Patent Publication Number: US-2022228754-A1

Title: Cooking appliance

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2021-0008191, filed on Jan. 20, 2021, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present invention relates to a cooking appliance, and more specifically, to a cooking appliance provided to open or close a cooking chamber of an oven or the like. 
     BACKGROUND 
     A cooking appliance is one of electrical home appliances for cooking food and is installed in a kitchen space to cook food according to user intent. Such cooking appliances may be variously classified according to a heat source or type and a type of fuel. 
     When the cooking appliances are classified according to the type of cooking food, the cooking appliances are classified into open-type cooking appliances and closed-type cooking appliances according to the form of a space in which food is placed. The closed-type cooking appliances may include an oven, a microwave, and the like, and the open-type cooking appliances may include a cooktop, a hob, a griddle, and the like. 
     The closed-type cooking appliance is a cooking appliance in which a space, in which food is positioned, is blocked and the blocked space is heated to cook food. A cooking chamber, which has a space in which the food is placed and is blocked when food is cooked, is provided in the closed-type cooking appliance. The cooking chamber has a space in which the food is actually cooked. 
     The closed-type cooking appliances are mainly classified into a gas oven and an electric oven according to a type of heat source. The gas oven uses gas as fuel and cooks food in a manner of using flame generated when the gas is supplied to a plurality of burners, ignited, and burned. Unlike the gas oven, the electronic oven uses electricity as a heat source and cooks food in a manner of using heat generated by a plurality of heaters when the heaters operate. 
     In the closed-type cooking appliance, a door which selectively opens or closes the cooking chamber may be rotatably provided. The door may be installed on a main body, in which the cooking chamber is formed, to be rotatable by a door hinge provided between the main body and the door and may rotate about a portion coupled to the main body by the door hinge to selectively open or close the cooking chamber. 
     The door is disposed at the open front of the cooking chamber to open or close the cooking chamber, and a gasket may be provided between a front surface of a cavity constituting the cooking chamber and the door. The gasket serves to prevent heat in the cooking chamber from leaking to the outside of the cooking chamber when the cooking chamber is closed. 
     Conventionally, the gasket may be manufactured of a rubber-based material having an elastic restoring force and installed on the front surface of the cavity or the door. The gasket may maintain a sealed state of the cooking chamber using the elastic restoring force when the cooking chamber is closed. 
     In the related art, an oven door packing fixing structure of a gas oven range is disclosed. In the related art, brackets formed of the same material as a packing body are integrally formed to protrude from a plurality of portions at a lower surface of a packing to fix the packing formed of a rubber material to an inner surface of the oven door. 
     In addition, in a packing coupling portion of the oven door, bracket fixing holes having the same shape as the bracket are formed. As the brackets are fixedly inserted into the bracket fixing holes, the packing is fixed. 
     In the related art, the packing body and the bracket are formed of the same material. In this case, the packing body and the bracket should be formed of the same rubber material having an elastic restoring force or the same material having a high hardness. 
     However, when the bracket is formed of the rubber-based material, there is a problem in that the packing is not properly fixed, and when the packing body is formed of a high hardness material, there is a problem in that the cooking chamber is not sealed properly. 
     When considering the above-described content, the packing body, that is, a gasket body, may be formed of the rubber-based material, and the bracket may be separately formed of a material having a high hardness. 
     Generally, the gasket may be molded using a thermoplastic resin in an injection manner. In the gasket, a bracket formed of a metal material for fixing the gasket to the front surface of the cavity or the door may be installed. 
     Conventionally, a gasket and a bracket are molded separately, and the bracket is installed on the gasket in a manner in which the bracket is bonded to the gasket. However, according to such a bracket installation manner, not only a separate process of bonding the bracket to the gasket is added, but also there is a disadvantage of a risk in which the bracket is separated from the gasket due to deformation of a bonded portion when exposed to high temperatures. 
     In order to solve the problems, a process of molding a gasket and a process of installing a bracket may be performed at the same time in an insert-injection manner. For example, a gasket may be molded in an insert-injection manner in which a pre-manufactured bracket is inserted into a thermoplastic resin for molding the gasket, and the gasket and a bracket may be integrally molded through the insert-injection molding manner. 
     As a material of the gasket, a silicone rubber, which has elasticity and high moldability, has been used. However, the gasket formed of a silicone rubber material has a disadvantage in that the gasket is thermally cured and crumbles when exposed to high temperatures. 
     In order to solve the problem of the gasket formed of the silicone rubber, a fluorine rubber material may be applied as a material of the gasket. Since fluorine rubber has higher heat resistance than silicone material, there is a low possibility of the fluorine rubber being cured and crumbling when exposed to high temperatures. 
     However, since the fluorine rubber material has a lower hardness than the silicone rubber material, the fluorine rubber material has a property of being easily torn when compared to the silicone rubber material. In addition, when it is assumed that an overall thickness of the gasket is constant, the thickness of the gasket surrounding the bracket is very small when compared to other portions, and thus there is a high possibility in which the gasket is torn at a peripheral portion of the gasket. 
     That is, when the gasket is molded using the fluorine rubber material, there may be a problem in that a risk of the gasket being torn and the bracket being separated therefrom becomes higher than that of a gasket formed of the silicone rubber material. 
