Patent Publication Number: US-2023160577-A1

Title: Cooking appliance

Description:
TECHNICAL FIELD 
     The present disclosure relates to a cooking appliance having improved aesthetics by reducing a size of an air outlet provided on a front side of a cabinet. 
     BACKGROUND ART 
     A cooking appliance is an appliance for heating and cooking a cooking object, such as food, and refers to a device capable of providing various functions related to cooking, such as heating, defrosting, drying, and sterilizing the cooking object. Examples of such a cooking appliance include an oven such as a gas oven or an electric oven, a microwave heating device (hereinafter referred to as a microwave), a gas range, an electric range, a gas grill, or an electric grill. 
     In general, an oven is an appliance configured to cook food using a cooking chamber that includes a heating device configured to apply heat to the cooking chamber, and a circulation fan configured to circulate the heat, which is generated by the heating device, in the cooking chamber. 
     In general, an oven includes a cabinet forming an exterior of the oven, and in which a front side is opened to form a cooking chamber, into which food to be cooked is put, and a door installed in the front of the cabinet to selectively open and close the cooking chamber. 
     The door may include a plurality of glass layers to prevent the heat inside the cooking chamber from being emitted outside and lowering a temperature of external surface of the door. Because the temperature of the door rises due to the heat inside the cooking chamber, an air inlet, through which outside air is sucked, may be provided in the door to prevent an increase in the temperature of the door. Air sucked through the air inlet may be discharged to the front of the cabinet through an air flow path provided between the plurality of glasses. 
     An air outlet, through which air passing through the air flow path provided inside the door is discharged, may be provided on the front side of the cabinet. Recently, the needs of consumers for differentiating the exterior design of products have increased. In order to differentiate the exterior design of the cooking appliance, research has been conducted to reduce the size of the air outlet. 
     DISCLOSURE 
     Technical Problem 
     The present disclosure is directed to providing a cooking appliance capable of having improved aesthetics by reducing a size of an air outlet provided in a front side of a cabinet. 
     The present disclosure is directed to providing a cooking appliance capable of preventing an increase in surface temperature of a door while reducing a size of an air outlet. 
     The present disclosure is directed to providing a cooking appliance capable of preventing an increase in flow path resistance and a reduction in air volume caused by a reduction in size of an air outlet. 
     Technical Solution 
     One aspect of the present disclosure provides a cooking appliance including a cabinet, a cooking chamber located inside the cabinet and including an open front side, a door configured to open and close the open front side of the cooking chamber, a blower fan disposed above the cooking chamber to blow air, an air outlet provided in a gap between an upper end of the door and the cabinet, a duct provided to guide the air blown by the blower fan to the air outlet, and a circulation duct provided to connect the duct and a side of the blower fan to allow a portion of the air, which moves to the air outlet by the blower fan to be re-introduced into the blower fan. 
     A height of an inside of the duct may be gradually reduced from the blower fan toward the air outlet. 
     The circulation duct may connect an upper surface of the duct adjacent to the air outlet to an upper side of the blower fan. 
     The door may include a door flow path provided to guide air from a lower side of the door to an upper side of the door. 
     The door may further include a plurality of glasses. 
     The door flow path may be formed between the plurality of glasses. 
     The door may further include a door outlet provided to discharge air, which is moved upward of the door by the door flow path, to an upper portion of the cooking chamber. 
     The cabinet may include an air inlet disposed to face the door outlet and provided to introduce air, which is discharged through the door outlet, into the cooking chamber. 
     The duct may include an inlet flow path provided to guide air from the air inlet to the blower fan, and an outlet flow path provided to guide air from the blower fan to the air outlet. 
     The circulation duct may include a circulation flow path provided to guide air from one side of the outlet flow path to the blower fan. 
     The blower fan may be configured to suck air from upper and lower sides of the blower fan, respectively, so as to suck air through the inlet flow path and the circulation flow path. 
     The duct may include a duct frame disposed above the cooking chamber and forming a lower surface of the inlet flow path, a first duct coupled to the duct frame and forming an upper surface of the outlet flow path, and a second duct disposed between the first duct and the duct frame and forming an upper surface of the inlet flow path and a lower surface of the outlet flow path. 
