KR20190018880A - Refrigerator and Control method of the same - Google Patents

Abstract

According to an embodiment, a refrigerator comprises: an evaporator; a defrosting sensor sensing temperature around the evaporator; a defrosting heater configured to defrost the evaporator; and a control unit turning the defrosting heater off based on the temperature sensed from the defrosting sensor after the defrosting heater is turned on. The control unit turns the defrosting heater off when the temperature sensed from the defrosting sensor is higher than or equal to a reference defrosting finishing temperature within a predetermined period of time after the defrosting heater is turned on. Moreover, after the predetermined period of time, the defrosting heater is turned off when the temperature sensed from the defrosting sensor is higher than or equal to a variable defrosting finishing temperature higher than the defrosting finishing temperature. Therefore, reliability in defrosting operation can be secured under the condition that a large amount of frost is on the evaporator.

Description

[0001] The present invention relates to a refrigerator and a control method thereof,

The present invention relates to a refrigerator and a method of operating the same, and more particularly, to a refrigerator having a defrost heater for defrosting an evaporator and a method of operating the same.

BACKGROUND ART A refrigerator is a device for preventing an object to be cooled (hereinafter referred to as " food ") such as foods, medicines and cosmetics from being cooled or stored at a low temperature to prevent decay and alteration.

The refrigerator includes a storage room for storing food and a cooling device for cooling the storage room.

The cooling device may include a compressor through which the refrigerant is circulated, a condenser, an expansion mechanism, and an evaporator.

The refrigerator may further include a blowing fan for circulating the air in the storage compartment to the evaporator and the storage compartment. The blower fan may be disposed in the periphery of the evaporator and may form a flow of air to the storage room after the air in the storage compartment flows to the evaporator.

The refrigerator can be frosted on the evaporator when used for a long time, and the refrigerator can perform the defrosting operation to remove the frost of the evaporator.

The refrigerator may include a defrost heater for defrosting the evaporator. A defrost heater may be installed around the evaporator or evaporator. In the defrosting operation, the compressor can be stopped, and the defrost heater can be turned on to heat the evaporator.

When the temperature of the evaporator is sufficiently raised, the refrigerator can determine that the defrosting has been completed and terminate the defrosting operation.

A defrosting sensor for detecting the temperature can be installed around the evaporator or the evaporator, and the temperature sensed by the defrosting sensor can be used to determine the ending point of the defrosting operation.

As described above, as an example of a conventional technique for defrosting an evaporator, Korean Patent Laid-Open Publication No. 10-2001-0026176 (published on Apr. 06, 2001) discloses a defrost heater control method for a refrigerator, Off the defrost heater when the temperature detected by the defrost sensor reaches the defrost heater off temperature while the evaporator is defrosted by the defrost heater.

However, in the conventional method of controlling the defrost heater of the refrigerator, if the temperature detected by the defrost sensor is equal to or higher than the defrost heater off temperature, the defrosting operation may be prematurely terminated even if the entire evaporator is not fully defrosted The defrosting operation can be terminated in a state in which the entire evaporator is not completely defrosted, particularly when the evaporation amount of the evaporator is large.

Korean Patent Publication No. 10-2001-0026176 (published on April 06, 2001)

An object of the present invention is to provide a refrigerator having high reliability of defrosting operation and a method of operating the same.

A refrigerator according to an embodiment of the present invention includes an evaporator; A defrost sensor for detecting a temperature around the evaporator or the evaporator; And a control unit for turning off the defrost heater according to the temperature sensed by the defrost sensor after the defrost heater is turned on. The controller detects the temperature sensed by the defrost sensor within the set time after the defrost heater is turned on If the temperature exceeds the reference defrost termination temperature, the defrost heater is turned off. If the temperature detected by the defrost sensor is higher than the reference defrost termination temperature after the set time, the defrost heater is turned off.

According to another aspect of the present invention, there is provided a refrigerator comprising: an evaporator; A defrost sensor for detecting a temperature around the evaporator or the evaporator; And a control unit for turning off the defrost heater according to the temperature sensed by the defrost sensor after the defrost heater is turned on, wherein the control unit controls the defrosting unit such that the desired temperature level of the storage room, in which the evaporator is cooled, The defrost heater is turned on for the minimum defrost setting time if the detected temperature is higher than the reference defrost termination temperature within the set time after the defrost heater is turned on and the defrost heater is turned off when the minimum defrost set time has elapsed.

The evaporator can be connected to the heat transfer fins in the refrigerant tube having the tube inlet portion and the tube outlet portion, and the tube inlet portion can be located at one side of the evaporator. The defrost sensor can be installed on the opposite side of the tube inlet of the evaporator. The defrost heater may be installed so that the heat generating portion is closer to the tube inlet portion of the defrosting sensor than the tube inlet portion of the defrosting sensor, and the non-heating portion is closer to the defrosting sensor than the tube inlet portion and the defrosting sensor.

A method of operating a refrigerator according to an embodiment of the present invention includes an evaporator; A defrost sensor for detecting the temperature of the evaporator or the temperature around the evaporator; And a defrost heater for defrosting the evaporator, the method comprising: turning on the defrost heater when the defrost operation start condition is satisfied; And turning off the defrost heater after the defrost heater is turned on, wherein turning off the defrost heater turns off the defrost heater if the temperature detected by the defrost sensor is equal to or higher than the reference defrost termination temperature within the set time after the defrost heater is turned on After the set time, if the temperature detected by the defrost sensor is equal to or higher than the variable defrost end temperature which is higher than the reference defrost termination temperature, the defrost heater is turned off.

A method of operating a refrigerator according to another embodiment of the present invention includes an evaporator; A defrost sensor for detecting a temperature around the evaporator or the evaporator; A method of operating a refrigerator that controls a refrigerator including a defrost heater for defrosting an evaporator, the method comprising: turning on a defrost heater in a defrost operation start condition; Turning on the defrost heater during the minimum defrost set time if the desired temperature level of the storage chamber in which the evaporator is cooled is equal to or higher than the set level and the temperature sensed by the defrost sensor is within the set time after the defrost heater is turned on; And turning off the defrost heater when the minimum defrost setting time has elapsed.

The minimum defrost setting time may be set differently according to the desired temperature level.

The minimum defrost setting time when the level of the desired temperature is high may be shorter than the minimum defrost setting time when the desired temperature is low.

If the temperature sensed by the defrost sensor after the set time exceeds the reference defrost termination temperature, the defrost heater may be turned off.

