Patent Publication Number: US-10760848-B2

Title: Refrigerator with a heat dissipation duct for dissipating heat generated by a display

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation Application of U.S. patent application Ser. No. 15/955,440, filed on Apr. 17, 2018, which is a Continuation Application, filed under 35 U.S.C. § 111(a) of International Patent Application No. PCT/KR2017/005400 filed May 24, 2017, it being further noted that foreign priority benefit is based upon Korean Patent Application No. 10-2016-0096483 filed on Jul. 28, 2016. The contents of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a refrigerator with an improved coupling structure of a heat dissipation duct for dissipating heat generated in a display unit. 
     BACKGROUND ART 
     Generally, a refrigerator is an apparatus for keeping food fresh at low temperature by supplying low-temperature cold air to a storage compartment in which the food is stored, and includes a freezing compartment maintained at a freezing temperature or lower and a refrigerating compartment maintained at a temperature slightly above the freezing temperature. 
     Types of refrigerators may be classified depending on forms of a storage compartment and a door, and may be classified as a top mounted freezer (TMF) type refrigerator in which a storage compartment is vertically divided by a horizontal partition, a freezing compartment is formed at an upper side, and a refrigerating compartment is formed at a lower side, and a bottom mounted freezer (BMF) type refrigerator in which a refrigerating compartment is formed at an upper side and a freezing compartment is formed at a lower side. 
     Also, there is a side-by-side (SBS) refrigerator in which a storage compartment is horizontally divided by a vertical partition, a freezing compartment is formed at one side, and a refrigerating compartment is formed at the other side, and there is a French door refrigerator (FDR) type refrigerator in which a storage compartment is vertically divided by a horizontal partition, a refrigerating compartment is formed at an upper side, a freezing compartment is formed at a lower side, and the refrigerating compartment at the upper side is opened or closed by a pair of doors. 
     A display unit configured to display operation information of a refrigerator or receive an operation command for the refrigerator is provided at a door of the refrigerator in some cases. 
     Heat is generated in the display unit during operation, and because the heat may deteriorate operational performance of the display unit and penetrate into a storage compartment to increase a temperature inside the storage compartment, it is preferable that the heat be dissipated to the outside. 
     Although a method in which heat generated in a display unit is conducted to a door of a refrigerator by using a heat dissipation plate has been recently proposed to solve this, heat dissipation efficiency is not satisfactory, and the heat may be transmitted to a user when the user comes into contact with the door. 
     Also, a method in which heat is released using a blower has been proposed, but there are problems in that noise is generated and a structure of a refrigerator including the blower is complex, and a method in which a heat dissipation duct for dissipating heat generated in a display unit is engaged with an inside of a refrigerator door has been proposed, but there is a problem in that assembling the heat dissipation duct is difficult. 
     One side of the heat dissipation duct is assembled to the inside of the refrigerator door by a hook and the like, and then the other side is rotated and assembled to the refrigerator door by a hook and the like, and the heat dissipation duct is engaged with the refrigerator door by an engaging member such as a screw when the heat dissipation duct is assembled to the refrigerator door by the hook and the like. 
     Because the heat dissipation duct is assembled by the hook and the like and then engaged with the refrigerator door by the engaging member such a screw, there are problems in that assembling the heat dissipation duct is difficult, and a separate sealing task for preventing penetration of a heat insulating material, with which the inside of the refrigerator door is filled, into the heat dissipation duct is required even after the heat dissipation duct is assembled. 
     DISCLOSURE 
     Technical Problem 
     It is an aspect of the present disclosure to provide a refrigerator with an improved coupling structure of a heat dissipation duct for dissipating heat generated in a display unit and having and applying the improved heat dissipation duct to a door having a thin thickness such that a problem in which a curve is generated at an exterior of a door when an inside of the door is filled with a heat insulating material is prevented. 
