Patent Publication Number: US-11391468-B2

Title: Cooking device

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a Divisional of U.S. patent application Ser. No. 15/061,607, filed on Mar. 4, 2016, now allowed, which claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 to Korean Patent Application No. 10-2015-0031572, filed on Mar. 6, 2015, all of which are hereby incorporated by reference in their entirety. 
     BACKGROUND 
     1. Field 
     A cooking device is disclosed herein. 
     2. Background 
     A cooking device is a device for cooking food using heat of a heating source. As an example of the cooking device, an oven range includes an oven chamber in which the food is cooked, and a burner which cooks the food in the oven chamber by burning a gas. 
     In Korean Patent Publication No. 10-2010-0013997 (published on Feb. 10, 2010) as a prior art document, there is disclosed an oven range. 
     In the oven range, a burner chamber is provided under a bottom surface thereof which forms an oven chamber, and a lower burner which convectively heats food in the oven chamber is installed in the burner chamber. 
     The oven range in the prior art document has the following problems. 
     First, as described above, to provide air heated by the lower burner from the burner chamber into the oven chamber, the oven chamber and the burner chamber are in communication with each other. However, since the burner chamber is provided under the oven chamber, a part of the bottom surface of the oven chamber should be open. 
     When a part of the bottom surface of the oven chamber is open, food leftovers or the like may be introduced into the burner chamber through an open portion of the oven chamber in communication with the burner chamber when the food is cooked in the oven chamber or the food is put into or taken out of the oven chamber. Therefore, a product may be contaminated by the food leftovers or the like. 
     Also, since a part of the bottom surface of the oven chamber is open, it is not easy to clean the oven chamber due to an opening of the bottom surface. 
     Also, since the lower burner is installed under the oven chamber, a cavity capacity is reduced by a burner installation space. 
     Also, in the case in which the lower burner is installed at an outer side of the oven chamber, when it is necessary to replace or check an ignition unit for igniting a mixed gas supplied to the lower burner, an outer case which surrounds the oven chamber should be separated therefrom, and thus an operation therefor is complicated, and much time is spent. 
     SUMMARY 
     The present invention is directed to a cooking device. 
     A cooking device comprises a frame including a plurality of supporting parts to support a tray on which food is put, the plurality of supporting parts being vertically separated from each other; a partitioning plate configured to divide an inner space of the frame into a cooking chamber and an air flow chamber in the frame; a burner disposed in the air flow chamber; and a fan disposed in the air flow chamber, wherein the partitioning plate includes an air inlet configured to introduce air inside the cooking chamber into the air flow chamber, and a plurality of air outlets configured to discharge air heated by the burner disposed in the air flow chamber to the cooking chamber, and the plurality of air outlets include a first air outlet and a second air outlet located at a lower level than the first air outlet, wherein at least a part of the second air outlet is located at a lower level than the tray while the tray is supported by a lowermost supporting part of the plurality of supporting parts. 
     A cooking device includes a frame configured to accommodate food; a partitioning plate configured to divide an inner space of the frame into a cooking chamber and an air flow chamber in the frame; a burner disposed in the air flow chamber; and a fan disposed in the air flow chamber, wherein the partitioning plate includes an air inlet configured to introduce air inside the cooking chamber into the air flow chamber, and a plurality of air outlets configured to discharge air heated by the burner disposed in the air flow chamber to the cooking chamber, wherein the plurality of air outlets include a first air outlet and a second air outlet located at a lower level than the first air outlet, wherein a width of the second air outlet is greater than a width of the first air outlet, and a length of the second air outlet is smaller than a length of the first air outlet. 
