KR20140097863A - Refrigerator and Control method of the same - Google Patents

Abstract

The present invention relates to a refrigerator comprising a main body having a freezing compartment; a freezing cycle apparatus installed in the main body, and having a compressor, a condenser, a hot-line, an expansion unit, and an evaporator through which a refrigerant sequentially passes; a blowing fan circulating air, which is in the freezing compartment, in the evaporator and the freezing compartment; a condensing fan blowing the air to the condenser; and a humidity sensor sensing humidity. The refrigerator according to the present invention has a first mode whereby the compressor receives a first power and the condensing fan is driven at a first rotation speed when temperature in the freezing compartment is unsuitable and the humidity sensed by the humidity sensor is lower than a predetermined value; and a second mode whereby the compressor receives a second power higher than the first power and the condensing fan is driven at a second rotation speed lower than the first rotation speed when the temperature in the freezing compartment is unsuitable and the humidity sensed by the humidity sensor is higher than or equal to the predetermined value, wherein the second mode allows the temperature of the refrigerant flowing into the hot-line to be raised to improve an anti-condensation effect due to the hot-line.

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 in which a condensing fan blows air to a condenser and a method of operating the same.

2. Description of the Related Art Generally, a refrigerator is a device for cooling a storage room such as a refrigerator compartment and a freezer compartment by using a refrigeration cycle device including a compressor, a condenser, an expansion mechanism and an evaporator.

The refrigerator may include a main body having a storage room such as a freezer compartment, a door connected to the main body and opening and closing the storage compartment, a blowing fan for circulating air in the storage compartment to the evaporator and the storage compartment, and a condensing fan for blowing air to the condenser.

The refrigerator has a temperature difference between the inside and the outside, and when the outside environment is hot and humid, dew may form on the portion of the main body which is in contact with the door. This is because the indoor air at room temperature is transferred to the cold air at low temperature and the dew point is generated as the cool air temperature at low temperature rises. When the door is opened, dew is formed at a portion where the door and the main body are in contact with each other due to a temperature difference between the inside of the refrigerator and the outside of the refrigerator.

When a hot line connected to the condenser is installed in the main body of the refrigerator, the dew can be removed while the refrigerant passes through the hot line.

The refrigerator according to the related art has a problem that the temperature of the refrigerant flowing into the hot line may be low and the effect of preventing dew formation due to the hot line may be low when the heat radiation performance of the condenser is high.

According to an aspect of the present invention, there is provided a refrigerator comprising: a main body having a freezing chamber formed therein; A refrigeration cycle device installed in the main body and including a compressor, a hot line, an expansion mechanism, and an evaporator, through which the refrigerant sequentially passes, a condenser, A blowing fan for circulating air in the freezing compartment to the evaporator and the freezing compartment; A condensing fan for blowing air to the condenser; Wherein the first power is input to the compressor when the freezer compartment temperature is unsatisfactory and the humidity sensed by the humidity sensor is less than the set value, and the condensing fan is driven by the first rotational speed Mode and the refrigerator compartment temperature are unsatisfactory and the humidity detected by the humidity sensor is equal to or higher than the set value, a second power higher than the first power is input to the compressor and the condensing fan is driven at a second rotation speed lower than the first rotation speed And has a second mode.

A method of operating a refrigerator according to the present invention includes: sensing a humidity by a humidity sensor; When the detected humidity is less than the set humidity and the freezer compartment temperature is unsatisfactory, the condensing fan for blowing air to the condenser is driven at the first rotational speed, the first power is inputted to the compressor for compressing the refrigerant, And the condenser fan is driven at a second rotational speed lower than the first rotational speed and a second electric power higher than the first electric power is input to the compressor when the freezing chamber temperature is unsatisfactory.

The present invention has an advantage in that when the possibility of dew formation is high due to high humidity, the temperature of the refrigerant flowing into the hot line is increased to enhance the effect of preventing dew formation by the hot line.

1 is a front view showing a main body of a refrigerator according to an embodiment of the present invention,
2 is a plan view of a refrigerator according to an embodiment of the present invention,
3 is a view illustrating a refrigeration cycle apparatus of a refrigerator according to an embodiment of the present invention.
FIG. 4 is a control block diagram of a refrigerator according to an embodiment of the present invention;
FIG. 5 is a view illustrating an operation mode according to a freezer compartment temperature in a refrigerator according to an embodiment of the present invention.
FIG. 6 is a flowchart showing an embodiment of a control method of a refrigerator according to the present invention.

