Abstract:
A cooking appliance includes a cabinet defining an external surface of the cooking appliance, a cavity that is provided in the cabinet and that defines a cooking space, a heater module provided at an upper part of the cabinet, the heater module including an encapsulation part that is configured to pass through the cavity, and a module bracket configured to fix the heater module to the cavity.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2015-0064914, filed on May 8, 2015, which is hereby incorporated by reference as if fully set forth herein. 
       FIELD 
       [0002]    The present disclosure relates to a cooking appliance, particularly to a cooking appliance using a charcoal heater as a broil heater. 
       BACKGROUND 
       [0003]    A cooking appliance is an electric home appliance that is used to cook food by heating. A cooking appliance that includes a cavity or chamber for cooking food is generally called an oven. 
         [0004]    The cavity is a structural element constituting the frame of the cooking appliance. The cavity may define a space in which food is heated using a heater. The cavity is generally manufactured using a steel sheet. In this case, the cavity is generally coated with enamel for easy cleaning. 
         [0005]    A sheathed heater is generally used as a heater for heating food in the cooking space. In addition, a charcoal heater, a halogen heater, a ceramic heater, or a radiation heater may also be used. That is, there are various kinds of heaters that are capable of generating heat using electrical energy, and can be used as the heating source for the cooking appliance. A broil heater is a heater that is used to broil food using direct heat or radiant heat, and a bake heater is a heater that is disposed at the lower part of the cavity to heat the entire cavity. A convection heater is a heater that generates hot air in the cavity and, together with a fan, may improve the uniformity with which food is cooked, and a warming heater is a low-power heater that is used to warm dishes or to keep cooked food warm. 
         [0006]      FIG. 1  is a perspective view showing an example of a double oven having two cavities as a conventional cooking appliance, and  FIG. 2  is an exploded perspective view of the double oven shown in  FIG. 1 . 
         [0007]    In general, as shown in  FIGS. 1 and 2 , a cooking appliance  1  includes a cabinet  10  defining the external appearance of the cooking appliance  1 . Cavities  50  and  55  are provided in the cabinet  10 . One cavity may be provided, or a plurality of cavities may be provided. 
         [0008]    The cabinet  10  may include a side panel  11  and a rear panel  12 . Doors  40  and  45  may be mounted by a hinge to the cabinet  10  or the cavities  50  and  55 . Cooking spaces defined in the cavities  50  and  55  may be opened and closed by opening and closing the doors  40  and  45 . That is, a user may open or close the doors  40  and  45  while holding handles  41  and  46 . The doors  40  and  45  are pull-down doors, which may be pulled downward in a frontward direction in a state in which the handles  41  and  46  are held. 
         [0009]    The cooking appliance may further include a cooktop  20  in addition to the cavities  50  and  55 . The cooktop  20  may be provided at the upper surface of the cooking appliance  1 . The cooktop  20  may define the upper surface of the cooking appliance  1 . 
         [0010]    The cooking appliance  1  may further include a control panel  30 . The user may manipulate the cooking appliance  1  using the control panel  30 . The user may also check a state of operation of the cooking appliance  1  through the control panel  30 . A control panel cover  31  may be provided at the rear of the control panel  30 . Consequently, the rear panel  12  and the control panel cover  31  may define the rear surface of the cooking appliance  1 . 
       SUMMARY 
       [0011]    According to one aspect, a cooking appliance may include a cabinet defining an exterior surface of the cooking appliance, a cavity that is provided in the cabinet and that defines a cooking space, a heater module provided at an upper part of the cabinet, the heater module including an encapsulation part that may be configured to pass through the cavity, and a module bracket configured to fix the heater module to the cavity. 
         [0012]    Implementations according to this aspect may include one or more of the following features. For example, the heater module may include a housing configured to receive a charcoal heater, and where each of the housing, the cavity, and the module bracket have fastening holes that correspond to one another. The housing may be provided with an insertion rib, and each of the cavity and the module bracket may be provided with corresponding insertion holes that are configured to receive the insertion rib. The housing may include an upper housing located at a module location part of the cavity, and a lower housing located under and coupled to the upper housing, the lower housing may include a plurality of holes that are configured to communicate with an interior of the cavity. The heater module may include a U-shaped heater with a glass tube, and where the upper housing and the lower housing may be coupled to each other such that the upper housing and the lower housing contact each other inside a U-shaped structure of the heater. A heater bracket configured to support the heater in an inner space of the housing, where the upper housing is provided with a bracket support unit, and where the heater bracket may be fixed to the bracket support unit. The heater bracket may include a base, a hanger configured to hang the heater, and a connection part provided between the base and the hanger, the hanger being spaced apart from the base. 
