Abstract:
A gas cooker that includes a case defining an interior area, the case including an opening to the interior area; a plate covering, fully or in part, the opening of the case; a burner that is located in the interior area of the case, wherein the burner includes a heating element that is heated using gas; a vent that is located at a first position of the case and that is configured to discharge burned gas from the interior area of the case to an exterior of the case; an insulating case that is coupled to the burner and that is configured to hold the burner; and a first insulator that is coupled between the insulating case and the plate and that is configured to seal an interior space of the burner is disclosed.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    The application claims priority under 35 U.S.C. §119 and 35 U.S.C. §365 to Korean Patent Application No. 10-2015-0125177 filed on Sep. 3, 2015 whose entire disclosure is hereby incorporated by reference. 
       TECHNICAL FIELD 
       [0002]    The present disclosure generally relates to a gas cooker. 
       BACKGROUND 
       [0003]    A gas cooker is a home appliance that cooks food using heat. The gas cooker provides heat using gas. 
         [0004]    The gas cooker is classified into an open-flame type in which a burner is exposed to an outside of a product, and flame directly heats food or heats a container in which the food is put, and a radiant type in which the burner is provided inside the product, and a radiator is heated using combustion heat, and the food or the container in which the food is put is heated using a radiant wave emitted from the heated radiator to an outside. 
       SUMMARY 
       [0005]    The present disclosure is related to a gas cooker that has an insulating member for preventing heat from being transferred when a burner operates. In addition, the insulating member of the gas cooker prevents a case of the gas cooker from being overheated by combustion heat. 
         [0006]    In general, one innovative aspect of the subject matter described in this specification can be embodied in a gas cooker comprising: a case defining an interior area, the case including an opening to the interior area; a plate covering, fully or in part, the opening of the case; a burner that is located in the interior area of the case, wherein the burner includes a heating element that is heated using gas; a vent that is located at a first position of the case and that is configured to discharge burned gas from the interior area of the case to an exterior of the case; an insulating case that is coupled to the burner and that is configured to hold the burner; and a first insulator that is coupled between the insulating case and the plate and that is configured to seal an interior space of the burner. 
         [0007]    The foregoing and other embodiments can each optionally include one or more of the following features, alone or in combination. In particular, one embodiment includes all the following features in combination. A first end of the first insulator extends to the vent. The first insulator is coupled between the burner and the insulating case. The gas cooker includes a plurality of burners located in the interior area of the case, wherein the first insulator covers areas between the plurality of burners. The first insulator comprises a sheet that is coupled to a circumferential portion of each burner. The first insulator includes: a border portion coupled to a circumferential portion of the insulating case; and a partitioning portion that extends from a first area of the border portion to the vent, wherein the partitioning portion, in part or fully, covers areas between the plurality of burners. The partitioning portion includes one or more branches and is coupled to a circumferential portion of each burner. A second insulator that is coupled between the burner and the insulating case and that is configured to reduce heat transfer from the interior space of the burner to the insulating case. The insulating case includes a burner hole that holds the burner, and wherein the second insulator includes an open area corresponding to the burner hole and covers a surrounding area of the burner hole of the insulating case. A border line of the open area substantially matches to a border line of the burner hole. The burner includes: a burner port configured to provide gas and hold the heating element, a spark plug configured to ignite fire using the provided gas, wherein the heating element is heated by the ignited fire; a burner holder that (i) is configured to hold the spark plug, (ii) is coupled between the burner port and the plate, and (iii) includes a burned gas guide portion that flows burned gas to the vent; and a burner cover that is configured to cover the burned gas guide portion of the burner holder and that is configured to flow burned gas to the vent. The second insulator is coupled to the burned gas guide portion. The gas cooker includes a plurality of burners located inside the insulating case, wherein the second insulator is coupled to each of the plurality of burners and configured to reduce heat transfer from each of the plurality of burners to the insulating case. The first insulator and the second insulator comprise compressible insulating material. The gas cooker includes: a plate bracket that is coupled to the plate and that is configured to hold the first insulator to prevent the first insulator from contacting the case. The first insulator or the second insulator comprises elastically deformable material that is configured to be compressed. The gas cooker includes a fan configured to provide air flow to the vent. The fan is configured to provide air flow to the insulating case. The plate is a metal plate. The plate is a ceramic plate. 
         [0008]    The details of one or more examples of the subject matter described in this specification are set forth in the accompanying drawings and the description below. Other potential features, aspects, and advantages of the subject matter will become apparent from the description, the drawings, and the claim. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a diagram illustrating an example gas cooker. 
           [0010]      FIG. 2  is a diagram illustrating an inside area of an example gas cooker. 
           [0011]      FIG. 3  is a diagram illustrating an inside area of an example gas cooker. 
           [0012]      FIG. 4  is a diagram illustrating an inside area of an example gas cooker. 
           [0013]      FIG. 5  is a diagram illustrating an example burner unit. 
           [0014]      FIG. 6  is a diagram illustrating an example burner unit and an example insulating member. 
           [0015]      FIG. 7  is a diagram illustrating an example cross-sectional view of the example gas cooker of  FIG. 1 . 
           [0016]      FIG. 8  is a diagram illustrating an example burner. 
           [0017]      FIG. 9  is a diagram illustrating an inside area of an example case. 
           [0018]      FIG. 10  is a diagram illustrating an example insulating case. 
           [0019]      FIG. 11  is a diagram illustrating an example cross-sectional view of the example gas cooker of  FIG. 1 . 
