Cooking equipment

Abstract

The utility model relates to cooking equipment. The cooking equipment can comprise a frame (60), a cooking chamber (S1) and a cooking chamber (S2), and a circulation device (C) disposed inside the frame (60). A circulation chamber (SA) communicating with the cooking chamber (S1) can be arranged inside the circulation device (C). A heating device (100) for supplying heated air to the circulation chamber (SA) can be arranged outside the frame (60). The heating device (100) may comprise a burner housing (110) disposed at the lower part of the circulation device (C) and having a combustion chamber (S5) disposed therein, the combustion chamber (S5) being connected to the circulation chamber (SA). The heating device (100) may include a burner (120) that heats air flowing into the combustion chamber (S5).

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 an equipment 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 food. A cooking chamber is provided in the closed type cooking equipment, which is a space that receives food and is shielded when cooking food.

[0004] In the cooking equipment using gas stove as 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 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 convection fan works, air is sucked in the direction of the convection fan, and the flame of the burner also faces 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 sucked by the convection fan. This problem can be solved by providing an additional flame stabilizer between the burner and the convection fan, so that the flow of air caused by the convection fan does not directly affect the burner.

[0007] However, since the existing cooking equipment needs such additional components as the heat shield and the 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 speed of the convection fan can be reduced or the convection fan can be intermittently operated. However, if the speed of the convection fan is reduced or the convection fan is intermittently operated, 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 convection 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. In particular, the frame constituting the cooking chamber can be deformed by high heat or the enamel coating of the frame can be damaged. Thus, in addition to heating the air, heating the surrounding components, there is a problem in that the durability of the surrounding components and the thermal efficiency of the heating device are reduced. SUMMARY

[0012] PROBLEMS TO BE SOLVED BY THE INVENTION

[0013] The present invention is to solve the problems of the prior art as described above, and the object of the present invention is to separate the heating device that heats air and the circulating device for circulating air of the cooking chamber and dispose them in separate spaces.

[0014] Another object of the present invention is to supply air heated by the heating device to the inside of the cooking chamber even when the circulating fan is not operated.

[0015] Another object of the present invention is to dispose 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.

[0016] Another object of the present invention is to concentrate the flame generated in the heating device to the air supplied from the heating device toward the circulating device.

[0017] MEANS FOR SOLVING THE PROBLEMS

[0018] According to features of the present application for achieving the above-described objects, the present application can include a frame formed with a cooking chamber and a circulation device disposed inside the frame. The inside of the circulation device can be formed with a circulation cavity communicating with the cooking chamber. The outside of the frame can be formed with a heating device supplying heated air to the circulation cavity. The heating device can include a burner case disposed at the lower portion of the circulation device and formed with a combustion cavity connected to the circulation cavity. The heating device can include a burner heating air flowing into the combustion cavity. In this way, the burner can be disposed inside the burner case, which is a space separate from the circulation device. Thus, 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.

[0019] Further, a connection passage connecting the circulation cavity and the combustion cavity can be open in the cooking chamber. The heating device can be disposed opposite the circulation device across the connection passage. At this time, 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.

[0020] In addition, the connection passage of the frame can be disposed at the bottom surface of the frame. The circulation device can be disposed at the upper portion of the bottom surface of the frame. The heating device can be disposed at the lower portion of the bottom surface. At this time, air heated by the heating device can be supplied to the cooking chamber after being raised along the continuous flow path by natural ventilation.

[0021] Further, the circulation cavity can form a first flow path connected to the cooking chamber. The combustion cavity can form a second flow path transferring air heated by the burner to the first flow path. 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 disposed at the bottom surface of the frame.

[0022] In addition, the flame hole of the burner can be open toward the second flow path. In this way, since the flame hole of the burner is open toward the flow path rather than toward the wall surface or the case of the cooking chamber, there is no need to worry about the surrounding components being overheated by the burner.

[0023] Further, an outer case surrounding the frame can also be included. The setting space can be disposed between the frame and the outer case. The heating device can be disposed in the setting space. In this way, since the heating device is disposed 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.

[0024] In addition, the burner can be a linear tube structure extending in one direction along a rear edge of a lower portion of the frame. Thus, the front-rear direction space occupied by the burner can be reduced.

[0025] Further, a heating flow path guiding the heated air toward the circulation chamber can be formed in the combustion chamber. The burner can be disposed at a position apart from the heating flow path. The burner can generate a flame in the direction of the heating flow path.

[0026] In addition, a connection passage connecting the circulation chamber and the combustion chamber can be opened in the cooking chamber. A flame guide can be disposed between the burner and the connection passage. The flame guide can guide the generation direction of the flame of the burner.