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

FIG. 1 is a front view showing the interior of a refrigerator according to an embodiment of the present invention. FIG. 2 is a plan view of a refrigerator according to an embodiment of the present invention. FIG. 3 is a cross- FIG. 4 is a control block diagram of an embodiment of a refrigerator according to the present invention.

The refrigerator of this embodiment includes a main body 2, a refrigeration cycle device 4, a blowing fan 6, a condensing fan 8, and a humidity sensor 10. In the main body 2, a freezing chamber F is formed. The refrigeration cycle device (4) is installed in the main body (2). The refrigeration cycle apparatus 4 includes a compressor 40, a condenser 44, a hot line 46, an expansion mechanism 48 and an evaporator 50 through which the refrigerant sequentially passes. The blowing fan 6 circulates the air in the freezing chamber F to the evaporator 50 and the freezing chamber F. The condenser fan (8) blows air to the condenser (44). The humidity sensor 10 senses the humidity.

The main body 2 may include a freezing chamber door 21 for opening and closing the freezing chamber F. [ In the main body 2, the freezing chamber F and the refrigerating chamber R may be separately formed. The main body 2 may include a refrigerating compartment door 22 for opening and closing the refrigerating compartment R. The main body 2 may include a barrier 24 for partitioning the freezing chamber F and the refrigerating chamber R. [ The main body 2 may include an outer casing 26 forming an outer appearance of the refrigerator and a freezing chamber inner casing 28 disposed inside the outer casing 26 and having a front opening and a freezing chamber F formed therein have. The main body 2 may further include a refrigerating compartment inner casing 30 disposed inside the outer casing 26 and having a refrigerating compartment R formed therein. The main body 2 may be provided with a machine room (not shown) in which the compressor 40 and the like may be installed. The main body 2 may be provided with an evaporator 50 and a cooling chamber C that is cooled while passing air. The cooling chamber (C) may be formed to communicate with the freezing chamber (F). The refrigerator can communicate with at least one of the refrigerator compartment (C) and the freezer compartment (F). The cooling chamber (C) can be formed inside the freezing chamber inner casing (28). The cooling chamber (C) can be formed inside the refrigerating chamber inner casing (30). The cooling chamber C can be formed between the freezing chamber inner casing 28 and the outer case 26. [ The cooling chamber (C) can be formed between the refrigerating chamber inner casing (30) and the outer case (26). The main body 2 can have a freezing chamber F and a cooling chamber C formed in the freezing chamber inner casing 28. The freezing chamber inner casing 28 is provided with a freezing chamber inner casing 28, C may be disposed on the discharge panel 32. The discharge panel 32 may be provided with a freezer compartment cold air discharge passage 33 through which the air cooled by the evaporator 50 is discharged into the freezer compartment F. [ The discharge panel 32 may be provided with a freezing room cool air recovery flow path 34 in which the air in the freezing room F is sucked into the cooling chamber C. [ The barrier 24 may be formed with a cold room discharging channel 35 through which the air in the cooling chamber C or the freezing chamber F is discharged into the refrigerating chamber R. [ The barrier 24 may be formed with a refrigerating room cool air recovery flow path 36 in which air in the refrigerating compartment R is sucked into the cooling chamber C or the freezing chamber F. [ The refrigerator may further include a refrigerating chamber damper 38 for allowing air cooled by the evaporator 50 to be supplied to or blocked from the refrigerating compartment R when the refrigerating compartment further includes a refrigerating compartment R. The refrigerating compartment damper 38 can regulate air blown from the evaporator 50 to the refrigerating compartment R. The refrigerator compartment damper 38 may be installed in the barrier 24 or in the refrigerator compartment R. [ When the refrigerator compartment damper 38 is installed in the barrier 24, the refrigerator compartment damper 38 can be installed in the refrigerator compartment freezing / discharging passage 35 and can control the cool air passing through the refrigerator compartment freezing / discharging passage 35. When the refrigerator compartment damper 38 is installed in the refrigerating compartment R, the refrigerating compartment damper 38 can be installed on the upper portion of the refrigerating compartment R and communicate with the refrigerating compartment cold air discharge passage 33. The refrigerating compartment damper 38 can intermit the cold air that has flowed through the refrigerating compartment cold air discharge passage 33 in the cooling chamber C. [ The cold air can be introduced into the refrigerating compartment R when the refrigerating compartment damper 38 is opened and the cold air can not flow into the refrigerating compartment R when the refrigerating compartment damper 38 is closed.

