Air fryer with optimized structure

Abstract

The air fryer comprises a machine shell and a fryer assembly, the machine shell is provided with an assembly cavity with a lateral opening, the fryer assembly enters and exits the assembly cavity through the opening, a metal bottom plate is arranged at the bottom of the assembly cavity, a base is formed at the bottom of the machine shell, and a heat insulation cavity is formed between the base and the metal bottom plate. A heating piece is arranged on the lower surface of the metal bottom plate, a concave groove and a convex boss are arranged on the bottom wall of the base, the concave groove and the convex boss are arranged at intervals, a first air hole communicated with the atmosphere is formed in the bottom of the groove, a second air hole communicated with the atmosphere is formed in the top of the boss, and the second air hole is higher than the first air hole. The base is provided with the two kinds of air holes with different heights, external airflow enters the heat insulation cavity from the lower first air hole at a high temperature, enters the heat insulation cavity from the higher second air hole at a low temperature, forms a temperature difference, forms convection between the two air holes, can accelerate airflow circulation in the heat insulation cavity, and improves the heat dissipation efficiency.

Description

Technical Field

[0001] The utility model relates to the field of air fryers, and in particular to an air fryer with an optimized structure. Background Art

[0002] To improve the uniformity of heating the upper and lower surfaces of food, some existing air fryers also have a heating device installed at the bottom of the assembly chamber. This allows the ingredients to be heated simultaneously from both upper and lower heat sources, resulting in more even coloring and a better taste. Existing bottom heating structures include aluminum die-cast heating plates, electric heating tubes, and PTC heating elements. These bottom heating structures are usually located close to the bottom of the casing, making the plastic bottom of the casing susceptible to deformation due to heat. While adding a high-temperature resistant insulation layer to the inner layer of the casing can solve the problem of bottom deformation due to heat, it also increases the cost.

[0003] To ensure effective bottom heating while preventing heat deformation or melting of the housing, existing patent CN218246783U discloses a frying pan, including an electric heating base and a frying pan. The base's bottom recess, which houses the frying pan, is equipped with a heating assembly for heating the pan. The base also features several heat dissipation holes at its lower end, dissipating heat and preventing thermal deformation. This design utilizes multiple heat dissipation holes located at the same height on a raised portion of the base. However, the holes are too close to the tabletop on which the pan is placed, resulting in poor ventilation and low heat dissipation efficiency. Utility Model Content

[0004] The utility model provides an air fryer with optimized structure, aiming to solve the problem that the existing air fryer with a bottom heating structure under the pot body is provided with only heat dissipation holes of one height at the bottom of the casing, and the heat dissipation holes are too close to the table top, resulting in poor ventilation, low heat dissipation efficiency and poor heat dissipation.

[0005] The utility model discloses an air fryer with an optimized structure, comprising a casing and a fryer assembly, the casing having an assembly cavity with a side opening, the fryer assembly entering and exiting the assembly cavity through the opening, a metal bottom plate being provided at the bottom of the assembly cavity, a base being formed at the bottom of the casing, a heat-insulating cavity being formed between the base and the metal bottom plate, a heating element being provided on the lower surface of the metal bottom plate, a bottom wall of the base being provided with a concave groove and an upwardly convex boss being provided at intervals from the groove, a first air vent being provided at the bottom of the groove for communication with the atmosphere, a second air vent being provided at the top of the boss for communication with the atmosphere, and the second air vent being provided higher than the first air vent.

[0006] The structurally optimized air fryer of the present invention also has the following additional technical features:

[0007] The projection of the heating element on the base completely falls into the groove.

[0008] There are a plurality of bosses, and the bosses are arranged around the periphery of the groove at intervals.

[0009] The boss has a boss top wall and a boss side wall, and the second air vent portion passes through the boss top wall and the boss side wall.

[0010] The size of the second air vent is larger than that of the first air vent.

[0011] The first ventilation holes and the second ventilation holes are both strip-shaped, and at least part of the second ventilation holes extends in the same direction as the first ventilation holes.