     In addition, the moldability of the fluorine rubber material is not good when compared to the silicone rubber material. That is, when the gasket is molded using the fluorine rubber material, there is a high possibility of the gasket being molded in a state in which the gasket does not properly surround a periphery of the gasket. When the gasket is molded in the state in which the gasket does not properly surround the periphery of the bracket, a possibility of the gasket being torn at a peripheral portion of the bracket is raised, and thus a possibility of the gasket being separated therefrom is raised. 
     RELATED ART 
     Patent Document 
     Korean Patent Publication No. 10-1999-0031387 (Tile of Invention: DOOR PACKING FOR GAS OVEN RANGE) 
     SUMMARY 
     Technical Problems 
     The present invention is directed to providing a cooking appliance including a packing member with an improved structure in which a heat resistance is high and a risk of tearing and separation of a bracket is decreased. 
     Technical Solutions 
     To achieve the objectives, a cooking appliance according to one embodiment of the present invention includes a packing member disposed between a cavity and a door and a fixing member which fixes the packing member to any one of the cavity and the door, wherein the packing member and the fixing member are coupled in the form in which both sides in a front-rear direction of the fixing member inserted into the packing member are surrounded by the packing member. 
     According to one aspect of the present invention, there is provided a cavity in which a cooking chamber is formed, wherein an opening is formed in the front of the cooking chamber, a door disposed on the front of the cavity to open or close the cooking chamber, a packing member disposed between the cavity and the door, and a fixing member which couples the packing member to any one of the cavity and the door, wherein the packing member includes a first packing part formed in a shape surrounding the opening in front of the cavity and a second packing part formed to protrude from the first packing part in a direction toward the door or the cavity, the fixing member includes a first fixing part inserted into the first packing part and a second fixing part connected to the first fixing part to be coupled to any one of the cavity and the door, an insertion portion, into which at least a part of the first fixing part is inserted, is provided in the first packing part, and the insertion portion is formed to be recessed into the first packing part at a position at which both sides in a front-rear direction of the first fixing part inserted into the insertion portion are surrounded by the first packing part. 
     The insertion portion may include a first insertion portion formed to be recessed from one side surface of the first packing part facing the second fixing part in a direction toward an inner portion of the first packing part and a second insertion portion formed to be recessed into the first packing part in a direction different from the direction of the first insertion portion, connected to the first insertion portion, and spaced apart from the one side surface of the first packing part by a predetermined distance. 
     The first insertion portion may be formed to be recessed from a rear surface of the first packing part in the forward direction, and the second insertion portion may be formed to be recessed from a front end portion of the first insertion portion in a direction parallel to the rear surface of the first packing part. 
     The insertion portion may be formed in a shape in which the first insertion portion and the second insertion portion are connected in an “L” shape. 
     The second insertion portion may be disposed in the first packing part to be spaced apart from the one side surface of the first packing part by 0.5 mm or more. 
     At least a part of the second fixing part may be formed in a shape corresponding to a shape of the first insertion portion and connected to the first fixing part in the insertion portion. 
     The first fixing part may be formed to extend from the second fixing part inserted into the first insertion portion in a direction parallel to a direction in which the second insertion portion is recessed. 
     A front surface and a rear surface of the first fixing part inserted into the second insertion portion may be pressed against an inner surface of the first packing part in the first packing part, and the first fixing part may be fixed to the inner portion of the first packing part. 
     In a state in which the first fixing part is inserted into the first packing part, the packing member and the fixing member may be insert-injected so that the packing member and the fixing member are integrally molded. 
     The packing member may be formed of a material having higher heat resistance than silicone rubber. 
     The packing member may be formed of a fluorine rubber material. 
     Advantageous Effects 
     According to a cooking appliance of the present invention, since a packing member is molded using a fluorine rubber resin having a high heat resistance, the packing member, which does not crumble and effectively allows a cooking chamber to maintain a sealed state even when exposed to high temperatures while cooking, can be provided. 
     In addition, since the packing member can be insert-injection molded with a fixing member while surrounding the fixing member with a sufficient thickness, even in a high temperatures state, the sealed state of the cooking chamber can be effectively maintained, and a risk of the packing member being torn and a bracket being consequently separated therefrom can be reduced significantly. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other objects, features, and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings. 
         FIG. 1  is a front perspective view illustrating a cooking appliance according to one embodiment of the present invention. 
         FIG. 2  is a side cross-sectional view illustrating an inner structure of the cooking appliance illustrated in  FIG. 1 . 
         FIG. 3  is a perspective view illustrating a cavity and a packing member, which are separated, illustrated in  FIG. 1 . 
         FIG. 4  is a rear perspective view illustrating a disassembled state of the cavity and the packing member illustrated in  FIG. 3 . 
         FIG. 5  is an enlarged view illustrating portion V of  FIG. 4 . 
         FIG. 6  is a cross-sectional view taken along line VI-VI of  FIG. 3 . 
         FIG. 7  is a cross-sectional view taken along line VII-VII of  FIG. 3 . 
         FIG. 8  is an enlarged view illustrating portion VIII of  FIG. 7 . 
