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 unit that is located in the interior area of the case, wherein the burner unit includes a heating element that is heated using gas; an operation unit that is located at a first portion of the case and that is configured to control the burner unit based on user input; an exhaust outlet that is located at a second portion of the case; and a first cooling unit that is located in the interior area of the case and that is configured to generate air flow toward the exhaust outlet 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 the Korean Patent Application No. 10-2015-0125176 filed on Sep. 3, 2015 and the Korean Patent Application No. 10-2015-0125169 filed on Sep. 3, 2015, the entire disclosure of each application 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. 
         [0005]    Korean Patent Publication No. 10-2008-0069449 discloses a heating cooker in which an upper surface of a case is shielded by a ceramic plate, and a burner system ignited by supplying a gas is provided at an internal space of the case under the ceramic plate, and heating power is controlled by opening and closing a gas valve through an operation of an operation switch. 
         [0006]    There is a problem that a malfunction may occur when electronic components are provided inside the case because a separate structure for cooling the inside of the case is not provided in the cooker having the above structure. 
         [0007]    Also, since the temperature of exhaust gas discharged after combustion is high, a user may raise emotional complaints, and there is a problem that stability is degraded due to the high temperature exhaust gas. 
       SUMMARY 
       [0008]    The present disclosure is related to a gas cooker that effectively cools electronic components inside a case and improve stability by reducing the discharge temperature of exhaust gas. 
         [0009]    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 unit that is located in the interior area of the case, wherein the burner unit includes a heating element that is heated using gas; an operation unit that is located at a first portion of the case and that is configured to control the burner unit based on user input; an exhaust outlet that is located at a second portion of the case; and a first cooling unit that is located in the interior area of the case and that is configured to generate air flow toward the exhaust outlet. 
         [0010]    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. The operation unit includes: a circuit unit that is coupled with the plate and that includes a touch sensor configured to sense the user input, and wherein the first cooling unit is configured to generate air flow between the circuit unit and a first surface of the case. The gas cooker includes a spark plug configured to ignite fire to provide heat to the heating element; and a valve configured to control an amount of gas that is provided to the burner unit, wherein the circuit unit includes: a first circuit unit that includes the touch sensor, and a second circuit unit that is configured to control the first cooling unit, the spark plug, and the valve, and wherein the first cooling unit is configured to provide air flow between the first circuit unit and the second circuit unit. The burner unit includes: a burner port configured to hold the heating element, a mixing tube coupled to the burner port, a nozzle configured to provide gas to the mixing tube, and a blocking member configured to block air flow that is provided from the first cooling unit. The burner unit includes a first burner located at a first position inside the case, and a second burner located at a second position inside the case, wherein the first cooling unit is located at a third position, inside the case, that is a position between the operation unit, the first burner, and the second burner. The burner unit includes: a plurality of burners, and an insulating case that defines a first interior area, the insulating case including a first opening to the first interior area, the first opening being, fully or partly, covered by the plate, a plurality of second openings that hold the plurality of burners, and a concaved portion that is coupled with the first cooling unit, wherein the first cooling unit is configured to generate air flow to the plate through the concaved portion of the insulating case. The case includes: a first cooling unit installing portion that is coupled to the first cooling unit and that includes one or more openings that allow air to flow into the interior area from an exterior of the case. The gas cooker includes: a bracket that is coupled between the first cooling unit and the concaved portion of the insulating case. The bracket includes: a coupling portion that is coupled to the concaved portion of the insulating case, and a fixing portion that is coupled to the first cooling unit and that enables coupling of the first cooling unit to the first cooling unit installing portion of the case. The insulating case is located in the interior area of the case and isolated from a first surface of the case and a second surface of the case, and wherein the first cooling unit is configured to generate air flow between the insulating case and the case. The insulating case includes an exhaust opening that is located on a first surface of the insulating case and that allows air to flow from the first cooling unit to pass through the exhaust opening. 
         [0011]    In general, one innovative aspect of the subject matter described in this specification can be embodied in a gas cooker including 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 unit that is located in the interior area of the case, wherein the burner unit includes a heating element that is heated using gas; an operation unit that is located at a first portion of the case and that is configured to control the burner unit based on user input; an exhaust outlet that is located at a second portion of the case; a first barrier that is located in the interior area of the case and that divides the interior area into a first area and a second area; a first cooling unit that is located in the first area of the interior area and that is configured to generate air flow toward the exhaust outlet through the first area; and a second cooling unit that is located in the second area of the interior area and that is configured to generate air flow toward the exhaust outlet through the second area. 
