JP2009085502A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of surely defrosting a cooler. <P>SOLUTION: This refrigerator 10 comprises a defrosting heater 30 for defrosting the cooler 53 and a cooling time measuring means for measuring a cooling time from a time of the defrosting. The refrigerator is characterized by comprising a defrosting start means for performing, when the cooling time reaches a predetermined time T1, a next defrosting when predetermined requirements for staring defrosting are satisfied and the next defrosting is performed after a predetermined time T2 (T1<T2) is elapsed when the requirements are not satisfied. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigerator, and more particularly to defrosting a cooler.

  Conventionally, a refrigerator performs a defrosting operation in which frost attached to a cooler is defrosted by a defrost heater at a predetermined time. As this defrosting operation, a method is known in which the next defrosting is performed when the accumulated operation time of the compressor has exceeded a predetermined time from the time when the previous defrosting is completed.

  In such a conventional defrosting operation, when it is set not to perform the heater defrosting until the accumulated operation time of the compressor reaches the set time, a large amount of food with a large amount of moisture evaporation is stored. Depending on the use conditions, each cooler may cause frost deterioration. Therefore, there has been proposed one that changes the accumulated operation time of the compressor until the start of the next defrosting based on the number of opening / closing of the refrigerator door and the operation frequency of the compressor (for example, see Patent Document 1).

However, when the operation integration time of the compressor is changed as described above, the actual operation time is the sum of the compressor stop time and operation time under operating conditions where the compressor is difficult to operate, such as when the outside air temperature is low. There is a possibility that the cooler will be in a state of excessive frost, and when it becomes a state of excessive frost, the energization time of the defrost heater becomes longer in order to eliminate this state of overfrost, There is a problem that the rise in the internal temperature increases and the power consumption increases.
JP 2001-215077 A

  This invention is made | formed in view of the said problem, and it aims at providing the refrigerator which can defrost a cooler reliably.

  The refrigerator of the present invention is a refrigerator including a defrost heater for defrosting a cooler and a cooling time measuring means for measuring a cooling time from the time of defrosting, when the cooling time reaches a predetermined time T1. The next defrosting is performed when a predetermined defrosting start condition is satisfied, and the next time after a predetermined time T2 (however, T1 <T2) has elapsed since the defrosting when the defrosting start condition is not satisfied. A defrosting start means for performing the defrosting is provided.

  As described above, in the refrigerator of the present invention, when the cooling time reaches the predetermined time T1, the next defrost is performed when the defrost start condition is satisfied, and the defrost start condition is not satisfied. However, regardless of the length of the cooling time after the cooling time reaches the predetermined time T1, the next defrosting is performed after the predetermined time T2 has elapsed since the previous defrosting, so that the compressor is less likely to be operated. Even if it is under, defrosting of a cooler can be performed reliably.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view of a refrigerator 10 according to the present embodiment, FIG. 2 is a cross-sectional view of the refrigerator 10, FIG. 3 is a diagram illustrating a configuration of a refrigeration cycle 50 of the refrigerator 10, and FIG. 4 is an electrical configuration of the refrigerator 10. FIG.

  As shown in FIGS. 1 and 2, the refrigerator 10 is filled with a foam heat insulating material 16 between the outer box 12 and the inner box 14 to form a heat insulating box body 17, and the interior of the storage room is insulated by a heat insulating partition wall 18. It is divided into an upper refrigerator compartment 20 and a lower frozen space 40.

  The inside of the refrigerator compartment 20 is further divided into three spaces up and down by a ceiling partition plate 21 and a partition plate 22 that also serve as a mounting shelf, and the upper space is a refrigerated storage space 24 provided with a plurality of mounting shelves 23. The middle space is a vegetable storage space 26 in which a drawer-type vegetable container 25 is arranged, and the lower space is a low-temperature storage space 28 in which a low-temperature container 27 whose interior is cooled to about −3 to 0 ° C. is arranged.

  The front opening of the refrigerator compartment 20 is closed in a double door manner by left and right refrigerator compartment doors 20a, 20a rotatably attached to hinges 29, 29 provided in the heat insulation box 17.

  In the freezing space 40 provided in the lower part of the refrigerator compartment 20, an ice making chamber 42 equipped with an automatic ice making device and a temperature switching chamber 44 capable of switching and setting the room temperature are placed right and left just below the heat insulating partition wall 18. A freezing chamber 46 is provided below the ice making chamber 42 and the temperature switching chamber 44. The ice making chamber 42, the temperature switching chamber 44, and the freezing chamber 46 are closed at the front opening by drawer-type doors 42 a, 44 a, 46 a through which the storage containers arranged inside are pulled out in conjunction with the opening operation. The freezer compartment door 46a is provided with a door switch 47 for detecting the open / closed state.