         [0013]    The bracket support unit may include a lancing part configured to receive the base, and where the base may be provided with a bead configured to be fitted into the lancing part. The module bracket may include at least two surface contact parts configured to be in surface contact with an outer surface of the cavity. The heater module may include a glass tube, a heater core disposed in the glass tube, the heater core extending to opposite ends of the glass tube, and terminals that may be configured to provide electrical connection and that are provided at opposite ends of the heater core, where an encapsulation part may be provided at each of the opposite ends of the glass tube, each encapsulation part being configured to seal an interior of the glass tube. The module bracket may be provided with one or more heater fixing parts, and where the encapsulation parts may be fixed to the heater fixing parts. 
         [0014]    The glass tube may be configured to prevent contact with the cavity and the module bracket, and where the encapsulation parts may be configured to prevent contact with the cavity. Each encapsulation part may be supported at the module bracket by the one or more heater fixing parts. The one or more heater fixing parts may be bent to surround each encapsulation part. Each of the one or more heater fixing parts may be provided with a slot configured to decrease a sectional area of a bent part. The module bracket may be provided with one or more slits, and where the one or more heater fixing parts may be provided with fixing parts configured to be inserted through the slits. 
         [0015]    According to another aspect, a cooking appliance may include a charcoal heater module with a charcoal heater, and a housing configured to receive the charcoal heater, the housing including a hole configured to allow a portion of the charcoal heater to extend outside the housing for electrical connection, a cavity defining a cooking space, the cavity including a hole configured to allow a portion of the charcoal heater to extend from an inside of the cavity to an outside of the cavity, and a module bracket that may be coupled to the cavity and the housing outside the cavity and that may be configured to fix the housing to the cavity, where the module bracket may be configured to fix the charcoal heater outside the cavity. Implementations according to this aspect may include one or more of the following features. For example, the charcoal heater module may be disposed at an upper part of the cavity, and the charcoal heater is a broil heater. Each of the housing, the cavity, and the module bracket may be provided with heater passage holes, where each of the heater passage holes has an inner diameter greater than an outer diameter of the charcoal heater, and where the charcoal heater extends through the heater passage holes and may be fixed to the module bracket through charcoal heater fixing parts located at the module bracket. The housing may be provided with an insertion rib, and the cavity and the module bracket may be provided with insertion holes configured to receive the insertion rib. 
         [0016]    It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1  is a perspective view showing an example of the external appearance of a general cooking appliance, particularly an oven; 
           [0018]      FIG. 2  is an exploded perspective view of the example cooking appliance shown in  FIG. 1 ; 
           [0019]      FIG. 3  is a perspective view showing an example charcoal heater module; 
           [0020]      FIG. 4  is an exploded perspective view of the example charcoal heater module shown in  FIG. 3 ; 
           [0021]      FIG. 5  is a perspective view of an example heater bracket; 
           [0022]      FIG. 6  is a perspective view showing a state in which the heater bracket shown in  FIG. 5  is fixed to a bracket support unit; 
           [0023]      FIG. 7  is a partial sectional perspective view showing a state in which the charcoal heater module shown in  FIG. 3  is coupled to a cavity; 
           [0024]      FIG. 8  is a perspective view showing a process in which the charcoal heater module shown in  FIG. 3  is temporarily assembled to the cavity; 
           [0025]      FIG. 9  is a perspective view showing a state in which the charcoal heater module shown in  FIG. 3  is temporarily assembled to the cavity; 
           [0026]      FIG. 10  is a partial perspective view showing a process in which a charcoal heater module is fixed to a module bracket; and 
           [0027]      FIG. 11  is a partial perspective view showing a state before the charcoal heater module is fixed to the module bracket and a state after the charcoal heater module is fixed to the module bracket. 
       
    
    
     DETAILED DESCRIPTION 
       [0028]    As illustrated in  FIG. 3 , a charcoal heater module  100  may include housings  110  and  120 . A charcoal heater  130  may be supported in the housings  110  and  120 . A portion of the charcoal heater  130  extends outside the housings  110  and  120  for electrical connection. The housings  110  and  120  may include an upper housing  110  and a lower housing  120 . The upper housing  110  and the lower housing  120  may be coupled to each other in order to receive the charcoal heater  130  therein. 