     The duct may further include a guide duct extending from a front end of the second duct to the air outlet. 
     The guide duct may be provided to cover an upper surface of the door to prevent the air inside the outlet flow path from moving toward the door outlet. 
     The circulation duct may include a duct inlet through which air is introduced from the duct to the circulation duct, and a duct outlet through which air is discharged from the circulation duct to the blower fan. 
     The duct inlet may be located in front of the air inlet. 
     The cabinet may include a control panel forming a front side of the cabinet together with the door. 
     The air outlet may be provided in a gap formed between the upper end of the door and the control panel. 
     A height of the gap between the upper end of the door and the control panel may be uniformly provided. 
     Another aspect of the present disclosure provides a cooking appliance including a cabinet, a cooking chamber located inside the cabinet and including an open front side, a door configured to open and close the open front side of the cooking chamber and including a plurality of glasses, and a door flow path formed between the plurality of glasses, a blower fan disposed above the cooking chamber to blow air, an inlet flow path provided to move air, which is discharged to an outside of the door by passing through the door flow path, to the blower fan, an outlet flow path provided to discharge air, which is introduced into the blower fan through the inlet flow path, to a front side of the cabinet, and a circulation flow path provided to move air from one side of the outlet flow path toward the blower fan. 
     The outlet flow path may discharge air through an air outlet provided in a gap between an upper end of the door and the cabinet. 
     A height of the outlet flow path may be gradually reduced toward the air outlet. 
     The cooking appliance may further include a duct forming the inlet flow path and the outlet flow path. 
     The duct may include a duct frame disposed above the cooking chamber and forming a lower surface of the inlet flow path, a first duct coupled to the duct frame and forming an upper surface of the outlet flow path, a second duct disposed between the first duct and the duct frame and forming an upper surface of the inlet flow path and a lower surface of the outlet flow path, and a guide duct extending from a front end of the second duct to the air outlet, and provided to cover an upper surface of the door to prevent the air inside the outlet flow path from moving toward the door outlet. 
     One end of the circulation flow path through which air is introduced from the outlet flow path may be located in front of one end of the inlet flow path through which the air discharged to the outside of the door is introduced. 
     Another aspect of the present disclosure provides a cooking appliance including a cabinet, a cooking chamber located inside the cabinet and including an open front side, a door configured to open and close the cooking chamber and including a plurality of glasses forming a door flow path, a blower fan configured to suck air passing through the door flow path and configured to discharge the air to a front side of the cabinet, a duct provided to guide air, which passes through the door flow path, toward the blower fan, and provided to guide air, which is blown by the blower fan, to the front side of the cabinet, and a circulation duct provided to guide a portion of air, which moves from the blower fan to the front side of the cabinet, toward the blower fan. 
     Advantageous Effects 
     A cooking appliance may have improved aesthetics by reducing a size of an air outlet provided in a front side of a cabinet. 
     Further, a cooking appliance may prevent an increase in surface temperature of a door while reducing a size of an air outlet. 
     Further, a cooking appliance may prevent an increase in flow path resistance and a reduction in air volume caused by a reduction in size of an air outlet. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of a cooking appliance according to one embodiment of the present disclosure. 
         FIG.  2    is a front view of the cooking appliance according to one embodiment of the present disclosure, illustrating a state in which a door is opened. 
         FIG.  3    is an enlarged view of a part A of  FIG.  1    from a different angle. 
         FIG.  4    is a side cross-sectional view of the cooking appliance according to one embodiment of the present disclosure. 
         FIG.  5    is an enlarged view of a part of  FIG.  4   , illustrating an air flow in a flow path of the cooking appliance according to one embodiment of the present disclosure. 
         FIG.  6    is an disassembled view of a duct in the cooking appliance according to one embodiment of the present disclosure. 
         FIG.  7    is a view of a blower fan separated from the cooking appliance according to one embodiment of the present disclosure. 
         FIG.  8    is a view of the blower fan shown in  FIG.  7    from a different angle. 
