to the control unit 16.
[0025]
In addition, adjacent to the freezer compartment evaporator 14 and the refrigerated compartment evaporator 15, a freezer compartment blower 24 and a refrigerated compartment blower 25 for circulating cold air in the respective storage compartments 21 and 22 are arranged, respectively. ing. In addition, a blower 23 that dissipates heat in the machine room is arranged adjacent to the compressor 11. The operation of these blowers is also controlled by the control unit 16 (FIGS. 2 and 3).
[0026]
As shown in the control block diagram of FIG. 3, the control unit 16 is further provided with an integrated time timer 19 for notifying the integrated operation time.
[0027]
As shown in the flowchart of FIG. 1, the end of the operation mode for cooling the refrigeration section 22 and the subsequent defrosting operation are performed as follows. Here, for the sake of simplicity, it is assumed that starting from the refrigerated compartment cooling mode, the refrigerated compartment cooling mode is terminated only by switching to the frozen compartment cooling mode.
[0028]
(1) End of refrigerated compartment cooling mode (switch to frozen compartment cooling mode)
First, it is determined whether or not the temperature T2 detected by the temperature sensor 18 in the refrigeration section is lower than a set lower limit (refrigeration / cooling stop temperature T2-off) (step a1). If the temperature T2 in the refrigerating compartment is lower than the refrigerating / cooling stop temperature T2-off, there is no need for further cooling, so the process proceeds to step a2. If it is determined that the temperature has not dropped, the process proceeds to step a3.
[0029]
In step a2, the switching valve 13 is switched so that the refrigerant flows to the freezing compartment evaporator 14 side. That is, switching to the freezing compartment cooling mode is performed.
[0030]
On the other hand, in step a3, it is determined whether or not the duration t1 of the operation in the refrigerator compartment cooling mode has exceeded the set duration t1max. For example, it is determined whether or not the integrated operation time of the cooling operation (refrigerant circulation operation) after switching to the refrigerated compartment cooling mode has exceeded 20 minutes. If it is determined that it has exceeded, the process proceeds to step a4, and if it is determined that it has not exceeded, the process returns to step a1.
[0031]
In step a4, it is determined whether the temperature T2a detected by the temperature sensor 15a on the surface of the refrigerator compartment evaporator 15 is lower than a set lower limit (cooling stop temperature T2a-off). When the evaporator temperature T2a is lower than the cooling stop temperature T2a-off, the cooling of the refrigerating compartment evaporator 15 does not need to be further performed, so the process proceeds to step a2 to switch to the freezing compartment cooling mode. If it is determined that the evaporator temperature T2a is not lower than the cooling stop temperature T2a-off, the process proceeds to step a5.
[0032]
In step a5, it is determined whether or not the temperature T1 detected by the freezing section temperature sensor 17 exceeds a set upper limit value (freezing / cooling start temperature T1-on). When the temperature T1 in the freezing section exceeds the freezing / cooling start temperature T1-on, the cooling of the freezing section should be started immediately, so that the process proceeds to step a2 to switch to the freezing section cooling mode. . If it is determined that it has not exceeded, the process proceeds to step a6.
[0033]
In step a6, it is determined whether or not the duration t1 of the operation in the refrigerated compartment cooling mode has exceeded the extension set duration t1max '. For example, it is determined whether or not a set upper limit of 30 minutes, which is longer than the above 20 minutes, is exceeded. If it is determined that the operation duration t1 has exceeded the extension set duration t1max ', the operation proceeds to step a2 to perform operation switching, and if it is determined that the operation duration has not exceeded, the operation returns to step a1.
[0034]
(2) After switching to the refrigerated compartment cooling mode in the extended operation step a2 of the refrigerated compartment blower 25, it is determined whether the extended operation of the blower 25 is to be performed in the normal mode or the "high-temperature shift" mode. (Step b1). The details of this determination will be described later. When the operation is performed in the normal mode, the process proceeds to step b2 to continue the air blowing operation. When the operation is performed in the “high temperature shift” mode, the operation proceeds to step b5, and the air blowing operation is similarly continued.
[0035]
In step b3 following step b2, it is determined whether the temperature T2a detected by the refrigerator compartment evaporator temperature sensor 15a is lower than 3 ° C., and if it is determined that the temperature T2a is lower than 3 ° C., the process proceeds to step b2. Return and continue the blow operation. If the temperature is lower than 3 ° C., frost may remain, and even if the blowing operation is continued, the temperature in the refrigeration compartment does not rise.
[0036]
If it is determined in step b3 that the temperature T2a is equal to or higher than 3 ° C., the process proceeds to step b4, in which the blowing operation of the refrigerating compartment blower 25 is stopped.