         FIG. 9  is a cross-sectional view illustrating an inner structure of the packing member illustrated in  FIG. 8 . 
     
    
    
     DETAILED DESCRIPTION 
     The above-described purposes, features, and advantages will be described in detail with reference to the accompanying drawings, and thus the technical spirit of the present invention may be easily executed by those skilled in the art. When it is determined that the detailed descriptions of related well-known technologies unnecessarily obscure the gist of the invention, the detailed descriptions will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same or similar elements are denoted by the same reference numerals in the drawings throughout this specification. 
     Although terms such as first, second, or the like may be used for describing various elements, the elements are not limited to the terms. The terms are only used to distinguish one element from another element, and unless otherwise specifically described, a first element may also be a second element. 
     The present invention is not limited to the embodiments to be disclosed below and may be variously changed and implemented in various different forms. The embodiments are only provided in order to fully explain the present disclosure and fully explain the scope of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments disclosed below and should be understood to not only replace a component of any one embodiment with the component of another embodiment but also include modifications, equivalents, and alternatives that fall within the technical spirit and scope of the present invention. 
     The accompanying drawings are only provided so that the embodiments disclosed in the specification are easily understood, and a technical concept of the present invention is not limited thereto, but it will be understood that the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Components in the drawings may be illustrated in such a way that sizes and thicknesses are exaggerated to be great or small in consideration of convenience of understanding or the like, but the scope of the present invention is not limited thereto 
     The terminologies used in the present specification are for the purpose of describing particular embodiments only and are not intended to be limited to the invention. In addition, the singular forms “a” and “an” include the plural forms as well, unless the context clearly indicates otherwise. It should be understood that the terms “comprises,” “comprising,” “includes,” and/or “including” used in the specification specify the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof. That is, it should be understood that the terms “comprises,” “comprising,” “includes,” and/or “including” used in the specification do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Although the terms “first,” “second,” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used for distinguishing one element from another. 
     When an element is referred to as being “connected” or “coupled” to another element, it will be understood that the element can be directly connected or coupled to another element, or other elements may be present therebetween. In contrast, when an element is referred to as being “directly connected” or “directly coupled” to another element, it will be understood that there are no intervening elements. 
     When a certain component is described as being present on or under another component, it will be understood that the element may be directly disposed on or under another element, or other elements may be present therebetween. 
     Unless otherwise defined, all terms including technical and scientific terms used herein have meanings which are the same as meanings generally understood by those skilled in the art. Terms, such as those defined in commonly used dictionaries, should be interpreted as having meanings that are consistent with their meanings in the contexts of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined here. 
     In a state in which a cooking appliance is placed on a floor, a direction in which a door is installed with respect to a center of the cooking appliance is defined as a forward direction. Accordingly, a direction in which food enters an inner portion of the cooking appliance after the door is opened is a rearward direction. For the sake of convenience, a direction toward the forward direction or the rearward direction may be referred to as a first direction. Then, the forward direction may be referred to as one direction of the first direction, and the rearward direction may be referred to as the other direction of the first direction. 
     In addition, a gravity direction may be defined as a downward direction, and a direction opposite to the gravity direction may be defined as an upward direction. 
     In addition, a transverse direction perpendicular to the front-rear direction of the cooking appliance, that is, a width direction of the cooking appliance when the cooking appliance is viewed in front of the door, may be referred to as a left-right direction. For the sake of convenience, the left-right direction may be referred to as a second direction. Then, the rightward direction may be referred to as one direction of the second direction, and the leftward direction may be referred to as the other direction of the second direction. 
     In addition, the width direction of the cooking appliance may be referred to as a lateral direction. Then, the rightward direction may be referred to as one direction of the lateral direction, and the leftward direction may be referred to as the other direction of the lateral direction. 
     In addition, the above-described upward and downward directions may be referred to as a third direction. Then the upward direction may be referred to as one direction of the third direction, and the downward direction may be referred to as the other direction of the third direction. 
     In addition, the above-described upward and downward directions may be referred to as a vertical direction. Then, a front-rear direction and a left-right direction, that is, the first direction and the second direction, may be referred to as a horizontal direction. 
     Throughout the specification, unless otherwise specifically described, “A and/or B” refers to “A, B, or A and B,” and “C to D” refers to “more than or equal to C and less than or equal to D.” 
     [Overall Structure of Cooking Appliance] 
       FIG. 1  is a front perspective view illustrating a cooking appliance according to one embodiment of the present invention. 
       FIG. 2  is a side cross-sectional view illustrating an inner structure of the cooking appliance illustrated in  FIG. 1 . 
     Referring to  FIGS. 1 and 2 , the cooking appliance according to one embodiment of the present invention may include a cook top part  20  and an oven part  30 . 
     An exterior of the cooking appliance  1  may be formed by a main body  10 . The main body  10  may be formed in a form including a substantially rectangular hexahedron shape and formed of a material having a predetermined strength in order to protect a plurality of components installed in an inner space thereof. 
     The main body  10  may include a case  11  constituting a frame of the main body  10  and defining a cavity and a front panel  13  which is disposed on the front of the case  11  and constitutes a front surface of the main body  10 . A cooking chamber  31  may be formed in the case  11 , and an opening, which opens the cooking chamber  31  in the forward direction, may be formed in the front panel  13 . 
