Patent Publication Number: US-2023139545-A1

Title: Cooking appliance

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims priority to and benefit of Korean Patent Application No. 10-2021-0146027, filed in Korea on Oct. 28, 2021, and 10-2022-0013986, filed in Korea on Feb. 3, 2022 which are hereby incorporated by reference as if fully set forth herein. 
     BACKGROUND 
     1 Field 
     A cooking appliance is disclosed herein. 
     2. Background 
     The content described in this section merely provides background information and does not constitute related art. 
     A cooking appliance is a home appliance that cooks food or other items (hereinafter, collectively “food”) using microwaves and/or heat from a heater, which are type(s) of electromagnetic waves. The cooking appliance may generally include a cavity, which is a space in which food is placed and cooked, and a door that opens and closes the cavity. 
     A related art cooking appliance is disclosed in Korean Patent Application Laid-Open No. 10-2008-0070408, which is hereby incorporated by reference. When the cooking appliance is installed indoors, it is necessary to consider efficient use of the cooking appliance and an installation space, for example. For this reason, the cooking appliance may be disposed at a location adjacent to a heating cooking device, for example, a heating-type oven, or a gas range, for example. More specifically, the cooking appliance may be disposed above the heating cooking device. 
     When the cooking appliance is disposed above the heating cooking device, a user may conveniently cook food by reducing his/her movement in an environment where the cooking appliance and the heating cooking device are adjacent to each other. In addition, heat and oil mist, for example, generated from the heating cooking device may be discharged to the outside using the cooking appliance as a hood. 
     In a state in which the cooking appliance is disposed above the heating cooking device, the heat and oil mist, for example, generated from the heating cooking device disposed below the cooking appliance may adversely affect an operation of the cooking appliance. For example, a display unit may be mounted on a front surface of a door provided in the cooking appliance in order to provide various types of information to the user. The user may know a cooking state of the cooked food through the display unit. 
     In addition, when the display unit is connected to another home appliance and serves as a hub of the home appliance, information other than cooking information of food may be obtained through the display unit. In addition, the user may input a command required for cooking and other various commands into the display unit through a touch method. 
     In the state in which the cooking appliance is disposed above the heating cooking device, the heat and oil mist, for example, generated from the heating cooking device may penetrate into the display unit and other components mounted on the door. It is necessary to prevent the display unit and other components mounted on the door of the cooking appliance from being damaged or malfunctioning due to such heat and oil mist, for example. 
     In addition, the door may be provided with an air guide in which a flow path of air flowing therein is formed in order to form an air curtain on the door and cool components inside of the door. At this time, when air leaks from a gap at an edge of the air guide, it may cause the air flowing inside of the door to interfere with the forming of the air curtain or cooling the inside of the door. Accordingly, there is a need for structure for preventing the air from leaking through the gap at the edge of the air guide. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements, and wherein: 
         FIG.  1    is a perspective view of a cooking appliance according to an embodiment; 
         FIG.  2    is a view showing a state in which a door of the cooking appliance of  FIG.  1    has been opened; 
         FIG.  3 A  is a perspective view of the door of the cooking appliance of  FIG.  1   ; 
         FIG.  3 B  is a view of the door of  FIG.  3 A  from another direction; 
         FIG.  4 A  is a rear view of the door of  FIG.  3 A ; 
         FIG.  4 B  is an exploded perspective view of a portion of the door according to an embodiment; 
         FIG.  4 C  is a view of the door of  FIG.  4 B  from another direction; 
         FIG.  5    is an exploded perspective view of the door according to an embodiment; 
         FIG.  6    is a view of the door of  FIG.  5    from another direction; 
         FIG.  7    is a side cross-sectional view of the door according to an embodiment; 
         FIG.  8    is a perspective view of an outer panel according to an embodiment; 
         FIG.  9 A  is a rear view of the outer panel of  FIG.  8   ; 
         FIG.  9 B  is a view of the outer panel of  FIG.  8    from another direction; 
         FIG.  10    is an exploded perspective view of a display unit and the outer panel according to an embodiment; 
         FIG.  11    is a view of an inner panel and an air guide according to an embodiment; 
         FIG.  12    is an exploded perspective view of the inner panel and air guide of  FIG.  11   ; 
         FIG.  13    is a view of the inner panel and air guide of  FIG.  12    from another direction; 
         FIG.  14    is an enlarged view of portion A of  FIG.  12   ; 
         FIG.  15    is an enlarged view of portion B of  FIG.  11   ; 
         FIG.  16    is an enlarged view of portion C of  FIG.  11   ; 
         FIG.  17    is a cross-sectional view partially cut in a state in which the air guide, the blower, and the inner panel are coupled; 
         FIG.  18    is an enlarged view of portion D of  FIG.  17   ; and 
         FIG.  19    is an enlarged view of portion E of  FIG.  17   . 
     
    
    
     DETAILED DESCRIPTION 
     Objects, features, and advantages will be described hereinafter with reference to the accompanying drawings, and accordingly, those skilled in the art to which embodiments pertain will be able to easily practice the technical spirit. In describing embodiments, when it is determined that description of a known technique related to the may unnecessarily obscure the gist, unnecessary description will be omitted. Hereinafter, embodiments will be described with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components. 
     Although the first and second, for example, are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from other components, and unless otherwise stated, it goes without saying that the first component may also be the second component. 
     Throughout, unless specifically stated otherwise, each component may be singular or plural. 
     As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or various steps described in the specification, and should be construed that some components or some steps may not be included, or additional components or steps may be further included. 
     Throughout, when “A and/or B” is used, it means A, B or A and B, unless specifically stated otherwise, and when “C to D” is used, it means greater than or equal to C and smaller than or equal to D unless specifically stated otherwise. 
     Throughout, “upward-downward direction” means the upward-downward direction of the cooking appliance in a state in which the cooking appliance is installed for daily use. “Leftward-rightward direction” means a direction perpendicular to the upward-downward direction, and the frontward-rearward direction means a direction perpendicular to both the upward-downward direction and the leftward-rightward direction. “Bilateral direction” or “lateral direction” has the same meaning as the leftward-rightward direction, and these terms may be used interchangeably in the present specification. 
       FIG.  1    is a perspective view of a cooking appliance according to an embodiment.  FIG.  2    is a view showing a state in which a door of the cooking appliance of  FIG.  1    has been opened. 
     The cooking appliance according to an embodiment may be disposed at a location spaced apart from a heating cooking device in an upward-downward direction above a location where the heating cooking device, for example, a heating-type oven or a gas range, for example, is disposed. The placement of the cooking appliance may allow a user to conveniently use cooking devices including the cooking appliance. In addition, the cooking appliance may serve as a hood of the heating cooking device disposed thereunder. In this case, the cooking appliance may be provided with components for use as a hood. 
     The cooking appliance may cook food using microwaves, and/or heat from a heater, which are type(s) of electromagnetic waves. The cooking appliance may include a main body  10  in which a cavity  11  is formed, and a door  20  that opens and closes the cavity  11 . 
     Food to be cooked may be placed in the cavity  11 . The door  20  may be disposed in front of the cavity  11  and rotatably mounted on the main body  10  to open and close the cavity  11 . 
