Cooking equipment

Abstract

The utility model relates to cooking equipment. The cooking equipment can comprise a shell (10) and a frame (60) arranged in the shell. A cooking chamber (S1) may be formed in the frame (60). The cooking equipment can further comprise a circulating device (C) provided with a circulating cavity (SA) communicated with the cooking chamber (S1). The heating device (100) may be formed with a combustion chamber (S5) connected to the circulation chamber (SA). The heating device (100) may be provided with a burner (120) for heating air flowing into the combustion chamber (S5). At this time, the heating device (100) may be provided with a first intake part (IP1) that opens toward the surface of the burner (120). A second air inlet part (IP2) connected with the combustion chamber (S5) can be arranged between the heating device (100) and the shell (10).

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cooking equipment. BACKGROUND

[0002] The cooking equipment is one of cooking equipment for cooking food, and is a device set in kitchen space to cook food. According to the heat source or form used, the type of fuel, this cooking equipment can be classified in many ways. If the cooking equipment is classified according to the form of cooking food, it can be classified into open type cooking equipment and closed type cooking equipment according to the form of the space where the food is placed. Closed type cooking equipment has oven, electromagnetic microwave oven, etc., and open type cooking equipment has cooktop, griddle, etc.

[0003] The closed type cooking equipment is a cooking equipment that uses a door to shield the space where the food is located and heats the shielded space to cook the food. A cooking chamber is provided in the closed type cooking equipment, which is a space that accommodates food and is shielded when cooking food.

[0004] In the cooking equipment using a gas stove as a heat source in the closed type cooking equipment, a burner can be provided to heat the cooking material inside the cooking chamber. For example, a burner can be provided at the rear of the cooking chamber to heat air. A circulating fan (convection fan) can be provided at the rear of the burner to uniformly deliver the air heated by the burner to the entire cooking chamber.

[0005] If the circulating fan is operating, air is drawn in the direction of the circulating fan, and the flame of the burner is also directed to the rear wall of the cooking chamber. If this happens, the wall of the cooking chamber can be overheated, and the coating such as enamel can be damaged by heat. To solve this problem, an additional protection means such as a burner reflector needs to be provided in the cooking equipment to protect the wall of the cooking chamber from the heat of the burner.

[0006] In addition, there is a problem that the flame of the burner is unstable due to the flow of air drawn by the circulating fan. This problem can be solved by providing an additional flame stabilizer between the burner and the circulating fan, so that the flow of air caused by the circulating fan does not directly affect the burner.

[0007] However, since the existing cooking equipment requires such additional components as a burner reflector and a flame stabilizer, there is a problem that the number of components and manufacturing costs increase, and the structure of the heating device is complicated, making it difficult to design the cooking equipment.

[0008] As another method, in order to stabilize the flame, the circulation fan can be reduced in speed or operated intermittently. However, if the circulation fan is reduced in speed or operated intermittently, there is a disadvantage in that more cooking methods cannot be implemented using the heating device.

[0009] In addition, the rear of the existing cooking apparatus requires a space for installing the heating device including the burner. Thus, there is a problem in that the space for installing the heating device limits the depth of the cooking chamber in the front-rear direction. Also, there is a problem in that the volume of the cooking chamber is reduced due to the space occupied by additional components such as the heat shield and the flame stabilizing device.

[0010] Also, since the fan cover covering the circulation fan also needs to shield the heating device disposed at the rear, there is a limitation in reducing the size of the fan cover, and there is a disadvantage in that it is difficult to change the shape of the fan cover.

[0011] In addition, the burner disposed in the cooking apparatus not only heats the air in the heating cavity, but also heats the surrounding components such as the burner cover constituting the heating cavity. Thus, in addition to the air, the surrounding components are heated together, and there is a problem in that the thermal efficiency of the heating device is reduced.

[0012] At this time, the burner can overheat the surrounding components, but there is no additional cooling device for preventing overheating of the surrounding components other than the circulation fan, and thus there is a problem in that the durability of the cooking apparatus is reduced.

[0013] Also, in order to generate a stable flame, the burner of the cooking apparatus needs not only the primary air supplied directly to the burner, but also the secondary air supplied to the periphery of the flame hole. However, the existing cooking apparatus has a problem in that the secondary air can be smoothly supplied to the periphery of the flame hole only when the circulation fan is operated to generate suction, and if the circulation fan is not operated, there is a limitation in the supply of the secondary air. Thus, there is a limitation in that a function of cooking food only with the burner operated without the circulation fan operated cannot be provided. SUMMARY

[0014] PROBLEMS TO BE SOLVED BY THE INVENTION

[0015] The present invention has been made to solve the problems of the related art as described above, and the object of the present invention is to separate a heating device that heats air and a circulation device that circulates air of a cooking chamber and dispose them in separate spaces.

[0016] Another object of the present invention is to smoothly supply secondary air to the inside of the heating device.

[0017] Another object of the present application is to cool the heating device and the surrounding components using the air flowing into the heating device.

[0018] Another object of the present application is to supply the air heated by the heating device to the inside of the cooking chamber even when the circulation fan is not operated.

[0019] Another object of the present application is to arrange the heating device at the lower portion of the cooking chamber so that the radiant heat of the burner is not transferred to the wall surface of the cooking chamber.

[0020] Another object of the present application is to concentrate the flame generated in the heating device to the air supplied from the heating device to the circulation device.

[0021] Means for solving the problem

[0022] According to the features of the present application for achieving the above objects, the present application can include a housing and a frame arranged inside the housing. A cooking chamber can be formed in the frame. The cooking apparatus of the present application can further include a circulation device formed with a circulation cavity communicating with the cooking chamber. A combustion cavity connected to the circulation cavity can be formed in a heating device. The heating device can be arranged with a burner heating the air flowing into the combustion cavity. At this time, a first air inlet portion can be arranged in the heating device, which is open to the surface of the burner. A second air inlet portion connected to the combustion cavity can be arranged between the heating device and the housing. The outside air flowing through the second air inlet portion is used as secondary air supplied to the burner, so that the complete combustion of the gas can be smoothly completed.

[0023] Furthermore, the heating device can be arranged at the lower portion of the circulation device. With this structure, even if the fan (circulation fan) of the circulation device is driven, the flame of the burner is not affected by the fan, so that the flame stabilizing device (stabilizer) and the heat shield for protecting the inner wall of the cooking chamber from the flame can be omitted.

[0024] In addition, a connection passage connecting the circulation cavity and the combustion cavity can be opened in the frame. The heating device can be arranged on the opposite side of the circulation device across the connection passage. In this way, the flow path inside the circulation device and the flow path inside the heating device can form flow paths continuous with each other in the vertical direction. The air heated by the heating device can be supplied to the cooking chamber after rising along the continuous flow path by the natural draft.

[0025] Further, the second air inlet portion can be disposed apart from each other by the heating device and a surface of the housing facing the heating device. Thus, since the second air inlet portion is formed in a portion apart between two members, an additional pipe or an additional air supply device for implementing the second air inlet portion is not required to be provided in the cooking apparatus.

[0026] In addition, the heating device can be disposed in one direction along a rear edge of the lower portion of the frame. The second air inlet portion can be disposed in the one direction between the heating device and the housing. Thus, the second air inlet portion can be disposed in a long interval, thereby being able to supply a greater amount of outside air to the burner.

[0027] Further, the second air inlet portion can be disposed in a direction parallel to a surface of the housing. Thus, outside air can move along the surface of the housing, and can be naturally guided to the second air inlet portion.

[0028] In addition, the second air inlet portion can be longer than a length of the burner.

[0029] Further, a lower portion of the heating device can be formed with an air inflow passage through which air flows. The second air inlet portion can be disposed at an end position of the air inflow passage. Thus, since outside air first passes along the surface of the heating device through the air inflow passage and then flows into the second air inlet portion, a cooling function based on outside air can be effectively performed.

[0030] In addition, an opposite side of an entrance of the cooking chamber can be disposed with a back panel constituting the housing. The second air inlet portion can be disposed apart from each other by the heating device and the back panel.

[0031] Further, a disposition space can be disposed between the housing and the frame. The heating device can be disposed in the disposition space. Thus, since the heating device is disposed outside the cooking chamber, a volume of the cooking chamber is not reduced by a space occupied by the heating device.

[0032] In addition, the housing can be disposed with a panel opening portion opening the disposition space toward an outside of the housing. The panel opening portion is shielded by a shield cover, and a cover hole connected to the second air inlet portion can be opened by the shield cover.

[0033] In addition, the heating device can be disposed in a disposition space between the housing and the frame. The disposition space can form a continuous path from a lower portion of an entrance of the cooking chamber to a back portion of the housing.

[0034] Further, the heating device can be provided with a cavity opening portion that opens the combustion cavity toward the rear of the heating device. The second air inlet portion can be connected to the cavity opening portion.

[0035] Further, the cavity opening portion can form a part of the first air inlet portion.

[0036] Further, the lower portion of the heating device can be provided with an air inflow passage. One end of the air inflow passage blocked by the housing can be provided with the second air inlet portion.

[0037] Further, the heating device can be provided with a concave-convex portion that protrudes toward the air inflow passage. Further, the concave-convex portion can be provided in the lower portion of the burner. Since the concave-convex portion protrudes toward the air inflow passage of the outside air, the contact area with the outside air can be increased.

[0038] Further, a connection passage that connects the circulation cavity and the combustion cavity can be opened in the frame. A flame guide can be provided between the burner and the connection passage. The second air inlet portion and the upper space of the flame guide can form flow paths that are connected to each other.

[0039] Further, the first air inlet portion can be formed by a part of the heating device being penetrated. The first air inlet portion can be connected to the installation space.

[0040] Further, the circulation cavity can form a first flow path connected to the cooking chamber. The combustion cavity can form a second flow path that delivers air heated by the burner to the first flow path.

[0041] Further, the first flow path and the second flow path can be connected to each other in the height direction of the frame through a connection passage provided in the bottom surface of the frame.

[0042] Further, the burner generates a flame in a first direction, and the circulation cavity and the combustion cavity can form flow paths that are continuous to each other in a second direction orthogonal to the first direction.

[0043] Further, the heating device can include a burner housing and the burner built in the burner housing. The burner housing can include a front surface panel that forms the front surface of the combustion cavity, a side surface panel that forms the side surface of the combustion cavity, a top surface panel that forms the top surface of the combustion cavity, and a bottom surface panel that forms the bottom surface of the combustion cavity. At this time, the second air inlet portion can be provided by being spaced apart between one end portion of the bottom surface panel and the surface of the housing, or can be provided by being spaced apart between one end portion of the top surface panel and the surface of the housing.

[0044] In addition, the circulation device and the heating device can be fixed to the surface of the frame at different positions from each other. The second air inlet portion can be formed at a portion where the heating device is spaced apart from the housing.

[0045] Further, the heating device can be provided with a protruding portion that protrudes more toward the surface of the housing than the circulation device. The second air inlet portion can be provided between the distal end of the extending portion and the housing.

[0046] In addition, one end portion of the burner can be provided with a pipe inlet portion connected to a gas flow path inside the burner. The first air inlet portion can be open toward the pipe inlet portion through the heating device.

[0047] Effects of the Invention

[0048] As described above, the cooking apparatus of the present application has the following effects.

[0049] In the present application, the burner is provided at a lower portion of a circulation device that circulates air in a cooking chamber, and can be provided inside a burner housing that is a space separate from the circulation device. With this structure, even if a fan (circulation fan) of the circulation device is driven, the flame of the burner is not affected by the fan, so that a flame stabilizing device (stabilizer) is not required, and a heat shield for protecting the inner wall of the cooking chamber from the flame can also be omitted. As a result, the cooking apparatus has the effect of reducing the number of components and assembly man-hours and reducing manufacturing costs.

[0050] In addition, since the flame of the burner is not limited by the suction of the fan of the circulation device, the burner can generate a more stable flame, and as a result, the cooking performance of the cooking apparatus can be improved.

[0051] Further, in the present application, a first air inlet portion through which outside air directly flows toward the burner of the heating device, and a second air inlet portion through which outside air additionally flows to a gap between the heating device and the housing, can be provided. The outside air that flows through the second air inlet portion is used as secondary air supplied to the burner, so that complete combustion of the gas can be smoothly completed. Thus, the heating performance of the cooking apparatus can be improved.

[0052] At this time, in the present application, the combustion chamber inside the heating device becomes a negative pressure state by air heated by the burner rising to the upper heating chamber. Due to the negative pressure of the combustion chamber, outside air can be naturally drawn into the combustion chamber through the second air inlet portion and used as secondary air. In the present application, even if an additional fan for drawing in secondary air is not provided, outside air can be drawn in, so that the number of components can be reduced and the structure can be simplified, and unnecessary energy for supplying secondary air can be reduced.

[0053] In addition, even if the circulation fan of the circulation device does not operate, the outside air can flow into the heating device, and thus the cooking method using only the heating device without using the circulation fan can be provided. Accordingly, if the cooking apparatus of the present application is used, food can be cooked in more various ways.

[0054] Further, the second air inlet portion can extend along the edge of the rear lower portion of the frame at the portion where the heating device and the housing are spaced apart from each other. Thus, the second air inlet portion can be disposed in a long interval, and thus a greater amount of outside air can be supplied to the burner. Thus, the complete combustion of the burner can be effectively achieved.

[0055] In addition, in the present application, the second air inlet portion can be disposed between the lower end portion of the heating device and the housing and between the upper end portion of the heating device and the housing, respectively. This structure allows the outside air to be introduced from various directions, and thus a sufficient amount of air required for the burner to perform the combustion function can be provided.

[0056] Further, in the present application, the second air inlet portion can be disposed at the portion where the heating device and the housing are spaced apart from each other. In this way, the second air inlet portion is formed at the spaced portion between the two components, and thus an additional pipe or an additional air supply device does not need to be provided in the cooking apparatus in order to implement the second air inlet portion. Accordingly, the present application has the effect of a simple structure for implementing the second air inlet portion and reduced manufacturing costs.

[0057] In addition, in the present application, the second air inlet portion can be disposed along the surface of the housing. The outside air moving along the surface of the housing can be naturally guided to the second air inlet portion. Thus, the smooth supply of the secondary air can be achieved.

[0058] Further, the heating device of the present application can be disposed in the installation space formed between the frame defining the cooking chamber and the housing surrounding the frame. Since the outside air flows in the installation space to cool the surface of the heating device, the cooling performance of the heating device can be improved, and the durability can be increased.

[0059] In addition, the outside air flowing in the installation space can flow into the heating device through the second air inlet portion from the end position of the air inflow passage blocked by the housing. Thus, the outside air first passes through the surface of the heating device along the air inflow passage and then flows into the second air inlet portion, and thus the cooling function of the outside air can be effectively achieved.

[0060] Further, in the present application, the lower portion of the heating device can be provided with a concave-convex portion. Since the concave-convex portion protrudes in the direction of the air inflow passage of the outside air, the contact area with the outside air can be increased. Through the heat exchange between the outside air and the concave-convex portion, the heating device can be more effectively cooled.

[0061] Further, in the present application, since the heating device is arranged at the lower portion of the cooking chamber, the volume of the cooking chamber is not reduced by the space occupied by the heating device. Therefore, the size of the cooking chamber can be relatively larger, and the cooking apparatus can be miniaturized based on the same size of the cooking chamber.

[0062] In addition, in the present application, the circulating device and the heating device can be arranged at different heights from each other in the vertical direction. In this way, the flow path inside the circulating device and the flow path inside the heating device can form flow paths that are continuous with each other in the vertical direction. The air heated by the heating device can be supplied to the cooking chamber after rising along the continuous flow paths by natural draft. Therefore, even in the state in which the circulating fan does not operate, the heated air can be supplied to the cooking chamber, and thus the present application can provide more diverse cooking modes.