         [0012]    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. The gas cooker includes: a second barrier that is located in the first area of the interior area and that divides the first area into a third area and a fourth area, wherein the first cooling unit is located in the third area. The first barrier is coupled to a first surface of the case and a second surface of the case. The burner unit includes an exhaust opening that allows air to flow from the first cooling unit and the second cooling unit toward the exhaust outlet, wherein the first barrier is coupled to a first surface of the burner unit. The burner unit is isolated from a first surface of the case, and wherein air flow from the first cooling unit passes between the burner unit and the case. The gas cooker includes a regulator configured to control gas pressure; and a valve unit configured to control an amount of gas that is provided to the burner unit, wherein the regulator and the valve unit are located in the second area of the interior area. The burner unit includes: a plurality of burners, and an insulating case that includes a plurality of openings that hold the plurality of burners. The first barrier is coupled to a first surface of the insulating case, a first surface of the case, and a second surface of the case. The first barrier includes: a seating portion that holds the second cooling unit; and a partitioning portion that is bent from the seating portion and that divides the interior area into the first area and the second area. 
         [0013]    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 
         [0014]      FIG. 1  is a diagram illustrating an example gas cooker. 
           [0015]      FIG. 2  is a diagram illustrating an inside area of an example gas cooker. 
           [0016]      FIG. 3  is a diagram illustrating an inside area of an example gas cooker. 
           [0017]      FIG. 4  is a diagram illustrating an inside area of an example gas cooker. 
           [0018]      FIG. 5  is a diagram illustrating an inside area of an example gas cooker. 
           [0019]      FIG. 6  is a diagram illustrating an inside area of an example gas cooker. 
           [0020]      FIG. 7  is a diagram illustrating a cross-sectional view of the example gas cooker of  FIG. 1 . 
           [0021]      FIG. 8  is a diagram illustrating a cooling unit and a blocking member of an example gas cooker. 
           [0022]      FIG. 9  is a diagram illustrating a cooling unit and an operation unit of an example gas cooker. 
           [0023]      FIG. 10  is a diagram illustrating a cross-sectional view of an example gas cooker of  FIG. 1 . 
           [0024]      FIG. 11  is a diagram illustrating an example insulating case. 
           [0025]      FIG. 12  is a diagram illustrating an insulating case, a cooling unit, and a barrier of an example gas cooker. 
           [0026]      FIG. 13  is a diagram illustrating an example air flow inside an example gas cooker. 
           [0027]      FIG. 14  is a diagram illustrating an example air flow inside the example gas cooker of  FIG. 1 . 
           [0028]      FIG. 15  is a diagram illustrating an example air flow inside an example gas cooker. 
           [0029]      FIG. 16  is a diagram illustrating an example air flow inside an example gas cooker. 
           [0030]      FIG. 17  is a diagram illustrating an example air flow provided from a cooling unit of an example gas cooker. 
           [0031]      FIG. 18  is a diagram illustrating an example gas cooker. 
       
    
    
     DETAILED DESCRIPTION 
       [0032]      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 top plate  20 . 
         [0033]    And the entire exterior of the gas cooker  1  may be configured with a case  10 , the top plate  20  and an exhaust outlet  21 . 
         [0034]    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. 
         [0035]    The top plate  20  forming an upper surface of the gas cooker  1  is provided at the opened upper surface of the case  10 . The top 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 top plate  20  provides a flat surface on which food to be cooked is seated. 
         [0036]    And the exhaust outlet  21  through which exhaust gas is discharged is provided at a rear end of the top plate  20 . The exhaust outlet  21  is formed to slightly protrude from the top plate  20 , and a plurality of vent holes  211  are opened at the exhaust outlet  21  so that the exhaust gas is discharged through the vent holes  211 . 
         [0037]      FIGS. 2-4  illustrate an inside area of an example gas cooker. 
         [0038]    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 top plate  20 , and the other exterior except the upper surface is formed by the case  10 . 
         [0039]    The top plate  20  may be formed of a ceramic glass material, and a top frame  22  may be provided at a perimeter of the top plate  20 , and may form an exterior of the perimeter of the top plate  20 . And an exhaust outlet seating portion  221  which is opened so that the exhaust outlet  21  is seated therein may be further formed at the top frame  22 . 