  Then, on the back surfaces of the refrigerating room 20 and the refrigerating space 40, a refrigerating cooler 52 and a refrigerating cooler 53, and a refrigerating fan 54 and a refrigerating fan 55 corresponding to each cooler, respectively, are disposed. The cool air generated by the coolers 52 and 53 is introduced into the respective storage chambers via the ducts by the fans 54 and 55 and cooled. A defrost heater 30 made of a glass tube heater is provided below the refrigeration cooler 53.

  The duct 32 for sending cool air on the back of the refrigerator compartment 20 is provided with a refrigerator temperature sensor 34 for measuring the internal temperature of the refrigerator compartment 20. A freezer temperature sensor 48 for measuring the internal temperature of 46 is provided. In addition, a defrost sensor 49 for detecting the temperature of the cooler 53 and detecting the end timing of the defrost is provided above the freezer cooler 53.

  The refrigeration cooler 52 and the refrigeration cooler 53 are alternately supplied with refrigerant discharged from a variable capacity compressor 56 by frequency conversion by an inverter provided in the lower part of the refrigerator 10 by a refrigeration cycle 50 as shown in FIG. Guided and cooled.

  That is, in the refrigeration cycle 50, a condenser 58 is connected to the discharge side of the compressor 56, and a three-way valve 60 is connected to the condenser 58. A refrigerating cooler 52 is connected to one of the refrigerant flow paths divided from the three-way valve 60 via a refrigerating chamber capillary tube 62, and the refrigerating cooler is connected to the other refrigerant flow path via a refrigerating capillary tube 64. 53 is connected, and by switching the three-way valve 62, the refrigerant liquefied by the condenser 58 is diverted to the refrigeration cooler 52 side and the refrigeration cooler 53 side. The refrigerant supply to is cut off. Further, the coolers 52 and 53 and the suction side of the compressor 56 are connected, and the refrigerant flowing through the coolers 52 and 53 is again taken into the compressor 56 and circulates through the refrigeration cycle 50.

  Further, as shown in FIG. 4, the control unit 66 disposed at the lower back of the heat insulation box 17 includes a defrost heater 30, a refrigerator temperature sensor 34, a door switch 47, a freezer temperature sensor 48, The motors of the defrost sensor 49, the refrigerator fan 54, the freezer fan 55, and the compressor 56 are connected and controlled by the control unit 66, and the number of times the freezer door 46a is opened and closed and the opening time are integrated and compressed. The operation status of the motor of the machine 56 is stored. The controller 66 is connected to an outside air temperature sensor 68 so as to measure and store the temperature outside the refrigerator.

  The refrigeration cycle 50 of the refrigerator 10 is operated by switching between a refrigeration mode in which the refrigerant flows to the refrigeration cooler 52 side and a refrigeration mode in which the refrigerant flows only to the refrigeration cooler 53.

  Specifically, when the refrigerator compartment 20 is cooled, the three-way valve 60 is switched so that the refrigerant flows through the refrigerator refrigerator 52 and the refrigerator fan 54 is operated. Thus, the air cooled by the refrigeration cooler 52 is blown to the refrigeration chamber 20 by the refrigeration fan 54 to cool the inside of the refrigeration chamber 20.

  When it is desired to cool the refrigeration space 40 such as the freezer compartment 46, the three-way valve 60 is switched so that the refrigerant flows into the refrigeration cooler 53 and the refrigeration mode for operating the refrigeration fan 55 is executed. Thus, the air cooled by the refrigeration cooler 53 is blown into the refrigeration space 40 by the refrigeration fan 55, and the inside of the refrigeration space 40 is cooled.

  Then, the refrigerator 10 is alternately cooled by alternately switching between the refrigeration mode and the freezing mode.

  Next, the defrosting control method of the refrigerator 10 having the above configuration will be described based on the flowchart of the defrosting control method shown in FIG.

  First, in step a1, when the previous defrosting is completed, the process proceeds to step a2.

  In step a2, since the defrosting has been completed, the compressor 56, the refrigeration fan 54 and the refrigeration fan 55 are driven, and the refrigeration mode and the refrigeration mode are alternately switched to start cooling in the cabinet. Go to a3.