[0063] At this time, in the present application, the heating device is arranged at the lower portion of the circulating device, and the entire lower portion of the circulating device can overlap the upper portion of the heating device. In this way, the length of the circulating device and the heating device in the front-rear direction (the depth direction of the cooking chamber) can be minimized, and thus the cooking apparatus can be miniaturized. In addition, if the entire lower portion of the circulating device overlaps the upper portion of the heating device, the air movement path between the heating device and the circulating device is shortened, and thus heat loss can be reduced.

[0064] Further, in the present application, the heating device can be arranged at the lower portion of the discharge cavity of the circulating device. Thereby, the heat inside the heating device is radiated to the discharge cavity, and the air of the discharge cavity can be supplied to the cooking chamber in a more heated state. Thereby, the thermal efficiency of the cooking apparatus can be improved.

[0065] In addition, since the heating device is not present inside the cooking chamber, the fan cover and other components do not need to be excessively large in order to shield the heating device, and do not need to correspond to the shape of the heating device. Thereby, the freedom of design of the interior of the cooking chamber is improved.

[0066] Further, by arranging the heating device outside the cooking chamber, the radiant heat of the burner is not directly transmitted to the wall surface of the cooking chamber, and thus the durability of the cooking apparatus can be improved.

[0067] In particular, in the present application, the heating device and the circulating device can be coupled to the frame without directly contacting each other. Thereby, the conduction heat transmitted from the heating device to the circulating device is greatly reduced, and thus the energy efficiency of the cooking apparatus can be improved, and the durability of the circulating device can be improved.

[0068] In addition, in the present utility model, the flame hole of the burner can be open to the flow path connected from the heating device to the circulating device. Thus, the flame generated in the burner can be concentrated to the air supplied from the heating device to the circulating device, so that the air inside the cooking chamber can be heated faster to improve the cooking performance.

[0069] Furthermore, since the flame hole of the burner is open to the flow path instead of the wall or shell of the cooking chamber, there is no concern that the peripheral components are overheated by the burner.

[0070] In addition, in the present utility model, since the heating device is arranged at a position away from the cooking chamber, the inflow of food residues and the like into the heating device during the cooking of food can be prevented. Thus, the durability of the heating device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 is a perspective view showing an embodiment of the cooking apparatus of the present utility model.

[0072] Figure 2 is a perspective view showing the inside of the cooking chamber of the oven part constituting an embodiment of the present utility model.

[0073] Figure 3 is a front view showing the inside of the cooking chamber of the oven part constituting an embodiment of the present utility model, with the stove part and the drawer part removed.

[0074] Figure 4 is a rear view showing the rear of the oven part constituting an embodiment of the present utility model, with the stove part and the drawer part removed.

[0075] Figure 5 is a rear view showing the state in which the cover plate is removed from Figure 4 .

[0076] Figure 6 is a perspective view showing the components of the oven part constituting an embodiment of the present utility model.

[0077] Figure 7 is a perspective view showing the fan cover, the partition cover, the fan device, and the heating device among the components of the oven part constituting an embodiment of the present utility model.

[0078] Figure 8 is a front view showing a cross-sectional structure in which a portion of the oven part constituting an embodiment of the present utility model is cut to show the fan device and the heating device.

[0079] Figure 9 is a cross-sectional view taken along the line Figure 2 Ⅸ-Ⅸ’.

[0080] Figure 10is a sectional view of the side structure of the oven portion and the drawer portion constituting an embodiment of the present application.

[0081] Figure 11 is a side view showing, in an enlarged scale, the circulation means and the heating means portion in Figure 10 .

[0082] Figure 12 is a perspective view showing, in an enlarged scale, the circulation means and the heating means portion in Figure 10 .

[0083] Figure 13 is a perspective view showing the structure of the heating means constituting an embodiment of the present application.

[0084] Figure 14 is a perspective view showing the structure of the heating means constituting an embodiment of the present application, viewed from a different angle than Figure 13 .

[0085] Figure 15 is a front view showing the structure of the burner among the components of the heating means constituting an embodiment of the present application.

[0086] Figure 16 is a top view showing the structure of the heating means constituting an embodiment of the present application.

[0087] Figure 17 is a rear view showing the structure of the heating means constituting an embodiment of the present application.

[0088] Figure 18 is a sectional view taken along the line XVIII-XVIII' of Figure 3 .

[0089] Figure 19 is a perspective view showing the configuration of Figure 18 from another angle.

[0090] Figure 20 is a perspective view showing the configuration of Figure 19 , viewed from a different angle than Figure 18 .

[0091] Figure 21 is a sectional view taken along the line XXI-XXI of Figure 3 .

[0092] Figure 22 is a perspective view showing the rear lower structure of the oven portion constituting an embodiment of the present application.

[0093] Figure 23 is a sectional view taken along the line XXIII-XXIII' of Figure 22 .

[0094] Figure 24 is a perspective view showing the rear lower structure of the oven section constituting the second embodiment of the present utility model.

[0095] Figure 25 is a sectional view taken along the line XXV-XXV' of Figure 24

[0096] Figure 26 is a sectional view showing the structure of the heating device constituting the third embodiment of the present utility model.

[0097] Figure 27 is a sectional view showing the structure of the heating device constituting the fourth embodiment of the present utility model.

[0098] Figure 28 is a perspective view showing the structure of the burner and the guide duct among the components of the heating device constituting the fourth embodiment of the present utility model.

[0099] Figure 29 is a perspective view showing the structure of the guide duct among the components of the heating device constituting the fourth embodiment of the present utility model.

[0100] Figure 30 is a side view showing the structure of the guide duct among the components of the heating device constituting the fourth embodiment of the present utility model.

[0101] Figure 31 is a sectional view showing the structure of the heating device constituting the fifth embodiment of the present utility model.

[0102] Figure 32 is a perspective view showing the structure of the burner and the guide duct among the components of the heating device constituting the fifth embodiment of the present utility model.

[0103] Figure 33 is a side view showing the structure of the guide duct among the components of the heating device constituting the fifth embodiment of the present utility model.

[0104] Figure 34 is a plan view showing the structure of the flame guide among the components of the heating device constituting the sixth embodiment of the present utility model.

[0105] Figure 35 is a sectional view showing the structure of the burner and the flame guide among the components of the heating device constituting the sixth embodiment of the present utility model.

[0106] Figure 36 is a plan view showing the structure of the flame guide among the components of the heating device constituting the seventh embodiment of the present utility model.

[0107] Figure 37 ​is a sectional view showing the structure of the burner and the flame guide among the components of the heating device constituting the seventh embodiment of the present application.

[0108] KEY

[0109] 10: housing, 11: front panel, 12: side panel, 13: electrical chamber, 20: back panel, 23: panel opening portion, 28: cover, 30: cooktop, 40: drawer section, 50: door, 60: frame, 61: frame bottom portion, 61a: connection passage, 62: frame side portion, 63: frame top portion, 65: frame back portion 70: partition plate, 71: partition body, 72: partition bend portion, 74: communication hole, 75: first discharge hole, 80: cover plate, 81: cover body, 82: cover bend portion, 84: suction hole, 85: second discharge hole, 90: fan assembly, 93: circulation fan, 100: heating device, 110: burner housing, 111: front plate, 111a: spacing portion, 112: side plate, 113: top plate, 115: back plate, 117: bottom plate, 117a: concave-convex portion, 118: cavity opening portion, 119: combustion air hole, 120: burner, 125: flame hole, 130: flow path guide, 131: guide front portion, 132: guide side portion, 133: guide top portion, 135: guide back portion, 137: guide fence, 140: flame guide, 141: fixing body, 145: guide vane, C: circulation device, CP1: first cooling flow path, CP2: second cooling flow path, GP: heating flow path, SP: air inflow passage, IP1: first air intake portion, IP2: second air intake portion. DETAILED DESCRIPTION

[0110] Hereinafter, some embodiments of the present application will be explained in detail by way of illustrative drawings. Note that, in the process of adding reference numerals to the constituent elements of each drawing, the same reference numeral is given as much as possible even if it is shown on different drawings. In addition, in the process of explaining the embodiments of the present application, in the case where it is judged that the specific explanation of the related known constitution or function will hinder the understanding of the embodiments of the present application, the detailed explanation thereof is omitted.

[0111] The present application relates to a cooking appliance. Here, the cooking appliance can mean an appliance having a cooking chamber S1 inside. The cooking appliance of the present application can be a closed type cooking appliance in which the cooking chamber S1 is opened and closed by a door 50. In the terms explained below, the front direction means the direction toward the user when the user is in front of the cooking appliance. Referring to Figure 1 , the X-axis direction can become the front direction. The Y-axis direction can become the left-right width direction of the cooking chamber S1. The Z-axis direction can become the height direction of the cooking chamber S1. Hereinafter, the explanation is made based on such directions.

[0112] Referring to Figure 1 and Figure 2 , a skeleton of the cooking appliance can be formed by a housing 10. The housing 10 can be regarded as a portion exposed to the outside of the cooking appliance. The housing 10 can have a form of a substantially hexahedral structure. An inner side of the housing 10 can be configured with an oven unit to be described below.

[0113] In the present embodiment, an upper portion of the cooking appliance can be configured with a cook-top unit 30, and a lower portion can be configured with a drawer unit 40. The cook-top unit 30 can constitute an upper portion of the housing 10. The drawer unit 40 can constitute a lower portion of the housing 10. The cook-top unit 30 and the drawer unit 40 can be configured with the oven unit therebetween. As another example, either one of the cook-top unit 30 and the drawer unit 40 can be omitted, or both can be omitted.

[0114] Upon close observation of the structure of the housing 10, the housing 10 can be provided in a form including a substantially regular hexahedral shape. In order to protect a plurality of components provided in an inner space of the housing 10, the housing 10 is formed of a material having a predetermined hardness. An inner side of the housing 10 can be configured with the oven unit. The oven unit can be shielded by the housing 10 and a door 50.

[0115] Referring to Figure 2 , the housing 10 can include a front panel 11, side panels 12, and a back panel 20. The front panel 11 is a portion exposed when the door 50 is opened, and can constitute a front of a frame 60 to be described later. The side panels 12 can cover left and right sides of the frame 60. Referring to Figure 10 , a lower portion of the drawer unit 40 can be configured with a bottom panel 17 constituting the housing 10.

[0116] The front panel 11 can be coupled to a front of the frame 60 to be described below. The front panel 11 can be configured to surround an entrance edge of a cooking chamber S1 provided at an inner side of the frame 60. If the door 50 is closed, a back of the door 50 can be attached to the front panel 11.

[0117] Both sides of the frame 60 can be configured with the side panels 12. The side panels 12 can be configured to be higher than the sides of the frame 60. Thereby, an electrical chamber 13 can be provided between the two side panels 12. The electrical chamber 13 can provide a space in which electrical components are provided, between the cook-top unit 30 and the oven unit. A front of the electrical chamber 13 can have a control panel 55. A structure in which the control panel 55 shields the front of the electrical chamber 13 can be constituted.

[0118] The back panel 20 can be disposed behind the frame 60. The back panel 20 can be combined with the two side panels 12. The back panel 20 can be spaced apart from the back of the frame 60. Thus, the back panel 20 and the back of the frame 60 can be spaced apart from each other. The space thus spaced apart can become a heat insulation space S4 (refer to FIG. 1) in which a heat insulation material is filled. Figure 10 ) The structure will be described again below.

[0119] Referring to Figure 4 , a configuration in which the back panel 20 is viewed from the rear is shown. The surface of the back panel 20 can be provided with a plurality of holes. One portion 25a of the holes can be provided with a motor (not shown) for locking the door 50. Another portion 25b of the holes can be connected with a pipe for supplying fuel to a grill burner H (refer to Figure 8 ) disposed at the upper portion of the cooking chamber S1, or can become a hole for disposing a thermistor (not shown).

[0120] The back panel 20 can be provided with a panel opening portion 23. The panel opening portion 23 can penetrate the back panel 20. The panel opening portion 23 can expose a heating device 100 disposed inside the housing 10. The panel opening portion 23 can be disposed at the same height as the heating device 100. The panel opening portion 23 can be disposed at a lower side than the bottom surface of the frame 60.

[0121] The panel opening portion 23 can be shielded by a shield cover 28. Figure 4 A configuration in which the panel opening portion 23 is shielded by the shield cover 28 is shown. In the present embodiment, a state in which the shield cover 28 does not completely shield the panel opening portion 23 and a portion thereof is open is shown. Through the portion thus opened, a portion of the heating device 100 including a nozzle holder 127 for injecting fuel gas to a burner 120 can be exposed.

[0122] As Figure 5 shown, if the shield cover 28 is removed, a greater portion of the heating device 100 can be exposed to the rear. A greater portion of the burner 120 constituting the heating device 100 can be exposed by the panel opening portion 23. An operator can remove the shield cover 28 to approach the heating device 100, thereby maintaining the heating device 100. In addition, the shield cover 28 can be removed to assemble the burner 120 in the heating device 100.

[0123] As described below, a cavity opening 118 connected to the panel opening 23 is provided in the burner housing 110, and if the cover 28 is removed, the inside of the burner housing 110, i.e., the cooking cavity S5, can be immediately accessed. As another example, the cover 28 can be omitted. As still another example, the cover 28 can be combined with the burner housing 110 instead of the back panel 20. The cover 28 will be described again below.

[0124] Referring again to Figure 1 , the cooktop portion 30 can include a plurality of cooktop burners 35. The cooktop burners 35 can directly heat a container or food, which contains food, using a flame F (see Figure 18 ) generated by burning gas to cook the food. Reference numeral 32 shows a top grate on which a container or the like is placed. As another example, the cooktop portion 30 can include one or more electric heaters. As another example, the cooktop portion 30 can include an induction heating (IH) burner that uses an induced current generated by a magnetic field as a heat source. As another example, the cooktop portion 30 can be omitted.

[0125] The drawer portion 40 can be provided with a drawer handle 45. The drawer portion 40 can slide in the front-rear direction from the housing 10. The drawer portion 40 can function to keep a container or the like, which contains food, at a predetermined temperature. Referring to Figure 10 , a storage space 43 in which a container or the like is stored is shown inside the drawer portion 40. As another example, the drawer portion 40 can be omitted.

[0126] As shown in Figure 1 , the front of the cooktop portion 30 can be provided with a control panel 55. The control panel 55 can be provided with a knob 57 for operating the cooktop portion 30. The control panel 55 can be provided with an operation portion 59 for operating the oven portion and the drawer portion 40. The operation portion 59 can be constituted by a touch panel for indicating the state of the cooking apparatus.

[0127] The door 50 can shield the front of the cooking chamber S1. The door 50 can operate in a pull-down manner in which the upper end rotates up and down about the lower end. As another example, the door 50 can operate in a side swing manner in which the door 50 is opened to the side. The door 50 can have a structure that allows the cooking chamber S1 to be viewed through. For example, the front 52 of the door 50 can have a panel structure of glass material, and a user can observe the inside of the cooking chamber S1 through the door 50. As another example, the cooking chamber S1 can not be viewed through the door 50 from the outside. Reference numeral 53 shows a handle for opening and closing the door 50.

[0128] Referring toFigure 2 The bottom surface of the electric chamber 13 can constitute a top surface portion of the frame 60. The electric chamber 13 can be provided with an exhaust pipe 68. The exhaust pipe 68 can be provided in order to exhaust combustion gas generated in the process of cooking food inside the cooking chamber S1 to the outside of the cooking apparatus. A lower end portion of the exhaust pipe 68 can be connected to an exhaust port 64 which is opened in the top surface portion of the frame 60, and an upper end portion can be disposed on the upper side of the back of the cooking apparatus.

