Abstract:
Disclosed herein is a refrigerator in which a cold storage material suitable for a freezing chamber may be packed in a cool pack for the freezer section and/or the refrigerator section to keep the respective sections cooler if there is a power failure.

Description:
RELATED APPLICATION(S) 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2014-0188024, filed on Dec. 24, 2014 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND 
       [0002]    Embodiments of the present disclosure relate to a refrigerator, and more particularly, to a refrigerator that may delay increase in the temperature of a freezing chamber and a refrigerating chamber when a power failure occurs. 
         [0003]    Generally, a refrigerator is an apparatus that includes a storage chamber and a cold air supply device for supplying cold air to the storage chamber to keep food fresh. The inside of the storage chamber is maintained at a temperature in a predetermined range required to keep food fresh. Such a storage chamber of the refrigerator has a door to provide access to the food, where the door is kept closed normally to maintain the temperature of the storage chamber. 
         [0004]    The storage chamber may be divided into a refrigerating chamber and a freezing chamber by a partition wall, and the freezing chamber and the refrigerating chamber may have a freezing chamber door and a refrigerating chamber door, respectively. 
         [0005]    The internal temperature of each of the freezing chamber and the refrigerating chamber is normally maintained by the cold air supply device, but when there is a power failure, the supply of cold air to the freezing chamber and the refrigerating chamber is stopped so the temperature inside the freezing chamber and the refrigerating chamber increases. As the temperature inside the freezing chamber and the refrigerating chamber increases, food or the like stored in the freezing chamber and the refrigerating chamber may spoil. 
         [0006]    In order to alleviate the effects of a power failure, a first cool pack and a second cool pack are respectively provided in the freezing chamber and the refrigerating chamber in order to delay the increase in the internal temperature of the freezing chamber and the refrigerating chamber when a power failure occurs. The first cool pack and the second cool pack may be kept at an appropriate temperature by the cold air when the refrigerator has power. When a power failure occurs, the first and second cold packs may delay temperature increase in the freezing chamber and the refrigerating chamber, respectively. 
         [0007]    The cold storage material in the first cool pack for the freezing chamber goes through a phase change at a temperature of approximately 0° C. or lower to store the cold storage energy. This cold storage material will be referred to as the freezer cold storage material. The cold storage material in the second cool pack for the refrigerating chamber goes through a phase change at a temperature of approximately 6° C. to store the cold storage energy. This cold storage material will be referred to as the refrigerator cold storage material. The refrigerator cold storage material that goes through the phase change at the temperature of approximately 6° C. may cost about ten or more times than the freezer cold storage material. 
         [0008]    In a case of a top mounted freezer (TMF) type refrigerator in which the freezing chamber is provided in the upper portion of the storage chamber and the refrigerating chamber is provided in the lower portion, the refrigerator is produced with low costs, and, therefore, the material cost increase for the second cool pack for the refrigerating chamber may become a burden. 
       SUMMARY 
       [0009]    Therefore, it is an aspect of the present disclosure to provide a refrigerator in which freezer cold storage material used in the cool pack for the freezing chamber may be used in a cool pack for the refrigerating chamber. The cool pack, in general, may act as a cold thermal mass by being cooled by the surrounding air during normal operation of the refrigerator. When power is lost to the refrigerator, the cold thermal mass of the cool pack may absorb heat from the refrigerator to keep the food cold/frozen longer. For ease of explanation, the process of the cool pack being cooled will be referred to as “storing cold storage energy,” and the process of the cool pack absorbing heat will be referred to as “supplying cold storage energy.” 
         [0010]    Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure. 
         [0011]    In accordance with one aspect of the present disclosure, a refrigerator may comprise a main body, a storage chamber inside the main body divided into a freezing chamber and a refrigerating chamber by a partition wall, an evaporator in the freezing chamber configured to generate cold air, and a cold air duct in a rear portion of the refrigerating chamber configured to supply the cold air to the refrigerating chamber via a flow passage, where the cold air duct comprises a first cool pack configured to hold freezer cold storage material. 
         [0012]    An evaporator cover may be in front of the evaporator, and a blowing fan above the evaporator may be configured to blow the cold air to the freezing chamber and the refrigerating chamber. 
         [0013]    The flow passage may include a first flow passage separated from the freezing chamber by the evaporator cover, a second flow passage behind the cold air duct, a connection flow passage through the partition wall that connects the first flow passage and the second flow passage, and a suction flow passage inside the partition wall to allow the cold air to flow from the freezing chamber to the first flow passage via the suction flow passage. 
         [0014]    Also, the evaporator cover may have a discharge port to allow the cold air in the first flow passage to flow to the freezing chamber. There may be a suction port on a bottom surface of the freezing chamber to allow the cold air in the freezing chamber to flow to the suction flow passage. 
