Patent Publication Number: US-10309659-B2

Title: Gas oven

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 14/136,008 filed on Dec. 20, 2013, which claims the benefit of the Korean Patent Application No. 10-2012-0150580, filed on Dec. 21, 2012, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Field 
     Embodiments of the present disclosure relate to a gas oven configured to use a cooking cavity divided into a plurality of individual cooking cavities by a divider. 
     2. Description of the Related Art 
     A gas oven is an home appliance provided with a cooking cavity in which a food substance is accommodated, a burner configured to generate heat by combusting gas and air to cook the food substance accommodated in the cooking cavity by applying heat at high temperature, a gas supplying passage configured to supply gas to the burner, and an ignition device configured to generate a spark. 
     As is widely known, air is needed for combustion to occur, and after the combustion occurs, combustion gas, which is waste gas, is generated, and thus the gas oven is further provided with an air supplying passage configured to supply air to the cooking cavity, and an air discharging passage configured to discharge waste gas of the cooking cavity. 
     The air supplying passage and the air discharging passage allow an inside of the cooking cavity to communicate with an outside of the body of the gas oven. At this time, by the difference in density, warm air is ascended and cold air is descended, and thus the air supplying passage is provided in a way to communicate at a lower portion of the cooking cavity, and the air discharging passage is provided in a way to communicate at an upper portion of the cooking cavity. 
     SUMMARY 
     Therefore, it is an aspect of the present disclosure to provide a gas oven configured to cook a cooking substance by using a whole area of a cooking cavity or by dividing a cooking cavity into a plurality of individual cooking cavities and using at least one of the plurality of individual cooking cavities. 
     It is another aspect of the present disclosure to provide a gas oven, having a plurality of burners respectively provided at an upper portion and a lower portion of a cooking cavity of the gas oven, capable of simultaneously operating the plurality of burners. 
     Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the disclosure. 
     In accordance with an embodiment of the present disclosure, a gas oven includes a body, a cooking cavity, a first burner, a second burner, a main air supplying passage, a main air discharging passage, a subsidiary air supplying device, and a subsidiary air discharging device. The cooking cavity may be formed at an inside of the body and formed to be dividable by a divider detachably mounted at the cooking cavity into a first individual cooking cavity at an upper portion of the body and a second individual cooking cavity at a lower portion of the body. The first burner may be provided at the first individual cooking cavity. The second burner may be provided at the second individual cooking cavity. The main air supplying passage may be configured to communicate the second individual cooking cavity with an outside of the body to supply air to the second individual cooking cavity. The main air discharging passage may be configured to communicate the first individual cooking cavity with the outside of the body to discharge waste gas of the first individual cooking cavity. The subsidiary air supplying device, in a case when the divider is mounted at the cooking cavity or in a case when the first burner and the second burner are simultaneously operated, may be configured to supply air to the first individual cooking cavity, and in a case when the first burner and the second burner are simultaneously operated, may be configured to forcedly supply air to the first individual cooking cavity. The subsidiary air discharging device, in a case when the divider is mounted at the cooking cavity, may be configured to discharge waste air of the second individual cooking cavity. 
     The subsidiary air supplying device may include a subsidiary air supplying passage configured to communicate the first individual cooking cavity with the outside of the body, an air supplying damper to open/close the subsidiary air supplying passage, and an air supplying fan configured to forcedly move air. 
     The gas oven may further include an air supplying duct configured to form the subsidiary air supplying passage. The first burner may include an inlet hole disposed at an inside of the air supplying duct in a way that at least a portion of air that flows at an inside of the air supplying duct is introduced to an inside of the first burner. 
     The air supplying duct may include an overflow hole provided in a way that a remaining portion of the air that flows at the inside of the air supplying duct escapes to an outside of the air supplying duct to flow to surround the first burner. 
     In a case when the divider is separated from the cooking cavity and one of the first burner and the second burner is operated, the subsidiary air supplying device may shut off the subsidiary air supplying passage. 
     In a case when a self cleaning of the gas oven is performed, the subsidiary air supplying device may shut off the subsidiary air supplying passage. 
     The subsidiary air discharging device may include a subsidiary air discharging passage configured to communicate the second individual cooking cavity with an outside of the body, and an air discharging damper to open/close the subsidiary air discharging passage. 
     The subsidiary air discharging passage may be separately provided from the main air discharging passage, or join the main air discharging passage at one point of the main air discharging passage. 
     In a case when the divider is separated from the cooking cavity, the subsidiary air discharging device may shut off the subsidiary air discharging passage. 
     In a case when a self cleaning of the gas oven is being performed, the subsidiary air discharging device may shut off the subsidiary air discharging passage. 