[0129] Referring to Figure 3 Observing the structure of the frame 60, the frame 60 can have a substantially hexahedral structure. The inside of the frame 60 can be provided with the cooking chamber S1. The cooking chamber S1 can also have a substantially hexahedral structure as the frame 60. The frame 60 can be shielded by the housing 10 and the door 50. Except for the surface of the frame 60 of the cooking chamber S1, most of the surface can be shielded by the housing 10.

[0130] The frame 60 can include a frame bottom portion 61 constituting the bottom surface of the cooking chamber S1, a frame side portion 62 constituting the side surface of the cooking chamber S1, a frame top portion 63 constituting the top surface of the cooking chamber S1, and a frame back portion 65 constituting the back surface of the cooking chamber S1. Also, the front of the frame 60 can be open to expose the cooking chamber S1.

[0131] In the present embodiment, a circulation device C to be described below can be disposed inside the frame 60. Here, the inside of the frame 60 refers to a space surrounded by the frame bottom portion 61, the frame side portion 62, the frame top portion 63, and the frame back portion 65. The cooking chamber S1 can also be disposed inside the frame 60. The front of the circulation device C can be provided with the cooking chamber S1.

[0132] In addition, a heating device 100 to be described below can be disposed outside the frame 60. Here, the outside of the frame 60 refers to the outside of the space surrounded by the frame bottom portion 61, the frame side portion 62, the frame top portion 63, and the frame back portion 65. Thus, in the present embodiment, the circulation device C and the heating device 100 are disposed inside and outside, respectively, with the frame 60 as a reference.

[0133] Referring again to Figure 3If the door 50 is opened, the inside of the cooking chamber S1 can expose a cover plate 80 constituting a circulation device C to be described later. The cover plate 80 can be disposed in front of the frame back portion 65 constituting the back of the cooking chamber S1. The cover plate 80 is coupled to the frame back portion 65, thereby being able to shield a partition plate 70 and a circulation fan 93 to be described later. In this way, the circulation device C is disposed in the inside of the cooking chamber S1, and can function to circulate the air in the inside of the cooking chamber S1. For reference, the suction hole 84 of the cover plate 80 is used to suck the air in the inside of the cooking chamber S1, and the second discharge hole 85 discharges the heated air again into the inside of the cooking chamber S1.

[0134] As shown in Figure 3 , the heating device 100 can be disposed in the lower portion of the frame 60. More precisely, the heating device 100 can be disposed in the lower side compared to the frame bottom portion 61. The circulation device C is disposed in the inside of the cooking chamber S1, and the heating device 100 is disposed in the lower portion of the frame 60 outside the cooking chamber S1. Referring to Figure 10 , the heating device 100 can be disposed between the frame bottom portion 61 and the drawer cover 47 constituting the top of the drawer portion 40. If the drawer portion 40 is omitted, the heating device 100 can be disposed between the frame bottom portion 61 and the bottom panel 17.

[0135] Figure 7 The back panel 20, the frame 60, the circulation device C, and the heating device 100 constituting the present utility model are shown in a state of being disassembled. Observing the circulation device C, the circulation device C can suck the air in the inside of the cooking chamber S1 and mix it with the high-temperature air received from the heating device 100. The circulation device C can discharge the air thus mixed into the inside of the cooking chamber S1. This process is performed simultaneously and continuously, so that the air in the inside of the cooking chamber S1 can be circulated.

[0136] The circulation device C and the heating device 100 can be connected by a connection passage 61a (refer to Figure 11) connection. In the present embodiment, the connection passage 61a is formed through the frame bottom surface portion 61. With the connection passage 61a as a reference, an upper portion can be provided with the circulation device C, and a lower portion can be provided with the heating device 100. The connection passage 61a can be provided at a rear portion of the frame bottom surface portion 61 near the frame back surface portion 65. As another example, the connection passage 61a can be provided at both side portions of the frame bottom surface portion 61 near the frame side surface portions 62. As another example, the connection passage 61a can be provided at the frame side surface portions 62. In this way, the heating device 100 can be provided at an opposite side of the circulation device C with the frame side surface portions 62 interposed therebetween.

[0137] The circulation device C can be provided inside the cooking chamber S1. In the present embodiment, the circulation device C is provided in front of the back surface panel 20. The circulation device C can suck in air from the front of the cooking chamber S1 to the rear of the cooking chamber S1 (refer to the X-axis direction of FIG. 1) and then discharge the air to the side. A circulation fan 93 is provided in the circulation device C, thereby enabling the suction and discharge functions. However, as will be described below, in the present embodiment, since the heating device 100 can cause heated air to rise by natural draft, even if the circulation fan 93 does not operate, heated air can be supplied to the cooking chamber S1. Figure 1

[0138] The inside of the circulation device C can be provided with a circulation cavity SA, as will be described below with reference to FIG. 2. The circulation cavity SA can be connected to the cooking chamber S1. Air sucked in from the cooking chamber S1 can exchange heat with air heated by the heating device 100 in the circulation cavity SA. The heat-exchanged air can be discharged again to the cooking chamber S1. Figure 9 The circulation cavity SA can form an upper flow path connected to the cooking chamber S1. The upper flow path refers to a path in which air sucked in from the cooking chamber S1 is discharged again to the cooking chamber S1. A combustion cavity S5 inside the heating device 100, which will be described below, can form a lower flow path that delivers air heated by the burner 120 to the upper flow path. At this time, the upper flow path and the lower flow path can be connected to each other in the height direction of the frame 60 through the connection passage 61a provided in the frame bottom surface portion 61. Here, the height direction of the frame 60 refers to the up-down direction with reference to the drawing, indicating the Z-axis direction of FIG. 1. Such a flow path structure will be described again in detail below.

[0139] Figure 1 The circulation cavity SA can form an upper flow path connected to the cooking chamber S1. The upper flow path refers to a path in which air sucked in from the cooking chamber S1 is discharged again to the cooking chamber S1. A combustion cavity S5 inside the heating device 100, which will be described below, can form a lower flow path that delivers air heated by the burner 120 to the upper flow path. At this time, the upper flow path and the lower flow path can be connected to each other in the height direction of the frame 60 through the connection passage 61a provided in the frame bottom surface portion 61. Here, the height direction of the frame 60 refers to the up-down direction with reference to the drawing, indicating the Z-axis direction of FIG. 1. Such a flow path structure will be described again in detail below.

[0140] ​​The circulation device C can include a partition plate 70 and a cover plate 80. The cover plate 80 can be disposed in front of the rear panel 20. The partition plate 70 can be disposed between the cover plate 80 and the rear panel 20. The partition plate 70 and the cover plate 80 have similar shapes, and the cover plate 80 can be relatively larger in size. The cover plate 80 can be coupled to the frame rear portion 65 in a state of surrounding and shielding the partition plate 70.

[0141] The partition plate 70 is of a metal material, and a partition body 71 can form a skeleton. The partition body 71 can have a substantially plate shape. The partition body 71 can be provided with a partition bent portion 72 at an edge thereof. The partition bent portion 72 can constitute a front-rear direction thickness of the partition plate 70. A partition fastening end 73 disposed at an end of the partition bent portion 72 can be fastened to the frame rear portion 65 in a state of being coincident with a cover fastening end 83 of the cover plate 80.

[0142] The partition body 71 can be provided with a communication hole 74. The communication hole 74 can be formed by penetrating the partition body 71 in a front-rear direction. The communication hole 74 can have a substantially circular shape. The communication hole 74 can be connected to a suction hole 84 of the cover plate 80. To this end, the communication hole 74 can be disposed at a position corresponding to a rear of the suction hole 84. Since a circulation fan 93 is disposed in the communication hole 74, the communication hole 74 can also be regarded as a fan installation space.

[0143] The partition bent portion 72 can be provided with a plurality of first discharge holes 75. The first discharge holes 75 can be formed by penetrating the partition bent portion 72. The first discharge holes 75 can be opened in a direction different from a direction in which the communication hole 74 is opened. In the present embodiment, the first discharge holes 75 can be formed in a lateral direction. The first discharge holes 75 can be connected to second discharge holes 85 of the cover plate 80. Air heated by the heating device 100 can be supplied to the inside of the cooking chamber S1 through the first discharge holes 75 and the second discharge holes 85.

[0144] The partition plate 70 can partition a space between the cover plate 80 and the frame rear portion 65. A circulation cavity SA can be provided between the partition plate 70 and the frame rear portion 65, and the circulation cavity SA can be partitioned into two parts by the partition plate 70. More specifically, as shown in FIG. 2, the circulation cavity SA can be partitioned into a first circulation cavity SA1 and a second circulation cavity SA2 by the partition plate 70. Figure 9As shown, the circulation cavity SA can be divided into a heating cavity S2 closer to the front of the cooking chamber S1 and a discharge cavity S3 closer to the rear of the cooking chamber S1 based on the partition plate 70. Here, the heating cavity S2 can be a space in which air heated by the heating device 100 and air drawn from the cooking chamber S1 are mixed. The discharge cavity S3 can be a space in which the air mixed in the heating cavity S2 is discharged again to the cooking chamber S1. Of course, although a portion of the air in the cooking chamber S1 can flow directly into the discharge cavity S3, most of the air inside the discharge cavity S3 can be discharged to the cooking chamber S1 if the circulation fan 93 is operated.

[0145] The cover plate 80 is a metal material, and the cover body 81 can form a skeleton. The cover body 81 can have a substantially plate-like structure. The cover body 81 can be provided with a cover bending portion 82 at the edge thereof. The cover bending portion 82 can form the front-rear direction thickness of the cover plate 80. A cover fastening end 83 provided at the end of the cover bending portion 82 can be fastened to the frame back portion 65 in a state of coinciding with the partition fastening end 73 of the partition plate 70.

[0146] On the other hand, the lower end of the cover plate 80 and the lower end of the partition plate 70 can also be supported by the frame 60, respectively. The structure in which the lower end of the cover plate 80 and the lower end of the partition plate 70 are supported by the frame 60 will be described in detail when the structure in which the heating device 100 is supported by the frame 60 is described below.

[0147] Since the cover plate 80 is coupled to the frame back portion 65 in a state of surrounding the partition plate 70, the partition plate 70 can be shielded by the cover plate 80. As shown, Figure 3 If the cooking chamber S1 is viewed from the front, it becomes a state in which only the cover plate 80 is exposed.

[0148] The cover body 81 can be provided with a suction hole 84. The suction hole 84 can be formed to penetrate the cover body 81 in the front-rear direction. The suction hole 84 can be a hole for suctioning air inside the cooking chamber S1. The air suctioned into the suction hole 84 can flow into the heating cavity S2. In the present embodiment, the suction hole 84 has a substantially circular structure. The suction hole 84 is formed in a louver shape, thereby being able to shield the inside of most of the suction hole 84, that is, the partition plate 70. As another example, the suction hole 84 can also have a simple circular hole or various shapes other than a circular shape like the communication hole 74.

[0149] The suction hole 84 can be connected with the communication hole 74 of the partition plate 70. To this end, the suction hole 84 can be disposed at a position corresponding to the front of the communication hole 74. The rear of the suction hole 84 is provided with a circulating fan 93, so that air can be sucked through the suction hole 84.

[0150] The cover bent portion 82 can be formed with a plurality of second discharge holes 85. The second discharge holes 85 can be formed through the cover bent portion 82. The second discharge holes 85 can be opened in a direction different from the direction in which the suction hole 84 is opened. In the present embodiment, the second discharge holes 85 can be formed in the lateral direction. The second discharge holes 85 can be connected with the first discharge holes 75 of the partition plate 70. Air heated by the heating device 100 can be supplied to the inside of the cooking chamber S1 through the first discharge holes 75 and the second discharge holes 85.

[0151] In the present embodiment, the first discharge holes 75 and the second discharge holes 85 are respectively disposed on the side surface and the inclined surface of the partition bent portion 72 and the cover bent portion 82. As another example, the first discharge holes 75 and the second discharge holes 85 can be respectively disposed on the top surface and the bottom surface of the partition bent portion 72 and the cover bent portion 82.

[0152] Figure 8 A state in which a portion of the cover plate 80 is cut is shown. The inner side of the cover plate 80 can be provided with the circulating fan 93. If the circulating fan 93 operates, external air can be guided to the side of the heating device 100 (arrow ① direction). Air heated by the heating device 100 can rise in the direction of the circulating device C (arrow ② direction). Air transferred to the direction of the circulating fan 93 (arrow ③ direction) due to the suction force of the circulating fan 93 can be discharged to the outside (arrow ④ direction), that is, the inside of the cooking chamber S1, by the rotation of the circulating fan 93.

[0153] As such, in the present embodiment, the heating device 100 is disposed at the lower portion of the circulating device C. Air heated by the heating device 100 can (i) rise by the suction force of the circulating fan 93, and (ii) rise by natural draft. That is, if the temperature of air is increased by the heating device 100, the volume expands, the density decreases, and the buoyancy increases, so as to rise. More specific structures related to the circulation of air will be described again below.

[0154] The circulating fan 93 can constitute a fan assembly 90 in combination with the fan motor 91. The fan assembly 90 can include the fan motor 91, the circulating fan 93, the rotating shaft 92, and the motor cooling fan 95. At this time, the fan motor 91 and the motor cooling fan 95 can be disposed outside the housing 10. More specifically, the fan motor 91 and the motor cooling fan 95 can be disposed at the rear surface of the rear surface panel 20 constituting the housing 10. Referring to Figure 5 It can be seen that the fan motor 91 is disposed at the rear surface panel 20 and exposed to the rear.

[0155] As shown in Figure 7 the center of the fan motor 91 can be provided with a motor center portion 91a to which the rotating shaft 92 is coupled. The fan motor 91 is provided with a fan bracket 91b which can be fixed to the rear surface panel 20. The motor cooling fan 95 can be coaxially rotated with the circulating fan 93 through the rotating shaft 92. The motor cooling fan 95 can cool the fan motor 91. As another example, the motor cooling fan 95 can be omitted.

[0156] As shown in Figure 8 the circulating fan 93 can be disposed in front of the frame rear portion 65. The circulating fan 93 is disposed at the opposite side of the motor cooling fan 95 and the fan motor 91 with the frame rear portion 65 and the rear surface panel 20 interposed therebetween. The rotating shaft 92 can connect between the circulating fan 93 and the fan motor 91 through the panel through hole 24 of the rear surface panel 20 and the shaft through hole (not shown) of the frame rear portion 65, respectively.

[0157] Referring to Figure 9 In the present embodiment, the circulating fan 93 can be disposed in the circulating cavity SA. The circulating fan 93 can be regarded as a part of the circulating device C. In addition, the fan assembly 90 as a whole can also be regarded as a part of the circulating device C. As another example, the fan assembly 90 can be disposed in the side surface panel 12 or the top surface panel instead of the rear surface panel 20. As another example, the fan assembly 90 can be omitted.

[0158] Next, the heating device 100, which is capable of heating air, is observed. The heating device 100 is capable of (i) heating air flowing in from the outside and (ii) heating air inside the cooking chamber S1. In the present embodiment, since the heating device 100 is disposed outside the cooking chamber S1, it is capable of heating most of the air flowing in from the outside. However, if a portion of the air inside the cooking chamber S1 flows into the heating device 100, the heating device 100 is also capable of heating the inside air.

[0159] The heating device 100 can be disposed outside the frame 60. In the present embodiment, the heating device 100 can be disposed on the lower side of the frame bottom surface portion 61. Referring to Figure 10 , it can be disposed between the frame bottom surface portion 61 and the bottom surface panel 17. More precisely, the heating device 100 can extend in one direction along the rear edge of the lower portion of the frame 60.