         [0040]    An operation unit  23  may be provided under the top 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. In some implementations, the operation unit  23  may be configured with an electronic switch or a sensor, instead of a touching method. 
         [0041]    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 top plate  20  corresponding to the operation unit  23 . The operation part  201  may be formed at the upper surface of the top 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 top plate  20  before an operation thereof, but to be recognized from the outside by turning on a separate backlight. 
         [0042]    The operation unit  23  may be located at a front end of the top plate  20 , and may be formed so that an upper end of the operation unit  23  is in completely close contact with the top plate  20 . And the operation unit  23  may also be formed to be coupled to the top plate  20  and thus to be disassembled from or assembled to the case  10  in a module state. 
         [0043]    In some implementations, the opened upper surface of the case  10  may be formed to have a smaller area than that of the top plate  20 , and may also be formed to have a structure in which the perimeter of the top plate  20  further protrudes to an outside of the case  10  when being coupled to the top 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. 
         [0044]    When the top 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. 
         [0045]    Each of the burners  40  may include a burner port  41  to which the mixed gas is supplied, a red-heat plate  42  which is seated at the burner port  41  to be heated by the combustion of the mixed gas, and a burner holder  43  and a burner cover  44  which support the burner port  41  and red-heat plate  42 . A structure and shape of the burner unit  30  may be applied variously. 
         [0046]    The burner holder  43  and the burner cover  44  are formed to be extended to the rear, and may extend to a rear end of the case  10  corresponding to a location of the exhaust outlet  21 . Therefore, the burned gas generated when the combustion occurs at the burner  40  may be guided to the exhaust outlet  21  by the guidance of the burner holder  43  and the burner cover  44 , and then may be discharged to an outside. 
         [0047]    In some implementations, an insulator for preventing heat of the burner unit  30  from being transferred to the outside of the case  10  or some areas of the top plate  20  may be provided between the burner holder  43  and the top plate  20  and between the burner holder  43  and the insulating case  31 . 
         [0048]    A spark plug  32  for ignition of the mixed gas may be provided in the burner  40 . The spark plug  32  is provided above the red-heat plate  42 , and extends from an outside of the red-heat plate  42  toward an inside thereof to ignite the mixed gas. 
         [0049]    Also, a flame detecting units  321  may be provided at one side of the spark plug  32 . The flame detecting units  321  serves to check an ignition state of the burner  40  through a change in a voltage or a temperature of the red-heat plate  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 red-heat plate  42  toward the inside of the red-heat plate  42 . 
         [0050]    Each of the burners  40  has a nozzle  33  for supplying the gas, and a mixing tube  34  through which a fuel 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 . 
         [0051]    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 . 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 the example described above, and may be changed. 
         [0052]    In some implementations, a gas pipe  35  is provided inside the case  10 . The gas pipe  35  connects a regulator  51  and a valve unit  52  with the burners  40  so that the gas is supplied to each of the burners  40 . At this point, the regulator  51  and the valve unit  52  which are operated by an electronic control method may be commonly referred to as electronic components. A first cooling unit  61  and a second cooling unit  62  may be located inside the case  10 . The first cooling unit  61  and the second cooling unit  62  generates air flow to cool down an interior area of the case  10 . In some implementations, the first cooling unit  61  and the second cooling unit  61  can be implemented as a fan. The first cooling unit  61  can be a main fan  61  and the second cooling unit can be a sub-fan  62 . 
         [0053]      FIGS. 5-6  illustrate an inside area of an example gas cooker. 
         [0054]    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 . In some implementations, a structure of the fan may be employed according to a user&#39;s selection. 
         [0055]    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 exhaust outlet  21 . 
         [0056]    And the main fan  61  may be provided between the first burner  401  and the second burner  402 , and may be provided among the first burner  401 , the second burner  402  and the operation unit  23 . That is, the main fan  61  is located at a location formed among the operation unit  23 , the first burner  401  and the second burner  402 . 