     In accordance with another aspect of the present disclosure, a gas oven includes a body, a cooking cavity, a first burner, a second burner, a first air supplying passage, a first air discharging passage, a second air supplying passage, a second air discharging passage, an air supplying damper, an air supplying fan and an air discharging damper. The cooking cavity may be formed at an inside of the body and formed to be dividable by a divider detachably mounted at the cooking cavity into a first individual cooking cavity at an upper portion of the body and a second individual cooking cavity at a lower portion of the body. The first burner may be provided at the first individual cooking cavity. The second burner may be provided at the second individual cooking cavity. The first air supplying passage may be configured to communicate the first individual cooking cavity with an outside the body to supply air to the first individual cooking cavity. The first air discharging passage may be configured to communicate the first individual cooking cavity with an outside of the body to discharge waste gas of the first individual cooking cavity. The second air supplying passage may be configured to communicate the second individual cooking cavity with an outside of the body to supply air to the second individual cooking cavity. The second air discharging passage may be configured to communicate the second individual cooking cavity with an outside of the body to discharge waste gas of the second individual cooking cavity. The air supplying damper may be configured to open/close the first air supplying passage, depending on whether the divider is attached/detached. The air supplying fan may be configured to forcedly move air at an outside the body to the first individual cooking cavity through the first air supplying passage, depending on whether the first burner and the second burner are simultaneously operated. The air discharging damper may be configured to open/close the second air discharging passage, depending on whether the divider is attached/detached. Further, the gas oven may have a first mode during which the divider is mounted and only the first burner is operated, a second mode during which the divider is mounted and only the second burner is operated, a third mode during which the divider is mounted and the first burner and the second burner are simultaneously operated, a fourth mode during which the divider is separated and only the first burner is operated, a fifth mode during which the divider is separated and only the second burner is operated, and a sixth mode during which the divider is separated and the first burner and the second burner are simultaneously operated. 
     In the first mode, the air supplying damper may be open so that air is supplied to the first individual cooking cavity. 
     In the second mode, the air discharging damper may be open so that waste air of the second individual cooking cavity is discharged. 
     In the third mode, the air supplying damper may be open and the air supplying fan may be operated so that air is forcedly supplied to the first individual cooking cavity, and the air discharging damper is open so that waste gas of the second individual cooking cavity is discharged. 
     In the fourth mode and the fifth mode, the air supplying damper and the air discharging damper may be shut off, so that heat of the cooking cavity is prevented from being discharged through the second air supplying passage and the second air discharging passage. 
     In the sixth mode, the air supplying damper may be open and the air supplying fan may be operated so that air is forcedly supplied to the first individual cooking cavity, and the air discharging damper is closed so that heat of the second individual cooking cavity is prevented from being discharged through the second air discharging passage. 
     When a self cleaning of the gas oven is performed, the air supplying damper and the air discharging damper may be shut off, so that heat of the cooking cavity is prevented from being discharged through the second air supplying passage and the second air discharging passage. 
     In accordance with another aspect of the present disclosure, a gas oven includes a body, a cooking cavity, a first burner, a second burner, a main air supplying passage, a main air discharging passage and a forced air supplying device. The cooking cavity may be formed at an inside of the body. The first burner may be provided at an upper portion of the cooking cavity. The second burner may be provided at a lower portion of the cooking cavity. The main air supplying passage may be connected to a lower portion of the cooking cavity to supply air to the cooking cavity. The main air discharging passage may be connected to an upper portion of the cooking cavity to discharge waste gas of the cooking cavity to an outside of the body. The forced air supplying device may be configured to forcedly supply air to the first burner so that incomplete combustion by the waste gas generated at the second burner, in a case when the first burner and the second burner are simultaneously operated, is prevented from taking place at the first burner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a drawing illustrating an exterior appearance of a gas oven in accordance with an embodiment of the present disclosure. 
         FIG. 2  is a drawing illustrating an inside the gas oven of  FIG. 1 . 
         FIG. 3  is a schematic side sectional view of the gas oven of  FIG. 1 . 
         FIG. 4  is a drawing illustrating a subsidiary air supplying device of the gas oven of  FIG. 1 . 
         FIG. 5  is a drawing of an example of implementation of the subsidiary air supplying device of the gas oven of  FIG. 1 . 
         FIG. 6  is an exploded drawing illustrating the subsidiary air supplying device of  FIG. 5 . 
         FIG. 7  is a drawing of an example of implementation of a subsidiary air discharging device of the gas oven of  FIG. 1 . 
         FIG. 8  is an exploded drawing illustrating the subsidiary air discharging device of  FIG. 7 . 
         FIG. 9  is a control block diagram of the subsidiary air supplying device and the subsidiary air discharging device of the gas oven of  FIG. 1 . 
     
