KR100215061B1 - Refrigerator defrost operating method - Google Patents

Abstract

The present invention relates to a defrosting operation method of a refrigerator, which drives a compressor according to a temperature set by a user, drives a fan after a predetermined time has passed after the compressor is driven, and checks the temperature of the evaporator before and after the fan is driven. By sensing the amount of frost formed on the evaporator and defrosting the evaporator accordingly, it is possible to prevent the temperature in the refrigerator from rising due to the large amount of frost formed on the evaporator and to prevent cooling of the refrigerator. It is to improve the efficiency.

Description

How to defrost refrigerator

The present invention relates to a defrosting operation method of the refrigerator, and more particularly, by checking the temperature difference between the evaporator before and after the fan drive to detect the amount of frost formed on the evaporator, and accordingly defrosting the evaporator to improve the cooling efficiency of the refrigerator. It relates to a defrosting operation method of the refrigerator to be improved.

In general, as shown in FIG. 1, the refrigerator includes a freezing chamber 5 and a refrigerating chamber 7 which store foods separated by an intermediate wall member 3 in the upper and lower portions as shown in FIG. 1. The front surface of (1) is equipped with a freezer compartment door 8 for opening and closing the freezer compartment 5 and a refrigerating compartment door 9 for opening and closing the refrigerating compartment 7, respectively.

In addition, the freezer compartment evaporator 10 is mounted on the rear surface of the freezer compartment 5 to exchange heat to the cold air by the latent heat of evaporation of the refrigerant to the cold air, that is, the cold compartment, and an upper side of the freezer compartment evaporator 10. The freezer compartment fan 13 which rotates in accordance with the drive of the freezer compartment fan motor 11 which circulates the cold air heat-exchanged by the 10 to the said freezer compartment 5 is attached.

In addition, a first duct on the left side of the freezer compartment evaporator 10 guides the flow of cold air to circulate the cold air heat exchanged by the freezer compartment evaporator 10 into the freezer compartment 5 by the rotational force of the freezer compartment fan 13. The member 15 is mounted, and the rear wall of the freezer compartment 5 is heat-exchanged by the freezer compartment evaporator 10 so that the cold air guided along the first duct member 15 is discharged into the freezer compartment 5. The first cold air discharge port 17 is formed.

And, one side of the freezer compartment evaporator (10) is equipped with a freezer compartment evaporator temperature sensor (57) for sensing the temperature of the freezer compartment evaporator (10), while the air blown by the freezer compartment fan (13) 10) is equipped with a freezer compartment heater 19 which generates heat so that dew (frost) formed on the freezer compartment evaporator 10 is removed by cold air discharged to the outside when it is cooled by heat exchange by the latent heat of evaporation of the refrigerant. have.

In addition, the lower side of the freezer compartment evaporator 10 is provided with water in the air generated when cooling the air blown by the freezer compartment evaporator 10 in accordance with the operation of the freezer compartment 13, that is, defrost water. The first evaporation receiver 23 is collected and drained to the evaporation plate 21 installed at the lower end of the main body 1 through the drain hose 20, and the upper portion of the rear surface of the freezer compartment 5 is On the left side of the freezer compartment fan 13, a freezer compartment temperature sensor 54 for sensing a temperature in the freezer compartment 5 is mounted.

The refrigerator compartment evaporator 27 is mounted on a rear surface of the refrigerating compartment 7 to exchange heat from the blown air with cold air, ie, cold air, by the latent heat of evaporation of the refrigerant, and an upper side of the refrigerator compartment evaporator 27. The refrigerator compartment fan 30 which rotates in accordance with the drive of the refrigerator compartment fan motor 29 so that the cold air heat-exchanged by 27 is circulated to the refrigerator compartment 7 is attached.