     A vent hole  13  through which air suctioned in by a suction unit provided on a lower portion of the main body  10  is discharged to the outside may be provided in an upper portion of the main body  10 . The suction unit may be provided at a lower portion of the main body  10  of the cooking appliance. Accordingly, the cooking appliance may serve as a hood for suctioning the air discharged from the heating cooking device disposed thereunder to discharge the air to the outside. 
     The main body  10  may further include a front panel  12  provided on an edge of an entrance of the cavity  11 , and having one surface disposed to face one surface of a choke member or choke  170  when the door  20  is closed to close the cavity  11 . 
     The front panel  12  may be provided to surround the edge of the entrance of the cavity  11  and protrude with a predetermined width. Accordingly, when the door  20  is closed, an edge portion of the door  20  and the cavity  11  may overlap each other. 
     This structure may allow the front panel  12  to seal the cavity  11  in a state in which the door  20  is closed, thereby preventing oil, moisture, and oil mist, for example. generated in the process of cooking food placed in the cavity  11  from being discharged to the outside through an inlet of the cavity  11 . 
       FIG.  3 A  is a perspective view of the door of the cooking appliance of  FIG.  1    according to an embodiment.  FIG.  3 B  is a view of the door of  FIG.  3 A  from another direction.  FIG.  4 A  is a rear view of the door of  FIG.  3 A .  FIG.  4 B  is an exploded perspective view showing a portion of the door according to an embodiment.  FIG.  4 C  is a view of the door of  FIG.  4 B  from another direction. 
     The door  20  may include a display module  21 , a cooling flow path unit  22 , and a shielding unit  23 . The display module  21  may be disposed in front of the door  20 , and the user may see an inside of the cavity  11  of the cooking appliance through the display module  21 . 
     The cooling flow path unit  22  may be disposed behind the display module  21 , and a flow path through which air for cooling may flow may be formed therein. The air flowing into the door  20  may flow into the door  20  through the cooling flow path unit  22  to cool the door  20 . 
     The shielding unit  23  may be disposed behind the cooling flow path unit  22 , and may shield electromagnetic waves generated from the main body  10 . The shielding unit  23  may protect the user by blocking the electromagnetic waves generated in the cavity  11  and propagating to the outside of the cooking appliance. For example, the shielding unit  23  may serve to block the electromagnetic waves (microwaves) generated to cook food in the main body  10  from being discharged to the outside of the door  20 . 
     The cooling flow path unit  22  may be provided to cool electronic components mounted inside of the door  20 , including a display unit  110  mounted on the display module  21 . The air for cooling the door  20  may flow inside of the cooling flow path unit  22 . The display unit  110  may be formed in a thin shape and provided so that an area of the display unit  110  occupies most of one surface of the door  20 . 
     Accordingly, the display unit  110  may occupy most of the area of a front portion of the door  20 , and a placement area of the display unit  110  may be increased, thereby improving user visibility. The user may conveniently check various types of information through the display unit  110  provided with a large screen. 
     As a size of the display unit  110  is increased, an amount of heat generated may increase. Accordingly, the display unit  110  in the door  20  needs to be effectively cooled. In this embodiment, the cooling flow path unit  22 , through which cooling air flows, may be separately provided. 
     The cooling flow path unit  22  may be disposed behind the display unit  110 , and thus, the display unit  110  may be effectively cooled by the air flowing through the cooling flow path unit  22 . In addition, a heat-generating component mounted on the display module  21  may be cooled by the air flowing through the cooling flow path unit  22 . In other words, the cooling flow path unit  22  may cool the display module  21  provided with the display unit  110  and other various heat-generating components. In order to effectively cool the display unit  110 , the entire display unit  110  may be exposed to the air flowing through the cooling flow path unit  22 . In addition, the airflow discharged to the outside of the door  20  through the cooling flow path unit  22  may form an air curtain to block heat and oil mist rising from the heating cooking device disposed below the cooking appliance. 
     The air flowing through the cooling flow path unit  22  may be branched inside of the cooling flow path unit  22  to be discharged to a top and bottom of the display module  21 . The cooling air may be branched inside of the cooling flow path unit  22  and discharged to the top and bottom of the display module  21 , so that the cooling air may flow while in contact with an entire rear surface of the display unit  110  to effectively cool the display unit  110 . 
     In addition, the cooling air may be discharged to each of the top and bottom of the display module  21  to effectively form the air curtain around the display unit  110  and the door  20 , so that the heat and oil mist rising from the heating cooking device disposed below the cooking appliance may be effectively blocked by the air curtain. 
     The display module  21  may be provided with the display unit  110 , a camera, and other electronic components, and the cooling flow path unit  22  may be provided with electronic components, such as a blowing device or blower  150  operated by a motor. Accordingly, the shielding unit  23  configured to shield the electromagnetic waves generated from the main body may be provided behind the cooling flow path unit  22  in order to protect the user and the electronic components from electromagnetic waves. 
     The display unit  110  and various electronic components may be disposed in the display module  21 , the cooling flow path unit  22  in which the flow path of the air for cooling the display module  21  is formed may be disposed behind the display module  21 , and the shielding unit  23  configured to shield electromagnetic waves from reaching the electronic components provided in the display module  21  may be disposed behind the cooling flow path unit  22 . 
     In this embodiment, the display module  21  configured to provide various types of information and convenience to the user may be disposed on a front surface of the cooking appliance, that is, at a front of the door  20 . In addition, in this embodiment, there is a need for structure that effectively cools the components, such as the display unit  110  provided in the display module  21 , effectively cools an inside of the door  20  provided with the display unit  110 , for example, and at a same time, forms the flow path of the cooling air for forming the air curtain around the door  20 , and also protects the electronic components mounted on the door  20  from electromagnetic waves. In order to satisfy this need, the display module  21  may be disposed at the front of the door  20 , the cooling flow path unit  22  may be disposed behind the display module  21 , and the shielding unit  23  may be disposed behind the cooling flow path unit  22 . 
     In other words, in order to implement the door structure according to the above-described embodiment, the display module  21 , the cooling flow path unit  22 , and the shielding unit  23  that play their own roles may be sequentially disposed on the door  20  from the front to a rear in the door  20 . In addition, the display module  21 , the cooling flow path unit  22 , and the shielding unit  23  may be stably coupled to each other to prevent the cooling air from flowing outside of the door  20  through other portions other than a first outlet  123  disposed at an upper portion of the display module  21  and a second outlet  124  at a lower portion of the display module  21 . Hereinafter, the door  20  implemented using the above-described structure will be described. 
     The display module  21  may include the first outlet  123  and the second outlet  124 . The first outlet  123  may be disposed at the upper portion of the display module  21 , and the air flowing inside of the display module  21  may be discharged to the outside through the first outlet  123 . 
     The second outlet  124  may be disposed at the lower portion of the display module  21 , and the air flowing inside of the display module  21  may be discharged to the outside through the second outlet  124 . In other words, the air flowing inside of the door  20  may be discharged to the outside through the first outlet  123  and the second outlet  124 , respectively, disposed at the upper and lower portions of the door  20 , so that the air may flow through the entire inside of the door  20  to effectively cool the entire door  20 . 
     The display module  21  may include the display unit  110  and an outer panel  120 . The display unit  110  may be disposed on a front surface of the door  20  to display videos or images. 
     The display unit  110  may display information necessary for cooking to provide the information to the user. In addition, the display unit  110  may receive a user&#39;s command in a touch recognition method. 