     The cook top part  20  may be disposed on the main body  10 . The cook top part  20  may be provided to heat food or heat a container containing food placed in an open space, that is, on an upper side thereof, so as to cook food. A top plate  21 , which constitutes an exterior of an upper surface of the cook top part  20  and closes an upper end of the main body  10 , may be provided on the cook top part  20 . 
     One or more cooktop heating parts  22  for heating food contained in containers may be disposed on the cook top part  20 . 
     As an example, the cooktop heating part  22  may be provided as a heating apparatus using gas fuel. As another example, the cooktop heating part may be provided as a heater or induction heating part using electricity. As described above, a structure of the cooktop heating part  22  may be changed according to a type of heat source. 
     In addition, the oven part  30  may be disposed under the cook top part  20 . The cooking chamber  31 , which provides a space in which food is cooked, may be provided in an inner space of the oven part  30 . 
     The case  11  may be formed in a hexahedron shape having an open front surface, and the cooking chamber  31  may be formed in the case  11 . That is, the cooking chamber  31  may be formed in a substantially hexahedron shape disposed in the case  11  and may be formed to have a space that is open forward. 
     In a state in which the cooking chamber  31  is sealed, while an inner portion of the cooking chamber  31  is heated, food may be cooked. That is, in the oven part  30 , the cooking chamber  31  has a space in which the food is actually cooked. 
     A heating part, which heats the cooking chamber  31 , may be provided in the cooking appliance. The heating part may be provided as a heating apparatus using gas fuel. As another example, the cooktop heating part may be provided as a heater using electricity. As described above, a structure of the heating part may be changed according to a type of used heat source. 
     In the present embodiment, the heating part is illustrated as being provided as the heating apparatus using the gas fuel. Then, a broil burner  35 , which heats the inner space of the cooking chamber  31  from above, may be provided at an upper side of the cooking chamber  31 , and a baker burner type burner, which heats the inner space of the cooking chamber  31  from below, may be further provided at a lower side of the cooking chamber  31 . 
     In addition, a convection part  37 , which moves hot air by convection to heat the inner space of the cooking chamber  31 , may be further provided at a rear side of the cooking chamber  31 . 
     The convection part  37  forcibly moves the air in the inner space of the cooking chamber  31 . That is, the convection part  37  moves the air by suctioning and heating the air in the inner space of the cooking chamber  31  and discharging the heated air to the inner space of the cooking chamber  31  so that the inner space of the cooking chamber  31  is heated, and thus, food positioned in the inner space of the cooking chamber  31  is uniformly heated. 
     A door  32 , which selectively opens or closes the cooking chamber  31 , may be rotatably provided on the oven part  30 . As an example, the door  32  may be provided to open or close the cooking chamber  31  in a pull-down manner in which an upper end of the door  32  is vertically rotated about a lower end thereof. 
     As a whole, the door  32  may be formed in a hexahedron shape having a predetermined thickness. A handle  33  may be disposed on the front of the door  32 . The handle  33  is provided to be gripped when a user wants to rotate the door  32 . The user may easily rotate the door  32  using the handle  33 . 
     A control panel  50  may be provided on a front surface of the cooking appliance, that is, provided in front of an upper portion of the case  11 . The control panel  50  may constitute a part of a front exterior of the cooking appliance. Knobs  51  for adjusting an operation of the cooking appliance, a display  52 , which displays an operation state of the cooking appliance, and the like may be provided on the control panel  50 . 
     For example, the control panel  50  may be formed in a form in which an input part  51  and the display  52  are installed on a control panel cover  50   a  disposed above the door  32  and disposed in front of the cook top part  20 . 
     A plurality of operation switches are provided on the input part  51 , and the user may directly input an operation signal through the operation switch. In this case, the operation switch may also be provided as a knob type which allows a rotating operation or provided as a button or panel type which allows a pressing operation or touch operation. 
     In addition, the display  52 , which provides operation information of the cooking appliance, food cooking information, and the like, may be further provided on the control panel  50 . The user may check various information related to the cooking appliance through the display  52 . 
     As another example, the display  52  may be provided as a touch panel type which allows a touch operation, and thus, the input part  51  and the display  52  may be formed together on one touch panel. 
     Meanwhile, a rear space  34  may be provided behind the cooking chamber  31 . The rear space  34  is disposed behind the case  11  and is a space separated from the cooking chamber  31  by a division surface  30   a  which divides the cooking chamber  31  and the rear space  34  in the front-rear direction. A front boundary surface of the rear space  34  may be defined by the division surface  30   a,  and a rear boundary of the rear space  34  may be defined by a rear cover  15  disposed behind the case  11 . 
     An upper space  40  may be provided outside the case  11 . The upper space  40  may be disposed above the case  11  and behind the control panel  50 . A space in which components or electric parts constituting the cooktop heating part  22  are installed may be formed in the upper space  40 . 
     For example, when the cooktop heating part  22  is provided as the heating apparatus using the gas fuel, a burner, which burns gas, a supply pipe for supplying the gas to the burner, a valve for adjusting gas supply to the burner, and the like may be disposed in the upper space  40 . 