The compressor 40, the condenser 44, the hot line 46, the expansion mechanism 48, and the evaporator 50 may be connected by a refrigerant passage. The refrigerant passage may be formed by a refrigerant tube through which the refrigerant passes.

The compressor (40) sucks the refrigerant vaporized in the evaporator (50), compresses the refrigerant, and can discharge the compressed refrigerant. The compressor (40) may be connected to the evaporator (50) and the compressor suction flow path (41). The compressor (40) may be connected to the condenser (44) and the compressor discharge passage (42). The refrigerant evaporated in the evaporator 50 can be sucked into the compressor 40 through the compressor suction passage 41 and the refrigerant compressed in the compressor 40 flows to the condenser 44 through the compressor discharge passage 42 Can be informed. The compressor (40) can be installed in a machine room formed in the main body (2). A compressor such as a rotary compressor, a scroll compressor, or a linear compressor can be used as the compressor 40. When a high power is input among the first power and the second power, the compressor 40 can discharge refrigerant of high temperature and high pressure have. The power input to the compressor 40 can be varied by varying the current or varying the voltage.

The condenser (44) can condense the refrigerant compressed in the compressor (40). The condenser 44 may be installed in a machine room formed in the main body 2 or may be installed in the main body 2 so as to be exposed to the outside. The condenser 44 may be connected to a condenser outlet passage 45 through which the refrigerant having passed through the condenser 44 is guided. The refrigerant condensed in the condenser 44 can be led to the hot line 46 through the condenser outlet flow path 45.

The hot line 46 may be installed between the condenser 44 and the expansion mechanism 48 in the refrigerant flow direction. The hot line 46 may be provided to evaporate and remove dew that is formed in the refrigerator by the refrigerant that has passed through the condenser 44. The hot line 46 may be formed by a refrigerant tube installed in a portion of the main body 2 that is in contact with the door. The hot line 46 can be installed inside the main body 2 and can dissipate heat through the outer casing 26. The refrigerant having passed through the condenser 44 can be radiated and condensed while passing through the hot line 46. The hot line 46 can be installed in a portion of the main body 2 where the main body 2 and the freezing chamber door 21 are in contact with each other. The hot line 46 can be installed in a portion of the main body 2 where the main body 2 and the freezing chamber door 21 are in contact with each other. The refrigerator can be connected to the hot line 46 through the condenser outlet flow passage 45. The hot line 46 may be connected to a hot line outlet flow passage 47 through which the refrigerant passing through the hot line 46 is guided.

 The refrigerator may further include a refrigerant control valve (52) installed between the hot line (46) and the expansion mechanism (48) to control the refrigerant. The refrigerant control valve 52 can guide the refrigerant that has passed through the hot line 46 to the expansion mechanism 48 when it is open (open mode). The refrigerant control valve 52 can prevent the refrigerant that has passed through the hot line 46 from flowing to the expansion mechanism 48 in the closed (closed mode) state. The refrigerant control valve 52 may be constituted by a solenoid valve.