     Technical Solution 
     One aspect of the present disclosure provides a refrigerator including a main body having a storage compartment, and a door configured to open or close the storage compartment, wherein the door includes a door cap coupled to at least one of an upper portion and a lower portion of the door, a display unit provided at a front surface of the door, a heat dissipation cover arranged behind the display unit to form a heat dissipation flow path through which heat generated in the display unit is dissipated, and a heat dissipation duct slidably inserted into the door through the at least one of the upper portion and the lower portion of the door, to be seated between a coupling portion of the heat dissipation cover and an insertion portion of the door cap, wherein the coupling portion and the insertion portion extend lengthwise along the heat dissipation duct to accommodate the heat dissipation duct. 
     The heat dissipation duct may include a suction duct inserted into the lower portion of the door and coupled to a lower portion of the heat dissipation cover and a discharge duct inserted into the upper portion of the door and coupled to an upper portion of the heat dissipation cover. 
     Air inside the heat dissipation may flow path flows due to natural convection, and air outside the door may be suctioned through the suction duct, passes through the heat dissipation flow path, and be discharged to an outside of the door through the discharge duct. 
     Each of the suction duct and the discharge duct may include a rear surface portion in a planar shape and a round portion protruding from a front surface of the rear surface portion in a direction toward the front surface of the door. 
     Each of the suction duct and the discharge duct further may include a reinforcing rib provided between the rear surface portion and the round portion. 
     The coupling portion may include a first coupling portion formed at the lower portion of the heat dissipation cover and coupled to the suction duct and a second coupling portion formed at the upper portion of the heat dissipation cover and coupled to the discharge duct. 
     The first coupling portion and the second coupling portion may be formed to extend from the heat dissipation cover to respectively accommodate one ends of the suction duct and the discharge duct that are respectively inserted into the first coupling portion and the second coupling portion by being slid therein. 
     Each of the first coupling portion and the second coupling portion may include an insertion groove into which the one end of the suction duct or the discharge duct is inserted, a first supporter configured to support an outer portion of the suction duct or the discharge duct inserted into the insertion groove, and a second supporter configured to support an inner portion of the suction duct or the discharge duct inserted into the insertion groove. 
     The second supporter may include a coupling groove to which the reinforcing rib is fitted and coupled. 
     The door cap may include a lower door cap and an upper door cap coupled to the lower portion and the upper portion of the door, respectively, and the insertion portion may include a first inserting portion into which the suction duct is inserted, and the upper door cap includes a second inserting portion into which the discharge duct is inserted. 
     The first inserting portion may include a first insertion hole into which the suction duct is inserted and a first guide configured to guide the suction duct inserted into the first insertion hole to slide therethrough and formed to extend from the lower door cap to accommodate the other end of the suction duct. 
     The second inserting portion may include a second insertion hole into which the discharge duct is inserted and a second guide configured to guide the discharge duct inserted into the second insertion hole to slide therethrough and formed to extend from the upper door cap to accommodate the other end of the discharge duct. 
     The lower door cap may include a recessed portion having an upwardly-recessed shape and in which the first inserting portion is provided, and a lower cover formed of a transparent material, having a light emitting diode (LED) mounted therein, configured to cover the first inserting portion, and including a suction hole that allows the suction duct to communicate with the outside of the door is coupled to the recessed portion. 
     An upper cover configured to cover the second inserting portion may be coupled to the upper door cap, and the upper cover may include a discharge hole that allows the discharge duct to communicate with the outside of the door. 
     Advantageous Effects 
     According to embodiments of the present disclosure, by facilitating coupling of a heat dissipation duct and preventing generation of a curve at an exterior of a door due to the heat dissipation duct when an inside of the door is filled with a heat insulating material, the heat dissipation duct can be applied to a door having a thin thickness. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a refrigerator according to an embodiment of the present disclosure. 
         FIG. 2  is a perspective view illustrating a state in which a door of the refrigerator according to the embodiment of the present disclosure is open. 