         [0015]    A drain unit may be provided below the cold air duct to collect dew, where the dew may form on a front surface of the cold air duct because of temperature difference between an internal temperature of the refrigerating chamber and the cold air in the second flow passage. 
         [0016]    The drain unit may have inclined surfaces inclined downwardly towards a center of the drain unit from both ends, a water storage portion between the inclined surfaces to collect the dew, and a drain port to allow dew collected in the water storage portion to drain outside the main body. 
         [0017]    Also, the cold air duct may comprise the first cool pack, an input port for introducing the freezer cold storage material to the first cool pack, and a plurality of first cold air discharge ports to allow the cold air in the second flow passage to flow to the refrigerating chamber. 
         [0018]    There may be a cold air duct cover in front of the cold air duct and spaced apart from the cold air duct. Also, in the cold air duct cover, there may be a plurality of second cold air discharge ports provided in positions corresponding to the plurality of first cold air discharge ports. 
         [0019]    The refrigerator may also comprise a damper configured to open and close in the connection flow passage, and a control unit for controlling operation of the damper. The control unit may include a capacitor or a battery for providing power to operate the damper when a power failure occurs. 
         [0020]    Also, the control unit is configured to operate the blowing fan when power failure occurs. A second cool pack with the freezer cold storage material is provided inside the freezing chamber. 
         [0021]    In accordance with another aspect of the present disclosure, a refrigerator may include a main body, a storage chamber inside the main body divided into a freezing chamber and a refrigerating chamber by a partition wall, an evaporator in the freezing chamber configured to generate cold air, a flow passage to allow the cold air to flow to the freezing chamber and the refrigerating chamber, and a first cool pack in the freezing chamber and a second cool pack in the storage chamber, where both cool packs have the freezer cold storage material. The first cool pack may be to delay rise of the temperature of the freezing chamber, and the second cool pack may be to delay rise of the temperature of the refrigerating chamber. 
         [0022]    An evaporator cover may be in front of the evaporator, and a blowing fan above the evaporator may be configured to blow the cold air to the freezing chamber and the refrigerating chamber. Also, the flow passage may comprise a first flow passage separated from the freezing chamber by the evaporator cover, a second flow passage behind the cold air duct in a rear portion of the refrigerating chamber, a connection flow passage through the partition wall that connects the first flow passage and the second flow passage, and a suction flow passage inside the partition wall to allow the cold air to flow from the freezing chamber to the first flow passage via the suction flow passage. 
         [0023]    A discharge port may allow the cold air in the first flow passage to flow to the freezing chamber, and a suction port on a bottom surface of the freezing chamber may allow the cold air in the freezing chamber to flow to the suction flow passage. 
         [0024]    The second cool pack may be inside the partition wall, and positioned below the suction flow passage, where cold storage energy stored in the second cool pack may be from the cold air passing through the suction flow passage. Also, a plurality of embossed shapes are provided on a bottom surface of the second cool pack. A cool pack cover may also be provided below the second cool pack, and a plurality of holes may be provided in the cool pack cover. The cold storage energy stored in the second cool pack may be provided to the refrigerating chamber by flow of the cold air through the plurality of holes of the cool pack cover. 
         [0025]    Also, a refrigerant pipe, in which refrigerant is circulated, is provided in an upper portion outside an inner box forming the refrigerating chamber and a rear wall outside the inner box, and the cold storage energy stored in the second cool pack may be provided to the refrigerating chamber via the refrigerant. 
         [0026]    The second cool pack is provided on the bottom surface of the freezing chamber and positioned above the suction flow passage. 
         [0027]    The cold storage energy stored in the second cool pack may be from the cold air flowing in the second flow passage via the suction flow passage and the connection flow passage, and the cold air in the second flow passage may flow in to the refrigerating chamber. 
         [0028]    The second cool pack may be provided in the evaporator cover and cold storage energy stored in the second cool pack may be from the cold air passing through the first flow passage. 
         [0029]    Also, the cold storage energy stored in the second cool pack may be provided to the refrigerating chamber by flow of cold air via the first flow passage connection, the flow passage, the second flow passage, and through the cold air duct. 
         [0030]    Also, a cool pack may be provided in the evaporator cover and another cool pack is provided in the cold air duct, so that cold storage energy stored in the cool packs may be from the cold air flowing through the first flow passage and the second flow passage, respectively. The cold storage energy stored in the cool packs may be provided to the refrigerating chamber. 