The expansion mechanism 48 may expand the refrigerant that has passed through the hot line 46. The expansion mechanism 48 may include a capillary tube or may include an electronic expansion valve such as EEV or LEV. The expansion mechanism 48 may include a plurality of capillary tubes 49A and 49B and may include two capillary tubes 49A and 49B of a first capillary tube 49A and a second capillary tube 49B. (49A) and (49B). The diameters of the first capillary tube 49A and the second capillary tube 49B may be different. The lengths of the first capillary tube 49A and the second capillary tube 49B may be different. The refrigerant control valve 52 may be connected to the hot line outlet flow path 47 and may be connected to the first capillary tube 49A and the first capillary tube connection path 55, And the tube 49B and the second capillary tube connecting passage 56. [ The refrigerant control valve 52 may be a three-way valve. The refrigerant control valve 52 has an open mode in which the refrigerant is guided to at least one of the first capillary tube 49A and the second capillary tube 49B and the open mode in which the first capillary tube 49A and the second capillary tube 49B, It is possible to have a closed mode in which refrigerant is not supplied to all of the pillellar tubes 49B. The refrigerant control valve 52 has a first capillary tube supply mode for guiding the refrigerant to the first capillary tube 49A in the open mode and a second capillary tube supply mode for guiding the refrigerant to the second capillary tube 49B in the open mode. The capillary tube supply mode can be selected. The refrigerant guided to the refrigerant control valve 52 is guided and expanded to the first capillary tube 49A through the first capillary tube connecting passage 55 or the refrigerant guided to the second capillary tube connecting passage 56, To the second capillary tube 49B through the second capillary tube 49B. The first capillary tube 49A and the second capillary tube 49B may be connected to the evaporator 50 by a joint flow passage. The manifold channel includes a first capillary tube outlet channel 57 connected to the first capillary tube 49A, a second capillary tube outlet channel 58 connected to the second capillary tube 49B, And an evaporator inlet flow passage 59 to which the first capillary tube outlet flow passage 57 and the second capillary tube outlet flow passage 58 are connected and which is connected to the evaporator 50. The refrigerant expanded in the expansion mechanism (48) can be guided to the evaporator (50) through the evaporator inlet flow path (59). The expansion mechanism 48 may be installed in the machine room or in the cooling chamber C.

The evaporator (50) can evaporate the refrigerant expanded in the expansion mechanism (48) by heat exchange with the inside and the outside. The evaporator 50 may be connected to the compressor 40 and the compressor suction flow path 41. The evaporator 50 may be installed in the cooling chamber C. The evaporator 50 can be installed in the cooling chamber C together with the blowing fan 6. [ The evaporator 50 can be installed in a smaller number than the storage room F to be cooled and a single refrigerator can cool both the freezing room F and the refrigerating room R. [

The blowing fan 6 can cause the air in the freezing room F to flow to the evaporator 50. The blowing fan 6 blows the air cooled by the evaporator 50 to the freezing chamber F. [ When the refrigerator further includes the refrigerating compartment R, the blowing fan 6 blows the air cooled by the evaporator 50 to the freezing compartment F and the refrigerating compartment R. The blowing fan 6 can function as an evaporating fan (or a freezing compartment fan) for blowing air to the evaporator 50 to heat-exchange the refrigerant passing through the evaporator 50 with air. The blowing fan 6 may be installed in the cooling chamber C together with the evaporator 50. [ The blowing fan 6 may include a motor serving as a driving source and a blower rotated by the motor. The blowing fan 6 may be constituted by a centrifugal fan, and may be constituted by a sirocco fan or a turbo fan. It is needless to say that the blowing fan 6 may be constituted by an axial flow fan.

The condensing fan 8 can be installed in a machine room formed in the main body 2, and can blow air outside the refrigerator into the machine room and blow it to the condenser 44. The refrigerant passing through the condenser 44 can be heat-exchanged with the air blown by the condensing fan 8. The condensing fan 8 can be driven together with the compressor 40. The condensing fan 8 can be stopped together with the compressor 40. [ The condensing fan 8 may include a motor and a fan rotated by the motor, and may be configured as a centrifugal fan or an axial fan. In the condensing fan 8, the motor may be constituted by a variable speed motor, and the rotational speed of the fan may be varied. The condensing fan 8 can be driven at the first rotation speed or at the second rotation speed. The condensing fan 8 can be driven at a high air flow rate when driven at a first rotation speed and can be driven at a low air flow rate when driven at a second rotation speed lower than the first rotation speed. The condensing fan 8 can be driven at the first rotation speed in the normal cooling mode and at the second rotation speed lower than the first rotation speed in the dew condensation prevention mode. The rotation speed of the fan of the condensing fan 8 can be varied according to the voltage change. The air volume of the condensing fan 8 can be changed by the applied voltage. The higher the voltage, the higher the air volume. The lower the voltage, the lower the air volume.

The humidity sensor 10 senses the humidity around the portion where the dew is mainly formed in the main body 2 and can sense the external humidity of the freezing chamber F. [ The humidity sensor 10 may be installed in the freezer compartment door 21 or the refrigerator compartment door 22.