         [0057]    The air forcibly flows toward the operation unit  23  by driving of the main fan  61 , and thus may cool a circuit unit  231  forming the operation unit  23 . For example, the circuit unit  231  can be implemented as a printed circuit board (“PCB”). In detail, the PCB  231  may be mounted in inside an operation unit case  232  forming an outer appearance of the operation unit  23 , and a case inlet port  234  may be formed to be opened in the operation unit case  232 . The case inlet port  234  may be opened to a position adjacent to the main fan  61 , and it may be configured so that the air blown by the main fan  61  is introduced to the inner side of the operation unit case  232  through the case inlet port  234  and may cool the PCB  231 . 
         [0058]    Through cooling of the PCB  231 , the operation unit  23  and the operation part  201  of the top 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 top plate  20 . 
         [0059]    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. 
         [0060]    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  forming the operation unit  23 . 
         [0061]    The main fan  61  is fixed to and installed at a lower surface of the insulating case  31  by a main fan bracket  64 , and may be disposed between a first burner hole  311  and a second burner hole  312 . And the main fan bracket  64  enables the main fan  61  to be installed to be spaced apart from the insulating case  31 , and may also be formed to extend at a height at which the main fan  61  is in completely close contact with a fan installing portion  11 . 
         [0062]    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. 
         [0063]    In some implementations, the fan installing portion  11  is formed at a bottom surface of the case  10  on which the main fan  61  and the sub-fan  62  are installed. The fan installing portion  11  may be formed to protrude in a shape corresponding to the main fan  61  and the sub-fan  62 , such that the main fan  61  and the sub-fan  62  are seated thereat. 
         [0064]    Since the case  10  has a structure in which the remaining portions except the fan installing portion  11  are sealed, the air introduced into the case  10  may be enabled only through the fan installing portion  11 . 
         [0065]    Therefore, the main fan  61  and the sub-fan  62  may have a structure which is in completely close contact with the case  10 , and the suctioned air may be prevented from leaking through a gap between the case  10  and the main fan  61  or the sub-fan  62 . 
         [0066]    The fan installing portion  11  may be formed to protrude by a foaming when the case  10  is molded, and a grille shape may be formed at an opening of a protruding upper surface of the fan installing portion  11 , and thus a foreign substance is prevented from being introduced while the air is suctioned. 
         [0067]    And a cooling air blocking member  53  for protecting the nozzle  33  and the mixing tube  34  is further provided at the case  10 . The cooling air blocking member  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 . 
         [0068]    Specifically, both of side ends of cooling air blocking member  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. 
         [0069]    And, 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 . 
         [0070]    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. 
         [0071]    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 . 
         [0072]    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 enables the air to be discharged toward the exhaust outlet  21 . 
         [0073]    Both ends of the barrier  63  are coupled to both a side surface and a rear surface of the case  10 . For example, the barrier  62  may be fixed to and installed at a side surface and a 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 . 
         [0074]    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 . 
         [0075]    The barrier  63  may be fixed to and installed at the lower surface of the insulating case  31 , and may connect between the insulating case  31  and the case  10  to partition a space. 
         [0076]      FIG. 7  illustrates a cross-sectional view of the example gas cooker of  FIG. 1 .  FIG. 8  illustrates a cooling unit and a blocking member of an example gas cooker.  FIG. 9  illustrates a cooling unit and an operation unit of an example gas cooker. 
         [0077]    As shown in the  FIGS. 7-9 , the main fan  61  is disposed in a front portion of the case  10 , and is provided at a position adjacent to the operation unit  23 . Therefore, the external air is suctioned by the drive of the main fan  61  and may supply cooling air toward the operation unit  23 . 
         [0078]    The operation unit  23  may be configured with the operation unit case  232  forming an outer shape and mounted to be fixed to the case  10 , and the PCB  231  mounted on the operation unit case  232 . A sensor  233  detecting an operation such as a touch sensor may be mounted in the PCB  231  and may be disposed so as to be in contact with or adjacent to a lower surface of the top plate  20 . The sensor  233  may be configured with a different sensor  233  or device which may detect the operation of the user, not a touch sensor  233 . And the case inlet port  234  through which the air blown by the main fan  61  is introduced may be formed in the operation unit case  232 . 
         [0079]    The PCB  231  may be disposed to be spaced apart from a lower surface of an inner side of the operation unit case  232  for improving the cooling efficiency. Further, the PCB  231  may be configured in multiple stages like  FIG. 7  as necessary, and the PCB  231  may be disposed to be spaced apart in vertical from the inner side of the operation unit case  232 . 