         [0031]    In accordance with still another aspect of the present disclosure, a refrigerator includes a main body, a storage chamber inside the main body such that its front surface is open, and divided into an upper freezing chamber and a lower refrigerating chamber by a partition wall, an evaporator in the freezing chamber configured to generate cold air; a suction flow passage that is provided inside the partition wall, and allows the cold air in the freezing chamber, circulated in the freezing chamber to flow out of the freezing chamber, a cool pack, in which cold storage material for the freezing chamber is packed, below the suction flow passage, and configured to store cold storage energy from the cold air flowing in the suction flow passage, and a refrigerant pipe provided in an upper portion outside an inner box forming the refrigerating chamber and a rear wall outside the inner box, so that refrigerant is circulated in the refrigerant pipe. When there is power failure, the refrigerant passing through the refrigerant pipe in the upper portion outside the inner box may condense due the cold storage energy stored in the cool pack, and the condensed refrigerant flows to the refrigerant pipe provided in the rear wall outside the inner box, where the refrigerant may cool the refrigerating chamber through evaporation. 
         [0032]    A drain unit may be provided below the refrigerant pipe inside the refrigerating chamber. Also, the drain unit may comprise inclined surfaces provided to be inclined downwardly towards a center of the drain unit from both ends thereof, a water storage portion provided between the inclined surfaces, and a drain port. 
         [0033]    There may be a blowing fan above the evaporator, where the blowing fan is controlled to be on for a first predetermined time when a compressor is off for a second predetermined time. Also, a time during which the cold air is supplied to the freezing chamber is increased by increasing a time when the compressor is on to compensate for an acceleration of the increase in the temperature of the freezing chamber because the increase in the temperature of the freezing chamber is accelerated by the refrigerant circulated in the refrigerant pipe when the compressor is off. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0034]    These and/or other aspects of the present disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
           [0035]      FIG. 1  is a perspective view of a refrigerator in accordance with one embodiment of the present disclosure; 
           [0036]      FIG. 2  is a view showing a cold air duct and a drain unit in accordance with one embodiment of the present disclosure; 
           [0037]      FIG. 3  is a view showing the drain unit of  FIG. 2  from a different angle; 
           [0038]      FIG. 4  is a view showing a cold air duct and a cold air duct cover in accordance with one embodiment of the present disclosure; 
           [0039]      FIG. 5  is a view showing a rear surface of the cold air duct in accordance with one embodiment of the present disclosure; 
           [0040]      FIG. 6  is a side cross-sectional view of the refrigerator in accordance with one embodiment of the present disclosure; 
           [0041]      FIG. 7  is a view showing a state in which a damper and a control unit are provided in  FIG. 6 ; 
           [0042]      FIG. 8  is a view showing another embodiment of  FIG. 6 ; 
           [0043]      FIG. 9  is a view showing a state in which the damper and the control unit are provided in  FIG. 8 ; 
           [0044]      FIG. 10  is a view showing a state in which a second cool pack is provided inside a partition wall so that it is positioned below a suction flow passage in accordance with another embodiment of the present disclosure; 
           [0045]      FIG. 11  is a view showing a cool pack cover shown in  FIG. 10 ; 
           [0046]      FIG. 12  is a view showing another embodiment of  FIG. 10 ; 
           [0047]      FIG. 13  is a view showing a drain unit shown in  FIG. 12 ; 
           [0048]      FIG. 14  is a view showing the drain unit shown in  FIG. 13  from a different angle; 
           [0049]      FIG. 15  is a view showing a state in which the second cool pack is provided inside a partition wall so that it is positioned above the suction flow passage in accordance with another embodiment of the present disclosure; 
           [0050]      FIG. 16  is a view showing a state in which the damper and the control unit are provided in  FIG. 15 ; 
           [0051]      FIG. 17  is a view showing a state in which the second cool pack is provided in an evaporator cover in accordance with another embodiment of the present disclosure; 
           [0052]      FIG. 18  is a view showing a state in which the damper and the control unit are provided in  FIG. 17 ; 
           [0053]      FIG. 19  is a view showing a state in which the second cool pack is provided in each of the evaporator cover and a cold air duct in accordance with another embodiment of the present disclosure; and 
           [0054]      FIG. 20  is a view showing a state in which the damper and the control unit are provided in  FIG. 19 . 
       
    
    
     DETAILED DESCRIPTION 
       [0055]    Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, where like reference numerals refer to like elements throughout. 
         [0056]    As shown in  FIGS. 1 to 6 , a refrigerator includes a main body  10 , a storage chamber  20  that is provided inside the main body  10  in such a manner that its front surface is open, and doors  30  that are rotatably coupled to the main body  10  to cover the open front surface of the storage chamber  20 . 