The refrigerator may include a controller 90 for controlling the blower fan 6, the condenser fan 8, and the compressor 40 according to the user's input, the freezer compartment temperature TF, and the humidity. When the refrigerator includes the refrigerant control valve 52, the control unit 90 can control the refrigerant control valve 52.

The refrigerator may include an input unit 92 for receiving a user's command and a freezer compartment temperature sensor 94 for sensing the temperature of the freezer compartment F. [

 The input unit 92 can receive the power input, the freezing chamber desired temperature, the desired temperature of the refrigerator, and the like, and can output a signal according to the input command to the controller 90.

The freezing room temperature sensor 94 is installed in the freezing room F and can output a signal according to the sensed freezing room temperature to the control unit 90. The freezing room temperature sensor 94 senses the temperature of the freezing room F and can output a signal according to the temperature detected by the control unit 90. The control unit 90 controls the freezing room temperature sensor 94 based on the signal output from the freezing room temperature sensor 94 It can be determined whether the freezing compartment temperature (TF) is satisfactory or unsatisfactory.

 The controller 90 can determine the satisfaction or dissatisfaction of the freezer compartment temperature (TF) on the basis of the freezer compartment desired temperature. Here, if the user inputs the freezing room desired temperature to the input unit 92, the freezing room desired temperature may be a criterion for determining satisfaction or dissatisfaction of the freezing room temperature (TF) 92, the initial freezing room desired temperature may be a criterion for determining satisfaction or dissatisfaction with the freezing compartment temperature (TF).

If the temperature sensed by the freezer compartment temperature sensor 94 is lower than the desired freezer compartment temperature, the controller 90 may determine that the freezer compartment temperature TF is satisfied. If the temperature sensed by the freezer compartment temperature sensor 94 is the freezer compartment desired temperature It can be determined that the freezer compartment temperature TF is unsatisfactory.

The controller 90 can determine the satisfaction or dissatisfaction of the freezer compartment temperature (TF) based on the upper limit temperature of the freezer compartment desired temperature and the lower limit temperature of the freezer compartment desired temperature. Here, the upper limit temperature of the freezing room desired temperature and the lower limit temperature of the freezing room desired temperature are error temperatures of the freezing room desired temperature. For example, if the desired freezing room temperature is -17 ° C, the upper limit temperature of the freezing room desired temperature is -16.5 ° C or -16 ° C The lower limit temperature of the freezer compartment desired temperature may be a temperature lower than the freezer compartment desired temperature such as -17.5 ° C or -18 ° C. If the temperature sensed by the freezer compartment temperature sensor 94 is lower than the lower limit temperature of the freezer compartment temperature, the control unit 90 can determine that the freezer compartment temperature TF is satisfactory. If the temperature sensed by the freezer compartment temperature sensor 94 is If it is higher than the upper limit temperature of the freezing compartment desired temperature, it can be judged that the freezing compartment temperature (TF) is unsatisfactory.

FIG. 5 is a view illustrating an operation mode according to a freezer compartment temperature in a refrigerator according to an embodiment of the present invention.

The refrigerator can variably control the compressor 40 and the condensing fan 8 in accordance with the freezing compartment temperature TF and the humidity and if the freezing compartment temperature TF is unsatisfactory and the humidity is high, (TF) is unsatisfactory and the humidity is low, it is possible to control the compressor (40) and the condensing fan (8) so that the hot line (46) And the condensing fan 8 can be controlled.

The humidity sensor 10 senses the humidity and outputs the humidity to the control unit 90. The freezing room temperature sensor 92 senses the temperature of the freezing room F and can output the sensed temperature to the control unit 90. The control unit 90 controls the compressor 40 and the blowing fan 6 in accordance with the value (freezing room temperature) output from the freezing room temperature sensor 92 and the value (humidity) output from the humidity sensor 10 to the condensing fan 8, Can be controlled together. The control unit 90 may control the refrigerant control valve 52 together with the compressor 40 or may control the compressor 40 at a time difference.

5A is a view showing the relationship between the blowing fan 6, the condensing fan 8, the compressor 40 and the refrigerant control valve 52 (see FIG. 5) when the freezing compartment temperature TF is unsatisfactory and the humidity sensed by the humidity sensor 10 is below the set value. (B) of FIG. 5 is a state in which the freezing compartment temperature TF is unsatisfactory and the humidity detected by the humidity sensor 10 is equal to or higher than the set value, the blowing fan 6 and the condensing fan 8 The operation of each of the compressor 40 and the refrigerant control valve 52 is shown.