    
    
     
       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 device according to a first embodiment of the present invention; 
         FIG. 2  is a front view when a door is removed from the cooking device according to the first embodiment of the present invention; 
         FIG. 3  is a view when a burner assembly is removed from the cooking device shown in  FIG. 2 ; 
         FIG. 4  is an exploded perspective view of the burner assembly according to the first embodiment of the present invention; 
         FIG. 5  is a perspective view of a partitioning plate according to the first embodiment; 
         FIG. 6  is a view illustrating a flow of air in the cooking device according to the first embodiment; 
         FIG. 7  is a view illustrating a flow of air while a plurality of trays are located in a cooking chamber according to the first embodiment; 
         FIG. 8  is a perspective view of a partitioning plate according to a second embodiment; 
         FIG. 9  is a view illustrating a flow of air in a cooking device according to the second embodiment; 
         FIG. 10  is a perspective view of a partitioning plate according to a third embodiment; 
         FIG. 11  is a perspective view of a partitioning plate according to a fourth embodiment; and 
         FIG. 12  is an enlarged view of portion A shown in  FIG. 11 . 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. 
     Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings. Regarding the reference numerals assigned to the elements in the drawings, it should be noted that the same elements may be designated by the same reference numerals, wherever possible, even though they are shown in different drawings. Also, in the description of embodiments, detailed description of well-known related structures or functions may be omitted when it is deemed that such description may cause ambiguous interpretation of the present disclosure. 
     Also, in the description of embodiments, terms such as first, second, A, B, (a), (b) or the like may be used herein when describing components of the present invention. Each of these terminologies is not used to define an essence, order or sequence of a corresponding component but used merely to distinguish the corresponding component from other component(s). It should be noted that if it is described in the specification that one component is “connected,” “coupled” or “joined” to another component, the former may be directly “connected,” “coupled,” and “joined” to the latter or “connected,” “coupled,” and “joined” to the latter via another component. 
       FIG. 1  is a perspective view of a cooking device according to a first embodiment of the present invention, and  FIG. 2  is a front view when a door is removed from the cooking device according to the first embodiment of the present invention. 
     Referring to  FIGS. 1 and 2 , a cooking device  1  according to the first embodiment of the present invention may include an oven unit  20 . 
     The cooking device  1  may further include a cook-top unit  60 . The cooking device  1  may further include a drawer unit  40 . The cooking device  1  may further include a control unit  50 . 
     The cooking device  1  may further include an outer case  11 . The outer case  11  may cover both side surfaces and rear surfaces of the oven unit  20  and the drawer unit  40 . 
     However, the cook-top unit  60  and the drawer unit  40  may be omitted according to a type of the cooking device  1 . 
     The cook-top unit  60 , the oven unit  20 , and the drawer unit  40  may be disposed at an upper portion, a center portion, and a lower portion of the cooking device  1 , respectively. Further, the control unit  50  is disposed at a rear portion of an upper surface of the cooking device  1 . 
     The cook-top unit  60  may include a plurality of cook-top burners  61 . The cook-top burners  61  may heat a container in which food is put or may directly heat the food using a flame generated by burning a gas, and thus may cook the food. An operational unit  62  which operates the plurality of cook-top burners  61  may be disposed at a front end of the cook-top unit  60 . Alternatively, the operational unit  62  may be disposed at an upper surface of the cook-top unit  60 . 
     As another example, the cook-top unit  60  may include one or more electric heaters. However, the one or more electric heaters may not be exposed to the outside of the cook-top unit  60 . Therefore, in the embodiment, a type of a heating source forming the cook-top unit  60  is not limited. 
     The oven unit  20  may include a frame  21  forming a cooking chamber  22  in which the cooking of food is performed. 
     For example, the frame  21  may be formed in a rectangular parallelepiped shape of which a front surface is open, but is not limited thereto. 
     The oven unit  20  may further include a burner assembly  23  for cooking the food accommodated in the cooking chamber  22 . The oven unit  20  may further include an upper burner  24 . 
     The burner assembly  23  and the upper burner  24  may simultaneously heat the food, or any one of the burner assembly  23  and the upper burner  24  may heat the food. 