         FIG.  9    is a view of an inside of an electrical component compartment in the cooking appliance according to one embodiment of the present disclosure. 
     
    
    
     MODES OF THE INVENTION 
     Embodiments described in the disclosure and configurations shown in the drawings are merely examples of the embodiments of the disclosure, and may be modified in various different ways at the time of filing of the present application to replace the embodiments and drawings of the disclosure. 
     In addition, the same reference numerals or signs shown in the drawings of the disclosure indicate elements or components performing substantially the same function. 
     Also, the terms used herein are used to describe the embodiments and are not intended to limit and/or restrict the disclosure. The singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. In this disclosure, the terms “including”, “having”, and the like are used to specify features, numbers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more of the features, elements, steps, operations, elements, components, or combinations thereof. 
     It will be understood that, although the terms first, second, third, etc., may be used herein to describe various elements, but elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the disclosure, a first element may be termed as a second element, and a second element may be termed as a first element. The term of “and/or” includes a plurality of combinations of relevant items or any one item among a plurality of relevant items. 
     In the following detailed description, the terms of “front”, “rear”, “left side”, “right side” and the like may be defined by the drawings, but the shape and the location of the component is not limited by the term. 
     Hereinafter exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. 
       FIG.  1    is a perspective view of a cooking appliance according to one embodiment of the present disclosure.  FIG.  2    is a front view of the cooking appliance according to one embodiment of the present disclosure, illustrating a state in which a door is opened.  FIG.  3    is an enlarged view of a part A of FIG.  1  from a different angle.  FIG.  4    is a side cross-sectional view of the cooking appliance according to one embodiment of the present disclosure. 
     Hereinafter “front” refers to a X direction of  FIG.  1   . “Height” refers to a length in a Z direction of  FIG.  1   . “Lateral side” refers to a Y direction in  FIG.  1   . 
     As illustrated in  FIGS.  1  to  4   , a cooking appliance  1  may include a cabinet  10  forming an exterior, a cooking chamber  20  formed inside the cabinet  10  and provided with an open front side, and a door  30  formed on the front side and configured to open and close the cooking chamber  20 . 
     The cabinet  10  may include a front panel  11  forming the front side of the cabinet  10 , a side panel  13  forming a side surface of the cabinet  10 , a rear panel  15  forming a rear surface of the cabinet  10 , and an upper panel  16  forming an upper portion of the cabinet  10 . 
     A control panel  17  may be provided on a front upper portion of the front panel  11  covering a front side of an electrical component compartment  50  to be described later. The control panel  17  may also be referred to as an electrical component compartment cover. A display module  40  to be described later may be mounted on the control panel  17 . The front panel  11  may be provided with an air inlet  11   a  which sucks high-temperature air discharged from the inside of the door  30  when the door is in the open  30  position. 
     A suction member  14  may be formed on the side panel  13  to suck air into the electrical component compartment  50  to be described later. Outside air sucked into the electrical component compartment  50  through the suction member  14  may flow inside the electrical component compartment and cool an electrical component. 
     The cooking chamber  20  may be formed inside the cabinet  10  to have a box shape with an open front side. Food may be put in and out of the cooking chamber  20  through the open front side of the cooking chamber  20 . 
     A plurality of supports (not shown) may be provided on opposite sidewalls of the inside of the cooking chamber  20 , and a rack (not shown), on which food is placed, may be mounted on the plurality of supports. 
     A divider (not shown) dividing the cooking chamber  20  into a plurality of spaces may be detachably mounted on the plurality of supports. The cooking chamber  20  divided into the plurality of spaces by the divider may not have to have the same size, but may have different sizes. The divider may be formed of a heat insulating material to insulate each cooking chamber  20 . Accordingly, the plurality of spaces in the cooking chamber  20  may be used in various ways according to a user&#39;s intention. 
     A heater  21  configured to heat food may be arranged in the cooking chamber  20 , and the heater  21  may be an electric heater including an electric resistor. The heater  21  is not limited to an electric heater and may be a gas heater configured to generate heat by burning gas. Accordingly, the cooking appliance may include an electric oven and a gas oven. 