         [0080]    That is, the PCB  231  is in close contact with a rear surface of the top plate  20 , and may be configured with a touch PCB in which a touch sensor is mounted and a main PCB disposed to be spaced apart from a lower portion of the touch PCB and controlling operations of the main fan  61 , the valve unit  52 , the spark plug  32 , and other elements inside the case  10 . Therefore, the air blown by the main fan  61  may effectively cool the PCB  231  disposed to be spaced apart in multiple stages. 
         [0081]    The main fan  61  is positioned to the rear of the operation unit  23  and may be disposed in the position corresponding to a central portion of the operation unit  23 . Therefore, the cooling air blown by the operation of the main fan  61  may be supplied evenly to the entire operation unit  23 . 
         [0082]    In addition, the cooling air supplied from the main fan  61  may be configured to cool both upper and lower surfaces of the PCB  231 . And, when the main fan  61  is positioned more adjacent to the operation unit  23 , it may improve the cooling efficiency of the operation unit  23 . 
         [0083]    In addition, the cooling air blocking member  53  is provided on both side portions of the main PCB  231 . The cooling air blocking member  53  may be provided on the bottom surface of the case  10  corresponding to the position of the nozzle  33 , and may be formed to cover between the nozzle  33  and the mixing tube  34 . 
         [0084]    In detail, the cooling air blocking member  53  bends both side ends thereof upward and forms the shielding portion  531 , the shielding portion  531  shields one sides of the nozzle  33  and the mixing tube  34  including the space between the nozzle  33  and the mixing tube  34  and prevents the air forcibly blown when the main fan  61  rotates from being introduced to the space between the nozzle  33  and the mixing tube  34  and affecting the mixed gas supply. 
         [0085]    To this end, a transverse width of the cooling air blocking member  53  is larger than at least a distance between the nozzle  33  and the mixing tube  34 , and the cooling air blocking member  53  has a structure shielding at least a portion of each of the nozzle  33  and the mixing tube  34  as well as the space between the nozzle  33  and the mixing tube  34  from a side. 
         [0086]    Therefore, the cooling air blown by the operation of the main fan  61  is blocked by the cooling air blocking member  53  and cannot be introduced into the space between the nozzle  33  and the mixing tube  34 , and is branched from the cooling air blocking member  53  and flows along peripheries of the first burner  401  and the second burner  402 . 
         [0087]    Also, an opening portion  316  of the insulating case  31  to be described below is positioned above the main fan  61 , and the cooling air blown by the main fan  61  may directly cool the lower surface of the top plate  20 . 
         [0088]      FIG. 10  illustrates a cross-sectional view of an example gas cooker of  FIG. 1 .  FIG. 11  illustrates an example insulating case.  FIG. 12  illustrates an insulating case, a cooling unit, and a barrier of an example gas cooker. 
         [0089]    As illustrated in  FIGS. 10-12 , the first burner hole  311 , the 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. 
         [0090]    And an exhaust opening 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 opening may include a central exhaust opening  314  formed at a center, and side exhaust openings  315  formed at both sides of the central exhaust opening  314 . 
         [0091]    The central exhaust opening  314  may be formed to be slightly narrower than an area of each of the side exhaust openings  315 . This is to reduce an amount of high-temperature exhaust gas discharged through the central exhaust opening  314  and thus to reduce a temperature of the entire exhaust gas because a distance between the central exhaust opening  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 openings  315 . 
         [0092]    That is, an amount of exhaust gas discharged through the side exhaust openings  315  having a relatively low temperature may be enabled to be greater than that of exhaust gas discharged through the central exhaust opening  314 , and thus the temperature of the entire exhaust gas which is mixed and discharged may be reduced. 
         [0093]    Also, the opening portion  316  may be formed in a front end central portion of the insulating case  31 . The opening portion  316  is positioned vertically above the mounting position of the main fan  61 , and therefore the cooling air blown by the main fan  61  is formed to pass through the opening portion  316  during the operation of the main fan  61 . Thus, the cooling air passing through the opening portion  316  may directly cool the lower surface of the top plate  20 . 
         [0094]    The opening portion  316  may be formed so that is a width thereof is gradually narrowed from the front which is an entrance to the rear. Therefore, the intensive blowing of the cooling air toward the entrance side of the opening portion  316  is possible, and the operation part  201  through which the user is operating and the front portion of the top plate  20  may be intensively cooled. 