If the temperature sensed by the defrost sensor is equal to or higher than the reference defrost termination temperature within the set time and the desired temperature level of the storage room where the evaporator is cooled is below the set level, the defrost heater can be turned off.

According to the embodiment of the present invention, when the evaporator is over-con- ditioning condition, the defrosting operation can be terminated after the evaporator is fully defrosted, and the reliability of the defrosting operation can be enhanced.

According to the embodiment of the present invention, when the desired temperature of the storage compartment is set to be high and the amount of impregnation of the evaporator is not large, the evaporator is defrosted after the defrosting for the minimum set time, so that the evaporator can be minimized.

In addition, the evaporator inlet tube portion can be efficiently defrosted, the defrosting sensor can be easily mounted, the evaporator inlet tube portion having a large amount of heat generated by the defrost heater can be efficiently defrosted, the heat transmitted to the defrost sensor from the defrost heater can be minimized, .

In addition, the optimum minimum defrost setting time is set for each desired temperature in the storage room, and the evaporator can be optimally defrosted.

In addition, when the evaporator is defrosted for more than the set time, there is an advantage that the defrosting of the evaporator can be completed without further addition of the evaporator to the defrost heater, thereby preventing an increase in power consumption due to the additional defrosting of the evaporator.

Further, when the desired temperature level of the storage compartment is lower than the set level, there is an advantage that the evaporator is not additionally damaged by the defrost heater, and the power consumption due to the additional defrosting of the evaporator can be prevented.

FIG. 1 is a view illustrating a refrigeration cycle apparatus constituting a refrigerator according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view illustrating the inside of a refrigerator according to an embodiment of the present invention,
FIG. 3 is a front view showing the refrigerator compartment evaporator and the refrigerator compartment defroster heater shown in FIG. 2,
FIG. 4 is a plan view showing the refrigerator compartment evaporator and the refrigerator compartment defroster heater shown in FIG. 2. FIG.
5 is a side view of the defrost chamber evaporator and the defrosting chamber defrost heater shown in Fig.
FIG. 6 is a front view of the freezer compartment evaporator and the freezer compartment defrost heater shown in FIG. 2,
FIG. 7 is a plan view showing the freezer compartment evaporator and the freezer compartment defrost heater shown in FIG. 2. FIG.
FIG. 8 is a side view of the freezer compartment evaporator and the defrosting chamber defrost heater shown in FIG. 2. FIG.
9 is a control block diagram of a refrigerator according to an embodiment of the present invention.
10 is a flowchart illustrating a method of operating a refrigerator according to an embodiment of the present invention.
11 is a flowchart illustrating an operation method of a refrigerator according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a view showing a refrigeration cycle apparatus constituting a refrigerator according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view illustrating the inside of a refrigerator according to an embodiment of the present invention.

The refrigerator may include a compressor 1 in which a refrigerant is circulated, a condenser 2, an expansion mechanism 3, and an evaporator 4. The refrigerator may further include a defrost sensor (6) and a defrost heater (8) installed in the evaporator (4).

The refrigerator may include a main body 9 in which a refrigerating compartment R and a freezing compartment F are partitioned. The main body 9 may include a barrier 91 for partitioning the refrigerating compartment R and the freezing compartment F. [

The machine room M can be partitioned from the refrigerating chamber R and the freezing chamber F and the compressor 1 and the condenser 2 can be accommodated in the machine room M. [

The refrigerator may include a door 92 for opening and closing the refrigerating compartment R and a door 93 for opening and closing the freezing compartment F. [

The compressor (1) can be connected to the condenser (2) and the compressor outlet tube (11). The compressor 1 may be connected to the evaporator 4 and the evaporator outlet tube 46.

The refrigerator may further include a condensing fan (21) for blowing outside air to the condenser (2). The condenser (2) may be connected to a condenser outlet tube (22).

At least two evaporators 4 may be provided in the refrigerator.

When the refrigerator includes at least two evaporators 4A and 4B, the refrigerator may include a refrigerating compartment evaporator 4A for cooling the refrigerating compartment R and a freezing compartment evaporator 4B for cooling the freezing compartment F .

When the refrigerator includes the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B, the expansion mechanism 3 includes a refrigerating compartment expansion mechanism 3A for decompressing the refrigerant flowing toward the refrigerating compartment evaporator 4A, And a freezing compartment expansion mechanism (3B) for reducing the pressure of the refrigerant flowing toward the freezing compartment.

When the refrigerator includes the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B, the evaporator inlet tube 45 may be connected to each of the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B.

The evaporator inlet tube 45 connected to the refrigerating compartment evaporator 4A may be connected to the refrigerating compartment expansion mechanism 3A and the evaporator inlet tube 45 connected to the freezing compartment evaporator 4B may be connected to the freezing compartment expansion mechanism 3B.

When the refrigerator includes both the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B, the refrigerator performs a flow switching operation for guiding the refrigerant passed through the condenser 2 to the freezing compartment expansion mechanism 3A or the freezing compartment expansion mechanism 3B And may further include a valve 5.

A condenser outlet tube 22 may be connected to the flow switching valve 5. The flow path switching valve 5 can be connected to the refrigerating compartment expansion mechanism 3A and the refrigerating compartment expansion device inlet tube 31. [ The flow path switching valve 5 may be connected to the freezing compartment expansion mechanism 3B and the freezing compartment expansion mechanism inlet tube 32. [

When the refrigerator includes both the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B, the refrigerator includes a refrigerating compartment fan 71 for circulating the cold air of the refrigerating compartment R to the refrigerating compartment evaporator 4A and the refrigerating compartment R, F to the freezer compartment evaporator 4B and the freezer compartment F. The freezer compartment fan 4 may be a refrigerator compartment,

When the refrigerator includes the refrigerating compartment evaporator 4A, the refrigerating compartment evaporator 4A may be provided with the refrigerating compartment defrost sensor 6A and the refrigerating compartment defrosting heater 8A.

When the refrigerator includes the freezer compartment evaporator 4B, the freezer compartment defrost sensor 6B and the freezer compartment defroster heater 8B may be installed.

The common constitution of the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B will be described as an evaporator 4 except that the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B have the same configuration except for the refrigerating compartment evaporator 4A and the freezing compartment evaporator 4B, And is referred to as an evaporator 4B.

The common components of the refrigerating compartment defrosting sensor 6A and the freezing compartment defrosting sensor 6B will be described as a defrosting sensor 6. Other than the common components of the refrigerating compartment defrosting sensor 6A and the freezing compartment defrosting sensor 6B, The sensor 6A and the freezer compartment defrost sensor 6B will be described.