In addition, on the left side of the refrigerating chamber evaporator 27, a second duct for guiding the flow of cold air to circulate the cold air heat exchanged by the refrigerating chamber evaporator 27 into the refrigerating chamber 7 by the rotational force of the refrigerating chamber fan 30. The member 31 is mounted and heat exchanged by the refrigerating chamber evaporator 27 to the rear wall of the refrigerating chamber 7 so that the cold air guided along the second duct member 31 is discharged into the refrigerating chamber 7. The second cold air discharge port 33 is formed.

In addition, one side of the refrigerator compartment evaporator 27 is equipped with a refrigerator compartment evaporator temperature sensor 58 that detects the temperature of the refrigerator compartment evaporator 27, and the air blown by the refrigerator compartment fan 30 is stored in the refrigerator compartment evaporator. In (27), the refrigerator compartment heater 35 is configured to generate heat such that dew (frost) formed on the refrigerator compartment evaporator 27 is removed by cold air discharged to the outside when cooling by heat exchange by the latent heat of evaporation of the refrigerant. It is.

In addition, the lower side of the refrigerating chamber evaporator 27 provides moisture in the air generated when the air blown in accordance with the operation of the refrigerating chamber fan 30 in the refrigerating chamber evaporator 27 is cooled, that is, defrost water. A second evaporation receiver 37 is installed to collect the water and drain it to the evaporating dish 21 installed at the lower end of the main body 1 through the drain hose 20, and the lower portion of the rear side of the refrigerating chamber 7 is provided. On the left side of the refrigerating chamber evaporator 27, a refrigerating chamber temperature sensor 55 for detecting a temperature in the refrigerating chamber 7 is mounted.

In addition, the lower end of the main body 1 is equipped with a compressor 40 for compressing the low temperature low pressure gas refrigerant cooled in the freezer compartment evaporator 10 and the refrigerating chamber evaporator 27 to a high temperature and high pressure gas state. On the rear side of (1), the main condenser 41 which heat-exchanges the high-temperature, high-pressure gas refrigerant compressed by the compressor 40 by natural convection or forced convection with external air, forcibly cools the liquid refrigerant with low-temperature and high pressure, and liquefies it. ) Is installed.

In addition, an auxiliary accumulator 43 for evaporating the defrost water collected in the evaporation plate 21 is mounted at the lower end of the evaporation plate 21, and an inner space is provided in the freezer compartment 5 and the refrigerating compartment 7. A plurality of shelf members 45 are mounted to support the stored food by dividing into pieces.

In the conventional refrigerator configured as described above, when the temperature of the freezer compartment 5 and the refrigerating compartment 7 is set by the user, and power is supplied to the refrigerator, a control means (not shown) senses the freezer compartment temperature sensor 54. When the temperature of the freezer compartment 5 is higher than the temperature of the freezer compartment 5 set by the user, the compressor 40 is driven.

Next, as the compressor 40 is driven, the refrigerant compressed with a gas having a high temperature and high pressure passes through the auxiliary condenser 43, and evaporates the defrost water collected in the evaporation plate 21, and the auxiliary condenser 43 is The refrigerant passing through is introduced into the main condenser 41 and is heat-exchanged by natural convection or forced convection with external air, and is cooled and liquefied by a low temperature low pressure refrigerant.

Subsequently, the low temperature low pressure liquid refrigerant liquefied in the main condenser 41 is decompressed to a low temperature low pressure free refrigerant which is easy to evaporate while passing through a capillary tube which expands to the evaporation pressure, thereby freezing chamber evaporator 10 and the refrigerator compartment evaporator 27. Flows into.

Next, the low-temperature low-pressure free refrigerant decompressed in the freezer compartment evaporator 10 and the refrigerator compartment evaporator 27 is evaporated while passing through a plurality of pipes to cool the air in the freezer compartment 5 and the refrigerating compartment 7 to cold air (chill). The low-temperature low-pressure gas refrigerant cooled in the freezer compartment evaporator 10 and the refrigerator compartment evaporator 27 repeats the freezing cycle which is sucked into the compressor 40 again.

