Abstract:
An ice making duct for a refrigerator and an ice making method using the same are disclosed. The ice making duct for a refrigerator comprises a cooling duct configured to allow cooling air to flow in a longitudinal direction therein, and to have both ends connected to the ice making compartment such that the cooling air circulates to the ice making compartment, an evaporation coil installed to be wound around the cooling duct and configured to cool air by heat exchange with a refrigerant, and a heat transfer fin provided within the cooling duct.

Description:
RELATED APPLICATIONS 
       [0001]    This application is based on and claims priority to Korean Patent Application No. 10-2015-0085324, filed on Jun. 16, 2015 for inventor Min Bon Koo. The disclosure of this application is incorporated herein in its entirety by reference. 
       FIELD OF THE INVENTION 
       [0002]    The present invention relates to an ice making duct for a refrigerator and an ice making method using the same. 
       BACKGROUND OF THE INVENTION 
       [0003]    A refrigerator is an appliance that serves to store food at low temperatures; it may be configured to store food at temperatures below freezing or at low but above freezing temperatures. 
         [0004]    The temperature inside the refrigerator is maintained at the desired level by cool air that is continuously supplied to the refrigerator. The cool air is continuously produced by a heat exchange operation between air and a refrigerant performed in a refrigeration cycle comprising four sequential phases: compression, condensation, expansion, and evaporation. Cool air is channeled to the inside of the refrigerator and is evenly distributed inside the refrigerator by convection. 
         [0005]    The body of a refrigerator typically has a rectangular hexahedral shape that opens frontward, with a refrigerator compartment and a freezer compartment defined and isolated from one another within the refrigerator body. The open front of the refrigerator body may comprise both a refrigerator compartment door and a freezer compartment door that can open or close the refrigerator compartment and the freezer compartment, respectively. The storage space defined inside the refrigerator may comprise a plurality of drawers, shelves, and boxes designed to store various kinds of food in various optimal states. 
         [0006]    In the related art, a top mount type refrigerator in which the freezer compartment is provided in the upper part of the refrigerator body and the refrigerator compartment is provided in the lower part of the refrigerator body is well known. However, in recent years, for greater convenience to users, a bottom freezer type refrigerator in which the freezer compartment is provided in the lower part of the refrigerator body has been proposed and used. The bottom freezer type refrigerator may be preferable since the more frequently used refrigerator compartment is located in the upper part of the refrigerator body and the less frequently used freezer compartment is located in the lower part of the refrigerator body. However, the bottom freezer type refrigerator is problematic in that to take ice cubes from the freezer compartment, a user must open the freezer compartment door and collect ice cubes while bending. 
         [0007]    In an effort to solve the problem, in recent years, a refrigerator in which an ice dispenser for dispensing ice cubes is provided in a refrigerator compartment door placed in the upper part of a bottom freezer type refrigerator has been proposed and used. In such a refrigerator, an ice making device for making ice cubes may be provided in the refrigerator compartment door or inside the refrigerator compartment. 
         [0008]    For example, in the bottom freeze type refrigerator in which the ice making device is installed in the refrigerating compartment door, air (cooling air) cooled by an evaporator is separately discharged to the freezing compartment and the refrigerating compartment. The cooling air discharged to the freezing compartment side flows to the ice making device along a cooling air supply duct embedded in a sidewall of a main body of the refrigerator and subsequently freezes water, while flowing within the ice making device. Thereafter, the cooling air within the ice making device is discharged to the refrigerating compartment through a cooling air reducing duct embedded in the sidewall of the main body of the refrigerator, lowering an internal temperature of the refrigerating compartment. 
         [0009]    However, since the cooling air of the freezing compartment is channeled to the ice making device via the cooling air supply duct and the cooling air reducing duct, the supply efficiency of the cooling air may be suboptimal. 
         [0010]    In addition, since the cooling air of the freezing compartment side should be moved to the ice making device of the refrigerating compartment door, when the refrigerator is continuously operated, power consumption may increase significantly. 
       SUMMARY OF THE INVENTION 
       [0011]    In view of the above, embodiments of the present invention provide an ice making duct for a refrigerator in which air cooled in a cooling air duct can be directly used to generate ice. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    The above and other aspects and features of the present invention will become apparent from the following description of embodiments, given in conjunction with the accompanying drawings, in which: 
           [0013]      FIG. 1  is a view illustrating a configuration of an ice making duct of a refrigerator in accordance with an embodiment of the present invention; 
           [0014]      FIG. 2  is a cross-sectional view taken along line A-A of  FIG. 1 ; 
           [0015]      FIG. 3  is a block diagram illustrating a refrigerating cycle of the ice making duct of the refrigerator in accordance with an embodiment of the present invention; 
           [0016]      FIG. 4  is a perspective view illustrating the refrigerator in accordance with an embodiment of the present invention; 
           [0017]      FIG. 5  is a view illustrating a state of connection between an ice making compartment and a cooling duct in the refrigerator in accordance with an embodiment of the present invention; 
           [0018]      FIG. 6  is a view illustrating an internal configuration of the ice making compartment of the refrigerator in accordance with an embodiment of the present invention; and 
           [0019]      FIG. 7  is a flowchart illustrating an ice making method using an ice making duct of a refrigerator in accordance with an embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0020]    Hereinafter, embodiments of the present invention will be described in detail with the accompanying drawings. 