           [0020]      FIG. 12  is a diagram illustrating an example air flow inside an example gas cooker. 
           [0021]      FIG. 13  is a diagram illustrating an example gas cooker. 
       
    
    
       [0022]    Like reference numbers and designations in the various drawings indicate like elements. 
       DETAILED DESCRIPTION 
       [0023]      FIG. 1  illustrates an example gas cooker. A gas cooker  1  may be installed at an upper surface of furniture such as a sink. The gas cooker  1  is formed to be seated in an opening formed at an upper surface of the sink, and an exterior thereof exposed through the upper surface of the sink may be formed by a plate  20 . 
         [0024]    And the entire exterior of the gas cooker  1  may be generally configured with a case  10 , the plate  20  and a vent  21 . 
         [0025]    The case  10  may be formed of a plate-shaped steel material, and an upper surface thereof is bent to be opened, and thus a space in which a plurality of elements for operating the gas cooker  1  are accommodated is provided therein. And when the gas cooker  1  is installed at the sink, the case  10  is in an accommodated state inside the opening of the sink. 
         [0026]    The plate  20  forming an upper surface of the gas cooker  1  is provided at the opened upper surface of the case  10 . The plate  20  shields the opening of the sink while the gas cooker  1  is installed at the sink, is exposed through the upper surface, and forms the exterior of the upper surface of the gas cooker  1 . And the plate  20  provides a flat surface on which food to be cooked is seated. 
         [0027]    And the vent  21  through which exhaust gas is discharged is provided at a rear end of the plate  20 . The vent  21  is formed to slightly protrude from the plate  20 , and a plurality of vent holes  211  are opened at the vent  21  so that the exhaust gas is discharged through the vent holes  211 . 
         [0028]      FIGS. 2-4  illustrate an inside area of an example gas cooker. 
         [0029]    A configuration of the gas cooker will be described in detail with reference to the drawings. The upper surface of the gas cooker  1  is formed by the plate  20 , and the other exterior except the upper surface is formed by the case  10 . 
         [0030]    The plate  20  may be formed of a ceramic glass material, and a top frame  22  may be provided at a perimeter of the plate  20 , and may form an exterior of the perimeter of the plate  20 . And a vent seating portion  221  which is opened so that the vent  21  is seated therein may be further formed at the top frame  22 . 
         [0031]    An operation unit  23  may be provided under the plate  20 . The operation unit  23  is operated to control heating power of the gas cooker  1  by a user, and may be formed to be operated by the user&#39;s touching operation. Of course the operation unit  23  may be configured with an electronic switch or a sensor, instead of a touching method. 
         [0032]    An operation part  201  which enables the user to recognize an operating portion of the operation unit  23  may be formed at an upper surface of the plate  20  corresponding to the operation unit  23 . The operation part  201  may be formed at the upper surface of the plate  20  in a printing method or a film attaching method, and may also be formed in a transparent or translucent type so that at least a part of the operation unit  23  is exposed. Also, the operation part  201  may be formed not to be recognized from an outside through the plate  20  before an operation thereof, but to be recognized from the outside by turning on a separate backlight. 
         [0033]    The operation unit  23  may be located at a front end of the plate  20 , and may be formed so that an upper end of the operation unit  23  is in completely close contact with the plate  20 . And the operation unit  23  may also be formed to be coupled to the plate  20  and thus to be disassembled from or assembled to the case  10  in a module state. 
         [0034]    In some implementations, the opened upper surface of the case  10  may be formed to have a somewhat smaller area than that of the plate  20 , and may also be formed to have a structure in which the perimeter of the plate  20  further protrudes to an outside of the case  10  when being coupled to the plate  20 . And an exterior of the case  10  may be formed by bending the steel plate material, and if necessary, may be formed by injection-molding a resin material. 
         [0035]    When the plate  20  and the case  10  are coupled to each other, a space is formed inside the case  10 , and a burner unit  30  may be provided in the space. The burner unit  30  may include a plurality of burners  40  in which combustion of a supplied mixed gas occurs, and an insulating case  31  at which the burners  40  are fixed and installed. 
         [0036]    Each of the burners  40  has a nozzle  33  for supplying the gas, and a mixing tube  34  through which a gas and air are mixed and introduced to a burner port  41  may be provided at an outlet side of the nozzle  33 . The nozzle  33  and the mixing tube  34  may be formed in one module, and may be respectively fixed to and installed at the burner port  41 . 
         [0037]    In some implementations, the plurality of burners  40  may be provided, and may include a first burner  401  and a second burner  402  which are provided at both of left and right sides inside the case  10 , and a third burner  403  which is provided between the first burner  401  and the second burner  402  provided at both of the left and right sides and has a size smaller than each of the first burner  401  and the second burner  402 . 
         [0038]    And all of the first burner  401 , the second burner  402  and the third burner  403  may be seated on the insulating case  31 , and may be installed inside the case  10 . The number of burners  40  and a size of each of the burners  40 , which are installed at the insulating case  31 , are not limited to this example, and can be changed. 
         [0039]    And the burner unit  30  may further include an insulating member. The insulating member may include an upper insulator  71  disposed between the plate  20  and the burner  40 , and a lower insulator  72  disposed between the insulating case  31  and the burner  40 . 