         [0029]    The upper housing  110  is disposed to face the upper surface of a cavity, and the lower housing  120  is disposed under the upper housing  110  to face the lower surface of the cavity. The charcoal heater module  100  is disposed in the upper part of the cavity, in a state shown in  FIG. 3 , to heat and cook food that is placed in the cavity. The charcoal heater module  100  is mounted in the cavity to serve as a broil heater for cooking food placed under the charcoal heater module  100  by heating. The upper housing  110  serves to reflect light and heat such that the reflected light and heat can be effectively supplied to food through the lower housing  120 . For this reason, the upper housing  110  may be referred to as a reflector. The lower housing  120  is configured to face the food. The heat and light generated by the charcoal heater  130  are supplied to the food through the lower housing  120 . That is, the lower housing  120  is disposed to be very close to the food such that the food is cooked using heat and light. 
         [0030]    The lower housing  120  is provided with a plurality of through holes  123 . The size of each of the through holes  123  and the number of through holes  123  may be increased in order to effectively supply heat and light to the food. However, the size of each of the through holes  123  and the number of through holes  123  may be appropriately set in order to prevent the hand of a user or a container from being introduced into the charcoal heater module  100  through the through holes  123 . 
         [0031]    Each of the through holes  123  may be formed in a long hole shape having a relatively large horizontal length. Each of the through holes  123  may be formed in a long hole shape having a larger length in a direction perpendicular to a direction in which food is introduced and removed. As a result, it is possible to effectively prevent a container or a hand of the user from being introduced into the housings  110  and  120 . 
         [0032]    The charcoal heater  130  may be formed in a U shape. Specifically, the charcoal heater  130  includes a glass tube  140 , and a charcoal heater core  131 , which is disposed in the glass tube  140 , and may generate light and heat. The glass tube  140  may also be formed in a U shape. The charcoal heater core  131 , which is disposed in the glass tube  140 , may further extend to opposite ends of the glass tube  140 . The charcoal heater core  131  is connected to terminals  160  for electrical connection outside the glass tube  140 . 
         [0033]    Encapsulation parts  150  are formed at the opposite ends of the glass tube  140 . The encapsulation parts  150  may be made of a ceramic material. The encapsulation parts  150  encapsulate the opposite ends of the glass tube  140 . That is, the interior of the glass tube  140  may be sealed using the encapsulation parts  150 . 
         [0034]    The encapsulation parts  150  may be very fragile and may be easily damaged by impact or vibration. In some implementations, the encapsulation parts  150  may be easily and safely protected. In addition, the charcoal heater  130  may be safely supported by the encapsulation parts  150 . 
         [0035]    The encapsulation parts  150  are located outside the housings  110  and  120 . The terminals  160  for electrical connection are provided at portions further extending from the encapsulation parts  150 . The terminals  160  may be formed at opposite ends of the charcoal heater  130 . When electrical power is supplied through the terminals  160 , the charcoal heater  130  generates light and heat. 
         [0036]    The glass tube  140  exhibits low resistance to vibration and impact due to the material characteristics thereof As a result, it is very difficult to fix the glass tube  140  in the housings  110  and  120 . For this reason, it is necessary to provide a structure that is capable of safely supporting the charcoal heater  130  in the housings  110  and  120  through the glass tube  140 . In this implementation, a plurality of heater brackets  180  is provided. The charcoal heater  130  may be fixed in the housings  110  and  120  through the heater brackets  180 . 
         [0037]    The upper housing  110  is provided with a plurality of bracket support units  114 , to which the heater brackets  180  are fixed. The charcoal heater  130  may be fixed in the housings  110  and  120  through a plurality of support points. For the U-shaped charcoal heater  130 , the heater brackets  180  may be connected to a left part, a right part, and a curved part connected between the left part and the right part of the charcoal heater  130 .  FIG. 4  shows an example in which three heater brackets  180  and three bracket support units  114  are provided. 
         [0038]    The heater brackets  180  serve to fix the charcoal heater  130  in a state in which the charcoal heater  130  is suspended in a space defined between the housings  110  and  120 . The heater brackets  180  are configured to support the glass tube  140 , which surrounds the charcoal heater  130 , particularly the charcoal heater core  131 , such that the glass tube  140  does not directly contact the housings  110  and  120 . When the housings  110  and  120  are vibrated, the glass tube  140 , is prevented from colliding with the housings  110  and  120 . 
         [0039]    As previously described, the charcoal heater  130  and the glass tube  140  may be formed in a U shape. Consequently, the upper housing  110  and the lower housing  120  may be coupled to each other using a region inside the U-shaped structure. 