     The upper burner  24  provides heat to the food from above the food in the frame  21 , and the burner assembly  23  may be disposed at the rear of the food in the frame  21 . 
     For example, the upper burner  24  may be installed at an upper wall of the frame  21 , and the burner assembly  23  may be installed at a rear wall of the frame  21 . 
     The oven unit  20  may further include a door  25  which opens and closes the cooking chamber  22 . The door  25  may be rotatably connected to the cooking device  1 . For example, the door  25  opens and closes the cooking chamber  22  in a pull-down method in which an upper end is vertically rotated about a lower end. In the embodiment, an operating method of the door  25  is not limited. 
     A door handle  26  gripped by a user′ hand to rotate the door  25  may be provided at an upper end of a front surface of the door  25 . 
     The drawer unit  40  serves to keep the container, in which the food is put, at a predetermined temperature. A drawer  41  in which the container is accommodated may be provided at the drawer unit  40 . The drawer  41  may be inserted into or withdrawn from the cooking device  1  in a sliding method. A handle  42  gripped by the user may be provided at a front surface of the drawer  41 . 
     The control unit  50  may receive an operation signal for operating the cooking device  1 , specifically, an operation signal for operating at least one of the cook-top unit  60 , the oven unit  20  and the drawer unit  40 . Further, the control unit  50  may display a variety of information on the operation of the cooking device  1  to the outside. 
       FIG. 3  is a view when the burner assembly is removed from the cooking device shown in  FIG. 2 , and  FIG. 4  is an exploded perspective view of the burner assembly according to the first embodiment of the present invention. 
     Referring to  FIGS. 2 to 4 , the frame  21  may include two sidewalls  31 , a bottom wall  32 , an upper wall  33 , and a rear wall  35 . 
     In the embodiment, the term “front” is a direction toward a front surface of the cooking device  1 , and the term “rear” is a direction toward a rear surface of the cooking device  1 . 
     Further, in the cooking chamber  22 , the term “front” is a direction toward the door  25  of the oven unit  20 , and the term “rear” is a direction toward the rear wall  35  of the frame  21 . 
     The burner assembly  23  may be coupled to the rear wall  35  of the frame  21 . That is, in the embodiment, since the burner assembly  23  is not located under the frame  21  but is installed at the rear wall  35  of the frame  21 , a recessed portion  32   a  recessed downward may be formed at the bottom wall  32  of the frame  21 , and thus a capacity of the frame  21  may be increased. 
     Although the above-described burner assembly  23  is installed at the rear wall  35  of the frame  21 , alternatively, the burner assembly  23  may also be installed at any one of both of the sidewalls  31  of the frame  21 . 
     The burner assembly  23  may include a burner device  100 . The burner device  100  may include a burner  110  which generates a flame by burning a gas, and a burner cover  130  which covers the burner  110 . 
     The burner assembly  23  may further include a partitioning plate  190  which covers the burner device  100  and divides an inner space of the frame  21  into a plurality of spaces. 
     The burner assembly  23  may further include a fan  210  and a fan motor  212 . 
     The burner assembly  23  may further include a nozzle holder  220  for injecting the gas to the burner  110 . 
     The nozzle holder  220  may be located between the rear wall  35  of the frame  21  and the outer case  11 , and may be fixed to, for example, the rear wall  35  of the frame  21 . As another example, when an insulating material is displaced on the outer side of the frame  21 , the nozzle holder  220  may be displaced on the insulating material. 
     The nozzle holder  220  may be arranged with the burner  110  passing through the rear wall  35  of the frame  21  and may inject the gas to the burner  110 . 
     In the embodiment, the term “located in a frame” refers to the term “located in a space in which the frame is formed.” 
     A burner hole  36  through which the burner  110  passes may be formed in the rear wall  35  of the frame  21 . That is, the burner  110  may be located in the frame  21  and a part thereof may pass through the burner hole  36  to be located between the rear wall  35  of the frame  21  and the outer case  11 . 