[0037]
This is shown by the schematic graph of FIG. The vertical axis is the temperature T2a detected by the refrigerator compartment evaporator temperature sensor 15a, and the horizontal axis is the passage of time.
[0038]
During the operation in the refrigerated compartment cooling mode, the evaporator temperature T2a is about −20 ° C., but after finishing the refrigerated compartment cooling mode, the temperature gradually rises and stabilizes at 0 ° C. for a while. Then, when this temperature change passes a flat state, the temperature rises linearly as blowing continues.
[0039]
This is because the temperature change becomes flat until most of the frost attached to the surface of the refrigerator compartment evaporator 15 and its vicinity melts, and then rises. When the evaporator temperature T2a reaches 3 ° C., most of the frost in the refrigeration compartment evaporator 15 and its vicinity is melted.
[0040]
The water that comes out of the melting of the frost volatilizes in the refrigeration compartment with the air circulation by the blower 25. Therefore, since the inside of the refrigerated compartment 22 can be made high in humidity, drying of stored food can be suppressed and freshness of the food can be maintained.
[0041]
FIG. 5 shows a graph similar to FIG. 4 for a comparative example in which the blower 15 was stopped while the temperature T2a on the surface of the refrigeration compartment evaporator 15 was still at the freezing point. In the comparative example of FIG. 5, since the blower 15 is stopped in a state where defrosting is only partially performed, a separate defrosting operation is required.
[0042]
(3) Periodical high-temperature shift of the ventilation stop temperature (3 ° C → 5 ° C)
In order to perform defrosting of the refrigerator compartment evaporator 15 more reliably, the blowing stop temperature is periodically shifted from 3 ° C. to 5 ° C.
[0043]
Specifically, in the above step b1, it is determined whether or not the time t2 obtained by integrating the operation times in the refrigerated compartment cooling mode after the previous "high temperature shift" is equal to or less than the set high temperature shift cycle t2max. The set high-temperature shift cycle t2max is set to, for example, the same time as the defrosting operation cycle of the evaporator 14 for the freezing compartment, and the high-temperature shift can be performed at the same time as the defrosting operation.
[0044]
Defrosting of the freezing compartment evaporator 14 is performed by an electric heater attached to the freezing compartment evaporator 14, for example, at a cycle of 20 hours.
[0045]
If it is determined in step b1 that the integrated operation time t2 has exceeded the set high-temperature shift cycle t2max, the integrated operation time t2 is initialized to a zero value (step b5), and the blow stop temperature is set to 5 ° C. After that, the same processing as the above steps b2 to b4 is performed (steps b6 to b7). That is, after the blower 25 continues blowing, when the evaporator temperature T2a reaches 5 ° C., the operation of the blower 25 is stopped.
[0046]
However, in a state in which the air supply stop temperature is shifted to 5 ° C., the temperature in the refrigeration compartment 22 may become excessively high. Therefore, the temperature T2 detected by the refrigeration compartment temperature sensor 18 is the refrigeration compartment cooling start temperature. If it is determined that T2-on has been reached, the blower 25 is rotated in the reverse direction (steps b8 to b9). Thus, reliable defrosting can be performed while avoiding a temperature rise in the refrigeration section 22.
[0047]
(4) Switching to Refrigeration Compartment Cooling Mode First, it is determined whether the temperature T1 detected by the temperature sensor 17 in the freezing compartment is lower than a set lower limit (refrigeration / cooling stop temperature T1-off) (step c1).
[0048]
If it is determined that the freezing compartment temperature T1 is lower than the freezing / cooling stop temperature T1-off, the process proceeds to step c2, and if it is determined that the temperature is not lower, the process proceeds to step c3.
[0049]
In step c2, it is determined whether or not the temperature T2a detected by the temperature sensor 15a on the surface of the refrigerator compartment evaporator 15 exceeds 3 ° C.
[0050]
When the temperature exceeds 3 ° C., the process proceeds to step c5, and the mode is switched to the refrigeration compartment cooling mode. At the same time as this switching, the operation of the refrigerated compartment blower 25 is started.
[0051]
That is, when the inside of the freezing compartment is sufficiently cooled and the cooling of the refrigeration compartment 22 must be first performed by cooling the evaporator 15 for the refrigeration compartment, Switch to mode.
[0052]
As shown in FIG. 4, at the start of the operation in the refrigerated compartment cooling mode, the temperature T2a of the refrigerator evaporator 15 has risen to 3 ° C., so starting from this temperature to −20 ° C. Is performed. On the other hand, in the case of the comparative example of FIG. 5, the temperature T2a of the refrigerator evaporator 15 starts from the freezing point and drops.
[0053]
On the other hand, if the temperature T2a does not exceed 3 ° C., the process returns to step c1.