         [0040]    Specifically, as shown in  FIGS. 3 and 4 , the upper housing  110  is provided with a recess  111 , and the lower housing  120  is provided with a protrusion  121 . The recess  111  and the protrusion  121  face each other and may be in contact with each other. The recess  111  and the protrusion  121  may have coupling holes  112  and  125 , which correspond to each other. The upper housing  110  and the lower housing  120  may be coupled to each other by inserting screws through the coupling holes  112  and  125 . 
         [0041]    The recess and the protrusion are named on the basis of the charcoal heater module  100  shown in  FIG. 3 . That is, the recess and the protrusion are named on the basis of a state in which the charcoal heater module  100  is actually mounted in the cavity. 
         [0042]    The recess  111  and the protrusion  121  are formed so as not to interfere with the charcoal heater  130 . That is, the recess  111  and the protrusion  121  are formed at the region inside the U-shaped structure. Consequently, the charcoal heater  130  is prevented from interfering with the housings  110  and  120 . In addition, the upper housing  110  and the lower housing  120  may be coupled to each other at the middle portions as well as at the outer edges thereof. As a result, the upper housing  110  and the lower housing  120  may be more securely coupled to each other. 
         [0043]    The lower housing  120  is provided at a portion corresponding to the charcoal heater  130  with a recess  122 . The recess  122  is formed such that the distance between the lower housing  120  and the charcoal heater  130  is increased. In other words, the recess  122  is recessed downward. In the same manner, the recess  122  may be formed in a U shape. Consequently, it is possible to prevent the increase in overall height of the charcoal heater module  100 . In addition, a sufficient gap may be provided between the charcoal heater  130  and the lower housing  120 . 
         [0044]    As previously described, the upper housing  110  serves as a reflector. To this end, the recess  111  is located inside the charcoal heater  130 . By the provision of the recess  111 , it is possible for the upper housing  110  to uniformly supply heat and light to the left and right parts and the front part of the cavity as well as to the portion immediately under the charcoal heater  130 . Consequently, heat and light may be uniformly supplied to food placed under the charcoal heater module  100 . 
         [0045]    As shown in  FIG. 8 , the charcoal heater module  100  is fixed to a cavity  200 . The front and rear parts of the charcoal heater module  100  may be fixed to the cavity  200  such that the charcoal heater module  100  is securely fixed to the cavity  200 . That is, support points may be formed at the front and rear parts of the charcoal heater module  100 . The charcoal heater module  100 , particularly the housings  110  and  120 , may be formed in a rectangular shape. The forward and backward length of the charcoal heater module  100  may be greater than the leftward and rightward length of the charcoal heater module  100 . 
         [0046]    The front part of the charcoal heater module  100  may be fixed to the cavity  200  using screws. Coupling slots and coupling holes  113  and  124  may be formed at the front part of the charcoal heater module  100 .  FIG. 4  shows an example in which the coupling holes  124  are formed at the lower housing  120 , and the coupling slots  113  are formed at the upper housing  110 . The coupling holes  124  correspond to the coupling slots  113  such that screws can be inserted through the coupling holes  124  and the coupling slots  113 . The front part of the charcoal heater module  100  may be fixed to the cavity by inserting the screws through the coupling holes  124  and the coupling slots  113 . The cavity may be provided with coupling holes, which correspond to the coupling slots and coupling holes  113  and  124  of the charcoal heater module  100 . 
         [0047]    As previously described, the upper housing  110  and the lower housing  120  are coupled to each other by inserting screws through the coupling holes  112  and  125 . In order to couple the front part of the charcoal heater module  100  to the cavity, therefore, any one of the upper and lower housings may have coupling slots. In some implementations, both the upper and lower housings may have coupling slots. 
         [0048]    The passage holes  116 , though which the charcoal heater  130 , disposed in the housings  110  and  120 , extends outside the housings  110  and  120 , may be formed at the rear part of the upper housing  110 . The size of the passage holes  116  may be greater than those of the charcoal heater  130  and the glass tube  140 . That is, the charcoal heater  130  and the glass tube  140  may extend through the passage holes  116  without contacting the passage holes  116 . When the housings  110  and  120  are vibrated, interference between the passage holes  116  and the glass tube  140  is prevented. 
         [0049]    At the rear part of the charcoal heater module  100  may be provided a module bracket  170  for fixing the charcoal heater module  100  to the cavity. The module bracket  170  is provided to fix the charcoal heater module  100  shown in  FIG. 3  to the rear part of the cavity. The module bracket  170  may be included in the charcoal heater module  100 , or may be configured separately from the charcoal heater module  100 . 