         [0021]    As illustrated in  FIGS. 1 to 4 , an ice making duct  200  of the refrigerator in accordance with an embodiment of the present invention may generate ice using air cooled in a cooling duct  210 . 
         [0022]    The refrigerator  1  may include a main body  10 , a barrier  20  that separates the inside of the main body  10  into a refrigerating compartment and a freezing compartment, a refrigerating compartment door  30  for selectively closing the refrigerating compartment on both edges of a front surface of the main body  10 , and a freezing compartment door  40  for closing a front opening of the freezing compartment. 
         [0023]    The refrigerator  1  in accordance with this embodiment is a bottom freeze type refrigerator in which the freezing compartment is positioned in a lower portion thereof, but the present invention is not limited thereto and may be applied to various types of refrigerators. 
         [0024]    The ice making duct  200  may include a cooling duct  210  in which cooling air can flow in a longitudinal direction, an evaporation coil  220  for cooling the cooling duct  210  through conduction, and heat transfer fins provided within the cooling duct  210 . 
         [0025]    The cooling duct  210  may include a cooling channel  211 , a first duct hole  212 , and a second duct hole  213 . 
         [0026]    The cooling channel  211 , a passage in which cooling air flows, may extend in a longitudinal direction within the cooling duct  210 . In particular, the cooling channel  211  has a length sufficient for cooling air; thus, the air, while moving in the cooling channel  211  for a predetermined period of time, may be cooled to a temperature suitable to make ice. 
         [0027]    Further, the first duct hole  212  may be provided at one end of the cooling channel  211  to supply the cooling air to the ice making compartment  110 , and the second duct hole  213  may be provided at the other end of the cooling channel  211  to receive the cooling air from the ice making compartment  110 . For example, the first duct hole  212  may be connected to an upper portion of the ice making compartment  110  and the second duct hole  213  to a lower portion of the ice making compartment  110 , and the cooling air within the cooling duct  210  may move from a lower end of the cooling duct  210  to an upper end thereof. 
         [0028]    The cooling duct  210  may extend to be bent in a vertical direction of the main body  10  such that the cooling duct  210  is sloped in a forward direction of the main body  10  within the main body  10 . For example, the cooling duct  210  may be bent to have a “C” shape in a forward direction of the main body  10 . 
         [0029]    In this manner, since the cooling duct  210  is bent to have a “C” shape, when defrosted water is generated within the cooling duct  210 , the defrosted water may move to the lowermost portion of the cooling duct  210  and may be subsequently discharged to the outside through a separate draining device (not shown). 
         [0030]    The cooling duct  210  is installed in the main body  10  of the refrigerator  1 , and the ice making compartment  110  is provided within the refrigerating compartment door  30  of the refrigerator  1 . The first duct hole  212  and the second duct hole  213  of the cooling duct  210  may be selectively connected to an inlet  310  and an outlet  320  of the ice making compartment  110 , respectively, depending on the open or closed state of the refrigerating compartment door  30 . 
         [0031]    That is, when the refrigerating compartment door  30  is closed, cooling air within the cooling duct  210  may be introduced to the inlet  310  of the ice making compartment  110  through the first duct hole  212 , and the cooling air introduced to the ice making compartment  110  may circulate within the ice making compartment  110  to freeze water within the ice making compartment  110  to make ice. Thereafter, the cooling air within the ice making compartment  110  may be discharged to the second duct hole  213  of the cooling duct  210  through the outlet  320 , and the cooling air discharged from the ice making compartment  110  may be re-cooled in the cooling duct  210  and then introduced again to the inlet  310  of the ice making compartment  110 . 
         [0032]    The evaporation coil  220  may cool air within the cooling duct  210  by heat exchange with a refrigerant. To this end, the evaporation coil  220  is installed to be wound around the cooling duct  210 , and thus, when the refrigerant circulates, depending on the refrigerating cycle, the evaporation coil  220  may cool the cooling duct  210  through conduction. 
         [0033]    The evaporation coil  220  may serve as an evaporator of the refrigerating cycle. For example, the evaporation coil  220  may implement the refrigerating cycle including a process of compression-condensation-expansion-evaporation, together with a compressor  11 , a condenser  12 , and an expansion valve  13 . 
         [0034]    In this embodiment, the configuration of the compressor  11 , the condenser  12 , the expansion valve  13 , and the evaporation coil  220  are provided as a refrigerating cycle for providing cooling air to the ice making compartment  110 , but the configuration may also provide the cooling air to the refrigerating compartment and the freezing compartment of the refrigerator as well. In addition, the configuration of the compressor  11 , the condenser  12 , and the expansion valve  13  may also share a refrigerant with an evaporator (not shown) for providing cooling air to the refrigerating compartment and the freezing compartment. 