     The display unit  110  may be connected to communicate with other home appliances, and cameras and locks, for example, provided in a front door. In addition, the display unit  110  may be connected to communicate with an external device required by the user. 
     The user may receive information necessary for operations of home appliances, visits by outsiders, and other aspects of daily life from the display unit  110 , and transmit commands to home appliances and other devices connected to the display unit  110  using the display unit  110 . Accordingly, the door  20  including the display unit  110  may serve as a kind of Internet of Things hub that transmits information about home appliances and other devices necessary for daily life to the user, and transmits the user&#39;s commands to these devices. 
     The outer panel  120  may be disposed behind the display unit  110 , and the display unit  110  may be mounted thereon. The outer panel  120  may have a hollow  1201  and may be provided in a shape having a predetermined width in the frontward-rearward direction of the door  20 . 
     The hollow  1201  of the outer panel  120  may be closed by a rear surface of the display unit  110 . Air flowing inside of the outer panel  120  may collide with the rear surface of the display unit  110  exposed to the hollow  1201  of the outer panel  120 . Accordingly, the air flowing inside of the outer panel  120  may come into contact with the rear surface of the display unit  110  to cool the display unit  110 . In addition, the air passing through a blowing fan or fan  152  may be exposed to the hollow  1201  of the outer panel  120  to cool heat-generating components, such as a speaker  260 , a microphone  270 , a communication unit  280 , and a control board  290 . 
     As the outer panel  120  has the above-described structure, the outer panel  120  may have an interior space, and various components may be built in in the interior space. A width in the frontward-rearward direction of the door  20  may be substantially determined by the outer panel  120 . 
     A first aperture  121  into which air may flow may be formed in an upper end of the outer panel  120 . A plurality of the first aperture  121  may be provided. Each of the plurality of first apertures  121  may be provided so that a plurality of slit-shaped holes is arranged at intervals. This structure may somewhat prevent foreign substances from flowing into the door  20  through the first aperture  121 . 
     A handle  122  may be provided on one side of the outer panel  120  to be used when the user opens and closes the door  20 . The handle  122  may be formed, for example, by recessing a side portion of the outer panel  120 . 
     A button device  300  may be mounted on one side of the outer panel  120 , for example, just below a location where the handle  122  is formed. The user may supply electricity to the cooking appliance or cut off the electricity supply by manipulating the button device  300 . Specific manipulation for operation of the cooking appliance is possible by inputting commands into the display unit  110 . 
     The outer panel  120  may support various components, such as the display unit  110 , the speaker  260 , the microphone  270 , the communication unit  280 , and the control board  290 , and may be formed with the first aperture  121  into which external air flows, and the first outlet  123  and the second outlet  124  through which air is discharged. 
     The door  20  may be provided with a camera. Images captured by the camera may be reproduced on the display unit  110 , and the user may view images inside of the cavity  11  or of the lower portion of the cooking appliance through the display unit  110 . The camera may include a first camera  210 , a second camera  220 , and a third camera  230 . 
     The first camera  210  may be mounted on a lower portion of the outer panel  120  to capture a state of the lower portion of the door  20 . As the first camera  210  is mounted on the lower portion of the outer panel  120  so that a gaze direction faces the lower portion of the cooking appliance, the first camera  210  may capture a heating cooking device disposed below the cooking appliance. 
     The user may observe a state of the heating cooking device and a state of food being cooked on the heating cooking device by the image captured by the first camera  210  and reproduced on the display unit  110 . 
     The second camera  220  may be disposed on the upper portion of the door  20  and may capture the front of the door  20 . The second camera  220  may capture the front of the cooking appliance. 
     The second camera  220  may pass through a baffle  190  and a front cover  200 , which will be described hereinafter. The user may observe a situation in front of the cooking appliance captured and recorded by the second camera  220 . 
     The second camera  220  may capture the user in front of the cooking appliance. Accordingly, the second camera  220  may be used for the user to make a video call with other people in a remote location outside of the front door using the display unit  110 . 
     The third camera  230  may be mounted on a frame  160  described hereinafter, may be disposed to face the cavity  11 , and may capture an image of the cavity  11 . In other words, the third camera  230  may face the cavity  11  to capture a situation within the cavity  11 . The user may observe a situation in which food is cooked in the cavity  11  through the image captured by the third camera  230 . 
     The door  20  may include a human detection unit or human detector  240  disposed on the upper portion of the door  20 , mounted by passing through the baffle  190  and the front cover  200 , disposed at a location spaced apart from the second camera  220 , and configured to detect a presence of the user in front of the cooking appliance. The human detector  240  may detect whether there is a person in front of the door  20  by, for example, infrared recognition or gesture recognition. A control unit provided in the cooking appliance may identify whether there is a user in front of the cooking appliance through the human detector  240 . 
     When there is a user, for example, the control unit may operate the display unit  110  to activate functions of the cooking appliance necessary for the user&#39;s convenience and safety by taking an action to enable the user to use the display unit  110  immediately. 
       FIG.  5    is an exploded perspective view of the door according to an embodiment.  FIG.  6    is a view of the door of  FIG.  5    from another direction. 
     The cooling flow path unit  22  may include an inner panel  130 , an air guide  140 , and the blower  150 . The inner panel  130  may be disposed behind the outer panel  120  and mounted on the outer panel  120 . Also, The inner panel  130  may be disposed behind the air guide  140 . The air guide  140  described hereinafter may be mounted on the inner panel  130 . The inner panel  130  along with the air guide  140  may form a space in which the air suctioned into the door  20  flows. The inner panel  130  may be mounted with the air guide  140  and coupled to the frame  160  to provide the space in which the air flowing into the door  20  flows. 
     The air guide  140  may be configured to guide the flow of the air introduced into the door  20 . The air guide  140  may be disposed between the outer panel  120  and the inner panel  130 , and coupled to the inner panel  130 . The air guide  140  may guide the flow of air flowing into the door  20  from the outside, and form the space in which the air may flow. 
     The blower  150  may be mounted on the air guide  140 . The blower  150  may forcibly blow the air flowing into the air guide  140  from a rear to a front of the air guide  140 . 
     The shielding unit  23  may include the frame  160  and the choke  170 . The frame  160  may be disposed behind the inner panel  130 , may be coupled to the inner panel  130 , and may have one side rotatably coupled to the main body  10 . As the frame  160  rotates, the door  20  may be rotated to open and close the cavity  11  of the cooking appliance. 
     The frame  160  may be coupled to the inner panel  130  to form a flow path of air for cooling, and at the same time, may form an inner surface of the door  20  with a shielding structure that prevents leakage of electromagnetic waves, that is, the choke  170 . 
     The choke  170  may be disposed behind the frame  160 , may be coupled to the frame  160 , and may block electromagnetic waves generated in the main body  10  from being discharged to the outside. The choke  170  may be generally provided in a quadrangular shape having a hollow, for example, and may surround an edge portion of the frame  160 . 
     The display module  21  may include the baffle  190  and the front cover  200 . The baffle  190  may be disposed in front of the display unit  110 , may surround an edge of the display unit  110 , and may be coupled to the outer panel  120  to mount the display unit  110  on the outer panel  120 . 