         [0040]    The upper insulator  71  may be accommodated inside the insulating case  31 , and may be disposed along a circumference of each of the plurality of burners  40 . And an upper surface of the upper insulator  71  may be formed to be in close contact with a lower surface of the plate  20 , to press the upper insulator  71  when the plate  20  and the burner unit  30  are assembled, and to be in completely close contact with the plate  20 . At this point, a space above the plurality of burners  40  is independently partitioned by the upper insulator  71 , and thus a burned gas is prevented from being introduced to the adjacent burners  40 . The insulating member will be described below in detail. 
         [0041]    In some implementations, a gas pipe  35  is provided inside the case  10 . The gas pipe  35  is formed to connect a regulator  51  and a valve unit  52  with the burners  40 , and thus to supply a gas to each of the burners  40 . And a main fan  61  and a sub-fan  62  may be provided inside the case  10  to suction external air into the case  10  and to cool an inside of the case  10 . 
         [0042]      FIG. 5  illustrates an example burner unit.  FIG. 6  illustrates an example burner unit and an example insulating member.  FIG. 7  illustrates is an example cross-sectional view of the example gas cooker of  FIG. 1 . 
         [0043]    The burner unit  30  may include the plurality of burners  40 , and the insulating case  31  at which the plurality of burners  40  are seated. The burners  40  may include the first burner  401  and the second burner  402  which are provided at both of the left and right sides, and the third burner  403  which is provided between the first burner  401  and the second burner  402 . At this point, the third burner  403  may be located at a rear side slightly further than the second burner  402 , and may have a size smaller than the first burner  401  and the second burner  402 . 
         [0044]    The insulating case  31  has a shape of which an upper surface is opened to accommodate the burners  40 , and the insulating case  31  may have a structure in which an upper end thereof is in contact with the plate  20  or the upper surface thereof is shielded by the plate  20 . 
         [0045]    And a first burner hole  311 , a second burner hole  312  and a third burner hole  313  at which the first burner  401 , the second burner  402  and the third burner  403  are respectively located are formed at the insulating case  31  so as to be opened. 
         [0046]    And an exhaust port through which exhaust gas generated by the combustion and internal air of the case  10  are discharged is formed at a rear end of the insulating case  31 . The exhaust port may include a central exhaust port  314  formed at a center, and side exhaust ports  315  formed at both sides of the central exhaust port  314 . 
         [0047]    The central exhaust port  314  may be formed to be slightly narrower than an area of each of the side exhaust ports  315 . This is to reduce an amount of high-temperature exhaust gas discharged through the central exhaust port  314  and thus to reduce a temperature of the entire exhaust gas because a distance between the central exhaust port  314  and the third burner  403  is relatively shorter than a distance between the first and second burners  401  and  402  and the side exhaust ports  315 . 
         [0048]    That is, an amount of exhaust gas discharged through the side exhaust ports  315  having a relatively low temperature may be enabled to be greater than that of exhaust gas discharged through the central exhaust port  314 , and thus the temperature of the entire exhaust gas which is mixed and discharged may be reduced. 
         [0049]    In some implementations, the insulating case  31  has a border  316  which is bent upward along a perimeter of the insulating case  31 , and a space for accommodating the burners  40  is formed therein. The insulating case  31  is formed to have a size which accommodates all of the plurality of burners  40 . The insulating case  31  is formed in a module type, and separable from the case  10  or the plate  20 . 
         [0050]    And the border  316  of the insulating case  31  is spaced apart from an outer side of each of the burners  40  while the burners  40  are accommodated therein, and forms a predetermined space. An insulator accommodating space  317  in which the upper insulator  71  is inserted may be formed between the border  316  and the outer side of each of the burners  40 . 
         [0051]    While the upper insulator  71  is installed inside the insulating case  31 , the plate  20  comes in close contact with and presses the upper insulator  71  when the burner unit  30  is installed, and may shield the opened upper surface of the insulating case  31  and the plurality of burners  40  from an upper side thereof. 
         [0052]    The upper insulator  71  may be formed of an elastically deformable material, and may also be formed of a ceramic insulator. Therefore, at least a part of a lower portion of the upper insulator  71  may be press-fitted to the insulator accommodating space  317  formed between the border  316  of the insulating case  31  and an outer surface of each of the burners  40 . And even when the upper insulator  71  is pressed by the plate  20 , the upper insulator  71  may completely seal the space above each of the burners  40  due to an elastic deformation thereof, and thus may prevent the burned gas from being introduced to the adjacent burner  40 . 
         [0053]    In some implementations, a shape of the upper insulator  71  may be changed according to the number and an arrangement of the burners. In some implementations, three burners  40  are provided. 
         [0054]    The upper insulator  71  may include a border portion  711  which is formed along the border  316  of the insulating case  31 , and a partitioning portion  712  which extends along between the first burner  401  and the second burner  402  from a center of the border portion  711 . 
         [0055]    Specifically, the border portion  711  may be formed along the rear end of the insulating case  31 , i.e., the border  316  except an end thereof at which the vent  21  is formed. That is, the border portion  711  may be formed to be accommodated inside the case  31  and to extend along the border  316 . 
         [0056]    And the border portion  711  may extend along a part of an outer surface of each of the first burner  401  and the second burner  402 . That is, the border portion  711  may be formed to fill the insulator accommodating space  317  between the border  316  of the insulating case  31  and the outer surfaces of the first burner  401  and the second burner  402 . 
         [0057]    At this point, a width of the border portion  711  is formed to be the same as or slightly larger than a width of the insulator accommodating space  317 , and formed to be press-fitted into the insulator accommodating space  317  while being elastically deformed. Also, a thickness of the border portion  711  is formed to be thicker than a height from a bottom of the insulating case  31  to the lower surface of the plate  20 , and thus when the plate  20  is installed, the border portion  711  may be pressed while being elastically deformed. 