     An exhaust hole  34  through which an exhaust gas is discharged may be formed in the upper wall  33  of the frame  21 . Alternatively, the exhaust hole  34  may not be formed in the upper wall  33 , but may also be formed in the rear wall  35  or one of both of the sidewalls  31  of the frame  21 . 
     The burner cover  130  may include a first cover  140  and a second cover  160 . For example, at least a part of the first cover  140  may cover the front of the burner  110 , and at least a part of the second cover  160  may cover the rear of the burner  110 . 
     The burner  110  may be formed in a “U” shape, but is not limited thereto. One end of the burner  110  may be connected to the nozzle holder  220 . The other end of the burner  110  may be blocked. 
     The burner  110  may include a plurality of gas discharge holes  114  for discharging the gas (i.e., a mixed gas in which air and a gas are mixed.). 
     The first cover  140  may include a first opening  142  through which air passes, and the second cover  160  may include a second opening  162  through which the air passes. 
     The burner device  100  may further include an ignition unit  230  for igniting the mixed gas supplied to the burner  110 . 
     The burner device  100  may further include a stabilizer  180  for stabilizing the flame generated from the burner  110 . 
     For example, the ignition unit  230  may be installed on the burner  110  in the frame  21 . When the ignition unit  230  is installed on the burner  110 , at least a part of the ignition unit  230  may be located in the burner cover  130 . 
     The fan motor  212  may be located between the rear wall  35  of the frame  21  and the outer case  11 , and the fan  210  may be located in the frame  21 . Therefore, a shaft  213  of the fan motor  212  may pass through the rear wall  35  of the frame  21  and may be coupled to the fan  210 . The fan motor  212  may be fixed to the rear wall  35  of the frame  21  or the outer case  11  by a motor mount which is not shown. 
     The partitioning plate  190  may protect the burner device  100 . Further, the partitioning plate  190  may block the movement of food leftovers or the like to the burner device  100  during a process of cooking food. 
       FIG. 5  is a perspective view of a partitioning plate according to the first embodiment,  FIG. 6  is a view illustrating a flow of air in the cooking device according to the first embodiment, and  FIG. 7  is a view illustrating a flow of air while a plurality of trays are located in a cooking chamber according to the first embodiment. 
     Referring to  FIGS. 4 to 7 , the partitioning plate  190  according to the embodiment may divide an inner space of the frame  21  into the cooking chamber  22  and an air flow chamber  22   a.    
     That is, the rear wall  35  of the frame  21  and the partitioning plate  190  may form the air flow chamber  22   a.    
     Further, the burner device  100  and the fan  210  may be located in the air flow chamber  22   a . Further, the burner cover  130  may form a combustion chamber C, and the burner  110  may be located in the combustion chamber C. 
     The fan  210  may be located between the burner cover  130  and the rear wall  351  of the frame  21 . 
     A plurality of supporting parts  37  may be provided at one or more walls of both of the sidewalls  31  of the frame  21  for supporting trays  38  and  39  on which food is put. The plurality of supporting parts  37  are vertically separated from each other and arranged, and may protrude from one or more walls of both of the sidewalls  31  of the frame  21  to the cooking chamber  22 , or may be recessed to accommodate the trays  38  and  39 . 
     As the plurality of supporting parts  37  are provided at the frame  21 , the plurality of trays  38  and  39  may be accommodated in the frame  21 . In this case, two or more types of food may be separately put on the trays  38  and  39 . 
     The partitioning plate  190  may include a front plate  191 . 
     An air suction port  192  through which air flows may be provided in the front plate  191 . The air suction port  192  may include a plurality of air holes, and each height or width of the plurality of air holes may be formed to have a size less than that of a user&#39;s finger. 
     One or more forming parts  193  for reinforcing strength and reducing thermal deformation may be provided on the front plate  191 . 