5 (a), when the refrigerator is unsatisfied with the freezer compartment temperature TF and the humidity detected by the humidity sensor 10 is less than the set value, the first power is input to the compressor 40, (8) is driven at the first rotational speed.

5A, the refrigerator may be operated in the first mode if the freezer compartment temperature TF is unsatisfactory and the humidity sensed by the humidity sensor 10 is less than the set value. The refrigerator can start the compressor 40 in the first mode, can start the blowing fan 6, and can start the condensing fan 8. The refrigerant control valve 52 may be in a closed state until the set time T after startup of the compressor 40 has elapsed. The first mode may include a stabilization mode (A) and a general cooling mode (B). The first mode may be the normal cooling mode (B) after the stabilization mode (A) is performed first. The refrigerator can be operated in the stabilization mode (A) in which the refrigerant control valve (52) is closed while the compressor (40), the blowing fan (6) and the condensing fan (8) are driven. In the stabilization mode (A), the refrigerant in the evaporator (50) can be sucked into the compressor (40) and compressed, and the refrigerant compressed in the compressor (40) can be accumulated in the hot line (46) and the condenser (44).

The refrigerator can open the refrigerant control valve 52 after the stabilization mode A is performed for the set time and the compressor 40 and the blowing fan 6 and the condensing fan 8 can be opened when the refrigerant control valve 52 is opened (B) which is driven in the normal cooling mode. In the normal cooling mode (C), the refrigerant sequentially passes through the compressor (40), the condenser (44), the hot line (46), the refrigerant control valve (52), the expansion mechanism (48) and the evaporator 40). ≪ / RTI > The condensing fan 8 can be driven at a first rotational speed and air can be blown into the condenser 44 to help the refrigerant passing through the condenser 44 heat exchange with the air to condense. The blowing fan 6 blows air to the evaporator 50 to help the refrigerant passing through the evaporator 50 heat-exchange with the air to evaporate. The refrigerant can be condensed while passing through the condenser 44 and can heat the area around the hot line 46 while passing through the hot line 46 and evaporate as it passes through the evaporator 50.

The temperature of the freezing room F can be gradually lowered while the refrigerator is operated in the normal cooling mode B and the normal cooling mode B can be performed for a long time when the load on the freezing compartment is large and if the load on the freezing compartment is small, . The refrigerant control valve 52 maintains the open state while the normal cooling mode B is maintained and the freezer compartment temperature TF can be lowered during the normal cooling mode B. [

The refrigerator can be changed to the freezer compartment temperature (TF) satisfactory during the normal cooling mode (B). The refrigerator can exit the first mode if the freezer compartment temperature (TF) is satisfied during the normal cooling mode (B). The refrigerator can stop the blowing fan 6, the condensing fan 8 and the compressor 40 at the end of the first mode and can close the refrigerant control valve 52. [ The refrigerator can be in the standby mode C after completion of the first mode and the refrigerant no longer flows in the standby mode C and the air cooled by the evaporator 50 is no longer blown It does not.

In the standby mode (C), the temperature of the freezing compartment (F) may gradually increase, and the refrigerator may be changed to a dissatisfied freezing compartment temperature (TF) due to a load variation during the standby mode (C). In this case, if the humidity detected by the humidity sensor 10 is less than the set value, the refrigerator can be repeatedly operated in the first mode as shown in FIG. 5 (a) If the humidity is equal to or higher than the set value, it is possible to operate in the second mode as shown in Fig. 5 (b).

When the humidity detected by the humidity sensor 10 is equal to or higher than the set value, the refrigerator is supplied with a second power higher than the first power by the compressor 40 as shown in FIG. 5 (b) And the second mode in which the condensing fan 8 is driven at a second rotational speed lower than the first rotational speed.