[0160] Referring to Figure 10 , a setting space IS can be disposed between the frame bottom surface portion 61 and the bottom surface panel 17. The heating device 100 can be disposed in the setting space IS. The heating device 100 can be disposed in the rear of the setting space IS, i.e., close to the back surface panel 20.

[0161] In this way, if the heating device 100 is disposed outside the frame 60, the heating device 100 does not intrude into the cooking chamber S1. Therefore, the space of the cooking chamber S1 does not become narrow due to the heating device 100, and can be made wide. In particular, in the present embodiment, since the heating member such as the burner 120 and the member for assisting the heating member such as the heat shield are omitted from the circulation device C, the space in the rear of the cooking chamber S1 can be made wide.

[0162] Since the setting space IS is an empty space, even if the heating device 100 is disposed, the overall size of the cooking appliance can not increase. In addition, the setting space IS can become an outside air inflow portion. Thus, the air flowing in through the setting space IS can cool the bottom surface of the heating device 100 in the process. This structure will be described again below.

[0163] Referring to Figure 10, the burner 120 of the heating device 100 can generate a flame in a forward direction, i.e., toward the door 50 (arrow ① direction). Here, the direction in which the burner 120 generates a flame can be referred to as a first direction. Also, the circulation device C and the heating device 100 can be disposed in a second direction (arrow ② direction) different from the first direction. Thus, the air heated by the heating device 100 heats the air in the front space (combustion chamber S5, refer to Figure 18 ) inside the heating device 100, and the heated air rises upward and can move to the heating chamber S2. In the present embodiment, the first direction and the second direction are formed to be orthogonal to each other. As another example, the first direction can also be a direction inclined upward from the horizontal direction.

[0164] Refer to Figure 11 , the flow of air based on the circulation device C and the heating device 100 is indicated by arrows. First, the flow of air based on the circulation device C is observed, and if the circulation fan 93 is operated, the air of the cooking chamber S1 can be drawn in the direction of the circulation fan 93 (arrow ① direction).

[0165] Meanwhile, the air of the combustion chamber S5 heated by the heating device 100 rises in the direction of the heating chamber S2 of the circulation device C (arrow ② direction). The heated air rising to the heating chamber S2 can be mixed with the air drawn from the cooking chamber S1. At this time, the temperature of the air drawn from the cooking chamber S1 is relatively low, and the air rising from the heating device 100 has been heated, and thus the temperature is relatively high. If the two kinds of air are mixed and heat-exchanged, the mixed air can be formed to have a higher temperature than the air flowing from the cooking chamber S1.

[0166] At this time, as explained before, the air heated by the heating device 100 can rise in the direction of the heating chamber S2 of the circulation device C (arrow ② direction) using natural draft. Thus, even if the circulation fan 93 is not operated, the heated air can be supplied to the cooking chamber S1.

[0167] This mixed air moves to the discharge chamber S3 through the communication hole 74 of the partition plate 70 (arrow ③ direction). The air entering the discharge chamber S3 can be discharged again to the cooking chamber S1 (arrow ④ direction) through the first discharge hole 75 and the second discharge hole 85 connected to each other. At this time, the discharge of the mixed air to the cooking chamber S1 again can be accomplished by the operation of the circulation fan 93, but can also be achieved using the pressure difference of the air rising in the combustion chamber S5 by natural draft.

[0168] On the other hand, if the burner 120 operates to heat air of the cooking chamber S5, the heating device 100 itself can be overheated. In addition, the frame 60 disposed at the upper portion of the heating device 100 can be deformed due to high heat or the enamel coating of the frame 60 can be damaged. To prevent this, in the present embodiment, external air can be used to cool the heating device 100 and the frame 60.

[0169] Referring to Figure 11 , external air passing through the lower portion of the heating device 100 is indicated by an arrow ⑤. The external air can move along the lower surface of the heating device 100. This external air not only serves as secondary air supplied to the burner 120, but also functions to cool.

[0170] External air cooling the bottom surface of the heating device 100 as it passes through the bottom surface of the heating device 100 can flow into the interior of the heating device 100 (arrow ⑥). More specifically, as shown in an enlarged view of Figure 11 , external air can flow into the interior of the heating device 100 from a gap, i.e., a second air inlet portion IP2, formed between the heating device 100 and the back panel 20.

[0171] A portion of this air is heated by the heating device 100 and moves to the heating chamber S2, but another portion can move along cooling flow paths CP1, CP2 (refer to Figure 18 ) divided by flow path guides 130 of the heating device 100. More specifically, a portion of air for cooling moves along the lower portion of the burner 120 in the interior of the heating device 100 and then rises through a space CP1 formed by a partition portion 111a (refer to Figure 13 ) in the process, thereby preventing overheating of the bottom surface of the heating device 100, the front surface of the heating device 100, and the lower portion of the frame 60 (refer to Figure 11 arrow ⑦).

[0172] Meanwhile, another portion of air for cooling can move along the upper portion of the burner 120 to prevent overheating of the top surface of the heating device 100, the flame guide 140, and the lower portion of the frame 60 (refer to Figure 11 arrow ⑧). At this time, air flowing toward the upper portion of the cooking chamber S1 (arrow ⑧ of Figure 11 ) can also flow in through another second air inlet portion IP2 disposed at the upper portion of the heating device 100 (refer to Figure 19 arrow ⑤'). This structure is described again below.

[0173] Referring to Figure 12, the inside structure of the structure of the circulating device C and the heating device 100 is shown. The air sucked into the suction hole 84 of the cover plate 80 enters the heating cavity S2 (arrow ① direction), and the heating cavity S2 is filled with air heated by the heating device 100. Thus, the air of the cooking chamber S1 can be heated during moving through the suction hole 84 toward the communication hole 74. On the other hand, the motor cooling fan 95 constituting the fan assembly 90 can rotate together with the circulating fan 93, and air is blown toward the fan motor 91 (arrow ② direction), so that the fan motor 91 can be cooled.

[0174] The flame generated by the burner 120 can heat the air of the combustion cavity S5. At this time, the flame generated in the burner 120 can be guided in the generation direction by the flame guide 140 to be described below. Arrow ③ indicates the direction in which the flame is guided by the flame guide 140. Such a direction can naturally be toward the heating cavity S2. More accurately, the air of the combustion cavity S5 heated by combustion heat can pass through the flow path formed by the flame guide 140 and the flow path guide 130 to be described below. Also, the air rising along the flow path can move to the heating cavity S2 through the connection passage 61a provided to the frame bottom surface portion 61.

[0175] In the present embodiment, the front-rear length L2 of the heating device 100 is longer than the front-rear length L1 of the lower portion of the circulating device C. Here, the front-rear direction refers to the direction from the door 50 toward the frame back surface portion 65. In other words, the front-rear direction is the direction in which the cover plate 80 and the partition plate 70 are combined with each other, and can be regarded as the axial direction of the rotation shaft 92.

[0176] If the front-rear direction length of the heating device 100 is longer, the upper region of the heating device 100 can include the entire lower region of the circulating device C. As shown in Figure 12 , the entire lower portion of the circulating device C can overlap with the upper portion of the heating device 100. Thus, the front-rear direction length of the entire circulating device C and the heating device 100 can become the front-rear direction length of the heating device 100, and thus the front-rear direction length occupied by the circulating device C and the heating device 100 in the cooking apparatus can be minimized.

[0177] In addition, if the lower portion of the circulation device C and the upper portion of the heating device 100 overlap each other, a movement path between the combustion chamber S5 and the circulation chamber SA can be minimized. If the movement path between the combustion chamber S5 and the circulation chamber SA is shortened, heat loss is reduced, and thus the efficiency of the cooking apparatus can be improved. In addition, since the discharge chamber S3 overlaps the combustion chamber S5, heat of the combustion chamber S5 can be transferred to the discharge chamber S3. The air of the discharge chamber S3 is heated by the thus transferred heat, and thus the thermal efficiency of the cooking apparatus can be improved.

[0178] In the present embodiment, the upper portion of the heating device 100 can overlap the lower portion of the circulation device C, and can not overlap the bottom of the cooking chamber S1. Thus, heat inside the heating device 100 can not directly heat the bottom surface of the cooking chamber S1, and at the same time, heat of the heating device 100 can be concentrated to the circulation device C.

[0179] Referring to Figure 11 The burner 120 can be disposed at a position beyond the range overlapping the heating chamber S2, with reference to the extension direction of the flow path in which the combustion chamber S5 and the heating chamber S2 are connected to each other. Here, the extension direction of the flow path refers to the up-down direction, i.e., the direction in which the circulation device C and the heating device 100 are stacked. The burner 120 is disposed to be inclined toward the rear direction, i.e., the direction of the back panel 20, with reference to the extension direction of the flow path, and thus can not overlap the heating chamber S2.

[0180] All or a part of the burner 120 can be disposed at a position overlapping the discharge chamber S3, with reference to the extension direction of the flow path in which the combustion chamber S5 and the heating chamber S2 are connected to each other. As shown in Figure 11 A part of the burner 120 can be disposed to overlap the discharge chamber S3 in the up-down direction.

[0181] In the present embodiment, the heating device 100 can protrude more toward the rear direction, i.e., the direction of the back panel 20, than the circulation device C. Referring to Figure 11 and Figure 12Although the heating device 100 protrudes to a position very close to the surface of the back panel 20, the circulation device C can be relatively spaced apart from the surface of the back panel 20 in the front direction (left side in the drawing). The portion of the heating device 100, i.e., the extension (not assigned a reference numeral), which protrudes more than the circulation device C can be utilized as an inflow space for inflowing external air into the interior of the heating device 100. External air can be smoothly inflowed to the combustion chamber S5 through the upper and lower portions of the extension of the heating device 100, which protrudes more than the circulation device C. As will be described below, the portion of the heating device 100 and the back panel 20, which face each other, can be spaced apart by a predetermined distance to form an inflow path through which external air can be inflowed to the combustion chamber S5.

[0182] Referring to Figure 13 to Figure 17 , the heating device 100 is observed. The heating device 100 can internally constitute a combustion chamber S5, which can be provided with a burner 120. The burner 120 generates a flame using gas, thereby being able to heat air of the combustion chamber S5. The heating device 100 can function to heat air of the combustion chamber S5 and deliver it to the heating chamber S2.

[0183] At this time, the combustion chamber S5 can form a lower flow path through which air heated by the burner 120 is delivered to the upper flow path. The upper flow path can be regarded as a path through which air moves in the interior of the circulation chamber SA. In the present embodiment, the upper flow path and the lower flow path can be connected to each other in the height direction of the frame 60 by a connection passage 61a provided to the frame bottom portion 61.

[0184] The skeleton of the heating device 100 can be formed by a burner case 110. The burner case 110 can have a substantially hexahedral structure. The burner case 110 can be formed of a metal material having high heat resistance. A portion of the top surface of the burner case 110 and the back surface thereof can be open. The open portion of the top surface of the burner case 110 can be shielded by the frame bottom portion 61. The open back surface of the burner case 110 is formed with a chamber opening portion 118, which can be shielded by the shielding cover 28 described above. Such a structure will be described again below.

[0185] Observing the structure of the burner housing 110, the burner housing 110 may be equipped with a front plate 111 forming the front of the combustion chamber S5. The burner housing 110 may be equipped with side plates 112 forming the sides of the combustion chamber S5. The burner housing 110 may be equipped with a top plate 113 forming the top surface of the combustion chamber S5. The burner housing 110 may be equipped with a bottom plate 117 forming the bottom surface of the combustion chamber S5. The front plate 111, side plate 112, top plate 113, and bottom plate 117 may be formed by bending a metal sheet. As another example, the burner housing 110 may also be formed by joining multiple components by welding or other methods, or by assembling them with fasteners such as screws.

[0186] The front plate 111 may be provided with a spacer portion 111a. The spacer portion 111a may be formed by a portion of the front plate 111 protruding into the combustion chamber S5. The cross-section of the front plate 111 may have an uneven structure due to the spacer portion 111a. In this embodiment, a plurality of spacer portions 111a may be arranged at intervals along the length direction of the front plate 111, i.e., the extension direction of the burner 120.

[0187] The spacer portion 111a can be closely attached to the surface of the guide front portion 131 of the flow path guide 130 disposed in the combustion chamber S5. The spacer portion 111a is separated from the surface of the guide front portion 131 by another adjacent spacer portion 111a, thereby forming a channel. This channel can be called a cooling flow path CP1. If the air at the bottom side of the combustion chamber S5 that is not heated by the burner 120 or is less affected by the burner 120 in the air flowing into the outside of the combustion chamber S5 rises through the cooling flow path CP1, it will not only cool the surface of the front plate 111 and the flow path guide 130, but also cool the bottom part 61 of the frame. In order to distinguish it from the cooling flow path CP2, which will be described below, the cooling flow path CP1 is referred to as the first cooling flow path CP1.

[0188] The spacer portion 111a may extend to the upper end of the front panel 111, but is only disposed to the upper part of the lower end of the front panel 111. (Refer to...) Figure 19 The path indicated by arrow ⑦ can form a continuous path from the front of the base plate 117 and the lower part of the front plate 111 (excluding the spacer 111a) connected to each other to the first cooling flow path CP1, which is disposed between the surface of the front portion 131 of the guide and the back surface of the front plate 111. External air can pass through this path. As another example, the spacer 111a can also protrude from the front portion 131 of the guide toward the front plate 111, instead of protruding from the front plate 111.

[0189] Thus, the surface of the combustor case 110 opposite to each other and the surface of the flow path guide 130 can form a part of the cooling flow path CP1, CP2 in the height direction of the combustion chamber S5.

[0190] Referring again to Figure 13 , the side plate 112 can be provided with a bracket hole 112a through which the bracket portion 129 of the combustor 120 passes. The bracket portion 129 that has passed through the bracket hole 112a can be fixed to the frame 60. As a reference, in the present embodiment, the combustor 120 can be held in a state fixed by the bracket portion 129 and a combustor fixing plate 128 of the combustor 120 to be described below.

[0191] The top plate 113 can be provided with an interference avoidance portion 113a. The interference avoidance portion 113a can be a portion of the top plate 113 omitted so that the combustion chamber S5 is exposed. The interference avoidance portion 113a serves to prevent interference with a structure (not shown) protruding from the lower portion of the frame 60.

[0192] At this time, in order to form the interference avoidance portion 113a, a portion of the top plate 113 can be cut and then bent downward. The portion thus bent can become a fixing rib 113b. Referring to Figure 21 , the fixing rib 113b can be combined with the combustor fixing plate 128 provided to the combustor 120. As a result, one end portion of the combustor 120 can be supported by the fixing rib 113b.

[0193] A portion of the top plate 113 adjacent to the interference avoidance portion 113a can be provided with a top surface opening portion 116. The top surface opening portion 116 can be a shape in which a portion of the top plate 113 is open in the up-down direction. The top surface opening portion 116 can be formed longer in the extension direction of the combustor 120. The top surface opening portion 116 can be formed by bending a portion of the top plate 113 upward after being cut.

[0194] The frame back portion 65 can cover the top surface opening portion 116. Referring to Figure 19 , a portion bent forward from the lower end of the frame back portion 65 can cover the top surface opening portion 116. The portion bent forward from the lower end of the frame back portion 65 can overlap the upper portion of the frame bottom portion 61. The distal end of the frame back portion 65 can be bent downward again to form a flow path inlet end 65a. The structure of the flow path inlet end 65a will be described again below.

[0195] A portion of the top plate 113 can be bent to form a case support 115. A space that is emptied as the case support 115 is bent can become the top surface opening portion 116. The case support 115 can fix the heating device 100 to the frame 60. The heating device 100 can be supported by the frame 60 by the case support 115 being coupled to the frame 60. Referring to Figure 18 and Figure 10 , it can be seen that the case support 115 is in close contact with the frame back portion 65. In this state, the case support 115 can be fixed to the frame 60 using a fastener such as a screw (not shown). Reference numeral B2 shows a second coupling portion in which the case support 115 is coupled to the frame back portion 65. Thus, in the present embodiment, the heating device 100 can be coupled to the frame 60 and supported.