         FIG. 3  is a cross-sectional view illustrating an upper door of the refrigerator according to the embodiment of the present disclosure. 
         FIG. 4  is a view illustrating a state in which an upper cover and a discharge duct are disassembled according to an embodiment of the present disclosure. 
         FIG. 5  is a view illustrating a state in which the discharge duct illustrated in  FIG. 4  is coupled to a heat dissipation cover. 
         FIG. 6  is a view illustrating a state in which the upper cover illustrated in  FIG. 5  is coupled to an upper door cap. 
         FIG. 7  is a cross-sectional view illustrating a portion in which a heat dissipation duct is coupled to a coupling portion according to an embodiment of the present disclosure. 
         FIG. 8  is a view illustrating a state in which a lower cover and a suction duct are disassembled according to an embodiment of the present disclosure. 
         FIG. 9  is a view illustrating a state in which the suction duct illustrated in  FIG. 8  is coupled to the heat dissipation cover. 
         FIG. 10  is a view illustrating a state in which the lower cover illustrated in  FIG. 9  is coupled to a lower door cap. 
         FIG. 11  is a view illustrating a lower door cap and a cross-section of a first inserting portion provided at the lower door cap according to an embodiment of the present disclosure. 
     
    
    
     MODES OF THE INVENTION 
     Embodiments described herein and configurations illustrated in the drawings are merely preferred examples of the present disclosure, and various modified examples that may replace the embodiments and the drawings of this specification may be present at the time of filing this application. 
     Like reference numerals or signs presented in each drawing of this specification represent parts or elements that perform substantially the same functions. 
     Terms used in this specification are used for describing the embodiments and are not intended to limit and/or restrict the present disclosure. A singular expression includes a plural expression unless clearly indicated otherwise. In this specification, terms such as “include,” “have,” or the like designate that features, number, steps, operations, elements, parts, or combinations thereof exist and do not preclude the existence of or the possibility of adding one or more other features, numbers, steps, operations, elements, parts, or combinations thereof in advance. 
     Terms including ordinals such as “first,” “second,” and the like used in this specification may be used to describe various elements, but the elements are not limited by the terms, and the terms are only used for the purpose of distinguishing one element from another element. For example, a second element may be referred to as a first element while not departing from the scope of the present disclosure, and likewise, a first element may also be referred to as a second element. The term “and/or” includes a combination of a plurality of related described items or any one item among the plurality of related described items. 
     Terms such as “front end,” “rear end,” “upper portion,” “lower portion,” “upper end,” “lower end,” and the like, when used in the description below, are defined on the basis of the drawings, and a shape and a position of each of the elements are not limited by the terms. 
     Generally, types of refrigerators may be classified depending on forms of a storage compartment and a door. 
     There are a top mounted freezer (TMF) type refrigerator in which a storage compartment is vertically divided by a horizontal partition, a freezing compartment is formed at an upper side, and a refrigerating compartment is formed at a lower side, and a bottom mounted freezer (BMF) type refrigerator in which a refrigerating compartment is formed at an upper side and a freezing compartment is formed at a lower side. 
     Also, there is a side-by-side (SBS) refrigerator in which a storage compartment is horizontally divided by a vertical partition, a freezing compartment is formed at one side, and a refrigerating compartment is formed at the other side, and there is a French door refrigerator (FDR) type refrigerator in which a storage compartment is vertically divided by a horizontal partition, a refrigerating compartment is formed at an upper side, a freezing compartment is formed at a lower side, and the refrigerating compartment at the upper side is opened or closed by a pair of doors. 
     Although a description of a BMF type refrigerator will be given in the present embodiment for convenience of description, embodiments are not limited thereto. 
     Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of a refrigerator according to an embodiment of the present disclosure, and  FIG. 2  is a perspective view illustrating a state in which a door of the refrigerator according to the embodiment of the present disclosure is open. 