5B, the refrigerator may be operated in the second mode if the freezer compartment temperature TF is unsatisfactory and the humidity sensed by the humidity sensor 10 is equal to or greater than the set value. The refrigerator can start the compressor 40 in the second mode, can start the blowing fan 6, and can start the condensing fan 8. The refrigerant control valve 52 may be in a closed state until the set time T after startup of the compressor 40 has elapsed. The refrigerator may include the stabilization mode (A) and the dew condensation prevention mode (B ') in the second mode of operation. The refrigerator can be operated in the stabilization mode (A) in which the refrigerant control valve (52) is closed while the compressor (40), the blowing fan (6) and the condensing fan (8) are driven. In the stabilization mode (A), the refrigerant in the evaporator (50) can be sucked into the compressor (40) and compressed, and the refrigerant compressed in the compressor (40) can be accumulated in the hot line (46) and the condenser (44).

The refrigerator can open the refrigerant control valve 52 after performing the stabilization mode A for the set time period and the compressor 40 and the blowing fan 6 and the condensing fan 8 can open the normal cooling mode of the first mode (B ') that drives the temperature of the refrigerant flowing into the hot line 46 higher than the temperature of the hot line (B). In the dew condensation preventing mode B ', the compressor 40 can be driven to discharge the refrigerant having a higher temperature and a higher pressure than the normal cooling mode (B). The second power higher than the first power may be input to the compressor 40 during the dew formation prevention mode B 'and the refrigerant of the high temperature and high pressure may be discharged from the compressor 40 have. In the dew condensation prevention mode B ', the condensing fan 8 can be driven by the condenser 44 so that the refrigerant having a higher temperature than the normal cooling mode B flows out. The condensing fan 8 can be driven at a second rotational speed lower than the first rotational speed in the dew condensation preventing mode B 'and the air volume of the air flowing into the condenser 44 is smaller than the normal cooling mode B In the condenser 44, the refrigerant having a relatively higher temperature than the normal cooling mode (B) can be discharged.

In the dew condensation preventing mode B ', the refrigerant is supplied to the compressor 40, the condenser 44, the hot line 46, the refrigerant control valve 52, the expansion mechanism 48, (50), and then sucked into the compressor (40). In the dew condensation preventing mode B ', the blowing fan 6 blows air to the evaporator 50 to help the refrigerant passing through the evaporator 50 heat-exchange with the air to evaporate. The refrigerant can be condensed while passing through the condenser 44 and can heat the periphery of the hot line 46 to a temperature higher than the normal cooling mode B while passing through the hot line 46 and pass through the evaporator 50 And can be evaporated.

The refrigerator can cool the freezing chamber F like the first mode while the refrigerator is operated in the dew condensation preventing mode B 'and the temperature of the freezing chamber F can be gradually lowered during the dew condensation preventing mode B' And the dew condensation prevention mode (B ') is performed for a long time when the freezing room load is large as in the normal cooling mode (B), and can be performed for a short time when the freezing room load is small. The refrigerant control valve 52 maintains the open state while the dew condensation prevention mode B 'is maintained and the freezer compartment temperature TF can be lowered during the dew condensation prevention mode B'.

The freezer compartment temperature (TF) may be changed to satisfactory in the refrigerator during the dew condensation prevention mode (B '). The refrigerator may terminate the second mode if the freezer compartment temperature TF is satisfied during the dew condensation prevention mode B '. The refrigerator can stop the blowing fan 6, the condensing fan 8 and the compressor 40 at the end of the second mode and close the refrigerant control valve 52. [ After the completion of the second mode, the refrigerator may be in a standby mode (C) as in the first mode, the refrigerant no longer flows in the standby mode (C), and the freezer ) Is not blown.

At the time of the standby mode (C), the temperature of the freezing compartment (F) gradually increases, and the freezer compartment temperature (TF) may be dissatisfied due to the load variation during the standby mode (C). In this case, the refrigerator is operated in the first mode if the sensed humidity is less than the set value, and the second mode may be repeated if the sensed humidity is not less than the set value.

FIG. 6 is a flowchart showing an embodiment of a control method of a refrigerator according to the present invention.