     Although not limited to locations, one or more forming parts may be located at a left side of the air suction port  192 , and one or more forming parts may be located at a right side of the air suction port  192 . 
     Further, one or more forming parts may be located at one or more sides of upper and lower sides of the air suction port  192 . 
     The partitioning plate  190  may further include an extension part  194  extending from the front plate  191  toward the rear wall  35  of the frame  21  and a contact part  197  bent from the extension part  194 . 
     One or more air outlets  195  and  196  for discharging air heated by the burner device  100  to the cooking chamber  22  may be provided in the extension part  194 . 
     The one or more air outlets  195  and  196  may include a first air outlet  195  and a second air outlet  196  which are vertically separated from each other and disposed. 
     The second air outlet  196  may be located at a lower level than the first air outlet  195 . For example the entire second air outlet  196  may be located under the first air outlet  195 . 
     Further, at least a part of the second air outlet  196  may be located at a lower level than the air suction port  192 . For example, the entire second air outlet  196  may be located at a lower level than the air suction port  192 . 
     A vertical length of the first air outlet  195  may be greater than that of the second air outlet  196 . In this case, the air discharged from the first air outlet  195  may uniformly flow in a vertical direction of the frame  21 . 
     For example, while the tray  38  is supported by a lowermost supporting part  37   a  of the plurality of supporting parts  37 , at least a part of the first air outlet  195  may be located above the tray  38 . 
     Further, in order to prevent the air discharged from the first air outlet  195  from being introduced into the air suction port  192  without heating food, a highest point  195   a  of the first air outlet  195  may be located at a lower level than a highest point  192   a  of the air suction port  192 . 
     While the tray  38  is supported by the lowermost supporting part  37   a , at least a part of the second air outlet  196  may be located at a lower level than the tray  38 . Alternatively, while the partitioning plate  190  is installed at the frame  21 , at least a part of the second air outlet  196  may be located at a lower level than the lowermost supporting part  37   a  of the plurality of supporting parts  37  provided on the frame  21 . 
     Therefore, while the tray  38  is supported by the lowermost supporting part  37   a  of the plurality of supporting parts  37  as shown in  FIG. 7 , air discharged from the second air outlet  196  flows under the tray  38  and a lower side of food F put on the tray  38  may be heated. 
     In the embodiment, in order to sufficiently heat the lower side of the food F by the air discharged from the second air outlet  196 , a width (i.e., a lateral length) of the second air outlet  196  may be greater than that of the first air outlet  195 . 
     The contact part  197  may be in contact with the rear wall  35  of the frame  21 . A fastening hole  198  to which a fastening member, which is not shown, is coupled may be provided in the contact part  197 . 
     While the partitioning plate  190  is coupled with the rear wall  35  of the frame  21  by the fastening member, a lower end of the partitioning plate  190  may be in contact with the bottom wall  32  of the frame  21 . That is, lower ends of the front plate  191  and the extension part  194  may be in contact with the bottom wall  32  of the frame  21 . 
     However, in a process of coupling the partitioning plate  190  with the rear wall  35  of the frame  21 , in some cases, the lower end of the partitioning plate  190  may be separated from the bottom wall  32  of the frame  21 . In this case, air may leak through a gap between the lower end of the partitioning plate  190  and the bottom wall  32  of the frame  21 . 
     In the embodiment, in order to prevent a gap from being generated between the lower end of the partitioning plate  190  and the bottom wall  32  of the frame  21 , one or more of the front plate  191  and the extension part  194  may include a contact rib  199  to be in contact with the bottom wall  32  of the frame  21 . The contact rib  199  may extend from the lower end of the partitioning plate  190  toward the frame  21  or the door  25 . 
     Here, the contact rib  199  may extend obliquely downward from the frame  21  so that a contact state of the contact rib  199  and the bottom wall  32  of the frame  21  is maintained. 