     The baffle  190  may be generally formed in, for example, a quadrangular shape having a hollow to surround the edge of the display unit  110 , and thus, may serve as a bezel of the display unit  110 . The front cover  200  may be disposed in front of the baffle  190 , and surround an edge of the baffle  190 . The front cover  200  may be generally formed in a quadrangular shape having a hollow, for example, and may serve to stably couple the display unit  110  and the baffle  190  to the outer panel  120 . 
       FIG.  7    is a side cross-sectional view of the door according to an embodiment.  FIG.  8    is a perspective view of the outer panel according to an embodiment.  FIG.  9 A  is a rear view of the outer panel according to an embodiment.  FIG.  9 B  is a view of the outer panel of  FIG.  8    from another direction.  FIG.  10    is an exploded perspective view of the display unit and the outer panel according to an embodiment.  FIG.  11    is a view showing the inner panel and the air guide according to an embodiment. 
     Referring to  FIG.  10   , the outer panel  120  may include the speaker  260 , the microphone  270 , and the communication unit  280 . At least one speaker  260  may be mounted on a side of the outer panel  120 . The speaker  260  may generate a voice, or an alarm sound, for example, necessary for operating the cooking appliance. In addition, the speaker  260  may generate all voices or alarm sounds, for example, for the door  20  including the display unit  110  of the door  20  to serve as an Internet of Things hub. 
     The microphone  270  may be mounted at a top of the outer panel  120  and may receive the user&#39;s voice. The user may input voice commands to operate the cooking appliance through the microphone  270 . In addition, the microphone  270  may be a component of the door  20  serving as an Internet of Things hub. 
     The communication unit  280  may be mounted on the outer panel  120  at a location spaced apart from the speaker  260  and the microphone  270 . As the door  20  serves as an Internet of Things hub, the communication unit  280  provided in the door  20  may be appropriately provided to perform various types of wired or wireless communication functions. 
     Accordingly, a plurality of the communication unit  280  may be provided Each communication unit  280  may be provided as a device corresponding to a different communication method. 
     For example, the communication unit  280  may be provided as a wireless communication device. Each communication unit  280  may be provided as any one of a ZigBee communication device, a Wi-Fi communication device, a jet wave communication device, and a Bluetooth communication device, for example. However, the communication method of the communication unit  280  is not limited thereto, and the communication unit  280  may also be provided as a wired communication device. 
     The control board  290  that controls the cooking appliance may be mounted on the outer panel  120 . A control unit configured to control the cooking appliance may be implemented on the control board  290 . 
     The outer panel  120  may be provided with a holder  120   a , an opening hole  120   b , a first through hole  120   c , a second through hole  120   d , a mounting guide  120   e , and a fitting projection  120   f . The holder  120   a  may be provided to support the speaker  260 . The holder  120   a  may protrude from an inner wall of the outer panel  120 , a portion of which may have an arc shape to correspond to a circular shape of the speaker  260 . 
     The speaker  260  may be mounted on the holder  120   a  and provided on the outer panel  120 . As a pair of speakers  260  is provided, a pair of holders  120   a  may also be provided and formed at a location corresponding to each of the pair of speakers  260 . 
     The opening hole  120   b  may pass through a bottom of the outer panel  120 . The first camera  210  may be disposed at a location adjacent to the opening hole  120   b  to be able to view the lower side of the outer panel  120  through the opening hole  120   b.    
     The first through hole  120   c  may be formed in a side of the outer panel  120 . The first through hole  120   c  may be provided adjacent to a location at which the speaker  260  is disposed. The first through hole  120   c  may allow the speaker  260  to communicate with the outside, and at the same time, may be formed in a mesh shape in order to prevent the speaker  260  from being exposed to the outside. 
     The speaker  260  may communicate with the outside of the outer panel  120  through the first through hole  120   c  to effectively transmit an alarm and other voices to the user. As a pair of speakers  260  is provided, a pair of first through holes  120   c  may also be provided and formed at a location corresponding to each of the pair of speakers  260 . 
     The second through hole  120   d  may be formed in a lower portion of one side of the outer panel  120  to pass through the outer panel  120 . A portion of the button device  300  mounted inside of the outer panel  120  through the second through hole  120   d  may be exposed to the outside of the outer panel  120 . The user may manipulate the button device  300  by contacting the exposed portion of the outer panel  120 . 
     The mounting guide  120   e  may be formed on an inner wall of the outer panel  120  to support the plurality of communication units  280 . Accordingly, the mounting guide  120   e  may be provided in a same number as the plurality of communication units  280 . The mounting guide  120   e  may guide the communication unit  280  to be mounted on the outer panel  120 . 
     For example, the mounting guide  120   e  may be provided so that a projection having a shape corresponding to an edge of the communication unit  280  is formed on the inner wall of the outer panel  120 . Each of the plurality of mounting guides  120   e  may be provided to have a shape and size corresponding to a shape and size of each of the plurality of communication units  280 . 
     The fitting projection  120   f  may protrude from the inner wall of the outer panel  120 . A plurality of fitting projections  120   f  may be provided and spaced apart from each other. The control board  290  may be fitted into the fitting projections  120   f . For example, the fitting projection  120   f  may be disposed at a location adjacent to an edge of the plate-shaped control board  290 . 
     Accordingly, the control board  290  may have corners fitted into the fitting projections  120   f  and may be mounted on the outer panel  120 . A shape fitting structure corresponding to the shape of the control board  290  may be formed on the fitting projection  120   f  so that the corner of the control board  290  may be fitted thereto. 
     As shown in  FIG.  8   , the first outlet  123  may be disposed on the upper portion of the outer panel  120 , and the second outlet  124  may be disposed on the lower portion of the outer panel  120 . The first outlet  123  may be disposed on the upper portion of the outer panel  120 , and the air blown by the blower  150  may be discharged to the outside. The second outlet  124  may be disposed on the lower portion of the outer panel  120 , and the air blown by the blower  150  may be discharged to the outside. 
     Referring to  FIG.  3 B , when the door  20  is assembled, the first outlet  123  and the second outlet  124  may be partially blocked by the baffle  190  and the front cover  200 . At this time, holes for discharging air may be formed at locations corresponding to the first outlet  123  and the second outlet  124  in the baffle  190 . 
     The first outlet  123  may be provided at a location adjacent to an upper end of the display unit  110 , and the second outlet  124  may be provided at a location adjacent to a lower end of the display unit  110 . Accordingly, the air forcibly blown inside the door  20  by the blower  150  may be discharged to the outside at locations adjacent to upper and lower ends of the display unit  110  through the first outlet  123  and the second outlet  124 . 
     The air discharged through the first outlet  123  may form the air curtain on the upper portion of the door  20 . In addition, the air discharged through the second outlet  124  may form the air curtain on the lower portion of the door  20 . 
     The term “air curtain” refers to means for blocking permeation of an external airflow into the door  20 . In this embodiment, a boundary surface or a boundary zone in which the flow of air discharged from the inside of the door  20  through the first outlet  123  and the second outlet  124  forms a boundary against the flow of the external air may be referred to as an “air curtain”. 
     The air curtain formed by the air discharged from the inside of the door  20  through the first outlet  123  and the second outlet  124  may prevent permeation of external air into the door  20 . As the heating cooking device is disposed below the cooking appliance, heat generated when the heating cooking device is used and oil mist generated from food being cooked may rise and permeate into the cooking appliance. 