         [0057]    The main body  10  includes an inner box  11  that forms the storage chamber  20  and an outer box  13  that forms the appearance, and a heat insulating material  15  is foamed and packed between the inner box  11  and the outer box  13  to prevent the leakage of cold air. 
         [0058]    The storage chamber  20  is divided into a freezing chamber  21 , which may be an upper storage chamber, and a refrigerating chamber  23 , which may be a lower storage chamber, by a partition wall  17 . The freezing chamber  21  and the refrigerating chamber  23  may have shelves  25  on which food or the like can be placed. In addition, a storage container  27  in which food or the like is stored may be provided inside the storage chamber  20 . 
         [0059]    A machine section  29  in which a compressor  41  for compressing a refrigerant and a condenser (not shown) for condensing the compressed refrigerant are installed is provided on a lower-rear side of the main body  10 . 
         [0060]    The freezing chamber  21  and the refrigerating chamber  23  are opened and closed respectively by a freezing chamber door  31  and a refrigerating chamber door  33  that are rotatably coupled to the main body  10 , and a plurality of door trays  35  capable of receiving food or the like may be provided on the inner surface of the doors  30 . 
         [0061]    A cold air supply device  40  for supplying cold air into the storage chamber  20  is provided inside the main body  10 . The cold air supply device  40  may include the compressor  41 , the condenser (not shown), an expansion valve (not shown), an evaporator  43 , a blowing fan  45 , and the like. The compressor  41  and the condenser (not shown) are provided inside the machine section  29  as described above, and the evaporator  43  and the blowing fan  45  may be provided on a rear side of the freezing chamber  21 . 
         [0062]    While the evaporator  43  cools existing air around it, for ease of explanation, the evaporator  43  may be said to generate cold air through heat exchange of the refrigerant. The cold air generated by the evaporator  43  is then forced by the blowing fan  45 , in an upper portion of the evaporator  43 , to the freezing chamber  21  and the refrigerating chamber  23 . An evaporator cover  50  is provided in front of the evaporator  43  on the rear side of the freezing chamber  21 . The evaporator cover  50  may be spaced apart from the evaporator  43  so that the evaporator  43  may be separated from the rest of the freezing chamber  21 . The evaporator cover  50  may have a plurality of discharge ports  51  for discharging the cold air generated by the evaporator  43  into the freezing chamber  21 . 
         [0063]    The cold air generated by the evaporator  43  is blown by the blowing fan  45 , and part of the cold air is supplied to the freezing chamber  21  through the discharge ports  51  of the evaporator cover  50 , and the remaining part of the cold air is supplied to the refrigerating chamber  23  through the cold air duct  100  provided on the rear side of the refrigerating chamber  23 . 
         [0064]    The cold air from the blowing fan  45  may go through a first flow passage  71  that is separated from the freezing chamber  21  by the evaporator cover  50 , a second flow passage  73  behind the cold air duct  100 , a connection flow passage  75  that connects the first flow passage  71  and the second flow passage  73  by passing through the partition wall  17 , and through a suction flow passage  77 . The suction flow passage  77  is provided inside the partition wall  17  to allow the cold air discharged from the first flow passage  71  through the discharge ports  51  of the evaporator cover  50  to be circulated inside the freezing chamber  21  and then to the first flow passage  71  again. 
         [0065]    Thus, a part of the cold air generated by the evaporator  43  is discharged to the discharge ports  51  of the evaporator cover  50  via the first flow passage  71  and supplied to the freezing chamber  21 , and the remaining part of the cold air is transmitted from the first flow passage  71  to the second flow passage  73  via the connection flow passage  75  and supplied into the refrigerating chamber  23  through a first cold air discharge port  105  of the cold air duct  100 . 
         [0066]    The temperatures of the freezing chamber  21  and the refrigerating chamber  23  may be maintained by the cold air generated by the evaporator  43 . The cold air discharged into the freezing chamber  21  through the discharge ports  51  of the evaporator cover  50  is circulated inside the freezing chamber, and then suctioned to the suction flow passage  77  to be transmitted to the first flow passage  71  again, and the cold air transmitted to the first flow passage  71  is discharged into the freezing chamber  21  through the discharge ports  51  again. 
         [0067]    A suction port  21   a  through which the cold air is suctioned is provided on a front side of a bottom surface of the freezing chamber  21  so that the cold air circulated inside the freezing chamber  21  may be suctioned to the suction flow passage  77 . One side of the suction flow passage  77  is connected to the suction port  21   a,  and the other side thereof is connected to the connection flow passage  75 , so that the cold air flowing through the suction port  21   a  may be guided to the first flow passage  71  via the suction flow passage  77  and the connection flow passage  75 . 