     As another example, when the cooktop heating part  22  is provided as the heating apparatus using the electricity, the heater or the induction heating part and various electric parts for driving the heater or the induction heating part may be disposed in the upper space  40 . 
     A front surface of the upper space  40  may be blocked by the front panel  13 . The front panel  13  may be disposed between the case  11  and the door  32 . At least a part of the front panel  13  may be disposed to block the front of the upper space  40 . For example, an upper portion of the front panel  13  disposed on the cooking chamber  31  may block the front surface of the upper space  40 . 
     An air suction port  14  may be provided in the front panel  13 . The air suction port  14  may be formed to pass through the front panel  13  in the front-rear direction. The air suction port  14  may form a path, through which air outside the upper space  40  is introduced into the upper space  40 , in the front panel  13 . 
     [Structure of Packing Member] 
       FIG. 3  is a perspective view illustrating the cavity and a packing member, which are separated, illustrated in  FIG. 1 ,  FIG. 4  is a rear perspective view illustrating a disassembled state of the cavity and the packing member illustrated in  FIG. 3 ,  FIG. 5  is an enlarged view illustrating portion V of  FIG. 4 , and  FIG. 6  is a cross-sectional view taken along line VI-VI of  FIG. 3 ; 
     Referring to  FIGS. 3 to 5 , a packing member  100  may be formed between the case  11  and the door  32 . The case  11  can define a cavity that can include a cooking chamber. The packing member  100  may serve to prevent heat in the cooking chamber from leaking to the outside of the cooking chamber when the door  32  closes the cooking chamber  31 . 
     Specifically, the packing member  100  may be disposed between the front panel  13  and the door  32 . The packing member  100  may be formed in a shape similar to a shape of an edge of the front panel  13  or an edge of the door  32  and may include a first packing part  110  and a second packing part  120 . 
     The packing member  100  may be coupled to the front panel  13  or the door  32 . In the present embodiment, the packing member  100  is illustrated as being coupled to the front panel  13 . Hereinafter, an example case in which the packing member  100  is coupled to the front panel  13  will be described for a structure of the packing member  100 . 
     The first packing part  110  may be provided in a form constituting a frame of the packing member  100 . The first packing part  110  may be formed in a shape surrounding an opening in the front of the case  11 , more specifically, in front of the front panel  13 . 
     The first packing part  110  may be provided in a form including a first packing body part  111  and a first packing connection part  113 . The first packing body part  111  of the first packing part  110  may provide a surface coupled to the front panel  13 . As an example, the first packing body part  111  may be formed in a shape corresponding to a shape of the front panel  13 , for example a “□” shape. 
     The first packing body part  111  may be coupled to be in surface contact with the front panel  13 . Fixing members  150  may be coupled to the first packing body part  111 . 
     The first packing connection part  113  may be formed to protrude from an inner circumferential surface of the first packing body part  111  to be disposed between and connected to the first packing body part  111  and the second packing part  120 . The first packing connection part  113  may obliquely protrude from the inner circumferential surface of the first packing body part  111 . 
     For example, the first packing connection part  113  may be disposed from the inner circumferential surface of the first packing body part  111  in a direction between a centripetal direction and a direction toward the door  32  or between the centripetal direction and a direction toward the case  11 . 
     As an example, the first packing connection part  113  may be formed to protrude from the inner circumferential surface of the first packing body part  111  in the direction between the centripetal direction and the direction toward the case  11 , that is, to protrude in a direction inclined rearward. As another example, the first packing connection part  113  may be formed to protrude from the inner circumferential surface of the first packing body part  111  in the direction between the centripetal direction and the direction toward the door  32 , that is, to protrude in a direction inclined forward. 
     The second packing part  120  may be formed to protrude from the first packing part  110 . The second packing part  120  may be formed to protrude from the first packing part  110 , more specifically, from the first packing connection part  113  in a direction toward the door  32  or the case  11 . 
     For example, the second packing part  120  may be formed to protrude from the first packing part  110  in the direction toward the door  32 , that is, in the forward direction or from the first packing part  110  in the direction toward the case  11 , that is, in the rearward direction. As another example, the second packing part  120  may be formed to protrude from the first packing part  110  in the front-rear direction. 
     In the present embodiment, the second packing part  120  is illustrated as being formed to protrude from the first packing part  110  in the direction toward the case  11 , that is, in the rearward direction. Accordingly, the second packing part  120  may be inserted into the cooking chamber  31  through the opening of the front panel  13 . The second packing part  120  may extend in a direction parallel to an inner wall of the case  11  and may be insertion-coupled to the case  11 . 
     In addition, the packing member  100  may further include a third packing part  130 . The third packing part  130  may be formed to protrude in a direction which is different from the direction in which the second packing part  120  protrudes. For example, when the second packing part  120  protrudes from the first packing part  110  in the direction toward the cavity in the case  11 , the third packing part  130  may be formed to protrude from the first packing part  110  in a direction toward the door  32 , that is, in the forward direction. 
     The packing member  100  may be formed of a rubber-based material having an elastic restoring force. The packing member  100  may be formed of a material having higher heat resistance than silicone rubber. In the present embodiment, the packing member  100  is illustrated as being formed of a fluorine rubber material having higher heat resistance than the silicone rubber. 