On the other hand, the control means drives the compressor 40 and at the same time counts the drive time of the compressor 40, the temperature of the refrigerating chamber (7) detected by the refrigerating chamber temperature sensor 55 is set by the user If the temperature is greater than or equal to (7), the refrigerating chamber fan motor 29 is driven.

Next, as the refrigerating chamber fan motor 29 is driven, the refrigerating chamber fan 30 rotates to repeat the freezing cycle as described above, and the cold air heat-exchanged by the refrigerating chamber evaporator 27 opens the second duct member 31. Guided along and discharged into the refrigerating chamber 7 through the second cold air discharge port 33, the inside of the refrigerating chamber 7 is cooled by the cold air discharged through the second cold air discharge port 33.

On the other hand, the control means drives the freezer compartment motor 11 when the temperature of the refrigerating compartment 7 is lower than the temperature of the refrigerating compartment 7 set by the user, and the freezer compartment fan 13 as the freezer compartment motor 11 is driven. ) Is rotated and the cold cycle heat exchanged by the freezer compartment evaporator 10 is guided along the first duct member 15 while being discharged into the freezer compartment 5 through the first cold air outlet 17. The inside of the freezing chamber 5 is cooled by the cold air discharged through the second cold air discharge port 33.

Next, the control means stops the compressor 40, the freezer compartment fan motor 11 and the refrigerating compartment fan motor 29 when the counted driving time of the compressor 40 reaches a predetermined time. 35).

Then, as the compressor 40, the freezer compartment fan motor 11, and the refrigerating compartment fan motor 29 are stopped, the cooling operation of the refrigerator is stopped, and the refrigerating compartment heater 35 is driven as the refrigerator compartment heater 35 is driven. The frost formed on the refrigerating chamber evaporator 27 begins to be defrosted by the exothermic heat of c).

Next, when the temperature of the refrigerator compartment evaporator 27 sensed by the refrigerator compartment evaporator temperature sensor 58 is equal to or greater than a predetermined temperature, the control means stops the refrigerator compartment heater 35 of the compressor 40 of the counted compressor 40. Reset the drive time.

Next, the control means drives the compressor 40 when the temperature of the freezer compartment 5 detected by the freezer compartment temperature sensor 54 is higher than the temperature of the freezer compartment 5 set by the user, and at the same time the compressor 40 ), And when the counted drive time of the compressor 40 reaches a predetermined time, the compressor 40, the freezer compartment fan motor 11 and the refrigerating compartment fan motor 29 are stopped, and the freezer compartment heater ( 19) and the refrigerator compartment heater 35 are driven.

Next, as the compressor 40, the freezer compartment fan motor 11, and the refrigerating compartment fan motor 29 are stopped, the cooling operation of the refrigerator is stopped, and as the freezer compartment heater 19 and the refrigerating compartment heater 35 are driven. Defrosting on the freezer compartment evaporator 10 and the refrigerator compartment evaporator 27 begins to be defrosted by the heat generation of the freezer compartment heater 19 and the refrigerating compartment heater 35.

Then, the control means is a freezer compartment heater when the temperature of the freezer compartment evaporator 10 and the refrigerator compartment evaporator 27 detected by the freezer compartment evaporator temperature sensor 57 and the refrigerator compartment evaporator temperature sensor 58 is equal to or greater than a predetermined temperature. When the refrigerator compartment evaporator 27 is defrosted twice by stopping the 19 and the refrigerator compartment heater 35, the defrosting operation of the refrigerator in which the freezer compartment evaporator 10 is defrosted once is finished.

On the other hand, when the user opens the door of the refrigerator, external air flows into the refrigerator and frost is formed in the evaporator due to moisture contained in the external air, so that the user opens the freezer door 8 or the refrigerating chamber door 9. As a result, the amount of frost implanted in the freezer compartment evaporator 10 and the refrigerator compartment evaporator 27 is not constant.

Accordingly, if the amount of frost formed on the evaporator increases before the counting time of the compressor is set to a predetermined time, the heat exchange of the evaporator is lowered, thereby increasing the temperature in the refrigerator and cooling efficiency of the refrigerator. There was a problem falling.