         [0068]    Each of the freezing chamber  21  and the refrigerating chamber  23  may maintain its temperature by receiving the cold air generated by the evaporator  43 , but when a power failure occurs, the cold air cannot be supplied to the freezing chamber  21  and the refrigerating chamber  23 , and therefore each of the freezing chamber  21  and the refrigerating chamber  23  cannot maintain its temperature. It should be noted that power failure may refer to any event when power is not supplied to a refrigerator. 
         [0069]    Inside the freezing chamber  21 , a cool pack  60  containing freezer cold storage material  61  is provided to delay an increase in the internal temperature of the freezing chamber  21  when a power failure occurs. The cool pack  60  may be configured to be like a shelf so that food or the like can be stored on the cool pack  60 . The freezer cold storage material  61  for the freezing chamber  21  has a phase change at a temperature of approximately 0° C. or lower to store cold storage energy. 
         [0070]    The cool pack  60  that normally stores the cold storage energy may supply the cold storage energy to the freezing chamber  21  when a power failure occurs, and thereby delay internal temperature increase of the freezing chamber  21 . Inside the refrigerating chamber  23 , a cool pack, which may have the refrigerator cold storage material, should be provided for the refrigerating chamber to delay internal temperature increase of the refrigerating chamber  23  when a power failure occurs, and the refrigerator cold storage material for the refrigerating chamber may cause a phase change at a temperature of approximately 6° C. or lower to store cold storage energy. 
         [0071]    However, the cold storage material for the refrigerating chamber has a price ten or more times that of the cold storage material for the freezing chamber. Therefore, excessive costs may be spent to use a cool pack that uses the refrigerator cold storage material for the refrigerating chamber to delay the increase in the internal temperature of the refrigerating chamber  23  when a power failure occurs. 
         [0072]    When the cool pack  60  with the freezer cold storage material  61  for the freezing chamber is disposed inside the refrigerating chamber  23  to reduce costs, the internal temperature of the refrigerating chamber  23  may be maintained at a temperature of 0° C. or higher, and, therefore, the freezer cold storage material  61  for the freezing chamber may not have a phase change to store the cold storage energy. 
         [0073]    In various embodiments of the present disclosure, the freezer cold storage material  61  for the freezing chamber may be packed inside the cold air duct  100  provided on the rear side of the refrigerating chamber  23  to delay the increase in the internal temperature of the refrigerating chamber  23  when a power failure occurs, while reducing costs versus using the refrigerator cold storage material. 
         [0074]    As shown in  FIGS. 2 to 6 , the cold air duct  100  is disposed on the rear side of the refrigerating chamber  23 , and receives the cold air generated by the evaporator  43  and discharges the received cold air into the refrigerating chamber  23 . 
         [0075]    The cold air duct  100  includes a cold storage material packing portion  101  in which the freezer cold storage material  61  for the freezing chamber is packed, an input port  103  for introducing the freezer cold storage material  61  for the freezing chamber to the cold storage material packing portion  101 , a plug  104  for opening and closing the input port  103 , and a plurality of first cold air discharge ports  105  for supplying the cold air transmitted to the second flow passage  73  to the refrigerating chamber  23 . 
         [0076]    The cold air duct  100  with the freezer cold storage material  61  is positioned inside the refrigerating chamber  23  that maintains its temperature at a temperature of 0° C. or higher. However, the cold air generated by the evaporator  43  and transmitted to the second flow passage  73  provided in the rear surface of the cold air duct  100  maintains the temperature of 0° C. or lower, and, therefore, the freezer cold storage material  61  inside the cold air duct  100  may phase change to store the cold storage energy. 
         [0077]    Since the cold air duct  100  is provided in the refrigerating chamber  23 , the cold storage energy stored in the cold air duct  100  may be supplied to the refrigerating chamber  23  when a power failure occurs, and thereby delay the increase in the internal temperature of the refrigerating chamber  23 . 
         [0078]    The temperature of the refrigerating chamber  23  positioned in a front surface of the cold air duct  100  and the temperature of the second flow passage  73  positioned in the rear surface thereof are different from each other, and, therefore, dew formation may occur on the front surface of the cold air duct  100 . A cold air duct cover  110  spaced apart from the cold air duct  100  may be formed in front of the cold air duct  100 , thereby preventing dew formed on the front surface of the cold air duct  100  from being exposed to the outside when a user opens the refrigerating chamber door  33 . 
         [0079]    A plurality of second cold air discharge ports  111  may be provided in positions corresponding to the plurality of first cold air discharge ports  105  provided in the cold air duct  100  so that the cold air from the first cold air discharge ports  105  may be supplied into the refrigerating chamber  23  through the second cold air discharge ports  111 . 