    
    
     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, wherein like reference numerals refer to like elements throughout. 
       FIG. 1  is a drawing illustrating an exterior appearance of a gas oven in accordance with an embodiment of the present disclosure, and  FIG. 2  is a drawing illustrating an inside the gas oven of  FIG. 1 . 
     Referring to  FIG. 1  and  FIG. 2 , a gas oven  1  includes a body  10 , a cooking cavity  40  provided at an inside of the body to accommodate a food substance therein, a plurality of burners  61  and  62  to generate heat by combusting gas, and a plurality of convection fans  51  and  52  to convect air of the cooking cavity  40 . 
     The cooking cavity  40  is formed in an approximate box shape by an upper portion wall  31 , a lower portion wall  32 , a left side wall  33 , a right side wall  34 , and a rear wall  35 , and is provided with a front surface thereof open for the input/output of a cooking substance. The open front surface of the cooking cavity  40  may be open and closed by a door  20  hingedly coupled to the body  10  so as to be rotatable in an upper side and lower side direction. At the door  20 , a handle  21  may be provided. 
     At an upper end of the body  10 , a cook top unit  13  at which a container filled with a food substance may be placed and configured to apply heat to the container, a display  11  to display various operational information of the gas oven  1 , and a manipulation unit  12  capable of manipulating the operation of the oven  1  may be provided. 
     Meanwhile, at an inside the cooking cavity  40 , a plurality of supporters  36  to mount a rack (not shown) at which a food substance may be placed. The plurality of supporters  36  may be protrudedly provided form the left side wall  33  and the right side wall  34 . 
     At the plurality of supporting fixtures  36 , a divider  43  capable of dividing the cooking cavity  40  may be detachably mounted. The divider  43  may be horizontally mounted at the cooking cavity  40  to divide the cooking cavity  40  into an individual cooking cavity at an upper portion  41  and an individual cooking cavity at a lower portion  42 . 
     Hereinafter, the individual cooking cavity at an upper portion  41  and the individual cooking cavity at a lower portion  42  will be referred to as a first individual cooking cavity  41  and a second individual cooking cavity  42 , respectively. The first individual cooking cavity  41  and the second individual cooking cavity  42  are not necessarily needed to be the same in terms of size with respect to each other, and the size of the first individual cooking cavity  41  and the second individual cooking cavity  42  each may be different to each other. The divider  43  includes insulation material, and may insulate the first individual cooking cavity  41  from the second individual cooking cavity  42 . 
     At the first individual cooking cavity  41 , one of the plurality of burners  61  and  62  is provided, and at the second individual cooking cavity  42 , the remaining one of the plurality of burners  61  and  62  is provided. Hereinafter, the burner  61  provided at the first individual cooking cavity  41  is referred to as a first burner  61 , and the burner  62  provided at the second individual cooking cavity  42  is referred to as a second burner  62 . Thus, the first burner  61  may radiate heat at the first individual cooking cavity  41 , and the second burner  62  may radiate heat at the second individual cooking cavity  42 . 
     In addition, at the first individual cooking cavity  41 , one convection fan  51  of the plurality of convection fans  51  and  52  is provided, and at the second individual cooking cavity  42 , the remaining one convection fan  52  of the plurality of convection fans  51  and  52  is provided. Thus, the convection fan  51  may convect the air of the first individual cooking cavity  41 , and the convection fan  52  may convect the air of the second individual cooking cavity  42 . 
     At a lower side of the cooking cavity  40 , a storage compartment  90  configured to store a cookware may be provided. The storage compartment  90  may be open and closed by a drawer  91  configured to be inserted into and withdrawn from in a sliding manner. At the drawer  91 , a handle  92  may be provided. 
     Meanwhile, the gas oven  1  is provided with a main air supplying passage  70  configured to communicate the second individual cooking cavity  42  with an outside the body  10  to supply air to the second individual cooking cavity  42 . As is widely known, for combustion to take place, gas, air and arc are needed, and through the main air supplying passage  70 , air for combustion may be supplied to the second individual cooking cavity  42 . The main air supplying passage  70  may be formed by a penetrating hole  70   a  passing through the lower portion wall  32 , the storage compartment  90 , and a through hole  70   b  being formed through the rear wall  35 . 
     The main air supplying passage  70 , in a case when the divider  43  is mounted at the cooking cavity  40 , may be able to supply air to the second individual cooking cavity  42 , and in a case when the divider  43  is separated from the cooking cavity  40 , the main air supplying passage  70  may be able to supply air to the entire are of the cooking cavity  40 . 
     In addition, the gas oven  1  is provided with a main air discharging passage  80  configured to communicate the first individual cooking cavity  41  with an outside of the body  10  to discharge waste gas of the first individual cooking cavity  41 . Here, the waste gas is referred to as the combustion gas that is generated after combustion, and in a case when gas is completely combusted, carbon monoxide and vapor are generated, and in a case when gas is not completely combusted, carbon monoxide, hydrogen and sulfur may be generated. When the waste gas as such remains without being discharged, incomplete combustion is generated at the burner, and thus waste gas needs to be discharged to an outside. 