         [0050]    The module bracket  170  may fix the charcoal heater module  100  in the cavity in a state in which the module bracket  170  is located outside the cavity. That is, the module bracket  170  may be located outside the cavity. The charcoal heater module  100  may be easily fixed to the cavity. 
         [0051]    A module location part  210  is formed in the cavity  200  at the upper side of the cavity  200 . Specifically, the module location part  210  may be a part at which the upper housing  110  is located. The module location part  210  may be a portion of the inner upper surface of the cavity  200 . 
         [0052]    In order to supply electrical power to the charcoal heater  130 , the charcoal heater  130  may extend outside the cavity  200 . The charcoal heater  130 , a portion of the glass tube  140 , and the terminals  160  may extend outside the cavity  200 . The charcoal heater  130 , which is disposed in the cavity  200 , may extend outside the cavity  200 . 
         [0053]    The cavity  200  may be provided with heater passage holes  230 . Specifically, the heater passage holes  230  may be formed at the rear part of the cavity  200 . The size of the heater passage holes  230  may be greater than that of the glass tube  140 . In other words, the sectional area of the heater passage holes  230  may be greater than that of the glass tube  140 . As a result, interference between the heater passage holes  230  and the glass tube  140  may be prevented. Gaps between the heater passage holes  230  and the glass tube  140  may be filled with a sealing member. The sealing member may prevent heat or gas in the cavity from being discharged out of the cavity  200 . The glass tube  140  may be supported in the cavity  200  while being spaced apart from the cavity  200  in a sealed state by the provision of the sealing member. 
         [0054]    In order to more stably fix the charcoal heater module  100  to the cavity  200 , a flange  119  may be formed at the rear part of the charcoal heater module  100 . Specifically, the flange  119  may be formed at the rear part of the upper housing  110 . The flange  119  may be brought into surface contact with the cavity  200 . A flange location part  220  may be formed at the rear part of the cavity  200  such that the flange  119  is brought into surface contact with the flange location part  220 . 
         [0055]    The flange  119  and the flange location part  220  may be formed at an incline. Specifically, the flange  119  and the flange location part  220  may be formed to be inclined downward from the upper part of the cavity  200  in a rearward direction. 
         [0056]      FIGS. 7 and 8  show a state in which the cavity  200  is overturned in order to easily fix the charcoal heater module  100  to the cavity  200 . The charcoal heater module  100  is fixed to the cavity  200  in a state in which the cavity  200  is upside down. 
         [0057]    Specifically, the flange  119  may be provided with an insertion rib  118 , and the flange location part  220  may be provided with an insertion hole  221 , through which the insertion rib  118  is inserted. In addition, the heater passage holes  230 , through which the glass tube  140  extends, may be formed at the flange location part  220 . 
         [0058]    As shown, the flange  119  and the flange location part  220  are gradually inclined upward in a rearward direction in a state in which the cavity  200  is upside down. In a state as shown, the charcoal heater module  100  may be positioned so as to be inclined downward in the rearward direction, and then the rear part of the charcoal heater module  100  may be temporarily assembled to the cavity  200 . 
         [0059]    Specifically, after the glass tube  140  and the insertion rib  118  are inserted through the heater passage holes  230  and the insertion hole  221 , respectively, the entirety of the charcoal heater module  100  may be positioned horizontally. In other words, the entirety of the charcoal heater module  100  may be primarily temporarily assembled to the flange location part  220  in a state of being perpendicular to the flange location part  220 , and then the entirety of the charcoal heater module  100  may be positioned horizontally. That is, the rear part of the charcoal heater module  100  may be temporarily fixed to the flange location part  220 . 
         [0060]    Subsequently, the front part of the charcoal heater module  100  may be primarily temporarily assembled to the cavity  200  by inserting screws through the coupling holes  124  and the coupling slots  113 . That is, the front part of the charcoal heater module  100  is fixed to the cavity  200  by the screws inserted through the coupling holes  124  and the coupling slots  113 , and the rear part of the charcoal heater module  100  is temporarily fixed to the cavity  200  by inserting the insertion rib  118  through the insertion hole  221 . 