         [0095]    And, the main fan  61 , the sub-fan  62  and the barrier  63  may be provided at the lower surface of the insulating case  31 . 
         [0096]    The main fan  61  is fixed to and installed at the lower surface of the insulating case  31  by the main fan bracket  64 , and may be disposed between the first burner hole  311  and the second burner hole  312 . And the main fan bracket  64  enables the main fan  61  to be installed to be spaced apart from the insulating case  31 , and may also be formed to extend at a height at which the main fan  61  is in substantially contact with the fan installing portion  11 . 
         [0097]    And, the main fan bracket  64  may be mounted to the lower surface of the insulating case  31  so as to cross the opening portion  316 . Also, the main fan  61  is mounted to the main fan bracket  64  and may be located vertically under the opening portion  316 . 
         [0098]    The main fan bracket  64  may be configured with a fan fixing portion  641  pressing and fixing the main fan  61  from above the main fan  61  and a fan coupling portion  642  extended upward from the fan fixing portion  641  and coupled to the lower surface of the insulating case  31 . 
         [0099]    The fan fixing portion  641  is formed of a plate which may be in contact along an edge of the main fan  61 , and an opening  641   a  is formed in a center so that the air blown by the main fan  61  may pass through the opening  641   a . And, the main fan  61  and the fan fixing portion  641  may be fastened to each other by a coupling member such as a screw or bolt at the fan fixing portion  641 . 
         [0100]    Also, the fan coupling portion  642  may be configured with a pair of first coupling portions  642   a  extended from a front end of both side surfaces of the fan fixing portion  641  to the right and left sides and a pair of a second coupling portions  642   b  extended from a rear end of the both side surfaces of the fan fixing portion  641  to the rear. 
         [0101]    The first coupling portion  642   a  is extended to a side after extended upward in a predetermined length so as to be mounted to cross the entrance of the opening portion  316  which has a relatively large width. And the second coupling portion  642   b  may be fixed to an outside of the opening portion  316  after extended in the same height with the first coupling portion  642   a  and then extended to the rear. 
         [0102]    And, a height of the fan coupling portion  642  may be formed in a height through which the main fan  61  may press the fan installing portion  11  upon mounting of the main fan  61 . Therefore, when the insulating case  31  is seated in the case  10  while the main fan  61  is mounted on the main fan coupling portion  642 , a lower end of the main fan  61  presses and is in close contact with the fan installing portion  11 , thereby preventing outdoor air leakage. 
         [0103]    And the barrier  63  is fixed to and installed at both of left and right sides of the insulating case  31 . The barrier  63  may be fixed by a welding, or may be fixed to and installed at the insulating case  31  by a separate fastening member S such as a rivet, a bolt and a screw. 
         [0104]    The barrier  63  may generally include a fan seating portion  631  providing a surface on which the sub-fan  62  is seated, and a partitioning portion  632  which partitions the internal space of the case  10 . 
         [0105]    In particular, the fan seating portion  631  is formed in an approximately triangular plate shape, and also formed to be in contact with the upper surface of the fan installing portion  11 . And an opening  631   a  through which the air is introduced and a coupling hole  631   b  to which the fastening member S is fastened are formed at the fan seating portion  631 . The fastening member S passes through the sub-fan  62  and the coupling hole  631   b , and is fastened therein. Therefore, the sub-fan  62  may be fixed to the fan seating portion  631  by fastening the fastening member S, and the barrier  63  installed at the insulating case  31  may be assembled inside the case  10  together with the insulating case  31 . At this point, the sub-fan  62  and the fan seating portion  631  on which the sub-fan  62  is seated may be installed to be in completely close contact with the protruding fan installing portion  11 . 
         [0106]    And the fan seating portion  631  is formed in a right-angled triangular shape, and also formed so that one inclined end thereof is connected to the partitioning portion  632 , and the other end is in close contact with a 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. 
         [0107]    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 . 
         [0108]    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 opening  315 . 
         [0109]    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 . 
         [0110]    And the second partitioning portion  632   b  is bent from the end of the first partitioning portion  632   a , passes through the side exhaust opening  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 opening  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 opening  315  partitioned by the second partitioning portion  632   b.    
         [0111]    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 the 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. 
         [0112]      FIG. 13  illustrates an example air flow inside an example gas cooker.  FIG. 14  illustrates an example air flow inside the example gas cooker of  FIG. 1 .  FIG. 15  illustrates an example air flow inside an example gas cooker. 