     Referring to  FIGS. 1 and 2 , a refrigerator  1  may include a main body  10 , a storage compartment  20  formed inside the main body  10  and having an open front surface, and a door  30  rotatably coupled to the main body  10  to open or close open front surfaces of storage compartments  21  and  22 . 
     The main body  10  may form an exterior of the refrigerator  1 . The main body  10  may include an inner case  11  forming the storage compartment  20  and an outer case  12  coupled to an outer side of the inner case  11  to form the exterior. Also, the main body  10  may include a cold air supply device (not illustrated) configured to supply cold air to the storage compartment  20 . 
     The cold air supply device may include a compressor, a condenser, an expansion valve, an evaporator, a blower fan, a cold air duct, and the like. A heat insulating material  13  may fill a space between the inner case  11  and the outer case  12  of the main body  10  and an inside of the door  30  to prevent leakage of cold air from the storage compartment  20  (see  FIG. 3 ). 
     A machine room (not illustrated) in which a compressor configured to compress refrigerant and a condenser configured to condense the compressed refrigerant are installed may be provided at a lower rear side of the main body  10 . 
     An electronic component part  60  in which various electronic components for operating the refrigerator  1  are arranged may be provided at an upper side of the main body  10 . The electronic component part  60  may be separated from the upper storage compartment  21  by a heat insulating partition (not illustrated) and prevent heat generated by the various electronic components arranged inside the electronic component part  60  from penetrating into the upper storage compartment  21 . 
     The storage compartment  20  may be divided into the upper storage compartment  21  and the lower storage compartment  22  by a horizontal partition  23 . Although the refrigerator  1  according to the embodiment of the present disclosure may be a BMF type refrigerator in which the upper storage compartment  21  is a refrigerating compartment and the lower storage compartment  22  is a freezing compartment, embodiments are not limited thereto, and the refrigerator  1  may also be a TMF type refrigerator in which the upper storage compartment  21  is a freezing compartment and the lower storage compartment  22  is a refrigerating compartment. However, description will be given on the basis of the BMF type refrigerator for convenience of description. 
     Shelves  24  on which food can be placed, an airtight container  25  configured to hermetically store food, and a drawer  26  slid to be withdrawn from the upper storage compartment  21  or inserted into the upper storage compartment  21  may be provided in the upper storage compartment  21 . A drawer  27  slid to be withdrawn from the lower storage compartment  22  or inserted into the lower storage compartment  22  may be provided in the lower storage compartment  22 . 
     The storage compartment  20  may have the open front surface so that food can be put therein and taken out, and the open front surface may be opened or closed by the door  30 . 
     The upper storage compartment  21  may be opened or closed by an upper door  31  rotatably connected to the main body  10 . The lower storage compartment  22  may be opened or closed by a lower door  32  rotatably connected to the main body  10 . 
     Door shelves  35  on which food can be stored may be provided at a back surface of the upper door  31 . 
     The back surface of the upper door  31  may include a first shelf supporter  35   a  vertically extending to support at least one side of both left and right sides of the door shelves  35 . The first shelf supporter  35   a  may also be separably provided at the upper door  31  as a separate configuration, but is provided to extend from the back surface of the upper door  31  in the present embodiment. 
     Further, the back surface of the upper door  31  may include a second shelf supporter  35   b  vertically extending at an approximately central portion. Due to this configuration, the door shelves  35  may be arranged in parallel at the back surface of the upper door  31  or may be arranged to be horizontally asymmetrical with respect to the second shelf supporter  35   b . A camera  40  may be provided in the second shelf supporter  35   b  so that an inside of the upper storage compartment  21  can be captured. 
     The upper door  31  may include an upper handle  33  provided at a lower end portion thereof. A user may grip the upper handle  33  and easily open or close the upper door  31 . The upper handle  33  may extend in a horizontal direction of the upper door  31  and may be formed in a shape recessed toward an inside of the upper door  31 , but the shape of the upper handle  33  is not limited thereto, and the upper handle  33  may have any shape as long as the shape can be easily gripped by the user. 