The refrigerator compartment defroster heater 8A and the freezer compartment defroster heater 8B have the same structure as that of the defrost heater 8 except that the refrigerator compartment defroster 8A and the freezer compartment defroster heater 8B have the same structure. Will be referred to as a heater 8A and a freezer compartment defroster heater 8B.

The evaporator 4 may include a refrigerant tube 43 having a tube inlet portion 41 and a tube outlet portion 42. The evaporator 4 may further include a heat transfer fin 44 coupled to the refrigerant tube 43.

The tube inlet (41) can be located at one side of the evaporator (4). The tube inlet portion 41 may be positioned eccentrically on one side of the left and right sides of the evaporator 4 or eccentrically on one side of the upper and lower sides of the evaporator 4.

The defrost sensor 6 can sense the temperature around the evaporator 4 or the evaporator 4. [ The defrost sensor 6 may be installed in the evaporator 4 and may be installed on the opposite side of the tube inlet 41 of the evaporator 4 in particular.

The tube inlet part 41 may be connected to an evaporator inlet tube 45 for guiding the refrigerant expanded in the expansion mechanism 3 to the tube inlet part 41.

An evaporator outlet tube 46 for guiding the refrigerant that has passed through the refrigerant tube 43 to the compressor 1 is connected to the tube outlet portion 42 or an accumulator 47 coupled to the evaporator outlet tube 46 is connected to the tube outlet portion 42 .

The defrost sensor 6 may be installed on the other side of the left and right sides of the evaporator 4 when the tube inlet portion 41 is positioned eccentrically to one side of the left and right sides of the evaporator 4. [ The defrosting sensor 6 can be installed on the right side of the evaporator 4 and the tube inlet 41 can be disposed on the right side of the evaporator 4 when the tube inlet part 41 is located on the left side of the evaporator 4. [ The defrost sensor 6 may be installed on the left side of the evaporator 4. The defrost sensor 6 may be disposed on the left side of the evaporator 4. [

When the tube inlet part 41 is positioned eccentrically on one side of the upper and lower sides of the evaporator 4, the defrost sensor can be installed on the other side of the upper and lower sides of the evaporator 4. The defrosting sensor 6 can be positioned below the evaporator 4 and the tube inlet 41 can be positioned below the evaporator 4 when the tube inlet 41 is located above the evaporator 4, The defrost sensor 6 can be installed on the upper side of the evaporator.

The defrost heater (8) can defrost the frost of the evaporator (4) by heating the evaporator (4). The defrost heater (8) can be installed in the evaporator (4).

The defrost heater 8 may be a sheath heater such as a tubular heater and may include a heating portion H and a non-heating portion N. [

The defrost heater (8) can be provided with the heat generating portion (H) between the pair of non-heat generating portions (N). The sheath heater may include a pair of spaced apart terminals, a heat line connected to the pair of terminals, and a sheath surrounding the pair of terminals and the heating line.

The non-heat generating portion N of the defrost heater 8 is a region in which the terminal is located and the heat generating portion H of the defrost heater 8 is a region in which the heat wire is located, And can be transmitted to the non-heat generating portion N by conduction.

The defrost heater 8 has a configuration in which the heat generating portion H is at a high temperature and the non-heat generating portion N is lower in temperature than the heat generating portion H so that the frost of the evaporator 4 can be defrosted optimally, As shown in Fig.

The defrost heater 8 is constructed such that the heat generating portion H is closer to the tube inlet portion 41 of the defrost sensor 6 than the tube inlet portion 41 and the non-heat generating portion H is located closer to the tube inlet portion 41 It can be installed closer to the defrosting sensor 6 than the defrosting sensor 6.

The defrost heater 8 may be formed in a shape that the heating portion H is curved in a U shape and the non-heating portion N may be arranged in a direction orthogonal to the heating portion H. [ The defrost heater may be a U-shaped bent shape when viewed from above, and a L-shaped bent shape when viewed from the front or rear side.

FIG. 3 is a front view showing the refrigerator compartment evaporator and the refrigerator compartment defroster heater shown in FIG. 2, FIG. 4 is a plan view showing the freezer compartment evaporator and the refrigerator compartment defroster heater shown in FIG. 2, And a defrosting chamber defrost heater.

The refrigerating compartment evaporator 4A may include a refrigerant tube 43 having a tube inlet portion 41 and a tube outlet portion 42 and a heat conductive fin 44 coupled to the refrigerant tube 43.

The refrigerating compartment evaporator 4A may include a plurality of heat conductive fins 44 and the refrigerating compartment evaporator 4A may include a pair of end plates 48 and 49 positioned beside the outermost heat conductive fins 44 . The plurality of heat conductive fins 44 may be disposed apart from each other between the pair of end plates 48 and 49.

The tube inlet portion 41 of the refrigerating compartment evaporator 4A may be located at one side of the left and right sides of the refrigerating compartment evaporator 4A. The tube inlet portion 41 of the refrigerating compartment evaporator 4A may be positioned closer to any one of the pair of end plates 48 and 49.

The refrigerating compartment defrost sensor 6A senses the temperature around the refrigerating compartment evaporator 4A or the refrigerating compartment evaporator 4A and the refrigerating compartment defrost sensor 6A is mounted on the refrigerating compartment evaporator 4A by the refrigerator compartment defroster sensor holder 61 .

The defrosting defrost sensor holder 61 may be mounted on the other one of the pair of end plates 48 and 49. Hereinafter, an end plate on which the refrigerating chamber defrosting sensor holder 51 of the pair of end plates 48 and 49 is mounted will be referred to as a sensor mounting end plate 49. [

A hook may protrude from one of the refrigerator compartment defroster sensor holder 61 and the sensor mounting end plate 49 and the other may be formed with a hook hole to which the hook is elastically inserted and hooked.

The fastening holes of the refrigerator compartment defroster sensor holder 61 and the sensor mounting end plate 49 can be respectively formed and fastening members such as screws can be fastened to the fastening holes of the refrigerator compartment defroster sensor holder 61 and the sensor mounting end plate 49, It is of course possible to be fastened to the base plate.

The refrigerating compartment defrost sensor 6A may be installed on the opposite side of the tube inlet 41 of the refrigerating compartment evaporator 4A. The refrigerating compartment defroster sensor holder 61 may be detached from the opposite side of the tube inlet 41 of the refrigerating compartment evaporator 4A.

Each of the tube inlet 41 and the tube outlet 42 of the refrigerating compartment evaporator 4A can be located on one side of the left and right sides of the refrigerating compartment evaporator 4A and the tube inlet 41 of the refrigerating compartment evaporator 4A, May be connected to the evaporator inlet tube 45 and the tube outlet portion 42 of the refrigerating chamber evaporator 4A may be connected to the evaporator outlet tube 46 or the accumulator 47.