     A circulation fan  25  configured to circulate air in the cooking chamber  20  to evenly heat food, and a circulation motor  23  configured to drive the circulation fan  25  may be arranged at a rear of the cooking chamber  20 . According to one embodiment of the present disclosure, the circulation fan  25  may include a first circulation fan  25   a  and a second circulation fan  25   b . The circulation motor  23  may include a first circulation motor  23   a  configured to drive the first circulation fan  25   a  and a second circulation motor  23   b  configured to drive the second circulation fan  25   b . However, the present disclosure is not limited thereto, and the number of circulation fans and circulation motors may be one or three or more. 
     A fan cover  27  covering the circulation fan  25  may be provided on a front side of the circulation fan  25 , and a plurality of through holes  29  may be formed in the fan cover  27  to allow air to flow. 
     The open front side of the cooking chamber  20  may be opened and closed by the door  30 , and the door  30  may be hinged to a lower portion of the cabinet  10  so as to be rotated with respect to the cabinet  10 . A door handle  31  gripped by a user may be provided on a front upper portion of the door  30 . A user may open and close the cooking chamber  20  by gripping the door handle  31 . A door duct  38  may be provided at the upper portion of the door  30 . The door duct  38  may include a door outlet  38   a  discharging high-temperature air inside the door  30  to an outside of the door  30 . The door may include a lock  37  configured to allow the door  30  to be locked or unlocked with respect to the cabinet  10  according to a use mode. An air inlet  39  may be disposed on a lower portion of the door to suck outside air into the door. 
     The door  30  may include a door flow path  32  through which air flows into the door  30  to cool the door  30 . The door  30  may include a plurality of glass layers forming the door flow path  32 . The door flow path  32  may be formed between the plurality of glass layers. According to one embodiment of the present disclosure, the door  30  may include four glass layers. The door flow path  32  may include a first door flow path  33  and a second door flow path  34  positioned at a rear of the first door flow path  33 . Further, the door  30  may include a closed flow path  35 . The closed flow path  35  may be formed between the plurality of glasses, similarly to the door flow path  32 . The closed flow path  35  may be formed by a sealing member  36  disposed along edges of the plurality of adjacent glasses. The closed flow path  35  may prevent the heat inside the cooking chamber  20  from being cooled by the door  30 . The door flow path  32  may prevent the door  30  from being heated to a predetermined temperature or higher due to the heat inside the cooking chamber  20 . 
     The cooking appliance  1  may include a display module  40  provided to display various types of operation information and allow a user to input an operation command. The display module  40  may be mounted on the control panel  17  provided on the front upper portion of the front panel  11 . The control panel  17  may be provided with a manipulator  41  provided to additionally operate the cooking appliance  1 . 
     The cooking appliance  1  may be provided with the electrical component compartment  50  accommodating electrical components (not shown) configured to control an operation of various accessories including the display module  40 . The electrical component compartment  50  may be provided above the cooking chamber  20 , and an insulating material (not shown) insulating the electrical component compartment  50  and the cooking chamber  20  may be arranged between the electrical component compartment  50  and the cooking chamber  20  to prevent the heat of the cooking chamber  20  from being transmitted to the electrical component compartment  50 . As well as being arranged between the electrical component compartment  50  and the cooking chamber  20 , the insulating material may be provided to completely cover the outside of the cooking chamber  20  to prevent the heat of the cooking chamber  20  from being transmitted to the outside of the cooking appliance  1 . 
     Because a temperature inside the electrical component compartment  50  rises due to the heat of various electrical components, the cooking appliance  1  may include a blower fan  90  configured to circulate the air in the electrical component compartment  50  to cool the electrical component compartment  50 , and a drive motor  51  configured to drive the blower fan  90 . The blower fan  90  and the drive motor  51  may be located inside the electrical component compartment  50 . 
     The cooking appliance  1  may include a flow path  110  that not only cools the inside of the electrical component compartment  50  but also cools the high-temperature air passing through the door flow path  32  and then discharges the cooled air to a front side of the cabinet  10 . 