  In step a3, the cooling time is the time when the refrigeration mode is executed from the previous defrosting time, in this embodiment, the time when the switching valve 60 is switched and the refrigerant flows through the refrigeration cooler 53 from the end of the previous defrosting. The integration of the time is started and the integration of the actual operation time, which is the time from the time when the previous defrosting is completed, is started, and the process proceeds to step a4.

  In step a4, integration of the number of opening / closing of the freezer compartment door 46a is started, and the process proceeds to step a5.

  In step a5, it is determined whether or not the cooling time has reached a predetermined time T1 (for example, 8.5 hours). If not, this step is continued, and if it has reached, the process proceeds to step a6.

  In step a6, it is determined whether or not the actual operation time has reached a predetermined time T2 (for example, 24 hours). If not, the process proceeds to step a7 where it is determined whether or not the defrosting start condition is satisfied. If it does, it will progress to step a8 which starts a defrost, without determining whether a defrost start condition is satisfy | filled in step a7.

  In step a7, it is determined whether a defrost start condition is satisfied. More specifically, in the present embodiment, when the cooling time reaches the predetermined time T1, it is determined whether or not the number of times of opening and closing the freezer compartment door 46a is greater than a predetermined number N1 (for example, 45 times). If it is N1 or less, the process returns to step a6, and if it is large, it is determined that the defrosting start condition is satisfied, and it is determined that a heavy load is applied to the compressor 32, and the process proceeds to step a8 where defrosting is started.

  In step a8, defrosting is started, the cooling time, the actual operation time, and the open / close count of the freezer compartment door 46a are reset to zero, and the detection temperature of the defrost sensor 49 is equal to or higher than a predetermined temperature (for example, −10 ° C.). If it becomes, it will return to step a1 and will complete | finish defrosting.

  As described above, in the present embodiment, when the door opening / closing frequency is greater than the predetermined number N1, the compressor 56 is high when the door opening / closing frequency is greater than the predetermined frequency N1 as the defrosting start condition when the cooling time reaches the predetermined time T1. It is determined that the load is in a state, defrosting of the refrigeration cooler 53 is started, and when the door opening / closing frequency is equal to or less than the predetermined number N1, it is determined that the load is in a normal load state, and the actual operation time is a predetermined time T2. The defrosting start time for starting the defrosting is extended by alternately switching between the refrigeration mode and the refrigeration mode to cool the interior without defrosting.

  Thus, when the defrost start condition is satisfied and the refrigeration cooler 53 has a large amount of frost formation, defrosting can be started before excessive frost formation on the refrigeration cooler 53 and the defrost start condition is set. Even if it is not satisfy | filled, even if it is the use conditions where it is hard to drive | operate the compressor 56 by performing the next defrost after predetermined time T2 progress from the time of completion | finish of the last defrost, it is the cooler 53 for freezing. It is possible to reliably perform defrosting.

  Moreover, when the cooling time reaches the predetermined time T1, it is determined that the defrosting start condition is not satisfied and the load is normal, and the defrosting start time is extended until the actual operation time reaches the predetermined time T2. However, during this extension, when the door opening / closing frequency exceeds the predetermined number N1 and satisfies the defrosting start condition, the extension is stopped and the defrosting is performed. Even when the chamber door 46a is frequently opened and closed and the refrigeration cooler 53 is used to easily form frost, it can be defrosted before excessive frost formation.

  In addition, in this embodiment, the measurement start timing at the time of defrosting started the integration of the cooling time from the end of the previous defrosting. For example, from the time of the previous defrosting start or the cooling start timing after the defrosting Integration of the cooling time may be started.

(Modification 1)
Next, Modification Example 1 of the present embodiment will be described. In the above embodiment, the time for switching the switching valve 60 and flowing the refrigerant to the refrigeration cooler 53 is set as the cooling time. However, in the first modification, the driving time of the compressor 56 is integrated as the cooling time in Step a3. As described above, even when the driving time of the compressor 56 is set as the cooling time, the refrigeration cooler 53 can be defrosted reliably. For example, the refrigerator 20 and the freezing space 40 are cooled by one cooler. Even in the case of a refrigerator, defrosting of the cooler can be performed reliably.

(Modification 2)
Next, a second modification of the present embodiment will be described. In the above embodiment, the time when the switching valve 60 is switched and the refrigerant is allowed to flow into the refrigeration cooler 53 is the cooling time. However, in the second modification, the switching valve 60 is switched and the coolant is allowed to flow into the refrigeration cooler 52. Accumulate time as cooling time. Thus, by using the time when the refrigeration mode is executed as the cooling time and using the cooling time as the defrosting heater defrosting start condition provided in the refrigeration upper cooler 52, the defrosting of the refrigeration cooler 52 is surely performed. Can be done.

(Modification 3)
Modification 3 of the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the element which is the same as that of above-described embodiment, or the overlapping description is abbreviate | omitted.

  In the present embodiment, the defrosting start condition is determined by the number of times of opening / closing the freezer compartment door 46a. However, in the third modification, the defrosting start condition is determined by whether the freezer compartment door 46a is opened or closed. This is different from the above embodiment.

  That is, in the third modification example, whether or not the freezer compartment door 46a is opened or closed is determined when the cooling time reaches the predetermined time T1 in step a7 of FIG. Returning to step a6, if opening / closing of the refrigerator 46a is detected, the process proceeds to step a8 where defrosting is started.

  Even in the case of this third modification, the refrigeration cooler 53 can be defrosted with certainty.

(Modification 4)
Modification 4 of the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the element which is the same as that of above-described embodiment, or the overlapping description is abbreviate | omitted.

  In the present embodiment, the defrosting start condition is determined based on the number of times the freezer compartment door 46a is opened and closed. However, in the fourth modification, the defrosting start condition is determined based on the total opening time of the freezer compartment door 46a. This is different from the above embodiment.

  That is, in the present modification example 4, in step a4 in FIG. 7, the integration of the open door integration time, which is the time during which the freezer compartment door 46a is opened, is started. In step a7, when the cooling time reaches the predetermined time T1, if the door opening integration time is equal to or shorter than the predetermined time (for example, 700 seconds), the process returns to step a6. It progresses to step a8 which judges that it satisfy | fills, starts defrosting, and resets opening integration time.

  Even in the case of the present modification example 4, defrosting of the refrigeration cooler 53 can be reliably performed.

(Modification 5)
Modification 5 of this embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the element which is the same as that of above-described embodiment, or the overlapping description is abbreviate | omitted.

  In the present embodiment, the defrosting start condition is determined by the number of opening and closing of the freezer compartment door 46a, but in the fifth modification, the defrosting start condition is determined by the opening time of the freezer compartment door 46a. This is different from the above embodiment.

  That is, in the fifth modification example, in step a4 in FIG. 8, measurement of the opening time, which is the time during which the door 46a is opened, is started by one opening operation of the freezer compartment door 46a. In step a7, when the opening time longer than a predetermined time (for example, 60 seconds) is not measured, that is, during the period from the end of the previous defrosting to the time when the cooling time reaches the predetermined time T1, When the opening operation of the freezer compartment door 46a is longer than the predetermined time, the process returns to step a6, and when the opening time longer than the predetermined time is measured even once, the defrost start condition It progresses to step a8 which judges that it satisfy | fills and starts defrosting and resets a door opening time.

  Even in the case of the present modification example 5, defrosting of the refrigeration cooler 53 can be reliably performed.

(Modification 6)
Modification 6 of the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the element which is the same as that of above-described embodiment, or the overlapping description is abbreviate | omitted.

  In the present embodiment, the defrosting start condition is determined by the number of opening and closing of the freezer compartment door 46a. However, the sixth modification is different from the present embodiment in that it is determined by the driving time of the compressor 56. .

  That is, in the present modification example 6, in step a4 of FIG. 9, the integration of the first integration time, which is the time during which the motor of the compressor 56 has been operated at a predetermined frequency F1 (for example, 40 HZ) or higher, is started. In step a7, when the cooling time reaches the predetermined time T1, if the first integrated time is equal to or shorter than the predetermined time (for example, 10 hours), the process returns to step a6. It progresses to step a8 which judges that it satisfy | fills and starts defrosting and resets 1st integration time.

  Even in the case of this sixth modification, the refrigeration cooler 53 can be reliably defrosted.

(Modification 7)
Modification 7 of this embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the element which is the same as that of above-described embodiment, or the overlapping description is abbreviate | omitted.

  In the present embodiment, the defrosting start condition is determined by the number of opening and closing of the freezer compartment door 46a, but the modified example 7 is different from the present embodiment in that it is determined by the driving time of the compressor 56. .

  That is, in this modified example 7, in step a4 of FIG. 10, the integration of the first integration time, which is the time during which the motor of the compressor 56 has been operated at a predetermined frequency F1 (for example, 40HZ) or higher, and the motor of the compressor 56 are predetermined. The integration of the second integration time, which is the time of operation at a frequency F2 (for example, 50HZ) or higher, is started.

  In step a7, when the cooling time reaches the predetermined time T1, if the first integrated time is equal to or shorter than the third predetermined time (for example, 10 hours), the process proceeds to step a9, and the first integrated time is the third predetermined time. If it is longer, the process proceeds to step a8. In step a9, if the second accumulated time is equal to or shorter than a fourth predetermined time (for example, 8 hours), the process returns to step a7. If the second accumulated time is longer than the fourth predetermined time (for example, 10 hours), the process proceeds to step a8. That is, when the cooling time reaches the predetermined time T1, if the first integrated time is not more than the third predetermined time and the second integrated time is not more than the fourth predetermined time, the process returns to step a6, and the first integrated time And if the at least one of the second integrated time is longer than the third predetermined time and the fourth predetermined time set in the first integrated time and the second integrated time, it is determined that the defrosting start condition is satisfied, and the defrosting is performed. The process proceeds to step a8 where the first integrated time and the second integrated time are reset.

  Even in the case of the present modification example 7, defrosting of the refrigeration cooler 53 can be reliably performed.

(Modification 8)
Modification 8 of the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the element which is the same as that of above-described embodiment, or the overlapping description is abbreviate | omitted.

  In the present embodiment, the defrosting start condition is determined by the number of times the freezer compartment door 46a is opened and closed. In the present modified example 8, the defrosting start condition is determined by the outside air temperature that is the temperature outside the refrigerator measured by the outside air temperature sensor 68. This is different from the present embodiment described above.

  That is, in the present modification example 8, in step a4 in FIG. 11, measurement and storage of the outside air temperature is started. In step a7, when the outside air temperature below the predetermined temperature (for example, 33 ° C.) is measured even once by the outside air temperature sensor 68 from the end of the previous defrosting to the time when the cooling time reaches the predetermined time T1. Returns to step a6, and when the outside air temperature measured by the outside air temperature sensor 68 is always higher than the predetermined temperature, it is judged that the defrosting start condition is satisfied, the defrosting is started, and the stored outside air temperature is reset. move on.

  Even in the case of the present modification example 8, defrosting of the refrigeration cooler 53 can be reliably performed.

It is an appearance perspective view of a refrigerator concerning one embodiment of the present invention. It is a longitudinal section of the refrigerator concerning one embodiment of the present invention. It is a figure which shows the refrigerating cycle of the refrigerator which concerns on 1 embodiment of this invention. It is a block diagram which shows the electric constitution of the refrigerator which concerns on one Embodiment of this invention. It is a flowchart which shows the defrost control method of the refrigerator which concerns on 1 embodiment of this invention. It is a flowchart which shows the defrost control method of the refrigerator which concerns on the modification 3 of this invention. It is a flowchart which shows the defrost control method of the refrigerator which concerns on the modification 4 of this invention. It is a flowchart which shows the defrost control method of the refrigerator which concerns on the modification 5 of this invention. It is a flowchart which shows the defrost control method of the refrigerator which concerns on the modification 6 of this invention. It is a flowchart which shows the defrost control method of the refrigerator which concerns on the modification 7 of this invention. It is a flowchart which shows the defrost control method of the refrigerator which concerns on the modification 8 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Refrigerator 17 ... Heat insulation box 20 ... Refrigeration room 30 ... Defrost heater 40 ... Freezing space 46 ... Freezing room 46a ... Freezing room door 53 ... Refrigerating cooler 56 ... Compressor 60 ... Three-way valve

Claims (10)