[0196] More specifically, the heating device 100 can be coupled to one side of the surface of the frame back portion 65 that faces the back panel 20. In contrast, the circulation device C can be fixed to the other side of the surface of the frame back portion 65 that faces the cooking chamber S1. Thus, the circulation device C is fixed to a first side of the wall surface of the frame 60 that faces the cooking chamber S1 to form a first coupling portion B1, and the heating device 100 is fixed to a second side of the frame 60 that is opposite the first side to form a second coupling portion B2.

[0197] More specifically, as described above, in the present embodiment, the circulation device C can also be fixed to the frame 60. The cover fastening end 83 disposed at the end of the cover bent portion 82 is fastened to the frame back portion 65 in a state of being in register with the division fastening end 73 of the division plate 70. At the same time, the lower end portion of the division plate 70 and the lower end portion of the cover plate 80 can also be supported by the frame 60, respectively. Referring to Figure 18 , the lower end bent portion 71a of the division plate 70 can be in close contact with the upper portion of the frame back portion 65 to form a first coupling portion B1 (see Figure 19 ). In addition, the lower end bent portion 81a of the cover plate 80 can be in close contact with the frame bottom portion 61 to form a first coupling portion B1.

[0198] Thus, the heating device 100 and the circulation device C can be supported in combination with the frame 60, respectively. The circulation device C and the heating device 100 are fixed to the surface of the frame 60 at different positions from each other, respectively. Since the heating device 100 is supported by the frame 60, it can not depend on the circulation device C for installation. Thus, the heating device 100 can not be in direct contact with the circulation device C. That is, the heating device 100 can be fixed to the frame 60 in a state that the surface of the circulation device C and the surface of the heating device 100 are not in contact with each other. Thus, the amount of radiant heat generated at the surface of the heating device 100 transferred to the circulation device C is reduced, and the flame of the burner 120 can be concentrated to the air of the heating combustion chamber S5.

[0199] Referring again to Figure 14 , the back surface of the burner case 110 can be open to form a cavity opening portion 118. The cavity opening portion 118 can have a substantially quadrangular shape around the edges of the top plate 113, the bottom plate 117, and the side plate 112. The cavity opening portion 118 can be open toward the back surface panel 20. Although the cavity opening portion 118 is connected with the panel opening portion 23 of the back surface panel 20, it can be covered by the shielding cover 28.

[0200] Referring to Figure 19 , the bottom plate 117 can be provided with a concave-convex portion 117a. In the present embodiment, the concave-convex portion 117a is provided at the lower portion of the burner 120. The concave-convex portion 117a can be formed in a state that a portion of the bottom plate 117 is bent. The concave-convex portion 117a increases the rigidity of the bottom plate 117, thereby being capable of preventing the deformation of the bottom plate 117 due to the high temperature of the combustion chamber S5.

[0201] The concave-convex portion 117a can increase the contact area with the air passing through the outside of the lower portion of the burner case 110. The air passing through the outside of the burner case 110 can be in heat exchange with the concave-convex portion 117a, in which the bottom plate 117 and the burner case 110 can be cooled. The outside air can naturally flow into the combustion chamber S5 in a relatively low pressure state, in which it can pass through the bottom plate 117.

[0202] The lower side of the bottom plate 117 can form an air inflow passage SP. The air inflow passage SP can be formed between the frame bottom surface portion 61 and the drawer cover 47 or between the frame bottom surface portion 61 and the bottom surface panel 17. The air inflow passage SP is a kind of empty space, and can also be considered as a part of the installation space IS. The air inflow passage SP can become a path through which the outside air is guided to the inside of the heating device 100.

[0203] Figure 19 The middle arrow ④ indicates the direction of airflow that cools the outside of the base plate 117 via the protrusions 117a. This external air can contact the base plate 117 through the air inflow channel SP. Thus, the air that has cooled the base plate 117 can continue to move along the air inflow channel SP and enter the combustion chamber S5 through the gap between the burner housing 110 and the rear panel 20, i.e., the second air inlet IP2. This structure will be described again below.

[0204] The bottom portion 61 of the frame may be provided with a combustion air hole 119. The combustion air hole 119 is formed by extending through the bottom portion 61 of the frame in the vertical direction. The combustion air hole 119 can be connected to the retainer air hole 127a' of the nozzle retainer 127, which will be described below. Air flowing in through the combustion air hole 119 is supplied to the nozzle through the retainer air hole 127a' and can be used for primary combustion of the fuel gas. Therefore, the combustion air hole 119 can constitute a first air intake.

[0205] Next, refer to Figure 15 The burner 120 constituting the heating device 100 will be described. For reference, Figure 15 The diagram shows the configuration of the burner 120 incorporating the flame guide 140, which will be described later. It can be seen that the burner 120 can be a straight tubular structure extending in one direction along the rear edge of the lower part of the frame 60. The burner body 121, which forms the skeleton of the burner 120, can be a bar extending in one direction. The burner body 121 can extend along the length of the burner shell 110. The gas flow path 121a, supplied with the mixed gas, can extend in a front-rear direction inside the burner body 121.

[0206] The burner 120 can be configured to be located away from the heating flow path GP. The heating flow path GP is the air movement path formed by the flow path guide 130 (described later), and can be considered as a channel connecting the combustion chamber S5 and the heating chamber S2. If the burner 120 is configured to be away from the heating flow path GP, it is ensured that the distance from the burner 120 to the heating flow path GP is sufficient to create space for the air that may be heated by the flame. Therefore, the burner 120 can generate a flame along the direction of the heating flow path GP.

[0207] Reference Figure 6 The burner 120 is connected to an ignition spark plug 122. The ignition spark plug 122 can ignite the mixed gas mixture. The ignition spark plug 122 may be equipped with a connector 122a for connection to a power source (see reference). Figure 13). The connector 122a can be combined with a power supply part inside the housing 10.

[0208] One side of the burner body 121 can be provided with a mixing pipe 123. The mixing pipe 123 can mix air supplied from the outside and gas supplied from a nozzle holder 127. If the burner 120 is operated, gas is supplied from the nozzle holder 127 to one end of the burner 120. At this time, due to the structure in which the width of the mixing pipe 123 is narrowed, low pressure is formed, and air from the periphery can be naturally supplied to the mixing pipe 123 side due to the pressure difference. Also, mixed gas is burned due to the ignition spark plug 122, and thus a flame can be generated in the flame hole 125.

[0209] Referring to Figure 21 , a lower portion of the mixing pipe 123 can be provided with a pipe air hole 124. The pipe air hole 124 can be open toward the bottom plate 117. The pipe air hole 124 is connected with a holder air hole 127a' of the nozzle holder 127 combined with the mixing pipe 123. Thus, external air can flow into the gas flow path 121a of the burner body 121 through the holder air hole 127a' and the pipe air hole 124. As a reference, a combustion air hole 119 can be provided in the bottom plate 117 at a position opposite to the pipe air hole 124. External air, more accurately, external air flowing into the installation space IS can flow in through the combustion air hole 119. The combustion air hole 119 can constitute a first intake portion IP1 to be described below.

[0210] More specifically, when gas is supplied to the inside of the burner body 121, a portion of air required for combustion (hereinafter referred to as "primary air") is flowed in together with the gas and mixed with the gas, and such mixed gas of the gas and the air can be burned in the flame hole 125. Also, new air (referred to as "secondary air") is flowed in again to the flame side around the flame in which combustion is completed, and thus complete combustion is completed. Thus, only a sufficient amount of secondary air supply can complete complete combustion in the process in which combustion is completed, and thus the thermal efficiency of the burner 120 can be improved. The supply structure of such secondary air will be described again below.

[0211] As Figure 15As shown, the flame holes 125 can be formed through the burner body 121. The flame holes 125 form passages for mixed gas inside the burner body 121 to be discharged outside the burner body 121. The side of the burner body 121 can have a plurality of flame holes 125 arranged at predetermined intervals along the length of the burner body 121. Thus, the burner body 121 can have a plurality of gas discharge passages arranged along the length of the burner body 121. Reference numeral 126 shows auxiliary flame holes arranged in front of the flame holes 125 for the transmission of flames.

[0212] In the present embodiment, the flame holes 125 are arranged only on the front of the burner body 121. Here, the front of the burner body 121 refers to the surface of the burner 120 facing the door 50. The flame holes 125 are not arranged on the top surface, the bottom surface, or the back surface of the burner 120, but only on the surface facing the front. The flame holes 125 can be considered to be opposite the flow path guide 130.

[0213] The flame holes 125 can be open toward the lower flow path. The lower flow path is a path for air to flow inside the combustion chamber S5, and at least a portion of the lower flow path can be formed by the flow path guide 130 in the present embodiment. If the flame holes 125 are open toward the lower flow path, the flames generated at the flame holes 125 do not heat the surface of the burner case 110, but can heat the air in the combustion chamber S5 intensively. Thus, the burner 120 can heat the air in the combustion chamber S5 efficiently, and can prevent the burner case 110 from being overheated by radiant heat. In other words, the direction in which the flame holes 125 of the burner 120 are open can be considered to be parallel to the direction of the rotation axis 92 of the circulating fan 93. Alternatively, the flame holes 125 of the burner 120 can be considered to be open toward the flow path in which the circulating chamber SA and the combustion chamber S5 are connected to each other.

[0214] The flame holes 125 can constitute a plurality of heat sources. The flame holes 125 can be arranged along the length of the burner body 121, and a plurality of flame holes 125 can be arranged along the circumferential direction of the burner body 121. In the present embodiment, the burner 120 has three flame hole matrices arranged at different angles from each other in the circumferential direction. The three flame hole matrices can provide stronger flames by combining the flames with each other.

[0215] One side of the burner body 121 can be provided with a nozzle holder 127. The nozzle holder 127 can deliver gas supplied from the outside to the burner body 121. To this end, the nozzle holder 127 can be connected with a nozzle (not shown) of a gas pipe (not shown) outside. The nozzle holder 127 delivers gas supplied from the gas pipe to the gas flow path 121a, in the process of which air and gas can be mixed with each other.

[0216] Referring to Figure 21 The holder body 127a of the nozzle holder 127 can be coupled by surrounding one end of the burner body 121. The lower portion of the holder body 127a can be formed with a holder air hole 127a'. The holder air hole 127a' can be connected with the pipe air hole 124 provided to the mixing pipe 123. The holder air hole 127a' and the pipe air hole 124 can be connected with each other to form one air suction passage. The air suction passage can become a path for supplying primary air.

[0217] Referring to Figure 21 A path through which primary air outside flows in is shown. The primary air can flow in the direction of the inside of the combustion chamber S5 (arrow ① direction) through the first air inlet portion, i.e., the combustion air hole 119 formed in the bottom plate 117. Also, the primary air flowing in can move along the gas flow path 121a of the burner body 121 (arrow ③ direction) after sequentially passing through the holder air hole 127a' and the pipe air hole 124. At this time, the primary air can flow in not only through the combustion air hole 119 but also through the panel opening portion 23 of the rear face panel 20 (arrow ② direction). Since the panel opening portion 23 is open toward the nozzle holder 127, the primary air can be smoothly supplied to the nozzle.

[0218] The combustion air hole 119 and the panel opening portion 23 can constitute a first air inlet portion IP1. The first air inlet portion IP1 can become a passage for directly supplying air to the gas flow path 121a of the burner body 121. Even if the panel opening portion 23 is shielded by the shielding cover 28, since the nozzle holder 127 is partially in an open state, it can become a part of the first air inlet portion. As another example, either one of the combustion air hole 119 and the panel opening portion 23 can be omitted, and the first air inlet portion IP1 can be constituted only by the remaining one.

[0219] The nozzle holder 127 can be provided with a gas inflow hole 127b. The gas inflow hole 127b can be connected to a gas pipe. In the present embodiment, the gas inflow hole 127b is open in a direction different from the holder air hole 127a'. More specifically, the gas inflow hole 127b can be directed toward the panel opening portion 23 of the back panel 20. Thus, the gas inflow hole 127b can be exposed to the outside through the panel opening portion 23. Figure 21 An arrow ④ indicates a path along which external gas is supplied in the direction of the gas inflow hole 127b.

[0220] As shown in FIG. 10, the burner fixing piece 128 attached to the burner body 121 can be in close contact with the fixing rib 113b. The burner body 121 can be fixed to the burner case 110 and the frame 60 by the burner fixing piece 128 and the bracket portion 129 on the opposite side, respectively. Figure 21

[0221] Next, a flow path guide 130 constituting the heating device 100 will be described. Referring to an exploded view of FIG. 11, the flow path guide 130 can have a substantially hexahedral shape. Since the flow path guide 130 is accommodated in the combustion chamber S5, it can have a volume smaller than or the same as that of the combustion chamber S5. The flow path guide 130 can be formed separately from the burner case 110 and then disposed in the combustion chamber S5. As another example, the flow path guide 130 can be integrally formed with the burner case 110. Figure 7

[0222] The flow path guide 130 can form a plurality of flow paths together with the burner case 110. The flow path guide 130 can divide the combustion chamber S5 into a plurality of spaces to generate air flows toward the divided spaces, respectively. Here, division means that air flows toward each space even if the two spaces are not completely partitioned. As will be described later, the flow path guide 130 can divide the connection passage 61a' into a heating air outlet portion 134 and cooling air outlet portions OP1 and OP2.

[0223] ​​The flow path guide 130 can divide the combustion chamber S5 to form a plurality of flow paths. A part of the flow paths GP can deliver high-temperature air heated by the burner 120 to the circulation chamber SA, and the other parts CP1, CP2 can pass relatively low-temperature air to cool components. At this time, the flow path through which high-temperature air passes can be a heating flow path GP, and the flow path through which low-temperature air passes can be a cooling flow path CP1, CP2. In other words, the heating flow path GP is a guide flow path that guides high-temperature air heated along the inside of the flow path guide 130, and the cooling flow paths CP1, CP2 disposed outside the flow path guide 130 can be referred to as cooling flow paths through which relatively low-temperature air flowing from the outside passes. Such flow paths will be described in detail below.

[0224] As such, the flow path guide 130 can form the heating flow path GP and the cooling flow paths CP1, CP2, which are divided from each other, inside the combustion chamber S5. The heating flow path GP can become a path through which air heated by the burner 120 flows. The cooling flow paths CP1, CP2 are paths through which air flowing around the periphery of the burner 120 can flow, and can become paths through which relatively low-temperature air flows compared to air passing through the heating flow path GP.

[0225] The cooling flow paths CP1, CP2 can further include a first cooling flow path CP1 and a second cooling flow path CP2. The first cooling flow path CP1 can have a path passing through the upper portion of the burner 120. The second cooling flow path CP2 can have a path passing through the lower portion of the burner 120 and connected in the direction of the heating device 100 along the surface of the heating device 100 toward the circulation device C. Such a structure will be observed again in detail below.

[0226] High-temperature air of the combustion chamber S5 heated by the burner 120 can be delivered to the circulation chamber SA. More accurately, the flow path guide 130 can be connected to the heating chamber S2 in the circulation chamber SA, and can deliver heated air to the heating chamber S2. The flow path guide 130 can form a lower flow path inside the combustion chamber S5. The lower flow path can be connected to an upper flow path formed by the heating chamber S2. The lower flow path can also be regarded as a heating flow path GP disposed inside the flow path guide 130.

[0227] The flow path guide 130 can be open upward and rearward, respectively. Here, the upward direction refers to the direction toward the heating chamber S2. The rearward direction refers to the direction toward the burner 120. The flow path guide 130 can guide the movement of air between the burner 120 and the heating chamber S2 through the heating flow path GP open upward and downward.

