Cooking appliance

Abstract

A cooking appliance is proposed. The cooking appliance includes a frame ( 60 ) having a cooking chamber, a circulation device (C) provided in the frame ( 60 ) and having a circulation chamber (SA), and a heating device ( 100 ) having a combustion chamber (S 5 ) connected to the circulation chamber (SA) through a connection passage ( 61 a ) of the frame ( 60 ). The heating device ( 100 ) includes a burner case ( 110 ) forming the combustion chamber (S 5 ), and a burner ( 120 ) including a flame hole for generating a flame. The heating device ( 100 ) includes a flame guide ( 140 ) arranged between an upper portion of the flame hole ( 125 ) and the connection passage ( 61 a ). The flame guide ( 140 ) directs secondary air toward a flame. Accordingly, the flame guide ( 140 ) allows stable generation of a flame and simultaneously complete combustion with secondary air supply.

What is claimed is: 
     
         1 . A cooking appliance comprising:
 a frame in which a cooking chamber is formed;   a circulation device having a circulation chamber therein, the circulation chamber configured to allow airflow between the circulation chamber and the cooking chamber; and   a heating device having a combustion chamber therein, which is configured to allow airflow between the combustion chamber and the circulation chamber via a connection passage of the frame,   wherein the heating device comprises:   a burner case in which the combustion chamber is formed;   a burner provided in the combustion chamber, and comprising a flame hole to generate a flame, and   a flame guide arranged between an upper portion of the flame hole and the connection passage, and directing secondary air toward the flame.   
     
     
         2 . The cooking appliance of  claim 1 , wherein the combustion chamber includes a flow path guide forming a heating flow path in the combustion chamber, the flow path guide and the flame guide are spaced apart from each other to form a junction part, and the secondary air is transferred toward the flame via the junction part. 
     
     
         3 . The cooking appliance of  claim 1 , wherein a junction part is provided by the flame guide and the burner case spaced apart from each other, and the secondary air is transferred toward the flame via the junction part. 
     
     
         4 . The cooking appliance of  claim 1 , wherein an air introduction hole is formed open in the flame guide, and the secondary air is transferred from an upper space of the flame guide toward the flame via the air introduction hole. 
     
     
         5 . The cooking appliance of  claim 1 , wherein the flame guide comprises:
 a fixation body coupled to the burner; and   a guide blade extending from the fixation body and arranged between the flame hole and the connection passage,   wherein the guide blade extends in an upward-inclined direction toward the connection passage.   
     
     
         6 . The cooking appliance of  claim 5 , wherein an air introduction hole is formed through the guide blade, and the secondary air is transferred from an upper space of the flame guide toward the flame via the air introduction hole. 
     
     
         7 . The cooking appliance of  claim 5 , wherein a space for a flame to be generated is provided at a lower portion of an end of the guide blade, and a junction part is provided at an upper portion of the end of the guide blade for the secondary air to be joined toward the flame. 
     
     
         8 . The cooking appliance of  claim 1 , wherein a cooling flow path is formed between the flame guide and a lower portion of the frame, and a heating flow path is formed between the flame guide and a lower portion of the burner case. 
     
     
         9 . The cooking appliance of  claim 2 , wherein a rear bent portion is provided on one end portion of the flow path guide, a flow path entrance end is provided on a lower portion of the frame along an edge of the connection passage, and a cooling flow path partitioned from the heating flow path is formed by the rear bent portion and the flow path entrance end spaced apart from each other. 
     
     
         10 . The cooking appliance of  claim 1 , wherein the flame guide is arranged in an upward-inclined direction from the burner toward the connection passage, and a heating flow path guiding heated air is formed between a lower portion of the flame guide and a bottom surface of the burner case. 
     
     
         11 . The cooking appliance of  claim 1 , wherein the heating device is arranged at the side opposite to the circulation device with the connection passage located therebetween, and the combustion chamber is arranged at a lower portion of the circulation chamber. 
     
     
         12 . The cooking appliance of  claim 1 , further comprising: an outer case containing the frame,
 wherein the heating device comprises a first inlet part open toward a surface of the burner, and   a second inlet part connected to the combustion chamber is provided between the heating device and the outer case.   
     
     
         13 . The cooking appliance of  claim 1 , wherein when air heated by the burner moves from the combustion chamber to the circulation chamber, the combustion chamber has a pressure lower than an external pressure of the heating device. 
     
     
         14 . A cooking appliance comprising:
 a frame in which a cooking chamber is formed;   a circulation device having a circulation chamber therein, the circulation chamber communicating with the cooking chamber;   a burner in which a combustion chamber connected to the circulation chamber is formed, and configured to heat air in the combustion chamber;   a flow path guide provided in the heating device and directing air heated by the combustion chamber into the circulation chamber; and   a flame guide arranged between the burner and the flow path guide,   wherein the flow path guide and the flame guide are connected to each other, and a cooling flow path and a heating flow path partitioned from each other are formed in the combustion chamber.   
     
     
         15 . The cooking appliance of  claim 14 , wherein the frame comprises a connection passage connecting the circulation chamber and the combustion chamber to each other, and the flow path guide and the flame guide form the heating flow path continued from the burner to the connection passage. 
     
     
         16 . The cooking appliance of  claim 14 , wherein the heating flow path is continuously formed along an internal space surrounded by the flow path guide and the flame guide, and the cooling flow path is formed around the flow path guide and an external part of the flame guide. 
     
     
         17 . The cooking appliance of  claim 14 , wherein one end portion of the flow path guide is open toward a flame hole of the burner, and the flame guide connects the end of the flow path guide, which is open toward the flame hole, and an upper portion of the flame hole to each other. 
     
     
         18 . The cooking appliance of  claim 14 , wherein the frame comprises a connection passage connecting the circulation chamber and the combustion chamber to each other, and the flow path guide partitions the connection passage into a heating outlet part connected to the heating flow path, and a cooling outlet part connected to the cooling flow path. 
     
     
         19 . The cooking appliance of  claim 14 , wherein the cooling flow path comprises:
 a first cooling flow path passing between an upper portion of the flame guide and a lower portion of the frame; and   a second cooling flow path passing between a lower portion of the flame guide and a bottom portion of the heating device and extending toward the circulation device along a surface of the flow path guide.   
     
     
         20 . The cooking appliance of  claim 14 , wherein the flow path guide comprises:
 a guide front surface part providing a front surface of the flow path guide;   a guide side surface part providing a side surface of the flow path guide;   a guide upper surface part providing an upper surface of the flow path guide and comprising a heating outlet part open toward the circulation chamber; and   a guide rear surface part providing a rear surface of the flow path guide and facing the burner,   wherein the heating flow path is provided among the guide front surface part, the guide side surface part, the guide upper surface part, and the guide rear surface part, and   the flame guide protrudes on the guide rear surface part toward the burner and lengthens the heating flow path.