     The flow path  110  may include an inlet flow path  111  sucking air that passes the door flow path  32  and then is discharged to the outside of the door  30  through the door outlet  38   a , and an outlet flow path  112  discharging air, which is introduced to the blower fan  90  through the inlet flow path  111 , to the front side of the cabinet  10 . A detail description will be described later. 
     According to the present disclosure, the cooking appliance  1  may include a circulation flow path  113  guiding air from one side of the outlet flow path  112  to an upper side of the blower fan  90 . The circulation flow path  113  will be described later. 
     Referring to  FIGS.  1  to  3   , a gap may be provided between the cabinet  10  and an upper end of the door  30 . Particularly, one or more gaps may be provided between a lower end of the control panel  17  and the upper end of the door  30 . 
     The gaps may include a first region  10   a  and a second region  10   b . The first region  10   a  is also referred to herein as an air outlet  10   a . The second region  10   b  may indicate a region excluding the first region  10   a.    
     According to one embodiment of the present disclosure, a height g 2  of the first region  10   a  and a height g 1  of the second region  10   b  may be equal to each other. In other words, sizes of the first region  10   a  and the second region  10   b  formed between the lower end of the control panel  17  and the upper end of the door  30  may be uniformly provided along the lateral side. 
     According to one embodiment of the present disclosure, the height of the first region  10   a  and the second region  10   b  may be 8 mm or less. Particularly, the height of the first region  10   a  and the second region  10   b  may be 4 mm to 8 mm. In one embodiment of the present disclosure, the first region  10   a  and the second region  10   b  may be 4 mm. 
     According to the present disclosure, the height of the air outlet  10   a  may be less than a height of an air outlet in a conventional cooking appliance. Due to a reduction in the height of the air outlet  10   a , a flow resistance in the air outlet  10   a  and in a vicinity thereof may be increased and thus an amount of air that is discharged to the front side of the cabinet  10  through the air outlet  10   a  may be significantly reduced. Further, air passing through the door flow path  32  may not flow into the blower fan  90 , but rather the air may flow from the blower fan  90  toward the door flow path  32 . The air passing through the door flow path  32  may not be smoothly discharged toward the front side of the cabinet  10 , and a surface temperature of the door  30  may be increased. When the surface temperature of the door  30  is greater than or equal to a predetermined temperature, a safety regulation may not be satisfied. 
     According to the present disclosure, it is possible to provide the cooking appliance with improved aesthetics by reducing the size of the air outlet  10   a . The size of the air outlet  10   a  may particularly refer to the height of the air outlet  10   a . It is possible to provide the cooking appliance capable of preventing an increase in the surface temperature of the door  30  while reducing the size of the air outlet  10   a . In addition, the cooking appliance may prevent the increase in the flow resistance and the reduction in the air volume caused by the reduction in the size of the air outlet  10   a.    
       FIG.  5    is an enlarged view of a part of  FIG.  4   , illustrating an air flow in a flow path of the cooking appliance according to one embodiment of the present disclosure. 
     Hereinafter the flow of air in the cooking appliance according to one embodiment of the present disclosure will be described in detail with reference to  FIG.  5   . 
     Referring to  FIG.  5   , air introduced into the door inlet  39  (refer to  FIG.  4   ) may move upward along the door flow path  32  and may be discharged to the outside of the door  30  through the door outlet  38   a.    
     The front panel  11  may be provided with the air inlet  11   a  disposed to face the door outlet  38   a . Air discharged to the outside of the door  30  through the door outlet  38   a  may be introduced into the inlet flow path  110  through the air inlet  11   a . Air on the inlet flow path  110  may be introduced into the blower fan  90  by the blower fan  90  configured to suck air in opposite directions. The air moving along the inlet flow path  110  may be introduced into the blower fan  90  through a duct hole  82   a  provided under the blower fan  90 . 
     The blower fan  90  may be configured to suck air in opposite directions. The blower fan  90  may suck air from an upper side of the blower fan  90 , and at the same time, suck air from a lower side of the blower fan  90 . Therefore, the air moving along the inlet flow path  110  may be sucked from the lower side of the blower fan  90  to the blower fan  90 , and the air inside the electrical component compartment  50  may be sucked from the upper side of the blower fan  90  to the blower fan  90 . 