[0027] Further, the flame guide can be disposed in an upwardly inclined direction from the burner toward the connection passage. A lower portion of the flame guide and a bottom surface of the burner housing can form a heating flow path guiding the heated air.

[0028] In addition, the burner can generate a flame in a first direction, and the circulation device and the heating device can be stacked in a second direction orthogonal to the first direction. Thus, a wider space can be secured in front of the first direction, and thus a sufficient amount of air can be heated and supplied to the circulation device.

[0029] Further, the circulation device and the heating device can be fixed to surfaces of the frame at different positions, respectively. In addition, the circulation device and the heating device can be combined to the frame in a state in which surfaces of the circulation device and the heating device are not in contact with each other. Thus, conduction heat transferred from the heating device to the circulation device is greatly reduced, the energy efficiency of the cooking apparatus is improved, and the durability of the circulation device can be improved.

[0030] Further, the circulation device can be fixed to a first surface of a wall surface of the frame facing the cooking chamber, and the heating device can be fixed to a second surface of the wall surface of the frame opposite to the first surface.

[0031] In addition, a portion of the burner housing can be open toward the connection passage. Further, a portion of the burner housing can protrude into the inside of the circulation chamber portion through the connection passage to form a protruding portion. The protruding portion can be provided with a heated air outlet portion open toward the circulation chamber. The protruding portion can prevent leakage of the heated air.

[0032] In addition, the circulation device can be provided with a cover plate provided in front of a wall surface of the cooking chamber. The cover plate can be provided with an intake hole for intake of air from the cooking chamber, and the cover plate can form the circulation cavity with the wall surface of the cooking chamber. The circulation device can include a partition plate provided between the cover plate and the wall surface of the cooking chamber. The partition plate can partition the circulation cavity into a heating cavity and a discharge cavity, and a communication hole connecting the heating cavity and the discharge cavity can be open in the partition plate. The combustion cavity can be connected to the heating cavity. The discharge cavity can be provided with a circulation fan for circulating air from the cooking chamber.

[0033] In addition, a discharge hole for discharging air from the discharge cavity to the cooking chamber can be open in the discharge cavity.

[0034] In addition, a rotation axis of the circulation fan can be provided in parallel with a direction in which the flame hole of the burner is open.

[0035] In addition, the burner can be provided at a position separated from the heating cavity in a direction in which the combustion cavity and the heating cavity are connected to each other.

[0036] In addition, all or a part of the burner can be provided at a position overlapping the discharge cavity in a direction in which the combustion cavity and the heating cavity are connected to each other.

[0037] In addition, a guide duct can be provided in the burner housing at a position spaced apart in a direction in which the flame hole of the burner is open. A heating flow path connecting between the combustion cavity and the heating cavity can be provided inside the guide duct.

[0038] In addition, a back panel surrounding the frame can be further included. The heating device can be more protruded toward a surface direction of the back panel than the circulation device.

[0039] In addition, the burner housing can include a front panel constituting a front surface of the combustion cavity, a side panel constituting a side surface of the combustion cavity, a top panel constituting a top surface of the combustion cavity, and a bottom panel constituting a bottom surface of the combustion cavity. A cavity opening portion opening the combustion cavity toward a rear of the burner housing can be provided in the burner housing.

[0040] In addition, the top panel or the bottom panel can be spaced apart from the housing, and a second air intake portion can be formed between the top panel or the bottom panel and the housing. The second air intake portion can be connected to the cavity opening portion.

[0041] Further, the cavity opening part can be connected with a panel opening part opened in the housing. All or a part of the panel opening part can be shielded by a shield cover of the housing.

[0042] In addition, the top panel can be provided with a top opening part connected with the connection passage.

[0043] Further, the side panel can be provided with a bracket hole through which a bracket part of the burner passes.

[0044] In addition, the burner housing can be provided with a fixing rib in which a part of the top panel is bent toward the bottom panel. One end part of the burner can be combined with the fixing rib.

[0045] Effects of the Invention

[0046] As described above, the cooking apparatus of the present application has the following effects.

[0047] In the present application, the burner is provided in the lower part of a circulation device that circulates air in the cooking chamber, and can be provided in the inside of a burner housing that is a space independent 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 needed, and a heat shield plate 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 parts and assembly man-hours and reducing manufacturing costs.

[0048] In addition, since the burner is provided in a space independent from the circulation fan, there is no need to worry that the operation of the circulation fan will destabilize the combustion of the burner. Thus, the burner can generate a more stable flame, and as a result, the cooking performance of the cooking apparatus can be improved.