     The heat transmitted from the heating cooking device to the cooking appliance may damage components of the door  20  provided in the cooking appliance. In particular, components in which the display unit  110  and circuits and elements, for example, related to its operation are embedded may be vulnerable to heat. 
     In addition, the oil mist transmitted from the food being cooked may be attached to the door  20  provided in the cooking appliance. The oil mist may be attached to the surface of the display unit  110  to lower image quality of the display unit  110 , and attached to the surfaces of other components mounted on the door  20  to damage these components. 
     In this embodiment, the airflow discharged to the outside of the door  20  through the first outlet  123  and the second outlet  124  provided in the door  20  forms the air curtain, so that the heat and oil mist rising from the heating cooking device disposed below the cooking appliance may be effectively blocked by the air curtain. Accordingly, it is possible to effectively prevent various electronic components including the display unit  110  provided in the door  20  from being damaged or degraded by the heat and the oil mist. 
     Referring to  FIG.  11   , the air guide  140  may include an inlet  141  and a mounting hole  142 . The inlet  141  may be disposed on an upper portion of the air guide  140 , external air may be introduced through the inlet  141 , and at least one inlet  141  may be provided. 
     The inlet  141  may be disposed at a location corresponding to the first aperture  121  provided on the upper portion of the outer panel  120 . Accordingly, the external air may pass through the first aperture  121  of the outer panel  120  to flow into the door  20  through the inlet  141 . 
     The mounting hole  142  may be formed in a lower portion of the inlet  141  in the air guide  140 , and the blower  150  may be mounted therein. The mounting hole  142  may pass through the air guide  140  in the frontward-rearward direction of the door  20 . Accordingly, air may flow from the upper portion to the lower portion of the air guide  140  through the inlet  141 , and its direction may be changed, so that the air may flow from the rear to the front of the air guide  140  through the mounting hole  142 . 
     The blower  150  may include a casing  151  and the blowing fan  152 . The casing  151  may be disposed in the mounting hole  142  and formed with a hollow, and the blowing fan  152  may be mounted in the hollow. 
     The blowing fan  152  may be rotatably mounted in the casing  151 , and may blow air from the rear to the front of the air guide  140 . The blowing fan  152  may receive electricity and rotate to blow air inside of the door  20 . 
     By rotation of the blowing fan  152 , external air may flow into the door  20  through the inlet  141 , and may be discharged to the outside of the door  20  through the first outlet  123  and the second outlet  124 . The mounting hole  142  of the air guide  140  may be formed in a middle of the casing  151  and correspond to a location, area, and shape of the hollow in which the blowing fan  152  is disposed. 
     Hereinafter, the airflow inside of the door  20  will be described with reference to  FIG.  7   . In  FIG.  7   , the airflow is indicated by arrows. 
     As the blowing fan  152  rotates, external air may flow into the door  20  through the inlet  141  of the air guide  140 , and flow to be discharged to the outside of the door  20  through the first outlet  123  and the second outlet  124 . 
     The air forcibly flowing by the blower  150  may be introduced from the inlet  141  formed at an upper position of the door  20  to flow in a downward direction of the door  20  to be introduced into the blower  150 . And then, the air may pass through the blower  150  in a front-rear direction of the door  20 , and may be branched in front of the air guide  140  in an up-down direction. And then, a part of the air may flow in an upward direction of the door  20  to be discharged to a first outlet  123  formed at an upper position of the door  20 , and the other part of the air may flow in the downward direction of the door  20  to be discharged to a second outlet  124  formed at an lower position of the door  20 . 
     The air forcibly blown by the blowing fan  152  may specifically have the following flow path. The air may flow into the door  20  from the first aperture  121  of the outer panel  120  and the inlet  141  provided at a location corresponding thereto. The air flowing into the door  20  may flow downward from the door  20  to flow into the blowing fan  152 . 
     The air may pass through the blowing fan  152  in the frontward-rearward direction of the door  20 . At this time, the air may pass through the mounting hole  142  of the air guide  140  while passing through the blowing fan  152 . A flow direction of the air in the blowing fan  152  may be changed from the upward-downward direction of the door  20  to the frontward-rearward direction thereof. 
     As a front of the mounting hole  142  is blocked by the display unit  110 , the air passing through the mounting hole  142  may be branched in the upward-downward direction in front of the air guide  140 . A first portion of the branched air may flow upward from the door  20  and may be discharged through the first outlet  123 . A second portion of the branched air may flow downward from the door  20  and may be discharged through the second outlet  124 . 
     The air branched from the first outlet  123  and the second outlet  124  may surround the entire door  20 . In particular, the branched air may surround a front surface of the door  20 . This structure may allow the air discharged from the first outlet  123  and the second outlet  124  to form the air curtain on the door  20 , thereby effectively preventing heat and oil mist generated from the heating cooking device disposed below the cooking appliance from permeating into the door  20 . 
     At least a portion of the air discharged from the first outlet  123  may come into contact with the front surface of the display unit  110  while moving downward by gravity to cool the display unit  110 . In addition, the above-described airflow structure inside of the door  20  may allow the air flowing into the door  20  to flow through the entire inside of the door  20 . For example, the air may flow in the entire space formed by the rear surface of the display unit  110  and the outer panel  120 . 
     Accordingly, the air flowing inside of the door  20  may cool the entire rear surface of the display unit  110 , and effectively cool the outer panel  120  and other components mounted on other portions of the door  20 . In particular, the outer panel  120  may be provided with components that generate heat, such as the speaker  260 , the microphone  270 , the communication unit  280 , and the control board  290 . These heat-generating components may be disposed over the entire outer panel  120 . Accordingly, the air may flow through the entire inside of the outer panel  120 , thereby effectively cooling these heat-generating components. 
     As shown in  FIG.  7   , the first aperture  121  and the inlet  141  into which air flows may communicate with each other. As the blowing fan  152  rotates, the external air may flow into the air guide  140  through the first aperture  121  and the inlet  141  to flow toward the blower  150  through the space formed by the inner panel  130  and the air guide  140 . 
     The air may flow toward the blowing fan  152  of the blower  150  in the space formed by the frame  160 . The air may pass through the blowing fan  152  and collide with the rear surface of the display unit  110  disposed to face the blowing fan  152  to cool the display unit  110 . 
     After the air passing through the blowing fan  152  collides with the rear surface of the display unit  110 , the flow may be branched in the upward and downward direction of the display unit  110 . The air directed to the upper side of the display unit  110  may be discharged to the outside of the door  20  through the first outlet  123  provided on the upper portion of the outer panel  120 . The air flowing downward from the display unit  110  may be discharged to the outside of the door  20  through the second outlet  124  provided on the lower portion of the outer panel  120 . 
     In this embodiment, the air flowing inside of the door  20  may cool the entire front surface of the display unit  110  while being discharged through the first outlet  123 . In addition, the air flowing inside of the door  20  may effectively cool the heat-generating components mounted on the rear surface of the display unit  110  and inside of the door  20 . 
       FIG.  12    is an exploded perspective view of the inner panel and air guide of  FIG.  11   .  FIG.  13    is a view of the inner panel and air guide of  FIG.  12    from another direction. 