         [0058]    The partitioning portion  712  may be formed to extend from a middle of the border portion  711  corresponding to between the first burner  401  and the second burner  402  toward the rear end of the insulating case  31 . At this point, the partitioning portion  712  may extend along the outer surfaces of the first burner  401  and the second burner  402 , and may fill a space between the first burner  401  and the second burner  402 , and may be formed to extend while forming a branch portion  712   b  which is branched into both sides along the circumference of the third burner  403 . The partitioning portion  712  may extend to the rear end of the insulating case  31 , and may extend to the same location as a rear end of the border portion  711 . 
         [0059]    A width of the partitioning portion  712  may be formed at a first half portion  712   a  thereof to correspond to or be slightly larger than the space between the first burner  401  and the second burner  402 , and may be formed at the branch portion  712   b  to correspond to or be slightly larger than a space between the first burner  401  and the third burner  403  and between the second burner  402  and the third burner  403 . And a thickness of the partitioning portion  712  may be formed to be the same as that of the border portion  711 . 
         [0060]    In a state in which the upper insulator  71  is installed, both ends of the border portion  711  are located at outer ends of the side exhaust ports  315  of the insulating case  31 , and both ends of the branch portion  712   b  of the partitioning portion  712  are located between the side exhaust ports  315  and the central exhaust port  314 . That is, the side exhaust ports  315  and the central exhaust port  314  may be located at a space between the border portion  711  and the partitioning portion  712 , and the exhaust gas may be discharged to the vent  21  in a state in which each of the exhaust ports is independently partitioned. 
         [0061]    In some implementations, the lower insulator  72  may be provided at an inner side surface of the insulating case  31 . The lower insulator  72  may be formed in one sheet, and may be formed to cover all of lower sides of the plurality of burners  40 . 
         [0062]    The lower insulator  72  may be formed of the same material as that of the upper insulator  71 , and if necessary, may be formed of a separate material of which a thermal insulating property is more excellent than that of the upper insulator  71 . And unlike the upper insulator  71 , the lower insulator  72  may be formed of a material which is not elastically deformed. 
         [0063]    And the lower insulator  72  is seated inside the insulating case  31  to cover a second half portion of the insulating case  31 , i.e., the remaining bottom surface except the first burner hole  311 , the second burner hole  312  and the third burner hole  313 . The lower insulator  72  may be formed to cover an area including at least a portion corresponding to a burned gas guide portion  444  formed at each of the burners  40 . 
         [0064]    And the lower insulator  72  may include a burner side end  721  formed along a part of the circumference of each of the first burner  401 , the second burner  402  and the third burner  403 , and an insulator side end  722  formed from the burner side end  721  along the perimeter of the insulating case  31 . 
         [0065]    Therefore, the burned gas guide portion  444  through which the high-temperature burned gas generated from the first burner  401 , the second burner  402  and the third burner  403  is discharged may be shielded by the lower insulator  72 , and transferring of heat of the burned gas toward a lower side of the insulating case  31  may be minimized by shielding of the burned gas guide portion  444 . 
         [0066]    Hereinafter, a structure of each of the burners  40  will be described in detail. The burners  40  include the first burner  401 , the second burner  402  and the third burner  403 . However, each of the burners  40  is different only in the arrangement and a size thereof, and has the same basic structure. Therefore, hereinafter, a detailed structure of each of the burners  40  will be described based on the second burner  402 . Since the first burner  401  and the second burner  402  have the same structure, detailed description thereof will be omitted. 
         [0067]      FIG. 8  illustrates an example burner. 
         [0068]    As illustrated in the drawings, the burner  40  may include the burner port  41  to which the mixed gas is supplied, a heating element  42  which is seated at the burner port  41  to be heated by the combustion of the mixed gas, and a burner holder  44  and a burner cover  45  which support the burner port  41  and the heating element  42 . 
         [0069]    Specifically, the burner port  41  is formed in a circular shape which is opened upward. And the burner port  41  may include an accommodating portion  411  in which the mixed gas is accommodated, and a flange portion  412  which is bent outward from an end of the accommodating portion  411 . 
         [0070]    A tube insertion hole  411   a  in which the mixing tube  34  is inserted is opened at one side of an outer portion of the accommodating portion  411 . The mixing tube  34  is inserted and installed into the burner port  41 , and while the mixing tube  34  is installed, an inlet port of the mixing tube  34  protrudes to an outside of the accommodating portion  411 , and an outlet port of the mixing tube  34  is located at a predetermined location inside the accommodating portion  411 . 
         [0071]    In some implementations, the mixing tube  34  may include a plurality of extension tubes  341  which are disposed to be spaced apart from each other, and a tube holder  342  which connects the extension tubes  341  and is fixed to and installed at the tube insertion hole  411   a . Each of the extension tubes  341  extends from an outside of the burner port  41  toward an inside thereof, and outlet ports of the extension tubes  341  are located in the same depth inside the burner port  41 . 
         [0072]    The plurality of extension tubes  341  may be disposed at regular intervals so that the gas supplied through the nozzle  33  is evenly introduced into the burner port  41 . In some implementations, three extension tubes  341  are provided, but two or more extension tubes  341  may be variously provided. 
