Heat dissipation air duct structure and cooking electric appliance

Abstract

The utility model belongs to the technical field of cooking electric appliances, and discloses a heat dissipation air duct structure and a cooking electric appliance, the heat dissipation air duct structure comprises an air duct shell with a heat dissipation air duct, an air inlet of the heat dissipation air duct is communicated with an inner container, an air outlet is communicated with an external space, and hot air can enter the heat dissipation air duct from the inner container and is discharged; the air duct shell is formed by a plurality of shell plates in a surrounding mode, at least one shell plate is provided with an air opening adjusting piece, the air opening adjusting piece is arranged at the end, located at the air outlet, of the shell plate, the air opening adjusting piece can be bent so that the tail end can extend in the direction away from the heat dissipation air duct to adjust the area of the air outlet, and the bending curvature of the air opening adjusting piece can be changed. According to the heat dissipation air duct structure, the effect of automatically reducing the temperature of the inner container can be achieved, the air outlet with the variable area slightly changes the flow speed of hot air at the low temperature, and the cooling efficiency is guaranteed; at high temperature, the flow rate of hot gas is reduced to avoid gushing, users are prevented from being scalded, potential safety hazards of the cooking appliance are reduced, and the use experience of the users is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooking appliances, in particular to a heat dissipation duct structure and a cooking appliance. Background Art

[0002] An oven is an appliance with a closed cavity that uses high-temperature gas to bake food or dry objects. The oven's baking effect is significantly affected by the temperature within the cavity. Most ovens on the market typically cannot actively cool down the oven when the cavity temperature is high. Users are required to manipulate the control interface or open the oven door in response to a beep to actively dissipate heat. This requires users to wait a long time before continuing to use the oven, resulting in a poor user experience. Some ovens also cool down the oven by providing an air duct outside the cavity to exhaust the hot air inside. However, as cooking time increases, the temperature of the exhaust gas gradually increases. This large amount of hot air not only results in a poor user experience, but also poses a safety risk by scalding the user due to the high exhaust gas temperature.

[0003] Therefore, there is an urgent need for a heat dissipation duct structure and a cooking appliance to solve the above problems. Utility Model Content

[0004] One purpose of the present utility model is to provide a heat dissipation duct structure, which can solve the problems that some existing ovens need to open the oven door to dissipate heat, which takes a long time for users to wait and has a poor user experience; or some ovens discharge high-temperature hot air through the duct, which can easily burn users and pose a safety hazard.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A heat dissipation duct structure is provided, which is arranged on the outside of an inner liner, and hot gas is contained in the inner liner. The heat dissipation duct structure includes an air duct shell, and a heat dissipation duct is provided in the air duct shell. The air inlet of the heat dissipation duct is connected to the inner liner, and the air outlet is connected to the external space. The hot gas can enter the heat dissipation duct from the inner liner and be discharged; the air duct shell is formed by a plurality of shell plates arranged together, and at least one of the shell plates has an air outlet adjustment member, and the air outlet adjustment member is arranged on one end of the shell plate located at the air outlet. The air outlet adjustment member can be bent so that the end extends in a direction away from the heat dissipation duct to adjust the area of the air outlet, and the bending curvature of the air outlet adjustment member is variable.

[0007] In one embodiment, the air outlet adjustment member includes multiple adjustment plates stacked in the thickness direction of the shell plate, and the two adjacent layers of the adjustment plates are connected to each other. From the heat dissipation duct to the outside, the thermal expansion coefficients of the multiple layers of the adjustment plates decrease successively. When the hot gas flows through the air outlet adjustment member, the deformation of the inner layer of the adjustment plate is greater than the deformation of the outer layer of the adjustment plate, so that the end of the air outlet adjustment member bends toward the side of the outer layer of the adjustment plate.

[0008] In one embodiment, a thermal insulation cotton cover is provided around the outer side of the inner liner, and the air duct shell includes a top plate and two side plates, the top plate and the thermal insulation cotton cover are arranged opposite to each other, the top plate, the two side plates and part of the thermal insulation cotton cover are arranged to form the heat dissipation air duct, and the air outlet adjustment member is arranged on the top plate.