     As described above, since the packing member  100  formed of the fluorine rubber material has higher heat resistance than the silicone robber, there is a low risk of the packing member  100  being thermally cured and crumbling when exposed to high temperatures. 
     [Structure of Fixing Member] 
       FIG. 7  is a cross-sectional view taken along line VII-VII of  FIG. 3 , and  FIG. 8  is an enlarged view illustrating portion VIII of  FIG. 7 . 
     As illustrated in  FIGS. 5, 7, and 8 , fixing members  150  may be provided to couple the packing member  100  to any one of the case  11  and the door  32 . In the present embodiment, the fixing member  150  is illustrated as being provided to couple the packing member  100  to the case  11 , more specifically, to the front panel  13 . 
     The plurality of fixing members  150  may be disposed between the packing member  100  and the front panel  13  to guide coupling between the packing member  100  and the front panel  13  at a plurality of positions. In the present embodiment, the fixing members  150  are illustrated as being disposed at corners of the packing member  100 . However, the present invention is not limited thereto, and the number of the packing members  100  and positions thereof may be determined to be different as necessary. 
     Each of the fixing members  150  may be formed of a metal material and may include a first fixing part  160  and a second fixing part  170 . 
     The first fixing part  160  may be inserted into the first packing part  110  to be coupled to the packing member  100 . Specifically, the first fixing part  160  may be inserted into and coupled to the first packing body part  111 . 
     In the present embodiment, each of the corners of the packing member  100  is illustrated as being formed in a round shape. The first fixing part  160  of the fixing member  150  disposed at the corner of the packing member  100  formed in the round shape as described above may be formed in a round shape corresponding to the shape of the corner of the packing member  100 . 
     For example, the first fixing part  160  may be formed in a metal plate shape similar to an eyebrow shape. More specifically, the first fixing part  160  may be provided in the form of a flat surface parallel to a rear surface of the first packing part  110  facing the front panel  13 . 
     The second fixing part  170  may be connected to the first fixing part  160  to be coupled to any one of the case  11  and the door  32 . In the present embodiment, the second fixing part is illustrated as being coupled to the case  11 , more specifically, to the front panel  13 . 
     In the packing member  100 , the second fixing part  170  may be connected to the first fixing part  160  inserted into the packing member  100 . The second fixing part  170  may be formed to protrude from the first fixing part  160  in an outward direction of the packing member  100 , for example, in a rearward direction of the packing member  100 . 
     The second fixing part  170  may be formed to protrude from the first fixing part  160  in a hook shape. For example, the second fixing part  170  may be formed to protrude from the first fixing part  160  in a   shape. 
     [Coupling Structure between Packing Member and Fixing Member and Cavity] 
     In the present embodiment, the fixing members  150  are illustrated as being disposed at the corners of the packing member  100 . Then, the fixing member  150  may be disposed at each of the corners of the packing member  100  formed in a quadrangular shape. 
     Guide holes  13   a  corresponding to the fixing members  150  may be provided in the front panel  13 . The guide hole  13   a  may be disposed in each of four corners of the front panel  13  formed in the quadrangular shape. Each of the guide holes  13   a  may be formed to pass through the front panel  13  in the front-rear direction, the fixing member  150  may be inserted into the each of the guide holes  13   a,  and thus, the front panel  13  may be insertion-coupled to the fixing member  150 . 
     The guide hole  13   a  may be formed to have a size greater than a size of the fixing member  150 . For example, a diameter of the guide hole  13   a  may be set to be greater than a thickness of the first fixing part  160  or a thickness of the second fixing part  170 . 
     Since the size of the fixing member  150  and the diameter of the guide hole  13   a  are set as described above, the fixing member  150  may be very easily inserted into the guide hole  13   a.  Although the fixing member  150  may not be firmly fixed to the front panel  13 , the fixing member  150  may be very easily hooked on the front panel  13 . 
     The fixing member  150  may serve to guide a coupling position of the packing member  100  and the case  11 , more specifically, the packing member  100  and the front panel  13 , and to temporarily fix the packing member  100  at the guided coupling position. 
     Due to the fixing member  150 , an operator may easily hook the packing member  100  on the front panel  13  in a process of assembling the packing member  100 , and the packing member  100  may be easily and rapidly fixed temporarily. 
     In addition, the packing member  100  may further include a coupling protrusion  140 . The coupling protrusion  140  may be provided for coupling between the packing member  100  and the front panel  13 . The coupling protrusion  140  may be formed to protrude rearward from the first packing part  110 . 
     A coupling hole  13   b  corresponding to the coupling protrusion  140  may be provided in the front panel  13 . The coupling hole  13   b  may be formed to pass through the front panel  13  in the front-rear direction. When the coupling protrusion  140  is inserted into the coupling hole  13   b,  the front panel  13  may be insertion-coupled to the coupling protrusion  140 . In addition, due to the insertion-coupling between the front panel  13  and the coupling protrusion  140 , the packing member  100  may be fixed to the front of the front panel  13 . 