[0012] The outer side cover of the heating element is provided with a heat insulation cover.

[0013] A supporting foot is provided at the bottom of the base, and a gap of not less than 3 mm is formed between the bottom end of the groove and the bottom end of the supporting foot.

[0014] The heating element is fixed to the metal base plate by screwing or riveting.

[0015] Adjacent bosses are connected via at least two spaced heat sinks, which extend vertically upward from the bottom wall of the base.

[0016] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0017] 1. The air fryer with optimized structure of the present invention is provided with two air holes of different heights on the base. During the operation of the machine, the external air first enters the insulation cavity from the lower first air hole with high temperature, and then enters the insulation cavity from the higher second air hole with low temperature, forming a temperature difference. Convection is formed between the two, which can accelerate the air circulation in the insulation cavity, thereby driving more air flow into the insulation cavity and improving heat dissipation efficiency.

[0018] 2. Under the premise of ensuring the bottom heating effect, in order to reduce the influence of the high temperature of the heating element on the base, the projection of the heating element on the base falls completely into the groove, so that the base facing the heating element is farther away from the heating element, which can reduce the probability of the base being deformed or melted by heat, protect the base, and omit the need to set a heat insulating member between the heating element and the base, thereby saving costs; furthermore, the heating element is set facing the groove, which can make the temperature at the first air vent higher, and form a larger temperature difference between the air vents at different heights, which is conducive to strengthening the convection between the air vents and improving the heat dissipation efficiency.

[0019] 3. In order to further improve the convection effect, multiple bosses can be set on the periphery of the groove to form a surrounding groove arrangement, which is conducive to forming annular convection, accelerating the heat dissipation of the base, and promoting the uniformity of the heat dissipation of the base.

[0020] 4. As for the second ventilation holes, under the premise of meeting the heat dissipation requirements, in order to prevent the second ventilation holes from being too large, which may easily allow mosquitoes and other insects to enter the insulation cavity through the second ventilation holes, affecting the hygiene in the insulation cavity, or blocking part of the ventilation holes and affecting the heat dissipation effect, the second ventilation holes can be set partially through the top wall and the side walls of the boss. On the one hand, the size of the opening can be limited, and on the other hand, the direction of the opening can be tilted to the side. Compared with the method of opening the holes upward, it is more difficult for insects such as cockroaches to enter the insulation cavity, thereby providing effective insect protection.

[0021] 5. Since the first air vent is arranged on the bottom wall of the groove and the opening faces upward, if the opening is large, it will be easy for cockroaches and other insects to enter the insulation cavity through the first air vent. In order to avoid this situation, the size of the first air vent can be relatively small, and at the same time, in order to ensure the heat dissipation effect, the size of the second air vent can be relatively large.

[0022] 6. The present application may adopt strip-shaped air holes, which have high heat dissipation efficiency compared to common circular heat dissipation holes, and are conducive to rapid heat dissipation of the base; by making at least part of the second air holes extend in the same direction as the first air holes, the base can form a larger heat dissipation area in the length or width direction, which can improve the uniformity of heat dissipation of the base.

[0023] 7. In order to reduce the impact of the heat of the heating element on the base, and prevent the airflow in the insulation cavity from causing heat loss of the heating element and affecting the heating effect of the heating element on the bottom of the pot body, the outer cover of the heating element is provided with a heat insulation cover. The heat insulation cover forms a physical isolation, which can prevent the heat of the heating element from being transferred to the base, which is beneficial to extending the service life of the base. In addition, the heat insulation cover can reduce the heat loss of the heating element, allowing the heat to fully heat the food in the pot body, thereby improving food processing efficiency.

[0024] 8. When the air fryer is placed on a table, it can be supported by the feet at the bottom of the base. A gap of no less than 3mm is formed between the bottom end of the groove and the bottom end of the foot. This can prevent the first air vent from being too close to the table, resulting in poor ventilation. That is, the setting of the gap is conducive to the entry of cold air into the insulation cavity from the bottom and the discharge of heat, thereby improving the heat dissipation efficiency.