[0054]
In step c3, which branches off from step c1, it is determined whether or not the duration t3 of the operation in the freezing compartment cooling mode has exceeded the set duration t3max. That is, after the operation is switched, it is determined whether or not the integrated time of the operation in the freezing compartment cooling mode has exceeded the set duration t3max. The set duration t3max is set to, for example, 40 minutes.
[0055]
If the accumulated operation time after switching to the freezing section cooling mode exceeds the set duration time t3max, the inside of the freezing section has already been sufficiently cooled, so that the operation proceeds to step c5 and the operation is switched. If it is determined that it has not exceeded, the process proceeds to step c4.
[0056]
In step c4, it is determined whether or not the temperature T2 detected by the refrigeration section temperature sensor 18 exceeds a set upper limit value (refrigeration / cooling start temperature T2-on). When it is determined that the temperature T2 in the refrigeration section has exceeded the refrigeration cooling start temperature T2-on, that is, when it is necessary to cool the refrigeration section immediately, the process proceeds to step c2, and when it is determined that the temperature does not exceed the temperature. Returns to step c1.
[0057]
(5) Resumption of Ventilation by Detecting Leakage Even after the extended operation of the refrigeration compartment blower 25 is once terminated, the surface temperature T2a of the refrigeration compartment evaporator 15 may drop to a value near the freezing point. This is because so-called "valve leakage" occurs in which a small amount of refrigerant flows into the refrigeration compartment evaporator 15 at the switching valve 13 due to insufficient blockage on the side of the refrigeration compartment evaporator 15.
[0058]
In the state where the valve leaks, there is a possibility that the refrigeration compartment blower 25 is again frosted. Therefore, when the phenomenon that the surface temperature T2a of the refrigerator compartment evaporator 15 decreases is detected, the operation of the refrigerator compartment blower 25 is restarted.
[0059]
When the blower 25 is operated at the time of valve leakage in this way, it is possible to cool the refrigeration compartment, which leads to improvement in the cooling efficiency of the refrigerator.
[0060]
(6) Temporary Stop of Refrigerant Circulation Although the description has been omitted above, the operation of the compressor 11 is temporarily stopped and restarted as appropriate. That is, when the inside of the refrigeration compartment and the inside of the freezing compartment are sufficiently cooled and each evaporator is also sufficiently cooled, the circulation of the refrigerant is temporarily stopped.
[0061]
Therefore, the same applies to the case where the refrigerant circulation is temporarily stopped after the end of the refrigeration mode and the extended operation of the refrigerator air blower 25 is performed during the temporary stop of the refrigerant circulation. Further, the same applies to the case where the switching from the temporarily stopped state of cooling to the freezing / cooling mode is performed during the extended operation of the refrigerator compartment blower 25, or the reverse is performed.
[0062]
The suspension of the refrigerant circulation is performed, for example, when the following condition (1) is satisfied and any of the following conditions (2) -1 to (2) -3 is satisfied.
[0063]
{Circle around (1)} The temperature T1 detected by the freezing compartment temperature sensor 17 is lower than a set lower limit (freezing / cooling stop temperature T1-off). That is, the inside of the freezing compartment is already sufficiently cooled.
[0064]
{Circle around (2)}-1: The temperature T2 detected by the refrigeration section temperature sensor 18 is equal to or lower than a set lower limit value (refrigeration / cooling stop temperature T2-off). That is, the inside of the freezing compartment is already sufficiently cooled.
[0065]
{Circle around (2)}-2: The temperature T2 detected by the refrigerating compartment temperature sensor 18 is equal to or lower than a set upper limit value (refrigerative cooling start temperature T2-on), and the operating frequency P of the compressor 11 is in the lowest range. That is, although the temperature in the refrigerated compartment has not reached the temperature at which the cooling should be stopped, only the lowest level of cooling is performed, and it is considered that the temperature does not rise much for a while even after the cooling is stopped.
[0066]
{Circle around (2)}-3: The temperature T2a detected by the temperature sensor 15a on the surface of the refrigerating compartment evaporator 15 is equal to or lower than a set upper limit value (refrigerative cooling start temperature T2a-on). That is, the temperature of the refrigeration compartment evaporator 15 is low enough to cool the inside of the refrigeration compartment.
[0067]
In the above embodiment, the description has been made assuming that the refrigerant is alternately supplied to the two evaporators for the freezing compartment and the refrigerating compartment by one compressor. However, an evaporator may be provided in each of a plurality of refrigeration compartments, and in this case, it is possible to omit all the electric heaters for defrosting.