Accordingly, the present invention has been made to solve the above problems, by checking the temperature difference of the evaporator before and after the fan is driven to detect the amount of frost formed on the evaporator, accordingly defrost the evaporator It is an object of the present invention to provide a defrosting operation method of a refrigerator that can not only prevent the internal temperature from rising, but also improve the cooling efficiency of the refrigerator.

In order to achieve the above object, a defrosting operation method of a refrigerator according to the present invention includes a compressor driving step of driving a compressor according to a set temperature, a predetermined time after the compressor is driven, and then driving a fan, before and after the fan driving. A temperature difference comparison step for checking the temperature of the evaporator and comparing the temperature difference with a predetermined temperature, and stopping the driving of the compressor and the fan when the temperature difference before and after the fan driving is greater than the predetermined temperature in the temperature difference comparison step. And a defrosting step of defrosting the evaporator by driving a heater and a stopping step of stopping the driving of the heater when the temperature of the evaporator is greater than or equal to a predetermined temperature in the defrosting step.

1 is a side cross-sectional view of a typical refrigerator,

2 is a defrost operation control block diagram of a refrigerator according to the present invention;

3 is a view illustrating a timing of driving a compressor and a fan and a temperature change of the evaporator according to an embodiment of the present invention;

4A to 4C are flowcharts illustrating a defrosting operation method of a refrigerator according to the present invention.

Explanation of symbols for main parts of the drawings

54: freezer temperature sensor 55: cold room temperature sensor

57: freezer evaporator temperature sensor 58: cold room evaporator temperature sensor

60: control means 70: compressor driving means

72: freezer compartment fan motor drive unit 73: refrigerator compartment fan motor drive unit

75: freezer heater driving unit 76: refrigerator compartment heater driving unit

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the defrosting operation method of the refrigerator according to the present invention.

Figure 2 is a defrosting operation control block diagram of a refrigerator according to the present invention, as can be seen with reference to the drawings, a refrigerator for performing the defrosting operation method of the refrigerator according to the present invention is a temperature control means 50, the temperature sensing Means 53, evaporator temperature sensing means 56, control means 60, compressor driving means 70, fan motor driving means 71, and heater driving means 74.

In Figure 2, the temperature control means 50 is for the user to set the temperature in the freezer compartment and the refrigerator compartment, the freezer compartment temperature control unit 51 for adjusting the temperature in the freezer compartment and the refrigerating compartment for adjusting the temperature in the refrigerator compartment It consists of a temperature control unit (52).

In addition, the temperature detecting means 53 detects temperatures in the freezing compartment and the refrigerating compartment and outputs a corresponding detection signal to the control means 60. The temperature detecting means 53 detects the temperature of the freezing compartment and the freezing compartment temperature sensor 54 and the refrigerating compartment. It consists of a refrigerator compartment temperature sensor 55 for sensing the temperature.

In addition, the evaporator temperature detecting means 56 detects the temperature of the evaporator and outputs a corresponding detection signal to the control means 60. The freezing chamber evaporator temperature sensor 57 and the refrigerator compartment evaporator detecting the temperature of the freezing chamber evaporator ( It consists of a refrigerator compartment evaporator temperature sensor 58 for detecting the temperature of 27.

Then, the control means 60 receives the detection signal from the temperature sensing means 53, if the temperature of the freezer compartment and the refrigerating compartment is higher than the temperature of the freezer compartment and the refrigerating compartment set by the user through the temperature control means 50, to drive the compressor The drive control signal is output to the compressor drive means 70, and when a predetermined time has elapsed after the compressor is driven, the drive control signal for driving the fan motor is output to the fan motor drive means 71.

In addition, the control means 60 receives the detection signal from the evaporator temperature sensing means 56, the stop control for stopping the compressor and the fan motor when the temperature difference between the evaporator before and after the fan motor is driven is a predetermined temperature or more. The signal is outputted to the compressor driving means 70 and the fan motor driving means 71, and at the same time, a drive control signal for driving the heater is output to the heater driving means 74, while the temperature of the evaporator is preset at a predetermined temperature. If abnormal, the stop control signal for stopping the heater is output to the heater driving means 74.