     Meanwhile, an air suction hole  32   b  through which air is introduced into the combustion chamber C may be formed in the bottom wall  32  of the frame  21 . 
     The air suction hole  32   b  is covered by the burner assembly  23  to prevent the air suction hole  32   b  from being exposed to the cooking chamber  22 . Therefore, it may prevent foreign materials in the cooking chamber  22  from passing through the air suction hole  32   b.    
     Of course, in the embodiment, as long as the air suction hole  32   b  is prevented from being exposed to the outside, the air suction hole  32   b  is not limited to the location thereof, and may also be located at the rear wall  35  or one sidewall of both of the sidewalls  31  of the frame  21 . 
     Hereinafter, a flow of air in the cooking device according to the embodiment will be described. 
     When the heating of food is needed of the burner assembly  23 , a gas is injected from the nozzle holder  220  to the burner  110 . Then, air around the supply part  120  (air outside the frame) together with the gas is supplied to the burner  110 . At this point, since low pressure is formed around the gas supplied to the burner  110 , the air around the burner  110  is naturally supplied to the burner  110  due to a pressure difference (in a natural ventilation method). 
     Therefore, when the air is supplied to the burner  110  in the natural ventilation method, the air necessary to burn the gas may not be sufficiently supplied to the burner  110 . In this case, the mixed gas in which the gas and the air are mixed may be incompletely burned in the burner  110 , and thus an amount of carbon monoxide may be increased due to the incomplete combustion. 
     However, according to the present invention, since the air suction hole  32   b  is located in the bottom wall  32  of the frame  21 , additional air for burning the mixed gas of the burner  110  may be introduced into the combustion chamber C. 
     The additional air introduced into the combustion chamber C may flow toward the burner  110 . 
     Therefore, the air introduced into the combustion chamber C may smoothly flow toward the gas discharge holes  114  formed in the burner  110 . 
     Meanwhile, while the mixed gas is supplied to the burner  110 , the mixed gas is ignited by the ignition unit  230 , and a flame is generated from the burner  110 . Further, the fan motor  212  is turned on and the fan  210  is rotated. 
     When the fan  210  is rotated, the air inside the cooking chamber  22  is introduced into the combustion chamber C through the air suction port  192  of the partitioning plate  190 . At this point, the air introduced into the combustion chamber C passes through an area formed by an inner circumferential surface  112  of the burner  110 . 
     The air introduced into the combustion chamber C is heated by the flame generated from the burner  110 , and then discharged from the combustion chamber C. 
     The air discharged from the combustion chamber C flows through an exhaust path P 1  between the second cover  160  and the rear wall  35  of the frame  21 , and then is discharged into the cooking chamber  22  through the air outlets  195  and  196  of the partitioning plate  190 . 
     In the case of the embodiment, the burner cover  130  independently forms the combustion chamber C, and the combustion chamber C and the exhaust path P 1  are divided by the burner cover  130 . 
     Therefore, the air flowing through the exhaust path P 1  may be prevented from being reintroduced into the combustion chamber C. 
     According to the proposed invention, a burner assembly may be coupled to the rear wall or one sidewall of the frame. That is, since the burner assembly is not located under the frame, the burner assembly is installed at the rear wall or one sidewall of the frame, and accordingly, a recessed part recessed under the bottom wall of the frame is able to be formed, the capacity of the frame may be increased. 
     Further, since an opening exposed to the outside does not exist at the bottom wall of the frame, foreign materials may be prevented from passing through the frame. 
     Further, since a vertical length of the first air outlet of the partitioning plate is greater than that of the second air outlet, the air discharged from the first air outlet may be uniformly discharged in a vertical direction of the frame. 
     Further, since the second air outlet is located at a lower level than the tray while the tray is supported by the lowermost supporting part, the air discharged from the second air outlet flows under the tray, and then a lower side of food put on the tray may be heated. 