[0228] Referring toFigure 13 and Figure 14 The flow path guide 130 can be inserted through the top surface opening portion 116 of the combustor case 110. The combustor case 110 can form a movement path of air configured to move upward using the top surface opening portion 116. The flow path guide 130 can have a substantially hexahedral shape. The flow path guide 130 can be coupled to the combustor case 110.

[0229] Specifically, the flow path guide 130 can include a guide front portion 131, a guide side portion 132, a guide top portion 133, and a guide back portion 135. The guide front portion 131 can constitute a front surface of the flow path guide 130. The guide side portion 132 can constitute a side surface of the flow path guide 130. The guide top portion 133 can constitute a top surface of the flow path guide 130. The guide back portion 135 can constitute a back surface of the flow path guide 130.

[0230] The guide top portion 133 can have a heating air outlet portion 134. The heating air outlet portion 134 can be formed in the guide top portion 133 in the up-and-down direction. The heating air outlet portion 134 can connect a heating flow path GP formed in the inside of the flow path guide 130 to the heating cavity S2. A plurality of the heating air outlet portions 134 can be arranged in the left-and-right direction of the flow path guide 130. As another example, the heating air outlet portion 134 can also be in the form of one long hole continuously with each other.

[0231] The guide front portion 131 can be attached to the front plate 111 of the combustor case 110. More precisely, the guide front portion 131 can be attached to the interval portion 111a of the front plate 111. The guide front portion 131 can be coupled or welded to the interval portion 111a using a fastener such as a screw (not shown). In the present embodiment, the flow path guide 130 is coupled only to the interval portion 111a, and the remaining portions are not coupled to the combustor case 110.

[0232] Referring to Figure 18 to Figure 20The width of the upper end portion of the flow path guide 130 can be narrower than the width of the connection passage 61a. Thereby, the outer surface of the flow path guide 130 and the inner surface of the connection passage 61a can be spaced apart from each other. As such, the cooling air outlet portions OP1, OP2 can be formed between the spaced apart flow path guide 130 and the connection passage 61a. The cooling air outlet portions OP1, OP2 can be formed continuously around the upper end surface of the flow path guide 130. As another example, the cooling air outlet portions OP1, OP2 can be divided into the flow path CP1 outlet OP1 formed between the guide front portion 131 of the flow path guide 130 and the connection passage 61a, and the flow path CP2 outlet OP2 formed between the guide back portion 135 and the connection passage 61a, which can also be unconnected to each other.

[0233] The cooling flow paths CP1, CP2 can be formed around the periphery of the flow path guide 130. At least a portion of the cooling flow paths CP1, CP2 can be formed along the space around the flow path guide 130. As such, the first cooling flow path CP1 and the second cooling flow path CP2 can function as a heat insulating portion around the heating flow path GP. The cooling flow paths CP1, CP2 can be disposed outside of the flow path guide 130 and inside of the heating case 110.

[0234] As such, the flow paths formed by the flow path guide 130 can be divided. That is, (i) the heating flow path GP formed inside the flow path guide 130 to deliver heated air to the heating chamber S2 and (ii) the cooling flow paths CP1, CP2 formed around the heating flow path GP through which relatively low temperature air passes, are divided from each other. That is, the heating flow path GP and the cooling flow paths CP1, CP2 can form a double flow path.

[0235] The cooling flow paths CP1, CP2 can include a first cooling flow path CP1 and a second cooling flow path CP2. The first cooling flow path CP1 and the second cooling flow path CP2 can be disposed outside of the flow path guide 130, respectively. The first cooling flow path CP1 and the second cooling flow path CP2 are disposed opposite to each other with the heating flow path GP therebetween, thereby enabling different air moving paths from each other to be formed. The first cooling flow path CP1 and the second cooling flow path CP2 are the same in that (i) they connect the combustion chamber S5 and the heating chamber S2, and (ii) they form a path through which relatively low temperature air passes, which is divided from the heating flow path GP.

[0236] The first cooling flow path CP1 can surround the upper end portion of the flow path guide 130 together with the second cooling flow path CP2. Thus, the heating flow path GP disposed inside the flow path guide 130 can become a path through which air heated to a high temperature moves, but the second cooling flow path CP2 surrounding the heating flow path GP can form a cooling passage through which a relatively low temperature passes. Since the cooling passage surrounds the heating flow path GP, it can constitute an insulating layer.

[0237] Referring to Figure 18 It can be seen that the upper end portion of the flow path guide 130 protrudes into the inside of the heating chamber S2. In the present embodiment, a portion of the flow path guide 130 enters the inside of the heating chamber S2 through the connection passage 61a. The heating air outlet portion 134 of the heating flow path GP can also be located inside the heating chamber S2. Thus, the air heated by the heating flow path GP does not leak to the outside of the flow path guide 130, but can be accurately delivered to the inside of the heating chamber S2. As such, the portion of the flow path guide 130 protruding into the heating chamber S2 can be referred to as a protruding portion (not assigned a reference numeral).

[0238] If a portion of the flow path guide 130, i.e., the protruding portion, enters the inside of the heating chamber S2 through the connection passage 61a, the outlet of the heating flow path GP, i.e., the heating air outlet portion 134, and the outlets of the cooling flow paths CP1, CP2, i.e., the cooling air outlet portions OP1, OP2, have a height difference from each other. More accurately, the heating air outlet portion 134 can be formed higher than the cooling air outlet portions OP1, OP2. As such, the high-temperature air discharged from the heating air outlet portion 134 and the relatively low-temperature air discharged from the cooling air outlet portions OP1, OP2 can not be mixed in the connection passage 61a. Thus, the high-temperature air passing through the heating flow path GP can effectively heat the air inside the heating chamber S3, and the low-temperature air passing through the cooling flow paths CP1, CP2 can cool the peripheral components of the connection passage 61a. In particular, it is possible to prevent the lower portion of the frame 60 surrounding the connection passage 61a from being deformed by high heat or the enamel coating of the frame 60 from being damaged.

[0239] Referring to Figure 13If the guide front face portion 131 is in close contact with the partition portion 111a, an empty space extending in the up-and-down direction can be formed between the front plate 111, the partition portion 111a, and the surface of the guide front face portion 131. The empty space can form a first cooling flow path CP1. If the air outside the combustion chamber S5 that is not heated by the burner 120 or is less affected by the burner 120 passes through the first cooling flow path CP1 upward, the first cooling flow path CP1 can cool not only the surface of the front plate 111 and the guide front face portion 131 but also the frame bottom face portion 61. As a reference, a path formed along the bottom plate 117 that is the lower portion of the burner 120 can also be considered as a part of the first cooling flow path CP1.

[0240] Referring to FIG. 10 as a plan view, Figure 16 It can be seen that the first cooling flow path CP1 is formed in a state in which the two partition portions 111a are present. The first cooling flow path CP1 can form a continuous path between the partition portions 111a. The lower end of the first cooling flow path CP1 can be open toward the bottom plate 117 of the burner case 110.

[0241] Referring to FIG. 11 as a plan view, Figure 18 The upper end of the first cooling flow path CP1 can be open toward the combustion chamber S5 between the upper portion of the flow path guide 130 and the connection passage 61a that penetrates the frame bottom face portion 61. More accurately, in a state in which the upper end portion of the flow path guide 130 is disposed at the connection passage 61a, a first cooling outlet portion OP1 portion is formed between the outer surface of the flow path guide 130 and the inner surface of the connection passage 61a. In other words, it can be considered that the first cooling outlet portion OP1 portion is formed around the upper end portion of the flow path guide 130.

[0242] Referring to FIG. 12 as a plan view, Figure 19 The second cooling flow path CP2 formed by the flow path guide 130 is shown. The second cooling flow path CP2 can be disposed at the upper portion of the burner 120. The second cooling flow path CP2 can be formed between the flow path guide 130 and the frame bottom face portion 61. In this way, the second cooling flow path CP2 can be disposed along the upper portion of the combustion chamber S5.

[0243] The second cooling flow path CP2 can become a flow path through which a part of air outside the combustion chamber S5 moving along the upper surface of the burner 120 passes. The air passing through the second cooling flow path CP2 can cool the surface of the flow path guide 130 and the frame bottom face portion 61. Figure 19The arrow ⑨ in the drawing indicates the flow direction of the air moving along the second cooling flow path CP2. As will be described later, the outlet of the second cooling flow path CP2, i.e., the second cooling air outlet OP2, can be connected by the flow path inlet end 65a between the guide back surface portion 135 and the frame bottom surface portion 61.

[0244] In the present embodiment, the second cooling flow path CP2 is formed in parallel with the top surface of the combustion chamber S5, i.e., the top plate 113 or the frame bottom surface portion 65. Unlike this, the first cooling flow path CP1 is formed in parallel with the surface of the combustion chamber S5, i.e., the front plate 111. In this way, the first cooling flow path CP1 and the second cooling flow path CP2 can be formed in different directions and in different regions from each other. In the present embodiment, the start path of the first cooling flow path CP1 is located at a lower position than the flame hole 125, and the start path of the second cooling flow path CP2 is located at a higher position than the flame hole 125.

[0245] The outlets of the cooling flow paths CP1, CP2, i.e., the first cooling air outlet OP1 and the second cooling air outlet OP2, can be formed between the upper edge of the flow path guide 130 and the connection passage 61a provided to the frame bottom surface portion 61. The first cooling air outlet OP1 and the second cooling air outlet OP2 can be configured to surround the heating air outlet 134 of the heating flow path GP. In this way, the first cooling air outlet OP1 and the second cooling air outlet OP2 can function as a heat insulating portion around the heating air outlet 134 of the heating flow path GP. For reference, the first cooling air outlet OP1, the second cooling air outlet OP2, and the inlet of the heating air outlet 134 of the heating flow path GP can each become an air inlet with respect to the circulation device C.

[0246] The first cooling flow path CP1 and the second cooling flow path CP2 can each be partitioned from the heating flow path GP, but the first cooling flow path CP1 and the second cooling flow path CP2 can be connected to each other at the outlets, i.e., the cooling air outlets OP1, OP2. The first cooling air outlet OP1 can be formed between the guide front surface portion 131 and the connection passage 61a, and the second cooling air outlet OP2 can be formed between the guide back surface portion 135 and the connection passage 61a. The first cooling air outlet OP1 and the second cooling air outlet OP2 can be connected to each other between the guide side surface portion 132 constituting the cooling air outlets OP1, OP2 and the connection passage 61a. Thus, the first cooling air outlet OP1 and the second cooling air outlet OP2 can be connected to each other to form a substantially quadrangular shape.

[0247] The first cooling air outlet portion OP1 and the second cooling air outlet portion OP2 can be connected to each other to form a continuous path. Since the flow path guide 130 and the connection passage 61a are each a quadrangular shape, the continuous cooling air outlet portions OP1, OP2 formed by the first cooling air outlet portion OP1 and the second cooling air outlet portion OP2 can be a passage structure as a whole in a quadrangular shape. That is, the heating air outlet portion 134 in a quadrangular shape can be surrounded by the cooling air outlet portions OP1, OP2 in a larger quadrangular shape, with reference to a planar structure.

[0248] On the other hand, the guide back surface portion 135 can be formed to be shorter in the up-down direction than the guide front surface portion 131. Thus, the guide back surface portion 135 can be spaced apart from the bottom plate 117 toward the upper portion by a longer distance than the guide front surface portion 131. That is, the lower end of the guide back surface portion 135 is spaced apart from the bottom of the combustion chamber S5 toward the upper portion by a larger distance than the lower end of the guide front surface portion 131, and thus the inlet of the heating flow path GP can be open toward the burner 120. The flame F of the burner 120 can be directed to the inside of the heating flow path GP through the inlet of the heating flow path GP. Thus, it can be considered that the inlet of the heating flow path GP is formed between the lower end of the guide back surface portion 135 and the bottom plate 117.

[0249] A portion of the guide back surface portion 135 can be bent to form a back surface bent portion 135a. The back surface bent portion 135a can extend in the direction of the back surface panel 20, more accurately, in a direction parallel to the direction in which the flame hole 125 is open. Referring to Figure 19 , the back surface bent portion 135a can narrow the distance between a guide end portion 145a of a flame guide 140 to be described below and the flow path guide 130. A first spaced portion G1 spaced apart by a predetermined distance can be formed between the back surface bent portion 135a and the guide end portion 145a. In this way, secondary air can flow into the first spaced portion G1. That is, the first spaced portion G1 can be connected to the inlet of the heating flow path GP. If a portion of air introduced from the outside flows into the first spaced portion G1 between the back surface bent portion 135a and the guide end portion 145a, it can become secondary air supplied to the burner 120. Such secondary air is supplied to the flame F generated in the flame hole 125 of the burner 120 and contributes to complete combustion.

[0250] On the other hand, the flow path guide 130 can be provided with a guide fence 137. The guide fence 137 can be provided at the lower end of the guide front portion 131. The guide fence 137 can protrude in a direction inclined from the up-and-down direction toward the burner 120. The guide fence 137 can guide the air heated by the burner 120 toward the heating flow path GP. The guide fence 137 can cause the air heated by the flame F of the burner 120 to move along the heating flow path GP toward the heating chamber S2, rather than toward the first cooling flow path CP1.

[0251] Referring to Figure 18 The lower end of the guide fence 137 can be provided at a position lower than the flame holes 125. Reference numeral H1 indicates an imaginary horizontal line passing through the lowermost flame hole 125 among the flame holes 125 of the burner 120. It can be seen that the flame holes 125 of the burner 120 are located at a position higher than the lower end of the guide fence 137. Thus, if the air is heated by the flame F generated at the flame holes 125, the heated air can be guided to the upper side than the lower end of the guide fence 137. In addition, in the case where the flame F is formed long in the front-and-rear direction, the guide fence 137 can also cause the flame F to be directed away from the first cooling flow path CP1.

[0252] Next, the flame guide 140 will be described. The flame guide 140 can guide the direction in which the flame generated by the burner 120 is formed. The flame guide 140 can guide the flow of air so that the air heated by the burner 120 moves toward the heating flow path GP. The flame guide 140 can be provided between the burner 120 and the flow path guide 130. Thus, the flame F of the burner 120 and the heated air can be guided along the flame guide 140 toward the flow path guide 130.

[0253] In the present embodiment, the flame guide 140 can be provided between the upper portion of the flame holes 125 and the heating flow path GP of the flow path guide 130. The flame F generated at the flame holes 125 can be blocked by the flame guide 140 from extending further upward, and instead move along the flame guide 140 toward the heating flow path GP. Thus, the burner 120 can heat the air rising through the heating flow path GP intensively.

[0254] The flame guide 140 can be formed of a material having high heat resistance. The flame guide 140 can be formed of a plate-shaped material. The flame guide 140 can be formed long in the length direction of the burner 120. The flame guide 140 can have a length capable of covering the entire region in which the flame holes 125 are arranged.

[0255] In the present embodiment, the flame guide 140 can include a fixed body 141 and a guide vane 145. The fixed body 141 and the guide vane 145 can be one plate-shaped structure connected to each other. The fixed body 141 can be coupled to the burner 120. The fixed body 141 can be coupled to a surface of the burner 120. To this end, the fixed body 141 can be in a curved surface form corresponding to the surface of the burner 120. Referring to Figure 13 , the fixed body 141 can be coupled to a guide fastening portion 121b disposed on the surface of the burner 120. Thus, in the flame guide 140, the fixed body 141, which is a part thereof, can be coupled to the burner 120, and the guide vane 145 can extend from the fixed body 141 in the direction of the flow path guide 130. More precisely, a guide end portion 145a disposed at an end of the guide vane 145 can extend in a direction inclined upward toward the connection passage 61a.