The compressor driving means 70 drives the compressor by the drive control signal of the control means 60, and the fan motor driving means 71 drives the fan motor by the drive control signal of the control means 60. The refrigerator compartment comprises a freezer compartment fan motor driving unit 72 for driving a freezer compartment fan motor and a refrigerating compartment fan motor driving unit 73 for driving a refrigerating compartment fan motor.

In addition, the heater driving means 74 drives the heater by the drive control signal of the control means 60, and the refrigerating chamber heater driving unit 82 for driving the freezer compartment heater and the refrigerating chamber heater driving unit 76 for driving the refrigerating chamber heater. consist of.

On the other hand, Figure 3 is a diagram showing the timing of driving the compressor and the fan according to an embodiment of the present invention and the temperature change of the evaporator accordingly, as can be seen with reference to the same figure, the temperature of the evaporator as the compressor is driven Begins to descend.

When the fan is driven after the predetermined time T1 has elapsed, the temperature of the evaporator having a small amount of frost formed is increased and lowered again for a predetermined time T2 under the influence of the temperature in the refrigerator higher than the temperature of the evaporator. However, the temperature of the evaporator having a large amount of frosted frost is kept low for a predetermined time (T2) by being influenced by the temperature in the high refrigerator by the frosted frost.

That is, the amount of frost implanted in the evaporator is sensed by using the difference in the temperature of the evaporator before and after the fan is driven according to the amount of frost implanted in the evaporator, and thus defrosting the frost implanted in the evaporator.

The defrosting operation method of the refrigerator according to the present invention for defrosting the refrigerator configured as described above will be described in detail with reference to FIGS. 1 to 4C.

First, when the user sets the temperature of the freezer compartment 5 and the freezer compartment 7 through the freezer compartment temperature controller 51 and the refrigerator compartment temperature controller 52 (S10), the freezer compartment temperature sensor 54 is the freezer compartment 5 Sensing the temperature and outputs a corresponding detection signal to the control means (60).

Next, the control means 60 receives the detection signal to determine whether the temperature in the freezer compartment 5 is higher than the temperature of the freezer compartment 5 set by the user, so that the temperature of the freezer compartment 5 is not higher than or equal to the set temperature. If it is determined that the temperature of the freezer compartment 5 is equal to or greater than the set temperature, the control unit repeatedly outputs a drive control signal for driving the compressor 40 to the compressor driving means 70. (S12).

Then, the compressor driving means 70 drives the compressor 40 according to the drive control signal, and as the compressor 40 is driven, air in the refrigerator is stored in the freezer compartment evaporator 10 and the refrigerator compartment evaporator 27. Heat exchange to cold in (S14).

Next, the control means 60 counts the driving time of the compressor 40 (S16), while receiving a detection signal from the refrigerating compartment temperature sensor 55, the temperature in the refrigerating compartment 7 is set by the user ( It is determined whether or not the temperature of 7) is higher (S18).

Next, when it is determined in the step S18 that the temperature of the refrigerating chamber 7 is equal to or higher than the set temperature, the control means 60 determines that the drive time of the compressor 40 that has been counted is predetermined time T1. It is determined whether the elapsed time (S20).

Next, if it is determined that the predetermined time T1 has not elapsed as a result of the determination in step S20, the control means 60 determines whether the drive time of the compressor 40 has elapsed the predetermined time T1. On the other hand, if it is determined that the predetermined time T1 has elapsed, the temperature C1 of the refrigerator compartment evaporator 27 is checked through the refrigerator compartment evaporator temperature sensor 58 (S22).

Then, the control means 60 outputs a drive control signal for driving the refrigerator compartment fan motor 29 to the refrigerator compartment fan motor driver 73, and the refrigerator compartment fan motor driver 73 is driven by the drive control signal. The refrigerator compartment fan motor 29 is driven, and the refrigerator compartment fan 30 rotates as the refrigerator compartment fan motor 29 is driven (S24).