       FIG. 8  is a perspective view of a partitioning plate according to a second embodiment, and  FIG. 9  is a view illustrating a flow of air in a cooking device according to the second embodiment. 
     In the embodiment, a structure of a partitioning plate and a flow of air based on the structure are different from those of the first embodiment and other things are the same as those of the first embodiment. Therefore, only specific features of the embodiment will be described below and descriptions of parts the same as those of the first embodiment will be omitted. 
     Referring to  FIGS. 8 and 9 , a partitioning plate  290  according to the embodiment may include a front plate  291  provided with an air suction port  292 . 
     The partitioning plate  290  may further include an extension part  294  extending from the front plate  291  to the rear wall of the frame  21 , and a contact part  297  bent from the extension part  294 . 
     The partitioning plate  290  may further include a plurality of air outlets  295  and  296 . The plurality of air outlets  295  and  296  may include a first air outlet  295  and a second air outlet  296  which are vertically separated from each other and disposed. 
     The second air outlet  296  may be located at a lower level than the first air outlet  295 . 
     For example, the first air outlet  295  may be provided in the extension part  294 , and the second air outlet  296  may be provided in the front plate  291 . 
     The second air outlet  296  may be located at a lower level than the air suction port  292  in the front plate  291 . 
     Although not limited to the above arrangement, two or more second air outlets  296  may be horizontally separated from each other and disposed in the front plate  291 . For example, at least a part of the air suction port  292  may be located in a region corresponding to a region between the two second air outlets  296 . 
     A height relationship between the second air outlet  296  and a lowermost supporting part  37   a  and a height relationship between the first air outlet  295  and the lowermost supporting part  37   a  may be the same as the first embodiment, and thus detailed descriptions thereof will be omitted. 
     The partitioning plate  290  may further include a flow guide  300  which guides a flow of air discharged through the second air outlet  296 . 
     The flow guide  300  guides the air discharged from the second air outlet  296  to flow to the center of a lower portion of the cooking chamber  22 . Therefore, since heated air flows upward from the center of the lower side regardless of a location of the tray in the cooking chamber, food may be cooked quickly. 
     The flow guide  300  may include a fastening part  310  to be coupled to the partitioning plate  190 , and a guide part  320  which extends from the fastening part  310  and guides a flow of air to be discharged through the second air outlet  296 . 
     The fastening part  310  may be connected to the partitioning plate  290  by hooks, or may be connected to the partitioning plate  290  by screws. 
     For example, the fastening part  310  may be coupled to a rear surface of the front plate  291 . The guide part  320  extends toward the extension part  294  and is inclined toward the rear thereof. Therefore, the flow guide  300  is located in the air flow chamber. Further, the guide part  320  may be obliquely disposed with respect to each of the front plate  291  and the extension part  29 . 
     Further, at least a part of the guide part  320  may be disposed to overlap the second air outlet  296  in a forward and backward direction. 
       FIG. 10  is a perspective view of a partitioning plate according to a third embodiment. 
     In the embodiment, a structure of a guide in a partitioning plate is different from that of the second embodiment and other things are the same as those of the second embodiment. Therefore, only specific features of the embodiment will be described below and descriptions of parts the same as those of the second embodiment will be omitted. 
     Referring to  FIG. 10 , a partitioning plate  290  according to the embodiment may include a flow guide  330  to be coupled to an extension part  294 . The flow guide  330  may include a fastening part  332  to be coupled to the extension part  294 , and a guide part  334  extending from the fastening part  332  toward a second air outlet  296   a.    
     The guide part  334  may obliquely extend toward the second air outlet  296   a . As another example, the fastening part  332  may be coupled to a front plate  291 . 
     The guide part  334  may be obliquely disposed with respect to each of the front plate  291  and the extension part  294 . Further, the guide part  334  may have a planar or rounded surface. 
       FIG. 11  is a perspective view of a partitioning plate according to a fourth embodiment, and  FIG. 12  is an enlarged view of portion A shown in  FIG. 11 . 