         [0073]    And a plurality of nozzles  33  through which the mixed gas is injected has a structure which is fixed by a nozzle holder  331 , and an outlet port of each of the nozzles  33  is located at a location corresponding to an inlet port of each of the extension tubes  341 . 
         [0074]    That is, the inlet port of the mixing tube  34  is located at the location corresponding to the outlet port of the nozzle  33  to be spaced apart by a predetermined gap, such that air is mixed together by a pressure difference due to a flow of the gas when the gas is injected through the nozzle  33 . 
         [0075]    In some implementations, a plurality of distribution ribs  413  may be provided inside the accommodating portion  411 . The distribution ribs  413  serve to enable the mixed gas introduced into the accommodating portion  411  to flow in one direction and then to flow again in an opposite direction, and extend upward from a bottom surface of the burner port  41 . The distribution ribs  413  may be molded with the burner port  41 , and may be integrally formed with the burner port  41 . 
         [0076]    At this point, each of the distribution ribs  413  is formed to have a height corresponding to a stepped plate seating portion  411   b  formed at an upper end of the accommodating portion  411 . Therefore, while the heating element  42  is seated on the plate seating portion  411   b , an upper end of each of the distribution ribs  413  is in contact with a lower end of the heating element  42 , and the distribution ribs  413  form a flowing passage of the mixed gas. 
         [0077]    And the distribution ribs  413  may include a first rib  413   a  which extends from an outlet port side of the mixing tube  34  so that an end thereof is spaced apart from a wall surface of the accommodating portion  411 , and a second rib  413   b  which is disposed at a lateral side of the first rib  413   a  and extends from a wall surface facing the outlet port of the mixing tube  34  to the outlet port side of the mixing tube  34 . The first rib  413   a  and the second rib  413   b  are disposed close to each other, and due to the first rib  413   a  and the second rib  413   b , the mixed gas discharged from the mixing tube  34  flows in one direction and then flows again in the opposite direction. 
         [0078]    In some implementations, an ignition rib  414  is formed at one side thereof, which is spaced apart from the outlet port of the mixing tube  34 , to protrude upward. The ignition rib  414  may be formed to extend in a direction crossing a discharging direction of the mixed gas discharged from the outlet port of the mixing tube  34 . 
         [0079]    In some implementations, a distribution plate seating portion  411   c  at which a distribution plate  43  is installed is formed at a perimeter of an inner side surface of the accommodating portion  411 . The distribution plate seating portion  411   c  is formed at an inner wall surface of the accommodating portion  411  facing the mixing tube  34 , and formed to protrude to an inside of the accommodating portion  411 , such that the distribution plate  43  is seated on an upper end thereof. 
         [0080]    At this point, a length of the upper end of the distribution plate seating portion  411   c  may be formed to correspond to that of a curved portion  431  of the distribution plate  43 . And a height of the distribution plate seating portion  411   c  is formed lower than that of the plate seating portion  411   b  so that an upper surface of the distribution plate  43  does not interfere with the heating element  42  while the distribution plate  43  is seated on the distribution plate seating portion  411   c.    
         [0081]    The distribution plate  43  is formed in a semi-circular plate shape to shield a part of an opened upper surface of the accommodating portion  411 . The curved portion  431  of the distribution plate  43  is formed to have a curvature corresponding to an outer circumference of the accommodating portion  411 . Therefore, the distribution plate  43  may be seated on the distribution plate seating portion  411   c , and may shield the opened upper surface of the accommodating portion  411 . And a straight portion  432  is located at a location facing the mixing tube  34 . The straight portion  432  is located at a front side further than an end of the first rib  413   a , i.e., a side of the mixing tube  34 . 
         [0082]    Therefore, the mixed gas introduced through the mixing tube  34  flows through the flowing passage, and then flows again via a lower side of the distribution plate  43  in the opposite direction. At this point, the distribution plate  43  may shield the supplied mixed gas from flowing through an upper side thereof. 
         [0083]    And a plurality of distribution holes  433  may be formed at the distribution plate  43 . The distribution holes  433  is formed from the straight portion  432  of the distribution plate  43  toward the curved portion  431  so that the number thereof is gradually reduced from the straight portion  432  toward the curved portion  431 . That is, a portion of the mixed gas strongly discharged from the mixing tube  34  may come around in the direction opposite to the discharging direction by the distribution plate  43  and the distribution ribs  413 , and another portion thereof may be supplied upward through the distribution holes  433 . 
         [0084]    In some implementations, an installation protrusion  434  protrudes from the curved portion  431  of the distribution plate  43 , and an installation groove  411   d  matched with the installation protrusion  434  is formed at a corresponding portion of the distribution plate seating portion  411   c . Therefore, the distribution plate  43  may be maintained in a stably installed state at the upper end of the accommodating portion  411 . 
         [0085]    The heating element  42  is seated on the plate seating portion  411   b  formed at the upper end of the accommodating portion  411 . The heating element  42  is formed to completely shield the opened upper surface of the accommodating portion  411 . The heating element  42  may be formed of a porous ceramic mat, and the mixed gas flowing upward at the accommodating portion  411  may be burned at the heating element  42 . The heating element  42  may be formed of another material which is usable at the radiant burner  40 . 
         [0086]    The burner port  41  is seated at the burner holder  44 . A burner hole  441  is opened at the burner holder  44 , and the burner port  41  is inserted into the burner hole  441 . At this point, a port seating portion  442  formed to be stepped is formed at a circumference of the burner hole  441 , and the flange portion  412  of the burner port  41  is seated at the port seating portion  442 . And a fastening member passing through the flange portion  412  may be fastened to the port seating portion  442 , and thus the burner port  41  may be fixed to and installed at the burner holder  44 . 