Next, the control means 60 judges whether the counted driving time of the compressor 40 has passed the predetermined time T2 (S26), and if it is determined that the arm has not passed the predetermined time T2, the compressor 40 Is repeatedly performed, and if it is determined that the predetermined time T2 has elapsed, the temperature of the refrigerator compartment evaporator 27 through the refrigerator evaporator temperature sensor 58 is determined. C2) is checked (S28).

Then, the control means 60 controls the temperature C1 of the refrigerator compartment evaporator 27 checked before the refrigerator compartment fan 30 is driven and the refrigerator compartment evaporator 27 checked after the refrigerator compartment fan 30 is driven. The temperature difference C1-C2 of the temperature C2 is calculated, and it is determined whether the calculated temperature difference C1-C2 of the refrigerator compartment evaporator 27 is equal to or greater than a predetermined temperature (S30).

Next, when it is determined in the step S30 that the temperature is not higher than a predetermined temperature, the control means 60 receives a detection signal from the refrigerating chamber temperature sensor 55 to determine whether the temperature of the refrigerating chamber 7 is lower than or equal to the set temperature. Determine (S32).

Subsequently, if it is determined that the temperature is not lower than or equal to the set temperature, the control means 60 continuously drives the refrigerator compartment fan 30 to determine whether the temperature of the refrigerator compartment 7 is lower than or equal to the preset temperature. While repeating the determination and determining that the temperature is equal to or lower than the set temperature, a stop control signal for stopping the compressor 40 and the refrigerator compartment fan motor 29 is output to the compressor driving means 70 and the refrigerator compartment fan motor driver 73. .

Next, the compressor driving means 70 stops the compressor 40 in response to the stop control signal, and the refrigerating compartment fan motor driving unit 73 stops the refrigerating compartment fan motor 29 in response to the stop control signal. As the refrigerating compartment fan motor 29 is stopped, the refrigerating compartment fan 30 is stopped to stop the cooling operation of the refrigerating compartment 7 (S34).

On the other hand, when the determination result of the step (S30), it is determined that the predetermined temperature or more, the control means 60 and the compressor drive means 70 and the stop control signal for stopping the compressor 40 and the refrigerator compartment fan motor 29 Output to refrigerating fan motor drive unit (73).

Next, the compressor driving means 70 stops the compressor 40 by the stop control signal, and the refrigerating compartment fan motor driver 73 stops the refrigerating compartment fan motor 29 by the stop control signal. As the refrigerating compartment fan motor 29 is stopped, the refrigerating compartment fan 30 is stopped (S36).

Then, the control means 60 outputs a drive control signal for driving the refrigerating chamber heater 35 to the refrigerating chamber heater driving unit 76, and the refrigerating chamber heater driving unit 76 generates a refrigerating chamber heater ( 35 is driven, and as the refrigerating chamber heater 35 is driven, frost formed on the refrigerating chamber evaporator 27 starts to be removed (S37).

Next, the control means 60 determines whether the temperature of the refrigerator compartment evaporator 27 is greater than or equal to a predetermined temperature by the refrigerator compartment evaporator temperature sensor 58, and determines that the temperature of the refrigerator compartment evaporator 27 is not greater than or equal to the predetermined temperature. While repeatedly determining whether the temperature is equal to or higher than the predetermined temperature, when it is determined that the temperature is higher than or equal to the predetermined temperature, a stop control signal for stopping the refrigerating chamber heater 35 is output to the refrigerating chamber heater driver 76 (S38).

Then, the refrigerating chamber heater driving unit 76 stops the refrigerating chamber heater 35 by the stop control signal, and the defrosting operation of the refrigerating chamber 7 is stopped as the refrigerating chamber heater 35 is stopped (S39). .