In a refrigerator comprising a defrost heater for defrosting a cooler and a cooling time measuring means for measuring a cooling time from this defrosting time,
When the cooling time reaches the predetermined time T1, the next defrosting is performed when the predetermined defrosting start condition is satisfied, and when the cooling time has not satisfied the defrosting start condition, the predetermined time from the time of the defrosting is performed. A refrigerator comprising defrosting start means for performing the next defrosting after a lapse of T2 (however, T1 <T2). A refrigerant flow path is configured by connecting a compressor, a refrigeration cooler corresponding to the refrigerator compartment, and a refrigeration cooler compatible with the freezer compartment, and the refrigerant flow path is switched by a valve mechanism, thereby the refrigeration cooler. A refrigerator capable of realizing a refrigeration mode for flowing a refrigerant to a side and a refrigeration mode for flowing a refrigerant to a refrigeration cooler,
In a refrigerator comprising: a defrost heater for defrosting a cooler; and a cooling time measuring means for measuring a cooling time that is a time when the refrigeration mode is executed from the time of this defrosting,
When the cooling time reaches the predetermined time T1, the next defrosting is performed when the predetermined defrosting start condition is satisfied, and when the cooling time has not satisfied the defrosting start condition, the predetermined time from the time of the defrosting is performed. A refrigerator comprising defrosting start means for performing the next defrosting after a lapse of T2 (however, T1 <T2). A door opening and closing measuring means for measuring the number of times the refrigerator door is opened and closed from the time of defrosting,
The defrosting start means performs the next defrosting as the defrosting start condition when the number of times of opening / closing measured by the door opening / closing measuring means is greater than the predetermined number of times when the cooling time reaches a predetermined time T1. The refrigerator according to claim 1, wherein the next defrosting is performed after a predetermined time T <b> 2 has elapsed from the time of the defrosting when the number of times is less than a predetermined number. Comprising a door opening accumulated time measuring means for measuring a door opening accumulated time which is a time when the refrigerator door is opened from the time of defrosting,
When the cooling time has reached a predetermined time T1 as the defrosting start condition, the defrosting start unit is configured such that the integrated opening time measured by the integrated opening time measuring unit is longer than the predetermined time. 3. The refrigerator according to claim 1, wherein the next defrosting is performed, and the next defrosting is performed after a predetermined time T <b> 2 elapses from the time of the defrosting when the time is equal to or less than a predetermined time. Comprising an opening time measuring means for measuring the opening time of the refrigerator door from the time of defrosting,
As the defrosting start condition, the defrosting start means is configured such that the door opening time measuring means opens the refrigerator door once during the period from the defrosting to the time when the cooling time reaches the predetermined time T1. When the opening time is longer than the predetermined time, the next defrosting is performed, and when the opening time of one refrigerator door is not longer than the predetermined time, the predetermined time T2 has elapsed since the defrosting time. The refrigerator according to claim 1 or 2, wherein the next defrosting is performed later. The compressor is a variable capacity compressor whose capacity is variable depending on the operating frequency,
A first integrated time measuring means for measuring a first integrated time during which the compressor is driven at a first frequency or higher from the time of defrosting;
When the cooling time has reached the predetermined time T1 as the defrosting start condition, the defrosting start unit is next time when the first integrated time measured by the first integrated time measuring unit is longer than the predetermined time. The refrigerator according to claim 1 or 2, wherein the next defrosting is performed after a predetermined time T2 has elapsed from the time of the defrosting when the defrosting is performed for a predetermined time or less. The refrigerator according to claim 6,
A second integrated time measuring means for measuring a second integrated time during which the compressor is driven at a second frequency or higher from the time of defrosting;
When the cooling time reaches a predetermined time T1 as the defrosting start condition, the defrosting start unit determines whether the next defrosting start means is the next time when at least one of the first integrated time and the second integrated time is longer than the predetermined time. A refrigerator that performs defrosting, and performs the next defrosting after elapse of a predetermined time T2 from the time of defrosting when the first integrated time and the second integrated time are equal to or shorter than a predetermined time. An outside temperature measuring means for measuring outside temperature is provided,
The defrosting start means is configured such that, as the defrosting start condition, the outside air temperature measured by the outside air temperature measuring means from a predetermined temperature during the period from the defrosting to the time when the cooling time reaches the predetermined time T1. The refrigerator according to claim 1 or 2, wherein the next defrosting is performed when the temperature is high, and the next defrosting is performed after a predetermined time T2 has elapsed from the time of the defrosting when the temperature is equal to or lower than the predetermined temperature. An actual operation time measuring means for measuring an actual operation time which is a time from the defrosting time to the time when the cooling time reaches the predetermined time T1,
The said defrost start means performs the next defrost when the said cooling time reaches | attains the predetermined time T1, when the said actual operation time is longer than the said predetermined time T2. refrigerator.   Even when the defrost start condition is not satisfied when the cooling time reaches the predetermined time T1, the next time when the defrost start condition is satisfied before the predetermined time T2 elapses from the defrost time. The refrigerator according to claim 1, wherein defrosting is performed.

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