[0009] In one embodiment, the heat dissipation duct structure further includes a fan, which is disposed in the heat dissipation duct and is used to blow the hot gas in the heat dissipation duct.

[0010] In one embodiment, the fan is a variable speed fan, and the fan has a first working state and a second working state. The speed of the fan in the first working state is less than the speed of the fan in the second working state. When the temperature inside the inner tank is higher than the preset working temperature, the fan is converted from the first working state to the second working state.

[0011] In one embodiment, the heat dissipation duct structure further includes a temperature measuring component, which is communicatively connected to the fan and is used to detect the temperature inside the inner tank.

[0012] In one embodiment, the heat dissipation air duct structure further includes a guide pipe, the inner tank is provided with an air outlet, one end of the guide pipe is connected to the air outlet, and the other end is connected to the heat dissipation air duct.

[0013] In one embodiment, the inner liner has an upper side plate, a thermal insulation cotton cover is provided around the outer side of the upper side plate, the air duct shell is arranged above the thermal insulation cotton cover, the air outlet is opened at the center of the upper side plate, and the guide pipe vertically penetrates the thermal insulation cotton layer between the thermal insulation cotton cover and the upper side plate to connect the air duct shell.

[0014] In one embodiment, the heat dissipation duct structure also includes a driving member, the air outlet adjustment member is a deformable metal plate, one end of the deformable metal plate is connected to the air duct housing, and the free end of the deformable metal plate is connected to the output end of the driving member. The driving member is used to drive the free end to move in a direction away from the heat dissipation duct so that the air outlet adjustment member can bend, and the driving stroke of the driving member is variable.

[0015] Another object of the present invention is to provide a cooking appliance having a heat dissipation duct structure that can solve the problems that some existing ovens require opening the oven door to dissipate heat, which results in long waiting times for users and a poor user experience; or that some ovens discharge high-temperature hot air through the duct, which can easily scald users and pose a safety hazard.

[0016] To achieve this purpose, the present invention adopts the following technical solutions on the other hand:

[0017] A cooking appliance is provided, comprising the heat dissipation duct structure as described above. The cooking appliance further comprises an inner pot containing hot gas, and the heat dissipation duct structure is capable of discharging the hot gas in the inner pot.

[0018] Beneficial effects of the utility model:

[0019] The heat dissipation duct structure provided by the present invention has a heat dissipation duct within its duct housing. The air inlet of the heat dissipation duct is connected to the inner container, and the air outlet is connected to the external space. Hot gas can enter the heat dissipation duct from the inner container and be discharged, thereby reducing the temperature of the inner container. The hot gas is discharged during the cooking process, without the user having to manually open the door that seals the inner container or waiting time, thereby improving cooking efficiency and cooking taste. The duct housing is formed by a plurality of shell plates arranged one above the other. At least one of the shell plates has an air outlet adjustment member. The air outlet adjustment member is arranged on one end of the shell plate located at the air outlet. The air outlet adjustment member can be bent so that the end extends away from the heat dissipation duct. The curved air outlet adjustment member expands the area of the air outlet. When hot gas flows through the expanded air outlet, the flow rate correspondingly decreases, thereby reducing the amount of hot gas flowing out of the air outlet per unit time. Moreover, the curvature of the air outlet adjustment member is variable. The curvature of the air outlet adjustment member is positively correlated with the area of the air outlet. That is, as the curvature of the air outlet adjustment member increases, the area of the air outlet also increases accordingly. Therefore, when the hot gas temperature is low, the curvature can be reduced, and the increased area of the air outlet can be correspondingly reduced, allowing the hot gas to be discharged at a slightly slower rate. As the cooking time increases and the hot gas temperature rises significantly, the curvature can be increased, and the air outlet adjustment member can be bent more deeply, moving the end further away from the heat dissipation duct. The increased area of the air outlet is also correspondingly larger, further reducing the flow rate of the hot gas and discharging it at a slower rate. This variable-area air outlet has a minimal effect on the flow rate of the hot gas at low temperatures, ensuring efficient cooling. At high temperatures, the reduced flow rate of the hot gas prevents a large outflow, preventing burns to the user.

[0020] The cooking appliance provided by the present invention includes the aforementioned heat dissipation duct structure, which is capable of discharging hot air from an inner pot. This heat dissipation duct structure allows the hot air from the inner pot to be discharged through the heat dissipation duct structure, eliminating the need for manual operation or waiting time, thereby improving cooking efficiency and the cooking taste. The air outlet adjustment member of the air outlet housing can be curved to increase the area of the air outlet, and the curvature of the air outlet adjustment member can be varied. This prevents a large amount of hot air from flowing out of the air outlet per unit time when the temperature inside the inner pot is high, thereby preventing burns to the user, reducing safety hazards, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a cooking appliance provided by an embodiment of the present utility model;

[0022] Figure 2 This is a structural cross-sectional view of a cooking appliance provided by an embodiment of the present utility model at one viewing angle;

[0023] Figure 3 This is a structural cross-sectional view of the cooking appliance provided by an embodiment of the present utility model from another perspective;

[0024] Figure 4 yes Figure 3 A partial enlarged schematic diagram of part A;

[0025] Figure 5 It is a curved schematic diagram of the air outlet adjustment member provided in the first embodiment of the present invention.

[0026] In the picture:

[0027] 1. Air duct housing; 10. Cooling duct; 11. Air outlet adjustment member; 111. Adjustment plate; 12. Top plate; 13. Side plate; 14. Air outlet; 2. Fan; 3. Guide pipe;

[0028] 100. Inner liner; 101. Insulation cotton cover; 102. Upper side panel; 200. Door. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0030] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0033] Example 1

[0034] like Figures 1 to 5As shown, this embodiment first provides a heat dissipation duct structure. The heat dissipation duct structure is disposed outside an inner liner 100. Inner liner 100 contains hot gas, which is used to cook food. The heat dissipation duct structure includes an air duct housing 1, which contains a heat dissipation duct 10. The air inlet of heat dissipation duct 10 communicates with inner liner 100, and the air outlet 14 communicates with the outside space. Hot gas can enter heat dissipation duct 10 from inner liner 100 and be discharged, thereby reducing the temperature of inner liner 100. The hot gas is discharged during the cooking process, eliminating the need for the user to manually open door 200 enclosing inner liner 100 or wait time, thereby improving cooking efficiency and cooking taste. The air duct housing 1 is formed by a plurality of shell plates arranged around each other, at least one of which has an air outlet adjustment member 11. The air outlet adjustment member 11 is disposed on one end of the shell plate located at the air outlet 14. The air outlet adjustment member 11 can bend so that the distal end extends away from the heat dissipation duct 10. The curved air outlet adjustment member 11 expands the area of the air outlet 14. As hot gas flows through the expanded air outlet 14, the flow rate decreases accordingly, reducing the amount of hot gas flowing out of the air outlet 14 per unit time. Furthermore, the curvature of the air outlet adjustment member 11 is variable, and the curvature of the air outlet adjustment member 11 is positively correlated with the area of the air outlet 14. That is, as the curvature of the air outlet adjustment member 11 increases, the area of the air outlet 14 also increases accordingly. Therefore, when the temperature of the hot gas is low, the curvature can be reduced, and the increased area of the air outlet 14 is correspondingly smaller, allowing the hot gas to be discharged at a slightly slower rate. As the cooking time increases and the temperature of the hot gas rises significantly, the curvature can be increased, and the degree of curvature of the air outlet adjustment member 11 can be increased, thereby moving the end further away from the heat dissipation duct 10 and increasing the increased area of the air outlet 14 accordingly, further reducing the flow rate of the hot gas and discharging it at a slower rate. This variable-area air outlet 14 has a minimal effect on the flow rate of the hot gas at low temperatures, ensuring cooling efficiency. At high temperatures, the reduced flow rate of the hot gas prevents a large outflow, preventing burns to the user, reducing safety hazards, and improving the user experience.

[0035] Optionally, the tuyere regulating member 11 includes multiple layers of regulating plates 111 stacked along the thickness of the shell, with adjacent layers of regulating plates 111 interconnected. The thermal expansion coefficients of the multiple layers of regulating plates 111 decrease from the heat dissipation duct 10 outward. As hot gas flows through the tuyere regulating member 11, the thermal expansion coefficients of the multiple layers of regulating plates 111 decrease from the inside out, and the deformation of the multiple layers of regulating plates 111 also decreases, resulting in the deformation of the inner regulating plate 111 being greater than that of the outer regulating plate 111. The adjacent layers of regulating plates 111 are interconnected, generating internal stress between the outer regulating plate 111 with smaller deformation and the inner regulating plate 111 with larger deformation, causing the distal end of the tuyere regulating member 11 to bend toward the outer regulating plate 111. Moreover, as the temperature of the hot gas increases, the deformation of the tuyere regulating member 11 also increases accordingly, and the difference between the deformation of the inner regulating plate 111 and the deformation of the outer regulating plate 111 further increases, so that the curvature of the tuyere regulating member 11 increases, thereby increasing the area of the tuyere 14. Figure 4 As shown in the figure, when the air outlet adjustment member 11 includes two adjustment plates 111 stacked along the thickness direction of the shell plate, it bends due to thermal deformation, thereby expanding the area of the air outlet 14.

[0036] The adjustment plate 111 is preferably made of metal. Metal plates have a large thermal deformation coefficient and are easily deformed by heat. Furthermore, a wide range of metal materials are available, with varying thermal expansion coefficients. Furthermore, this thermoplastic deformation of the metal plate is reversible. As the temperature of the hot gas decreases, the curvature of the tuyere adjustment member 11 decreases until no more hot gas is discharged, and the tuyere adjustment member 11 returns to a planar structure.

[0037] In order to ensure the uniformity of the temperature of the inner liner 100, a heat-insulating cotton cover plate 101 is provided around the outer side of the inner liner 100, and heat-insulating cotton (not shown in the figure) is sandwiched between the heat-insulating cotton cover plate 101 and the inner liner 100. The air duct shell 1 includes a top plate 12 and two side plates 13. The top plate 12 and the heat-insulating cotton cover plate 101 are arranged relative to each other. The top plate 12, the two side plates 13 and part of the heat-insulating cotton cover plate 101 are arranged to form a heat dissipation air duct 10. The structure of the air duct shell 1 is simplified by using the heat-insulating cotton cover plate 101. The air duct shell 1 is usually a flat structure with a low height. The air outlet adjustment member 11 is arranged on the top plate 12, that is, the air outlet adjustment member 11 is located on the long side of the air outlet 14, which has a greater impact on the area of the air outlet 14. Figure 3 and Figure 4 As shown in the figure, H is the height of the air outlet 14. When the end of the air outlet adjustment member 11 bends toward a direction away from the heat dissipation duct 10, H will become larger, thereby achieving the effect of increasing the area of the air outlet 14.

[0038] In order to ensure that the hot gas in the inner liner 100 effectively enters the heat dissipation duct, the heat dissipation duct structure also includes a fan 2, which is arranged in the heat dissipation duct 10. The fan 2 is used to blow the hot gas in the heat dissipation duct 10 to generate a certain negative pressure in the heat dissipation duct 10, which is conducive to the hot gas in the inner liner 100 to continuously enter the heat dissipation duct 10, thereby improving the heat dissipation efficiency.

[0039] Optionally, fan 2 is a variable-speed fan having a first operating state and a second operating state. In the first operating state, the speed of fan 2 is lower than in the second operating state. When the temperature inside inner pot 100 exceeds a preset operating temperature, fan 2 switches from the first operating state to the second operating state. The preset operating temperature is set to maintain the temperature inside inner pot 100 within a certain range to ensure effective cooking. This embodiment does not limit the specific value of the preset operating temperature; it can be selected based on parameters such as the power of the cooking appliance.

[0040] The heat dissipation duct structure also includes a temperature sensor, which is communicatively connected to fan 2 and is used to detect the temperature within inner liner 100. When the temperature sensor detects that the temperature within inner liner 100 exceeds the preset operating temperature, it sends a communication signal to fan 2, causing fan 2 to increase its speed to switch to a second operating state, thereby accelerating the flow of hot gas from inner liner 100 into heat dissipation duct 10. The temperature sensor can be a high-temperature-resistant temperature sensor, such as a non-contact infrared temperature sensor. Its specific structure and temperature measurement principle can be configured with reference to existing technologies and are not described in detail in this embodiment.

[0041] The heat dissipation duct structure also includes a guide pipe 3, and the inner tank 100 is provided with an air outlet. One end of the guide pipe 3 is connected to the air outlet, and the other end is connected to the heat dissipation duct 10 to realize the transportation of hot gas and avoid the leakage of hot gas.

[0042] The liner 100 comprises an upper panel 102, with an insulation cover 101 positioned around the outside of the upper panel 102. The duct housing 1 is positioned above the insulation cover 101, with an air outlet located in the center of the upper panel 102, effectively utilizing the upward flow of hot gases. A guide tube 3 vertically penetrates the insulation layer between the insulation cover 101 and the upper panel 102 to connect to the duct housing 1. This shortens the guide tube 3 and prevents it from affecting the hot gas flow rate.

[0043] Example 2

[0044] The second embodiment of the present invention further provides a heat dissipation duct structure having an air duct housing 1 identical to that of the first embodiment. The air inlet of the heat dissipation duct 10 within the air duct housing 1 communicates with the inner liner 100, and the air outlet 14 communicates with the outside space. Hot air can enter the heat dissipation duct 10 from the inner liner 100 and be discharged, thereby reducing the temperature of the inner liner 100. The air duct housing 1 is formed by a plurality of shell plates arranged around each other. At least one of the shell plates has an air outlet adjustment member 11 disposed on one end of the shell plate located at the air outlet 14. The air outlet adjustment member 11 can be bent so that its distal end extends away from the heat dissipation duct 10.

[0045] The difference of this embodiment is that the heat dissipation duct structure also includes a driving member. The air outlet adjustment member 11 is a deformable metal plate. One end of the deformable metal plate is connected to the air duct housing 1. The free end of the deformable metal plate is connected to the output end of the driving member. The driving member is used to drive the free end to move away from the heat dissipation duct 10 so that the air outlet adjustment member 11 can bend, and the driving stroke of the driving member is variable. The driving member can be a push rod motor. The push rod of the push rod motor is connected to the end of the air outlet adjustment member 11. As the push rod extends, it pushes the end of the air outlet adjustment member 11 to move away from the heat dissipation duct 10, thereby causing the air outlet adjustment member 11 to bend and deform. As the push rod's extension stroke changes, the curvature of the air outlet adjustment member 11 changes, thereby changing the area of the air outlet 14.

[0046] In the second embodiment, the air outlet adjustment member 11 is bent and deformed by a driving member, and the deformation amount can be precisely controlled, so that the area change of the air outlet 14 can be adjusted steplessly.

[0047] Example 3

[0048] The present invention also provides a cooking appliance comprising a heat dissipation duct structure as described in the first or second embodiment, and an inner container 100 containing hot gas. The heat dissipation duct structure is capable of discharging the hot gas from the inner container 100. The hot gas from the inner container 100 can be discharged through the heat dissipation duct structure, eliminating the need for manual operation or waiting time by the user, thereby improving cooking efficiency and cooking taste. The air outlet adjustment member 11 of the air duct housing 1 is capable of bending to increase the area of the air outlet 14, and the curvature of the air outlet adjustment member 11 is variable, thereby preventing a large amount of hot gas from flowing out of the air outlet 14 per unit time when the temperature inside the inner container 100 is high, thereby preventing burns to the user, reducing safety hazards, and improving the user experience.

[0049] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A heat dissipation duct structure, arranged on the outside of an inner liner (100), wherein hot gas is contained in the inner liner (100), characterized in that: The heat dissipation duct structure comprises an air duct shell (1), wherein the air duct shell (1) has a heat dissipation duct (10), an air inlet of the heat dissipation duct (10) is connected to the inner liner (100), and an air outlet (14) is connected to the external space, and the hot gas can enter the heat dissipation duct (10) from the inner liner (100) and be discharged; the air duct shell (1) is formed by a plurality of shell plates arranged around each other, at least one of the shell plates has an air outlet adjustment member (11), and the air outlet adjustment member (11) is arranged on one end of the shell plate located at the air outlet (14), and the air outlet adjustment member (11) can be bent so that the end extends in a direction away from the heat dissipation duct (10) to adjust the area of the air outlet (14), and the bending curvature of the air outlet adjustment member (11) is variable.

2. The heat dissipation duct structure according to claim 1, characterized in that: The air outlet regulating member (11) comprises a plurality of regulating plates (111) stacked in a thickness direction of the shell plate, and two adjacent layers of the regulating plates (111) are connected to each other. From the heat dissipation air duct (10) to the outside, the thermal expansion coefficients of the plurality of regulating plates (111) decrease in sequence. When the hot gas flows through the air outlet regulating member (11), the deformation of the inner layer of the regulating plate (111) is greater than the deformation of the outer layer of the regulating plate (111), so that the end of the air outlet regulating member (11) bends toward the side of the outer layer of the regulating plate (111).

3. The heat dissipation duct structure according to claim 1, characterized in that: The outer side of the inner liner (100) is surrounded by a heat-insulating cotton cover plate (101); the air duct housing (1) comprises a top plate (12) and two side plates (13); the top plate (12) and the heat-insulating cotton cover plate (101) are arranged relative to each other; the top plate (12), the two side plates (13) and a part of the heat-insulating cotton cover plate (101) are arranged to form the heat dissipation air duct (10); and the air outlet adjustment member (11) is arranged on the top plate (12).

4. The heat dissipation duct structure according to claim 1, characterized in that: The heat dissipation duct structure further comprises a fan (2), which is arranged in the heat dissipation duct (10) and is used to blow the hot gas in the heat dissipation duct (10).

5. The heat dissipation duct structure according to claim 4, characterized in that: The fan (2) is a variable speed fan, and the fan (2) has a first working state and a second working state. In the first working state, the rotation speed of the fan (2) is less than the rotation speed of the fan (2) in the second working state. When the temperature in the inner tank (100) is higher than a preset working temperature, the fan (2) is converted from the first working state to the second working state.

6. The heat dissipation duct structure according to claim 5, characterized in that: The heat dissipation air duct structure further comprises a temperature measuring component, the temperature measuring component is communicatively connected to the fan (2), and the temperature measuring component is used to detect the temperature inside the inner tank (100).

7. The heat dissipation duct structure according to any one of claims 1 to 6, characterized in that: The heat dissipation air duct structure further comprises a guide pipe (3), the inner liner (100) is provided with an air outlet, one end of the guide pipe (3) is connected to the air outlet, and the other end is connected to the heat dissipation air duct (10).

8. The heat dissipation duct structure according to claim 7, characterized in that: The inner liner (100) has an upper side plate (102), and a heat-insulating cotton cover plate (101) is provided around the outer side of the upper side plate (102). The air duct shell (1) is arranged above the heat-insulating cotton cover plate (101), and the air outlet is opened at the center of the upper side plate (102). The guide pipe (3) vertically penetrates the heat-insulating cotton layer between the heat-insulating cotton cover plate (101) and the upper side plate (102) to connect with the air duct shell (1).

9. The heat dissipation duct structure according to claim 1, characterized in that: The heat dissipation duct structure further includes a driving member, the air outlet adjustment member (11) is a deformable metal plate, one end of the deformable metal plate is connected to the air duct housing (1), and the free end of the deformable metal plate is connected to the output end of the driving member, and the driving member is used to drive the free end to move in a direction away from the heat dissipation duct (10) so that the air outlet adjustment member (11) can bend, and the driving stroke of the driving member is variable.

10. A cooking appliance, characterized in that The cooking appliance comprises a heat dissipation duct structure according to any one of claims 1 to 9, wherein the cooking appliance further comprises an inner pot (100), wherein hot gas is contained in the inner pot (100), and the heat dissipation duct structure is capable of discharging the hot gas in the inner pot (100).

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