     Referring to  FIG.  13   , the mounting hole  142  may be formed in the middle of the air guide  140 . The casing  151  has a hollow having a location, size, and shape corresponding to the mounting hole  142 , and the blowing fan  152  may be disposed in the hollow. The casing  151  may be disposed at a location corresponding to the hollow and the mounting hole  142  of the air guide  140  and mounted on one surface of the air guide  140 . 
     A hollow  130   a  may be formed in the inner panel  130 . As the hollow  130   a  of the inner panel  130  is blocked by the frame  160 , the air introduced through the inlet  141  may not leak into the hollow  130   a  of the inner panel  130 . Accordingly, the inner panel  130  and the frame  160  together may form a flow path through which the air cooling the inside of the door  20  may flow. 
     As shown in  FIG.  12   , the inner panel  130  may include a blocking protrusion  131  that protrudes from a portion corresponding to the edge of the air guide  140  toward the air guide  140 , and engaged with the air guide  140  to block the air from leaking through a gap between the air guide and the inner panel  130 . The blocking protrusion  131  may generally be formed on a portion of the inner panel  130  corresponding to the edge of the air guide  140 . The blocking protrusion  131  may prevent air from leaking to the outside of the air guide through the gap between the inner panel  130  and the air guide  140  at the edge portion of the air guide  140  when the inner panel  130  and the air guide  140  are coupled. 
     The blocking protrusion  131  may include a first blocking portion  131   a  and a second blocking portion  131   b . The first blocking portion  131   a  and the second blocking portion  131   b  may protrude from one surface of the inner panel  130  toward the air guide  140 . 
     The first blocking portion  131   a  may be formed on a lower portion of the inner panel  130 , and may extend in a lateral direction of the inner panel  130 . A pair of second blocking portions  131   b  may be connected to both ends of the first blocking portion  131 , respectively, and may extend in an upward-downward direction of the inner panel  130 . 
     The air guide  140  may include an engagement groove portion or groove  143  having a structure capable of being engaged with the blocking protrusion  131 . The engagement groove  143  may be provided on the edge of the air guide  140  in a shape corresponding to the blocking protrusion  131 , and engaged with the blocking protrusion  131  to block air from leaking through the gap between the air guide and the inner panel  130 . 
     As the engagement groove  143  of the air guide  140  and the blocking protrusion  131  of the inner panel  130  correspond, the engagement groove  143  may be coupled to the blocking protrusion  131 . Accordingly, the gap at the edge of the air guide  140  may be blocked by the engagement groove  143  and the blocking protrusion  131 , thereby effectively preventing air forcibly blown into the door  20  from leaking at a coupling portion of the edge of the air guide  140  and the inner panel  130 . 
     Accordingly, the air forcibly blown into the door  20  may be prevented from leaking to the outside of the door  20  and flow along the designed flow path. Due to this structure, it is possible to improve a cooling effect and air curtain forming effect of the door  20 . 
     The engagement groove  143  may include a first engagement portion or groove  143   a  and a second engagement portion or groove  143   b . The first engagement groove  143   a  may be disposed at a location corresponding to the first blocking portion  131   a , and may extend in a lateral direction of the air guide  140 . 
     The second engagement groove  143   b  may be disposed at a location corresponding to the second blocking portion  131   b , may be provided as a pair, and may extend in an upward-downward direction of the air guide  140 . The first blocking portion  131   a  and the first engagement groove  143   a  may be coupled and engaged with each other, and the second blocking portion  131   b  and the second engagement groove  143   b  may be coupled and engaged with each other, thereby preventing air from leaking at the edge of the air guide  140 . 
     The air guide  140  may include an upper portion  140   a  in which the inlet  141  is formed and a lower portion  140   b  in which the blower  150  is disposed. When the air guide  140  and the inner panel  130  are coupled, the lower portion  140   b  may be generally disposed at a location corresponding to the hollow  130   a  of the inner panel  130 . 
     When looking down at the air guide  140  from the upper portion of the door  20 , a cross-sectional area of the upper portion  140   a  of the air guide  140  may be greater than a cross-sectional area of the lower portion  140   b . As the cross-sectional area of the upper portion  140   a  is expanded, the cross-sectional area of the inlet  141  may also be expanded. Accordingly, in the air guide  140 , as the inlet  141  through which air is introduced is expanded, external air may be easily introduced into the air guide  140 . When looking down at the air guide  140  from the upper portion of the door  20 , The cross-sectional area of the upper portion  140   a  may be at least partially increased in the direction toward the inlet  141 . Accordingly, the cross-sectional area of the inlet  141  may be more sufficiently expanded in order that external air may be easily introduced into the air guide  140 . 
     The lower portion  140   b  of the air guide  140  may have a smaller cross-sectional area than that of the upper portion  140   a , but as the lower portion  140   b  of the air guide  140  corresponds to the hollow  130   a  of the inner panel  130 , the airflow space in the portion corresponding to the lower portion  140   b  may be expanded toward the frame  160  by the hollow  130   a  of the inner panel  130 . As a result, the lower portion  140   b  of the air guide  140  may also have a shape in which the airflow space is expanded by the hollow  130   a  of the inner panel  130 . In other words, the lower portion  140   b  of the air guide  140  corresponding to the hollow  130   a  of the inner panel  130  is formed to have a smaller cross-sectional area than that of the upper portion  140   a  of the air guide  140 , but the flow space of the lower portion  140   b  of the air guide  140  may be expanded to the frame  160  by the hollow  130   a  of the inner panel  130 . 
     Accordingly, the upper portion  140   a  and the lower portion  140   b  of the air guide  140  may have an expanded cross-sectional area due to the above-described structure. Accordingly, the airflow space formed by coupling the air guide  140  and the inner panel  130  may be sufficiently wide, and the air may be smoothly introduced from the outside and may also smoothly pass through the blower  150  mounted on the lower portion  140   b  of the inner panel  130 . 
     In addition, due to the decrease in cross-sectional area of the lower portion  140   b  of the air guide  140 , conversely, the space in which the air passing through the blower  150  is discharged from the lower portion  140   b  of the air guide  140  may be expanded. The air passing through the blower  150  may pass through the hollow  1201  of the outer panel  120  and come into contact with the display unit  110  to cool the display unit  110 . 
     The above-described structure may allow the door  20  to have a slim overall structure and increase a flow rate of air flowing therein, thereby improving a cooling efficiency of the door  20 . 
       FIG.  14    is an enlarged view of portion A of  FIG.  12   .  FIG.  15    is an enlarged view of portion B of  FIG.  11   .  FIG.  16    is an enlarged view of portion C of  FIG.  11   . 
     The blocking protrusion  131  may include a hook  1311  that protrudes from the second blocking portion  131   b . The engagement groove  143  may include a fitting hole  1434  formed in the second engagement groove  143   b , provided at a location corresponding to the hook  1311 , and having the hook  1311  fitted therein. 
     The blocking protrusion  131  may be formed with the hook  1311 , and the engagement groove  143  may be formed with the fitting hole  1434  at the location corresponding to the hook  1311 . Accordingly, the air guide  140  and the inner panel  130  may be stably coupled by fitting the fitting hole  1434  onto the hook  1311 . Due to this structure, it is possible to improve a work efficiency during assembly of the door  20  by not using a separate coupling mechanism, such as a bolt, or reducing a number of coupling mechanisms used and at the same time, stably coupling the air guide  140  and the inner panel  130 . 