[0049] In addition, since the circulation fan is not affected by the destabilization of the combustion of the burner, the air volume of the circulation fan can be varied during the combustion of the burner. Thus, the cooking apparatus can provide more diverse cooking methods to the user.

[0050] Further, in the present application, since the heating device is provided in the lower part 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.

[0051] In addition, in the present application, the circulating device and the heating device can be arranged at different heights and in the height direction (up-down direction). In this way, the flow path inside the circulating device and the flow path inside the heating device can form a continuous flow path in the up-down direction. The air heated by the heating device can be lifted along the continuous flow path by natural draft and then supplied to the cooking chamber. Therefore, even in the state that the circulating fan does not work, the heated air can be supplied to the cooking chamber, so the present application can provide more diverse cooking modes.

[0052] Furthermore, in the present application, the heating device can be arranged outside the cooking chamber, i.e., at the lower part of the frame. In this way, since the cooking chamber is completely independent of the heating device, the interior of the cooking chamber can be designed more freely.

[0053] At this time, in the present application, the heating device is arranged at the lower part of the circulating device, and the entire lower part of the circulating device can overlap the upper part of the heating device. In this way, the front-rear direction (the depth direction of the cooking chamber) length of the circulating device and the heating device can be minimized, thereby enabling the cooking apparatus to be miniaturized. In addition, if the entire lower part of the circulating device overlaps the upper part of the heating device, the air movement path between the heating device and the circulating device becomes shorter, thereby enabling heat loss to be reduced.

[0054] Furthermore, in the present application, the heating device can be arranged at the lower part of the discharge cavity of the circulating device. In this way, 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. In this way, the thermal efficiency of the cooking apparatus can be improved.

[0055] 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. In this way, the interior of the cooking chamber has the effect of improving the degree of freedom of design.

[0056] In addition, if the heating device is arranged at the lower part of the frame, the air between the frame and the shell can naturally cool the heating device. In this way, the effect of improving the cooling efficiency of the heating device is also achieved.

[0057] Furthermore, 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, thereby enabling the durability of the cooking apparatus to be improved.

[0058] In particular, in the present application, the heating device and the circulating device can be coupled to the frame without directly contacting each other. In this way, the conduction heat transmitted from the heating device to the circulating device is greatly reduced, thereby enabling the energy efficiency of the cooking apparatus to be improved, and the durability of the circulating device to be improved.

[0059] In addition, in the present application, the flame hole of the burner can be open to the flow path connected from the heating device to the circulation device. Thus, the flame generated in the burner can be concentrated to the air supplied from the heating device to the circulation device, so that the air inside the cooking chamber can be heated faster to improve the cooking performance.

[0060] 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 surrounding components will be overheated by the burner.

[0061] In addition, in the present application, since the heating device is arranged at a position away from the cooking chamber, it can prevent food residues and the like from flowing into the heating device during the cooking of food. Thus, the durability of the heating device can be improved.

[0062] Furthermore, in the present application, a first air inlet portion through which outside air directly flows to the burner of the heating device and a second air inlet portion through which outside air additionally flows to the gap between the heating device and the outer shell can be arranged. 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. Thus, the heating performance of the cooking apparatus can be improved.

[0063] At this time, in the present application, the combustion chamber inside the heating device is raised to the upper heating chamber by the air heated by the burner to become a negative pressure state. Due to the negative pressure of the combustion chamber, the outside air can be naturally sucked into the combustion chamber through the second air inlet portion and used as secondary air. In this way, in the present application, even if an additional fan for the suction of secondary air is not provided, the outside air can be sucked, 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.

[0064] In addition, in the present application, a flow path guide is arranged in the heating device, so that the inside of the heating device can be divided into a heating flow path and a cooling flow path. The heating flow path and the cooling flow path can respectively become a passage for high-temperature air to be heated and a passage for relatively low-temperature air. Thus, the heating device and the surrounding parts of the heating device can be cooled, and the durability of the cooking apparatus can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0065] Figure 1 is a perspective view showing an embodiment of the cooking apparatus of the present application.

[0066] Figure 2 is a perspective view showing the inside of the cooking chamber of the oven part constituting an embodiment of the present application.

[0067] Figure 3is a front view showing the inside of the cooking chamber of the oven section of which the stove section and the drawer section are removed, which constitutes an embodiment of the present utility model.

[0068] Figure 4 is a rear view showing the rear of the oven section of which the stove section and the drawer section are removed, which constitutes an embodiment of the present utility model.