When the refrigerating compartment defrost sensor 6A is positioned at one side of the left and right sides of the refrigerating compartment evaporator 4A together with the tube inlet 41 and the tube outlet 42, the tube inlet 41 is connected to the evaporator inlet tube 45, And the joining process in which the tube outlet portion 42 is joined to the evaporator outlet tube 46 or the accumulator 47 may be complicated and the mounting operation of the refrigerating compartment defrost sensor 6A may be complicated have.

On the other hand, when the refrigerating compartment defrost sensor 6A is provided on the opposite side of the tube inlet 41, a joining step in which the tube inlet 41 is joined to the evaporator inlet tube 45, The joining process to be connected to the tube 46 or the accumulator 47 can be simplified, and the operation of mounting the refrigerator compartment defrost sensor 6A may not be difficult.

The refrigerating compartment defrost heater 8A heats the refrigerating compartment evaporator 4A to defrost the frost of the refrigerating compartment evaporator 4A so that the heat generating portion H can be positioned between the pair of non-heat generating portions N. [

 The refrigerating compartment defrost heater 8A is configured such that the heat generating portion H is at a high temperature and the non-heat generating portion N is lower in temperature than the heat generating portion H. When the heat generating portion H is in contact with the tube inlet portion 41 and the refrigerating compartment defrost sensor 6A, The non-heat generating portion H can be installed closer to the defrosting sensor 6 among the tube inlet portion 41 and the refrigerating compartment defrosting sensor 6A.

The defrosting chamber heater 8A may be formed in a shape that the heating portion H is curved in a U shape and the non-heating portion N may be arranged in a direction orthogonal to the heating portion H. [ The defrost heater may be a U-shaped bent shape when viewed from above, and a L-shaped bent shape when viewed from the front or rear side.

The refrigerator may have a relatively low temperature region in a region close to the tube inlet portion 41 and the tube inlet portion 41 in cooling the refrigerating chamber F than in other regions. A region close to the tube inlet portion 41 and the tube inlet portion 41 of the refrigerator compartment evaporator 4A may have a relatively large amount of freezing and frost may be concentrated during the cooling of the refrigerating compartment R. [

The area close to the heat generating part H in the refrigerating compartment evaporator 4A may be a high temperature area A1 and the area close to the non-heat generating part N may be in the high temperature area Temperature region A2 (see Fig. 3) which is relatively low in temperature. The hot zone temperature of the cold storage chamber evaporator 4A may be higher than the low temperature zone temperature of the cold storage chamber evaporator 4A when the cold storage chamber defroster heater 8A is turned on.

The refrigerating compartment defrost sensor 6A can be located in the high temperature region A1 of the refrigerating compartment evaporator 4A and the low temperature region A2 of the low temperature region A2.

The refrigerating compartment evaporator 4A is heated at a higher temperature in the vicinity of the heating section H and relatively lower in temperature away from the heat generating section H. In Figure 3, The high temperature region A1 and the low temperature region A2 are distinguished from each other and the area of each of the high temperature region A1 and the low temperature region A2 is shown in Fig. Of course, it is not limited.

FIG. 6 is a front view showing the freezer compartment evaporator and the freezer compartment defrost heater shown in FIG. 2, FIG. 7 is a plan view showing the freezer compartment evaporator and the freezer compartment defrost heater shown in FIG. 2, And a defrosting chamber defrost heater.

The freezer compartment evaporator 4B may include a refrigerant tube 43 having a tube inlet portion 41 and a tube outlet portion 42 and a heat conductive fin 44 coupled to the refrigerant tube 43.

The freezer compartment evaporator 4B may include a refrigerant tube 43, a heat conductive fin 44 and a pair of end plates 48 and 49 like the refrigerating compartment evaporator 4A.

The tube inlet portion 41 of the freezer compartment evaporator 4B may be located at one side of the left and right sides of the freezer compartment evaporator 4B. The tube inlet portion 41 of the freezer compartment evaporator 4B may be located closer to any one of the pair of end plates 48 and 49.

The freezer compartment defrost sensor 6B detects the temperature around the freezer compartment evaporator 4B or the freezer compartment evaporator 4B.

The freezer compartment defrost sensor 6B may be installed on the opposite side of the tube inlet 41 of the freezer compartment evaporator 4B.

The freezer compartment defrost sensor 6B can be mounted on the freezer compartment evaporator 4B by the freezer compartment defroster sensor holder 62. [ The freezer compartment defroster sensor holder 62 may be detached from the tube inlet 41 of the freezer compartment evaporator 4B.

The tube inlet portion 41 of the freezer compartment evaporator 4B may be located closer to any one of the pair of end plates 48 and 49 and the freezer compartment defroster sensor holder 62 may be located in a pair Can be mounted to the other (49) of the end plates (48) and (49).

The configuration in which the freezer compartment defroster sensor holder 62 is mounted on the freezer compartment evaporator 4B is the same as the configuration in which the refrigerator compartment defroster sensor holder 61 is mounted on the refrigerator compartment evaporator 4A, It is omitted.

 The freezing chamber defrost heater 8B heats the freezing compartment evaporator 4B to defrost the frost of the freezing compartment evaporator 4B and is provided between the pair of non-heat generating portions N, like the refrigerating chamber defrost heater 8A, May be located.

The shape and arrangement of the freezer compartment defrost heater 8B may be the same as that of the refrigerating compartment defrost heater 8A, and a detailed description thereof will be omitted to avoid redundant description.

The area close to the heat generating portion H in the freezing compartment evaporator 4B may be the high temperature region A3 (see FIG. 6), and the region close to the non-heat generating portion N may be located in the high temperature region Temperature region A4 (see Fig. 6) which is relatively low in temperature. When the freezer compartment defroster heater 8B is turned on, the high temperature zone temperature of the freezer compartment evaporator 4B may be higher than the low temperature zone temperature of the freezer compartment evaporator 4B.

The freezer compartment defrost sensor 6B may be located in the high temperature area A3 of the freezer compartment evaporator 4B and the low temperature area A4 of the low temperature area A4.

The freezing chamber evaporator 4B is heated to a higher temperature in the vicinity of the heating section H and relatively lower in temperature away from the heating section H. In Figure 6, The high temperature region A3 and the low temperature region A4 are distinguished from each other and the area of each of the high temperature region A3 and the low temperature region A4 is shown in Fig. Of course, it is not limited.