     The lower door  32  may include a lower handle  34  provided at an upper end portion. The user may grip the lower handle  34  and easily open or close the lower door  32 . The lower handle  34  may extend in a horizontal direction of the lower door  32  and may be formed in a shape recessed toward an inside of the lower door  32 , but the shape of the lower handle  34  is not limited thereto, and the lower handle  34  may have any shape as long as the shape can be easily gripped by the user. 
     Gaskets  36  may be provided at edges of back surfaces of the upper door  31  and the lower door  32  to seal gaps between the doors and the main body  10  in a state in which the upper door  31  and the lower door  32  are closed. The gaskets  36  may be installed in the shape of a loop along the edges of the back surfaces of the upper door  31  and the lower door  32 , and magnets (not illustrated) may be included therein. 
     The refrigerator  1  according to the embodiment of the present disclosure may further include a display unit  50  having an input/output function. The display unit  50  may be installed at the upper door  31  for convenience of a user. A heat dissipation unit  100  for dissipating heat generated in the display unit  50  may be provided behind the display unit  50  (see  FIG. 3 ). The heat dissipation unit  100  will be described in detail below. 
     A speaker assembly (not illustrated) which outputs an operation of the refrigerator  1  due to the display unit  50  by voice may be provided at a front portion of the upper side of the main body  10 , and an upper portion of the speaker assembly may be covered by a cover member  71 . 
     A Universal Serial Bus (USB) connection unit  73  connected to the display unit  50  and to which a USB (not illustrated) capable of outputting an image on the display unit  50  is connected may be provided at an upper end of the upper door  31 . 
     Next, the heat dissipation unit will be described in detail with reference to  FIGS. 3 to 11 . 
       FIG. 3  is a cross-sectional view illustrating an upper door of the refrigerator according to the embodiment of the present disclosure,  FIG. 4  is a view illustrating a state in which an upper cover and a discharge duct are disassembled according to an embodiment of the present disclosure,  FIG. 5  is a view illustrating a state in which the discharge duct illustrated in  FIG. 4  is coupled to a heat dissipation cover,  FIG. 6  is a view illustrating a state in which the upper cover illustrated in  FIG. 5  is coupled to an upper door cap, and  FIG. 7  is a cross-sectional view illustrating a portion in which a heat dissipation duct is coupled to a coupling portion according to an embodiment of the present disclosure. 
     As illustrated in  FIGS. 3 to 7 , the heat dissipation unit  100  for dissipating the heat generated in the display unit  50  is arranged behind the display unit  50  inside the upper door  31 . 
     The heat dissipation unit  100  includes a heat dissipation cover  110  arranged behind the display unit  50  and a heat dissipation duct  120  coupled to an upper portion and a lower portion of the heat dissipation cover  110 . 
     The heat dissipation cover  110  is preferably provided to have a size corresponding to the display unit  50 , and a heat dissipation flow path  111  for dissipating the heat generated in the display unit  50  is formed inside the heat dissipation cover  110 . 
     Coupling portions  112  to which the heat dissipation duct  120  is coupled are provided at the upper portion and the lower portion of the heat dissipation cover  110 , and the coupling portions  112  include a first coupling portion  113  provided at the lower portion of the heat dissipation cover  110  and a second coupling portion  114  provided at the upper portion thereof. 
     A suction duct  140  of the heat dissipation duct  120  into which outside air is suctioned is coupled to the first coupling portion  113 , and a discharge duct  130  of the heat dissipation duct  120  through which air inside the heat dissipation flow path  111  is discharged to the outside is coupled to the second coupling portion  114 . 
     A detailed structure of the coupling portion  112  will be described with a description of the heat dissipation duct  120  below. 