         [0087]    And a plug installing portion  443  is formed at one side of the burner holder  44 . The spark plug  32  is fixed to and installed at the plug installing portion  443 . The spark plug  32  serves to ignite the mixed gas in the burner  40 , is provided above the heating element  42 , and extends from an outside of the heating element  42  toward an inside thereof to ignite the mixed gas. 
         [0088]    Also, a flame detecting unit  321  may be provided at one side of the spark plug  32 . The flame detecting unit  321  serves to check an ignition state of the burner  40  through a change in a voltage or a temperature of the heating element  42 , and may be formed in a module integrally formed with the spark plug  32 , and may extend along with the spark plug  32  from an upper side of the heating element  42  toward the inside of the heating element  42 . 
         [0089]    And the burned gas guide portion  444  formed to extend backward is formed at the burner holder  44 . The burned gas guide portion  444  may extend to a rear end of the case  10  corresponding to a location of the vent  21 . Therefore, the burned gas generated when the combustion occurs at the burner  40  may be guided to the vent  21  along the burner holder  44 , and then may be discharged to an outside. 
         [0090]    At this point, the burned gas guide portion  444  is spaced apart from a rear surface of the case  10 , and a passage P through which the cooling air flows may be formed between a rear surface of the burned gas guide portion  444  and the rear surface of the case  10 . 
         [0091]    And a reheating member  445  extending in a direction crossing a flowing direction of the burned gas is provided on the burned gas guide portion  444 . The reheating member  445  extends to cross the burned gas guide portion  444 , and is formed to extend upward, such that a flow of the burned gas flowing along the burned gas guide portion  444  temporarily stays, and thus the burned gas temporarily stays above the heating element  42 , and thermal efficiency is increased, and initial ignition is easily performed. 
         [0092]    A plurality of cooling holes  446  are formed at a rear end of the burned gas guide portion  444 . The cooling holes  446  are located at positions corresponding to the exhaust ports  314  and  315  so that the cooling air introduced through the exhaust ports  314  and  315  is mixed with the high-temperature burned gas discharged through the burned gas guide portion  444 , and then discharged to the vent  21 . 
         [0093]    The burner cover  45  is provided above the burned gas guide portion  444 . The burner cover  45  forms a flow path of the burned gas flowing through the burned gas guide portion  444 , and shields an opened upper side of the burned gas guide portion  444 . And a rear end of the burner cover  45  is formed to be spaced apart from the rear end of the burned gas guide portion  444 , such that cooling air passed through the cooling holes  446  and the burned gas passing through the burned gas guide portion  444  are mixed and then discharged. 
         [0094]    A holder wall  447  which is bent upward and extends is formed at a rear end of the burner holder  44 , i.e., rear ends of the cooling holes  446 . The holder wall  447  guides the air guided through the burned gas guide portion  444  to flow upward. 
         [0095]    The holder wall  447  is disposed to be spaced apart from the rear end of the burner cover  45  such that the burned gas guided by the burned gas guide portion  444  is mixed with the cooling air introduced through the cooling holes  446 , flows upward, and is discharged through the vent  21 . 
         [0096]      FIG. 9  illustrates an inside area of an example case.  FIG. 10  illustrates an example insulating case. 
         [0097]    As illustrated in the drawings, the main fan  61  and the sub-fan  62  for flowing air in the case  10  may be provided inside the case  10 . Each of the main fan  61  and the sub-fan  62  is formed to have a box fan, and also formed to suction air outside the case  10  and then to discharge the suctioned air from an inside of the case  10 . Of course, a structure of the fan may be employed according to a user&#39;s selection. 
         [0098]    The main fan  61  and the sub-fan  62  enable external air to be introduced to the inside of the case  10  having a sealed structure, and simultaneously enable the air inside the case  10  to forcibly flow and thus to cool the inside of the case  10 . And the air forcibly flowing in the case  10  may be discharged to an outside through the vent  21 . 
         [0099]    The air forcibly flows toward the operation unit  23  by driving of the main fan  61 , and thus may cool a PCB  231  forming the operation unit  23 . Through cooling of the PCB  231 , the operation unit  23  and the operation part  201  of the plate  20  may be cooled so that the user does not feel discomfort due to heat generated when operating the operation part  201  of the plate  20 . 
         [0100]    And by the driving of the main fan  61 , the air outside the case  10  is introduced, and forcibly flows radially centering on the case  10 , and some of the air may flow along perimeters of the first burner  401  and the second burner  402 , and thus heat from the first burner  401  and the second burner  402  does not stay at the inside of the case  10 , but is discharged to the outside. 
         [0101]    Therefore, the internal space of the case  10  may be cooled by the driving of the main fan  61 , and may also protect electronic components in the case  10 , i.e., the PCB  231  and sensors forming the operation unit  23 . 
         [0102]    The sub-fan  62  serves to cool the regulator  51  and the valve unit  52  provided at both of the left and right sides in the case  10 , and is provided at each of the left and right sides of the case  10 . And the sub-fan  62  is provided inside a space partitioned by a barrier  63 , and by the barrier  63 , a space in which the regulator  51  and the valve unit  52  are disposed may be partitioned from the space in which the burner  40  is provided. Therefore, by driving of the sub-fan  62 , the air outside the case  10  may be introduced into the space partitioned by the barrier  63 , and the regulator  51  and the valve unit  52  may be cooled separately from the space in which the burner  40  is disposed. 