         [0080]    A drain unit  120  through which the dew formed on the front surface of the cold air duct  100  flows down to be drained is provided in a lower portion of the cold air duct  100 . The drain unit  120  includes inclined surfaces  121  provided to incline downward towards the center of the drain unit  120  from both ends thereof, a water storage portion  123  that is provided flatly between the inclined surfaces  121  of both ends of the drain unit  120  so that the dew flowing down from the cold air duct  100  is stored in the water storage portion  123 , and a drain port  125  that is provided in a center portion of the water storage portion  123  so that the dew stored in the water storage portion  123  is drained outside of the main body  10 . 
         [0081]    The dew that drops from the left and right edge portions of the cold air duct  100  is dropped to the inclined surfaces  121  of the drain unit  120  to be moved to the water storage portion  123  along the inclined surfaces  121 , and the dew stored in the water storage portion  123  is drained to the outside through the drain port  125 . 
         [0082]    As shown in  FIG. 7 , a damper  81  for opening and closing the connection flow passage  75  may be provided in the connection flow passage  75 , and a control unit  83  for controlling the operation of the damper  81  may be provided in the main body  10 . The control unit  83  may include a capacitor (not shown) or a battery (not shown) for operating the damper  81  when a power failure occurs, and may be connected to the blowing fan  45  to control the operation of the blowing fan  45 . 
         [0083]    When power failure occurs, the control unit  83  may operate the damper  81  that opens and closes the connection flow passage  75  to open the damper  81 , and the cold air generated by the evaporator  43  may flow from the first flow passage  71  to the second flow passage  73  via the connection flow passage  75 . In addition, the flow of the cold air may be helped by operating the blowing fan  45  while opening the damper  81 . 
         [0084]    The freezer cold storage material  61  for the freezing chamber is packed in the cold air duct  100  to be used in order to reduce costs, but refrigerator cold storage material  63  for the refrigerating chamber may be packed in the cold air duct  100  to be used, as shown in  FIG. 8 . 
         [0085]    In addition, as shown in  FIG. 9 , even when the refrigerator cold storage material  63  for the refrigerating chamber is packed in the cold air duct  100  to be used, the configuration of the damper  81  and the control unit  83  may be used. 
         [0086]    Next, various embodiments will be described, with reference to  FIGS. 10 to 18 , of using a cool pack with freezer cold storage material to delay an increase in the temperature of the refrigerating chamber when a power failure occurs. 
         [0087]    As shown in  FIGS. 10 to 11 , a configuration in which the cool pack  60  is provided in the freezing chamber  21  to thereby delay an increase in the temperature of the freezing chamber  21  when a power failure occurs may be the same as that shown in  FIG. 6 . For convenience of description, the cool pack  60  shown in  FIG. 6  may be referred to as a first cool pack  210  in  FIG. 10 . 
         [0088]      FIG. 10  shows the first cool pack  210  and the second cool pack  220 . The first cool pack  210  has the freezer cold storage material  61  in order to delay an increase in the temperature of the freezing chamber  21  when a power failure occurs, and the second cool pack  220  also has the freezer cold storage material  61  for the freezing chamber to delay an increase in the temperature of the refrigerating chamber  23  when a power failure occurs. The first cool pack  210  has the same configuration as that shown in  FIG. 6 , so repeated description thereof will be omitted. 
         [0089]    The second cool pack  220  with the freezer cold storage material  61  to delay the increase in the temperature of the refrigerating chamber  23  when a power failure occurs may be provided inside the partition wall  17  below the suction flow passage  77 . The second cool pack  220  provided below the suction flow passage  77  may store cold storage energy from the cold air which has been generated by the evaporator  43 , circulated inside the freezing chamber  21 , and then passed through the suction flow passage  77  so as to be suctioned to the first flow passage  71  again. 
         [0090]    The cold storage energy stored in the second cool pack  220  flows down to delay the increase in the internal temperature of the refrigerating chamber  23  when a power failure occurs, and for this, a space is formed below the second cool pack  220  so that the second cool pack  220  may be adjacent to the refrigerating chamber  23 . 
         [0091]    Dew is formed on a bottom surface of the second cool pack  220  due to temperature difference between the freezing chamber  21  and the refrigerating chamber  23 . Although not shown in the drawings, a plurality of embossed shapes may be provided on the bottom surface of the second cool pack  220  in order to minimize dripping of the dew formed on the bottom surface of the second cool pack  220 . 
         [0092]    In addition, in the space that allows the second cool pack  220  to be adjacent to the refrigerating chamber  23 , a cool pack cover  230  with a plurality of small holes  231  may be provided. Accordingly, the dew dropping from the second cool pack  220  may for the most part be prevented from passing through the cool pack cover  230  but the cold storage energy may be transmitted by air from the second cool pack  220  to the inside of the refrigerating chamber  23  when a power failures occurs. 