     The heat dissipation duct  120  includes the discharge duct  130  coupled to the upper portion of the heat dissipation cover  110  and in which a discharge flow path  131  is formed, and the suction duct  140  coupled to the lower portion of the heat dissipation cover  110  and in which a suction flow path  141  is formed. 
     Although structures of the discharge duct  130  and the suction duct  140  are the same, the discharge duct  130  and the suction duct  140  are nominally distinguished because the discharge duct  130  and the suction duct  140  either suction or discharge air according to coupling positions thereof. 
     Although a plurality of discharge ducts  130  and a plurality of suction ducts  140  are provided and two discharge ducts  130  and two suction ducts  140  are illustrated in the drawings, embodiments are not limited thereto, and a single discharge duct  130  and a single suction duct  140  may be provided, or three or more discharge ducts  130  and three or more suction ducts  140  may be provided. 
     The heat dissipation duct  120  includes a rear surface portion  121  in a planar shape and a round portion  123  protruding from a front surface of the rear surface portion  121  in a direction toward a front surface of the upper door  31 . 
     The round portion  123  is provided at the front surface of the rear surface portion  121  to have a round cross-section to maximally secure a space, which can be filled with the heat insulating material  13 , between the front surface of the upper door  31  forming an exterior thereof and the heat dissipation duct  120  when the inside of the upper door  31  is filled with the heat insulating material  13 . 
     Because the heat insulating material  13  is hardened and contracted after being filled in the space, the above prevents a curve from being generated at the front surface of the upper door  31  forming the exterior due to the contraction of the heat insulating material  13  when the space filled with the heat insulating material  13  is narrow. 
     Although there is no problem in the case in which a thickness of the upper door  31  is thick because the space filled with the heat insulating material  13  can be sufficiently secured, because it is difficult to sufficiently secure the space filled with the heat insulating material  13  in the case in which the thickness of the upper door  31  is thin, the space filled with the heat insulating material  13  can be maximally secured only when the round portion  123  is formed in the heat dissipation duct  120 . 
     A reinforcing rib  125  configured to reinforce strength at a portion with a largest width among the flow paths  131  and  141 , which are formed inside the heat dissipation duct  120 , may be provided between the rear surface portion  121  and the round portion  123 . 
     The discharge duct  130  of the heat dissipation duct  120  is inserted into the upper door  31  through the upper portion of the upper door  31 , and is coupled to the upper portion of the heat dissipation cover  110 . 
     An upper door cap  80  is coupled to the upper portion of the upper door  31 , and the upper door cap  80  includes a second inserting portion  81  into which the discharge duct  130  is inserted. 
     A number of second inserting portions  81  corresponding to the number of discharge ducts  130  are provided, and the second inserting portion  81  includes a second insertion hole  83  into which the discharge duct  130  is inserted and a second guide  85  configured to guide the discharge duct  130  inserted into the second insertion hole  83  to slide in a vertical direction. 
     The second guide  85  may be provided to extend downward from the second insertion hole  83 . 
     A fixing hook  87  configured to fix the discharge duct  130  inserted into the second insertion hole  83  may be provided at one side of the second insertion hole  83 . 
     A lower end portion of the discharge duct  130  inserted through the second inserting portion  81  is coupled to the second coupling portion  114  provided at the upper portion of the heat dissipation cover  110 . 
     The second coupling portion  114  includes an insertion groove  115  into which the lower end portion of the discharge duct  130  is inserted, a first supporter  116  configured to support an outer portion of the discharge duct  130  inserted into the insertion groove  115 , and a second supporter  117  configured to support an inner portion of the discharge duct  130 . 
     The insertion groove  115  is provided to have a shape corresponding to the rear surface portion  121  and the round portion  123  of the discharge duct  130 . 
     The second supporter  117  configured to support the inner portion of the discharge duct  130  may include a coupling groove  118  to which the reinforcing rib  125  of the discharge duct  130  is fitted and coupled. 