[0069] Figure 5 is a rear view showing the form of which the cover plate is removed from Figure 4 .

[0070] Figure 6 is a perspective view showing the components of the oven section which constitutes an embodiment of the present utility model.

[0071] 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 section which constitutes an embodiment of the present utility model.

[0072] Figure 8 is a front view showing the section structure of which a part of the oven section is cut open to show the fan device and the heating device, which constitutes an embodiment of the present utility model.

[0073] Figure 9 is a sectional view along the line Ⅸ-Ⅸ' of Figure 2 .

[0074] Figure 10 is a sectional view showing the side structure of the oven section and the drawer section which constitutes an embodiment of the present utility model.

[0075] Figure 11 is a side view showing the circulating device and the heating device part in Figure 10 in an enlarged scale.

[0076] Figure 12 is a perspective view showing the circulating device and the heating device part in Figure 10 in an enlarged scale.

[0077] Figure 13 is a perspective view showing the structure of the heating device which constitutes an embodiment of the present utility model.

[0078] Figure 14 is a perspective view showing the structure of the heating device which constitutes an embodiment of the present utility model from a different angle from Figure 13 .

[0079] Figure 15 is a front view showing the structure of the burner among the components of the heating device which constitutes an embodiment of the present utility model.

[0080] Figure 16is a top view showing the structure of the heating device constituting an embodiment of the present utility model.

[0081] Figure 17 is a rear view showing the structure of the heating device constituting an embodiment of the present utility model.

[0082] Figure 18 is a sectional view taken along the line XVIII-XVIII' of Figure 3 .

[0083] Figure 19 is a perspective view showing the aspect of Figure 18 from another angle.

[0084] Figure 20 is a perspective view showing the aspect of Figure 19 as viewed from a different angle. Figure 18 .

[0085] Figure 21 is a sectional view taken along the line XXI-XXI of Figure 3 .

[0086] Figure 22 is a perspective view showing the rear lower structure of the oven section constituting an embodiment of the present utility model.

[0087] Figure 23 is a sectional view taken along the line XXIII-XXIII' of Figure 22 .

[0088] Figure 24 is a perspective view showing the rear lower structure of the oven section constituting a second embodiment of the present utility model.

[0089] Figure 25 is a sectional view taken along the line XXV-XXV' of Figure 24 .

[0090] Figure 26 is a sectional view showing the structure of the heating device constituting a third embodiment of the present utility model.

[0091] Figure 27 is a sectional view showing the structure of the heating device constituting a fourth embodiment of the present utility model.

[0092] Figure 28 is a perspective view showing the structure of the burner and the guide duct among the components of the heating device constituting a fourth embodiment of the present utility model.

[0093] Figure 29 is a perspective view showing the structure of the guide duct among the components of the heating device constituting a fourth embodiment of the present utility model.

[0094] Figure 30 is a side view showing the structure of the guide duct in the components of the heating device constituting the fourth embodiment of the present utility model.

[0095] Figure 31 is a sectional view showing the structure of the heating device constituting the fifth embodiment of the present utility model.

[0096] Figure 32 is a perspective view showing the structure of the burner and the guide duct in the components of the heating device constituting the fifth embodiment of the present utility model.

[0097] Figure 33 is a side view showing the structure of the guide duct in the components of the heating device constituting the fifth embodiment of the present utility model.

[0098] Figure 34 is a plan view showing the structure of the flame guide in the components of the heating device constituting the sixth embodiment of the present utility model.

[0099] Figure 35 is a sectional view showing the structure of the burner and the flame guide in the components of the heating device constituting the sixth embodiment of the present utility model.

[0100] Figure 36 is a plan view showing the structure of the flame guide in the components of the heating device constituting the seventh embodiment of the present utility model.

[0101] Figure 37 is a sectional view showing the structure of the burner and the flame guide in the components of the heating device constituting the seventh embodiment of the present utility model.

[0102] BRIEF DESCRIPTION OF DRAWINGS

[0103] 10: housing, 11: front panel, 12: side panel, 13: electrical chamber, 20: back panel, 23: panel opening portion, 28: cover, 30: cooktop portion, 40: drawer portion, 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 bent portion, 74: communication hole, 75: first discharge hole, 80: cover plate, 81: cover body, 82: cover bent 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

[0104] 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 numerals are given to the same constituent elements even on different drawings as much as possible. In addition, in the process of explaining the embodiments of the present application, detailed explanations of related known constituents or functions are omitted in cases where it is judged that the detailed explanations will hinder the understanding of the embodiments of the present application.

[0105] 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 a 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, explanations will be made based on such directions.

[0106] Referring to Figure 1 and Figure 2The 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. The inside of the housing 10 can be configured with an oven unit as will be described below.

[0107] In the present embodiment, the upper portion of the cooking appliance can be configured with a cook-top unit 30, and the lower portion can be configured with a drawer unit 40. The cook-top unit 30 can constitute the upper portion of the housing 10. The drawer unit 40 can constitute the lower portion of the housing 10. The oven unit can be configured between the cook-top unit 30 and the drawer unit 40. As another example, either one of the cook-top unit 30 and the drawer unit 40 can be omitted, or both can be omitted.

[0108] Upon close observation of the structure of the housing 10, the housing 10 can be provided in a form of a substantially regular hexahedral shape. In order to protect a plurality of components provided in the internal space of the housing 10, the housing 10 is formed of a material having a predetermined hardness. The inside 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.

[0109] Referring to Figure 2 , the housing 10 can include a front panel 11, side panels 12, and a rear panel 20. The front panel 11 is a portion exposed when the door 50 is opened, and can constitute the front of a frame 60 to be described later. The side panels 12 can cover the left and right sides of the frame 60. Referring to Figure 10 , the lower portion of the drawer unit 40 can be configured with a bottom panel 17 constituting the housing 10.

[0110] The front panel 11 can be coupled to the front of the frame 60 to be described later. The front panel 11 can be configured to surround the entrance edge of a cooking chamber S1 provided inside the frame 60. If the door 50 is closed, the rear surface of the door 50 can be in close contact with the front panel 11.

[0111] 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. The 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.

[0112] 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 and the back of the frame 60 can be separated. Thus, the back panel 20 and the back of the frame 60 can be separated from each other. The space thus separated can become an insulation space S4 filled with insulation material (see reference). Figure 10 The structure will be explained again below.

[0113] Reference Figure 4 The diagram shows the shape of the rear panel 20 as viewed from the rear. The surface of the rear panel 20 may be provided with a plurality of holes. A portion 25a of these holes may be provided with a motor (not shown) for locking the door 50. Another portion 25b of these holes may be connected to a grill burner H (see reference 1) located above the cooking chamber S1. Figure 8 The piping supplying fuel can also serve as a port for mounting a thermistor (not shown).

[0114] The rear panel 20 may be provided with a panel opening 23. The panel opening 23 may extend through the rear panel 20. The panel opening 23 may expose a heating device 100 disposed on the inner side of the housing 10. The panel opening 23 may be configured to be at the same height as the heating device 100. The panel opening 23 may be configured to be located lower than the bottom surface of the frame 60.

[0115] The panel opening 23 can be covered by a cover 28. Figure 4 The diagram shows the panel opening 23 being covered by the shielding cover 28. In this embodiment, the shielding cover 28 is shown not completely covering the panel opening 23, leaving a portion open. This open portion exposes a portion of the heating device 100, including the nozzle holder 127 for injecting gas into the burner 120.

[0116] like Figure 5 As shown, if the cover 28 is removed, more of the heating device 100 can be exposed to the rear. A large portion of the burner 120 constituting the heating device 100 can be exposed through the panel opening 23. An operator can remove the cover 28 to access the heating device 100 for maintenance. Alternatively, the cover 28 can be removed to assemble the burner 120 within the heating device 100.

[0117] 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.

[0118] Referring again to Figure 1 , the oven portion 30 can include a plurality of oven burners 35. The oven burners 35 can directly heat a container or food, which contains food, using a flame F (see Figure 18 ) generated by burning gas, thereby cooking the food. Reference numeral 32 shows a top grate on which a container or the like is placed. As another example, the oven portion 30 can include one or more electric heaters. As another example, the oven portion 30 can include an induction heating (IH) burner using an induced current generated by a magnetic field as a heat source. As another example, the oven portion 30 can be omitted.

[0119] 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.

[0120] As shown in Figure 1 , the front of the oven portion 30 can be provided with a control panel 55. The control panel 55 can be provided with a knob 57 for operating the oven 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 a state of the cooking apparatus.

[0121] 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 a 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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 to the inside of the cooking chamber S1.

[0128] 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.

[0129] 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 to 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.

[0130] 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.

[0131] 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

[0132] With reference to FIG. 1, the inside of the circulation device C can be provided with a circulation cavity SA. 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

[0133] 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. Figure 1

[0134] ​​​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.

[0135] 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 bending portion 72 at an edge thereof. The partition bending 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 bending 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.

[0136] 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.

[0137] The partition bending 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 bending 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.

[0138] 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.

[0139] The cover plate 80 is a metal material, and a 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 an edge thereof. The cover bending portion 82 can form a front-rear direction thickness of the cover plate 80. A cover fastening end 83 provided at an 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.

[0140] On the other hand, a lower end of the cover plate 80 and a 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.

[0141] 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.

[0142] 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 a front-rear direction. The suction hole 84 can be a hole for suction of 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 an inner side 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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, 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.

[0157] 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.

[0158] Referring to Figure 11 , arrows indicate the flow of air based on the circulation device C and the heating device 100. First, observing the flow of air based on the circulation device C, 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).

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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 , the 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 rear panel 20.

[0165] 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 the 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 111a (refer to Figure 13 ) in this process, 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 can be prevented (refer to arrow ⑦).

[0166] Meanwhile, another portion of the 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 arrow ⑧). At this time, air flowing toward the upper portion of the cooking chamber S1 (arrow ⑧) 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 ). This structure is described again below.

[0167] 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 chamber S2 (arrow ① direction), and the heating chamber S2 is filled with air heated by the heating device 100. Thus, the air of the cooking chamber S1 can be heated while 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.

[0168] The flame generated by the burner 120 can heat the air of the combustion chamber 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 chamber S2. More precisely, the air of the combustion chamber 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 chamber S2 through the connection passage 61a provided to the frame bottom surface portion 61.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] Referring to Figure 13 to Figure 17 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] The frame back surface 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 surface portion 65 can cover the top surface opening portion 116. The portion bent forward from the lower end of the frame back surface portion 65 can overlap the upper portion of the frame bottom surface portion 61. The distal end of the frame back surface 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.

[0189] 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.

[0190] 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.

[0191] 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 overlapping 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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 regarded 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.

[0197] Figure 19 The middle arrow ④ shows the direction of the flow of air that cools the outside of the bottom plate 117 through the concave-convex portion 117a. The outside air can contact the bottom plate 117 by passing through the air inflow passage SP. In this way, the air that has cooled the bottom plate 117 can continue to move along the air inflow passage SP and enter the combustion chamber S5 through the gap between the burner case 110 and the back panel 20, i.e., the second air inlet portion IP2. This structure will be described again below.

[0198] The frame bottom portion 61 can be provided with a combustion air hole 119. The combustion air hole 119 can be formed by penetrating the frame bottom portion 61 in the up-down direction. The combustion air hole 119 can be connected to a holder air hole 127a' of a nozzle holder 127 that will be described below. Air that flows in through the combustion air hole 119 is supplied to the nozzle through the holder air hole 127a' and can be used for primary combustion of gas. Therefore, the combustion air hole 119 can constitute the first air inlet portion.

[0199] Next, referring to Figure 15 The burner 120 that constitutes the heating device 100 will be described. For reference, Figure 15 The middle shows a form in which the burner 120 incorporates a flame guide 140 that will be described later. As can be seen from this, the burner 120 can have a straight pipe structure that extends in one direction along the rear edge of the lower portion of the frame 60. The burner body 121 that forms the skeleton of the burner 120 can have a bar form that extends in one direction. The burner body 121 can extend in the length direction of the burner case 110. A gas flow path 121a to which mixed gas is supplied can extend in the front-rear direction inside the burner body 121.

[0200] The burner 120 can be disposed at a position that is separated from the heating flow path GP. The heating flow path GP is a movement path of air formed by a flow path guide 130 that will be described later and can be regarded as a passage that connects the combustion chamber S5 and the heating chamber S2. If such a burner 120 is disposed at a position that is separated from the heating flow path GP, the distance from the burner 120 to the heating flow path GP is secured, and a space in which air that will be heated by a flame can exist can be sufficiently formed. For this reason, the burner 120 can generate a flame in the direction of the heating flow path GP.

[0201] Referring to Figure 6 The burner 120 is connected to an ignition spark plug 122. The ignition spark plug 122 can cause the mixed gas to burn. The ignition spark plug 122 can be provided with a connector 122a that is connected to a power source (see FIG. 2) (refer to Figure 13). The connector 122a can be combined with a power supply part inside the housing 10.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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 only the remaining one can constitute the first air inlet portion IP1.

[0213] The nozzle holder 127 may have a gas inlet hole 127b. The gas inlet hole 127b may be connected to a gas pipe. In this embodiment, the gas inlet hole 127b opens in a different direction than the air hole 127a' of the holder. More precisely, the gas inlet hole 127b may face the panel opening 23 of the rear panel 20. Thus, the gas inlet hole 127b can be exposed to the outside through the panel opening 23. Figure 21 The middle arrow ④ indicates the path of external gas supply along the direction of the gas inlet hole 127b.

[0214] like Figure 21 As shown, the burner fixing piece 128, which is attached to the burner body 121, can be closely attached to the fixing rib 113b. The burner body 121 can be fixed to the burner shell 110 and the frame 60 by means of the burner fixing piece 128 and the bracket portion 129 on the opposite side, respectively.

[0215] Next, observe the flow path guide 130 that constitutes the heating device 100. Refer to the exploded view. Figure 7 The flow path guide 130 may have a generally hexahedral shape. Since the flow path guide 130 is housed within the combustion chamber S5, it may have a volume smaller than or the same as that of the combustion chamber S5. The flow path guide 130 may be formed separately from the burner housing 110 and then disposed within the combustion chamber S5. Alternatively, the flow path guide 130 may be integrally formed with the burner housing 110.

[0216] The flow path guide 130 can form a plurality of flow paths together with the burner housing 110. The flow path guide 130 can divide the combustion chamber S5 into a plurality of spaces to generate airflow towards each of the divided spaces. Here, division means that even if two spaces are not completely separated, air will flow separately into each space. As will be described later, the flow path guide 130 can divide the connecting channel 61a' into a heating air outlet 134 and cooling air outlets OP1 and OP2.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] The flow path guide 130 can be open upward and rearward, respectively. Here, upward means in the direction of the heating chamber S2. The rearward means in the direction of 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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 portion 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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).

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] Referring to FIG. 12 as a plan view, Figure 19 A 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.

[0237] 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.

[0238] 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 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.

[0239] 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 reference to the circulation device C.

[0240] 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. Thereby, 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.

[0241] 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.

[0242] 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.

[0243] 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 the guide end portion 145a of the flame guide 140, which will 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.

[0244] 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 a 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 air heated by the burner 120 toward the heating flow path GP. The guide fence 137 can cause 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.

[0245] 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 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.

[0246] Next, the flame guide 140 will be described. The flame guide 140 can guide the direction in which the flame of the burner 120 is generated. The flame guide 140 can guide the flow of air so that 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.

[0247] 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 air rising through the heating flow path GP intensively.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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 guide end portion 145a and the connection passage 61a can form the confluence portion (first spaced portion G1). Further, as another example, the flow path guide 130 can 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.

[0257] Due to the upwardly inclined structure of the guide vanes 145, the outside air space S6 can be an empty space that gradually narrows in width toward the guide end portion 145a. Thus, the air can be faster in speed as it gets closer to the guide end portion 145a. The air that has increased in speed can be smoothly delivered to the second cooling flow path CP2 or the first spaced portion G1.

[0258] The outside air space S6 can be 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.

[0259] 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.

[0260] At this time, the air confluenced at the heating flow path GP through the first spaced portion G1 can be brought into a once-heated state through heat exchange in the process of cooling the flame guide 140 as it passes through the flame guide 140. Thus, heat loss generated by the secondary air supplied from the outside can be minimized.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] 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 configured to be positioned in the rear of the housing 10.

[0271] On the other hand, the second air inlet portion IP2 can be connected to a cavity opening portion 118 formed in the burner housing 110. Since the cavity opening portion 118 is a portion opened in the rear of the burner housing 110, the second air inlet portion IP2 is connected to the cavity opening portion 118. Thus, the air flowing into the outside of the second air inlet portion IP2 can move toward the burner 120 through the cavity opening portion 118. Of course, as shown in FIG. 8, since the cavity opening portion 118 is blocked by the rear panel 20 or the cover 28, the flowing air does not leak to the rear and can be directed toward the burner 120. Figure 22

[0272] Referring to FIG. 9, an enlarged view of the second air inlet portion IP2 is shown. 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 positioned in the rear of the burner housing 110 closer to the rear panel 20 than the front plate 111 of the burner housing 110. Thus, the air from the outside can enter the second air inlet portion IP2 after being cooled by the air inflow passage SP in the bottom plate 117 and the concave-convex portion 117a. Figure 23

[0273] 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 rear panel 20. Thus, since the outside air first flows along the surface of the heating device 100 through the air inflow passage SP and then flows into the second air inlet portion IP2, the cooling function of the outside air can be effectively performed.

[0274] The second air inlet portion IP2 can be extended longer than the length of the burner 120 or the same length as the burner 120. Thus, the second air inlet portion IP2 can uniformly supply the secondary air to a wider area of the burner 120.