         [0061]    As previously described, the glass tube  140  may not contact the heater passage holes  230 . The flange  119  is brought into surface contact with the flange location part  220 , and the insertion rib  118  is inserted through the insertion hole  221  such that the insertion rib  118  is caught in the insertion hole  221 . The front part of the charcoal heater module  100  is fixed to the cavity  200 . When the cavity  200  is overturned afterwards, therefore, the charcoal heater module  100  is prevented from being separated downward since the charcoal heater module  100  is temporarily fixed to the cavity  200 . As a result, primary coupling between the charcoal heater module  100  and the cavity  200  may be completed. 
         [0062]    After the charcoal heater module  100  is temporarily fixed to the cavity  200 , the charcoal heater module  100  may be securely fixed to the cavity  200  through the module bracket  170 . That is, the charcoal heater module  100  may be finally fixed to the cavity  200  through the module bracket  170 . 
         [0063]    The module bracket  170  may be formed to correspond to the external shape of the cavity  200 . Specifically, the module bracket  170  may be formed such that a plurality of surface contact parts of the module bracket  170  is brought into surface contact with the outer surface of the cavity  200 .  FIG. 10  shows an example in which three surface contact parts of the module bracket  170  are brought into surface contact with the outer surface of the cavity  200 . The module bracket  170  may be bent such that a plurality of surface contact parts of the module bracket  170  is brought into surface contact with the outer surface of the cavity  200 . 
         [0064]    First, the module bracket  170  may include a first surface contact part  173  formed to be brought into surface contact with the outer surface of the flange location part  220 . The first surface contact part  173  may be provided with through holes  177 . 
         [0065]    The flange  119  may also be provided with through holes  117 , and the flange location part  220  may also be provided with through holes. One screw may be inserted through each of the through holes  177  of the first surface contact part  173 , a corresponding one of the through holes  117  of the flange  119 , and a corresponding one of the through holes of the flange location part  220 . 
         [0066]      FIG. 10  shows an example in which screws are inserted through four through holes  177  of the first surface contact part  173 . The charcoal heater module  100 , the cavity  200 , and the module bracket  170  may be coupled to one another at the same time by inserting the screws through the through holes thereof. The charcoal heater module  100 , the cavity  200 , and the module bracket  170  may be coupled to one another at a plurality of coupling points. 
         [0067]    As previously described, the insertion rib  118  of the charcoal heater module  100  is inserted through the insertion hole  221  of the cavity  200 . The through holes of the charcoal heater module  100  and the cavity  200  may be aligned through inclined matching between the flange  119  and the flange location part  220 . 
         [0068]    The module bracket  170  may also be provided with an insertion hole  175 , through which the insertion rib  118  is inserted. The insertion rib  118  may be simultaneously inserted through the insertion hole  221  of the cavity  200  and the insertion hole  175  of the module bracket  170 . In addition, the module bracket  170  is brought into surface contact with the outer surface of the cavity  200  such that the module bracket  170  is lined up with the outer surface of the cavity  200 . 
         [0069]    The through holes  177  of the first surface contact part  173 , the through holes  117  of the flange  119 , and the through holes of the flange location part are aligned simultaneously when the insertion rib  118  is successively inserted through the insertion holes  221  and  175 . As a result, it is possible to very easily fix the charcoal heater module  100  to the cavity  200 . 
         [0070]    The first surface contact part  173  may be provided with charcoal heater passage holes  176  in addition to the through holes  177 . The size of the charcoal heater passage holes  176  may be greater than the outer diameter of the glass tube  140  such that the interference between the charcoal heater passage holes  176  and the glass tube  140  is prevented. 
         [0071]    The module bracket  170  may be provided with a second surface contact part  174 , which is bent from the first surface contact part  173 . The second surface contact part  174  may be formed so as to be brought into surface contact with the upper surface of the cavity  200 . The first surface contact part  173  and the second surface contact part  174  are brought into surface contact with the upper surface of the cavity  200 , whereby the module bracket  170  is more securely fixed to the cavity  200 . This means that the charcoal heater module  100  is securely fixed to the cavity  200  by the module bracket  170 . 
         [0072]    The module bracket  170  may be formed by bending, piercing, and incising a single sheet. The module bracket  170  may be formed as a single body using a metal sheet. 
         [0073]    As previously described, the charcoal heater  130  does not interfere with the module housings  110  and  120 , excluding the heater brackets  180 , the cavity  200 , and the module bracket  170 . That is, the charcoal heater  130  extends to the rear of the cavity  200  without contacting the module housings  110  and  120 , the cavity  200 , and the module bracket  170 . 
         [0074]    In addition, as previously described, the encapsulation parts  150  of the charcoal heater  130  may be easily damaged by vibration or impact. For this reason, it is necessary to protect the encapsulation parts  150  from such vibration or impact. 