     A plurality of coupling protrusions  140  may be provided in a circumferential direction of the packing member  100 , and coupling holes  13   b,  of which the number corresponds to the number of the coupling protrusions  140 , may be disposed in the front panel  13  at positions corresponding to the coupling protrusions  140 . 
     Accordingly, the insertion-coupling between the front panel  13  and the coupling protrusions  140  is performed, and thus, the packing member  100  may be stably fixed to the front of the front panel  13 . 
     The insertion-coupling between the front panel  13  and the coupling protrusions  140  may be guided by the fixing member  150 . That is, the fixing member  150  may temporarily fix the packing member  100  at a position at which the insertion-coupling between the front panel  13  and the coupling protrusion  140  is performed, and in a state in which the packing member  100  is temporarily fixed at the position guided as described above, the insertion-coupling between the front panel  13  and the coupling protrusion  140  may be easily performed. 
     To this end, the coupling hole  13   b  may be disposed at a position facing the coupling protrusion  140  in the front-rear direction when the fixing member  150  is hooked on the front panel  13 . 
     [Coupling Structure between Packing Member and Fixing Member] 
       FIG. 9  is a cross-sectional view illustrating an inner structure of the packing member illustrated in  FIG. 8 . 
     Referring to  FIGS. 7 to 9 , an insertion portion  115  may be formed in the packing member  100 . The insertion portion  115  may be formed in the first packing part  110 , and at least a part of the first fixing part  160  may be inserted into the insertion portion  115 . 
     The insertion portion  115  may be formed to be recessed into the first packing part  110 . The insertion portion  115  may be formed at a position at which both sides in the front-rear direction of the first fixing part  160  inserted into the insertion portion  115  are surrounded by the first packing part  110 . In the present embodiment, the insertion portion  115  is illustrated as including a first insertion portion  116  and a second insertion portion  117 . 
     The first insertion portion  116  may be formed to be recessed from one surface of the first packing part  110  toward the second fixing part  170  in a direction toward an inner portion of the first packing part  110 . More specifically, the first insertion portion  116  may be formed to be recessed from a rear surface of the first packing body part  111  in the forward direction. 
     The second insertion portion  117  may be formed to be recessed in the inner portion of the first packing part  110  in a direction different from the direction of the first insertion portion  116  and connected to the first insertion portion  116 . The second insertion portion  117  may be disposed to be spaced apart from one side surface of the first packing part  110 , more specifically, the rear surface of the first packing body part  111  by a predetermined distance. 
     For example, the second insertion portion  117  is disposed in the first packing part  110  and may be disposed at a position spaced apart from one side surface of the first packing part  110 , more specifically, the rear surface of the first packing body part  111 , by 0.5 mm or more. 
     That is, the second insertion portion  117  may be formed in the first packing part  110  in the form in which a front side and a rear side of the second insertion portion  117  are surrounded by a front surface and the rear surface of the first packing body part  111 . 
     The second insertion portion  117  may be formed to be recessed from a front end portion of the first insertion portion  116  in a direction parallel to the rear surface of the first packing part  110 . For example, the insertion portion  115  may be formed in a form in which the first insertion portion  116  is connected to the second insertion portion  117  in an “L” shape. 
     At least a part of the second fixing part  170  inserted into the insertion portion  115  may be formed in a shape corresponding to a shape of the first insertion portion  116 . The second fixing part  170  formed as described above may be connected to the first fixing part  160  in the insertion portion  115 . In addition, the first fixing part  160  may be formed to extend from the second fixing part  170  inserted into the first insertion portion  116  in a direction parallel to a direction in which the second insertion portion  117  is recessed. 
     The fixing member  150  formed as described above may be coupled to the packing member  100  in the form in which the first fixing part  160  is inserted into the second insertion portion  117  and the second fixing part  170  protrudes outward from the packing member  100  through the first insertion portion  116 . That is, the fixing member  150  is coupled to the packing member  100  in the form in which the first fixing part  160  is insertion-coupled to the second insertion portion  117 , and a part of the fixing member  150 , that is, the second fixing part, may protrude rearward from the packing member  100 . 
     In the first packing part  110 , a front surface and a rear surface of the first fixing part  160  inserted into the second insertion portion  117  may be pressed against an inner surface of the first packing part  110 . As described above, in a state in which the front surface and the rear surface of the first fixing part  160  are pressed against the inner surface of the first packing part  110 , the first fixing part  160  may be fixed to the inner portion of the first packing part  110 . 
     The packing member  100  may be molded using a thermoplastic resin in an injection manner. For example, the packing member  100  may be molded using a fluorine rubber resin in an injection manner. In addition, the fixing member  150  may be formed of a metal material. 
     The packing member  100  and the fixing member  150  may be integrally molded in an insert-injection manner. Then, in a state in which the first fixing part  160  is inserted into the first packing part  110 , the packing member  100  and the fixing member  150  are insert-injected, and thus, the packing member  100  and the fixing member  150  may be integrally molded. 
     When the packing member  100  and the fixing member  150  are integrally molded as described above, in the packing member  100 , a portion into which the fixing member  150  is inserted corresponds to the insertion portion  115 . The second insertion portion  117  of the fixing member  150  is disposed at a position spaced apart from the rear surface of the first packing body part  111  by 0.5 mm or more, and the rear surface of the first fixing part  160  inserted into the second insertion portion  117  is covered with a part of the packing member  100  by a thickness of 0.5 mm or more. 