[0256] Referring to Figure 19 , the flame F can extend at a lower portion of the guide vane 145 with reference to the guide vane 145. A lower portion of the flame guide 140 and a bottom surface of the burner case 110 can form a part of the heating flow path GP in which the heated air is guided. A lower portion of the guide vane 145 and the bottom plate 117 can be spaced apart from each other to form an empty space, and the empty space can form a part of the heating flow path GP. The lower portion of the guide vane 145 can also be regarded as forming a flame space of the flame F.

[0257] An upper portion of the guide vane 145 can have the air introduced from the outside moved therethrough. An upper portion of the guide vane 145 and the top plate 113 can form an outer air space S6 in which the secondary air introduced from the outside can flow. The outer air space S6 can constitute the second cooling flow path CP2. The air passing through the outer air space S6 can be transferred to a lower portion of the frame 60 while cooling the surrounding portion and passing through the cooling air outlet portion OP2.

[0258] A part of the secondary air passing through the outer air space S6 can also enter the heating flow path GP through a first spaced portion G1 between the guide end portion 145a and the back bent portion 135a, thereby contributing to complete combustion of the burner 120. Such a part of the secondary air entering the outer air space S6 can move toward the first spaced portion G1 between the guide end portion 145a and the back bent portion 135a, thereby converging into the heating flow path GP.

[0259] More specifically, the outer air space S6 can be formed between the flame guide 140 and the frame back surface portion 65 covering the top surface opening portion 116 of the burner case 110. With the back surface bent portion 135a as a reference, the outside air (i) flowing into the outer air space S6 can enter the outlet of the second cooling flow path CP2, i.e., the second cooling air outlet portion OP2 (arrow 9 direction) through the second partition portion G2 formed in the upper portion of the back surface bent portion 135a, or (ii) can be merged into the inlet of the heating flow path GP through the first partition portion Gl formed between the back surface bent portion 135a and the guide end portion 145a. The air merged into the heating flow path GP can be delivered to the flame formed in the burner 120 as secondary air to assist complete combustion.

[0260] The outer air space S6 can constitute a part of the second cooling flow path CP2. The air passing through the second cooling flow path CP2 can be delivered to the lower portion of the frame 60 through the second cooling air outlet portion OP2, thereby exerting a cooling function.

[0261] Observing the structure of the back surface bent portion 135a and the guide end portion 145a, since the end portion of the back surface bent portion 135a protrudes toward the back surface panel 20 more than the guide end portion 145a, it is possible to guide the secondary air toward the inlet of the heating flow path GP. At this time, the back surface bent portion 135a can be disposed between the guide end portion 145a and the flow path inlet end 65a. With the back surface bent portion 135a as a reference, the merging portion (first partition portion Gl) of the heating flow path GP formed between the back surface bent portion 135a and the guide end portion 145a and the connection portion G2 of the second cooling air outlet OP2 formed between the back surface bent portion 135a and the flow path inlet end 65a can be demarcated. The connection portion G2 between the back surface bent portion 135a and the flow path inlet end 65a, i.e., the second partition portion G2, can be connected to the second cooling air outlet portion OP2. In the present embodiment, the second partition portion G2 has a higher position than the burner 120.

[0262] As another example, the flame guide 140 and the burner case 110 can also be spaced apart from each other to form the confluence portion (first spaced portion G1). If the flow path guide 130 is omitted, the guide end portion 145a of the flame guide 140 is extended to a position adjacent to the connection passage 61a, the confluence portion (first spaced portion G1) can be formed between the guide end portion 145a and the connection passage 61a. Further, as another example, the flow path guide 130 can also be integrally provided to the burner case 110, and the confluence portion (first spaced portion G1) can be formed between the guide end portion 145a and one end portion of the flow path guide 130.

[0263] Due to the upwardly inclined structure of the guide vanes 145, the outside air space S6 can become an empty space that gradually narrows in width toward the guide end portion 145a. Thus, the air can become faster in speed as it approaches the guide end portion 145a. The air that has become faster in speed can be smoothly delivered to the second cooling flow path CP2 or the first spaced portion G1.

[0264] The outside air space S6 can become a kind of heat insulating space S4 formed between the burner 120 and the lower portion of the frame 60. The outside air space S6 can reduce the amount of radiant heat of the burner 120 transferred to the lower portion of the frame 60, more accurately, to the portion where the frame bottom portion 61 and the frame back portion 65 are connected. Thus, the durability of the frame 60 can be improved.

[0265] Air outside the outside air space S6 can cool the flame guide 140 as it passes through the flame guide 140. The outside air space S6 is in surface contact with the flame guide 140 and exchanges heat, thereby reducing the temperature of the flame guide 140, and can prevent overheating of the flame guide 140. Figure 19 The middle arrow ⑧ indicates the flow direction of air moving along the surface of the burner 120. The air thus moving can cool the flame guide 140 as it passes through the flame guide 140. Also, the air that continues to move along the path of the second cooling flow path CP2 that is the outside air space S6 can be confluenced at the outlet OP2 of the second cooling flow path CP2, or can be confluenced at the heating flow path GP through the first spaced portion G1.

[0266] At this time, the air confluenced at the heating flow path GP through the first spaced portion G1 can become once-heated by heat exchange in the process of cooling the flame guide 140 as it passes through the flame guide 140. Thus, heat loss of secondary air supplied from the outside can be minimized.

[0267] On the other hand, the tip of the guide vane 145, i.e., the guide tip portion 145a, can extend only to a range that does not intrude into the heating flow path GP. Referring to Figure 18 It can be seen that the guide tip portion 145a extends only from the guide back portion 135 to a position that recedes in the direction toward the burner 120. With respect to an imaginary line extending in the up-and-down direction in which the guide back portion 135 is disposed, the guide tip portion 145a is disposed in a region that does not exceed the imaginary line. In this way, the guide tip portion 145a can not intrude into the heating flow path GP and can not hinder the flow of air through the heating flow path GP.

[0268] Next, referring to Figure 19 a process in which external air heated by the heating device 100 is supplied to the circulation device C will be described. First, if the ignition spark plug 122 is ignited after mixed gas in which air and gas are mixed is supplied to the burner 120, a flame can be generated at the flame hole 125 of the burner 120. Arrow ① indicates the direction of movement of the mixed gas, and arrow ② indicates the direction in which the flame is generated at the flame hole 125.

[0269] At this time, in order to burn the mixed gas at the burner 120, external air that flows in can be divided into primary air and secondary air. The primary air can flow into the inside of the combustion chamber S5 through the first air inlet portion 23, 119 (refer to Figure 21 ). Meanwhile, if gas supplied from the outside is injected using a nozzle, the gas injected using the nozzle and the primary air flow into the inside of the mixing pipe 123 together. In this way, the gas and the air that flow into the inside of the mixing pipe 123, respectively, are mixed to generate mixed gas in the process of flowing from the inside of the mixing pipe 123 to the side of the burner body 121.

[0270] On the other hand, secondary air is required for complete combustion of the mixed gas, and the secondary air can be supplied through a different path from the primary air. Referring to Figure 11 an enlarged view, a second air inlet portion IP2 can be disposed between the heating device 100 and the back panel 20. The second air inlet portion IP2 can become a predetermined space formed by the heating device 100 and the back panel 20 being spaced apart.

[0271] Referring to Figure 19 and Figure 20Further specifically, the second air inlet portion IP2 can be formed at a portion where the surface of the back panel 20 and the surface of the combustor case 110 are spaced apart from each other. The second air inlet portion IP2 can be provided between the end portion of the floor 117 constituting the combustor case 110 and the back panel 20. Thus, the second air inlet portion IP2 can be provided closer to the housing 10, i.e., closer to the back panel 20 than the connection passage 61a.

[0272] The second air inlet portion IP2 can be provided along the surface of the housing 10. Air from the outside moves along the surface of the housing 10, and thus can be naturally guided to the second air inlet portion IP2. In the present embodiment, the second air inlet portion IP2 is provided along the surface of the back panel 20 in the housing 10. In particular, the second air inlet portion IP2 can be provided in a direction parallel to the surface of the back panel 20.

[0273] Referring to Figure 20 the end portion of the floor 117 toward the surface of the back panel 20 is spaced apart from the back panel 20, and a second air inlet portion IP2 is formed therebetween. In the present embodiment, the back panel 20 is provided with the panel opening portion 23, and the shield cover 28 can cover the panel opening portion 23. Thus, the second air inlet portion IP2 can also be formed between the floor 117 and the shield cover 28.

[0274] The second air inlet portion IP2 can also be provided between the end portion of the top plate 113 and the back panel 20. The end portion of the top plate 113 is also spaced apart from the surface of the back panel 20, and a gap is formed therebetween, which can become the second air inlet portion IP2. Thus, air from the outside that becomes secondary air can flow in through the two second air inlet portions IP2 at different heights at the same time.

[0275] If the heat insulating space S4 is filled with a heat insulating material, the upper portion of the top plate 113 can also be narrowed by the passage through which air can flow. Thus, the lower portion of the heat insulating space S4 can also be omitted from the heat insulating material and become a predetermined space for the second air inlet portion IP2.

[0276] In the present embodiment, the second air inlet portion IP2 can be formed in a direction in which the combustor 120 is installed, i.e., a direction parallel to the length direction of the combustor 120. Since air from the outside that flows in through the second air inlet portion IP2 is used as secondary air for combustion of the combustor 120, it is necessary to uniformly supply the air to the entire flame hole 125 of the combustor 120. To this end, the second air inlet portion IP2 can extend in the length direction of the combustor 120. The second air inlet portion IP2 can extend in the same left-right direction as the combustor 120.Figure 1 The second air inlet portion IP2 can be disposed in the rear of the burner case 110.

[0277] On the other hand, the second air inlet portion IP2 can be connected to a cavity opening portion 118 formed in the burner case 110. Since the cavity opening portion 118 is a portion opened in the rear of the burner case 110, the second air inlet portion IP2 is connected to the cavity opening portion 118. Thus, the air from the outside flowing into the second air inlet portion IP2 can move toward the burner 120 through the cavity opening portion 118. Of course, as shown in FIG. 6, since the cavity opening portion 118 is blocked by the back panel 20 or the cover 28, the air flowing in can not leak to the rear and can be directed toward the burner 120. Figure 22

[0278] Referring to FIG. 5, the second air inlet portion IP2 is shown in an enlarged form. As can be seen, the second air inlet portion IP2 can be formed in the gap between the bottom plate 117 and the cover 28. As can be seen, the second air inlet portion IP2 can be disposed in the rear of the burner case 110 closer to the back panel 20 than the front plate 111 of the burner case 110. In this way, the air from the outside can enter the second air inlet portion IP2 after being cooled by the air inflow passage SP in advance. Figure 23

[0279] More specifically, the outside air flowing in the installation space IS can flow into the heating device 100 through the second air inlet portion IP2 at the end position of the air inflow passage SP blocked by the housing 10. In the present embodiment, the end position is formed in the portion of the housing 10 blocked by the back panel 20. Thus, since the outside air first passes the surface of the heating device 100 along the air inflow passage SP and then flows into the second air inlet portion IP2, the cooling function by the outside air can be effectively performed.

[0280] The second air inlet portion IP2 can extend longer than the length of the burner 120 or the same length as the burner 120. In this way, the second air inlet portion IP2 can uniformly supply the secondary air to a wider area of the burner 120.

[0281] The second air inlet portion IP2 can be disposed closer to the housing 10 than the connection passage 61a. In this way, the air flowing into the second air inlet portion IP2 can enter the second cooling outlet portion OP2 after sufficiently passing through the second heating flow path CP2 as the combustion space S5. In the present embodiment, the second air inlet portion IP2 is disposed closer to the back panel 20 than the connection passage 61a.

[0282] ​​Thus, if secondary air flows in through the second air inlet portion IP2, the burner 120 is able to completely burn the mixed gas. In the present embodiment, since the heating device 100 is arranged in a space separate from the circulation fan 93, it is not possible to directly take in secondary air using the circulation fan 93, but it is possible to take in secondary air by the secondary air supply structure as described above. That is, the heating device 100 is able to take in external air as secondary air without additional components such as a motor and a fan. As another example, the heating device 100 can be provided with an additional flow path and a fan for secondary air to flow in.

[0283] In particular, in the present embodiment, if the air heated in the combustion chamber S5 moves to the heating chamber S2 by natural draft or operation of the circulation fan 93, the pressure in the combustion chamber S5 decreases. If the pressure in the combustion chamber S5 is lower than the pressure outside, that is, in the installation space IS, external air present in the installation space IS is able to naturally flow into the combustion chamber S5 through the second air inlet portion IP2. Thus, if external air flows into the combustion chamber S5 due to the negative pressure in the combustion chamber S5, a portion thereof is used as secondary air, and the remaining portion is able to be used for cooling of components such as the lower portion of the frame 60.

[0284] Referring again to Figure 19 It can be seen that air thus supplied from the outside is used as secondary air. Air that has cooled the bottom plate 117 and the concave-convex portion 117a by flowing through the air inflow passage SP (arrow ④ direction) is able to flow into the combustion chamber S5 through the second air inlet portion IP2 (arrow ⑤ direction).

[0285] Thus, a portion of the external air that has flowed into the combustion chamber S5 is supplied to the flame hole 125 of the burner 120 after moving along the bottom plate 117 and passing through the lower side of the burner 120 (arrow ⑥ direction), and is used as secondary air. The secondary air is able to assist in complete combustion of the mixed gas in the flame hole 125.

[0286] Figure 19 Arrow ③ indicates the flow of heated air. The secondary air as described above completes combustion in the flame hole 125 to generate a flame, and if the air in the combustion chamber S5 is heated by the flame, it moves through the heating flow path GP. The heated air is able to be transferred to the heating chamber S2 through the heating flow path GP.

[0287] Referring to Figure 11, the high-temperature air (arrow ② direction) delivered to the heating chamber S2 can be mixed with the air (arrow ① direction) drawn into the cooking chamber S1 of the heating chamber S2 by the circulating fan 93. In this way, the mixed air can move toward the discharge chamber S3 and then be supplied again to the cooking chamber S1 (arrow ③ direction) through the discharge holes 75, 85. Figure 11 Arrow ④ indicates the direction in which external air moves toward the lower part of the heating device 100, and arrows ⑤ and ⑥ respectively indicate the air flows in the first cooling flow path CP1 and the second cooling flow path CP2.

[0288] In this way, in the present embodiment, the heating device 100 is arranged at the lower part of the circulating device C that circulates the air of the cooking chamber S1 and is arranged in a space independent of the circulating device C. With this structure, even if the circulating fan 93 is driven, the flame of the burner 120 can be unaffected by the fan. Thus, no additional flame stabilizing device (stabilizer) is needed, and a heat shield for protecting the inner wall of the cooking chamber S1 from the flame is also omitted.

[0289] In particular, in the present embodiment, the air heated by the heating device 100 expands in volume and decreases in density during the heating process, and the buoyancy increases, so that the air can rise by natural draft. More specific structures related to the circulation of air will be described again below. Thus, even in the state in which the circulating fan 93 is not working, the heated air can be supplied to the cooking chamber S1.

[0290] On the other hand, a part of the air moving along the first cooling flow path CP1 of the bottom plate 117 can move toward the front plate 111 and flow between the front plate 111 and the guide front face part 131. Then, the air can enter the first cooling flow path CP1 formed between the front plate 111 and the guide front face part 131 through the interval part 111a (arrow ⑦ direction).