         [0075]    The module bracket  170  may include charcoal heater fixing parts  172 . The charcoal heater fixing parts  172  may be formed to surround the respective encapsulation parts  150 . The charcoal heater fixing parts  172  may be formed separately from the module bracket  170 . In this implementation, the charcoal heater fixing parts  172  may be integrally formed with the module bracket  170  in order to effectively fix the charcoal heater  130  while reducing the number of parts. 
         [0076]    The module bracket  170  may include a flange  178 , which is located under the encapsulation parts  150  such that the flange  178  is spaced apart from the encapsulation parts  150  by a predetermined distance. The flange  178  may be formed so as to be brought into at least partial surface contact with the outer surface of the cavity  200 . For this reason, the flange  178  may also be referred to as a third surface contact part. 
         [0077]    The flange  178  may be fowled at the rear of the first surface contact part  173 . In addition, the flange  178  may be formed to be parallel to the upper surface of the cavity  200 . As a result, interference between the flange  178  and the encapsulation parts  150  may be prevented. 
         [0078]    The charcoal heater fixing parts  172 , which surround the respective encapsulation parts  150 , may be formed at the flange  178  in a state of being bent from the flange  178 . 
         [0079]    As shown in  FIG. 11 , each charcoal heater fixing part  172  or each encapsulation part support part may include a first bent part a, which is bent upward perpendicularly from the flange  178 , a second bent part b, which is bent from the first bent part a such that the second bent part b is parallel to the flange  178 , and a third bent part c, which is bent downward perpendicularly from the second bent part b. 
         [0080]    Each charcoal heater fixing part  172  may surround a corresponding one of the encapsulation parts  150  such that a corresponding one of the encapsulation parts  150  is located in a space defined by the first bent part a, the second bent part b, and the third bent part c. That is, as shown in  FIG. 11 , each charcoal heater fixing part  172  may surround a corresponding one of the encapsulation parts  150  in a rectangular shape. Some of the bent parts may be bent in advance. That is, as indicated by a dotted line in  FIG. 11 , the first bent part a and the third bent part c may be bent in advance. The second bent part b may be bent by a worker when a corresponding one of the encapsulation parts  150  is finally supported. In order to easily bend the second bent part b, a slot  172   a  may be formed at the second bent part b. The second bent part b may be easily bent by the provision of the slot  172   a.  That is, the worker may push each charcoal heater fixing part  172  using his/her finger without using an additional tool to bend the second bent part b. 
         [0081]    After each charcoal heater fixing part  172  is bent to surround a corresponding one of the encapsulation parts  150 , each charcoal heater fixing part  172  may be continuously maintained in a bent state. That is, each charcoal heater fixing part  172  may continue to surround a corresponding one of the encapsulation parts  150 . A hook  172   c  may be formed at each charcoal heater fixing part  172 . Correspondingly, a hook hole  178   a  may be formed at the flange  178 . As indicated by a solid line in  FIG. 11 , the hook  172   c  is inserted through the hook hole  178   a  after each charcoal heater fixing part  172  surrounds a corresponding one of the encapsulation parts  150 . When the hook  172   c  is twisted by  90  degrees counterclockwise in this state, the hook  172   c  is prevented from coming out of the hook hole  178   a.  Each charcoal heater fixing part  172  continues to surround a corresponding one of the encapsulation parts  150 . A slot  172   b  may be formed in order to easily twist the hook  172   c.    
         [0082]    The encapsulation parts  150  may be fixed to the module bracket  170  in a state in which the encapsulation parts  150  are surrounded by the respective charcoal heater fixing parts  172 . Each charcoal heater fixing part  172  may be provided with curved parts  172   d,  each of which has a shape corresponding to the external shape of a corresponding one of the encapsulation parts  150 . The curved parts  172   d  may be formed at the upper and lower portions of each charcoal heater fixing part  172 . As a result, it is possible to more safely and easily support and protect the encapsulation parts  150 . The curved part formed at the lower portion of each charcoal heater fixing part  172  may be referred to as a heater location part or an encapsulation part location part. 
         [0083]    Hereinafter, a heater bracket  180  and a bracket support unit  114 , to which the heater bracket  180  is fixed, will be described in detail with reference to  FIGS. 5 and 6 . The heater bracket  180  may be mounted to the bracket support unit  114  in a state in which the heater bracket  180  and the bracket support unit  114  are upside down relative to a state shown in  FIGS. 5 and 6 . Therefore, the following description will be given based on a state in which the heater bracket  180  is actually mounted to the bracket support unit  114 . However, the following description may also be given based on a state opposite to the state that is shown. 