         [0103]    And a nozzle bracket  53  for protecting the nozzle  33  and the mixing tube  34  is further provided at the case  10 . The nozzle bracket  53  is fixed to and installed at the bottom surface of the case  10  corresponding to a location at which the nozzle  33  is installed, and also bent to cover an outside of the nozzle  33 . 
         [0104]    Specifically, both of side ends of the nozzle bracket  53  are bent upward, and form a shielding portion  531 , and the shielding portion  531  shields one side of each of the nozzle  33  and the mixing tube  34  including a space between the nozzle  33  and the mixing tube  34 , and thus the air forcibly blown by rotation of the main fan  61  is prevented from being introduced into the space between the nozzle  33  and the mixing tube  34  and having an influence on supplying of the mixed gas. 
         [0105]    As illustrated in the drawings, the regulator  51  which constantly adjusts a pressure of the gas supplied from an outside and the valve unit  52  which selectively supplies the gas supplied from the regulator  51  to the burner port  41  may be provided inside the case  10 . 
         [0106]    The regulator  51  and the valve unit  52  may be disposed at both corners of a rear end inside the case  10  in consideration of an arrangement and a structure of the burner unit  30  provided inside the case  10 . The regulator  51  and the valve unit  52  are located in opposite directions to each other, and formed to be connected to each other by the gas pipe  35  such that the gas is supplied thereto. 
         [0107]    And the sub-fan  62  is provided in front of each of the regulator  51  and the valve unit  52 . The sub-fan  62  which serves to suction the air outside the case  10  into the case  10 , then to blow the air toward the regulator  51  and the valve unit  52 , and thus to cool the regulator  51  and the valve unit  52  may be disposed at the left and right sides of the case  10 . 
         [0108]    The barrier  63  is provided at the left and right sides inside the case  10 . The barrier  63  provides an installing surface of the sub-fan  62 , also enables the air blown by the sub-fan  62  to effectively cool the regulator  51  and the valve unit  52 , and guides the air to be discharged toward the vent  21 . 
         [0109]    Both ends of the barrier  63  are fixed to and installed at a side surface and the rear surface of the case  10 , respectively, and provide a space in which the regulator  51  or the valve unit  52  and the sub-fan  62  are disposed. A space partitioned by the barrier  63  is an outer area of the burner unit  30  which may form a space in the case  10  to be separated from the burner unit  30 . 
         [0110]    Therefore, the air forcibly flowing by an operation of the sub-fan  62  may effectively cool the space in the area partitioned by the barrier  63 . That is, the external air suctioned by the sub-fan  62  is not mixed with the high-temperature air in the space in which the burner unit  30  is disposed, and thus may more effectively cool the regulator  51  and the valve unit  52 . 
         [0111]    The barrier  63  may be fixed to and installed at a lower surface of the insulating case  31 , may connect between the insulating case  31  and the case  10 , and may partition a space. 
         [0112]    A fan seating portion  631  is formed in a right-angled triangular shape, and also formed so that one inclined end thereof is connected to a partitioning portion  632 , and the other end is in close contact with the side surface of the case  10 . Therefore, the barrier  63  may be maintained in a stably fixed state without vibration due to an air flow. 
         [0113]    The partitioning portion  632  is formed to be vertically bent upward from the inclined end of the fan seating portion  631 , and also formed to be fixed to a lower end of the insulating case  31  and to partition the internal space of the case  10 . 
         [0114]    And the partitioning portion  632  extends along the inclined end of the fan seating portion  631 , may further extend outward, and thus may include a first partitioning portion  632   a  which partitions the case  10 , and a second partitioning portion  632   b  which is bent from an end of the first partitioning portion  632   a  and partitions the side exhaust port  315 . 
         [0115]    The first partitioning portion  632   a  is formed to partition a space between the insulating case  31  and the case  10 , and to guide the flow of the air blown by the sub-fan  62 . 
         [0116]    And the second partitioning portion  632   b  is bent from the end of the first partitioning portion  632   a , passes through the side exhaust port  315 , and extends to be in contact with the rear end of the case  10 . Accordingly, by the second partitioning portion  632   b , the side exhaust port  315  may be divided into both of left and right sides based on the second partitioning portion  632   b , and the cooling air flowing along the first partitioning portion  632   a  may be independently discharged through the side exhaust port  315  partitioned by the second partitioning portion  632   b.    
         [0117]    In some implementations, a bent portion  633  which is bent outward may be further formed at an upper end of the first partitioning portion  632   a . The bent portion  633  is in contact with the lower surface of the insulating case  31 . And a fastening member S such as a screw and a bolt may be fastened to the bent portion  633  and the insulating case  31 , and thus the barrier  63  may be fixed and installed. 
         [0118]    Hereinafter, an operation of the gas cooker having such a configuration will be described. 
         [0119]      FIG. 11  illustrates an example cross-sectional view of the example gas cooker of  FIG. 1 .  FIG. 12  illustrates an example air flow inside an example gas cooker. 
         [0120]    As illustrated in the drawings, the user operates the operation part  201  exposed to the plate  20  to use the gas cooker  1 . By operating the operation part  201 , an operating signal may be input through the operation unit  23 . Opening and closing of the valve unit  52  is determined by the operating signal, and thus the gas may be supplied to the desired burner  40 . 