The operation method of the refrigerator according to the present invention includes a step of sensing the humidity by the humidity sensor 10. (S1) The humidity sensor 10 may sense the room temperature and output the sensed temperature to the control unit 90. [

The method of operating the refrigerator according to the present invention is characterized in that when the freezer compartment temperature (TF) is unsatisfactory and the sensed humidity is less than the set humidity, the condensing fan 8, which blows air to the condenser 44, is driven at the first rotational speed, The condenser fan 8 is driven at a second rotational speed lower than the first rotational speed when the first power is input to the compressor 40 compressing the refrigerant, the freezer compartment temperature TF is unsatisfactory, And a second power higher than the first power is input to the compressor 40. (S2) (S3) (S4) (S5)

The refrigerator can be operated in the first mode in which the condensing fan 8 is driven at the first rotational speed and the first power is input to the compressor 40 when the detected freezing temperature TF is unsatisfactory and the sensed humidity is lower than the set humidity (S2) (S3) (S4)

The refrigerator is driven at a second rotational speed lower than the first rotational speed when the freezer compartment temperature (TF) is unsatisfactory and the sensed humidity is equal to or higher than the set humidity, and the compressor (40) (S2) < / RTI > (S3) < RTI ID = 0.0 > (S5) <

The refrigerator can be selectively operated in the first mode and the second mode.

The method of operating the refrigerator may open the refrigerant control valve 52 when the set time has elapsed after the first mode or the second mode is started. (S6)

The refrigerant control valve 52 can be opened while the refrigerator is operating in the first mode or in the second mode and when the refrigerant control valve 52 is opened, the refrigerant flows through the compressor 40 and the condenser 44, The hot line 46, the refrigerant control valve 52 and the expansion mechanism 48, and then sucked into the compressor 40.

When the refrigerant control valve 52 is opened during the operation of the first mode, refrigerant of a relatively low temperature and a low pressure is introduced into the condenser 40 as compared with the operation of the second mode and air of a high air volume is blown And the hot line 46 is able to pass the low temperature and low pressure refrigerant through the operation in the second mode.

When the refrigerant control valve 52 is opened during the operation of the first mode, the refrigerant of relatively high temperature and high pressure flows into the condenser 40 at a higher rate than the operation of the first mode and air of a low air volume is blown And the hot line 46 can pass the refrigerant of high temperature and high pressure than the operation of the first mode. It is possible to minimize the dew condensation that may occur when the refrigerant passing through the hot line 46 in the middle of the second mode heats the surroundings and the humidity is high.

The freezer compartment temperature TF can be changed to satisfactory when the refrigerator is in the first mode or in the middle of the second mode and if the freezer compartment temperature TF is satisfied, 6) and the condensing fan (8) and closing the refrigerant control valve (52). (S7) (S8)

When the compressor 40 is stopped, the refrigerant does not circulate through the compressor 40, the condenser 44, the hot line 46, the refrigerant control valve 52 and the expansion mechanism 48, The refrigerator is not blown to the freezer compartment 50, and the refrigerator can be in a standby state until the freezer compartment temperature TF is changed to be unsatisfactory. Then, the operation method of the refrigerator as described above can be repeated.

2: Main body 4: Refrigeration cycle device
6: blowing fan 8: condensing fan
10: Humidity sensor 40: Compressor
44: condenser 46: hot line
48: expansion device 50: evaporator
52: Refrigerant control valve 90:
94: freezer temperature sensor

Claims (2)

A main body having a freezing chamber formed therein;
A refrigeration cycle device installed in the main body and including a compressor, a hot line, an expansion mechanism, and an evaporator, through which the refrigerant sequentially passes, a condenser,
A blowing fan for circulating air in the freezing compartment to the evaporator and the freezing compartment;
A condensing fan for blowing air to the condenser;
And a humidity sensor for sensing humidity,
A first mode in which the first power is input to the compressor and the condensing fan is driven at a first rotational speed if the freezing room temperature is unsatisfactory and the humidity sensed by the humidity sensor is less than a set value,
A second mode in which a second power higher than the first power is input to the compressor and the condensing fan is driven at a second rotation speed lower than the first rotation speed when the humidity detected by the humidity sensor is equal to or higher than a set value, . The humidity sensor sensing the humidity;
When the detected humidity is less than the set humidity and the freezer compartment temperature is unsatisfactory, the condensing fan for blowing air to the condenser is driven at the first rotational speed, the first power is inputted to the compressor for compressing the refrigerant, And if the temperature of the freezing compartment is unsatisfactory, the condensing fan is driven at a second rotational speed lower than the first rotational speed, and a second electric power higher than the first electric power is input to the compressor.

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