         [0084]    The heater bracket  180  includes a base  181 , which is fixed to the bracket support unit  114 . The bracket support unit  114  may be formed at the upper housing  110 . The heater bracket  180  may include an extension  183  extending downward and substantially perpendicularly from the base  181 . The extension  183  may be provided with a hanger  182 . The hanger  182  may be formed in an arc shape. The glass tube  140  may be inserted into the hanger  182 . The heater bracket  180  may be formed by bending a single sheet. The hanger  182  and the extension  183  may be elastically deformed. 
         [0085]    The extension  183  and the hanger  182  may be formed by incising and bending a portion of the central part of the base  181 . Specifically, the base  181  may be fixed to the bracket support unit  114 , whereby the entirety of the heater bracket  180  may be fixed to the upper housing  110 . The bracket support unit  114  may include a lancing part  114   a.  Slots  114   b  may be formed in front of and behind the lancing part  114   a.  The lancing part  114   a  protrudes downward by a predetermined height. A predetermined vertical gap defined by the lancing part  114   a  may be provided at the bracket support unit  114 . 
         [0086]    The base  181  may be inserted through the lancing part  114   a.  The base  181  is provided with beads  184 , which correspond to the vertical gap defined by the lancing part  114   a.  The base  181  may be forcibly fitted into the lancing part  114   a  by the provision of the beads  184 . 
         [0087]    Two slots  114   b  are formed in front of and behind the lancing part  114   a  in a state in which the slots  114   b  are parallel to each other. The lancing part  114   a  is formed between the slots  114   b  in a state in which the lancing part  114   a  is recessed by the predetermined vertical gap. The base  181  is inserted through the lancing part  114   a  from one of the slots  114   b  to the other slot. A bent part  186  is formed at the front part of the base  181 . The bent part may be gradually inclined upward toward the front end of the base  181  (in a direction in which the base  181  is inserted). The base  181  may be inserted through the lancing part  114   a  in a state in which the base  181  is inclined such that the rear part of the base  181  is higher than the front part of the base  181 . When the base  181  is caught in the front slot  114   b,  the bent part  186  may easily slide through the front slot  114   b  such that the bent part  186  passes through the lancing part  114   a.  In this state, the insertion of the base  181  may be stopped. 
         [0088]    In order to prevent the base  181  from moving in a rearward direction or in a lateral direction after the insertion of the base  181  through the lancing part  114   a  is completed, a slit structure  114   c  may be provided. The slit structure  114   c  may be formed so as to be recessed downward by bending a portion of the upper housing  110 . The slit structure  114   c  may be brought into contact with the outer edge of the base  1181  such that the base  181  is securely fixed to the upper housing  110 . 
         [0089]    The base  181  may be provided with a hook  185 . The hook  185  may be formed to be inclined in a direction opposite to the direction in which the base  181  is inserted. The hook  185  may be formed to be inclined toward the rear part of the base  181 . When the base  181  is inserted through the lancing part  114   a,  therefore, interference between the base  181  and the lancing part  114   a  may be minimized. The base  181  may be more easily inserted through the lancing part  114   a  due to elastic deformation of the hook  185 . 
         [0090]    When the insertion of the base  181  through the lancing part  114   a  is completed, the hook  185  is caught by the front side of the lancing part  114   a.  As a result, the base  181  is prevented from being separated from the lancing part  114   a.    
         [0091]    In order to separate the heater bracket  180  from the upper housing  110 , the rear part of the heater bracket  180  may be raised, and may then be pulled in the rearward direction. As a result, a state in which the hook  185  is caught by the lancing part  114   a  may be released. Since the base  181  may be made of a metal sheet, which is easily deformable, the base  181  may be easily separated from the lancing part  114   a.  The base  181  may be easily separated from the lancing part  114   a  through the front slit  114   b  by the provision of the bent part  186 . 
         [0092]    The bracket support unit  114  may be integrally formed with the upper housing  110  through sheet metal working. The bracket  180  may be easily fixed to the upper housing  110  without using fixing devices, such as screws. In addition, after the bracket  180  is fixed to the bracket support unit  114 , a state in which the bracket  180  is fixed to the bracket support unit  114  may be securely maintained without using additional fixing devices. 
         [0093]    It will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure covers modifications and variations that come within the scope of the appended claims and their equivalents.