On the other hand, if it is determined that the temperature of the refrigerating chamber 7 is not higher than or equal to the set temperature as a result of the determination in step S18, the control means 60 determines the predetermined time T1 at which the driving time of the compressor 40 counted is preset It is determined whether the elapsed time (S40).

Next, if it is determined that the predetermined time T1 has not elapsed as a result of the determination in step S40, the control means 60 determines whether the driving time of the compressor 40 has elapsed the predetermined time T1. While repeatedly performing the predetermined time T1, it is determined that the temperature C1 ′ of the freezer compartment evaporator 10 is checked through the freezer compartment evaporator temperature sensor 57 (S42).

Then, the control means 60 outputs a drive control signal for driving the freezer compartment fan motor 11 to the freezer compartment fan motor driver 72, and the freezer compartment fan motor driver 72 is driven by the drive control signal. The freezer compartment fan motor 11 is driven and the freezer compartment fan 13 is rotated as the freezer compartment fan motor 11 is driven (S44).

Next, the control means 60 judges whether the counted driving time of the compressor 40 has passed the predetermined time T2 (S46), and if it is determined that the predetermined time T2 has not elapsed, the compressor 40 Is repeatedly performed, and if it is determined that the predetermined time T2 has elapsed, the temperature of the refrigerator compartment evaporator 27 through the freezer evaporator temperature sensor 57 is determined. C2 ') is checked (S48).

Then, the control means 60 checks the temperature C1 'of the freezer compartment evaporator 10 checked before the freezer compartment 13 is driven and the freezer compartment evaporator 10 checked after the freezer compartment 13 is driven. The temperature difference C1'-C2 'of the temperature C2') is calculated, and it is determined whether the calculated temperature C1'-C2 'of the freezer compartment evaporator 10 is equal to or greater than a predetermined temperature (S50). .

Next, when it is determined in the step S50 that the temperature is not equal to or greater than a predetermined temperature, the control means 60 receives a detection signal from the freezer compartment temperature sensor 54 to determine whether the temperature of the freezer compartment 5 is lower than or equal to the set temperature. Determine (S52).

Subsequently, when it is determined that the temperature is not lower than or equal to the set temperature, the control means 60 continuously drives the freezer compartment fan 13 to determine whether the temperature of the freezer compartment 5 is lower than or equal to the set temperature. While repeating the determination and determining that the temperature is equal to or lower than the set temperature, a stop control signal for stopping the compressor 40 and the freezing chamber fan motor 11 is output to the compressor driving means 70 and the freezing chamber fan motor driving unit 72. .

Next, the compressor driving means 70 stops the compressor 40 by the stop control signal, and the freezer compartment motor driving unit 72 stops the freezer compartment fan motor 11 by the stop control signal. As the freezing compartment fan motor 11 is stopped, the freezing compartment fan 13 is stopped to stop the cooling operation of the freezing compartment 5 (s54).

On the other hand, when the determination result of the step (S50), it is determined that the predetermined temperature or more, the control means 60 and the compressor drive means 70 and the stop control signal for stopping the compressor 40 and the freezer compartment fan motor 11 Output to the freezer fan motor drive unit (72).

Next, the compressor driving means 70 stops the compressor 40 by the stop control signal, and the freezer compartment fan motor driving unit 72 stops the freezer compartment fan motor 11 by the stop control signal. As the freezing compartment fan motor 11 is stopped, the freezing compartment fan 13 is stopped (s56).

Then, the control means 60 outputs a drive control signal for driving the freezer compartment heater 19 to the freezer compartment heater driving unit 75, and the freezer compartment heater driving unit 75 generates a freezer compartment heater (in response to the drive control signal). 19), and as the freezer compartment heater 19 is driven, frost formed on the freezer compartment evaporator 10 starts to be removed (s57).

Next, the control means 60 determines whether the temperature of the freezer compartment evaporator 10 is greater than or equal to a predetermined temperature by the freezer compartment evaporator temperature sensor 57 and determines that the temperature of the freezer compartment evaporator 10 is not greater than or equal to the predetermined temperature. While repeatedly determining whether the temperature is equal to or higher than the predetermined temperature, when it is determined that the temperature is higher than or equal to the predetermined temperature, a stop control signal for stopping the freezer compartment heater 19 is output to the refrigerating chamber heater driver 82 (S58).