     The main air discharging passage  80  may be formed by an air discharging hole  80   a  passing through the upper portion wall  31  and an air discharging duct  80   b  communicating the air discharging hole  80   a  with an outside of the body  10 . 
     The main air discharging passage  80 , in a case when the divider  43  is mounted at the cooking cavity  40 , may be able to discharge waste air of the first individual cooking cavity  41 , and in a case when the divider  43  is separated from the cooking cavity  40 , the main air discharging passage  80  may be able to discharge waste air of the entire are of the cooking cavity  40 . 
     In addition, the gas oven  1  is provided with a subsidiary air supplying device  100  configured to supply air to the first individual cooking cavity  41  naturally or forcedly. Fundamentally, the subsidiary air supplying device  100  is configured to supply air to the first individual cooking cavity  41  in a case when the divider  43  is mounted at the cooking cavity  40 . 
     This is because, in a case when the divider  43  is mounted at the cooking cavity  40 , the air being supplied to the second individual cooking cavity  42  through the main air supplying passage  70  is blocked from being moved to the first individual cooking cavity  41 . 
     Furthermore, the subsidiary air supplying device  100 , in a case when the first burner  61  and the second burner  62  are simultaneously operated, supplies air to the first individual cooking cavity  41 . Particularly, in the case as such, the subsidiary air supplying device  100  forcedly supplies air to the first individual cooking cavity  41 . In the aspect as such, the subsidiary air supplying device  100  may be referred to as a forced air supplying device  100 . The detailed structure and functionality of the subsidiary air supplying device  100  will be described later. 
     In addition, the gas oven  1  is provided with a subsidiary air discharging device  200  configured to discharge waste gas of the second individual cooking cavity  42 . The subsidiary air discharging device  200  is configured to discharge waste air of the second individual cooking cavity  42  in a case when the divider  43  is mounted at the cooking cavity  40 . 
     This is because, in a case when the divider  43  is mounted at the cooking cavity  40 , the waste air of the second individual cooking cavity  42  may not be able to be discharged through the main air discharging passage  80 . The detailed structure and functionality of the subsidiary air discharging device  200  will be described later. 
       FIG. 3  is a schematic side sectional view of the gas oven of  FIG. 1 ,  FIG. 4  is a drawing illustrating a subsidiary air supplying device of the gas oven of  FIG. 1 ,  FIG. 5  is a drawing of an example of implementation of the subsidiary air supplying device of the gas oven of  FIG. 1 , and  FIG. 6  is an exploded drawing illustrating the subsidiary air supplying device of  FIG. 5 . 
     Referring to  FIGS. 3 and 6 , the subsidiary air supplying device  100  may include a subsidiary air supplying passage  110  configured to communicate the first individual cooking cavity  41  with an outside of the body  10 , an air supplying damper  120  to open/close the subsidiary air supplying passage  110 , and an air supplying fan  130  configured to forcedly move the air at an outside the cooking cavity  40  to the first individual cooking cavity  41  through the subsidiary air supplying passage  110 . 
     The subsidiary air supplying passage  110  may be able to pass through both the rear wall  35  of the cooking cavity  40  and an outside case  14  of the body  10 . The subsidiary air supplying passage  110  may be formed at an inside an air supplying duct  111  ( FIG. 4 ). A portion of the air supplying duct  111  may be disposed at the first individual cooking cavity  41 . At the air supplying duct  111 , an insertion hole  113  into which the first burner  61  is inserted is provided, and through the insertion hole  113 , a head part  66  of the first burner  61  may be inserted into an inside the air supplying duct  111 . 
     Gas and air may be introduced to an inside space  63  of the first burner  61  through the head part  66 . The gas is guided to an inside the head part  66  through a gas supplying passage  300 , and may be jetted to the inside space  63  of the first burner  61  through a nozzle  320  provided at an end portion of the gas supplying passage  300 . The gas supplying passage  300  may be fixed to the rear wall  35  by a holder  310 . 
     When the gas is jetted to the inside space  63  of the first burner  61  through the nozzle  320 , a portion of the air inside the air supplying duct  111  may be drawn into the inside space  63  of the first burner  61  together with the gas through the inlet hole  64  formed at the head part  66 . 
     The gas and air being introduced to the inside space  63  of the first burner  61  are mixed at the inside space  63  of the first burner  61 , and may be discharged through an outlet hole  65  ( FIG. 3 ) of the first burner  61 . The mixed gas may be combusted by the arc that is ignited at an ignition device (not shown). At this time, the air being introduced to the first burner  61  together with the gas may be referred to as a first air. 