FIG. 9 is a control block diagram of a refrigerator according to an embodiment of the present invention, and FIG. 10 is a flowchart illustrating an operation method of a refrigerator according to an embodiment of the present invention.

The refrigerator may further include a controller (100) for controlling the defrost heater (8). The control unit 100 can control not only the defrost heater 8 but also the compressor 1, the condensing fan 21, the refrigerating compartment fan 71 and the freezing compartment fan 72. [

The control unit 100 can turn on and off the defrost heater 8 in the defrosting operation.

The controller 100 can turn on and off the refrigerator compartment heater 8A during the defrosting operation of the refrigerator compartment evaporator 4A and turn on the freezer compartment defroster heater 8B during the defrosting operation of the freezer compartment evaporator 4B Off.

The control method of the refrigerator may include the step S2 of turning on the defrost heater 8 when the defrosting operation is started and the step S2 of turning off the defrost heater 8 after the defrost heater 8 is turned on S3) (S3) (S4) (S5) can be performed.

The step S1 of turning on the defrost heater 8 may be the stage of starting the defrosting operation. The control unit 100 can turn on the defrost heater 8 in the start condition of the defrosting operation.

Steps S2, S3, S3, S4 and S5 of turning off the defrost heater 8 may be a step of ending the defrosting operation. The control unit 100 can turn off the defrost heater 8 in the end condition of the defrosting operation. (S2) (S3) (S3) (S4) (S5)

First, the start of defrosting operation will be described in detail.

The control unit 100 can turn off the compressor 1 and the condensing fan 21 under the start condition of the defrosting operation. The controller 100 can turn on at least one of the defrost heater 8, that is, the freezer compartment defroster heater 8A and the refrigerating compartment defrost heater 8B. (S1)

The start of the defrosting operation can be determined by a factor such as a driving integrated time of the compressor 1, a number of times of opening and closing of the door 92 (93), a temperature of the evaporator 4 sensed by the defrost sensor 6 .

In order to start the defrosting operation, the control unit 100 integrates the operation time of the compressor 1 into a counter (not shown) to count the compressor operation cumulative time, and when the cumulative compressor operation cumulative time reaches the reference cumulative time It is determined that the defrosting operation has been started and the defrosting operation can be started.

The control unit 100 can count the operation integration time of the compressor 1 for each of the refrigerator compartment operation and the freezer compartment operation.

The control unit 100 compares the compressor operation cumulative time at the time of operation of the refrigerating compartment with the refrigerating compartment reference cumulative time and determines that the defrosting operation of the refrigerating compartment evaporator 4A is the defrosting start condition It is possible to turn on the refrigerating compartment defrost heater 8A.

The control unit 100 compares the compressor operation cumulative time at the freezer compartment operation time with the freezer compartment reference cumulative time, and when the compressor operation cumulative time at the freezer compartment operation reaches the freezer compartment reference cumulative time, it is the defrosting condition of the freezer compartment evaporator 4B It is possible to turn on the freezer compartment defroster heater 8B.

The control unit 100 counts the driving integration time of the compressor 1 without separately distinguishing the operation of the refrigerator compartment and the freezer compartment and when the driving integrated time of the compressor 1 reaches the reference integration time, It can be determined that defrosting start conditions are satisfied for each freezer compartment evaporator 4B and the refrigerator compartment defroster heater 8A and the freezer compartment defroster heater 8B can be turned on together or sequentially.

The refrigerator compartment evaporator 4A and the freezer compartment evaporator 4B will be referred to as an evaporator 4 in order to avoid redundant explanations and the refrigerating compartment defrost sensor 6A and freezer compartment defrost sensor 6B Will be referred to as a defrosting sensor 6 and the defrosting chamber heater 8A and the freezing chamber defrosting heater 8B will be referred to as a defrost heater 8. [

In the following description, when the defrosting operation of the refrigerating compartment evaporator 4A is completed, the evaporator 4 may be the refrigerating compartment evaporator 4A, the defrosting sensor 6 may be the refrigerating compartment defrosting sensor 6A, 8 may be the defrosting chamber heater 8A.

Conversely, when defrosting operation of the freezer compartment evaporator 4B is completed, the evaporator 4 may be the freezer compartment evaporator 4B, the defrost sensor 6 may be the freezer defrost sensor 6B, and the defrost heater 8 It may be a freezer defrost heater 8B.

The control unit 100 can turn off the defrost heater 8 in the defrosting termination condition. (S2) (S3) (S4) (S5)

The control unit 100 can turn off the defrost heater 8 by considering the temperature sensed by the defrost sensor 6 and the set time (for example, 30 minutes) during the defrosting operation.

The controller 100 turns off the defrost heater 8 in accordance with the temperature sensed by the defrost sensor 6 after the defrost heater 8 is turned on so that the elapsed time after the defrost heater 8 is turned on is the set time The defrost heater 8 can be controlled differently depending on whether or not the defrost heater 8 has passed.

The control unit 100 can turn off the defrost heater 8 if the temperature sensed by the defrost sensor 8 is equal to or higher than the reference defrost termination temperature for a set time (for example, 30 minutes) after the defrost heater 8 is turned on (S2) (S3) (S4)

Here, the reference defrost termination temperature is a reference temperature set for judging the termination of the defrosting operation, which is a reference temperature for judging completion of the defrosting of the refrigerating compartment evaporator 4A or a reference temperature for judging the defrosting termination of the freezing compartment evaporator 4B Lt; / RTI >

The reference defrost termination temperature may be different between the defrosting operation of the refrigerating compartment evaporator 4A and the defrosting operation of the freezing compartment evaporator 4B.

One example of the reference defrost termination temperature may be any temperature (for example, 5 deg. C or 8 deg. C) among room temperature temperatures such as 5 deg. C to 10 deg. C in the refrigerating compartment evaporator defrosting operation.

Another example of the reference defrost termination temperature may be any temperature (for example, 3 DEG C or 5 DEG C) of a normal temperature such as 2 DEG C to 8 DEG C in the freezer compartment evaporator defrosting operation.

The reference defrost termination temperature may be set to the same temperature (for example, 8 DEG C) during the defrosting operation of the refrigerating compartment evaporator 4A and the defrosting operation of the freezing compartment evaporator 4B.