[0291] In addition, external air can also flow in through the second air inlet part IP2 arranged at the upper part of the second air inlet part IP2 (arrow ⑤' direction). The external air thus flowing in can move along the second cooling flow path CP2 along the top surface of the burner 120. At this time, since a part of the air flowing in through the lower first air inlet part IP1 can also move along the top surface of the burner 120 (arrow ⑧ direction), the air can be mixed with the air flowing in through the upper second air inlet part IP2.

[0292] The air mixed as such can also move along the top surface of the flame guide 140 to cool the flame guide 140. The air that continues to move along the second cooling flow path CP2 of the flame guide 140 can enter the second cooling outlet portion OP2 (arrow ⑨ direction). The air that passes between the guide end portion 145a of the flame guide 140 and the flow path inlet end 65a toward the second cooling outlet portion OP2 can rise while cooling the frame bottom surface portion 61 and the lower portion of the circulation device C.

[0293] Figure 24 And Figure 25 The rear lower portion structure of the oven portion constituting the second embodiment of the present application is shown in FIG. 28. If the portions different from the previously explained embodiment are explained, the cover hole 29 can be formed in the cover 28 that covers the panel opening portion 23 of the back panel 20. The cover hole 29 can be in a form that penetrates the cover 28. The outside air can flow into the interior of the heating device 100, i.e., the combustion chamber S5, through the cover hole 29.

[0294] Referring to Figure 25 , the cover hole 29 is provided in front of the combustion chamber S5. Since the cover hole 29 is connected to the chamber opening portion 118, the cover hole 29 can make the outside air pass to the combustion chamber S5. In this way, a portion of the air that flows into the combustion chamber S5 through the cover hole 29 can be supplied to the burner 120 to become secondary air. In addition, a portion of the flowing air can be transferred to the second cooling flow path CP2 to cool the components. Thus, it can also be considered that the cover hole 29 constitutes a portion of the second inlet portion IP2. Of course, a portion of the air that flows in through the cover hole 29 can also be used as primary air.

[0295] The cover hole 29 can have a long hole shape that is arranged in a direction parallel to the direction in which the burner 120 extends, i.e., the length direction of the cover 28. A plurality of cover holes 29 can also be arranged at fixed intervals in the cover 28. In this way, the outside air that flows into the cover hole 29 formed in the direction in which the burner 120 extends can be uniformly supplied to the flame hole 125 of the burner 120.

[0296] Figure 26A sectional view shows a structure of a heating device 100 constituting a third embodiment of the present application. A part different from the above-described embodiments is explained. In the heating device 100, a flow path guide is not separately manufactured, and the flow path guide can be integrally formed in the burner case 110. That is, in the burner case 110 of the heating device 100, a flow path guide portion (not assigned a reference numeral) that forms the heating flow path GP is integrally formed. Thereby, the combustion chamber S5 can be divided by the flow path guide portion integrally arranged without separately forming the flow path guide.

[0297] Figure 27 to Figure 30 A sectional view shows a structure of a heating device 100 constituting a fourth embodiment of the present application. A part different from the above-described embodiments is explained. In the heating device 100, a guide vane 145 for guiding a flame of the burner 120 can be arranged. The guide vane 145 can be integrally formed in the flow path guide 130. The flow path guide 130 can not only guide the heated air toward the heating chamber S2, but also guide an extending direction of the flame.

[0298] Referring to Figure 28 The guide vane 145 can extend from a guide back portion 135 of the flow path guide 130. The guide vane 145 can be arranged in a direction inclined downward from a lower end of the guide back portion 135 toward the burner 120. The guide vane 145 can have a substantially plate-like structure. The guide vane 145 can extend in the same direction as the guide back portion 135. The guide vane 145 can have a length longer than or at least the same as a length of a region of the burner 120 in which the flame hole 125 is arranged.

[0299] An end portion 145a of the guide vane 145 can extend to a position adjacent to a surface of the burner 120. The end portion 145a of the guide vane 145 can be spaced apart from the surface of the burner 120 by a predetermined distance. In this way, air can flow toward the end portion 145a of the guide vane 145 from a gap spaced apart from the surface of the burner 120. External air can be transferred between the end portion 145a of the guide vane 145 and the surface of the burner 120 after flowing into the combustion chamber S5. The air thus transferred can be supplied to the flame hole 125 of the burner 120 as secondary air.

[0300] Referring to Figure 29The guide vane 145, the guide front portion 131, and the guide side portion 132 can form a heating flow path GP therebetween. Air heated by the burner 120 can rise through the heating flow path GP. The guide vane 145 can also function to guide the heated air to the heating flow path GP side. The guide vane 145 and the guide front portion 131 form a heating flow path GP that is narrower the closer it is to the upper portion, thereby enabling the flow rate of the rising air to be increased.

[0301] Referring to Figure 30 The flow of air into the heating flow path GP is indicated by arrow ①. Air that has passed through the heating flow path GP can enter the combustion chamber S5 (refer to arrow ①' direction). At the same time, air for cooling can also flow along the surface of the flow path guide 130 (arrow ② direction). After passing along the surface of the guide front portion 131 to cool the flow path guide 130, the air can move to the first cooling flow path CP1. In addition, a portion of the outside air can pass through the upper side of the guide vane 145 to cool the guide vane 145 (arrow ③ direction). The air that has cooled the guide vane 145 can also move to the second cooling flow path CP2.

[0302] Figure 31 to Figure 33 A structure of a heating device 100 constituting a fifth embodiment of the present application is shown in FIG. 5. The description will be made of the different parts from the previously described embodiments. A guide vane 145 can be disposed between the burner 120 and the flow path guide 130 constituting the heating device 100. The guide vane 145 can be integrally formed with the flow path guide 130. The flow path guide 130 can not only guide the heated air to the heating chamber S2, but also guide the extension direction of the flame.

[0303] Referring to Figure 31 The guide vane 145 can extend from the guide back portion 135 of the flow path guide 130. The guide vane 145 can be disposed in a direction inclined downward from the lower end of the guide back portion 135 toward the burner 120. The guide vane 145 can have a substantially plate-like structure. The guide vane 145 can extend in the same direction as the guide back portion 135. The guide vane 145 can have a length longer than or at least the same as the length of the region of the burner 120 in which the flame hole 125 is disposed.

[0304] Referring to Figure 32One end of the guide vane 145 can be connected to the guide back portion 135, and the other end of the guide vane 145 can be provided with a burner fixing portion 147 that abuts against the surface of the burner 120. The burner fixing portion 147 that abuts against the surface of the burner 120 can be fastened to a guide fastening portion 121b of the burner 120.

[0305] The guide vane 145 can be formed with a recessed portion 143 at a portion extending toward the burner fixing portion 147. The burner fixing portion 147 can surround the surface of the burner 120 from the recessed portion 143.

[0306] The guide vane 145 can connect between the guide back portion 135 and the burner 120, and divide an upper portion and a lower portion with the guide vane 145 as a reference. Referring to Figure 31 The upper portion of the guide vane 145 can be formed with a space connected to the second cooling flow path CP2. The lower portion of the guide vane 145 can become a space connected to the heating flow path GP.

[0307] Referring to Figure 32 The guide vane 145, the guide front portion 131, and the guide side portion 132 can form a heating flow path GP therebetween. Air heated by the burner 120 can rise through the heating flow path GP. The guide vane 145 can also function to guide the heated air toward the heating flow path GP side. The guide vane 145 and the guide front portion 131 can form the heating flow path GP that narrows in width as it approaches the upper portion, thereby accelerating the flow rate of the rising air.

[0308] Referring to Figure 33 The flow of air into the heating flow path GP is indicated by an arrow ①. Air that has passed through the heating flow path GP can enter the combustion chamber S5 (refer to the direction of an arrow ①'). At the same time, air for cooling can also flow along the surface of the flow path guide 130 (arrow ② direction). The air can move toward the first cooling flow path CP1 after passing along the surface of the guide front portion 131 to cool the flow path guide 130. In addition, a portion of the outside air can pass through the upper side of the guide vane 145 to cool the guide vane 145 (arrow ③ direction). The air that has cooled the guide vane 145 can also move toward the second cooling flow path CP2.

[0309] Figure 34 and Figure 35A structure of a heating device 100 constituting a sixth embodiment of the present application is shown. A part different from the above-described embodiments is explained, and the heating device 100 can be provided with a flame guide 140. The flame guide 140 can be combined to a surface of the burner 120. The flame guide 140 can guide a direction of a flame generated in a flame hole 125 of the burner 120.

[0310] The flame guide 140 can be provided with a fixed body 141 combined to the burner 120. The fixed body 141 can be in a curved surface shape corresponding to a surface of the burner 120. The fixed body 141 can be provided with a fastening hole 141a in which a guide fastening part 121b of the burner 120 is inserted.

[0311] The fixed body 141 can be connected with a guide vane 145. The guide vane 145 can guide a flame direction of the burner 120, and can guide air heated by the flame to a heating flow path GP direction. The guide vane 145 can have a substantially disc structure. The guide vane 145 can extend from the fixed body 141 with a recessed part 143 as a starting position.

[0312] The guide vane 145 can be provided with an air guide hole 148. The air guide hole 148 can be formed through the guide vane 145. The air guide hole 148 can form a path through which air passes. A part of air moving along an upper portion of the guide vane 145 can move to a lower side, that is, a flame hole 125 direction of the burner 120 through the air guide hole 148. Such air acts as secondary air, helps combustion of the burner 120, and can prevent a flame from being too long.

[0313] The air guide hole 148 can be constituted by a plurality of holes. In the present embodiment, the air guide hole 148 can be constituted by three rows in a length direction of the guide vane 145. The air guide holes 148 constituting the three rows can be provided at the same interval. Air can more smoothly flow to a front of the burner 120 through the plurality of vane holes.

[0314] Referring to Figure 35A portion of the air moving along the upper portion of the guide vane 145 can move downward (arrow ① direction) through the air guide hole 148. The air moving downward can be supplied to the front of the burner 120. The air thus supplied can become secondary air that forms a flame. F in the figure indicates the shape of the flame. The air thus passing through the air guide hole 148 can help complete combustion of the mixed gas to guide smooth generation of the flame. Meanwhile, the air flowing through the lower portion of the burner 120 (arrow ② direction) can also become secondary air to help complete combustion of the mixed gas.

[0315] Figure 36 and Figure 37 A structure of a heating device 100 constituting a seventh embodiment of the present application is shown. A portion different from the previously explained embodiments is explained, and the heating device 100 can be provided with a flame guide 140. The flame guide 140 can be coupled to the surface of the burner 120. The flame guide 140 can guide the direction of the flame generated in the flame hole 125 of the burner 120.

[0316] The flame guide 140 can be provided with a fixed body 141 coupled to the burner 120. The fixed body 141 can become a curved surface shape corresponding to the surface of the burner 120. The fixed body 141 can be provided with a fastening hole 141a in which the guide fastening portion 121b of the burner 120 is inserted.

[0317] The fixed body 141 can be connected with a guide vane 145. The guide vane 145 can guide the flame direction of the burner 120, and can guide the air heated by the flame in the direction of the heating flow path GP. The guide vane 145 can have a substantially disc structure. The guide vane 145 can extend from the fixed body 141 with the recessed portion 143 as a starting position.

[0318] The guide vane 145 can be provided with an air guide 146. The air guide 146 can have a shape in which a portion of the guide vane 145 is cut and raised. More accurately, the air guide 146 can extend from the guide vane 145 in a cantilever form.

[0319] At this time, the end portion of the air guide 146, which becomes the free end of the cantilever, can be spaced apart from the guide vane 145 at the greatest distance. That is, the air guide 146 can extend in a direction farther away from the air guide hole 148 as it gets closer to the end portion that is the free end. Thus, the air colliding with the air guide 146 can naturally move to the lower side of the air guide 146.

[0320] The lower side of the air guide 146 can be provided with an air guide hole 148. The air guide hole 148 can also be regarded as a hole left after the air guide 146 is bent from the guide vane 145. The air guide hole 148 can form a path for air to pass through. A portion of the air moving along the upper portion of the guide vane 145 can be blocked by the air guide 146 and directed to the air guide hole 148.

[0321] In this way, the air passing through the air guide hole 148 can move in the downward direction, i.e., the direction of the flame hole 125 of the burner 120. This air acts as secondary air, helps the combustion of the burner 120, and can prevent the flame from becoming too long.

[0322] The air guide 146 and the air guide hole 148 can be multiple. In the present embodiment, the air guide 146 and the air guide hole 148 can be provided three along the length direction of the guide vane 145, respectively. The multiple air guides 146 and air guide holes 148 can be provided at the same pitch. Air can flow more smoothly into the front of the burner 120 through the multiple air guide holes 148.

[0323] Referring to Figure 37 A portion of the air moving along the upper portion of the guide vane 145 can be blocked by the air guide 146 and move in the downward direction (arrow ① direction) through the air guide hole 148. The air moving in the downward direction can be supplied to the front of the burner 120. The air thus supplied can become secondary air for forming a flame. In the figure, F represents the shape of the flame. In this way, the air passing through the air guide hole 148 helps the complete combustion of the mixed gas and can guide the smooth generation of the flame. At the same time, the air flowing through the lower portion of the burner 120 (arrow ② direction) can also become secondary air and help the complete combustion of the mixed gas.

[0324] The above description is only an illustrative description of the technical idea of the present application, and persons with ordinary knowledge in the technical field to which the present application belongs can make various modifications and changes within the scope of the essential characteristics of the present application. Therefore, the embodiments disclosed in the present application are not intended to limit the technical idea of the present application, but are intended to illustrate the present application, and the scope of the technical idea of the present application is not limited to such embodiments. The scope of protection of the present application should be interpreted by the claims, and should be interpreted as including all technical ideas within the scope equivalent thereto.

Claims

1. A cooking device, characterized in that, include: shell; A frame, disposed inside the outer shell, forms a cooking chamber; A circulation device having a circulation chamber communicating with the cooking chamber; as well as A heating device having a combustion chamber connected to the circulation chamber and equipped with a burner that heats the air flowing into the combustion chamber; The heating device is provided with a first air inlet that opens toward the surface of the burner; A second air intake, connected to the combustion chamber, is disposed between the heating device and the outer casing.

2. The cooking apparatus according to claim 1, characterized in that, The second air intake is configured with the heating device and the surface of the housing facing the heating device spaced apart from each other.

3. The cooking apparatus according to claim 1, characterized in that, The heating device is arranged along the rear edge of the lower part of the frame in one direction, and the second air intake is arranged between the heating device and the outer casing in the same direction.

4. The cooking apparatus according to claim 1, characterized in that, The second air intake is arranged in a direction parallel to the surface of the housing.

5. The cooking apparatus according to claim 1, characterized in that, The connecting channel between the circulation chamber and the combustion chamber is open in the frame, and the second air intake is configured to be closer to the housing than the connecting channel.

6. The cooking apparatus according to claim 1, characterized in that, The lower part of the heating device has an air inlet channel for air flow, and the second air inlet is located at the end of the air inlet channel.

7. The cooking apparatus according to claim 1, characterized in that, The back panel constituting the outer shell is disposed on the opposite side of the entrance to the cooking chamber, and the second air intake is disposed between the heating device and the back panel.

8. The cooking apparatus according to claim 1, characterized in that, A space is provided between the outer shell and the frame, and the heating device is disposed in the space. The housing is provided with a panel opening that opens the installation space, and the second air intake is connected to the panel opening.

9. The cooking apparatus according to claim 8, characterized in that, The housing is provided with a panel opening that opens the installation space to the outside of the housing. The panel opening is covered by a cover, and the cover hole connected to the second air intake is open in the cover.

10. The cooking apparatus according to claim 1, characterized in that, The connecting channel connecting the circulation chamber and the combustion chamber is open in the frame, and a flame guide is disposed between the burner and the connecting channel. The second air intake and the upper space of the flame guide form a flow path that is connected to each other.

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