     Meanwhile, the remaining portion of the air inside the air supplying duct  111  may be supplied to the first individual cooking cavity  41  after escaping from the air supplying duct  111  through an overflow hole  112  formed at the air supplying duct  111 . 
     The air being supplied to the first individual cooking cavity  41  through the overflow hole  112  flows to the surroundings of the outlet hole  65  of the first burner  61  to be mixed and combusted with the gas being discharged through the outlet hole  65 . At this time, as the above, the air that flows to the surroundings of the outlet hole  65  of the first burner  61  through the overflow hole  112  may be referred to as a second air. 
     Thus, the first burner  61  generates combustion by receiving the first air and the second air. 
     Meanwhile, the air supplying fan  130  forcedly sucks the air from an outside of the cooking cavity  40  and moves the air to an inside of the first burner  61  or to the surroundings of the first burner  61 . As the above, the air supplying fan  130  forcedly flows air as to have the first burner  61  and the second burner  62  operate in a simultaneous manner. 
     This is because, in a case when the first burner  61  and the second burner  62  simultaneously operate, the waste gas generated from the second burner  62  ascends to move to the surroundings of the first burner  61 , and by the waste gas introduced to the surroundings of the first burner  61  as the above, incomplete combustion takes place at the first burner  61 . From a different perspective, the supply of the second air to the first burner  61  becomes difficult due to the waste gas of the second burner  62 . 
     Thus, for the first burner  61  and the second burner  62  to simultaneously operate, the amount of a portion of the air being forcedly supplied by the air supplying fan  130 , which is discharged through the overflow hole  112 , needs to be sufficient to push out the waste gas of the second burner  62  to the air discharging passage  80 . 
     Meanwhile, not to mention the case when the divider  43  is separated from the cooking cavity  40 , in a case when the divider  43  is mounted at the cooking cavity  40 , a forced supply of air is needed by the air supplying fan  130 . This is because, even in a case when the divider  43  is mounted at the cooking cavity  40 , the waste gas of the second burner  62  may be introduced to the surroundings of the first burner  61  through a gap in between the divider  43  and the door  20  and a gap in between the divider  43  and both side walls  33  and  34  ( FIG. 2 ), as well as through a gap in between the divider  43  and the rear wall  35 . 
     Meanwhile, in a case when the divider  43  is separated from the cooking cavity  40  and when one of the first burner  61  and the second burner  62  is operated, the air supplying damper  120  needs to shut off the subsidiary air supplying passage  110 . This is because, in the case as such, the supplying of air to the cooking cavity  40  takes place through the main air supplying passage  70  and the discharging of the waste gas of the cooking cavity  40  may take place through the main air discharging passage  80 , and in a case when the subsidiary air supplying passage  110  is open, a high-temperature waste gas of the cooking cavity  40  may be excessively discharged. 
     In addition, in a case when the gas oven  1  performs a self cleaning at high temperature, the air supplying damper  120  needs to shut off the subsidiary air supplying passage  110 . 
     Meanwhile, the subsidiary air supplying device  100  may be specified within the limit where the technical aspects of the present disclosure may be achieved. On  FIG. 5  and on  FIG. 6 , an example of the subsidiary air supplying device  100  is illustrated. 
     As illustrated on  FIGS. 5 and 6 , the subsidiary air supplying device  100  may include the air supplying duct  111  forming the subsidiary air supplying passage  110 , the air supplying damper  120  to open/close the subsidiary air supplying passage  110 , a damper driving motor  122  to drive the air supplying damper  120 , the air supplying fan  130  to forcedly flow air, a fan motor  131  to drive the air supplying fan  130 , and a detection switch  125  to detect the operational status of the air supplying damper  120 . 
     The air supplying duct  111  may include a first duct part  111   a , a second duct part  111   b , and a third duct part  111   c . The first duct part  111   a , the second duct part  111   a , and the third duct part  111   c  may be connected to one another. The first duct part  111   a  may be disposed between the rear wall  35  ( FIG. 3 ) and the outside case  14  ( FIG. 3 ), and the second duct part  111   b  and the third duct part  111   c  may be disposed at an outside of the outside case  14 . 
     The air supplying duct  111  may further include a mixed flow duct part (not shown) connected to the first duct part  111   a  and disposed at an inside the first individual cooking cavity  41 . Into the mixed flow duct part, the gas supplying passage  300  ( FIG. 4 ) and the first burner  61  may be inserted. At the mixed flow duct part the overflow hole  112  may be formed. 
     The first duct part  111   a  and the second duct part  111   b  each may be coupled to a supporting bracket  126 . The supporting bracket  126  may be coupled to the outside case  14  ( FIG. 3 ) by a coupling member ‘S 1 ’. 
     The air supplying damper  120  may be rotatably coupled to the first duct part  111   a  while having a hinge shaft  121  as a center of the rotation. The air supplying damper  120  may be provided to be disposed at an inside the first individual cooking cavity  41 , or may be provided to be disposed in between the rear wall  35  ( FIG. 3 ) and the outside case  14  ( FIG. 3 ). 