     In the embodiment, a structure of a guide in a partitioning plate is different from that of the second embodiment and other things are the same as those of the second embodiment. Therefore, only specific features of the embodiment will be described below and descriptions of parts the same as those of the second embodiment will be omitted. 
     Referring to  FIGS. 11 and 12 , a partitioning plate  390  according to the embodiment may include a front plate  391  provided with an air inlet  392 . 
     The partitioning plate  390  may further include an extension part  394  extending from the front plate  391 . 
     The extension part  394  may include a plurality of air outlets  395 ,  396 , and  397 . 
     The plurality of air outlets  395 ,  396 , and  397  may include a first air outlet  395 , a second air outlet  396  vertically separated from the first air outlet  395  and disposed, and a third air outlet  397  horizontally separated from the first air outlet  395  and disposed. 
     For example, the second air outlet  396  may be located under the first air outlet  395 . 
     For example, the third air outlet  397  may be separated from the first air outlet  395  in a forward and backward direction and disposed. A height of at least one point of the third air outlet  397  may be equal to a height of one point of the first air outlet  395 . In  FIG. 12 , for example, the same heights from a lower end of the partitioning plate  390  to the first and third air outlets  395  and  397  are illustrated. 
     A height relationship between the second air outlet  396  and a lowermost supporting part of a plurality of supporting parts in the frame may be the same as that described with reference to the first embodiment, and thus a detailed description thereof will be omitted. 
     Vertical lengths of one or more of the first air outlet  395  and third air outlet  397  may be greater than a vertical length of the second air outlet  396 . A width of the second air outlet  396  may be greater than widths of one or more of the first air outlet  395  and third air outlet  397 . 
     The partitioning plate  390  may further include a flow guide  400  which guides a flow of air discharged from one or more of the first and third air outlets  395  and  397 . 
     For example,  FIG. 12  shows that the air discharged from each of the first and third air outlets  395  and  397  is guided by the flow guide  400 . 
     The flow guide  400  may further include a guide part  410  obliquely extending from the extension part  394 , and connecting parts  412  and  414  which connect upper and lower ends of the guide part  410  to the extension part  394 . 
     When the partitioning plate  390  is located in a cooking chamber, the guide part  410  may obliquely extend from the frame  21  toward a front side thereof. 
     According to the embodiment, the air discharged from one or more of the first and third air outlets  395  and  397  flows along the flow guide  400 , then the air flows toward the door, and thus the air may be uniform in the cooking chamber. 
     The partitioning plate  390  may further include a contact rib  399  to be in contact with the bottom wall  32  of the frame  21 . The contact rib  399  may extend from a lower end of the partitioning plate  390  toward the frame  21  or the door  25 . 
     Although the cooking device is described to include one oven unit in the above embodiments, in the case of a cooking device provided with a plurality of oven units arranged in a vertical or lateral direction, a burner assembly may be provided in some or each of the plurality of oven units. 
     Even though all the elements of the embodiments are coupled into one or operated in the combined state, the present disclosure is not limited to such an embodiment. That is, all the elements may be selectively combined with each other without departing from the scope of the invention. Furthermore, when it is described that one comprises (or includes or has) some elements, it should be understood that it may comprise (or include or have) only those elements, or it may comprise (or include or have) other elements as well as those elements if there is no specific limitation. Unless otherwise specifically defined herein, all terms comprising technical or scientific terms are to be given meanings understood by those skilled in the art. Like terms defined in dictionaries, generally used terms needs to be construed as meaning used in technical contexts and are not construed as ideal or excessively formal meanings unless otherwise clearly defined herein. 
     Although embodiments have been described with reference to a number of illustrative embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the preferred embodiments should be considered in a descriptive sense only and not for purposes of limitation, and also the technical scope of the invention is not limited to the embodiments. Furthermore, the present invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being comprised in the present disclosure.