         [0093]    As shown in  FIGS. 12 to 14 , when the second cool pack  220  is provided inside the partition wall  17  in a manner to be positioned below the suction flow passage  77 , a refrigerant pipe  240  in which a refrigerant is circulated may be provided in an upper portion outside the inner box  11  and a rear wall outside the inner box  11 . The second cool pack  220  positioned below the suction flow passage  77  may store the cold storage energy from the cold air passing through the suction flow passage  77 . 
         [0094]    The portion of the refrigerant pipe  240  in the upper portion of the outer side of the inner box  11  is positioned below the second cool pack  220 , and therefore the refrigerant passing through the refrigerant pipe  240  may be condensed by the cold storage energy stored in the second cool pack  220 . 
         [0095]    The refrigerant becomes heavier as it condenses and, therefore, the refrigerant flows down the refrigerant pipe  240  provided in the rear wall outside the inner box  12 . This portion of the refrigerant pipe  240  may be in a downward direction from the part of the refrigerant pipe  240  provided in the upper portion of the outer side of the inner box  11 . The refrigerant flowing down to the refrigerant pipe  240  provided in the rear wall outside the inner box  12  may cool the inside of the refrigerating chamber  23  while being evaporated through heat exchange with the inside of the refrigerating chamber  23 . 
         [0096]    The refrigerant passing through the refrigerant pipe  240  provided in the rear wall outside the inner box  12  is evaporated to become lighter, and, therefore, the refrigerant moves to the refrigerant pipe  240  provided in the upper portion of the outer side of the inner box  11  again to be circulated in the refrigerant pipe  240 . 
         [0097]    A valve for controlling the opening and closing of the refrigerant pipe  240  is not provided on the refrigerant pipe  240 , and the refrigerant is circulated by change in specific gravity due to condensation and evaporation of the refrigerant. Therefore, the refrigerant is always circulated in the refrigerant pipe  240  irrespective of whether there is power or not, and the refrigerating chamber  23  is cooled by the refrigerant circulating in the refrigerant pipe  240 . Since the refrigerating chamber  23  is cooled by the refrigerant circulating in the refrigerant pipe  240 , an increase in the temperature of the refrigerating chamber  23  may be delayed during the power failure. 
         [0098]    When the refrigerant circulating in the refrigerant pipe  240  cools the refrigerating chamber  23  due to evaporation, dew may form on an inner surface of the refrigerating chamber  23  of the inner box  11  in which the refrigerant pipe  240  is provided due to temperature difference between the inside and the outside of the refrigerating chamber  23 . A drain unit  280  is provided on an inner surface of the inner box  11  so the dew formed on the inner box  11  flows down and is drained to the outside, and is positioned below a lower end of the refrigerant pipe  240  provided on the rear wall outside the inner box  11 . 
         [0099]    The drain unit  280  has a configuration including an inclined surface  281  provided to incline downwardly towards the center of the drain unit  280  from both ends thereof and a water storage portion  283  may be between the inclined surfaces  281  at both ends of the drain unit  280  so that the dew water flowing down from the inner box  11  is stored in the water storage portion  283 . A drain port  285  may be provided in a center portion of the water storage portion  283  so that the dew water stored in the water storage portion  283  is drained to the outside of the main body  10 , which has the same configuration as that of the drain unit  120  shown in  FIGS. 2 and 3 . However, when dew is formed on the inner box  11  by the refrigerant circulated in the refrigerant pipe  240 , dew is formed on the entire inner box  11  that forms the rear wall of the refrigerating chamber  23 , and therefore it is preferable that the drain unit  280  be longer than that of the drain unit  120  shown in  FIGS. 2 and 3 , and accordingly substantially span the width of the inner box  11 . 
         [0100]    The refrigerant circulated in the refrigerant pipe  240  is continuously circulated even during a power failure as well as when power is present, and, therefore, when the compressor  41  is in an OFF state when power is present, the refrigerating chamber  23  may be excessively cooled by the circulating refrigerant. Accordingly, in order to prevent the refrigerating chamber  23  from being excessively cooled by the circulating refrigerant when the compressor  41  is in the OFF state, the blowing fan  45  may be controlled to blow for a predetermined time when the OFF state of the compressor  41  continues for a predetermined time or more, so that the cold air is circulated. 
         [0101]    In addition, when the blowing fan  45  is controlled to be on for a predetermined time when the OFF state of the compressor  41  continues for a predetermined time or more, the dew formation that occurs in the inner box  11  by the refrigerant circulated in the refrigerant pipe  240  may be prevented. 
         [0102]    When the compressor  41  is in the OFF state when power is present, the cold air inside the freezing chamber  21  may be suctioned into the suction flow passage  77  without supplying the cold air to the freezing chamber  21 , and the second cool pack  220  may store the cold storage energy of the suctioned cold air. This may lead to a higher temperature in the freezing chamber  21  than desired. 
         [0103]    In order to compensate for the increase in the temperature of the freezing chamber  21  in the OFF state of the compressor  41 , an ON state time may be controlled to become longer than the OFF state during the time when power is present. Accordingly, the time during which the cold air is supplied to the freezing chamber  21  may be increased, thereby cooling the freezing chamber  21  to a certain temperature or lower. 
         [0104]    As shown in  FIG. 15 , the second cool pack  220  may be provided on the bottom surface of the freezing chamber  21  above the suction flow passage  77 . The second cool pack  220  provided on the bottom surface of the freezing chamber  21  may store the cold storage energy from the cold air inside the freezing chamber  21  together with the cold air passing through the suction flow passage  77 . 
         [0105]    The cold storage energy stored in the second cool pack  220  may be transmitted to the second flow passage  73  via the connection flow passage  75  using the suction flow passage  77  during a power failure. The cold air transmitted to the second flow passage  73  may be transmitted into the refrigerating chamber  23  through the cold air duct  100 , and thereby delay the increase in the internal temperature of the refrigerating chamber  23  during a power failure. 
         [0106]    In this instance, the configuration of a cold air duct  250  may be the same as the configuration of the cold air duct  100  shown in  FIG. 6 . A difference may be that the heat insulating material  15  is packed in the cold air duct  250  instead of the freezer cold storage material  61  for the freezing chamber. Since the heat insulating material  15  is packed in the cold air duct  250 , it is possible to prevent dew from being formed on the cold air duct  250  due to temperature difference. Since dew formation is prevented, neither a cold air duct cover nor a drain unit is required. 
         [0107]    The damper  81  and the control unit  83  shown in  FIG. 7  may be used even when the second cool pack  220  is provided on the bottom surface of the freezing chamber  21  above the suction flow passage  77  as shown in  FIG. 16 . 
         [0108]    As shown in  FIG. 17 , the second cool pack  220  may be provided in a part of the evaporator cover  50 . When the second cool pack  220  is provided in a part of the evaporator cover  50 , the second cool pack  220  stores the cold storage energy from the cold air inside the freezing chamber  21  together and the cold air passing through the first flow passage  71 . 
         [0109]    The cold storage energy stored in the second cool pack  220  may be transmitted to the second flow passage  73  via the connection flow passage  75  during a power failure, and the cold storage energy transmitted to the second flow passage  73  may be supplied into the refrigerating chamber  23  through the cold air duct  250  and thereby may delay the increase in the internal temperature of the refrigerating chamber  23 . 
         [0110]    The configuration of the damper  81  and the control unit  83  shown in  FIG. 7  may be equally applied even when the second cool pack  220  is provided in the evaporator cover  50  as shown in  FIG. 18 . 
         [0111]    As shown in  FIG. 19 , the second cool pack  220  may be provided in each of the evaporator cover  50  and a cold air duct  260 . When the second cool pack  220  is provided in each of the evaporator cover  50  and the cold air duct  260 , the second cool pack  220  in the evaporator cover  50  may store cold storage energy from the cold air inside the freezing chamber  21  and from the cold air passing through the first flow passage  71 . The second cool pack  220  in the cold air duct  260  may store cold storage energy from the cold air passing through the second flow passage  73 . 
         [0112]    When the second cool pack  220  is provided in the cold air duct  260 , the freezer cold storage material  61  for the freezing chamber  21  is in the cold air duct  260  in the same manner as that in the cold air duct  100  shown in  FIG. 6 . The configuration in which the cold air duct cover  270  is provided on a front surface of the cold air duct  260  may be the same as the configuration of the cold air duct cover  110  shown in  FIG. 6 . 
         [0113]    The cold storage energy stored in the second cool pack  220  may be transmitted to the second flow passage  73  to be transmitted to the refrigerating chamber  23  through the cold air duct  260 , and thereby may delay the increase in the internal temperature of the refrigerating chamber  23 . 
         [0114]    As shown in  FIG. 20 , even when the second cool pack  220  is provided in each of the evaporator cover  50  and the cold air duct  260 , the configuration of the damper  81  and the control unit  83  shown in  FIG. 7  may be applied. 
         [0115]    According to various embodiments of the present disclosure, it is possible to delay the increase in the internal temperature of both the freezing chamber and the refrigerating chamber even when a power failure occurs while still reducing material costs. 
         [0116]    Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.