[0025] 9. When there are multiple bosses, adjacent bosses are connected by at least two spaced heat sinks, which extend vertically upward from the bottom wall of the base. The provision of the heat sinks can accelerate the heat dissipation at the bosses, prevent the bosses from overheating and melting, and further improve the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the composition structure of an air fryer under one embodiment of the present application.

[0028] Figure 2 for Figure 1 A schematic structural diagram of a casing with an assembly cavity is shown in FIG.

[0029] Figure 3 This is a schematic cross-sectional view of an air fryer according to one embodiment of the present application.

[0030] Figure 4 This is a structural schematic diagram of a base under one embodiment of the present application.

[0031] Figure 5 for Figure 4 A magnified schematic diagram of the structure at center A.

[0032] Figure 6 This is a schematic diagram of the arrangement of the heating element in one embodiment of the present application.

[0033] Figure 7 This is a schematic diagram of a heating element fixed on a metal base plate according to an embodiment of the present application.

[0034] Figure 8 This is a schematic diagram of the distribution of the base legs and grooves in one embodiment of the present application.

[0035] Reference numerals:

[0036] 10. Casing; 11. Assembly cavity; 12. Fryer assembly; 13. Metal bottom plate; 131. Mounting hole; 14. Base; 15. Insulation cavity; 16. Heating element; 161. Through hole; 162. Heating element; 163. Wiring harness; 17. Groove; 18. Boss; 181. Boss top wall; 182. Boss side wall; 19. First air vent; 20. Second air vent; 21. Fastener; 22. Heat sink; 23. Support leg; 24. Heat fan; 25. Heating tube. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in combination with the accompanying drawings by way of examples.

[0038] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0039] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0040] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0042] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or an interaction between two components. However, the phrase "direct connection" indicates that the two connected entities are not connected through a transition structure, but are connected solely through a connecting structure to form a single entity. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0044] like Figures 1 to 8 As shown, the present application provides an air fryer with an optimized structure, including a casing 10 and a fryer assembly 12. The casing 10 has an assembly cavity 11 with a side opening, and the fryer assembly 12 enters and exits the assembly cavity 11 through the opening. A hot fan 24 and a heating tube 25 are provided at the upper end of the assembly cavity 11, and a metal bottom plate 13 is provided at the bottom of the assembly cavity 11. A base 14 is formed at the bottom of the casing 10, and an insulating cavity 15 is formed between the base 14 and the metal bottom plate 13. A heating element 16 is provided on the lower surface of the metal bottom plate 13. When the air fryer is working, the hot air generated by the hot fan 24 and the heating tube 25 blows downward into the pot body to heat the food. The heat of the heating element 16 is transmitted into the pot body through the metal bottom plate 13 and the bottom of the pot body to heat the food, forming upper and lower dual heat source heating, which is beneficial to uniform heating of the upper and lower surfaces of the food, achieving the effect of not having to turn over, and can improve the color and taste of the food. By providing the heat-insulating cavity 15 , a certain distance can be formed between the heating element 16 and the base 14 , which can reduce the impact of the heat of the heating element 16 on the plastic base 14 , thereby reducing the probability of thermal deformation or melting of the base 14 and extending the service life of the base 14 .

[0045] The bottom wall of the base 14 is provided with a concave groove 17 and an upward convex boss 18 spaced apart from the groove 17. The bottom of the groove 17 is provided with a first air vent 19 connected to the atmosphere, and the top of the boss 18 is provided with a second air vent 20 connected to the atmosphere. The second air vent 20 is arranged higher than the first air vent 19.

[0046] By setting two air holes of different heights on the base 14, during the operation of the machine, the external air flow first enters the insulation cavity 15 from the lower first air hole 19, where the temperature is high, and then enters the insulation cavity 15 from the higher second air hole 20, where the temperature is low, forming a temperature difference. Convection is formed between the two, which can accelerate the air flow circulation in the insulation cavity 15, thereby driving more air flow into the insulation cavity 15 and improving the heat dissipation efficiency.