The controller 100 can keep the defrost heater 8 on when the temperature sensed by the defrost sensor 8 is less than the reference defrost termination temperature for a set time (for example, 30 minutes) after the defrost heater 8 is turned on (S2) (S3) (S1)

Then, the control unit 100 determines whether or not the defrosting operation is performed based on the defrost termination temperatures (the reference defrost termination temperature and the variable defrost termination temperature) which are different from each other depending on whether or not the set time (for example, 30 minutes) (S2) (S3) (S5)

After the defrosting operation is started, the control unit 100 can determine the defrosting completion based on the reference defrost termination temperature until the set time is reached. (S2) (S3)

When the set time has elapsed after the defrost heater 8 is turned on, the controller 100 can determine the defrosting completion based on the variable defrost end temperature that is different from the reference defrost end temperature. (S2) (S5)

Here, the variable defrost end temperature may be a temperature higher than the reference defrost end temperature by a predetermined temperature. For example, if the reference defrost termination temperature is set at 8 占 폚, the variable defrost termination temperature may be set at 13 占 폚.

The controller 100 determines whether the temperature detected by the defrost sensor 8 is equal to or higher than the variable defrost end temperature 13 ° C or higher, which is set higher than the reference defrost termination temperature 8 ° C by a predetermined temperature after the defrost heater 8 is turned on, , The defrost heater 8 can be turned off (S2) (S5) (S4)

The control unit 100 determines that the temperature detected by the defrost sensor 8 is less than the variable defrost end temperature 13 ° C set higher than the reference defrost end temperature 8 ° C after the set time since the defrost heater 8 is turned on, , The defrost heater 8 can be kept on (S2) (S5) (S1). In this case, the defrost heater 8 can not be turned off and can be kept on continuously, and the evaporator 4 can be constantly defrosted.

The temperature sensed by the defrost sensor 6 is maintained at the reference defrost termination temperature 8 ° C even though the defrost heater 8 is kept on for the set time (for example, 30 minutes) after the defrost heater 8 is turned on If the evaporator 8 can not be reached, the conception of the evaporator 8 may be an excessive condition.

The control unit 100 sets the end of the defrosting operation to the reference defrost termination temperature 8 DEG C so that the defrosting operation can be terminated after the evaporator 8 has been fully defrosted after the set time (for example, 30 minutes) It can be judged based on the higher variable defrost termination temperature (13 DEG C).

During the above-described control, the defrost heater 8 can continuously raise the temperature of the evaporator 4, and the temperature sensed by the defrost sensor 8 by the temperature increase of the evaporator 4 reaches the variable defrost end temperature 13 ° C. The control unit 100 can turn off the defrost heater 8.

For better understanding of the present invention, for example, when the set time is set to 30 minutes and the reference defrost termination temperature is set to 8 DEG C, the variable defrost termination temperature is set to 13 DEG C .

The controller 100 controls the defrost heater 8 so as not to turn off the defrost heater 8 when the temperature sensed by the defrost sensor 6 is less than 8 占 폚 before 30 minutes have elapsed since the defrost heater 8 was turned on, It can keep on.

The control unit 100 can turn off the defrost heater 8 when the temperature sensed by the defrost sensor 6 is 8 ° C or more before the elapse of 30 minutes since the defrost heater 8 is turned on, Can be terminated.

The control unit 100 controls the defrost heater 8 so as not to turn off the defrost heater 8 when the temperature sensed by the defrost sensor 6 is less than 13 ° C after 30 minutes have elapsed since the defrost heater 8 was turned on, It can keep on.

The control unit 100 can turn off the defrost heater 8 when the temperature sensed by the defrost sensor 6 is 13 ° C or more after 30 minutes have elapsed since the defrost heater 8 is turned on, .

During the above-described control, the defrosting operation can be started in the refrigerating compartment and the freezing compartment in a state in which the evaporator 4 is fully defrosted, and the termination of the defrosting operation in the state where the defrosting of the evaporator 4 is not substantially completed is minimized And the reliability of the defrosting operation can be improved.

 When the defrosting operation is completed, the controller 100 drives the compressor 1 and the condensing fan 20 to drive either the refrigerator compartment fan 71 or the freezer compartment fan 72, The cooling operation for cooling the storage room can be performed.

The controller 100 sets the reference defrost termination temperature (8 deg. C) and the variable defrost termination temperature 13 (13 deg. C) in consideration of the set time (for example, 30 minutes) Deg.] C and the temperature sensed by the defrost sensor 6 can be compared to terminate the defrost operation.

11 is a flowchart illustrating an operation method of a refrigerator according to another embodiment of the present invention.

The method of operating the refrigerator according to the present embodiment may include a step S1 of turning on the defrost heater 8 in the defrost operation start condition and the step S1 of turning on the defrost heater 8 is a step The operation of the refrigerator according to the embodiment is the same as that of the refrigerator according to the embodiment, and a detailed description of the start of the defrosting operation will be omitted below to avoid redundant description.

Hereinafter, the termination of defrosting operation will be described. The present embodiment will be described with reference to an evaporator 4 as a refrigerator compartment evaporator 4A and a freezer compartment evaporator 4B as in an embodiment of the present invention and the refrigerating compartment defrost sensor 6A and the freezer compartment defrost sensor 6B, (6), and the refrigerator compartment defroster heater 8A and the freezer compartment defroster heater 8B will be referred to as defrost heater 8.

The operation method of the refrigerator according to the present embodiment includes steps S12, S13, S14, and S15 of turning on the defrost heater 8 for a minimum defrost setting time (for example, 10 minutes or 15 minutes) (S16) (S17) of turning off the defrost heater 8 when the defrost setting time (for example, 10 minutes or 15 minutes) has elapsed.

Steps S12, S13, and S14 (S15) for turning on the defrost heater 8 during the minimum defrost setting time (for example, 10 minutes or 15 minutes) The defrost heater 8 is not turned off and the minimum defrost setting time (for example, 10 minutes or 15 minutes) is reached even if the reference defroster end temperature (for example, 8 ° C) ), The defrost heater 8 is kept on until the evaporator 4 is defrosted.

The additional defrosting of the evaporator 4 as described above is carried out in such a manner that the first condition in which the desired temperature level of the storage chamber in which the evaporator 4 is cooled is equal to or higher than the set level and the second condition in which the temperature sensed by the defrost sensor 6 And the second condition, which is equal to or greater than the reference defrost termination temperature, is satisfied within a set time (for example, 10 minutes) after it is turned on.

The step of further defrosting the evaporator (4) can be carried out only if neither the first condition nor the second condition is satisfied but only if both the first condition and the second condition are satisfied.

The control unit 100 determines whether the temperature of the storage chamber to be cooled by the evaporator 4 is equal to or higher than the set level and the temperature detected by the defrosting sensor 6 is within the set time (10 minutes) The defrost heater 8 can be turned on for the minimum defrost setting time (for example, 10 minutes or 15 minutes), and when the minimum defrost setting time has elapsed, the defrost heater 8 Can be turned off.