     Because the second inserting portion  81  of the upper door cap  80  and the second coupling portion  114  of the heat dissipation cover  110  respectively accommodate the upper portion and the lower portion of the discharge duct  130  to block the upper portion and the lower portion from the space filled with the heat insulating material  13 , leakage of the heat insulating material  13  to the outside can be prevented without a separate sealing task. 
     An upper cover  150  configured to cover the second inserting portion  81  to block the second inserting portion  81  from the outside is coupled to the upper door cap  80 , and discharge holes  151  that allow the discharge flow path  131  of the discharge duct  130  to communicate with an outside of the upper door  31  are provided in the upper cover  150 . 
     Because the second inserting portion  81  is blocked from the outside by the upper cover  150 , penetration of foreign substances into the discharge duct  130  inserted into the second inserting portion  81  can be prevented. 
       FIG. 8  is a view illustrating a state in which a lower cover and a suction duct are disassembled according to an embodiment of the present disclosure,  FIG. 9  is a view illustrating a state in which the suction duct illustrated in  FIG. 8  is coupled to the heat dissipation cover,  FIG. 10  is a view illustrating a state in which the lower cover illustrated in  FIG. 9  is coupled to a lower door cap, and  FIG. 11  is a view illustrating a lower door cap and a cross-section of a first inserting portion provided at the lower door cap according to an embodiment of the present disclosure. 
     As illustrated in  FIGS. 8 to 11 , the suction duct  140  of the heat dissipation duct  120  is inserted into the upper door  31  through the lower portion of the upper door  31  and coupled to the lower portion of the heat dissipation cover  110 . 
     Because the structure of the suction duct  140  is the same as that of the discharge duct  130 , a description thereof will be omitted. 
     A lower door cap  90  is coupled to the lower portion of the upper door  31 , and the lower door cap  90  includes a first inserting portion  91  into which the suction duct  140  is inserted. 
     A number of first inserting portions  91  corresponding to the number of suction ducts  140  are provided, and the first inserting portion  91  includes a first insertion hole  93  into which the suction duct  140  is inserted and a first guide  95  configured to guide the suction duct  140  inserted into the first insertion hole  93  to slide in the vertical direction. 
     The first guide  95  may be provided to extend upward from the first insertion hole  93 . 
     An upper end portion of the suction duct  140  inserted through the first inserting portion  91  is coupled to the first coupling portion  113  provided at the lower portion of the heat dissipation cover  110 . 
     Because a structure of the first coupling portion  113  is the same as that of the second coupling portion  114 , a description thereof will be omitted. 
     Because the first inserting portion  91  of the lower door cap  90  and the first coupling portion  113  of the heat dissipation cover  110  respectively accommodate the lower portion and the upper portion of the suction duct  140  to block the lower portion and the upper portion from the space filled with the heat insulating material  13 , leakage of the heat insulating material  13  to the outside can be prevented without a separate sealing task. 
     The lower door cap  90  includes a recessed portion having an upwardly-recessed shape, and the first inserting portion  91  is provided at the recessed portion. 
     The recessed portion forms the upper handle  33  of the upper door  31 . 
     A lower cover  160  configured to cover the first inserting portion  91  to block the first inserting portion  91  from the outside is coupled to the lower door cap  90 , a light emitting diode (LED)  161  that is lit according to an opening and closing of the lower door  32  is mounted in the lower cover  160 , and suction holes  163  that allow the suction flow path  141  of the suction duct  140  to communicate with the outside of the upper door  31  are provided in the lower cover  160 . 
     Both side portions of the lower cover  160  are provided to have a round shape so that the recessed portion forming the upper handle  33  of the upper door  31  forms the largest possible space and a user can easily grip the upper handle  33 , and the suction holes  163  may be provided at both of the side portions of the lower cover  160 . 
     Because the first inserting portion  91  is blocked from the outside by the lower cover  160 , penetration of foreign substances into the suction duct  140  inserted into the first inserting portion  91  can be prevented. 