         [0113]    As illustrated in the drawing, the user operates the operation part  201  exposed to the top 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 . 
         [0114]    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 red-heat plate  42 , and thus the red-heat plate  42  may be heated. Due to heating of the red-heat plate  42 , the red-heat plate  42  may radiate radiant waves to an outside, and may heat food or a container in which the food is put. 
         [0115]    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 top plate  20  because visible rays are included in the radiant wave generated upon the ignition and the heating of the burner  40 . 
         [0116]    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 . 
         [0117]    Some portion 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. 
         [0118]    Also, another portion of the air blown through the main fan  61  is flowing upward, and may be in direct contact with the lower surface of the top plate  20  through the opening portion  316 . Therefore, intensive cooling of the forward portion of the top plate  20 , particularly a position adjacent to the operation part  201  through which the user is operating may be possible. 
         [0119]    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 opening  314  along an outer side surface of the third burner  403 . 
         [0120]    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 opening  315 . 
         [0121]    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 top 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. 
         [0122]    And by the flow of the cooling air discharged through the central exhaust opening  314  and the side exhaust opening  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 exhaust outlet  21 . 
         [0123]    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. 
         [0124]    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 opening  314  and the side exhaust openings  315 , may be mixed with the burned gas in the burner  40 , and then may be discharged through the exhaust outlet  21 . And another portion of the cooling air may pass through the central exhaust opening  314  and the side exhaust openings  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 exhaust outlet  21 . 
         [0125]    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. 
         [0126]    In some implementations, when the sub-fan  62  is driven, the external air outside the case  10  is introduced into the case  10 , and second spaces S 2  formed at both sides of the case  10  and partitioned by the barrier  63  may be independently cooled. 
         [0127]    Hereinafter, the air flow inside the case  10  by the sub-fan  62  will be described in detail with reference to the drawings. 
         [0128]      FIG. 16  illustrates an example air flow inside an example gas cooker.  FIG. 17  illustrates an example air flow provided from a cooling unit of an example gas cooker. 
         [0129]    As illustrated in the figure, the air outside the case  10  is sucked into the case  10  by the rotation of the sub-fan  62 . The sucked air is discharged radially centering on the sub-fan  62  and forcibly flows from the second space S 2  partitioned by the barrier  63 . 
         [0130]    Some of the air which forcibly flows by the sub-fan  62  cools the regulator  51  while passing through the regulator  51 . The regulator  51  may be cooled by the air which is continuously blown by the sub-fan  62 , and may be cooled by the air introduced from the outside in the space partitioned by the barrier  63 . 
         [0131]    Even when the burner  40  is operated at high temperature in the inside of the case  10 , the pure external air not mixed with the air of a position partitioned from a first space S 1  in which the burner  40  is positioned and adjacent to the burner  40  is supplied to the regulator  51  side after being introduced to the second space S 2 , and thus the regulator  51  may be cooled more effectively. 
         [0132]    In some implementations, another portion of the air forcibly flows by the sub-fan  62  flows along the partitioning portion  632  of the barrier  63 , and may be discharged through the side exhaust opening  315  by the second partitioning portion  632   b.    
         [0133]    At this time, the second partitioning portion  632   b  is formed to be extended to the rear end of the case  10  across the side exhaust opening  315 , and the rear end of the insulating case  31  is formed to be spaced apart from the rear surface of the case  10  by a protruding portion  12  of the rear surface of the case  10 . 
         [0134]    Some of the air flown along the partitioning portion  632  may be discharged through the side exhaust opening  315  while being mixed with the burned gas of the burner  40 , and therefore, the air may lower the temperature of the exhaust gas discharged to the exhaust outlet  21 . 
         [0135]    And, another portion of the air flown along the partitioning portion  632  may pass the side exhaust opening  315  and may be discharged to the exhaust outlet  21  through a flow path P between the insulating case  31  and the rear surface of the case  10 . Therefore, since the outer side surface of the case  10  may be cooled, other configurations forming an exterior or sink in which the gas cooker  1  is mounted can be protected and prevented from being damaged by the heat. 
         [0136]    In some implementations, a structure cooled by the sub-fan  62  is described based on the regulator  51 , but since the cooling structure and operation of the valve unit  52  located at the opposite position is the same except a direction thereof. 