[0047] like Figure 4As shown, the first air vent 19 is provided on the bottom wall of the groove 17, and the second air vent 20 is provided on the top wall of the boss 18 or partially penetrates the top wall and side walls of the boss 18, forming a high-low distribution of heat dissipation holes. By creating convection between the air vents at different heights, compared to existing heat dissipation holes at a single height, the heat dissipation efficiency and effect can be effectively improved. Preferably, the groove 17 and the boss 18 are both integrally stamped from the base 14. The groove 17 is formed by partially concavely forming the base 14, and the boss 18 is formed by partially convexly forming the base 14. Compared to the existing technology, this does not increase the complexity of the structure and does not increase the cost.

[0048] The heating element 16 can adopt a heating tube, a PTC heating element and other structures. Preferably, the heating element 16 is a PTC heating element. The PTC heating element can realize its own temperature control and stable output power by utilizing the characteristic that the resistance of the PTC thermistor material increases with the increase of temperature. It has multiple functions such as heating, temperature control, overload protection and temperature compensation. By utilizing the characteristic that the power will be attenuated by dry burning of PTC, the appropriate model (dry burning power, upper limit of surface temperature) is selected to realize automatic protection, and there is no need to equip an additional thermostat / fuse to control / protect the bottom heating module. Preferably, a PTC with a dry burning power of 25 watts and a surface temperature upper limit of 150°C is selected, which can take into account the heating effect and will not melt the base 14. For the specific composition structure and working principle of PTC, please refer to the existing technology and will not be repeated here.

[0049] Furthermore, the PTC heating element can be fixed to the metal base plate 13 by screwing or riveting. The conventional screwing or riveting method has a simple structure and is firmly fixed. Figure 1 、 Figure 2 and Figure 7 As shown, the metal base plate 13 is provided with a mounting hole 131 , and the PTC heating element is provided with a through hole 161 corresponding to the mounting hole 131 , and the PTC heating element can be fixed by passing a fastener 21 (such as a screw).

[0050] Under the premise of ensuring the bottom heating effect, in order to reduce the influence of the high temperature of the heating element 16 on the base 14, as a preferred embodiment, the projection of the heating element 16 on the base 14 completely falls into the groove 17. Figure 3 and Figure 6As shown, the base 14 facing the heating element 16 can be placed farther away from the heating element 16, which can reduce the probability of the base 14 being deformed or melted by heat, protect the base 14, and omit the need for a heat insulating member between the heating element 16 and the base 14, thereby saving costs. Furthermore, the heating element 16 is placed facing the groove 17, which can increase the temperature at the first air hole 19 and create a greater temperature difference between air holes at different heights, thereby enhancing convection between the air holes and improving heat dissipation efficiency. When the heating element 16 is a PTC heating element, the PTC heating element includes a rectangular heating element 162, the area of ​​which is smaller than the area of ​​the bottom wall of the groove 17.

[0051] In order to further improve the convection effect, as a preferred embodiment, a plurality of bosses 18 are provided, and the plurality of bosses 18 are arranged around the periphery of the groove 17 at intervals. Figure 4 or Figure 6 As shown, bosses 18 are provided along the outer periphery of the groove 17 in four directions (front, back, left and right of the groove 17), and the bosses 18 in each direction are provided with second air holes 20, forming the second air holes 20 distributed around the first air holes 19, which is conducive to forming annular convection, accelerating the heat dissipation of the base 14, and promoting the uniformity of the heat dissipation of the base 14.