     The lower cover  160  may be formed of a transparent material so that light is emitted to an outside of the lower cover  160  when the LED  161  mounted in the lower cover  160  is lit according to the opening and closing of the lower door  32 . 
     Although it is illustrated in the drawings that the lower cover  160  is coupled and accommodated in the recessed portion forming the upper handle  33  of the upper door  31  and light emitted by the LED  161  is emitted downward from the upper door  31 , embodiments are not limited thereto, and the light emitted by the LED  161  may also be emitted forward from the upper door  31 . 
     Next, a process in which the heat dissipation duct is coupled to the heat dissipation cover will be described. 
     As illustrated in  FIG. 4 , when the discharge duct  130  is inserted through the second inserting portion  81  of the upper door cap  80  in a state in which the upper door cap  80  is coupled to the upper portion of the upper door  31 , the discharge duct  130  slides downward, and the lower end portion of the discharge duct  130  is coupled to the second coupling portion  114  of the heat dissipation cover  110 , as illustrated in  FIG. 5 . 
     Because the discharge duct  130  slides downward through the second inserting portion  81  to be coupled to the heat dissipation cover  110 , the discharge duct  130  can be easily coupled to the heat dissipation cover  110 . 
     When the discharge duct  130  is coupled to the second coupling portion  114  of the heat dissipation cover  110 , the upper cover  150  is coupled to the upper door cap  80 , as illustrated in  FIG. 6 . 
     As illustrated in  FIG. 8 , when the suction duct  140  is inserted through the first inserting portion  91  of the lower door cap  90  in a state in which the lower door cap  90  is coupled to the lower portion of the upper door  31 , the suction duct  140  slides upward, and the upper end portion of the suction duct  140  is coupled to the first coupling portion  113  of the heat dissipation cover  110 , as illustrated in  FIG. 9 . 
     Because the suction duct  140  slides upward through the first inserting portion  91  to be coupled to the heat dissipation cover  110 , the suction duct  140  can be easily coupled to the heat dissipation cover  110 . 
     When the suction duct  140  is coupled to the first coupling portion  113  of the heat dissipation cover  110 , the lower cover  160  is coupled to the lower door cap  90 , as illustrated in  FIG. 10 . 
     Looking at a process in which the heat generated in the display unit  50  is dissipated by the heat dissipation unit  100 , because air whose temperature is increased due to the display unit  50  flows upward in the heat dissipation flow path  111  formed inside the heat dissipation cover  110  as illustrated in  FIG. 3 , a lower portion of the heat dissipation flow path  111  should be supplemented with air. 
     Consequently, outside air is suctioned through the suction holes  163  provided in the lower cover  160 , and the air suctioned into the suction holes  163  is supplied to the lower portion of the heat dissipation flow path  111  through the suction flow path  141  (see  FIG. 9 ). 
     The air with an increased temperature that flows upward inside the heat dissipation flow path  111  is discharged to the outside of the heat dissipation flow path  111  through the discharge flow path  131  of the discharge duct  130 , and the air discharged through the discharge flow path  131  is discharged to the outside of the upper door  31  through the discharge holes  151  of the upper cover  150  (see  FIG. 6 ). 
     Because air outside the upper door  31  passes through the suction flow path  141  and is transmitted to the heat dissipation flow path  111  due to natural convection of air and the air whose temperature is increased due to the display unit  50  is discharged to the outside of the upper door  31  through the discharge flow path  131  due to the outside air being transmitted to the heat dissipation flow path  111 , the heat generated in the display unit  50  may be dissipated to the outside without being transmitted to the storage compartment  20 . 
     Although description has been given mainly on the basis of particular shapes and directions in the above description of the refrigerator with reference to the accompanying drawings, various modifications and changes may be made by one of ordinary skill in the art, and such modifications and changes should be construed as belonging to the scope of the present disclosure.