[0068]
In the above embodiment, the description has been made assuming that four temperature sensors are arranged so as to detect the temperature in each evaporator and each storage compartment. However, in some cases, any one of them can be omitted. More temperature sensors can be used. Further, although the description has been made on the assumption that the temperature of the surface of the evaporator is detected, the temperature of the inside of the evaporator may be detected.
[0069]
【The invention's effect】
By omitting the heating means for defrosting at the location of the evaporator, the structure can be simplified, the manufacturing cost can be reduced, and power consumption can be reduced.
[Brief description of the drawings]
FIG. 1 is a flowchart showing operation control of an embodiment.
FIG. 2 is a schematic diagram showing only a basic configuration of a refrigeration cycle and a refrigerator.
FIG. 3 is a schematic block diagram illustrating a basic configuration of a control device according to the embodiment.
FIG. 4 is a graph depicting the change over time in the temperature of the evaporator for a refrigerated compartment for an example.
FIG. 5 is a graph similar to FIG. 4 for a comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Refrigerator 11 Compressor 13 Switching valve 14, 15 Evaporator 16 Control part 14a, 15a, 17, 18 Temperature sensor

Claims (8)

A first and second evaporator connected to the compressor via a condenser and a switching valve, the first and second evaporators being set to a temperature equal to or higher than the freezing point by switching the refrigerant flow path by the switching valve; The operation is alternately switched between a first cooling operation mode for cooling the storage compartment and a second cooling operation mode for cooling the second storage compartment,
The first evaporator includes a first blower for circulating cool air near the evaporator into the first storage compartment, and a first evaporator temperature for detecting a temperature of the surface or the inside of the evaporator. In a refrigerator provided with a sensor,
After the end of the first cooling operation mode, the operation of the first blower is continued until the temperature detected by the first evaporator temperature sensor rises and reaches a first set value exceeding the freezing point, Refrigerator characterized by removing frost adhering to the surface of the first evaporator and its vicinity by heat supply by air circulation in the first storage compartment. A first storage section temperature sensor for detecting a temperature in the first storage section; and a temperature detected by the first storage section temperature sensor and a temperature detected by the first evaporator temperature sensor. The refrigerator according to claim 1, wherein the start of the first cooling operation mode is determined on the basis of the first cooling operation mode. Each time the first cooling operation mode ends, while performing a first defrosting operation to continue the operation of the blower until reaching the first set value,
The temperature detected by the first evaporator temperature sensor after the end of the first cooling operation mode every time a predetermined integrated operation time elapses or each time the first cooling operation mode is repeated a specific number of times. The refrigerator according to claim 1, wherein a second defrosting operation is further performed to further continue blowing by the first blower until a second set value higher than the first set value is reached. The second evaporator is provided with a heater for defrosting on or near the surface of the evaporator, and performs a heating operation by the heater for removing frost on or near the surface of the second evaporator. 4. The refrigerator according to claim 3, wherein the second defrosting operation is performed every time, or during the heating operation and during a specific number of times of the second cooling operation mode during the heating operation. 5. During the second defrosting operation, when the temperature detected by the first storage compartment temperature sensor reaches a set temperature for instructing the start of the first cooling operation mode, the first blower is rotated in the reverse direction to blow air. 5. The refrigerator according to claim 3, wherein the first cooling operation mode is started after that. When in the second cooling operation mode or when the operation of the compressor is stopped, if the first evaporator temperature becomes equal to or lower than a predetermined value near the freezing point, the operation of the first blower is restarted. The refrigerator according to claim 1, wherein When one operation time of the first cooling operation mode and one operation time of the second cooling operation mode are set in advance and the operation is switched alternately,
In the operation in the first cooling operation mode, the temperature detected by the first evaporator temperature sensor is equal to or higher than a predetermined value even when a predetermined duration of the first cooling operation mode has elapsed, and the first storage operation is performed. The operation in the first cooling operation mode is further continued for a predetermined extension time when the inside temperature detected by the section temperature sensor is higher than a set temperature for instructing a stop of the cooling operation. The refrigerator as described. A compressor having a first and a second evaporator connected to the compressor via a condenser and a switching valve, and switching the refrigerant flow path by the switching valve to cool the first storage compartment; The operation switching is alternately performed between the 1 cooling operation mode and the second cooling operation mode for cooling the second storage section,
The first evaporator includes a first blower for circulating cool air near the evaporator into the first storage compartment, and a first evaporator temperature for detecting a temperature of the surface or the inside of the evaporator. In a control method of a refrigerator provided with a sensor,
After the end of the first cooling operation mode, the operation of the first blower is continued until the temperature detected by the first evaporator temperature sensor rises and reaches a first set value exceeding the freezing point, A method for controlling a refrigerator, comprising removing frost adhering to the surface of the first evaporator and the vicinity thereof by heat supply by air circulation in a first storage compartment.

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