Here, the reference defrost termination temperature may be a temperature set for judging completion of defrosting of the evaporator. In the case of the defrosting operation of the refrigerating compartment evaporator, as in the embodiment of the present invention, any one of the room temperature (For example, 5 deg. C or 8 deg. C) may be set, and in the freezer compartment evaporator defrosting operation, any temperature (for example, 3 deg. C or 5 deg. .

The minimum defrost setting time (for example, 10 minutes or 15 minutes) is set so that the temperature sensed by the defrost sensor 6 is equal to or higher than the reference defrost termination temperature (for example, 8 ° C) And may wait for the defrost heater 8 to be turned off.

The minimum defrost setting time may be set differently according to the desired temperature level (for example, 6 DEG C or 5 DEG C).

The minimum defrost setting time (for example, 10 minutes) in the case where the desired temperature level is high (for example, 6 占 폚) is set to the minimum defrost setting time (for example, For example, 15 minutes).

When the level of the desired temperature is high, the amount of frost formation of the evaporator 4 is relatively small. When the level of the desired temperature is low, the amount of frost formation of the evaporator 4 is relatively large. It is preferable that the minimum defrosting time is set to be shorter than when the level of the desired temperature is low.

Table 1 shows an example of the minimum defrost setting time according to the desired temperature level.

Level of desired temperature 6 ℃ 5 ℃ 4 ℃ 3 ° C 2 ℃ 1 ℃ Minimum Defrost Time 10 minutes 15 minutes 0 minutes 0 minutes 0 minutes 0 minutes

Table 1 is an example of the minimum defrost setting time of the refrigerating compartment evaporator according to the desired temperature of the refrigerating compartment.

When the minimum defrost setting time is set as shown in Table 1 and the setting level is set to 5 占 폚, the desired temperature level is 6 占 폚 or 5 占 폚 and the detected temperature of the defrosting sensor 6 is after the defrosting heater 8 is turned on If the defrost heater 8 is maintained at the minimum defrost setting time (10 minutes or 15 minutes), the defrost heater 8 is maintained at the minimum defrosting set time (10 minutes or 15 minutes) It can be turned off when the set time (10 minutes or 15 minutes) elapses.

The embodiment of this embodiment can compare the time counted from the time when the defrost heater 8 is turned on to the minimum defrost setting time, and another example of this embodiment is that the temperature sensed by the defrost sensor 6 is equal to or higher than the reference defrost end temperature It is possible to compare the counted time with the minimum defrost setting time.

When the time counted from the time point when the defrost heater 8 is turned on is compared with the minimum defrost setting time, when the time counted from the time when the defrost heater 8 is turned on elapses the minimum defrost setting time, Off.

For example, the set time is set to 10 minutes, the minimum defrost set time is set to 10 minutes, and the temperature sensed by the defrost sensor 6 reaches the reference When the defrost termination temperature (for example, 8 DEG C) is reached, the control section 100 can compare the time counted from the time when the defrost heater 8 is turned on to the minimum defrost duration set time 10 minutes.

The controller 100 does not immediately turn off the defrost heater 8 when the temperature detected by the defrost sensor 6 reaches the reference defrost termination temperature (for example, 8 占 폚) The defrost heater 8 can be turned on until the time counted from the time when the defrost heater 8 is turned on reaches the minimum defrost setting time 10 minutes. Min, the defrost heater 8 can be turned off.

That is, the defrost heater 8 can be further turned on and off for two minutes from the time when the temperature sensed by the defrost sensor 6 reaches the reference defrost termination temperature (for example, 8 ° C), and the defrost heater 8 It can be kept on for a total of 10 minutes from the point of time when it is started.

As another example, when the set time is set to 10 minutes, the minimum defrost set time is set to 10 minutes, and when seven minutes have elapsed from the point that the defrost heater 8 is turned on, The control unit 100 can compare the time counted from the time when the temperature detected by the defrosting sensor 6 is equal to or higher than the reference defrost termination temperature with the minimum defrost setting time of 10 minutes .

In this case, the controller 100 does not immediately turn off the defrost heater 8 when the temperature sensed by the defrost sensor 6 reaches the reference defrost termination temperature (for example, 8 占 폚) The defrost heater 8 is kept ON until the time counted from the time when the sensed temperature is equal to or higher than the reference defrost termination temperature (for example, 8 DEG C) reaches the minimum defrost setting time 10 minutes, The defrost heater 8 can be turned off when the time counted from the point at which the sensed temperature is equal to or higher than the reference defrost end temperature reaches the minimum defrost setting time of 10 minutes.

That is, the defrost heater 8 can be further turned on and off for 10 minutes from the time when the temperature sensed by the defrost sensor 6 reaches the reference defrost termination temperature (for example, 8 ° C) Can be kept on for a total of 17 minutes from the point of time when it is started.

The frost that is conceived on the evaporator 4 can be conceived in a different pattern depending on the refrigerant passing through the evaporator 4. [ When the desired temperature level of the storage compartment (freezer compartment or refrigerating compartment) is equal to or higher than the set level, the operation rate of the compressor 1 is low, so that the evaporator 4 is partly filled with the frost mainly in the inlet tube portion 41 of the evaporator 4 The frost can not be concealed on the opposite side of the inlet tube portion 41 of the evaporator 4, or the frost amount of the frost can be small. In this case, the evaporation amount of the evaporator 4 is not uniform and can be wiped around the inlet tube portion 41.

The defrosting sensor 6 can detect the temperature of the evaporator 4 at a high level when the defrosting device 4 is attached to the defrosting device 4, The defrost heater 8 can be turned off in a state where the frost of the inlet tube portion 41 of the evaporator 4 is not sufficiently removed.

When the desired temperature level of the storage compartment (the freezer compartment or the freezer compartment) is equal to or higher than the set level and the defrost heater 8 is kept ON for the minimum defrost setting time and the defrost heater 8 is terminated, It is possible to minimize the deflection of the same evaporator 4.

The operation method of the refrigerator according to the present embodiment is a method of operating the defrost heater 8 when the temperature sensed by the defrost sensor 6 is equal to or higher than the reference defrost termination temperature after the set time (10 minutes) (S12) (S13) (S17) of turning off the display device

The control unit 100 can turn off the defrost heater 8 when the temperature sensed by the defrost sensor 6 is equal to or higher than the reference defrost termination temperature after the set time (10 minutes) after the defrost heater 8 is turned on.