     That is, in the fixing member  150 , a periphery of the first fixing part  160  which is a portion inserted into the packing member  100  is surrounded by the packing member  100 , and the fixing member  150  and the packing member  100  are coupled in a form in which the packing member  100  surrounds portions of the first fixing part  160  with a thickness of 0.5 mm or more. 
     According to the present embodiment, the packing member  100  may be formed of a fluorine rubber resin, and the fixing member  150  may be formed of a metal material. The packing member  100  formed of the fluorine rubber resin material has a higher heat resistance than a packing member formed of a silicone rubber material. 
     Accordingly, as illustrated in the present embodiment, the packing member  100  formed of the fluorine rubber resin material may not be cured even when exposed to high temperatures and may maintain the elastic restoring force. The packing member  100  may not crumble and may effectively maintain a sealed state of the cooking chamber even when exposed to the high temperatures while cooking. 
     Since a strength of fluorine rubber is lower than a strength of silicone rubber, the fluorine rubber has a property of being easily torn when compared to the silicone rubber. In addition, the fluorine rubber has a lower moldability than the silicone rubber. That is, when the packing member is molded using the fluorine rubber material, there is a possibility in which the packing member may be molded in a state in which the packing member does not properly surround a periphery of the fixing member. 
     By considering this, in the present embodiment, a position of the insertion portion  115  is set so that a position, at which the fixing member  150  is inserted into the packing member  100 , is spaced apart from the rear surface of the packing member  100  by 0.5 mm or more. 
     Accordingly, the second insertion portion  117  is disposed at a position spaced apart from the rear surface of the first packing body part  111  by 0.5 mm or more. As described above, when the position of the second insertion portion  117  is set, although the fluorine rubber has lower moldability than the silicone rubber, the packing member  100  may surround the periphery of the fixing member  150  with a sufficient thickness in an insert-injection process. 
     For example, when the second insertion portion  117  is disposed at a position spaced apart from the rear surface of the first packing body part  111  by only about 0.1 mm, there is a high possibility of insert-injection molding being performed in a state in which the packing member  100  does not properly surround the rear surface of the first fixing part  160 . 
     The reason why the moldability of the fluorine rubber is insufficient is that flowability of the fluorine rubber resin melted for injection is insufficient. As described above, it is not easy to form a thin film having a thickness of 0.1 mm or less with the fluorine rubber resin having the insufficient flowability on the rear surface of the first fixing part  160 . 
     That is, when the second insertion portion  117  is disposed at a position spaced apart from the rear surface of the first packing body part  111  by only about 0.1 mm, due to the property of the fluorine rubber having the insufficient moldability, a possibility of insert-injection molding being performed in a state in which the packing member  100  does not properly cover the rear surface of the first fixing part  160  is raised. 
     In contrast, in the present embodiment, since a position of the insertion portion  115  is set so that a position, at which the fixing member  150  is inserted into the packing member  100 , is disposed to be spaced apart from the rear surface of the packing member  100  by 0.5 mm or more, even when the insert-injection molding is performed using the fluorine rubber resin having insufficient flowability, the packing member  100  may surround the periphery of the fixing member  150  with a sufficient thickness. 
     That is, due to the property of the fluorine rubber resin having the insufficient flowability, even when it is difficult to form a film covering the rear surface of the first fixing part  160  with a thickness of 0.5 mm, inset-injection molding may not be performed at least in a state in which the packing member  100  does not properly cover the rear surface of the first fixing part  160 . 
     In addition, as the position of the insertion portion  115  is set as described above, the film, which covers the rear surface of the first fixing part  160  with the thickness of about 0.5 mm, may be formed. Accordingly, the packing member  100  may be effectively suppressed from being torn at a peripheral portion of the fixing member  150 , and thus, the risk of separation of the fixing member  150  may be significantly lowered. 
     In addition, in a process in which the molded product is separated from a mold after the packing member  100  and the fixing member  150  are integrally molded in the insert-injection manner, a phenomenon, in which the packing member  100  is torn or the fixing member  150  is separated from the packing member  100 , may also be effectively suppressed. 
     In addition, when the fixing member  150  and the packing member  100  are coupled in the form in which the periphery of the fixing member  150  is surrounded by the packing member  100  with the above-described thickness, even when a strength of the fluorine rubber is lower than a strength of the silicone rubber, a possibility of the packing member  100  being torn at the peripheral portion of the fixing member  150  is rather lowered when compared to the packing member formed of the silicone rubber. 
     Since the packing member  100  surrounds the periphery of the fixing member  150  with the thickness much greater than a thickness of a conventional packing member formed of the silicone rubber, an influence of strength degradation due to a material property can be cancelled by an effect of strength improvement due to an increase in thickness, and furthermore, the fixing member  150  and the packing member  100  can be coupled more firmly. 
     While the invention has been described with reference to the embodiments illustrated in the accompanying drawings, the embodiments should be considered in a descriptive sense only, and it should be understood that various alterations and equivalent other embodiments may be made by those skilled in the art. Therefore, the scope of the invention is defined by the appended claims.