[0052] Furthermore, the first air holes 19 and the second air holes 20 are preferably strip-shaped holes, which have high heat dissipation efficiency compared to common circular heat dissipation holes, and are conducive to rapid heat dissipation of the base 14. Figure 4 As shown, the strip-shaped bosses 18 include two extension directions, wherein the extension direction of one group of relatively arranged bosses 18 and second air holes 20 is the same as the extension direction of the first air holes 19, so that the base 14 has a larger heat dissipation area in this extension direction, which can improve the uniformity of heat dissipation of the base 14; the extension direction of the other group of relatively arranged bosses 18 and second air holes 20 is perpendicular to the extension direction of the first air holes 19, so that all bosses 18 extend from a position close to the center of the base 14 toward the edge of the base 14, and the groove 17 is arranged in the central area of ​​the base 14, which is conducive to allowing the airflow to cover the center and edge areas of the base 14, thereby improving the uniformity of heat dissipation and avoiding local overheating of the base 14 and affecting its structural quality.

[0053] It is understandable that, in other embodiments, the first air holes 19 and the second air holes 20 may be holes of other shapes such as circular holes and square holes, and the first air holes 19 and the second air holes 20 may be holes of different shapes.

[0054] In one embodiment, adjacent bosses 18 are connected by at least two spaced heat sinks 22, and the heat sinks 22 extend vertically upward from the bottom wall of the base 14. Figure 4As shown, the provision of heat sinks 22 can accelerate heat dissipation at the bosses 18, prevent overheating and melting at the bosses 18, and further improve heat dissipation efficiency. Adjacent bosses 18 are connected by heat sinks 22, which can also serve as reinforcing ribs, further reducing the probability of deformation of the bosses 18.

[0055] As a preferred embodiment, the boss 18 has a boss top wall 181 and a boss side wall 182 , and the second vent hole 20 partially passes through the boss top wall 181 and the boss side wall 182 .

[0056] On the premise of meeting the heat dissipation requirements, in order to prevent the second air holes 20 from being too large, which may easily cause mosquitoes and the like to enter the insulation cavity 15 through the second air holes 20, affecting the hygiene in the insulation cavity 15, or blocking part of the air holes and affecting the heat dissipation effect, the second air holes 20 can be arranged to partially penetrate the boss top wall 181 and the boss side wall 182. On the one hand, the size of the opening can be limited, and on the other hand, the direction of the opening can be biased to the side. Compared with the method of opening the hole upward, it is more difficult for insects such as cockroaches to enter the insulation cavity 15, thereby providing effective insect protection.

[0057] like Figure 4 and Figure 5 As shown, the second vent holes 20 extend through half of the boss top wall 181 and partially through the boss side wall 182, facing diagonally upward. For bosses 18 on the same side of the groove 17, the second vent holes 20 may be oriented in one direction: toward the upper left or the upper right, or in two directions: toward the upper left and the upper right. The second vent holes 20 between the bosses 18 may be the same or different in size, depending on actual needs.

[0058] It is understandable that, in other embodiments, the second vent hole 20 may also be solely provided on the boss top wall 181 or the boss side wall 182 to simplify the processing of the structure.

[0059] As a preferred embodiment, the size of the second air vent 20 is larger than that of the first air vent 19. Since the first air vent 19 is located on the bottom wall of the groove 17 and faces upward, if the opening is too large, it will be easy for cockroaches and other insects to enter the insulation cavity 15 through the first air vent 19. To avoid this, the size of the first air vent 19 can be relatively small, while at the same time, to ensure the heat dissipation effect, the size of the second air vent 20 can be relatively large.

[0060] In order to reduce the impact of the heat of the heating element 16 on the base 14, and at the same time prevent the airflow in the insulation cavity 15 from causing heat loss of the heating element 16 and affecting the heating effect of the heating element 16 on the bottom of the pot body, as a preferred embodiment, the outer cover of the heating element 16 is provided with a heat insulation cover.

[0061] The heat insulation cover forms a physical isolation, which can prevent the heat of the heating element 16 from being transferred to the base 14, which is beneficial to extending the service life of the base 14. The heat insulation cover can also reduce the heat loss of the heating element 16, allowing the heat to fully heat the food in the pot, thereby improving food processing efficiency.

[0062] Specifically, the heat shield can be fixed to the lower surface of the metal base plate 13 and surround the heating element 16. An air isolation layer is formed between the heat shield and the base 14 to prevent the heat of the heating element 16 from being indirectly transferred to the base 14 through the heat shield, which is beneficial to reducing the temperature of the base 14. When the heating element 16 is a PTC heating element, such as Figure 7 As shown, the PTC heating element includes a heating body 162 and a wiring harness 163 connected to the heating body 162. The side wall of the heat insulation cover is provided with a wire hole for the wiring harness 163 to pass through, so that the PTC heating element can be connected to ensure that it can be powered on and work.

[0063] It is understandable that when the heating element 16 is arranged opposite to the groove 17, a larger distance is formed between the heating element 16 and the groove 17. By setting a suitable distance, the base 14 can be protected from thermal deformation without the heat shield.

[0064] As a preferred embodiment, a support leg 23 is provided at the bottom of the base 14 , and a gap of not less than 3 mm is formed between the bottom end of the groove 17 and the bottom end of the support leg 23 .

[0065] like Figure 8 As shown, when the air fryer is placed on a table, it can be supported by the support legs 23 at the bottom of the base 14. A gap H of at least 3 mm is formed between the bottom end of the groove 17 and the bottom end of the support legs 23. This prevents the first air vent 19 from being too close to the table, resulting in poor ventilation. In other words, the provision of the gap H facilitates the entry of cold air into the insulation cavity 15 from the bottom and the discharge of heat, thereby improving heat dissipation efficiency. Preferably, the support legs 23 can be made of silicone or have a silicone sleeve on the outside of the support legs 23 to reduce wear on the tabletop and isolate some heat, preventing heat from being transferred to the tabletop and damaging it.

[0066] The technical solutions protected by this utility model are not limited to the above-described embodiments. It should be noted that the combination of the technical solutions of any one embodiment with the technical solutions of one or more other embodiments falls within the scope of protection of this utility model. Although the above description of this utility model has been provided in detail using general instructions and specific embodiments, it is obvious to those skilled in the art that modifications or improvements can be made based on this utility model. Therefore, such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. An air fryer with an optimized structure, comprising a housing and a fryer assembly, wherein the housing has an assembly cavity with a side opening, the fryer assembly enters and exits the assembly cavity through the opening, a metal bottom plate is provided at the bottom of the assembly cavity, a base is formed at the bottom of the housing, an insulating cavity is formed between the base and the metal bottom plate, and a heating element is provided on the lower surface of the metal bottom plate, characterized in that: The bottom wall of the base is provided with a concave groove and a convex boss spaced apart from the groove. The bottom of the groove is provided with a first air vent connected to the atmosphere. The top of the boss is provided with a second air vent connected to the atmosphere. The second air vent is provided higher than the first air vent.

2. The air fryer with optimized structure according to claim 1, characterized in that: The projection of the heating element on the base completely falls into the groove.

3. The air fryer with optimized structure according to claim 1, characterized in that: There are a plurality of bosses, and the bosses are arranged around the periphery of the groove at intervals.

4. The air fryer with optimized structure according to claim 1, characterized in that: The boss has a boss top wall and a boss side wall, and the second air vent portion passes through the boss top wall and the boss side wall.

5. The air fryer with optimized structure according to claim 1, characterized in that: The size of the second air vent is larger than that of the first air vent.

6. The air fryer with optimized structure according to claim 1, characterized in that: The first ventilation holes and the second ventilation holes are both strip-shaped, and at least part of the second ventilation holes extends in the same direction as the first ventilation holes.

7. The air fryer with optimized structure according to claim 1, characterized in that: The outer side cover of the heating element is provided with a heat insulation cover.

8. The air fryer with optimized structure according to claim 1, characterized in that: A supporting foot is provided at the bottom of the base, and a gap of not less than 3 mm is formed between the bottom end of the groove and the bottom end of the supporting foot.

9. The air fryer with optimized structure according to claim 1, characterized in that: The heating element is fixed to the metal base plate by screwing or riveting.

10. The air fryer with optimized structure according to claim 3, characterized in that: Adjacent bosses are connected via at least two spaced heat sinks, which extend vertically upward from the bottom wall of the base.

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