     A pair of hooks  1311  and a pair of fitting holes  1434  may be provided. The pair of hooks  1311  and the pair of fitting holes  1434  may be formed at locations corresponding to each other. Accordingly, the pair of hooks  1311  may be formed on both sides of the pair of second blocking portions  131   b , respectively, and the pair of fitting holes  1434  may be formed on both sides of the pair of second engagement portions  143   b , respectively. 
     The second engagement groove  143   b  may include an elastically deformable portion  143   b - 1  formed on the edge of the air guide  140  so that at least a portion thereof is separated from a remaining portion of the second engagement groove  143   b , formed with the fitting hole  1434 , and provided so that at least a portion thereof is elastically deformed when the hook  1311  is fitted into the fitting hole  1434 . 
     It is necessary to easily fit the hook  1311  into the portion where the fitting hole  1434  is formed. Accordingly, the fitting hole  1434  may be formed with the elastically deformable portion  143   b - 1  having the above-described structure. The elastically deformable portion  143   b - 1  may be formed with the fitting hole  1434 . 
     The elastically deformable portion  143   b - 1  may be separated from the remaining portion of the second engagement groove  143   b , and thus, easily elastically deformed. Accordingly, when the fitting hole  1434  is fitted onto the hook  1311  or conversely, the hook  1311  is removed from the fitting hole  1434 , the elastically deformable portion  143   b - 1  may be elastically deformed, so that a task of fitting the hook  1311  into the fitting hole  1434  may be easily performed when the door  20  is assembled. 
     A plurality of hooks  1311  and a plurality of fitting holes  1434  may be provided, and each of the hooks  1311  and each of the fitting holes  1434  may be provided at locations corresponding to each other. At this time, the hooks  1311  and the fitting holes  1434  may be provided in the same numbers. 
     For example, the plurality of hooks  1311  may be provided, and each of the hooks  1311  may be spaced apart from each other in a longitudinal direction of the second blocking portion  131   b . Correspondingly, the plurality of fitting holes  1434  may be provided, and each of the fitting holes  1434  may be spaced apart from each other in a longitudinal direction of the second engagement groove  143   b  and disposed at locations corresponding to each of the hooks  1311 . 
       FIG.  17    is a cross-sectional view partially cut in a state in which the air guide, the blower, and the inner panel are coupled.  FIG.  18    is an enlarged view of portion D of  FIG.  17   .  FIG.  19    is an enlarged view of portion E of  FIG.  17   . 
     The engagement groove  143  may include a first bent portion  1431 , a second bent portion  1432 , and a third bent portion  1433  in order to be formed in a groove shape to be stably coupled to the blocking protrusion  131 , and at the same time, block leakage of air. The first bent portion  1431  may be bent from an end of the inner panel  130 . The second bent portion  1432  may be bent from the first bent portion  1431 , and provided so that at least a portion thereof is in contact with a tip of the blocking protrusion  131 . The third bent portion  1433  may be bent from the second bent portion  1432 . The first bent portion  1431 , the second bent portion  1432 , and the third bent portion  1433  may be integrally formed, and formed in a groove shape. 
     When the engagement groove  143  is mounted on the blocking protrusion  131 , the first bent portion  1431  and the third bent portion  1433  may double-block the gap formed between the inner panel  130  and the air guide  140 . Accordingly, it is possible to effectively prevent air flowing through the space formed by coupling the inner panel  130  and the air guide  140  from leaking through this gap. 
     Embodiments disclosed herein provide a cooking appliance having a display unit provided on a front surface in order to provide various types of information to the user. Further, embodiments disclosed herein provide a cooking appliance having a display unit provided on a door of the cooking appliance using microwaves. Furthermore, embodiments disclosed herein provide a cooking appliance having structure capable of preventing heat and oil mist, for example, generated from a heating cooking device disposed thereunder from penetrating into a door. 
     Embodiments disclosed herein provide a cooking appliance having structure capable of preventing a display unit from being contaminated by oil mist. Embodiments disclosed herein provide a cooking appliance having a cooling structure of a display module attached to a front surface of a door. 
     Embodiments disclosed herein provide a cooking appliance having structure capable of preventing heat and oil mist, for example, from penetrating into a door by forming an air curtain outside of the door. Also, embodiments disclosed herein provide a cooking appliance having a door equipped with a display unit on a front surface thereof and formed with a cooling structure for cooling the display unit and a microwave shielding structure for preventing microwave leakage. In addition, embodiments disclosed herein provide a cooking appliance having structure that prevents air from leaking through a gap at an edge of an air guide. 
     Advantages are not limited to the above-described advantages, and other advantages not mentioned may be understood by the following description, and will be more clearly understood by embodiments. In addition, it will be easily seen that the advantages may be realized by a means described in the claims and combinations thereof. 
     A cooking appliance according to embodiments disclosed herein may include a main body formed with a cavity, and a door that opens and closes the cavity. The door may include a display module disposed in front of the door, a cooling flow path unit disposed behind the display module, and having a flow path formed therein through which air for cooling flows, and a shielding unit disposed behind the cooling flow path unit, and configured to shield electromagnetic waves generated from the main body. 
     The air flowing through the cooling flow path unit may be branched from an inside of the cooling flow path unit to be discharged to a top and bottom of the display module. As the blowing fan rotates, external air may flow into the door through an inlet of an air guide, and flow to be discharged to the outside through a first outlet and a second outlet. The air forcibly blown by the blowing fan may specifically have the following flow path. 
     The air may flow into the door from a first aperture of an outer panel and an inlet provided at a location corresponding thereto. The air flowing into the door may flow in a downward direction of the door to flow into the blowing fan. 
     The air may pass through the blowing fan in the frontward-rearward direction of the door. At this time, the air may pass through a mounting hole of the air guide while passing through the blowing fan. A flow direction of the air may be changed from the upward-downward direction into the frontward-rearward direction of the door at the blowing fan. As a front of the mounting hole is closed by the display unit, the air passing through the mounting hole may be branched in front of the air guide in the upward-downward direction. 
     A part or first portion of the branched air may flow in an upward direction of the door to be discharged through the first outlet. The other part or a second portion of the branched air may flow in the downward direction of the door to be discharged to the second outlet. 
     The air branched at the first outlet and the second outlet may surround the entire door. In particular, the branched air may surround a front portion of the door. This structure may allow the air discharged through the first outlet and the second outlet to form an air curtain on the door, thereby effectively preventing heat and oil mist generated from a heating cooking device disposed below the cooking appliance from permeating into the door. 
     A cooking appliance according to embodiments disclosed herein may include a main body formed with a cavity, and a door that opens and closes the cavity. The door may include a display unit configured to display videos or images, an outer panel disposed behind the display unit and on which the display unit is mounted, an inner panel disposed behind the outer panel, and mounted on the outer panel, an air guide disposed between the outer panel and the inner panel, and coupled to the inner panel, and a blowing device or blower mounted on the air guide. 
     The inner panel may include a blocking protrusion that protrudes from a portion corresponding to an edge of the air guide toward the air guide, and engaged with the air guide to block air from leaking through a gap between the air guide and the inner panel. The blocking protrusion may include a first blocking portion formed on a lower portion of the inner panel, and having a longitudinal direction disposed in both side directions of the inner panel, and a pair of second blocking portions provided to be connected to ends of both sides of the first blocking portion, respectively, and having a longitudinal direction disposed in an upward-downward direction of the inner panel. 