         [0137]    In some implementations, the gas cooker may be independently installed at a separate case. 
         [0138]      FIG. 18  is a perspective view of a gas cooker. 
         [0139]    As illustrated in the drawing, a gas cooker  1  includes the same top plate  20  and case  10  as those in the previous implementations, and an internal structure of the case  10  may also be the same. 
         [0140]    However, the gas cooker  1  may be formed to be seated on an outer case  10 ′ which forms an exterior while the top plate  20  and the case  10  are assembled. 
         [0141]    In some implementations, instead of the configuration of the case  10 , the top 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 ′. 
         [0142]    The internal space of the case may be cooled in three dimensions by the main fan and the sub-fan, and in particular, the electronic components such as the operation unit, the regulator and the valve unit may be cooled. Therefore, there is an advantage that the electronic components may be effectively cooled and the operational stability of the regulator and the valve unit may be ensured through this. 
         [0143]    In particular, since a space in which the regulator and the valve unit are disposed is partitioned with a space of the burner unit by the barrier, the outdoor air may directly cool the regulator and the valve unit without being affected by the heat of the burner unit. Therefore, there is an advantage that the cooling efficiency of the regulator and the valve unit may be improved, and also the operational stability of the regulator and the valve unit may be ensured. 
         [0144]    The overall cooling of the case is possible by the main fan and the sub-fan, in particular, a space between the lower surface of the insulator cover and the case may be sufficiently cooled, the thickness of the case may be reduced, and even if the thickness of the case is small, the thermal stability may be secured by lowering the temperature transferred to the outside. Therefore, the damage of furniture is prevented and the use stability of the user may be secured in the built-in structure through which the gas cooker is mounted on the furniture. 
         [0145]    The cooling air supplied by the main fan and the sub-fan may be discharged through the exhaust outlet, at this time, it is mixed with the high temperature burned gas exhausted from the burner unit through the exhaust outlet, as a whole temperature of the exhaust gas is lowered, and thus there is an advantage that the thermal stability may be obtained and the emotional complaints of the user may be eliminated. 
         [0146]    In addition, since a portion of the cooling air guided by the barrier may be discharged to the outside through the flow path formed between the end of the insulating case and the case, the temperature of the end of the case which is adjacent to the exhaust outlet through which the exhaust gas is discharged may get lower, and the heat transferred to the outside of the gas cooker is reduced so there is an advantage that the thermal stability may be further improved. 
         [0147]    The main fan is positioned on the front portion, and in particular, since it may cool the operation unit at a position adjacent to the operation unit, there is an advantage that the operation unit is not malfunctioned in the high temperature environment and a normal operation may be maintained. 
         [0148]    In particular, by the implementation of a cooling structure by the main fan, an electronic component which is sensitive to heat may be applied to the operation unit in the gas cooker which is employing the high temperature burner structure by heating of gas, and therefore, it is possible to implement an operation method not exposing components to the outside, instead of adopting a mechanical operational knob, thereby enriching the appearance. 
         [0149]    Since a cooling air blown by the main fan may directly cool the top plate through the opening portion of the insulating case, the cooling of the front surface portion of the top plate in which the operation part is positioned is possible, and therefore, the emotional complaints which may be generated upon the user&#39;s touch operation may be relieved. 
         [0150]    The cooling air blocking member which may prevent the cooling air which is forcibly flowed by the main fan from being introduced between the nozzle and the mixing tube is provided. Therefore, even during the cooling action of the inside of the case by the main fan, the gas supply through the nozzle may be made effectively, and there is an advantage that the burner may be prevented from being extinguished or the mixing ratio of the mixed gas may be prevented from being abnormally changed. 
         [0151]    The regulator and the valve unit are provided on the rear end edges of the case and disposed to be separated from the burner unit by the barrier so that the internal space of the case can be used efficiently, and there is an advantage that the entire thickness of the gas cooker may be slimmed through this. 
         [0152]    In addition, since the regulator and the valve unit are disposed at a position less affected by heat and at the same time, the cooling fan may cool the inside of the case, there is an advantage that the use stability may be secured by lowering the temperature transferred to the outside while the gas cooker becomes slim. 
         [0153]    Although implementations have been described with reference to a number of illustrative examples, it should be understood that numerous other modifications and implementations can be implemented by those skilled in the art that will fall within the scope of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.