Since the defrost heater 8 has heated the evaporator 4 for at least the set time, the evaporator 4 has been sufficiently defrosted and the additional heating by the defrost heater 8, that is, without additional defrosting of the evaporator 4, 100 can turn off the defrost heater 8 and can terminate the defrosting operation of the evaporator 4.

That is, if the temperature sensed by the defrost sensor 6 does not reach the reference defrost termination temperature for the set time after the defrost heater 8 is turned on and the reference defrost termination temperature is reached after the set time has elapsed, 100 can immediately turn off the defrost heater 8 without further defrosting of the evaporator 4.

The operation method of the refrigerator according to the present embodiment is such that the temperature detected by the defrost sensor 6 is equal to or higher than the reference defrost termination temperature within the set time (10 minutes) after the defrost heater 8 is turned on, (S12) (S13) (S14) (S17) of turning off the defrost heater 8 when the desired temperature level of the storage chamber is below the set level.

The control unit 100 determines whether the temperature detected by the defrosting sensor 6 is equal to or higher than the reference defrost termination temperature within a set time (for example, 10 minutes) after the defrost heater 8 is turned on, When the desired temperature level is lower than the set level, the defrost heater 8 can be turned off. In this case, the controller 100 can turn off the defrost heater 8 at a time point when the temperature sensed by the defrost sensor 6 is equal to or higher than the reference defrost termination temperature.

The present embodiment considers whether or not the additional defrosting of the evaporator 4 is taken into consideration only when the desired temperature level of the storage room in which the evaporator 4 is cooled is equal to or higher than the set level and the desired temperature level of the storage room, , The defrost heater 8 can be turned off without additional defrosting of the evaporator 4. [

If the desired temperature level of the storage room where the evaporator 4 is cooled is below the set level, frost can be conceived on the entire area of the evaporator 4, in which case the defrosting of the evaporator 4 is not excessive, 100 can turn off the defrost heater 8 without additional defrosting of the evaporator 4.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

4: Evaporator 6: Defrost sensor
8: defrost heater 41: tube inlet part
100:

Claims (14)

An evaporator;
A defrost sensor for sensing a temperature around the evaporator and the evaporator;
A defrost heater for defrosting the evaporator;
And a control unit for turning off the defrost heater according to a temperature sensed by the defrost sensor after the defrost heater is turned on,
The control unit
The defrost heater is turned off when the temperature detected by the defrost sensor is equal to or higher than the reference defrost termination temperature within a set time after the defrost heater is turned on,
And turns off the defrost heater when the temperature sensed by the defrost sensor is equal to or higher than the variable defrost end temperature which is higher than the reference defrost end temperature. The method according to claim 1,
The evaporator has a heat transfer fin coupled to a refrigerant tube having a tube inlet portion and a tube outlet portion
Wherein the tube inlet portion is located at one side of the evaporator,
The defrost sensor is provided on the opposite side of the tube inlet of the evaporator,
Wherein the defrost heater has a heat generating portion closer to the tube inlet portion and a tube inlet portion of the defrost sensor, and a non-heating portion is disposed closer to the tube inlet portion and the defrost sensor than the defrost sensor. An evaporator;
A defrost sensor for sensing a temperature around the evaporator and the evaporator;
A defrost heater for defrosting the evaporator;
And a control unit for turning off the defrost heater according to a temperature sensed by the defrost sensor after the defrost heater is turned on,
The control unit
When the desired temperature level of the storage chamber in which the evaporator is cooled is equal to or higher than the set level and the temperature detected by the defrosting sensor is equal to or higher than the reference defrost termination temperature within the set time after the defrost heater is turned on, On,
And turns off the defrost heater when the minimum defrost setting time has elapsed. The method of claim 3,
The evaporator has a heat transfer fin coupled to a refrigerant tube having a tube inlet portion and a tube outlet portion
Wherein the tube inlet portion is located at one side of the evaporator,
The defrost sensor is provided on the opposite side of the tube inlet of the evaporator,
Wherein the defrost heater has a heat generating portion closer to the tube inlet portion and a tube inlet portion of the defrost sensor, and a non-heating portion is disposed closer to the tube inlet portion and the defrost sensor than the defrost sensor. The method of claim 3,
And the minimum defrost setting time is set to be different according to the level of the desired temperature. The method of claim 3,
Wherein the minimum defrost setting time when the level of the desired temperature is high is shorter than the minimum defrost setting time when the level of the desired temperature is low. The method of claim 3,
Wherein the control unit turns off the defrost heater when the temperature sensed by the defrost sensor is equal to or higher than the reference defrost termination temperature after the set time. The method of claim 3,
Wherein the control unit turns off the defrost heater when a temperature sensed by the defrost sensor is equal to or higher than a reference defrost termination temperature within the set time and a desired temperature level of the storage room in which the evaporator is cooled is less than a preset level. An evaporator; A defrost sensor for sensing a temperature around the evaporator or the evaporator; And a defrost heater for defrosting the evaporator, the method comprising:
Turning on the defrost heater when the defrost operation start condition is satisfied;
And turning off the defrost heater after the defrost heater is turned on,
The step of turning off the defrost heater includes:
The defrost heater is turned off when the temperature detected by the defrost sensor is equal to or higher than the reference defrost termination temperature within a set time after the defrost heater is turned on,
And turning off the defrost heater when the temperature detected by the defrost sensor is equal to or higher than the variable defrost end temperature which is higher than the reference defrost end temperature after the set time. An evaporator; A defrost sensor for sensing a temperature around the evaporator or the evaporator; And a defrost heater for defrosting the evaporator, the method comprising:
Turning on the defrost heater when the defrost operation start condition is satisfied;
When the desired temperature level of the storage chamber in which the evaporator is cooled is equal to or higher than the set level and the temperature sensed by the defrost sensor is higher than the reference defrost termination temperature within the set time after the defrost heater is turned on, ;
And turning off the defrost heater when the minimum defrost set time has elapsed. 11. The method of claim 10,
Wherein the minimum defrost setting time is set to be different according to a level of the desired temperature. 11. The method of claim 10,
Wherein the minimum defrost setting time when the level of the desired temperature is high is shorter than the minimum defrost setting time when the level of the desired temperature is low. 11. The method of claim 10,
And turning off the defrost heater when the temperature detected by the defrost sensor is equal to or higher than the reference defrost termination temperature after the set time. 11. The method of claim 10,
And turning off the defrost heater when the temperature sensed by the defrost sensor is equal to or higher than the reference defrost termination temperature within the set time and the desired temperature level of the storage room in which the evaporator is cooled is less than the set level .

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