         [0035]    The heat transfer fins may be formed of a plurality of radiating fins that protrude inside the cooling duct  210 . The plurality of radiating fins may be arranged to be spaced apart at predetermined intervals within the cooling duct  210 . The heat transfer fins serve to increase an area in which heat is exchanged between air moving in the cooling channel  211  within the cooling duct  210  and a refrigerant moving in the evaporation coil  220 , thereby effectively transferring cold and heat from the refrigerant to the air. 
         [0036]      FIG. 5  is a view illustrating a state of connection between the ice making compartment and the cooling duct in the refrigerator in accordance with an embodiment of the present invention.  FIG. 6  is a view illustrating an internal configuration of the ice making compartment of the refrigerator in accordance with an embodiment of the present invention. 
         [0037]    As illustrated in  FIGS. 5 and 6 , the ice making compartment  110  may be provided in the refrigerating compartment door  30  of the refrigerator  1 . In this embodiment, a case in which the ice making compartment  110  is provided in an upper portion of the refrigerating compartment door  30  is presented as an example, but this is merely illustrative and the ice making compartment  110  may be installed in other position of the refrigerating compartment door  30 . 
         [0038]    The ice making compartment  110  may provide an ice making space  111  in which ice is generated. In addition, an ice maker  120 , an ice bank  130 , and a circulation fan  330  may be provided within the ice making compartment  110 . 
         [0039]    The ice maker  120  may freeze water using cooling air channeled to the ice making space  111  and dispense the ice to the ice bank  130 . The ice bank  130  may be positioned below the ice maker  120  from which it is dispensed, and the ice bank  130  may store the dispensed ice and provide the ice to a user through a dispenser unit (not shown). The circulation fan  330  may move the cooling air from the inlet  310  to the outlet  320 . 
         [0040]      FIG. 7  is a flowchart illustrating an ice making method using an ice making duct of a refrigerator in accordance with an embodiment of the present invention. 
         [0041]    As illustrated in  FIG. 7 , the ice making method of the refrigerator in accordance with an embodiment of the present invention may include the steps of supplying a refrigerant to an evaporation coil (step S 100 ), supplying air to a cooling duct with the evaporation coil wound therearound (step S 200 ), cooling the air by heat transfer fins provided within the evaporation coil (step S 300 ), supplying the cooling air to an ice making compartment for generating ice (step S 400 ), discharging the cooling air within the ice making compartment to the cooling duct (step S 500 ), and re-cooling the discharged cooling air in the cooling duct (step S 600 ). 
         [0042]    In step S 100  of supplying a refrigerant to the evaporation coil, a refrigerant of a refrigerating cycle may be supplied to the evaporation coil. Here, the evaporation coil may form a refrigerating cycle including a process of compression-condensation-expansion-evaporation, together with a compressor, a condenser, and an expansion valve. 
         [0043]    In step S 200  of supplying air to the cooling duct with the evaporation coil wound therearound, air may be supplied to the cooling duct to cool the air. The air supplied to the interior of the cooling duct may move from a lower end to an upper end of the cooling duct. 
         [0044]    In step S 300  of cooling air by heat transfer fins provided within the evaporation coil, air is moved within the cooling duct around which an evaporation coil is wound so as to be cooled. 
         [0045]    Air within the cooling duct may move along a cooling channel, in which the heat transfer fins protrude, while being exchanged with the refrigerant of the evaporation coil for a predetermined period of time. As a result, the air discharged from the cooling duct may be cooled to a temperature (e.g., 14 degrees or lower below zero) suitable to make ice. 
         [0046]    In step S 400  of supplying cooling air to the ice making compartment to generate ice, the air cooled in the cooling duct may be supplied to an ice making space of the ice making compartment through an inlet of the ice making compartment. The cooling air introduced into the ice making space may circulate in the ice making space through the operation of a circulation fan, freezing water within the ice making space. 
         [0047]    In step S 500  of discharging cooling air from the ice making compartment to the cooling duct, the cooling air within the ice making space may be discharged to the cooling duct through an outlet of the ice making compartment. 
         [0048]    In step S 600  of re-cooling the discharged cooling air in the cooling duct, the cooling air introduced to the cooling duct is moved again along the cooling channel of the cooling duct for a predetermined period of time so as to be re-cooled to a temperature lower than necessary for making ice. 
         [0049]    In accordance with the embodiments of the present invention, since ice is generated using cooling air directly cooled in a cooling duct, the cooling efficiency can be enhanced and the supply efficiency of cooling air can be increased. 
         [0050]    In addition, in accordance with the embodiments of the present invention, since cooling air circulates between the cooling duct and an ice making space of the refrigerator door for a short period of time, the loss of cooling air can be effectively reduced and power consumption can also be reduced. 
         [0051]    While the invention has been shown and described with respect to the embodiments, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.