         [0121]    When the gas is mixed with the air, and then supplied to the desired burner  40  in a mixed gas state, the mixed gas is ignited by the spark plug  32 , and the combustion occurs at the heating element  42 , and thus the heating element  42  may be heated. Due to heating of the heating element  42 , the heating element  42  may radiate radiant waves to an outside, and may heat food or a container in which the food is put. 
         [0122]    The user may control heating power of the burner  40  through the operation of the operation part  201 , and may also visually check an ignition state and a heating state through the plate  20  because visible rays are included in the radiant wave generated upon the ignition and the heating of the burner  40 . 
         [0123]    The burned gas generated by the combustion in the burners  40  flows along the burned gas guide portion  444  formed by coupling the burner holder  44  and the burner cover  45 . When the high-temperature burned gas reaches a lower end of the burned gas guide portion  444 , the burned gas may be mixed with the cooling air introduced from a lower side through the cooling holes  446 , and may be discharged to the outside through the vent  21 . 
         [0124]    In some implementations, upon the combustion in the burners  40 , each of the plurality of burners  40  performs the combustion in an independent space partitioned by the upper insulator  71 , and the burned gas is discharged through the burned gas guide portion  444 . Accordingly, when two or more burners  40  are operated, the burned gas from one of the burners  40  may be prevented from being introduced to the other adjacent burner  40  and affecting the combustion. And the burned gas may flow along a space formed by the upper insulator  71 , and may be discharged to the vent  21 . 
         [0125]    Also, the lower insulator  72  may be provided under the burned gas guide portion  444 , may effectively insulate the burned gas guide portion  444  heated while the burned gas flows, and may also minimize heat transferred to an inside of the insulating case  31 . 
         [0126]    In some implementations, the main fan  61  and the sub-fan  62  are driven along with the ignition of the burner  40 . By the driving of the main fan  61 , the air in the case  10  may be suctioned toward the main fan  61 . The suctioned air is discharged radially centering on the main fan  61 . 
         [0127]    Some of the air blown through the main fan  61  flows toward the PCB  231  of the operation unit  23 , and thus the PCB  231  is continuously cooled to be normally operated. 
         [0128]    And a portion of the air blown through the main fan  61  may pass between the first burner  401  and the second burner  402 , and then may be discharged to the central exhaust port  314  along an outer side surface of the third burner  403 . 
         [0129]    And the remaining portion of the air blown through the main fan  61  flows along a space among the first burner  401 , the second burner  402  and the side surface of the case  10 , flows along the barrier  63  which partitions the internal space of the case  10 , and then may be discharged to one side of the side exhaust port  315 . 
         [0130]    As described above, by rotation of the main fan  61 , the air in the case  10  does not stay, but continuously cools the operation unit  23  and the front half portion of the plate  20  at which a cooling unit is located, and the air close to the first burner  401 , the second burner  402  and the third burner  403  is discharged, and thus an internal temperature of the case  10  is prevented from being increased to a preset temperature or more. 
         [0131]    And by the flow of the cooling air discharged through the central exhaust port  314  and the side exhaust port  315 , the burned gas generated upon the combustion in the first burner  401 , the second burner  402  and the third burner  403  may be mixed with the cooling air by a pressure difference, and may be discharged together. At this point, the high-temperature burned gas is mixed with the cooling air discharged from the inside of the case  10 , and is in a low-temperature state, and then may be discharged to the outside through the vent holes  211  of the vent  21 . 
         [0132]    In some implementations, a protruding portion  12  which protrudes forward is formed at the rear surface of the case  10 , and the rear end of the insulating case  31  and the protruding portion  12  are in contact with each other. Therefore, the rear end of the insulating case  31  and the rear surface of the case  10  may be spaced apart from each other, and may form passages separated from each other. 
         [0133]    Therefore, the cooling air blown by the main fan  61  flows backward along the space between the insulating case  31  and the case  10 . And at the rear end of the case  10 , a portion of the cooling air may pass through the central exhaust port  314  and the side exhaust ports  315 , may be mixed with the burned gas in the burner  40 , and then may be discharged through the vent  21 . And another portion of the cooling air may pass through the central exhaust port  314  and the side exhaust ports  315 , may flow to the rear end of the case  10 , may flow through a passage formed by the rear end of the insulating case  31  and the rear surface of the case  10 , and then may be discharged through the vent  21 . 
         [0134]    Therefore, an outer side surface of the case  10  may be cooled by the cooling air, may protect the sink at which the gas cooker  1  is installed or other elements which form an exterior, and may prevent a damage thereof due to heat. 
         [0135]    In some implementations, when the sub-fan  62  is driven, the external air outside the case  10  is introduced into the case  10 , and the internal spaces formed at both sides of the case  10  and partitioned by the barrier  63  may be independently cooled. 
         [0136]    In some implementations, the gas cooker may not be installed at the furniture such as the sink in a built-in method, but may be independently installed at a separate case. 
         [0137]      FIG. 13  illustrates an example gas cooker. 
         [0138]    As illustrated in the drawing, a gas cooker  1  includes the plate  20  and case  10 . In some implementations, the plate  20  and the case  10  may have the same internal or external structure of the plate and the case described in the examples above. 
         [0139]    In some implementations, the gas cooker  1  may be formed to be seated on an outer case  10 ′ which forms an exterior while the plate  20  and the case  10  are assembled. 
         [0140]    In some implementations, instead of the configuration of the case  10 , the plate  20  may be directly installed at the outer case  10 ′, and all of the elements including the burner unit  30  which are disposed in the case  10  may be installed inside the outer case  10 ′.