Then, the refrigerator compartment heater driving unit 82 stops the freezer compartment heater 19 by the stop control signal, and the defrosting operation of the freezer compartment 5 is stopped as the freezer compartment heater 19 is stopped (s59). .

On the other hand, the defrosting operation method of the refrigerator according to the present invention as described as an example of defrosting the freezer compartment evaporator and the refrigerator compartment evaporator by detecting the amount of frost formed on the freezer compartment evaporator and the refrigerator compartment evaporator, but is not limited thereto. When defrosting the freezer evaporator, it is natural to defrost the refrigerator compartment evaporator at the same time or to defrost the freezer compartment evaporator at the same time.

As described above, the defrosting operation method of the refrigerator according to the present invention checks the temperature difference between the evaporator before and after the fan is driven to sense the amount of frost formed on the evaporator, and accordingly defrosts the evaporator, thereby defrosting the evaporator. Not only can the temperature in the refrigerator increase due to the large amount of frost, but also it can be prevented, and the cooling efficiency of the refrigerator can be improved.

Claims (5)

A compressor driving step of driving the compressor according to the set temperature; A temperature difference comparing step of driving a fan after a predetermined time has passed since the compressor is driven, and checking the temperature of the evaporator before and after the fan driving and comparing the temperature difference with a predetermined temperature; A defrost step of stopping the driving of the compressor and the fan and driving the heater to defrost the evaporator if the temperature difference before and after the fan driving is equal to or greater than the predetermined temperature in the temperature difference comparing step; And a heater stop step of stopping driving of the heater when the temperature of the evaporator is greater than or equal to a predetermined temperature in the defrost step. The method of claim 1, further comprising a cooling step of cooling the inside of the refrigerator by driving the fan when the temperature difference before and after the fan driving in the temperature difference comparison step is not more than the predetermined temperature. . According to claim 1 or claim 2, wherein the temperature difference comparison step, after a predetermined time after the drive of the compressor drives the refrigerator compartment fan, and checks the temperature of the refrigerator compartment evaporator before and after the refrigerating compartment fan drive and the predetermined temperature difference A refrigerating chamber evaporator temperature difference comparison step compared with a predetermined temperature; After a predetermined time has elapsed after the compressor is driven, the freezer fan is driven, and the refrigerator comprises a freezer evaporator temperature difference comparison step of checking the temperature of the freezer compartment evaporator before and after the freezer compartment driving and comparing the temperature difference with a predetermined temperature. Defrosting operation method. The refrigerator according to claim 1 or 2, wherein the defrosting step stops the operation of the compressor and the refrigerating chamber fan when the temperature difference before and after the refrigerating fan operation in the refrigerating chamber evaporator temperature difference comparison step of the temperature difference comparison step is equal to or greater than a predetermined temperature. A refrigerator compartment defrost depth for driving to defrost the refrigerator compartment evaporator; Freezer Chamber Evaporator of Temperature Difference Comparison Step When the temperature difference before and after the operation of the freezer compartment fan is greater than the predetermined temperature in the temperature difference comparison step, the compressor and the freezer compartment fan are stopped and the freezer chamber defroster is driven to defrost the freezer compartment evaporator. How to defrost refrigerator. The refrigerator stop according to claim 1 or 2, wherein the heater stop step comprises: a refrigerator compartment heater stop depth for stopping the operation of the refrigerator compartment heater when the temperature of the refrigerator compartment evaporator is greater than or equal to a predetermined temperature in the refrigerator compartment defrost depth of the defrost step; A defrosting operation method of a refrigerator comprising a freezing chamber heater stop step of stopping driving of the freezer compartment heater when the temperature of the freezer compartment evaporator in the freezing chamber defrost step of the defrost step is greater than or equal to a predetermined temperature.

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