     Air sucked into the blower fan  90  may be discharged to the lateral side of the blower fan  90 . The air discharged by the blower fan  90  may move along the outlet flow path  112 . The outlet flow path  112  may be located above the inlet flow path  111 . The outlet flow path  112  may extend from the blower fan  90  to the air outlet  10   a . The outlet flow path  112  may be provided such that a height of the outlet flow path  112  is gradually reduced from the blower fan  90  toward the air outlet  10   a.    
     As described above, according to the present disclosure, the height of the air outlet  10   a  is less than the height of the air outlet in comparison with the conventional manner, and the height of the outlet flow path  112  is gradually reduced toward the air outlet  10   a . As the height of the air outlet  10   a  is reduced, the flow resistance in the outlet flow path  112  adjacent to the air outlet  10   a  may be increased and the air volume may be reduced. In order to prevent an increase in the surface temperature of the door  30  caused by the increase of the flow resistance and the reduction of the air volume, the cooking appliance  1  according to the present disclosure may include the circulation flow path  113 . 
     The circulation flow path  113  may connect one side of the outlet flow path  112  adjacent to the air outlet  10   a  to the upper portion of the blower fan  90 . One end of the circulation flow path  113  may be connected to an upper surface of the outlet flow path  112 , and the other end of the circulation flow path  113  may be connected to the upper side of the blower fan  90 . As the circulation flow path  113  is provided, a portion of air at the outlet side of the outlet flow path  112  having an increased flow path resistance is reintroduced into the blower fan  90  through the circulation flow path  113 . Accordingly, the flow resistance of the outlet side of the outlet flow path  112  may be reduced, and the remaining air on the outlet side of the outlet flow path  112  may be discharged to the front of the cabinet  10  through the air outlet  10   a.    
     In summary, the air passing through the door flow path  32  may flow into the outlet flow path  112  through the inlet flow path  111  and the blower fan  90 , a portion of the air may be reintroduced into the blower fan  90  by the circulation flow path  113 , and the remaining air may be discharged to the front of the cabinet  10  through the air outlet  10   a . That is, the air introduced through the door inlet  39  may be smoothly discharged through the air outlet  10   a , and the air in the door flow path  32  may move smoothly. As the air moves through the door flow path  32 , the door  30  may be cooled, and the increase in the surface temperature of the door  30  may be prevented. 
     Meanwhile, the circulation flow path  113  may include a duct inlet  101  through which air is introduced into the circulation flow path  113  and a duct outlet  102  through which air is discharged from the circulation flow path  113 . The duct inlet  101  may be connected to the upper surface of the outlet flow path  112 , and the duct outlet  102  may be connected to the upper side of the blower fan  90 . 
     According to one embodiment of the present disclosure, the duct inlet  101  may be provided to be located in front of the air inlet  11   a . This is because the air inlet  11   a  is provided in the front panel  11  and the outlet flow path  112  has a very small height in front of the front panel  11 , and thus the flow resistance increases in front of the front panel  11 . Therefore, in order to allow the circulation flow path  113  to operate more efficiently, the duct inlet  101  may be located in front of the air inlet  11   a.    
     A guide duct  12  may be provided at an outlet side of the outlet flow path  112 . The guide duct  12  may be formed integrally with a second duct  82  to be described later, or may be formed to be separated from the second duct  82 . The guide duct  12  may be provided to prevent air, which moves along the outlet flow path  112 , from moving to the door outlet  38   a  of the door  30 . The guide duct  12  may be provided to cover the upper surface of the door  30 . 
       FIG.  6    is an disassembled view of a duct in the cooking appliance according to one embodiment of the present disclosure. 
     Hereinafter a structure of the duct forming the flow path  110  of the present disclosure will be described in detail with reference to  FIG.  6   . 
     Referring to  FIG.  6   , the cooking appliance  1  may include a duct frame  60  covering an upper portion of the cooking chamber  20  and forming a lower surface of the electrical component compartment  50 , a duct  80  coupled to the duct frame  60 , and a circulation duct  100 . 