     The damper driving motor  122  to drive the air supplying damper  120  may be coupled to the second duct part  111   b . To an output shaft of the damper driving motor  122 , a rotating lever  123  having an approximate cylinder shape is coupled, so that the rotating lever  123  may be able to rotate at the time when the damper driving motor  122  is operated. 
     The rotating lever  123  includes an insertion bar  123   a  protruding from a location spaced apart by a predetermined distance from a rotating shaft thereof, and the insertion bar  123   a  may be inserted into an insertion hole  124   a  formed at a pressing lever  124 . At this time, the insertion hole  124   a  of the pressing lever  124  is formed in lengthways in the vertical direction, so that the rotating motion of the rotating lever  123  may be converted into a linear motion toward the horizontal direction of the pressing lever  124 . 
     The pressing lever  124  includes a pressing bar  124   b  formed in lengthways in approximately the horizontal direction, and the pressing bar  124   b  is provided to be in contact with the air supplying damper  120 . Thus, according to the rotational direction of the rotating lever  123 , the pressing bar  124   b  of the pressurizing lever  124  may move toward a direction in which the air supplying damper  120  is pushed, or toward a direction opposite to a direction in which the air supplying damper  120  is pushed. 
     When the pressing bar  124   b  of the pressing lever  124  pushes the air supplying damper  120 , the air supplying damper  120  may be open, and when the pressing lever  124  is moved toward an opposite direction to the direction in which the air supplying damper  120  is pushed, the air supplying damper  120  may be closed by the self gravity thereof. 
     The detection switch  125  may be coupled to the second duct part  111   b  to detect whether or not the air supplying damper  120  is open or the degree of opening of the air supplying damper  120 . The detection switch  125 , by measuring the rotational direction and the amount of rotation of the rotating lever  123 , may be able to detect whether or not the air supplying damper  120  is open or the degree of opening of the air supplying damper  120 . 
     The third duct part  111   c  may be provided with the shape of a scroll, and may be coupled to the second duct part  111   b  by a coupling bracket  127 . At a fan installing part  111   d  of the third duct part  111   c , the air supplying fan  130  may be installed. The air supplying fan  120  may be a centrifugal fan. 
     Referring to  FIG. 3  again, the subsidiary air discharging device  200  may include a subsidiary air discharging passage  210  configured to communicate the second individual cooking cavity  42  with an outside the cooking cavity  40 , and an air discharging damper  220  configured to open and close the subsidiary air discharging passage  210 . 
     The subsidiary air discharging passage  210  may join the main air discharging passage  80  while being vertically extended at a space in between the rear wall  35  of the cooking cavity  40  and the outside case  14  of the body  10 . However, differently from the previous embodiments, the subsidiary air discharging passage  210  may be independently extended to an outside the body  10  without joining the main air discharging passage  80 . Through the structure as the above, the waste gas of the second individual cooking cavity  42  may be discharged to an outside of the body  10 . 
     Meanwhile, in a case when the divider  43  is separated from the cooking cavity  40 , the air discharging damper  220  needs to shut off the subsidiary air discharging passage  210 , since in the case as such, the waste gas of the cooking cavity  40  may be discharged through the main air discharging passage  80 , and when the subsidiary air discharging passage  210  is open, the high-temperature waste gas of the cooking cavity  40  may be excessively discharged through the subsidiary air discharging passage  210 . 
     In addition, in a case when the gas oven  1  performs a self cleaning at high temperature, the air discharging damper  220  needs to shut off the subsidiary air discharging passage  210 . 
     Meanwhile, the subsidiary air discharging device  200  may be specified within the limit where the technical aspects of the present disclosure may be achieved. On  FIG. 7  and on  FIG. 8 , an example of the subsidiary air discharging device  200  is illustrated. 
     As illustrated on  FIGS. 7 and 8 , the subsidiary air discharging device  200  may include an air discharging duct part  211  forming the subsidiary air discharging passage  210 , the air discharging damper  220  to open/close the subsidiary air discharging passage  210 , a damper driving motor  222  to drive the air discharging damper  220 , and a detection switch  225  to detect the operational status of the air discharging damper  220 . 
     The air discharging duct part  211  may be disposed in between the rear wall  35  ( FIG. 3 ) and the outside case  14  ( FIG. 3 ). The subsidiary air discharging device  200  may further include an extension duct part (not shown) connecting the air discharging duct  211  to the main air discharging passage  80  or connecting the air discharging duct part  211  to an outside of the body  10 . The air discharging duct part  211  may form the subsidiary air discharging passage  210  in cooperation with the extension duct part. 
     The air discharging duct part  211  may be coupled to a supporting bracket  226 . The supporting bracket  126  may be coupled to the rear wall  35  ( FIG. 3 ) by a coupling member ‘S 2 ’. 
     The air discharging damper  220  may be rotatably coupled to the air discharging duct part  211  while having a hinge shaft  221  as a center of the rotation. The air discharging damper  220  may be provided to be disposed at an inside the second individual cooking cavity  42 , or may be provided to be disposed in between the rear wall  35  ( FIG. 3 ) and the outside case  14  ( FIG. 3 ). 
     The damper driving motor  222  to drive the air discharging damper  220  may be coupled to a coupling bracket  227 . To an output shaft of the damper driving motor  222 , a rotating lever  223  having an approximate cylinder shape is coupled, so that the rotating lever  223  may be able to rotate at the time when the damper driving motor  222  is operated. 
     The rotating lever  223  includes an insertion bar  223   a  protruded from a location spaced apart by a predetermined distance from a rotating shaft thereof, and the insertion bar  223   a  may be inserted into an insertion hole  224   a  formed at a pressing lever  224 . At this time, the insertion hole  224   a  of the pressing lever  224  is formed lengthways in a vertical direction, so that the rotating motion of the rotating lever  223  may be converted into a linear motion toward the horizontal direction of the pressing lever  224 . 
     The pressing lever  224  includes a pressing bar  224   b  formed lengthways in approximately the horizontal direction, and the pressing bar  224   b  is provided to be in contact with respect to the air discharging damper  220 . Thus, according to the rotational direction of the rotating lever  223 , the pressing bar  224   b  of the pressing lever  224  may move toward a direction in which the air discharging damper  220  is pushed, or toward a direction opposite to the direction in which the air discharging damper  220  is pushed. 
     When the pressing bar  224   b  of the pressing lever  224  pushes the air discharging damper  220 , the air discharging damper  220  may be open, and when the pressing lever  224  is moved toward an opposite direction to the direction in which the air discharging damper  220  is pushed, the air discharging damper  220  may be closed by the self gravity thereof. 
     The detection switch  225  may be able to detect whether or not the air discharging damper  220  is open or the degree of opening of the air discharging damper  220  while being coupled to the coupling bracket  227 . The detection switch  225 , by measuring the rotational direction and the amount of rotation of the rotating lever  223 , may be able to detect whether or not the air discharging damper  220  is open or the degree of opening of the air discharging damper  220 . 
       FIG. 9  is a control block diagram of the subsidiary air supplying device and the subsidiary air discharging device of the gas oven of  FIG. 1 . Hereafter, referring to  FIGS. 1 to 9 , the operation and the control method of the gas oven in accordance with the embodiment of the present disclosure will be described. 
     The subsidiary air supplying device  100  and the subsidiary air discharging device  200  are selectively driven, depending on whether the divider  43  is mounted, the first burner  61  is operated, and the second burner  62  is operated. 
     For the above, the gas oven  1  includes a divider detaching detection unit  410  to detect whether or not the divider  43  is mounted, a first burner operation detection unit  420  to detect whether or not the first burner  61  is operated, a second burner operation detection unit  430  to detect whether or not the second burner  62  is operated, and a control unit  440  configured to drive the subsidiary air supplying device  100  and the subsidiary air discharging device  200  according to whether the divider  43  is mounted, the first burner  61  is operated, and the second burner  62  is operated. 
     The divider detaching detection unit  410  may include a divider detection switch  44  ( FIG. 3 ). The divider detection switch  44 , through the physical pressure applied by the divider  43 , may be able to detect whether or not the divider  43  is mounted. 
     The operation of the first burner  61  and the second burner  62  may be selected by the choice of a user, and thus, the first burner operation detection unit  420  and the second burner operation detection unit  430  may be able to detect whether or not the first burner  61  and the second burner  62  are operated, respectively, through a manipulation signal that is input to the manipulation unit  12 . 
     Thus, the gas oven  1  may be used under the total of six modes, depending on whether or not the divider  43  is mounted, and the first burner  61  and the second burner  62  are operated. 
     That is, the gas oven  1  may have a first mode during which the divider  43  is mounted and only the first burner  61  is operated, a second mode during which the divider  43  is mounted and only the second burner  62  is operated, a third mode during which the divider  43  is mounted and the first burner  61  and the second burner  62  are simultaneously operated, a fourth mode during which the divider  43  is separated and only the first burner  61  is operated, a fifth mode during which the divider  43  is separated and only the second burner  62  is operated, and a sixth mode during which the divider  43  is separated and the first burner  61  and the second burner  62  are simultaneously operated. 
     The opening/closing of the air supplying damper  120 , the operation of the air supplying fan  130 , and the opening/closing of the air discharging damper  220  at each mode may be summarized as below. 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                 Mounting of Divider/ 
                   
                   
                 Air 
               
               
                   
                 Operation of First Burner 
                 Air Supplying 
                 Air Supplying 
                 Discharging 
               
               
                 Modes 
                 and Second Burner 
                 Damper 
                 Fan 
                 Damper 
               
               
                   
               
             
            
               
                 First Mode 
                 Divider is mounted/ 
                 Open 
                   
                   
               
               
                   
                 Only First Burner is operated 
               
               
                 Second Mode 
                 Divider is mounted/ 
                   
                   
                 Open 
               
               
                   
                 Only Second Burner is operated 
               
               
                 Third Mode 
                 Divider is mounted/ 
                 Open 
                 Operated 
                 Open 
               
               
                   
                 Both First Burner and 
               
               
                   
                 Second Burner are operated 
               
               
                 Fourth Mode 
                 Divider is separated/ 
                 Closed 
                   
                 Closed 
               
               
                   
                 Only First Burner is operated 
               
               
                 Fifth Mode 
                 Divider is separated/ 
                 Closed 
                   
                 Closed 
               
               
                   
                 Only Second Burner is operated 
               
               
                 Sixth Mode 
                 Divider is separated/ 
                 Open 
                 Operated 
                 Closed 
               
               
                   
                 Both First Burner and 
               
               
                   
                 Second Burner are operated 
               
               
                   
               
            
           
         
       
     
     That is, in the first mode, the air supplying damper  120  is open so that air may be supplied to the first individual cooking cavity  41 . 
     In the second mode, the air discharging damper  220  is open so that the waste air of the second individual cooking cavity  42  may be discharged. 
     In the third mode, the air supplying damper  120  is open and the air supplying fan  130  is operated so that air may be forcedly supplied to the first individual cooking cavity  41 , and the air discharging damper  220  is open so that the waste air of the second individual cooking cavity  42  may be discharged. 
     In the fourth mode and the fifth mode, the air supplying damper  120  and the air discharging damper  220  are closed so that the heat of the cooking cavity  40  is prevented from being discharged through the subsidiary air supplying passage  110  and the subsidiary air discharging passage  210 . 
     In the sixth mode, the air supplying damper  120  is open and the air supplying fan  130  so that air may be forcedly supplied to the first individual cooking cavity  41 , and the air discharging damper  220  is closed so that the heat of the second individual cooking cavity  42  is prevented from being discharged through the subsidiary air discharging passage  210 . 
     Through the operations as the above, the gas oven  1  in accordance with one aspect of the present disclosure may be able to perform a cooking using various cooking conditions by the reference and the need of a user. 
     Meanwhile, the aspect of the present disclosure is not limited to the gas oven  1  provided with the divider  43 , and may be applied to a case of the gas oven  1  having the plurality of burners  61  and  62  without the divider  43 . In a case of the conventional gas oven, the waste gas generated from the lower portion burner  62  flows to the surroundings of the upper portion burner  61 , and as a result, incomplete combustion is occurred at the upper portion burner  61 , and thus the plurality of burners  61  and  62  are not able to be simultaneously operated, but in accordance with the aspect of the present disclosure, by effectively supplying combustion-purpose air to the upper portion burner  61  through the subsidiary air supplying device  100 , the plurality of burners  61  and  62  may be simultaneously operated. 
     As is apparent from the above description, foodstuff can be cooked by using a cooking cavity of the gas as a whole, or by dividing a cooking cavity into a plurality of individual cooking cavities and using at least one of the plurality of cooking cavities. 
     In addition, foodstuff can be cooked by simultaneously operating an upper burner and a lower burner that are provided at a cooking cavity. 
     Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.