     The air guide may include an engagement groove portion or groove provided on an edge in a shape corresponding to the blocking protrusion, and engaged with the blocking protrusion to block air from leaking through a gap between the air guide and the inner panel. The engagement groove portion may include a first engagement portion or groove disposed at a location corresponding to the first blocking portion, and having a longitudinal direction disposed in both side directions of the air guide, and a second engagement portion or groove disposed at a location corresponding to the second blocking portion, provided as a pair, and having a longitudinal direction disposed in an upward-downward direction of the air guide. 
     The engagement groove portion may include a first bent portion bent from an end of the inner panel, a second bent portion bent from the first bent portion, and provided so that at least a portion thereof is in contact with a tip of the blocking protrusion, and a third bent portion bent from the second bent portion. The blocking protrusion may include a hook formed to protrude from the second blocking portion. The engagement groove portion may include a fitting hole formed in the second engagement portion, provided at a location corresponding to the hook, and having the hook fitted therein. Hooks may be formed on both sides of the pair of second blocking portions, respectively, and the fitting holes may be formed in both sides of the pair of second engagement portions, respectively. 
     The second engagement portion may include an elastically deformable portion formed on the edge of the air guide so that at least a part or portion thereof is separated from a remaining portion of the second engagement portion, formed with the fitting hole, and provided so that at least a part or portion thereof is elastically deformed when the hook is fitted into the fitting hole. 
     A plurality of hooks may be provided, and each of the hooks may be disposed to be spaced apart from each other in a longitudinal direction of the second blocking portion. A plurality of fitting holes may be provided, and each of the fitting holes may be spaced apart from each other in a longitudinal direction of the second engagement portion and disposed at a location corresponding to each of the hooks. 
     The outer panel may include a first outlet disposed on an upper portion, and having the air blown by the blowing device discharged to the outside therethrough, and a second outlet disposed on a lower portion, and having the air blown by the blowing device discharged to the outside therethrough. The air guide may include at least one inlet disposed on an upper portion, and having external air introduced therein, and a mounting hole formed on a lower portion of the inlet, and mounted with the blowing device. 
     The blowing device may include a casing disposed in the mounting hole, and a blowing fan rotatably mounted in the casing, and blowing air from a rear to a front of the air guide. 
     The air forcibly blown by the blowing fan may be introduced from the inlet to flow in a downward direction of the door to flow into the blowing fan, may pass through the blowing fan in a frontward-rearward direction of the door, and may be branched in front of the air guide in an up-down direction, a part or first portion of which may flow in an upward direction of the door to be discharged to the first outlet, and the other part or a second portion of which may flow in a downward direction of the door to be discharged to the second outlet. 
     The door may further include a baffle disposed in front of the display unit, surrounding an edge of the display unit, and coupled to the outer panel to mount the display unit on the outer panel, a front cover disposed in front of the baffle, and provided to surround an edge of the baffle, and a frame disposed behind the inner panel, coupled to the inner panel, and having one side rotatably coupled to the main body. The door may further include a first camera mounted on a lower portion of the outer panel to capture a state of a lower portion of the door, a second camera disposed on an upper portion of the door, mounted by passing through the baffle and the front cover, and configured to capture a state of a front of the door, and a third camera mounted on the frame, disposed to face the cavity, and configured to capture a state of the cavity. 
     The door may further include a human detection unit or detector disposed on the upper portion of the door, mounted by passing through the baffle and the front cover, disposed at a location spaced apart from the second camera, and configured to detect a presence of a user in front of the cooking appliance. 
     In the cooking appliance according to embodiments disclosed herein provide, as the display module is provided on the front of the door, the user may know a cooking situation in the cooking appliance through the display module. The display module may serve as a hub of another home appliance to provide various types of information to the user, thereby enhancing user convenience. 
     Further, in the cooking appliance according to embodiments disclosed herein, the airflow discharged to the outside of the door through the first outlet and the second outlet may form an air curtain, so that heat and oil mist rising from a heating cooking device disposed below the cooking appliance may be effectively blocked by the air curtain. Accordingly, it is possible to effectively prevent various electronic components including the display unit provided on the door from being damaged or degraded by the heat and oil mist. In addition, it is possible to prevent the display unit from being contaminated by the heat and oil mist and thus giving inconvenience to the user. 
     Furthermore, in the cooking appliance according to embodiments disclosed herein provide, the air flowing inside of the door may be discharged through the first outlet to cool the entire front surface of the display unit. In addition, the air flowing inside of the door may effectively cool heat-generating components mounted on a rear surface of the display unit and inside of the door. 
     In addition, in the cooking appliance according to embodiments disclosed herein, a door having all of the display structure, the cooling structure, and the shielding structure of the electromagnetic waves may be formed. The display structure, the cooling structure, and the shielding structure may be coupled to one another to slimly form the door as a whole. Accordingly, it is possible to prevent a thickness of the door from being increased even when all of the display structure, the cooling structure, and the shielding structure are formed on the door. 
     Also, in the cooking appliance according to embodiments disclosed herein, a gap at the edge of the air guide may be blocked by the engagement groove portion and the blocking protrusion, thereby effectively preventing air forcibly blown into the door from leaking at a coupling portion between the edge of the air guide and the inner panel. Accordingly, the air forcibly blown into the door may be prevented from leaking to the outside of the door to flow along the designed flow path. Due to this structure, it is possible to improve the cooling effect and air curtain forming effect of the door by the forcibly flowing air. 
     Moreover, the cooking appliance according to embodiments disclosed herein, the hook may be formed on the blocking protrusion, and the engagement groove portion may be formed with the fitting hole at the location corresponding to the hook. Accordingly, the air guide and the inner panel may be stably coupled by fitting the fitting hole onto the hook. Due to this structure, it is possible to improve a work efficiency during assembly of the door by not using a separate coupling mechanism, such as a bolt, or reducing the number of coupling mechanisms used and at the same time, stably coupling the air guide and the inner panel. 
     In addition, in the cooking appliance according to embodiments disclosed herein, when the engagement groove portion is mounted on the blocking protrusion, the first bent portion and the third bent portion may double-block the gap that may be formed between the inner panel and the air guide. Accordingly, air flowing through the space formed by coupling the inner panel and the air guide may be effectively prevented from leaking through the gap. 
     Embodiments have been described with reference to the exemplary drawings, but it is apparent that the embodiments are not limited by the embodiments and drawings disclosed in this specification, and various modifications may be possible by those skilled in the art without departing from the technical spirit. In addition, although operations and effects according to embodiments have not been explicitly disclosed and described while describing the embodiments, it is natural that the effects predictable by the corresponding configuration should also be recognized. 
     It will be understood that when an element or layer is referred to as being “on” another element or layer, the element or layer can be directly on another element or layer or intervening elements or layers. In contrast, when an element is referred to as being “directly on” another element or layer, there are no intervening elements or layers present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that, although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section could be termed a second element, component, region, layer or section without departing from the teachings of the present invention. 
     Spatially relative terms, such as “lower”, “upper” and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “lower” relative to other elements or features would then be oriented “upper” relative to the other elements or features. Thus, the exemplary term “lower” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Embodiments are described herein with reference to cross-section illustrations that are schematic illustrations of idealized embodiments (and intermediate structures). As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. 
     Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.