     The duct frame  60  may form the lower surface of the electrical component compartment  50 . In addition, the duct frame  60  may be provided to cover the upper surface of the cooking chamber  20 . The duct frame  60  may include a duct groove  61  forming a lower surface of the inlet flow path  111 . The duct groove  61  may be formed by recessing a portion of the duct frame  60  downward. 
     The duct  80  may include a first duct  81  to which the drive motor  51  and the blower fan  90  are mounted, and the second duct  82  disposed between the first duct  81  and the duct frame  60 . The first duct  81  may be coupled to the duct frame  60 . The first duct  81  may form an upper surface of the outlet flow path  112 . 
     The second duct  82  may form an upper surface of the inlet flow path  111  and a lower surface of the outlet flow path  112 . The second duct  82  may include the duct hole  82   a  through which air moving along the inlet flow path  111  is introduced into the blower fan  90  from the lower side of the blower fan  90 . The duct hole  82   a  may be provided to penetrate the second duct  82 . 
     The circulation duct  100  may include the duct inlet  101  and the duct outlet  102 . The duct inlet  101  may be disposed to be connected to the upper surface of the outlet flow path  112 . The duct outlet  102  may be disposed to be connected to the upper portion of the circulation fan  90 . The circulation duct  100  may be disposed above the duct  80 . 
     The guide duct  12  may extend from a front end of the second duct  82  to the air outlet  10   a . As described above, the guide duct  12  may be provided integrally with the second duct  82 , unlike that illustrated in the drawings. The guide duct  12  may be provided to cover the upper surface of the door  30 . The air inlet  11   a  may be provided under the guide duct  12 . 
       FIG.  7    is a view of a blower fan separated from the cooking appliance according to one embodiment of the present disclosure.  FIG.  8    is a view of the blower fan shown in  FIG.  7    from a different angle. 
     Hereinafter the blower fan of the present disclosure will be described with reference to  FIGS.  7  and  8   . 
     Referring to  FIGS.  7  and  8   , the blower fan  90  according to one embodiment of the present disclosure may be configured to suck air in opposite directions. Particularly, the blower fan  90  may be provided to suck air from the upper and lower sides of the blower fan  90  and discharge the air laterally. 
     The blower fan  90  may include a shaft coupler  90   a  provided to allow a shaft of the drive motor  51  to coupled thereto. The shaft coupler  90   a  may include a shaft coupling hole  90   b  into which the shaft is inserted. 
     The blower fan  90  may include a first body  91  provided in the form of a disk having a larger diameter than the duct hole  82   a , a first hole  92  formed in a center of the body  91 , and a plurality of blades  93 , and a second body  94  corresponding to the size of the duct hole  82   a . Air may be introduced into the blower fan  90  from the upper side of the blower fan  90  through the first hole  92 . 
     The blade  93  may include a first blade member  93   a  and a second blade member  93   b . The first blade member  93   a  may generate a suction force for sucking air from the upper side of the blower fan  90  to the blower fan  90 . The second blade member  93   b  may generate a suction force for sucking air from the lower side of the blower fan  90  to the blower fan  90 . According to one embodiment of the present disclosure, the first blade member  93   a  may be provided to be larger than the second blade member  93   b.    
       FIG.  9    is a view of an inside of an electrical component compartment in the cooking appliance according to one embodiment of the present disclosure. 
     Referring to  FIG.  9   , the circulation duct  100  may be disposed in the center of the electrical component compartment  50 . At this time, the center of the electrical component compartment  50  refers to the center of the electrical component compartment  50  with respect to a left and right direction Y. Air discharged by the blower fan  90  may have the greatest increase in flow path resistance at the center of the outlet flow path  112 . In order to reduce the flow resistance so as to increase the air volume, the circulation duct  100  may be disposed in the center of the electrical component compartment  50  as the upper side of the outlet flow path  112 . 
     While the present disclosure has been particularly described with reference to exemplary embodiments, it should be understood by those of skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure.