Cooking equipment

Abstract

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

Description

Technical Field

[0001] The present invention relates to a cooking device. Background Art

[0002] A cooking device is a type of cooking equipment used for cooking food, and is a device installed in a kitchen space to cook food. Depending on the heat source or form used, and the type of fuel, such cooking devices can be classified in various ways. If the cooking devices are classified according to the form of cooking food, they can be divided into an open-type cooking device and a closed-type cooking device according to the form of the space where the food is placed. Closed-type cooking devices include ovens, electromagnetic microwave ovens, etc., and open-type cooking devices include cooktops, griddles, etc.

[0003] A closed-type cooking device is a cooking device that uses a door to shield the space where the food is located and heats the shielded space to cook the food. A cooking chamber is provided in the closed-type cooking device, and the cooking chamber is a space for storing food and is shielded when cooking food.

[0004] In a cooking device using a gas stove as a heat source in a closed-type cooking device, a burner may be configured to heat the cooking object inside the cooking chamber. For example, a burner may be configured at the rear of the cooking chamber to heat the air. A circulation fan (convection fan) may be configured behind the burner to evenly transfer the air heated by the burner to the entire cooking chamber.

[0005] If the circulation fan operates, air is inhaled toward the circulation fan, and the flame of the burner also faces the rear wall surface of the cooking chamber. If this occurs, the wall surface of the cooking chamber may overheat, and a coating such as enamel may be damaged by the heat. To solve this problem, additional protection means such as a burner reflector need to be provided in the cooking device to protect the wall surface of the cooking chamber from the heat of the burner.

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

[0007] However, since existing cooking devices require such additional components as a heat shield and a flame stabilizer, there are problems such as an increase in the number of components and manufacturing costs, and a complex structure of the heating device, making it difficult to design the cooking device.

[0008] As another method, in order to stabilize the flame, the speed of the circulation fan can be reduced or the circulation fan can be made to operate intermittently. However, if the speed of the circulation fan is reduced or the circulation fan is made to operate intermittently in this way, there is also a disadvantage that more cooking methods cannot be achieved by the heating device.

[0009] In addition, the rear of the existing cooking device needs a setting space for a heating device including a burner. Therefore, there is a problem that the setting space of the heating device limits the depth of the cooking chamber in the front-rear direction. Moreover, there is also a problem that the volume of the cooking chamber is reduced due to the space occupied by additional components such as a heat shield plate and a flame stabilization device.

[0010] Moreover, since the fan cover covering the circulation fan also needs to block the heating device arranged at the rear, there are limitations in reducing the size of the fan cover, and there is a disadvantage that it is difficult to change the shape of the fan cover.

[0011] In addition, the burner arranged in the cooking device not only heats the air in the heating chamber, but also heats peripheral components such as the burner cover constituting the heating chamber together. Thus, when heating peripheral components together in addition to the air, there is a problem of reduced thermal efficiency of the heating device.

[0012] At this time, the burner may overheat the peripheral components, but there is no additional cooling device for preventing the overheating of the peripheral components except for the circulation fan, so there is also a problem of reduced durability of the cooking device.

[0013] Moreover, in order to generate a stable flame, the burner of the cooking device not only needs primary air directly supplied to the burner, but also needs secondary air supplied to the periphery of the flame holes. However, the existing cooking device has the following problem: only when the circulation fan operates to generate suction, the secondary air can be smoothly supplied to the periphery of the flame holes. If the circulation fan does not operate, the supply of the secondary air is restricted. Thus, there is a limitation in providing a function of cooking food with only the burner operating without the circulation fan operating. Summary of the Invention

[0014] Problems to be Solved by the Invention

[0015] The present invention is used to solve the problems of the above-mentioned prior art. The object of the present invention is to separate the heating device for heating air and the circulation device for circulating the air in the cooking chamber and arrange them in independent spaces.

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

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

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

[0019] Another object of the present invention is to dispose the heating device at the lower part of the cooking chamber so that the radiant heat of the burner does not transfer to the wall surface of the cooking chamber.

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

[0021] Means for Solving the Problem

[0022] According to the features of the present invention for achieving the above-described objects, the present invention may include a housing and a frame disposed inside the housing. A cooking chamber may be formed in the frame. The cooking device of the present invention may further include a circulation device having a circulation chamber communicating with the cooking chamber. A combustion chamber connected to the circulation chamber may be formed in the heating device. The heating device may be provided with a burner for heating the air flowing into the combustion chamber. At this time, a first intake part opening toward the surface of the burner may be disposed in the heating device. An outside air flowing in through the second intake part may be used as secondary air supplied to the burner, so that the complete combustion of the fuel gas can be smoothly achieved.

[0023] Moreover, the heating device may be disposed below the circulation device. With this structure, even when the fan (circulation fan) of the circulation device is driven, the flame of the burner is not affected by the fan, so that a flame stabilization device (stabilizer) and a heat shield for protecting the inner wall of the cooking chamber from the flame can be omitted.

[0024] In addition, a connection passage connecting the circulation chamber and the combustion chamber may be open in the frame. The heating device may be disposed on the opposite side of the circulation device across the connection passage. Thus, the flow path inside the circulation device and the flow path inside the heating device may form a flow path continuous with each other in the vertical direction. The air heated by the heating device may rise along the continuous flow path by natural draft and then be supplied to the cooking chamber.

[0025] Moreover, the second intake part may be arranged with the heating device and the surface of the housing facing the heating device being spaced apart from each other. Thus, since the second intake part is formed in the spaced part between two components, there is no need to provide additional piping or an additional air supply device in the cooking device to implement the second intake part.

[0026] In addition, the heating device may be arranged in one direction along the rear edge of the lower part of the frame. The second intake part may be arranged in the one direction between the heating device and the housing. Thus, the second intake part can be arranged in a long section, so that a larger amount of outside air can be supplied to the combustion device.

[0027] Moreover, the second intake part may be arranged in a direction parallel to the surface of the housing. Thus, outside air can move along the surface of the housing and can be naturally guided to the second intake part.

[0028] In addition, the second intake part may extend longer than the length of the burner.

[0029] Moreover, an air inflow passage for air to flow may be formed in the lower part of the heating device. The second intake part may be arranged at the end position of the air inflow passage. Thus, since the outside air first flows through the surface of the heating device along the air inflow passage and then flows into the second intake part, the cooling function based on the outside air can be effectively completed.

[0030] In addition, a rear panel constituting the housing may be arranged on the side opposite to the entrance of the cooking chamber. The second intake part may be arranged with the heating device and the rear panel being spaced apart from each other.

[0031] Moreover, a setting space may be arranged between the housing and the frame. The heating device may be arranged in the setting space. Thus, since the heating device is arranged outside the cooking chamber, the volume of the cooking chamber will not be reduced due to the space occupied by the heating device.

[0032] In addition, the housing may be provided with a panel opening part for opening the setting space to the outside of the housing. The panel opening part is shielded by a shielding cover, and a cover hole connected to the second intake part may be opened in the shielding cover.

[0033] In addition, the heating device may be arranged in the setting space between the housing and the frame. The setting space may form a continuous path from the lower part of the entrance of the cooking chamber to the rear surface part of the housing.

[0034] Furthermore, the heating device may be configured with a cavity opening that opens the combustion chamber toward the rear of the heating device. The second air intake portion may be connected to the cavity opening.

[0035] In addition, the cavity opening may form part of the first air intake portion.

[0036] Moreover, an air inflow passage may be configured at the lower part of the heating device. One end of the air inflow passage blocked by the housing may be configured with the second air intake portion.

[0037] In addition, the heating device may be configured with a concavo-convex portion protruding toward the air inflow passage. Moreover, the concavo-convex portion may be configured at the lower part of the burner. Since the concavo-convex portion protrudes toward the air inflow passage of the outside air, the contact area with the outside air can be increased.

[0038] In addition, the connection passage connecting the circulation chamber and the combustion chamber may be open in the frame. A flame guide may be configured between the burner and the connection passage. A flow path may be formed to connect the second air intake portion and the upper space of the flame guide.

[0039] Furthermore, the first air intake portion may be formed by penetrating a part of the heating device. The first air intake portion may be connected to the installation space.

[0040] In addition, the circulation chamber may form a first flow path connected to the cooking chamber. The combustion chamber may form a second flow path for delivering the air heated by the burner to the first flow path.

[0041] Moreover, the first flow path and the second flow path may be connected to each other in the height direction of the frame through a connection passage arranged on the bottom surface of the frame.

[0042] In addition, the burner generates a flame in a first direction, and the circulation chamber and the combustion chamber may form a flow path that is continuous with each other in a second direction orthogonal to the first direction.

[0043] Furthermore, the heating device may include a burner housing and the burner built therein. The burner housing may include a front panel constituting the front of the combustion chamber, a side panel constituting the side of the combustion chamber, a top panel constituting the top of the combustion chamber, and a bottom panel constituting the bottom of the combustion chamber. At this time, the second air intake portion may be arranged with a gap between one end of the bottom panel and the surface of the housing, or may be arranged with a gap between one end of the top panel and the surface of the housing.

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

[0045] Moreover, the heating device can be configured with a protruding portion that protrudes more toward the surface of the housing than the circulation device. The second air intake portion can be disposed between the end of the extension portion and the housing.

[0046] In addition, a pipe inlet portion connected to the gas flow path inside the burner can be opened at one end of the burner. The first air intake portion can penetrate the heating device and open toward the pipe inlet portion.

[0047] Advantages of the Invention

[0048] As described above, the cooking device of the present invention has the following effects.

[0049] In the present invention, the burner is disposed below the circulation device that circulates the air in the cooking chamber, and can be disposed inside the burner housing that is an independent space from the circulation device. With this structure, even when the fan (circulation fan) of the circulation device is driven, the flame of the burner is not affected by the fan. Therefore, a flame stabilization device (stabilizer) is not required, and a heat shield for protecting the inner wall of the cooking chamber from the flame can be omitted. As a result, there are effects of reducing the number of components and assembly man-hours of the cooking device and reducing the manufacturing cost.

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

[0051] Moreover, in the present invention, a first air intake portion through which outside air directly flows into the burner of the heating device and a second air intake portion through which outside air additionally flows into the gap between the heating device and the housing can be configured. The outside air flowing in through the second air intake portion is used as secondary air supplied to the burner, so that the complete combustion of the gas can be smoothly completed. Thereby, the heating performance of the cooking device can be improved.

[0052] At this time, in the present invention, the combustion chamber inside the heating device becomes a negative pressure state as the air heated by the burner rises toward the upper heating chamber. Due to the negative pressure of the combustion chamber, outside air can be naturally inhaled into the combustion chamber through the second air intake portion and used as secondary air. Thus, in the present invention, even without providing an additional fan for inhaling secondary air, outside air can be inhaled. Therefore, the number of components can be reduced and the structure can be simplified, and unnecessary energy for supplying secondary air can be reduced.

[0053] In addition, even if the circulation fan of the circulation device does not work, outside air can still flow into the heating device. Therefore, the present invention can also provide a cooking method that only uses the heating device without using the circulation fan. Thus, if the cooking device of the present invention is used, food can be cooked in more ways.

[0054] Moreover, the second air intake part can extend along the lower rear edge of the frame at the part where the heating device and the housing are separated from each other. Thereby, the second air intake part can be arranged in a long section, so that a larger amount of outside air can be supplied to the combustion device. Thus, complete combustion of the burner can be effectively achieved.

[0055] In addition, in the present invention, the second air intake part can be respectively arranged between the lower end part of the heating device and the housing, and between the upper end part of the heating device and the housing. This structure guides outside air from various directions, so that a sufficient amount of air required for the burner to exert its combustion function can be provided.

[0056] Moreover, in the present invention, the second air intake part can be arranged at the part where the heating device and the housing are separated from each other. In this way, since the second air intake part is formed at the separated part between the two components, there is no need to provide additional piping or an additional air supply device in the cooking device to realize the second air intake part. Therefore, the present invention has the effects of simple structure for adding the second air intake part and reduced processing costs.

[0057] In addition, in the present invention, the second air intake part can be arranged along the surface of the housing. The outside air moves along the surface of the housing and can be naturally guided to the second air intake part. Thereby, a smooth supply of secondary air can be achieved.

[0058] Moreover, the heating device of the present invention can be arranged in the installation space formed between the frame defining the cooking chamber and the housing surrounding the frame. Since the outside air flows in the installation space and cools the surface of the heating device, the cooling performance of the heating device can be improved and the durability can be enhanced.

[0059] In addition, the outside air flowing in the installation space can flow into the heating device through the second air intake part from the end position of the air inflow passage blocked by the housing. Thereby, the outside air first passes along the air inflow passage through the surface of the heating device and then flows into the second air intake part, so that the cooling function of the outside air can be effectively realized.

[0060] Moreover, in the present invention, uneven parts can be arranged at the lower part of the heating device. Since the uneven parts protrude towards the air inflow passage direction of the outside air, the contact area with the outside air can be increased. Through the heat exchange between the outside air and the uneven parts, the heating device can be cooled more effectively.

[0061] Moreover, in the present invention, since the heating device is disposed at the lower part of the cooking chamber, the volume of the cooking chamber will not be reduced due to the space occupied by the heating device. Therefore, it is possible to ensure that the size of the cooking chamber is relatively larger, and based on the same size of the cooking chamber, the cooking device can be miniaturized.

[0062] In addition, in the present invention, the circulation device and the heating device can be arranged at different heights in the vertical direction. In this way, the flow path inside the circulation device and the flow path inside the heating device can form a continuous flow path in the vertical direction. The air heated by the heating device can rise along the continuous flow path by natural draft and then be supplied to the cooking chamber. Therefore, even when the circulation fan is not working, heated air can be supplied to the cooking chamber, and thus the present invention can provide more diverse cooking modes.

[0063] At this time, in the present invention, the heating device is disposed at the lower part of the circulation device, and the whole lower part of the circulation device can overlap with the upper part of the heating device. In this way, the length of the circulation device and the heating device in the front-rear direction (the depth direction of the cooking chamber) can be minimized, so that the cooking device can be miniaturized. Additionally, if the whole lower part of the circulation device overlaps with the upper part of the heating device, the air movement path between the heating device and the circulation device becomes shorter, thereby reducing heat loss.

[0064] Moreover, in the present invention, the heating device can be disposed at the lower part of the discharge chamber of the circulation device. Thus, the heat inside the heating device radiates to the discharge chamber, and the air in the discharge chamber can be supplied to the cooking chamber in a more heated state. Thereby, the thermal efficiency of the cooking device can be improved.

[0065] In addition, since there is no heating device inside the cooking chamber, components such as the fan cover do not need to be overly large to shield the heating device, nor do they need to correspond to the shape of the heating device. Thus, there is an effect of improving the degree of freedom in the internal design of the cooking chamber.

[0066] Moreover, by disposing the heating device outside the cooking chamber, the radiant heat of the burner will not be directly transferred to the wall surface of the cooking chamber, thereby improving the durability of the cooking device.

[0067] In particular, in the present invention, the heating device and the circulation device can be respectively coupled to the frame without being in direct contact with each other. Thus, the conductive heat transferred from the heating device to the circulation device is greatly reduced, thereby improving the energy efficiency of the cooking device and also improving the durability of the circulation device.

[0068] In addition, in the present invention, the flame holes of the burner can be open toward the flow path connecting the heating device to the circulation device. Thus, the flame generated in the burner can be concentrated on the air supplied from the heating device to the circulation device, so that the air inside the cooking chamber can be heated more quickly, improving the cooking performance.

[0069] Moreover, since the flame holes of the burner face the flow path rather than the wall surface or the shell of the cooking chamber, there is no concern that the surrounding components will overheat due to the burner.

[0070] In addition, in the present invention, since the heating device is arranged at a position separated from the cooking chamber, it is possible to 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 is a perspective view showing an embodiment of the cooking device of the present invention.

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

[0073] Figure 3 is a front view showing the inside of the cooking chamber of the oven section removing the stove section and the drawer section constituting an embodiment of the present invention.

[0074] Figure 4 is a rear view showing the rear of the oven section removing the stove section and the drawer section constituting an embodiment of the present invention.

[0075] Figure 5 is shown from Figure 4 is a rear view showing the form removing the cover plate from

[0076] Figure 6 is a perspective view showing the components of the oven section constituting an embodiment of the present invention in an exploded manner.

[0077] Figure 7 is a perspective view showing the fan cover, the partition cover, the fan device, and the heating device among the components of the oven section constituting an embodiment of the present invention in an exploded manner.

[0078] Figure 8 is a front view showing the sectional structure of a part of the oven section of an embodiment of the present invention cut open to show the fan device and the heating device.

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

[0080] Figure 10 is a cross-sectional view of the side structure of the oven section and the drawer section of an embodiment of the present invention.

[0081] Figure 11 is an enlarged side view of the circulation device and the heating device part in Figure 10 .

[0082] Figure 12 is an enlarged perspective view of the circulation device and the heating device part in Figure 10 .

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

[0084] Figure 14 is a perspective view of the structure of the heating device constituting an embodiment of the present invention as observed from an angle different from Figure 13 .

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

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

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

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

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

[0090] Figure 20 is a perspective view of Figure 19 as observed from an angle different from Figure 18 .

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

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

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

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

[0095] Figure 25 It is a cross-sectional view taken along Figure 24 line XXV-XXV’ of

[0096] Figure 26 It is a cross-sectional view showing the structure of the heating device constituting the third embodiment of the present invention.

[0097] Figure 27 It is a cross-sectional view showing the structure of the heating device constituting the fourth embodiment of the present invention.

[0098] Figure 28 It is a perspective view showing the structure of the burner and the guiding pipe among the components of the heating device constituting the fourth embodiment of the present invention.

[0099] Figure 29 It is a perspective view showing the structure of the guiding pipe among the components of the heating device constituting the fourth embodiment of the present invention.

[0100] Figure 30 It is a side view showing the structure of the guiding pipe among the components of the heating device constituting the fourth embodiment of the present invention.

[0101] Figure 31 It is a cross-sectional view showing the structure of the heating device constituting the fifth embodiment of the present invention.

[0102] Figure 32 It is a perspective view showing the structure of the burner and the guiding pipe among the components of the heating device constituting the fifth embodiment of the present invention.

[0103] Figure 33 It is a side view showing the structure of the guiding pipe among the components of the heating device constituting the fifth embodiment of the present invention.

[0104] Figure 34 It is a top view showing the structure of the flame guide among the components of the heating device constituting the sixth embodiment of the present invention.

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

[0106] Figure 36 It is a top view showing the structure of the flame guide among the components of the heating device constituting the seventh embodiment of the present invention.

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

[0108] Description of Reference Numerals

[0109] 10: Outer shell, 11: Front panel, 12: Side panel, 13: Electrical chamber, 20: Rear panel, 23: Panel opening, 28: Shielding cover, 30: Stove part, 40: Drawer part, 50: Door, 60: Frame, 61: Frame bottom surface part, 61a: Connection channel, 62: Frame side surface part, 63: Frame top surface part, 65: Frame rear surface part 70: Partition board, 71: Partition body, 72: Partition bending part, 74: Communication hole, 75: First discharge hole, 80: Cover plate, 81: Cover body, 82: Cover bending part, 84: Suction hole, 85: Second discharge hole, 90: Fan assembly, 93: Circulation fan, 100: Heating device, 110: Burner housing, 111: Front plate, 111a: Spacing part, 112: Side plate, 113: Top plate, 115: Rear plate, 117: Bottom plate, 117a: Concave-convex part, 118: Chamber opening, 119: Combustion air hole, 120: Burner, 125: Flame hole, 130: Flow path guide, 131: Guide front surface part, 132: Guide side surface part, 133: Guide top surface part, 135: Guide rear surface part, 137: Guide fence, 140: Flame guide, 141: Fixed body, 145: Guide vane, C: Circulation device, CP1: First cooling flow path, CP2: Second cooling flow path, GP: Heating flow path, SP: Air inflow channel, IP1: First intake part, IP2: Second intake part. Detailed Description of the Invention

[0110] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in the process of attaching reference numerals to the components of each drawing, for the same component, even if it is shown in different drawings, the same reference numeral should be used as much as possible. In addition, in the process of describing the embodiments of the present invention, if it is determined that the specific description of related well-known components or functions will impede the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

[0111] The present invention relates to a cooking device. Here, the cooking device may refer to a device having a cooking chamber S1 inside. The cooking device of the present invention may be a closed-type cooking device in which the cooking chamber S1 is opened and closed by a door 50. In the following terms, the front indicates the direction towards the user when the user is in front of the cooking device. Refer to Figure 1 , the X-axis direction may be the front. The Y-axis direction may be the left-right width direction of the cooking chamber S1. The Z-axis direction may be the height direction of the cooking chamber S1. The following description will be based on this direction.

[0112] Refer to Figure 1 and Figure 2, the skeleton of the cooking device can be formed by the outer shell 10. The outer shell 10 can be regarded as the part exposed to the outside of the cooking device. The outer shell 10 can have a shape of a substantially hexahedron structure. The oven section described below can be arranged inside the outer shell 10.

[0113] In this embodiment, a cook-top unit 30 can be arranged at the upper part of the cooking device, and a drawer unit 40 can be arranged at the lower part. The cook-top unit 30 can form the upper part of the outer shell 10. The drawer unit 40 can form the lower part of the outer shell 10. The oven section can be arranged between the cook-top unit 30 and the drawer unit 40. As another example, either the cook-top unit 30 or the drawer unit 40 can be omitted, or both can be omitted.

[0114] Looking closely at the structure of the outer shell 10, the outer shell 10 can be set to include a shape of a substantially regular hexahedron. To protect a plurality of components arranged in the internal space of the outer shell 10, the outer shell 10 is formed of a material with a predetermined hardness. The oven section can be arranged inside the outer shell 10. The oven section can be shielded by the outer shell 10 and the door 50.

[0115] Referring to Figure 2 , the outer shell 10 can include a front panel 11, side panels 12, and a rear panel 20. The front panel 11 is the part exposed when the door 50 is opened and can form the front of a frame 60 described later. The side panels 12 can cover the left and right sides of the frame 60. Referring to Figure 10 , a bottom panel 17 forming the bottom of the outer shell 10 can be arranged at the lower part of the drawer unit 40.

[0116] The front panel 11 can be joined to the front of the frame 60 described later. The front panel 11 can be arranged to surround the entrance edge of a cooking chamber S1 arranged inside the frame 60. If the door 50 is closed, the back of the door 50 can be pressed against the front panel 11.

[0117] The side panels 12 can be arranged on both side surfaces of the frame 60. The side panels 12 can be arranged to be higher than the side surfaces of the frame 60. Thus, an electrical chamber 13 can be arranged between the two side panels 12. The electrical chamber 13 can provide a space for arranging electrical components between the cook-top unit 30 and the oven section. There can be a control panel 55 in front of the electrical chamber 13. A structure can be formed in which the control panel 55 shields the front of the electrical chamber 13.

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

[0119] Refer to Figure 4 , which shows the shape of the rear panel 20 as viewed from the rear. A plurality of holes may be provided on the surface of the rear panel 20. A motor (not shown) for locking the door 50 may be provided in a part 25a of the holes. Another part 25b of the holes may be connected to a pipe for supplying fuel to a grill burner H (refer to Figure 8 ) disposed above the cooking chamber S1, or may be a hole for setting a thermistor (not shown).

[0120] The rear panel 20 may be provided with a panel opening 23. The panel opening 23 may penetrate the rear panel 20. The panel opening 23 may expose a heating device 100 provided inside the housing 10. The panel opening 23 may be configured at the same height as the heating device 100. The panel opening 23 may be disposed below the bottom surface of the frame 60.

[0121] The panel opening 23 may be shielded by a shielding cover 28. Figure 4 Shows a state in which the panel opening 23 is shielded by the shielding cover 28. In the present embodiment, a state is shown in which the shielding cover 28 does not completely shield the panel opening 23 and a part is open. Through the open part, a part of the heating device 100 including a nozzle holder 127 for injecting gas into the burner 120 may be exposed.

[0122] As Figure 5 shown, if the shielding cover 28 is removed, more parts of the heating device 100 may be exposed to the rear. Most of the burner 120 constituting the heating device 100 may be exposed by the panel opening 23. The operator may remove the shielding cover 28 to approach the heating device 100, thereby maintaining the heating device 100. In addition, the shielding cover 28 may be removed to assemble the burner 120 in the heating device 100.

[0123] As described below, a cavity opening 118 connected to the panel opening 23 is provided in the burner housing 110. If the shielding cover 28 is removed, immediate access can be obtained to the interior of the burner housing 110, i.e., the combustion chamber S5. As another example, the shielding cover 28 may be omitted. As still another example, the shielding cover 28 may also be incorporated into the burner housing 110 instead of the rear panel 20. The shielding cover 28 will be described again below.

[0124] Referring again to Figure 1 , the stove unit 30 may include a plurality of stove burners 35. The stove burners 35 may use the flame F (refer to Figure 18 ) generated by burning gas to directly heat a container containing food or the food itself, thereby cooking the food. The reference numeral 32 denotes the top grate for placing a container or the like. As another example, the stove unit 30 may include one or more electric heaters. As another example, the stove unit 30 may include an induction heating (IH) burner that uses the induced current generated by a magnetic field as a heat source. As another example, the stove unit 30 may also be omitted.

[0125] The drawer unit 40 may be provided with a drawer handle 45. The drawer unit 40 may slide back and forth along the front-rear direction from the housing 10. The drawer unit 40 may function to keep a container containing food or the like at a predetermined temperature. Referring to Figure 10 , a storage space 43 for storing a container or the like inside the drawer unit 40 is shown. As another example, the drawer unit 40 may also be omitted.

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

[0127] The door 50 may shield the front of the cooking chamber S1. The door 50 may operate in a pull-down manner that rotates up and down with its lower end as the center and its upper end. As another example, the door 50 may also operate in a side-swing manner that opens to the side. The door 50 may have a structure that allows the interior of the cooking chamber S1 to be seen through. For example, the front surface 52 of the door 50 may have a panel structure made of glass, and the user can observe the interior of the cooking chamber S1 through the door 50. As another example, it may also be such that the interior of the cooking chamber S1 cannot be seen through the door 50 from the outside. The reference numeral 53 denotes a handle for opening and closing the door 50.

[0128] Referring toFigure 2 The bottom surface of the electrical chamber 13 may form the top surface portion of the frame 60. The electrical chamber 13 may be provided with an exhaust pipe 68. The exhaust pipe 68 may be provided to discharge the combustion gas generated during the process of cooking food inside the cooking chamber S1 to the outside of the cooking apparatus. The lower end portion of the exhaust pipe 68 may be connected to an exhaust port 64 that is open on the top surface portion of the frame 60, and the upper end portion may be disposed on the upper side of the back surface of the cooking apparatus.

[0129] Referring to Figure 3 Looking at the structure of the frame 60, the frame 60 may have a substantially hexahedral structure. The cooking chamber S1 may be provided inside the frame 60. The cooking chamber S1 may also be a substantially hexahedral structure like the frame 60. The frame 60 may be shielded by the outer casing 10 and the door 50. Most of the surface of the frame 60 except for the cooking chamber S1 may be blocked by the outer casing 10.

[0130] The frame 60 may include: a frame bottom surface portion 61 that forms the bottom surface of the cooking chamber S1; a frame side surface portion 62 that forms the side surface of the cooking chamber S1; a frame top surface portion 63 that forms the top surface of the cooking chamber S1; a frame back surface portion 65 that forms the back surface of the cooking chamber S1. Moreover, the front of the frame 60 may be open to expose the cooking chamber S1.

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

[0132] In addition, the heating device 100 described below may 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 surface portion 61, the frame side surface portion 62, the frame top surface portion 63, and the frame back surface portion 65. Thus, in this embodiment, the circulation device C and the heating device 100 are respectively disposed inside and outside with respect to the frame 60.

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

[0134] As Figure 3 shown, the heating device 100 may be disposed at the lower part of the frame 60. More precisely, the heating device 100 may be disposed below the frame bottom surface portion 61. The circulation device C is disposed inside the cooking chamber S1, and the heating device 100 is disposed at the lower part of the frame 60 outside the cooking chamber S1. Referring to Figure 10 , the heating device 100 may be disposed between the frame bottom surface portion 61 and the drawer cover 47 that constitutes the top surface of the drawer portion 40. If the drawer portion 40 is omitted, the heating device 100 may be disposed between the frame bottom surface portion 61 and the bottom surface panel 17.

[0135] Figure 7 shows a disassembled state of the rear panel 20, the frame 60, the circulation device C, and the heating device 100 that constitute the present invention. Looking at the circulation device C, the circulation device C can suck the air inside 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 thus mixed air into the cooking chamber S1. Such a process is carried out simultaneously and continuously, so that the air inside the cooking chamber S1 can be circulated.

[0136] The circulation device C and the heating device 100 can be connected through the connection passage 61a disposed in the frame 60 (refer to Figure 11)Connection. In this embodiment, the connection channel 61a penetrates through the bottom surface portion 61 of the frame and is formed. Based on the connection channel 61a, a circulation device C can be arranged in the upper part, and a heating device 100 can be arranged in the lower part. The connection channel 61a can be arranged at the rear of the bottom surface portion 61 of the frame near the back surface portion 65 of the frame. As another example, the connection channel 61a can be arranged on both sides of the bottom surface portion 61 of the frame near the side surface portion 62 of the frame. As another example, the connection channel 61a can be arranged on the side surface portion 62 of the frame. In this way, the heating device 100 can be arranged on the opposite side of the circulation device C across the side surface portion 62 of the frame.

[0137] The circulation device C can be arranged inside the cooking chamber S1. In this embodiment, the circulation device C is arranged in front of the back panel 20. The circulation device C can suck in air from the front to the rear (refer to Figure 1 the X-axis direction) of the cooking chamber S1 at the rear of the cooking chamber S1 and then discharge it to the side. A circulation fan 93 is arranged in the circulation device C, so that it can perform such suction and discharge functions. However, as will be described below, in this embodiment, since the heating device 100 can make the heated air rise through natural ventilation, even if the circulation fan 93 does not work, the heated air can be supplied to the cooking chamber S1.

[0138] Refer to Figure 9 , a circulation chamber SA can be arranged inside the circulation device C. The circulation chamber SA can be connected to the cooking chamber S1. The air sucked in from the cooking chamber S1 can exchange heat with the air heated by the heating device 100 in the circulation chamber SA. The heat-exchanged air can be discharged to the cooking chamber S1 again.

[0139] The circulation chamber SA can form an upper flow path connected to the cooking chamber S1. The upper flow path refers to the path that sucks in air from the cooking chamber S1 and then discharges it to the cooking chamber S1 again. The combustion chamber S5 inside the heating device 100, which will be described below, can form a lower flow path for delivering the 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 along the height direction of the frame 60 through the connection channel 61a arranged on the bottom surface portion 61 of the frame. Here, the height direction of the frame 60 refers to the up-and-down direction based on the figure, representing Figure 1 the Z-axis direction. This flow path structure will be described in detail again below.

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

[0141] The partition plate 70 is made of metal, and a partition body 71 may form a framework. The partition body 71 may have a substantially plate-like structure. Partition bending portions 72 may be disposed at the edges of the partition body 71. The partition bending portions 72 may constitute the thickness of the partition plate 70 in the front-rear direction. Partition fastening ends 73 disposed at the ends of the partition bending portions 72 may be fastened to the frame rear surface portion 65 in a state of overlapping with the cover fastening ends 83 of the cover plate 80.

[0142] The partition body 71 may be provided with communication holes 74. The communication holes 74 may be formed by penetrating the partition body 71 in the front-rear direction. The communication holes 74 may have a substantially circular structure. The communication holes 74 may be connected to the suction holes 84 of the cover plate 80. For this purpose, the communication holes 74 may be disposed at positions corresponding to the rear of the suction holes 84. Since a circulation fan 93 is disposed in the communication holes 74, the communication holes 74 may also be regarded as fan installation spaces.

[0143] A plurality of first discharge holes 75 may be formed in the partition bending portions 72. The first discharge holes 75 may be formed by penetrating the partition bending portions 72. The first discharge holes 75 may open in a direction different from the direction in which the communication holes 74 open. In this embodiment, the first discharge holes 75 may be opened laterally. The first discharge holes 75 may be connected to the second discharge holes 85 of the cover plate 80. The air heated by the heating device 100 may be supplied into the cooking chamber S1 through the first discharge holes 75 and the second discharge holes 85.

[0144] The partition plate 70 may partition the space between the cover plate 80 and the frame rear surface portion 65. A circulation chamber SA may be provided between the partition plate 70 and the frame rear surface portion 65, and the circulation chamber SA may be partitioned into two parts by the partition plate 70. More specifically, as Figure 9As shown, the circulation chamber SA can be partitioned, with reference to the partitioning plate 70, into a heating chamber S2 closer to the front of the cooking chamber S1 and an ejection chamber S3 at the rear. Here, the heating chamber S2 can become a space where the air heated by the heating device 100 and the air inhaled from the cooking chamber S1 are mixed. The ejection chamber S3 can become a space where the air mixed in the heating chamber S2 is ejected again into the cooking chamber S1. Of course, although a part of the air in the cooking chamber S1 can directly flow into the ejection chamber S3, if the circulation fan 93 operates, most of the air inside the ejection chamber S3 can be discharged into the cooking chamber S1.

[0145] The cover plate 80 is made of a metal material, and the cover body 81 can form a framework. The cover body 81 can have a substantially plate-like structure. A cover bending portion 82 can be arranged at the edge of the cover body 81. The cover bending portion 82 can form the thickness of the cover plate 80 in the front-rear direction. A cover fastening end 83 arranged at the end of the cover bending portion 82 can be fastened to the back surface portion 65 of the frame in a state where it coincides with the partitioning fastening end 73 of the partitioning plate 70.

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

[0147] Since the cover plate 80 is combined with the back surface portion 65 of the frame in a state of surrounding the partitioning plate 70, the partitioning plate 70 can be shielded by the cover plate 80. As Figure 3 shown, if the cooking chamber S1 is observed from the front, it becomes a state where only the cover plate 80 is exposed.

[0148] The cover body 81 can be provided with an inhalation hole 84. The inhalation hole 84 can be formed to penetrate the cover body 81 in the front-rear direction. The inhalation hole 84 can be a hole for inhaling the air inside the cooking chamber S1. The air inhaled into the inhalation hole 84 can flow into the heating chamber S2. In this embodiment, the inhalation hole 84 has a substantially circular structure. The inhalation hole 84 is formed in the form of a louver so as to be able to shield the structure of the partitioning plate 70, which is mostly inside the inhalation hole 84. As another example, the inhalation hole 84 can also have various forms such as a simple circular hole or a non-circular hole like the communication hole 74.

[0149] The suction hole 84 can be connected to the communication hole 74 of the partition plate 70. For this purpose, the suction hole 84 can be arranged at a corresponding position in front of the communication hole 74. A circulation fan 93 is arranged behind the suction hole 84, so that air can be sucked through the suction hole 84.

[0150] A plurality of second discharge holes 85 can be formed in the lid bending portion 82. The second discharge holes 85 can be formed through the lid bending 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 this embodiment, the second discharge holes 85 can be opened laterally. The second discharge holes 85 can be connected to the first discharge holes 75 of the partition plate 70. The air heated by the heating device 100 can be supplied into the cooking chamber S1 through the first discharge holes 75 and the second discharge holes 85.

[0151] In this embodiment, the first discharge holes 75 and the second discharge holes 85 are respectively arranged on the side surfaces and inclined surfaces of the partition bending portion 72 and the lid bending portion 82. As another example, the first discharge holes 75 and the second discharge holes 85 can also be respectively arranged on the top surfaces and bottom surfaces of the partition bending portion 72 and the lid bending portion 82.

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

[0153] In this way, in this embodiment, the heating device 100 is arranged below the circulation device C. The air heated by the heating device 100 can (i) rise due to the suction force of the circulation fan 93, and (ii) rise due to natural draft. That is, if the temperature of the air by the heating device 100 increases, the volume expands, the density decreases, and the buoyancy becomes larger, so it rises. A more specific structure related to the circulation of air will be described again below.

[0154] The circulation fan 93 can be combined with the fan motor 91 to form a fan assembly 90. The fan assembly 90 may include a fan motor 91, a circulation fan 93, a rotating shaft 92, and a motor cooling fan 95. At this time, the fan motor 91 and the motor cooling fan 95 may be disposed outside the housing 10. More precisely, the fan motor 91 and the motor cooling fan 95 may be disposed on the back surface of the back panel 20 that constitutes the housing 10. Referring to Figure 5 , it can be seen that the fan motor 91 is disposed on the back panel 20 and exposed rearward.

[0155] As Figure 7 shown, a motor central portion 91a for coupling the rotating shaft 92 may be disposed at the center of the fan motor 91. The fan motor 91 is provided with a fan bracket 91b, and the fan bracket 91b may be fixed to the back panel 20. The motor cooling fan 95 may be coaxially rotated with the circulation fan 93 through the rotating shaft 92. The motor cooling fan 95 may cool the fan motor 91. As another example, the motor cooling fan 95 may also be omitted.

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

[0157] Referring to Figure 9 , in this embodiment, the circulation fan 93 may be disposed in the circulation chamber SA. The circulation fan 93 may be regarded as a part of the circulation device C. Additionally, the entire fan assembly 90 may also be regarded as a part of the circulation device C. As another example, the fan assembly 90 may also be disposed on the side panel 12 or the top panel instead of the back panel 20. As another example, the fan assembly 90 may be omitted.

[0158] Next, observe the heating device 100. The heating device 100 is capable of heating air. The heating device 100 (i) can heat the air flowing in from the outside, and (ii) can heat the air inside the cooking chamber S1. In this embodiment, since the heating device 100 is arranged outside the cooking chamber S1, most of the air flowing in from the outside can be heated. However, if a part of the air inside the cooking chamber S1 flows into the heating device 100, the heating device 100 can also heat the internal air.

[0159] The heating device 100 may be arranged outside the frame 60. In this embodiment, the heating device 100 may be arranged below the bottom surface portion 61 of the frame. Refer to Figure 10 , it may be arranged between the bottom surface portion 61 of the frame and the bottom surface panel 17. More precisely, the heating device 100 may extend in one direction along the rear edge of the lower part of the frame 60.

[0160] Refer to Figure 10 , a setting space IS may be arranged between the bottom surface portion 61 of the frame and the bottom surface panel 17. The heating device 100 may be arranged in the setting space IS. The heating device 100 may be arranged at the rear of the setting space IS, that is, at a position close to the rear panel 20.

[0161] In this way, if the heating device 100 is arranged outside the frame 60, the heating device 100 will not intrude into the cooking chamber S1. Therefore, the space of the cooking chamber S1 will not be narrowed by the heating device 100 and can be formed wider. In particular, in this embodiment, since heating components such as the burner 120 are omitted in the circulation device C, and components such as the heat shield for assisting the heating components are omitted, the rear space of the cooking chamber S1 can be formed wider.

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

[0163] Refer to Figure 10, the burner 120 disposed in the heating device 100 can generate a flame forward, that is, in the direction of the door 50 (arrow ① direction). Here, the direction in which the burner 120 generates a flame can be referred to as the first direction. Moreover, the circulation device C and the heating device 100 can be arranged in a direction different from the first direction, that is, the second direction (arrow ② direction). Thus, the flame generated 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 this embodiment, the first direction and the second direction are formed to be orthogonal to each other. As another example, the first direction can also be a direction inclined upward from the horizontal direction.

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

[0165] At the same time, the air in 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 sucked from the cooking chamber S1. At this time, the temperature of the air sucked from the cooking chamber S1 is relatively low, and the air rising from the heating device 100 has been heated, so the temperature is relatively high. If the two kinds of air are mixed and heat exchange occurs, the mixed air can be formed to be at a higher temperature than the air flowing in from the cooking chamber S1.

[0166] At this time, as described above, 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) by natural draft. Therefore, even if the circulation fan 93 does not operate, the heated air can be supplied to the cooking chamber S1.

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

[0168] On the other hand, if the burner 120 operates to heat the air in the combustion chamber S5, the heating device 100 itself may overheat. Additionally, the frame 60 disposed above the heating device 100 may be deformed due to high heat or the enamel coating of the frame 60 may be damaged. To prevent this, in this embodiment, external air can be used to cool the heating device 100 and the frame 60.

[0169] Referring to Figure 11 , the external air below the heating device 100 is indicated by 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 can perform a cooling function.

[0170] The external air that cools the bottom surface of the heating device 100 while passing along the bottom surface of the heating device 100 can flow into the interior of the heating device 100 (arrow ⑥). More precisely, as shown in the enlarged view of Figure 11 , the external air can flow into the interior of the heating device 100 through a gap, i.e., the second air intake portion IP2, formed between the heating device 100 and the rear panel 20.

[0171] A part of this air is heated by the heating device 100 and moves to the heating chamber S2, but another part can move along the cooling flow paths CP1, CP2 (refer to Figure 18 ) delimited by the flow path guide 130 of the heating device 100. More precisely, a part of the air for cooling moves along the lower part of the burner 120 inside the heating device 100 and then rises through the space CP1 formed by the spacer 111a (refer to Figure 13 ), and during this process, overheating of the bottom surface of the heating device 100, the front surface of the heating device 100, and the lower part of the frame 60 can be prevented (refer to arrow ⑦ in Figure 11 ).

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

[0173] Referring to Figure 12, showing the internal structure of the circulation device C and the heating device 100. The air sucked into the suction hole 84 of the cover plate 80 enters the heating chamber S2 (in the direction of arrow ①), and the heating chamber S2 is filled with the air heated by the heating device 100. Thus, the air in the cooking chamber S1 can be heated as it moves through the suction hole 84 toward the communication hole 74. On the other hand, the motor cooling fan 95 that constitutes the fan assembly 90 can rotate together with the circulation fan 93 and discharge air toward the fan motor 91 (in the direction of arrow ②), thereby being able to cool the fan motor 91.

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

[0175] In the present embodiment, the front-rear length L2 of the heating device 100 is longer than the front-rear length L1 of the lower part of the circulation device C. Here, the front-rear direction refers to the direction from the door 50 toward the back surface portion 65 of the frame. 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 also be regarded as the axial direction of the rotation shaft 92.

[0176] If the front-rear direction length of the heating device 100 is longer, then the lower region of the entire circulation device C can be included within the upper region of the heating device 100. As Figure 12 shown, the entire lower part of the circulation device C can overlap with the upper part of the heating device 100. Thus, the front-rear direction length of the entire circulation device C and the heating device 100 can become the front-rear direction length of the heating device 100, so that the front-rear direction length occupied by the circulation device C and the heating device 100 in the cooking apparatus can be minimized.

[0177] In addition, if the lower part of the circulation device C as a whole overlaps with the upper part of the heating device 100, the 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 becomes shorter, heat loss is reduced, thereby improving the efficiency of the cooking device. In addition, since the discharge chamber S3 overlaps with the combustion chamber S5, the heat of the combustion chamber S5 can be conducted to the discharge chamber S3. The heat conducted in this way heats the air in the discharge chamber S3, thereby improving the thermal efficiency of the cooking device.

[0178] In this embodiment, the upper part of the heating device 100 may overlap with the lower part of the circulation device C and may not overlap with the bottom surface of the cooking chamber S1. In this way, while the heat inside the heating device 100 does not directly heat the bottom surface of the cooking chamber S1, the heat of the heating device 100 can be concentrated on the circulation device C.

[0179] Refer to Figure 11 , based on the extending direction of the flow path connecting the combustion chamber S5 and the heating chamber S2, the burner 120 may be disposed at a position beyond the range overlapping with the heating chamber S2. Here, the extending direction of the flow path refers to the vertical direction, that is, the direction in which the circulation device C and the heating device 100 are stacked. The burner 120 is configured to be biased backward, that is, in the direction of the rear panel 20, based on the extending direction of the flow path, so as not to overlap with the heating chamber S2.

[0180] Based on the extending direction of the flow path connecting the combustion chamber S5 and the heating chamber S2, all or a part of the burner 120 may be disposed at a position overlapping with the discharge chamber S3. As Figure 11 shown, a part of the burner 120 may be configured to overlap with the discharge chamber S3 in the vertical direction.

[0181] In this embodiment, the heating device 100 may protrude more backward, that is, in the direction of the rear panel 20, than the circulation device C. Refer to Figure 11 and Figure 12, although the heating device 100 protrudes to a position very adjacent to the surface of the back panel 20, the circulation device C can be spaced relatively forward (to the left in the figure) from the surface of the back panel 20. The protruding portion of the heating device 100 that protrudes more than the circulation device C, i.e., the extension portion (not labeled in the drawing), can be utilized as an inflow space for allowing external air to flow into the interior of the heating device 100. External air can smoothly flow into the combustion chamber S5 through the upper and lower portions of the extension portion of the heating device 100 that protrudes more than the circulation device C. As will be described below, a portion where the heating device 100 and the back panel 20 face each other can be spaced apart by a predetermined distance to form an inflow path, and external air can flow into the combustion chamber S5 through this portion.

[0182] Refer to Figures 13 to 17 , and observe the heating device 100. The heating device 100 can form a combustion chamber S5 inside, and a burner 120 can be arranged in the combustion chamber S5. The burner 120 generates a flame using gas, thereby being able to heat the air in the combustion chamber S5. The heating device 100 can function to heat the air in the combustion chamber S5 and transfer it to the heating chamber S2.

[0183] At this time, the combustion chamber S5 can form a lower flow path for delivering the air heated by the burner 120 to the upper flow path. The upper flow path can be regarded as an air movement path inside the circulation chamber SA. In this embodiment, the upper flow path and the lower flow path can be connected to each other along the height direction of the frame 60 through a connection channel 61a arranged on the bottom surface portion 61 of the frame.

[0184] The skeleton of the heating device 100 can be formed by a burner housing 110. The burner housing 110 can have a substantially hexahedral structure. The burner housing 110 can be formed of a metal material with high heat resistance. A part of the top surface and the back surface of the burner housing 110 can be open. The open part of the top surface of the burner housing 110 can be blocked by the bottom surface portion 61 of the frame. A cavity opening 118 is formed in the open back surface of the burner housing 110, and the cavity opening 118 can be blocked by the shielding cover 28 described above. This structure will be described again below.

[0185] Observing the structure of the burner housing 110, the burner housing 110 may be configured with a front plate 111 that forms the front of the combustion chamber S5. The burner housing 110 may be configured with side plates 112 that form the sides of the combustion chamber S5. The burner housing 110 may be configured with a top plate 113 that forms the top surface of the combustion chamber S5. The burner housing 110 may be configured with a bottom plate 117 that forms the bottom surface of the combustion chamber S5. The front plate 111, side plates 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 combining a plurality of components by welding or the like or assembling them with fasteners such as screws.

[0186] The front plate 111 may be configured with a spacer portion 111a. The spacer portion 111a may be formed by a part of the front plate 111 protruding into the combustion chamber S5. The cross-section of the front plate 111 may become a concavo-convex structure due to the spacer portion 111a. In the present embodiment, a plurality of spacer portions 111a may be arranged at intervals along the length direction of the front plate 111, that is, the extending direction of the burner 120.

[0187] The spacer portion 111a may be disposed in close contact with the surface of the guide member front portion 131 of the flow path guide member 130 in the combustion chamber S5. A space is provided between the spacer portion 111a and another adjacent spacer portion 111a from the surface of the guide member front portion 131, thereby forming a passage. Such a passage may become 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 outside air flowing into the combustion chamber S5 rises through the cooling flow path CP1, not only the surfaces of the front plate 111 and the flow path guide member 130 are cooled, but also the frame bottom surface portion 61 can be cooled. To distinguish it from the cooling flow path CP2 of another path to be described below, the cooling flow path CP1 is referred to as the first cooling flow path CP1.

[0188] The spacer portion 111a may extend to the upper end of the front plate 111, but is only disposed up to the upper part of the lower end of the front plate 111. Referring to Figure 19 the path shown by the arrow ⑦, a continuous path can be formed from the portion where the front of the bottom plate 117 is connected to the lower part of the front plate 111 where the spacer portion 111a is omitted to the first cooling flow path CP1, and the first cooling flow path CP1 is disposed between the surface of the guide member front portion 131 and the back surface of the front plate 111. External air can pass through such a path. As another example, the spacer portion 111a may also protrude from the guide member front portion 131 toward the front plate 111 instead of protruding from the front plate 111.

[0189] Thus, a part of the cooling flow paths CP1 and CP2 can be formed between the surfaces of the burner housing 110 facing each other and the surface of the flow path guide 130 in the height direction of the combustion chamber S5.

[0190] Referring again to Figure 13 , the side plate 112 can be provided with a bracket hole 112a through which the bracket portion 129 of the burner 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 this embodiment, the burner 120 can be maintained in a state of being fixed by the bracket portion 129 and the burner fixing piece 128 of the burner 120, which will be described below.

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

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

[0193] A top surface opening portion 116 can be provided in a portion of the top plate 113 adjacent to the interference avoidance portion 113a. The top surface opening portion 116 can be formed in a shape where a part of the top plate 113 is open in the vertical direction. The top surface opening portion 116 can be formed to be long in the extending direction of the burner 120. The top surface opening portion 116 can be formed by cutting a part of the top plate 113 and bending it upward.

[0194] 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 above the frame bottom surface portion 61. The 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.

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

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

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

[0198] Thus, the heating device 100 and the circulation device C can be respectively coupled to the frame 60 and supported thereby. The circulation device C and the heating device 100 are respectively fixed to the surface of the frame 60 at different positions from each other. Since the heating device 100 is supported by the frame 60, it does not rely on the circulation device C for installation. Thus, the heating device 100 can be non-directly in contact with the circulation device C. That is, the heating device 100 can be fixed to the frame 60 in a state where the surface of the circulation device C and the surface of the heating device 100 are non-contact with each other. Thus, the amount of radiant heat generated on 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 on the air in the heating combustion chamber S5.

[0199] Referring again to Figure 14 , the back surface of the burner housing 110 may be open to form a cavity opening 118. The cavity opening 118 may be formed in a substantially quadrilateral shape surrounding the edges of the top plate 113, the bottom plate 117, and the side plates 112. The cavity opening 118 may open toward the back panel 20. Although the cavity opening 118 is connected to the panel opening 23 of the back panel 20, it may be covered by the shielding cover 28.

[0200] Referring to Figure 19 , the bottom plate 117 may be provided with uneven portions 117a. In the present embodiment, the uneven portions 117a are disposed below the burner 120. The uneven portions 117a may be formed in a shape in which a part of the bottom plate 117 is bent. The uneven portions 117a increase the hardness of the bottom plate 117, thereby preventing the bottom plate 117 from deforming due to the high temperature of the combustion chamber S5.

[0201] The uneven portions 117a may increase the contact area with the external air passing through the lower part of the burner housing 110. The external air passing through the outside of the burner housing 110 may come into contact with the uneven portions 117a for heat exchange, and in this process, the bottom plate 117 and the burner housing 110 may be cooled. The external air naturally flows into the relatively low-pressure combustion chamber S5, and may pass through the bottom plate 117 during this process.

[0202] An air inlet passage SP may be formed on the lower side of the bottom plate 117. The air inlet passage SP may 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 inlet passage SP is an empty space and may also be regarded as a part of the installation space IS. The air inlet passage SP may serve as a path for guiding external air to the inside of the heating device 100.

[0203] Figure 19 Arrow ④ in the figure shows the direction of the air flow that cools the exterior of the cooling base plate 117 through the uneven portion 117a. The air on the exterior can contact the base plate 117 through the air inflow passage SP. Thus, the air that has cooled the base plate 117 can continue to move along the air inflow passage SP and enter the combustion chamber S5 through the gap between the burner housing 110 and the rear panel 20, i.e., the second air intake portion IP2. This structure will be described again below.

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

[0205] Next, Figure 15 the burner 120 that constitutes the heating device 100 will be described. For reference, Figure 15 the figure shows a form in which a flame guide member 140 to be described later is incorporated in the burner 120. From this, it can be seen that the burner 120 can be a linear tube structure that extends in one direction along the rear edge of the lower part of the frame 60. The burner body 121 that forms the framework of the burner 120 can be in the form of a bar that extends in one direction. The burner body 121 may extend in the length direction of the burner housing 110. The fuel gas flow path 121a to which the mixed fuel gas is supplied may extend in the front-rear direction inside the burner body 121.

[0206] The burner 120 may be disposed at a position separated from the heating flow path GP. The heating flow path GP is a movement path of air formed by a flow path guide member 130 to be described later and can be regarded as a passage connecting the combustion chamber S5 and the heating chamber S2. If the burner 120 is disposed at a position separated from the heating flow path GP, the distance from the burner 120 to the heating flow path GP is ensured, and a space where the air to be heated by the flame may exist can be sufficiently formed. For this purpose, the burner 120 may generate a flame in the direction of the heating flow path GP.

[0207] Referring to Figure 6 , the burner 120 is connected to an ignition spark plug 122. The ignition spark plug 122 can ignite the mixed fuel gas. The ignition spark plug 122 may be provided with a connector 122a connected to a power source (refer to Figure 13)。The connector 122a can be coupled to a power supply component inside the housing 10.

[0208] A mixing tube 123 can be disposed on one side of the burner body 121. The mixing tube 123 can mix air supplied from the outside and fuel gas supplied from the nozzle holder 127. When the burner 120 operates, fuel gas is supplied from the nozzle holder 127 to one end of the burner 120. At this time, a low pressure is formed due to the structure in which the width of the mixing tube 123 becomes narrower, and the surrounding air can be naturally supplied to the mixing tube 123 side due to the pressure difference. Moreover, the fuel gas is burned due to the ignition spark plug 122, and thus a flame can be generated in the flame hole 125.

[0209] Refer to Figure 21 , a tube air hole 124 can be formed in the lower portion of the mixing tube 123. The tube air hole 124 can be opened toward the bottom plate 117. The tube air hole 124 is connected to a holder air hole 127a' of the nozzle holder 127 coupled to the mixing tube 123. Accordingly, outside air can flow into the fuel gas flow path 121a of the burner body 121 through the holder air hole 127a' and the tube air hole 124. As a reference, a combustion air hole 119 can be formed in the bottom plate 117 at a position opposite to the tube air hole 124. Outside air, more precisely, outside 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 part IP1 which will be described below.

[0210] More specifically, when fuel gas is supplied to the inside of the burner body 121, a part of the air required for combustion (hereinafter referred to as "primary air") flows in together and is mixed with the fuel gas, and the mixed fuel gas of the fuel gas and air can be burned in the flame hole 125. Moreover, new air (referred to as "secondary air") flows into the flame side again around the flame that has completed combustion, and thus complete combustion is achieved. Thus, only by supplying a sufficient amount of secondary air during the combustion process can complete combustion be achieved, and thereby the thermal efficiency of the burner 120 can be improved. The supply structure of this secondary air will be described again below.

[0211] As Figure 15As shown, the flame holes 125 can be formed through the burner body 121. The flame holes 125 form a passage for the mixed gas inside the burner body 121 to be discharged to the outside of the burner body 121. A plurality of flame holes 125 can be arranged at the side of the burner body 121 at predetermined intervals along the length direction of the burner body 121. Thus, a plurality of gas discharge channels can be provided along the length direction of the burner body 121. The reference numeral 126 denotes auxiliary flame holes arranged in the front part of the flame holes 125 for flame transmission.

[0212] In this embodiment, the flame holes 125 are only arranged on the front surface of the burner body 121. Here, the front surface 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, bottom surface or back surface of the burner 120, but only on the front-facing surface. The flame holes 125 can be regarded as being opposite to the flow path guide member 130.

[0213] The flame holes 125 can open towards the lower flow path. The lower flow path is a path for air flow inside the combustion chamber S5. In this embodiment, at least a part of the lower flow path can be formed by the flow path guide member 130. If the flame holes 125 open towards the lower flow path, the flame generated at the flame holes 125 will not heat the surface of the burner housing 110, but can concentrate on heating the air in the combustion chamber S5. Therefore, the burner 120 can effectively heat the air in the combustion chamber S5 and can also prevent the burner housing 110 from being overheated by radiant heat. In addition, in other words, it can be regarded that the direction in which the flame holes 125 of the burner 120 open is parallel to the direction of the rotation axis 92 of the circulation fan 93. As another way, it can also be regarded that the flame holes 125 of the burner 120 open towards the flow path connecting the circulation chamber SA and the combustion chamber S5.

[0214] The flame holes 125 can form a plurality of heat sources. The flame holes 125 can be arranged along the length direction 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 this embodiment, a total of three flame hole matrices with different angles from each other in the circumferential direction are arranged in the burner 120. The three flame hole matrices can be combined with each other by flames to provide stronger firepower.

[0215] One side of the burner body 121 may be provided with a nozzle holder 127. The nozzle holder 127 may transfer the gas supplied from the outside to the burner body 121. To this end, the nozzle holder 127 may be connected to a nozzle (not shown) of an external gas pipe (not shown). The nozzle holder 127 transfers the gas supplied from the gas pipe to the gas flow path 121a, and air and gas may be mixed with each other during this process.

[0216] Referring to Figure 21 , the holder body 127a of the nozzle holder 127 may be coupled to surround one end of the burner body 121. A holder air hole 127a' may be formed in the lower portion of the holder body 127a. The holder air hole 127a' may be connected to a pipe air hole 124 disposed in the mixing pipe 123. The holder air hole 127a' and the pipe air hole 124 may be connected to each other to form an air intake passage. The air intake passage may be a path for supplying primary air.

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

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

[0219] The nozzle holder 127 may be provided with 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 direction different from that of the holder air hole 127a'. More precisely, the gas inlet hole 127b may face the panel opening 23 of the back panel 20. Thus, the gas inlet hole 127b may be exposed to the outside through the panel opening 23. Figure 21 Arrow ④ in Figure 21 indicates the path along which the external gas is supplied in the direction of the gas inlet hole 127b.

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

[0221] Next, observe the flow path guide 130 constituting the heating device 100. Referring to the exploded view, i.e., Figure 7 Figure 7 , the flow path guide 130 may have a substantially hexahedral shape. Since the flow path guide 130 is housed in 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 separately formed from the burner housing 110 and then disposed in the combustion chamber S5. As another example, the flow path guide 130 may also be integrally formed with the burner housing 110.

[0222] The flow path guide 130 may form a plurality of flow paths together with the burner housing 110. The flow path guide 130 may divide the combustion chamber S5 into a plurality of spaces to generate airflows toward the divided spaces respectively. Here, division means that even if there is no complete partition between two spaces, air will flow separately toward each space. As will be described later, the flow path guide 130 may divide the connection passage 61a' into a heating air outlet portion 134 and cooling air outlet portions OP1, OP2.

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

[0224] In this way, the flow path guide 130 can form the partitioned heating flow path GP and cooling flow paths CP1, CP2 inside the combustion chamber S5. The heating flow path GP can be a path through which the air heated by the burner 120 flows. The cooling flow paths CP1, CP2 are paths that flow around the periphery of the burner 120 and can be paths through which relatively low-temperature air compared to the air passing through the heating flow path GP flows.

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

[0226] The high-temperature air in the combustion chamber S5 heated by the burner 120 can be transferred to the circulation chamber SA. More precisely, the flow path guide 130 can be connected to the heating chamber S2 in the circulation chamber SA and can transfer the 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 the upper flow path formed by the heating chamber S2. The lower flow path can also be regarded as the heating flow path GP arranged inside the flow path guide 130.

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

[0228] Refer toFigure 13 and Figure 14 The flow path guide 130 can be inserted through the top surface opening 116 of the burner housing 110. The burner housing 110 can form a movement path of air that is disposed at the top surface opening 116 and moves upward by using the top surface opening 116. The flow path guide 130 can have a substantially hexahedral shape. The flow path guide 130 can be coupled to the burner housing 110.

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

[0230] The guide top surface portion 133 can be provided with a heating air outlet portion 134. The heating air outlet portion 134 can be formed in the guide top surface portion 133 in the vertical direction. The heating air outlet portion 134 can connect the heating flow path GP formed inside the flow path guide 130 to the heating chamber S2. A plurality of the heating air outlet portions 134 can be arranged in the left - right direction of the flow path guide 130. As another example, the heating air outlet portion 134 can also be in the form of a single elongated hole that is continuous with each other.

[0231] The guide front surface portion 131 can be in close contact with the front plate 111 of the burner housing 110. More precisely, the guide front surface portion 131 can be in close contact with the spacer portion 111a of the front plate 111. The guide front surface portion 131 can be coupled or welded to the spacer portion 111a by using a fastener such as a screw (not shown). In this embodiment, the flow path guide 130 is only coupled to the spacer portion 111a, and the remaining parts are not coupled to the burner housing 110.

[0232] Refer to Figures 18 to 20, the width of the upper end of the flow path guide 130 can be narrower than the width of the connecting channel 61a. Thus, the outer surface of the flow path guide 130 and the inner surface of the connecting channel 61a can be separated from each other. In this way, cooling air outlets OP1 and OP2 can be formed between the separated flow path guide 130 and the connecting channel 61a. The cooling air outlets OP1 and OP2 can be continuously formed around the upper end surface of the flow path guide 130. As another example, the cooling air outlets OP1 and OP2 can be divided into a flow path CP1 outlet OP1 formed between the guide front portion 131 of the flow path guide 130 and the connecting channel 61a, and a flow path CP2 outlet OP2 formed between the guide back portion 135 and the connecting channel 61a, and they may also be disconnected from each other.

[0233] The cooling flow paths CP1 and CP2 may be formed around the periphery of the flow path guide 130. At least a portion of the cooling flow paths CP1 and CP2 may be formed along a space surrounding the flow path guide 130. In this way, the first cooling flow path CP1 and the second cooling flow path CP2 may perform a heat insulation function around the heating flow path GP. The cooling flow paths CP1 and CP2 may be arranged outside the flow path guide 130 and inside the heating shell 110.

[0234] In this way, the flow path 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 and transferring the heated air to the heating chamber S2 and (ii) the cooling flow paths CP1 and CP2 formed around the heating flow path GP and 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 and CP2 can form a double flow path.

[0235] The cooling channels CP1 and CP2 may include a first cooling channel CP1 and a second cooling channel CP2. The first cooling channel CP1 and the second cooling channel CP2 may be respectively arranged on the outside of the channel guide 130. The first cooling channel CP1 and the second cooling channel CP2 are arranged on opposite sides of each other across the heating channel GP, so that different air movement paths can be formed. The first cooling channel CP1 and the second cooling channel CP2 are the same in the following aspects: (i) connecting the combustion chamber S5 and the heating chamber S2, and (ii) forming a path partitioned from the heating channel GP to allow relatively low temperature air to pass through.

[0236] The first cooling flow path CP1 and the second cooling flow path CP2 may surround the upper end of the flow path guide 130. Thus, the heating flow path GP disposed inside the flow path guide 130 may become a path for air heated to a high temperature to move, but the second cooling flow path CP2 surrounding the heating flow path GP may form a cooling channel for relatively low temperature air to pass through. Since the cooling channel surrounds the heating flow path GP, a heat insulating layer may be formed.

[0237] Reference Figure 18 , it can be seen that the upper end of the flow path guide 130 protrudes into the interior of the heating chamber S2. In this embodiment, a portion of the flow path guide 130 enters the inner side of the heating chamber S2 through the connecting channel 61a. The heating air outlet 134 of the heating flow path GP may also be located inside the heating chamber S2. Thus, the heated air passing through the heating flow path GP will not leak to the outside of the flow path guide 130, but can be accurately delivered to the interior of the heating chamber S2. In this way, the portion of the flow path guide 130 that protrudes into the heating chamber S2 may be referred to as a protruding portion (not given a reference numeral).

[0238] If a part of the flow path guide 130, i.e., the protrusion, enters the inner side of the heating chamber S2 through the connecting passage 61a, the outlet of the heating flow path GP, i.e., the heating air outlet 134, and the outlets of the cooling flow paths CP1 and CP2, i.e., the cooling air outlets OP1 and OP2, have a height difference with each other. More precisely, the heating air outlet 134 can be formed to be higher than the cooling air outlets OP1 and OP2. In this way, the high-temperature air discharged from the heating air outlet 134 and the relatively low-temperature air discharged from the cooling air outlets OP1 and OP2 can not be mixed in the connecting passage 61a. Therefore, the high-temperature air passing through the heating flow path GP can effectively heat the air in the heating chamber S3, and the low-temperature air passing through the cooling flow paths CP1 and CP2 can cool the peripheral parts of the connecting passage 61a. In particular, it is possible to prevent the lower part of the frame 60 constituting the periphery of the connecting passage 61a from being deformed by high heat or the enamel coating of the frame 60 from being damaged.

[0239] Reference Figure 13, if the front surface 131 of the guide member abuts against the spacer portion 111a, an empty space extending in the vertical direction may be formed between the front plate 111, the spacer portion 111a, and the surface of the front surface 131 of the guide member. The empty space may form a first cooling flow path CP1. If the air at the bottom side of the combustion chamber S5, which is not heated by the burner 120 or is less affected by the burner 120, in the external air rises through the first cooling flow path CP1, the first cooling flow path CP1 can not only cool the surfaces of the front plate 111 and the front surface 131 of the guide member, but also cool the bottom surface portion 61 of the frame. As a reference, the path formed along the bottom plate 117, which is the lower part of the burner 120, may also be regarded as a part of the first cooling flow path CP1.

[0240] Referring to the top view Figure 16 , it can be seen that the first cooling flow path CP1 is formed between the two spacer portions 111a. The first cooling flow path CP1 can form a continuous path between the spacer portions 111a. The lower end of the first cooling flow path CP1 may be open toward the bottom plate 117 of the burner housing 110.

[0241] Referring to Figure 18 , the upper end of the first cooling flow path CP1 may be open toward the combustion chamber S5 between the upper part of the flow path guide member 130 and the connection passage 61a penetrating the bottom surface portion 61 of the frame. More precisely, in a state where the upper end portion of the flow path guide member 130 is disposed in the connection passage 61a, a first cooling air outlet portion OP1 is formed between the outer surface of the flow path guide member 130 and the inner surface of the connection passage 61a. In other words, it can be regarded that the first cooling air outlet portion OP1 is formed around the upper end portion of the flow path guide member 130.

[0242] Referring to Figure 19 , the second cooling flow path CP2 formed by the flow path guide member 130 is shown. The second cooling flow path CP2 may be disposed above the burner 120. The second cooling flow path CP2 may be formed between the flow path guide member 130 and the bottom surface portion 61 of the frame. Thus, the second cooling flow path CP2 may be disposed along the upper part of the combustion chamber S5.

[0243] The second cooling flow path CP2 may be a flow path through which a part of the air flowing into the combustion chamber S5 from the outside and 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 member 130 and the bottom surface portion 61 of the frame. Figure 19The arrow ⑨ therein indicates the flow direction of the air moving along the second cooling flow path CP2. As described later, the outlet of the second cooling flow path CP2, i.e., the second cooling air outlet part OP2, can be connected through the back surface part 135 of the guide member and the flow path inlet end 65a of the frame bottom surface part 61.

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

[0245] The outlets of the cooling flow paths CP1 and CP2, i.e., the first cooling air outlet part OP1 and the second cooling air outlet part OP2, can be formed between the upper edge of the flow path guide member 130 and the connection passage 61a disposed on the frame bottom surface part 61. The first cooling air outlet part OP1 and the second cooling air outlet part OP2 can be structured to surround the heating air outlet part 134 of the heating flow path GP. Thus, the first cooling air outlet part OP1 and the second cooling air outlet part OP2 can perform a heat insulation function around the heating air outlet part 134 of the heating flow path GP. For reference, based on the circulation device C, the inlets of the first cooling air outlet part OP1, the second cooling air outlet part OP2, and the heating air outlet part 134 of the heating flow path GP can respectively be intake parts.

[0246] The first cooling flow path CP1 and the second cooling flow path CP2 can be partitioned from the heating flow path GP respectively, 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 outlet parts OP1 and OP2. The first cooling air outlet part OP1 can be formed between the front surface part 131 of the guide member and the connection passage 61a, and the second cooling air outlet part OP2 can be formed between the back surface part 135 of the guide member and the connection passage 61a. The first cooling air outlet part OP1 and the second cooling air outlet part OP2 can be connected to each other between the side surface parts 132 of the guide member constituting the cooling air outlet parts OP1 and OP2 and the connection passage 61a. Thus, the first cooling air outlet part OP1 and the second cooling air outlet part OP2 are connected to each other and can form a substantially quadrilateral shape.

[0247] The first cooling air outlet part OP1 and the second cooling air outlet part 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 in a quadrilateral shape, the overall continuous cooling air outlet parts OP1 and OP2 formed by the first cooling air outlet part OP1 and the second cooling air outlet part OP2 can be a channel structure in a quadrilateral shape. That is, based on the planar structure, the heating air outlet part 134, which can be in a quadrilateral shape, is surrounded by the larger quadrilateral-shaped cooling air outlet parts OP1 and OP2.

[0248] On the other hand, observing the back surface part 135 of the guide, the back surface part 135 of the guide can be formed such that the length in the vertical direction is shorter than that of the front surface part 131 of the guide. Thereby, the back surface part 135 of the guide can be spaced apart from the bottom plate 117 toward the upper part by a longer distance than the front surface part 131 of the guide. That is, compared with the lower end of the front surface part 131 of the guide, the lower end of the back surface part 135 of the guide is spaced apart from the bottom of the combustion chamber S5 toward the upper part by more, so that the inlet of the heating flow path GP can be opened toward the burner 120. The flame F of the burner 120 can be led to the inside of the heating flow path GP through the inlet of the heating flow path GP. Therefore, it can be regarded that the inlet of the heating flow path GP is formed between the lower end of the back surface part 135 of the guide and the bottom plate 117.

[0249] A part of the back surface part 135 of the guide can be bent to form a back surface bent part 135a. The back surface bent part 135a can extend along the direction of the back surface panel 20, more precisely, along the direction parallel to the direction in which the flame holes 125 are opened. Refer to Figure 19 , the back surface bent part 135a can narrow the distance between the guide end part 145a of a flame guide 140, which will be described below, and the flow path guide 130. A first separation part G1 separated by a predetermined distance can be formed between the back surface bent part 135a and the guide end part 145a. Thus, secondary air can flow into the separated first separation part G1. That is, the first separation part G1 can be connected to the inlet of the heating flow path GP. If a part of the air introduced from the outside flows into the first separation part G1 between the back surface bent part 135a and the guide end part 145a, it can become secondary air supplied to the burner 120. Such secondary air is supplied to the flame F generated in the flame holes 125 of the burner 120 and contributes to complete combustion.

[0250] On the other hand, the flow path guide 130 may be configured with a guide fence 137. The guide fence 137 may be disposed at the lower end of the front portion 131 of the guide. The guide fence 137 may protrude in a direction inclined from the vertical direction toward the burner 120. The guide fence 137 may guide the air heated by the burner 120 toward the heating flow path GP. The guide fence 137 may cause the air heated by the flame F of the burner 120 not to flow toward the first cooling flow path CP1, but to move along the heating flow path GP toward the heating chamber S2.

[0251] Referring Figure 18 , the lower end of the guide fence 137 may be disposed at a position lower than the flame holes 125. The reference numeral H1 represents an imaginary horizontal line passing through the lowermost flame hole 125 among the flame holes 125 of the burner 120. It can be seen that the flame holes 125 of the burner 120 are located at a position higher than the lower end of the guide fence 137. Thus, if the flame F generated at the flame holes 125 heats the air, the heated air can be guided upward from the lower end of the guide fence 137. Additionally, when the flame F is formed to be relatively long in the front-rear direction, the guide fence 137 can also prevent the flame F from flowing toward the first cooling flow path CP1.

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

[0253] In the present embodiment, the flame guide 140 may be disposed 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 is blocked by the flame guide 140 and cannot extend further upward, but instead flows along the flame guide 140 toward the heating flow path GP. Therefore, the burner 120 can intensively heat the air rising through the heating flow path GP.

[0254] The flame guide 140 may be formed of a material with high heat resistance. The flame guide 140 may be formed of a plate-like material. The flame guide 140 may be formed to be relatively long in the longitudinal direction of the burner 120. The flame guide 140 may have a length capable of covering the entire area where the flame holes 125 are arranged.

[0255] In this embodiment, the flame guide 140 may include a fixed body 141 and guide vanes 145. The fixed body 141 and the guide vanes 145 may be a plate-like structure connected to each other. The fixed body 141 may be coupled to the burner 120. The fixed body 141 may be coupled to the surface of the burner 120. To this end, the fixed body 141 may have a curved surface corresponding to the surface of the burner 120. Referring to Figure 13 , the fixed body 141 may 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 as a part thereof may be coupled to the burner 120, and the guide vanes 145 may extend from the fixed body 141 toward the flow path guide 130. More precisely, a guide end portion 145a disposed at an end of the guide vanes 145 may extend in a direction inclined upward toward the connection passage 61a.

[0256] Refer to Figure 19 , with the guide vanes 145 as a reference, the flame F may extend below the guide vanes 145. A part of the heating flow path GP for guiding the heated air may be formed between the lower part of the flame guide 140 and the bottom surface of the burner housing 110. An empty space is formed between the lower part of the guide vanes 145 and the bottom plate 117 with a gap therebetween, and the empty space may form a part of the heating flow path GP. The lower part of the guide vanes 145 may also be regarded as forming a flame space for the flame F.

[0257] Air introduced from the outside may move above the guide vanes 145. An outside air space S6 capable of flowing in secondary air introduced from the outside may be formed between the upper part of the guide vanes 145 and the top plate 113. The outside air space S6 may constitute the second cooling flow path CP2. The air passing through the outside air space S6 may be transferred to the lower part of the frame 60 while cooling the peripheral part through the cooling air outlet OP2.

[0258] Part of the secondary air passing through the outside air space S6 may also enter the heating flow path GP through a first separation part G1 between the guide end portion 145a and the back bending portion 135a, thereby contributing to the complete combustion of the burner 120. A part of the secondary air entering the outside air space S6 may move toward the first separation part G1 between the guide end portion 145a and the back bending portion 135a, and thus converge into the heating flow path GP.

[0259] More specifically, the outside air space S6 may be formed between the flame guide member 140 and the back surface portion 65 of the frame that covers the top surface opening portion 116 of the burner housing 110. Based on the back surface bending portion 135a, the outside air (i) flowing into the outside air space S6 may enter the outlet of the second cooling flow path CP2, i.e., the second cooling air outlet portion OP2 (in the direction of arrow ⑨) through the second separating portion G2 formed in the upper portion of the back surface bending portion 135a, or (ii) may converge at the inlet of the heating flow path GP through the first separating portion G1 formed between the back surface bending portion 135a and the guide member end portion 145a. The air converging at the inlet of the heating flow path GP may be transferred to the flame formed in the burner 120 and become secondary air that contributes to complete combustion.

[0260] Among them, the outside air space S6 may constitute a part of the second cooling flow path CP2. The air passing through the second cooling flow path CP2 may be transferred to the lower portion of the frame 60 through the second cooling air outlet portion OP2, thereby performing a cooling function.

[0261] Observing the structures of the back surface bending portion 135a and the guide member end portion 145a, since the end portion of the back surface bending portion 135a protrudes toward the back surface panel 20 more than the guide member end portion 145a, the secondary air can be guided toward the inlet direction of the heating flow path GP. At this time, the back surface bending portion 135a may be disposed between the guide member end portion 145a and the flow path inlet end 65a. Based on the back surface bending portion 135a, the converging portion (the first separating portion G1) of the heating flow path GP formed between the back surface bending portion 135a and the guide member end portion 145a and the connecting portion G2 of the second cooling air outlet OP2 formed between the back surface bending portion 135a and the flow path inlet end 65a may be partitioned. Among them, the connecting portion G2 between the back surface bending portion 135a and the flow path inlet end 65a, i.e., the second separating portion G2, may be connected to the second cooling air outlet portion OP2. In this embodiment, the second separating portion G2 has a position higher than that of the burner 120.

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

[0263] Due to the upwardly inclined structure of the guide vane 145, the outside air space S6 may be an empty space whose width gradually narrows toward the guide end portion 145a. Thus, the air can have a faster speed as it approaches the guide end portion 145a. The air with an increased speed can be smoothly delivered to the second cooling flow path CP2 or the first separation portion G1.

[0264] The outside air space S6 may be a kind of heat insulation 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 precisely, the amount of heat transferred to the portion where the bottom surface portion 61 of the frame and the back surface portion 65 of the frame are connected. Thereby, the durability of the frame 60 can be improved.

[0265] The air outside the outside air space S6 can cool the flame guide 140 when passing through the flame guide 140. The outside air space S6 is in surface contact with the surface of the flame guide 140 and performs heat exchange, thereby reducing the temperature of the flame guide 140 and preventing overheating of the flame guide 140. Figure 19 Arrow ⑧ in the figure indicates the flow direction of the air moving along the surface of the burner 120. The air moving in this way can cool the flame guide 140 when passing through the flame guide 140. Moreover, the air continuing to move along the path of the second cooling flow path CP2, which is the outside air space S6, can converge at the outlet OP2 of the second cooling flow path CP2, or can converge at the heating flow path GP through the first separation portion G1.

[0266] At this time, the air converging at the heating flow path GP through the first separation portion G1 can be in a state of being primarily heated through heat exchange during the process of cooling the flame guide 140 when passing through the flame guide 140. Thereby, the heat loss generated by the secondary air supplied from the outside can be minimized.

[0267] On the other hand, the end of the guide vane 145, i.e., the guide member end portion 145a, may only extend to a range that does not infringe on the heating flow path GP. Refer to Figure 18 , it can be seen that the guide member end portion 145a only extends from the back surface portion 135 of the guide member to a position that retreats in the direction of the burner 120. Based on an imaginary line extending in the vertical direction along which the back surface portion 135 of the guide member is arranged, the guide member end portion 145a is arranged in an area that does not exceed the imaginary line. In this way, the guide member end portion 145a can not infringe on the heating flow path GP and does not hinder the flow of air through the heating flow path GP.

[0268] Next, refer to Figure 19 to describe the process in which the outside air is heated by the heating device 100 and then supplied to the circulation device C. First, if the ignition spark plug 122 is ignited after the mixed gas of air and gas is supplied to the burner 120, a flame can be generated at the flame holes 125 of the burner 120. Arrow ① indicates the moving direction of the mixed gas, and arrow ② indicates the direction in which the flame is generated through the flame holes 125.

[0269] At this time, the outside air flowing in for the combustion of the mixed gas in the burner 120 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 intake portions 23, 119 (refer to Figure 21 ). At the same time, if the gas supplied from the outside is sprayed using a nozzle, the gas sprayed using the nozzle and the primary air flow into the inside of the mixing tube 123 together. In this way, the gas and air flowing into the inside of the mixing tube 123 are mixed while flowing from the inside of the mixing tube 123 toward the burner body 121 side to generate a mixed gas.

[0270] On the other hand, secondary air is required for the complete combustion of the mixed gas, and the secondary air can be supplied through a path different from that of the primary air. Refer to the enlarged view of Figure 11 , a second intake portion IP2 can be arranged between the heating device 100 and the back panel 20. The second intake portion IP2 can be a predetermined space formed by separating the heating device 100 and the back panel 20.

[0271] Refer to Figure 19 and Figure 20Looking more specifically, the second intake part IP2 can be formed at a portion where the surfaces of the burner housing 110 and the rear panel 20 are spaced apart from each other. The second intake part IP2 can be disposed between the end part of the bottom plate 117 constituting the burner housing 110 and the rear panel 20. Thus, the second intake part IP2 can be configured to be closer to the outer housing 10 than the connection passage 61a, that is, closer to the rear panel 20.

[0272] The second intake part IP2 can be disposed along the surface of the outer housing 10. The outside air moves along the surface of the outer housing 10, so that it can be naturally guided to the second intake part IP2. In the present embodiment, the second intake part IP2 is disposed along the surface of the rear panel 20 in the outer housing 10. In particular, the second intake part IP2 can be disposed in a direction parallel to the surface of the rear panel 20.

[0273] Refer to Figure 20 , the end part of the bottom plate 117 facing the surface of the rear panel 20 is spaced apart from the rear panel 20, and a second intake part IP2 is formed therebetween. In the present embodiment, the rear panel 20 is provided with the panel opening 23, and the shielding cover 28 can cover the panel opening 23. Thus, the second intake part IP2 can also be formed between the bottom plate 117 and the shielding cover 28.

[0274] The second intake part IP2 can also be disposed between the end part of the top plate 113 and the rear panel 20. The end part of the top plate 113 is also spaced apart from the surface of the rear panel 20, and a gap is formed therebetween, and the gap can become the second intake part IP2. Thus, the outside air serving as secondary air can flow in simultaneously through two second intake parts IP2 having different heights from each other.

[0275] If the heat insulation space S4 is filled with a heat insulation material, the passage through which air can flow may be narrowed due to the upper part of the top plate 113 being filled with the heat insulation material. Thus, the lower part of the heat insulation space S4 can also omit the heat insulation material and become a predetermined space for the second intake part IP2.

[0276] In the present embodiment, the second intake part IP2 can be formed in the direction in which the burner 120 is installed, that is, in a direction parallel to the longitudinal direction of the burner 120. Since the outside air flowing in through the second intake part IP2 is used as secondary air for the combustion of the burner 120, it is necessary to uniformly supply it to the entire flame holes 125 of the burner 120. For this purpose, the second intake part IP2 can extend in the longitudinal direction of the burner 120. The second intake part IP2 can be in the same left - right direction as the burner 120 (Figure 1 configured in the Y-axis direction of

[0277] On the other hand, a cavity opening 118 is formed on the burner housing 110, and the second intake part IP2 can be connected to the cavity opening 118. Since the cavity opening 118 is an open part along the rear of the burner housing 110, the second intake part IP2 is connected to the cavity opening 118. Thus, the outside air flowing into the second intake part IP2 can move toward the burner 120 through the cavity opening 118. Of course, as Figure 22 shown, since the cavity opening 118 is blocked by the rear panel 20 or the shielding cover 28, the inflowing air will not leak backward and can flow toward the burner 120.

[0278] Referring to Figure 23 , a magnified form of the second intake part IP2 is shown. It can be seen therefrom that the second intake part IP2 can be formed in the gap between the bottom plate 117 and the shielding cover 28. It can be seen therefrom that the second intake part IP2 can be arranged at the rear of the burner housing 110 closer to the rear panel 20 than the front plate 111 of the burner housing 110. In this way, the outside air can first pass through the air inflow channel SP to cool the bottom plate 117 and the uneven part 117a, and then enter the second intake part IP2.

[0279] More precisely, the outside air flowing in the installation space IS can flow into the heating device 100 through the second intake part IP2 at the end position of the air inflow channel SP blocked by the housing 10. In this embodiment, the end position is formed in the part of the housing 10 blocked by the rear panel 20. Thus, since the outside air first flows along the air inflow channel SP through the surface of the heating device 100 and then flows into the second intake part IP2, the cooling function of the outside air can be effectively completed.

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

[0281] The second intake part IP2 can be arranged closer to the housing 10 than the connection channel 61a. Thus, the air flowing into the second intake part IP2 can enter the second cooling outlet part OP2 after passing through the second heating flow path CP2 serving as the combustion space S5 sufficiently. In this embodiment, the second intake part IP2 is arranged closer to the rear panel 20 than the connection channel 61a.

[0282] Thus, if secondary air flows in through the second intake part IP2, the burner 120 can completely burn the mixed fuel gas. In this embodiment, since the heating device 100 is arranged in a space separated from the circulation fan 93 and independent, although it cannot directly receive secondary air by means of the circulation fan 93, it can receive secondary air through the secondary air supply structure as described above. That is, the heating device 100 can suck in external air and utilize it as secondary air even without additional components such as an additional motor and fan. As another example, the heating device 100 may also be configured with an additional flow path and fan for the inflow of secondary air.

[0283] In particular, in this embodiment, if the air heated in the combustion chamber S5 moves towards the heating chamber S2 by natural ventilation force or the 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, the pressure in the installation space IS, the external air existing in the installation space IS can naturally flow into the interior of the combustion chamber S5 through the second intake part IP2. Thus, if external air flows into the combustion chamber S5 due to the negative pressure in the combustion chamber S5, a part of it is utilized as secondary air, and the remaining part can be used for cooling components such as the lower part of the frame 60.

[0284] Refer to again Figure 19 , it can be seen the flow of the air supplied from the outside and utilized as secondary air. The air that cools the bottom plate 117 and the concave-convex part 117a through the air inflow passage SP (in the direction of arrow ④) can flow into the combustion chamber S5 through the second intake part IP2 (in the direction of arrow ⑤).

[0285] Thus, a part of the external air flowing into the combustion chamber S5 is supplied to the flame holes 125 of the burner 120 after moving along the bottom plate 117 and passing under the burner 120 (in the direction of arrow ⑥), and is utilized as secondary air. The secondary air helps the complete combustion of the mixed fuel gas at the flame holes 125.

[0286] Figure 19 In, arrow ③ indicates the flow of the heated air. The secondary air described above completes complete combustion at the flame holes 125 to generate a flame. If the air in the combustion chamber S5 is heated by the flame, it moves through the heating flow path GP. The heated air can be transferred to the heating chamber S2 through the heating flow path GP.

[0287] Refer to Figure 11, the high-temperature air (in the direction of arrow ②) delivered to the heating chamber S2 can be mixed by the circulation fan 93 with the air (in the direction of arrow ①) inhaled into the cooking chamber S1 of the heating chamber S2. Thus, after the mixed air moves to the discharge chamber S3, it can be supplied to the cooking chamber S1 again through the discharge holes 75 and 85 (in the direction of arrow ③). Figure 11 Arrow ④ in it indicates the direction in which the external air moves to the lower part of the heating device 100, and arrow ⑤ and arrow ⑥ respectively indicate the airflows flowing in the first cooling flow path CP1 and the second cooling flow path CP2.

[0288] Thus, in this embodiment, the heating device 100 is arranged below the circulation device C that circulates the air in the cooking chamber S1 and is arranged in a space independent of the circulation device C. With this structure, even when the circulation fan 93 is driven, the flame of the burner 120 can be unaffected by the fan. Therefore, there is no need for an additional flame stabilization device (stabilizer), and the heat shield plate for protecting the inner wall of the cooking chamber S1 from the flame is also omitted.

[0289] In particular, in the present invention, the air heated in the heating device 100 expands in volume and decreases in density during the heating process, and the buoyancy becomes larger, so that it can rise by natural draft. A more specific structure related to the air circulation will be described again below. Therefore, even when the circulation fan 93 is not working, the heated air can be supplied to the cooking chamber S1.

[0290] On the other hand, a part of the air moving along the first cooling flow path CP1 of the bottom plate 117 can move in the direction of the front plate 111 and flow into the space between the front plate 111 and the front surface portion 131 of the guide member. Then, this air can enter the first cooling flow path CP1 formed between the front plate 111 and the front surface portion 131 of the guide member through the spacer portion 111a (in the direction of arrow ⑦).

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

[0292] The thus - mixed air 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 flame guide 140 along the second cooling flow path CP2 can enter the second cooling air outlet part OP2 (in the direction of arrow ⑨). The air transmitted between the guide end part 145a of the flame guide 140 and the flow path inlet end 65a towards the second cooling air outlet part OP2 can rise while cooling the bottom surface part 61 of the frame and the lower part of the circulation device C.

[0293] Figure 24 and Figure 25 The rear - lower structure of the oven part constituting the second embodiment of the present invention is shown in. If parts different from the previously described embodiment are described, a cover hole 29 may be formed in the shielding cover 28 covering the panel opening part 23 of the rear panel 20. The cover hole 29 may be in a form that penetrates the shielding cover 28. External air can flow into the inside of the heating device 100, that is, the combustion chamber S5, through the cover hole 29.

[0294] Referring to Figure 25 , the combustion chamber S5 is provided in front of the cover hole 29. Since the cover hole 29 is connected to the chamber opening part 118, the cover hole 29 can allow external air to lead to the combustion chamber S5. Thus, a part of the air flowing into the combustion chamber S5 through the cover hole 29 can be supplied to the burner 120 to become secondary air. In addition, a part of the inflowing air can be transmitted to the second cooling flow path CP2 for cooling components. Therefore, it can also be regarded that the cover hole 29 constitutes a part of the second intake part IP2. Of course, a part of the air flowing into the combustion chamber S5 through the cover hole 29 can also be used as primary air.

[0295] The cover hole 29 may have an elongated hole shape arranged along the length direction of the shielding cover 28, that is, in a direction parallel to the extending direction of the burner 120. A plurality of the cover holes 29 may also be arranged on the shielding cover 28 at a fixed interval. Thus, the external air flowing into the cover hole 29 formed along the extending direction of the burner 120 can be evenly supplied to the flame holes 125 of the burner 120.

[0296] Figure 26The structure of the heating device 100 constituting the third embodiment of the present invention is shown in a cross-sectional view. The parts different from the previously described embodiments will be described. In the heating device 100, the flow path guide is not separately manufactured, and the flow path guide may be integrally formed in the burner housing 110. That is, in the burner housing 110 of the heating device 100, a flow path guide part (not assigned a reference numeral) forming the heating flow path GP is integrally formed. Thus, it is possible to combine without separately forming the flow path guide, and the combustion chamber S5 is partitioned by the integrally arranged flow path guide part.

[0297] Figures 27 to 30 The structure of the heating device 100 constituting the fourth embodiment of the present invention is shown. The parts different from the previously described embodiments will be described. In the heating device 100, a guide vane 145 for guiding the flame of the burner 120 may be arranged. The guide vane 145 may be integrally formed in 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 extending direction of the flame.

[0298] Refer to Figure 28 , the guide vane 145 may extend from the back surface part 135 of the guide of the flow path guide 130. The guide vane 145 may be arranged in a direction inclined downward from the lower end of the back surface part 135 of the guide toward the burner 120. The guide vane 145 may have a substantially plate-like structure. The guide vane 145 may extend in the same direction as the back surface part 135 of the guide. The guide vane 145 may have a length longer than or at least the same as the length of the region of the burner 120 where the flame holes 125 are arranged.

[0299] The end 145a of the guide vane 145 may extend to a position adjacent to the surface of the burner 120. The end 145a of the guide vane 145 may be separated from the surface of the burner 120 by a predetermined distance. Thus, air can flow into the gap separated from the surface of the burner 120 at the end 145a of the guide vane 145. External air can, after flowing into the combustion chamber S5, be transferred between the end 145a of the guide vane 145 and the surface of the burner 120. The air transferred in this way can be supplied to the flame holes 125 of the burner 120 and utilized as secondary air.

[0300] Refer to Figure 29, a heating flow path GP may be formed between the guide vane 145, the front surface portion 131 of the guide member, and the side surface portion 132 of the guide member. The air heated by the burner 120 may rise through the heating flow path GP. The guide vane 145 may also function to guide the heated air toward the heating flow path GP side. The guide vane 145 and the front surface portion 131 of the guide member form a heating flow path GP that is narrower in width as it approaches the upper part, so that the flow rate of the rising air can be increased.

[0301] Refer to Figure 30 , the flow of the air entering the heating flow path GP is indicated by arrow ①. The air that has passed through the heating flow path GP may enter the combustion chamber S5 (in the direction of arrow ①'). At the same time, the air for cooling may also flow along the surface of the flow path guide 130 (in the direction of arrow ②). The air may pass along the surface of the front surface portion 131 of the guide member to cool the flow path guide 130 and then move to the first cooling flow path CP1. In addition, a part of the external air may pass through the upper side of the guide vane 145 to cool the guide vane 145 (in the direction of arrow ③). The air that has cooled the guide vane 145 may also move to the second cooling flow path CP2.

[0302] Figures 31 to 33 shows the structure of the heating device 100 constituting the fifth embodiment of the present invention. Describing the parts different from the previously described embodiments, a guide vane 145 may be disposed between the burner 120 and the flow path guide 130 constituting the heating device 100. The guide vane 145 may be integrally formed with the flow path guide 130. The flow path guide 130 may not only guide the heated air to the heating chamber S2, but also guide the extending direction of the flame.

[0303] Refer to Figure 31 , the guide vane 145 may extend from the back surface portion 135 of the guide member of the flow path guide 130. The guide vane 145 may be disposed in a direction inclined downward from the lower end of the back surface portion 135 of the guide member toward the burner 120. The guide vane 145 may have a substantially plate-like structure. The guide vane 145 may extend in the same direction as the back surface portion 135 of the guide member. The guide vane 145 may have a length longer than or at least the same as the length of the region of the burner 120 where the flame holes 125 are disposed.

[0304] Refer to Figure 32, one end of the guide vane 145 can be connected to the back surface portion 135 of the guide member, 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 the guide member fastening portion 121b of the burner 120.

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

[0306] The guide vane 145 can be connected between the back surface portion 135 of the guide member and the burner 120, and the upper and lower portions can be demarcated with the guide vane 145 as a reference. Refer to Figure 31 , a space connected to the second cooling flow path CP2 can be formed in the upper portion of the guide vane 145. The lower portion of the guide vane 145 can be a space connected to the heating flow path GP.

[0307] Refer to Figure 32 , a heating flow path GP can be formed between the guide vane 145, the front surface portion 131 of the guide member, and the side surface portion 132 of the guide member. The 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 front surface portion 131 of the guide member can form a heating flow path GP that becomes narrower toward the upper portion, thereby accelerating the flow rate of the rising air.

[0308] Refer to Figure 33 , the flow of the air entering the heating flow path GP is indicated by arrow ①. The air that has passed through the heating flow path GP can enter the combustion chamber S5 (in the direction of arrow ①'). At the same time, the air for cooling can also flow along the surface of the flow path guide member 130 (arrow ② direction). The air can move to the first cooling flow path CP1 after cooling the flow path guide member 130 by passing along the surface of the front surface portion 131 of the guide member. In addition, a part of the external air can cool the guide vane 145 by passing through the upper side of 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.

[0309] Figure 34 and Figure 35The structure of the heating device 100 constituting the sixth embodiment of the present invention is shown. Differences from the previously described embodiments will be described. The heating device 100 may be configured with a flame guide 140. The flame guide 140 may be coupled to the surface of the burner 120. The flame guide 140 may guide the direction of the flame generated in the flame holes 125 of the burner 120.

[0310] The flame guide 140 may be configured with a fixed body 141 coupled to the burner 120. The fixed body 141 may have a curved surface shape corresponding to the surface of the burner 120. The fixed body 141 may be configured with a fastening hole 141a into which the guide fastening portion 121b of the burner 120 is inserted.

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

[0312] The guide vane 145 may be configured with air guide holes 148. The air guide holes 148 may be formed through the guide vane 145. The air guide holes 148 may form a path through which air passes. A part of the air moving along the upper part of the guide vane 145 may move downward, i.e., in the direction of the flame holes 125 of the burner 120, through the air guide holes 148. This air acts as secondary air, helps the combustion of the burner 120, and can prevent the flame from becoming too long.

[0313] The air guide holes 148 may be configured in plural. In this embodiment, the air guide holes 148 may be configured in a total of three rows along the length direction of the guide vane 145. The three rows of air guide holes 148 may be arranged at the same interval. Air can flow more smoothly into the front of the burner 120 through the plural vane holes.

[0314] Refer to Figure 35, a part of the air moving along the upper part of the guide blade 145 can move downward (in the direction of arrow ①) through the air guide hole 148. The air moving downward can be supplied to the front of the burner 120. The air supplied in this way can become secondary air for forming the flame. F in the figure represents the shape of the flame. The air passing through the air guide hole 148 can help the complete combustion of the mixed gas and guide the smooth generation of the flame. At the same time, the air flowing through the lower part of the burner 120 (in the direction of arrow ②) can also become secondary air and help the complete combustion of the mixed gas.

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

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

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

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

[0319] At this time, the distance between the end of the air guide 146, which is the free end of the cantilever, and the guide blade 145 can be maximized. That is, the air guide 146 can extend in a direction in which the end closer to the free end is farther away from the air guide hole 148. Thus, the air that collides with the air guide 146 can naturally move to the lower side of the air guide 146.

[0320] The lower side of the air guide 146 may be provided with air guide holes 148. The air guide holes 148 may also be regarded as the holes left after the air guide 146 is bent from the guide vane 145. The air guide holes 148 may form a path through which air passes. A part of the air moving along the upper part of the guide vane 145 may be blocked by the air guide 146 and guided to the air guide holes 148.

[0321] In this way, the air passing through the air guide holes 148 may move downward, that is, in the direction of the flame holes 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 overly long.

[0322] The air guide 146 and the air guide holes 148 may be configured in plural. In this embodiment, the air guide 146 and the air guide holes 148 may be arranged in three in total along the length direction of the guide vane 145 respectively. The plural air guides 146 and air guide holes 148 may be arranged at the same interval. Air may flow more smoothly into the front of the burner 120 through the plural air guide holes 148.

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

[0324] The above description only exemplarily illustrates the technical idea of the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and deformations without exceeding the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not used to limit the technical idea of the present invention but to illustrate. The scope of the technical idea of the present invention is not limited to such embodiments. The protection scope of the present invention should be interpreted by the claims and should be interpreted as including all the technical ideas within the equivalent scope in the claims of the present invention.

Claims

1. A cooking device, comprising: shell; A frame is disposed inside the housing and forms a cooking chamber; a circulation device, forming a circulation cavity communicating with the cooking chamber; as well as A heating device, formed with a combustion chamber connected to the circulation chamber and equipped with a burner, the burner heats the air flowing into the combustion chamber; The heating device is provided with a first air inlet portion open to the surface of the burner; A second air intake portion connected to the combustion chamber is arranged between the heating device and the housing.

2. The cooking device according to claim 1, wherein: The second air inlet portion is disposed such that the heating device and a surface of the housing facing the heating device are spaced apart from each other.

3. The cooking device according to claim 1, wherein: The heating device is arranged along a rear edge of the lower portion of the frame in a direction, and the second air inlet is arranged between the heating device and the housing in the direction.

4. The cooking device according to claim 1, wherein: The second air inlet portion is arranged in a direction parallel to a surface of the housing.

5. The cooking device according to claim 1, wherein: A connecting passage connecting the circulation chamber and the combustion chamber is open in the frame, and the second air inlet portion is configured to be closer to the housing than the connecting passage.

6. The cooking device according to claim 1, wherein: An air inflow channel for air flow is formed at the lower portion of the heating device, and the second air inlet portion is arranged at an end position of the air inflow channel.

7. The cooking device according to claim 1, wherein: A back panel constituting the housing is disposed on the side opposite to the inlet of the cooking chamber, and the second air intake portion is disposed by separating the heating device and the back panel from each other.

8. The cooking device according to claim 1, wherein: A setting space is arranged between the shell and the frame, and the heating device is arranged in the setting space; The housing is provided with a panel opening portion that opens the installation space, and the second air intake portion is connected to the panel opening portion.

9. The cooking device according to claim 8, wherein: The housing is provided with a panel opening portion that opens the installation space to the outside of the housing, the panel opening portion is shielded by a shielding cover, and a cover hole connected to the second air inlet portion is opened in the shielding cover.

10. The cooking device according to claim 1, wherein The connecting channel connecting the circulation chamber and the combustion chamber is open in the frame, a flame guide is arranged between the burner and the connecting channel, and the second air inlet portion and the upper space of the flame guide form a flow path connected to each other.

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