[0275] The second air inlet portion IP2 can be positioned closer to the housing 10 than the connection passage 61a. Thus, 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 positioned closer to the rear panel 20 than the connection passage 61a.

[0276] ​​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.

[0277] 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.

[0278] 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).

[0279] 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.

[0280] Figure 19 The 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.

[0281] 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.

[0282] 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, an additional flame stabilizing device (stabilizer) is not required, and a heat shield for protecting the inner wall of the cooking chamber S1 from the flame is also omitted.

[0283] 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 a state in which the circulating fan 93 is not operating, the heated air can be supplied to the cooking chamber S1.

[0284] 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 portion 131. Then, the air can enter the first cooling flow path CP1 formed between the front plate 111 and the guide front face portion 131 through the interval portion 111a (arrow ⑦ direction).

[0285] In addition, external air can also flow in through the second air inlet portion IP2 arranged at the upper part of the second air inlet portion 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 portion 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 portion IP2.

[0286] 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.

[0287] 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.

[0288] Referring to Figure 25 , the front of the cover hole 29 is provided with 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 air 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.

[0289] The cover hole 29 can have a long hole shape 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.

[0290] 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.

[0291] 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.

[0292] 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.

[0293] 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.

[0294] 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.

[0295] 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 CPI. 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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 burner cavity 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.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] The air guide hole 148 can be constituted in plural. In the present embodiment, the air guide hole 148 can be constituted in 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 flow more smoothly to a front of the burner 120 through the plural vane holes.

[0308] 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 contribute to 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 contribute to complete combustion of the mixed gas.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] 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 precisely, the air guide 146 can extend from the guide vane 145 in a cantilever form.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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 pertains 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 apparatus, wherein, The cooking apparatus includes: a frame formed with a cooking chamber; a circulation device disposed inside the frame, a circulation cavity being formed inside the circulation device and communicating with the cooking chamber; and a heating device disposed outside the frame to supply heated air to the circulation cavity; the heating device includes: a burner case disposed at a lower portion of the circulation device, a combustion cavity being formed inside the burner case and connected to the circulation cavity; and a burner disposed in the combustion cavity to heat air flowing into the combustion cavity.

2. The cooking apparatus according to claim 1, wherein a connection passage connecting the circulation cavity and the combustion cavity is open at the frame, and the heating device is disposed at opposite sides of the circulation device with the connection passage therebetween.

3. The cooking apparatus according to claim 2, wherein the connection passage of the frame is provided at a bottom surface of the frame, the circulation device is disposed at an upper portion of the bottom surface of the frame, and the heating device is disposed at a lower portion of the bottom surface of the frame.

4. The cooking apparatus according to claim 1, wherein the circulation cavity forms a first flow path connected to the cooking chamber; the combustion cavity forms a second flow path to transfer air heated by the burner to the first flow path; the first flow path and the second flow path are connected to each other in a height direction of the frame through the connection passage provided at the bottom surface of the frame.

5. The cooking apparatus according to claim 1, further comprising: a housing accommodating the frame; a setting space is provided between the frame and the housing, and the heating device is disposed in the setting space.

6. The cooking apparatus according to claim 1, wherein a back panel surrounding a back surface of the frame is disposed at a rear of the frame; the heating device is disposed in an area between a lower portion of the circulation device and a front of the back panel, and the burner is disposed in a direction parallel to a surface of the back panel.

7. The cooking apparatus according to claim 1, wherein the burner case is provided with a heating flow path to guide heated air toward the circulation cavity, and the burner is disposed at a position away from the heating flow path, and the burner generates a flame in a direction of the heating flow path.

8. The cooking apparatus according to claim 1, wherein a connection passage connecting the circulation cavity and the combustion cavity is open at the frame, and a flame guide is disposed between the burner and the connection passage.

9. The cooking apparatus according to claim 1, wherein the burner generates a flame in a first direction, and the circulation cavity and the combustion cavity form flow paths continuous with each other in a second direction orthogonal to the first direction.

10. The cooking apparatus according to claim 1, wherein the circulation device includes: a cover plate disposed in front of a wall surface of the cooking chamber, the cover plate being formed with a suction hole for suctioning air from the cooking chamber, and the cover plate forming the circulation cavity between the wall surface of the cooking chamber and the cover plate; and ​ ​ A partition plate is arranged between the cover plate and the wall surface of the cooking chamber, and the partition plate divides the circulation cavity into a heating cavity and a discharge cavity, and a communication hole connecting the heating cavity and the discharge cavity is open in the partition plate; The combustion cavity is connected with the heating cavity; A circulation fan for circulating air in the cooking chamber is arranged in the discharge cavity.

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